Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
3386088d | 5 | /* Copyright (c) University of Cambridge 1995 - 2015 */ |
059ec3d9 PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | /* Code for handling Access Control Lists (ACLs) */ | |
9 | ||
10 | #include "exim.h" | |
11 | ||
12 | ||
13 | /* Default callout timeout */ | |
14 | ||
15 | #define CALLOUT_TIMEOUT_DEFAULT 30 | |
16 | ||
17 | /* ACL verb codes - keep in step with the table of verbs that follows */ | |
18 | ||
19 | enum { ACL_ACCEPT, ACL_DEFER, ACL_DENY, ACL_DISCARD, ACL_DROP, ACL_REQUIRE, | |
20 | ACL_WARN }; | |
21 | ||
22 | /* ACL verbs */ | |
23 | ||
f9d04f08 JH |
24 | static uschar *verbs[] = { |
25 | US"accept", | |
26 | US"defer", | |
27 | US"deny", | |
28 | US"discard", | |
29 | US"drop", | |
30 | US"require", | |
059ec3d9 PH |
31 | US"warn" }; |
32 | ||
4e88a19f PH |
33 | /* For each verb, the conditions for which "message" or "log_message" are used |
34 | are held as a bitmap. This is to avoid expanding the strings unnecessarily. For | |
35 | "accept", the FAIL case is used only after "endpass", but that is selected in | |
36 | the code. */ | |
37 | ||
38 | static int msgcond[] = { | |
39 | (1<<OK) | (1<<FAIL) | (1<<FAIL_DROP), /* accept */ | |
40 | (1<<OK), /* defer */ | |
41 | (1<<OK), /* deny */ | |
42 | (1<<OK) | (1<<FAIL) | (1<<FAIL_DROP), /* discard */ | |
43 | (1<<OK), /* drop */ | |
44 | (1<<FAIL) | (1<<FAIL_DROP), /* require */ | |
45 | (1<<OK) /* warn */ | |
46 | }; | |
059ec3d9 PH |
47 | |
48 | /* ACL condition and modifier codes - keep in step with the table that | |
71fafd95 PH |
49 | follows, and the cond_expand_at_top and uschar cond_modifiers tables lower |
50 | down. */ | |
059ec3d9 | 51 | |
71fafd95 PH |
52 | enum { ACLC_ACL, |
53 | ACLC_ADD_HEADER, | |
54 | ACLC_AUTHENTICATED, | |
8523533c TK |
55 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
56 | ACLC_BMI_OPTIN, | |
57 | #endif | |
71fafd95 | 58 | ACLC_CONDITION, |
c3611384 | 59 | ACLC_CONTINUE, |
71fafd95 | 60 | ACLC_CONTROL, |
6a8f9482 TK |
61 | #ifdef EXPERIMENTAL_DCC |
62 | ACLC_DCC, | |
63 | #endif | |
8523533c TK |
64 | #ifdef WITH_CONTENT_SCAN |
65 | ACLC_DECODE, | |
66 | #endif | |
67 | ACLC_DELAY, | |
68 | #ifdef WITH_OLD_DEMIME | |
69 | ACLC_DEMIME, | |
fb2274d4 | 70 | #endif |
80a47a2c TK |
71 | #ifndef DISABLE_DKIM |
72 | ACLC_DKIM_SIGNER, | |
73 | ACLC_DKIM_STATUS, | |
4840604e TL |
74 | #endif |
75 | #ifdef EXPERIMENTAL_DMARC | |
76 | ACLC_DMARC_STATUS, | |
8e669ac1 | 77 | #endif |
71fafd95 PH |
78 | ACLC_DNSLISTS, |
79 | ACLC_DOMAINS, | |
80 | ACLC_ENCRYPTED, | |
81 | ACLC_ENDPASS, | |
82 | ACLC_HOSTS, | |
83 | ACLC_LOCAL_PARTS, | |
84 | ACLC_LOG_MESSAGE, | |
6ea85e9a | 85 | ACLC_LOG_REJECT_TARGET, |
71fafd95 | 86 | ACLC_LOGWRITE, |
8523533c TK |
87 | #ifdef WITH_CONTENT_SCAN |
88 | ACLC_MALWARE, | |
89 | #endif | |
90 | ACLC_MESSAGE, | |
91 | #ifdef WITH_CONTENT_SCAN | |
92 | ACLC_MIME_REGEX, | |
93 | #endif | |
870f6ba8 | 94 | ACLC_RATELIMIT, |
8523533c TK |
95 | ACLC_RECIPIENTS, |
96 | #ifdef WITH_CONTENT_SCAN | |
97 | ACLC_REGEX, | |
98 | #endif | |
e7568d51 | 99 | ACLC_REMOVE_HEADER, |
71fafd95 PH |
100 | ACLC_SENDER_DOMAINS, |
101 | ACLC_SENDERS, | |
102 | ACLC_SET, | |
8523533c | 103 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 104 | ACLC_SPAM, |
8523533c TK |
105 | #endif |
106 | #ifdef EXPERIMENTAL_SPF | |
107 | ACLC_SPF, | |
65a7d8c3 | 108 | ACLC_SPF_GUESS, |
8523533c | 109 | #endif |
b0019c78 | 110 | ACLC_UDPSEND, |
8523533c | 111 | ACLC_VERIFY }; |
059ec3d9 | 112 | |
c3611384 PH |
113 | /* ACL conditions/modifiers: "delay", "control", "continue", "endpass", |
114 | "message", "log_message", "log_reject_target", "logwrite", and "set" are | |
115 | modifiers that look like conditions but always return TRUE. They are used for | |
116 | their side effects. */ | |
059ec3d9 | 117 | |
9a26b6b2 PH |
118 | static uschar *conditions[] = { |
119 | US"acl", | |
71fafd95 | 120 | US"add_header", |
9a26b6b2 | 121 | US"authenticated", |
8523533c TK |
122 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
123 | US"bmi_optin", | |
124 | #endif | |
125 | US"condition", | |
c3611384 | 126 | US"continue", |
8e669ac1 | 127 | US"control", |
6a8f9482 TK |
128 | #ifdef EXPERIMENTAL_DCC |
129 | US"dcc", | |
130 | #endif | |
8523533c TK |
131 | #ifdef WITH_CONTENT_SCAN |
132 | US"decode", | |
133 | #endif | |
134 | US"delay", | |
135 | #ifdef WITH_OLD_DEMIME | |
136 | US"demime", | |
fb2274d4 | 137 | #endif |
80a47a2c TK |
138 | #ifndef DISABLE_DKIM |
139 | US"dkim_signers", | |
140 | US"dkim_status", | |
4840604e TL |
141 | #endif |
142 | #ifdef EXPERIMENTAL_DMARC | |
143 | US"dmarc_status", | |
8523533c | 144 | #endif |
6ea85e9a PH |
145 | US"dnslists", |
146 | US"domains", | |
147 | US"encrypted", | |
148 | US"endpass", | |
149 | US"hosts", | |
150 | US"local_parts", | |
151 | US"log_message", | |
152 | US"log_reject_target", | |
153 | US"logwrite", | |
8523533c TK |
154 | #ifdef WITH_CONTENT_SCAN |
155 | US"malware", | |
156 | #endif | |
157 | US"message", | |
158 | #ifdef WITH_CONTENT_SCAN | |
159 | US"mime_regex", | |
160 | #endif | |
870f6ba8 | 161 | US"ratelimit", |
8523533c TK |
162 | US"recipients", |
163 | #ifdef WITH_CONTENT_SCAN | |
164 | US"regex", | |
165 | #endif | |
e7568d51 | 166 | US"remove_header", |
8523533c TK |
167 | US"sender_domains", US"senders", US"set", |
168 | #ifdef WITH_CONTENT_SCAN | |
169 | US"spam", | |
170 | #endif | |
171 | #ifdef EXPERIMENTAL_SPF | |
172 | US"spf", | |
65a7d8c3 | 173 | US"spf_guess", |
8523533c | 174 | #endif |
b0019c78 | 175 | US"udpsend", |
059ec3d9 | 176 | US"verify" }; |
8e669ac1 | 177 | |
c5fcb476 | 178 | |
9a26b6b2 PH |
179 | /* Return values from decode_control(); keep in step with the table of names |
180 | that follows! */ | |
181 | ||
182 | enum { | |
c46782ef | 183 | CONTROL_AUTH_UNADVERTISED, |
3c8b3577 | 184 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
9a26b6b2 | 185 | CONTROL_BMI_RUN, |
3c8b3577 | 186 | #endif |
ed7f7860 | 187 | CONTROL_DEBUG, |
3c8b3577 | 188 | #ifndef DISABLE_DKIM |
f7572e5a | 189 | CONTROL_DKIM_VERIFY, |
3c8b3577 JH |
190 | #endif |
191 | #ifdef EXPERIMENTAL_DMARC | |
4840604e TL |
192 | CONTROL_DMARC_VERIFY, |
193 | CONTROL_DMARC_FORENSIC, | |
3c8b3577 | 194 | #endif |
13363eba | 195 | CONTROL_DSCP, |
c46782ef PH |
196 | CONTROL_ERROR, |
197 | CONTROL_CASEFUL_LOCAL_PART, | |
198 | CONTROL_CASELOWER_LOCAL_PART, | |
e4bdf652 | 199 | CONTROL_CUTTHROUGH_DELIVERY, |
c46782ef PH |
200 | CONTROL_ENFORCE_SYNC, |
201 | CONTROL_NO_ENFORCE_SYNC, | |
202 | CONTROL_FREEZE, | |
203 | CONTROL_QUEUE_ONLY, | |
204 | CONTROL_SUBMISSION, | |
205 | CONTROL_SUPPRESS_LOCAL_FIXUPS, | |
3c8b3577 | 206 | #ifdef WITH_CONTENT_SCAN |
9a26b6b2 | 207 | CONTROL_NO_MBOX_UNSPOOL, |
3c8b3577 | 208 | #endif |
c46782ef PH |
209 | CONTROL_FAKEDEFER, |
210 | CONTROL_FAKEREJECT, | |
8c5d388a | 211 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
212 | CONTROL_UTF8_DOWNCONVERT, |
213 | #endif | |
cf8b11a5 | 214 | CONTROL_NO_MULTILINE, |
047bdd8c | 215 | CONTROL_NO_PIPELINING, |
4c590bd1 PH |
216 | CONTROL_NO_DELAY_FLUSH, |
217 | CONTROL_NO_CALLOUT_FLUSH | |
c46782ef | 218 | }; |
9a26b6b2 | 219 | |
8800895a PH |
220 | /* ACL control names; keep in step with the table above! This list is used for |
221 | turning ids into names. The actual list of recognized names is in the variable | |
222 | control_def controls_list[] below. The fact that there are two lists is a mess | |
223 | and should be tidied up. */ | |
9a26b6b2 PH |
224 | |
225 | static uschar *controls[] = { | |
c46782ef | 226 | US"allow_auth_unadvertised", |
3c8b3577 | 227 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
9a26b6b2 | 228 | US"bmi_run", |
3c8b3577 | 229 | #endif |
ed7f7860 | 230 | US"debug", |
3c8b3577 | 231 | #ifndef DISABLE_DKIM |
80a47a2c | 232 | US"dkim_disable_verify", |
3c8b3577 JH |
233 | #endif |
234 | #ifdef EXPERIMENTAL_DMARC | |
4840604e TL |
235 | US"dmarc_disable_verify", |
236 | US"dmarc_enable_forensic", | |
3c8b3577 | 237 | #endif |
13363eba | 238 | US"dscp", |
c46782ef PH |
239 | US"error", |
240 | US"caseful_local_part", | |
241 | US"caselower_local_part", | |
e4bdf652 | 242 | US"cutthrough_delivery", |
c46782ef PH |
243 | US"enforce_sync", |
244 | US"no_enforce_sync", | |
245 | US"freeze", | |
246 | US"queue_only", | |
247 | US"submission", | |
248 | US"suppress_local_fixups", | |
3c8b3577 | 249 | #ifdef WITH_CONTENT_SCAN |
9a26b6b2 | 250 | US"no_mbox_unspool", |
3c8b3577 | 251 | #endif |
cf8b11a5 PH |
252 | US"fakedefer", |
253 | US"fakereject", | |
8c5d388a | 254 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
255 | US"utf8_downconvert", |
256 | #endif | |
aa6dc513 | 257 | US"no_multiline_responses", |
cf8b11a5 | 258 | US"no_pipelining", |
4c590bd1 PH |
259 | US"no_delay_flush", |
260 | US"no_callout_flush" | |
c46782ef | 261 | }; |
059ec3d9 | 262 | |
047bdd8c | 263 | /* Flags to indicate for which conditions/modifiers a string expansion is done |
059ec3d9 PH |
264 | at the outer level. In the other cases, expansion already occurs in the |
265 | checking functions. */ | |
266 | ||
267 | static uschar cond_expand_at_top[] = { | |
7421ecab | 268 | FALSE, /* acl */ |
3e536984 | 269 | TRUE, /* add_header */ |
059ec3d9 | 270 | FALSE, /* authenticated */ |
8523533c TK |
271 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
272 | TRUE, /* bmi_optin */ | |
8e669ac1 | 273 | #endif |
059ec3d9 | 274 | TRUE, /* condition */ |
c3611384 | 275 | TRUE, /* continue */ |
059ec3d9 | 276 | TRUE, /* control */ |
6a8f9482 TK |
277 | #ifdef EXPERIMENTAL_DCC |
278 | TRUE, /* dcc */ | |
279 | #endif | |
8523533c TK |
280 | #ifdef WITH_CONTENT_SCAN |
281 | TRUE, /* decode */ | |
282 | #endif | |
059ec3d9 | 283 | TRUE, /* delay */ |
8523533c TK |
284 | #ifdef WITH_OLD_DEMIME |
285 | TRUE, /* demime */ | |
fb2274d4 | 286 | #endif |
80a47a2c TK |
287 | #ifndef DISABLE_DKIM |
288 | TRUE, /* dkim_signers */ | |
289 | TRUE, /* dkim_status */ | |
4840604e TL |
290 | #endif |
291 | #ifdef EXPERIMENTAL_DMARC | |
292 | TRUE, /* dmarc_status */ | |
8523533c | 293 | #endif |
059ec3d9 PH |
294 | TRUE, /* dnslists */ |
295 | FALSE, /* domains */ | |
296 | FALSE, /* encrypted */ | |
297 | TRUE, /* endpass */ | |
298 | FALSE, /* hosts */ | |
299 | FALSE, /* local_parts */ | |
300 | TRUE, /* log_message */ | |
6ea85e9a | 301 | TRUE, /* log_reject_target */ |
059ec3d9 | 302 | TRUE, /* logwrite */ |
8523533c TK |
303 | #ifdef WITH_CONTENT_SCAN |
304 | TRUE, /* malware */ | |
305 | #endif | |
059ec3d9 | 306 | TRUE, /* message */ |
8523533c TK |
307 | #ifdef WITH_CONTENT_SCAN |
308 | TRUE, /* mime_regex */ | |
309 | #endif | |
870f6ba8 | 310 | TRUE, /* ratelimit */ |
059ec3d9 | 311 | FALSE, /* recipients */ |
8523533c TK |
312 | #ifdef WITH_CONTENT_SCAN |
313 | TRUE, /* regex */ | |
314 | #endif | |
e7568d51 | 315 | TRUE, /* remove_header */ |
059ec3d9 PH |
316 | FALSE, /* sender_domains */ |
317 | FALSE, /* senders */ | |
318 | TRUE, /* set */ | |
8523533c TK |
319 | #ifdef WITH_CONTENT_SCAN |
320 | TRUE, /* spam */ | |
321 | #endif | |
322 | #ifdef EXPERIMENTAL_SPF | |
323 | TRUE, /* spf */ | |
65a7d8c3 | 324 | TRUE, /* spf_guess */ |
8523533c | 325 | #endif |
b0019c78 | 326 | TRUE, /* udpsend */ |
059ec3d9 PH |
327 | TRUE /* verify */ |
328 | }; | |
329 | ||
330 | /* Flags to identify the modifiers */ | |
331 | ||
332 | static uschar cond_modifiers[] = { | |
333 | FALSE, /* acl */ | |
3e536984 | 334 | TRUE, /* add_header */ |
059ec3d9 | 335 | FALSE, /* authenticated */ |
8523533c TK |
336 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
337 | TRUE, /* bmi_optin */ | |
8e669ac1 | 338 | #endif |
059ec3d9 | 339 | FALSE, /* condition */ |
c3611384 | 340 | TRUE, /* continue */ |
059ec3d9 | 341 | TRUE, /* control */ |
6a8f9482 TK |
342 | #ifdef EXPERIMENTAL_DCC |
343 | FALSE, /* dcc */ | |
344 | #endif | |
8523533c TK |
345 | #ifdef WITH_CONTENT_SCAN |
346 | FALSE, /* decode */ | |
347 | #endif | |
059ec3d9 | 348 | TRUE, /* delay */ |
8523533c TK |
349 | #ifdef WITH_OLD_DEMIME |
350 | FALSE, /* demime */ | |
fb2274d4 | 351 | #endif |
80a47a2c TK |
352 | #ifndef DISABLE_DKIM |
353 | FALSE, /* dkim_signers */ | |
354 | FALSE, /* dkim_status */ | |
4840604e TL |
355 | #endif |
356 | #ifdef EXPERIMENTAL_DMARC | |
357 | FALSE, /* dmarc_status */ | |
8523533c | 358 | #endif |
059ec3d9 PH |
359 | FALSE, /* dnslists */ |
360 | FALSE, /* domains */ | |
361 | FALSE, /* encrypted */ | |
362 | TRUE, /* endpass */ | |
363 | FALSE, /* hosts */ | |
364 | FALSE, /* local_parts */ | |
365 | TRUE, /* log_message */ | |
6ea85e9a | 366 | TRUE, /* log_reject_target */ |
8523533c TK |
367 | TRUE, /* logwrite */ |
368 | #ifdef WITH_CONTENT_SCAN | |
369 | FALSE, /* malware */ | |
370 | #endif | |
059ec3d9 | 371 | TRUE, /* message */ |
8523533c TK |
372 | #ifdef WITH_CONTENT_SCAN |
373 | FALSE, /* mime_regex */ | |
374 | #endif | |
870f6ba8 | 375 | FALSE, /* ratelimit */ |
059ec3d9 | 376 | FALSE, /* recipients */ |
8523533c TK |
377 | #ifdef WITH_CONTENT_SCAN |
378 | FALSE, /* regex */ | |
379 | #endif | |
e7568d51 | 380 | TRUE, /* remove_header */ |
059ec3d9 PH |
381 | FALSE, /* sender_domains */ |
382 | FALSE, /* senders */ | |
383 | TRUE, /* set */ | |
8523533c TK |
384 | #ifdef WITH_CONTENT_SCAN |
385 | FALSE, /* spam */ | |
386 | #endif | |
387 | #ifdef EXPERIMENTAL_SPF | |
388 | FALSE, /* spf */ | |
65a7d8c3 | 389 | FALSE, /* spf_guess */ |
8523533c | 390 | #endif |
b0019c78 | 391 | TRUE, /* udpsend */ |
059ec3d9 PH |
392 | FALSE /* verify */ |
393 | }; | |
394 | ||
c3611384 | 395 | /* Bit map vector of which conditions and modifiers are not allowed at certain |
8f128379 PH |
396 | times. For each condition and modifier, there's a bitmap of dis-allowed times. |
397 | For some, it is easier to specify the negation of a small number of allowed | |
398 | times. */ | |
059ec3d9 PH |
399 | |
400 | static unsigned int cond_forbids[] = { | |
401 | 0, /* acl */ | |
8e669ac1 | 402 | |
71fafd95 | 403 | (unsigned int) |
45b91596 | 404 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* add_header */ |
71fafd95 | 405 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
8ccd00b1 | 406 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
407 | (1<<ACL_WHERE_PRDR)| |
408 | #endif | |
45b91596 | 409 | (1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)| |
67caae1f | 410 | (1<<ACL_WHERE_DKIM)| |
45b91596 | 411 | (1<<ACL_WHERE_NOTSMTP_START)), |
71fafd95 | 412 | |
45b91596 PH |
413 | (1<<ACL_WHERE_NOTSMTP)| /* authenticated */ |
414 | (1<<ACL_WHERE_NOTSMTP_START)| | |
415 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO), | |
8e669ac1 | 416 | |
71fafd95 | 417 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
3864bb8e | 418 | (1<<ACL_WHERE_AUTH)| /* bmi_optin */ |
8523533c TK |
419 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
420 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_MIME)| | |
8ccd00b1 | 421 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
422 | (1<<ACL_WHERE_PRDR)| |
423 | #endif | |
8e669ac1 | 424 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
8523533c TK |
425 | (1<<ACL_WHERE_MAILAUTH)| |
426 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 PH |
427 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_PREDATA)| |
428 | (1<<ACL_WHERE_NOTSMTP_START), | |
71fafd95 | 429 | #endif |
8e669ac1 | 430 | |
059ec3d9 | 431 | 0, /* condition */ |
8e669ac1 | 432 | |
c3611384 PH |
433 | 0, /* continue */ |
434 | ||
059ec3d9 | 435 | /* Certain types of control are always allowed, so we let it through |
2f079f46 | 436 | always and check in the control processing itself. */ |
8e669ac1 | 437 | |
059ec3d9 | 438 | 0, /* control */ |
8e669ac1 | 439 | |
6a8f9482 TK |
440 | #ifdef EXPERIMENTAL_DCC |
441 | (unsigned int) | |
fd98a5c6 | 442 | ~((1<<ACL_WHERE_DATA)| /* dcc */ |
8ccd00b1 | 443 | #ifndef DISABLE_PRDR |
fd98a5c6 | 444 | (1<<ACL_WHERE_PRDR)| |
8ccd00b1 | 445 | #endif |
fd98a5c6 | 446 | (1<<ACL_WHERE_NOTSMTP)), |
6a8f9482 TK |
447 | #endif |
448 | ||
71fafd95 | 449 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
450 | (unsigned int) |
451 | ~(1<<ACL_WHERE_MIME), /* decode */ | |
71fafd95 | 452 | #endif |
8523533c | 453 | |
8f128379 | 454 | (1<<ACL_WHERE_NOTQUIT), /* delay */ |
8e669ac1 | 455 | |
71fafd95 | 456 | #ifdef WITH_OLD_DEMIME |
2f079f46 | 457 | (unsigned int) |
fd98a5c6 | 458 | ~((1<<ACL_WHERE_DATA)| /* demime */ |
8ccd00b1 | 459 | #ifndef DISABLE_PRDR |
fd98a5c6 | 460 | (1<<ACL_WHERE_PRDR)| |
8ccd00b1 | 461 | #endif |
fd98a5c6 | 462 | (1<<ACL_WHERE_NOTSMTP)), |
71fafd95 | 463 | #endif |
8e669ac1 | 464 | |
80a47a2c TK |
465 | #ifndef DISABLE_DKIM |
466 | (unsigned int) | |
467 | ~(1<<ACL_WHERE_DKIM), /* dkim_signers */ | |
84330b7b | 468 | |
80a47a2c TK |
469 | (unsigned int) |
470 | ~(1<<ACL_WHERE_DKIM), /* dkim_status */ | |
71fafd95 | 471 | #endif |
fb2274d4 | 472 | |
4840604e TL |
473 | #ifdef EXPERIMENTAL_DMARC |
474 | (unsigned int) | |
475 | ~(1<<ACL_WHERE_DATA), /* dmarc_status */ | |
476 | #endif | |
477 | ||
379ba7d0 JH |
478 | /* Explicit key lookups can be made in non-smtp ACLs so pass |
479 | always and check in the verify processing itself. */ | |
480 | ||
481 | 0, /* dnslists */ | |
059ec3d9 | 482 | |
2f079f46 | 483 | (unsigned int) |
fd98a5c6 | 484 | ~((1<<ACL_WHERE_RCPT) /* domains */ |
8ccd00b1 | 485 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
486 | |(1<<ACL_WHERE_PRDR) |
487 | #endif | |
488 | ), | |
059ec3d9 | 489 | |
45b91596 PH |
490 | (1<<ACL_WHERE_NOTSMTP)| /* encrypted */ |
491 | (1<<ACL_WHERE_CONNECT)| | |
492 | (1<<ACL_WHERE_NOTSMTP_START)| | |
059ec3d9 | 493 | (1<<ACL_WHERE_HELO), |
8e669ac1 | 494 | |
059ec3d9 | 495 | 0, /* endpass */ |
8e669ac1 | 496 | |
45b91596 PH |
497 | (1<<ACL_WHERE_NOTSMTP)| /* hosts */ |
498 | (1<<ACL_WHERE_NOTSMTP_START), | |
059ec3d9 | 499 | |
2f079f46 | 500 | (unsigned int) |
fd98a5c6 | 501 | ~((1<<ACL_WHERE_RCPT) /* local_parts */ |
2e6afa4f | 502 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
503 | |(1<<ACL_WHERE_PRDR) |
504 | #endif | |
505 | ), | |
059ec3d9 PH |
506 | |
507 | 0, /* log_message */ | |
8e669ac1 | 508 | |
6ea85e9a PH |
509 | 0, /* log_reject_target */ |
510 | ||
059ec3d9 | 511 | 0, /* logwrite */ |
8e669ac1 | 512 | |
71fafd95 | 513 | #ifdef WITH_CONTENT_SCAN |
2f079f46 | 514 | (unsigned int) |
fd98a5c6 | 515 | ~((1<<ACL_WHERE_DATA)| /* malware */ |
8ccd00b1 | 516 | #ifndef DISABLE_PRDR |
fd98a5c6 | 517 | (1<<ACL_WHERE_PRDR)| |
8ccd00b1 | 518 | #endif |
fd98a5c6 | 519 | (1<<ACL_WHERE_NOTSMTP)), |
71fafd95 | 520 | #endif |
8523533c | 521 | |
059ec3d9 PH |
522 | 0, /* message */ |
523 | ||
71fafd95 | 524 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
525 | (unsigned int) |
526 | ~(1<<ACL_WHERE_MIME), /* mime_regex */ | |
71fafd95 | 527 | #endif |
8523533c | 528 | |
870f6ba8 TF |
529 | 0, /* ratelimit */ |
530 | ||
2f079f46 PH |
531 | (unsigned int) |
532 | ~(1<<ACL_WHERE_RCPT), /* recipients */ | |
059ec3d9 | 533 | |
71fafd95 | 534 | #ifdef WITH_CONTENT_SCAN |
2f079f46 | 535 | (unsigned int) |
fd98a5c6 | 536 | ~((1<<ACL_WHERE_DATA)| /* regex */ |
8ccd00b1 | 537 | #ifndef DISABLE_PRDR |
fd98a5c6 | 538 | (1<<ACL_WHERE_PRDR)| |
8ccd00b1 | 539 | #endif |
fd98a5c6 | 540 | (1<<ACL_WHERE_NOTSMTP)| |
2f079f46 | 541 | (1<<ACL_WHERE_MIME)), |
71fafd95 | 542 | #endif |
8523533c | 543 | |
e7568d51 TL |
544 | (unsigned int) |
545 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* remove_header */ | |
546 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
8ccd00b1 | 547 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
548 | (1<<ACL_WHERE_PRDR)| |
549 | #endif | |
e7568d51 TL |
550 | (1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)| |
551 | (1<<ACL_WHERE_NOTSMTP_START)), | |
552 | ||
059ec3d9 PH |
553 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* sender_domains */ |
554 | (1<<ACL_WHERE_HELO)| | |
555 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
556 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
557 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
558 | ||
559 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* senders */ | |
560 | (1<<ACL_WHERE_HELO)| | |
561 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
562 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
563 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
564 | ||
565 | 0, /* set */ | |
566 | ||
71fafd95 | 567 | #ifdef WITH_CONTENT_SCAN |
2f079f46 | 568 | (unsigned int) |
fd98a5c6 | 569 | ~((1<<ACL_WHERE_DATA)| /* spam */ |
8ccd00b1 | 570 | #ifndef DISABLE_PRDR |
fd98a5c6 | 571 | (1<<ACL_WHERE_PRDR)| |
8ccd00b1 | 572 | #endif |
fd98a5c6 | 573 | (1<<ACL_WHERE_NOTSMTP)), |
71fafd95 | 574 | #endif |
8523533c | 575 | |
71fafd95 | 576 | #ifdef EXPERIMENTAL_SPF |
8523533c TK |
577 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf */ |
578 | (1<<ACL_WHERE_HELO)| | |
579 | (1<<ACL_WHERE_MAILAUTH)| | |
580 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
45b91596 PH |
581 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY)| |
582 | (1<<ACL_WHERE_NOTSMTP)| | |
583 | (1<<ACL_WHERE_NOTSMTP_START), | |
65a7d8c3 NM |
584 | |
585 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf_guess */ | |
586 | (1<<ACL_WHERE_HELO)| | |
587 | (1<<ACL_WHERE_MAILAUTH)| | |
588 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
589 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY)| | |
590 | (1<<ACL_WHERE_NOTSMTP)| | |
591 | (1<<ACL_WHERE_NOTSMTP_START), | |
71fafd95 | 592 | #endif |
8523533c | 593 | |
b0019c78 TF |
594 | 0, /* udpsend */ |
595 | ||
059ec3d9 PH |
596 | /* Certain types of verify are always allowed, so we let it through |
597 | always and check in the verify function itself */ | |
598 | ||
599 | 0 /* verify */ | |
059ec3d9 PH |
600 | }; |
601 | ||
602 | ||
c5fcb476 PH |
603 | /* Bit map vector of which controls are not allowed at certain times. For |
604 | each control, there's a bitmap of dis-allowed times. For some, it is easier to | |
605 | specify the negation of a small number of allowed times. */ | |
606 | ||
607 | static unsigned int control_forbids[] = { | |
c46782ef PH |
608 | (unsigned int) |
609 | ~((1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)), /* allow_auth_unadvertised */ | |
610 | ||
3c8b3577 | 611 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
8523533c | 612 | 0, /* bmi_run */ |
3c8b3577 | 613 | #endif |
c46782ef | 614 | |
ed7f7860 PP |
615 | 0, /* debug */ |
616 | ||
3c8b3577 | 617 | #ifndef DISABLE_DKIM |
80a47a2c | 618 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dkim_disable_verify */ |
3c8b3577 | 619 | # ifndef DISABLE_PRDR |
fd98a5c6 | 620 | (1<<ACL_WHERE_PRDR)| |
3c8b3577 | 621 | # endif |
f7572e5a | 622 | (1<<ACL_WHERE_NOTSMTP_START), |
3c8b3577 | 623 | #endif |
f7572e5a | 624 | |
3c8b3577 | 625 | #ifdef EXPERIMENTAL_DMARC |
4840604e TL |
626 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dmarc_disable_verify */ |
627 | (1<<ACL_WHERE_NOTSMTP_START), | |
