Commit | Line | Data |
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2fe1a124 | 1 | /* $Cambridge: exim/src/src/acl.c,v 1.46 2005/09/07 10:15:33 ph10 Exp $ */ |
059ec3d9 PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
c988f1f4 | 7 | /* Copyright (c) University of Cambridge 1995 - 2005 */ |
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 { | |
135 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
136 | CONTROL_BMI_RUN, | |
137 | #endif | |
138 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
139 | CONTROL_DK_VERIFY, | |
140 | #endif | |
141 | CONTROL_ERROR, CONTROL_CASEFUL_LOCAL_PART, CONTROL_CASELOWER_LOCAL_PART, | |
142 | CONTROL_ENFORCE_SYNC, CONTROL_NO_ENFORCE_SYNC, CONTROL_FREEZE, | |
143 | CONTROL_QUEUE_ONLY, CONTROL_SUBMISSION, | |
144 | #ifdef WITH_CONTENT_SCAN | |
145 | CONTROL_NO_MBOX_UNSPOOL, | |
146 | #endif | |
147 | CONTROL_FAKEDEFER, CONTROL_FAKEREJECT, CONTROL_NO_MULTILINE }; | |
148 | ||
149 | /* ACL control names; keep in step with the table above! */ | |
150 | ||
151 | static uschar *controls[] = { | |
152 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
153 | US"bmi_run", | |
154 | #endif | |
155 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
156 | US"dk_verify", | |
157 | #endif | |
158 | US"error", US"caseful_local_part", | |
c5fcb476 | 159 | US"caselower_local_part", US"enforce_sync", US"no_enforce_sync", US"freeze", |
9a26b6b2 PH |
160 | US"queue_only", US"submission", |
161 | #ifdef WITH_CONTENT_SCAN | |
162 | US"no_mbox_unspool", | |
163 | #endif | |
164 | US"no_multiline"}; | |
059ec3d9 PH |
165 | |
166 | /* Flags to indicate for which conditions /modifiers a string expansion is done | |
167 | at the outer level. In the other cases, expansion already occurs in the | |
168 | checking functions. */ | |
169 | ||
170 | static uschar cond_expand_at_top[] = { | |
171 | TRUE, /* acl */ | |
172 | FALSE, /* authenticated */ | |
8523533c TK |
173 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
174 | TRUE, /* bmi_optin */ | |
8e669ac1 | 175 | #endif |
059ec3d9 PH |
176 | TRUE, /* condition */ |
177 | TRUE, /* control */ | |
8523533c TK |
178 | #ifdef WITH_CONTENT_SCAN |
179 | TRUE, /* decode */ | |
180 | #endif | |
059ec3d9 | 181 | TRUE, /* delay */ |
8523533c TK |
182 | #ifdef WITH_OLD_DEMIME |
183 | TRUE, /* demime */ | |
fb2274d4 TK |
184 | #endif |
185 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
7f45268c PH |
186 | TRUE, /* dk_domain_source */ |
187 | TRUE, /* dk_policy */ | |
188 | TRUE, /* dk_sender_domains */ | |
e715ad22 | 189 | TRUE, /* dk_sender_local_parts */ |
7f45268c PH |
190 | TRUE, /* dk_senders */ |
191 | TRUE, /* dk_status */ | |
8523533c | 192 | #endif |
059ec3d9 PH |
193 | TRUE, /* dnslists */ |
194 | FALSE, /* domains */ | |
195 | FALSE, /* encrypted */ | |
196 | TRUE, /* endpass */ | |
197 | FALSE, /* hosts */ | |
198 | FALSE, /* local_parts */ | |
199 | TRUE, /* log_message */ | |
200 | TRUE, /* logwrite */ | |
8523533c TK |
201 | #ifdef WITH_CONTENT_SCAN |
202 | TRUE, /* malware */ | |
203 | #endif | |
059ec3d9 | 204 | TRUE, /* message */ |
8523533c TK |
205 | #ifdef WITH_CONTENT_SCAN |
206 | TRUE, /* mime_regex */ | |
207 | #endif | |
870f6ba8 | 208 | TRUE, /* ratelimit */ |
059ec3d9 | 209 | FALSE, /* recipients */ |
8523533c TK |
210 | #ifdef WITH_CONTENT_SCAN |
211 | TRUE, /* regex */ | |
212 | #endif | |
059ec3d9 PH |
213 | FALSE, /* sender_domains */ |
214 | FALSE, /* senders */ | |
215 | TRUE, /* set */ | |
8523533c TK |
216 | #ifdef WITH_CONTENT_SCAN |
217 | TRUE, /* spam */ | |
218 | #endif | |
219 | #ifdef EXPERIMENTAL_SPF | |
220 | TRUE, /* spf */ | |
221 | #endif | |
059ec3d9 PH |
222 | TRUE /* verify */ |
223 | }; | |
224 | ||
225 | /* Flags to identify the modifiers */ | |
226 | ||
227 | static uschar cond_modifiers[] = { | |
228 | FALSE, /* acl */ | |
229 | FALSE, /* authenticated */ | |
8523533c TK |
230 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
231 | TRUE, /* bmi_optin */ | |
8e669ac1 | 232 | #endif |
059ec3d9 PH |
233 | FALSE, /* condition */ |
234 | TRUE, /* control */ | |
8523533c TK |
235 | #ifdef WITH_CONTENT_SCAN |
236 | FALSE, /* decode */ | |
237 | #endif | |
059ec3d9 | 238 | TRUE, /* delay */ |
8523533c TK |
239 | #ifdef WITH_OLD_DEMIME |
240 | FALSE, /* demime */ | |
fb2274d4 TK |
241 | #endif |
242 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
7f45268c PH |
243 | FALSE, /* dk_domain_source */ |
244 | FALSE, /* dk_policy */ | |
245 | FALSE, /* dk_sender_domains */ | |
e715ad22 | 246 | FALSE, /* dk_sender_local_parts */ |
7f45268c PH |
247 | FALSE, /* dk_senders */ |
248 | FALSE, /* dk_status */ | |
8523533c | 249 | #endif |
059ec3d9 PH |
250 | FALSE, /* dnslists */ |
251 | FALSE, /* domains */ | |
252 | FALSE, /* encrypted */ | |
253 | TRUE, /* endpass */ | |
254 | FALSE, /* hosts */ | |
255 | FALSE, /* local_parts */ | |
256 | TRUE, /* log_message */ | |
8523533c TK |
257 | TRUE, /* logwrite */ |
258 | #ifdef WITH_CONTENT_SCAN | |
259 | FALSE, /* malware */ | |
260 | #endif | |
059ec3d9 | 261 | TRUE, /* message */ |
8523533c TK |
262 | #ifdef WITH_CONTENT_SCAN |
263 | FALSE, /* mime_regex */ | |
264 | #endif | |
870f6ba8 | 265 | FALSE, /* ratelimit */ |
059ec3d9 | 266 | FALSE, /* recipients */ |
8523533c TK |
267 | #ifdef WITH_CONTENT_SCAN |
268 | FALSE, /* regex */ | |
269 | #endif | |
059ec3d9 PH |
270 | FALSE, /* sender_domains */ |
271 | FALSE, /* senders */ | |
272 | TRUE, /* set */ | |
8523533c TK |
273 | #ifdef WITH_CONTENT_SCAN |
274 | FALSE, /* spam */ | |
275 | #endif | |
276 | #ifdef EXPERIMENTAL_SPF | |
277 | FALSE, /* spf */ | |
278 | #endif | |
059ec3d9 PH |
279 | FALSE /* verify */ |
280 | }; | |
281 | ||
c5fcb476 | 282 | /* Bit map vector of which conditions are not allowed at certain times. For |
2f079f46 PH |
283 | each condition, there's a bitmap of dis-allowed times. For some, it is easier |
284 | to specify the negation of a small number of allowed times. */ | |
059ec3d9 PH |
285 | |
286 | static unsigned int cond_forbids[] = { | |
287 | 0, /* acl */ | |
8e669ac1 | 288 | |
059ec3d9 PH |
289 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_CONNECT)| /* authenticated */ |
290 | (1<<ACL_WHERE_HELO), | |
8e669ac1 | 291 | |
8523533c | 292 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
3864bb8e | 293 | (1<<ACL_WHERE_AUTH)| /* bmi_optin */ |
8523533c TK |
294 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
295 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_MIME)| | |
8e669ac1 | 296 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
8523533c TK |
297 | (1<<ACL_WHERE_MAILAUTH)| |
298 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
299 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_PREDATA), | |
300 | #endif | |
8e669ac1 | 301 | |
059ec3d9 | 302 | 0, /* condition */ |
8e669ac1 | 303 | |
059ec3d9 | 304 | /* Certain types of control are always allowed, so we let it through |
2f079f46 | 305 | always and check in the control processing itself. */ |
8e669ac1 | 306 | |
059ec3d9 | 307 | 0, /* control */ |
8e669ac1 | 308 | |
8523533c | 309 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
310 | (unsigned int) |
311 | ~(1<<ACL_WHERE_MIME), /* decode */ | |
8523533c TK |
312 | #endif |
313 | ||
059ec3d9 | 314 | 0, /* delay */ |
8e669ac1 | 315 | |
f7b63901 | 316 | #ifdef WITH_OLD_DEMIME |
2f079f46 PH |
317 | (unsigned int) |
318 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* demime */ | |
8523533c | 319 | #endif |
8e669ac1 | 320 | |
fb2274d4 | 321 | #ifdef EXPERIMENTAL_DOMAINKEYS |
2f079f46 | 322 | (1<<ACL_WHERE_AUTH)| /* dk_domain_source */ |
fb2274d4 TK |
323 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
324 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
325 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
326 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
327 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
328 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 329 | |
2f079f46 | 330 | (1<<ACL_WHERE_AUTH)| /* dk_policy */ |
fb2274d4 TK |
331 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
332 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
333 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
334 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
335 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
336 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 337 | |
2f079f46 | 338 | (1<<ACL_WHERE_AUTH)| /* dk_sender_domains */ |
fb2274d4 TK |
339 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
340 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
341 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
342 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
343 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
344 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 345 | |
2f079f46 | 346 | (1<<ACL_WHERE_AUTH)| /* dk_sender_local_parts */ |
fb2274d4 TK |
347 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
348 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
349 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
350 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
351 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
352 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 353 | |
2f079f46 | 354 | (1<<ACL_WHERE_AUTH)| /* dk_senders */ |
fb2274d4 TK |
355 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
356 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
357 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
358 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
359 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
360 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 361 | |
2f079f46 | 362 | (1<<ACL_WHERE_AUTH)| /* dk_status */ |
fb2274d4 TK |
363 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
364 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
365 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
366 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
367 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
368 | (1<<ACL_WHERE_VRFY), | |
369 | #endif | |
370 | ||
059ec3d9 PH |
371 | (1<<ACL_WHERE_NOTSMTP), /* dnslists */ |
372 | ||
2f079f46 PH |
373 | (unsigned int) |
374 | ~(1<<ACL_WHERE_RCPT), /* domains */ | |
059ec3d9 PH |
375 | |
376 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_CONNECT)| /* encrypted */ | |
377 | (1<<ACL_WHERE_HELO), | |
8e669ac1 | 378 | |
059ec3d9 | 379 | 0, /* endpass */ |
8e669ac1 | 380 | |
059ec3d9 PH |
381 | (1<<ACL_WHERE_NOTSMTP), /* hosts */ |
382 | ||
2f079f46 PH |
383 | (unsigned int) |
384 | ~(1<<ACL_WHERE_RCPT), /* local_parts */ | |
059ec3d9 PH |
385 | |
386 | 0, /* log_message */ | |
8e669ac1 | 387 | |
059ec3d9 | 388 | 0, /* logwrite */ |
8e669ac1 | 389 | |
8523533c | 390 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
391 | (unsigned int) |
392 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* malware */ | |
8523533c TK |
393 | #endif |
394 | ||
059ec3d9 PH |
395 | 0, /* message */ |
396 | ||
8523533c | 397 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
398 | (unsigned int) |
399 | ~(1<<ACL_WHERE_MIME), /* mime_regex */ | |
8523533c TK |
400 | #endif |
401 | ||
870f6ba8 TF |
402 | 0, /* ratelimit */ |
403 | ||
2f079f46 PH |
404 | (unsigned int) |
405 | ~(1<<ACL_WHERE_RCPT), /* recipients */ | |
059ec3d9 | 406 | |
8523533c | 407 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
408 | (unsigned int) |
409 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* regex */ | |
410 | (1<<ACL_WHERE_MIME)), | |
8523533c TK |
411 | #endif |
412 | ||
059ec3d9 PH |
413 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* sender_domains */ |
414 | (1<<ACL_WHERE_HELO)| | |
415 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
416 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
417 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
418 | ||
419 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* senders */ | |
420 | (1<<ACL_WHERE_HELO)| | |
421 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
422 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
423 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
424 | ||
425 | 0, /* set */ | |
426 | ||
8523533c | 427 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
428 | (unsigned int) |
429 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* spam */ | |
8523533c TK |
430 | #endif |
431 | ||
432 | #ifdef EXPERIMENTAL_SPF | |
433 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf */ | |
434 | (1<<ACL_WHERE_HELO)| | |
435 | (1<<ACL_WHERE_MAILAUTH)| | |
436 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
437 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
438 | #endif | |
439 | ||
059ec3d9 PH |
440 | /* Certain types of verify are always allowed, so we let it through |
441 | always and check in the verify function itself */ | |
442 | ||
443 | 0 /* verify */ | |
059ec3d9 PH |
444 | }; |
445 | ||
446 | ||
c5fcb476 PH |
447 | /* Bit map vector of which controls are not allowed at certain times. For |
448 | each control, there's a bitmap of dis-allowed times. For some, it is easier to | |
449 | specify the negation of a small number of allowed times. */ | |
450 | ||
451 | static unsigned int control_forbids[] = { | |
8523533c TK |
452 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
453 | 0, /* bmi_run */ | |
454 | #endif | |
fb2274d4 | 455 | #ifdef EXPERIMENTAL_DOMAINKEYS |
e715ad22 | 456 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), /* dk_verify */ |
fb2274d4 | 457 | #endif |
3e11c26b | 458 | |
c5fcb476 | 459 | 0, /* error */ |
8e669ac1 PH |
460 | |
461 | (unsigned int) | |
c5fcb476 | 462 | ~(1<<ACL_WHERE_RCPT), /* caseful_local_part */ |
8e669ac1 PH |
463 | |
464 | (unsigned int) | |
c5fcb476 | 465 | ~(1<<ACL_WHERE_RCPT), /* caselower_local_part */ |
8e669ac1 | 466 | |
c5fcb476 | 467 | (1<<ACL_WHERE_NOTSMTP), /* enforce_sync */ |
8e669ac1 | 468 | |
c5fcb476 | 469 | (1<<ACL_WHERE_NOTSMTP), /* no_enforce_sync */ |
8e669ac1 PH |
470 | |
471 | (unsigned int) | |
c5fcb476 PH |
472 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* freeze */ |
473 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
e715ad22 | 474 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
475 | |
476 | (unsigned int) | |
c5fcb476 PH |
477 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* queue_only */ |
478 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
e715ad22 | 479 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
480 | |
481 | (unsigned int) | |
c5fcb476 | 482 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* submission */ |
8e669ac1 | 483 | (1<<ACL_WHERE_PREDATA)), |
8523533c TK |
484 | |
485 | #ifdef WITH_CONTENT_SCAN | |
8e669ac1 | 486 | (unsigned int) |
14d57970 | 487 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* no_mbox_unspool */ |
e715ad22 TK |
488 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
489 | (1<<ACL_WHERE_MIME)), | |
8523533c | 490 | #endif |
a6c4ab60 | 491 | |
29aba418 TF |
492 | (unsigned int) |
493 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakedefer */ | |
494 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
495 | (1<<ACL_WHERE_MIME)), | |
496 | ||
8e669ac1 | 497 | (unsigned int) |
a6c4ab60 | 498 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakereject */ |
e715ad22 TK |
499 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
500 | (1<<ACL_WHERE_MIME)), | |
8523533c | 501 | |
c5fcb476 PH |
502 | (1<<ACL_WHERE_NOTSMTP) /* no_multiline */ |
503 | }; | |
504 | ||
505 | /* Structure listing various control arguments, with their characteristics. */ | |
059ec3d9 PH |
506 | |
507 | typedef struct control_def { | |
508 | uschar *name; | |
509 | int value; /* CONTROL_xxx value */ | |
059ec3d9 PH |
510 | BOOL has_option; /* Has /option(s) following */ |
511 | } control_def; | |
512 | ||
513 | static control_def controls_list[] = { | |
8523533c TK |
514 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
515 | { US"bmi_run", CONTROL_BMI_RUN, FALSE}, | |
fb2274d4 TK |
516 | #endif |
517 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
518 | { US"dk_verify", CONTROL_DK_VERIFY, FALSE}, | |
