Commit | Line | Data |
---|---|---|
f7572e5a | 1 | /* $Cambridge: exim/src/src/acl.c,v 1.80 2007/09/28 12:21:57 tom 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 | 176 | #endif |
f7572e5a TK |
177 | #ifdef EXPERIMENTAL_DKIM |
178 | CONTROL_DKIM_VERIFY, | |
179 | #endif | |
c46782ef PH |
180 | CONTROL_ERROR, |
181 | CONTROL_CASEFUL_LOCAL_PART, | |
182 | CONTROL_CASELOWER_LOCAL_PART, | |
183 | CONTROL_ENFORCE_SYNC, | |
184 | CONTROL_NO_ENFORCE_SYNC, | |
185 | CONTROL_FREEZE, | |
186 | CONTROL_QUEUE_ONLY, | |
187 | CONTROL_SUBMISSION, | |
188 | CONTROL_SUPPRESS_LOCAL_FIXUPS, | |
189 | #ifdef WITH_CONTENT_SCAN | |
9a26b6b2 | 190 | CONTROL_NO_MBOX_UNSPOOL, |
c46782ef PH |
191 | #endif |
192 | CONTROL_FAKEDEFER, | |
193 | CONTROL_FAKEREJECT, | |
cf8b11a5 | 194 | CONTROL_NO_MULTILINE, |
047bdd8c | 195 | CONTROL_NO_PIPELINING, |
4c590bd1 PH |
196 | CONTROL_NO_DELAY_FLUSH, |
197 | CONTROL_NO_CALLOUT_FLUSH | |
c46782ef | 198 | }; |
9a26b6b2 | 199 | |
8800895a PH |
200 | /* ACL control names; keep in step with the table above! This list is used for |
201 | turning ids into names. The actual list of recognized names is in the variable | |
202 | control_def controls_list[] below. The fact that there are two lists is a mess | |
203 | and should be tidied up. */ | |
9a26b6b2 PH |
204 | |
205 | static uschar *controls[] = { | |
c46782ef | 206 | US"allow_auth_unadvertised", |
9a26b6b2 PH |
207 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
208 | US"bmi_run", | |
209 | #endif | |
210 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
211 | US"dk_verify", | |
212 | #endif | |
f7572e5a TK |
213 | #ifdef EXPERIMENTAL_DKIM |
214 | US"dkim_verify", | |
215 | #endif | |
c46782ef PH |
216 | US"error", |
217 | US"caseful_local_part", | |
218 | US"caselower_local_part", | |
219 | US"enforce_sync", | |
220 | US"no_enforce_sync", | |
221 | US"freeze", | |
222 | US"queue_only", | |
223 | US"submission", | |
224 | US"suppress_local_fixups", | |
9a26b6b2 PH |
225 | #ifdef WITH_CONTENT_SCAN |
226 | US"no_mbox_unspool", | |
227 | #endif | |
cf8b11a5 PH |
228 | US"fakedefer", |
229 | US"fakereject", | |
aa6dc513 | 230 | US"no_multiline_responses", |
cf8b11a5 | 231 | US"no_pipelining", |
4c590bd1 PH |
232 | US"no_delay_flush", |
233 | US"no_callout_flush" | |
c46782ef | 234 | }; |
059ec3d9 | 235 | |
047bdd8c | 236 | /* Flags to indicate for which conditions/modifiers a string expansion is done |
059ec3d9 PH |
237 | at the outer level. In the other cases, expansion already occurs in the |
238 | checking functions. */ | |
239 | ||
240 | static uschar cond_expand_at_top[] = { | |
241 | TRUE, /* acl */ | |
3e536984 | 242 | TRUE, /* add_header */ |
059ec3d9 | 243 | FALSE, /* authenticated */ |
8523533c TK |
244 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
245 | TRUE, /* bmi_optin */ | |
8e669ac1 | 246 | #endif |
059ec3d9 | 247 | TRUE, /* condition */ |
c3611384 | 248 | TRUE, /* continue */ |
059ec3d9 | 249 | TRUE, /* control */ |
8523533c TK |
250 | #ifdef WITH_CONTENT_SCAN |
251 | TRUE, /* decode */ | |
252 | #endif | |
059ec3d9 | 253 | TRUE, /* delay */ |
8523533c TK |
254 | #ifdef WITH_OLD_DEMIME |
255 | TRUE, /* demime */ | |
fb2274d4 TK |
256 | #endif |
257 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
7f45268c PH |
258 | TRUE, /* dk_domain_source */ |
259 | TRUE, /* dk_policy */ | |
260 | TRUE, /* dk_sender_domains */ | |
e715ad22 | 261 | TRUE, /* dk_sender_local_parts */ |
7f45268c PH |
262 | TRUE, /* dk_senders */ |
263 | TRUE, /* dk_status */ | |
8523533c | 264 | #endif |
059ec3d9 PH |
265 | TRUE, /* dnslists */ |
266 | FALSE, /* domains */ | |
267 | FALSE, /* encrypted */ | |
268 | TRUE, /* endpass */ | |
269 | FALSE, /* hosts */ | |
270 | FALSE, /* local_parts */ | |
271 | TRUE, /* log_message */ | |
6ea85e9a | 272 | TRUE, /* log_reject_target */ |
059ec3d9 | 273 | TRUE, /* logwrite */ |
8523533c TK |
274 | #ifdef WITH_CONTENT_SCAN |
275 | TRUE, /* malware */ | |
276 | #endif | |
059ec3d9 | 277 | TRUE, /* message */ |
8523533c TK |
278 | #ifdef WITH_CONTENT_SCAN |
279 | TRUE, /* mime_regex */ | |
280 | #endif | |
870f6ba8 | 281 | TRUE, /* ratelimit */ |
059ec3d9 | 282 | FALSE, /* recipients */ |
8523533c TK |
283 | #ifdef WITH_CONTENT_SCAN |
284 | TRUE, /* regex */ | |
285 | #endif | |
059ec3d9 PH |
286 | FALSE, /* sender_domains */ |
287 | FALSE, /* senders */ | |
288 | TRUE, /* set */ | |
8523533c TK |
289 | #ifdef WITH_CONTENT_SCAN |
290 | TRUE, /* spam */ | |
291 | #endif | |
292 | #ifdef EXPERIMENTAL_SPF | |
293 | TRUE, /* spf */ | |
294 | #endif | |
059ec3d9 PH |
295 | TRUE /* verify */ |
296 | }; | |
297 | ||
298 | /* Flags to identify the modifiers */ | |
299 | ||
300 | static uschar cond_modifiers[] = { | |
301 | FALSE, /* acl */ | |
3e536984 | 302 | TRUE, /* add_header */ |
059ec3d9 | 303 | FALSE, /* authenticated */ |
8523533c TK |
304 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
305 | TRUE, /* bmi_optin */ | |
8e669ac1 | 306 | #endif |
059ec3d9 | 307 | FALSE, /* condition */ |
c3611384 | 308 | TRUE, /* continue */ |
059ec3d9 | 309 | TRUE, /* control */ |
8523533c TK |
310 | #ifdef WITH_CONTENT_SCAN |
311 | FALSE, /* decode */ | |
312 | #endif | |
059ec3d9 | 313 | TRUE, /* delay */ |
8523533c TK |
314 | #ifdef WITH_OLD_DEMIME |
315 | FALSE, /* demime */ | |
fb2274d4 TK |
316 | #endif |
317 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
7f45268c PH |
318 | FALSE, /* dk_domain_source */ |
319 | FALSE, /* dk_policy */ | |
320 | FALSE, /* dk_sender_domains */ | |
e715ad22 | 321 | FALSE, /* dk_sender_local_parts */ |
7f45268c PH |
322 | FALSE, /* dk_senders */ |
323 | FALSE, /* dk_status */ | |
8523533c | 324 | #endif |
059ec3d9 PH |
325 | FALSE, /* dnslists */ |
326 | FALSE, /* domains */ | |
327 | FALSE, /* encrypted */ | |
328 | TRUE, /* endpass */ | |
329 | FALSE, /* hosts */ | |
330 | FALSE, /* local_parts */ | |
331 | TRUE, /* log_message */ | |
6ea85e9a | 332 | TRUE, /* log_reject_target */ |
8523533c TK |
333 | TRUE, /* logwrite */ |
334 | #ifdef WITH_CONTENT_SCAN | |
335 | FALSE, /* malware */ | |
336 | #endif | |
059ec3d9 | 337 | TRUE, /* message */ |
8523533c TK |
338 | #ifdef WITH_CONTENT_SCAN |
339 | FALSE, /* mime_regex */ | |
340 | #endif | |
870f6ba8 | 341 | FALSE, /* ratelimit */ |
059ec3d9 | 342 | FALSE, /* recipients */ |
8523533c TK |
343 | #ifdef WITH_CONTENT_SCAN |
344 | FALSE, /* regex */ | |
345 | #endif | |
059ec3d9 PH |
346 | FALSE, /* sender_domains */ |
347 | FALSE, /* senders */ | |
348 | TRUE, /* set */ | |
8523533c TK |
349 | #ifdef WITH_CONTENT_SCAN |
350 | FALSE, /* spam */ | |
351 | #endif | |
352 | #ifdef EXPERIMENTAL_SPF | |
353 | FALSE, /* spf */ | |
354 | #endif | |
059ec3d9 PH |
355 | FALSE /* verify */ |
356 | }; | |
357 | ||
c3611384 | 358 | /* Bit map vector of which conditions and modifiers are not allowed at certain |
8f128379 PH |
359 | times. For each condition and modifier, there's a bitmap of dis-allowed times. |
360 | For some, it is easier to specify the negation of a small number of allowed | |
361 | times. */ | |
059ec3d9 PH |
362 | |
363 | static unsigned int cond_forbids[] = { | |
364 | 0, /* acl */ | |
8e669ac1 | 365 | |
71fafd95 | 366 | (unsigned int) |
45b91596 | 367 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* add_header */ |
71fafd95 | 368 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
45b91596 PH |
369 | (1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)| |
370 | (1<<ACL_WHERE_NOTSMTP_START)), | |
71fafd95 | 371 | |
45b91596 PH |
372 | (1<<ACL_WHERE_NOTSMTP)| /* authenticated */ |
373 | (1<<ACL_WHERE_NOTSMTP_START)| | |
374 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO), | |
8e669ac1 | 375 | |
71fafd95 | 376 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
3864bb8e | 377 | (1<<ACL_WHERE_AUTH)| /* bmi_optin */ |
8523533c TK |
378 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
379 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_MIME)| | |
8e669ac1 | 380 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
8523533c TK |
381 | (1<<ACL_WHERE_MAILAUTH)| |
382 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 PH |
383 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_PREDATA)| |
384 | (1<<ACL_WHERE_NOTSMTP_START), | |
71fafd95 | 385 | #endif |
8e669ac1 | 386 | |
059ec3d9 | 387 | 0, /* condition */ |
8e669ac1 | 388 | |
c3611384 PH |
389 | 0, /* continue */ |
390 | ||
059ec3d9 | 391 | /* Certain types of control are always allowed, so we let it through |
2f079f46 | 392 | always and check in the control processing itself. */ |
8e669ac1 | 393 | |
059ec3d9 | 394 | 0, /* control */ |
8e669ac1 | 395 | |
71fafd95 | 396 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
397 | (unsigned int) |
398 | ~(1<<ACL_WHERE_MIME), /* decode */ | |
71fafd95 | 399 | #endif |
8523533c | 400 | |
8f128379 | 401 | (1<<ACL_WHERE_NOTQUIT), /* delay */ |
8e669ac1 | 402 | |
71fafd95 | 403 | #ifdef WITH_OLD_DEMIME |
2f079f46 PH |
404 | (unsigned int) |
405 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* demime */ | |
71fafd95 | 406 | #endif |
8e669ac1 | 407 | |
71fafd95 | 408 | #ifdef EXPERIMENTAL_DOMAINKEYS |
2f079f46 | 409 | (1<<ACL_WHERE_AUTH)| /* dk_domain_source */ |
fb2274d4 TK |
410 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
411 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
412 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
413 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
414 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 415 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 416 | |
2f079f46 | 417 | (1<<ACL_WHERE_AUTH)| /* dk_policy */ |
fb2274d4 TK |
418 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
419 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
420 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
421 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
422 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 423 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 424 | |
2f079f46 | 425 | (1<<ACL_WHERE_AUTH)| /* dk_sender_domains */ |
fb2274d4 TK |
426 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
427 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
428 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
429 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
430 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 431 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 432 | |
2f079f46 | 433 | (1<<ACL_WHERE_AUTH)| /* dk_sender_local_parts */ |
fb2274d4 TK |
434 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
435 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
436 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
437 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
438 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 439 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 440 | |
2f079f46 | 441 | (1<<ACL_WHERE_AUTH)| /* dk_senders */ |
fb2274d4 TK |
442 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
443 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
444 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
445 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
446 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 447 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
84330b7b | 448 | |
2f079f46 | 449 | (1<<ACL_WHERE_AUTH)| /* dk_status */ |
fb2274d4 TK |
450 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
451 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
452 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
453 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
454 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 | 455 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_NOTSMTP_START), |
71fafd95 | 456 | #endif |
fb2274d4 | 457 | |
45b91596 PH |
458 | (1<<ACL_WHERE_NOTSMTP)| /* dnslists */ |
459 | (1<<ACL_WHERE_NOTSMTP_START), | |
059ec3d9 | 460 | |
2f079f46 PH |
461 | (unsigned int) |
462 | ~(1<<ACL_WHERE_RCPT), /* domains */ | |
059ec3d9 | 463 | |
45b91596 PH |
464 | (1<<ACL_WHERE_NOTSMTP)| /* encrypted */ |
465 | (1<<ACL_WHERE_CONNECT)| | |
466 | (1<<ACL_WHERE_NOTSMTP_START)| | |
059ec3d9 | 467 | (1<<ACL_WHERE_HELO), |
8e669ac1 | 468 | |
059ec3d9 | 469 | 0, /* endpass */ |
8e669ac1 | 470 | |
45b91596 PH |
471 | (1<<ACL_WHERE_NOTSMTP)| /* hosts */ |
472 | (1<<ACL_WHERE_NOTSMTP_START), | |
059ec3d9 | 473 | |
2f079f46 PH |
474 | (unsigned int) |
475 | ~(1<<ACL_WHERE_RCPT), /* local_parts */ | |
059ec3d9 PH |
476 | |
477 | 0, /* log_message */ | |
8e669ac1 | 478 | |
6ea85e9a PH |
479 | 0, /* log_reject_target */ |
480 | ||
059ec3d9 | 481 | 0, /* logwrite */ |
8e669ac1 | 482 | |
71fafd95 | 483 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
484 | (unsigned int) |
485 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* malware */ | |
71fafd95 | 486 | #endif |
8523533c | 487 | |
059ec3d9 PH |
488 | 0, /* message */ |
489 | ||
71fafd95 | 490 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
491 | (unsigned int) |
492 | ~(1<<ACL_WHERE_MIME), /* mime_regex */ | |
71fafd95 | 493 | #endif |
8523533c | 494 | |
870f6ba8 TF |
495 | 0, /* ratelimit */ |
496 | ||
2f079f46 PH |
497 | (unsigned int) |
498 | ~(1<<ACL_WHERE_RCPT), /* recipients */ | |
059ec3d9 | 499 | |
71fafd95 | 500 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
501 | (unsigned int) |
502 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* regex */ | |
503 | (1<<ACL_WHERE_MIME)), | |
71fafd95 | 504 | #endif |
8523533c | 505 | |
059ec3d9 PH |
506 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* sender_domains */ |
507 | (1<<ACL_WHERE_HELO)| | |
508 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
509 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
510 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
511 | ||
512 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* senders */ | |
513 | (1<<ACL_WHERE_HELO)| | |
514 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
515 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
516 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
517 | ||
518 | 0, /* set */ | |
519 | ||
71fafd95 | 520 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
521 | (unsigned int) |
522 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* spam */ | |
71fafd95 | 523 | #endif |
8523533c | 524 | |
71fafd95 | 525 | #ifdef EXPERIMENTAL_SPF |
8523533c TK |
526 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf */ |
527 | (1<<ACL_WHERE_HELO)| | |
528 | (1<<ACL_WHERE_MAILAUTH)| | |
529 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
45b91596 PH |
530 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY)| |
531 | (1<<ACL_WHERE_NOTSMTP)| | |
532 | (1<<ACL_WHERE_NOTSMTP_START), | |
71fafd95 | 533 | #endif |
8523533c | 534 | |
059ec3d9 PH |
535 | /* Certain types of verify are always allowed, so we let it through |
536 | always and check in the verify function itself */ | |
537 | ||
538 | 0 /* verify */ | |
059ec3d9 PH |
539 | }; |
540 | ||
541 | ||
c5fcb476 PH |
542 | /* Bit map vector of which controls are not allowed at certain times. For |
543 | each control, there's a bitmap of dis-allowed times. For some, it is easier to | |
544 | specify the negation of a small number of allowed times. */ | |
545 | ||
546 | static unsigned int control_forbids[] = { | |
c46782ef PH |
547 | (unsigned int) |
548 | ~((1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)), /* allow_auth_unadvertised */ | |
549 | ||
550 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
8523533c | 551 | 0, /* bmi_run */ |
c46782ef PH |
552 | #endif |
553 | ||
554 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
45b91596 PH |
555 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dk_verify */ |
556 | (1<<ACL_WHERE_NOTSMTP_START), | |
c46782ef | 557 | #endif |
3e11c26b | 558 | |
f7572e5a TK |
559 | #ifdef EXPERIMENTAL_DKIM |
560 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dkim_verify */ | |
561 | (1<<ACL_WHERE_NOTSMTP_START), | |
562 | #endif | |
563 | ||
c5fcb476 | 564 | 0, /* error */ |
8e669ac1 PH |
565 | |
566 | (unsigned int) | |
c5fcb476 | 567 | ~(1<<ACL_WHERE_RCPT), /* caseful_local_part */ |
8e669ac1 PH |
568 | |
569 | (unsigned int) | |
c5fcb476 | 570 | ~(1<<ACL_WHERE_RCPT), /* caselower_local_part */ |
8e669ac1 | 571 | |
45b91596 PH |
572 | (1<<ACL_WHERE_NOTSMTP)| /* enforce_sync */ |
573 | (1<<ACL_WHERE_NOTSMTP_START), | |
8e669ac1 | 574 | |
45b91596 PH |
575 | (1<<ACL_WHERE_NOTSMTP)| /* no_enforce_sync */ |
576 | (1<<ACL_WHERE_NOTSMTP_START), | |
8e669ac1 PH |
577 | |
578 | (unsigned int) | |
c5fcb476 PH |
579 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* freeze */ |
580 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
e715ad22 | 581 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
582 | |
583 | (unsigned int) | |
c5fcb476 PH |
584 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* queue_only */ |
585 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
e715ad22 | 586 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
587 | |
588 | (unsigned int) | |
c5fcb476 | 589 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* submission */ |
8e669ac1 | 590 | (1<<ACL_WHERE_PREDATA)), |
8523533c | 591 | |
8800895a PH |
592 | (unsigned int) |
593 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* suppress_local_fixups */ | |
45b91596 PH |
594 | (1<<ACL_WHERE_PREDATA)| |
595 | (1<<ACL_WHERE_NOTSMTP_START)), | |
8800895a | 596 | |
c46782ef | 597 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 598 | (unsigned int) |
14d57970 | 599 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* no_mbox_unspool */ |
e715ad22 TK |
600 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
601 | (1<<ACL_WHERE_MIME)), | |
c46782ef | 602 | #endif |
a6c4ab60 | 603 | |
29aba418 TF |