628 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dmarc_enable_forensic */ | |
629 | (1<<ACL_WHERE_NOTSMTP_START), | |
3c8b3577 | 630 | #endif |
4840604e | 631 | |
13363eba PP |
632 | (1<<ACL_WHERE_NOTSMTP)| |
633 | (1<<ACL_WHERE_NOTSMTP_START)| | |
634 | (1<<ACL_WHERE_NOTQUIT), /* dscp */ | |
635 | ||
c5fcb476 | 636 | 0, /* error */ |
8e669ac1 PH |
637 | |
638 | (unsigned int) | |
c5fcb476 | 639 | ~(1<<ACL_WHERE_RCPT), /* caseful_local_part */ |
8e669ac1 PH |
640 | |
641 | (unsigned int) | |
c5fcb476 | 642 | ~(1<<ACL_WHERE_RCPT), /* caselower_local_part */ |
8e669ac1 | 643 | |
e4bdf652 JH |
644 | (unsigned int) |
645 | 0, /* cutthrough_delivery */ | |
646 | ||
45b91596 PH |
647 | (1<<ACL_WHERE_NOTSMTP)| /* enforce_sync */ |
648 | (1<<ACL_WHERE_NOTSMTP_START), | |
8e669ac1 | 649 | |
45b91596 PH |
650 | (1<<ACL_WHERE_NOTSMTP)| /* no_enforce_sync */ |
651 | (1<<ACL_WHERE_NOTSMTP_START), | |
8e669ac1 PH |
652 | |
653 | (unsigned int) | |
c5fcb476 PH |
654 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* freeze */ |
655 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
fd98a5c6 | 656 | // (1<<ACL_WHERE_PRDR)| /* Not allow one user to freeze for all */ |
e715ad22 | 657 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
658 | |
659 | (unsigned int) | |
c5fcb476 PH |
660 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* queue_only */ |
661 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
fd98a5c6 | 662 | // (1<<ACL_WHERE_PRDR)| /* Not allow one user to freeze for all */ |
e715ad22 | 663 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
664 | |
665 | (unsigned int) | |
c5fcb476 | 666 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* submission */ |
8e669ac1 | 667 | (1<<ACL_WHERE_PREDATA)), |
8523533c | 668 | |
8800895a PH |
669 | (unsigned int) |
670 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* suppress_local_fixups */ | |
45b91596 PH |
671 | (1<<ACL_WHERE_PREDATA)| |
672 | (1<<ACL_WHERE_NOTSMTP_START)), | |
8800895a | 673 | |
3c8b3577 | 674 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 675 | (unsigned int) |
14d57970 | 676 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* no_mbox_unspool */ |
e715ad22 | 677 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
fd98a5c6 | 678 | // (1<<ACL_WHERE_PRDR)| /* Not allow one user to freeze for all */ |
e715ad22 | 679 | (1<<ACL_WHERE_MIME)), |
3c8b3577 | 680 | #endif |
a6c4ab60 | 681 | |
29aba418 TF |
682 | (unsigned int) |
683 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakedefer */ | |
684 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
3c8b3577 | 685 | #ifndef DISABLE_PRDR |
fd98a5c6 | 686 | (1<<ACL_WHERE_PRDR)| |
3c8b3577 | 687 | #endif |
29aba418 TF |
688 | (1<<ACL_WHERE_MIME)), |
689 | ||
8e669ac1 | 690 | (unsigned int) |
a6c4ab60 | 691 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakereject */ |
e715ad22 | 692 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
3c8b3577 | 693 | #ifndef DISABLE_PRDR |
fd98a5c6 | 694 | (1<<ACL_WHERE_PRDR)| |
3c8b3577 | 695 | #endif |
e715ad22 | 696 | (1<<ACL_WHERE_MIME)), |
8523533c | 697 | |
8c5d388a | 698 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
699 | 0, /* utf8_downconvert */ |
700 | #endif | |
701 | ||
45b91596 | 702 | (1<<ACL_WHERE_NOTSMTP)| /* no_multiline */ |
cf8b11a5 PH |
703 | (1<<ACL_WHERE_NOTSMTP_START), |
704 | ||
705 | (1<<ACL_WHERE_NOTSMTP)| /* no_pipelining */ | |
047bdd8c PH |
706 | (1<<ACL_WHERE_NOTSMTP_START), |
707 | ||
708 | (1<<ACL_WHERE_NOTSMTP)| /* no_delay_flush */ | |
4c590bd1 PH |
709 | (1<<ACL_WHERE_NOTSMTP_START), |
710 | ||
711 | (1<<ACL_WHERE_NOTSMTP)| /* no_callout_flush */ | |
45b91596 | 712 | (1<<ACL_WHERE_NOTSMTP_START) |
c5fcb476 PH |
713 | }; |
714 | ||
715 | /* Structure listing various control arguments, with their characteristics. */ | |
059ec3d9 PH |
716 | |
717 | typedef struct control_def { | |
718 | uschar *name; | |
719 | int value; /* CONTROL_xxx value */ | |
059ec3d9 PH |
720 | BOOL has_option; /* Has /option(s) following */ |
721 | } control_def; | |
722 | ||
723 | static control_def controls_list[] = { | |
3c8b3577 | 724 | { US"allow_auth_unadvertised", CONTROL_AUTH_UNADVERTISED, FALSE }, |
8523533c | 725 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
3c8b3577 | 726 | { US"bmi_run", CONTROL_BMI_RUN, FALSE }, |
fb2274d4 | 727 | #endif |
3c8b3577 | 728 | { US"debug", CONTROL_DEBUG, TRUE }, |
80a47a2c | 729 | #ifndef DISABLE_DKIM |
3c8b3577 | 730 | { US"dkim_disable_verify", CONTROL_DKIM_VERIFY, FALSE }, |
4840604e TL |
731 | #endif |
732 | #ifdef EXPERIMENTAL_DMARC | |
3c8b3577 JH |
733 | { US"dmarc_disable_verify", CONTROL_DMARC_VERIFY, FALSE }, |
734 | { US"dmarc_enable_forensic", CONTROL_DMARC_FORENSIC, FALSE }, | |
8523533c | 735 | #endif |
3c8b3577 JH |
736 | { US"dscp", CONTROL_DSCP, TRUE }, |
737 | { US"caseful_local_part", CONTROL_CASEFUL_LOCAL_PART, FALSE }, | |
738 | { US"caselower_local_part", CONTROL_CASELOWER_LOCAL_PART, FALSE }, | |
739 | { US"enforce_sync", CONTROL_ENFORCE_SYNC, FALSE }, | |
740 | { US"freeze", CONTROL_FREEZE, TRUE }, | |
741 | { US"no_callout_flush", CONTROL_NO_CALLOUT_FLUSH, FALSE }, | |
742 | { US"no_delay_flush", CONTROL_NO_DELAY_FLUSH, FALSE }, | |
743 | { US"no_enforce_sync", CONTROL_NO_ENFORCE_SYNC, FALSE }, | |
744 | { US"no_multiline_responses", CONTROL_NO_MULTILINE, FALSE }, | |
745 | { US"no_pipelining", CONTROL_NO_PIPELINING, FALSE }, | |
746 | { US"queue_only", CONTROL_QUEUE_ONLY, FALSE }, | |
8523533c | 747 | #ifdef WITH_CONTENT_SCAN |
3c8b3577 | 748 | { US"no_mbox_unspool", CONTROL_NO_MBOX_UNSPOOL, FALSE }, |
8523533c | 749 | #endif |
3c8b3577 JH |
750 | { US"fakedefer", CONTROL_FAKEDEFER, TRUE }, |
751 | { US"fakereject", CONTROL_FAKEREJECT, TRUE }, | |
752 | { US"submission", CONTROL_SUBMISSION, TRUE }, | |
e4bdf652 | 753 | { US"suppress_local_fixups", CONTROL_SUPPRESS_LOCAL_FIXUPS, FALSE }, |
3c8b3577 | 754 | { US"cutthrough_delivery", CONTROL_CUTTHROUGH_DELIVERY, FALSE }, |
8c5d388a | 755 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
756 | { US"utf8_downconvert", CONTROL_UTF8_DOWNCONVERT, TRUE } |
757 | #endif | |
059ec3d9 PH |
758 | }; |
759 | ||
e5a9dba6 PH |
760 | /* Support data structures for Client SMTP Authorization. acl_verify_csa() |
761 | caches its result in a tree to avoid repeated DNS queries. The result is an | |
762 | integer code which is used as an index into the following tables of | |
763 | explanatory strings and verification return codes. */ | |
764 | ||
765 | static tree_node *csa_cache = NULL; | |
766 | ||
767 | enum { CSA_UNKNOWN, CSA_OK, CSA_DEFER_SRV, CSA_DEFER_ADDR, | |
768 | CSA_FAIL_EXPLICIT, CSA_FAIL_DOMAIN, CSA_FAIL_NOADDR, CSA_FAIL_MISMATCH }; | |
769 | ||
770 | /* The acl_verify_csa() return code is translated into an acl_verify() return | |
771 | code using the following table. It is OK unless the client is definitely not | |
772 | authorized. This is because CSA is supposed to be optional for sending sites, | |
773 | so recipients should not be too strict about checking it - especially because | |
774 | DNS problems are quite likely to occur. It's possible to use $csa_status in | |
775 | further ACL conditions to distinguish ok, unknown, and defer if required, but | |
776 | the aim is to make the usual configuration simple. */ | |
777 | ||
778 | static int csa_return_code[] = { | |
779 | OK, OK, OK, OK, | |
780 | FAIL, FAIL, FAIL, FAIL | |
781 | }; | |
782 | ||
783 | static uschar *csa_status_string[] = { | |
784 | US"unknown", US"ok", US"defer", US"defer", | |
785 | US"fail", US"fail", US"fail", US"fail" | |
786 | }; | |
787 | ||
788 | static uschar *csa_reason_string[] = { | |
789 | US"unknown", | |
790 | US"ok", | |
791 | US"deferred (SRV lookup failed)", | |
792 | US"deferred (target address lookup failed)", | |
793 | US"failed (explicit authorization required)", | |
794 | US"failed (host name not authorized)", | |
795 | US"failed (no authorized addresses)", | |
796 | US"failed (client address mismatch)" | |
797 | }; | |
798 | ||
c99ce5c9 TF |
799 | /* Options for the ratelimit condition. Note that there are two variants of |
800 | the per_rcpt option, depending on the ACL that is used to measure the rate. | |
801 | However any ACL must be able to look up per_rcpt rates in /noupdate mode, | |
802 | so the two variants must have the same internal representation as well as | |
803 | the same configuration string. */ | |
804 | ||
805 | enum { | |
806 | RATE_PER_WHAT, RATE_PER_CLASH, RATE_PER_ADDR, RATE_PER_BYTE, RATE_PER_CMD, | |
807 | RATE_PER_CONN, RATE_PER_MAIL, RATE_PER_RCPT, RATE_PER_ALLRCPTS | |
808 | }; | |
809 | ||
810 | #define RATE_SET(var,new) \ | |
811 | (((var) == RATE_PER_WHAT) ? ((var) = RATE_##new) : ((var) = RATE_PER_CLASH)) | |
812 | ||
813 | static uschar *ratelimit_option_string[] = { | |
814 | US"?", US"!", US"per_addr", US"per_byte", US"per_cmd", | |
815 | US"per_conn", US"per_mail", US"per_rcpt", US"per_rcpt" | |
816 | }; | |
817 | ||
059ec3d9 PH |
818 | /* Enable recursion between acl_check_internal() and acl_check_condition() */ |
819 | ||
55414b25 | 820 | static int acl_check_wargs(int, address_item *, const uschar *, int, uschar **, |
f60d98e8 | 821 | uschar **); |
059ec3d9 PH |
822 | |
823 | ||
824 | /************************************************* | |
825 | * Pick out name from list * | |
826 | *************************************************/ | |
827 | ||
828 | /* Use a binary chop method | |
829 | ||
830 | Arguments: | |
831 | name name to find | |
832 | list list of names | |
833 | end size of list | |
834 | ||
835 | Returns: offset in list, or -1 if not found | |
836 | */ | |
837 | ||
838 | static int | |
839 | acl_checkname(uschar *name, uschar **list, int end) | |
840 | { | |
841 | int start = 0; | |
842 | ||
843 | while (start < end) | |
844 | { | |
845 | int mid = (start + end)/2; | |
846 | int c = Ustrcmp(name, list[mid]); | |
847 | if (c == 0) return mid; | |
848 | if (c < 0) end = mid; else start = mid + 1; | |
849 | } | |
850 | ||
851 | return -1; | |
852 | } | |
853 | ||
854 | ||
855 | /************************************************* | |
856 | * Read and parse one ACL * | |
857 | *************************************************/ | |
858 | ||
859 | /* This function is called both from readconf in order to parse the ACLs in the | |
860 | configuration file, and also when an ACL is encountered dynamically (e.g. as | |
861 | the result of an expansion). It is given a function to call in order to | |
862 | retrieve the lines of the ACL. This function handles skipping comments and | |
863 | blank lines (where relevant). | |
864 | ||
865 | Arguments: | |
866 | func function to get next line of ACL | |
867 | error where to put an error message | |
868 | ||
869 | Returns: pointer to ACL, or NULL | |
870 | NULL can be legal (empty ACL); in this case error will be NULL | |
871 | */ | |
872 | ||
873 | acl_block * | |
874 | acl_read(uschar *(*func)(void), uschar **error) | |
875 | { | |
876 | acl_block *yield = NULL; | |
877 | acl_block **lastp = &yield; | |
878 | acl_block *this = NULL; | |
879 | acl_condition_block *cond; | |
880 | acl_condition_block **condp = NULL; | |
881 | uschar *s; | |
882 | ||
883 | *error = NULL; | |
884 | ||
885 | while ((s = (*func)()) != NULL) | |
886 | { | |
887 | int v, c; | |
888 | BOOL negated = FALSE; | |
889 | uschar *saveline = s; | |
890 | uschar name[64]; | |
891 | ||
892 | /* Conditions (but not verbs) are allowed to be negated by an initial | |
893 | exclamation mark. */ | |
894 | ||
895 | while (isspace(*s)) s++; | |
896 | if (*s == '!') | |
897 | { | |
898 | negated = TRUE; | |
899 | s++; | |
900 | } | |
901 | ||
cf00dad6 PH |
902 | /* Read the name of a verb or a condition, or the start of a new ACL, which |
903 | can be started by a name, or by a macro definition. */ | |
059ec3d9 PH |
904 | |
905 | s = readconf_readname(name, sizeof(name), s); | |
b8dc3e4a | 906 | if (*s == ':' || (isupper(name[0]) && *s == '=')) return yield; |
059ec3d9 PH |
907 | |
908 | /* If a verb is unrecognized, it may be another condition or modifier that | |
909 | continues the previous verb. */ | |
910 | ||
911 | v = acl_checkname(name, verbs, sizeof(verbs)/sizeof(char *)); | |
912 | if (v < 0) | |
913 | { | |
914 | if (this == NULL) | |
915 | { | |
4e167a8c PH |
916 | *error = string_sprintf("unknown ACL verb \"%s\" in \"%s\"", name, |
917 | saveline); | |
059ec3d9 PH |
918 | return NULL; |
919 | } | |
920 | } | |
921 | ||
922 | /* New verb */ | |
923 | ||
924 | else | |
925 | { | |
926 | if (negated) | |
927 | { | |
928 | *error = string_sprintf("malformed ACL line \"%s\"", saveline); | |
929 | return NULL; | |
930 | } | |
931 | this = store_get(sizeof(acl_block)); | |
932 | *lastp = this; | |
933 | lastp = &(this->next); | |
934 | this->next = NULL; | |
935 | this->verb = v; | |
936 | this->condition = NULL; | |
937 | condp = &(this->condition); | |
938 | if (*s == 0) continue; /* No condition on this line */ | |
939 | if (*s == '!') | |
940 | { | |
941 | negated = TRUE; | |
942 | s++; | |
943 | } | |
944 | s = readconf_readname(name, sizeof(name), s); /* Condition name */ | |
945 | } | |
946 | ||
947 | /* Handle a condition or modifier. */ | |
948 | ||
949 | c = acl_checkname(name, conditions, sizeof(conditions)/sizeof(char *)); | |
950 | if (c < 0) | |
951 | { | |
952 | *error = string_sprintf("unknown ACL condition/modifier in \"%s\"", | |
953 | saveline); | |
954 | return NULL; | |
955 | } | |
956 | ||
957 | /* The modifiers may not be negated */ | |
958 | ||
959 | if (negated && cond_modifiers[c]) | |
960 | { | |
961 | *error = string_sprintf("ACL error: negation is not allowed with " | |
962 | "\"%s\"", conditions[c]); | |
963 | return NULL; | |
964 | } | |
965 | ||
966 | /* ENDPASS may occur only with ACCEPT or DISCARD. */ | |
967 | ||
968 | if (c == ACLC_ENDPASS && | |
969 | this->verb != ACL_ACCEPT && | |
970 | this->verb != ACL_DISCARD) | |
971 | { | |
972 | *error = string_sprintf("ACL error: \"%s\" is not allowed with \"%s\"", | |
973 | conditions[c], verbs[this->verb]); | |
974 | return NULL; | |
975 | } | |
976 | ||
977 | cond = store_get(sizeof(acl_condition_block)); | |
978 | cond->next = NULL; | |
979 | cond->type = c; | |
980 | cond->u.negated = negated; | |
981 | ||
982 | *condp = cond; | |
983 | condp = &(cond->next); | |
984 | ||
985 | /* The "set" modifier is different in that its argument is "name=value" | |
986 | rather than just a value, and we can check the validity of the name, which | |
38a0a95f PH |
987 | gives us a variable name to insert into the data block. The original ACL |
988 | variable names were acl_c0 ... acl_c9 and acl_m0 ... acl_m9. This was | |
989 | extended to 20 of each type, but after that people successfully argued for | |
641cb756 PH |
990 | arbitrary names. In the new scheme, the names must start with acl_c or acl_m. |
991 | After that, we allow alphanumerics and underscores, but the first character | |
992 | after c or m must be a digit or an underscore. This retains backwards | |
993 | compatibility. */ | |
059ec3d9 PH |
994 | |
995 | if (c == ACLC_SET) | |
996 | { | |
47ca6d6c PH |
997 | uschar *endptr; |
998 | ||
38a0a95f PH |
999 | if (Ustrncmp(s, "acl_c", 5) != 0 && |
1000 | Ustrncmp(s, "acl_m", 5) != 0) | |
47ca6d6c | 1001 | { |
38a0a95f PH |
1002 | *error = string_sprintf("invalid variable name after \"set\" in ACL " |
1003 | "modifier \"set %s\" (must start \"acl_c\" or \"acl_m\")", s); | |
1004 | return NULL; | |
47ca6d6c | 1005 | } |
38a0a95f PH |
1006 | |
1007 | endptr = s + 5; | |
641cb756 PH |
1008 | if (!isdigit(*endptr) && *endptr != '_') |
1009 | { | |
1010 | *error = string_sprintf("invalid variable name after \"set\" in ACL " | |
1011 | "modifier \"set %s\" (digit or underscore must follow acl_c or acl_m)", | |
1012 | s); | |
1013 | return NULL; | |
1014 | } | |
1015 | ||
38a0a95f | 1016 | while (*endptr != 0 && *endptr != '=' && !isspace(*endptr)) |
47ca6d6c | 1017 | { |
38a0a95f PH |
1018 | if (!isalnum(*endptr) && *endptr != '_') |
1019 | { | |
1020 | *error = string_sprintf("invalid character \"%c\" in variable name " | |
1021 | "in ACL modifier \"set %s\"", *endptr, s); | |
1022 | return NULL; | |
1023 | } | |
1024 | endptr++; | |
47ca6d6c | 1025 | } |
47ca6d6c | 1026 | |
38a0a95f | 1027 | cond->u.varname = string_copyn(s + 4, endptr - s - 4); |
47ca6d6c | 1028 | s = endptr; |
059ec3d9 PH |
1029 | while (isspace(*s)) s++; |
1030 | } | |
1031 | ||
1032 | /* For "set", we are now positioned for the data. For the others, only | |
1033 | "endpass" has no data */ | |
1034 | ||
1035 | if (c != ACLC_ENDPASS) | |
1036 | { | |
1037 | if (*s++ != '=') | |
1038 | { | |
1039 | *error = string_sprintf("\"=\" missing after ACL \"%s\" %s", name, | |
1040 | cond_modifiers[c]? US"modifier" : US"condition"); | |
1041 | return NULL; | |
1042 | } | |
1043 | while (isspace(*s)) s++; | |
1044 | cond->arg = string_copy(s); | |
1045 | } | |
1046 | } | |
1047 | ||
1048 | return yield; | |
1049 | } | |
1050 | ||
1051 | ||
1052 | ||
71fafd95 PH |
1053 | /************************************************* |
1054 | * Set up added header line(s) * | |
1055 | *************************************************/ | |
1056 | ||
1057 | /* This function is called by the add_header modifier, and also from acl_warn() | |
1058 | to implement the now-deprecated way of adding header lines using "message" on a | |
1059 | "warn" verb. The argument is treated as a sequence of header lines which are | |
1060 | added to a chain, provided there isn't an identical one already there. | |
1061 | ||
1062 | Argument: string of header lines | |
1063 | Returns: nothing | |
1064 | */ | |
1065 | ||
1066 | static void | |
55414b25 | 1067 | setup_header(const uschar *hstring) |
71fafd95 | 1068 | { |
55414b25 | 1069 | const uschar *p, *q; |
71fafd95 PH |
1070 | int hlen = Ustrlen(hstring); |
1071 | ||
b1b05573 JH |
1072 | /* Ignore any leading newlines */ |
1073 | while (*hstring == '\n') hstring++, hlen--; | |
71fafd95 | 1074 | |
b1b05573 | 1075 | /* An empty string does nothing; ensure exactly one final newline. */ |
71fafd95 | 1076 | if (hlen <= 0) return; |
55414b25 JH |
1077 | if (hstring[--hlen] != '\n') |
1078 | q = string_sprintf("%s\n", hstring); | |
1079 | else if (hstring[hlen-1] == '\n') | |
1080 | { | |
1081 | uschar * s = string_copy(hstring); | |
1082 | while(s[--hlen] == '\n') | |
1083 | s[hlen+1] = '\0'; | |
1084 | q = s; | |
1085 | } | |
1086 | else | |
1087 | q = hstring; | |
71fafd95 PH |
1088 | |
1089 | /* Loop for multiple header lines, taking care about continuations */ | |
1090 | ||
55414b25 | 1091 | for (p = q; *p != 0; ) |
71fafd95 | 1092 | { |
55414b25 JH |
1093 | const uschar *s; |
1094 | uschar * hdr; | |
71fafd95 PH |
1095 | int newtype = htype_add_bot; |
1096 | header_line **hptr = &acl_added_headers; | |
1097 | ||
1098 | /* Find next header line within the string */ | |
1099 | ||
1100 | for (;;) | |
1101 | { | |
1102 | q = Ustrchr(q, '\n'); | |
1103 | if (*(++q) != ' ' && *q != '\t') break; | |
1104 | } | |
1105 | ||
1106 | /* If the line starts with a colon, interpret the instruction for where to | |
1107 | add it. This temporarily sets up a new type. */ | |
1108 | ||
1109 | if (*p == ':') | |
1110 | { | |
1111 | if (strncmpic(p, US":after_received:", 16) == 0) | |
1112 | { | |
1113 | newtype = htype_add_rec; | |
1114 | p += 16; | |
1115 | } | |
1116 | else if (strncmpic(p, US":at_start_rfc:", 14) == 0) | |
1117 | { | |
1118 | newtype = htype_add_rfc; | |
1119 | p += 14; | |
1120 | } | |
1121 | else if (strncmpic(p, US":at_start:", 10) == 0) | |
1122 | { | |
1123 | newtype = htype_add_top; | |
1124 | p += 10; | |
1125 | } | |
1126 | else if (strncmpic(p, US":at_end:", 8) == 0) | |
1127 | { | |
1128 | newtype = htype_add_bot; | |
1129 | p += 8; | |
1130 | } | |
1131 | while (*p == ' ' || *p == '\t') p++; | |
1132 | } | |
1133 | ||
1134 | /* See if this line starts with a header name, and if not, add X-ACL-Warn: | |
1135 | to the front of it. */ | |
1136 | ||
1137 | for (s = p; s < q - 1; s++) | |
1138 | { | |
1139 | if (*s == ':' || !isgraph(*s)) break; | |
1140 | } | |
1141 | ||
55414b25 JH |
1142 | hdr = string_sprintf("%s%.*s", (*s == ':')? "" : "X-ACL-Warn: ", (int) (q - p), p); |
1143 | hlen = Ustrlen(hdr); | |
71fafd95 PH |
1144 | |
1145 | /* See if this line has already been added */ | |
1146 | ||
1147 | while (*hptr != NULL) | |
1148 | { | |
55414b25 | 1149 | if (Ustrncmp((*hptr)->text, hdr, hlen) == 0) break; |
71fafd95 PH |
1150 | hptr = &((*hptr)->next); |
1151 | } | |
1152 | ||
1153 | /* Add if not previously present */ | |
1154 | ||
1155 | if (*hptr == NULL) | |
1156 | { | |
1157 | header_line *h = store_get(sizeof(header_line)); | |
55414b25 | 1158 | h->text = hdr; |
71fafd95 PH |
1159 | h->next = NULL; |
1160 | h->type = newtype; | |
1161 | h->slen = hlen; | |
1162 | *hptr = h; | |
1163 | hptr = &(h->next); | |
1164 | } | |
1165 | ||
1166 | /* Advance for next header line within the string */ | |
1167 | ||
1168 | p = q; | |
1169 | } | |
1170 | } | |
1171 | ||
1172 | ||
1173 | ||
362145b5 JH |
1174 | /************************************************* |
1175 | * List the added header lines * | |
1176 | *************************************************/ | |
1177 | uschar * | |
1178 | fn_hdrs_added(void) | |
1179 | { | |
1180 | uschar * ret = NULL; | |
1181 | header_line * h = acl_added_headers; | |
1182 | uschar * s; | |
1183 | uschar * cp; | |
1184 | int size = 0; | |
1185 | int ptr = 0; | |
1186 | ||
1187 | if (!h) return NULL; | |
1188 | ||
1189 | do | |
1190 | { | |
1191 | s = h->text; | |
1192 | while ((cp = Ustrchr(s, '\n')) != NULL) | |
1193 | { | |
1194 | if (cp[1] == '\0') break; | |
1195 | ||
1196 | /* contains embedded newline; needs doubling */ | |
1197 | ret = string_cat(ret, &size, &ptr, s, cp-s+1); | |
6d9cfc47 | 1198 | ret = string_cat(ret, &size, &ptr, US"\n", 1); |
362145b5 JH |
1199 | s = cp+1; |
1200 | } | |
1201 | /* last bit of header */ | |
1202 | ||
1203 | ret = string_cat(ret, &size, &ptr, s, cp-s+1); /* newline-sep list */ | |
1204 | } | |
6d9cfc47 | 1205 | while((h = h->next)); |
362145b5 JH |
1206 | |
1207 | ret[ptr-1] = '\0'; /* overwrite last newline */ | |
1208 | return ret; | |
1209 | } | |
1210 | ||
1211 | ||
e7568d51 TL |
1212 | /************************************************* |
1213 | * Set up removed header line(s) * | |
1214 | *************************************************/ | |
1215 | ||
1216 | /* This function is called by the remove_header modifier. The argument is | |
1217 | treated as a sequence of header names which are added to a colon separated | |
1218 | list, provided there isn't an identical one already there. | |
1219 | ||
1220 | Argument: string of header names | |
1221 | Returns: nothing | |
1222 | */ | |
1223 | ||
1224 | static void | |
55414b25 | 1225 | setup_remove_header(const uschar *hnames) |
e7568d51 TL |
1226 | { |
1227 | if (*hnames != 0) | |
55414b25 JH |
1228 | acl_removed_headers = acl_removed_headers |
