Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
5a66c31b | 5 | /* Copyright (c) University of Cambridge 1995 - 2014 */ |
059ec3d9 PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | /* Code for handling Access Control Lists (ACLs) */ | |
9 | ||
10 | #include "exim.h" | |
11 | ||
12 | ||
13 | /* Default callout timeout */ | |
14 | ||
15 | #define CALLOUT_TIMEOUT_DEFAULT 30 | |
16 | ||
17 | /* ACL verb codes - keep in step with the table of verbs that follows */ | |
18 | ||
19 | enum { ACL_ACCEPT, ACL_DEFER, ACL_DENY, ACL_DISCARD, ACL_DROP, ACL_REQUIRE, | |
20 | ACL_WARN }; | |
21 | ||
22 | /* ACL verbs */ | |
23 | ||
f9d04f08 JH |
24 | static uschar *verbs[] = { |
25 | US"accept", | |
26 | US"defer", | |
27 | US"deny", | |
28 | US"discard", | |
29 | US"drop", | |
30 | US"require", | |
059ec3d9 PH |
31 | US"warn" }; |
32 | ||
4e88a19f PH |
33 | /* For each verb, the conditions for which "message" or "log_message" are used |
34 | are held as a bitmap. This is to avoid expanding the strings unnecessarily. For | |
35 | "accept", the FAIL case is used only after "endpass", but that is selected in | |
36 | the code. */ | |
37 | ||
38 | static int msgcond[] = { | |
39 | (1<<OK) | (1<<FAIL) | (1<<FAIL_DROP), /* accept */ | |
40 | (1<<OK), /* defer */ | |
41 | (1<<OK), /* deny */ | |
42 | (1<<OK) | (1<<FAIL) | (1<<FAIL_DROP), /* discard */ | |
43 | (1<<OK), /* drop */ | |
44 | (1<<FAIL) | (1<<FAIL_DROP), /* require */ | |
45 | (1<<OK) /* warn */ | |
46 | }; | |
059ec3d9 PH |
47 | |
48 | /* ACL condition and modifier codes - keep in step with the table that | |
71fafd95 PH |
49 | follows, and the cond_expand_at_top and uschar cond_modifiers tables lower |
50 | down. */ | |
059ec3d9 | 51 | |
71fafd95 PH |
52 | enum { ACLC_ACL, |
53 | ACLC_ADD_HEADER, | |
54 | ACLC_AUTHENTICATED, | |
8523533c TK |
55 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
56 | ACLC_BMI_OPTIN, | |
57 | #endif | |
71fafd95 | 58 | ACLC_CONDITION, |
c3611384 | 59 | ACLC_CONTINUE, |
71fafd95 | 60 | ACLC_CONTROL, |
6a8f9482 TK |
61 | #ifdef EXPERIMENTAL_DCC |
62 | ACLC_DCC, | |
63 | #endif | |
8523533c TK |
64 | #ifdef WITH_CONTENT_SCAN |
65 | ACLC_DECODE, | |
66 | #endif | |
67 | ACLC_DELAY, | |
68 | #ifdef WITH_OLD_DEMIME | |
69 | ACLC_DEMIME, | |
fb2274d4 | 70 | #endif |
80a47a2c TK |
71 | #ifndef DISABLE_DKIM |
72 | ACLC_DKIM_SIGNER, | |
73 | ACLC_DKIM_STATUS, | |
4840604e TL |
74 | #endif |
75 | #ifdef EXPERIMENTAL_DMARC | |
76 | ACLC_DMARC_STATUS, | |
8e669ac1 | 77 | #endif |
71fafd95 PH |
78 | ACLC_DNSLISTS, |
79 | ACLC_DOMAINS, | |
80 | ACLC_ENCRYPTED, | |
81 | ACLC_ENDPASS, | |
82 | ACLC_HOSTS, | |
83 | ACLC_LOCAL_PARTS, | |
84 | ACLC_LOG_MESSAGE, | |
6ea85e9a | 85 | ACLC_LOG_REJECT_TARGET, |
71fafd95 | 86 | ACLC_LOGWRITE, |
8523533c TK |
87 | #ifdef WITH_CONTENT_SCAN |
88 | ACLC_MALWARE, | |
89 | #endif | |
90 | ACLC_MESSAGE, | |
91 | #ifdef WITH_CONTENT_SCAN | |
92 | ACLC_MIME_REGEX, | |
93 | #endif | |
870f6ba8 | 94 | ACLC_RATELIMIT, |
8523533c TK |
95 | ACLC_RECIPIENTS, |
96 | #ifdef WITH_CONTENT_SCAN | |
97 | ACLC_REGEX, | |
98 | #endif | |
e7568d51 | 99 | ACLC_REMOVE_HEADER, |
71fafd95 PH |
100 | ACLC_SENDER_DOMAINS, |
101 | ACLC_SENDERS, | |
102 | ACLC_SET, | |
8523533c | 103 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 104 | ACLC_SPAM, |
8523533c TK |
105 | #endif |
106 | #ifdef EXPERIMENTAL_SPF | |
107 | ACLC_SPF, | |
65a7d8c3 | 108 | ACLC_SPF_GUESS, |
8523533c | 109 | #endif |
b0019c78 | 110 | ACLC_UDPSEND, |
8523533c | 111 | ACLC_VERIFY }; |
059ec3d9 | 112 | |
c3611384 PH |
113 | /* ACL conditions/modifiers: "delay", "control", "continue", "endpass", |
114 | "message", "log_message", "log_reject_target", "logwrite", and "set" are | |
115 | modifiers that look like conditions but always return TRUE. They are used for | |
116 | their side effects. */ | |
059ec3d9 | 117 | |
9a26b6b2 PH |
118 | static uschar *conditions[] = { |
119 | US"acl", | |
71fafd95 | 120 | US"add_header", |
9a26b6b2 | 121 | US"authenticated", |
8523533c TK |
122 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
123 | US"bmi_optin", | |
124 | #endif | |
125 | US"condition", | |
c3611384 | 126 | US"continue", |
8e669ac1 | 127 | US"control", |
6a8f9482 TK |
128 | #ifdef EXPERIMENTAL_DCC |
129 | US"dcc", | |
130 | #endif | |
8523533c TK |
131 | #ifdef WITH_CONTENT_SCAN |
132 | US"decode", | |
133 | #endif | |
134 | US"delay", | |
135 | #ifdef WITH_OLD_DEMIME | |
136 | US"demime", | |
fb2274d4 | 137 | #endif |
80a47a2c TK |
138 | #ifndef DISABLE_DKIM |
139 | US"dkim_signers", | |
140 | US"dkim_status", | |
4840604e TL |
141 | #endif |
142 | #ifdef EXPERIMENTAL_DMARC | |
143 | US"dmarc_status", | |
8523533c | 144 | #endif |
6ea85e9a PH |
145 | US"dnslists", |
146 | US"domains", | |
147 | US"encrypted", | |
148 | US"endpass", | |
149 | US"hosts", | |
150 | US"local_parts", | |
151 | US"log_message", | |
152 | US"log_reject_target", | |
153 | US"logwrite", | |
8523533c TK |
154 | #ifdef WITH_CONTENT_SCAN |
155 | US"malware", | |
156 | #endif | |
157 | US"message", | |
158 | #ifdef WITH_CONTENT_SCAN | |
159 | US"mime_regex", | |
160 | #endif | |
870f6ba8 | 161 | US"ratelimit", |
8523533c TK |
162 | US"recipients", |
163 | #ifdef WITH_CONTENT_SCAN | |
164 | US"regex", | |
165 | #endif | |
e7568d51 | 166 | US"remove_header", |
8523533c TK |
167 | US"sender_domains", US"senders", US"set", |
168 | #ifdef WITH_CONTENT_SCAN | |
169 | US"spam", | |
170 | #endif | |
171 | #ifdef EXPERIMENTAL_SPF | |
172 | US"spf", | |
65a7d8c3 | 173 | US"spf_guess", |
8523533c | 174 | #endif |
b0019c78 | 175 | US"udpsend", |
059ec3d9 | 176 | US"verify" }; |
8e669ac1 | 177 | |
c5fcb476 | 178 | |
9a26b6b2 PH |
179 | /* Return values from decode_control(); keep in step with the table of names |
180 | that follows! */ | |
181 | ||
182 | enum { | |
c46782ef | 183 | CONTROL_AUTH_UNADVERTISED, |
3c8b3577 | 184 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
9a26b6b2 | 185 | CONTROL_BMI_RUN, |
3c8b3577 | 186 | #endif |
ed7f7860 | 187 | CONTROL_DEBUG, |
3c8b3577 | 188 | #ifndef DISABLE_DKIM |
f7572e5a | 189 | CONTROL_DKIM_VERIFY, |
3c8b3577 JH |
190 | #endif |
191 | #ifdef EXPERIMENTAL_DMARC | |
4840604e TL |
192 | CONTROL_DMARC_VERIFY, |
193 | CONTROL_DMARC_FORENSIC, | |
3c8b3577 | 194 | #endif |
13363eba | 195 | CONTROL_DSCP, |
c46782ef PH |
196 | CONTROL_ERROR, |
197 | CONTROL_CASEFUL_LOCAL_PART, | |
198 | CONTROL_CASELOWER_LOCAL_PART, | |
e4bdf652 | 199 | CONTROL_CUTTHROUGH_DELIVERY, |
c46782ef PH |
200 | CONTROL_ENFORCE_SYNC, |
201 | CONTROL_NO_ENFORCE_SYNC, | |
202 | CONTROL_FREEZE, | |
203 | CONTROL_QUEUE_ONLY, | |
204 | CONTROL_SUBMISSION, | |
205 | CONTROL_SUPPRESS_LOCAL_FIXUPS, | |
3c8b3577 | 206 | #ifdef WITH_CONTENT_SCAN |
9a26b6b2 | 207 | CONTROL_NO_MBOX_UNSPOOL, |
3c8b3577 | 208 | #endif |
c46782ef PH |
209 | CONTROL_FAKEDEFER, |
210 | CONTROL_FAKEREJECT, | |
3c8b3577 JH |
211 | #ifdef EXPERIMENTAL_INTERNATIONAL |
212 | CONTROL_UTF8_DOWNCONVERT, | |
213 | #endif | |
cf8b11a5 | 214 | CONTROL_NO_MULTILINE, |
047bdd8c | 215 | CONTROL_NO_PIPELINING, |
4c590bd1 PH |
216 | CONTROL_NO_DELAY_FLUSH, |
217 | CONTROL_NO_CALLOUT_FLUSH | |
c46782ef | 218 | }; |
9a26b6b2 | 219 | |
8800895a PH |
220 | /* ACL control names; keep in step with the table above! This list is used for |
221 | turning ids into names. The actual list of recognized names is in the variable | |
222 | control_def controls_list[] below. The fact that there are two lists is a mess | |
223 | and should be tidied up. */ | |
9a26b6b2 PH |
224 | |
225 | static uschar *controls[] = { | |
c46782ef | 226 | US"allow_auth_unadvertised", |
3c8b3577 | 227 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
9a26b6b2 | 228 | US"bmi_run", |
3c8b3577 | 229 | #endif |
ed7f7860 | 230 | US"debug", |
3c8b3577 | 231 | #ifndef DISABLE_DKIM |
80a47a2c | 232 | US"dkim_disable_verify", |
3c8b3577 JH |
233 | #endif |
234 | #ifdef EXPERIMENTAL_DMARC | |
4840604e TL |
235 | US"dmarc_disable_verify", |
236 | US"dmarc_enable_forensic", | |
3c8b3577 | 237 | #endif |
13363eba | 238 | US"dscp", |
c46782ef PH |
239 | US"error", |
240 | US"caseful_local_part", | |
241 | US"caselower_local_part", | |
e4bdf652 | 242 | US"cutthrough_delivery", |
c46782ef PH |
243 | US"enforce_sync", |
244 | US"no_enforce_sync", | |
245 | US"freeze", | |
246 | US"queue_only", | |
247 | US"submission", | |
248 | US"suppress_local_fixups", | |
3c8b3577 | 249 | #ifdef WITH_CONTENT_SCAN |
9a26b6b2 | 250 | US"no_mbox_unspool", |
3c8b3577 | 251 | #endif |
cf8b11a5 PH |
252 | US"fakedefer", |
253 | US"fakereject", | |
3c8b3577 JH |
254 | #ifdef EXPERIMENTAL_INTERNATIONAL |
255 | US"utf8_downconvert", | |
256 | #endif | |
aa6dc513 | 257 | US"no_multiline_responses", |
cf8b11a5 | 258 | US"no_pipelining", |
4c590bd1 PH |
259 | US"no_delay_flush", |
260 | US"no_callout_flush" | |
c46782ef | 261 | }; |
059ec3d9 | 262 | |
047bdd8c | 263 | /* Flags to indicate for which conditions/modifiers a string expansion is done |
059ec3d9 PH |
264 | at the outer level. In the other cases, expansion already occurs in the |
265 | checking functions. */ | |
266 | ||
267 | static uschar cond_expand_at_top[] = { | |
7421ecab | 268 | FALSE, /* acl */ |
3e536984 | 269 | TRUE, /* add_header */ |
059ec3d9 | 270 | FALSE, /* authenticated */ |
8523533c TK |
271 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
272 | TRUE, /* bmi_optin */ | |
8e669ac1 | 273 | #endif |
059ec3d9 | 274 | TRUE, /* condition */ |
c3611384 | 275 | TRUE, /* continue */ |
059ec3d9 | 276 | TRUE, /* control */ |
6a8f9482 TK |
277 | #ifdef EXPERIMENTAL_DCC |
278 | TRUE, /* dcc */ | |
279 | #endif | |
8523533c TK |
280 | #ifdef WITH_CONTENT_SCAN |
281 | TRUE, /* decode */ | |
282 | #endif | |
059ec3d9 | 283 | TRUE, /* delay */ |
8523533c TK |
284 | #ifdef WITH_OLD_DEMIME |
285 | TRUE, /* demime */ | |
fb2274d4 | 286 | #endif |
80a47a2c TK |
287 | #ifndef DISABLE_DKIM |
288 | TRUE, /* dkim_signers */ | |
289 | TRUE, /* dkim_status */ | |
4840604e TL |
290 | #endif |
291 | #ifdef EXPERIMENTAL_DMARC | |
292 | TRUE, /* dmarc_status */ | |
8523533c | 293 | #endif |
059ec3d9 PH |
294 | TRUE, /* dnslists */ |
295 | FALSE, /* domains */ | |
296 | FALSE, /* encrypted */ | |
297 | TRUE, /* endpass */ | |
298 | FALSE, /* hosts */ | |
299 | FALSE, /* local_parts */ | |
300 | TRUE, /* log_message */ | |
6ea85e9a | 301 | TRUE, /* log_reject_target */ |
059ec3d9 | 302 | TRUE, /* logwrite */ |
8523533c TK |
303 | #ifdef WITH_CONTENT_SCAN |
304 | TRUE, /* malware */ | |
305 | #endif | |
059ec3d9 | 306 | TRUE, /* message */ |
8523533c TK |
307 | #ifdef WITH_CONTENT_SCAN |
308 | TRUE, /* mime_regex */ | |
309 | #endif | |
870f6ba8 | 310 | TRUE, /* ratelimit */ |
059ec3d9 | 311 | FALSE, /* recipients */ |
8523533c TK |
312 | #ifdef WITH_CONTENT_SCAN |
313 | TRUE, /* regex */ | |
314 | #endif | |
e7568d51 | 315 | TRUE, /* remove_header */ |
059ec3d9 PH |
316 | FALSE, /* sender_domains */ |
317 | FALSE, /* senders */ | |
318 | TRUE, /* set */ | |
8523533c TK |
319 | #ifdef WITH_CONTENT_SCAN |
320 | TRUE, /* spam */ | |
321 | #endif | |
322 | #ifdef EXPERIMENTAL_SPF | |
323 | TRUE, /* spf */ | |
65a7d8c3 | 324 | TRUE, /* spf_guess */ |
8523533c | 325 | #endif |
b0019c78 | 326 | TRUE, /* udpsend */ |
059ec3d9 PH |
327 | TRUE /* verify */ |
328 | }; | |
329 | ||
330 | /* Flags to identify the modifiers */ | |
331 | ||
332 | static uschar cond_modifiers[] = { | |
333 | FALSE, /* acl */ | |
3e536984 | 334 | TRUE, /* add_header */ |
059ec3d9 | 335 | FALSE, /* authenticated */ |
8523533c TK |
336 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
337 | TRUE, /* bmi_optin */ | |
8e669ac1 | 338 | #endif |
059ec3d9 | 339 | FALSE, /* condition */ |
c3611384 | 340 | TRUE, /* continue */ |
059ec3d9 | 341 | TRUE, /* control */ |
6a8f9482 TK |
342 | #ifdef EXPERIMENTAL_DCC |
343 | FALSE, /* dcc */ | |
344 | #endif | |
8523533c TK |
345 | #ifdef WITH_CONTENT_SCAN |
346 | FALSE, /* decode */ | |
347 | #endif | |
059ec3d9 | 348 | TRUE, /* delay */ |
8523533c TK |
349 | #ifdef WITH_OLD_DEMIME |
350 | FALSE, /* demime */ | |
fb2274d4 | 351 | #endif |
80a47a2c TK |
352 | #ifndef DISABLE_DKIM |
353 | FALSE, /* dkim_signers */ | |
354 | FALSE, /* dkim_status */ | |
4840604e TL |
355 | #endif |
356 | #ifdef EXPERIMENTAL_DMARC | |
357 | FALSE, /* dmarc_status */ | |
8523533c | 358 | #endif |
059ec3d9 PH |
359 | FALSE, /* dnslists */ |
360 | FALSE, /* domains */ | |
361 | FALSE, /* encrypted */ | |
362 | TRUE, /* endpass */ | |
363 | FALSE, /* hosts */ | |
364 | FALSE, /* local_parts */ | |
365 | TRUE, /* log_message */ | |
6ea85e9a | 366 | TRUE, /* log_reject_target */ |
8523533c TK |
367 | TRUE, /* logwrite */ |
368 | #ifdef WITH_CONTENT_SCAN | |
369 | FALSE, /* malware */ | |
370 | #endif | |
059ec3d9 | 371 | TRUE, /* message */ |
8523533c TK |
372 | #ifdef WITH_CONTENT_SCAN |
373 | FALSE, /* mime_regex */ | |
374 | #endif | |
870f6ba8 | 375 | FALSE, /* ratelimit */ |
059ec3d9 | 376 | FALSE, /* recipients */ |
8523533c TK |
377 | #ifdef WITH_CONTENT_SCAN |
378 | FALSE, /* regex */ | |
379 | #endif | |
e7568d51 | 380 | TRUE, /* remove_header */ |
059ec3d9 PH |
381 | FALSE, /* sender_domains */ |
382 | FALSE, /* senders */ | |
383 | TRUE, /* set */ | |
8523533c TK |
384 | #ifdef WITH_CONTENT_SCAN |
385 | FALSE, /* spam */ | |
386 | #endif | |
387 | #ifdef EXPERIMENTAL_SPF | |
388 | FALSE, /* spf */ | |
65a7d8c3 | 389 | FALSE, /* spf_guess */ |
8523533c | 390 | #endif |
b0019c78 | 391 | TRUE, /* udpsend */ |
059ec3d9 PH |
392 | FALSE /* verify */ |
393 | }; | |
394 | ||
c3611384 | 395 | /* Bit map vector of which conditions and modifiers are not allowed at certain |