604 | (unsigned int) |
605 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakedefer */ | |
606 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
607 | (1<<ACL_WHERE_MIME)), | |
608 | ||
8e669ac1 | 609 | (unsigned int) |
a6c4ab60 | 610 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakereject */ |
e715ad22 TK |
611 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
612 | (1<<ACL_WHERE_MIME)), | |
8523533c | 613 | |
45b91596 | 614 | (1<<ACL_WHERE_NOTSMTP)| /* no_multiline */ |
cf8b11a5 PH |
615 | (1<<ACL_WHERE_NOTSMTP_START), |
616 | ||
617 | (1<<ACL_WHERE_NOTSMTP)| /* no_pipelining */ | |
047bdd8c PH |
618 | (1<<ACL_WHERE_NOTSMTP_START), |
619 | ||
620 | (1<<ACL_WHERE_NOTSMTP)| /* no_delay_flush */ | |
4c590bd1 PH |
621 | (1<<ACL_WHERE_NOTSMTP_START), |
622 | ||
623 | (1<<ACL_WHERE_NOTSMTP)| /* no_callout_flush */ | |
45b91596 | 624 | (1<<ACL_WHERE_NOTSMTP_START) |
c5fcb476 PH |
625 | }; |
626 | ||
627 | /* Structure listing various control arguments, with their characteristics. */ | |
059ec3d9 PH |
628 | |
629 | typedef struct control_def { | |
630 | uschar *name; | |
631 | int value; /* CONTROL_xxx value */ | |
059ec3d9 PH |
632 | BOOL has_option; /* Has /option(s) following */ |
633 | } control_def; | |
634 | ||
635 | static control_def controls_list[] = { | |
c46782ef | 636 | { US"allow_auth_unadvertised", CONTROL_AUTH_UNADVERTISED, FALSE }, |
8523533c | 637 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
c46782ef | 638 | { US"bmi_run", CONTROL_BMI_RUN, FALSE }, |
fb2274d4 TK |
639 | #endif |
640 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
c46782ef | 641 | { US"dk_verify", CONTROL_DK_VERIFY, FALSE }, |
f7572e5a TK |
642 | #endif |
643 | #ifdef EXPERIMENTAL_DKIM | |
644 | { US"dkim_verify", CONTROL_DKIM_VERIFY, FALSE }, | |
8523533c | 645 | #endif |
c46782ef PH |
646 | { US"caseful_local_part", CONTROL_CASEFUL_LOCAL_PART, FALSE }, |
647 | { US"caselower_local_part", CONTROL_CASELOWER_LOCAL_PART, FALSE }, | |
648 | { US"enforce_sync", CONTROL_ENFORCE_SYNC, FALSE }, | |
649 | { US"freeze", CONTROL_FREEZE, TRUE }, | |
4c590bd1 | 650 | { US"no_callout_flush", CONTROL_NO_CALLOUT_FLUSH, FALSE }, |
047bdd8c | 651 | { US"no_delay_flush", CONTROL_NO_DELAY_FLUSH, FALSE }, |
c46782ef PH |
652 | { US"no_enforce_sync", CONTROL_NO_ENFORCE_SYNC, FALSE }, |
653 | { US"no_multiline_responses", CONTROL_NO_MULTILINE, FALSE }, | |
cf8b11a5 | 654 | { US"no_pipelining", CONTROL_NO_PIPELINING, FALSE }, |
c46782ef | 655 | { US"queue_only", CONTROL_QUEUE_ONLY, FALSE }, |
8523533c | 656 | #ifdef WITH_CONTENT_SCAN |
c46782ef | 657 | { US"no_mbox_unspool", CONTROL_NO_MBOX_UNSPOOL, FALSE }, |
8523533c | 658 | #endif |
c46782ef PH |
659 | { US"fakedefer", CONTROL_FAKEDEFER, TRUE }, |
660 | { US"fakereject", CONTROL_FAKEREJECT, TRUE }, | |
661 | { US"submission", CONTROL_SUBMISSION, TRUE }, | |
662 | { US"suppress_local_fixups", CONTROL_SUPPRESS_LOCAL_FIXUPS, FALSE } | |
059ec3d9 PH |
663 | }; |
664 | ||
e5a9dba6 PH |
665 | /* Support data structures for Client SMTP Authorization. acl_verify_csa() |
666 | caches its result in a tree to avoid repeated DNS queries. The result is an | |
667 | integer code which is used as an index into the following tables of | |
668 | explanatory strings and verification return codes. */ | |
669 | ||
670 | static tree_node *csa_cache = NULL; | |
671 | ||
672 | enum { CSA_UNKNOWN, CSA_OK, CSA_DEFER_SRV, CSA_DEFER_ADDR, | |
673 | CSA_FAIL_EXPLICIT, CSA_FAIL_DOMAIN, CSA_FAIL_NOADDR, CSA_FAIL_MISMATCH }; | |
674 | ||
675 | /* The acl_verify_csa() return code is translated into an acl_verify() return | |
676 | code using the following table. It is OK unless the client is definitely not | |
677 | authorized. This is because CSA is supposed to be optional for sending sites, | |
678 | so recipients should not be too strict about checking it - especially because | |
679 | DNS problems are quite likely to occur. It's possible to use $csa_status in | |
680 | further ACL conditions to distinguish ok, unknown, and defer if required, but | |
681 | the aim is to make the usual configuration simple. */ | |
682 | ||
683 | static int csa_return_code[] = { | |
684 | OK, OK, OK, OK, | |
685 | FAIL, FAIL, FAIL, FAIL | |
686 | }; | |
687 | ||
688 | static uschar *csa_status_string[] = { | |
689 | US"unknown", US"ok", US"defer", US"defer", | |
690 | US"fail", US"fail", US"fail", US"fail" | |
691 | }; | |
692 | ||
693 | static uschar *csa_reason_string[] = { | |
694 | US"unknown", | |
695 | US"ok", | |
696 | US"deferred (SRV lookup failed)", | |
697 | US"deferred (target address lookup failed)", | |
698 | US"failed (explicit authorization required)", | |
699 | US"failed (host name not authorized)", | |
700 | US"failed (no authorized addresses)", | |
701 | US"failed (client address mismatch)" | |
702 | }; | |
703 | ||
059ec3d9 PH |
704 | /* Enable recursion between acl_check_internal() and acl_check_condition() */ |
705 | ||
706 | static int acl_check_internal(int, address_item *, uschar *, int, uschar **, | |
707 | uschar **); | |
708 | ||
709 | ||
710 | /************************************************* | |
711 | * Pick out name from list * | |
712 | *************************************************/ | |
713 | ||
714 | /* Use a binary chop method | |
715 | ||
716 | Arguments: | |
717 | name name to find | |
718 | list list of names | |
719 | end size of list | |
720 | ||
721 | Returns: offset in list, or -1 if not found | |
722 | */ | |
723 | ||
724 | static int | |
725 | acl_checkname(uschar *name, uschar **list, int end) | |
726 | { | |
727 | int start = 0; | |
728 | ||
729 | while (start < end) | |
730 | { | |
731 | int mid = (start + end)/2; | |
732 | int c = Ustrcmp(name, list[mid]); | |
733 | if (c == 0) return mid; | |
734 | if (c < 0) end = mid; else start = mid + 1; | |
735 | } | |
736 | ||
737 | return -1; | |
738 | } | |
739 | ||
740 | ||
741 | /************************************************* | |
742 | * Read and parse one ACL * | |
743 | *************************************************/ | |
744 | ||
745 | /* This function is called both from readconf in order to parse the ACLs in the | |
746 | configuration file, and also when an ACL is encountered dynamically (e.g. as | |
747 | the result of an expansion). It is given a function to call in order to | |
748 | retrieve the lines of the ACL. This function handles skipping comments and | |
749 | blank lines (where relevant). | |
750 | ||
751 | Arguments: | |
752 | func function to get next line of ACL | |
753 | error where to put an error message | |
754 | ||
755 | Returns: pointer to ACL, or NULL | |
756 | NULL can be legal (empty ACL); in this case error will be NULL | |
757 | */ | |
758 | ||
759 | acl_block * | |
760 | acl_read(uschar *(*func)(void), uschar **error) | |
761 | { | |
762 | acl_block *yield = NULL; | |
763 | acl_block **lastp = &yield; | |
764 | acl_block *this = NULL; | |
765 | acl_condition_block *cond; | |
766 | acl_condition_block **condp = NULL; | |
767 | uschar *s; | |
768 | ||
769 | *error = NULL; | |
770 | ||
771 | while ((s = (*func)()) != NULL) | |
772 | { | |
773 | int v, c; | |
774 | BOOL negated = FALSE; | |
775 | uschar *saveline = s; | |
776 | uschar name[64]; | |
777 | ||
778 | /* Conditions (but not verbs) are allowed to be negated by an initial | |
779 | exclamation mark. */ | |
780 | ||
781 | while (isspace(*s)) s++; | |
782 | if (*s == '!') | |
783 | { | |
784 | negated = TRUE; | |
785 | s++; | |
786 | } | |
787 | ||
cf00dad6 PH |
788 | /* Read the name of a verb or a condition, or the start of a new ACL, which |
789 | can be started by a name, or by a macro definition. */ | |
059ec3d9 PH |
790 | |
791 | s = readconf_readname(name, sizeof(name), s); | |
b8dc3e4a | 792 | if (*s == ':' || (isupper(name[0]) && *s == '=')) return yield; |
059ec3d9 PH |
793 | |
794 | /* If a verb is unrecognized, it may be another condition or modifier that | |
795 | continues the previous verb. */ | |
796 | ||
797 | v = acl_checkname(name, verbs, sizeof(verbs)/sizeof(char *)); | |
798 | if (v < 0) | |
799 | { | |
800 | if (this == NULL) | |
801 | { | |
4e167a8c PH |
802 | *error = string_sprintf("unknown ACL verb \"%s\" in \"%s\"", name, |
803 | saveline); | |
059ec3d9 PH |
804 | return NULL; |
805 | } | |
806 | } | |
807 | ||
808 | /* New verb */ | |
809 | ||
810 | else | |
811 | { | |
812 | if (negated) | |
813 | { | |
814 | *error = string_sprintf("malformed ACL line \"%s\"", saveline); | |
815 | return NULL; | |
816 | } | |
817 | this = store_get(sizeof(acl_block)); | |
818 | *lastp = this; | |
819 | lastp = &(this->next); | |
820 | this->next = NULL; | |
821 | this->verb = v; | |
822 | this->condition = NULL; | |
823 | condp = &(this->condition); | |
824 | if (*s == 0) continue; /* No condition on this line */ | |
825 | if (*s == '!') | |
826 | { | |
827 | negated = TRUE; | |
828 | s++; | |
829 | } | |
830 | s = readconf_readname(name, sizeof(name), s); /* Condition name */ | |
831 | } | |
832 | ||
833 | /* Handle a condition or modifier. */ | |
834 | ||
835 | c = acl_checkname(name, conditions, sizeof(conditions)/sizeof(char *)); | |
836 | if (c < 0) | |
837 | { | |
838 | *error = string_sprintf("unknown ACL condition/modifier in \"%s\"", | |
839 | saveline); | |
840 | return NULL; | |
841 | } | |
842 | ||
843 | /* The modifiers may not be negated */ | |
844 | ||
845 | if (negated && cond_modifiers[c]) | |
846 | { | |
847 | *error = string_sprintf("ACL error: negation is not allowed with " | |
848 | "\"%s\"", conditions[c]); | |
849 | return NULL; | |
850 | } | |
851 | ||
852 | /* ENDPASS may occur only with ACCEPT or DISCARD. */ | |
853 | ||
854 | if (c == ACLC_ENDPASS && | |
855 | this->verb != ACL_ACCEPT && | |
856 | this->verb != ACL_DISCARD) | |
857 | { | |
858 | *error = string_sprintf("ACL error: \"%s\" is not allowed with \"%s\"", | |
859 | conditions[c], verbs[this->verb]); | |
860 | return NULL; | |
861 | } | |
862 | ||
863 | cond = store_get(sizeof(acl_condition_block)); | |
864 | cond->next = NULL; | |
865 | cond->type = c; | |
866 | cond->u.negated = negated; | |
867 | ||
868 | *condp = cond; | |
869 | condp = &(cond->next); | |
870 | ||
871 | /* The "set" modifier is different in that its argument is "name=value" | |
872 | rather than just a value, and we can check the validity of the name, which | |
38a0a95f PH |
873 | gives us a variable name to insert into the data block. The original ACL |
874 | variable names were acl_c0 ... acl_c9 and acl_m0 ... acl_m9. This was | |
875 | extended to 20 of each type, but after that people successfully argued for | |
641cb756 PH |
876 | arbitrary names. In the new scheme, the names must start with acl_c or acl_m. |
877 | After that, we allow alphanumerics and underscores, but the first character | |
878 | after c or m must be a digit or an underscore. This retains backwards | |
879 | compatibility. */ | |
059ec3d9 PH |
880 | |
881 | if (c == ACLC_SET) | |
882 | { | |
47ca6d6c PH |
883 | uschar *endptr; |
884 | ||
38a0a95f PH |
885 | if (Ustrncmp(s, "acl_c", 5) != 0 && |
886 | Ustrncmp(s, "acl_m", 5) != 0) | |
47ca6d6c | 887 | { |
38a0a95f PH |
888 | *error = string_sprintf("invalid variable name after \"set\" in ACL " |
889 | "modifier \"set %s\" (must start \"acl_c\" or \"acl_m\")", s); | |
890 | return NULL; | |
47ca6d6c | 891 | } |
38a0a95f PH |
892 | |
893 | endptr = s + 5; | |
641cb756 PH |
894 | if (!isdigit(*endptr) && *endptr != '_') |
895 | { | |
896 | *error = string_sprintf("invalid variable name after \"set\" in ACL " | |
897 | "modifier \"set %s\" (digit or underscore must follow acl_c or acl_m)", | |
898 | s); | |
899 | return NULL; | |
900 | } | |
901 | ||
38a0a95f | 902 | while (*endptr != 0 && *endptr != '=' && !isspace(*endptr)) |
47ca6d6c | 903 | { |
38a0a95f PH |
904 | if (!isalnum(*endptr) && *endptr != '_') |
905 | { | |
906 | *error = string_sprintf("invalid character \"%c\" in variable name " | |
907 | "in ACL modifier \"set %s\"", *endptr, s); | |
908 | return NULL; | |
909 | } | |
910 | endptr++; | |
47ca6d6c | 911 | } |
47ca6d6c | 912 | |
38a0a95f | 913 | cond->u.varname = string_copyn(s + 4, endptr - s - 4); |
47ca6d6c | 914 | s = endptr; |
059ec3d9 PH |
915 | while (isspace(*s)) s++; |
916 | } | |
917 | ||
918 | /* For "set", we are now positioned for the data. For the others, only | |
919 | "endpass" has no data */ | |
920 | ||
921 | if (c != ACLC_ENDPASS) | |
922 | { | |
923 | if (*s++ != '=') | |
924 | { | |
925 | *error = string_sprintf("\"=\" missing after ACL \"%s\" %s", name, | |
926 | cond_modifiers[c]? US"modifier" : US"condition"); | |
927 | return NULL; | |
928 | } | |
929 | while (isspace(*s)) s++; | |
930 | cond->arg = string_copy(s); | |
931 | } | |
932 | } | |
933 | ||
934 | return yield; | |
935 | } | |
936 | ||
937 | ||
938 | ||
71fafd95 PH |
939 | /************************************************* |
940 | * Set up added header line(s) * | |
941 | *************************************************/ | |
942 | ||
943 | /* This function is called by the add_header modifier, and also from acl_warn() | |
944 | to implement the now-deprecated way of adding header lines using "message" on a | |
945 | "warn" verb. The argument is treated as a sequence of header lines which are | |
946 | added to a chain, provided there isn't an identical one already there. | |
947 | ||
948 | Argument: string of header lines | |
949 | Returns: nothing | |
950 | */ | |
951 | ||
952 | static void | |
953 | setup_header(uschar *hstring) | |
954 | { | |
955 | uschar *p, *q; | |
956 | int hlen = Ustrlen(hstring); | |
957 | ||
958 | /* An empty string does nothing; otherwise add a final newline if necessary. */ | |
959 | ||
960 | if (hlen <= 0) return; | |
961 | if (hstring[hlen-1] != '\n') hstring = string_sprintf("%s\n", hstring); | |
962 | ||
963 | /* Loop for multiple header lines, taking care about continuations */ | |
964 | ||
965 | for (p = q = hstring; *p != 0; ) | |
966 | { | |
967 | uschar *s; | |
968 | int newtype = htype_add_bot; | |
969 | header_line **hptr = &acl_added_headers; | |
970 | ||
971 | /* Find next header line within the string */ | |
972 | ||
973 | for (;;) | |
974 | { | |
975 | q = Ustrchr(q, '\n'); | |
976 | if (*(++q) != ' ' && *q != '\t') break; | |
977 | } | |
978 | ||
979 | /* If the line starts with a colon, interpret the instruction for where to | |
980 | add it. This temporarily sets up a new type. */ | |
981 | ||
982 | if (*p == ':') | |
983 | { | |
984 | if (strncmpic(p, US":after_received:", 16) == 0) | |
985 | { | |
986 | newtype = htype_add_rec; | |
987 | p += 16; | |
988 | } | |
989 | else if (strncmpic(p, US":at_start_rfc:", 14) == 0) | |
990 | { | |
991 | newtype = htype_add_rfc; | |
992 | p += 14; | |
993 | } | |
994 | else if (strncmpic(p, US":at_start:", 10) == 0) | |
995 | { | |
996 | newtype = htype_add_top; | |
997 | p += 10; | |
998 | } | |
999 | else if (strncmpic(p, US":at_end:", 8) == 0) | |
1000 | { | |
1001 | newtype = htype_add_bot; | |
1002 | p += 8; | |
1003 | } | |
1004 | while (*p == ' ' || *p == '\t') p++; | |
1005 | } | |
1006 | ||
1007 | /* See if this line starts with a header name, and if not, add X-ACL-Warn: | |
1008 | to the front of it. */ | |
1009 | ||
1010 | for (s = p; s < q - 1; s++) | |
1011 | { | |
1012 | if (*s == ':' || !isgraph(*s)) break; | |
1013 | } | |
1014 | ||
1015 | s = string_sprintf("%s%.*s", (*s == ':')? "" : "X-ACL-Warn: ", q - p, p); | |
1016 | hlen = Ustrlen(s); | |
1017 | ||
1018 | /* See if this line has already been added */ | |
1019 | ||
1020 | while (*hptr != NULL) | |
1021 | { | |
1022 | if (Ustrncmp((*hptr)->text, s, hlen) == 0) break; | |
1023 | hptr = &((*hptr)->next); | |
1024 | } | |
1025 | ||
1026 | /* Add if not previously present */ | |
1027 | ||
1028 | if (*hptr == NULL) | |
1029 | { | |
1030 | header_line *h = store_get(sizeof(header_line)); | |
1031 | h->text = s; | |
1032 | h->next = NULL; | |
1033 | h->type = newtype; | |
1034 | h->slen = hlen; | |
1035 | *hptr = h; | |
1036 | hptr = &(h->next); | |
1037 | } | |
1038 | ||
1039 | /* Advance for next header line within the string */ | |
1040 | ||
1041 | p = q; | |
1042 | } | |
1043 | } | |
1044 | ||
1045 | ||
1046 | ||
1047 | ||
059ec3d9 PH |
1048 | /************************************************* |
1049 | * Handle warnings * | |
1050 | *************************************************/ | |
1051 | ||
1052 | /* This function is called when a WARN verb's conditions are true. It adds to | |
1053 | the message's headers, and/or writes information to the log. In each case, this | |
1054 | only happens once (per message for headers, per connection for log). | |
1055 | ||
71fafd95 PH |
1056 | ** NOTE: The header adding action using the "message" setting is historic, and |
1057 | its use is now deprecated. The new add_header modifier should be used instead. | |
1058 | ||
059ec3d9 PH |
1059 | Arguments: |
1060 | where ACL_WHERE_xxxx indicating which ACL this is | |
1061 | user_message message for adding to headers | |
1062 | log_message message for logging, if different | |
1063 | ||
1064 | Returns: nothing | |
1065 | */ | |
1066 | ||
1067 | static void | |
1068 | acl_warn(int where, uschar *user_message, uschar *log_message) | |
1069 | { | |
059ec3d9 PH |
1070 | if (log_message != NULL && log_message != user_message) |
1071 | { | |
1072 | uschar *text; | |
1073 | string_item *logged; | |
1074 | ||
1075 | text = string_sprintf("%s Warning: %s", host_and_ident(TRUE), | |
1076 | string_printing(log_message)); | |
1077 | ||
1078 | /* If a sender verification has failed, and the log message is "sender verify | |
1079 | failed", add the failure message. */ | |
1080 | ||
1081 | if (sender_verified_failed != NULL && | |
1082 | sender_verified_failed->message != NULL && | |
1083 | strcmpic(log_message, US"sender verify failed") == 0) | |
