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 TL |
72 | #endif |
73 | #ifdef EXPERIMENTAL_DMARC | |
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 TL |
194 | #endif |
195 | #ifdef EXPERIMENTAL_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 |
3c8b3577 | 349 | #ifdef EXPERIMENTAL_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 | |
4840604e | 420 | #ifdef EXPERIMENTAL_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 | }, |
f2ed27cf | 513 | [CONTROL_SUBMISSION] = |
d7bed771 | 514 | { US"submission", TRUE, |
f2ed27cf | 515 | (unsigned) |
e3a69b62 | 516 | ~(ACL_BIT_MAIL | ACL_BIT_RCPT | ACL_BIT_PREDATA) |
d7bed771 | 517 | }, |
f2ed27cf | 518 | [CONTROL_SUPPRESS_LOCAL_FIXUPS] = |
d7bed771 JH |
519 | { US"suppress_local_fixups", FALSE, |
520 | (unsigned) | |
e3a69b62 JH |
521 | ~(ACL_BIT_MAIL | ACL_BIT_RCPT | ACL_BIT_PREDATA | |
522 | ACL_BIT_NOTSMTP_START) | |
d7bed771 | 523 | }, |
8c5d388a | 524 | #ifdef SUPPORT_I18N |
f2ed27cf | 525 | [CONTROL_UTF8_DOWNCONVERT] = |
6741531c JH |
526 | { US"utf8_downconvert", TRUE, (unsigned) ~(ACL_BIT_RCPT | ACL_BIT_VRFY) |
527 | } | |
3c8b3577 | 528 | #endif |
d7bed771 | 529 | }; |
059ec3d9 | 530 | |
e5a9dba6 PH |
531 | /* Support data structures for Client SMTP Authorization. acl_verify_csa() |
532 | caches its result in a tree to avoid repeated DNS queries. The result is an | |
533 | integer code which is used as an index into the following tables of | |
534 | explanatory strings and verification return codes. */ | |
535 | ||
536 | static tree_node *csa_cache = NULL; | |
537 | ||
538 | enum { CSA_UNKNOWN, CSA_OK, CSA_DEFER_SRV, CSA_DEFER_ADDR, | |
539 | CSA_FAIL_EXPLICIT, CSA_FAIL_DOMAIN, CSA_FAIL_NOADDR, CSA_FAIL_MISMATCH }; | |
540 | ||
541 | /* The acl_verify_csa() return code is translated into an acl_verify() return | |
542 | code using the following table. It is OK unless the client is definitely not | |
543 | authorized. This is because CSA is supposed to be optional for sending sites, | |
544 | so recipients should not be too strict about checking it - especially because | |
545 | DNS problems are quite likely to occur. It's possible to use $csa_status in | |
546 | further ACL conditions to distinguish ok, unknown, and defer if required, but | |
547 | the aim is to make the usual configuration simple. */ | |
548 | ||
549 | static int csa_return_code[] = { | |
f2ed27cf JH |
550 | [CSA_UNKNOWN] = OK, |
551 | [CSA_OK] = OK, | |
552 | [CSA_DEFER_SRV] = OK, | |
553 | [CSA_DEFER_ADDR] = OK, | |
554 | [CSA_FAIL_EXPLICIT] = FAIL, | |
555 | [CSA_FAIL_DOMAIN] = FAIL, | |
556 | [CSA_FAIL_NOADDR] = FAIL, | |
557 | [CSA_FAIL_MISMATCH] = FAIL | |
e5a9dba6 PH |
558 | }; |
559 | ||
560 | static uschar *csa_status_string[] = { | |
f2ed27cf JH |
561 | [CSA_UNKNOWN] = US"unknown", |
562 | [CSA_OK] = US"ok", | |
563 | [CSA_DEFER_SRV] = US"defer", | |
564 | [CSA_DEFER_ADDR] = US"defer", | |
565 | [CSA_FAIL_EXPLICIT] = US"fail", | |
566 | [CSA_FAIL_DOMAIN] = US"fail", | |
567 | [CSA_FAIL_NOADDR] = US"fail", | |
568 | [CSA_FAIL_MISMATCH] = US"fail" | |
e5a9dba6 PH |
569 | }; |
570 | ||
571 | static uschar *csa_reason_string[] = { | |
f2ed27cf JH |
572 | [CSA_UNKNOWN] = US"unknown", |
573 | [CSA_OK] = US"ok", | |
574 | [CSA_DEFER_SRV] = US"deferred (SRV lookup failed)", | |
575 | [CSA_DEFER_ADDR] = US"deferred (target address lookup failed)", | |
576 | [CSA_FAIL_EXPLICIT] = US"failed (explicit authorization required)", | |
577 | [CSA_FAIL_DOMAIN] = US"failed (host name not authorized)", | |
578 | [CSA_FAIL_NOADDR] = US"failed (no authorized addresses)", | |
579 | [CSA_FAIL_MISMATCH] = US"failed (client address mismatch)" | |
e5a9dba6 PH |
580 | }; |
581 | ||
c99ce5c9 TF |
582 | /* Options for the ratelimit condition. Note that there are two variants of |
583 | the per_rcpt option, depending on the ACL that is used to measure the rate. | |
584 | However any ACL must be able to look up per_rcpt rates in /noupdate mode, | |
585 | so the two variants must have the same internal representation as well as | |
586 | the same configuration string. */ | |
587 | ||
588 | enum { | |
589 | RATE_PER_WHAT, RATE_PER_CLASH, RATE_PER_ADDR, RATE_PER_BYTE, RATE_PER_CMD, | |
590 | RATE_PER_CONN, RATE_PER_MAIL, RATE_PER_RCPT, RATE_PER_ALLRCPTS | |
591 | }; | |
592 | ||
593 | #define RATE_SET(var,new) \ | |
594 | (((var) == RATE_PER_WHAT) ? ((var) = RATE_##new) : ((var) = RATE_PER_CLASH)) | |
595 | ||
596 | static uschar *ratelimit_option_string[] = { | |
f2ed27cf JH |
597 | [RATE_PER_WHAT] = US"?", |
598 | [RATE_PER_CLASH] = US"!", | |
599 | [RATE_PER_ADDR] = US"per_addr", | |
600 | [RATE_PER_BYTE] = US"per_byte", | |
601 | [RATE_PER_CMD] = US"per_cmd", | |
602 | [RATE_PER_CONN] = US"per_conn", | |
603 | [RATE_PER_MAIL] = US"per_mail", | |
604 | [RATE_PER_RCPT] = US"per_rcpt", | |
605 | [RATE_PER_ALLRCPTS] = US"per_rcpt" | |
c99ce5c9 TF |
606 | }; |
607 | ||
059ec3d9 PH |
608 | /* Enable recursion between acl_check_internal() and acl_check_condition() */ |
609 | ||
e1d04f48 | 610 | static int acl_check_wargs(int, address_item *, const uschar *, uschar **, |
f60d98e8 | 611 | uschar **); |
059ec3d9 PH |
612 | |
613 | ||
d7bed771 JH |
614 | /************************************************* |
615 | * Find control in list * | |
616 | *************************************************/ | |
617 | ||
618 | /* The lists are always in order, so binary chop can be used. | |
619 | ||
620 | Arguments: | |
621 | name the control name to search for | |
622 | ol the first entry in the control list | |
623 | last one more than the offset of the last entry in the control list | |
624 | ||
625 | Returns: index of a control entry, or -1 if not found | |
626 | */ | |
627 | ||
628 | static int | |
629 | find_control(const uschar * name, control_def * ol, int last) | |
630 | { | |
631 | int first = 0; | |
632 | while (last > first) | |
633 | { | |
634 | int middle = (first + last)/2; | |
635 | uschar * s = ol[middle].name; | |
636 | int c = Ustrncmp(name, s, Ustrlen(s)); | |
637 | if (c == 0) return middle; | |
638 | else if (c > 0) first = middle + 1; | |
639 | else last = middle; | |
640 | } | |
641 | return -1; | |
642 | } | |
643 | ||
644 | ||
645 | ||
2d009132 JH |
646 | /************************************************* |
647 | * Pick out condition from list * | |
648 | *************************************************/ | |
649 | ||
650 | /* Use a binary chop method | |
651 | ||
652 | Arguments: | |
653 | name name to find | |
654 | list list of conditions | |
655 | end size of list | |
656 | ||
657 | Returns: offset in list, or -1 if not found | |
658 | */ | |
659 | ||
660 | static int | |
661 | acl_checkcondition(uschar * name, condition_def * list, int end) | |
662 | { | |
663 | int start = 0; | |
664 | while (start < end) | |
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 | { | |
693 | int start = 0; | |
694 | ||
695 | while (start < end) | |
696 | { | |
697 | int mid = (start + end)/2; | |
698 | int c = Ustrcmp(name, list[mid]); | |
699 | if (c == 0) return mid; | |
700 | if (c < 0) end = mid; else start = mid + 1; | |
701 | } | |
702 | ||
703 | return -1; | |
704 | } | |
705 | ||
706 | ||
707 | /************************************************* | |
708 | * Read and parse one ACL * | |
709 | *************************************************/ | |
710 | ||
711 | /* This function is called both from readconf in order to parse the ACLs in the | |
712 | configuration file, and also when an ACL is encountered dynamically (e.g. as | |
713 | the result of an expansion). It is given a function to call in order to | |
714 | retrieve the lines of the ACL. This function handles skipping comments and | |
715 | blank lines (where relevant). | |
716 | ||
717 | Arguments: | |
718 | func function to get next line of ACL | |
719 | error where to put an error message | |
720 | ||
721 | Returns: pointer to ACL, or NULL | |
722 | NULL can be legal (empty ACL); in this case error will be NULL | |
723 | */ | |
724 | ||
725 | acl_block * | |
726 | acl_read(uschar *(*func)(void), uschar **error) | |
727 | { | |
728 | acl_block *yield = NULL; | |
729 | acl_block **lastp = &yield; | |
730 | acl_block *this = NULL; | |
731 | acl_condition_block *cond; | |
732 | acl_condition_block **condp = NULL; | |
733 | uschar *s; | |
734 | ||
735 | *error = NULL; | |
736 | ||
737 | while ((s = (*func)()) != NULL) | |
738 | { | |
739 | int v, c; | |
740 | BOOL negated = FALSE; | |
741 | uschar *saveline = s; | |
742 | uschar name[64]; | |
743 | ||
744 | /* Conditions (but not verbs) are allowed to be negated by an initial | |
745 | exclamation mark. */ | |
746 | ||
747 | while (isspace(*s)) s++; | |
748 | if (*s == '!') | |
749 | { | |
750 | negated = TRUE; | |
751 | s++; | |
752 | } | |
753 | ||
cf00dad6 PH |
754 | /* Read the name of a verb or a condition, or the start of a new ACL, which |
755 | can be started by a name, or by a macro definition. */ | |
059ec3d9 PH |
756 | |
757 | s = readconf_readname(name, sizeof(name), s); | |
b8dc3e4a | 758 | if (*s == ':' || (isupper(name[0]) && *s == '=')) return yield; |
059ec3d9 PH |
759 | |
760 | /* If a verb is unrecognized, it may be another condition or modifier that | |
761 | continues the previous verb. */ | |
762 | ||
2d009132 | 763 | if ((v = acl_checkname(name, verbs, nelem(verbs))) < 0) |
059ec3d9 PH |
764 | { |
765 | if (this == NULL) | |
766 | { | |
4e167a8c PH |
767 | *error = string_sprintf("unknown ACL verb \"%s\" in \"%s\"", name, |
768 | saveline); | |
059ec3d9 PH |
769 | return NULL; |
770 | } | |
771 | } | |
772 | ||
773 | /* New verb */ | |
774 | ||
775 | else | |
776 | { | |
777 | if (negated) | |
778 | { | |
779 | *error = string_sprintf("malformed ACL line \"%s\"", saveline); | |
780 | return NULL; | |
781 | } | |
782 | this = store_get(sizeof(acl_block)); | |
783 | *lastp = this; | |
784 | lastp = &(this->next); | |
785 | this->next = NULL; | |
786 | this->verb = v; | |
787 | this->condition = NULL; | |
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 | ||
827 | cond = store_get(sizeof(acl_condition_block)); | |
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 PH |
1024 | { |
1025 | header_line *h = store_get(sizeof(header_line)); | |
55414b25 | 1026 | h->text = hdr; |
71fafd95 PH |
1027 | h->next = NULL; |
1028 | h->type = newtype; | |
1029 | h->slen = hlen; | |
1030 | *hptr = h; | |
617d3932 | 1031 | hptr = &h->next; |
71fafd95 | 1032 | } |
71fafd95 PH |
1033 | } |
1034 | } | |
1035 | ||
1036 | ||
1037 | ||
362145b5 JH |
1038 | /************************************************* |
1039 | * List the added header lines * | |
1040 | *************************************************/ | |
1041 | uschar * | |
1042 | fn_hdrs_added(void) | |
1043 | { | |
acec9514 | 1044 | gstring * g = NULL; |
362145b5 JH |
1045 | header_line * h = acl_added_headers; |
1046 | uschar * s; | |
1047 | uschar * cp; | |
362145b5 JH |
1048 | |
1049 | if (!h) return NULL; | |
1050 | ||
1051 | do | |
1052 | { | |
1053 | s = h->text; | |
1054 | while ((cp = Ustrchr(s, '\n')) != NULL) | |
1055 | { | |
1056 | if (cp[1] == '\0') break; | |
1057 | ||
1058 | /* contains embedded newline; needs doubling */ | |
acec9514 JH |
1059 | g = string_catn(g, s, cp-s+1); |
1060 | g = string_catn(g, US"\n", 1); | |
362145b5 JH |
1061 | s = cp+1; |
1062 | } | |
1063 | /* last bit of header */ | |
1064 | ||
acec9514 JH |
1065 | /*XXX could we use add_listele? */ |
1066 | g = string_catn(g, s, cp-s+1); /* newline-sep list */ | |
362145b5 | 1067 | } |
6d9cfc47 | 1068 | while((h = h->next)); |
362145b5 | 1069 | |
acec9514 JH |
1070 | g->s[g->ptr - 1] = '\0'; /* overwrite last newline */ |
1071 | return g->s; | |
362145b5 JH |
1072 | } |
1073 | ||
1074 | ||
e7568d51 TL |
1075 | /************************************************* |
1076 | * Set up removed header line(s) * | |
1077 | *************************************************/ | |
1078 | ||
1079 | /* This function is called by the remove_header modifier. The argument is | |
1080 | treated as a sequence of header names which are added to a colon separated | |
1081 | list, provided there isn't an identical one already there. | |
1082 | ||
1083 | Argument: string of header names | |
1084 | Returns: nothing | |
1085 | */ | |
1086 | ||
1087 | static void | |
55414b25 | 1088 | setup_remove_header(const uschar *hnames) |
e7568d51 TL |
1089 | { |
1090 | if (*hnames != 0) | |
55414b25 JH |
1091 | acl_removed_headers = acl_removed_headers |
1092 | ? string_sprintf("%s : %s", acl_removed_headers, hnames) | |
1093 | : string_copy(hnames); | |
e7568d51 TL |
1094 | } |
1095 | ||
1096 | ||
71fafd95 | 1097 | |
059ec3d9 PH |
1098 | /************************************************* |
1099 | * Handle warnings * | |
1100 | *************************************************/ | |
1101 | ||
1102 | /* This function is called when a WARN verb's conditions are true. It adds to | |
1103 | the message's headers, and/or writes information to the log. In each case, this | |
1104 | only happens once (per message for headers, per connection for log). | |
1105 | ||
71fafd95 PH |
1106 | ** NOTE: The header adding action using the "message" setting is historic, and |
1107 | its use is now deprecated. The new add_header modifier should be used instead. | |
1108 | ||
059ec3d9 PH |
1109 | Arguments: |
1110 | where ACL_WHERE_xxxx indicating which ACL this is | |
1111 | user_message message for adding to headers | |
1112 | log_message message for logging, if different | |
1113 | ||
1114 | Returns: nothing | |
1115 | */ | |
1116 | ||
1117 | static void | |
1118 | acl_warn(int where, uschar *user_message, uschar *log_message) | |
1119 | { | |
059ec3d9 PH |
1120 | if (log_message != NULL && log_message != user_message) |
1121 | { | |
1122 | uschar *text; | |
1123 | string_item *logged; | |
1124 | ||
1125 | text = string_sprintf("%s Warning: %s", host_and_ident(TRUE), | |
1126 | string_printing(log_message)); | |
1127 | ||
1128 | /* If a sender verification has failed, and the log message is "sender verify | |
1129 | failed", add the failure message. */ | |
1130 | ||
1131 | if (sender_verified_failed != NULL && | |
1132 | sender_verified_failed->message != NULL && | |
1133 | strcmpic(log_message, US"sender verify failed") == 0) | |
1134 | text = string_sprintf("%s: %s", text, sender_verified_failed->message); | |
1135 | ||
9c7a242c PH |
1136 | /* Search previously logged warnings. They are kept in malloc |
1137 | store so they can be freed at the start of a new message. */ | |
059ec3d9 PH |
1138 | |
1139 | for (logged = acl_warn_logged; logged != NULL; logged = logged->next) | |
1140 | if (Ustrcmp(logged->text, text) == 0) break; | |
1141 | ||
1142 | if (logged == NULL) | |
1143 | { | |
1144 | int length = Ustrlen(text) + 1; | |
1145 | log_write(0, LOG_MAIN, "%s", text); | |
1146 | logged = store_malloc(sizeof(string_item) + length); | |
5903c6ff | 1147 | logged->text = US logged + sizeof(string_item); |
059ec3d9 PH |
1148 | memcpy(logged->text, text, length); |
1149 | logged->next = acl_warn_logged; | |
1150 | acl_warn_logged = logged; | |
1151 | } | |
1152 | } | |
1153 | ||
1154 | /* If there's no user message, we are done. */ | |
1155 | ||
1156 | if (user_message == NULL) return; | |
1157 | ||
1158 | /* If this isn't a message ACL, we can't do anything with a user message. | |
1159 | Log an error. */ | |
1160 | ||
1161 | if (where > ACL_WHERE_NOTSMTP) | |
1162 | { | |
1163 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting " | |
1164 | "found in a non-message (%s) ACL: cannot specify header lines here: " | |
1165 | "message ignored", acl_wherenames[where]); | |
1166 | return; | |
1167 | } | |
1168 | ||
71fafd95 PH |
1169 | /* The code for setting up header lines is now abstracted into a separate |
1170 | function so that it can be used for the add_header modifier as well. */ | |
059ec3d9 | 1171 | |
71fafd95 | 1172 | setup_header(user_message); |
059ec3d9 PH |
1173 | } |
1174 | ||
1175 | ||
1176 | ||
1177 | /************************************************* | |
1178 | * Verify and check reverse DNS * | |
1179 | *************************************************/ | |
1180 | ||
1181 | /* Called from acl_verify() below. We look up the host name(s) of the client IP | |
1182 | address if this has not yet been done. The host_name_lookup() function checks | |
1183 | that one of these names resolves to an address list that contains the client IP | |
1184 | address, so we don't actually have to do the check here. | |
1185 | ||
1186 | Arguments: | |
1187 | user_msgptr pointer for user message | |
1188 | log_msgptr pointer for log message | |
1189 | ||
1190 | Returns: OK verification condition succeeded | |
1191 | FAIL verification failed | |
1192 | DEFER there was a problem verifying | |
1193 | */ | |
1194 | ||
1195 | static int | |
1196 | acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr) | |
1197 | { | |
1198 | int rc; | |
1199 | ||
1200 | user_msgptr = user_msgptr; /* stop compiler warning */ | |
1201 | ||
1202 | /* Previous success */ | |
1203 | ||
1204 | if (sender_host_name != NULL) return OK; | |
1205 | ||
1206 | /* Previous failure */ | |
1207 | ||
1208 | if (host_lookup_failed) | |
1209 | { | |
1210 | *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg); | |
1211 | return FAIL; | |
1212 | } | |
1213 | ||
1214 | /* Need to do a lookup */ | |
1215 | ||
1216 | HDEBUG(D_acl) | |
e1d04f48 | 1217 | debug_printf_indent("looking up host name to force name/address consistency check\n"); |
059ec3d9 PH |
1218 | |
1219 | if ((rc = host_name_lookup()) != OK) | |
1220 | { | |
1221 | *log_msgptr = (rc == DEFER)? | |
1222 | US"host lookup deferred for reverse lookup check" | |
1223 | : | |
1224 | string_sprintf("host lookup failed for reverse lookup check%s", | |
1225 | host_lookup_msg); | |
1226 | return rc; /* DEFER or FAIL */ | |
1227 | } | |
1228 | ||
1229 | host_build_sender_fullhost(); | |
1230 | return OK; | |
1231 | } | |
1232 | ||
1233 | ||
1234 | ||
e5a9dba6 PH |
1235 | /************************************************* |
1236 | * Check client IP address matches CSA target * | |
1237 | *************************************************/ | |
1238 | ||
1239 | /* Called from acl_verify_csa() below. This routine scans a section of a DNS | |
1240 | response for address records belonging to the CSA target hostname. The section | |
1241 | is specified by the reset argument, either RESET_ADDITIONAL or RESET_ANSWERS. | |
1242 | If one of the addresses matches the client's IP address, then the client is | |
1243 | authorized by CSA. If there are target IP addresses but none of them match | |
1244 | then the client is using an unauthorized IP address. If there are no target IP | |
1245 | addresses then the client cannot be using an authorized IP address. (This is | |
1246 | an odd configuration - why didn't the SRV record have a weight of 1 instead?) | |
1247 | ||
1248 | Arguments: | |
1249 | dnsa the DNS answer block | |
1250 | dnss a DNS scan block for us to use | |
4c04137d | 1251 | reset option specifying what portion to scan, as described above |
e5a9dba6 PH |
1252 | target the target hostname to use for matching RR names |
1253 | ||
1254 | Returns: CSA_OK successfully authorized | |
1255 | CSA_FAIL_MISMATCH addresses found but none matched | |
1256 | CSA_FAIL_NOADDR no target addresses found | |
1257 | */ | |
1258 | ||
1259 | static int | |
1260 | acl_verify_csa_address(dns_answer *dnsa, dns_scan *dnss, int reset, | |
1261 | uschar *target) | |
1262 | { | |
1263 | dns_record *rr; | |
1264 | dns_address *da; | |
1265 | ||
1266 | BOOL target_found = FALSE; | |
