Commit | Line | Data |
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7353285c | 1 | /* $Cambridge: exim/src/src/acl.c,v 1.79 2007/08/29 13:58:25 ph10 Exp $ */ |
059ec3d9 PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
184e8823 | 7 | /* Copyright (c) University of Cambridge 1995 - 2007 */ |
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 | ||
4e88a19f PH |
30 | /* For each verb, the conditions for which "message" or "log_message" are used |
31 | are held as a bitmap. This is to avoid expanding the strings unnecessarily. For | |
32 | "accept", the FAIL case is used only after "endpass", but that is selected in | |
33 | the code. */ | |
34 | ||
35 | static int msgcond[] = { | |
36 | (1<<OK) | (1<<FAIL) | (1<<FAIL_DROP), /* accept */ | |
37 | (1<<OK), /* defer */ | |
38 | (1<<OK), /* deny */ | |
39 | (1<<OK) | (1<<FAIL) | (1<<FAIL_DROP), /* discard */ | |
40 | (1<<OK), /* drop */ | |
41 | (1<<FAIL) | (1<<FAIL_DROP), /* require */ | |
42 | (1<<OK) /* warn */ | |
43 | }; | |
059ec3d9 PH |
44 | |
45 | /* ACL condition and modifier codes - keep in step with the table that | |
71fafd95 PH |
46 | follows, and the cond_expand_at_top and uschar cond_modifiers tables lower |
47 | down. */ | |
059ec3d9 | 48 | |
71fafd95 PH |
49 | enum { ACLC_ACL, |
50 | ACLC_ADD_HEADER, | |
51 | ACLC_AUTHENTICATED, | |
8523533c TK |
52 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
53 | ACLC_BMI_OPTIN, | |
54 | #endif | |
71fafd95 | 55 | ACLC_CONDITION, |
c3611384 | 56 | ACLC_CONTINUE, |
71fafd95 | 57 | ACLC_CONTROL, |
8523533c TK |
58 | #ifdef WITH_CONTENT_SCAN |
59 | ACLC_DECODE, | |
60 | #endif | |
61 | ACLC_DELAY, | |
62 | #ifdef WITH_OLD_DEMIME | |
63 | ACLC_DEMIME, | |
fb2274d4 TK |
64 | #endif |
65 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
66 | ACLC_DK_DOMAIN_SOURCE, | |
67 | ACLC_DK_POLICY, | |
68 | ACLC_DK_SENDER_DOMAINS, | |
69 | ACLC_DK_SENDER_LOCAL_PARTS, | |
70 | ACLC_DK_SENDERS, | |
71 | ACLC_DK_STATUS, | |
8e669ac1 | 72 | #endif |
71fafd95 PH |
73 | ACLC_DNSLISTS, |
74 | ACLC_DOMAINS, | |
75 | ACLC_ENCRYPTED, | |
76 | ACLC_ENDPASS, | |
77 | ACLC_HOSTS, | |
78 | ACLC_LOCAL_PARTS, | |
79 | ACLC_LOG_MESSAGE, | |
6ea85e9a | 80 | ACLC_LOG_REJECT_TARGET, |
71fafd95 | 81 | ACLC_LOGWRITE, |
8523533c TK |
82 | #ifdef WITH_CONTENT_SCAN |
83 | ACLC_MALWARE, | |
84 | #endif | |
85 | ACLC_MESSAGE, | |
86 | #ifdef WITH_CONTENT_SCAN | |
87 | ACLC_MIME_REGEX, | |
88 | #endif | |
870f6ba8 | 89 | ACLC_RATELIMIT, |
8523533c TK |
90 | ACLC_RECIPIENTS, |
91 | #ifdef WITH_CONTENT_SCAN | |
92 | ACLC_REGEX, | |
93 | #endif | |
71fafd95 PH |
94 | ACLC_SENDER_DOMAINS, |
95 | ACLC_SENDERS, | |
96 | ACLC_SET, | |
8523533c | 97 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 98 | ACLC_SPAM, |
8523533c TK |
99 | #endif |
100 | #ifdef EXPERIMENTAL_SPF | |
101 | ACLC_SPF, | |
102 | #endif | |
103 | ACLC_VERIFY }; | |
059ec3d9 | 104 | |
c3611384 PH |
105 | /* ACL conditions/modifiers: "delay", "control", "continue", "endpass", |
106 | "message", "log_message", "log_reject_target", "logwrite", and "set" are | |
107 | modifiers that look like conditions but always return TRUE. They are used for | |
108 | their side effects. */ | |
059ec3d9 | 109 | |
9a26b6b2 PH |
110 | static uschar *conditions[] = { |
111 | US"acl", | |
71fafd95 | 112 | US"add_header", |
9a26b6b2 | 113 | US"authenticated", |
8523533c TK |
114 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
115 | US"bmi_optin", | |
116 | #endif | |
117 | US"condition", | |
c3611384 | 118 | US"continue", |
8e669ac1 | 119 | US"control", |
8523533c TK |
120 | #ifdef WITH_CONTENT_SCAN |
121 | US"decode", | |
122 | #endif | |
123 | US"delay", | |
124 | #ifdef WITH_OLD_DEMIME | |
125 | US"demime", | |
fb2274d4 TK |
126 | #endif |
127 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
7f45268c PH |
128 | US"dk_domain_source", |
129 | US"dk_policy", | |
130 | US"dk_sender_domains", | |
131 | US"dk_sender_local_parts", | |
132 | US"dk_senders", | |
133 | US"dk_status", | |
8523533c | 134 | #endif |
6ea85e9a PH |
135 | US"dnslists", |
136 | US"domains", | |
137 | US"encrypted", | |
138 | US"endpass", | |
139 | US"hosts", | |
140 | US"local_parts", | |
141 | US"log_message", | |
142 | US"log_reject_target", | |
143 | US"logwrite", | |
8523533c TK |
144 | #ifdef WITH_CONTENT_SCAN |
145 | US"malware", | |
146 | #endif | |
147 | US"message", | |
148 | #ifdef WITH_CONTENT_SCAN | |
149 | US"mime_regex", | |
150 | #endif | |
870f6ba8 | 151 | US"ratelimit", |
8523533c TK |
152 | US"recipients", |
153 | #ifdef WITH_CONTENT_SCAN | |
154 | US"regex", | |
155 | #endif | |
156 | US"sender_domains", US"senders", US"set", | |
157 | #ifdef WITH_CONTENT_SCAN | |
158 | US"spam", | |
159 | #endif | |
160 | #ifdef EXPERIMENTAL_SPF | |
161 | US"spf", | |
162 | #endif | |
059ec3d9 | 163 | US"verify" }; |
8e669ac1 | 164 | |
c5fcb476 | 165 | |
9a26b6b2 PH |
166 | /* Return values from decode_control(); keep in step with the table of names |
167 | that follows! */ | |
168 | ||
169 | enum { | |
c46782ef PH |
170 | CONTROL_AUTH_UNADVERTISED, |
171 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
9a26b6b2 | 172 | CONTROL_BMI_RUN, |
c46782ef PH |
173 | #endif |
174 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
9a26b6b2 | 175 | CONTROL_DK_VERIFY, |
c46782ef PH |
176 | #endif |
177 | CONTROL_ERROR, | |
178 | CONTROL_CASEFUL_LOCAL_PART, | |
179 | CONTROL_CASELOWER_LOCAL_PART, | |
180 | CONTROL_ENFORCE_SYNC, | |
181 | CONTROL_NO_ENFORCE_SYNC, | |
182 | CONTROL_FREEZE, | |
183 | CONTROL_QUEUE_ONLY, | |
184 | CONTROL_SUBMISSION, | |
185 | CONTROL_SUPPRESS_LOCAL_FIXUPS, | |
186 | #ifdef WITH_CONTENT_SCAN | |
9a26b6b2 | 187 | CONTROL_NO_MBOX_UNSPOOL, |
c46782ef PH |
188 | #endif |
189 | CONTROL_FAKEDEFER, | |
190 | CONTROL_FAKEREJECT, | |
cf8b11a5 | 191 | CONTROL_NO_MULTILINE, |
047bdd8c | 192 | CONTROL_NO_PIPELINING, |
4c590bd1 PH |
193 | CONTROL_NO_DELAY_FLUSH, |
194 | CONTROL_NO_CALLOUT_FLUSH | |
c46782ef | 195 | }; |
9a26b6b2 | 196 | |
8800895a PH |
197 | /* ACL control names; keep in step with the table above! This list is used for |
198 | turning ids into names. The actual list of recognized names is in the variable | |
199 | control_def controls_list[] below. The fact that there are two lists is a mess | |
200 | and should be tidied up. */ | |
9a26b6b2 PH |
201 | |
202 | static uschar *controls[] = { | |
c46782ef | 203 | US"allow_auth_unadvertised", |
9a26b6b2 PH |
204 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
205 | US"bmi_run", | |
206 | #endif | |
207 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
208 | US"dk_verify", | |
209 | #endif | |
c46782ef PH |
210 | US"error", |
211 | US"caseful_local_part", | |
212 | US"caselower_local_part", | |
213 | US"enforce_sync", | |
214 | US"no_enforce_sync", | |
215 | US"freeze", | |
216 | US"queue_only", | |
217 | US"submission", | |
218 | US"suppress_local_fixups", | |
9a26b6b2 PH |
219 | #ifdef WITH_CONTENT_SCAN |
220 | US"no_mbox_unspool", | |
221 | #endif | |
cf8b11a5 PH |
222 | US"fakedefer", |
223 | US"fakereject", | |
aa6dc513 | 224 | US"no_multiline_responses", |
cf8b11a5 | 225 | US"no_pipelining", |
4c590bd1 PH |
226 | US"no_delay_flush", |
227 | US"no_callout_flush" | |
c46782ef | 228 | }; |
059ec3d9 | 229 | |
047bdd8c | 230 | /* Flags to indicate for which conditions/modifiers a string expansion is done |
059ec3d9 PH |
231 | at the outer level. In the other cases, expansion already occurs in the |
232 | checking functions. */ | |
233 | ||
234 | static uschar cond_expand_at_top[] = { | |
235 | TRUE, /* acl */ | |
3e536984 | 236 | TRUE, /* add_header */ |
059ec3d9 | 237 | FALSE, /* authenticated */ |
8523533c TK |
238 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
239 | TRUE, /* bmi_optin */ | |
8e669ac1 | 240 | #endif |
059ec3d9 | 241 | TRUE, /* condition */ |
c3611384 | 242 | TRUE, /* continue */ |
059ec3d9 | 243 | TRUE, /* control */ |
8523533c TK |
244 | #ifdef WITH_CONTENT_SCAN |
245 | TRUE, /* decode */ | |
246 | #endif | |
059ec3d9 | 247 | TRUE, /* delay */ |
8523533c TK |
248 | #ifdef WITH_OLD_DEMIME |
249 | TRUE, /* demime */ | |
fb2274d4 TK |
250 | #endif |
251 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
7f45268c PH |
252 | TRUE, /* dk_domain_source */ |
253 | TRUE, /* dk_policy */ | |
254 | TRUE, /* dk_sender_domains */ | |
e715ad22 | 255 | TRUE, /* dk_sender_local_parts */ |
7f45268c PH |
256 | TRUE, /* dk_senders */ |
257 | TRUE, /* dk_status */ | |
8523533c | 258 | #endif |
059ec3d9 PH |
259 | TRUE, /* dnslists */ |
260 | FALSE, /* domains */ | |
261 | FALSE, /* encrypted */ | |
262 | TRUE, /* endpass */ | |
263 | FALSE, /* hosts */ | |
264 | FALSE, /* local_parts */ | |
265 | TRUE, /* log_message */ | |
6ea85e9a | 266 | TRUE, /* log_reject_target */ |
059ec3d9 | 267 | TRUE, /* logwrite */ |
8523533c TK |
268 | #ifdef WITH_CONTENT_SCAN |
269 | TRUE, /* malware */ | |
270 | #endif | |
059ec3d9 | 271 | TRUE, /* message */ |
8523533c TK |
272 | #ifdef WITH_CONTENT_SCAN |
273 | TRUE, /* mime_regex */ | |
274 | #endif | |
870f6ba8 | 275 | TRUE, /* ratelimit */ |
059ec3d9 | 276 | FALSE, /* recipients */ |
8523533c TK |
277 | #ifdef WITH_CONTENT_SCAN |
278 | TRUE, /* regex */ | |
279 | #endif | |
059ec3d9 PH |
280 | FALSE, /* sender_domains */ |
281 | FALSE, /* senders */ | |
282 | TRUE, /* set */ | |
8523533c TK |
283 | #ifdef WITH_CONTENT_SCAN |
284 | TRUE, /* spam */ | |
285 | #endif | |
286 | #ifdef EXPERIMENTAL_SPF | |
287 | TRUE, /* spf */ | |
288 | #endif | |
059ec3d9 PH |
289 | TRUE /* verify */ |
290 | }; | |
291 | ||
292 | /* Flags to identify the modifiers */ | |
293 | ||
294 | static uschar cond_modifiers[] = { | |
295 | FALSE, /* acl */ | |
3e536984 | 296 | TRUE, /* add_header */ |
059ec3d9 | 297 | FALSE, /* authenticated */ |
8523533c TK |
298 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
299 | TRUE, /* bmi_optin */ | |
8e669ac1 | 300 | #endif |
059ec3d9 | 301 | FALSE, /* condition */ |
c3611384 | 302 | TRUE, /* continue */ |
059ec3d9 | 303 | TRUE, /* control */ |
8523533c TK |
304 | #ifdef WITH_CONTENT_SCAN |
305 | FALSE, /* decode */ | |
306 | #endif | |
059ec3d9 | 307 | TRUE, /* delay */ |
8523533c TK |
308 | #ifdef WITH_OLD_DEMIME |
309 | FALSE, /* demime */ | |
fb2274d4 TK |
310 | #endif |
311 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
7f45268c PH |
312 | FALSE, /* dk_domain_source */ |
313 | FALSE, /* dk_policy */ | |
314 | FALSE, /* dk_sender_domains */ | |
e715ad22 | 315 | FALSE, /* dk_sender_local_parts */ |
7f45268c PH |
316 | FALSE, /* dk_senders */ |
317 | FALSE, /* dk_status */ | |
8523533c | 318 | #endif |
059ec3d9 PH |
319 | FALSE, /* dnslists */ |
320 | FALSE, /* domains */ | |
321 | FALSE, /* encrypted */ | |
322 | TRUE, /* endpass */ | |
323 | FALSE, /* hosts */ | |
324 | FALSE, /* local_parts */ | |
325 | TRUE, /* log_message */ | |
6ea85e9a | 326 | TRUE, /* log_reject_target */ |
8523533c TK |
327 | TRUE, /* logwrite */ |
328 | #ifdef WITH_CONTENT_SCAN | |
329 | FALSE, /* malware */ | |
330 | #endif | |
059ec3d9 | 331 | TRUE, /* message */ |
8523533c TK |
332 | #ifdef WITH_CONTENT_SCAN |
333 | FALSE, /* mime_regex */ | |
334 | #endif | |
870f6ba8 | 335 | FALSE, /* ratelimit */ |
059ec3d9 | 336 | FALSE, /* recipients */ |
8523533c TK |
337 | #ifdef WITH_CONTENT_SCAN |
338 | FALSE, /* regex */ | |
339 | #endif | |
059ec3d9 PH |
340 | FALSE, /* sender_domains */ |
341 | FALSE, /* senders */ | |
342 | TRUE, /* set */ | |
8523533c TK |
343 | #ifdef WITH_CONTENT_SCAN |
344 | FALSE, /* spam */ | |
345 | #endif | |
346 | #ifdef EXPERIMENTAL_SPF | |
347 | FALSE, /* spf */ | |
348 | #endif | |
059ec3d9 PH |
349 | FALSE /* verify */ |
350 | }; | |
351 | ||
c3611384 | 352 | /* Bit map vector of which conditions and modifiers are not allowed at certain |
8f128379 PH |
353 | times. For each condition and modifier, there's a bitmap of dis-allowed times. |
354 | For some, it is easier to specify the negation of a small number of allowed | |
355 | times. */ | |
059ec3d9 PH |
356 | |
357 | static unsigned int cond_forbids[] = { | |
358 | 0, /* acl */ | |
8e669ac1 | 359 | |
71fafd95 | 360 | (unsigned int) |
45b91596 | 361 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* add_header */ |
71fafd95 | 362 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
45b91596 PH |
363 | (1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)| |
364 | (1<<ACL_WHERE_NOTSMTP_START)), | |
71fafd95 | 365 | |
45b91596 PH |
366 | (1<<ACL_WHERE_NOTSMTP)| /* authenticated */ |
367 | (1<<ACL_WHERE_NOTSMTP_START)| | |
368 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO), | |
8e669ac1 | 369 | |
71fafd95 | 370 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
3864bb8e | 371 | (1<<ACL_WHERE_AUTH)| /* bmi_optin */ |
8523533c TK |
372 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
373 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_MIME)| | |
8e669ac1 | 374 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
8523533c TK |
375 | (1<<ACL_WHERE_MAILAUTH)| |
376 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 PH |
377 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_PREDATA)| |
378 | (1<<ACL_WHERE_NOTSMTP_START), | |
71fafd95 | 379 | #endif |
8e669ac1 | 380 | |
059ec3d9 | 381 | 0, /* condition */ |
8e669ac1 | 382 | |
c3611384 PH |
383 | 0, /* continue */ |
384 | ||
059ec3d9 | 385 | /* Certain types of control are always allowed, so we let it through |
2f079f46 | 386 | always and check in the control processing itself. */ |
8e669ac1 | 387 | |
059ec3d9 | 388 | 0, /* control */ |
8e669ac1 | 389 | |
71fafd95 | 390 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
391 | (unsigned int) |
392 | ~(1<<ACL_WHERE_MIME), /* decode */ | |
71fafd95 | 393 | #endif |
8523533c | 394 | |
8f128379 | 395 | (1<<ACL_WHERE_NOTQUIT), /* delay */ |
8e669ac1 | 396 | |
71fafd95 | 397 | #ifdef WITH_OLD_DEMIME |
2f079f46 PH |
398 | (unsigned int) |
399 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* demime */ | |
71fafd95 | 400 | #endif |
8e669ac1 | 401 | |
71fafd95 | 402 | #ifdef EXPERIMENTAL_DOMAINKEYS |
2f079f46 | 403 | (1<<ACL_WHERE_AUTH)| /* dk_domain_source */ |
fb2274d4 TK |
404 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
405 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
406 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
407 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
408 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 409 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 410 | |
2f079f46 | 411 | (1<<ACL_WHERE_AUTH)| /* dk_policy */ |
fb2274d4 TK |
412 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
413 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
414 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
415 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
416 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 417 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 418 | |
2f079f46 | 419 | (1<<ACL_WHERE_AUTH)| /* dk_sender_domains */ |
fb2274d4 TK |
420 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
421 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
422 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
423 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
424 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 425 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 426 | |
2f079f46 | 427 | (1<<ACL_WHERE_AUTH)| /* dk_sender_local_parts */ |
fb2274d4 TK |
428 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
429 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
430 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
431 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
432 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 433 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 434 | |
2f079f46 | 435 | (1<<ACL_WHERE_AUTH)| /* dk_senders */ |
fb2274d4 TK |
436 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
437 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
438 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
439 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
440 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 441 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 442 | |
2f079f46 | 443 | (1<<ACL_WHERE_AUTH)| /* dk_status */ |
fb2274d4 TK |
444 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
445 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
446 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
447 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
448 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 449 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
71fafd95 | 450 | #endif |
fb2274d4 | 451 | |
45b91596 PH |
452 | (1<<ACL_WHERE_NOTSMTP)| /* dnslists */ |
453 | (1<<ACL_WHERE_NOTSMTP_START), | |
059ec3d9 | 454 | |
2f079f46 PH |
455 | (unsigned int) |
456 | ~(1<<ACL_WHERE_RCPT), /* domains */ | |
059ec3d9 | 457 | |
45b91596 PH |
458 | (1<<ACL_WHERE_NOTSMTP)| /* encrypted */ |
459 | (1<<ACL_WHERE_CONNECT)| | |
460 | (1<<ACL_WHERE_NOTSMTP_START)| | |
059ec3d9 | 461 | (1<<ACL_WHERE_HELO), |
8e669ac1 | 462 | |
059ec3d9 | 463 | 0, /* endpass */ |
8e669ac1 | 464 | |
45b91596 PH |
465 | (1<<ACL_WHERE_NOTSMTP)| /* hosts */ |
466 | (1<<ACL_WHERE_NOTSMTP_START), | |
059ec3d9 | 467 | |
2f079f46 PH |
468 | (unsigned int) |
469 | ~(1<<ACL_WHERE_RCPT), /* local_parts */ | |
059ec3d9 PH |
470 | |
471 | 0, /* log_message */ | |
8e669ac1 | 472 | |
6ea85e9a PH |
473 | 0, /* log_reject_target */ |
474 | ||
059ec3d9 | 475 | 0, /* logwrite */ |
8e669ac1 | 476 | |
71fafd95 | 477 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
478 | (unsigned int) |
479 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* malware */ | |
71fafd95 | 480 | #endif |
8523533c | 481 | |
059ec3d9 PH |
482 | 0, /* message */ |
483 | ||
71fafd95 | 484 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
485 | (unsigned int) |
486 | ~(1<<ACL_WHERE_MIME), /* mime_regex */ | |
71fafd95 | 487 | #endif |
8523533c | 488 | |
870f6ba8 TF |
489 | 0, /* ratelimit */ |
490 | ||
2f079f46 PH |
491 | (unsigned int) |
492 | ~(1<<ACL_WHERE_RCPT), /* recipients */ | |
059ec3d9 | 493 | |
71fafd95 | 494 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
495 | (unsigned int) |
496 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* regex */ | |
497 | (1<<ACL_WHERE_MIME)), | |
