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c46782ef | 1 | /* $Cambridge: exim/src/src/acl.c,v 1.56 2006/03/02 12:25:48 ph10 Exp $ */ |
059ec3d9 PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
d7d7b7b9 | 7 | /* Copyright (c) University of Cambridge 1995 - 2006 */ |
059ec3d9 PH |
8 | /* See the file NOTICE for conditions of use and distribution. */ |
9 | ||
10 | /* Code for handling Access Control Lists (ACLs) */ | |
11 | ||
12 | #include "exim.h" | |
13 | ||
14 | ||
15 | /* Default callout timeout */ | |
16 | ||
17 | #define CALLOUT_TIMEOUT_DEFAULT 30 | |
18 | ||
19 | /* ACL verb codes - keep in step with the table of verbs that follows */ | |
20 | ||
21 | enum { ACL_ACCEPT, ACL_DEFER, ACL_DENY, ACL_DISCARD, ACL_DROP, ACL_REQUIRE, | |
22 | ACL_WARN }; | |
23 | ||
24 | /* ACL verbs */ | |
25 | ||
26 | static uschar *verbs[] = | |
27 | { US"accept", US"defer", US"deny", US"discard", US"drop", US"require", | |
28 | US"warn" }; | |
29 | ||
30 | /* For each verb, the condition for which "message" is used */ | |
31 | ||
32 | static int msgcond[] = { FAIL, OK, OK, FAIL, OK, FAIL, OK }; | |
33 | ||
34 | /* ACL condition and modifier codes - keep in step with the table that | |
35 | follows. */ | |
36 | ||
8523533c TK |
37 | enum { ACLC_ACL, ACLC_AUTHENTICATED, |
38 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
39 | ACLC_BMI_OPTIN, | |
40 | #endif | |
41 | ACLC_CONDITION, ACLC_CONTROL, | |
42 | #ifdef WITH_CONTENT_SCAN | |
43 | ACLC_DECODE, | |
44 | #endif | |
45 | ACLC_DELAY, | |
46 | #ifdef WITH_OLD_DEMIME | |
47 | ACLC_DEMIME, | |
fb2274d4 TK |
48 | #endif |
49 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
50 | ACLC_DK_DOMAIN_SOURCE, | |
51 | ACLC_DK_POLICY, | |
52 | ACLC_DK_SENDER_DOMAINS, | |
53 | ACLC_DK_SENDER_LOCAL_PARTS, | |
54 | ACLC_DK_SENDERS, | |
55 | ACLC_DK_STATUS, | |
8e669ac1 | 56 | #endif |
8523533c TK |
57 | ACLC_DNSLISTS, ACLC_DOMAINS, ACLC_ENCRYPTED, ACLC_ENDPASS, |
58 | ACLC_HOSTS, ACLC_LOCAL_PARTS, ACLC_LOG_MESSAGE, ACLC_LOGWRITE, | |
59 | #ifdef WITH_CONTENT_SCAN | |
60 | ACLC_MALWARE, | |
61 | #endif | |
62 | ACLC_MESSAGE, | |
63 | #ifdef WITH_CONTENT_SCAN | |
64 | ACLC_MIME_REGEX, | |
65 | #endif | |
870f6ba8 | 66 | ACLC_RATELIMIT, |
8523533c TK |
67 | ACLC_RECIPIENTS, |
68 | #ifdef WITH_CONTENT_SCAN | |
69 | ACLC_REGEX, | |
70 | #endif | |
71 | ACLC_SENDER_DOMAINS, ACLC_SENDERS, ACLC_SET, | |
72 | #ifdef WITH_CONTENT_SCAN | |
8e669ac1 | 73 | ACLC_SPAM, |
8523533c TK |
74 | #endif |
75 | #ifdef EXPERIMENTAL_SPF | |
76 | ACLC_SPF, | |
77 | #endif | |
78 | ACLC_VERIFY }; | |
059ec3d9 PH |
79 | |
80 | /* ACL conditions/modifiers: "delay", "control", "endpass", "message", | |
81 | "log_message", "logwrite", and "set" are modifiers that look like conditions | |
82 | but always return TRUE. They are used for their side effects. */ | |
83 | ||
9a26b6b2 PH |
84 | static uschar *conditions[] = { |
85 | US"acl", | |
86 | US"authenticated", | |
8523533c TK |
87 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
88 | US"bmi_optin", | |
89 | #endif | |
90 | US"condition", | |
8e669ac1 | 91 | US"control", |
8523533c TK |
92 | #ifdef WITH_CONTENT_SCAN |
93 | US"decode", | |
94 | #endif | |
95 | US"delay", | |
96 | #ifdef WITH_OLD_DEMIME | |
97 | US"demime", | |
fb2274d4 TK |
98 | #endif |
99 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
7f45268c PH |
100 | US"dk_domain_source", |
101 | US"dk_policy", | |
102 | US"dk_sender_domains", | |
103 | US"dk_sender_local_parts", | |
104 | US"dk_senders", | |
105 | US"dk_status", | |
8523533c TK |
106 | #endif |
107 | US"dnslists", US"domains", US"encrypted", | |
059ec3d9 | 108 | US"endpass", US"hosts", US"local_parts", US"log_message", US"logwrite", |
8523533c TK |
109 | #ifdef WITH_CONTENT_SCAN |
110 | US"malware", | |
111 | #endif | |
112 | US"message", | |
113 | #ifdef WITH_CONTENT_SCAN | |
114 | US"mime_regex", | |
115 | #endif | |
870f6ba8 | 116 | US"ratelimit", |
8523533c TK |
117 | US"recipients", |
118 | #ifdef WITH_CONTENT_SCAN | |
119 | US"regex", | |
120 | #endif | |
121 | US"sender_domains", US"senders", US"set", | |
122 | #ifdef WITH_CONTENT_SCAN | |
123 | US"spam", | |
124 | #endif | |
125 | #ifdef EXPERIMENTAL_SPF | |
126 | US"spf", | |
127 | #endif | |
059ec3d9 | 128 | US"verify" }; |
8e669ac1 | 129 | |
c5fcb476 | 130 | |
9a26b6b2 PH |
131 | /* Return values from decode_control(); keep in step with the table of names |
132 | that follows! */ | |
133 | ||
134 | enum { | |
c46782ef PH |
135 | CONTROL_AUTH_UNADVERTISED, |
136 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
9a26b6b2 | 137 | CONTROL_BMI_RUN, |
c46782ef PH |
138 | #endif |
139 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
9a26b6b2 | 140 | CONTROL_DK_VERIFY, |
c46782ef PH |
141 | #endif |
142 | CONTROL_ERROR, | |
143 | CONTROL_CASEFUL_LOCAL_PART, | |
144 | CONTROL_CASELOWER_LOCAL_PART, | |
145 | CONTROL_ENFORCE_SYNC, | |
146 | CONTROL_NO_ENFORCE_SYNC, | |
147 | CONTROL_FREEZE, | |
148 | CONTROL_QUEUE_ONLY, | |
149 | CONTROL_SUBMISSION, | |
150 | CONTROL_SUPPRESS_LOCAL_FIXUPS, | |
151 | #ifdef WITH_CONTENT_SCAN | |
9a26b6b2 | 152 | CONTROL_NO_MBOX_UNSPOOL, |
c46782ef PH |
153 | #endif |
154 | CONTROL_FAKEDEFER, | |
155 | CONTROL_FAKEREJECT, | |
156 | CONTROL_NO_MULTILINE | |
157 | }; | |
9a26b6b2 | 158 | |
8800895a PH |
159 | /* ACL control names; keep in step with the table above! This list is used for |
160 | turning ids into names. The actual list of recognized names is in the variable | |
161 | control_def controls_list[] below. The fact that there are two lists is a mess | |
162 | and should be tidied up. */ | |
9a26b6b2 PH |
163 | |
164 | static uschar *controls[] = { | |
c46782ef | 165 | US"allow_auth_unadvertised", |
9a26b6b2 PH |
166 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
167 | US"bmi_run", | |
168 | #endif | |
169 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
170 | US"dk_verify", | |
171 | #endif | |
c46782ef PH |
172 | US"error", |
173 | US"caseful_local_part", | |
174 | US"caselower_local_part", | |
175 | US"enforce_sync", | |
176 | US"no_enforce_sync", | |
177 | US"freeze", | |
178 | US"queue_only", | |
179 | US"submission", | |
180 | US"suppress_local_fixups", | |
9a26b6b2 PH |
181 | #ifdef WITH_CONTENT_SCAN |
182 | US"no_mbox_unspool", | |
183 | #endif | |
c46782ef PH |
184 | US"no_multiline" |
185 | }; | |
059ec3d9 PH |
186 | |
187 | /* Flags to indicate for which conditions /modifiers a string expansion is done | |
188 | at the outer level. In the other cases, expansion already occurs in the | |
189 | checking functions. */ | |
190 | ||
191 | static uschar cond_expand_at_top[] = { | |
192 | TRUE, /* acl */ | |
193 | FALSE, /* authenticated */ | |
8523533c TK |
194 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
195 | TRUE, /* bmi_optin */ | |
8e669ac1 | 196 | #endif |
059ec3d9 PH |
197 | TRUE, /* condition */ |
198 | TRUE, /* control */ | |
8523533c TK |
199 | #ifdef WITH_CONTENT_SCAN |
200 | TRUE, /* decode */ | |
201 | #endif | |
059ec3d9 | 202 | TRUE, /* delay */ |
8523533c TK |
203 | #ifdef WITH_OLD_DEMIME |
204 | TRUE, /* demime */ | |
fb2274d4 TK |
205 | #endif |
206 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
7f45268c PH |
207 | TRUE, /* dk_domain_source */ |
208 | TRUE, /* dk_policy */ | |
209 | TRUE, /* dk_sender_domains */ | |
e715ad22 | 210 | TRUE, /* dk_sender_local_parts */ |
7f45268c PH |
211 | TRUE, /* dk_senders */ |
212 | TRUE, /* dk_status */ | |
8523533c | 213 | #endif |
059ec3d9 PH |
214 | TRUE, /* dnslists */ |
215 | FALSE, /* domains */ | |
216 | FALSE, /* encrypted */ | |
217 | TRUE, /* endpass */ | |
218 | FALSE, /* hosts */ | |
219 | FALSE, /* local_parts */ | |
220 | TRUE, /* log_message */ | |
221 | TRUE, /* logwrite */ | |
8523533c TK |
222 | #ifdef WITH_CONTENT_SCAN |
223 | TRUE, /* malware */ | |
224 | #endif | |
059ec3d9 | 225 | TRUE, /* message */ |
8523533c TK |
226 | #ifdef WITH_CONTENT_SCAN |
227 | TRUE, /* mime_regex */ | |
228 | #endif | |
870f6ba8 | 229 | TRUE, /* ratelimit */ |
059ec3d9 | 230 | FALSE, /* recipients */ |
8523533c TK |
231 | #ifdef WITH_CONTENT_SCAN |
232 | TRUE, /* regex */ | |
233 | #endif | |
059ec3d9 PH |
234 | FALSE, /* sender_domains */ |
235 | FALSE, /* senders */ | |
236 | TRUE, /* set */ | |
8523533c TK |
237 | #ifdef WITH_CONTENT_SCAN |
238 | TRUE, /* spam */ | |
239 | #endif | |
240 | #ifdef EXPERIMENTAL_SPF | |
241 | TRUE, /* spf */ | |
242 | #endif | |
059ec3d9 PH |
243 | TRUE /* verify */ |
244 | }; | |
245 | ||
246 | /* Flags to identify the modifiers */ | |
247 | ||
248 | static uschar cond_modifiers[] = { | |
249 | FALSE, /* acl */ | |
250 | FALSE, /* authenticated */ | |
8523533c TK |
251 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
252 | TRUE, /* bmi_optin */ | |
8e669ac1 | 253 | #endif |
059ec3d9 PH |
254 | FALSE, /* condition */ |
255 | TRUE, /* control */ | |
8523533c TK |
256 | #ifdef WITH_CONTENT_SCAN |
257 | FALSE, /* decode */ | |
258 | #endif | |
059ec3d9 | 259 | TRUE, /* delay */ |
8523533c TK |
260 | #ifdef WITH_OLD_DEMIME |
261 | FALSE, /* demime */ | |
fb2274d4 TK |
262 | #endif |
263 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
7f45268c PH |
264 | FALSE, /* dk_domain_source */ |
265 | FALSE, /* dk_policy */ | |
266 | FALSE, /* dk_sender_domains */ | |
e715ad22 | 267 | FALSE, /* dk_sender_local_parts */ |
7f45268c PH |
268 | FALSE, /* dk_senders */ |
269 | FALSE, /* dk_status */ | |
8523533c | 270 | #endif |
059ec3d9 PH |
271 | FALSE, /* dnslists */ |
272 | FALSE, /* domains */ | |
273 | FALSE, /* encrypted */ | |
274 | TRUE, /* endpass */ | |
275 | FALSE, /* hosts */ | |
276 | FALSE, /* local_parts */ | |
277 | TRUE, /* log_message */ | |
8523533c TK |
278 | TRUE, /* logwrite */ |
279 | #ifdef WITH_CONTENT_SCAN | |
280 | FALSE, /* malware */ | |
281 | #endif | |
059ec3d9 | 282 | TRUE, /* message */ |
8523533c TK |
283 | #ifdef WITH_CONTENT_SCAN |
284 | FALSE, /* mime_regex */ | |
285 | #endif | |
870f6ba8 | 286 | FALSE, /* ratelimit */ |
059ec3d9 | 287 | FALSE, /* recipients */ |
8523533c TK |
288 | #ifdef WITH_CONTENT_SCAN |
289 | FALSE, /* regex */ | |
290 | #endif | |
059ec3d9 PH |
291 | FALSE, /* sender_domains */ |
292 | FALSE, /* senders */ | |
293 | TRUE, /* set */ | |
8523533c TK |
294 | #ifdef WITH_CONTENT_SCAN |
295 | FALSE, /* spam */ | |
296 | #endif | |
297 | #ifdef EXPERIMENTAL_SPF | |
298 | FALSE, /* spf */ | |
299 | #endif | |
059ec3d9 PH |
300 | FALSE /* verify */ |
301 | }; | |
302 | ||
c5fcb476 | 303 | /* Bit map vector of which conditions are not allowed at certain times. For |
2f079f46 PH |
304 | each condition, there's a bitmap of dis-allowed times. For some, it is easier |
305 | to specify the negation of a small number of allowed times. */ | |
059ec3d9 PH |
306 | |
307 | static unsigned int cond_forbids[] = { | |
308 | 0, /* acl */ | |
8e669ac1 | 309 | |
059ec3d9 PH |
310 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_CONNECT)| /* authenticated */ |
311 | (1<<ACL_WHERE_HELO), | |
8e669ac1 | 312 | |
8523533c | 313 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
3864bb8e | 314 | (1<<ACL_WHERE_AUTH)| /* bmi_optin */ |
8523533c TK |
315 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
316 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_MIME)| | |
8e669ac1 | 317 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
8523533c TK |
318 | (1<<ACL_WHERE_MAILAUTH)| |
319 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
320 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_PREDATA), | |
321 | #endif | |
8e669ac1 | 322 | |
059ec3d9 | 323 | 0, /* condition */ |
8e669ac1 | 324 | |
059ec3d9 | 325 | /* Certain types of control are always allowed, so we let it through |
2f079f46 | 326 | always and check in the control processing itself. */ |
8e669ac1 | 327 | |
059ec3d9 | 328 | 0, /* control */ |
8e669ac1 | 329 | |
8523533c | 330 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
331 | (unsigned int) |
332 | ~(1<<ACL_WHERE_MIME), /* decode */ | |
8523533c TK |
333 | #endif |
334 | ||
059ec3d9 | 335 | 0, /* delay */ |
8e669ac1 | 336 | |
f7b63901 | 337 | #ifdef WITH_OLD_DEMIME |
2f079f46 PH |
338 | (unsigned int) |
339 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* demime */ | |
8523533c | 340 | #endif |
8e669ac1 | 341 | |
fb2274d4 | 342 | #ifdef EXPERIMENTAL_DOMAINKEYS |
2f079f46 | 343 | (1<<ACL_WHERE_AUTH)| /* dk_domain_source */ |
fb2274d4 TK |
344 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
345 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
346 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
347 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
348 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
349 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 350 | |
2f079f46 | 351 | (1<<ACL_WHERE_AUTH)| /* dk_policy */ |
fb2274d4 TK |
352 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
353 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
354 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
355 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
356 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
357 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 358 | |
2f079f46 | 359 | (1<<ACL_WHERE_AUTH)| /* dk_sender_domains */ |
fb2274d4 TK |
360 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
361 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
362 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
363 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
364 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
365 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 366 | |
2f079f46 | 367 | (1<<ACL_WHERE_AUTH)| /* dk_sender_local_parts */ |
fb2274d4 TK |
368 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
369 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
370 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
371 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
372 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
373 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 374 | |
2f079f46 | 375 | (1<<ACL_WHERE_AUTH)| /* dk_senders */ |
fb2274d4 TK |
376 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
377 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
378 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
379 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
380 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
381 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 382 | |
2f079f46 | 383 | (1<<ACL_WHERE_AUTH)| /* dk_status */ |
fb2274d4 TK |
384 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
385 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
386 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
387 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
388 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
389 | (1<<ACL_WHERE_VRFY), | |
390 | #endif | |
391 | ||
059ec3d9 PH |
392 | (1<<ACL_WHERE_NOTSMTP), /* dnslists */ |
393 | ||
2f079f46 PH |
394 | (unsigned int) |
395 | ~(1<<ACL_WHERE_RCPT), /* domains */ | |
059ec3d9 PH |
396 | |
397 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_CONNECT)| /* encrypted */ | |
398 | (1<<ACL_WHERE_HELO), | |
8e669ac1 | 399 | |
059ec3d9 | 400 | 0, /* endpass */ |
8e669ac1 | 401 | |
059ec3d9 PH |
402 | (1<<ACL_WHERE_NOTSMTP), /* hosts */ |
403 | ||
2f079f46 PH |
404 | (unsigned int) |
405 | ~(1<<ACL_WHERE_RCPT), /* local_parts */ | |
059ec3d9 PH |
406 | |
407 | 0, /* log_message */ | |
8e669ac1 | 408 | |
059ec3d9 | 409 | 0, /* logwrite */ |
8e669ac1 | 410 | |
8523533c | 411 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
412 | (unsigned int) |
413 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* malware */ | |
8523533c TK |
414 | #endif |
415 | ||
059ec3d9 PH |
416 | 0, /* message */ |
417 | ||
8523533c | 418 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
419 | (unsigned int) |
420 | ~(1<<ACL_WHERE_MIME), /* mime_regex */ | |
8523533c TK |
421 | #endif |
422 | ||
870f6ba8 TF |
423 | 0, /* ratelimit */ |
424 | ||
2f079f46 PH |
425 | (unsigned int) |
426 | ~(1<<ACL_WHERE_RCPT), /* recipients */ | |
059ec3d9 | 427 | |
8523533c | 428 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
429 | (unsigned int) |
430 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* regex */ | |
431 | (1<<ACL_WHERE_MIME)), | |
8523533c TK |
432 | #endif |
433 | ||
059ec3d9 PH |
434 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* sender_domains */ |
435 | (1<<ACL_WHERE_HELO)| | |
436 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
437 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
438 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
439 | ||
440 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* senders */ | |
441 | (1<<ACL_WHERE_HELO)| | |
442 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
443 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
444 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
445 | ||
446 | 0, /* set */ | |
447 | ||
8523533c | 448 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