8f128379 PH |
396 | times. For each condition and modifier, there's a bitmap of dis-allowed times. |
397 | For some, it is easier to specify the negation of a small number of allowed | |
398 | times. */ | |
059ec3d9 PH |
399 | |
400 | static unsigned int cond_forbids[] = { | |
401 | 0, /* acl */ | |
8e669ac1 | 402 | |
71fafd95 | 403 | (unsigned int) |
45b91596 | 404 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* add_header */ |
71fafd95 | 405 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
8ccd00b1 | 406 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
407 | (1<<ACL_WHERE_PRDR)| |
408 | #endif | |
45b91596 | 409 | (1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)| |
67caae1f | 410 | (1<<ACL_WHERE_DKIM)| |
45b91596 | 411 | (1<<ACL_WHERE_NOTSMTP_START)), |
71fafd95 | 412 | |
45b91596 PH |
413 | (1<<ACL_WHERE_NOTSMTP)| /* authenticated */ |
414 | (1<<ACL_WHERE_NOTSMTP_START)| | |
415 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO), | |
8e669ac1 | 416 | |
71fafd95 | 417 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
3864bb8e | 418 | (1<<ACL_WHERE_AUTH)| /* bmi_optin */ |
8523533c TK |
419 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
420 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_MIME)| | |
8ccd00b1 | 421 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
422 | (1<<ACL_WHERE_PRDR)| |
423 | #endif | |
8e669ac1 | 424 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
8523533c TK |
425 | (1<<ACL_WHERE_MAILAUTH)| |
426 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 PH |
427 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_PREDATA)| |
428 | (1<<ACL_WHERE_NOTSMTP_START), | |
71fafd95 | 429 | #endif |
8e669ac1 | 430 | |
059ec3d9 | 431 | 0, /* condition */ |
8e669ac1 | 432 | |
c3611384 PH |
433 | 0, /* continue */ |
434 | ||
059ec3d9 | 435 | /* Certain types of control are always allowed, so we let it through |
2f079f46 | 436 | always and check in the control processing itself. */ |
8e669ac1 | 437 | |
059ec3d9 | 438 | 0, /* control */ |
8e669ac1 | 439 | |
6a8f9482 TK |
440 | #ifdef EXPERIMENTAL_DCC |
441 | (unsigned int) | |
fd98a5c6 | 442 | ~((1<<ACL_WHERE_DATA)| /* dcc */ |
8ccd00b1 | 443 | #ifndef DISABLE_PRDR |
fd98a5c6 | 444 | (1<<ACL_WHERE_PRDR)| |
8ccd00b1 | 445 | #endif |
fd98a5c6 | 446 | (1<<ACL_WHERE_NOTSMTP)), |
6a8f9482 TK |
447 | #endif |
448 | ||
71fafd95 | 449 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
450 | (unsigned int) |
451 | ~(1<<ACL_WHERE_MIME), /* decode */ | |
71fafd95 | 452 | #endif |
8523533c | 453 | |
8f128379 | 454 | (1<<ACL_WHERE_NOTQUIT), /* delay */ |
8e669ac1 | 455 | |
71fafd95 | 456 | #ifdef WITH_OLD_DEMIME |
2f079f46 | 457 | (unsigned int) |
fd98a5c6 | 458 | ~((1<<ACL_WHERE_DATA)| /* demime */ |
8ccd00b1 | 459 | #ifndef DISABLE_PRDR |
fd98a5c6 | 460 | (1<<ACL_WHERE_PRDR)| |
8ccd00b1 | 461 | #endif |
fd98a5c6 | 462 | (1<<ACL_WHERE_NOTSMTP)), |
71fafd95 | 463 | #endif |
8e669ac1 | 464 | |
80a47a2c TK |
465 | #ifndef DISABLE_DKIM |
466 | (unsigned int) | |
467 | ~(1<<ACL_WHERE_DKIM), /* dkim_signers */ | |
84330b7b | 468 | |
80a47a2c TK |
469 | (unsigned int) |
470 | ~(1<<ACL_WHERE_DKIM), /* dkim_status */ | |
71fafd95 | 471 | #endif |
fb2274d4 | 472 | |
4840604e TL |
473 | #ifdef EXPERIMENTAL_DMARC |
474 | (unsigned int) | |
475 | ~(1<<ACL_WHERE_DATA), /* dmarc_status */ | |
476 | #endif | |
477 | ||
45b91596 PH |
478 | (1<<ACL_WHERE_NOTSMTP)| /* dnslists */ |
479 | (1<<ACL_WHERE_NOTSMTP_START), | |
059ec3d9 | 480 | |
2f079f46 | 481 | (unsigned int) |
fd98a5c6 | 482 | ~((1<<ACL_WHERE_RCPT) /* domains */ |
8ccd00b1 | 483 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
484 | |(1<<ACL_WHERE_PRDR) |
485 | #endif | |
486 | ), | |
059ec3d9 | 487 | |
45b91596 PH |
488 | (1<<ACL_WHERE_NOTSMTP)| /* encrypted */ |
489 | (1<<ACL_WHERE_CONNECT)| | |
490 | (1<<ACL_WHERE_NOTSMTP_START)| | |
059ec3d9 | 491 | (1<<ACL_WHERE_HELO), |
8e669ac1 | 492 | |
059ec3d9 | 493 | 0, /* endpass */ |
8e669ac1 | 494 | |
45b91596 PH |
495 | (1<<ACL_WHERE_NOTSMTP)| /* hosts */ |
496 | (1<<ACL_WHERE_NOTSMTP_START), | |
059ec3d9 | 497 | |
2f079f46 | 498 | (unsigned int) |
fd98a5c6 | 499 | ~((1<<ACL_WHERE_RCPT) /* local_parts */ |
2e6afa4f | 500 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
501 | |(1<<ACL_WHERE_PRDR) |
502 | #endif | |
503 | ), | |
059ec3d9 PH |
504 | |
505 | 0, /* log_message */ | |
8e669ac1 | 506 | |
6ea85e9a PH |
507 | 0, /* log_reject_target */ |
508 | ||
059ec3d9 | 509 | 0, /* logwrite */ |
8e669ac1 | 510 | |
71fafd95 | 511 | #ifdef WITH_CONTENT_SCAN |
2f079f46 | 512 | (unsigned int) |
fd98a5c6 | 513 | ~((1<<ACL_WHERE_DATA)| /* malware */ |
8ccd00b1 | 514 | #ifndef DISABLE_PRDR |
fd98a5c6 | 515 | (1<<ACL_WHERE_PRDR)| |
8ccd00b1 | 516 | #endif |
fd98a5c6 | 517 | (1<<ACL_WHERE_NOTSMTP)), |
71fafd95 | 518 | #endif |
8523533c | 519 | |
059ec3d9 PH |
520 | 0, /* message */ |
521 | ||
71fafd95 | 522 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
523 | (unsigned int) |
524 | ~(1<<ACL_WHERE_MIME), /* mime_regex */ | |
71fafd95 | 525 | #endif |
8523533c | 526 | |
870f6ba8 TF |
527 | 0, /* ratelimit */ |
528 | ||
2f079f46 PH |
529 | (unsigned int) |
530 | ~(1<<ACL_WHERE_RCPT), /* recipients */ | |
059ec3d9 | 531 | |
71fafd95 | 532 | #ifdef WITH_CONTENT_SCAN |
2f079f46 | 533 | (unsigned int) |
fd98a5c6 | 534 | ~((1<<ACL_WHERE_DATA)| /* regex */ |
8ccd00b1 | 535 | #ifndef DISABLE_PRDR |
fd98a5c6 | 536 | (1<<ACL_WHERE_PRDR)| |
8ccd00b1 | 537 | #endif |
fd98a5c6 | 538 | (1<<ACL_WHERE_NOTSMTP)| |
2f079f46 | 539 | (1<<ACL_WHERE_MIME)), |
71fafd95 | 540 | #endif |
8523533c | 541 | |
e7568d51 TL |
542 | (unsigned int) |
543 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* remove_header */ | |
544 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
8ccd00b1 | 545 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
546 | (1<<ACL_WHERE_PRDR)| |
547 | #endif | |
e7568d51 TL |
548 | (1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)| |
549 | (1<<ACL_WHERE_NOTSMTP_START)), | |
550 | ||
059ec3d9 PH |
551 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* sender_domains */ |
552 | (1<<ACL_WHERE_HELO)| | |
553 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
554 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
555 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
556 | ||
557 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* senders */ | |
558 | (1<<ACL_WHERE_HELO)| | |
559 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
560 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
561 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
562 | ||
563 | 0, /* set */ | |
564 | ||
71fafd95 | 565 | #ifdef WITH_CONTENT_SCAN |
2f079f46 | 566 | (unsigned int) |
fd98a5c6 | 567 | ~((1<<ACL_WHERE_DATA)| /* spam */ |
8ccd00b1 | 568 | #ifndef DISABLE_PRDR |
fd98a5c6 | 569 | (1<<ACL_WHERE_PRDR)| |
8ccd00b1 | 570 | #endif |
fd98a5c6 | 571 | (1<<ACL_WHERE_NOTSMTP)), |
71fafd95 | 572 | #endif |
8523533c | 573 | |
71fafd95 | 574 | #ifdef EXPERIMENTAL_SPF |
8523533c TK |
575 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf */ |
576 | (1<<ACL_WHERE_HELO)| | |
577 | (1<<ACL_WHERE_MAILAUTH)| | |
578 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
45b91596 PH |
579 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY)| |
580 | (1<<ACL_WHERE_NOTSMTP)| | |
581 | (1<<ACL_WHERE_NOTSMTP_START), | |
65a7d8c3 NM |
582 | |
583 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf_guess */ | |
584 | (1<<ACL_WHERE_HELO)| | |
585 | (1<<ACL_WHERE_MAILAUTH)| | |
586 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
587 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY)| | |
588 | (1<<ACL_WHERE_NOTSMTP)| | |
589 | (1<<ACL_WHERE_NOTSMTP_START), | |
71fafd95 | 590 | #endif |
8523533c | 591 | |
b0019c78 TF |
592 | 0, /* udpsend */ |
593 | ||
059ec3d9 PH |
594 | /* Certain types of verify are always allowed, so we let it through |
595 | always and check in the verify function itself */ | |
596 | ||
597 | 0 /* verify */ | |
059ec3d9 PH |
598 | }; |
599 | ||
600 | ||
c5fcb476 PH |
601 | /* Bit map vector of which controls are not allowed at certain times. For |
602 | each control, there's a bitmap of dis-allowed times. For some, it is easier to | |
603 | specify the negation of a small number of allowed times. */ | |
604 | ||
605 | static unsigned int control_forbids[] = { | |
c46782ef PH |
606 | (unsigned int) |
607 | ~((1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)), /* allow_auth_unadvertised */ | |
608 | ||
3c8b3577 | 609 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
8523533c | 610 | 0, /* bmi_run */ |
3c8b3577 | 611 | #endif |
c46782ef | 612 | |
ed7f7860 PP |
613 | 0, /* debug */ |
614 | ||
3c8b3577 | 615 | #ifndef DISABLE_DKIM |
80a47a2c | 616 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dkim_disable_verify */ |
3c8b3577 | 617 | # ifndef DISABLE_PRDR |
fd98a5c6 | 618 | (1<<ACL_WHERE_PRDR)| |
3c8b3577 | 619 | # endif |
f7572e5a | 620 | (1<<ACL_WHERE_NOTSMTP_START), |
3c8b3577 | 621 | #endif |
f7572e5a | 622 | |
3c8b3577 | 623 | #ifdef EXPERIMENTAL_DMARC |
4840604e TL |
624 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dmarc_disable_verify */ |
625 | (1<<ACL_WHERE_NOTSMTP_START), | |
626 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* dmarc_enable_forensic */ | |
627 | (1<<ACL_WHERE_NOTSMTP_START), | |
3c8b3577 | 628 | #endif |
4840604e | 629 | |
13363eba PP |
630 | (1<<ACL_WHERE_NOTSMTP)| |
631 | (1<<ACL_WHERE_NOTSMTP_START)| | |
632 | (1<<ACL_WHERE_NOTQUIT), /* dscp */ | |
633 | ||
c5fcb476 | 634 | 0, /* error */ |
8e669ac1 PH |
635 | |
636 | (unsigned int) | |
c5fcb476 | 637 | ~(1<<ACL_WHERE_RCPT), /* caseful_local_part */ |
8e669ac1 PH |
638 | |
639 | (unsigned int) | |
c5fcb476 | 640 | ~(1<<ACL_WHERE_RCPT), /* caselower_local_part */ |
8e669ac1 | 641 | |
e4bdf652 JH |
642 | (unsigned int) |
643 | 0, /* cutthrough_delivery */ | |
644 | ||
45b91596 PH |
645 | (1<<ACL_WHERE_NOTSMTP)| /* enforce_sync */ |
646 | (1<<ACL_WHERE_NOTSMTP_START), | |
8e669ac1 | 647 | |
45b91596 PH |
648 | (1<<ACL_WHERE_NOTSMTP)| /* no_enforce_sync */ |
649 | (1<<ACL_WHERE_NOTSMTP_START), | |
8e669ac1 PH |
650 | |
651 | (unsigned int) | |
c5fcb476 PH |
652 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* freeze */ |
653 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
fd98a5c6 | 654 | // (1<<ACL_WHERE_PRDR)| /* Not allow one user to freeze for all */ |
e715ad22 | 655 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
656 | |
657 | (unsigned int) | |
c5fcb476 PH |
658 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* queue_only */ |
659 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
fd98a5c6 | 660 | // (1<<ACL_WHERE_PRDR)| /* Not allow one user to freeze for all */ |
e715ad22 | 661 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
662 | |
663 | (unsigned int) | |
c5fcb476 | 664 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* submission */ |
8e669ac1 | 665 | (1<<ACL_WHERE_PREDATA)), |
8523533c | 666 | |
8800895a PH |
667 | (unsigned int) |
668 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* suppress_local_fixups */ | |
45b91596 PH |
669 | (1<<ACL_WHERE_PREDATA)| |
670 | (1<<ACL_WHERE_NOTSMTP_START)), | |
8800895a | 671 | |
3c8b3577 | 672 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 673 | (unsigned int) |
14d57970 | 674 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* no_mbox_unspool */ |
e715ad22 | 675 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
fd98a5c6 | 676 | // (1<<ACL_WHERE_PRDR)| /* Not allow one user to freeze for all */ |
e715ad22 | 677 | (1<<ACL_WHERE_MIME)), |
3c8b3577 | 678 | #endif |
a6c4ab60 | 679 | |
29aba418 TF |
680 | (unsigned int) |
681 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakedefer */ | |
682 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
3c8b3577 | 683 | #ifndef DISABLE_PRDR |
fd98a5c6 | 684 | (1<<ACL_WHERE_PRDR)| |
3c8b3577 | 685 | #endif |
29aba418 TF |
686 | (1<<ACL_WHERE_MIME)), |
687 | ||
8e669ac1 | 688 | (unsigned int) |
a6c4ab60 | 689 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakereject */ |
e715ad22 | 690 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
3c8b3577 | 691 | #ifndef DISABLE_PRDR |
fd98a5c6 | 692 | (1<<ACL_WHERE_PRDR)| |
3c8b3577 | 693 | #endif |
e715ad22 | 694 | (1<<ACL_WHERE_MIME)), |
8523533c | 695 | |
3c8b3577 JH |
696 | #ifdef EXPERIMENTAL_INTERNATIONAL |
697 | 0, /* utf8_downconvert */ | |
698 | #endif | |
699 | ||
45b91596 | 700 | (1<<ACL_WHERE_NOTSMTP)| /* no_multiline */ |
cf8b11a5 PH |
701 | (1<<ACL_WHERE_NOTSMTP_START), |
702 | ||
703 | (1<<ACL_WHERE_NOTSMTP)| /* no_pipelining */ | |
047bdd8c PH |
704 | (1<<ACL_WHERE_NOTSMTP_START), |
705 | ||
706 | (1<<ACL_WHERE_NOTSMTP)| /* no_delay_flush */ | |
4c590bd1 PH |
707 | (1<<ACL_WHERE_NOTSMTP_START), |
708 | ||
709 | (1<<ACL_WHERE_NOTSMTP)| /* no_callout_flush */ | |
45b91596 | 710 | (1<<ACL_WHERE_NOTSMTP_START) |
c5fcb476 PH |
711 | }; |
712 | ||
713 | /* Structure listing various control arguments, with their characteristics. */ | |
059ec3d9 PH |
714 | |
715 | typedef struct control_def { | |
716 | uschar *name; | |
717 | int value; /* CONTROL_xxx value */ | |
059ec3d9 PH |
718 | BOOL has_option; /* Has /option(s) following */ |
719 | } control_def; | |
720 | ||
721 | static control_def controls_list[] = { | |
3c8b3577 | 722 | { US"allow_auth_unadvertised", CONTROL_AUTH_UNADVERTISED, FALSE }, |
8523533c | 723 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
3c8b3577 | 724 | { US"bmi_run", CONTROL_BMI_RUN, FALSE }, |