1229 | ? string_sprintf("%s : %s", acl_removed_headers, hnames) | |
1230 | : string_copy(hnames); | |
e7568d51 TL |
1231 | } |
1232 | ||
1233 | ||
71fafd95 | 1234 | |
059ec3d9 PH |
1235 | /************************************************* |
1236 | * Handle warnings * | |
1237 | *************************************************/ | |
1238 | ||
1239 | /* This function is called when a WARN verb's conditions are true. It adds to | |
1240 | the message's headers, and/or writes information to the log. In each case, this | |
1241 | only happens once (per message for headers, per connection for log). | |
1242 | ||
71fafd95 PH |
1243 | ** NOTE: The header adding action using the "message" setting is historic, and |
1244 | its use is now deprecated. The new add_header modifier should be used instead. | |
1245 | ||
059ec3d9 PH |
1246 | Arguments: |
1247 | where ACL_WHERE_xxxx indicating which ACL this is | |
1248 | user_message message for adding to headers | |
1249 | log_message message for logging, if different | |
1250 | ||
1251 | Returns: nothing | |
1252 | */ | |
1253 | ||
1254 | static void | |
1255 | acl_warn(int where, uschar *user_message, uschar *log_message) | |
1256 | { | |
059ec3d9 PH |
1257 | if (log_message != NULL && log_message != user_message) |
1258 | { | |
1259 | uschar *text; | |
1260 | string_item *logged; | |
1261 | ||
1262 | text = string_sprintf("%s Warning: %s", host_and_ident(TRUE), | |
1263 | string_printing(log_message)); | |
1264 | ||
1265 | /* If a sender verification has failed, and the log message is "sender verify | |
1266 | failed", add the failure message. */ | |
1267 | ||
1268 | if (sender_verified_failed != NULL && | |
1269 | sender_verified_failed->message != NULL && | |
1270 | strcmpic(log_message, US"sender verify failed") == 0) | |
1271 | text = string_sprintf("%s: %s", text, sender_verified_failed->message); | |
1272 | ||
9c7a242c PH |
1273 | /* Search previously logged warnings. They are kept in malloc |
1274 | store so they can be freed at the start of a new message. */ | |
059ec3d9 PH |
1275 | |
1276 | for (logged = acl_warn_logged; logged != NULL; logged = logged->next) | |
1277 | if (Ustrcmp(logged->text, text) == 0) break; | |
1278 | ||
1279 | if (logged == NULL) | |
1280 | { | |
1281 | int length = Ustrlen(text) + 1; | |
1282 | log_write(0, LOG_MAIN, "%s", text); | |
1283 | logged = store_malloc(sizeof(string_item) + length); | |
1284 | logged->text = (uschar *)logged + sizeof(string_item); | |
1285 | memcpy(logged->text, text, length); | |
1286 | logged->next = acl_warn_logged; | |
1287 | acl_warn_logged = logged; | |
1288 | } | |
1289 | } | |
1290 | ||
1291 | /* If there's no user message, we are done. */ | |
1292 | ||
1293 | if (user_message == NULL) return; | |
1294 | ||
1295 | /* If this isn't a message ACL, we can't do anything with a user message. | |
1296 | Log an error. */ | |
1297 | ||
1298 | if (where > ACL_WHERE_NOTSMTP) | |
1299 | { | |
1300 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting " | |
1301 | "found in a non-message (%s) ACL: cannot specify header lines here: " | |
1302 | "message ignored", acl_wherenames[where]); | |
1303 | return; | |
1304 | } | |
1305 | ||
71fafd95 PH |
1306 | /* The code for setting up header lines is now abstracted into a separate |
1307 | function so that it can be used for the add_header modifier as well. */ | |
059ec3d9 | 1308 | |
71fafd95 | 1309 | setup_header(user_message); |
059ec3d9 PH |
1310 | } |
1311 | ||
1312 | ||
1313 | ||
1314 | /************************************************* | |
1315 | * Verify and check reverse DNS * | |
1316 | *************************************************/ | |
1317 | ||
1318 | /* Called from acl_verify() below. We look up the host name(s) of the client IP | |
1319 | address if this has not yet been done. The host_name_lookup() function checks | |
1320 | that one of these names resolves to an address list that contains the client IP | |
1321 | address, so we don't actually have to do the check here. | |
1322 | ||
1323 | Arguments: | |
1324 | user_msgptr pointer for user message | |
1325 | log_msgptr pointer for log message | |
1326 | ||
1327 | Returns: OK verification condition succeeded | |
1328 | FAIL verification failed | |
1329 | DEFER there was a problem verifying | |
1330 | */ | |
1331 | ||
1332 | static int | |
1333 | acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr) | |
1334 | { | |
1335 | int rc; | |
1336 | ||
1337 | user_msgptr = user_msgptr; /* stop compiler warning */ | |
1338 | ||
1339 | /* Previous success */ | |
1340 | ||
1341 | if (sender_host_name != NULL) return OK; | |
1342 | ||
1343 | /* Previous failure */ | |
1344 | ||
1345 | if (host_lookup_failed) | |
1346 | { | |
1347 | *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg); | |
1348 | return FAIL; | |
1349 | } | |
1350 | ||
1351 | /* Need to do a lookup */ | |
1352 | ||
1353 | HDEBUG(D_acl) | |
1354 | debug_printf("looking up host name to force name/address consistency check\n"); | |
1355 | ||
1356 | if ((rc = host_name_lookup()) != OK) | |
1357 | { | |
1358 | *log_msgptr = (rc == DEFER)? | |
1359 | US"host lookup deferred for reverse lookup check" | |
1360 | : | |
1361 | string_sprintf("host lookup failed for reverse lookup check%s", | |
1362 | host_lookup_msg); | |
1363 | return rc; /* DEFER or FAIL */ | |
1364 | } | |
1365 | ||
1366 | host_build_sender_fullhost(); | |
1367 | return OK; | |
1368 | } | |
1369 | ||
1370 | ||
1371 | ||
e5a9dba6 PH |
1372 | /************************************************* |
1373 | * Check client IP address matches CSA target * | |
1374 | *************************************************/ | |
1375 | ||
1376 | /* Called from acl_verify_csa() below. This routine scans a section of a DNS | |
1377 | response for address records belonging to the CSA target hostname. The section | |
1378 | is specified by the reset argument, either RESET_ADDITIONAL or RESET_ANSWERS. | |
1379 | If one of the addresses matches the client's IP address, then the client is | |
1380 | authorized by CSA. If there are target IP addresses but none of them match | |
1381 | then the client is using an unauthorized IP address. If there are no target IP | |
1382 | addresses then the client cannot be using an authorized IP address. (This is | |
1383 | an odd configuration - why didn't the SRV record have a weight of 1 instead?) | |
1384 | ||
1385 | Arguments: | |
1386 | dnsa the DNS answer block | |
1387 | dnss a DNS scan block for us to use | |
1388 | reset option specifing what portion to scan, as described above | |
1389 | target the target hostname to use for matching RR names | |
1390 | ||
1391 | Returns: CSA_OK successfully authorized | |
1392 | CSA_FAIL_MISMATCH addresses found but none matched | |
1393 | CSA_FAIL_NOADDR no target addresses found | |
1394 | */ | |
1395 | ||
1396 | static int | |
1397 | acl_verify_csa_address(dns_answer *dnsa, dns_scan *dnss, int reset, | |
1398 | uschar *target) | |
1399 | { | |
1400 | dns_record *rr; | |
1401 | dns_address *da; | |
1402 | ||
1403 | BOOL target_found = FALSE; | |
1404 | ||
1405 | for (rr = dns_next_rr(dnsa, dnss, reset); | |
1406 | rr != NULL; | |
1407 | rr = dns_next_rr(dnsa, dnss, RESET_NEXT)) | |
1408 | { | |
1409 | /* Check this is an address RR for the target hostname. */ | |
1410 | ||
1411 | if (rr->type != T_A | |
1412 | #if HAVE_IPV6 | |
1413 | && rr->type != T_AAAA | |
e5a9dba6 PH |
1414 | #endif |
1415 | ) continue; | |
1416 | ||
1417 | if (strcmpic(target, rr->name) != 0) continue; | |
1418 | ||
1419 | target_found = TRUE; | |
1420 | ||
1421 | /* Turn the target address RR into a list of textual IP addresses and scan | |
1422 | the list. There may be more than one if it is an A6 RR. */ | |
1423 | ||
1424 | for (da = dns_address_from_rr(dnsa, rr); da != NULL; da = da->next) | |
1425 | { | |
1426 | /* If the client IP address matches the target IP address, it's good! */ | |
1427 | ||
1428 | DEBUG(D_acl) debug_printf("CSA target address is %s\n", da->address); | |
1429 | ||
1430 | if (strcmpic(sender_host_address, da->address) == 0) return CSA_OK; | |
1431 | } | |
1432 | } | |
1433 | ||
1434 | /* If we found some target addresses but none of them matched, the client is | |
1435 | using an unauthorized IP address, otherwise the target has no authorized IP | |
1436 | addresses. */ | |
1437 | ||
1438 | if (target_found) return CSA_FAIL_MISMATCH; | |
1439 | else return CSA_FAIL_NOADDR; | |
1440 | } | |
1441 | ||
1442 | ||
1443 | ||
1444 | /************************************************* | |
1445 | * Verify Client SMTP Authorization * | |
1446 | *************************************************/ | |
1447 | ||
1448 | /* Called from acl_verify() below. This routine calls dns_lookup_special() | |
1449 | to find the CSA SRV record corresponding to the domain argument, or | |
1450 | $sender_helo_name if no argument is provided. It then checks that the | |
1451 | client is authorized, and that its IP address corresponds to the SRV | |
1452 | target's address by calling acl_verify_csa_address() above. The address | |
1453 | should have been returned in the DNS response's ADDITIONAL section, but if | |
1454 | not we perform another DNS lookup to get it. | |
1455 | ||
1456 | Arguments: | |
1457 | domain pointer to optional parameter following verify = csa | |
1458 | ||
1459 | Returns: CSA_UNKNOWN no valid CSA record found | |
1460 | CSA_OK successfully authorized | |
1461 | CSA_FAIL_* client is definitely not authorized | |
1462 | CSA_DEFER_* there was a DNS problem | |
1463 | */ | |
1464 | ||
1465 | static int | |
55414b25 | 1466 | acl_verify_csa(const uschar *domain) |
e5a9dba6 PH |
1467 | { |
1468 | tree_node *t; | |
55414b25 JH |
1469 | const uschar *found; |
1470 | uschar *p; | |
e5a9dba6 PH |
1471 | int priority, weight, port; |
1472 | dns_answer dnsa; | |
1473 | dns_scan dnss; | |
1474 | dns_record *rr; | |
1475 | int rc, type; | |
1476 | uschar target[256]; | |
1477 | ||
1478 | /* Work out the domain we are using for the CSA lookup. The default is the | |
1479 | client's HELO domain. If the client has not said HELO, use its IP address | |
1480 | instead. If it's a local client (exim -bs), CSA isn't applicable. */ | |
1481 | ||
1482 | while (isspace(*domain) && *domain != '\0') ++domain; | |
1483 | if (*domain == '\0') domain = sender_helo_name; | |
1484 | if (domain == NULL) domain = sender_host_address; | |
1485 | if (sender_host_address == NULL) return CSA_UNKNOWN; | |
1486 | ||
1487 | /* If we have an address literal, strip off the framing ready for turning it | |
1488 | into a domain. The framing consists of matched square brackets possibly | |
1489 | containing a keyword and a colon before the actual IP address. */ | |
1490 | ||
1491 | if (domain[0] == '[') | |
1492 | { | |
55414b25 | 1493 | const uschar *start = Ustrchr(domain, ':'); |
e5a9dba6 PH |
1494 | if (start == NULL) start = domain; |
1495 | domain = string_copyn(start + 1, Ustrlen(start) - 2); | |
1496 | } | |
1497 | ||
1498 | /* Turn domains that look like bare IP addresses into domains in the reverse | |
1499 | DNS. This code also deals with address literals and $sender_host_address. It's | |
1500 | not quite kosher to treat bare domains such as EHLO 192.0.2.57 the same as | |
1501 | address literals, but it's probably the most friendly thing to do. This is an | |
1502 | extension to CSA, so we allow it to be turned off for proper conformance. */ | |
1503 | ||
7e66e54d | 1504 | if (string_is_ip_address(domain, NULL) != 0) |
e5a9dba6 PH |
1505 | { |
1506 | if (!dns_csa_use_reverse) return CSA_UNKNOWN; | |
1507 | dns_build_reverse(domain, target); | |
1508 | domain = target; | |
1509 | } | |
1510 | ||
1511 | /* Find out if we've already done the CSA check for this domain. If we have, | |
1512 | return the same result again. Otherwise build a new cached result structure | |
1513 | for this domain. The name is filled in now, and the value is filled in when | |
1514 | we return from this function. */ | |
1515 | ||
1516 | t = tree_search(csa_cache, domain); | |
1517 | if (t != NULL) return t->data.val; | |
1518 | ||
1519 | t = store_get_perm(sizeof(tree_node) + Ustrlen(domain)); | |
1520 | Ustrcpy(t->name, domain); | |
1521 | (void)tree_insertnode(&csa_cache, t); | |
1522 | ||
1523 | /* Now we are ready to do the actual DNS lookup(s). */ | |
1524 | ||
28e6ef29 | 1525 | found = domain; |
e5a9dba6 PH |
1526 | switch (dns_special_lookup(&dnsa, domain, T_CSA, &found)) |
1527 | { | |
1528 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1529 | ||
1530 | default: | |
1531 | return t->data.val = CSA_DEFER_SRV; | |
1532 | ||
1533 | /* If we found nothing, the client's authorization is unknown. */ | |
1534 | ||
1535 | case DNS_NOMATCH: | |
1536 | case DNS_NODATA: | |
1537 | return t->data.val = CSA_UNKNOWN; | |
1538 | ||
1539 | /* We got something! Go on to look at the reply in more detail. */ | |
1540 | ||
1541 | case DNS_SUCCEED: | |
1542 | break; | |
1543 | } | |
1544 | ||
1545 | /* Scan the reply for well-formed CSA SRV records. */ | |
1546 | ||
1547 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
1548 | rr != NULL; | |
1549 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
1550 | { | |
1551 | if (rr->type != T_SRV) continue; | |
1552 | ||
1553 | /* Extract the numerical SRV fields (p is incremented) */ | |
1554 | ||
1555 | p = rr->data; | |
1556 | GETSHORT(priority, p); | |
1557 | GETSHORT(weight, p); | |
1558 | GETSHORT(port, p); | |
1559 | ||
1560 | DEBUG(D_acl) | |
1561 | debug_printf("CSA priority=%d weight=%d port=%d\n", priority, weight, port); | |
1562 | ||
1563 | /* Check the CSA version number */ | |
1564 | ||
1565 | if (priority != 1) continue; | |
1566 | ||
1567 | /* If the domain does not have a CSA SRV record of its own (i.e. the domain | |
1568 | found by dns_special_lookup() is a parent of the one we asked for), we check | |
1569 | the subdomain assertions in the port field. At the moment there's only one | |
1570 | assertion: legitimate SMTP clients are all explicitly authorized with CSA | |
1571 | SRV records of their own. */ | |
1572 | ||
1dc92d5a | 1573 | if (Ustrcmp(found, domain) != 0) |
e5a9dba6 PH |
1574 | { |
1575 | if (port & 1) | |
1576 | return t->data.val = CSA_FAIL_EXPLICIT; | |
1577 | else | |
1578 | return t->data.val = CSA_UNKNOWN; | |
1579 | } | |
1580 | ||
1581 | /* This CSA SRV record refers directly to our domain, so we check the value | |
1582 | in the weight field to work out the domain's authorization. 0 and 1 are | |
1583 | unauthorized; 3 means the client is authorized but we can't check the IP | |
1584 | address in order to authenticate it, so we treat it as unknown; values | |
1585 | greater than 3 are undefined. */ | |
1586 | ||
1587 | if (weight < 2) return t->data.val = CSA_FAIL_DOMAIN; | |
1588 | ||
1589 | if (weight > 2) continue; | |
1590 | ||
1591 | /* Weight == 2, which means the domain is authorized. We must check that the | |
1592 | client's IP address is listed as one of the SRV target addresses. Save the | |
1593 | target hostname then break to scan the additional data for its addresses. */ | |
1594 | ||
1595 | (void)dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, | |
1596 | (DN_EXPAND_ARG4_TYPE)target, sizeof(target)); | |
1597 | ||
1598 | DEBUG(D_acl) debug_printf("CSA target is %s\n", target); | |
1599 | ||
1600 | break; | |
1601 | } | |
1602 | ||
1603 | /* If we didn't break the loop then no appropriate records were found. */ | |
1604 | ||
1605 | if (rr == NULL) return t->data.val = CSA_UNKNOWN; | |
1606 | ||
1607 | /* Do not check addresses if the target is ".", in accordance with RFC 2782. | |
1608 | A target of "." indicates there are no valid addresses, so the client cannot | |
1609 | be authorized. (This is an odd configuration because weight=2 target=. is | |
1610 | equivalent to weight=1, but we check for it in order to keep load off the | |
1611 | root name servers.) Note that dn_expand() turns "." into "". */ | |
1612 | ||
1613 | if (Ustrcmp(target, "") == 0) return t->data.val = CSA_FAIL_NOADDR; | |
1614 | ||
1615 | /* Scan the additional section of the CSA SRV reply for addresses belonging | |
1616 | to the target. If the name server didn't return any additional data (e.g. | |
1617 | because it does not fully support SRV records), we need to do another lookup | |
1618 | to obtain the target addresses; otherwise we have a definitive result. */ | |
1619 | ||
1620 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ADDITIONAL, target); | |
1621 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1622 | ||
1623 | /* The DNS lookup type corresponds to the IP version used by the client. */ | |
1624 | ||
1625 | #if HAVE_IPV6 | |
1626 | if (Ustrchr(sender_host_address, ':') != NULL) | |
1627 | type = T_AAAA; | |
1628 | else | |
1629 | #endif /* HAVE_IPV6 */ | |
1630 | type = T_A; | |
1631 | ||
1632 | ||
4e0983dc | 1633 | lookup_dnssec_authenticated = NULL; |
e5a9dba6 PH |
1634 | switch (dns_lookup(&dnsa, target, type, NULL)) |
1635 | { | |
1636 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1637 | ||
1638 | default: | |
cc00f4af | 1639 | return t->data.val = CSA_DEFER_ADDR; |
e5a9dba6 PH |
1640 | |
1641 | /* If the query succeeded, scan the addresses and return the result. */ | |
1642 | ||
1643 | case DNS_SUCCEED: | |
cc00f4af JH |
1644 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ANSWERS, target); |
1645 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1646 | /* else fall through */ | |
e5a9dba6 PH |
1647 | |
1648 | /* If the target has no IP addresses, the client cannot have an authorized | |
1649 | IP address. However, if the target site uses A6 records (not AAAA records) | |
1650 | we have to do yet another lookup in order to check them. */ | |
1651 | ||
1652 | case DNS_NOMATCH: | |
1653 | case DNS_NODATA: | |
cc00f4af | 1654 | return t->data.val = CSA_FAIL_NOADDR; |
e5a9dba6 PH |
1655 | } |
1656 | } | |
1657 | ||
1658 | ||
1659 | ||
059ec3d9 PH |
1660 | /************************************************* |
1661 | * Handle verification (address & other) * | |
1662 | *************************************************/ | |
1663 | ||
89583014 | 1664 | enum { VERIFY_REV_HOST_LKUP, VERIFY_CERT, VERIFY_HELO, VERIFY_CSA, VERIFY_HDR_SYNTAX, |
770747fd MFM |
1665 | VERIFY_NOT_BLIND, VERIFY_HDR_SNDR, VERIFY_SNDR, VERIFY_RCPT, |
1666 | VERIFY_HDR_NAMES_ASCII | |
89583014 JH |
1667 | }; |
1668 | typedef struct { | |
1669 | uschar * name; | |
1670 | int value; | |
1671 | unsigned where_allowed; /* bitmap */ | |
1672 | BOOL no_options; /* Never has /option(s) following */ | |
1673 | unsigned alt_opt_sep; /* >0 Non-/ option separator (custom parser) */ | |
1674 | } verify_type_t; | |
1675 | static verify_type_t verify_type_list[] = { | |
7e8360e6 | 1676 | { US"reverse_host_lookup", VERIFY_REV_HOST_LKUP, ~0, FALSE, 0 }, |
89583014 JH |
1677 | { US"certificate", VERIFY_CERT, ~0, TRUE, 0 }, |
1678 | { US"helo", VERIFY_HELO, ~0, TRUE, 0 }, | |
1679 | { US"csa", VERIFY_CSA, ~0, FALSE, 0 }, | |
1680 | { US"header_syntax", VERIFY_HDR_SYNTAX, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), TRUE, 0 }, | |
1681 | { US"not_blind", VERIFY_NOT_BLIND, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), TRUE, 0 }, | |
1682 | { US"header_sender", VERIFY_HDR_SNDR, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), FALSE, 0 }, | |
1683 | { US"sender", VERIFY_SNDR, (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT) | |
1684 | |(1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), | |
1685 | FALSE, 6 }, | |
770747fd MFM |
1686 | { US"recipient", VERIFY_RCPT, (1<<ACL_WHERE_RCPT), FALSE, 0 }, |
1687 | { US"header_names_ascii", VERIFY_HDR_NAMES_ASCII, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), TRUE, 0 } | |
89583014 JH |
1688 | }; |
1689 | ||
1690 | ||
1691 | enum { CALLOUT_DEFER_OK, CALLOUT_NOCACHE, CALLOUT_RANDOM, CALLOUT_USE_SENDER, | |
1692 | CALLOUT_USE_POSTMASTER, CALLOUT_POSTMASTER, CALLOUT_FULLPOSTMASTER, | |
1693 | CALLOUT_MAILFROM, CALLOUT_POSTMASTER_MAILFROM, CALLOUT_MAXWAIT, CALLOUT_CONNECT, | |
1694 | CALLOUT_TIME | |
1695 | }; | |
1696 | typedef struct { | |
1697 | uschar * name; | |
1698 | int value; | |
1699 | int flag; | |
1700 | BOOL has_option; /* Has =option(s) following */ | |
1701 | BOOL timeval; /* Has a time value */ | |
1702 | } callout_opt_t; | |
1703 | static callout_opt_t callout_opt_list[] = { | |
1704 | { US"defer_ok", CALLOUT_DEFER_OK, 0, FALSE, FALSE }, | |
1705 | { US"no_cache", CALLOUT_NOCACHE, vopt_callout_no_cache, FALSE, FALSE }, | |
1706 | { US"random", CALLOUT_RANDOM, vopt_callout_random, FALSE, FALSE }, | |
1707 | { US"use_sender", CALLOUT_USE_SENDER, vopt_callout_recipsender, FALSE, FALSE }, | |
1708 | { US"use_postmaster", CALLOUT_USE_POSTMASTER,vopt_callout_recippmaster, FALSE, FALSE }, | |
1709 | { US"postmaster_mailfrom",CALLOUT_POSTMASTER_MAILFROM,0, TRUE, FALSE }, | |
1710 | { US"postmaster", CALLOUT_POSTMASTER, 0, FALSE, FALSE }, | |
1711 | { US"fullpostmaster", CALLOUT_FULLPOSTMASTER,vopt_callout_fullpm, FALSE, FALSE }, | |
1712 | { US"mailfrom", CALLOUT_MAILFROM, 0, TRUE, FALSE }, | |
1713 | { US"maxwait", CALLOUT_MAXWAIT, 0, TRUE, TRUE }, | |
1714 | { US"connect", CALLOUT_CONNECT, 0, TRUE, TRUE }, | |
1715 | { NULL, CALLOUT_TIME, 0, FALSE, TRUE } | |
1716 | }; | |
1717 | ||
1718 | ||
1719 | ||
059ec3d9 PH |
1720 | /* This function implements the "verify" condition. It is called when |
1721 | encountered in any ACL, because some tests are almost always permitted. Some | |
1722 | just don't make sense, and always fail (for example, an attempt to test a host | |
1723 | lookup for a non-TCP/IP message). Others are restricted to certain ACLs. | |
1724 | ||
1725 | Arguments: | |
1726 | where where called from | |
1727 | addr the recipient address that the ACL is handling, or NULL | |
1728 | arg the argument of "verify" | |
1729 | user_msgptr pointer for user message | |
1730 | log_msgptr pointer for log message | |
1731 | basic_errno where to put verify errno | |
1732 | ||
1733 | Returns: OK verification condition succeeded | |
1734 | FAIL verification failed | |
1735 | DEFER there was a problem verifying | |
1736 | ERROR syntax error | |
1737 | */ | |
1738 | ||
1739 | static int | |
55414b25 | 1740 | acl_verify(int where, address_item *addr, const uschar *arg, |
059ec3d9 PH |
1741 | uschar **user_msgptr, uschar **log_msgptr, int *basic_errno) |
1742 | { | |
1743 | int sep = '/'; | |
1744 | int callout = -1; | |
1745 | int callout_overall = -1; | |
4deaf07d | 1746 | int callout_connect = -1; |
059ec3d9 PH |
1747 | int verify_options = 0; |
1748 | int rc; | |
1749 | BOOL verify_header_sender = FALSE; | |
1750 | BOOL defer_ok = FALSE; | |
1751 | BOOL callout_defer_ok = FALSE; | |
1752 | BOOL no_details = FALSE; | |
eafd343b | 1753 | BOOL success_on_redirect = FALSE; |
059ec3d9 PH |
1754 | address_item *sender_vaddr = NULL; |
1755 | uschar *verify_sender_address = NULL; | |
1756 | uschar *pm_mailfrom = NULL; | |