71fafd95 | 498 | #endif |
8523533c | 499 | |
059ec3d9 PH |
500 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* sender_domains */ |
501 | (1<<ACL_WHERE_HELO)| | |
502 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
503 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
504 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
505 | ||
506 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* senders */ | |
507 | (1<<ACL_WHERE_HELO)| | |
508 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
509 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
510 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
511 | ||
512 | 0, /* set */ | |
513 | ||
71fafd95 | 514 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
515 | (unsigned int) |
516 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* spam */ | |
71fafd95 | 517 | #endif |
8523533c | 518 | |
71fafd95 | 519 | #ifdef EXPERIMENTAL_SPF |
8523533c TK |
520 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf */ |
521 | (1<<ACL_WHERE_HELO)| | |
522 | (1<<ACL_WHERE_MAILAUTH)| | |
523 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
45b91596 PH |
524 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY)| |
525 | (1<<ACL_WHERE_NOTSMTP)| | |
526 | (1<<ACL_WHERE_NOTSMTP_START), | |
71fafd95 | 527 | #endif |
8523533c | 528 | |
059ec3d9 PH |
529 | /* Certain types of verify are always allowed, so we let it through |
530 | always and check in the verify function itself */ | |
531 | ||
532 | 0 /* verify */ | |
059ec3d9 PH |
533 | }; |
534 | ||
535 | ||
c5fcb476 PH |
536 | /* Bit map vector of which controls are not allowed at certain times. For |
537 | each control, there's a bitmap of dis-allowed times. For some, it is easier to | |
538 | specify the negation of a small number of allowed times. */ | |
539 | ||
540 | static unsigned int control_forbids[] = { | |
c46782ef PH |
541 | (unsigned int) |
542 | ~((1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)), /* allow_auth_unadvertised */ | |
543 | ||
544 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
8523533c | 545 | 0, /* bmi_run */ |
c46782ef PH |
546 | #endif |
547 | ||
548 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
45b91596 PH |
549 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dk_verify */ |
550 | (1<<ACL_WHERE_NOTSMTP_START), | |
c46782ef | 551 | #endif |
3e11c26b | 552 | |
c5fcb476 | 553 | 0, /* error */ |
8e669ac1 PH |
554 | |
555 | (unsigned int) | |
c5fcb476 | 556 | ~(1<<ACL_WHERE_RCPT), /* caseful_local_part */ |
8e669ac1 PH |
557 | |
558 | (unsigned int) | |
c5fcb476 | 559 | ~(1<<ACL_WHERE_RCPT), /* caselower_local_part */ |
8e669ac1 | 560 | |
45b91596 PH |
561 | (1<<ACL_WHERE_NOTSMTP)| /* enforce_sync */ |
562 | (1<<ACL_WHERE_NOTSMTP_START), | |
8e669ac1 | 563 | |
45b91596 PH |
564 | (1<<ACL_WHERE_NOTSMTP)| /* no_enforce_sync */ |
565 | (1<<ACL_WHERE_NOTSMTP_START), | |
8e669ac1 PH |
566 | |
567 | (unsigned int) | |
c5fcb476 PH |
568 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* freeze */ |
569 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
e715ad22 | 570 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
571 | |
572 | (unsigned int) | |
c5fcb476 PH |
573 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* queue_only */ |
574 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
e715ad22 | 575 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
576 | |
577 | (unsigned int) | |
c5fcb476 | 578 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* submission */ |
8e669ac1 | 579 | (1<<ACL_WHERE_PREDATA)), |
8523533c | 580 | |
8800895a PH |
581 | (unsigned int) |
582 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* suppress_local_fixups */ | |
45b91596 PH |
583 | (1<<ACL_WHERE_PREDATA)| |
584 | (1<<ACL_WHERE_NOTSMTP_START)), | |
8800895a | 585 | |
c46782ef | 586 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 587 | (unsigned int) |
14d57970 | 588 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* no_mbox_unspool */ |
e715ad22 TK |
589 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
590 | (1<<ACL_WHERE_MIME)), | |
c46782ef | 591 | #endif |
a6c4ab60 | 592 | |
29aba418 TF |
593 | (unsigned int) |
594 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakedefer */ | |
595 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
596 | (1<<ACL_WHERE_MIME)), | |
597 | ||
8e669ac1 | 598 | (unsigned int) |
a6c4ab60 | 599 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakereject */ |
e715ad22 TK |
600 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
601 | (1<<ACL_WHERE_MIME)), | |
8523533c | 602 | |
45b91596 | 603 | (1<<ACL_WHERE_NOTSMTP)| /* no_multiline */ |
cf8b11a5 PH |
604 | (1<<ACL_WHERE_NOTSMTP_START), |
605 | ||
606 | (1<<ACL_WHERE_NOTSMTP)| /* no_pipelining */ | |
047bdd8c PH |
607 | (1<<ACL_WHERE_NOTSMTP_START), |
608 | ||
609 | (1<<ACL_WHERE_NOTSMTP)| /* no_delay_flush */ | |
4c590bd1 PH |
610 | (1<<ACL_WHERE_NOTSMTP_START), |
611 | ||
612 | (1<<ACL_WHERE_NOTSMTP)| /* no_callout_flush */ | |
45b91596 | 613 | (1<<ACL_WHERE_NOTSMTP_START) |
c5fcb476 PH |
614 | }; |
615 | ||
616 | /* Structure listing various control arguments, with their characteristics. */ | |
059ec3d9 PH |
617 | |
618 | typedef struct control_def { | |
619 | uschar *name; | |
620 | int value; /* CONTROL_xxx value */ | |
059ec3d9 PH |
621 | BOOL has_option; /* Has /option(s) following */ |
622 | } control_def; | |
623 | ||
624 | static control_def controls_list[] = { | |
c46782ef | 625 | { US"allow_auth_unadvertised", CONTROL_AUTH_UNADVERTISED, FALSE }, |
8523533c | 626 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
c46782ef | 627 | { US"bmi_run", CONTROL_BMI_RUN, FALSE }, |
fb2274d4 TK |
628 | #endif |
629 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
c46782ef | 630 | { US"dk_verify", CONTROL_DK_VERIFY, FALSE }, |
8523533c | 631 | #endif |
c46782ef PH |
632 | { US"caseful_local_part", CONTROL_CASEFUL_LOCAL_PART, FALSE }, |
633 | { US"caselower_local_part", CONTROL_CASELOWER_LOCAL_PART, FALSE }, | |
634 | { US"enforce_sync", CONTROL_ENFORCE_SYNC, FALSE }, | |
635 | { US"freeze", CONTROL_FREEZE, TRUE }, | |
4c590bd1 | 636 | { US"no_callout_flush", CONTROL_NO_CALLOUT_FLUSH, FALSE }, |
047bdd8c | 637 | { US"no_delay_flush", CONTROL_NO_DELAY_FLUSH, FALSE }, |
c46782ef PH |
638 | { US"no_enforce_sync", CONTROL_NO_ENFORCE_SYNC, FALSE }, |
639 | { US"no_multiline_responses", CONTROL_NO_MULTILINE, FALSE }, | |
cf8b11a5 | 640 | { US"no_pipelining", CONTROL_NO_PIPELINING, FALSE }, |
c46782ef | 641 | { US"queue_only", CONTROL_QUEUE_ONLY, FALSE }, |
8523533c | 642 | #ifdef WITH_CONTENT_SCAN |
c46782ef | 643 | { US"no_mbox_unspool", CONTROL_NO_MBOX_UNSPOOL, FALSE }, |
8523533c | 644 | #endif |
c46782ef PH |
645 | { US"fakedefer", CONTROL_FAKEDEFER, TRUE }, |
646 | { US"fakereject", CONTROL_FAKEREJECT, TRUE }, | |
647 | { US"submission", CONTROL_SUBMISSION, TRUE }, | |
648 | { US"suppress_local_fixups", CONTROL_SUPPRESS_LOCAL_FIXUPS, FALSE } | |
059ec3d9 PH |
649 | }; |
650 | ||
e5a9dba6 PH |
651 | /* Support data structures for Client SMTP Authorization. acl_verify_csa() |
652 | caches its result in a tree to avoid repeated DNS queries. The result is an | |
653 | integer code which is used as an index into the following tables of | |
654 | explanatory strings and verification return codes. */ | |
655 | ||
656 | static tree_node *csa_cache = NULL; | |
657 | ||
658 | enum { CSA_UNKNOWN, CSA_OK, CSA_DEFER_SRV, CSA_DEFER_ADDR, | |
659 | CSA_FAIL_EXPLICIT, CSA_FAIL_DOMAIN, CSA_FAIL_NOADDR, CSA_FAIL_MISMATCH }; | |
660 | ||
661 | /* The acl_verify_csa() return code is translated into an acl_verify() return | |
662 | code using the following table. It is OK unless the client is definitely not | |
663 | authorized. This is because CSA is supposed to be optional for sending sites, | |
664 | so recipients should not be too strict about checking it - especially because | |
665 | DNS problems are quite likely to occur. It's possible to use $csa_status in | |
666 | further ACL conditions to distinguish ok, unknown, and defer if required, but | |
667 | the aim is to make the usual configuration simple. */ | |
668 | ||
669 | static int csa_return_code[] = { | |
670 | OK, OK, OK, OK, | |
671 | FAIL, FAIL, FAIL, FAIL | |
672 | }; | |
673 | ||
674 | static uschar *csa_status_string[] = { | |
675 | US"unknown", US"ok", US"defer", US"defer", | |
676 | US"fail", US"fail", US"fail", US"fail" | |
677 | }; | |
678 | ||
679 | static uschar *csa_reason_string[] = { | |
680 | US"unknown", | |
681 | US"ok", | |
682 | US"deferred (SRV lookup failed)", | |
683 | US"deferred (target address lookup failed)", | |
684 | US"failed (explicit authorization required)", | |
685 | US"failed (host name not authorized)", | |
686 | US"failed (no authorized addresses)", | |
687 | US"failed (client address mismatch)" | |
688 | }; | |
689 | ||
059ec3d9 PH |
690 | /* Enable recursion between acl_check_internal() and acl_check_condition() */ |
691 | ||
692 | static int acl_check_internal(int, address_item *, uschar *, int, uschar **, | |
693 | uschar **); | |
694 | ||
695 | ||
696 | /************************************************* | |
697 | * Pick out name from list * | |
698 | *************************************************/ | |
699 | ||
700 | /* Use a binary chop method | |
701 | ||
702 | Arguments: | |
703 | name name to find | |
704 | list list of names | |
705 | end size of list | |
706 | ||
707 | Returns: offset in list, or -1 if not found | |
708 | */ | |
709 | ||
710 | static int | |
711 | acl_checkname(uschar *name, uschar **list, int end) | |
712 | { | |
713 | int start = 0; | |
714 | ||
715 | while (start < end) | |
716 | { | |
717 | int mid = (start + end)/2; | |
718 | int c = Ustrcmp(name, list[mid]); | |
719 | if (c == 0) return mid; | |
720 | if (c < 0) end = mid; else start = mid + 1; | |
721 | } | |
722 | ||
723 | return -1; | |
724 | } | |
725 | ||
726 | ||
727 | /************************************************* | |
728 | * Read and parse one ACL * | |
729 | *************************************************/ | |
730 | ||
731 | /* This function is called both from readconf in order to parse the ACLs in the | |
732 | configuration file, and also when an ACL is encountered dynamically (e.g. as | |
733 | the result of an expansion). It is given a function to call in order to | |
734 | retrieve the lines of the ACL. This function handles skipping comments and | |
735 | blank lines (where relevant). | |
736 | ||
737 | Arguments: | |
738 | func function to get next line of ACL | |
739 | error where to put an error message | |
740 | ||
741 | Returns: pointer to ACL, or NULL | |
742 | NULL can be legal (empty ACL); in this case error will be NULL | |
743 | */ | |
744 | ||
745 | acl_block * | |
746 | acl_read(uschar *(*func)(void), uschar **error) | |
747 | { | |
748 | acl_block *yield = NULL; | |
749 | acl_block **lastp = &yield; | |
750 | acl_block *this = NULL; | |
751 | acl_condition_block *cond; | |
752 | acl_condition_block **condp = NULL; | |
753 | uschar *s; | |
754 | ||
755 | *error = NULL; | |
756 | ||
757 | while ((s = (*func)()) != NULL) | |
758 | { | |
759 | int v, c; | |
760 | BOOL negated = FALSE; | |
761 | uschar *saveline = s; | |
762 | uschar name[64]; | |
763 | ||
764 | /* Conditions (but not verbs) are allowed to be negated by an initial | |
765 | exclamation mark. */ | |
766 | ||
767 | while (isspace(*s)) s++; | |
768 | if (*s == '!') | |
769 | { | |
770 | negated = TRUE; | |
771 | s++; | |
772 | } | |
773 | ||
cf00dad6 PH |
774 | /* Read the name of a verb or a condition, or the start of a new ACL, which |
775 | can be started by a name, or by a macro definition. */ | |
059ec3d9 PH |
776 | |
777 | s = readconf_readname(name, sizeof(name), s); | |
b8dc3e4a | 778 | if (*s == ':' || (isupper(name[0]) && *s == '=')) return yield; |
059ec3d9 PH |
779 | |
780 | /* If a verb is unrecognized, it may be another condition or modifier that | |
781 | continues the previous verb. */ | |
782 | ||
783 | v = acl_checkname(name, verbs, sizeof(verbs)/sizeof(char *)); | |
784 | if (v < 0) | |
785 | { | |
786 | if (this == NULL) | |
787 | { | |
4e167a8c PH |
788 | *error = string_sprintf("unknown ACL verb \"%s\" in \"%s\"", name, |
789 | saveline); | |
059ec3d9 PH |
790 | return NULL; |
791 | } | |
792 | } | |
793 | ||
794 | /* New verb */ | |
795 | ||
796 | else | |
797 | { | |
798 | if (negated) | |
799 | { | |
800 | *error = string_sprintf("malformed ACL line \"%s\"", saveline); | |
801 | return NULL; | |
802 | } | |
803 | this = store_get(sizeof(acl_block)); | |
804 | *lastp = this; | |
805 | lastp = &(this->next); | |
806 | this->next = NULL; | |
807 | this->verb = v; | |
808 | this->condition = NULL; | |
809 | condp = &(this->condition); | |
810 | if (*s == 0) continue; /* No condition on this line */ | |
811 | if (*s == '!') | |
812 | { | |
813 | negated = TRUE; | |
814 | s++; | |
815 | } | |
816 | s = readconf_readname(name, sizeof(name), s); /* Condition name */ | |
817 | } | |
818 | ||
819 | /* Handle a condition or modifier. */ | |
820 | ||
821 | c = acl_checkname(name, conditions, sizeof(conditions)/sizeof(char *)); | |
822 | if (c < 0) | |
823 | { | |
824 | *error = string_sprintf("unknown ACL condition/modifier in \"%s\"", | |
825 | saveline); | |
826 | return NULL; | |
827 | } | |
828 | ||
829 | /* The modifiers may not be negated */ | |
830 | ||
831 | if (negated && cond_modifiers[c]) | |
832 | { | |
833 | *error = string_sprintf("ACL error: negation is not allowed with " | |
834 | "\"%s\"", conditions[c]); | |
835 | return NULL; | |
836 | } | |
837 | ||
838 | /* ENDPASS may occur only with ACCEPT or DISCARD. */ | |
839 | ||
840 | if (c == ACLC_ENDPASS && | |
841 | this->verb != ACL_ACCEPT && | |
842 | this->verb != ACL_DISCARD) | |
843 | { | |
844 | *error = string_sprintf("ACL error: \"%s\" is not allowed with \"%s\"", | |
845 | conditions[c], verbs[this->verb]); | |
846 | return NULL; | |
847 | } | |
848 | ||
849 | cond = store_get(sizeof(acl_condition_block)); | |
850 | cond->next = NULL; | |
851 | cond->type = c; | |
852 | cond->u.negated = negated; | |
853 | ||
854 | *condp = cond; | |
855 | condp = &(cond->next); | |
856 | ||
857 | /* The "set" modifier is different in that its argument is "name=value" | |
858 | rather than just a value, and we can check the validity of the name, which | |
38a0a95f PH |
859 | gives us a variable name to insert into the data block. The original ACL |
860 | variable names were acl_c0 ... acl_c9 and acl_m0 ... acl_m9. This was | |
861 | extended to 20 of each type, but after that people successfully argued for | |
641cb756 PH |
862 | arbitrary names. In the new scheme, the names must start with acl_c or acl_m. |
863 | After that, we allow alphanumerics and underscores, but the first character | |
864 | after c or m must be a digit or an underscore. This retains backwards | |
865 | compatibility. */ | |
059ec3d9 PH |
866 | |
867 | if (c == ACLC_SET) | |
868 | { | |
47ca6d6c PH |
869 | uschar *endptr; |
870 | ||
38a0a95f PH |
871 | if (Ustrncmp(s, "acl_c", 5) != 0 && |
872 | Ustrncmp(s, "acl_m", 5) != 0) | |
47ca6d6c | 873 | { |
38a0a95f PH |
874 | *error = string_sprintf("invalid variable name after \"set\" in ACL " |
875 | "modifier \"set %s\" (must start \"acl_c\" or \"acl_m\")", s); | |
876 | return NULL; | |
47ca6d6c | 877 | } |
38a0a95f PH |
878 | |
879 | endptr = s + 5; | |
641cb756 PH |
880 | if (!isdigit(*endptr) && *endptr != '_') |
881 | { | |
882 | *error = string_sprintf("invalid variable name after \"set\" in ACL " | |
883 | "modifier \"set %s\" (digit or underscore must follow acl_c or acl_m)", | |
884 | s); | |
885 | return NULL; | |
886 | } | |
887 | ||
38a0a95f | 888 | while (*endptr != 0 && *endptr != '=' && !isspace(*endptr)) |
47ca6d6c | 889 | { |
38a0a95f PH |
890 | if (!isalnum(*endptr) && *endptr != '_') |
891 | { | |
892 | *error = string_sprintf("invalid character \"%c\" in variable name " | |
893 | "in ACL modifier \"set %s\"", *endptr, s); | |
894 | return NULL; | |
895 | } | |
896 | endptr++; | |
47ca6d6c | 897 | } |
47ca6d6c | 898 | |
38a0a95f | 899 | cond->u.varname = string_copyn(s + 4, endptr - s - 4); |
47ca6d6c | 900 | s = endptr; |
059ec3d9 PH |
901 | while (isspace(*s)) s++; |
902 | } | |
903 | ||
904 | /* For "set", we are now positioned for the data. For the others, only | |
905 | "endpass" has no data */ | |
906 | ||
907 | if (c != ACLC_ENDPASS) | |
908 | { | |
909 | if (*s++ != '=') | |
910 | { | |
911 | *error = string_sprintf("\"=\" missing after ACL \"%s\" %s", name, | |
912 | cond_modifiers[c]? US"modifier" : US"condition"); | |
913 | return NULL; | |
914 | } | |
915 | while (isspace(*s)) s++; | |
916 | cond->arg = string_copy(s); | |
917 | } | |
918 | } | |
919 | ||
920 | return yield; | |
921 | } | |
922 | ||
923 | ||
924 | ||
71fafd95 PH |
925 | /************************************************* |
926 | * Set up added header line(s) * | |
927 | *************************************************/ | |
928 | ||
929 | /* This function is called by the add_header modifier, and also from acl_warn() | |
930 | to implement the now-deprecated way of adding header lines using "message" on a | |
931 | "warn" verb. The argument is treated as a sequence of header lines which are | |
932 | added to a chain, provided there isn't an identical one already there. | |
933 | ||
934 | Argument: string of header lines | |
935 | Returns: nothing | |
936 | */ | |
937 | ||
938 | static void | |
939 | setup_header(uschar *hstring) | |
940 | { | |
941 | uschar *p, *q; | |
942 | int hlen = Ustrlen(hstring); | |
943 | ||
944 | /* An empty string does nothing; otherwise add a final newline if necessary. */ | |
945 | ||
946 | if (hlen <= 0) return; | |
947 | if (hstring[hlen-1] != '\n') hstring = string_sprintf("%s\n", hstring); | |
948 | ||
949 | /* Loop for multiple header lines, taking care about continuations */ | |
950 | ||
951 | for (p = q = hstring; *p != 0; ) | |
952 | { | |
953 | uschar *s; | |
954 | int newtype = htype_add_bot; | |
955 | header_line **hptr = &acl_added_headers; | |
956 | ||
957 | /* Find next header line within the string */ | |
958 | ||
959 | for (;;) | |
960 | { | |
961 | q = Ustrchr(q, '\n'); | |
962 | if (*(++q) != ' ' && *q != '\t') break; | |
963 | } | |
964 | ||
965 | /* If the line starts with a colon, interpret the instruction for where to | |
