Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
f9ba5e22 | 5 | /* Copyright (c) University of Cambridge 1995 - 2018 */ |
059ec3d9 PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | /* Code for handling Access Control Lists (ACLs) */ | |
9 | ||
10 | #include "exim.h" | |
11 | ||
12 | ||
13 | /* Default callout timeout */ | |
14 | ||
15 | #define CALLOUT_TIMEOUT_DEFAULT 30 | |
16 | ||
17 | /* ACL verb codes - keep in step with the table of verbs that follows */ | |
18 | ||
19 | enum { ACL_ACCEPT, ACL_DEFER, ACL_DENY, ACL_DISCARD, ACL_DROP, ACL_REQUIRE, | |
20 | ACL_WARN }; | |
21 | ||
22 | /* ACL verbs */ | |
23 | ||
f9d04f08 | 24 | static uschar *verbs[] = { |
f2ed27cf JH |
25 | [ACL_ACCEPT] = US"accept", |
26 | [ACL_DEFER] = US"defer", | |
27 | [ACL_DENY] = US"deny", | |
28 | [ACL_DISCARD] = US"discard", | |
29 | [ACL_DROP] = US"drop", | |
30 | [ACL_REQUIRE] = US"require", | |
31 | [ACL_WARN] = US"warn" | |
32 | }; | |
059ec3d9 | 33 | |
4e88a19f PH |
34 | /* For each verb, the conditions for which "message" or "log_message" are used |
35 | are held as a bitmap. This is to avoid expanding the strings unnecessarily. For | |
36 | "accept", the FAIL case is used only after "endpass", but that is selected in | |
37 | the code. */ | |
38 | ||
39 | static int msgcond[] = { | |
e3a69b62 JH |
40 | [ACL_ACCEPT] = BIT(OK) | BIT(FAIL) | BIT(FAIL_DROP), |
41 | [ACL_DEFER] = BIT(OK), | |
42 | [ACL_DENY] = BIT(OK), | |
43 | [ACL_DISCARD] = BIT(OK) | BIT(FAIL) | BIT(FAIL_DROP), | |
44 | [ACL_DROP] = BIT(OK), | |
45 | [ACL_REQUIRE] = BIT(FAIL) | BIT(FAIL_DROP), | |
46 | [ACL_WARN] = BIT(OK) | |
4e88a19f | 47 | }; |
059ec3d9 PH |
48 | |
49 | /* ACL condition and modifier codes - keep in step with the table that | |
2d009132 | 50 | follows. |
71fafd95 | 51 | down. */ |
059ec3d9 | 52 | |
71fafd95 PH |
53 | enum { ACLC_ACL, |
54 | ACLC_ADD_HEADER, | |
55 | ACLC_AUTHENTICATED, | |
8523533c TK |
56 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
57 | ACLC_BMI_OPTIN, | |
58 | #endif | |
71fafd95 | 59 | ACLC_CONDITION, |
c3611384 | 60 | ACLC_CONTINUE, |
71fafd95 | 61 | ACLC_CONTROL, |
6a8f9482 TK |
62 | #ifdef EXPERIMENTAL_DCC |
63 | ACLC_DCC, | |
64 | #endif | |
8523533c TK |
65 | #ifdef WITH_CONTENT_SCAN |
66 | ACLC_DECODE, | |
67 | #endif | |
68 | ACLC_DELAY, | |
80a47a2c TK |
69 | #ifndef DISABLE_DKIM |
70 | ACLC_DKIM_SIGNER, | |
71 | ACLC_DKIM_STATUS, | |
4840604e | 72 | #endif |
1a2e76e1 | 73 | #ifdef SUPPORT_DMARC |
4840604e | 74 | ACLC_DMARC_STATUS, |
8e669ac1 | 75 | #endif |
71fafd95 PH |
76 | ACLC_DNSLISTS, |
77 | ACLC_DOMAINS, | |
78 | ACLC_ENCRYPTED, | |
79 | ACLC_ENDPASS, | |
80 | ACLC_HOSTS, | |
81 | ACLC_LOCAL_PARTS, | |
82 | ACLC_LOG_MESSAGE, | |
6ea85e9a | 83 | ACLC_LOG_REJECT_TARGET, |
71fafd95 | 84 | ACLC_LOGWRITE, |
8523533c TK |
85 | #ifdef WITH_CONTENT_SCAN |
86 | ACLC_MALWARE, | |
87 | #endif | |
88 | ACLC_MESSAGE, | |
89 | #ifdef WITH_CONTENT_SCAN | |
90 | ACLC_MIME_REGEX, | |
91 | #endif | |
b0b9dbb1 | 92 | ACLC_QUEUE, |
870f6ba8 | 93 | ACLC_RATELIMIT, |
8523533c TK |
94 | ACLC_RECIPIENTS, |
95 | #ifdef WITH_CONTENT_SCAN | |
96 | ACLC_REGEX, | |
97 | #endif | |
e7568d51 | 98 | ACLC_REMOVE_HEADER, |
71fafd95 PH |
99 | ACLC_SENDER_DOMAINS, |
100 | ACLC_SENDERS, | |
101 | ACLC_SET, | |
8523533c | 102 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 103 | ACLC_SPAM, |
8523533c | 104 | #endif |
7952eef9 | 105 | #ifdef SUPPORT_SPF |
8523533c | 106 | ACLC_SPF, |
65a7d8c3 | 107 | ACLC_SPF_GUESS, |
8523533c | 108 | #endif |
b0019c78 | 109 | ACLC_UDPSEND, |
8523533c | 110 | ACLC_VERIFY }; |
059ec3d9 | 111 | |
c3611384 | 112 | /* ACL conditions/modifiers: "delay", "control", "continue", "endpass", |
b0b9dbb1 | 113 | "message", "log_message", "log_reject_target", "logwrite", "queue" and "set" are |
c3611384 PH |
114 | modifiers that look like conditions but always return TRUE. They are used for |
115 | their side effects. */ | |
059ec3d9 | 116 | |
2d009132 JH |
117 | typedef struct condition_def { |
118 | uschar *name; | |
c5fcb476 | 119 | |
2d009132 | 120 | /* Flag to indicate the condition/modifier has a string expansion done |
059ec3d9 PH |
121 | at the outer level. In the other cases, expansion already occurs in the |
122 | checking functions. */ | |
2d009132 | 123 | BOOL expand_at_top:1; |
059ec3d9 | 124 | |
2d009132 | 125 | BOOL is_modifier:1; |
059ec3d9 | 126 | |
2d009132 JH |
127 | /* Bit map vector of which conditions and modifiers are not allowed at certain |
128 | times. For each condition and modifier, there's a bitmap of dis-allowed times. | |
129 | For some, it is easier to specify the negation of a small number of allowed | |
130 | times. */ | |
131 | unsigned forbids; | |
132 | ||
133 | } condition_def; | |
134 | ||
135 | static condition_def conditions[] = { | |
f2ed27cf | 136 | [ACLC_ACL] = { US"acl", FALSE, FALSE, 0 }, |
2d009132 | 137 | |
f2ed27cf JH |
138 | [ACLC_ADD_HEADER] = { US"add_header", TRUE, TRUE, |
139 | (unsigned int) | |
e3a69b62 JH |
140 | ~(ACL_BIT_MAIL | ACL_BIT_RCPT | |
141 | ACL_BIT_PREDATA | ACL_BIT_DATA | | |
2d009132 | 142 | #ifndef DISABLE_PRDR |
e3a69b62 | 143 | ACL_BIT_PRDR | |
2d009132 | 144 | #endif |
e3a69b62 JH |
145 | ACL_BIT_MIME | ACL_BIT_NOTSMTP | |
146 | ACL_BIT_DKIM | | |
147 | ACL_BIT_NOTSMTP_START), | |
2d009132 | 148 | }, |
059ec3d9 | 149 | |
f2ed27cf | 150 | [ACLC_AUTHENTICATED] = { US"authenticated", FALSE, FALSE, |
e3a69b62 JH |
151 | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START | |
152 | ACL_BIT_CONNECT | ACL_BIT_HELO, | |
2d009132 | 153 | }, |
8523533c | 154 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
f2ed27cf | 155 | [ACLC_BMI_OPTIN] = { US"bmi_optin", TRUE, TRUE, |
e3a69b62 JH |
156 | ACL_BIT_AUTH | |
157 | ACL_BIT_CONNECT | ACL_BIT_HELO | | |
158 | ACL_BIT_DATA | ACL_BIT_MIME | | |
2d009132 | 159 | # ifndef DISABLE_PRDR |
e3a69b62 | 160 | ACL_BIT_PRDR | |
2d009132 | 161 | # endif |
e3a69b62 JH |
162 | ACL_BIT_ETRN | ACL_BIT_EXPN | |
163 | ACL_BIT_MAILAUTH | | |
164 | ACL_BIT_MAIL | ACL_BIT_STARTTLS | | |
165 | ACL_BIT_VRFY | ACL_BIT_PREDATA | | |
166 | ACL_BIT_NOTSMTP_START, | |
2d009132 | 167 | }, |
8e669ac1 | 168 | #endif |
f2ed27cf JH |
169 | [ACLC_CONDITION] = { US"condition", TRUE, FALSE, 0 }, |
170 | [ACLC_CONTINUE] = { US"continue", TRUE, TRUE, 0 }, | |
2d009132 JH |
171 | |
172 | /* Certain types of control are always allowed, so we let it through | |
173 | always and check in the control processing itself. */ | |
f2ed27cf | 174 | [ACLC_CONTROL] = { US"control", TRUE, TRUE, 0 }, |
2d009132 | 175 | |
6a8f9482 | 176 | #ifdef EXPERIMENTAL_DCC |
f2ed27cf JH |
177 | [ACLC_DCC] = { US"dcc", TRUE, FALSE, |
178 | (unsigned int) | |
e3a69b62 | 179 | ~(ACL_BIT_DATA | |
2d009132 | 180 | # ifndef DISABLE_PRDR |
e3a69b62 | 181 | ACL_BIT_PRDR | |
2d009132 | 182 | # endif |
e3a69b62 | 183 | ACL_BIT_NOTSMTP), |
2d009132 | 184 | }, |
6a8f9482 | 185 | #endif |
8523533c | 186 | #ifdef WITH_CONTENT_SCAN |
e3a69b62 | 187 | [ACLC_DECODE] = { US"decode", TRUE, FALSE, (unsigned int) ~ACL_BIT_MIME }, |
2d009132 | 188 | |
8523533c | 189 | #endif |
e3a69b62 | 190 | [ACLC_DELAY] = { US"delay", TRUE, TRUE, ACL_BIT_NOTQUIT }, |
80a47a2c | 191 | #ifndef DISABLE_DKIM |
e3a69b62 JH |
192 | [ACLC_DKIM_SIGNER] = { US"dkim_signers", TRUE, FALSE, (unsigned int) ~ACL_BIT_DKIM }, |
193 | [ACLC_DKIM_STATUS] = { US"dkim_status", TRUE, FALSE, (unsigned int) ~ACL_BIT_DKIM }, | |
4840604e | 194 | #endif |
1a2e76e1 | 195 | #ifdef SUPPORT_DMARC |
e3a69b62 | 196 | [ACLC_DMARC_STATUS] = { US"dmarc_status", TRUE, FALSE, (unsigned int) ~ACL_BIT_DATA }, |
8523533c | 197 | #endif |
059ec3d9 | 198 | |
2d009132 JH |
199 | /* Explicit key lookups can be made in non-smtp ACLs so pass |
200 | always and check in the verify processing itself. */ | |
f2ed27cf | 201 | [ACLC_DNSLISTS] = { US"dnslists", TRUE, FALSE, 0 }, |
c3611384 | 202 | |
f2ed27cf JH |
203 | [ACLC_DOMAINS] = { US"domains", FALSE, FALSE, |
204 | (unsigned int) | |
e3a69b62 | 205 | ~(ACL_BIT_RCPT | ACL_BIT_VRFY |
2d009132 | 206 | #ifndef DISABLE_PRDR |
e3a69b62 | 207 | |ACL_BIT_PRDR |
2d009132 JH |
208 | #endif |
209 | ), | |
210 | }, | |
f2ed27cf | 211 | [ACLC_ENCRYPTED] = { US"encrypted", FALSE, FALSE, |
e3a69b62 JH |
212 | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START | |
213 | ACL_BIT_HELO, | |
2d009132 | 214 | }, |
8e669ac1 | 215 | |
f2ed27cf | 216 | [ACLC_ENDPASS] = { US"endpass", TRUE, TRUE, 0 }, |
8e669ac1 | 217 | |
f2ed27cf | 218 | [ACLC_HOSTS] = { US"hosts", FALSE, FALSE, |
e3a69b62 | 219 | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START, |
2d009132 | 220 | }, |
f2ed27cf JH |
221 | [ACLC_LOCAL_PARTS] = { US"local_parts", FALSE, FALSE, |
222 | (unsigned int) | |
e3a69b62 | 223 | ~(ACL_BIT_RCPT | ACL_BIT_VRFY |
f2ed27cf | 224 | #ifndef DISABLE_PRDR |
e3a69b62 | 225 | | ACL_BIT_PRDR |
f2ed27cf | 226 | #endif |
2d009132 JH |
227 | ), |
228 | }, | |
6a8f9482 | 229 | |
f2ed27cf | 230 | [ACLC_LOG_MESSAGE] = { US"log_message", TRUE, TRUE, 0 }, |
e3a69b62 | 231 | [ACLC_LOG_REJECT_TARGET] = { US"log_reject_target", TRUE, TRUE, 0 }, |
f2ed27cf | 232 | [ACLC_LOGWRITE] = { US"logwrite", TRUE, TRUE, 0 }, |
8523533c | 233 | |
2d009132 | 234 | #ifdef WITH_CONTENT_SCAN |
f2ed27cf JH |
235 | [ACLC_MALWARE] = { US"malware", TRUE, FALSE, |
236 | (unsigned int) | |
e3a69b62 | 237 | ~(ACL_BIT_DATA | |
2d009132 | 238 | # ifndef DISABLE_PRDR |
e3a69b62 | 239 | ACL_BIT_PRDR | |
2d009132 | 240 | # endif |
e3a69b62 | 241 | ACL_BIT_NOTSMTP), |
2d009132 JH |
242 | }, |
243 | #endif | |
8e669ac1 | 244 | |
f2ed27cf | 245 | [ACLC_MESSAGE] = { US"message", TRUE, TRUE, 0 }, |
2d009132 | 246 | #ifdef WITH_CONTENT_SCAN |
e3a69b62 | 247 | [ACLC_MIME_REGEX] = { US"mime_regex", TRUE, FALSE, (unsigned int) ~ACL_BIT_MIME }, |
2d009132 | 248 | #endif |
84330b7b | 249 | |
f2ed27cf | 250 | [ACLC_QUEUE] = { US"queue", TRUE, TRUE, |
e3a69b62 | 251 | ACL_BIT_NOTSMTP | |
2d009132 | 252 | #ifndef DISABLE_PRDR |
e3a69b62 | 253 | ACL_BIT_PRDR | |
2d009132 | 254 | #endif |
e3a69b62 | 255 | ACL_BIT_DATA, |
2d009132 | 256 | }, |
fb2274d4 | 257 | |
f2ed27cf | 258 | [ACLC_RATELIMIT] = { US"ratelimit", TRUE, FALSE, 0 }, |
e3a69b62 | 259 | [ACLC_RECIPIENTS] = { US"recipients", FALSE, FALSE, (unsigned int) ~ACL_BIT_RCPT }, |
4840604e | 260 | |
2d009132 | 261 | #ifdef WITH_CONTENT_SCAN |
f2ed27cf JH |
262 | [ACLC_REGEX] = { US"regex", TRUE, FALSE, |
263 | (unsigned int) | |
e3a69b62 | 264 | ~(ACL_BIT_DATA | |
2d009132 | 265 | # ifndef DISABLE_PRDR |
e3a69b62 | 266 | ACL_BIT_PRDR | |
2d009132 | 267 | # endif |
e3a69b62 JH |
268 | ACL_BIT_NOTSMTP | |
269 | ACL_BIT_MIME), | |
2d009132 | 270 | }, |
379ba7d0 | 271 | |
2d009132 | 272 | #endif |
f2ed27cf JH |
273 | [ACLC_REMOVE_HEADER] = { US"remove_header", TRUE, TRUE, |
274 | (unsigned int) | |
e3a69b62 JH |
275 | ~(ACL_BIT_MAIL|ACL_BIT_RCPT | |
276 | ACL_BIT_PREDATA | ACL_BIT_DATA | | |
2d009132 | 277 | #ifndef DISABLE_PRDR |
e3a69b62 | 278 | ACL_BIT_PRDR | |
2d009132 | 279 | #endif |
e3a69b62 JH |
280 | ACL_BIT_MIME | ACL_BIT_NOTSMTP | |
281 | ACL_BIT_NOTSMTP_START), | |
2d009132 | 282 | }, |
f2ed27cf | 283 | [ACLC_SENDER_DOMAINS] = { US"sender_domains", FALSE, FALSE, |
e3a69b62 JH |
284 | ACL_BIT_AUTH | ACL_BIT_CONNECT | |
285 | ACL_BIT_HELO | | |
286 | ACL_BIT_MAILAUTH | ACL_BIT_QUIT | | |
287 | ACL_BIT_ETRN | ACL_BIT_EXPN | | |
288 | ACL_BIT_STARTTLS | ACL_BIT_VRFY, | |
2d009132 | 289 | }, |
f2ed27cf | 290 | [ACLC_SENDERS] = { US"senders", FALSE, FALSE, |
e3a69b62 JH |
291 | ACL_BIT_AUTH | ACL_BIT_CONNECT | |
292 | ACL_BIT_HELO | | |
293 | ACL_BIT_MAILAUTH | ACL_BIT_QUIT | | |
294 | ACL_BIT_ETRN | ACL_BIT_EXPN | | |
295 | ACL_BIT_STARTTLS | ACL_BIT_VRFY, | |
2d009132 | 296 | }, |
65a7d8c3 | 297 | |
f2ed27cf | 298 | [ACLC_SET] = { US"set", TRUE, TRUE, 0 }, |
8523533c | 299 | |
2d009132 | 300 | #ifdef WITH_CONTENT_SCAN |
f2ed27cf | 301 | [ACLC_SPAM] = { US"spam", TRUE, FALSE, |
e3a69b62 | 302 | (unsigned int) ~(ACL_BIT_DATA | |
2d009132 | 303 | # ifndef DISABLE_PRDR |
e3a69b62 | 304 | ACL_BIT_PRDR | |
2d009132 | 305 | # endif |
e3a69b62 | 306 | ACL_BIT_NOTSMTP), |
2d009132 JH |
307 | }, |
308 | #endif | |
7952eef9 | 309 | #ifdef SUPPORT_SPF |
f2ed27cf | 310 | [ACLC_SPF] = { US"spf", TRUE, FALSE, |
e3a69b62 JH |
311 | ACL_BIT_AUTH | ACL_BIT_CONNECT | |
312 | ACL_BIT_HELO | ACL_BIT_MAILAUTH | | |
313 | ACL_BIT_ETRN | ACL_BIT_EXPN | | |
314 | ACL_BIT_STARTTLS | ACL_BIT_VRFY | | |
315 | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START, | |
2d009132 | 316 | }, |
6e1a8743 | 317 | [ACLC_SPF_GUESS] = { US"spf_guess", TRUE, FALSE, |
e3a69b62 JH |
318 | ACL_BIT_AUTH | ACL_BIT_CONNECT | |
319 | ACL_BIT_HELO | ACL_BIT_MAILAUTH | | |
320 | ACL_BIT_ETRN | ACL_BIT_EXPN | | |
321 | ACL_BIT_STARTTLS | ACL_BIT_VRFY | | |
322 | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START, | |
2d009132 JH |
323 | }, |
324 | #endif | |
f2ed27cf | 325 | [ACLC_UDPSEND] = { US"udpsend", TRUE, TRUE, 0 }, |
b0019c78 | 326 | |
059ec3d9 PH |
327 | /* Certain types of verify are always allowed, so we let it through |
328 | always and check in the verify function itself */ | |
f2ed27cf | 329 | [ACLC_VERIFY] = { US"verify", TRUE, FALSE, 0 }, |
059ec3d9 PH |
330 | }; |
331 | ||
332 | ||
2d009132 | 333 | |
d7bed771 JH |
334 | /* Return values from decode_control(); used as index so keep in step |
335 | with the controls_list table that follows! */ | |
c46782ef | 336 | |
d7bed771 JH |
337 | enum { |
338 | CONTROL_AUTH_UNADVERTISED, | |
3c8b3577 | 339 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
d7bed771 | 340 | CONTROL_BMI_RUN, |
3c8b3577 | 341 | #endif |
d7bed771 JH |
342 | CONTROL_CASEFUL_LOCAL_PART, |
343 | CONTROL_CASELOWER_LOCAL_PART, | |
344 | CONTROL_CUTTHROUGH_DELIVERY, | |
345 | CONTROL_DEBUG, | |
3c8b3577 | 346 | #ifndef DISABLE_DKIM |
d7bed771 | 347 | CONTROL_DKIM_VERIFY, |
3c8b3577 | 348 | #endif |
1a2e76e1 | 349 | #ifdef SUPPORT_DMARC |
d7bed771 JH |
350 | CONTROL_DMARC_VERIFY, |
351 | CONTROL_DMARC_FORENSIC, | |
3c8b3577 | 352 | #endif |
d7bed771 JH |
353 | CONTROL_DSCP, |
354 | CONTROL_ENFORCE_SYNC, | |
355 | CONTROL_ERROR, /* pseudo-value for decode errors */ | |
356 | CONTROL_FAKEDEFER, | |
357 | CONTROL_FAKEREJECT, | |
358 | CONTROL_FREEZE, | |
4840604e | 359 | |
d7bed771 JH |
360 | CONTROL_NO_CALLOUT_FLUSH, |
361 | CONTROL_NO_DELAY_FLUSH, | |
362 | CONTROL_NO_ENFORCE_SYNC, | |
3c8b3577 | 363 | #ifdef WITH_CONTENT_SCAN |
d7bed771 | 364 | CONTROL_NO_MBOX_UNSPOOL, |
3c8b3577 | 365 | #endif |
d7bed771 JH |
366 | CONTROL_NO_MULTILINE, |
367 | CONTROL_NO_PIPELINING, | |
8523533c | 368 | |
d7bed771 JH |
369 | CONTROL_QUEUE_ONLY, |
370 | CONTROL_SUBMISSION, | |
371 | CONTROL_SUPPRESS_LOCAL_FIXUPS, | |
8c5d388a | 372 | #ifdef SUPPORT_I18N |
d7bed771 | 373 | CONTROL_UTF8_DOWNCONVERT, |
3c8b3577 | 374 | #endif |
d7bed771 | 375 | }; |
3c8b3577 | 376 | |
4c590bd1 | 377 | |
c5fcb476 | 378 | |
d7bed771 JH |
379 | /* Structure listing various control arguments, with their characteristics. |
380 | For each control, there's a bitmap of dis-allowed times. For some, it is easier | |
381 | to specify the negation of a small number of allowed times. */ | |
059ec3d9 PH |
382 | |
383 | typedef struct control_def { | |
d7bed771 JH |
384 | uschar *name; |
385 | BOOL has_option; /* Has /option(s) following */ | |
386 | unsigned forbids; /* bitmap of dis-allowed times */ | |
059ec3d9 PH |
387 | } control_def; |
388 | ||
389 | static control_def controls_list[] = { | |
f2ed27cf JH |
390 | /* name has_option forbids */ |
391 | [CONTROL_AUTH_UNADVERTISED] = | |
d7bed771 | 392 | { US"allow_auth_unadvertised", FALSE, |
f2ed27cf | 393 | (unsigned) |
e3a69b62 | 394 | ~(ACL_BIT_CONNECT | ACL_BIT_HELO) |
d7bed771 | 395 | }, |
8523533c | 396 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
f2ed27cf JH |
397 | [CONTROL_BMI_RUN] = |
398 | { US"bmi_run", FALSE, 0 }, | |
fb2274d4 | 399 | #endif |
f2ed27cf | 400 | [CONTROL_CASEFUL_LOCAL_PART] = |
e3a69b62 | 401 | { US"caseful_local_part", FALSE, (unsigned) ~ACL_BIT_RCPT }, |
f2ed27cf | 402 | [CONTROL_CASELOWER_LOCAL_PART] = |
e3a69b62 | 403 | { US"caselower_local_part", FALSE, (unsigned) ~ACL_BIT_RCPT }, |
f2ed27cf JH |
404 | [CONTROL_CUTTHROUGH_DELIVERY] = |
405 | { US"cutthrough_delivery", TRUE, 0 }, | |
406 | [CONTROL_DEBUG] = | |
407 | { US"debug", TRUE, 0 }, | |
d7bed771 | 408 | |
80a47a2c | 409 | #ifndef DISABLE_DKIM |
f2ed27cf | 410 | [CONTROL_DKIM_VERIFY] = |
d7bed771 | 411 | { US"dkim_disable_verify", FALSE, |
e3a69b62 | 412 | ACL_BIT_DATA | ACL_BIT_NOTSMTP | |
d7bed771 | 413 | # ifndef DISABLE_PRDR |
e3a69b62 | 414 | ACL_BIT_PRDR | |
d7bed771 | 415 | # endif |
e3a69b62 | 416 | ACL_BIT_NOTSMTP_START |
d7bed771 | 417 | }, |
4840604e | 418 | #endif |
d7bed771 | 419 | |
1a2e76e1 | 420 | #ifdef SUPPORT_DMARC |
9904d08c | 421 | [CONTROL_DMARC_VERIFY] = |
d7bed771 | 422 | { US"dmarc_disable_verify", FALSE, |
e3a69b62 | 423 | ACL_BIT_DATA | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START |
d7bed771 | 424 | }, |
9904d08c | 425 | [CONTROL_DMARC_FORENSIC] = |
d7bed771 | 426 | { US"dmarc_enable_forensic", FALSE, |
e3a69b62 | 427 | ACL_BIT_DATA | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START |
d7bed771 JH |
428 | }, |
429 | #endif | |
430 | ||
f2ed27cf | 431 | [CONTROL_DSCP] = |
d7bed771 | 432 | { US"dscp", TRUE, |
e3a69b62 | 433 | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START | ACL_BIT_NOTQUIT |
d7bed771 | 434 | }, |
f2ed27cf | 435 | [CONTROL_ENFORCE_SYNC] = |
d7bed771 | 436 | { US"enforce_sync", FALSE, |
e3a69b62 | 437 | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START |
d7bed771 JH |
438 | }, |
439 | ||
440 | /* Pseudo-value for decode errors */ | |
f2ed27cf | 441 | [CONTROL_ERROR] = |
d7bed771 JH |
442 | { US"error", FALSE, 0 }, |
443 | ||
f2ed27cf | 444 | [CONTROL_FAKEDEFER] = |
d7bed771 | 445 | { US"fakedefer", TRUE, |
f2ed27cf | 446 | (unsigned) |
e3a69b62 JH |
447 | ~(ACL_BIT_MAIL | ACL_BIT_RCPT | |
448 | ACL_BIT_PREDATA | ACL_BIT_DATA | | |
d7bed771 | 449 | #ifndef DISABLE_PRDR |
e3a69b62 | 450 | ACL_BIT_PRDR | |
d7bed771 | 451 | #endif |
e3a69b62 | 452 | ACL_BIT_MIME) |
d7bed771 | 453 | }, |
f2ed27cf | 454 | [CONTROL_FAKEREJECT] = |
d7bed771 | 455 | { US"fakereject", TRUE, |
f2ed27cf | 456 | (unsigned) |
e3a69b62 JH |
457 | ~(ACL_BIT_MAIL | ACL_BIT_RCPT | |
458 | ACL_BIT_PREDATA | ACL_BIT_DATA | | |
d7bed771 | 459 | #ifndef DISABLE_PRDR |
e3a69b62 | 460 | ACL_BIT_PRDR | |
d7bed771 | 461 | #endif |
e3a69b62 | 462 | ACL_BIT_MIME) |
d7bed771 | 463 | }, |
f2ed27cf | 464 | [CONTROL_FREEZE] = |
d7bed771 | 465 | { US"freeze", TRUE, |
f2ed27cf | 466 | (unsigned) |
e3a69b62 JH |
467 | ~(ACL_BIT_MAIL | ACL_BIT_RCPT | |
468 | ACL_BIT_PREDATA | ACL_BIT_DATA | | |
469 | // ACL_BIT_PRDR| /* Not allow one user to freeze for all */ | |
470 | ACL_BIT_NOTSMTP | ACL_BIT_MIME) | |
d7bed771 JH |
471 | }, |
472 | ||
f2ed27cf | 473 | [CONTROL_NO_CALLOUT_FLUSH] = |
d7bed771 | 474 | { US"no_callout_flush", FALSE, |
e3a69b62 | 475 | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START |
d7bed771 | 476 | }, |
f2ed27cf | 477 | [CONTROL_NO_DELAY_FLUSH] = |
d7bed771 | 478 | { US"no_delay_flush", FALSE, |
e3a69b62 | 479 | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START |
d7bed771 JH |
480 | }, |
481 | ||
f2ed27cf | 482 | [CONTROL_NO_ENFORCE_SYNC] = |
d7bed771 | 483 | { US"no_enforce_sync", FALSE, |
e3a69b62 | 484 | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START |
d7bed771 | 485 | }, |
8523533c | 486 | #ifdef WITH_CONTENT_SCAN |
f2ed27cf | 487 | [CONTROL_NO_MBOX_UNSPOOL] = |
d7bed771 | 488 | { US"no_mbox_unspool", FALSE, |
f2ed27cf | 489 | (unsigned) |
e3a69b62 JH |
490 | ~(ACL_BIT_MAIL | ACL_BIT_RCPT | |
491 | ACL_BIT_PREDATA | ACL_BIT_DATA | | |
492 | // ACL_BIT_PRDR| /* Not allow one user to freeze for all */ | |
493 | ACL_BIT_MIME) | |
d7bed771 JH |
494 | }, |
495 | #endif | |
f2ed27cf | 496 | [CONTROL_NO_MULTILINE] = |
d7bed771 | 497 | { US"no_multiline_responses", FALSE, |
e3a69b62 | 498 | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START |
d7bed771 | 499 | }, |
f2ed27cf | 500 | [CONTROL_NO_PIPELINING] = |
d7bed771 | 501 | { US"no_pipelining", FALSE, |
e3a69b62 | 502 | ACL_BIT_NOTSMTP | ACL_BIT_NOTSMTP_START |
d7bed771 JH |
503 | }, |
504 | ||
f2ed27cf | 505 | [CONTROL_QUEUE_ONLY] = |
d7bed771 | 506 | { US"queue_only", FALSE, |
f2ed27cf | 507 | (unsigned) |
e3a69b62 JH |
508 | ~(ACL_BIT_MAIL | ACL_BIT_RCPT | |
509 | ACL_BIT_PREDATA | ACL_BIT_DATA | | |
510 | // ACL_BIT_PRDR| /* Not allow one user to freeze for all */ | |
511 | ACL_BIT_NOTSMTP | ACL_BIT_MIME) | |
d7bed771 | 512 | }, |
8ac90765 JH |
513 | |
514 | ||
f2ed27cf | 515 | [CONTROL_SUBMISSION] = |
d7bed771 | 516 | { US"submission", TRUE, |
f2ed27cf | 517 | (unsigned) |
e3a69b62 | 518 | ~(ACL_BIT_MAIL | ACL_BIT_RCPT | ACL_BIT_PREDATA) |
d7bed771 | 519 | }, |
f2ed27cf | 520 | [CONTROL_SUPPRESS_LOCAL_FIXUPS] = |
d7bed771 JH |
521 | { US"suppress_local_fixups", FALSE, |
522 | (unsigned) | |
e3a69b62 JH |
523 | ~(ACL_BIT_MAIL | ACL_BIT_RCPT | ACL_BIT_PREDATA | |
524 | ACL_BIT_NOTSMTP_START) | |
d7bed771 | 525 | }, |
8c5d388a | 526 | #ifdef SUPPORT_I18N |
f2ed27cf | 527 | [CONTROL_UTF8_DOWNCONVERT] = |
6741531c JH |
528 | { US"utf8_downconvert", TRUE, (unsigned) ~(ACL_BIT_RCPT | ACL_BIT_VRFY) |
529 | } | |
3c8b3577 | 530 | #endif |
d7bed771 | 531 | }; |
059ec3d9 | 532 | |
e5a9dba6 PH |
533 | /* Support data structures for Client SMTP Authorization. acl_verify_csa() |
534 | caches its result in a tree to avoid repeated DNS queries. The result is an | |
535 | integer code which is used as an index into the following tables of | |
536 | explanatory strings and verification return codes. */ | |
537 | ||
538 | static tree_node *csa_cache = NULL; | |
539 | ||
540 | enum { CSA_UNKNOWN, CSA_OK, CSA_DEFER_SRV, CSA_DEFER_ADDR, | |
541 | CSA_FAIL_EXPLICIT, CSA_FAIL_DOMAIN, CSA_FAIL_NOADDR, CSA_FAIL_MISMATCH }; | |
542 | ||
543 | /* The acl_verify_csa() return code is translated into an acl_verify() return | |
544 | code using the following table. It is OK unless the client is definitely not | |
545 | authorized. This is because CSA is supposed to be optional for sending sites, | |
546 | so recipients should not be too strict about checking it - especially because | |
547 | DNS problems are quite likely to occur. It's possible to use $csa_status in | |
548 | further ACL conditions to distinguish ok, unknown, and defer if required, but | |
549 | the aim is to make the usual configuration simple. */ | |
550 | ||
551 | static int csa_return_code[] = { | |
f2ed27cf JH |
552 | [CSA_UNKNOWN] = OK, |
553 | [CSA_OK] = OK, | |
554 | [CSA_DEFER_SRV] = OK, | |
555 | [CSA_DEFER_ADDR] = OK, | |
556 | [CSA_FAIL_EXPLICIT] = FAIL, | |
557 | [CSA_FAIL_DOMAIN] = FAIL, | |
558 | [CSA_FAIL_NOADDR] = FAIL, | |
559 | [CSA_FAIL_MISMATCH] = FAIL | |
e5a9dba6 PH |
560 | }; |
561 | ||
562 | static uschar *csa_status_string[] = { | |
f2ed27cf JH |
563 | [CSA_UNKNOWN] = US"unknown", |
564 | [CSA_OK] = US"ok", | |
565 | [CSA_DEFER_SRV] = US"defer", | |
566 | [CSA_DEFER_ADDR] = US"defer", | |
567 | [CSA_FAIL_EXPLICIT] = US"fail", | |
568 | [CSA_FAIL_DOMAIN] = US"fail", | |
569 | [CSA_FAIL_NOADDR] = US"fail", | |
570 | [CSA_FAIL_MISMATCH] = US"fail" | |
e5a9dba6 PH |
571 | }; |
572 | ||
573 | static uschar *csa_reason_string[] = { | |
f2ed27cf JH |
574 | [CSA_UNKNOWN] = US"unknown", |
575 | [CSA_OK] = US"ok", | |
576 | [CSA_DEFER_SRV] = US"deferred (SRV lookup failed)", | |
577 | [CSA_DEFER_ADDR] = US"deferred (target address lookup failed)", | |
578 | [CSA_FAIL_EXPLICIT] = US"failed (explicit authorization required)", | |
