Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
c4ceed07 | 5 | /* Copyright (c) University of Cambridge 1995 - 2012 */ |
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 | ||
24 | static uschar *verbs[] = | |
25 | { US"accept", US"defer", US"deny", US"discard", US"drop", US"require", | |
26 | US"warn" }; | |
27 | ||
4e88a19f PH |
28 | /* For each verb, the conditions for which "message" or "log_message" are used |
29 | are held as a bitmap. This is to avoid expanding the strings unnecessarily. For | |
30 | "accept", the FAIL case is used only after "endpass", but that is selected in | |
31 | the code. */ | |
32 | ||
33 | static int msgcond[] = { | |
34 | (1<<OK) | (1<<FAIL) | (1<<FAIL_DROP), /* accept */ | |
35 | (1<<OK), /* defer */ | |
36 | (1<<OK), /* deny */ | |
37 | (1<<OK) | (1<<FAIL) | (1<<FAIL_DROP), /* discard */ | |
38 | (1<<OK), /* drop */ | |
39 | (1<<FAIL) | (1<<FAIL_DROP), /* require */ | |
40 | (1<<OK) /* warn */ | |
41 | }; | |
059ec3d9 PH |
42 | |
43 | /* ACL condition and modifier codes - keep in step with the table that | |
71fafd95 PH |
44 | follows, and the cond_expand_at_top and uschar cond_modifiers tables lower |
45 | down. */ | |
059ec3d9 | 46 | |
71fafd95 PH |
47 | enum { ACLC_ACL, |
48 | ACLC_ADD_HEADER, | |
49 | ACLC_AUTHENTICATED, | |
8523533c TK |
50 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
51 | ACLC_BMI_OPTIN, | |
52 | #endif | |
71fafd95 | 53 | ACLC_CONDITION, |
c3611384 | 54 | ACLC_CONTINUE, |
71fafd95 | 55 | ACLC_CONTROL, |
6a8f9482 TK |
56 | #ifdef EXPERIMENTAL_DCC |
57 | ACLC_DCC, | |
58 | #endif | |
8523533c TK |
59 | #ifdef WITH_CONTENT_SCAN |
60 | ACLC_DECODE, | |
61 | #endif | |
62 | ACLC_DELAY, | |
63 | #ifdef WITH_OLD_DEMIME | |
64 | ACLC_DEMIME, | |
fb2274d4 | 65 | #endif |
80a47a2c TK |
66 | #ifndef DISABLE_DKIM |
67 | ACLC_DKIM_SIGNER, | |
68 | ACLC_DKIM_STATUS, | |
8e669ac1 | 69 | #endif |
71fafd95 PH |
70 | ACLC_DNSLISTS, |
71 | ACLC_DOMAINS, | |
72 | ACLC_ENCRYPTED, | |
73 | ACLC_ENDPASS, | |
74 | ACLC_HOSTS, | |
75 | ACLC_LOCAL_PARTS, | |
76 | ACLC_LOG_MESSAGE, | |
6ea85e9a | 77 | ACLC_LOG_REJECT_TARGET, |
71fafd95 | 78 | ACLC_LOGWRITE, |
8523533c TK |
79 | #ifdef WITH_CONTENT_SCAN |
80 | ACLC_MALWARE, | |
81 | #endif | |
82 | ACLC_MESSAGE, | |
83 | #ifdef WITH_CONTENT_SCAN | |
84 | ACLC_MIME_REGEX, | |
85 | #endif | |
870f6ba8 | 86 | ACLC_RATELIMIT, |
8523533c TK |
87 | ACLC_RECIPIENTS, |
88 | #ifdef WITH_CONTENT_SCAN | |
89 | ACLC_REGEX, | |
90 | #endif | |
e7568d51 | 91 | ACLC_REMOVE_HEADER, |
71fafd95 PH |
92 | ACLC_SENDER_DOMAINS, |
93 | ACLC_SENDERS, | |
94 | ACLC_SET, | |
8523533c | 95 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 96 | ACLC_SPAM, |
8523533c TK |
97 | #endif |
98 | #ifdef EXPERIMENTAL_SPF | |
99 | ACLC_SPF, | |
65a7d8c3 | 100 | ACLC_SPF_GUESS, |
8523533c TK |
101 | #endif |
102 | ACLC_VERIFY }; | |
059ec3d9 | 103 | |
c3611384 PH |
104 | /* ACL conditions/modifiers: "delay", "control", "continue", "endpass", |
105 | "message", "log_message", "log_reject_target", "logwrite", and "set" are | |
106 | modifiers that look like conditions but always return TRUE. They are used for | |
107 | their side effects. */ | |
059ec3d9 | 108 | |
9a26b6b2 PH |
109 | static uschar *conditions[] = { |
110 | US"acl", | |
71fafd95 | 111 | US"add_header", |
9a26b6b2 | 112 | US"authenticated", |
8523533c TK |
113 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
114 | US"bmi_optin", | |
115 | #endif | |
116 | US"condition", | |
c3611384 | 117 | US"continue", |
8e669ac1 | 118 | US"control", |
6a8f9482 TK |
119 | #ifdef EXPERIMENTAL_DCC |
120 | US"dcc", | |
121 | #endif | |
8523533c TK |
122 | #ifdef WITH_CONTENT_SCAN |
123 | US"decode", | |
124 | #endif | |
125 | US"delay", | |
126 | #ifdef WITH_OLD_DEMIME | |
127 | US"demime", | |
fb2274d4 | 128 | #endif |
80a47a2c TK |
129 | #ifndef DISABLE_DKIM |
130 | US"dkim_signers", | |
131 | US"dkim_status", | |
8523533c | 132 | #endif |
6ea85e9a PH |
133 | US"dnslists", |
134 | US"domains", | |
135 | US"encrypted", | |
136 | US"endpass", | |
137 | US"hosts", | |
138 | US"local_parts", | |
139 | US"log_message", | |
140 | US"log_reject_target", | |
141 | US"logwrite", | |
8523533c TK |
142 | #ifdef WITH_CONTENT_SCAN |
143 | US"malware", | |
144 | #endif | |
145 | US"message", | |
146 | #ifdef WITH_CONTENT_SCAN | |
147 | US"mime_regex", | |
148 | #endif | |
870f6ba8 | 149 | US"ratelimit", |
8523533c TK |
150 | US"recipients", |
151 | #ifdef WITH_CONTENT_SCAN | |
152 | US"regex", | |
153 | #endif | |
e7568d51 | 154 | US"remove_header", |
8523533c TK |
155 | US"sender_domains", US"senders", US"set", |
156 | #ifdef WITH_CONTENT_SCAN | |
157 | US"spam", | |
158 | #endif | |
159 | #ifdef EXPERIMENTAL_SPF | |
160 | US"spf", | |
65a7d8c3 | 161 | US"spf_guess", |
8523533c | 162 | #endif |
059ec3d9 | 163 | US"verify" }; |
8e669ac1 | 164 | |
c5fcb476 | 165 | |
9a26b6b2 PH |
166 | /* Return values from decode_control(); keep in step with the table of names |
167 | that follows! */ | |
168 | ||
169 | enum { | |
c46782ef PH |
170 | CONTROL_AUTH_UNADVERTISED, |
171 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
9a26b6b2 | 172 | CONTROL_BMI_RUN, |
c46782ef | 173 | #endif |
ed7f7860 | 174 | CONTROL_DEBUG, |
80a47a2c | 175 | #ifndef DISABLE_DKIM |
f7572e5a TK |
176 | CONTROL_DKIM_VERIFY, |
177 | #endif | |
13363eba | 178 | CONTROL_DSCP, |
c46782ef PH |
179 | CONTROL_ERROR, |
180 | CONTROL_CASEFUL_LOCAL_PART, | |
181 | CONTROL_CASELOWER_LOCAL_PART, | |
e4bdf652 | 182 | CONTROL_CUTTHROUGH_DELIVERY, |
c46782ef PH |
183 | CONTROL_ENFORCE_SYNC, |
184 | CONTROL_NO_ENFORCE_SYNC, | |
185 | CONTROL_FREEZE, | |
186 | CONTROL_QUEUE_ONLY, | |
187 | CONTROL_SUBMISSION, | |
188 | CONTROL_SUPPRESS_LOCAL_FIXUPS, | |
189 | #ifdef WITH_CONTENT_SCAN | |
9a26b6b2 | 190 | CONTROL_NO_MBOX_UNSPOOL, |
c46782ef PH |
191 | #endif |
192 | CONTROL_FAKEDEFER, | |
193 | CONTROL_FAKEREJECT, | |
cf8b11a5 | 194 | CONTROL_NO_MULTILINE, |
047bdd8c | 195 | CONTROL_NO_PIPELINING, |
4c590bd1 PH |
196 | CONTROL_NO_DELAY_FLUSH, |
197 | CONTROL_NO_CALLOUT_FLUSH | |
c46782ef | 198 | }; |
9a26b6b2 | 199 | |
8800895a PH |
200 | /* ACL control names; keep in step with the table above! This list is used for |
201 | turning ids into names. The actual list of recognized names is in the variable | |
202 | control_def controls_list[] below. The fact that there are two lists is a mess | |
203 | and should be tidied up. */ | |
9a26b6b2 PH |
204 | |
205 | static uschar *controls[] = { | |
c46782ef | 206 | US"allow_auth_unadvertised", |
9a26b6b2 PH |
207 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
208 | US"bmi_run", | |
209 | #endif | |
ed7f7860 | 210 | US"debug", |
80a47a2c TK |
211 | #ifndef DISABLE_DKIM |
212 | US"dkim_disable_verify", | |
f7572e5a | 213 | #endif |
13363eba | 214 | US"dscp", |
c46782ef PH |
215 | US"error", |
216 | US"caseful_local_part", | |
217 | US"caselower_local_part", | |
e4bdf652 | 218 | US"cutthrough_delivery", |
c46782ef PH |
219 | US"enforce_sync", |
220 | US"no_enforce_sync", | |
221 | US"freeze", | |
222 | US"queue_only", | |
223 | US"submission", | |
224 | US"suppress_local_fixups", | |
9a26b6b2 PH |
225 | #ifdef WITH_CONTENT_SCAN |
226 | US"no_mbox_unspool", | |
227 | #endif | |
cf8b11a5 PH |
228 | US"fakedefer", |
229 | US"fakereject", | |
aa6dc513 | 230 | US"no_multiline_responses", |
cf8b11a5 | 231 | US"no_pipelining", |
4c590bd1 PH |
232 | US"no_delay_flush", |
233 | US"no_callout_flush" | |
c46782ef | 234 | }; |
059ec3d9 | 235 | |
047bdd8c | 236 | /* Flags to indicate for which conditions/modifiers a string expansion is done |
059ec3d9 PH |
237 | at the outer level. In the other cases, expansion already occurs in the |
238 | checking functions. */ | |
239 | ||
240 | static uschar cond_expand_at_top[] = { | |
7421ecab | 241 | FALSE, /* acl */ |
3e536984 | 242 | TRUE, /* add_header */ |
059ec3d9 | 243 | FALSE, /* authenticated */ |
8523533c TK |
244 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
245 | TRUE, /* bmi_optin */ | |
8e669ac1 | 246 | #endif |
059ec3d9 | 247 | TRUE, /* condition */ |
c3611384 | 248 | TRUE, /* continue */ |
059ec3d9 | 249 | TRUE, /* control */ |
6a8f9482 TK |
250 | #ifdef EXPERIMENTAL_DCC |
251 | TRUE, /* dcc */ | |
252 | #endif | |
8523533c TK |
253 | #ifdef WITH_CONTENT_SCAN |
254 | TRUE, /* decode */ | |
255 | #endif | |
059ec3d9 | 256 | TRUE, /* delay */ |
8523533c TK |
257 | #ifdef WITH_OLD_DEMIME |
258 | TRUE, /* demime */ | |
fb2274d4 | 259 | #endif |
80a47a2c TK |
260 | #ifndef DISABLE_DKIM |
261 | TRUE, /* dkim_signers */ | |
262 | TRUE, /* dkim_status */ | |
8523533c | 263 | #endif |
059ec3d9 PH |
264 | TRUE, /* dnslists */ |
265 | FALSE, /* domains */ | |
266 | FALSE, /* encrypted */ | |
267 | TRUE, /* endpass */ | |
268 | FALSE, /* hosts */ | |
269 | FALSE, /* local_parts */ | |
270 | TRUE, /* log_message */ | |
6ea85e9a | 271 | TRUE, /* log_reject_target */ |
059ec3d9 | 272 | TRUE, /* logwrite */ |
8523533c TK |
273 | #ifdef WITH_CONTENT_SCAN |
274 | TRUE, /* malware */ | |
275 | #endif | |
059ec3d9 | 276 | TRUE, /* message */ |
8523533c TK |
277 | #ifdef WITH_CONTENT_SCAN |
278 | TRUE, /* mime_regex */ | |
279 | #endif | |
870f6ba8 | 280 | TRUE, /* ratelimit */ |
059ec3d9 | 281 | FALSE, /* recipients */ |
8523533c TK |
282 | #ifdef WITH_CONTENT_SCAN |
283 | TRUE, /* regex */ | |
284 | #endif | |
e7568d51 | 285 | TRUE, /* remove_header */ |
059ec3d9 PH |
286 | FALSE, /* sender_domains */ |
287 | FALSE, /* senders */ | |
288 | TRUE, /* set */ | |
8523533c TK |
289 | #ifdef WITH_CONTENT_SCAN |
290 | TRUE, /* spam */ | |
291 | #endif | |
292 | #ifdef EXPERIMENTAL_SPF | |
293 | TRUE, /* spf */ | |
65a7d8c3 | 294 | TRUE, /* spf_guess */ |
8523533c | 295 | #endif |
059ec3d9 PH |
296 | TRUE /* verify */ |
297 | }; | |
298 | ||
299 | /* Flags to identify the modifiers */ | |
300 | ||
301 | static uschar cond_modifiers[] = { | |
302 | FALSE, /* acl */ | |
3e536984 | 303 | TRUE, /* add_header */ |
059ec3d9 | 304 | FALSE, /* authenticated */ |
8523533c TK |
305 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
306 | TRUE, /* bmi_optin */ | |
8e669ac1 | 307 | #endif |
059ec3d9 | 308 | FALSE, /* condition */ |
c3611384 | 309 | TRUE, /* continue */ |
059ec3d9 | 310 | TRUE, /* control */ |
6a8f9482 TK |
311 | #ifdef EXPERIMENTAL_DCC |
312 | FALSE, /* dcc */ | |
313 | #endif | |
8523533c TK |
314 | #ifdef WITH_CONTENT_SCAN |
315 | FALSE, /* decode */ | |
316 | #endif | |
059ec3d9 | 317 | TRUE, /* delay */ |
8523533c TK |
318 | #ifdef WITH_OLD_DEMIME |
319 | FALSE, /* demime */ | |
fb2274d4 | 320 | #endif |
80a47a2c TK |
321 | #ifndef DISABLE_DKIM |
322 | FALSE, /* dkim_signers */ | |
323 | FALSE, /* dkim_status */ | |
8523533c | 324 | #endif |
059ec3d9 PH |
325 | FALSE, /* dnslists */ |
326 | FALSE, /* domains */ | |
327 | FALSE, /* encrypted */ | |
328 | TRUE, /* endpass */ | |
329 | FALSE, /* hosts */ | |
330 | FALSE, /* local_parts */ | |
331 | TRUE, /* log_message */ | |
6ea85e9a | 332 | TRUE, /* log_reject_target */ |
8523533c TK |
333 | TRUE, /* logwrite */ |
334 | #ifdef WITH_CONTENT_SCAN | |
335 | FALSE, /* malware */ | |
336 | #endif | |
059ec3d9 | 337 | TRUE, /* message */ |
8523533c TK |
338 | #ifdef WITH_CONTENT_SCAN |
339 | FALSE, /* mime_regex */ | |
340 | #endif | |
870f6ba8 | 341 | FALSE, /* ratelimit */ |
059ec3d9 | 342 | FALSE, /* recipients */ |
8523533c TK |
343 | #ifdef WITH_CONTENT_SCAN |
344 | FALSE, /* regex */ | |
345 | #endif | |
e7568d51 | 346 | TRUE, /* remove_header */ |
059ec3d9 PH |
347 | FALSE, /* sender_domains */ |
348 | FALSE, /* senders */ | |
349 | TRUE, /* set */ | |
8523533c TK |
350 | #ifdef WITH_CONTENT_SCAN |
351 | FALSE, /* spam */ | |
352 | #endif | |
353 | #ifdef EXPERIMENTAL_SPF | |
354 | FALSE, /* spf */ | |
65a7d8c3 | 355 | FALSE, /* spf_guess */ |
8523533c | 356 | #endif |
059ec3d9 PH |
357 | FALSE /* verify */ |
358 | }; | |
359 | ||
c3611384 | 360 | /* Bit map vector of which conditions and modifiers are not allowed at certain |
8f128379 PH |
361 | times. For each condition and modifier, there's a bitmap of dis-allowed times. |
362 | For some, it is easier to specify the negation of a small number of allowed | |
363 | times. */ | |
059ec3d9 PH |
364 | |
365 | static unsigned int cond_forbids[] = { | |
366 | 0, /* acl */ | |
8e669ac1 | 367 | |
71fafd95 | 368 | (unsigned int) |
45b91596 | 369 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* add_header */ |
71fafd95 | 370 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
45b91596 | 371 | (1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)| |
67caae1f | 372 | (1<<ACL_WHERE_DKIM)| |
45b91596 | 373 | (1<<ACL_WHERE_NOTSMTP_START)), |
71fafd95 | 374 | |
45b91596 PH |
375 | (1<<ACL_WHERE_NOTSMTP)| /* authenticated */ |
376 | (1<<ACL_WHERE_NOTSMTP_START)| | |
377 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO), | |
8e669ac1 | 378 | |
71fafd95 | 379 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
3864bb8e | 380 | (1<<ACL_WHERE_AUTH)| /* bmi_optin */ |
8523533c TK |
381 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
382 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_MIME)| | |
8e669ac1 | 383 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
8523533c TK |
384 | (1<<ACL_WHERE_MAILAUTH)| |
385 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 PH |
386 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_PREDATA)| |
387 | (1<<ACL_WHERE_NOTSMTP_START), | |
71fafd95 | 388 | #endif |
8e669ac1 | 389 | |
059ec3d9 | 390 | 0, /* condition */ |
8e669ac1 | 391 | |
c3611384 PH |
392 | 0, /* continue */ |
393 | ||
059ec3d9 | 394 | /* Certain types of control are always allowed, so we let it through |
2f079f46 | 395 | always and check in the control processing itself. */ |
8e669ac1 | 396 | |
059ec3d9 | 397 | 0, /* control */ |
8e669ac1 | 398 | |
6a8f9482 TK |
399 | #ifdef EXPERIMENTAL_DCC |
400 | (unsigned int) | |
401 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* dcc */ | |
402 | #endif | |
403 | ||
71fafd95 | 404 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
405 | (unsigned int) |
406 | ~(1<<ACL_WHERE_MIME), /* decode */ | |
71fafd95 | 407 | #endif |
8523533c | 408 | |
8f128379 | 409 | (1<<ACL_WHERE_NOTQUIT), /* delay */ |
8e669ac1 | 410 | |
71fafd95 | 411 | #ifdef WITH_OLD_DEMIME |
2f079f46 PH |
412 | (unsigned int) |
413 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* demime */ | |
71fafd95 | 414 | #endif |
8e669ac1 | 415 | |
80a47a2c TK |
416 | #ifndef DISABLE_DKIM |
417 | (unsigned int) | |
418 | ~(1<<ACL_WHERE_DKIM), /* dkim_signers */ | |
84330b7b | 419 | |
80a47a2c TK |
420 | (unsigned int) |
421 | ~(1<<ACL_WHERE_DKIM), /* dkim_status */ | |
71fafd95 | 422 | #endif |
fb2274d4 | 423 | |
45b91596 PH |
424 | (1<<ACL_WHERE_NOTSMTP)| /* dnslists */ |
425 | (1<<ACL_WHERE_NOTSMTP_START), | |
059ec3d9 | 426 | |
2f079f46 PH |
427 | (unsigned int) |
428 | ~(1<<ACL_WHERE_RCPT), /* domains */ | |
059ec3d9 | 429 | |
45b91596 PH |
430 | (1<<ACL_WHERE_NOTSMTP)| /* encrypted */ |
431 | (1<<ACL_WHERE_CONNECT)| | |
432 | (1<<ACL_WHERE_NOTSMTP_START)| | |
059ec3d9 | 433 | (1<<ACL_WHERE_HELO), |
8e669ac1 | 434 | |
059ec3d9 | 435 | 0, /* endpass */ |
8e669ac1 | 436 | |
45b91596 PH |
437 | (1<<ACL_WHERE_NOTSMTP)| /* hosts */ |
438 | (1<<ACL_WHERE_NOTSMTP_START), | |
059ec3d9 | 439 | |
2f079f46 PH |
440 | (unsigned int) |
441 | ~(1<<ACL_WHERE_RCPT), /* local_parts */ | |
059ec3d9 PH |
442 | |
443 | 0, /* log_message */ | |
8e669ac1 | 444 | |
6ea85e9a PH |
445 | 0, /* log_reject_target */ |
446 | ||
059ec3d9 | 447 | 0, /* logwrite */ |
8e669ac1 | 448 | |
71fafd95 | 449 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
450 | (unsigned int) |
451 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* malware */ | |
71fafd95 | 452 | #endif |
8523533c | 453 | |
059ec3d9 PH |
454 | 0, /* message */ |
455 | ||
71fafd95 | 456 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
457 | (unsigned int) |
458 | ~(1<<ACL_WHERE_MIME), /* mime_regex */ | |
71fafd95 | 459 | #endif |
8523533c | 460 | |
870f6ba8 TF |
461 | 0, /* ratelimit */ |
462 | ||
2f079f46 PH |
463 | (unsigned int) |
464 | ~(1<<ACL_WHERE_RCPT), /* recipients */ | |
059ec3d9 | 465 | |
71fafd95 | 466 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
467 | (unsigned int) |
468 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* regex */ | |
469 | (1<<ACL_WHERE_MIME)), | |
71fafd95 | 470 | #endif |
8523533c | 471 | |
e7568d51 TL |
472 | (unsigned int) |
473 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* remove_header */ | |
474 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
475 | (1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)| | |
476 | (1<<ACL_WHERE_NOTSMTP_START)), | |
477 | ||
059ec3d9 PH |
478 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* sender_domains */ |
479 | (1<<ACL_WHERE_HELO)| | |
480 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
481 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
482 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
483 | ||
484 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* senders */ | |
485 | (1<<ACL_WHERE_HELO)| | |
486 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
487 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
488 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
489 | ||
490 | 0, /* set */ | |
491 | ||
71fafd95 | 492 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
493 | (unsigned int) |
494 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* spam */ | |
71fafd95 | 495 | #endif |
8523533c | 496 | |
71fafd95 | 497 | #ifdef EXPERIMENTAL_SPF |
8523533c TK |
498 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf */ |
499 | (1<<ACL_WHERE_HELO)| | |
500 | (1<<ACL_WHERE_MAILAUTH)| | |
501 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
45b91596 PH |
502 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY)| |
503 | (1<<ACL_WHERE_NOTSMTP)| | |
504 | (1<<ACL_WHERE_NOTSMTP_START), | |
65a7d8c3 NM |
505 | |
506 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf_guess */ | |
507 | (1<<ACL_WHERE_HELO)| | |
508 | (1<<ACL_WHERE_MAILAUTH)| | |
509 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
510 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY)| | |
511 | (1<<ACL_WHERE_NOTSMTP)| | |
512 | (1<<ACL_WHERE_NOTSMTP_START), | |
71fafd95 | 513 | #endif |
8523533c | 514 | |
059ec3d9 PH |
515 | /* Certain types of verify are always allowed, so we let it through |
516 | always and check in the verify function itself */ | |
517 | ||
518 | 0 /* verify */ | |
059ec3d9 PH |
519 | }; |
520 | ||
521 | ||
c5fcb476 PH |
522 | /* Bit map vector of which controls are not allowed at certain times. For |
523 | each control, there's a bitmap of dis-allowed times. For some, it is easier to | |
524 | specify the negation of a small number of allowed times. */ | |
525 | ||
526 | static unsigned int control_forbids[] = { | |
c46782ef PH |
527 | (unsigned int) |
528 | ~((1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)), /* allow_auth_unadvertised */ | |
529 | ||
530 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
8523533c | 531 | 0, /* bmi_run */ |
c46782ef PH |
532 | #endif |
533 | ||
ed7f7860 PP |
534 | 0, /* debug */ |
535 | ||
80a47a2c TK |
536 | #ifndef DISABLE_DKIM |
537 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dkim_disable_verify */ | |
f7572e5a TK |
538 | (1<<ACL_WHERE_NOTSMTP_START), |
539 | #endif | |
540 | ||
13363eba PP |
541 | (1<<ACL_WHERE_NOTSMTP)| |
542 | (1<<ACL_WHERE_NOTSMTP_START)| | |
543 | (1<<ACL_WHERE_NOTQUIT), /* dscp */ | |
544 | ||
c5fcb476 | 545 | 0, /* error */ |
8e669ac1 PH |
546 | |
547 | (unsigned int) | |
c5fcb476 | 548 | ~(1<<ACL_WHERE_RCPT), /* caseful_local_part */ |
8e669ac1 PH |
549 | |
550 | (unsigned int) | |
c5fcb476 | 551 | ~(1<<ACL_WHERE_RCPT), /* caselower_local_part */ |
8e669ac1 | 552 | |
e4bdf652 JH |
553 | (unsigned int) |
554 | 0, /* cutthrough_delivery */ | |
555 | ||
45b91596 PH |
556 | (1<<ACL_WHERE_NOTSMTP)| /* enforce_sync */ |
557 | (1<<ACL_WHERE_NOTSMTP_START), | |
8e669ac1 | 558 | |
45b91596 PH |
559 | (1<<ACL_WHERE_NOTSMTP)| /* no_enforce_sync */ |
560 | (1<<ACL_WHERE_NOTSMTP_START), | |
8e669ac1 PH |
561 | |
562 | (unsigned int) | |
c5fcb476 PH |
563 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* freeze */ |
564 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
e715ad22 | 565 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
566 | |
567 | (unsigned int) | |
c5fcb476 PH |
568 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* queue_only */ |
569 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