1267 | ||
1268 | for (rr = dns_next_rr(dnsa, dnss, reset); | |
1269 | rr != NULL; | |
1270 | rr = dns_next_rr(dnsa, dnss, RESET_NEXT)) | |
1271 | { | |
1272 | /* Check this is an address RR for the target hostname. */ | |
1273 | ||
1274 | if (rr->type != T_A | |
1275 | #if HAVE_IPV6 | |
1276 | && rr->type != T_AAAA | |
e5a9dba6 PH |
1277 | #endif |
1278 | ) continue; | |
1279 | ||
1280 | if (strcmpic(target, rr->name) != 0) continue; | |
1281 | ||
1282 | target_found = TRUE; | |
1283 | ||
1284 | /* Turn the target address RR into a list of textual IP addresses and scan | |
1285 | the list. There may be more than one if it is an A6 RR. */ | |
1286 | ||
1287 | for (da = dns_address_from_rr(dnsa, rr); da != NULL; da = da->next) | |
1288 | { | |
1289 | /* If the client IP address matches the target IP address, it's good! */ | |
1290 | ||
e1d04f48 | 1291 | DEBUG(D_acl) debug_printf_indent("CSA target address is %s\n", da->address); |
e5a9dba6 PH |
1292 | |
1293 | if (strcmpic(sender_host_address, da->address) == 0) return CSA_OK; | |
1294 | } | |
1295 | } | |
1296 | ||
1297 | /* If we found some target addresses but none of them matched, the client is | |
1298 | using an unauthorized IP address, otherwise the target has no authorized IP | |
1299 | addresses. */ | |
1300 | ||
1301 | if (target_found) return CSA_FAIL_MISMATCH; | |
1302 | else return CSA_FAIL_NOADDR; | |
1303 | } | |
1304 | ||
1305 | ||
1306 | ||
1307 | /************************************************* | |
1308 | * Verify Client SMTP Authorization * | |
1309 | *************************************************/ | |
1310 | ||
1311 | /* Called from acl_verify() below. This routine calls dns_lookup_special() | |
1312 | to find the CSA SRV record corresponding to the domain argument, or | |
1313 | $sender_helo_name if no argument is provided. It then checks that the | |
1314 | client is authorized, and that its IP address corresponds to the SRV | |
1315 | target's address by calling acl_verify_csa_address() above. The address | |
1316 | should have been returned in the DNS response's ADDITIONAL section, but if | |
1317 | not we perform another DNS lookup to get it. | |
1318 | ||
1319 | Arguments: | |
1320 | domain pointer to optional parameter following verify = csa | |
1321 | ||
1322 | Returns: CSA_UNKNOWN no valid CSA record found | |
1323 | CSA_OK successfully authorized | |
1324 | CSA_FAIL_* client is definitely not authorized | |
1325 | CSA_DEFER_* there was a DNS problem | |
1326 | */ | |
1327 | ||
1328 | static int | |
55414b25 | 1329 | acl_verify_csa(const uschar *domain) |
e5a9dba6 PH |
1330 | { |
1331 | tree_node *t; | |
55414b25 | 1332 | const uschar *found; |
e5a9dba6 PH |
1333 | int priority, weight, port; |
1334 | dns_answer dnsa; | |
1335 | dns_scan dnss; | |
1336 | dns_record *rr; | |
1337 | int rc, type; | |
1338 | uschar target[256]; | |
1339 | ||
1340 | /* Work out the domain we are using for the CSA lookup. The default is the | |
1341 | client's HELO domain. If the client has not said HELO, use its IP address | |
1342 | instead. If it's a local client (exim -bs), CSA isn't applicable. */ | |
1343 | ||
1344 | while (isspace(*domain) && *domain != '\0') ++domain; | |
1345 | if (*domain == '\0') domain = sender_helo_name; | |
1346 | if (domain == NULL) domain = sender_host_address; | |
1347 | if (sender_host_address == NULL) return CSA_UNKNOWN; | |
1348 | ||
1349 | /* If we have an address literal, strip off the framing ready for turning it | |
1350 | into a domain. The framing consists of matched square brackets possibly | |
1351 | containing a keyword and a colon before the actual IP address. */ | |
1352 | ||
1353 | if (domain[0] == '[') | |
1354 | { | |
55414b25 | 1355 | const uschar *start = Ustrchr(domain, ':'); |
e5a9dba6 PH |
1356 | if (start == NULL) start = domain; |
1357 | domain = string_copyn(start + 1, Ustrlen(start) - 2); | |
1358 | } | |
1359 | ||
1360 | /* Turn domains that look like bare IP addresses into domains in the reverse | |
1361 | DNS. This code also deals with address literals and $sender_host_address. It's | |
1362 | not quite kosher to treat bare domains such as EHLO 192.0.2.57 the same as | |
1363 | address literals, but it's probably the most friendly thing to do. This is an | |
1364 | extension to CSA, so we allow it to be turned off for proper conformance. */ | |
1365 | ||
7e66e54d | 1366 | if (string_is_ip_address(domain, NULL) != 0) |
e5a9dba6 PH |
1367 | { |
1368 | if (!dns_csa_use_reverse) return CSA_UNKNOWN; | |
1369 | dns_build_reverse(domain, target); | |
1370 | domain = target; | |
1371 | } | |
1372 | ||
1373 | /* Find out if we've already done the CSA check for this domain. If we have, | |
1374 | return the same result again. Otherwise build a new cached result structure | |
1375 | for this domain. The name is filled in now, and the value is filled in when | |
1376 | we return from this function. */ | |
1377 | ||
1378 | t = tree_search(csa_cache, domain); | |
1379 | if (t != NULL) return t->data.val; | |
1380 | ||
1381 | t = store_get_perm(sizeof(tree_node) + Ustrlen(domain)); | |
1382 | Ustrcpy(t->name, domain); | |
1383 | (void)tree_insertnode(&csa_cache, t); | |
1384 | ||
1385 | /* Now we are ready to do the actual DNS lookup(s). */ | |
1386 | ||
28e6ef29 | 1387 | found = domain; |
e5a9dba6 PH |
1388 | switch (dns_special_lookup(&dnsa, domain, T_CSA, &found)) |
1389 | { | |
1390 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1391 | ||
1392 | default: | |
1393 | return t->data.val = CSA_DEFER_SRV; | |
1394 | ||
1395 | /* If we found nothing, the client's authorization is unknown. */ | |
1396 | ||
1397 | case DNS_NOMATCH: | |
1398 | case DNS_NODATA: | |
1399 | return t->data.val = CSA_UNKNOWN; | |
1400 | ||
1401 | /* We got something! Go on to look at the reply in more detail. */ | |
1402 | ||
1403 | case DNS_SUCCEED: | |
1404 | break; | |
1405 | } | |
1406 | ||
1407 | /* Scan the reply for well-formed CSA SRV records. */ | |
1408 | ||
1409 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
dd708fd7 JH |
1410 | rr; |
1411 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) if (rr->type == T_SRV) | |
e5a9dba6 | 1412 | { |
dd708fd7 | 1413 | const uschar * p = rr->data; |
e5a9dba6 PH |
1414 | |
1415 | /* Extract the numerical SRV fields (p is incremented) */ | |
1416 | ||
e5a9dba6 PH |
1417 | GETSHORT(priority, p); |
1418 | GETSHORT(weight, p); | |
1419 | GETSHORT(port, p); | |
1420 | ||
1421 | DEBUG(D_acl) | |
e1d04f48 | 1422 | debug_printf_indent("CSA priority=%d weight=%d port=%d\n", priority, weight, port); |
e5a9dba6 PH |
1423 | |
1424 | /* Check the CSA version number */ | |
1425 | ||
1426 | if (priority != 1) continue; | |
1427 | ||
1428 | /* If the domain does not have a CSA SRV record of its own (i.e. the domain | |
1429 | found by dns_special_lookup() is a parent of the one we asked for), we check | |
1430 | the subdomain assertions in the port field. At the moment there's only one | |
1431 | assertion: legitimate SMTP clients are all explicitly authorized with CSA | |
1432 | SRV records of their own. */ | |
1433 | ||
1dc92d5a | 1434 | if (Ustrcmp(found, domain) != 0) |
dd708fd7 | 1435 | return t->data.val = port & 1 ? CSA_FAIL_EXPLICIT : CSA_UNKNOWN; |
e5a9dba6 PH |
1436 | |
1437 | /* This CSA SRV record refers directly to our domain, so we check the value | |
1438 | in the weight field to work out the domain's authorization. 0 and 1 are | |
1439 | unauthorized; 3 means the client is authorized but we can't check the IP | |
1440 | address in order to authenticate it, so we treat it as unknown; values | |
1441 | greater than 3 are undefined. */ | |
1442 | ||
1443 | if (weight < 2) return t->data.val = CSA_FAIL_DOMAIN; | |
1444 | ||
1445 | if (weight > 2) continue; | |
1446 | ||
1447 | /* Weight == 2, which means the domain is authorized. We must check that the | |
1448 | client's IP address is listed as one of the SRV target addresses. Save the | |
1449 | target hostname then break to scan the additional data for its addresses. */ | |
1450 | ||
1451 | (void)dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, | |
1452 | (DN_EXPAND_ARG4_TYPE)target, sizeof(target)); | |
1453 | ||
e1d04f48 | 1454 | DEBUG(D_acl) debug_printf_indent("CSA target is %s\n", target); |
e5a9dba6 PH |
1455 | |
1456 | break; | |
1457 | } | |
1458 | ||
1459 | /* If we didn't break the loop then no appropriate records were found. */ | |
1460 | ||
1461 | if (rr == NULL) return t->data.val = CSA_UNKNOWN; | |
1462 | ||
1463 | /* Do not check addresses if the target is ".", in accordance with RFC 2782. | |
1464 | A target of "." indicates there are no valid addresses, so the client cannot | |
1465 | be authorized. (This is an odd configuration because weight=2 target=. is | |
1466 | equivalent to weight=1, but we check for it in order to keep load off the | |
1467 | root name servers.) Note that dn_expand() turns "." into "". */ | |
1468 | ||
1469 | if (Ustrcmp(target, "") == 0) return t->data.val = CSA_FAIL_NOADDR; | |
1470 | ||
1471 | /* Scan the additional section of the CSA SRV reply for addresses belonging | |
1472 | to the target. If the name server didn't return any additional data (e.g. | |
1473 | because it does not fully support SRV records), we need to do another lookup | |
1474 | to obtain the target addresses; otherwise we have a definitive result. */ | |
1475 | ||
1476 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ADDITIONAL, target); | |
1477 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1478 | ||
1479 | /* The DNS lookup type corresponds to the IP version used by the client. */ | |
1480 | ||
1481 | #if HAVE_IPV6 | |
1482 | if (Ustrchr(sender_host_address, ':') != NULL) | |
1483 | type = T_AAAA; | |
1484 | else | |
1485 | #endif /* HAVE_IPV6 */ | |
1486 | type = T_A; | |
1487 | ||
1488 | ||
4e0983dc | 1489 | lookup_dnssec_authenticated = NULL; |
e5a9dba6 PH |
1490 | switch (dns_lookup(&dnsa, target, type, NULL)) |
1491 | { | |
1492 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1493 | ||
1494 | default: | |
cc00f4af | 1495 | return t->data.val = CSA_DEFER_ADDR; |
e5a9dba6 PH |
1496 | |
1497 | /* If the query succeeded, scan the addresses and return the result. */ | |
1498 | ||
1499 | case DNS_SUCCEED: | |
cc00f4af JH |
1500 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ANSWERS, target); |
1501 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1502 | /* else fall through */ | |
e5a9dba6 PH |
1503 | |
1504 | /* If the target has no IP addresses, the client cannot have an authorized | |
1505 | IP address. However, if the target site uses A6 records (not AAAA records) | |
1506 | we have to do yet another lookup in order to check them. */ | |
1507 | ||
1508 | case DNS_NOMATCH: | |
1509 | case DNS_NODATA: | |
cc00f4af | 1510 | return t->data.val = CSA_FAIL_NOADDR; |
e5a9dba6 PH |
1511 | } |
1512 | } | |
1513 | ||
1514 | ||
1515 | ||
059ec3d9 PH |
1516 | /************************************************* |
1517 | * Handle verification (address & other) * | |
1518 | *************************************************/ | |
1519 | ||
89583014 | 1520 | enum { VERIFY_REV_HOST_LKUP, VERIFY_CERT, VERIFY_HELO, VERIFY_CSA, VERIFY_HDR_SYNTAX, |
770747fd | 1521 | VERIFY_NOT_BLIND, VERIFY_HDR_SNDR, VERIFY_SNDR, VERIFY_RCPT, |
e3a69b62 | 1522 | VERIFY_HDR_NAMES_ASCII, VERIFY_ARC |
89583014 JH |
1523 | }; |
1524 | typedef struct { | |
1525 | uschar * name; | |
1526 | int value; | |
1527 | unsigned where_allowed; /* bitmap */ | |
1528 | BOOL no_options; /* Never has /option(s) following */ | |
1529 | unsigned alt_opt_sep; /* >0 Non-/ option separator (custom parser) */ | |
1530 | } verify_type_t; | |
1531 | static verify_type_t verify_type_list[] = { | |
f2ed27cf | 1532 | /* name value where no-opt opt-sep */ |
7e8360e6 | 1533 | { US"reverse_host_lookup", VERIFY_REV_HOST_LKUP, ~0, FALSE, 0 }, |
e3a69b62 JH |
1534 | { US"certificate", VERIFY_CERT, ~0, TRUE, 0 }, |
1535 | { US"helo", VERIFY_HELO, ~0, TRUE, 0 }, | |
89583014 | 1536 | { US"csa", VERIFY_CSA, ~0, FALSE, 0 }, |
e3a69b62 JH |
1537 | { US"header_syntax", VERIFY_HDR_SYNTAX, ACL_BIT_DATA | ACL_BIT_NOTSMTP, TRUE, 0 }, |
1538 | { US"not_blind", VERIFY_NOT_BLIND, ACL_BIT_DATA | ACL_BIT_NOTSMTP, TRUE, 0 }, | |
1539 | { US"header_sender", VERIFY_HDR_SNDR, ACL_BIT_DATA | ACL_BIT_NOTSMTP, FALSE, 0 }, | |
1540 | { US"sender", VERIFY_SNDR, ACL_BIT_MAIL | ACL_BIT_RCPT | |
1541 | |ACL_BIT_PREDATA | ACL_BIT_DATA | ACL_BIT_NOTSMTP, | |
89583014 | 1542 | FALSE, 6 }, |
e3a69b62 JH |
1543 | { US"recipient", VERIFY_RCPT, ACL_BIT_RCPT, FALSE, 0 }, |
1544 | { US"header_names_ascii", VERIFY_HDR_NAMES_ASCII, ACL_BIT_DATA | ACL_BIT_NOTSMTP, TRUE, 0 }, | |
1545 | #ifdef EXPERIMENTAL_ARC | |
1546 | { US"arc", VERIFY_ARC, ACL_BIT_DATA, TRUE , 0 }, | |
1547 | #endif | |
89583014 JH |
1548 | }; |
1549 | ||
1550 | ||
1551 | enum { CALLOUT_DEFER_OK, CALLOUT_NOCACHE, CALLOUT_RANDOM, CALLOUT_USE_SENDER, | |
1552 | CALLOUT_USE_POSTMASTER, CALLOUT_POSTMASTER, CALLOUT_FULLPOSTMASTER, | |
1553 | CALLOUT_MAILFROM, CALLOUT_POSTMASTER_MAILFROM, CALLOUT_MAXWAIT, CALLOUT_CONNECT, | |
57cc2785 | 1554 | CALLOUT_HOLD, CALLOUT_TIME /* TIME must be last */ |
89583014 JH |
1555 | }; |
1556 | typedef struct { | |
1557 | uschar * name; | |
1558 | int value; | |
1559 | int flag; | |
1560 | BOOL has_option; /* Has =option(s) following */ | |
1561 | BOOL timeval; /* Has a time value */ | |
1562 | } callout_opt_t; | |
1563 | static callout_opt_t callout_opt_list[] = { | |
f2ed27cf | 1564 | /* name value flag has-opt has-time */ |
89583014 JH |
1565 | { US"defer_ok", CALLOUT_DEFER_OK, 0, FALSE, FALSE }, |
1566 | { US"no_cache", CALLOUT_NOCACHE, vopt_callout_no_cache, FALSE, FALSE }, | |
1567 | { US"random", CALLOUT_RANDOM, vopt_callout_random, FALSE, FALSE }, | |
1568 | { US"use_sender", CALLOUT_USE_SENDER, vopt_callout_recipsender, FALSE, FALSE }, | |
1569 | { US"use_postmaster", CALLOUT_USE_POSTMASTER,vopt_callout_recippmaster, FALSE, FALSE }, | |
1570 | { US"postmaster_mailfrom",CALLOUT_POSTMASTER_MAILFROM,0, TRUE, FALSE }, | |
1571 | { US"postmaster", CALLOUT_POSTMASTER, 0, FALSE, FALSE }, | |
1572 | { US"fullpostmaster", CALLOUT_FULLPOSTMASTER,vopt_callout_fullpm, FALSE, FALSE }, | |
1573 | { US"mailfrom", CALLOUT_MAILFROM, 0, TRUE, FALSE }, | |
1574 | { US"maxwait", CALLOUT_MAXWAIT, 0, TRUE, TRUE }, | |
1575 | { US"connect", CALLOUT_CONNECT, 0, TRUE, TRUE }, | |
57cc2785 | 1576 | { US"hold", CALLOUT_HOLD, vopt_callout_hold, FALSE, FALSE }, |
89583014 JH |
1577 | { NULL, CALLOUT_TIME, 0, FALSE, TRUE } |
1578 | }; | |
1579 | ||
1580 | ||
1581 | ||
059ec3d9 PH |
1582 | /* This function implements the "verify" condition. It is called when |
1583 | encountered in any ACL, because some tests are almost always permitted. Some | |
1584 | just don't make sense, and always fail (for example, an attempt to test a host | |
1585 | lookup for a non-TCP/IP message). Others are restricted to certain ACLs. | |
1586 | ||
1587 | Arguments: | |
1588 | where where called from | |
1589 | addr the recipient address that the ACL is handling, or NULL | |
1590 | arg the argument of "verify" | |
1591 | user_msgptr pointer for user message | |
1592 | log_msgptr pointer for log message | |
1593 | basic_errno where to put verify errno | |
1594 | ||
1595 | Returns: OK verification condition succeeded | |
1596 | FAIL verification failed | |
1597 | DEFER there was a problem verifying | |
1598 | ERROR syntax error | |
1599 | */ | |
1600 | ||
1601 | static int | |
55414b25 | 1602 | acl_verify(int where, address_item *addr, const uschar *arg, |
059ec3d9 PH |
1603 | uschar **user_msgptr, uschar **log_msgptr, int *basic_errno) |
1604 | { | |
1605 | int sep = '/'; | |
1606 | int callout = -1; | |
1607 | int callout_overall = -1; | |
4deaf07d | 1608 | int callout_connect = -1; |
059ec3d9 PH |
1609 | int verify_options = 0; |
1610 | int rc; | |
1611 | BOOL verify_header_sender = FALSE; | |
1612 | BOOL defer_ok = FALSE; | |
1613 | BOOL callout_defer_ok = FALSE; | |
1614 | BOOL no_details = FALSE; | |
eafd343b | 1615 | BOOL success_on_redirect = FALSE; |
059ec3d9 PH |
1616 | address_item *sender_vaddr = NULL; |
1617 | uschar *verify_sender_address = NULL; | |
1618 | uschar *pm_mailfrom = NULL; | |
1619 | uschar *se_mailfrom = NULL; | |
596875b3 PH |
1620 | |
1621 | /* Some of the verify items have slash-separated options; some do not. Diagnose | |
89583014 | 1622 | an error if options are given for items that don't expect them. |
596875b3 PH |
1623 | */ |
1624 | ||
1625 | uschar *slash = Ustrchr(arg, '/'); | |
55414b25 | 1626 | const uschar *list = arg; |
059ec3d9 | 1627 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); |
89583014 | 1628 | verify_type_t * vp; |
059ec3d9 | 1629 | |
e3a69b62 | 1630 | if (!ss) goto BAD_VERIFY; |
059ec3d9 PH |
1631 | |
1632 | /* Handle name/address consistency verification in a separate function. */ | |
1633 | ||
89583014 | 1634 | for (vp= verify_type_list; |
5903c6ff | 1635 | CS vp < CS verify_type_list + sizeof(verify_type_list); |
89583014 JH |
1636 | vp++ |
1637 | ) | |
1638 | if (vp->alt_opt_sep ? strncmpic(ss, vp->name, vp->alt_opt_sep) == 0 | |
1639 | : strcmpic (ss, vp->name) == 0) | |
1640 | break; | |
5903c6ff | 1641 | if (CS vp >= CS verify_type_list + sizeof(verify_type_list)) |
89583014 JH |
1642 | goto BAD_VERIFY; |
1643 | ||
e3a69b62 | 1644 | if (vp->no_options && slash) |
059ec3d9 | 1645 | { |
89583014 JH |
1646 | *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" " |
1647 | "(this verify item has no options)", arg); | |
1648 | return ERROR; | |
059ec3d9 | 1649 | } |
e3a69b62 | 1650 | if (!(vp->where_allowed & BIT(where))) |
059ec3d9 | 1651 | { |
e3a69b62 JH |
1652 | *log_msgptr = string_sprintf("cannot verify %s in ACL for %s", |
1653 | vp->name, acl_wherenames[where]); | |
89583014 | 1654 | return ERROR; |
059ec3d9 | 1655 | } |
89583014 | 1656 | switch(vp->value) |
596875b3 | 1657 | { |
89583014 | 1658 | case VERIFY_REV_HOST_LKUP: |
617d3932 | 1659 | if (!sender_host_address) return OK; |
7e8360e6 | 1660 | if ((rc = acl_verify_reverse(user_msgptr, log_msgptr)) == DEFER) |
617d3932 | 1661 | while ((ss = string_nextinlist(&list, &sep, NULL, 0))) |
7e8360e6 JH |
1662 | if (strcmpic(ss, US"defer_ok") == 0) |
1663 | return OK; | |
1664 | return rc; | |
059ec3d9 | 1665 | |
89583014 JH |
1666 | case VERIFY_CERT: |
1667 | /* TLS certificate verification is done at STARTTLS time; here we just | |
1668 | test whether it was successful or not. (This is for optional verification; for | |
1669 | mandatory verification, the connection doesn't last this long.) */ | |
e5a9dba6 | 1670 | |
3703d818 JH |
1671 | if (tls_in.certificate_verified) return OK; |
1672 | *user_msgptr = US"no verified certificate"; | |
1673 | return FAIL; | |
e5a9dba6 | 1674 | |
89583014 JH |
1675 | case VERIFY_HELO: |
1676 | /* We can test the result of optional HELO verification that might have | |
1677 | occurred earlier. If not, we can attempt the verification now. */ | |
059ec3d9 | 1678 | |
3703d818 | 1679 | if (!helo_verified && !helo_verify_failed) smtp_verify_helo(); |
617d3932 | 1680 | return helo_verified ? OK : FAIL; |
059ec3d9 | 1681 | |
89583014 JH |
1682 | case VERIFY_CSA: |
1683 | /* Do Client SMTP Authorization checks in a separate function, and turn the | |
1684 | result code into user-friendly strings. */ | |
1c41c9cc | 1685 | |
3703d818 JH |
1686 | rc = acl_verify_csa(list); |
1687 | *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s", | |
89583014 | 1688 | csa_reason_string[rc]); |
3703d818 | 1689 | csa_status = csa_status_string[rc]; |