449 | (unsigned int) |
450 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* spam */ | |
8523533c TK |
451 | #endif |
452 | ||
453 | #ifdef EXPERIMENTAL_SPF | |
454 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf */ | |
455 | (1<<ACL_WHERE_HELO)| | |
456 | (1<<ACL_WHERE_MAILAUTH)| | |
457 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
458 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
459 | #endif | |
460 | ||
059ec3d9 PH |
461 | /* Certain types of verify are always allowed, so we let it through |
462 | always and check in the verify function itself */ | |
463 | ||
464 | 0 /* verify */ | |
059ec3d9 PH |
465 | }; |
466 | ||
467 | ||
c5fcb476 PH |
468 | /* Bit map vector of which controls are not allowed at certain times. For |
469 | each control, there's a bitmap of dis-allowed times. For some, it is easier to | |
470 | specify the negation of a small number of allowed times. */ | |
471 | ||
472 | static unsigned int control_forbids[] = { | |
c46782ef PH |
473 | (unsigned int) |
474 | ~((1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)), /* allow_auth_unadvertised */ | |
475 | ||
476 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
8523533c | 477 | 0, /* bmi_run */ |
c46782ef PH |
478 | #endif |
479 | ||
480 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
e715ad22 | 481 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), /* dk_verify */ |
c46782ef | 482 | #endif |
3e11c26b | 483 | |
c5fcb476 | 484 | 0, /* error */ |
8e669ac1 PH |
485 | |
486 | (unsigned int) | |
c5fcb476 | 487 | ~(1<<ACL_WHERE_RCPT), /* caseful_local_part */ |
8e669ac1 PH |
488 | |
489 | (unsigned int) | |
c5fcb476 | 490 | ~(1<<ACL_WHERE_RCPT), /* caselower_local_part */ |
8e669ac1 | 491 | |
c5fcb476 | 492 | (1<<ACL_WHERE_NOTSMTP), /* enforce_sync */ |
8e669ac1 | 493 | |
c5fcb476 | 494 | (1<<ACL_WHERE_NOTSMTP), /* no_enforce_sync */ |
8e669ac1 PH |
495 | |
496 | (unsigned int) | |
c5fcb476 PH |
497 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* freeze */ |
498 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
e715ad22 | 499 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
500 | |
501 | (unsigned int) | |
c5fcb476 PH |
502 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* queue_only */ |
503 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
e715ad22 | 504 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
505 | |
506 | (unsigned int) | |
c5fcb476 | 507 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* submission */ |
8e669ac1 | 508 | (1<<ACL_WHERE_PREDATA)), |
8523533c | 509 | |
8800895a PH |
510 | (unsigned int) |
511 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* suppress_local_fixups */ | |
512 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_PREDATA)), | |
513 | ||
c46782ef | 514 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 515 | (unsigned int) |
14d57970 | 516 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* no_mbox_unspool */ |
e715ad22 TK |
517 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
518 | (1<<ACL_WHERE_MIME)), | |
c46782ef | 519 | #endif |
a6c4ab60 | 520 | |
29aba418 TF |
521 | (unsigned int) |
522 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakedefer */ | |
523 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
524 | (1<<ACL_WHERE_MIME)), | |
525 | ||
8e669ac1 | 526 | (unsigned int) |
a6c4ab60 | 527 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakereject */ |
e715ad22 TK |
528 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
529 | (1<<ACL_WHERE_MIME)), | |
8523533c | 530 | |
c5fcb476 PH |
531 | (1<<ACL_WHERE_NOTSMTP) /* no_multiline */ |
532 | }; | |
533 | ||
534 | /* Structure listing various control arguments, with their characteristics. */ | |
059ec3d9 PH |
535 | |
536 | typedef struct control_def { | |
537 | uschar *name; | |
538 | int value; /* CONTROL_xxx value */ | |
059ec3d9 PH |
539 | BOOL has_option; /* Has /option(s) following */ |
540 | } control_def; | |
541 | ||
542 | static control_def controls_list[] = { | |
c46782ef | 543 | { US"allow_auth_unadvertised", CONTROL_AUTH_UNADVERTISED, FALSE }, |
8523533c | 544 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
c46782ef | 545 | { US"bmi_run", CONTROL_BMI_RUN, FALSE }, |
fb2274d4 TK |
546 | #endif |
547 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
c46782ef | 548 | { US"dk_verify", CONTROL_DK_VERIFY, FALSE }, |
8523533c | 549 | #endif |
c46782ef PH |
550 | { US"caseful_local_part", CONTROL_CASEFUL_LOCAL_PART, FALSE }, |
551 | { US"caselower_local_part", CONTROL_CASELOWER_LOCAL_PART, FALSE }, | |
552 | { US"enforce_sync", CONTROL_ENFORCE_SYNC, FALSE }, | |
553 | { US"freeze", CONTROL_FREEZE, TRUE }, | |
554 | { US"no_enforce_sync", CONTROL_NO_ENFORCE_SYNC, FALSE }, | |
555 | { US"no_multiline_responses", CONTROL_NO_MULTILINE, FALSE }, | |
556 | { US"queue_only", CONTROL_QUEUE_ONLY, FALSE }, | |
8523533c | 557 | #ifdef WITH_CONTENT_SCAN |
c46782ef | 558 | { US"no_mbox_unspool", CONTROL_NO_MBOX_UNSPOOL, FALSE }, |
8523533c | 559 | #endif |
c46782ef PH |
560 | { US"fakedefer", CONTROL_FAKEDEFER, TRUE }, |
561 | { US"fakereject", CONTROL_FAKEREJECT, TRUE }, | |
562 | { US"submission", CONTROL_SUBMISSION, TRUE }, | |
563 | { US"suppress_local_fixups", CONTROL_SUPPRESS_LOCAL_FIXUPS, FALSE } | |
059ec3d9 PH |
564 | }; |
565 | ||
e5a9dba6 PH |
566 | /* Support data structures for Client SMTP Authorization. acl_verify_csa() |
567 | caches its result in a tree to avoid repeated DNS queries. The result is an | |
568 | integer code which is used as an index into the following tables of | |
569 | explanatory strings and verification return codes. */ | |
570 | ||
571 | static tree_node *csa_cache = NULL; | |
572 | ||
573 | enum { CSA_UNKNOWN, CSA_OK, CSA_DEFER_SRV, CSA_DEFER_ADDR, | |
574 | CSA_FAIL_EXPLICIT, CSA_FAIL_DOMAIN, CSA_FAIL_NOADDR, CSA_FAIL_MISMATCH }; | |
575 | ||
576 | /* The acl_verify_csa() return code is translated into an acl_verify() return | |
577 | code using the following table. It is OK unless the client is definitely not | |
578 | authorized. This is because CSA is supposed to be optional for sending sites, | |
579 | so recipients should not be too strict about checking it - especially because | |
580 | DNS problems are quite likely to occur. It's possible to use $csa_status in | |
581 | further ACL conditions to distinguish ok, unknown, and defer if required, but | |
582 | the aim is to make the usual configuration simple. */ | |
583 | ||
584 | static int csa_return_code[] = { | |
585 | OK, OK, OK, OK, | |
586 | FAIL, FAIL, FAIL, FAIL | |
587 | }; | |
588 | ||
589 | static uschar *csa_status_string[] = { | |
590 | US"unknown", US"ok", US"defer", US"defer", | |
591 | US"fail", US"fail", US"fail", US"fail" | |
592 | }; | |
593 | ||
594 | static uschar *csa_reason_string[] = { | |
595 | US"unknown", | |
596 | US"ok", | |
597 | US"deferred (SRV lookup failed)", | |
598 | US"deferred (target address lookup failed)", | |
599 | US"failed (explicit authorization required)", | |
600 | US"failed (host name not authorized)", | |
601 | US"failed (no authorized addresses)", | |
602 | US"failed (client address mismatch)" | |
603 | }; | |
604 | ||
059ec3d9 PH |
605 | /* Enable recursion between acl_check_internal() and acl_check_condition() */ |
606 | ||
607 | static int acl_check_internal(int, address_item *, uschar *, int, uschar **, | |
608 | uschar **); | |
609 | ||
610 | ||
611 | /************************************************* | |
612 | * Pick out name from list * | |
613 | *************************************************/ | |
614 | ||
615 | /* Use a binary chop method | |
616 | ||
617 | Arguments: | |
618 | name name to find | |
619 | list list of names | |
620 | end size of list | |
621 | ||
622 | Returns: offset in list, or -1 if not found | |
623 | */ | |
624 | ||
625 | static int | |
626 | acl_checkname(uschar *name, uschar **list, int end) | |
627 | { | |
628 | int start = 0; | |
629 | ||
630 | while (start < end) | |
631 | { | |
632 | int mid = (start + end)/2; | |
633 | int c = Ustrcmp(name, list[mid]); | |
634 | if (c == 0) return mid; | |
635 | if (c < 0) end = mid; else start = mid + 1; | |
636 | } | |
637 | ||
638 | return -1; | |
639 | } | |
640 | ||
641 | ||
642 | /************************************************* | |
643 | * Read and parse one ACL * | |
644 | *************************************************/ | |
645 | ||
646 | /* This function is called both from readconf in order to parse the ACLs in the | |
647 | configuration file, and also when an ACL is encountered dynamically (e.g. as | |
648 | the result of an expansion). It is given a function to call in order to | |
649 | retrieve the lines of the ACL. This function handles skipping comments and | |
650 | blank lines (where relevant). | |
651 | ||
652 | Arguments: | |
653 | func function to get next line of ACL | |
654 | error where to put an error message | |
655 | ||
656 | Returns: pointer to ACL, or NULL | |
657 | NULL can be legal (empty ACL); in this case error will be NULL | |
658 | */ | |
659 | ||
660 | acl_block * | |
661 | acl_read(uschar *(*func)(void), uschar **error) | |
662 | { | |
663 | acl_block *yield = NULL; | |
664 | acl_block **lastp = &yield; | |
665 | acl_block *this = NULL; | |
666 | acl_condition_block *cond; | |
667 | acl_condition_block **condp = NULL; | |
668 | uschar *s; | |
669 | ||
670 | *error = NULL; | |
671 | ||
672 | while ((s = (*func)()) != NULL) | |
673 | { | |
674 | int v, c; | |
675 | BOOL negated = FALSE; | |
676 | uschar *saveline = s; | |
677 | uschar name[64]; | |
678 | ||
679 | /* Conditions (but not verbs) are allowed to be negated by an initial | |
680 | exclamation mark. */ | |
681 | ||
682 | while (isspace(*s)) s++; | |
683 | if (*s == '!') | |
684 | { | |
685 | negated = TRUE; | |
686 | s++; | |
687 | } | |
688 | ||
cf00dad6 PH |
689 | /* Read the name of a verb or a condition, or the start of a new ACL, which |
690 | can be started by a name, or by a macro definition. */ | |
059ec3d9 PH |
691 | |
692 | s = readconf_readname(name, sizeof(name), s); | |
cf00dad6 | 693 | if (*s == ':' || isupper(name[0] && *s == '=')) return yield; |
059ec3d9 PH |
694 | |
695 | /* If a verb is unrecognized, it may be another condition or modifier that | |
696 | continues the previous verb. */ | |
697 | ||
698 | v = acl_checkname(name, verbs, sizeof(verbs)/sizeof(char *)); | |
699 | if (v < 0) | |
700 | { | |
701 | if (this == NULL) | |
702 | { | |
703 | *error = string_sprintf("unknown ACL verb in \"%s\"", saveline); | |
704 | return NULL; | |
705 | } | |
706 | } | |
707 | ||
708 | /* New verb */ | |
709 | ||
710 | else | |
711 | { | |
712 | if (negated) | |
713 | { | |
714 | *error = string_sprintf("malformed ACL line \"%s\"", saveline); | |
715 | return NULL; | |
716 | } | |
717 | this = store_get(sizeof(acl_block)); | |
718 | *lastp = this; | |
719 | lastp = &(this->next); | |
720 | this->next = NULL; | |
721 | this->verb = v; | |
722 | this->condition = NULL; | |
723 | condp = &(this->condition); | |
724 | if (*s == 0) continue; /* No condition on this line */ | |
725 | if (*s == '!') | |
726 | { | |
727 | negated = TRUE; | |
728 | s++; | |
729 | } | |
730 | s = readconf_readname(name, sizeof(name), s); /* Condition name */ | |
731 | } | |
732 | ||
733 | /* Handle a condition or modifier. */ | |
734 | ||
735 | c = acl_checkname(name, conditions, sizeof(conditions)/sizeof(char *)); | |
736 | if (c < 0) | |
737 | { | |
738 | *error = string_sprintf("unknown ACL condition/modifier in \"%s\"", | |
739 | saveline); | |
740 | return NULL; | |
741 | } | |
742 | ||
743 | /* The modifiers may not be negated */ | |
744 | ||
745 | if (negated && cond_modifiers[c]) | |
746 | { | |
747 | *error = string_sprintf("ACL error: negation is not allowed with " | |
748 | "\"%s\"", conditions[c]); | |
749 | return NULL; | |
750 | } | |
751 | ||
752 | /* ENDPASS may occur only with ACCEPT or DISCARD. */ | |
753 | ||
754 | if (c == ACLC_ENDPASS && | |
755 | this->verb != ACL_ACCEPT && | |
756 | this->verb != ACL_DISCARD) | |
757 | { | |
758 | *error = string_sprintf("ACL error: \"%s\" is not allowed with \"%s\"", | |
759 | conditions[c], verbs[this->verb]); | |
760 | return NULL; | |
761 | } | |
762 | ||
763 | cond = store_get(sizeof(acl_condition_block)); | |
764 | cond->next = NULL; | |
765 | cond->type = c; | |
766 | cond->u.negated = negated; | |
767 | ||
768 | *condp = cond; | |
769 | condp = &(cond->next); | |
770 | ||
771 | /* The "set" modifier is different in that its argument is "name=value" | |
772 | rather than just a value, and we can check the validity of the name, which | |
773 | gives us a variable number to insert into the data block. */ | |
774 | ||
775 | if (c == ACLC_SET) | |
776 | { | |
47ca6d6c PH |
777 | int offset, max, n; |
778 | uschar *endptr; | |
779 | ||
780 | if (Ustrncmp(s, "acl_", 4) != 0) goto BAD_ACL_VAR; | |
781 | if (s[4] == 'c') | |
782 | { | |
783 | offset = 0; | |
784 | max = ACL_CVARS; | |
785 | } | |
786 | else if (s[4] == 'm') | |
787 | { | |
788 | offset = ACL_CVARS; | |
789 | max = ACL_MVARS; | |
790 | } | |
791 | else goto BAD_ACL_VAR; | |
792 | ||
793 | n = Ustrtoul(s + 5, &endptr, 10); | |
794 | if ((*endptr != 0 && *endptr != '=' && !isspace(*endptr)) || n >= max) | |
059ec3d9 | 795 | { |
47ca6d6c PH |
796 | BAD_ACL_VAR: |
797 | *error = string_sprintf("syntax error or unrecognized name after " | |
798 | "\"set\" in ACL modifier \"set %s\"", s); | |
059ec3d9 PH |
799 | return NULL; |
800 | } | |
801 | ||
47ca6d6c PH |
802 | cond->u.varnumber = n + offset; |
803 | s = endptr; | |
059ec3d9 PH |
804 | while (isspace(*s)) s++; |
805 | } | |
806 | ||
807 | /* For "set", we are now positioned for the data. For the others, only | |
808 | "endpass" has no data */ | |
809 | ||
810 | if (c != ACLC_ENDPASS) | |
811 | { | |
812 | if (*s++ != '=') | |
813 | { | |
814 | *error = string_sprintf("\"=\" missing after ACL \"%s\" %s", name, | |
815 | cond_modifiers[c]? US"modifier" : US"condition"); | |
816 | return NULL; | |
817 | } | |
818 | while (isspace(*s)) s++; | |
819 | cond->arg = string_copy(s); | |
820 | } | |
821 | } | |
822 | ||
823 | return yield; | |
824 | } | |
825 | ||
826 | ||
827 | ||
828 | /************************************************* | |
829 | * Handle warnings * | |
830 | *************************************************/ | |
831 | ||
832 | /* This function is called when a WARN verb's conditions are true. It adds to | |
833 | the message's headers, and/or writes information to the log. In each case, this | |
834 | only happens once (per message for headers, per connection for log). | |
835 | ||
836 | Arguments: | |
837 | where ACL_WHERE_xxxx indicating which ACL this is | |
838 | user_message message for adding to headers | |
839 | log_message message for logging, if different | |
840 | ||
841 | Returns: nothing | |
842 | */ | |
843 | ||
844 | static void | |
845 | acl_warn(int where, uschar *user_message, uschar *log_message) | |
846 | { | |
847 | int hlen; | |
848 | ||
849 | if (log_message != NULL && log_message != user_message) | |
850 | { | |
851 | uschar *text; | |
852 | string_item *logged; | |
853 | ||
854 | text = string_sprintf("%s Warning: %s", host_and_ident(TRUE), | |
855 | string_printing(log_message)); | |
856 | ||
857 | /* If a sender verification has failed, and the log message is "sender verify | |
858 | failed", add the failure message. */ | |
859 | ||
860 | if (sender_verified_failed != NULL && | |
861 | sender_verified_failed->message != NULL && | |
862 | strcmpic(log_message, US"sender verify failed") == 0) | |
863 | text = string_sprintf("%s: %s", text, sender_verified_failed->message); | |
864 | ||
9c7a242c PH |
865 | /* Search previously logged warnings. They are kept in malloc |
866 | store so they can be freed at the start of a new message. */ | |
059ec3d9 PH |
867 | |
868 | for (logged = acl_warn_logged; logged != NULL; logged = logged->next) | |
869 | if (Ustrcmp(logged->text, text) == 0) break; | |
870 | ||
871 | if (logged == NULL) | |
872 | { | |
873 | int length = Ustrlen(text) + 1; | |
874 | log_write(0, LOG_MAIN, "%s", text); | |
875 | logged = store_malloc(sizeof(string_item) + length); | |
876 | logged->text = (uschar *)logged + sizeof(string_item); | |
877 | memcpy(logged->text, text, length); | |
878 | logged->next = acl_warn_logged; | |
879 | acl_warn_logged = logged; | |
880 | } | |
881 | } | |
882 | ||
883 | /* If there's no user message, we are done. */ | |
884 | ||
885 | if (user_message == NULL) return; | |
886 | ||
887 | /* If this isn't a message ACL, we can't do anything with a user message. | |
888 | Log an error. */ | |
889 | ||
890 | if (where > ACL_WHERE_NOTSMTP) | |
891 | { | |
892 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting " | |
893 | "found in a non-message (%s) ACL: cannot specify header lines here: " | |
894 | "message ignored", acl_wherenames[where]); | |
895 | return; | |
896 | } | |
897 | ||
898 | /* Treat the user message as a sequence of one or more header lines. */ | |