e715ad22 | 570 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
571 | |
572 | (unsigned int) | |
c5fcb476 | 573 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* submission */ |
8e669ac1 | 574 | (1<<ACL_WHERE_PREDATA)), |
8523533c | 575 | |
8800895a PH |
576 | (unsigned int) |
577 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* suppress_local_fixups */ | |
45b91596 PH |
578 | (1<<ACL_WHERE_PREDATA)| |
579 | (1<<ACL_WHERE_NOTSMTP_START)), | |
8800895a | 580 | |
c46782ef | 581 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 582 | (unsigned int) |
14d57970 | 583 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* no_mbox_unspool */ |
e715ad22 TK |
584 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
585 | (1<<ACL_WHERE_MIME)), | |
c46782ef | 586 | #endif |
a6c4ab60 | 587 | |
29aba418 TF |
588 | (unsigned int) |
589 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakedefer */ | |
590 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
591 | (1<<ACL_WHERE_MIME)), | |
592 | ||
8e669ac1 | 593 | (unsigned int) |
a6c4ab60 | 594 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakereject */ |
e715ad22 TK |
595 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
596 | (1<<ACL_WHERE_MIME)), | |
8523533c | 597 | |
45b91596 | 598 | (1<<ACL_WHERE_NOTSMTP)| /* no_multiline */ |
cf8b11a5 PH |
599 | (1<<ACL_WHERE_NOTSMTP_START), |
600 | ||
601 | (1<<ACL_WHERE_NOTSMTP)| /* no_pipelining */ | |
047bdd8c PH |
602 | (1<<ACL_WHERE_NOTSMTP_START), |
603 | ||
604 | (1<<ACL_WHERE_NOTSMTP)| /* no_delay_flush */ | |
4c590bd1 PH |
605 | (1<<ACL_WHERE_NOTSMTP_START), |
606 | ||
607 | (1<<ACL_WHERE_NOTSMTP)| /* no_callout_flush */ | |
45b91596 | 608 | (1<<ACL_WHERE_NOTSMTP_START) |
c5fcb476 PH |
609 | }; |
610 | ||
611 | /* Structure listing various control arguments, with their characteristics. */ | |
059ec3d9 PH |
612 | |
613 | typedef struct control_def { | |
614 | uschar *name; | |
615 | int value; /* CONTROL_xxx value */ | |
059ec3d9 PH |
616 | BOOL has_option; /* Has /option(s) following */ |
617 | } control_def; | |
618 | ||
619 | static control_def controls_list[] = { | |
c46782ef | 620 | { US"allow_auth_unadvertised", CONTROL_AUTH_UNADVERTISED, FALSE }, |
8523533c | 621 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
c46782ef | 622 | { US"bmi_run", CONTROL_BMI_RUN, FALSE }, |
fb2274d4 | 623 | #endif |
ed7f7860 | 624 | { US"debug", CONTROL_DEBUG, TRUE }, |
80a47a2c TK |
625 | #ifndef DISABLE_DKIM |
626 | { US"dkim_disable_verify", CONTROL_DKIM_VERIFY, FALSE }, | |
8523533c | 627 | #endif |
13363eba | 628 | { US"dscp", CONTROL_DSCP, TRUE }, |
c46782ef PH |
629 | { US"caseful_local_part", CONTROL_CASEFUL_LOCAL_PART, FALSE }, |
630 | { US"caselower_local_part", CONTROL_CASELOWER_LOCAL_PART, FALSE }, | |
631 | { US"enforce_sync", CONTROL_ENFORCE_SYNC, FALSE }, | |
632 | { US"freeze", CONTROL_FREEZE, TRUE }, | |
4c590bd1 | 633 | { US"no_callout_flush", CONTROL_NO_CALLOUT_FLUSH, FALSE }, |
047bdd8c | 634 | { US"no_delay_flush", CONTROL_NO_DELAY_FLUSH, FALSE }, |
c46782ef PH |
635 | { US"no_enforce_sync", CONTROL_NO_ENFORCE_SYNC, FALSE }, |
636 | { US"no_multiline_responses", CONTROL_NO_MULTILINE, FALSE }, | |
cf8b11a5 | 637 | { US"no_pipelining", CONTROL_NO_PIPELINING, FALSE }, |
c46782ef | 638 | { US"queue_only", CONTROL_QUEUE_ONLY, FALSE }, |
8523533c | 639 | #ifdef WITH_CONTENT_SCAN |
c46782ef | 640 | { US"no_mbox_unspool", CONTROL_NO_MBOX_UNSPOOL, FALSE }, |
8523533c | 641 | #endif |
c46782ef PH |
642 | { US"fakedefer", CONTROL_FAKEDEFER, TRUE }, |
643 | { US"fakereject", CONTROL_FAKEREJECT, TRUE }, | |
644 | { US"submission", CONTROL_SUBMISSION, TRUE }, | |
e4bdf652 JH |
645 | { US"suppress_local_fixups", CONTROL_SUPPRESS_LOCAL_FIXUPS, FALSE }, |
646 | { US"cutthrough_delivery", CONTROL_CUTTHROUGH_DELIVERY, FALSE } | |
059ec3d9 PH |
647 | }; |
648 | ||
e5a9dba6 PH |
649 | /* Support data structures for Client SMTP Authorization. acl_verify_csa() |
650 | caches its result in a tree to avoid repeated DNS queries. The result is an | |
651 | integer code which is used as an index into the following tables of | |
652 | explanatory strings and verification return codes. */ | |
653 | ||
654 | static tree_node *csa_cache = NULL; | |
655 | ||
656 | enum { CSA_UNKNOWN, CSA_OK, CSA_DEFER_SRV, CSA_DEFER_ADDR, | |
657 | CSA_FAIL_EXPLICIT, CSA_FAIL_DOMAIN, CSA_FAIL_NOADDR, CSA_FAIL_MISMATCH }; | |
658 | ||
659 | /* The acl_verify_csa() return code is translated into an acl_verify() return | |
660 | code using the following table. It is OK unless the client is definitely not | |
661 | authorized. This is because CSA is supposed to be optional for sending sites, | |
662 | so recipients should not be too strict about checking it - especially because | |
663 | DNS problems are quite likely to occur. It's possible to use $csa_status in | |
664 | further ACL conditions to distinguish ok, unknown, and defer if required, but | |
665 | the aim is to make the usual configuration simple. */ | |
666 | ||
667 | static int csa_return_code[] = { | |
668 | OK, OK, OK, OK, | |
669 | FAIL, FAIL, FAIL, FAIL | |
670 | }; | |
671 | ||
672 | static uschar *csa_status_string[] = { | |
673 | US"unknown", US"ok", US"defer", US"defer", | |
674 | US"fail", US"fail", US"fail", US"fail" | |
675 | }; | |
676 | ||
677 | static uschar *csa_reason_string[] = { | |
678 | US"unknown", | |
679 | US"ok", | |
680 | US"deferred (SRV lookup failed)", | |
681 | US"deferred (target address lookup failed)", | |
682 | US"failed (explicit authorization required)", | |
683 | US"failed (host name not authorized)", | |
684 | US"failed (no authorized addresses)", | |
685 | US"failed (client address mismatch)" | |
686 | }; | |
687 | ||
c99ce5c9 TF |
688 | /* Options for the ratelimit condition. Note that there are two variants of |
689 | the per_rcpt option, depending on the ACL that is used to measure the rate. | |
690 | However any ACL must be able to look up per_rcpt rates in /noupdate mode, | |
691 | so the two variants must have the same internal representation as well as | |
692 | the same configuration string. */ | |
693 | ||
694 | enum { | |
695 | RATE_PER_WHAT, RATE_PER_CLASH, RATE_PER_ADDR, RATE_PER_BYTE, RATE_PER_CMD, | |
696 | RATE_PER_CONN, RATE_PER_MAIL, RATE_PER_RCPT, RATE_PER_ALLRCPTS | |
697 | }; | |
698 | ||
699 | #define RATE_SET(var,new) \ | |
700 | (((var) == RATE_PER_WHAT) ? ((var) = RATE_##new) : ((var) = RATE_PER_CLASH)) | |
701 | ||
702 | static uschar *ratelimit_option_string[] = { | |
703 | US"?", US"!", US"per_addr", US"per_byte", US"per_cmd", | |
704 | US"per_conn", US"per_mail", US"per_rcpt", US"per_rcpt" | |
705 | }; | |
706 | ||
059ec3d9 PH |
707 | /* Enable recursion between acl_check_internal() and acl_check_condition() */ |
708 | ||
f60d98e8 JH |
709 | static int acl_check_wargs(int, address_item *, uschar *, int, uschar **, |
710 | uschar **); | |
059ec3d9 PH |
711 | |
712 | ||
713 | /************************************************* | |
714 | * Pick out name from list * | |
715 | *************************************************/ | |
716 | ||
717 | /* Use a binary chop method | |
718 | ||
719 | Arguments: | |
720 | name name to find | |
721 | list list of names | |
722 | end size of list | |
723 | ||
724 | Returns: offset in list, or -1 if not found | |
725 | */ | |
726 | ||
727 | static int | |
728 | acl_checkname(uschar *name, uschar **list, int end) | |
729 | { | |
730 | int start = 0; | |
731 | ||
732 | while (start < end) | |
733 | { | |
734 | int mid = (start + end)/2; | |
735 | int c = Ustrcmp(name, list[mid]); | |
736 | if (c == 0) return mid; | |
737 | if (c < 0) end = mid; else start = mid + 1; | |
738 | } | |
739 | ||
740 | return -1; | |
741 | } | |
742 | ||
743 | ||
744 | /************************************************* | |
745 | * Read and parse one ACL * | |
746 | *************************************************/ | |
747 | ||
748 | /* This function is called both from readconf in order to parse the ACLs in the | |
749 | configuration file, and also when an ACL is encountered dynamically (e.g. as | |
750 | the result of an expansion). It is given a function to call in order to | |
751 | retrieve the lines of the ACL. This function handles skipping comments and | |
752 | blank lines (where relevant). | |
753 | ||
754 | Arguments: | |
755 | func function to get next line of ACL | |
756 | error where to put an error message | |
757 | ||
758 | Returns: pointer to ACL, or NULL | |
759 | NULL can be legal (empty ACL); in this case error will be NULL | |
760 | */ | |
761 | ||
762 | acl_block * | |
763 | acl_read(uschar *(*func)(void), uschar **error) | |
764 | { | |
765 | acl_block *yield = NULL; | |
766 | acl_block **lastp = &yield; | |
767 | acl_block *this = NULL; | |
768 | acl_condition_block *cond; | |
769 | acl_condition_block **condp = NULL; | |
770 | uschar *s; | |
771 | ||
772 | *error = NULL; | |
773 | ||
774 | while ((s = (*func)()) != NULL) | |
775 | { | |
776 | int v, c; | |
777 | BOOL negated = FALSE; | |
778 | uschar *saveline = s; | |
779 | uschar name[64]; | |
780 | ||
781 | /* Conditions (but not verbs) are allowed to be negated by an initial | |
782 | exclamation mark. */ | |
783 | ||
784 | while (isspace(*s)) s++; | |
785 | if (*s == '!') | |
786 | { | |
787 | negated = TRUE; | |
788 | s++; | |
789 | } | |
790 | ||
cf00dad6 PH |
791 | /* Read the name of a verb or a condition, or the start of a new ACL, which |
792 | can be started by a name, or by a macro definition. */ | |
059ec3d9 PH |
793 | |
794 | s = readconf_readname(name, sizeof(name), s); | |
b8dc3e4a | 795 | if (*s == ':' || (isupper(name[0]) && *s == '=')) return yield; |
059ec3d9 PH |
796 | |
797 | /* If a verb is unrecognized, it may be another condition or modifier that | |
798 | continues the previous verb. */ | |
799 | ||
800 | v = acl_checkname(name, verbs, sizeof(verbs)/sizeof(char *)); | |
801 | if (v < 0) | |
802 | { | |
803 | if (this == NULL) | |
804 | { | |
4e167a8c PH |
805 | *error = string_sprintf("unknown ACL verb \"%s\" in \"%s\"", name, |
806 | saveline); | |
059ec3d9 PH |
807 | return NULL; |
808 | } | |
809 | } | |
810 | ||
811 | /* New verb */ | |
812 | ||
813 | else | |
814 | { | |
815 | if (negated) | |
816 | { | |
817 | *error = string_sprintf("malformed ACL line \"%s\"", saveline); | |
818 | return NULL; | |
819 | } | |
820 | this = store_get(sizeof(acl_block)); | |
821 | *lastp = this; | |
822 | lastp = &(this->next); | |
823 | this->next = NULL; | |
824 | this->verb = v; | |
825 | this->condition = NULL; | |
826 | condp = &(this->condition); | |
827 | if (*s == 0) continue; /* No condition on this line */ | |
828 | if (*s == '!') | |
829 | { | |
830 | negated = TRUE; | |
831 | s++; | |
832 | } | |
833 | s = readconf_readname(name, sizeof(name), s); /* Condition name */ | |
834 | } | |
835 | ||
836 | /* Handle a condition or modifier. */ | |
837 | ||
838 | c = acl_checkname(name, conditions, sizeof(conditions)/sizeof(char *)); | |
839 | if (c < 0) | |
840 | { | |
841 | *error = string_sprintf("unknown ACL condition/modifier in \"%s\"", | |
842 | saveline); | |
843 | return NULL; | |
844 | } | |
845 | ||
846 | /* The modifiers may not be negated */ | |
847 | ||
848 | if (negated && cond_modifiers[c]) | |
849 | { | |
850 | *error = string_sprintf("ACL error: negation is not allowed with " | |
851 | "\"%s\"", conditions[c]); | |
852 | return NULL; | |
853 | } | |
854 | ||
855 | /* ENDPASS may occur only with ACCEPT or DISCARD. */ | |
856 | ||
857 | if (c == ACLC_ENDPASS && | |
858 | this->verb != ACL_ACCEPT && | |
859 | this->verb != ACL_DISCARD) | |
860 | { | |
861 | *error = string_sprintf("ACL error: \"%s\" is not allowed with \"%s\"", | |
862 | conditions[c], verbs[this->verb]); | |
863 | return NULL; | |
864 | } | |
865 | ||
866 | cond = store_get(sizeof(acl_condition_block)); | |
867 | cond->next = NULL; | |
868 | cond->type = c; | |
869 | cond->u.negated = negated; | |
870 | ||
871 | *condp = cond; | |
872 | condp = &(cond->next); | |
873 | ||
874 | /* The "set" modifier is different in that its argument is "name=value" | |
875 | rather than just a value, and we can check the validity of the name, which | |
38a0a95f PH |
876 | gives us a variable name to insert into the data block. The original ACL |
877 | variable names were acl_c0 ... acl_c9 and acl_m0 ... acl_m9. This was | |
878 | extended to 20 of each type, but after that people successfully argued for | |
641cb756 PH |
879 | arbitrary names. In the new scheme, the names must start with acl_c or acl_m. |
880 | After that, we allow alphanumerics and underscores, but the first character | |
881 | after c or m must be a digit or an underscore. This retains backwards | |
882 | compatibility. */ | |
059ec3d9 PH |
883 | |
884 | if (c == ACLC_SET) | |
885 | { | |
47ca6d6c PH |
886 | uschar *endptr; |
887 | ||
38a0a95f PH |
888 | if (Ustrncmp(s, "acl_c", 5) != 0 && |
889 | Ustrncmp(s, "acl_m", 5) != 0) | |
47ca6d6c | 890 | { |
38a0a95f PH |
891 | *error = string_sprintf("invalid variable name after \"set\" in ACL " |
892 | "modifier \"set %s\" (must start \"acl_c\" or \"acl_m\")", s); | |
893 | return NULL; | |
47ca6d6c | 894 | } |
38a0a95f PH |
895 | |
896 | endptr = s + 5; | |
641cb756 PH |
897 | if (!isdigit(*endptr) && *endptr != '_') |
898 | { | |
899 | *error = string_sprintf("invalid variable name after \"set\" in ACL " | |
900 | "modifier \"set %s\" (digit or underscore must follow acl_c or acl_m)", | |
901 | s); | |
902 | return NULL; | |
903 | } | |
904 | ||
38a0a95f | 905 | while (*endptr != 0 && *endptr != '=' && !isspace(*endptr)) |
47ca6d6c | 906 | { |
38a0a95f PH |
907 | if (!isalnum(*endptr) && *endptr != '_') |
908 | { | |
909 | *error = string_sprintf("invalid character \"%c\" in variable name " | |
910 | "in ACL modifier \"set %s\"", *endptr, s); | |
911 | return NULL; | |
912 | } | |
913 | endptr++; | |
47ca6d6c | 914 | } |
47ca6d6c | 915 | |
38a0a95f | 916 | cond->u.varname = string_copyn(s + 4, endptr - s - 4); |
47ca6d6c | 917 | s = endptr; |
059ec3d9 PH |
918 | while (isspace(*s)) s++; |
919 | } | |
920 | ||
921 | /* For "set", we are now positioned for the data. For the others, only | |
922 | "endpass" has no data */ | |
923 | ||
924 | if (c != ACLC_ENDPASS) | |
925 | { | |
926 | if (*s++ != '=') | |
927 | { | |
928 | *error = string_sprintf("\"=\" missing after ACL \"%s\" %s", name, | |
929 | cond_modifiers[c]? US"modifier" : US"condition"); | |
930 | return NULL; | |
931 | } | |
932 | while (isspace(*s)) s++; | |
933 | cond->arg = string_copy(s); | |
934 | } | |
935 | } | |
936 | ||
937 | return yield; | |
938 | } | |
939 | ||
940 | ||
941 | ||
71fafd95 PH |
942 | /************************************************* |
943 | * Set up added header line(s) * | |
944 | *************************************************/ | |
945 | ||
946 | /* This function is called by the add_header modifier, and also from acl_warn() | |
947 | to implement the now-deprecated way of adding header lines using "message" on a | |
948 | "warn" verb. The argument is treated as a sequence of header lines which are | |
949 | added to a chain, provided there isn't an identical one already there. | |
950 | ||
951 | Argument: string of header lines | |
952 | Returns: nothing | |
953 | */ | |
954 | ||
955 | static void | |
956 | setup_header(uschar *hstring) | |
957 | { | |
958 | uschar *p, *q; | |
959 | int hlen = Ustrlen(hstring); | |
960 | ||
b1b05573 JH |
961 | /* Ignore any leading newlines */ |
962 | while (*hstring == '\n') hstring++, hlen--; | |
71fafd95 | 963 | |
b1b05573 | 964 | /* An empty string does nothing; ensure exactly one final newline. */ |
71fafd95 | 965 | if (hlen <= 0) return; |
b1b05573 JH |
966 | if (hstring[--hlen] != '\n') hstring = string_sprintf("%s\n", hstring); |
967 | else while(hstring[--hlen] == '\n') hstring[hlen+1] = '\0'; | |
71fafd95 PH |
968 | |
969 | /* Loop for multiple header lines, taking care about continuations */ | |
970 | ||
971 | for (p = q = hstring; *p != 0; ) | |
972 | { | |
973 | uschar *s; | |
974 | int newtype = htype_add_bot; | |
975 | header_line **hptr = &acl_added_headers; | |
976 | ||
977 | /* Find next header line within the string */ | |
978 | ||
979 | for (;;) | |
980 | { | |
981 | q = Ustrchr(q, '\n'); | |
982 | if (*(++q) != ' ' && *q != '\t') break; | |
983 | } | |
984 | ||
985 | /* If the line starts with a colon, interpret the instruction for where to | |
986 | add it. This temporarily sets up a new type. */ | |
987 | ||
988 | if (*p == ':') | |
989 | { | |
990 | if (strncmpic(p, US":after_received:", 16) == 0) | |
991 | { | |
992 | newtype = htype_add_rec; | |
993 | p += 16; | |
994 | } | |
995 | else if (strncmpic(p, US":at_start_rfc:", 14) == 0) | |
996 | { | |
997 | newtype = htype_add_rfc; | |
998 | p += 14; | |
999 | } | |
1000 | else if (strncmpic(p, US":at_start:", 10) == 0) | |
1001 | { | |
1002 | newtype = htype_add_top; | |
1003 | p += 10; | |
1004 | } | |
1005 | else if (strncmpic(p, US":at_end:", 8) == 0) | |
1006 | { | |
1007 | newtype = htype_add_bot; | |
1008 | p += 8; | |
1009 | } | |
1010 | while (*p == ' ' || *p == '\t') p++; | |
1011 | } | |
1012 | ||
1013 | /* See if this line starts with a header name, and if not, add X-ACL-Warn: | |
1014 | to the front of it. */ | |
1015 | ||
1016 | for (s = p; s < q - 1; s++) | |
1017 | { | |
1018 | if (*s == ':' || !isgraph(*s)) break; | |
1019 | } | |
1020 | ||
438257ba | 1021 | s = string_sprintf("%s%.*s", (*s == ':')? "" : "X-ACL-Warn: ", (int) (q - p), p); |
71fafd95 PH |
1022 | hlen = Ustrlen(s); |
1023 | ||
1024 | /* See if this line has already been added */ | |
1025 | ||
1026 | while (*hptr != NULL) | |
1027 | { | |
1028 | if (Ustrncmp((*hptr)->text, s, hlen) == 0) break; | |
1029 | hptr = &((*hptr)->next); | |
1030 | } | |
1031 | ||
1032 | /* Add if not previously present */ | |
1033 | ||
1034 | if (*hptr == NULL) | |
1035 | { | |
1036 | header_line *h = store_get(sizeof(header_line)); | |
1037 | h->text = s; | |
1038 | h->next = NULL; | |
1039 | h->type = newtype; | |
1040 | h->slen = hlen; | |
1041 | *hptr = h; | |
1042 | hptr = &(h->next); | |
1043 | } | |
1044 | ||
1045 | /* Advance for next header line within the string */ | |
1046 | ||
1047 | p = q; | |
1048 | } | |
1049 | } | |
1050 | ||
1051 | ||
1052 | ||
e7568d51 TL |
1053 | /************************************************* |
1054 | * Set up removed header line(s) * | |
1055 | *************************************************/ | |
1056 | ||
1057 | /* This function is called by the remove_header modifier. The argument is | |
1058 | treated as a sequence of header names which are added to a colon separated | |
1059 | list, provided there isn't an identical one already there. | |
1060 | ||
1061 | Argument: string of header names | |
1062 | Returns: nothing | |
1063 | */ | |
1064 | ||
1065 | static void | |
1066 | setup_remove_header(uschar *hnames) | |
1067 | { | |
1068 | if (*hnames != 0) | |
1069 | { | |
1070 | if (acl_removed_headers == NULL) | |
1071 | acl_removed_headers = hnames; | |
1072 | else | |
1073 | acl_removed_headers = string_sprintf("%s : %s", acl_removed_headers, hnames); | |
1074 | } | |
1075 | } | |
1076 | ||
1077 | ||
71fafd95 | 1078 | |
059ec3d9 PH |
1079 | /************************************************* |
1080 | * Handle warnings * | |
1081 | *************************************************/ | |
1082 | ||
1083 | /* This function is called when a WARN verb's conditions are true. It adds to | |
1084 | the message's headers, and/or writes information to the log. In each case, this | |
1085 | only happens once (per message for headers, per connection for log). | |
1086 | ||
71fafd95 PH |
1087 | ** NOTE: The header adding action using the "message" setting is historic, and |
1088 | its use is now deprecated. The new add_header modifier should be used instead. | |
1089 | ||
059ec3d9 PH |
1090 | Arguments: |
1091 | where ACL_WHERE_xxxx indicating which ACL this is | |
1092 | user_message message for adding to headers | |
1093 | log_message message for logging, if different | |
1094 | ||
1095 | Returns: nothing | |
1096 | */ | |
1097 | ||
1098 | static void | |
1099 | acl_warn(int where, uschar *user_message, uschar *log_message) | |
1100 | { | |
059ec3d9 PH |
1101 | if (log_message != NULL && log_message != user_message) |
1102 | { | |
1103 | uschar *text; | |
1104 | string_item *logged; | |
1105 | ||
1106 | text = string_sprintf("%s Warning: %s", host_and_ident(TRUE), | |
1107 | string_printing(log_message)); | |
1108 | ||
1109 | /* If a sender verification has failed, and the log message is "sender verify | |
