Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
9242a7e8 | 5 | /* Copyright (c) University of Cambridge 1995 - 2017 */ |
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] = |
d7bed771 | 526 | { US"utf8_downconvert", TRUE, 0 } |
3c8b3577 | 527 | #endif |
d7bed771 | 528 | }; |
059ec3d9 | 529 | |
e5a9dba6 PH |
530 | /* Support data structures for Client SMTP Authorization. acl_verify_csa() |
531 | caches its result in a tree to avoid repeated DNS queries. The result is an | |
532 | integer code which is used as an index into the following tables of | |
533 | explanatory strings and verification return codes. */ | |
534 | ||
535 | static tree_node *csa_cache = NULL; | |
536 | ||
537 | enum { CSA_UNKNOWN, CSA_OK, CSA_DEFER_SRV, CSA_DEFER_ADDR, | |
538 | CSA_FAIL_EXPLICIT, CSA_FAIL_DOMAIN, CSA_FAIL_NOADDR, CSA_FAIL_MISMATCH }; | |
539 | ||
540 | /* The acl_verify_csa() return code is translated into an acl_verify() return | |
541 | code using the following table. It is OK unless the client is definitely not | |
542 | authorized. This is because CSA is supposed to be optional for sending sites, | |
543 | so recipients should not be too strict about checking it - especially because | |
544 | DNS problems are quite likely to occur. It's possible to use $csa_status in | |
545 | further ACL conditions to distinguish ok, unknown, and defer if required, but | |
546 | the aim is to make the usual configuration simple. */ | |
547 | ||
548 | static int csa_return_code[] = { | |
f2ed27cf JH |
549 | [CSA_UNKNOWN] = OK, |
550 | [CSA_OK] = OK, | |
551 | [CSA_DEFER_SRV] = OK, | |
552 | [CSA_DEFER_ADDR] = OK, | |
553 | [CSA_FAIL_EXPLICIT] = FAIL, | |
554 | [CSA_FAIL_DOMAIN] = FAIL, | |
555 | [CSA_FAIL_NOADDR] = FAIL, | |
556 | [CSA_FAIL_MISMATCH] = FAIL | |
e5a9dba6 PH |
557 | }; |
558 | ||
559 | static uschar *csa_status_string[] = { | |
f2ed27cf JH |
560 | [CSA_UNKNOWN] = US"unknown", |
561 | [CSA_OK] = US"ok", | |
562 | [CSA_DEFER_SRV] = US"defer", | |
563 | [CSA_DEFER_ADDR] = US"defer", | |
564 | [CSA_FAIL_EXPLICIT] = US"fail", | |
565 | [CSA_FAIL_DOMAIN] = US"fail", | |
566 | [CSA_FAIL_NOADDR] = US"fail", | |
567 | [CSA_FAIL_MISMATCH] = US"fail" | |
e5a9dba6 PH |
568 | }; |
569 | ||
570 | static uschar *csa_reason_string[] = { | |
f2ed27cf JH |
571 | [CSA_UNKNOWN] = US"unknown", |
572 | [CSA_OK] = US"ok", | |
573 | [CSA_DEFER_SRV] = US"deferred (SRV lookup failed)", | |
574 | [CSA_DEFER_ADDR] = US"deferred (target address lookup failed)", | |
575 | [CSA_FAIL_EXPLICIT] = US"failed (explicit authorization required)", | |
576 | [CSA_FAIL_DOMAIN] = US"failed (host name not authorized)", | |
577 | [CSA_FAIL_NOADDR] = US"failed (no authorized addresses)", | |
578 | [CSA_FAIL_MISMATCH] = US"failed (client address mismatch)" | |
e5a9dba6 PH |
579 | }; |
580 | ||
c99ce5c9 TF |
581 | /* Options for the ratelimit condition. Note that there are two variants of |
582 | the per_rcpt option, depending on the ACL that is used to measure the rate. | |
583 | However any ACL must be able to look up per_rcpt rates in /noupdate mode, | |
584 | so the two variants must have the same internal representation as well as | |
585 | the same configuration string. */ | |
586 | ||
587 | enum { | |
588 | RATE_PER_WHAT, RATE_PER_CLASH, RATE_PER_ADDR, RATE_PER_BYTE, RATE_PER_CMD, | |
589 | RATE_PER_CONN, RATE_PER_MAIL, RATE_PER_RCPT, RATE_PER_ALLRCPTS | |
590 | }; | |
591 | ||
592 | #define RATE_SET(var,new) \ | |
593 | (((var) == RATE_PER_WHAT) ? ((var) = RATE_##new) : ((var) = RATE_PER_CLASH)) | |
594 | ||
595 | static uschar *ratelimit_option_string[] = { | |
f2ed27cf JH |
596 | [RATE_PER_WHAT] = US"?", |
597 | [RATE_PER_CLASH] = US"!", | |
598 | [RATE_PER_ADDR] = US"per_addr", | |
599 | [RATE_PER_BYTE] = US"per_byte", | |
600 | [RATE_PER_CMD] = US"per_cmd", | |
601 | [RATE_PER_CONN] = US"per_conn", | |
602 | [RATE_PER_MAIL] = US"per_mail", | |
603 | [RATE_PER_RCPT] = US"per_rcpt", | |
604 | [RATE_PER_ALLRCPTS] = US"per_rcpt" | |
c99ce5c9 TF |
605 | }; |
606 | ||
059ec3d9 PH |
607 | /* Enable recursion between acl_check_internal() and acl_check_condition() */ |
608 | ||
e1d04f48 | 609 | static int acl_check_wargs(int, address_item *, const uschar *, uschar **, |
f60d98e8 | 610 | uschar **); |
059ec3d9 PH |
611 | |
612 | ||
d7bed771 JH |
613 | /************************************************* |
614 | * Find control in list * | |
615 | *************************************************/ | |
616 | ||
617 | /* The lists are always in order, so binary chop can be used. | |
618 | ||
619 | Arguments: | |
620 | name the control name to search for | |
621 | ol the first entry in the control list | |
622 | last one more than the offset of the last entry in the control list | |
623 | ||
624 | Returns: index of a control entry, or -1 if not found | |
625 | */ | |
626 | ||
627 | static int | |
628 | find_control(const uschar * name, control_def * ol, int last) | |
629 | { | |
630 | int first = 0; | |
631 | while (last > first) | |
632 | { | |
633 | int middle = (first + last)/2; | |
634 | uschar * s = ol[middle].name; | |
635 | int c = Ustrncmp(name, s, Ustrlen(s)); | |
636 | if (c == 0) return middle; | |
637 | else if (c > 0) first = middle + 1; | |
638 | else last = middle; | |
639 | } | |
640 | return -1; | |
641 | } | |
642 | ||
643 | ||
644 | ||
2d009132 JH |
645 | /************************************************* |
646 | * Pick out condition from list * | |
647 | *************************************************/ | |
648 | ||
649 | /* Use a binary chop method | |
650 | ||
651 | Arguments: | |
652 | name name to find | |
653 | list list of conditions | |
654 | end size of list | |
655 | ||
656 | Returns: offset in list, or -1 if not found | |
657 | */ | |
658 | ||
659 | static int | |
660 | acl_checkcondition(uschar * name, condition_def * list, int end) | |
661 | { | |
662 | int start = 0; | |
663 | while (start < end) | |
664 | { | |
665 | int mid = (start + end)/2; | |
666 | int c = Ustrcmp(name, list[mid].name); | |
667 | if (c == 0) return mid; | |
668 | if (c < 0) end = mid; | |
669 | else start = mid + 1; | |
670 | } | |
671 | return -1; | |
672 | } | |
673 | ||
674 | ||
059ec3d9 PH |
675 | /************************************************* |
676 | * Pick out name from list * | |
677 | *************************************************/ | |
678 | ||
679 | /* Use a binary chop method | |
680 | ||
681 | Arguments: | |
682 | name name to find | |
683 | list list of names | |
684 | end size of list | |
685 | ||
686 | Returns: offset in list, or -1 if not found | |
687 | */ | |
688 | ||
689 | static int | |
690 | acl_checkname(uschar *name, uschar **list, int end) | |
691 | { | |
692 | int start = 0; | |
693 | ||
694 | while (start < end) | |
695 | { | |
696 | int mid = (start + end)/2; | |
697 | int c = Ustrcmp(name, list[mid]); | |
698 | if (c == 0) return mid; | |
699 | if (c < 0) end = mid; else start = mid + 1; | |
700 | } | |
701 | ||
702 | return -1; | |
703 | } | |
704 | ||
705 | ||
706 | /************************************************* | |
707 | * Read and parse one ACL * | |
708 | *************************************************/ | |
709 | ||
710 | /* This function is called both from readconf in order to parse the ACLs in the | |
711 | configuration file, and also when an ACL is encountered dynamically (e.g. as | |
712 | the result of an expansion). It is given a function to call in order to | |
713 | retrieve the lines of the ACL. This function handles skipping comments and | |
714 | blank lines (where relevant). | |
715 | ||
716 | Arguments: | |
717 | func function to get next line of ACL | |
718 | error where to put an error message | |
719 | ||
720 | Returns: pointer to ACL, or NULL | |
721 | NULL can be legal (empty ACL); in this case error will be NULL | |
722 | */ | |
723 | ||
724 | acl_block * | |
725 | acl_read(uschar *(*func)(void), uschar **error) | |
726 | { | |
727 | acl_block *yield = NULL; | |
728 | acl_block **lastp = &yield; | |
729 | acl_block *this = NULL; | |
730 | acl_condition_block *cond; | |
731 | acl_condition_block **condp = NULL; | |
732 | uschar *s; | |
733 | ||
734 | *error = NULL; | |
735 | ||
736 | while ((s = (*func)()) != NULL) | |
737 | { | |
738 | int v, c; | |
739 | BOOL negated = FALSE; | |
740 | uschar *saveline = s; | |
741 | uschar name[64]; | |
742 | ||
743 | /* Conditions (but not verbs) are allowed to be negated by an initial | |
744 | exclamation mark. */ | |
745 | ||
746 | while (isspace(*s)) s++; | |
747 | if (*s == '!') | |
748 | { | |
749 | negated = TRUE; | |
750 | s++; | |
751 | } | |
752 | ||
cf00dad6 PH |
753 | /* Read the name of a verb or a condition, or the start of a new ACL, which |
754 | can be started by a name, or by a macro definition. */ | |
059ec3d9 PH |
755 | |
756 | s = readconf_readname(name, sizeof(name), s); | |
b8dc3e4a | 757 | if (*s == ':' || (isupper(name[0]) && *s == '=')) return yield; |
059ec3d9 PH |
758 | |
759 | /* If a verb is unrecognized, it may be another condition or modifier that | |
760 | continues the previous verb. */ | |
761 | ||
2d009132 | 762 | if ((v = acl_checkname(name, verbs, nelem(verbs))) < 0) |
059ec3d9 PH |
763 | { |
764 | if (this == NULL) | |
765 | { | |
4e167a8c PH |
766 | *error = string_sprintf("unknown ACL verb \"%s\" in \"%s\"", name, |
767 | saveline); | |
059ec3d9 PH |
768 | return NULL; |
769 | } | |
770 | } | |
771 | ||
772 | /* New verb */ | |
773 | ||
774 | else | |
775 | { | |
776 | if (negated) | |
777 | { | |
778 | *error = string_sprintf("malformed ACL line \"%s\"", saveline); | |
779 | return NULL; | |
780 | } | |
781 | this = store_get(sizeof(acl_block)); | |
782 | *lastp = this; | |
783 | lastp = &(this->next); | |
784 | this->next = NULL; | |
785 | this->verb = v; | |
786 | this->condition = NULL; | |
787 | condp = &(this->condition); | |
788 | if (*s == 0) continue; /* No condition on this line */ | |
789 | if (*s == '!') | |
790 | { | |
791 | negated = TRUE; | |
792 | s++; | |
793 | } | |
794 | s = readconf_readname(name, sizeof(name), s); /* Condition name */ | |
795 | } | |
796 | ||
797 | /* Handle a condition or modifier. */ | |
798 | ||
2d009132 | 799 | if ((c = acl_checkcondition(name, conditions, nelem(conditions))) < 0) |
059ec3d9 PH |
800 | { |
801 | *error = string_sprintf("unknown ACL condition/modifier in \"%s\"", | |
802 | saveline); | |
803 | return NULL; | |
804 | } | |
805 | ||
806 | /* The modifiers may not be negated */ | |
807 | ||
2d009132 | 808 | if (negated && conditions[c].is_modifier) |
059ec3d9 PH |
809 | { |
810 | *error = string_sprintf("ACL error: negation is not allowed with " | |
2d009132 | 811 | "\"%s\"", conditions[c].name); |
059ec3d9 PH |
812 | return NULL; |
813 | } | |
814 | ||
815 | /* ENDPASS may occur only with ACCEPT or DISCARD. */ | |
816 | ||
817 | if (c == ACLC_ENDPASS && | |
818 | this->verb != ACL_ACCEPT && | |
819 | this->verb != ACL_DISCARD) | |
820 | { | |
821 | *error = string_sprintf("ACL error: \"%s\" is not allowed with \"%s\"", | |
2d009132 | 822 | conditions[c].name, verbs[this->verb]); |
059ec3d9 PH |
823 | return NULL; |
824 | } | |
825 | ||
826 | cond = store_get(sizeof(acl_condition_block)); | |
827 | cond->next = NULL; | |
828 | cond->type = c; | |
829 | cond->u.negated = negated; | |
830 | ||
831 | *condp = cond; | |
832 | condp = &(cond->next); | |
833 | ||
834 | /* The "set" modifier is different in that its argument is "name=value" | |
835 | rather than just a value, and we can check the validity of the name, which | |
38a0a95f PH |
836 | gives us a variable name to insert into the data block. The original ACL |
837 | variable names were acl_c0 ... acl_c9 and acl_m0 ... acl_m9. This was | |
838 | extended to 20 of each type, but after that people successfully argued for | |
641cb756 PH |
839 | arbitrary names. In the new scheme, the names must start with acl_c or acl_m. |
840 | After that, we allow alphanumerics and underscores, but the first character | |
841 | after c or m must be a digit or an underscore. This retains backwards | |
842 | compatibility. */ | |
059ec3d9 PH |
843 | |
844 | if (c == ACLC_SET) | |
a79d8834 JH |
845 | #ifndef DISABLE_DKIM |
846 | if ( Ustrncmp(s, "dkim_verify_status", 18) == 0 | |
847 | || Ustrncmp(s, "dkim_verify_reason", 18) == 0) | |
848 | { | |
849 | uschar * endptr = s+18; | |
850 | ||
851 | if (isalnum(*endptr)) | |
852 | { | |
853 | *error = string_sprintf("invalid variable name after \"set\" in ACL " | |
854 | "modifier \"set %s\" " | |
855 | "(only \"dkim_verify_status\" or \"dkim_verify_reason\" permitted)", | |
856 | s); | |
857 | return NULL; | |
858 | } | |
859 | cond->u.varname = string_copyn(s, 18); | |
860 | s = endptr; | |
861 | while (isspace(*s)) s++; | |
862 | } | |
863 | else | |
864 | #endif | |
059ec3d9 | 865 | { |
47ca6d6c PH |
866 | uschar *endptr; |
867 | ||
38a0a95f PH |
868 | if (Ustrncmp(s, "acl_c", 5) != 0 && |
869 | Ustrncmp(s, "acl_m", 5) != 0) | |
47ca6d6c | 870 | { |
38a0a95f PH |
871 | *error = string_sprintf("invalid variable name after \"set\" in ACL " |
872 | "modifier \"set %s\" (must start \"acl_c\" or \"acl_m\")", s); | |
873 | return NULL; | |
47ca6d6c | 874 | } |
38a0a95f PH |
875 | |
876 | endptr = s + 5; | |
641cb756 PH |
877 | if (!isdigit(*endptr) && *endptr != '_') |
878 | { | |
879 | *error = string_sprintf("invalid variable name after \"set\" in ACL " | |
880 | "modifier \"set %s\" (digit or underscore must follow acl_c or acl_m)", | |
881 | s); | |
882 | return NULL; | |
883 | } | |
884 | ||
38a0a95f | 885 | while (*endptr != 0 && *endptr != '=' && !isspace(*endptr)) |
47ca6d6c | 886 | { |
38a0a95f PH |
887 | if (!isalnum(*endptr) && *endptr != '_') |
888 | { | |
889 | *error = string_sprintf("invalid character \"%c\" in variable name " | |
890 | "in ACL modifier \"set %s\"", *endptr, s); | |
891 | return NULL; | |
892 | } | |
893 | endptr++; | |
47ca6d6c | 894 | } |
47ca6d6c | 895 | |
38a0a95f | 896 | cond->u.varname = string_copyn(s + 4, endptr - s - 4); |
47ca6d6c | 897 | s = endptr; |
059ec3d9 PH |
898 | while (isspace(*s)) s++; |
899 | } | |
900 | ||
901 | /* For "set", we are now positioned for the data. For the others, only | |
902 | "endpass" has no data */ | |
903 | ||
904 | if (c != ACLC_ENDPASS) | |
905 | { | |
906 | if (*s++ != '=') | |
907 | { | |
908 | *error = string_sprintf("\"=\" missing after ACL \"%s\" %s", name, | |
2d009132 | 909 | conditions[c].is_modifier ? US"modifier" : US"condition"); |
059ec3d9 PH |
910 | return NULL; |
911 | } | |
912 | while (isspace(*s)) s++; | |
913 | cond->arg = string_copy(s); | |
914 | } | |
915 | } | |
916 | ||
917 | return yield; | |
918 | } | |
919 | ||
920 | ||
921 | ||
71fafd95 PH |
922 | /************************************************* |
923 | * Set up added header line(s) * | |
924 | *************************************************/ | |
925 | ||
926 | /* This function is called by the add_header modifier, and also from acl_warn() | |
927 | to implement the now-deprecated way of adding header lines using "message" on a | |
928 | "warn" verb. The argument is treated as a sequence of header lines which are | |
929 | added to a chain, provided there isn't an identical one already there. | |
930 | ||
931 | Argument: string of header lines | |
932 | Returns: nothing | |
933 | */ | |
934 | ||
935 | static void | |
55414b25 | 936 | setup_header(const uschar *hstring) |
71fafd95 | 937 | { |
55414b25 | 938 | const uschar *p, *q; |
71fafd95 PH |
939 | int hlen = Ustrlen(hstring); |
940 | ||
b1b05573 JH |
941 | /* Ignore any leading newlines */ |
942 | while (*hstring == '\n') hstring++, hlen--; | |
71fafd95 | 943 | |
b1b05573 | 944 | /* An empty string does nothing; ensure exactly one final newline. */ |
71fafd95 | 945 | if (hlen <= 0) return; |
96f5fe4c | 946 | if (hstring[--hlen] != '\n') /* no newline */ |
55414b25 | 947 | q = string_sprintf("%s\n", hstring); |
96f5fe4c | 948 | else if (hstring[hlen-1] == '\n') /* double newline */ |
55414b25 JH |
949 | { |
950 | uschar * s = string_copy(hstring); | |
951 | while(s[--hlen] == '\n') | |
952 | s[hlen+1] = '\0'; | |
953 | q = s; | |
954 | } | |
955 | else | |
956 | q = hstring; | |
71fafd95 PH |
957 | |
958 | /* Loop for multiple header lines, taking care about continuations */ | |
959 | ||
55414b25 | 960 | for (p = q; *p != 0; ) |
71fafd95 | 961 | { |
55414b25 JH |
962 | const uschar *s; |
963 | uschar * hdr; | |
71fafd95 PH |
964 | int newtype = htype_add_bot; |
965 | header_line **hptr = &acl_added_headers; | |
966 | ||
967 | /* Find next header line within the string */ | |
968 | ||
969 | for (;;) | |
970 | { | |
96f5fe4c | 971 | q = Ustrchr(q, '\n'); /* we know there was a newline */ |
71fafd95 PH |
972 | if (*(++q) != ' ' && *q != '\t') break; |
973 | } | |
974 | ||
975 | /* If the line starts with a colon, interpret the instruction for where to | |
976 | add it. This temporarily sets up a new type. */ | |
977 | ||
978 | if (*p == ':') | |
979 | { | |
980 | if (strncmpic(p, US":after_received:", 16) == 0) | |
981 | { | |
982 | newtype = htype_add_rec; | |
983 | p += 16; | |
984 | } | |
985 | else if (strncmpic(p, US":at_start_rfc:", 14) == 0) | |
986 | { | |
987 | newtype = htype_add_rfc; | |
988 | p += 14; | |
989 | } | |
990 | else if (strncmpic(p, US":at_start:", 10) == 0) | |
991 | { | |
992 | newtype = htype_add_top; | |
993 | p += 10; | |
994 | } | |
995 | else if (strncmpic(p, US":at_end:", 8) == 0) | |
996 | { | |
997 | newtype = htype_add_bot; | |
998 | p += 8; | |
999 | } | |
1000 | while (*p == ' ' || *p == '\t') p++; | |
1001 | } | |
1002 | ||
1003 | /* See if this line starts with a header name, and if not, add X-ACL-Warn: | |
1004 | to the front of it. */ | |
1005 | ||
1006 | for (s = p; s < q - 1; s++) | |
1007 | { | |
1008 | if (*s == ':' || !isgraph(*s)) break; | |
1009 | } | |
1010 | ||
55414b25 JH |
1011 | hdr = string_sprintf("%s%.*s", (*s == ':')? "" : "X-ACL-Warn: ", (int) (q - p), p); |
1012 | hlen = Ustrlen(hdr); | |
71fafd95 PH |
1013 | |
1014 | /* See if this line has already been added */ | |
1015 | ||
1016 | while (*hptr != NULL) | |
1017 | { | |
55414b25 | 1018 | if (Ustrncmp((*hptr)->text, hdr, hlen) == 0) break; |
71fafd95 PH |
1019 | hptr = &((*hptr)->next); |
1020 | } | |
1021 | ||
1022 | /* Add if not previously present */ | |
1023 | ||
1024 | if (*hptr == NULL) | |
1025 | { | |
1026 | header_line *h = store_get(sizeof(header_line)); | |
55414b25 | 1027 | h->text = hdr; |
71fafd95 PH |
1028 | h->next = NULL; |
1029 | h->type = newtype; | |
1030 | h->slen = hlen; | |
1031 | *hptr = h; | |
1032 | hptr = &(h->next); | |
1033 | } | |
1034 | ||
1035 | /* Advance for next header line within the string */ | |
1036 | ||
1037 | p = q; | |
1038 | } | |
1039 | } | |
1040 | ||
1041 | ||
1042 | ||
362145b5 JH |
1043 | /************************************************* |
1044 | * List the added header lines * | |
1045 | *************************************************/ | |
1046 | uschar * | |
1047 | fn_hdrs_added(void) | |
1048 | { | |
acec9514 | 1049 | gstring * g = NULL; |
362145b5 JH |
1050 | header_line * h = acl_added_headers; |
1051 | uschar * s; | |
1052 | uschar * cp; | |
362145b5 JH |
1053 | |
1054 | if (!h) return NULL; | |
1055 | ||
1056 | do | |
1057 | { | |
1058 | s = h->text; | |
1059 | while ((cp = Ustrchr(s, '\n')) != NULL) | |
1060 | { | |
1061 | if (cp[1] == '\0') break; | |
1062 | ||
1063 | /* contains embedded newline; needs doubling */ | |
acec9514 JH |
1064 | g = string_catn(g, s, cp-s+1); |
1065 | g = string_catn(g, US"\n", 1); | |
362145b5 JH |
1066 | s = cp+1; |
1067 | } | |
1068 | /* last bit of header */ | |
1069 | ||
acec9514 JH |
1070 | /*XXX could we use add_listele? */ |
1071 | g = string_catn(g, s, cp-s+1); /* newline-sep list */ | |
362145b5 | 1072 | } |
6d9cfc47 | 1073 | while((h = h->next)); |
362145b5 | 1074 | |
acec9514 JH |
1075 | g->s[g->ptr - 1] = '\0'; /* overwrite last newline */ |
1076 | return g->s; | |
362145b5 JH |
1077 | } |
1078 | ||
1079 | ||
e7568d51 TL |
1080 | /************************************************* |
1081 | * Set up removed header line(s) * | |
1082 | *************************************************/ | |
1083 | ||
1084 | /* This function is called by the remove_header modifier. The argument is | |
1085 | treated as a sequence of header names which are added to a colon separated | |
1086 | list, provided there isn't an identical one already there. | |
1087 | ||
1088 | Argument: string of header names | |
1089 | Returns: nothing | |
1090 | */ | |
1091 | ||
1092 | static void | |