966 | add it. This temporarily sets up a new type. */ | |
967 | ||
968 | if (*p == ':') | |
969 | { | |
970 | if (strncmpic(p, US":after_received:", 16) == 0) | |
971 | { | |
972 | newtype = htype_add_rec; | |
973 | p += 16; | |
974 | } | |
975 | else if (strncmpic(p, US":at_start_rfc:", 14) == 0) | |
976 | { | |
977 | newtype = htype_add_rfc; | |
978 | p += 14; | |
979 | } | |
980 | else if (strncmpic(p, US":at_start:", 10) == 0) | |
981 | { | |
982 | newtype = htype_add_top; | |
983 | p += 10; | |
984 | } | |
985 | else if (strncmpic(p, US":at_end:", 8) == 0) | |
986 | { | |
987 | newtype = htype_add_bot; | |
988 | p += 8; | |
989 | } | |
990 | while (*p == ' ' || *p == '\t') p++; | |
991 | } | |
992 | ||
993 | /* See if this line starts with a header name, and if not, add X-ACL-Warn: | |
994 | to the front of it. */ | |
995 | ||
996 | for (s = p; s < q - 1; s++) | |
997 | { | |
998 | if (*s == ':' || !isgraph(*s)) break; | |
999 | } | |
1000 | ||
1001 | s = string_sprintf("%s%.*s", (*s == ':')? "" : "X-ACL-Warn: ", q - p, p); | |
1002 | hlen = Ustrlen(s); | |
1003 | ||
1004 | /* See if this line has already been added */ | |
1005 | ||
1006 | while (*hptr != NULL) | |
1007 | { | |
1008 | if (Ustrncmp((*hptr)->text, s, hlen) == 0) break; | |
1009 | hptr = &((*hptr)->next); | |
1010 | } | |
1011 | ||
1012 | /* Add if not previously present */ | |
1013 | ||
1014 | if (*hptr == NULL) | |
1015 | { | |
1016 | header_line *h = store_get(sizeof(header_line)); | |
1017 | h->text = s; | |
1018 | h->next = NULL; | |
1019 | h->type = newtype; | |
1020 | h->slen = hlen; | |
1021 | *hptr = h; | |
1022 | hptr = &(h->next); | |
1023 | } | |
1024 | ||
1025 | /* Advance for next header line within the string */ | |
1026 | ||
1027 | p = q; | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | ||
1032 | ||
1033 | ||
059ec3d9 PH |
1034 | /************************************************* |
1035 | * Handle warnings * | |
1036 | *************************************************/ | |
1037 | ||
1038 | /* This function is called when a WARN verb's conditions are true. It adds to | |
1039 | the message's headers, and/or writes information to the log. In each case, this | |
1040 | only happens once (per message for headers, per connection for log). | |
1041 | ||
71fafd95 PH |
1042 | ** NOTE: The header adding action using the "message" setting is historic, and |
1043 | its use is now deprecated. The new add_header modifier should be used instead. | |
1044 | ||
059ec3d9 PH |
1045 | Arguments: |
1046 | where ACL_WHERE_xxxx indicating which ACL this is | |
1047 | user_message message for adding to headers | |
1048 | log_message message for logging, if different | |
1049 | ||
1050 | Returns: nothing | |
1051 | */ | |
1052 | ||
1053 | static void | |
1054 | acl_warn(int where, uschar *user_message, uschar *log_message) | |
1055 | { | |
059ec3d9 PH |
1056 | if (log_message != NULL && log_message != user_message) |
1057 | { | |
1058 | uschar *text; | |
1059 | string_item *logged; | |
1060 | ||
1061 | text = string_sprintf("%s Warning: %s", host_and_ident(TRUE), | |
1062 | string_printing(log_message)); | |
1063 | ||
1064 | /* If a sender verification has failed, and the log message is "sender verify | |
1065 | failed", add the failure message. */ | |
1066 | ||
1067 | if (sender_verified_failed != NULL && | |
1068 | sender_verified_failed->message != NULL && | |
1069 | strcmpic(log_message, US"sender verify failed") == 0) | |
1070 | text = string_sprintf("%s: %s", text, sender_verified_failed->message); | |
1071 | ||
9c7a242c PH |
1072 | /* Search previously logged warnings. They are kept in malloc |
1073 | store so they can be freed at the start of a new message. */ | |
059ec3d9 PH |
1074 | |
1075 | for (logged = acl_warn_logged; logged != NULL; logged = logged->next) | |
1076 | if (Ustrcmp(logged->text, text) == 0) break; | |
1077 | ||
1078 | if (logged == NULL) | |
1079 | { | |
1080 | int length = Ustrlen(text) + 1; | |
1081 | log_write(0, LOG_MAIN, "%s", text); | |
1082 | logged = store_malloc(sizeof(string_item) + length); | |
1083 | logged->text = (uschar *)logged + sizeof(string_item); | |
1084 | memcpy(logged->text, text, length); | |
1085 | logged->next = acl_warn_logged; | |
1086 | acl_warn_logged = logged; | |
1087 | } | |
1088 | } | |
1089 | ||
1090 | /* If there's no user message, we are done. */ | |
1091 | ||
1092 | if (user_message == NULL) return; | |
1093 | ||
1094 | /* If this isn't a message ACL, we can't do anything with a user message. | |
1095 | Log an error. */ | |
1096 | ||
1097 | if (where > ACL_WHERE_NOTSMTP) | |
1098 | { | |
1099 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting " | |
1100 | "found in a non-message (%s) ACL: cannot specify header lines here: " | |
1101 | "message ignored", acl_wherenames[where]); | |
1102 | return; | |
1103 | } | |
1104 | ||
71fafd95 PH |
1105 | /* The code for setting up header lines is now abstracted into a separate |
1106 | function so that it can be used for the add_header modifier as well. */ | |
059ec3d9 | 1107 | |
71fafd95 | 1108 | setup_header(user_message); |
059ec3d9 PH |
1109 | } |
1110 | ||
1111 | ||
1112 | ||
1113 | /************************************************* | |
1114 | * Verify and check reverse DNS * | |
1115 | *************************************************/ | |
1116 | ||
1117 | /* Called from acl_verify() below. We look up the host name(s) of the client IP | |
1118 | address if this has not yet been done. The host_name_lookup() function checks | |
1119 | that one of these names resolves to an address list that contains the client IP | |
1120 | address, so we don't actually have to do the check here. | |
1121 | ||
1122 | Arguments: | |
1123 | user_msgptr pointer for user message | |
1124 | log_msgptr pointer for log message | |
1125 | ||
1126 | Returns: OK verification condition succeeded | |
1127 | FAIL verification failed | |
1128 | DEFER there was a problem verifying | |
1129 | */ | |
1130 | ||
1131 | static int | |
1132 | acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr) | |
1133 | { | |
1134 | int rc; | |
1135 | ||
1136 | user_msgptr = user_msgptr; /* stop compiler warning */ | |
1137 | ||
1138 | /* Previous success */ | |
1139 | ||
1140 | if (sender_host_name != NULL) return OK; | |
1141 | ||
1142 | /* Previous failure */ | |
1143 | ||
1144 | if (host_lookup_failed) | |
1145 | { | |
1146 | *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg); | |
1147 | return FAIL; | |
1148 | } | |
1149 | ||
1150 | /* Need to do a lookup */ | |
1151 | ||
1152 | HDEBUG(D_acl) | |
1153 | debug_printf("looking up host name to force name/address consistency check\n"); | |
1154 | ||
1155 | if ((rc = host_name_lookup()) != OK) | |
1156 | { | |
1157 | *log_msgptr = (rc == DEFER)? | |
1158 | US"host lookup deferred for reverse lookup check" | |
1159 | : | |
1160 | string_sprintf("host lookup failed for reverse lookup check%s", | |
1161 | host_lookup_msg); | |
1162 | return rc; /* DEFER or FAIL */ | |
1163 | } | |
1164 | ||
1165 | host_build_sender_fullhost(); | |
1166 | return OK; | |
1167 | } | |
1168 | ||
1169 | ||
1170 | ||
e5a9dba6 PH |
1171 | /************************************************* |
1172 | * Check client IP address matches CSA target * | |
1173 | *************************************************/ | |
1174 | ||
1175 | /* Called from acl_verify_csa() below. This routine scans a section of a DNS | |
1176 | response for address records belonging to the CSA target hostname. The section | |
1177 | is specified by the reset argument, either RESET_ADDITIONAL or RESET_ANSWERS. | |
1178 | If one of the addresses matches the client's IP address, then the client is | |
1179 | authorized by CSA. If there are target IP addresses but none of them match | |
1180 | then the client is using an unauthorized IP address. If there are no target IP | |
1181 | addresses then the client cannot be using an authorized IP address. (This is | |
1182 | an odd configuration - why didn't the SRV record have a weight of 1 instead?) | |
1183 | ||
1184 | Arguments: | |
1185 | dnsa the DNS answer block | |
1186 | dnss a DNS scan block for us to use | |
1187 | reset option specifing what portion to scan, as described above | |
1188 | target the target hostname to use for matching RR names | |
1189 | ||
1190 | Returns: CSA_OK successfully authorized | |
1191 | CSA_FAIL_MISMATCH addresses found but none matched | |
1192 | CSA_FAIL_NOADDR no target addresses found | |
1193 | */ | |
1194 | ||
1195 | static int | |
1196 | acl_verify_csa_address(dns_answer *dnsa, dns_scan *dnss, int reset, | |
1197 | uschar *target) | |
1198 | { | |
1199 | dns_record *rr; | |
1200 | dns_address *da; | |
1201 | ||
1202 | BOOL target_found = FALSE; | |
1203 | ||
1204 | for (rr = dns_next_rr(dnsa, dnss, reset); | |
1205 | rr != NULL; | |
1206 | rr = dns_next_rr(dnsa, dnss, RESET_NEXT)) | |
1207 | { | |
1208 | /* Check this is an address RR for the target hostname. */ | |
1209 | ||
1210 | if (rr->type != T_A | |
1211 | #if HAVE_IPV6 | |
1212 | && rr->type != T_AAAA | |
1213 | #ifdef SUPPORT_A6 | |
1214 | && rr->type != T_A6 | |
1215 | #endif | |
1216 | #endif | |
1217 | ) continue; | |
1218 | ||
1219 | if (strcmpic(target, rr->name) != 0) continue; | |
1220 | ||
1221 | target_found = TRUE; | |
1222 | ||
1223 | /* Turn the target address RR into a list of textual IP addresses and scan | |
1224 | the list. There may be more than one if it is an A6 RR. */ | |
1225 | ||
1226 | for (da = dns_address_from_rr(dnsa, rr); da != NULL; da = da->next) | |
1227 | { | |
1228 | /* If the client IP address matches the target IP address, it's good! */ | |
1229 | ||
1230 | DEBUG(D_acl) debug_printf("CSA target address is %s\n", da->address); | |
1231 | ||
1232 | if (strcmpic(sender_host_address, da->address) == 0) return CSA_OK; | |
1233 | } | |
1234 | } | |
1235 | ||
1236 | /* If we found some target addresses but none of them matched, the client is | |
1237 | using an unauthorized IP address, otherwise the target has no authorized IP | |
1238 | addresses. */ | |
1239 | ||
1240 | if (target_found) return CSA_FAIL_MISMATCH; | |
1241 | else return CSA_FAIL_NOADDR; | |
1242 | } | |
1243 | ||
1244 | ||
1245 | ||
1246 | /************************************************* | |
1247 | * Verify Client SMTP Authorization * | |
1248 | *************************************************/ | |
1249 | ||
1250 | /* Called from acl_verify() below. This routine calls dns_lookup_special() | |
1251 | to find the CSA SRV record corresponding to the domain argument, or | |
1252 | $sender_helo_name if no argument is provided. It then checks that the | |
1253 | client is authorized, and that its IP address corresponds to the SRV | |
1254 | target's address by calling acl_verify_csa_address() above. The address | |
1255 | should have been returned in the DNS response's ADDITIONAL section, but if | |
1256 | not we perform another DNS lookup to get it. | |
1257 | ||
1258 | Arguments: | |
1259 | domain pointer to optional parameter following verify = csa | |
1260 | ||
1261 | Returns: CSA_UNKNOWN no valid CSA record found | |
1262 | CSA_OK successfully authorized | |
1263 | CSA_FAIL_* client is definitely not authorized | |
1264 | CSA_DEFER_* there was a DNS problem | |
1265 | */ | |
1266 | ||
1267 | static int | |
1268 | acl_verify_csa(uschar *domain) | |
1269 | { | |
1270 | tree_node *t; | |
1271 | uschar *found, *p; | |
1272 | int priority, weight, port; | |
1273 | dns_answer dnsa; | |
1274 | dns_scan dnss; | |
1275 | dns_record *rr; | |
1276 | int rc, type; | |
1277 | uschar target[256]; | |
1278 | ||
1279 | /* Work out the domain we are using for the CSA lookup. The default is the | |
1280 | client's HELO domain. If the client has not said HELO, use its IP address | |
1281 | instead. If it's a local client (exim -bs), CSA isn't applicable. */ | |
1282 | ||
1283 | while (isspace(*domain) && *domain != '\0') ++domain; | |
1284 | if (*domain == '\0') domain = sender_helo_name; | |
1285 | if (domain == NULL) domain = sender_host_address; | |
1286 | if (sender_host_address == NULL) return CSA_UNKNOWN; | |
1287 | ||
1288 | /* If we have an address literal, strip off the framing ready for turning it | |
1289 | into a domain. The framing consists of matched square brackets possibly | |
1290 | containing a keyword and a colon before the actual IP address. */ | |
1291 | ||
1292 | if (domain[0] == '[') | |
1293 | { | |
1294 | uschar *start = Ustrchr(domain, ':'); | |
1295 | if (start == NULL) start = domain; | |
1296 | domain = string_copyn(start + 1, Ustrlen(start) - 2); | |
1297 | } | |
1298 | ||
1299 | /* Turn domains that look like bare IP addresses into domains in the reverse | |
1300 | DNS. This code also deals with address literals and $sender_host_address. It's | |
1301 | not quite kosher to treat bare domains such as EHLO 192.0.2.57 the same as | |
1302 | address literals, but it's probably the most friendly thing to do. This is an | |
1303 | extension to CSA, so we allow it to be turned off for proper conformance. */ | |
1304 | ||
7e66e54d | 1305 | if (string_is_ip_address(domain, NULL) != 0) |
e5a9dba6 PH |
1306 | { |
1307 | if (!dns_csa_use_reverse) return CSA_UNKNOWN; | |
1308 | dns_build_reverse(domain, target); | |
1309 | domain = target; | |
1310 | } | |
1311 | ||
1312 | /* Find out if we've already done the CSA check for this domain. If we have, | |
1313 | return the same result again. Otherwise build a new cached result structure | |
1314 | for this domain. The name is filled in now, and the value is filled in when | |
1315 | we return from this function. */ | |
1316 | ||
1317 | t = tree_search(csa_cache, domain); | |
1318 | if (t != NULL) return t->data.val; | |
1319 | ||
1320 | t = store_get_perm(sizeof(tree_node) + Ustrlen(domain)); | |
1321 | Ustrcpy(t->name, domain); | |
1322 | (void)tree_insertnode(&csa_cache, t); | |
1323 | ||
1324 | /* Now we are ready to do the actual DNS lookup(s). */ | |
1325 | ||
28e6ef29 | 1326 | found = domain; |
e5a9dba6 PH |
1327 | switch (dns_special_lookup(&dnsa, domain, T_CSA, &found)) |
1328 | { | |
1329 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1330 | ||
1331 | default: | |
1332 | return t->data.val = CSA_DEFER_SRV; | |
1333 | ||
1334 | /* If we found nothing, the client's authorization is unknown. */ | |
1335 | ||
1336 | case DNS_NOMATCH: | |
1337 | case DNS_NODATA: | |
1338 | return t->data.val = CSA_UNKNOWN; | |
1339 | ||
1340 | /* We got something! Go on to look at the reply in more detail. */ | |
1341 | ||
1342 | case DNS_SUCCEED: | |
1343 | break; | |
1344 | } | |
1345 | ||
1346 | /* Scan the reply for well-formed CSA SRV records. */ | |
1347 | ||
1348 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
1349 | rr != NULL; | |
1350 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
1351 | { | |
1352 | if (rr->type != T_SRV) continue; | |
1353 | ||
1354 | /* Extract the numerical SRV fields (p is incremented) */ | |
1355 | ||
1356 | p = rr->data; | |
1357 | GETSHORT(priority, p); | |
1358 | GETSHORT(weight, p); | |
1359 | GETSHORT(port, p); | |
1360 | ||
1361 | DEBUG(D_acl) | |
1362 | debug_printf("CSA priority=%d weight=%d port=%d\n", priority, weight, port); | |
1363 | ||
1364 | /* Check the CSA version number */ | |
1365 | ||
1366 | if (priority != 1) continue; | |
1367 | ||
1368 | /* If the domain does not have a CSA SRV record of its own (i.e. the domain | |
1369 | found by dns_special_lookup() is a parent of the one we asked for), we check | |
1370 | the subdomain assertions in the port field. At the moment there's only one | |
1371 | assertion: legitimate SMTP clients are all explicitly authorized with CSA | |
1372 | SRV records of their own. */ | |
1373 | ||
1374 | if (found != domain) | |
1375 | { | |
1376 | if (port & 1) | |
1377 | return t->data.val = CSA_FAIL_EXPLICIT; | |
1378 | else | |
1379 | return t->data.val = CSA_UNKNOWN; | |
1380 | } | |
1381 | ||
1382 | /* This CSA SRV record refers directly to our domain, so we check the value | |
1383 | in the weight field to work out the domain's authorization. 0 and 1 are | |
1384 | unauthorized; 3 means the client is authorized but we can't check the IP | |
1385 | address in order to authenticate it, so we treat it as unknown; values | |
1386 | greater than 3 are undefined. */ | |
1387 | ||
1388 | if (weight < 2) return t->data.val = CSA_FAIL_DOMAIN; | |
1389 | ||
1390 | if (weight > 2) continue; | |
1391 | ||
1392 | /* Weight == 2, which means the domain is authorized. We must check that the | |
1393 | client's IP address is listed as one of the SRV target addresses. Save the | |
1394 | target hostname then break to scan the additional data for its addresses. */ | |
1395 | ||
1396 | (void)dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, | |
1397 | (DN_EXPAND_ARG4_TYPE)target, sizeof(target)); | |
1398 | ||
1399 | DEBUG(D_acl) debug_printf("CSA target is %s\n", target); | |
1400 | ||
1401 | break; | |
1402 | } | |
1403 | ||
1404 | /* If we didn't break the loop then no appropriate records were found. */ | |
1405 | ||
1406 | if (rr == NULL) return t->data.val = CSA_UNKNOWN; | |
1407 | ||
1408 | /* Do not check addresses if the target is ".", in accordance with RFC 2782. | |
1409 | A target of "." indicates there are no valid addresses, so the client cannot | |
1410 | be authorized. (This is an odd configuration because weight=2 target=. is | |
1411 | equivalent to weight=1, but we check for it in order to keep load off the | |
1412 | root name servers.) Note that dn_expand() turns "." into "". */ | |
1413 | ||
1414 | if (Ustrcmp(target, "") == 0) return t->data.val = CSA_FAIL_NOADDR; | |
1415 | ||
1416 | /* Scan the additional section of the CSA SRV reply for addresses belonging | |
1417 | to the target. If the name server didn't return any additional data (e.g. | |
1418 | because it does not fully support SRV records), we need to do another lookup | |
1419 | to obtain the target addresses; otherwise we have a definitive result. */ | |
1420 | ||
1421 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ADDITIONAL, target); | |
1422 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1423 | ||
1424 | /* The DNS lookup type corresponds to the IP version used by the client. */ | |
1425 | ||
1426 | #if HAVE_IPV6 | |