fb2274d4 | 725 | #endif |
3c8b3577 | 726 | { US"debug", CONTROL_DEBUG, TRUE }, |
80a47a2c | 727 | #ifndef DISABLE_DKIM |
3c8b3577 | 728 | { US"dkim_disable_verify", CONTROL_DKIM_VERIFY, FALSE }, |
4840604e TL |
729 | #endif |
730 | #ifdef EXPERIMENTAL_DMARC | |
3c8b3577 JH |
731 | { US"dmarc_disable_verify", CONTROL_DMARC_VERIFY, FALSE }, |
732 | { US"dmarc_enable_forensic", CONTROL_DMARC_FORENSIC, FALSE }, | |
8523533c | 733 | #endif |
3c8b3577 JH |
734 | { US"dscp", CONTROL_DSCP, TRUE }, |
735 | { US"caseful_local_part", CONTROL_CASEFUL_LOCAL_PART, FALSE }, | |
736 | { US"caselower_local_part", CONTROL_CASELOWER_LOCAL_PART, FALSE }, | |
737 | { US"enforce_sync", CONTROL_ENFORCE_SYNC, FALSE }, | |
738 | { US"freeze", CONTROL_FREEZE, TRUE }, | |
739 | { US"no_callout_flush", CONTROL_NO_CALLOUT_FLUSH, FALSE }, | |
740 | { US"no_delay_flush", CONTROL_NO_DELAY_FLUSH, FALSE }, | |
741 | { US"no_enforce_sync", CONTROL_NO_ENFORCE_SYNC, FALSE }, | |
742 | { US"no_multiline_responses", CONTROL_NO_MULTILINE, FALSE }, | |
743 | { US"no_pipelining", CONTROL_NO_PIPELINING, FALSE }, | |
744 | { US"queue_only", CONTROL_QUEUE_ONLY, FALSE }, | |
8523533c | 745 | #ifdef WITH_CONTENT_SCAN |
3c8b3577 | 746 | { US"no_mbox_unspool", CONTROL_NO_MBOX_UNSPOOL, FALSE }, |
8523533c | 747 | #endif |
3c8b3577 JH |
748 | { US"fakedefer", CONTROL_FAKEDEFER, TRUE }, |
749 | { US"fakereject", CONTROL_FAKEREJECT, TRUE }, | |
750 | { US"submission", CONTROL_SUBMISSION, TRUE }, | |
e4bdf652 | 751 | { US"suppress_local_fixups", CONTROL_SUPPRESS_LOCAL_FIXUPS, FALSE }, |
3c8b3577 JH |
752 | { US"cutthrough_delivery", CONTROL_CUTTHROUGH_DELIVERY, FALSE }, |
753 | #ifdef EXPERIMENTAL_INTERNATIONAL | |
754 | { US"utf8_downconvert", CONTROL_UTF8_DOWNCONVERT, TRUE } | |
755 | #endif | |
059ec3d9 PH |
756 | }; |
757 | ||
e5a9dba6 PH |
758 | /* Support data structures for Client SMTP Authorization. acl_verify_csa() |
759 | caches its result in a tree to avoid repeated DNS queries. The result is an | |
760 | integer code which is used as an index into the following tables of | |
761 | explanatory strings and verification return codes. */ | |
762 | ||
763 | static tree_node *csa_cache = NULL; | |
764 | ||
765 | enum { CSA_UNKNOWN, CSA_OK, CSA_DEFER_SRV, CSA_DEFER_ADDR, | |
766 | CSA_FAIL_EXPLICIT, CSA_FAIL_DOMAIN, CSA_FAIL_NOADDR, CSA_FAIL_MISMATCH }; | |
767 | ||
768 | /* The acl_verify_csa() return code is translated into an acl_verify() return | |
769 | code using the following table. It is OK unless the client is definitely not | |
770 | authorized. This is because CSA is supposed to be optional for sending sites, | |
771 | so recipients should not be too strict about checking it - especially because | |
772 | DNS problems are quite likely to occur. It's possible to use $csa_status in | |
773 | further ACL conditions to distinguish ok, unknown, and defer if required, but | |
774 | the aim is to make the usual configuration simple. */ | |
775 | ||
776 | static int csa_return_code[] = { | |
777 | OK, OK, OK, OK, | |
778 | FAIL, FAIL, FAIL, FAIL | |
779 | }; | |
780 | ||
781 | static uschar *csa_status_string[] = { | |
782 | US"unknown", US"ok", US"defer", US"defer", | |
783 | US"fail", US"fail", US"fail", US"fail" | |
784 | }; | |
785 | ||
786 | static uschar *csa_reason_string[] = { | |
787 | US"unknown", | |
788 | US"ok", | |
789 | US"deferred (SRV lookup failed)", | |
790 | US"deferred (target address lookup failed)", | |
791 | US"failed (explicit authorization required)", | |
792 | US"failed (host name not authorized)", | |
793 | US"failed (no authorized addresses)", | |
794 | US"failed (client address mismatch)" | |
795 | }; | |
796 | ||
c99ce5c9 TF |
797 | /* Options for the ratelimit condition. Note that there are two variants of |
798 | the per_rcpt option, depending on the ACL that is used to measure the rate. | |
799 | However any ACL must be able to look up per_rcpt rates in /noupdate mode, | |
800 | so the two variants must have the same internal representation as well as | |
801 | the same configuration string. */ | |
802 | ||
803 | enum { | |
804 | RATE_PER_WHAT, RATE_PER_CLASH, RATE_PER_ADDR, RATE_PER_BYTE, RATE_PER_CMD, | |
805 | RATE_PER_CONN, RATE_PER_MAIL, RATE_PER_RCPT, RATE_PER_ALLRCPTS | |
806 | }; | |
807 | ||
808 | #define RATE_SET(var,new) \ | |
809 | (((var) == RATE_PER_WHAT) ? ((var) = RATE_##new) : ((var) = RATE_PER_CLASH)) | |
810 | ||
811 | static uschar *ratelimit_option_string[] = { | |
812 | US"?", US"!", US"per_addr", US"per_byte", US"per_cmd", | |
813 | US"per_conn", US"per_mail", US"per_rcpt", US"per_rcpt" | |
814 | }; | |
815 | ||
059ec3d9 PH |
816 | /* Enable recursion between acl_check_internal() and acl_check_condition() */ |
817 | ||
55414b25 | 818 | static int acl_check_wargs(int, address_item *, const uschar *, int, uschar **, |
f60d98e8 | 819 | uschar **); |
059ec3d9 PH |
820 | |
821 | ||
822 | /************************************************* | |
823 | * Pick out name from list * | |
824 | *************************************************/ | |
825 | ||
826 | /* Use a binary chop method | |
827 | ||
828 | Arguments: | |
829 | name name to find | |
830 | list list of names | |
831 | end size of list | |
832 | ||
833 | Returns: offset in list, or -1 if not found | |
834 | */ | |
835 | ||
836 | static int | |
837 | acl_checkname(uschar *name, uschar **list, int end) | |
838 | { | |
839 | int start = 0; | |
840 | ||
841 | while (start < end) | |
842 | { | |
843 | int mid = (start + end)/2; | |
844 | int c = Ustrcmp(name, list[mid]); | |
845 | if (c == 0) return mid; | |
846 | if (c < 0) end = mid; else start = mid + 1; | |
847 | } | |
848 | ||
849 | return -1; | |
850 | } | |
851 | ||
852 | ||
853 | /************************************************* | |
854 | * Read and parse one ACL * | |
855 | *************************************************/ | |
856 | ||
857 | /* This function is called both from readconf in order to parse the ACLs in the | |
858 | configuration file, and also when an ACL is encountered dynamically (e.g. as | |
859 | the result of an expansion). It is given a function to call in order to | |
860 | retrieve the lines of the ACL. This function handles skipping comments and | |
861 | blank lines (where relevant). | |
862 | ||
863 | Arguments: | |
864 | func function to get next line of ACL | |
865 | error where to put an error message | |
866 | ||
867 | Returns: pointer to ACL, or NULL | |
868 | NULL can be legal (empty ACL); in this case error will be NULL | |
869 | */ | |
870 | ||
871 | acl_block * | |
872 | acl_read(uschar *(*func)(void), uschar **error) | |
873 | { | |
874 | acl_block *yield = NULL; | |
875 | acl_block **lastp = &yield; | |
876 | acl_block *this = NULL; | |
877 | acl_condition_block *cond; | |
878 | acl_condition_block **condp = NULL; | |
879 | uschar *s; | |
880 | ||
881 | *error = NULL; | |
882 | ||
883 | while ((s = (*func)()) != NULL) | |
884 | { | |
885 | int v, c; | |
886 | BOOL negated = FALSE; | |
887 | uschar *saveline = s; | |
888 | uschar name[64]; | |
889 | ||
890 | /* Conditions (but not verbs) are allowed to be negated by an initial | |
891 | exclamation mark. */ | |
892 | ||
893 | while (isspace(*s)) s++; | |
894 | if (*s == '!') | |
895 | { | |
896 | negated = TRUE; | |
897 | s++; | |
898 | } | |
899 | ||
cf00dad6 PH |
900 | /* Read the name of a verb or a condition, or the start of a new ACL, which |
901 | can be started by a name, or by a macro definition. */ | |
059ec3d9 PH |
902 | |
903 | s = readconf_readname(name, sizeof(name), s); | |
b8dc3e4a | 904 | if (*s == ':' || (isupper(name[0]) && *s == '=')) return yield; |
059ec3d9 PH |
905 | |
906 | /* If a verb is unrecognized, it may be another condition or modifier that | |
907 | continues the previous verb. */ | |
908 | ||
909 | v = acl_checkname(name, verbs, sizeof(verbs)/sizeof(char *)); | |
910 | if (v < 0) | |
911 | { | |
912 | if (this == NULL) | |
913 | { | |
4e167a8c PH |
914 | *error = string_sprintf("unknown ACL verb \"%s\" in \"%s\"", name, |
915 | saveline); | |
059ec3d9 PH |
916 | return NULL; |
917 | } | |
918 | } | |
919 | ||
920 | /* New verb */ | |
921 | ||
922 | else | |
923 | { | |
924 | if (negated) | |
925 | { | |
926 | *error = string_sprintf("malformed ACL line \"%s\"", saveline); | |
927 | return NULL; | |
928 | } | |
929 | this = store_get(sizeof(acl_block)); | |
930 | *lastp = this; | |
931 | lastp = &(this->next); | |
932 | this->next = NULL; | |
933 | this->verb = v; | |
934 | this->condition = NULL; | |
935 | condp = &(this->condition); | |
936 | if (*s == 0) continue; /* No condition on this line */ | |
937 | if (*s == '!') | |
938 | { | |
939 | negated = TRUE; | |
940 | s++; | |
941 | } | |
942 | s = readconf_readname(name, sizeof(name), s); /* Condition name */ | |
943 | } | |
944 | ||
945 | /* Handle a condition or modifier. */ | |
946 | ||
947 | c = acl_checkname(name, conditions, sizeof(conditions)/sizeof(char *)); | |
948 | if (c < 0) | |
949 | { | |
950 | *error = string_sprintf("unknown ACL condition/modifier in \"%s\"", | |
951 | saveline); | |
952 | return NULL; | |
953 | } | |
954 | ||
955 | /* The modifiers may not be negated */ | |
956 | ||
957 | if (negated && cond_modifiers[c]) | |
958 | { | |
959 | *error = string_sprintf("ACL error: negation is not allowed with " | |
960 | "\"%s\"", conditions[c]); | |
961 | return NULL; | |
962 | } | |
963 | ||
964 | /* ENDPASS may occur only with ACCEPT or DISCARD. */ | |
965 | ||
966 | if (c == ACLC_ENDPASS && | |
967 | this->verb != ACL_ACCEPT && | |
968 | this->verb != ACL_DISCARD) | |
969 | { | |
970 | *error = string_sprintf("ACL error: \"%s\" is not allowed with \"%s\"", | |
971 | conditions[c], verbs[this->verb]); | |
972 | return NULL; | |
973 | } | |
974 | ||
975 | cond = store_get(sizeof(acl_condition_block)); | |
976 | cond->next = NULL; | |
977 | cond->type = c; | |
978 | cond->u.negated = negated; | |
979 | ||
980 | *condp = cond; | |
981 | condp = &(cond->next); | |
982 | ||
983 | /* The "set" modifier is different in that its argument is "name=value" | |
984 | rather than just a value, and we can check the validity of the name, which | |
38a0a95f PH |
985 | gives us a variable name to insert into the data block. The original ACL |
986 | variable names were acl_c0 ... acl_c9 and acl_m0 ... acl_m9. This was | |
987 | extended to 20 of each type, but after that people successfully argued for | |
641cb756 PH |
988 | arbitrary names. In the new scheme, the names must start with acl_c or acl_m. |
989 | After that, we allow alphanumerics and underscores, but the first character | |
990 | after c or m must be a digit or an underscore. This retains backwards | |
991 | compatibility. */ | |
059ec3d9 PH |
992 | |
993 | if (c == ACLC_SET) | |
994 | { | |
47ca6d6c PH |
995 | uschar *endptr; |
996 | ||
38a0a95f PH |
997 | if (Ustrncmp(s, "acl_c", 5) != 0 && |
998 | Ustrncmp(s, "acl_m", 5) != 0) | |
47ca6d6c | 999 | { |
38a0a95f PH |
1000 | *error = string_sprintf("invalid variable name after \"set\" in ACL " |
1001 | "modifier \"set %s\" (must start \"acl_c\" or \"acl_m\")", s); | |
1002 | return NULL; | |
47ca6d6c | 1003 | } |
38a0a95f PH |
1004 | |
1005 | endptr = s + 5; | |
641cb756 PH |
1006 | if (!isdigit(*endptr) && *endptr != '_') |
1007 | { | |
1008 | *error = string_sprintf("invalid variable name after \"set\" in ACL " | |
1009 | "modifier \"set %s\" (digit or underscore must follow acl_c or acl_m)", | |
1010 | s); | |
1011 | return NULL; | |
1012 | } | |
1013 | ||
38a0a95f | 1014 | while (*endptr != 0 && *endptr != '=' && !isspace(*endptr)) |
47ca6d6c | 1015 | { |
38a0a95f PH |
1016 | if (!isalnum(*endptr) && *endptr != '_') |
1017 | { | |
1018 | *error = string_sprintf("invalid character \"%c\" in variable name " | |
1019 | "in ACL modifier \"set %s\"", *endptr, s); | |
1020 | return NULL; | |
1021 | } | |
1022 | endptr++; | |
47ca6d6c | 1023 | } |
47ca6d6c | 1024 | |
38a0a95f | 1025 | cond->u.varname = string_copyn(s + 4, endptr - s - 4); |
47ca6d6c | 1026 | s = endptr; |
059ec3d9 PH |
1027 | while (isspace(*s)) s++; |
1028 | } | |
1029 | ||
1030 | /* For "set", we are now positioned for the data. For the others, only | |
1031 | "endpass" has no data */ | |
1032 | ||
1033 | if (c != ACLC_ENDPASS) | |
1034 | { | |
1035 | if (*s++ != '=') | |
1036 | { | |
1037 | *error = string_sprintf("\"=\" missing after ACL \"%s\" %s", name, | |
1038 | cond_modifiers[c]? US"modifier" : US"condition"); | |
1039 | return NULL; | |
1040 | } | |
1041 | while (isspace(*s)) s++; | |
1042 | cond->arg = string_copy(s); | |
1043 | } | |
1044 | } | |
1045 | ||
1046 | return yield; | |
1047 | } | |
1048 | ||
1049 | ||
1050 | ||
71fafd95 PH |
1051 | /************************************************* |
1052 | * Set up added header line(s) * | |
1053 | *************************************************/ | |
1054 | ||
1055 | /* This function is called by the add_header modifier, and also from acl_warn() | |
1056 | to implement the now-deprecated way of adding header lines using "message" on a | |
1057 | "warn" verb. The argument is treated as a sequence of header lines which are | |
1058 | added to a chain, provided there isn't an identical one already there. | |
1059 | ||
1060 | Argument: string of header lines | |
1061 | Returns: nothing | |
1062 | */ | |
1063 | ||
1064 | static void | |
55414b25 | 1065 | setup_header(const uschar *hstring) |
71fafd95 | 1066 | { |
55414b25 | 1067 | const uschar *p, *q; |
71fafd95 PH |
1068 | int hlen = Ustrlen(hstring); |
1069 | ||
b1b05573 JH |
1070 | /* Ignore any leading newlines */ |