8523533c | 519 | #endif |
c5fcb476 PH |
520 | { US"caseful_local_part", CONTROL_CASEFUL_LOCAL_PART, FALSE}, |
521 | { US"caselower_local_part", CONTROL_CASELOWER_LOCAL_PART, FALSE}, | |
522 | { US"enforce_sync", CONTROL_ENFORCE_SYNC, FALSE}, | |
523 | { US"freeze", CONTROL_FREEZE, FALSE}, | |
524 | { US"no_enforce_sync", CONTROL_NO_ENFORCE_SYNC, FALSE}, | |
525 | { US"no_multiline_responses", CONTROL_NO_MULTILINE, FALSE}, | |
526 | { US"queue_only", CONTROL_QUEUE_ONLY, FALSE}, | |
8523533c TK |
527 | #ifdef WITH_CONTENT_SCAN |
528 | { US"no_mbox_unspool", CONTROL_NO_MBOX_UNSPOOL, FALSE}, | |
8523533c | 529 | #endif |
29aba418 | 530 | { US"fakedefer", CONTROL_FAKEDEFER, TRUE}, |
0f9b0483 | 531 | { US"fakereject", CONTROL_FAKEREJECT, TRUE}, |
c5fcb476 | 532 | { US"submission", CONTROL_SUBMISSION, TRUE} |
059ec3d9 PH |
533 | }; |
534 | ||
e5a9dba6 PH |
535 | /* Support data structures for Client SMTP Authorization. acl_verify_csa() |
536 | caches its result in a tree to avoid repeated DNS queries. The result is an | |
537 | integer code which is used as an index into the following tables of | |
538 | explanatory strings and verification return codes. */ | |
539 | ||
540 | static tree_node *csa_cache = NULL; | |
541 | ||
542 | enum { CSA_UNKNOWN, CSA_OK, CSA_DEFER_SRV, CSA_DEFER_ADDR, | |
543 | CSA_FAIL_EXPLICIT, CSA_FAIL_DOMAIN, CSA_FAIL_NOADDR, CSA_FAIL_MISMATCH }; | |
544 | ||
545 | /* The acl_verify_csa() return code is translated into an acl_verify() return | |
546 | code using the following table. It is OK unless the client is definitely not | |
547 | authorized. This is because CSA is supposed to be optional for sending sites, | |
548 | so recipients should not be too strict about checking it - especially because | |
549 | DNS problems are quite likely to occur. It's possible to use $csa_status in | |
550 | further ACL conditions to distinguish ok, unknown, and defer if required, but | |
551 | the aim is to make the usual configuration simple. */ | |
552 | ||
553 | static int csa_return_code[] = { | |
554 | OK, OK, OK, OK, | |
555 | FAIL, FAIL, FAIL, FAIL | |
556 | }; | |
557 | ||
558 | static uschar *csa_status_string[] = { | |
559 | US"unknown", US"ok", US"defer", US"defer", | |
560 | US"fail", US"fail", US"fail", US"fail" | |
561 | }; | |
562 | ||
563 | static uschar *csa_reason_string[] = { | |
564 | US"unknown", | |
565 | US"ok", | |
566 | US"deferred (SRV lookup failed)", | |
567 | US"deferred (target address lookup failed)", | |
568 | US"failed (explicit authorization required)", | |
569 | US"failed (host name not authorized)", | |
570 | US"failed (no authorized addresses)", | |
571 | US"failed (client address mismatch)" | |
572 | }; | |
573 | ||
059ec3d9 PH |
574 | /* Enable recursion between acl_check_internal() and acl_check_condition() */ |
575 | ||
576 | static int acl_check_internal(int, address_item *, uschar *, int, uschar **, | |
577 | uschar **); | |
578 | ||
579 | ||
580 | /************************************************* | |
581 | * Pick out name from list * | |
582 | *************************************************/ | |
583 | ||
584 | /* Use a binary chop method | |
585 | ||
586 | Arguments: | |
587 | name name to find | |
588 | list list of names | |
589 | end size of list | |
590 | ||
591 | Returns: offset in list, or -1 if not found | |
592 | */ | |
593 | ||
594 | static int | |
595 | acl_checkname(uschar *name, uschar **list, int end) | |
596 | { | |
597 | int start = 0; | |
598 | ||
599 | while (start < end) | |
600 | { | |
601 | int mid = (start + end)/2; | |
602 | int c = Ustrcmp(name, list[mid]); | |
603 | if (c == 0) return mid; | |
604 | if (c < 0) end = mid; else start = mid + 1; | |
605 | } | |
606 | ||
607 | return -1; | |
608 | } | |
609 | ||
610 | ||
611 | /************************************************* | |
612 | * Read and parse one ACL * | |
613 | *************************************************/ | |
614 | ||
615 | /* This function is called both from readconf in order to parse the ACLs in the | |
616 | configuration file, and also when an ACL is encountered dynamically (e.g. as | |
617 | the result of an expansion). It is given a function to call in order to | |
618 | retrieve the lines of the ACL. This function handles skipping comments and | |
619 | blank lines (where relevant). | |
620 | ||
621 | Arguments: | |
622 | func function to get next line of ACL | |
623 | error where to put an error message | |
624 | ||
625 | Returns: pointer to ACL, or NULL | |
626 | NULL can be legal (empty ACL); in this case error will be NULL | |
627 | */ | |
628 | ||
629 | acl_block * | |
630 | acl_read(uschar *(*func)(void), uschar **error) | |
631 | { | |
632 | acl_block *yield = NULL; | |
633 | acl_block **lastp = &yield; | |
634 | acl_block *this = NULL; | |
635 | acl_condition_block *cond; | |
636 | acl_condition_block **condp = NULL; | |
637 | uschar *s; | |
638 | ||
639 | *error = NULL; | |
640 | ||
641 | while ((s = (*func)()) != NULL) | |
642 | { | |
643 | int v, c; | |
644 | BOOL negated = FALSE; | |
645 | uschar *saveline = s; | |
646 | uschar name[64]; | |
647 | ||
648 | /* Conditions (but not verbs) are allowed to be negated by an initial | |
649 | exclamation mark. */ | |
650 | ||
651 | while (isspace(*s)) s++; | |
652 | if (*s == '!') | |
653 | { | |
654 | negated = TRUE; | |
655 | s++; | |
656 | } | |
657 | ||
cf00dad6 PH |
658 | /* Read the name of a verb or a condition, or the start of a new ACL, which |
659 | can be started by a name, or by a macro definition. */ | |
059ec3d9 PH |
660 | |
661 | s = readconf_readname(name, sizeof(name), s); | |
cf00dad6 | 662 | if (*s == ':' || isupper(name[0] && *s == '=')) return yield; |
059ec3d9 PH |
663 | |
664 | /* If a verb is unrecognized, it may be another condition or modifier that | |
665 | continues the previous verb. */ | |
666 | ||
667 | v = acl_checkname(name, verbs, sizeof(verbs)/sizeof(char *)); | |
668 | if (v < 0) | |
669 | { | |
670 | if (this == NULL) | |
671 | { | |
672 | *error = string_sprintf("unknown ACL verb in \"%s\"", saveline); | |
673 | return NULL; | |
674 | } | |
675 | } | |
676 | ||
677 | /* New verb */ | |
678 | ||
679 | else | |
680 | { | |
681 | if (negated) | |
682 | { | |
683 | *error = string_sprintf("malformed ACL line \"%s\"", saveline); | |
684 | return NULL; | |
685 | } | |
686 | this = store_get(sizeof(acl_block)); | |
687 | *lastp = this; | |
688 | lastp = &(this->next); | |
689 | this->next = NULL; | |
690 | this->verb = v; | |
691 | this->condition = NULL; | |
692 | condp = &(this->condition); | |
693 | if (*s == 0) continue; /* No condition on this line */ | |
694 | if (*s == '!') | |
695 | { | |
696 | negated = TRUE; | |
697 | s++; | |
698 | } | |
699 | s = readconf_readname(name, sizeof(name), s); /* Condition name */ | |
700 | } | |
701 | ||
702 | /* Handle a condition or modifier. */ | |
703 | ||
704 | c = acl_checkname(name, conditions, sizeof(conditions)/sizeof(char *)); | |
705 | if (c < 0) | |
706 | { | |
707 | *error = string_sprintf("unknown ACL condition/modifier in \"%s\"", | |
708 | saveline); | |
709 | return NULL; | |
710 | } | |
711 | ||
712 | /* The modifiers may not be negated */ | |
713 | ||
714 | if (negated && cond_modifiers[c]) | |
715 | { | |
716 | *error = string_sprintf("ACL error: negation is not allowed with " | |
717 | "\"%s\"", conditions[c]); | |
718 | return NULL; | |
719 | } | |
720 | ||
721 | /* ENDPASS may occur only with ACCEPT or DISCARD. */ | |
722 | ||
723 | if (c == ACLC_ENDPASS && | |
724 | this->verb != ACL_ACCEPT && | |
725 | this->verb != ACL_DISCARD) | |
726 | { | |
727 | *error = string_sprintf("ACL error: \"%s\" is not allowed with \"%s\"", | |
728 | conditions[c], verbs[this->verb]); | |
729 | return NULL; | |
730 | } | |
731 | ||
732 | cond = store_get(sizeof(acl_condition_block)); | |
733 | cond->next = NULL; | |
734 | cond->type = c; | |
735 | cond->u.negated = negated; | |
736 | ||
737 | *condp = cond; | |
738 | condp = &(cond->next); | |
739 | ||
740 | /* The "set" modifier is different in that its argument is "name=value" | |
741 | rather than just a value, and we can check the validity of the name, which | |
742 | gives us a variable number to insert into the data block. */ | |
743 | ||
744 | if (c == ACLC_SET) | |
745 | { | |
746 | if (Ustrncmp(s, "acl_", 4) != 0 || (s[4] != 'c' && s[4] != 'm') || | |
747 | !isdigit(s[5]) || (!isspace(s[6]) && s[6] != '=')) | |
748 | { | |
749 | *error = string_sprintf("unrecognized name after \"set\" in ACL " | |
750 | "modifier \"set %s\"", s); | |
751 | return NULL; | |
752 | } | |
753 | ||
754 | cond->u.varnumber = s[5] - '0'; | |
755 | if (s[4] == 'm') cond->u.varnumber += ACL_C_MAX; | |
756 | s += 6; | |
757 | while (isspace(*s)) s++; | |
758 | } | |
759 | ||
760 | /* For "set", we are now positioned for the data. For the others, only | |
761 | "endpass" has no data */ | |
762 | ||
763 | if (c != ACLC_ENDPASS) | |
764 | { | |
765 | if (*s++ != '=') | |
766 | { | |
767 | *error = string_sprintf("\"=\" missing after ACL \"%s\" %s", name, | |
768 | cond_modifiers[c]? US"modifier" : US"condition"); | |
769 | return NULL; | |
770 | } | |
771 | while (isspace(*s)) s++; | |
772 | cond->arg = string_copy(s); | |
773 | } | |
774 | } | |
775 | ||
776 | return yield; | |
777 | } | |
778 | ||
779 | ||
780 | ||
781 | /************************************************* | |
782 | * Handle warnings * | |
783 | *************************************************/ | |
784 | ||
785 | /* This function is called when a WARN verb's conditions are true. It adds to | |
786 | the message's headers, and/or writes information to the log. In each case, this | |
787 | only happens once (per message for headers, per connection for log). | |
788 | ||
789 | Arguments: | |
790 | where ACL_WHERE_xxxx indicating which ACL this is | |
791 | user_message message for adding to headers | |
792 | log_message message for logging, if different | |
793 | ||
794 | Returns: nothing | |
795 | */ | |
796 | ||
797 | static void | |
798 | acl_warn(int where, uschar *user_message, uschar *log_message) | |
799 | { | |
800 | int hlen; | |
801 | ||
802 | if (log_message != NULL && log_message != user_message) | |
803 | { | |
804 | uschar *text; | |
805 | string_item *logged; | |
806 | ||
807 | text = string_sprintf("%s Warning: %s", host_and_ident(TRUE), | |
808 | string_printing(log_message)); | |
809 | ||
810 | /* If a sender verification has failed, and the log message is "sender verify | |
811 | failed", add the failure message. */ | |
812 | ||
813 | if (sender_verified_failed != NULL && | |
814 | sender_verified_failed->message != NULL && | |
815 | strcmpic(log_message, US"sender verify failed") == 0) | |
816 | text = string_sprintf("%s: %s", text, sender_verified_failed->message); | |
817 | ||
9c7a242c PH |
818 | /* Search previously logged warnings. They are kept in malloc |
819 | store so they can be freed at the start of a new message. */ | |
059ec3d9 PH |
820 | |
821 | for (logged = acl_warn_logged; logged != NULL; logged = logged->next) | |
822 | if (Ustrcmp(logged->text, text) == 0) break; | |
823 | ||
824 | if (logged == NULL) | |
825 | { | |
826 | int length = Ustrlen(text) + 1; | |
827 | log_write(0, LOG_MAIN, "%s", text); | |
828 | logged = store_malloc(sizeof(string_item) + length); | |
829 | logged->text = (uschar *)logged + sizeof(string_item); | |
830 | memcpy(logged->text, text, length); | |
831 | logged->next = acl_warn_logged; | |
832 | acl_warn_logged = logged; | |
833 | } | |
834 | } | |
835 | ||
836 | /* If there's no user message, we are done. */ | |
837 | ||
838 | if (user_message == NULL) return; | |
839 | ||
840 | /* If this isn't a message ACL, we can't do anything with a user message. | |
841 | Log an error. */ | |
842 | ||
843 | if (where > ACL_WHERE_NOTSMTP) | |
844 | { | |
845 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting " | |
846 | "found in a non-message (%s) ACL: cannot specify header lines here: " | |
847 | "message ignored", acl_wherenames[where]); | |
848 | return; | |
849 | } | |
850 | ||
851 | /* Treat the user message as a sequence of one or more header lines. */ | |
852 | ||
853 | hlen = Ustrlen(user_message); | |
854 | if (hlen > 0) | |
855 | { | |
856 | uschar *text, *p, *q; | |
857 | ||
858 | /* Add a final newline if not present */ | |
859 | ||
860 | text = ((user_message)[hlen-1] == '\n')? user_message : | |
861 | string_sprintf("%s\n", user_message); | |
862 | ||
863 | /* Loop for multiple header lines, taking care about continuations */ | |
864 | ||
865 | for (p = q = text; *p != 0; ) | |
866 | { | |
867 | uschar *s; | |
868 | int newtype = htype_add_bot; | |
869 | header_line **hptr = &acl_warn_headers; | |
870 | ||
871 | /* Find next header line within the string */ | |
872 | ||
873 | for (;;) | |
874 | { | |
875 | q = Ustrchr(q, '\n'); | |
876 | if (*(++q) != ' ' && *q != '\t') break; | |
877 | } | |
878 | ||
879 | /* If the line starts with a colon, interpret the instruction for where to | |
880 | add it. This temporarily sets up a new type. */ | |
881 | ||
882 | if (*p == ':') | |
883 | { | |
884 | if (strncmpic(p, US":after_received:", 16) == 0) | |
885 | { | |
886 | newtype = htype_add_rec; | |
887 | p += 16; | |
888 | } | |
8523533c TK |
889 | else if (strncmpic(p, US":at_start_rfc:", 14) == 0) |
890 | { | |
891 | newtype = htype_add_rfc; | |
892 | p += 14; | |
8e669ac1 | 893 | } |
059ec3d9 PH |
894 | else if (strncmpic(p, US":at_start:", 10) == 0) |
895 | { | |
896 | newtype = htype_add_top; | |
897 | p += 10; | |
898 | } | |
899 | else if (strncmpic(p, US":at_end:", 8) == 0) | |
900 | { | |
901 | newtype = htype_add_bot; | |
902 | p += 8; | |
903 | } | |
904 | while (*p == ' ' || *p == '\t') p++; | |
905 | } | |
906 | ||
907 | /* See if this line starts with a header name, and if not, add X-ACL-Warn: | |
908 | to the front of it. */ | |
909 | ||
910 | for (s = p; s < q - 1; s++) | |
911 | { | |
912 | if (*s == ':' || !isgraph(*s)) break; | |
913 | } | |
914 | ||
915 | s = string_sprintf("%s%.*s", (*s == ':')? "" : "X-ACL-Warn: ", q - p, p); | |
916 | hlen = Ustrlen(s); | |
917 | ||
918 | /* See if this line has already been added */ | |
919 | ||
920 | while (*hptr != NULL) | |
921 | { | |
922 | if (Ustrncmp((*hptr)->text, s, hlen) == 0) break; | |
923 | hptr = &((*hptr)->next); | |
924 | } | |
925 | ||
926 | /* Add if not previously present */ | |
927 | ||
928 | if (*hptr == NULL) | |
929 | { | |
930 | header_line *h = store_get(sizeof(header_line)); | |
931 | h->text = s; | |
932 | h->next = NULL; | |
933 | h->type = newtype; | |
934 | h->slen = hlen; | |
935 | *hptr = h; | |
936 | hptr = &(h->next); | |
937 | } | |
938 | ||
939 | /* Advance for next header line within the string */ | |
940 | ||
941 | p = q; | |
942 | } | |
943 | } | |
944 | } | |
945 | ||
946 | ||
947 | ||
948 | /************************************************* | |
949 | * Verify and check reverse DNS * | |
950 | *************************************************/ | |
951 | ||
952 | /* Called from acl_verify() below. We look up the host name(s) of the client IP | |
953 | address if this has not yet been done. The host_name_lookup() function checks | |
954 | that one of these names resolves to an address list that contains the client IP | |
955 | address, so we don't actually have to do the check here. | |
956 | ||
957 | Arguments: | |
958 | user_msgptr pointer for user message | |
959 | log_msgptr pointer for log message | |
960 | ||
961 | Returns: OK verification condition succeeded | |
962 | FAIL verification failed | |
963 | DEFER there was a problem verifying | |
964 | */ | |
965 | ||
966 | static int | |
967 | acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr) | |
968 | { | |
969 | int rc; | |
970 | ||
971 | user_msgptr = user_msgptr; /* stop compiler warning */ | |
972 | ||
973 | /* Previous success */ | |
974 | ||
975 | if (sender_host_name != NULL) return OK; | |
976 | ||
977 | /* Previous failure */ | |
978 | ||
979 | if (host_lookup_failed) | |
980 | { | |
981 | *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg); | |
982 | return FAIL; | |
983 | } | |
984 | ||
985 | /* Need to do a lookup */ | |
986 | ||
987 | HDEBUG(D_acl) | |