1110 | failed", add the failure message. */ | |
1111 | ||
1112 | if (sender_verified_failed != NULL && | |
1113 | sender_verified_failed->message != NULL && | |
1114 | strcmpic(log_message, US"sender verify failed") == 0) | |
1115 | text = string_sprintf("%s: %s", text, sender_verified_failed->message); | |
1116 | ||
9c7a242c PH |
1117 | /* Search previously logged warnings. They are kept in malloc |
1118 | store so they can be freed at the start of a new message. */ | |
059ec3d9 PH |
1119 | |
1120 | for (logged = acl_warn_logged; logged != NULL; logged = logged->next) | |
1121 | if (Ustrcmp(logged->text, text) == 0) break; | |
1122 | ||
1123 | if (logged == NULL) | |
1124 | { | |
1125 | int length = Ustrlen(text) + 1; | |
1126 | log_write(0, LOG_MAIN, "%s", text); | |
1127 | logged = store_malloc(sizeof(string_item) + length); | |
1128 | logged->text = (uschar *)logged + sizeof(string_item); | |
1129 | memcpy(logged->text, text, length); | |
1130 | logged->next = acl_warn_logged; | |
1131 | acl_warn_logged = logged; | |
1132 | } | |
1133 | } | |
1134 | ||
1135 | /* If there's no user message, we are done. */ | |
1136 | ||
1137 | if (user_message == NULL) return; | |
1138 | ||
1139 | /* If this isn't a message ACL, we can't do anything with a user message. | |
1140 | Log an error. */ | |
1141 | ||
1142 | if (where > ACL_WHERE_NOTSMTP) | |
1143 | { | |
1144 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting " | |
1145 | "found in a non-message (%s) ACL: cannot specify header lines here: " | |
1146 | "message ignored", acl_wherenames[where]); | |
1147 | return; | |
1148 | } | |
1149 | ||
71fafd95 PH |
1150 | /* The code for setting up header lines is now abstracted into a separate |
1151 | function so that it can be used for the add_header modifier as well. */ | |
059ec3d9 | 1152 | |
71fafd95 | 1153 | setup_header(user_message); |
059ec3d9 PH |
1154 | } |
1155 | ||
1156 | ||
1157 | ||
1158 | /************************************************* | |
1159 | * Verify and check reverse DNS * | |
1160 | *************************************************/ | |
1161 | ||
1162 | /* Called from acl_verify() below. We look up the host name(s) of the client IP | |
1163 | address if this has not yet been done. The host_name_lookup() function checks | |
1164 | that one of these names resolves to an address list that contains the client IP | |
1165 | address, so we don't actually have to do the check here. | |
1166 | ||
1167 | Arguments: | |
1168 | user_msgptr pointer for user message | |
1169 | log_msgptr pointer for log message | |
1170 | ||
1171 | Returns: OK verification condition succeeded | |
1172 | FAIL verification failed | |
1173 | DEFER there was a problem verifying | |
1174 | */ | |
1175 | ||
1176 | static int | |
1177 | acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr) | |
1178 | { | |
1179 | int rc; | |
1180 | ||
1181 | user_msgptr = user_msgptr; /* stop compiler warning */ | |
1182 | ||
1183 | /* Previous success */ | |
1184 | ||
1185 | if (sender_host_name != NULL) return OK; | |
1186 | ||
1187 | /* Previous failure */ | |
1188 | ||
1189 | if (host_lookup_failed) | |
1190 | { | |
1191 | *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg); | |
1192 | return FAIL; | |
1193 | } | |
1194 | ||
1195 | /* Need to do a lookup */ | |
1196 | ||
1197 | HDEBUG(D_acl) | |
1198 | debug_printf("looking up host name to force name/address consistency check\n"); | |
1199 | ||
1200 | if ((rc = host_name_lookup()) != OK) | |
1201 | { | |
1202 | *log_msgptr = (rc == DEFER)? | |
1203 | US"host lookup deferred for reverse lookup check" | |
1204 | : | |
1205 | string_sprintf("host lookup failed for reverse lookup check%s", | |
1206 | host_lookup_msg); | |
1207 | return rc; /* DEFER or FAIL */ | |
1208 | } | |
1209 | ||
1210 | host_build_sender_fullhost(); | |
1211 | return OK; | |
1212 | } | |
1213 | ||
1214 | ||
1215 | ||
e5a9dba6 PH |
1216 | /************************************************* |
1217 | * Check client IP address matches CSA target * | |
1218 | *************************************************/ | |
1219 | ||
1220 | /* Called from acl_verify_csa() below. This routine scans a section of a DNS | |
1221 | response for address records belonging to the CSA target hostname. The section | |
1222 | is specified by the reset argument, either RESET_ADDITIONAL or RESET_ANSWERS. | |
1223 | If one of the addresses matches the client's IP address, then the client is | |
1224 | authorized by CSA. If there are target IP addresses but none of them match | |
1225 | then the client is using an unauthorized IP address. If there are no target IP | |
1226 | addresses then the client cannot be using an authorized IP address. (This is | |
1227 | an odd configuration - why didn't the SRV record have a weight of 1 instead?) | |
1228 | ||
1229 | Arguments: | |
1230 | dnsa the DNS answer block | |
1231 | dnss a DNS scan block for us to use | |
1232 | reset option specifing what portion to scan, as described above | |
1233 | target the target hostname to use for matching RR names | |
1234 | ||
1235 | Returns: CSA_OK successfully authorized | |
1236 | CSA_FAIL_MISMATCH addresses found but none matched | |
1237 | CSA_FAIL_NOADDR no target addresses found | |
1238 | */ | |
1239 | ||
1240 | static int | |
1241 | acl_verify_csa_address(dns_answer *dnsa, dns_scan *dnss, int reset, | |
1242 | uschar *target) | |
1243 | { | |
1244 | dns_record *rr; | |
1245 | dns_address *da; | |
1246 | ||
1247 | BOOL target_found = FALSE; | |
1248 | ||
1249 | for (rr = dns_next_rr(dnsa, dnss, reset); | |
1250 | rr != NULL; | |
1251 | rr = dns_next_rr(dnsa, dnss, RESET_NEXT)) | |
1252 | { | |
1253 | /* Check this is an address RR for the target hostname. */ | |
1254 | ||
1255 | if (rr->type != T_A | |
1256 | #if HAVE_IPV6 | |
1257 | && rr->type != T_AAAA | |
1258 | #ifdef SUPPORT_A6 | |
1259 | && rr->type != T_A6 | |
1260 | #endif | |
1261 | #endif | |
1262 | ) continue; | |
1263 | ||
1264 | if (strcmpic(target, rr->name) != 0) continue; | |
1265 | ||
1266 | target_found = TRUE; | |
1267 | ||
1268 | /* Turn the target address RR into a list of textual IP addresses and scan | |
1269 | the list. There may be more than one if it is an A6 RR. */ | |
1270 | ||
1271 | for (da = dns_address_from_rr(dnsa, rr); da != NULL; da = da->next) | |
1272 | { | |
1273 | /* If the client IP address matches the target IP address, it's good! */ | |
1274 | ||
1275 | DEBUG(D_acl) debug_printf("CSA target address is %s\n", da->address); | |
1276 | ||
1277 | if (strcmpic(sender_host_address, da->address) == 0) return CSA_OK; | |
1278 | } | |
1279 | } | |
1280 | ||
1281 | /* If we found some target addresses but none of them matched, the client is | |
1282 | using an unauthorized IP address, otherwise the target has no authorized IP | |
1283 | addresses. */ | |
1284 | ||
1285 | if (target_found) return CSA_FAIL_MISMATCH; | |
1286 | else return CSA_FAIL_NOADDR; | |
1287 | } | |
1288 | ||
1289 | ||
1290 | ||
1291 | /************************************************* | |
1292 | * Verify Client SMTP Authorization * | |
1293 | *************************************************/ | |
1294 | ||
1295 | /* Called from acl_verify() below. This routine calls dns_lookup_special() | |
1296 | to find the CSA SRV record corresponding to the domain argument, or | |
1297 | $sender_helo_name if no argument is provided. It then checks that the | |
1298 | client is authorized, and that its IP address corresponds to the SRV | |
1299 | target's address by calling acl_verify_csa_address() above. The address | |
1300 | should have been returned in the DNS response's ADDITIONAL section, but if | |
1301 | not we perform another DNS lookup to get it. | |
1302 | ||
1303 | Arguments: | |
1304 | domain pointer to optional parameter following verify = csa | |
1305 | ||
1306 | Returns: CSA_UNKNOWN no valid CSA record found | |
1307 | CSA_OK successfully authorized | |
1308 | CSA_FAIL_* client is definitely not authorized | |
1309 | CSA_DEFER_* there was a DNS problem | |
1310 | */ | |
1311 | ||
1312 | static int | |
1313 | acl_verify_csa(uschar *domain) | |
1314 | { | |
1315 | tree_node *t; | |
1316 | uschar *found, *p; | |
1317 | int priority, weight, port; | |
1318 | dns_answer dnsa; | |
1319 | dns_scan dnss; | |
1320 | dns_record *rr; | |
1321 | int rc, type; | |
1322 | uschar target[256]; | |
1323 | ||
1324 | /* Work out the domain we are using for the CSA lookup. The default is the | |
1325 | client's HELO domain. If the client has not said HELO, use its IP address | |
1326 | instead. If it's a local client (exim -bs), CSA isn't applicable. */ | |
1327 | ||
1328 | while (isspace(*domain) && *domain != '\0') ++domain; | |
1329 | if (*domain == '\0') domain = sender_helo_name; | |
1330 | if (domain == NULL) domain = sender_host_address; | |
1331 | if (sender_host_address == NULL) return CSA_UNKNOWN; | |
1332 | ||
1333 | /* If we have an address literal, strip off the framing ready for turning it | |
1334 | into a domain. The framing consists of matched square brackets possibly | |
1335 | containing a keyword and a colon before the actual IP address. */ | |
1336 | ||
1337 | if (domain[0] == '[') | |
1338 | { | |
1339 | uschar *start = Ustrchr(domain, ':'); | |
1340 | if (start == NULL) start = domain; | |
1341 | domain = string_copyn(start + 1, Ustrlen(start) - 2); | |
1342 | } | |
1343 | ||
1344 | /* Turn domains that look like bare IP addresses into domains in the reverse | |
1345 | DNS. This code also deals with address literals and $sender_host_address. It's | |
1346 | not quite kosher to treat bare domains such as EHLO 192.0.2.57 the same as | |
1347 | address literals, but it's probably the most friendly thing to do. This is an | |
1348 | extension to CSA, so we allow it to be turned off for proper conformance. */ | |
1349 | ||
7e66e54d | 1350 | if (string_is_ip_address(domain, NULL) != 0) |
e5a9dba6 PH |
1351 | { |
1352 | if (!dns_csa_use_reverse) return CSA_UNKNOWN; | |
1353 | dns_build_reverse(domain, target); | |
1354 | domain = target; | |
1355 | } | |
1356 | ||
1357 | /* Find out if we've already done the CSA check for this domain. If we have, | |
1358 | return the same result again. Otherwise build a new cached result structure | |
1359 | for this domain. The name is filled in now, and the value is filled in when | |
1360 | we return from this function. */ | |
1361 | ||
1362 | t = tree_search(csa_cache, domain); | |
1363 | if (t != NULL) return t->data.val; | |
1364 | ||
1365 | t = store_get_perm(sizeof(tree_node) + Ustrlen(domain)); | |
1366 | Ustrcpy(t->name, domain); | |
1367 | (void)tree_insertnode(&csa_cache, t); | |
1368 | ||
1369 | /* Now we are ready to do the actual DNS lookup(s). */ | |
1370 | ||
28e6ef29 | 1371 | found = domain; |
e5a9dba6 PH |
1372 | switch (dns_special_lookup(&dnsa, domain, T_CSA, &found)) |
1373 | { | |
1374 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1375 | ||
1376 | default: | |
1377 | return t->data.val = CSA_DEFER_SRV; | |
1378 | ||
1379 | /* If we found nothing, the client's authorization is unknown. */ | |
1380 | ||
1381 | case DNS_NOMATCH: | |
1382 | case DNS_NODATA: | |
1383 | return t->data.val = CSA_UNKNOWN; | |
1384 | ||
1385 | /* We got something! Go on to look at the reply in more detail. */ | |
1386 | ||
1387 | case DNS_SUCCEED: | |
1388 | break; | |
1389 | } | |
1390 | ||
1391 | /* Scan the reply for well-formed CSA SRV records. */ | |
1392 | ||
1393 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
1394 | rr != NULL; | |
1395 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
1396 | { | |
1397 | if (rr->type != T_SRV) continue; | |
1398 | ||
1399 | /* Extract the numerical SRV fields (p is incremented) */ | |
1400 | ||
1401 | p = rr->data; | |
1402 | GETSHORT(priority, p); | |
1403 | GETSHORT(weight, p); | |
1404 | GETSHORT(port, p); | |
1405 | ||
1406 | DEBUG(D_acl) | |
1407 | debug_printf("CSA priority=%d weight=%d port=%d\n", priority, weight, port); | |
1408 | ||
1409 | /* Check the CSA version number */ | |
1410 | ||
1411 | if (priority != 1) continue; | |
1412 | ||
1413 | /* If the domain does not have a CSA SRV record of its own (i.e. the domain | |
1414 | found by dns_special_lookup() is a parent of the one we asked for), we check | |
1415 | the subdomain assertions in the port field. At the moment there's only one | |
1416 | assertion: legitimate SMTP clients are all explicitly authorized with CSA | |
1417 | SRV records of their own. */ | |
1418 | ||
1419 | if (found != domain) | |
1420 | { | |
1421 | if (port & 1) | |
1422 | return t->data.val = CSA_FAIL_EXPLICIT; | |
1423 | else | |
1424 | return t->data.val = CSA_UNKNOWN; | |
1425 | } | |
1426 | ||
1427 | /* This CSA SRV record refers directly to our domain, so we check the value | |
1428 | in the weight field to work out the domain's authorization. 0 and 1 are | |
1429 | unauthorized; 3 means the client is authorized but we can't check the IP | |
1430 | address in order to authenticate it, so we treat it as unknown; values | |
1431 | greater than 3 are undefined. */ | |
1432 | ||
1433 | if (weight < 2) return t->data.val = CSA_FAIL_DOMAIN; | |
1434 | ||
1435 | if (weight > 2) continue; | |
1436 | ||
1437 | /* Weight == 2, which means the domain is authorized. We must check that the | |
1438 | client's IP address is listed as one of the SRV target addresses. Save the | |
1439 | target hostname then break to scan the additional data for its addresses. */ | |
1440 | ||
1441 | (void)dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, | |
1442 | (DN_EXPAND_ARG4_TYPE)target, sizeof(target)); | |
1443 | ||
1444 | DEBUG(D_acl) debug_printf("CSA target is %s\n", target); | |
1445 | ||
1446 | break; | |
1447 | } | |
1448 | ||
1449 | /* If we didn't break the loop then no appropriate records were found. */ | |
1450 | ||
1451 | if (rr == NULL) return t->data.val = CSA_UNKNOWN; | |
1452 | ||
1453 | /* Do not check addresses if the target is ".", in accordance with RFC 2782. | |
1454 | A target of "." indicates there are no valid addresses, so the client cannot | |
1455 | be authorized. (This is an odd configuration because weight=2 target=. is | |
1456 | equivalent to weight=1, but we check for it in order to keep load off the | |
1457 | root name servers.) Note that dn_expand() turns "." into "". */ | |
1458 | ||
1459 | if (Ustrcmp(target, "") == 0) return t->data.val = CSA_FAIL_NOADDR; | |
1460 | ||
1461 | /* Scan the additional section of the CSA SRV reply for addresses belonging | |
1462 | to the target. If the name server didn't return any additional data (e.g. | |
1463 | because it does not fully support SRV records), we need to do another lookup | |
1464 | to obtain the target addresses; otherwise we have a definitive result. */ | |
1465 | ||
1466 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ADDITIONAL, target); | |
1467 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1468 | ||
1469 | /* The DNS lookup type corresponds to the IP version used by the client. */ | |
1470 | ||
1471 | #if HAVE_IPV6 | |
1472 | if (Ustrchr(sender_host_address, ':') != NULL) | |
1473 | type = T_AAAA; | |
1474 | else | |
1475 | #endif /* HAVE_IPV6 */ | |
1476 | type = T_A; | |
1477 | ||
1478 | ||
1479 | #if HAVE_IPV6 && defined(SUPPORT_A6) | |
1480 | DNS_LOOKUP_AGAIN: | |
1481 | #endif | |
1482 | ||
1483 | switch (dns_lookup(&dnsa, target, type, NULL)) | |
1484 | { | |
1485 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1486 | ||
1487 | default: | |
1488 | return t->data.val = CSA_DEFER_ADDR; | |
1489 | ||
1490 | /* If the query succeeded, scan the addresses and return the result. */ | |
1491 | ||
1492 | case DNS_SUCCEED: | |
1493 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ANSWERS, target); | |
1494 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1495 | /* else fall through */ | |
1496 | ||
1497 | /* If the target has no IP addresses, the client cannot have an authorized | |
1498 | IP address. However, if the target site uses A6 records (not AAAA records) | |
1499 | we have to do yet another lookup in order to check them. */ | |
1500 | ||
1501 | case DNS_NOMATCH: | |
1502 | case DNS_NODATA: | |
1503 | ||
1504 | #if HAVE_IPV6 && defined(SUPPORT_A6) | |
1505 | if (type == T_AAAA) { type = T_A6; goto DNS_LOOKUP_AGAIN; } | |
1506 | #endif | |
1507 | ||
1508 | return t->data.val = CSA_FAIL_NOADDR; | |
1509 | } | |
1510 | } | |
1511 | ||
1512 | ||
1513 | ||
059ec3d9 PH |
1514 | /************************************************* |
1515 | * Handle verification (address & other) * | |
1516 | *************************************************/ | |
1517 | ||
89583014 JH |
1518 | enum { VERIFY_REV_HOST_LKUP, VERIFY_CERT, VERIFY_HELO, VERIFY_CSA, VERIFY_HDR_SYNTAX, |
1519 | VERIFY_NOT_BLIND, VERIFY_HDR_SNDR, VERIFY_SNDR, VERIFY_RCPT | |
1520 | }; | |
1521 | typedef struct { | |
1522 | uschar * name; | |
1523 | int value; | |
1524 | unsigned where_allowed; /* bitmap */ | |
1525 | BOOL no_options; /* Never has /option(s) following */ | |
1526 | unsigned alt_opt_sep; /* >0 Non-/ option separator (custom parser) */ | |
1527 | } verify_type_t; | |
1528 | static verify_type_t verify_type_list[] = { | |
1529 | { US"reverse_host_lookup", VERIFY_REV_HOST_LKUP, ~0, TRUE, 0 }, | |
1530 | { US"certificate", VERIFY_CERT, ~0, TRUE, 0 }, | |
1531 | { US"helo", VERIFY_HELO, ~0, TRUE, 0 }, | |
1532 | { US"csa", VERIFY_CSA, ~0, FALSE, 0 }, | |
1533 | { US"header_syntax", VERIFY_HDR_SYNTAX, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), TRUE, 0 }, | |
1534 | { US"not_blind", VERIFY_NOT_BLIND, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), TRUE, 0 }, | |
1535 | { US"header_sender", VERIFY_HDR_SNDR, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), FALSE, 0 }, | |
1536 | { US"sender", VERIFY_SNDR, (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT) | |
1537 | |(1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), | |
1538 | FALSE, 6 }, | |
1539 | { US"recipient", VERIFY_RCPT, (1<<ACL_WHERE_RCPT), FALSE, 0 } | |
1540 | }; | |
1541 | ||
1542 | ||
1543 | enum { CALLOUT_DEFER_OK, CALLOUT_NOCACHE, CALLOUT_RANDOM, CALLOUT_USE_SENDER, | |
1544 | CALLOUT_USE_POSTMASTER, CALLOUT_POSTMASTER, CALLOUT_FULLPOSTMASTER, | |
1545 | CALLOUT_MAILFROM, CALLOUT_POSTMASTER_MAILFROM, CALLOUT_MAXWAIT, CALLOUT_CONNECT, | |
1546 | CALLOUT_TIME | |
1547 | }; | |
1548 | typedef struct { | |
1549 | uschar * name; | |
1550 | int value; | |
1551 | int flag; | |
1552 | BOOL has_option; /* Has =option(s) following */ | |
1553 | BOOL timeval; /* Has a time value */ | |
1554 | } callout_opt_t; | |
1555 | static callout_opt_t callout_opt_list[] = { | |
1556 | { US"defer_ok", CALLOUT_DEFER_OK, 0, FALSE, FALSE }, | |
1557 | { US"no_cache", CALLOUT_NOCACHE, vopt_callout_no_cache, FALSE, FALSE }, | |
1558 | { US"random", CALLOUT_RANDOM, vopt_callout_random, FALSE, FALSE }, | |
1559 | { US"use_sender", CALLOUT_USE_SENDER, vopt_callout_recipsender, FALSE, FALSE }, | |
1560 | { US"use_postmaster", CALLOUT_USE_POSTMASTER,vopt_callout_recippmaster, FALSE, FALSE }, | |
1561 | { US"postmaster_mailfrom",CALLOUT_POSTMASTER_MAILFROM,0, TRUE, FALSE }, | |
1562 | { US"postmaster", CALLOUT_POSTMASTER, 0, FALSE, FALSE }, | |
1563 | { US"fullpostmaster", CALLOUT_FULLPOSTMASTER,vopt_callout_fullpm, FALSE, FALSE }, | |
1564 | { US"mailfrom", CALLOUT_MAILFROM, 0, TRUE, FALSE }, | |
1565 | { US"maxwait", CALLOUT_MAXWAIT, 0, TRUE, TRUE }, | |
1566 | { US"connect", CALLOUT_CONNECT, 0, TRUE, TRUE }, | |
1567 | { NULL, CALLOUT_TIME, 0, FALSE, TRUE } | |
1568 | }; | |
1569 | ||
1570 | ||
1571 | ||
059ec3d9 PH |
1572 | /* This function implements the "verify" condition. It is called when |
1573 | encountered in any ACL, because some tests are almost always permitted. Some | |
1574 | just don't make sense, and always fail (for example, an attempt to test a host | |
1575 | lookup for a non-TCP/IP message). Others are restricted to certain ACLs. | |
1576 | ||
1577 | Arguments: | |
1578 | where where called from | |
1579 | addr the recipient address that the ACL is handling, or NULL | |
1580 | arg the argument of "verify" | |
1581 | user_msgptr pointer for user message | |
1582 | log_msgptr pointer for log message | |
1583 | basic_errno where to put verify errno | |
1584 | ||
1585 | Returns: OK verification condition succeeded | |
1586 | FAIL verification failed | |
1587 | DEFER there was a problem verifying | |
1588 | ERROR syntax error | |
1589 | */ | |
1590 | ||
1591 | static int | |
1592 | acl_verify(int where, address_item *addr, uschar *arg, | |