899 | ||
900 | hlen = Ustrlen(user_message); | |
901 | if (hlen > 0) | |
902 | { | |
903 | uschar *text, *p, *q; | |
904 | ||
905 | /* Add a final newline if not present */ | |
906 | ||
907 | text = ((user_message)[hlen-1] == '\n')? user_message : | |
908 | string_sprintf("%s\n", user_message); | |
909 | ||
910 | /* Loop for multiple header lines, taking care about continuations */ | |
911 | ||
912 | for (p = q = text; *p != 0; ) | |
913 | { | |
914 | uschar *s; | |
915 | int newtype = htype_add_bot; | |
916 | header_line **hptr = &acl_warn_headers; | |
917 | ||
918 | /* Find next header line within the string */ | |
919 | ||
920 | for (;;) | |
921 | { | |
922 | q = Ustrchr(q, '\n'); | |
923 | if (*(++q) != ' ' && *q != '\t') break; | |
924 | } | |
925 | ||
926 | /* If the line starts with a colon, interpret the instruction for where to | |
927 | add it. This temporarily sets up a new type. */ | |
928 | ||
929 | if (*p == ':') | |
930 | { | |
931 | if (strncmpic(p, US":after_received:", 16) == 0) | |
932 | { | |
933 | newtype = htype_add_rec; | |
934 | p += 16; | |
935 | } | |
8523533c TK |
936 | else if (strncmpic(p, US":at_start_rfc:", 14) == 0) |
937 | { | |
938 | newtype = htype_add_rfc; | |
939 | p += 14; | |
8e669ac1 | 940 | } |
059ec3d9 PH |
941 | else if (strncmpic(p, US":at_start:", 10) == 0) |
942 | { | |
943 | newtype = htype_add_top; | |
944 | p += 10; | |
945 | } | |
946 | else if (strncmpic(p, US":at_end:", 8) == 0) | |
947 | { | |
948 | newtype = htype_add_bot; | |
949 | p += 8; | |
950 | } | |
951 | while (*p == ' ' || *p == '\t') p++; | |
952 | } | |
953 | ||
954 | /* See if this line starts with a header name, and if not, add X-ACL-Warn: | |
955 | to the front of it. */ | |
956 | ||
957 | for (s = p; s < q - 1; s++) | |
958 | { | |
959 | if (*s == ':' || !isgraph(*s)) break; | |
960 | } | |
961 | ||
962 | s = string_sprintf("%s%.*s", (*s == ':')? "" : "X-ACL-Warn: ", q - p, p); | |
963 | hlen = Ustrlen(s); | |
964 | ||
965 | /* See if this line has already been added */ | |
966 | ||
967 | while (*hptr != NULL) | |
968 | { | |
969 | if (Ustrncmp((*hptr)->text, s, hlen) == 0) break; | |
970 | hptr = &((*hptr)->next); | |
971 | } | |
972 | ||
973 | /* Add if not previously present */ | |
974 | ||
975 | if (*hptr == NULL) | |
976 | { | |
977 | header_line *h = store_get(sizeof(header_line)); | |
978 | h->text = s; | |
979 | h->next = NULL; | |
980 | h->type = newtype; | |
981 | h->slen = hlen; | |
982 | *hptr = h; | |
983 | hptr = &(h->next); | |
984 | } | |
985 | ||
986 | /* Advance for next header line within the string */ | |
987 | ||
988 | p = q; | |
989 | } | |
990 | } | |
991 | } | |
992 | ||
993 | ||
994 | ||
995 | /************************************************* | |
996 | * Verify and check reverse DNS * | |
997 | *************************************************/ | |
998 | ||
999 | /* Called from acl_verify() below. We look up the host name(s) of the client IP | |
1000 | address if this has not yet been done. The host_name_lookup() function checks | |
1001 | that one of these names resolves to an address list that contains the client IP | |
1002 | address, so we don't actually have to do the check here. | |
1003 | ||
1004 | Arguments: | |
1005 | user_msgptr pointer for user message | |
1006 | log_msgptr pointer for log message | |
1007 | ||
1008 | Returns: OK verification condition succeeded | |
1009 | FAIL verification failed | |
1010 | DEFER there was a problem verifying | |
1011 | */ | |
1012 | ||
1013 | static int | |
1014 | acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr) | |
1015 | { | |
1016 | int rc; | |
1017 | ||
1018 | user_msgptr = user_msgptr; /* stop compiler warning */ | |
1019 | ||
1020 | /* Previous success */ | |
1021 | ||
1022 | if (sender_host_name != NULL) return OK; | |
1023 | ||
1024 | /* Previous failure */ | |
1025 | ||
1026 | if (host_lookup_failed) | |
1027 | { | |
1028 | *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg); | |
1029 | return FAIL; | |
1030 | } | |
1031 | ||
1032 | /* Need to do a lookup */ | |
1033 | ||
1034 | HDEBUG(D_acl) | |
1035 | debug_printf("looking up host name to force name/address consistency check\n"); | |
1036 | ||
1037 | if ((rc = host_name_lookup()) != OK) | |
1038 | { | |
1039 | *log_msgptr = (rc == DEFER)? | |
1040 | US"host lookup deferred for reverse lookup check" | |
1041 | : | |
1042 | string_sprintf("host lookup failed for reverse lookup check%s", | |
1043 | host_lookup_msg); | |
1044 | return rc; /* DEFER or FAIL */ | |
1045 | } | |
1046 | ||
1047 | host_build_sender_fullhost(); | |
1048 | return OK; | |
1049 | } | |
1050 | ||
1051 | ||
1052 | ||
e5a9dba6 PH |
1053 | /************************************************* |
1054 | * Check client IP address matches CSA target * | |
1055 | *************************************************/ | |
1056 | ||
1057 | /* Called from acl_verify_csa() below. This routine scans a section of a DNS | |
1058 | response for address records belonging to the CSA target hostname. The section | |
1059 | is specified by the reset argument, either RESET_ADDITIONAL or RESET_ANSWERS. | |
1060 | If one of the addresses matches the client's IP address, then the client is | |
1061 | authorized by CSA. If there are target IP addresses but none of them match | |
1062 | then the client is using an unauthorized IP address. If there are no target IP | |
1063 | addresses then the client cannot be using an authorized IP address. (This is | |
1064 | an odd configuration - why didn't the SRV record have a weight of 1 instead?) | |
1065 | ||
1066 | Arguments: | |
1067 | dnsa the DNS answer block | |
1068 | dnss a DNS scan block for us to use | |
1069 | reset option specifing what portion to scan, as described above | |
1070 | target the target hostname to use for matching RR names | |
1071 | ||
1072 | Returns: CSA_OK successfully authorized | |
1073 | CSA_FAIL_MISMATCH addresses found but none matched | |
1074 | CSA_FAIL_NOADDR no target addresses found | |
1075 | */ | |
1076 | ||
1077 | static int | |
1078 | acl_verify_csa_address(dns_answer *dnsa, dns_scan *dnss, int reset, | |
1079 | uschar *target) | |
1080 | { | |
1081 | dns_record *rr; | |
1082 | dns_address *da; | |
1083 | ||
1084 | BOOL target_found = FALSE; | |
1085 | ||
1086 | for (rr = dns_next_rr(dnsa, dnss, reset); | |
1087 | rr != NULL; | |
1088 | rr = dns_next_rr(dnsa, dnss, RESET_NEXT)) | |
1089 | { | |
1090 | /* Check this is an address RR for the target hostname. */ | |
1091 | ||
1092 | if (rr->type != T_A | |
1093 | #if HAVE_IPV6 | |
1094 | && rr->type != T_AAAA | |
1095 | #ifdef SUPPORT_A6 | |
1096 | && rr->type != T_A6 | |
1097 | #endif | |
1098 | #endif | |
1099 | ) continue; | |
1100 | ||
1101 | if (strcmpic(target, rr->name) != 0) continue; | |
1102 | ||
1103 | target_found = TRUE; | |
1104 | ||
1105 | /* Turn the target address RR into a list of textual IP addresses and scan | |
1106 | the list. There may be more than one if it is an A6 RR. */ | |
1107 | ||
1108 | for (da = dns_address_from_rr(dnsa, rr); da != NULL; da = da->next) | |
1109 | { | |
1110 | /* If the client IP address matches the target IP address, it's good! */ | |
1111 | ||
1112 | DEBUG(D_acl) debug_printf("CSA target address is %s\n", da->address); | |
1113 | ||
1114 | if (strcmpic(sender_host_address, da->address) == 0) return CSA_OK; | |
1115 | } | |
1116 | } | |
1117 | ||
1118 | /* If we found some target addresses but none of them matched, the client is | |
1119 | using an unauthorized IP address, otherwise the target has no authorized IP | |
1120 | addresses. */ | |
1121 | ||
1122 | if (target_found) return CSA_FAIL_MISMATCH; | |
1123 | else return CSA_FAIL_NOADDR; | |
1124 | } | |
1125 | ||
1126 | ||
1127 | ||
1128 | /************************************************* | |
1129 | * Verify Client SMTP Authorization * | |
1130 | *************************************************/ | |
1131 | ||
1132 | /* Called from acl_verify() below. This routine calls dns_lookup_special() | |
1133 | to find the CSA SRV record corresponding to the domain argument, or | |
1134 | $sender_helo_name if no argument is provided. It then checks that the | |
1135 | client is authorized, and that its IP address corresponds to the SRV | |
1136 | target's address by calling acl_verify_csa_address() above. The address | |
1137 | should have been returned in the DNS response's ADDITIONAL section, but if | |
1138 | not we perform another DNS lookup to get it. | |
1139 | ||
1140 | Arguments: | |
1141 | domain pointer to optional parameter following verify = csa | |
1142 | ||
1143 | Returns: CSA_UNKNOWN no valid CSA record found | |
1144 | CSA_OK successfully authorized | |
1145 | CSA_FAIL_* client is definitely not authorized | |
1146 | CSA_DEFER_* there was a DNS problem | |
1147 | */ | |
1148 | ||
1149 | static int | |
1150 | acl_verify_csa(uschar *domain) | |
1151 | { | |
1152 | tree_node *t; | |
1153 | uschar *found, *p; | |
1154 | int priority, weight, port; | |
1155 | dns_answer dnsa; | |
1156 | dns_scan dnss; | |
1157 | dns_record *rr; | |
1158 | int rc, type; | |
1159 | uschar target[256]; | |
1160 | ||
1161 | /* Work out the domain we are using for the CSA lookup. The default is the | |
1162 | client's HELO domain. If the client has not said HELO, use its IP address | |
1163 | instead. If it's a local client (exim -bs), CSA isn't applicable. */ | |
1164 | ||
1165 | while (isspace(*domain) && *domain != '\0') ++domain; | |
1166 | if (*domain == '\0') domain = sender_helo_name; | |
1167 | if (domain == NULL) domain = sender_host_address; | |
1168 | if (sender_host_address == NULL) return CSA_UNKNOWN; | |
1169 | ||
1170 | /* If we have an address literal, strip off the framing ready for turning it | |
1171 | into a domain. The framing consists of matched square brackets possibly | |
1172 | containing a keyword and a colon before the actual IP address. */ | |
1173 | ||
1174 | if (domain[0] == '[') | |
1175 | { | |
1176 | uschar *start = Ustrchr(domain, ':'); | |
1177 | if (start == NULL) start = domain; | |
1178 | domain = string_copyn(start + 1, Ustrlen(start) - 2); | |
1179 | } | |
1180 | ||
1181 | /* Turn domains that look like bare IP addresses into domains in the reverse | |
1182 | DNS. This code also deals with address literals and $sender_host_address. It's | |
1183 | not quite kosher to treat bare domains such as EHLO 192.0.2.57 the same as | |
1184 | address literals, but it's probably the most friendly thing to do. This is an | |
1185 | extension to CSA, so we allow it to be turned off for proper conformance. */ | |
1186 | ||
7e66e54d | 1187 | if (string_is_ip_address(domain, NULL) != 0) |
e5a9dba6 PH |
1188 | { |
1189 | if (!dns_csa_use_reverse) return CSA_UNKNOWN; | |
1190 | dns_build_reverse(domain, target); | |
1191 | domain = target; | |
1192 | } | |
1193 | ||
1194 | /* Find out if we've already done the CSA check for this domain. If we have, | |
1195 | return the same result again. Otherwise build a new cached result structure | |
1196 | for this domain. The name is filled in now, and the value is filled in when | |
1197 | we return from this function. */ | |
1198 | ||
1199 | t = tree_search(csa_cache, domain); | |
1200 | if (t != NULL) return t->data.val; | |
1201 | ||
1202 | t = store_get_perm(sizeof(tree_node) + Ustrlen(domain)); | |
1203 | Ustrcpy(t->name, domain); | |
1204 | (void)tree_insertnode(&csa_cache, t); | |
1205 | ||
1206 | /* Now we are ready to do the actual DNS lookup(s). */ | |
1207 | ||
28e6ef29 | 1208 | found = domain; |
e5a9dba6 PH |
1209 | switch (dns_special_lookup(&dnsa, domain, T_CSA, &found)) |
1210 | { | |
1211 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1212 | ||
1213 | default: | |
1214 | return t->data.val = CSA_DEFER_SRV; | |
1215 | ||
1216 | /* If we found nothing, the client's authorization is unknown. */ | |
1217 | ||
1218 | case DNS_NOMATCH: | |
1219 | case DNS_NODATA: | |
1220 | return t->data.val = CSA_UNKNOWN; | |
1221 | ||
1222 | /* We got something! Go on to look at the reply in more detail. */ | |
1223 | ||
1224 | case DNS_SUCCEED: | |
1225 | break; | |
1226 | } | |
1227 | ||
1228 | /* Scan the reply for well-formed CSA SRV records. */ | |
1229 | ||
1230 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
1231 | rr != NULL; | |
1232 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
1233 | { | |
1234 | if (rr->type != T_SRV) continue; | |
1235 | ||
1236 | /* Extract the numerical SRV fields (p is incremented) */ | |
1237 | ||
1238 | p = rr->data; | |
1239 | GETSHORT(priority, p); | |
1240 | GETSHORT(weight, p); | |
1241 | GETSHORT(port, p); | |
1242 | ||
1243 | DEBUG(D_acl) | |
1244 | debug_printf("CSA priority=%d weight=%d port=%d\n", priority, weight, port); | |
1245 | ||
1246 | /* Check the CSA version number */ | |
1247 | ||
1248 | if (priority != 1) continue; | |
1249 | ||
1250 | /* If the domain does not have a CSA SRV record of its own (i.e. the domain | |
1251 | found by dns_special_lookup() is a parent of the one we asked for), we check | |
1252 | the subdomain assertions in the port field. At the moment there's only one | |
1253 | assertion: legitimate SMTP clients are all explicitly authorized with CSA | |
1254 | SRV records of their own. */ | |
1255 | ||
1256 | if (found != domain) | |
1257 | { | |
1258 | if (port & 1) | |
1259 | return t->data.val = CSA_FAIL_EXPLICIT; | |
1260 | else | |
1261 | return t->data.val = CSA_UNKNOWN; | |
1262 | } | |
1263 | ||
1264 | /* This CSA SRV record refers directly to our domain, so we check the value | |
1265 | in the weight field to work out the domain's authorization. 0 and 1 are | |
1266 | unauthorized; 3 means the client is authorized but we can't check the IP | |
1267 | address in order to authenticate it, so we treat it as unknown; values | |
1268 | greater than 3 are undefined. */ | |
1269 | ||
1270 | if (weight < 2) return t->data.val = CSA_FAIL_DOMAIN; | |
1271 | ||
1272 | if (weight > 2) continue; | |
1273 | ||
1274 | /* Weight == 2, which means the domain is authorized. We must check that the | |
1275 | client's IP address is listed as one of the SRV target addresses. Save the | |
1276 | target hostname then break to scan the additional data for its addresses. */ | |
1277 | ||
1278 | (void)dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, | |
1279 | (DN_EXPAND_ARG4_TYPE)target, sizeof(target)); | |
1280 | ||
1281 | DEBUG(D_acl) debug_printf("CSA target is %s\n", target); | |
1282 | ||
1283 | break; | |
1284 | } | |
1285 | ||
1286 | /* If we didn't break the loop then no appropriate records were found. */ | |
1287 | ||
1288 | if (rr == NULL) return t->data.val = CSA_UNKNOWN; | |
1289 | ||
1290 | /* Do not check addresses if the target is ".", in accordance with RFC 2782. | |
1291 | A target of "." indicates there are no valid addresses, so the client cannot | |
1292 | be authorized. (This is an odd configuration because weight=2 target=. is | |
1293 | equivalent to weight=1, but we check for it in order to keep load off the | |
1294 | root name servers.) Note that dn_expand() turns "." into "". */ | |
1295 | ||
1296 | if (Ustrcmp(target, "") == 0) return t->data.val = CSA_FAIL_NOADDR; | |
1297 | ||
1298 | /* Scan the additional section of the CSA SRV reply for addresses belonging | |
1299 | to the target. If the name server didn't return any additional data (e.g. | |
1300 | because it does not fully support SRV records), we need to do another lookup | |
1301 | to obtain the target addresses; otherwise we have a definitive result. */ | |
1302 | ||
1303 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ADDITIONAL, target); | |
1304 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1305 | ||
1306 | /* The DNS lookup type corresponds to the IP version used by the client. */ | |
1307 | ||
1308 | #if HAVE_IPV6 | |
1309 | if (Ustrchr(sender_host_address, ':') != NULL) | |
1310 | type = T_AAAA; | |
1311 | else | |
1312 | #endif /* HAVE_IPV6 */ | |
1313 | type = T_A; | |
1314 | ||
1315 | ||
1316 | #if HAVE_IPV6 && defined(SUPPORT_A6) | |
1317 | DNS_LOOKUP_AGAIN: | |
1318 | #endif | |
1319 | ||
1320 | switch (dns_lookup(&dnsa, target, type, NULL)) | |
1321 | { | |
1322 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1323 | ||
1324 | default: | |
1325 | return t->data.val = CSA_DEFER_ADDR; | |
1326 | ||
1327 | /* If the query succeeded, scan the addresses and return the result. */ | |
1328 | ||
1329 | case DNS_SUCCEED: | |
1330 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ANSWERS, target); | |
1331 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1332 | /* else fall through */ | |
1333 | ||
1334 | /* If the target has no IP addresses, the client cannot have an authorized | |
1335 | IP address. However, if the target site uses A6 records (not AAAA records) | |
1336 | we have to do yet another lookup in order to check them. */ | |
1337 | ||
1338 | case DNS_NOMATCH: | |
1339 | case DNS_NODATA: | |
1340 | ||
1341 | #if HAVE_IPV6 && defined(SUPPORT_A6) | |