988 | debug_printf("looking up host name to force name/address consistency check\n"); | |
989 | ||
990 | if ((rc = host_name_lookup()) != OK) | |
991 | { | |
992 | *log_msgptr = (rc == DEFER)? | |
993 | US"host lookup deferred for reverse lookup check" | |
994 | : | |
995 | string_sprintf("host lookup failed for reverse lookup check%s", | |
996 | host_lookup_msg); | |
997 | return rc; /* DEFER or FAIL */ | |
998 | } | |
999 | ||
1000 | host_build_sender_fullhost(); | |
1001 | return OK; | |
1002 | } | |
1003 | ||
1004 | ||
1005 | ||
e5a9dba6 PH |
1006 | /************************************************* |
1007 | * Check client IP address matches CSA target * | |
1008 | *************************************************/ | |
1009 | ||
1010 | /* Called from acl_verify_csa() below. This routine scans a section of a DNS | |
1011 | response for address records belonging to the CSA target hostname. The section | |
1012 | is specified by the reset argument, either RESET_ADDITIONAL or RESET_ANSWERS. | |
1013 | If one of the addresses matches the client's IP address, then the client is | |
1014 | authorized by CSA. If there are target IP addresses but none of them match | |
1015 | then the client is using an unauthorized IP address. If there are no target IP | |
1016 | addresses then the client cannot be using an authorized IP address. (This is | |
1017 | an odd configuration - why didn't the SRV record have a weight of 1 instead?) | |
1018 | ||
1019 | Arguments: | |
1020 | dnsa the DNS answer block | |
1021 | dnss a DNS scan block for us to use | |
1022 | reset option specifing what portion to scan, as described above | |
1023 | target the target hostname to use for matching RR names | |
1024 | ||
1025 | Returns: CSA_OK successfully authorized | |
1026 | CSA_FAIL_MISMATCH addresses found but none matched | |
1027 | CSA_FAIL_NOADDR no target addresses found | |
1028 | */ | |
1029 | ||
1030 | static int | |
1031 | acl_verify_csa_address(dns_answer *dnsa, dns_scan *dnss, int reset, | |
1032 | uschar *target) | |
1033 | { | |
1034 | dns_record *rr; | |
1035 | dns_address *da; | |
1036 | ||
1037 | BOOL target_found = FALSE; | |
1038 | ||
1039 | for (rr = dns_next_rr(dnsa, dnss, reset); | |
1040 | rr != NULL; | |
1041 | rr = dns_next_rr(dnsa, dnss, RESET_NEXT)) | |
1042 | { | |
1043 | /* Check this is an address RR for the target hostname. */ | |
1044 | ||
1045 | if (rr->type != T_A | |
1046 | #if HAVE_IPV6 | |
1047 | && rr->type != T_AAAA | |
1048 | #ifdef SUPPORT_A6 | |
1049 | && rr->type != T_A6 | |
1050 | #endif | |
1051 | #endif | |
1052 | ) continue; | |
1053 | ||
1054 | if (strcmpic(target, rr->name) != 0) continue; | |
1055 | ||
1056 | target_found = TRUE; | |
1057 | ||
1058 | /* Turn the target address RR into a list of textual IP addresses and scan | |
1059 | the list. There may be more than one if it is an A6 RR. */ | |
1060 | ||
1061 | for (da = dns_address_from_rr(dnsa, rr); da != NULL; da = da->next) | |
1062 | { | |
1063 | /* If the client IP address matches the target IP address, it's good! */ | |
1064 | ||
1065 | DEBUG(D_acl) debug_printf("CSA target address is %s\n", da->address); | |
1066 | ||
1067 | if (strcmpic(sender_host_address, da->address) == 0) return CSA_OK; | |
1068 | } | |
1069 | } | |
1070 | ||
1071 | /* If we found some target addresses but none of them matched, the client is | |
1072 | using an unauthorized IP address, otherwise the target has no authorized IP | |
1073 | addresses. */ | |
1074 | ||
1075 | if (target_found) return CSA_FAIL_MISMATCH; | |
1076 | else return CSA_FAIL_NOADDR; | |
1077 | } | |
1078 | ||
1079 | ||
1080 | ||
1081 | /************************************************* | |
1082 | * Verify Client SMTP Authorization * | |
1083 | *************************************************/ | |
1084 | ||
1085 | /* Called from acl_verify() below. This routine calls dns_lookup_special() | |
1086 | to find the CSA SRV record corresponding to the domain argument, or | |
1087 | $sender_helo_name if no argument is provided. It then checks that the | |
1088 | client is authorized, and that its IP address corresponds to the SRV | |
1089 | target's address by calling acl_verify_csa_address() above. The address | |
1090 | should have been returned in the DNS response's ADDITIONAL section, but if | |
1091 | not we perform another DNS lookup to get it. | |
1092 | ||
1093 | Arguments: | |
1094 | domain pointer to optional parameter following verify = csa | |
1095 | ||
1096 | Returns: CSA_UNKNOWN no valid CSA record found | |
1097 | CSA_OK successfully authorized | |
1098 | CSA_FAIL_* client is definitely not authorized | |
1099 | CSA_DEFER_* there was a DNS problem | |
1100 | */ | |
1101 | ||
1102 | static int | |
1103 | acl_verify_csa(uschar *domain) | |
1104 | { | |
1105 | tree_node *t; | |
1106 | uschar *found, *p; | |
1107 | int priority, weight, port; | |
1108 | dns_answer dnsa; | |
1109 | dns_scan dnss; | |
1110 | dns_record *rr; | |
1111 | int rc, type; | |
1112 | uschar target[256]; | |
1113 | ||
1114 | /* Work out the domain we are using for the CSA lookup. The default is the | |
1115 | client's HELO domain. If the client has not said HELO, use its IP address | |
1116 | instead. If it's a local client (exim -bs), CSA isn't applicable. */ | |
1117 | ||
1118 | while (isspace(*domain) && *domain != '\0') ++domain; | |
1119 | if (*domain == '\0') domain = sender_helo_name; | |
1120 | if (domain == NULL) domain = sender_host_address; | |
1121 | if (sender_host_address == NULL) return CSA_UNKNOWN; | |
1122 | ||
1123 | /* If we have an address literal, strip off the framing ready for turning it | |
1124 | into a domain. The framing consists of matched square brackets possibly | |
1125 | containing a keyword and a colon before the actual IP address. */ | |
1126 | ||
1127 | if (domain[0] == '[') | |
1128 | { | |
1129 | uschar *start = Ustrchr(domain, ':'); | |
1130 | if (start == NULL) start = domain; | |
1131 | domain = string_copyn(start + 1, Ustrlen(start) - 2); | |
1132 | } | |
1133 | ||
1134 | /* Turn domains that look like bare IP addresses into domains in the reverse | |
1135 | DNS. This code also deals with address literals and $sender_host_address. It's | |
1136 | not quite kosher to treat bare domains such as EHLO 192.0.2.57 the same as | |
1137 | address literals, but it's probably the most friendly thing to do. This is an | |
1138 | extension to CSA, so we allow it to be turned off for proper conformance. */ | |
1139 | ||
1140 | if (string_is_ip_address(domain, NULL)) | |
1141 | { | |
1142 | if (!dns_csa_use_reverse) return CSA_UNKNOWN; | |
1143 | dns_build_reverse(domain, target); | |
1144 | domain = target; | |
1145 | } | |
1146 | ||
1147 | /* Find out if we've already done the CSA check for this domain. If we have, | |
1148 | return the same result again. Otherwise build a new cached result structure | |
1149 | for this domain. The name is filled in now, and the value is filled in when | |
1150 | we return from this function. */ | |
1151 | ||
1152 | t = tree_search(csa_cache, domain); | |
1153 | if (t != NULL) return t->data.val; | |
1154 | ||
1155 | t = store_get_perm(sizeof(tree_node) + Ustrlen(domain)); | |
1156 | Ustrcpy(t->name, domain); | |
1157 | (void)tree_insertnode(&csa_cache, t); | |
1158 | ||
1159 | /* Now we are ready to do the actual DNS lookup(s). */ | |
1160 | ||
28e6ef29 | 1161 | found = domain; |
e5a9dba6 PH |
1162 | switch (dns_special_lookup(&dnsa, domain, T_CSA, &found)) |
1163 | { | |
1164 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1165 | ||
1166 | default: | |
1167 | return t->data.val = CSA_DEFER_SRV; | |
1168 | ||
1169 | /* If we found nothing, the client's authorization is unknown. */ | |
1170 | ||
1171 | case DNS_NOMATCH: | |
1172 | case DNS_NODATA: | |
1173 | return t->data.val = CSA_UNKNOWN; | |
1174 | ||
1175 | /* We got something! Go on to look at the reply in more detail. */ | |
1176 | ||
1177 | case DNS_SUCCEED: | |
1178 | break; | |
1179 | } | |
1180 | ||
1181 | /* Scan the reply for well-formed CSA SRV records. */ | |
1182 | ||
1183 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
1184 | rr != NULL; | |
1185 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
1186 | { | |
1187 | if (rr->type != T_SRV) continue; | |
1188 | ||
1189 | /* Extract the numerical SRV fields (p is incremented) */ | |
1190 | ||
1191 | p = rr->data; | |
1192 | GETSHORT(priority, p); | |
1193 | GETSHORT(weight, p); | |
1194 | GETSHORT(port, p); | |
1195 | ||
1196 | DEBUG(D_acl) | |
1197 | debug_printf("CSA priority=%d weight=%d port=%d\n", priority, weight, port); | |
1198 | ||
1199 | /* Check the CSA version number */ | |
1200 | ||
1201 | if (priority != 1) continue; | |
1202 | ||
1203 | /* If the domain does not have a CSA SRV record of its own (i.e. the domain | |
1204 | found by dns_special_lookup() is a parent of the one we asked for), we check | |
1205 | the subdomain assertions in the port field. At the moment there's only one | |
1206 | assertion: legitimate SMTP clients are all explicitly authorized with CSA | |
1207 | SRV records of their own. */ | |
1208 | ||
1209 | if (found != domain) | |
1210 | { | |
1211 | if (port & 1) | |
1212 | return t->data.val = CSA_FAIL_EXPLICIT; | |
1213 | else | |
1214 | return t->data.val = CSA_UNKNOWN; | |
1215 | } | |
1216 | ||
1217 | /* This CSA SRV record refers directly to our domain, so we check the value | |
1218 | in the weight field to work out the domain's authorization. 0 and 1 are | |
1219 | unauthorized; 3 means the client is authorized but we can't check the IP | |
1220 | address in order to authenticate it, so we treat it as unknown; values | |
1221 | greater than 3 are undefined. */ | |
1222 | ||
1223 | if (weight < 2) return t->data.val = CSA_FAIL_DOMAIN; | |
1224 | ||
1225 | if (weight > 2) continue; | |
1226 | ||
1227 | /* Weight == 2, which means the domain is authorized. We must check that the | |
1228 | client's IP address is listed as one of the SRV target addresses. Save the | |
1229 | target hostname then break to scan the additional data for its addresses. */ | |
1230 | ||
1231 | (void)dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, | |
1232 | (DN_EXPAND_ARG4_TYPE)target, sizeof(target)); | |
1233 | ||
1234 | DEBUG(D_acl) debug_printf("CSA target is %s\n", target); | |
1235 | ||
1236 | break; | |
1237 | } | |
1238 | ||
1239 | /* If we didn't break the loop then no appropriate records were found. */ | |
1240 | ||
1241 | if (rr == NULL) return t->data.val = CSA_UNKNOWN; | |
1242 | ||
1243 | /* Do not check addresses if the target is ".", in accordance with RFC 2782. | |
1244 | A target of "." indicates there are no valid addresses, so the client cannot | |
1245 | be authorized. (This is an odd configuration because weight=2 target=. is | |
1246 | equivalent to weight=1, but we check for it in order to keep load off the | |
1247 | root name servers.) Note that dn_expand() turns "." into "". */ | |
1248 | ||
1249 | if (Ustrcmp(target, "") == 0) return t->data.val = CSA_FAIL_NOADDR; | |
1250 | ||
1251 | /* Scan the additional section of the CSA SRV reply for addresses belonging | |
1252 | to the target. If the name server didn't return any additional data (e.g. | |
1253 | because it does not fully support SRV records), we need to do another lookup | |
1254 | to obtain the target addresses; otherwise we have a definitive result. */ | |
1255 | ||
1256 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ADDITIONAL, target); | |
1257 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1258 | ||
1259 | /* The DNS lookup type corresponds to the IP version used by the client. */ | |
1260 | ||
1261 | #if HAVE_IPV6 | |
1262 | if (Ustrchr(sender_host_address, ':') != NULL) | |
1263 | type = T_AAAA; | |
1264 | else | |
1265 | #endif /* HAVE_IPV6 */ | |
1266 | type = T_A; | |
1267 | ||
1268 | ||
1269 | #if HAVE_IPV6 && defined(SUPPORT_A6) | |
1270 | DNS_LOOKUP_AGAIN: | |
1271 | #endif | |
1272 | ||
1273 | switch (dns_lookup(&dnsa, target, type, NULL)) | |
1274 | { | |
1275 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1276 | ||
1277 | default: | |
1278 | return t->data.val = CSA_DEFER_ADDR; | |
1279 | ||
1280 | /* If the query succeeded, scan the addresses and return the result. */ | |
1281 | ||
1282 | case DNS_SUCCEED: | |
1283 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ANSWERS, target); | |
1284 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1285 | /* else fall through */ | |
1286 | ||
1287 | /* If the target has no IP addresses, the client cannot have an authorized | |
1288 | IP address. However, if the target site uses A6 records (not AAAA records) | |
1289 | we have to do yet another lookup in order to check them. */ | |
1290 | ||
1291 | case DNS_NOMATCH: | |
1292 | case DNS_NODATA: | |
1293 | ||
1294 | #if HAVE_IPV6 && defined(SUPPORT_A6) | |
1295 | if (type == T_AAAA) { type = T_A6; goto DNS_LOOKUP_AGAIN; } | |
1296 | #endif | |
1297 | ||
1298 | return t->data.val = CSA_FAIL_NOADDR; | |
1299 | } | |
1300 | } | |
1301 | ||
1302 | ||
1303 | ||
059ec3d9 PH |
1304 | /************************************************* |
1305 | * Handle verification (address & other) * | |
1306 | *************************************************/ | |
1307 | ||
1308 | /* This function implements the "verify" condition. It is called when | |
1309 | encountered in any ACL, because some tests are almost always permitted. Some | |
1310 | just don't make sense, and always fail (for example, an attempt to test a host | |
1311 | lookup for a non-TCP/IP message). Others are restricted to certain ACLs. | |
1312 | ||
1313 | Arguments: | |
1314 | where where called from | |
1315 | addr the recipient address that the ACL is handling, or NULL | |
1316 | arg the argument of "verify" | |
1317 | user_msgptr pointer for user message | |
1318 | log_msgptr pointer for log message | |
1319 | basic_errno where to put verify errno | |
1320 | ||
1321 | Returns: OK verification condition succeeded | |
1322 | FAIL verification failed | |
1323 | DEFER there was a problem verifying | |
1324 | ERROR syntax error | |
1325 | */ | |
1326 | ||
1327 | static int | |
1328 | acl_verify(int where, address_item *addr, uschar *arg, | |
1329 | uschar **user_msgptr, uschar **log_msgptr, int *basic_errno) | |
1330 | { | |
1331 | int sep = '/'; | |
1332 | int callout = -1; | |
1333 | int callout_overall = -1; | |
4deaf07d | 1334 | int callout_connect = -1; |
059ec3d9 PH |
1335 | int verify_options = 0; |
1336 | int rc; | |
1337 | BOOL verify_header_sender = FALSE; | |
1338 | BOOL defer_ok = FALSE; | |
1339 | BOOL callout_defer_ok = FALSE; | |
1340 | BOOL no_details = FALSE; | |
eafd343b | 1341 | BOOL success_on_redirect = FALSE; |
059ec3d9 PH |
1342 | address_item *sender_vaddr = NULL; |
1343 | uschar *verify_sender_address = NULL; | |
1344 | uschar *pm_mailfrom = NULL; | |
1345 | uschar *se_mailfrom = NULL; | |
596875b3 PH |
1346 | |
1347 | /* Some of the verify items have slash-separated options; some do not. Diagnose | |
1348 | an error if options are given for items that don't expect them. This code has | |
1349 | now got very message. Refactoring to use a table would be a good idea one day. | |
1350 | */ | |
1351 | ||
1352 | uschar *slash = Ustrchr(arg, '/'); | |
059ec3d9 PH |
1353 | uschar *list = arg; |
1354 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
1355 | ||
1356 | if (ss == NULL) goto BAD_VERIFY; | |
1357 | ||
1358 | /* Handle name/address consistency verification in a separate function. */ | |
1359 | ||
1360 | if (strcmpic(ss, US"reverse_host_lookup") == 0) | |
1361 | { | |
596875b3 | 1362 | if (slash != NULL) goto NO_OPTIONS; |
059ec3d9 PH |
1363 | if (sender_host_address == NULL) return OK; |
1364 | return acl_verify_reverse(user_msgptr, log_msgptr); | |
1365 | } | |
1366 | ||
1367 | /* TLS certificate verification is done at STARTTLS time; here we just | |
1368 | test whether it was successful or not. (This is for optional verification; for | |
1369 | mandatory verification, the connection doesn't last this long.) */ | |
1370 | ||
1371 | if (strcmpic(ss, US"certificate") == 0) | |
1372 | { | |
596875b3 | 1373 | if (slash != NULL) goto NO_OPTIONS; |