1427 | if (Ustrchr(sender_host_address, ':') != NULL) | |
1428 | type = T_AAAA; | |
1429 | else | |
1430 | #endif /* HAVE_IPV6 */ | |
1431 | type = T_A; | |
1432 | ||
1433 | ||
1434 | #if HAVE_IPV6 && defined(SUPPORT_A6) | |
1435 | DNS_LOOKUP_AGAIN: | |
1436 | #endif | |
1437 | ||
1438 | switch (dns_lookup(&dnsa, target, type, NULL)) | |
1439 | { | |
1440 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1441 | ||
1442 | default: | |
1443 | return t->data.val = CSA_DEFER_ADDR; | |
1444 | ||
1445 | /* If the query succeeded, scan the addresses and return the result. */ | |
1446 | ||
1447 | case DNS_SUCCEED: | |
1448 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ANSWERS, target); | |
1449 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1450 | /* else fall through */ | |
1451 | ||
1452 | /* If the target has no IP addresses, the client cannot have an authorized | |
1453 | IP address. However, if the target site uses A6 records (not AAAA records) | |
1454 | we have to do yet another lookup in order to check them. */ | |
1455 | ||
1456 | case DNS_NOMATCH: | |
1457 | case DNS_NODATA: | |
1458 | ||
1459 | #if HAVE_IPV6 && defined(SUPPORT_A6) | |
1460 | if (type == T_AAAA) { type = T_A6; goto DNS_LOOKUP_AGAIN; } | |
1461 | #endif | |
1462 | ||
1463 | return t->data.val = CSA_FAIL_NOADDR; | |
1464 | } | |
1465 | } | |
1466 | ||
1467 | ||
1468 | ||
059ec3d9 PH |
1469 | /************************************************* |
1470 | * Handle verification (address & other) * | |
1471 | *************************************************/ | |
1472 | ||
1473 | /* This function implements the "verify" condition. It is called when | |
1474 | encountered in any ACL, because some tests are almost always permitted. Some | |
1475 | just don't make sense, and always fail (for example, an attempt to test a host | |
1476 | lookup for a non-TCP/IP message). Others are restricted to certain ACLs. | |
1477 | ||
1478 | Arguments: | |
1479 | where where called from | |
1480 | addr the recipient address that the ACL is handling, or NULL | |
1481 | arg the argument of "verify" | |
1482 | user_msgptr pointer for user message | |
1483 | log_msgptr pointer for log message | |
1484 | basic_errno where to put verify errno | |
1485 | ||
1486 | Returns: OK verification condition succeeded | |
1487 | FAIL verification failed | |
1488 | DEFER there was a problem verifying | |
1489 | ERROR syntax error | |
1490 | */ | |
1491 | ||
1492 | static int | |
1493 | acl_verify(int where, address_item *addr, uschar *arg, | |
1494 | uschar **user_msgptr, uschar **log_msgptr, int *basic_errno) | |
1495 | { | |
1496 | int sep = '/'; | |
1497 | int callout = -1; | |
1498 | int callout_overall = -1; | |
4deaf07d | 1499 | int callout_connect = -1; |
059ec3d9 PH |
1500 | int verify_options = 0; |
1501 | int rc; | |
1502 | BOOL verify_header_sender = FALSE; | |
1503 | BOOL defer_ok = FALSE; | |
1504 | BOOL callout_defer_ok = FALSE; | |
1505 | BOOL no_details = FALSE; | |
eafd343b | 1506 | BOOL success_on_redirect = FALSE; |
059ec3d9 PH |
1507 | address_item *sender_vaddr = NULL; |
1508 | uschar *verify_sender_address = NULL; | |
1509 | uschar *pm_mailfrom = NULL; | |
1510 | uschar *se_mailfrom = NULL; | |
596875b3 PH |
1511 | |
1512 | /* Some of the verify items have slash-separated options; some do not. Diagnose | |
1513 | an error if options are given for items that don't expect them. This code has | |
1514 | now got very message. Refactoring to use a table would be a good idea one day. | |
1515 | */ | |
1516 | ||
1517 | uschar *slash = Ustrchr(arg, '/'); | |
059ec3d9 PH |
1518 | uschar *list = arg; |
1519 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
1520 | ||
1521 | if (ss == NULL) goto BAD_VERIFY; | |
1522 | ||
1523 | /* Handle name/address consistency verification in a separate function. */ | |
1524 | ||
1525 | if (strcmpic(ss, US"reverse_host_lookup") == 0) | |
1526 | { | |
596875b3 | 1527 | if (slash != NULL) goto NO_OPTIONS; |
059ec3d9 PH |
1528 | if (sender_host_address == NULL) return OK; |
1529 | return acl_verify_reverse(user_msgptr, log_msgptr); | |
1530 | } | |
1531 | ||
1532 | /* TLS certificate verification is done at STARTTLS time; here we just | |
1533 | test whether it was successful or not. (This is for optional verification; for | |
1534 | mandatory verification, the connection doesn't last this long.) */ | |
1535 | ||
1536 | if (strcmpic(ss, US"certificate") == 0) | |
1537 | { | |
596875b3 | 1538 | if (slash != NULL) goto NO_OPTIONS; |
059ec3d9 PH |
1539 | if (tls_certificate_verified) return OK; |
1540 | *user_msgptr = US"no verified certificate"; | |
1541 | return FAIL; | |
1542 | } | |
1543 | ||
d7b47fd0 PH |
1544 | /* We can test the result of optional HELO verification that might have |
1545 | occurred earlier. If not, we can attempt the verification now. */ | |
059ec3d9 | 1546 | |
596875b3 PH |
1547 | if (strcmpic(ss, US"helo") == 0) |
1548 | { | |
1549 | if (slash != NULL) goto NO_OPTIONS; | |
0154e85a TF |
1550 | if (!helo_verified && !helo_verify_failed) smtp_verify_helo(); |
1551 | return helo_verified? OK : FAIL; | |
596875b3 | 1552 | } |
059ec3d9 | 1553 | |
e5a9dba6 PH |
1554 | /* Do Client SMTP Authorization checks in a separate function, and turn the |
1555 | result code into user-friendly strings. */ | |
1556 | ||
1557 | if (strcmpic(ss, US"csa") == 0) | |
1558 | { | |
1559 | rc = acl_verify_csa(list); | |
1560 | *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s", | |
1561 | csa_reason_string[rc]); | |
1562 | csa_status = csa_status_string[rc]; | |
1563 | DEBUG(D_acl) debug_printf("CSA result %s\n", csa_status); | |
1564 | return csa_return_code[rc]; | |
1565 | } | |
1566 | ||
596875b3 PH |
1567 | /* Check that all relevant header lines have the correct syntax. If there is |
1568 | a syntax error, we return details of the error to the sender if configured to | |
1569 | send out full details. (But a "message" setting on the ACL can override, as | |
1570 | always). */ | |
059ec3d9 | 1571 | |
596875b3 | 1572 | if (strcmpic(ss, US"header_syntax") == 0) |
059ec3d9 | 1573 | { |
596875b3 | 1574 | if (slash != NULL) goto NO_OPTIONS; |
1c41c9cc | 1575 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; |
596875b3 PH |
1576 | rc = verify_check_headers(log_msgptr); |
1577 | if (rc != OK && smtp_return_error_details && *log_msgptr != NULL) | |
1578 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1579 | return rc; | |
1580 | } | |
059ec3d9 | 1581 | |
1c41c9cc PH |
1582 | /* Check that no recipient of this message is "blind", that is, every envelope |
1583 | recipient must be mentioned in either To: or Cc:. */ | |
1584 | ||
1585 | if (strcmpic(ss, US"not_blind") == 0) | |
1586 | { | |
1587 | if (slash != NULL) goto NO_OPTIONS; | |
1588 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; | |
1589 | rc = verify_check_notblind(); | |
1590 | if (rc != OK) | |
1591 | { | |
1592 | *log_msgptr = string_sprintf("bcc recipient detected"); | |
1593 | if (smtp_return_error_details) | |
1594 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1595 | } | |
1596 | return rc; | |
1597 | } | |
059ec3d9 | 1598 | |
596875b3 PH |
1599 | /* The remaining verification tests check recipient and sender addresses, |
1600 | either from the envelope or from the header. There are a number of | |
1601 | slash-separated options that are common to all of them. */ | |
059ec3d9 | 1602 | |
059ec3d9 | 1603 | |
596875b3 PH |
1604 | /* Check that there is at least one verifiable sender address in the relevant |
1605 | header lines. This can be followed by callout and defer options, just like | |
1606 | sender and recipient. */ | |
059ec3d9 | 1607 | |
596875b3 PH |
1608 | if (strcmpic(ss, US"header_sender") == 0) |
1609 | { | |
1c41c9cc | 1610 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; |
596875b3 | 1611 | verify_header_sender = TRUE; |
059ec3d9 PH |
1612 | } |
1613 | ||
1614 | /* Otherwise, first item in verify argument must be "sender" or "recipient". | |
1615 | In the case of a sender, this can optionally be followed by an address to use | |
1616 | in place of the actual sender (rare special-case requirement). */ | |
1617 | ||
1618 | else if (strncmpic(ss, US"sender", 6) == 0) | |
1619 | { | |
1620 | uschar *s = ss + 6; | |
1621 | if (where > ACL_WHERE_NOTSMTP) | |
1622 | { | |
1623 | *log_msgptr = string_sprintf("cannot verify sender in ACL for %s " | |
1624 | "(only possible for MAIL, RCPT, PREDATA, or DATA)", | |
1625 | acl_wherenames[where]); | |
1626 | return ERROR; | |
1627 | } | |
1628 | if (*s == 0) | |
1629 | verify_sender_address = sender_address; | |
1630 | else | |
1631 | { | |
1632 | while (isspace(*s)) s++; | |
1633 | if (*s++ != '=') goto BAD_VERIFY; | |
1634 | while (isspace(*s)) s++; | |
1635 | verify_sender_address = string_copy(s); | |
1636 | } | |
1637 | } | |
1638 | else | |
1639 | { | |
1640 | if (strcmpic(ss, US"recipient") != 0) goto BAD_VERIFY; | |
1641 | if (addr == NULL) | |
1642 | { | |
1643 | *log_msgptr = string_sprintf("cannot verify recipient in ACL for %s " | |
1644 | "(only possible for RCPT)", acl_wherenames[where]); | |
1645 | return ERROR; | |
1646 | } | |
1647 | } | |
1648 | ||
596875b3 PH |
1649 | /* Remaining items are optional; they apply to sender and recipient |
1650 | verification, including "header sender" verification. */ | |
059ec3d9 PH |
1651 | |
1652 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) | |
1653 | != NULL) | |
1654 | { | |
1655 | if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE; | |
1656 | else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE; | |
eafd343b | 1657 | else if (strcmpic(ss, US"success_on_redirect") == 0) success_on_redirect = TRUE; |
059ec3d9 PH |
1658 | |
1659 | /* These two old options are left for backwards compatibility */ | |
1660 | ||
1661 | else if (strcmpic(ss, US"callout_defer_ok") == 0) | |
1662 | { | |
1663 | callout_defer_ok = TRUE; | |
1664 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1665 | } | |
1666 | ||
1667 | else if (strcmpic(ss, US"check_postmaster") == 0) | |
1668 | { | |
1669 | pm_mailfrom = US""; | |
1670 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1671 | } | |
1672 | ||
1673 | /* The callout option has a number of sub-options, comma separated */ | |
1674 | ||
1675 | else if (strncmpic(ss, US"callout", 7) == 0) | |
1676 | { | |
1677 | callout = CALLOUT_TIMEOUT_DEFAULT; | |
1678 | ss += 7; | |
1679 | if (*ss != 0) | |
1680 | { | |
1681 | while (isspace(*ss)) ss++; | |
1682 | if (*ss++ == '=') | |
1683 | { | |
1684 | int optsep = ','; | |
1685 | uschar *opt; | |
1686 | uschar buffer[256]; | |
1687 | while (isspace(*ss)) ss++; | |
8e669ac1 PH |
1688 | |
1689 | /* This callout option handling code has become a mess as new options | |
1690 | have been added in an ad hoc manner. It should be tidied up into some | |
4deaf07d | 1691 | kind of table-driven thing. */ |
8e669ac1 | 1692 | |
059ec3d9 PH |
1693 | while ((opt = string_nextinlist(&ss, &optsep, buffer, sizeof(buffer))) |
1694 | != NULL) | |
1695 | { | |
1696 | if (strcmpic(opt, US"defer_ok") == 0) callout_defer_ok = TRUE; | |
1697 | else if (strcmpic(opt, US"no_cache") == 0) | |
1698 | verify_options |= vopt_callout_no_cache; | |
1699 | else if (strcmpic(opt, US"random") == 0) | |
1700 | verify_options |= vopt_callout_random; | |
1701 | else if (strcmpic(opt, US"use_sender") == 0) | |
1702 | verify_options |= vopt_callout_recipsender; | |
1703 | else if (strcmpic(opt, US"use_postmaster") == 0) | |
1704 | verify_options |= vopt_callout_recippmaster; | |
1705 | else if (strcmpic(opt, US"postmaster") == 0) pm_mailfrom = US""; | |
2a4be8f9 PH |
1706 | else if (strcmpic(opt, US"fullpostmaster") == 0) |
1707 | { | |
1708 | pm_mailfrom = US""; | |
1709 | verify_options |= vopt_callout_fullpm; | |
1710 | } | |
059ec3d9 PH |
1711 | |
1712 | else if (strncmpic(opt, US"mailfrom", 8) == 0) | |
1713 | { | |
1714 | if (!verify_header_sender) | |
1715 | { | |
1716 | *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a " | |
1717 | "callout option only for verify=header_sender (detected in ACL " | |
1718 | "condition \"%s\")", arg); | |
1719 | return ERROR; | |
1720 | } | |
1721 | opt += 8; | |
1722 | while (isspace(*opt)) opt++; | |
1723 | if (*opt++ != '=') | |
1724 | { | |
1725 | *log_msgptr = string_sprintf("'=' expected after " | |
1726 | "\"mailfrom\" in ACL condition \"%s\"", arg); | |
1727 | return ERROR; | |
1728 | } | |
1729 | while (isspace(*opt)) opt++; | |
1730 | se_mailfrom = string_copy(opt); | |
1731 | } | |
1732 | ||
1733 | else if (strncmpic(opt, US"postmaster_mailfrom", 19) == 0) | |
1734 | { | |
1735 | opt += 19; | |
1736 | while (isspace(*opt)) opt++; | |
1737 | if (*opt++ != '=') | |
1738 | { | |
1739 | *log_msgptr = string_sprintf("'=' expected after " | |
1740 | "\"postmaster_mailfrom\" in ACL condition \"%s\"", arg); | |
1741 | return ERROR; | |
1742 | } | |
1743 | while (isspace(*opt)) opt++; | |
1744 | pm_mailfrom = string_copy(opt); | |
1745 | } | |
1746 | ||
1747 | else if (strncmpic(opt, US"maxwait", 7) == 0) | |
1748 | { | |
1749 | opt += 7; | |
1750 | while (isspace(*opt)) opt++; | |
1751 | if (*opt++ != '=') | |
1752 | { | |
1753 | *log_msgptr = string_sprintf("'=' expected after \"maxwait\" in " | |
1754 | "ACL condition \"%s\"", arg); | |
1755 | return ERROR; | |
1756 | } | |
1757 | while (isspace(*opt)) opt++; | |
1758 | callout_overall = readconf_readtime(opt, 0, FALSE); | |
1759 | if (callout_overall < 0) | |
1760 | { | |
1761 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1762 | "\"verify %s\"", arg); | |
1763 | return ERROR; | |
1764 | } | |
1765 | } | |
4deaf07d PH |
1766 | else if (strncmpic(opt, US"connect", 7) == 0) |
1767 | { | |
1768 | opt += 7; | |
1769 | while (isspace(*opt)) opt++; | |
1770 | if (*opt++ != '=') | |
1771 | { | |
1772 | *log_msgptr = string_sprintf("'=' expected after " | |
1773 | "\"callout_overaall\" in ACL condition \"%s\"", arg); | |
1774 | return ERROR; | |
1775 | } | |
1776 | while (isspace(*opt)) opt++; | |
1777 | callout_connect = readconf_readtime(opt, 0, FALSE); | |
1778 | if (callout_connect < 0) | |
1779 | { | |
1780 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1781 | "\"verify %s\"", arg); | |
1782 | return ERROR; | |
1783 | } | |
1784 | } | |
059ec3d9 PH |
1785 | else /* Plain time is callout connect/command timeout */ |
1786 | { | |
1787 | callout = readconf_readtime(opt, 0, FALSE); | |
1788 | if (callout < 0) | |
1789 | { | |
1790 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1791 | "\"verify %s\"", arg); | |
1792 | return ERROR; | |
1793 | } | |
1794 | } | |
1795 | } | |
1796 | } | |
1797 | else | |
1798 | { | |
1799 | *log_msgptr = string_sprintf("'=' expected after \"callout\" in " | |
1800 | "ACL condition \"%s\"", arg); | |
1801 | return ERROR; | |
1802 | } | |
1803 | } | |
1804 | } | |
1805 | ||
1806 | /* Option not recognized */ | |
1807 | ||
1808 | else | |
1809 | { | |
1810 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " | |
1811 | "condition \"verify %s\"", ss, arg); | |
1812 | return ERROR; | |
1813 | } | |
1814 | } | |
1815 | ||
1816 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == | |
1817 | (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1818 | { | |
1819 | *log_msgptr = US"only one of use_sender and use_postmaster can be set " | |
1820 | "for a recipient callout"; | |
1821 | return ERROR; | |
1822 | } | |
1823 | ||
1824 | /* Handle sender-in-header verification. Default the user message to the log | |
1825 | message if giving out verification details. */ | |
1826 | ||
1827 | if (verify_header_sender) | |
1828 | { | |
8e669ac1 | 1829 | int verrno; |
059ec3d9 | 1830 | rc = verify_check_header_address(user_msgptr, log_msgptr, callout, |
fe5b5d0b PH |
1831 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, verify_options, |
1832 | &verrno); | |
1833 | if (rc != OK) | |
8e669ac1 | 1834 | { |
fe5b5d0b PH |
1835 | *basic_errno = verrno; |
1836 | if (smtp_return_error_details) | |
1837 | { | |
1838 | if (*user_msgptr == NULL && *log_msgptr != NULL) | |
1839 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1840 | if (rc == DEFER) acl_temp_details = TRUE; | |
1841 | } | |
8e669ac1 | 1842 | } |
059ec3d9 PH |
1843 | } |
1844 | ||
1845 | /* Handle a sender address. The default is to verify *the* sender address, but | |
1846 | optionally a different address can be given, for special requirements. If the | |
1847 | address is empty, we are dealing with a bounce message that has no sender, so | |
1848 | we cannot do any checking. If the real sender address gets rewritten during | |
1849 | verification (e.g. DNS widening), set the flag to stop it being rewritten again | |
1850 | during message reception. | |
1851 | ||
1852 | A list of verified "sender" addresses is kept to try to avoid doing to much | |
1853 | work repetitively when there are multiple recipients in a message and they all | |
1854 | require sender verification. However, when callouts are involved, it gets too | |
1855 | complicated because different recipients may require different callout options. | |
1856 | Therefore, we always do a full sender verify when any kind of callout is | |
1857 | specified. Caching elsewhere, for instance in the DNS resolver and in the | |
1858 | callout handling, should ensure that this is not terribly inefficient. */ | |
1859 | ||
1860 | else if (verify_sender_address != NULL) | |
1861 | { | |
1862 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1863 | != 0) | |
1864 | { | |
1865 | *log_msgptr = US"use_sender or use_postmaster cannot be used for a " | |
1866 | "sender verify callout"; | |
1867 | return ERROR; | |
1868 | } | |
1869 | ||
1870 | sender_vaddr = verify_checked_sender(verify_sender_address); | |
1871 | if (sender_vaddr != NULL && /* Previously checked */ | |
1872 | callout <= 0) /* No callout needed this time */ | |
1873 | { | |
1874 | /* If the "routed" flag is set, it means that routing worked before, so | |
1875 | this check can give OK (the saved return code value, if set, belongs to a | |
1876 | callout that was done previously). If the "routed" flag is not set, routing | |
1877 | must have failed, so we use the saved return code. */ | |
1878 | ||
1879 | if (testflag(sender_vaddr, af_verify_routed)) rc = OK; else | |
1880 | { | |
1881 | rc = sender_vaddr->special_action; | |