55414b25 | 1093 | setup_remove_header(const uschar *hnames) |
e7568d51 TL |
1094 | { |
1095 | if (*hnames != 0) | |
55414b25 JH |
1096 | acl_removed_headers = acl_removed_headers |
1097 | ? string_sprintf("%s : %s", acl_removed_headers, hnames) | |
1098 | : string_copy(hnames); | |
e7568d51 TL |
1099 | } |
1100 | ||
1101 | ||
71fafd95 | 1102 | |
059ec3d9 PH |
1103 | /************************************************* |
1104 | * Handle warnings * | |
1105 | *************************************************/ | |
1106 | ||
1107 | /* This function is called when a WARN verb's conditions are true. It adds to | |
1108 | the message's headers, and/or writes information to the log. In each case, this | |
1109 | only happens once (per message for headers, per connection for log). | |
1110 | ||
71fafd95 PH |
1111 | ** NOTE: The header adding action using the "message" setting is historic, and |
1112 | its use is now deprecated. The new add_header modifier should be used instead. | |
1113 | ||
059ec3d9 PH |
1114 | Arguments: |
1115 | where ACL_WHERE_xxxx indicating which ACL this is | |
1116 | user_message message for adding to headers | |
1117 | log_message message for logging, if different | |
1118 | ||
1119 | Returns: nothing | |
1120 | */ | |
1121 | ||
1122 | static void | |
1123 | acl_warn(int where, uschar *user_message, uschar *log_message) | |
1124 | { | |
059ec3d9 PH |
1125 | if (log_message != NULL && log_message != user_message) |
1126 | { | |
1127 | uschar *text; | |
1128 | string_item *logged; | |
1129 | ||
1130 | text = string_sprintf("%s Warning: %s", host_and_ident(TRUE), | |
1131 | string_printing(log_message)); | |
1132 | ||
1133 | /* If a sender verification has failed, and the log message is "sender verify | |
1134 | failed", add the failure message. */ | |
1135 | ||
1136 | if (sender_verified_failed != NULL && | |
1137 | sender_verified_failed->message != NULL && | |
1138 | strcmpic(log_message, US"sender verify failed") == 0) | |
1139 | text = string_sprintf("%s: %s", text, sender_verified_failed->message); | |
1140 | ||
9c7a242c PH |
1141 | /* Search previously logged warnings. They are kept in malloc |
1142 | store so they can be freed at the start of a new message. */ | |
059ec3d9 PH |
1143 | |
1144 | for (logged = acl_warn_logged; logged != NULL; logged = logged->next) | |
1145 | if (Ustrcmp(logged->text, text) == 0) break; | |
1146 | ||
1147 | if (logged == NULL) | |
1148 | { | |
1149 | int length = Ustrlen(text) + 1; | |
1150 | log_write(0, LOG_MAIN, "%s", text); | |
1151 | logged = store_malloc(sizeof(string_item) + length); | |
5903c6ff | 1152 | logged->text = US logged + sizeof(string_item); |
059ec3d9 PH |
1153 | memcpy(logged->text, text, length); |
1154 | logged->next = acl_warn_logged; | |
1155 | acl_warn_logged = logged; | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | /* If there's no user message, we are done. */ | |
1160 | ||
1161 | if (user_message == NULL) return; | |
1162 | ||
1163 | /* If this isn't a message ACL, we can't do anything with a user message. | |
1164 | Log an error. */ | |
1165 | ||
1166 | if (where > ACL_WHERE_NOTSMTP) | |
1167 | { | |
1168 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting " | |
1169 | "found in a non-message (%s) ACL: cannot specify header lines here: " | |
1170 | "message ignored", acl_wherenames[where]); | |
1171 | return; | |
1172 | } | |
1173 | ||
71fafd95 PH |
1174 | /* The code for setting up header lines is now abstracted into a separate |
1175 | function so that it can be used for the add_header modifier as well. */ | |
059ec3d9 | 1176 | |
71fafd95 | 1177 | setup_header(user_message); |
059ec3d9 PH |
1178 | } |
1179 | ||
1180 | ||
1181 | ||
1182 | /************************************************* | |
1183 | * Verify and check reverse DNS * | |
1184 | *************************************************/ | |
1185 | ||
1186 | /* Called from acl_verify() below. We look up the host name(s) of the client IP | |
1187 | address if this has not yet been done. The host_name_lookup() function checks | |
1188 | that one of these names resolves to an address list that contains the client IP | |
1189 | address, so we don't actually have to do the check here. | |
1190 | ||
1191 | Arguments: | |
1192 | user_msgptr pointer for user message | |
1193 | log_msgptr pointer for log message | |
1194 | ||
1195 | Returns: OK verification condition succeeded | |
1196 | FAIL verification failed | |
1197 | DEFER there was a problem verifying | |
1198 | */ | |
1199 | ||
1200 | static int | |
1201 | acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr) | |
1202 | { | |
1203 | int rc; | |
1204 | ||
1205 | user_msgptr = user_msgptr; /* stop compiler warning */ | |
1206 | ||
1207 | /* Previous success */ | |
1208 | ||
1209 | if (sender_host_name != NULL) return OK; | |
1210 | ||
1211 | /* Previous failure */ | |
1212 | ||
1213 | if (host_lookup_failed) | |
1214 | { | |
1215 | *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg); | |
1216 | return FAIL; | |
1217 | } | |
1218 | ||
1219 | /* Need to do a lookup */ | |
1220 | ||
1221 | HDEBUG(D_acl) | |
e1d04f48 | 1222 | debug_printf_indent("looking up host name to force name/address consistency check\n"); |
059ec3d9 PH |
1223 | |
1224 | if ((rc = host_name_lookup()) != OK) | |
1225 | { | |
1226 | *log_msgptr = (rc == DEFER)? | |
1227 | US"host lookup deferred for reverse lookup check" | |
1228 | : | |
1229 | string_sprintf("host lookup failed for reverse lookup check%s", | |
1230 | host_lookup_msg); | |
1231 | return rc; /* DEFER or FAIL */ | |
1232 | } | |
1233 | ||
1234 | host_build_sender_fullhost(); | |
1235 | return OK; | |
1236 | } | |
1237 | ||
1238 | ||
1239 | ||
e5a9dba6 PH |
1240 | /************************************************* |
1241 | * Check client IP address matches CSA target * | |
1242 | *************************************************/ | |
1243 | ||
1244 | /* Called from acl_verify_csa() below. This routine scans a section of a DNS | |
1245 | response for address records belonging to the CSA target hostname. The section | |
1246 | is specified by the reset argument, either RESET_ADDITIONAL or RESET_ANSWERS. | |
1247 | If one of the addresses matches the client's IP address, then the client is | |
1248 | authorized by CSA. If there are target IP addresses but none of them match | |
1249 | then the client is using an unauthorized IP address. If there are no target IP | |
1250 | addresses then the client cannot be using an authorized IP address. (This is | |
1251 | an odd configuration - why didn't the SRV record have a weight of 1 instead?) | |
1252 | ||
1253 | Arguments: | |
1254 | dnsa the DNS answer block | |
1255 | dnss a DNS scan block for us to use | |
4c04137d | 1256 | reset option specifying what portion to scan, as described above |
e5a9dba6 PH |
1257 | target the target hostname to use for matching RR names |
1258 | ||
1259 | Returns: CSA_OK successfully authorized | |
1260 | CSA_FAIL_MISMATCH addresses found but none matched | |
1261 | CSA_FAIL_NOADDR no target addresses found | |
1262 | */ | |
1263 | ||
1264 | static int | |
1265 | acl_verify_csa_address(dns_answer *dnsa, dns_scan *dnss, int reset, | |
1266 | uschar *target) | |
1267 | { | |
1268 | dns_record *rr; | |
1269 | dns_address *da; | |
1270 | ||
1271 | BOOL target_found = FALSE; | |
1272 | ||
1273 | for (rr = dns_next_rr(dnsa, dnss, reset); | |
1274 | rr != NULL; | |
1275 | rr = dns_next_rr(dnsa, dnss, RESET_NEXT)) | |
1276 | { | |
1277 | /* Check this is an address RR for the target hostname. */ | |
1278 | ||
1279 | if (rr->type != T_A | |
1280 | #if HAVE_IPV6 | |
1281 | && rr->type != T_AAAA | |
e5a9dba6 PH |
1282 | #endif |
1283 | ) continue; | |
1284 | ||
1285 | if (strcmpic(target, rr->name) != 0) continue; | |
1286 | ||
1287 | target_found = TRUE; | |
1288 | ||
1289 | /* Turn the target address RR into a list of textual IP addresses and scan | |
1290 | the list. There may be more than one if it is an A6 RR. */ | |
1291 | ||
1292 | for (da = dns_address_from_rr(dnsa, rr); da != NULL; da = da->next) | |
1293 | { | |
1294 | /* If the client IP address matches the target IP address, it's good! */ | |
1295 | ||
e1d04f48 | 1296 | DEBUG(D_acl) debug_printf_indent("CSA target address is %s\n", da->address); |
e5a9dba6 PH |
1297 | |
1298 | if (strcmpic(sender_host_address, da->address) == 0) return CSA_OK; | |
1299 | } | |
1300 | } | |
1301 | ||
1302 | /* If we found some target addresses but none of them matched, the client is | |
1303 | using an unauthorized IP address, otherwise the target has no authorized IP | |
1304 | addresses. */ | |
1305 | ||
1306 | if (target_found) return CSA_FAIL_MISMATCH; | |
1307 | else return CSA_FAIL_NOADDR; | |
1308 | } | |
1309 | ||
1310 | ||
1311 | ||
1312 | /************************************************* | |
1313 | * Verify Client SMTP Authorization * | |
1314 | *************************************************/ | |
1315 | ||
1316 | /* Called from acl_verify() below. This routine calls dns_lookup_special() | |
1317 | to find the CSA SRV record corresponding to the domain argument, or | |
1318 | $sender_helo_name if no argument is provided. It then checks that the | |
1319 | client is authorized, and that its IP address corresponds to the SRV | |
1320 | target's address by calling acl_verify_csa_address() above. The address | |
1321 | should have been returned in the DNS response's ADDITIONAL section, but if | |
1322 | not we perform another DNS lookup to get it. | |
1323 | ||
1324 | Arguments: | |
1325 | domain pointer to optional parameter following verify = csa | |
1326 | ||
1327 | Returns: CSA_UNKNOWN no valid CSA record found | |
1328 | CSA_OK successfully authorized | |
1329 | CSA_FAIL_* client is definitely not authorized | |
1330 | CSA_DEFER_* there was a DNS problem | |
1331 | */ | |
1332 | ||
1333 | static int | |
55414b25 | 1334 | acl_verify_csa(const uschar *domain) |
e5a9dba6 PH |
1335 | { |
1336 | tree_node *t; | |
55414b25 | 1337 | const uschar *found; |
e5a9dba6 PH |
1338 | int priority, weight, port; |
1339 | dns_answer dnsa; | |
1340 | dns_scan dnss; | |
1341 | dns_record *rr; | |
1342 | int rc, type; | |
1343 | uschar target[256]; | |
1344 | ||
1345 | /* Work out the domain we are using for the CSA lookup. The default is the | |
1346 | client's HELO domain. If the client has not said HELO, use its IP address | |
1347 | instead. If it's a local client (exim -bs), CSA isn't applicable. */ | |
1348 | ||
1349 | while (isspace(*domain) && *domain != '\0') ++domain; | |
1350 | if (*domain == '\0') domain = sender_helo_name; | |
1351 | if (domain == NULL) domain = sender_host_address; | |
1352 | if (sender_host_address == NULL) return CSA_UNKNOWN; | |
1353 | ||
1354 | /* If we have an address literal, strip off the framing ready for turning it | |
1355 | into a domain. The framing consists of matched square brackets possibly | |
1356 | containing a keyword and a colon before the actual IP address. */ | |
1357 | ||
1358 | if (domain[0] == '[') | |
1359 | { | |
55414b25 | 1360 | const uschar *start = Ustrchr(domain, ':'); |
e5a9dba6 PH |
1361 | if (start == NULL) start = domain; |
1362 | domain = string_copyn(start + 1, Ustrlen(start) - 2); | |
1363 | } | |
1364 | ||
1365 | /* Turn domains that look like bare IP addresses into domains in the reverse | |
1366 | DNS. This code also deals with address literals and $sender_host_address. It's | |
1367 | not quite kosher to treat bare domains such as EHLO 192.0.2.57 the same as | |
1368 | address literals, but it's probably the most friendly thing to do. This is an | |
1369 | extension to CSA, so we allow it to be turned off for proper conformance. */ | |
1370 | ||
7e66e54d | 1371 | if (string_is_ip_address(domain, NULL) != 0) |
e5a9dba6 PH |
1372 | { |
1373 | if (!dns_csa_use_reverse) return CSA_UNKNOWN; | |
1374 | dns_build_reverse(domain, target); | |
1375 | domain = target; | |
1376 | } | |
1377 | ||
1378 | /* Find out if we've already done the CSA check for this domain. If we have, | |
1379 | return the same result again. Otherwise build a new cached result structure | |
1380 | for this domain. The name is filled in now, and the value is filled in when | |
1381 | we return from this function. */ | |
1382 | ||
1383 | t = tree_search(csa_cache, domain); | |
1384 | if (t != NULL) return t->data.val; | |
1385 | ||
1386 | t = store_get_perm(sizeof(tree_node) + Ustrlen(domain)); | |
1387 | Ustrcpy(t->name, domain); | |
1388 | (void)tree_insertnode(&csa_cache, t); | |
1389 | ||
1390 | /* Now we are ready to do the actual DNS lookup(s). */ | |
1391 | ||
28e6ef29 | 1392 | found = domain; |
e5a9dba6 PH |
1393 | switch (dns_special_lookup(&dnsa, domain, T_CSA, &found)) |
1394 | { | |
1395 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1396 | ||
1397 | default: | |
1398 | return t->data.val = CSA_DEFER_SRV; | |
1399 | ||
1400 | /* If we found nothing, the client's authorization is unknown. */ | |
1401 | ||
1402 | case DNS_NOMATCH: | |
1403 | case DNS_NODATA: | |
1404 | return t->data.val = CSA_UNKNOWN; | |
1405 | ||
1406 | /* We got something! Go on to look at the reply in more detail. */ | |
1407 | ||
1408 | case DNS_SUCCEED: | |
1409 | break; | |
1410 | } | |
1411 | ||
1412 | /* Scan the reply for well-formed CSA SRV records. */ | |
1413 | ||
1414 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
dd708fd7 JH |
1415 | rr; |
1416 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) if (rr->type == T_SRV) | |
e5a9dba6 | 1417 | { |
dd708fd7 | 1418 | const uschar * p = rr->data; |
e5a9dba6 PH |
1419 | |
1420 | /* Extract the numerical SRV fields (p is incremented) */ | |
1421 | ||
e5a9dba6 PH |
1422 | GETSHORT(priority, p); |
1423 | GETSHORT(weight, p); | |
1424 | GETSHORT(port, p); | |
1425 | ||
1426 | DEBUG(D_acl) | |
e1d04f48 | 1427 | debug_printf_indent("CSA priority=%d weight=%d port=%d\n", priority, weight, port); |
e5a9dba6 PH |
1428 | |
1429 | /* Check the CSA version number */ | |
1430 | ||
1431 | if (priority != 1) continue; | |
1432 | ||
1433 | /* If the domain does not have a CSA SRV record of its own (i.e. the domain | |
1434 | found by dns_special_lookup() is a parent of the one we asked for), we check | |
1435 | the subdomain assertions in the port field. At the moment there's only one | |
1436 | assertion: legitimate SMTP clients are all explicitly authorized with CSA | |
1437 | SRV records of their own. */ | |
1438 | ||
1dc92d5a | 1439 | if (Ustrcmp(found, domain) != 0) |
dd708fd7 | 1440 | return t->data.val = port & 1 ? CSA_FAIL_EXPLICIT : CSA_UNKNOWN; |
e5a9dba6 PH |
1441 | |
1442 | /* This CSA SRV record refers directly to our domain, so we check the value | |
1443 | in the weight field to work out the domain's authorization. 0 and 1 are | |
1444 | unauthorized; 3 means the client is authorized but we can't check the IP | |
1445 | address in order to authenticate it, so we treat it as unknown; values | |
1446 | greater than 3 are undefined. */ | |
1447 | ||
1448 | if (weight < 2) return t->data.val = CSA_FAIL_DOMAIN; | |
1449 | ||
1450 | if (weight > 2) continue; | |
1451 | ||
1452 | /* Weight == 2, which means the domain is authorized. We must check that the | |
1453 | client's IP address is listed as one of the SRV target addresses. Save the | |
1454 | target hostname then break to scan the additional data for its addresses. */ | |
1455 | ||
1456 | (void)dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, | |
1457 | (DN_EXPAND_ARG4_TYPE)target, sizeof(target)); | |
1458 | ||
e1d04f48 | 1459 | DEBUG(D_acl) debug_printf_indent("CSA target is %s\n", target); |
e5a9dba6 PH |
1460 | |
1461 | break; | |
1462 | } | |
1463 | ||
1464 | /* If we didn't break the loop then no appropriate records were found. */ | |
1465 | ||
1466 | if (rr == NULL) return t->data.val = CSA_UNKNOWN; | |
1467 | ||
1468 | /* Do not check addresses if the target is ".", in accordance with RFC 2782. | |
1469 | A target of "." indicates there are no valid addresses, so the client cannot | |
1470 | be authorized. (This is an odd configuration because weight=2 target=. is | |
1471 | equivalent to weight=1, but we check for it in order to keep load off the | |
1472 | root name servers.) Note that dn_expand() turns "." into "". */ | |
1473 | ||
1474 | if (Ustrcmp(target, "") == 0) return t->data.val = CSA_FAIL_NOADDR; | |
1475 | ||
1476 | /* Scan the additional section of the CSA SRV reply for addresses belonging | |
1477 | to the target. If the name server didn't return any additional data (e.g. | |
1478 | because it does not fully support SRV records), we need to do another lookup | |
1479 | to obtain the target addresses; otherwise we have a definitive result. */ | |
1480 | ||
1481 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ADDITIONAL, target); | |
1482 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1483 | ||
1484 | /* The DNS lookup type corresponds to the IP version used by the client. */ | |
1485 | ||
1486 | #if HAVE_IPV6 | |
1487 | if (Ustrchr(sender_host_address, ':') != NULL) | |
1488 | type = T_AAAA; | |
1489 | else | |
1490 | #endif /* HAVE_IPV6 */ | |
1491 | type = T_A; | |
1492 | ||
1493 | ||
4e0983dc | 1494 | lookup_dnssec_authenticated = NULL; |
e5a9dba6 PH |
1495 | switch (dns_lookup(&dnsa, target, type, NULL)) |
1496 | { | |
1497 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1498 | ||
1499 | default: | |
cc00f4af | 1500 | return t->data.val = CSA_DEFER_ADDR; |
e5a9dba6 PH |
1501 | |
1502 | /* If the query succeeded, scan the addresses and return the result. */ | |
1503 | ||
1504 | case DNS_SUCCEED: | |
cc00f4af JH |
1505 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ANSWERS, target); |
1506 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1507 | /* else fall through */ | |
e5a9dba6 PH |
1508 | |
1509 | /* If the target has no IP addresses, the client cannot have an authorized | |
1510 | IP address. However, if the target site uses A6 records (not AAAA records) | |
1511 | we have to do yet another lookup in order to check them. */ | |
1512 | ||
1513 | case DNS_NOMATCH: | |
1514 | case DNS_NODATA: | |
cc00f4af | 1515 | return t->data.val = CSA_FAIL_NOADDR; |
e5a9dba6 PH |
1516 | } |
1517 | } | |
1518 | ||
1519 | ||
1520 | ||
059ec3d9 PH |
1521 | /************************************************* |
1522 | * Handle verification (address & other) * | |
1523 | *************************************************/ | |
1524 | ||
89583014 | 1525 | enum { VERIFY_REV_HOST_LKUP, VERIFY_CERT, VERIFY_HELO, VERIFY_CSA, VERIFY_HDR_SYNTAX, |
770747fd | 1526 | VERIFY_NOT_BLIND, VERIFY_HDR_SNDR, VERIFY_SNDR, VERIFY_RCPT, |
e3a69b62 | 1527 | VERIFY_HDR_NAMES_ASCII, VERIFY_ARC |
89583014 JH |
1528 | }; |
1529 | typedef struct { | |
1530 | uschar * name; | |
1531 | int value; | |
1532 | unsigned where_allowed; /* bitmap */ | |
1533 | BOOL no_options; /* Never has /option(s) following */ | |
1534 | unsigned alt_opt_sep; /* >0 Non-/ option separator (custom parser) */ | |
1535 | } verify_type_t; | |
1536 | static verify_type_t verify_type_list[] = { | |
f2ed27cf | 1537 | /* name value where no-opt opt-sep */ |
7e8360e6 | 1538 | { US"reverse_host_lookup", VERIFY_REV_HOST_LKUP, ~0, FALSE, 0 }, |
e3a69b62 JH |
1539 | { US"certificate", VERIFY_CERT, ~0, TRUE, 0 }, |
1540 | { US"helo", VERIFY_HELO, ~0, TRUE, 0 }, | |
89583014 | 1541 | { US"csa", VERIFY_CSA, ~0, FALSE, 0 }, |
e3a69b62 JH |
1542 | { US"header_syntax", VERIFY_HDR_SYNTAX, ACL_BIT_DATA | ACL_BIT_NOTSMTP, TRUE, 0 }, |
1543 | { US"not_blind", VERIFY_NOT_BLIND, ACL_BIT_DATA | ACL_BIT_NOTSMTP, TRUE, 0 }, | |
1544 | { US"header_sender", VERIFY_HDR_SNDR, ACL_BIT_DATA | ACL_BIT_NOTSMTP, FALSE, 0 }, | |
1545 | { US"sender", VERIFY_SNDR, ACL_BIT_MAIL | ACL_BIT_RCPT | |
1546 | |ACL_BIT_PREDATA | ACL_BIT_DATA | ACL_BIT_NOTSMTP, | |
89583014 | 1547 | FALSE, 6 }, |
e3a69b62 JH |
1548 | { US"recipient", VERIFY_RCPT, ACL_BIT_RCPT, FALSE, 0 }, |
1549 | { US"header_names_ascii", VERIFY_HDR_NAMES_ASCII, ACL_BIT_DATA | ACL_BIT_NOTSMTP, TRUE, 0 }, | |
1550 | #ifdef EXPERIMENTAL_ARC | |
1551 | { US"arc", VERIFY_ARC, ACL_BIT_DATA, TRUE , 0 }, | |
1552 | #endif | |
89583014 JH |
1553 | }; |
1554 | ||
1555 | ||
1556 | enum { CALLOUT_DEFER_OK, CALLOUT_NOCACHE, CALLOUT_RANDOM, CALLOUT_USE_SENDER, | |
1557 | CALLOUT_USE_POSTMASTER, CALLOUT_POSTMASTER, CALLOUT_FULLPOSTMASTER, | |
1558 | CALLOUT_MAILFROM, CALLOUT_POSTMASTER_MAILFROM, CALLOUT_MAXWAIT, CALLOUT_CONNECT, | |
57cc2785 | 1559 | CALLOUT_HOLD, CALLOUT_TIME /* TIME must be last */ |
89583014 JH |