e1d04f48 | 1690 | DEBUG(D_acl) debug_printf_indent("CSA result %s\n", csa_status); |
3703d818 | 1691 | return csa_return_code[rc]; |
89583014 | 1692 | |
617d3932 JH |
1693 | #ifdef EXPERIMENTAL_ARC |
1694 | case VERIFY_ARC: | |
1695 | { /* Do Authenticated Received Chain checks in a separate function. */ | |
1696 | const uschar * condlist = CUS string_nextinlist(&list, &sep, NULL, 0); | |
1697 | int csep = 0; | |
1698 | uschar * cond; | |
1699 | ||
1700 | if (!(arc_state = acl_verify_arc())) return DEFER; | |
1701 | DEBUG(D_acl) debug_printf_indent("ARC verify result %s\n", arc_state); | |
1702 | ||
1703 | if (!condlist) condlist = US"none:pass"; | |
1704 | while ((cond = string_nextinlist(&condlist, &csep, NULL, 0))) | |
1705 | if (Ustrcmp(arc_state, cond) == 0) return OK; | |
1706 | return FAIL; | |
1707 | } | |
1708 | #endif | |
1709 | ||
89583014 | 1710 | case VERIFY_HDR_SYNTAX: |
db57e575 | 1711 | /* Check that all relevant header lines have the correct 5322-syntax. If there is |
89583014 JH |
1712 | a syntax error, we return details of the error to the sender if configured to |
1713 | send out full details. (But a "message" setting on the ACL can override, as | |
1714 | always). */ | |
1715 | ||
1716 | rc = verify_check_headers(log_msgptr); | |
3703d818 JH |
1717 | if (rc != OK && *log_msgptr) |
1718 | if (smtp_return_error_details) | |
1719 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1720 | else | |
1721 | acl_verify_message = *log_msgptr; | |
89583014 | 1722 | return rc; |
059ec3d9 | 1723 | |
770747fd MFM |
1724 | case VERIFY_HDR_NAMES_ASCII: |
1725 | /* Check that all header names are true 7 bit strings | |
1726 | See RFC 5322, 2.2. and RFC 6532, 3. */ | |
1727 | ||
1728 | rc = verify_check_header_names_ascii(log_msgptr); | |
617d3932 | 1729 | if (rc != OK && smtp_return_error_details && *log_msgptr) |
770747fd MFM |
1730 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); |
1731 | return rc; | |
1732 | ||
89583014 JH |
1733 | case VERIFY_NOT_BLIND: |
1734 | /* Check that no recipient of this message is "blind", that is, every envelope | |
1735 | recipient must be mentioned in either To: or Cc:. */ | |
059ec3d9 | 1736 | |
617d3932 | 1737 | if ((rc = verify_check_notblind()) != OK) |
89583014 JH |
1738 | { |
1739 | *log_msgptr = string_sprintf("bcc recipient detected"); | |
1740 | if (smtp_return_error_details) | |
1741 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1742 | } | |
1743 | return rc; | |
059ec3d9 | 1744 | |
89583014 JH |
1745 | /* The remaining verification tests check recipient and sender addresses, |
1746 | either from the envelope or from the header. There are a number of | |
1747 | slash-separated options that are common to all of them. */ | |
059ec3d9 | 1748 | |
89583014 JH |
1749 | case VERIFY_HDR_SNDR: |
1750 | verify_header_sender = TRUE; | |
1751 | break; | |
059ec3d9 | 1752 | |
89583014 JH |
1753 | case VERIFY_SNDR: |
1754 | /* In the case of a sender, this can optionally be followed by an address to use | |
1755 | in place of the actual sender (rare special-case requirement). */ | |
059ec3d9 | 1756 | { |
89583014 JH |
1757 | uschar *s = ss + 6; |
1758 | if (*s == 0) | |
1759 | verify_sender_address = sender_address; | |
1760 | else | |
1761 | { | |
1762 | while (isspace(*s)) s++; | |
1763 | if (*s++ != '=') goto BAD_VERIFY; | |
1764 | while (isspace(*s)) s++; | |
1765 | verify_sender_address = string_copy(s); | |
1766 | } | |
059ec3d9 | 1767 | } |
89583014 JH |
1768 | break; |
1769 | ||
1770 | case VERIFY_RCPT: | |
1771 | break; | |
059ec3d9 PH |
1772 | } |
1773 | ||
89583014 JH |
1774 | |
1775 | ||
596875b3 PH |
1776 | /* Remaining items are optional; they apply to sender and recipient |
1777 | verification, including "header sender" verification. */ | |
059ec3d9 PH |
1778 | |
1779 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) | |
1780 | != NULL) | |
1781 | { | |
1782 | if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE; | |
1783 | else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE; | |
eafd343b | 1784 | else if (strcmpic(ss, US"success_on_redirect") == 0) success_on_redirect = TRUE; |
059ec3d9 PH |
1785 | |
1786 | /* These two old options are left for backwards compatibility */ | |
1787 | ||
1788 | else if (strcmpic(ss, US"callout_defer_ok") == 0) | |
1789 | { | |
1790 | callout_defer_ok = TRUE; | |
1791 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1792 | } | |
1793 | ||
1794 | else if (strcmpic(ss, US"check_postmaster") == 0) | |
1795 | { | |
1796 | pm_mailfrom = US""; | |
1797 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1798 | } | |
1799 | ||
1800 | /* The callout option has a number of sub-options, comma separated */ | |
1801 | ||
1802 | else if (strncmpic(ss, US"callout", 7) == 0) | |
1803 | { | |
1804 | callout = CALLOUT_TIMEOUT_DEFAULT; | |
1805 | ss += 7; | |
1806 | if (*ss != 0) | |
1807 | { | |
1808 | while (isspace(*ss)) ss++; | |
1809 | if (*ss++ == '=') | |
1810 | { | |
55414b25 | 1811 | const uschar * sublist = ss; |
059ec3d9 PH |
1812 | int optsep = ','; |
1813 | uschar *opt; | |
1814 | uschar buffer[256]; | |
55414b25 | 1815 | while (isspace(*sublist)) sublist++; |
8e669ac1 | 1816 | |
57cc2785 | 1817 | while ((opt = string_nextinlist(&sublist, &optsep, buffer, sizeof(buffer)))) |
059ec3d9 | 1818 | { |
89583014 | 1819 | callout_opt_t * op; |
438257ba | 1820 | double period = 1.0F; |
059ec3d9 | 1821 | |
89583014 | 1822 | for (op= callout_opt_list; op->name; op++) |
438257ba | 1823 | if (strncmpic(opt, op->name, Ustrlen(op->name)) == 0) |
89583014 | 1824 | break; |
059ec3d9 | 1825 | |
89583014 JH |
1826 | verify_options |= op->flag; |
1827 | if (op->has_option) | |
1828 | { | |
438257ba | 1829 | opt += Ustrlen(op->name); |
4deaf07d PH |
1830 | while (isspace(*opt)) opt++; |
1831 | if (*opt++ != '=') | |
1832 | { | |
1833 | *log_msgptr = string_sprintf("'=' expected after " | |
89583014 | 1834 | "\"%s\" in ACL verify condition \"%s\"", op->name, arg); |
4deaf07d PH |
1835 | return ERROR; |
1836 | } | |
1837 | while (isspace(*opt)) opt++; | |
89583014 | 1838 | } |
57cc2785 | 1839 | if (op->timeval && (period = readconf_readtime(opt, 0, FALSE)) < 0) |
89583014 | 1840 | { |
57cc2785 JH |
1841 | *log_msgptr = string_sprintf("bad time value in ACL condition " |
1842 | "\"verify %s\"", arg); | |
1843 | return ERROR; | |
89583014 JH |
1844 | } |
1845 | ||
1846 | switch(op->value) | |
1847 | { | |
1848 | case CALLOUT_DEFER_OK: callout_defer_ok = TRUE; break; | |
1849 | case CALLOUT_POSTMASTER: pm_mailfrom = US""; break; | |
1850 | case CALLOUT_FULLPOSTMASTER: pm_mailfrom = US""; break; | |
1851 | case CALLOUT_MAILFROM: | |
1852 | if (!verify_header_sender) | |
1853 | { | |
1854 | *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a " | |
1855 | "callout option only for verify=header_sender (detected in ACL " | |
1856 | "condition \"%s\")", arg); | |
1857 | return ERROR; | |
1858 | } | |
1859 | se_mailfrom = string_copy(opt); | |
1860 | break; | |
1861 | case CALLOUT_POSTMASTER_MAILFROM: pm_mailfrom = string_copy(opt); break; | |
1862 | case CALLOUT_MAXWAIT: callout_overall = period; break; | |
1863 | case CALLOUT_CONNECT: callout_connect = period; break; | |
1864 | case CALLOUT_TIME: callout = period; break; | |
1865 | } | |
059ec3d9 PH |
1866 | } |
1867 | } | |
1868 | else | |
1869 | { | |
1870 | *log_msgptr = string_sprintf("'=' expected after \"callout\" in " | |
1871 | "ACL condition \"%s\"", arg); | |
1872 | return ERROR; | |
1873 | } | |
1874 | } | |
1875 | } | |
1876 | ||
1877 | /* Option not recognized */ | |
1878 | ||
1879 | else | |
1880 | { | |
1881 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " | |
1882 | "condition \"verify %s\"", ss, arg); | |
1883 | return ERROR; | |
1884 | } | |
1885 | } | |
1886 | ||
1887 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == | |
1888 | (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1889 | { | |
1890 | *log_msgptr = US"only one of use_sender and use_postmaster can be set " | |
1891 | "for a recipient callout"; | |
1892 | return ERROR; | |
1893 | } | |
1894 | ||
1895 | /* Handle sender-in-header verification. Default the user message to the log | |
1896 | message if giving out verification details. */ | |
1897 | ||
1898 | if (verify_header_sender) | |
1899 | { | |
8e669ac1 | 1900 | int verrno; |
2f682e45 JH |
1901 | |
1902 | if ((rc = verify_check_header_address(user_msgptr, log_msgptr, callout, | |
fe5b5d0b | 1903 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, verify_options, |
2f682e45 | 1904 | &verrno)) != OK) |
8e669ac1 | 1905 | { |
fe5b5d0b PH |
1906 | *basic_errno = verrno; |
1907 | if (smtp_return_error_details) | |
1908 | { | |
2f682e45 | 1909 | if (!*user_msgptr && *log_msgptr) |
fe5b5d0b PH |
1910 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); |
1911 | if (rc == DEFER) acl_temp_details = TRUE; | |
1912 | } | |
8e669ac1 | 1913 | } |
059ec3d9 PH |
1914 | } |
1915 | ||
1916 | /* Handle a sender address. The default is to verify *the* sender address, but | |
1917 | optionally a different address can be given, for special requirements. If the | |
1918 | address is empty, we are dealing with a bounce message that has no sender, so | |
1919 | we cannot do any checking. If the real sender address gets rewritten during | |
1920 | verification (e.g. DNS widening), set the flag to stop it being rewritten again | |
1921 | during message reception. | |
1922 | ||
1923 | A list of verified "sender" addresses is kept to try to avoid doing to much | |
1924 | work repetitively when there are multiple recipients in a message and they all | |
1925 | require sender verification. However, when callouts are involved, it gets too | |
1926 | complicated because different recipients may require different callout options. | |
1927 | Therefore, we always do a full sender verify when any kind of callout is | |
1928 | specified. Caching elsewhere, for instance in the DNS resolver and in the | |
1929 | callout handling, should ensure that this is not terribly inefficient. */ | |
1930 | ||
2f682e45 | 1931 | else if (verify_sender_address) |
059ec3d9 | 1932 | { |
2f682e45 | 1933 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster))) |
059ec3d9 PH |
1934 | { |
1935 | *log_msgptr = US"use_sender or use_postmaster cannot be used for a " | |
1936 | "sender verify callout"; | |
1937 | return ERROR; | |
1938 | } | |
1939 | ||
1940 | sender_vaddr = verify_checked_sender(verify_sender_address); | |
1941 | if (sender_vaddr != NULL && /* Previously checked */ | |
1942 | callout <= 0) /* No callout needed this time */ | |
1943 | { | |
1944 | /* If the "routed" flag is set, it means that routing worked before, so | |
1945 | this check can give OK (the saved return code value, if set, belongs to a | |
1946 | callout that was done previously). If the "routed" flag is not set, routing | |
1947 | must have failed, so we use the saved return code. */ | |
1948 | ||
2f682e45 JH |
1949 | if (testflag(sender_vaddr, af_verify_routed)) |
1950 | rc = OK; | |
1951 | else | |
059ec3d9 PH |
1952 | { |
1953 | rc = sender_vaddr->special_action; | |
1954 | *basic_errno = sender_vaddr->basic_errno; | |
1955 | } | |
e1d04f48 | 1956 | HDEBUG(D_acl) debug_printf_indent("using cached sender verify result\n"); |
059ec3d9 PH |
1957 | } |
1958 | ||
1959 | /* Do a new verification, and cache the result. The cache is used to avoid | |
1960 | verifying the sender multiple times for multiple RCPTs when callouts are not | |
1961 | specified (see comments above). | |
1962 | ||
1963 | The cache is also used on failure to give details in response to the first | |
1964 | RCPT that gets bounced for this reason. However, this can be suppressed by | |
1965 | the no_details option, which sets the flag that says "this detail has already | |
1966 | been sent". The cache normally contains just one address, but there may be | |
1967 | more in esoteric circumstances. */ | |
1968 | ||
1969 | else | |
1970 | { | |
1971 | BOOL routed = TRUE; | |
2a3eea10 | 1972 | uschar *save_address_data = deliver_address_data; |
8e669ac1 | 1973 | |
059ec3d9 | 1974 | sender_vaddr = deliver_make_addr(verify_sender_address, TRUE); |
8c5d388a | 1975 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
1976 | if ((sender_vaddr->prop.utf8_msg = message_smtputf8)) |
1977 | { | |
1978 | sender_vaddr->prop.utf8_downcvt = message_utf8_downconvert == 1; | |
1979 | sender_vaddr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1; | |
1980 | } | |
f358d5e0 | 1981 | #endif |
059ec3d9 PH |
1982 | if (no_details) setflag(sender_vaddr, af_sverify_told); |
1983 | if (verify_sender_address[0] != 0) | |
1984 | { | |
1985 | /* If this is the real sender address, save the unrewritten version | |
1986 | for use later in receive. Otherwise, set a flag so that rewriting the | |
1987 | sender in verify_address() does not update sender_address. */ | |
1988 | ||
1989 | if (verify_sender_address == sender_address) | |
1990 | sender_address_unrewritten = sender_address; | |
1991 | else | |
1992 | verify_options |= vopt_fake_sender; | |
1993 | ||
eafd343b TK |
1994 | if (success_on_redirect) |
1995 | verify_options |= vopt_success_on_redirect; | |
1996 | ||
059ec3d9 PH |
1997 | /* The recipient, qualify, and expn options are never set in |
1998 | verify_options. */ | |
1999 | ||
2000 | rc = verify_address(sender_vaddr, NULL, verify_options, callout, | |
4deaf07d | 2001 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, &routed); |
059ec3d9 | 2002 | |
e1d04f48 | 2003 | HDEBUG(D_acl) debug_printf_indent("----------- end verify ------------\n"); |
059ec3d9 | 2004 | |
2f682e45 JH |
2005 | if (rc != OK) |
2006 | *basic_errno = sender_vaddr->basic_errno; | |
2007 | else | |
2008 | DEBUG(D_acl) | |
2009 | { | |
2010 | if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0) | |
e1d04f48 | 2011 | debug_printf_indent("sender %s verified ok as %s\n", |
2f682e45 JH |
2012 | verify_sender_address, sender_vaddr->address); |
2013 | else | |
e1d04f48 | 2014 | debug_printf_indent("sender %s verified ok\n", |
2f682e45 JH |
2015 | verify_sender_address); |
2016 | } | |
059ec3d9 | 2017 | } |
2f682e45 JH |
2018 | else |
2019 | rc = OK; /* Null sender */ | |
059ec3d9 PH |
2020 | |
2021 | /* Cache the result code */ | |
2022 | ||
2023 | if (routed) setflag(sender_vaddr, af_verify_routed); | |
2024 | if (callout > 0) setflag(sender_vaddr, af_verify_callout); | |
2025 | sender_vaddr->special_action = rc; | |
2026 | sender_vaddr->next = sender_verified_list; | |
2027 | sender_verified_list = sender_vaddr; | |
8e669ac1 PH |
2028 | |
2029 | /* Restore the recipient address data, which might have been clobbered by | |
2a3eea10 | 2030 | the sender verification. */ |
8e669ac1 | 2031 | |
2a3eea10 | 2032 | deliver_address_data = save_address_data; |
059ec3d9 | 2033 | } |
8e669ac1 | 2034 | |
2a3eea10 PH |
2035 | /* Put the sender address_data value into $sender_address_data */ |
2036 | ||
d43cbe25 | 2037 | sender_address_data = sender_vaddr->prop.address_data; |
059ec3d9 PH |
2038 | } |
2039 | ||
2040 | /* A recipient address just gets a straightforward verify; again we must handle | |
2041 | the DEFER overrides. */ | |
2042 | ||
2043 | else | |
2044 | { | |
2045 | address_item addr2; | |
2046 | ||
eafd343b TK |
2047 | if (success_on_redirect) |
2048 | verify_options |= vopt_success_on_redirect; | |
2049 | ||
059ec3d9 PH |
2050 | /* We must use a copy of the address for verification, because it might |
2051 | get rewritten. */ | |
2052 | ||
2053 | addr2 = *addr; | |
2054 | rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout, | |
4deaf07d | 2055 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, NULL); |
e1d04f48 | 2056 | HDEBUG(D_acl) debug_printf_indent("----------- end verify ------------\n"); |
8e669ac1 | 2057 | |
42855d71 | 2058 | *basic_errno = addr2.basic_errno; |
059ec3d9 | 2059 | *log_msgptr = addr2.message; |
8e669ac1 | 2060 | *user_msgptr = (addr2.user_message != NULL)? |
6729cf78 | 2061 | addr2.user_message : addr2.message; |
42855d71 PH |
2062 | |
2063 | /* Allow details for temporary error if the address is so flagged. */ | |
2064 | if (testflag((&addr2), af_pass_message)) acl_temp_details = TRUE; | |
059ec3d9 PH |
2065 | |
2066 | /* Make $address_data visible */ | |
d43cbe25 | 2067 | deliver_address_data = addr2.prop.address_data; |
059ec3d9 PH |
2068 | } |
2069 | ||
2070 | /* We have a result from the relevant test. Handle defer overrides first. */ | |
2071 | ||
2072 | if (rc == DEFER && (defer_ok || | |
2073 | (callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER))) | |
2074 | { | |
e1d04f48 | 2075 | HDEBUG(D_acl) debug_printf_indent("verify defer overridden by %s\n", |
059ec3d9 PH |
2076 | defer_ok? "defer_ok" : "callout_defer_ok"); |
2077 | rc = OK; | |
2078 | } | |
2079 | ||
2080 | /* If we've failed a sender, set up a recipient message, and point | |
2081 | sender_verified_failed to the address item that actually failed. */ | |
2082 | ||
2083 | if (rc != OK && verify_sender_address != NULL) | |
2084 | { | |
2085 | if (rc != DEFER) | |
059ec3d9 | 2086 | *log_msgptr = *user_msgptr = US"Sender verify failed"; |
059ec3d9 | 2087 | else if (*basic_errno != ERRNO_CALLOUTDEFER) |
059ec3d9 | 2088 | *log_msgptr = *user_msgptr = US"Could not complete sender verify"; |
059ec3d9 PH |
2089 | else |
2090 | { | |
2091 | *log_msgptr = US"Could not complete sender verify callout"; | |
2092 | *user_msgptr = smtp_return_error_details? sender_vaddr->user_message : | |
2093 | *log_msgptr; | |
2094 | } | |
2095 | ||
2096 | sender_verified_failed = sender_vaddr; | |
2097 | } | |
2098 | ||
2099 | /* Verifying an address messes up the values of $domain and $local_part, | |
2100 | so reset them before returning if this is a RCPT ACL. */ | |
2101 | ||
2102 | if (addr != NULL) | |
2103 | { | |
2104 | deliver_domain = addr->domain; | |
2105 | deliver_localpart = addr->local_part; | |
2106 | } | |
2107 | return rc; | |
2108 | ||
2109 | /* Syntax errors in the verify argument come here. */ | |
2110 | ||
2111 | BAD_VERIFY: | |
2112 | *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", " | |
770747fd MFM |
2113 | "\"helo\", \"header_syntax\", \"header_sender\", \"header_names_ascii\" " |
2114 | "or \"reverse_host_lookup\" at start of ACL condition " | |
059ec3d9 PH |
2115 | "\"verify %s\"", arg); |
2116 | return ERROR; | |
2117 | } | |
2118 | ||
2119 | ||
2120 | ||
2121 | ||
2122 | /************************************************* | |
2123 | * Check argument for control= modifier * | |
2124 | *************************************************/ | |
2125 | ||
2126 | /* Called from acl_check_condition() below | |
2127 | ||
2128 | Arguments: | |
2129 | arg the argument string for control= | |
2130 | pptr set to point to the terminating character | |
2131 | where which ACL we are in | |
2132 | log_msgptr for error messages | |
2133 | ||
2134 | Returns: CONTROL_xxx value | |
2135 | */ | |
2136 | ||
2137 | static int | |
55414b25 | 2138 | decode_control(const uschar *arg, const uschar **pptr, int where, uschar **log_msgptr) |
059ec3d9 | 2139 | { |
d7bed771 JH |
2140 | int idx, len; |
2141 | control_def * d; | |
059ec3d9 | 2142 | |
d7bed771 JH |
2143 | if ( (idx = find_control(arg, controls_list, nelem(controls_list))) < 0 |
2144 | || ( arg[len = Ustrlen((d = controls_list+idx)->name)] != 0 | |
2145 | && (!d->has_option || arg[len] != '/') | |
2146 | ) ) | |
059ec3d9 PH |
2147 | { |
2148 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2149 | return CONTROL_ERROR; | |
2150 | } | |
2151 | ||
059ec3d9 | 2152 | *pptr = arg + len; |
d7bed771 | 2153 | return idx; |