059ec3d9 PH |
1374 | if (tls_certificate_verified) return OK; |
1375 | *user_msgptr = US"no verified certificate"; | |
1376 | return FAIL; | |
1377 | } | |
1378 | ||
d7b47fd0 PH |
1379 | /* We can test the result of optional HELO verification that might have |
1380 | occurred earlier. If not, we can attempt the verification now. */ | |
059ec3d9 | 1381 | |
596875b3 PH |
1382 | if (strcmpic(ss, US"helo") == 0) |
1383 | { | |
1384 | if (slash != NULL) goto NO_OPTIONS; | |
d7b47fd0 PH |
1385 | if (helo_verified) return OK; |
1386 | if (helo_verify_failed) return FAIL; | |
1387 | if (smtp_verify_helo()) return helo_verified? OK : FAIL; | |
1388 | return DEFER; | |
596875b3 | 1389 | } |
059ec3d9 | 1390 | |
e5a9dba6 PH |
1391 | /* Do Client SMTP Authorization checks in a separate function, and turn the |
1392 | result code into user-friendly strings. */ | |
1393 | ||
1394 | if (strcmpic(ss, US"csa") == 0) | |
1395 | { | |
1396 | rc = acl_verify_csa(list); | |
1397 | *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s", | |
1398 | csa_reason_string[rc]); | |
1399 | csa_status = csa_status_string[rc]; | |
1400 | DEBUG(D_acl) debug_printf("CSA result %s\n", csa_status); | |
1401 | return csa_return_code[rc]; | |
1402 | } | |
1403 | ||
596875b3 PH |
1404 | /* Check that all relevant header lines have the correct syntax. If there is |
1405 | a syntax error, we return details of the error to the sender if configured to | |
1406 | send out full details. (But a "message" setting on the ACL can override, as | |
1407 | always). */ | |
059ec3d9 | 1408 | |
596875b3 | 1409 | if (strcmpic(ss, US"header_syntax") == 0) |
059ec3d9 | 1410 | { |
596875b3 | 1411 | if (slash != NULL) goto NO_OPTIONS; |
1c41c9cc | 1412 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; |
596875b3 PH |
1413 | rc = verify_check_headers(log_msgptr); |
1414 | if (rc != OK && smtp_return_error_details && *log_msgptr != NULL) | |
1415 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1416 | return rc; | |
1417 | } | |
059ec3d9 | 1418 | |
1c41c9cc PH |
1419 | /* Check that no recipient of this message is "blind", that is, every envelope |
1420 | recipient must be mentioned in either To: or Cc:. */ | |
1421 | ||
1422 | if (strcmpic(ss, US"not_blind") == 0) | |
1423 | { | |
1424 | if (slash != NULL) goto NO_OPTIONS; | |
1425 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; | |
1426 | rc = verify_check_notblind(); | |
1427 | if (rc != OK) | |
1428 | { | |
1429 | *log_msgptr = string_sprintf("bcc recipient detected"); | |
1430 | if (smtp_return_error_details) | |
1431 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1432 | } | |
1433 | return rc; | |
1434 | } | |
059ec3d9 | 1435 | |
596875b3 PH |
1436 | /* The remaining verification tests check recipient and sender addresses, |
1437 | either from the envelope or from the header. There are a number of | |
1438 | slash-separated options that are common to all of them. */ | |
059ec3d9 | 1439 | |
059ec3d9 | 1440 | |
596875b3 PH |
1441 | /* Check that there is at least one verifiable sender address in the relevant |
1442 | header lines. This can be followed by callout and defer options, just like | |
1443 | sender and recipient. */ | |
059ec3d9 | 1444 | |
596875b3 PH |
1445 | if (strcmpic(ss, US"header_sender") == 0) |
1446 | { | |
1c41c9cc | 1447 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; |
596875b3 | 1448 | verify_header_sender = TRUE; |
059ec3d9 PH |
1449 | } |
1450 | ||
1451 | /* Otherwise, first item in verify argument must be "sender" or "recipient". | |
1452 | In the case of a sender, this can optionally be followed by an address to use | |
1453 | in place of the actual sender (rare special-case requirement). */ | |
1454 | ||
1455 | else if (strncmpic(ss, US"sender", 6) == 0) | |
1456 | { | |
1457 | uschar *s = ss + 6; | |
1458 | if (where > ACL_WHERE_NOTSMTP) | |
1459 | { | |
1460 | *log_msgptr = string_sprintf("cannot verify sender in ACL for %s " | |
1461 | "(only possible for MAIL, RCPT, PREDATA, or DATA)", | |
1462 | acl_wherenames[where]); | |
1463 | return ERROR; | |
1464 | } | |
1465 | if (*s == 0) | |
1466 | verify_sender_address = sender_address; | |
1467 | else | |
1468 | { | |
1469 | while (isspace(*s)) s++; | |
1470 | if (*s++ != '=') goto BAD_VERIFY; | |
1471 | while (isspace(*s)) s++; | |
1472 | verify_sender_address = string_copy(s); | |
1473 | } | |
1474 | } | |
1475 | else | |
1476 | { | |
1477 | if (strcmpic(ss, US"recipient") != 0) goto BAD_VERIFY; | |
1478 | if (addr == NULL) | |
1479 | { | |
1480 | *log_msgptr = string_sprintf("cannot verify recipient in ACL for %s " | |
1481 | "(only possible for RCPT)", acl_wherenames[where]); | |
1482 | return ERROR; | |
1483 | } | |
1484 | } | |
1485 | ||
596875b3 PH |
1486 | /* Remaining items are optional; they apply to sender and recipient |
1487 | verification, including "header sender" verification. */ | |
059ec3d9 PH |
1488 | |
1489 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) | |
1490 | != NULL) | |
1491 | { | |
1492 | if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE; | |
1493 | else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE; | |
eafd343b | 1494 | else if (strcmpic(ss, US"success_on_redirect") == 0) success_on_redirect = TRUE; |
059ec3d9 PH |
1495 | |
1496 | /* These two old options are left for backwards compatibility */ | |
1497 | ||
1498 | else if (strcmpic(ss, US"callout_defer_ok") == 0) | |
1499 | { | |
1500 | callout_defer_ok = TRUE; | |
1501 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1502 | } | |
1503 | ||
1504 | else if (strcmpic(ss, US"check_postmaster") == 0) | |
1505 | { | |
1506 | pm_mailfrom = US""; | |
1507 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1508 | } | |
1509 | ||
1510 | /* The callout option has a number of sub-options, comma separated */ | |
1511 | ||
1512 | else if (strncmpic(ss, US"callout", 7) == 0) | |
1513 | { | |
1514 | callout = CALLOUT_TIMEOUT_DEFAULT; | |
1515 | ss += 7; | |
1516 | if (*ss != 0) | |
1517 | { | |
1518 | while (isspace(*ss)) ss++; | |
1519 | if (*ss++ == '=') | |
1520 | { | |
1521 | int optsep = ','; | |
1522 | uschar *opt; | |
1523 | uschar buffer[256]; | |
1524 | while (isspace(*ss)) ss++; | |
8e669ac1 PH |
1525 | |
1526 | /* This callout option handling code has become a mess as new options | |
1527 | have been added in an ad hoc manner. It should be tidied up into some | |
4deaf07d | 1528 | kind of table-driven thing. */ |
8e669ac1 | 1529 | |
059ec3d9 PH |
1530 | while ((opt = string_nextinlist(&ss, &optsep, buffer, sizeof(buffer))) |
1531 | != NULL) | |
1532 | { | |
1533 | if (strcmpic(opt, US"defer_ok") == 0) callout_defer_ok = TRUE; | |
1534 | else if (strcmpic(opt, US"no_cache") == 0) | |
1535 | verify_options |= vopt_callout_no_cache; | |
1536 | else if (strcmpic(opt, US"random") == 0) | |
1537 | verify_options |= vopt_callout_random; | |
1538 | else if (strcmpic(opt, US"use_sender") == 0) | |
1539 | verify_options |= vopt_callout_recipsender; | |
1540 | else if (strcmpic(opt, US"use_postmaster") == 0) | |
1541 | verify_options |= vopt_callout_recippmaster; | |
1542 | else if (strcmpic(opt, US"postmaster") == 0) pm_mailfrom = US""; | |
2a4be8f9 PH |
1543 | else if (strcmpic(opt, US"fullpostmaster") == 0) |
1544 | { | |
1545 | pm_mailfrom = US""; | |
1546 | verify_options |= vopt_callout_fullpm; | |
1547 | } | |
059ec3d9 PH |
1548 | |
1549 | else if (strncmpic(opt, US"mailfrom", 8) == 0) | |
1550 | { | |
1551 | if (!verify_header_sender) | |
1552 | { | |
1553 | *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a " | |
1554 | "callout option only for verify=header_sender (detected in ACL " | |
1555 | "condition \"%s\")", arg); | |
1556 | return ERROR; | |
1557 | } | |
1558 | opt += 8; | |
1559 | while (isspace(*opt)) opt++; | |
1560 | if (*opt++ != '=') | |
1561 | { | |
1562 | *log_msgptr = string_sprintf("'=' expected after " | |
1563 | "\"mailfrom\" in ACL condition \"%s\"", arg); | |
1564 | return ERROR; | |
1565 | } | |
1566 | while (isspace(*opt)) opt++; | |
1567 | se_mailfrom = string_copy(opt); | |
1568 | } | |
1569 | ||
1570 | else if (strncmpic(opt, US"postmaster_mailfrom", 19) == 0) | |
1571 | { | |
1572 | opt += 19; | |
1573 | while (isspace(*opt)) opt++; | |
1574 | if (*opt++ != '=') | |
1575 | { | |
1576 | *log_msgptr = string_sprintf("'=' expected after " | |
1577 | "\"postmaster_mailfrom\" in ACL condition \"%s\"", arg); | |
1578 | return ERROR; | |
1579 | } | |
1580 | while (isspace(*opt)) opt++; | |
1581 | pm_mailfrom = string_copy(opt); | |
1582 | } | |
1583 | ||
1584 | else if (strncmpic(opt, US"maxwait", 7) == 0) | |
1585 | { | |
1586 | opt += 7; | |
1587 | while (isspace(*opt)) opt++; | |
1588 | if (*opt++ != '=') | |
1589 | { | |
1590 | *log_msgptr = string_sprintf("'=' expected after \"maxwait\" in " | |
1591 | "ACL condition \"%s\"", arg); | |
1592 | return ERROR; | |
1593 | } | |
1594 | while (isspace(*opt)) opt++; | |
1595 | callout_overall = readconf_readtime(opt, 0, FALSE); | |
1596 | if (callout_overall < 0) | |
1597 | { | |
1598 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1599 | "\"verify %s\"", arg); | |
1600 | return ERROR; | |
1601 | } | |
1602 | } | |
4deaf07d PH |
1603 | else if (strncmpic(opt, US"connect", 7) == 0) |
1604 | { | |
1605 | opt += 7; | |
1606 | while (isspace(*opt)) opt++; | |
1607 | if (*opt++ != '=') | |
1608 | { | |
1609 | *log_msgptr = string_sprintf("'=' expected after " | |
1610 | "\"callout_overaall\" in ACL condition \"%s\"", arg); | |
1611 | return ERROR; | |
1612 | } | |
1613 | while (isspace(*opt)) opt++; | |
1614 | callout_connect = readconf_readtime(opt, 0, FALSE); | |
1615 | if (callout_connect < 0) | |
1616 | { | |
1617 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1618 | "\"verify %s\"", arg); | |
1619 | return ERROR; | |
1620 | } | |
1621 | } | |
059ec3d9 PH |
1622 | else /* Plain time is callout connect/command timeout */ |
1623 | { | |
1624 | callout = readconf_readtime(opt, 0, FALSE); | |
1625 | if (callout < 0) | |
1626 | { | |
1627 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1628 | "\"verify %s\"", arg); | |
1629 | return ERROR; | |
1630 | } | |
1631 | } | |
1632 | } | |
1633 | } | |
1634 | else | |
1635 | { | |
1636 | *log_msgptr = string_sprintf("'=' expected after \"callout\" in " | |
1637 | "ACL condition \"%s\"", arg); | |
1638 | return ERROR; | |
1639 | } | |
1640 | } | |
1641 | } | |
1642 | ||
1643 | /* Option not recognized */ | |
1644 | ||
1645 | else | |
1646 | { | |
1647 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " | |
1648 | "condition \"verify %s\"", ss, arg); | |
1649 | return ERROR; | |
1650 | } | |
1651 | } | |
1652 | ||
1653 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == | |
1654 | (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1655 | { | |
1656 | *log_msgptr = US"only one of use_sender and use_postmaster can be set " | |
1657 | "for a recipient callout"; | |
1658 | return ERROR; | |
1659 | } | |
1660 | ||
1661 | /* Handle sender-in-header verification. Default the user message to the log | |
1662 | message if giving out verification details. */ | |
1663 | ||
1664 | if (verify_header_sender) | |
1665 | { | |
8e669ac1 | 1666 | int verrno; |
059ec3d9 | 1667 | rc = verify_check_header_address(user_msgptr, log_msgptr, callout, |
fe5b5d0b PH |
1668 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, verify_options, |
1669 | &verrno); | |
1670 | if (rc != OK) | |
8e669ac1 | 1671 | { |
fe5b5d0b PH |
1672 | *basic_errno = verrno; |
1673 | if (smtp_return_error_details) | |
1674 | { | |
1675 | if (*user_msgptr == NULL && *log_msgptr != NULL) | |
1676 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1677 | if (rc == DEFER) acl_temp_details = TRUE; | |
1678 | } | |
8e669ac1 | 1679 | } |
059ec3d9 PH |
1680 | } |
1681 | ||
1682 | /* Handle a sender address. The default is to verify *the* sender address, but | |
1683 | optionally a different address can be given, for special requirements. If the | |
1684 | address is empty, we are dealing with a bounce message that has no sender, so | |
1685 | we cannot do any checking. If the real sender address gets rewritten during | |
1686 | verification (e.g. DNS widening), set the flag to stop it being rewritten again | |
1687 | during message reception. | |
1688 | ||
1689 | A list of verified "sender" addresses is kept to try to avoid doing to much | |
1690 | work repetitively when there are multiple recipients in a message and they all | |
1691 | require sender verification. However, when callouts are involved, it gets too | |
1692 | complicated because different recipients may require different callout options. | |
1693 | Therefore, we always do a full sender verify when any kind of callout is | |
1694 | specified. Caching elsewhere, for instance in the DNS resolver and in the | |
1695 | callout handling, should ensure that this is not terribly inefficient. */ | |
1696 | ||
1697 | else if (verify_sender_address != NULL) | |
1698 | { | |
1699 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1700 | != 0) | |
1701 | { | |
1702 | *log_msgptr = US"use_sender or use_postmaster cannot be used for a " | |
1703 | "sender verify callout"; | |
1704 | return ERROR; | |
1705 | } | |
1706 | ||
1707 | sender_vaddr = verify_checked_sender(verify_sender_address); | |
1708 | if (sender_vaddr != NULL && /* Previously checked */ | |
1709 | callout <= 0) /* No callout needed this time */ | |
1710 | { | |
1711 | /* If the "routed" flag is set, it means that routing worked before, so | |
1712 | this check can give OK (the saved return code value, if set, belongs to a | |
1713 | callout that was done previously). If the "routed" flag is not set, routing | |
1714 | must have failed, so we use the saved return code. */ | |
1715 | ||
1716 | if (testflag(sender_vaddr, af_verify_routed)) rc = OK; else | |
1717 | { | |
1718 | rc = sender_vaddr->special_action; | |
1719 | *basic_errno = sender_vaddr->basic_errno; | |
1720 | } | |
1721 | HDEBUG(D_acl) debug_printf("using cached sender verify result\n"); | |
1722 | } | |
1723 | ||
1724 | /* Do a new verification, and cache the result. The cache is used to avoid | |
1725 | verifying the sender multiple times for multiple RCPTs when callouts are not | |
1726 | specified (see comments above). | |
1727 | ||
1728 | The cache is also used on failure to give details in response to the first | |
1729 | RCPT that gets bounced for this reason. However, this can be suppressed by | |
1730 | the no_details option, which sets the flag that says "this detail has already | |
1731 | been sent". The cache normally contains just one address, but there may be | |
1732 | more in esoteric circumstances. */ | |
1733 | ||
1734 | else | |
1735 | { | |
1736 | BOOL routed = TRUE; | |
2a3eea10 | 1737 | uschar *save_address_data = deliver_address_data; |
8e669ac1 | 1738 | |
059ec3d9 PH |
1739 | sender_vaddr = deliver_make_addr(verify_sender_address, TRUE); |
1740 | if (no_details) setflag(sender_vaddr, af_sverify_told); | |
1741 | if (verify_sender_address[0] != 0) | |
1742 | { | |
1743 | /* If this is the real sender address, save the unrewritten version | |
1744 | for use later in receive. Otherwise, set a flag so that rewriting the | |
1745 | sender in verify_address() does not update sender_address. */ | |
1746 | ||
1747 | if (verify_sender_address == sender_address) | |
1748 | sender_address_unrewritten = sender_address; | |
1749 | else | |
1750 | verify_options |= vopt_fake_sender; | |
1751 | ||
eafd343b TK |
1752 | if (success_on_redirect) |
1753 | verify_options |= vopt_success_on_redirect; | |
1754 | ||
059ec3d9 PH |
1755 | /* The recipient, qualify, and expn options are never set in |
1756 | verify_options. */ | |
1757 | ||
1758 | rc = verify_address(sender_vaddr, NULL, verify_options, callout, | |
4deaf07d | 1759 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, &routed); |
059ec3d9 PH |
1760 | |
1761 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); | |
1762 | ||
1763 | if (rc == OK) | |
1764 | { | |
1765 | if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0) | |
1766 | { | |
1767 | DEBUG(D_acl) debug_printf("sender %s verified ok as %s\n", | |