1560 | }; |
1561 | typedef struct { | |
1562 | uschar * name; | |
1563 | int value; | |
1564 | int flag; | |
1565 | BOOL has_option; /* Has =option(s) following */ | |
1566 | BOOL timeval; /* Has a time value */ | |
1567 | } callout_opt_t; | |
1568 | static callout_opt_t callout_opt_list[] = { | |
f2ed27cf | 1569 | /* name value flag has-opt has-time */ |
89583014 JH |
1570 | { US"defer_ok", CALLOUT_DEFER_OK, 0, FALSE, FALSE }, |
1571 | { US"no_cache", CALLOUT_NOCACHE, vopt_callout_no_cache, FALSE, FALSE }, | |
1572 | { US"random", CALLOUT_RANDOM, vopt_callout_random, FALSE, FALSE }, | |
1573 | { US"use_sender", CALLOUT_USE_SENDER, vopt_callout_recipsender, FALSE, FALSE }, | |
1574 | { US"use_postmaster", CALLOUT_USE_POSTMASTER,vopt_callout_recippmaster, FALSE, FALSE }, | |
1575 | { US"postmaster_mailfrom",CALLOUT_POSTMASTER_MAILFROM,0, TRUE, FALSE }, | |
1576 | { US"postmaster", CALLOUT_POSTMASTER, 0, FALSE, FALSE }, | |
1577 | { US"fullpostmaster", CALLOUT_FULLPOSTMASTER,vopt_callout_fullpm, FALSE, FALSE }, | |
1578 | { US"mailfrom", CALLOUT_MAILFROM, 0, TRUE, FALSE }, | |
1579 | { US"maxwait", CALLOUT_MAXWAIT, 0, TRUE, TRUE }, | |
1580 | { US"connect", CALLOUT_CONNECT, 0, TRUE, TRUE }, | |
57cc2785 | 1581 | { US"hold", CALLOUT_HOLD, vopt_callout_hold, FALSE, FALSE }, |
89583014 JH |
1582 | { NULL, CALLOUT_TIME, 0, FALSE, TRUE } |
1583 | }; | |
1584 | ||
1585 | ||
1586 | ||
059ec3d9 PH |
1587 | /* This function implements the "verify" condition. It is called when |
1588 | encountered in any ACL, because some tests are almost always permitted. Some | |
1589 | just don't make sense, and always fail (for example, an attempt to test a host | |
1590 | lookup for a non-TCP/IP message). Others are restricted to certain ACLs. | |
1591 | ||
1592 | Arguments: | |
1593 | where where called from | |
1594 | addr the recipient address that the ACL is handling, or NULL | |
1595 | arg the argument of "verify" | |
1596 | user_msgptr pointer for user message | |
1597 | log_msgptr pointer for log message | |
1598 | basic_errno where to put verify errno | |
1599 | ||
1600 | Returns: OK verification condition succeeded | |
1601 | FAIL verification failed | |
1602 | DEFER there was a problem verifying | |
1603 | ERROR syntax error | |
1604 | */ | |
1605 | ||
1606 | static int | |
55414b25 | 1607 | acl_verify(int where, address_item *addr, const uschar *arg, |
059ec3d9 PH |
1608 | uschar **user_msgptr, uschar **log_msgptr, int *basic_errno) |
1609 | { | |
1610 | int sep = '/'; | |
1611 | int callout = -1; | |
1612 | int callout_overall = -1; | |
4deaf07d | 1613 | int callout_connect = -1; |
059ec3d9 PH |
1614 | int verify_options = 0; |
1615 | int rc; | |
1616 | BOOL verify_header_sender = FALSE; | |
1617 | BOOL defer_ok = FALSE; | |
1618 | BOOL callout_defer_ok = FALSE; | |
1619 | BOOL no_details = FALSE; | |
eafd343b | 1620 | BOOL success_on_redirect = FALSE; |
059ec3d9 PH |
1621 | address_item *sender_vaddr = NULL; |
1622 | uschar *verify_sender_address = NULL; | |
1623 | uschar *pm_mailfrom = NULL; | |
1624 | uschar *se_mailfrom = NULL; | |
596875b3 PH |
1625 | |
1626 | /* Some of the verify items have slash-separated options; some do not. Diagnose | |
89583014 | 1627 | an error if options are given for items that don't expect them. |
596875b3 PH |
1628 | */ |
1629 | ||
1630 | uschar *slash = Ustrchr(arg, '/'); | |
55414b25 | 1631 | const uschar *list = arg; |
059ec3d9 | 1632 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); |
89583014 | 1633 | verify_type_t * vp; |
059ec3d9 | 1634 | |
e3a69b62 | 1635 | if (!ss) goto BAD_VERIFY; |
059ec3d9 PH |
1636 | |
1637 | /* Handle name/address consistency verification in a separate function. */ | |
1638 | ||
89583014 | 1639 | for (vp= verify_type_list; |
5903c6ff | 1640 | CS vp < CS verify_type_list + sizeof(verify_type_list); |
89583014 JH |
1641 | vp++ |
1642 | ) | |
1643 | if (vp->alt_opt_sep ? strncmpic(ss, vp->name, vp->alt_opt_sep) == 0 | |
1644 | : strcmpic (ss, vp->name) == 0) | |
1645 | break; | |
5903c6ff | 1646 | if (CS vp >= CS verify_type_list + sizeof(verify_type_list)) |
89583014 JH |
1647 | goto BAD_VERIFY; |
1648 | ||
e3a69b62 | 1649 | if (vp->no_options && slash) |
059ec3d9 | 1650 | { |
89583014 JH |
1651 | *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" " |
1652 | "(this verify item has no options)", arg); | |
1653 | return ERROR; | |
059ec3d9 | 1654 | } |
e3a69b62 | 1655 | if (!(vp->where_allowed & BIT(where))) |
059ec3d9 | 1656 | { |
e3a69b62 JH |
1657 | *log_msgptr = string_sprintf("cannot verify %s in ACL for %s", |
1658 | vp->name, acl_wherenames[where]); | |
89583014 | 1659 | return ERROR; |
059ec3d9 | 1660 | } |
89583014 | 1661 | switch(vp->value) |
596875b3 | 1662 | { |
89583014 JH |
1663 | case VERIFY_REV_HOST_LKUP: |
1664 | if (sender_host_address == NULL) return OK; | |
7e8360e6 JH |
1665 | if ((rc = acl_verify_reverse(user_msgptr, log_msgptr)) == DEFER) |
1666 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) | |
1667 | if (strcmpic(ss, US"defer_ok") == 0) | |
1668 | return OK; | |
1669 | return rc; | |
059ec3d9 | 1670 | |
89583014 JH |
1671 | case VERIFY_CERT: |
1672 | /* TLS certificate verification is done at STARTTLS time; here we just | |
1673 | test whether it was successful or not. (This is for optional verification; for | |
1674 | mandatory verification, the connection doesn't last this long.) */ | |
e5a9dba6 | 1675 | |
3703d818 JH |
1676 | if (tls_in.certificate_verified) return OK; |
1677 | *user_msgptr = US"no verified certificate"; | |
1678 | return FAIL; | |
e5a9dba6 | 1679 | |
89583014 JH |
1680 | case VERIFY_HELO: |
1681 | /* We can test the result of optional HELO verification that might have | |
1682 | occurred earlier. If not, we can attempt the verification now. */ | |
059ec3d9 | 1683 | |
3703d818 JH |
1684 | if (!helo_verified && !helo_verify_failed) smtp_verify_helo(); |
1685 | return helo_verified? OK : FAIL; | |
059ec3d9 | 1686 | |
89583014 JH |
1687 | case VERIFY_CSA: |
1688 | /* Do Client SMTP Authorization checks in a separate function, and turn the | |
1689 | result code into user-friendly strings. */ | |
1c41c9cc | 1690 | |
3703d818 JH |
1691 | rc = acl_verify_csa(list); |
1692 | *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s", | |
89583014 | 1693 | csa_reason_string[rc]); |
3703d818 | 1694 | csa_status = csa_status_string[rc]; |
e1d04f48 | 1695 | DEBUG(D_acl) debug_printf_indent("CSA result %s\n", csa_status); |
3703d818 | 1696 | return csa_return_code[rc]; |
89583014 JH |
1697 | |
1698 | case VERIFY_HDR_SYNTAX: | |
db57e575 | 1699 | /* Check that all relevant header lines have the correct 5322-syntax. If there is |
89583014 JH |
1700 | a syntax error, we return details of the error to the sender if configured to |
1701 | send out full details. (But a "message" setting on the ACL can override, as | |
1702 | always). */ | |
1703 | ||
1704 | rc = verify_check_headers(log_msgptr); | |
3703d818 JH |
1705 | if (rc != OK && *log_msgptr) |
1706 | if (smtp_return_error_details) | |
1707 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1708 | else | |
1709 | acl_verify_message = *log_msgptr; | |
89583014 | 1710 | return rc; |
059ec3d9 | 1711 | |
770747fd MFM |
1712 | case VERIFY_HDR_NAMES_ASCII: |
1713 | /* Check that all header names are true 7 bit strings | |
1714 | See RFC 5322, 2.2. and RFC 6532, 3. */ | |
1715 | ||
1716 | rc = verify_check_header_names_ascii(log_msgptr); | |
1717 | if (rc != OK && smtp_return_error_details && *log_msgptr != NULL) | |
1718 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1719 | return rc; | |
1720 | ||
89583014 JH |
1721 | case VERIFY_NOT_BLIND: |
1722 | /* Check that no recipient of this message is "blind", that is, every envelope | |
1723 | recipient must be mentioned in either To: or Cc:. */ | |
059ec3d9 | 1724 | |
89583014 JH |
1725 | rc = verify_check_notblind(); |
1726 | if (rc != OK) | |
1727 | { | |
1728 | *log_msgptr = string_sprintf("bcc recipient detected"); | |
1729 | if (smtp_return_error_details) | |
1730 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1731 | } | |
1732 | return rc; | |
059ec3d9 | 1733 | |
89583014 JH |
1734 | /* The remaining verification tests check recipient and sender addresses, |
1735 | either from the envelope or from the header. There are a number of | |
1736 | slash-separated options that are common to all of them. */ | |
059ec3d9 | 1737 | |
89583014 JH |
1738 | case VERIFY_HDR_SNDR: |
1739 | verify_header_sender = TRUE; | |
1740 | break; | |
059ec3d9 | 1741 | |
89583014 JH |
1742 | case VERIFY_SNDR: |
1743 | /* In the case of a sender, this can optionally be followed by an address to use | |
1744 | in place of the actual sender (rare special-case requirement). */ | |
059ec3d9 | 1745 | { |
89583014 JH |
1746 | uschar *s = ss + 6; |
1747 | if (*s == 0) | |
1748 | verify_sender_address = sender_address; | |
1749 | else | |
1750 | { | |
1751 | while (isspace(*s)) s++; | |
1752 | if (*s++ != '=') goto BAD_VERIFY; | |
1753 | while (isspace(*s)) s++; | |
1754 | verify_sender_address = string_copy(s); | |
1755 | } | |
059ec3d9 | 1756 | } |
89583014 JH |
1757 | break; |
1758 | ||
1759 | case VERIFY_RCPT: | |
1760 | break; | |
059ec3d9 PH |
1761 | } |
1762 | ||
89583014 JH |
1763 | |
1764 | ||
596875b3 PH |
1765 | /* Remaining items are optional; they apply to sender and recipient |
1766 | verification, including "header sender" verification. */ | |
059ec3d9 PH |
1767 | |
1768 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) | |
1769 | != NULL) | |
1770 | { | |
1771 | if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE; | |
1772 | else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE; | |
eafd343b | 1773 | else if (strcmpic(ss, US"success_on_redirect") == 0) success_on_redirect = TRUE; |
059ec3d9 PH |
1774 | |
1775 | /* These two old options are left for backwards compatibility */ | |
1776 | ||
1777 | else if (strcmpic(ss, US"callout_defer_ok") == 0) | |
1778 | { | |
1779 | callout_defer_ok = TRUE; | |
1780 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1781 | } | |
1782 | ||
1783 | else if (strcmpic(ss, US"check_postmaster") == 0) | |
1784 | { | |
1785 | pm_mailfrom = US""; | |
1786 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1787 | } | |
1788 | ||
1789 | /* The callout option has a number of sub-options, comma separated */ | |
1790 | ||
1791 | else if (strncmpic(ss, US"callout", 7) == 0) | |
1792 | { | |
1793 | callout = CALLOUT_TIMEOUT_DEFAULT; | |
1794 | ss += 7; | |
1795 | if (*ss != 0) | |
1796 | { | |
1797 | while (isspace(*ss)) ss++; | |
1798 | if (*ss++ == '=') | |
1799 | { | |
55414b25 | 1800 | const uschar * sublist = ss; |
059ec3d9 PH |
1801 | int optsep = ','; |
1802 | uschar *opt; | |
1803 | uschar buffer[256]; | |
55414b25 | 1804 | while (isspace(*sublist)) sublist++; |
8e669ac1 | 1805 | |
57cc2785 | 1806 | while ((opt = string_nextinlist(&sublist, &optsep, buffer, sizeof(buffer)))) |
059ec3d9 | 1807 | { |
89583014 | 1808 | callout_opt_t * op; |
438257ba | 1809 | double period = 1.0F; |
059ec3d9 | 1810 | |
89583014 | 1811 | for (op= callout_opt_list; op->name; op++) |
438257ba | 1812 | if (strncmpic(opt, op->name, Ustrlen(op->name)) == 0) |
89583014 | 1813 | break; |
059ec3d9 | 1814 | |
89583014 JH |
1815 | verify_options |= op->flag; |
1816 | if (op->has_option) | |
1817 | { | |
438257ba | 1818 | opt += Ustrlen(op->name); |
4deaf07d PH |
1819 | while (isspace(*opt)) opt++; |
1820 | if (*opt++ != '=') | |
1821 | { | |
1822 | *log_msgptr = string_sprintf("'=' expected after " | |
89583014 | 1823 | "\"%s\" in ACL verify condition \"%s\"", op->name, arg); |
4deaf07d PH |
1824 | return ERROR; |
1825 | } | |
1826 | while (isspace(*opt)) opt++; | |
89583014 | 1827 | } |
57cc2785 | 1828 | if (op->timeval && (period = readconf_readtime(opt, 0, FALSE)) < 0) |
89583014 | 1829 | { |
57cc2785 JH |
1830 | *log_msgptr = string_sprintf("bad time value in ACL condition " |
1831 | "\"verify %s\"", arg); | |
1832 | return ERROR; | |
89583014 JH |
1833 | } |
1834 | ||
1835 | switch(op->value) | |
1836 | { | |
1837 | case CALLOUT_DEFER_OK: callout_defer_ok = TRUE; break; | |
1838 | case CALLOUT_POSTMASTER: pm_mailfrom = US""; break; | |
1839 | case CALLOUT_FULLPOSTMASTER: pm_mailfrom = US""; break; | |
1840 | case CALLOUT_MAILFROM: | |
1841 | if (!verify_header_sender) | |
1842 | { | |
1843 | *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a " | |
1844 | "callout option only for verify=header_sender (detected in ACL " | |
1845 | "condition \"%s\")", arg); | |
1846 | return ERROR; | |
1847 | } | |
1848 | se_mailfrom = string_copy(opt); | |
1849 | break; | |
1850 | case CALLOUT_POSTMASTER_MAILFROM: pm_mailfrom = string_copy(opt); break; | |
1851 | case CALLOUT_MAXWAIT: callout_overall = period; break; | |
1852 | case CALLOUT_CONNECT: callout_connect = period; break; | |
1853 | case CALLOUT_TIME: callout = period; break; | |
1854 | } | |
059ec3d9 PH |
1855 | } |
1856 | } | |
1857 | else | |
1858 | { | |
1859 | *log_msgptr = string_sprintf("'=' expected after \"callout\" in " | |
1860 | "ACL condition \"%s\"", arg); | |
1861 | return ERROR; | |
1862 | } | |
1863 | } | |
1864 | } | |
1865 | ||
1866 | /* Option not recognized */ | |
1867 | ||
1868 | else | |
1869 | { | |
1870 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " | |
1871 | "condition \"verify %s\"", ss, arg); | |
1872 | return ERROR; | |
1873 | } | |
1874 | } | |
1875 | ||
1876 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == | |
1877 | (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1878 | { | |
1879 | *log_msgptr = US"only one of use_sender and use_postmaster can be set " | |
1880 | "for a recipient callout"; | |
1881 | return ERROR; | |
1882 | } | |
1883 | ||
1884 | /* Handle sender-in-header verification. Default the user message to the log | |
1885 | message if giving out verification details. */ | |
1886 | ||
1887 | if (verify_header_sender) | |
1888 | { | |
8e669ac1 | 1889 | int verrno; |
2f682e45 JH |
1890 | |
1891 | if ((rc = verify_check_header_address(user_msgptr, log_msgptr, callout, | |
fe5b5d0b | 1892 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, verify_options, |
2f682e45 | 1893 | &verrno)) != OK) |
8e669ac1 | 1894 | { |
fe5b5d0b PH |
1895 | *basic_errno = verrno; |
1896 | if (smtp_return_error_details) | |
1897 | { | |
2f682e45 | 1898 | if (!*user_msgptr && *log_msgptr) |
fe5b5d0b PH |
1899 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); |
1900 | if (rc == DEFER) acl_temp_details = TRUE; | |
1901 | } | |
8e669ac1 | 1902 | } |
059ec3d9 PH |
1903 | } |
1904 | ||
1905 | /* Handle a sender address. The default is to verify *the* sender address, but | |
1906 | optionally a different address can be given, for special requirements. If the | |
1907 | address is empty, we are dealing with a bounce message that has no sender, so | |
1908 | we cannot do any checking. If the real sender address gets rewritten during | |
1909 | verification (e.g. DNS widening), set the flag to stop it being rewritten again | |
1910 | during message reception. | |
1911 | ||
1912 | A list of verified "sender" addresses is kept to try to avoid doing to much | |
1913 | work repetitively when there are multiple recipients in a message and they all | |
1914 | require sender verification. However, when callouts are involved, it gets too | |
1915 | complicated because different recipients may require different callout options. | |
1916 | Therefore, we always do a full sender verify when any kind of callout is | |
1917 | specified. Caching elsewhere, for instance in the DNS resolver and in the | |
1918 | callout handling, should ensure that this is not terribly inefficient. */ | |
1919 | ||
2f682e45 | 1920 | else if (verify_sender_address) |
059ec3d9 | 1921 | { |
2f682e45 | 1922 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster))) |
059ec3d9 PH |
1923 | { |
1924 | *log_msgptr = US"use_sender or use_postmaster cannot be used for a " | |
1925 | "sender verify callout"; | |
1926 | return ERROR; | |
1927 | } | |
1928 | ||
1929 | sender_vaddr = verify_checked_sender(verify_sender_address); | |
1930 | if (sender_vaddr != NULL && /* Previously checked */ | |
1931 | callout <= 0) /* No callout needed this time */ | |
1932 | { | |
1933 | /* If the "routed" flag is set, it means that routing worked before, so | |
1934 | this check can give OK (the saved return code value, if set, belongs to a | |
1935 | callout that was done previously). If the "routed" flag is not set, routing | |
1936 | must have failed, so we use the saved return code. */ | |
1937 | ||
2f682e45 JH |
1938 | if (testflag(sender_vaddr, af_verify_routed)) |
1939 | rc = OK; | |
1940 | else | |
059ec3d9 PH |
1941 | { |
1942 | rc = sender_vaddr->special_action; | |
1943 | *basic_errno = sender_vaddr->basic_errno; | |
1944 | } | |
e1d04f48 | 1945 | HDEBUG(D_acl) debug_printf_indent("using cached sender verify result\n"); |
059ec3d9 PH |
1946 | } |
1947 | ||
1948 | /* Do a new verification, and cache the result. The cache is used to avoid | |
1949 | verifying the sender multiple times for multiple RCPTs when callouts are not | |
1950 | specified (see comments above). | |
1951 | ||
1952 | The cache is also used on failure to give details in response to the first | |
1953 | RCPT that gets bounced for this reason. However, this can be suppressed by | |
1954 | the no_details option, which sets the flag that says "this detail has already | |
1955 | been sent". The cache normally contains just one address, but there may be | |
1956 | more in esoteric circumstances. */ | |
1957 | ||
1958 | else | |
1959 | { | |
1960 | BOOL routed = TRUE; | |
2a3eea10 | 1961 | uschar *save_address_data = deliver_address_data; |
8e669ac1 | 1962 | |
059ec3d9 | 1963 | sender_vaddr = deliver_make_addr(verify_sender_address, TRUE); |
8c5d388a | 1964 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
1965 | if ((sender_vaddr->prop.utf8_msg = message_smtputf8)) |
1966 | { | |
1967 | sender_vaddr->prop.utf8_downcvt = message_utf8_downconvert == 1; | |
1968 | sender_vaddr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1; | |
1969 | } | |
f358d5e0 | 1970 | #endif |
059ec3d9 PH |
1971 | if (no_details) setflag(sender_vaddr, af_sverify_told); |
1972 | if (verify_sender_address[0] != 0) | |
1973 | { | |
1974 | /* If this is the real sender address, save the unrewritten version | |
1975 | for use later in receive. Otherwise, set a flag so that rewriting the | |
1976 | sender in verify_address() does not update sender_address. */ | |
1977 | ||
1978 | if (verify_sender_address == sender_address) | |
1979 | sender_address_unrewritten = sender_address; | |
1980 | else | |
1981 | verify_options |= vopt_fake_sender; | |
1982 | ||
eafd343b TK |
1983 | if (success_on_redirect) |
1984 | verify_options |= vopt_success_on_redirect; | |
1985 | ||
059ec3d9 PH |
1986 | /* The recipient, qualify, and expn options are never set in |
1987 | verify_options. */ | |
1988 | ||
1989 | rc = verify_address(sender_vaddr, NULL, verify_options, callout, | |
4deaf07d | 1990 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, &routed); |
059ec3d9 | 1991 | |
e1d04f48 | 1992 | HDEBUG(D_acl) debug_printf_indent("----------- end verify ------------\n"); |
059ec3d9 | 1993 | |
2f682e45 JH |
1994 | if (rc != OK) |
1995 | *basic_errno = sender_vaddr->basic_errno; | |
1996 | else | |
1997 | DEBUG(D_acl) | |
1998 | { | |
1999 | if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0) | |
e1d04f48 | 2000 | debug_printf_indent("sender %s verified ok as %s\n", |
2f682e45 JH |
2001 | verify_sender_address, sender_vaddr->address); |
2002 | else | |
e1d04f48 | 2003 | debug_printf_indent("sender %s verified ok\n", |
2f682e45 JH |
2004 | verify_sender_address); |
2005 | } | |
059ec3d9 | 2006 | } |
2f682e45 JH |
2007 | else |
2008 | rc = OK; /* Null sender */ | |
059ec3d9 PH |
2009 | |
2010 | /* Cache the result code */ | |
2011 | ||
2012 | if (routed) setflag(sender_vaddr, af_verify_routed); | |
2013 | if (callout > 0) setflag(sender_vaddr, af_verify_callout); | |
2014 | sender_vaddr->special_action = rc; | |
2015 | sender_vaddr->next = sender_verified_list; | |
2016 | sender_verified_list = sender_vaddr; | |
8e669ac1 PH |
2017 | |
2018 | /* Restore the recipient address data, which might have been clobbered by | |
2a3eea10 | 2019 | the sender verification. */ |
8e669ac1 | 2020 | |
2a3eea10 | 2021 | deliver_address_data = save_address_data; |
059ec3d9 | 2022 | } |
8e669ac1 | 2023 | |
2a3eea10 PH |