1342 | if (type == T_AAAA) { type = T_A6; goto DNS_LOOKUP_AGAIN; } | |
1343 | #endif | |
1344 | ||
1345 | return t->data.val = CSA_FAIL_NOADDR; | |
1346 | } | |
1347 | } | |
1348 | ||
1349 | ||
1350 | ||
059ec3d9 PH |
1351 | /************************************************* |
1352 | * Handle verification (address & other) * | |
1353 | *************************************************/ | |
1354 | ||
1355 | /* This function implements the "verify" condition. It is called when | |
1356 | encountered in any ACL, because some tests are almost always permitted. Some | |
1357 | just don't make sense, and always fail (for example, an attempt to test a host | |
1358 | lookup for a non-TCP/IP message). Others are restricted to certain ACLs. | |
1359 | ||
1360 | Arguments: | |
1361 | where where called from | |
1362 | addr the recipient address that the ACL is handling, or NULL | |
1363 | arg the argument of "verify" | |
1364 | user_msgptr pointer for user message | |
1365 | log_msgptr pointer for log message | |
1366 | basic_errno where to put verify errno | |
1367 | ||
1368 | Returns: OK verification condition succeeded | |
1369 | FAIL verification failed | |
1370 | DEFER there was a problem verifying | |
1371 | ERROR syntax error | |
1372 | */ | |
1373 | ||
1374 | static int | |
1375 | acl_verify(int where, address_item *addr, uschar *arg, | |
1376 | uschar **user_msgptr, uschar **log_msgptr, int *basic_errno) | |
1377 | { | |
1378 | int sep = '/'; | |
1379 | int callout = -1; | |
1380 | int callout_overall = -1; | |
4deaf07d | 1381 | int callout_connect = -1; |
059ec3d9 PH |
1382 | int verify_options = 0; |
1383 | int rc; | |
1384 | BOOL verify_header_sender = FALSE; | |
1385 | BOOL defer_ok = FALSE; | |
1386 | BOOL callout_defer_ok = FALSE; | |
1387 | BOOL no_details = FALSE; | |
eafd343b | 1388 | BOOL success_on_redirect = FALSE; |
059ec3d9 PH |
1389 | address_item *sender_vaddr = NULL; |
1390 | uschar *verify_sender_address = NULL; | |
1391 | uschar *pm_mailfrom = NULL; | |
1392 | uschar *se_mailfrom = NULL; | |
596875b3 PH |
1393 | |
1394 | /* Some of the verify items have slash-separated options; some do not. Diagnose | |
1395 | an error if options are given for items that don't expect them. This code has | |
1396 | now got very message. Refactoring to use a table would be a good idea one day. | |
1397 | */ | |
1398 | ||
1399 | uschar *slash = Ustrchr(arg, '/'); | |
059ec3d9 PH |
1400 | uschar *list = arg; |
1401 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
1402 | ||
1403 | if (ss == NULL) goto BAD_VERIFY; | |
1404 | ||
1405 | /* Handle name/address consistency verification in a separate function. */ | |
1406 | ||
1407 | if (strcmpic(ss, US"reverse_host_lookup") == 0) | |
1408 | { | |
596875b3 | 1409 | if (slash != NULL) goto NO_OPTIONS; |
059ec3d9 PH |
1410 | if (sender_host_address == NULL) return OK; |
1411 | return acl_verify_reverse(user_msgptr, log_msgptr); | |
1412 | } | |
1413 | ||
1414 | /* TLS certificate verification is done at STARTTLS time; here we just | |
1415 | test whether it was successful or not. (This is for optional verification; for | |
1416 | mandatory verification, the connection doesn't last this long.) */ | |
1417 | ||
1418 | if (strcmpic(ss, US"certificate") == 0) | |
1419 | { | |
596875b3 | 1420 | if (slash != NULL) goto NO_OPTIONS; |
059ec3d9 PH |
1421 | if (tls_certificate_verified) return OK; |
1422 | *user_msgptr = US"no verified certificate"; | |
1423 | return FAIL; | |
1424 | } | |
1425 | ||
d7b47fd0 PH |
1426 | /* We can test the result of optional HELO verification that might have |
1427 | occurred earlier. If not, we can attempt the verification now. */ | |
059ec3d9 | 1428 | |
596875b3 PH |
1429 | if (strcmpic(ss, US"helo") == 0) |
1430 | { | |
1431 | if (slash != NULL) goto NO_OPTIONS; | |
0154e85a TF |
1432 | if (!helo_verified && !helo_verify_failed) smtp_verify_helo(); |
1433 | return helo_verified? OK : FAIL; | |
596875b3 | 1434 | } |
059ec3d9 | 1435 | |
e5a9dba6 PH |
1436 | /* Do Client SMTP Authorization checks in a separate function, and turn the |
1437 | result code into user-friendly strings. */ | |
1438 | ||
1439 | if (strcmpic(ss, US"csa") == 0) | |
1440 | { | |
1441 | rc = acl_verify_csa(list); | |
1442 | *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s", | |
1443 | csa_reason_string[rc]); | |
1444 | csa_status = csa_status_string[rc]; | |
1445 | DEBUG(D_acl) debug_printf("CSA result %s\n", csa_status); | |
1446 | return csa_return_code[rc]; | |
1447 | } | |
1448 | ||
596875b3 PH |
1449 | /* Check that all relevant header lines have the correct syntax. If there is |
1450 | a syntax error, we return details of the error to the sender if configured to | |
1451 | send out full details. (But a "message" setting on the ACL can override, as | |
1452 | always). */ | |
059ec3d9 | 1453 | |
596875b3 | 1454 | if (strcmpic(ss, US"header_syntax") == 0) |
059ec3d9 | 1455 | { |
596875b3 | 1456 | if (slash != NULL) goto NO_OPTIONS; |
1c41c9cc | 1457 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; |
596875b3 PH |
1458 | rc = verify_check_headers(log_msgptr); |
1459 | if (rc != OK && smtp_return_error_details && *log_msgptr != NULL) | |
1460 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1461 | return rc; | |
1462 | } | |
059ec3d9 | 1463 | |
1c41c9cc PH |
1464 | /* Check that no recipient of this message is "blind", that is, every envelope |
1465 | recipient must be mentioned in either To: or Cc:. */ | |
1466 | ||
1467 | if (strcmpic(ss, US"not_blind") == 0) | |
1468 | { | |
1469 | if (slash != NULL) goto NO_OPTIONS; | |
1470 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; | |
1471 | rc = verify_check_notblind(); | |
1472 | if (rc != OK) | |
1473 | { | |
1474 | *log_msgptr = string_sprintf("bcc recipient detected"); | |
1475 | if (smtp_return_error_details) | |
1476 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1477 | } | |
1478 | return rc; | |
1479 | } | |
059ec3d9 | 1480 | |
596875b3 PH |
1481 | /* The remaining verification tests check recipient and sender addresses, |
1482 | either from the envelope or from the header. There are a number of | |
1483 | slash-separated options that are common to all of them. */ | |
059ec3d9 | 1484 | |
059ec3d9 | 1485 | |
596875b3 PH |
1486 | /* Check that there is at least one verifiable sender address in the relevant |
1487 | header lines. This can be followed by callout and defer options, just like | |
1488 | sender and recipient. */ | |
059ec3d9 | 1489 | |
596875b3 PH |
1490 | if (strcmpic(ss, US"header_sender") == 0) |
1491 | { | |
1c41c9cc | 1492 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; |
596875b3 | 1493 | verify_header_sender = TRUE; |
059ec3d9 PH |
1494 | } |
1495 | ||
1496 | /* Otherwise, first item in verify argument must be "sender" or "recipient". | |
1497 | In the case of a sender, this can optionally be followed by an address to use | |
1498 | in place of the actual sender (rare special-case requirement). */ | |
1499 | ||
1500 | else if (strncmpic(ss, US"sender", 6) == 0) | |
1501 | { | |
1502 | uschar *s = ss + 6; | |
1503 | if (where > ACL_WHERE_NOTSMTP) | |
1504 | { | |
1505 | *log_msgptr = string_sprintf("cannot verify sender in ACL for %s " | |
1506 | "(only possible for MAIL, RCPT, PREDATA, or DATA)", | |
1507 | acl_wherenames[where]); | |
1508 | return ERROR; | |
1509 | } | |
1510 | if (*s == 0) | |
1511 | verify_sender_address = sender_address; | |
1512 | else | |
1513 | { | |
1514 | while (isspace(*s)) s++; | |
1515 | if (*s++ != '=') goto BAD_VERIFY; | |
1516 | while (isspace(*s)) s++; | |
1517 | verify_sender_address = string_copy(s); | |
1518 | } | |
1519 | } | |
1520 | else | |
1521 | { | |
1522 | if (strcmpic(ss, US"recipient") != 0) goto BAD_VERIFY; | |
1523 | if (addr == NULL) | |
1524 | { | |
1525 | *log_msgptr = string_sprintf("cannot verify recipient in ACL for %s " | |
1526 | "(only possible for RCPT)", acl_wherenames[where]); | |
1527 | return ERROR; | |
1528 | } | |
1529 | } | |
1530 | ||
596875b3 PH |
1531 | /* Remaining items are optional; they apply to sender and recipient |
1532 | verification, including "header sender" verification. */ | |
059ec3d9 PH |
1533 | |
1534 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) | |
1535 | != NULL) | |
1536 | { | |
1537 | if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE; | |
1538 | else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE; | |
eafd343b | 1539 | else if (strcmpic(ss, US"success_on_redirect") == 0) success_on_redirect = TRUE; |
059ec3d9 PH |
1540 | |
1541 | /* These two old options are left for backwards compatibility */ | |
1542 | ||
1543 | else if (strcmpic(ss, US"callout_defer_ok") == 0) | |
1544 | { | |
1545 | callout_defer_ok = TRUE; | |
1546 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1547 | } | |
1548 | ||
1549 | else if (strcmpic(ss, US"check_postmaster") == 0) | |
1550 | { | |
1551 | pm_mailfrom = US""; | |
1552 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1553 | } | |
1554 | ||
1555 | /* The callout option has a number of sub-options, comma separated */ | |
1556 | ||
1557 | else if (strncmpic(ss, US"callout", 7) == 0) | |
1558 | { | |
1559 | callout = CALLOUT_TIMEOUT_DEFAULT; | |
1560 | ss += 7; | |
1561 | if (*ss != 0) | |
1562 | { | |
1563 | while (isspace(*ss)) ss++; | |
1564 | if (*ss++ == '=') | |
1565 | { | |
1566 | int optsep = ','; | |
1567 | uschar *opt; | |
1568 | uschar buffer[256]; | |
1569 | while (isspace(*ss)) ss++; | |
8e669ac1 PH |
1570 | |
1571 | /* This callout option handling code has become a mess as new options | |
1572 | have been added in an ad hoc manner. It should be tidied up into some | |
4deaf07d | 1573 | kind of table-driven thing. */ |
8e669ac1 | 1574 | |
059ec3d9 PH |
1575 | while ((opt = string_nextinlist(&ss, &optsep, buffer, sizeof(buffer))) |
1576 | != NULL) | |
1577 | { | |
1578 | if (strcmpic(opt, US"defer_ok") == 0) callout_defer_ok = TRUE; | |
1579 | else if (strcmpic(opt, US"no_cache") == 0) | |
1580 | verify_options |= vopt_callout_no_cache; | |
1581 | else if (strcmpic(opt, US"random") == 0) | |
1582 | verify_options |= vopt_callout_random; | |
1583 | else if (strcmpic(opt, US"use_sender") == 0) | |
1584 | verify_options |= vopt_callout_recipsender; | |
1585 | else if (strcmpic(opt, US"use_postmaster") == 0) | |
1586 | verify_options |= vopt_callout_recippmaster; | |
1587 | else if (strcmpic(opt, US"postmaster") == 0) pm_mailfrom = US""; | |
2a4be8f9 PH |
1588 | else if (strcmpic(opt, US"fullpostmaster") == 0) |
1589 | { | |
1590 | pm_mailfrom = US""; | |
1591 | verify_options |= vopt_callout_fullpm; | |
1592 | } | |
059ec3d9 PH |
1593 | |
1594 | else if (strncmpic(opt, US"mailfrom", 8) == 0) | |
1595 | { | |
1596 | if (!verify_header_sender) | |
1597 | { | |
1598 | *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a " | |
1599 | "callout option only for verify=header_sender (detected in ACL " | |
1600 | "condition \"%s\")", arg); | |
1601 | return ERROR; | |
1602 | } | |
1603 | opt += 8; | |
1604 | while (isspace(*opt)) opt++; | |
1605 | if (*opt++ != '=') | |
1606 | { | |
1607 | *log_msgptr = string_sprintf("'=' expected after " | |
1608 | "\"mailfrom\" in ACL condition \"%s\"", arg); | |
1609 | return ERROR; | |
1610 | } | |
1611 | while (isspace(*opt)) opt++; | |
1612 | se_mailfrom = string_copy(opt); | |
1613 | } | |
1614 | ||
1615 | else if (strncmpic(opt, US"postmaster_mailfrom", 19) == 0) | |
1616 | { | |
1617 | opt += 19; | |
1618 | while (isspace(*opt)) opt++; | |
1619 | if (*opt++ != '=') | |
1620 | { | |
1621 | *log_msgptr = string_sprintf("'=' expected after " | |
1622 | "\"postmaster_mailfrom\" in ACL condition \"%s\"", arg); | |
1623 | return ERROR; | |
1624 | } | |
1625 | while (isspace(*opt)) opt++; | |
1626 | pm_mailfrom = string_copy(opt); | |
1627 | } | |
1628 | ||
1629 | else if (strncmpic(opt, US"maxwait", 7) == 0) | |
1630 | { | |
1631 | opt += 7; | |
1632 | while (isspace(*opt)) opt++; | |
1633 | if (*opt++ != '=') | |
1634 | { | |
1635 | *log_msgptr = string_sprintf("'=' expected after \"maxwait\" in " | |
1636 | "ACL condition \"%s\"", arg); | |
1637 | return ERROR; | |
1638 | } | |
1639 | while (isspace(*opt)) opt++; | |
1640 | callout_overall = readconf_readtime(opt, 0, FALSE); | |
1641 | if (callout_overall < 0) | |
1642 | { | |
1643 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1644 | "\"verify %s\"", arg); | |
1645 | return ERROR; | |
1646 | } | |
1647 | } | |
4deaf07d PH |
1648 | else if (strncmpic(opt, US"connect", 7) == 0) |
1649 | { | |
1650 | opt += 7; | |
1651 | while (isspace(*opt)) opt++; | |
1652 | if (*opt++ != '=') | |
1653 | { | |
1654 | *log_msgptr = string_sprintf("'=' expected after " | |
1655 | "\"callout_overaall\" in ACL condition \"%s\"", arg); | |
1656 | return ERROR; | |
1657 | } | |
1658 | while (isspace(*opt)) opt++; | |
1659 | callout_connect = readconf_readtime(opt, 0, FALSE); | |
1660 | if (callout_connect < 0) | |
1661 | { | |
1662 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1663 | "\"verify %s\"", arg); | |
1664 | return ERROR; | |
1665 | } | |
1666 | } | |
059ec3d9 PH |
1667 | else /* Plain time is callout connect/command timeout */ |
1668 | { | |
1669 | callout = readconf_readtime(opt, 0, FALSE); | |
1670 | if (callout < 0) | |
1671 | { | |
1672 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1673 | "\"verify %s\"", arg); | |
1674 | return ERROR; | |
1675 | } | |
1676 | } | |
1677 | } | |
1678 | } | |
1679 | else | |
1680 | { | |
1681 | *log_msgptr = string_sprintf("'=' expected after \"callout\" in " | |
1682 | "ACL condition \"%s\"", arg); | |
1683 | return ERROR; | |
1684 | } | |
1685 | } | |
1686 | } | |
1687 | ||
1688 | /* Option not recognized */ | |
1689 | ||
1690 | else | |
1691 | { | |
1692 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " | |
1693 | "condition \"verify %s\"", ss, arg); | |
1694 | return ERROR; | |
1695 | } | |
1696 | } | |
1697 | ||
1698 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == | |
1699 | (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1700 | { | |
1701 | *log_msgptr = US"only one of use_sender and use_postmaster can be set " | |
1702 | "for a recipient callout"; | |
1703 | return ERROR; | |
1704 | } | |
1705 | ||
1706 | /* Handle sender-in-header verification. Default the user message to the log | |
1707 | message if giving out verification details. */ | |
1708 | ||
1709 | if (verify_header_sender) | |
1710 | { | |
8e669ac1 | 1711 | int verrno; |
059ec3d9 | 1712 | rc = verify_check_header_address(user_msgptr, log_msgptr, callout, |
fe5b5d0b PH |
1713 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, verify_options, |
1714 | &verrno); | |
1715 | if (rc != OK) | |
8e669ac1 | 1716 | { |
fe5b5d0b PH |
1717 | *basic_errno = verrno; |
1718 | if (smtp_return_error_details) | |
1719 | { | |
1720 | if (*user_msgptr == NULL && *log_msgptr != NULL) | |
1721 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1722 | if (rc == DEFER) acl_temp_details = TRUE; | |
1723 | } | |
8e669ac1 | 1724 | } |
059ec3d9 PH |
1725 | } |
1726 | ||
1727 | /* Handle a sender address. The default is to verify *the* sender address, but | |
1728 | optionally a different address can be given, for special requirements. If the | |
1729 | address is empty, we are dealing with a bounce message that has no sender, so | |
1730 | we cannot do any checking. If the real sender address gets rewritten during | |
1731 | verification (e.g. DNS widening), set the flag to stop it being rewritten again | |
1732 | during message reception. | |
1733 | ||
1734 | A list of verified "sender" addresses is kept to try to avoid doing to much | |
1735 | work repetitively when there are multiple recipients in a message and they all | |
1736 | require sender verification. However, when callouts are involved, it gets too | |
1737 | complicated because different recipients may require different callout options. | |
1738 | Therefore, we always do a full sender verify when any kind of callout is | |
1739 | specified. Caching elsewhere, for instance in the DNS resolver and in the | |
1740 | callout handling, should ensure that this is not terribly inefficient. */ | |
1741 | ||
1742 | else if (verify_sender_address != NULL) | |
1743 | { | |
1744 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1745 | != 0) | |
1746 | { | |
1747 | *log_msgptr = US"use_sender or use_postmaster cannot be used for a " | |
1748 | "sender verify callout"; | |
1749 | return ERROR; | |
1750 | } | |
1751 | ||
1752 | sender_vaddr = verify_checked_sender(verify_sender_address); | |
1753 | if (sender_vaddr != NULL && /* Previously checked */ | |
1754 | callout <= 0) /* No callout needed this time */ | |
1755 | { | |
1756 | /* If the "routed" flag is set, it means that routing worked before, so | |
1757 | this check can give OK (the saved return code value, if set, belongs to a | |
1758 | callout that was done previously). If the "routed" flag is not set, routing | |
1759 | must have failed, so we use the saved return code. */ | |
1760 | ||