1757 | uschar *se_mailfrom = NULL; | |
596875b3 PH |
1758 | |
1759 | /* Some of the verify items have slash-separated options; some do not. Diagnose | |
89583014 | 1760 | an error if options are given for items that don't expect them. |
596875b3 PH |
1761 | */ |
1762 | ||
1763 | uschar *slash = Ustrchr(arg, '/'); | |
55414b25 | 1764 | const uschar *list = arg; |
059ec3d9 | 1765 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); |
89583014 | 1766 | verify_type_t * vp; |
059ec3d9 PH |
1767 | |
1768 | if (ss == NULL) goto BAD_VERIFY; | |
1769 | ||
1770 | /* Handle name/address consistency verification in a separate function. */ | |
1771 | ||
89583014 JH |
1772 | for (vp= verify_type_list; |
1773 | (char *)vp < (char *)verify_type_list + sizeof(verify_type_list); | |
1774 | vp++ | |
1775 | ) | |
1776 | if (vp->alt_opt_sep ? strncmpic(ss, vp->name, vp->alt_opt_sep) == 0 | |
1777 | : strcmpic (ss, vp->name) == 0) | |
1778 | break; | |
1779 | if ((char *)vp >= (char *)verify_type_list + sizeof(verify_type_list)) | |
1780 | goto BAD_VERIFY; | |
1781 | ||
1782 | if (vp->no_options && slash != NULL) | |
059ec3d9 | 1783 | { |
89583014 JH |
1784 | *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" " |
1785 | "(this verify item has no options)", arg); | |
1786 | return ERROR; | |
059ec3d9 | 1787 | } |
89583014 | 1788 | if (!(vp->where_allowed & (1<<where))) |
059ec3d9 | 1789 | { |
89583014 JH |
1790 | *log_msgptr = string_sprintf("cannot verify %s in ACL for %s", vp->name, acl_wherenames[where]); |
1791 | return ERROR; | |
059ec3d9 | 1792 | } |
89583014 | 1793 | switch(vp->value) |
596875b3 | 1794 | { |
89583014 JH |
1795 | case VERIFY_REV_HOST_LKUP: |
1796 | if (sender_host_address == NULL) return OK; | |
7e8360e6 JH |
1797 | if ((rc = acl_verify_reverse(user_msgptr, log_msgptr)) == DEFER) |
1798 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) | |
1799 | if (strcmpic(ss, US"defer_ok") == 0) | |
1800 | return OK; | |
1801 | return rc; | |
059ec3d9 | 1802 | |
89583014 JH |
1803 | case VERIFY_CERT: |
1804 | /* TLS certificate verification is done at STARTTLS time; here we just | |
1805 | test whether it was successful or not. (This is for optional verification; for | |
1806 | mandatory verification, the connection doesn't last this long.) */ | |
e5a9dba6 | 1807 | |
3703d818 JH |
1808 | if (tls_in.certificate_verified) return OK; |
1809 | *user_msgptr = US"no verified certificate"; | |
1810 | return FAIL; | |
e5a9dba6 | 1811 | |
89583014 JH |
1812 | case VERIFY_HELO: |
1813 | /* We can test the result of optional HELO verification that might have | |
1814 | occurred earlier. If not, we can attempt the verification now. */ | |
059ec3d9 | 1815 | |
3703d818 JH |
1816 | if (!helo_verified && !helo_verify_failed) smtp_verify_helo(); |
1817 | return helo_verified? OK : FAIL; | |
059ec3d9 | 1818 | |
89583014 JH |
1819 | case VERIFY_CSA: |
1820 | /* Do Client SMTP Authorization checks in a separate function, and turn the | |
1821 | result code into user-friendly strings. */ | |
1c41c9cc | 1822 | |
3703d818 JH |
1823 | rc = acl_verify_csa(list); |
1824 | *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s", | |
89583014 | 1825 | csa_reason_string[rc]); |
3703d818 JH |
1826 | csa_status = csa_status_string[rc]; |
1827 | DEBUG(D_acl) debug_printf("CSA result %s\n", csa_status); | |
1828 | return csa_return_code[rc]; | |
89583014 JH |
1829 | |
1830 | case VERIFY_HDR_SYNTAX: | |
1831 | /* Check that all relevant header lines have the correct syntax. If there is | |
1832 | a syntax error, we return details of the error to the sender if configured to | |
1833 | send out full details. (But a "message" setting on the ACL can override, as | |
1834 | always). */ | |
1835 | ||
1836 | rc = verify_check_headers(log_msgptr); | |
3703d818 JH |
1837 | if (rc != OK && *log_msgptr) |
1838 | if (smtp_return_error_details) | |
1839 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1840 | else | |
1841 | acl_verify_message = *log_msgptr; | |
89583014 | 1842 | return rc; |
059ec3d9 | 1843 | |
770747fd MFM |
1844 | case VERIFY_HDR_NAMES_ASCII: |
1845 | /* Check that all header names are true 7 bit strings | |
1846 | See RFC 5322, 2.2. and RFC 6532, 3. */ | |
1847 | ||
1848 | rc = verify_check_header_names_ascii(log_msgptr); | |
1849 | if (rc != OK && smtp_return_error_details && *log_msgptr != NULL) | |
1850 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1851 | return rc; | |
1852 | ||
89583014 JH |
1853 | case VERIFY_NOT_BLIND: |
1854 | /* Check that no recipient of this message is "blind", that is, every envelope | |
1855 | recipient must be mentioned in either To: or Cc:. */ | |
059ec3d9 | 1856 | |
89583014 JH |
1857 | rc = verify_check_notblind(); |
1858 | if (rc != OK) | |
1859 | { | |
1860 | *log_msgptr = string_sprintf("bcc recipient detected"); | |
1861 | if (smtp_return_error_details) | |
1862 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1863 | } | |
1864 | return rc; | |
059ec3d9 | 1865 | |
89583014 JH |
1866 | /* The remaining verification tests check recipient and sender addresses, |
1867 | either from the envelope or from the header. There are a number of | |
1868 | slash-separated options that are common to all of them. */ | |
059ec3d9 | 1869 | |
89583014 JH |
1870 | case VERIFY_HDR_SNDR: |
1871 | verify_header_sender = TRUE; | |
1872 | break; | |
059ec3d9 | 1873 | |
89583014 JH |
1874 | case VERIFY_SNDR: |
1875 | /* In the case of a sender, this can optionally be followed by an address to use | |
1876 | in place of the actual sender (rare special-case requirement). */ | |
059ec3d9 | 1877 | { |
89583014 JH |
1878 | uschar *s = ss + 6; |
1879 | if (*s == 0) | |
1880 | verify_sender_address = sender_address; | |
1881 | else | |
1882 | { | |
1883 | while (isspace(*s)) s++; | |
1884 | if (*s++ != '=') goto BAD_VERIFY; | |
1885 | while (isspace(*s)) s++; | |
1886 | verify_sender_address = string_copy(s); | |
1887 | } | |
059ec3d9 | 1888 | } |
89583014 JH |
1889 | break; |
1890 | ||
1891 | case VERIFY_RCPT: | |
1892 | break; | |
059ec3d9 PH |
1893 | } |
1894 | ||
89583014 JH |
1895 | |
1896 | ||
596875b3 PH |
1897 | /* Remaining items are optional; they apply to sender and recipient |
1898 | verification, including "header sender" verification. */ | |
059ec3d9 PH |
1899 | |
1900 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) | |
1901 | != NULL) | |
1902 | { | |
1903 | if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE; | |
1904 | else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE; | |
eafd343b | 1905 | else if (strcmpic(ss, US"success_on_redirect") == 0) success_on_redirect = TRUE; |
059ec3d9 PH |
1906 | |
1907 | /* These two old options are left for backwards compatibility */ | |
1908 | ||
1909 | else if (strcmpic(ss, US"callout_defer_ok") == 0) | |
1910 | { | |
1911 | callout_defer_ok = TRUE; | |
1912 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1913 | } | |
1914 | ||
1915 | else if (strcmpic(ss, US"check_postmaster") == 0) | |
1916 | { | |
1917 | pm_mailfrom = US""; | |
1918 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1919 | } | |
1920 | ||
1921 | /* The callout option has a number of sub-options, comma separated */ | |
1922 | ||
1923 | else if (strncmpic(ss, US"callout", 7) == 0) | |
1924 | { | |
1925 | callout = CALLOUT_TIMEOUT_DEFAULT; | |
1926 | ss += 7; | |
1927 | if (*ss != 0) | |
1928 | { | |
1929 | while (isspace(*ss)) ss++; | |
1930 | if (*ss++ == '=') | |
1931 | { | |
55414b25 | 1932 | const uschar * sublist = ss; |
059ec3d9 PH |
1933 | int optsep = ','; |
1934 | uschar *opt; | |
1935 | uschar buffer[256]; | |
55414b25 | 1936 | while (isspace(*sublist)) sublist++; |
8e669ac1 | 1937 | |
55414b25 | 1938 | while ((opt = string_nextinlist(&sublist, &optsep, buffer, sizeof(buffer))) |
059ec3d9 PH |
1939 | != NULL) |
1940 | { | |
89583014 | 1941 | callout_opt_t * op; |
438257ba | 1942 | double period = 1.0F; |
059ec3d9 | 1943 | |
89583014 | 1944 | for (op= callout_opt_list; op->name; op++) |
438257ba | 1945 | if (strncmpic(opt, op->name, Ustrlen(op->name)) == 0) |
89583014 | 1946 | break; |
059ec3d9 | 1947 | |
89583014 JH |
1948 | verify_options |= op->flag; |
1949 | if (op->has_option) | |
1950 | { | |
438257ba | 1951 | opt += Ustrlen(op->name); |
4deaf07d PH |
1952 | while (isspace(*opt)) opt++; |
1953 | if (*opt++ != '=') | |
1954 | { | |
1955 | *log_msgptr = string_sprintf("'=' expected after " | |
89583014 | 1956 | "\"%s\" in ACL verify condition \"%s\"", op->name, arg); |
4deaf07d PH |
1957 | return ERROR; |
1958 | } | |
1959 | while (isspace(*opt)) opt++; | |
89583014 JH |
1960 | } |
1961 | if (op->timeval) | |
1962 | { | |
1963 | period = readconf_readtime(opt, 0, FALSE); | |
1964 | if (period < 0) | |
4deaf07d PH |
1965 | { |
1966 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1967 | "\"verify %s\"", arg); | |
1968 | return ERROR; | |
1969 | } | |
89583014 JH |
1970 | } |
1971 | ||
1972 | switch(op->value) | |
1973 | { | |
1974 | case CALLOUT_DEFER_OK: callout_defer_ok = TRUE; break; | |
1975 | case CALLOUT_POSTMASTER: pm_mailfrom = US""; break; | |
1976 | case CALLOUT_FULLPOSTMASTER: pm_mailfrom = US""; break; | |
1977 | case CALLOUT_MAILFROM: | |
1978 | if (!verify_header_sender) | |
1979 | { | |
1980 | *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a " | |
1981 | "callout option only for verify=header_sender (detected in ACL " | |
1982 | "condition \"%s\")", arg); | |
1983 | return ERROR; | |
1984 | } | |
1985 | se_mailfrom = string_copy(opt); | |
1986 | break; | |
1987 | case CALLOUT_POSTMASTER_MAILFROM: pm_mailfrom = string_copy(opt); break; | |
1988 | case CALLOUT_MAXWAIT: callout_overall = period; break; | |
1989 | case CALLOUT_CONNECT: callout_connect = period; break; | |
1990 | case CALLOUT_TIME: callout = period; break; | |
1991 | } | |
059ec3d9 PH |
1992 | } |
1993 | } | |
1994 | else | |
1995 | { | |
1996 | *log_msgptr = string_sprintf("'=' expected after \"callout\" in " | |
1997 | "ACL condition \"%s\"", arg); | |
1998 | return ERROR; | |
1999 | } | |
2000 | } | |
2001 | } | |
2002 | ||
2003 | /* Option not recognized */ | |
2004 | ||
2005 | else | |
2006 | { | |
2007 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " | |
2008 | "condition \"verify %s\"", ss, arg); | |
2009 | return ERROR; | |
2010 | } | |
2011 | } | |
2012 | ||
2013 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == | |
2014 | (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
2015 | { | |
2016 | *log_msgptr = US"only one of use_sender and use_postmaster can be set " | |
2017 | "for a recipient callout"; | |
2018 | return ERROR; | |
2019 | } | |
2020 | ||
2021 | /* Handle sender-in-header verification. Default the user message to the log | |
2022 | message if giving out verification details. */ | |
2023 | ||
2024 | if (verify_header_sender) | |
2025 | { | |
8e669ac1 | 2026 | int verrno; |
059ec3d9 | 2027 | rc = verify_check_header_address(user_msgptr, log_msgptr, callout, |
fe5b5d0b PH |
2028 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, verify_options, |
2029 | &verrno); | |
2030 | if (rc != OK) | |
8e669ac1 | 2031 | { |
fe5b5d0b PH |
2032 | *basic_errno = verrno; |
2033 | if (smtp_return_error_details) | |
2034 | { | |
2035 | if (*user_msgptr == NULL && *log_msgptr != NULL) | |
2036 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
2037 | if (rc == DEFER) acl_temp_details = TRUE; | |
2038 | } | |
8e669ac1 | 2039 | } |
059ec3d9 PH |
2040 | } |
2041 | ||
2042 | /* Handle a sender address. The default is to verify *the* sender address, but | |
2043 | optionally a different address can be given, for special requirements. If the | |
2044 | address is empty, we are dealing with a bounce message that has no sender, so | |
2045 | we cannot do any checking. If the real sender address gets rewritten during | |
2046 | verification (e.g. DNS widening), set the flag to stop it being rewritten again | |
2047 | during message reception. | |
2048 | ||
2049 | A list of verified "sender" addresses is kept to try to avoid doing to much | |
2050 | work repetitively when there are multiple recipients in a message and they all | |
2051 | require sender verification. However, when callouts are involved, it gets too | |
2052 | complicated because different recipients may require different callout options. | |
2053 | Therefore, we always do a full sender verify when any kind of callout is | |
2054 | specified. Caching elsewhere, for instance in the DNS resolver and in the | |
2055 | callout handling, should ensure that this is not terribly inefficient. */ | |
2056 | ||
2057 | else if (verify_sender_address != NULL) | |
2058 | { | |
2059 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
2060 | != 0) | |
2061 | { | |
2062 | *log_msgptr = US"use_sender or use_postmaster cannot be used for a " | |
2063 | "sender verify callout"; | |
2064 | return ERROR; | |
2065 | } | |
2066 | ||
2067 | sender_vaddr = verify_checked_sender(verify_sender_address); | |
2068 | if (sender_vaddr != NULL && /* Previously checked */ | |
2069 | callout <= 0) /* No callout needed this time */ | |
2070 | { | |
2071 | /* If the "routed" flag is set, it means that routing worked before, so | |
2072 | this check can give OK (the saved return code value, if set, belongs to a | |
2073 | callout that was done previously). If the "routed" flag is not set, routing | |
2074 | must have failed, so we use the saved return code. */ | |
2075 | ||
2076 | if (testflag(sender_vaddr, af_verify_routed)) rc = OK; else | |
2077 | { | |
2078 | rc = sender_vaddr->special_action; | |
2079 | *basic_errno = sender_vaddr->basic_errno; | |
2080 | } | |
2081 | HDEBUG(D_acl) debug_printf("using cached sender verify result\n"); | |
2082 | } | |
2083 | ||
2084 | /* Do a new verification, and cache the result. The cache is used to avoid | |
2085 | verifying the sender multiple times for multiple RCPTs when callouts are not | |
2086 | specified (see comments above). | |
2087 | ||
2088 | The cache is also used on failure to give details in response to the first | |
2089 | RCPT that gets bounced for this reason. However, this can be suppressed by | |
2090 | the no_details option, which sets the flag that says "this detail has already | |
2091 | been sent". The cache normally contains just one address, but there may be | |
2092 | more in esoteric circumstances. */ | |
2093 | ||
2094 | else | |
2095 | { | |
2096 | BOOL routed = TRUE; | |
2a3eea10 | 2097 | uschar *save_address_data = deliver_address_data; |
8e669ac1 | 2098 | |
059ec3d9 | 2099 | sender_vaddr = deliver_make_addr(verify_sender_address, TRUE); |
8c5d388a | 2100 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
2101 | if ((sender_vaddr->prop.utf8_msg = message_smtputf8)) |
2102 | { | |
2103 | sender_vaddr->prop.utf8_downcvt = message_utf8_downconvert == 1; | |
2104 | sender_vaddr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1; | |
2105 | } | |
f358d5e0 | 2106 | #endif |
059ec3d9 PH |
2107 | if (no_details) setflag(sender_vaddr, af_sverify_told); |
2108 | if (verify_sender_address[0] != 0) | |
2109 | { | |
2110 | /* If this is the real sender address, save the unrewritten version | |
2111 | for use later in receive. Otherwise, set a flag so that rewriting the | |
2112 | sender in verify_address() does not update sender_address. */ | |
2113 | ||
2114 | if (verify_sender_address == sender_address) | |
2115 | sender_address_unrewritten = sender_address; | |
2116 | else | |
2117 | verify_options |= vopt_fake_sender; | |
2118 | ||
eafd343b TK |
2119 | if (success_on_redirect) |
2120 | verify_options |= vopt_success_on_redirect; | |
2121 | ||
059ec3d9 PH |
2122 | /* The recipient, qualify, and expn options are never set in |
2123 | verify_options. */ | |
2124 | ||
2125 | rc = verify_address(sender_vaddr, NULL, verify_options, callout, | |
4deaf07d | 2126 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, &routed); |
059ec3d9 PH |
2127 | |
2128 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); | |
2129 | ||
2130 | if (rc == OK) | |
2131 | { | |
2132 | if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0) | |
2133 | { | |
2134 | DEBUG(D_acl) debug_printf("sender %s verified ok as %s\n", | |
2135 | verify_sender_address, sender_vaddr->address); | |
2136 | } | |
2137 | else | |
2138 | { | |
2139 | DEBUG(D_acl) debug_printf("sender %s verified ok\n", | |
2140 | verify_sender_address); | |
2141 | } | |
2142 | } | |
2143 | else *basic_errno = sender_vaddr->basic_errno; | |
2144 | } | |
2145 | else rc = OK; /* Null sender */ | |
2146 | ||
2147 | /* Cache the result code */ | |
2148 | ||
2149 | if (routed) setflag(sender_vaddr, af_verify_routed); | |
2150 | if (callout > 0) setflag(sender_vaddr, af_verify_callout); | |
2151 | sender_vaddr->special_action = rc; | |
2152 | sender_vaddr->next = sender_verified_list; | |
2153 | sender_verified_list = sender_vaddr; | |
8e669ac1 PH |
2154 | |
2155 | /* Restore the recipient address data, which might have been clobbered by | |
2a3eea10 | 2156 | the sender verification. */ |
8e669ac1 | 2157 | |
2a3eea10 | 2158 | deliver_address_data = save_address_data; |
059ec3d9 | 2159 | } |
8e669ac1 | 2160 | |
2a3eea10 PH |
2161 | /* Put the sender address_data value into $sender_address_data */ |
2162 | ||
d43cbe25 | 2163 | sender_address_data = sender_vaddr->prop.address_data; |
059ec3d9 PH |
2164 | } |
2165 | ||
2166 | /* A recipient address just gets a straightforward verify; again we must handle | |
2167 | the DEFER overrides. */ | |
2168 | ||
2169 | else | |
2170 | { | |
2171 | address_item addr2; | |
2172 | ||
eafd343b TK |
2173 | if (success_on_redirect) |
2174 | verify_options |= vopt_success_on_redirect; | |
2175 | ||
059ec3d9 PH |
2176 | /* We must use a copy of the address for verification, because it might |
2177 | get rewritten. */ | |
2178 | ||
2179 | addr2 = *addr; | |
2180 | rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout, | |
4deaf07d | 2181 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, NULL); |
059ec3d9 | 2182 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); |
8e669ac1 | 2183 | |
42855d71 | 2184 | *basic_errno = addr2.basic_errno; |
059ec3d9 | 2185 | *log_msgptr = addr2.message; |
8e669ac1 | 2186 | *user_msgptr = (addr2.user_message != NULL)? |
6729cf78 | 2187 | addr2.user_message : addr2.message; |
42855d71 PH |
2188 | |
2189 | /* Allow details for temporary error if the address is so flagged. */ | |
2190 | if (testflag((&addr2), af_pass_message)) acl_temp_details = TRUE; | |
059ec3d9 PH |
2191 | |
2192 | /* Make $address_data visible */ | |
d43cbe25 | 2193 | deliver_address_data = addr2.prop.address_data; |
059ec3d9 PH |
2194 | } |
2195 | ||
2196 | /* We have a result from the relevant test. Handle defer overrides first. */ | |
2197 | ||
2198 | if (rc == DEFER && (defer_ok || | |
2199 | (callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER))) | |
2200 | { | |
2201 | HDEBUG(D_acl) debug_printf("verify defer overridden by %s\n", | |
2202 | defer_ok? "defer_ok" : "callout_defer_ok"); | |
2203 | rc = OK; | |
2204 | } | |
2205 | ||
2206 | /* If we've failed a sender, set up a recipient message, and point | |
2207 | sender_verified_failed to the address item that actually failed. */ | |
2208 | ||
2209 | if (rc != OK && verify_sender_address != NULL) | |
2210 | { | |
2211 | if (rc != DEFER) | |
059ec3d9 | 2212 | *log_msgptr = *user_msgptr = US"Sender verify failed"; |
059ec3d9 | 2213 | else if (*basic_errno != ERRNO_CALLOUTDEFER) |
059ec3d9 | 2214 | *log_msgptr = *user_msgptr = US"Could not complete sender verify"; |
059ec3d9 PH |
2215 | else |
2216 | { | |
2217 | *log_msgptr = US"Could not complete sender verify callout"; | |
2218 | *user_msgptr = smtp_return_error_details? sender_vaddr->user_message : | |
2219 | *log_msgptr; | |
2220 | } | |
2221 | ||
2222 | sender_verified_failed = sender_vaddr; | |
2223 | } | |
2224 | ||
2225 | /* Verifying an address messes up the values of $domain and $local_part, | |
2226 | so reset them before returning if this is a RCPT ACL. */ | |
2227 | ||
2228 | if (addr != NULL) | |
2229 | { | |
2230 | deliver_domain = addr->domain; | |
2231 | deliver_localpart = addr->local_part; | |
2232 | } | |
2233 | return rc; | |
2234 | ||
2235 | /* Syntax errors in the verify argument come here. */ | |
2236 | ||
2237 | BAD_VERIFY: | |
2238 | *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", " | |
770747fd MFM |
2239 | "\"helo\", \"header_syntax\", \"header_sender\", \"header_names_ascii\" " |
2240 | "or \"reverse_host_lookup\" at start of ACL condition " | |
059ec3d9 PH |
2241 | "\"verify %s\"", arg); |
2242 | return ERROR; | |
2243 | } | |
2244 | ||
2245 | ||
2246 | ||
2247 | ||
2248 | /************************************************* | |
2249 | * Check argument for control= modifier * | |
2250 | *************************************************/ | |
2251 | ||
2252 | /* Called from acl_check_condition() below | |
2253 | ||
2254 | Arguments: | |
2255 | arg the argument string for control= | |
2256 | pptr set to point to the terminating character | |
2257 | where which ACL we are in | |
2258 | log_msgptr for error messages | |
2259 | ||
2260 | Returns: CONTROL_xxx value | |
2261 | */ | |
2262 | ||
2263 | static int | |
55414b25 | 2264 | decode_control(const uschar *arg, const uschar **pptr, int where, uschar **log_msgptr) |
059ec3d9 PH |
2265 | { |
2266 | int len; | |
2267 | control_def *d; | |
2268 | ||
2269 | for (d = controls_list; | |
2270 | d < controls_list + sizeof(controls_list)/sizeof(control_def); | |
2271 | d++) | |
2272 | { | |
2273 | len = Ustrlen(d->name); | |
2274 | if (Ustrncmp(d->name, arg, len) == 0) break; | |
2275 | } | |
2276 | ||
2277 | if (d >= controls_list + sizeof(controls_list)/sizeof(control_def) || | |
2278 | (arg[len] != 0 && (!d->has_option || arg[len] != '/'))) | |
2279 | { | |
2280 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2281 | return CONTROL_ERROR; | |
2282 | } | |
2283 | ||
059ec3d9 PH |
2284 | *pptr = arg + len; |
2285 | return d->value; | |
2286 | } | |
2287 | ||
2288 | ||
2289 | ||
c99ce5c9 TF |
2290 | |
2291 | /************************************************* | |
2292 | * Return a ratelimit error * | |
2293 | *************************************************/ | |
2294 | ||
2295 | /* Called from acl_ratelimit() below | |
2296 | ||
2297 | Arguments: | |
2298 | log_msgptr for error messages | |
2299 | format format string | |
2300 | ... supplementary arguments | |
2301 | ss ratelimit option name | |
2302 | where ACL_WHERE_xxxx indicating which ACL this is | |
2303 | ||
2304 | Returns: ERROR | |
2305 | */ | |
2306 | ||
2307 | static int | |
2308 | ratelimit_error(uschar **log_msgptr, const char *format, ...) | |
2309 | { | |
2310 | va_list ap; | |
2311 | uschar buffer[STRING_SPRINTF_BUFFER_SIZE]; | |
2312 | va_start(ap, format); | |
2313 | if (!string_vformat(buffer, sizeof(buffer), format, ap)) | |
2314 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