2024 | /* Put the sender address_data value into $sender_address_data */ |
2025 | ||
d43cbe25 | 2026 | sender_address_data = sender_vaddr->prop.address_data; |
059ec3d9 PH |
2027 | } |
2028 | ||
2029 | /* A recipient address just gets a straightforward verify; again we must handle | |
2030 | the DEFER overrides. */ | |
2031 | ||
2032 | else | |
2033 | { | |
2034 | address_item addr2; | |
2035 | ||
eafd343b TK |
2036 | if (success_on_redirect) |
2037 | verify_options |= vopt_success_on_redirect; | |
2038 | ||
059ec3d9 PH |
2039 | /* We must use a copy of the address for verification, because it might |
2040 | get rewritten. */ | |
2041 | ||
2042 | addr2 = *addr; | |
2043 | rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout, | |
4deaf07d | 2044 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, NULL); |
e1d04f48 | 2045 | HDEBUG(D_acl) debug_printf_indent("----------- end verify ------------\n"); |
8e669ac1 | 2046 | |
42855d71 | 2047 | *basic_errno = addr2.basic_errno; |
059ec3d9 | 2048 | *log_msgptr = addr2.message; |
8e669ac1 | 2049 | *user_msgptr = (addr2.user_message != NULL)? |
6729cf78 | 2050 | addr2.user_message : addr2.message; |
42855d71 PH |
2051 | |
2052 | /* Allow details for temporary error if the address is so flagged. */ | |
2053 | if (testflag((&addr2), af_pass_message)) acl_temp_details = TRUE; | |
059ec3d9 PH |
2054 | |
2055 | /* Make $address_data visible */ | |
d43cbe25 | 2056 | deliver_address_data = addr2.prop.address_data; |
059ec3d9 PH |
2057 | } |
2058 | ||
2059 | /* We have a result from the relevant test. Handle defer overrides first. */ | |
2060 | ||
2061 | if (rc == DEFER && (defer_ok || | |
2062 | (callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER))) | |
2063 | { | |
e1d04f48 | 2064 | HDEBUG(D_acl) debug_printf_indent("verify defer overridden by %s\n", |
059ec3d9 PH |
2065 | defer_ok? "defer_ok" : "callout_defer_ok"); |
2066 | rc = OK; | |
2067 | } | |
2068 | ||
2069 | /* If we've failed a sender, set up a recipient message, and point | |
2070 | sender_verified_failed to the address item that actually failed. */ | |
2071 | ||
2072 | if (rc != OK && verify_sender_address != NULL) | |
2073 | { | |
2074 | if (rc != DEFER) | |
059ec3d9 | 2075 | *log_msgptr = *user_msgptr = US"Sender verify failed"; |
059ec3d9 | 2076 | else if (*basic_errno != ERRNO_CALLOUTDEFER) |
059ec3d9 | 2077 | *log_msgptr = *user_msgptr = US"Could not complete sender verify"; |
059ec3d9 PH |
2078 | else |
2079 | { | |
2080 | *log_msgptr = US"Could not complete sender verify callout"; | |
2081 | *user_msgptr = smtp_return_error_details? sender_vaddr->user_message : | |
2082 | *log_msgptr; | |
2083 | } | |
2084 | ||
2085 | sender_verified_failed = sender_vaddr; | |
2086 | } | |
2087 | ||
2088 | /* Verifying an address messes up the values of $domain and $local_part, | |
2089 | so reset them before returning if this is a RCPT ACL. */ | |
2090 | ||
2091 | if (addr != NULL) | |
2092 | { | |
2093 | deliver_domain = addr->domain; | |
2094 | deliver_localpart = addr->local_part; | |
2095 | } | |
2096 | return rc; | |
2097 | ||
2098 | /* Syntax errors in the verify argument come here. */ | |
2099 | ||
2100 | BAD_VERIFY: | |
2101 | *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", " | |
770747fd MFM |
2102 | "\"helo\", \"header_syntax\", \"header_sender\", \"header_names_ascii\" " |
2103 | "or \"reverse_host_lookup\" at start of ACL condition " | |
059ec3d9 PH |
2104 | "\"verify %s\"", arg); |
2105 | return ERROR; | |
2106 | } | |
2107 | ||
2108 | ||
2109 | ||
2110 | ||
2111 | /************************************************* | |
2112 | * Check argument for control= modifier * | |
2113 | *************************************************/ | |
2114 | ||
2115 | /* Called from acl_check_condition() below | |
2116 | ||
2117 | Arguments: | |
2118 | arg the argument string for control= | |
2119 | pptr set to point to the terminating character | |
2120 | where which ACL we are in | |
2121 | log_msgptr for error messages | |
2122 | ||
2123 | Returns: CONTROL_xxx value | |
2124 | */ | |
2125 | ||
2126 | static int | |
55414b25 | 2127 | decode_control(const uschar *arg, const uschar **pptr, int where, uschar **log_msgptr) |
059ec3d9 | 2128 | { |
d7bed771 JH |
2129 | int idx, len; |
2130 | control_def * d; | |
059ec3d9 | 2131 | |
d7bed771 JH |
2132 | if ( (idx = find_control(arg, controls_list, nelem(controls_list))) < 0 |
2133 | || ( arg[len = Ustrlen((d = controls_list+idx)->name)] != 0 | |
2134 | && (!d->has_option || arg[len] != '/') | |
2135 | ) ) | |
059ec3d9 PH |
2136 | { |
2137 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2138 | return CONTROL_ERROR; | |
2139 | } | |
2140 | ||
059ec3d9 | 2141 | *pptr = arg + len; |
d7bed771 | 2142 | return idx; |
059ec3d9 PH |
2143 | } |
2144 | ||
2145 | ||
2146 | ||
c99ce5c9 TF |
2147 | |
2148 | /************************************************* | |
2149 | * Return a ratelimit error * | |
2150 | *************************************************/ | |
2151 | ||
2152 | /* Called from acl_ratelimit() below | |
2153 | ||
2154 | Arguments: | |
2155 | log_msgptr for error messages | |
2156 | format format string | |
2157 | ... supplementary arguments | |
2158 | ss ratelimit option name | |
2159 | where ACL_WHERE_xxxx indicating which ACL this is | |
2160 | ||
2161 | Returns: ERROR | |
2162 | */ | |
2163 | ||
2164 | static int | |
2165 | ratelimit_error(uschar **log_msgptr, const char *format, ...) | |
2166 | { | |
2167 | va_list ap; | |
2168 | uschar buffer[STRING_SPRINTF_BUFFER_SIZE]; | |
2169 | va_start(ap, format); | |
2170 | if (!string_vformat(buffer, sizeof(buffer), format, ap)) | |
2171 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
ef840681 | 2172 | "string_sprintf expansion was longer than " SIZE_T_FMT, sizeof(buffer)); |
c99ce5c9 TF |
2173 | va_end(ap); |
2174 | *log_msgptr = string_sprintf( | |
2175 | "error in arguments to \"ratelimit\" condition: %s", buffer); | |
2176 | return ERROR; | |
2177 | } | |
2178 | ||
2179 | ||
2180 | ||
2181 | ||
870f6ba8 TF |
2182 | /************************************************* |
2183 | * Handle rate limiting * | |
2184 | *************************************************/ | |
2185 | ||
2186 | /* Called by acl_check_condition() below to calculate the result | |
2187 | of the ACL ratelimit condition. | |
2188 | ||
2189 | Note that the return value might be slightly unexpected: if the | |
2190 | sender's rate is above the limit then the result is OK. This is | |
2191 | similar to the dnslists condition, and is so that you can write | |
2192 | ACL clauses like: defer ratelimit = 15 / 1h | |
2193 | ||
2194 | Arguments: | |
2195 | arg the option string for ratelimit= | |
90fc3069 | 2196 | where ACL_WHERE_xxxx indicating which ACL this is |
870f6ba8 TF |
2197 | log_msgptr for error messages |
2198 | ||
2199 | Returns: OK - Sender's rate is above limit | |
2200 | FAIL - Sender's rate is below limit | |
2201 | DEFER - Problem opening ratelimit database | |
2202 | ERROR - Syntax error in options. | |
2203 | */ | |
2204 | ||
2205 | static int | |
55414b25 | 2206 | acl_ratelimit(const uschar *arg, int where, uschar **log_msgptr) |
870f6ba8 | 2207 | { |
c99ce5c9 | 2208 | double limit, period, count; |
8f240103 PH |
2209 | uschar *ss; |
2210 | uschar *key = NULL; | |
c99ce5c9 | 2211 | uschar *unique = NULL; |
870f6ba8 | 2212 | int sep = '/'; |
c99ce5c9 TF |
2213 | BOOL leaky = FALSE, strict = FALSE, readonly = FALSE; |
2214 | BOOL noupdate = FALSE, badacl = FALSE; | |
2215 | int mode = RATE_PER_WHAT; | |
870f6ba8 TF |
2216 | int old_pool, rc; |
2217 | tree_node **anchor, *t; | |
2218 | open_db dbblock, *dbm; | |
c99ce5c9 | 2219 | int dbdb_size; |
870f6ba8 | 2220 | dbdata_ratelimit *dbd; |
c99ce5c9 | 2221 | dbdata_ratelimit_unique *dbdb; |
870f6ba8 TF |
2222 | struct timeval tv; |
2223 | ||
2224 | /* Parse the first two options and record their values in expansion | |
2225 | variables. These variables allow the configuration to have informative | |
2226 | error messages based on rate limits obtained from a table lookup. */ | |
2227 | ||
c99ce5c9 | 2228 | /* First is the maximum number of messages per period / maximum burst |
870f6ba8 TF |
2229 | size, which must be greater than or equal to zero. Zero is useful for |
2230 | rate measurement as opposed to rate limiting. */ | |
2231 | ||
2232 | sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0); | |
2233 | if (sender_rate_limit == NULL) | |
96f5fe4c JH |
2234 | return ratelimit_error(log_msgptr, "sender rate limit not set"); |
2235 | ||
2236 | limit = Ustrtod(sender_rate_limit, &ss); | |
2237 | if (tolower(*ss) == 'k') { limit *= 1024.0; ss++; } | |
2238 | else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; } | |
2239 | else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; } | |
2240 | ||
c99ce5c9 TF |
2241 | if (limit < 0.0 || *ss != '\0') |
2242 | return ratelimit_error(log_msgptr, | |
2243 | "\"%s\" is not a positive number", sender_rate_limit); | |
870f6ba8 | 2244 | |
c99ce5c9 | 2245 | /* Second is the rate measurement period / exponential smoothing time |
870f6ba8 TF |
2246 | constant. This must be strictly greater than zero, because zero leads to |
2247 | run-time division errors. */ | |
2248 | ||
2249 | sender_rate_period = string_nextinlist(&arg, &sep, NULL, 0); | |
2250 | if (sender_rate_period == NULL) period = -1.0; | |
2251 | else period = readconf_readtime(sender_rate_period, 0, FALSE); | |
2252 | if (period <= 0.0) | |
c99ce5c9 TF |
2253 | return ratelimit_error(log_msgptr, |
2254 | "\"%s\" is not a time value", sender_rate_period); | |
2255 | ||
2256 | /* By default we are counting one of something, but the per_rcpt, | |
2257 | per_byte, and count options can change this. */ | |
2258 | ||
2259 | count = 1.0; | |
870f6ba8 | 2260 | |
c99ce5c9 | 2261 | /* Parse the other options. */ |
870f6ba8 TF |
2262 | |
2263 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2264 | != NULL) | |
2265 | { | |
2266 | if (strcmpic(ss, US"leaky") == 0) leaky = TRUE; | |
2267 | else if (strcmpic(ss, US"strict") == 0) strict = TRUE; | |
8f240103 | 2268 | else if (strcmpic(ss, US"noupdate") == 0) noupdate = TRUE; |
c99ce5c9 TF |
2269 | else if (strcmpic(ss, US"readonly") == 0) readonly = TRUE; |
2270 | else if (strcmpic(ss, US"per_cmd") == 0) RATE_SET(mode, PER_CMD); | |
2271 | else if (strcmpic(ss, US"per_conn") == 0) | |
2272 | { | |
2273 | RATE_SET(mode, PER_CONN); | |
2274 | if (where == ACL_WHERE_NOTSMTP || where == ACL_WHERE_NOTSMTP_START) | |
2275 | badacl = TRUE; | |
2276 | } | |
2277 | else if (strcmpic(ss, US"per_mail") == 0) | |
2278 | { | |
2279 | RATE_SET(mode, PER_MAIL); | |
2280 | if (where > ACL_WHERE_NOTSMTP) badacl = TRUE; | |
2281 | } | |
2282 | else if (strcmpic(ss, US"per_rcpt") == 0) | |
2283 | { | |
2284 | /* If we are running in the RCPT ACL, then we'll count the recipients | |
2285 | one by one, but if we are running when we have accumulated the whole | |
2286 | list then we'll add them all in one batch. */ | |
2287 | if (where == ACL_WHERE_RCPT) | |
2288 | RATE_SET(mode, PER_RCPT); | |
2289 | else if (where >= ACL_WHERE_PREDATA && where <= ACL_WHERE_NOTSMTP) | |
2290 | RATE_SET(mode, PER_ALLRCPTS), count = (double)recipients_count; | |
2291 | else if (where == ACL_WHERE_MAIL || where > ACL_WHERE_NOTSMTP) | |
2292 | RATE_SET(mode, PER_RCPT), badacl = TRUE; | |
2293 | } | |
2294 | else if (strcmpic(ss, US"per_byte") == 0) | |
2295 | { | |
2296 | /* If we have not yet received the message data and there was no SIZE | |
4c04137d | 2297 | declaration on the MAIL command, then it's safe to just use a value of |
c99ce5c9 TF |
2298 | zero and let the recorded rate decay as if nothing happened. */ |
2299 | RATE_SET(mode, PER_MAIL); | |
2300 | if (where > ACL_WHERE_NOTSMTP) badacl = TRUE; | |
2301 | else count = message_size < 0 ? 0.0 : (double)message_size; | |
2302 | } | |
2303 | else if (strcmpic(ss, US"per_addr") == 0) | |
2304 | { | |
2305 | RATE_SET(mode, PER_RCPT); | |
438257ba | 2306 | if (where != ACL_WHERE_RCPT) badacl = TRUE, unique = US"*"; |
c99ce5c9 TF |
2307 | else unique = string_sprintf("%s@%s", deliver_localpart, deliver_domain); |
2308 | } | |
2309 | else if (strncmpic(ss, US"count=", 6) == 0) | |
2310 | { | |
2311 | uschar *e; | |
2312 | count = Ustrtod(ss+6, &e); | |
2313 | if (count < 0.0 || *e != '\0') | |
2314 | return ratelimit_error(log_msgptr, | |
2315 | "\"%s\" is not a positive number", ss); | |
2316 | } | |
2317 | else if (strncmpic(ss, US"unique=", 7) == 0) | |
2318 | unique = string_copy(ss + 7); | |
2319 | else if (key == NULL) | |
2320 | key = string_copy(ss); | |
2321 | else | |
2322 | key = string_sprintf("%s/%s", key, ss); | |
870f6ba8 TF |
2323 | } |
2324 | ||
c99ce5c9 TF |
2325 | /* Sanity check. When the badacl flag is set the update mode must either |
2326 | be readonly (which is the default if it is omitted) or, for backwards | |
2327 | compatibility, a combination of noupdate and strict or leaky. */ | |
2328 | ||
2329 | if (mode == RATE_PER_CLASH) | |
2330 | return ratelimit_error(log_msgptr, "conflicting per_* options"); | |
2331 | if (leaky + strict + readonly > 1) | |
2332 | return ratelimit_error(log_msgptr, "conflicting update modes"); | |
2333 | if (badacl && (leaky || strict) && !noupdate) | |
2334 | return ratelimit_error(log_msgptr, | |
2335 | "\"%s\" must not have /leaky or /strict option in %s ACL", | |
2336 | ratelimit_option_string[mode], acl_wherenames[where]); | |
2337 | ||
2338 | /* Set the default values of any unset options. In readonly mode we | |
2339 | perform the rate computation without any increment so that its value | |
2340 | decays to eventually allow over-limit senders through. */ | |
2341 | ||
2342 | if (noupdate) readonly = TRUE, leaky = strict = FALSE; | |
2343 | if (badacl) readonly = TRUE; | |
2344 | if (readonly) count = 0.0; | |
2345 | if (!strict && !readonly) leaky = TRUE; | |
2346 | if (mode == RATE_PER_WHAT) mode = RATE_PER_MAIL; | |
870f6ba8 | 2347 | |
8f240103 PH |
2348 | /* Create the lookup key. If there is no explicit key, use sender_host_address. |
2349 | If there is no sender_host_address (e.g. -bs or acl_not_smtp) then we simply | |
2350 | omit it. The smoothing constant (sender_rate_period) and the per_xxx options | |
2351 | are added to the key because they alter the meaning of the stored data. */ | |
2352 | ||
2353 | if (key == NULL) | |
2354 | key = (sender_host_address == NULL)? US"" : sender_host_address; | |
870f6ba8 | 2355 | |
c99ce5c9 | 2356 | key = string_sprintf("%s/%s/%s%s", |
8f240103 | 2357 | sender_rate_period, |
c99ce5c9 TF |
2358 | ratelimit_option_string[mode], |
2359 | unique == NULL ? "" : "unique/", | |
8f240103 | 2360 | key); |
870f6ba8 | 2361 | |
c99ce5c9 | 2362 | HDEBUG(D_acl) |
e1d04f48 | 2363 | debug_printf_indent("ratelimit condition count=%.0f %.1f/%s\n", count, limit, key); |
870f6ba8 | 2364 | |
8f240103 PH |
2365 | /* See if we have already computed the rate by looking in the relevant tree. |
2366 | For per-connection rate limiting, store tree nodes and dbdata in the permanent | |
c99ce5c9 TF |
2367 | pool so that they survive across resets. In readonly mode we only remember the |
2368 | result for the rest of this command in case a later command changes it. After | |
2369 | this bit of logic the code is independent of the per_* mode. */ | |
870f6ba8 | 2370 | |
870f6ba8 TF |
2371 | old_pool = store_pool; |
2372 | ||
c99ce5c9 TF |
2373 | if (readonly) |
2374 | anchor = &ratelimiters_cmd; | |
2375 | else switch(mode) { | |
2376 | case RATE_PER_CONN: | |
870f6ba8 TF |
2377 | anchor = &ratelimiters_conn; |
2378 | store_pool = POOL_PERM; | |
c99ce5c9 TF |
2379 | break; |
2380 | case RATE_PER_BYTE: | |
2381 | case RATE_PER_MAIL: | |
2382 | case RATE_PER_ALLRCPTS: | |
870f6ba8 | 2383 | anchor = &ratelimiters_mail; |
c99ce5c9 TF |
2384 | break; |
2385 | case RATE_PER_ADDR: | |
2386 | case RATE_PER_CMD: | |
2387 | case RATE_PER_RCPT: | |
fe0dab11 | 2388 | anchor = &ratelimiters_cmd; |
c99ce5c9 TF |
2389 | break; |
2390 | default: | |
3399bb60 | 2391 | anchor = NULL; /* silence an "unused" complaint */ |
c99ce5c9 TF |
2392 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, |
2393 | "internal ACL error: unknown ratelimit mode %d", mode); | |
2394 | break; | |
2395 | } | |
870f6ba8 | 2396 | |
c99ce5c9 TF |
2397 | t = tree_search(*anchor, key); |
2398 | if (t != NULL) | |
870f6ba8 TF |
2399 | { |
2400 | dbd = t->data.ptr; | |
2401 | /* The following few lines duplicate some of the code below. */ | |
8f240103 | 2402 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2403 | store_pool = old_pool; |
2404 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2405 | HDEBUG(D_acl) | |
e1d04f48 | 2406 | debug_printf_indent("ratelimit found pre-computed rate %s\n", sender_rate); |
870f6ba8 TF |
2407 | return rc; |
2408 | } | |
2409 | ||
c99ce5c9 TF |
2410 | /* We aren't using a pre-computed rate, so get a previously recorded rate |
2411 | from the database, which will be updated and written back if required. */ | |
870f6ba8 | 2412 | |
0a6c178c | 2413 | if (!(dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE))) |
870f6ba8 TF |
2414 | { |
2415 | store_pool = old_pool; | |
2416 | sender_rate = NULL; | |
e1d04f48 | 2417 | HDEBUG(D_acl) debug_printf_indent("ratelimit database not available\n"); |
870f6ba8 TF |
2418 | *log_msgptr = US"ratelimit database not available"; |
2419 | return DEFER; | |
2420 | } | |
c99ce5c9 TF |
2421 | dbdb = dbfn_read_with_length(dbm, key, &dbdb_size); |
2422 | dbd = NULL; | |
870f6ba8 TF |
2423 | |
2424 | gettimeofday(&tv, NULL); | |
2425 | ||
c99ce5c9 TF |
2426 | if (dbdb != NULL) |
2427 | { | |
2428 | /* Locate the basic ratelimit block inside the DB data. */ | |
e1d04f48 | 2429 | HDEBUG(D_acl) debug_printf_indent("ratelimit found key in database\n"); |
c99ce5c9 TF |
2430 | dbd = &dbdb->dbd; |
2431 | ||
2432 | /* Forget the old Bloom filter if it is too old, so that we count each | |
2433 | repeating event once per period. We don't simply clear and re-use the old | |
2434 | filter because we want its size to change if the limit changes. Note that | |
2435 | we keep the dbd pointer for copying the rate into the new data block. */ | |
2436 | ||
2437 | if(unique != NULL && tv.tv_sec > dbdb->bloom_epoch + period) | |
2438 | { | |
e1d04f48 | 2439 | HDEBUG(D_acl) debug_printf_indent("ratelimit discarding old Bloom filter\n"); |
c99ce5c9 TF |
2440 | dbdb = NULL; |
2441 | } | |
2442 | ||
2443 | /* Sanity check. */ | |
2444 | ||
2445 | if(unique != NULL && dbdb_size < sizeof(*dbdb)) | |
2446 | { | |
e1d04f48 | 2447 | HDEBUG(D_acl) debug_printf_indent("ratelimit discarding undersize Bloom filter\n"); |
c99ce5c9 TF |
2448 | dbdb = NULL; |
2449 | } | |
2450 | } | |
2451 | ||
2452 | /* Allocate a new data block if the database lookup failed | |
2453 | or the Bloom filter passed its age limit. */ | |
2454 | ||
2455 | if (dbdb == NULL) | |
2456 | { | |
2457 | if (unique == NULL) | |
2458 | { | |
2459 | /* No Bloom filter. This basic ratelimit block is initialized below. */ | |
e1d04f48 | 2460 | HDEBUG(D_acl) debug_printf_indent("ratelimit creating new rate data block\n"); |
c99ce5c9 TF |
2461 | dbdb_size = sizeof(*dbd); |
2462 | dbdb = store_get(dbdb_size); | |
2463 | } | |
2464 | else | |
2465 | { | |
2466 | int extra; | |
e1d04f48 | 2467 | HDEBUG(D_acl) debug_printf_indent("ratelimit creating new Bloom filter\n"); |
c99ce5c9 TF |
2468 | |
2469 | /* See the long comment below for an explanation of the magic number 2. | |
2470 | The filter has a minimum size in case the rate limit is very small; | |
2471 | this is determined by the definition of dbdata_ratelimit_unique. */ | |
2472 | ||
2473 | extra = (int)limit * 2 - sizeof(dbdb->bloom); | |
2474 | if (extra < 0) extra = 0; | |
2475 | dbdb_size = sizeof(*dbdb) + extra; | |
2476 | dbdb = store_get(dbdb_size); | |
2477 | dbdb->bloom_epoch = tv.tv_sec; | |
2478 | dbdb->bloom_size = sizeof(dbdb->bloom) + extra; | |
2479 | memset(dbdb->bloom, 0, dbdb->bloom_size); | |
2480 | ||
2481 | /* Preserve any basic ratelimit data (which is our longer-term memory) | |
2482 | by copying it from the discarded block. */ | |
2483 | ||
2484 | if (dbd != NULL) | |
2485 | { | |
2486 | dbdb->dbd = *dbd; | |
2487 | dbd = &dbdb->dbd; | |
2488 | } | |
2489 | } | |
2490 | } | |
2491 | ||
2492 | /* If we are counting unique events, find out if this event is new or not. | |
2493 | If the client repeats the event during the current period then it should be | |
2494 | counted. We skip this code in readonly mode for efficiency, because any | |