579 | [CSA_FAIL_DOMAIN] = US"failed (host name not authorized)", | |
580 | [CSA_FAIL_NOADDR] = US"failed (no authorized addresses)", | |
581 | [CSA_FAIL_MISMATCH] = US"failed (client address mismatch)" | |
e5a9dba6 PH |
582 | }; |
583 | ||
c99ce5c9 TF |
584 | /* Options for the ratelimit condition. Note that there are two variants of |
585 | the per_rcpt option, depending on the ACL that is used to measure the rate. | |
586 | However any ACL must be able to look up per_rcpt rates in /noupdate mode, | |
587 | so the two variants must have the same internal representation as well as | |
588 | the same configuration string. */ | |
589 | ||
590 | enum { | |
591 | RATE_PER_WHAT, RATE_PER_CLASH, RATE_PER_ADDR, RATE_PER_BYTE, RATE_PER_CMD, | |
592 | RATE_PER_CONN, RATE_PER_MAIL, RATE_PER_RCPT, RATE_PER_ALLRCPTS | |
593 | }; | |
594 | ||
595 | #define RATE_SET(var,new) \ | |
596 | (((var) == RATE_PER_WHAT) ? ((var) = RATE_##new) : ((var) = RATE_PER_CLASH)) | |
597 | ||
598 | static uschar *ratelimit_option_string[] = { | |
f2ed27cf JH |
599 | [RATE_PER_WHAT] = US"?", |
600 | [RATE_PER_CLASH] = US"!", | |
601 | [RATE_PER_ADDR] = US"per_addr", | |
602 | [RATE_PER_BYTE] = US"per_byte", | |
603 | [RATE_PER_CMD] = US"per_cmd", | |
604 | [RATE_PER_CONN] = US"per_conn", | |
605 | [RATE_PER_MAIL] = US"per_mail", | |
606 | [RATE_PER_RCPT] = US"per_rcpt", | |
607 | [RATE_PER_ALLRCPTS] = US"per_rcpt" | |
c99ce5c9 TF |
608 | }; |
609 | ||
059ec3d9 PH |
610 | /* Enable recursion between acl_check_internal() and acl_check_condition() */ |
611 | ||
e1d04f48 | 612 | static int acl_check_wargs(int, address_item *, const uschar *, uschar **, |
f60d98e8 | 613 | uschar **); |
059ec3d9 PH |
614 | |
615 | ||
d7bed771 JH |
616 | /************************************************* |
617 | * Find control in list * | |
618 | *************************************************/ | |
619 | ||
620 | /* The lists are always in order, so binary chop can be used. | |
621 | ||
622 | Arguments: | |
623 | name the control name to search for | |
624 | ol the first entry in the control list | |
625 | last one more than the offset of the last entry in the control list | |
626 | ||
627 | Returns: index of a control entry, or -1 if not found | |
628 | */ | |
629 | ||
630 | static int | |
631 | find_control(const uschar * name, control_def * ol, int last) | |
632 | { | |
d7978c0f | 633 | for (int first = 0; last > first; ) |
d7bed771 JH |
634 | { |
635 | int middle = (first + last)/2; | |
636 | uschar * s = ol[middle].name; | |
637 | int c = Ustrncmp(name, s, Ustrlen(s)); | |
638 | if (c == 0) return middle; | |
639 | else if (c > 0) first = middle + 1; | |
640 | else last = middle; | |
641 | } | |
642 | return -1; | |
643 | } | |
644 | ||
645 | ||
646 | ||
2d009132 JH |
647 | /************************************************* |
648 | * Pick out condition from list * | |
649 | *************************************************/ | |
650 | ||
651 | /* Use a binary chop method | |
652 | ||
653 | Arguments: | |
654 | name name to find | |
655 | list list of conditions | |
656 | end size of list | |
657 | ||
658 | Returns: offset in list, or -1 if not found | |
659 | */ | |
660 | ||
661 | static int | |
662 | acl_checkcondition(uschar * name, condition_def * list, int end) | |
663 | { | |
d7978c0f | 664 | for (int start = 0; start < end; ) |
2d009132 JH |
665 | { |
666 | int mid = (start + end)/2; | |
667 | int c = Ustrcmp(name, list[mid].name); | |
668 | if (c == 0) return mid; | |
669 | if (c < 0) end = mid; | |
670 | else start = mid + 1; | |
671 | } | |
672 | return -1; | |
673 | } | |
674 | ||
675 | ||
059ec3d9 PH |
676 | /************************************************* |
677 | * Pick out name from list * | |
678 | *************************************************/ | |
679 | ||
680 | /* Use a binary chop method | |
681 | ||
682 | Arguments: | |
683 | name name to find | |
684 | list list of names | |
685 | end size of list | |
686 | ||
687 | Returns: offset in list, or -1 if not found | |
688 | */ | |
689 | ||
690 | static int | |
691 | acl_checkname(uschar *name, uschar **list, int end) | |
692 | { | |
d7978c0f | 693 | for (int start = 0; start < end; ) |
059ec3d9 PH |
694 | { |
695 | int mid = (start + end)/2; | |
696 | int c = Ustrcmp(name, list[mid]); | |
697 | if (c == 0) return mid; | |
698 | if (c < 0) end = mid; else start = mid + 1; | |
699 | } | |
700 | ||
701 | return -1; | |
702 | } | |
703 | ||
704 | ||
705 | /************************************************* | |
706 | * Read and parse one ACL * | |
707 | *************************************************/ | |
708 | ||
709 | /* This function is called both from readconf in order to parse the ACLs in the | |
710 | configuration file, and also when an ACL is encountered dynamically (e.g. as | |
711 | the result of an expansion). It is given a function to call in order to | |
712 | retrieve the lines of the ACL. This function handles skipping comments and | |
713 | blank lines (where relevant). | |
714 | ||
715 | Arguments: | |
716 | func function to get next line of ACL | |
717 | error where to put an error message | |
718 | ||
719 | Returns: pointer to ACL, or NULL | |
720 | NULL can be legal (empty ACL); in this case error will be NULL | |
721 | */ | |
722 | ||
723 | acl_block * | |
724 | acl_read(uschar *(*func)(void), uschar **error) | |
725 | { | |
726 | acl_block *yield = NULL; | |
727 | acl_block **lastp = &yield; | |
728 | acl_block *this = NULL; | |
729 | acl_condition_block *cond; | |
730 | acl_condition_block **condp = NULL; | |
d7978c0f | 731 | uschar * s; |
059ec3d9 PH |
732 | |
733 | *error = NULL; | |
734 | ||
735 | while ((s = (*func)()) != NULL) | |
736 | { | |
737 | int v, c; | |
738 | BOOL negated = FALSE; | |
739 | uschar *saveline = s; | |
740 | uschar name[64]; | |
741 | ||
742 | /* Conditions (but not verbs) are allowed to be negated by an initial | |
743 | exclamation mark. */ | |
744 | ||
745 | while (isspace(*s)) s++; | |
746 | if (*s == '!') | |
747 | { | |
748 | negated = TRUE; | |
749 | s++; | |
750 | } | |
751 | ||
cf00dad6 PH |
752 | /* Read the name of a verb or a condition, or the start of a new ACL, which |
753 | can be started by a name, or by a macro definition. */ | |
059ec3d9 PH |
754 | |
755 | s = readconf_readname(name, sizeof(name), s); | |
b8dc3e4a | 756 | if (*s == ':' || (isupper(name[0]) && *s == '=')) return yield; |
059ec3d9 PH |
757 | |
758 | /* If a verb is unrecognized, it may be another condition or modifier that | |
759 | continues the previous verb. */ | |
760 | ||
2d009132 | 761 | if ((v = acl_checkname(name, verbs, nelem(verbs))) < 0) |
059ec3d9 | 762 | { |
897024f1 | 763 | if (!this) |
059ec3d9 | 764 | { |
4e167a8c PH |
765 | *error = string_sprintf("unknown ACL verb \"%s\" in \"%s\"", name, |
766 | saveline); | |
059ec3d9 PH |
767 | return NULL; |
768 | } | |
769 | } | |
770 | ||
771 | /* New verb */ | |
772 | ||
773 | else | |
774 | { | |
775 | if (negated) | |
776 | { | |
777 | *error = string_sprintf("malformed ACL line \"%s\"", saveline); | |
778 | return NULL; | |
779 | } | |
f3ebb786 | 780 | this = store_get(sizeof(acl_block), FALSE); |
059ec3d9 PH |
781 | *lastp = this; |
782 | lastp = &(this->next); | |
783 | this->next = NULL; | |
059ec3d9 | 784 | this->condition = NULL; |
897024f1 JH |
785 | this->verb = v; |
786 | this->srcline = config_lineno; /* for debug output */ | |
787 | this->srcfile = config_filename; /**/ | |
059ec3d9 PH |
788 | condp = &(this->condition); |
789 | if (*s == 0) continue; /* No condition on this line */ | |
790 | if (*s == '!') | |
791 | { | |
792 | negated = TRUE; | |
793 | s++; | |
794 | } | |
795 | s = readconf_readname(name, sizeof(name), s); /* Condition name */ | |
796 | } | |
797 | ||
798 | /* Handle a condition or modifier. */ | |
799 | ||
2d009132 | 800 | if ((c = acl_checkcondition(name, conditions, nelem(conditions))) < 0) |
059ec3d9 PH |
801 | { |
802 | *error = string_sprintf("unknown ACL condition/modifier in \"%s\"", | |
803 | saveline); | |
804 | return NULL; | |
805 | } | |
806 | ||
807 | /* The modifiers may not be negated */ | |
808 | ||
2d009132 | 809 | if (negated && conditions[c].is_modifier) |
059ec3d9 PH |
810 | { |
811 | *error = string_sprintf("ACL error: negation is not allowed with " | |
2d009132 | 812 | "\"%s\"", conditions[c].name); |
059ec3d9 PH |
813 | return NULL; |
814 | } | |
815 | ||
816 | /* ENDPASS may occur only with ACCEPT or DISCARD. */ | |
817 | ||
818 | if (c == ACLC_ENDPASS && | |
819 | this->verb != ACL_ACCEPT && | |
820 | this->verb != ACL_DISCARD) | |
821 | { | |
822 | *error = string_sprintf("ACL error: \"%s\" is not allowed with \"%s\"", | |
2d009132 | 823 | conditions[c].name, verbs[this->verb]); |
059ec3d9 PH |
824 | return NULL; |
825 | } | |
826 | ||
f3ebb786 | 827 | cond = store_get(sizeof(acl_condition_block), FALSE); |
059ec3d9 PH |
828 | cond->next = NULL; |
829 | cond->type = c; | |
830 | cond->u.negated = negated; | |
831 | ||
832 | *condp = cond; | |
833 | condp = &(cond->next); | |
834 | ||
835 | /* The "set" modifier is different in that its argument is "name=value" | |
836 | rather than just a value, and we can check the validity of the name, which | |
38a0a95f PH |
837 | gives us a variable name to insert into the data block. The original ACL |
838 | variable names were acl_c0 ... acl_c9 and acl_m0 ... acl_m9. This was | |
839 | extended to 20 of each type, but after that people successfully argued for | |
641cb756 PH |
840 | arbitrary names. In the new scheme, the names must start with acl_c or acl_m. |
841 | After that, we allow alphanumerics and underscores, but the first character | |
842 | after c or m must be a digit or an underscore. This retains backwards | |
843 | compatibility. */ | |
059ec3d9 PH |
844 | |
845 | if (c == ACLC_SET) | |
a79d8834 JH |
846 | #ifndef DISABLE_DKIM |
847 | if ( Ustrncmp(s, "dkim_verify_status", 18) == 0 | |
848 | || Ustrncmp(s, "dkim_verify_reason", 18) == 0) | |
849 | { | |
850 | uschar * endptr = s+18; | |
851 | ||
852 | if (isalnum(*endptr)) | |
853 | { | |
854 | *error = string_sprintf("invalid variable name after \"set\" in ACL " | |
855 | "modifier \"set %s\" " | |
856 | "(only \"dkim_verify_status\" or \"dkim_verify_reason\" permitted)", | |
857 | s); | |
858 | return NULL; | |
859 | } | |
860 | cond->u.varname = string_copyn(s, 18); | |
861 | s = endptr; | |
862 | while (isspace(*s)) s++; | |
863 | } | |
864 | else | |
865 | #endif | |
059ec3d9 | 866 | { |
47ca6d6c PH |
867 | uschar *endptr; |
868 | ||
38a0a95f PH |
869 | if (Ustrncmp(s, "acl_c", 5) != 0 && |
870 | Ustrncmp(s, "acl_m", 5) != 0) | |
47ca6d6c | 871 | { |
38a0a95f PH |
872 | *error = string_sprintf("invalid variable name after \"set\" in ACL " |
873 | "modifier \"set %s\" (must start \"acl_c\" or \"acl_m\")", s); | |
874 | return NULL; | |
47ca6d6c | 875 | } |
38a0a95f PH |
876 | |
877 | endptr = s + 5; | |
641cb756 PH |
878 | if (!isdigit(*endptr) && *endptr != '_') |
879 | { | |
880 | *error = string_sprintf("invalid variable name after \"set\" in ACL " | |
881 | "modifier \"set %s\" (digit or underscore must follow acl_c or acl_m)", | |
882 | s); | |
883 | return NULL; | |
884 | } | |
885 | ||
38a0a95f | 886 | while (*endptr != 0 && *endptr != '=' && !isspace(*endptr)) |
47ca6d6c | 887 | { |
38a0a95f PH |
888 | if (!isalnum(*endptr) && *endptr != '_') |
889 | { | |
890 | *error = string_sprintf("invalid character \"%c\" in variable name " | |
891 | "in ACL modifier \"set %s\"", *endptr, s); | |
892 | return NULL; | |
893 | } | |
894 | endptr++; | |
47ca6d6c | 895 | } |
47ca6d6c | 896 | |
38a0a95f | 897 | cond->u.varname = string_copyn(s + 4, endptr - s - 4); |
47ca6d6c | 898 | s = endptr; |
059ec3d9 PH |
899 | while (isspace(*s)) s++; |
900 | } | |
901 | ||
902 | /* For "set", we are now positioned for the data. For the others, only | |
903 | "endpass" has no data */ | |
904 | ||
905 | if (c != ACLC_ENDPASS) | |
906 | { | |
907 | if (*s++ != '=') | |
908 | { | |
909 | *error = string_sprintf("\"=\" missing after ACL \"%s\" %s", name, | |
2d009132 | 910 | conditions[c].is_modifier ? US"modifier" : US"condition"); |
059ec3d9 PH |
911 | return NULL; |
912 | } | |
913 | while (isspace(*s)) s++; | |
914 | cond->arg = string_copy(s); | |
915 | } | |
916 | } | |
917 | ||
918 | return yield; | |
919 | } | |
920 | ||
921 | ||
922 | ||
71fafd95 PH |
923 | /************************************************* |
924 | * Set up added header line(s) * | |
925 | *************************************************/ | |
926 | ||
927 | /* This function is called by the add_header modifier, and also from acl_warn() | |
928 | to implement the now-deprecated way of adding header lines using "message" on a | |
929 | "warn" verb. The argument is treated as a sequence of header lines which are | |
930 | added to a chain, provided there isn't an identical one already there. | |
931 | ||
932 | Argument: string of header lines | |
933 | Returns: nothing | |
934 | */ | |
935 | ||
936 | static void | |
55414b25 | 937 | setup_header(const uschar *hstring) |
71fafd95 | 938 | { |
55414b25 | 939 | const uschar *p, *q; |
71fafd95 PH |
940 | int hlen = Ustrlen(hstring); |
941 | ||
b1b05573 JH |
942 | /* Ignore any leading newlines */ |
943 | while (*hstring == '\n') hstring++, hlen--; | |
71fafd95 | 944 | |
b1b05573 | 945 | /* An empty string does nothing; ensure exactly one final newline. */ |
71fafd95 | 946 | if (hlen <= 0) return; |
96f5fe4c | 947 | if (hstring[--hlen] != '\n') /* no newline */ |
55414b25 | 948 | q = string_sprintf("%s\n", hstring); |
96f5fe4c | 949 | else if (hstring[hlen-1] == '\n') /* double newline */ |
55414b25 JH |
950 | { |
951 | uschar * s = string_copy(hstring); | |
952 | while(s[--hlen] == '\n') | |
953 | s[hlen+1] = '\0'; | |
954 | q = s; | |
955 | } | |
956 | else | |
957 | q = hstring; | |
71fafd95 PH |
958 | |
959 | /* Loop for multiple header lines, taking care about continuations */ | |
960 | ||
617d3932 | 961 | for (p = q; *p; p = q) |
71fafd95 | 962 | { |
55414b25 JH |
963 | const uschar *s; |
964 | uschar * hdr; | |
71fafd95 PH |
965 | int newtype = htype_add_bot; |
966 | header_line **hptr = &acl_added_headers; | |
967 | ||
968 | /* Find next header line within the string */ | |
969 | ||
970 | for (;;) | |
971 | { | |
96f5fe4c | 972 | q = Ustrchr(q, '\n'); /* we know there was a newline */ |
617d3932 | 973 | if (*++q != ' ' && *q != '\t') break; |
71fafd95 PH |
974 | } |
975 | ||
976 | /* If the line starts with a colon, interpret the instruction for where to | |
977 | add it. This temporarily sets up a new type. */ | |
978 | ||
979 | if (*p == ':') | |
980 | { | |
981 | if (strncmpic(p, US":after_received:", 16) == 0) | |
982 | { | |
983 | newtype = htype_add_rec; | |
984 | p += 16; | |
985 | } | |
986 | else if (strncmpic(p, US":at_start_rfc:", 14) == 0) | |
987 | { | |
988 | newtype = htype_add_rfc; | |
989 | p += 14; | |
990 | } | |
991 | else if (strncmpic(p, US":at_start:", 10) == 0) | |
992 | { | |
993 | newtype = htype_add_top; | |
994 | p += 10; | |
995 | } | |
996 | else if (strncmpic(p, US":at_end:", 8) == 0) | |
997 | { | |
998 | newtype = htype_add_bot; | |
999 | p += 8; | |
1000 | } | |
1001 | while (*p == ' ' || *p == '\t') p++; | |
1002 | } | |
1003 | ||
1004 | /* See if this line starts with a header name, and if not, add X-ACL-Warn: | |
1005 | to the front of it. */ | |
1006 | ||
1007 | for (s = p; s < q - 1; s++) | |
71fafd95 | 1008 | if (*s == ':' || !isgraph(*s)) break; |
71fafd95 | 1009 | |
617d3932 | 1010 | hdr = string_sprintf("%s%.*s", *s == ':' ? "" : "X-ACL-Warn: ", (int) (q - p), p); |
55414b25 | 1011 | hlen = Ustrlen(hdr); |
71fafd95 PH |
1012 | |
1013 | /* See if this line has already been added */ | |
1014 | ||
617d3932 | 1015 | while (*hptr) |
71fafd95 | 1016 | { |
55414b25 | 1017 | if (Ustrncmp((*hptr)->text, hdr, hlen) == 0) break; |
617d3932 | 1018 | hptr = &(*hptr)->next; |
71fafd95 PH |
1019 | } |
1020 | ||
1021 | /* Add if not previously present */ | |
1022 | ||
617d3932 | 1023 | if (!*hptr) |
71fafd95 | 1024 | { |
f3ebb786 JH |
1025 | /* The header_line struct itself is not tainted, though it points to |
1026 | tainted data. */ | |
1027 | header_line *h = store_get(sizeof(header_line), FALSE); | |
55414b25 | 1028 | h->text = hdr; |
71fafd95 PH |
1029 | h->next = NULL; |
1030 | h->type = newtype; | |
1031 | h->slen = hlen; | |
1032 | *hptr = h; | |
617d3932 | 1033 | hptr = &h->next; |
71fafd95 | 1034 | } |
71fafd95 PH |
1035 | } |
1036 | } | |
1037 | ||
1038 | ||
1039 | ||
362145b5 JH |
1040 | /************************************************* |
1041 | * List the added header lines * | |
1042 | *************************************************/ | |
1043 | uschar * | |
1044 | fn_hdrs_added(void) | |
1045 | { | |
acec9514 | 1046 | gstring * g = NULL; |
362145b5 | 1047 | |
d7978c0f | 1048 | for (header_line * h = acl_added_headers; h; h = h->next) |
362145b5 | 1049 | { |
bce15b62 JH |
1050 | int i = h->slen; |
1051 | if (h->text[i-1] == '\n') i--; | |
1052 | g = string_append_listele_n(g, '\n', h->text, i); | |
362145b5 | 1053 | } |
362145b5 | 1054 | |
bce15b62 | 1055 | return g ? g->s : NULL; |
362145b5 JH |
1056 | } |
1057 | ||
1058 | ||
e7568d51 TL |
1059 | /************************************************* |
1060 | * Set up removed header line(s) * | |
1061 | *************************************************/ | |
1062 | ||
1063 | /* This function is called by the remove_header modifier. The argument is | |
1064 | treated as a sequence of header names which are added to a colon separated | |
1065 | list, provided there isn't an identical one already there. | |
1066 | ||
1067 | Argument: string of header names | |
1068 | Returns: nothing | |
1069 | */ | |
1070 | ||
1071 | static void | |
55414b25 | 1072 | setup_remove_header(const uschar *hnames) |
e7568d51 | 1073 | { |
48334568 | 1074 | if (*hnames) |
55414b25 JH |
1075 | acl_removed_headers = acl_removed_headers |
1076 | ? string_sprintf("%s : %s", acl_removed_headers, hnames) | |
1077 | : string_copy(hnames); | |
e7568d51 TL |
1078 | } |
1079 | ||
1080 | ||
71fafd95 | 1081 | |
059ec3d9 PH |
1082 | /************************************************* |
1083 | * Handle warnings * | |
1084 | *************************************************/ | |
1085 | ||
1086 | /* This function is called when a WARN verb's conditions are true. It adds to | |
1087 | the message's headers, and/or writes information to the log. In each case, this | |
1088 | only happens once (per message for headers, per connection for log). | |
1089 | ||
71fafd95 PH |
1090 | ** NOTE: The header adding action using the "message" setting is historic, and |
1091 | its use is now deprecated. The new add_header modifier should be used instead. | |
1092 | ||
059ec3d9 PH |
1093 | Arguments: |
1094 | where ACL_WHERE_xxxx indicating which ACL this is | |
1095 | user_message message for adding to headers | |
1096 | log_message message for logging, if different | |
1097 | ||
1098 | Returns: nothing | |
1099 | */ | |
1100 | ||
1101 | static void | |
1102 | acl_warn(int where, uschar *user_message, uschar *log_message) | |
1103 | { | |
059ec3d9 PH |
1104 | if (log_message != NULL && log_message != user_message) |
1105 | { | |
1106 | uschar *text; | |
1107 | string_item *logged; | |
1108 | ||
1109 | text = string_sprintf("%s Warning: %s", host_and_ident(TRUE), | |
1110 | string_printing(log_message)); | |
1111 | ||
1112 | /* If a sender verification has failed, and the log message is "sender verify | |
1113 | failed", add the failure message. */ | |
1114 | ||
1115 | if (sender_verified_failed != NULL && | |
1116 | sender_verified_failed->message != NULL && | |
1117 | strcmpic(log_message, US"sender verify failed") == 0) | |
1118 | text = string_sprintf("%s: %s", text, sender_verified_failed->message); | |
1119 | ||
9c7a242c PH |
1120 | /* Search previously logged warnings. They are kept in malloc |
1121 | store so they can be freed at the start of a new message. */ | |
059ec3d9 | 1122 | |
d7978c0f | 1123 | for (logged = acl_warn_logged; logged; logged = logged->next) |
059ec3d9 PH |
1124 | if (Ustrcmp(logged->text, text) == 0) break; |
1125 | ||
d7978c0f | 1126 | if (!logged) |
059ec3d9 PH |
1127 | { |
1128 | int length = Ustrlen(text) + 1; | |
1129 | log_write(0, LOG_MAIN, "%s", text); | |
1130 | logged = store_malloc(sizeof(string_item) + length); | |
5903c6ff | 1131 | logged->text = US logged + sizeof(string_item); |
059ec3d9 PH |
1132 | memcpy(logged->text, text, length); |
1133 | logged->next = acl_warn_logged; | |
1134 | acl_warn_logged = logged; | |
1135 | } | |
1136 | } | |
1137 | ||
1138 | /* If there's no user message, we are done. */ | |
1139 | ||
d7978c0f | 1140 | if (!user_message) return; |
059ec3d9 PH |
1141 | |
1142 | /* If this isn't a message ACL, we can't do anything with a user message. | |
1143 | Log an error. */ | |
1144 | ||
1145 | if (where > ACL_WHERE_NOTSMTP) | |
1146 | { | |
1147 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting " | |
1148 | "found in a non-message (%s) ACL: cannot specify header lines here: " | |
1149 | "message ignored", acl_wherenames[where]); | |
1150 | return; | |
1151 | } | |
1152 | ||
71fafd95 PH |
1153 | /* The code for setting up header lines is now abstracted into a separate |
1154 | function so that it can be used for the add_header modifier as well. */ | |
059ec3d9 | 1155 | |
71fafd95 | 1156 | setup_header(user_message); |
059ec3d9 PH |
1157 | } |
1158 | ||
1159 | ||
1160 | ||
1161 | /************************************************* | |
1162 | * Verify and check reverse DNS * | |
1163 | *************************************************/ | |
1164 | ||
1165 | /* Called from acl_verify() below. We look up the host name(s) of the client IP | |
1166 | address if this has not yet been done. The host_name_lookup() function checks | |
1167 | that one of these names resolves to an address list that contains the client IP | |
1168 | address, so we don't actually have to do the check here. | |
1169 | ||
1170 | Arguments: | |
1171 | user_msgptr pointer for user message | |
1172 | log_msgptr pointer for log message | |
1173 | ||
1174 | Returns: OK verification condition succeeded | |
1175 | FAIL verification failed | |
1176 | DEFER there was a problem verifying | |
1177 | */ | |
1178 | ||
1179 | static int | |
1180 | acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr) | |
1181 | { | |
1182 | int rc; | |
1183 | ||
1184 | user_msgptr = user_msgptr; /* stop compiler warning */ | |
1185 | ||
1186 | /* Previous success */ | |
1187 | ||
1188 | if (sender_host_name != NULL) return OK; | |
1189 | ||
1190 | /* Previous failure */ | |
1191 | ||
1192 | if (host_lookup_failed) | |
1193 | { | |
1194 | *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg); | |
1195 | return FAIL; | |
1196 | } | |
1197 | ||
1198 | /* Need to do a lookup */ | |
1199 | ||
1200 | HDEBUG(D_acl) | |
e1d04f48 | 1201 | debug_printf_indent("looking up host name to force name/address consistency check\n"); |
059ec3d9 PH |
1202 | |
1203 | if ((rc = host_name_lookup()) != OK) | |
1204 | { | |
d7978c0f JH |
1205 | *log_msgptr = rc == DEFER |
1206 | ? US"host lookup deferred for reverse lookup check" | |
1207 | : string_sprintf("host lookup failed for reverse lookup check%s", | |
1208 | host_lookup_msg); | |
059ec3d9 PH |
1209 | return rc; /* DEFER or FAIL */ |
1210 | } | |
1211 | ||
1212 | host_build_sender_fullhost(); | |
1213 | return OK; | |
1214 | } | |
1215 | ||
1216 | ||
1217 | ||
e5a9dba6 PH |
1218 | /************************************************* |