1071 | while (*hstring == '\n') hstring++, hlen--; | |
71fafd95 | 1072 | |
b1b05573 | 1073 | /* An empty string does nothing; ensure exactly one final newline. */ |
71fafd95 | 1074 | if (hlen <= 0) return; |
55414b25 JH |
1075 | if (hstring[--hlen] != '\n') |
1076 | q = string_sprintf("%s\n", hstring); | |
1077 | else if (hstring[hlen-1] == '\n') | |
1078 | { | |
1079 | uschar * s = string_copy(hstring); | |
1080 | while(s[--hlen] == '\n') | |
1081 | s[hlen+1] = '\0'; | |
1082 | q = s; | |
1083 | } | |
1084 | else | |
1085 | q = hstring; | |
71fafd95 PH |
1086 | |
1087 | /* Loop for multiple header lines, taking care about continuations */ | |
1088 | ||
55414b25 | 1089 | for (p = q; *p != 0; ) |
71fafd95 | 1090 | { |
55414b25 JH |
1091 | const uschar *s; |
1092 | uschar * hdr; | |
71fafd95 PH |
1093 | int newtype = htype_add_bot; |
1094 | header_line **hptr = &acl_added_headers; | |
1095 | ||
1096 | /* Find next header line within the string */ | |
1097 | ||
1098 | for (;;) | |
1099 | { | |
1100 | q = Ustrchr(q, '\n'); | |
1101 | if (*(++q) != ' ' && *q != '\t') break; | |
1102 | } | |
1103 | ||
1104 | /* If the line starts with a colon, interpret the instruction for where to | |
1105 | add it. This temporarily sets up a new type. */ | |
1106 | ||
1107 | if (*p == ':') | |
1108 | { | |
1109 | if (strncmpic(p, US":after_received:", 16) == 0) | |
1110 | { | |
1111 | newtype = htype_add_rec; | |
1112 | p += 16; | |
1113 | } | |
1114 | else if (strncmpic(p, US":at_start_rfc:", 14) == 0) | |
1115 | { | |
1116 | newtype = htype_add_rfc; | |
1117 | p += 14; | |
1118 | } | |
1119 | else if (strncmpic(p, US":at_start:", 10) == 0) | |
1120 | { | |
1121 | newtype = htype_add_top; | |
1122 | p += 10; | |
1123 | } | |
1124 | else if (strncmpic(p, US":at_end:", 8) == 0) | |
1125 | { | |
1126 | newtype = htype_add_bot; | |
1127 | p += 8; | |
1128 | } | |
1129 | while (*p == ' ' || *p == '\t') p++; | |
1130 | } | |
1131 | ||
1132 | /* See if this line starts with a header name, and if not, add X-ACL-Warn: | |
1133 | to the front of it. */ | |
1134 | ||
1135 | for (s = p; s < q - 1; s++) | |
1136 | { | |
1137 | if (*s == ':' || !isgraph(*s)) break; | |
1138 | } | |
1139 | ||
55414b25 JH |
1140 | hdr = string_sprintf("%s%.*s", (*s == ':')? "" : "X-ACL-Warn: ", (int) (q - p), p); |
1141 | hlen = Ustrlen(hdr); | |
71fafd95 PH |
1142 | |
1143 | /* See if this line has already been added */ | |
1144 | ||
1145 | while (*hptr != NULL) | |
1146 | { | |
55414b25 | 1147 | if (Ustrncmp((*hptr)->text, hdr, hlen) == 0) break; |
71fafd95 PH |
1148 | hptr = &((*hptr)->next); |
1149 | } | |
1150 | ||
1151 | /* Add if not previously present */ | |
1152 | ||
1153 | if (*hptr == NULL) | |
1154 | { | |
1155 | header_line *h = store_get(sizeof(header_line)); | |
55414b25 | 1156 | h->text = hdr; |
71fafd95 PH |
1157 | h->next = NULL; |
1158 | h->type = newtype; | |
1159 | h->slen = hlen; | |
1160 | *hptr = h; | |
1161 | hptr = &(h->next); | |
1162 | } | |
1163 | ||
1164 | /* Advance for next header line within the string */ | |
1165 | ||
1166 | p = q; | |
1167 | } | |
1168 | } | |
1169 | ||
1170 | ||
1171 | ||
362145b5 JH |
1172 | /************************************************* |
1173 | * List the added header lines * | |
1174 | *************************************************/ | |
1175 | uschar * | |
1176 | fn_hdrs_added(void) | |
1177 | { | |
1178 | uschar * ret = NULL; | |
1179 | header_line * h = acl_added_headers; | |
1180 | uschar * s; | |
1181 | uschar * cp; | |
1182 | int size = 0; | |
1183 | int ptr = 0; | |
1184 | ||
1185 | if (!h) return NULL; | |
1186 | ||
1187 | do | |
1188 | { | |
1189 | s = h->text; | |
1190 | while ((cp = Ustrchr(s, '\n')) != NULL) | |
1191 | { | |
1192 | if (cp[1] == '\0') break; | |
1193 | ||
1194 | /* contains embedded newline; needs doubling */ | |
1195 | ret = string_cat(ret, &size, &ptr, s, cp-s+1); | |
6d9cfc47 | 1196 | ret = string_cat(ret, &size, &ptr, US"\n", 1); |
362145b5 JH |
1197 | s = cp+1; |
1198 | } | |
1199 | /* last bit of header */ | |
1200 | ||
1201 | ret = string_cat(ret, &size, &ptr, s, cp-s+1); /* newline-sep list */ | |
1202 | } | |
6d9cfc47 | 1203 | while((h = h->next)); |
362145b5 JH |
1204 | |
1205 | ret[ptr-1] = '\0'; /* overwrite last newline */ | |
1206 | return ret; | |
1207 | } | |
1208 | ||
1209 | ||
e7568d51 TL |
1210 | /************************************************* |
1211 | * Set up removed header line(s) * | |
1212 | *************************************************/ | |
1213 | ||
1214 | /* This function is called by the remove_header modifier. The argument is | |
1215 | treated as a sequence of header names which are added to a colon separated | |
1216 | list, provided there isn't an identical one already there. | |
1217 | ||
1218 | Argument: string of header names | |
1219 | Returns: nothing | |
1220 | */ | |
1221 | ||
1222 | static void | |
55414b25 | 1223 | setup_remove_header(const uschar *hnames) |
e7568d51 TL |
1224 | { |
1225 | if (*hnames != 0) | |
55414b25 JH |
1226 | acl_removed_headers = acl_removed_headers |
1227 | ? string_sprintf("%s : %s", acl_removed_headers, hnames) | |
1228 | : string_copy(hnames); | |
e7568d51 TL |
1229 | } |
1230 | ||
1231 | ||
71fafd95 | 1232 | |
059ec3d9 PH |
1233 | /************************************************* |
1234 | * Handle warnings * | |
1235 | *************************************************/ | |
1236 | ||
1237 | /* This function is called when a WARN verb's conditions are true. It adds to | |
1238 | the message's headers, and/or writes information to the log. In each case, this | |
1239 | only happens once (per message for headers, per connection for log). | |
1240 | ||
71fafd95 PH |
1241 | ** NOTE: The header adding action using the "message" setting is historic, and |
1242 | its use is now deprecated. The new add_header modifier should be used instead. | |
1243 | ||
059ec3d9 PH |
1244 | Arguments: |
1245 | where ACL_WHERE_xxxx indicating which ACL this is | |
1246 | user_message message for adding to headers | |
1247 | log_message message for logging, if different | |
1248 | ||
1249 | Returns: nothing | |
1250 | */ | |
1251 | ||
1252 | static void | |
1253 | acl_warn(int where, uschar *user_message, uschar *log_message) | |
1254 | { | |
059ec3d9 PH |
1255 | if (log_message != NULL && log_message != user_message) |
1256 | { | |
1257 | uschar *text; | |
1258 | string_item *logged; | |
1259 | ||
1260 | text = string_sprintf("%s Warning: %s", host_and_ident(TRUE), | |
1261 | string_printing(log_message)); | |
1262 | ||
1263 | /* If a sender verification has failed, and the log message is "sender verify | |
1264 | failed", add the failure message. */ | |
1265 | ||
1266 | if (sender_verified_failed != NULL && | |
1267 | sender_verified_failed->message != NULL && | |
1268 | strcmpic(log_message, US"sender verify failed") == 0) | |
1269 | text = string_sprintf("%s: %s", text, sender_verified_failed->message); | |
1270 | ||
9c7a242c PH |
1271 | /* Search previously logged warnings. They are kept in malloc |
1272 | store so they can be freed at the start of a new message. */ | |
059ec3d9 PH |
1273 | |
1274 | for (logged = acl_warn_logged; logged != NULL; logged = logged->next) | |
1275 | if (Ustrcmp(logged->text, text) == 0) break; | |
1276 | ||
1277 | if (logged == NULL) | |
1278 | { | |
1279 | int length = Ustrlen(text) + 1; | |
1280 | log_write(0, LOG_MAIN, "%s", text); | |
1281 | logged = store_malloc(sizeof(string_item) + length); | |
1282 | logged->text = (uschar *)logged + sizeof(string_item); | |
1283 | memcpy(logged->text, text, length); | |
1284 | logged->next = acl_warn_logged; | |
1285 | acl_warn_logged = logged; | |
1286 | } | |
1287 | } | |
1288 | ||
1289 | /* If there's no user message, we are done. */ | |
1290 | ||
1291 | if (user_message == NULL) return; | |
1292 | ||
1293 | /* If this isn't a message ACL, we can't do anything with a user message. | |
1294 | Log an error. */ | |
1295 | ||
1296 | if (where > ACL_WHERE_NOTSMTP) | |
1297 | { | |
1298 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting " | |
1299 | "found in a non-message (%s) ACL: cannot specify header lines here: " | |
1300 | "message ignored", acl_wherenames[where]); | |
1301 | return; | |
1302 | } | |
1303 | ||
71fafd95 PH |
1304 | /* The code for setting up header lines is now abstracted into a separate |
1305 | function so that it can be used for the add_header modifier as well. */ | |
059ec3d9 | 1306 | |
71fafd95 | 1307 | setup_header(user_message); |
059ec3d9 PH |
1308 | } |
1309 | ||
1310 | ||
1311 | ||
1312 | /************************************************* | |
1313 | * Verify and check reverse DNS * | |
1314 | *************************************************/ | |
1315 | ||
1316 | /* Called from acl_verify() below. We look up the host name(s) of the client IP | |
1317 | address if this has not yet been done. The host_name_lookup() function checks | |
1318 | that one of these names resolves to an address list that contains the client IP | |
1319 | address, so we don't actually have to do the check here. | |
1320 | ||
1321 | Arguments: | |
1322 | user_msgptr pointer for user message | |
1323 | log_msgptr pointer for log message | |
1324 | ||
1325 | Returns: OK verification condition succeeded | |
1326 | FAIL verification failed | |
1327 | DEFER there was a problem verifying | |
1328 | */ | |
1329 | ||
1330 | static int | |
1331 | acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr) | |
1332 | { | |
1333 | int rc; | |
1334 | ||
1335 | user_msgptr = user_msgptr; /* stop compiler warning */ | |
1336 | ||
1337 | /* Previous success */ | |
1338 | ||
1339 | if (sender_host_name != NULL) return OK; | |
1340 | ||
1341 | /* Previous failure */ | |
1342 | ||
1343 | if (host_lookup_failed) | |
1344 | { | |
1345 | *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg); | |
1346 | return FAIL; | |
1347 | } | |
1348 | ||
1349 | /* Need to do a lookup */ | |
1350 | ||
1351 | HDEBUG(D_acl) | |
1352 | debug_printf("looking up host name to force name/address consistency check\n"); | |
1353 | ||
1354 | if ((rc = host_name_lookup()) != OK) | |
1355 | { | |
1356 | *log_msgptr = (rc == DEFER)? | |
1357 | US"host lookup deferred for reverse lookup check" | |
1358 | : | |
1359 | string_sprintf("host lookup failed for reverse lookup check%s", | |
1360 | host_lookup_msg); | |
1361 | return rc; /* DEFER or FAIL */ | |
1362 | } | |
1363 | ||
1364 | host_build_sender_fullhost(); | |
1365 | return OK; | |
1366 | } | |
1367 | ||
1368 | ||
1369 | ||
e5a9dba6 PH |
1370 | /************************************************* |
1371 | * Check client IP address matches CSA target * | |
1372 | *************************************************/ | |
1373 | ||
1374 | /* Called from acl_verify_csa() below. This routine scans a section of a DNS | |
1375 | response for address records belonging to the CSA target hostname. The section | |
1376 | is specified by the reset argument, either RESET_ADDITIONAL or RESET_ANSWERS. | |
1377 | If one of the addresses matches the client's IP address, then the client is | |
1378 | authorized by CSA. If there are target IP addresses but none of them match | |
1379 | then the client is using an unauthorized IP address. If there are no target IP | |
1380 | addresses then the client cannot be using an authorized IP address. (This is | |
1381 | an odd configuration - why didn't the SRV record have a weight of 1 instead?) | |
1382 | ||
1383 | Arguments: | |
1384 | dnsa the DNS answer block | |
1385 | dnss a DNS scan block for us to use | |
1386 | reset option specifing what portion to scan, as described above | |
1387 | target the target hostname to use for matching RR names | |
1388 | ||
1389 | Returns: CSA_OK successfully authorized | |
1390 | CSA_FAIL_MISMATCH addresses found but none matched | |
1391 | CSA_FAIL_NOADDR no target addresses found | |
1392 | */ | |
1393 | ||
1394 | static int | |
1395 | acl_verify_csa_address(dns_answer *dnsa, dns_scan *dnss, int reset, | |
1396 | uschar *target) | |
1397 | { | |
1398 | dns_record *rr; | |
1399 | dns_address *da; | |
1400 | ||
1401 | BOOL target_found = FALSE; | |
1402 | ||
1403 | for (rr = dns_next_rr(dnsa, dnss, reset); | |
1404 | rr != NULL; | |
1405 | rr = dns_next_rr(dnsa, dnss, RESET_NEXT)) | |
1406 | { | |
1407 | /* Check this is an address RR for the target hostname. */ | |
1408 | ||
1409 | if (rr->type != T_A | |
1410 | #if HAVE_IPV6 | |
1411 | && rr->type != T_AAAA | |
e5a9dba6 PH |
1412 | #endif |
1413 | ) continue; | |
1414 | ||
1415 | if (strcmpic(target, rr->name) != 0) continue; | |
1416 | ||
1417 | target_found = TRUE; | |
1418 | ||
1419 | /* Turn the target address RR into a list of textual IP addresses and scan | |
1420 | the list. There may be more than one if it is an A6 RR. */ | |
1421 | ||
1422 | for (da = dns_address_from_rr(dnsa, rr); da != NULL; da = da->next) | |
1423 | { | |
1424 | /* If the client IP address matches the target IP address, it's good! */ | |
1425 | ||
1426 | DEBUG(D_acl) debug_printf("CSA target address is %s\n", da->address); | |
1427 | ||
1428 | if (strcmpic(sender_host_address, da->address) == 0) return CSA_OK; | |
1429 | } | |
1430 | } | |
1431 | ||
1432 | /* If we found some target addresses but none of them matched, the client is | |
1433 | using an unauthorized IP address, otherwise the target has no authorized IP | |
1434 | addresses. */ | |
1435 | ||
1436 | if (target_found) return CSA_FAIL_MISMATCH; | |
1437 | else return CSA_FAIL_NOADDR; | |
1438 | } | |
1439 | ||
1440 | ||
1441 | ||