1593 | uschar **user_msgptr, uschar **log_msgptr, int *basic_errno) | |
1594 | { | |
1595 | int sep = '/'; | |
1596 | int callout = -1; | |
1597 | int callout_overall = -1; | |
4deaf07d | 1598 | int callout_connect = -1; |
059ec3d9 PH |
1599 | int verify_options = 0; |
1600 | int rc; | |
1601 | BOOL verify_header_sender = FALSE; | |
1602 | BOOL defer_ok = FALSE; | |
1603 | BOOL callout_defer_ok = FALSE; | |
1604 | BOOL no_details = FALSE; | |
eafd343b | 1605 | BOOL success_on_redirect = FALSE; |
059ec3d9 PH |
1606 | address_item *sender_vaddr = NULL; |
1607 | uschar *verify_sender_address = NULL; | |
1608 | uschar *pm_mailfrom = NULL; | |
1609 | uschar *se_mailfrom = NULL; | |
596875b3 PH |
1610 | |
1611 | /* Some of the verify items have slash-separated options; some do not. Diagnose | |
89583014 | 1612 | an error if options are given for items that don't expect them. |
596875b3 PH |
1613 | */ |
1614 | ||
1615 | uschar *slash = Ustrchr(arg, '/'); | |
059ec3d9 PH |
1616 | uschar *list = arg; |
1617 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
89583014 | 1618 | verify_type_t * vp; |
059ec3d9 PH |
1619 | |
1620 | if (ss == NULL) goto BAD_VERIFY; | |
1621 | ||
1622 | /* Handle name/address consistency verification in a separate function. */ | |
1623 | ||
89583014 JH |
1624 | for (vp= verify_type_list; |
1625 | (char *)vp < (char *)verify_type_list + sizeof(verify_type_list); | |
1626 | vp++ | |
1627 | ) | |
1628 | if (vp->alt_opt_sep ? strncmpic(ss, vp->name, vp->alt_opt_sep) == 0 | |
1629 | : strcmpic (ss, vp->name) == 0) | |
1630 | break; | |
1631 | if ((char *)vp >= (char *)verify_type_list + sizeof(verify_type_list)) | |
1632 | goto BAD_VERIFY; | |
1633 | ||
1634 | if (vp->no_options && slash != NULL) | |
059ec3d9 | 1635 | { |
89583014 JH |
1636 | *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" " |
1637 | "(this verify item has no options)", arg); | |
1638 | return ERROR; | |
059ec3d9 | 1639 | } |
89583014 | 1640 | if (!(vp->where_allowed & (1<<where))) |
059ec3d9 | 1641 | { |
89583014 JH |
1642 | *log_msgptr = string_sprintf("cannot verify %s in ACL for %s", vp->name, acl_wherenames[where]); |
1643 | return ERROR; | |
059ec3d9 | 1644 | } |
89583014 | 1645 | switch(vp->value) |
596875b3 | 1646 | { |
89583014 JH |
1647 | case VERIFY_REV_HOST_LKUP: |
1648 | if (sender_host_address == NULL) return OK; | |
1649 | return acl_verify_reverse(user_msgptr, log_msgptr); | |
059ec3d9 | 1650 | |
89583014 JH |
1651 | case VERIFY_CERT: |
1652 | /* TLS certificate verification is done at STARTTLS time; here we just | |
1653 | test whether it was successful or not. (This is for optional verification; for | |
1654 | mandatory verification, the connection doesn't last this long.) */ | |
e5a9dba6 | 1655 | |
817d9f57 | 1656 | if (tls_in.certificate_verified) return OK; |
89583014 JH |
1657 | *user_msgptr = US"no verified certificate"; |
1658 | return FAIL; | |
e5a9dba6 | 1659 | |
89583014 JH |
1660 | case VERIFY_HELO: |
1661 | /* We can test the result of optional HELO verification that might have | |
1662 | occurred earlier. If not, we can attempt the verification now. */ | |
059ec3d9 | 1663 | |
89583014 JH |
1664 | if (!helo_verified && !helo_verify_failed) smtp_verify_helo(); |
1665 | return helo_verified? OK : FAIL; | |
059ec3d9 | 1666 | |
89583014 JH |
1667 | case VERIFY_CSA: |
1668 | /* Do Client SMTP Authorization checks in a separate function, and turn the | |
1669 | result code into user-friendly strings. */ | |
1c41c9cc | 1670 | |
89583014 JH |
1671 | rc = acl_verify_csa(list); |
1672 | *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s", | |
1673 | csa_reason_string[rc]); | |
1674 | csa_status = csa_status_string[rc]; | |
1675 | DEBUG(D_acl) debug_printf("CSA result %s\n", csa_status); | |
1676 | return csa_return_code[rc]; | |
1677 | ||
1678 | case VERIFY_HDR_SYNTAX: | |
1679 | /* Check that all relevant header lines have the correct syntax. If there is | |
1680 | a syntax error, we return details of the error to the sender if configured to | |
1681 | send out full details. (But a "message" setting on the ACL can override, as | |
1682 | always). */ | |
1683 | ||
1684 | rc = verify_check_headers(log_msgptr); | |
1685 | if (rc != OK && smtp_return_error_details && *log_msgptr != NULL) | |
1c41c9cc | 1686 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); |
89583014 | 1687 | return rc; |
059ec3d9 | 1688 | |
89583014 JH |
1689 | case VERIFY_NOT_BLIND: |
1690 | /* Check that no recipient of this message is "blind", that is, every envelope | |
1691 | recipient must be mentioned in either To: or Cc:. */ | |
059ec3d9 | 1692 | |
89583014 JH |
1693 | rc = verify_check_notblind(); |
1694 | if (rc != OK) | |
1695 | { | |
1696 | *log_msgptr = string_sprintf("bcc recipient detected"); | |
1697 | if (smtp_return_error_details) | |
1698 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1699 | } | |
1700 | return rc; | |
059ec3d9 | 1701 | |
89583014 JH |
1702 | /* The remaining verification tests check recipient and sender addresses, |
1703 | either from the envelope or from the header. There are a number of | |
1704 | slash-separated options that are common to all of them. */ | |
059ec3d9 | 1705 | |
89583014 JH |
1706 | case VERIFY_HDR_SNDR: |
1707 | verify_header_sender = TRUE; | |
1708 | break; | |
059ec3d9 | 1709 | |
89583014 JH |
1710 | case VERIFY_SNDR: |
1711 | /* In the case of a sender, this can optionally be followed by an address to use | |
1712 | in place of the actual sender (rare special-case requirement). */ | |
059ec3d9 | 1713 | { |
89583014 JH |
1714 | uschar *s = ss + 6; |
1715 | if (*s == 0) | |
1716 | verify_sender_address = sender_address; | |
1717 | else | |
1718 | { | |
1719 | while (isspace(*s)) s++; | |
1720 | if (*s++ != '=') goto BAD_VERIFY; | |
1721 | while (isspace(*s)) s++; | |
1722 | verify_sender_address = string_copy(s); | |
1723 | } | |
059ec3d9 | 1724 | } |
89583014 JH |
1725 | break; |
1726 | ||
1727 | case VERIFY_RCPT: | |
1728 | break; | |
059ec3d9 PH |
1729 | } |
1730 | ||
89583014 JH |
1731 | |
1732 | ||
596875b3 PH |
1733 | /* Remaining items are optional; they apply to sender and recipient |
1734 | verification, including "header sender" verification. */ | |
059ec3d9 PH |
1735 | |
1736 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) | |
1737 | != NULL) | |
1738 | { | |
1739 | if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE; | |
1740 | else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE; | |
eafd343b | 1741 | else if (strcmpic(ss, US"success_on_redirect") == 0) success_on_redirect = TRUE; |
059ec3d9 PH |
1742 | |
1743 | /* These two old options are left for backwards compatibility */ | |
1744 | ||
1745 | else if (strcmpic(ss, US"callout_defer_ok") == 0) | |
1746 | { | |
1747 | callout_defer_ok = TRUE; | |
1748 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1749 | } | |
1750 | ||
1751 | else if (strcmpic(ss, US"check_postmaster") == 0) | |
1752 | { | |
1753 | pm_mailfrom = US""; | |
1754 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1755 | } | |
1756 | ||
1757 | /* The callout option has a number of sub-options, comma separated */ | |
1758 | ||
1759 | else if (strncmpic(ss, US"callout", 7) == 0) | |
1760 | { | |
1761 | callout = CALLOUT_TIMEOUT_DEFAULT; | |
1762 | ss += 7; | |
1763 | if (*ss != 0) | |
1764 | { | |
1765 | while (isspace(*ss)) ss++; | |
1766 | if (*ss++ == '=') | |
1767 | { | |
1768 | int optsep = ','; | |
1769 | uschar *opt; | |
1770 | uschar buffer[256]; | |
1771 | while (isspace(*ss)) ss++; | |
8e669ac1 | 1772 | |
059ec3d9 PH |
1773 | while ((opt = string_nextinlist(&ss, &optsep, buffer, sizeof(buffer))) |
1774 | != NULL) | |
1775 | { | |
89583014 | 1776 | callout_opt_t * op; |
438257ba | 1777 | double period = 1.0F; |
059ec3d9 | 1778 | |
89583014 | 1779 | for (op= callout_opt_list; op->name; op++) |
438257ba | 1780 | if (strncmpic(opt, op->name, Ustrlen(op->name)) == 0) |
89583014 | 1781 | break; |
059ec3d9 | 1782 | |
89583014 JH |
1783 | verify_options |= op->flag; |
1784 | if (op->has_option) | |
1785 | { | |
438257ba | 1786 | opt += Ustrlen(op->name); |
4deaf07d PH |
1787 | while (isspace(*opt)) opt++; |
1788 | if (*opt++ != '=') | |
1789 | { | |
1790 | *log_msgptr = string_sprintf("'=' expected after " | |
89583014 | 1791 | "\"%s\" in ACL verify condition \"%s\"", op->name, arg); |
4deaf07d PH |
1792 | return ERROR; |
1793 | } | |
1794 | while (isspace(*opt)) opt++; | |
89583014 JH |
1795 | } |
1796 | if (op->timeval) | |
1797 | { | |
1798 | period = readconf_readtime(opt, 0, FALSE); | |
1799 | if (period < 0) | |
4deaf07d PH |
1800 | { |
1801 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1802 | "\"verify %s\"", arg); | |
1803 | return ERROR; | |
1804 | } | |
89583014 JH |
1805 | } |
1806 | ||
1807 | switch(op->value) | |
1808 | { | |
1809 | case CALLOUT_DEFER_OK: callout_defer_ok = TRUE; break; | |
1810 | case CALLOUT_POSTMASTER: pm_mailfrom = US""; break; | |
1811 | case CALLOUT_FULLPOSTMASTER: pm_mailfrom = US""; break; | |
1812 | case CALLOUT_MAILFROM: | |
1813 | if (!verify_header_sender) | |
1814 | { | |
1815 | *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a " | |
1816 | "callout option only for verify=header_sender (detected in ACL " | |
1817 | "condition \"%s\")", arg); | |
1818 | return ERROR; | |
1819 | } | |
1820 | se_mailfrom = string_copy(opt); | |
1821 | break; | |
1822 | case CALLOUT_POSTMASTER_MAILFROM: pm_mailfrom = string_copy(opt); break; | |
1823 | case CALLOUT_MAXWAIT: callout_overall = period; break; | |
1824 | case CALLOUT_CONNECT: callout_connect = period; break; | |
1825 | case CALLOUT_TIME: callout = period; break; | |
1826 | } | |
059ec3d9 PH |
1827 | } |
1828 | } | |
1829 | else | |
1830 | { | |
1831 | *log_msgptr = string_sprintf("'=' expected after \"callout\" in " | |
1832 | "ACL condition \"%s\"", arg); | |
1833 | return ERROR; | |
1834 | } | |
1835 | } | |
1836 | } | |
1837 | ||
1838 | /* Option not recognized */ | |
1839 | ||
1840 | else | |
1841 | { | |
1842 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " | |
1843 | "condition \"verify %s\"", ss, arg); | |
1844 | return ERROR; | |
1845 | } | |
1846 | } | |
1847 | ||
1848 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == | |
1849 | (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1850 | { | |
1851 | *log_msgptr = US"only one of use_sender and use_postmaster can be set " | |
1852 | "for a recipient callout"; | |
1853 | return ERROR; | |
1854 | } | |
1855 | ||
1856 | /* Handle sender-in-header verification. Default the user message to the log | |
1857 | message if giving out verification details. */ | |
1858 | ||
1859 | if (verify_header_sender) | |
1860 | { | |
8e669ac1 | 1861 | int verrno; |
059ec3d9 | 1862 | rc = verify_check_header_address(user_msgptr, log_msgptr, callout, |
fe5b5d0b PH |
1863 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, verify_options, |
1864 | &verrno); | |
1865 | if (rc != OK) | |
8e669ac1 | 1866 | { |
fe5b5d0b PH |
1867 | *basic_errno = verrno; |
1868 | if (smtp_return_error_details) | |
1869 | { | |
1870 | if (*user_msgptr == NULL && *log_msgptr != NULL) | |
1871 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1872 | if (rc == DEFER) acl_temp_details = TRUE; | |
1873 | } | |
8e669ac1 | 1874 | } |
059ec3d9 PH |
1875 | } |
1876 | ||
1877 | /* Handle a sender address. The default is to verify *the* sender address, but | |
1878 | optionally a different address can be given, for special requirements. If the | |
1879 | address is empty, we are dealing with a bounce message that has no sender, so | |
1880 | we cannot do any checking. If the real sender address gets rewritten during | |
1881 | verification (e.g. DNS widening), set the flag to stop it being rewritten again | |
1882 | during message reception. | |
1883 | ||
1884 | A list of verified "sender" addresses is kept to try to avoid doing to much | |
1885 | work repetitively when there are multiple recipients in a message and they all | |
1886 | require sender verification. However, when callouts are involved, it gets too | |
1887 | complicated because different recipients may require different callout options. | |
1888 | Therefore, we always do a full sender verify when any kind of callout is | |
1889 | specified. Caching elsewhere, for instance in the DNS resolver and in the | |
1890 | callout handling, should ensure that this is not terribly inefficient. */ | |
1891 | ||
1892 | else if (verify_sender_address != NULL) | |
1893 | { | |
1894 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1895 | != 0) | |
1896 | { | |
1897 | *log_msgptr = US"use_sender or use_postmaster cannot be used for a " | |
1898 | "sender verify callout"; | |
1899 | return ERROR; | |
1900 | } | |
1901 | ||
1902 | sender_vaddr = verify_checked_sender(verify_sender_address); | |
1903 | if (sender_vaddr != NULL && /* Previously checked */ | |
1904 | callout <= 0) /* No callout needed this time */ | |
1905 | { | |
1906 | /* If the "routed" flag is set, it means that routing worked before, so | |
1907 | this check can give OK (the saved return code value, if set, belongs to a | |
1908 | callout that was done previously). If the "routed" flag is not set, routing | |
1909 | must have failed, so we use the saved return code. */ | |
1910 | ||
1911 | if (testflag(sender_vaddr, af_verify_routed)) rc = OK; else | |
1912 | { | |
1913 | rc = sender_vaddr->special_action; | |
1914 | *basic_errno = sender_vaddr->basic_errno; | |
1915 | } | |
1916 | HDEBUG(D_acl) debug_printf("using cached sender verify result\n"); | |
1917 | } | |
1918 | ||
1919 | /* Do a new verification, and cache the result. The cache is used to avoid | |
1920 | verifying the sender multiple times for multiple RCPTs when callouts are not | |
1921 | specified (see comments above). | |
1922 | ||
1923 | The cache is also used on failure to give details in response to the first | |
1924 | RCPT that gets bounced for this reason. However, this can be suppressed by | |
1925 | the no_details option, which sets the flag that says "this detail has already | |
1926 | been sent". The cache normally contains just one address, but there may be | |
1927 | more in esoteric circumstances. */ | |
1928 | ||
1929 | else | |
1930 | { | |
1931 | BOOL routed = TRUE; | |
2a3eea10 | 1932 | uschar *save_address_data = deliver_address_data; |
8e669ac1 | 1933 | |
059ec3d9 PH |
1934 | sender_vaddr = deliver_make_addr(verify_sender_address, TRUE); |
1935 | if (no_details) setflag(sender_vaddr, af_sverify_told); | |
1936 | if (verify_sender_address[0] != 0) | |
1937 | { | |
1938 | /* If this is the real sender address, save the unrewritten version | |
1939 | for use later in receive. Otherwise, set a flag so that rewriting the | |
1940 | sender in verify_address() does not update sender_address. */ | |
1941 | ||
1942 | if (verify_sender_address == sender_address) | |
1943 | sender_address_unrewritten = sender_address; | |
1944 | else | |
1945 | verify_options |= vopt_fake_sender; | |
1946 | ||
eafd343b TK |
1947 | if (success_on_redirect) |
1948 | verify_options |= vopt_success_on_redirect; | |
1949 | ||
059ec3d9 PH |
1950 | /* The recipient, qualify, and expn options are never set in |
1951 | verify_options. */ | |
1952 | ||
1953 | rc = verify_address(sender_vaddr, NULL, verify_options, callout, | |
4deaf07d | 1954 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, &routed); |
059ec3d9 PH |
1955 | |
1956 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); | |
1957 | ||
1958 | if (rc == OK) | |
1959 | { | |
1960 | if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0) | |
1961 | { | |
1962 | DEBUG(D_acl) debug_printf("sender %s verified ok as %s\n", | |
1963 | verify_sender_address, sender_vaddr->address); | |
1964 | } | |
1965 | else | |
1966 | { | |
1967 | DEBUG(D_acl) debug_printf("sender %s verified ok\n", | |
1968 | verify_sender_address); | |
1969 | } | |
1970 | } | |
1971 | else *basic_errno = sender_vaddr->basic_errno; | |
1972 | } | |
1973 | else rc = OK; /* Null sender */ | |
1974 | ||
1975 | /* Cache the result code */ | |
1976 | ||
1977 | if (routed) setflag(sender_vaddr, af_verify_routed); | |
1978 | if (callout > 0) setflag(sender_vaddr, af_verify_callout); | |
1979 | sender_vaddr->special_action = rc; | |
1980 | sender_vaddr->next = sender_verified_list; | |
1981 | sender_verified_list = sender_vaddr; | |
8e669ac1 PH |
1982 | |
1983 | /* Restore the recipient address data, which might have been clobbered by | |
2a3eea10 | 1984 | the sender verification. */ |
8e669ac1 | 1985 | |
2a3eea10 | 1986 | deliver_address_data = save_address_data; |
059ec3d9 | 1987 | } |
8e669ac1 | 1988 | |
2a3eea10 PH |
1989 | /* Put the sender address_data value into $sender_address_data */ |
1990 | ||
8e669ac1 | 1991 | sender_address_data = sender_vaddr->p.address_data; |
059ec3d9 PH |
1992 | } |
1993 | ||
1994 | /* A recipient address just gets a straightforward verify; again we must handle | |
1995 | the DEFER overrides. */ | |
1996 | ||
1997 | else | |
1998 | { | |
1999 | address_item addr2; | |
2000 | ||
eafd343b TK |
2001 | if (success_on_redirect) |
2002 | verify_options |= vopt_success_on_redirect; | |
2003 | ||
059ec3d9 PH |
2004 | /* We must use a copy of the address for verification, because it might |
2005 | get rewritten. */ | |
2006 | ||
2007 | addr2 = *addr; | |
2008 | rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout, | |
4deaf07d | 2009 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, NULL); |
059ec3d9 | 2010 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); |
8e669ac1 | 2011 | |
42855d71 | 2012 | *basic_errno = addr2.basic_errno; |
059ec3d9 | 2013 | *log_msgptr = addr2.message; |
8e669ac1 | 2014 | *user_msgptr = (addr2.user_message != NULL)? |
6729cf78 | 2015 | addr2.user_message : addr2.message; |
42855d71 PH |
2016 | |
2017 | /* Allow details for temporary error if the address is so flagged. */ | |
2018 | if (testflag((&addr2), af_pass_message)) acl_temp_details = TRUE; | |
059ec3d9 PH |
2019 | |
2020 | /* Make $address_data visible */ | |
2021 | deliver_address_data = addr2.p.address_data; | |
2022 | } | |
2023 | ||
2024 | /* We have a result from the relevant test. Handle defer overrides first. */ | |
2025 | ||
2026 | if (rc == DEFER && (defer_ok || | |
2027 | (callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER))) | |
2028 | { | |
2029 | HDEBUG(D_acl) debug_printf("verify defer overridden by %s\n", | |
2030 | defer_ok? "defer_ok" : "callout_defer_ok"); | |
2031 | rc = OK; | |
2032 | } | |
2033 | ||
2034 | /* If we've failed a sender, set up a recipient message, and point | |
2035 | sender_verified_failed to the address item that actually failed. */ | |
2036 | ||
2037 | if (rc != OK && verify_sender_address != NULL) | |
2038 | { | |
2039 | if (rc != DEFER) | |
2040 | { | |
2041 | *log_msgptr = *user_msgptr = US"Sender verify failed"; | |
2042 | } | |
2043 | else if (*basic_errno != ERRNO_CALLOUTDEFER) | |
2044 | { | |
2045 | *log_msgptr = *user_msgptr = US"Could not complete sender verify"; | |
2046 | } | |
2047 | else | |
2048 | { | |
2049 | *log_msgptr = US"Could not complete sender verify callout"; | |
2050 | *user_msgptr = smtp_return_error_details? sender_vaddr->user_message : | |
2051 | *log_msgptr; | |
2052 | } | |
2053 | ||
2054 | sender_verified_failed = sender_vaddr; | |
2055 | } | |
2056 | ||
2057 | /* Verifying an address messes up the values of $domain and $local_part, | |
2058 | so reset them before returning if this is a RCPT ACL. */ | |
2059 | ||
2060 | if (addr != NULL) | |
2061 | { | |
2062 | deliver_domain = addr->domain; | |
2063 | deliver_localpart = addr->local_part; | |
2064 | } | |
2065 | return rc; | |
2066 | ||
2067 | /* Syntax errors in the verify argument come here. */ | |
2068 | ||
2069 | BAD_VERIFY: | |
2070 | *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", " | |
596875b3 PH |
2071 | "\"helo\", \"header_syntax\", \"header_sender\" or " |
2072 | "\"reverse_host_lookup\" at start of ACL condition " | |
059ec3d9 PH |
2073 | "\"verify %s\"", arg); |
2074 | return ERROR; | |
2075 | } | |
2076 | ||
2077 | ||
2078 | ||
2079 | ||
2080 | /************************************************* | |
2081 | * Check argument for control= modifier * | |
2082 | *************************************************/ | |
2083 | ||
2084 | /* Called from acl_check_condition() below | |
2085 | ||
2086 | Arguments: | |
2087 | arg the argument string for control= | |
2088 | pptr set to point to the terminating character | |
2089 | where which ACL we are in | |
2090 | log_msgptr for error messages | |