1219 | * Check client IP address matches CSA target * | |
1220 | *************************************************/ | |
1221 | ||
1222 | /* Called from acl_verify_csa() below. This routine scans a section of a DNS | |
1223 | response for address records belonging to the CSA target hostname. The section | |
1224 | is specified by the reset argument, either RESET_ADDITIONAL or RESET_ANSWERS. | |
1225 | If one of the addresses matches the client's IP address, then the client is | |
1226 | authorized by CSA. If there are target IP addresses but none of them match | |
1227 | then the client is using an unauthorized IP address. If there are no target IP | |
1228 | addresses then the client cannot be using an authorized IP address. (This is | |
1229 | an odd configuration - why didn't the SRV record have a weight of 1 instead?) | |
1230 | ||
1231 | Arguments: | |
1232 | dnsa the DNS answer block | |
1233 | dnss a DNS scan block for us to use | |
4c04137d | 1234 | reset option specifying what portion to scan, as described above |
e5a9dba6 PH |
1235 | target the target hostname to use for matching RR names |
1236 | ||
1237 | Returns: CSA_OK successfully authorized | |
1238 | CSA_FAIL_MISMATCH addresses found but none matched | |
1239 | CSA_FAIL_NOADDR no target addresses found | |
1240 | */ | |
1241 | ||
1242 | static int | |
1243 | acl_verify_csa_address(dns_answer *dnsa, dns_scan *dnss, int reset, | |
1244 | uschar *target) | |
1245 | { | |
d7978c0f | 1246 | int rc = CSA_FAIL_NOADDR; |
e5a9dba6 | 1247 | |
d7978c0f JH |
1248 | for (dns_record * rr = dns_next_rr(dnsa, dnss, reset); |
1249 | rr; | |
e5a9dba6 PH |
1250 | rr = dns_next_rr(dnsa, dnss, RESET_NEXT)) |
1251 | { | |
1252 | /* Check this is an address RR for the target hostname. */ | |
1253 | ||
1254 | if (rr->type != T_A | |
1255 | #if HAVE_IPV6 | |
1256 | && rr->type != T_AAAA | |
e5a9dba6 PH |
1257 | #endif |
1258 | ) continue; | |
1259 | ||
1260 | if (strcmpic(target, rr->name) != 0) continue; | |
1261 | ||
d7978c0f | 1262 | rc = CSA_FAIL_MISMATCH; |
e5a9dba6 PH |
1263 | |
1264 | /* Turn the target address RR into a list of textual IP addresses and scan | |
1265 | the list. There may be more than one if it is an A6 RR. */ | |
1266 | ||
d7978c0f | 1267 | for (dns_address * da = dns_address_from_rr(dnsa, rr); da; da = da->next) |
e5a9dba6 PH |
1268 | { |
1269 | /* If the client IP address matches the target IP address, it's good! */ | |
1270 | ||
e1d04f48 | 1271 | DEBUG(D_acl) debug_printf_indent("CSA target address is %s\n", da->address); |
e5a9dba6 PH |
1272 | |
1273 | if (strcmpic(sender_host_address, da->address) == 0) return CSA_OK; | |
1274 | } | |
1275 | } | |
1276 | ||
1277 | /* If we found some target addresses but none of them matched, the client is | |
1278 | using an unauthorized IP address, otherwise the target has no authorized IP | |
1279 | addresses. */ | |
1280 | ||
d7978c0f | 1281 | return rc; |
e5a9dba6 PH |
1282 | } |
1283 | ||
1284 | ||
1285 | ||
1286 | /************************************************* | |
1287 | * Verify Client SMTP Authorization * | |
1288 | *************************************************/ | |
1289 | ||
1290 | /* Called from acl_verify() below. This routine calls dns_lookup_special() | |
1291 | to find the CSA SRV record corresponding to the domain argument, or | |
1292 | $sender_helo_name if no argument is provided. It then checks that the | |
1293 | client is authorized, and that its IP address corresponds to the SRV | |
1294 | target's address by calling acl_verify_csa_address() above. The address | |
1295 | should have been returned in the DNS response's ADDITIONAL section, but if | |
1296 | not we perform another DNS lookup to get it. | |
1297 | ||
1298 | Arguments: | |
1299 | domain pointer to optional parameter following verify = csa | |
1300 | ||
1301 | Returns: CSA_UNKNOWN no valid CSA record found | |
1302 | CSA_OK successfully authorized | |
1303 | CSA_FAIL_* client is definitely not authorized | |
1304 | CSA_DEFER_* there was a DNS problem | |
1305 | */ | |
1306 | ||
1307 | static int | |
55414b25 | 1308 | acl_verify_csa(const uschar *domain) |
e5a9dba6 PH |
1309 | { |
1310 | tree_node *t; | |
55414b25 | 1311 | const uschar *found; |
e5a9dba6 | 1312 | int priority, weight, port; |
8743d3ac | 1313 | dns_answer * dnsa = store_get_dns_answer(); |
e5a9dba6 PH |
1314 | dns_scan dnss; |
1315 | dns_record *rr; | |
1316 | int rc, type; | |
1317 | uschar target[256]; | |
1318 | ||
1319 | /* Work out the domain we are using for the CSA lookup. The default is the | |
1320 | client's HELO domain. If the client has not said HELO, use its IP address | |
1321 | instead. If it's a local client (exim -bs), CSA isn't applicable. */ | |
1322 | ||
1323 | while (isspace(*domain) && *domain != '\0') ++domain; | |
1324 | if (*domain == '\0') domain = sender_helo_name; | |
1325 | if (domain == NULL) domain = sender_host_address; | |
1326 | if (sender_host_address == NULL) return CSA_UNKNOWN; | |
1327 | ||
1328 | /* If we have an address literal, strip off the framing ready for turning it | |
1329 | into a domain. The framing consists of matched square brackets possibly | |
1330 | containing a keyword and a colon before the actual IP address. */ | |
1331 | ||
1332 | if (domain[0] == '[') | |
1333 | { | |
55414b25 | 1334 | const uschar *start = Ustrchr(domain, ':'); |
e5a9dba6 PH |
1335 | if (start == NULL) start = domain; |
1336 | domain = string_copyn(start + 1, Ustrlen(start) - 2); | |
1337 | } | |
1338 | ||
1339 | /* Turn domains that look like bare IP addresses into domains in the reverse | |
1340 | DNS. This code also deals with address literals and $sender_host_address. It's | |
1341 | not quite kosher to treat bare domains such as EHLO 192.0.2.57 the same as | |
1342 | address literals, but it's probably the most friendly thing to do. This is an | |
1343 | extension to CSA, so we allow it to be turned off for proper conformance. */ | |
1344 | ||
7e66e54d | 1345 | if (string_is_ip_address(domain, NULL) != 0) |
e5a9dba6 PH |
1346 | { |
1347 | if (!dns_csa_use_reverse) return CSA_UNKNOWN; | |
152481a0 | 1348 | domain = dns_build_reverse(domain); |
e5a9dba6 PH |
1349 | } |
1350 | ||
1351 | /* Find out if we've already done the CSA check for this domain. If we have, | |
1352 | return the same result again. Otherwise build a new cached result structure | |
1353 | for this domain. The name is filled in now, and the value is filled in when | |
1354 | we return from this function. */ | |
1355 | ||
1356 | t = tree_search(csa_cache, domain); | |
1357 | if (t != NULL) return t->data.val; | |
1358 | ||
f3ebb786 | 1359 | t = store_get_perm(sizeof(tree_node) + Ustrlen(domain), is_tainted(domain)); |
e5a9dba6 PH |
1360 | Ustrcpy(t->name, domain); |
1361 | (void)tree_insertnode(&csa_cache, t); | |
1362 | ||
1363 | /* Now we are ready to do the actual DNS lookup(s). */ | |
1364 | ||
28e6ef29 | 1365 | found = domain; |
8743d3ac | 1366 | switch (dns_special_lookup(dnsa, domain, T_CSA, &found)) |
e5a9dba6 PH |
1367 | { |
1368 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1369 | ||
1370 | default: | |
1371 | return t->data.val = CSA_DEFER_SRV; | |
1372 | ||
1373 | /* If we found nothing, the client's authorization is unknown. */ | |
1374 | ||
1375 | case DNS_NOMATCH: | |
1376 | case DNS_NODATA: | |
1377 | return t->data.val = CSA_UNKNOWN; | |
1378 | ||
1379 | /* We got something! Go on to look at the reply in more detail. */ | |
1380 | ||
1381 | case DNS_SUCCEED: | |
1382 | break; | |
1383 | } | |
1384 | ||
1385 | /* Scan the reply for well-formed CSA SRV records. */ | |
1386 | ||
8743d3ac | 1387 | for (rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS); |
dd708fd7 | 1388 | rr; |
8743d3ac | 1389 | rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)) if (rr->type == T_SRV) |
e5a9dba6 | 1390 | { |
dd708fd7 | 1391 | const uschar * p = rr->data; |
e5a9dba6 PH |
1392 | |
1393 | /* Extract the numerical SRV fields (p is incremented) */ | |
1394 | ||
e5a9dba6 PH |
1395 | GETSHORT(priority, p); |
1396 | GETSHORT(weight, p); | |
1397 | GETSHORT(port, p); | |
1398 | ||
1399 | DEBUG(D_acl) | |
e1d04f48 | 1400 | debug_printf_indent("CSA priority=%d weight=%d port=%d\n", priority, weight, port); |
e5a9dba6 PH |
1401 | |
1402 | /* Check the CSA version number */ | |
1403 | ||
1404 | if (priority != 1) continue; | |
1405 | ||
1406 | /* If the domain does not have a CSA SRV record of its own (i.e. the domain | |
1407 | found by dns_special_lookup() is a parent of the one we asked for), we check | |
1408 | the subdomain assertions in the port field. At the moment there's only one | |
1409 | assertion: legitimate SMTP clients are all explicitly authorized with CSA | |
1410 | SRV records of their own. */ | |
1411 | ||
1dc92d5a | 1412 | if (Ustrcmp(found, domain) != 0) |
dd708fd7 | 1413 | return t->data.val = port & 1 ? CSA_FAIL_EXPLICIT : CSA_UNKNOWN; |
e5a9dba6 PH |
1414 | |
1415 | /* This CSA SRV record refers directly to our domain, so we check the value | |
1416 | in the weight field to work out the domain's authorization. 0 and 1 are | |
1417 | unauthorized; 3 means the client is authorized but we can't check the IP | |
1418 | address in order to authenticate it, so we treat it as unknown; values | |
1419 | greater than 3 are undefined. */ | |
1420 | ||
1421 | if (weight < 2) return t->data.val = CSA_FAIL_DOMAIN; | |
1422 | ||
1423 | if (weight > 2) continue; | |
1424 | ||
1425 | /* Weight == 2, which means the domain is authorized. We must check that the | |
1426 | client's IP address is listed as one of the SRV target addresses. Save the | |
1427 | target hostname then break to scan the additional data for its addresses. */ | |
1428 | ||
8743d3ac | 1429 | (void)dn_expand(dnsa->answer, dnsa->answer + dnsa->answerlen, p, |
e5a9dba6 PH |
1430 | (DN_EXPAND_ARG4_TYPE)target, sizeof(target)); |
1431 | ||
e1d04f48 | 1432 | DEBUG(D_acl) debug_printf_indent("CSA target is %s\n", target); |
e5a9dba6 PH |
1433 | |
1434 | break; | |
1435 | } | |
1436 | ||
1437 | /* If we didn't break the loop then no appropriate records were found. */ | |
1438 | ||
d7978c0f | 1439 | if (!rr) return t->data.val = CSA_UNKNOWN; |
e5a9dba6 PH |
1440 | |
1441 | /* Do not check addresses if the target is ".", in accordance with RFC 2782. | |
1442 | A target of "." indicates there are no valid addresses, so the client cannot | |
1443 | be authorized. (This is an odd configuration because weight=2 target=. is | |
1444 | equivalent to weight=1, but we check for it in order to keep load off the | |
1445 | root name servers.) Note that dn_expand() turns "." into "". */ | |
1446 | ||
1447 | if (Ustrcmp(target, "") == 0) return t->data.val = CSA_FAIL_NOADDR; | |
1448 | ||
1449 | /* Scan the additional section of the CSA SRV reply for addresses belonging | |
1450 | to the target. If the name server didn't return any additional data (e.g. | |
1451 | because it does not fully support SRV records), we need to do another lookup | |
1452 | to obtain the target addresses; otherwise we have a definitive result. */ | |
1453 | ||
8743d3ac | 1454 | rc = acl_verify_csa_address(dnsa, &dnss, RESET_ADDITIONAL, target); |
e5a9dba6 PH |
1455 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; |
1456 | ||
1457 | /* The DNS lookup type corresponds to the IP version used by the client. */ | |
1458 | ||
1459 | #if HAVE_IPV6 | |
1460 | if (Ustrchr(sender_host_address, ':') != NULL) | |
1461 | type = T_AAAA; | |
1462 | else | |
1463 | #endif /* HAVE_IPV6 */ | |
1464 | type = T_A; | |
1465 | ||
1466 | ||
4e0983dc | 1467 | lookup_dnssec_authenticated = NULL; |
8743d3ac | 1468 | switch (dns_lookup(dnsa, target, type, NULL)) |
e5a9dba6 PH |
1469 | { |
1470 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1471 | ||
1472 | default: | |
cc00f4af | 1473 | return t->data.val = CSA_DEFER_ADDR; |
e5a9dba6 PH |
1474 | |
1475 | /* If the query succeeded, scan the addresses and return the result. */ | |
1476 | ||
1477 | case DNS_SUCCEED: | |
8743d3ac | 1478 | rc = acl_verify_csa_address(dnsa, &dnss, RESET_ANSWERS, target); |
cc00f4af JH |
1479 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; |
1480 | /* else fall through */ | |
e5a9dba6 PH |
1481 | |
1482 | /* If the target has no IP addresses, the client cannot have an authorized | |
1483 | IP address. However, if the target site uses A6 records (not AAAA records) | |
1484 | we have to do yet another lookup in order to check them. */ | |
1485 | ||
1486 | case DNS_NOMATCH: | |
1487 | case DNS_NODATA: | |
cc00f4af | 1488 | return t->data.val = CSA_FAIL_NOADDR; |
e5a9dba6 PH |
1489 | } |
1490 | } | |
1491 | ||
1492 | ||
1493 | ||
059ec3d9 PH |
1494 | /************************************************* |
1495 | * Handle verification (address & other) * | |
1496 | *************************************************/ | |
1497 | ||
89583014 | 1498 | enum { VERIFY_REV_HOST_LKUP, VERIFY_CERT, VERIFY_HELO, VERIFY_CSA, VERIFY_HDR_SYNTAX, |
770747fd | 1499 | VERIFY_NOT_BLIND, VERIFY_HDR_SNDR, VERIFY_SNDR, VERIFY_RCPT, |
e3a69b62 | 1500 | VERIFY_HDR_NAMES_ASCII, VERIFY_ARC |
89583014 JH |
1501 | }; |
1502 | typedef struct { | |
1503 | uschar * name; | |
1504 | int value; | |
1505 | unsigned where_allowed; /* bitmap */ | |
1506 | BOOL no_options; /* Never has /option(s) following */ | |
1507 | unsigned alt_opt_sep; /* >0 Non-/ option separator (custom parser) */ | |
1508 | } verify_type_t; | |
1509 | static verify_type_t verify_type_list[] = { | |
6d95688d JH |
1510 | /* name value where no-opt opt-sep */ |
1511 | { US"reverse_host_lookup", VERIFY_REV_HOST_LKUP, (unsigned)~0, FALSE, 0 }, | |
1512 | { US"certificate", VERIFY_CERT, (unsigned)~0, TRUE, 0 }, | |
1513 | { US"helo", VERIFY_HELO, (unsigned)~0, TRUE, 0 }, | |
1514 | { US"csa", VERIFY_CSA, (unsigned)~0, FALSE, 0 }, | |
e3a69b62 | 1515 | { US"header_syntax", VERIFY_HDR_SYNTAX, ACL_BIT_DATA | ACL_BIT_NOTSMTP, TRUE, 0 }, |
7c498df1 | 1516 | { US"not_blind", VERIFY_NOT_BLIND, ACL_BIT_DATA | ACL_BIT_NOTSMTP, FALSE, 0 }, |
e3a69b62 JH |
1517 | { US"header_sender", VERIFY_HDR_SNDR, ACL_BIT_DATA | ACL_BIT_NOTSMTP, FALSE, 0 }, |
1518 | { US"sender", VERIFY_SNDR, ACL_BIT_MAIL | ACL_BIT_RCPT | |
1519 | |ACL_BIT_PREDATA | ACL_BIT_DATA | ACL_BIT_NOTSMTP, | |
89583014 | 1520 | FALSE, 6 }, |
e3a69b62 JH |
1521 | { US"recipient", VERIFY_RCPT, ACL_BIT_RCPT, FALSE, 0 }, |
1522 | { US"header_names_ascii", VERIFY_HDR_NAMES_ASCII, ACL_BIT_DATA | ACL_BIT_NOTSMTP, TRUE, 0 }, | |
1523 | #ifdef EXPERIMENTAL_ARC | |
f48946eb | 1524 | { US"arc", VERIFY_ARC, ACL_BIT_DATA, FALSE , 0 }, |
e3a69b62 | 1525 | #endif |
89583014 JH |
1526 | }; |
1527 | ||
1528 | ||
1529 | enum { CALLOUT_DEFER_OK, CALLOUT_NOCACHE, CALLOUT_RANDOM, CALLOUT_USE_SENDER, | |
1530 | CALLOUT_USE_POSTMASTER, CALLOUT_POSTMASTER, CALLOUT_FULLPOSTMASTER, | |
1531 | CALLOUT_MAILFROM, CALLOUT_POSTMASTER_MAILFROM, CALLOUT_MAXWAIT, CALLOUT_CONNECT, | |
57cc2785 | 1532 | CALLOUT_HOLD, CALLOUT_TIME /* TIME must be last */ |
89583014 JH |
1533 | }; |
1534 | typedef struct { | |
1535 | uschar * name; | |
1536 | int value; | |
1537 | int flag; | |
1538 | BOOL has_option; /* Has =option(s) following */ | |
1539 | BOOL timeval; /* Has a time value */ | |
1540 | } callout_opt_t; | |
1541 | static callout_opt_t callout_opt_list[] = { | |
f2ed27cf | 1542 | /* name value flag has-opt has-time */ |
89583014 JH |
1543 | { US"defer_ok", CALLOUT_DEFER_OK, 0, FALSE, FALSE }, |
1544 | { US"no_cache", CALLOUT_NOCACHE, vopt_callout_no_cache, FALSE, FALSE }, | |
1545 | { US"random", CALLOUT_RANDOM, vopt_callout_random, FALSE, FALSE }, | |
1546 | { US"use_sender", CALLOUT_USE_SENDER, vopt_callout_recipsender, FALSE, FALSE }, | |
1547 | { US"use_postmaster", CALLOUT_USE_POSTMASTER,vopt_callout_recippmaster, FALSE, FALSE }, | |
1548 | { US"postmaster_mailfrom",CALLOUT_POSTMASTER_MAILFROM,0, TRUE, FALSE }, | |
1549 | { US"postmaster", CALLOUT_POSTMASTER, 0, FALSE, FALSE }, | |
1550 | { US"fullpostmaster", CALLOUT_FULLPOSTMASTER,vopt_callout_fullpm, FALSE, FALSE }, | |
1551 | { US"mailfrom", CALLOUT_MAILFROM, 0, TRUE, FALSE }, | |
1552 | { US"maxwait", CALLOUT_MAXWAIT, 0, TRUE, TRUE }, | |
1553 | { US"connect", CALLOUT_CONNECT, 0, TRUE, TRUE }, | |
57cc2785 | 1554 | { US"hold", CALLOUT_HOLD, vopt_callout_hold, FALSE, FALSE }, |
89583014 JH |
1555 | { NULL, CALLOUT_TIME, 0, FALSE, TRUE } |
1556 | }; | |
1557 | ||
1558 | ||
1559 | ||
059ec3d9 PH |
1560 | /* This function implements the "verify" condition. It is called when |
1561 | encountered in any ACL, because some tests are almost always permitted. Some | |
1562 | just don't make sense, and always fail (for example, an attempt to test a host | |
1563 | lookup for a non-TCP/IP message). Others are restricted to certain ACLs. | |
1564 | ||
1565 | Arguments: | |
1566 | where where called from | |
1567 | addr the recipient address that the ACL is handling, or NULL | |
1568 | arg the argument of "verify" | |
1569 | user_msgptr pointer for user message | |
1570 | log_msgptr pointer for log message | |
1571 | basic_errno where to put verify errno | |
1572 | ||
1573 | Returns: OK verification condition succeeded | |
1574 | FAIL verification failed | |
1575 | DEFER there was a problem verifying | |
1576 | ERROR syntax error | |
1577 | */ | |
1578 | ||
1579 | static int | |
55414b25 | 1580 | acl_verify(int where, address_item *addr, const uschar *arg, |
059ec3d9 PH |
1581 | uschar **user_msgptr, uschar **log_msgptr, int *basic_errno) |
1582 | { | |
1583 | int sep = '/'; | |
1584 | int callout = -1; | |
1585 | int callout_overall = -1; | |
4deaf07d | 1586 | int callout_connect = -1; |
059ec3d9 PH |
1587 | int verify_options = 0; |
1588 | int rc; | |
1589 | BOOL verify_header_sender = FALSE; | |
1590 | BOOL defer_ok = FALSE; | |
1591 | BOOL callout_defer_ok = FALSE; | |
1592 | BOOL no_details = FALSE; | |
eafd343b | 1593 | BOOL success_on_redirect = FALSE; |
059ec3d9 PH |
1594 | address_item *sender_vaddr = NULL; |
1595 | uschar *verify_sender_address = NULL; | |
1596 | uschar *pm_mailfrom = NULL; | |
1597 | uschar *se_mailfrom = NULL; | |
596875b3 PH |
1598 | |
1599 | /* Some of the verify items have slash-separated options; some do not. Diagnose | |
89583014 | 1600 | an error if options are given for items that don't expect them. |
596875b3 PH |
1601 | */ |
1602 | ||
1603 | uschar *slash = Ustrchr(arg, '/'); | |
55414b25 | 1604 | const uschar *list = arg; |
059ec3d9 | 1605 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); |
89583014 | 1606 | verify_type_t * vp; |
059ec3d9 | 1607 | |
e3a69b62 | 1608 | if (!ss) goto BAD_VERIFY; |
059ec3d9 PH |
1609 | |
1610 | /* Handle name/address consistency verification in a separate function. */ | |
1611 | ||
d7978c0f | 1612 | for (vp = verify_type_list; |
5903c6ff | 1613 | CS vp < CS verify_type_list + sizeof(verify_type_list); |
89583014 JH |
1614 | vp++ |
1615 | ) | |
1616 | if (vp->alt_opt_sep ? strncmpic(ss, vp->name, vp->alt_opt_sep) == 0 | |
1617 | : strcmpic (ss, vp->name) == 0) | |
1618 | break; | |
5903c6ff | 1619 | if (CS vp >= CS verify_type_list + sizeof(verify_type_list)) |
89583014 JH |
1620 | goto BAD_VERIFY; |
1621 | ||
e3a69b62 | 1622 | if (vp->no_options && slash) |
059ec3d9 | 1623 | { |
89583014 JH |
1624 | *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" " |
1625 | "(this verify item has no options)", arg); | |
1626 | return ERROR; | |
059ec3d9 | 1627 | } |
e3a69b62 | 1628 | if (!(vp->where_allowed & BIT(where))) |
059ec3d9 | 1629 | { |
e3a69b62 JH |
1630 | *log_msgptr = string_sprintf("cannot verify %s in ACL for %s", |
1631 | vp->name, acl_wherenames[where]); | |
89583014 | 1632 | return ERROR; |
059ec3d9 | 1633 | } |
89583014 | 1634 | switch(vp->value) |
596875b3 | 1635 | { |
89583014 | 1636 | case VERIFY_REV_HOST_LKUP: |
617d3932 | 1637 | if (!sender_host_address) return OK; |
7e8360e6 | 1638 | if ((rc = acl_verify_reverse(user_msgptr, log_msgptr)) == DEFER) |
617d3932 | 1639 | while ((ss = string_nextinlist(&list, &sep, NULL, 0))) |
7e8360e6 JH |
1640 | if (strcmpic(ss, US"defer_ok") == 0) |
1641 | return OK; | |
1642 | return rc; | |
059ec3d9 | 1643 | |
89583014 JH |
1644 | case VERIFY_CERT: |
1645 | /* TLS certificate verification is done at STARTTLS time; here we just | |
1646 | test whether it was successful or not. (This is for optional verification; for | |
1647 | mandatory verification, the connection doesn't last this long.) */ | |
e5a9dba6 | 1648 | |
3703d818 JH |
1649 | if (tls_in.certificate_verified) return OK; |
1650 | *user_msgptr = US"no verified certificate"; | |
1651 | return FAIL; | |
e5a9dba6 | 1652 | |
89583014 JH |
1653 | case VERIFY_HELO: |
1654 | /* We can test the result of optional HELO verification that might have | |
1655 | occurred earlier. If not, we can attempt the verification now. */ | |
059ec3d9 | 1656 | |
8768d548 JH |
1657 | if (!f.helo_verified && !f.helo_verify_failed) smtp_verify_helo(); |
1658 | return f.helo_verified ? OK : FAIL; | |
059ec3d9 | 1659 | |
89583014 JH |
1660 | case VERIFY_CSA: |
1661 | /* Do Client SMTP Authorization checks in a separate function, and turn the | |
1662 | result code into user-friendly strings. */ | |
1c41c9cc | 1663 | |
3703d818 JH |
1664 | rc = acl_verify_csa(list); |
1665 | *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s", | |
89583014 | 1666 | csa_reason_string[rc]); |
3703d818 | 1667 | csa_status = csa_status_string[rc]; |
e1d04f48 | 1668 | DEBUG(D_acl) debug_printf_indent("CSA result %s\n", csa_status); |
3703d818 | 1669 | return csa_return_code[rc]; |
89583014 | 1670 | |
617d3932 JH |
1671 | #ifdef EXPERIMENTAL_ARC |
1672 | case VERIFY_ARC: | |
1673 | { /* Do Authenticated Received Chain checks in a separate function. */ | |
1674 | const uschar * condlist = CUS string_nextinlist(&list, &sep, NULL, 0); | |
1675 | int csep = 0; | |
1676 | uschar * cond; | |
1677 | ||
1678 | if (!(arc_state = acl_verify_arc())) return DEFER; | |
93c931f8 JH |
1679 | DEBUG(D_acl) debug_printf_indent("ARC verify result %s %s%s%s\n", arc_state, |
1680 | arc_state_reason ? "(":"", arc_state_reason, arc_state_reason ? ")":""); | |
617d3932 JH |
1681 | |
1682 | if (!condlist) condlist = US"none:pass"; | |
1683 | while ((cond = string_nextinlist(&condlist, &csep, NULL, 0))) | |
1684 | if (Ustrcmp(arc_state, cond) == 0) return OK; | |
1685 | return FAIL; | |
1686 | } | |
1687 | #endif | |
1688 | ||
89583014 | 1689 | case VERIFY_HDR_SYNTAX: |
db57e575 | 1690 | /* Check that all relevant header lines have the correct 5322-syntax. If there is |
89583014 JH |
1691 | a syntax error, we return details of the error to the sender if configured to |
1692 | send out full details. (But a "message" setting on the ACL can override, as | |
1693 | always). */ | |
1694 | ||
1695 | rc = verify_check_headers(log_msgptr); | |
3703d818 JH |
1696 | if (rc != OK && *log_msgptr) |
1697 | if (smtp_return_error_details) | |
1698 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1699 | else | |
1700 | acl_verify_message = *log_msgptr; | |
89583014 | 1701 | return rc; |
059ec3d9 | 1702 | |
770747fd MFM |
1703 | case VERIFY_HDR_NAMES_ASCII: |
1704 | /* Check that all header names are true 7 bit strings | |
1705 | See RFC 5322, 2.2. and RFC 6532, 3. */ | |
1706 | ||
1707 | rc = verify_check_header_names_ascii(log_msgptr); | |
617d3932 | 1708 | if (rc != OK && smtp_return_error_details && *log_msgptr) |
770747fd MFM |
1709 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); |
1710 | return rc; | |
1711 | ||
89583014 JH |
1712 | case VERIFY_NOT_BLIND: |