1882 | *basic_errno = sender_vaddr->basic_errno; | |
1883 | } | |
1884 | HDEBUG(D_acl) debug_printf("using cached sender verify result\n"); | |
1885 | } | |
1886 | ||
1887 | /* Do a new verification, and cache the result. The cache is used to avoid | |
1888 | verifying the sender multiple times for multiple RCPTs when callouts are not | |
1889 | specified (see comments above). | |
1890 | ||
1891 | The cache is also used on failure to give details in response to the first | |
1892 | RCPT that gets bounced for this reason. However, this can be suppressed by | |
1893 | the no_details option, which sets the flag that says "this detail has already | |
1894 | been sent". The cache normally contains just one address, but there may be | |
1895 | more in esoteric circumstances. */ | |
1896 | ||
1897 | else | |
1898 | { | |
1899 | BOOL routed = TRUE; | |
2a3eea10 | 1900 | uschar *save_address_data = deliver_address_data; |
8e669ac1 | 1901 | |
059ec3d9 PH |
1902 | sender_vaddr = deliver_make_addr(verify_sender_address, TRUE); |
1903 | if (no_details) setflag(sender_vaddr, af_sverify_told); | |
1904 | if (verify_sender_address[0] != 0) | |
1905 | { | |
1906 | /* If this is the real sender address, save the unrewritten version | |
1907 | for use later in receive. Otherwise, set a flag so that rewriting the | |
1908 | sender in verify_address() does not update sender_address. */ | |
1909 | ||
1910 | if (verify_sender_address == sender_address) | |
1911 | sender_address_unrewritten = sender_address; | |
1912 | else | |
1913 | verify_options |= vopt_fake_sender; | |
1914 | ||
eafd343b TK |
1915 | if (success_on_redirect) |
1916 | verify_options |= vopt_success_on_redirect; | |
1917 | ||
059ec3d9 PH |
1918 | /* The recipient, qualify, and expn options are never set in |
1919 | verify_options. */ | |
1920 | ||
1921 | rc = verify_address(sender_vaddr, NULL, verify_options, callout, | |
4deaf07d | 1922 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, &routed); |
059ec3d9 PH |
1923 | |
1924 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); | |
1925 | ||
1926 | if (rc == OK) | |
1927 | { | |
1928 | if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0) | |
1929 | { | |
1930 | DEBUG(D_acl) debug_printf("sender %s verified ok as %s\n", | |
1931 | verify_sender_address, sender_vaddr->address); | |
1932 | } | |
1933 | else | |
1934 | { | |
1935 | DEBUG(D_acl) debug_printf("sender %s verified ok\n", | |
1936 | verify_sender_address); | |
1937 | } | |
1938 | } | |
1939 | else *basic_errno = sender_vaddr->basic_errno; | |
1940 | } | |
1941 | else rc = OK; /* Null sender */ | |
1942 | ||
1943 | /* Cache the result code */ | |
1944 | ||
1945 | if (routed) setflag(sender_vaddr, af_verify_routed); | |
1946 | if (callout > 0) setflag(sender_vaddr, af_verify_callout); | |
1947 | sender_vaddr->special_action = rc; | |
1948 | sender_vaddr->next = sender_verified_list; | |
1949 | sender_verified_list = sender_vaddr; | |
8e669ac1 PH |
1950 | |
1951 | /* Restore the recipient address data, which might have been clobbered by | |
2a3eea10 | 1952 | the sender verification. */ |
8e669ac1 | 1953 | |
2a3eea10 | 1954 | deliver_address_data = save_address_data; |
059ec3d9 | 1955 | } |
8e669ac1 | 1956 | |
2a3eea10 PH |
1957 | /* Put the sender address_data value into $sender_address_data */ |
1958 | ||
8e669ac1 | 1959 | sender_address_data = sender_vaddr->p.address_data; |
059ec3d9 PH |
1960 | } |
1961 | ||
1962 | /* A recipient address just gets a straightforward verify; again we must handle | |
1963 | the DEFER overrides. */ | |
1964 | ||
1965 | else | |
1966 | { | |
1967 | address_item addr2; | |
1968 | ||
eafd343b TK |
1969 | if (success_on_redirect) |
1970 | verify_options |= vopt_success_on_redirect; | |
1971 | ||
059ec3d9 PH |
1972 | /* We must use a copy of the address for verification, because it might |
1973 | get rewritten. */ | |
1974 | ||
1975 | addr2 = *addr; | |
1976 | rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout, | |
4deaf07d | 1977 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, NULL); |
059ec3d9 | 1978 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); |
8e669ac1 | 1979 | |
42855d71 | 1980 | *basic_errno = addr2.basic_errno; |
059ec3d9 | 1981 | *log_msgptr = addr2.message; |
8e669ac1 | 1982 | *user_msgptr = (addr2.user_message != NULL)? |
6729cf78 | 1983 | addr2.user_message : addr2.message; |
42855d71 PH |
1984 | |
1985 | /* Allow details for temporary error if the address is so flagged. */ | |
1986 | if (testflag((&addr2), af_pass_message)) acl_temp_details = TRUE; | |
059ec3d9 PH |
1987 | |
1988 | /* Make $address_data visible */ | |
1989 | deliver_address_data = addr2.p.address_data; | |
1990 | } | |
1991 | ||
1992 | /* We have a result from the relevant test. Handle defer overrides first. */ | |
1993 | ||
1994 | if (rc == DEFER && (defer_ok || | |
1995 | (callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER))) | |
1996 | { | |
1997 | HDEBUG(D_acl) debug_printf("verify defer overridden by %s\n", | |
1998 | defer_ok? "defer_ok" : "callout_defer_ok"); | |
1999 | rc = OK; | |
2000 | } | |
2001 | ||
2002 | /* If we've failed a sender, set up a recipient message, and point | |
2003 | sender_verified_failed to the address item that actually failed. */ | |
2004 | ||
2005 | if (rc != OK && verify_sender_address != NULL) | |
2006 | { | |
2007 | if (rc != DEFER) | |
2008 | { | |
2009 | *log_msgptr = *user_msgptr = US"Sender verify failed"; | |
2010 | } | |
2011 | else if (*basic_errno != ERRNO_CALLOUTDEFER) | |
2012 | { | |
2013 | *log_msgptr = *user_msgptr = US"Could not complete sender verify"; | |
2014 | } | |
2015 | else | |
2016 | { | |
2017 | *log_msgptr = US"Could not complete sender verify callout"; | |
2018 | *user_msgptr = smtp_return_error_details? sender_vaddr->user_message : | |
2019 | *log_msgptr; | |
2020 | } | |
2021 | ||
2022 | sender_verified_failed = sender_vaddr; | |
2023 | } | |
2024 | ||
2025 | /* Verifying an address messes up the values of $domain and $local_part, | |
2026 | so reset them before returning if this is a RCPT ACL. */ | |
2027 | ||
2028 | if (addr != NULL) | |
2029 | { | |
2030 | deliver_domain = addr->domain; | |
2031 | deliver_localpart = addr->local_part; | |
2032 | } | |
2033 | return rc; | |
2034 | ||
2035 | /* Syntax errors in the verify argument come here. */ | |
2036 | ||
2037 | BAD_VERIFY: | |
2038 | *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", " | |
596875b3 PH |
2039 | "\"helo\", \"header_syntax\", \"header_sender\" or " |
2040 | "\"reverse_host_lookup\" at start of ACL condition " | |
059ec3d9 PH |
2041 | "\"verify %s\"", arg); |
2042 | return ERROR; | |
596875b3 PH |
2043 | |
2044 | /* Options supplied when not allowed come here */ | |
2045 | ||
2046 | NO_OPTIONS: | |
2047 | *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" " | |
2048 | "(this verify item has no options)", arg); | |
2049 | return ERROR; | |
1c41c9cc PH |
2050 | |
2051 | /* Calls in the wrong ACL come here */ | |
2052 | ||
2053 | WRONG_ACL: | |
2054 | *log_msgptr = string_sprintf("cannot check header contents in ACL for %s " | |
2055 | "(only possible in ACL for DATA)", acl_wherenames[where]); | |
2056 | return ERROR; | |
059ec3d9 PH |
2057 | } |
2058 | ||
2059 | ||
2060 | ||
2061 | ||
2062 | /************************************************* | |
2063 | * Check argument for control= modifier * | |
2064 | *************************************************/ | |
2065 | ||
2066 | /* Called from acl_check_condition() below | |
2067 | ||
2068 | Arguments: | |
2069 | arg the argument string for control= | |
2070 | pptr set to point to the terminating character | |
2071 | where which ACL we are in | |
2072 | log_msgptr for error messages | |
2073 | ||
2074 | Returns: CONTROL_xxx value | |
2075 | */ | |
2076 | ||
2077 | static int | |
2078 | decode_control(uschar *arg, uschar **pptr, int where, uschar **log_msgptr) | |
2079 | { | |
2080 | int len; | |
2081 | control_def *d; | |
2082 | ||
2083 | for (d = controls_list; | |
2084 | d < controls_list + sizeof(controls_list)/sizeof(control_def); | |
2085 | d++) | |
2086 | { | |
2087 | len = Ustrlen(d->name); | |
2088 | if (Ustrncmp(d->name, arg, len) == 0) break; | |
2089 | } | |
2090 | ||
2091 | if (d >= controls_list + sizeof(controls_list)/sizeof(control_def) || | |
2092 | (arg[len] != 0 && (!d->has_option || arg[len] != '/'))) | |
2093 | { | |
2094 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2095 | return CONTROL_ERROR; | |
2096 | } | |
2097 | ||
059ec3d9 PH |
2098 | *pptr = arg + len; |
2099 | return d->value; | |
2100 | } | |
2101 | ||
2102 | ||
2103 | ||
870f6ba8 TF |
2104 | /************************************************* |
2105 | * Handle rate limiting * | |
2106 | *************************************************/ | |
2107 | ||
2108 | /* Called by acl_check_condition() below to calculate the result | |
2109 | of the ACL ratelimit condition. | |
2110 | ||
2111 | Note that the return value might be slightly unexpected: if the | |
2112 | sender's rate is above the limit then the result is OK. This is | |
2113 | similar to the dnslists condition, and is so that you can write | |
2114 | ACL clauses like: defer ratelimit = 15 / 1h | |
2115 | ||
2116 | Arguments: | |
2117 | arg the option string for ratelimit= | |
90fc3069 | 2118 | where ACL_WHERE_xxxx indicating which ACL this is |
870f6ba8 TF |
2119 | log_msgptr for error messages |
2120 | ||
2121 | Returns: OK - Sender's rate is above limit | |
2122 | FAIL - Sender's rate is below limit | |
2123 | DEFER - Problem opening ratelimit database | |
2124 | ERROR - Syntax error in options. | |
2125 | */ | |
2126 | ||
2127 | static int | |
90fc3069 | 2128 | acl_ratelimit(uschar *arg, int where, uschar **log_msgptr) |
870f6ba8 TF |
2129 | { |
2130 | double limit, period; | |
8f240103 PH |
2131 | uschar *ss; |
2132 | uschar *key = NULL; | |
870f6ba8 | 2133 | int sep = '/'; |
8f240103 | 2134 | BOOL leaky = FALSE, strict = FALSE, noupdate = FALSE; |
870f6ba8 TF |
2135 | BOOL per_byte = FALSE, per_cmd = FALSE, per_conn = FALSE, per_mail = FALSE; |
2136 | int old_pool, rc; | |
2137 | tree_node **anchor, *t; | |
2138 | open_db dbblock, *dbm; | |
2139 | dbdata_ratelimit *dbd; | |
2140 | struct timeval tv; | |
2141 | ||
2142 | /* Parse the first two options and record their values in expansion | |
2143 | variables. These variables allow the configuration to have informative | |
2144 | error messages based on rate limits obtained from a table lookup. */ | |
2145 | ||
2146 | /* First is the maximum number of messages per period and maximum burst | |
2147 | size, which must be greater than or equal to zero. Zero is useful for | |
2148 | rate measurement as opposed to rate limiting. */ | |
2149 | ||
2150 | sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0); | |
2151 | if (sender_rate_limit == NULL) | |
2152 | limit = -1.0; | |
2153 | else | |
2154 | { | |
2155 | limit = Ustrtod(sender_rate_limit, &ss); | |
2156 | if (tolower(*ss) == 'k') { limit *= 1024.0; ss++; } | |
2157 | else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; } | |
2158 | else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; } | |
2159 | } | |
2160 | if (limit < 0.0 || *ss != 0) | |
2161 | { | |
2162 | *log_msgptr = string_sprintf("syntax error in argument for " | |
2163 | "\"ratelimit\" condition: \"%s\" is not a positive number", | |
2164 | sender_rate_limit); | |
2165 | return ERROR; | |
2166 | } | |
2167 | ||
2168 | /* Second is the rate measurement period and exponential smoothing time | |
2169 | constant. This must be strictly greater than zero, because zero leads to | |
2170 | run-time division errors. */ | |
2171 | ||
2172 | sender_rate_period = string_nextinlist(&arg, &sep, NULL, 0); | |
2173 | if (sender_rate_period == NULL) period = -1.0; | |
2174 | else period = readconf_readtime(sender_rate_period, 0, FALSE); | |
2175 | if (period <= 0.0) | |
2176 | { | |
2177 | *log_msgptr = string_sprintf("syntax error in argument for " | |
2178 | "\"ratelimit\" condition: \"%s\" is not a time value", | |
2179 | sender_rate_period); | |
2180 | return ERROR; | |
2181 | } | |
2182 | ||
2183 | /* Parse the other options. Should we check if the per_* options are being | |
2184 | used in ACLs where they don't make sense, e.g. per_mail in the connect ACL? */ | |
2185 | ||
2186 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2187 | != NULL) | |
2188 | { | |
2189 | if (strcmpic(ss, US"leaky") == 0) leaky = TRUE; | |
2190 | else if (strcmpic(ss, US"strict") == 0) strict = TRUE; | |
8f240103 | 2191 | else if (strcmpic(ss, US"noupdate") == 0) noupdate = TRUE; |
870f6ba8 | 2192 | else if (strcmpic(ss, US"per_byte") == 0) per_byte = TRUE; |
8f240103 PH |
2193 | else if (strcmpic(ss, US"per_cmd") == 0) per_cmd = TRUE; |
2194 | else if (strcmpic(ss, US"per_rcpt") == 0) per_cmd = TRUE; /* alias */ | |
870f6ba8 TF |
2195 | else if (strcmpic(ss, US"per_conn") == 0) per_conn = TRUE; |
2196 | else if (strcmpic(ss, US"per_mail") == 0) per_mail = TRUE; | |
8f240103 | 2197 | else key = string_sprintf("%s", ss); |
870f6ba8 | 2198 | } |
8f240103 | 2199 | |
870f6ba8 TF |
2200 | if (leaky + strict > 1 || per_byte + per_cmd + per_conn + per_mail > 1) |
2201 | { | |
2202 | *log_msgptr = US"conflicting options for \"ratelimit\" condition"; | |
2203 | return ERROR; | |
2204 | } | |
2205 | ||
2206 | /* Default option values */ | |
8f240103 | 2207 | |
870f6ba8 TF |
2208 | if (!strict) leaky = TRUE; |
2209 | if (!per_byte && !per_cmd && !per_conn) per_mail = TRUE; | |
2210 | ||
8f240103 PH |
2211 | /* Create the lookup key. If there is no explicit key, use sender_host_address. |
2212 | If there is no sender_host_address (e.g. -bs or acl_not_smtp) then we simply | |
2213 | omit it. The smoothing constant (sender_rate_period) and the per_xxx options | |
2214 | are added to the key because they alter the meaning of the stored data. */ | |
2215 | ||
2216 | if (key == NULL) | |
2217 | key = (sender_host_address == NULL)? US"" : sender_host_address; | |
870f6ba8 | 2218 | |
8f240103 PH |
2219 | key = string_sprintf("%s/%s/%s/%s", |
2220 | sender_rate_period, | |
2221 | per_byte? US"per_byte" : | |
2222 | per_cmd? US"per_cmd" : | |
2223 | per_mail? US"per_mail" : US"per_conn", | |
2224 | strict? US"strict" : US"leaky", | |
2225 | key); | |
870f6ba8 TF |
2226 | |
2227 | HDEBUG(D_acl) debug_printf("ratelimit condition limit=%.0f period=%.0f key=%s\n", | |
2228 | limit, period, key); | |
2229 | ||
8f240103 PH |
2230 | /* See if we have already computed the rate by looking in the relevant tree. |
2231 | For per-connection rate limiting, store tree nodes and dbdata in the permanent | |
2232 | pool so that they survive across resets. */ | |
870f6ba8 TF |
2233 | |
2234 | anchor = NULL; | |
2235 | old_pool = store_pool; | |
2236 | ||
2237 | if (per_conn) | |
2238 | { | |
2239 | anchor = &ratelimiters_conn; | |
2240 | store_pool = POOL_PERM; | |
2241 | } | |
fe0dab11 | 2242 | else if (per_mail || per_byte) |
870f6ba8 | 2243 | anchor = &ratelimiters_mail; |
fe0dab11 TF |
2244 | else if (per_cmd) |
2245 | anchor = &ratelimiters_cmd; | |
870f6ba8 TF |
2246 | |
2247 | if (anchor != NULL && (t = tree_search(*anchor, key)) != NULL) | |
2248 | { | |
2249 | dbd = t->data.ptr; | |
2250 | /* The following few lines duplicate some of the code below. */ | |
8f240103 | 2251 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2252 | store_pool = old_pool; |
2253 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2254 | HDEBUG(D_acl) | |
2255 | debug_printf("ratelimit found pre-computed rate %s\n", sender_rate); | |
2256 | return rc; | |
2257 | } | |
2258 | ||
2259 | /* We aren't using a pre-computed rate, so get a previously recorded | |
8f240103 PH |
2260 | rate from the database, update it, and write it back when required. If there's |
2261 | no previous rate for this key, create one. */ | |
870f6ba8 TF |
2262 | |
2263 | dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE); | |
2264 | if (dbm == NULL) | |
2265 | { | |
2266 | store_pool = old_pool; | |
2267 | sender_rate = NULL; | |
2268 | HDEBUG(D_acl) debug_printf("ratelimit database not available\n"); | |
2269 | *log_msgptr = US"ratelimit database not available"; | |
2270 | return DEFER; | |
2271 | } | |
2272 | dbd = dbfn_read(dbm, key); | |
2273 | ||
2274 | gettimeofday(&tv, NULL); | |
2275 | ||
2276 | if (dbd == NULL) | |
2277 | { | |
2278 | HDEBUG(D_acl) debug_printf("ratelimit initializing new key's data\n"); | |
2279 | dbd = store_get(sizeof(dbdata_ratelimit)); | |
2280 | dbd->time_stamp = tv.tv_sec; | |
2281 | dbd->time_usec = tv.tv_usec; | |
2282 | dbd->rate = 0.0; | |
2283 | } | |
2284 | else | |
2285 | { | |
2286 | /* The smoothed rate is computed using an exponentially weighted moving | |
2287 | average adjusted for variable sampling intervals. The standard EWMA for | |
2288 | a fixed sampling interval is: f'(t) = (1 - a) * f(t) + a * f'(t - 1) | |
2289 | where f() is the measured value and f'() is the smoothed value. | |
2290 | ||
2291 | Old data decays out of the smoothed value exponentially, such that data n | |
2292 | samples old is multiplied by a^n. The exponential decay time constant p | |
2293 | is defined such that data p samples old is multiplied by 1/e, which means | |
2294 | that a = exp(-1/p). We can maintain the same time constant for a variable | |
2295 | sampling interval i by using a = exp(-i/p). | |
2296 | ||
2297 | The rate we are measuring is messages per period, suitable for directly | |
2298 | comparing with the limit. The average rate between now and the previous | |
2299 | message is period / interval, which we feed into the EWMA as the sample. | |
2300 | ||
2301 | It turns out that the number of messages required for the smoothed rate | |
2302 | to reach the limit when they are sent in a burst is equal to the limit. | |
2303 | This can be seen by analysing the value of the smoothed rate after N | |
2304 | messages sent at even intervals. Let k = (1 - a) * p/i | |
2305 | ||
2306 | rate_1 = (1 - a) * p/i + a * rate_0 | |
2307 | = k + a * rate_0 | |
2308 | rate_2 = k + a * rate_1 | |
2309 | = k + a * k + a^2 * rate_0 | |
2310 | rate_3 = k + a * k + a^2 * k + a^3 * rate_0 | |
2311 | rate_N = rate_0 * a^N + k * SUM(x=0..N-1)(a^x) | |
2312 | = rate_0 * a^N + k * (1 - a^N) / (1 - a) | |