1084 | text = string_sprintf("%s: %s", text, sender_verified_failed->message); | |
1085 | ||
9c7a242c PH |
1086 | /* Search previously logged warnings. They are kept in malloc |
1087 | store so they can be freed at the start of a new message. */ | |
059ec3d9 PH |
1088 | |
1089 | for (logged = acl_warn_logged; logged != NULL; logged = logged->next) | |
1090 | if (Ustrcmp(logged->text, text) == 0) break; | |
1091 | ||
1092 | if (logged == NULL) | |
1093 | { | |
1094 | int length = Ustrlen(text) + 1; | |
1095 | log_write(0, LOG_MAIN, "%s", text); | |
1096 | logged = store_malloc(sizeof(string_item) + length); | |
1097 | logged->text = (uschar *)logged + sizeof(string_item); | |
1098 | memcpy(logged->text, text, length); | |
1099 | logged->next = acl_warn_logged; | |
1100 | acl_warn_logged = logged; | |
1101 | } | |
1102 | } | |
1103 | ||
1104 | /* If there's no user message, we are done. */ | |
1105 | ||
1106 | if (user_message == NULL) return; | |
1107 | ||
1108 | /* If this isn't a message ACL, we can't do anything with a user message. | |
1109 | Log an error. */ | |
1110 | ||
1111 | if (where > ACL_WHERE_NOTSMTP) | |
1112 | { | |
1113 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting " | |
1114 | "found in a non-message (%s) ACL: cannot specify header lines here: " | |
1115 | "message ignored", acl_wherenames[where]); | |
1116 | return; | |
1117 | } | |
1118 | ||
71fafd95 PH |
1119 | /* The code for setting up header lines is now abstracted into a separate |
1120 | function so that it can be used for the add_header modifier as well. */ | |
059ec3d9 | 1121 | |
71fafd95 | 1122 | setup_header(user_message); |
059ec3d9 PH |
1123 | } |
1124 | ||
1125 | ||
1126 | ||
1127 | /************************************************* | |
1128 | * Verify and check reverse DNS * | |
1129 | *************************************************/ | |
1130 | ||
1131 | /* Called from acl_verify() below. We look up the host name(s) of the client IP | |
1132 | address if this has not yet been done. The host_name_lookup() function checks | |
1133 | that one of these names resolves to an address list that contains the client IP | |
1134 | address, so we don't actually have to do the check here. | |
1135 | ||
1136 | Arguments: | |
1137 | user_msgptr pointer for user message | |
1138 | log_msgptr pointer for log message | |
1139 | ||
1140 | Returns: OK verification condition succeeded | |
1141 | FAIL verification failed | |
1142 | DEFER there was a problem verifying | |
1143 | */ | |
1144 | ||
1145 | static int | |
1146 | acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr) | |
1147 | { | |
1148 | int rc; | |
1149 | ||
1150 | user_msgptr = user_msgptr; /* stop compiler warning */ | |
1151 | ||
1152 | /* Previous success */ | |
1153 | ||
1154 | if (sender_host_name != NULL) return OK; | |
1155 | ||
1156 | /* Previous failure */ | |
1157 | ||
1158 | if (host_lookup_failed) | |
1159 | { | |
1160 | *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg); | |
1161 | return FAIL; | |
1162 | } | |
1163 | ||
1164 | /* Need to do a lookup */ | |
1165 | ||
1166 | HDEBUG(D_acl) | |
1167 | debug_printf("looking up host name to force name/address consistency check\n"); | |
1168 | ||
1169 | if ((rc = host_name_lookup()) != OK) | |
1170 | { | |
1171 | *log_msgptr = (rc == DEFER)? | |
1172 | US"host lookup deferred for reverse lookup check" | |
1173 | : | |
1174 | string_sprintf("host lookup failed for reverse lookup check%s", | |
1175 | host_lookup_msg); | |
1176 | return rc; /* DEFER or FAIL */ | |
1177 | } | |
1178 | ||
1179 | host_build_sender_fullhost(); | |
1180 | return OK; | |
1181 | } | |
1182 | ||
1183 | ||
1184 | ||
e5a9dba6 PH |
1185 | /************************************************* |
1186 | * Check client IP address matches CSA target * | |
1187 | *************************************************/ | |
1188 | ||
1189 | /* Called from acl_verify_csa() below. This routine scans a section of a DNS | |
1190 | response for address records belonging to the CSA target hostname. The section | |
1191 | is specified by the reset argument, either RESET_ADDITIONAL or RESET_ANSWERS. | |
1192 | If one of the addresses matches the client's IP address, then the client is | |
1193 | authorized by CSA. If there are target IP addresses but none of them match | |
1194 | then the client is using an unauthorized IP address. If there are no target IP | |
1195 | addresses then the client cannot be using an authorized IP address. (This is | |
1196 | an odd configuration - why didn't the SRV record have a weight of 1 instead?) | |
1197 | ||
1198 | Arguments: | |
1199 | dnsa the DNS answer block | |
1200 | dnss a DNS scan block for us to use | |
1201 | reset option specifing what portion to scan, as described above | |
1202 | target the target hostname to use for matching RR names | |
1203 | ||
1204 | Returns: CSA_OK successfully authorized | |
1205 | CSA_FAIL_MISMATCH addresses found but none matched | |
1206 | CSA_FAIL_NOADDR no target addresses found | |
1207 | */ | |
1208 | ||
1209 | static int | |
1210 | acl_verify_csa_address(dns_answer *dnsa, dns_scan *dnss, int reset, | |
1211 | uschar *target) | |
1212 | { | |
1213 | dns_record *rr; | |
1214 | dns_address *da; | |
1215 | ||
1216 | BOOL target_found = FALSE; | |
1217 | ||
1218 | for (rr = dns_next_rr(dnsa, dnss, reset); | |
1219 | rr != NULL; | |
1220 | rr = dns_next_rr(dnsa, dnss, RESET_NEXT)) | |
1221 | { | |
1222 | /* Check this is an address RR for the target hostname. */ | |
1223 | ||
1224 | if (rr->type != T_A | |
1225 | #if HAVE_IPV6 | |
1226 | && rr->type != T_AAAA | |
1227 | #ifdef SUPPORT_A6 | |
1228 | && rr->type != T_A6 | |
1229 | #endif | |
1230 | #endif | |
1231 | ) continue; | |
1232 | ||
1233 | if (strcmpic(target, rr->name) != 0) continue; | |
1234 | ||
1235 | target_found = TRUE; | |
1236 | ||
1237 | /* Turn the target address RR into a list of textual IP addresses and scan | |
1238 | the list. There may be more than one if it is an A6 RR. */ | |
1239 | ||
1240 | for (da = dns_address_from_rr(dnsa, rr); da != NULL; da = da->next) | |
1241 | { | |
1242 | /* If the client IP address matches the target IP address, it's good! */ | |
1243 | ||
1244 | DEBUG(D_acl) debug_printf("CSA target address is %s\n", da->address); | |
1245 | ||
1246 | if (strcmpic(sender_host_address, da->address) == 0) return CSA_OK; | |
1247 | } | |
1248 | } | |
1249 | ||
1250 | /* If we found some target addresses but none of them matched, the client is | |
1251 | using an unauthorized IP address, otherwise the target has no authorized IP | |
1252 | addresses. */ | |
1253 | ||
1254 | if (target_found) return CSA_FAIL_MISMATCH; | |
1255 | else return CSA_FAIL_NOADDR; | |
1256 | } | |
1257 | ||
1258 | ||
1259 | ||
1260 | /************************************************* | |
1261 | * Verify Client SMTP Authorization * | |
1262 | *************************************************/ | |
1263 | ||
1264 | /* Called from acl_verify() below. This routine calls dns_lookup_special() | |
1265 | to find the CSA SRV record corresponding to the domain argument, or | |
1266 | $sender_helo_name if no argument is provided. It then checks that the | |
1267 | client is authorized, and that its IP address corresponds to the SRV | |
1268 | target's address by calling acl_verify_csa_address() above. The address | |
1269 | should have been returned in the DNS response's ADDITIONAL section, but if | |
1270 | not we perform another DNS lookup to get it. | |
1271 | ||
1272 | Arguments: | |
1273 | domain pointer to optional parameter following verify = csa | |
1274 | ||
1275 | Returns: CSA_UNKNOWN no valid CSA record found | |
1276 | CSA_OK successfully authorized | |
1277 | CSA_FAIL_* client is definitely not authorized | |
1278 | CSA_DEFER_* there was a DNS problem | |
1279 | */ | |
1280 | ||
1281 | static int | |
1282 | acl_verify_csa(uschar *domain) | |
1283 | { | |
1284 | tree_node *t; | |
1285 | uschar *found, *p; | |
1286 | int priority, weight, port; | |
1287 | dns_answer dnsa; | |
1288 | dns_scan dnss; | |
1289 | dns_record *rr; | |
1290 | int rc, type; | |
1291 | uschar target[256]; | |
1292 | ||
1293 | /* Work out the domain we are using for the CSA lookup. The default is the | |
1294 | client's HELO domain. If the client has not said HELO, use its IP address | |
1295 | instead. If it's a local client (exim -bs), CSA isn't applicable. */ | |
1296 | ||
1297 | while (isspace(*domain) && *domain != '\0') ++domain; | |
1298 | if (*domain == '\0') domain = sender_helo_name; | |
1299 | if (domain == NULL) domain = sender_host_address; | |
1300 | if (sender_host_address == NULL) return CSA_UNKNOWN; | |
1301 | ||
1302 | /* If we have an address literal, strip off the framing ready for turning it | |
1303 | into a domain. The framing consists of matched square brackets possibly | |
1304 | containing a keyword and a colon before the actual IP address. */ | |
1305 | ||
1306 | if (domain[0] == '[') | |
1307 | { | |
1308 | uschar *start = Ustrchr(domain, ':'); | |
1309 | if (start == NULL) start = domain; | |
1310 | domain = string_copyn(start + 1, Ustrlen(start) - 2); | |
1311 | } | |
1312 | ||
1313 | /* Turn domains that look like bare IP addresses into domains in the reverse | |
1314 | DNS. This code also deals with address literals and $sender_host_address. It's | |
1315 | not quite kosher to treat bare domains such as EHLO 192.0.2.57 the same as | |
1316 | address literals, but it's probably the most friendly thing to do. This is an | |
1317 | extension to CSA, so we allow it to be turned off for proper conformance. */ | |
1318 | ||
7e66e54d | 1319 | if (string_is_ip_address(domain, NULL) != 0) |
e5a9dba6 PH |
1320 | { |
1321 | if (!dns_csa_use_reverse) return CSA_UNKNOWN; | |
1322 | dns_build_reverse(domain, target); | |
1323 | domain = target; | |
1324 | } | |
1325 | ||
1326 | /* Find out if we've already done the CSA check for this domain. If we have, | |
1327 | return the same result again. Otherwise build a new cached result structure | |
1328 | for this domain. The name is filled in now, and the value is filled in when | |
1329 | we return from this function. */ | |
1330 | ||
1331 | t = tree_search(csa_cache, domain); | |
1332 | if (t != NULL) return t->data.val; | |
1333 | ||
1334 | t = store_get_perm(sizeof(tree_node) + Ustrlen(domain)); | |
1335 | Ustrcpy(t->name, domain); | |
1336 | (void)tree_insertnode(&csa_cache, t); | |
1337 | ||
1338 | /* Now we are ready to do the actual DNS lookup(s). */ | |
1339 | ||
28e6ef29 | 1340 | found = domain; |
e5a9dba6 PH |
1341 | switch (dns_special_lookup(&dnsa, domain, T_CSA, &found)) |
1342 | { | |
1343 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1344 | ||
1345 | default: | |
1346 | return t->data.val = CSA_DEFER_SRV; | |
1347 | ||
1348 | /* If we found nothing, the client's authorization is unknown. */ | |
1349 | ||
1350 | case DNS_NOMATCH: | |
1351 | case DNS_NODATA: | |
1352 | return t->data.val = CSA_UNKNOWN; | |
1353 | ||
1354 | /* We got something! Go on to look at the reply in more detail. */ | |
1355 | ||
1356 | case DNS_SUCCEED: | |
1357 | break; | |
1358 | } | |
1359 | ||
1360 | /* Scan the reply for well-formed CSA SRV records. */ | |
1361 | ||
1362 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
1363 | rr != NULL; | |
1364 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
1365 | { | |
1366 | if (rr->type != T_SRV) continue; | |
1367 | ||
1368 | /* Extract the numerical SRV fields (p is incremented) */ | |
1369 | ||
1370 | p = rr->data; | |
1371 | GETSHORT(priority, p); | |
1372 | GETSHORT(weight, p); | |
1373 | GETSHORT(port, p); | |
1374 | ||
1375 | DEBUG(D_acl) | |
1376 | debug_printf("CSA priority=%d weight=%d port=%d\n", priority, weight, port); | |
1377 | ||
1378 | /* Check the CSA version number */ | |
1379 | ||
1380 | if (priority != 1) continue; | |
1381 | ||
1382 | /* If the domain does not have a CSA SRV record of its own (i.e. the domain | |
1383 | found by dns_special_lookup() is a parent of the one we asked for), we check | |
1384 | the subdomain assertions in the port field. At the moment there's only one | |
1385 | assertion: legitimate SMTP clients are all explicitly authorized with CSA | |
1386 | SRV records of their own. */ | |
1387 | ||
1388 | if (found != domain) | |
1389 | { | |
1390 | if (port & 1) | |
1391 | return t->data.val = CSA_FAIL_EXPLICIT; | |
1392 | else | |
1393 | return t->data.val = CSA_UNKNOWN; | |
1394 | } | |
1395 | ||
1396 | /* This CSA SRV record refers directly to our domain, so we check the value | |
1397 | in the weight field to work out the domain's authorization. 0 and 1 are | |
1398 | unauthorized; 3 means the client is authorized but we can't check the IP | |
1399 | address in order to authenticate it, so we treat it as unknown; values | |
1400 | greater than 3 are undefined. */ | |
1401 | ||
1402 | if (weight < 2) return t->data.val = CSA_FAIL_DOMAIN; | |
1403 | ||
1404 | if (weight > 2) continue; | |
1405 | ||
1406 | /* Weight == 2, which means the domain is authorized. We must check that the | |
1407 | client's IP address is listed as one of the SRV target addresses. Save the | |
1408 | target hostname then break to scan the additional data for its addresses. */ | |
1409 | ||
1410 | (void)dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, | |
1411 | (DN_EXPAND_ARG4_TYPE)target, sizeof(target)); | |
1412 | ||
1413 | DEBUG(D_acl) debug_printf("CSA target is %s\n", target); | |
1414 | ||
1415 | break; | |
1416 | } | |
1417 | ||
1418 | /* If we didn't break the loop then no appropriate records were found. */ | |
1419 | ||
1420 | if (rr == NULL) return t->data.val = CSA_UNKNOWN; | |
1421 | ||
1422 | /* Do not check addresses if the target is ".", in accordance with RFC 2782. | |
1423 | A target of "." indicates there are no valid addresses, so the client cannot | |
1424 | be authorized. (This is an odd configuration because weight=2 target=. is | |
1425 | equivalent to weight=1, but we check for it in order to keep load off the | |
1426 | root name servers.) Note that dn_expand() turns "." into "". */ | |
1427 | ||
1428 | if (Ustrcmp(target, "") == 0) return t->data.val = CSA_FAIL_NOADDR; | |
1429 | ||
1430 | /* Scan the additional section of the CSA SRV reply for addresses belonging | |
1431 | to the target. If the name server didn't return any additional data (e.g. | |
1432 | because it does not fully support SRV records), we need to do another lookup | |
1433 | to obtain the target addresses; otherwise we have a definitive result. */ | |
1434 | ||
1435 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ADDITIONAL, target); | |
1436 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1437 | ||
1438 | /* The DNS lookup type corresponds to the IP version used by the client. */ | |
1439 | ||
1440 | #if HAVE_IPV6 | |
1441 | if (Ustrchr(sender_host_address, ':') != NULL) | |
1442 | type = T_AAAA; | |
1443 | else | |
1444 | #endif /* HAVE_IPV6 */ | |
1445 | type = T_A; | |
1446 | ||
1447 | ||
1448 | #if HAVE_IPV6 && defined(SUPPORT_A6) | |
1449 | DNS_LOOKUP_AGAIN: | |
1450 | #endif | |
1451 | ||
1452 | switch (dns_lookup(&dnsa, target, type, NULL)) | |
1453 | { | |
1454 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1455 | ||
1456 | default: | |
1457 | return t->data.val = CSA_DEFER_ADDR; | |
1458 | ||
1459 | /* If the query succeeded, scan the addresses and return the result. */ | |
1460 | ||
1461 | case DNS_SUCCEED: | |
1462 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ANSWERS, target); | |
1463 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1464 | /* else fall through */ | |
1465 | ||
1466 | /* If the target has no IP addresses, the client cannot have an authorized | |
1467 | IP address. However, if the target site uses A6 records (not AAAA records) | |
1468 | we have to do yet another lookup in order to check them. */ | |
1469 | ||
1470 | case DNS_NOMATCH: | |
1471 | case DNS_NODATA: | |
1472 | ||
1473 | #if HAVE_IPV6 && defined(SUPPORT_A6) | |
1474 | if (type == T_AAAA) { type = T_A6; goto DNS_LOOKUP_AGAIN; } | |
1475 | #endif | |
1476 | ||
1477 | return t->data.val = CSA_FAIL_NOADDR; | |
1478 | } | |
1479 | } | |
1480 | ||
1481 | ||
1482 | ||
059ec3d9 PH |
1483 | /************************************************* |
1484 | * Handle verification (address & other) * | |
1485 | *************************************************/ | |
1486 | ||
1487 | /* This function implements the "verify" condition. It is called when | |
1488 | encountered in any ACL, because some tests are almost always permitted. Some | |
1489 | just don't make sense, and always fail (for example, an attempt to test a host | |
1490 | lookup for a non-TCP/IP message). Others are restricted to certain ACLs. | |
1491 | ||
1492 | Arguments: | |
1493 | where where called from | |
1494 | addr the recipient address that the ACL is handling, or NULL | |
1495 | arg the argument of "verify" | |
1496 | user_msgptr pointer for user message | |
1497 | log_msgptr pointer for log message | |
1498 | basic_errno where to put verify errno | |
1499 | ||
1500 | Returns: OK verification condition succeeded | |
1501 | FAIL verification failed | |
1502 | DEFER there was a problem verifying | |
1503 | ERROR syntax error | |
1504 | */ | |
1505 | ||
1506 | static int | |
1507 | acl_verify(int where, address_item *addr, uschar *arg, | |
1508 | uschar **user_msgptr, uschar **log_msgptr, int *basic_errno) | |
1509 | { | |
1510 | int sep = '/'; | |
1511 | int callout = -1; | |
1512 | int callout_overall = -1; | |
4deaf07d | 1513 | int callout_connect = -1; |
059ec3d9 PH |
1514 | int verify_options = 0; |
1515 | int rc; | |
1516 | BOOL verify_header_sender = FALSE; | |
1517 | BOOL defer_ok = FALSE; | |