ef840681 | 2315 | "string_sprintf expansion was longer than " SIZE_T_FMT, sizeof(buffer)); |
c99ce5c9 TF |
2316 | va_end(ap); |
2317 | *log_msgptr = string_sprintf( | |
2318 | "error in arguments to \"ratelimit\" condition: %s", buffer); | |
2319 | return ERROR; | |
2320 | } | |
2321 | ||
2322 | ||
2323 | ||
2324 | ||
870f6ba8 TF |
2325 | /************************************************* |
2326 | * Handle rate limiting * | |
2327 | *************************************************/ | |
2328 | ||
2329 | /* Called by acl_check_condition() below to calculate the result | |
2330 | of the ACL ratelimit condition. | |
2331 | ||
2332 | Note that the return value might be slightly unexpected: if the | |
2333 | sender's rate is above the limit then the result is OK. This is | |
2334 | similar to the dnslists condition, and is so that you can write | |
2335 | ACL clauses like: defer ratelimit = 15 / 1h | |
2336 | ||
2337 | Arguments: | |
2338 | arg the option string for ratelimit= | |
90fc3069 | 2339 | where ACL_WHERE_xxxx indicating which ACL this is |
870f6ba8 TF |
2340 | log_msgptr for error messages |
2341 | ||
2342 | Returns: OK - Sender's rate is above limit | |
2343 | FAIL - Sender's rate is below limit | |
2344 | DEFER - Problem opening ratelimit database | |
2345 | ERROR - Syntax error in options. | |
2346 | */ | |
2347 | ||
2348 | static int | |
55414b25 | 2349 | acl_ratelimit(const uschar *arg, int where, uschar **log_msgptr) |
870f6ba8 | 2350 | { |
c99ce5c9 | 2351 | double limit, period, count; |
8f240103 PH |
2352 | uschar *ss; |
2353 | uschar *key = NULL; | |
c99ce5c9 | 2354 | uschar *unique = NULL; |
870f6ba8 | 2355 | int sep = '/'; |
c99ce5c9 TF |
2356 | BOOL leaky = FALSE, strict = FALSE, readonly = FALSE; |
2357 | BOOL noupdate = FALSE, badacl = FALSE; | |
2358 | int mode = RATE_PER_WHAT; | |
870f6ba8 TF |
2359 | int old_pool, rc; |
2360 | tree_node **anchor, *t; | |
2361 | open_db dbblock, *dbm; | |
c99ce5c9 | 2362 | int dbdb_size; |
870f6ba8 | 2363 | dbdata_ratelimit *dbd; |
c99ce5c9 | 2364 | dbdata_ratelimit_unique *dbdb; |
870f6ba8 TF |
2365 | struct timeval tv; |
2366 | ||
2367 | /* Parse the first two options and record their values in expansion | |
2368 | variables. These variables allow the configuration to have informative | |
2369 | error messages based on rate limits obtained from a table lookup. */ | |
2370 | ||
c99ce5c9 | 2371 | /* First is the maximum number of messages per period / maximum burst |
870f6ba8 TF |
2372 | size, which must be greater than or equal to zero. Zero is useful for |
2373 | rate measurement as opposed to rate limiting. */ | |
2374 | ||
2375 | sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0); | |
2376 | if (sender_rate_limit == NULL) | |
288644dd | 2377 | { |
870f6ba8 | 2378 | limit = -1.0; |
288644dd JH |
2379 | ss = NULL; /* compiler quietening */ |
2380 | } | |
870f6ba8 TF |
2381 | else |
2382 | { | |
2383 | limit = Ustrtod(sender_rate_limit, &ss); | |
2384 | if (tolower(*ss) == 'k') { limit *= 1024.0; ss++; } | |
2385 | else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; } | |
2386 | else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; } | |
2387 | } | |
c99ce5c9 TF |
2388 | if (limit < 0.0 || *ss != '\0') |
2389 | return ratelimit_error(log_msgptr, | |
2390 | "\"%s\" is not a positive number", sender_rate_limit); | |
870f6ba8 | 2391 | |
c99ce5c9 | 2392 | /* Second is the rate measurement period / exponential smoothing time |
870f6ba8 TF |
2393 | constant. This must be strictly greater than zero, because zero leads to |
2394 | run-time division errors. */ | |
2395 | ||
2396 | sender_rate_period = string_nextinlist(&arg, &sep, NULL, 0); | |
2397 | if (sender_rate_period == NULL) period = -1.0; | |
2398 | else period = readconf_readtime(sender_rate_period, 0, FALSE); | |
2399 | if (period <= 0.0) | |
c99ce5c9 TF |
2400 | return ratelimit_error(log_msgptr, |
2401 | "\"%s\" is not a time value", sender_rate_period); | |
2402 | ||
2403 | /* By default we are counting one of something, but the per_rcpt, | |
2404 | per_byte, and count options can change this. */ | |
2405 | ||
2406 | count = 1.0; | |
870f6ba8 | 2407 | |
c99ce5c9 | 2408 | /* Parse the other options. */ |
870f6ba8 TF |
2409 | |
2410 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2411 | != NULL) | |
2412 | { | |
2413 | if (strcmpic(ss, US"leaky") == 0) leaky = TRUE; | |
2414 | else if (strcmpic(ss, US"strict") == 0) strict = TRUE; | |
8f240103 | 2415 | else if (strcmpic(ss, US"noupdate") == 0) noupdate = TRUE; |
c99ce5c9 TF |
2416 | else if (strcmpic(ss, US"readonly") == 0) readonly = TRUE; |
2417 | else if (strcmpic(ss, US"per_cmd") == 0) RATE_SET(mode, PER_CMD); | |
2418 | else if (strcmpic(ss, US"per_conn") == 0) | |
2419 | { | |
2420 | RATE_SET(mode, PER_CONN); | |
2421 | if (where == ACL_WHERE_NOTSMTP || where == ACL_WHERE_NOTSMTP_START) | |
2422 | badacl = TRUE; | |
2423 | } | |
2424 | else if (strcmpic(ss, US"per_mail") == 0) | |
2425 | { | |
2426 | RATE_SET(mode, PER_MAIL); | |
2427 | if (where > ACL_WHERE_NOTSMTP) badacl = TRUE; | |
2428 | } | |
2429 | else if (strcmpic(ss, US"per_rcpt") == 0) | |
2430 | { | |
2431 | /* If we are running in the RCPT ACL, then we'll count the recipients | |
2432 | one by one, but if we are running when we have accumulated the whole | |
2433 | list then we'll add them all in one batch. */ | |
2434 | if (where == ACL_WHERE_RCPT) | |
2435 | RATE_SET(mode, PER_RCPT); | |
2436 | else if (where >= ACL_WHERE_PREDATA && where <= ACL_WHERE_NOTSMTP) | |
2437 | RATE_SET(mode, PER_ALLRCPTS), count = (double)recipients_count; | |
2438 | else if (where == ACL_WHERE_MAIL || where > ACL_WHERE_NOTSMTP) | |
2439 | RATE_SET(mode, PER_RCPT), badacl = TRUE; | |
2440 | } | |
2441 | else if (strcmpic(ss, US"per_byte") == 0) | |
2442 | { | |
2443 | /* If we have not yet received the message data and there was no SIZE | |
2444 | declaration on the MAIL comand, then it's safe to just use a value of | |
2445 | zero and let the recorded rate decay as if nothing happened. */ | |
2446 | RATE_SET(mode, PER_MAIL); | |
2447 | if (where > ACL_WHERE_NOTSMTP) badacl = TRUE; | |
2448 | else count = message_size < 0 ? 0.0 : (double)message_size; | |
2449 | } | |
2450 | else if (strcmpic(ss, US"per_addr") == 0) | |
2451 | { | |
2452 | RATE_SET(mode, PER_RCPT); | |
438257ba | 2453 | if (where != ACL_WHERE_RCPT) badacl = TRUE, unique = US"*"; |
c99ce5c9 TF |
2454 | else unique = string_sprintf("%s@%s", deliver_localpart, deliver_domain); |
2455 | } | |
2456 | else if (strncmpic(ss, US"count=", 6) == 0) | |
2457 | { | |
2458 | uschar *e; | |
2459 | count = Ustrtod(ss+6, &e); | |
2460 | if (count < 0.0 || *e != '\0') | |
2461 | return ratelimit_error(log_msgptr, | |
2462 | "\"%s\" is not a positive number", ss); | |
2463 | } | |
2464 | else if (strncmpic(ss, US"unique=", 7) == 0) | |
2465 | unique = string_copy(ss + 7); | |
2466 | else if (key == NULL) | |
2467 | key = string_copy(ss); | |
2468 | else | |
2469 | key = string_sprintf("%s/%s", key, ss); | |
870f6ba8 TF |
2470 | } |
2471 | ||
c99ce5c9 TF |
2472 | /* Sanity check. When the badacl flag is set the update mode must either |
2473 | be readonly (which is the default if it is omitted) or, for backwards | |
2474 | compatibility, a combination of noupdate and strict or leaky. */ | |
2475 | ||
2476 | if (mode == RATE_PER_CLASH) | |
2477 | return ratelimit_error(log_msgptr, "conflicting per_* options"); | |
2478 | if (leaky + strict + readonly > 1) | |
2479 | return ratelimit_error(log_msgptr, "conflicting update modes"); | |
2480 | if (badacl && (leaky || strict) && !noupdate) | |
2481 | return ratelimit_error(log_msgptr, | |
2482 | "\"%s\" must not have /leaky or /strict option in %s ACL", | |
2483 | ratelimit_option_string[mode], acl_wherenames[where]); | |
2484 | ||
2485 | /* Set the default values of any unset options. In readonly mode we | |
2486 | perform the rate computation without any increment so that its value | |
2487 | decays to eventually allow over-limit senders through. */ | |
2488 | ||
2489 | if (noupdate) readonly = TRUE, leaky = strict = FALSE; | |
2490 | if (badacl) readonly = TRUE; | |
2491 | if (readonly) count = 0.0; | |
2492 | if (!strict && !readonly) leaky = TRUE; | |
2493 | if (mode == RATE_PER_WHAT) mode = RATE_PER_MAIL; | |
870f6ba8 | 2494 | |
8f240103 PH |
2495 | /* Create the lookup key. If there is no explicit key, use sender_host_address. |
2496 | If there is no sender_host_address (e.g. -bs or acl_not_smtp) then we simply | |
2497 | omit it. The smoothing constant (sender_rate_period) and the per_xxx options | |
2498 | are added to the key because they alter the meaning of the stored data. */ | |
2499 | ||
2500 | if (key == NULL) | |
2501 | key = (sender_host_address == NULL)? US"" : sender_host_address; | |
870f6ba8 | 2502 | |
c99ce5c9 | 2503 | key = string_sprintf("%s/%s/%s%s", |
8f240103 | 2504 | sender_rate_period, |
c99ce5c9 TF |
2505 | ratelimit_option_string[mode], |
2506 | unique == NULL ? "" : "unique/", | |
8f240103 | 2507 | key); |
870f6ba8 | 2508 | |
c99ce5c9 TF |
2509 | HDEBUG(D_acl) |
2510 | debug_printf("ratelimit condition count=%.0f %.1f/%s\n", count, limit, key); | |
870f6ba8 | 2511 | |
8f240103 PH |
2512 | /* See if we have already computed the rate by looking in the relevant tree. |
2513 | For per-connection rate limiting, store tree nodes and dbdata in the permanent | |
c99ce5c9 TF |
2514 | pool so that they survive across resets. In readonly mode we only remember the |
2515 | result for the rest of this command in case a later command changes it. After | |
2516 | this bit of logic the code is independent of the per_* mode. */ | |
870f6ba8 | 2517 | |
870f6ba8 TF |
2518 | old_pool = store_pool; |
2519 | ||
c99ce5c9 TF |
2520 | if (readonly) |
2521 | anchor = &ratelimiters_cmd; | |
2522 | else switch(mode) { | |
2523 | case RATE_PER_CONN: | |
870f6ba8 TF |
2524 | anchor = &ratelimiters_conn; |
2525 | store_pool = POOL_PERM; | |
c99ce5c9 TF |
2526 | break; |
2527 | case RATE_PER_BYTE: | |
2528 | case RATE_PER_MAIL: | |
2529 | case RATE_PER_ALLRCPTS: | |
870f6ba8 | 2530 | anchor = &ratelimiters_mail; |
c99ce5c9 TF |
2531 | break; |
2532 | case RATE_PER_ADDR: | |
2533 | case RATE_PER_CMD: | |
2534 | case RATE_PER_RCPT: | |
fe0dab11 | 2535 | anchor = &ratelimiters_cmd; |
c99ce5c9 TF |
2536 | break; |
2537 | default: | |
3399bb60 | 2538 | anchor = NULL; /* silence an "unused" complaint */ |
c99ce5c9 TF |
2539 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, |
2540 | "internal ACL error: unknown ratelimit mode %d", mode); | |
2541 | break; | |
2542 | } | |
870f6ba8 | 2543 | |
c99ce5c9 TF |
2544 | t = tree_search(*anchor, key); |
2545 | if (t != NULL) | |
870f6ba8 TF |
2546 | { |
2547 | dbd = t->data.ptr; | |
2548 | /* The following few lines duplicate some of the code below. */ | |
8f240103 | 2549 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2550 | store_pool = old_pool; |
2551 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2552 | HDEBUG(D_acl) | |
2553 | debug_printf("ratelimit found pre-computed rate %s\n", sender_rate); | |
2554 | return rc; | |
2555 | } | |
2556 | ||
c99ce5c9 TF |
2557 | /* We aren't using a pre-computed rate, so get a previously recorded rate |
2558 | from the database, which will be updated and written back if required. */ | |
870f6ba8 TF |
2559 | |
2560 | dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE); | |
2561 | if (dbm == NULL) | |
2562 | { | |
2563 | store_pool = old_pool; | |
2564 | sender_rate = NULL; | |
2565 | HDEBUG(D_acl) debug_printf("ratelimit database not available\n"); | |
2566 | *log_msgptr = US"ratelimit database not available"; | |
2567 | return DEFER; | |
2568 | } | |
c99ce5c9 TF |
2569 | dbdb = dbfn_read_with_length(dbm, key, &dbdb_size); |
2570 | dbd = NULL; | |
870f6ba8 TF |
2571 | |
2572 | gettimeofday(&tv, NULL); | |
2573 | ||
c99ce5c9 TF |
2574 | if (dbdb != NULL) |
2575 | { | |
2576 | /* Locate the basic ratelimit block inside the DB data. */ | |
2577 | HDEBUG(D_acl) debug_printf("ratelimit found key in database\n"); | |
2578 | dbd = &dbdb->dbd; | |
2579 | ||
2580 | /* Forget the old Bloom filter if it is too old, so that we count each | |
2581 | repeating event once per period. We don't simply clear and re-use the old | |
2582 | filter because we want its size to change if the limit changes. Note that | |
2583 | we keep the dbd pointer for copying the rate into the new data block. */ | |
2584 | ||
2585 | if(unique != NULL && tv.tv_sec > dbdb->bloom_epoch + period) | |
2586 | { | |
2587 | HDEBUG(D_acl) debug_printf("ratelimit discarding old Bloom filter\n"); | |
2588 | dbdb = NULL; | |
2589 | } | |
2590 | ||
2591 | /* Sanity check. */ | |
2592 | ||
2593 | if(unique != NULL && dbdb_size < sizeof(*dbdb)) | |
2594 | { | |
2595 | HDEBUG(D_acl) debug_printf("ratelimit discarding undersize Bloom filter\n"); | |
2596 | dbdb = NULL; | |
2597 | } | |
2598 | } | |
2599 | ||
2600 | /* Allocate a new data block if the database lookup failed | |
2601 | or the Bloom filter passed its age limit. */ | |
2602 | ||
2603 | if (dbdb == NULL) | |
2604 | { | |
2605 | if (unique == NULL) | |
2606 | { | |
2607 | /* No Bloom filter. This basic ratelimit block is initialized below. */ | |
2608 | HDEBUG(D_acl) debug_printf("ratelimit creating new rate data block\n"); | |
2609 | dbdb_size = sizeof(*dbd); | |
2610 | dbdb = store_get(dbdb_size); | |
2611 | } | |
2612 | else | |
2613 | { | |
2614 | int extra; | |
2615 | HDEBUG(D_acl) debug_printf("ratelimit creating new Bloom filter\n"); | |
2616 | ||
2617 | /* See the long comment below for an explanation of the magic number 2. | |
2618 | The filter has a minimum size in case the rate limit is very small; | |
2619 | this is determined by the definition of dbdata_ratelimit_unique. */ | |
2620 | ||
2621 | extra = (int)limit * 2 - sizeof(dbdb->bloom); | |
2622 | if (extra < 0) extra = 0; | |
2623 | dbdb_size = sizeof(*dbdb) + extra; | |
2624 | dbdb = store_get(dbdb_size); | |
2625 | dbdb->bloom_epoch = tv.tv_sec; | |
2626 | dbdb->bloom_size = sizeof(dbdb->bloom) + extra; | |
2627 | memset(dbdb->bloom, 0, dbdb->bloom_size); | |
2628 | ||
2629 | /* Preserve any basic ratelimit data (which is our longer-term memory) | |
2630 | by copying it from the discarded block. */ | |
2631 | ||
2632 | if (dbd != NULL) | |
2633 | { | |
2634 | dbdb->dbd = *dbd; | |
2635 | dbd = &dbdb->dbd; | |
2636 | } | |
2637 | } | |
2638 | } | |
2639 | ||
2640 | /* If we are counting unique events, find out if this event is new or not. | |
2641 | If the client repeats the event during the current period then it should be | |
2642 | counted. We skip this code in readonly mode for efficiency, because any | |
2643 | changes to the filter will be discarded and because count is already set to | |
2644 | zero. */ | |
2645 | ||
2646 | if (unique != NULL && !readonly) | |
2647 | { | |
2648 | /* We identify unique events using a Bloom filter. (You can find my | |
2649 | notes on Bloom filters at http://fanf.livejournal.com/81696.html) | |
2650 | With the per_addr option, an "event" is a recipient address, though the | |
2651 | user can use the unique option to define their own events. We only count | |
2652 | an event if we have not seen it before. | |
2653 | ||
2654 | We size the filter according to the rate limit, which (in leaky mode) | |
2655 | is the limit on the population of the filter. We allow 16 bits of space | |
2656 | per entry (see the construction code above) and we set (up to) 8 of them | |
2657 | when inserting an element (see the loop below). The probability of a false | |
2658 | positive (an event we have not seen before but which we fail to count) is | |
2659 | ||
2660 | size = limit * 16 | |
2661 | numhash = 8 | |
2662 | allzero = exp(-numhash * pop / size) | |
2663 | = exp(-0.5 * pop / limit) | |
2664 | fpr = pow(1 - allzero, numhash) | |
2665 | ||
2666 | For senders at the limit the fpr is 0.06% or 1 in 1700 | |
2667 | and for senders at half the limit it is 0.0006% or 1 in 170000 | |
2668 | ||
2669 | In strict mode the Bloom filter can fill up beyond the normal limit, in | |
2670 | which case the false positive rate will rise. This means that the | |
2671 | measured rate for very fast senders can bogusly drop off after a while. | |
2672 | ||
2673 | At twice the limit, the fpr is 2.5% or 1 in 40 | |
2674 | At four times the limit, it is 31% or 1 in 3.2 | |
2675 | ||
2676 | It takes ln(pop/limit) periods for an over-limit burst of pop events to | |
2677 | decay below the limit, and if this is more than one then the Bloom filter | |
2678 | will be discarded before the decay gets that far. The false positive rate | |
2679 | at this threshold is 9.3% or 1 in 10.7. */ | |
2680 | ||
2681 | BOOL seen; | |
2682 | unsigned n, hash, hinc; | |
2683 | uschar md5sum[16]; | |
2684 | md5 md5info; | |
2685 | ||
2686 | /* Instead of using eight independent hash values, we combine two values | |
2687 | using the formula h1 + n * h2. This does not harm the Bloom filter's | |
2688 | performance, and means the amount of hash we need is independent of the | |
2689 | number of bits we set in the filter. */ | |
2690 | ||
2691 | md5_start(&md5info); | |
2692 | md5_end(&md5info, unique, Ustrlen(unique), md5sum); | |
2693 | hash = md5sum[0] | md5sum[1] << 8 | md5sum[2] << 16 | md5sum[3] << 24; | |
2694 | hinc = md5sum[4] | md5sum[5] << 8 | md5sum[6] << 16 | md5sum[7] << 24; | |
2695 | ||
2696 | /* Scan the bits corresponding to this event. A zero bit means we have | |
2697 | not seen it before. Ensure all bits are set to record this event. */ | |
2698 | ||
2699 | HDEBUG(D_acl) debug_printf("ratelimit checking uniqueness of %s\n", unique); | |
2700 | ||
2701 | seen = TRUE; | |
2702 | for (n = 0; n < 8; n++, hash += hinc) | |
2703 | { | |
2704 | int bit = 1 << (hash % 8); | |
2705 | int byte = (hash / 8) % dbdb->bloom_size; | |
2706 | if ((dbdb->bloom[byte] & bit) == 0) | |
2707 | { | |
2708 | dbdb->bloom[byte] |= bit; | |
2709 | seen = FALSE; | |
2710 | } | |
2711 | } | |
2712 | ||
2713 | /* If this event has occurred before, do not count it. */ | |
2714 | ||
2715 | if (seen) | |
2716 | { | |
2717 | HDEBUG(D_acl) debug_printf("ratelimit event found in Bloom filter\n"); | |
2718 | count = 0.0; | |
2719 | } | |
2720 | else | |
2721 | HDEBUG(D_acl) debug_printf("ratelimit event added to Bloom filter\n"); | |
2722 | } | |
2723 | ||
2724 | /* If there was no previous ratelimit data block for this key, initialize | |
2725 | the new one, otherwise update the block from the database. The initial rate | |
2726 | is what would be computed by the code below for an infinite interval. */ | |
2727 | ||
870f6ba8 TF |
2728 | if (dbd == NULL) |
2729 | { | |
c99ce5c9 TF |
2730 | HDEBUG(D_acl) debug_printf("ratelimit initializing new key's rate data\n"); |
2731 | dbd = &dbdb->dbd; | |
870f6ba8 TF |
2732 | dbd->time_stamp = tv.tv_sec; |
2733 | dbd->time_usec = tv.tv_usec; | |
c99ce5c9 | 2734 | dbd->rate = count; |
870f6ba8 TF |
2735 | } |
2736 | else | |
2737 | { | |
2738 | /* The smoothed rate is computed using an exponentially weighted moving | |
2739 | average adjusted for variable sampling intervals. The standard EWMA for | |
2740 | a fixed sampling interval is: f'(t) = (1 - a) * f(t) + a * f'(t - 1) | |
2741 | where f() is the measured value and f'() is the smoothed value. | |
2742 | ||
2743 | Old data decays out of the smoothed value exponentially, such that data n | |
2744 | samples old is multiplied by a^n. The exponential decay time constant p | |
2745 | is defined such that data p samples old is multiplied by 1/e, which means | |
2746 | that a = exp(-1/p). We can maintain the same time constant for a variable | |
2747 | sampling interval i by using a = exp(-i/p). | |
2748 | ||
2749 | The rate we are measuring is messages per period, suitable for directly | |
2750 | comparing with the limit. The average rate between now and the previous | |
2751 | message is period / interval, which we feed into the EWMA as the sample. | |
2752 | ||
2753 | It turns out that the number of messages required for the smoothed rate | |
2754 | to reach the limit when they are sent in a burst is equal to the limit. | |
2755 | This can be seen by analysing the value of the smoothed rate after N | |
2756 | messages sent at even intervals. Let k = (1 - a) * p/i | |
2757 | ||
2758 | rate_1 = (1 - a) * p/i + a * rate_0 | |
2759 | = k + a * rate_0 | |
2760 | rate_2 = k + a * rate_1 | |
2761 | = k + a * k + a^2 * rate_0 | |
2762 | rate_3 = k + a * k + a^2 * k + a^3 * rate_0 | |
2763 | rate_N = rate_0 * a^N + k * SUM(x=0..N-1)(a^x) | |
2764 | = rate_0 * a^N + k * (1 - a^N) / (1 - a) | |
2765 | = rate_0 * a^N + p/i * (1 - a^N) | |
2766 | ||
2767 | When N is large, a^N -> 0 so rate_N -> p/i as desired. | |
2768 | ||
2769 | rate_N = p/i + (rate_0 - p/i) * a^N | |
2770 | a^N = (rate_N - p/i) / (rate_0 - p/i) | |
2771 | N * -i/p = log((rate_N - p/i) / (rate_0 - p/i)) | |
2772 | N = p/i * log((rate_0 - p/i) / (rate_N - p/i)) | |
2773 | ||
2774 | Numerical analysis of the above equation, setting the computed rate to | |
2775 | increase from rate_0 = 0 to rate_N = limit, shows that for large sending | |
2776 | rates, p/i, the number of messages N = limit. So limit serves as both the | |
2777 | maximum rate measured in messages per period, and the maximum number of | |
2778 | messages that can be sent in a fast burst. */ | |
2779 | ||
2780 | double this_time = (double)tv.tv_sec | |
2781 | + (double)tv.tv_usec / 1000000.0; | |
2782 | double prev_time = (double)dbd->time_stamp | |
2783 | + (double)dbd->time_usec / 1000000.0; | |
870f6ba8 TF |
2784 | |
2785 | /* We must avoid division by zero, and deal gracefully with the clock going | |
2786 | backwards. If we blunder ahead when time is in reverse then the computed | |
e5d5a95f | 2787 | rate will be bogus. To be safe we clamp interval to a very small number. */ |
870f6ba8 | 2788 | |
e5d5a95f TF |
2789 | double interval = this_time - prev_time <= 0.0 ? 1e-9 |
2790 | : this_time - prev_time; | |
2791 | ||
2792 | double i_over_p = interval / period; | |
2793 | double a = exp(-i_over_p); | |
870f6ba8 | 2794 | |
c99ce5c9 TF |
2795 | /* Combine the instantaneous rate (period / interval) with the previous rate |
2796 | using the smoothing factor a. In order to measure sized events, multiply the | |
2797 | instantaneous rate by the count of bytes or recipients etc. */ | |
2798 | ||
870f6ba8 TF |
2799 | dbd->time_stamp = tv.tv_sec; |
2800 | dbd->time_usec = tv.tv_usec; | |
c99ce5c9 TF |
2801 | dbd->rate = (1 - a) * count / i_over_p + a * dbd->rate; |
2802 | ||
2803 | /* When events are very widely spaced the computed rate tends towards zero. | |
2804 | Although this is accurate it turns out not to be useful for our purposes, | |
2805 | especially when the first event after a long silence is the start of a spam | |
2806 | run. A more useful model is that the rate for an isolated event should be the | |