059ec3d9 PH |
2154 | } |
2155 | ||
2156 | ||
2157 | ||
c99ce5c9 TF |
2158 | |
2159 | /************************************************* | |
2160 | * Return a ratelimit error * | |
2161 | *************************************************/ | |
2162 | ||
2163 | /* Called from acl_ratelimit() below | |
2164 | ||
2165 | Arguments: | |
2166 | log_msgptr for error messages | |
2167 | format format string | |
2168 | ... supplementary arguments | |
2169 | ss ratelimit option name | |
2170 | where ACL_WHERE_xxxx indicating which ACL this is | |
2171 | ||
2172 | Returns: ERROR | |
2173 | */ | |
2174 | ||
2175 | static int | |
2176 | ratelimit_error(uschar **log_msgptr, const char *format, ...) | |
2177 | { | |
2178 | va_list ap; | |
2179 | uschar buffer[STRING_SPRINTF_BUFFER_SIZE]; | |
2180 | va_start(ap, format); | |
2181 | if (!string_vformat(buffer, sizeof(buffer), format, ap)) | |
2182 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
ef840681 | 2183 | "string_sprintf expansion was longer than " SIZE_T_FMT, sizeof(buffer)); |
c99ce5c9 TF |
2184 | va_end(ap); |
2185 | *log_msgptr = string_sprintf( | |
2186 | "error in arguments to \"ratelimit\" condition: %s", buffer); | |
2187 | return ERROR; | |
2188 | } | |
2189 | ||
2190 | ||
2191 | ||
2192 | ||
870f6ba8 TF |
2193 | /************************************************* |
2194 | * Handle rate limiting * | |
2195 | *************************************************/ | |
2196 | ||
2197 | /* Called by acl_check_condition() below to calculate the result | |
2198 | of the ACL ratelimit condition. | |
2199 | ||
2200 | Note that the return value might be slightly unexpected: if the | |
2201 | sender's rate is above the limit then the result is OK. This is | |
2202 | similar to the dnslists condition, and is so that you can write | |
2203 | ACL clauses like: defer ratelimit = 15 / 1h | |
2204 | ||
2205 | Arguments: | |
2206 | arg the option string for ratelimit= | |
90fc3069 | 2207 | where ACL_WHERE_xxxx indicating which ACL this is |
870f6ba8 TF |
2208 | log_msgptr for error messages |
2209 | ||
2210 | Returns: OK - Sender's rate is above limit | |
2211 | FAIL - Sender's rate is below limit | |
2212 | DEFER - Problem opening ratelimit database | |
2213 | ERROR - Syntax error in options. | |
2214 | */ | |
2215 | ||
2216 | static int | |
55414b25 | 2217 | acl_ratelimit(const uschar *arg, int where, uschar **log_msgptr) |
870f6ba8 | 2218 | { |
c99ce5c9 | 2219 | double limit, period, count; |
8f240103 PH |
2220 | uschar *ss; |
2221 | uschar *key = NULL; | |
c99ce5c9 | 2222 | uschar *unique = NULL; |
870f6ba8 | 2223 | int sep = '/'; |
c99ce5c9 TF |
2224 | BOOL leaky = FALSE, strict = FALSE, readonly = FALSE; |
2225 | BOOL noupdate = FALSE, badacl = FALSE; | |
2226 | int mode = RATE_PER_WHAT; | |
870f6ba8 TF |
2227 | int old_pool, rc; |
2228 | tree_node **anchor, *t; | |
2229 | open_db dbblock, *dbm; | |
c99ce5c9 | 2230 | int dbdb_size; |
870f6ba8 | 2231 | dbdata_ratelimit *dbd; |
c99ce5c9 | 2232 | dbdata_ratelimit_unique *dbdb; |
870f6ba8 TF |
2233 | struct timeval tv; |
2234 | ||
2235 | /* Parse the first two options and record their values in expansion | |
2236 | variables. These variables allow the configuration to have informative | |
2237 | error messages based on rate limits obtained from a table lookup. */ | |
2238 | ||
c99ce5c9 | 2239 | /* First is the maximum number of messages per period / maximum burst |
870f6ba8 TF |
2240 | size, which must be greater than or equal to zero. Zero is useful for |
2241 | rate measurement as opposed to rate limiting. */ | |
2242 | ||
2243 | sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0); | |
2244 | if (sender_rate_limit == NULL) | |
96f5fe4c JH |
2245 | return ratelimit_error(log_msgptr, "sender rate limit not set"); |
2246 | ||
2247 | limit = Ustrtod(sender_rate_limit, &ss); | |
2248 | if (tolower(*ss) == 'k') { limit *= 1024.0; ss++; } | |
2249 | else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; } | |
2250 | else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; } | |
2251 | ||
c99ce5c9 TF |
2252 | if (limit < 0.0 || *ss != '\0') |
2253 | return ratelimit_error(log_msgptr, | |
2254 | "\"%s\" is not a positive number", sender_rate_limit); | |
870f6ba8 | 2255 | |
c99ce5c9 | 2256 | /* Second is the rate measurement period / exponential smoothing time |
870f6ba8 TF |
2257 | constant. This must be strictly greater than zero, because zero leads to |
2258 | run-time division errors. */ | |
2259 | ||
2260 | sender_rate_period = string_nextinlist(&arg, &sep, NULL, 0); | |
2261 | if (sender_rate_period == NULL) period = -1.0; | |
2262 | else period = readconf_readtime(sender_rate_period, 0, FALSE); | |
2263 | if (period <= 0.0) | |
c99ce5c9 TF |
2264 | return ratelimit_error(log_msgptr, |
2265 | "\"%s\" is not a time value", sender_rate_period); | |
2266 | ||
2267 | /* By default we are counting one of something, but the per_rcpt, | |
2268 | per_byte, and count options can change this. */ | |
2269 | ||
2270 | count = 1.0; | |
870f6ba8 | 2271 | |
c99ce5c9 | 2272 | /* Parse the other options. */ |
870f6ba8 TF |
2273 | |
2274 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2275 | != NULL) | |
2276 | { | |
2277 | if (strcmpic(ss, US"leaky") == 0) leaky = TRUE; | |
2278 | else if (strcmpic(ss, US"strict") == 0) strict = TRUE; | |
8f240103 | 2279 | else if (strcmpic(ss, US"noupdate") == 0) noupdate = TRUE; |
c99ce5c9 TF |
2280 | else if (strcmpic(ss, US"readonly") == 0) readonly = TRUE; |
2281 | else if (strcmpic(ss, US"per_cmd") == 0) RATE_SET(mode, PER_CMD); | |
2282 | else if (strcmpic(ss, US"per_conn") == 0) | |
2283 | { | |
2284 | RATE_SET(mode, PER_CONN); | |
2285 | if (where == ACL_WHERE_NOTSMTP || where == ACL_WHERE_NOTSMTP_START) | |
2286 | badacl = TRUE; | |
2287 | } | |
2288 | else if (strcmpic(ss, US"per_mail") == 0) | |
2289 | { | |
2290 | RATE_SET(mode, PER_MAIL); | |
2291 | if (where > ACL_WHERE_NOTSMTP) badacl = TRUE; | |
2292 | } | |
2293 | else if (strcmpic(ss, US"per_rcpt") == 0) | |
2294 | { | |
2295 | /* If we are running in the RCPT ACL, then we'll count the recipients | |
2296 | one by one, but if we are running when we have accumulated the whole | |
2297 | list then we'll add them all in one batch. */ | |
2298 | if (where == ACL_WHERE_RCPT) | |
2299 | RATE_SET(mode, PER_RCPT); | |
2300 | else if (where >= ACL_WHERE_PREDATA && where <= ACL_WHERE_NOTSMTP) | |
2301 | RATE_SET(mode, PER_ALLRCPTS), count = (double)recipients_count; | |
2302 | else if (where == ACL_WHERE_MAIL || where > ACL_WHERE_NOTSMTP) | |
2303 | RATE_SET(mode, PER_RCPT), badacl = TRUE; | |
2304 | } | |
2305 | else if (strcmpic(ss, US"per_byte") == 0) | |
2306 | { | |
2307 | /* If we have not yet received the message data and there was no SIZE | |
4c04137d | 2308 | declaration on the MAIL command, then it's safe to just use a value of |
c99ce5c9 TF |
2309 | zero and let the recorded rate decay as if nothing happened. */ |
2310 | RATE_SET(mode, PER_MAIL); | |
2311 | if (where > ACL_WHERE_NOTSMTP) badacl = TRUE; | |
2312 | else count = message_size < 0 ? 0.0 : (double)message_size; | |
2313 | } | |
2314 | else if (strcmpic(ss, US"per_addr") == 0) | |
2315 | { | |
2316 | RATE_SET(mode, PER_RCPT); | |
438257ba | 2317 | if (where != ACL_WHERE_RCPT) badacl = TRUE, unique = US"*"; |
c99ce5c9 TF |
2318 | else unique = string_sprintf("%s@%s", deliver_localpart, deliver_domain); |
2319 | } | |
2320 | else if (strncmpic(ss, US"count=", 6) == 0) | |
2321 | { | |
2322 | uschar *e; | |
2323 | count = Ustrtod(ss+6, &e); | |
2324 | if (count < 0.0 || *e != '\0') | |
2325 | return ratelimit_error(log_msgptr, | |
2326 | "\"%s\" is not a positive number", ss); | |
2327 | } | |
2328 | else if (strncmpic(ss, US"unique=", 7) == 0) | |
2329 | unique = string_copy(ss + 7); | |
2330 | else if (key == NULL) | |
2331 | key = string_copy(ss); | |
2332 | else | |
2333 | key = string_sprintf("%s/%s", key, ss); | |
870f6ba8 TF |
2334 | } |
2335 | ||
c99ce5c9 TF |
2336 | /* Sanity check. When the badacl flag is set the update mode must either |
2337 | be readonly (which is the default if it is omitted) or, for backwards | |
2338 | compatibility, a combination of noupdate and strict or leaky. */ | |
2339 | ||
2340 | if (mode == RATE_PER_CLASH) | |
2341 | return ratelimit_error(log_msgptr, "conflicting per_* options"); | |
2342 | if (leaky + strict + readonly > 1) | |
2343 | return ratelimit_error(log_msgptr, "conflicting update modes"); | |
2344 | if (badacl && (leaky || strict) && !noupdate) | |
2345 | return ratelimit_error(log_msgptr, | |
2346 | "\"%s\" must not have /leaky or /strict option in %s ACL", | |
2347 | ratelimit_option_string[mode], acl_wherenames[where]); | |
2348 | ||
2349 | /* Set the default values of any unset options. In readonly mode we | |
2350 | perform the rate computation without any increment so that its value | |
2351 | decays to eventually allow over-limit senders through. */ | |
2352 | ||
2353 | if (noupdate) readonly = TRUE, leaky = strict = FALSE; | |
2354 | if (badacl) readonly = TRUE; | |
2355 | if (readonly) count = 0.0; | |
2356 | if (!strict && !readonly) leaky = TRUE; | |
2357 | if (mode == RATE_PER_WHAT) mode = RATE_PER_MAIL; | |
870f6ba8 | 2358 | |
8f240103 PH |
2359 | /* Create the lookup key. If there is no explicit key, use sender_host_address. |
2360 | If there is no sender_host_address (e.g. -bs or acl_not_smtp) then we simply | |
2361 | omit it. The smoothing constant (sender_rate_period) and the per_xxx options | |
2362 | are added to the key because they alter the meaning of the stored data. */ | |
2363 | ||
2364 | if (key == NULL) | |
2365 | key = (sender_host_address == NULL)? US"" : sender_host_address; | |
870f6ba8 | 2366 | |
c99ce5c9 | 2367 | key = string_sprintf("%s/%s/%s%s", |
8f240103 | 2368 | sender_rate_period, |
c99ce5c9 TF |
2369 | ratelimit_option_string[mode], |
2370 | unique == NULL ? "" : "unique/", | |
8f240103 | 2371 | key); |
870f6ba8 | 2372 | |
c99ce5c9 | 2373 | HDEBUG(D_acl) |
e1d04f48 | 2374 | debug_printf_indent("ratelimit condition count=%.0f %.1f/%s\n", count, limit, key); |
870f6ba8 | 2375 | |
8f240103 PH |
2376 | /* See if we have already computed the rate by looking in the relevant tree. |
2377 | For per-connection rate limiting, store tree nodes and dbdata in the permanent | |
c99ce5c9 TF |
2378 | pool so that they survive across resets. In readonly mode we only remember the |
2379 | result for the rest of this command in case a later command changes it. After | |
2380 | this bit of logic the code is independent of the per_* mode. */ | |
870f6ba8 | 2381 | |
870f6ba8 TF |
2382 | old_pool = store_pool; |
2383 | ||
c99ce5c9 TF |
2384 | if (readonly) |
2385 | anchor = &ratelimiters_cmd; | |
2386 | else switch(mode) { | |
2387 | case RATE_PER_CONN: | |
870f6ba8 TF |
2388 | anchor = &ratelimiters_conn; |
2389 | store_pool = POOL_PERM; | |
c99ce5c9 TF |
2390 | break; |
2391 | case RATE_PER_BYTE: | |
2392 | case RATE_PER_MAIL: | |
2393 | case RATE_PER_ALLRCPTS: | |
870f6ba8 | 2394 | anchor = &ratelimiters_mail; |
c99ce5c9 TF |
2395 | break; |
2396 | case RATE_PER_ADDR: | |
2397 | case RATE_PER_CMD: | |
2398 | case RATE_PER_RCPT: | |
fe0dab11 | 2399 | anchor = &ratelimiters_cmd; |
c99ce5c9 TF |
2400 | break; |
2401 | default: | |
3399bb60 | 2402 | anchor = NULL; /* silence an "unused" complaint */ |
c99ce5c9 TF |
2403 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, |
2404 | "internal ACL error: unknown ratelimit mode %d", mode); | |
2405 | break; | |
2406 | } | |
870f6ba8 | 2407 | |
c99ce5c9 TF |
2408 | t = tree_search(*anchor, key); |
2409 | if (t != NULL) | |
870f6ba8 TF |
2410 | { |
2411 | dbd = t->data.ptr; | |
2412 | /* The following few lines duplicate some of the code below. */ | |
8f240103 | 2413 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2414 | store_pool = old_pool; |
2415 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2416 | HDEBUG(D_acl) | |
e1d04f48 | 2417 | debug_printf_indent("ratelimit found pre-computed rate %s\n", sender_rate); |
870f6ba8 TF |
2418 | return rc; |
2419 | } | |
2420 | ||
c99ce5c9 TF |
2421 | /* We aren't using a pre-computed rate, so get a previously recorded rate |
2422 | from the database, which will be updated and written back if required. */ | |
870f6ba8 | 2423 | |
0a6c178c | 2424 | if (!(dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE))) |
870f6ba8 TF |
2425 | { |
2426 | store_pool = old_pool; | |
2427 | sender_rate = NULL; | |
e1d04f48 | 2428 | HDEBUG(D_acl) debug_printf_indent("ratelimit database not available\n"); |
870f6ba8 TF |
2429 | *log_msgptr = US"ratelimit database not available"; |
2430 | return DEFER; | |
2431 | } | |
c99ce5c9 TF |
2432 | dbdb = dbfn_read_with_length(dbm, key, &dbdb_size); |
2433 | dbd = NULL; | |
870f6ba8 TF |
2434 | |
2435 | gettimeofday(&tv, NULL); | |
2436 | ||
c99ce5c9 TF |
2437 | if (dbdb != NULL) |
2438 | { | |
2439 | /* Locate the basic ratelimit block inside the DB data. */ | |
e1d04f48 | 2440 | HDEBUG(D_acl) debug_printf_indent("ratelimit found key in database\n"); |
c99ce5c9 TF |
2441 | dbd = &dbdb->dbd; |
2442 | ||
2443 | /* Forget the old Bloom filter if it is too old, so that we count each | |
2444 | repeating event once per period. We don't simply clear and re-use the old | |
2445 | filter because we want its size to change if the limit changes. Note that | |
2446 | we keep the dbd pointer for copying the rate into the new data block. */ | |
2447 | ||
2448 | if(unique != NULL && tv.tv_sec > dbdb->bloom_epoch + period) | |
2449 | { | |
e1d04f48 | 2450 | HDEBUG(D_acl) debug_printf_indent("ratelimit discarding old Bloom filter\n"); |
c99ce5c9 TF |
2451 | dbdb = NULL; |
2452 | } | |
2453 | ||
2454 | /* Sanity check. */ | |
2455 | ||
2456 | if(unique != NULL && dbdb_size < sizeof(*dbdb)) | |
2457 | { | |
e1d04f48 | 2458 | HDEBUG(D_acl) debug_printf_indent("ratelimit discarding undersize Bloom filter\n"); |
c99ce5c9 TF |
2459 | dbdb = NULL; |
2460 | } | |
2461 | } | |
2462 | ||
2463 | /* Allocate a new data block if the database lookup failed | |
2464 | or the Bloom filter passed its age limit. */ | |
2465 | ||
2466 | if (dbdb == NULL) | |
2467 | { | |
2468 | if (unique == NULL) | |
2469 | { | |
2470 | /* No Bloom filter. This basic ratelimit block is initialized below. */ | |
e1d04f48 | 2471 | HDEBUG(D_acl) debug_printf_indent("ratelimit creating new rate data block\n"); |
c99ce5c9 TF |
2472 | dbdb_size = sizeof(*dbd); |
2473 | dbdb = store_get(dbdb_size); | |
2474 | } | |
2475 | else | |
2476 | { | |
2477 | int extra; | |
e1d04f48 | 2478 | HDEBUG(D_acl) debug_printf_indent("ratelimit creating new Bloom filter\n"); |
c99ce5c9 TF |
2479 | |
2480 | /* See the long comment below for an explanation of the magic number 2. | |
2481 | The filter has a minimum size in case the rate limit is very small; | |
2482 | this is determined by the definition of dbdata_ratelimit_unique. */ | |
2483 | ||
2484 | extra = (int)limit * 2 - sizeof(dbdb->bloom); | |
2485 | if (extra < 0) extra = 0; | |
2486 | dbdb_size = sizeof(*dbdb) + extra; | |
2487 | dbdb = store_get(dbdb_size); | |
2488 | dbdb->bloom_epoch = tv.tv_sec; | |
2489 | dbdb->bloom_size = sizeof(dbdb->bloom) + extra; | |
2490 | memset(dbdb->bloom, 0, dbdb->bloom_size); | |
2491 | ||
2492 | /* Preserve any basic ratelimit data (which is our longer-term memory) | |
2493 | by copying it from the discarded block. */ | |
2494 | ||
2495 | if (dbd != NULL) | |
2496 | { | |
2497 | dbdb->dbd = *dbd; | |
2498 | dbd = &dbdb->dbd; | |
2499 | } | |
2500 | } | |
2501 | } | |
2502 | ||
2503 | /* If we are counting unique events, find out if this event is new or not. | |
2504 | If the client repeats the event during the current period then it should be | |
2505 | counted. We skip this code in readonly mode for efficiency, because any | |
2506 | changes to the filter will be discarded and because count is already set to | |
2507 | zero. */ | |
2508 | ||
2509 | if (unique != NULL && !readonly) | |
2510 | { | |
2511 | /* We identify unique events using a Bloom filter. (You can find my | |
2512 | notes on Bloom filters at http://fanf.livejournal.com/81696.html) | |
2513 | With the per_addr option, an "event" is a recipient address, though the | |
2514 | user can use the unique option to define their own events. We only count | |
2515 | an event if we have not seen it before. | |
2516 | ||
2517 | We size the filter according to the rate limit, which (in leaky mode) | |
2518 | is the limit on the population of the filter. We allow 16 bits of space | |
2519 | per entry (see the construction code above) and we set (up to) 8 of them | |
2520 | when inserting an element (see the loop below). The probability of a false | |
2521 | positive (an event we have not seen before but which we fail to count) is | |
2522 | ||
2523 | size = limit * 16 | |
2524 | numhash = 8 | |
2525 | allzero = exp(-numhash * pop / size) | |
2526 | = exp(-0.5 * pop / limit) | |
2527 | fpr = pow(1 - allzero, numhash) | |
2528 | ||
2529 | For senders at the limit the fpr is 0.06% or 1 in 1700 | |
2530 | and for senders at half the limit it is 0.0006% or 1 in 170000 | |
2531 | ||
2532 | In strict mode the Bloom filter can fill up beyond the normal limit, in | |
2533 | which case the false positive rate will rise. This means that the | |
2534 | measured rate for very fast senders can bogusly drop off after a while. | |
2535 | ||
2536 | At twice the limit, the fpr is 2.5% or 1 in 40 | |
2537 | At four times the limit, it is 31% or 1 in 3.2 | |
2538 | ||
2539 | It takes ln(pop/limit) periods for an over-limit burst of pop events to | |
2540 | decay below the limit, and if this is more than one then the Bloom filter | |
2541 | will be discarded before the decay gets that far. The false positive rate | |
2542 | at this threshold is 9.3% or 1 in 10.7. */ | |
2543 | ||
2544 | BOOL seen; | |
2545 | unsigned n, hash, hinc; | |
2546 | uschar md5sum[16]; | |
2547 | md5 md5info; | |
2548 | ||
2549 | /* Instead of using eight independent hash values, we combine two values | |
2550 | using the formula h1 + n * h2. This does not harm the Bloom filter's | |
2551 | performance, and means the amount of hash we need is independent of the | |
2552 | number of bits we set in the filter. */ | |
2553 | ||
2554 | md5_start(&md5info); | |
2555 | md5_end(&md5info, unique, Ustrlen(unique), md5sum); | |
2556 | hash = md5sum[0] | md5sum[1] << 8 | md5sum[2] << 16 | md5sum[3] << 24; | |
2557 | hinc = md5sum[4] | md5sum[5] << 8 | md5sum[6] << 16 | md5sum[7] << 24; | |
2558 | ||
2559 | /* Scan the bits corresponding to this event. A zero bit means we have | |
2560 | not seen it before. Ensure all bits are set to record this event. */ | |
2561 | ||
e1d04f48 | 2562 | HDEBUG(D_acl) debug_printf_indent("ratelimit checking uniqueness of %s\n", unique); |
c99ce5c9 TF |
2563 | |
2564 | seen = TRUE; | |
2565 | for (n = 0; n < 8; n++, hash += hinc) | |
2566 | { | |
2567 | int bit = 1 << (hash % 8); | |
2568 | int byte = (hash / 8) % dbdb->bloom_size; | |
2569 | if ((dbdb->bloom[byte] & bit) == 0) | |
2570 | { | |
2571 | dbdb->bloom[byte] |= bit; | |
2572 | seen = FALSE; | |
2573 | } | |
2574 | } | |
2575 | ||
2576 | /* If this event has occurred before, do not count it. */ | |
2577 | ||
2578 | if (seen) | |
2579 | { | |
e1d04f48 | 2580 | HDEBUG(D_acl) debug_printf_indent("ratelimit event found in Bloom filter\n"); |
c99ce5c9 TF |
2581 | count = 0.0; |
2582 | } | |
2583 | else | |
e1d04f48 | 2584 | HDEBUG(D_acl) debug_printf_indent("ratelimit event added to Bloom filter\n"); |
c99ce5c9 TF |
2585 | } |
2586 | ||