2495 | changes to the filter will be discarded and because count is already set to | |
2496 | zero. */ | |
2497 | ||
2498 | if (unique != NULL && !readonly) | |
2499 | { | |
2500 | /* We identify unique events using a Bloom filter. (You can find my | |
2501 | notes on Bloom filters at http://fanf.livejournal.com/81696.html) | |
2502 | With the per_addr option, an "event" is a recipient address, though the | |
2503 | user can use the unique option to define their own events. We only count | |
2504 | an event if we have not seen it before. | |
2505 | ||
2506 | We size the filter according to the rate limit, which (in leaky mode) | |
2507 | is the limit on the population of the filter. We allow 16 bits of space | |
2508 | per entry (see the construction code above) and we set (up to) 8 of them | |
2509 | when inserting an element (see the loop below). The probability of a false | |
2510 | positive (an event we have not seen before but which we fail to count) is | |
2511 | ||
2512 | size = limit * 16 | |
2513 | numhash = 8 | |
2514 | allzero = exp(-numhash * pop / size) | |
2515 | = exp(-0.5 * pop / limit) | |
2516 | fpr = pow(1 - allzero, numhash) | |
2517 | ||
2518 | For senders at the limit the fpr is 0.06% or 1 in 1700 | |
2519 | and for senders at half the limit it is 0.0006% or 1 in 170000 | |
2520 | ||
2521 | In strict mode the Bloom filter can fill up beyond the normal limit, in | |
2522 | which case the false positive rate will rise. This means that the | |
2523 | measured rate for very fast senders can bogusly drop off after a while. | |
2524 | ||
2525 | At twice the limit, the fpr is 2.5% or 1 in 40 | |
2526 | At four times the limit, it is 31% or 1 in 3.2 | |
2527 | ||
2528 | It takes ln(pop/limit) periods for an over-limit burst of pop events to | |
2529 | decay below the limit, and if this is more than one then the Bloom filter | |
2530 | will be discarded before the decay gets that far. The false positive rate | |
2531 | at this threshold is 9.3% or 1 in 10.7. */ | |
2532 | ||
2533 | BOOL seen; | |
2534 | unsigned n, hash, hinc; | |
2535 | uschar md5sum[16]; | |
2536 | md5 md5info; | |
2537 | ||
2538 | /* Instead of using eight independent hash values, we combine two values | |
2539 | using the formula h1 + n * h2. This does not harm the Bloom filter's | |
2540 | performance, and means the amount of hash we need is independent of the | |
2541 | number of bits we set in the filter. */ | |
2542 | ||
2543 | md5_start(&md5info); | |
2544 | md5_end(&md5info, unique, Ustrlen(unique), md5sum); | |
2545 | hash = md5sum[0] | md5sum[1] << 8 | md5sum[2] << 16 | md5sum[3] << 24; | |
2546 | hinc = md5sum[4] | md5sum[5] << 8 | md5sum[6] << 16 | md5sum[7] << 24; | |
2547 | ||
2548 | /* Scan the bits corresponding to this event. A zero bit means we have | |
2549 | not seen it before. Ensure all bits are set to record this event. */ | |
2550 | ||
e1d04f48 | 2551 | HDEBUG(D_acl) debug_printf_indent("ratelimit checking uniqueness of %s\n", unique); |
c99ce5c9 TF |
2552 | |
2553 | seen = TRUE; | |
2554 | for (n = 0; n < 8; n++, hash += hinc) | |
2555 | { | |
2556 | int bit = 1 << (hash % 8); | |
2557 | int byte = (hash / 8) % dbdb->bloom_size; | |
2558 | if ((dbdb->bloom[byte] & bit) == 0) | |
2559 | { | |
2560 | dbdb->bloom[byte] |= bit; | |
2561 | seen = FALSE; | |
2562 | } | |
2563 | } | |
2564 | ||
2565 | /* If this event has occurred before, do not count it. */ | |
2566 | ||
2567 | if (seen) | |
2568 | { | |
e1d04f48 | 2569 | HDEBUG(D_acl) debug_printf_indent("ratelimit event found in Bloom filter\n"); |
c99ce5c9 TF |
2570 | count = 0.0; |
2571 | } | |
2572 | else | |
e1d04f48 | 2573 | HDEBUG(D_acl) debug_printf_indent("ratelimit event added to Bloom filter\n"); |
c99ce5c9 TF |
2574 | } |
2575 | ||
2576 | /* If there was no previous ratelimit data block for this key, initialize | |
2577 | the new one, otherwise update the block from the database. The initial rate | |
2578 | is what would be computed by the code below for an infinite interval. */ | |
2579 | ||
870f6ba8 TF |
2580 | if (dbd == NULL) |
2581 | { | |
e1d04f48 | 2582 | HDEBUG(D_acl) debug_printf_indent("ratelimit initializing new key's rate data\n"); |
c99ce5c9 | 2583 | dbd = &dbdb->dbd; |
870f6ba8 TF |
2584 | dbd->time_stamp = tv.tv_sec; |
2585 | dbd->time_usec = tv.tv_usec; | |
c99ce5c9 | 2586 | dbd->rate = count; |
870f6ba8 TF |
2587 | } |
2588 | else | |
2589 | { | |
2590 | /* The smoothed rate is computed using an exponentially weighted moving | |
2591 | average adjusted for variable sampling intervals. The standard EWMA for | |
2592 | a fixed sampling interval is: f'(t) = (1 - a) * f(t) + a * f'(t - 1) | |
2593 | where f() is the measured value and f'() is the smoothed value. | |
2594 | ||
2595 | Old data decays out of the smoothed value exponentially, such that data n | |
2596 | samples old is multiplied by a^n. The exponential decay time constant p | |
2597 | is defined such that data p samples old is multiplied by 1/e, which means | |
2598 | that a = exp(-1/p). We can maintain the same time constant for a variable | |
2599 | sampling interval i by using a = exp(-i/p). | |
2600 | ||
2601 | The rate we are measuring is messages per period, suitable for directly | |
2602 | comparing with the limit. The average rate between now and the previous | |
2603 | message is period / interval, which we feed into the EWMA as the sample. | |
2604 | ||
2605 | It turns out that the number of messages required for the smoothed rate | |
2606 | to reach the limit when they are sent in a burst is equal to the limit. | |
2607 | This can be seen by analysing the value of the smoothed rate after N | |
2608 | messages sent at even intervals. Let k = (1 - a) * p/i | |
2609 | ||
2610 | rate_1 = (1 - a) * p/i + a * rate_0 | |
2611 | = k + a * rate_0 | |
2612 | rate_2 = k + a * rate_1 | |
2613 | = k + a * k + a^2 * rate_0 | |
2614 | rate_3 = k + a * k + a^2 * k + a^3 * rate_0 | |
2615 | rate_N = rate_0 * a^N + k * SUM(x=0..N-1)(a^x) | |
2616 | = rate_0 * a^N + k * (1 - a^N) / (1 - a) | |
2617 | = rate_0 * a^N + p/i * (1 - a^N) | |
2618 | ||
2619 | When N is large, a^N -> 0 so rate_N -> p/i as desired. | |
2620 | ||
2621 | rate_N = p/i + (rate_0 - p/i) * a^N | |
2622 | a^N = (rate_N - p/i) / (rate_0 - p/i) | |
2623 | N * -i/p = log((rate_N - p/i) / (rate_0 - p/i)) | |
2624 | N = p/i * log((rate_0 - p/i) / (rate_N - p/i)) | |
2625 | ||
2626 | Numerical analysis of the above equation, setting the computed rate to | |
2627 | increase from rate_0 = 0 to rate_N = limit, shows that for large sending | |
2628 | rates, p/i, the number of messages N = limit. So limit serves as both the | |
2629 | maximum rate measured in messages per period, and the maximum number of | |
2630 | messages that can be sent in a fast burst. */ | |
2631 | ||
2632 | double this_time = (double)tv.tv_sec | |
2633 | + (double)tv.tv_usec / 1000000.0; | |
2634 | double prev_time = (double)dbd->time_stamp | |
2635 | + (double)dbd->time_usec / 1000000.0; | |
870f6ba8 TF |
2636 | |
2637 | /* We must avoid division by zero, and deal gracefully with the clock going | |
2638 | backwards. If we blunder ahead when time is in reverse then the computed | |
e5d5a95f | 2639 | rate will be bogus. To be safe we clamp interval to a very small number. */ |
870f6ba8 | 2640 | |
e5d5a95f TF |
2641 | double interval = this_time - prev_time <= 0.0 ? 1e-9 |
2642 | : this_time - prev_time; | |
2643 | ||
2644 | double i_over_p = interval / period; | |
2645 | double a = exp(-i_over_p); | |
870f6ba8 | 2646 | |
c99ce5c9 TF |
2647 | /* Combine the instantaneous rate (period / interval) with the previous rate |
2648 | using the smoothing factor a. In order to measure sized events, multiply the | |
2649 | instantaneous rate by the count of bytes or recipients etc. */ | |
2650 | ||
870f6ba8 TF |
2651 | dbd->time_stamp = tv.tv_sec; |
2652 | dbd->time_usec = tv.tv_usec; | |
c99ce5c9 TF |
2653 | dbd->rate = (1 - a) * count / i_over_p + a * dbd->rate; |
2654 | ||
2655 | /* When events are very widely spaced the computed rate tends towards zero. | |
2656 | Although this is accurate it turns out not to be useful for our purposes, | |
2657 | especially when the first event after a long silence is the start of a spam | |
2658 | run. A more useful model is that the rate for an isolated event should be the | |
2659 | size of the event per the period size, ignoring the lack of events outside | |
2660 | the current period and regardless of where the event falls in the period. So, | |
2661 | if the interval was so long that the calculated rate is unhelpfully small, we | |
4c04137d | 2662 | re-initialize the rate. In the absence of higher-rate bursts, the condition |
c99ce5c9 TF |
2663 | below is true if the interval is greater than the period. */ |
2664 | ||
2665 | if (dbd->rate < count) dbd->rate = count; | |
870f6ba8 TF |
2666 | } |
2667 | ||
c99ce5c9 TF |
2668 | /* Clients sending at the limit are considered to be over the limit. |
2669 | This matters for edge cases such as a limit of zero, when the client | |
2670 | should be completely blocked. */ | |
3348576f | 2671 | |
8f240103 | 2672 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2673 | |
2674 | /* Update the state if the rate is low or if we are being strict. If we | |
2675 | are in leaky mode and the sender's rate is too high, we do not update | |
2676 | the recorded rate in order to avoid an over-aggressive sender's retry | |
c99ce5c9 TF |
2677 | rate preventing them from getting any email through. If readonly is set, |
2678 | neither leaky nor strict are set, so we do not do any updates. */ | |
870f6ba8 | 2679 | |
c99ce5c9 | 2680 | if ((rc == FAIL && leaky) || strict) |
8f240103 | 2681 | { |
c99ce5c9 | 2682 | dbfn_write(dbm, key, dbdb, dbdb_size); |
e1d04f48 | 2683 | HDEBUG(D_acl) debug_printf_indent("ratelimit db updated\n"); |
8f240103 PH |
2684 | } |
2685 | else | |
2686 | { | |
e1d04f48 | 2687 | HDEBUG(D_acl) debug_printf_indent("ratelimit db not updated: %s\n", |
c99ce5c9 | 2688 | readonly? "readonly mode" : "over the limit, but leaky"); |
8f240103 PH |
2689 | } |
2690 | ||
870f6ba8 TF |
2691 | dbfn_close(dbm); |
2692 | ||
c99ce5c9 | 2693 | /* Store the result in the tree for future reference. */ |
870f6ba8 | 2694 | |
c99ce5c9 TF |
2695 | t = store_get(sizeof(tree_node) + Ustrlen(key)); |
2696 | t->data.ptr = dbd; | |
2697 | Ustrcpy(t->name, key); | |
2698 | (void)tree_insertnode(anchor, t); | |
870f6ba8 TF |
2699 | |
2700 | /* We create the formatted version of the sender's rate very late in | |
2701 | order to ensure that it is done using the correct storage pool. */ | |
2702 | ||
2703 | store_pool = old_pool; | |
2704 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2705 | ||
2706 | HDEBUG(D_acl) | |
e1d04f48 | 2707 | debug_printf_indent("ratelimit computed rate %s\n", sender_rate); |
870f6ba8 TF |
2708 | |
2709 | return rc; | |
2710 | } | |
2711 | ||
2712 | ||
2713 | ||
b0019c78 TF |
2714 | /************************************************* |
2715 | * The udpsend ACL modifier * | |
2716 | *************************************************/ | |
2717 | ||
2718 | /* Called by acl_check_condition() below. | |
2719 | ||
2720 | Arguments: | |
2721 | arg the option string for udpsend= | |
2722 | log_msgptr for error messages | |
2723 | ||
2724 | Returns: OK - Completed. | |
2725 | DEFER - Problem with DNS lookup. | |
2726 | ERROR - Syntax error in options. | |
2727 | */ | |
2728 | ||
2729 | static int | |
55414b25 | 2730 | acl_udpsend(const uschar *arg, uschar **log_msgptr) |
b0019c78 TF |
2731 | { |
2732 | int sep = 0; | |
2733 | uschar *hostname; | |
2734 | uschar *portstr; | |
2735 | uschar *portend; | |
2736 | host_item *h; | |
2737 | int portnum; | |
b0019c78 TF |
2738 | int len; |
2739 | int r, s; | |
b1f8e4f8 | 2740 | uschar * errstr; |
b0019c78 TF |
2741 | |
2742 | hostname = string_nextinlist(&arg, &sep, NULL, 0); | |
2743 | portstr = string_nextinlist(&arg, &sep, NULL, 0); | |
2744 | ||
f5d25c2b | 2745 | if (!hostname) |
b0019c78 | 2746 | { |
217b0e56 | 2747 | *log_msgptr = US"missing destination host in \"udpsend\" modifier"; |
b0019c78 TF |
2748 | return ERROR; |
2749 | } | |
f5d25c2b | 2750 | if (!portstr) |
b0019c78 | 2751 | { |
217b0e56 | 2752 | *log_msgptr = US"missing destination port in \"udpsend\" modifier"; |
b0019c78 TF |
2753 | return ERROR; |
2754 | } | |
f5d25c2b | 2755 | if (!arg) |
b0019c78 | 2756 | { |
217b0e56 | 2757 | *log_msgptr = US"missing datagram payload in \"udpsend\" modifier"; |
b0019c78 TF |
2758 | return ERROR; |
2759 | } | |
2760 | portnum = Ustrtol(portstr, &portend, 10); | |
2761 | if (*portend != '\0') | |
2762 | { | |
217b0e56 | 2763 | *log_msgptr = US"bad destination port in \"udpsend\" modifier"; |
b0019c78 TF |
2764 | return ERROR; |
2765 | } | |
2766 | ||
2767 | /* Make a single-item host list. */ | |
2768 | h = store_get(sizeof(host_item)); | |
2769 | memset(h, 0, sizeof(host_item)); | |
2770 | h->name = hostname; | |
2771 | h->port = portnum; | |
2772 | h->mx = MX_NONE; | |
2773 | ||
2774 | if (string_is_ip_address(hostname, NULL)) | |
2775 | h->address = hostname, r = HOST_FOUND; | |
2776 | else | |
2777 | r = host_find_byname(h, NULL, 0, NULL, FALSE); | |
2778 | if (r == HOST_FIND_FAILED || r == HOST_FIND_AGAIN) | |
2779 | { | |
217b0e56 | 2780 | *log_msgptr = US"DNS lookup failed in \"udpsend\" modifier"; |
b0019c78 TF |
2781 | return DEFER; |
2782 | } | |
2783 | ||
2784 | HDEBUG(D_acl) | |
e1d04f48 | 2785 | debug_printf_indent("udpsend [%s]:%d %s\n", h->address, portnum, arg); |
b0019c78 | 2786 | |
4a5cbaff | 2787 | /*XXX this could better use sendto */ |
b1f8e4f8 | 2788 | r = s = ip_connectedsocket(SOCK_DGRAM, h->address, portnum, portnum, |
4a5cbaff | 2789 | 1, NULL, &errstr, NULL); |
b0019c78 | 2790 | if (r < 0) goto defer; |
27f9999e | 2791 | len = Ustrlen(arg); |
9cb1785a | 2792 | r = send(s, arg, len, 0); |
b1f8e4f8 JH |
2793 | if (r < 0) |
2794 | { | |
2795 | errstr = US strerror(errno); | |
2796 | close(s); | |
2797 | goto defer; | |
2798 | } | |
2799 | close(s); | |
b0019c78 TF |
2800 | if (r < len) |
2801 | { | |
2802 | *log_msgptr = | |
2803 | string_sprintf("\"udpsend\" truncated from %d to %d octets", len, r); | |
2804 | return DEFER; | |
2805 | } | |
2806 | ||
2807 | HDEBUG(D_acl) | |
e1d04f48 | 2808 | debug_printf_indent("udpsend %d bytes\n", r); |
b0019c78 TF |
2809 | |
2810 | return OK; | |
2811 | ||
2812 | defer: | |
b1f8e4f8 | 2813 | *log_msgptr = string_sprintf("\"udpsend\" failed: %s", errstr); |
b0019c78 TF |
2814 | return DEFER; |
2815 | } | |
2816 | ||
2817 | ||
2818 | ||
059ec3d9 PH |
2819 | /************************************************* |
2820 | * Handle conditions/modifiers on an ACL item * | |
2821 | *************************************************/ | |
2822 | ||
2823 | /* Called from acl_check() below. | |
2824 | ||
2825 | Arguments: | |
2826 | verb ACL verb | |
2827 | cb ACL condition block - if NULL, result is OK | |
2828 | where where called from | |
2829 | addr the address being checked for RCPT, or NULL | |
2830 | level the nesting level | |
2831 | epp pointer to pass back TRUE if "endpass" encountered | |
2832 | (applies only to "accept" and "discard") | |
2833 | user_msgptr user message pointer | |
2834 | log_msgptr log message pointer | |
2835 | basic_errno pointer to where to put verify error | |
2836 | ||
2837 | Returns: OK - all conditions are met | |
2838 | DISCARD - an "acl" condition returned DISCARD - only allowed | |
2839 | for "accept" or "discard" verbs | |
2840 | FAIL - at least one condition fails | |
2841 | FAIL_DROP - an "acl" condition returned FAIL_DROP | |
2842 | DEFER - can't tell at the moment (typically, lookup defer, | |
2843 | but can be temporary callout problem) | |
2844 | ERROR - ERROR from nested ACL or expansion failure or other | |
2845 | error | |
2846 | */ | |
2847 | ||
2848 | static int | |
2849 | acl_check_condition(int verb, acl_condition_block *cb, int where, | |
2850 | address_item *addr, int level, BOOL *epp, uschar **user_msgptr, | |
2851 | uschar **log_msgptr, int *basic_errno) | |
2852 | { | |
2853 | uschar *user_message = NULL; | |
2854 | uschar *log_message = NULL; | |
059ec3d9 | 2855 | int rc = OK; |
8523533c | 2856 | #ifdef WITH_CONTENT_SCAN |
0f0c8159 | 2857 | int sep = -'/'; |
8523533c | 2858 | #endif |
059ec3d9 PH |
2859 | |
2860 | for (; cb != NULL; cb = cb->next) | |
2861 | { | |
55414b25 | 2862 | const uschar *arg; |
8e669ac1 | 2863 | int control_type; |
059ec3d9 PH |
2864 | |
2865 | /* The message and log_message items set up messages to be used in | |
2866 | case of rejection. They are expanded later. */ | |
2867 | ||
2868 | if (cb->type == ACLC_MESSAGE) | |
2869 | { | |
e1d04f48 | 2870 | HDEBUG(D_acl) debug_printf_indent(" message: %s\n", cb->arg); |
059ec3d9 PH |
2871 | user_message = cb->arg; |
2872 | continue; | |
2873 | } | |
2874 | ||
2875 | if (cb->type == ACLC_LOG_MESSAGE) | |
2876 | { | |
e1d04f48 | 2877 | HDEBUG(D_acl) debug_printf_indent("l_message: %s\n", cb->arg); |
059ec3d9 PH |
2878 | log_message = cb->arg; |
2879 | continue; | |
2880 | } | |
2881 | ||
2882 | /* The endpass "condition" just sets a flag to show it occurred. This is | |
2883 | checked at compile time to be on an "accept" or "discard" item. */ | |
2884 | ||
2885 | if (cb->type == ACLC_ENDPASS) | |
2886 | { | |
2887 | *epp = TRUE; | |
2888 | continue; | |
2889 | } | |
2890 | ||
2891 | /* For other conditions and modifiers, the argument is expanded now for some | |
2892 | of them, but not for all, because expansion happens down in some lower level | |
2893 | checking functions in some cases. */ | |
2894 | ||
560e71cc JH |
2895 | if (!conditions[cb->type].expand_at_top) |
2896 | arg = cb->arg; | |
2897 | else if (!(arg = expand_string(cb->arg))) | |
059ec3d9 | 2898 | { |
560e71cc JH |
2899 | if (expand_string_forcedfail) continue; |
2900 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
2901 | cb->arg, expand_string_message); | |
2902 | return search_find_defer ? DEFER : ERROR; | |
059ec3d9 | 2903 | } |
059ec3d9 PH |
2904 | |
2905 | /* Show condition, and expanded condition if it's different */ | |
2906 | ||
2907 | HDEBUG(D_acl) | |
2908 | { | |
2909 | int lhswidth = 0; | |
e1d04f48 | 2910 | debug_printf_indent("check %s%s %n", |
2d009132 JH |
2911 | (!conditions[cb->type].is_modifier && cb->u.negated)? "!":"", |
2912 | conditions[cb->type].name, &lhswidth); | |
059ec3d9 PH |
2913 | |
2914 | if (cb->type == ACLC_SET) | |
2915 | { | |
a79d8834 JH |
2916 | #ifndef DISABLE_DKIM |
2917 | if ( Ustrcmp(cb->u.varname, "dkim_verify_status") == 0 | |
2918 | || Ustrcmp(cb->u.varname, "dkim_verify_reason") == 0) | |
2919 | { | |
2920 | debug_printf("%s ", cb->u.varname); | |
2921 | lhswidth += 19; | |
2922 | } | |
2923 | else | |
2924 | #endif | |
2925 | { | |
2926 | debug_printf("acl_%s ", cb->u.varname); | |
2927 | lhswidth += 5 + Ustrlen(cb->u.varname); | |
2928 | } | |
059ec3d9 PH |
2929 | } |
2930 | ||
2931 | debug_printf("= %s\n", cb->arg); | |
2932 | ||
2933 | if (arg != cb->arg) | |
2934 | debug_printf("%.*s= %s\n", lhswidth, | |
2935 | US" ", CS arg); | |
2936 | } | |
2937 | ||
2938 | /* Check that this condition makes sense at this time */ | |
2939 | ||
2d009132 | 2940 | if ((conditions[cb->type].forbids & (1 << where)) != 0) |
059ec3d9 PH |
2941 | { |
2942 | *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL", | |
2d009132 JH |
2943 | conditions[cb->type].is_modifier ? "use" : "test", |
2944 | conditions[cb->type].name, acl_wherenames[where]); | |
059ec3d9 PH |
2945 | return ERROR; |
2946 | } | |
2947 | ||
2948 | /* Run the appropriate test for each condition, or take the appropriate | |
2949 | action for the remaining modifiers. */ | |
2950 | ||
2951 | switch(cb->type) | |
2952 | { | |
71fafd95 PH |
2953 | case ACLC_ADD_HEADER: |
2954 | setup_header(arg); | |
2955 | break; | |
2956 | ||
059ec3d9 PH |
2957 | /* A nested ACL that returns "discard" makes sense only for an "accept" or |
2958 | "discard" verb. */ | |
71fafd95 | 2959 | |
059ec3d9 | 2960 | case ACLC_ACL: |
e1d04f48 | 2961 | rc = acl_check_wargs(where, addr, arg, user_msgptr, log_msgptr); |
7421ecab JH |
2962 | if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD) |
2963 | { | |
2964 | *log_msgptr = string_sprintf("nested ACL returned \"discard\" for " | |
2965 | "\"%s\" command (only allowed with \"accept\" or \"discard\")", | |
2966 | verbs[verb]); | |
2967 | return ERROR; | |
2968 | } | |
059ec3d9 PH |
2969 | break; |
2970 | ||
2971 | case ACLC_AUTHENTICATED: | |