2091 | ||
2092 | Returns: CONTROL_xxx value | |
2093 | */ | |
2094 | ||
2095 | static int | |
2096 | decode_control(uschar *arg, uschar **pptr, int where, uschar **log_msgptr) | |
2097 | { | |
2098 | int len; | |
2099 | control_def *d; | |
2100 | ||
2101 | for (d = controls_list; | |
2102 | d < controls_list + sizeof(controls_list)/sizeof(control_def); | |
2103 | d++) | |
2104 | { | |
2105 | len = Ustrlen(d->name); | |
2106 | if (Ustrncmp(d->name, arg, len) == 0) break; | |
2107 | } | |
2108 | ||
2109 | if (d >= controls_list + sizeof(controls_list)/sizeof(control_def) || | |
2110 | (arg[len] != 0 && (!d->has_option || arg[len] != '/'))) | |
2111 | { | |
2112 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2113 | return CONTROL_ERROR; | |
2114 | } | |
2115 | ||
059ec3d9 PH |
2116 | *pptr = arg + len; |
2117 | return d->value; | |
2118 | } | |
2119 | ||
2120 | ||
2121 | ||
c99ce5c9 TF |
2122 | |
2123 | /************************************************* | |
2124 | * Return a ratelimit error * | |
2125 | *************************************************/ | |
2126 | ||
2127 | /* Called from acl_ratelimit() below | |
2128 | ||
2129 | Arguments: | |
2130 | log_msgptr for error messages | |
2131 | format format string | |
2132 | ... supplementary arguments | |
2133 | ss ratelimit option name | |
2134 | where ACL_WHERE_xxxx indicating which ACL this is | |
2135 | ||
2136 | Returns: ERROR | |
2137 | */ | |
2138 | ||
2139 | static int | |
2140 | ratelimit_error(uschar **log_msgptr, const char *format, ...) | |
2141 | { | |
2142 | va_list ap; | |
2143 | uschar buffer[STRING_SPRINTF_BUFFER_SIZE]; | |
2144 | va_start(ap, format); | |
2145 | if (!string_vformat(buffer, sizeof(buffer), format, ap)) | |
2146 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
ef840681 | 2147 | "string_sprintf expansion was longer than " SIZE_T_FMT, sizeof(buffer)); |
c99ce5c9 TF |
2148 | va_end(ap); |
2149 | *log_msgptr = string_sprintf( | |
2150 | "error in arguments to \"ratelimit\" condition: %s", buffer); | |
2151 | return ERROR; | |
2152 | } | |
2153 | ||
2154 | ||
2155 | ||
2156 | ||
870f6ba8 TF |
2157 | /************************************************* |
2158 | * Handle rate limiting * | |
2159 | *************************************************/ | |
2160 | ||
2161 | /* Called by acl_check_condition() below to calculate the result | |
2162 | of the ACL ratelimit condition. | |
2163 | ||
2164 | Note that the return value might be slightly unexpected: if the | |
2165 | sender's rate is above the limit then the result is OK. This is | |
2166 | similar to the dnslists condition, and is so that you can write | |
2167 | ACL clauses like: defer ratelimit = 15 / 1h | |
2168 | ||
2169 | Arguments: | |
2170 | arg the option string for ratelimit= | |
90fc3069 | 2171 | where ACL_WHERE_xxxx indicating which ACL this is |
870f6ba8 TF |
2172 | log_msgptr for error messages |
2173 | ||
2174 | Returns: OK - Sender's rate is above limit | |
2175 | FAIL - Sender's rate is below limit | |
2176 | DEFER - Problem opening ratelimit database | |
2177 | ERROR - Syntax error in options. | |
2178 | */ | |
2179 | ||
2180 | static int | |
90fc3069 | 2181 | acl_ratelimit(uschar *arg, int where, uschar **log_msgptr) |
870f6ba8 | 2182 | { |
c99ce5c9 | 2183 | double limit, period, count; |
8f240103 PH |
2184 | uschar *ss; |
2185 | uschar *key = NULL; | |
c99ce5c9 | 2186 | uschar *unique = NULL; |
870f6ba8 | 2187 | int sep = '/'; |
c99ce5c9 TF |
2188 | BOOL leaky = FALSE, strict = FALSE, readonly = FALSE; |
2189 | BOOL noupdate = FALSE, badacl = FALSE; | |
2190 | int mode = RATE_PER_WHAT; | |
870f6ba8 TF |
2191 | int old_pool, rc; |
2192 | tree_node **anchor, *t; | |
2193 | open_db dbblock, *dbm; | |
c99ce5c9 | 2194 | int dbdb_size; |
870f6ba8 | 2195 | dbdata_ratelimit *dbd; |
c99ce5c9 | 2196 | dbdata_ratelimit_unique *dbdb; |
870f6ba8 TF |
2197 | struct timeval tv; |
2198 | ||
2199 | /* Parse the first two options and record their values in expansion | |
2200 | variables. These variables allow the configuration to have informative | |
2201 | error messages based on rate limits obtained from a table lookup. */ | |
2202 | ||
c99ce5c9 | 2203 | /* First is the maximum number of messages per period / maximum burst |
870f6ba8 TF |
2204 | size, which must be greater than or equal to zero. Zero is useful for |
2205 | rate measurement as opposed to rate limiting. */ | |
2206 | ||
2207 | sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0); | |
2208 | if (sender_rate_limit == NULL) | |
2209 | limit = -1.0; | |
2210 | else | |
2211 | { | |
2212 | limit = Ustrtod(sender_rate_limit, &ss); | |
2213 | if (tolower(*ss) == 'k') { limit *= 1024.0; ss++; } | |
2214 | else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; } | |
2215 | else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; } | |
2216 | } | |
c99ce5c9 TF |
2217 | if (limit < 0.0 || *ss != '\0') |
2218 | return ratelimit_error(log_msgptr, | |
2219 | "\"%s\" is not a positive number", sender_rate_limit); | |
870f6ba8 | 2220 | |
c99ce5c9 | 2221 | /* Second is the rate measurement period / exponential smoothing time |
870f6ba8 TF |
2222 | constant. This must be strictly greater than zero, because zero leads to |
2223 | run-time division errors. */ | |
2224 | ||
2225 | sender_rate_period = string_nextinlist(&arg, &sep, NULL, 0); | |
2226 | if (sender_rate_period == NULL) period = -1.0; | |
2227 | else period = readconf_readtime(sender_rate_period, 0, FALSE); | |
2228 | if (period <= 0.0) | |
c99ce5c9 TF |
2229 | return ratelimit_error(log_msgptr, |
2230 | "\"%s\" is not a time value", sender_rate_period); | |
2231 | ||
2232 | /* By default we are counting one of something, but the per_rcpt, | |
2233 | per_byte, and count options can change this. */ | |
2234 | ||
2235 | count = 1.0; | |
870f6ba8 | 2236 | |
c99ce5c9 | 2237 | /* Parse the other options. */ |
870f6ba8 TF |
2238 | |
2239 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2240 | != NULL) | |
2241 | { | |
2242 | if (strcmpic(ss, US"leaky") == 0) leaky = TRUE; | |
2243 | else if (strcmpic(ss, US"strict") == 0) strict = TRUE; | |
8f240103 | 2244 | else if (strcmpic(ss, US"noupdate") == 0) noupdate = TRUE; |
c99ce5c9 TF |
2245 | else if (strcmpic(ss, US"readonly") == 0) readonly = TRUE; |
2246 | else if (strcmpic(ss, US"per_cmd") == 0) RATE_SET(mode, PER_CMD); | |
2247 | else if (strcmpic(ss, US"per_conn") == 0) | |
2248 | { | |
2249 | RATE_SET(mode, PER_CONN); | |
2250 | if (where == ACL_WHERE_NOTSMTP || where == ACL_WHERE_NOTSMTP_START) | |
2251 | badacl = TRUE; | |
2252 | } | |
2253 | else if (strcmpic(ss, US"per_mail") == 0) | |
2254 | { | |
2255 | RATE_SET(mode, PER_MAIL); | |
2256 | if (where > ACL_WHERE_NOTSMTP) badacl = TRUE; | |
2257 | } | |
2258 | else if (strcmpic(ss, US"per_rcpt") == 0) | |
2259 | { | |
2260 | /* If we are running in the RCPT ACL, then we'll count the recipients | |
2261 | one by one, but if we are running when we have accumulated the whole | |
2262 | list then we'll add them all in one batch. */ | |
2263 | if (where == ACL_WHERE_RCPT) | |
2264 | RATE_SET(mode, PER_RCPT); | |
2265 | else if (where >= ACL_WHERE_PREDATA && where <= ACL_WHERE_NOTSMTP) | |
2266 | RATE_SET(mode, PER_ALLRCPTS), count = (double)recipients_count; | |
2267 | else if (where == ACL_WHERE_MAIL || where > ACL_WHERE_NOTSMTP) | |
2268 | RATE_SET(mode, PER_RCPT), badacl = TRUE; | |
2269 | } | |
2270 | else if (strcmpic(ss, US"per_byte") == 0) | |
2271 | { | |
2272 | /* If we have not yet received the message data and there was no SIZE | |
2273 | declaration on the MAIL comand, then it's safe to just use a value of | |
2274 | zero and let the recorded rate decay as if nothing happened. */ | |
2275 | RATE_SET(mode, PER_MAIL); | |
2276 | if (where > ACL_WHERE_NOTSMTP) badacl = TRUE; | |
2277 | else count = message_size < 0 ? 0.0 : (double)message_size; | |
2278 | } | |
2279 | else if (strcmpic(ss, US"per_addr") == 0) | |
2280 | { | |
2281 | RATE_SET(mode, PER_RCPT); | |
438257ba | 2282 | if (where != ACL_WHERE_RCPT) badacl = TRUE, unique = US"*"; |
c99ce5c9 TF |
2283 | else unique = string_sprintf("%s@%s", deliver_localpart, deliver_domain); |
2284 | } | |
2285 | else if (strncmpic(ss, US"count=", 6) == 0) | |
2286 | { | |
2287 | uschar *e; | |
2288 | count = Ustrtod(ss+6, &e); | |
2289 | if (count < 0.0 || *e != '\0') | |
2290 | return ratelimit_error(log_msgptr, | |
2291 | "\"%s\" is not a positive number", ss); | |
2292 | } | |
2293 | else if (strncmpic(ss, US"unique=", 7) == 0) | |
2294 | unique = string_copy(ss + 7); | |
2295 | else if (key == NULL) | |
2296 | key = string_copy(ss); | |
2297 | else | |
2298 | key = string_sprintf("%s/%s", key, ss); | |
870f6ba8 TF |
2299 | } |
2300 | ||
c99ce5c9 TF |
2301 | /* Sanity check. When the badacl flag is set the update mode must either |
2302 | be readonly (which is the default if it is omitted) or, for backwards | |
2303 | compatibility, a combination of noupdate and strict or leaky. */ | |
2304 | ||
2305 | if (mode == RATE_PER_CLASH) | |
2306 | return ratelimit_error(log_msgptr, "conflicting per_* options"); | |
2307 | if (leaky + strict + readonly > 1) | |
2308 | return ratelimit_error(log_msgptr, "conflicting update modes"); | |
2309 | if (badacl && (leaky || strict) && !noupdate) | |
2310 | return ratelimit_error(log_msgptr, | |
2311 | "\"%s\" must not have /leaky or /strict option in %s ACL", | |
2312 | ratelimit_option_string[mode], acl_wherenames[where]); | |
2313 | ||
2314 | /* Set the default values of any unset options. In readonly mode we | |
2315 | perform the rate computation without any increment so that its value | |
2316 | decays to eventually allow over-limit senders through. */ | |
2317 | ||
2318 | if (noupdate) readonly = TRUE, leaky = strict = FALSE; | |
2319 | if (badacl) readonly = TRUE; | |
2320 | if (readonly) count = 0.0; | |
2321 | if (!strict && !readonly) leaky = TRUE; | |
2322 | if (mode == RATE_PER_WHAT) mode = RATE_PER_MAIL; | |
870f6ba8 | 2323 | |
8f240103 PH |
2324 | /* Create the lookup key. If there is no explicit key, use sender_host_address. |
2325 | If there is no sender_host_address (e.g. -bs or acl_not_smtp) then we simply | |
2326 | omit it. The smoothing constant (sender_rate_period) and the per_xxx options | |
2327 | are added to the key because they alter the meaning of the stored data. */ | |
2328 | ||
2329 | if (key == NULL) | |
2330 | key = (sender_host_address == NULL)? US"" : sender_host_address; | |
870f6ba8 | 2331 | |
c99ce5c9 | 2332 | key = string_sprintf("%s/%s/%s%s", |
8f240103 | 2333 | sender_rate_period, |
c99ce5c9 TF |
2334 | ratelimit_option_string[mode], |
2335 | unique == NULL ? "" : "unique/", | |
8f240103 | 2336 | key); |
870f6ba8 | 2337 | |
c99ce5c9 TF |
2338 | HDEBUG(D_acl) |
2339 | debug_printf("ratelimit condition count=%.0f %.1f/%s\n", count, limit, key); | |
870f6ba8 | 2340 | |
8f240103 PH |
2341 | /* See if we have already computed the rate by looking in the relevant tree. |
2342 | For per-connection rate limiting, store tree nodes and dbdata in the permanent | |
c99ce5c9 TF |
2343 | pool so that they survive across resets. In readonly mode we only remember the |
2344 | result for the rest of this command in case a later command changes it. After | |
2345 | this bit of logic the code is independent of the per_* mode. */ | |
870f6ba8 | 2346 | |
870f6ba8 TF |
2347 | old_pool = store_pool; |
2348 | ||
c99ce5c9 TF |
2349 | if (readonly) |
2350 | anchor = &ratelimiters_cmd; | |
2351 | else switch(mode) { | |
2352 | case RATE_PER_CONN: | |
870f6ba8 TF |
2353 | anchor = &ratelimiters_conn; |
2354 | store_pool = POOL_PERM; | |
c99ce5c9 TF |
2355 | break; |
2356 | case RATE_PER_BYTE: | |
2357 | case RATE_PER_MAIL: | |
2358 | case RATE_PER_ALLRCPTS: | |
870f6ba8 | 2359 | anchor = &ratelimiters_mail; |
c99ce5c9 TF |
2360 | break; |
2361 | case RATE_PER_ADDR: | |
2362 | case RATE_PER_CMD: | |
2363 | case RATE_PER_RCPT: | |
fe0dab11 | 2364 | anchor = &ratelimiters_cmd; |
c99ce5c9 TF |
2365 | break; |
2366 | default: | |
3399bb60 | 2367 | anchor = NULL; /* silence an "unused" complaint */ |
c99ce5c9 TF |
2368 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, |
2369 | "internal ACL error: unknown ratelimit mode %d", mode); | |
2370 | break; | |
2371 | } | |
870f6ba8 | 2372 | |
c99ce5c9 TF |
2373 | t = tree_search(*anchor, key); |
2374 | if (t != NULL) | |
870f6ba8 TF |
2375 | { |
2376 | dbd = t->data.ptr; | |
2377 | /* The following few lines duplicate some of the code below. */ | |
8f240103 | 2378 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2379 | store_pool = old_pool; |
2380 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2381 | HDEBUG(D_acl) | |
2382 | debug_printf("ratelimit found pre-computed rate %s\n", sender_rate); | |
2383 | return rc; | |
2384 | } | |
2385 | ||
c99ce5c9 TF |
2386 | /* We aren't using a pre-computed rate, so get a previously recorded rate |
2387 | from the database, which will be updated and written back if required. */ | |
870f6ba8 TF |
2388 | |
2389 | dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE); | |
2390 | if (dbm == NULL) | |
2391 | { | |
2392 | store_pool = old_pool; | |
2393 | sender_rate = NULL; | |
2394 | HDEBUG(D_acl) debug_printf("ratelimit database not available\n"); | |
2395 | *log_msgptr = US"ratelimit database not available"; | |
2396 | return DEFER; | |
2397 | } | |
c99ce5c9 TF |
2398 | dbdb = dbfn_read_with_length(dbm, key, &dbdb_size); |
2399 | dbd = NULL; | |
870f6ba8 TF |
2400 | |
2401 | gettimeofday(&tv, NULL); | |
2402 | ||
c99ce5c9 TF |
2403 | if (dbdb != NULL) |
2404 | { | |
2405 | /* Locate the basic ratelimit block inside the DB data. */ | |
2406 | HDEBUG(D_acl) debug_printf("ratelimit found key in database\n"); | |
2407 | dbd = &dbdb->dbd; | |
2408 | ||
2409 | /* Forget the old Bloom filter if it is too old, so that we count each | |
2410 | repeating event once per period. We don't simply clear and re-use the old | |
2411 | filter because we want its size to change if the limit changes. Note that | |
2412 | we keep the dbd pointer for copying the rate into the new data block. */ | |
2413 | ||
2414 | if(unique != NULL && tv.tv_sec > dbdb->bloom_epoch + period) | |
2415 | { | |
2416 | HDEBUG(D_acl) debug_printf("ratelimit discarding old Bloom filter\n"); | |
2417 | dbdb = NULL; | |
2418 | } | |
2419 | ||
2420 | /* Sanity check. */ | |
2421 | ||
2422 | if(unique != NULL && dbdb_size < sizeof(*dbdb)) | |
2423 | { | |
2424 | HDEBUG(D_acl) debug_printf("ratelimit discarding undersize Bloom filter\n"); | |
2425 | dbdb = NULL; | |
2426 | } | |
2427 | } | |
2428 | ||
2429 | /* Allocate a new data block if the database lookup failed | |
2430 | or the Bloom filter passed its age limit. */ | |
2431 | ||
2432 | if (dbdb == NULL) | |
2433 | { | |
2434 | if (unique == NULL) | |
2435 | { | |
2436 | /* No Bloom filter. This basic ratelimit block is initialized below. */ | |
2437 | HDEBUG(D_acl) debug_printf("ratelimit creating new rate data block\n"); | |
2438 | dbdb_size = sizeof(*dbd); | |
2439 | dbdb = store_get(dbdb_size); | |
2440 | } | |
2441 | else | |
2442 | { | |
2443 | int extra; | |
2444 | HDEBUG(D_acl) debug_printf("ratelimit creating new Bloom filter\n"); | |
2445 | ||
2446 | /* See the long comment below for an explanation of the magic number 2. | |
2447 | The filter has a minimum size in case the rate limit is very small; | |
2448 | this is determined by the definition of dbdata_ratelimit_unique. */ | |
2449 | ||
2450 | extra = (int)limit * 2 - sizeof(dbdb->bloom); | |
2451 | if (extra < 0) extra = 0; | |
2452 | dbdb_size = sizeof(*dbdb) + extra; | |
2453 | dbdb = store_get(dbdb_size); | |
2454 | dbdb->bloom_epoch = tv.tv_sec; | |
2455 | dbdb->bloom_size = sizeof(dbdb->bloom) + extra; | |
2456 | memset(dbdb->bloom, 0, dbdb->bloom_size); | |
2457 | ||
2458 | /* Preserve any basic ratelimit data (which is our longer-term memory) | |
2459 | by copying it from the discarded block. */ | |
2460 | ||
2461 | if (dbd != NULL) | |
2462 | { | |
2463 | dbdb->dbd = *dbd; | |
2464 | dbd = &dbdb->dbd; | |
2465 | } | |
2466 | } | |
2467 | } | |
2468 | ||
2469 | /* If we are counting unique events, find out if this event is new or not. | |
2470 | If the client repeats the event during the current period then it should be | |
2471 | counted. We skip this code in readonly mode for efficiency, because any | |
2472 | changes to the filter will be discarded and because count is already set to | |
2473 | zero. */ | |
2474 | ||
2475 | if (unique != NULL && !readonly) | |
2476 | { | |
2477 | /* We identify unique events using a Bloom filter. (You can find my | |
2478 | notes on Bloom filters at http://fanf.livejournal.com/81696.html) | |
2479 | With the per_addr option, an "event" is a recipient address, though the | |
2480 | user can use the unique option to define their own events. We only count | |
2481 | an event if we have not seen it before. | |
2482 | ||
2483 | We size the filter according to the rate limit, which (in leaky mode) | |
2484 | is the limit on the population of the filter. We allow 16 bits of space | |
2485 | per entry (see the construction code above) and we set (up to) 8 of them | |
2486 | when inserting an element (see the loop below). The probability of a false | |
2487 | positive (an event we have not seen before but which we fail to count) is | |
2488 | ||
2489 | size = limit * 16 | |
2490 | numhash = 8 | |
2491 | allzero = exp(-numhash * pop / size) | |
2492 | = exp(-0.5 * pop / limit) | |
2493 | fpr = pow(1 - allzero, numhash) | |
2494 | ||
2495 | For senders at the limit the fpr is 0.06% or 1 in 1700 | |
2496 | and for senders at half the limit it is 0.0006% or 1 in 170000 | |
2497 | ||
2498 | In strict mode the Bloom filter can fill up beyond the normal limit, in | |
2499 | which case the false positive rate will rise. This means that the | |
2500 | measured rate for very fast senders can bogusly drop off after a while. | |
2501 | ||
2502 | At twice the limit, the fpr is 2.5% or 1 in 40 | |
2503 | At four times the limit, it is 31% or 1 in 3.2 | |
2504 | ||
2505 | It takes ln(pop/limit) periods for an over-limit burst of pop events to | |
2506 | decay below the limit, and if this is more than one then the Bloom filter | |
2507 | will be discarded before the decay gets that far. The false positive rate | |
2508 | at this threshold is 9.3% or 1 in 10.7. */ | |
2509 | ||
2510 | BOOL seen; | |
2511 | unsigned n, hash, hinc; | |
2512 | uschar md5sum[16]; | |
2513 | md5 md5info; | |
2514 | ||
2515 | /* Instead of using eight independent hash values, we combine two values | |
2516 | using the formula h1 + n * h2. This does not harm the Bloom filter's | |
2517 | performance, and means the amount of hash we need is independent of the | |
2518 | number of bits we set in the filter. */ | |
2519 | ||
2520 | md5_start(&md5info); | |
2521 | md5_end(&md5info, unique, Ustrlen(unique), md5sum); | |
2522 | hash = md5sum[0] | md5sum[1] << 8 | md5sum[2] << 16 | md5sum[3] << 24; | |
2523 | hinc = md5sum[4] | md5sum[5] << 8 | md5sum[6] << 16 | md5sum[7] << 24; | |
2524 | ||
2525 | /* Scan the bits corresponding to this event. A zero bit means we have | |
2526 | not seen it before. Ensure all bits are set to record this event. */ | |
2527 | ||
2528 | HDEBUG(D_acl) debug_printf("ratelimit checking uniqueness of %s\n", unique); | |
2529 | ||
2530 | seen = TRUE; | |
2531 | for (n = 0; n < 8; n++, hash += hinc) | |
2532 | { | |
2533 | int bit = 1 << (hash % 8); | |
2534 | int byte = (hash / 8) % dbdb->bloom_size; | |
2535 | if ((dbdb->bloom[byte] & bit) == 0) | |
2536 | { | |
2537 | dbdb->bloom[byte] |= bit; | |
2538 | seen = FALSE; | |
2539 | } | |
2540 | } | |
2541 | ||
2542 | /* If this event has occurred before, do not count it. */ | |
2543 | ||
2544 | if (seen) | |
2545 | { | |
2546 | HDEBUG(D_acl) debug_printf("ratelimit event found in Bloom filter\n"); | |
2547 | count = 0.0; | |
2548 | } | |
2549 | else | |
2550 | HDEBUG(D_acl) debug_printf("ratelimit event added to Bloom filter\n"); | |
2551 | } | |
2552 | ||
2553 | /* If there was no previous ratelimit data block for this key, initialize | |
2554 | the new one, otherwise update the block from the database. The initial rate | |
2555 | is what would be computed by the code below for an infinite interval. */ | |
2556 | ||
870f6ba8 TF |
2557 | if (dbd == NULL) |
2558 | { | |
c99ce5c9 TF |
2559 | HDEBUG(D_acl) debug_printf("ratelimit initializing new key's rate data\n"); |
2560 | dbd = &dbdb->dbd; | |
870f6ba8 TF |
2561 | dbd->time_stamp = tv.tv_sec; |