1761 | if (testflag(sender_vaddr, af_verify_routed)) rc = OK; else | |
1762 | { | |
1763 | rc = sender_vaddr->special_action; | |
1764 | *basic_errno = sender_vaddr->basic_errno; | |
1765 | } | |
1766 | HDEBUG(D_acl) debug_printf("using cached sender verify result\n"); | |
1767 | } | |
1768 | ||
1769 | /* Do a new verification, and cache the result. The cache is used to avoid | |
1770 | verifying the sender multiple times for multiple RCPTs when callouts are not | |
1771 | specified (see comments above). | |
1772 | ||
1773 | The cache is also used on failure to give details in response to the first | |
1774 | RCPT that gets bounced for this reason. However, this can be suppressed by | |
1775 | the no_details option, which sets the flag that says "this detail has already | |
1776 | been sent". The cache normally contains just one address, but there may be | |
1777 | more in esoteric circumstances. */ | |
1778 | ||
1779 | else | |
1780 | { | |
1781 | BOOL routed = TRUE; | |
2a3eea10 | 1782 | uschar *save_address_data = deliver_address_data; |
8e669ac1 | 1783 | |
059ec3d9 PH |
1784 | sender_vaddr = deliver_make_addr(verify_sender_address, TRUE); |
1785 | if (no_details) setflag(sender_vaddr, af_sverify_told); | |
1786 | if (verify_sender_address[0] != 0) | |
1787 | { | |
1788 | /* If this is the real sender address, save the unrewritten version | |
1789 | for use later in receive. Otherwise, set a flag so that rewriting the | |
1790 | sender in verify_address() does not update sender_address. */ | |
1791 | ||
1792 | if (verify_sender_address == sender_address) | |
1793 | sender_address_unrewritten = sender_address; | |
1794 | else | |
1795 | verify_options |= vopt_fake_sender; | |
1796 | ||
eafd343b TK |
1797 | if (success_on_redirect) |
1798 | verify_options |= vopt_success_on_redirect; | |
1799 | ||
059ec3d9 PH |
1800 | /* The recipient, qualify, and expn options are never set in |
1801 | verify_options. */ | |
1802 | ||
1803 | rc = verify_address(sender_vaddr, NULL, verify_options, callout, | |
4deaf07d | 1804 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, &routed); |
059ec3d9 PH |
1805 | |
1806 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); | |
1807 | ||
1808 | if (rc == OK) | |
1809 | { | |
1810 | if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0) | |
1811 | { | |
1812 | DEBUG(D_acl) debug_printf("sender %s verified ok as %s\n", | |
1813 | verify_sender_address, sender_vaddr->address); | |
1814 | } | |
1815 | else | |
1816 | { | |
1817 | DEBUG(D_acl) debug_printf("sender %s verified ok\n", | |
1818 | verify_sender_address); | |
1819 | } | |
1820 | } | |
1821 | else *basic_errno = sender_vaddr->basic_errno; | |
1822 | } | |
1823 | else rc = OK; /* Null sender */ | |
1824 | ||
1825 | /* Cache the result code */ | |
1826 | ||
1827 | if (routed) setflag(sender_vaddr, af_verify_routed); | |
1828 | if (callout > 0) setflag(sender_vaddr, af_verify_callout); | |
1829 | sender_vaddr->special_action = rc; | |
1830 | sender_vaddr->next = sender_verified_list; | |
1831 | sender_verified_list = sender_vaddr; | |
8e669ac1 PH |
1832 | |
1833 | /* Restore the recipient address data, which might have been clobbered by | |
2a3eea10 | 1834 | the sender verification. */ |
8e669ac1 | 1835 | |
2a3eea10 | 1836 | deliver_address_data = save_address_data; |
059ec3d9 | 1837 | } |
8e669ac1 | 1838 | |
2a3eea10 PH |
1839 | /* Put the sender address_data value into $sender_address_data */ |
1840 | ||
8e669ac1 | 1841 | sender_address_data = sender_vaddr->p.address_data; |
059ec3d9 PH |
1842 | } |
1843 | ||
1844 | /* A recipient address just gets a straightforward verify; again we must handle | |
1845 | the DEFER overrides. */ | |
1846 | ||
1847 | else | |
1848 | { | |
1849 | address_item addr2; | |
1850 | ||
eafd343b TK |
1851 | if (success_on_redirect) |
1852 | verify_options |= vopt_success_on_redirect; | |
1853 | ||
059ec3d9 PH |
1854 | /* We must use a copy of the address for verification, because it might |
1855 | get rewritten. */ | |
1856 | ||
1857 | addr2 = *addr; | |
1858 | rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout, | |
4deaf07d | 1859 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, NULL); |
059ec3d9 | 1860 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); |
8e669ac1 | 1861 | |
059ec3d9 | 1862 | *log_msgptr = addr2.message; |
8e669ac1 | 1863 | *user_msgptr = (addr2.user_message != NULL)? |
6729cf78 | 1864 | addr2.user_message : addr2.message; |
059ec3d9 PH |
1865 | *basic_errno = addr2.basic_errno; |
1866 | ||
1867 | /* Make $address_data visible */ | |
1868 | deliver_address_data = addr2.p.address_data; | |
1869 | } | |
1870 | ||
1871 | /* We have a result from the relevant test. Handle defer overrides first. */ | |
1872 | ||
1873 | if (rc == DEFER && (defer_ok || | |
1874 | (callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER))) | |
1875 | { | |
1876 | HDEBUG(D_acl) debug_printf("verify defer overridden by %s\n", | |
1877 | defer_ok? "defer_ok" : "callout_defer_ok"); | |
1878 | rc = OK; | |
1879 | } | |
1880 | ||
1881 | /* If we've failed a sender, set up a recipient message, and point | |
1882 | sender_verified_failed to the address item that actually failed. */ | |
1883 | ||
1884 | if (rc != OK && verify_sender_address != NULL) | |
1885 | { | |
1886 | if (rc != DEFER) | |
1887 | { | |
1888 | *log_msgptr = *user_msgptr = US"Sender verify failed"; | |
1889 | } | |
1890 | else if (*basic_errno != ERRNO_CALLOUTDEFER) | |
1891 | { | |
1892 | *log_msgptr = *user_msgptr = US"Could not complete sender verify"; | |
1893 | } | |
1894 | else | |
1895 | { | |
1896 | *log_msgptr = US"Could not complete sender verify callout"; | |
1897 | *user_msgptr = smtp_return_error_details? sender_vaddr->user_message : | |
1898 | *log_msgptr; | |
1899 | } | |
1900 | ||
1901 | sender_verified_failed = sender_vaddr; | |
1902 | } | |
1903 | ||
1904 | /* Verifying an address messes up the values of $domain and $local_part, | |
1905 | so reset them before returning if this is a RCPT ACL. */ | |
1906 | ||
1907 | if (addr != NULL) | |
1908 | { | |
1909 | deliver_domain = addr->domain; | |
1910 | deliver_localpart = addr->local_part; | |
1911 | } | |
1912 | return rc; | |
1913 | ||
1914 | /* Syntax errors in the verify argument come here. */ | |
1915 | ||
1916 | BAD_VERIFY: | |
1917 | *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", " | |
596875b3 PH |
1918 | "\"helo\", \"header_syntax\", \"header_sender\" or " |
1919 | "\"reverse_host_lookup\" at start of ACL condition " | |
059ec3d9 PH |
1920 | "\"verify %s\"", arg); |
1921 | return ERROR; | |
596875b3 PH |
1922 | |
1923 | /* Options supplied when not allowed come here */ | |
1924 | ||
1925 | NO_OPTIONS: | |
1926 | *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" " | |
1927 | "(this verify item has no options)", arg); | |
1928 | return ERROR; | |
1c41c9cc PH |
1929 | |
1930 | /* Calls in the wrong ACL come here */ | |
1931 | ||
1932 | WRONG_ACL: | |
1933 | *log_msgptr = string_sprintf("cannot check header contents in ACL for %s " | |
1934 | "(only possible in ACL for DATA)", acl_wherenames[where]); | |
1935 | return ERROR; | |
059ec3d9 PH |
1936 | } |
1937 | ||
1938 | ||
1939 | ||
1940 | ||
1941 | /************************************************* | |
1942 | * Check argument for control= modifier * | |
1943 | *************************************************/ | |
1944 | ||
1945 | /* Called from acl_check_condition() below | |
1946 | ||
1947 | Arguments: | |
1948 | arg the argument string for control= | |
1949 | pptr set to point to the terminating character | |
1950 | where which ACL we are in | |
1951 | log_msgptr for error messages | |
1952 | ||
1953 | Returns: CONTROL_xxx value | |
1954 | */ | |
1955 | ||
1956 | static int | |
1957 | decode_control(uschar *arg, uschar **pptr, int where, uschar **log_msgptr) | |
1958 | { | |
1959 | int len; | |
1960 | control_def *d; | |
1961 | ||
1962 | for (d = controls_list; | |
1963 | d < controls_list + sizeof(controls_list)/sizeof(control_def); | |
1964 | d++) | |
1965 | { | |
1966 | len = Ustrlen(d->name); | |
1967 | if (Ustrncmp(d->name, arg, len) == 0) break; | |
1968 | } | |
1969 | ||
1970 | if (d >= controls_list + sizeof(controls_list)/sizeof(control_def) || | |
1971 | (arg[len] != 0 && (!d->has_option || arg[len] != '/'))) | |
1972 | { | |
1973 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
1974 | return CONTROL_ERROR; | |
1975 | } | |
1976 | ||
059ec3d9 PH |
1977 | *pptr = arg + len; |
1978 | return d->value; | |
1979 | } | |
1980 | ||
1981 | ||
1982 | ||
870f6ba8 TF |
1983 | /************************************************* |
1984 | * Handle rate limiting * | |
1985 | *************************************************/ | |
1986 | ||
1987 | /* Called by acl_check_condition() below to calculate the result | |
1988 | of the ACL ratelimit condition. | |
1989 | ||
1990 | Note that the return value might be slightly unexpected: if the | |
1991 | sender's rate is above the limit then the result is OK. This is | |
1992 | similar to the dnslists condition, and is so that you can write | |
1993 | ACL clauses like: defer ratelimit = 15 / 1h | |
1994 | ||
1995 | Arguments: | |
1996 | arg the option string for ratelimit= | |
1997 | log_msgptr for error messages | |
1998 | ||
1999 | Returns: OK - Sender's rate is above limit | |
2000 | FAIL - Sender's rate is below limit | |
2001 | DEFER - Problem opening ratelimit database | |
2002 | ERROR - Syntax error in options. | |
2003 | */ | |
2004 | ||
2005 | static int | |
2006 | acl_ratelimit(uschar *arg, uschar **log_msgptr) | |
2007 | { | |
2008 | double limit, period; | |
f3dcf4a2 | 2009 | uschar *ss, *key; |
870f6ba8 TF |
2010 | int sep = '/'; |
2011 | BOOL have_key = FALSE, leaky = FALSE, strict = FALSE; | |
2012 | BOOL per_byte = FALSE, per_cmd = FALSE, per_conn = FALSE, per_mail = FALSE; | |
2013 | int old_pool, rc; | |
2014 | tree_node **anchor, *t; | |
2015 | open_db dbblock, *dbm; | |
2016 | dbdata_ratelimit *dbd; | |
2017 | struct timeval tv; | |
2018 | ||
2019 | /* Parse the first two options and record their values in expansion | |
2020 | variables. These variables allow the configuration to have informative | |
2021 | error messages based on rate limits obtained from a table lookup. */ | |
2022 | ||
2023 | /* First is the maximum number of messages per period and maximum burst | |
2024 | size, which must be greater than or equal to zero. Zero is useful for | |
2025 | rate measurement as opposed to rate limiting. */ | |
2026 | ||
2027 | sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0); | |
2028 | if (sender_rate_limit == NULL) | |
2029 | limit = -1.0; | |
2030 | else | |
2031 | { | |
2032 | limit = Ustrtod(sender_rate_limit, &ss); | |
2033 | if (tolower(*ss) == 'k') { limit *= 1024.0; ss++; } | |
2034 | else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; } | |
2035 | else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; } | |
2036 | } | |
2037 | if (limit < 0.0 || *ss != 0) | |
2038 | { | |
2039 | *log_msgptr = string_sprintf("syntax error in argument for " | |
2040 | "\"ratelimit\" condition: \"%s\" is not a positive number", | |
2041 | sender_rate_limit); | |
2042 | return ERROR; | |
2043 | } | |
2044 | ||
f3dcf4a2 TF |
2045 | /* We use the rest of the argument list following the limit as the |
2046 | lookup key, because it doesn't make sense to use the same stored data | |
2047 | if the period or options are different. */ | |
2048 | ||
2049 | key = arg; | |
2050 | ||
870f6ba8 TF |
2051 | /* Second is the rate measurement period and exponential smoothing time |
2052 | constant. This must be strictly greater than zero, because zero leads to | |
2053 | run-time division errors. */ | |
2054 | ||
2055 | sender_rate_period = string_nextinlist(&arg, &sep, NULL, 0); | |
2056 | if (sender_rate_period == NULL) period = -1.0; | |
2057 | else period = readconf_readtime(sender_rate_period, 0, FALSE); | |
2058 | if (period <= 0.0) | |
2059 | { | |
2060 | *log_msgptr = string_sprintf("syntax error in argument for " | |
2061 | "\"ratelimit\" condition: \"%s\" is not a time value", | |
2062 | sender_rate_period); | |
2063 | return ERROR; | |
2064 | } | |
2065 | ||
2066 | /* Parse the other options. Should we check if the per_* options are being | |
2067 | used in ACLs where they don't make sense, e.g. per_mail in the connect ACL? */ | |
2068 | ||
2069 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2070 | != NULL) | |
2071 | { | |
2072 | if (strcmpic(ss, US"leaky") == 0) leaky = TRUE; | |
2073 | else if (strcmpic(ss, US"strict") == 0) strict = TRUE; | |
2074 | else if (strcmpic(ss, US"per_byte") == 0) per_byte = TRUE; | |
2075 | else if (strcmpic(ss, US"per_cmd") == 0) per_cmd = TRUE; | |
2076 | else if (strcmpic(ss, US"per_conn") == 0) per_conn = TRUE; | |
2077 | else if (strcmpic(ss, US"per_mail") == 0) per_mail = TRUE; | |
2078 | else if (strcmpic(ss, US"per_rcpt") == 0) per_cmd = TRUE; /* alias */ | |
2079 | else have_key = TRUE; | |
2080 | } | |
2081 | if (leaky + strict > 1 || per_byte + per_cmd + per_conn + per_mail > 1) | |
2082 | { | |
2083 | *log_msgptr = US"conflicting options for \"ratelimit\" condition"; | |
2084 | return ERROR; | |
2085 | } | |
2086 | ||
2087 | /* Default option values */ | |
2088 | if (!strict) leaky = TRUE; | |
2089 | if (!per_byte && !per_cmd && !per_conn) per_mail = TRUE; | |
2090 | ||
f3dcf4a2 | 2091 | /* If there is no explicit key, use the sender_host_address. If there is no |
870f6ba8 TF |
2092 | sender_host_address (e.g. -bs or acl_not_smtp) then we simply omit it. */ |
2093 | ||
2094 | if (!have_key && sender_host_address != NULL) | |
2095 | key = string_sprintf("%s / %s", key, sender_host_address); | |
2096 | ||
2097 | HDEBUG(D_acl) debug_printf("ratelimit condition limit=%.0f period=%.0f key=%s\n", | |
2098 | limit, period, key); | |
2099 | ||
fe0dab11 | 2100 | /* See if we have already computed the rate by looking in the relevant tree. For |
870f6ba8 TF |
2101 | per-connection rate limiting, store tree nodes and dbdata in the permanent pool |
2102 | so that they survive across resets. */ | |
2103 | ||
2104 | anchor = NULL; | |
2105 | old_pool = store_pool; | |
2106 | ||
2107 | if (per_conn) | |
2108 | { | |
2109 | anchor = &ratelimiters_conn; | |
2110 | store_pool = POOL_PERM; | |
2111 | } | |
fe0dab11 | 2112 | else if (per_mail || per_byte) |
870f6ba8 | 2113 | anchor = &ratelimiters_mail; |
fe0dab11 TF |
2114 | else if (per_cmd) |
2115 | anchor = &ratelimiters_cmd; | |
870f6ba8 TF |
2116 | |
2117 | if (anchor != NULL && (t = tree_search(*anchor, key)) != NULL) | |
2118 | { | |
2119 | dbd = t->data.ptr; | |
2120 | /* The following few lines duplicate some of the code below. */ | |
3348576f TF |
2121 | if (dbd->rate < limit) rc = FAIL; |
2122 | else rc = OK; | |
870f6ba8 TF |
2123 | store_pool = old_pool; |
2124 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2125 | HDEBUG(D_acl) | |
2126 | debug_printf("ratelimit found pre-computed rate %s\n", sender_rate); | |
2127 | return rc; | |
2128 | } | |
2129 | ||
2130 | /* We aren't using a pre-computed rate, so get a previously recorded | |
2131 | rate from the database, update it, and write it back. If there's no | |
2132 | previous rate for this key, create one. */ | |
2133 | ||
2134 | dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE); | |
2135 | if (dbm == NULL) | |
2136 | { | |
2137 | store_pool = old_pool; | |
2138 | sender_rate = NULL; | |
2139 | HDEBUG(D_acl) debug_printf("ratelimit database not available\n"); | |
2140 | *log_msgptr = US"ratelimit database not available"; | |
2141 | return DEFER; | |
2142 | } | |
2143 | dbd = dbfn_read(dbm, key); | |
2144 | ||
2145 | gettimeofday(&tv, NULL); | |
2146 | ||
2147 | if (dbd == NULL) | |
2148 | { | |
2149 | HDEBUG(D_acl) debug_printf("ratelimit initializing new key's data\n"); | |
2150 | dbd = store_get(sizeof(dbdata_ratelimit)); | |
2151 | dbd->time_stamp = tv.tv_sec; | |
2152 | dbd->time_usec = tv.tv_usec; | |
2153 | dbd->rate = 0.0; | |
2154 | } | |
2155 | else | |
2156 | { | |
2157 | /* The smoothed rate is computed using an exponentially weighted moving | |
2158 | average adjusted for variable sampling intervals. The standard EWMA for | |
2159 | a fixed sampling interval is: f'(t) = (1 - a) * f(t) + a * f'(t - 1) | |
2160 | where f() is the measured value and f'() is the smoothed value. | |
2161 | ||
2162 | Old data decays out of the smoothed value exponentially, such that data n | |
2163 | samples old is multiplied by a^n. The exponential decay time constant p | |
2164 | is defined such that data p samples old is multiplied by 1/e, which means | |
2165 | that a = exp(-1/p). We can maintain the same time constant for a variable | |
2166 | sampling interval i by using a = exp(-i/p). | |
2167 | ||
2168 | The rate we are measuring is messages per period, suitable for directly | |
2169 | comparing with the limit. The average rate between now and the previous | |
2170 | message is period / interval, which we feed into the EWMA as the sample. | |
2171 | ||
