Commit | Line | Data |
---|---|---|
aa6dc513 | 1 | /* $Cambridge: exim/src/src/acl.c,v 1.76 2007/06/19 13:32:06 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 PH |
352 | /* Bit map vector of which conditions and modifiers are not allowed at certain |
353 | times. For each condition, there's a bitmap of dis-allowed times. For some, it | |
354 | is easier to specify the negation of a small number of allowed times. */ | |
059ec3d9 PH |
355 | |
356 | static unsigned int cond_forbids[] = { | |
357 | 0, /* acl */ | |
8e669ac1 | 358 | |
71fafd95 | 359 | (unsigned int) |
45b91596 | 360 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* add_header */ |
71fafd95 | 361 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
45b91596 PH |
362 | (1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)| |
363 | (1<<ACL_WHERE_NOTSMTP_START)), | |
71fafd95 | 364 | |
45b91596 PH |
365 | (1<<ACL_WHERE_NOTSMTP)| /* authenticated */ |
366 | (1<<ACL_WHERE_NOTSMTP_START)| | |
367 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO), | |
8e669ac1 | 368 | |
71fafd95 | 369 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
3864bb8e | 370 | (1<<ACL_WHERE_AUTH)| /* bmi_optin */ |
8523533c TK |
371 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
372 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_MIME)| | |
8e669ac1 | 373 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
8523533c TK |
374 | (1<<ACL_WHERE_MAILAUTH)| |
375 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 PH |
376 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_PREDATA)| |
377 | (1<<ACL_WHERE_NOTSMTP_START), | |
71fafd95 | 378 | #endif |
8e669ac1 | 379 | |
059ec3d9 | 380 | 0, /* condition */ |
8e669ac1 | 381 | |
c3611384 PH |
382 | 0, /* continue */ |
383 | ||
059ec3d9 | 384 | /* Certain types of control are always allowed, so we let it through |
2f079f46 | 385 | always and check in the control processing itself. */ |
8e669ac1 | 386 | |
059ec3d9 | 387 | 0, /* control */ |
8e669ac1 | 388 | |
71fafd95 | 389 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
390 | (unsigned int) |
391 | ~(1<<ACL_WHERE_MIME), /* decode */ | |
71fafd95 | 392 | #endif |
8523533c | 393 | |
059ec3d9 | 394 | 0, /* delay */ |
8e669ac1 | 395 | |
71fafd95 | 396 | #ifdef WITH_OLD_DEMIME |
2f079f46 PH |
397 | (unsigned int) |
398 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* demime */ | |
71fafd95 | 399 | #endif |
8e669ac1 | 400 | |
71fafd95 | 401 | #ifdef EXPERIMENTAL_DOMAINKEYS |
2f079f46 | 402 | (1<<ACL_WHERE_AUTH)| /* dk_domain_source */ |
fb2274d4 TK |
403 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
404 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
405 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
406 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
407 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 408 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 409 | |
2f079f46 | 410 | (1<<ACL_WHERE_AUTH)| /* dk_policy */ |
fb2274d4 TK |
411 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
412 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
413 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
414 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
415 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 416 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 417 | |
2f079f46 | 418 | (1<<ACL_WHERE_AUTH)| /* dk_sender_domains */ |
fb2274d4 TK |
419 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
420 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
421 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
422 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
423 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 424 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 425 | |
2f079f46 | 426 | (1<<ACL_WHERE_AUTH)| /* dk_sender_local_parts */ |
fb2274d4 TK |
427 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
428 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
429 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
430 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
431 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 432 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 433 | |
2f079f46 | 434 | (1<<ACL_WHERE_AUTH)| /* dk_senders */ |
fb2274d4 TK |
435 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
436 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
437 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
438 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
439 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 440 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 441 | |
2f079f46 | 442 | (1<<ACL_WHERE_AUTH)| /* dk_status */ |
fb2274d4 TK |
443 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
444 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
445 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
446 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
447 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 448 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
71fafd95 | 449 | #endif |
fb2274d4 | 450 | |
45b91596 PH |
451 | (1<<ACL_WHERE_NOTSMTP)| /* dnslists */ |
452 | (1<<ACL_WHERE_NOTSMTP_START), | |
059ec3d9 | 453 | |
2f079f46 PH |
454 | (unsigned int) |
455 | ~(1<<ACL_WHERE_RCPT), /* domains */ | |
059ec3d9 | 456 | |
45b91596 PH |
457 | (1<<ACL_WHERE_NOTSMTP)| /* encrypted */ |
458 | (1<<ACL_WHERE_CONNECT)| | |
459 | (1<<ACL_WHERE_NOTSMTP_START)| | |
059ec3d9 | 460 | (1<<ACL_WHERE_HELO), |
8e669ac1 | 461 | |
059ec3d9 | 462 | 0, /* endpass */ |
8e669ac1 | 463 | |
45b91596 PH |
464 | (1<<ACL_WHERE_NOTSMTP)| /* hosts */ |
465 | (1<<ACL_WHERE_NOTSMTP_START), | |
059ec3d9 | 466 | |
2f079f46 PH |
467 | (unsigned int) |
468 | ~(1<<ACL_WHERE_RCPT), /* local_parts */ | |
059ec3d9 PH |
469 | |
470 | 0, /* log_message */ | |
8e669ac1 | 471 | |
6ea85e9a PH |
472 | 0, /* log_reject_target */ |
473 | ||
059ec3d9 | 474 | 0, /* logwrite */ |
8e669ac1 | 475 | |
71fafd95 | 476 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
477 | (unsigned int) |
478 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* malware */ | |
71fafd95 | 479 | #endif |
8523533c | 480 | |
059ec3d9 PH |
481 | 0, /* message */ |
482 | ||
71fafd95 | 483 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
484 | (unsigned int) |
485 | ~(1<<ACL_WHERE_MIME), /* mime_regex */ | |
71fafd95 | 486 | #endif |
8523533c | 487 | |
870f6ba8 TF |
488 | 0, /* ratelimit */ |
489 | ||
2f079f46 PH |
490 | (unsigned int) |
491 | ~(1<<ACL_WHERE_RCPT), /* recipients */ | |
059ec3d9 | 492 | |
71fafd95 | 493 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
494 | (unsigned int) |
495 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* regex */ | |
496 | (1<<ACL_WHERE_MIME)), | |
71fafd95 | 497 | #endif |
8523533c | 498 | |
059ec3d9 PH |
499 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* sender_domains */ |
500 | (1<<ACL_WHERE_HELO)| | |
501 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
502 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
503 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
504 | ||
505 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* senders */ | |
506 | (1<<ACL_WHERE_HELO)| | |
507 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
508 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
509 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
510 | ||
511 | 0, /* set */ | |
512 | ||
71fafd95 | 513 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
514 | (unsigned int) |
515 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* spam */ | |
71fafd95 | 516 | #endif |
8523533c | 517 | |
71fafd95 | 518 | #ifdef EXPERIMENTAL_SPF |
8523533c TK |
519 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf */ |
520 | (1<<ACL_WHERE_HELO)| | |
521 | (1<<ACL_WHERE_MAILAUTH)| | |
522 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
45b91596 PH |
523 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY)| |
524 | (1<<ACL_WHERE_NOTSMTP)| | |
525 | (1<<ACL_WHERE_NOTSMTP_START), | |
71fafd95 | 526 | #endif |
8523533c | 527 | |
059ec3d9 PH |
528 | /* Certain types of verify are always allowed, so we let it through |
529 | always and check in the verify function itself */ | |
530 | ||
531 | 0 /* verify */ | |
059ec3d9 PH |
532 | }; |
533 | ||
534 | ||
c5fcb476 PH |
535 | /* Bit map vector of which controls are not allowed at certain times. For |
536 | each control, there's a bitmap of dis-allowed times. For some, it is easier to | |
537 | specify the negation of a small number of allowed times. */ | |
538 | ||
539 | static unsigned int control_forbids[] = { | |
c46782ef PH |
540 | (unsigned int) |
541 | ~((1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)), /* allow_auth_unadvertised */ | |
542 | ||
543 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
8523533c | 544 | 0, /* bmi_run */ |
c46782ef PH |
545 | #endif |
546 | ||
547 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
45b91596 PH |
548 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dk_verify */ |
549 | (1<<ACL_WHERE_NOTSMTP_START), | |
c46782ef | 550 | #endif |
3e11c26b | 551 | |
c5fcb476 | 552 | 0, /* error */ |
8e669ac1 PH |
553 | |
554 | (unsigned int) | |
c5fcb476 | 555 | ~(1<<ACL_WHERE_RCPT), /* caseful_local_part */ |
8e669ac1 PH |
556 | |
557 | (unsigned int) | |
c5fcb476 | 558 | ~(1<<ACL_WHERE_RCPT), /* caselower_local_part */ |
8e669ac1 | 559 | |
45b91596 PH |
560 | (1<<ACL_WHERE_NOTSMTP)| /* enforce_sync */ |
561 | (1<<ACL_WHERE_NOTSMTP_START), | |
8e669ac1 | 562 | |
45b91596 PH |
563 | (1<<ACL_WHERE_NOTSMTP)| /* no_enforce_sync */ |
564 | (1<<ACL_WHERE_NOTSMTP_START), | |
8e669ac1 PH |
565 | |
566 | (unsigned int) | |
c5fcb476 PH |
567 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* freeze */ |
568 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
e715ad22 | 569 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
570 | |
571 | (unsigned int) | |
c5fcb476 PH |
572 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* queue_only */ |
573 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
e715ad22 | 574 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
575 | |
576 | (unsigned int) | |
c5fcb476 | 577 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* submission */ |
8e669ac1 | 578 | (1<<ACL_WHERE_PREDATA)), |
8523533c | 579 | |
8800895a PH |
580 | (unsigned int) |
581 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* suppress_local_fixups */ | |
45b91596 PH |
582 | (1<<ACL_WHERE_PREDATA)| |
583 | (1<<ACL_WHERE_NOTSMTP_START)), | |
8800895a | 584 | |
c46782ef | 585 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 586 | (unsigned int) |
14d57970 | 587 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* no_mbox_unspool */ |
e715ad22 TK |
588 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
589 | (1<<ACL_WHERE_MIME)), | |
c46782ef | 590 | #endif |
a6c4ab60 | 591 | |
29aba418 TF |
592 | (unsigned int) |
593 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakedefer */ | |
594 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
595 | (1<<ACL_WHERE_MIME)), | |
596 | ||
8e669ac1 | 597 | (unsigned int) |
a6c4ab60 | 598 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakereject */ |
e715ad22 TK |
599 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
600 | (1<<ACL_WHERE_MIME)), | |
8523533c | 601 | |
45b91596 | 602 | (1<<ACL_WHERE_NOTSMTP)| /* no_multiline */ |
cf8b11a5 PH |
603 | (1<<ACL_WHERE_NOTSMTP_START), |
604 | ||
605 | (1<<ACL_WHERE_NOTSMTP)| /* no_pipelining */ | |
047bdd8c PH |
606 | (1<<ACL_WHERE_NOTSMTP_START), |
607 | ||
608 | (1<<ACL_WHERE_NOTSMTP)| /* no_delay_flush */ | |
4c590bd1 PH |
609 | (1<<ACL_WHERE_NOTSMTP_START), |
610 | ||
611 | (1<<ACL_WHERE_NOTSMTP)| /* no_callout_flush */ | |
45b91596 | 612 | (1<<ACL_WHERE_NOTSMTP_START) |
c5fcb476 PH |
613 | }; |
614 | ||
615 | /* Structure listing various control arguments, with their characteristics. */ | |
059ec3d9 PH |
616 | |
617 | typedef struct control_def { | |
618 | uschar *name; | |
619 | int value; /* CONTROL_xxx value */ | |
059ec3d9 PH |
620 | BOOL has_option; /* Has /option(s) following */ |
621 | } control_def; | |
622 | ||
623 | static control_def controls_list[] = { | |
c46782ef | 624 | { US"allow_auth_unadvertised", CONTROL_AUTH_UNADVERTISED, FALSE }, |
8523533c | 625 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
c46782ef | 626 | { US"bmi_run", CONTROL_BMI_RUN, FALSE }, |
fb2274d4 TK |
627 | #endif |
628 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
c46782ef | 629 | { US"dk_verify", CONTROL_DK_VERIFY, FALSE }, |
8523533c | 630 | #endif |
c46782ef PH |
631 | { US"caseful_local_part", CONTROL_CASEFUL_LOCAL_PART, FALSE }, |
632 | { US"caselower_local_part", CONTROL_CASELOWER_LOCAL_PART, FALSE }, | |
633 | { US"enforce_sync", CONTROL_ENFORCE_SYNC, FALSE }, | |
634 | { US"freeze", CONTROL_FREEZE, TRUE }, | |
4c590bd1 | 635 | { US"no_callout_flush", CONTROL_NO_CALLOUT_FLUSH, FALSE }, |
047bdd8c | 636 | { US"no_delay_flush", CONTROL_NO_DELAY_FLUSH, FALSE }, |
c46782ef PH |
637 | { US"no_enforce_sync", CONTROL_NO_ENFORCE_SYNC, FALSE }, |
638 | { US"no_multiline_responses", CONTROL_NO_MULTILINE, FALSE }, | |
cf8b11a5 | 639 | { US"no_pipelining", CONTROL_NO_PIPELINING, FALSE }, |
c46782ef | 640 | { US"queue_only", CONTROL_QUEUE_ONLY, FALSE }, |
8523533c | 641 | #ifdef WITH_CONTENT_SCAN |
c46782ef | 642 | { US"no_mbox_unspool", CONTROL_NO_MBOX_UNSPOOL, FALSE }, |
8523533c | 643 | #endif |
c46782ef PH |
644 | { US"fakedefer", CONTROL_FAKEDEFER, TRUE }, |
645 | { US"fakereject", CONTROL_FAKEREJECT, TRUE }, | |
646 | { US"submission", CONTROL_SUBMISSION, TRUE }, | |
647 | { US"suppress_local_fixups", CONTROL_SUPPRESS_LOCAL_FIXUPS, FALSE } | |
059ec3d9 PH |
648 | }; |
649 | ||
e5a9dba6 PH |
650 | /* Support data structures for Client SMTP Authorization. acl_verify_csa() |
651 | caches its result in a tree to avoid repeated DNS queries. The result is an | |
652 | integer code which is used as an index into the following tables of | |
653 | explanatory strings and verification return codes. */ | |
654 | ||
655 | static tree_node *csa_cache = NULL; | |
656 | ||
657 | enum { CSA_UNKNOWN, CSA_OK, CSA_DEFER_SRV, CSA_DEFER_ADDR, | |
658 | CSA_FAIL_EXPLICIT, CSA_FAIL_DOMAIN, CSA_FAIL_NOADDR, CSA_FAIL_MISMATCH }; | |
659 | ||
660 | /* The acl_verify_csa() return code is translated into an acl_verify() return | |
661 | code using the following table. It is OK unless the client is definitely not | |
662 | authorized. This is because CSA is supposed to be optional for sending sites, | |
663 | so recipients should not be too strict about checking it - especially because | |
664 | DNS problems are quite likely to occur. It's possible to use $csa_status in | |
665 | further ACL conditions to distinguish ok, unknown, and defer if required, but | |
666 | the aim is to make the usual configuration simple. */ | |
667 | ||
668 | static int csa_return_code[] = { | |
669 | OK, OK, OK, OK, | |
670 | FAIL, FAIL, FAIL, FAIL | |
671 | }; | |
672 | ||
673 | static uschar *csa_status_string[] = { | |
674 | US"unknown", US"ok", US"defer", US"defer", | |
675 | US"fail", US"fail", US"fail", US"fail" | |
676 | }; | |
677 | ||
678 | static uschar *csa_reason_string[] = { | |
679 | US"unknown", | |
680 | US"ok", | |
681 | US"deferred (SRV lookup failed)", | |
682 | US"deferred (target address lookup failed)", | |
683 | US"failed (explicit authorization required)", | |
684 | US"failed (host name not authorized)", | |
685 | US"failed (no authorized addresses)", | |
686 | US"failed (client address mismatch)" | |
687 | }; | |
688 | ||
059ec3d9 PH |
689 | /* Enable recursion between acl_check_internal() and acl_check_condition() */ |
690 | ||
691 | static int acl_check_internal(int, address_item *, uschar *, int, uschar **, | |
692 | uschar **); | |
693 | ||
694 | ||
695 | /************************************************* | |
696 | * Pick out name from list * | |
697 | *************************************************/ | |
698 | ||
699 | /* Use a binary chop method | |
700 | ||
701 | Arguments: | |
702 | name name to find | |
703 | list list of names | |
704 | end size of list | |
705 | ||
706 | Returns: offset in list, or -1 if not found | |
707 | */ | |
708 | ||
709 | static int | |
710 | acl_checkname(uschar *name, uschar **list, int end) | |
711 | { | |
712 | int start = 0; | |
713 | ||
714 | while (start < end) | |
715 | { | |
716 | int mid = (start + end)/2; | |
717 | int c = Ustrcmp(name, list[mid]); | |
718 | if (c == 0) return mid; | |
719 | if (c < 0) end = mid; else start = mid + 1; | |
720 | } | |
721 | ||
722 | return -1; | |
723 | } | |
724 | ||
725 | ||
726 | /************************************************* | |