2972 | rc = (sender_host_authenticated == NULL)? FAIL : | |
2973 | match_isinlist(sender_host_authenticated, &arg, 0, NULL, NULL, MCL_STRING, | |
2974 | TRUE, NULL); | |
2975 | break; | |
2976 | ||
71fafd95 | 2977 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
8523533c TK |
2978 | case ACLC_BMI_OPTIN: |
2979 | { | |
2980 | int old_pool = store_pool; | |
2981 | store_pool = POOL_PERM; | |
2982 | bmi_current_optin = string_copy(arg); | |
2983 | store_pool = old_pool; | |
2984 | } | |
2985 | break; | |
71fafd95 | 2986 | #endif |
8523533c | 2987 | |
059ec3d9 | 2988 | case ACLC_CONDITION: |
f3766eb5 NM |
2989 | /* The true/false parsing here should be kept in sync with that used in |
2990 | expand.c when dealing with ECOND_BOOL so that we don't have too many | |
2991 | different definitions of what can be a boolean. */ | |
51c7471d JH |
2992 | if (*arg == '-' |
2993 | ? Ustrspn(arg+1, "0123456789") == Ustrlen(arg+1) /* Negative number */ | |
2994 | : Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */ | |
059ec3d9 PH |
2995 | rc = (Uatoi(arg) == 0)? FAIL : OK; |
2996 | else | |
2997 | rc = (strcmpic(arg, US"no") == 0 || | |
2998 | strcmpic(arg, US"false") == 0)? FAIL : | |
2999 | (strcmpic(arg, US"yes") == 0 || | |
3000 | strcmpic(arg, US"true") == 0)? OK : DEFER; | |
3001 | if (rc == DEFER) | |
3002 | *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg); | |
3003 | break; | |
3004 | ||
c3611384 PH |
3005 | case ACLC_CONTINUE: /* Always succeeds */ |
3006 | break; | |
3007 | ||
059ec3d9 | 3008 | case ACLC_CONTROL: |
c5fcb476 | 3009 | { |
55414b25 JH |
3010 | const uschar *p = NULL; |
3011 | control_type = decode_control(arg, &p, where, log_msgptr); | |
4840604e | 3012 | |
55414b25 | 3013 | /* Check if this control makes sense at this time */ |
f7572e5a | 3014 | |
d7bed771 | 3015 | if (controls_list[control_type].forbids & (1 << where)) |
55414b25 JH |
3016 | { |
3017 | *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL", | |
d7bed771 | 3018 | controls_list[control_type].name, acl_wherenames[where]); |
55414b25 JH |
3019 | return ERROR; |
3020 | } | |
8800895a | 3021 | |
55414b25 JH |
3022 | switch(control_type) |
3023 | { | |
3024 | case CONTROL_AUTH_UNADVERTISED: | |
3025 | allow_auth_unadvertised = TRUE; | |
3026 | break; | |
3027 | ||
3028 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
3029 | case CONTROL_BMI_RUN: | |
3030 | bmi_run = 1; | |
3031 | break; | |
3032 | #endif | |
3033 | ||
3034 | #ifndef DISABLE_DKIM | |
3035 | case CONTROL_DKIM_VERIFY: | |
3036 | dkim_disable_verify = TRUE; | |
3037 | #ifdef EXPERIMENTAL_DMARC | |
3038 | /* Since DKIM was blocked, skip DMARC too */ | |
3039 | dmarc_disable_verify = TRUE; | |
3040 | dmarc_enable_forensic = FALSE; | |
3041 | #endif | |
3042 | break; | |
3043 | #endif | |
3044 | ||
3045 | #ifdef EXPERIMENTAL_DMARC | |
3046 | case CONTROL_DMARC_VERIFY: | |
3047 | dmarc_disable_verify = TRUE; | |
3048 | break; | |
3049 | ||
3050 | case CONTROL_DMARC_FORENSIC: | |
3051 | dmarc_enable_forensic = TRUE; | |
3052 | break; | |
3053 | #endif | |
3054 | ||
3055 | case CONTROL_DSCP: | |
3056 | if (*p == '/') | |
3057 | { | |
3058 | int fd, af, level, optname, value; | |
3059 | /* If we are acting on stdin, the setsockopt may fail if stdin is not | |
3060 | a socket; we can accept that, we'll just debug-log failures anyway. */ | |
3061 | fd = fileno(smtp_in); | |
3062 | af = ip_get_address_family(fd); | |
3063 | if (af < 0) | |
3064 | { | |
3065 | HDEBUG(D_acl) | |
e1d04f48 | 3066 | debug_printf_indent("smtp input is probably not a socket [%s], not setting DSCP\n", |
55414b25 JH |
3067 | strerror(errno)); |
3068 | break; | |
3069 | } | |
3070 | if (dscp_lookup(p+1, af, &level, &optname, &value)) | |
3071 | { | |
3072 | if (setsockopt(fd, level, optname, &value, sizeof(value)) < 0) | |
3073 | { | |
e1d04f48 | 3074 | HDEBUG(D_acl) debug_printf_indent("failed to set input DSCP[%s]: %s\n", |
55414b25 JH |
3075 | p+1, strerror(errno)); |
3076 | } | |
3077 | else | |
3078 | { | |
e1d04f48 | 3079 | HDEBUG(D_acl) debug_printf_indent("set input DSCP to \"%s\"\n", p+1); |
55414b25 JH |
3080 | } |
3081 | } | |
3082 | else | |
3083 | { | |
3084 | *log_msgptr = string_sprintf("unrecognised DSCP value in \"control=%s\"", arg); | |
3085 | return ERROR; | |
3086 | } | |
3087 | } | |
3088 | else | |
3089 | { | |
3090 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3091 | return ERROR; | |
3092 | } | |
3093 | break; | |
3094 | ||
3095 | case CONTROL_ERROR: | |
3096 | return ERROR; | |
3097 | ||
3098 | case CONTROL_CASEFUL_LOCAL_PART: | |
3099 | deliver_localpart = addr->cc_local_part; | |
3100 | break; | |
3101 | ||
3102 | case CONTROL_CASELOWER_LOCAL_PART: | |
3103 | deliver_localpart = addr->lc_local_part; | |
3104 | break; | |
3105 | ||
3106 | case CONTROL_ENFORCE_SYNC: | |
3107 | smtp_enforce_sync = TRUE; | |
3108 | break; | |
3109 | ||
3110 | case CONTROL_NO_ENFORCE_SYNC: | |
3111 | smtp_enforce_sync = FALSE; | |
3112 | break; | |
3113 | ||
3114 | #ifdef WITH_CONTENT_SCAN | |
3115 | case CONTROL_NO_MBOX_UNSPOOL: | |
3116 | no_mbox_unspool = TRUE; | |
3117 | break; | |
3118 | #endif | |
3119 | ||
3120 | case CONTROL_NO_MULTILINE: | |
3121 | no_multiline_responses = TRUE; | |
3122 | break; | |
3123 | ||
3124 | case CONTROL_NO_PIPELINING: | |
3125 | pipelining_enable = FALSE; | |
3126 | break; | |
3127 | ||
3128 | case CONTROL_NO_DELAY_FLUSH: | |
3129 | disable_delay_flush = TRUE; | |
3130 | break; | |
3131 | ||
3132 | case CONTROL_NO_CALLOUT_FLUSH: | |
3133 | disable_callout_flush = TRUE; | |
3134 | break; | |
3135 | ||
3136 | case CONTROL_FAKEREJECT: | |
57cc2785 | 3137 | cancel_cutthrough_connection(TRUE, US"fakereject"); |
55414b25 JH |
3138 | case CONTROL_FAKEDEFER: |
3139 | fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL; | |
3140 | if (*p == '/') | |
3141 | { | |
3142 | const uschar *pp = p + 1; | |
3143 | while (*pp != 0) pp++; | |
3144 | fake_response_text = expand_string(string_copyn(p+1, pp-p-1)); | |
3145 | p = pp; | |
3146 | } | |
3147 | else | |
3148 | { | |
3149 | /* Explicitly reset to default string */ | |
3150 | 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)."; | |
3151 | } | |
3152 | break; | |
ed7f7860 | 3153 | |
55414b25 JH |
3154 | case CONTROL_FREEZE: |
3155 | deliver_freeze = TRUE; | |
3156 | deliver_frozen_at = time(NULL); | |
3157 | freeze_tell = freeze_tell_config; /* Reset to configured value */ | |
3158 | if (Ustrncmp(p, "/no_tell", 8) == 0) | |
3159 | { | |
3160 | p += 8; | |
3161 | freeze_tell = NULL; | |
3162 | } | |
3163 | if (*p != 0) | |
3164 | { | |
3165 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3166 | return ERROR; | |
3167 | } | |
57cc2785 | 3168 | cancel_cutthrough_connection(TRUE, US"item frozen"); |
55414b25 JH |
3169 | break; |
3170 | ||
3171 | case CONTROL_QUEUE_ONLY: | |
3172 | queue_only_policy = TRUE; | |
57cc2785 | 3173 | cancel_cutthrough_connection(TRUE, US"queueing forced"); |
55414b25 JH |
3174 | break; |
3175 | ||
3176 | case CONTROL_SUBMISSION: | |
3177 | originator_name = US""; | |
3178 | submission_mode = TRUE; | |
3179 | while (*p == '/') | |
3180 | { | |
3181 | if (Ustrncmp(p, "/sender_retain", 14) == 0) | |
3182 | { | |
3183 | p += 14; | |
3184 | active_local_sender_retain = TRUE; | |
3185 | active_local_from_check = FALSE; | |
3186 | } | |
3187 | else if (Ustrncmp(p, "/domain=", 8) == 0) | |
3188 | { | |
3189 | const uschar *pp = p + 8; | |
3190 | while (*pp != 0 && *pp != '/') pp++; | |
3191 | submission_domain = string_copyn(p+8, pp-p-8); | |
3192 | p = pp; | |
3193 | } | |
3194 | /* The name= option must be last, because it swallows the rest of | |
3195 | the string. */ | |
3196 | else if (Ustrncmp(p, "/name=", 6) == 0) | |
3197 | { | |
3198 | const uschar *pp = p + 6; | |
3199 | while (*pp != 0) pp++; | |
3200 | submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6, | |
3201 | big_buffer, big_buffer_size)); | |
3202 | p = pp; | |
3203 | } | |
3204 | else break; | |
3205 | } | |
3206 | if (*p != 0) | |
3207 | { | |
3208 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3209 | return ERROR; | |
3210 | } | |
3211 | break; | |
e4bdf652 | 3212 | |
55414b25 | 3213 | case CONTROL_DEBUG: |
55414b25 | 3214 | { |
b0d68adc JH |
3215 | uschar * debug_tag = NULL; |
3216 | uschar * debug_opts = NULL; | |
3217 | BOOL kill = FALSE; | |
3218 | ||
3219 | while (*p == '/') | |
55414b25 | 3220 | { |
b0d68adc JH |
3221 | const uschar * pp = p+1; |
3222 | if (Ustrncmp(pp, "tag=", 4) == 0) | |
3223 | { | |
3224 | for (pp += 4; *pp && *pp != '/';) pp++; | |
3225 | debug_tag = string_copyn(p+5, pp-p-5); | |
3226 | } | |
3227 | else if (Ustrncmp(pp, "opts=", 5) == 0) | |
3228 | { | |
3229 | for (pp += 5; *pp && *pp != '/';) pp++; | |
3230 | debug_opts = string_copyn(p+6, pp-p-6); | |
3231 | } | |
3232 | else if (Ustrncmp(pp, "kill", 4) == 0) | |
3233 | { | |
3234 | for (pp += 4; *pp && *pp != '/';) pp++; | |
3235 | kill = TRUE; | |
3236 | } | |
3237 | else | |
3238 | while (*pp && *pp != '/') pp++; | |
55414b25 JH |
3239 | p = pp; |
3240 | } | |
b0d68adc JH |
3241 | |
3242 | if (kill) | |
3243 | debug_logging_stop(); | |
3244 | else | |
3245 | debug_logging_activate(debug_tag, debug_opts); | |
55414b25 | 3246 | } |
55414b25 JH |
3247 | break; |
3248 | ||
3249 | case CONTROL_SUPPRESS_LOCAL_FIXUPS: | |
3250 | suppress_local_fixups = TRUE; | |
3251 | break; | |
3252 | ||
3253 | case CONTROL_CUTTHROUGH_DELIVERY: | |
a2b89db1 | 3254 | #ifndef DISABLE_PRDR |
55414b25 | 3255 | if (prdr_requested) |
a2b89db1 PP |
3256 | #else |
3257 | if (0) | |
3258 | #endif | |
55414b25 JH |
3259 | /* Too hard to think about for now. We might in future cutthrough |
3260 | the case where both sides handle prdr and this-node prdr acl | |
3261 | is "accept" */ | |
93a6fce2 | 3262 | *log_msgptr = string_sprintf("PRDR on %s reception\n", arg); |
5032d1cf JH |
3263 | else |
3264 | { | |
55414b25 JH |
3265 | if (deliver_freeze) |
3266 | *log_msgptr = US"frozen"; | |
3267 | else if (queue_only_policy) | |
3268 | *log_msgptr = US"queue-only"; | |
3269 | else if (fake_response == FAIL) | |
3270 | *log_msgptr = US"fakereject"; | |
3271 | else | |
3272 | { | |
ff5929e3 JH |
3273 | if (rcpt_count == 1) |
3274 | { | |
3275 | cutthrough.delivery = TRUE; | |
3276 | while (*p == '/') | |
3277 | { | |
3278 | const uschar * pp = p+1; | |
3279 | if (Ustrncmp(pp, "defer=", 6) == 0) | |
3280 | { | |
3281 | pp += 6; | |
3282 | if (Ustrncmp(pp, "pass", 4) == 0) cutthrough.defer_pass = TRUE; | |
3283 | /* else if (Ustrncmp(pp, "spool") == 0) ; default */ | |
3284 | } | |
3285 | else | |
3286 | while (*pp && *pp != '/') pp++; | |
3287 | p = pp; | |
3288 | } | |
3289 | } | |
06fdb9f7 JH |
3290 | else |
3291 | DEBUG(D_acl) debug_printf(" cutthrough request ignored for nonfirst rcpt\n"); | |
55414b25 JH |
3292 | break; |
3293 | } | |
3294 | *log_msgptr = string_sprintf("\"control=%s\" on %s item", | |
3295 | arg, *log_msgptr); | |
5032d1cf | 3296 | } |
55414b25 | 3297 | return ERROR; |
3c8b3577 | 3298 | |
8c5d388a | 3299 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
3300 | case CONTROL_UTF8_DOWNCONVERT: |
3301 | if (*p == '/') | |
3302 | { | |
921dfc11 JH |
3303 | if (p[1] == '1') |
3304 | { | |
3305 | message_utf8_downconvert = 1; | |
3306 | addr->prop.utf8_downcvt = TRUE; | |
3307 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3308 | p += 2; | |
3309 | break; | |
3310 | } | |
3311 | if (p[1] == '0') | |
3312 | { | |
3313 | message_utf8_downconvert = 0; | |
3314 | addr->prop.utf8_downcvt = FALSE; | |
3315 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3316 | p += 2; | |
3317 | break; | |
3318 | } | |
3c8b3577 | 3319 | if (p[1] == '-' && p[2] == '1') |
921dfc11 JH |
3320 | { |
3321 | message_utf8_downconvert = -1; | |
3322 | addr->prop.utf8_downcvt = FALSE; | |
3323 | addr->prop.utf8_downcvt_maybe = TRUE; | |
3324 | p += 3; | |
3325 | break; | |
3326 | } | |
3c8b3577 JH |
3327 | *log_msgptr = US"bad option value for control=utf8_downconvert"; |
3328 | } | |
3329 | else | |
3330 | { | |
921dfc11 JH |
3331 | message_utf8_downconvert = 1; |
3332 | addr->prop.utf8_downcvt = TRUE; | |
3333 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3334 | break; | |
3c8b3577 JH |
3335 | } |
3336 | return ERROR; | |
8c5d388a | 3337 | #endif |
3c8b3577 | 3338 | |
9171d434 | 3339 | } |
55414b25 | 3340 | break; |
059ec3d9 | 3341 | } |
059ec3d9 | 3342 | |
6a8f9482 TK |
3343 | #ifdef EXPERIMENTAL_DCC |
3344 | case ACLC_DCC: | |
3345 | { | |
4c04137d | 3346 | /* Separate the regular expression and any optional parameters. */ |
55414b25 JH |
3347 | const uschar * list = arg; |
3348 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
6a8f9482 TK |
3349 | /* Run the dcc backend. */ |
3350 | rc = dcc_process(&ss); | |
4c04137d | 3351 | /* Modify return code based upon the existence of options. */ |
3c8b3577 | 3352 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) |
6a8f9482 | 3353 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) |
3c8b3577 | 3354 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ |
6a8f9482 TK |
3355 | } |
3356 | break; | |
3357 | #endif | |
3358 | ||
71fafd95 | 3359 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3360 | case ACLC_DECODE: |
3361 | rc = mime_decode(&arg); | |
3362 | break; | |
71fafd95 | 3363 | #endif |
8523533c | 3364 | |
059ec3d9 PH |
3365 | case ACLC_DELAY: |
3366 | { | |
3367 | int delay = readconf_readtime(arg, 0, FALSE); | |
3368 | if (delay < 0) | |
3369 | { | |
3370 | *log_msgptr = string_sprintf("syntax error in argument for \"delay\" " | |
3371 | "modifier: \"%s\" is not a time value", arg); | |
3372 | return ERROR; | |
3373 | } | |
3374 | else | |
3375 | { | |
e1d04f48 | 3376 | HDEBUG(D_acl) debug_printf_indent("delay modifier requests %d-second delay\n", |
059ec3d9 PH |
3377 | delay); |
3378 | if (host_checking) | |
3379 | { | |
3380 | HDEBUG(D_acl) | |
e1d04f48 | 3381 | debug_printf_indent("delay skipped in -bh checking mode\n"); |
059ec3d9 | 3382 | } |
010c2d14 | 3383 | |
ae9d18bc JH |
3384 | /* NOTE 1: Remember that we may be |
3385 | dealing with stdin/stdout here, in addition to TCP/IP connections. | |
3386 | Also, delays may be specified for non-SMTP input, where smtp_out and | |
3387 | smtp_in will be NULL. Whatever is done must work in all cases. | |
3388 | ||
3389 | NOTE 2: The added feature of flushing the output before a delay must | |
3390 | apply only to SMTP input. Hence the test for smtp_out being non-NULL. | |
3391 | */ | |
3392 | ||
3393 | else | |
3394 | { | |
3395 | if (smtp_out != NULL && !disable_delay_flush) | |
3396 | mac_smtp_fflush(); | |
3397 | ||
861a7c51 | 3398 | #if !defined(NO_POLL_H) && defined (POLLRDHUP) |
ae9d18bc JH |
3399 | { |
3400 | struct pollfd p; | |
3401 | nfds_t n = 0; | |
3402 | if (smtp_out) | |
3403 | { | |
3404 | p.fd = fileno(smtp_out); | |
3405 | p.events = POLLRDHUP; | |
3406 | n = 1; | |
3407 | } | |
3408 | if (poll(&p, n, delay*1000) > 0) | |
e1d04f48 | 3409 | HDEBUG(D_acl) debug_printf_indent("delay cancelled by peer close\n"); |
ae9d18bc JH |
3410 | } |
3411 | #else | |
010c2d14 PH |
3412 | /* It appears to be impossible to detect that a TCP/IP connection has |
3413 | gone away without reading from it. This means that we cannot shorten | |
3414 | the delay below if the client goes away, because we cannot discover | |
3415 | that the client has closed its end of the connection. (The connection | |
3416 | is actually in a half-closed state, waiting for the server to close its | |
3417 | end.) It would be nice to be able to detect this state, so that the | |
3418 | Exim process is not held up unnecessarily. However, it seems that we | |
3419 | can't. The poll() function does not do the right thing, and in any case | |
3420 | it is not always available. | |
047bdd8c | 3421 | */ |
010c2d14 | 3422 | |
86b8287f | 3423 | while (delay > 0) delay = sleep(delay); |
ae9d18bc | 3424 | #endif |
8e669ac1 | 3425 | } |
059ec3d9 PH |
3426 | } |
3427 | } | |
3428 | break; | |
3429 | ||
80a47a2c TK |
3430 | #ifndef DISABLE_DKIM |
3431 | case ACLC_DKIM_SIGNER: | |
a79d8834 | 3432 | if (dkim_cur_signer) |
9e5d6b55 | 3433 | rc = match_isinlist(dkim_cur_signer, |
80a47a2c | 3434 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); |
80a47a2c | 3435 | else |
b0b9dbb1 | 3436 | rc = FAIL; |
71fafd95 PH |
3437 | break; |
3438 | ||
80a47a2c | 3439 | case ACLC_DKIM_STATUS: |
a79d8834 | 3440 | rc = match_isinlist(dkim_verify_status, |
80a47a2c | 3441 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); |
71fafd95 PH |
3442 | break; |
3443 | #endif | |
fb2274d4 | 3444 | |
4840604e TL |
3445 | #ifdef EXPERIMENTAL_DMARC |
3446 | case ACLC_DMARC_STATUS: | |
4a8ce2d8 | 3447 | if (!dmarc_has_been_checked) |
4840604e | 3448 | dmarc_process(); |
4a8ce2d8 | 3449 | dmarc_has_been_checked = TRUE; |
4840604e TL |
3450 | /* used long way of dmarc_exim_expand_query() in case we need more |
3451 | * view into the process in the future. */ | |
3452 | rc = match_isinlist(dmarc_exim_expand_query(DMARC_VERIFY_STATUS), | |
3453 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); | |
3454 | break; | |
3455 | #endif | |
3456 | ||
059ec3d9 | 3457 | case ACLC_DNSLISTS: |
379ba7d0 | 3458 | rc = verify_check_dnsbl(where, &arg, log_msgptr); |
059ec3d9 PH |
3459 | break; |
3460 | ||
3461 | case ACLC_DOMAINS: | |
3462 | rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor, | |
55414b25 | 3463 | addr->domain_cache, MCL_DOMAIN, TRUE, CUSS &deliver_domain_data); |
059ec3d9 PH |
3464 | break; |
3465 | ||
3466 | /* The value in tls_cipher is the full cipher name, for example, | |
3467 | TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the | |
3468 | cipher names such as DES-CBC3-SHA. But program defensively. We don't know | |
3469 | what may in practice come out of the SSL library - which at the time of | |
3470 | writing is poorly documented. */ | |
3471 | ||
3472 | case ACLC_ENCRYPTED: | |
817d9f57 | 3473 | if (tls_in.cipher == NULL) rc = FAIL; else |
059ec3d9 PH |
3474 | { |
3475 | uschar *endcipher = NULL; | |
817d9f57 JH |
3476 | uschar *cipher = Ustrchr(tls_in.cipher, ':'); |
3477 | if (cipher == NULL) cipher = tls_in.cipher; else | |
059ec3d9 PH |
3478 | { |
3479 | endcipher = Ustrchr(++cipher, ':'); | |
3480 | if (endcipher != NULL) *endcipher = 0; | |
3481 | } | |
3482 | rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL); | |
3483 | if (endcipher != NULL) *endcipher = ':'; | |
3484 | } | |
3485 | break; | |
3486 | ||
3487 | /* Use verify_check_this_host() instead of verify_check_host() so that | |
3488 | we can pass over &host_data to catch any looked up data. Once it has been | |
3489 | set, it retains its value so that it's still there if another ACL verb | |
3490 | comes through here and uses the cache. However, we must put it into | |
3491 | permanent store in case it is also expected to be used in a subsequent | |
3492 | message in the same SMTP connection. */ | |
3493 | ||
3494 | case ACLC_HOSTS: | |
3495 | rc = verify_check_this_host(&arg, sender_host_cache, NULL, | |
55414b25 JH |
3496 | (sender_host_address == NULL)? US"" : sender_host_address, |
3497 | CUSS &host_data); | |
4a452c43 JH |
3498 | if (rc == DEFER) *log_msgptr = search_error_message; |
3499 | if (host_data) host_data = string_copy_malloc(host_data); | |
059ec3d9 PH |
3500 | break; |
3501 | ||
3502 | case ACLC_LOCAL_PARTS: | |
3503 | rc = match_isinlist(addr->cc_local_part, &arg, 0, | |
3504 | &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE, | |
55414b25 | 3505 | CUSS &deliver_localpart_data); |
059ec3d9 PH |
3506 | break; |
3507 | ||
6ea85e9a PH |
3508 | case ACLC_LOG_REJECT_TARGET: |
3509 | { | |
3510 | int logbits = 0; | |
3511 | int sep = 0; | |
55414b25 | 3512 | const uschar *s = arg; |
6ea85e9a | 3513 | uschar *ss; |
4a452c43 | 3514 | while ((ss = string_nextinlist(&s, &sep, big_buffer, big_buffer_size))) |
6ea85e9a PH |
3515 | { |
3516 | if (Ustrcmp(ss, "main") == 0) logbits |= LOG_MAIN; | |
3517 | else if (Ustrcmp(ss, "panic") == 0) logbits |= LOG_PANIC; | |
3518 | else if (Ustrcmp(ss, "reject") == 0) logbits |= LOG_REJECT; | |
3519 | else | |
3520 | { | |
3521 | logbits |= LOG_MAIN|LOG_REJECT; | |
3522 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown log name \"%s\" in " | |
3523 | "\"log_reject_target\" in %s ACL", ss, acl_wherenames[where]); | |
3524 | } | |
3525 | } | |
3526 | log_reject_target = logbits; | |
3527 | } | |
3528 | break; | |
3529 | ||
059ec3d9 PH |
3530 | case ACLC_LOGWRITE: |
3531 | { | |
3532 | int logbits = 0; | |