1768 | verify_sender_address, sender_vaddr->address); | |
1769 | } | |
1770 | else | |
1771 | { | |
1772 | DEBUG(D_acl) debug_printf("sender %s verified ok\n", | |
1773 | verify_sender_address); | |
1774 | } | |
1775 | } | |
1776 | else *basic_errno = sender_vaddr->basic_errno; | |
1777 | } | |
1778 | else rc = OK; /* Null sender */ | |
1779 | ||
1780 | /* Cache the result code */ | |
1781 | ||
1782 | if (routed) setflag(sender_vaddr, af_verify_routed); | |
1783 | if (callout > 0) setflag(sender_vaddr, af_verify_callout); | |
1784 | sender_vaddr->special_action = rc; | |
1785 | sender_vaddr->next = sender_verified_list; | |
1786 | sender_verified_list = sender_vaddr; | |
8e669ac1 PH |
1787 | |
1788 | /* Restore the recipient address data, which might have been clobbered by | |
2a3eea10 | 1789 | the sender verification. */ |
8e669ac1 | 1790 | |
2a3eea10 | 1791 | deliver_address_data = save_address_data; |
059ec3d9 | 1792 | } |
8e669ac1 | 1793 | |
2a3eea10 PH |
1794 | /* Put the sender address_data value into $sender_address_data */ |
1795 | ||
8e669ac1 | 1796 | sender_address_data = sender_vaddr->p.address_data; |
059ec3d9 PH |
1797 | } |
1798 | ||
1799 | /* A recipient address just gets a straightforward verify; again we must handle | |
1800 | the DEFER overrides. */ | |
1801 | ||
1802 | else | |
1803 | { | |
1804 | address_item addr2; | |
1805 | ||
eafd343b TK |
1806 | if (success_on_redirect) |
1807 | verify_options |= vopt_success_on_redirect; | |
1808 | ||
059ec3d9 PH |
1809 | /* We must use a copy of the address for verification, because it might |
1810 | get rewritten. */ | |
1811 | ||
1812 | addr2 = *addr; | |
1813 | rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout, | |
4deaf07d | 1814 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, NULL); |
059ec3d9 | 1815 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); |
8e669ac1 | 1816 | |
059ec3d9 | 1817 | *log_msgptr = addr2.message; |
8e669ac1 | 1818 | *user_msgptr = (addr2.user_message != NULL)? |
6729cf78 | 1819 | addr2.user_message : addr2.message; |
059ec3d9 PH |
1820 | *basic_errno = addr2.basic_errno; |
1821 | ||
1822 | /* Make $address_data visible */ | |
1823 | deliver_address_data = addr2.p.address_data; | |
1824 | } | |
1825 | ||
1826 | /* We have a result from the relevant test. Handle defer overrides first. */ | |
1827 | ||
1828 | if (rc == DEFER && (defer_ok || | |
1829 | (callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER))) | |
1830 | { | |
1831 | HDEBUG(D_acl) debug_printf("verify defer overridden by %s\n", | |
1832 | defer_ok? "defer_ok" : "callout_defer_ok"); | |
1833 | rc = OK; | |
1834 | } | |
1835 | ||
1836 | /* If we've failed a sender, set up a recipient message, and point | |
1837 | sender_verified_failed to the address item that actually failed. */ | |
1838 | ||
1839 | if (rc != OK && verify_sender_address != NULL) | |
1840 | { | |
1841 | if (rc != DEFER) | |
1842 | { | |
1843 | *log_msgptr = *user_msgptr = US"Sender verify failed"; | |
1844 | } | |
1845 | else if (*basic_errno != ERRNO_CALLOUTDEFER) | |
1846 | { | |
1847 | *log_msgptr = *user_msgptr = US"Could not complete sender verify"; | |
1848 | } | |
1849 | else | |
1850 | { | |
1851 | *log_msgptr = US"Could not complete sender verify callout"; | |
1852 | *user_msgptr = smtp_return_error_details? sender_vaddr->user_message : | |
1853 | *log_msgptr; | |
1854 | } | |
1855 | ||
1856 | sender_verified_failed = sender_vaddr; | |
1857 | } | |
1858 | ||
1859 | /* Verifying an address messes up the values of $domain and $local_part, | |
1860 | so reset them before returning if this is a RCPT ACL. */ | |
1861 | ||
1862 | if (addr != NULL) | |
1863 | { | |
1864 | deliver_domain = addr->domain; | |
1865 | deliver_localpart = addr->local_part; | |
1866 | } | |
1867 | return rc; | |
1868 | ||
1869 | /* Syntax errors in the verify argument come here. */ | |
1870 | ||
1871 | BAD_VERIFY: | |
1872 | *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", " | |
596875b3 PH |
1873 | "\"helo\", \"header_syntax\", \"header_sender\" or " |
1874 | "\"reverse_host_lookup\" at start of ACL condition " | |
059ec3d9 PH |
1875 | "\"verify %s\"", arg); |
1876 | return ERROR; | |
596875b3 PH |
1877 | |
1878 | /* Options supplied when not allowed come here */ | |
1879 | ||
1880 | NO_OPTIONS: | |
1881 | *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" " | |
1882 | "(this verify item has no options)", arg); | |
1883 | return ERROR; | |
1c41c9cc PH |
1884 | |
1885 | /* Calls in the wrong ACL come here */ | |
1886 | ||
1887 | WRONG_ACL: | |
1888 | *log_msgptr = string_sprintf("cannot check header contents in ACL for %s " | |
1889 | "(only possible in ACL for DATA)", acl_wherenames[where]); | |
1890 | return ERROR; | |
059ec3d9 PH |
1891 | } |
1892 | ||
1893 | ||
1894 | ||
1895 | ||
1896 | /************************************************* | |
1897 | * Check argument for control= modifier * | |
1898 | *************************************************/ | |
1899 | ||
1900 | /* Called from acl_check_condition() below | |
1901 | ||
1902 | Arguments: | |
1903 | arg the argument string for control= | |
1904 | pptr set to point to the terminating character | |
1905 | where which ACL we are in | |
1906 | log_msgptr for error messages | |
1907 | ||
1908 | Returns: CONTROL_xxx value | |
1909 | */ | |
1910 | ||
1911 | static int | |
1912 | decode_control(uschar *arg, uschar **pptr, int where, uschar **log_msgptr) | |
1913 | { | |
1914 | int len; | |
1915 | control_def *d; | |
1916 | ||
1917 | for (d = controls_list; | |
1918 | d < controls_list + sizeof(controls_list)/sizeof(control_def); | |
1919 | d++) | |
1920 | { | |
1921 | len = Ustrlen(d->name); | |
1922 | if (Ustrncmp(d->name, arg, len) == 0) break; | |
1923 | } | |
1924 | ||
1925 | if (d >= controls_list + sizeof(controls_list)/sizeof(control_def) || | |
1926 | (arg[len] != 0 && (!d->has_option || arg[len] != '/'))) | |
1927 | { | |
1928 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
1929 | return CONTROL_ERROR; | |
1930 | } | |
1931 | ||
059ec3d9 PH |
1932 | *pptr = arg + len; |
1933 | return d->value; | |
1934 | } | |
1935 | ||
1936 | ||
1937 | ||
870f6ba8 TF |
1938 | /************************************************* |
1939 | * Handle rate limiting * | |
1940 | *************************************************/ | |
1941 | ||
1942 | /* Called by acl_check_condition() below to calculate the result | |
1943 | of the ACL ratelimit condition. | |
1944 | ||
1945 | Note that the return value might be slightly unexpected: if the | |
1946 | sender's rate is above the limit then the result is OK. This is | |
1947 | similar to the dnslists condition, and is so that you can write | |
1948 | ACL clauses like: defer ratelimit = 15 / 1h | |
1949 | ||
1950 | Arguments: | |
1951 | arg the option string for ratelimit= | |
1952 | log_msgptr for error messages | |
1953 | ||
1954 | Returns: OK - Sender's rate is above limit | |
1955 | FAIL - Sender's rate is below limit | |
1956 | DEFER - Problem opening ratelimit database | |
1957 | ERROR - Syntax error in options. | |
1958 | */ | |
1959 | ||
1960 | static int | |
1961 | acl_ratelimit(uschar *arg, uschar **log_msgptr) | |
1962 | { | |
1963 | double limit, period; | |
f3dcf4a2 | 1964 | uschar *ss, *key; |
870f6ba8 TF |
1965 | int sep = '/'; |
1966 | BOOL have_key = FALSE, leaky = FALSE, strict = FALSE; | |
1967 | BOOL per_byte = FALSE, per_cmd = FALSE, per_conn = FALSE, per_mail = FALSE; | |
1968 | int old_pool, rc; | |
1969 | tree_node **anchor, *t; | |
1970 | open_db dbblock, *dbm; | |
1971 | dbdata_ratelimit *dbd; | |
1972 | struct timeval tv; | |
1973 | ||
1974 | /* Parse the first two options and record their values in expansion | |
1975 | variables. These variables allow the configuration to have informative | |
1976 | error messages based on rate limits obtained from a table lookup. */ | |
1977 | ||
1978 | /* First is the maximum number of messages per period and maximum burst | |
1979 | size, which must be greater than or equal to zero. Zero is useful for | |
1980 | rate measurement as opposed to rate limiting. */ | |
1981 | ||
1982 | sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0); | |
1983 | if (sender_rate_limit == NULL) | |
1984 | limit = -1.0; | |
1985 | else | |
1986 | { | |
1987 | limit = Ustrtod(sender_rate_limit, &ss); | |
1988 | if (tolower(*ss) == 'k') { limit *= 1024.0; ss++; } | |
1989 | else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; } | |
1990 | else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; } | |
1991 | } | |
1992 | if (limit < 0.0 || *ss != 0) | |
1993 | { | |
1994 | *log_msgptr = string_sprintf("syntax error in argument for " | |
1995 | "\"ratelimit\" condition: \"%s\" is not a positive number", | |
1996 | sender_rate_limit); | |
1997 | return ERROR; | |
1998 | } | |
1999 | ||
f3dcf4a2 TF |
2000 | /* We use the rest of the argument list following the limit as the |
2001 | lookup key, because it doesn't make sense to use the same stored data | |
2002 | if the period or options are different. */ | |
2003 | ||
2004 | key = arg; | |
2005 | ||
870f6ba8 TF |
2006 | /* Second is the rate measurement period and exponential smoothing time |
2007 | constant. This must be strictly greater than zero, because zero leads to | |
2008 | run-time division errors. */ | |
2009 | ||
2010 | sender_rate_period = string_nextinlist(&arg, &sep, NULL, 0); | |
2011 | if (sender_rate_period == NULL) period = -1.0; | |
2012 | else period = readconf_readtime(sender_rate_period, 0, FALSE); | |
2013 | if (period <= 0.0) | |
2014 | { | |
2015 | *log_msgptr = string_sprintf("syntax error in argument for " | |
2016 | "\"ratelimit\" condition: \"%s\" is not a time value", | |
2017 | sender_rate_period); | |
2018 | return ERROR; | |
2019 | } | |
2020 | ||
2021 | /* Parse the other options. Should we check if the per_* options are being | |
2022 | used in ACLs where they don't make sense, e.g. per_mail in the connect ACL? */ | |
2023 | ||
2024 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2025 | != NULL) | |
2026 | { | |
2027 | if (strcmpic(ss, US"leaky") == 0) leaky = TRUE; | |
2028 | else if (strcmpic(ss, US"strict") == 0) strict = TRUE; | |
2029 | else if (strcmpic(ss, US"per_byte") == 0) per_byte = TRUE; | |
2030 | else if (strcmpic(ss, US"per_cmd") == 0) per_cmd = TRUE; | |
2031 | else if (strcmpic(ss, US"per_conn") == 0) per_conn = TRUE; | |
2032 | else if (strcmpic(ss, US"per_mail") == 0) per_mail = TRUE; | |
2033 | else if (strcmpic(ss, US"per_rcpt") == 0) per_cmd = TRUE; /* alias */ | |
2034 | else have_key = TRUE; | |
2035 | } | |
2036 | if (leaky + strict > 1 || per_byte + per_cmd + per_conn + per_mail > 1) | |
2037 | { | |
2038 | *log_msgptr = US"conflicting options for \"ratelimit\" condition"; | |
2039 | return ERROR; | |
2040 | } | |
2041 | ||
2042 | /* Default option values */ | |
2043 | if (!strict) leaky = TRUE; | |
2044 | if (!per_byte && !per_cmd && !per_conn) per_mail = TRUE; | |
2045 | ||
f3dcf4a2 | 2046 | /* If there is no explicit key, use the sender_host_address. If there is no |
870f6ba8 TF |
2047 | sender_host_address (e.g. -bs or acl_not_smtp) then we simply omit it. */ |
2048 | ||
2049 | if (!have_key && sender_host_address != NULL) | |
2050 | key = string_sprintf("%s / %s", key, sender_host_address); | |
2051 | ||
2052 | HDEBUG(D_acl) debug_printf("ratelimit condition limit=%.0f period=%.0f key=%s\n", | |
2053 | limit, period, key); | |
2054 | ||
fe0dab11 | 2055 | /* See if we have already computed the rate by looking in the relevant tree. For |
870f6ba8 TF |
2056 | per-connection rate limiting, store tree nodes and dbdata in the permanent pool |
2057 | so that they survive across resets. */ | |
2058 | ||
2059 | anchor = NULL; | |
2060 | old_pool = store_pool; | |
2061 | ||
2062 | if (per_conn) | |
2063 | { | |
2064 | anchor = &ratelimiters_conn; | |
2065 | store_pool = POOL_PERM; | |
2066 | } | |
fe0dab11 | 2067 | else if (per_mail || per_byte) |
870f6ba8 | 2068 | anchor = &ratelimiters_mail; |
fe0dab11 TF |
2069 | else if (per_cmd) |
2070 | anchor = &ratelimiters_cmd; | |
870f6ba8 TF |
2071 | |
2072 | if (anchor != NULL && (t = tree_search(*anchor, key)) != NULL) | |
2073 | { | |
2074 | dbd = t->data.ptr; | |
2075 | /* The following few lines duplicate some of the code below. */ | |
3348576f TF |
2076 | if (dbd->rate < limit) rc = FAIL; |
2077 | else rc = OK; | |
870f6ba8 TF |
2078 | store_pool = old_pool; |
2079 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2080 | HDEBUG(D_acl) | |
2081 | debug_printf("ratelimit found pre-computed rate %s\n", sender_rate); | |
2082 | return rc; | |
2083 | } | |
2084 | ||
2085 | /* We aren't using a pre-computed rate, so get a previously recorded | |
2086 | rate from the database, update it, and write it back. If there's no | |
2087 | previous rate for this key, create one. */ | |
2088 | ||
2089 | dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE); | |
2090 | if (dbm == NULL) | |
2091 | { | |
2092 | store_pool = old_pool; | |
2093 | sender_rate = NULL; | |
2094 | HDEBUG(D_acl) debug_printf("ratelimit database not available\n"); | |
2095 | *log_msgptr = US"ratelimit database not available"; | |
2096 | return DEFER; | |
2097 | } | |
2098 | dbd = dbfn_read(dbm, key); | |
2099 | ||
2100 | gettimeofday(&tv, NULL); | |
2101 | ||
2102 | if (dbd == NULL) | |
2103 | { | |
2104 | HDEBUG(D_acl) debug_printf("ratelimit initializing new key's data\n"); | |
2105 | dbd = store_get(sizeof(dbdata_ratelimit)); | |
2106 | dbd->time_stamp = tv.tv_sec; | |
2107 | dbd->time_usec = tv.tv_usec; | |
2108 | dbd->rate = 0.0; | |
2109 | } | |
2110 | else | |
2111 | { | |
2112 | /* The smoothed rate is computed using an exponentially weighted moving | |
2113 | average adjusted for variable sampling intervals. The standard EWMA for | |
2114 | a fixed sampling interval is: f'(t) = (1 - a) * f(t) + a * f'(t - 1) | |
2115 | where f() is the measured value and f'() is the smoothed value. | |
2116 | ||
2117 | Old data decays out of the smoothed value exponentially, such that data n | |
2118 | samples old is multiplied by a^n. The exponential decay time constant p | |
2119 | is defined such that data p samples old is multiplied by 1/e, which means | |
2120 | that a = exp(-1/p). We can maintain the same time constant for a variable | |
2121 | sampling interval i by using a = exp(-i/p). | |
2122 | ||
2123 | The rate we are measuring is messages per period, suitable for directly | |
2124 | comparing with the limit. The average rate between now and the previous | |
2125 | message is period / interval, which we feed into the EWMA as the sample. | |
2126 | ||
2127 | It turns out that the number of messages required for the smoothed rate | |
2128 | to reach the limit when they are sent in a burst is equal to the limit. | |
2129 | This can be seen by analysing the value of the smoothed rate after N | |
2130 | messages sent at even intervals. Let k = (1 - a) * p/i | |
2131 | ||
2132 | rate_1 = (1 - a) * p/i + a * rate_0 | |
2133 | = k + a * rate_0 | |
2134 | rate_2 = k + a * rate_1 | |
2135 | = k + a * k + a^2 * rate_0 | |
2136 | rate_3 = k + a * k + a^2 * k + a^3 * rate_0 | |
2137 | rate_N = rate_0 * a^N + k * SUM(x=0..N-1)(a^x) | |
2138 | = rate_0 * a^N + k * (1 - a^N) / (1 - a) | |
2139 | = rate_0 * a^N + p/i * (1 - a^N) | |
2140 | ||
2141 | When N is large, a^N -> 0 so rate_N -> p/i as desired. | |
2142 | ||
2143 | rate_N = p/i + (rate_0 - p/i) * a^N | |
2144 | a^N = (rate_N - p/i) / (rate_0 - p/i) | |
2145 | N * -i/p = log((rate_N - p/i) / (rate_0 - p/i)) | |
2146 | N = p/i * log((rate_0 - p/i) / (rate_N - p/i)) | |
2147 | ||
2148 | Numerical analysis of the above equation, setting the computed rate to | |
2149 | increase from rate_0 = 0 to rate_N = limit, shows that for large sending | |
2150 | rates, p/i, the number of messages N = limit. So limit serves as both the | |
2151 | maximum rate measured in messages per period, and the maximum number of | |
2152 | messages that can be sent in a fast burst. */ | |
2153 | ||
2154 | double this_time = (double)tv.tv_sec | |
2155 | + (double)tv.tv_usec / 1000000.0; | |
2156 | double prev_time = (double)dbd->time_stamp | |