727 | * Read and parse one ACL * | |
728 | *************************************************/ | |
729 | ||
730 | /* This function is called both from readconf in order to parse the ACLs in the | |
731 | configuration file, and also when an ACL is encountered dynamically (e.g. as | |
732 | the result of an expansion). It is given a function to call in order to | |
733 | retrieve the lines of the ACL. This function handles skipping comments and | |
734 | blank lines (where relevant). | |
735 | ||
736 | Arguments: | |
737 | func function to get next line of ACL | |
738 | error where to put an error message | |
739 | ||
740 | Returns: pointer to ACL, or NULL | |
741 | NULL can be legal (empty ACL); in this case error will be NULL | |
742 | */ | |
743 | ||
744 | acl_block * | |
745 | acl_read(uschar *(*func)(void), uschar **error) | |
746 | { | |
747 | acl_block *yield = NULL; | |
748 | acl_block **lastp = &yield; | |
749 | acl_block *this = NULL; | |
750 | acl_condition_block *cond; | |
751 | acl_condition_block **condp = NULL; | |
752 | uschar *s; | |
753 | ||
754 | *error = NULL; | |
755 | ||
756 | while ((s = (*func)()) != NULL) | |
757 | { | |
758 | int v, c; | |
759 | BOOL negated = FALSE; | |
760 | uschar *saveline = s; | |
761 | uschar name[64]; | |
762 | ||
763 | /* Conditions (but not verbs) are allowed to be negated by an initial | |
764 | exclamation mark. */ | |
765 | ||
766 | while (isspace(*s)) s++; | |
767 | if (*s == '!') | |
768 | { | |
769 | negated = TRUE; | |
770 | s++; | |
771 | } | |
772 | ||
cf00dad6 PH |
773 | /* Read the name of a verb or a condition, or the start of a new ACL, which |
774 | can be started by a name, or by a macro definition. */ | |
059ec3d9 PH |
775 | |
776 | s = readconf_readname(name, sizeof(name), s); | |
b8dc3e4a | 777 | if (*s == ':' || (isupper(name[0]) && *s == '=')) return yield; |
059ec3d9 PH |
778 | |
779 | /* If a verb is unrecognized, it may be another condition or modifier that | |
780 | continues the previous verb. */ | |
781 | ||
782 | v = acl_checkname(name, verbs, sizeof(verbs)/sizeof(char *)); | |
783 | if (v < 0) | |
784 | { | |
785 | if (this == NULL) | |
786 | { | |
4e167a8c PH |
787 | *error = string_sprintf("unknown ACL verb \"%s\" in \"%s\"", name, |
788 | saveline); | |
059ec3d9 PH |
789 | return NULL; |
790 | } | |
791 | } | |
792 | ||
793 | /* New verb */ | |
794 | ||
795 | else | |
796 | { | |
797 | if (negated) | |
798 | { | |
799 | *error = string_sprintf("malformed ACL line \"%s\"", saveline); | |
800 | return NULL; | |
801 | } | |
802 | this = store_get(sizeof(acl_block)); | |
803 | *lastp = this; | |
804 | lastp = &(this->next); | |
805 | this->next = NULL; | |
806 | this->verb = v; | |
807 | this->condition = NULL; | |
808 | condp = &(this->condition); | |
809 | if (*s == 0) continue; /* No condition on this line */ | |
810 | if (*s == '!') | |
811 | { | |
812 | negated = TRUE; | |
813 | s++; | |
814 | } | |
815 | s = readconf_readname(name, sizeof(name), s); /* Condition name */ | |
816 | } | |
817 | ||
818 | /* Handle a condition or modifier. */ | |
819 | ||
820 | c = acl_checkname(name, conditions, sizeof(conditions)/sizeof(char *)); | |
821 | if (c < 0) | |
822 | { | |
823 | *error = string_sprintf("unknown ACL condition/modifier in \"%s\"", | |
824 | saveline); | |
825 | return NULL; | |
826 | } | |
827 | ||
828 | /* The modifiers may not be negated */ | |
829 | ||
830 | if (negated && cond_modifiers[c]) | |
831 | { | |
832 | *error = string_sprintf("ACL error: negation is not allowed with " | |
833 | "\"%s\"", conditions[c]); | |
834 | return NULL; | |
835 | } | |
836 | ||
837 | /* ENDPASS may occur only with ACCEPT or DISCARD. */ | |
838 | ||
839 | if (c == ACLC_ENDPASS && | |
840 | this->verb != ACL_ACCEPT && | |
841 | this->verb != ACL_DISCARD) | |
842 | { | |
843 | *error = string_sprintf("ACL error: \"%s\" is not allowed with \"%s\"", | |
844 | conditions[c], verbs[this->verb]); | |
845 | return NULL; | |
846 | } | |
847 | ||
848 | cond = store_get(sizeof(acl_condition_block)); | |
849 | cond->next = NULL; | |
850 | cond->type = c; | |
851 | cond->u.negated = negated; | |
852 | ||
853 | *condp = cond; | |
854 | condp = &(cond->next); | |
855 | ||
856 | /* The "set" modifier is different in that its argument is "name=value" | |
857 | rather than just a value, and we can check the validity of the name, which | |
38a0a95f PH |
858 | gives us a variable name to insert into the data block. The original ACL |
859 | variable names were acl_c0 ... acl_c9 and acl_m0 ... acl_m9. This was | |
860 | extended to 20 of each type, but after that people successfully argued for | |
641cb756 PH |
861 | arbitrary names. In the new scheme, the names must start with acl_c or acl_m. |
862 | After that, we allow alphanumerics and underscores, but the first character | |
863 | after c or m must be a digit or an underscore. This retains backwards | |
864 | compatibility. */ | |
059ec3d9 PH |
865 | |
866 | if (c == ACLC_SET) | |
867 | { | |
47ca6d6c PH |
868 | uschar *endptr; |
869 | ||
38a0a95f PH |
870 | if (Ustrncmp(s, "acl_c", 5) != 0 && |
871 | Ustrncmp(s, "acl_m", 5) != 0) | |
47ca6d6c | 872 | { |
38a0a95f PH |
873 | *error = string_sprintf("invalid variable name after \"set\" in ACL " |
874 | "modifier \"set %s\" (must start \"acl_c\" or \"acl_m\")", s); | |
875 | return NULL; | |
47ca6d6c | 876 | } |
38a0a95f PH |
877 | |
878 | endptr = s + 5; | |
641cb756 PH |
879 | if (!isdigit(*endptr) && *endptr != '_') |
880 | { | |
881 | *error = string_sprintf("invalid variable name after \"set\" in ACL " | |
882 | "modifier \"set %s\" (digit or underscore must follow acl_c or acl_m)", | |
883 | s); | |
884 | return NULL; | |
885 | } | |
886 | ||
38a0a95f | 887 | while (*endptr != 0 && *endptr != '=' && !isspace(*endptr)) |
47ca6d6c | 888 | { |
38a0a95f PH |
889 | if (!isalnum(*endptr) && *endptr != '_') |
890 | { | |
891 | *error = string_sprintf("invalid character \"%c\" in variable name " | |
892 | "in ACL modifier \"set %s\"", *endptr, s); | |
893 | return NULL; | |
894 | } | |
895 | endptr++; | |
47ca6d6c | 896 | } |
47ca6d6c | 897 | |
38a0a95f | 898 | cond->u.varname = string_copyn(s + 4, endptr - s - 4); |
47ca6d6c | 899 | s = endptr; |
059ec3d9 PH |
900 | while (isspace(*s)) s++; |
901 | } | |
902 | ||
903 | /* For "set", we are now positioned for the data. For the others, only | |
904 | "endpass" has no data */ | |
905 | ||
906 | if (c != ACLC_ENDPASS) | |
907 | { | |
908 | if (*s++ != '=') | |
909 | { | |
910 | *error = string_sprintf("\"=\" missing after ACL \"%s\" %s", name, | |
911 | cond_modifiers[c]? US"modifier" : US"condition"); | |
912 | return NULL; | |
913 | } | |
914 | while (isspace(*s)) s++; | |
915 | cond->arg = string_copy(s); | |
916 | } | |
917 | } | |
918 | ||
919 | return yield; | |
920 | } | |
921 | ||
922 | ||
923 | ||
71fafd95 PH |
924 | /************************************************* |
925 | * Set up added header line(s) * | |
926 | *************************************************/ | |
927 | ||
928 | /* This function is called by the add_header modifier, and also from acl_warn() | |
929 | to implement the now-deprecated way of adding header lines using "message" on a | |
930 | "warn" verb. The argument is treated as a sequence of header lines which are | |
931 | added to a chain, provided there isn't an identical one already there. | |
932 | ||
933 | Argument: string of header lines | |
934 | Returns: nothing | |
935 | */ | |
936 | ||
937 | static void | |
938 | setup_header(uschar *hstring) | |
939 | { | |
940 | uschar *p, *q; | |
941 | int hlen = Ustrlen(hstring); | |
942 | ||
943 | /* An empty string does nothing; otherwise add a final newline if necessary. */ | |
944 | ||
945 | if (hlen <= 0) return; | |
946 | if (hstring[hlen-1] != '\n') hstring = string_sprintf("%s\n", hstring); | |
947 | ||
948 | /* Loop for multiple header lines, taking care about continuations */ | |
949 | ||
950 | for (p = q = hstring; *p != 0; ) | |
951 | { | |
952 | uschar *s; | |
953 | int newtype = htype_add_bot; | |
954 | header_line **hptr = &acl_added_headers; | |
955 | ||
956 | /* Find next header line within the string */ | |
957 | ||
958 | for (;;) | |
959 | { | |
960 | q = Ustrchr(q, '\n'); | |
961 | if (*(++q) != ' ' && *q != '\t') break; | |
962 | } | |
963 | ||
964 | /* If the line starts with a colon, interpret the instruction for where to | |
965 | add it. This temporarily sets up a new type. */ | |
966 | ||
967 | if (*p == ':') | |
968 | { | |
969 | if (strncmpic(p, US":after_received:", 16) == 0) | |
970 | { | |
971 | newtype = htype_add_rec; | |
972 | p += 16; | |
973 | } | |
974 | else if (strncmpic(p, US":at_start_rfc:", 14) == 0) | |
975 | { | |
976 | newtype = htype_add_rfc; | |
977 | p += 14; | |
978 | } | |
979 | else if (strncmpic(p, US":at_start:", 10) == 0) | |
980 | { | |
981 | newtype = htype_add_top; | |
982 | p += 10; | |
983 | } | |
984 | else if (strncmpic(p, US":at_end:", 8) == 0) | |
985 | { | |
986 | newtype = htype_add_bot; | |
987 | p += 8; | |
988 | } | |
989 | while (*p == ' ' || *p == '\t') p++; | |
990 | } | |
991 | ||
992 | /* See if this line starts with a header name, and if not, add X-ACL-Warn: | |
993 | to the front of it. */ | |
994 | ||
995 | for (s = p; s < q - 1; s++) | |
996 | { | |
997 | if (*s == ':' || !isgraph(*s)) break; | |
998 | } | |
999 | ||
1000 | s = string_sprintf("%s%.*s", (*s == ':')? "" : "X-ACL-Warn: ", q - p, p); | |
1001 | hlen = Ustrlen(s); | |
1002 | ||
1003 | /* See if this line has already been added */ | |
1004 | ||
1005 | while (*hptr != NULL) | |
1006 | { | |
1007 | if (Ustrncmp((*hptr)->text, s, hlen) == 0) break; | |
1008 | hptr = &((*hptr)->next); | |
1009 | } | |
1010 | ||
1011 | /* Add if not previously present */ | |
1012 | ||
1013 | if (*hptr == NULL) | |
1014 | { | |
1015 | header_line *h = store_get(sizeof(header_line)); | |
1016 | h->text = s; | |
1017 | h->next = NULL; | |
1018 | h->type = newtype; | |
1019 | h->slen = hlen; | |
1020 | *hptr = h; | |
1021 | hptr = &(h->next); | |
1022 | } | |
1023 | ||
1024 | /* Advance for next header line within the string */ | |
1025 | ||
1026 | p = q; | |
1027 | } | |
1028 | } | |
1029 | ||
1030 | ||
1031 | ||
1032 | ||
059ec3d9 PH |
1033 | /************************************************* |
1034 | * Handle warnings * | |
1035 | *************************************************/ | |
1036 | ||
1037 | /* This function is called when a WARN verb's conditions are true. It adds to | |
1038 | the message's headers, and/or writes information to the log. In each case, this | |
1039 | only happens once (per message for headers, per connection for log). | |
1040 | ||
71fafd95 PH |
1041 | ** NOTE: The header adding action using the "message" setting is historic, and |
1042 | its use is now deprecated. The new add_header modifier should be used instead. | |
1043 | ||
059ec3d9 PH |
1044 | Arguments: |
1045 | where ACL_WHERE_xxxx indicating which ACL this is | |
1046 | user_message message for adding to headers | |
1047 | log_message message for logging, if different | |
1048 | ||
1049 | Returns: nothing | |
1050 | */ | |
1051 | ||
1052 | static void | |
1053 | acl_warn(int where, uschar *user_message, uschar *log_message) | |
1054 | { | |
059ec3d9 PH |
1055 | if (log_message != NULL && log_message != user_message) |
1056 | { | |
1057 | uschar *text; | |
1058 | string_item *logged; | |
1059 | ||
1060 | text = string_sprintf("%s Warning: %s", host_and_ident(TRUE), | |
1061 | string_printing(log_message)); | |
1062 | ||
1063 | /* If a sender verification has failed, and the log message is "sender verify | |
1064 | failed", add the failure message. */ | |
1065 | ||
1066 | if (sender_verified_failed != NULL && | |
1067 | sender_verified_failed->message != NULL && | |
1068 | strcmpic(log_message, US"sender verify failed") == 0) | |
1069 | text = string_sprintf("%s: %s", text, sender_verified_failed->message); | |
1070 | ||
9c7a242c PH |
1071 | /* Search previously logged warnings. They are kept in malloc |
1072 | store so they can be freed at the start of a new message. */ | |
059ec3d9 PH |
1073 | |
1074 | for (logged = acl_warn_logged; logged != NULL; logged = logged->next) | |
1075 | if (Ustrcmp(logged->text, text) == 0) break; | |
1076 | ||
1077 | if (logged == NULL) | |
1078 | { | |
1079 | int length = Ustrlen(text) + 1; | |
1080 | log_write(0, LOG_MAIN, "%s", text); | |
1081 | logged = store_malloc(sizeof(string_item) + length); | |
1082 | logged->text = (uschar *)logged + sizeof(string_item); | |
1083 | memcpy(logged->text, text, length); | |
1084 | logged->next = acl_warn_logged; | |
1085 | acl_warn_logged = logged; | |
1086 | } | |
1087 | } | |
1088 | ||
1089 | /* If there's no user message, we are done. */ | |
1090 | ||
1091 | if (user_message == NULL) return; | |
1092 | ||
1093 | /* If this isn't a message ACL, we can't do anything with a user message. | |
1094 | Log an error. */ | |
1095 | ||
1096 | if (where > ACL_WHERE_NOTSMTP) | |
1097 | { | |
1098 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting " | |
1099 | "found in a non-message (%s) ACL: cannot specify header lines here: " | |
1100 | "message ignored", acl_wherenames[where]); | |
1101 | return; | |
1102 | } | |
1103 | ||
71fafd95 PH |
1104 | /* The code for setting up header lines is now abstracted into a separate |
1105 | function so that it can be used for the add_header modifier as well. */ | |
059ec3d9 | 1106 | |
71fafd95 | 1107 | setup_header(user_message); |
059ec3d9 PH |
1108 | } |
1109 | ||
1110 | ||
1111 | ||
1112 | /************************************************* | |
1113 | * Verify and check reverse DNS * | |
1114 | *************************************************/ | |
1115 | ||
1116 | /* Called from acl_verify() below. We look up the host name(s) of the client IP | |
1117 | address if this has not yet been done. The host_name_lookup() function checks | |
1118 | that one of these names resolves to an address list that contains the client IP | |
1119 | address, so we don't actually have to do the check here. | |
1120 | ||
1121 | Arguments: | |
1122 | user_msgptr pointer for user message | |
1123 | log_msgptr pointer for log message | |
1124 | ||
1125 | Returns: OK verification condition succeeded | |
1126 | FAIL verification failed | |
1127 | DEFER there was a problem verifying | |
1128 | */ | |
1129 | ||
1130 | static int | |
1131 | acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr) | |
1132 | { | |
1133 | int rc; | |
1134 | ||
1135 | user_msgptr = user_msgptr; /* stop compiler warning */ | |
1136 | ||
1137 | /* Previous success */ | |
1138 | ||
1139 | if (sender_host_name != NULL) return OK; | |
1140 | ||
1141 | /* Previous failure */ | |
1142 | ||
1143 | if (host_lookup_failed) | |
1144 | { | |
1145 | *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg); | |
1146 | return FAIL; | |
1147 | } | |
1148 | ||
1149 | /* Need to do a lookup */ | |
1150 | ||
1151 | HDEBUG(D_acl) | |
1152 | debug_printf("looking up host name to force name/address consistency check\n"); | |
1153 | ||
1154 | if ((rc = host_name_lookup()) != OK) | |
1155 | { | |
1156 | *log_msgptr = (rc == DEFER)? | |
1157 | US"host lookup deferred for reverse lookup check" | |
1158 | : | |
1159 | string_sprintf("host lookup failed for reverse lookup check%s", | |
1160 | host_lookup_msg); | |
1161 | return rc; /* DEFER or FAIL */ | |
1162 | } | |
1163 | ||
1164 | host_build_sender_fullhost(); | |
1165 | return OK; | |
1166 | } | |
1167 | ||
1168 | ||
1169 | ||
e5a9dba6 PH |
1170 | /************************************************* |
1171 | * Check client IP address matches CSA target * | |
1172 | *************************************************/ | |
1173 | ||
1174 | /* Called from acl_verify_csa() below. This routine scans a section of a DNS | |
1175 | response for address records belonging to the CSA target hostname. The section | |
1176 | is specified by the reset argument, either RESET_ADDITIONAL or RESET_ANSWERS. | |
1177 | If one of the addresses matches the client's IP address, then the client is | |
1178 | authorized by CSA. If there are target IP addresses but none of them match | |
1179 | then the client is using an unauthorized IP address. If there are no target IP | |
1180 | addresses then the client cannot be using an authorized IP address. (This is | |
1181 | an odd configuration - why didn't the SRV record have a weight of 1 instead?) | |
1182 | ||
1183 | Arguments: | |
1184 | dnsa the DNS answer block | |
1185 | dnss a DNS scan block for us to use | |
1186 | reset option specifing what portion to scan, as described above | |
1187 | target the target hostname to use for matching RR names | |
1188 | ||
1189 | Returns: CSA_OK successfully authorized | |