55414b25 | 3533 | const uschar *s = arg; |
059ec3d9 PH |
3534 | if (*s == ':') |
3535 | { | |
3536 | s++; | |
3537 | while (*s != ':') | |
3538 | { | |
3539 | if (Ustrncmp(s, "main", 4) == 0) | |
3540 | { logbits |= LOG_MAIN; s += 4; } | |
3541 | else if (Ustrncmp(s, "panic", 5) == 0) | |
3542 | { logbits |= LOG_PANIC; s += 5; } | |
3543 | else if (Ustrncmp(s, "reject", 6) == 0) | |
3544 | { logbits |= LOG_REJECT; s += 6; } | |
3545 | else | |
3546 | { | |
3547 | logbits = LOG_MAIN|LOG_PANIC; | |
3548 | s = string_sprintf(":unknown log name in \"%s\" in " | |
3549 | "\"logwrite\" in %s ACL", arg, acl_wherenames[where]); | |
3550 | } | |
3551 | if (*s == ',') s++; | |
3552 | } | |
3553 | s++; | |
3554 | } | |
3555 | while (isspace(*s)) s++; | |
6ea85e9a PH |
3556 | |
3557 | ||
059ec3d9 PH |
3558 | if (logbits == 0) logbits = LOG_MAIN; |
3559 | log_write(0, logbits, "%s", string_printing(s)); | |
3560 | } | |
3561 | break; | |
8e669ac1 | 3562 | |
71fafd95 | 3563 | #ifdef WITH_CONTENT_SCAN |
0f0c8159 | 3564 | case ACLC_MALWARE: /* Run the malware backend. */ |
8523533c | 3565 | { |
6ea85e9a | 3566 | /* Separate the regular expression and any optional parameters. */ |
55414b25 JH |
3567 | const uschar * list = arg; |
3568 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
0f0c8159 JH |
3569 | uschar *opt; |
3570 | BOOL defer_ok = FALSE; | |
3571 | int timeout = 0; | |
3572 | ||
55414b25 | 3573 | while ((opt = string_nextinlist(&list, &sep, NULL, 0))) |
0f0c8159 JH |
3574 | if (strcmpic(opt, US"defer_ok") == 0) |
3575 | defer_ok = TRUE; | |
3576 | else if ( strncmpic(opt, US"tmo=", 4) == 0 | |
3577 | && (timeout = readconf_readtime(opt+4, '\0', FALSE)) < 0 | |
3578 | ) | |
3579 | { | |
3580 | *log_msgptr = string_sprintf("bad timeout value in '%s'", opt); | |
3581 | return ERROR; | |
3582 | } | |
3583 | ||
3584 | rc = malware(ss, timeout); | |
3585 | if (rc == DEFER && defer_ok) | |
3586 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ | |
8523533c TK |
3587 | } |
3588 | break; | |
3589 | ||
3590 | case ACLC_MIME_REGEX: | |
71fafd95 | 3591 | rc = mime_regex(&arg); |
8523533c | 3592 | break; |
71fafd95 | 3593 | #endif |
059ec3d9 | 3594 | |
b0b9dbb1 | 3595 | case ACLC_QUEUE: |
944e8b37 JH |
3596 | if (Ustrchr(arg, '/')) |
3597 | { | |
3598 | *log_msgptr = string_sprintf( | |
3599 | "Directory separator not permitted in queue name: '%s'", arg); | |
3600 | return ERROR; | |
3601 | } | |
b0b9dbb1 JH |
3602 | queue_name = string_copy_malloc(arg); |
3603 | break; | |
3604 | ||
870f6ba8 | 3605 | case ACLC_RATELIMIT: |
90fc3069 | 3606 | rc = acl_ratelimit(arg, where, log_msgptr); |
870f6ba8 TF |
3607 | break; |
3608 | ||
059ec3d9 | 3609 | case ACLC_RECIPIENTS: |
36d295f1 | 3610 | rc = match_address_list(CUS addr->address, TRUE, TRUE, &arg, NULL, -1, 0, |
55414b25 | 3611 | CUSS &recipient_data); |
059ec3d9 PH |
3612 | break; |
3613 | ||
71fafd95 PH |
3614 | #ifdef WITH_CONTENT_SCAN |
3615 | case ACLC_REGEX: | |
3616 | rc = regex(&arg); | |
8523533c | 3617 | break; |
71fafd95 | 3618 | #endif |
8523533c | 3619 | |
e7568d51 TL |
3620 | case ACLC_REMOVE_HEADER: |
3621 | setup_remove_header(arg); | |
3622 | break; | |
3623 | ||
059ec3d9 PH |
3624 | case ACLC_SENDER_DOMAINS: |
3625 | { | |
3626 | uschar *sdomain; | |
3627 | sdomain = Ustrrchr(sender_address, '@'); | |
f7ae7462 | 3628 | sdomain = sdomain ? sdomain + 1 : US""; |
059ec3d9 PH |
3629 | rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor, |
3630 | sender_domain_cache, MCL_DOMAIN, TRUE, NULL); | |
3631 | } | |
3632 | break; | |
3633 | ||
3634 | case ACLC_SENDERS: | |
36d295f1 | 3635 | rc = match_address_list(CUS sender_address, TRUE, TRUE, &arg, |
55414b25 | 3636 | sender_address_cache, -1, 0, CUSS &sender_data); |
059ec3d9 PH |
3637 | break; |
3638 | ||
3639 | /* Connection variables must persist forever */ | |
3640 | ||
3641 | case ACLC_SET: | |
3642 | { | |
3643 | int old_pool = store_pool; | |
5ef5dd52 | 3644 | if ( cb->u.varname[0] == 'c' |
a79d8834 JH |
3645 | #ifndef DISABLE_DKIM |
3646 | || cb->u.varname[0] == 'd' | |
3647 | #endif | |
0cbf2b82 | 3648 | #ifndef DISABLE_EVENT |
5ef5dd52 JB |
3649 | || event_name /* An event is being delivered */ |
3650 | #endif | |
3651 | ) | |
3652 | store_pool = POOL_PERM; | |
a79d8834 JH |
3653 | #ifndef DISABLE_DKIM /* Overwriteable dkim result variables */ |
3654 | if (Ustrcmp(cb->u.varname, "dkim_verify_status") == 0) | |
3655 | dkim_verify_status = string_copy(arg); | |
3656 | else if (Ustrcmp(cb->u.varname, "dkim_verify_reason") == 0) | |
3657 | dkim_verify_reason = string_copy(arg); | |
3658 | else | |
3659 | #endif | |
3660 | acl_var_create(cb->u.varname)->data.ptr = string_copy(arg); | |
059ec3d9 PH |
3661 | store_pool = old_pool; |
3662 | } | |
3663 | break; | |
3664 | ||
eb52e2cb | 3665 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3666 | case ACLC_SPAM: |
3667 | { | |
4c04137d | 3668 | /* Separate the regular expression and any optional parameters. */ |
55414b25 JH |
3669 | const uschar * list = arg; |
3670 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
eb52e2cb | 3671 | |
55414b25 | 3672 | rc = spam(CUSS &ss); |
4c04137d | 3673 | /* Modify return code based upon the existence of options. */ |
eb52e2cb | 3674 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) |
8523533c | 3675 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) |
eb52e2cb | 3676 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ |
8523533c TK |
3677 | } |
3678 | break; | |
eb52e2cb | 3679 | #endif |
8523533c | 3680 | |
7952eef9 | 3681 | #ifdef SUPPORT_SPF |
8523533c | 3682 | case ACLC_SPF: |
65a7d8c3 NM |
3683 | rc = spf_process(&arg, sender_address, SPF_PROCESS_NORMAL); |
3684 | break; | |
3685 | case ACLC_SPF_GUESS: | |
3686 | rc = spf_process(&arg, sender_address, SPF_PROCESS_GUESS); | |
8523533c | 3687 | break; |
eb52e2cb | 3688 | #endif |
8523533c | 3689 | |
b0019c78 TF |
3690 | case ACLC_UDPSEND: |
3691 | rc = acl_udpsend(arg, log_msgptr); | |
3692 | break; | |
3693 | ||
059ec3d9 PH |
3694 | /* If the verb is WARN, discard any user message from verification, because |
3695 | such messages are SMTP responses, not header additions. The latter come | |
475fe28a PH |
3696 | only from explicit "message" modifiers. However, put the user message into |
3697 | $acl_verify_message so it can be used in subsequent conditions or modifiers | |
3698 | (until something changes it). */ | |
059ec3d9 PH |
3699 | |
3700 | case ACLC_VERIFY: | |
3701 | rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno); | |
3703d818 JH |
3702 | if (*user_msgptr) |
3703 | acl_verify_message = *user_msgptr; | |
059ec3d9 PH |
3704 | if (verb == ACL_WARN) *user_msgptr = NULL; |
3705 | break; | |
3706 | ||
3707 | default: | |
3708 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown " | |
3709 | "condition %d", cb->type); | |
3710 | break; | |
3711 | } | |
3712 | ||
3713 | /* If a condition was negated, invert OK/FAIL. */ | |
3714 | ||
2d009132 | 3715 | if (!conditions[cb->type].is_modifier && cb->u.negated) |
059ec3d9 | 3716 | if (rc == OK) rc = FAIL; |
2d009132 | 3717 | else if (rc == FAIL || rc == FAIL_DROP) rc = OK; |
059ec3d9 PH |
3718 | |
3719 | if (rc != OK) break; /* Conditions loop */ | |
3720 | } | |
3721 | ||
3722 | ||
3723 | /* If the result is the one for which "message" and/or "log_message" are used, | |
4e88a19f PH |
3724 | handle the values of these modifiers. If there isn't a log message set, we make |
3725 | it the same as the user message. | |
059ec3d9 PH |
3726 | |
3727 | "message" is a user message that will be included in an SMTP response. Unless | |
3728 | it is empty, it overrides any previously set user message. | |
3729 | ||
3730 | "log_message" is a non-user message, and it adds to any existing non-user | |
3731 | message that is already set. | |
3732 | ||
4e88a19f PH |
3733 | Most verbs have but a single return for which the messages are relevant, but |
3734 | for "discard", it's useful to have the log message both when it succeeds and | |
3735 | when it fails. For "accept", the message is used in the OK case if there is no | |
3736 | "endpass", but (for backwards compatibility) in the FAIL case if "endpass" is | |
3737 | present. */ | |
059ec3d9 | 3738 | |
4e88a19f PH |
3739 | if (*epp && rc == OK) user_message = NULL; |
3740 | ||
e3a69b62 | 3741 | if ((BIT(rc) & msgcond[verb]) != 0) |
059ec3d9 PH |
3742 | { |
3743 | uschar *expmessage; | |
4e88a19f PH |
3744 | uschar *old_user_msgptr = *user_msgptr; |
3745 | uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr; | |
059ec3d9 PH |
3746 | |
3747 | /* If the verb is "warn", messages generated by conditions (verification or | |
4e88a19f PH |
3748 | nested ACLs) are always discarded. This also happens for acceptance verbs |
3749 | when they actually do accept. Only messages specified at this level are used. | |
059ec3d9 PH |
3750 | However, the value of an existing message is available in $acl_verify_message |
3751 | during expansions. */ | |
3752 | ||
4e88a19f PH |
3753 | if (verb == ACL_WARN || |
3754 | (rc == OK && (verb == ACL_ACCEPT || verb == ACL_DISCARD))) | |
3755 | *log_msgptr = *user_msgptr = NULL; | |
059ec3d9 | 3756 | |
e3a69b62 | 3757 | if (user_message) |
059ec3d9 PH |
3758 | { |
3759 | acl_verify_message = old_user_msgptr; | |
3760 | expmessage = expand_string(user_message); | |
e3a69b62 | 3761 | if (!expmessage) |
059ec3d9 PH |
3762 | { |
3763 | if (!expand_string_forcedfail) | |
3764 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3765 | user_message, expand_string_message); | |
3766 | } | |
3767 | else if (expmessage[0] != 0) *user_msgptr = expmessage; | |
3768 | } | |
3769 | ||
e3a69b62 | 3770 | if (log_message) |
059ec3d9 PH |
3771 | { |
3772 | acl_verify_message = old_log_msgptr; | |
3773 | expmessage = expand_string(log_message); | |
e3a69b62 | 3774 | if (!expmessage) |
059ec3d9 PH |
3775 | { |
3776 | if (!expand_string_forcedfail) | |
3777 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3778 | log_message, expand_string_message); | |
3779 | } | |
3780 | else if (expmessage[0] != 0) | |
3781 | { | |
3782 | *log_msgptr = (*log_msgptr == NULL)? expmessage : | |
3783 | string_sprintf("%s: %s", expmessage, *log_msgptr); | |
3784 | } | |
3785 | } | |
3786 | ||
3787 | /* If no log message, default it to the user message */ | |
3788 | ||
e3a69b62 | 3789 | if (!*log_msgptr) *log_msgptr = *user_msgptr; |
059ec3d9 PH |
3790 | } |
3791 | ||
3792 | acl_verify_message = NULL; | |
3793 | return rc; | |
3794 | } | |
3795 | ||
3796 | ||
3797 | ||
3798 | ||
3799 | ||
3800 | /************************************************* | |
3801 | * Get line from a literal ACL * | |
3802 | *************************************************/ | |
3803 | ||
3804 | /* This function is passed to acl_read() in order to extract individual lines | |
3805 | of a literal ACL, which we access via static pointers. We can destroy the | |
3806 | contents because this is called only once (the compiled ACL is remembered). | |
3807 | ||
3808 | This code is intended to treat the data in the same way as lines in the main | |
3809 | Exim configuration file. That is: | |
3810 | ||
3811 | . Leading spaces are ignored. | |
3812 | ||
3813 | . A \ at the end of a line is a continuation - trailing spaces after the \ | |
3814 | are permitted (this is because I don't believe in making invisible things | |
3815 | significant). Leading spaces on the continued part of a line are ignored. | |
3816 | ||
3817 | . Physical lines starting (significantly) with # are totally ignored, and | |
3818 | may appear within a sequence of backslash-continued lines. | |
3819 | ||
3820 | . Blank lines are ignored, but will end a sequence of continuations. | |
3821 | ||
3822 | Arguments: none | |
3823 | Returns: a pointer to the next line | |
3824 | */ | |
3825 | ||
3826 | ||
3827 | static uschar *acl_text; /* Current pointer in the text */ | |
3828 | static uschar *acl_text_end; /* Points one past the terminating '0' */ | |
3829 | ||
3830 | ||
3831 | static uschar * | |
3832 | acl_getline(void) | |
3833 | { | |
3834 | uschar *yield; | |
3835 | ||
3836 | /* This loop handles leading blank lines and comments. */ | |
3837 | ||
3838 | for(;;) | |
3839 | { | |
3840 | while (isspace(*acl_text)) acl_text++; /* Leading spaces/empty lines */ | |
3841 | if (*acl_text == 0) return NULL; /* No more data */ | |
3842 | yield = acl_text; /* Potential data line */ | |
3843 | ||
3844 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3845 | ||
3846 | /* If we hit the end before a newline, we have the whole logical line. If | |
3847 | it's a comment, there's no more data to be given. Otherwise, yield it. */ | |
3848 | ||
3849 | if (*acl_text == 0) return (*yield == '#')? NULL : yield; | |
3850 | ||
3851 | /* After reaching a newline, end this loop if the physical line does not | |
3852 | start with '#'. If it does, it's a comment, and the loop continues. */ | |
3853 | ||
3854 | if (*yield != '#') break; | |
3855 | } | |
3856 | ||
3857 | /* This loop handles continuations. We know we have some real data, ending in | |
3858 | newline. See if there is a continuation marker at the end (ignoring trailing | |
3859 | white space). We know that *yield is not white space, so no need to test for | |
3860 | cont > yield in the backwards scanning loop. */ | |
3861 | ||
3862 | for(;;) | |
3863 | { | |
3864 | uschar *cont; | |
3865 | for (cont = acl_text - 1; isspace(*cont); cont--); | |
3866 | ||
3867 | /* If no continuation follows, we are done. Mark the end of the line and | |
3868 | return it. */ | |
3869 | ||
3870 | if (*cont != '\\') | |
3871 | { | |
3872 | *acl_text++ = 0; | |
3873 | return yield; | |
3874 | } | |
3875 | ||
3876 | /* We have encountered a continuation. Skip over whitespace at the start of | |
3877 | the next line, and indeed the whole of the next line or lines if they are | |
3878 | comment lines. */ | |
3879 | ||
3880 | for (;;) | |
3881 | { | |
3882 | while (*(++acl_text) == ' ' || *acl_text == '\t'); | |
3883 | if (*acl_text != '#') break; | |
3884 | while (*(++acl_text) != 0 && *acl_text != '\n'); | |
3885 | } | |
3886 | ||
3887 | /* We have the start of a continuation line. Move all the rest of the data | |
3888 | to join onto the previous line, and then find its end. If the end is not a | |
3889 | newline, we are done. Otherwise loop to look for another continuation. */ | |
3890 | ||
3891 | memmove(cont, acl_text, acl_text_end - acl_text); | |
3892 | acl_text_end -= acl_text - cont; | |
3893 | acl_text = cont; | |
3894 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3895 | if (*acl_text == 0) return yield; | |
3896 | } | |
3897 | ||
3898 | /* Control does not reach here */ | |
3899 | } | |
3900 | ||
3901 | ||
3902 | ||
3903 | ||
3904 | ||
3905 | /************************************************* | |
3906 | * Check access using an ACL * | |
3907 | *************************************************/ | |
3908 | ||
3909 | /* This function is called from address_check. It may recurse via | |
3910 | acl_check_condition() - hence the use of a level to stop looping. The ACL is | |
3911 | passed as a string which is expanded. A forced failure implies no access check | |
3912 | is required. If the result is a single word, it is taken as the name of an ACL | |
3913 | which is sought in the global ACL tree. Otherwise, it is taken as literal ACL | |
3914 | text, complete with newlines, and parsed as such. In both cases, the ACL check | |
3915 | is then run. This function uses an auxiliary function for acl_read() to call | |
3916 | for reading individual lines of a literal ACL. This is acl_getline(), which | |
3917 | appears immediately above. | |
3918 | ||
3919 | Arguments: | |
3920 | where where called from | |
3921 | addr address item when called from RCPT; otherwise NULL | |
3922 | s the input string; NULL is the same as an empty ACL => DENY | |
059ec3d9 PH |
3923 | user_msgptr where to put a user error (for SMTP response) |
3924 | log_msgptr where to put a logging message (not for SMTP response) | |
3925 | ||
3926 | Returns: OK access is granted | |
3927 | DISCARD access is apparently granted... | |
3928 | FAIL access is denied | |
3929 | FAIL_DROP access is denied; drop the connection | |
3930 | DEFER can't tell at the moment | |
3931 | ERROR disaster | |
3932 | */ | |
3933 | ||
3934 | static int | |
e1d04f48 | 3935 | acl_check_internal(int where, address_item *addr, uschar *s, |
059ec3d9 PH |
3936 | uschar **user_msgptr, uschar **log_msgptr) |
3937 | { | |
3938 | int fd = -1; | |
3939 | acl_block *acl = NULL; | |
3940 | uschar *acl_name = US"inline ACL"; | |
3941 | uschar *ss; | |
3942 | ||
3943 | /* Catch configuration loops */ | |
3944 | ||
e1d04f48 | 3945 | if (acl_level > 20) |
059ec3d9 PH |
3946 | { |
3947 | *log_msgptr = US"ACL nested too deep: possible loop"; | |
3948 | return ERROR; | |
3949 | } | |
3950 | ||
e1d04f48 | 3951 | if (!s) |
059ec3d9 | 3952 | { |
e1d04f48 | 3953 | HDEBUG(D_acl) debug_printf_indent("ACL is NULL: implicit DENY\n"); |
059ec3d9 PH |
3954 | return FAIL; |
3955 | } | |
3956 | ||
3957 | /* At top level, we expand the incoming string. At lower levels, it has already | |
3958 | been expanded as part of condition processing. */ | |
3959 | ||
e1d04f48 | 3960 | if (acl_level == 0) |
059ec3d9 | 3961 | { |
e1d04f48 | 3962 | if (!(ss = expand_string(s))) |
059ec3d9 PH |
3963 | { |
3964 | if (expand_string_forcedfail) return OK; | |
3965 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s, | |
3966 | expand_string_message); | |
3967 | return ERROR; | |
3968 | } | |
3969 | } | |
3970 | else ss = s; | |
3971 | ||
bb07bcd3 | 3972 | while (isspace(*ss)) ss++; |
059ec3d9 PH |
3973 | |
3974 | /* If we can't find a named ACL, the default is to parse it as an inline one. | |
3975 | (Unless it begins with a slash; non-existent files give rise to an error.) */ | |
3976 | ||
3977 | acl_text = ss; | |
3978 | ||
3979 | /* Handle the case of a string that does not contain any spaces. Look for a | |
3980 | named ACL among those read from the configuration, or a previously read file. | |
3981 | It is possible that the pointer to the ACL is NULL if the configuration | |
3982 | contains a name with no data. If not found, and the text begins with '/', | |
3983 | read an ACL from a file, and save it so it can be re-used. */ | |
3984 | ||
3985 | if (Ustrchr(ss, ' ') == NULL) | |
3986 | { | |
3987 | tree_node *t = tree_search(acl_anchor, ss); | |
3988 | if (t != NULL) | |
3989 | { | |
3990 | acl = (acl_block *)(t->data.ptr); | |
3991 | if (acl == NULL) | |
3992 | { | |
e1d04f48 | 3993 | HDEBUG(D_acl) debug_printf_indent("ACL \"%s\" is empty: implicit DENY\n", ss); |
059ec3d9 PH |
3994 | return FAIL; |
3995 | } | |
3996 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
e1d04f48 | 3997 | HDEBUG(D_acl) debug_printf_indent("using ACL \"%s\"\n", ss); |
059ec3d9 PH |
3998 | } |
3999 | ||
4000 | else if (*ss == '/') | |
4001 | { | |
4002 | struct stat statbuf; | |
4003 | fd = Uopen(ss, O_RDONLY, 0); | |
4004 | if (fd < 0) | |
4005 | { | |
4006 | *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss, | |
4007 | strerror(errno)); | |
4008 | return ERROR; | |
4009 | } | |
4010 | ||
4011 | if (fstat(fd, &statbuf) != 0) | |
4012 | { | |
4013 | *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss, | |
4014 | strerror(errno)); | |
4015 | return ERROR; | |
4016 | } | |
4017 | ||
4018 | acl_text = store_get(statbuf.st_size + 1); | |
4019 | acl_text_end = acl_text + statbuf.st_size + 1; | |
4020 | ||
4021 | if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size) | |
4022 | { | |
4023 | *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s", | |
4024 | ss, strerror(errno)); | |
4025 | return ERROR; | |
4026 | } | |
4027 | acl_text[statbuf.st_size] = 0; | |
f1e894f3 | 4028 | (void)close(fd); |
059ec3d9 PH |
4029 | |
4030 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
e1d04f48 | 4031 | HDEBUG(D_acl) debug_printf_indent("read ACL from file %s\n", ss); |
059ec3d9 PH |
4032 | } |
4033 | } | |
4034 | ||
4035 | /* Parse an ACL that is still in text form. If it came from a file, remember it | |
4036 | in the ACL tree, having read it into the POOL_PERM store pool so that it | |
4037 | persists between multiple messages. */ | |
4038 | ||
4039 | if (acl == NULL) | |
4040 | { | |
4041 | int old_pool = store_pool; | |
4042 | if (fd >= 0) store_pool = POOL_PERM; | |
4043 | acl = acl_read(acl_getline, log_msgptr); | |
4044 | store_pool = old_pool; | |
4045 | if (acl == NULL && *log_msgptr != NULL) return ERROR; | |