2807 | size of the event per the period size, ignoring the lack of events outside | |
2808 | the current period and regardless of where the event falls in the period. So, | |
2809 | if the interval was so long that the calculated rate is unhelpfully small, we | |
2810 | re-intialize the rate. In the absence of higher-rate bursts, the condition | |
2811 | below is true if the interval is greater than the period. */ | |
2812 | ||
2813 | if (dbd->rate < count) dbd->rate = count; | |
870f6ba8 TF |
2814 | } |
2815 | ||
c99ce5c9 TF |
2816 | /* Clients sending at the limit are considered to be over the limit. |
2817 | This matters for edge cases such as a limit of zero, when the client | |
2818 | should be completely blocked. */ | |
3348576f | 2819 | |
8f240103 | 2820 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2821 | |
2822 | /* Update the state if the rate is low or if we are being strict. If we | |
2823 | are in leaky mode and the sender's rate is too high, we do not update | |
2824 | the recorded rate in order to avoid an over-aggressive sender's retry | |
c99ce5c9 TF |
2825 | rate preventing them from getting any email through. If readonly is set, |
2826 | neither leaky nor strict are set, so we do not do any updates. */ | |
870f6ba8 | 2827 | |
c99ce5c9 | 2828 | if ((rc == FAIL && leaky) || strict) |
8f240103 | 2829 | { |
c99ce5c9 | 2830 | dbfn_write(dbm, key, dbdb, dbdb_size); |
8f240103 PH |
2831 | HDEBUG(D_acl) debug_printf("ratelimit db updated\n"); |
2832 | } | |
2833 | else | |
2834 | { | |
2835 | HDEBUG(D_acl) debug_printf("ratelimit db not updated: %s\n", | |
c99ce5c9 | 2836 | readonly? "readonly mode" : "over the limit, but leaky"); |
8f240103 PH |
2837 | } |
2838 | ||
870f6ba8 TF |
2839 | dbfn_close(dbm); |
2840 | ||
c99ce5c9 | 2841 | /* Store the result in the tree for future reference. */ |
870f6ba8 | 2842 | |
c99ce5c9 TF |
2843 | t = store_get(sizeof(tree_node) + Ustrlen(key)); |
2844 | t->data.ptr = dbd; | |
2845 | Ustrcpy(t->name, key); | |
2846 | (void)tree_insertnode(anchor, t); | |
870f6ba8 TF |
2847 | |
2848 | /* We create the formatted version of the sender's rate very late in | |
2849 | order to ensure that it is done using the correct storage pool. */ | |
2850 | ||
2851 | store_pool = old_pool; | |
2852 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2853 | ||
2854 | HDEBUG(D_acl) | |
2855 | debug_printf("ratelimit computed rate %s\n", sender_rate); | |
2856 | ||
2857 | return rc; | |
2858 | } | |
2859 | ||
2860 | ||
2861 | ||
b0019c78 TF |
2862 | /************************************************* |
2863 | * The udpsend ACL modifier * | |
2864 | *************************************************/ | |
2865 | ||
2866 | /* Called by acl_check_condition() below. | |
2867 | ||
2868 | Arguments: | |
2869 | arg the option string for udpsend= | |
2870 | log_msgptr for error messages | |
2871 | ||
2872 | Returns: OK - Completed. | |
2873 | DEFER - Problem with DNS lookup. | |
2874 | ERROR - Syntax error in options. | |
2875 | */ | |
2876 | ||
2877 | static int | |
55414b25 | 2878 | acl_udpsend(const uschar *arg, uschar **log_msgptr) |
b0019c78 TF |
2879 | { |
2880 | int sep = 0; | |
2881 | uschar *hostname; | |
2882 | uschar *portstr; | |
2883 | uschar *portend; | |
2884 | host_item *h; | |
2885 | int portnum; | |
b0019c78 TF |
2886 | int len; |
2887 | int r, s; | |
b1f8e4f8 | 2888 | uschar * errstr; |
b0019c78 TF |
2889 | |
2890 | hostname = string_nextinlist(&arg, &sep, NULL, 0); | |
2891 | portstr = string_nextinlist(&arg, &sep, NULL, 0); | |
2892 | ||
2893 | if (hostname == NULL) | |
2894 | { | |
217b0e56 | 2895 | *log_msgptr = US"missing destination host in \"udpsend\" modifier"; |
b0019c78 TF |
2896 | return ERROR; |
2897 | } | |
2898 | if (portstr == NULL) | |
2899 | { | |
217b0e56 | 2900 | *log_msgptr = US"missing destination port in \"udpsend\" modifier"; |
b0019c78 TF |
2901 | return ERROR; |
2902 | } | |
2903 | if (arg == NULL) | |
2904 | { | |
217b0e56 | 2905 | *log_msgptr = US"missing datagram payload in \"udpsend\" modifier"; |
b0019c78 TF |
2906 | return ERROR; |
2907 | } | |
2908 | portnum = Ustrtol(portstr, &portend, 10); | |
2909 | if (*portend != '\0') | |
2910 | { | |
217b0e56 | 2911 | *log_msgptr = US"bad destination port in \"udpsend\" modifier"; |
b0019c78 TF |
2912 | return ERROR; |
2913 | } | |
2914 | ||
2915 | /* Make a single-item host list. */ | |
2916 | h = store_get(sizeof(host_item)); | |
2917 | memset(h, 0, sizeof(host_item)); | |
2918 | h->name = hostname; | |
2919 | h->port = portnum; | |
2920 | h->mx = MX_NONE; | |
2921 | ||
2922 | if (string_is_ip_address(hostname, NULL)) | |
2923 | h->address = hostname, r = HOST_FOUND; | |
2924 | else | |
2925 | r = host_find_byname(h, NULL, 0, NULL, FALSE); | |
2926 | if (r == HOST_FIND_FAILED || r == HOST_FIND_AGAIN) | |
2927 | { | |
217b0e56 | 2928 | *log_msgptr = US"DNS lookup failed in \"udpsend\" modifier"; |
b0019c78 TF |
2929 | return DEFER; |
2930 | } | |
2931 | ||
2932 | HDEBUG(D_acl) | |
2933 | debug_printf("udpsend [%s]:%d %s\n", h->address, portnum, arg); | |
2934 | ||
b1f8e4f8 JH |
2935 | r = s = ip_connectedsocket(SOCK_DGRAM, h->address, portnum, portnum, |
2936 | 1, NULL, &errstr); | |
b0019c78 | 2937 | if (r < 0) goto defer; |
27f9999e | 2938 | len = Ustrlen(arg); |
9cb1785a | 2939 | r = send(s, arg, len, 0); |
b1f8e4f8 JH |
2940 | if (r < 0) |
2941 | { | |
2942 | errstr = US strerror(errno); | |
2943 | close(s); | |
2944 | goto defer; | |
2945 | } | |
2946 | close(s); | |
b0019c78 TF |
2947 | if (r < len) |
2948 | { | |
2949 | *log_msgptr = | |
2950 | string_sprintf("\"udpsend\" truncated from %d to %d octets", len, r); | |
2951 | return DEFER; | |
2952 | } | |
2953 | ||
2954 | HDEBUG(D_acl) | |
2955 | debug_printf("udpsend %d bytes\n", r); | |
2956 | ||
2957 | return OK; | |
2958 | ||
2959 | defer: | |
b1f8e4f8 | 2960 | *log_msgptr = string_sprintf("\"udpsend\" failed: %s", errstr); |
b0019c78 TF |
2961 | return DEFER; |
2962 | } | |
2963 | ||
2964 | ||
2965 | ||
059ec3d9 PH |
2966 | /************************************************* |
2967 | * Handle conditions/modifiers on an ACL item * | |
2968 | *************************************************/ | |
2969 | ||
2970 | /* Called from acl_check() below. | |
2971 | ||
2972 | Arguments: | |
2973 | verb ACL verb | |
2974 | cb ACL condition block - if NULL, result is OK | |
2975 | where where called from | |
2976 | addr the address being checked for RCPT, or NULL | |
2977 | level the nesting level | |
2978 | epp pointer to pass back TRUE if "endpass" encountered | |
2979 | (applies only to "accept" and "discard") | |
2980 | user_msgptr user message pointer | |
2981 | log_msgptr log message pointer | |
2982 | basic_errno pointer to where to put verify error | |
2983 | ||
2984 | Returns: OK - all conditions are met | |
2985 | DISCARD - an "acl" condition returned DISCARD - only allowed | |
2986 | for "accept" or "discard" verbs | |
2987 | FAIL - at least one condition fails | |
2988 | FAIL_DROP - an "acl" condition returned FAIL_DROP | |
2989 | DEFER - can't tell at the moment (typically, lookup defer, | |
2990 | but can be temporary callout problem) | |
2991 | ERROR - ERROR from nested ACL or expansion failure or other | |
2992 | error | |
2993 | */ | |
2994 | ||
2995 | static int | |
2996 | acl_check_condition(int verb, acl_condition_block *cb, int where, | |
2997 | address_item *addr, int level, BOOL *epp, uschar **user_msgptr, | |
2998 | uschar **log_msgptr, int *basic_errno) | |
2999 | { | |
3000 | uschar *user_message = NULL; | |
3001 | uschar *log_message = NULL; | |
ed7f7860 PP |
3002 | uschar *debug_tag = NULL; |
3003 | uschar *debug_opts = NULL; | |
059ec3d9 | 3004 | int rc = OK; |
8523533c | 3005 | #ifdef WITH_CONTENT_SCAN |
0f0c8159 | 3006 | int sep = -'/'; |
8523533c | 3007 | #endif |
059ec3d9 PH |
3008 | |
3009 | for (; cb != NULL; cb = cb->next) | |
3010 | { | |
55414b25 | 3011 | const uschar *arg; |
8e669ac1 | 3012 | int control_type; |
059ec3d9 PH |
3013 | |
3014 | /* The message and log_message items set up messages to be used in | |
3015 | case of rejection. They are expanded later. */ | |
3016 | ||
3017 | if (cb->type == ACLC_MESSAGE) | |
3018 | { | |
187bc588 | 3019 | HDEBUG(D_acl) debug_printf(" message: %s\n", cb->arg); |
059ec3d9 PH |
3020 | user_message = cb->arg; |
3021 | continue; | |
3022 | } | |
3023 | ||
3024 | if (cb->type == ACLC_LOG_MESSAGE) | |
3025 | { | |
187bc588 | 3026 | HDEBUG(D_acl) debug_printf("l_message: %s\n", cb->arg); |
059ec3d9 PH |
3027 | log_message = cb->arg; |
3028 | continue; | |
3029 | } | |
3030 | ||
3031 | /* The endpass "condition" just sets a flag to show it occurred. This is | |
3032 | checked at compile time to be on an "accept" or "discard" item. */ | |
3033 | ||
3034 | if (cb->type == ACLC_ENDPASS) | |
3035 | { | |
3036 | *epp = TRUE; | |
3037 | continue; | |
3038 | } | |
3039 | ||
3040 | /* For other conditions and modifiers, the argument is expanded now for some | |
3041 | of them, but not for all, because expansion happens down in some lower level | |
3042 | checking functions in some cases. */ | |
3043 | ||
3044 | if (cond_expand_at_top[cb->type]) | |
3045 | { | |
3046 | arg = expand_string(cb->arg); | |
3047 | if (arg == NULL) | |
3048 | { | |
3049 | if (expand_string_forcedfail) continue; | |
3050 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
3051 | cb->arg, expand_string_message); | |
3052 | return search_find_defer? DEFER : ERROR; | |
3053 | } | |
3054 | } | |
3055 | else arg = cb->arg; | |
3056 | ||
3057 | /* Show condition, and expanded condition if it's different */ | |
3058 | ||
3059 | HDEBUG(D_acl) | |
3060 | { | |
3061 | int lhswidth = 0; | |
3062 | debug_printf("check %s%s %n", | |
3063 | (!cond_modifiers[cb->type] && cb->u.negated)? "!":"", | |
3064 | conditions[cb->type], &lhswidth); | |
3065 | ||
3066 | if (cb->type == ACLC_SET) | |
3067 | { | |
38a0a95f PH |
3068 | debug_printf("acl_%s ", cb->u.varname); |
3069 | lhswidth += 5 + Ustrlen(cb->u.varname); | |
059ec3d9 PH |
3070 | } |
3071 | ||
3072 | debug_printf("= %s\n", cb->arg); | |
3073 | ||
3074 | if (arg != cb->arg) | |
3075 | debug_printf("%.*s= %s\n", lhswidth, | |
3076 | US" ", CS arg); | |
3077 | } | |
3078 | ||
3079 | /* Check that this condition makes sense at this time */ | |
3080 | ||
3081 | if ((cond_forbids[cb->type] & (1 << where)) != 0) | |
3082 | { | |
3083 | *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL", | |
3084 | cond_modifiers[cb->type]? "use" : "test", | |
3085 | conditions[cb->type], acl_wherenames[where]); | |
3086 | return ERROR; | |
3087 | } | |
3088 | ||
3089 | /* Run the appropriate test for each condition, or take the appropriate | |
3090 | action for the remaining modifiers. */ | |
3091 | ||
3092 | switch(cb->type) | |
3093 | { | |
71fafd95 PH |
3094 | case ACLC_ADD_HEADER: |
3095 | setup_header(arg); | |
3096 | break; | |
3097 | ||
059ec3d9 PH |
3098 | /* A nested ACL that returns "discard" makes sense only for an "accept" or |
3099 | "discard" verb. */ | |
71fafd95 | 3100 | |
059ec3d9 | 3101 | case ACLC_ACL: |
f60d98e8 | 3102 | rc = acl_check_wargs(where, addr, arg, level+1, user_msgptr, log_msgptr); |
7421ecab JH |
3103 | if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD) |
3104 | { | |
3105 | *log_msgptr = string_sprintf("nested ACL returned \"discard\" for " | |
3106 | "\"%s\" command (only allowed with \"accept\" or \"discard\")", | |
3107 | verbs[verb]); | |
3108 | return ERROR; | |
3109 | } | |
059ec3d9 PH |
3110 | break; |
3111 | ||
3112 | case ACLC_AUTHENTICATED: | |
3113 | rc = (sender_host_authenticated == NULL)? FAIL : | |
3114 | match_isinlist(sender_host_authenticated, &arg, 0, NULL, NULL, MCL_STRING, | |
3115 | TRUE, NULL); | |
3116 | break; | |
3117 | ||
71fafd95 | 3118 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
8523533c TK |
3119 | case ACLC_BMI_OPTIN: |
3120 | { | |
3121 | int old_pool = store_pool; | |
3122 | store_pool = POOL_PERM; | |
3123 | bmi_current_optin = string_copy(arg); | |
3124 | store_pool = old_pool; | |
3125 | } | |
3126 | break; | |
71fafd95 | 3127 | #endif |
8523533c | 3128 | |
059ec3d9 | 3129 | case ACLC_CONDITION: |
f3766eb5 NM |
3130 | /* The true/false parsing here should be kept in sync with that used in |
3131 | expand.c when dealing with ECOND_BOOL so that we don't have too many | |
3132 | different definitions of what can be a boolean. */ | |
51c7471d JH |
3133 | if (*arg == '-' |
3134 | ? Ustrspn(arg+1, "0123456789") == Ustrlen(arg+1) /* Negative number */ | |
3135 | : Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */ | |
059ec3d9 PH |
3136 | rc = (Uatoi(arg) == 0)? FAIL : OK; |
3137 | else | |
3138 | rc = (strcmpic(arg, US"no") == 0 || | |
3139 | strcmpic(arg, US"false") == 0)? FAIL : | |
3140 | (strcmpic(arg, US"yes") == 0 || | |
3141 | strcmpic(arg, US"true") == 0)? OK : DEFER; | |
3142 | if (rc == DEFER) | |
3143 | *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg); | |
3144 | break; | |
3145 | ||
c3611384 PH |
3146 | case ACLC_CONTINUE: /* Always succeeds */ |
3147 | break; | |
3148 | ||
059ec3d9 | 3149 | case ACLC_CONTROL: |
c5fcb476 | 3150 | { |
55414b25 JH |
3151 | const uschar *p = NULL; |
3152 | control_type = decode_control(arg, &p, where, log_msgptr); | |
4840604e | 3153 | |
55414b25 | 3154 | /* Check if this control makes sense at this time */ |
f7572e5a | 3155 | |
55414b25 JH |
3156 | if ((control_forbids[control_type] & (1 << where)) != 0) |
3157 | { | |
3158 | *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL", | |
3159 | controls[control_type], acl_wherenames[where]); | |
3160 | return ERROR; | |
3161 | } | |
8800895a | 3162 | |
55414b25 JH |
3163 | switch(control_type) |
3164 | { | |
3165 | case CONTROL_AUTH_UNADVERTISED: | |
3166 | allow_auth_unadvertised = TRUE; | |
3167 | break; | |
3168 | ||
3169 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
3170 | case CONTROL_BMI_RUN: | |
3171 | bmi_run = 1; | |
3172 | break; | |
3173 | #endif | |
3174 | ||
3175 | #ifndef DISABLE_DKIM | |
3176 | case CONTROL_DKIM_VERIFY: | |
3177 | dkim_disable_verify = TRUE; | |
3178 | #ifdef EXPERIMENTAL_DMARC | |
3179 | /* Since DKIM was blocked, skip DMARC too */ | |
3180 | dmarc_disable_verify = TRUE; | |
3181 | dmarc_enable_forensic = FALSE; | |
3182 | #endif | |
3183 | break; | |
3184 | #endif | |
3185 | ||
3186 | #ifdef EXPERIMENTAL_DMARC | |
3187 | case CONTROL_DMARC_VERIFY: | |
3188 | dmarc_disable_verify = TRUE; | |
3189 | break; | |
3190 | ||
3191 | case CONTROL_DMARC_FORENSIC: | |
3192 | dmarc_enable_forensic = TRUE; | |
3193 | break; | |
3194 | #endif | |
3195 | ||
3196 | case CONTROL_DSCP: | |
3197 | if (*p == '/') | |
3198 | { | |
3199 | int fd, af, level, optname, value; | |
3200 | /* If we are acting on stdin, the setsockopt may fail if stdin is not | |
3201 | a socket; we can accept that, we'll just debug-log failures anyway. */ | |
3202 | fd = fileno(smtp_in); | |
3203 | af = ip_get_address_family(fd); | |
3204 | if (af < 0) | |
3205 | { | |
3206 | HDEBUG(D_acl) | |
3207 | debug_printf("smtp input is probably not a socket [%s], not setting DSCP\n", | |
3208 | strerror(errno)); | |
3209 | break; | |
3210 | } | |
3211 | if (dscp_lookup(p+1, af, &level, &optname, &value)) | |
3212 | { | |
3213 | if (setsockopt(fd, level, optname, &value, sizeof(value)) < 0) | |
3214 | { | |
3215 | HDEBUG(D_acl) debug_printf("failed to set input DSCP[%s]: %s\n", | |
3216 | p+1, strerror(errno)); | |
3217 | } | |
3218 | else | |
3219 | { | |
3220 | HDEBUG(D_acl) debug_printf("set input DSCP to \"%s\"\n", p+1); | |
3221 | } | |
3222 | } | |
3223 | else | |
3224 | { | |
3225 | *log_msgptr = string_sprintf("unrecognised DSCP value in \"control=%s\"", arg); | |
3226 | return ERROR; | |
3227 | } | |
3228 | } | |
3229 | else | |
3230 | { | |
3231 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3232 | return ERROR; | |
3233 | } | |
3234 | break; | |
3235 | ||
3236 | case CONTROL_ERROR: | |
3237 | return ERROR; | |
3238 | ||
3239 | case CONTROL_CASEFUL_LOCAL_PART: | |
3240 | deliver_localpart = addr->cc_local_part; | |
3241 | break; | |
3242 | ||
3243 | case CONTROL_CASELOWER_LOCAL_PART: | |
3244 | deliver_localpart = addr->lc_local_part; | |
3245 | break; | |
3246 | ||
3247 | case CONTROL_ENFORCE_SYNC: | |
3248 | smtp_enforce_sync = TRUE; | |
3249 | break; | |
3250 | ||
3251 | case CONTROL_NO_ENFORCE_SYNC: | |
3252 | smtp_enforce_sync = FALSE; | |
3253 | break; | |
3254 | ||
3255 | #ifdef WITH_CONTENT_SCAN | |
3256 | case CONTROL_NO_MBOX_UNSPOOL: | |
3257 | no_mbox_unspool = TRUE; | |
3258 | break; | |
3259 | #endif | |
3260 | ||
3261 | case CONTROL_NO_MULTILINE: | |
3262 | no_multiline_responses = TRUE; | |
3263 | break; | |
3264 | ||
3265 | case CONTROL_NO_PIPELINING: | |
3266 | pipelining_enable = FALSE; | |
3267 | break; | |
3268 | ||
3269 | case CONTROL_NO_DELAY_FLUSH: | |
3270 | disable_delay_flush = TRUE; | |
3271 | break; | |
3272 | ||
3273 | case CONTROL_NO_CALLOUT_FLUSH: | |
3274 | disable_callout_flush = TRUE; | |
3275 | break; | |
3276 | ||
3277 | case CONTROL_FAKEREJECT: | |
3278 | cancel_cutthrough_connection("fakereject"); | |
3279 | case CONTROL_FAKEDEFER: | |
3280 | fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL; | |
3281 | if (*p == '/') | |
3282 | { | |
3283 | const uschar *pp = p + 1; | |
3284 | while (*pp != 0) pp++; | |
3285 | fake_response_text = expand_string(string_copyn(p+1, pp-p-1)); | |
3286 | p = pp; | |
3287 | } | |
3288 | else | |
3289 | { | |
3290 | /* Explicitly reset to default string */ | |
3291 | 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)."; | |
3292 | } | |
3293 | break; | |
ed7f7860 | 3294 | |
55414b25 JH |
3295 | case CONTROL_FREEZE: |
3296 | deliver_freeze = TRUE; | |
3297 | deliver_frozen_at = time(NULL); | |
3298 | freeze_tell = freeze_tell_config; /* Reset to configured value */ | |
3299 | if (Ustrncmp(p, "/no_tell", 8) == 0) | |
3300 | { | |
3301 | p += 8; | |
3302 | freeze_tell = NULL; | |
3303 | } | |
3304 | if (*p != 0) | |
3305 | { | |
3306 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3307 | return ERROR; | |
3308 | } | |
3309 | cancel_cutthrough_connection("item frozen"); | |
3310 | break; | |
3311 | ||
3312 | case CONTROL_QUEUE_ONLY: | |
3313 | queue_only_policy = TRUE; | |
3314 | cancel_cutthrough_connection("queueing forced"); | |
3315 | break; | |
3316 | ||
3317 | case CONTROL_SUBMISSION: | |
3318 | originator_name = US""; | |
3319 | submission_mode = TRUE; | |
3320 | while (*p == '/') | |
3321 | { | |
3322 | if (Ustrncmp(p, "/sender_retain", 14) == 0) | |
3323 | { | |
3324 | p += 14; | |
3325 | active_local_sender_retain = TRUE; | |
3326 | active_local_from_check = FALSE; | |
3327 | } | |
3328 | else if (Ustrncmp(p, "/domain=", 8) == 0) | |
3329 | { | |
3330 | const uschar *pp = p + 8; | |
3331 | while (*pp != 0 && *pp != '/') pp++; | |
3332 | submission_domain = string_copyn(p+8, pp-p-8); | |
3333 | p = pp; | |
3334 | } | |
3335 | /* The name= option must be last, because it swallows the rest of | |
3336 | the string. */ | |
3337 | else if (Ustrncmp(p, "/name=", 6) == 0) | |
3338 | { | |
3339 | const uschar *pp = p + 6; | |
3340 | while (*pp != 0) pp++; | |
3341 | submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6, | |
3342 | big_buffer, big_buffer_size)); | |
3343 | p = pp; | |
3344 | } | |
3345 | else break; | |
3346 | } | |
3347 | if (*p != 0) | |
3348 | { | |
3349 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3350 | return ERROR; | |
3351 | } | |
3352 | break; | |
e4bdf652 | 3353 | |
55414b25 JH |
3354 | case CONTROL_DEBUG: |
3355 | while (*p == '/') | |
3356 | { | |
3357 | if (Ustrncmp(p, "/tag=", 5) == 0) | |
3358 | { | |
3359 | const uschar *pp = p + 5; | |
3360 | while (*pp != '\0' && *pp != '/') pp++; | |
3361 | debug_tag = string_copyn(p+5, pp-p-5); | |
3362 | p = pp; | |
3363 | } | |
3364 | else if (Ustrncmp(p, "/opts=", 6) == 0) | |
3365 | { | |
3366 | const uschar *pp = p + 6; | |
3367 | while (*pp != '\0' && *pp != '/') pp++; | |
3368 | debug_opts = string_copyn(p+6, pp-p-6); | |
3369 | p = pp; | |
3370 | } | |
3371 | } | |
3372 | debug_logging_activate(debug_tag, debug_opts); | |
3373 | break; | |
3374 | ||
3375 | case CONTROL_SUPPRESS_LOCAL_FIXUPS: | |
3376 | suppress_local_fixups = TRUE; | |
3377 | break; | |
3378 | ||
3379 | case CONTROL_CUTTHROUGH_DELIVERY: | |
a2b89db1 | 3380 | #ifndef DISABLE_PRDR |
55414b25 | 3381 | if (prdr_requested) |
a2b89db1 PP |
3382 | #else |
3383 | if (0) | |
3384 | #endif | |
55414b25 JH |
3385 | /* Too hard to think about for now. We might in future cutthrough |
3386 | the case where both sides handle prdr and this-node prdr acl | |
3387 | is "accept" */ | |
93a6fce2 | 3388 | *log_msgptr = string_sprintf("PRDR on %s reception\n", arg); |
5032d1cf JH |
3389 | else |
3390 | { | |
55414b25 JH |
3391 | if (deliver_freeze) |
3392 | *log_msgptr = US"frozen"; | |
3393 | else if (queue_only_policy) | |
3394 | *log_msgptr = US"queue-only"; | |
3395 | else if (fake_response == FAIL) | |
3396 | *log_msgptr = US"fakereject"; | |
3397 | else | |
3398 | { | |
3399 | if (rcpt_count == 1) cutthrough.delivery = TRUE; | |
3400 | break; | |
3401 | } | |
3402 | *log_msgptr = string_sprintf("\"control=%s\" on %s item", | |
3403 | arg, *log_msgptr); | |
5032d1cf | 3404 | } |
55414b25 | 3405 | return ERROR; |
3c8b3577 | 3406 | |
8c5d388a | 3407 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
3408 | case CONTROL_UTF8_DOWNCONVERT: |
3409 | if (*p == '/') | |
3410 | { | |
921dfc11 JH |
3411 | if (p[1] == '1') |
3412 | { | |
3413 | message_utf8_downconvert = 1; | |
3414 | addr->prop.utf8_downcvt = TRUE; | |
3415 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3416 | p += 2; | |
3417 | break; | |
3418 | } | |
3419 | if (p[1] == '0') | |
3420 | { | |
3421 | message_utf8_downconvert = 0; | |
3422 | addr->prop.utf8_downcvt = FALSE; | |
3423 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3424 | p += 2; | |
3425 | break; | |
3426 | } | |
3c8b3577 | 3427 | if (p[1] == '-' && p[2] == '1') |
921dfc11 JH |
3428 | { |
3429 | message_utf8_downconvert = -1; | |
3430 | addr->prop.utf8_downcvt = FALSE; | |
3431 | addr->prop.utf8_downcvt_maybe = TRUE; | |
3432 | p += 3; | |
3433 | break; | |
3434 | } | |
3c8b3577 JH |
3435 | *log_msgptr = US"bad option value for control=utf8_downconvert"; |
3436 | } | |
3437 | else | |
3438 | { | |
921dfc11 JH |
3439 | message_utf8_downconvert = 1; |
3440 | addr->prop.utf8_downcvt = TRUE; | |
3441 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3442 | break; | |
3c8b3577 JH |
3443 | } |
3444 | return ERROR; | |
8c5d388a | 3445 | #endif |
3c8b3577 | 3446 | |
9171d434 | 3447 | } |
55414b25 | 3448 | break; |
059ec3d9 | 3449 | } |
059ec3d9 | 3450 | |
6a8f9482 TK |
3451 | #ifdef EXPERIMENTAL_DCC |
3452 | case ACLC_DCC: | |
3453 | { | |
3454 | /* Seperate the regular expression and any optional parameters. */ | |
55414b25 JH |
3455 | const uschar * list = arg; |
3456 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