1190 | CSA_FAIL_MISMATCH addresses found but none matched | |
1191 | CSA_FAIL_NOADDR no target addresses found | |
1192 | */ | |
1193 | ||
1194 | static int | |
1195 | acl_verify_csa_address(dns_answer *dnsa, dns_scan *dnss, int reset, | |
1196 | uschar *target) | |
1197 | { | |
1198 | dns_record *rr; | |
1199 | dns_address *da; | |
1200 | ||
1201 | BOOL target_found = FALSE; | |
1202 | ||
1203 | for (rr = dns_next_rr(dnsa, dnss, reset); | |
1204 | rr != NULL; | |
1205 | rr = dns_next_rr(dnsa, dnss, RESET_NEXT)) | |
1206 | { | |
1207 | /* Check this is an address RR for the target hostname. */ | |
1208 | ||
1209 | if (rr->type != T_A | |
1210 | #if HAVE_IPV6 | |
1211 | && rr->type != T_AAAA | |
1212 | #ifdef SUPPORT_A6 | |
1213 | && rr->type != T_A6 | |
1214 | #endif | |
1215 | #endif | |
1216 | ) continue; | |
1217 | ||
1218 | if (strcmpic(target, rr->name) != 0) continue; | |
1219 | ||
1220 | target_found = TRUE; | |
1221 | ||
1222 | /* Turn the target address RR into a list of textual IP addresses and scan | |
1223 | the list. There may be more than one if it is an A6 RR. */ | |
1224 | ||
1225 | for (da = dns_address_from_rr(dnsa, rr); da != NULL; da = da->next) | |
1226 | { | |
1227 | /* If the client IP address matches the target IP address, it's good! */ | |
1228 | ||
1229 | DEBUG(D_acl) debug_printf("CSA target address is %s\n", da->address); | |
1230 | ||
1231 | if (strcmpic(sender_host_address, da->address) == 0) return CSA_OK; | |
1232 | } | |
1233 | } | |
1234 | ||
1235 | /* If we found some target addresses but none of them matched, the client is | |
1236 | using an unauthorized IP address, otherwise the target has no authorized IP | |
1237 | addresses. */ | |
1238 | ||
1239 | if (target_found) return CSA_FAIL_MISMATCH; | |
1240 | else return CSA_FAIL_NOADDR; | |
1241 | } | |
1242 | ||
1243 | ||
1244 | ||
1245 | /************************************************* | |
1246 | * Verify Client SMTP Authorization * | |
1247 | *************************************************/ | |
1248 | ||
1249 | /* Called from acl_verify() below. This routine calls dns_lookup_special() | |
1250 | to find the CSA SRV record corresponding to the domain argument, or | |
1251 | $sender_helo_name if no argument is provided. It then checks that the | |
1252 | client is authorized, and that its IP address corresponds to the SRV | |
1253 | target's address by calling acl_verify_csa_address() above. The address | |
1254 | should have been returned in the DNS response's ADDITIONAL section, but if | |
1255 | not we perform another DNS lookup to get it. | |
1256 | ||
1257 | Arguments: | |
1258 | domain pointer to optional parameter following verify = csa | |
1259 | ||
1260 | Returns: CSA_UNKNOWN no valid CSA record found | |
1261 | CSA_OK successfully authorized | |
1262 | CSA_FAIL_* client is definitely not authorized | |
1263 | CSA_DEFER_* there was a DNS problem | |
1264 | */ | |
1265 | ||
1266 | static int | |
1267 | acl_verify_csa(uschar *domain) | |
1268 | { | |
1269 | tree_node *t; | |
1270 | uschar *found, *p; | |
1271 | int priority, weight, port; | |
1272 | dns_answer dnsa; | |
1273 | dns_scan dnss; | |
1274 | dns_record *rr; | |
1275 | int rc, type; | |
1276 | uschar target[256]; | |
1277 | ||
1278 | /* Work out the domain we are using for the CSA lookup. The default is the | |
1279 | client's HELO domain. If the client has not said HELO, use its IP address | |
1280 | instead. If it's a local client (exim -bs), CSA isn't applicable. */ | |
1281 | ||
1282 | while (isspace(*domain) && *domain != '\0') ++domain; | |
1283 | if (*domain == '\0') domain = sender_helo_name; | |
1284 | if (domain == NULL) domain = sender_host_address; | |
1285 | if (sender_host_address == NULL) return CSA_UNKNOWN; | |
1286 | ||
1287 | /* If we have an address literal, strip off the framing ready for turning it | |
1288 | into a domain. The framing consists of matched square brackets possibly | |
1289 | containing a keyword and a colon before the actual IP address. */ | |
1290 | ||
1291 | if (domain[0] == '[') | |
1292 | { | |
1293 | uschar *start = Ustrchr(domain, ':'); | |
1294 | if (start == NULL) start = domain; | |
1295 | domain = string_copyn(start + 1, Ustrlen(start) - 2); | |
1296 | } | |
1297 | ||
1298 | /* Turn domains that look like bare IP addresses into domains in the reverse | |
1299 | DNS. This code also deals with address literals and $sender_host_address. It's | |
1300 | not quite kosher to treat bare domains such as EHLO 192.0.2.57 the same as | |
1301 | address literals, but it's probably the most friendly thing to do. This is an | |
1302 | extension to CSA, so we allow it to be turned off for proper conformance. */ | |
1303 | ||
7e66e54d | 1304 | if (string_is_ip_address(domain, NULL) != 0) |
e5a9dba6 PH |
1305 | { |
1306 | if (!dns_csa_use_reverse) return CSA_UNKNOWN; | |
1307 | dns_build_reverse(domain, target); | |
1308 | domain = target; | |
1309 | } | |
1310 | ||
1311 | /* Find out if we've already done the CSA check for this domain. If we have, | |
1312 | return the same result again. Otherwise build a new cached result structure | |
1313 | for this domain. The name is filled in now, and the value is filled in when | |
1314 | we return from this function. */ | |
1315 | ||
1316 | t = tree_search(csa_cache, domain); | |
1317 | if (t != NULL) return t->data.val; | |
1318 | ||
1319 | t = store_get_perm(sizeof(tree_node) + Ustrlen(domain)); | |
1320 | Ustrcpy(t->name, domain); | |
1321 | (void)tree_insertnode(&csa_cache, t); | |
1322 | ||
1323 | /* Now we are ready to do the actual DNS lookup(s). */ | |
1324 | ||
28e6ef29 | 1325 | found = domain; |
e5a9dba6 PH |
1326 | switch (dns_special_lookup(&dnsa, domain, T_CSA, &found)) |
1327 | { | |
1328 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1329 | ||
1330 | default: | |
1331 | return t->data.val = CSA_DEFER_SRV; | |
1332 | ||
1333 | /* If we found nothing, the client's authorization is unknown. */ | |
1334 | ||
1335 | case DNS_NOMATCH: | |
1336 | case DNS_NODATA: | |
1337 | return t->data.val = CSA_UNKNOWN; | |
1338 | ||
1339 | /* We got something! Go on to look at the reply in more detail. */ | |
1340 | ||
1341 | case DNS_SUCCEED: | |
1342 | break; | |
1343 | } | |
1344 | ||
1345 | /* Scan the reply for well-formed CSA SRV records. */ | |
1346 | ||
1347 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
1348 | rr != NULL; | |
1349 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
1350 | { | |
1351 | if (rr->type != T_SRV) continue; | |
1352 | ||
1353 | /* Extract the numerical SRV fields (p is incremented) */ | |
1354 | ||
1355 | p = rr->data; | |
1356 | GETSHORT(priority, p); | |
1357 | GETSHORT(weight, p); | |
1358 | GETSHORT(port, p); | |
1359 | ||
1360 | DEBUG(D_acl) | |
1361 | debug_printf("CSA priority=%d weight=%d port=%d\n", priority, weight, port); | |
1362 | ||
1363 | /* Check the CSA version number */ | |
1364 | ||
1365 | if (priority != 1) continue; | |
1366 | ||
1367 | /* If the domain does not have a CSA SRV record of its own (i.e. the domain | |
1368 | found by dns_special_lookup() is a parent of the one we asked for), we check | |
1369 | the subdomain assertions in the port field. At the moment there's only one | |
1370 | assertion: legitimate SMTP clients are all explicitly authorized with CSA | |
1371 | SRV records of their own. */ | |
1372 | ||
1373 | if (found != domain) | |
1374 | { | |
1375 | if (port & 1) | |
1376 | return t->data.val = CSA_FAIL_EXPLICIT; | |
1377 | else | |
1378 | return t->data.val = CSA_UNKNOWN; | |
1379 | } | |
1380 | ||
1381 | /* This CSA SRV record refers directly to our domain, so we check the value | |
1382 | in the weight field to work out the domain's authorization. 0 and 1 are | |
1383 | unauthorized; 3 means the client is authorized but we can't check the IP | |
1384 | address in order to authenticate it, so we treat it as unknown; values | |
1385 | greater than 3 are undefined. */ | |
1386 | ||
1387 | if (weight < 2) return t->data.val = CSA_FAIL_DOMAIN; | |
1388 | ||
1389 | if (weight > 2) continue; | |
1390 | ||
1391 | /* Weight == 2, which means the domain is authorized. We must check that the | |
1392 | client's IP address is listed as one of the SRV target addresses. Save the | |
1393 | target hostname then break to scan the additional data for its addresses. */ | |
1394 | ||
1395 | (void)dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, | |
1396 | (DN_EXPAND_ARG4_TYPE)target, sizeof(target)); | |
1397 | ||
1398 | DEBUG(D_acl) debug_printf("CSA target is %s\n", target); | |
1399 | ||
1400 | break; | |
1401 | } | |
1402 | ||
1403 | /* If we didn't break the loop then no appropriate records were found. */ | |
1404 | ||
1405 | if (rr == NULL) return t->data.val = CSA_UNKNOWN; | |
1406 | ||
1407 | /* Do not check addresses if the target is ".", in accordance with RFC 2782. | |
1408 | A target of "." indicates there are no valid addresses, so the client cannot | |
1409 | be authorized. (This is an odd configuration because weight=2 target=. is | |
1410 | equivalent to weight=1, but we check for it in order to keep load off the | |
1411 | root name servers.) Note that dn_expand() turns "." into "". */ | |
1412 | ||
1413 | if (Ustrcmp(target, "") == 0) return t->data.val = CSA_FAIL_NOADDR; | |
1414 | ||
1415 | /* Scan the additional section of the CSA SRV reply for addresses belonging | |
1416 | to the target. If the name server didn't return any additional data (e.g. | |
1417 | because it does not fully support SRV records), we need to do another lookup | |
1418 | to obtain the target addresses; otherwise we have a definitive result. */ | |
1419 | ||
1420 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ADDITIONAL, target); | |
1421 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1422 | ||
1423 | /* The DNS lookup type corresponds to the IP version used by the client. */ | |
1424 | ||
1425 | #if HAVE_IPV6 | |
1426 | if (Ustrchr(sender_host_address, ':') != NULL) | |
1427 | type = T_AAAA; | |
1428 | else | |
1429 | #endif /* HAVE_IPV6 */ | |
1430 | type = T_A; | |
1431 | ||
1432 | ||
1433 | #if HAVE_IPV6 && defined(SUPPORT_A6) | |
1434 | DNS_LOOKUP_AGAIN: | |
1435 | #endif | |
1436 | ||
1437 | switch (dns_lookup(&dnsa, target, type, NULL)) | |
1438 | { | |
1439 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1440 | ||
1441 | default: | |
1442 | return t->data.val = CSA_DEFER_ADDR; | |
1443 | ||
1444 | /* If the query succeeded, scan the addresses and return the result. */ | |
1445 | ||
1446 | case DNS_SUCCEED: | |
1447 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ANSWERS, target); | |
1448 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1449 | /* else fall through */ | |
1450 | ||
1451 | /* If the target has no IP addresses, the client cannot have an authorized | |
1452 | IP address. However, if the target site uses A6 records (not AAAA records) | |
1453 | we have to do yet another lookup in order to check them. */ | |
1454 | ||
1455 | case DNS_NOMATCH: | |
1456 | case DNS_NODATA: | |
1457 | ||
1458 | #if HAVE_IPV6 && defined(SUPPORT_A6) | |
1459 | if (type == T_AAAA) { type = T_A6; goto DNS_LOOKUP_AGAIN; } | |
1460 | #endif | |
1461 | ||
1462 | return t->data.val = CSA_FAIL_NOADDR; | |
1463 | } | |
1464 | } | |
1465 | ||
1466 | ||
1467 | ||
059ec3d9 PH |
1468 | /************************************************* |
1469 | * Handle verification (address & other) * | |
1470 | *************************************************/ | |
1471 | ||
1472 | /* This function implements the "verify" condition. It is called when | |
1473 | encountered in any ACL, because some tests are almost always permitted. Some | |
1474 | just don't make sense, and always fail (for example, an attempt to test a host | |
1475 | lookup for a non-TCP/IP message). Others are restricted to certain ACLs. | |
1476 | ||
1477 | Arguments: | |
1478 | where where called from | |
1479 | addr the recipient address that the ACL is handling, or NULL | |
1480 | arg the argument of "verify" | |
1481 | user_msgptr pointer for user message | |
1482 | log_msgptr pointer for log message | |
1483 | basic_errno where to put verify errno | |
1484 | ||
1485 | Returns: OK verification condition succeeded | |
1486 | FAIL verification failed | |
1487 | DEFER there was a problem verifying | |
1488 | ERROR syntax error | |
1489 | */ | |
1490 | ||
1491 | static int | |
1492 | acl_verify(int where, address_item *addr, uschar *arg, | |
1493 | uschar **user_msgptr, uschar **log_msgptr, int *basic_errno) | |
1494 | { | |
1495 | int sep = '/'; | |
1496 | int callout = -1; | |
1497 | int callout_overall = -1; | |
4deaf07d | 1498 | int callout_connect = -1; |
059ec3d9 PH |
1499 | int verify_options = 0; |
1500 | int rc; | |
1501 | BOOL verify_header_sender = FALSE; | |
1502 | BOOL defer_ok = FALSE; | |
1503 | BOOL callout_defer_ok = FALSE; | |
1504 | BOOL no_details = FALSE; | |
eafd343b | 1505 | BOOL success_on_redirect = FALSE; |
059ec3d9 PH |
1506 | address_item *sender_vaddr = NULL; |
1507 | uschar *verify_sender_address = NULL; | |
1508 | uschar *pm_mailfrom = NULL; | |
1509 | uschar *se_mailfrom = NULL; | |
596875b3 PH |
1510 | |
1511 | /* Some of the verify items have slash-separated options; some do not. Diagnose | |
1512 | an error if options are given for items that don't expect them. This code has | |
1513 | now got very message. Refactoring to use a table would be a good idea one day. | |
1514 | */ | |
1515 | ||
1516 | uschar *slash = Ustrchr(arg, '/'); | |
059ec3d9 PH |
1517 | uschar *list = arg; |
1518 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
1519 | ||
1520 | if (ss == NULL) goto BAD_VERIFY; | |
1521 | ||
1522 | /* Handle name/address consistency verification in a separate function. */ | |
1523 | ||
1524 | if (strcmpic(ss, US"reverse_host_lookup") == 0) | |
1525 | { | |
596875b3 | 1526 | if (slash != NULL) goto NO_OPTIONS; |
059ec3d9 PH |
1527 | if (sender_host_address == NULL) return OK; |
1528 | return acl_verify_reverse(user_msgptr, log_msgptr); | |
1529 | } | |
1530 | ||
1531 | /* TLS certificate verification is done at STARTTLS time; here we just | |
1532 | test whether it was successful or not. (This is for optional verification; for | |
1533 | mandatory verification, the connection doesn't last this long.) */ | |
1534 | ||
1535 | if (strcmpic(ss, US"certificate") == 0) | |
1536 | { | |
596875b3 | 1537 | if (slash != NULL) goto NO_OPTIONS; |
059ec3d9 PH |
1538 | if (tls_certificate_verified) return OK; |
1539 | *user_msgptr = US"no verified certificate"; | |
1540 | return FAIL; | |
1541 | } | |
1542 | ||
d7b47fd0 PH |
1543 | /* We can test the result of optional HELO verification that might have |
1544 | occurred earlier. If not, we can attempt the verification now. */ | |
059ec3d9 | 1545 | |
596875b3 PH |
1546 | if (strcmpic(ss, US"helo") == 0) |
1547 | { | |
1548 | if (slash != NULL) goto NO_OPTIONS; | |
0154e85a TF |
1549 | if (!helo_verified && !helo_verify_failed) smtp_verify_helo(); |
1550 | return helo_verified? OK : FAIL; | |
596875b3 | 1551 | } |
059ec3d9 | 1552 | |
e5a9dba6 PH |
1553 | /* Do Client SMTP Authorization checks in a separate function, and turn the |
1554 | result code into user-friendly strings. */ | |
1555 | ||
1556 | if (strcmpic(ss, US"csa") == 0) | |
1557 | { | |
1558 | rc = acl_verify_csa(list); | |
1559 | *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s", | |
1560 | csa_reason_string[rc]); | |
1561 | csa_status = csa_status_string[rc]; | |
1562 | DEBUG(D_acl) debug_printf("CSA result %s\n", csa_status); | |
1563 | return csa_return_code[rc]; | |
1564 | } | |
1565 | ||
596875b3 PH |
1566 | /* Check that all relevant header lines have the correct syntax. If there is |
1567 | a syntax error, we return details of the error to the sender if configured to | |
1568 | send out full details. (But a "message" setting on the ACL can override, as | |
1569 | always). */ | |
059ec3d9 | 1570 | |
596875b3 | 1571 | if (strcmpic(ss, US"header_syntax") == 0) |
059ec3d9 | 1572 | { |
596875b3 | 1573 | if (slash != NULL) goto NO_OPTIONS; |
1c41c9cc | 1574 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; |
596875b3 PH |
1575 | rc = verify_check_headers(log_msgptr); |
1576 | if (rc != OK && smtp_return_error_details && *log_msgptr != NULL) | |
1577 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1578 | return rc; | |
1579 | } | |
059ec3d9 | 1580 | |
1c41c9cc PH |
1581 | /* Check that no recipient of this message is "blind", that is, every envelope |
1582 | recipient must be mentioned in either To: or Cc:. */ | |
1583 | ||
1584 | if (strcmpic(ss, US"not_blind") == 0) | |
1585 | { | |
1586 | if (slash != NULL) goto NO_OPTIONS; | |
1587 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; | |
1588 | rc = verify_check_notblind(); | |