1713 | /* Check that no recipient of this message is "blind", that is, every envelope | |
1714 | recipient must be mentioned in either To: or Cc:. */ | |
7c498df1 SA |
1715 | { |
1716 | BOOL case_sensitive = TRUE; | |
1717 | ||
1718 | while ((ss = string_nextinlist(&list, &sep, NULL, 0))) | |
1719 | if (strcmpic(ss, US"case_insensitive") == 0) | |
1720 | case_sensitive = FALSE; | |
1721 | else | |
1722 | { | |
1723 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " | |
1724 | "condition \"verify %s\"", ss, arg); | |
1725 | return ERROR; | |
1726 | } | |
059ec3d9 | 1727 | |
7c498df1 | 1728 | if ((rc = verify_check_notblind(case_sensitive)) != OK) |
89583014 | 1729 | { |
f3ebb786 | 1730 | *log_msgptr = US"bcc recipient detected"; |
89583014 JH |
1731 | if (smtp_return_error_details) |
1732 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1733 | } | |
1734 | return rc; | |
7c498df1 | 1735 | } |
059ec3d9 | 1736 | |
89583014 JH |
1737 | /* The remaining verification tests check recipient and sender addresses, |
1738 | either from the envelope or from the header. There are a number of | |
1739 | slash-separated options that are common to all of them. */ | |
059ec3d9 | 1740 | |
89583014 JH |
1741 | case VERIFY_HDR_SNDR: |
1742 | verify_header_sender = TRUE; | |
1743 | break; | |
059ec3d9 | 1744 | |
89583014 JH |
1745 | case VERIFY_SNDR: |
1746 | /* In the case of a sender, this can optionally be followed by an address to use | |
1747 | in place of the actual sender (rare special-case requirement). */ | |
059ec3d9 | 1748 | { |
89583014 JH |
1749 | uschar *s = ss + 6; |
1750 | if (*s == 0) | |
1751 | verify_sender_address = sender_address; | |
1752 | else | |
1753 | { | |
1754 | while (isspace(*s)) s++; | |
1755 | if (*s++ != '=') goto BAD_VERIFY; | |
1756 | while (isspace(*s)) s++; | |
1757 | verify_sender_address = string_copy(s); | |
1758 | } | |
059ec3d9 | 1759 | } |
89583014 JH |
1760 | break; |
1761 | ||
1762 | case VERIFY_RCPT: | |
1763 | break; | |
059ec3d9 PH |
1764 | } |
1765 | ||
89583014 JH |
1766 | |
1767 | ||
596875b3 PH |
1768 | /* Remaining items are optional; they apply to sender and recipient |
1769 | verification, including "header sender" verification. */ | |
059ec3d9 | 1770 | |
d7978c0f | 1771 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) |
059ec3d9 PH |
1772 | { |
1773 | if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE; | |
1774 | else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE; | |
eafd343b | 1775 | else if (strcmpic(ss, US"success_on_redirect") == 0) success_on_redirect = TRUE; |
059ec3d9 PH |
1776 | |
1777 | /* These two old options are left for backwards compatibility */ | |
1778 | ||
1779 | else if (strcmpic(ss, US"callout_defer_ok") == 0) | |
1780 | { | |
1781 | callout_defer_ok = TRUE; | |
1782 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1783 | } | |
1784 | ||
1785 | else if (strcmpic(ss, US"check_postmaster") == 0) | |
1786 | { | |
1787 | pm_mailfrom = US""; | |
1788 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1789 | } | |
1790 | ||
1791 | /* The callout option has a number of sub-options, comma separated */ | |
1792 | ||
1793 | else if (strncmpic(ss, US"callout", 7) == 0) | |
1794 | { | |
1795 | callout = CALLOUT_TIMEOUT_DEFAULT; | |
1796 | ss += 7; | |
1797 | if (*ss != 0) | |
1798 | { | |
1799 | while (isspace(*ss)) ss++; | |
1800 | if (*ss++ == '=') | |
1801 | { | |
55414b25 | 1802 | const uschar * sublist = ss; |
059ec3d9 | 1803 | int optsep = ','; |
059ec3d9 | 1804 | uschar buffer[256]; |
d7978c0f | 1805 | uschar * opt; |
8e669ac1 | 1806 | |
d7978c0f | 1807 | while (isspace(*sublist)) sublist++; |
57cc2785 | 1808 | while ((opt = string_nextinlist(&sublist, &optsep, buffer, sizeof(buffer)))) |
059ec3d9 | 1809 | { |
89583014 | 1810 | callout_opt_t * op; |
438257ba | 1811 | double period = 1.0F; |
059ec3d9 | 1812 | |
89583014 | 1813 | for (op= callout_opt_list; op->name; op++) |
438257ba | 1814 | if (strncmpic(opt, op->name, Ustrlen(op->name)) == 0) |
89583014 | 1815 | break; |
059ec3d9 | 1816 | |
89583014 JH |
1817 | verify_options |= op->flag; |
1818 | if (op->has_option) | |
1819 | { | |
438257ba | 1820 | opt += Ustrlen(op->name); |
4deaf07d PH |
1821 | while (isspace(*opt)) opt++; |
1822 | if (*opt++ != '=') | |
1823 | { | |
1824 | *log_msgptr = string_sprintf("'=' expected after " | |
89583014 | 1825 | "\"%s\" in ACL verify condition \"%s\"", op->name, arg); |
4deaf07d PH |
1826 | return ERROR; |
1827 | } | |
1828 | while (isspace(*opt)) opt++; | |
89583014 | 1829 | } |
57cc2785 | 1830 | if (op->timeval && (period = readconf_readtime(opt, 0, FALSE)) < 0) |
89583014 | 1831 | { |
57cc2785 JH |
1832 | *log_msgptr = string_sprintf("bad time value in ACL condition " |
1833 | "\"verify %s\"", arg); | |
1834 | return ERROR; | |
89583014 JH |
1835 | } |
1836 | ||
1837 | switch(op->value) | |
1838 | { | |
1839 | case CALLOUT_DEFER_OK: callout_defer_ok = TRUE; break; | |
1840 | case CALLOUT_POSTMASTER: pm_mailfrom = US""; break; | |
1841 | case CALLOUT_FULLPOSTMASTER: pm_mailfrom = US""; break; | |
1842 | case CALLOUT_MAILFROM: | |
1843 | if (!verify_header_sender) | |
1844 | { | |
1845 | *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a " | |
1846 | "callout option only for verify=header_sender (detected in ACL " | |
1847 | "condition \"%s\")", arg); | |
1848 | return ERROR; | |
1849 | } | |
1850 | se_mailfrom = string_copy(opt); | |
1851 | break; | |
1852 | case CALLOUT_POSTMASTER_MAILFROM: pm_mailfrom = string_copy(opt); break; | |
1853 | case CALLOUT_MAXWAIT: callout_overall = period; break; | |
1854 | case CALLOUT_CONNECT: callout_connect = period; break; | |
1855 | case CALLOUT_TIME: callout = period; break; | |
1856 | } | |
059ec3d9 PH |
1857 | } |
1858 | } | |
1859 | else | |
1860 | { | |
1861 | *log_msgptr = string_sprintf("'=' expected after \"callout\" in " | |
1862 | "ACL condition \"%s\"", arg); | |
1863 | return ERROR; | |
1864 | } | |
1865 | } | |
1866 | } | |
1867 | ||
1868 | /* Option not recognized */ | |
1869 | ||
1870 | else | |
1871 | { | |
1872 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " | |
1873 | "condition \"verify %s\"", ss, arg); | |
1874 | return ERROR; | |
1875 | } | |
1876 | } | |
1877 | ||
1878 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == | |
1879 | (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1880 | { | |
1881 | *log_msgptr = US"only one of use_sender and use_postmaster can be set " | |
1882 | "for a recipient callout"; | |
1883 | return ERROR; | |
1884 | } | |
1885 | ||
1886 | /* Handle sender-in-header verification. Default the user message to the log | |
1887 | message if giving out verification details. */ | |
1888 | ||
1889 | if (verify_header_sender) | |
1890 | { | |
8e669ac1 | 1891 | int verrno; |
2f682e45 JH |
1892 | |
1893 | if ((rc = verify_check_header_address(user_msgptr, log_msgptr, callout, | |
fe5b5d0b | 1894 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, verify_options, |
2f682e45 | 1895 | &verrno)) != OK) |
8e669ac1 | 1896 | { |
fe5b5d0b PH |
1897 | *basic_errno = verrno; |
1898 | if (smtp_return_error_details) | |
1899 | { | |
2f682e45 | 1900 | if (!*user_msgptr && *log_msgptr) |
fe5b5d0b | 1901 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); |
8768d548 | 1902 | if (rc == DEFER) f.acl_temp_details = TRUE; |
fe5b5d0b | 1903 | } |
8e669ac1 | 1904 | } |
059ec3d9 PH |
1905 | } |
1906 | ||
1907 | /* Handle a sender address. The default is to verify *the* sender address, but | |
1908 | optionally a different address can be given, for special requirements. If the | |
1909 | address is empty, we are dealing with a bounce message that has no sender, so | |
1910 | we cannot do any checking. If the real sender address gets rewritten during | |
1911 | verification (e.g. DNS widening), set the flag to stop it being rewritten again | |
1912 | during message reception. | |
1913 | ||
1914 | A list of verified "sender" addresses is kept to try to avoid doing to much | |
1915 | work repetitively when there are multiple recipients in a message and they all | |
1916 | require sender verification. However, when callouts are involved, it gets too | |
1917 | complicated because different recipients may require different callout options. | |
1918 | Therefore, we always do a full sender verify when any kind of callout is | |
1919 | specified. Caching elsewhere, for instance in the DNS resolver and in the | |
1920 | callout handling, should ensure that this is not terribly inefficient. */ | |
1921 | ||
2f682e45 | 1922 | else if (verify_sender_address) |
059ec3d9 | 1923 | { |
2f682e45 | 1924 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster))) |
059ec3d9 PH |
1925 | { |
1926 | *log_msgptr = US"use_sender or use_postmaster cannot be used for a " | |
1927 | "sender verify callout"; | |
1928 | return ERROR; | |
1929 | } | |
1930 | ||
1931 | sender_vaddr = verify_checked_sender(verify_sender_address); | |
1932 | if (sender_vaddr != NULL && /* Previously checked */ | |
1933 | callout <= 0) /* No callout needed this time */ | |
1934 | { | |
1935 | /* If the "routed" flag is set, it means that routing worked before, so | |
1936 | this check can give OK (the saved return code value, if set, belongs to a | |
1937 | callout that was done previously). If the "routed" flag is not set, routing | |
1938 | must have failed, so we use the saved return code. */ | |
1939 | ||
2f682e45 JH |
1940 | if (testflag(sender_vaddr, af_verify_routed)) |
1941 | rc = OK; | |
1942 | else | |
059ec3d9 PH |
1943 | { |
1944 | rc = sender_vaddr->special_action; | |
1945 | *basic_errno = sender_vaddr->basic_errno; | |
1946 | } | |
e1d04f48 | 1947 | HDEBUG(D_acl) debug_printf_indent("using cached sender verify result\n"); |
059ec3d9 PH |
1948 | } |
1949 | ||
1950 | /* Do a new verification, and cache the result. The cache is used to avoid | |
1951 | verifying the sender multiple times for multiple RCPTs when callouts are not | |
1952 | specified (see comments above). | |
1953 | ||
1954 | The cache is also used on failure to give details in response to the first | |
1955 | RCPT that gets bounced for this reason. However, this can be suppressed by | |
1956 | the no_details option, which sets the flag that says "this detail has already | |
1957 | been sent". The cache normally contains just one address, but there may be | |
1958 | more in esoteric circumstances. */ | |
1959 | ||
1960 | else | |
1961 | { | |
1962 | BOOL routed = TRUE; | |
2a3eea10 | 1963 | uschar *save_address_data = deliver_address_data; |
8e669ac1 | 1964 | |
059ec3d9 | 1965 | sender_vaddr = deliver_make_addr(verify_sender_address, TRUE); |
8c5d388a | 1966 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
1967 | if ((sender_vaddr->prop.utf8_msg = message_smtputf8)) |
1968 | { | |
1969 | sender_vaddr->prop.utf8_downcvt = message_utf8_downconvert == 1; | |
1970 | sender_vaddr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1; | |
1971 | } | |
f358d5e0 | 1972 | #endif |
059ec3d9 PH |
1973 | if (no_details) setflag(sender_vaddr, af_sverify_told); |
1974 | if (verify_sender_address[0] != 0) | |
1975 | { | |
1976 | /* If this is the real sender address, save the unrewritten version | |
1977 | for use later in receive. Otherwise, set a flag so that rewriting the | |
1978 | sender in verify_address() does not update sender_address. */ | |
1979 | ||
1980 | if (verify_sender_address == sender_address) | |
1981 | sender_address_unrewritten = sender_address; | |
1982 | else | |
1983 | verify_options |= vopt_fake_sender; | |
1984 | ||
eafd343b TK |
1985 | if (success_on_redirect) |
1986 | verify_options |= vopt_success_on_redirect; | |
1987 | ||
059ec3d9 PH |
1988 | /* The recipient, qualify, and expn options are never set in |
1989 | verify_options. */ | |
1990 | ||
1991 | rc = verify_address(sender_vaddr, NULL, verify_options, callout, | |
4deaf07d | 1992 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, &routed); |
059ec3d9 | 1993 | |
e1d04f48 | 1994 | HDEBUG(D_acl) debug_printf_indent("----------- end verify ------------\n"); |
059ec3d9 | 1995 | |
2f682e45 JH |
1996 | if (rc != OK) |
1997 | *basic_errno = sender_vaddr->basic_errno; | |
1998 | else | |
1999 | DEBUG(D_acl) | |
2000 | { | |
2001 | if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0) | |
e1d04f48 | 2002 | debug_printf_indent("sender %s verified ok as %s\n", |
2f682e45 JH |
2003 | verify_sender_address, sender_vaddr->address); |
2004 | else | |
e1d04f48 | 2005 | debug_printf_indent("sender %s verified ok\n", |
2f682e45 JH |
2006 | verify_sender_address); |
2007 | } | |
059ec3d9 | 2008 | } |
2f682e45 JH |
2009 | else |
2010 | rc = OK; /* Null sender */ | |
059ec3d9 PH |
2011 | |
2012 | /* Cache the result code */ | |
2013 | ||
2014 | if (routed) setflag(sender_vaddr, af_verify_routed); | |
2015 | if (callout > 0) setflag(sender_vaddr, af_verify_callout); | |
2016 | sender_vaddr->special_action = rc; | |
2017 | sender_vaddr->next = sender_verified_list; | |
2018 | sender_verified_list = sender_vaddr; | |
8e669ac1 PH |
2019 | |
2020 | /* Restore the recipient address data, which might have been clobbered by | |
2a3eea10 | 2021 | the sender verification. */ |
8e669ac1 | 2022 | |
2a3eea10 | 2023 | deliver_address_data = save_address_data; |
059ec3d9 | 2024 | } |
8e669ac1 | 2025 | |
2a3eea10 PH |
2026 | /* Put the sender address_data value into $sender_address_data */ |
2027 | ||
d43cbe25 | 2028 | sender_address_data = sender_vaddr->prop.address_data; |
059ec3d9 PH |
2029 | } |
2030 | ||
2031 | /* A recipient address just gets a straightforward verify; again we must handle | |
2032 | the DEFER overrides. */ | |
2033 | ||
2034 | else | |
2035 | { | |
2036 | address_item addr2; | |
2037 | ||
eafd343b TK |
2038 | if (success_on_redirect) |
2039 | verify_options |= vopt_success_on_redirect; | |
2040 | ||
059ec3d9 PH |
2041 | /* We must use a copy of the address for verification, because it might |
2042 | get rewritten. */ | |
2043 | ||
2044 | addr2 = *addr; | |
2045 | rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout, | |
4deaf07d | 2046 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, NULL); |
e1d04f48 | 2047 | HDEBUG(D_acl) debug_printf_indent("----------- end verify ------------\n"); |
8e669ac1 | 2048 | |
42855d71 | 2049 | *basic_errno = addr2.basic_errno; |
059ec3d9 | 2050 | *log_msgptr = addr2.message; |
8e669ac1 | 2051 | *user_msgptr = (addr2.user_message != NULL)? |
6729cf78 | 2052 | addr2.user_message : addr2.message; |
42855d71 PH |
2053 | |
2054 | /* Allow details for temporary error if the address is so flagged. */ | |
8768d548 | 2055 | if (testflag((&addr2), af_pass_message)) f.acl_temp_details = TRUE; |
059ec3d9 PH |
2056 | |
2057 | /* Make $address_data visible */ | |
d43cbe25 | 2058 | deliver_address_data = addr2.prop.address_data; |
059ec3d9 PH |
2059 | } |
2060 | ||
2061 | /* We have a result from the relevant test. Handle defer overrides first. */ | |
2062 | ||
2063 | if (rc == DEFER && (defer_ok || | |
2064 | (callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER))) | |
2065 | { | |
e1d04f48 | 2066 | HDEBUG(D_acl) debug_printf_indent("verify defer overridden by %s\n", |
059ec3d9 PH |
2067 | defer_ok? "defer_ok" : "callout_defer_ok"); |
2068 | rc = OK; | |
2069 | } | |
2070 | ||
2071 | /* If we've failed a sender, set up a recipient message, and point | |
2072 | sender_verified_failed to the address item that actually failed. */ | |
2073 | ||
2074 | if (rc != OK && verify_sender_address != NULL) | |
2075 | { | |
2076 | if (rc != DEFER) | |
059ec3d9 | 2077 | *log_msgptr = *user_msgptr = US"Sender verify failed"; |
059ec3d9 | 2078 | else if (*basic_errno != ERRNO_CALLOUTDEFER) |
059ec3d9 | 2079 | *log_msgptr = *user_msgptr = US"Could not complete sender verify"; |
059ec3d9 PH |
2080 | else |
2081 | { | |
2082 | *log_msgptr = US"Could not complete sender verify callout"; | |
2083 | *user_msgptr = smtp_return_error_details? sender_vaddr->user_message : | |
2084 | *log_msgptr; | |
2085 | } | |
2086 | ||
2087 | sender_verified_failed = sender_vaddr; | |
2088 | } | |
2089 | ||
2090 | /* Verifying an address messes up the values of $domain and $local_part, | |
2091 | so reset them before returning if this is a RCPT ACL. */ | |
2092 | ||
2093 | if (addr != NULL) | |
2094 | { | |
2095 | deliver_domain = addr->domain; | |
2096 | deliver_localpart = addr->local_part; | |
2097 | } | |
2098 | return rc; | |
2099 | ||
2100 | /* Syntax errors in the verify argument come here. */ | |
2101 | ||
2102 | BAD_VERIFY: | |
2103 | *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", " | |
770747fd MFM |
2104 | "\"helo\", \"header_syntax\", \"header_sender\", \"header_names_ascii\" " |
2105 | "or \"reverse_host_lookup\" at start of ACL condition " | |
059ec3d9 PH |
2106 | "\"verify %s\"", arg); |
2107 | return ERROR; | |
2108 | } | |
2109 | ||
2110 | ||
2111 | ||
2112 | ||
2113 | /************************************************* | |
2114 | * Check argument for control= modifier * | |
2115 | *************************************************/ | |
2116 | ||
2117 | /* Called from acl_check_condition() below | |
2118 | ||
2119 | Arguments: | |
2120 | arg the argument string for control= | |
2121 | pptr set to point to the terminating character | |
2122 | where which ACL we are in | |
2123 | log_msgptr for error messages | |
2124 | ||
2125 | Returns: CONTROL_xxx value | |
2126 | */ | |
2127 | ||
2128 | static int | |
55414b25 | 2129 | decode_control(const uschar *arg, const uschar **pptr, int where, uschar **log_msgptr) |
059ec3d9 | 2130 | { |
d7bed771 JH |
2131 | int idx, len; |
2132 | control_def * d; | |
059ec3d9 | 2133 | |
d7bed771 JH |
2134 | if ( (idx = find_control(arg, controls_list, nelem(controls_list))) < 0 |
2135 | || ( arg[len = Ustrlen((d = controls_list+idx)->name)] != 0 | |
2136 | && (!d->has_option || arg[len] != '/') | |
2137 | ) ) | |
059ec3d9 PH |
2138 | { |
2139 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2140 | return CONTROL_ERROR; | |
2141 | } | |
2142 | ||
059ec3d9 | 2143 | *pptr = arg + len; |
d7bed771 | 2144 | return idx; |
059ec3d9 PH |
2145 | } |
2146 | ||
2147 | ||
2148 | ||
c99ce5c9 TF |
2149 | |
2150 | /************************************************* | |
2151 | * Return a ratelimit error * | |
2152 | *************************************************/ | |
2153 | ||
2154 | /* Called from acl_ratelimit() below | |
2155 | ||
2156 | Arguments: | |
2157 | log_msgptr for error messages | |
2158 | format format string | |
2159 | ... supplementary arguments | |
c99ce5c9 TF |
2160 | |
2161 | Returns: ERROR | |
2162 | */ | |
2163 | ||
2164 | static int | |
2165 | ratelimit_error(uschar **log_msgptr, const char *format, ...) | |
2166 | { | |
2167 | va_list ap; | |
d12746bc JH |
2168 | gstring * g = |
2169 | string_cat(NULL, US"error in arguments to \"ratelimit\" condition: "); | |
2170 | ||
c99ce5c9 | 2171 | va_start(ap, format); |
f3ebb786 | 2172 | g = string_vformat(g, SVFMT_EXTEND|SVFMT_REBUFFER, format, ap); |
c99ce5c9 | 2173 | va_end(ap); |
d12746bc | 2174 | |
e59797e3 | 2175 | gstring_release_unused(g); |
d12746bc | 2176 | *log_msgptr = string_from_gstring(g); |
c99ce5c9 TF |
2177 | return ERROR; |
2178 | } | |
2179 | ||
2180 | ||
2181 | ||
2182 | ||
870f6ba8 TF |
2183 | /************************************************* |
2184 | * Handle rate limiting * | |
2185 | *************************************************/ | |
2186 | ||
2187 | /* Called by acl_check_condition() below to calculate the result | |
2188 | of the ACL ratelimit condition. | |
2189 | ||
2190 | Note that the return value might be slightly unexpected: if the | |
2191 | sender's rate is above the limit then the result is OK. This is | |
2192 | similar to the dnslists condition, and is so that you can write | |
2193 | ACL clauses like: defer ratelimit = 15 / 1h | |
2194 | ||
2195 | Arguments: | |
2196 | arg the option string for ratelimit= | |
90fc3069 | 2197 | where ACL_WHERE_xxxx indicating which ACL this is |
870f6ba8 TF |
2198 | log_msgptr for error messages |
2199 | ||
2200 | Returns: OK - Sender's rate is above limit | |
2201 | FAIL - Sender's rate is below limit | |
2202 | DEFER - Problem opening ratelimit database | |
2203 | ERROR - Syntax error in options. | |
2204 | */ | |
2205 | ||
2206 | static int | |
55414b25 | 2207 | acl_ratelimit(const uschar *arg, int where, uschar **log_msgptr) |
870f6ba8 | 2208 | { |
c99ce5c9 | 2209 | double limit, period, count; |
8f240103 PH |
2210 | uschar *ss; |
2211 | uschar *key = NULL; | |
c99ce5c9 | 2212 | uschar *unique = NULL; |
870f6ba8 | 2213 | int sep = '/'; |
c99ce5c9 TF |
2214 | BOOL leaky = FALSE, strict = FALSE, readonly = FALSE; |
2215 | BOOL noupdate = FALSE, badacl = FALSE; | |
2216 | int mode = RATE_PER_WHAT; | |
870f6ba8 TF |
2217 | int old_pool, rc; |
2218 | tree_node **anchor, *t; | |
2219 | open_db dbblock, *dbm; | |
c99ce5c9 | 2220 | int dbdb_size; |
870f6ba8 | 2221 | dbdata_ratelimit *dbd; |
c99ce5c9 | 2222 | dbdata_ratelimit_unique *dbdb; |
870f6ba8 TF |
2223 | struct timeval tv; |
2224 | ||
2225 | /* Parse the first two options and record their values in expansion | |
2226 | variables. These variables allow the configuration to have informative | |
2227 | error messages based on rate limits obtained from a table lookup. */ | |
2228 | ||
c99ce5c9 | 2229 | /* First is the maximum number of messages per period / maximum burst |
870f6ba8 TF |
2230 | size, which must be greater than or equal to zero. Zero is useful for |
2231 | rate measurement as opposed to rate limiting. */ | |
2232 | ||
65a32f85 | 2233 | if (!(sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0))) |
96f5fe4c JH |
2234 | return ratelimit_error(log_msgptr, "sender rate limit not set"); |
2235 | ||
2236 | limit = Ustrtod(sender_rate_limit, &ss); | |
2237 | if (tolower(*ss) == 'k') { limit *= 1024.0; ss++; } | |
2238 | else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; } | |
2239 | else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; } | |
2240 | ||
c99ce5c9 TF |
2241 | if (limit < 0.0 || *ss != '\0') |
2242 | return ratelimit_error(log_msgptr, | |
2243 | "\"%s\" is not a positive number", sender_rate_limit); | |
870f6ba8 | 2244 | |
c99ce5c9 | 2245 | /* Second is the rate measurement period / exponential smoothing time |
870f6ba8 TF |
2246 | constant. This must be strictly greater than zero, because zero leads to |
2247 | run-time division errors. */ | |
2248 | ||
65a32f85 JH |
2249 | period = !(sender_rate_period = string_nextinlist(&arg, &sep, NULL, 0)) |
2250 | ? -1.0 : readconf_readtime(sender_rate_period, 0, FALSE); | |
870f6ba8 | 2251 | if (period <= 0.0) |
c99ce5c9 TF |
2252 | return ratelimit_error(log_msgptr, |
2253 | "\"%s\" is not a time value", sender_rate_period); | |
2254 | ||
2255 | /* By default we are counting one of something, but the per_rcpt, | |
2256 | per_byte, and count options can change this. */ | |
2257 | ||
2258 | count = 1.0; | |
870f6ba8 | 2259 | |
c99ce5c9 | 2260 | /* Parse the other options. */ |
870f6ba8 | 2261 | |
65a32f85 | 2262 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size))) |
870f6ba8 TF |
2263 | { |
2264 | if (strcmpic(ss, US"leaky") == 0) leaky = TRUE; | |
2265 | else if (strcmpic(ss, US"strict") == 0) strict = TRUE; | |
8f240103 | 2266 | else if (strcmpic(ss, US"noupdate") == 0) noupdate = TRUE; |
c99ce5c9 TF |
2267 | else if (strcmpic(ss, US"readonly") == 0) readonly = TRUE; |
2268 | else if (strcmpic(ss, US"per_cmd") == 0) RATE_SET(mode, PER_CMD); | |
2269 | else if (strcmpic(ss, US"per_conn") == 0) | |