2313 | = rate_0 * a^N + p/i * (1 - a^N) | |
2314 | ||
2315 | When N is large, a^N -> 0 so rate_N -> p/i as desired. | |
2316 | ||
2317 | rate_N = p/i + (rate_0 - p/i) * a^N | |
2318 | a^N = (rate_N - p/i) / (rate_0 - p/i) | |
2319 | N * -i/p = log((rate_N - p/i) / (rate_0 - p/i)) | |
2320 | N = p/i * log((rate_0 - p/i) / (rate_N - p/i)) | |
2321 | ||
2322 | Numerical analysis of the above equation, setting the computed rate to | |
2323 | increase from rate_0 = 0 to rate_N = limit, shows that for large sending | |
2324 | rates, p/i, the number of messages N = limit. So limit serves as both the | |
2325 | maximum rate measured in messages per period, and the maximum number of | |
2326 | messages that can be sent in a fast burst. */ | |
2327 | ||
2328 | double this_time = (double)tv.tv_sec | |
2329 | + (double)tv.tv_usec / 1000000.0; | |
2330 | double prev_time = (double)dbd->time_stamp | |
2331 | + (double)dbd->time_usec / 1000000.0; | |
870f6ba8 TF |
2332 | |
2333 | /* We must avoid division by zero, and deal gracefully with the clock going | |
2334 | backwards. If we blunder ahead when time is in reverse then the computed | |
e5d5a95f | 2335 | rate will be bogus. To be safe we clamp interval to a very small number. */ |
870f6ba8 | 2336 | |
e5d5a95f TF |
2337 | double interval = this_time - prev_time <= 0.0 ? 1e-9 |
2338 | : this_time - prev_time; | |
2339 | ||
2340 | double i_over_p = interval / period; | |
2341 | double a = exp(-i_over_p); | |
870f6ba8 TF |
2342 | |
2343 | dbd->time_stamp = tv.tv_sec; | |
2344 | dbd->time_usec = tv.tv_usec; | |
2345 | ||
2346 | /* If we are measuring the rate in bytes per period, multiply the | |
2347 | measured rate by the message size. If we don't know the message size | |
2348 | then it's safe to just use a value of zero and let the recorded rate | |
2349 | decay as if nothing happened. */ | |
2350 | ||
2351 | if (per_byte) | |
2352 | dbd->rate = (message_size < 0 ? 0.0 : (double)message_size) | |
2353 | * (1 - a) / i_over_p + a * dbd->rate; | |
90fc3069 TF |
2354 | else if (per_cmd && where == ACL_WHERE_NOTSMTP) |
2355 | dbd->rate = (double)recipients_count | |
2356 | * (1 - a) / i_over_p + a * dbd->rate; | |
870f6ba8 TF |
2357 | else |
2358 | dbd->rate = (1 - a) / i_over_p + a * dbd->rate; | |
2359 | } | |
2360 | ||
3348576f TF |
2361 | /* Clients sending at the limit are considered to be over the limit. This |
2362 | matters for edge cases such the first message sent by a client (which gets | |
2363 | the initial rate of 0.0) when the rate limit is zero (i.e. the client should | |
2364 | be completely blocked). */ | |
2365 | ||
8f240103 | 2366 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2367 | |
2368 | /* Update the state if the rate is low or if we are being strict. If we | |
2369 | are in leaky mode and the sender's rate is too high, we do not update | |
2370 | the recorded rate in order to avoid an over-aggressive sender's retry | |
8f240103 PH |
2371 | rate preventing them from getting any email through. If noupdate is set, |
2372 | do not do any updates. */ | |
870f6ba8 | 2373 | |
8f240103 PH |
2374 | if ((rc == FAIL || !leaky) && !noupdate) |
2375 | { | |
870f6ba8 | 2376 | dbfn_write(dbm, key, dbd, sizeof(dbdata_ratelimit)); |
8f240103 PH |
2377 | HDEBUG(D_acl) debug_printf("ratelimit db updated\n"); |
2378 | } | |
2379 | else | |
2380 | { | |
2381 | HDEBUG(D_acl) debug_printf("ratelimit db not updated: %s\n", | |
2382 | noupdate? "noupdate set" : "over the limit, but leaky"); | |
2383 | } | |
2384 | ||
870f6ba8 TF |
2385 | dbfn_close(dbm); |
2386 | ||
2387 | /* Store the result in the tree for future reference, if necessary. */ | |
2388 | ||
8f240103 | 2389 | if (anchor != NULL && !noupdate) |
870f6ba8 TF |
2390 | { |
2391 | t = store_get(sizeof(tree_node) + Ustrlen(key)); | |
2392 | t->data.ptr = dbd; | |
2393 | Ustrcpy(t->name, key); | |
2394 | (void)tree_insertnode(anchor, t); | |
2395 | } | |
2396 | ||
2397 | /* We create the formatted version of the sender's rate very late in | |
2398 | order to ensure that it is done using the correct storage pool. */ | |
2399 | ||
2400 | store_pool = old_pool; | |
2401 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2402 | ||
2403 | HDEBUG(D_acl) | |
2404 | debug_printf("ratelimit computed rate %s\n", sender_rate); | |
2405 | ||
2406 | return rc; | |
2407 | } | |
2408 | ||
2409 | ||
2410 | ||
059ec3d9 PH |
2411 | /************************************************* |
2412 | * Handle conditions/modifiers on an ACL item * | |
2413 | *************************************************/ | |
2414 | ||
2415 | /* Called from acl_check() below. | |
2416 | ||
2417 | Arguments: | |
2418 | verb ACL verb | |
2419 | cb ACL condition block - if NULL, result is OK | |
2420 | where where called from | |
2421 | addr the address being checked for RCPT, or NULL | |
2422 | level the nesting level | |
2423 | epp pointer to pass back TRUE if "endpass" encountered | |
2424 | (applies only to "accept" and "discard") | |
2425 | user_msgptr user message pointer | |
2426 | log_msgptr log message pointer | |
2427 | basic_errno pointer to where to put verify error | |
2428 | ||
2429 | Returns: OK - all conditions are met | |
2430 | DISCARD - an "acl" condition returned DISCARD - only allowed | |
2431 | for "accept" or "discard" verbs | |
2432 | FAIL - at least one condition fails | |
2433 | FAIL_DROP - an "acl" condition returned FAIL_DROP | |
2434 | DEFER - can't tell at the moment (typically, lookup defer, | |
2435 | but can be temporary callout problem) | |
2436 | ERROR - ERROR from nested ACL or expansion failure or other | |
2437 | error | |
2438 | */ | |
2439 | ||
2440 | static int | |
2441 | acl_check_condition(int verb, acl_condition_block *cb, int where, | |
2442 | address_item *addr, int level, BOOL *epp, uschar **user_msgptr, | |
2443 | uschar **log_msgptr, int *basic_errno) | |
2444 | { | |
2445 | uschar *user_message = NULL; | |
2446 | uschar *log_message = NULL; | |
91ecef39 | 2447 | uschar *p = NULL; |
059ec3d9 | 2448 | int rc = OK; |
8523533c TK |
2449 | #ifdef WITH_CONTENT_SCAN |
2450 | int sep = '/'; | |
2451 | #endif | |
059ec3d9 PH |
2452 | |
2453 | for (; cb != NULL; cb = cb->next) | |
2454 | { | |
2455 | uschar *arg; | |
8e669ac1 | 2456 | int control_type; |
059ec3d9 PH |
2457 | |
2458 | /* The message and log_message items set up messages to be used in | |
2459 | case of rejection. They are expanded later. */ | |
2460 | ||
2461 | if (cb->type == ACLC_MESSAGE) | |
2462 | { | |
2463 | user_message = cb->arg; | |
2464 | continue; | |
2465 | } | |
2466 | ||
2467 | if (cb->type == ACLC_LOG_MESSAGE) | |
2468 | { | |
2469 | log_message = cb->arg; | |
2470 | continue; | |
2471 | } | |
2472 | ||
2473 | /* The endpass "condition" just sets a flag to show it occurred. This is | |
2474 | checked at compile time to be on an "accept" or "discard" item. */ | |
2475 | ||
2476 | if (cb->type == ACLC_ENDPASS) | |
2477 | { | |
2478 | *epp = TRUE; | |
2479 | continue; | |
2480 | } | |
2481 | ||
2482 | /* For other conditions and modifiers, the argument is expanded now for some | |
2483 | of them, but not for all, because expansion happens down in some lower level | |
2484 | checking functions in some cases. */ | |
2485 | ||
2486 | if (cond_expand_at_top[cb->type]) | |
2487 | { | |
2488 | arg = expand_string(cb->arg); | |
2489 | if (arg == NULL) | |
2490 | { | |
2491 | if (expand_string_forcedfail) continue; | |
2492 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
2493 | cb->arg, expand_string_message); | |
2494 | return search_find_defer? DEFER : ERROR; | |
2495 | } | |
2496 | } | |
2497 | else arg = cb->arg; | |
2498 | ||
2499 | /* Show condition, and expanded condition if it's different */ | |
2500 | ||
2501 | HDEBUG(D_acl) | |
2502 | { | |
2503 | int lhswidth = 0; | |
2504 | debug_printf("check %s%s %n", | |
2505 | (!cond_modifiers[cb->type] && cb->u.negated)? "!":"", | |
2506 | conditions[cb->type], &lhswidth); | |
2507 | ||
2508 | if (cb->type == ACLC_SET) | |
2509 | { | |
38a0a95f PH |
2510 | debug_printf("acl_%s ", cb->u.varname); |
2511 | lhswidth += 5 + Ustrlen(cb->u.varname); | |
059ec3d9 PH |
2512 | } |
2513 | ||
2514 | debug_printf("= %s\n", cb->arg); | |
2515 | ||
2516 | if (arg != cb->arg) | |
2517 | debug_printf("%.*s= %s\n", lhswidth, | |
2518 | US" ", CS arg); | |
2519 | } | |
2520 | ||
2521 | /* Check that this condition makes sense at this time */ | |
2522 | ||
2523 | if ((cond_forbids[cb->type] & (1 << where)) != 0) | |
2524 | { | |
2525 | *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL", | |
2526 | cond_modifiers[cb->type]? "use" : "test", | |
2527 | conditions[cb->type], acl_wherenames[where]); | |
2528 | return ERROR; | |
2529 | } | |
2530 | ||
2531 | /* Run the appropriate test for each condition, or take the appropriate | |
2532 | action for the remaining modifiers. */ | |
2533 | ||
2534 | switch(cb->type) | |
2535 | { | |
71fafd95 PH |
2536 | case ACLC_ADD_HEADER: |
2537 | setup_header(arg); | |
2538 | break; | |
2539 | ||
059ec3d9 PH |
2540 | /* A nested ACL that returns "discard" makes sense only for an "accept" or |
2541 | "discard" verb. */ | |
71fafd95 | 2542 | |
059ec3d9 PH |
2543 | case ACLC_ACL: |
2544 | rc = acl_check_internal(where, addr, arg, level+1, user_msgptr, log_msgptr); | |
2545 | if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD) | |
2546 | { | |
2547 | *log_msgptr = string_sprintf("nested ACL returned \"discard\" for " | |
2548 | "\"%s\" command (only allowed with \"accept\" or \"discard\")", | |
2549 | verbs[verb]); | |
2550 | return ERROR; | |
2551 | } | |
2552 | break; | |
2553 | ||
2554 | case ACLC_AUTHENTICATED: | |
2555 | rc = (sender_host_authenticated == NULL)? FAIL : | |
2556 | match_isinlist(sender_host_authenticated, &arg, 0, NULL, NULL, MCL_STRING, | |
2557 | TRUE, NULL); | |
2558 | break; | |
2559 | ||
71fafd95 | 2560 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
8523533c TK |
2561 | case ACLC_BMI_OPTIN: |
2562 | { | |
2563 | int old_pool = store_pool; | |
2564 | store_pool = POOL_PERM; | |
2565 | bmi_current_optin = string_copy(arg); | |
2566 | store_pool = old_pool; | |
2567 | } | |
2568 | break; | |
71fafd95 | 2569 | #endif |
8523533c | 2570 | |
059ec3d9 PH |
2571 | case ACLC_CONDITION: |
2572 | if (Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */ | |
2573 | rc = (Uatoi(arg) == 0)? FAIL : OK; | |
2574 | else | |
2575 | rc = (strcmpic(arg, US"no") == 0 || | |
2576 | strcmpic(arg, US"false") == 0)? FAIL : | |
2577 | (strcmpic(arg, US"yes") == 0 || | |
2578 | strcmpic(arg, US"true") == 0)? OK : DEFER; | |
2579 | if (rc == DEFER) | |
2580 | *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg); | |
2581 | break; | |
2582 | ||
c3611384 PH |
2583 | case ACLC_CONTINUE: /* Always succeeds */ |
2584 | break; | |
2585 | ||
059ec3d9 | 2586 | case ACLC_CONTROL: |
c5fcb476 PH |
2587 | control_type = decode_control(arg, &p, where, log_msgptr); |
2588 | ||
8523533c | 2589 | /* Check if this control makes sense at this time */ |
c5fcb476 PH |
2590 | |
2591 | if ((control_forbids[control_type] & (1 << where)) != 0) | |
2592 | { | |
2593 | *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL", | |
2594 | controls[control_type], acl_wherenames[where]); | |
2595 | return ERROR; | |
8e669ac1 | 2596 | } |
c5fcb476 PH |
2597 | |
2598 | switch(control_type) | |
059ec3d9 | 2599 | { |
c46782ef PH |
2600 | case CONTROL_AUTH_UNADVERTISED: |
2601 | allow_auth_unadvertised = TRUE; | |
2602 | break; | |
2603 | ||
2604 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
8523533c TK |
2605 | case CONTROL_BMI_RUN: |
2606 | bmi_run = 1; | |
2607 | break; | |
c46782ef PH |
2608 | #endif |
2609 | ||
2610 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
fb2274d4 TK |
2611 | case CONTROL_DK_VERIFY: |
2612 | dk_do_verify = 1; | |
2613 | break; | |
c46782ef PH |
2614 | #endif |
2615 | ||
059ec3d9 PH |
2616 | case CONTROL_ERROR: |
2617 | return ERROR; | |
2618 | ||
2619 | case CONTROL_CASEFUL_LOCAL_PART: | |
2620 | deliver_localpart = addr->cc_local_part; | |
2621 | break; | |
2622 | ||
2623 | case CONTROL_CASELOWER_LOCAL_PART: | |
2624 | deliver_localpart = addr->lc_local_part; | |
2625 | break; | |
2626 | ||
2627 | case CONTROL_ENFORCE_SYNC: | |
2628 | smtp_enforce_sync = TRUE; | |
2629 | break; | |
2630 | ||
2631 | case CONTROL_NO_ENFORCE_SYNC: | |
2632 | smtp_enforce_sync = FALSE; | |
2633 | break; | |
2634 | ||
c46782ef | 2635 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
2636 | case CONTROL_NO_MBOX_UNSPOOL: |
2637 | no_mbox_unspool = TRUE; | |
2638 | break; | |
c46782ef | 2639 | #endif |
8523533c | 2640 | |
059ec3d9 PH |
2641 | case CONTROL_NO_MULTILINE: |
2642 | no_multiline_responses = TRUE; | |
2643 | break; | |
2644 | ||
cf8b11a5 PH |
2645 | case CONTROL_NO_PIPELINING: |
2646 | pipelining_enable = FALSE; | |
2647 | break; | |
2648 | ||
047bdd8c PH |
2649 | case CONTROL_NO_DELAY_FLUSH: |
2650 | disable_delay_flush = TRUE; | |
2651 | break; | |
2652 | ||
4c590bd1 PH |
2653 | case CONTROL_NO_CALLOUT_FLUSH: |
2654 | disable_callout_flush = TRUE; | |
2655 | break; | |
2656 | ||
29aba418 | 2657 | case CONTROL_FAKEDEFER: |
8523533c | 2658 | case CONTROL_FAKEREJECT: |
29aba418 | 2659 | fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL; |
8523533c | 2660 | if (*p == '/') |
8e669ac1 | 2661 | { |
8523533c | 2662 | uschar *pp = p + 1; |
8e669ac1 | 2663 | while (*pp != 0) pp++; |
29aba418 | 2664 | fake_response_text = expand_string(string_copyn(p+1, pp-p-1)); |
8523533c TK |
2665 | p = pp; |
2666 | } | |
2667 | else | |
2668 | { | |
2669 | /* Explicitly reset to default string */ | |
29aba418 | 2670 | 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 |
2671 | } |
2672 | break; | |
8523533c | 2673 | |
059ec3d9 PH |
2674 | case CONTROL_FREEZE: |
2675 | deliver_freeze = TRUE; | |
2676 | deliver_frozen_at = time(NULL); | |
6a3f1455 PH |
2677 | freeze_tell = freeze_tell_config; /* Reset to configured value */ |
2678 | if (Ustrncmp(p, "/no_tell", 8) == 0) | |
2679 | { | |
2680 | p += 8; | |
2681 | freeze_tell = NULL; | |
2682 | } | |
2683 | if (*p != 0) | |
2684 | { | |
2685 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2686 | return ERROR; | |
2687 | } | |
059ec3d9 PH |
2688 | break; |
2689 | ||
2690 | case CONTROL_QUEUE_ONLY: | |
2691 | queue_only_policy = TRUE; | |
2692 | break; | |
2693 | ||
2694 | case CONTROL_SUBMISSION: | |
87ba3f5f | 2695 | originator_name = US""; |
059ec3d9 | 2696 | submission_mode = TRUE; |
69358f02 | 2697 | while (*p == '/') |
8e669ac1 | 2698 | { |
69358f02 PH |
2699 | if (Ustrncmp(p, "/sender_retain", 14) == 0) |
2700 | { | |
2701 | p += 14; | |
2702 | active_local_sender_retain = TRUE; | |
8e669ac1 PH |
2703 | active_local_from_check = FALSE; |
2704 | } | |
69358f02 PH |
2705 | else if (Ustrncmp(p, "/domain=", 8) == 0) |
2706 | { | |
2707 | uschar *pp = p + 8; | |
8e669ac1 | 2708 | while (*pp != 0 && *pp != '/') pp++; |
87ba3f5f PH |
2709 | submission_domain = string_copyn(p+8, pp-p-8); |
2710 | p = pp; | |
2711 | } | |
8857ccfd PH |
2712 | /* The name= option must be last, because it swallows the rest of |
2713 | the string. */ | |
87ba3f5f PH |
2714 | else if (Ustrncmp(p, "/name=", 6) == 0) |
2715 | { | |
2716 | uschar *pp = p + 6; | |
8857ccfd | 2717 | while (*pp != 0) pp++; |
2fe1a124 | 2718 | submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6, |
87ba3f5f | 2719 | big_buffer, big_buffer_size)); |
8e669ac1 | 2720 | p = pp; |
69358f02 | 2721 | } |
8e669ac1 PH |
2722 | else break; |
2723 | } | |
69358f02 | 2724 | if (*p != 0) |
059ec3d9 | 2725 | { |
69358f02 | 2726 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); |
059ec3d9 PH |
2727 | return ERROR; |
2728 | } | |
2729 | break; | |
8800895a PH |
2730 | |
2731 | case CONTROL_SUPPRESS_LOCAL_FIXUPS: | |
2732 | suppress_local_fixups = TRUE; | |
2733 | break; | |
059ec3d9 PH |
2734 | } |
2735 | break; | |
2736 | ||
71fafd95 | 2737 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
2738 | case ACLC_DECODE: |
2739 | rc = mime_decode(&arg); | |
2740 | break; | |
71fafd95 | 2741 | #endif |
8523533c | 2742 | |
059ec3d9 PH |
2743 | case ACLC_DELAY: |
2744 | { | |
2745 | int delay = readconf_readtime(arg, 0, FALSE); | |
2746 | if (delay < 0) | |
2747 | { | |
2748 | *log_msgptr = string_sprintf("syntax error in argument for \"delay\" " | |
2749 | "modifier: \"%s\" is not a time value", arg); | |
2750 | return ERROR; | |
2751 | } | |
2752 | else | |
2753 | { | |
2754 | HDEBUG(D_acl) debug_printf("delay modifier requests %d-second delay\n", | |
2755 | delay); | |
2756 | if (host_checking) | |
2757 | { | |
2758 | HDEBUG(D_acl) | |
2759 | debug_printf("delay skipped in -bh checking mode\n"); | |
2760 | } | |
010c2d14 PH |
2761 | |
2762 | /* It appears to be impossible to detect that a TCP/IP connection has | |
2763 | gone away without reading from it. This means that we cannot shorten | |
2764 | the delay below if the client goes away, because we cannot discover | |
2765 | that the client has closed its end of the connection. (The connection | |
2766 | is actually in a half-closed state, waiting for the server to close its | |
2767 | end.) It would be nice to be able to detect this state, so that the | |
2768 | Exim process is not held up unnecessarily. However, it seems that we | |
2769 | can't. The poll() function does not do the right thing, and in any case | |
2770 | it is not always available. | |
2771 | ||
047bdd8c | 2772 | NOTE 1: If ever this state of affairs changes, remember that we may be |
010c2d14 | 2773 | dealing with stdin/stdout here, in addition to TCP/IP connections. |
047bdd8c PH |
2774 | Also, delays may be specified for non-SMTP input, where smtp_out and |
2775 | smtp_in will be NULL. Whatever is done must work in all cases. | |
2776 | ||
2777 | NOTE 2: The added feature of flushing the output before a delay must | |
2778 | apply only to SMTP input. Hence the test for smtp_out being non-NULL. | |
2779 | */ | |
010c2d14 | 2780 | |
8e669ac1 | 2781 | else |
86b8287f | 2782 | { |
14f4a80d | 2783 | if (smtp_out != NULL && !disable_delay_flush) mac_smtp_fflush(); |
86b8287f | 2784 | while (delay > 0) delay = sleep(delay); |
8e669ac1 | 2785 | } |
059ec3d9 PH |
2786 | } |
2787 | } | |
2788 | break; | |
2789 | ||
71fafd95 | 2790 | #ifdef WITH_OLD_DEMIME |
8523533c TK |
2791 | case ACLC_DEMIME: |
2792 | rc = demime(&arg); | |