1589 | if (rc != OK) | |
1590 | { | |
1591 | *log_msgptr = string_sprintf("bcc recipient detected"); | |
1592 | if (smtp_return_error_details) | |
1593 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1594 | } | |
1595 | return rc; | |
1596 | } | |
059ec3d9 | 1597 | |
596875b3 PH |
1598 | /* The remaining verification tests check recipient and sender addresses, |
1599 | either from the envelope or from the header. There are a number of | |
1600 | slash-separated options that are common to all of them. */ | |
059ec3d9 | 1601 | |
059ec3d9 | 1602 | |
596875b3 PH |
1603 | /* Check that there is at least one verifiable sender address in the relevant |
1604 | header lines. This can be followed by callout and defer options, just like | |
1605 | sender and recipient. */ | |
059ec3d9 | 1606 | |
596875b3 PH |
1607 | if (strcmpic(ss, US"header_sender") == 0) |
1608 | { | |
1c41c9cc | 1609 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; |
596875b3 | 1610 | verify_header_sender = TRUE; |
059ec3d9 PH |
1611 | } |
1612 | ||
1613 | /* Otherwise, first item in verify argument must be "sender" or "recipient". | |
1614 | In the case of a sender, this can optionally be followed by an address to use | |
1615 | in place of the actual sender (rare special-case requirement). */ | |
1616 | ||
1617 | else if (strncmpic(ss, US"sender", 6) == 0) | |
1618 | { | |
1619 | uschar *s = ss + 6; | |
1620 | if (where > ACL_WHERE_NOTSMTP) | |
1621 | { | |
1622 | *log_msgptr = string_sprintf("cannot verify sender in ACL for %s " | |
1623 | "(only possible for MAIL, RCPT, PREDATA, or DATA)", | |
1624 | acl_wherenames[where]); | |
1625 | return ERROR; | |
1626 | } | |
1627 | if (*s == 0) | |
1628 | verify_sender_address = sender_address; | |
1629 | else | |
1630 | { | |
1631 | while (isspace(*s)) s++; | |
1632 | if (*s++ != '=') goto BAD_VERIFY; | |
1633 | while (isspace(*s)) s++; | |
1634 | verify_sender_address = string_copy(s); | |
1635 | } | |
1636 | } | |
1637 | else | |
1638 | { | |
1639 | if (strcmpic(ss, US"recipient") != 0) goto BAD_VERIFY; | |
1640 | if (addr == NULL) | |
1641 | { | |
1642 | *log_msgptr = string_sprintf("cannot verify recipient in ACL for %s " | |
1643 | "(only possible for RCPT)", acl_wherenames[where]); | |
1644 | return ERROR; | |
1645 | } | |
1646 | } | |
1647 | ||
596875b3 PH |
1648 | /* Remaining items are optional; they apply to sender and recipient |
1649 | verification, including "header sender" verification. */ | |
059ec3d9 PH |
1650 | |
1651 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) | |
1652 | != NULL) | |
1653 | { | |
1654 | if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE; | |
1655 | else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE; | |
eafd343b | 1656 | else if (strcmpic(ss, US"success_on_redirect") == 0) success_on_redirect = TRUE; |
059ec3d9 PH |
1657 | |
1658 | /* These two old options are left for backwards compatibility */ | |
1659 | ||
1660 | else if (strcmpic(ss, US"callout_defer_ok") == 0) | |
1661 | { | |
1662 | callout_defer_ok = TRUE; | |
1663 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1664 | } | |
1665 | ||
1666 | else if (strcmpic(ss, US"check_postmaster") == 0) | |
1667 | { | |
1668 | pm_mailfrom = US""; | |
1669 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1670 | } | |
1671 | ||
1672 | /* The callout option has a number of sub-options, comma separated */ | |
1673 | ||
1674 | else if (strncmpic(ss, US"callout", 7) == 0) | |
1675 | { | |
1676 | callout = CALLOUT_TIMEOUT_DEFAULT; | |
1677 | ss += 7; | |
1678 | if (*ss != 0) | |
1679 | { | |
1680 | while (isspace(*ss)) ss++; | |
1681 | if (*ss++ == '=') | |
1682 | { | |
1683 | int optsep = ','; | |
1684 | uschar *opt; | |
1685 | uschar buffer[256]; | |
1686 | while (isspace(*ss)) ss++; | |
8e669ac1 PH |
1687 | |
1688 | /* This callout option handling code has become a mess as new options | |
1689 | have been added in an ad hoc manner. It should be tidied up into some | |
4deaf07d | 1690 | kind of table-driven thing. */ |
8e669ac1 | 1691 | |
059ec3d9 PH |
1692 | while ((opt = string_nextinlist(&ss, &optsep, buffer, sizeof(buffer))) |
1693 | != NULL) | |
1694 | { | |
1695 | if (strcmpic(opt, US"defer_ok") == 0) callout_defer_ok = TRUE; | |
1696 | else if (strcmpic(opt, US"no_cache") == 0) | |
1697 | verify_options |= vopt_callout_no_cache; | |
1698 | else if (strcmpic(opt, US"random") == 0) | |
1699 | verify_options |= vopt_callout_random; | |
1700 | else if (strcmpic(opt, US"use_sender") == 0) | |
1701 | verify_options |= vopt_callout_recipsender; | |
1702 | else if (strcmpic(opt, US"use_postmaster") == 0) | |
1703 | verify_options |= vopt_callout_recippmaster; | |
1704 | else if (strcmpic(opt, US"postmaster") == 0) pm_mailfrom = US""; | |
2a4be8f9 PH |
1705 | else if (strcmpic(opt, US"fullpostmaster") == 0) |
1706 | { | |
1707 | pm_mailfrom = US""; | |
1708 | verify_options |= vopt_callout_fullpm; | |
1709 | } | |
059ec3d9 PH |
1710 | |
1711 | else if (strncmpic(opt, US"mailfrom", 8) == 0) | |
1712 | { | |
1713 | if (!verify_header_sender) | |
1714 | { | |
1715 | *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a " | |
1716 | "callout option only for verify=header_sender (detected in ACL " | |
1717 | "condition \"%s\")", arg); | |
1718 | return ERROR; | |
1719 | } | |
1720 | opt += 8; | |
1721 | while (isspace(*opt)) opt++; | |
1722 | if (*opt++ != '=') | |
1723 | { | |
1724 | *log_msgptr = string_sprintf("'=' expected after " | |
1725 | "\"mailfrom\" in ACL condition \"%s\"", arg); | |
1726 | return ERROR; | |
1727 | } | |
1728 | while (isspace(*opt)) opt++; | |
1729 | se_mailfrom = string_copy(opt); | |
1730 | } | |
1731 | ||
1732 | else if (strncmpic(opt, US"postmaster_mailfrom", 19) == 0) | |
1733 | { | |
1734 | opt += 19; | |
1735 | while (isspace(*opt)) opt++; | |
1736 | if (*opt++ != '=') | |
1737 | { | |
1738 | *log_msgptr = string_sprintf("'=' expected after " | |
1739 | "\"postmaster_mailfrom\" in ACL condition \"%s\"", arg); | |
1740 | return ERROR; | |
1741 | } | |
1742 | while (isspace(*opt)) opt++; | |
1743 | pm_mailfrom = string_copy(opt); | |
1744 | } | |
1745 | ||
1746 | else if (strncmpic(opt, US"maxwait", 7) == 0) | |
1747 | { | |
1748 | opt += 7; | |
1749 | while (isspace(*opt)) opt++; | |
1750 | if (*opt++ != '=') | |
1751 | { | |
1752 | *log_msgptr = string_sprintf("'=' expected after \"maxwait\" in " | |
1753 | "ACL condition \"%s\"", arg); | |
1754 | return ERROR; | |
1755 | } | |
1756 | while (isspace(*opt)) opt++; | |
1757 | callout_overall = readconf_readtime(opt, 0, FALSE); | |
1758 | if (callout_overall < 0) | |
1759 | { | |
1760 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1761 | "\"verify %s\"", arg); | |
1762 | return ERROR; | |
1763 | } | |
1764 | } | |
4deaf07d PH |
1765 | else if (strncmpic(opt, US"connect", 7) == 0) |
1766 | { | |
1767 | opt += 7; | |
1768 | while (isspace(*opt)) opt++; | |
1769 | if (*opt++ != '=') | |
1770 | { | |
1771 | *log_msgptr = string_sprintf("'=' expected after " | |
1772 | "\"callout_overaall\" in ACL condition \"%s\"", arg); | |
1773 | return ERROR; | |
1774 | } | |
1775 | while (isspace(*opt)) opt++; | |
1776 | callout_connect = readconf_readtime(opt, 0, FALSE); | |
1777 | if (callout_connect < 0) | |
1778 | { | |
1779 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1780 | "\"verify %s\"", arg); | |
1781 | return ERROR; | |
1782 | } | |
1783 | } | |
059ec3d9 PH |
1784 | else /* Plain time is callout connect/command timeout */ |
1785 | { | |
1786 | callout = readconf_readtime(opt, 0, FALSE); | |
1787 | if (callout < 0) | |
1788 | { | |
1789 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1790 | "\"verify %s\"", arg); | |
1791 | return ERROR; | |
1792 | } | |
1793 | } | |
1794 | } | |
1795 | } | |
1796 | else | |
1797 | { | |
1798 | *log_msgptr = string_sprintf("'=' expected after \"callout\" in " | |
1799 | "ACL condition \"%s\"", arg); | |
1800 | return ERROR; | |
1801 | } | |
1802 | } | |
1803 | } | |
1804 | ||
1805 | /* Option not recognized */ | |
1806 | ||
1807 | else | |
1808 | { | |
1809 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " | |
1810 | "condition \"verify %s\"", ss, arg); | |
1811 | return ERROR; | |
1812 | } | |
1813 | } | |
1814 | ||
1815 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == | |
1816 | (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1817 | { | |
1818 | *log_msgptr = US"only one of use_sender and use_postmaster can be set " | |
1819 | "for a recipient callout"; | |
1820 | return ERROR; | |
1821 | } | |
1822 | ||
1823 | /* Handle sender-in-header verification. Default the user message to the log | |
1824 | message if giving out verification details. */ | |
1825 | ||
1826 | if (verify_header_sender) | |
1827 | { | |
8e669ac1 | 1828 | int verrno; |
059ec3d9 | 1829 | rc = verify_check_header_address(user_msgptr, log_msgptr, callout, |
fe5b5d0b PH |
1830 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, verify_options, |
1831 | &verrno); | |
1832 | if (rc != OK) | |
8e669ac1 | 1833 | { |
fe5b5d0b PH |
1834 | *basic_errno = verrno; |
1835 | if (smtp_return_error_details) | |
1836 | { | |
1837 | if (*user_msgptr == NULL && *log_msgptr != NULL) | |
1838 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1839 | if (rc == DEFER) acl_temp_details = TRUE; | |
1840 | } | |
8e669ac1 | 1841 | } |
059ec3d9 PH |
1842 | } |
1843 | ||
1844 | /* Handle a sender address. The default is to verify *the* sender address, but | |
1845 | optionally a different address can be given, for special requirements. If the | |
1846 | address is empty, we are dealing with a bounce message that has no sender, so | |
1847 | we cannot do any checking. If the real sender address gets rewritten during | |
1848 | verification (e.g. DNS widening), set the flag to stop it being rewritten again | |
1849 | during message reception. | |
1850 | ||
1851 | A list of verified "sender" addresses is kept to try to avoid doing to much | |
1852 | work repetitively when there are multiple recipients in a message and they all | |
1853 | require sender verification. However, when callouts are involved, it gets too | |
1854 | complicated because different recipients may require different callout options. | |
1855 | Therefore, we always do a full sender verify when any kind of callout is | |
1856 | specified. Caching elsewhere, for instance in the DNS resolver and in the | |
1857 | callout handling, should ensure that this is not terribly inefficient. */ | |
1858 | ||
1859 | else if (verify_sender_address != NULL) | |
1860 | { | |
1861 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1862 | != 0) | |
1863 | { | |
1864 | *log_msgptr = US"use_sender or use_postmaster cannot be used for a " | |
1865 | "sender verify callout"; | |
1866 | return ERROR; | |
1867 | } | |
1868 | ||
1869 | sender_vaddr = verify_checked_sender(verify_sender_address); | |
1870 | if (sender_vaddr != NULL && /* Previously checked */ | |
1871 | callout <= 0) /* No callout needed this time */ | |
1872 | { | |
1873 | /* If the "routed" flag is set, it means that routing worked before, so | |
1874 | this check can give OK (the saved return code value, if set, belongs to a | |
1875 | callout that was done previously). If the "routed" flag is not set, routing | |
1876 | must have failed, so we use the saved return code. */ | |
1877 | ||
1878 | if (testflag(sender_vaddr, af_verify_routed)) rc = OK; else | |
1879 | { | |
1880 | rc = sender_vaddr->special_action; | |
1881 | *basic_errno = sender_vaddr->basic_errno; | |
1882 | } | |
1883 | HDEBUG(D_acl) debug_printf("using cached sender verify result\n"); | |
1884 | } | |
1885 | ||
1886 | /* Do a new verification, and cache the result. The cache is used to avoid | |
1887 | verifying the sender multiple times for multiple RCPTs when callouts are not | |
1888 | specified (see comments above). | |
1889 | ||
1890 | The cache is also used on failure to give details in response to the first | |
1891 | RCPT that gets bounced for this reason. However, this can be suppressed by | |
1892 | the no_details option, which sets the flag that says "this detail has already | |
1893 | been sent". The cache normally contains just one address, but there may be | |
1894 | more in esoteric circumstances. */ | |
1895 | ||
1896 | else | |
1897 | { | |
1898 | BOOL routed = TRUE; | |
2a3eea10 | 1899 | uschar *save_address_data = deliver_address_data; |
8e669ac1 | 1900 | |
059ec3d9 PH |
1901 | sender_vaddr = deliver_make_addr(verify_sender_address, TRUE); |
1902 | if (no_details) setflag(sender_vaddr, af_sverify_told); | |
1903 | if (verify_sender_address[0] != 0) | |
1904 | { | |
1905 | /* If this is the real sender address, save the unrewritten version | |
1906 | for use later in receive. Otherwise, set a flag so that rewriting the | |
1907 | sender in verify_address() does not update sender_address. */ | |
1908 | ||
1909 | if (verify_sender_address == sender_address) | |
1910 | sender_address_unrewritten = sender_address; | |
1911 | else | |
1912 | verify_options |= vopt_fake_sender; | |
1913 | ||
eafd343b TK |
1914 | if (success_on_redirect) |
1915 | verify_options |= vopt_success_on_redirect; | |
1916 | ||
059ec3d9 PH |
1917 | /* The recipient, qualify, and expn options are never set in |
1918 | verify_options. */ | |
1919 | ||
1920 | rc = verify_address(sender_vaddr, NULL, verify_options, callout, | |
4deaf07d | 1921 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, &routed); |
059ec3d9 PH |
1922 | |
1923 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); | |
1924 | ||
1925 | if (rc == OK) | |
1926 | { | |
1927 | if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0) | |
1928 | { | |
1929 | DEBUG(D_acl) debug_printf("sender %s verified ok as %s\n", | |
1930 | verify_sender_address, sender_vaddr->address); | |
1931 | } | |
1932 | else | |
1933 | { | |
1934 | DEBUG(D_acl) debug_printf("sender %s verified ok\n", | |
1935 | verify_sender_address); | |
1936 | } | |
1937 | } | |
1938 | else *basic_errno = sender_vaddr->basic_errno; | |
1939 | } | |
1940 | else rc = OK; /* Null sender */ | |
1941 | ||
1942 | /* Cache the result code */ | |
1943 | ||
1944 | if (routed) setflag(sender_vaddr, af_verify_routed); | |
1945 | if (callout > 0) setflag(sender_vaddr, af_verify_callout); | |
1946 | sender_vaddr->special_action = rc; | |
1947 | sender_vaddr->next = sender_verified_list; | |
1948 | sender_verified_list = sender_vaddr; | |
8e669ac1 PH |
1949 | |
1950 | /* Restore the recipient address data, which might have been clobbered by | |
2a3eea10 | 1951 | the sender verification. */ |
8e669ac1 | 1952 | |
2a3eea10 | 1953 | deliver_address_data = save_address_data; |
059ec3d9 | 1954 | } |
8e669ac1 | 1955 | |
2a3eea10 PH |
1956 | /* Put the sender address_data value into $sender_address_data */ |
1957 | ||
8e669ac1 | 1958 | sender_address_data = sender_vaddr->p.address_data; |
059ec3d9 PH |
1959 | } |
1960 | ||
1961 | /* A recipient address just gets a straightforward verify; again we must handle | |
1962 | the DEFER overrides. */ | |
1963 | ||
1964 | else | |
1965 | { | |
1966 | address_item addr2; | |
1967 | ||
eafd343b TK |
1968 | if (success_on_redirect) |
1969 | verify_options |= vopt_success_on_redirect; | |
1970 | ||
059ec3d9 PH |
1971 | /* We must use a copy of the address for verification, because it might |
1972 | get rewritten. */ | |
1973 | ||
1974 | addr2 = *addr; | |
1975 | rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout, | |
4deaf07d | 1976 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, NULL); |
059ec3d9 | 1977 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); |
8e669ac1 | 1978 | |
42855d71 | 1979 | *basic_errno = addr2.basic_errno; |
059ec3d9 | 1980 | *log_msgptr = addr2.message; |
8e669ac1 | 1981 | *user_msgptr = (addr2.user_message != NULL)? |
6729cf78 | 1982 | addr2.user_message : addr2.message; |
42855d71 PH |
1983 | |
1984 | /* Allow details for temporary error if the address is so flagged. */ | |
1985 | if (testflag((&addr2), af_pass_message)) acl_temp_details = TRUE; | |
059ec3d9 PH |
1986 | |
1987 | /* Make $address_data visible */ | |
1988 | deliver_address_data = addr2.p.address_data; | |
1989 | } | |
1990 | ||
1991 | /* We have a result from the relevant test. Handle defer overrides first. */ | |
1992 | ||
1993 | if (rc == DEFER && (defer_ok || | |
1994 | (callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER))) | |
1995 | { | |
1996 | HDEBUG(D_acl) debug_printf("verify defer overridden by %s\n", | |
1997 | defer_ok? "defer_ok" : "callout_defer_ok"); | |
1998 | rc = OK; | |
1999 | } | |
2000 | ||
2001 | /* If we've failed a sender, set up a recipient message, and point | |
2002 | sender_verified_failed to the address item that actually failed. */ | |
2003 | ||