2270 | { | |
2271 | RATE_SET(mode, PER_CONN); | |
2272 | if (where == ACL_WHERE_NOTSMTP || where == ACL_WHERE_NOTSMTP_START) | |
2273 | badacl = TRUE; | |
2274 | } | |
2275 | else if (strcmpic(ss, US"per_mail") == 0) | |
2276 | { | |
2277 | RATE_SET(mode, PER_MAIL); | |
2278 | if (where > ACL_WHERE_NOTSMTP) badacl = TRUE; | |
2279 | } | |
2280 | else if (strcmpic(ss, US"per_rcpt") == 0) | |
2281 | { | |
2282 | /* If we are running in the RCPT ACL, then we'll count the recipients | |
2283 | one by one, but if we are running when we have accumulated the whole | |
2284 | list then we'll add them all in one batch. */ | |
2285 | if (where == ACL_WHERE_RCPT) | |
2286 | RATE_SET(mode, PER_RCPT); | |
2287 | else if (where >= ACL_WHERE_PREDATA && where <= ACL_WHERE_NOTSMTP) | |
2288 | RATE_SET(mode, PER_ALLRCPTS), count = (double)recipients_count; | |
2289 | else if (where == ACL_WHERE_MAIL || where > ACL_WHERE_NOTSMTP) | |
2290 | RATE_SET(mode, PER_RCPT), badacl = TRUE; | |
2291 | } | |
2292 | else if (strcmpic(ss, US"per_byte") == 0) | |
2293 | { | |
2294 | /* If we have not yet received the message data and there was no SIZE | |
4c04137d | 2295 | declaration on the MAIL command, then it's safe to just use a value of |
c99ce5c9 TF |
2296 | zero and let the recorded rate decay as if nothing happened. */ |
2297 | RATE_SET(mode, PER_MAIL); | |
2298 | if (where > ACL_WHERE_NOTSMTP) badacl = TRUE; | |
65a32f85 | 2299 | else count = message_size < 0 ? 0.0 : (double)message_size; |
c99ce5c9 TF |
2300 | } |
2301 | else if (strcmpic(ss, US"per_addr") == 0) | |
2302 | { | |
2303 | RATE_SET(mode, PER_RCPT); | |
438257ba | 2304 | if (where != ACL_WHERE_RCPT) badacl = TRUE, unique = US"*"; |
65a32f85 | 2305 | else unique = string_sprintf("%s@%s", deliver_localpart, deliver_domain); |
c99ce5c9 TF |
2306 | } |
2307 | else if (strncmpic(ss, US"count=", 6) == 0) | |
2308 | { | |
2309 | uschar *e; | |
2310 | count = Ustrtod(ss+6, &e); | |
2311 | if (count < 0.0 || *e != '\0') | |
65a32f85 | 2312 | return ratelimit_error(log_msgptr, "\"%s\" is not a positive number", ss); |
c99ce5c9 TF |
2313 | } |
2314 | else if (strncmpic(ss, US"unique=", 7) == 0) | |
2315 | unique = string_copy(ss + 7); | |
65a32f85 | 2316 | else if (!key) |
c99ce5c9 TF |
2317 | key = string_copy(ss); |
2318 | else | |
2319 | key = string_sprintf("%s/%s", key, ss); | |
870f6ba8 TF |
2320 | } |
2321 | ||
c99ce5c9 TF |
2322 | /* Sanity check. When the badacl flag is set the update mode must either |
2323 | be readonly (which is the default if it is omitted) or, for backwards | |
2324 | compatibility, a combination of noupdate and strict or leaky. */ | |
2325 | ||
2326 | if (mode == RATE_PER_CLASH) | |
2327 | return ratelimit_error(log_msgptr, "conflicting per_* options"); | |
2328 | if (leaky + strict + readonly > 1) | |
2329 | return ratelimit_error(log_msgptr, "conflicting update modes"); | |
2330 | if (badacl && (leaky || strict) && !noupdate) | |
2331 | return ratelimit_error(log_msgptr, | |
bfe6da19 | 2332 | "\"%s\" must not have /leaky or /strict option, or cannot be used in %s ACL", |
c99ce5c9 TF |
2333 | ratelimit_option_string[mode], acl_wherenames[where]); |
2334 | ||
2335 | /* Set the default values of any unset options. In readonly mode we | |
2336 | perform the rate computation without any increment so that its value | |
2337 | decays to eventually allow over-limit senders through. */ | |
2338 | ||
2339 | if (noupdate) readonly = TRUE, leaky = strict = FALSE; | |
2340 | if (badacl) readonly = TRUE; | |
2341 | if (readonly) count = 0.0; | |
2342 | if (!strict && !readonly) leaky = TRUE; | |
2343 | if (mode == RATE_PER_WHAT) mode = RATE_PER_MAIL; | |
870f6ba8 | 2344 | |
8f240103 PH |
2345 | /* Create the lookup key. If there is no explicit key, use sender_host_address. |
2346 | If there is no sender_host_address (e.g. -bs or acl_not_smtp) then we simply | |
2347 | omit it. The smoothing constant (sender_rate_period) and the per_xxx options | |
2348 | are added to the key because they alter the meaning of the stored data. */ | |
2349 | ||
65a32f85 JH |
2350 | if (!key) |
2351 | key = !sender_host_address ? US"" : sender_host_address; | |
870f6ba8 | 2352 | |
c99ce5c9 | 2353 | key = string_sprintf("%s/%s/%s%s", |
8f240103 | 2354 | sender_rate_period, |
c99ce5c9 TF |
2355 | ratelimit_option_string[mode], |
2356 | unique == NULL ? "" : "unique/", | |
8f240103 | 2357 | key); |
870f6ba8 | 2358 | |
c99ce5c9 | 2359 | HDEBUG(D_acl) |
e1d04f48 | 2360 | debug_printf_indent("ratelimit condition count=%.0f %.1f/%s\n", count, limit, key); |
870f6ba8 | 2361 | |
8f240103 PH |
2362 | /* See if we have already computed the rate by looking in the relevant tree. |
2363 | For per-connection rate limiting, store tree nodes and dbdata in the permanent | |
c99ce5c9 TF |
2364 | pool so that they survive across resets. In readonly mode we only remember the |
2365 | result for the rest of this command in case a later command changes it. After | |
2366 | this bit of logic the code is independent of the per_* mode. */ | |
870f6ba8 | 2367 | |
870f6ba8 TF |
2368 | old_pool = store_pool; |
2369 | ||
c99ce5c9 TF |
2370 | if (readonly) |
2371 | anchor = &ratelimiters_cmd; | |
65a32f85 JH |
2372 | else switch(mode) |
2373 | { | |
2374 | case RATE_PER_CONN: | |
2375 | anchor = &ratelimiters_conn; | |
2376 | store_pool = POOL_PERM; | |
2377 | break; | |
2378 | case RATE_PER_BYTE: | |
2379 | case RATE_PER_MAIL: | |
2380 | case RATE_PER_ALLRCPTS: | |
2381 | anchor = &ratelimiters_mail; | |
2382 | break; | |
2383 | case RATE_PER_ADDR: | |
2384 | case RATE_PER_CMD: | |
2385 | case RATE_PER_RCPT: | |
2386 | anchor = &ratelimiters_cmd; | |
2387 | break; | |
2388 | default: | |
2389 | anchor = NULL; /* silence an "unused" complaint */ | |
2390 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
2391 | "internal ACL error: unknown ratelimit mode %d", mode); | |
2392 | break; | |
2393 | } | |
870f6ba8 | 2394 | |
65a32f85 | 2395 | if ((t = tree_search(*anchor, key))) |
870f6ba8 TF |
2396 | { |
2397 | dbd = t->data.ptr; | |
2398 | /* The following few lines duplicate some of the code below. */ | |
8f240103 | 2399 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2400 | store_pool = old_pool; |
2401 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2402 | HDEBUG(D_acl) | |
e1d04f48 | 2403 | debug_printf_indent("ratelimit found pre-computed rate %s\n", sender_rate); |
870f6ba8 TF |
2404 | return rc; |
2405 | } | |
2406 | ||
c99ce5c9 TF |
2407 | /* We aren't using a pre-computed rate, so get a previously recorded rate |
2408 | from the database, which will be updated and written back if required. */ | |
870f6ba8 | 2409 | |
b10c87b3 | 2410 | if (!(dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE, TRUE))) |
870f6ba8 TF |
2411 | { |
2412 | store_pool = old_pool; | |
2413 | sender_rate = NULL; | |
e1d04f48 | 2414 | HDEBUG(D_acl) debug_printf_indent("ratelimit database not available\n"); |
870f6ba8 TF |
2415 | *log_msgptr = US"ratelimit database not available"; |
2416 | return DEFER; | |
2417 | } | |
c99ce5c9 TF |
2418 | dbdb = dbfn_read_with_length(dbm, key, &dbdb_size); |
2419 | dbd = NULL; | |
870f6ba8 TF |
2420 | |
2421 | gettimeofday(&tv, NULL); | |
2422 | ||
65a32f85 | 2423 | if (dbdb) |
c99ce5c9 TF |
2424 | { |
2425 | /* Locate the basic ratelimit block inside the DB data. */ | |
e1d04f48 | 2426 | HDEBUG(D_acl) debug_printf_indent("ratelimit found key in database\n"); |
c99ce5c9 TF |
2427 | dbd = &dbdb->dbd; |
2428 | ||
2429 | /* Forget the old Bloom filter if it is too old, so that we count each | |
2430 | repeating event once per period. We don't simply clear and re-use the old | |
2431 | filter because we want its size to change if the limit changes. Note that | |
2432 | we keep the dbd pointer for copying the rate into the new data block. */ | |
2433 | ||
65a32f85 | 2434 | if(unique && tv.tv_sec > dbdb->bloom_epoch + period) |
c99ce5c9 | 2435 | { |
e1d04f48 | 2436 | HDEBUG(D_acl) debug_printf_indent("ratelimit discarding old Bloom filter\n"); |
c99ce5c9 TF |
2437 | dbdb = NULL; |
2438 | } | |
2439 | ||
2440 | /* Sanity check. */ | |
2441 | ||
65a32f85 | 2442 | if(unique && dbdb_size < sizeof(*dbdb)) |
c99ce5c9 | 2443 | { |
e1d04f48 | 2444 | HDEBUG(D_acl) debug_printf_indent("ratelimit discarding undersize Bloom filter\n"); |
c99ce5c9 TF |
2445 | dbdb = NULL; |
2446 | } | |
2447 | } | |
2448 | ||
2449 | /* Allocate a new data block if the database lookup failed | |
2450 | or the Bloom filter passed its age limit. */ | |
2451 | ||
65a32f85 | 2452 | if (!dbdb) |
c99ce5c9 | 2453 | { |
65a32f85 | 2454 | if (!unique) |
c99ce5c9 TF |
2455 | { |
2456 | /* No Bloom filter. This basic ratelimit block is initialized below. */ | |
e1d04f48 | 2457 | HDEBUG(D_acl) debug_printf_indent("ratelimit creating new rate data block\n"); |
c99ce5c9 | 2458 | dbdb_size = sizeof(*dbd); |
f3ebb786 | 2459 | dbdb = store_get(dbdb_size, FALSE); /* not tainted */ |
c99ce5c9 TF |
2460 | } |
2461 | else | |
2462 | { | |
2463 | int extra; | |
e1d04f48 | 2464 | HDEBUG(D_acl) debug_printf_indent("ratelimit creating new Bloom filter\n"); |
c99ce5c9 TF |
2465 | |
2466 | /* See the long comment below for an explanation of the magic number 2. | |
2467 | The filter has a minimum size in case the rate limit is very small; | |
2468 | this is determined by the definition of dbdata_ratelimit_unique. */ | |
2469 | ||
2470 | extra = (int)limit * 2 - sizeof(dbdb->bloom); | |
2471 | if (extra < 0) extra = 0; | |
2472 | dbdb_size = sizeof(*dbdb) + extra; | |
f3ebb786 | 2473 | dbdb = store_get(dbdb_size, FALSE); /* not tainted */ |
c99ce5c9 TF |
2474 | dbdb->bloom_epoch = tv.tv_sec; |
2475 | dbdb->bloom_size = sizeof(dbdb->bloom) + extra; | |
2476 | memset(dbdb->bloom, 0, dbdb->bloom_size); | |
2477 | ||
2478 | /* Preserve any basic ratelimit data (which is our longer-term memory) | |
2479 | by copying it from the discarded block. */ | |
2480 | ||
65a32f85 | 2481 | if (dbd) |
c99ce5c9 TF |
2482 | { |
2483 | dbdb->dbd = *dbd; | |
2484 | dbd = &dbdb->dbd; | |
2485 | } | |
2486 | } | |
2487 | } | |
2488 | ||
2489 | /* If we are counting unique events, find out if this event is new or not. | |
2490 | If the client repeats the event during the current period then it should be | |
2491 | counted. We skip this code in readonly mode for efficiency, because any | |
2492 | changes to the filter will be discarded and because count is already set to | |
2493 | zero. */ | |
2494 | ||
65a32f85 | 2495 | if (unique && !readonly) |
c99ce5c9 TF |
2496 | { |
2497 | /* We identify unique events using a Bloom filter. (You can find my | |
2498 | notes on Bloom filters at http://fanf.livejournal.com/81696.html) | |
2499 | With the per_addr option, an "event" is a recipient address, though the | |
2500 | user can use the unique option to define their own events. We only count | |
2501 | an event if we have not seen it before. | |
2502 | ||
2503 | We size the filter according to the rate limit, which (in leaky mode) | |
2504 | is the limit on the population of the filter. We allow 16 bits of space | |
2505 | per entry (see the construction code above) and we set (up to) 8 of them | |
2506 | when inserting an element (see the loop below). The probability of a false | |
2507 | positive (an event we have not seen before but which we fail to count) is | |
2508 | ||
2509 | size = limit * 16 | |
2510 | numhash = 8 | |
2511 | allzero = exp(-numhash * pop / size) | |
2512 | = exp(-0.5 * pop / limit) | |
2513 | fpr = pow(1 - allzero, numhash) | |
2514 | ||
2515 | For senders at the limit the fpr is 0.06% or 1 in 1700 | |
2516 | and for senders at half the limit it is 0.0006% or 1 in 170000 | |
2517 | ||
2518 | In strict mode the Bloom filter can fill up beyond the normal limit, in | |
2519 | which case the false positive rate will rise. This means that the | |
2520 | measured rate for very fast senders can bogusly drop off after a while. | |
2521 | ||
2522 | At twice the limit, the fpr is 2.5% or 1 in 40 | |
2523 | At four times the limit, it is 31% or 1 in 3.2 | |
2524 | ||
2525 | It takes ln(pop/limit) periods for an over-limit burst of pop events to | |
2526 | decay below the limit, and if this is more than one then the Bloom filter | |
2527 | will be discarded before the decay gets that far. The false positive rate | |
2528 | at this threshold is 9.3% or 1 in 10.7. */ | |
2529 | ||
2530 | BOOL seen; | |
2531 | unsigned n, hash, hinc; | |
2532 | uschar md5sum[16]; | |
2533 | md5 md5info; | |
2534 | ||
2535 | /* Instead of using eight independent hash values, we combine two values | |
2536 | using the formula h1 + n * h2. This does not harm the Bloom filter's | |
2537 | performance, and means the amount of hash we need is independent of the | |
2538 | number of bits we set in the filter. */ | |
2539 | ||
2540 | md5_start(&md5info); | |
2541 | md5_end(&md5info, unique, Ustrlen(unique), md5sum); | |
2542 | hash = md5sum[0] | md5sum[1] << 8 | md5sum[2] << 16 | md5sum[3] << 24; | |
2543 | hinc = md5sum[4] | md5sum[5] << 8 | md5sum[6] << 16 | md5sum[7] << 24; | |
2544 | ||
2545 | /* Scan the bits corresponding to this event. A zero bit means we have | |
2546 | not seen it before. Ensure all bits are set to record this event. */ | |
2547 | ||
e1d04f48 | 2548 | HDEBUG(D_acl) debug_printf_indent("ratelimit checking uniqueness of %s\n", unique); |
c99ce5c9 TF |
2549 | |
2550 | seen = TRUE; | |
2551 | for (n = 0; n < 8; n++, hash += hinc) | |
2552 | { | |
2553 | int bit = 1 << (hash % 8); | |
2554 | int byte = (hash / 8) % dbdb->bloom_size; | |
2555 | if ((dbdb->bloom[byte] & bit) == 0) | |
2556 | { | |
2557 | dbdb->bloom[byte] |= bit; | |
2558 | seen = FALSE; | |
2559 | } | |
2560 | } | |
2561 | ||
2562 | /* If this event has occurred before, do not count it. */ | |
2563 | ||
2564 | if (seen) | |
2565 | { | |
e1d04f48 | 2566 | HDEBUG(D_acl) debug_printf_indent("ratelimit event found in Bloom filter\n"); |
c99ce5c9 TF |
2567 | count = 0.0; |
2568 | } | |
2569 | else | |
e1d04f48 | 2570 | HDEBUG(D_acl) debug_printf_indent("ratelimit event added to Bloom filter\n"); |
c99ce5c9 TF |
2571 | } |
2572 | ||
2573 | /* If there was no previous ratelimit data block for this key, initialize | |
2574 | the new one, otherwise update the block from the database. The initial rate | |
2575 | is what would be computed by the code below for an infinite interval. */ | |
2576 | ||
65a32f85 | 2577 | if (!dbd) |
870f6ba8 | 2578 | { |
e1d04f48 | 2579 | HDEBUG(D_acl) debug_printf_indent("ratelimit initializing new key's rate data\n"); |
c99ce5c9 | 2580 | dbd = &dbdb->dbd; |
870f6ba8 TF |
2581 | dbd->time_stamp = tv.tv_sec; |
2582 | dbd->time_usec = tv.tv_usec; | |
c99ce5c9 | 2583 | dbd->rate = count; |
870f6ba8 TF |
2584 | } |
2585 | else | |
2586 | { | |
2587 | /* The smoothed rate is computed using an exponentially weighted moving | |
2588 | average adjusted for variable sampling intervals. The standard EWMA for | |
2589 | a fixed sampling interval is: f'(t) = (1 - a) * f(t) + a * f'(t - 1) | |
2590 | where f() is the measured value and f'() is the smoothed value. | |
2591 | ||
2592 | Old data decays out of the smoothed value exponentially, such that data n | |
2593 | samples old is multiplied by a^n. The exponential decay time constant p | |
2594 | is defined such that data p samples old is multiplied by 1/e, which means | |
2595 | that a = exp(-1/p). We can maintain the same time constant for a variable | |
2596 | sampling interval i by using a = exp(-i/p). | |
2597 | ||
2598 | The rate we are measuring is messages per period, suitable for directly | |
2599 | comparing with the limit. The average rate between now and the previous | |
2600 | message is period / interval, which we feed into the EWMA as the sample. | |
2601 | ||
2602 | It turns out that the number of messages required for the smoothed rate | |
2603 | to reach the limit when they are sent in a burst is equal to the limit. | |
2604 | This can be seen by analysing the value of the smoothed rate after N | |
2605 | messages sent at even intervals. Let k = (1 - a) * p/i | |
2606 | ||
2607 | rate_1 = (1 - a) * p/i + a * rate_0 | |
2608 | = k + a * rate_0 | |
2609 | rate_2 = k + a * rate_1 | |
2610 | = k + a * k + a^2 * rate_0 | |
2611 | rate_3 = k + a * k + a^2 * k + a^3 * rate_0 | |
2612 | rate_N = rate_0 * a^N + k * SUM(x=0..N-1)(a^x) | |
2613 | = rate_0 * a^N + k * (1 - a^N) / (1 - a) | |
2614 | = rate_0 * a^N + p/i * (1 - a^N) | |
2615 | ||
2616 | When N is large, a^N -> 0 so rate_N -> p/i as desired. | |
2617 | ||
2618 | rate_N = p/i + (rate_0 - p/i) * a^N | |
2619 | a^N = (rate_N - p/i) / (rate_0 - p/i) | |
2620 | N * -i/p = log((rate_N - p/i) / (rate_0 - p/i)) | |
2621 | N = p/i * log((rate_0 - p/i) / (rate_N - p/i)) | |
2622 | ||
2623 | Numerical analysis of the above equation, setting the computed rate to | |
2624 | increase from rate_0 = 0 to rate_N = limit, shows that for large sending | |
2625 | rates, p/i, the number of messages N = limit. So limit serves as both the | |
2626 | maximum rate measured in messages per period, and the maximum number of | |
2627 | messages that can be sent in a fast burst. */ | |
2628 | ||
2629 | double this_time = (double)tv.tv_sec | |
2630 | + (double)tv.tv_usec / 1000000.0; | |
2631 | double prev_time = (double)dbd->time_stamp | |
2632 | + (double)dbd->time_usec / 1000000.0; | |
870f6ba8 TF |
2633 | |
2634 | /* We must avoid division by zero, and deal gracefully with the clock going | |
2635 | backwards. If we blunder ahead when time is in reverse then the computed | |
e5d5a95f | 2636 | rate will be bogus. To be safe we clamp interval to a very small number. */ |
870f6ba8 | 2637 | |
e5d5a95f TF |
2638 | double interval = this_time - prev_time <= 0.0 ? 1e-9 |
2639 | : this_time - prev_time; | |
2640 | ||
2641 | double i_over_p = interval / period; | |
2642 | double a = exp(-i_over_p); | |
870f6ba8 | 2643 | |
c99ce5c9 TF |
2644 | /* Combine the instantaneous rate (period / interval) with the previous rate |
2645 | using the smoothing factor a. In order to measure sized events, multiply the | |
2646 | instantaneous rate by the count of bytes or recipients etc. */ | |
2647 | ||
870f6ba8 TF |
2648 | dbd->time_stamp = tv.tv_sec; |
2649 | dbd->time_usec = tv.tv_usec; | |
c99ce5c9 TF |
2650 | dbd->rate = (1 - a) * count / i_over_p + a * dbd->rate; |
2651 | ||
2652 | /* When events are very widely spaced the computed rate tends towards zero. | |
2653 | Although this is accurate it turns out not to be useful for our purposes, | |
2654 | especially when the first event after a long silence is the start of a spam | |
2655 | run. A more useful model is that the rate for an isolated event should be the | |
2656 | size of the event per the period size, ignoring the lack of events outside | |
2657 | the current period and regardless of where the event falls in the period. So, | |
2658 | if the interval was so long that the calculated rate is unhelpfully small, we | |
4c04137d | 2659 | re-initialize the rate. In the absence of higher-rate bursts, the condition |
c99ce5c9 TF |
2660 | below is true if the interval is greater than the period. */ |
2661 | ||
2662 | if (dbd->rate < count) dbd->rate = count; | |
870f6ba8 TF |
2663 | } |
2664 | ||
c99ce5c9 TF |
2665 | /* Clients sending at the limit are considered to be over the limit. |
2666 | This matters for edge cases such as a limit of zero, when the client | |
2667 | should be completely blocked. */ | |
3348576f | 2668 | |
65a32f85 | 2669 | rc = dbd->rate < limit ? FAIL : OK; |
870f6ba8 TF |
2670 | |
2671 | /* Update the state if the rate is low or if we are being strict. If we | |
2672 | are in leaky mode and the sender's rate is too high, we do not update | |
2673 | the recorded rate in order to avoid an over-aggressive sender's retry | |
c99ce5c9 TF |
2674 | rate preventing them from getting any email through. If readonly is set, |
2675 | neither leaky nor strict are set, so we do not do any updates. */ | |
870f6ba8 | 2676 | |
c99ce5c9 | 2677 | if ((rc == FAIL && leaky) || strict) |
8f240103 | 2678 | { |
c99ce5c9 | 2679 | dbfn_write(dbm, key, dbdb, dbdb_size); |
e1d04f48 | 2680 | HDEBUG(D_acl) debug_printf_indent("ratelimit db updated\n"); |
8f240103 PH |
2681 | } |
2682 | else | |
2683 | { | |
e1d04f48 | 2684 | HDEBUG(D_acl) debug_printf_indent("ratelimit db not updated: %s\n", |
c99ce5c9 | 2685 | readonly? "readonly mode" : "over the limit, but leaky"); |
8f240103 PH |
2686 | } |
2687 | ||
870f6ba8 TF |
2688 | dbfn_close(dbm); |
2689 | ||
f3ebb786 JH |
2690 | /* Store the result in the tree for future reference. Take the taint status |
2691 | from the key for consistency even though it's unlikely we'll ever expand this. */ | |
870f6ba8 | 2692 | |
f3ebb786 | 2693 | t = store_get(sizeof(tree_node) + Ustrlen(key), is_tainted(key)); |
c99ce5c9 TF |
2694 | t->data.ptr = dbd; |
2695 | Ustrcpy(t->name, key); | |
2696 | (void)tree_insertnode(anchor, t); | |
870f6ba8 TF |
2697 | |
2698 | /* We create the formatted version of the sender's rate very late in | |
2699 | order to ensure that it is done using the correct storage pool. */ | |
2700 | ||
2701 | store_pool = old_pool; | |
2702 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2703 | ||
2704 | HDEBUG(D_acl) | |
e1d04f48 | 2705 | debug_printf_indent("ratelimit computed rate %s\n", sender_rate); |
870f6ba8 TF |
2706 | |
2707 | return rc; | |
2708 | } | |
2709 | ||
2710 | ||
2711 | ||
b0019c78 TF |
2712 | /************************************************* |
2713 | * The udpsend ACL modifier * | |
2714 | *************************************************/ | |
2715 | ||
2716 | /* Called by acl_check_condition() below. | |
2717 | ||
2718 | Arguments: | |
2719 | arg the option string for udpsend= | |
2720 | log_msgptr for error messages | |
2721 | ||
2722 | Returns: OK - Completed. | |
2723 | DEFER - Problem with DNS lookup. | |
2724 | ERROR - Syntax error in options. | |
2725 | */ | |
2726 | ||
2727 | static int | |
55414b25 | 2728 | acl_udpsend(const uschar *arg, uschar **log_msgptr) |
b0019c78 TF |
2729 | { |
2730 | int sep = 0; | |
2731 | uschar *hostname; | |
2732 | uschar *portstr; | |
2733 | uschar *portend; | |
2734 | host_item *h; | |
2735 | int portnum; | |
b0019c78 TF |
2736 | int len; |
2737 | int r, s; | |
b1f8e4f8 | 2738 | uschar * errstr; |
b0019c78 TF |
2739 | |
2740 | hostname = string_nextinlist(&arg, &sep, NULL, 0); | |
2741 | portstr = string_nextinlist(&arg, &sep, NULL, 0); | |
2742 | ||
f5d25c2b | 2743 | if (!hostname) |
b0019c78 | 2744 | { |
217b0e56 | 2745 | *log_msgptr = US"missing destination host in \"udpsend\" modifier"; |
b0019c78 TF |
2746 | return ERROR; |
2747 | } | |
f5d25c2b | 2748 | if (!portstr) |
b0019c78 | 2749 | { |
217b0e56 | 2750 | *log_msgptr = US"missing destination port in \"udpsend\" modifier"; |
b0019c78 TF |
2751 | return ERROR; |
2752 | } | |
f5d25c2b | 2753 | if (!arg) |
b0019c78 | 2754 | { |
217b0e56 | 2755 | *log_msgptr = US"missing datagram payload in \"udpsend\" modifier"; |
b0019c78 TF |
2756 | return ERROR; |
2757 | } | |
2758 | portnum = Ustrtol(portstr, &portend, 10); | |
2759 | if (*portend != '\0') | |
2760 | { | |
217b0e56 | 2761 | *log_msgptr = US"bad destination port in \"udpsend\" modifier"; |
b0019c78 TF |
2762 | return ERROR; |
2763 | } | |
2764 | ||
2765 | /* Make a single-item host list. */ | |
f3ebb786 | 2766 | h = store_get(sizeof(host_item), FALSE); |
b0019c78 TF |
2767 | memset(h, 0, sizeof(host_item)); |
2768 | h->name = hostname; | |
2769 | h->port = portnum; | |
2770 | h->mx = MX_NONE; | |