4046 | if (fd >= 0) | |
4047 | { | |
4048 | tree_node *t = store_get_perm(sizeof(tree_node) + Ustrlen(ss)); | |
4049 | Ustrcpy(t->name, ss); | |
4050 | t->data.ptr = acl; | |
4051 | (void)tree_insertnode(&acl_anchor, t); | |
4052 | } | |
4053 | } | |
4054 | ||
4055 | /* Now we have an ACL to use. It's possible it may be NULL. */ | |
4056 | ||
4057 | while (acl != NULL) | |
4058 | { | |
4059 | int cond; | |
4060 | int basic_errno = 0; | |
4061 | BOOL endpass_seen = FALSE; | |
e1d04f48 | 4062 | BOOL acl_quit_check = acl_level == 0 |
82c0c8ea | 4063 | && (where == ACL_WHERE_QUIT || where == ACL_WHERE_NOTQUIT); |
059ec3d9 PH |
4064 | |
4065 | *log_msgptr = *user_msgptr = NULL; | |
4066 | acl_temp_details = FALSE; | |
4067 | ||
e1d04f48 | 4068 | HDEBUG(D_acl) debug_printf_indent("processing \"%s\"\n", verbs[acl->verb]); |
059ec3d9 PH |
4069 | |
4070 | /* Clear out any search error message from a previous check before testing | |
4071 | this condition. */ | |
4072 | ||
4073 | search_error_message = NULL; | |
e1d04f48 | 4074 | cond = acl_check_condition(acl->verb, acl->condition, where, addr, acl_level, |
059ec3d9 PH |
4075 | &endpass_seen, user_msgptr, log_msgptr, &basic_errno); |
4076 | ||
4077 | /* Handle special returns: DEFER causes a return except on a WARN verb; | |
4078 | ERROR always causes a return. */ | |
4079 | ||
4080 | switch (cond) | |
4081 | { | |
4082 | case DEFER: | |
e1d04f48 | 4083 | HDEBUG(D_acl) debug_printf_indent("%s: condition test deferred in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4084 | if (basic_errno != ERRNO_CALLOUTDEFER) |
4085 | { | |
4086 | if (search_error_message != NULL && *search_error_message != 0) | |
4087 | *log_msgptr = search_error_message; | |
4088 | if (smtp_return_error_details) acl_temp_details = TRUE; | |
4089 | } | |
4090 | else | |
4091 | { | |
4092 | acl_temp_details = TRUE; | |
4093 | } | |
4094 | if (acl->verb != ACL_WARN) return DEFER; | |
4095 | break; | |
4096 | ||
4097 | default: /* Paranoia */ | |
4098 | case ERROR: | |
e1d04f48 | 4099 | HDEBUG(D_acl) debug_printf_indent("%s: condition test error in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4100 | return ERROR; |
4101 | ||
4102 | case OK: | |
e1d04f48 | 4103 | HDEBUG(D_acl) debug_printf_indent("%s: condition test succeeded in %s\n", |
6968512f | 4104 | verbs[acl->verb], acl_name); |
059ec3d9 PH |
4105 | break; |
4106 | ||
4107 | case FAIL: | |
e1d04f48 | 4108 | HDEBUG(D_acl) debug_printf_indent("%s: condition test failed in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4109 | break; |
4110 | ||
4111 | /* DISCARD and DROP can happen only from a nested ACL condition, and | |
4112 | DISCARD can happen only for an "accept" or "discard" verb. */ | |
4113 | ||
4114 | case DISCARD: | |
e1d04f48 | 4115 | HDEBUG(D_acl) debug_printf_indent("%s: condition test yielded \"discard\" in %s\n", |
6968512f | 4116 | verbs[acl->verb], acl_name); |
059ec3d9 PH |
4117 | break; |
4118 | ||
4119 | case FAIL_DROP: | |
e1d04f48 | 4120 | HDEBUG(D_acl) debug_printf_indent("%s: condition test yielded \"drop\" in %s\n", |
6968512f | 4121 | verbs[acl->verb], acl_name); |
059ec3d9 PH |
4122 | break; |
4123 | } | |
4124 | ||
4125 | /* At this point, cond for most verbs is either OK or FAIL or (as a result of | |
4126 | a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and | |
4127 | for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */ | |
4128 | ||
4129 | switch(acl->verb) | |
4130 | { | |
4131 | case ACL_ACCEPT: | |
a7538db1 JH |
4132 | if (cond == OK || cond == DISCARD) |
4133 | { | |
e1d04f48 | 4134 | HDEBUG(D_acl) debug_printf_indent("end of %s: ACCEPT\n", acl_name); |
a7538db1 JH |
4135 | return cond; |
4136 | } | |
059ec3d9 PH |
4137 | if (endpass_seen) |
4138 | { | |
e1d04f48 | 4139 | HDEBUG(D_acl) debug_printf_indent("accept: endpass encountered - denying access\n"); |
059ec3d9 PH |
4140 | return cond; |
4141 | } | |
4142 | break; | |
4143 | ||
4144 | case ACL_DEFER: | |
4145 | if (cond == OK) | |
4146 | { | |
e1d04f48 | 4147 | HDEBUG(D_acl) debug_printf_indent("end of %s: DEFER\n", acl_name); |
82c0c8ea | 4148 | if (acl_quit_check) goto badquit; |
059ec3d9 PH |
4149 | acl_temp_details = TRUE; |
4150 | return DEFER; | |
4151 | } | |
4152 | break; | |
4153 | ||
4154 | case ACL_DENY: | |
a7538db1 JH |
4155 | if (cond == OK) |
4156 | { | |
e1d04f48 | 4157 | HDEBUG(D_acl) debug_printf_indent("end of %s: DENY\n", acl_name); |
82c0c8ea | 4158 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4159 | return FAIL; |
4160 | } | |
059ec3d9 PH |
4161 | break; |
4162 | ||
4163 | case ACL_DISCARD: | |
a7538db1 JH |
4164 | if (cond == OK || cond == DISCARD) |
4165 | { | |
e1d04f48 | 4166 | HDEBUG(D_acl) debug_printf_indent("end of %s: DISCARD\n", acl_name); |
82c0c8ea | 4167 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4168 | return DISCARD; |
4169 | } | |
059ec3d9 PH |
4170 | if (endpass_seen) |
4171 | { | |
e1d04f48 | 4172 | HDEBUG(D_acl) debug_printf_indent("discard: endpass encountered - denying access\n"); |
059ec3d9 PH |
4173 | return cond; |
4174 | } | |
4175 | break; | |
4176 | ||
4177 | case ACL_DROP: | |
a7538db1 JH |
4178 | if (cond == OK) |
4179 | { | |
e1d04f48 | 4180 | HDEBUG(D_acl) debug_printf_indent("end of %s: DROP\n", acl_name); |
82c0c8ea | 4181 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4182 | return FAIL_DROP; |
4183 | } | |
059ec3d9 PH |
4184 | break; |
4185 | ||
4186 | case ACL_REQUIRE: | |
a7538db1 JH |
4187 | if (cond != OK) |
4188 | { | |
e1d04f48 | 4189 | HDEBUG(D_acl) debug_printf_indent("end of %s: not OK\n", acl_name); |
82c0c8ea | 4190 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4191 | return cond; |
4192 | } | |
059ec3d9 PH |
4193 | break; |
4194 | ||
4195 | case ACL_WARN: | |
4196 | if (cond == OK) | |
4197 | acl_warn(where, *user_msgptr, *log_msgptr); | |
6c6d6e48 | 4198 | else if (cond == DEFER && LOGGING(acl_warn_skipped)) |
9c7a242c PH |
4199 | log_write(0, LOG_MAIN, "%s Warning: ACL \"warn\" statement skipped: " |
4200 | "condition test deferred%s%s", host_and_ident(TRUE), | |
4201 | (*log_msgptr == NULL)? US"" : US": ", | |
4202 | (*log_msgptr == NULL)? US"" : *log_msgptr); | |
059ec3d9 PH |
4203 | *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */ |
4204 | break; | |
4205 | ||
4206 | default: | |
4207 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d", | |
4208 | acl->verb); | |
4209 | break; | |
4210 | } | |
4211 | ||
4212 | /* Pass to the next ACL item */ | |
4213 | ||
4214 | acl = acl->next; | |
4215 | } | |
4216 | ||
4217 | /* We have reached the end of the ACL. This is an implicit DENY. */ | |
4218 | ||
e1d04f48 | 4219 | HDEBUG(D_acl) debug_printf_indent("end of %s: implicit DENY\n", acl_name); |
059ec3d9 | 4220 | return FAIL; |
82c0c8ea JH |
4221 | |
4222 | badquit: | |
4c04137d | 4223 | *log_msgptr = string_sprintf("QUIT or not-QUIT toplevel ACL may not fail " |
82c0c8ea JH |
4224 | "('%s' verb used incorrectly)", verbs[acl->verb]); |
4225 | return ERROR; | |
059ec3d9 PH |
4226 | } |
4227 | ||
4228 | ||
333eea9c JH |
4229 | |
4230 | ||
4231 | /* Same args as acl_check_internal() above, but the string s is | |
4232 | the name of an ACL followed optionally by up to 9 space-separated arguments. | |
4233 | The name and args are separately expanded. Args go into $acl_arg globals. */ | |
f60d98e8 | 4234 | static int |
e1d04f48 | 4235 | acl_check_wargs(int where, address_item *addr, const uschar *s, |
333eea9c JH |
4236 | uschar **user_msgptr, uschar **log_msgptr) |
4237 | { | |
4238 | uschar * tmp; | |
bef3ea7f | 4239 | uschar * tmp_arg[9]; /* must match acl_arg[] */ |
ef21c07d JH |
4240 | uschar * sav_arg[9]; /* must match acl_arg[] */ |
4241 | int sav_narg; | |
333eea9c | 4242 | uschar * name; |
bef3ea7f | 4243 | int i; |
ef21c07d | 4244 | int ret; |
333eea9c JH |
4245 | |
4246 | if (!(tmp = string_dequote(&s)) || !(name = expand_string(tmp))) | |
4247 | goto bad; | |
4248 | ||
bef3ea7f | 4249 | for (i = 0; i < 9; i++) |
333eea9c JH |
4250 | { |
4251 | while (*s && isspace(*s)) s++; | |
4252 | if (!*s) break; | |
bef3ea7f | 4253 | if (!(tmp = string_dequote(&s)) || !(tmp_arg[i] = expand_string(tmp))) |
333eea9c JH |
4254 | { |
4255 | tmp = name; | |
4256 | goto bad; | |
4257 | } | |
4258 | } | |
ef21c07d JH |
4259 | |
4260 | sav_narg = acl_narg; | |
bef3ea7f | 4261 | acl_narg = i; |
ef21c07d JH |
4262 | for (i = 0; i < acl_narg; i++) |
4263 | { | |
4264 | sav_arg[i] = acl_arg[i]; | |
4265 | acl_arg[i] = tmp_arg[i]; | |
4266 | } | |
4267 | while (i < 9) | |
4268 | { | |
4269 | sav_arg[i] = acl_arg[i]; | |
4270 | acl_arg[i++] = NULL; | |
4271 | } | |
4272 | ||
e1d04f48 JH |
4273 | acl_level++; |
4274 | ret = acl_check_internal(where, addr, name, user_msgptr, log_msgptr); | |
4275 | acl_level--; | |
333eea9c | 4276 | |
ef21c07d JH |
4277 | acl_narg = sav_narg; |
4278 | for (i = 0; i < 9; i++) acl_arg[i] = sav_arg[i]; | |
4279 | return ret; | |
333eea9c JH |
4280 | |
4281 | bad: | |
4282 | if (expand_string_forcedfail) return ERROR; | |
4283 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
4284 | tmp, expand_string_message); | |
4285 | return search_find_defer?DEFER:ERROR; | |
4286 | } | |
4287 | ||
4288 | ||
4289 | ||
059ec3d9 PH |
4290 | /************************************************* |
4291 | * Check access using an ACL * | |
4292 | *************************************************/ | |
4293 | ||
faa05a93 JH |
4294 | /* Alternate interface for ACL, used by expansions */ |
4295 | int | |
05caaeaa | 4296 | acl_eval(int where, uschar *s, uschar **user_msgptr, uschar **log_msgptr) |
faa05a93 | 4297 | { |
faa05a93 JH |
4298 | address_item adb; |
4299 | address_item *addr = NULL; | |
e1d04f48 | 4300 | int rc; |
faa05a93 JH |
4301 | |
4302 | *user_msgptr = *log_msgptr = NULL; | |
4303 | sender_verified_failed = NULL; | |
4304 | ratelimiters_cmd = NULL; | |
4305 | log_reject_target = LOG_MAIN|LOG_REJECT; | |
4306 | ||
4307 | if (where == ACL_WHERE_RCPT) | |
4308 | { | |
4309 | adb = address_defaults; | |
4310 | addr = &adb; | |
05caaeaa JH |
4311 | addr->address = expand_string(US"$local_part@$domain"); |
4312 | addr->domain = deliver_domain; | |
4313 | addr->local_part = deliver_localpart; | |
4314 | addr->cc_local_part = deliver_localpart; | |
4315 | addr->lc_local_part = deliver_localpart; | |
faa05a93 JH |
4316 | } |
4317 | ||
e1d04f48 JH |
4318 | acl_level++; |
4319 | rc = acl_check_internal(where, addr, s, user_msgptr, log_msgptr); | |
4320 | acl_level--; | |
4321 | return rc; | |
faa05a93 JH |
4322 | } |
4323 | ||
4324 | ||
4325 | ||
059ec3d9 PH |
4326 | /* This is the external interface for ACL checks. It sets up an address and the |
4327 | expansions for $domain and $local_part when called after RCPT, then calls | |
4328 | acl_check_internal() to do the actual work. | |
4329 | ||
4330 | Arguments: | |
4331 | where ACL_WHERE_xxxx indicating where called from | |
64ffc24f | 4332 | recipient RCPT address for RCPT check, else NULL |
059ec3d9 PH |
4333 | s the input string; NULL is the same as an empty ACL => DENY |
4334 | user_msgptr where to put a user error (for SMTP response) | |
4335 | log_msgptr where to put a logging message (not for SMTP response) | |
4336 | ||
4337 | Returns: OK access is granted by an ACCEPT verb | |
4338 | DISCARD access is granted by a DISCARD verb | |
4339 | FAIL access is denied | |
4340 | FAIL_DROP access is denied; drop the connection | |
4341 | DEFER can't tell at the moment | |
4342 | ERROR disaster | |
4343 | */ | |
faa05a93 | 4344 | int acl_where = ACL_WHERE_UNKNOWN; |
059ec3d9 PH |
4345 | |
4346 | int | |
64ffc24f | 4347 | acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr, |
059ec3d9 PH |
4348 | uschar **log_msgptr) |
4349 | { | |
4350 | int rc; | |
4351 | address_item adb; | |
64ffc24f | 4352 | address_item *addr = NULL; |
059ec3d9 PH |
4353 | |
4354 | *user_msgptr = *log_msgptr = NULL; | |
4355 | sender_verified_failed = NULL; | |
fe0dab11 | 4356 | ratelimiters_cmd = NULL; |
6ea85e9a | 4357 | log_reject_target = LOG_MAIN|LOG_REJECT; |
059ec3d9 | 4358 | |
8ccd00b1 | 4359 | #ifndef DISABLE_PRDR |
4f6ae5c3 | 4360 | if (where==ACL_WHERE_RCPT || where==ACL_WHERE_VRFY || where==ACL_WHERE_PRDR) |
fd98a5c6 | 4361 | #else |
4f6ae5c3 | 4362 | if (where==ACL_WHERE_RCPT || where==ACL_WHERE_VRFY) |
fd98a5c6 | 4363 | #endif |
059ec3d9 PH |
4364 | { |
4365 | adb = address_defaults; | |
4366 | addr = &adb; | |
64ffc24f | 4367 | addr->address = recipient; |
059ec3d9 PH |
4368 | if (deliver_split_address(addr) == DEFER) |
4369 | { | |
4370 | *log_msgptr = US"defer in percent_hack_domains check"; | |
4371 | return DEFER; | |
4372 | } | |
8c5d388a | 4373 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
4374 | if ((addr->prop.utf8_msg = message_smtputf8)) |
4375 | { | |
4376 | addr->prop.utf8_downcvt = message_utf8_downconvert == 1; | |
4377 | addr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1; | |
4378 | } | |
9bfc60eb | 4379 | #endif |
059ec3d9 PH |
4380 | deliver_domain = addr->domain; |
4381 | deliver_localpart = addr->local_part; | |
4382 | } | |
059ec3d9 | 4383 | |
faa05a93 | 4384 | acl_where = where; |
e1d04f48 JH |
4385 | acl_level = 0; |
4386 | rc = acl_check_internal(where, addr, s, user_msgptr, log_msgptr); | |
4387 | acl_level = 0; | |
faa05a93 | 4388 | acl_where = ACL_WHERE_UNKNOWN; |
059ec3d9 | 4389 | |
817d9f57 JH |
4390 | /* Cutthrough - if requested, |
4391 | and WHERE_RCPT and not yet opened conn as result of recipient-verify, | |
4392 | and rcpt acl returned accept, | |
4393 | and first recipient (cancel on any subsequents) | |
e4bdf652 | 4394 | open one now and run it up to RCPT acceptance. |
f9334a28 JH |
4395 | A failed verify should cancel cutthrough request, |
4396 | and will pass the fail to the originator. | |
817d9f57 | 4397 | Initial implementation: dual-write to spool. |
e4bdf652 JH |
4398 | Assume the rxd datastream is now being copied byte-for-byte to an open cutthrough connection. |
4399 | ||
4400 | Cease cutthrough copy on rxd final dot; do not send one. | |
4401 | ||
4402 | On a data acl, if not accept and a cutthrough conn is open, hard-close it (no SMTP niceness). | |
4403 | ||
4404 | On data acl accept, terminate the dataphase on an open cutthrough conn. If accepted or | |
4405 | perm-rejected, reflect that to the original sender - and dump the spooled copy. | |
4406 | If temp-reject, close the conn (and keep the spooled copy). | |
4407 | If conn-failure, no action (and keep the spooled copy). | |
e4bdf652 JH |
4408 | */ |
4409 | switch (where) | |
ff5929e3 JH |
4410 | { |
4411 | case ACL_WHERE_RCPT: | |
8ccd00b1 | 4412 | #ifndef DISABLE_PRDR |
ff5929e3 | 4413 | case ACL_WHERE_PRDR: |
fd98a5c6 | 4414 | #endif |
57cc2785 | 4415 | |
ff5929e3 | 4416 | if (host_checking_callout) /* -bhc mode */ |
57cc2785 | 4417 | cancel_cutthrough_connection(TRUE, US"host-checking mode"); |
ff5929e3 JH |
4418 | |
4419 | else if ( rc == OK | |
4420 | && cutthrough.delivery | |
4421 | && rcpt_count > cutthrough.nrcpt | |
ff5929e3 | 4422 | ) |
06fdb9f7 JH |
4423 | { |
4424 | if ((rc = open_cutthrough_connection(addr)) == DEFER) | |
4425 | if (cutthrough.defer_pass) | |
4426 | { | |
4427 | uschar * s = addr->message; | |
4428 | /* Horrid kludge to recover target's SMTP message */ | |
4429 | while (*s) s++; | |
4430 | do --s; while (!isdigit(*s)); | |
4431 | if (*--s && isdigit(*s) && *--s && isdigit(*s)) *user_msgptr = s; | |
4432 | acl_temp_details = TRUE; | |
4433 | } | |
4434 | else | |
4435 | { | |
4436 | HDEBUG(D_acl) debug_printf_indent("cutthrough defer; will spool\n"); | |
4437 | rc = OK; | |
4438 | } | |
4439 | } | |
4440 | else HDEBUG(D_acl) if (cutthrough.delivery) | |
4441 | if (rcpt_count <= cutthrough.nrcpt) | |
4442 | debug_printf_indent("ignore cutthrough request; nonfirst message\n"); | |
4443 | else if (rc != OK) | |
4444 | debug_printf_indent("ignore cutthrough request; ACL did not accept\n"); | |
ff5929e3 | 4445 | break; |
e4bdf652 | 4446 | |
ff5929e3 JH |
4447 | case ACL_WHERE_PREDATA: |
4448 | if (rc == OK) | |
4449 | cutthrough_predata(); | |
4450 | else | |
57cc2785 | 4451 | cancel_cutthrough_connection(TRUE, US"predata acl not ok"); |
ff5929e3 | 4452 | break; |
e4bdf652 | 4453 | |
ff5929e3 JH |
4454 | case ACL_WHERE_QUIT: |
4455 | case ACL_WHERE_NOTQUIT: | |
57cc2785 JH |
4456 | /* Drop cutthrough conns, and drop heldopen verify conns if |
4457 | the previous was not DATA */ | |
4458 | { | |
4459 | uschar prev = smtp_connection_had[smtp_ch_index-2]; | |
4460 | BOOL dropverify = !(prev == SCH_DATA || prev == SCH_BDAT); | |
4461 | ||
4462 | cancel_cutthrough_connection(dropverify, US"quit or conndrop"); | |
ff5929e3 | 4463 | break; |
57cc2785 | 4464 | } |
e4bdf652 | 4465 | |
ff5929e3 JH |
4466 | default: |
4467 | break; | |
4468 | } | |
e4bdf652 | 4469 | |
64ffc24f PH |
4470 | deliver_domain = deliver_localpart = deliver_address_data = |
4471 | sender_address_data = NULL; | |
059ec3d9 PH |
4472 | |
4473 | /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA | |
4474 | ACL, which is really in the middle of an SMTP command. */ | |
4475 | ||
4476 | if (rc == DISCARD) | |
4477 | { | |
4478 | if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA) | |
4479 | { | |
4480 | log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s " | |
4481 | "ACL", acl_wherenames[where]); | |
4482 | return ERROR; | |
4483 | } | |
4484 | return DISCARD; | |
4485 | } | |
4486 | ||
4487 | /* A DROP response is not permitted from MAILAUTH */ | |
4488 | ||
4489 | if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH) | |
4490 | { | |
4491 | log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s " | |
4492 | "ACL", acl_wherenames[where]); | |
4493 | return ERROR; | |
4494 | } | |
4495 | ||
4e88a19f PH |
4496 | /* Before giving a response, take a look at the length of any user message, and |
4497 | split it up into multiple lines if possible. */ | |
059ec3d9 | 4498 | |
e28326d8 PH |
4499 | *user_msgptr = string_split_message(*user_msgptr); |
4500 | if (fake_response != OK) | |
4501 | fake_response_text = string_split_message(fake_response_text); | |
059ec3d9 PH |
4502 | |
4503 | return rc; | |
4504 | } | |
4505 | ||
38a0a95f | 4506 | |
38a0a95f PH |
4507 | /************************************************* |
4508 | * Create ACL variable * | |
4509 | *************************************************/ | |
4510 | ||
4511 | /* Create an ACL variable or reuse an existing one. ACL variables are in a | |
4512 | binary tree (see tree.c) with acl_var_c and acl_var_m as root nodes. | |
4513 | ||
4514 | Argument: | |
4515 | name pointer to the variable's name, starting with c or m | |
4516 | ||
4517 | Returns the pointer to variable's tree node | |
4518 | */ | |
4519 | ||
4520 | tree_node * | |
2c0f3ea1 | 4521 | acl_var_create(uschar * name) |
38a0a95f | 4522 | { |
2c0f3ea1 JH |
4523 | tree_node * node, ** root = name[0] == 'c' ? &acl_var_c : &acl_var_m; |
4524 | if (!(node = tree_search(*root, name))) | |
38a0a95f PH |
4525 | { |
4526 | node = store_get(sizeof(tree_node) + Ustrlen(name)); | |
4527 | Ustrcpy(node->name, name); | |
4528 | (void)tree_insertnode(root, node); | |
4529 | } | |
4530 | node->data.ptr = NULL; | |
4531 | return node; | |
4532 | } | |
4533 | ||
4534 | ||
4535 | ||
4536 | /************************************************* | |
4537 | * Write an ACL variable in spool format * | |
4538 | *************************************************/ | |
4539 | ||
4540 | /* This function is used as a callback for tree_walk when writing variables to | |
4541 | the spool file. To retain spool file compatibility, what is written is -aclc or | |
4542 | -aclm followed by the rest of the name and the data length, space separated, | |
4543 | then the value itself, starting on a new line, and terminated by an additional | |
4544 | newline. When we had only numbered ACL variables, the first line might look | |
4545 | like this: "-aclc 5 20". Now it might be "-aclc foo 20" for the variable called | |
4546 | acl_cfoo. | |
4547 | ||
4548 | Arguments: | |
4549 | name of the variable | |
4550 | value of the variable | |
4551 | ctx FILE pointer (as a void pointer) | |
4552 | ||
4553 | Returns: nothing | |
4554 | */ | |
4555 | ||
4556 | void | |
4557 | acl_var_write(uschar *name, uschar *value, void *ctx) | |
4558 | { | |
4559 | FILE *f = (FILE *)ctx; | |
4560 | fprintf(f, "-acl%c %s %d\n%s\n", name[0], name+1, Ustrlen(value), value); | |
4561 | } | |
4562 | ||
9171d434 JH |
4563 | /* vi: aw ai sw=2 |
4564 | */ | |
059ec3d9 | 4565 | /* End of acl.c */ |