2157 | + (double)dbd->time_usec / 1000000.0; | |
2158 | double interval = this_time - prev_time; | |
2159 | ||
2160 | double i_over_p = interval / period; | |
2161 | double a = exp(-i_over_p); | |
2162 | ||
2163 | /* We must avoid division by zero, and deal gracefully with the clock going | |
2164 | backwards. If we blunder ahead when time is in reverse then the computed | |
2165 | rate will become bogusly huge. Clamp i/p to a very small number instead. */ | |
2166 | ||
2167 | if (i_over_p <= 0.0) i_over_p = 1e-9; | |
2168 | ||
2169 | dbd->time_stamp = tv.tv_sec; | |
2170 | dbd->time_usec = tv.tv_usec; | |
2171 | ||
2172 | /* If we are measuring the rate in bytes per period, multiply the | |
2173 | measured rate by the message size. If we don't know the message size | |
2174 | then it's safe to just use a value of zero and let the recorded rate | |
2175 | decay as if nothing happened. */ | |
2176 | ||
2177 | if (per_byte) | |
2178 | dbd->rate = (message_size < 0 ? 0.0 : (double)message_size) | |
2179 | * (1 - a) / i_over_p + a * dbd->rate; | |
2180 | else | |
2181 | dbd->rate = (1 - a) / i_over_p + a * dbd->rate; | |
2182 | } | |
2183 | ||
3348576f TF |
2184 | /* Clients sending at the limit are considered to be over the limit. This |
2185 | matters for edge cases such the first message sent by a client (which gets | |
2186 | the initial rate of 0.0) when the rate limit is zero (i.e. the client should | |
2187 | be completely blocked). */ | |
2188 | ||
2189 | if (dbd->rate < limit) rc = FAIL; | |
2190 | else rc = OK; | |
870f6ba8 TF |
2191 | |
2192 | /* Update the state if the rate is low or if we are being strict. If we | |
2193 | are in leaky mode and the sender's rate is too high, we do not update | |
2194 | the recorded rate in order to avoid an over-aggressive sender's retry | |
2195 | rate preventing them from getting any email through. */ | |
2196 | ||
2197 | if (rc == FAIL || !leaky) | |
2198 | dbfn_write(dbm, key, dbd, sizeof(dbdata_ratelimit)); | |
2199 | dbfn_close(dbm); | |
2200 | ||
2201 | /* Store the result in the tree for future reference, if necessary. */ | |
2202 | ||
2203 | if (anchor != NULL) | |
2204 | { | |
2205 | t = store_get(sizeof(tree_node) + Ustrlen(key)); | |
2206 | t->data.ptr = dbd; | |
2207 | Ustrcpy(t->name, key); | |
2208 | (void)tree_insertnode(anchor, t); | |
2209 | } | |
2210 | ||
2211 | /* We create the formatted version of the sender's rate very late in | |
2212 | order to ensure that it is done using the correct storage pool. */ | |
2213 | ||
2214 | store_pool = old_pool; | |
2215 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2216 | ||
2217 | HDEBUG(D_acl) | |
2218 | debug_printf("ratelimit computed rate %s\n", sender_rate); | |
2219 | ||
2220 | return rc; | |
2221 | } | |
2222 | ||
2223 | ||
2224 | ||
059ec3d9 PH |
2225 | /************************************************* |
2226 | * Handle conditions/modifiers on an ACL item * | |
2227 | *************************************************/ | |
2228 | ||
2229 | /* Called from acl_check() below. | |
2230 | ||
2231 | Arguments: | |
2232 | verb ACL verb | |
2233 | cb ACL condition block - if NULL, result is OK | |
2234 | where where called from | |
2235 | addr the address being checked for RCPT, or NULL | |
2236 | level the nesting level | |
2237 | epp pointer to pass back TRUE if "endpass" encountered | |
2238 | (applies only to "accept" and "discard") | |
2239 | user_msgptr user message pointer | |
2240 | log_msgptr log message pointer | |
2241 | basic_errno pointer to where to put verify error | |
2242 | ||
2243 | Returns: OK - all conditions are met | |
2244 | DISCARD - an "acl" condition returned DISCARD - only allowed | |
2245 | for "accept" or "discard" verbs | |
2246 | FAIL - at least one condition fails | |
2247 | FAIL_DROP - an "acl" condition returned FAIL_DROP | |
2248 | DEFER - can't tell at the moment (typically, lookup defer, | |
2249 | but can be temporary callout problem) | |
2250 | ERROR - ERROR from nested ACL or expansion failure or other | |
2251 | error | |
2252 | */ | |
2253 | ||
2254 | static int | |
2255 | acl_check_condition(int verb, acl_condition_block *cb, int where, | |
2256 | address_item *addr, int level, BOOL *epp, uschar **user_msgptr, | |
2257 | uschar **log_msgptr, int *basic_errno) | |
2258 | { | |
2259 | uschar *user_message = NULL; | |
2260 | uschar *log_message = NULL; | |
2261 | uschar *p; | |
2262 | int rc = OK; | |
8523533c TK |
2263 | #ifdef WITH_CONTENT_SCAN |
2264 | int sep = '/'; | |
2265 | #endif | |
059ec3d9 PH |
2266 | |
2267 | for (; cb != NULL; cb = cb->next) | |
2268 | { | |
2269 | uschar *arg; | |
8e669ac1 | 2270 | int control_type; |
059ec3d9 PH |
2271 | |
2272 | /* The message and log_message items set up messages to be used in | |
2273 | case of rejection. They are expanded later. */ | |
2274 | ||
2275 | if (cb->type == ACLC_MESSAGE) | |
2276 | { | |
2277 | user_message = cb->arg; | |
2278 | continue; | |
2279 | } | |
2280 | ||
2281 | if (cb->type == ACLC_LOG_MESSAGE) | |
2282 | { | |
2283 | log_message = cb->arg; | |
2284 | continue; | |
2285 | } | |
2286 | ||
2287 | /* The endpass "condition" just sets a flag to show it occurred. This is | |
2288 | checked at compile time to be on an "accept" or "discard" item. */ | |
2289 | ||
2290 | if (cb->type == ACLC_ENDPASS) | |
2291 | { | |
2292 | *epp = TRUE; | |
2293 | continue; | |
2294 | } | |
2295 | ||
2296 | /* For other conditions and modifiers, the argument is expanded now for some | |
2297 | of them, but not for all, because expansion happens down in some lower level | |
2298 | checking functions in some cases. */ | |
2299 | ||
2300 | if (cond_expand_at_top[cb->type]) | |
2301 | { | |
2302 | arg = expand_string(cb->arg); | |
2303 | if (arg == NULL) | |
2304 | { | |
2305 | if (expand_string_forcedfail) continue; | |
2306 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
2307 | cb->arg, expand_string_message); | |
2308 | return search_find_defer? DEFER : ERROR; | |
2309 | } | |
2310 | } | |
2311 | else arg = cb->arg; | |
2312 | ||
2313 | /* Show condition, and expanded condition if it's different */ | |
2314 | ||
2315 | HDEBUG(D_acl) | |
2316 | { | |
2317 | int lhswidth = 0; | |
2318 | debug_printf("check %s%s %n", | |
2319 | (!cond_modifiers[cb->type] && cb->u.negated)? "!":"", | |
2320 | conditions[cb->type], &lhswidth); | |
2321 | ||
2322 | if (cb->type == ACLC_SET) | |
2323 | { | |
2324 | int n = cb->u.varnumber; | |
2325 | int t = (n < ACL_C_MAX)? 'c' : 'm'; | |
2326 | if (n >= ACL_C_MAX) n -= ACL_C_MAX; | |
2327 | debug_printf("acl_%c%d ", t, n); | |
2328 | lhswidth += 7; | |
2329 | } | |
2330 | ||
2331 | debug_printf("= %s\n", cb->arg); | |
2332 | ||
2333 | if (arg != cb->arg) | |
2334 | debug_printf("%.*s= %s\n", lhswidth, | |
2335 | US" ", CS arg); | |
2336 | } | |
2337 | ||
2338 | /* Check that this condition makes sense at this time */ | |
2339 | ||
2340 | if ((cond_forbids[cb->type] & (1 << where)) != 0) | |
2341 | { | |
2342 | *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL", | |
2343 | cond_modifiers[cb->type]? "use" : "test", | |
2344 | conditions[cb->type], acl_wherenames[where]); | |
2345 | return ERROR; | |
2346 | } | |
2347 | ||
2348 | /* Run the appropriate test for each condition, or take the appropriate | |
2349 | action for the remaining modifiers. */ | |
2350 | ||
2351 | switch(cb->type) | |
2352 | { | |
2353 | /* A nested ACL that returns "discard" makes sense only for an "accept" or | |
2354 | "discard" verb. */ | |
2355 | ||
2356 | case ACLC_ACL: | |
2357 | rc = acl_check_internal(where, addr, arg, level+1, user_msgptr, log_msgptr); | |
2358 | if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD) | |
2359 | { | |
2360 | *log_msgptr = string_sprintf("nested ACL returned \"discard\" for " | |
2361 | "\"%s\" command (only allowed with \"accept\" or \"discard\")", | |
2362 | verbs[verb]); | |
2363 | return ERROR; | |
2364 | } | |
2365 | break; | |
2366 | ||
2367 | case ACLC_AUTHENTICATED: | |
2368 | rc = (sender_host_authenticated == NULL)? FAIL : | |
2369 | match_isinlist(sender_host_authenticated, &arg, 0, NULL, NULL, MCL_STRING, | |
2370 | TRUE, NULL); | |
2371 | break; | |
2372 | ||
8523533c TK |
2373 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
2374 | case ACLC_BMI_OPTIN: | |
2375 | { | |
2376 | int old_pool = store_pool; | |
2377 | store_pool = POOL_PERM; | |
2378 | bmi_current_optin = string_copy(arg); | |
2379 | store_pool = old_pool; | |
2380 | } | |
2381 | break; | |
2382 | #endif | |
2383 | ||
059ec3d9 PH |
2384 | case ACLC_CONDITION: |
2385 | if (Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */ | |
2386 | rc = (Uatoi(arg) == 0)? FAIL : OK; | |
2387 | else | |
2388 | rc = (strcmpic(arg, US"no") == 0 || | |
2389 | strcmpic(arg, US"false") == 0)? FAIL : | |
2390 | (strcmpic(arg, US"yes") == 0 || | |
2391 | strcmpic(arg, US"true") == 0)? OK : DEFER; | |
2392 | if (rc == DEFER) | |
2393 | *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg); | |
2394 | break; | |
2395 | ||
2396 | case ACLC_CONTROL: | |
c5fcb476 PH |
2397 | control_type = decode_control(arg, &p, where, log_msgptr); |
2398 | ||
8523533c | 2399 | /* Check if this control makes sense at this time */ |
c5fcb476 PH |
2400 | |
2401 | if ((control_forbids[control_type] & (1 << where)) != 0) | |
2402 | { | |
2403 | *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL", | |
2404 | controls[control_type], acl_wherenames[where]); | |
2405 | return ERROR; | |
8e669ac1 | 2406 | } |
c5fcb476 PH |
2407 | |
2408 | switch(control_type) | |
059ec3d9 | 2409 | { |
8523533c TK |
2410 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
2411 | case CONTROL_BMI_RUN: | |
2412 | bmi_run = 1; | |
2413 | break; | |
2414 | #endif | |
fb2274d4 TK |
2415 | #ifdef EXPERIMENTAL_DOMAINKEYS |
2416 | case CONTROL_DK_VERIFY: | |
2417 | dk_do_verify = 1; | |
2418 | break; | |
2419 | #endif | |
059ec3d9 PH |
2420 | case CONTROL_ERROR: |
2421 | return ERROR; | |
2422 | ||
2423 | case CONTROL_CASEFUL_LOCAL_PART: | |
2424 | deliver_localpart = addr->cc_local_part; | |
2425 | break; | |
2426 | ||
2427 | case CONTROL_CASELOWER_LOCAL_PART: | |
2428 | deliver_localpart = addr->lc_local_part; | |
2429 | break; | |
2430 | ||
2431 | case CONTROL_ENFORCE_SYNC: | |
2432 | smtp_enforce_sync = TRUE; | |
2433 | break; | |
2434 | ||
2435 | case CONTROL_NO_ENFORCE_SYNC: | |
2436 | smtp_enforce_sync = FALSE; | |
2437 | break; | |
2438 | ||
8523533c TK |
2439 | #ifdef WITH_CONTENT_SCAN |
2440 | case CONTROL_NO_MBOX_UNSPOOL: | |
2441 | no_mbox_unspool = TRUE; | |
2442 | break; | |
2443 | #endif | |
2444 | ||
059ec3d9 PH |
2445 | case CONTROL_NO_MULTILINE: |
2446 | no_multiline_responses = TRUE; | |
2447 | break; | |
2448 | ||
29aba418 | 2449 | case CONTROL_FAKEDEFER: |
8523533c | 2450 | case CONTROL_FAKEREJECT: |
29aba418 | 2451 | fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL; |
8523533c | 2452 | if (*p == '/') |
8e669ac1 | 2453 | { |
8523533c | 2454 | uschar *pp = p + 1; |
8e669ac1 | 2455 | while (*pp != 0) pp++; |
29aba418 | 2456 | fake_response_text = expand_string(string_copyn(p+1, pp-p-1)); |
8523533c TK |
2457 | p = pp; |
2458 | } | |
2459 | else | |
2460 | { | |
2461 | /* Explicitly reset to default string */ | |
29aba418 | 2462 | 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 |
2463 | } |
2464 | break; | |
8523533c | 2465 | |
059ec3d9 PH |
2466 | case CONTROL_FREEZE: |
2467 | deliver_freeze = TRUE; | |
2468 | deliver_frozen_at = time(NULL); | |
2469 | break; | |
2470 | ||
2471 | case CONTROL_QUEUE_ONLY: | |
2472 | queue_only_policy = TRUE; | |
2473 | break; | |
2474 | ||
2475 | case CONTROL_SUBMISSION: | |
87ba3f5f | 2476 | originator_name = US""; |
059ec3d9 | 2477 | submission_mode = TRUE; |
69358f02 | 2478 | while (*p == '/') |
8e669ac1 | 2479 | { |
69358f02 PH |
2480 | if (Ustrncmp(p, "/sender_retain", 14) == 0) |
2481 | { | |
2482 | p += 14; | |
2483 | active_local_sender_retain = TRUE; | |
8e669ac1 PH |
2484 | active_local_from_check = FALSE; |
2485 | } | |
69358f02 PH |
2486 | else if (Ustrncmp(p, "/domain=", 8) == 0) |
2487 | { | |
2488 | uschar *pp = p + 8; | |
8e669ac1 | 2489 | while (*pp != 0 && *pp != '/') pp++; |
87ba3f5f PH |
2490 | submission_domain = string_copyn(p+8, pp-p-8); |
2491 | p = pp; | |
2492 | } | |
2493 | else if (Ustrncmp(p, "/name=", 6) == 0) | |
2494 | { | |
2495 | uschar *pp = p + 6; | |
2496 | while (*pp != 0 && *pp != '/') pp++; | |
2fe1a124 | 2497 | submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6, |
87ba3f5f | 2498 | big_buffer, big_buffer_size)); |
8e669ac1 | 2499 | p = pp; |
69358f02 | 2500 | } |
8e669ac1 PH |
2501 | else break; |
2502 | } | |
69358f02 | 2503 | if (*p != 0) |
059ec3d9 | 2504 | { |
69358f02 | 2505 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); |
059ec3d9 PH |
2506 | return ERROR; |
2507 | } | |
2508 | break; | |
2509 | } | |
2510 | break; | |
2511 | ||
8523533c TK |
2512 | #ifdef WITH_CONTENT_SCAN |
2513 | case ACLC_DECODE: | |
2514 | rc = mime_decode(&arg); | |
2515 | break; | |
2516 | #endif | |
2517 | ||
059ec3d9 PH |
2518 | case ACLC_DELAY: |
2519 | { | |
2520 | int delay = readconf_readtime(arg, 0, FALSE); | |
2521 | if (delay < 0) | |
2522 | { | |
2523 | *log_msgptr = string_sprintf("syntax error in argument for \"delay\" " | |
2524 | "modifier: \"%s\" is not a time value", arg); | |
2525 | return ERROR; | |
2526 | } | |
2527 | else | |
2528 | { | |
2529 | HDEBUG(D_acl) debug_printf("delay modifier requests %d-second delay\n", | |
2530 | delay); | |
2531 | if (host_checking) | |
2532 | { | |
2533 | HDEBUG(D_acl) | |
2534 | debug_printf("delay skipped in -bh checking mode\n"); | |
2535 | } | |
010c2d14 PH |
2536 | |
2537 | /* It appears to be impossible to detect that a TCP/IP connection has | |
2538 | gone away without reading from it. This means that we cannot shorten | |
2539 | the delay below if the client goes away, because we cannot discover | |
2540 | that the client has closed its end of the connection. (The connection | |
2541 | is actually in a half-closed state, waiting for the server to close its | |
2542 | end.) It would be nice to be able to detect this state, so that the | |
2543 | Exim process is not held up unnecessarily. However, it seems that we | |
2544 | can't. The poll() function does not do the right thing, and in any case | |
2545 | it is not always available. | |
2546 | ||
2547 | NOTE: If ever this state of affairs changes, remember that we may be | |
2548 | dealing with stdin/stdout here, in addition to TCP/IP connections. | |
2549 | Whatever is done must work in both cases. To detected the stdin/stdout | |
2550 | case, check for smtp_in or smtp_out being NULL. */ | |
2551 | ||
8e669ac1 | 2552 | else |
86b8287f PH |
2553 | { |
2554 | while (delay > 0) delay = sleep(delay); | |
8e669ac1 | 2555 | } |
059ec3d9 PH |
2556 | } |
2557 | } | |
2558 | break; | |
2559 | ||
8523533c TK |
2560 | #ifdef WITH_OLD_DEMIME |
2561 | case ACLC_DEMIME: | |
2562 | rc = demime(&arg); | |
2563 | break; | |
2564 | #endif | |
2565 | ||
fb2274d4 TK |
2566 | #ifdef EXPERIMENTAL_DOMAINKEYS |
2567 | case ACLC_DK_DOMAIN_SOURCE: | |
2568 | if (dk_verify_block == NULL) { rc = FAIL; break; }; | |
2569 | /* check header source of domain against given string */ | |
2570 | switch (dk_verify_block->address_source) { | |
2571 | case DK_EXIM_ADDRESS_FROM_FROM: | |
2572 | rc = match_isinlist(US"from", &arg, 0, NULL, | |
2573 | NULL, MCL_STRING, TRUE, NULL); | |
2574 | break; | |
2575 | case DK_EXIM_ADDRESS_FROM_SENDER: | |
2576 | rc = match_isinlist(US"sender", &arg, 0, NULL, | |
2577 | NULL, MCL_STRING, TRUE, NULL); | |
2578 | break; | |
2579 | case DK_EXIM_ADDRESS_NONE: | |
2580 | rc = match_isinlist(US"none", &arg, 0, NULL, | |
2581 | NULL, MCL_STRING, TRUE, NULL); | |
2582 | break; | |
2583 | } | |
2584 | break; | |
2585 | case ACLC_DK_POLICY: | |
2586 | if (dk_verify_block == NULL) { rc = FAIL; break; }; | |
2587 | /* check policy against given string, default FAIL */ | |
2588 | rc = FAIL; | |
2589 | if (dk_verify_block->signsall) | |
2590 | rc = match_isinlist(US"signsall", &arg, 0, NULL, | |
2591 | NULL, MCL_STRING, TRUE, NULL); | |