1518 | BOOL callout_defer_ok = FALSE; | |
1519 | BOOL no_details = FALSE; | |
eafd343b | 1520 | BOOL success_on_redirect = FALSE; |
059ec3d9 PH |
1521 | address_item *sender_vaddr = NULL; |
1522 | uschar *verify_sender_address = NULL; | |
1523 | uschar *pm_mailfrom = NULL; | |
1524 | uschar *se_mailfrom = NULL; | |
596875b3 PH |
1525 | |
1526 | /* Some of the verify items have slash-separated options; some do not. Diagnose | |
1527 | an error if options are given for items that don't expect them. This code has | |
1528 | now got very message. Refactoring to use a table would be a good idea one day. | |
1529 | */ | |
1530 | ||
1531 | uschar *slash = Ustrchr(arg, '/'); | |
059ec3d9 PH |
1532 | uschar *list = arg; |
1533 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
1534 | ||
1535 | if (ss == NULL) goto BAD_VERIFY; | |
1536 | ||
1537 | /* Handle name/address consistency verification in a separate function. */ | |
1538 | ||
1539 | if (strcmpic(ss, US"reverse_host_lookup") == 0) | |
1540 | { | |
596875b3 | 1541 | if (slash != NULL) goto NO_OPTIONS; |
059ec3d9 PH |
1542 | if (sender_host_address == NULL) return OK; |
1543 | return acl_verify_reverse(user_msgptr, log_msgptr); | |
1544 | } | |
1545 | ||
1546 | /* TLS certificate verification is done at STARTTLS time; here we just | |
1547 | test whether it was successful or not. (This is for optional verification; for | |
1548 | mandatory verification, the connection doesn't last this long.) */ | |
1549 | ||
1550 | if (strcmpic(ss, US"certificate") == 0) | |
1551 | { | |
596875b3 | 1552 | if (slash != NULL) goto NO_OPTIONS; |
059ec3d9 PH |
1553 | if (tls_certificate_verified) return OK; |
1554 | *user_msgptr = US"no verified certificate"; | |
1555 | return FAIL; | |
1556 | } | |
1557 | ||
d7b47fd0 PH |
1558 | /* We can test the result of optional HELO verification that might have |
1559 | occurred earlier. If not, we can attempt the verification now. */ | |
059ec3d9 | 1560 | |
596875b3 PH |
1561 | if (strcmpic(ss, US"helo") == 0) |
1562 | { | |
1563 | if (slash != NULL) goto NO_OPTIONS; | |
0154e85a TF |
1564 | if (!helo_verified && !helo_verify_failed) smtp_verify_helo(); |
1565 | return helo_verified? OK : FAIL; | |
596875b3 | 1566 | } |
059ec3d9 | 1567 | |
e5a9dba6 PH |
1568 | /* Do Client SMTP Authorization checks in a separate function, and turn the |
1569 | result code into user-friendly strings. */ | |
1570 | ||
1571 | if (strcmpic(ss, US"csa") == 0) | |
1572 | { | |
1573 | rc = acl_verify_csa(list); | |
1574 | *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s", | |
1575 | csa_reason_string[rc]); | |
1576 | csa_status = csa_status_string[rc]; | |
1577 | DEBUG(D_acl) debug_printf("CSA result %s\n", csa_status); | |
1578 | return csa_return_code[rc]; | |
1579 | } | |
1580 | ||
596875b3 PH |
1581 | /* Check that all relevant header lines have the correct syntax. If there is |
1582 | a syntax error, we return details of the error to the sender if configured to | |
1583 | send out full details. (But a "message" setting on the ACL can override, as | |
1584 | always). */ | |
059ec3d9 | 1585 | |
596875b3 | 1586 | if (strcmpic(ss, US"header_syntax") == 0) |
059ec3d9 | 1587 | { |
596875b3 | 1588 | if (slash != NULL) goto NO_OPTIONS; |
1c41c9cc | 1589 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; |
596875b3 PH |
1590 | rc = verify_check_headers(log_msgptr); |
1591 | if (rc != OK && smtp_return_error_details && *log_msgptr != NULL) | |
1592 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1593 | return rc; | |
1594 | } | |
059ec3d9 | 1595 | |
1c41c9cc PH |
1596 | /* Check that no recipient of this message is "blind", that is, every envelope |
1597 | recipient must be mentioned in either To: or Cc:. */ | |
1598 | ||
1599 | if (strcmpic(ss, US"not_blind") == 0) | |
1600 | { | |
1601 | if (slash != NULL) goto NO_OPTIONS; | |
1602 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; | |
1603 | rc = verify_check_notblind(); | |
1604 | if (rc != OK) | |
1605 | { | |
1606 | *log_msgptr = string_sprintf("bcc recipient detected"); | |
1607 | if (smtp_return_error_details) | |
1608 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1609 | } | |
1610 | return rc; | |
1611 | } | |
059ec3d9 | 1612 | |
596875b3 PH |
1613 | /* The remaining verification tests check recipient and sender addresses, |
1614 | either from the envelope or from the header. There are a number of | |
1615 | slash-separated options that are common to all of them. */ | |
059ec3d9 | 1616 | |
059ec3d9 | 1617 | |
596875b3 PH |
1618 | /* Check that there is at least one verifiable sender address in the relevant |
1619 | header lines. This can be followed by callout and defer options, just like | |
1620 | sender and recipient. */ | |
059ec3d9 | 1621 | |
596875b3 PH |
1622 | if (strcmpic(ss, US"header_sender") == 0) |
1623 | { | |
1c41c9cc | 1624 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; |
596875b3 | 1625 | verify_header_sender = TRUE; |
059ec3d9 PH |
1626 | } |
1627 | ||
1628 | /* Otherwise, first item in verify argument must be "sender" or "recipient". | |
1629 | In the case of a sender, this can optionally be followed by an address to use | |
1630 | in place of the actual sender (rare special-case requirement). */ | |
1631 | ||
1632 | else if (strncmpic(ss, US"sender", 6) == 0) | |
1633 | { | |
1634 | uschar *s = ss + 6; | |
1635 | if (where > ACL_WHERE_NOTSMTP) | |
1636 | { | |
1637 | *log_msgptr = string_sprintf("cannot verify sender in ACL for %s " | |
1638 | "(only possible for MAIL, RCPT, PREDATA, or DATA)", | |
1639 | acl_wherenames[where]); | |
1640 | return ERROR; | |
1641 | } | |
1642 | if (*s == 0) | |
1643 | verify_sender_address = sender_address; | |
1644 | else | |
1645 | { | |
1646 | while (isspace(*s)) s++; | |
1647 | if (*s++ != '=') goto BAD_VERIFY; | |
1648 | while (isspace(*s)) s++; | |
1649 | verify_sender_address = string_copy(s); | |
1650 | } | |
1651 | } | |
1652 | else | |
1653 | { | |
1654 | if (strcmpic(ss, US"recipient") != 0) goto BAD_VERIFY; | |
1655 | if (addr == NULL) | |
1656 | { | |
1657 | *log_msgptr = string_sprintf("cannot verify recipient in ACL for %s " | |
1658 | "(only possible for RCPT)", acl_wherenames[where]); | |
1659 | return ERROR; | |
1660 | } | |
1661 | } | |
1662 | ||
596875b3 PH |
1663 | /* Remaining items are optional; they apply to sender and recipient |
1664 | verification, including "header sender" verification. */ | |
059ec3d9 PH |
1665 | |
1666 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) | |
1667 | != NULL) | |
1668 | { | |
1669 | if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE; | |
1670 | else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE; | |
eafd343b | 1671 | else if (strcmpic(ss, US"success_on_redirect") == 0) success_on_redirect = TRUE; |
059ec3d9 PH |
1672 | |
1673 | /* These two old options are left for backwards compatibility */ | |
1674 | ||
1675 | else if (strcmpic(ss, US"callout_defer_ok") == 0) | |
1676 | { | |
1677 | callout_defer_ok = TRUE; | |
1678 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1679 | } | |
1680 | ||
1681 | else if (strcmpic(ss, US"check_postmaster") == 0) | |
1682 | { | |
1683 | pm_mailfrom = US""; | |
1684 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1685 | } | |
1686 | ||
1687 | /* The callout option has a number of sub-options, comma separated */ | |
1688 | ||
1689 | else if (strncmpic(ss, US"callout", 7) == 0) | |
1690 | { | |
1691 | callout = CALLOUT_TIMEOUT_DEFAULT; | |
1692 | ss += 7; | |
1693 | if (*ss != 0) | |
1694 | { | |
1695 | while (isspace(*ss)) ss++; | |
1696 | if (*ss++ == '=') | |
1697 | { | |
1698 | int optsep = ','; | |
1699 | uschar *opt; | |
1700 | uschar buffer[256]; | |
1701 | while (isspace(*ss)) ss++; | |
8e669ac1 PH |
1702 | |
1703 | /* This callout option handling code has become a mess as new options | |
1704 | have been added in an ad hoc manner. It should be tidied up into some | |
4deaf07d | 1705 | kind of table-driven thing. */ |
8e669ac1 | 1706 | |
059ec3d9 PH |
1707 | while ((opt = string_nextinlist(&ss, &optsep, buffer, sizeof(buffer))) |
1708 | != NULL) | |
1709 | { | |
1710 | if (strcmpic(opt, US"defer_ok") == 0) callout_defer_ok = TRUE; | |
1711 | else if (strcmpic(opt, US"no_cache") == 0) | |
1712 | verify_options |= vopt_callout_no_cache; | |
1713 | else if (strcmpic(opt, US"random") == 0) | |
1714 | verify_options |= vopt_callout_random; | |
1715 | else if (strcmpic(opt, US"use_sender") == 0) | |
1716 | verify_options |= vopt_callout_recipsender; | |
1717 | else if (strcmpic(opt, US"use_postmaster") == 0) | |
1718 | verify_options |= vopt_callout_recippmaster; | |
1719 | else if (strcmpic(opt, US"postmaster") == 0) pm_mailfrom = US""; | |
2a4be8f9 PH |
1720 | else if (strcmpic(opt, US"fullpostmaster") == 0) |
1721 | { | |
1722 | pm_mailfrom = US""; | |
1723 | verify_options |= vopt_callout_fullpm; | |
1724 | } | |
059ec3d9 PH |
1725 | |
1726 | else if (strncmpic(opt, US"mailfrom", 8) == 0) | |
1727 | { | |
1728 | if (!verify_header_sender) | |
1729 | { | |
1730 | *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a " | |
1731 | "callout option only for verify=header_sender (detected in ACL " | |
1732 | "condition \"%s\")", arg); | |
1733 | return ERROR; | |
1734 | } | |
1735 | opt += 8; | |
1736 | while (isspace(*opt)) opt++; | |
1737 | if (*opt++ != '=') | |
1738 | { | |
1739 | *log_msgptr = string_sprintf("'=' expected after " | |
1740 | "\"mailfrom\" in ACL condition \"%s\"", arg); | |
1741 | return ERROR; | |
1742 | } | |
1743 | while (isspace(*opt)) opt++; | |
1744 | se_mailfrom = string_copy(opt); | |
1745 | } | |
1746 | ||
1747 | else if (strncmpic(opt, US"postmaster_mailfrom", 19) == 0) | |
1748 | { | |
1749 | opt += 19; | |
1750 | while (isspace(*opt)) opt++; | |
1751 | if (*opt++ != '=') | |
1752 | { | |
1753 | *log_msgptr = string_sprintf("'=' expected after " | |
1754 | "\"postmaster_mailfrom\" in ACL condition \"%s\"", arg); | |
1755 | return ERROR; | |
1756 | } | |
1757 | while (isspace(*opt)) opt++; | |
1758 | pm_mailfrom = string_copy(opt); | |
1759 | } | |
1760 | ||
1761 | else if (strncmpic(opt, US"maxwait", 7) == 0) | |
1762 | { | |
1763 | opt += 7; | |
1764 | while (isspace(*opt)) opt++; | |
1765 | if (*opt++ != '=') | |
1766 | { | |
1767 | *log_msgptr = string_sprintf("'=' expected after \"maxwait\" in " | |
1768 | "ACL condition \"%s\"", arg); | |
1769 | return ERROR; | |
1770 | } | |
1771 | while (isspace(*opt)) opt++; | |
1772 | callout_overall = readconf_readtime(opt, 0, FALSE); | |
1773 | if (callout_overall < 0) | |
1774 | { | |
1775 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1776 | "\"verify %s\"", arg); | |
1777 | return ERROR; | |
1778 | } | |
1779 | } | |
4deaf07d PH |
1780 | else if (strncmpic(opt, US"connect", 7) == 0) |
1781 | { | |
1782 | opt += 7; | |
1783 | while (isspace(*opt)) opt++; | |
1784 | if (*opt++ != '=') | |
1785 | { | |
1786 | *log_msgptr = string_sprintf("'=' expected after " | |
1787 | "\"callout_overaall\" in ACL condition \"%s\"", arg); | |
1788 | return ERROR; | |
1789 | } | |
1790 | while (isspace(*opt)) opt++; | |
1791 | callout_connect = readconf_readtime(opt, 0, FALSE); | |
1792 | if (callout_connect < 0) | |
1793 | { | |
1794 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1795 | "\"verify %s\"", arg); | |
1796 | return ERROR; | |
1797 | } | |
1798 | } | |
059ec3d9 PH |
1799 | else /* Plain time is callout connect/command timeout */ |
1800 | { | |
1801 | callout = readconf_readtime(opt, 0, FALSE); | |
1802 | if (callout < 0) | |
1803 | { | |
1804 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1805 | "\"verify %s\"", arg); | |
1806 | return ERROR; | |
1807 | } | |
1808 | } | |
1809 | } | |
1810 | } | |
1811 | else | |
1812 | { | |
1813 | *log_msgptr = string_sprintf("'=' expected after \"callout\" in " | |
1814 | "ACL condition \"%s\"", arg); | |
1815 | return ERROR; | |
1816 | } | |
1817 | } | |
1818 | } | |
1819 | ||
1820 | /* Option not recognized */ | |
1821 | ||
1822 | else | |
1823 | { | |
1824 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " | |
1825 | "condition \"verify %s\"", ss, arg); | |
1826 | return ERROR; | |
1827 | } | |
1828 | } | |
1829 | ||
1830 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == | |
1831 | (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1832 | { | |
1833 | *log_msgptr = US"only one of use_sender and use_postmaster can be set " | |
1834 | "for a recipient callout"; | |
1835 | return ERROR; | |
1836 | } | |
1837 | ||
1838 | /* Handle sender-in-header verification. Default the user message to the log | |
1839 | message if giving out verification details. */ | |
1840 | ||
1841 | if (verify_header_sender) | |
1842 | { | |
8e669ac1 | 1843 | int verrno; |
059ec3d9 | 1844 | rc = verify_check_header_address(user_msgptr, log_msgptr, callout, |
fe5b5d0b PH |
1845 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, verify_options, |
1846 | &verrno); | |
1847 | if (rc != OK) | |
8e669ac1 | 1848 | { |
fe5b5d0b PH |
1849 | *basic_errno = verrno; |
1850 | if (smtp_return_error_details) | |
1851 | { | |
1852 | if (*user_msgptr == NULL && *log_msgptr != NULL) | |
1853 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1854 | if (rc == DEFER) acl_temp_details = TRUE; | |
1855 | } | |
8e669ac1 | 1856 | } |
059ec3d9 PH |
1857 | } |
1858 | ||
1859 | /* Handle a sender address. The default is to verify *the* sender address, but | |
1860 | optionally a different address can be given, for special requirements. If the | |
1861 | address is empty, we are dealing with a bounce message that has no sender, so | |
1862 | we cannot do any checking. If the real sender address gets rewritten during | |
1863 | verification (e.g. DNS widening), set the flag to stop it being rewritten again | |
1864 | during message reception. | |
1865 | ||
1866 | A list of verified "sender" addresses is kept to try to avoid doing to much | |
1867 | work repetitively when there are multiple recipients in a message and they all | |
1868 | require sender verification. However, when callouts are involved, it gets too | |
1869 | complicated because different recipients may require different callout options. | |
1870 | Therefore, we always do a full sender verify when any kind of callout is | |
1871 | specified. Caching elsewhere, for instance in the DNS resolver and in the | |
1872 | callout handling, should ensure that this is not terribly inefficient. */ | |
1873 | ||
1874 | else if (verify_sender_address != NULL) | |
1875 | { | |
1876 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1877 | != 0) | |
1878 | { | |
1879 | *log_msgptr = US"use_sender or use_postmaster cannot be used for a " | |
1880 | "sender verify callout"; | |
1881 | return ERROR; | |
1882 | } | |
1883 | ||
1884 | sender_vaddr = verify_checked_sender(verify_sender_address); | |
1885 | if (sender_vaddr != NULL && /* Previously checked */ | |
1886 | callout <= 0) /* No callout needed this time */ | |
1887 | { | |
1888 | /* If the "routed" flag is set, it means that routing worked before, so | |
1889 | this check can give OK (the saved return code value, if set, belongs to a | |
1890 | callout that was done previously). If the "routed" flag is not set, routing | |
1891 | must have failed, so we use the saved return code. */ | |
1892 | ||
1893 | if (testflag(sender_vaddr, af_verify_routed)) rc = OK; else | |
1894 | { | |
1895 | rc = sender_vaddr->special_action; | |
1896 | *basic_errno = sender_vaddr->basic_errno; | |
1897 | } | |
1898 | HDEBUG(D_acl) debug_printf("using cached sender verify result\n"); | |
1899 | } | |
1900 | ||
1901 | /* Do a new verification, and cache the result. The cache is used to avoid | |
1902 | verifying the sender multiple times for multiple RCPTs when callouts are not | |
1903 | specified (see comments above). | |
1904 | ||
1905 | The cache is also used on failure to give details in response to the first | |
1906 | RCPT that gets bounced for this reason. However, this can be suppressed by | |
1907 | the no_details option, which sets the flag that says "this detail has already | |
1908 | been sent". The cache normally contains just one address, but there may be | |
1909 | more in esoteric circumstances. */ | |
1910 | ||
1911 | else | |
1912 | { | |
1913 | BOOL routed = TRUE; | |
2a3eea10 | 1914 | uschar *save_address_data = deliver_address_data; |
8e669ac1 | 1915 | |
059ec3d9 PH |
1916 | sender_vaddr = deliver_make_addr(verify_sender_address, TRUE); |
1917 | if (no_details) setflag(sender_vaddr, af_sverify_told); | |
1918 | if (verify_sender_address[0] != 0) | |
1919 | { | |
1920 | /* If this is the real sender address, save the unrewritten version | |
1921 | for use later in receive. Otherwise, set a flag so that rewriting the | |
1922 | sender in verify_address() does not update sender_address. */ | |
1923 | ||
1924 | if (verify_sender_address == sender_address) | |
1925 | sender_address_unrewritten = sender_address; | |
1926 | else | |
1927 | verify_options |= vopt_fake_sender; | |
1928 | ||
eafd343b TK |
1929 | if (success_on_redirect) |
1930 | verify_options |= vopt_success_on_redirect; | |
1931 | ||
059ec3d9 PH |
1932 | /* The recipient, qualify, and expn options are never set in |
1933 | verify_options. */ | |
1934 | ||
1935 | rc = verify_address(sender_vaddr, NULL, verify_options, callout, | |
4deaf07d | 1936 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, &routed); |
059ec3d9 PH |
1937 | |
1938 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); | |
1939 | ||
1940 | if (rc == OK) | |
1941 | { | |
1942 | if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0) | |
1943 | { | |
1944 | DEBUG(D_acl) debug_printf("sender %s verified ok as %s\n", | |
1945 | verify_sender_address, sender_vaddr->address); | |
1946 | } | |
1947 | else | |