1442 | /************************************************* | |
1443 | * Verify Client SMTP Authorization * | |
1444 | *************************************************/ | |
1445 | ||
1446 | /* Called from acl_verify() below. This routine calls dns_lookup_special() | |
1447 | to find the CSA SRV record corresponding to the domain argument, or | |
1448 | $sender_helo_name if no argument is provided. It then checks that the | |
1449 | client is authorized, and that its IP address corresponds to the SRV | |
1450 | target's address by calling acl_verify_csa_address() above. The address | |
1451 | should have been returned in the DNS response's ADDITIONAL section, but if | |
1452 | not we perform another DNS lookup to get it. | |
1453 | ||
1454 | Arguments: | |
1455 | domain pointer to optional parameter following verify = csa | |
1456 | ||
1457 | Returns: CSA_UNKNOWN no valid CSA record found | |
1458 | CSA_OK successfully authorized | |
1459 | CSA_FAIL_* client is definitely not authorized | |
1460 | CSA_DEFER_* there was a DNS problem | |
1461 | */ | |
1462 | ||
1463 | static int | |
55414b25 | 1464 | acl_verify_csa(const uschar *domain) |
e5a9dba6 PH |
1465 | { |
1466 | tree_node *t; | |
55414b25 JH |
1467 | const uschar *found; |
1468 | uschar *p; | |
e5a9dba6 PH |
1469 | int priority, weight, port; |
1470 | dns_answer dnsa; | |
1471 | dns_scan dnss; | |
1472 | dns_record *rr; | |
1473 | int rc, type; | |
1474 | uschar target[256]; | |
1475 | ||
1476 | /* Work out the domain we are using for the CSA lookup. The default is the | |
1477 | client's HELO domain. If the client has not said HELO, use its IP address | |
1478 | instead. If it's a local client (exim -bs), CSA isn't applicable. */ | |
1479 | ||
1480 | while (isspace(*domain) && *domain != '\0') ++domain; | |
1481 | if (*domain == '\0') domain = sender_helo_name; | |
1482 | if (domain == NULL) domain = sender_host_address; | |
1483 | if (sender_host_address == NULL) return CSA_UNKNOWN; | |
1484 | ||
1485 | /* If we have an address literal, strip off the framing ready for turning it | |
1486 | into a domain. The framing consists of matched square brackets possibly | |
1487 | containing a keyword and a colon before the actual IP address. */ | |
1488 | ||
1489 | if (domain[0] == '[') | |
1490 | { | |
55414b25 | 1491 | const uschar *start = Ustrchr(domain, ':'); |
e5a9dba6 PH |
1492 | if (start == NULL) start = domain; |
1493 | domain = string_copyn(start + 1, Ustrlen(start) - 2); | |
1494 | } | |
1495 | ||
1496 | /* Turn domains that look like bare IP addresses into domains in the reverse | |
1497 | DNS. This code also deals with address literals and $sender_host_address. It's | |
1498 | not quite kosher to treat bare domains such as EHLO 192.0.2.57 the same as | |
1499 | address literals, but it's probably the most friendly thing to do. This is an | |
1500 | extension to CSA, so we allow it to be turned off for proper conformance. */ | |
1501 | ||
7e66e54d | 1502 | if (string_is_ip_address(domain, NULL) != 0) |
e5a9dba6 PH |
1503 | { |
1504 | if (!dns_csa_use_reverse) return CSA_UNKNOWN; | |
1505 | dns_build_reverse(domain, target); | |
1506 | domain = target; | |
1507 | } | |
1508 | ||
1509 | /* Find out if we've already done the CSA check for this domain. If we have, | |
1510 | return the same result again. Otherwise build a new cached result structure | |
1511 | for this domain. The name is filled in now, and the value is filled in when | |
1512 | we return from this function. */ | |
1513 | ||
1514 | t = tree_search(csa_cache, domain); | |
1515 | if (t != NULL) return t->data.val; | |
1516 | ||
1517 | t = store_get_perm(sizeof(tree_node) + Ustrlen(domain)); | |
1518 | Ustrcpy(t->name, domain); | |
1519 | (void)tree_insertnode(&csa_cache, t); | |
1520 | ||
1521 | /* Now we are ready to do the actual DNS lookup(s). */ | |
1522 | ||
28e6ef29 | 1523 | found = domain; |
e5a9dba6 PH |
1524 | switch (dns_special_lookup(&dnsa, domain, T_CSA, &found)) |
1525 | { | |
1526 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1527 | ||
1528 | default: | |
1529 | return t->data.val = CSA_DEFER_SRV; | |
1530 | ||
1531 | /* If we found nothing, the client's authorization is unknown. */ | |
1532 | ||
1533 | case DNS_NOMATCH: | |
1534 | case DNS_NODATA: | |
1535 | return t->data.val = CSA_UNKNOWN; | |
1536 | ||
1537 | /* We got something! Go on to look at the reply in more detail. */ | |
1538 | ||
1539 | case DNS_SUCCEED: | |
1540 | break; | |
1541 | } | |
1542 | ||
1543 | /* Scan the reply for well-formed CSA SRV records. */ | |
1544 | ||
1545 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
1546 | rr != NULL; | |
1547 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
1548 | { | |
1549 | if (rr->type != T_SRV) continue; | |
1550 | ||
1551 | /* Extract the numerical SRV fields (p is incremented) */ | |
1552 | ||
1553 | p = rr->data; | |
1554 | GETSHORT(priority, p); | |
1555 | GETSHORT(weight, p); | |
1556 | GETSHORT(port, p); | |
1557 | ||
1558 | DEBUG(D_acl) | |
1559 | debug_printf("CSA priority=%d weight=%d port=%d\n", priority, weight, port); | |
1560 | ||
1561 | /* Check the CSA version number */ | |
1562 | ||
1563 | if (priority != 1) continue; | |
1564 | ||
1565 | /* If the domain does not have a CSA SRV record of its own (i.e. the domain | |
1566 | found by dns_special_lookup() is a parent of the one we asked for), we check | |
1567 | the subdomain assertions in the port field. At the moment there's only one | |
1568 | assertion: legitimate SMTP clients are all explicitly authorized with CSA | |
1569 | SRV records of their own. */ | |
1570 | ||
1dc92d5a | 1571 | if (Ustrcmp(found, domain) != 0) |
e5a9dba6 PH |
1572 | { |
1573 | if (port & 1) | |
1574 | return t->data.val = CSA_FAIL_EXPLICIT; | |
1575 | else | |
1576 | return t->data.val = CSA_UNKNOWN; | |
1577 | } | |
1578 | ||
1579 | /* This CSA SRV record refers directly to our domain, so we check the value | |
1580 | in the weight field to work out the domain's authorization. 0 and 1 are | |
1581 | unauthorized; 3 means the client is authorized but we can't check the IP | |
1582 | address in order to authenticate it, so we treat it as unknown; values | |
1583 | greater than 3 are undefined. */ | |
1584 | ||
1585 | if (weight < 2) return t->data.val = CSA_FAIL_DOMAIN; | |
1586 | ||
1587 | if (weight > 2) continue; | |
1588 | ||
1589 | /* Weight == 2, which means the domain is authorized. We must check that the | |
1590 | client's IP address is listed as one of the SRV target addresses. Save the | |
1591 | target hostname then break to scan the additional data for its addresses. */ | |
1592 | ||
1593 | (void)dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, | |
1594 | (DN_EXPAND_ARG4_TYPE)target, sizeof(target)); | |
1595 | ||
1596 | DEBUG(D_acl) debug_printf("CSA target is %s\n", target); | |
1597 | ||
1598 | break; | |
1599 | } | |
1600 | ||
1601 | /* If we didn't break the loop then no appropriate records were found. */ | |
1602 | ||
1603 | if (rr == NULL) return t->data.val = CSA_UNKNOWN; | |
1604 | ||
1605 | /* Do not check addresses if the target is ".", in accordance with RFC 2782. | |
1606 | A target of "." indicates there are no valid addresses, so the client cannot | |
1607 | be authorized. (This is an odd configuration because weight=2 target=. is | |
1608 | equivalent to weight=1, but we check for it in order to keep load off the | |
1609 | root name servers.) Note that dn_expand() turns "." into "". */ | |
1610 | ||
1611 | if (Ustrcmp(target, "") == 0) return t->data.val = CSA_FAIL_NOADDR; | |
1612 | ||
1613 | /* Scan the additional section of the CSA SRV reply for addresses belonging | |
1614 | to the target. If the name server didn't return any additional data (e.g. | |
1615 | because it does not fully support SRV records), we need to do another lookup | |
1616 | to obtain the target addresses; otherwise we have a definitive result. */ | |
1617 | ||
1618 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ADDITIONAL, target); | |
1619 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1620 | ||
1621 | /* The DNS lookup type corresponds to the IP version used by the client. */ | |
1622 | ||
1623 | #if HAVE_IPV6 | |
1624 | if (Ustrchr(sender_host_address, ':') != NULL) | |
1625 | type = T_AAAA; | |
1626 | else | |
1627 | #endif /* HAVE_IPV6 */ | |
1628 | type = T_A; | |
1629 | ||
1630 | ||
4e0983dc | 1631 | lookup_dnssec_authenticated = NULL; |
e5a9dba6 PH |
1632 | switch (dns_lookup(&dnsa, target, type, NULL)) |
1633 | { | |
1634 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1635 | ||
1636 | default: | |
cc00f4af | 1637 | return t->data.val = CSA_DEFER_ADDR; |
e5a9dba6 PH |
1638 | |
1639 | /* If the query succeeded, scan the addresses and return the result. */ | |
1640 | ||
1641 | case DNS_SUCCEED: | |
cc00f4af JH |
1642 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ANSWERS, target); |
1643 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1644 | /* else fall through */ | |
e5a9dba6 PH |
1645 | |
1646 | /* If the target has no IP addresses, the client cannot have an authorized | |
1647 | IP address. However, if the target site uses A6 records (not AAAA records) | |
1648 | we have to do yet another lookup in order to check them. */ | |
1649 | ||
1650 | case DNS_NOMATCH: | |
1651 | case DNS_NODATA: | |
cc00f4af | 1652 | return t->data.val = CSA_FAIL_NOADDR; |
e5a9dba6 PH |
1653 | } |
1654 | } | |
1655 | ||
1656 | ||
1657 | ||
059ec3d9 PH |
1658 | /************************************************* |
1659 | * Handle verification (address & other) * | |
1660 | *************************************************/ | |
1661 | ||
89583014 | 1662 | enum { VERIFY_REV_HOST_LKUP, VERIFY_CERT, VERIFY_HELO, VERIFY_CSA, VERIFY_HDR_SYNTAX, |
770747fd MFM |
1663 | VERIFY_NOT_BLIND, VERIFY_HDR_SNDR, VERIFY_SNDR, VERIFY_RCPT, |
1664 | VERIFY_HDR_NAMES_ASCII | |
89583014 JH |
1665 | }; |
1666 | typedef struct { | |
1667 | uschar * name; | |
1668 | int value; | |
1669 | unsigned where_allowed; /* bitmap */ | |
1670 | BOOL no_options; /* Never has /option(s) following */ | |
1671 | unsigned alt_opt_sep; /* >0 Non-/ option separator (custom parser) */ | |
1672 | } verify_type_t; | |
1673 | static verify_type_t verify_type_list[] = { | |
7e8360e6 | 1674 | { US"reverse_host_lookup", VERIFY_REV_HOST_LKUP, ~0, FALSE, 0 }, |
89583014 JH |
1675 | { US"certificate", VERIFY_CERT, ~0, TRUE, 0 }, |
1676 | { US"helo", VERIFY_HELO, ~0, TRUE, 0 }, | |
1677 | { US"csa", VERIFY_CSA, ~0, FALSE, 0 }, | |
1678 | { US"header_syntax", VERIFY_HDR_SYNTAX, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), TRUE, 0 }, | |
1679 | { US"not_blind", VERIFY_NOT_BLIND, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), TRUE, 0 }, | |
1680 | { US"header_sender", VERIFY_HDR_SNDR, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), FALSE, 0 }, | |
1681 | { US"sender", VERIFY_SNDR, (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT) | |
1682 | |(1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), | |
1683 | FALSE, 6 }, | |
770747fd MFM |
1684 | { US"recipient", VERIFY_RCPT, (1<<ACL_WHERE_RCPT), FALSE, 0 }, |
1685 | { US"header_names_ascii", VERIFY_HDR_NAMES_ASCII, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), TRUE, 0 } | |
89583014 JH |
1686 | }; |
1687 | ||
1688 | ||
1689 | enum { CALLOUT_DEFER_OK, CALLOUT_NOCACHE, CALLOUT_RANDOM, CALLOUT_USE_SENDER, | |
1690 | CALLOUT_USE_POSTMASTER, CALLOUT_POSTMASTER, CALLOUT_FULLPOSTMASTER, | |
1691 | CALLOUT_MAILFROM, CALLOUT_POSTMASTER_MAILFROM, CALLOUT_MAXWAIT, CALLOUT_CONNECT, | |
1692 | CALLOUT_TIME | |
1693 | }; | |
1694 | typedef struct { | |
1695 | uschar * name; | |
1696 | int value; | |
1697 | int flag; | |
1698 | BOOL has_option; /* Has =option(s) following */ | |
1699 | BOOL timeval; /* Has a time value */ | |
1700 | } callout_opt_t; | |
1701 | static callout_opt_t callout_opt_list[] = { | |
1702 | { US"defer_ok", CALLOUT_DEFER_OK, 0, FALSE, FALSE }, | |
1703 | { US"no_cache", CALLOUT_NOCACHE, vopt_callout_no_cache, FALSE, FALSE }, | |
1704 | { US"random", CALLOUT_RANDOM, vopt_callout_random, FALSE, FALSE }, | |
1705 | { US"use_sender", CALLOUT_USE_SENDER, vopt_callout_recipsender, FALSE, FALSE }, | |
1706 | { US"use_postmaster", CALLOUT_USE_POSTMASTER,vopt_callout_recippmaster, FALSE, FALSE }, | |
1707 | { US"postmaster_mailfrom",CALLOUT_POSTMASTER_MAILFROM,0, TRUE, FALSE }, | |
1708 | { US"postmaster", CALLOUT_POSTMASTER, 0, FALSE, FALSE }, | |
1709 | { US"fullpostmaster", CALLOUT_FULLPOSTMASTER,vopt_callout_fullpm, FALSE, FALSE }, | |
1710 | { US"mailfrom", CALLOUT_MAILFROM, 0, TRUE, FALSE }, | |
1711 | { US"maxwait", CALLOUT_MAXWAIT, 0, TRUE, TRUE }, | |
1712 | { US"connect", CALLOUT_CONNECT, 0, TRUE, TRUE }, | |
1713 | { NULL, CALLOUT_TIME, 0, FALSE, TRUE } | |
1714 | }; | |
1715 | ||
1716 | ||
1717 | ||
059ec3d9 PH |
1718 | /* This function implements the "verify" condition. It is called when |
1719 | encountered in any ACL, because some tests are almost always permitted. Some | |
1720 | just don't make sense, and always fail (for example, an attempt to test a host | |
1721 | lookup for a non-TCP/IP message). Others are restricted to certain ACLs. | |
1722 | ||
1723 | Arguments: | |
1724 | where where called from | |
1725 | addr the recipient address that the ACL is handling, or NULL | |
1726 | arg the argument of "verify" | |
1727 | user_msgptr pointer for user message | |
1728 | log_msgptr pointer for log message | |
1729 | basic_errno where to put verify errno | |
1730 | ||
1731 | Returns: OK verification condition succeeded | |