2562 | dbd->time_usec = tv.tv_usec; | |
c99ce5c9 | 2563 | dbd->rate = count; |
870f6ba8 TF |
2564 | } |
2565 | else | |
2566 | { | |
2567 | /* The smoothed rate is computed using an exponentially weighted moving | |
2568 | average adjusted for variable sampling intervals. The standard EWMA for | |
2569 | a fixed sampling interval is: f'(t) = (1 - a) * f(t) + a * f'(t - 1) | |
2570 | where f() is the measured value and f'() is the smoothed value. | |
2571 | ||
2572 | Old data decays out of the smoothed value exponentially, such that data n | |
2573 | samples old is multiplied by a^n. The exponential decay time constant p | |
2574 | is defined such that data p samples old is multiplied by 1/e, which means | |
2575 | that a = exp(-1/p). We can maintain the same time constant for a variable | |
2576 | sampling interval i by using a = exp(-i/p). | |
2577 | ||
2578 | The rate we are measuring is messages per period, suitable for directly | |
2579 | comparing with the limit. The average rate between now and the previous | |
2580 | message is period / interval, which we feed into the EWMA as the sample. | |
2581 | ||
2582 | It turns out that the number of messages required for the smoothed rate | |
2583 | to reach the limit when they are sent in a burst is equal to the limit. | |
2584 | This can be seen by analysing the value of the smoothed rate after N | |
2585 | messages sent at even intervals. Let k = (1 - a) * p/i | |
2586 | ||
2587 | rate_1 = (1 - a) * p/i + a * rate_0 | |
2588 | = k + a * rate_0 | |
2589 | rate_2 = k + a * rate_1 | |
2590 | = k + a * k + a^2 * rate_0 | |
2591 | rate_3 = k + a * k + a^2 * k + a^3 * rate_0 | |
2592 | rate_N = rate_0 * a^N + k * SUM(x=0..N-1)(a^x) | |
2593 | = rate_0 * a^N + k * (1 - a^N) / (1 - a) | |
2594 | = rate_0 * a^N + p/i * (1 - a^N) | |
2595 | ||
2596 | When N is large, a^N -> 0 so rate_N -> p/i as desired. | |
2597 | ||
2598 | rate_N = p/i + (rate_0 - p/i) * a^N | |
2599 | a^N = (rate_N - p/i) / (rate_0 - p/i) | |
2600 | N * -i/p = log((rate_N - p/i) / (rate_0 - p/i)) | |
2601 | N = p/i * log((rate_0 - p/i) / (rate_N - p/i)) | |
2602 | ||
2603 | Numerical analysis of the above equation, setting the computed rate to | |
2604 | increase from rate_0 = 0 to rate_N = limit, shows that for large sending | |
2605 | rates, p/i, the number of messages N = limit. So limit serves as both the | |
2606 | maximum rate measured in messages per period, and the maximum number of | |
2607 | messages that can be sent in a fast burst. */ | |
2608 | ||
2609 | double this_time = (double)tv.tv_sec | |
2610 | + (double)tv.tv_usec / 1000000.0; | |
2611 | double prev_time = (double)dbd->time_stamp | |
2612 | + (double)dbd->time_usec / 1000000.0; | |
870f6ba8 TF |
2613 | |
2614 | /* We must avoid division by zero, and deal gracefully with the clock going | |
2615 | backwards. If we blunder ahead when time is in reverse then the computed | |
e5d5a95f | 2616 | rate will be bogus. To be safe we clamp interval to a very small number. */ |
870f6ba8 | 2617 | |
e5d5a95f TF |
2618 | double interval = this_time - prev_time <= 0.0 ? 1e-9 |
2619 | : this_time - prev_time; | |
2620 | ||
2621 | double i_over_p = interval / period; | |
2622 | double a = exp(-i_over_p); | |
870f6ba8 | 2623 | |
c99ce5c9 TF |
2624 | /* Combine the instantaneous rate (period / interval) with the previous rate |
2625 | using the smoothing factor a. In order to measure sized events, multiply the | |
2626 | instantaneous rate by the count of bytes or recipients etc. */ | |
2627 | ||
870f6ba8 TF |
2628 | dbd->time_stamp = tv.tv_sec; |
2629 | dbd->time_usec = tv.tv_usec; | |
c99ce5c9 TF |
2630 | dbd->rate = (1 - a) * count / i_over_p + a * dbd->rate; |
2631 | ||
2632 | /* When events are very widely spaced the computed rate tends towards zero. | |
2633 | Although this is accurate it turns out not to be useful for our purposes, | |
2634 | especially when the first event after a long silence is the start of a spam | |
2635 | run. A more useful model is that the rate for an isolated event should be the | |
2636 | size of the event per the period size, ignoring the lack of events outside | |
2637 | the current period and regardless of where the event falls in the period. So, | |
2638 | if the interval was so long that the calculated rate is unhelpfully small, we | |
2639 | re-intialize the rate. In the absence of higher-rate bursts, the condition | |
2640 | below is true if the interval is greater than the period. */ | |
2641 | ||
2642 | if (dbd->rate < count) dbd->rate = count; | |
870f6ba8 TF |
2643 | } |
2644 | ||
c99ce5c9 TF |
2645 | /* Clients sending at the limit are considered to be over the limit. |
2646 | This matters for edge cases such as a limit of zero, when the client | |
2647 | should be completely blocked. */ | |
3348576f | 2648 | |
8f240103 | 2649 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2650 | |
2651 | /* Update the state if the rate is low or if we are being strict. If we | |
2652 | are in leaky mode and the sender's rate is too high, we do not update | |
2653 | the recorded rate in order to avoid an over-aggressive sender's retry | |
c99ce5c9 TF |
2654 | rate preventing them from getting any email through. If readonly is set, |
2655 | neither leaky nor strict are set, so we do not do any updates. */ | |
870f6ba8 | 2656 | |
c99ce5c9 | 2657 | if ((rc == FAIL && leaky) || strict) |
8f240103 | 2658 | { |
c99ce5c9 | 2659 | dbfn_write(dbm, key, dbdb, dbdb_size); |
8f240103 PH |
2660 | HDEBUG(D_acl) debug_printf("ratelimit db updated\n"); |
2661 | } | |
2662 | else | |
2663 | { | |
2664 | HDEBUG(D_acl) debug_printf("ratelimit db not updated: %s\n", | |
c99ce5c9 | 2665 | readonly? "readonly mode" : "over the limit, but leaky"); |
8f240103 PH |
2666 | } |
2667 | ||
870f6ba8 TF |
2668 | dbfn_close(dbm); |
2669 | ||
c99ce5c9 | 2670 | /* Store the result in the tree for future reference. */ |
870f6ba8 | 2671 | |
c99ce5c9 TF |
2672 | t = store_get(sizeof(tree_node) + Ustrlen(key)); |
2673 | t->data.ptr = dbd; | |
2674 | Ustrcpy(t->name, key); | |
2675 | (void)tree_insertnode(anchor, t); | |
870f6ba8 TF |
2676 | |
2677 | /* We create the formatted version of the sender's rate very late in | |
2678 | order to ensure that it is done using the correct storage pool. */ | |
2679 | ||
2680 | store_pool = old_pool; | |
2681 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2682 | ||
2683 | HDEBUG(D_acl) | |
2684 | debug_printf("ratelimit computed rate %s\n", sender_rate); | |
2685 | ||
2686 | return rc; | |
2687 | } | |
2688 | ||
2689 | ||
2690 | ||
059ec3d9 PH |
2691 | /************************************************* |
2692 | * Handle conditions/modifiers on an ACL item * | |
2693 | *************************************************/ | |
2694 | ||
2695 | /* Called from acl_check() below. | |
2696 | ||
2697 | Arguments: | |
2698 | verb ACL verb | |
2699 | cb ACL condition block - if NULL, result is OK | |
2700 | where where called from | |
2701 | addr the address being checked for RCPT, or NULL | |
2702 | level the nesting level | |
2703 | epp pointer to pass back TRUE if "endpass" encountered | |
2704 | (applies only to "accept" and "discard") | |
2705 | user_msgptr user message pointer | |
2706 | log_msgptr log message pointer | |
2707 | basic_errno pointer to where to put verify error | |
2708 | ||
2709 | Returns: OK - all conditions are met | |
2710 | DISCARD - an "acl" condition returned DISCARD - only allowed | |
2711 | for "accept" or "discard" verbs | |
2712 | FAIL - at least one condition fails | |
2713 | FAIL_DROP - an "acl" condition returned FAIL_DROP | |
2714 | DEFER - can't tell at the moment (typically, lookup defer, | |
2715 | but can be temporary callout problem) | |
2716 | ERROR - ERROR from nested ACL or expansion failure or other | |
2717 | error | |
2718 | */ | |
2719 | ||
2720 | static int | |
2721 | acl_check_condition(int verb, acl_condition_block *cb, int where, | |
2722 | address_item *addr, int level, BOOL *epp, uschar **user_msgptr, | |
2723 | uschar **log_msgptr, int *basic_errno) | |
2724 | { | |
2725 | uschar *user_message = NULL; | |
2726 | uschar *log_message = NULL; | |
ed7f7860 PP |
2727 | uschar *debug_tag = NULL; |
2728 | uschar *debug_opts = NULL; | |
91ecef39 | 2729 | uschar *p = NULL; |
059ec3d9 | 2730 | int rc = OK; |
8523533c TK |
2731 | #ifdef WITH_CONTENT_SCAN |
2732 | int sep = '/'; | |
2733 | #endif | |
059ec3d9 PH |
2734 | |
2735 | for (; cb != NULL; cb = cb->next) | |
2736 | { | |
2737 | uschar *arg; | |
8e669ac1 | 2738 | int control_type; |
059ec3d9 PH |
2739 | |
2740 | /* The message and log_message items set up messages to be used in | |
2741 | case of rejection. They are expanded later. */ | |
2742 | ||
2743 | if (cb->type == ACLC_MESSAGE) | |
2744 | { | |
2745 | user_message = cb->arg; | |
2746 | continue; | |
2747 | } | |
2748 | ||
2749 | if (cb->type == ACLC_LOG_MESSAGE) | |
2750 | { | |
2751 | log_message = cb->arg; | |
2752 | continue; | |
2753 | } | |
2754 | ||
2755 | /* The endpass "condition" just sets a flag to show it occurred. This is | |
2756 | checked at compile time to be on an "accept" or "discard" item. */ | |
2757 | ||
2758 | if (cb->type == ACLC_ENDPASS) | |
2759 | { | |
2760 | *epp = TRUE; | |
2761 | continue; | |
2762 | } | |
2763 | ||
2764 | /* For other conditions and modifiers, the argument is expanded now for some | |
2765 | of them, but not for all, because expansion happens down in some lower level | |
2766 | checking functions in some cases. */ | |
2767 | ||
2768 | if (cond_expand_at_top[cb->type]) | |
2769 | { | |
2770 | arg = expand_string(cb->arg); | |
2771 | if (arg == NULL) | |
2772 | { | |
2773 | if (expand_string_forcedfail) continue; | |
2774 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
2775 | cb->arg, expand_string_message); | |
2776 | return search_find_defer? DEFER : ERROR; | |
2777 | } | |
2778 | } | |
2779 | else arg = cb->arg; | |
2780 | ||
2781 | /* Show condition, and expanded condition if it's different */ | |
2782 | ||
2783 | HDEBUG(D_acl) | |
2784 | { | |
2785 | int lhswidth = 0; | |
2786 | debug_printf("check %s%s %n", | |
2787 | (!cond_modifiers[cb->type] && cb->u.negated)? "!":"", | |
2788 | conditions[cb->type], &lhswidth); | |
2789 | ||
2790 | if (cb->type == ACLC_SET) | |
2791 | { | |
38a0a95f PH |
2792 | debug_printf("acl_%s ", cb->u.varname); |
2793 | lhswidth += 5 + Ustrlen(cb->u.varname); | |
059ec3d9 PH |
2794 | } |
2795 | ||
2796 | debug_printf("= %s\n", cb->arg); | |
2797 | ||
2798 | if (arg != cb->arg) | |
2799 | debug_printf("%.*s= %s\n", lhswidth, | |
2800 | US" ", CS arg); | |
2801 | } | |
2802 | ||
2803 | /* Check that this condition makes sense at this time */ | |
2804 | ||
2805 | if ((cond_forbids[cb->type] & (1 << where)) != 0) | |
2806 | { | |
2807 | *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL", | |
2808 | cond_modifiers[cb->type]? "use" : "test", | |
2809 | conditions[cb->type], acl_wherenames[where]); | |
2810 | return ERROR; | |
2811 | } | |
2812 | ||
2813 | /* Run the appropriate test for each condition, or take the appropriate | |
2814 | action for the remaining modifiers. */ | |
2815 | ||
2816 | switch(cb->type) | |
2817 | { | |
71fafd95 PH |
2818 | case ACLC_ADD_HEADER: |
2819 | setup_header(arg); | |
2820 | break; | |
2821 | ||
059ec3d9 PH |
2822 | /* A nested ACL that returns "discard" makes sense only for an "accept" or |
2823 | "discard" verb. */ | |
71fafd95 | 2824 | |
059ec3d9 | 2825 | case ACLC_ACL: |
f60d98e8 | 2826 | rc = acl_check_wargs(where, addr, arg, level+1, user_msgptr, log_msgptr); |
7421ecab JH |
2827 | if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD) |
2828 | { | |
2829 | *log_msgptr = string_sprintf("nested ACL returned \"discard\" for " | |
2830 | "\"%s\" command (only allowed with \"accept\" or \"discard\")", | |
2831 | verbs[verb]); | |
2832 | return ERROR; | |
2833 | } | |
059ec3d9 PH |
2834 | break; |
2835 | ||
2836 | case ACLC_AUTHENTICATED: | |
2837 | rc = (sender_host_authenticated == NULL)? FAIL : | |
2838 | match_isinlist(sender_host_authenticated, &arg, 0, NULL, NULL, MCL_STRING, | |
2839 | TRUE, NULL); | |
2840 | break; | |
2841 | ||
71fafd95 | 2842 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
8523533c TK |
2843 | case ACLC_BMI_OPTIN: |
2844 | { | |
2845 | int old_pool = store_pool; | |
2846 | store_pool = POOL_PERM; | |
2847 | bmi_current_optin = string_copy(arg); | |
2848 | store_pool = old_pool; | |
2849 | } | |
2850 | break; | |
71fafd95 | 2851 | #endif |
8523533c | 2852 | |
059ec3d9 | 2853 | case ACLC_CONDITION: |
f3766eb5 NM |
2854 | /* The true/false parsing here should be kept in sync with that used in |
2855 | expand.c when dealing with ECOND_BOOL so that we don't have too many | |
2856 | different definitions of what can be a boolean. */ | |
059ec3d9 PH |
2857 | if (Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */ |
2858 | rc = (Uatoi(arg) == 0)? FAIL : OK; | |
2859 | else | |
2860 | rc = (strcmpic(arg, US"no") == 0 || | |
2861 | strcmpic(arg, US"false") == 0)? FAIL : | |
2862 | (strcmpic(arg, US"yes") == 0 || | |
2863 | strcmpic(arg, US"true") == 0)? OK : DEFER; | |
2864 | if (rc == DEFER) | |
2865 | *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg); | |
2866 | break; | |
2867 | ||
c3611384 PH |
2868 | case ACLC_CONTINUE: /* Always succeeds */ |
2869 | break; | |
2870 | ||
059ec3d9 | 2871 | case ACLC_CONTROL: |
c5fcb476 PH |
2872 | control_type = decode_control(arg, &p, where, log_msgptr); |
2873 | ||
8523533c | 2874 | /* Check if this control makes sense at this time */ |
c5fcb476 PH |
2875 | |
2876 | if ((control_forbids[control_type] & (1 << where)) != 0) | |
2877 | { | |
2878 | *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL", | |
2879 | controls[control_type], acl_wherenames[where]); | |
2880 | return ERROR; | |
8e669ac1 | 2881 | } |
c5fcb476 PH |
2882 | |
2883 | switch(control_type) | |
059ec3d9 | 2884 | { |
c46782ef PH |
2885 | case CONTROL_AUTH_UNADVERTISED: |
2886 | allow_auth_unadvertised = TRUE; | |
2887 | break; | |
2888 | ||
2889 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
8523533c TK |
2890 | case CONTROL_BMI_RUN: |
2891 | bmi_run = 1; | |
2892 | break; | |
c46782ef PH |
2893 | #endif |
2894 | ||
80a47a2c | 2895 | #ifndef DISABLE_DKIM |
f7572e5a | 2896 | case CONTROL_DKIM_VERIFY: |
80a47a2c | 2897 | dkim_disable_verify = TRUE; |
f7572e5a TK |
2898 | break; |
2899 | #endif | |
2900 | ||
13363eba PP |
2901 | case CONTROL_DSCP: |
2902 | if (*p == '/') | |
2903 | { | |
2904 | int fd, af, level, optname, value; | |
2905 | /* If we are acting on stdin, the setsockopt may fail if stdin is not | |
2906 | a socket; we can accept that, we'll just debug-log failures anyway. */ | |
2907 | fd = fileno(smtp_in); | |
2908 | af = ip_get_address_family(fd); | |
2909 | if (af < 0) | |
2910 | { | |
2911 | HDEBUG(D_acl) | |
2912 | debug_printf("smtp input is probably not a socket [%s], not setting DSCP\n", | |
2913 | strerror(errno)); | |
2914 | break; | |
2915 | } | |
2916 | if (dscp_lookup(p+1, af, &level, &optname, &value)) | |
2917 | { | |
2918 | if (setsockopt(fd, level, optname, &value, sizeof(value)) < 0) | |
2919 | { | |
2920 | HDEBUG(D_acl) debug_printf("failed to set input DSCP[%s]: %s\n", | |
2921 | p+1, strerror(errno)); | |
2922 | } | |
2923 | else | |
2924 | { | |
2925 | HDEBUG(D_acl) debug_printf("set input DSCP to \"%s\"\n", p+1); | |
2926 | } | |
2927 | } | |
2928 | else | |
2929 | { | |
2930 | *log_msgptr = string_sprintf("unrecognised DSCP value in \"control=%s\"", arg); | |
2931 | return ERROR; | |
2932 | } | |
2933 | } | |
2934 | else | |
2935 | { | |
2936 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2937 | return ERROR; | |
2938 | } | |
2939 | break; | |
2940 | ||
059ec3d9 PH |
2941 | case CONTROL_ERROR: |
2942 | return ERROR; | |
2943 | ||
2944 | case CONTROL_CASEFUL_LOCAL_PART: | |
2945 | deliver_localpart = addr->cc_local_part; | |
2946 | break; | |
2947 | ||
2948 | case CONTROL_CASELOWER_LOCAL_PART: | |
2949 | deliver_localpart = addr->lc_local_part; | |
2950 | break; | |
2951 | ||
2952 | case CONTROL_ENFORCE_SYNC: | |
2953 | smtp_enforce_sync = TRUE; | |
2954 | break; | |
2955 | ||
2956 | case CONTROL_NO_ENFORCE_SYNC: | |
2957 | smtp_enforce_sync = FALSE; | |
2958 | break; | |
2959 | ||
c46782ef | 2960 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
2961 | case CONTROL_NO_MBOX_UNSPOOL: |
2962 | no_mbox_unspool = TRUE; | |
2963 | break; | |
c46782ef | 2964 | #endif |
8523533c | 2965 | |
059ec3d9 PH |
2966 | case CONTROL_NO_MULTILINE: |
2967 | no_multiline_responses = TRUE; | |
2968 | break; | |
2969 | ||
cf8b11a5 PH |
2970 | case CONTROL_NO_PIPELINING: |
2971 | pipelining_enable = FALSE; | |
2972 | break; | |
2973 | ||
047bdd8c PH |
2974 | case CONTROL_NO_DELAY_FLUSH: |
2975 | disable_delay_flush = TRUE; | |
2976 | break; | |
2977 | ||
4c590bd1 PH |
2978 | case CONTROL_NO_CALLOUT_FLUSH: |
2979 | disable_callout_flush = TRUE; | |
2980 | break; | |
2981 | ||
29aba418 | 2982 | case CONTROL_FAKEDEFER: |
8523533c | 2983 | case CONTROL_FAKEREJECT: |
29aba418 | 2984 | fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL; |
8523533c | 2985 | if (*p == '/') |
8e669ac1 | 2986 | { |
8523533c | 2987 | uschar *pp = p + 1; |
8e669ac1 | 2988 | while (*pp != 0) pp++; |
29aba418 | 2989 | fake_response_text = expand_string(string_copyn(p+1, pp-p-1)); |
8523533c TK |
2990 | p = pp; |
2991 | } | |
2992 | else | |
2993 | { | |
2994 | /* Explicitly reset to default string */ | |
29aba418 | 2995 | fake_response_text = US"Your message has been rejected but is being kept for evaluation.\nIf it was a legitimate message, it may still be delivered to the target recipient(s)."; |
8523533c TK |
2996 | } |
2997 | break; | |
8523533c | 2998 | |
059ec3d9 PH |
2999 | case CONTROL_FREEZE: |
3000 | deliver_freeze = TRUE; | |
3001 | deliver_frozen_at = time(NULL); | |
6a3f1455 PH |
3002 | freeze_tell = freeze_tell_config; /* Reset to configured value */ |
3003 | if (Ustrncmp(p, "/no_tell", 8) == 0) | |
3004 | { | |
3005 | p += 8; | |
3006 | freeze_tell = NULL; | |
3007 | } | |
3008 | if (*p != 0) | |
3009 | { | |
3010 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3011 | return ERROR; | |
3012 | } | |
059ec3d9 PH |
3013 | break; |
3014 | ||
3015 | case CONTROL_QUEUE_ONLY: | |
3016 | queue_only_policy = TRUE; | |
3017 | break; | |
3018 | ||
3019 | case CONTROL_SUBMISSION: | |
87ba3f5f | 3020 | originator_name = US""; |
059ec3d9 | 3021 | submission_mode = TRUE; |
69358f02 | 3022 | while (*p == '/') |
8e669ac1 | 3023 | { |
69358f02 PH |
3024 | if (Ustrncmp(p, "/sender_retain", 14) == 0) |
3025 | { | |
3026 | p += 14; | |
3027 | active_local_sender_retain = TRUE; | |
8e669ac1 PH |
3028 | active_local_from_check = FALSE; |
3029 | } | |
69358f02 PH |
3030 | else if (Ustrncmp(p, "/domain=", 8) == 0) |
3031 | { | |
3032 | uschar *pp = p + 8; | |
8e669ac1 | 3033 | while (*pp != 0 && *pp != '/') pp++; |
87ba3f5f PH |
3034 | submission_domain = string_copyn(p+8, pp-p-8); |
3035 | p = pp; | |
3036 | } | |
8857ccfd PH |
3037 | /* The name= option must be last, because it swallows the rest of |
3038 | the string. */ | |
87ba3f5f PH |
3039 | else if (Ustrncmp(p, "/name=", 6) == 0) |
3040 | { | |
3041 | uschar *pp = p + 6; | |
8857ccfd | 3042 | while (*pp != 0) pp++; |
2fe1a124 | 3043 | submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6, |
87ba3f5f | 3044 | big_buffer, big_buffer_size)); |
8e669ac1 | 3045 | p = pp; |
69358f02 | 3046 | } |
8e669ac1 PH |
3047 | else break; |
3048 | } | |
69358f02 | 3049 | if (*p != 0) |
059ec3d9 | 3050 | { |
69358f02 | 3051 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); |
059ec3d9 PH |
3052 | return ERROR; |
3053 | } | |
3054 | break; | |
8800895a | 3055 | |
ed7f7860 PP |
3056 | case CONTROL_DEBUG: |
3057 | while (*p == '/') | |
3058 | { | |
3059 | if (Ustrncmp(p, "/tag=", 5) == 0) | |
3060 | { | |
3061 | uschar *pp = p + 5; | |
3062 | while (*pp != '\0' && *pp != '/') pp++; | |
3063 | debug_tag = string_copyn(p+5, pp-p-5); | |
3064 | p = pp; | |
3065 | } | |
3066 | else if (Ustrncmp(p, "/opts=", 6) == 0) | |
3067 | { | |
3068 | uschar *pp = p + 6; | |
3069 | while (*pp != '\0' && *pp != '/') pp++; | |
3070 | debug_opts = string_copyn(p+6, pp-p-6); | |
3071 | p = pp; | |
3072 | } | |
3073 | } | |
3074 | debug_logging_activate(debug_tag, debug_opts); | |
3075 | break; | |
3076 | ||
8800895a PH |
3077 | case CONTROL_SUPPRESS_LOCAL_FIXUPS: |
3078 | suppress_local_fixups = TRUE; | |
3079 | break; | |
e4bdf652 JH |
3080 | |
3081 | case CONTROL_CUTTHROUGH_DELIVERY: | |
3082 | if (deliver_freeze) | |