1948 | { | |
1949 | DEBUG(D_acl) debug_printf("sender %s verified ok\n", | |
1950 | verify_sender_address); | |
1951 | } | |
1952 | } | |
1953 | else *basic_errno = sender_vaddr->basic_errno; | |
1954 | } | |
1955 | else rc = OK; /* Null sender */ | |
1956 | ||
1957 | /* Cache the result code */ | |
1958 | ||
1959 | if (routed) setflag(sender_vaddr, af_verify_routed); | |
1960 | if (callout > 0) setflag(sender_vaddr, af_verify_callout); | |
1961 | sender_vaddr->special_action = rc; | |
1962 | sender_vaddr->next = sender_verified_list; | |
1963 | sender_verified_list = sender_vaddr; | |
8e669ac1 PH |
1964 | |
1965 | /* Restore the recipient address data, which might have been clobbered by | |
2a3eea10 | 1966 | the sender verification. */ |
8e669ac1 | 1967 | |
2a3eea10 | 1968 | deliver_address_data = save_address_data; |
059ec3d9 | 1969 | } |
8e669ac1 | 1970 | |
2a3eea10 PH |
1971 | /* Put the sender address_data value into $sender_address_data */ |
1972 | ||
8e669ac1 | 1973 | sender_address_data = sender_vaddr->p.address_data; |
059ec3d9 PH |
1974 | } |
1975 | ||
1976 | /* A recipient address just gets a straightforward verify; again we must handle | |
1977 | the DEFER overrides. */ | |
1978 | ||
1979 | else | |
1980 | { | |
1981 | address_item addr2; | |
1982 | ||
eafd343b TK |
1983 | if (success_on_redirect) |
1984 | verify_options |= vopt_success_on_redirect; | |
1985 | ||
059ec3d9 PH |
1986 | /* We must use a copy of the address for verification, because it might |
1987 | get rewritten. */ | |
1988 | ||
1989 | addr2 = *addr; | |
1990 | rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout, | |
4deaf07d | 1991 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, NULL); |
059ec3d9 | 1992 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); |
8e669ac1 | 1993 | |
42855d71 | 1994 | *basic_errno = addr2.basic_errno; |
059ec3d9 | 1995 | *log_msgptr = addr2.message; |
8e669ac1 | 1996 | *user_msgptr = (addr2.user_message != NULL)? |
6729cf78 | 1997 | addr2.user_message : addr2.message; |
42855d71 PH |
1998 | |
1999 | /* Allow details for temporary error if the address is so flagged. */ | |
2000 | if (testflag((&addr2), af_pass_message)) acl_temp_details = TRUE; | |
059ec3d9 PH |
2001 | |
2002 | /* Make $address_data visible */ | |
2003 | deliver_address_data = addr2.p.address_data; | |
2004 | } | |
2005 | ||
2006 | /* We have a result from the relevant test. Handle defer overrides first. */ | |
2007 | ||
2008 | if (rc == DEFER && (defer_ok || | |
2009 | (callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER))) | |
2010 | { | |
2011 | HDEBUG(D_acl) debug_printf("verify defer overridden by %s\n", | |
2012 | defer_ok? "defer_ok" : "callout_defer_ok"); | |
2013 | rc = OK; | |
2014 | } | |
2015 | ||
2016 | /* If we've failed a sender, set up a recipient message, and point | |
2017 | sender_verified_failed to the address item that actually failed. */ | |
2018 | ||
2019 | if (rc != OK && verify_sender_address != NULL) | |
2020 | { | |
2021 | if (rc != DEFER) | |
2022 | { | |
2023 | *log_msgptr = *user_msgptr = US"Sender verify failed"; | |
2024 | } | |
2025 | else if (*basic_errno != ERRNO_CALLOUTDEFER) | |
2026 | { | |
2027 | *log_msgptr = *user_msgptr = US"Could not complete sender verify"; | |
2028 | } | |
2029 | else | |
2030 | { | |
2031 | *log_msgptr = US"Could not complete sender verify callout"; | |
2032 | *user_msgptr = smtp_return_error_details? sender_vaddr->user_message : | |
2033 | *log_msgptr; | |
2034 | } | |
2035 | ||
2036 | sender_verified_failed = sender_vaddr; | |
2037 | } | |
2038 | ||
2039 | /* Verifying an address messes up the values of $domain and $local_part, | |
2040 | so reset them before returning if this is a RCPT ACL. */ | |
2041 | ||
2042 | if (addr != NULL) | |
2043 | { | |
2044 | deliver_domain = addr->domain; | |
2045 | deliver_localpart = addr->local_part; | |
2046 | } | |
2047 | return rc; | |
2048 | ||
2049 | /* Syntax errors in the verify argument come here. */ | |
2050 | ||
2051 | BAD_VERIFY: | |
2052 | *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", " | |
596875b3 PH |
2053 | "\"helo\", \"header_syntax\", \"header_sender\" or " |
2054 | "\"reverse_host_lookup\" at start of ACL condition " | |
059ec3d9 PH |
2055 | "\"verify %s\"", arg); |
2056 | return ERROR; | |
596875b3 PH |
2057 | |
2058 | /* Options supplied when not allowed come here */ | |
2059 | ||
2060 | NO_OPTIONS: | |
2061 | *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" " | |
2062 | "(this verify item has no options)", arg); | |
2063 | return ERROR; | |
1c41c9cc PH |
2064 | |
2065 | /* Calls in the wrong ACL come here */ | |
2066 | ||
2067 | WRONG_ACL: | |
2068 | *log_msgptr = string_sprintf("cannot check header contents in ACL for %s " | |
2069 | "(only possible in ACL for DATA)", acl_wherenames[where]); | |
2070 | return ERROR; | |
059ec3d9 PH |
2071 | } |
2072 | ||
2073 | ||
2074 | ||
2075 | ||
2076 | /************************************************* | |
2077 | * Check argument for control= modifier * | |
2078 | *************************************************/ | |
2079 | ||
2080 | /* Called from acl_check_condition() below | |
2081 | ||
2082 | Arguments: | |
2083 | arg the argument string for control= | |
2084 | pptr set to point to the terminating character | |
2085 | where which ACL we are in | |
2086 | log_msgptr for error messages | |
2087 | ||
2088 | Returns: CONTROL_xxx value | |
2089 | */ | |
2090 | ||
2091 | static int | |
2092 | decode_control(uschar *arg, uschar **pptr, int where, uschar **log_msgptr) | |
2093 | { | |
2094 | int len; | |
2095 | control_def *d; | |
2096 | ||
2097 | for (d = controls_list; | |
2098 | d < controls_list + sizeof(controls_list)/sizeof(control_def); | |
2099 | d++) | |
2100 | { | |
2101 | len = Ustrlen(d->name); | |
2102 | if (Ustrncmp(d->name, arg, len) == 0) break; | |
2103 | } | |
2104 | ||
2105 | if (d >= controls_list + sizeof(controls_list)/sizeof(control_def) || | |
2106 | (arg[len] != 0 && (!d->has_option || arg[len] != '/'))) | |
2107 | { | |
2108 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2109 | return CONTROL_ERROR; | |
2110 | } | |
2111 | ||
059ec3d9 PH |
2112 | *pptr = arg + len; |
2113 | return d->value; | |
2114 | } | |
2115 | ||
2116 | ||
2117 | ||
870f6ba8 TF |
2118 | /************************************************* |
2119 | * Handle rate limiting * | |
2120 | *************************************************/ | |
2121 | ||
2122 | /* Called by acl_check_condition() below to calculate the result | |
2123 | of the ACL ratelimit condition. | |
2124 | ||
2125 | Note that the return value might be slightly unexpected: if the | |
2126 | sender's rate is above the limit then the result is OK. This is | |
2127 | similar to the dnslists condition, and is so that you can write | |
2128 | ACL clauses like: defer ratelimit = 15 / 1h | |
2129 | ||
2130 | Arguments: | |
2131 | arg the option string for ratelimit= | |
90fc3069 | 2132 | where ACL_WHERE_xxxx indicating which ACL this is |
870f6ba8 TF |
2133 | log_msgptr for error messages |
2134 | ||
2135 | Returns: OK - Sender's rate is above limit | |
2136 | FAIL - Sender's rate is below limit | |
2137 | DEFER - Problem opening ratelimit database | |
2138 | ERROR - Syntax error in options. | |
2139 | */ | |
2140 | ||
2141 | static int | |
90fc3069 | 2142 | acl_ratelimit(uschar *arg, int where, uschar **log_msgptr) |
870f6ba8 TF |
2143 | { |
2144 | double limit, period; | |
8f240103 PH |
2145 | uschar *ss; |
2146 | uschar *key = NULL; | |
870f6ba8 | 2147 | int sep = '/'; |
8f240103 | 2148 | BOOL leaky = FALSE, strict = FALSE, noupdate = FALSE; |
870f6ba8 TF |
2149 | BOOL per_byte = FALSE, per_cmd = FALSE, per_conn = FALSE, per_mail = FALSE; |
2150 | int old_pool, rc; | |
2151 | tree_node **anchor, *t; | |
2152 | open_db dbblock, *dbm; | |
2153 | dbdata_ratelimit *dbd; | |
2154 | struct timeval tv; | |
2155 | ||
2156 | /* Parse the first two options and record their values in expansion | |
2157 | variables. These variables allow the configuration to have informative | |
2158 | error messages based on rate limits obtained from a table lookup. */ | |
2159 | ||
2160 | /* First is the maximum number of messages per period and maximum burst | |
2161 | size, which must be greater than or equal to zero. Zero is useful for | |
2162 | rate measurement as opposed to rate limiting. */ | |
2163 | ||
2164 | sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0); | |
2165 | if (sender_rate_limit == NULL) | |
2166 | limit = -1.0; | |
2167 | else | |
2168 | { | |
2169 | limit = Ustrtod(sender_rate_limit, &ss); | |
2170 | if (tolower(*ss) == 'k') { limit *= 1024.0; ss++; } | |
2171 | else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; } | |
2172 | else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; } | |
2173 | } | |
2174 | if (limit < 0.0 || *ss != 0) | |
2175 | { | |
2176 | *log_msgptr = string_sprintf("syntax error in argument for " | |
2177 | "\"ratelimit\" condition: \"%s\" is not a positive number", | |
2178 | sender_rate_limit); | |
2179 | return ERROR; | |
2180 | } | |
2181 | ||
2182 | /* Second is the rate measurement period and exponential smoothing time | |
2183 | constant. This must be strictly greater than zero, because zero leads to | |
2184 | run-time division errors. */ | |
2185 | ||
2186 | sender_rate_period = string_nextinlist(&arg, &sep, NULL, 0); | |
2187 | if (sender_rate_period == NULL) period = -1.0; | |
2188 | else period = readconf_readtime(sender_rate_period, 0, FALSE); | |
2189 | if (period <= 0.0) | |
2190 | { | |
2191 | *log_msgptr = string_sprintf("syntax error in argument for " | |
2192 | "\"ratelimit\" condition: \"%s\" is not a time value", | |
2193 | sender_rate_period); | |
2194 | return ERROR; | |
2195 | } | |
2196 | ||
2197 | /* Parse the other options. Should we check if the per_* options are being | |
2198 | used in ACLs where they don't make sense, e.g. per_mail in the connect ACL? */ | |
2199 | ||
2200 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2201 | != NULL) | |
2202 | { | |
2203 | if (strcmpic(ss, US"leaky") == 0) leaky = TRUE; | |
2204 | else if (strcmpic(ss, US"strict") == 0) strict = TRUE; | |
8f240103 | 2205 | else if (strcmpic(ss, US"noupdate") == 0) noupdate = TRUE; |
870f6ba8 | 2206 | else if (strcmpic(ss, US"per_byte") == 0) per_byte = TRUE; |
8f240103 PH |
2207 | else if (strcmpic(ss, US"per_cmd") == 0) per_cmd = TRUE; |
2208 | else if (strcmpic(ss, US"per_rcpt") == 0) per_cmd = TRUE; /* alias */ | |
870f6ba8 TF |
2209 | else if (strcmpic(ss, US"per_conn") == 0) per_conn = TRUE; |
2210 | else if (strcmpic(ss, US"per_mail") == 0) per_mail = TRUE; | |
8f240103 | 2211 | else key = string_sprintf("%s", ss); |
870f6ba8 | 2212 | } |
8f240103 | 2213 | |
870f6ba8 TF |
2214 | if (leaky + strict > 1 || per_byte + per_cmd + per_conn + per_mail > 1) |
2215 | { | |
2216 | *log_msgptr = US"conflicting options for \"ratelimit\" condition"; | |
2217 | return ERROR; | |
2218 | } | |
2219 | ||
2220 | /* Default option values */ | |
8f240103 | 2221 | |
870f6ba8 TF |
2222 | if (!strict) leaky = TRUE; |
2223 | if (!per_byte && !per_cmd && !per_conn) per_mail = TRUE; | |
2224 | ||
8f240103 PH |
2225 | /* Create the lookup key. If there is no explicit key, use sender_host_address. |
2226 | If there is no sender_host_address (e.g. -bs or acl_not_smtp) then we simply | |
2227 | omit it. The smoothing constant (sender_rate_period) and the per_xxx options | |
2228 | are added to the key because they alter the meaning of the stored data. */ | |
2229 | ||
2230 | if (key == NULL) | |
2231 | key = (sender_host_address == NULL)? US"" : sender_host_address; | |
870f6ba8 | 2232 | |
8f240103 PH |
2233 | key = string_sprintf("%s/%s/%s/%s", |
2234 | sender_rate_period, | |
2235 | per_byte? US"per_byte" : | |
2236 | per_cmd? US"per_cmd" : | |
2237 | per_mail? US"per_mail" : US"per_conn", | |
2238 | strict? US"strict" : US"leaky", | |
2239 | key); | |
870f6ba8 TF |
2240 | |
2241 | HDEBUG(D_acl) debug_printf("ratelimit condition limit=%.0f period=%.0f key=%s\n", | |
2242 | limit, period, key); | |
2243 | ||
8f240103 PH |
2244 | /* See if we have already computed the rate by looking in the relevant tree. |
2245 | For per-connection rate limiting, store tree nodes and dbdata in the permanent | |
2246 | pool so that they survive across resets. */ | |
870f6ba8 TF |
2247 | |
2248 | anchor = NULL; | |
2249 | old_pool = store_pool; | |
2250 | ||
2251 | if (per_conn) | |
2252 | { | |
2253 | anchor = &ratelimiters_conn; | |
2254 | store_pool = POOL_PERM; | |
2255 | } | |
fe0dab11 | 2256 | else if (per_mail || per_byte) |
870f6ba8 | 2257 | anchor = &ratelimiters_mail; |
fe0dab11 TF |
2258 | else if (per_cmd) |
2259 | anchor = &ratelimiters_cmd; | |
870f6ba8 TF |
2260 | |
2261 | if (anchor != NULL && (t = tree_search(*anchor, key)) != NULL) | |
2262 | { | |
2263 | dbd = t->data.ptr; | |
2264 | /* The following few lines duplicate some of the code below. */ | |
8f240103 | 2265 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2266 | store_pool = old_pool; |
2267 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2268 | HDEBUG(D_acl) | |
2269 | debug_printf("ratelimit found pre-computed rate %s\n", sender_rate); | |
2270 | return rc; | |
2271 | } | |
2272 | ||
2273 | /* We aren't using a pre-computed rate, so get a previously recorded | |
8f240103 PH |
2274 | rate from the database, update it, and write it back when required. If there's |
2275 | no previous rate for this key, create one. */ | |
870f6ba8 TF |
2276 | |
2277 | dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE); | |
2278 | if (dbm == NULL) | |
2279 | { | |
2280 | store_pool = old_pool; | |
2281 | sender_rate = NULL; | |
2282 | HDEBUG(D_acl) debug_printf("ratelimit database not available\n"); | |
2283 | *log_msgptr = US"ratelimit database not available"; | |
2284 | return DEFER; | |
2285 | } | |
2286 | dbd = dbfn_read(dbm, key); | |
2287 | ||
2288 | gettimeofday(&tv, NULL); | |
2289 | ||
2290 | if (dbd == NULL) | |
2291 | { | |
2292 | HDEBUG(D_acl) debug_printf("ratelimit initializing new key's data\n"); | |
2293 | dbd = store_get(sizeof(dbdata_ratelimit)); | |
2294 | dbd->time_stamp = tv.tv_sec; | |
2295 | dbd->time_usec = tv.tv_usec; | |
2296 | dbd->rate = 0.0; | |
2297 | } | |
2298 | else | |
2299 | { | |
2300 | /* The smoothed rate is computed using an exponentially weighted moving | |
2301 | average adjusted for variable sampling intervals. The standard EWMA for | |
2302 | a fixed sampling interval is: f'(t) = (1 - a) * f(t) + a * f'(t - 1) | |
2303 | where f() is the measured value and f'() is the smoothed value. | |
2304 | ||
2305 | Old data decays out of the smoothed value exponentially, such that data n | |
2306 | samples old is multiplied by a^n. The exponential decay time constant p | |
2307 | is defined such that data p samples old is multiplied by 1/e, which means | |
2308 | that a = exp(-1/p). We can maintain the same time constant for a variable | |
2309 | sampling interval i by using a = exp(-i/p). | |
2310 | ||
2311 | The rate we are measuring is messages per period, suitable for directly | |
2312 | comparing with the limit. The average rate between now and the previous | |
2313 | message is period / interval, which we feed into the EWMA as the sample. | |
2314 | ||
2315 | It turns out that the number of messages required for the smoothed rate | |
2316 | to reach the limit when they are sent in a burst is equal to the limit. | |
2317 | This can be seen by analysing the value of the smoothed rate after N | |
2318 | messages sent at even intervals. Let k = (1 - a) * p/i | |
2319 | ||
2320 | rate_1 = (1 - a) * p/i + a * rate_0 | |
2321 | = k + a * rate_0 | |
2322 | rate_2 = k + a * rate_1 | |
2323 | = k + a * k + a^2 * rate_0 | |
2324 | rate_3 = k + a * k + a^2 * k + a^3 * rate_0 | |
2325 | rate_N = rate_0 * a^N + k * SUM(x=0..N-1)(a^x) | |
2326 | = rate_0 * a^N + k * (1 - a^N) / (1 - a) | |
2327 | = rate_0 * a^N + p/i * (1 - a^N) | |
2328 | ||
2329 | When N is large, a^N -> 0 so rate_N -> p/i as desired. | |
2330 | ||
2331 | rate_N = p/i + (rate_0 - p/i) * a^N | |
2332 | a^N = (rate_N - p/i) / (rate_0 - p/i) | |
2333 | N * -i/p = log((rate_N - p/i) / (rate_0 - p/i)) | |
2334 | N = p/i * log((rate_0 - p/i) / (rate_N - p/i)) | |
2335 | ||
2336 | Numerical analysis of the above equation, setting the computed rate to | |
2337 | increase from rate_0 = 0 to rate_N = limit, shows that for large sending | |
2338 | rates, p/i, the number of messages N = limit. So limit serves as both the | |
2339 | maximum rate measured in messages per period, and the maximum number of | |
2340 | messages that can be sent in a fast burst. */ | |
2341 | ||
2342 | double this_time = (double)tv.tv_sec | |
2343 | + (double)tv.tv_usec / 1000000.0; | |
2344 | double prev_time = (double)dbd->time_stamp | |
2345 | + (double)dbd->time_usec / 1000000.0; | |
870f6ba8 TF |
2346 | |
2347 | /* We must avoid division by zero, and deal gracefully with the clock going | |
2348 | backwards. If we blunder ahead when time is in reverse then the computed | |
e5d5a95f | 2349 | rate will be bogus. To be safe we clamp interval to a very small number. */ |
870f6ba8 | 2350 | |
e5d5a95f TF |
2351 | double interval = this_time - prev_time <= 0.0 ? 1e-9 |
2352 | : this_time - prev_time; | |
2353 | ||
2354 | double i_over_p = interval / period; | |
2355 | double a = exp(-i_over_p); | |
870f6ba8 TF |
2356 | |
2357 | dbd->time_stamp = tv.tv_sec; | |
2358 | dbd->time_usec = tv.tv_usec; | |
2359 | ||
2360 | /* If we are measuring the rate in bytes per period, multiply the | |
2361 | measured rate by the message size. If we don't know the message size | |
2362 | then it's safe to just use a value of zero and let the recorded rate | |