2771 | ||
2772 | if (string_is_ip_address(hostname, NULL)) | |
2773 | h->address = hostname, r = HOST_FOUND; | |
2774 | else | |
2775 | r = host_find_byname(h, NULL, 0, NULL, FALSE); | |
2776 | if (r == HOST_FIND_FAILED || r == HOST_FIND_AGAIN) | |
2777 | { | |
217b0e56 | 2778 | *log_msgptr = US"DNS lookup failed in \"udpsend\" modifier"; |
b0019c78 TF |
2779 | return DEFER; |
2780 | } | |
2781 | ||
2782 | HDEBUG(D_acl) | |
e1d04f48 | 2783 | debug_printf_indent("udpsend [%s]:%d %s\n", h->address, portnum, arg); |
b0019c78 | 2784 | |
4a5cbaff | 2785 | /*XXX this could better use sendto */ |
b1f8e4f8 | 2786 | r = s = ip_connectedsocket(SOCK_DGRAM, h->address, portnum, portnum, |
4a5cbaff | 2787 | 1, NULL, &errstr, NULL); |
b0019c78 | 2788 | if (r < 0) goto defer; |
27f9999e | 2789 | len = Ustrlen(arg); |
9cb1785a | 2790 | r = send(s, arg, len, 0); |
b1f8e4f8 JH |
2791 | if (r < 0) |
2792 | { | |
2793 | errstr = US strerror(errno); | |
2794 | close(s); | |
2795 | goto defer; | |
2796 | } | |
2797 | close(s); | |
b0019c78 TF |
2798 | if (r < len) |
2799 | { | |
2800 | *log_msgptr = | |
2801 | string_sprintf("\"udpsend\" truncated from %d to %d octets", len, r); | |
2802 | return DEFER; | |
2803 | } | |
2804 | ||
2805 | HDEBUG(D_acl) | |
e1d04f48 | 2806 | debug_printf_indent("udpsend %d bytes\n", r); |
b0019c78 TF |
2807 | |
2808 | return OK; | |
2809 | ||
2810 | defer: | |
b1f8e4f8 | 2811 | *log_msgptr = string_sprintf("\"udpsend\" failed: %s", errstr); |
b0019c78 TF |
2812 | return DEFER; |
2813 | } | |
2814 | ||
2815 | ||
2816 | ||
059ec3d9 PH |
2817 | /************************************************* |
2818 | * Handle conditions/modifiers on an ACL item * | |
2819 | *************************************************/ | |
2820 | ||
2821 | /* Called from acl_check() below. | |
2822 | ||
2823 | Arguments: | |
2824 | verb ACL verb | |
2825 | cb ACL condition block - if NULL, result is OK | |
2826 | where where called from | |
2827 | addr the address being checked for RCPT, or NULL | |
2828 | level the nesting level | |
2829 | epp pointer to pass back TRUE if "endpass" encountered | |
2830 | (applies only to "accept" and "discard") | |
2831 | user_msgptr user message pointer | |
2832 | log_msgptr log message pointer | |
2833 | basic_errno pointer to where to put verify error | |
2834 | ||
2835 | Returns: OK - all conditions are met | |
2836 | DISCARD - an "acl" condition returned DISCARD - only allowed | |
2837 | for "accept" or "discard" verbs | |
2838 | FAIL - at least one condition fails | |
2839 | FAIL_DROP - an "acl" condition returned FAIL_DROP | |
2840 | DEFER - can't tell at the moment (typically, lookup defer, | |
2841 | but can be temporary callout problem) | |
2842 | ERROR - ERROR from nested ACL or expansion failure or other | |
2843 | error | |
2844 | */ | |
2845 | ||
2846 | static int | |
2847 | acl_check_condition(int verb, acl_condition_block *cb, int where, | |
2848 | address_item *addr, int level, BOOL *epp, uschar **user_msgptr, | |
2849 | uschar **log_msgptr, int *basic_errno) | |
2850 | { | |
2851 | uschar *user_message = NULL; | |
2852 | uschar *log_message = NULL; | |
059ec3d9 | 2853 | int rc = OK; |
8523533c | 2854 | #ifdef WITH_CONTENT_SCAN |
0f0c8159 | 2855 | int sep = -'/'; |
8523533c | 2856 | #endif |
059ec3d9 | 2857 | |
bce15b62 | 2858 | for (; cb; cb = cb->next) |
059ec3d9 | 2859 | { |
55414b25 | 2860 | const uschar *arg; |
8e669ac1 | 2861 | int control_type; |
059ec3d9 PH |
2862 | |
2863 | /* The message and log_message items set up messages to be used in | |
2864 | case of rejection. They are expanded later. */ | |
2865 | ||
2866 | if (cb->type == ACLC_MESSAGE) | |
2867 | { | |
e1d04f48 | 2868 | HDEBUG(D_acl) debug_printf_indent(" message: %s\n", cb->arg); |
059ec3d9 PH |
2869 | user_message = cb->arg; |
2870 | continue; | |
2871 | } | |
2872 | ||
2873 | if (cb->type == ACLC_LOG_MESSAGE) | |
2874 | { | |
e1d04f48 | 2875 | HDEBUG(D_acl) debug_printf_indent("l_message: %s\n", cb->arg); |
059ec3d9 PH |
2876 | log_message = cb->arg; |
2877 | continue; | |
2878 | } | |
2879 | ||
2880 | /* The endpass "condition" just sets a flag to show it occurred. This is | |
2881 | checked at compile time to be on an "accept" or "discard" item. */ | |
2882 | ||
2883 | if (cb->type == ACLC_ENDPASS) | |
2884 | { | |
2885 | *epp = TRUE; | |
2886 | continue; | |
2887 | } | |
2888 | ||
2889 | /* For other conditions and modifiers, the argument is expanded now for some | |
2890 | of them, but not for all, because expansion happens down in some lower level | |
2891 | checking functions in some cases. */ | |
2892 | ||
560e71cc JH |
2893 | if (!conditions[cb->type].expand_at_top) |
2894 | arg = cb->arg; | |
2895 | else if (!(arg = expand_string(cb->arg))) | |
059ec3d9 | 2896 | { |
8768d548 | 2897 | if (f.expand_string_forcedfail) continue; |
560e71cc JH |
2898 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", |
2899 | cb->arg, expand_string_message); | |
8768d548 | 2900 | return f.search_find_defer ? DEFER : ERROR; |
059ec3d9 | 2901 | } |
059ec3d9 PH |
2902 | |
2903 | /* Show condition, and expanded condition if it's different */ | |
2904 | ||
2905 | HDEBUG(D_acl) | |
2906 | { | |
2907 | int lhswidth = 0; | |
e1d04f48 | 2908 | debug_printf_indent("check %s%s %n", |
2d009132 JH |
2909 | (!conditions[cb->type].is_modifier && cb->u.negated)? "!":"", |
2910 | conditions[cb->type].name, &lhswidth); | |
059ec3d9 PH |
2911 | |
2912 | if (cb->type == ACLC_SET) | |
2913 | { | |
a79d8834 JH |
2914 | #ifndef DISABLE_DKIM |
2915 | if ( Ustrcmp(cb->u.varname, "dkim_verify_status") == 0 | |
2916 | || Ustrcmp(cb->u.varname, "dkim_verify_reason") == 0) | |
2917 | { | |
2918 | debug_printf("%s ", cb->u.varname); | |
2919 | lhswidth += 19; | |
2920 | } | |
2921 | else | |
2922 | #endif | |
2923 | { | |
2924 | debug_printf("acl_%s ", cb->u.varname); | |
2925 | lhswidth += 5 + Ustrlen(cb->u.varname); | |
2926 | } | |
059ec3d9 PH |
2927 | } |
2928 | ||
2929 | debug_printf("= %s\n", cb->arg); | |
2930 | ||
2931 | if (arg != cb->arg) | |
2932 | debug_printf("%.*s= %s\n", lhswidth, | |
2933 | US" ", CS arg); | |
2934 | } | |
2935 | ||
2936 | /* Check that this condition makes sense at this time */ | |
2937 | ||
2d009132 | 2938 | if ((conditions[cb->type].forbids & (1 << where)) != 0) |
059ec3d9 PH |
2939 | { |
2940 | *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL", | |
2d009132 JH |
2941 | conditions[cb->type].is_modifier ? "use" : "test", |
2942 | conditions[cb->type].name, acl_wherenames[where]); | |
059ec3d9 PH |
2943 | return ERROR; |
2944 | } | |
2945 | ||
2946 | /* Run the appropriate test for each condition, or take the appropriate | |
2947 | action for the remaining modifiers. */ | |
2948 | ||
2949 | switch(cb->type) | |
2950 | { | |
71fafd95 PH |
2951 | case ACLC_ADD_HEADER: |
2952 | setup_header(arg); | |
2953 | break; | |
2954 | ||
059ec3d9 PH |
2955 | /* A nested ACL that returns "discard" makes sense only for an "accept" or |
2956 | "discard" verb. */ | |
71fafd95 | 2957 | |
059ec3d9 | 2958 | case ACLC_ACL: |
e1d04f48 | 2959 | rc = acl_check_wargs(where, addr, arg, user_msgptr, log_msgptr); |
7421ecab JH |
2960 | if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD) |
2961 | { | |
2962 | *log_msgptr = string_sprintf("nested ACL returned \"discard\" for " | |
2963 | "\"%s\" command (only allowed with \"accept\" or \"discard\")", | |
2964 | verbs[verb]); | |
2965 | return ERROR; | |
2966 | } | |
059ec3d9 PH |
2967 | break; |
2968 | ||
2969 | case ACLC_AUTHENTICATED: | |
c44ff8be JH |
2970 | rc = sender_host_authenticated ? match_isinlist(sender_host_authenticated, |
2971 | &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL) : FAIL; | |
059ec3d9 PH |
2972 | break; |
2973 | ||
71fafd95 | 2974 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
8523533c TK |
2975 | case ACLC_BMI_OPTIN: |
2976 | { | |
2977 | int old_pool = store_pool; | |
2978 | store_pool = POOL_PERM; | |
2979 | bmi_current_optin = string_copy(arg); | |
2980 | store_pool = old_pool; | |
2981 | } | |
2982 | break; | |
71fafd95 | 2983 | #endif |
8523533c | 2984 | |
059ec3d9 | 2985 | case ACLC_CONDITION: |
f3766eb5 NM |
2986 | /* The true/false parsing here should be kept in sync with that used in |
2987 | expand.c when dealing with ECOND_BOOL so that we don't have too many | |
2988 | different definitions of what can be a boolean. */ | |
51c7471d JH |
2989 | if (*arg == '-' |
2990 | ? Ustrspn(arg+1, "0123456789") == Ustrlen(arg+1) /* Negative number */ | |
2991 | : Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */ | |
059ec3d9 PH |
2992 | rc = (Uatoi(arg) == 0)? FAIL : OK; |
2993 | else | |
2994 | rc = (strcmpic(arg, US"no") == 0 || | |
2995 | strcmpic(arg, US"false") == 0)? FAIL : | |
2996 | (strcmpic(arg, US"yes") == 0 || | |
2997 | strcmpic(arg, US"true") == 0)? OK : DEFER; | |
2998 | if (rc == DEFER) | |
2999 | *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg); | |
3000 | break; | |
3001 | ||
c3611384 PH |
3002 | case ACLC_CONTINUE: /* Always succeeds */ |
3003 | break; | |
3004 | ||
059ec3d9 | 3005 | case ACLC_CONTROL: |
c5fcb476 | 3006 | { |
55414b25 JH |
3007 | const uschar *p = NULL; |
3008 | control_type = decode_control(arg, &p, where, log_msgptr); | |
4840604e | 3009 | |
55414b25 | 3010 | /* Check if this control makes sense at this time */ |
f7572e5a | 3011 | |
d7bed771 | 3012 | if (controls_list[control_type].forbids & (1 << where)) |
55414b25 JH |
3013 | { |
3014 | *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL", | |
d7bed771 | 3015 | controls_list[control_type].name, acl_wherenames[where]); |
55414b25 JH |
3016 | return ERROR; |
3017 | } | |
8800895a | 3018 | |
55414b25 JH |
3019 | switch(control_type) |
3020 | { | |
3021 | case CONTROL_AUTH_UNADVERTISED: | |
8768d548 | 3022 | f.allow_auth_unadvertised = TRUE; |
55414b25 JH |
3023 | break; |
3024 | ||
3025 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
3026 | case CONTROL_BMI_RUN: | |
3027 | bmi_run = 1; | |
3028 | break; | |
3029 | #endif | |
3030 | ||
1a2e76e1 | 3031 | #ifndef DISABLE_DKIM |
55414b25 | 3032 | case CONTROL_DKIM_VERIFY: |
8768d548 | 3033 | f.dkim_disable_verify = TRUE; |
1a2e76e1 | 3034 | # ifdef SUPPORT_DMARC |
55414b25 | 3035 | /* Since DKIM was blocked, skip DMARC too */ |
8768d548 JH |
3036 | f.dmarc_disable_verify = TRUE; |
3037 | f.dmarc_enable_forensic = FALSE; | |
1a2e76e1 | 3038 | # endif |
55414b25 | 3039 | break; |
1a2e76e1 | 3040 | #endif |
55414b25 | 3041 | |
1a2e76e1 | 3042 | #ifdef SUPPORT_DMARC |
55414b25 | 3043 | case CONTROL_DMARC_VERIFY: |
8768d548 | 3044 | f.dmarc_disable_verify = TRUE; |
55414b25 JH |
3045 | break; |
3046 | ||
3047 | case CONTROL_DMARC_FORENSIC: | |
8768d548 | 3048 | f.dmarc_enable_forensic = TRUE; |
55414b25 | 3049 | break; |
1a2e76e1 | 3050 | #endif |
55414b25 JH |
3051 | |
3052 | case CONTROL_DSCP: | |
3053 | if (*p == '/') | |
3054 | { | |
3055 | int fd, af, level, optname, value; | |
3056 | /* If we are acting on stdin, the setsockopt may fail if stdin is not | |
3057 | a socket; we can accept that, we'll just debug-log failures anyway. */ | |
3058 | fd = fileno(smtp_in); | |
3059 | af = ip_get_address_family(fd); | |
3060 | if (af < 0) | |
3061 | { | |
3062 | HDEBUG(D_acl) | |
e1d04f48 | 3063 | debug_printf_indent("smtp input is probably not a socket [%s], not setting DSCP\n", |
55414b25 JH |
3064 | strerror(errno)); |
3065 | break; | |
3066 | } | |
3067 | if (dscp_lookup(p+1, af, &level, &optname, &value)) | |
3068 | { | |
3069 | if (setsockopt(fd, level, optname, &value, sizeof(value)) < 0) | |
3070 | { | |
e1d04f48 | 3071 | HDEBUG(D_acl) debug_printf_indent("failed to set input DSCP[%s]: %s\n", |
55414b25 JH |
3072 | p+1, strerror(errno)); |
3073 | } | |
3074 | else | |
3075 | { | |
e1d04f48 | 3076 | HDEBUG(D_acl) debug_printf_indent("set input DSCP to \"%s\"\n", p+1); |
55414b25 JH |
3077 | } |
3078 | } | |
3079 | else | |
3080 | { | |
3081 | *log_msgptr = string_sprintf("unrecognised DSCP value in \"control=%s\"", arg); | |
3082 | return ERROR; | |
3083 | } | |
3084 | } | |
3085 | else | |
3086 | { | |
3087 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3088 | return ERROR; | |
3089 | } | |
3090 | break; | |
3091 | ||
3092 | case CONTROL_ERROR: | |
3093 | return ERROR; | |
3094 | ||
3095 | case CONTROL_CASEFUL_LOCAL_PART: | |
3096 | deliver_localpart = addr->cc_local_part; | |
3097 | break; | |
3098 | ||
3099 | case CONTROL_CASELOWER_LOCAL_PART: | |
3100 | deliver_localpart = addr->lc_local_part; | |
3101 | break; | |
3102 | ||
3103 | case CONTROL_ENFORCE_SYNC: | |
3104 | smtp_enforce_sync = TRUE; | |
3105 | break; | |
3106 | ||
3107 | case CONTROL_NO_ENFORCE_SYNC: | |
3108 | smtp_enforce_sync = FALSE; | |
3109 | break; | |
3110 | ||
3111 | #ifdef WITH_CONTENT_SCAN | |
3112 | case CONTROL_NO_MBOX_UNSPOOL: | |
8768d548 | 3113 | f.no_mbox_unspool = TRUE; |
55414b25 JH |
3114 | break; |
3115 | #endif | |
3116 | ||
3117 | case CONTROL_NO_MULTILINE: | |
8768d548 | 3118 | f.no_multiline_responses = TRUE; |
55414b25 JH |
3119 | break; |
3120 | ||
3121 | case CONTROL_NO_PIPELINING: | |
8768d548 | 3122 | f.pipelining_enable = FALSE; |
55414b25 JH |
3123 | break; |
3124 | ||
3125 | case CONTROL_NO_DELAY_FLUSH: | |
8768d548 | 3126 | f.disable_delay_flush = TRUE; |
55414b25 JH |
3127 | break; |
3128 | ||
3129 | case CONTROL_NO_CALLOUT_FLUSH: | |
8768d548 | 3130 | f.disable_callout_flush = TRUE; |
55414b25 JH |
3131 | break; |
3132 | ||
3133 | case CONTROL_FAKEREJECT: | |
57cc2785 | 3134 | cancel_cutthrough_connection(TRUE, US"fakereject"); |
55414b25 JH |
3135 | case CONTROL_FAKEDEFER: |
3136 | fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL; | |
3137 | if (*p == '/') | |
3138 | { | |
3139 | const uschar *pp = p + 1; | |
d7978c0f | 3140 | while (*pp) pp++; |
55414b25 JH |
3141 | fake_response_text = expand_string(string_copyn(p+1, pp-p-1)); |
3142 | p = pp; | |
3143 | } | |
3144 | else | |
3145 | { | |
3146 | /* Explicitly reset to default string */ | |
3147 | fake_response_text = US"Your message has been rejected but is being kept for evaluation.\nIf it was a legitimate message, it may still be delivered to the target recipient(s)."; | |
3148 | } | |
3149 | break; | |
ed7f7860 | 3150 | |
55414b25 | 3151 | case CONTROL_FREEZE: |
8768d548 | 3152 | f.deliver_freeze = TRUE; |
55414b25 JH |
3153 | deliver_frozen_at = time(NULL); |
3154 | freeze_tell = freeze_tell_config; /* Reset to configured value */ | |
3155 | if (Ustrncmp(p, "/no_tell", 8) == 0) | |
3156 | { | |
3157 | p += 8; | |
3158 | freeze_tell = NULL; | |
3159 | } | |
3160 | if (*p != 0) | |
3161 | { | |
3162 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3163 | return ERROR; | |
3164 | } | |
57cc2785 | 3165 | cancel_cutthrough_connection(TRUE, US"item frozen"); |
55414b25 JH |
3166 | break; |
3167 | ||
3168 | case CONTROL_QUEUE_ONLY: | |
8768d548 | 3169 | f.queue_only_policy = TRUE; |
57cc2785 | 3170 | cancel_cutthrough_connection(TRUE, US"queueing forced"); |
55414b25 JH |
3171 | break; |
3172 | ||
3173 | case CONTROL_SUBMISSION: | |
3174 | originator_name = US""; | |
8768d548 | 3175 | f.submission_mode = TRUE; |
55414b25 JH |
3176 | while (*p == '/') |
3177 | { | |
3178 | if (Ustrncmp(p, "/sender_retain", 14) == 0) | |
3179 | { | |
3180 | p += 14; | |
8768d548 JH |
3181 | f.active_local_sender_retain = TRUE; |
3182 | f.active_local_from_check = FALSE; | |
55414b25 JH |
3183 | } |
3184 | else if (Ustrncmp(p, "/domain=", 8) == 0) | |
3185 | { | |
3186 | const uschar *pp = p + 8; | |
d7978c0f | 3187 | while (*pp && *pp != '/') pp++; |
55414b25 JH |
3188 | submission_domain = string_copyn(p+8, pp-p-8); |
3189 | p = pp; | |
3190 | } | |
3191 | /* The name= option must be last, because it swallows the rest of | |
3192 | the string. */ | |
3193 | else if (Ustrncmp(p, "/name=", 6) == 0) | |
3194 | { | |
3195 | const uschar *pp = p + 6; | |
d7978c0f | 3196 | while (*pp) pp++; |
55414b25 JH |
3197 | submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6, |
3198 | big_buffer, big_buffer_size)); | |
3199 | p = pp; | |
3200 | } | |
3201 | else break; | |
3202 | } | |
3203 | if (*p != 0) | |
3204 | { | |
3205 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3206 | return ERROR; | |
3207 | } | |
3208 | break; | |
e4bdf652 | 3209 | |
55414b25 | 3210 | case CONTROL_DEBUG: |
55414b25 | 3211 | { |
b0d68adc JH |
3212 | uschar * debug_tag = NULL; |
3213 | uschar * debug_opts = NULL; | |
3214 | BOOL kill = FALSE; | |
3215 | ||
3216 | while (*p == '/') | |
55414b25 | 3217 | { |
b0d68adc JH |
3218 | const uschar * pp = p+1; |
3219 | if (Ustrncmp(pp, "tag=", 4) == 0) | |
3220 | { | |
3221 | for (pp += 4; *pp && *pp != '/';) pp++; | |
3222 | debug_tag = string_copyn(p+5, pp-p-5); | |
3223 | } | |
3224 | else if (Ustrncmp(pp, "opts=", 5) == 0) | |
3225 | { | |
3226 | for (pp += 5; *pp && *pp != '/';) pp++; | |
3227 | debug_opts = string_copyn(p+6, pp-p-6); | |
3228 | } | |
3229 | else if (Ustrncmp(pp, "kill", 4) == 0) | |
3230 | { | |
3231 | for (pp += 4; *pp && *pp != '/';) pp++; | |
3232 | kill = TRUE; | |
3233 | } | |
3234 | else | |
3235 | while (*pp && *pp != '/') pp++; | |
55414b25 JH |
3236 | p = pp; |
3237 | } | |
b0d68adc JH |
3238 | |
3239 | if (kill) | |
3240 | debug_logging_stop(); | |
3241 | else | |
3242 | debug_logging_activate(debug_tag, debug_opts); | |
55414b25 | 3243 | } |
55414b25 JH |
3244 | break; |
3245 | ||
3246 | case CONTROL_SUPPRESS_LOCAL_FIXUPS: | |
8768d548 | 3247 | f.suppress_local_fixups = TRUE; |
55414b25 JH |
3248 | break; |
3249 | ||
3250 | case CONTROL_CUTTHROUGH_DELIVERY: | |
051d5efa JH |
3251 | { |
3252 | uschar * ignored = NULL; | |
a2b89db1 | 3253 | #ifndef DISABLE_PRDR |
55414b25 | 3254 | if (prdr_requested) |
a2b89db1 PP |
3255 | #else |
3256 | if (0) | |
3257 | #endif | |
55414b25 JH |
3258 | /* Too hard to think about for now. We might in future cutthrough |
3259 | the case where both sides handle prdr and this-node prdr acl | |
3260 | is "accept" */ | |
051d5efa | 3261 | ignored = US"PRDR active"; |
5032d1cf JH |
3262 | else |
3263 | { | |
8768d548 | 3264 | if (f.deliver_freeze) |
051d5efa | 3265 | ignored = US"frozen"; |
8768d548 | 3266 | else if (f.queue_only_policy) |
051d5efa | 3267 | ignored = US"queue-only"; |
55414b25 | 3268 | else if (fake_response == FAIL) |
051d5efa | 3269 | ignored = US"fakereject"; |
55414b25 JH |
3270 | else |
3271 | { | |
ff5929e3 JH |
3272 | if (rcpt_count == 1) |
3273 | { | |
051d5efa | 3274 | cutthrough.delivery = TRUE; /* control accepted */ |
ff5929e3 JH |
3275 | while (*p == '/') |
3276 | { | |
3277 | const uschar * pp = p+1; | |
3278 | if (Ustrncmp(pp, "defer=", 6) == 0) | |
3279 | { | |
3280 | pp += 6; | |
3281 | if (Ustrncmp(pp, "pass", 4) == 0) cutthrough.defer_pass = TRUE; | |
3282 | /* else if (Ustrncmp(pp, "spool") == 0) ; default */ | |
3283 | } | |
3284 | else | |
3285 | while (*pp && *pp != '/') pp++; | |
3286 | p = pp; | |
3287 | } | |
3288 | } | |
06fdb9f7 | 3289 | else |
051d5efa | 3290 | ignored = US"nonfirst rcpt"; |
55414b25 | 3291 | } |
5032d1cf | 3292 | } |
051d5efa JH |
3293 | DEBUG(D_acl) if (ignored) |
3294 | debug_printf(" cutthrough request ignored on %s item\n", ignored); | |
3295 | } | |
3296 | break; | |
3c8b3577 | 3297 | |
8c5d388a | 3298 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
3299 | case CONTROL_UTF8_DOWNCONVERT: |
3300 | if (*p == '/') | |
3301 | { | |
921dfc11 JH |
3302 | if (p[1] == '1') |
3303 | { | |
3304 | message_utf8_downconvert = 1; | |
3305 | addr->prop.utf8_downcvt = TRUE; | |
3306 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3307 | p += 2; | |
3308 | break; | |
3309 | } | |
3310 | if (p[1] == '0') | |
3311 | { | |
3312 | message_utf8_downconvert = 0; | |
3313 | addr->prop.utf8_downcvt = FALSE; | |
3314 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3315 | p += 2; | |
3316 | break; | |
3317 | } | |
3c8b3577 | 3318 | if (p[1] == '-' && p[2] == '1') |
921dfc11 JH |
3319 | { |
3320 | message_utf8_downconvert = -1; | |
3321 | addr->prop.utf8_downcvt = FALSE; | |
3322 | addr->prop.utf8_downcvt_maybe = TRUE; | |
3323 | p += 3; | |
3324 | break; | |
3325 | } | |
3c8b3577 JH |
3326 | *log_msgptr = US"bad option value for control=utf8_downconvert"; |
3327 | } | |
3328 | else | |
3329 | { | |
921dfc11 JH |
3330 | message_utf8_downconvert = 1; |
3331 | addr->prop.utf8_downcvt = TRUE; | |
3332 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3333 | break; | |
3c8b3577 JH |
3334 | } |
3335 | return ERROR; | |
8c5d388a | 3336 | #endif |
3c8b3577 | 3337 | |
9171d434 | 3338 | } |
55414b25 | 3339 | break; |
059ec3d9 | 3340 | } |
059ec3d9 | 3341 | |
6a8f9482 TK |
3342 | #ifdef EXPERIMENTAL_DCC |
3343 | case ACLC_DCC: | |
3344 | { | |
4c04137d | 3345 | /* Separate the regular expression and any optional parameters. */ |
55414b25 JH |
3346 | const uschar * list = arg; |
3347 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
6a8f9482 TK |
3348 | /* Run the dcc backend. */ |
3349 | rc = dcc_process(&ss); | |
4c04137d | 3350 | /* Modify return code based upon the existence of options. */ |
3c8b3577 | 3351 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) |
6a8f9482 | 3352 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) |
3c8b3577 | 3353 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ |
6a8f9482 TK |
3354 | } |
3355 | break; | |
3356 | #endif | |
3357 | ||
71fafd95 | 3358 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3359 | case ACLC_DECODE: |
3360 | rc = mime_decode(&arg); | |
3361 | break; | |
71fafd95 | 3362 | #endif |
8523533c | 3363 | |
059ec3d9 PH |
3364 | case ACLC_DELAY: |
3365 | { | |
3366 | int delay = readconf_readtime(arg, 0, FALSE); | |
3367 | if (delay < 0) | |
3368 | { | |
3369 | *log_msgptr = string_sprintf("syntax error in argument for \"delay\" " | |
3370 | "modifier: \"%s\" is not a time value", arg); | |
3371 | return ERROR; | |
3372 | } | |
3373 | else | |
3374 | { | |
e1d04f48 | 3375 | HDEBUG(D_acl) debug_printf_indent("delay modifier requests %d-second delay\n", |
059ec3d9 PH |
3376 | delay); |
3377 | if (host_checking) | |
3378 | { | |
3379 | HDEBUG(D_acl) | |
e1d04f48 | 3380 | debug_printf_indent("delay skipped in -bh checking mode\n"); |
059ec3d9 | 3381 | } |
010c2d14 | 3382 | |
ae9d18bc JH |
3383 | /* NOTE 1: Remember that we may be |
3384 | dealing with stdin/stdout here, in addition to TCP/IP connections. | |
3385 | Also, delays may be specified for non-SMTP input, where smtp_out and | |
3386 | smtp_in will be NULL. Whatever is done must work in all cases. | |
3387 | ||
3388 | NOTE 2: The added feature of flushing the output before a delay must | |
3389 | apply only to SMTP input. Hence the test for smtp_out being non-NULL. | |
3390 | */ | |
3391 | ||
3392 | else | |
3393 | { | |
02c30a32 | 3394 | if (smtp_out && !f.disable_delay_flush) |
ae9d18bc JH |
3395 | mac_smtp_fflush(); |
3396 | ||
861a7c51 | 3397 | #if !defined(NO_POLL_H) && defined (POLLRDHUP) |
ae9d18bc JH |
3398 | { |
3399 | struct pollfd p; | |
3400 | nfds_t n = 0; | |
3401 | if (smtp_out) | |
3402 | { | |
3403 | p.fd = fileno(smtp_out); | |
3404 | p.events = POLLRDHUP; | |
3405 | n = 1; | |
3406 | } | |
3407 | if (poll(&p, n, delay*1000) > 0) | |
e1d04f48 | 3408 | HDEBUG(D_acl) debug_printf_indent("delay cancelled by peer close\n"); |
ae9d18bc JH |
3409 | } |
3410 | #else | |
02c30a32 JH |
3411 | /* Lacking POLLRDHUP it appears to be impossible to detect that a |
3412 | TCP/IP connection has gone away without reading from it. This means | |
3413 | that we cannot shorten the delay below if the client goes away, | |