6a8f9482 TK |
3457 | /* Run the dcc backend. */ |
3458 | rc = dcc_process(&ss); | |
3459 | /* Modify return code based upon the existance of options. */ | |
3c8b3577 | 3460 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) |
6a8f9482 | 3461 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) |
3c8b3577 | 3462 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ |
6a8f9482 TK |
3463 | } |
3464 | break; | |
3465 | #endif | |
3466 | ||
71fafd95 | 3467 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3468 | case ACLC_DECODE: |
3469 | rc = mime_decode(&arg); | |
3470 | break; | |
71fafd95 | 3471 | #endif |
8523533c | 3472 | |
059ec3d9 PH |
3473 | case ACLC_DELAY: |
3474 | { | |
3475 | int delay = readconf_readtime(arg, 0, FALSE); | |
3476 | if (delay < 0) | |
3477 | { | |
3478 | *log_msgptr = string_sprintf("syntax error in argument for \"delay\" " | |
3479 | "modifier: \"%s\" is not a time value", arg); | |
3480 | return ERROR; | |
3481 | } | |
3482 | else | |
3483 | { | |
3484 | HDEBUG(D_acl) debug_printf("delay modifier requests %d-second delay\n", | |
3485 | delay); | |
3486 | if (host_checking) | |
3487 | { | |
3488 | HDEBUG(D_acl) | |
3489 | debug_printf("delay skipped in -bh checking mode\n"); | |
3490 | } | |
010c2d14 | 3491 | |
ae9d18bc JH |
3492 | /* NOTE 1: Remember that we may be |
3493 | dealing with stdin/stdout here, in addition to TCP/IP connections. | |
3494 | Also, delays may be specified for non-SMTP input, where smtp_out and | |
3495 | smtp_in will be NULL. Whatever is done must work in all cases. | |
3496 | ||
3497 | NOTE 2: The added feature of flushing the output before a delay must | |
3498 | apply only to SMTP input. Hence the test for smtp_out being non-NULL. | |
3499 | */ | |
3500 | ||
3501 | else | |
3502 | { | |
3503 | if (smtp_out != NULL && !disable_delay_flush) | |
3504 | mac_smtp_fflush(); | |
3505 | ||
861a7c51 | 3506 | #if !defined(NO_POLL_H) && defined (POLLRDHUP) |
ae9d18bc JH |
3507 | { |
3508 | struct pollfd p; | |
3509 | nfds_t n = 0; | |
3510 | if (smtp_out) | |
3511 | { | |
3512 | p.fd = fileno(smtp_out); | |
3513 | p.events = POLLRDHUP; | |
3514 | n = 1; | |
3515 | } | |
3516 | if (poll(&p, n, delay*1000) > 0) | |
3517 | HDEBUG(D_acl) debug_printf("delay cancelled by peer close\n"); | |
3518 | } | |
3519 | #else | |
010c2d14 PH |
3520 | /* It appears to be impossible to detect that a TCP/IP connection has |
3521 | gone away without reading from it. This means that we cannot shorten | |
3522 | the delay below if the client goes away, because we cannot discover | |
3523 | that the client has closed its end of the connection. (The connection | |
3524 | is actually in a half-closed state, waiting for the server to close its | |
3525 | end.) It would be nice to be able to detect this state, so that the | |
3526 | Exim process is not held up unnecessarily. However, it seems that we | |
3527 | can't. The poll() function does not do the right thing, and in any case | |
3528 | it is not always available. | |
047bdd8c | 3529 | */ |
010c2d14 | 3530 | |
86b8287f | 3531 | while (delay > 0) delay = sleep(delay); |
ae9d18bc | 3532 | #endif |
8e669ac1 | 3533 | } |
059ec3d9 PH |
3534 | } |
3535 | } | |
3536 | break; | |
3537 | ||
71fafd95 | 3538 | #ifdef WITH_OLD_DEMIME |
8523533c TK |
3539 | case ACLC_DEMIME: |
3540 | rc = demime(&arg); | |
3541 | break; | |
71fafd95 | 3542 | #endif |
8523533c | 3543 | |
80a47a2c TK |
3544 | #ifndef DISABLE_DKIM |
3545 | case ACLC_DKIM_SIGNER: | |
9e5d6b55 TK |
3546 | if (dkim_cur_signer != NULL) |
3547 | rc = match_isinlist(dkim_cur_signer, | |
80a47a2c | 3548 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); |
80a47a2c | 3549 | else |
80a47a2c | 3550 | rc = FAIL; |
71fafd95 PH |
3551 | break; |
3552 | ||
80a47a2c TK |
3553 | case ACLC_DKIM_STATUS: |
3554 | rc = match_isinlist(dkim_exim_expand_query(DKIM_VERIFY_STATUS), | |
3555 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); | |
71fafd95 PH |
3556 | break; |
3557 | #endif | |
fb2274d4 | 3558 | |
4840604e TL |
3559 | #ifdef EXPERIMENTAL_DMARC |
3560 | case ACLC_DMARC_STATUS: | |
4a8ce2d8 | 3561 | if (!dmarc_has_been_checked) |
4840604e | 3562 | dmarc_process(); |
4a8ce2d8 | 3563 | dmarc_has_been_checked = TRUE; |
4840604e TL |
3564 | /* used long way of dmarc_exim_expand_query() in case we need more |
3565 | * view into the process in the future. */ | |
3566 | rc = match_isinlist(dmarc_exim_expand_query(DMARC_VERIFY_STATUS), | |
3567 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); | |
3568 | break; | |
3569 | #endif | |
3570 | ||
059ec3d9 | 3571 | case ACLC_DNSLISTS: |
379ba7d0 | 3572 | rc = verify_check_dnsbl(where, &arg, log_msgptr); |
059ec3d9 PH |
3573 | break; |
3574 | ||
3575 | case ACLC_DOMAINS: | |
3576 | rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor, | |
55414b25 | 3577 | addr->domain_cache, MCL_DOMAIN, TRUE, CUSS &deliver_domain_data); |
059ec3d9 PH |
3578 | break; |
3579 | ||
3580 | /* The value in tls_cipher is the full cipher name, for example, | |
3581 | TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the | |
3582 | cipher names such as DES-CBC3-SHA. But program defensively. We don't know | |
3583 | what may in practice come out of the SSL library - which at the time of | |
3584 | writing is poorly documented. */ | |
3585 | ||
3586 | case ACLC_ENCRYPTED: | |
817d9f57 | 3587 | if (tls_in.cipher == NULL) rc = FAIL; else |
059ec3d9 PH |
3588 | { |
3589 | uschar *endcipher = NULL; | |
817d9f57 JH |
3590 | uschar *cipher = Ustrchr(tls_in.cipher, ':'); |
3591 | if (cipher == NULL) cipher = tls_in.cipher; else | |
059ec3d9 PH |
3592 | { |
3593 | endcipher = Ustrchr(++cipher, ':'); | |
3594 | if (endcipher != NULL) *endcipher = 0; | |
3595 | } | |
3596 | rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL); | |
3597 | if (endcipher != NULL) *endcipher = ':'; | |
3598 | } | |
3599 | break; | |
3600 | ||
3601 | /* Use verify_check_this_host() instead of verify_check_host() so that | |
3602 | we can pass over &host_data to catch any looked up data. Once it has been | |
3603 | set, it retains its value so that it's still there if another ACL verb | |
3604 | comes through here and uses the cache. However, we must put it into | |
3605 | permanent store in case it is also expected to be used in a subsequent | |
3606 | message in the same SMTP connection. */ | |
3607 | ||
3608 | case ACLC_HOSTS: | |
3609 | rc = verify_check_this_host(&arg, sender_host_cache, NULL, | |
55414b25 JH |
3610 | (sender_host_address == NULL)? US"" : sender_host_address, |
3611 | CUSS &host_data); | |
4a452c43 JH |
3612 | if (rc == DEFER) *log_msgptr = search_error_message; |
3613 | if (host_data) host_data = string_copy_malloc(host_data); | |
059ec3d9 PH |
3614 | break; |
3615 | ||
3616 | case ACLC_LOCAL_PARTS: | |
3617 | rc = match_isinlist(addr->cc_local_part, &arg, 0, | |
3618 | &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE, | |
55414b25 | 3619 | CUSS &deliver_localpart_data); |
059ec3d9 PH |
3620 | break; |
3621 | ||
6ea85e9a PH |
3622 | case ACLC_LOG_REJECT_TARGET: |
3623 | { | |
3624 | int logbits = 0; | |
3625 | int sep = 0; | |
55414b25 | 3626 | const uschar *s = arg; |
6ea85e9a | 3627 | uschar *ss; |
4a452c43 | 3628 | while ((ss = string_nextinlist(&s, &sep, big_buffer, big_buffer_size))) |
6ea85e9a PH |
3629 | { |
3630 | if (Ustrcmp(ss, "main") == 0) logbits |= LOG_MAIN; | |
3631 | else if (Ustrcmp(ss, "panic") == 0) logbits |= LOG_PANIC; | |
3632 | else if (Ustrcmp(ss, "reject") == 0) logbits |= LOG_REJECT; | |
3633 | else | |
3634 | { | |
3635 | logbits |= LOG_MAIN|LOG_REJECT; | |
3636 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown log name \"%s\" in " | |
3637 | "\"log_reject_target\" in %s ACL", ss, acl_wherenames[where]); | |
3638 | } | |
3639 | } | |
3640 | log_reject_target = logbits; | |
3641 | } | |
3642 | break; | |
3643 | ||
059ec3d9 PH |
3644 | case ACLC_LOGWRITE: |
3645 | { | |
3646 | int logbits = 0; | |
55414b25 | 3647 | const uschar *s = arg; |
059ec3d9 PH |
3648 | if (*s == ':') |
3649 | { | |
3650 | s++; | |
3651 | while (*s != ':') | |
3652 | { | |
3653 | if (Ustrncmp(s, "main", 4) == 0) | |
3654 | { logbits |= LOG_MAIN; s += 4; } | |
3655 | else if (Ustrncmp(s, "panic", 5) == 0) | |
3656 | { logbits |= LOG_PANIC; s += 5; } | |
3657 | else if (Ustrncmp(s, "reject", 6) == 0) | |
3658 | { logbits |= LOG_REJECT; s += 6; } | |
3659 | else | |
3660 | { | |
3661 | logbits = LOG_MAIN|LOG_PANIC; | |
3662 | s = string_sprintf(":unknown log name in \"%s\" in " | |
3663 | "\"logwrite\" in %s ACL", arg, acl_wherenames[where]); | |
3664 | } | |
3665 | if (*s == ',') s++; | |
3666 | } | |
3667 | s++; | |
3668 | } | |
3669 | while (isspace(*s)) s++; | |
6ea85e9a PH |
3670 | |
3671 | ||
059ec3d9 PH |
3672 | if (logbits == 0) logbits = LOG_MAIN; |
3673 | log_write(0, logbits, "%s", string_printing(s)); | |
3674 | } | |
3675 | break; | |
8e669ac1 | 3676 | |
71fafd95 | 3677 | #ifdef WITH_CONTENT_SCAN |
0f0c8159 | 3678 | case ACLC_MALWARE: /* Run the malware backend. */ |
8523533c | 3679 | { |
6ea85e9a | 3680 | /* Separate the regular expression and any optional parameters. */ |
55414b25 JH |
3681 | const uschar * list = arg; |
3682 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
0f0c8159 JH |
3683 | uschar *opt; |
3684 | BOOL defer_ok = FALSE; | |
3685 | int timeout = 0; | |
3686 | ||
55414b25 | 3687 | while ((opt = string_nextinlist(&list, &sep, NULL, 0))) |
0f0c8159 JH |
3688 | if (strcmpic(opt, US"defer_ok") == 0) |
3689 | defer_ok = TRUE; | |
3690 | else if ( strncmpic(opt, US"tmo=", 4) == 0 | |
3691 | && (timeout = readconf_readtime(opt+4, '\0', FALSE)) < 0 | |
3692 | ) | |
3693 | { | |
3694 | *log_msgptr = string_sprintf("bad timeout value in '%s'", opt); | |
3695 | return ERROR; | |
3696 | } | |
3697 | ||
3698 | rc = malware(ss, timeout); | |
3699 | if (rc == DEFER && defer_ok) | |
3700 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ | |
8523533c TK |
3701 | } |
3702 | break; | |
3703 | ||
3704 | case ACLC_MIME_REGEX: | |
71fafd95 | 3705 | rc = mime_regex(&arg); |
8523533c | 3706 | break; |
71fafd95 | 3707 | #endif |
059ec3d9 | 3708 | |
870f6ba8 | 3709 | case ACLC_RATELIMIT: |
90fc3069 | 3710 | rc = acl_ratelimit(arg, where, log_msgptr); |
870f6ba8 TF |
3711 | break; |
3712 | ||
059ec3d9 | 3713 | case ACLC_RECIPIENTS: |
55414b25 JH |
3714 | rc = match_address_list((const uschar *)addr->address, TRUE, TRUE, &arg, NULL, -1, 0, |
3715 | CUSS &recipient_data); | |
059ec3d9 PH |
3716 | break; |
3717 | ||
71fafd95 PH |
3718 | #ifdef WITH_CONTENT_SCAN |
3719 | case ACLC_REGEX: | |
3720 | rc = regex(&arg); | |
8523533c | 3721 | break; |
71fafd95 | 3722 | #endif |
8523533c | 3723 | |
e7568d51 TL |
3724 | case ACLC_REMOVE_HEADER: |
3725 | setup_remove_header(arg); | |
3726 | break; | |
3727 | ||
059ec3d9 PH |
3728 | case ACLC_SENDER_DOMAINS: |
3729 | { | |
3730 | uschar *sdomain; | |
3731 | sdomain = Ustrrchr(sender_address, '@'); | |
3732 | sdomain = (sdomain == NULL)? US"" : sdomain + 1; | |
3733 | rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor, | |
3734 | sender_domain_cache, MCL_DOMAIN, TRUE, NULL); | |
3735 | } | |
3736 | break; | |
3737 | ||
3738 | case ACLC_SENDERS: | |
55414b25 JH |
3739 | rc = match_address_list((const uschar *)sender_address, TRUE, TRUE, &arg, |
3740 | sender_address_cache, -1, 0, CUSS &sender_data); | |
059ec3d9 PH |
3741 | break; |
3742 | ||
3743 | /* Connection variables must persist forever */ | |
3744 | ||
3745 | case ACLC_SET: | |
3746 | { | |
3747 | int old_pool = store_pool; | |
5ef5dd52 | 3748 | if ( cb->u.varname[0] == 'c' |
0cbf2b82 | 3749 | #ifndef DISABLE_EVENT |
5ef5dd52 JB |
3750 | || event_name /* An event is being delivered */ |
3751 | #endif | |
3752 | ) | |
3753 | store_pool = POOL_PERM; | |
38a0a95f | 3754 | acl_var_create(cb->u.varname)->data.ptr = string_copy(arg); |
059ec3d9 PH |
3755 | store_pool = old_pool; |
3756 | } | |
3757 | break; | |
3758 | ||
71fafd95 | 3759 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3760 | case ACLC_SPAM: |
3761 | { | |
3762 | /* Seperate the regular expression and any optional parameters. */ | |
55414b25 JH |
3763 | const uschar * list = arg; |
3764 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
8523533c | 3765 | /* Run the spam backend. */ |
55414b25 | 3766 | rc = spam(CUSS &ss); |
8523533c | 3767 | /* Modify return code based upon the existance of options. */ |
55414b25 | 3768 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) |
8523533c TK |
3769 | != NULL) { |
3770 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
3771 | { | |
3772 | /* FAIL so that the message is passed to the next ACL */ | |
3773 | rc = FAIL; | |
3774 | } | |
3775 | } | |
3776 | } | |
3777 | break; | |
71fafd95 | 3778 | #endif |
8523533c | 3779 | |
71fafd95 | 3780 | #ifdef EXPERIMENTAL_SPF |
8523533c | 3781 | case ACLC_SPF: |
65a7d8c3 NM |
3782 | rc = spf_process(&arg, sender_address, SPF_PROCESS_NORMAL); |
3783 | break; | |
3784 | case ACLC_SPF_GUESS: | |
3785 | rc = spf_process(&arg, sender_address, SPF_PROCESS_GUESS); | |
8523533c | 3786 | break; |
71fafd95 | 3787 | #endif |
8523533c | 3788 | |
b0019c78 TF |
3789 | case ACLC_UDPSEND: |
3790 | rc = acl_udpsend(arg, log_msgptr); | |
3791 | break; | |
3792 | ||
059ec3d9 PH |
3793 | /* If the verb is WARN, discard any user message from verification, because |
3794 | such messages are SMTP responses, not header additions. The latter come | |
475fe28a PH |
3795 | only from explicit "message" modifiers. However, put the user message into |
3796 | $acl_verify_message so it can be used in subsequent conditions or modifiers | |
3797 | (until something changes it). */ | |
059ec3d9 PH |
3798 | |
3799 | case ACLC_VERIFY: | |
3800 | rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno); | |
3703d818 JH |
3801 | if (*user_msgptr) |
3802 | acl_verify_message = *user_msgptr; | |
059ec3d9 PH |
3803 | if (verb == ACL_WARN) *user_msgptr = NULL; |
3804 | break; | |
3805 | ||
3806 | default: | |
3807 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown " | |
3808 | "condition %d", cb->type); | |
3809 | break; | |
3810 | } | |
3811 | ||
3812 | /* If a condition was negated, invert OK/FAIL. */ | |
3813 | ||
3814 | if (!cond_modifiers[cb->type] && cb->u.negated) | |
3815 | { | |
3816 | if (rc == OK) rc = FAIL; | |
3817 | else if (rc == FAIL || rc == FAIL_DROP) rc = OK; | |
3818 | } | |
3819 | ||
3820 | if (rc != OK) break; /* Conditions loop */ | |
3821 | } | |
3822 | ||
3823 | ||
3824 | /* If the result is the one for which "message" and/or "log_message" are used, | |
4e88a19f PH |
3825 | handle the values of these modifiers. If there isn't a log message set, we make |
3826 | it the same as the user message. | |
059ec3d9 PH |
3827 | |
3828 | "message" is a user message that will be included in an SMTP response. Unless | |
3829 | it is empty, it overrides any previously set user message. | |
3830 | ||
3831 | "log_message" is a non-user message, and it adds to any existing non-user | |
3832 | message that is already set. | |
3833 | ||
4e88a19f PH |
3834 | Most verbs have but a single return for which the messages are relevant, but |
3835 | for "discard", it's useful to have the log message both when it succeeds and | |
3836 | when it fails. For "accept", the message is used in the OK case if there is no | |
3837 | "endpass", but (for backwards compatibility) in the FAIL case if "endpass" is | |
3838 | present. */ | |
059ec3d9 | 3839 | |
4e88a19f PH |
3840 | if (*epp && rc == OK) user_message = NULL; |
3841 | ||
3842 | if (((1<<rc) & msgcond[verb]) != 0) | |
059ec3d9 PH |
3843 | { |
3844 | uschar *expmessage; | |
4e88a19f PH |
3845 | uschar *old_user_msgptr = *user_msgptr; |
3846 | uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr; | |
059ec3d9 PH |
3847 | |
3848 | /* If the verb is "warn", messages generated by conditions (verification or | |
4e88a19f PH |
3849 | nested ACLs) are always discarded. This also happens for acceptance verbs |
3850 | when they actually do accept. Only messages specified at this level are used. | |
059ec3d9 PH |
3851 | However, the value of an existing message is available in $acl_verify_message |
3852 | during expansions. */ | |
3853 | ||
4e88a19f PH |
3854 | if (verb == ACL_WARN || |
3855 | (rc == OK && (verb == ACL_ACCEPT || verb == ACL_DISCARD))) | |
3856 | *log_msgptr = *user_msgptr = NULL; | |
059ec3d9 PH |
3857 | |
3858 | if (user_message != NULL) | |
3859 | { | |
3860 | acl_verify_message = old_user_msgptr; | |
3861 | expmessage = expand_string(user_message); | |
3862 | if (expmessage == NULL) | |
3863 | { | |
3864 | if (!expand_string_forcedfail) | |
3865 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3866 | user_message, expand_string_message); | |
3867 | } | |
3868 | else if (expmessage[0] != 0) *user_msgptr = expmessage; | |
3869 | } | |
3870 | ||
3871 | if (log_message != NULL) | |
3872 | { | |
3873 | acl_verify_message = old_log_msgptr; | |
3874 | expmessage = expand_string(log_message); | |
3875 | if (expmessage == NULL) | |
3876 | { | |
3877 | if (!expand_string_forcedfail) | |
3878 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3879 | log_message, expand_string_message); | |
3880 | } | |
3881 | else if (expmessage[0] != 0) | |
3882 | { | |
3883 | *log_msgptr = (*log_msgptr == NULL)? expmessage : | |
3884 | string_sprintf("%s: %s", expmessage, *log_msgptr); | |
3885 | } | |
3886 | } | |
3887 | ||
3888 | /* If no log message, default it to the user message */ | |
3889 | ||
3890 | if (*log_msgptr == NULL) *log_msgptr = *user_msgptr; | |
3891 | } | |
3892 | ||
3893 | acl_verify_message = NULL; | |
3894 | return rc; | |
3895 | } | |
3896 | ||
3897 | ||
3898 | ||
3899 | ||
3900 | ||
3901 | /************************************************* | |
3902 | * Get line from a literal ACL * | |
3903 | *************************************************/ | |
3904 | ||
3905 | /* This function is passed to acl_read() in order to extract individual lines | |
3906 | of a literal ACL, which we access via static pointers. We can destroy the | |
3907 | contents because this is called only once (the compiled ACL is remembered). | |
3908 | ||
3909 | This code is intended to treat the data in the same way as lines in the main | |
3910 | Exim configuration file. That is: | |
3911 | ||
3912 | . Leading spaces are ignored. | |
3913 | ||
3914 | . A \ at the end of a line is a continuation - trailing spaces after the \ | |
3915 | are permitted (this is because I don't believe in making invisible things | |
3916 | significant). Leading spaces on the continued part of a line are ignored. | |
3917 | ||
3918 | . Physical lines starting (significantly) with # are totally ignored, and | |
3919 | may appear within a sequence of backslash-continued lines. | |
3920 | ||
3921 | . Blank lines are ignored, but will end a sequence of continuations. | |
3922 | ||
3923 | Arguments: none | |
3924 | Returns: a pointer to the next line | |
3925 | */ | |
3926 | ||
3927 | ||
3928 | static uschar *acl_text; /* Current pointer in the text */ | |
3929 | static uschar *acl_text_end; /* Points one past the terminating '0' */ | |
3930 | ||
3931 | ||
3932 | static uschar * | |
3933 | acl_getline(void) | |
3934 | { | |
3935 | uschar *yield; | |
3936 | ||
3937 | /* This loop handles leading blank lines and comments. */ | |
3938 | ||
3939 | for(;;) | |
3940 | { | |
3941 | while (isspace(*acl_text)) acl_text++; /* Leading spaces/empty lines */ | |
3942 | if (*acl_text == 0) return NULL; /* No more data */ | |
3943 | yield = acl_text; /* Potential data line */ | |
3944 | ||
3945 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3946 | ||
3947 | /* If we hit the end before a newline, we have the whole logical line. If | |
3948 | it's a comment, there's no more data to be given. Otherwise, yield it. */ | |
3949 | ||
3950 | if (*acl_text == 0) return (*yield == '#')? NULL : yield; | |
3951 | ||
3952 | /* After reaching a newline, end this loop if the physical line does not | |
3953 | start with '#'. If it does, it's a comment, and the loop continues. */ | |
3954 | ||
3955 | if (*yield != '#') break; | |
3956 | } | |
3957 | ||
3958 | /* This loop handles continuations. We know we have some real data, ending in | |
3959 | newline. See if there is a continuation marker at the end (ignoring trailing | |
3960 | white space). We know that *yield is not white space, so no need to test for | |
3961 | cont > yield in the backwards scanning loop. */ | |
3962 | ||
3963 | for(;;) | |
3964 | { | |
3965 | uschar *cont; | |
3966 | for (cont = acl_text - 1; isspace(*cont); cont--); | |
3967 | ||
3968 | /* If no continuation follows, we are done. Mark the end of the line and | |
3969 | return it. */ | |
3970 | ||
3971 | if (*cont != '\\') | |
3972 | { | |
3973 | *acl_text++ = 0; | |
3974 | return yield; | |
3975 | } | |
3976 | ||
3977 | /* We have encountered a continuation. Skip over whitespace at the start of | |
3978 | the next line, and indeed the whole of the next line or lines if they are | |
3979 | comment lines. */ | |
3980 | ||
3981 | for (;;) | |
3982 | { | |
3983 | while (*(++acl_text) == ' ' || *acl_text == '\t'); | |
3984 | if (*acl_text != '#') break; | |
3985 | while (*(++acl_text) != 0 && *acl_text != '\n'); | |
3986 | } | |
3987 | ||
3988 | /* We have the start of a continuation line. Move all the rest of the data | |
3989 | to join onto the previous line, and then find its end. If the end is not a | |
3990 | newline, we are done. Otherwise loop to look for another continuation. */ | |
3991 | ||
3992 | memmove(cont, acl_text, acl_text_end - acl_text); | |
3993 | acl_text_end -= acl_text - cont; | |
3994 | acl_text = cont; | |
3995 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3996 | if (*acl_text == 0) return yield; | |
3997 | } | |
3998 | ||
3999 | /* Control does not reach here */ | |
4000 | } | |
4001 | ||
4002 | ||
4003 | ||
4004 | ||
4005 | ||
4006 | /************************************************* | |
4007 | * Check access using an ACL * | |
4008 | *************************************************/ | |
4009 | ||
4010 | /* This function is called from address_check. It may recurse via | |
4011 | acl_check_condition() - hence the use of a level to stop looping. The ACL is | |
4012 | passed as a string which is expanded. A forced failure implies no access check | |
4013 | is required. If the result is a single word, it is taken as the name of an ACL | |
4014 | which is sought in the global ACL tree. Otherwise, it is taken as literal ACL | |
4015 | text, complete with newlines, and parsed as such. In both cases, the ACL check | |
4016 | is then run. This function uses an auxiliary function for acl_read() to call | |
4017 | for reading individual lines of a literal ACL. This is acl_getline(), which | |
4018 | appears immediately above. | |
4019 | ||
4020 | Arguments: | |
4021 | where where called from | |
4022 | addr address item when called from RCPT; otherwise NULL | |