3083 | { | |
3084 | *log_msgptr = string_sprintf("\"control=%s\" on frozen item", arg); | |
3085 | return ERROR; | |
3086 | } | |
3087 | if (queue_only_policy) | |
3088 | { | |
3089 | *log_msgptr = string_sprintf("\"control=%s\" on queue-only item", arg); | |
3090 | return ERROR; | |
3091 | } | |
3092 | cutthrough_delivery = TRUE; | |
3093 | break; | |
059ec3d9 PH |
3094 | } |
3095 | break; | |
3096 | ||
6a8f9482 TK |
3097 | #ifdef EXPERIMENTAL_DCC |
3098 | case ACLC_DCC: | |
3099 | { | |
3100 | /* Seperate the regular expression and any optional parameters. */ | |
3101 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); | |
3102 | /* Run the dcc backend. */ | |
3103 | rc = dcc_process(&ss); | |
3104 | /* Modify return code based upon the existance of options. */ | |
3105 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
3106 | != NULL) { | |
3107 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
3108 | { | |
3109 | /* FAIL so that the message is passed to the next ACL */ | |
3110 | rc = FAIL; | |
3111 | } | |
3112 | } | |
3113 | } | |
3114 | break; | |
3115 | #endif | |
3116 | ||
71fafd95 | 3117 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3118 | case ACLC_DECODE: |
3119 | rc = mime_decode(&arg); | |
3120 | break; | |
71fafd95 | 3121 | #endif |
8523533c | 3122 | |
059ec3d9 PH |
3123 | case ACLC_DELAY: |
3124 | { | |
3125 | int delay = readconf_readtime(arg, 0, FALSE); | |
3126 | if (delay < 0) | |
3127 | { | |
3128 | *log_msgptr = string_sprintf("syntax error in argument for \"delay\" " | |
3129 | "modifier: \"%s\" is not a time value", arg); | |
3130 | return ERROR; | |
3131 | } | |
3132 | else | |
3133 | { | |
3134 | HDEBUG(D_acl) debug_printf("delay modifier requests %d-second delay\n", | |
3135 | delay); | |
3136 | if (host_checking) | |
3137 | { | |
3138 | HDEBUG(D_acl) | |
3139 | debug_printf("delay skipped in -bh checking mode\n"); | |
3140 | } | |
010c2d14 PH |
3141 | |
3142 | /* It appears to be impossible to detect that a TCP/IP connection has | |
3143 | gone away without reading from it. This means that we cannot shorten | |
3144 | the delay below if the client goes away, because we cannot discover | |
3145 | that the client has closed its end of the connection. (The connection | |
3146 | is actually in a half-closed state, waiting for the server to close its | |
3147 | end.) It would be nice to be able to detect this state, so that the | |
3148 | Exim process is not held up unnecessarily. However, it seems that we | |
3149 | can't. The poll() function does not do the right thing, and in any case | |
3150 | it is not always available. | |
3151 | ||
047bdd8c | 3152 | NOTE 1: If ever this state of affairs changes, remember that we may be |
010c2d14 | 3153 | dealing with stdin/stdout here, in addition to TCP/IP connections. |
047bdd8c PH |
3154 | Also, delays may be specified for non-SMTP input, where smtp_out and |
3155 | smtp_in will be NULL. Whatever is done must work in all cases. | |
3156 | ||
3157 | NOTE 2: The added feature of flushing the output before a delay must | |
3158 | apply only to SMTP input. Hence the test for smtp_out being non-NULL. | |
3159 | */ | |
010c2d14 | 3160 | |
8e669ac1 | 3161 | else |
86b8287f | 3162 | { |
14f4a80d | 3163 | if (smtp_out != NULL && !disable_delay_flush) mac_smtp_fflush(); |
86b8287f | 3164 | while (delay > 0) delay = sleep(delay); |
8e669ac1 | 3165 | } |
059ec3d9 PH |
3166 | } |
3167 | } | |
3168 | break; | |
3169 | ||
71fafd95 | 3170 | #ifdef WITH_OLD_DEMIME |
8523533c TK |
3171 | case ACLC_DEMIME: |
3172 | rc = demime(&arg); | |
3173 | break; | |
71fafd95 | 3174 | #endif |
8523533c | 3175 | |
80a47a2c TK |
3176 | #ifndef DISABLE_DKIM |
3177 | case ACLC_DKIM_SIGNER: | |
9e5d6b55 TK |
3178 | if (dkim_cur_signer != NULL) |
3179 | rc = match_isinlist(dkim_cur_signer, | |
80a47a2c | 3180 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); |
80a47a2c | 3181 | else |
80a47a2c | 3182 | rc = FAIL; |
71fafd95 PH |
3183 | break; |
3184 | ||
80a47a2c TK |
3185 | case ACLC_DKIM_STATUS: |
3186 | rc = match_isinlist(dkim_exim_expand_query(DKIM_VERIFY_STATUS), | |
3187 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); | |
71fafd95 PH |
3188 | break; |
3189 | #endif | |
fb2274d4 | 3190 | |
059ec3d9 PH |
3191 | case ACLC_DNSLISTS: |
3192 | rc = verify_check_dnsbl(&arg); | |
3193 | break; | |
3194 | ||
3195 | case ACLC_DOMAINS: | |
3196 | rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor, | |
3197 | addr->domain_cache, MCL_DOMAIN, TRUE, &deliver_domain_data); | |
3198 | break; | |
3199 | ||
3200 | /* The value in tls_cipher is the full cipher name, for example, | |
3201 | TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the | |
3202 | cipher names such as DES-CBC3-SHA. But program defensively. We don't know | |
3203 | what may in practice come out of the SSL library - which at the time of | |
3204 | writing is poorly documented. */ | |
3205 | ||
3206 | case ACLC_ENCRYPTED: | |
817d9f57 | 3207 | if (tls_in.cipher == NULL) rc = FAIL; else |
059ec3d9 PH |
3208 | { |
3209 | uschar *endcipher = NULL; | |
817d9f57 JH |
3210 | uschar *cipher = Ustrchr(tls_in.cipher, ':'); |
3211 | if (cipher == NULL) cipher = tls_in.cipher; else | |
059ec3d9 PH |
3212 | { |
3213 | endcipher = Ustrchr(++cipher, ':'); | |
3214 | if (endcipher != NULL) *endcipher = 0; | |
3215 | } | |
3216 | rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL); | |
3217 | if (endcipher != NULL) *endcipher = ':'; | |
3218 | } | |
3219 | break; | |
3220 | ||
3221 | /* Use verify_check_this_host() instead of verify_check_host() so that | |
3222 | we can pass over &host_data to catch any looked up data. Once it has been | |
3223 | set, it retains its value so that it's still there if another ACL verb | |
3224 | comes through here and uses the cache. However, we must put it into | |
3225 | permanent store in case it is also expected to be used in a subsequent | |
3226 | message in the same SMTP connection. */ | |
3227 | ||
3228 | case ACLC_HOSTS: | |
3229 | rc = verify_check_this_host(&arg, sender_host_cache, NULL, | |
3230 | (sender_host_address == NULL)? US"" : sender_host_address, &host_data); | |
3231 | if (host_data != NULL) host_data = string_copy_malloc(host_data); | |
3232 | break; | |
3233 | ||
3234 | case ACLC_LOCAL_PARTS: | |
3235 | rc = match_isinlist(addr->cc_local_part, &arg, 0, | |
3236 | &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE, | |
3237 | &deliver_localpart_data); | |
3238 | break; | |
3239 | ||
6ea85e9a PH |
3240 | case ACLC_LOG_REJECT_TARGET: |
3241 | { | |
3242 | int logbits = 0; | |
3243 | int sep = 0; | |
3244 | uschar *s = arg; | |
3245 | uschar *ss; | |
3246 | while ((ss = string_nextinlist(&s, &sep, big_buffer, big_buffer_size)) | |
3247 | != NULL) | |
3248 | { | |
3249 | if (Ustrcmp(ss, "main") == 0) logbits |= LOG_MAIN; | |
3250 | else if (Ustrcmp(ss, "panic") == 0) logbits |= LOG_PANIC; | |
3251 | else if (Ustrcmp(ss, "reject") == 0) logbits |= LOG_REJECT; | |
3252 | else | |
3253 | { | |
3254 | logbits |= LOG_MAIN|LOG_REJECT; | |
3255 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown log name \"%s\" in " | |
3256 | "\"log_reject_target\" in %s ACL", ss, acl_wherenames[where]); | |
3257 | } | |
3258 | } | |
3259 | log_reject_target = logbits; | |
3260 | } | |
3261 | break; | |
3262 | ||
059ec3d9 PH |
3263 | case ACLC_LOGWRITE: |
3264 | { | |
3265 | int logbits = 0; | |
3266 | uschar *s = arg; | |
3267 | if (*s == ':') | |
3268 | { | |
3269 | s++; | |
3270 | while (*s != ':') | |
3271 | { | |
3272 | if (Ustrncmp(s, "main", 4) == 0) | |
3273 | { logbits |= LOG_MAIN; s += 4; } | |
3274 | else if (Ustrncmp(s, "panic", 5) == 0) | |
3275 | { logbits |= LOG_PANIC; s += 5; } | |
3276 | else if (Ustrncmp(s, "reject", 6) == 0) | |
3277 | { logbits |= LOG_REJECT; s += 6; } | |
3278 | else | |
3279 | { | |
3280 | logbits = LOG_MAIN|LOG_PANIC; | |
3281 | s = string_sprintf(":unknown log name in \"%s\" in " | |
3282 | "\"logwrite\" in %s ACL", arg, acl_wherenames[where]); | |
3283 | } | |
3284 | if (*s == ',') s++; | |
3285 | } | |
3286 | s++; | |
3287 | } | |
3288 | while (isspace(*s)) s++; | |
6ea85e9a PH |
3289 | |
3290 | ||
059ec3d9 PH |
3291 | if (logbits == 0) logbits = LOG_MAIN; |
3292 | log_write(0, logbits, "%s", string_printing(s)); | |
3293 | } | |
3294 | break; | |
8e669ac1 | 3295 | |
71fafd95 | 3296 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3297 | case ACLC_MALWARE: |
3298 | { | |
6ea85e9a | 3299 | /* Separate the regular expression and any optional parameters. */ |
8523533c TK |
3300 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); |
3301 | /* Run the malware backend. */ | |
3302 | rc = malware(&ss); | |
3303 | /* Modify return code based upon the existance of options. */ | |
3304 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
3305 | != NULL) { | |
3306 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
3307 | { | |
3308 | /* FAIL so that the message is passed to the next ACL */ | |
3309 | rc = FAIL; | |
3310 | } | |
3311 | } | |
3312 | } | |
3313 | break; | |
3314 | ||
3315 | case ACLC_MIME_REGEX: | |
71fafd95 | 3316 | rc = mime_regex(&arg); |
8523533c | 3317 | break; |
71fafd95 | 3318 | #endif |
059ec3d9 | 3319 | |
870f6ba8 | 3320 | case ACLC_RATELIMIT: |
90fc3069 | 3321 | rc = acl_ratelimit(arg, where, log_msgptr); |
870f6ba8 TF |
3322 | break; |
3323 | ||
059ec3d9 PH |
3324 | case ACLC_RECIPIENTS: |
3325 | rc = match_address_list(addr->address, TRUE, TRUE, &arg, NULL, -1, 0, | |
3326 | &recipient_data); | |
3327 | break; | |
3328 | ||
71fafd95 PH |
3329 | #ifdef WITH_CONTENT_SCAN |
3330 | case ACLC_REGEX: | |
3331 | rc = regex(&arg); | |
8523533c | 3332 | break; |
71fafd95 | 3333 | #endif |
8523533c | 3334 | |
e7568d51 TL |
3335 | case ACLC_REMOVE_HEADER: |
3336 | setup_remove_header(arg); | |
3337 | break; | |
3338 | ||
059ec3d9 PH |
3339 | case ACLC_SENDER_DOMAINS: |
3340 | { | |
3341 | uschar *sdomain; | |
3342 | sdomain = Ustrrchr(sender_address, '@'); | |
3343 | sdomain = (sdomain == NULL)? US"" : sdomain + 1; | |
3344 | rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor, | |
3345 | sender_domain_cache, MCL_DOMAIN, TRUE, NULL); | |
3346 | } | |
3347 | break; | |
3348 | ||
3349 | case ACLC_SENDERS: | |
3350 | rc = match_address_list(sender_address, TRUE, TRUE, &arg, | |
3351 | sender_address_cache, -1, 0, &sender_data); | |
3352 | break; | |
3353 | ||
3354 | /* Connection variables must persist forever */ | |
3355 | ||
3356 | case ACLC_SET: | |
3357 | { | |
3358 | int old_pool = store_pool; | |
38a0a95f PH |
3359 | if (cb->u.varname[0] == 'c') store_pool = POOL_PERM; |
3360 | acl_var_create(cb->u.varname)->data.ptr = string_copy(arg); | |
059ec3d9 PH |
3361 | store_pool = old_pool; |
3362 | } | |
3363 | break; | |
3364 | ||
71fafd95 | 3365 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3366 | case ACLC_SPAM: |
3367 | { | |
3368 | /* Seperate the regular expression and any optional parameters. */ | |
3369 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); | |
3370 | /* Run the spam backend. */ | |
3371 | rc = spam(&ss); | |
3372 | /* Modify return code based upon the existance of options. */ | |
3373 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
3374 | != NULL) { | |
3375 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
3376 | { | |
3377 | /* FAIL so that the message is passed to the next ACL */ | |
3378 | rc = FAIL; | |
3379 | } | |
3380 | } | |
3381 | } | |
3382 | break; | |
71fafd95 | 3383 | #endif |
8523533c | 3384 | |
71fafd95 | 3385 | #ifdef EXPERIMENTAL_SPF |
8523533c | 3386 | case ACLC_SPF: |
65a7d8c3 NM |
3387 | rc = spf_process(&arg, sender_address, SPF_PROCESS_NORMAL); |
3388 | break; | |
3389 | case ACLC_SPF_GUESS: | |
3390 | rc = spf_process(&arg, sender_address, SPF_PROCESS_GUESS); | |
8523533c | 3391 | break; |
71fafd95 | 3392 | #endif |
8523533c | 3393 | |
059ec3d9 PH |
3394 | /* If the verb is WARN, discard any user message from verification, because |
3395 | such messages are SMTP responses, not header additions. The latter come | |
475fe28a PH |
3396 | only from explicit "message" modifiers. However, put the user message into |
3397 | $acl_verify_message so it can be used in subsequent conditions or modifiers | |
3398 | (until something changes it). */ | |
059ec3d9 PH |
3399 | |
3400 | case ACLC_VERIFY: | |
3401 | rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno); | |
475fe28a | 3402 | acl_verify_message = *user_msgptr; |
059ec3d9 PH |
3403 | if (verb == ACL_WARN) *user_msgptr = NULL; |
3404 | break; | |
3405 | ||
3406 | default: | |
3407 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown " | |
3408 | "condition %d", cb->type); | |
3409 | break; | |
3410 | } | |
3411 | ||
3412 | /* If a condition was negated, invert OK/FAIL. */ | |
3413 | ||
3414 | if (!cond_modifiers[cb->type] && cb->u.negated) | |
3415 | { | |
3416 | if (rc == OK) rc = FAIL; | |
3417 | else if (rc == FAIL || rc == FAIL_DROP) rc = OK; | |
3418 | } | |
3419 | ||
3420 | if (rc != OK) break; /* Conditions loop */ | |
3421 | } | |
3422 | ||
3423 | ||
3424 | /* If the result is the one for which "message" and/or "log_message" are used, | |
4e88a19f PH |
3425 | handle the values of these modifiers. If there isn't a log message set, we make |
3426 | it the same as the user message. | |
059ec3d9 PH |
3427 | |
3428 | "message" is a user message that will be included in an SMTP response. Unless | |
3429 | it is empty, it overrides any previously set user message. | |
3430 | ||
3431 | "log_message" is a non-user message, and it adds to any existing non-user | |
3432 | message that is already set. | |
3433 | ||
4e88a19f PH |
3434 | Most verbs have but a single return for which the messages are relevant, but |
3435 | for "discard", it's useful to have the log message both when it succeeds and | |
3436 | when it fails. For "accept", the message is used in the OK case if there is no | |
3437 | "endpass", but (for backwards compatibility) in the FAIL case if "endpass" is | |
3438 | present. */ | |
059ec3d9 | 3439 | |
4e88a19f PH |
3440 | if (*epp && rc == OK) user_message = NULL; |
3441 | ||
3442 | if (((1<<rc) & msgcond[verb]) != 0) | |
059ec3d9 PH |
3443 | { |
3444 | uschar *expmessage; | |
4e88a19f PH |
3445 | uschar *old_user_msgptr = *user_msgptr; |
3446 | uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr; | |
059ec3d9 PH |
3447 | |
3448 | /* If the verb is "warn", messages generated by conditions (verification or | |
4e88a19f PH |
3449 | nested ACLs) are always discarded. This also happens for acceptance verbs |
3450 | when they actually do accept. Only messages specified at this level are used. | |
059ec3d9 PH |
3451 | However, the value of an existing message is available in $acl_verify_message |
3452 | during expansions. */ | |
3453 | ||
4e88a19f PH |
3454 | if (verb == ACL_WARN || |
3455 | (rc == OK && (verb == ACL_ACCEPT || verb == ACL_DISCARD))) | |
3456 | *log_msgptr = *user_msgptr = NULL; | |
059ec3d9 PH |
3457 | |
3458 | if (user_message != NULL) | |
3459 | { | |
3460 | acl_verify_message = old_user_msgptr; | |
3461 | expmessage = expand_string(user_message); | |
3462 | if (expmessage == NULL) | |
3463 | { | |
3464 | if (!expand_string_forcedfail) | |
3465 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3466 | user_message, expand_string_message); | |
3467 | } | |
3468 | else if (expmessage[0] != 0) *user_msgptr = expmessage; | |
3469 | } | |
3470 | ||
3471 | if (log_message != NULL) | |
3472 | { | |
3473 | acl_verify_message = old_log_msgptr; | |
3474 | expmessage = expand_string(log_message); | |
3475 | if (expmessage == NULL) | |
3476 | { | |
3477 | if (!expand_string_forcedfail) | |
3478 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3479 | log_message, expand_string_message); | |
3480 | } | |
3481 | else if (expmessage[0] != 0) | |
3482 | { | |
3483 | *log_msgptr = (*log_msgptr == NULL)? expmessage : | |
3484 | string_sprintf("%s: %s", expmessage, *log_msgptr); | |
3485 | } | |
3486 | } | |
3487 | ||
3488 | /* If no log message, default it to the user message */ | |
3489 | ||
3490 | if (*log_msgptr == NULL) *log_msgptr = *user_msgptr; | |
3491 | } | |
3492 | ||
3493 | acl_verify_message = NULL; | |
3494 | return rc; | |
3495 | } | |
3496 | ||
3497 | ||
3498 | ||
3499 | ||
3500 | ||
3501 | /************************************************* | |
3502 | * Get line from a literal ACL * | |
3503 | *************************************************/ | |
3504 | ||
3505 | /* This function is passed to acl_read() in order to extract individual lines | |
3506 | of a literal ACL, which we access via static pointers. We can destroy the | |
3507 | contents because this is called only once (the compiled ACL is remembered). | |
3508 | ||
3509 | This code is intended to treat the data in the same way as lines in the main | |
3510 | Exim configuration file. That is: | |
3511 | ||
3512 | . Leading spaces are ignored. | |
3513 | ||
3514 | . A \ at the end of a line is a continuation - trailing spaces after the \ | |
3515 | are permitted (this is because I don't believe in making invisible things | |
3516 | significant). Leading spaces on the continued part of a line are ignored. | |
3517 | ||
3518 | . Physical lines starting (significantly) with # are totally ignored, and | |
3519 | may appear within a sequence of backslash-continued lines. | |
3520 | ||
3521 | . Blank lines are ignored, but will end a sequence of continuations. | |
3522 | ||
3523 | Arguments: none | |
3524 | Returns: a pointer to the next line | |
3525 | */ | |
3526 | ||
3527 | ||
3528 | static uschar *acl_text; /* Current pointer in the text */ | |
3529 | static uschar *acl_text_end; /* Points one past the terminating '0' */ | |
3530 | ||
3531 | ||
3532 | static uschar * | |
3533 | acl_getline(void) | |
3534 | { | |
3535 | uschar *yield; | |
3536 | ||
3537 | /* This loop handles leading blank lines and comments. */ | |
3538 | ||
3539 | for(;;) | |
3540 | { | |
3541 | while (isspace(*acl_text)) acl_text++; /* Leading spaces/empty lines */ | |
3542 | if (*acl_text == 0) return NULL; /* No more data */ | |
3543 | yield = acl_text; /* Potential data line */ | |
3544 | ||
3545 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3546 | ||
3547 | /* If we hit the end before a newline, we have the whole logical line. If | |
3548 | it's a comment, there's no more data to be given. Otherwise, yield it. */ | |
3549 | ||
3550 | if (*acl_text == 0) return (*yield == '#')? NULL : yield; | |
3551 | ||
3552 | /* After reaching a newline, end this loop if the physical line does not | |
3553 | start with '#'. If it does, it's a comment, and the loop continues. */ | |
3554 | ||
3555 | if (*yield != '#') break; | |
3556 | } | |
3557 | ||
3558 | /* This loop handles continuations. We know we have some real data, ending in | |
3559 | newline. See if there is a continuation marker at the end (ignoring trailing | |
3560 | white space). We know that *yield is not white space, so no need to test for | |
3561 | cont > yield in the backwards scanning loop. */ | |
3562 | ||
3563 | for(;;) | |
3564 | { | |
3565 | uschar *cont; | |
3566 | for (cont = acl_text - 1; isspace(*cont); cont--); | |
3567 | ||
3568 | /* If no continuation follows, we are done. Mark the end of the line and | |
3569 | return it. */ | |
3570 | ||
3571 | if (*cont != '\\') | |
3572 | { | |
3573 | *acl_text++ = 0; | |
3574 | return yield; | |
3575 | } | |
3576 | ||
3577 | /* We have encountered a continuation. Skip over whitespace at the start of | |
3578 | the next line, and indeed the whole of the next line or lines if they are | |
3579 | comment lines. */ | |
3580 | ||
3581 | for (;;) | |
3582 | { | |
3583 | while (*(++acl_text) == ' ' || *acl_text == '\t'); | |
3584 | if (*acl_text != '#') break; | |
3585 | while (*(++acl_text) != 0 && *acl_text != '\n'); | |
3586 | } | |
3587 | ||
3588 | /* We have the start of a continuation line. Move all the rest of the data | |
3589 | to join onto the previous line, and then find its end. If the end is not a | |
3590 | newline, we are done. Otherwise loop to look for another continuation. */ | |
3591 | ||
3592 | memmove(cont, acl_text, acl_text_end - acl_text); | |
3593 | acl_text_end -= acl_text - cont; | |
3594 | acl_text = cont; | |
3595 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3596 | if (*acl_text == 0) return yield; | |
3597 | } | |
3598 | ||
3599 | /* Control does not reach here */ | |
3600 | } | |
3601 | ||
3602 | ||
3603 | ||
3604 | ||
3605 | ||
3606 | /************************************************* | |
3607 | * Check access using an ACL * | |