2172 | It turns out that the number of messages required for the smoothed rate | |
2173 | to reach the limit when they are sent in a burst is equal to the limit. | |
2174 | This can be seen by analysing the value of the smoothed rate after N | |
2175 | messages sent at even intervals. Let k = (1 - a) * p/i | |
2176 | ||
2177 | rate_1 = (1 - a) * p/i + a * rate_0 | |
2178 | = k + a * rate_0 | |
2179 | rate_2 = k + a * rate_1 | |
2180 | = k + a * k + a^2 * rate_0 | |
2181 | rate_3 = k + a * k + a^2 * k + a^3 * rate_0 | |
2182 | rate_N = rate_0 * a^N + k * SUM(x=0..N-1)(a^x) | |
2183 | = rate_0 * a^N + k * (1 - a^N) / (1 - a) | |
2184 | = rate_0 * a^N + p/i * (1 - a^N) | |
2185 | ||
2186 | When N is large, a^N -> 0 so rate_N -> p/i as desired. | |
2187 | ||
2188 | rate_N = p/i + (rate_0 - p/i) * a^N | |
2189 | a^N = (rate_N - p/i) / (rate_0 - p/i) | |
2190 | N * -i/p = log((rate_N - p/i) / (rate_0 - p/i)) | |
2191 | N = p/i * log((rate_0 - p/i) / (rate_N - p/i)) | |
2192 | ||
2193 | Numerical analysis of the above equation, setting the computed rate to | |
2194 | increase from rate_0 = 0 to rate_N = limit, shows that for large sending | |
2195 | rates, p/i, the number of messages N = limit. So limit serves as both the | |
2196 | maximum rate measured in messages per period, and the maximum number of | |
2197 | messages that can be sent in a fast burst. */ | |
2198 | ||
2199 | double this_time = (double)tv.tv_sec | |
2200 | + (double)tv.tv_usec / 1000000.0; | |
2201 | double prev_time = (double)dbd->time_stamp | |
2202 | + (double)dbd->time_usec / 1000000.0; | |
870f6ba8 TF |
2203 | |
2204 | /* We must avoid division by zero, and deal gracefully with the clock going | |
2205 | backwards. If we blunder ahead when time is in reverse then the computed | |
e5d5a95f | 2206 | rate will be bogus. To be safe we clamp interval to a very small number. */ |
870f6ba8 | 2207 | |
e5d5a95f TF |
2208 | double interval = this_time - prev_time <= 0.0 ? 1e-9 |
2209 | : this_time - prev_time; | |
2210 | ||
2211 | double i_over_p = interval / period; | |
2212 | double a = exp(-i_over_p); | |
870f6ba8 TF |
2213 | |
2214 | dbd->time_stamp = tv.tv_sec; | |
2215 | dbd->time_usec = tv.tv_usec; | |
2216 | ||
2217 | /* If we are measuring the rate in bytes per period, multiply the | |
2218 | measured rate by the message size. If we don't know the message size | |
2219 | then it's safe to just use a value of zero and let the recorded rate | |
2220 | decay as if nothing happened. */ | |
2221 | ||
2222 | if (per_byte) | |
2223 | dbd->rate = (message_size < 0 ? 0.0 : (double)message_size) | |
2224 | * (1 - a) / i_over_p + a * dbd->rate; | |
2225 | else | |
2226 | dbd->rate = (1 - a) / i_over_p + a * dbd->rate; | |
2227 | } | |
2228 | ||
3348576f TF |
2229 | /* Clients sending at the limit are considered to be over the limit. This |
2230 | matters for edge cases such the first message sent by a client (which gets | |
2231 | the initial rate of 0.0) when the rate limit is zero (i.e. the client should | |
2232 | be completely blocked). */ | |
2233 | ||
2234 | if (dbd->rate < limit) rc = FAIL; | |
2235 | else rc = OK; | |
870f6ba8 TF |
2236 | |
2237 | /* Update the state if the rate is low or if we are being strict. If we | |
2238 | are in leaky mode and the sender's rate is too high, we do not update | |
2239 | the recorded rate in order to avoid an over-aggressive sender's retry | |
2240 | rate preventing them from getting any email through. */ | |
2241 | ||
2242 | if (rc == FAIL || !leaky) | |
2243 | dbfn_write(dbm, key, dbd, sizeof(dbdata_ratelimit)); | |
2244 | dbfn_close(dbm); | |
2245 | ||
2246 | /* Store the result in the tree for future reference, if necessary. */ | |
2247 | ||
2248 | if (anchor != NULL) | |
2249 | { | |
2250 | t = store_get(sizeof(tree_node) + Ustrlen(key)); | |
2251 | t->data.ptr = dbd; | |
2252 | Ustrcpy(t->name, key); | |
2253 | (void)tree_insertnode(anchor, t); | |
2254 | } | |
2255 | ||
2256 | /* We create the formatted version of the sender's rate very late in | |
2257 | order to ensure that it is done using the correct storage pool. */ | |
2258 | ||
2259 | store_pool = old_pool; | |
2260 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2261 | ||
2262 | HDEBUG(D_acl) | |
2263 | debug_printf("ratelimit computed rate %s\n", sender_rate); | |
2264 | ||
2265 | return rc; | |
2266 | } | |
2267 | ||
2268 | ||
2269 | ||
059ec3d9 PH |
2270 | /************************************************* |
2271 | * Handle conditions/modifiers on an ACL item * | |
2272 | *************************************************/ | |
2273 | ||
2274 | /* Called from acl_check() below. | |
2275 | ||
2276 | Arguments: | |
2277 | verb ACL verb | |
2278 | cb ACL condition block - if NULL, result is OK | |
2279 | where where called from | |
2280 | addr the address being checked for RCPT, or NULL | |
2281 | level the nesting level | |
2282 | epp pointer to pass back TRUE if "endpass" encountered | |
2283 | (applies only to "accept" and "discard") | |
2284 | user_msgptr user message pointer | |
2285 | log_msgptr log message pointer | |
2286 | basic_errno pointer to where to put verify error | |
2287 | ||
2288 | Returns: OK - all conditions are met | |
2289 | DISCARD - an "acl" condition returned DISCARD - only allowed | |
2290 | for "accept" or "discard" verbs | |
2291 | FAIL - at least one condition fails | |
2292 | FAIL_DROP - an "acl" condition returned FAIL_DROP | |
2293 | DEFER - can't tell at the moment (typically, lookup defer, | |
2294 | but can be temporary callout problem) | |
2295 | ERROR - ERROR from nested ACL or expansion failure or other | |
2296 | error | |
2297 | */ | |
2298 | ||
2299 | static int | |
2300 | acl_check_condition(int verb, acl_condition_block *cb, int where, | |
2301 | address_item *addr, int level, BOOL *epp, uschar **user_msgptr, | |
2302 | uschar **log_msgptr, int *basic_errno) | |
2303 | { | |
2304 | uschar *user_message = NULL; | |
2305 | uschar *log_message = NULL; | |
2306 | uschar *p; | |
2307 | int rc = OK; | |
8523533c TK |
2308 | #ifdef WITH_CONTENT_SCAN |
2309 | int sep = '/'; | |
2310 | #endif | |
059ec3d9 PH |
2311 | |
2312 | for (; cb != NULL; cb = cb->next) | |
2313 | { | |
2314 | uschar *arg; | |
8e669ac1 | 2315 | int control_type; |
059ec3d9 PH |
2316 | |
2317 | /* The message and log_message items set up messages to be used in | |
2318 | case of rejection. They are expanded later. */ | |
2319 | ||
2320 | if (cb->type == ACLC_MESSAGE) | |
2321 | { | |
2322 | user_message = cb->arg; | |
2323 | continue; | |
2324 | } | |
2325 | ||
2326 | if (cb->type == ACLC_LOG_MESSAGE) | |
2327 | { | |
2328 | log_message = cb->arg; | |
2329 | continue; | |
2330 | } | |
2331 | ||
2332 | /* The endpass "condition" just sets a flag to show it occurred. This is | |
2333 | checked at compile time to be on an "accept" or "discard" item. */ | |
2334 | ||
2335 | if (cb->type == ACLC_ENDPASS) | |
2336 | { | |
2337 | *epp = TRUE; | |
2338 | continue; | |
2339 | } | |
2340 | ||
2341 | /* For other conditions and modifiers, the argument is expanded now for some | |
2342 | of them, but not for all, because expansion happens down in some lower level | |
2343 | checking functions in some cases. */ | |
2344 | ||
2345 | if (cond_expand_at_top[cb->type]) | |
2346 | { | |
2347 | arg = expand_string(cb->arg); | |
2348 | if (arg == NULL) | |
2349 | { | |
2350 | if (expand_string_forcedfail) continue; | |
2351 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
2352 | cb->arg, expand_string_message); | |
2353 | return search_find_defer? DEFER : ERROR; | |
2354 | } | |
2355 | } | |
2356 | else arg = cb->arg; | |
2357 | ||
2358 | /* Show condition, and expanded condition if it's different */ | |
2359 | ||
2360 | HDEBUG(D_acl) | |
2361 | { | |
2362 | int lhswidth = 0; | |
2363 | debug_printf("check %s%s %n", | |
2364 | (!cond_modifiers[cb->type] && cb->u.negated)? "!":"", | |
2365 | conditions[cb->type], &lhswidth); | |
2366 | ||
2367 | if (cb->type == ACLC_SET) | |
2368 | { | |
2369 | int n = cb->u.varnumber; | |
47ca6d6c PH |
2370 | int t = (n < ACL_CVARS)? 'c' : 'm'; |
2371 | if (n >= ACL_CVARS) n -= ACL_CVARS; | |
059ec3d9 PH |
2372 | debug_printf("acl_%c%d ", t, n); |
2373 | lhswidth += 7; | |
2374 | } | |
2375 | ||
2376 | debug_printf("= %s\n", cb->arg); | |
2377 | ||
2378 | if (arg != cb->arg) | |
2379 | debug_printf("%.*s= %s\n", lhswidth, | |
2380 | US" ", CS arg); | |
2381 | } | |
2382 | ||
2383 | /* Check that this condition makes sense at this time */ | |
2384 | ||
2385 | if ((cond_forbids[cb->type] & (1 << where)) != 0) | |
2386 | { | |
2387 | *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL", | |
2388 | cond_modifiers[cb->type]? "use" : "test", | |
2389 | conditions[cb->type], acl_wherenames[where]); | |
2390 | return ERROR; | |
2391 | } | |
2392 | ||
2393 | /* Run the appropriate test for each condition, or take the appropriate | |
2394 | action for the remaining modifiers. */ | |
2395 | ||
2396 | switch(cb->type) | |
2397 | { | |
2398 | /* A nested ACL that returns "discard" makes sense only for an "accept" or | |
2399 | "discard" verb. */ | |
6a3f1455 | 2400 | \ |
059ec3d9 PH |
2401 | case ACLC_ACL: |
2402 | rc = acl_check_internal(where, addr, arg, level+1, user_msgptr, log_msgptr); | |
2403 | if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD) | |
2404 | { | |
2405 | *log_msgptr = string_sprintf("nested ACL returned \"discard\" for " | |
2406 | "\"%s\" command (only allowed with \"accept\" or \"discard\")", | |
2407 | verbs[verb]); | |
2408 | return ERROR; | |
2409 | } | |
2410 | break; | |
2411 | ||
2412 | case ACLC_AUTHENTICATED: | |
2413 | rc = (sender_host_authenticated == NULL)? FAIL : | |
2414 | match_isinlist(sender_host_authenticated, &arg, 0, NULL, NULL, MCL_STRING, | |
2415 | TRUE, NULL); | |
2416 | break; | |
2417 | ||
8523533c TK |
2418 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
2419 | case ACLC_BMI_OPTIN: | |
2420 | { | |
2421 | int old_pool = store_pool; | |
2422 | store_pool = POOL_PERM; | |
2423 | bmi_current_optin = string_copy(arg); | |
2424 | store_pool = old_pool; | |
2425 | } | |
2426 | break; | |
2427 | #endif | |
2428 | ||
059ec3d9 PH |
2429 | case ACLC_CONDITION: |
2430 | if (Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */ | |
2431 | rc = (Uatoi(arg) == 0)? FAIL : OK; | |
2432 | else | |
2433 | rc = (strcmpic(arg, US"no") == 0 || | |
2434 | strcmpic(arg, US"false") == 0)? FAIL : | |
2435 | (strcmpic(arg, US"yes") == 0 || | |
2436 | strcmpic(arg, US"true") == 0)? OK : DEFER; | |
2437 | if (rc == DEFER) | |
2438 | *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg); | |
2439 | break; | |
2440 | ||
2441 | case ACLC_CONTROL: | |
c5fcb476 PH |
2442 | control_type = decode_control(arg, &p, where, log_msgptr); |
2443 | ||
8523533c | 2444 | /* Check if this control makes sense at this time */ |
c5fcb476 PH |
2445 | |
2446 | if ((control_forbids[control_type] & (1 << where)) != 0) | |
2447 | { | |
2448 | *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL", | |
2449 | controls[control_type], acl_wherenames[where]); | |
2450 | return ERROR; | |
8e669ac1 | 2451 | } |
c5fcb476 PH |
2452 | |
2453 | switch(control_type) | |
059ec3d9 | 2454 | { |
c46782ef PH |
2455 | case CONTROL_AUTH_UNADVERTISED: |
2456 | allow_auth_unadvertised = TRUE; | |
2457 | break; | |
2458 | ||
2459 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
8523533c TK |
2460 | case CONTROL_BMI_RUN: |
2461 | bmi_run = 1; | |
2462 | break; | |
c46782ef PH |
2463 | #endif |
2464 | ||
2465 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
fb2274d4 TK |
2466 | case CONTROL_DK_VERIFY: |
2467 | dk_do_verify = 1; | |
2468 | break; | |
c46782ef PH |
2469 | #endif |
2470 | ||
059ec3d9 PH |
2471 | case CONTROL_ERROR: |
2472 | return ERROR; | |
2473 | ||
2474 | case CONTROL_CASEFUL_LOCAL_PART: | |
2475 | deliver_localpart = addr->cc_local_part; | |
2476 | break; | |
2477 | ||
2478 | case CONTROL_CASELOWER_LOCAL_PART: | |
2479 | deliver_localpart = addr->lc_local_part; | |
2480 | break; | |
2481 | ||
2482 | case CONTROL_ENFORCE_SYNC: | |
2483 | smtp_enforce_sync = TRUE; | |
2484 | break; | |
2485 | ||
2486 | case CONTROL_NO_ENFORCE_SYNC: | |
2487 | smtp_enforce_sync = FALSE; | |
2488 | break; | |
2489 | ||
c46782ef | 2490 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
2491 | case CONTROL_NO_MBOX_UNSPOOL: |
2492 | no_mbox_unspool = TRUE; | |
2493 | break; | |
c46782ef | 2494 | #endif |
8523533c | 2495 | |
059ec3d9 PH |
2496 | case CONTROL_NO_MULTILINE: |
2497 | no_multiline_responses = TRUE; | |
2498 | break; | |
2499 | ||
29aba418 | 2500 | case CONTROL_FAKEDEFER: |
8523533c | 2501 | case CONTROL_FAKEREJECT: |
29aba418 | 2502 | fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL; |
8523533c | 2503 | if (*p == '/') |
8e669ac1 | 2504 | { |
8523533c | 2505 | uschar *pp = p + 1; |
8e669ac1 | 2506 | while (*pp != 0) pp++; |
29aba418 | 2507 | fake_response_text = expand_string(string_copyn(p+1, pp-p-1)); |
8523533c TK |
2508 | p = pp; |
2509 | } | |
2510 | else | |
2511 | { | |
2512 | /* Explicitly reset to default string */ | |
29aba418 | 2513 | 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)."; |
8523533c TK |
2514 | } |
2515 | break; | |
8523533c | 2516 | |
059ec3d9 PH |
2517 | case CONTROL_FREEZE: |
2518 | deliver_freeze = TRUE; | |
2519 | deliver_frozen_at = time(NULL); | |
6a3f1455 PH |
2520 | freeze_tell = freeze_tell_config; /* Reset to configured value */ |
2521 | if (Ustrncmp(p, "/no_tell", 8) == 0) | |
2522 | { | |
2523 | p += 8; | |
2524 | freeze_tell = NULL; | |
2525 | } | |
2526 | if (*p != 0) | |
2527 | { | |
2528 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2529 | return ERROR; | |
2530 | } | |
059ec3d9 PH |
2531 | break; |
2532 | ||
2533 | case CONTROL_QUEUE_ONLY: | |
2534 | queue_only_policy = TRUE; | |
2535 | break; | |
2536 | ||
2537 | case CONTROL_SUBMISSION: | |
87ba3f5f | 2538 | originator_name = US""; |
059ec3d9 | 2539 | submission_mode = TRUE; |
69358f02 | 2540 | while (*p == '/') |
8e669ac1 | 2541 | { |
69358f02 PH |
2542 | if (Ustrncmp(p, "/sender_retain", 14) == 0) |
2543 | { | |
2544 | p += 14; | |
2545 | active_local_sender_retain = TRUE; | |
8e669ac1 PH |
2546 | active_local_from_check = FALSE; |
2547 | } | |
69358f02 PH |
2548 | else if (Ustrncmp(p, "/domain=", 8) == 0) |
2549 | { | |
2550 | uschar *pp = p + 8; | |
8e669ac1 | 2551 | while (*pp != 0 && *pp != '/') pp++; |
87ba3f5f PH |
2552 | submission_domain = string_copyn(p+8, pp-p-8); |
2553 | p = pp; | |
2554 | } | |
8857ccfd PH |
2555 | /* The name= option must be last, because it swallows the rest of |
2556 | the string. */ | |
87ba3f5f PH |
2557 | else if (Ustrncmp(p, "/name=", 6) == 0) |
2558 | { | |
2559 | uschar *pp = p + 6; | |
8857ccfd | 2560 | while (*pp != 0) pp++; |
2fe1a124 | 2561 | submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6, |
87ba3f5f | 2562 | big_buffer, big_buffer_size)); |
8e669ac1 | 2563 | p = pp; |
69358f02 | 2564 | } |
8e669ac1 PH |
2565 | else break; |
2566 | } | |
69358f02 | 2567 | if (*p != 0) |
059ec3d9 | 2568 | { |
69358f02 | 2569 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); |
059ec3d9 PH |
2570 | return ERROR; |
2571 | } | |
2572 | break; | |
8800895a PH |
2573 | |
2574 | case CONTROL_SUPPRESS_LOCAL_FIXUPS: | |
2575 | suppress_local_fixups = TRUE; | |
2576 | break; | |
059ec3d9 PH |
2577 | } |
2578 | break; | |
2579 | ||
8523533c TK |
2580 | #ifdef WITH_CONTENT_SCAN |
2581 | case ACLC_DECODE: | |
2582 | rc = mime_decode(&arg); | |
2583 | break; | |
2584 | #endif | |
2585 | ||
059ec3d9 PH |
2586 | case ACLC_DELAY: |
2587 | { | |
2588 | int delay = readconf_readtime(arg, 0, FALSE); | |
2589 | if (delay < 0) | |
2590 | { | |
2591 | *log_msgptr = string_sprintf("syntax error in argument for \"delay\" " | |
2592 | "modifier: \"%s\" is not a time value", arg); | |
2593 | return ERROR; | |
2594 | } | |
2595 | else | |
2596 | { | |
2597 | HDEBUG(D_acl) debug_printf("delay modifier requests %d-second delay\n", | |
2598 | delay); | |
2599 | if (host_checking) | |
2600 | { | |
2601 | HDEBUG(D_acl) | |
2602 | debug_printf("delay skipped in -bh checking mode\n"); | |
2603 | } | |
010c2d14 PH |
2604 | |
2605 | /* It appears to be impossible to detect that a TCP/IP connection has | |
2606 | gone away without reading from it. This means that we cannot shorten | |
2607 | the delay below if the client goes away, because we cannot discover | |
2608 | that the client has closed its end of the connection. (The connection | |
2609 | is actually in a half-closed state, waiting for the server to close its | |
2610 | end.) It would be nice to be able to detect this state, so that the | |
2611 | Exim process is not held up unnecessarily. However, it seems that we | |
2612 | can't. The poll() function does not do the right thing, and in any case | |
2613 | it is not always available. | |
2614 | ||
2615 | NOTE: If ever this state of affairs changes, remember that we may be | |
2616 | dealing with stdin/stdout here, in addition to TCP/IP connections. | |