4023 | s the input string; NULL is the same as an empty ACL => DENY | |
4024 | level the nesting level | |
4025 | user_msgptr where to put a user error (for SMTP response) | |
4026 | log_msgptr where to put a logging message (not for SMTP response) | |
4027 | ||
4028 | Returns: OK access is granted | |
4029 | DISCARD access is apparently granted... | |
4030 | FAIL access is denied | |
4031 | FAIL_DROP access is denied; drop the connection | |
4032 | DEFER can't tell at the moment | |
4033 | ERROR disaster | |
4034 | */ | |
4035 | ||
4036 | static int | |
4037 | acl_check_internal(int where, address_item *addr, uschar *s, int level, | |
4038 | uschar **user_msgptr, uschar **log_msgptr) | |
4039 | { | |
4040 | int fd = -1; | |
4041 | acl_block *acl = NULL; | |
4042 | uschar *acl_name = US"inline ACL"; | |
4043 | uschar *ss; | |
4044 | ||
4045 | /* Catch configuration loops */ | |
4046 | ||
4047 | if (level > 20) | |
4048 | { | |
4049 | *log_msgptr = US"ACL nested too deep: possible loop"; | |
4050 | return ERROR; | |
4051 | } | |
4052 | ||
4053 | if (s == NULL) | |
4054 | { | |
4055 | HDEBUG(D_acl) debug_printf("ACL is NULL: implicit DENY\n"); | |
4056 | return FAIL; | |
4057 | } | |
4058 | ||
4059 | /* At top level, we expand the incoming string. At lower levels, it has already | |
4060 | been expanded as part of condition processing. */ | |
4061 | ||
4062 | if (level == 0) | |
4063 | { | |
4064 | ss = expand_string(s); | |
4065 | if (ss == NULL) | |
4066 | { | |
4067 | if (expand_string_forcedfail) return OK; | |
4068 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s, | |
4069 | expand_string_message); | |
4070 | return ERROR; | |
4071 | } | |
4072 | } | |
4073 | else ss = s; | |
4074 | ||
4075 | while (isspace(*ss))ss++; | |
4076 | ||
4077 | /* If we can't find a named ACL, the default is to parse it as an inline one. | |
4078 | (Unless it begins with a slash; non-existent files give rise to an error.) */ | |
4079 | ||
4080 | acl_text = ss; | |
4081 | ||
4082 | /* Handle the case of a string that does not contain any spaces. Look for a | |
4083 | named ACL among those read from the configuration, or a previously read file. | |
4084 | It is possible that the pointer to the ACL is NULL if the configuration | |
4085 | contains a name with no data. If not found, and the text begins with '/', | |
4086 | read an ACL from a file, and save it so it can be re-used. */ | |
4087 | ||
4088 | if (Ustrchr(ss, ' ') == NULL) | |
4089 | { | |
4090 | tree_node *t = tree_search(acl_anchor, ss); | |
4091 | if (t != NULL) | |
4092 | { | |
4093 | acl = (acl_block *)(t->data.ptr); | |
4094 | if (acl == NULL) | |
4095 | { | |
4096 | HDEBUG(D_acl) debug_printf("ACL \"%s\" is empty: implicit DENY\n", ss); | |
4097 | return FAIL; | |
4098 | } | |
4099 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
4100 | HDEBUG(D_acl) debug_printf("using ACL \"%s\"\n", ss); | |
4101 | } | |
4102 | ||
4103 | else if (*ss == '/') | |
4104 | { | |
4105 | struct stat statbuf; | |
4106 | fd = Uopen(ss, O_RDONLY, 0); | |
4107 | if (fd < 0) | |
4108 | { | |
4109 | *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss, | |
4110 | strerror(errno)); | |
4111 | return ERROR; | |
4112 | } | |
4113 | ||
4114 | if (fstat(fd, &statbuf) != 0) | |
4115 | { | |
4116 | *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss, | |
4117 | strerror(errno)); | |
4118 | return ERROR; | |
4119 | } | |
4120 | ||
4121 | acl_text = store_get(statbuf.st_size + 1); | |
4122 | acl_text_end = acl_text + statbuf.st_size + 1; | |
4123 | ||
4124 | if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size) | |
4125 | { | |
4126 | *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s", | |
4127 | ss, strerror(errno)); | |
4128 | return ERROR; | |
4129 | } | |
4130 | acl_text[statbuf.st_size] = 0; | |
f1e894f3 | 4131 | (void)close(fd); |
059ec3d9 PH |
4132 | |
4133 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
4134 | HDEBUG(D_acl) debug_printf("read ACL from file %s\n", ss); | |
4135 | } | |
4136 | } | |
4137 | ||
4138 | /* Parse an ACL that is still in text form. If it came from a file, remember it | |
4139 | in the ACL tree, having read it into the POOL_PERM store pool so that it | |
4140 | persists between multiple messages. */ | |
4141 | ||
4142 | if (acl == NULL) | |
4143 | { | |
4144 | int old_pool = store_pool; | |
4145 | if (fd >= 0) store_pool = POOL_PERM; | |
4146 | acl = acl_read(acl_getline, log_msgptr); | |
4147 | store_pool = old_pool; | |
4148 | if (acl == NULL && *log_msgptr != NULL) return ERROR; | |
4149 | if (fd >= 0) | |
4150 | { | |
4151 | tree_node *t = store_get_perm(sizeof(tree_node) + Ustrlen(ss)); | |
4152 | Ustrcpy(t->name, ss); | |
4153 | t->data.ptr = acl; | |
4154 | (void)tree_insertnode(&acl_anchor, t); | |
4155 | } | |
4156 | } | |
4157 | ||
4158 | /* Now we have an ACL to use. It's possible it may be NULL. */ | |
4159 | ||
4160 | while (acl != NULL) | |
4161 | { | |
4162 | int cond; | |
4163 | int basic_errno = 0; | |
4164 | BOOL endpass_seen = FALSE; | |
82c0c8ea JH |
4165 | BOOL acl_quit_check = level == 0 |
4166 | && (where == ACL_WHERE_QUIT || where == ACL_WHERE_NOTQUIT); | |
059ec3d9 PH |
4167 | |
4168 | *log_msgptr = *user_msgptr = NULL; | |
4169 | acl_temp_details = FALSE; | |
4170 | ||
059ec3d9 PH |
4171 | HDEBUG(D_acl) debug_printf("processing \"%s\"\n", verbs[acl->verb]); |
4172 | ||
4173 | /* Clear out any search error message from a previous check before testing | |
4174 | this condition. */ | |
4175 | ||
4176 | search_error_message = NULL; | |
4177 | cond = acl_check_condition(acl->verb, acl->condition, where, addr, level, | |
4178 | &endpass_seen, user_msgptr, log_msgptr, &basic_errno); | |
4179 | ||
4180 | /* Handle special returns: DEFER causes a return except on a WARN verb; | |
4181 | ERROR always causes a return. */ | |
4182 | ||
4183 | switch (cond) | |
4184 | { | |
4185 | case DEFER: | |
6968512f | 4186 | HDEBUG(D_acl) debug_printf("%s: condition test deferred in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4187 | if (basic_errno != ERRNO_CALLOUTDEFER) |
4188 | { | |
4189 | if (search_error_message != NULL && *search_error_message != 0) | |
4190 | *log_msgptr = search_error_message; | |
4191 | if (smtp_return_error_details) acl_temp_details = TRUE; | |
4192 | } | |
4193 | else | |
4194 | { | |
4195 | acl_temp_details = TRUE; | |
4196 | } | |
4197 | if (acl->verb != ACL_WARN) return DEFER; | |
4198 | break; | |
4199 | ||
4200 | default: /* Paranoia */ | |
4201 | case ERROR: | |
6968512f | 4202 | HDEBUG(D_acl) debug_printf("%s: condition test error in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4203 | return ERROR; |
4204 | ||
4205 | case OK: | |
6968512f JH |
4206 | HDEBUG(D_acl) debug_printf("%s: condition test succeeded in %s\n", |
4207 | verbs[acl->verb], acl_name); | |
059ec3d9 PH |
4208 | break; |
4209 | ||
4210 | case FAIL: | |
6968512f | 4211 | HDEBUG(D_acl) debug_printf("%s: condition test failed in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4212 | break; |
4213 | ||
4214 | /* DISCARD and DROP can happen only from a nested ACL condition, and | |
4215 | DISCARD can happen only for an "accept" or "discard" verb. */ | |
4216 | ||
4217 | case DISCARD: | |
6968512f JH |
4218 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"discard\" in %s\n", |
4219 | verbs[acl->verb], acl_name); | |
059ec3d9 PH |
4220 | break; |
4221 | ||
4222 | case FAIL_DROP: | |
6968512f JH |
4223 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"drop\" in %s\n", |
4224 | verbs[acl->verb], acl_name); | |
059ec3d9 PH |
4225 | break; |
4226 | } | |
4227 | ||
4228 | /* At this point, cond for most verbs is either OK or FAIL or (as a result of | |
4229 | a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and | |
4230 | for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */ | |
4231 | ||
4232 | switch(acl->verb) | |
4233 | { | |
4234 | case ACL_ACCEPT: | |
a7538db1 JH |
4235 | if (cond == OK || cond == DISCARD) |
4236 | { | |
4237 | HDEBUG(D_acl) debug_printf("end of %s: ACCEPT\n", acl_name); | |
4238 | return cond; | |
4239 | } | |
059ec3d9 PH |
4240 | if (endpass_seen) |
4241 | { | |
4242 | HDEBUG(D_acl) debug_printf("accept: endpass encountered - denying access\n"); | |
4243 | return cond; | |
4244 | } | |
4245 | break; | |
4246 | ||
4247 | case ACL_DEFER: | |
4248 | if (cond == OK) | |
4249 | { | |
a7538db1 | 4250 | HDEBUG(D_acl) debug_printf("end of %s: DEFER\n", acl_name); |
82c0c8ea | 4251 | if (acl_quit_check) goto badquit; |
059ec3d9 PH |
4252 | acl_temp_details = TRUE; |
4253 | return DEFER; | |
4254 | } | |
4255 | break; | |
4256 | ||
4257 | case ACL_DENY: | |
a7538db1 JH |
4258 | if (cond == OK) |
4259 | { | |
4260 | HDEBUG(D_acl) debug_printf("end of %s: DENY\n", acl_name); | |
82c0c8ea | 4261 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4262 | return FAIL; |
4263 | } | |
059ec3d9 PH |
4264 | break; |
4265 | ||
4266 | case ACL_DISCARD: | |
a7538db1 JH |
4267 | if (cond == OK || cond == DISCARD) |
4268 | { | |
4269 | HDEBUG(D_acl) debug_printf("end of %s: DISCARD\n", acl_name); | |
82c0c8ea | 4270 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4271 | return DISCARD; |
4272 | } | |
059ec3d9 PH |
4273 | if (endpass_seen) |
4274 | { | |
4275 | HDEBUG(D_acl) debug_printf("discard: endpass encountered - denying access\n"); | |
4276 | return cond; | |
4277 | } | |
4278 | break; | |
4279 | ||
4280 | case ACL_DROP: | |
a7538db1 JH |
4281 | if (cond == OK) |
4282 | { | |
4283 | HDEBUG(D_acl) debug_printf("end of %s: DROP\n", acl_name); | |
82c0c8ea | 4284 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4285 | return FAIL_DROP; |
4286 | } | |
059ec3d9 PH |
4287 | break; |
4288 | ||
4289 | case ACL_REQUIRE: | |
a7538db1 JH |
4290 | if (cond != OK) |
4291 | { | |
4292 | HDEBUG(D_acl) debug_printf("end of %s: not OK\n", acl_name); | |
82c0c8ea | 4293 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4294 | return cond; |
4295 | } | |
059ec3d9 PH |
4296 | break; |
4297 | ||
4298 | case ACL_WARN: | |
4299 | if (cond == OK) | |
4300 | acl_warn(where, *user_msgptr, *log_msgptr); | |
6c6d6e48 | 4301 | else if (cond == DEFER && LOGGING(acl_warn_skipped)) |
9c7a242c PH |
4302 | log_write(0, LOG_MAIN, "%s Warning: ACL \"warn\" statement skipped: " |
4303 | "condition test deferred%s%s", host_and_ident(TRUE), | |
4304 | (*log_msgptr == NULL)? US"" : US": ", | |
4305 | (*log_msgptr == NULL)? US"" : *log_msgptr); | |
059ec3d9 PH |
4306 | *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */ |
4307 | break; | |
4308 | ||
4309 | default: | |
4310 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d", | |
4311 | acl->verb); | |
4312 | break; | |
4313 | } | |
4314 | ||
4315 | /* Pass to the next ACL item */ | |
4316 | ||
4317 | acl = acl->next; | |
4318 | } | |
4319 | ||
4320 | /* We have reached the end of the ACL. This is an implicit DENY. */ | |
4321 | ||
4322 | HDEBUG(D_acl) debug_printf("end of %s: implicit DENY\n", acl_name); | |
4323 | return FAIL; | |
82c0c8ea JH |
4324 | |
4325 | badquit: | |
4326 | *log_msgptr = string_sprintf("QUIT or not-QUIT teplevel ACL may not fail " | |
4327 | "('%s' verb used incorrectly)", verbs[acl->verb]); | |
4328 | return ERROR; | |
059ec3d9 PH |
4329 | } |
4330 | ||
4331 | ||
333eea9c JH |
4332 | |
4333 | ||
4334 | /* Same args as acl_check_internal() above, but the string s is | |
4335 | the name of an ACL followed optionally by up to 9 space-separated arguments. | |
4336 | The name and args are separately expanded. Args go into $acl_arg globals. */ | |
f60d98e8 | 4337 | static int |
55414b25 | 4338 | acl_check_wargs(int where, address_item *addr, const uschar *s, int level, |
333eea9c JH |
4339 | uschar **user_msgptr, uschar **log_msgptr) |
4340 | { | |
4341 | uschar * tmp; | |
bef3ea7f | 4342 | uschar * tmp_arg[9]; /* must match acl_arg[] */ |
ef21c07d JH |
4343 | uschar * sav_arg[9]; /* must match acl_arg[] */ |
4344 | int sav_narg; | |
333eea9c | 4345 | uschar * name; |
bef3ea7f | 4346 | int i; |
ef21c07d | 4347 | int ret; |
333eea9c JH |
4348 | |
4349 | if (!(tmp = string_dequote(&s)) || !(name = expand_string(tmp))) | |
4350 | goto bad; | |
4351 | ||
bef3ea7f | 4352 | for (i = 0; i < 9; i++) |
333eea9c JH |
4353 | { |
4354 | while (*s && isspace(*s)) s++; | |
4355 | if (!*s) break; | |
bef3ea7f | 4356 | if (!(tmp = string_dequote(&s)) || !(tmp_arg[i] = expand_string(tmp))) |
333eea9c JH |
4357 | { |
4358 | tmp = name; | |
4359 | goto bad; | |
4360 | } | |
4361 | } | |
ef21c07d JH |
4362 | |
4363 | sav_narg = acl_narg; | |
bef3ea7f | 4364 | acl_narg = i; |
ef21c07d JH |
4365 | for (i = 0; i < acl_narg; i++) |
4366 | { | |
4367 | sav_arg[i] = acl_arg[i]; | |
4368 | acl_arg[i] = tmp_arg[i]; | |
4369 | } | |
4370 | while (i < 9) | |
4371 | { | |
4372 | sav_arg[i] = acl_arg[i]; | |
4373 | acl_arg[i++] = NULL; | |
4374 | } | |
4375 | ||
4376 | ret = acl_check_internal(where, addr, name, level, user_msgptr, log_msgptr); | |
333eea9c | 4377 | |
ef21c07d JH |
4378 | acl_narg = sav_narg; |
4379 | for (i = 0; i < 9; i++) acl_arg[i] = sav_arg[i]; | |
4380 | return ret; | |
333eea9c JH |
4381 | |
4382 | bad: | |
4383 | if (expand_string_forcedfail) return ERROR; | |
4384 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
4385 | tmp, expand_string_message); | |
4386 | return search_find_defer?DEFER:ERROR; | |
4387 | } | |
4388 | ||
4389 | ||
4390 | ||
059ec3d9 PH |
4391 | /************************************************* |
4392 | * Check access using an ACL * | |
4393 | *************************************************/ | |
4394 | ||
faa05a93 JH |
4395 | /* Alternate interface for ACL, used by expansions */ |
4396 | int | |
05caaeaa | 4397 | acl_eval(int where, uschar *s, uschar **user_msgptr, uschar **log_msgptr) |
faa05a93 | 4398 | { |
faa05a93 JH |
4399 | address_item adb; |
4400 | address_item *addr = NULL; | |
4401 | ||
4402 | *user_msgptr = *log_msgptr = NULL; | |
4403 | sender_verified_failed = NULL; | |
4404 | ratelimiters_cmd = NULL; | |
4405 | log_reject_target = LOG_MAIN|LOG_REJECT; | |
4406 | ||
4407 | if (where == ACL_WHERE_RCPT) | |
4408 | { | |
4409 | adb = address_defaults; | |
4410 | addr = &adb; | |
05caaeaa JH |
4411 | addr->address = expand_string(US"$local_part@$domain"); |
4412 | addr->domain = deliver_domain; | |
4413 | addr->local_part = deliver_localpart; | |
4414 | addr->cc_local_part = deliver_localpart; | |
4415 | addr->lc_local_part = deliver_localpart; | |
faa05a93 JH |
4416 | } |
4417 | ||
4418 | return acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr); | |
4419 | } | |
4420 | ||
4421 | ||
4422 | ||
059ec3d9 PH |
4423 | /* This is the external interface for ACL checks. It sets up an address and the |
4424 | expansions for $domain and $local_part when called after RCPT, then calls | |
4425 | acl_check_internal() to do the actual work. | |
4426 | ||
4427 | Arguments: | |
4428 | where ACL_WHERE_xxxx indicating where called from | |
64ffc24f | 4429 | recipient RCPT address for RCPT check, else NULL |
059ec3d9 PH |
4430 | s the input string; NULL is the same as an empty ACL => DENY |
4431 | user_msgptr where to put a user error (for SMTP response) | |
4432 | log_msgptr where to put a logging message (not for SMTP response) | |
4433 | ||
4434 | Returns: OK access is granted by an ACCEPT verb | |
4435 | DISCARD access is granted by a DISCARD verb | |
4436 | FAIL access is denied | |
4437 | FAIL_DROP access is denied; drop the connection | |
4438 | DEFER can't tell at the moment | |
4439 | ERROR disaster | |
4440 | */ | |
faa05a93 | 4441 | int acl_where = ACL_WHERE_UNKNOWN; |
059ec3d9 PH |
4442 | |
4443 | int | |
64ffc24f | 4444 | acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr, |
059ec3d9 PH |
4445 | uschar **log_msgptr) |
4446 | { | |
4447 | int rc; | |
4448 | address_item adb; | |
64ffc24f | 4449 | address_item *addr = NULL; |
059ec3d9 PH |
4450 | |
4451 | *user_msgptr = *log_msgptr = NULL; | |
4452 | sender_verified_failed = NULL; | |
fe0dab11 | 4453 | ratelimiters_cmd = NULL; |
6ea85e9a | 4454 | log_reject_target = LOG_MAIN|LOG_REJECT; |
059ec3d9 | 4455 | |
8ccd00b1 | 4456 | #ifndef DISABLE_PRDR |
5032d1cf | 4457 | if (where == ACL_WHERE_RCPT || where == ACL_WHERE_PRDR) |
fd98a5c6 | 4458 | #else |
5032d1cf | 4459 | if (where == ACL_WHERE_RCPT) |
fd98a5c6 | 4460 | #endif |
059ec3d9 PH |
4461 | { |
4462 | adb = address_defaults; | |
4463 | addr = &adb; | |
64ffc24f | 4464 | addr->address = recipient; |
059ec3d9 PH |
4465 | if (deliver_split_address(addr) == DEFER) |
4466 | { | |
4467 | *log_msgptr = US"defer in percent_hack_domains check"; | |
4468 | return DEFER; | |
4469 | } | |
8c5d388a | 4470 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
4471 | if ((addr->prop.utf8_msg = message_smtputf8)) |
4472 | { | |
4473 | addr->prop.utf8_downcvt = message_utf8_downconvert == 1; | |
4474 | addr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1; | |
4475 | } | |
9bfc60eb | 4476 | #endif |
059ec3d9 PH |
4477 | deliver_domain = addr->domain; |
4478 | deliver_localpart = addr->local_part; | |
4479 | } | |
059ec3d9 | 4480 | |
faa05a93 | 4481 | acl_where = where; |
059ec3d9 | 4482 | rc = acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr); |
faa05a93 | 4483 | acl_where = ACL_WHERE_UNKNOWN; |
059ec3d9 | 4484 | |
817d9f57 JH |
4485 | /* Cutthrough - if requested, |
4486 | and WHERE_RCPT and not yet opened conn as result of recipient-verify, | |
4487 | and rcpt acl returned accept, | |
4488 | and first recipient (cancel on any subsequents) | |
e4bdf652 | 4489 | open one now and run it up to RCPT acceptance. |
e4bdf652 | 4490 | A failed verify should cancel cutthrough request. |
e4bdf652 | 4491 | |
817d9f57 | 4492 | Initial implementation: dual-write to spool. |
e4bdf652 JH |
4493 | Assume the rxd datastream is now being copied byte-for-byte to an open cutthrough connection. |
4494 | ||
4495 | Cease cutthrough copy on rxd final dot; do not send one. | |
4496 | ||
4497 | On a data acl, if not accept and a cutthrough conn is open, hard-close it (no SMTP niceness). | |
4498 | ||
4499 | On data acl accept, terminate the dataphase on an open cutthrough conn. If accepted or | |
4500 | perm-rejected, reflect that to the original sender - and dump the spooled copy. | |
4501 | If temp-reject, close the conn (and keep the spooled copy). | |
4502 | If conn-failure, no action (and keep the spooled copy). | |
e4bdf652 JH |
4503 | */ |
4504 | switch (where) | |
4505 | { | |
4506 | case ACL_WHERE_RCPT: | |
8ccd00b1 | 4507 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
4508 | case ACL_WHERE_PRDR: |
4509 | #endif | |
5032d1cf | 4510 | if (rc == OK && cutthrough.delivery && rcpt_count > cutthrough.nrcpt) |
e4bdf652 JH |
4511 | open_cutthrough_connection(addr); |
4512 | break; | |
4513 | ||
4514 | case ACL_WHERE_PREDATA: | |
4515 | if( rc == OK ) | |
4516 | cutthrough_predata(); | |
4517 | else | |
2e5b33cd | 4518 | cancel_cutthrough_connection("predata acl not ok"); |
e4bdf652 JH |
4519 | break; |
4520 | ||
4521 | case ACL_WHERE_QUIT: | |
4522 | case ACL_WHERE_NOTQUIT: | |
2e5b33cd | 4523 | cancel_cutthrough_connection("quit or notquit"); |
e4bdf652 JH |
4524 | break; |
4525 | ||
4526 | default: | |
4527 | break; | |
4528 | } | |
4529 | ||
64ffc24f PH |
4530 | deliver_domain = deliver_localpart = deliver_address_data = |
4531 | sender_address_data = NULL; | |
059ec3d9 PH |
4532 | |
4533 | /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA | |
4534 | ACL, which is really in the middle of an SMTP command. */ | |
4535 | ||
4536 | if (rc == DISCARD) | |
4537 | { | |
4538 | if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA) | |
4539 | { | |
4540 | log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s " | |
4541 | "ACL", acl_wherenames[where]); | |
4542 | return ERROR; | |
4543 | } | |
4544 | return DISCARD; | |
4545 | } | |
4546 | ||
4547 | /* A DROP response is not permitted from MAILAUTH */ | |
4548 | ||
4549 | if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH) | |
4550 | { | |
4551 | log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s " | |
4552 | "ACL", acl_wherenames[where]); | |
4553 | return ERROR; | |
4554 | } | |
4555 | ||
4e88a19f PH |
4556 | /* Before giving a response, take a look at the length of any user message, and |
4557 | split it up into multiple lines if possible. */ | |
059ec3d9 | 4558 | |
e28326d8 PH |
4559 | *user_msgptr = string_split_message(*user_msgptr); |
4560 | if (fake_response != OK) | |
4561 | fake_response_text = string_split_message(fake_response_text); | |
059ec3d9 PH |
4562 | |
4563 | return rc; | |
4564 | } | |
4565 | ||
38a0a95f | 4566 | |
38a0a95f PH |
4567 | /************************************************* |
4568 | * Create ACL variable * | |
4569 | *************************************************/ | |
4570 | ||
4571 | /* Create an ACL variable or reuse an existing one. ACL variables are in a | |
4572 | binary tree (see tree.c) with acl_var_c and acl_var_m as root nodes. | |
4573 | ||
4574 | Argument: | |
4575 | name pointer to the variable's name, starting with c or m | |
4576 | ||
4577 | Returns the pointer to variable's tree node | |
4578 | */ | |
4579 | ||
4580 | tree_node * | |
4581 | acl_var_create(uschar *name) | |
4582 | { | |
4583 | tree_node *node, **root; | |
4584 | root = (name[0] == 'c')? &acl_var_c : &acl_var_m; | |
4585 | node = tree_search(*root, name); | |
4586 | if (node == NULL) | |
4587 | { | |
4588 | node = store_get(sizeof(tree_node) + Ustrlen(name)); | |
4589 | Ustrcpy(node->name, name); | |
4590 | (void)tree_insertnode(root, node); | |
4591 | } | |
4592 | node->data.ptr = NULL; | |
4593 | return node; | |
4594 | } | |
4595 | ||
4596 | ||
4597 | ||
4598 | /************************************************* | |
4599 | * Write an ACL variable in spool format * | |
4600 | *************************************************/ | |
4601 | ||
4602 | /* This function is used as a callback for tree_walk when writing variables to | |
4603 | the spool file. To retain spool file compatibility, what is written is -aclc or | |
4604 | -aclm followed by the rest of the name and the data length, space separated, | |
4605 | then the value itself, starting on a new line, and terminated by an additional | |
4606 | newline. When we had only numbered ACL variables, the first line might look | |
4607 | like this: "-aclc 5 20". Now it might be "-aclc foo 20" for the variable called | |
4608 | acl_cfoo. | |
4609 | ||
4610 | Arguments: | |
4611 | name of the variable | |
4612 | value of the variable | |
4613 | ctx FILE pointer (as a void pointer) | |
4614 | ||
4615 | Returns: nothing | |
4616 | */ | |
4617 | ||
4618 | void | |
4619 | acl_var_write(uschar *name, uschar *value, void *ctx) | |
4620 | { | |
4621 | FILE *f = (FILE *)ctx; | |
4622 | fprintf(f, "-acl%c %s %d\n%s\n", name[0], name+1, Ustrlen(value), value); | |
4623 | } | |
4624 | ||
9171d434 JH |
4625 | /* vi: aw ai sw=2 |
4626 | */ | |
059ec3d9 | 4627 | /* End of acl.c */ |