1732 | FAIL verification failed | |
1733 | DEFER there was a problem verifying | |
1734 | ERROR syntax error | |
1735 | */ | |
1736 | ||
1737 | static int | |
55414b25 | 1738 | acl_verify(int where, address_item *addr, const uschar *arg, |
059ec3d9 PH |
1739 | uschar **user_msgptr, uschar **log_msgptr, int *basic_errno) |
1740 | { | |
1741 | int sep = '/'; | |
1742 | int callout = -1; | |
1743 | int callout_overall = -1; | |
4deaf07d | 1744 | int callout_connect = -1; |
059ec3d9 PH |
1745 | int verify_options = 0; |
1746 | int rc; | |
1747 | BOOL verify_header_sender = FALSE; | |
1748 | BOOL defer_ok = FALSE; | |
1749 | BOOL callout_defer_ok = FALSE; | |
1750 | BOOL no_details = FALSE; | |
eafd343b | 1751 | BOOL success_on_redirect = FALSE; |
059ec3d9 PH |
1752 | address_item *sender_vaddr = NULL; |
1753 | uschar *verify_sender_address = NULL; | |
1754 | uschar *pm_mailfrom = NULL; | |
1755 | uschar *se_mailfrom = NULL; | |
596875b3 PH |
1756 | |
1757 | /* Some of the verify items have slash-separated options; some do not. Diagnose | |
89583014 | 1758 | an error if options are given for items that don't expect them. |
596875b3 PH |
1759 | */ |
1760 | ||
1761 | uschar *slash = Ustrchr(arg, '/'); | |
55414b25 | 1762 | const uschar *list = arg; |
059ec3d9 | 1763 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); |
89583014 | 1764 | verify_type_t * vp; |
059ec3d9 PH |
1765 | |
1766 | if (ss == NULL) goto BAD_VERIFY; | |
1767 | ||
1768 | /* Handle name/address consistency verification in a separate function. */ | |
1769 | ||
89583014 JH |
1770 | for (vp= verify_type_list; |
1771 | (char *)vp < (char *)verify_type_list + sizeof(verify_type_list); | |
1772 | vp++ | |
1773 | ) | |
1774 | if (vp->alt_opt_sep ? strncmpic(ss, vp->name, vp->alt_opt_sep) == 0 | |
1775 | : strcmpic (ss, vp->name) == 0) | |
1776 | break; | |
1777 | if ((char *)vp >= (char *)verify_type_list + sizeof(verify_type_list)) | |
1778 | goto BAD_VERIFY; | |
1779 | ||
1780 | if (vp->no_options && slash != NULL) | |
059ec3d9 | 1781 | { |
89583014 JH |
1782 | *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" " |
1783 | "(this verify item has no options)", arg); | |
1784 | return ERROR; | |
059ec3d9 | 1785 | } |
89583014 | 1786 | if (!(vp->where_allowed & (1<<where))) |
059ec3d9 | 1787 | { |
89583014 JH |
1788 | *log_msgptr = string_sprintf("cannot verify %s in ACL for %s", vp->name, acl_wherenames[where]); |
1789 | return ERROR; | |
059ec3d9 | 1790 | } |
89583014 | 1791 | switch(vp->value) |
596875b3 | 1792 | { |
89583014 JH |
1793 | case VERIFY_REV_HOST_LKUP: |
1794 | if (sender_host_address == NULL) return OK; | |
7e8360e6 JH |
1795 | if ((rc = acl_verify_reverse(user_msgptr, log_msgptr)) == DEFER) |
1796 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) | |
1797 | if (strcmpic(ss, US"defer_ok") == 0) | |
1798 | return OK; | |
1799 | return rc; | |
059ec3d9 | 1800 | |
89583014 JH |
1801 | case VERIFY_CERT: |
1802 | /* TLS certificate verification is done at STARTTLS time; here we just | |
1803 | test whether it was successful or not. (This is for optional verification; for | |
1804 | mandatory verification, the connection doesn't last this long.) */ | |
e5a9dba6 | 1805 | |
817d9f57 | 1806 | if (tls_in.certificate_verified) return OK; |
89583014 JH |
1807 | *user_msgptr = US"no verified certificate"; |
1808 | return FAIL; | |
e5a9dba6 | 1809 | |
89583014 JH |
1810 | case VERIFY_HELO: |
1811 | /* We can test the result of optional HELO verification that might have | |
1812 | occurred earlier. If not, we can attempt the verification now. */ | |
059ec3d9 | 1813 | |
89583014 JH |
1814 | if (!helo_verified && !helo_verify_failed) smtp_verify_helo(); |
1815 | return helo_verified? OK : FAIL; | |
059ec3d9 | 1816 | |
89583014 JH |
1817 | case VERIFY_CSA: |
1818 | /* Do Client SMTP Authorization checks in a separate function, and turn the | |
1819 | result code into user-friendly strings. */ | |
1c41c9cc | 1820 | |
89583014 JH |
1821 | rc = acl_verify_csa(list); |
1822 | *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s", | |
1823 | csa_reason_string[rc]); | |
1824 | csa_status = csa_status_string[rc]; | |
1825 | DEBUG(D_acl) debug_printf("CSA result %s\n", csa_status); | |
1826 | return csa_return_code[rc]; | |
1827 | ||
1828 | case VERIFY_HDR_SYNTAX: | |
1829 | /* Check that all relevant header lines have the correct syntax. If there is | |
1830 | a syntax error, we return details of the error to the sender if configured to | |
1831 | send out full details. (But a "message" setting on the ACL can override, as | |
1832 | always). */ | |
1833 | ||
1834 | rc = verify_check_headers(log_msgptr); | |
1835 | if (rc != OK && smtp_return_error_details && *log_msgptr != NULL) | |
1c41c9cc | 1836 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); |
89583014 | 1837 | return rc; |
059ec3d9 | 1838 | |
770747fd MFM |
1839 | case VERIFY_HDR_NAMES_ASCII: |
1840 | /* Check that all header names are true 7 bit strings | |
1841 | See RFC 5322, 2.2. and RFC 6532, 3. */ | |
1842 | ||
1843 | rc = verify_check_header_names_ascii(log_msgptr); | |
1844 | if (rc != OK && smtp_return_error_details && *log_msgptr != NULL) | |
1845 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1846 | return rc; | |
1847 | ||
89583014 JH |
1848 | case VERIFY_NOT_BLIND: |
1849 | /* Check that no recipient of this message is "blind", that is, every envelope | |
1850 | recipient must be mentioned in either To: or Cc:. */ | |
059ec3d9 | 1851 | |
89583014 JH |
1852 | rc = verify_check_notblind(); |
1853 | if (rc != OK) | |
1854 | { | |
1855 | *log_msgptr = string_sprintf("bcc recipient detected"); | |
1856 | if (smtp_return_error_details) | |
1857 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1858 | } | |
1859 | return rc; | |
059ec3d9 | 1860 | |
89583014 JH |
1861 | /* The remaining verification tests check recipient and sender addresses, |
1862 | either from the envelope or from the header. There are a number of | |
1863 | slash-separated options that are common to all of them. */ | |
059ec3d9 | 1864 | |
89583014 JH |
1865 | case VERIFY_HDR_SNDR: |
1866 | verify_header_sender = TRUE; | |
1867 | break; | |
059ec3d9 | 1868 | |
89583014 JH |
1869 | case VERIFY_SNDR: |
1870 | /* In the case of a sender, this can optionally be followed by an address to use | |
1871 | in place of the actual sender (rare special-case requirement). */ | |
059ec3d9 | 1872 | { |
89583014 JH |
1873 | uschar *s = ss + 6; |
1874 | if (*s == 0) | |
1875 | verify_sender_address = sender_address; | |
1876 | else | |
1877 | { | |
1878 | while (isspace(*s)) s++; | |
1879 | if (*s++ != '=') goto BAD_VERIFY; | |
1880 | while (isspace(*s)) s++; | |
1881 | verify_sender_address = string_copy(s); | |
1882 | } | |
059ec3d9 | 1883 | } |
89583014 JH |
1884 | break; |
1885 | ||
1886 | case VERIFY_RCPT: | |
1887 | break; | |
059ec3d9 PH |
1888 | } |
1889 | ||
89583014 JH |
1890 | |
1891 | ||
596875b3 PH |
1892 | /* Remaining items are optional; they apply to sender and recipient |
1893 | verification, including "header sender" verification. */ | |
059ec3d9 PH |
1894 | |
1895 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) | |
1896 | != NULL) | |
1897 | { | |
1898 | if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE; | |
1899 | else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE; | |
eafd343b | 1900 | else if (strcmpic(ss, US"success_on_redirect") == 0) success_on_redirect = TRUE; |
059ec3d9 PH |
1901 | |
1902 | /* These two old options are left for backwards compatibility */ | |
1903 | ||
1904 | else if (strcmpic(ss, US"callout_defer_ok") == 0) | |
1905 | { | |
1906 | callout_defer_ok = TRUE; | |
1907 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1908 | } | |
1909 | ||
1910 | else if (strcmpic(ss, US"check_postmaster") == 0) | |
1911 | { | |
1912 | pm_mailfrom = US""; | |
1913 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1914 | } | |
1915 | ||
1916 | /* The callout option has a number of sub-options, comma separated */ | |
1917 | ||
1918 | else if (strncmpic(ss, US"callout", 7) == 0) | |
1919 | { | |
1920 | callout = CALLOUT_TIMEOUT_DEFAULT; | |
1921 | ss += 7; | |
1922 | if (*ss != 0) | |
1923 | { | |
1924 | while (isspace(*ss)) ss++; | |
1925 | if (*ss++ == '=') | |
1926 | { | |
55414b25 | 1927 | const uschar * sublist = ss; |
059ec3d9 PH |
1928 | int optsep = ','; |
1929 | uschar *opt; | |
1930 | uschar buffer[256]; | |
55414b25 | 1931 | while (isspace(*sublist)) sublist++; |
8e669ac1 | 1932 | |
55414b25 | 1933 | while ((opt = string_nextinlist(&sublist, &optsep, buffer, sizeof(buffer))) |
059ec3d9 PH |
1934 | != NULL) |
1935 | { | |
89583014 | 1936 | callout_opt_t * op; |
438257ba | 1937 | double period = 1.0F; |
059ec3d9 | 1938 | |
89583014 | 1939 | for (op= callout_opt_list; op->name; op++) |
438257ba | 1940 | if (strncmpic(opt, op->name, Ustrlen(op->name)) == 0) |
89583014 | 1941 | break; |
059ec3d9 | 1942 | |
89583014 JH |
1943 | verify_options |= op->flag; |
1944 | if (op->has_option) | |
1945 | { | |
438257ba | 1946 | opt += Ustrlen(op->name); |
4deaf07d PH |
1947 | while (isspace(*opt)) opt++; |
1948 | if (*opt++ != '=') | |
1949 | { | |
1950 | *log_msgptr = string_sprintf("'=' expected after " | |
89583014 | 1951 | "\"%s\" in ACL verify condition \"%s\"", op->name, arg); |
4deaf07d PH |
1952 | return ERROR; |
1953 | } | |
1954 | while (isspace(*opt)) opt++; | |
89583014 JH |
1955 | } |
1956 | if (op->timeval) | |
1957 | { | |
1958 | period = readconf_readtime(opt, 0, FALSE); | |
1959 | if (period < 0) | |
4deaf07d PH |
1960 | { |
1961 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1962 | "\"verify %s\"", arg); | |
1963 | return ERROR; | |
1964 | } | |
89583014 JH |
1965 | } |
1966 | ||
1967 | switch(op->value) | |
1968 | { | |
1969 | case CALLOUT_DEFER_OK: callout_defer_ok = TRUE; break; | |
1970 | case CALLOUT_POSTMASTER: pm_mailfrom = US""; break; | |
1971 | case CALLOUT_FULLPOSTMASTER: pm_mailfrom = US""; break; | |
1972 | case CALLOUT_MAILFROM: | |
1973 | if (!verify_header_sender) | |
1974 | { | |
1975 | *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a " | |
1976 | "callout option only for verify=header_sender (detected in ACL " | |
1977 | "condition \"%s\")", arg); | |
1978 | return ERROR; | |
1979 | } | |
1980 | se_mailfrom = string_copy(opt); | |
1981 | break; | |
1982 | case CALLOUT_POSTMASTER_MAILFROM: pm_mailfrom = string_copy(opt); break; | |
1983 | case CALLOUT_MAXWAIT: callout_overall = period; break; | |
1984 | case CALLOUT_CONNECT: callout_connect = period; break; | |
1985 | case CALLOUT_TIME: callout = period; break; | |
1986 | } | |
059ec3d9 PH |
1987 | } |
1988 | } | |
1989 | else | |
1990 | { | |
1991 | *log_msgptr = string_sprintf("'=' expected after \"callout\" in " | |
1992 | "ACL condition \"%s\"", arg); | |
1993 | return ERROR; | |
1994 | } | |
1995 | } | |
1996 | } | |
1997 | ||
1998 | /* Option not recognized */ | |
1999 | ||
2000 | else | |
2001 | { | |
2002 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " | |
2003 | "condition \"verify %s\"", ss, arg); | |
2004 | return ERROR; | |
2005 | } | |
2006 | } | |
2007 | ||
2008 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == | |
2009 | (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
2010 | { | |
2011 | *log_msgptr = US"only one of use_sender and use_postmaster can be set " | |
2012 | "for a recipient callout"; | |
2013 | return ERROR; | |
2014 | } | |
2015 | ||
2016 | /* Handle sender-in-header verification. Default the user message to the log | |
2017 | message if giving out verification details. */ | |
2018 | ||
2019 | if (verify_header_sender) | |
2020 | { | |
8e669ac1 | 2021 | int verrno; |
059ec3d9 | 2022 | rc = verify_check_header_address(user_msgptr, log_msgptr, callout, |
fe5b5d0b PH |
2023 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, verify_options, |
2024 | &verrno); | |
2025 | if (rc != OK) | |
8e669ac1 | 2026 | { |
fe5b5d0b PH |
2027 | *basic_errno = verrno; |
2028 | if (smtp_return_error_details) | |
2029 | { | |
2030 | if (*user_msgptr == NULL && *log_msgptr != NULL) | |
2031 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
2032 | if (rc == DEFER) acl_temp_details = TRUE; | |
2033 | } | |
8e669ac1 | 2034 | } |
059ec3d9 PH |
2035 | } |
2036 | ||
2037 | /* Handle a sender address. The default is to verify *the* sender address, but | |
2038 | optionally a different address can be given, for special requirements. If the | |
2039 | address is empty, we are dealing with a bounce message that has no sender, so | |
2040 | we cannot do any checking. If the real sender address gets rewritten during | |
2041 | verification (e.g. DNS widening), set the flag to stop it being rewritten again | |
2042 | during message reception. | |
2043 | ||
2044 | A list of verified "sender" addresses is kept to try to avoid doing to much | |
2045 | work repetitively when there are multiple recipients in a message and they all | |
2046 | require sender verification. However, when callouts are involved, it gets too | |
2047 | complicated because different recipients may require different callout options. | |
2048 | Therefore, we always do a full sender verify when any kind of callout is | |
2049 | specified. Caching elsewhere, for instance in the DNS resolver and in the | |
2050 | callout handling, should ensure that this is not terribly inefficient. */ | |
2051 | ||
2052 | else if (verify_sender_address != NULL) | |
2053 | { | |
2054 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
2055 | != 0) | |
2056 | { | |