2793 | break; | |
71fafd95 | 2794 | #endif |
8523533c | 2795 | |
71fafd95 PH |
2796 | #ifdef EXPERIMENTAL_DOMAINKEYS |
2797 | case ACLC_DK_DOMAIN_SOURCE: | |
fb2274d4 TK |
2798 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2799 | /* check header source of domain against given string */ | |
2800 | switch (dk_verify_block->address_source) { | |
2801 | case DK_EXIM_ADDRESS_FROM_FROM: | |
2802 | rc = match_isinlist(US"from", &arg, 0, NULL, | |
2803 | NULL, MCL_STRING, TRUE, NULL); | |
2804 | break; | |
2805 | case DK_EXIM_ADDRESS_FROM_SENDER: | |
2806 | rc = match_isinlist(US"sender", &arg, 0, NULL, | |
2807 | NULL, MCL_STRING, TRUE, NULL); | |
2808 | break; | |
2809 | case DK_EXIM_ADDRESS_NONE: | |
2810 | rc = match_isinlist(US"none", &arg, 0, NULL, | |
2811 | NULL, MCL_STRING, TRUE, NULL); | |
2812 | break; | |
71fafd95 PH |
2813 | } |
2814 | break; | |
2815 | ||
2816 | case ACLC_DK_POLICY: | |
fb2274d4 TK |
2817 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2818 | /* check policy against given string, default FAIL */ | |
2819 | rc = FAIL; | |
2820 | if (dk_verify_block->signsall) | |
2821 | rc = match_isinlist(US"signsall", &arg, 0, NULL, | |
2822 | NULL, MCL_STRING, TRUE, NULL); | |
2823 | if (dk_verify_block->testing) | |
2824 | rc = match_isinlist(US"testing", &arg, 0, NULL, | |
2825 | NULL, MCL_STRING, TRUE, NULL); | |
71fafd95 PH |
2826 | break; |
2827 | ||
2828 | case ACLC_DK_SENDER_DOMAINS: | |
fb2274d4 TK |
2829 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2830 | if (dk_verify_block->domain != NULL) | |
2831 | rc = match_isinlist(dk_verify_block->domain, &arg, 0, &domainlist_anchor, | |
2832 | NULL, MCL_DOMAIN, TRUE, NULL); | |
2833 | else rc = FAIL; | |
71fafd95 PH |
2834 | break; |
2835 | ||
2836 | case ACLC_DK_SENDER_LOCAL_PARTS: | |
fb2274d4 TK |
2837 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2838 | if (dk_verify_block->local_part != NULL) | |
2839 | rc = match_isinlist(dk_verify_block->local_part, &arg, 0, &localpartlist_anchor, | |
2840 | NULL, MCL_LOCALPART, TRUE, NULL); | |
2841 | else rc = FAIL; | |
71fafd95 PH |
2842 | break; |
2843 | ||
2844 | case ACLC_DK_SENDERS: | |
fb2274d4 TK |
2845 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2846 | if (dk_verify_block->address != NULL) | |
2847 | rc = match_address_list(dk_verify_block->address, TRUE, TRUE, &arg, NULL, -1, 0, NULL); | |
2848 | else rc = FAIL; | |
71fafd95 PH |
2849 | break; |
2850 | ||
2851 | case ACLC_DK_STATUS: | |
fb2274d4 TK |
2852 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2853 | if (dk_verify_block->result > 0) { | |
2854 | switch(dk_verify_block->result) { | |
2855 | case DK_EXIM_RESULT_BAD_FORMAT: | |
2856 | rc = match_isinlist(US"bad format", &arg, 0, NULL, | |
2857 | NULL, MCL_STRING, TRUE, NULL); | |
2858 | break; | |
2859 | case DK_EXIM_RESULT_NO_KEY: | |
2860 | rc = match_isinlist(US"no key", &arg, 0, NULL, | |
2861 | NULL, MCL_STRING, TRUE, NULL); | |
2862 | break; | |
2863 | case DK_EXIM_RESULT_NO_SIGNATURE: | |
2864 | rc = match_isinlist(US"no signature", &arg, 0, NULL, | |
2865 | NULL, MCL_STRING, TRUE, NULL); | |
2866 | break; | |
2867 | case DK_EXIM_RESULT_REVOKED: | |
2868 | rc = match_isinlist(US"revoked", &arg, 0, NULL, | |
2869 | NULL, MCL_STRING, TRUE, NULL); | |
2870 | break; | |
2871 | case DK_EXIM_RESULT_NON_PARTICIPANT: | |
2872 | rc = match_isinlist(US"non-participant", &arg, 0, NULL, | |
2873 | NULL, MCL_STRING, TRUE, NULL); | |
2874 | break; | |
2875 | case DK_EXIM_RESULT_GOOD: | |
2876 | rc = match_isinlist(US"good", &arg, 0, NULL, | |
2877 | NULL, MCL_STRING, TRUE, NULL); | |
2878 | break; | |
2879 | case DK_EXIM_RESULT_BAD: | |
2880 | rc = match_isinlist(US"bad", &arg, 0, NULL, | |
2881 | NULL, MCL_STRING, TRUE, NULL); | |
2882 | break; | |
71fafd95 | 2883 | } |
fb2274d4 | 2884 | } |
71fafd95 PH |
2885 | break; |
2886 | #endif | |
fb2274d4 | 2887 | |
059ec3d9 PH |
2888 | case ACLC_DNSLISTS: |
2889 | rc = verify_check_dnsbl(&arg); | |
2890 | break; | |
2891 | ||
2892 | case ACLC_DOMAINS: | |
2893 | rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor, | |
2894 | addr->domain_cache, MCL_DOMAIN, TRUE, &deliver_domain_data); | |
2895 | break; | |
2896 | ||
2897 | /* The value in tls_cipher is the full cipher name, for example, | |
2898 | TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the | |
2899 | cipher names such as DES-CBC3-SHA. But program defensively. We don't know | |
2900 | what may in practice come out of the SSL library - which at the time of | |
2901 | writing is poorly documented. */ | |
2902 | ||
2903 | case ACLC_ENCRYPTED: | |
2904 | if (tls_cipher == NULL) rc = FAIL; else | |
2905 | { | |
2906 | uschar *endcipher = NULL; | |
2907 | uschar *cipher = Ustrchr(tls_cipher, ':'); | |
2908 | if (cipher == NULL) cipher = tls_cipher; else | |
2909 | { | |
2910 | endcipher = Ustrchr(++cipher, ':'); | |
2911 | if (endcipher != NULL) *endcipher = 0; | |
2912 | } | |
2913 | rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL); | |
2914 | if (endcipher != NULL) *endcipher = ':'; | |
2915 | } | |
2916 | break; | |
2917 | ||
2918 | /* Use verify_check_this_host() instead of verify_check_host() so that | |
2919 | we can pass over &host_data to catch any looked up data. Once it has been | |
2920 | set, it retains its value so that it's still there if another ACL verb | |
2921 | comes through here and uses the cache. However, we must put it into | |
2922 | permanent store in case it is also expected to be used in a subsequent | |
2923 | message in the same SMTP connection. */ | |
2924 | ||
2925 | case ACLC_HOSTS: | |
2926 | rc = verify_check_this_host(&arg, sender_host_cache, NULL, | |
2927 | (sender_host_address == NULL)? US"" : sender_host_address, &host_data); | |
2928 | if (host_data != NULL) host_data = string_copy_malloc(host_data); | |
2929 | break; | |
2930 | ||
2931 | case ACLC_LOCAL_PARTS: | |
2932 | rc = match_isinlist(addr->cc_local_part, &arg, 0, | |
2933 | &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE, | |
2934 | &deliver_localpart_data); | |
2935 | break; | |
2936 | ||
6ea85e9a PH |
2937 | case ACLC_LOG_REJECT_TARGET: |
2938 | { | |
2939 | int logbits = 0; | |
2940 | int sep = 0; | |
2941 | uschar *s = arg; | |
2942 | uschar *ss; | |
2943 | while ((ss = string_nextinlist(&s, &sep, big_buffer, big_buffer_size)) | |
2944 | != NULL) | |
2945 | { | |
2946 | if (Ustrcmp(ss, "main") == 0) logbits |= LOG_MAIN; | |
2947 | else if (Ustrcmp(ss, "panic") == 0) logbits |= LOG_PANIC; | |
2948 | else if (Ustrcmp(ss, "reject") == 0) logbits |= LOG_REJECT; | |
2949 | else | |
2950 | { | |
2951 | logbits |= LOG_MAIN|LOG_REJECT; | |
2952 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown log name \"%s\" in " | |
2953 | "\"log_reject_target\" in %s ACL", ss, acl_wherenames[where]); | |
2954 | } | |
2955 | } | |
2956 | log_reject_target = logbits; | |
2957 | } | |
2958 | break; | |
2959 | ||
059ec3d9 PH |
2960 | case ACLC_LOGWRITE: |
2961 | { | |
2962 | int logbits = 0; | |
2963 | uschar *s = arg; | |
2964 | if (*s == ':') | |
2965 | { | |
2966 | s++; | |
2967 | while (*s != ':') | |
2968 | { | |
2969 | if (Ustrncmp(s, "main", 4) == 0) | |
2970 | { logbits |= LOG_MAIN; s += 4; } | |
2971 | else if (Ustrncmp(s, "panic", 5) == 0) | |
2972 | { logbits |= LOG_PANIC; s += 5; } | |
2973 | else if (Ustrncmp(s, "reject", 6) == 0) | |
2974 | { logbits |= LOG_REJECT; s += 6; } | |
2975 | else | |
2976 | { | |
2977 | logbits = LOG_MAIN|LOG_PANIC; | |
2978 | s = string_sprintf(":unknown log name in \"%s\" in " | |
2979 | "\"logwrite\" in %s ACL", arg, acl_wherenames[where]); | |
2980 | } | |
2981 | if (*s == ',') s++; | |
2982 | } | |
2983 | s++; | |
2984 | } | |
2985 | while (isspace(*s)) s++; | |
6ea85e9a PH |
2986 | |
2987 | ||
059ec3d9 PH |
2988 | if (logbits == 0) logbits = LOG_MAIN; |
2989 | log_write(0, logbits, "%s", string_printing(s)); | |
2990 | } | |
2991 | break; | |
8e669ac1 | 2992 | |
71fafd95 | 2993 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
2994 | case ACLC_MALWARE: |
2995 | { | |
6ea85e9a | 2996 | /* Separate the regular expression and any optional parameters. */ |
8523533c TK |
2997 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); |
2998 | /* Run the malware backend. */ | |
2999 | rc = malware(&ss); | |
3000 | /* Modify return code based upon the existance of options. */ | |
3001 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
3002 | != NULL) { | |
3003 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
3004 | { | |
3005 | /* FAIL so that the message is passed to the next ACL */ | |
3006 | rc = FAIL; | |
3007 | } | |
3008 | } | |
3009 | } | |
3010 | break; | |
3011 | ||
3012 | case ACLC_MIME_REGEX: | |
71fafd95 | 3013 | rc = mime_regex(&arg); |
8523533c | 3014 | break; |
71fafd95 | 3015 | #endif |
059ec3d9 | 3016 | |
870f6ba8 | 3017 | case ACLC_RATELIMIT: |
90fc3069 | 3018 | rc = acl_ratelimit(arg, where, log_msgptr); |
870f6ba8 TF |
3019 | break; |
3020 | ||
059ec3d9 PH |
3021 | case ACLC_RECIPIENTS: |
3022 | rc = match_address_list(addr->address, TRUE, TRUE, &arg, NULL, -1, 0, | |
3023 | &recipient_data); | |
3024 | break; | |
3025 | ||
71fafd95 PH |
3026 | #ifdef WITH_CONTENT_SCAN |
3027 | case ACLC_REGEX: | |
3028 | rc = regex(&arg); | |
8523533c | 3029 | break; |
71fafd95 | 3030 | #endif |
8523533c | 3031 | |
059ec3d9 PH |
3032 | case ACLC_SENDER_DOMAINS: |
3033 | { | |
3034 | uschar *sdomain; | |
3035 | sdomain = Ustrrchr(sender_address, '@'); | |
3036 | sdomain = (sdomain == NULL)? US"" : sdomain + 1; | |
3037 | rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor, | |
3038 | sender_domain_cache, MCL_DOMAIN, TRUE, NULL); | |
3039 | } | |
3040 | break; | |
3041 | ||
3042 | case ACLC_SENDERS: | |
3043 | rc = match_address_list(sender_address, TRUE, TRUE, &arg, | |
3044 | sender_address_cache, -1, 0, &sender_data); | |
3045 | break; | |
3046 | ||
3047 | /* Connection variables must persist forever */ | |
3048 | ||
3049 | case ACLC_SET: | |
3050 | { | |
3051 | int old_pool = store_pool; | |
38a0a95f PH |
3052 | if (cb->u.varname[0] == 'c') store_pool = POOL_PERM; |
3053 | acl_var_create(cb->u.varname)->data.ptr = string_copy(arg); | |
059ec3d9 PH |
3054 | store_pool = old_pool; |
3055 | } | |
3056 | break; | |
3057 | ||
71fafd95 | 3058 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3059 | case ACLC_SPAM: |
3060 | { | |
3061 | /* Seperate the regular expression and any optional parameters. */ | |
3062 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); | |
3063 | /* Run the spam backend. */ | |
3064 | rc = spam(&ss); | |
3065 | /* Modify return code based upon the existance of options. */ | |
3066 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
3067 | != NULL) { | |
3068 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
3069 | { | |
3070 | /* FAIL so that the message is passed to the next ACL */ | |
3071 | rc = FAIL; | |
3072 | } | |
3073 | } | |
3074 | } | |
3075 | break; | |
71fafd95 | 3076 | #endif |
8523533c | 3077 | |
71fafd95 | 3078 | #ifdef EXPERIMENTAL_SPF |
8523533c TK |
3079 | case ACLC_SPF: |
3080 | rc = spf_process(&arg, sender_address); | |
3081 | break; | |
71fafd95 | 3082 | #endif |
8523533c | 3083 | |
059ec3d9 PH |
3084 | /* If the verb is WARN, discard any user message from verification, because |
3085 | such messages are SMTP responses, not header additions. The latter come | |
475fe28a PH |
3086 | only from explicit "message" modifiers. However, put the user message into |
3087 | $acl_verify_message so it can be used in subsequent conditions or modifiers | |
3088 | (until something changes it). */ | |
059ec3d9 PH |
3089 | |
3090 | case ACLC_VERIFY: | |
3091 | rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno); | |
475fe28a | 3092 | acl_verify_message = *user_msgptr; |
059ec3d9 PH |
3093 | if (verb == ACL_WARN) *user_msgptr = NULL; |
3094 | break; | |
3095 | ||
3096 | default: | |
3097 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown " | |
3098 | "condition %d", cb->type); | |
3099 | break; | |
3100 | } | |
3101 | ||
3102 | /* If a condition was negated, invert OK/FAIL. */ | |
3103 | ||
3104 | if (!cond_modifiers[cb->type] && cb->u.negated) | |
3105 | { | |
3106 | if (rc == OK) rc = FAIL; | |
3107 | else if (rc == FAIL || rc == FAIL_DROP) rc = OK; | |
3108 | } | |
3109 | ||
3110 | if (rc != OK) break; /* Conditions loop */ | |
3111 | } | |
3112 | ||
3113 | ||
3114 | /* If the result is the one for which "message" and/or "log_message" are used, | |
4e88a19f PH |
3115 | handle the values of these modifiers. If there isn't a log message set, we make |
3116 | it the same as the user message. | |
059ec3d9 PH |
3117 | |
3118 | "message" is a user message that will be included in an SMTP response. Unless | |
3119 | it is empty, it overrides any previously set user message. | |
3120 | ||
3121 | "log_message" is a non-user message, and it adds to any existing non-user | |
3122 | message that is already set. | |
3123 | ||
4e88a19f PH |
3124 | Most verbs have but a single return for which the messages are relevant, but |
3125 | for "discard", it's useful to have the log message both when it succeeds and | |
3126 | when it fails. For "accept", the message is used in the OK case if there is no | |
3127 | "endpass", but (for backwards compatibility) in the FAIL case if "endpass" is | |
3128 | present. */ | |
059ec3d9 | 3129 | |
4e88a19f PH |
3130 | if (*epp && rc == OK) user_message = NULL; |
3131 | ||
3132 | if (((1<<rc) & msgcond[verb]) != 0) | |
059ec3d9 PH |
3133 | { |
3134 | uschar *expmessage; | |
4e88a19f PH |
3135 | uschar *old_user_msgptr = *user_msgptr; |
3136 | uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr; | |
059ec3d9 PH |
3137 | |
3138 | /* If the verb is "warn", messages generated by conditions (verification or | |
4e88a19f PH |
3139 | nested ACLs) are always discarded. This also happens for acceptance verbs |
3140 | when they actually do accept. Only messages specified at this level are used. | |
059ec3d9 PH |
3141 | However, the value of an existing message is available in $acl_verify_message |
3142 | during expansions. */ | |
3143 | ||
4e88a19f PH |
3144 | if (verb == ACL_WARN || |
3145 | (rc == OK && (verb == ACL_ACCEPT || verb == ACL_DISCARD))) | |
3146 | *log_msgptr = *user_msgptr = NULL; | |
059ec3d9 PH |
3147 | |
3148 | if (user_message != NULL) | |
3149 | { | |
3150 | acl_verify_message = old_user_msgptr; | |
3151 | expmessage = expand_string(user_message); | |
3152 | if (expmessage == NULL) | |
3153 | { | |
3154 | if (!expand_string_forcedfail) | |
3155 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3156 | user_message, expand_string_message); | |
3157 | } | |
3158 | else if (expmessage[0] != 0) *user_msgptr = expmessage; | |
3159 | } | |
3160 | ||
3161 | if (log_message != NULL) | |
3162 | { | |
3163 | acl_verify_message = old_log_msgptr; | |
3164 | expmessage = expand_string(log_message); | |
3165 | if (expmessage == NULL) | |
3166 | { | |
3167 | if (!expand_string_forcedfail) | |
3168 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3169 | log_message, expand_string_message); | |
3170 | } | |
3171 | else if (expmessage[0] != 0) | |
3172 | { | |
3173 | *log_msgptr = (*log_msgptr == NULL)? expmessage : | |
3174 | string_sprintf("%s: %s", expmessage, *log_msgptr); | |
3175 | } | |
3176 | } | |
3177 | ||
3178 | /* If no log message, default it to the user message */ | |
3179 | ||
3180 | if (*log_msgptr == NULL) *log_msgptr = *user_msgptr; | |
3181 | } | |
3182 | ||
3183 | acl_verify_message = NULL; | |
3184 | return rc; | |
3185 | } | |
3186 | ||
3187 | ||
3188 | ||
3189 | ||
3190 | ||
3191 | /************************************************* | |
3192 | * Get line from a literal ACL * | |
3193 | *************************************************/ | |
3194 | ||
3195 | /* This function is passed to acl_read() in order to extract individual lines | |
3196 | of a literal ACL, which we access via static pointers. We can destroy the | |
3197 | contents because this is called only once (the compiled ACL is remembered). | |
3198 | ||
3199 | This code is intended to treat the data in the same way as lines in the main | |
3200 | Exim configuration file. That is: | |
3201 | ||
3202 | . Leading spaces are ignored. | |
3203 | ||
3204 | . A \ at the end of a line is a continuation - trailing spaces after the \ | |
3205 | are permitted (this is because I don't believe in making invisible things | |
3206 | significant). Leading spaces on the continued part of a line are ignored. | |
3207 | ||
3208 | . Physical lines starting (significantly) with # are totally ignored, and | |
3209 | may appear within a sequence of backslash-continued lines. | |
3210 | ||
3211 | . Blank lines are ignored, but will end a sequence of continuations. | |
3212 | ||
3213 | Arguments: none | |
3214 | Returns: a pointer to the next line | |
3215 | */ | |
3216 | ||
3217 | ||
3218 | static uschar *acl_text; /* Current pointer in the text */ | |
3219 | static uschar *acl_text_end; /* Points one past the terminating '0' */ | |
3220 | ||
3221 | ||
3222 | static uschar * | |
3223 | acl_getline(void) | |
3224 | { | |
3225 | uschar *yield; | |
3226 | ||
3227 | /* This loop handles leading blank lines and comments. */ | |
3228 | ||
3229 | for(;;) | |
3230 | { | |
3231 | while (isspace(*acl_text)) acl_text++; /* Leading spaces/empty lines */ | |
3232 | if (*acl_text == 0) return NULL; /* No more data */ | |
3233 | yield = acl_text; /* Potential data line */ | |
3234 | ||
3235 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3236 | ||
3237 | /* If we hit the end before a newline, we have the whole logical line. If | |
3238 | it's a comment, there's no more data to be given. Otherwise, yield it. */ | |
3239 | ||
3240 | if (*acl_text == 0) return (*yield == '#')? NULL : yield; | |
3241 | ||
3242 | /* After reaching a newline, end this loop if the physical line does not | |
3243 | start with '#'. If it does, it's a comment, and the loop continues. */ | |
3244 | ||
3245 | if (*yield != '#') break; | |
3246 | } | |
3247 | ||
3248 | /* This loop handles continuations. We know we have some real data, ending in | |
3249 | newline. See if there is a continuation marker at the end (ignoring trailing | |
3250 | white space). We know that *yield is not white space, so no need to test for | |