2363 | decay as if nothing happened. */ | |
2364 | ||
2365 | if (per_byte) | |
2366 | dbd->rate = (message_size < 0 ? 0.0 : (double)message_size) | |
2367 | * (1 - a) / i_over_p + a * dbd->rate; | |
90fc3069 TF |
2368 | else if (per_cmd && where == ACL_WHERE_NOTSMTP) |
2369 | dbd->rate = (double)recipients_count | |
2370 | * (1 - a) / i_over_p + a * dbd->rate; | |
870f6ba8 TF |
2371 | else |
2372 | dbd->rate = (1 - a) / i_over_p + a * dbd->rate; | |
2373 | } | |
2374 | ||
3348576f TF |
2375 | /* Clients sending at the limit are considered to be over the limit. This |
2376 | matters for edge cases such the first message sent by a client (which gets | |
2377 | the initial rate of 0.0) when the rate limit is zero (i.e. the client should | |
2378 | be completely blocked). */ | |
2379 | ||
8f240103 | 2380 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2381 | |
2382 | /* Update the state if the rate is low or if we are being strict. If we | |
2383 | are in leaky mode and the sender's rate is too high, we do not update | |
2384 | the recorded rate in order to avoid an over-aggressive sender's retry | |
8f240103 PH |
2385 | rate preventing them from getting any email through. If noupdate is set, |
2386 | do not do any updates. */ | |
870f6ba8 | 2387 | |
8f240103 PH |
2388 | if ((rc == FAIL || !leaky) && !noupdate) |
2389 | { | |
870f6ba8 | 2390 | dbfn_write(dbm, key, dbd, sizeof(dbdata_ratelimit)); |
8f240103 PH |
2391 | HDEBUG(D_acl) debug_printf("ratelimit db updated\n"); |
2392 | } | |
2393 | else | |
2394 | { | |
2395 | HDEBUG(D_acl) debug_printf("ratelimit db not updated: %s\n", | |
2396 | noupdate? "noupdate set" : "over the limit, but leaky"); | |
2397 | } | |
2398 | ||
870f6ba8 TF |
2399 | dbfn_close(dbm); |
2400 | ||
2401 | /* Store the result in the tree for future reference, if necessary. */ | |
2402 | ||
8f240103 | 2403 | if (anchor != NULL && !noupdate) |
870f6ba8 TF |
2404 | { |
2405 | t = store_get(sizeof(tree_node) + Ustrlen(key)); | |
2406 | t->data.ptr = dbd; | |
2407 | Ustrcpy(t->name, key); | |
2408 | (void)tree_insertnode(anchor, t); | |
2409 | } | |
2410 | ||
2411 | /* We create the formatted version of the sender's rate very late in | |
2412 | order to ensure that it is done using the correct storage pool. */ | |
2413 | ||
2414 | store_pool = old_pool; | |
2415 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2416 | ||
2417 | HDEBUG(D_acl) | |
2418 | debug_printf("ratelimit computed rate %s\n", sender_rate); | |
2419 | ||
2420 | return rc; | |
2421 | } | |
2422 | ||
2423 | ||
2424 | ||
059ec3d9 PH |
2425 | /************************************************* |
2426 | * Handle conditions/modifiers on an ACL item * | |
2427 | *************************************************/ | |
2428 | ||
2429 | /* Called from acl_check() below. | |
2430 | ||
2431 | Arguments: | |
2432 | verb ACL verb | |
2433 | cb ACL condition block - if NULL, result is OK | |
2434 | where where called from | |
2435 | addr the address being checked for RCPT, or NULL | |
2436 | level the nesting level | |
2437 | epp pointer to pass back TRUE if "endpass" encountered | |
2438 | (applies only to "accept" and "discard") | |
2439 | user_msgptr user message pointer | |
2440 | log_msgptr log message pointer | |
2441 | basic_errno pointer to where to put verify error | |
2442 | ||
2443 | Returns: OK - all conditions are met | |
2444 | DISCARD - an "acl" condition returned DISCARD - only allowed | |
2445 | for "accept" or "discard" verbs | |
2446 | FAIL - at least one condition fails | |
2447 | FAIL_DROP - an "acl" condition returned FAIL_DROP | |
2448 | DEFER - can't tell at the moment (typically, lookup defer, | |
2449 | but can be temporary callout problem) | |
2450 | ERROR - ERROR from nested ACL or expansion failure or other | |
2451 | error | |
2452 | */ | |
2453 | ||
2454 | static int | |
2455 | acl_check_condition(int verb, acl_condition_block *cb, int where, | |
2456 | address_item *addr, int level, BOOL *epp, uschar **user_msgptr, | |
2457 | uschar **log_msgptr, int *basic_errno) | |
2458 | { | |
2459 | uschar *user_message = NULL; | |
2460 | uschar *log_message = NULL; | |
91ecef39 | 2461 | uschar *p = NULL; |
059ec3d9 | 2462 | int rc = OK; |
8523533c TK |
2463 | #ifdef WITH_CONTENT_SCAN |
2464 | int sep = '/'; | |
2465 | #endif | |
059ec3d9 PH |
2466 | |
2467 | for (; cb != NULL; cb = cb->next) | |
2468 | { | |
2469 | uschar *arg; | |
8e669ac1 | 2470 | int control_type; |
059ec3d9 PH |
2471 | |
2472 | /* The message and log_message items set up messages to be used in | |
2473 | case of rejection. They are expanded later. */ | |
2474 | ||
2475 | if (cb->type == ACLC_MESSAGE) | |
2476 | { | |
2477 | user_message = cb->arg; | |
2478 | continue; | |
2479 | } | |
2480 | ||
2481 | if (cb->type == ACLC_LOG_MESSAGE) | |
2482 | { | |
2483 | log_message = cb->arg; | |
2484 | continue; | |
2485 | } | |
2486 | ||
2487 | /* The endpass "condition" just sets a flag to show it occurred. This is | |
2488 | checked at compile time to be on an "accept" or "discard" item. */ | |
2489 | ||
2490 | if (cb->type == ACLC_ENDPASS) | |
2491 | { | |
2492 | *epp = TRUE; | |
2493 | continue; | |
2494 | } | |
2495 | ||
2496 | /* For other conditions and modifiers, the argument is expanded now for some | |
2497 | of them, but not for all, because expansion happens down in some lower level | |
2498 | checking functions in some cases. */ | |
2499 | ||
2500 | if (cond_expand_at_top[cb->type]) | |
2501 | { | |
2502 | arg = expand_string(cb->arg); | |
2503 | if (arg == NULL) | |
2504 | { | |
2505 | if (expand_string_forcedfail) continue; | |
2506 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
2507 | cb->arg, expand_string_message); | |
2508 | return search_find_defer? DEFER : ERROR; | |
2509 | } | |
2510 | } | |
2511 | else arg = cb->arg; | |
2512 | ||
2513 | /* Show condition, and expanded condition if it's different */ | |
2514 | ||
2515 | HDEBUG(D_acl) | |
2516 | { | |
2517 | int lhswidth = 0; | |
2518 | debug_printf("check %s%s %n", | |
2519 | (!cond_modifiers[cb->type] && cb->u.negated)? "!":"", | |
2520 | conditions[cb->type], &lhswidth); | |
2521 | ||
2522 | if (cb->type == ACLC_SET) | |
2523 | { | |
38a0a95f PH |
2524 | debug_printf("acl_%s ", cb->u.varname); |
2525 | lhswidth += 5 + Ustrlen(cb->u.varname); | |
059ec3d9 PH |
2526 | } |
2527 | ||
2528 | debug_printf("= %s\n", cb->arg); | |
2529 | ||
2530 | if (arg != cb->arg) | |
2531 | debug_printf("%.*s= %s\n", lhswidth, | |
2532 | US" ", CS arg); | |
2533 | } | |
2534 | ||
2535 | /* Check that this condition makes sense at this time */ | |
2536 | ||
2537 | if ((cond_forbids[cb->type] & (1 << where)) != 0) | |
2538 | { | |
2539 | *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL", | |
2540 | cond_modifiers[cb->type]? "use" : "test", | |
2541 | conditions[cb->type], acl_wherenames[where]); | |
2542 | return ERROR; | |
2543 | } | |
2544 | ||
2545 | /* Run the appropriate test for each condition, or take the appropriate | |
2546 | action for the remaining modifiers. */ | |
2547 | ||
2548 | switch(cb->type) | |
2549 | { | |
71fafd95 PH |
2550 | case ACLC_ADD_HEADER: |
2551 | setup_header(arg); | |
2552 | break; | |
2553 | ||
059ec3d9 PH |
2554 | /* A nested ACL that returns "discard" makes sense only for an "accept" or |
2555 | "discard" verb. */ | |
71fafd95 | 2556 | |
059ec3d9 PH |
2557 | case ACLC_ACL: |
2558 | rc = acl_check_internal(where, addr, arg, level+1, user_msgptr, log_msgptr); | |
2559 | if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD) | |
2560 | { | |
2561 | *log_msgptr = string_sprintf("nested ACL returned \"discard\" for " | |
2562 | "\"%s\" command (only allowed with \"accept\" or \"discard\")", | |
2563 | verbs[verb]); | |
2564 | return ERROR; | |
2565 | } | |
2566 | break; | |
2567 | ||
2568 | case ACLC_AUTHENTICATED: | |
2569 | rc = (sender_host_authenticated == NULL)? FAIL : | |
2570 | match_isinlist(sender_host_authenticated, &arg, 0, NULL, NULL, MCL_STRING, | |
2571 | TRUE, NULL); | |
2572 | break; | |
2573 | ||
71fafd95 | 2574 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
8523533c TK |
2575 | case ACLC_BMI_OPTIN: |
2576 | { | |
2577 | int old_pool = store_pool; | |
2578 | store_pool = POOL_PERM; | |
2579 | bmi_current_optin = string_copy(arg); | |
2580 | store_pool = old_pool; | |
2581 | } | |
2582 | break; | |
71fafd95 | 2583 | #endif |
8523533c | 2584 | |
059ec3d9 PH |
2585 | case ACLC_CONDITION: |
2586 | if (Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */ | |
2587 | rc = (Uatoi(arg) == 0)? FAIL : OK; | |
2588 | else | |
2589 | rc = (strcmpic(arg, US"no") == 0 || | |
2590 | strcmpic(arg, US"false") == 0)? FAIL : | |
2591 | (strcmpic(arg, US"yes") == 0 || | |
2592 | strcmpic(arg, US"true") == 0)? OK : DEFER; | |
2593 | if (rc == DEFER) | |
2594 | *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg); | |
2595 | break; | |
2596 | ||
c3611384 PH |
2597 | case ACLC_CONTINUE: /* Always succeeds */ |
2598 | break; | |
2599 | ||
059ec3d9 | 2600 | case ACLC_CONTROL: |
c5fcb476 PH |
2601 | control_type = decode_control(arg, &p, where, log_msgptr); |
2602 | ||
8523533c | 2603 | /* Check if this control makes sense at this time */ |
c5fcb476 PH |
2604 | |
2605 | if ((control_forbids[control_type] & (1 << where)) != 0) | |
2606 | { | |
2607 | *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL", | |
2608 | controls[control_type], acl_wherenames[where]); | |
2609 | return ERROR; | |
8e669ac1 | 2610 | } |
c5fcb476 PH |
2611 | |
2612 | switch(control_type) | |
059ec3d9 | 2613 | { |
c46782ef PH |
2614 | case CONTROL_AUTH_UNADVERTISED: |
2615 | allow_auth_unadvertised = TRUE; | |
2616 | break; | |
2617 | ||
2618 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
8523533c TK |
2619 | case CONTROL_BMI_RUN: |
2620 | bmi_run = 1; | |
2621 | break; | |
c46782ef PH |
2622 | #endif |
2623 | ||
2624 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
fb2274d4 TK |
2625 | case CONTROL_DK_VERIFY: |
2626 | dk_do_verify = 1; | |
2627 | break; | |
c46782ef PH |
2628 | #endif |
2629 | ||
f7572e5a TK |
2630 | #ifdef EXPERIMENTAL_DKIM |
2631 | case CONTROL_DKIM_VERIFY: | |
2632 | dkim_do_verify = 1; | |
2633 | break; | |
2634 | #endif | |
2635 | ||
059ec3d9 PH |
2636 | case CONTROL_ERROR: |
2637 | return ERROR; | |
2638 | ||
2639 | case CONTROL_CASEFUL_LOCAL_PART: | |
2640 | deliver_localpart = addr->cc_local_part; | |
2641 | break; | |
2642 | ||
2643 | case CONTROL_CASELOWER_LOCAL_PART: | |
2644 | deliver_localpart = addr->lc_local_part; | |
2645 | break; | |
2646 | ||
2647 | case CONTROL_ENFORCE_SYNC: | |
2648 | smtp_enforce_sync = TRUE; | |
2649 | break; | |
2650 | ||
2651 | case CONTROL_NO_ENFORCE_SYNC: | |
2652 | smtp_enforce_sync = FALSE; | |
2653 | break; | |
2654 | ||
c46782ef | 2655 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
2656 | case CONTROL_NO_MBOX_UNSPOOL: |
2657 | no_mbox_unspool = TRUE; | |
2658 | break; | |
c46782ef | 2659 | #endif |
8523533c | 2660 | |
059ec3d9 PH |
2661 | case CONTROL_NO_MULTILINE: |
2662 | no_multiline_responses = TRUE; | |
2663 | break; | |
2664 | ||
cf8b11a5 PH |
2665 | case CONTROL_NO_PIPELINING: |
2666 | pipelining_enable = FALSE; | |
2667 | break; | |
2668 | ||
047bdd8c PH |
2669 | case CONTROL_NO_DELAY_FLUSH: |
2670 | disable_delay_flush = TRUE; | |
2671 | break; | |
2672 | ||
4c590bd1 PH |
2673 | case CONTROL_NO_CALLOUT_FLUSH: |
2674 | disable_callout_flush = TRUE; | |
2675 | break; | |
2676 | ||
29aba418 | 2677 | case CONTROL_FAKEDEFER: |
8523533c | 2678 | case CONTROL_FAKEREJECT: |
29aba418 | 2679 | fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL; |
8523533c | 2680 | if (*p == '/') |
8e669ac1 | 2681 | { |
8523533c | 2682 | uschar *pp = p + 1; |
8e669ac1 | 2683 | while (*pp != 0) pp++; |
29aba418 | 2684 | fake_response_text = expand_string(string_copyn(p+1, pp-p-1)); |
8523533c TK |
2685 | p = pp; |
2686 | } | |
2687 | else | |
2688 | { | |
2689 | /* Explicitly reset to default string */ | |
29aba418 | 2690 | 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 |
2691 | } |
2692 | break; | |
8523533c | 2693 | |
059ec3d9 PH |
2694 | case CONTROL_FREEZE: |
2695 | deliver_freeze = TRUE; | |
2696 | deliver_frozen_at = time(NULL); | |
6a3f1455 PH |
2697 | freeze_tell = freeze_tell_config; /* Reset to configured value */ |
2698 | if (Ustrncmp(p, "/no_tell", 8) == 0) | |
2699 | { | |
2700 | p += 8; | |
2701 | freeze_tell = NULL; | |
2702 | } | |
2703 | if (*p != 0) | |
2704 | { | |
2705 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2706 | return ERROR; | |
2707 | } | |
059ec3d9 PH |
2708 | break; |
2709 | ||
2710 | case CONTROL_QUEUE_ONLY: | |
2711 | queue_only_policy = TRUE; | |
2712 | break; | |
2713 | ||
2714 | case CONTROL_SUBMISSION: | |
87ba3f5f | 2715 | originator_name = US""; |
059ec3d9 | 2716 | submission_mode = TRUE; |
69358f02 | 2717 | while (*p == '/') |
8e669ac1 | 2718 | { |
69358f02 PH |
2719 | if (Ustrncmp(p, "/sender_retain", 14) == 0) |
2720 | { | |
2721 | p += 14; | |
2722 | active_local_sender_retain = TRUE; | |
8e669ac1 PH |
2723 | active_local_from_check = FALSE; |
2724 | } | |
69358f02 PH |
2725 | else if (Ustrncmp(p, "/domain=", 8) == 0) |
2726 | { | |
2727 | uschar *pp = p + 8; | |
8e669ac1 | 2728 | while (*pp != 0 && *pp != '/') pp++; |
87ba3f5f PH |
2729 | submission_domain = string_copyn(p+8, pp-p-8); |
2730 | p = pp; | |
2731 | } | |
8857ccfd PH |
2732 | /* The name= option must be last, because it swallows the rest of |
2733 | the string. */ | |
87ba3f5f PH |
2734 | else if (Ustrncmp(p, "/name=", 6) == 0) |
2735 | { | |
2736 | uschar *pp = p + 6; | |
8857ccfd | 2737 | while (*pp != 0) pp++; |
2fe1a124 | 2738 | submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6, |
87ba3f5f | 2739 | big_buffer, big_buffer_size)); |
8e669ac1 | 2740 | p = pp; |
69358f02 | 2741 | } |
8e669ac1 PH |
2742 | else break; |
2743 | } | |
69358f02 | 2744 | if (*p != 0) |
059ec3d9 | 2745 | { |
69358f02 | 2746 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); |
059ec3d9 PH |
2747 | return ERROR; |
2748 | } | |
2749 | break; | |
8800895a PH |
2750 | |
2751 | case CONTROL_SUPPRESS_LOCAL_FIXUPS: | |
2752 | suppress_local_fixups = TRUE; | |
2753 | break; | |
059ec3d9 PH |
2754 | } |
2755 | break; | |
2756 | ||
71fafd95 | 2757 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
2758 | case ACLC_DECODE: |
2759 | rc = mime_decode(&arg); | |
2760 | break; | |
71fafd95 | 2761 | #endif |
8523533c | 2762 | |
059ec3d9 PH |
2763 | case ACLC_DELAY: |
2764 | { | |
2765 | int delay = readconf_readtime(arg, 0, FALSE); | |
2766 | if (delay < 0) | |
2767 | { | |
2768 | *log_msgptr = string_sprintf("syntax error in argument for \"delay\" " | |
2769 | "modifier: \"%s\" is not a time value", arg); | |
2770 | return ERROR; | |
2771 | } | |
2772 | else | |
2773 | { | |
2774 | HDEBUG(D_acl) debug_printf("delay modifier requests %d-second delay\n", | |
2775 | delay); | |
2776 | if (host_checking) | |
2777 | { | |
2778 | HDEBUG(D_acl) | |
2779 | debug_printf("delay skipped in -bh checking mode\n"); | |
2780 | } | |
010c2d14 PH |
2781 | |
2782 | /* It appears to be impossible to detect that a TCP/IP connection has | |
2783 | gone away without reading from it. This means that we cannot shorten | |
2784 | the delay below if the client goes away, because we cannot discover | |
2785 | that the client has closed its end of the connection. (The connection | |
2786 | is actually in a half-closed state, waiting for the server to close its | |
2787 | end.) It would be nice to be able to detect this state, so that the | |
2788 | Exim process is not held up unnecessarily. However, it seems that we | |
2789 | can't. The poll() function does not do the right thing, and in any case | |
2790 | it is not always available. | |
2791 | ||
047bdd8c | 2792 | NOTE 1: If ever this state of affairs changes, remember that we may be |
010c2d14 | 2793 | dealing with stdin/stdout here, in addition to TCP/IP connections. |
047bdd8c PH |
2794 | Also, delays may be specified for non-SMTP input, where smtp_out and |
2795 | smtp_in will be NULL. Whatever is done must work in all cases. | |
2796 | ||
2797 | NOTE 2: The added feature of flushing the output before a delay must | |
2798 | apply only to SMTP input. Hence the test for smtp_out being non-NULL. | |
2799 | */ | |
010c2d14 | 2800 | |
8e669ac1 | 2801 | else |
86b8287f | 2802 | { |
14f4a80d | 2803 | if (smtp_out != NULL && !disable_delay_flush) mac_smtp_fflush(); |
86b8287f | 2804 | while (delay > 0) delay = sleep(delay); |
8e669ac1 | 2805 | } |
059ec3d9 PH |
2806 | } |
2807 | } | |
2808 | break; | |
2809 | ||
71fafd95 | 2810 | #ifdef WITH_OLD_DEMIME |
8523533c TK |
2811 | case ACLC_DEMIME: |
2812 | rc = demime(&arg); | |
2813 | break; | |
71fafd95 | 2814 | #endif |
8523533c | 2815 | |
71fafd95 PH |
2816 | #ifdef EXPERIMENTAL_DOMAINKEYS |
2817 | case ACLC_DK_DOMAIN_SOURCE: | |
fb2274d4 TK |
2818 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2819 | /* check header source of domain against given string */ | |
2820 | switch (dk_verify_block->address_source) { | |
2821 | case DK_EXIM_ADDRESS_FROM_FROM: | |
2822 | rc = match_isinlist(US"from", &arg, 0, NULL, | |
2823 | NULL, MCL_STRING, TRUE, NULL); | |
2824 | break; | |
2825 | case DK_EXIM_ADDRESS_FROM_SENDER: | |
2826 | rc = match_isinlist(US"sender", &arg, 0, NULL, | |
2827 | NULL, MCL_STRING, TRUE, NULL); | |
2828 | break; | |
2829 | case DK_EXIM_ADDRESS_NONE: | |
2830 | rc = match_isinlist(US"none", &arg, 0, NULL, | |
2831 | NULL, MCL_STRING, TRUE, NULL); | |
2832 | break; | |
71fafd95 PH |
2833 | } |
2834 | break; | |
2835 | ||
2836 | case ACLC_DK_POLICY: | |
fb2274d4 TK |
2837 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2838 | /* check policy against given string, default FAIL */ | |
2839 | rc = FAIL; | |