2587 | /* If there was no previous ratelimit data block for this key, initialize | |
2588 | the new one, otherwise update the block from the database. The initial rate | |
2589 | is what would be computed by the code below for an infinite interval. */ | |
2590 | ||
870f6ba8 TF |
2591 | if (dbd == NULL) |
2592 | { | |
e1d04f48 | 2593 | HDEBUG(D_acl) debug_printf_indent("ratelimit initializing new key's rate data\n"); |
c99ce5c9 | 2594 | dbd = &dbdb->dbd; |
870f6ba8 TF |
2595 | dbd->time_stamp = tv.tv_sec; |
2596 | dbd->time_usec = tv.tv_usec; | |
c99ce5c9 | 2597 | dbd->rate = count; |
870f6ba8 TF |
2598 | } |
2599 | else | |
2600 | { | |
2601 | /* The smoothed rate is computed using an exponentially weighted moving | |
2602 | average adjusted for variable sampling intervals. The standard EWMA for | |
2603 | a fixed sampling interval is: f'(t) = (1 - a) * f(t) + a * f'(t - 1) | |
2604 | where f() is the measured value and f'() is the smoothed value. | |
2605 | ||
2606 | Old data decays out of the smoothed value exponentially, such that data n | |
2607 | samples old is multiplied by a^n. The exponential decay time constant p | |
2608 | is defined such that data p samples old is multiplied by 1/e, which means | |
2609 | that a = exp(-1/p). We can maintain the same time constant for a variable | |
2610 | sampling interval i by using a = exp(-i/p). | |
2611 | ||
2612 | The rate we are measuring is messages per period, suitable for directly | |
2613 | comparing with the limit. The average rate between now and the previous | |
2614 | message is period / interval, which we feed into the EWMA as the sample. | |
2615 | ||
2616 | It turns out that the number of messages required for the smoothed rate | |
2617 | to reach the limit when they are sent in a burst is equal to the limit. | |
2618 | This can be seen by analysing the value of the smoothed rate after N | |
2619 | messages sent at even intervals. Let k = (1 - a) * p/i | |
2620 | ||
2621 | rate_1 = (1 - a) * p/i + a * rate_0 | |
2622 | = k + a * rate_0 | |
2623 | rate_2 = k + a * rate_1 | |
2624 | = k + a * k + a^2 * rate_0 | |
2625 | rate_3 = k + a * k + a^2 * k + a^3 * rate_0 | |
2626 | rate_N = rate_0 * a^N + k * SUM(x=0..N-1)(a^x) | |
2627 | = rate_0 * a^N + k * (1 - a^N) / (1 - a) | |
2628 | = rate_0 * a^N + p/i * (1 - a^N) | |
2629 | ||
2630 | When N is large, a^N -> 0 so rate_N -> p/i as desired. | |
2631 | ||
2632 | rate_N = p/i + (rate_0 - p/i) * a^N | |
2633 | a^N = (rate_N - p/i) / (rate_0 - p/i) | |
2634 | N * -i/p = log((rate_N - p/i) / (rate_0 - p/i)) | |
2635 | N = p/i * log((rate_0 - p/i) / (rate_N - p/i)) | |
2636 | ||
2637 | Numerical analysis of the above equation, setting the computed rate to | |
2638 | increase from rate_0 = 0 to rate_N = limit, shows that for large sending | |
2639 | rates, p/i, the number of messages N = limit. So limit serves as both the | |
2640 | maximum rate measured in messages per period, and the maximum number of | |
2641 | messages that can be sent in a fast burst. */ | |
2642 | ||
2643 | double this_time = (double)tv.tv_sec | |
2644 | + (double)tv.tv_usec / 1000000.0; | |
2645 | double prev_time = (double)dbd->time_stamp | |
2646 | + (double)dbd->time_usec / 1000000.0; | |
870f6ba8 TF |
2647 | |
2648 | /* We must avoid division by zero, and deal gracefully with the clock going | |
2649 | backwards. If we blunder ahead when time is in reverse then the computed | |
e5d5a95f | 2650 | rate will be bogus. To be safe we clamp interval to a very small number. */ |
870f6ba8 | 2651 | |
e5d5a95f TF |
2652 | double interval = this_time - prev_time <= 0.0 ? 1e-9 |
2653 | : this_time - prev_time; | |
2654 | ||
2655 | double i_over_p = interval / period; | |
2656 | double a = exp(-i_over_p); | |
870f6ba8 | 2657 | |
c99ce5c9 TF |
2658 | /* Combine the instantaneous rate (period / interval) with the previous rate |
2659 | using the smoothing factor a. In order to measure sized events, multiply the | |
2660 | instantaneous rate by the count of bytes or recipients etc. */ | |
2661 | ||
870f6ba8 TF |
2662 | dbd->time_stamp = tv.tv_sec; |
2663 | dbd->time_usec = tv.tv_usec; | |
c99ce5c9 TF |
2664 | dbd->rate = (1 - a) * count / i_over_p + a * dbd->rate; |
2665 | ||
2666 | /* When events are very widely spaced the computed rate tends towards zero. | |
2667 | Although this is accurate it turns out not to be useful for our purposes, | |
2668 | especially when the first event after a long silence is the start of a spam | |
2669 | run. A more useful model is that the rate for an isolated event should be the | |
2670 | size of the event per the period size, ignoring the lack of events outside | |
2671 | the current period and regardless of where the event falls in the period. So, | |
2672 | if the interval was so long that the calculated rate is unhelpfully small, we | |
4c04137d | 2673 | re-initialize the rate. In the absence of higher-rate bursts, the condition |
c99ce5c9 TF |
2674 | below is true if the interval is greater than the period. */ |
2675 | ||
2676 | if (dbd->rate < count) dbd->rate = count; | |
870f6ba8 TF |
2677 | } |
2678 | ||
c99ce5c9 TF |
2679 | /* Clients sending at the limit are considered to be over the limit. |
2680 | This matters for edge cases such as a limit of zero, when the client | |
2681 | should be completely blocked. */ | |
3348576f | 2682 | |
8f240103 | 2683 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2684 | |
2685 | /* Update the state if the rate is low or if we are being strict. If we | |
2686 | are in leaky mode and the sender's rate is too high, we do not update | |
2687 | the recorded rate in order to avoid an over-aggressive sender's retry | |
c99ce5c9 TF |
2688 | rate preventing them from getting any email through. If readonly is set, |
2689 | neither leaky nor strict are set, so we do not do any updates. */ | |
870f6ba8 | 2690 | |
c99ce5c9 | 2691 | if ((rc == FAIL && leaky) || strict) |
8f240103 | 2692 | { |
c99ce5c9 | 2693 | dbfn_write(dbm, key, dbdb, dbdb_size); |
e1d04f48 | 2694 | HDEBUG(D_acl) debug_printf_indent("ratelimit db updated\n"); |
8f240103 PH |
2695 | } |
2696 | else | |
2697 | { | |
e1d04f48 | 2698 | HDEBUG(D_acl) debug_printf_indent("ratelimit db not updated: %s\n", |
c99ce5c9 | 2699 | readonly? "readonly mode" : "over the limit, but leaky"); |
8f240103 PH |
2700 | } |
2701 | ||
870f6ba8 TF |
2702 | dbfn_close(dbm); |
2703 | ||
c99ce5c9 | 2704 | /* Store the result in the tree for future reference. */ |
870f6ba8 | 2705 | |
c99ce5c9 TF |
2706 | t = store_get(sizeof(tree_node) + Ustrlen(key)); |
2707 | t->data.ptr = dbd; | |
2708 | Ustrcpy(t->name, key); | |
2709 | (void)tree_insertnode(anchor, t); | |
870f6ba8 TF |
2710 | |
2711 | /* We create the formatted version of the sender's rate very late in | |
2712 | order to ensure that it is done using the correct storage pool. */ | |
2713 | ||
2714 | store_pool = old_pool; | |
2715 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2716 | ||
2717 | HDEBUG(D_acl) | |
e1d04f48 | 2718 | debug_printf_indent("ratelimit computed rate %s\n", sender_rate); |
870f6ba8 TF |
2719 | |
2720 | return rc; | |
2721 | } | |
2722 | ||
2723 | ||
2724 | ||
b0019c78 TF |
2725 | /************************************************* |
2726 | * The udpsend ACL modifier * | |
2727 | *************************************************/ | |
2728 | ||
2729 | /* Called by acl_check_condition() below. | |
2730 | ||
2731 | Arguments: | |
2732 | arg the option string for udpsend= | |
2733 | log_msgptr for error messages | |
2734 | ||
2735 | Returns: OK - Completed. | |
2736 | DEFER - Problem with DNS lookup. | |
2737 | ERROR - Syntax error in options. | |
2738 | */ | |
2739 | ||
2740 | static int | |
55414b25 | 2741 | acl_udpsend(const uschar *arg, uschar **log_msgptr) |
b0019c78 TF |
2742 | { |
2743 | int sep = 0; | |
2744 | uschar *hostname; | |
2745 | uschar *portstr; | |
2746 | uschar *portend; | |
2747 | host_item *h; | |
2748 | int portnum; | |
b0019c78 TF |
2749 | int len; |
2750 | int r, s; | |
b1f8e4f8 | 2751 | uschar * errstr; |
b0019c78 TF |
2752 | |
2753 | hostname = string_nextinlist(&arg, &sep, NULL, 0); | |
2754 | portstr = string_nextinlist(&arg, &sep, NULL, 0); | |
2755 | ||
f5d25c2b | 2756 | if (!hostname) |
b0019c78 | 2757 | { |
217b0e56 | 2758 | *log_msgptr = US"missing destination host in \"udpsend\" modifier"; |
b0019c78 TF |
2759 | return ERROR; |
2760 | } | |
f5d25c2b | 2761 | if (!portstr) |
b0019c78 | 2762 | { |
217b0e56 | 2763 | *log_msgptr = US"missing destination port in \"udpsend\" modifier"; |
b0019c78 TF |
2764 | return ERROR; |
2765 | } | |
f5d25c2b | 2766 | if (!arg) |
b0019c78 | 2767 | { |
217b0e56 | 2768 | *log_msgptr = US"missing datagram payload in \"udpsend\" modifier"; |
b0019c78 TF |
2769 | return ERROR; |
2770 | } | |
2771 | portnum = Ustrtol(portstr, &portend, 10); | |
2772 | if (*portend != '\0') | |
2773 | { | |
217b0e56 | 2774 | *log_msgptr = US"bad destination port in \"udpsend\" modifier"; |
b0019c78 TF |
2775 | return ERROR; |
2776 | } | |
2777 | ||
2778 | /* Make a single-item host list. */ | |
2779 | h = store_get(sizeof(host_item)); | |
2780 | memset(h, 0, sizeof(host_item)); | |
2781 | h->name = hostname; | |
2782 | h->port = portnum; | |
2783 | h->mx = MX_NONE; | |
2784 | ||
2785 | if (string_is_ip_address(hostname, NULL)) | |
2786 | h->address = hostname, r = HOST_FOUND; | |
2787 | else | |
2788 | r = host_find_byname(h, NULL, 0, NULL, FALSE); | |
2789 | if (r == HOST_FIND_FAILED || r == HOST_FIND_AGAIN) | |
2790 | { | |
217b0e56 | 2791 | *log_msgptr = US"DNS lookup failed in \"udpsend\" modifier"; |
b0019c78 TF |
2792 | return DEFER; |
2793 | } | |
2794 | ||
2795 | HDEBUG(D_acl) | |
e1d04f48 | 2796 | debug_printf_indent("udpsend [%s]:%d %s\n", h->address, portnum, arg); |
b0019c78 | 2797 | |
4a5cbaff | 2798 | /*XXX this could better use sendto */ |
b1f8e4f8 | 2799 | r = s = ip_connectedsocket(SOCK_DGRAM, h->address, portnum, portnum, |
4a5cbaff | 2800 | 1, NULL, &errstr, NULL); |
b0019c78 | 2801 | if (r < 0) goto defer; |
27f9999e | 2802 | len = Ustrlen(arg); |
9cb1785a | 2803 | r = send(s, arg, len, 0); |
b1f8e4f8 JH |
2804 | if (r < 0) |
2805 | { | |
2806 | errstr = US strerror(errno); | |
2807 | close(s); | |
2808 | goto defer; | |
2809 | } | |
2810 | close(s); | |
b0019c78 TF |
2811 | if (r < len) |
2812 | { | |
2813 | *log_msgptr = | |
2814 | string_sprintf("\"udpsend\" truncated from %d to %d octets", len, r); | |
2815 | return DEFER; | |
2816 | } | |
2817 | ||
2818 | HDEBUG(D_acl) | |
e1d04f48 | 2819 | debug_printf_indent("udpsend %d bytes\n", r); |
b0019c78 TF |
2820 | |
2821 | return OK; | |
2822 | ||
2823 | defer: | |
b1f8e4f8 | 2824 | *log_msgptr = string_sprintf("\"udpsend\" failed: %s", errstr); |
b0019c78 TF |
2825 | return DEFER; |
2826 | } | |
2827 | ||
2828 | ||
2829 | ||
059ec3d9 PH |
2830 | /************************************************* |
2831 | * Handle conditions/modifiers on an ACL item * | |
2832 | *************************************************/ | |
2833 | ||
2834 | /* Called from acl_check() below. | |
2835 | ||
2836 | Arguments: | |
2837 | verb ACL verb | |
2838 | cb ACL condition block - if NULL, result is OK | |
2839 | where where called from | |
2840 | addr the address being checked for RCPT, or NULL | |
2841 | level the nesting level | |
2842 | epp pointer to pass back TRUE if "endpass" encountered | |
2843 | (applies only to "accept" and "discard") | |
2844 | user_msgptr user message pointer | |
2845 | log_msgptr log message pointer | |
2846 | basic_errno pointer to where to put verify error | |
2847 | ||
2848 | Returns: OK - all conditions are met | |
2849 | DISCARD - an "acl" condition returned DISCARD - only allowed | |
2850 | for "accept" or "discard" verbs | |
2851 | FAIL - at least one condition fails | |
2852 | FAIL_DROP - an "acl" condition returned FAIL_DROP | |
2853 | DEFER - can't tell at the moment (typically, lookup defer, | |
2854 | but can be temporary callout problem) | |
2855 | ERROR - ERROR from nested ACL or expansion failure or other | |
2856 | error | |
2857 | */ | |
2858 | ||
2859 | static int | |
2860 | acl_check_condition(int verb, acl_condition_block *cb, int where, | |
2861 | address_item *addr, int level, BOOL *epp, uschar **user_msgptr, | |
2862 | uschar **log_msgptr, int *basic_errno) | |
2863 | { | |
2864 | uschar *user_message = NULL; | |
2865 | uschar *log_message = NULL; | |
059ec3d9 | 2866 | int rc = OK; |
8523533c | 2867 | #ifdef WITH_CONTENT_SCAN |
0f0c8159 | 2868 | int sep = -'/'; |
8523533c | 2869 | #endif |
059ec3d9 PH |
2870 | |
2871 | for (; cb != NULL; cb = cb->next) | |
2872 | { | |
55414b25 | 2873 | const uschar *arg; |
8e669ac1 | 2874 | int control_type; |
059ec3d9 PH |
2875 | |
2876 | /* The message and log_message items set up messages to be used in | |
2877 | case of rejection. They are expanded later. */ | |
2878 | ||
2879 | if (cb->type == ACLC_MESSAGE) | |
2880 | { | |
e1d04f48 | 2881 | HDEBUG(D_acl) debug_printf_indent(" message: %s\n", cb->arg); |
059ec3d9 PH |
2882 | user_message = cb->arg; |
2883 | continue; | |
2884 | } | |
2885 | ||
2886 | if (cb->type == ACLC_LOG_MESSAGE) | |
2887 | { | |
e1d04f48 | 2888 | HDEBUG(D_acl) debug_printf_indent("l_message: %s\n", cb->arg); |
059ec3d9 PH |
2889 | log_message = cb->arg; |
2890 | continue; | |
2891 | } | |
2892 | ||
2893 | /* The endpass "condition" just sets a flag to show it occurred. This is | |
2894 | checked at compile time to be on an "accept" or "discard" item. */ | |
2895 | ||
2896 | if (cb->type == ACLC_ENDPASS) | |
2897 | { | |
2898 | *epp = TRUE; | |
2899 | continue; | |
2900 | } | |
2901 | ||
2902 | /* For other conditions and modifiers, the argument is expanded now for some | |
2903 | of them, but not for all, because expansion happens down in some lower level | |
2904 | checking functions in some cases. */ | |
2905 | ||
560e71cc JH |
2906 | if (!conditions[cb->type].expand_at_top) |
2907 | arg = cb->arg; | |
2908 | else if (!(arg = expand_string(cb->arg))) | |
059ec3d9 | 2909 | { |
560e71cc JH |
2910 | if (expand_string_forcedfail) continue; |
2911 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
2912 | cb->arg, expand_string_message); | |
2913 | return search_find_defer ? DEFER : ERROR; | |
059ec3d9 | 2914 | } |
059ec3d9 PH |
2915 | |
2916 | /* Show condition, and expanded condition if it's different */ | |
2917 | ||
2918 | HDEBUG(D_acl) | |
2919 | { | |
2920 | int lhswidth = 0; | |
e1d04f48 | 2921 | debug_printf_indent("check %s%s %n", |
2d009132 JH |
2922 | (!conditions[cb->type].is_modifier && cb->u.negated)? "!":"", |
2923 | conditions[cb->type].name, &lhswidth); | |
059ec3d9 PH |
2924 | |
2925 | if (cb->type == ACLC_SET) | |
2926 | { | |
a79d8834 JH |
2927 | #ifndef DISABLE_DKIM |
2928 | if ( Ustrcmp(cb->u.varname, "dkim_verify_status") == 0 | |
2929 | || Ustrcmp(cb->u.varname, "dkim_verify_reason") == 0) | |
2930 | { | |
2931 | debug_printf("%s ", cb->u.varname); | |
2932 | lhswidth += 19; | |
2933 | } | |
2934 | else | |
2935 | #endif | |
2936 | { | |
2937 | debug_printf("acl_%s ", cb->u.varname); | |
2938 | lhswidth += 5 + Ustrlen(cb->u.varname); | |
2939 | } | |
059ec3d9 PH |
2940 | } |
2941 | ||
2942 | debug_printf("= %s\n", cb->arg); | |
2943 | ||
2944 | if (arg != cb->arg) | |
2945 | debug_printf("%.*s= %s\n", lhswidth, | |
2946 | US" ", CS arg); | |
2947 | } | |
2948 | ||
2949 | /* Check that this condition makes sense at this time */ | |
2950 | ||
2d009132 | 2951 | if ((conditions[cb->type].forbids & (1 << where)) != 0) |
059ec3d9 PH |
2952 | { |
2953 | *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL", | |
2d009132 JH |
2954 | conditions[cb->type].is_modifier ? "use" : "test", |
2955 | conditions[cb->type].name, acl_wherenames[where]); | |
059ec3d9 PH |
2956 | return ERROR; |
2957 | } | |
2958 | ||
2959 | /* Run the appropriate test for each condition, or take the appropriate | |
2960 | action for the remaining modifiers. */ | |
2961 | ||
2962 | switch(cb->type) | |
2963 | { | |
71fafd95 PH |
2964 | case ACLC_ADD_HEADER: |
2965 | setup_header(arg); | |
2966 | break; | |
2967 | ||
059ec3d9 PH |
2968 | /* A nested ACL that returns "discard" makes sense only for an "accept" or |
2969 | "discard" verb. */ | |
71fafd95 | 2970 | |
059ec3d9 | 2971 | case ACLC_ACL: |
e1d04f48 | 2972 | rc = acl_check_wargs(where, addr, arg, user_msgptr, log_msgptr); |
7421ecab JH |
2973 | if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD) |
2974 | { | |
2975 | *log_msgptr = string_sprintf("nested ACL returned \"discard\" for " | |
2976 | "\"%s\" command (only allowed with \"accept\" or \"discard\")", | |
2977 | verbs[verb]); | |
2978 | return ERROR; | |
2979 | } | |
059ec3d9 PH |
2980 | break; |
2981 | ||
2982 | case ACLC_AUTHENTICATED: | |
c44ff8be JH |
2983 | rc = sender_host_authenticated ? match_isinlist(sender_host_authenticated, |
2984 | &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL) : FAIL; | |
059ec3d9 PH |
2985 | break; |
2986 | ||
71fafd95 | 2987 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
8523533c TK |
2988 | case ACLC_BMI_OPTIN: |
2989 | { | |
2990 | int old_pool = store_pool; | |
2991 | store_pool = POOL_PERM; | |
2992 | bmi_current_optin = string_copy(arg); | |
2993 | store_pool = old_pool; | |
2994 | } | |
2995 | break; | |
71fafd95 | 2996 | #endif |
8523533c | 2997 | |
059ec3d9 | 2998 | case ACLC_CONDITION: |
f3766eb5 NM |
2999 | /* The true/false parsing here should be kept in sync with that used in |
3000 | expand.c when dealing with ECOND_BOOL so that we don't have too many | |
3001 | different definitions of what can be a boolean. */ | |
51c7471d JH |
3002 | if (*arg == '-' |
3003 | ? Ustrspn(arg+1, "0123456789") == Ustrlen(arg+1) /* Negative number */ | |
3004 | : Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */ | |
059ec3d9 PH |
3005 | rc = (Uatoi(arg) == 0)? FAIL : OK; |
3006 | else | |
3007 | rc = (strcmpic(arg, US"no") == 0 || | |
3008 | strcmpic(arg, US"false") == 0)? FAIL : | |
3009 | (strcmpic(arg, US"yes") == 0 || | |
3010 | strcmpic(arg, US"true") == 0)? OK : DEFER; | |
3011 | if (rc == DEFER) | |
3012 | *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg); | |
3013 | break; | |
3014 | ||
c3611384 PH |
3015 | case ACLC_CONTINUE: /* Always succeeds */ |
3016 | break; | |
3017 | ||
059ec3d9 | 3018 | case ACLC_CONTROL: |
c5fcb476 | 3019 | { |
55414b25 JH |
3020 | const uschar *p = NULL; |
3021 | control_type = decode_control(arg, &p, where, log_msgptr); | |
4840604e | 3022 | |
55414b25 | 3023 | /* Check if this control makes sense at this time */ |
f7572e5a | 3024 | |
d7bed771 | 3025 | if (controls_list[control_type].forbids & (1 << where)) |
55414b25 JH |
3026 | { |
3027 | *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL", | |
d7bed771 | 3028 | controls_list[control_type].name, acl_wherenames[where]); |
55414b25 JH |
3029 | return ERROR; |
3030 | } | |
8800895a | 3031 | |
55414b25 JH |
3032 | switch(control_type) |
3033 | { | |
3034 | case CONTROL_AUTH_UNADVERTISED: | |
3035 | allow_auth_unadvertised = TRUE; | |
3036 | break; | |
3037 | ||
3038 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
3039 | case CONTROL_BMI_RUN: | |
3040 | bmi_run = 1; | |
3041 | break; | |
3042 | #endif | |
3043 | ||
3044 | #ifndef DISABLE_DKIM | |
3045 | case CONTROL_DKIM_VERIFY: | |
3046 | dkim_disable_verify = TRUE; | |
3047 | #ifdef EXPERIMENTAL_DMARC | |
3048 | /* Since DKIM was blocked, skip DMARC too */ | |
3049 | dmarc_disable_verify = TRUE; | |
3050 | dmarc_enable_forensic = FALSE; | |
3051 | #endif | |
3052 | break; | |
3053 | #endif | |
3054 | ||
3055 | #ifdef EXPERIMENTAL_DMARC | |