2004 | if (rc != OK && verify_sender_address != NULL) | |
2005 | { | |
2006 | if (rc != DEFER) | |
2007 | { | |
2008 | *log_msgptr = *user_msgptr = US"Sender verify failed"; | |
2009 | } | |
2010 | else if (*basic_errno != ERRNO_CALLOUTDEFER) | |
2011 | { | |
2012 | *log_msgptr = *user_msgptr = US"Could not complete sender verify"; | |
2013 | } | |
2014 | else | |
2015 | { | |
2016 | *log_msgptr = US"Could not complete sender verify callout"; | |
2017 | *user_msgptr = smtp_return_error_details? sender_vaddr->user_message : | |
2018 | *log_msgptr; | |
2019 | } | |
2020 | ||
2021 | sender_verified_failed = sender_vaddr; | |
2022 | } | |
2023 | ||
2024 | /* Verifying an address messes up the values of $domain and $local_part, | |
2025 | so reset them before returning if this is a RCPT ACL. */ | |
2026 | ||
2027 | if (addr != NULL) | |
2028 | { | |
2029 | deliver_domain = addr->domain; | |
2030 | deliver_localpart = addr->local_part; | |
2031 | } | |
2032 | return rc; | |
2033 | ||
2034 | /* Syntax errors in the verify argument come here. */ | |
2035 | ||
2036 | BAD_VERIFY: | |
2037 | *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", " | |
596875b3 PH |
2038 | "\"helo\", \"header_syntax\", \"header_sender\" or " |
2039 | "\"reverse_host_lookup\" at start of ACL condition " | |
059ec3d9 PH |
2040 | "\"verify %s\"", arg); |
2041 | return ERROR; | |
596875b3 PH |
2042 | |
2043 | /* Options supplied when not allowed come here */ | |
2044 | ||
2045 | NO_OPTIONS: | |
2046 | *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" " | |
2047 | "(this verify item has no options)", arg); | |
2048 | return ERROR; | |
1c41c9cc PH |
2049 | |
2050 | /* Calls in the wrong ACL come here */ | |
2051 | ||
2052 | WRONG_ACL: | |
2053 | *log_msgptr = string_sprintf("cannot check header contents in ACL for %s " | |
2054 | "(only possible in ACL for DATA)", acl_wherenames[where]); | |
2055 | return ERROR; | |
059ec3d9 PH |
2056 | } |
2057 | ||
2058 | ||
2059 | ||
2060 | ||
2061 | /************************************************* | |
2062 | * Check argument for control= modifier * | |
2063 | *************************************************/ | |
2064 | ||
2065 | /* Called from acl_check_condition() below | |
2066 | ||
2067 | Arguments: | |
2068 | arg the argument string for control= | |
2069 | pptr set to point to the terminating character | |
2070 | where which ACL we are in | |
2071 | log_msgptr for error messages | |
2072 | ||
2073 | Returns: CONTROL_xxx value | |
2074 | */ | |
2075 | ||
2076 | static int | |
2077 | decode_control(uschar *arg, uschar **pptr, int where, uschar **log_msgptr) | |
2078 | { | |
2079 | int len; | |
2080 | control_def *d; | |
2081 | ||
2082 | for (d = controls_list; | |
2083 | d < controls_list + sizeof(controls_list)/sizeof(control_def); | |
2084 | d++) | |
2085 | { | |
2086 | len = Ustrlen(d->name); | |
2087 | if (Ustrncmp(d->name, arg, len) == 0) break; | |
2088 | } | |
2089 | ||
2090 | if (d >= controls_list + sizeof(controls_list)/sizeof(control_def) || | |
2091 | (arg[len] != 0 && (!d->has_option || arg[len] != '/'))) | |
2092 | { | |
2093 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2094 | return CONTROL_ERROR; | |
2095 | } | |
2096 | ||
059ec3d9 PH |
2097 | *pptr = arg + len; |
2098 | return d->value; | |
2099 | } | |
2100 | ||
2101 | ||
2102 | ||
870f6ba8 TF |
2103 | /************************************************* |
2104 | * Handle rate limiting * | |
2105 | *************************************************/ | |
2106 | ||
2107 | /* Called by acl_check_condition() below to calculate the result | |
2108 | of the ACL ratelimit condition. | |
2109 | ||
2110 | Note that the return value might be slightly unexpected: if the | |
2111 | sender's rate is above the limit then the result is OK. This is | |
2112 | similar to the dnslists condition, and is so that you can write | |
2113 | ACL clauses like: defer ratelimit = 15 / 1h | |
2114 | ||
2115 | Arguments: | |
2116 | arg the option string for ratelimit= | |
90fc3069 | 2117 | where ACL_WHERE_xxxx indicating which ACL this is |
870f6ba8 TF |
2118 | log_msgptr for error messages |
2119 | ||
2120 | Returns: OK - Sender's rate is above limit | |
2121 | FAIL - Sender's rate is below limit | |
2122 | DEFER - Problem opening ratelimit database | |
2123 | ERROR - Syntax error in options. | |
2124 | */ | |
2125 | ||
2126 | static int | |
90fc3069 | 2127 | acl_ratelimit(uschar *arg, int where, uschar **log_msgptr) |
870f6ba8 TF |
2128 | { |
2129 | double limit, period; | |
f3dcf4a2 | 2130 | uschar *ss, *key; |
870f6ba8 TF |
2131 | int sep = '/'; |
2132 | BOOL have_key = FALSE, leaky = FALSE, strict = FALSE; | |
2133 | BOOL per_byte = FALSE, per_cmd = FALSE, per_conn = FALSE, per_mail = FALSE; | |
2134 | int old_pool, rc; | |
2135 | tree_node **anchor, *t; | |
2136 | open_db dbblock, *dbm; | |
2137 | dbdata_ratelimit *dbd; | |
2138 | struct timeval tv; | |
2139 | ||
2140 | /* Parse the first two options and record their values in expansion | |
2141 | variables. These variables allow the configuration to have informative | |
2142 | error messages based on rate limits obtained from a table lookup. */ | |
2143 | ||
2144 | /* First is the maximum number of messages per period and maximum burst | |
2145 | size, which must be greater than or equal to zero. Zero is useful for | |
2146 | rate measurement as opposed to rate limiting. */ | |
2147 | ||
2148 | sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0); | |
2149 | if (sender_rate_limit == NULL) | |
2150 | limit = -1.0; | |
2151 | else | |
2152 | { | |
2153 | limit = Ustrtod(sender_rate_limit, &ss); | |
2154 | if (tolower(*ss) == 'k') { limit *= 1024.0; ss++; } | |
2155 | else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; } | |
2156 | else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; } | |
2157 | } | |
2158 | if (limit < 0.0 || *ss != 0) | |
2159 | { | |
2160 | *log_msgptr = string_sprintf("syntax error in argument for " | |
2161 | "\"ratelimit\" condition: \"%s\" is not a positive number", | |
2162 | sender_rate_limit); | |
2163 | return ERROR; | |
2164 | } | |
2165 | ||
f3dcf4a2 TF |
2166 | /* We use the rest of the argument list following the limit as the |
2167 | lookup key, because it doesn't make sense to use the same stored data | |
2168 | if the period or options are different. */ | |
2169 | ||
2170 | key = arg; | |
2171 | ||
870f6ba8 TF |
2172 | /* Second is the rate measurement period and exponential smoothing time |
2173 | constant. This must be strictly greater than zero, because zero leads to | |
2174 | run-time division errors. */ | |
2175 | ||
2176 | sender_rate_period = string_nextinlist(&arg, &sep, NULL, 0); | |
2177 | if (sender_rate_period == NULL) period = -1.0; | |
2178 | else period = readconf_readtime(sender_rate_period, 0, FALSE); | |
2179 | if (period <= 0.0) | |
2180 | { | |
2181 | *log_msgptr = string_sprintf("syntax error in argument for " | |
2182 | "\"ratelimit\" condition: \"%s\" is not a time value", | |
2183 | sender_rate_period); | |
2184 | return ERROR; | |
2185 | } | |
2186 | ||
2187 | /* Parse the other options. Should we check if the per_* options are being | |
2188 | used in ACLs where they don't make sense, e.g. per_mail in the connect ACL? */ | |
2189 | ||
2190 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2191 | != NULL) | |
2192 | { | |
2193 | if (strcmpic(ss, US"leaky") == 0) leaky = TRUE; | |
2194 | else if (strcmpic(ss, US"strict") == 0) strict = TRUE; | |
2195 | else if (strcmpic(ss, US"per_byte") == 0) per_byte = TRUE; | |
2196 | else if (strcmpic(ss, US"per_cmd") == 0) per_cmd = TRUE; | |
2197 | else if (strcmpic(ss, US"per_conn") == 0) per_conn = TRUE; | |
2198 | else if (strcmpic(ss, US"per_mail") == 0) per_mail = TRUE; | |
2199 | else if (strcmpic(ss, US"per_rcpt") == 0) per_cmd = TRUE; /* alias */ | |
2200 | else have_key = TRUE; | |
2201 | } | |
2202 | if (leaky + strict > 1 || per_byte + per_cmd + per_conn + per_mail > 1) | |
2203 | { | |
2204 | *log_msgptr = US"conflicting options for \"ratelimit\" condition"; | |
2205 | return ERROR; | |
2206 | } | |
2207 | ||
2208 | /* Default option values */ | |
2209 | if (!strict) leaky = TRUE; | |
2210 | if (!per_byte && !per_cmd && !per_conn) per_mail = TRUE; | |
2211 | ||
f3dcf4a2 | 2212 | /* If there is no explicit key, use the sender_host_address. If there is no |
870f6ba8 TF |
2213 | sender_host_address (e.g. -bs or acl_not_smtp) then we simply omit it. */ |
2214 | ||
2215 | if (!have_key && sender_host_address != NULL) | |
2216 | key = string_sprintf("%s / %s", key, sender_host_address); | |
2217 | ||
2218 | HDEBUG(D_acl) debug_printf("ratelimit condition limit=%.0f period=%.0f key=%s\n", | |
2219 | limit, period, key); | |
2220 | ||
fe0dab11 | 2221 | /* See if we have already computed the rate by looking in the relevant tree. For |
870f6ba8 TF |
2222 | per-connection rate limiting, store tree nodes and dbdata in the permanent pool |
2223 | so that they survive across resets. */ | |
2224 | ||
2225 | anchor = NULL; | |
2226 | old_pool = store_pool; | |
2227 | ||
2228 | if (per_conn) | |
2229 | { | |
2230 | anchor = &ratelimiters_conn; | |
2231 | store_pool = POOL_PERM; | |
2232 | } | |
fe0dab11 | 2233 | else if (per_mail || per_byte) |
870f6ba8 | 2234 | anchor = &ratelimiters_mail; |
fe0dab11 TF |
2235 | else if (per_cmd) |
2236 | anchor = &ratelimiters_cmd; | |
870f6ba8 TF |
2237 | |
2238 | if (anchor != NULL && (t = tree_search(*anchor, key)) != NULL) | |
2239 | { | |
2240 | dbd = t->data.ptr; | |
2241 | /* The following few lines duplicate some of the code below. */ | |
3348576f TF |
2242 | if (dbd->rate < limit) rc = FAIL; |
2243 | else rc = OK; | |
870f6ba8 TF |
2244 | store_pool = old_pool; |
2245 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2246 | HDEBUG(D_acl) | |
2247 | debug_printf("ratelimit found pre-computed rate %s\n", sender_rate); | |
2248 | return rc; | |
2249 | } | |
2250 | ||
2251 | /* We aren't using a pre-computed rate, so get a previously recorded | |
2252 | rate from the database, update it, and write it back. If there's no | |
2253 | previous rate for this key, create one. */ | |
2254 | ||
2255 | dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE); | |
2256 | if (dbm == NULL) | |
2257 | { | |
2258 | store_pool = old_pool; | |
2259 | sender_rate = NULL; | |
2260 | HDEBUG(D_acl) debug_printf("ratelimit database not available\n"); | |
2261 | *log_msgptr = US"ratelimit database not available"; | |
2262 | return DEFER; | |
2263 | } | |
2264 | dbd = dbfn_read(dbm, key); | |
2265 | ||
2266 | gettimeofday(&tv, NULL); | |
2267 | ||
2268 | if (dbd == NULL) | |
2269 | { | |
2270 | HDEBUG(D_acl) debug_printf("ratelimit initializing new key's data\n"); | |
2271 | dbd = store_get(sizeof(dbdata_ratelimit)); | |
2272 | dbd->time_stamp = tv.tv_sec; | |
2273 | dbd->time_usec = tv.tv_usec; | |
2274 | dbd->rate = 0.0; | |
2275 | } | |
2276 | else | |
2277 | { | |
2278 | /* The smoothed rate is computed using an exponentially weighted moving | |
2279 | average adjusted for variable sampling intervals. The standard EWMA for | |
2280 | a fixed sampling interval is: f'(t) = (1 - a) * f(t) + a * f'(t - 1) | |
2281 | where f() is the measured value and f'() is the smoothed value. | |
2282 | ||
2283 | Old data decays out of the smoothed value exponentially, such that data n | |
2284 | samples old is multiplied by a^n. The exponential decay time constant p | |
2285 | is defined such that data p samples old is multiplied by 1/e, which means | |
2286 | that a = exp(-1/p). We can maintain the same time constant for a variable | |
2287 | sampling interval i by using a = exp(-i/p). | |
2288 | ||
2289 | The rate we are measuring is messages per period, suitable for directly | |
2290 | comparing with the limit. The average rate between now and the previous | |
2291 | message is period / interval, which we feed into the EWMA as the sample. | |
2292 | ||
2293 | It turns out that the number of messages required for the smoothed rate | |
2294 | to reach the limit when they are sent in a burst is equal to the limit. | |
2295 | This can be seen by analysing the value of the smoothed rate after N | |
2296 | messages sent at even intervals. Let k = (1 - a) * p/i | |
2297 | ||
2298 | rate_1 = (1 - a) * p/i + a * rate_0 | |
2299 | = k + a * rate_0 | |
2300 | rate_2 = k + a * rate_1 | |
2301 | = k + a * k + a^2 * rate_0 | |
2302 | rate_3 = k + a * k + a^2 * k + a^3 * rate_0 | |
2303 | rate_N = rate_0 * a^N + k * SUM(x=0..N-1)(a^x) | |
2304 | = rate_0 * a^N + k * (1 - a^N) / (1 - a) | |
2305 | = rate_0 * a^N + p/i * (1 - a^N) | |
2306 | ||
2307 | When N is large, a^N -> 0 so rate_N -> p/i as desired. | |
2308 | ||
2309 | rate_N = p/i + (rate_0 - p/i) * a^N | |
2310 | a^N = (rate_N - p/i) / (rate_0 - p/i) | |
2311 | N * -i/p = log((rate_N - p/i) / (rate_0 - p/i)) | |
2312 | N = p/i * log((rate_0 - p/i) / (rate_N - p/i)) | |
2313 | ||
2314 | Numerical analysis of the above equation, setting the computed rate to | |
2315 | increase from rate_0 = 0 to rate_N = limit, shows that for large sending | |
2316 | rates, p/i, the number of messages N = limit. So limit serves as both the | |
2317 | maximum rate measured in messages per period, and the maximum number of | |
2318 | messages that can be sent in a fast burst. */ | |
2319 | ||
2320 | double this_time = (double)tv.tv_sec | |
2321 | + (double)tv.tv_usec / 1000000.0; | |
2322 | double prev_time = (double)dbd->time_stamp | |
2323 | + (double)dbd->time_usec / 1000000.0; | |
870f6ba8 TF |
2324 | |
2325 | /* We must avoid division by zero, and deal gracefully with the clock going | |
2326 | backwards. If we blunder ahead when time is in reverse then the computed | |
e5d5a95f | 2327 | rate will be bogus. To be safe we clamp interval to a very small number. */ |
870f6ba8 | 2328 | |
e5d5a95f TF |
2329 | double interval = this_time - prev_time <= 0.0 ? 1e-9 |
2330 | : this_time - prev_time; | |
2331 | ||
2332 | double i_over_p = interval / period; | |
2333 | double a = exp(-i_over_p); | |
870f6ba8 TF |
2334 | |
2335 | dbd->time_stamp = tv.tv_sec; | |
2336 | dbd->time_usec = tv.tv_usec; | |
2337 | ||
2338 | /* If we are measuring the rate in bytes per period, multiply the | |
2339 | measured rate by the message size. If we don't know the message size | |
2340 | then it's safe to just use a value of zero and let the recorded rate | |
2341 | decay as if nothing happened. */ | |
2342 | ||
2343 | if (per_byte) | |
2344 | dbd->rate = (message_size < 0 ? 0.0 : (double)message_size) | |
2345 | * (1 - a) / i_over_p + a * dbd->rate; | |
90fc3069 TF |
2346 | else if (per_cmd && where == ACL_WHERE_NOTSMTP) |
2347 | dbd->rate = (double)recipients_count | |
2348 | * (1 - a) / i_over_p + a * dbd->rate; | |
870f6ba8 TF |
2349 | else |
2350 | dbd->rate = (1 - a) / i_over_p + a * dbd->rate; | |
2351 | } | |
2352 | ||
3348576f TF |
2353 | /* Clients sending at the limit are considered to be over the limit. This |
2354 | matters for edge cases such the first message sent by a client (which gets | |
2355 | the initial rate of 0.0) when the rate limit is zero (i.e. the client should | |
2356 | be completely blocked). */ | |
2357 | ||
2358 | if (dbd->rate < limit) rc = FAIL; | |
2359 | else rc = OK; | |
870f6ba8 TF |
2360 | |
2361 | /* Update the state if the rate is low or if we are being strict. If we | |
2362 | are in leaky mode and the sender's rate is too high, we do not update | |
2363 | the recorded rate in order to avoid an over-aggressive sender's retry | |
2364 | rate preventing them from getting any email through. */ | |
2365 | ||
2366 | if (rc == FAIL || !leaky) | |
2367 | dbfn_write(dbm, key, dbd, sizeof(dbdata_ratelimit)); | |
2368 | dbfn_close(dbm); | |
2369 | ||
2370 | /* Store the result in the tree for future reference, if necessary. */ | |
2371 | ||
2372 | if (anchor != NULL) | |
2373 | { | |
2374 | t = store_get(sizeof(tree_node) + Ustrlen(key)); | |
2375 | t->data.ptr = dbd; | |
2376 | Ustrcpy(t->name, key); | |
2377 | (void)tree_insertnode(anchor, t); | |
2378 | } | |
2379 | ||
2380 | /* We create the formatted version of the sender's rate very late in | |
2381 | order to ensure that it is done using the correct storage pool. */ | |
2382 | ||
2383 | store_pool = old_pool; | |
2384 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2385 | ||
2386 | HDEBUG(D_acl) | |
2387 | debug_printf("ratelimit computed rate %s\n", sender_rate); | |
2388 | ||
2389 | return rc; | |
2390 | } | |
2391 | ||
2392 | ||
2393 | ||
059ec3d9 PH |
2394 | /************************************************* |
2395 | * Handle conditions/modifiers on an ACL item * | |
2396 | *************************************************/ | |
2397 | ||
2398 | /* Called from acl_check() below. | |