2840 | if (dk_verify_block->signsall) | |
2841 | rc = match_isinlist(US"signsall", &arg, 0, NULL, | |
2842 | NULL, MCL_STRING, TRUE, NULL); | |
2843 | if (dk_verify_block->testing) | |
2844 | rc = match_isinlist(US"testing", &arg, 0, NULL, | |
2845 | NULL, MCL_STRING, TRUE, NULL); | |
71fafd95 PH |
2846 | break; |
2847 | ||
2848 | case ACLC_DK_SENDER_DOMAINS: | |
fb2274d4 TK |
2849 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2850 | if (dk_verify_block->domain != NULL) | |
2851 | rc = match_isinlist(dk_verify_block->domain, &arg, 0, &domainlist_anchor, | |
2852 | NULL, MCL_DOMAIN, TRUE, NULL); | |
2853 | else rc = FAIL; | |
71fafd95 PH |
2854 | break; |
2855 | ||
2856 | case ACLC_DK_SENDER_LOCAL_PARTS: | |
fb2274d4 TK |
2857 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2858 | if (dk_verify_block->local_part != NULL) | |
2859 | rc = match_isinlist(dk_verify_block->local_part, &arg, 0, &localpartlist_anchor, | |
2860 | NULL, MCL_LOCALPART, TRUE, NULL); | |
2861 | else rc = FAIL; | |
71fafd95 PH |
2862 | break; |
2863 | ||
2864 | case ACLC_DK_SENDERS: | |
fb2274d4 TK |
2865 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2866 | if (dk_verify_block->address != NULL) | |
2867 | rc = match_address_list(dk_verify_block->address, TRUE, TRUE, &arg, NULL, -1, 0, NULL); | |
2868 | else rc = FAIL; | |
71fafd95 PH |
2869 | break; |
2870 | ||
2871 | case ACLC_DK_STATUS: | |
fb2274d4 TK |
2872 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2873 | if (dk_verify_block->result > 0) { | |
2874 | switch(dk_verify_block->result) { | |
2875 | case DK_EXIM_RESULT_BAD_FORMAT: | |
2876 | rc = match_isinlist(US"bad format", &arg, 0, NULL, | |
2877 | NULL, MCL_STRING, TRUE, NULL); | |
2878 | break; | |
2879 | case DK_EXIM_RESULT_NO_KEY: | |
2880 | rc = match_isinlist(US"no key", &arg, 0, NULL, | |
2881 | NULL, MCL_STRING, TRUE, NULL); | |
2882 | break; | |
2883 | case DK_EXIM_RESULT_NO_SIGNATURE: | |
2884 | rc = match_isinlist(US"no signature", &arg, 0, NULL, | |
2885 | NULL, MCL_STRING, TRUE, NULL); | |
2886 | break; | |
2887 | case DK_EXIM_RESULT_REVOKED: | |
2888 | rc = match_isinlist(US"revoked", &arg, 0, NULL, | |
2889 | NULL, MCL_STRING, TRUE, NULL); | |
2890 | break; | |
2891 | case DK_EXIM_RESULT_NON_PARTICIPANT: | |
2892 | rc = match_isinlist(US"non-participant", &arg, 0, NULL, | |
2893 | NULL, MCL_STRING, TRUE, NULL); | |
2894 | break; | |
2895 | case DK_EXIM_RESULT_GOOD: | |
2896 | rc = match_isinlist(US"good", &arg, 0, NULL, | |
2897 | NULL, MCL_STRING, TRUE, NULL); | |
2898 | break; | |
2899 | case DK_EXIM_RESULT_BAD: | |
2900 | rc = match_isinlist(US"bad", &arg, 0, NULL, | |
2901 | NULL, MCL_STRING, TRUE, NULL); | |
2902 | break; | |
71fafd95 | 2903 | } |
fb2274d4 | 2904 | } |
71fafd95 PH |
2905 | break; |
2906 | #endif | |
fb2274d4 | 2907 | |
059ec3d9 PH |
2908 | case ACLC_DNSLISTS: |
2909 | rc = verify_check_dnsbl(&arg); | |
2910 | break; | |
2911 | ||
2912 | case ACLC_DOMAINS: | |
2913 | rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor, | |
2914 | addr->domain_cache, MCL_DOMAIN, TRUE, &deliver_domain_data); | |
2915 | break; | |
2916 | ||
2917 | /* The value in tls_cipher is the full cipher name, for example, | |
2918 | TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the | |
2919 | cipher names such as DES-CBC3-SHA. But program defensively. We don't know | |
2920 | what may in practice come out of the SSL library - which at the time of | |
2921 | writing is poorly documented. */ | |
2922 | ||
2923 | case ACLC_ENCRYPTED: | |
2924 | if (tls_cipher == NULL) rc = FAIL; else | |
2925 | { | |
2926 | uschar *endcipher = NULL; | |
2927 | uschar *cipher = Ustrchr(tls_cipher, ':'); | |
2928 | if (cipher == NULL) cipher = tls_cipher; else | |
2929 | { | |
2930 | endcipher = Ustrchr(++cipher, ':'); | |
2931 | if (endcipher != NULL) *endcipher = 0; | |
2932 | } | |
2933 | rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL); | |
2934 | if (endcipher != NULL) *endcipher = ':'; | |
2935 | } | |
2936 | break; | |
2937 | ||
2938 | /* Use verify_check_this_host() instead of verify_check_host() so that | |
2939 | we can pass over &host_data to catch any looked up data. Once it has been | |
2940 | set, it retains its value so that it's still there if another ACL verb | |
2941 | comes through here and uses the cache. However, we must put it into | |
2942 | permanent store in case it is also expected to be used in a subsequent | |
2943 | message in the same SMTP connection. */ | |
2944 | ||
2945 | case ACLC_HOSTS: | |
2946 | rc = verify_check_this_host(&arg, sender_host_cache, NULL, | |
2947 | (sender_host_address == NULL)? US"" : sender_host_address, &host_data); | |
2948 | if (host_data != NULL) host_data = string_copy_malloc(host_data); | |
2949 | break; | |
2950 | ||
2951 | case ACLC_LOCAL_PARTS: | |
2952 | rc = match_isinlist(addr->cc_local_part, &arg, 0, | |
2953 | &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE, | |
2954 | &deliver_localpart_data); | |
2955 | break; | |
2956 | ||
6ea85e9a PH |
2957 | case ACLC_LOG_REJECT_TARGET: |
2958 | { | |
2959 | int logbits = 0; | |
2960 | int sep = 0; | |
2961 | uschar *s = arg; | |
2962 | uschar *ss; | |
2963 | while ((ss = string_nextinlist(&s, &sep, big_buffer, big_buffer_size)) | |
2964 | != NULL) | |
2965 | { | |
2966 | if (Ustrcmp(ss, "main") == 0) logbits |= LOG_MAIN; | |
2967 | else if (Ustrcmp(ss, "panic") == 0) logbits |= LOG_PANIC; | |
2968 | else if (Ustrcmp(ss, "reject") == 0) logbits |= LOG_REJECT; | |
2969 | else | |
2970 | { | |
2971 | logbits |= LOG_MAIN|LOG_REJECT; | |
2972 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown log name \"%s\" in " | |
2973 | "\"log_reject_target\" in %s ACL", ss, acl_wherenames[where]); | |
2974 | } | |
2975 | } | |
2976 | log_reject_target = logbits; | |
2977 | } | |
2978 | break; | |
2979 | ||
059ec3d9 PH |
2980 | case ACLC_LOGWRITE: |
2981 | { | |
2982 | int logbits = 0; | |
2983 | uschar *s = arg; | |
2984 | if (*s == ':') | |
2985 | { | |
2986 | s++; | |
2987 | while (*s != ':') | |
2988 | { | |
2989 | if (Ustrncmp(s, "main", 4) == 0) | |
2990 | { logbits |= LOG_MAIN; s += 4; } | |
2991 | else if (Ustrncmp(s, "panic", 5) == 0) | |
2992 | { logbits |= LOG_PANIC; s += 5; } | |
2993 | else if (Ustrncmp(s, "reject", 6) == 0) | |
2994 | { logbits |= LOG_REJECT; s += 6; } | |
2995 | else | |
2996 | { | |
2997 | logbits = LOG_MAIN|LOG_PANIC; | |
2998 | s = string_sprintf(":unknown log name in \"%s\" in " | |
2999 | "\"logwrite\" in %s ACL", arg, acl_wherenames[where]); | |
3000 | } | |
3001 | if (*s == ',') s++; | |
3002 | } | |
3003 | s++; | |
3004 | } | |
3005 | while (isspace(*s)) s++; | |
6ea85e9a PH |
3006 | |
3007 | ||
059ec3d9 PH |
3008 | if (logbits == 0) logbits = LOG_MAIN; |
3009 | log_write(0, logbits, "%s", string_printing(s)); | |
3010 | } | |
3011 | break; | |
8e669ac1 | 3012 | |
71fafd95 | 3013 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3014 | case ACLC_MALWARE: |
3015 | { | |
6ea85e9a | 3016 | /* Separate the regular expression and any optional parameters. */ |
8523533c TK |
3017 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); |
3018 | /* Run the malware backend. */ | |
3019 | rc = malware(&ss); | |
3020 | /* Modify return code based upon the existance of options. */ | |
3021 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
3022 | != NULL) { | |
3023 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
3024 | { | |
3025 | /* FAIL so that the message is passed to the next ACL */ | |
3026 | rc = FAIL; | |
3027 | } | |
3028 | } | |
3029 | } | |
3030 | break; | |
3031 | ||
3032 | case ACLC_MIME_REGEX: | |
71fafd95 | 3033 | rc = mime_regex(&arg); |
8523533c | 3034 | break; |
71fafd95 | 3035 | #endif |
059ec3d9 | 3036 | |
870f6ba8 | 3037 | case ACLC_RATELIMIT: |
90fc3069 | 3038 | rc = acl_ratelimit(arg, where, log_msgptr); |
870f6ba8 TF |
3039 | break; |
3040 | ||
059ec3d9 PH |
3041 | case ACLC_RECIPIENTS: |
3042 | rc = match_address_list(addr->address, TRUE, TRUE, &arg, NULL, -1, 0, | |
3043 | &recipient_data); | |
3044 | break; | |
3045 | ||
71fafd95 PH |
3046 | #ifdef WITH_CONTENT_SCAN |
3047 | case ACLC_REGEX: | |
3048 | rc = regex(&arg); | |
8523533c | 3049 | break; |
71fafd95 | 3050 | #endif |
8523533c | 3051 | |
059ec3d9 PH |
3052 | case ACLC_SENDER_DOMAINS: |
3053 | { | |
3054 | uschar *sdomain; | |
3055 | sdomain = Ustrrchr(sender_address, '@'); | |
3056 | sdomain = (sdomain == NULL)? US"" : sdomain + 1; | |
3057 | rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor, | |
3058 | sender_domain_cache, MCL_DOMAIN, TRUE, NULL); | |
3059 | } | |
3060 | break; | |
3061 | ||
3062 | case ACLC_SENDERS: | |
3063 | rc = match_address_list(sender_address, TRUE, TRUE, &arg, | |
3064 | sender_address_cache, -1, 0, &sender_data); | |
3065 | break; | |
3066 | ||
3067 | /* Connection variables must persist forever */ | |
3068 | ||
3069 | case ACLC_SET: | |
3070 | { | |
3071 | int old_pool = store_pool; | |
38a0a95f PH |
3072 | if (cb->u.varname[0] == 'c') store_pool = POOL_PERM; |
3073 | acl_var_create(cb->u.varname)->data.ptr = string_copy(arg); | |
059ec3d9 PH |
3074 | store_pool = old_pool; |
3075 | } | |
3076 | break; | |
3077 | ||
71fafd95 | 3078 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3079 | case ACLC_SPAM: |
3080 | { | |
3081 | /* Seperate the regular expression and any optional parameters. */ | |
3082 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); | |
3083 | /* Run the spam backend. */ | |
3084 | rc = spam(&ss); | |
3085 | /* Modify return code based upon the existance of options. */ | |
3086 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
3087 | != NULL) { | |
3088 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
3089 | { | |
3090 | /* FAIL so that the message is passed to the next ACL */ | |
3091 | rc = FAIL; | |
3092 | } | |
3093 | } | |
3094 | } | |
3095 | break; | |
71fafd95 | 3096 | #endif |
8523533c | 3097 | |
71fafd95 | 3098 | #ifdef EXPERIMENTAL_SPF |
8523533c TK |
3099 | case ACLC_SPF: |
3100 | rc = spf_process(&arg, sender_address); | |
3101 | break; | |
71fafd95 | 3102 | #endif |
8523533c | 3103 | |
059ec3d9 PH |
3104 | /* If the verb is WARN, discard any user message from verification, because |
3105 | such messages are SMTP responses, not header additions. The latter come | |
475fe28a PH |
3106 | only from explicit "message" modifiers. However, put the user message into |
3107 | $acl_verify_message so it can be used in subsequent conditions or modifiers | |
3108 | (until something changes it). */ | |
059ec3d9 PH |
3109 | |
3110 | case ACLC_VERIFY: | |
3111 | rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno); | |
475fe28a | 3112 | acl_verify_message = *user_msgptr; |
059ec3d9 PH |
3113 | if (verb == ACL_WARN) *user_msgptr = NULL; |
3114 | break; | |
3115 | ||
3116 | default: | |
3117 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown " | |
3118 | "condition %d", cb->type); | |
3119 | break; | |
3120 | } | |
3121 | ||
3122 | /* If a condition was negated, invert OK/FAIL. */ | |
3123 | ||
3124 | if (!cond_modifiers[cb->type] && cb->u.negated) | |
3125 | { | |
3126 | if (rc == OK) rc = FAIL; | |
3127 | else if (rc == FAIL || rc == FAIL_DROP) rc = OK; | |
3128 | } | |
3129 | ||
3130 | if (rc != OK) break; /* Conditions loop */ | |
3131 | } | |
3132 | ||
3133 | ||
3134 | /* If the result is the one for which "message" and/or "log_message" are used, | |
4e88a19f PH |
3135 | handle the values of these modifiers. If there isn't a log message set, we make |
3136 | it the same as the user message. | |
059ec3d9 PH |
3137 | |
3138 | "message" is a user message that will be included in an SMTP response. Unless | |
3139 | it is empty, it overrides any previously set user message. | |
3140 | ||
3141 | "log_message" is a non-user message, and it adds to any existing non-user | |
3142 | message that is already set. | |
3143 | ||
4e88a19f PH |
3144 | Most verbs have but a single return for which the messages are relevant, but |
3145 | for "discard", it's useful to have the log message both when it succeeds and | |
3146 | when it fails. For "accept", the message is used in the OK case if there is no | |
3147 | "endpass", but (for backwards compatibility) in the FAIL case if "endpass" is | |
3148 | present. */ | |
059ec3d9 | 3149 | |
4e88a19f PH |
3150 | if (*epp && rc == OK) user_message = NULL; |
3151 | ||
3152 | if (((1<<rc) & msgcond[verb]) != 0) | |
059ec3d9 PH |
3153 | { |
3154 | uschar *expmessage; | |
4e88a19f PH |
3155 | uschar *old_user_msgptr = *user_msgptr; |
3156 | uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr; | |
059ec3d9 PH |
3157 | |
3158 | /* If the verb is "warn", messages generated by conditions (verification or | |
4e88a19f PH |
3159 | nested ACLs) are always discarded. This also happens for acceptance verbs |
3160 | when they actually do accept. Only messages specified at this level are used. | |
059ec3d9 PH |
3161 | However, the value of an existing message is available in $acl_verify_message |
3162 | during expansions. */ | |
3163 | ||
4e88a19f PH |
3164 | if (verb == ACL_WARN || |
3165 | (rc == OK && (verb == ACL_ACCEPT || verb == ACL_DISCARD))) | |
3166 | *log_msgptr = *user_msgptr = NULL; | |
059ec3d9 PH |
3167 | |
3168 | if (user_message != NULL) | |
3169 | { | |
3170 | acl_verify_message = old_user_msgptr; | |
3171 | expmessage = expand_string(user_message); | |
3172 | if (expmessage == NULL) | |
3173 | { | |
3174 | if (!expand_string_forcedfail) | |
3175 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3176 | user_message, expand_string_message); | |
3177 | } | |
3178 | else if (expmessage[0] != 0) *user_msgptr = expmessage; | |
3179 | } | |
3180 | ||
3181 | if (log_message != NULL) | |
3182 | { | |
3183 | acl_verify_message = old_log_msgptr; | |
3184 | expmessage = expand_string(log_message); | |
3185 | if (expmessage == NULL) | |
3186 | { | |
3187 | if (!expand_string_forcedfail) | |
3188 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3189 | log_message, expand_string_message); | |
3190 | } | |
3191 | else if (expmessage[0] != 0) | |
3192 | { | |
3193 | *log_msgptr = (*log_msgptr == NULL)? expmessage : | |
3194 | string_sprintf("%s: %s", expmessage, *log_msgptr); | |
3195 | } | |
3196 | } | |
3197 | ||
3198 | /* If no log message, default it to the user message */ | |
3199 | ||
3200 | if (*log_msgptr == NULL) *log_msgptr = *user_msgptr; | |
3201 | } | |
3202 | ||
3203 | acl_verify_message = NULL; | |
3204 | return rc; | |
3205 | } | |
3206 | ||
3207 | ||
3208 | ||
3209 | ||
3210 | ||
3211 | /************************************************* | |
3212 | * Get line from a literal ACL * | |
3213 | *************************************************/ | |
3214 | ||
3215 | /* This function is passed to acl_read() in order to extract individual lines | |
3216 | of a literal ACL, which we access via static pointers. We can destroy the | |
3217 | contents because this is called only once (the compiled ACL is remembered). | |
3218 | ||
3219 | This code is intended to treat the data in the same way as lines in the main | |
3220 | Exim configuration file. That is: | |
3221 | ||
3222 | . Leading spaces are ignored. | |
3223 | ||
3224 | . A \ at the end of a line is a continuation - trailing spaces after the \ | |
3225 | are permitted (this is because I don't believe in making invisible things | |
3226 | significant). Leading spaces on the continued part of a line are ignored. | |
3227 | ||
3228 | . Physical lines starting (significantly) with # are totally ignored, and | |
3229 | may appear within a sequence of backslash-continued lines. | |
3230 | ||
3231 | . Blank lines are ignored, but will end a sequence of continuations. | |
3232 | ||
3233 | Arguments: none | |
3234 | Returns: a pointer to the next line | |
3235 | */ | |
3236 | ||
3237 | ||
3238 | static uschar *acl_text; /* Current pointer in the text */ | |
3239 | static uschar *acl_text_end; /* Points one past the terminating '0' */ | |
3240 | ||
3241 | ||
3242 | static uschar * | |
3243 | acl_getline(void) | |
3244 | { | |
3245 | uschar *yield; | |
3246 | ||
3247 | /* This loop handles leading blank lines and comments. */ | |
3248 | ||
3249 | for(;;) | |
3250 | { | |
3251 | while (isspace(*acl_text)) acl_text++; /* Leading spaces/empty lines */ | |
3252 | if (*acl_text == 0) return NULL; /* No more data */ | |
3253 | yield = acl_text; /* Potential data line */ | |
3254 | ||
3255 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3256 | ||
3257 | /* If we hit the end before a newline, we have the whole logical line. If | |
3258 | it's a comment, there's no more data to be given. Otherwise, yield it. */ | |
3259 | ||
3260 | if (*acl_text == 0) return (*yield == '#')? NULL : yield; | |
3261 | ||
3262 | /* After reaching a newline, end this loop if the physical line does not | |
3263 | start with '#'. If it does, it's a comment, and the loop continues. */ | |
3264 | ||
3265 | if (*yield != '#') break; | |
3266 | } | |
3267 | ||
3268 | /* This loop handles continuations. We know we have some real data, ending in | |
3269 | newline. See if there is a continuation marker at the end (ignoring trailing | |
3270 | white space). We know that *yield is not white space, so no need to test for | |
3271 | cont > yield in the backwards scanning loop. */ | |
3272 | ||
3273 | for(;;) | |
3274 | { | |
3275 | uschar *cont; | |
3276 | for (cont = acl_text - 1; isspace(*cont); cont--); | |
3277 | ||
3278 | /* If no continuation follows, we are done. Mark the end of the line and | |
3279 | return it. */ | |
3280 | ||
3281 | if (*cont != '\\') | |
3282 | { | |
3283 | *acl_text++ = 0; | |
3284 | return yield; | |
3285 | } | |
3286 | ||
3287 | /* We have encountered a continuation. Skip over whitespace at the start of | |