3608 | *************************************************/ | |
3609 | ||
3610 | /* This function is called from address_check. It may recurse via | |
3611 | acl_check_condition() - hence the use of a level to stop looping. The ACL is | |
3612 | passed as a string which is expanded. A forced failure implies no access check | |
3613 | is required. If the result is a single word, it is taken as the name of an ACL | |
3614 | which is sought in the global ACL tree. Otherwise, it is taken as literal ACL | |
3615 | text, complete with newlines, and parsed as such. In both cases, the ACL check | |
3616 | is then run. This function uses an auxiliary function for acl_read() to call | |
3617 | for reading individual lines of a literal ACL. This is acl_getline(), which | |
3618 | appears immediately above. | |
3619 | ||
3620 | Arguments: | |
3621 | where where called from | |
3622 | addr address item when called from RCPT; otherwise NULL | |
3623 | s the input string; NULL is the same as an empty ACL => DENY | |
3624 | level the nesting level | |
3625 | user_msgptr where to put a user error (for SMTP response) | |
3626 | log_msgptr where to put a logging message (not for SMTP response) | |
3627 | ||
3628 | Returns: OK access is granted | |
3629 | DISCARD access is apparently granted... | |
3630 | FAIL access is denied | |
3631 | FAIL_DROP access is denied; drop the connection | |
3632 | DEFER can't tell at the moment | |
3633 | ERROR disaster | |
3634 | */ | |
3635 | ||
3636 | static int | |
3637 | acl_check_internal(int where, address_item *addr, uschar *s, int level, | |
3638 | uschar **user_msgptr, uschar **log_msgptr) | |
3639 | { | |
3640 | int fd = -1; | |
3641 | acl_block *acl = NULL; | |
3642 | uschar *acl_name = US"inline ACL"; | |
3643 | uschar *ss; | |
3644 | ||
3645 | /* Catch configuration loops */ | |
3646 | ||
3647 | if (level > 20) | |
3648 | { | |
3649 | *log_msgptr = US"ACL nested too deep: possible loop"; | |
3650 | return ERROR; | |
3651 | } | |
3652 | ||
3653 | if (s == NULL) | |
3654 | { | |
3655 | HDEBUG(D_acl) debug_printf("ACL is NULL: implicit DENY\n"); | |
3656 | return FAIL; | |
3657 | } | |
3658 | ||
3659 | /* At top level, we expand the incoming string. At lower levels, it has already | |
3660 | been expanded as part of condition processing. */ | |
3661 | ||
3662 | if (level == 0) | |
3663 | { | |
3664 | ss = expand_string(s); | |
3665 | if (ss == NULL) | |
3666 | { | |
3667 | if (expand_string_forcedfail) return OK; | |
3668 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s, | |
3669 | expand_string_message); | |
3670 | return ERROR; | |
3671 | } | |
3672 | } | |
3673 | else ss = s; | |
3674 | ||
3675 | while (isspace(*ss))ss++; | |
3676 | ||
3677 | /* If we can't find a named ACL, the default is to parse it as an inline one. | |
3678 | (Unless it begins with a slash; non-existent files give rise to an error.) */ | |
3679 | ||
3680 | acl_text = ss; | |
3681 | ||
3682 | /* Handle the case of a string that does not contain any spaces. Look for a | |
3683 | named ACL among those read from the configuration, or a previously read file. | |
3684 | It is possible that the pointer to the ACL is NULL if the configuration | |
3685 | contains a name with no data. If not found, and the text begins with '/', | |
3686 | read an ACL from a file, and save it so it can be re-used. */ | |
3687 | ||
3688 | if (Ustrchr(ss, ' ') == NULL) | |
3689 | { | |
3690 | tree_node *t = tree_search(acl_anchor, ss); | |
3691 | if (t != NULL) | |
3692 | { | |
3693 | acl = (acl_block *)(t->data.ptr); | |
3694 | if (acl == NULL) | |
3695 | { | |
3696 | HDEBUG(D_acl) debug_printf("ACL \"%s\" is empty: implicit DENY\n", ss); | |
3697 | return FAIL; | |
3698 | } | |
3699 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
3700 | HDEBUG(D_acl) debug_printf("using ACL \"%s\"\n", ss); | |
3701 | } | |
3702 | ||
3703 | else if (*ss == '/') | |
3704 | { | |
3705 | struct stat statbuf; | |
3706 | fd = Uopen(ss, O_RDONLY, 0); | |
3707 | if (fd < 0) | |
3708 | { | |
3709 | *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss, | |
3710 | strerror(errno)); | |
3711 | return ERROR; | |
3712 | } | |
3713 | ||
3714 | if (fstat(fd, &statbuf) != 0) | |
3715 | { | |
3716 | *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss, | |
3717 | strerror(errno)); | |
3718 | return ERROR; | |
3719 | } | |
3720 | ||
3721 | acl_text = store_get(statbuf.st_size + 1); | |
3722 | acl_text_end = acl_text + statbuf.st_size + 1; | |
3723 | ||
3724 | if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size) | |
3725 | { | |
3726 | *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s", | |
3727 | ss, strerror(errno)); | |
3728 | return ERROR; | |
3729 | } | |
3730 | acl_text[statbuf.st_size] = 0; | |
f1e894f3 | 3731 | (void)close(fd); |
059ec3d9 PH |
3732 | |
3733 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
3734 | HDEBUG(D_acl) debug_printf("read ACL from file %s\n", ss); | |
3735 | } | |
3736 | } | |
3737 | ||
3738 | /* Parse an ACL that is still in text form. If it came from a file, remember it | |
3739 | in the ACL tree, having read it into the POOL_PERM store pool so that it | |
3740 | persists between multiple messages. */ | |
3741 | ||
3742 | if (acl == NULL) | |
3743 | { | |
3744 | int old_pool = store_pool; | |
3745 | if (fd >= 0) store_pool = POOL_PERM; | |
3746 | acl = acl_read(acl_getline, log_msgptr); | |
3747 | store_pool = old_pool; | |
3748 | if (acl == NULL && *log_msgptr != NULL) return ERROR; | |
3749 | if (fd >= 0) | |
3750 | { | |
3751 | tree_node *t = store_get_perm(sizeof(tree_node) + Ustrlen(ss)); | |
3752 | Ustrcpy(t->name, ss); | |
3753 | t->data.ptr = acl; | |
3754 | (void)tree_insertnode(&acl_anchor, t); | |
3755 | } | |
3756 | } | |
3757 | ||
3758 | /* Now we have an ACL to use. It's possible it may be NULL. */ | |
3759 | ||
3760 | while (acl != NULL) | |
3761 | { | |
3762 | int cond; | |
3763 | int basic_errno = 0; | |
3764 | BOOL endpass_seen = FALSE; | |
3765 | ||
3766 | *log_msgptr = *user_msgptr = NULL; | |
3767 | acl_temp_details = FALSE; | |
3768 | ||
7353285c | 3769 | if ((where == ACL_WHERE_QUIT || where == ACL_WHERE_NOTQUIT) && |
059ec3d9 PH |
3770 | acl->verb != ACL_ACCEPT && |
3771 | acl->verb != ACL_WARN) | |
3772 | { | |
7353285c | 3773 | *log_msgptr = string_sprintf("\"%s\" is not allowed in a QUIT or not-QUIT ACL", |
059ec3d9 PH |
3774 | verbs[acl->verb]); |
3775 | return ERROR; | |
3776 | } | |
3777 | ||
3778 | HDEBUG(D_acl) debug_printf("processing \"%s\"\n", verbs[acl->verb]); | |
3779 | ||
3780 | /* Clear out any search error message from a previous check before testing | |
3781 | this condition. */ | |
3782 | ||
3783 | search_error_message = NULL; | |
3784 | cond = acl_check_condition(acl->verb, acl->condition, where, addr, level, | |
3785 | &endpass_seen, user_msgptr, log_msgptr, &basic_errno); | |
3786 | ||
3787 | /* Handle special returns: DEFER causes a return except on a WARN verb; | |
3788 | ERROR always causes a return. */ | |
3789 | ||
3790 | switch (cond) | |
3791 | { | |
3792 | case DEFER: | |
6968512f | 3793 | HDEBUG(D_acl) debug_printf("%s: condition test deferred in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
3794 | if (basic_errno != ERRNO_CALLOUTDEFER) |
3795 | { | |
3796 | if (search_error_message != NULL && *search_error_message != 0) | |
3797 | *log_msgptr = search_error_message; | |
3798 | if (smtp_return_error_details) acl_temp_details = TRUE; | |
3799 | } | |
3800 | else | |
3801 | { | |
3802 | acl_temp_details = TRUE; | |
3803 | } | |
3804 | if (acl->verb != ACL_WARN) return DEFER; | |
3805 | break; | |
3806 | ||
3807 | default: /* Paranoia */ | |
3808 | case ERROR: | |
6968512f | 3809 | HDEBUG(D_acl) debug_printf("%s: condition test error in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
3810 | return ERROR; |
3811 | ||
3812 | case OK: | |
6968512f JH |
3813 | HDEBUG(D_acl) debug_printf("%s: condition test succeeded in %s\n", |
3814 | verbs[acl->verb], acl_name); | |
059ec3d9 PH |
3815 | break; |
3816 | ||
3817 | case FAIL: | |
6968512f | 3818 | HDEBUG(D_acl) debug_printf("%s: condition test failed in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
3819 | break; |
3820 | ||
3821 | /* DISCARD and DROP can happen only from a nested ACL condition, and | |
3822 | DISCARD can happen only for an "accept" or "discard" verb. */ | |
3823 | ||
3824 | case DISCARD: | |
6968512f JH |
3825 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"discard\" in %s\n", |
3826 | verbs[acl->verb], acl_name); | |
059ec3d9 PH |
3827 | break; |
3828 | ||
3829 | case FAIL_DROP: | |
6968512f JH |
3830 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"drop\" in %s\n", |
3831 | verbs[acl->verb], acl_name); | |
059ec3d9 PH |
3832 | break; |
3833 | } | |
3834 | ||
3835 | /* At this point, cond for most verbs is either OK or FAIL or (as a result of | |
3836 | a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and | |
3837 | for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */ | |
3838 | ||
3839 | switch(acl->verb) | |
3840 | { | |
3841 | case ACL_ACCEPT: | |
3842 | if (cond == OK || cond == DISCARD) return cond; | |
3843 | if (endpass_seen) | |
3844 | { | |
3845 | HDEBUG(D_acl) debug_printf("accept: endpass encountered - denying access\n"); | |
3846 | return cond; | |
3847 | } | |
3848 | break; | |
3849 | ||
3850 | case ACL_DEFER: | |
3851 | if (cond == OK) | |
3852 | { | |
3853 | acl_temp_details = TRUE; | |
3854 | return DEFER; | |
3855 | } | |
3856 | break; | |
3857 | ||
3858 | case ACL_DENY: | |
3859 | if (cond == OK) return FAIL; | |
3860 | break; | |
3861 | ||
3862 | case ACL_DISCARD: | |
3863 | if (cond == OK || cond == DISCARD) return DISCARD; | |
3864 | if (endpass_seen) | |
3865 | { | |
3866 | HDEBUG(D_acl) debug_printf("discard: endpass encountered - denying access\n"); | |
3867 | return cond; | |
3868 | } | |
3869 | break; | |
3870 | ||
3871 | case ACL_DROP: | |
3872 | if (cond == OK) return FAIL_DROP; | |
3873 | break; | |
3874 | ||
3875 | case ACL_REQUIRE: | |
3876 | if (cond != OK) return cond; | |
3877 | break; | |
3878 | ||
3879 | case ACL_WARN: | |
3880 | if (cond == OK) | |
3881 | acl_warn(where, *user_msgptr, *log_msgptr); | |
49826d12 | 3882 | else if (cond == DEFER && (log_extra_selector & LX_acl_warn_skipped) != 0) |
9c7a242c PH |
3883 | log_write(0, LOG_MAIN, "%s Warning: ACL \"warn\" statement skipped: " |
3884 | "condition test deferred%s%s", host_and_ident(TRUE), | |
3885 | (*log_msgptr == NULL)? US"" : US": ", | |
3886 | (*log_msgptr == NULL)? US"" : *log_msgptr); | |
059ec3d9 PH |
3887 | *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */ |
3888 | break; | |
3889 | ||
3890 | default: | |
3891 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d", | |
3892 | acl->verb); | |
3893 | break; | |
3894 | } | |
3895 | ||
3896 | /* Pass to the next ACL item */ | |
3897 | ||
3898 | acl = acl->next; | |
3899 | } | |
3900 | ||
3901 | /* We have reached the end of the ACL. This is an implicit DENY. */ | |
3902 | ||
3903 | HDEBUG(D_acl) debug_printf("end of %s: implicit DENY\n", acl_name); | |
3904 | return FAIL; | |
3905 | } | |
3906 | ||
3907 | ||
333eea9c JH |
3908 | |
3909 | ||
3910 | /* Same args as acl_check_internal() above, but the string s is | |
3911 | the name of an ACL followed optionally by up to 9 space-separated arguments. | |
3912 | The name and args are separately expanded. Args go into $acl_arg globals. */ | |
f60d98e8 JH |
3913 | static int |
3914 | acl_check_wargs(int where, address_item *addr, uschar *s, int level, | |
333eea9c JH |
3915 | uschar **user_msgptr, uschar **log_msgptr) |
3916 | { | |
3917 | uschar * tmp; | |
bef3ea7f | 3918 | uschar * tmp_arg[9]; /* must match acl_arg[] */ |
333eea9c | 3919 | uschar * name; |
bef3ea7f | 3920 | int i; |
333eea9c JH |
3921 | |
3922 | if (!(tmp = string_dequote(&s)) || !(name = expand_string(tmp))) | |
3923 | goto bad; | |
3924 | ||
bef3ea7f | 3925 | for (i = 0; i < 9; i++) |
333eea9c JH |
3926 | { |
3927 | while (*s && isspace(*s)) s++; | |
3928 | if (!*s) break; | |
bef3ea7f | 3929 | if (!(tmp = string_dequote(&s)) || !(tmp_arg[i] = expand_string(tmp))) |
333eea9c JH |
3930 | { |
3931 | tmp = name; | |
3932 | goto bad; | |
3933 | } | |
3934 | } | |
bef3ea7f JH |
3935 | acl_narg = i; |
3936 | for (i = 0; i < acl_narg; i++) acl_arg[i] = tmp_arg[i]; | |
3937 | while (i < 9) acl_arg[i++] = NULL; | |
333eea9c | 3938 | |
bef3ea7f | 3939 | return acl_check_internal(where, addr, name, level, user_msgptr, log_msgptr); |
333eea9c JH |
3940 | |
3941 | bad: | |
3942 | if (expand_string_forcedfail) return ERROR; | |
3943 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
3944 | tmp, expand_string_message); | |
3945 | return search_find_defer?DEFER:ERROR; | |
3946 | } | |
3947 | ||
3948 | ||
3949 | ||
059ec3d9 PH |
3950 | /************************************************* |
3951 | * Check access using an ACL * | |
3952 | *************************************************/ | |
3953 | ||
3954 | /* This is the external interface for ACL checks. It sets up an address and the | |
3955 | expansions for $domain and $local_part when called after RCPT, then calls | |
3956 | acl_check_internal() to do the actual work. | |
3957 | ||
3958 | Arguments: | |
3959 | where ACL_WHERE_xxxx indicating where called from | |
64ffc24f | 3960 | recipient RCPT address for RCPT check, else NULL |
059ec3d9 PH |
3961 | s the input string; NULL is the same as an empty ACL => DENY |
3962 | user_msgptr where to put a user error (for SMTP response) | |
3963 | log_msgptr where to put a logging message (not for SMTP response) | |
3964 | ||
3965 | Returns: OK access is granted by an ACCEPT verb | |
3966 | DISCARD access is granted by a DISCARD verb | |
3967 | FAIL access is denied | |
3968 | FAIL_DROP access is denied; drop the connection | |
3969 | DEFER can't tell at the moment | |
3970 | ERROR disaster | |
3971 | */ | |
3972 | ||
3973 | int | |
64ffc24f | 3974 | acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr, |
059ec3d9 PH |
3975 | uschar **log_msgptr) |
3976 | { | |
3977 | int rc; | |
3978 | address_item adb; | |
64ffc24f | 3979 | address_item *addr = NULL; |
059ec3d9 PH |
3980 | |
3981 | *user_msgptr = *log_msgptr = NULL; | |
3982 | sender_verified_failed = NULL; | |
fe0dab11 | 3983 | ratelimiters_cmd = NULL; |
6ea85e9a | 3984 | log_reject_target = LOG_MAIN|LOG_REJECT; |
059ec3d9 PH |
3985 | |
3986 | if (where == ACL_WHERE_RCPT) | |
3987 | { | |
3988 | adb = address_defaults; | |
3989 | addr = &adb; | |
64ffc24f | 3990 | addr->address = recipient; |
059ec3d9 PH |
3991 | if (deliver_split_address(addr) == DEFER) |
3992 | { | |
3993 | *log_msgptr = US"defer in percent_hack_domains check"; | |
3994 | return DEFER; | |
3995 | } | |
3996 | deliver_domain = addr->domain; | |
3997 | deliver_localpart = addr->local_part; | |
3998 | } | |
059ec3d9 PH |
3999 | |
4000 | rc = acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr); | |
4001 | ||
817d9f57 JH |
4002 | /* Cutthrough - if requested, |
4003 | and WHERE_RCPT and not yet opened conn as result of recipient-verify, | |
4004 | and rcpt acl returned accept, | |
4005 | and first recipient (cancel on any subsequents) | |
e4bdf652 | 4006 | open one now and run it up to RCPT acceptance. |
e4bdf652 | 4007 | A failed verify should cancel cutthrough request. |
e4bdf652 | 4008 | |
817d9f57 | 4009 | Initial implementation: dual-write to spool. |
e4bdf652 JH |
4010 | Assume the rxd datastream is now being copied byte-for-byte to an open cutthrough connection. |
4011 | ||
4012 | Cease cutthrough copy on rxd final dot; do not send one. | |
4013 | ||
4014 | On a data acl, if not accept and a cutthrough conn is open, hard-close it (no SMTP niceness). | |
4015 | ||
4016 | On data acl accept, terminate the dataphase on an open cutthrough conn. If accepted or | |
4017 | perm-rejected, reflect that to the original sender - and dump the spooled copy. | |
4018 | If temp-reject, close the conn (and keep the spooled copy). | |
4019 | If conn-failure, no action (and keep the spooled copy). | |
e4bdf652 JH |
4020 | */ |
4021 | switch (where) | |
4022 | { | |
4023 | case ACL_WHERE_RCPT: | |
4024 | if( rcpt_count > 1 ) | |
2e5b33cd | 4025 | cancel_cutthrough_connection("more than one recipient"); |
e4bdf652 JH |
4026 | else if (rc == OK && cutthrough_delivery && cutthrough_fd < 0) |
4027 | open_cutthrough_connection(addr); | |
4028 | break; | |
4029 | ||
4030 | case ACL_WHERE_PREDATA: | |
4031 | if( rc == OK ) | |
4032 | cutthrough_predata(); | |
4033 | else | |
2e5b33cd | 4034 | cancel_cutthrough_connection("predata acl not ok"); |
e4bdf652 JH |
4035 | break; |
4036 | ||
4037 | case ACL_WHERE_QUIT: | |
4038 | case ACL_WHERE_NOTQUIT: | |
2e5b33cd | 4039 | cancel_cutthrough_connection("quit or notquit"); |
e4bdf652 JH |
4040 | break; |
4041 | ||
4042 | default: | |
4043 | break; | |
4044 | } | |
4045 | ||
64ffc24f PH |
4046 | deliver_domain = deliver_localpart = deliver_address_data = |
4047 | sender_address_data = NULL; | |
059ec3d9 PH |
4048 | |
4049 | /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA | |
4050 | ACL, which is really in the middle of an SMTP command. */ | |
4051 | ||
4052 | if (rc == DISCARD) | |
4053 | { | |
4054 | if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA) | |
4055 | { | |
4056 | log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s " | |
4057 | "ACL", acl_wherenames[where]); | |
4058 | return ERROR; | |
4059 | } | |
4060 | return DISCARD; | |
4061 | } | |
4062 | ||
4063 | /* A DROP response is not permitted from MAILAUTH */ | |
4064 | ||
4065 | if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH) | |
4066 | { | |
4067 | log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s " | |
4068 | "ACL", acl_wherenames[where]); | |
4069 | return ERROR; | |
4070 | } | |
4071 | ||
4e88a19f PH |
4072 | /* Before giving a response, take a look at the length of any user message, and |
4073 | split it up into multiple lines if possible. */ | |
059ec3d9 | 4074 | |
e28326d8 PH |
4075 | *user_msgptr = string_split_message(*user_msgptr); |
4076 | if (fake_response != OK) | |
4077 | fake_response_text = string_split_message(fake_response_text); | |
059ec3d9 PH |
4078 | |
4079 | return rc; | |
4080 | } | |
4081 | ||
38a0a95f PH |
4082 | |
4083 | ||
4084 | /************************************************* | |
4085 | * Create ACL variable * | |
4086 | *************************************************/ | |
4087 | ||
4088 | /* Create an ACL variable or reuse an existing one. ACL variables are in a | |
4089 | binary tree (see tree.c) with acl_var_c and acl_var_m as root nodes. | |
4090 | ||
4091 | Argument: | |
4092 | name pointer to the variable's name, starting with c or m | |
4093 | ||
4094 | Returns the pointer to variable's tree node | |
4095 | */ | |
4096 | ||
4097 | tree_node * | |
4098 | acl_var_create(uschar *name) | |
4099 | { | |
4100 | tree_node *node, **root; | |
4101 | root = (name[0] == 'c')? &acl_var_c : &acl_var_m; | |
4102 | node = tree_search(*root, name); | |
4103 | if (node == NULL) | |
4104 | { | |
4105 | node = store_get(sizeof(tree_node) + Ustrlen(name)); | |
4106 | Ustrcpy(node->name, name); | |
4107 | (void)tree_insertnode(root, node); | |
4108 | } | |
4109 | node->data.ptr = NULL; | |
4110 | return node; | |
4111 | } | |
4112 | ||
4113 | ||
4114 | ||
4115 | /************************************************* | |
4116 | * Write an ACL variable in spool format * | |
4117 | *************************************************/ | |
4118 | ||
4119 | /* This function is used as a callback for tree_walk when writing variables to | |
4120 | the spool file. To retain spool file compatibility, what is written is -aclc or | |
4121 | -aclm followed by the rest of the name and the data length, space separated, | |
4122 | then the value itself, starting on a new line, and terminated by an additional | |
4123 | newline. When we had only numbered ACL variables, the first line might look | |
4124 | like this: "-aclc 5 20". Now it might be "-aclc foo 20" for the variable called | |
4125 | acl_cfoo. | |
4126 | ||
4127 | Arguments: | |
4128 | name of the variable | |
4129 | value of the variable | |
4130 | ctx FILE pointer (as a void pointer) | |
4131 | ||
4132 | Returns: nothing | |
4133 | */ | |
4134 | ||
4135 | void | |
4136 | acl_var_write(uschar *name, uschar *value, void *ctx) | |
4137 | { | |
4138 | FILE *f = (FILE *)ctx; | |
4139 | fprintf(f, "-acl%c %s %d\n%s\n", name[0], name+1, Ustrlen(value), value); | |
4140 | } | |
4141 | ||
059ec3d9 | 4142 | /* End of acl.c */ |