3056 | case CONTROL_DMARC_VERIFY: | |
3057 | dmarc_disable_verify = TRUE; | |
3058 | break; | |
3059 | ||
3060 | case CONTROL_DMARC_FORENSIC: | |
3061 | dmarc_enable_forensic = TRUE; | |
3062 | break; | |
3063 | #endif | |
3064 | ||
3065 | case CONTROL_DSCP: | |
3066 | if (*p == '/') | |
3067 | { | |
3068 | int fd, af, level, optname, value; | |
3069 | /* If we are acting on stdin, the setsockopt may fail if stdin is not | |
3070 | a socket; we can accept that, we'll just debug-log failures anyway. */ | |
3071 | fd = fileno(smtp_in); | |
3072 | af = ip_get_address_family(fd); | |
3073 | if (af < 0) | |
3074 | { | |
3075 | HDEBUG(D_acl) | |
e1d04f48 | 3076 | debug_printf_indent("smtp input is probably not a socket [%s], not setting DSCP\n", |
55414b25 JH |
3077 | strerror(errno)); |
3078 | break; | |
3079 | } | |
3080 | if (dscp_lookup(p+1, af, &level, &optname, &value)) | |
3081 | { | |
3082 | if (setsockopt(fd, level, optname, &value, sizeof(value)) < 0) | |
3083 | { | |
e1d04f48 | 3084 | HDEBUG(D_acl) debug_printf_indent("failed to set input DSCP[%s]: %s\n", |
55414b25 JH |
3085 | p+1, strerror(errno)); |
3086 | } | |
3087 | else | |
3088 | { | |
e1d04f48 | 3089 | HDEBUG(D_acl) debug_printf_indent("set input DSCP to \"%s\"\n", p+1); |
55414b25 JH |
3090 | } |
3091 | } | |
3092 | else | |
3093 | { | |
3094 | *log_msgptr = string_sprintf("unrecognised DSCP value in \"control=%s\"", arg); | |
3095 | return ERROR; | |
3096 | } | |
3097 | } | |
3098 | else | |
3099 | { | |
3100 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3101 | return ERROR; | |
3102 | } | |
3103 | break; | |
3104 | ||
3105 | case CONTROL_ERROR: | |
3106 | return ERROR; | |
3107 | ||
3108 | case CONTROL_CASEFUL_LOCAL_PART: | |
3109 | deliver_localpart = addr->cc_local_part; | |
3110 | break; | |
3111 | ||
3112 | case CONTROL_CASELOWER_LOCAL_PART: | |
3113 | deliver_localpart = addr->lc_local_part; | |
3114 | break; | |
3115 | ||
3116 | case CONTROL_ENFORCE_SYNC: | |
3117 | smtp_enforce_sync = TRUE; | |
3118 | break; | |
3119 | ||
3120 | case CONTROL_NO_ENFORCE_SYNC: | |
3121 | smtp_enforce_sync = FALSE; | |
3122 | break; | |
3123 | ||
3124 | #ifdef WITH_CONTENT_SCAN | |
3125 | case CONTROL_NO_MBOX_UNSPOOL: | |
3126 | no_mbox_unspool = TRUE; | |
3127 | break; | |
3128 | #endif | |
3129 | ||
3130 | case CONTROL_NO_MULTILINE: | |
3131 | no_multiline_responses = TRUE; | |
3132 | break; | |
3133 | ||
3134 | case CONTROL_NO_PIPELINING: | |
3135 | pipelining_enable = FALSE; | |
3136 | break; | |
3137 | ||
3138 | case CONTROL_NO_DELAY_FLUSH: | |
3139 | disable_delay_flush = TRUE; | |
3140 | break; | |
3141 | ||
3142 | case CONTROL_NO_CALLOUT_FLUSH: | |
3143 | disable_callout_flush = TRUE; | |
3144 | break; | |
3145 | ||
3146 | case CONTROL_FAKEREJECT: | |
57cc2785 | 3147 | cancel_cutthrough_connection(TRUE, US"fakereject"); |
55414b25 JH |
3148 | case CONTROL_FAKEDEFER: |
3149 | fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL; | |
3150 | if (*p == '/') | |
3151 | { | |
3152 | const uschar *pp = p + 1; | |
3153 | while (*pp != 0) pp++; | |
3154 | fake_response_text = expand_string(string_copyn(p+1, pp-p-1)); | |
3155 | p = pp; | |
3156 | } | |
3157 | else | |
3158 | { | |
3159 | /* Explicitly reset to default string */ | |
3160 | 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)."; | |
3161 | } | |
3162 | break; | |
ed7f7860 | 3163 | |
55414b25 JH |
3164 | case CONTROL_FREEZE: |
3165 | deliver_freeze = TRUE; | |
3166 | deliver_frozen_at = time(NULL); | |
3167 | freeze_tell = freeze_tell_config; /* Reset to configured value */ | |
3168 | if (Ustrncmp(p, "/no_tell", 8) == 0) | |
3169 | { | |
3170 | p += 8; | |
3171 | freeze_tell = NULL; | |
3172 | } | |
3173 | if (*p != 0) | |
3174 | { | |
3175 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3176 | return ERROR; | |
3177 | } | |
57cc2785 | 3178 | cancel_cutthrough_connection(TRUE, US"item frozen"); |
55414b25 JH |
3179 | break; |
3180 | ||
3181 | case CONTROL_QUEUE_ONLY: | |
3182 | queue_only_policy = TRUE; | |
57cc2785 | 3183 | cancel_cutthrough_connection(TRUE, US"queueing forced"); |
55414b25 JH |
3184 | break; |
3185 | ||
3186 | case CONTROL_SUBMISSION: | |
3187 | originator_name = US""; | |
3188 | submission_mode = TRUE; | |
3189 | while (*p == '/') | |
3190 | { | |
3191 | if (Ustrncmp(p, "/sender_retain", 14) == 0) | |
3192 | { | |
3193 | p += 14; | |
3194 | active_local_sender_retain = TRUE; | |
3195 | active_local_from_check = FALSE; | |
3196 | } | |
3197 | else if (Ustrncmp(p, "/domain=", 8) == 0) | |
3198 | { | |
3199 | const uschar *pp = p + 8; | |
3200 | while (*pp != 0 && *pp != '/') pp++; | |
3201 | submission_domain = string_copyn(p+8, pp-p-8); | |
3202 | p = pp; | |
3203 | } | |
3204 | /* The name= option must be last, because it swallows the rest of | |
3205 | the string. */ | |
3206 | else if (Ustrncmp(p, "/name=", 6) == 0) | |
3207 | { | |
3208 | const uschar *pp = p + 6; | |
3209 | while (*pp != 0) pp++; | |
3210 | submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6, | |
3211 | big_buffer, big_buffer_size)); | |
3212 | p = pp; | |
3213 | } | |
3214 | else break; | |
3215 | } | |
3216 | if (*p != 0) | |
3217 | { | |
3218 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3219 | return ERROR; | |
3220 | } | |
3221 | break; | |
e4bdf652 | 3222 | |
55414b25 | 3223 | case CONTROL_DEBUG: |
55414b25 | 3224 | { |
b0d68adc JH |
3225 | uschar * debug_tag = NULL; |
3226 | uschar * debug_opts = NULL; | |
3227 | BOOL kill = FALSE; | |
3228 | ||
3229 | while (*p == '/') | |
55414b25 | 3230 | { |
b0d68adc JH |
3231 | const uschar * pp = p+1; |
3232 | if (Ustrncmp(pp, "tag=", 4) == 0) | |
3233 | { | |
3234 | for (pp += 4; *pp && *pp != '/';) pp++; | |
3235 | debug_tag = string_copyn(p+5, pp-p-5); | |
3236 | } | |
3237 | else if (Ustrncmp(pp, "opts=", 5) == 0) | |
3238 | { | |
3239 | for (pp += 5; *pp && *pp != '/';) pp++; | |
3240 | debug_opts = string_copyn(p+6, pp-p-6); | |
3241 | } | |
3242 | else if (Ustrncmp(pp, "kill", 4) == 0) | |
3243 | { | |
3244 | for (pp += 4; *pp && *pp != '/';) pp++; | |
3245 | kill = TRUE; | |
3246 | } | |
3247 | else | |
3248 | while (*pp && *pp != '/') pp++; | |
55414b25 JH |
3249 | p = pp; |
3250 | } | |
b0d68adc JH |
3251 | |
3252 | if (kill) | |
3253 | debug_logging_stop(); | |
3254 | else | |
3255 | debug_logging_activate(debug_tag, debug_opts); | |
55414b25 | 3256 | } |
55414b25 JH |
3257 | break; |
3258 | ||
3259 | case CONTROL_SUPPRESS_LOCAL_FIXUPS: | |
3260 | suppress_local_fixups = TRUE; | |
3261 | break; | |
3262 | ||
3263 | case CONTROL_CUTTHROUGH_DELIVERY: | |
051d5efa JH |
3264 | { |
3265 | uschar * ignored = NULL; | |
a2b89db1 | 3266 | #ifndef DISABLE_PRDR |
55414b25 | 3267 | if (prdr_requested) |
a2b89db1 PP |
3268 | #else |
3269 | if (0) | |
3270 | #endif | |
55414b25 JH |
3271 | /* Too hard to think about for now. We might in future cutthrough |
3272 | the case where both sides handle prdr and this-node prdr acl | |
3273 | is "accept" */ | |
051d5efa | 3274 | ignored = US"PRDR active"; |
5032d1cf JH |
3275 | else |
3276 | { | |
55414b25 | 3277 | if (deliver_freeze) |
051d5efa | 3278 | ignored = US"frozen"; |
55414b25 | 3279 | else if (queue_only_policy) |
051d5efa | 3280 | ignored = US"queue-only"; |
55414b25 | 3281 | else if (fake_response == FAIL) |
051d5efa | 3282 | ignored = US"fakereject"; |
55414b25 JH |
3283 | else |
3284 | { | |
ff5929e3 JH |
3285 | if (rcpt_count == 1) |
3286 | { | |
051d5efa | 3287 | cutthrough.delivery = TRUE; /* control accepted */ |
ff5929e3 JH |
3288 | while (*p == '/') |
3289 | { | |
3290 | const uschar * pp = p+1; | |
3291 | if (Ustrncmp(pp, "defer=", 6) == 0) | |
3292 | { | |
3293 | pp += 6; | |
3294 | if (Ustrncmp(pp, "pass", 4) == 0) cutthrough.defer_pass = TRUE; | |
3295 | /* else if (Ustrncmp(pp, "spool") == 0) ; default */ | |
3296 | } | |
3297 | else | |
3298 | while (*pp && *pp != '/') pp++; | |
3299 | p = pp; | |
3300 | } | |
3301 | } | |
06fdb9f7 | 3302 | else |
051d5efa | 3303 | ignored = US"nonfirst rcpt"; |
55414b25 | 3304 | } |
5032d1cf | 3305 | } |
051d5efa JH |
3306 | DEBUG(D_acl) if (ignored) |
3307 | debug_printf(" cutthrough request ignored on %s item\n", ignored); | |
3308 | } | |
3309 | break; | |
3c8b3577 | 3310 | |
8c5d388a | 3311 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
3312 | case CONTROL_UTF8_DOWNCONVERT: |
3313 | if (*p == '/') | |
3314 | { | |
921dfc11 JH |
3315 | if (p[1] == '1') |
3316 | { | |
3317 | message_utf8_downconvert = 1; | |
3318 | addr->prop.utf8_downcvt = TRUE; | |
3319 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3320 | p += 2; | |
3321 | break; | |
3322 | } | |
3323 | if (p[1] == '0') | |
3324 | { | |
3325 | message_utf8_downconvert = 0; | |
3326 | addr->prop.utf8_downcvt = FALSE; | |
3327 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3328 | p += 2; | |
3329 | break; | |
3330 | } | |
3c8b3577 | 3331 | if (p[1] == '-' && p[2] == '1') |
921dfc11 JH |
3332 | { |
3333 | message_utf8_downconvert = -1; | |
3334 | addr->prop.utf8_downcvt = FALSE; | |
3335 | addr->prop.utf8_downcvt_maybe = TRUE; | |
3336 | p += 3; | |
3337 | break; | |
3338 | } | |
3c8b3577 JH |
3339 | *log_msgptr = US"bad option value for control=utf8_downconvert"; |
3340 | } | |
3341 | else | |
3342 | { | |
921dfc11 JH |
3343 | message_utf8_downconvert = 1; |
3344 | addr->prop.utf8_downcvt = TRUE; | |
3345 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3346 | break; | |
3c8b3577 JH |
3347 | } |
3348 | return ERROR; | |
8c5d388a | 3349 | #endif |
3c8b3577 | 3350 | |
9171d434 | 3351 | } |
55414b25 | 3352 | break; |
059ec3d9 | 3353 | } |
059ec3d9 | 3354 | |
6a8f9482 TK |
3355 | #ifdef EXPERIMENTAL_DCC |
3356 | case ACLC_DCC: | |
3357 | { | |
4c04137d | 3358 | /* Separate the regular expression and any optional parameters. */ |
55414b25 JH |
3359 | const uschar * list = arg; |
3360 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
6a8f9482 TK |
3361 | /* Run the dcc backend. */ |
3362 | rc = dcc_process(&ss); | |
4c04137d | 3363 | /* Modify return code based upon the existence of options. */ |
3c8b3577 | 3364 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) |
6a8f9482 | 3365 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) |
3c8b3577 | 3366 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ |
6a8f9482 TK |
3367 | } |
3368 | break; | |
3369 | #endif | |
3370 | ||
71fafd95 | 3371 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3372 | case ACLC_DECODE: |
3373 | rc = mime_decode(&arg); | |
3374 | break; | |
71fafd95 | 3375 | #endif |
8523533c | 3376 | |
059ec3d9 PH |
3377 | case ACLC_DELAY: |
3378 | { | |
3379 | int delay = readconf_readtime(arg, 0, FALSE); | |
3380 | if (delay < 0) | |
3381 | { | |
3382 | *log_msgptr = string_sprintf("syntax error in argument for \"delay\" " | |
3383 | "modifier: \"%s\" is not a time value", arg); | |
3384 | return ERROR; | |
3385 | } | |
3386 | else | |
3387 | { | |
e1d04f48 | 3388 | HDEBUG(D_acl) debug_printf_indent("delay modifier requests %d-second delay\n", |
059ec3d9 PH |
3389 | delay); |
3390 | if (host_checking) | |
3391 | { | |
3392 | HDEBUG(D_acl) | |
e1d04f48 | 3393 | debug_printf_indent("delay skipped in -bh checking mode\n"); |
059ec3d9 | 3394 | } |
010c2d14 | 3395 | |
ae9d18bc JH |
3396 | /* NOTE 1: Remember that we may be |
3397 | dealing with stdin/stdout here, in addition to TCP/IP connections. | |
3398 | Also, delays may be specified for non-SMTP input, where smtp_out and | |
3399 | smtp_in will be NULL. Whatever is done must work in all cases. | |
3400 | ||
3401 | NOTE 2: The added feature of flushing the output before a delay must | |
3402 | apply only to SMTP input. Hence the test for smtp_out being non-NULL. | |
3403 | */ | |
3404 | ||
3405 | else | |
3406 | { | |
3407 | if (smtp_out != NULL && !disable_delay_flush) | |
3408 | mac_smtp_fflush(); | |
3409 | ||
861a7c51 | 3410 | #if !defined(NO_POLL_H) && defined (POLLRDHUP) |
ae9d18bc JH |
3411 | { |
3412 | struct pollfd p; | |
3413 | nfds_t n = 0; | |
3414 | if (smtp_out) | |
3415 | { | |
3416 | p.fd = fileno(smtp_out); | |
3417 | p.events = POLLRDHUP; | |
3418 | n = 1; | |
3419 | } | |
3420 | if (poll(&p, n, delay*1000) > 0) | |
e1d04f48 | 3421 | HDEBUG(D_acl) debug_printf_indent("delay cancelled by peer close\n"); |
ae9d18bc JH |
3422 | } |
3423 | #else | |
010c2d14 PH |
3424 | /* It appears to be impossible to detect that a TCP/IP connection has |
3425 | gone away without reading from it. This means that we cannot shorten | |
3426 | the delay below if the client goes away, because we cannot discover | |
3427 | that the client has closed its end of the connection. (The connection | |
3428 | is actually in a half-closed state, waiting for the server to close its | |
3429 | end.) It would be nice to be able to detect this state, so that the | |
3430 | Exim process is not held up unnecessarily. However, it seems that we | |
3431 | can't. The poll() function does not do the right thing, and in any case | |
3432 | it is not always available. | |
047bdd8c | 3433 | */ |
010c2d14 | 3434 | |
86b8287f | 3435 | while (delay > 0) delay = sleep(delay); |
ae9d18bc | 3436 | #endif |
8e669ac1 | 3437 | } |
059ec3d9 PH |
3438 | } |
3439 | } | |
3440 | break; | |
3441 | ||
80a47a2c TK |
3442 | #ifndef DISABLE_DKIM |
3443 | case ACLC_DKIM_SIGNER: | |
a79d8834 | 3444 | if (dkim_cur_signer) |
9e5d6b55 | 3445 | rc = match_isinlist(dkim_cur_signer, |
80a47a2c | 3446 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); |
80a47a2c | 3447 | else |
b0b9dbb1 | 3448 | rc = FAIL; |
71fafd95 PH |
3449 | break; |
3450 | ||
80a47a2c | 3451 | case ACLC_DKIM_STATUS: |
a79d8834 | 3452 | rc = match_isinlist(dkim_verify_status, |
80a47a2c | 3453 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); |
71fafd95 PH |
3454 | break; |
3455 | #endif | |
fb2274d4 | 3456 | |
4840604e TL |
3457 | #ifdef EXPERIMENTAL_DMARC |
3458 | case ACLC_DMARC_STATUS: | |
4a8ce2d8 | 3459 | if (!dmarc_has_been_checked) |
4840604e | 3460 | dmarc_process(); |
4a8ce2d8 | 3461 | dmarc_has_been_checked = TRUE; |
4840604e TL |
3462 | /* used long way of dmarc_exim_expand_query() in case we need more |
3463 | * view into the process in the future. */ | |
3464 | rc = match_isinlist(dmarc_exim_expand_query(DMARC_VERIFY_STATUS), | |
3465 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); | |
3466 | break; | |
3467 | #endif | |
3468 | ||
059ec3d9 | 3469 | case ACLC_DNSLISTS: |
379ba7d0 | 3470 | rc = verify_check_dnsbl(where, &arg, log_msgptr); |
059ec3d9 PH |
3471 | break; |
3472 | ||
3473 | case ACLC_DOMAINS: | |
3474 | rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor, | |
55414b25 | 3475 | addr->domain_cache, MCL_DOMAIN, TRUE, CUSS &deliver_domain_data); |
059ec3d9 PH |
3476 | break; |
3477 | ||
3478 | /* The value in tls_cipher is the full cipher name, for example, | |
3479 | TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the | |
3480 | cipher names such as DES-CBC3-SHA. But program defensively. We don't know | |
3481 | what may in practice come out of the SSL library - which at the time of | |
3482 | writing is poorly documented. */ | |
3483 | ||
3484 | case ACLC_ENCRYPTED: | |
817d9f57 | 3485 | if (tls_in.cipher == NULL) rc = FAIL; else |
059ec3d9 PH |
3486 | { |
3487 | uschar *endcipher = NULL; | |
817d9f57 JH |
3488 | uschar *cipher = Ustrchr(tls_in.cipher, ':'); |
3489 | if (cipher == NULL) cipher = tls_in.cipher; else | |
059ec3d9 PH |
3490 | { |
3491 | endcipher = Ustrchr(++cipher, ':'); | |
3492 | if (endcipher != NULL) *endcipher = 0; | |
3493 | } | |
3494 | rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL); | |
3495 | if (endcipher != NULL) *endcipher = ':'; | |
3496 | } | |
3497 | break; | |
3498 | ||
3499 | /* Use verify_check_this_host() instead of verify_check_host() so that | |
3500 | we can pass over &host_data to catch any looked up data. Once it has been | |
3501 | set, it retains its value so that it's still there if another ACL verb | |
3502 | comes through here and uses the cache. However, we must put it into | |
3503 | permanent store in case it is also expected to be used in a subsequent | |
3504 | message in the same SMTP connection. */ | |
3505 | ||
3506 | case ACLC_HOSTS: | |
3507 | rc = verify_check_this_host(&arg, sender_host_cache, NULL, | |
55414b25 JH |
3508 | (sender_host_address == NULL)? US"" : sender_host_address, |
3509 | CUSS &host_data); | |
4a452c43 JH |
3510 | if (rc == DEFER) *log_msgptr = search_error_message; |
3511 | if (host_data) host_data = string_copy_malloc(host_data); | |
059ec3d9 PH |
3512 | break; |
3513 | ||
3514 | case ACLC_LOCAL_PARTS: | |
3515 | rc = match_isinlist(addr->cc_local_part, &arg, 0, | |
3516 | &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE, | |
55414b25 | 3517 | CUSS &deliver_localpart_data); |
059ec3d9 PH |
3518 | break; |
3519 | ||
6ea85e9a PH |
3520 | case ACLC_LOG_REJECT_TARGET: |
3521 | { | |
3522 | int logbits = 0; | |
3523 | int sep = 0; | |
55414b25 | 3524 | const uschar *s = arg; |
6ea85e9a | 3525 | uschar *ss; |
4a452c43 | 3526 | while ((ss = string_nextinlist(&s, &sep, big_buffer, big_buffer_size))) |
6ea85e9a PH |
3527 | { |
3528 | if (Ustrcmp(ss, "main") == 0) logbits |= LOG_MAIN; | |
3529 | else if (Ustrcmp(ss, "panic") == 0) logbits |= LOG_PANIC; | |
3530 | else if (Ustrcmp(ss, "reject") == 0) logbits |= LOG_REJECT; | |
3531 | else | |
3532 | { | |
3533 | logbits |= LOG_MAIN|LOG_REJECT; | |
3534 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown log name \"%s\" in " | |
3535 | "\"log_reject_target\" in %s ACL", ss, acl_wherenames[where]); | |
3536 | } | |
3537 | } | |
3538 | log_reject_target = logbits; | |
3539 | } | |
3540 | break; | |
3541 | ||
059ec3d9 PH |
3542 | case ACLC_LOGWRITE: |
3543 | { | |
3544 | int logbits = 0; | |
55414b25 | 3545 | const uschar *s = arg; |
059ec3d9 PH |
3546 | if (*s == ':') |
3547 | { | |
3548 | s++; | |
3549 | while (*s != ':') | |
3550 | { | |
3551 | if (Ustrncmp(s, "main", 4) == 0) | |
3552 | { logbits |= LOG_MAIN; s += 4; } | |
3553 | else if (Ustrncmp(s, "panic", 5) == 0) | |
3554 | { logbits |= LOG_PANIC; s += 5; } | |
3555 | else if (Ustrncmp(s, "reject", 6) == 0) | |
3556 | { logbits |= LOG_REJECT; s += 6; } | |
3557 | else | |
3558 | { | |
3559 | logbits = LOG_MAIN|LOG_PANIC; | |
3560 | s = string_sprintf(":unknown log name in \"%s\" in " | |
3561 | "\"logwrite\" in %s ACL", arg, acl_wherenames[where]); | |
3562 | } | |
3563 | if (*s == ',') s++; | |
3564 | } | |
3565 | s++; | |
3566 | } | |
3567 | while (isspace(*s)) s++; | |
6ea85e9a PH |
3568 | |
3569 | ||
059ec3d9 PH |
3570 | if (logbits == 0) logbits = LOG_MAIN; |
3571 | log_write(0, logbits, "%s", string_printing(s)); | |
3572 | } | |
3573 | break; | |
8e669ac1 | 3574 | |
71fafd95 | 3575 | #ifdef WITH_CONTENT_SCAN |
0f0c8159 | 3576 | case ACLC_MALWARE: /* Run the malware backend. */ |
8523533c | 3577 | { |
6ea85e9a | 3578 | /* Separate the regular expression and any optional parameters. */ |
55414b25 JH |
3579 | const uschar * list = arg; |
3580 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
0f0c8159 JH |
3581 | uschar *opt; |
3582 | BOOL defer_ok = FALSE; | |
3583 | int timeout = 0; | |
3584 | ||
55414b25 | 3585 | while ((opt = string_nextinlist(&list, &sep, NULL, 0))) |
0f0c8159 JH |
3586 | if (strcmpic(opt, US"defer_ok") == 0) |
3587 | defer_ok = TRUE; | |
3588 | else if ( strncmpic(opt, US"tmo=", 4) == 0 | |
3589 | && (timeout = readconf_readtime(opt+4, '\0', FALSE)) < 0 | |
3590 | ) | |
3591 | { | |
3592 | *log_msgptr = string_sprintf("bad timeout value in '%s'", opt); | |
3593 | return ERROR; | |
3594 | } | |
3595 | ||