2399 | ||
2400 | Arguments: | |
2401 | verb ACL verb | |
2402 | cb ACL condition block - if NULL, result is OK | |
2403 | where where called from | |
2404 | addr the address being checked for RCPT, or NULL | |
2405 | level the nesting level | |
2406 | epp pointer to pass back TRUE if "endpass" encountered | |
2407 | (applies only to "accept" and "discard") | |
2408 | user_msgptr user message pointer | |
2409 | log_msgptr log message pointer | |
2410 | basic_errno pointer to where to put verify error | |
2411 | ||
2412 | Returns: OK - all conditions are met | |
2413 | DISCARD - an "acl" condition returned DISCARD - only allowed | |
2414 | for "accept" or "discard" verbs | |
2415 | FAIL - at least one condition fails | |
2416 | FAIL_DROP - an "acl" condition returned FAIL_DROP | |
2417 | DEFER - can't tell at the moment (typically, lookup defer, | |
2418 | but can be temporary callout problem) | |
2419 | ERROR - ERROR from nested ACL or expansion failure or other | |
2420 | error | |
2421 | */ | |
2422 | ||
2423 | static int | |
2424 | acl_check_condition(int verb, acl_condition_block *cb, int where, | |
2425 | address_item *addr, int level, BOOL *epp, uschar **user_msgptr, | |
2426 | uschar **log_msgptr, int *basic_errno) | |
2427 | { | |
2428 | uschar *user_message = NULL; | |
2429 | uschar *log_message = NULL; | |
91ecef39 | 2430 | uschar *p = NULL; |
059ec3d9 | 2431 | int rc = OK; |
8523533c TK |
2432 | #ifdef WITH_CONTENT_SCAN |
2433 | int sep = '/'; | |
2434 | #endif | |
059ec3d9 PH |
2435 | |
2436 | for (; cb != NULL; cb = cb->next) | |
2437 | { | |
2438 | uschar *arg; | |
8e669ac1 | 2439 | int control_type; |
059ec3d9 PH |
2440 | |
2441 | /* The message and log_message items set up messages to be used in | |
2442 | case of rejection. They are expanded later. */ | |
2443 | ||
2444 | if (cb->type == ACLC_MESSAGE) | |
2445 | { | |
2446 | user_message = cb->arg; | |
2447 | continue; | |
2448 | } | |
2449 | ||
2450 | if (cb->type == ACLC_LOG_MESSAGE) | |
2451 | { | |
2452 | log_message = cb->arg; | |
2453 | continue; | |
2454 | } | |
2455 | ||
2456 | /* The endpass "condition" just sets a flag to show it occurred. This is | |
2457 | checked at compile time to be on an "accept" or "discard" item. */ | |
2458 | ||
2459 | if (cb->type == ACLC_ENDPASS) | |
2460 | { | |
2461 | *epp = TRUE; | |
2462 | continue; | |
2463 | } | |
2464 | ||
2465 | /* For other conditions and modifiers, the argument is expanded now for some | |
2466 | of them, but not for all, because expansion happens down in some lower level | |
2467 | checking functions in some cases. */ | |
2468 | ||
2469 | if (cond_expand_at_top[cb->type]) | |
2470 | { | |
2471 | arg = expand_string(cb->arg); | |
2472 | if (arg == NULL) | |
2473 | { | |
2474 | if (expand_string_forcedfail) continue; | |
2475 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
2476 | cb->arg, expand_string_message); | |
2477 | return search_find_defer? DEFER : ERROR; | |
2478 | } | |
2479 | } | |
2480 | else arg = cb->arg; | |
2481 | ||
2482 | /* Show condition, and expanded condition if it's different */ | |
2483 | ||
2484 | HDEBUG(D_acl) | |
2485 | { | |
2486 | int lhswidth = 0; | |
2487 | debug_printf("check %s%s %n", | |
2488 | (!cond_modifiers[cb->type] && cb->u.negated)? "!":"", | |
2489 | conditions[cb->type], &lhswidth); | |
2490 | ||
2491 | if (cb->type == ACLC_SET) | |
2492 | { | |
38a0a95f PH |
2493 | debug_printf("acl_%s ", cb->u.varname); |
2494 | lhswidth += 5 + Ustrlen(cb->u.varname); | |
059ec3d9 PH |
2495 | } |
2496 | ||
2497 | debug_printf("= %s\n", cb->arg); | |
2498 | ||
2499 | if (arg != cb->arg) | |
2500 | debug_printf("%.*s= %s\n", lhswidth, | |
2501 | US" ", CS arg); | |
2502 | } | |
2503 | ||
2504 | /* Check that this condition makes sense at this time */ | |
2505 | ||
2506 | if ((cond_forbids[cb->type] & (1 << where)) != 0) | |
2507 | { | |
2508 | *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL", | |
2509 | cond_modifiers[cb->type]? "use" : "test", | |
2510 | conditions[cb->type], acl_wherenames[where]); | |
2511 | return ERROR; | |
2512 | } | |
2513 | ||
2514 | /* Run the appropriate test for each condition, or take the appropriate | |
2515 | action for the remaining modifiers. */ | |
2516 | ||
2517 | switch(cb->type) | |
2518 | { | |
71fafd95 PH |
2519 | case ACLC_ADD_HEADER: |
2520 | setup_header(arg); | |
2521 | break; | |
2522 | ||
059ec3d9 PH |
2523 | /* A nested ACL that returns "discard" makes sense only for an "accept" or |
2524 | "discard" verb. */ | |
71fafd95 | 2525 | |
059ec3d9 PH |
2526 | case ACLC_ACL: |
2527 | rc = acl_check_internal(where, addr, arg, level+1, user_msgptr, log_msgptr); | |
2528 | if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD) | |
2529 | { | |
2530 | *log_msgptr = string_sprintf("nested ACL returned \"discard\" for " | |
2531 | "\"%s\" command (only allowed with \"accept\" or \"discard\")", | |
2532 | verbs[verb]); | |
2533 | return ERROR; | |
2534 | } | |
2535 | break; | |
2536 | ||
2537 | case ACLC_AUTHENTICATED: | |
2538 | rc = (sender_host_authenticated == NULL)? FAIL : | |
2539 | match_isinlist(sender_host_authenticated, &arg, 0, NULL, NULL, MCL_STRING, | |
2540 | TRUE, NULL); | |
2541 | break; | |
2542 | ||
71fafd95 | 2543 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
8523533c TK |
2544 | case ACLC_BMI_OPTIN: |
2545 | { | |
2546 | int old_pool = store_pool; | |
2547 | store_pool = POOL_PERM; | |
2548 | bmi_current_optin = string_copy(arg); | |
2549 | store_pool = old_pool; | |
2550 | } | |
2551 | break; | |
71fafd95 | 2552 | #endif |
8523533c | 2553 | |
059ec3d9 PH |
2554 | case ACLC_CONDITION: |
2555 | if (Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */ | |
2556 | rc = (Uatoi(arg) == 0)? FAIL : OK; | |
2557 | else | |
2558 | rc = (strcmpic(arg, US"no") == 0 || | |
2559 | strcmpic(arg, US"false") == 0)? FAIL : | |
2560 | (strcmpic(arg, US"yes") == 0 || | |
2561 | strcmpic(arg, US"true") == 0)? OK : DEFER; | |
2562 | if (rc == DEFER) | |
2563 | *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg); | |
2564 | break; | |
2565 | ||
c3611384 PH |
2566 | case ACLC_CONTINUE: /* Always succeeds */ |
2567 | break; | |
2568 | ||
059ec3d9 | 2569 | case ACLC_CONTROL: |
c5fcb476 PH |
2570 | control_type = decode_control(arg, &p, where, log_msgptr); |
2571 | ||
8523533c | 2572 | /* Check if this control makes sense at this time */ |
c5fcb476 PH |
2573 | |
2574 | if ((control_forbids[control_type] & (1 << where)) != 0) | |
2575 | { | |
2576 | *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL", | |
2577 | controls[control_type], acl_wherenames[where]); | |
2578 | return ERROR; | |
8e669ac1 | 2579 | } |
c5fcb476 PH |
2580 | |
2581 | switch(control_type) | |
059ec3d9 | 2582 | { |
c46782ef PH |
2583 | case CONTROL_AUTH_UNADVERTISED: |
2584 | allow_auth_unadvertised = TRUE; | |
2585 | break; | |
2586 | ||
2587 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
8523533c TK |
2588 | case CONTROL_BMI_RUN: |
2589 | bmi_run = 1; | |
2590 | break; | |
c46782ef PH |
2591 | #endif |
2592 | ||
2593 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
fb2274d4 TK |
2594 | case CONTROL_DK_VERIFY: |
2595 | dk_do_verify = 1; | |
2596 | break; | |
c46782ef PH |
2597 | #endif |
2598 | ||
059ec3d9 PH |
2599 | case CONTROL_ERROR: |
2600 | return ERROR; | |
2601 | ||
2602 | case CONTROL_CASEFUL_LOCAL_PART: | |
2603 | deliver_localpart = addr->cc_local_part; | |
2604 | break; | |
2605 | ||
2606 | case CONTROL_CASELOWER_LOCAL_PART: | |
2607 | deliver_localpart = addr->lc_local_part; | |
2608 | break; | |
2609 | ||
2610 | case CONTROL_ENFORCE_SYNC: | |
2611 | smtp_enforce_sync = TRUE; | |
2612 | break; | |
2613 | ||
2614 | case CONTROL_NO_ENFORCE_SYNC: | |
2615 | smtp_enforce_sync = FALSE; | |
2616 | break; | |
2617 | ||
c46782ef | 2618 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
2619 | case CONTROL_NO_MBOX_UNSPOOL: |
2620 | no_mbox_unspool = TRUE; | |
2621 | break; | |
c46782ef | 2622 | #endif |
8523533c | 2623 | |
059ec3d9 PH |
2624 | case CONTROL_NO_MULTILINE: |
2625 | no_multiline_responses = TRUE; | |
2626 | break; | |
2627 | ||
cf8b11a5 PH |
2628 | case CONTROL_NO_PIPELINING: |
2629 | pipelining_enable = FALSE; | |
2630 | break; | |
2631 | ||
047bdd8c PH |
2632 | case CONTROL_NO_DELAY_FLUSH: |
2633 | disable_delay_flush = TRUE; | |
2634 | break; | |
2635 | ||
4c590bd1 PH |
2636 | case CONTROL_NO_CALLOUT_FLUSH: |
2637 | disable_callout_flush = TRUE; | |
2638 | break; | |
2639 | ||
29aba418 | 2640 | case CONTROL_FAKEDEFER: |
8523533c | 2641 | case CONTROL_FAKEREJECT: |
29aba418 | 2642 | fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL; |
8523533c | 2643 | if (*p == '/') |
8e669ac1 | 2644 | { |
8523533c | 2645 | uschar *pp = p + 1; |
8e669ac1 | 2646 | while (*pp != 0) pp++; |
29aba418 | 2647 | fake_response_text = expand_string(string_copyn(p+1, pp-p-1)); |
8523533c TK |
2648 | p = pp; |
2649 | } | |
2650 | else | |
2651 | { | |
2652 | /* Explicitly reset to default string */ | |
29aba418 | 2653 | 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 |
2654 | } |
2655 | break; | |
8523533c | 2656 | |
059ec3d9 PH |
2657 | case CONTROL_FREEZE: |
2658 | deliver_freeze = TRUE; | |
2659 | deliver_frozen_at = time(NULL); | |
6a3f1455 PH |
2660 | freeze_tell = freeze_tell_config; /* Reset to configured value */ |
2661 | if (Ustrncmp(p, "/no_tell", 8) == 0) | |
2662 | { | |
2663 | p += 8; | |
2664 | freeze_tell = NULL; | |
2665 | } | |
2666 | if (*p != 0) | |
2667 | { | |
2668 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2669 | return ERROR; | |
2670 | } | |
059ec3d9 PH |
2671 | break; |
2672 | ||
2673 | case CONTROL_QUEUE_ONLY: | |
2674 | queue_only_policy = TRUE; | |
2675 | break; | |
2676 | ||
2677 | case CONTROL_SUBMISSION: | |
87ba3f5f | 2678 | originator_name = US""; |
059ec3d9 | 2679 | submission_mode = TRUE; |
69358f02 | 2680 | while (*p == '/') |
8e669ac1 | 2681 | { |
69358f02 PH |
2682 | if (Ustrncmp(p, "/sender_retain", 14) == 0) |
2683 | { | |
2684 | p += 14; | |
2685 | active_local_sender_retain = TRUE; | |
8e669ac1 PH |
2686 | active_local_from_check = FALSE; |
2687 | } | |
69358f02 PH |
2688 | else if (Ustrncmp(p, "/domain=", 8) == 0) |
2689 | { | |
2690 | uschar *pp = p + 8; | |
8e669ac1 | 2691 | while (*pp != 0 && *pp != '/') pp++; |
87ba3f5f PH |
2692 | submission_domain = string_copyn(p+8, pp-p-8); |
2693 | p = pp; | |
2694 | } | |
8857ccfd PH |
2695 | /* The name= option must be last, because it swallows the rest of |
2696 | the string. */ | |
87ba3f5f PH |
2697 | else if (Ustrncmp(p, "/name=", 6) == 0) |
2698 | { | |
2699 | uschar *pp = p + 6; | |
8857ccfd | 2700 | while (*pp != 0) pp++; |
2fe1a124 | 2701 | submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6, |
87ba3f5f | 2702 | big_buffer, big_buffer_size)); |
8e669ac1 | 2703 | p = pp; |
69358f02 | 2704 | } |
8e669ac1 PH |
2705 | else break; |
2706 | } | |
69358f02 | 2707 | if (*p != 0) |
059ec3d9 | 2708 | { |
69358f02 | 2709 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); |
059ec3d9 PH |
2710 | return ERROR; |
2711 | } | |
2712 | break; | |
8800895a PH |
2713 | |
2714 | case CONTROL_SUPPRESS_LOCAL_FIXUPS: | |
2715 | suppress_local_fixups = TRUE; | |
2716 | break; | |
059ec3d9 PH |
2717 | } |
2718 | break; | |
2719 | ||
71fafd95 | 2720 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
2721 | case ACLC_DECODE: |
2722 | rc = mime_decode(&arg); | |
2723 | break; | |
71fafd95 | 2724 | #endif |
8523533c | 2725 | |
059ec3d9 PH |
2726 | case ACLC_DELAY: |
2727 | { | |
2728 | int delay = readconf_readtime(arg, 0, FALSE); | |
2729 | if (delay < 0) | |
2730 | { | |
2731 | *log_msgptr = string_sprintf("syntax error in argument for \"delay\" " | |
2732 | "modifier: \"%s\" is not a time value", arg); | |
2733 | return ERROR; | |
2734 | } | |
2735 | else | |
2736 | { | |
2737 | HDEBUG(D_acl) debug_printf("delay modifier requests %d-second delay\n", | |
2738 | delay); | |
2739 | if (host_checking) | |
2740 | { | |
2741 | HDEBUG(D_acl) | |
2742 | debug_printf("delay skipped in -bh checking mode\n"); | |
2743 | } | |
010c2d14 PH |
2744 | |
2745 | /* It appears to be impossible to detect that a TCP/IP connection has | |
2746 | gone away without reading from it. This means that we cannot shorten | |
2747 | the delay below if the client goes away, because we cannot discover | |
2748 | that the client has closed its end of the connection. (The connection | |
2749 | is actually in a half-closed state, waiting for the server to close its | |
2750 | end.) It would be nice to be able to detect this state, so that the | |
2751 | Exim process is not held up unnecessarily. However, it seems that we | |
2752 | can't. The poll() function does not do the right thing, and in any case | |
2753 | it is not always available. | |
2754 | ||
047bdd8c | 2755 | NOTE 1: If ever this state of affairs changes, remember that we may be |
010c2d14 | 2756 | dealing with stdin/stdout here, in addition to TCP/IP connections. |
047bdd8c PH |
2757 | Also, delays may be specified for non-SMTP input, where smtp_out and |
2758 | smtp_in will be NULL. Whatever is done must work in all cases. | |
2759 | ||
2760 | NOTE 2: The added feature of flushing the output before a delay must | |
2761 | apply only to SMTP input. Hence the test for smtp_out being non-NULL. | |
2762 | */ | |
010c2d14 | 2763 | |
8e669ac1 | 2764 | else |
86b8287f | 2765 | { |
14f4a80d | 2766 | if (smtp_out != NULL && !disable_delay_flush) mac_smtp_fflush(); |
86b8287f | 2767 | while (delay > 0) delay = sleep(delay); |
8e669ac1 | 2768 | } |
059ec3d9 PH |
2769 | } |
2770 | } | |
2771 | break; | |
2772 | ||
71fafd95 | 2773 | #ifdef WITH_OLD_DEMIME |
8523533c TK |
2774 | case ACLC_DEMIME: |
2775 | rc = demime(&arg); | |
2776 | break; | |
71fafd95 | 2777 | #endif |
8523533c | 2778 | |
71fafd95 PH |
2779 | #ifdef EXPERIMENTAL_DOMAINKEYS |
2780 | case ACLC_DK_DOMAIN_SOURCE: | |
fb2274d4 TK |
2781 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2782 | /* check header source of domain against given string */ | |
2783 | switch (dk_verify_block->address_source) { | |
2784 | case DK_EXIM_ADDRESS_FROM_FROM: | |
2785 | rc = match_isinlist(US"from", &arg, 0, NULL, | |
2786 | NULL, MCL_STRING, TRUE, NULL); | |
2787 | break; | |
2788 | case DK_EXIM_ADDRESS_FROM_SENDER: | |
2789 | rc = match_isinlist(US"sender", &arg, 0, NULL, | |
2790 | NULL, MCL_STRING, TRUE, NULL); | |
2791 | break; | |
2792 | case DK_EXIM_ADDRESS_NONE: | |
2793 | rc = match_isinlist(US"none", &arg, 0, NULL, | |
2794 | NULL, MCL_STRING, TRUE, NULL); | |
2795 | break; | |
71fafd95 PH |
2796 | } |
2797 | break; | |
2798 | ||
2799 | case ACLC_DK_POLICY: | |
fb2274d4 TK |
2800 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2801 | /* check policy against given string, default FAIL */ | |
2802 | rc = FAIL; | |
2803 | if (dk_verify_block->signsall) | |
2804 | rc = match_isinlist(US"signsall", &arg, 0, NULL, | |
2805 | NULL, MCL_STRING, TRUE, NULL); | |
2806 | if (dk_verify_block->testing) | |
2807 | rc = match_isinlist(US"testing", &arg, 0, NULL, | |
2808 | NULL, MCL_STRING, TRUE, NULL); | |
71fafd95 PH |
2809 | break; |
2810 | ||
2811 | case ACLC_DK_SENDER_DOMAINS: | |
fb2274d4 TK |
2812 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2813 | if (dk_verify_block->domain != NULL) | |
2814 | rc = match_isinlist(dk_verify_block->domain, &arg, 0, &domainlist_anchor, | |
2815 | NULL, MCL_DOMAIN, TRUE, NULL); | |
2816 | else rc = FAIL; | |
71fafd95 PH |
2817 | break; |
2818 | ||
2819 | case ACLC_DK_SENDER_LOCAL_PARTS: | |
fb2274d4 TK |
2820 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2821 | if (dk_verify_block->local_part != NULL) | |
2822 | rc = match_isinlist(dk_verify_block->local_part, &arg, 0, &localpartlist_anchor, | |
2823 | NULL, MCL_LOCALPART, TRUE, NULL); | |
2824 | else rc = FAIL; | |
71fafd95 PH |
2825 | break; |
2826 | ||
2827 | case ACLC_DK_SENDERS: | |
fb2274d4 TK |
2828 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2829 | if (dk_verify_block->address != NULL) | |
2830 | rc = match_address_list(dk_verify_block->address, TRUE, TRUE, &arg, NULL, -1, 0, NULL); | |
2831 | else rc = FAIL; | |
71fafd95 PH |
2832 | break; |
2833 | ||
2834 | case ACLC_DK_STATUS: | |
fb2274d4 TK |
2835 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2836 | if (dk_verify_block->result > 0) { | |
2837 | switch(dk_verify_block->result) { | |
2838 | case DK_EXIM_RESULT_BAD_FORMAT: | |
2839 | rc = match_isinlist(US"bad format", &arg, 0, NULL, | |
2840 | NULL, MCL_STRING, TRUE, NULL); | |
2841 | break; | |
2842 | case DK_EXIM_RESULT_NO_KEY: | |
2843 | rc = match_isinlist(US"no key", &arg, 0, NULL, | |
2844 | NULL, MCL_STRING, TRUE, NULL); | |
2845 | break; | |
2846 | case DK_EXIM_RESULT_NO_SIGNATURE: | |