2057 | *log_msgptr = US"use_sender or use_postmaster cannot be used for a " | |
2058 | "sender verify callout"; | |
2059 | return ERROR; | |
2060 | } | |
2061 | ||
2062 | sender_vaddr = verify_checked_sender(verify_sender_address); | |
2063 | if (sender_vaddr != NULL && /* Previously checked */ | |
2064 | callout <= 0) /* No callout needed this time */ | |
2065 | { | |
2066 | /* If the "routed" flag is set, it means that routing worked before, so | |
2067 | this check can give OK (the saved return code value, if set, belongs to a | |
2068 | callout that was done previously). If the "routed" flag is not set, routing | |
2069 | must have failed, so we use the saved return code. */ | |
2070 | ||
2071 | if (testflag(sender_vaddr, af_verify_routed)) rc = OK; else | |
2072 | { | |
2073 | rc = sender_vaddr->special_action; | |
2074 | *basic_errno = sender_vaddr->basic_errno; | |
2075 | } | |
2076 | HDEBUG(D_acl) debug_printf("using cached sender verify result\n"); | |
2077 | } | |
2078 | ||
2079 | /* Do a new verification, and cache the result. The cache is used to avoid | |
2080 | verifying the sender multiple times for multiple RCPTs when callouts are not | |
2081 | specified (see comments above). | |
2082 | ||
2083 | The cache is also used on failure to give details in response to the first | |
2084 | RCPT that gets bounced for this reason. However, this can be suppressed by | |
2085 | the no_details option, which sets the flag that says "this detail has already | |
2086 | been sent". The cache normally contains just one address, but there may be | |
2087 | more in esoteric circumstances. */ | |
2088 | ||
2089 | else | |
2090 | { | |
2091 | BOOL routed = TRUE; | |
2a3eea10 | 2092 | uschar *save_address_data = deliver_address_data; |
8e669ac1 | 2093 | |
059ec3d9 | 2094 | sender_vaddr = deliver_make_addr(verify_sender_address, TRUE); |
f358d5e0 | 2095 | #ifdef EXPERIMENTAL_INTERNATIONAL |
3c8b3577 JH |
2096 | if ((sender_vaddr->prop.utf8_msg = message_smtputf8)) |
2097 | { | |
2098 | sender_vaddr->prop.utf8_downcvt = message_utf8_downconvert == 1; | |
2099 | sender_vaddr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1; | |
2100 | } | |
f358d5e0 | 2101 | #endif |
059ec3d9 PH |
2102 | if (no_details) setflag(sender_vaddr, af_sverify_told); |
2103 | if (verify_sender_address[0] != 0) | |
2104 | { | |
2105 | /* If this is the real sender address, save the unrewritten version | |
2106 | for use later in receive. Otherwise, set a flag so that rewriting the | |
2107 | sender in verify_address() does not update sender_address. */ | |
2108 | ||
2109 | if (verify_sender_address == sender_address) | |
2110 | sender_address_unrewritten = sender_address; | |
2111 | else | |
2112 | verify_options |= vopt_fake_sender; | |
2113 | ||
eafd343b TK |
2114 | if (success_on_redirect) |
2115 | verify_options |= vopt_success_on_redirect; | |
2116 | ||
059ec3d9 PH |
2117 | /* The recipient, qualify, and expn options are never set in |
2118 | verify_options. */ | |
2119 | ||
2120 | rc = verify_address(sender_vaddr, NULL, verify_options, callout, | |
4deaf07d | 2121 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, &routed); |
059ec3d9 PH |
2122 | |
2123 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); | |
2124 | ||
2125 | if (rc == OK) | |
2126 | { | |
2127 | if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0) | |
2128 | { | |
2129 | DEBUG(D_acl) debug_printf("sender %s verified ok as %s\n", | |
2130 | verify_sender_address, sender_vaddr->address); | |
2131 | } | |
2132 | else | |
2133 | { | |
2134 | DEBUG(D_acl) debug_printf("sender %s verified ok\n", | |
2135 | verify_sender_address); | |
2136 | } | |
2137 | } | |
2138 | else *basic_errno = sender_vaddr->basic_errno; | |
2139 | } | |
2140 | else rc = OK; /* Null sender */ | |
2141 | ||
2142 | /* Cache the result code */ | |
2143 | ||
2144 | if (routed) setflag(sender_vaddr, af_verify_routed); | |
2145 | if (callout > 0) setflag(sender_vaddr, af_verify_callout); | |
2146 | sender_vaddr->special_action = rc; | |
2147 | sender_vaddr->next = sender_verified_list; | |
2148 | sender_verified_list = sender_vaddr; | |
8e669ac1 PH |
2149 | |
2150 | /* Restore the recipient address data, which might have been clobbered by | |
2a3eea10 | 2151 | the sender verification. */ |
8e669ac1 | 2152 | |
2a3eea10 | 2153 | deliver_address_data = save_address_data; |
059ec3d9 | 2154 | } |
8e669ac1 | 2155 | |
2a3eea10 PH |
2156 | /* Put the sender address_data value into $sender_address_data */ |
2157 | ||
d43cbe25 | 2158 | sender_address_data = sender_vaddr->prop.address_data; |
059ec3d9 PH |
2159 | } |
2160 | ||
2161 | /* A recipient address just gets a straightforward verify; again we must handle | |
2162 | the DEFER overrides. */ | |
2163 | ||
2164 | else | |
2165 | { | |
2166 | address_item addr2; | |
2167 | ||
eafd343b TK |
2168 | if (success_on_redirect) |
2169 | verify_options |= vopt_success_on_redirect; | |
2170 | ||
059ec3d9 PH |
2171 | /* We must use a copy of the address for verification, because it might |
2172 | get rewritten. */ | |
2173 | ||
2174 | addr2 = *addr; | |
2175 | rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout, | |
4deaf07d | 2176 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, NULL); |
059ec3d9 | 2177 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); |
8e669ac1 | 2178 | |
42855d71 | 2179 | *basic_errno = addr2.basic_errno; |
059ec3d9 | 2180 | *log_msgptr = addr2.message; |
8e669ac1 | 2181 | *user_msgptr = (addr2.user_message != NULL)? |
6729cf78 | 2182 | addr2.user_message : addr2.message; |
42855d71 PH |
2183 | |
2184 | /* Allow details for temporary error if the address is so flagged. */ | |
2185 | if (testflag((&addr2), af_pass_message)) acl_temp_details = TRUE; | |
059ec3d9 PH |
2186 | |
2187 | /* Make $address_data visible */ | |
d43cbe25 | 2188 | deliver_address_data = addr2.prop.address_data; |
059ec3d9 PH |
2189 | } |
2190 | ||
2191 | /* We have a result from the relevant test. Handle defer overrides first. */ | |
2192 | ||
2193 | if (rc == DEFER && (defer_ok || | |
2194 | (callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER))) | |
2195 | { | |
2196 | HDEBUG(D_acl) debug_printf("verify defer overridden by %s\n", | |
2197 | defer_ok? "defer_ok" : "callout_defer_ok"); | |
2198 | rc = OK; | |
2199 | } | |
2200 | ||
2201 | /* If we've failed a sender, set up a recipient message, and point | |
2202 | sender_verified_failed to the address item that actually failed. */ | |
2203 | ||
2204 | if (rc != OK && verify_sender_address != NULL) | |
2205 | { | |
2206 | if (rc != DEFER) | |
059ec3d9 | 2207 | *log_msgptr = *user_msgptr = US"Sender verify failed"; |
059ec3d9 | 2208 | else if (*basic_errno != ERRNO_CALLOUTDEFER) |
059ec3d9 | 2209 | *log_msgptr = *user_msgptr = US"Could not complete sender verify"; |
059ec3d9 PH |
2210 | else |
2211 | { | |
2212 | *log_msgptr = US"Could not complete sender verify callout"; | |
2213 | *user_msgptr = smtp_return_error_details? sender_vaddr->user_message : | |
2214 | *log_msgptr; | |
2215 | } | |
2216 | ||
2217 | sender_verified_failed = sender_vaddr; | |
2218 | } | |
2219 | ||
2220 | /* Verifying an address messes up the values of $domain and $local_part, | |
2221 | so reset them before returning if this is a RCPT ACL. */ | |
2222 | ||
2223 | if (addr != NULL) | |
2224 | { | |
2225 | deliver_domain = addr->domain; | |
2226 | deliver_localpart = addr->local_part; | |
2227 | } | |
2228 | return rc; | |
2229 | ||
2230 | /* Syntax errors in the verify argument come here. */ | |
2231 | ||
2232 | BAD_VERIFY: | |
2233 | *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", " | |
770747fd MFM |
2234 | "\"helo\", \"header_syntax\", \"header_sender\", \"header_names_ascii\" " |
2235 | "or \"reverse_host_lookup\" at start of ACL condition " | |
059ec3d9 PH |
2236 | "\"verify %s\"", arg); |
2237 | return ERROR; | |
2238 | } | |
2239 | ||
2240 | ||
2241 | ||
2242 | ||
2243 | /************************************************* | |
2244 | * Check argument for control= modifier * | |
2245 | *************************************************/ | |
2246 | ||
2247 | /* Called from acl_check_condition() below | |
2248 | ||
2249 | Arguments: | |
2250 | arg the argument string for control= | |
2251 | pptr set to point to the terminating character | |
2252 | where which ACL we are in | |
2253 | log_msgptr for error messages | |
2254 | ||
2255 | Returns: CONTROL_xxx value | |
2256 | */ | |
2257 | ||
2258 | static int | |
55414b25 | 2259 | decode_control(const uschar *arg, const uschar **pptr, int where, uschar **log_msgptr) |
059ec3d9 PH |
2260 | { |
2261 | int len; | |
2262 | control_def *d; | |
2263 | ||
2264 | for (d = controls_list; | |
2265 | d < controls_list + sizeof(controls_list)/sizeof(control_def); | |
2266 | d++) | |
2267 | { | |
2268 | len = Ustrlen(d->name); | |
2269 | if (Ustrncmp(d->name, arg, len) == 0) break; | |
2270 | } | |
2271 | ||
2272 | if (d >= controls_list + sizeof(controls_list)/sizeof(control_def) || | |
2273 | (arg[len] != 0 && (!d->has_option || arg[len] != '/'))) | |
2274 | { | |
2275 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2276 | return CONTROL_ERROR; | |
2277 | } | |
2278 | ||
059ec3d9 PH |
2279 | *pptr = arg + len; |
2280 | return d->value; | |
2281 | } | |
2282 | ||
2283 | ||
2284 | ||
c99ce5c9 TF |
2285 | |
2286 | /************************************************* | |
2287 | * Return a ratelimit error * | |
2288 | *************************************************/ | |
2289 | ||
2290 | /* Called from acl_ratelimit() below | |
2291 | ||
2292 | Arguments: | |
2293 | log_msgptr for error messages | |
2294 | format format string | |
2295 | ... supplementary arguments | |
2296 | ss ratelimit option name | |
2297 | where ACL_WHERE_xxxx indicating which ACL this is | |
2298 | ||
2299 | Returns: ERROR | |
2300 | */ | |
2301 | ||
2302 | static int | |
2303 | ratelimit_error(uschar **log_msgptr, const char *format, ...) | |
2304 | { | |
2305 | va_list ap; | |
2306 | uschar buffer[STRING_SPRINTF_BUFFER_SIZE]; | |
2307 | va_start(ap, format); | |
2308 | if (!string_vformat(buffer, sizeof(buffer), format, ap)) | |
2309 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
ef840681 | 2310 | "string_sprintf expansion was longer than " SIZE_T_FMT, sizeof(buffer)); |
c99ce5c9 TF |
2311 | va_end(ap); |
2312 | *log_msgptr = string_sprintf( | |
2313 | "error in arguments to \"ratelimit\" condition: %s", buffer); | |
2314 | return ERROR; | |
2315 | } | |
2316 | ||
2317 | ||
2318 | ||
2319 | ||
870f6ba8 TF |
2320 | /************************************************* |
2321 | * Handle rate limiting * | |
2322 | *************************************************/ | |
2323 | ||
2324 | /* Called by acl_check_condition() below to calculate the result | |
2325 | of the ACL ratelimit condition. | |
2326 | ||
2327 | Note that the return value might be slightly unexpected: if the | |
2328 | sender's rate is above the limit then the result is OK. This is | |
2329 | similar to the dnslists condition, and is so that you can write | |
2330 | ACL clauses like: defer ratelimit = 15 / 1h | |
2331 | ||
2332 | Arguments: | |
2333 | arg the option string for ratelimit= | |
90fc3069 | 2334 | where ACL_WHERE_xxxx indicating which ACL this is |
870f6ba8 TF |
2335 | log_msgptr for error messages |
2336 | ||
2337 | Returns: OK - Sender's rate is above limit | |
2338 | FAIL - Sender's rate is below limit | |
2339 | DEFER - Problem opening ratelimit database | |
2340 | ERROR - Syntax error in options. | |
2341 | */ | |
2342 | ||
2343 | static int | |
55414b25 | 2344 | acl_ratelimit(const uschar *arg, int where, uschar **log_msgptr) |
870f6ba8 | 2345 | { |
c99ce5c9 | 2346 | double limit, period, count; |
8f240103 PH |
2347 | uschar *ss; |
2348 | uschar *key = NULL; | |
c99ce5c9 | 2349 | uschar *unique = NULL; |
870f6ba8 | 2350 | int sep = '/'; |
c99ce5c9 TF |
2351 | BOOL leaky = FALSE, strict = FALSE, readonly = FALSE; |
2352 | BOOL noupdate = FALSE, badacl = FALSE; | |
2353 | int mode = RATE_PER_WHAT; | |
870f6ba8 TF |
2354 | int old_pool, rc; |
2355 | tree_node **anchor, *t; | |
2356 | open_db dbblock, *dbm; | |
c99ce5c9 | 2357 | int dbdb_size; |
870f6ba8 | 2358 | dbdata_ratelimit *dbd; |
c99ce5c9 | 2359 | dbdata_ratelimit_unique *dbdb; |
870f6ba8 TF |
2360 | struct timeval tv; |
2361 | ||
2362 | /* Parse the first two options and record their values in expansion | |
2363 | variables. These variables allow the configuration to have informative | |
2364 | error messages based on rate limits obtained from a table lookup. */ | |
2365 | ||
c99ce5c9 | 2366 | /* First is the maximum number of messages per period / maximum burst |
870f6ba8 TF |
2367 | size, which must be greater than or equal to zero. Zero is useful for |
2368 | rate measurement as opposed to rate limiting. */ | |
2369 | ||
2370 | sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0); | |
2371 | if (sender_rate_limit == NULL) | |
288644dd | 2372 | { |
870f6ba8 | 2373 | limit = -1.0; |
288644dd JH |
2374 | ss = NULL; /* compiler quietening */ |
2375 | } | |
870f6ba8 TF |
2376 | else |
2377 | { | |
2378 | limit = Ustrtod(sender_rate_limit, &ss); | |
2379 | if (tolower(*ss) == 'k') { limit *= 1024.0; ss++; } | |
2380 | else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; } | |
2381 | else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; } | |
2382 | } | |
c99ce5c9 TF |
2383 | if (limit < 0.0 || *ss != '\0') |
2384 | return ratelimit_error(log_msgptr, | |
2385 | "\"%s\" is not a positive number", sender_rate_limit); | |
870f6ba8 | 2386 | |