3251 | cont > yield in the backwards scanning loop. */ | |
3252 | ||
3253 | for(;;) | |
3254 | { | |
3255 | uschar *cont; | |
3256 | for (cont = acl_text - 1; isspace(*cont); cont--); | |
3257 | ||
3258 | /* If no continuation follows, we are done. Mark the end of the line and | |
3259 | return it. */ | |
3260 | ||
3261 | if (*cont != '\\') | |
3262 | { | |
3263 | *acl_text++ = 0; | |
3264 | return yield; | |
3265 | } | |
3266 | ||
3267 | /* We have encountered a continuation. Skip over whitespace at the start of | |
3268 | the next line, and indeed the whole of the next line or lines if they are | |
3269 | comment lines. */ | |
3270 | ||
3271 | for (;;) | |
3272 | { | |
3273 | while (*(++acl_text) == ' ' || *acl_text == '\t'); | |
3274 | if (*acl_text != '#') break; | |
3275 | while (*(++acl_text) != 0 && *acl_text != '\n'); | |
3276 | } | |
3277 | ||
3278 | /* We have the start of a continuation line. Move all the rest of the data | |
3279 | to join onto the previous line, and then find its end. If the end is not a | |
3280 | newline, we are done. Otherwise loop to look for another continuation. */ | |
3281 | ||
3282 | memmove(cont, acl_text, acl_text_end - acl_text); | |
3283 | acl_text_end -= acl_text - cont; | |
3284 | acl_text = cont; | |
3285 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3286 | if (*acl_text == 0) return yield; | |
3287 | } | |
3288 | ||
3289 | /* Control does not reach here */ | |
3290 | } | |
3291 | ||
3292 | ||
3293 | ||
3294 | ||
3295 | ||
3296 | /************************************************* | |
3297 | * Check access using an ACL * | |
3298 | *************************************************/ | |
3299 | ||
3300 | /* This function is called from address_check. It may recurse via | |
3301 | acl_check_condition() - hence the use of a level to stop looping. The ACL is | |
3302 | passed as a string which is expanded. A forced failure implies no access check | |
3303 | is required. If the result is a single word, it is taken as the name of an ACL | |
3304 | which is sought in the global ACL tree. Otherwise, it is taken as literal ACL | |
3305 | text, complete with newlines, and parsed as such. In both cases, the ACL check | |
3306 | is then run. This function uses an auxiliary function for acl_read() to call | |
3307 | for reading individual lines of a literal ACL. This is acl_getline(), which | |
3308 | appears immediately above. | |
3309 | ||
3310 | Arguments: | |
3311 | where where called from | |
3312 | addr address item when called from RCPT; otherwise NULL | |
3313 | s the input string; NULL is the same as an empty ACL => DENY | |
3314 | level the nesting level | |
3315 | user_msgptr where to put a user error (for SMTP response) | |
3316 | log_msgptr where to put a logging message (not for SMTP response) | |
3317 | ||
3318 | Returns: OK access is granted | |
3319 | DISCARD access is apparently granted... | |
3320 | FAIL access is denied | |
3321 | FAIL_DROP access is denied; drop the connection | |
3322 | DEFER can't tell at the moment | |
3323 | ERROR disaster | |
3324 | */ | |
3325 | ||
3326 | static int | |
3327 | acl_check_internal(int where, address_item *addr, uschar *s, int level, | |
3328 | uschar **user_msgptr, uschar **log_msgptr) | |
3329 | { | |
3330 | int fd = -1; | |
3331 | acl_block *acl = NULL; | |
3332 | uschar *acl_name = US"inline ACL"; | |
3333 | uschar *ss; | |
3334 | ||
3335 | /* Catch configuration loops */ | |
3336 | ||
3337 | if (level > 20) | |
3338 | { | |
3339 | *log_msgptr = US"ACL nested too deep: possible loop"; | |
3340 | return ERROR; | |
3341 | } | |
3342 | ||
3343 | if (s == NULL) | |
3344 | { | |
3345 | HDEBUG(D_acl) debug_printf("ACL is NULL: implicit DENY\n"); | |
3346 | return FAIL; | |
3347 | } | |
3348 | ||
3349 | /* At top level, we expand the incoming string. At lower levels, it has already | |
3350 | been expanded as part of condition processing. */ | |
3351 | ||
3352 | if (level == 0) | |
3353 | { | |
3354 | ss = expand_string(s); | |
3355 | if (ss == NULL) | |
3356 | { | |
3357 | if (expand_string_forcedfail) return OK; | |
3358 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s, | |
3359 | expand_string_message); | |
3360 | return ERROR; | |
3361 | } | |
3362 | } | |
3363 | else ss = s; | |
3364 | ||
3365 | while (isspace(*ss))ss++; | |
3366 | ||
3367 | /* If we can't find a named ACL, the default is to parse it as an inline one. | |
3368 | (Unless it begins with a slash; non-existent files give rise to an error.) */ | |
3369 | ||
3370 | acl_text = ss; | |
3371 | ||
3372 | /* Handle the case of a string that does not contain any spaces. Look for a | |
3373 | named ACL among those read from the configuration, or a previously read file. | |
3374 | It is possible that the pointer to the ACL is NULL if the configuration | |
3375 | contains a name with no data. If not found, and the text begins with '/', | |
3376 | read an ACL from a file, and save it so it can be re-used. */ | |
3377 | ||
3378 | if (Ustrchr(ss, ' ') == NULL) | |
3379 | { | |
3380 | tree_node *t = tree_search(acl_anchor, ss); | |
3381 | if (t != NULL) | |
3382 | { | |
3383 | acl = (acl_block *)(t->data.ptr); | |
3384 | if (acl == NULL) | |
3385 | { | |
3386 | HDEBUG(D_acl) debug_printf("ACL \"%s\" is empty: implicit DENY\n", ss); | |
3387 | return FAIL; | |
3388 | } | |
3389 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
3390 | HDEBUG(D_acl) debug_printf("using ACL \"%s\"\n", ss); | |
3391 | } | |
3392 | ||
3393 | else if (*ss == '/') | |
3394 | { | |
3395 | struct stat statbuf; | |
3396 | fd = Uopen(ss, O_RDONLY, 0); | |
3397 | if (fd < 0) | |
3398 | { | |
3399 | *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss, | |
3400 | strerror(errno)); | |
3401 | return ERROR; | |
3402 | } | |
3403 | ||
3404 | if (fstat(fd, &statbuf) != 0) | |
3405 | { | |
3406 | *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss, | |
3407 | strerror(errno)); | |
3408 | return ERROR; | |
3409 | } | |
3410 | ||
3411 | acl_text = store_get(statbuf.st_size + 1); | |
3412 | acl_text_end = acl_text + statbuf.st_size + 1; | |
3413 | ||
3414 | if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size) | |
3415 | { | |
3416 | *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s", | |
3417 | ss, strerror(errno)); | |
3418 | return ERROR; | |
3419 | } | |
3420 | acl_text[statbuf.st_size] = 0; | |
f1e894f3 | 3421 | (void)close(fd); |
059ec3d9 PH |
3422 | |
3423 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
3424 | HDEBUG(D_acl) debug_printf("read ACL from file %s\n", ss); | |
3425 | } | |
3426 | } | |
3427 | ||
3428 | /* Parse an ACL that is still in text form. If it came from a file, remember it | |
3429 | in the ACL tree, having read it into the POOL_PERM store pool so that it | |
3430 | persists between multiple messages. */ | |
3431 | ||
3432 | if (acl == NULL) | |
3433 | { | |
3434 | int old_pool = store_pool; | |
3435 | if (fd >= 0) store_pool = POOL_PERM; | |
3436 | acl = acl_read(acl_getline, log_msgptr); | |
3437 | store_pool = old_pool; | |
3438 | if (acl == NULL && *log_msgptr != NULL) return ERROR; | |
3439 | if (fd >= 0) | |
3440 | { | |
3441 | tree_node *t = store_get_perm(sizeof(tree_node) + Ustrlen(ss)); | |
3442 | Ustrcpy(t->name, ss); | |
3443 | t->data.ptr = acl; | |
3444 | (void)tree_insertnode(&acl_anchor, t); | |
3445 | } | |
3446 | } | |
3447 | ||
3448 | /* Now we have an ACL to use. It's possible it may be NULL. */ | |
3449 | ||
3450 | while (acl != NULL) | |
3451 | { | |
3452 | int cond; | |
3453 | int basic_errno = 0; | |
3454 | BOOL endpass_seen = FALSE; | |
3455 | ||
3456 | *log_msgptr = *user_msgptr = NULL; | |
3457 | acl_temp_details = FALSE; | |
3458 | ||
7353285c | 3459 | if ((where == ACL_WHERE_QUIT || where == ACL_WHERE_NOTQUIT) && |
059ec3d9 PH |
3460 | acl->verb != ACL_ACCEPT && |
3461 | acl->verb != ACL_WARN) | |
3462 | { | |
7353285c | 3463 | *log_msgptr = string_sprintf("\"%s\" is not allowed in a QUIT or not-QUIT ACL", |
059ec3d9 PH |
3464 | verbs[acl->verb]); |
3465 | return ERROR; | |
3466 | } | |
3467 | ||
3468 | HDEBUG(D_acl) debug_printf("processing \"%s\"\n", verbs[acl->verb]); | |
3469 | ||
3470 | /* Clear out any search error message from a previous check before testing | |
3471 | this condition. */ | |
3472 | ||
3473 | search_error_message = NULL; | |
3474 | cond = acl_check_condition(acl->verb, acl->condition, where, addr, level, | |
3475 | &endpass_seen, user_msgptr, log_msgptr, &basic_errno); | |
3476 | ||
3477 | /* Handle special returns: DEFER causes a return except on a WARN verb; | |
3478 | ERROR always causes a return. */ | |
3479 | ||
3480 | switch (cond) | |
3481 | { | |
3482 | case DEFER: | |
3483 | HDEBUG(D_acl) debug_printf("%s: condition test deferred\n", verbs[acl->verb]); | |
3484 | if (basic_errno != ERRNO_CALLOUTDEFER) | |
3485 | { | |
3486 | if (search_error_message != NULL && *search_error_message != 0) | |
3487 | *log_msgptr = search_error_message; | |
3488 | if (smtp_return_error_details) acl_temp_details = TRUE; | |
3489 | } | |
3490 | else | |
3491 | { | |
3492 | acl_temp_details = TRUE; | |
3493 | } | |
3494 | if (acl->verb != ACL_WARN) return DEFER; | |
3495 | break; | |
3496 | ||
3497 | default: /* Paranoia */ | |
3498 | case ERROR: | |
3499 | HDEBUG(D_acl) debug_printf("%s: condition test error\n", verbs[acl->verb]); | |
3500 | return ERROR; | |
3501 | ||
3502 | case OK: | |
3503 | HDEBUG(D_acl) debug_printf("%s: condition test succeeded\n", | |
3504 | verbs[acl->verb]); | |
3505 | break; | |
3506 | ||
3507 | case FAIL: | |
3508 | HDEBUG(D_acl) debug_printf("%s: condition test failed\n", verbs[acl->verb]); | |
3509 | break; | |
3510 | ||
3511 | /* DISCARD and DROP can happen only from a nested ACL condition, and | |
3512 | DISCARD can happen only for an "accept" or "discard" verb. */ | |
3513 | ||
3514 | case DISCARD: | |
3515 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"discard\"\n", | |
3516 | verbs[acl->verb]); | |
3517 | break; | |
3518 | ||
3519 | case FAIL_DROP: | |
3520 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"drop\"\n", | |
3521 | verbs[acl->verb]); | |
3522 | break; | |
3523 | } | |
3524 | ||
3525 | /* At this point, cond for most verbs is either OK or FAIL or (as a result of | |
3526 | a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and | |
3527 | for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */ | |
3528 | ||
3529 | switch(acl->verb) | |
3530 | { | |
3531 | case ACL_ACCEPT: | |
3532 | if (cond == OK || cond == DISCARD) return cond; | |
3533 | if (endpass_seen) | |
3534 | { | |
3535 | HDEBUG(D_acl) debug_printf("accept: endpass encountered - denying access\n"); | |
3536 | return cond; | |
3537 | } | |
3538 | break; | |
3539 | ||
3540 | case ACL_DEFER: | |
3541 | if (cond == OK) | |
3542 | { | |
3543 | acl_temp_details = TRUE; | |
3544 | return DEFER; | |
3545 | } | |
3546 | break; | |
3547 | ||
3548 | case ACL_DENY: | |
3549 | if (cond == OK) return FAIL; | |
3550 | break; | |
3551 | ||
3552 | case ACL_DISCARD: | |
3553 | if (cond == OK || cond == DISCARD) return DISCARD; | |
3554 | if (endpass_seen) | |
3555 | { | |
3556 | HDEBUG(D_acl) debug_printf("discard: endpass encountered - denying access\n"); | |
3557 | return cond; | |
3558 | } | |
3559 | break; | |
3560 | ||
3561 | case ACL_DROP: | |
3562 | if (cond == OK) return FAIL_DROP; | |
3563 | break; | |
3564 | ||
3565 | case ACL_REQUIRE: | |
3566 | if (cond != OK) return cond; | |
3567 | break; | |
3568 | ||
3569 | case ACL_WARN: | |
3570 | if (cond == OK) | |
3571 | acl_warn(where, *user_msgptr, *log_msgptr); | |
49826d12 | 3572 | else if (cond == DEFER && (log_extra_selector & LX_acl_warn_skipped) != 0) |
9c7a242c PH |
3573 | log_write(0, LOG_MAIN, "%s Warning: ACL \"warn\" statement skipped: " |
3574 | "condition test deferred%s%s", host_and_ident(TRUE), | |
3575 | (*log_msgptr == NULL)? US"" : US": ", | |
3576 | (*log_msgptr == NULL)? US"" : *log_msgptr); | |
059ec3d9 PH |
3577 | *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */ |
3578 | break; | |
3579 | ||
3580 | default: | |
3581 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d", | |
3582 | acl->verb); | |
3583 | break; | |
3584 | } | |
3585 | ||
3586 | /* Pass to the next ACL item */ | |
3587 | ||
3588 | acl = acl->next; | |
3589 | } | |
3590 | ||
3591 | /* We have reached the end of the ACL. This is an implicit DENY. */ | |
3592 | ||
3593 | HDEBUG(D_acl) debug_printf("end of %s: implicit DENY\n", acl_name); | |
3594 | return FAIL; | |
3595 | } | |
3596 | ||
3597 | ||
3598 | /************************************************* | |
3599 | * Check access using an ACL * | |
3600 | *************************************************/ | |
3601 | ||
3602 | /* This is the external interface for ACL checks. It sets up an address and the | |
3603 | expansions for $domain and $local_part when called after RCPT, then calls | |
3604 | acl_check_internal() to do the actual work. | |
3605 | ||
3606 | Arguments: | |
3607 | where ACL_WHERE_xxxx indicating where called from | |
64ffc24f | 3608 | recipient RCPT address for RCPT check, else NULL |
059ec3d9 PH |
3609 | s the input string; NULL is the same as an empty ACL => DENY |
3610 | user_msgptr where to put a user error (for SMTP response) | |
3611 | log_msgptr where to put a logging message (not for SMTP response) | |
3612 | ||
3613 | Returns: OK access is granted by an ACCEPT verb | |
3614 | DISCARD access is granted by a DISCARD verb | |
3615 | FAIL access is denied | |
3616 | FAIL_DROP access is denied; drop the connection | |
3617 | DEFER can't tell at the moment | |
3618 | ERROR disaster | |
3619 | */ | |
3620 | ||
3621 | int | |
64ffc24f | 3622 | acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr, |
059ec3d9 PH |
3623 | uschar **log_msgptr) |
3624 | { | |
3625 | int rc; | |
3626 | address_item adb; | |
64ffc24f | 3627 | address_item *addr = NULL; |
059ec3d9 PH |
3628 | |
3629 | *user_msgptr = *log_msgptr = NULL; | |
3630 | sender_verified_failed = NULL; | |
fe0dab11 | 3631 | ratelimiters_cmd = NULL; |
6ea85e9a | 3632 | log_reject_target = LOG_MAIN|LOG_REJECT; |
059ec3d9 PH |
3633 | |
3634 | if (where == ACL_WHERE_RCPT) | |
3635 | { | |
3636 | adb = address_defaults; | |
3637 | addr = &adb; | |
64ffc24f | 3638 | addr->address = recipient; |
059ec3d9 PH |
3639 | if (deliver_split_address(addr) == DEFER) |
3640 | { | |
3641 | *log_msgptr = US"defer in percent_hack_domains check"; | |
3642 | return DEFER; | |
3643 | } | |
3644 | deliver_domain = addr->domain; | |
3645 | deliver_localpart = addr->local_part; | |
3646 | } | |
059ec3d9 PH |
3647 | |
3648 | rc = acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr); | |
3649 | ||
64ffc24f PH |
3650 | deliver_domain = deliver_localpart = deliver_address_data = |
3651 | sender_address_data = NULL; | |
059ec3d9 PH |
3652 | |
3653 | /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA | |
3654 | ACL, which is really in the middle of an SMTP command. */ | |
3655 | ||
3656 | if (rc == DISCARD) | |
3657 | { | |
3658 | if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA) | |
3659 | { | |
3660 | log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s " | |
3661 | "ACL", acl_wherenames[where]); | |
3662 | return ERROR; | |
3663 | } | |
3664 | return DISCARD; | |
3665 | } | |
3666 | ||
3667 | /* A DROP response is not permitted from MAILAUTH */ | |
3668 | ||
3669 | if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH) | |
3670 | { | |
3671 | log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s " | |
3672 | "ACL", acl_wherenames[where]); | |
3673 | return ERROR; | |
3674 | } | |
3675 | ||
4e88a19f PH |
3676 | /* Before giving a response, take a look at the length of any user message, and |
3677 | split it up into multiple lines if possible. */ | |
059ec3d9 | 3678 | |
e28326d8 PH |
3679 | *user_msgptr = string_split_message(*user_msgptr); |
3680 | if (fake_response != OK) | |
3681 | fake_response_text = string_split_message(fake_response_text); | |
059ec3d9 PH |
3682 | |
3683 | return rc; | |
3684 | } | |
3685 | ||
38a0a95f PH |
3686 | |
3687 | ||
3688 | /************************************************* | |
3689 | * Create ACL variable * | |
3690 | *************************************************/ | |
3691 | ||
3692 | /* Create an ACL variable or reuse an existing one. ACL variables are in a | |
3693 | binary tree (see tree.c) with acl_var_c and acl_var_m as root nodes. | |
3694 | ||
3695 | Argument: | |
3696 | name pointer to the variable's name, starting with c or m | |
3697 | ||
3698 | Returns the pointer to variable's tree node | |
3699 | */ | |
3700 | ||
3701 | tree_node * | |
3702 | acl_var_create(uschar *name) | |
3703 | { | |
3704 | tree_node *node, **root; | |
3705 | root = (name[0] == 'c')? &acl_var_c : &acl_var_m; | |
3706 | node = tree_search(*root, name); | |
3707 | if (node == NULL) | |
3708 | { | |
3709 | node = store_get(sizeof(tree_node) + Ustrlen(name)); | |
3710 | Ustrcpy(node->name, name); | |
3711 | (void)tree_insertnode(root, node); | |
3712 | } | |
3713 | node->data.ptr = NULL; | |
3714 | return node; | |
3715 | } | |
3716 | ||
3717 | ||
3718 | ||
3719 | /************************************************* | |
3720 | * Write an ACL variable in spool format * | |
3721 | *************************************************/ | |
3722 | ||
3723 | /* This function is used as a callback for tree_walk when writing variables to | |
3724 | the spool file. To retain spool file compatibility, what is written is -aclc or | |
3725 | -aclm followed by the rest of the name and the data length, space separated, | |
3726 | then the value itself, starting on a new line, and terminated by an additional | |
3727 | newline. When we had only numbered ACL variables, the first line might look | |
3728 | like this: "-aclc 5 20". Now it might be "-aclc foo 20" for the variable called | |
3729 | acl_cfoo. | |
3730 | ||
3731 | Arguments: | |
3732 | name of the variable | |
3733 | value of the variable | |
3734 | ctx FILE pointer (as a void pointer) | |
3735 | ||
3736 | Returns: nothing | |
3737 | */ | |
3738 | ||
3739 | void | |
3740 | acl_var_write(uschar *name, uschar *value, void *ctx) | |
3741 | { | |
3742 | FILE *f = (FILE *)ctx; | |
3743 | fprintf(f, "-acl%c %s %d\n%s\n", name[0], name+1, Ustrlen(value), value); | |
3744 | } | |
3745 | ||
059ec3d9 | 3746 | /* End of acl.c */ |