2617 | Whatever is done must work in both cases. To detected the stdin/stdout | |
2618 | case, check for smtp_in or smtp_out being NULL. */ | |
2619 | ||
8e669ac1 | 2620 | else |
86b8287f PH |
2621 | { |
2622 | while (delay > 0) delay = sleep(delay); | |
8e669ac1 | 2623 | } |
059ec3d9 PH |
2624 | } |
2625 | } | |
2626 | break; | |
2627 | ||
8523533c TK |
2628 | #ifdef WITH_OLD_DEMIME |
2629 | case ACLC_DEMIME: | |
2630 | rc = demime(&arg); | |
2631 | break; | |
2632 | #endif | |
2633 | ||
fb2274d4 TK |
2634 | #ifdef EXPERIMENTAL_DOMAINKEYS |
2635 | case ACLC_DK_DOMAIN_SOURCE: | |
2636 | if (dk_verify_block == NULL) { rc = FAIL; break; }; | |
2637 | /* check header source of domain against given string */ | |
2638 | switch (dk_verify_block->address_source) { | |
2639 | case DK_EXIM_ADDRESS_FROM_FROM: | |
2640 | rc = match_isinlist(US"from", &arg, 0, NULL, | |
2641 | NULL, MCL_STRING, TRUE, NULL); | |
2642 | break; | |
2643 | case DK_EXIM_ADDRESS_FROM_SENDER: | |
2644 | rc = match_isinlist(US"sender", &arg, 0, NULL, | |
2645 | NULL, MCL_STRING, TRUE, NULL); | |
2646 | break; | |
2647 | case DK_EXIM_ADDRESS_NONE: | |
2648 | rc = match_isinlist(US"none", &arg, 0, NULL, | |
2649 | NULL, MCL_STRING, TRUE, NULL); | |
2650 | break; | |
2651 | } | |
2652 | break; | |
2653 | case ACLC_DK_POLICY: | |
2654 | if (dk_verify_block == NULL) { rc = FAIL; break; }; | |
2655 | /* check policy against given string, default FAIL */ | |
2656 | rc = FAIL; | |
2657 | if (dk_verify_block->signsall) | |
2658 | rc = match_isinlist(US"signsall", &arg, 0, NULL, | |
2659 | NULL, MCL_STRING, TRUE, NULL); | |
2660 | if (dk_verify_block->testing) | |
2661 | rc = match_isinlist(US"testing", &arg, 0, NULL, | |
2662 | NULL, MCL_STRING, TRUE, NULL); | |
2663 | break; | |
2664 | case ACLC_DK_SENDER_DOMAINS: | |
2665 | if (dk_verify_block == NULL) { rc = FAIL; break; }; | |
2666 | if (dk_verify_block->domain != NULL) | |
2667 | rc = match_isinlist(dk_verify_block->domain, &arg, 0, &domainlist_anchor, | |
2668 | NULL, MCL_DOMAIN, TRUE, NULL); | |
2669 | else rc = FAIL; | |
2670 | break; | |
2671 | case ACLC_DK_SENDER_LOCAL_PARTS: | |
2672 | if (dk_verify_block == NULL) { rc = FAIL; break; }; | |
2673 | if (dk_verify_block->local_part != NULL) | |
2674 | rc = match_isinlist(dk_verify_block->local_part, &arg, 0, &localpartlist_anchor, | |
2675 | NULL, MCL_LOCALPART, TRUE, NULL); | |
2676 | else rc = FAIL; | |
2677 | break; | |
2678 | case ACLC_DK_SENDERS: | |
2679 | if (dk_verify_block == NULL) { rc = FAIL; break; }; | |
2680 | if (dk_verify_block->address != NULL) | |
2681 | rc = match_address_list(dk_verify_block->address, TRUE, TRUE, &arg, NULL, -1, 0, NULL); | |
2682 | else rc = FAIL; | |
2683 | break; | |
2684 | case ACLC_DK_STATUS: | |
2685 | if (dk_verify_block == NULL) { rc = FAIL; break; }; | |
2686 | if (dk_verify_block->result > 0) { | |
2687 | switch(dk_verify_block->result) { | |
2688 | case DK_EXIM_RESULT_BAD_FORMAT: | |
2689 | rc = match_isinlist(US"bad format", &arg, 0, NULL, | |
2690 | NULL, MCL_STRING, TRUE, NULL); | |
2691 | break; | |
2692 | case DK_EXIM_RESULT_NO_KEY: | |
2693 | rc = match_isinlist(US"no key", &arg, 0, NULL, | |
2694 | NULL, MCL_STRING, TRUE, NULL); | |
2695 | break; | |
2696 | case DK_EXIM_RESULT_NO_SIGNATURE: | |
2697 | rc = match_isinlist(US"no signature", &arg, 0, NULL, | |
2698 | NULL, MCL_STRING, TRUE, NULL); | |
2699 | break; | |
2700 | case DK_EXIM_RESULT_REVOKED: | |
2701 | rc = match_isinlist(US"revoked", &arg, 0, NULL, | |
2702 | NULL, MCL_STRING, TRUE, NULL); | |
2703 | break; | |
2704 | case DK_EXIM_RESULT_NON_PARTICIPANT: | |
2705 | rc = match_isinlist(US"non-participant", &arg, 0, NULL, | |
2706 | NULL, MCL_STRING, TRUE, NULL); | |
2707 | break; | |
2708 | case DK_EXIM_RESULT_GOOD: | |
2709 | rc = match_isinlist(US"good", &arg, 0, NULL, | |
2710 | NULL, MCL_STRING, TRUE, NULL); | |
2711 | break; | |
2712 | case DK_EXIM_RESULT_BAD: | |
2713 | rc = match_isinlist(US"bad", &arg, 0, NULL, | |
2714 | NULL, MCL_STRING, TRUE, NULL); | |
2715 | break; | |
2716 | } | |
2717 | } | |
2718 | break; | |
2719 | #endif | |
2720 | ||
059ec3d9 PH |
2721 | case ACLC_DNSLISTS: |
2722 | rc = verify_check_dnsbl(&arg); | |
2723 | break; | |
2724 | ||
2725 | case ACLC_DOMAINS: | |
2726 | rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor, | |
2727 | addr->domain_cache, MCL_DOMAIN, TRUE, &deliver_domain_data); | |
2728 | break; | |
2729 | ||
2730 | /* The value in tls_cipher is the full cipher name, for example, | |
2731 | TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the | |
2732 | cipher names such as DES-CBC3-SHA. But program defensively. We don't know | |
2733 | what may in practice come out of the SSL library - which at the time of | |
2734 | writing is poorly documented. */ | |
2735 | ||
2736 | case ACLC_ENCRYPTED: | |
2737 | if (tls_cipher == NULL) rc = FAIL; else | |
2738 | { | |
2739 | uschar *endcipher = NULL; | |
2740 | uschar *cipher = Ustrchr(tls_cipher, ':'); | |
2741 | if (cipher == NULL) cipher = tls_cipher; else | |
2742 | { | |
2743 | endcipher = Ustrchr(++cipher, ':'); | |
2744 | if (endcipher != NULL) *endcipher = 0; | |
2745 | } | |
2746 | rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL); | |
2747 | if (endcipher != NULL) *endcipher = ':'; | |
2748 | } | |
2749 | break; | |
2750 | ||
2751 | /* Use verify_check_this_host() instead of verify_check_host() so that | |
2752 | we can pass over &host_data to catch any looked up data. Once it has been | |
2753 | set, it retains its value so that it's still there if another ACL verb | |
2754 | comes through here and uses the cache. However, we must put it into | |
2755 | permanent store in case it is also expected to be used in a subsequent | |
2756 | message in the same SMTP connection. */ | |
2757 | ||
2758 | case ACLC_HOSTS: | |
2759 | rc = verify_check_this_host(&arg, sender_host_cache, NULL, | |
2760 | (sender_host_address == NULL)? US"" : sender_host_address, &host_data); | |
2761 | if (host_data != NULL) host_data = string_copy_malloc(host_data); | |
2762 | break; | |
2763 | ||
2764 | case ACLC_LOCAL_PARTS: | |
2765 | rc = match_isinlist(addr->cc_local_part, &arg, 0, | |
2766 | &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE, | |
2767 | &deliver_localpart_data); | |
2768 | break; | |
2769 | ||
2770 | case ACLC_LOGWRITE: | |
2771 | { | |
2772 | int logbits = 0; | |
2773 | uschar *s = arg; | |
2774 | if (*s == ':') | |
2775 | { | |
2776 | s++; | |
2777 | while (*s != ':') | |
2778 | { | |
2779 | if (Ustrncmp(s, "main", 4) == 0) | |
2780 | { logbits |= LOG_MAIN; s += 4; } | |
2781 | else if (Ustrncmp(s, "panic", 5) == 0) | |
2782 | { logbits |= LOG_PANIC; s += 5; } | |
2783 | else if (Ustrncmp(s, "reject", 6) == 0) | |
2784 | { logbits |= LOG_REJECT; s += 6; } | |
2785 | else | |
2786 | { | |
2787 | logbits = LOG_MAIN|LOG_PANIC; | |
2788 | s = string_sprintf(":unknown log name in \"%s\" in " | |
2789 | "\"logwrite\" in %s ACL", arg, acl_wherenames[where]); | |
2790 | } | |
2791 | if (*s == ',') s++; | |
2792 | } | |
2793 | s++; | |
2794 | } | |
2795 | while (isspace(*s)) s++; | |
2796 | if (logbits == 0) logbits = LOG_MAIN; | |
2797 | log_write(0, logbits, "%s", string_printing(s)); | |
2798 | } | |
2799 | break; | |
8e669ac1 | 2800 | |
8523533c TK |
2801 | #ifdef WITH_CONTENT_SCAN |
2802 | case ACLC_MALWARE: | |
2803 | { | |
2804 | /* Seperate the regular expression and any optional parameters. */ | |
2805 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); | |
2806 | /* Run the malware backend. */ | |
2807 | rc = malware(&ss); | |
2808 | /* Modify return code based upon the existance of options. */ | |
2809 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2810 | != NULL) { | |
2811 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
2812 | { | |
2813 | /* FAIL so that the message is passed to the next ACL */ | |
2814 | rc = FAIL; | |
2815 | } | |
2816 | } | |
2817 | } | |
2818 | break; | |
2819 | ||
2820 | case ACLC_MIME_REGEX: | |
2821 | rc = mime_regex(&arg); | |
2822 | break; | |
2823 | #endif | |
059ec3d9 | 2824 | |
870f6ba8 TF |
2825 | case ACLC_RATELIMIT: |
2826 | rc = acl_ratelimit(arg, log_msgptr); | |
2827 | break; | |
2828 | ||
059ec3d9 PH |
2829 | case ACLC_RECIPIENTS: |
2830 | rc = match_address_list(addr->address, TRUE, TRUE, &arg, NULL, -1, 0, | |
2831 | &recipient_data); | |
2832 | break; | |
2833 | ||
8523533c TK |
2834 | #ifdef WITH_CONTENT_SCAN |
2835 | case ACLC_REGEX: | |
2836 | rc = regex(&arg); | |
2837 | break; | |
2838 | #endif | |
2839 | ||
059ec3d9 PH |
2840 | case ACLC_SENDER_DOMAINS: |
2841 | { | |
2842 | uschar *sdomain; | |
2843 | sdomain = Ustrrchr(sender_address, '@'); | |
2844 | sdomain = (sdomain == NULL)? US"" : sdomain + 1; | |
2845 | rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor, | |
2846 | sender_domain_cache, MCL_DOMAIN, TRUE, NULL); | |
2847 | } | |
2848 | break; | |
2849 | ||
2850 | case ACLC_SENDERS: | |
2851 | rc = match_address_list(sender_address, TRUE, TRUE, &arg, | |
2852 | sender_address_cache, -1, 0, &sender_data); | |
2853 | break; | |
2854 | ||
2855 | /* Connection variables must persist forever */ | |
2856 | ||
2857 | case ACLC_SET: | |
2858 | { | |
2859 | int old_pool = store_pool; | |
47ca6d6c | 2860 | if (cb->u.varnumber < ACL_CVARS) store_pool = POOL_PERM; |
059ec3d9 PH |
2861 | acl_var[cb->u.varnumber] = string_copy(arg); |
2862 | store_pool = old_pool; | |
2863 | } | |
2864 | break; | |
2865 | ||
8523533c TK |
2866 | #ifdef WITH_CONTENT_SCAN |
2867 | case ACLC_SPAM: | |
2868 | { | |
2869 | /* Seperate the regular expression and any optional parameters. */ | |
2870 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); | |
2871 | /* Run the spam backend. */ | |
2872 | rc = spam(&ss); | |
2873 | /* Modify return code based upon the existance of options. */ | |
2874 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2875 | != NULL) { | |
2876 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
2877 | { | |
2878 | /* FAIL so that the message is passed to the next ACL */ | |
2879 | rc = FAIL; | |
2880 | } | |
2881 | } | |
2882 | } | |
2883 | break; | |
2884 | #endif | |
2885 | ||
2886 | #ifdef EXPERIMENTAL_SPF | |
2887 | case ACLC_SPF: | |
2888 | rc = spf_process(&arg, sender_address); | |
2889 | break; | |
2890 | #endif | |
2891 | ||
059ec3d9 PH |
2892 | /* If the verb is WARN, discard any user message from verification, because |
2893 | such messages are SMTP responses, not header additions. The latter come | |
475fe28a PH |
2894 | only from explicit "message" modifiers. However, put the user message into |
2895 | $acl_verify_message so it can be used in subsequent conditions or modifiers | |
2896 | (until something changes it). */ | |
059ec3d9 PH |
2897 | |
2898 | case ACLC_VERIFY: | |
2899 | rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno); | |
475fe28a | 2900 | acl_verify_message = *user_msgptr; |
059ec3d9 PH |
2901 | if (verb == ACL_WARN) *user_msgptr = NULL; |
2902 | break; | |
2903 | ||
2904 | default: | |
2905 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown " | |
2906 | "condition %d", cb->type); | |
2907 | break; | |
2908 | } | |
2909 | ||
2910 | /* If a condition was negated, invert OK/FAIL. */ | |
2911 | ||
2912 | if (!cond_modifiers[cb->type] && cb->u.negated) | |
2913 | { | |
2914 | if (rc == OK) rc = FAIL; | |
2915 | else if (rc == FAIL || rc == FAIL_DROP) rc = OK; | |
2916 | } | |
2917 | ||
2918 | if (rc != OK) break; /* Conditions loop */ | |
2919 | } | |
2920 | ||
2921 | ||
2922 | /* If the result is the one for which "message" and/or "log_message" are used, | |
2923 | handle the values of these options. Most verbs have but a single return for | |
2924 | which the messages are relevant, but for "discard", it's useful to have the log | |
2925 | message both when it succeeds and when it fails. Also, for an "accept" that | |
2926 | appears in a QUIT ACL, we want to handle the user message. Since only "accept" | |
2927 | and "warn" are permitted in that ACL, we don't need to test the verb. | |
2928 | ||
2929 | These modifiers act in different ways: | |
2930 | ||
2931 | "message" is a user message that will be included in an SMTP response. Unless | |
2932 | it is empty, it overrides any previously set user message. | |
2933 | ||
2934 | "log_message" is a non-user message, and it adds to any existing non-user | |
2935 | message that is already set. | |
2936 | ||
2937 | If there isn't a log message set, we make it the same as the user message. */ | |
2938 | ||
2939 | if (((rc == FAIL_DROP)? FAIL : rc) == msgcond[verb] || | |
2940 | (verb == ACL_DISCARD && rc == OK) || | |
2941 | (where == ACL_WHERE_QUIT)) | |
2942 | { | |
2943 | uschar *expmessage; | |
2944 | ||
2945 | /* If the verb is "warn", messages generated by conditions (verification or | |
2946 | nested ACLs) are discarded. Only messages specified at this level are used. | |
2947 | However, the value of an existing message is available in $acl_verify_message | |
2948 | during expansions. */ | |
2949 | ||
2950 | uschar *old_user_msgptr = *user_msgptr; | |
2951 | uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr; | |
2952 | ||
2953 | if (verb == ACL_WARN) *log_msgptr = *user_msgptr = NULL; | |
2954 | ||
2955 | if (user_message != NULL) | |
2956 | { | |
2957 | acl_verify_message = old_user_msgptr; | |
2958 | expmessage = expand_string(user_message); | |
2959 | if (expmessage == NULL) | |
2960 | { | |
2961 | if (!expand_string_forcedfail) | |
2962 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
2963 | user_message, expand_string_message); | |
2964 | } | |
2965 | else if (expmessage[0] != 0) *user_msgptr = expmessage; | |
2966 | } | |
2967 | ||
2968 | if (log_message != NULL) | |
2969 | { | |
2970 | acl_verify_message = old_log_msgptr; | |
2971 | expmessage = expand_string(log_message); | |
2972 | if (expmessage == NULL) | |
2973 | { | |
2974 | if (!expand_string_forcedfail) | |
2975 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
2976 | log_message, expand_string_message); | |
2977 | } | |
2978 | else if (expmessage[0] != 0) | |
2979 | { | |
2980 | *log_msgptr = (*log_msgptr == NULL)? expmessage : | |
2981 | string_sprintf("%s: %s", expmessage, *log_msgptr); | |
2982 | } | |
2983 | } | |
2984 | ||
2985 | /* If no log message, default it to the user message */ | |
2986 | ||
2987 | if (*log_msgptr == NULL) *log_msgptr = *user_msgptr; | |
2988 | } | |
2989 | ||
2990 | acl_verify_message = NULL; | |
2991 | return rc; | |
2992 | } | |
2993 | ||
2994 | ||
2995 | ||
2996 | ||
2997 | ||
2998 | /************************************************* | |
2999 | * Get line from a literal ACL * | |
3000 | *************************************************/ | |
3001 | ||
3002 | /* This function is passed to acl_read() in order to extract individual lines | |
3003 | of a literal ACL, which we access via static pointers. We can destroy the | |
3004 | contents because this is called only once (the compiled ACL is remembered). | |
3005 | ||
3006 | This code is intended to treat the data in the same way as lines in the main | |
3007 | Exim configuration file. That is: | |
3008 | ||
3009 | . Leading spaces are ignored. | |
3010 | ||
3011 | . A \ at the end of a line is a continuation - trailing spaces after the \ | |
3012 | are permitted (this is because I don't believe in making invisible things | |
3013 | significant). Leading spaces on the continued part of a line are ignored. | |
3014 | ||
3015 | . Physical lines starting (significantly) with # are totally ignored, and | |
3016 | may appear within a sequence of backslash-continued lines. | |
3017 | ||
3018 | . Blank lines are ignored, but will end a sequence of continuations. | |
3019 | ||
3020 | Arguments: none | |
3021 | Returns: a pointer to the next line | |
3022 | */ | |
3023 | ||
3024 | ||
3025 | static uschar *acl_text; /* Current pointer in the text */ | |
3026 | static uschar *acl_text_end; /* Points one past the terminating '0' */ | |
3027 | ||
3028 | ||
3029 | static uschar * | |
3030 | acl_getline(void) | |
3031 | { | |
3032 | uschar *yield; | |
3033 | ||
3034 | /* This loop handles leading blank lines and comments. */ | |
3035 | ||
3036 | for(;;) | |
3037 | { | |
3038 | while (isspace(*acl_text)) acl_text++; /* Leading spaces/empty lines */ | |
3039 | if (*acl_text == 0) return NULL; /* No more data */ | |
3040 | yield = acl_text; /* Potential data line */ | |
3041 | ||
3042 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3043 | ||
3044 | /* If we hit the end before a newline, we have the whole logical line. If | |
3045 | it's a comment, there's no more data to be given. Otherwise, yield it. */ | |
3046 | ||
3047 | if (*acl_text == 0) return (*yield == '#')? NULL : yield; | |
3048 | ||
3049 | /* After reaching a newline, end this loop if the physical line does not | |
3050 | start with '#'. If it does, it's a comment, and the loop continues. */ | |
3051 | ||
3052 | if (*yield != '#') break; | |
3053 | } | |
3054 | ||
3055 | /* This loop handles continuations. We know we have some real data, ending in | |