2592 | if (dk_verify_block->testing) | |
2593 | rc = match_isinlist(US"testing", &arg, 0, NULL, | |
2594 | NULL, MCL_STRING, TRUE, NULL); | |
2595 | break; | |
2596 | case ACLC_DK_SENDER_DOMAINS: | |
2597 | if (dk_verify_block == NULL) { rc = FAIL; break; }; | |
2598 | if (dk_verify_block->domain != NULL) | |
2599 | rc = match_isinlist(dk_verify_block->domain, &arg, 0, &domainlist_anchor, | |
2600 | NULL, MCL_DOMAIN, TRUE, NULL); | |
2601 | else rc = FAIL; | |
2602 | break; | |
2603 | case ACLC_DK_SENDER_LOCAL_PARTS: | |
2604 | if (dk_verify_block == NULL) { rc = FAIL; break; }; | |
2605 | if (dk_verify_block->local_part != NULL) | |
2606 | rc = match_isinlist(dk_verify_block->local_part, &arg, 0, &localpartlist_anchor, | |
2607 | NULL, MCL_LOCALPART, TRUE, NULL); | |
2608 | else rc = FAIL; | |
2609 | break; | |
2610 | case ACLC_DK_SENDERS: | |
2611 | if (dk_verify_block == NULL) { rc = FAIL; break; }; | |
2612 | if (dk_verify_block->address != NULL) | |
2613 | rc = match_address_list(dk_verify_block->address, TRUE, TRUE, &arg, NULL, -1, 0, NULL); | |
2614 | else rc = FAIL; | |
2615 | break; | |
2616 | case ACLC_DK_STATUS: | |
2617 | if (dk_verify_block == NULL) { rc = FAIL; break; }; | |
2618 | if (dk_verify_block->result > 0) { | |
2619 | switch(dk_verify_block->result) { | |
2620 | case DK_EXIM_RESULT_BAD_FORMAT: | |
2621 | rc = match_isinlist(US"bad format", &arg, 0, NULL, | |
2622 | NULL, MCL_STRING, TRUE, NULL); | |
2623 | break; | |
2624 | case DK_EXIM_RESULT_NO_KEY: | |
2625 | rc = match_isinlist(US"no key", &arg, 0, NULL, | |
2626 | NULL, MCL_STRING, TRUE, NULL); | |
2627 | break; | |
2628 | case DK_EXIM_RESULT_NO_SIGNATURE: | |
2629 | rc = match_isinlist(US"no signature", &arg, 0, NULL, | |
2630 | NULL, MCL_STRING, TRUE, NULL); | |
2631 | break; | |
2632 | case DK_EXIM_RESULT_REVOKED: | |
2633 | rc = match_isinlist(US"revoked", &arg, 0, NULL, | |
2634 | NULL, MCL_STRING, TRUE, NULL); | |
2635 | break; | |
2636 | case DK_EXIM_RESULT_NON_PARTICIPANT: | |
2637 | rc = match_isinlist(US"non-participant", &arg, 0, NULL, | |
2638 | NULL, MCL_STRING, TRUE, NULL); | |
2639 | break; | |
2640 | case DK_EXIM_RESULT_GOOD: | |
2641 | rc = match_isinlist(US"good", &arg, 0, NULL, | |
2642 | NULL, MCL_STRING, TRUE, NULL); | |
2643 | break; | |
2644 | case DK_EXIM_RESULT_BAD: | |
2645 | rc = match_isinlist(US"bad", &arg, 0, NULL, | |
2646 | NULL, MCL_STRING, TRUE, NULL); | |
2647 | break; | |
2648 | } | |
2649 | } | |
2650 | break; | |
2651 | #endif | |
2652 | ||
059ec3d9 PH |
2653 | case ACLC_DNSLISTS: |
2654 | rc = verify_check_dnsbl(&arg); | |
2655 | break; | |
2656 | ||
2657 | case ACLC_DOMAINS: | |
2658 | rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor, | |
2659 | addr->domain_cache, MCL_DOMAIN, TRUE, &deliver_domain_data); | |
2660 | break; | |
2661 | ||
2662 | /* The value in tls_cipher is the full cipher name, for example, | |
2663 | TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the | |
2664 | cipher names such as DES-CBC3-SHA. But program defensively. We don't know | |
2665 | what may in practice come out of the SSL library - which at the time of | |
2666 | writing is poorly documented. */ | |
2667 | ||
2668 | case ACLC_ENCRYPTED: | |
2669 | if (tls_cipher == NULL) rc = FAIL; else | |
2670 | { | |
2671 | uschar *endcipher = NULL; | |
2672 | uschar *cipher = Ustrchr(tls_cipher, ':'); | |
2673 | if (cipher == NULL) cipher = tls_cipher; else | |
2674 | { | |
2675 | endcipher = Ustrchr(++cipher, ':'); | |
2676 | if (endcipher != NULL) *endcipher = 0; | |
2677 | } | |
2678 | rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL); | |
2679 | if (endcipher != NULL) *endcipher = ':'; | |
2680 | } | |
2681 | break; | |
2682 | ||
2683 | /* Use verify_check_this_host() instead of verify_check_host() so that | |
2684 | we can pass over &host_data to catch any looked up data. Once it has been | |
2685 | set, it retains its value so that it's still there if another ACL verb | |
2686 | comes through here and uses the cache. However, we must put it into | |
2687 | permanent store in case it is also expected to be used in a subsequent | |
2688 | message in the same SMTP connection. */ | |
2689 | ||
2690 | case ACLC_HOSTS: | |
2691 | rc = verify_check_this_host(&arg, sender_host_cache, NULL, | |
2692 | (sender_host_address == NULL)? US"" : sender_host_address, &host_data); | |
2693 | if (host_data != NULL) host_data = string_copy_malloc(host_data); | |
2694 | break; | |
2695 | ||
2696 | case ACLC_LOCAL_PARTS: | |
2697 | rc = match_isinlist(addr->cc_local_part, &arg, 0, | |
2698 | &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE, | |
2699 | &deliver_localpart_data); | |
2700 | break; | |
2701 | ||
2702 | case ACLC_LOGWRITE: | |
2703 | { | |
2704 | int logbits = 0; | |
2705 | uschar *s = arg; | |
2706 | if (*s == ':') | |
2707 | { | |
2708 | s++; | |
2709 | while (*s != ':') | |
2710 | { | |
2711 | if (Ustrncmp(s, "main", 4) == 0) | |
2712 | { logbits |= LOG_MAIN; s += 4; } | |
2713 | else if (Ustrncmp(s, "panic", 5) == 0) | |
2714 | { logbits |= LOG_PANIC; s += 5; } | |
2715 | else if (Ustrncmp(s, "reject", 6) == 0) | |
2716 | { logbits |= LOG_REJECT; s += 6; } | |
2717 | else | |
2718 | { | |
2719 | logbits = LOG_MAIN|LOG_PANIC; | |
2720 | s = string_sprintf(":unknown log name in \"%s\" in " | |
2721 | "\"logwrite\" in %s ACL", arg, acl_wherenames[where]); | |
2722 | } | |
2723 | if (*s == ',') s++; | |
2724 | } | |
2725 | s++; | |
2726 | } | |
2727 | while (isspace(*s)) s++; | |
2728 | if (logbits == 0) logbits = LOG_MAIN; | |
2729 | log_write(0, logbits, "%s", string_printing(s)); | |
2730 | } | |
2731 | break; | |
8e669ac1 | 2732 | |
8523533c TK |
2733 | #ifdef WITH_CONTENT_SCAN |
2734 | case ACLC_MALWARE: | |
2735 | { | |
2736 | /* Seperate the regular expression and any optional parameters. */ | |
2737 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); | |
2738 | /* Run the malware backend. */ | |
2739 | rc = malware(&ss); | |
2740 | /* Modify return code based upon the existance of options. */ | |
2741 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2742 | != NULL) { | |
2743 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
2744 | { | |
2745 | /* FAIL so that the message is passed to the next ACL */ | |
2746 | rc = FAIL; | |
2747 | } | |
2748 | } | |
2749 | } | |
2750 | break; | |
2751 | ||
2752 | case ACLC_MIME_REGEX: | |
2753 | rc = mime_regex(&arg); | |
2754 | break; | |
2755 | #endif | |
059ec3d9 | 2756 | |
870f6ba8 TF |
2757 | case ACLC_RATELIMIT: |
2758 | rc = acl_ratelimit(arg, log_msgptr); | |
2759 | break; | |
2760 | ||
059ec3d9 PH |
2761 | case ACLC_RECIPIENTS: |
2762 | rc = match_address_list(addr->address, TRUE, TRUE, &arg, NULL, -1, 0, | |
2763 | &recipient_data); | |
2764 | break; | |
2765 | ||
8523533c TK |
2766 | #ifdef WITH_CONTENT_SCAN |
2767 | case ACLC_REGEX: | |
2768 | rc = regex(&arg); | |
2769 | break; | |
2770 | #endif | |
2771 | ||
059ec3d9 PH |
2772 | case ACLC_SENDER_DOMAINS: |
2773 | { | |
2774 | uschar *sdomain; | |
2775 | sdomain = Ustrrchr(sender_address, '@'); | |
2776 | sdomain = (sdomain == NULL)? US"" : sdomain + 1; | |
2777 | rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor, | |
2778 | sender_domain_cache, MCL_DOMAIN, TRUE, NULL); | |
2779 | } | |
2780 | break; | |
2781 | ||
2782 | case ACLC_SENDERS: | |
2783 | rc = match_address_list(sender_address, TRUE, TRUE, &arg, | |
2784 | sender_address_cache, -1, 0, &sender_data); | |
2785 | break; | |
2786 | ||
2787 | /* Connection variables must persist forever */ | |
2788 | ||
2789 | case ACLC_SET: | |
2790 | { | |
2791 | int old_pool = store_pool; | |
2792 | if (cb->u.varnumber < ACL_C_MAX) store_pool = POOL_PERM; | |
2793 | acl_var[cb->u.varnumber] = string_copy(arg); | |
2794 | store_pool = old_pool; | |
2795 | } | |
2796 | break; | |
2797 | ||
8523533c TK |
2798 | #ifdef WITH_CONTENT_SCAN |
2799 | case ACLC_SPAM: | |
2800 | { | |
2801 | /* Seperate the regular expression and any optional parameters. */ | |
2802 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); | |
2803 | /* Run the spam backend. */ | |
2804 | rc = spam(&ss); | |
2805 | /* Modify return code based upon the existance of options. */ | |
2806 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2807 | != NULL) { | |
2808 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
2809 | { | |
2810 | /* FAIL so that the message is passed to the next ACL */ | |
2811 | rc = FAIL; | |
2812 | } | |
2813 | } | |
2814 | } | |
2815 | break; | |
2816 | #endif | |
2817 | ||
2818 | #ifdef EXPERIMENTAL_SPF | |
2819 | case ACLC_SPF: | |
2820 | rc = spf_process(&arg, sender_address); | |
2821 | break; | |
2822 | #endif | |
2823 | ||
059ec3d9 PH |
2824 | /* If the verb is WARN, discard any user message from verification, because |
2825 | such messages are SMTP responses, not header additions. The latter come | |
475fe28a PH |
2826 | only from explicit "message" modifiers. However, put the user message into |
2827 | $acl_verify_message so it can be used in subsequent conditions or modifiers | |
2828 | (until something changes it). */ | |
059ec3d9 PH |
2829 | |
2830 | case ACLC_VERIFY: | |
2831 | rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno); | |
475fe28a | 2832 | acl_verify_message = *user_msgptr; |
059ec3d9 PH |
2833 | if (verb == ACL_WARN) *user_msgptr = NULL; |
2834 | break; | |
2835 | ||
2836 | default: | |
2837 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown " | |
2838 | "condition %d", cb->type); | |
2839 | break; | |
2840 | } | |
2841 | ||
2842 | /* If a condition was negated, invert OK/FAIL. */ | |
2843 | ||
2844 | if (!cond_modifiers[cb->type] && cb->u.negated) | |
2845 | { | |
2846 | if (rc == OK) rc = FAIL; | |
2847 | else if (rc == FAIL || rc == FAIL_DROP) rc = OK; | |
2848 | } | |
2849 | ||
2850 | if (rc != OK) break; /* Conditions loop */ | |
2851 | } | |
2852 | ||
2853 | ||
2854 | /* If the result is the one for which "message" and/or "log_message" are used, | |
2855 | handle the values of these options. Most verbs have but a single return for | |
2856 | which the messages are relevant, but for "discard", it's useful to have the log | |
2857 | message both when it succeeds and when it fails. Also, for an "accept" that | |
2858 | appears in a QUIT ACL, we want to handle the user message. Since only "accept" | |
2859 | and "warn" are permitted in that ACL, we don't need to test the verb. | |
2860 | ||
2861 | These modifiers act in different ways: | |
2862 | ||
2863 | "message" is a user message that will be included in an SMTP response. Unless | |
2864 | it is empty, it overrides any previously set user message. | |
2865 | ||
2866 | "log_message" is a non-user message, and it adds to any existing non-user | |
2867 | message that is already set. | |
2868 | ||
2869 | If there isn't a log message set, we make it the same as the user message. */ | |
2870 | ||
2871 | if (((rc == FAIL_DROP)? FAIL : rc) == msgcond[verb] || | |
2872 | (verb == ACL_DISCARD && rc == OK) || | |
2873 | (where == ACL_WHERE_QUIT)) | |
2874 | { | |
2875 | uschar *expmessage; | |
2876 | ||
2877 | /* If the verb is "warn", messages generated by conditions (verification or | |
2878 | nested ACLs) are discarded. Only messages specified at this level are used. | |
2879 | However, the value of an existing message is available in $acl_verify_message | |
2880 | during expansions. */ | |
2881 | ||
2882 | uschar *old_user_msgptr = *user_msgptr; | |
2883 | uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr; | |
2884 | ||
2885 | if (verb == ACL_WARN) *log_msgptr = *user_msgptr = NULL; | |
2886 | ||
2887 | if (user_message != NULL) | |
2888 | { | |
2889 | acl_verify_message = old_user_msgptr; | |
2890 | expmessage = expand_string(user_message); | |
2891 | if (expmessage == NULL) | |
2892 | { | |
2893 | if (!expand_string_forcedfail) | |
2894 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
2895 | user_message, expand_string_message); | |
2896 | } | |
2897 | else if (expmessage[0] != 0) *user_msgptr = expmessage; | |
2898 | } | |
2899 | ||
2900 | if (log_message != NULL) | |
2901 | { | |
2902 | acl_verify_message = old_log_msgptr; | |
2903 | expmessage = expand_string(log_message); | |
2904 | if (expmessage == NULL) | |
2905 | { | |
2906 | if (!expand_string_forcedfail) | |
2907 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
2908 | log_message, expand_string_message); | |
2909 | } | |
2910 | else if (expmessage[0] != 0) | |
2911 | { | |
2912 | *log_msgptr = (*log_msgptr == NULL)? expmessage : | |
2913 | string_sprintf("%s: %s", expmessage, *log_msgptr); | |
2914 | } | |
2915 | } | |
2916 | ||
2917 | /* If no log message, default it to the user message */ | |
2918 | ||
2919 | if (*log_msgptr == NULL) *log_msgptr = *user_msgptr; | |
2920 | } | |
2921 | ||
2922 | acl_verify_message = NULL; | |
2923 | return rc; | |
2924 | } | |
2925 | ||
2926 | ||
2927 | ||
2928 | ||
2929 | ||
2930 | /************************************************* | |
2931 | * Get line from a literal ACL * | |
2932 | *************************************************/ | |
2933 | ||
2934 | /* This function is passed to acl_read() in order to extract individual lines | |
2935 | of a literal ACL, which we access via static pointers. We can destroy the | |
2936 | contents because this is called only once (the compiled ACL is remembered). | |
2937 | ||
2938 | This code is intended to treat the data in the same way as lines in the main | |
2939 | Exim configuration file. That is: | |
2940 | ||
2941 | . Leading spaces are ignored. | |
2942 | ||
2943 | . A \ at the end of a line is a continuation - trailing spaces after the \ | |
2944 | are permitted (this is because I don't believe in making invisible things | |
2945 | significant). Leading spaces on the continued part of a line are ignored. | |
2946 | ||
2947 | . Physical lines starting (significantly) with # are totally ignored, and | |
2948 | may appear within a sequence of backslash-continued lines. | |
2949 | ||
2950 | . Blank lines are ignored, but will end a sequence of continuations. | |
2951 | ||
2952 | Arguments: none | |
2953 | Returns: a pointer to the next line | |
2954 | */ | |
2955 | ||
2956 | ||
2957 | static uschar *acl_text; /* Current pointer in the text */ | |
2958 | static uschar *acl_text_end; /* Points one past the terminating '0' */ | |
2959 | ||
2960 | ||
2961 | static uschar * | |
2962 | acl_getline(void) | |
2963 | { | |
2964 | uschar *yield; | |
2965 | ||
2966 | /* This loop handles leading blank lines and comments. */ | |
2967 | ||
2968 | for(;;) | |
2969 | { | |
2970 | while (isspace(*acl_text)) acl_text++; /* Leading spaces/empty lines */ | |
2971 | if (*acl_text == 0) return NULL; /* No more data */ | |
2972 | yield = acl_text; /* Potential data line */ | |
2973 | ||
2974 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
2975 | ||
2976 | /* If we hit the end before a newline, we have the whole logical line. If | |
2977 | it's a comment, there's no more data to be given. Otherwise, yield it. */ | |
2978 | ||
2979 | if (*acl_text == 0) return (*yield == '#')? NULL : yield; | |
2980 | ||
2981 | /* After reaching a newline, end this loop if the physical line does not | |
2982 | start with '#'. If it does, it's a comment, and the loop continues. */ | |
2983 | ||
2984 | if (*yield != '#') break; | |
2985 | } | |
2986 | ||
2987 | /* This loop handles continuations. We know we have some real data, ending in | |
2988 | newline. See if there is a continuation marker at the end (ignoring trailing | |
2989 | white space). We know that *yield is not white space, so no need to test for | |
2990 | cont > yield in the backwards scanning loop. */ | |
2991 | ||
2992 | for(;;) | |
2993 | { | |
2994 | uschar *cont; | |
2995 | for (cont = acl_text - 1; isspace(*cont); cont--); | |
2996 | ||
2997 | /* If no continuation follows, we are done. Mark the end of the line and | |
2998 | return it. */ | |
2999 | ||
3000 | if (*cont != '\\') | |
3001 | { | |
3002 | *acl_text++ = 0; | |
3003 | return yield; | |
3004 | } | |
3005 | ||
3006 | /* We have encountered a continuation. Skip over whitespace at the start of | |
3007 | the next line, and indeed the whole of the next line or lines if they are | |