2847 | rc = match_isinlist(US"no signature", &arg, 0, NULL, | |
2848 | NULL, MCL_STRING, TRUE, NULL); | |
2849 | break; | |
2850 | case DK_EXIM_RESULT_REVOKED: | |
2851 | rc = match_isinlist(US"revoked", &arg, 0, NULL, | |
2852 | NULL, MCL_STRING, TRUE, NULL); | |
2853 | break; | |
2854 | case DK_EXIM_RESULT_NON_PARTICIPANT: | |
2855 | rc = match_isinlist(US"non-participant", &arg, 0, NULL, | |
2856 | NULL, MCL_STRING, TRUE, NULL); | |
2857 | break; | |
2858 | case DK_EXIM_RESULT_GOOD: | |
2859 | rc = match_isinlist(US"good", &arg, 0, NULL, | |
2860 | NULL, MCL_STRING, TRUE, NULL); | |
2861 | break; | |
2862 | case DK_EXIM_RESULT_BAD: | |
2863 | rc = match_isinlist(US"bad", &arg, 0, NULL, | |
2864 | NULL, MCL_STRING, TRUE, NULL); | |
2865 | break; | |
71fafd95 | 2866 | } |
fb2274d4 | 2867 | } |
71fafd95 PH |
2868 | break; |
2869 | #endif | |
fb2274d4 | 2870 | |
059ec3d9 PH |
2871 | case ACLC_DNSLISTS: |
2872 | rc = verify_check_dnsbl(&arg); | |
2873 | break; | |
2874 | ||
2875 | case ACLC_DOMAINS: | |
2876 | rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor, | |
2877 | addr->domain_cache, MCL_DOMAIN, TRUE, &deliver_domain_data); | |
2878 | break; | |
2879 | ||
2880 | /* The value in tls_cipher is the full cipher name, for example, | |
2881 | TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the | |
2882 | cipher names such as DES-CBC3-SHA. But program defensively. We don't know | |
2883 | what may in practice come out of the SSL library - which at the time of | |
2884 | writing is poorly documented. */ | |
2885 | ||
2886 | case ACLC_ENCRYPTED: | |
2887 | if (tls_cipher == NULL) rc = FAIL; else | |
2888 | { | |
2889 | uschar *endcipher = NULL; | |
2890 | uschar *cipher = Ustrchr(tls_cipher, ':'); | |
2891 | if (cipher == NULL) cipher = tls_cipher; else | |
2892 | { | |
2893 | endcipher = Ustrchr(++cipher, ':'); | |
2894 | if (endcipher != NULL) *endcipher = 0; | |
2895 | } | |
2896 | rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL); | |
2897 | if (endcipher != NULL) *endcipher = ':'; | |
2898 | } | |
2899 | break; | |
2900 | ||
2901 | /* Use verify_check_this_host() instead of verify_check_host() so that | |
2902 | we can pass over &host_data to catch any looked up data. Once it has been | |
2903 | set, it retains its value so that it's still there if another ACL verb | |
2904 | comes through here and uses the cache. However, we must put it into | |
2905 | permanent store in case it is also expected to be used in a subsequent | |
2906 | message in the same SMTP connection. */ | |
2907 | ||
2908 | case ACLC_HOSTS: | |
2909 | rc = verify_check_this_host(&arg, sender_host_cache, NULL, | |
2910 | (sender_host_address == NULL)? US"" : sender_host_address, &host_data); | |
2911 | if (host_data != NULL) host_data = string_copy_malloc(host_data); | |
2912 | break; | |
2913 | ||
2914 | case ACLC_LOCAL_PARTS: | |
2915 | rc = match_isinlist(addr->cc_local_part, &arg, 0, | |
2916 | &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE, | |
2917 | &deliver_localpart_data); | |
2918 | break; | |
2919 | ||
6ea85e9a PH |
2920 | case ACLC_LOG_REJECT_TARGET: |
2921 | { | |
2922 | int logbits = 0; | |
2923 | int sep = 0; | |
2924 | uschar *s = arg; | |
2925 | uschar *ss; | |
2926 | while ((ss = string_nextinlist(&s, &sep, big_buffer, big_buffer_size)) | |
2927 | != NULL) | |
2928 | { | |
2929 | if (Ustrcmp(ss, "main") == 0) logbits |= LOG_MAIN; | |
2930 | else if (Ustrcmp(ss, "panic") == 0) logbits |= LOG_PANIC; | |
2931 | else if (Ustrcmp(ss, "reject") == 0) logbits |= LOG_REJECT; | |
2932 | else | |
2933 | { | |
2934 | logbits |= LOG_MAIN|LOG_REJECT; | |
2935 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown log name \"%s\" in " | |
2936 | "\"log_reject_target\" in %s ACL", ss, acl_wherenames[where]); | |
2937 | } | |
2938 | } | |
2939 | log_reject_target = logbits; | |
2940 | } | |
2941 | break; | |
2942 | ||
059ec3d9 PH |
2943 | case ACLC_LOGWRITE: |
2944 | { | |
2945 | int logbits = 0; | |
2946 | uschar *s = arg; | |
2947 | if (*s == ':') | |
2948 | { | |
2949 | s++; | |
2950 | while (*s != ':') | |
2951 | { | |
2952 | if (Ustrncmp(s, "main", 4) == 0) | |
2953 | { logbits |= LOG_MAIN; s += 4; } | |
2954 | else if (Ustrncmp(s, "panic", 5) == 0) | |
2955 | { logbits |= LOG_PANIC; s += 5; } | |
2956 | else if (Ustrncmp(s, "reject", 6) == 0) | |
2957 | { logbits |= LOG_REJECT; s += 6; } | |
2958 | else | |
2959 | { | |
2960 | logbits = LOG_MAIN|LOG_PANIC; | |
2961 | s = string_sprintf(":unknown log name in \"%s\" in " | |
2962 | "\"logwrite\" in %s ACL", arg, acl_wherenames[where]); | |
2963 | } | |
2964 | if (*s == ',') s++; | |
2965 | } | |
2966 | s++; | |
2967 | } | |
2968 | while (isspace(*s)) s++; | |
6ea85e9a PH |
2969 | |
2970 | ||
059ec3d9 PH |
2971 | if (logbits == 0) logbits = LOG_MAIN; |
2972 | log_write(0, logbits, "%s", string_printing(s)); | |
2973 | } | |
2974 | break; | |
8e669ac1 | 2975 | |
71fafd95 | 2976 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
2977 | case ACLC_MALWARE: |
2978 | { | |
6ea85e9a | 2979 | /* Separate the regular expression and any optional parameters. */ |
8523533c TK |
2980 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); |
2981 | /* Run the malware backend. */ | |
2982 | rc = malware(&ss); | |
2983 | /* Modify return code based upon the existance of options. */ | |
2984 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2985 | != NULL) { | |
2986 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
2987 | { | |
2988 | /* FAIL so that the message is passed to the next ACL */ | |
2989 | rc = FAIL; | |
2990 | } | |
2991 | } | |
2992 | } | |
2993 | break; | |
2994 | ||
2995 | case ACLC_MIME_REGEX: | |
71fafd95 | 2996 | rc = mime_regex(&arg); |
8523533c | 2997 | break; |
71fafd95 | 2998 | #endif |
059ec3d9 | 2999 | |
870f6ba8 | 3000 | case ACLC_RATELIMIT: |
90fc3069 | 3001 | rc = acl_ratelimit(arg, where, log_msgptr); |
870f6ba8 TF |
3002 | break; |
3003 | ||
059ec3d9 PH |
3004 | case ACLC_RECIPIENTS: |
3005 | rc = match_address_list(addr->address, TRUE, TRUE, &arg, NULL, -1, 0, | |
3006 | &recipient_data); | |
3007 | break; | |
3008 | ||
71fafd95 PH |
3009 | #ifdef WITH_CONTENT_SCAN |
3010 | case ACLC_REGEX: | |
3011 | rc = regex(&arg); | |
8523533c | 3012 | break; |
71fafd95 | 3013 | #endif |
8523533c | 3014 | |
059ec3d9 PH |
3015 | case ACLC_SENDER_DOMAINS: |
3016 | { | |
3017 | uschar *sdomain; | |
3018 | sdomain = Ustrrchr(sender_address, '@'); | |
3019 | sdomain = (sdomain == NULL)? US"" : sdomain + 1; | |
3020 | rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor, | |
3021 | sender_domain_cache, MCL_DOMAIN, TRUE, NULL); | |
3022 | } | |
3023 | break; | |
3024 | ||
3025 | case ACLC_SENDERS: | |
3026 | rc = match_address_list(sender_address, TRUE, TRUE, &arg, | |
3027 | sender_address_cache, -1, 0, &sender_data); | |
3028 | break; | |
3029 | ||
3030 | /* Connection variables must persist forever */ | |
3031 | ||
3032 | case ACLC_SET: | |
3033 | { | |
3034 | int old_pool = store_pool; | |
38a0a95f PH |
3035 | if (cb->u.varname[0] == 'c') store_pool = POOL_PERM; |
3036 | acl_var_create(cb->u.varname)->data.ptr = string_copy(arg); | |
059ec3d9 PH |
3037 | store_pool = old_pool; |
3038 | } | |
3039 | break; | |
3040 | ||
71fafd95 | 3041 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3042 | case ACLC_SPAM: |
3043 | { | |
3044 | /* Seperate the regular expression and any optional parameters. */ | |
3045 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); | |
3046 | /* Run the spam backend. */ | |
3047 | rc = spam(&ss); | |
3048 | /* Modify return code based upon the existance of options. */ | |
3049 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
3050 | != NULL) { | |
3051 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
3052 | { | |
3053 | /* FAIL so that the message is passed to the next ACL */ | |
3054 | rc = FAIL; | |
3055 | } | |
3056 | } | |
3057 | } | |
3058 | break; | |
71fafd95 | 3059 | #endif |
8523533c | 3060 | |
71fafd95 | 3061 | #ifdef EXPERIMENTAL_SPF |
8523533c TK |
3062 | case ACLC_SPF: |
3063 | rc = spf_process(&arg, sender_address); | |
3064 | break; | |
71fafd95 | 3065 | #endif |
8523533c | 3066 | |
059ec3d9 PH |
3067 | /* If the verb is WARN, discard any user message from verification, because |
3068 | such messages are SMTP responses, not header additions. The latter come | |
475fe28a PH |
3069 | only from explicit "message" modifiers. However, put the user message into |
3070 | $acl_verify_message so it can be used in subsequent conditions or modifiers | |
3071 | (until something changes it). */ | |
059ec3d9 PH |
3072 | |
3073 | case ACLC_VERIFY: | |
3074 | rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno); | |
475fe28a | 3075 | acl_verify_message = *user_msgptr; |
059ec3d9 PH |
3076 | if (verb == ACL_WARN) *user_msgptr = NULL; |
3077 | break; | |
3078 | ||
3079 | default: | |
3080 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown " | |
3081 | "condition %d", cb->type); | |
3082 | break; | |
3083 | } | |
3084 | ||
3085 | /* If a condition was negated, invert OK/FAIL. */ | |
3086 | ||
3087 | if (!cond_modifiers[cb->type] && cb->u.negated) | |
3088 | { | |
3089 | if (rc == OK) rc = FAIL; | |
3090 | else if (rc == FAIL || rc == FAIL_DROP) rc = OK; | |
3091 | } | |
3092 | ||
3093 | if (rc != OK) break; /* Conditions loop */ | |
3094 | } | |
3095 | ||
3096 | ||
3097 | /* If the result is the one for which "message" and/or "log_message" are used, | |
4e88a19f PH |
3098 | handle the values of these modifiers. If there isn't a log message set, we make |
3099 | it the same as the user message. | |
059ec3d9 PH |
3100 | |
3101 | "message" is a user message that will be included in an SMTP response. Unless | |
3102 | it is empty, it overrides any previously set user message. | |
3103 | ||
3104 | "log_message" is a non-user message, and it adds to any existing non-user | |
3105 | message that is already set. | |
3106 | ||
4e88a19f PH |
3107 | Most verbs have but a single return for which the messages are relevant, but |
3108 | for "discard", it's useful to have the log message both when it succeeds and | |
3109 | when it fails. For "accept", the message is used in the OK case if there is no | |
3110 | "endpass", but (for backwards compatibility) in the FAIL case if "endpass" is | |
3111 | present. */ | |
059ec3d9 | 3112 | |
4e88a19f PH |
3113 | if (*epp && rc == OK) user_message = NULL; |
3114 | ||
3115 | if (((1<<rc) & msgcond[verb]) != 0) | |
059ec3d9 PH |
3116 | { |
3117 | uschar *expmessage; | |
4e88a19f PH |
3118 | uschar *old_user_msgptr = *user_msgptr; |
3119 | uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr; | |
059ec3d9 PH |
3120 | |
3121 | /* If the verb is "warn", messages generated by conditions (verification or | |
4e88a19f PH |
3122 | nested ACLs) are always discarded. This also happens for acceptance verbs |
3123 | when they actually do accept. Only messages specified at this level are used. | |
059ec3d9 PH |
3124 | However, the value of an existing message is available in $acl_verify_message |
3125 | during expansions. */ | |
3126 | ||
4e88a19f PH |
3127 | if (verb == ACL_WARN || |
3128 | (rc == OK && (verb == ACL_ACCEPT || verb == ACL_DISCARD))) | |
3129 | *log_msgptr = *user_msgptr = NULL; | |
059ec3d9 PH |
3130 | |
3131 | if (user_message != NULL) | |
3132 | { | |
3133 | acl_verify_message = old_user_msgptr; | |
3134 | expmessage = expand_string(user_message); | |
3135 | if (expmessage == NULL) | |
3136 | { | |
3137 | if (!expand_string_forcedfail) | |
3138 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3139 | user_message, expand_string_message); | |
3140 | } | |
3141 | else if (expmessage[0] != 0) *user_msgptr = expmessage; | |
3142 | } | |
3143 | ||
3144 | if (log_message != NULL) | |
3145 | { | |
3146 | acl_verify_message = old_log_msgptr; | |
3147 | expmessage = expand_string(log_message); | |
3148 | if (expmessage == NULL) | |
3149 | { | |
3150 | if (!expand_string_forcedfail) | |
3151 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3152 | log_message, expand_string_message); | |
3153 | } | |
3154 | else if (expmessage[0] != 0) | |
3155 | { | |
3156 | *log_msgptr = (*log_msgptr == NULL)? expmessage : | |
3157 | string_sprintf("%s: %s", expmessage, *log_msgptr); | |
3158 | } | |
3159 | } | |
3160 | ||
3161 | /* If no log message, default it to the user message */ | |
3162 | ||
3163 | if (*log_msgptr == NULL) *log_msgptr = *user_msgptr; | |
3164 | } | |
3165 | ||
3166 | acl_verify_message = NULL; | |
3167 | return rc; | |
3168 | } | |
3169 | ||
3170 | ||
3171 | ||
3172 | ||
3173 | ||
3174 | /************************************************* | |
3175 | * Get line from a literal ACL * | |
3176 | *************************************************/ | |
3177 | ||
3178 | /* This function is passed to acl_read() in order to extract individual lines | |
3179 | of a literal ACL, which we access via static pointers. We can destroy the | |
3180 | contents because this is called only once (the compiled ACL is remembered). | |
3181 | ||
3182 | This code is intended to treat the data in the same way as lines in the main | |
3183 | Exim configuration file. That is: | |
3184 | ||
3185 | . Leading spaces are ignored. | |
3186 | ||
3187 | . A \ at the end of a line is a continuation - trailing spaces after the \ | |
3188 | are permitted (this is because I don't believe in making invisible things | |
3189 | significant). Leading spaces on the continued part of a line are ignored. | |
3190 | ||
3191 | . Physical lines starting (significantly) with # are totally ignored, and | |
3192 | may appear within a sequence of backslash-continued lines. | |
3193 | ||
3194 | . Blank lines are ignored, but will end a sequence of continuations. | |
3195 | ||
3196 | Arguments: none | |
3197 | Returns: a pointer to the next line | |
3198 | */ | |
3199 | ||
3200 | ||
3201 | static uschar *acl_text; /* Current pointer in the text */ | |
3202 | static uschar *acl_text_end; /* Points one past the terminating '0' */ | |
3203 | ||
3204 | ||
3205 | static uschar * | |
3206 | acl_getline(void) | |
3207 | { | |
3208 | uschar *yield; | |
3209 | ||
3210 | /* This loop handles leading blank lines and comments. */ | |
3211 | ||
3212 | for(;;) | |
3213 | { | |
3214 | while (isspace(*acl_text)) acl_text++; /* Leading spaces/empty lines */ | |
3215 | if (*acl_text == 0) return NULL; /* No more data */ | |
3216 | yield = acl_text; /* Potential data line */ | |
3217 | ||
3218 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3219 | ||
3220 | /* If we hit the end before a newline, we have the whole logical line. If | |
3221 | it's a comment, there's no more data to be given. Otherwise, yield it. */ | |
3222 | ||
3223 | if (*acl_text == 0) return (*yield == '#')? NULL : yield; | |
3224 | ||
3225 | /* After reaching a newline, end this loop if the physical line does not | |
3226 | start with '#'. If it does, it's a comment, and the loop continues. */ | |
3227 | ||
3228 | if (*yield != '#') break; | |
3229 | } | |
3230 | ||
3231 | /* This loop handles continuations. We know we have some real data, ending in | |
3232 | newline. See if there is a continuation marker at the end (ignoring trailing | |
3233 | white space). We know that *yield is not white space, so no need to test for | |
3234 | cont > yield in the backwards scanning loop. */ | |
3235 | ||
3236 | for(;;) | |
3237 | { | |
3238 | uschar *cont; | |
3239 | for (cont = acl_text - 1; isspace(*cont); cont--); | |
3240 | ||
3241 | /* If no continuation follows, we are done. Mark the end of the line and | |
3242 | return it. */ | |
3243 | ||
3244 | if (*cont != '\\') | |
3245 | { | |
3246 | *acl_text++ = 0; | |
3247 | return yield; | |
3248 | } | |
3249 | ||
3250 | /* We have encountered a continuation. Skip over whitespace at the start of | |
3251 | the next line, and indeed the whole of the next line or lines if they are | |
3252 | comment lines. */ | |
3253 | ||
3254 | for (;;) | |
3255 | { | |
3256 | while (*(++acl_text) == ' ' || *acl_text == '\t'); | |
3257 | if (*acl_text != '#') break; | |
3258 | while (*(++acl_text) != 0 && *acl_text != '\n'); | |
3259 | } | |
3260 | ||
3261 | /* We have the start of a continuation line. Move all the rest of the data | |
3262 | to join onto the previous line, and then find its end. If the end is not a | |
3263 | newline, we are done. Otherwise loop to look for another continuation. */ | |
3264 | ||
3265 | memmove(cont, acl_text, acl_text_end - acl_text); | |
3266 | acl_text_end -= acl_text - cont; | |
3267 | acl_text = cont; | |
3268 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3269 | if (*acl_text == 0) return yield; | |
3270 | } | |
3271 | ||
3272 | /* Control does not reach here */ | |
3273 | } | |
3274 | ||
3275 | ||
3276 | ||
3277 | ||