3288 | the next line, and indeed the whole of the next line or lines if they are | |
3289 | comment lines. */ | |
3290 | ||
3291 | for (;;) | |
3292 | { | |
3293 | while (*(++acl_text) == ' ' || *acl_text == '\t'); | |
3294 | if (*acl_text != '#') break; | |
3295 | while (*(++acl_text) != 0 && *acl_text != '\n'); | |
3296 | } | |
3297 | ||
3298 | /* We have the start of a continuation line. Move all the rest of the data | |
3299 | to join onto the previous line, and then find its end. If the end is not a | |
3300 | newline, we are done. Otherwise loop to look for another continuation. */ | |
3301 | ||
3302 | memmove(cont, acl_text, acl_text_end - acl_text); | |
3303 | acl_text_end -= acl_text - cont; | |
3304 | acl_text = cont; | |
3305 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3306 | if (*acl_text == 0) return yield; | |
3307 | } | |
3308 | ||
3309 | /* Control does not reach here */ | |
3310 | } | |
3311 | ||
3312 | ||
3313 | ||
3314 | ||
3315 | ||
3316 | /************************************************* | |
3317 | * Check access using an ACL * | |
3318 | *************************************************/ | |
3319 | ||
3320 | /* This function is called from address_check. It may recurse via | |
3321 | acl_check_condition() - hence the use of a level to stop looping. The ACL is | |
3322 | passed as a string which is expanded. A forced failure implies no access check | |
3323 | is required. If the result is a single word, it is taken as the name of an ACL | |
3324 | which is sought in the global ACL tree. Otherwise, it is taken as literal ACL | |
3325 | text, complete with newlines, and parsed as such. In both cases, the ACL check | |
3326 | is then run. This function uses an auxiliary function for acl_read() to call | |
3327 | for reading individual lines of a literal ACL. This is acl_getline(), which | |
3328 | appears immediately above. | |
3329 | ||
3330 | Arguments: | |
3331 | where where called from | |
3332 | addr address item when called from RCPT; otherwise NULL | |
3333 | s the input string; NULL is the same as an empty ACL => DENY | |
3334 | level the nesting level | |
3335 | user_msgptr where to put a user error (for SMTP response) | |
3336 | log_msgptr where to put a logging message (not for SMTP response) | |
3337 | ||
3338 | Returns: OK access is granted | |
3339 | DISCARD access is apparently granted... | |
3340 | FAIL access is denied | |
3341 | FAIL_DROP access is denied; drop the connection | |
3342 | DEFER can't tell at the moment | |
3343 | ERROR disaster | |
3344 | */ | |
3345 | ||
3346 | static int | |
3347 | acl_check_internal(int where, address_item *addr, uschar *s, int level, | |
3348 | uschar **user_msgptr, uschar **log_msgptr) | |
3349 | { | |
3350 | int fd = -1; | |
3351 | acl_block *acl = NULL; | |
3352 | uschar *acl_name = US"inline ACL"; | |
3353 | uschar *ss; | |
3354 | ||
3355 | /* Catch configuration loops */ | |
3356 | ||
3357 | if (level > 20) | |
3358 | { | |
3359 | *log_msgptr = US"ACL nested too deep: possible loop"; | |
3360 | return ERROR; | |
3361 | } | |
3362 | ||
3363 | if (s == NULL) | |
3364 | { | |
3365 | HDEBUG(D_acl) debug_printf("ACL is NULL: implicit DENY\n"); | |
3366 | return FAIL; | |
3367 | } | |
3368 | ||
3369 | /* At top level, we expand the incoming string. At lower levels, it has already | |
3370 | been expanded as part of condition processing. */ | |
3371 | ||
3372 | if (level == 0) | |
3373 | { | |
3374 | ss = expand_string(s); | |
3375 | if (ss == NULL) | |
3376 | { | |
3377 | if (expand_string_forcedfail) return OK; | |
3378 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s, | |
3379 | expand_string_message); | |
3380 | return ERROR; | |
3381 | } | |
3382 | } | |
3383 | else ss = s; | |
3384 | ||
3385 | while (isspace(*ss))ss++; | |
3386 | ||
3387 | /* If we can't find a named ACL, the default is to parse it as an inline one. | |
3388 | (Unless it begins with a slash; non-existent files give rise to an error.) */ | |
3389 | ||
3390 | acl_text = ss; | |
3391 | ||
3392 | /* Handle the case of a string that does not contain any spaces. Look for a | |
3393 | named ACL among those read from the configuration, or a previously read file. | |
3394 | It is possible that the pointer to the ACL is NULL if the configuration | |
3395 | contains a name with no data. If not found, and the text begins with '/', | |
3396 | read an ACL from a file, and save it so it can be re-used. */ | |
3397 | ||
3398 | if (Ustrchr(ss, ' ') == NULL) | |
3399 | { | |
3400 | tree_node *t = tree_search(acl_anchor, ss); | |
3401 | if (t != NULL) | |
3402 | { | |
3403 | acl = (acl_block *)(t->data.ptr); | |
3404 | if (acl == NULL) | |
3405 | { | |
3406 | HDEBUG(D_acl) debug_printf("ACL \"%s\" is empty: implicit DENY\n", ss); | |
3407 | return FAIL; | |
3408 | } | |
3409 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
3410 | HDEBUG(D_acl) debug_printf("using ACL \"%s\"\n", ss); | |
3411 | } | |
3412 | ||
3413 | else if (*ss == '/') | |
3414 | { | |
3415 | struct stat statbuf; | |
3416 | fd = Uopen(ss, O_RDONLY, 0); | |
3417 | if (fd < 0) | |
3418 | { | |
3419 | *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss, | |
3420 | strerror(errno)); | |
3421 | return ERROR; | |
3422 | } | |
3423 | ||
3424 | if (fstat(fd, &statbuf) != 0) | |
3425 | { | |
3426 | *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss, | |
3427 | strerror(errno)); | |
3428 | return ERROR; | |
3429 | } | |
3430 | ||
3431 | acl_text = store_get(statbuf.st_size + 1); | |
3432 | acl_text_end = acl_text + statbuf.st_size + 1; | |
3433 | ||
3434 | if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size) | |
3435 | { | |
3436 | *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s", | |
3437 | ss, strerror(errno)); | |
3438 | return ERROR; | |
3439 | } | |
3440 | acl_text[statbuf.st_size] = 0; | |
f1e894f3 | 3441 | (void)close(fd); |
059ec3d9 PH |
3442 | |
3443 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
3444 | HDEBUG(D_acl) debug_printf("read ACL from file %s\n", ss); | |
3445 | } | |
3446 | } | |
3447 | ||
3448 | /* Parse an ACL that is still in text form. If it came from a file, remember it | |
3449 | in the ACL tree, having read it into the POOL_PERM store pool so that it | |
3450 | persists between multiple messages. */ | |
3451 | ||
3452 | if (acl == NULL) | |
3453 | { | |
3454 | int old_pool = store_pool; | |
3455 | if (fd >= 0) store_pool = POOL_PERM; | |
3456 | acl = acl_read(acl_getline, log_msgptr); | |
3457 | store_pool = old_pool; | |
3458 | if (acl == NULL && *log_msgptr != NULL) return ERROR; | |
3459 | if (fd >= 0) | |
3460 | { | |
3461 | tree_node *t = store_get_perm(sizeof(tree_node) + Ustrlen(ss)); | |
3462 | Ustrcpy(t->name, ss); | |
3463 | t->data.ptr = acl; | |
3464 | (void)tree_insertnode(&acl_anchor, t); | |
3465 | } | |
3466 | } | |
3467 | ||
3468 | /* Now we have an ACL to use. It's possible it may be NULL. */ | |
3469 | ||
3470 | while (acl != NULL) | |
3471 | { | |
3472 | int cond; | |
3473 | int basic_errno = 0; | |
3474 | BOOL endpass_seen = FALSE; | |
3475 | ||
3476 | *log_msgptr = *user_msgptr = NULL; | |
3477 | acl_temp_details = FALSE; | |
3478 | ||
7353285c | 3479 | if ((where == ACL_WHERE_QUIT || where == ACL_WHERE_NOTQUIT) && |
059ec3d9 PH |
3480 | acl->verb != ACL_ACCEPT && |
3481 | acl->verb != ACL_WARN) | |
3482 | { | |
7353285c | 3483 | *log_msgptr = string_sprintf("\"%s\" is not allowed in a QUIT or not-QUIT ACL", |
059ec3d9 PH |
3484 | verbs[acl->verb]); |
3485 | return ERROR; | |
3486 | } | |
3487 | ||
3488 | HDEBUG(D_acl) debug_printf("processing \"%s\"\n", verbs[acl->verb]); | |
3489 | ||
3490 | /* Clear out any search error message from a previous check before testing | |
3491 | this condition. */ | |
3492 | ||
3493 | search_error_message = NULL; | |
3494 | cond = acl_check_condition(acl->verb, acl->condition, where, addr, level, | |
3495 | &endpass_seen, user_msgptr, log_msgptr, &basic_errno); | |
3496 | ||
3497 | /* Handle special returns: DEFER causes a return except on a WARN verb; | |
3498 | ERROR always causes a return. */ | |
3499 | ||
3500 | switch (cond) | |
3501 | { | |
3502 | case DEFER: | |
3503 | HDEBUG(D_acl) debug_printf("%s: condition test deferred\n", verbs[acl->verb]); | |
3504 | if (basic_errno != ERRNO_CALLOUTDEFER) | |
3505 | { | |
3506 | if (search_error_message != NULL && *search_error_message != 0) | |
3507 | *log_msgptr = search_error_message; | |
3508 | if (smtp_return_error_details) acl_temp_details = TRUE; | |
3509 | } | |
3510 | else | |
3511 | { | |
3512 | acl_temp_details = TRUE; | |
3513 | } | |
3514 | if (acl->verb != ACL_WARN) return DEFER; | |
3515 | break; | |
3516 | ||
3517 | default: /* Paranoia */ | |
3518 | case ERROR: | |
3519 | HDEBUG(D_acl) debug_printf("%s: condition test error\n", verbs[acl->verb]); | |
3520 | return ERROR; | |
3521 | ||
3522 | case OK: | |
3523 | HDEBUG(D_acl) debug_printf("%s: condition test succeeded\n", | |
3524 | verbs[acl->verb]); | |
3525 | break; | |
3526 | ||
3527 | case FAIL: | |
3528 | HDEBUG(D_acl) debug_printf("%s: condition test failed\n", verbs[acl->verb]); | |
3529 | break; | |
3530 | ||
3531 | /* DISCARD and DROP can happen only from a nested ACL condition, and | |
3532 | DISCARD can happen only for an "accept" or "discard" verb. */ | |
3533 | ||
3534 | case DISCARD: | |
3535 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"discard\"\n", | |
3536 | verbs[acl->verb]); | |
3537 | break; | |
3538 | ||
3539 | case FAIL_DROP: | |
3540 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"drop\"\n", | |
3541 | verbs[acl->verb]); | |
3542 | break; | |
3543 | } | |
3544 | ||
3545 | /* At this point, cond for most verbs is either OK or FAIL or (as a result of | |
3546 | a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and | |
3547 | for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */ | |
3548 | ||
3549 | switch(acl->verb) | |
3550 | { | |
3551 | case ACL_ACCEPT: | |
3552 | if (cond == OK || cond == DISCARD) return cond; | |
3553 | if (endpass_seen) | |
3554 | { | |
3555 | HDEBUG(D_acl) debug_printf("accept: endpass encountered - denying access\n"); | |
3556 | return cond; | |
3557 | } | |
3558 | break; | |
3559 | ||
3560 | case ACL_DEFER: | |
3561 | if (cond == OK) | |
3562 | { | |
3563 | acl_temp_details = TRUE; | |
3564 | return DEFER; | |
3565 | } | |
3566 | break; | |
3567 | ||
3568 | case ACL_DENY: | |
3569 | if (cond == OK) return FAIL; | |
3570 | break; | |
3571 | ||
3572 | case ACL_DISCARD: | |
3573 | if (cond == OK || cond == DISCARD) return DISCARD; | |
3574 | if (endpass_seen) | |
3575 | { | |
3576 | HDEBUG(D_acl) debug_printf("discard: endpass encountered - denying access\n"); | |
3577 | return cond; | |
3578 | } | |
3579 | break; | |
3580 | ||
3581 | case ACL_DROP: | |
3582 | if (cond == OK) return FAIL_DROP; | |
3583 | break; | |
3584 | ||
3585 | case ACL_REQUIRE: | |
3586 | if (cond != OK) return cond; | |
3587 | break; | |
3588 | ||
3589 | case ACL_WARN: | |
3590 | if (cond == OK) | |
3591 | acl_warn(where, *user_msgptr, *log_msgptr); | |
49826d12 | 3592 | else if (cond == DEFER && (log_extra_selector & LX_acl_warn_skipped) != 0) |
9c7a242c PH |
3593 | log_write(0, LOG_MAIN, "%s Warning: ACL \"warn\" statement skipped: " |
3594 | "condition test deferred%s%s", host_and_ident(TRUE), | |
3595 | (*log_msgptr == NULL)? US"" : US": ", | |
3596 | (*log_msgptr == NULL)? US"" : *log_msgptr); | |
059ec3d9 PH |
3597 | *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */ |
3598 | break; | |
3599 | ||
3600 | default: | |
3601 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d", | |
3602 | acl->verb); | |
3603 | break; | |
3604 | } | |
3605 | ||
3606 | /* Pass to the next ACL item */ | |
3607 | ||
3608 | acl = acl->next; | |
3609 | } | |
3610 | ||
3611 | /* We have reached the end of the ACL. This is an implicit DENY. */ | |
3612 | ||
3613 | HDEBUG(D_acl) debug_printf("end of %s: implicit DENY\n", acl_name); | |
3614 | return FAIL; | |
3615 | } | |
3616 | ||
3617 | ||
3618 | /************************************************* | |
3619 | * Check access using an ACL * | |
3620 | *************************************************/ | |
3621 | ||
3622 | /* This is the external interface for ACL checks. It sets up an address and the | |
3623 | expansions for $domain and $local_part when called after RCPT, then calls | |
3624 | acl_check_internal() to do the actual work. | |
3625 | ||
3626 | Arguments: | |
3627 | where ACL_WHERE_xxxx indicating where called from | |
64ffc24f | 3628 | recipient RCPT address for RCPT check, else NULL |
059ec3d9 PH |
3629 | s the input string; NULL is the same as an empty ACL => DENY |
3630 | user_msgptr where to put a user error (for SMTP response) | |
3631 | log_msgptr where to put a logging message (not for SMTP response) | |
3632 | ||
3633 | Returns: OK access is granted by an ACCEPT verb | |
3634 | DISCARD access is granted by a DISCARD verb | |
3635 | FAIL access is denied | |
3636 | FAIL_DROP access is denied; drop the connection | |
3637 | DEFER can't tell at the moment | |
3638 | ERROR disaster | |
3639 | */ | |
3640 | ||
3641 | int | |
64ffc24f | 3642 | acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr, |
059ec3d9 PH |
3643 | uschar **log_msgptr) |
3644 | { | |
3645 | int rc; | |
3646 | address_item adb; | |
64ffc24f | 3647 | address_item *addr = NULL; |
059ec3d9 PH |
3648 | |
3649 | *user_msgptr = *log_msgptr = NULL; | |
3650 | sender_verified_failed = NULL; | |
fe0dab11 | 3651 | ratelimiters_cmd = NULL; |
6ea85e9a | 3652 | log_reject_target = LOG_MAIN|LOG_REJECT; |
059ec3d9 PH |
3653 | |
3654 | if (where == ACL_WHERE_RCPT) | |
3655 | { | |
3656 | adb = address_defaults; | |
3657 | addr = &adb; | |
64ffc24f | 3658 | addr->address = recipient; |
059ec3d9 PH |
3659 | if (deliver_split_address(addr) == DEFER) |
3660 | { | |
3661 | *log_msgptr = US"defer in percent_hack_domains check"; | |
3662 | return DEFER; | |
3663 | } | |
3664 | deliver_domain = addr->domain; | |
3665 | deliver_localpart = addr->local_part; | |
3666 | } | |
059ec3d9 PH |
3667 | |
3668 | rc = acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr); | |
3669 | ||
64ffc24f PH |
3670 | deliver_domain = deliver_localpart = deliver_address_data = |
3671 | sender_address_data = NULL; | |
059ec3d9 PH |
3672 | |
3673 | /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA | |
3674 | ACL, which is really in the middle of an SMTP command. */ | |
3675 | ||
3676 | if (rc == DISCARD) | |
3677 | { | |
3678 | if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA) | |
3679 | { | |
3680 | log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s " | |
3681 | "ACL", acl_wherenames[where]); | |
3682 | return ERROR; | |
3683 | } | |
3684 | return DISCARD; | |
3685 | } | |
3686 | ||
3687 | /* A DROP response is not permitted from MAILAUTH */ | |
3688 | ||
3689 | if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH) | |
3690 | { | |
3691 | log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s " | |
3692 | "ACL", acl_wherenames[where]); | |
3693 | return ERROR; | |
3694 | } | |
3695 | ||
4e88a19f PH |
3696 | /* Before giving a response, take a look at the length of any user message, and |
3697 | split it up into multiple lines if possible. */ | |
059ec3d9 | 3698 | |
e28326d8 PH |
3699 | *user_msgptr = string_split_message(*user_msgptr); |
3700 | if (fake_response != OK) | |
3701 | fake_response_text = string_split_message(fake_response_text); | |
059ec3d9 PH |
3702 | |
3703 | return rc; | |
3704 | } | |
3705 | ||
38a0a95f PH |
3706 | |
3707 | ||
3708 | /************************************************* | |
3709 | * Create ACL variable * | |
3710 | *************************************************/ | |
3711 | ||
3712 | /* Create an ACL variable or reuse an existing one. ACL variables are in a | |
3713 | binary tree (see tree.c) with acl_var_c and acl_var_m as root nodes. | |
3714 | ||
3715 | Argument: | |
3716 | name pointer to the variable's name, starting with c or m | |
3717 | ||
3718 | Returns the pointer to variable's tree node | |
3719 | */ | |
3720 | ||
3721 | tree_node * | |
3722 | acl_var_create(uschar *name) | |
3723 | { | |
3724 | tree_node *node, **root; | |
3725 | root = (name[0] == 'c')? &acl_var_c : &acl_var_m; | |
3726 | node = tree_search(*root, name); | |
3727 | if (node == NULL) | |
3728 | { | |
3729 | node = store_get(sizeof(tree_node) + Ustrlen(name)); | |
3730 | Ustrcpy(node->name, name); | |
3731 | (void)tree_insertnode(root, node); | |
3732 | } | |
3733 | node->data.ptr = NULL; | |
3734 | return node; | |
3735 | } | |
3736 | ||
3737 | ||
3738 | ||
3739 | /************************************************* | |
3740 | * Write an ACL variable in spool format * | |
3741 | *************************************************/ | |
3742 | ||
3743 | /* This function is used as a callback for tree_walk when writing variables to | |
3744 | the spool file. To retain spool file compatibility, what is written is -aclc or | |
3745 | -aclm followed by the rest of the name and the data length, space separated, | |
3746 | then the value itself, starting on a new line, and terminated by an additional | |
3747 | newline. When we had only numbered ACL variables, the first line might look | |
3748 | like this: "-aclc 5 20". Now it might be "-aclc foo 20" for the variable called | |
3749 | acl_cfoo. | |
3750 | ||
3751 | Arguments: | |
3752 | name of the variable | |
3753 | value of the variable | |
3754 | ctx FILE pointer (as a void pointer) | |
3755 | ||
3756 | Returns: nothing | |
3757 | */ | |
3758 | ||
3759 | void | |
3760 | acl_var_write(uschar *name, uschar *value, void *ctx) | |
3761 | { | |
3762 | FILE *f = (FILE *)ctx; | |
3763 | fprintf(f, "-acl%c %s %d\n%s\n", name[0], name+1, Ustrlen(value), value); | |
3764 | } | |
3765 | ||
059ec3d9 | 3766 | /* End of acl.c */ |