3596 | rc = malware(ss, timeout); | |
3597 | if (rc == DEFER && defer_ok) | |
3598 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ | |
8523533c TK |
3599 | } |
3600 | break; | |
3601 | ||
3602 | case ACLC_MIME_REGEX: | |
71fafd95 | 3603 | rc = mime_regex(&arg); |
8523533c | 3604 | break; |
71fafd95 | 3605 | #endif |
059ec3d9 | 3606 | |
b0b9dbb1 | 3607 | case ACLC_QUEUE: |
944e8b37 JH |
3608 | if (Ustrchr(arg, '/')) |
3609 | { | |
3610 | *log_msgptr = string_sprintf( | |
3611 | "Directory separator not permitted in queue name: '%s'", arg); | |
3612 | return ERROR; | |
3613 | } | |
b0b9dbb1 JH |
3614 | queue_name = string_copy_malloc(arg); |
3615 | break; | |
3616 | ||
870f6ba8 | 3617 | case ACLC_RATELIMIT: |
90fc3069 | 3618 | rc = acl_ratelimit(arg, where, log_msgptr); |
870f6ba8 TF |
3619 | break; |
3620 | ||
059ec3d9 | 3621 | case ACLC_RECIPIENTS: |
36d295f1 | 3622 | rc = match_address_list(CUS addr->address, TRUE, TRUE, &arg, NULL, -1, 0, |
55414b25 | 3623 | CUSS &recipient_data); |
059ec3d9 PH |
3624 | break; |
3625 | ||
71fafd95 PH |
3626 | #ifdef WITH_CONTENT_SCAN |
3627 | case ACLC_REGEX: | |
3628 | rc = regex(&arg); | |
8523533c | 3629 | break; |
71fafd95 | 3630 | #endif |
8523533c | 3631 | |
e7568d51 TL |
3632 | case ACLC_REMOVE_HEADER: |
3633 | setup_remove_header(arg); | |
3634 | break; | |
3635 | ||
059ec3d9 PH |
3636 | case ACLC_SENDER_DOMAINS: |
3637 | { | |
3638 | uschar *sdomain; | |
3639 | sdomain = Ustrrchr(sender_address, '@'); | |
f7ae7462 | 3640 | sdomain = sdomain ? sdomain + 1 : US""; |
059ec3d9 PH |
3641 | rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor, |
3642 | sender_domain_cache, MCL_DOMAIN, TRUE, NULL); | |
3643 | } | |
3644 | break; | |
3645 | ||
3646 | case ACLC_SENDERS: | |
36d295f1 | 3647 | rc = match_address_list(CUS sender_address, TRUE, TRUE, &arg, |
55414b25 | 3648 | sender_address_cache, -1, 0, CUSS &sender_data); |
059ec3d9 PH |
3649 | break; |
3650 | ||
3651 | /* Connection variables must persist forever */ | |
3652 | ||
3653 | case ACLC_SET: | |
3654 | { | |
3655 | int old_pool = store_pool; | |
5ef5dd52 | 3656 | if ( cb->u.varname[0] == 'c' |
a79d8834 JH |
3657 | #ifndef DISABLE_DKIM |
3658 | || cb->u.varname[0] == 'd' | |
3659 | #endif | |
0cbf2b82 | 3660 | #ifndef DISABLE_EVENT |
5ef5dd52 JB |
3661 | || event_name /* An event is being delivered */ |
3662 | #endif | |
3663 | ) | |
3664 | store_pool = POOL_PERM; | |
a79d8834 JH |
3665 | #ifndef DISABLE_DKIM /* Overwriteable dkim result variables */ |
3666 | if (Ustrcmp(cb->u.varname, "dkim_verify_status") == 0) | |
3667 | dkim_verify_status = string_copy(arg); | |
3668 | else if (Ustrcmp(cb->u.varname, "dkim_verify_reason") == 0) | |
3669 | dkim_verify_reason = string_copy(arg); | |
3670 | else | |
3671 | #endif | |
3672 | acl_var_create(cb->u.varname)->data.ptr = string_copy(arg); | |
059ec3d9 PH |
3673 | store_pool = old_pool; |
3674 | } | |
3675 | break; | |
3676 | ||
eb52e2cb | 3677 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3678 | case ACLC_SPAM: |
3679 | { | |
4c04137d | 3680 | /* Separate the regular expression and any optional parameters. */ |
55414b25 JH |
3681 | const uschar * list = arg; |
3682 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
eb52e2cb | 3683 | |
55414b25 | 3684 | rc = spam(CUSS &ss); |
4c04137d | 3685 | /* Modify return code based upon the existence of options. */ |
eb52e2cb | 3686 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) |
8523533c | 3687 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) |
eb52e2cb | 3688 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ |
8523533c TK |
3689 | } |
3690 | break; | |
eb52e2cb | 3691 | #endif |
8523533c | 3692 | |
7952eef9 | 3693 | #ifdef SUPPORT_SPF |
8523533c | 3694 | case ACLC_SPF: |
65a7d8c3 NM |
3695 | rc = spf_process(&arg, sender_address, SPF_PROCESS_NORMAL); |
3696 | break; | |
3697 | case ACLC_SPF_GUESS: | |
3698 | rc = spf_process(&arg, sender_address, SPF_PROCESS_GUESS); | |
8523533c | 3699 | break; |
eb52e2cb | 3700 | #endif |
8523533c | 3701 | |
b0019c78 TF |
3702 | case ACLC_UDPSEND: |
3703 | rc = acl_udpsend(arg, log_msgptr); | |
3704 | break; | |
3705 | ||
059ec3d9 PH |
3706 | /* If the verb is WARN, discard any user message from verification, because |
3707 | such messages are SMTP responses, not header additions. The latter come | |
475fe28a PH |
3708 | only from explicit "message" modifiers. However, put the user message into |
3709 | $acl_verify_message so it can be used in subsequent conditions or modifiers | |
3710 | (until something changes it). */ | |
059ec3d9 PH |
3711 | |
3712 | case ACLC_VERIFY: | |
3713 | rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno); | |
3703d818 JH |
3714 | if (*user_msgptr) |
3715 | acl_verify_message = *user_msgptr; | |
059ec3d9 PH |
3716 | if (verb == ACL_WARN) *user_msgptr = NULL; |
3717 | break; | |
3718 | ||
3719 | default: | |
3720 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown " | |
3721 | "condition %d", cb->type); | |
3722 | break; | |
3723 | } | |
3724 | ||
3725 | /* If a condition was negated, invert OK/FAIL. */ | |
3726 | ||
2d009132 | 3727 | if (!conditions[cb->type].is_modifier && cb->u.negated) |
059ec3d9 | 3728 | if (rc == OK) rc = FAIL; |
2d009132 | 3729 | else if (rc == FAIL || rc == FAIL_DROP) rc = OK; |
059ec3d9 PH |
3730 | |
3731 | if (rc != OK) break; /* Conditions loop */ | |
3732 | } | |
3733 | ||
3734 | ||
3735 | /* If the result is the one for which "message" and/or "log_message" are used, | |
4e88a19f PH |
3736 | handle the values of these modifiers. If there isn't a log message set, we make |
3737 | it the same as the user message. | |
059ec3d9 PH |
3738 | |
3739 | "message" is a user message that will be included in an SMTP response. Unless | |
3740 | it is empty, it overrides any previously set user message. | |
3741 | ||
3742 | "log_message" is a non-user message, and it adds to any existing non-user | |
3743 | message that is already set. | |
3744 | ||
4e88a19f PH |
3745 | Most verbs have but a single return for which the messages are relevant, but |
3746 | for "discard", it's useful to have the log message both when it succeeds and | |
3747 | when it fails. For "accept", the message is used in the OK case if there is no | |
3748 | "endpass", but (for backwards compatibility) in the FAIL case if "endpass" is | |
3749 | present. */ | |
059ec3d9 | 3750 | |
4e88a19f PH |
3751 | if (*epp && rc == OK) user_message = NULL; |
3752 | ||
e3a69b62 | 3753 | if ((BIT(rc) & msgcond[verb]) != 0) |
059ec3d9 PH |
3754 | { |
3755 | uschar *expmessage; | |
4e88a19f PH |
3756 | uschar *old_user_msgptr = *user_msgptr; |
3757 | uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr; | |
059ec3d9 PH |
3758 | |
3759 | /* If the verb is "warn", messages generated by conditions (verification or | |
4e88a19f PH |
3760 | nested ACLs) are always discarded. This also happens for acceptance verbs |
3761 | when they actually do accept. Only messages specified at this level are used. | |
059ec3d9 PH |
3762 | However, the value of an existing message is available in $acl_verify_message |
3763 | during expansions. */ | |
3764 | ||
4e88a19f PH |
3765 | if (verb == ACL_WARN || |
3766 | (rc == OK && (verb == ACL_ACCEPT || verb == ACL_DISCARD))) | |
3767 | *log_msgptr = *user_msgptr = NULL; | |
059ec3d9 | 3768 | |
e3a69b62 | 3769 | if (user_message) |
059ec3d9 PH |
3770 | { |
3771 | acl_verify_message = old_user_msgptr; | |
3772 | expmessage = expand_string(user_message); | |
e3a69b62 | 3773 | if (!expmessage) |
059ec3d9 PH |
3774 | { |
3775 | if (!expand_string_forcedfail) | |
3776 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3777 | user_message, expand_string_message); | |
3778 | } | |
3779 | else if (expmessage[0] != 0) *user_msgptr = expmessage; | |
3780 | } | |
3781 | ||
e3a69b62 | 3782 | if (log_message) |
059ec3d9 PH |
3783 | { |
3784 | acl_verify_message = old_log_msgptr; | |
3785 | expmessage = expand_string(log_message); | |
e3a69b62 | 3786 | if (!expmessage) |
059ec3d9 PH |
3787 | { |
3788 | if (!expand_string_forcedfail) | |
3789 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3790 | log_message, expand_string_message); | |
3791 | } | |
3792 | else if (expmessage[0] != 0) | |
3793 | { | |
3794 | *log_msgptr = (*log_msgptr == NULL)? expmessage : | |
3795 | string_sprintf("%s: %s", expmessage, *log_msgptr); | |
3796 | } | |
3797 | } | |
3798 | ||
3799 | /* If no log message, default it to the user message */ | |
3800 | ||
e3a69b62 | 3801 | if (!*log_msgptr) *log_msgptr = *user_msgptr; |
059ec3d9 PH |
3802 | } |
3803 | ||
3804 | acl_verify_message = NULL; | |
3805 | return rc; | |
3806 | } | |
3807 | ||
3808 | ||
3809 | ||
3810 | ||
3811 | ||
3812 | /************************************************* | |
3813 | * Get line from a literal ACL * | |
3814 | *************************************************/ | |
3815 | ||
3816 | /* This function is passed to acl_read() in order to extract individual lines | |
3817 | of a literal ACL, which we access via static pointers. We can destroy the | |
3818 | contents because this is called only once (the compiled ACL is remembered). | |
3819 | ||
3820 | This code is intended to treat the data in the same way as lines in the main | |
3821 | Exim configuration file. That is: | |
3822 | ||
3823 | . Leading spaces are ignored. | |
3824 | ||
3825 | . A \ at the end of a line is a continuation - trailing spaces after the \ | |
3826 | are permitted (this is because I don't believe in making invisible things | |
3827 | significant). Leading spaces on the continued part of a line are ignored. | |
3828 | ||
3829 | . Physical lines starting (significantly) with # are totally ignored, and | |
3830 | may appear within a sequence of backslash-continued lines. | |
3831 | ||
3832 | . Blank lines are ignored, but will end a sequence of continuations. | |
3833 | ||
3834 | Arguments: none | |
3835 | Returns: a pointer to the next line | |
3836 | */ | |
3837 | ||
3838 | ||
3839 | static uschar *acl_text; /* Current pointer in the text */ | |
3840 | static uschar *acl_text_end; /* Points one past the terminating '0' */ | |
3841 | ||
3842 | ||
3843 | static uschar * | |
3844 | acl_getline(void) | |
3845 | { | |
3846 | uschar *yield; | |
3847 | ||
3848 | /* This loop handles leading blank lines and comments. */ | |
3849 | ||
3850 | for(;;) | |
3851 | { | |
3852 | while (isspace(*acl_text)) acl_text++; /* Leading spaces/empty lines */ | |
3853 | if (*acl_text == 0) return NULL; /* No more data */ | |
3854 | yield = acl_text; /* Potential data line */ | |
3855 | ||
3856 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3857 | ||
3858 | /* If we hit the end before a newline, we have the whole logical line. If | |
3859 | it's a comment, there's no more data to be given. Otherwise, yield it. */ | |
3860 | ||
3861 | if (*acl_text == 0) return (*yield == '#')? NULL : yield; | |
3862 | ||
3863 | /* After reaching a newline, end this loop if the physical line does not | |
3864 | start with '#'. If it does, it's a comment, and the loop continues. */ | |
3865 | ||
3866 | if (*yield != '#') break; | |
3867 | } | |
3868 | ||
3869 | /* This loop handles continuations. We know we have some real data, ending in | |
3870 | newline. See if there is a continuation marker at the end (ignoring trailing | |
3871 | white space). We know that *yield is not white space, so no need to test for | |
3872 | cont > yield in the backwards scanning loop. */ | |
3873 | ||
3874 | for(;;) | |
3875 | { | |
3876 | uschar *cont; | |
3877 | for (cont = acl_text - 1; isspace(*cont); cont--); | |
3878 | ||
3879 | /* If no continuation follows, we are done. Mark the end of the line and | |
3880 | return it. */ | |
3881 | ||
3882 | if (*cont != '\\') | |
3883 | { | |
3884 | *acl_text++ = 0; | |
3885 | return yield; | |
3886 | } | |
3887 | ||
3888 | /* We have encountered a continuation. Skip over whitespace at the start of | |
3889 | the next line, and indeed the whole of the next line or lines if they are | |
3890 | comment lines. */ | |
3891 | ||
3892 | for (;;) | |
3893 | { | |
3894 | while (*(++acl_text) == ' ' || *acl_text == '\t'); | |
3895 | if (*acl_text != '#') break; | |
3896 | while (*(++acl_text) != 0 && *acl_text != '\n'); | |
3897 | } | |
3898 | ||
3899 | /* We have the start of a continuation line. Move all the rest of the data | |
3900 | to join onto the previous line, and then find its end. If the end is not a | |
3901 | newline, we are done. Otherwise loop to look for another continuation. */ | |
3902 | ||
3903 | memmove(cont, acl_text, acl_text_end - acl_text); | |
3904 | acl_text_end -= acl_text - cont; | |
3905 | acl_text = cont; | |
3906 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3907 | if (*acl_text == 0) return yield; | |
3908 | } | |
3909 | ||
3910 | /* Control does not reach here */ | |
3911 | } | |
3912 | ||
3913 | ||
3914 | ||
3915 | ||
3916 | ||
3917 | /************************************************* | |
3918 | * Check access using an ACL * | |
3919 | *************************************************/ | |
3920 | ||
3921 | /* This function is called from address_check. It may recurse via | |
3922 | acl_check_condition() - hence the use of a level to stop looping. The ACL is | |
3923 | passed as a string which is expanded. A forced failure implies no access check | |
3924 | is required. If the result is a single word, it is taken as the name of an ACL | |
3925 | which is sought in the global ACL tree. Otherwise, it is taken as literal ACL | |
3926 | text, complete with newlines, and parsed as such. In both cases, the ACL check | |
3927 | is then run. This function uses an auxiliary function for acl_read() to call | |
3928 | for reading individual lines of a literal ACL. This is acl_getline(), which | |
3929 | appears immediately above. | |
3930 | ||
3931 | Arguments: | |
3932 | where where called from | |
3933 | addr address item when called from RCPT; otherwise NULL | |
3934 | s the input string; NULL is the same as an empty ACL => DENY | |
059ec3d9 PH |
3935 | user_msgptr where to put a user error (for SMTP response) |
3936 | log_msgptr where to put a logging message (not for SMTP response) | |
3937 | ||
3938 | Returns: OK access is granted | |
3939 | DISCARD access is apparently granted... | |
3940 | FAIL access is denied | |
3941 | FAIL_DROP access is denied; drop the connection | |
3942 | DEFER can't tell at the moment | |
3943 | ERROR disaster | |
3944 | */ | |
3945 | ||
3946 | static int | |
e1d04f48 | 3947 | acl_check_internal(int where, address_item *addr, uschar *s, |
059ec3d9 PH |
3948 | uschar **user_msgptr, uschar **log_msgptr) |
3949 | { | |
3950 | int fd = -1; | |
3951 | acl_block *acl = NULL; | |
3952 | uschar *acl_name = US"inline ACL"; | |
3953 | uschar *ss; | |
3954 | ||
3955 | /* Catch configuration loops */ | |
3956 | ||
e1d04f48 | 3957 | if (acl_level > 20) |
059ec3d9 PH |
3958 | { |
3959 | *log_msgptr = US"ACL nested too deep: possible loop"; | |
3960 | return ERROR; | |
3961 | } | |
3962 | ||
e1d04f48 | 3963 | if (!s) |
059ec3d9 | 3964 | { |
e1d04f48 | 3965 | HDEBUG(D_acl) debug_printf_indent("ACL is NULL: implicit DENY\n"); |
059ec3d9 PH |
3966 | return FAIL; |
3967 | } | |
3968 | ||
3969 | /* At top level, we expand the incoming string. At lower levels, it has already | |
3970 | been expanded as part of condition processing. */ | |
3971 | ||
e1d04f48 | 3972 | if (acl_level == 0) |
059ec3d9 | 3973 | { |
e1d04f48 | 3974 | if (!(ss = expand_string(s))) |
059ec3d9 PH |
3975 | { |
3976 | if (expand_string_forcedfail) return OK; | |
3977 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s, | |
3978 | expand_string_message); | |
3979 | return ERROR; | |
3980 | } | |
3981 | } | |
3982 | else ss = s; | |
3983 | ||
bb07bcd3 | 3984 | while (isspace(*ss)) ss++; |
059ec3d9 PH |
3985 | |
3986 | /* If we can't find a named ACL, the default is to parse it as an inline one. | |
3987 | (Unless it begins with a slash; non-existent files give rise to an error.) */ | |
3988 | ||
3989 | acl_text = ss; | |
3990 | ||
3991 | /* Handle the case of a string that does not contain any spaces. Look for a | |
3992 | named ACL among those read from the configuration, or a previously read file. | |
3993 | It is possible that the pointer to the ACL is NULL if the configuration | |
3994 | contains a name with no data. If not found, and the text begins with '/', | |
3995 | read an ACL from a file, and save it so it can be re-used. */ | |
3996 | ||
3997 | if (Ustrchr(ss, ' ') == NULL) | |
3998 | { | |
3999 | tree_node *t = tree_search(acl_anchor, ss); | |
4000 | if (t != NULL) | |
4001 | { | |
4002 | acl = (acl_block *)(t->data.ptr); | |
4003 | if (acl == NULL) | |
4004 | { | |
e1d04f48 | 4005 | HDEBUG(D_acl) debug_printf_indent("ACL \"%s\" is empty: implicit DENY\n", ss); |
059ec3d9 PH |
4006 | return FAIL; |
4007 | } | |
4008 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
e1d04f48 | 4009 | HDEBUG(D_acl) debug_printf_indent("using ACL \"%s\"\n", ss); |
059ec3d9 PH |
4010 | } |
4011 | ||
4012 | else if (*ss == '/') | |
4013 | { | |
4014 | struct stat statbuf; | |
4015 | fd = Uopen(ss, O_RDONLY, 0); | |
4016 | if (fd < 0) | |
4017 | { | |
4018 | *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss, | |
4019 | strerror(errno)); | |
4020 | return ERROR; | |
4021 | } | |
4022 | ||
4023 | if (fstat(fd, &statbuf) != 0) | |
4024 | { | |
4025 | *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss, | |
4026 | strerror(errno)); | |
4027 | return ERROR; | |
4028 | } | |
4029 | ||
4030 | acl_text = store_get(statbuf.st_size + 1); | |
4031 | acl_text_end = acl_text + statbuf.st_size + 1; | |
4032 | ||
4033 | if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size) | |
4034 | { | |
4035 | *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s", | |
4036 | ss, strerror(errno)); | |
4037 | return ERROR; | |
4038 | } | |
4039 | acl_text[statbuf.st_size] = 0; | |
f1e894f3 | 4040 | (void)close(fd); |
059ec3d9 PH |
4041 | |
4042 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
e1d04f48 | 4043 | HDEBUG(D_acl) debug_printf_indent("read ACL from file %s\n", ss); |
059ec3d9 PH |
4044 | } |
4045 | } | |
4046 | ||
4047 | /* Parse an ACL that is still in text form. If it came from a file, remember it | |
4048 | in the ACL tree, having read it into the POOL_PERM store pool so that it | |
4049 | persists between multiple messages. */ | |
4050 | ||
4051 | if (acl == NULL) | |
4052 | { | |
4053 | int old_pool = store_pool; | |
4054 | if (fd >= 0) store_pool = POOL_PERM; | |
4055 | acl = acl_read(acl_getline, log_msgptr); | |
4056 | store_pool = old_pool; | |
4057 | if (acl == NULL && *log_msgptr != NULL) return ERROR; | |
4058 | if (fd >= 0) | |
4059 | { | |
4060 | tree_node *t = store_get_perm(sizeof(tree_node) + Ustrlen(ss)); | |
4061 | Ustrcpy(t->name, ss); | |
4062 | t->data.ptr = acl; | |
4063 | (void)tree_insertnode(&acl_anchor, t); | |
4064 | } | |
4065 | } | |
4066 | ||
4067 | /* Now we have an ACL to use. It's possible it may be NULL. */ | |
4068 | ||
4069 | while (acl != NULL) | |
4070 | { | |
4071 | int cond; | |
4072 | int basic_errno = 0; | |
4073 | BOOL endpass_seen = FALSE; | |
e1d04f48 | 4074 | BOOL acl_quit_check = acl_level == 0 |
82c0c8ea | 4075 | && (where == ACL_WHERE_QUIT || where == ACL_WHERE_NOTQUIT); |
059ec3d9 PH |
4076 | |
4077 | *log_msgptr = *user_msgptr = NULL; | |
4078 | acl_temp_details = FALSE; | |
4079 | ||
e1d04f48 | 4080 | HDEBUG(D_acl) debug_printf_indent("processing \"%s\"\n", verbs[acl->verb]); |
059ec3d9 PH |
4081 | |
4082 | /* Clear out any search error message from a previous check before testing | |