3414 | because we cannot discover that the client has closed its end of the | |
3415 | connection. (The connection is actually in a half-closed state, | |
3416 | waiting for the server to close its end.) It would be nice to be able | |
3417 | to detect this state, so that the Exim process is not held up | |
3418 | unnecessarily. However, it seems that we can't. The poll() function | |
3419 | does not do the right thing, and in any case it is not always | |
3420 | available. */ | |
010c2d14 | 3421 | |
86b8287f | 3422 | while (delay > 0) delay = sleep(delay); |
ae9d18bc | 3423 | #endif |
8e669ac1 | 3424 | } |
059ec3d9 PH |
3425 | } |
3426 | } | |
3427 | break; | |
3428 | ||
80a47a2c TK |
3429 | #ifndef DISABLE_DKIM |
3430 | case ACLC_DKIM_SIGNER: | |
a79d8834 | 3431 | if (dkim_cur_signer) |
9e5d6b55 | 3432 | rc = match_isinlist(dkim_cur_signer, |
80a47a2c | 3433 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); |
80a47a2c | 3434 | else |
b0b9dbb1 | 3435 | rc = FAIL; |
71fafd95 PH |
3436 | break; |
3437 | ||
80a47a2c | 3438 | case ACLC_DKIM_STATUS: |
a79d8834 | 3439 | rc = match_isinlist(dkim_verify_status, |
80a47a2c | 3440 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); |
71fafd95 PH |
3441 | break; |
3442 | #endif | |
fb2274d4 | 3443 | |
1a2e76e1 | 3444 | #ifdef SUPPORT_DMARC |
4840604e | 3445 | case ACLC_DMARC_STATUS: |
8768d548 | 3446 | if (!f.dmarc_has_been_checked) |
4840604e | 3447 | dmarc_process(); |
8768d548 | 3448 | f.dmarc_has_been_checked = TRUE; |
4840604e TL |
3449 | /* used long way of dmarc_exim_expand_query() in case we need more |
3450 | * view into the process in the future. */ | |
3451 | rc = match_isinlist(dmarc_exim_expand_query(DMARC_VERIFY_STATUS), | |
3452 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); | |
3453 | break; | |
1a2e76e1 | 3454 | #endif |
4840604e | 3455 | |
059ec3d9 | 3456 | case ACLC_DNSLISTS: |
379ba7d0 | 3457 | rc = verify_check_dnsbl(where, &arg, log_msgptr); |
059ec3d9 PH |
3458 | break; |
3459 | ||
3460 | case ACLC_DOMAINS: | |
3461 | rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor, | |
55414b25 | 3462 | addr->domain_cache, MCL_DOMAIN, TRUE, CUSS &deliver_domain_data); |
059ec3d9 PH |
3463 | break; |
3464 | ||
3465 | /* The value in tls_cipher is the full cipher name, for example, | |
3466 | TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the | |
3467 | cipher names such as DES-CBC3-SHA. But program defensively. We don't know | |
3468 | what may in practice come out of the SSL library - which at the time of | |
3469 | writing is poorly documented. */ | |
3470 | ||
3471 | case ACLC_ENCRYPTED: | |
817d9f57 | 3472 | if (tls_in.cipher == NULL) rc = FAIL; else |
059ec3d9 PH |
3473 | { |
3474 | uschar *endcipher = NULL; | |
817d9f57 JH |
3475 | uschar *cipher = Ustrchr(tls_in.cipher, ':'); |
3476 | if (cipher == NULL) cipher = tls_in.cipher; else | |
059ec3d9 PH |
3477 | { |
3478 | endcipher = Ustrchr(++cipher, ':'); | |
3479 | if (endcipher != NULL) *endcipher = 0; | |
3480 | } | |
3481 | rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL); | |
3482 | if (endcipher != NULL) *endcipher = ':'; | |
3483 | } | |
3484 | break; | |
3485 | ||
3486 | /* Use verify_check_this_host() instead of verify_check_host() so that | |
3487 | we can pass over &host_data to catch any looked up data. Once it has been | |
3488 | set, it retains its value so that it's still there if another ACL verb | |
3489 | comes through here and uses the cache. However, we must put it into | |
3490 | permanent store in case it is also expected to be used in a subsequent | |
3491 | message in the same SMTP connection. */ | |
3492 | ||
3493 | case ACLC_HOSTS: | |
3494 | rc = verify_check_this_host(&arg, sender_host_cache, NULL, | |
55414b25 JH |
3495 | (sender_host_address == NULL)? US"" : sender_host_address, |
3496 | CUSS &host_data); | |
4a452c43 | 3497 | if (rc == DEFER) *log_msgptr = search_error_message; |
f3ebb786 | 3498 | if (host_data) host_data = string_copy_perm(host_data, TRUE); |
059ec3d9 PH |
3499 | break; |
3500 | ||
3501 | case ACLC_LOCAL_PARTS: | |
3502 | rc = match_isinlist(addr->cc_local_part, &arg, 0, | |
3503 | &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE, | |
55414b25 | 3504 | CUSS &deliver_localpart_data); |
059ec3d9 PH |
3505 | break; |
3506 | ||
6ea85e9a PH |
3507 | case ACLC_LOG_REJECT_TARGET: |
3508 | { | |
3509 | int logbits = 0; | |
3510 | int sep = 0; | |
55414b25 | 3511 | const uschar *s = arg; |
d7978c0f | 3512 | uschar * ss; |
4a452c43 | 3513 | while ((ss = string_nextinlist(&s, &sep, big_buffer, big_buffer_size))) |
6ea85e9a PH |
3514 | { |
3515 | if (Ustrcmp(ss, "main") == 0) logbits |= LOG_MAIN; | |
3516 | else if (Ustrcmp(ss, "panic") == 0) logbits |= LOG_PANIC; | |
3517 | else if (Ustrcmp(ss, "reject") == 0) logbits |= LOG_REJECT; | |
3518 | else | |
3519 | { | |
3520 | logbits |= LOG_MAIN|LOG_REJECT; | |
3521 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown log name \"%s\" in " | |
3522 | "\"log_reject_target\" in %s ACL", ss, acl_wherenames[where]); | |
3523 | } | |
3524 | } | |
3525 | log_reject_target = logbits; | |
3526 | } | |
3527 | break; | |
3528 | ||
059ec3d9 PH |
3529 | case ACLC_LOGWRITE: |
3530 | { | |
3531 | int logbits = 0; | |
55414b25 | 3532 | const uschar *s = arg; |
059ec3d9 PH |
3533 | if (*s == ':') |
3534 | { | |
3535 | s++; | |
3536 | while (*s != ':') | |
3537 | { | |
3538 | if (Ustrncmp(s, "main", 4) == 0) | |
3539 | { logbits |= LOG_MAIN; s += 4; } | |
3540 | else if (Ustrncmp(s, "panic", 5) == 0) | |
3541 | { logbits |= LOG_PANIC; s += 5; } | |
3542 | else if (Ustrncmp(s, "reject", 6) == 0) | |
3543 | { logbits |= LOG_REJECT; s += 6; } | |
3544 | else | |
3545 | { | |
3546 | logbits = LOG_MAIN|LOG_PANIC; | |
3547 | s = string_sprintf(":unknown log name in \"%s\" in " | |
3548 | "\"logwrite\" in %s ACL", arg, acl_wherenames[where]); | |
3549 | } | |
3550 | if (*s == ',') s++; | |
3551 | } | |
3552 | s++; | |
3553 | } | |
3554 | while (isspace(*s)) s++; | |
6ea85e9a | 3555 | |
059ec3d9 PH |
3556 | if (logbits == 0) logbits = LOG_MAIN; |
3557 | log_write(0, logbits, "%s", string_printing(s)); | |
3558 | } | |
3559 | break; | |
8e669ac1 | 3560 | |
71fafd95 | 3561 | #ifdef WITH_CONTENT_SCAN |
0f0c8159 | 3562 | case ACLC_MALWARE: /* Run the malware backend. */ |
8523533c | 3563 | { |
6ea85e9a | 3564 | /* Separate the regular expression and any optional parameters. */ |
55414b25 | 3565 | const uschar * list = arg; |
d7978c0f JH |
3566 | uschar * ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); |
3567 | uschar * opt; | |
0f0c8159 JH |
3568 | BOOL defer_ok = FALSE; |
3569 | int timeout = 0; | |
3570 | ||
55414b25 | 3571 | while ((opt = string_nextinlist(&list, &sep, NULL, 0))) |
0f0c8159 JH |
3572 | if (strcmpic(opt, US"defer_ok") == 0) |
3573 | defer_ok = TRUE; | |
3574 | else if ( strncmpic(opt, US"tmo=", 4) == 0 | |
3575 | && (timeout = readconf_readtime(opt+4, '\0', FALSE)) < 0 | |
3576 | ) | |
3577 | { | |
3578 | *log_msgptr = string_sprintf("bad timeout value in '%s'", opt); | |
3579 | return ERROR; | |
3580 | } | |
3581 | ||
3582 | rc = malware(ss, timeout); | |
3583 | if (rc == DEFER && defer_ok) | |
3584 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ | |
8523533c TK |
3585 | } |
3586 | break; | |
3587 | ||
3588 | case ACLC_MIME_REGEX: | |
71fafd95 | 3589 | rc = mime_regex(&arg); |
8523533c | 3590 | break; |
71fafd95 | 3591 | #endif |
059ec3d9 | 3592 | |
b0b9dbb1 | 3593 | case ACLC_QUEUE: |
944e8b37 JH |
3594 | if (Ustrchr(arg, '/')) |
3595 | { | |
3596 | *log_msgptr = string_sprintf( | |
3597 | "Directory separator not permitted in queue name: '%s'", arg); | |
3598 | return ERROR; | |
3599 | } | |
f3ebb786 | 3600 | queue_name = string_copy_perm(arg, FALSE); |
b0b9dbb1 JH |
3601 | break; |
3602 | ||
870f6ba8 | 3603 | case ACLC_RATELIMIT: |
90fc3069 | 3604 | rc = acl_ratelimit(arg, where, log_msgptr); |
870f6ba8 TF |
3605 | break; |
3606 | ||
059ec3d9 | 3607 | case ACLC_RECIPIENTS: |
36d295f1 | 3608 | rc = match_address_list(CUS addr->address, TRUE, TRUE, &arg, NULL, -1, 0, |
55414b25 | 3609 | CUSS &recipient_data); |
059ec3d9 PH |
3610 | break; |
3611 | ||
71fafd95 PH |
3612 | #ifdef WITH_CONTENT_SCAN |
3613 | case ACLC_REGEX: | |
3614 | rc = regex(&arg); | |
8523533c | 3615 | break; |
71fafd95 | 3616 | #endif |
8523533c | 3617 | |
e7568d51 TL |
3618 | case ACLC_REMOVE_HEADER: |
3619 | setup_remove_header(arg); | |
3620 | break; | |
3621 | ||
059ec3d9 PH |
3622 | case ACLC_SENDER_DOMAINS: |
3623 | { | |
3624 | uschar *sdomain; | |
3625 | sdomain = Ustrrchr(sender_address, '@'); | |
f7ae7462 | 3626 | sdomain = sdomain ? sdomain + 1 : US""; |
059ec3d9 PH |
3627 | rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor, |
3628 | sender_domain_cache, MCL_DOMAIN, TRUE, NULL); | |
3629 | } | |
3630 | break; | |
3631 | ||
3632 | case ACLC_SENDERS: | |
36d295f1 | 3633 | rc = match_address_list(CUS sender_address, TRUE, TRUE, &arg, |
55414b25 | 3634 | sender_address_cache, -1, 0, CUSS &sender_data); |
059ec3d9 PH |
3635 | break; |
3636 | ||
3637 | /* Connection variables must persist forever */ | |
3638 | ||
3639 | case ACLC_SET: | |
3640 | { | |
3641 | int old_pool = store_pool; | |
5ef5dd52 | 3642 | if ( cb->u.varname[0] == 'c' |
a79d8834 JH |
3643 | #ifndef DISABLE_DKIM |
3644 | || cb->u.varname[0] == 'd' | |
3645 | #endif | |
0cbf2b82 | 3646 | #ifndef DISABLE_EVENT |
5ef5dd52 JB |
3647 | || event_name /* An event is being delivered */ |
3648 | #endif | |
3649 | ) | |
3650 | store_pool = POOL_PERM; | |
a79d8834 JH |
3651 | #ifndef DISABLE_DKIM /* Overwriteable dkim result variables */ |
3652 | if (Ustrcmp(cb->u.varname, "dkim_verify_status") == 0) | |
3653 | dkim_verify_status = string_copy(arg); | |
3654 | else if (Ustrcmp(cb->u.varname, "dkim_verify_reason") == 0) | |
3655 | dkim_verify_reason = string_copy(arg); | |
3656 | else | |
3657 | #endif | |
3658 | acl_var_create(cb->u.varname)->data.ptr = string_copy(arg); | |
059ec3d9 PH |
3659 | store_pool = old_pool; |
3660 | } | |
3661 | break; | |
3662 | ||
eb52e2cb | 3663 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3664 | case ACLC_SPAM: |
3665 | { | |
4c04137d | 3666 | /* Separate the regular expression and any optional parameters. */ |
55414b25 JH |
3667 | const uschar * list = arg; |
3668 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
eb52e2cb | 3669 | |
55414b25 | 3670 | rc = spam(CUSS &ss); |
4c04137d | 3671 | /* Modify return code based upon the existence of options. */ |
eb52e2cb | 3672 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) |
8523533c | 3673 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) |
eb52e2cb | 3674 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ |
8523533c TK |
3675 | } |
3676 | break; | |
eb52e2cb | 3677 | #endif |
8523533c | 3678 | |
7952eef9 | 3679 | #ifdef SUPPORT_SPF |
8523533c | 3680 | case ACLC_SPF: |
65a7d8c3 NM |
3681 | rc = spf_process(&arg, sender_address, SPF_PROCESS_NORMAL); |
3682 | break; | |
3683 | case ACLC_SPF_GUESS: | |
3684 | rc = spf_process(&arg, sender_address, SPF_PROCESS_GUESS); | |
8523533c | 3685 | break; |
eb52e2cb | 3686 | #endif |
8523533c | 3687 | |
b0019c78 TF |
3688 | case ACLC_UDPSEND: |
3689 | rc = acl_udpsend(arg, log_msgptr); | |
3690 | break; | |
3691 | ||
059ec3d9 PH |
3692 | /* If the verb is WARN, discard any user message from verification, because |
3693 | such messages are SMTP responses, not header additions. The latter come | |
475fe28a PH |
3694 | only from explicit "message" modifiers. However, put the user message into |
3695 | $acl_verify_message so it can be used in subsequent conditions or modifiers | |
3696 | (until something changes it). */ | |
059ec3d9 PH |
3697 | |
3698 | case ACLC_VERIFY: | |
3699 | rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno); | |
3703d818 JH |
3700 | if (*user_msgptr) |
3701 | acl_verify_message = *user_msgptr; | |
059ec3d9 PH |
3702 | if (verb == ACL_WARN) *user_msgptr = NULL; |
3703 | break; | |
3704 | ||
3705 | default: | |
3706 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown " | |
3707 | "condition %d", cb->type); | |
3708 | break; | |
3709 | } | |
3710 | ||
3711 | /* If a condition was negated, invert OK/FAIL. */ | |
3712 | ||
2d009132 | 3713 | if (!conditions[cb->type].is_modifier && cb->u.negated) |
059ec3d9 | 3714 | if (rc == OK) rc = FAIL; |
2d009132 | 3715 | else if (rc == FAIL || rc == FAIL_DROP) rc = OK; |
059ec3d9 PH |
3716 | |
3717 | if (rc != OK) break; /* Conditions loop */ | |
3718 | } | |
3719 | ||
3720 | ||
3721 | /* If the result is the one for which "message" and/or "log_message" are used, | |
4e88a19f PH |
3722 | handle the values of these modifiers. If there isn't a log message set, we make |
3723 | it the same as the user message. | |
059ec3d9 PH |
3724 | |
3725 | "message" is a user message that will be included in an SMTP response. Unless | |
3726 | it is empty, it overrides any previously set user message. | |
3727 | ||
3728 | "log_message" is a non-user message, and it adds to any existing non-user | |
3729 | message that is already set. | |
3730 | ||
4e88a19f PH |
3731 | Most verbs have but a single return for which the messages are relevant, but |
3732 | for "discard", it's useful to have the log message both when it succeeds and | |
3733 | when it fails. For "accept", the message is used in the OK case if there is no | |
3734 | "endpass", but (for backwards compatibility) in the FAIL case if "endpass" is | |
3735 | present. */ | |
059ec3d9 | 3736 | |
4e88a19f PH |
3737 | if (*epp && rc == OK) user_message = NULL; |
3738 | ||
e3a69b62 | 3739 | if ((BIT(rc) & msgcond[verb]) != 0) |
059ec3d9 PH |
3740 | { |
3741 | uschar *expmessage; | |
4e88a19f PH |
3742 | uschar *old_user_msgptr = *user_msgptr; |
3743 | uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr; | |
059ec3d9 PH |
3744 | |
3745 | /* If the verb is "warn", messages generated by conditions (verification or | |
4e88a19f PH |
3746 | nested ACLs) are always discarded. This also happens for acceptance verbs |
3747 | when they actually do accept. Only messages specified at this level are used. | |
059ec3d9 PH |
3748 | However, the value of an existing message is available in $acl_verify_message |
3749 | during expansions. */ | |
3750 | ||
4e88a19f PH |
3751 | if (verb == ACL_WARN || |
3752 | (rc == OK && (verb == ACL_ACCEPT || verb == ACL_DISCARD))) | |
3753 | *log_msgptr = *user_msgptr = NULL; | |
059ec3d9 | 3754 | |
e3a69b62 | 3755 | if (user_message) |
059ec3d9 PH |
3756 | { |
3757 | acl_verify_message = old_user_msgptr; | |
3758 | expmessage = expand_string(user_message); | |
e3a69b62 | 3759 | if (!expmessage) |
059ec3d9 | 3760 | { |
8768d548 | 3761 | if (!f.expand_string_forcedfail) |
059ec3d9 PH |
3762 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", |
3763 | user_message, expand_string_message); | |
3764 | } | |
3765 | else if (expmessage[0] != 0) *user_msgptr = expmessage; | |
3766 | } | |
3767 | ||
e3a69b62 | 3768 | if (log_message) |
059ec3d9 PH |
3769 | { |
3770 | acl_verify_message = old_log_msgptr; | |
3771 | expmessage = expand_string(log_message); | |
e3a69b62 | 3772 | if (!expmessage) |
059ec3d9 | 3773 | { |
8768d548 | 3774 | if (!f.expand_string_forcedfail) |
059ec3d9 PH |
3775 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", |
3776 | log_message, expand_string_message); | |
3777 | } | |
3778 | else if (expmessage[0] != 0) | |
3779 | { | |
3780 | *log_msgptr = (*log_msgptr == NULL)? expmessage : | |
3781 | string_sprintf("%s: %s", expmessage, *log_msgptr); | |
3782 | } | |
3783 | } | |
3784 | ||
3785 | /* If no log message, default it to the user message */ | |
3786 | ||
e3a69b62 | 3787 | if (!*log_msgptr) *log_msgptr = *user_msgptr; |
059ec3d9 PH |
3788 | } |
3789 | ||
3790 | acl_verify_message = NULL; | |
3791 | return rc; | |
3792 | } | |
3793 | ||
3794 | ||
3795 | ||
3796 | ||
3797 | ||
3798 | /************************************************* | |
3799 | * Get line from a literal ACL * | |
3800 | *************************************************/ | |
3801 | ||
3802 | /* This function is passed to acl_read() in order to extract individual lines | |
3803 | of a literal ACL, which we access via static pointers. We can destroy the | |
3804 | contents because this is called only once (the compiled ACL is remembered). | |
3805 | ||
3806 | This code is intended to treat the data in the same way as lines in the main | |
3807 | Exim configuration file. That is: | |
3808 | ||
3809 | . Leading spaces are ignored. | |
3810 | ||
3811 | . A \ at the end of a line is a continuation - trailing spaces after the \ | |
3812 | are permitted (this is because I don't believe in making invisible things | |
3813 | significant). Leading spaces on the continued part of a line are ignored. | |
3814 | ||
3815 | . Physical lines starting (significantly) with # are totally ignored, and | |
3816 | may appear within a sequence of backslash-continued lines. | |
3817 | ||
3818 | . Blank lines are ignored, but will end a sequence of continuations. | |
3819 | ||
3820 | Arguments: none | |
3821 | Returns: a pointer to the next line | |
3822 | */ | |
3823 | ||
3824 | ||
3825 | static uschar *acl_text; /* Current pointer in the text */ | |
3826 | static uschar *acl_text_end; /* Points one past the terminating '0' */ | |
3827 | ||
3828 | ||
3829 | static uschar * | |
3830 | acl_getline(void) | |
3831 | { | |
3832 | uschar *yield; | |
3833 | ||
3834 | /* This loop handles leading blank lines and comments. */ | |
3835 | ||
3836 | for(;;) | |
3837 | { | |
3838 | while (isspace(*acl_text)) acl_text++; /* Leading spaces/empty lines */ | |
3839 | if (*acl_text == 0) return NULL; /* No more data */ | |
3840 | yield = acl_text; /* Potential data line */ | |
3841 | ||
d7978c0f | 3842 | while (*acl_text && *acl_text != '\n') acl_text++; |
059ec3d9 PH |
3843 | |
3844 | /* If we hit the end before a newline, we have the whole logical line. If | |
3845 | it's a comment, there's no more data to be given. Otherwise, yield it. */ | |
3846 | ||
3847 | if (*acl_text == 0) return (*yield == '#')? NULL : yield; | |
3848 | ||
3849 | /* After reaching a newline, end this loop if the physical line does not | |
3850 | start with '#'. If it does, it's a comment, and the loop continues. */ | |
3851 | ||
3852 | if (*yield != '#') break; | |
3853 | } | |
3854 | ||
3855 | /* This loop handles continuations. We know we have some real data, ending in | |
3856 | newline. See if there is a continuation marker at the end (ignoring trailing | |
3857 | white space). We know that *yield is not white space, so no need to test for | |
3858 | cont > yield in the backwards scanning loop. */ | |
3859 | ||
3860 | for(;;) | |
3861 | { | |
3862 | uschar *cont; | |
3863 | for (cont = acl_text - 1; isspace(*cont); cont--); | |
3864 | ||
3865 | /* If no continuation follows, we are done. Mark the end of the line and | |
3866 | return it. */ | |
3867 | ||
3868 | if (*cont != '\\') | |
3869 | { | |
3870 | *acl_text++ = 0; | |
3871 | return yield; | |
3872 | } | |
3873 | ||
3874 | /* We have encountered a continuation. Skip over whitespace at the start of | |
3875 | the next line, and indeed the whole of the next line or lines if they are | |
3876 | comment lines. */ | |
3877 | ||
3878 | for (;;) | |
3879 | { | |
3880 | while (*(++acl_text) == ' ' || *acl_text == '\t'); | |
3881 | if (*acl_text != '#') break; | |
3882 | while (*(++acl_text) != 0 && *acl_text != '\n'); | |
3883 | } | |
3884 | ||
3885 | /* We have the start of a continuation line. Move all the rest of the data | |
3886 | to join onto the previous line, and then find its end. If the end is not a | |
3887 | newline, we are done. Otherwise loop to look for another continuation. */ | |
3888 | ||
3889 | memmove(cont, acl_text, acl_text_end - acl_text); | |
3890 | acl_text_end -= acl_text - cont; | |
3891 | acl_text = cont; | |
3892 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3893 | if (*acl_text == 0) return yield; | |
3894 | } | |
3895 | ||
3896 | /* Control does not reach here */ | |
3897 | } | |
3898 | ||
3899 | ||
3900 | ||
3901 | ||
3902 | ||
3903 | /************************************************* | |
3904 | * Check access using an ACL * | |
3905 | *************************************************/ | |
3906 | ||
3907 | /* This function is called from address_check. It may recurse via | |
3908 | acl_check_condition() - hence the use of a level to stop looping. The ACL is | |
3909 | passed as a string which is expanded. A forced failure implies no access check | |
3910 | is required. If the result is a single word, it is taken as the name of an ACL | |
3911 | which is sought in the global ACL tree. Otherwise, it is taken as literal ACL | |
3912 | text, complete with newlines, and parsed as such. In both cases, the ACL check | |
3913 | is then run. This function uses an auxiliary function for acl_read() to call | |
3914 | for reading individual lines of a literal ACL. This is acl_getline(), which | |
3915 | appears immediately above. | |
3916 | ||
3917 | Arguments: | |
3918 | where where called from | |
3919 | addr address item when called from RCPT; otherwise NULL | |
3920 | s the input string; NULL is the same as an empty ACL => DENY | |
059ec3d9 PH |
3921 | user_msgptr where to put a user error (for SMTP response) |
3922 | log_msgptr where to put a logging message (not for SMTP response) | |
3923 | ||
3924 | Returns: OK access is granted | |
3925 | DISCARD access is apparently granted... | |
3926 | FAIL access is denied | |
3927 | FAIL_DROP access is denied; drop the connection | |
3928 | DEFER can't tell at the moment | |
3929 | ERROR disaster | |
3930 | */ | |
3931 | ||
3932 | static int | |
e1d04f48 | 3933 | acl_check_internal(int where, address_item *addr, uschar *s, |
059ec3d9 PH |
3934 | uschar **user_msgptr, uschar **log_msgptr) |
3935 | { | |
3936 | int fd = -1; | |
3937 | acl_block *acl = NULL; | |
3938 | uschar *acl_name = US"inline ACL"; | |
3939 | uschar *ss; | |
3940 | ||
3941 | /* Catch configuration loops */ | |
3942 | ||
e1d04f48 | 3943 | if (acl_level > 20) |
059ec3d9 PH |
3944 | { |
3945 | *log_msgptr = US"ACL nested too deep: possible loop"; | |
3946 | return ERROR; | |
3947 | } | |
3948 | ||
e1d04f48 | 3949 | if (!s) |
059ec3d9 | 3950 | { |
e1d04f48 | 3951 | HDEBUG(D_acl) debug_printf_indent("ACL is NULL: implicit DENY\n"); |
059ec3d9 PH |
3952 | return FAIL; |
3953 | } | |
3954 | ||
3955 | /* At top level, we expand the incoming string. At lower levels, it has already | |
3956 | been expanded as part of condition processing. */ | |
3957 | ||
e1d04f48 | 3958 | if (acl_level == 0) |
059ec3d9 | 3959 | { |
e1d04f48 | 3960 | if (!(ss = expand_string(s))) |
059ec3d9 | 3961 | { |
8768d548 | 3962 | if (f.expand_string_forcedfail) return OK; |
059ec3d9 PH |
3963 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s, |
3964 | expand_string_message); | |
3965 | return ERROR; | |
3966 | } | |
3967 | } | |
3968 | else ss = s; | |
3969 | ||
bb07bcd3 | 3970 | while (isspace(*ss)) ss++; |
059ec3d9 PH |
3971 | |
3972 | /* If we can't find a named ACL, the default is to parse it as an inline one. | |
3973 | (Unless it begins with a slash; non-existent files give rise to an error.) */ | |
3974 | ||
3975 | acl_text = ss; | |
3976 | ||
3977 | /* Handle the case of a string that does not contain any spaces. Look for a | |
3978 | named ACL among those read from the configuration, or a previously read file. | |
3979 | It is possible that the pointer to the ACL is NULL if the configuration | |