3278 | ||
3279 | /************************************************* | |
3280 | * Check access using an ACL * | |
3281 | *************************************************/ | |
3282 | ||
3283 | /* This function is called from address_check. It may recurse via | |
3284 | acl_check_condition() - hence the use of a level to stop looping. The ACL is | |
3285 | passed as a string which is expanded. A forced failure implies no access check | |
3286 | is required. If the result is a single word, it is taken as the name of an ACL | |
3287 | which is sought in the global ACL tree. Otherwise, it is taken as literal ACL | |
3288 | text, complete with newlines, and parsed as such. In both cases, the ACL check | |
3289 | is then run. This function uses an auxiliary function for acl_read() to call | |
3290 | for reading individual lines of a literal ACL. This is acl_getline(), which | |
3291 | appears immediately above. | |
3292 | ||
3293 | Arguments: | |
3294 | where where called from | |
3295 | addr address item when called from RCPT; otherwise NULL | |
3296 | s the input string; NULL is the same as an empty ACL => DENY | |
3297 | level the nesting level | |
3298 | user_msgptr where to put a user error (for SMTP response) | |
3299 | log_msgptr where to put a logging message (not for SMTP response) | |
3300 | ||
3301 | Returns: OK access is granted | |
3302 | DISCARD access is apparently granted... | |
3303 | FAIL access is denied | |
3304 | FAIL_DROP access is denied; drop the connection | |
3305 | DEFER can't tell at the moment | |
3306 | ERROR disaster | |
3307 | */ | |
3308 | ||
3309 | static int | |
3310 | acl_check_internal(int where, address_item *addr, uschar *s, int level, | |
3311 | uschar **user_msgptr, uschar **log_msgptr) | |
3312 | { | |
3313 | int fd = -1; | |
3314 | acl_block *acl = NULL; | |
3315 | uschar *acl_name = US"inline ACL"; | |
3316 | uschar *ss; | |
3317 | ||
3318 | /* Catch configuration loops */ | |
3319 | ||
3320 | if (level > 20) | |
3321 | { | |
3322 | *log_msgptr = US"ACL nested too deep: possible loop"; | |
3323 | return ERROR; | |
3324 | } | |
3325 | ||
3326 | if (s == NULL) | |
3327 | { | |
3328 | HDEBUG(D_acl) debug_printf("ACL is NULL: implicit DENY\n"); | |
3329 | return FAIL; | |
3330 | } | |
3331 | ||
3332 | /* At top level, we expand the incoming string. At lower levels, it has already | |
3333 | been expanded as part of condition processing. */ | |
3334 | ||
3335 | if (level == 0) | |
3336 | { | |
3337 | ss = expand_string(s); | |
3338 | if (ss == NULL) | |
3339 | { | |
3340 | if (expand_string_forcedfail) return OK; | |
3341 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s, | |
3342 | expand_string_message); | |
3343 | return ERROR; | |
3344 | } | |
3345 | } | |
3346 | else ss = s; | |
3347 | ||
3348 | while (isspace(*ss))ss++; | |
3349 | ||
3350 | /* If we can't find a named ACL, the default is to parse it as an inline one. | |
3351 | (Unless it begins with a slash; non-existent files give rise to an error.) */ | |
3352 | ||
3353 | acl_text = ss; | |
3354 | ||
3355 | /* Handle the case of a string that does not contain any spaces. Look for a | |
3356 | named ACL among those read from the configuration, or a previously read file. | |
3357 | It is possible that the pointer to the ACL is NULL if the configuration | |
3358 | contains a name with no data. If not found, and the text begins with '/', | |
3359 | read an ACL from a file, and save it so it can be re-used. */ | |
3360 | ||
3361 | if (Ustrchr(ss, ' ') == NULL) | |
3362 | { | |
3363 | tree_node *t = tree_search(acl_anchor, ss); | |
3364 | if (t != NULL) | |
3365 | { | |
3366 | acl = (acl_block *)(t->data.ptr); | |
3367 | if (acl == NULL) | |
3368 | { | |
3369 | HDEBUG(D_acl) debug_printf("ACL \"%s\" is empty: implicit DENY\n", ss); | |
3370 | return FAIL; | |
3371 | } | |
3372 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
3373 | HDEBUG(D_acl) debug_printf("using ACL \"%s\"\n", ss); | |
3374 | } | |
3375 | ||
3376 | else if (*ss == '/') | |
3377 | { | |
3378 | struct stat statbuf; | |
3379 | fd = Uopen(ss, O_RDONLY, 0); | |
3380 | if (fd < 0) | |
3381 | { | |
3382 | *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss, | |
3383 | strerror(errno)); | |
3384 | return ERROR; | |
3385 | } | |
3386 | ||
3387 | if (fstat(fd, &statbuf) != 0) | |
3388 | { | |
3389 | *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss, | |
3390 | strerror(errno)); | |
3391 | return ERROR; | |
3392 | } | |
3393 | ||
3394 | acl_text = store_get(statbuf.st_size + 1); | |
3395 | acl_text_end = acl_text + statbuf.st_size + 1; | |
3396 | ||
3397 | if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size) | |
3398 | { | |
3399 | *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s", | |
3400 | ss, strerror(errno)); | |
3401 | return ERROR; | |
3402 | } | |
3403 | acl_text[statbuf.st_size] = 0; | |
f1e894f3 | 3404 | (void)close(fd); |
059ec3d9 PH |
3405 | |
3406 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
3407 | HDEBUG(D_acl) debug_printf("read ACL from file %s\n", ss); | |
3408 | } | |
3409 | } | |
3410 | ||
3411 | /* Parse an ACL that is still in text form. If it came from a file, remember it | |
3412 | in the ACL tree, having read it into the POOL_PERM store pool so that it | |
3413 | persists between multiple messages. */ | |
3414 | ||
3415 | if (acl == NULL) | |
3416 | { | |
3417 | int old_pool = store_pool; | |
3418 | if (fd >= 0) store_pool = POOL_PERM; | |
3419 | acl = acl_read(acl_getline, log_msgptr); | |
3420 | store_pool = old_pool; | |
3421 | if (acl == NULL && *log_msgptr != NULL) return ERROR; | |
3422 | if (fd >= 0) | |
3423 | { | |
3424 | tree_node *t = store_get_perm(sizeof(tree_node) + Ustrlen(ss)); | |
3425 | Ustrcpy(t->name, ss); | |
3426 | t->data.ptr = acl; | |
3427 | (void)tree_insertnode(&acl_anchor, t); | |
3428 | } | |
3429 | } | |
3430 | ||
3431 | /* Now we have an ACL to use. It's possible it may be NULL. */ | |
3432 | ||
3433 | while (acl != NULL) | |
3434 | { | |
3435 | int cond; | |
3436 | int basic_errno = 0; | |
3437 | BOOL endpass_seen = FALSE; | |
3438 | ||
3439 | *log_msgptr = *user_msgptr = NULL; | |
3440 | acl_temp_details = FALSE; | |
3441 | ||
3442 | if (where == ACL_WHERE_QUIT && | |
3443 | acl->verb != ACL_ACCEPT && | |
3444 | acl->verb != ACL_WARN) | |
3445 | { | |
3446 | *log_msgptr = string_sprintf("\"%s\" is not allowed in a QUIT ACL", | |
3447 | verbs[acl->verb]); | |
3448 | return ERROR; | |
3449 | } | |
3450 | ||
3451 | HDEBUG(D_acl) debug_printf("processing \"%s\"\n", verbs[acl->verb]); | |
3452 | ||
3453 | /* Clear out any search error message from a previous check before testing | |
3454 | this condition. */ | |
3455 | ||
3456 | search_error_message = NULL; | |
3457 | cond = acl_check_condition(acl->verb, acl->condition, where, addr, level, | |
3458 | &endpass_seen, user_msgptr, log_msgptr, &basic_errno); | |
3459 | ||
3460 | /* Handle special returns: DEFER causes a return except on a WARN verb; | |
3461 | ERROR always causes a return. */ | |
3462 | ||
3463 | switch (cond) | |
3464 | { | |
3465 | case DEFER: | |
3466 | HDEBUG(D_acl) debug_printf("%s: condition test deferred\n", verbs[acl->verb]); | |
3467 | if (basic_errno != ERRNO_CALLOUTDEFER) | |
3468 | { | |
3469 | if (search_error_message != NULL && *search_error_message != 0) | |
3470 | *log_msgptr = search_error_message; | |
3471 | if (smtp_return_error_details) acl_temp_details = TRUE; | |
3472 | } | |
3473 | else | |
3474 | { | |
3475 | acl_temp_details = TRUE; | |
3476 | } | |
3477 | if (acl->verb != ACL_WARN) return DEFER; | |
3478 | break; | |
3479 | ||
3480 | default: /* Paranoia */ | |
3481 | case ERROR: | |
3482 | HDEBUG(D_acl) debug_printf("%s: condition test error\n", verbs[acl->verb]); | |
3483 | return ERROR; | |
3484 | ||
3485 | case OK: | |
3486 | HDEBUG(D_acl) debug_printf("%s: condition test succeeded\n", | |
3487 | verbs[acl->verb]); | |
3488 | break; | |
3489 | ||
3490 | case FAIL: | |
3491 | HDEBUG(D_acl) debug_printf("%s: condition test failed\n", verbs[acl->verb]); | |
3492 | break; | |
3493 | ||
3494 | /* DISCARD and DROP can happen only from a nested ACL condition, and | |
3495 | DISCARD can happen only for an "accept" or "discard" verb. */ | |
3496 | ||
3497 | case DISCARD: | |
3498 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"discard\"\n", | |
3499 | verbs[acl->verb]); | |
3500 | break; | |
3501 | ||
3502 | case FAIL_DROP: | |
3503 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"drop\"\n", | |
3504 | verbs[acl->verb]); | |
3505 | break; | |
3506 | } | |
3507 | ||
3508 | /* At this point, cond for most verbs is either OK or FAIL or (as a result of | |
3509 | a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and | |
3510 | for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */ | |
3511 | ||
3512 | switch(acl->verb) | |
3513 | { | |
3514 | case ACL_ACCEPT: | |
3515 | if (cond == OK || cond == DISCARD) return cond; | |
3516 | if (endpass_seen) | |
3517 | { | |
3518 | HDEBUG(D_acl) debug_printf("accept: endpass encountered - denying access\n"); | |
3519 | return cond; | |
3520 | } | |
3521 | break; | |
3522 | ||
3523 | case ACL_DEFER: | |
3524 | if (cond == OK) | |
3525 | { | |
3526 | acl_temp_details = TRUE; | |
3527 | return DEFER; | |
3528 | } | |
3529 | break; | |
3530 | ||
3531 | case ACL_DENY: | |
3532 | if (cond == OK) return FAIL; | |
3533 | break; | |
3534 | ||
3535 | case ACL_DISCARD: | |
3536 | if (cond == OK || cond == DISCARD) return DISCARD; | |
3537 | if (endpass_seen) | |
3538 | { | |
3539 | HDEBUG(D_acl) debug_printf("discard: endpass encountered - denying access\n"); | |
3540 | return cond; | |
3541 | } | |
3542 | break; | |
3543 | ||
3544 | case ACL_DROP: | |
3545 | if (cond == OK) return FAIL_DROP; | |
3546 | break; | |
3547 | ||
3548 | case ACL_REQUIRE: | |
3549 | if (cond != OK) return cond; | |
3550 | break; | |
3551 | ||
3552 | case ACL_WARN: | |
3553 | if (cond == OK) | |
3554 | acl_warn(where, *user_msgptr, *log_msgptr); | |
49826d12 | 3555 | else if (cond == DEFER && (log_extra_selector & LX_acl_warn_skipped) != 0) |
9c7a242c PH |
3556 | log_write(0, LOG_MAIN, "%s Warning: ACL \"warn\" statement skipped: " |
3557 | "condition test deferred%s%s", host_and_ident(TRUE), | |
3558 | (*log_msgptr == NULL)? US"" : US": ", | |
3559 | (*log_msgptr == NULL)? US"" : *log_msgptr); | |
059ec3d9 PH |
3560 | *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */ |
3561 | break; | |
3562 | ||
3563 | default: | |
3564 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d", | |
3565 | acl->verb); | |
3566 | break; | |
3567 | } | |
3568 | ||
3569 | /* Pass to the next ACL item */ | |
3570 | ||
3571 | acl = acl->next; | |
3572 | } | |
3573 | ||
3574 | /* We have reached the end of the ACL. This is an implicit DENY. */ | |
3575 | ||
3576 | HDEBUG(D_acl) debug_printf("end of %s: implicit DENY\n", acl_name); | |
3577 | return FAIL; | |
3578 | } | |
3579 | ||
3580 | ||
3581 | /************************************************* | |
3582 | * Check access using an ACL * | |
3583 | *************************************************/ | |
3584 | ||
3585 | /* This is the external interface for ACL checks. It sets up an address and the | |
3586 | expansions for $domain and $local_part when called after RCPT, then calls | |
3587 | acl_check_internal() to do the actual work. | |
3588 | ||
3589 | Arguments: | |
3590 | where ACL_WHERE_xxxx indicating where called from | |
64ffc24f | 3591 | recipient RCPT address for RCPT check, else NULL |
059ec3d9 PH |
3592 | s the input string; NULL is the same as an empty ACL => DENY |
3593 | user_msgptr where to put a user error (for SMTP response) | |
3594 | log_msgptr where to put a logging message (not for SMTP response) | |
3595 | ||
3596 | Returns: OK access is granted by an ACCEPT verb | |
3597 | DISCARD access is granted by a DISCARD verb | |
3598 | FAIL access is denied | |
3599 | FAIL_DROP access is denied; drop the connection | |
3600 | DEFER can't tell at the moment | |
3601 | ERROR disaster | |
3602 | */ | |
3603 | ||
3604 | int | |
64ffc24f | 3605 | acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr, |
059ec3d9 PH |
3606 | uschar **log_msgptr) |
3607 | { | |
3608 | int rc; | |
3609 | address_item adb; | |
64ffc24f | 3610 | address_item *addr = NULL; |
059ec3d9 PH |
3611 | |
3612 | *user_msgptr = *log_msgptr = NULL; | |
3613 | sender_verified_failed = NULL; | |
fe0dab11 | 3614 | ratelimiters_cmd = NULL; |
6ea85e9a | 3615 | log_reject_target = LOG_MAIN|LOG_REJECT; |
059ec3d9 PH |
3616 | |
3617 | if (where == ACL_WHERE_RCPT) | |
3618 | { | |
3619 | adb = address_defaults; | |
3620 | addr = &adb; | |
64ffc24f | 3621 | addr->address = recipient; |
059ec3d9 PH |
3622 | if (deliver_split_address(addr) == DEFER) |
3623 | { | |
3624 | *log_msgptr = US"defer in percent_hack_domains check"; | |
3625 | return DEFER; | |
3626 | } | |
3627 | deliver_domain = addr->domain; | |
3628 | deliver_localpart = addr->local_part; | |
3629 | } | |
059ec3d9 PH |
3630 | |
3631 | rc = acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr); | |
3632 | ||
64ffc24f PH |
3633 | deliver_domain = deliver_localpart = deliver_address_data = |
3634 | sender_address_data = NULL; | |
059ec3d9 PH |
3635 | |
3636 | /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA | |
3637 | ACL, which is really in the middle of an SMTP command. */ | |
3638 | ||
3639 | if (rc == DISCARD) | |
3640 | { | |
3641 | if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA) | |
3642 | { | |
3643 | log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s " | |
3644 | "ACL", acl_wherenames[where]); | |
3645 | return ERROR; | |
3646 | } | |
3647 | return DISCARD; | |
3648 | } | |
3649 | ||
3650 | /* A DROP response is not permitted from MAILAUTH */ | |
3651 | ||
3652 | if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH) | |
3653 | { | |
3654 | log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s " | |
3655 | "ACL", acl_wherenames[where]); | |
3656 | return ERROR; | |
3657 | } | |
3658 | ||
4e88a19f PH |
3659 | /* Before giving a response, take a look at the length of any user message, and |
3660 | split it up into multiple lines if possible. */ | |
059ec3d9 | 3661 | |
e28326d8 PH |
3662 | *user_msgptr = string_split_message(*user_msgptr); |
3663 | if (fake_response != OK) | |
3664 | fake_response_text = string_split_message(fake_response_text); | |
059ec3d9 PH |
3665 | |
3666 | return rc; | |
3667 | } | |
3668 | ||
38a0a95f PH |
3669 | |
3670 | ||
3671 | /************************************************* | |
3672 | * Create ACL variable * | |
3673 | *************************************************/ | |
3674 | ||
3675 | /* Create an ACL variable or reuse an existing one. ACL variables are in a | |
3676 | binary tree (see tree.c) with acl_var_c and acl_var_m as root nodes. | |
3677 | ||
3678 | Argument: | |
3679 | name pointer to the variable's name, starting with c or m | |
3680 | ||
3681 | Returns the pointer to variable's tree node | |
3682 | */ | |
3683 | ||
3684 | tree_node * | |
3685 | acl_var_create(uschar *name) | |
3686 | { | |
3687 | tree_node *node, **root; | |
3688 | root = (name[0] == 'c')? &acl_var_c : &acl_var_m; | |
3689 | node = tree_search(*root, name); | |
3690 | if (node == NULL) | |
3691 | { | |
3692 | node = store_get(sizeof(tree_node) + Ustrlen(name)); | |
3693 | Ustrcpy(node->name, name); | |
3694 | (void)tree_insertnode(root, node); | |
3695 | } | |
3696 | node->data.ptr = NULL; | |
3697 | return node; | |
3698 | } | |
3699 | ||
3700 | ||
3701 | ||
3702 | /************************************************* | |
3703 | * Write an ACL variable in spool format * | |
3704 | *************************************************/ | |
3705 | ||
3706 | /* This function is used as a callback for tree_walk when writing variables to | |
3707 | the spool file. To retain spool file compatibility, what is written is -aclc or | |
3708 | -aclm followed by the rest of the name and the data length, space separated, | |
3709 | then the value itself, starting on a new line, and terminated by an additional | |
3710 | newline. When we had only numbered ACL variables, the first line might look | |
3711 | like this: "-aclc 5 20". Now it might be "-aclc foo 20" for the variable called | |
3712 | acl_cfoo. | |
3713 | ||
3714 | Arguments: | |
3715 | name of the variable | |
3716 | value of the variable | |
3717 | ctx FILE pointer (as a void pointer) | |
3718 | ||
3719 | Returns: nothing | |
3720 | */ | |
3721 | ||
3722 | void | |
3723 | acl_var_write(uschar *name, uschar *value, void *ctx) | |
3724 | { | |
3725 | FILE *f = (FILE *)ctx; | |
3726 | fprintf(f, "-acl%c %s %d\n%s\n", name[0], name+1, Ustrlen(value), value); | |
3727 | } | |
3728 | ||
059ec3d9 | 3729 | /* End of acl.c */ |