4083 | this condition. */ | |
4084 | ||
4085 | search_error_message = NULL; | |
e1d04f48 | 4086 | cond = acl_check_condition(acl->verb, acl->condition, where, addr, acl_level, |
059ec3d9 PH |
4087 | &endpass_seen, user_msgptr, log_msgptr, &basic_errno); |
4088 | ||
4089 | /* Handle special returns: DEFER causes a return except on a WARN verb; | |
4090 | ERROR always causes a return. */ | |
4091 | ||
4092 | switch (cond) | |
4093 | { | |
4094 | case DEFER: | |
e1d04f48 | 4095 | HDEBUG(D_acl) debug_printf_indent("%s: condition test deferred in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4096 | if (basic_errno != ERRNO_CALLOUTDEFER) |
4097 | { | |
4098 | if (search_error_message != NULL && *search_error_message != 0) | |
4099 | *log_msgptr = search_error_message; | |
4100 | if (smtp_return_error_details) acl_temp_details = TRUE; | |
4101 | } | |
4102 | else | |
4103 | { | |
4104 | acl_temp_details = TRUE; | |
4105 | } | |
4106 | if (acl->verb != ACL_WARN) return DEFER; | |
4107 | break; | |
4108 | ||
4109 | default: /* Paranoia */ | |
4110 | case ERROR: | |
e1d04f48 | 4111 | HDEBUG(D_acl) debug_printf_indent("%s: condition test error in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4112 | return ERROR; |
4113 | ||
4114 | case OK: | |
e1d04f48 | 4115 | HDEBUG(D_acl) debug_printf_indent("%s: condition test succeeded in %s\n", |
6968512f | 4116 | verbs[acl->verb], acl_name); |
059ec3d9 PH |
4117 | break; |
4118 | ||
4119 | case FAIL: | |
e1d04f48 | 4120 | HDEBUG(D_acl) debug_printf_indent("%s: condition test failed in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4121 | break; |
4122 | ||
4123 | /* DISCARD and DROP can happen only from a nested ACL condition, and | |
4124 | DISCARD can happen only for an "accept" or "discard" verb. */ | |
4125 | ||
4126 | case DISCARD: | |
e1d04f48 | 4127 | HDEBUG(D_acl) debug_printf_indent("%s: condition test yielded \"discard\" in %s\n", |
6968512f | 4128 | verbs[acl->verb], acl_name); |
059ec3d9 PH |
4129 | break; |
4130 | ||
4131 | case FAIL_DROP: | |
e1d04f48 | 4132 | HDEBUG(D_acl) debug_printf_indent("%s: condition test yielded \"drop\" in %s\n", |
6968512f | 4133 | verbs[acl->verb], acl_name); |
059ec3d9 PH |
4134 | break; |
4135 | } | |
4136 | ||
4137 | /* At this point, cond for most verbs is either OK or FAIL or (as a result of | |
4138 | a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and | |
4139 | for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */ | |
4140 | ||
4141 | switch(acl->verb) | |
4142 | { | |
4143 | case ACL_ACCEPT: | |
a7538db1 JH |
4144 | if (cond == OK || cond == DISCARD) |
4145 | { | |
e1d04f48 | 4146 | HDEBUG(D_acl) debug_printf_indent("end of %s: ACCEPT\n", acl_name); |
a7538db1 JH |
4147 | return cond; |
4148 | } | |
059ec3d9 PH |
4149 | if (endpass_seen) |
4150 | { | |
e1d04f48 | 4151 | HDEBUG(D_acl) debug_printf_indent("accept: endpass encountered - denying access\n"); |
059ec3d9 PH |
4152 | return cond; |
4153 | } | |
4154 | break; | |
4155 | ||
4156 | case ACL_DEFER: | |
4157 | if (cond == OK) | |
4158 | { | |
e1d04f48 | 4159 | HDEBUG(D_acl) debug_printf_indent("end of %s: DEFER\n", acl_name); |
82c0c8ea | 4160 | if (acl_quit_check) goto badquit; |
059ec3d9 PH |
4161 | acl_temp_details = TRUE; |
4162 | return DEFER; | |
4163 | } | |
4164 | break; | |
4165 | ||
4166 | case ACL_DENY: | |
a7538db1 JH |
4167 | if (cond == OK) |
4168 | { | |
e1d04f48 | 4169 | HDEBUG(D_acl) debug_printf_indent("end of %s: DENY\n", acl_name); |
82c0c8ea | 4170 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4171 | return FAIL; |
4172 | } | |
059ec3d9 PH |
4173 | break; |
4174 | ||
4175 | case ACL_DISCARD: | |
a7538db1 JH |
4176 | if (cond == OK || cond == DISCARD) |
4177 | { | |
e1d04f48 | 4178 | HDEBUG(D_acl) debug_printf_indent("end of %s: DISCARD\n", acl_name); |
82c0c8ea | 4179 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4180 | return DISCARD; |
4181 | } | |
059ec3d9 PH |
4182 | if (endpass_seen) |
4183 | { | |
e1d04f48 | 4184 | HDEBUG(D_acl) debug_printf_indent("discard: endpass encountered - denying access\n"); |
059ec3d9 PH |
4185 | return cond; |
4186 | } | |
4187 | break; | |
4188 | ||
4189 | case ACL_DROP: | |
a7538db1 JH |
4190 | if (cond == OK) |
4191 | { | |
e1d04f48 | 4192 | HDEBUG(D_acl) debug_printf_indent("end of %s: DROP\n", acl_name); |
82c0c8ea | 4193 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4194 | return FAIL_DROP; |
4195 | } | |
059ec3d9 PH |
4196 | break; |
4197 | ||
4198 | case ACL_REQUIRE: | |
a7538db1 JH |
4199 | if (cond != OK) |
4200 | { | |
e1d04f48 | 4201 | HDEBUG(D_acl) debug_printf_indent("end of %s: not OK\n", acl_name); |
82c0c8ea | 4202 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4203 | return cond; |
4204 | } | |
059ec3d9 PH |
4205 | break; |
4206 | ||
4207 | case ACL_WARN: | |
4208 | if (cond == OK) | |
4209 | acl_warn(where, *user_msgptr, *log_msgptr); | |
6c6d6e48 | 4210 | else if (cond == DEFER && LOGGING(acl_warn_skipped)) |
9c7a242c PH |
4211 | log_write(0, LOG_MAIN, "%s Warning: ACL \"warn\" statement skipped: " |
4212 | "condition test deferred%s%s", host_and_ident(TRUE), | |
4213 | (*log_msgptr == NULL)? US"" : US": ", | |
4214 | (*log_msgptr == NULL)? US"" : *log_msgptr); | |
059ec3d9 PH |
4215 | *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */ |
4216 | break; | |
4217 | ||
4218 | default: | |
4219 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d", | |
4220 | acl->verb); | |
4221 | break; | |
4222 | } | |
4223 | ||
4224 | /* Pass to the next ACL item */ | |
4225 | ||
4226 | acl = acl->next; | |
4227 | } | |
4228 | ||
4229 | /* We have reached the end of the ACL. This is an implicit DENY. */ | |
4230 | ||
e1d04f48 | 4231 | HDEBUG(D_acl) debug_printf_indent("end of %s: implicit DENY\n", acl_name); |
059ec3d9 | 4232 | return FAIL; |
82c0c8ea JH |
4233 | |
4234 | badquit: | |
4c04137d | 4235 | *log_msgptr = string_sprintf("QUIT or not-QUIT toplevel ACL may not fail " |
82c0c8ea JH |
4236 | "('%s' verb used incorrectly)", verbs[acl->verb]); |
4237 | return ERROR; | |
059ec3d9 PH |
4238 | } |
4239 | ||
4240 | ||
333eea9c JH |
4241 | |
4242 | ||
4243 | /* Same args as acl_check_internal() above, but the string s is | |
4244 | the name of an ACL followed optionally by up to 9 space-separated arguments. | |
4245 | The name and args are separately expanded. Args go into $acl_arg globals. */ | |
f60d98e8 | 4246 | static int |
e1d04f48 | 4247 | acl_check_wargs(int where, address_item *addr, const uschar *s, |
333eea9c JH |
4248 | uschar **user_msgptr, uschar **log_msgptr) |
4249 | { | |
4250 | uschar * tmp; | |
bef3ea7f | 4251 | uschar * tmp_arg[9]; /* must match acl_arg[] */ |
ef21c07d JH |
4252 | uschar * sav_arg[9]; /* must match acl_arg[] */ |
4253 | int sav_narg; | |
333eea9c | 4254 | uschar * name; |
bef3ea7f | 4255 | int i; |
ef21c07d | 4256 | int ret; |
333eea9c JH |
4257 | |
4258 | if (!(tmp = string_dequote(&s)) || !(name = expand_string(tmp))) | |
4259 | goto bad; | |
4260 | ||
bef3ea7f | 4261 | for (i = 0; i < 9; i++) |
333eea9c JH |
4262 | { |
4263 | while (*s && isspace(*s)) s++; | |
4264 | if (!*s) break; | |
bef3ea7f | 4265 | if (!(tmp = string_dequote(&s)) || !(tmp_arg[i] = expand_string(tmp))) |
333eea9c JH |
4266 | { |
4267 | tmp = name; | |
4268 | goto bad; | |
4269 | } | |
4270 | } | |
ef21c07d JH |
4271 | |
4272 | sav_narg = acl_narg; | |
bef3ea7f | 4273 | acl_narg = i; |
ef21c07d JH |
4274 | for (i = 0; i < acl_narg; i++) |
4275 | { | |
4276 | sav_arg[i] = acl_arg[i]; | |
4277 | acl_arg[i] = tmp_arg[i]; | |
4278 | } | |
4279 | while (i < 9) | |
4280 | { | |
4281 | sav_arg[i] = acl_arg[i]; | |
4282 | acl_arg[i++] = NULL; | |
4283 | } | |
4284 | ||
e1d04f48 JH |
4285 | acl_level++; |
4286 | ret = acl_check_internal(where, addr, name, user_msgptr, log_msgptr); | |
4287 | acl_level--; | |
333eea9c | 4288 | |
ef21c07d JH |
4289 | acl_narg = sav_narg; |
4290 | for (i = 0; i < 9; i++) acl_arg[i] = sav_arg[i]; | |
4291 | return ret; | |
333eea9c JH |
4292 | |
4293 | bad: | |
4294 | if (expand_string_forcedfail) return ERROR; | |
4295 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
4296 | tmp, expand_string_message); | |
4297 | return search_find_defer?DEFER:ERROR; | |
4298 | } | |
4299 | ||
4300 | ||
4301 | ||
059ec3d9 PH |
4302 | /************************************************* |
4303 | * Check access using an ACL * | |
4304 | *************************************************/ | |
4305 | ||
faa05a93 JH |
4306 | /* Alternate interface for ACL, used by expansions */ |
4307 | int | |
05caaeaa | 4308 | acl_eval(int where, uschar *s, uschar **user_msgptr, uschar **log_msgptr) |
faa05a93 | 4309 | { |
faa05a93 JH |
4310 | address_item adb; |
4311 | address_item *addr = NULL; | |
e1d04f48 | 4312 | int rc; |
faa05a93 JH |
4313 | |
4314 | *user_msgptr = *log_msgptr = NULL; | |
4315 | sender_verified_failed = NULL; | |
4316 | ratelimiters_cmd = NULL; | |
4317 | log_reject_target = LOG_MAIN|LOG_REJECT; | |
4318 | ||
4319 | if (where == ACL_WHERE_RCPT) | |
4320 | { | |
4321 | adb = address_defaults; | |
4322 | addr = &adb; | |
05caaeaa JH |
4323 | addr->address = expand_string(US"$local_part@$domain"); |
4324 | addr->domain = deliver_domain; | |
4325 | addr->local_part = deliver_localpart; | |
4326 | addr->cc_local_part = deliver_localpart; | |
4327 | addr->lc_local_part = deliver_localpart; | |
faa05a93 JH |
4328 | } |
4329 | ||
e1d04f48 JH |
4330 | acl_level++; |
4331 | rc = acl_check_internal(where, addr, s, user_msgptr, log_msgptr); | |
4332 | acl_level--; | |
4333 | return rc; | |
faa05a93 JH |
4334 | } |
4335 | ||
4336 | ||
4337 | ||
059ec3d9 PH |
4338 | /* This is the external interface for ACL checks. It sets up an address and the |
4339 | expansions for $domain and $local_part when called after RCPT, then calls | |
4340 | acl_check_internal() to do the actual work. | |
4341 | ||
4342 | Arguments: | |
4343 | where ACL_WHERE_xxxx indicating where called from | |
64ffc24f | 4344 | recipient RCPT address for RCPT check, else NULL |
059ec3d9 PH |
4345 | s the input string; NULL is the same as an empty ACL => DENY |
4346 | user_msgptr where to put a user error (for SMTP response) | |
4347 | log_msgptr where to put a logging message (not for SMTP response) | |
4348 | ||
4349 | Returns: OK access is granted by an ACCEPT verb | |
4350 | DISCARD access is granted by a DISCARD verb | |
4351 | FAIL access is denied | |
4352 | FAIL_DROP access is denied; drop the connection | |
4353 | DEFER can't tell at the moment | |
4354 | ERROR disaster | |
4355 | */ | |
faa05a93 | 4356 | int acl_where = ACL_WHERE_UNKNOWN; |
059ec3d9 PH |
4357 | |
4358 | int | |
64ffc24f | 4359 | acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr, |
059ec3d9 PH |
4360 | uschar **log_msgptr) |
4361 | { | |
4362 | int rc; | |
4363 | address_item adb; | |
64ffc24f | 4364 | address_item *addr = NULL; |
059ec3d9 PH |
4365 | |
4366 | *user_msgptr = *log_msgptr = NULL; | |
4367 | sender_verified_failed = NULL; | |
fe0dab11 | 4368 | ratelimiters_cmd = NULL; |
6ea85e9a | 4369 | log_reject_target = LOG_MAIN|LOG_REJECT; |
059ec3d9 | 4370 | |
8ccd00b1 | 4371 | #ifndef DISABLE_PRDR |
4f6ae5c3 | 4372 | if (where==ACL_WHERE_RCPT || where==ACL_WHERE_VRFY || where==ACL_WHERE_PRDR) |
fd98a5c6 | 4373 | #else |
4f6ae5c3 | 4374 | if (where==ACL_WHERE_RCPT || where==ACL_WHERE_VRFY) |
fd98a5c6 | 4375 | #endif |
059ec3d9 PH |
4376 | { |
4377 | adb = address_defaults; | |
4378 | addr = &adb; | |
64ffc24f | 4379 | addr->address = recipient; |
059ec3d9 PH |
4380 | if (deliver_split_address(addr) == DEFER) |
4381 | { | |
4382 | *log_msgptr = US"defer in percent_hack_domains check"; | |
4383 | return DEFER; | |
4384 | } | |
8c5d388a | 4385 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
4386 | if ((addr->prop.utf8_msg = message_smtputf8)) |
4387 | { | |
4388 | addr->prop.utf8_downcvt = message_utf8_downconvert == 1; | |
4389 | addr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1; | |
4390 | } | |
9bfc60eb | 4391 | #endif |
059ec3d9 PH |
4392 | deliver_domain = addr->domain; |
4393 | deliver_localpart = addr->local_part; | |
4394 | } | |
059ec3d9 | 4395 | |
faa05a93 | 4396 | acl_where = where; |
e1d04f48 JH |
4397 | acl_level = 0; |
4398 | rc = acl_check_internal(where, addr, s, user_msgptr, log_msgptr); | |
4399 | acl_level = 0; | |
faa05a93 | 4400 | acl_where = ACL_WHERE_UNKNOWN; |
059ec3d9 | 4401 | |
817d9f57 JH |
4402 | /* Cutthrough - if requested, |
4403 | and WHERE_RCPT and not yet opened conn as result of recipient-verify, | |
4404 | and rcpt acl returned accept, | |
4405 | and first recipient (cancel on any subsequents) | |
e4bdf652 | 4406 | open one now and run it up to RCPT acceptance. |
f9334a28 JH |
4407 | A failed verify should cancel cutthrough request, |
4408 | and will pass the fail to the originator. | |
817d9f57 | 4409 | Initial implementation: dual-write to spool. |
e4bdf652 JH |
4410 | Assume the rxd datastream is now being copied byte-for-byte to an open cutthrough connection. |
4411 | ||
4412 | Cease cutthrough copy on rxd final dot; do not send one. | |
4413 | ||
4414 | On a data acl, if not accept and a cutthrough conn is open, hard-close it (no SMTP niceness). | |
4415 | ||
4416 | On data acl accept, terminate the dataphase on an open cutthrough conn. If accepted or | |
4417 | perm-rejected, reflect that to the original sender - and dump the spooled copy. | |
4418 | If temp-reject, close the conn (and keep the spooled copy). | |
4419 | If conn-failure, no action (and keep the spooled copy). | |
e4bdf652 JH |
4420 | */ |
4421 | switch (where) | |
ff5929e3 JH |
4422 | { |
4423 | case ACL_WHERE_RCPT: | |
8ccd00b1 | 4424 | #ifndef DISABLE_PRDR |
ff5929e3 | 4425 | case ACL_WHERE_PRDR: |
fd98a5c6 | 4426 | #endif |
57cc2785 | 4427 | |
ff5929e3 | 4428 | if (host_checking_callout) /* -bhc mode */ |
57cc2785 | 4429 | cancel_cutthrough_connection(TRUE, US"host-checking mode"); |
ff5929e3 JH |
4430 | |
4431 | else if ( rc == OK | |
4432 | && cutthrough.delivery | |
4433 | && rcpt_count > cutthrough.nrcpt | |
ff5929e3 | 4434 | ) |
06fdb9f7 JH |
4435 | { |
4436 | if ((rc = open_cutthrough_connection(addr)) == DEFER) | |
4437 | if (cutthrough.defer_pass) | |
4438 | { | |
4439 | uschar * s = addr->message; | |
4440 | /* Horrid kludge to recover target's SMTP message */ | |
4441 | while (*s) s++; | |
4442 | do --s; while (!isdigit(*s)); | |
4443 | if (*--s && isdigit(*s) && *--s && isdigit(*s)) *user_msgptr = s; | |
4444 | acl_temp_details = TRUE; | |
4445 | } | |
4446 | else | |
4447 | { | |
4448 | HDEBUG(D_acl) debug_printf_indent("cutthrough defer; will spool\n"); | |
4449 | rc = OK; | |
4450 | } | |
4451 | } | |
4452 | else HDEBUG(D_acl) if (cutthrough.delivery) | |
4453 | if (rcpt_count <= cutthrough.nrcpt) | |
4454 | debug_printf_indent("ignore cutthrough request; nonfirst message\n"); | |
4455 | else if (rc != OK) | |
4456 | debug_printf_indent("ignore cutthrough request; ACL did not accept\n"); | |
ff5929e3 | 4457 | break; |
e4bdf652 | 4458 | |
ff5929e3 JH |
4459 | case ACL_WHERE_PREDATA: |
4460 | if (rc == OK) | |
4461 | cutthrough_predata(); | |
4462 | else | |
57cc2785 | 4463 | cancel_cutthrough_connection(TRUE, US"predata acl not ok"); |
ff5929e3 | 4464 | break; |
e4bdf652 | 4465 | |
ff5929e3 JH |
4466 | case ACL_WHERE_QUIT: |
4467 | case ACL_WHERE_NOTQUIT: | |
57cc2785 JH |
4468 | /* Drop cutthrough conns, and drop heldopen verify conns if |
4469 | the previous was not DATA */ | |
4470 | { | |
4471 | uschar prev = smtp_connection_had[smtp_ch_index-2]; | |
4472 | BOOL dropverify = !(prev == SCH_DATA || prev == SCH_BDAT); | |
4473 | ||
4474 | cancel_cutthrough_connection(dropverify, US"quit or conndrop"); | |
ff5929e3 | 4475 | break; |
57cc2785 | 4476 | } |
e4bdf652 | 4477 | |
ff5929e3 JH |
4478 | default: |
4479 | break; | |
4480 | } | |
e4bdf652 | 4481 | |
64ffc24f PH |
4482 | deliver_domain = deliver_localpart = deliver_address_data = |
4483 | sender_address_data = NULL; | |
059ec3d9 PH |
4484 | |
4485 | /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA | |
4486 | ACL, which is really in the middle of an SMTP command. */ | |
4487 | ||
4488 | if (rc == DISCARD) | |
4489 | { | |
4490 | if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA) | |
4491 | { | |
4492 | log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s " | |
4493 | "ACL", acl_wherenames[where]); | |
4494 | return ERROR; | |
4495 | } | |
4496 | return DISCARD; | |
4497 | } | |
4498 | ||
4499 | /* A DROP response is not permitted from MAILAUTH */ | |
4500 | ||
4501 | if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH) | |
4502 | { | |
4503 | log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s " | |
4504 | "ACL", acl_wherenames[where]); | |
4505 | return ERROR; | |
4506 | } | |
4507 | ||
4e88a19f PH |
4508 | /* Before giving a response, take a look at the length of any user message, and |
4509 | split it up into multiple lines if possible. */ | |
059ec3d9 | 4510 | |
e28326d8 PH |
4511 | *user_msgptr = string_split_message(*user_msgptr); |
4512 | if (fake_response != OK) | |
4513 | fake_response_text = string_split_message(fake_response_text); | |
059ec3d9 PH |
4514 | |
4515 | return rc; | |
4516 | } | |
4517 | ||
38a0a95f | 4518 | |
38a0a95f PH |
4519 | /************************************************* |
4520 | * Create ACL variable * | |
4521 | *************************************************/ | |
4522 | ||
4523 | /* Create an ACL variable or reuse an existing one. ACL variables are in a | |
4524 | binary tree (see tree.c) with acl_var_c and acl_var_m as root nodes. | |
4525 | ||
4526 | Argument: | |
4527 | name pointer to the variable's name, starting with c or m | |
4528 | ||
4529 | Returns the pointer to variable's tree node | |
4530 | */ | |
4531 | ||
4532 | tree_node * | |
2c0f3ea1 | 4533 | acl_var_create(uschar * name) |
38a0a95f | 4534 | { |
2c0f3ea1 JH |
4535 | tree_node * node, ** root = name[0] == 'c' ? &acl_var_c : &acl_var_m; |
4536 | if (!(node = tree_search(*root, name))) | |
38a0a95f PH |
4537 | { |
4538 | node = store_get(sizeof(tree_node) + Ustrlen(name)); | |
4539 | Ustrcpy(node->name, name); | |
4540 | (void)tree_insertnode(root, node); | |
4541 | } | |
4542 | node->data.ptr = NULL; | |
4543 | return node; | |
4544 | } | |
4545 | ||
4546 | ||
4547 | ||
4548 | /************************************************* | |
4549 | * Write an ACL variable in spool format * | |
4550 | *************************************************/ | |
4551 | ||
4552 | /* This function is used as a callback for tree_walk when writing variables to | |
4553 | the spool file. To retain spool file compatibility, what is written is -aclc or | |
4554 | -aclm followed by the rest of the name and the data length, space separated, | |
4555 | then the value itself, starting on a new line, and terminated by an additional | |
4556 | newline. When we had only numbered ACL variables, the first line might look | |
4557 | like this: "-aclc 5 20". Now it might be "-aclc foo 20" for the variable called | |
4558 | acl_cfoo. | |
4559 | ||
4560 | Arguments: | |
4561 | name of the variable | |
4562 | value of the variable | |
4563 | ctx FILE pointer (as a void pointer) | |
4564 | ||
4565 | Returns: nothing | |
4566 | */ | |
4567 | ||
4568 | void | |
4569 | acl_var_write(uschar *name, uschar *value, void *ctx) | |
4570 | { | |
4571 | FILE *f = (FILE *)ctx; | |
4572 | fprintf(f, "-acl%c %s %d\n%s\n", name[0], name+1, Ustrlen(value), value); | |
4573 | } | |
4574 | ||
9171d434 JH |
4575 | /* vi: aw ai sw=2 |
4576 | */ | |
059ec3d9 | 4577 | /* End of acl.c */ |