3980 | contains a name with no data. If not found, and the text begins with '/', | |
3981 | read an ACL from a file, and save it so it can be re-used. */ | |
3982 | ||
3983 | if (Ustrchr(ss, ' ') == NULL) | |
3984 | { | |
897024f1 JH |
3985 | tree_node * t = tree_search(acl_anchor, ss); |
3986 | if (t) | |
059ec3d9 | 3987 | { |
897024f1 | 3988 | if (!(acl = (acl_block *)(t->data.ptr))) |
059ec3d9 | 3989 | { |
e1d04f48 | 3990 | HDEBUG(D_acl) debug_printf_indent("ACL \"%s\" is empty: implicit DENY\n", ss); |
059ec3d9 PH |
3991 | return FAIL; |
3992 | } | |
3993 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
e1d04f48 | 3994 | HDEBUG(D_acl) debug_printf_indent("using ACL \"%s\"\n", ss); |
059ec3d9 PH |
3995 | } |
3996 | ||
3997 | else if (*ss == '/') | |
3998 | { | |
3999 | struct stat statbuf; | |
f3ebb786 JH |
4000 | if (is_tainted(ss)) |
4001 | { | |
4002 | log_write(0, LOG_MAIN|LOG_PANIC, | |
4003 | "attempt to open tainted ACL file name \"%s\"", ss); | |
4004 | /* Avoid leaking info to an attacker */ | |
4005 | *log_msgptr = US"internal configuration error"; | |
4006 | return ERROR; | |
4007 | } | |
897024f1 | 4008 | if ((fd = Uopen(ss, O_RDONLY, 0)) < 0) |
059ec3d9 PH |
4009 | { |
4010 | *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss, | |
4011 | strerror(errno)); | |
4012 | return ERROR; | |
4013 | } | |
059ec3d9 PH |
4014 | if (fstat(fd, &statbuf) != 0) |
4015 | { | |
4016 | *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss, | |
4017 | strerror(errno)); | |
4018 | return ERROR; | |
4019 | } | |
4020 | ||
f3ebb786 JH |
4021 | /* If the string being used as a filename is tainted, so is the file content */ |
4022 | acl_text = store_get(statbuf.st_size + 1, is_tainted(ss)); | |
059ec3d9 PH |
4023 | acl_text_end = acl_text + statbuf.st_size + 1; |
4024 | ||
4025 | if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size) | |
4026 | { | |
4027 | *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s", | |
4028 | ss, strerror(errno)); | |
4029 | return ERROR; | |
4030 | } | |
4031 | acl_text[statbuf.st_size] = 0; | |
f1e894f3 | 4032 | (void)close(fd); |
059ec3d9 PH |
4033 | |
4034 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
e1d04f48 | 4035 | HDEBUG(D_acl) debug_printf_indent("read ACL from file %s\n", ss); |
059ec3d9 PH |
4036 | } |
4037 | } | |
4038 | ||
4039 | /* Parse an ACL that is still in text form. If it came from a file, remember it | |
4040 | in the ACL tree, having read it into the POOL_PERM store pool so that it | |
4041 | persists between multiple messages. */ | |
4042 | ||
d7978c0f | 4043 | if (!acl) |
059ec3d9 PH |
4044 | { |
4045 | int old_pool = store_pool; | |
4046 | if (fd >= 0) store_pool = POOL_PERM; | |
4047 | acl = acl_read(acl_getline, log_msgptr); | |
4048 | store_pool = old_pool; | |
d7978c0f | 4049 | if (!acl && *log_msgptr) return ERROR; |
059ec3d9 PH |
4050 | if (fd >= 0) |
4051 | { | |
f3ebb786 | 4052 | tree_node *t = store_get_perm(sizeof(tree_node) + Ustrlen(ss), is_tainted(ss)); |
059ec3d9 PH |
4053 | Ustrcpy(t->name, ss); |
4054 | t->data.ptr = acl; | |
4055 | (void)tree_insertnode(&acl_anchor, t); | |
4056 | } | |
4057 | } | |
4058 | ||
4059 | /* Now we have an ACL to use. It's possible it may be NULL. */ | |
4060 | ||
d7978c0f | 4061 | while (acl) |
059ec3d9 PH |
4062 | { |
4063 | int cond; | |
4064 | int basic_errno = 0; | |
4065 | BOOL endpass_seen = FALSE; | |
e1d04f48 | 4066 | BOOL acl_quit_check = acl_level == 0 |
82c0c8ea | 4067 | && (where == ACL_WHERE_QUIT || where == ACL_WHERE_NOTQUIT); |
059ec3d9 PH |
4068 | |
4069 | *log_msgptr = *user_msgptr = NULL; | |
8768d548 | 4070 | f.acl_temp_details = FALSE; |
059ec3d9 | 4071 | |
897024f1 JH |
4072 | HDEBUG(D_acl) debug_printf_indent("processing \"%s\" (%s %d)\n", |
4073 | verbs[acl->verb], acl->srcfile, acl->srcline); | |
059ec3d9 PH |
4074 | |
4075 | /* Clear out any search error message from a previous check before testing | |
4076 | this condition. */ | |
4077 | ||
4078 | search_error_message = NULL; | |
e1d04f48 | 4079 | cond = acl_check_condition(acl->verb, acl->condition, where, addr, acl_level, |
059ec3d9 PH |
4080 | &endpass_seen, user_msgptr, log_msgptr, &basic_errno); |
4081 | ||
4082 | /* Handle special returns: DEFER causes a return except on a WARN verb; | |
4083 | ERROR always causes a return. */ | |
4084 | ||
4085 | switch (cond) | |
4086 | { | |
4087 | case DEFER: | |
897024f1 JH |
4088 | HDEBUG(D_acl) debug_printf_indent("%s: condition test deferred in %s\n", |
4089 | verbs[acl->verb], acl_name); | |
4090 | if (basic_errno != ERRNO_CALLOUTDEFER) | |
4091 | { | |
4092 | if (search_error_message != NULL && *search_error_message != 0) | |
4093 | *log_msgptr = search_error_message; | |
4094 | if (smtp_return_error_details) f.acl_temp_details = TRUE; | |
4095 | } | |
4096 | else | |
4097 | f.acl_temp_details = TRUE; | |
4098 | if (acl->verb != ACL_WARN) return DEFER; | |
4099 | break; | |
059ec3d9 PH |
4100 | |
4101 | default: /* Paranoia */ | |
4102 | case ERROR: | |
897024f1 JH |
4103 | HDEBUG(D_acl) debug_printf_indent("%s: condition test error in %s\n", |
4104 | verbs[acl->verb], acl_name); | |
4105 | return ERROR; | |
059ec3d9 PH |
4106 | |
4107 | case OK: | |
897024f1 JH |
4108 | HDEBUG(D_acl) debug_printf_indent("%s: condition test succeeded in %s\n", |
4109 | verbs[acl->verb], acl_name); | |
4110 | break; | |
059ec3d9 PH |
4111 | |
4112 | case FAIL: | |
897024f1 JH |
4113 | HDEBUG(D_acl) debug_printf_indent("%s: condition test failed in %s\n", |
4114 | verbs[acl->verb], acl_name); | |
4115 | break; | |
059ec3d9 PH |
4116 | |
4117 | /* DISCARD and DROP can happen only from a nested ACL condition, and | |
4118 | DISCARD can happen only for an "accept" or "discard" verb. */ | |
4119 | ||
4120 | case DISCARD: | |
897024f1 JH |
4121 | HDEBUG(D_acl) debug_printf_indent("%s: condition test yielded \"discard\" in %s\n", |
4122 | verbs[acl->verb], acl_name); | |
4123 | break; | |
059ec3d9 PH |
4124 | |
4125 | case FAIL_DROP: | |
897024f1 JH |
4126 | HDEBUG(D_acl) debug_printf_indent("%s: condition test yielded \"drop\" in %s\n", |
4127 | verbs[acl->verb], acl_name); | |
4128 | break; | |
059ec3d9 PH |
4129 | } |
4130 | ||
4131 | /* At this point, cond for most verbs is either OK or FAIL or (as a result of | |
4132 | a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and | |
4133 | for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */ | |
4134 | ||
4135 | switch(acl->verb) | |
4136 | { | |
4137 | case ACL_ACCEPT: | |
897024f1 JH |
4138 | if (cond == OK || cond == DISCARD) |
4139 | { | |
4140 | HDEBUG(D_acl) debug_printf_indent("end of %s: ACCEPT\n", acl_name); | |
4141 | return cond; | |
4142 | } | |
4143 | if (endpass_seen) | |
4144 | { | |
4145 | HDEBUG(D_acl) debug_printf_indent("accept: endpass encountered - denying access\n"); | |
4146 | return cond; | |
4147 | } | |
4148 | break; | |
059ec3d9 PH |
4149 | |
4150 | case ACL_DEFER: | |
897024f1 JH |
4151 | if (cond == OK) |
4152 | { | |
4153 | HDEBUG(D_acl) debug_printf_indent("end of %s: DEFER\n", acl_name); | |
4154 | if (acl_quit_check) goto badquit; | |
4155 | f.acl_temp_details = TRUE; | |
4156 | return DEFER; | |
4157 | } | |
4158 | break; | |
059ec3d9 PH |
4159 | |
4160 | case ACL_DENY: | |
897024f1 JH |
4161 | if (cond == OK) |
4162 | { | |
4163 | HDEBUG(D_acl) debug_printf_indent("end of %s: DENY\n", acl_name); | |
4164 | if (acl_quit_check) goto badquit; | |
4165 | return FAIL; | |
4166 | } | |
4167 | break; | |
059ec3d9 PH |
4168 | |
4169 | case ACL_DISCARD: | |
897024f1 JH |
4170 | if (cond == OK || cond == DISCARD) |
4171 | { | |
4172 | HDEBUG(D_acl) debug_printf_indent("end of %s: DISCARD\n", acl_name); | |
4173 | if (acl_quit_check) goto badquit; | |
4174 | return DISCARD; | |
4175 | } | |
4176 | if (endpass_seen) | |
4177 | { | |
4178 | HDEBUG(D_acl) | |
4179 | debug_printf_indent("discard: endpass encountered - denying access\n"); | |
4180 | return cond; | |
4181 | } | |
4182 | break; | |
059ec3d9 PH |
4183 | |
4184 | case ACL_DROP: | |
897024f1 JH |
4185 | if (cond == OK) |
4186 | { | |
4187 | HDEBUG(D_acl) debug_printf_indent("end of %s: DROP\n", acl_name); | |
4188 | if (acl_quit_check) goto badquit; | |
4189 | return FAIL_DROP; | |
4190 | } | |
4191 | break; | |
059ec3d9 PH |
4192 | |
4193 | case ACL_REQUIRE: | |
897024f1 JH |
4194 | if (cond != OK) |
4195 | { | |
4196 | HDEBUG(D_acl) debug_printf_indent("end of %s: not OK\n", acl_name); | |
4197 | if (acl_quit_check) goto badquit; | |
4198 | return cond; | |
4199 | } | |
4200 | break; | |
059ec3d9 PH |
4201 | |
4202 | case ACL_WARN: | |
897024f1 JH |
4203 | if (cond == OK) |
4204 | acl_warn(where, *user_msgptr, *log_msgptr); | |
4205 | else if (cond == DEFER && LOGGING(acl_warn_skipped)) | |
4206 | log_write(0, LOG_MAIN, "%s Warning: ACL \"warn\" statement skipped: " | |
4207 | "condition test deferred%s%s", host_and_ident(TRUE), | |
4208 | (*log_msgptr == NULL)? US"" : US": ", | |
4209 | (*log_msgptr == NULL)? US"" : *log_msgptr); | |
4210 | *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */ | |
4211 | break; | |
059ec3d9 PH |
4212 | |
4213 | default: | |
897024f1 JH |
4214 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d", |
4215 | acl->verb); | |
4216 | break; | |
059ec3d9 PH |
4217 | } |
4218 | ||
4219 | /* Pass to the next ACL item */ | |
4220 | ||
4221 | acl = acl->next; | |
4222 | } | |
4223 | ||
4224 | /* We have reached the end of the ACL. This is an implicit DENY. */ | |
4225 | ||
e1d04f48 | 4226 | HDEBUG(D_acl) debug_printf_indent("end of %s: implicit DENY\n", acl_name); |
059ec3d9 | 4227 | return FAIL; |
82c0c8ea JH |
4228 | |
4229 | badquit: | |
4c04137d | 4230 | *log_msgptr = string_sprintf("QUIT or not-QUIT toplevel ACL may not fail " |
82c0c8ea JH |
4231 | "('%s' verb used incorrectly)", verbs[acl->verb]); |
4232 | return ERROR; | |
059ec3d9 PH |
4233 | } |
4234 | ||
4235 | ||
333eea9c JH |
4236 | |
4237 | ||
4238 | /* Same args as acl_check_internal() above, but the string s is | |
4239 | the name of an ACL followed optionally by up to 9 space-separated arguments. | |
4240 | The name and args are separately expanded. Args go into $acl_arg globals. */ | |
f60d98e8 | 4241 | static int |
e1d04f48 | 4242 | acl_check_wargs(int where, address_item *addr, const uschar *s, |
333eea9c JH |
4243 | uschar **user_msgptr, uschar **log_msgptr) |
4244 | { | |
4245 | uschar * tmp; | |
bef3ea7f | 4246 | uschar * tmp_arg[9]; /* must match acl_arg[] */ |
ef21c07d JH |
4247 | uschar * sav_arg[9]; /* must match acl_arg[] */ |
4248 | int sav_narg; | |
333eea9c | 4249 | uschar * name; |
bef3ea7f | 4250 | int i; |
ef21c07d | 4251 | int ret; |
333eea9c JH |
4252 | |
4253 | if (!(tmp = string_dequote(&s)) || !(name = expand_string(tmp))) | |
4254 | goto bad; | |
4255 | ||
bef3ea7f | 4256 | for (i = 0; i < 9; i++) |
333eea9c JH |
4257 | { |
4258 | while (*s && isspace(*s)) s++; | |
4259 | if (!*s) break; | |
bef3ea7f | 4260 | if (!(tmp = string_dequote(&s)) || !(tmp_arg[i] = expand_string(tmp))) |
333eea9c JH |
4261 | { |
4262 | tmp = name; | |
4263 | goto bad; | |
4264 | } | |
4265 | } | |
ef21c07d JH |
4266 | |
4267 | sav_narg = acl_narg; | |
bef3ea7f | 4268 | acl_narg = i; |
ef21c07d JH |
4269 | for (i = 0; i < acl_narg; i++) |
4270 | { | |
4271 | sav_arg[i] = acl_arg[i]; | |
4272 | acl_arg[i] = tmp_arg[i]; | |
4273 | } | |
4274 | while (i < 9) | |
4275 | { | |
4276 | sav_arg[i] = acl_arg[i]; | |
4277 | acl_arg[i++] = NULL; | |
4278 | } | |
4279 | ||
e1d04f48 JH |
4280 | acl_level++; |
4281 | ret = acl_check_internal(where, addr, name, user_msgptr, log_msgptr); | |
4282 | acl_level--; | |
333eea9c | 4283 | |
ef21c07d JH |
4284 | acl_narg = sav_narg; |
4285 | for (i = 0; i < 9; i++) acl_arg[i] = sav_arg[i]; | |
4286 | return ret; | |
333eea9c JH |
4287 | |
4288 | bad: | |
8768d548 | 4289 | if (f.expand_string_forcedfail) return ERROR; |
333eea9c JH |
4290 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", |
4291 | tmp, expand_string_message); | |
8768d548 | 4292 | return f.search_find_defer ? DEFER : ERROR; |
333eea9c JH |
4293 | } |
4294 | ||
4295 | ||
4296 | ||
059ec3d9 PH |
4297 | /************************************************* |
4298 | * Check access using an ACL * | |
4299 | *************************************************/ | |
4300 | ||
faa05a93 JH |
4301 | /* Alternate interface for ACL, used by expansions */ |
4302 | int | |
05caaeaa | 4303 | acl_eval(int where, uschar *s, uschar **user_msgptr, uschar **log_msgptr) |
faa05a93 | 4304 | { |
faa05a93 JH |
4305 | address_item adb; |
4306 | address_item *addr = NULL; | |
e1d04f48 | 4307 | int rc; |
faa05a93 JH |
4308 | |
4309 | *user_msgptr = *log_msgptr = NULL; | |
4310 | sender_verified_failed = NULL; | |
4311 | ratelimiters_cmd = NULL; | |
4312 | log_reject_target = LOG_MAIN|LOG_REJECT; | |
4313 | ||
4314 | if (where == ACL_WHERE_RCPT) | |
4315 | { | |
4316 | adb = address_defaults; | |
4317 | addr = &adb; | |
05caaeaa JH |
4318 | addr->address = expand_string(US"$local_part@$domain"); |
4319 | addr->domain = deliver_domain; | |
4320 | addr->local_part = deliver_localpart; | |
4321 | addr->cc_local_part = deliver_localpart; | |
4322 | addr->lc_local_part = deliver_localpart; | |
faa05a93 JH |
4323 | } |
4324 | ||
e1d04f48 JH |
4325 | acl_level++; |
4326 | rc = acl_check_internal(where, addr, s, user_msgptr, log_msgptr); | |
4327 | acl_level--; | |
4328 | return rc; | |
faa05a93 JH |
4329 | } |
4330 | ||
4331 | ||
4332 | ||
059ec3d9 PH |
4333 | /* This is the external interface for ACL checks. It sets up an address and the |
4334 | expansions for $domain and $local_part when called after RCPT, then calls | |
4335 | acl_check_internal() to do the actual work. | |
4336 | ||
4337 | Arguments: | |
4338 | where ACL_WHERE_xxxx indicating where called from | |
64ffc24f | 4339 | recipient RCPT address for RCPT check, else NULL |
059ec3d9 PH |
4340 | s the input string; NULL is the same as an empty ACL => DENY |
4341 | user_msgptr where to put a user error (for SMTP response) | |
4342 | log_msgptr where to put a logging message (not for SMTP response) | |
4343 | ||
4344 | Returns: OK access is granted by an ACCEPT verb | |
4345 | DISCARD access is granted by a DISCARD verb | |
4346 | FAIL access is denied | |
4347 | FAIL_DROP access is denied; drop the connection | |
4348 | DEFER can't tell at the moment | |
4349 | ERROR disaster | |
4350 | */ | |
faa05a93 | 4351 | int acl_where = ACL_WHERE_UNKNOWN; |
059ec3d9 PH |
4352 | |
4353 | int | |
64ffc24f | 4354 | acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr, |
059ec3d9 PH |
4355 | uschar **log_msgptr) |
4356 | { | |
4357 | int rc; | |
4358 | address_item adb; | |
64ffc24f | 4359 | address_item *addr = NULL; |
059ec3d9 PH |
4360 | |
4361 | *user_msgptr = *log_msgptr = NULL; | |
4362 | sender_verified_failed = NULL; | |
fe0dab11 | 4363 | ratelimiters_cmd = NULL; |
6ea85e9a | 4364 | log_reject_target = LOG_MAIN|LOG_REJECT; |
059ec3d9 | 4365 | |
8ccd00b1 | 4366 | #ifndef DISABLE_PRDR |
4f6ae5c3 | 4367 | if (where==ACL_WHERE_RCPT || where==ACL_WHERE_VRFY || where==ACL_WHERE_PRDR) |
fd98a5c6 | 4368 | #else |
4f6ae5c3 | 4369 | if (where==ACL_WHERE_RCPT || where==ACL_WHERE_VRFY) |
fd98a5c6 | 4370 | #endif |
059ec3d9 PH |
4371 | { |
4372 | adb = address_defaults; | |
4373 | addr = &adb; | |
64ffc24f | 4374 | addr->address = recipient; |
059ec3d9 PH |
4375 | if (deliver_split_address(addr) == DEFER) |
4376 | { | |
4377 | *log_msgptr = US"defer in percent_hack_domains check"; | |
4378 | return DEFER; | |
4379 | } | |
8c5d388a | 4380 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
4381 | if ((addr->prop.utf8_msg = message_smtputf8)) |
4382 | { | |
4383 | addr->prop.utf8_downcvt = message_utf8_downconvert == 1; | |
4384 | addr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1; | |
4385 | } | |
9bfc60eb | 4386 | #endif |
059ec3d9 PH |
4387 | deliver_domain = addr->domain; |
4388 | deliver_localpart = addr->local_part; | |
4389 | } | |
059ec3d9 | 4390 | |
faa05a93 | 4391 | acl_where = where; |
e1d04f48 JH |
4392 | acl_level = 0; |
4393 | rc = acl_check_internal(where, addr, s, user_msgptr, log_msgptr); | |
4394 | acl_level = 0; | |
faa05a93 | 4395 | acl_where = ACL_WHERE_UNKNOWN; |
059ec3d9 | 4396 | |
817d9f57 JH |
4397 | /* Cutthrough - if requested, |
4398 | and WHERE_RCPT and not yet opened conn as result of recipient-verify, | |
4399 | and rcpt acl returned accept, | |
4400 | and first recipient (cancel on any subsequents) | |
e4bdf652 | 4401 | open one now and run it up to RCPT acceptance. |
f9334a28 JH |
4402 | A failed verify should cancel cutthrough request, |
4403 | and will pass the fail to the originator. | |
817d9f57 | 4404 | Initial implementation: dual-write to spool. |
e4bdf652 JH |
4405 | Assume the rxd datastream is now being copied byte-for-byte to an open cutthrough connection. |
4406 | ||
4407 | Cease cutthrough copy on rxd final dot; do not send one. | |
4408 | ||
4409 | On a data acl, if not accept and a cutthrough conn is open, hard-close it (no SMTP niceness). | |
4410 | ||
4411 | On data acl accept, terminate the dataphase on an open cutthrough conn. If accepted or | |
4412 | perm-rejected, reflect that to the original sender - and dump the spooled copy. | |
4413 | If temp-reject, close the conn (and keep the spooled copy). | |
4414 | If conn-failure, no action (and keep the spooled copy). | |
e4bdf652 JH |
4415 | */ |
4416 | switch (where) | |
ff5929e3 JH |
4417 | { |
4418 | case ACL_WHERE_RCPT: | |
8ccd00b1 | 4419 | #ifndef DISABLE_PRDR |
ff5929e3 | 4420 | case ACL_WHERE_PRDR: |
fd98a5c6 | 4421 | #endif |
57cc2785 | 4422 | |
8768d548 | 4423 | if (f.host_checking_callout) /* -bhc mode */ |
57cc2785 | 4424 | cancel_cutthrough_connection(TRUE, US"host-checking mode"); |
ff5929e3 JH |
4425 | |
4426 | else if ( rc == OK | |
4427 | && cutthrough.delivery | |
4428 | && rcpt_count > cutthrough.nrcpt | |
ff5929e3 | 4429 | ) |
06fdb9f7 JH |
4430 | { |
4431 | if ((rc = open_cutthrough_connection(addr)) == DEFER) | |
4432 | if (cutthrough.defer_pass) | |
4433 | { | |
4434 | uschar * s = addr->message; | |
4435 | /* Horrid kludge to recover target's SMTP message */ | |
4436 | while (*s) s++; | |
4437 | do --s; while (!isdigit(*s)); | |
4438 | if (*--s && isdigit(*s) && *--s && isdigit(*s)) *user_msgptr = s; | |
8768d548 | 4439 | f.acl_temp_details = TRUE; |
06fdb9f7 JH |
4440 | } |
4441 | else | |
4442 | { | |
4443 | HDEBUG(D_acl) debug_printf_indent("cutthrough defer; will spool\n"); | |
4444 | rc = OK; | |
4445 | } | |
4446 | } | |
4447 | else HDEBUG(D_acl) if (cutthrough.delivery) | |
4448 | if (rcpt_count <= cutthrough.nrcpt) | |
4449 | debug_printf_indent("ignore cutthrough request; nonfirst message\n"); | |
4450 | else if (rc != OK) | |
4451 | debug_printf_indent("ignore cutthrough request; ACL did not accept\n"); | |
ff5929e3 | 4452 | break; |
e4bdf652 | 4453 | |
ff5929e3 JH |
4454 | case ACL_WHERE_PREDATA: |
4455 | if (rc == OK) | |
4456 | cutthrough_predata(); | |
4457 | else | |
57cc2785 | 4458 | cancel_cutthrough_connection(TRUE, US"predata acl not ok"); |
ff5929e3 | 4459 | break; |
e4bdf652 | 4460 | |
ff5929e3 JH |
4461 | case ACL_WHERE_QUIT: |
4462 | case ACL_WHERE_NOTQUIT: | |
57cc2785 JH |
4463 | /* Drop cutthrough conns, and drop heldopen verify conns if |
4464 | the previous was not DATA */ | |
4465 | { | |
4466 | uschar prev = smtp_connection_had[smtp_ch_index-2]; | |
4467 | BOOL dropverify = !(prev == SCH_DATA || prev == SCH_BDAT); | |
4468 | ||
4469 | cancel_cutthrough_connection(dropverify, US"quit or conndrop"); | |
ff5929e3 | 4470 | break; |
57cc2785 | 4471 | } |
e4bdf652 | 4472 | |
ff5929e3 JH |
4473 | default: |
4474 | break; | |
4475 | } | |
e4bdf652 | 4476 | |
64ffc24f | 4477 | deliver_domain = deliver_localpart = deliver_address_data = |
c679ee08 | 4478 | deliver_domain_data = sender_address_data = NULL; |
059ec3d9 PH |
4479 | |
4480 | /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA | |
4481 | ACL, which is really in the middle of an SMTP command. */ | |
4482 | ||
4483 | if (rc == DISCARD) | |
4484 | { | |
4485 | if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA) | |
4486 | { | |
4487 | log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s " | |
4488 | "ACL", acl_wherenames[where]); | |
4489 | return ERROR; | |
4490 | } | |
4491 | return DISCARD; | |
4492 | } | |
4493 | ||
4494 | /* A DROP response is not permitted from MAILAUTH */ | |
4495 | ||
4496 | if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH) | |
4497 | { | |
4498 | log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s " | |
4499 | "ACL", acl_wherenames[where]); | |
4500 | return ERROR; | |
4501 | } | |
4502 | ||
4e88a19f PH |
4503 | /* Before giving a response, take a look at the length of any user message, and |
4504 | split it up into multiple lines if possible. */ | |
059ec3d9 | 4505 | |
e28326d8 PH |
4506 | *user_msgptr = string_split_message(*user_msgptr); |
4507 | if (fake_response != OK) | |
4508 | fake_response_text = string_split_message(fake_response_text); | |
059ec3d9 PH |
4509 | |
4510 | return rc; | |
4511 | } | |
4512 | ||
38a0a95f | 4513 | |
38a0a95f PH |
4514 | /************************************************* |
4515 | * Create ACL variable * | |
4516 | *************************************************/ | |
4517 | ||
4518 | /* Create an ACL variable or reuse an existing one. ACL variables are in a | |
4519 | binary tree (see tree.c) with acl_var_c and acl_var_m as root nodes. | |
4520 | ||
4521 | Argument: | |
4522 | name pointer to the variable's name, starting with c or m | |
4523 | ||
4524 | Returns the pointer to variable's tree node | |
4525 | */ | |
4526 | ||
4527 | tree_node * | |
2c0f3ea1 | 4528 | acl_var_create(uschar * name) |
38a0a95f | 4529 | { |
2c0f3ea1 JH |
4530 | tree_node * node, ** root = name[0] == 'c' ? &acl_var_c : &acl_var_m; |
4531 | if (!(node = tree_search(*root, name))) | |
38a0a95f | 4532 | { |
f3ebb786 | 4533 | node = store_get(sizeof(tree_node) + Ustrlen(name), is_tainted(name)); |
38a0a95f PH |
4534 | Ustrcpy(node->name, name); |
4535 | (void)tree_insertnode(root, node); | |
4536 | } | |
4537 | node->data.ptr = NULL; | |
4538 | return node; | |
4539 | } | |
4540 | ||
4541 | ||
4542 | ||
4543 | /************************************************* | |
4544 | * Write an ACL variable in spool format * | |
4545 | *************************************************/ | |
4546 | ||
4547 | /* This function is used as a callback for tree_walk when writing variables to | |
4548 | the spool file. To retain spool file compatibility, what is written is -aclc or | |
4549 | -aclm followed by the rest of the name and the data length, space separated, | |
4550 | then the value itself, starting on a new line, and terminated by an additional | |
4551 | newline. When we had only numbered ACL variables, the first line might look | |
4552 | like this: "-aclc 5 20". Now it might be "-aclc foo 20" for the variable called | |
4553 | acl_cfoo. | |
4554 | ||
4555 | Arguments: | |
4556 | name of the variable | |
4557 | value of the variable | |
4558 | ctx FILE pointer (as a void pointer) | |
4559 | ||
4560 | Returns: nothing | |
4561 | */ | |
4562 | ||
4563 | void | |
4564 | acl_var_write(uschar *name, uschar *value, void *ctx) | |
4565 | { | |
4566 | FILE *f = (FILE *)ctx; | |
f3ebb786 | 4567 | if (is_tainted(value)) putc('-', f); |
38a0a95f PH |
4568 | fprintf(f, "-acl%c %s %d\n%s\n", name[0], name+1, Ustrlen(value), value); |
4569 | } | |
4570 | ||
9171d434 JH |
4571 | /* vi: aw ai sw=2 |
4572 | */ | |
059ec3d9 | 4573 | /* End of acl.c */ |