3008 | comment lines. */ | |
3009 | ||
3010 | for (;;) | |
3011 | { | |
3012 | while (*(++acl_text) == ' ' || *acl_text == '\t'); | |
3013 | if (*acl_text != '#') break; | |
3014 | while (*(++acl_text) != 0 && *acl_text != '\n'); | |
3015 | } | |
3016 | ||
3017 | /* We have the start of a continuation line. Move all the rest of the data | |
3018 | to join onto the previous line, and then find its end. If the end is not a | |
3019 | newline, we are done. Otherwise loop to look for another continuation. */ | |
3020 | ||
3021 | memmove(cont, acl_text, acl_text_end - acl_text); | |
3022 | acl_text_end -= acl_text - cont; | |
3023 | acl_text = cont; | |
3024 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3025 | if (*acl_text == 0) return yield; | |
3026 | } | |
3027 | ||
3028 | /* Control does not reach here */ | |
3029 | } | |
3030 | ||
3031 | ||
3032 | ||
3033 | ||
3034 | ||
3035 | /************************************************* | |
3036 | * Check access using an ACL * | |
3037 | *************************************************/ | |
3038 | ||
3039 | /* This function is called from address_check. It may recurse via | |
3040 | acl_check_condition() - hence the use of a level to stop looping. The ACL is | |
3041 | passed as a string which is expanded. A forced failure implies no access check | |
3042 | is required. If the result is a single word, it is taken as the name of an ACL | |
3043 | which is sought in the global ACL tree. Otherwise, it is taken as literal ACL | |
3044 | text, complete with newlines, and parsed as such. In both cases, the ACL check | |
3045 | is then run. This function uses an auxiliary function for acl_read() to call | |
3046 | for reading individual lines of a literal ACL. This is acl_getline(), which | |
3047 | appears immediately above. | |
3048 | ||
3049 | Arguments: | |
3050 | where where called from | |
3051 | addr address item when called from RCPT; otherwise NULL | |
3052 | s the input string; NULL is the same as an empty ACL => DENY | |
3053 | level the nesting level | |
3054 | user_msgptr where to put a user error (for SMTP response) | |
3055 | log_msgptr where to put a logging message (not for SMTP response) | |
3056 | ||
3057 | Returns: OK access is granted | |
3058 | DISCARD access is apparently granted... | |
3059 | FAIL access is denied | |
3060 | FAIL_DROP access is denied; drop the connection | |
3061 | DEFER can't tell at the moment | |
3062 | ERROR disaster | |
3063 | */ | |
3064 | ||
3065 | static int | |
3066 | acl_check_internal(int where, address_item *addr, uschar *s, int level, | |
3067 | uschar **user_msgptr, uschar **log_msgptr) | |
3068 | { | |
3069 | int fd = -1; | |
3070 | acl_block *acl = NULL; | |
3071 | uschar *acl_name = US"inline ACL"; | |
3072 | uschar *ss; | |
3073 | ||
3074 | /* Catch configuration loops */ | |
3075 | ||
3076 | if (level > 20) | |
3077 | { | |
3078 | *log_msgptr = US"ACL nested too deep: possible loop"; | |
3079 | return ERROR; | |
3080 | } | |
3081 | ||
3082 | if (s == NULL) | |
3083 | { | |
3084 | HDEBUG(D_acl) debug_printf("ACL is NULL: implicit DENY\n"); | |
3085 | return FAIL; | |
3086 | } | |
3087 | ||
3088 | /* At top level, we expand the incoming string. At lower levels, it has already | |
3089 | been expanded as part of condition processing. */ | |
3090 | ||
3091 | if (level == 0) | |
3092 | { | |
3093 | ss = expand_string(s); | |
3094 | if (ss == NULL) | |
3095 | { | |
3096 | if (expand_string_forcedfail) return OK; | |
3097 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s, | |
3098 | expand_string_message); | |
3099 | return ERROR; | |
3100 | } | |
3101 | } | |
3102 | else ss = s; | |
3103 | ||
3104 | while (isspace(*ss))ss++; | |
3105 | ||
3106 | /* If we can't find a named ACL, the default is to parse it as an inline one. | |
3107 | (Unless it begins with a slash; non-existent files give rise to an error.) */ | |
3108 | ||
3109 | acl_text = ss; | |
3110 | ||
3111 | /* Handle the case of a string that does not contain any spaces. Look for a | |
3112 | named ACL among those read from the configuration, or a previously read file. | |
3113 | It is possible that the pointer to the ACL is NULL if the configuration | |
3114 | contains a name with no data. If not found, and the text begins with '/', | |
3115 | read an ACL from a file, and save it so it can be re-used. */ | |
3116 | ||
3117 | if (Ustrchr(ss, ' ') == NULL) | |
3118 | { | |
3119 | tree_node *t = tree_search(acl_anchor, ss); | |
3120 | if (t != NULL) | |
3121 | { | |
3122 | acl = (acl_block *)(t->data.ptr); | |
3123 | if (acl == NULL) | |
3124 | { | |
3125 | HDEBUG(D_acl) debug_printf("ACL \"%s\" is empty: implicit DENY\n", ss); | |
3126 | return FAIL; | |
3127 | } | |
3128 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
3129 | HDEBUG(D_acl) debug_printf("using ACL \"%s\"\n", ss); | |
3130 | } | |
3131 | ||
3132 | else if (*ss == '/') | |
3133 | { | |
3134 | struct stat statbuf; | |
3135 | fd = Uopen(ss, O_RDONLY, 0); | |
3136 | if (fd < 0) | |
3137 | { | |
3138 | *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss, | |
3139 | strerror(errno)); | |
3140 | return ERROR; | |
3141 | } | |
3142 | ||
3143 | if (fstat(fd, &statbuf) != 0) | |
3144 | { | |
3145 | *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss, | |
3146 | strerror(errno)); | |
3147 | return ERROR; | |
3148 | } | |
3149 | ||
3150 | acl_text = store_get(statbuf.st_size + 1); | |
3151 | acl_text_end = acl_text + statbuf.st_size + 1; | |
3152 | ||
3153 | if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size) | |
3154 | { | |
3155 | *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s", | |
3156 | ss, strerror(errno)); | |
3157 | return ERROR; | |
3158 | } | |
3159 | acl_text[statbuf.st_size] = 0; | |
f1e894f3 | 3160 | (void)close(fd); |
059ec3d9 PH |
3161 | |
3162 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
3163 | HDEBUG(D_acl) debug_printf("read ACL from file %s\n", ss); | |
3164 | } | |
3165 | } | |
3166 | ||
3167 | /* Parse an ACL that is still in text form. If it came from a file, remember it | |
3168 | in the ACL tree, having read it into the POOL_PERM store pool so that it | |
3169 | persists between multiple messages. */ | |
3170 | ||
3171 | if (acl == NULL) | |
3172 | { | |
3173 | int old_pool = store_pool; | |
3174 | if (fd >= 0) store_pool = POOL_PERM; | |
3175 | acl = acl_read(acl_getline, log_msgptr); | |
3176 | store_pool = old_pool; | |
3177 | if (acl == NULL && *log_msgptr != NULL) return ERROR; | |
3178 | if (fd >= 0) | |
3179 | { | |
3180 | tree_node *t = store_get_perm(sizeof(tree_node) + Ustrlen(ss)); | |
3181 | Ustrcpy(t->name, ss); | |
3182 | t->data.ptr = acl; | |
3183 | (void)tree_insertnode(&acl_anchor, t); | |
3184 | } | |
3185 | } | |
3186 | ||
3187 | /* Now we have an ACL to use. It's possible it may be NULL. */ | |
3188 | ||
3189 | while (acl != NULL) | |
3190 | { | |
3191 | int cond; | |
3192 | int basic_errno = 0; | |
3193 | BOOL endpass_seen = FALSE; | |
3194 | ||
3195 | *log_msgptr = *user_msgptr = NULL; | |
3196 | acl_temp_details = FALSE; | |
3197 | ||
3198 | if (where == ACL_WHERE_QUIT && | |
3199 | acl->verb != ACL_ACCEPT && | |
3200 | acl->verb != ACL_WARN) | |
3201 | { | |
3202 | *log_msgptr = string_sprintf("\"%s\" is not allowed in a QUIT ACL", | |
3203 | verbs[acl->verb]); | |
3204 | return ERROR; | |
3205 | } | |
3206 | ||
3207 | HDEBUG(D_acl) debug_printf("processing \"%s\"\n", verbs[acl->verb]); | |
3208 | ||
3209 | /* Clear out any search error message from a previous check before testing | |
3210 | this condition. */ | |
3211 | ||
3212 | search_error_message = NULL; | |
3213 | cond = acl_check_condition(acl->verb, acl->condition, where, addr, level, | |
3214 | &endpass_seen, user_msgptr, log_msgptr, &basic_errno); | |
3215 | ||
3216 | /* Handle special returns: DEFER causes a return except on a WARN verb; | |
3217 | ERROR always causes a return. */ | |
3218 | ||
3219 | switch (cond) | |
3220 | { | |
3221 | case DEFER: | |
3222 | HDEBUG(D_acl) debug_printf("%s: condition test deferred\n", verbs[acl->verb]); | |
3223 | if (basic_errno != ERRNO_CALLOUTDEFER) | |
3224 | { | |
3225 | if (search_error_message != NULL && *search_error_message != 0) | |
3226 | *log_msgptr = search_error_message; | |
3227 | if (smtp_return_error_details) acl_temp_details = TRUE; | |
3228 | } | |
3229 | else | |
3230 | { | |
3231 | acl_temp_details = TRUE; | |
3232 | } | |
3233 | if (acl->verb != ACL_WARN) return DEFER; | |
3234 | break; | |
3235 | ||
3236 | default: /* Paranoia */ | |
3237 | case ERROR: | |
3238 | HDEBUG(D_acl) debug_printf("%s: condition test error\n", verbs[acl->verb]); | |
3239 | return ERROR; | |
3240 | ||
3241 | case OK: | |
3242 | HDEBUG(D_acl) debug_printf("%s: condition test succeeded\n", | |
3243 | verbs[acl->verb]); | |
3244 | break; | |
3245 | ||
3246 | case FAIL: | |
3247 | HDEBUG(D_acl) debug_printf("%s: condition test failed\n", verbs[acl->verb]); | |
3248 | break; | |
3249 | ||
3250 | /* DISCARD and DROP can happen only from a nested ACL condition, and | |
3251 | DISCARD can happen only for an "accept" or "discard" verb. */ | |
3252 | ||
3253 | case DISCARD: | |
3254 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"discard\"\n", | |
3255 | verbs[acl->verb]); | |
3256 | break; | |
3257 | ||
3258 | case FAIL_DROP: | |
3259 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"drop\"\n", | |
3260 | verbs[acl->verb]); | |
3261 | break; | |
3262 | } | |
3263 | ||
3264 | /* At this point, cond for most verbs is either OK or FAIL or (as a result of | |
3265 | a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and | |
3266 | for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */ | |
3267 | ||
3268 | switch(acl->verb) | |
3269 | { | |
3270 | case ACL_ACCEPT: | |
3271 | if (cond == OK || cond == DISCARD) return cond; | |
3272 | if (endpass_seen) | |
3273 | { | |
3274 | HDEBUG(D_acl) debug_printf("accept: endpass encountered - denying access\n"); | |
3275 | return cond; | |
3276 | } | |
3277 | break; | |
3278 | ||
3279 | case ACL_DEFER: | |
3280 | if (cond == OK) | |
3281 | { | |
3282 | acl_temp_details = TRUE; | |
3283 | return DEFER; | |
3284 | } | |
3285 | break; | |
3286 | ||
3287 | case ACL_DENY: | |
3288 | if (cond == OK) return FAIL; | |
3289 | break; | |
3290 | ||
3291 | case ACL_DISCARD: | |
3292 | if (cond == OK || cond == DISCARD) return DISCARD; | |
3293 | if (endpass_seen) | |
3294 | { | |
3295 | HDEBUG(D_acl) debug_printf("discard: endpass encountered - denying access\n"); | |
3296 | return cond; | |
3297 | } | |
3298 | break; | |
3299 | ||
3300 | case ACL_DROP: | |
3301 | if (cond == OK) return FAIL_DROP; | |
3302 | break; | |
3303 | ||
3304 | case ACL_REQUIRE: | |
3305 | if (cond != OK) return cond; | |
3306 | break; | |
3307 | ||
3308 | case ACL_WARN: | |
3309 | if (cond == OK) | |
3310 | acl_warn(where, *user_msgptr, *log_msgptr); | |
3311 | else if (cond == DEFER) | |
9c7a242c PH |
3312 | log_write(0, LOG_MAIN, "%s Warning: ACL \"warn\" statement skipped: " |
3313 | "condition test deferred%s%s", host_and_ident(TRUE), | |
3314 | (*log_msgptr == NULL)? US"" : US": ", | |
3315 | (*log_msgptr == NULL)? US"" : *log_msgptr); | |
059ec3d9 PH |
3316 | *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */ |
3317 | break; | |
3318 | ||
3319 | default: | |
3320 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d", | |
3321 | acl->verb); | |
3322 | break; | |
3323 | } | |
3324 | ||
3325 | /* Pass to the next ACL item */ | |
3326 | ||
3327 | acl = acl->next; | |
3328 | } | |
3329 | ||
3330 | /* We have reached the end of the ACL. This is an implicit DENY. */ | |
3331 | ||
3332 | HDEBUG(D_acl) debug_printf("end of %s: implicit DENY\n", acl_name); | |
3333 | return FAIL; | |
3334 | } | |
3335 | ||
3336 | ||
3337 | /************************************************* | |
3338 | * Check access using an ACL * | |
3339 | *************************************************/ | |
3340 | ||
3341 | /* This is the external interface for ACL checks. It sets up an address and the | |
3342 | expansions for $domain and $local_part when called after RCPT, then calls | |
3343 | acl_check_internal() to do the actual work. | |
3344 | ||
3345 | Arguments: | |
3346 | where ACL_WHERE_xxxx indicating where called from | |
64ffc24f | 3347 | recipient RCPT address for RCPT check, else NULL |
059ec3d9 PH |
3348 | s the input string; NULL is the same as an empty ACL => DENY |
3349 | user_msgptr where to put a user error (for SMTP response) | |
3350 | log_msgptr where to put a logging message (not for SMTP response) | |
3351 | ||
3352 | Returns: OK access is granted by an ACCEPT verb | |
3353 | DISCARD access is granted by a DISCARD verb | |
3354 | FAIL access is denied | |
3355 | FAIL_DROP access is denied; drop the connection | |
3356 | DEFER can't tell at the moment | |
3357 | ERROR disaster | |
3358 | */ | |
3359 | ||
3360 | int | |
64ffc24f | 3361 | acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr, |
059ec3d9 PH |
3362 | uschar **log_msgptr) |
3363 | { | |
3364 | int rc; | |
3365 | address_item adb; | |
64ffc24f | 3366 | address_item *addr = NULL; |
059ec3d9 PH |
3367 | |
3368 | *user_msgptr = *log_msgptr = NULL; | |
3369 | sender_verified_failed = NULL; | |
fe0dab11 | 3370 | ratelimiters_cmd = NULL; |
059ec3d9 PH |
3371 | |
3372 | if (where == ACL_WHERE_RCPT) | |
3373 | { | |
3374 | adb = address_defaults; | |
3375 | addr = &adb; | |
64ffc24f | 3376 | addr->address = recipient; |
059ec3d9 PH |
3377 | if (deliver_split_address(addr) == DEFER) |
3378 | { | |
3379 | *log_msgptr = US"defer in percent_hack_domains check"; | |
3380 | return DEFER; | |
3381 | } | |
3382 | deliver_domain = addr->domain; | |
3383 | deliver_localpart = addr->local_part; | |
3384 | } | |
059ec3d9 PH |
3385 | |
3386 | rc = acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr); | |
3387 | ||
64ffc24f PH |
3388 | deliver_domain = deliver_localpart = deliver_address_data = |
3389 | sender_address_data = NULL; | |
059ec3d9 PH |
3390 | |
3391 | /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA | |
3392 | ACL, which is really in the middle of an SMTP command. */ | |
3393 | ||
3394 | if (rc == DISCARD) | |
3395 | { | |
3396 | if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA) | |
3397 | { | |
3398 | log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s " | |
3399 | "ACL", acl_wherenames[where]); | |
3400 | return ERROR; | |
3401 | } | |
3402 | return DISCARD; | |
3403 | } | |
3404 | ||
3405 | /* A DROP response is not permitted from MAILAUTH */ | |
3406 | ||
3407 | if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH) | |
3408 | { | |
3409 | log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s " | |
3410 | "ACL", acl_wherenames[where]); | |
3411 | return ERROR; | |
3412 | } | |
3413 | ||
3414 | /* Before giving an error response, take a look at the length of any user | |
3415 | message, and split it up into multiple lines if possible. */ | |
3416 | ||
3417 | if (rc != OK && *user_msgptr != NULL && Ustrlen(*user_msgptr) > 75) | |
3418 | { | |
3419 | uschar *s = *user_msgptr = string_copy(*user_msgptr); | |
3420 | uschar *ss = s; | |
3421 | ||
3422 | for (;;) | |
3423 | { | |
3424 | int i = 0; | |
3425 | while (i < 75 && *ss != 0 && *ss != '\n') ss++, i++; | |
3426 | if (*ss == 0) break; | |
3427 | if (*ss == '\n') | |
3428 | s = ++ss; | |
3429 | else | |
3430 | { | |
3431 | uschar *t = ss + 1; | |
3432 | uschar *tt = NULL; | |
3433 | while (--t > s + 35) | |
3434 | { | |
3435 | if (*t == ' ') | |
3436 | { | |
3437 | if (t[-1] == ':') { tt = t; break; } | |
3438 | if (tt == NULL) tt = t; | |
3439 | } | |
3440 | } | |
3441 | ||
3442 | if (tt == NULL) /* Can't split behind - try ahead */ | |
3443 | { | |
3444 | t = ss + 1; | |
3445 | while (*t != 0) | |
3446 | { | |
3447 | if (*t == ' ' || *t == '\n') | |
3448 | { tt = t; break; } | |
3449 | t++; | |
3450 | } | |
3451 | } | |
3452 | ||
3453 | if (tt == NULL) break; /* Can't find anywhere to split */ | |
3454 | *tt = '\n'; | |
3455 | s = ss = tt+1; | |
3456 | } | |
3457 | } | |
3458 | } | |
3459 | ||
3460 | return rc; | |
3461 | } | |
3462 | ||
3463 | /* End of acl.c */ |