3056 | newline. See if there is a continuation marker at the end (ignoring trailing | |
3057 | white space). We know that *yield is not white space, so no need to test for | |
3058 | cont > yield in the backwards scanning loop. */ | |
3059 | ||
3060 | for(;;) | |
3061 | { | |
3062 | uschar *cont; | |
3063 | for (cont = acl_text - 1; isspace(*cont); cont--); | |
3064 | ||
3065 | /* If no continuation follows, we are done. Mark the end of the line and | |
3066 | return it. */ | |
3067 | ||
3068 | if (*cont != '\\') | |
3069 | { | |
3070 | *acl_text++ = 0; | |
3071 | return yield; | |
3072 | } | |
3073 | ||
3074 | /* We have encountered a continuation. Skip over whitespace at the start of | |
3075 | the next line, and indeed the whole of the next line or lines if they are | |
3076 | comment lines. */ | |
3077 | ||
3078 | for (;;) | |
3079 | { | |
3080 | while (*(++acl_text) == ' ' || *acl_text == '\t'); | |
3081 | if (*acl_text != '#') break; | |
3082 | while (*(++acl_text) != 0 && *acl_text != '\n'); | |
3083 | } | |
3084 | ||
3085 | /* We have the start of a continuation line. Move all the rest of the data | |
3086 | to join onto the previous line, and then find its end. If the end is not a | |
3087 | newline, we are done. Otherwise loop to look for another continuation. */ | |
3088 | ||
3089 | memmove(cont, acl_text, acl_text_end - acl_text); | |
3090 | acl_text_end -= acl_text - cont; | |
3091 | acl_text = cont; | |
3092 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3093 | if (*acl_text == 0) return yield; | |
3094 | } | |
3095 | ||
3096 | /* Control does not reach here */ | |
3097 | } | |
3098 | ||
3099 | ||
3100 | ||
3101 | ||
3102 | ||
3103 | /************************************************* | |
3104 | * Check access using an ACL * | |
3105 | *************************************************/ | |
3106 | ||
3107 | /* This function is called from address_check. It may recurse via | |
3108 | acl_check_condition() - hence the use of a level to stop looping. The ACL is | |
3109 | passed as a string which is expanded. A forced failure implies no access check | |
3110 | is required. If the result is a single word, it is taken as the name of an ACL | |
3111 | which is sought in the global ACL tree. Otherwise, it is taken as literal ACL | |
3112 | text, complete with newlines, and parsed as such. In both cases, the ACL check | |
3113 | is then run. This function uses an auxiliary function for acl_read() to call | |
3114 | for reading individual lines of a literal ACL. This is acl_getline(), which | |
3115 | appears immediately above. | |
3116 | ||
3117 | Arguments: | |
3118 | where where called from | |
3119 | addr address item when called from RCPT; otherwise NULL | |
3120 | s the input string; NULL is the same as an empty ACL => DENY | |
3121 | level the nesting level | |
3122 | user_msgptr where to put a user error (for SMTP response) | |
3123 | log_msgptr where to put a logging message (not for SMTP response) | |
3124 | ||
3125 | Returns: OK access is granted | |
3126 | DISCARD access is apparently granted... | |
3127 | FAIL access is denied | |
3128 | FAIL_DROP access is denied; drop the connection | |
3129 | DEFER can't tell at the moment | |
3130 | ERROR disaster | |
3131 | */ | |
3132 | ||
3133 | static int | |
3134 | acl_check_internal(int where, address_item *addr, uschar *s, int level, | |
3135 | uschar **user_msgptr, uschar **log_msgptr) | |
3136 | { | |
3137 | int fd = -1; | |
3138 | acl_block *acl = NULL; | |
3139 | uschar *acl_name = US"inline ACL"; | |
3140 | uschar *ss; | |
3141 | ||
3142 | /* Catch configuration loops */ | |
3143 | ||
3144 | if (level > 20) | |
3145 | { | |
3146 | *log_msgptr = US"ACL nested too deep: possible loop"; | |
3147 | return ERROR; | |
3148 | } | |
3149 | ||
3150 | if (s == NULL) | |
3151 | { | |
3152 | HDEBUG(D_acl) debug_printf("ACL is NULL: implicit DENY\n"); | |
3153 | return FAIL; | |
3154 | } | |
3155 | ||
3156 | /* At top level, we expand the incoming string. At lower levels, it has already | |
3157 | been expanded as part of condition processing. */ | |
3158 | ||
3159 | if (level == 0) | |
3160 | { | |
3161 | ss = expand_string(s); | |
3162 | if (ss == NULL) | |
3163 | { | |
3164 | if (expand_string_forcedfail) return OK; | |
3165 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s, | |
3166 | expand_string_message); | |
3167 | return ERROR; | |
3168 | } | |
3169 | } | |
3170 | else ss = s; | |
3171 | ||
3172 | while (isspace(*ss))ss++; | |
3173 | ||
3174 | /* If we can't find a named ACL, the default is to parse it as an inline one. | |
3175 | (Unless it begins with a slash; non-existent files give rise to an error.) */ | |
3176 | ||
3177 | acl_text = ss; | |
3178 | ||
3179 | /* Handle the case of a string that does not contain any spaces. Look for a | |
3180 | named ACL among those read from the configuration, or a previously read file. | |
3181 | It is possible that the pointer to the ACL is NULL if the configuration | |
3182 | contains a name with no data. If not found, and the text begins with '/', | |
3183 | read an ACL from a file, and save it so it can be re-used. */ | |
3184 | ||
3185 | if (Ustrchr(ss, ' ') == NULL) | |
3186 | { | |
3187 | tree_node *t = tree_search(acl_anchor, ss); | |
3188 | if (t != NULL) | |
3189 | { | |
3190 | acl = (acl_block *)(t->data.ptr); | |
3191 | if (acl == NULL) | |
3192 | { | |
3193 | HDEBUG(D_acl) debug_printf("ACL \"%s\" is empty: implicit DENY\n", ss); | |
3194 | return FAIL; | |
3195 | } | |
3196 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
3197 | HDEBUG(D_acl) debug_printf("using ACL \"%s\"\n", ss); | |
3198 | } | |
3199 | ||
3200 | else if (*ss == '/') | |
3201 | { | |
3202 | struct stat statbuf; | |
3203 | fd = Uopen(ss, O_RDONLY, 0); | |
3204 | if (fd < 0) | |
3205 | { | |
3206 | *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss, | |
3207 | strerror(errno)); | |
3208 | return ERROR; | |
3209 | } | |
3210 | ||
3211 | if (fstat(fd, &statbuf) != 0) | |
3212 | { | |
3213 | *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss, | |
3214 | strerror(errno)); | |
3215 | return ERROR; | |
3216 | } | |
3217 | ||
3218 | acl_text = store_get(statbuf.st_size + 1); | |
3219 | acl_text_end = acl_text + statbuf.st_size + 1; | |
3220 | ||
3221 | if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size) | |
3222 | { | |
3223 | *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s", | |
3224 | ss, strerror(errno)); | |
3225 | return ERROR; | |
3226 | } | |
3227 | acl_text[statbuf.st_size] = 0; | |
f1e894f3 | 3228 | (void)close(fd); |
059ec3d9 PH |
3229 | |
3230 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
3231 | HDEBUG(D_acl) debug_printf("read ACL from file %s\n", ss); | |
3232 | } | |
3233 | } | |
3234 | ||
3235 | /* Parse an ACL that is still in text form. If it came from a file, remember it | |
3236 | in the ACL tree, having read it into the POOL_PERM store pool so that it | |
3237 | persists between multiple messages. */ | |
3238 | ||
3239 | if (acl == NULL) | |
3240 | { | |
3241 | int old_pool = store_pool; | |
3242 | if (fd >= 0) store_pool = POOL_PERM; | |
3243 | acl = acl_read(acl_getline, log_msgptr); | |
3244 | store_pool = old_pool; | |
3245 | if (acl == NULL && *log_msgptr != NULL) return ERROR; | |
3246 | if (fd >= 0) | |
3247 | { | |
3248 | tree_node *t = store_get_perm(sizeof(tree_node) + Ustrlen(ss)); | |
3249 | Ustrcpy(t->name, ss); | |
3250 | t->data.ptr = acl; | |
3251 | (void)tree_insertnode(&acl_anchor, t); | |
3252 | } | |
3253 | } | |
3254 | ||
3255 | /* Now we have an ACL to use. It's possible it may be NULL. */ | |
3256 | ||
3257 | while (acl != NULL) | |
3258 | { | |
3259 | int cond; | |
3260 | int basic_errno = 0; | |
3261 | BOOL endpass_seen = FALSE; | |
3262 | ||
3263 | *log_msgptr = *user_msgptr = NULL; | |
3264 | acl_temp_details = FALSE; | |
3265 | ||
3266 | if (where == ACL_WHERE_QUIT && | |
3267 | acl->verb != ACL_ACCEPT && | |
3268 | acl->verb != ACL_WARN) | |
3269 | { | |
3270 | *log_msgptr = string_sprintf("\"%s\" is not allowed in a QUIT ACL", | |
3271 | verbs[acl->verb]); | |
3272 | return ERROR; | |
3273 | } | |
3274 | ||
3275 | HDEBUG(D_acl) debug_printf("processing \"%s\"\n", verbs[acl->verb]); | |
3276 | ||
3277 | /* Clear out any search error message from a previous check before testing | |
3278 | this condition. */ | |
3279 | ||
3280 | search_error_message = NULL; | |
3281 | cond = acl_check_condition(acl->verb, acl->condition, where, addr, level, | |
3282 | &endpass_seen, user_msgptr, log_msgptr, &basic_errno); | |
3283 | ||
3284 | /* Handle special returns: DEFER causes a return except on a WARN verb; | |
3285 | ERROR always causes a return. */ | |
3286 | ||
3287 | switch (cond) | |
3288 | { | |
3289 | case DEFER: | |
3290 | HDEBUG(D_acl) debug_printf("%s: condition test deferred\n", verbs[acl->verb]); | |
3291 | if (basic_errno != ERRNO_CALLOUTDEFER) | |
3292 | { | |
3293 | if (search_error_message != NULL && *search_error_message != 0) | |
3294 | *log_msgptr = search_error_message; | |
3295 | if (smtp_return_error_details) acl_temp_details = TRUE; | |
3296 | } | |
3297 | else | |
3298 | { | |
3299 | acl_temp_details = TRUE; | |
3300 | } | |
3301 | if (acl->verb != ACL_WARN) return DEFER; | |
3302 | break; | |
3303 | ||
3304 | default: /* Paranoia */ | |
3305 | case ERROR: | |
3306 | HDEBUG(D_acl) debug_printf("%s: condition test error\n", verbs[acl->verb]); | |
3307 | return ERROR; | |
3308 | ||
3309 | case OK: | |
3310 | HDEBUG(D_acl) debug_printf("%s: condition test succeeded\n", | |
3311 | verbs[acl->verb]); | |
3312 | break; | |
3313 | ||
3314 | case FAIL: | |
3315 | HDEBUG(D_acl) debug_printf("%s: condition test failed\n", verbs[acl->verb]); | |
3316 | break; | |
3317 | ||
3318 | /* DISCARD and DROP can happen only from a nested ACL condition, and | |
3319 | DISCARD can happen only for an "accept" or "discard" verb. */ | |
3320 | ||
3321 | case DISCARD: | |
3322 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"discard\"\n", | |
3323 | verbs[acl->verb]); | |
3324 | break; | |
3325 | ||
3326 | case FAIL_DROP: | |
3327 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"drop\"\n", | |
3328 | verbs[acl->verb]); | |
3329 | break; | |
3330 | } | |
3331 | ||
3332 | /* At this point, cond for most verbs is either OK or FAIL or (as a result of | |
3333 | a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and | |
3334 | for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */ | |
3335 | ||
3336 | switch(acl->verb) | |
3337 | { | |
3338 | case ACL_ACCEPT: | |
3339 | if (cond == OK || cond == DISCARD) return cond; | |
3340 | if (endpass_seen) | |
3341 | { | |
3342 | HDEBUG(D_acl) debug_printf("accept: endpass encountered - denying access\n"); | |
3343 | return cond; | |
3344 | } | |
3345 | break; | |
3346 | ||
3347 | case ACL_DEFER: | |
3348 | if (cond == OK) | |
3349 | { | |
3350 | acl_temp_details = TRUE; | |
3351 | return DEFER; | |
3352 | } | |
3353 | break; | |
3354 | ||
3355 | case ACL_DENY: | |
3356 | if (cond == OK) return FAIL; | |
3357 | break; | |
3358 | ||
3359 | case ACL_DISCARD: | |
3360 | if (cond == OK || cond == DISCARD) return DISCARD; | |
3361 | if (endpass_seen) | |
3362 | { | |
3363 | HDEBUG(D_acl) debug_printf("discard: endpass encountered - denying access\n"); | |
3364 | return cond; | |
3365 | } | |
3366 | break; | |
3367 | ||
3368 | case ACL_DROP: | |
3369 | if (cond == OK) return FAIL_DROP; | |
3370 | break; | |
3371 | ||
3372 | case ACL_REQUIRE: | |
3373 | if (cond != OK) return cond; | |
3374 | break; | |
3375 | ||
3376 | case ACL_WARN: | |
3377 | if (cond == OK) | |
3378 | acl_warn(where, *user_msgptr, *log_msgptr); | |
49826d12 | 3379 | else if (cond == DEFER && (log_extra_selector & LX_acl_warn_skipped) != 0) |
9c7a242c PH |
3380 | log_write(0, LOG_MAIN, "%s Warning: ACL \"warn\" statement skipped: " |
3381 | "condition test deferred%s%s", host_and_ident(TRUE), | |
3382 | (*log_msgptr == NULL)? US"" : US": ", | |
3383 | (*log_msgptr == NULL)? US"" : *log_msgptr); | |
059ec3d9 PH |
3384 | *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */ |
3385 | break; | |
3386 | ||
3387 | default: | |
3388 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d", | |
3389 | acl->verb); | |
3390 | break; | |
3391 | } | |
3392 | ||
3393 | /* Pass to the next ACL item */ | |
3394 | ||
3395 | acl = acl->next; | |
3396 | } | |
3397 | ||
3398 | /* We have reached the end of the ACL. This is an implicit DENY. */ | |
3399 | ||
3400 | HDEBUG(D_acl) debug_printf("end of %s: implicit DENY\n", acl_name); | |
3401 | return FAIL; | |
3402 | } | |
3403 | ||
3404 | ||
3405 | /************************************************* | |
3406 | * Check access using an ACL * | |
3407 | *************************************************/ | |
3408 | ||
3409 | /* This is the external interface for ACL checks. It sets up an address and the | |
3410 | expansions for $domain and $local_part when called after RCPT, then calls | |
3411 | acl_check_internal() to do the actual work. | |
3412 | ||
3413 | Arguments: | |
3414 | where ACL_WHERE_xxxx indicating where called from | |
64ffc24f | 3415 | recipient RCPT address for RCPT check, else NULL |
059ec3d9 PH |
3416 | s the input string; NULL is the same as an empty ACL => DENY |
3417 | user_msgptr where to put a user error (for SMTP response) | |
3418 | log_msgptr where to put a logging message (not for SMTP response) | |
3419 | ||
3420 | Returns: OK access is granted by an ACCEPT verb | |
3421 | DISCARD access is granted by a DISCARD verb | |
3422 | FAIL access is denied | |
3423 | FAIL_DROP access is denied; drop the connection | |
3424 | DEFER can't tell at the moment | |
3425 | ERROR disaster | |
3426 | */ | |
3427 | ||
3428 | int | |
64ffc24f | 3429 | acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr, |
059ec3d9 PH |
3430 | uschar **log_msgptr) |
3431 | { | |
3432 | int rc; | |
3433 | address_item adb; | |
64ffc24f | 3434 | address_item *addr = NULL; |
059ec3d9 PH |
3435 | |
3436 | *user_msgptr = *log_msgptr = NULL; | |
3437 | sender_verified_failed = NULL; | |
fe0dab11 | 3438 | ratelimiters_cmd = NULL; |
059ec3d9 PH |
3439 | |
3440 | if (where == ACL_WHERE_RCPT) | |
3441 | { | |
3442 | adb = address_defaults; | |
3443 | addr = &adb; | |
64ffc24f | 3444 | addr->address = recipient; |
059ec3d9 PH |
3445 | if (deliver_split_address(addr) == DEFER) |
3446 | { | |
3447 | *log_msgptr = US"defer in percent_hack_domains check"; | |
3448 | return DEFER; | |
3449 | } | |
3450 | deliver_domain = addr->domain; | |
3451 | deliver_localpart = addr->local_part; | |
3452 | } | |
059ec3d9 PH |
3453 | |
3454 | rc = acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr); | |
3455 | ||
64ffc24f PH |
3456 | deliver_domain = deliver_localpart = deliver_address_data = |
3457 | sender_address_data = NULL; | |
059ec3d9 PH |
3458 | |
3459 | /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA | |
3460 | ACL, which is really in the middle of an SMTP command. */ | |
3461 | ||
3462 | if (rc == DISCARD) | |
3463 | { | |
3464 | if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA) | |
3465 | { | |
3466 | log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s " | |
3467 | "ACL", acl_wherenames[where]); | |
3468 | return ERROR; | |
3469 | } | |
3470 | return DISCARD; | |
3471 | } | |
3472 | ||
3473 | /* A DROP response is not permitted from MAILAUTH */ | |
3474 | ||
3475 | if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH) | |
3476 | { | |
3477 | log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s " | |
3478 | "ACL", acl_wherenames[where]); | |
3479 | return ERROR; | |
3480 | } | |
3481 | ||
3482 | /* Before giving an error response, take a look at the length of any user | |
3483 | message, and split it up into multiple lines if possible. */ | |
3484 | ||
3485 | if (rc != OK && *user_msgptr != NULL && Ustrlen(*user_msgptr) > 75) | |
3486 | { | |
3487 | uschar *s = *user_msgptr = string_copy(*user_msgptr); | |
3488 | uschar *ss = s; | |
3489 | ||
3490 | for (;;) | |
3491 | { | |
3492 | int i = 0; | |
3493 | while (i < 75 && *ss != 0 && *ss != '\n') ss++, i++; | |
3494 | if (*ss == 0) break; | |
3495 | if (*ss == '\n') | |
3496 | s = ++ss; | |
3497 | else | |
3498 | { | |
3499 | uschar *t = ss + 1; | |
3500 | uschar *tt = NULL; | |
3501 | while (--t > s + 35) | |
3502 | { | |
3503 | if (*t == ' ') | |
3504 | { | |
3505 | if (t[-1] == ':') { tt = t; break; } | |
3506 | if (tt == NULL) tt = t; | |
3507 | } | |
3508 | } | |
3509 | ||
3510 | if (tt == NULL) /* Can't split behind - try ahead */ | |
3511 | { | |
3512 | t = ss + 1; | |
3513 | while (*t != 0) | |
3514 | { | |
3515 | if (*t == ' ' || *t == '\n') | |
3516 | { tt = t; break; } | |
3517 | t++; | |
3518 | } | |
3519 | } | |
3520 | ||
3521 | if (tt == NULL) break; /* Can't find anywhere to split */ | |
3522 | *tt = '\n'; | |
3523 | s = ss = tt+1; | |
3524 | } | |
3525 | } | |
3526 | } | |
3527 | ||
3528 | return rc; | |
3529 | } | |
3530 | ||
3531 | /* End of acl.c */ |