c99ce5c9 | 2387 | /* Second is the rate measurement period / exponential smoothing time |
870f6ba8 TF |
2388 | constant. This must be strictly greater than zero, because zero leads to |
2389 | run-time division errors. */ | |
2390 | ||
2391 | sender_rate_period = string_nextinlist(&arg, &sep, NULL, 0); | |
2392 | if (sender_rate_period == NULL) period = -1.0; | |
2393 | else period = readconf_readtime(sender_rate_period, 0, FALSE); | |
2394 | if (period <= 0.0) | |
c99ce5c9 TF |
2395 | return ratelimit_error(log_msgptr, |
2396 | "\"%s\" is not a time value", sender_rate_period); | |
2397 | ||
2398 | /* By default we are counting one of something, but the per_rcpt, | |
2399 | per_byte, and count options can change this. */ | |
2400 | ||
2401 | count = 1.0; | |
870f6ba8 | 2402 | |
c99ce5c9 | 2403 | /* Parse the other options. */ |
870f6ba8 TF |
2404 | |
2405 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2406 | != NULL) | |
2407 | { | |
2408 | if (strcmpic(ss, US"leaky") == 0) leaky = TRUE; | |
2409 | else if (strcmpic(ss, US"strict") == 0) strict = TRUE; | |
8f240103 | 2410 | else if (strcmpic(ss, US"noupdate") == 0) noupdate = TRUE; |
c99ce5c9 TF |
2411 | else if (strcmpic(ss, US"readonly") == 0) readonly = TRUE; |
2412 | else if (strcmpic(ss, US"per_cmd") == 0) RATE_SET(mode, PER_CMD); | |
2413 | else if (strcmpic(ss, US"per_conn") == 0) | |
2414 | { | |
2415 | RATE_SET(mode, PER_CONN); | |
2416 | if (where == ACL_WHERE_NOTSMTP || where == ACL_WHERE_NOTSMTP_START) | |
2417 | badacl = TRUE; | |
2418 | } | |
2419 | else if (strcmpic(ss, US"per_mail") == 0) | |
2420 | { | |
2421 | RATE_SET(mode, PER_MAIL); | |
2422 | if (where > ACL_WHERE_NOTSMTP) badacl = TRUE; | |
2423 | } | |
2424 | else if (strcmpic(ss, US"per_rcpt") == 0) | |
2425 | { | |
2426 | /* If we are running in the RCPT ACL, then we'll count the recipients | |
2427 | one by one, but if we are running when we have accumulated the whole | |
2428 | list then we'll add them all in one batch. */ | |
2429 | if (where == ACL_WHERE_RCPT) | |
2430 | RATE_SET(mode, PER_RCPT); | |
2431 | else if (where >= ACL_WHERE_PREDATA && where <= ACL_WHERE_NOTSMTP) | |
2432 | RATE_SET(mode, PER_ALLRCPTS), count = (double)recipients_count; | |
2433 | else if (where == ACL_WHERE_MAIL || where > ACL_WHERE_NOTSMTP) | |
2434 | RATE_SET(mode, PER_RCPT), badacl = TRUE; | |
2435 | } | |
2436 | else if (strcmpic(ss, US"per_byte") == 0) | |
2437 | { | |
2438 | /* If we have not yet received the message data and there was no SIZE | |
2439 | declaration on the MAIL comand, then it's safe to just use a value of | |
2440 | zero and let the recorded rate decay as if nothing happened. */ | |
2441 | RATE_SET(mode, PER_MAIL); | |
2442 | if (where > ACL_WHERE_NOTSMTP) badacl = TRUE; | |
2443 | else count = message_size < 0 ? 0.0 : (double)message_size; | |
2444 | } | |
2445 | else if (strcmpic(ss, US"per_addr") == 0) | |
2446 | { | |
2447 | RATE_SET(mode, PER_RCPT); | |
438257ba | 2448 | if (where != ACL_WHERE_RCPT) badacl = TRUE, unique = US"*"; |
c99ce5c9 TF |
2449 | else unique = string_sprintf("%s@%s", deliver_localpart, deliver_domain); |
2450 | } | |
2451 | else if (strncmpic(ss, US"count=", 6) == 0) | |
2452 | { | |
2453 | uschar *e; | |
2454 | count = Ustrtod(ss+6, &e); | |
2455 | if (count < 0.0 || *e != '\0') | |
2456 | return ratelimit_error(log_msgptr, | |
2457 | "\"%s\" is not a positive number", ss); | |
2458 | } | |
2459 | else if (strncmpic(ss, US"unique=", 7) == 0) | |
2460 | unique = string_copy(ss + 7); | |
2461 | else if (key == NULL) | |
2462 | key = string_copy(ss); | |
2463 | else | |
2464 | key = string_sprintf("%s/%s", key, ss); | |
870f6ba8 TF |
2465 | } |
2466 | ||
c99ce5c9 TF |
2467 | /* Sanity check. When the badacl flag is set the update mode must either |
2468 | be readonly (which is the default if it is omitted) or, for backwards | |
2469 | compatibility, a combination of noupdate and strict or leaky. */ | |
2470 | ||
2471 | if (mode == RATE_PER_CLASH) | |
2472 | return ratelimit_error(log_msgptr, "conflicting per_* options"); | |
2473 | if (leaky + strict + readonly > 1) | |
2474 | return ratelimit_error(log_msgptr, "conflicting update modes"); | |
2475 | if (badacl && (leaky || strict) && !noupdate) | |
2476 | return ratelimit_error(log_msgptr, | |
2477 | "\"%s\" must not have /leaky or /strict option in %s ACL", | |
2478 | ratelimit_option_string[mode], acl_wherenames[where]); | |
2479 | ||
2480 | /* Set the default values of any unset options. In readonly mode we | |
2481 | perform the rate computation without any increment so that its value | |
2482 | decays to eventually allow over-limit senders through. */ | |
2483 | ||
2484 | if (noupdate) readonly = TRUE, leaky = strict = FALSE; | |
2485 | if (badacl) readonly = TRUE; | |
2486 | if (readonly) count = 0.0; | |
2487 | if (!strict && !readonly) leaky = TRUE; | |
2488 | if (mode == RATE_PER_WHAT) mode = RATE_PER_MAIL; | |
870f6ba8 | 2489 | |
8f240103 PH |
2490 | /* Create the lookup key. If there is no explicit key, use sender_host_address. |
2491 | If there is no sender_host_address (e.g. -bs or acl_not_smtp) then we simply | |
2492 | omit it. The smoothing constant (sender_rate_period) and the per_xxx options | |
2493 | are added to the key because they alter the meaning of the stored data. */ | |
2494 | ||
2495 | if (key == NULL) | |
2496 | key = (sender_host_address == NULL)? US"" : sender_host_address; | |
870f6ba8 | 2497 | |
c99ce5c9 | 2498 | key = string_sprintf("%s/%s/%s%s", |
8f240103 | 2499 | sender_rate_period, |
c99ce5c9 TF |
2500 | ratelimit_option_string[mode], |
2501 | unique == NULL ? "" : "unique/", | |
8f240103 | 2502 | key); |
870f6ba8 | 2503 | |
c99ce5c9 TF |
2504 | HDEBUG(D_acl) |
2505 | debug_printf("ratelimit condition count=%.0f %.1f/%s\n", count, limit, key); | |
870f6ba8 | 2506 | |
8f240103 PH |
2507 | /* See if we have already computed the rate by looking in the relevant tree. |
2508 | For per-connection rate limiting, store tree nodes and dbdata in the permanent | |
c99ce5c9 TF |
2509 | pool so that they survive across resets. In readonly mode we only remember the |
2510 | result for the rest of this command in case a later command changes it. After | |
2511 | this bit of logic the code is independent of the per_* mode. */ | |
870f6ba8 | 2512 | |
870f6ba8 TF |
2513 | old_pool = store_pool; |
2514 | ||
c99ce5c9 TF |
2515 | if (readonly) |
2516 | anchor = &ratelimiters_cmd; | |
2517 | else switch(mode) { | |
2518 | case RATE_PER_CONN: | |
870f6ba8 TF |
2519 | anchor = &ratelimiters_conn; |
2520 | store_pool = POOL_PERM; | |
c99ce5c9 TF |
2521 | break; |
2522 | case RATE_PER_BYTE: | |
2523 | case RATE_PER_MAIL: | |
2524 | case RATE_PER_ALLRCPTS: | |
870f6ba8 | 2525 | anchor = &ratelimiters_mail; |
c99ce5c9 TF |
2526 | break; |
2527 | case RATE_PER_ADDR: | |
2528 | case RATE_PER_CMD: | |
2529 | case RATE_PER_RCPT: | |
fe0dab11 | 2530 | anchor = &ratelimiters_cmd; |
c99ce5c9 TF |
2531 | break; |
2532 | default: | |
3399bb60 | 2533 | anchor = NULL; /* silence an "unused" complaint */ |
c99ce5c9 TF |
2534 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, |
2535 | "internal ACL error: unknown ratelimit mode %d", mode); | |
2536 | break; | |
2537 | } | |
870f6ba8 | 2538 | |
c99ce5c9 TF |
2539 | t = tree_search(*anchor, key); |
2540 | if (t != NULL) | |
870f6ba8 TF |
2541 | { |
2542 | dbd = t->data.ptr; | |
2543 | /* The following few lines duplicate some of the code below. */ | |
8f240103 | 2544 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2545 | store_pool = old_pool; |
2546 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2547 | HDEBUG(D_acl) | |
2548 | debug_printf("ratelimit found pre-computed rate %s\n", sender_rate); | |
2549 | return rc; | |
2550 | } | |
2551 | ||
c99ce5c9 TF |
2552 | /* We aren't using a pre-computed rate, so get a previously recorded rate |
2553 | from the database, which will be updated and written back if required. */ | |
870f6ba8 TF |
2554 | |
2555 | dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE); | |
2556 | if (dbm == NULL) | |
2557 | { | |
2558 | store_pool = old_pool; | |
2559 | sender_rate = NULL; | |
2560 | HDEBUG(D_acl) debug_printf("ratelimit database not available\n"); | |
2561 | *log_msgptr = US"ratelimit database not available"; | |
2562 | return DEFER; | |
2563 | } | |
c99ce5c9 TF |
2564 | dbdb = dbfn_read_with_length(dbm, key, &dbdb_size); |
2565 | dbd = NULL; | |
870f6ba8 TF |
2566 | |
2567 | gettimeofday(&tv, NULL); | |
2568 | ||
c99ce5c9 TF |
2569 | if (dbdb != NULL) |
2570 | { | |
2571 | /* Locate the basic ratelimit block inside the DB data. */ | |
2572 | HDEBUG(D_acl) debug_printf("ratelimit found key in database\n"); | |
2573 | dbd = &dbdb->dbd; | |
2574 | ||
2575 | /* Forget the old Bloom filter if it is too old, so that we count each | |
2576 | repeating event once per period. We don't simply clear and re-use the old | |
2577 | filter because we want its size to change if the limit changes. Note that | |
2578 | we keep the dbd pointer for copying the rate into the new data block. */ | |
2579 | ||
2580 | if(unique != NULL && tv.tv_sec > dbdb->bloom_epoch + period) | |
2581 | { | |
2582 | HDEBUG(D_acl) debug_printf("ratelimit discarding old Bloom filter\n"); | |
2583 | dbdb = NULL; | |
2584 | } | |
2585 | ||
2586 | /* Sanity check. */ | |
2587 | ||
2588 | if(unique != NULL && dbdb_size < sizeof(*dbdb)) | |
2589 | { | |
2590 | HDEBUG(D_acl) debug_printf("ratelimit discarding undersize Bloom filter\n"); | |
2591 | dbdb = NULL; | |
2592 | } | |
2593 | } | |
2594 | ||
2595 | /* Allocate a new data block if the database lookup failed | |
2596 | or the Bloom filter passed its age limit. */ | |
2597 | ||
2598 | if (dbdb == NULL) | |
2599 | { | |
2600 | if (unique == NULL) | |
2601 | { | |
2602 | /* No Bloom filter. This basic ratelimit block is initialized below. */ | |
2603 | HDEBUG(D_acl) debug_printf("ratelimit creating new rate data block\n"); | |
2604 | dbdb_size = sizeof(*dbd); | |
2605 | dbdb = store_get(dbdb_size); | |
2606 | } | |
2607 | else | |
2608 | { | |
2609 | int extra; | |
2610 | HDEBUG(D_acl) debug_printf("ratelimit creating new Bloom filter\n"); | |
2611 | ||
2612 | /* See the long comment below for an explanation of the magic number 2. | |
2613 | The filter has a minimum size in case the rate limit is very small; | |
2614 | this is determined by the definition of dbdata_ratelimit_unique. */ | |
2615 | ||
2616 | extra = (int)limit * 2 - sizeof(dbdb->bloom); | |
2617 | if (extra < 0) extra = 0; | |
2618 | dbdb_size = sizeof(*dbdb) + extra; | |
2619 | dbdb = store_get(dbdb_size); | |
2620 | dbdb->bloom_epoch = tv.tv_sec; | |
2621 | dbdb->bloom_size = sizeof(dbdb->bloom) + extra; | |
2622 | memset(dbdb->bloom, 0, dbdb->bloom_size); | |
2623 | ||
2624 | /* Preserve any basic ratelimit data (which is our longer-term memory) | |
2625 | by copying it from the discarded block. */ | |
2626 | ||
2627 | if (dbd != NULL) | |
2628 | { | |
2629 | dbdb->dbd = *dbd; | |
2630 | dbd = &dbdb->dbd; | |
2631 | } | |
2632 | } | |
2633 | } | |
2634 | ||
2635 | /* If we are counting unique events, find out if this event is new or not. | |
2636 | If the client repeats the event during the current period then it should be | |
2637 | counted. We skip this code in readonly mode for efficiency, because any | |
2638 | changes to the filter will be discarded and because count is already set to | |
2639 | zero. */ | |
2640 | ||
2641 | if (unique != NULL && !readonly) | |
2642 | { | |
2643 | /* We identify unique events using a Bloom filter. (You can find my | |
2644 | notes on Bloom filters at http://fanf.livejournal.com/81696.html) | |
2645 | With the per_addr option, an "event" is a recipient address, though the | |
2646 | user can use the unique option to define their own events. We only count | |
2647 | an event if we have not seen it before. | |
2648 | ||
2649 | We size the filter according to the rate limit, which (in leaky mode) | |
2650 | is the limit on the population of the filter. We allow 16 bits of space | |
2651 | per entry (see the construction code above) and we set (up to) 8 of them | |
2652 | when inserting an element (see the loop below). The probability of a false | |
2653 | positive (an event we have not seen before but which we fail to count) is | |
2654 | ||
2655 | size = limit * 16 | |
2656 | numhash = 8 | |
2657 | allzero = exp(-numhash * pop / size) | |
2658 | = exp(-0.5 * pop / limit) | |
2659 | fpr = pow(1 - allzero, numhash) | |
2660 | ||
2661 | For senders at the limit the fpr is 0.06% or 1 in 1700 | |
2662 | and for senders at half the limit it is 0.0006% or 1 in 170000 | |
2663 | ||
2664 | In strict mode the Bloom filter can fill up beyond the normal limit, in | |
2665 | which case the false positive rate will rise. This means that the | |
2666 | measured rate for very fast senders can bogusly drop off after a while. | |
2667 | ||
2668 | At twice the limit, the fpr is 2.5% or 1 in 40 | |
2669 | At four times the limit, it is 31% or 1 in 3.2 | |
2670 | ||
2671 | It takes ln(pop/limit) periods for an over-limit burst of pop events to | |
2672 | decay below the limit, and if this is more than one then the Bloom filter | |
2673 | will be discarded before the decay gets that far. The false positive rate | |
2674 | at this threshold is 9.3% or 1 in 10.7. */ | |
2675 | ||
2676 | BOOL seen; | |
2677 | unsigned n, hash, hinc; | |
2678 | uschar md5sum[16]; | |
2679 | md5 md5info; | |
2680 | ||
2681 | /* Instead of using eight independent hash values, we combine two values | |
2682 | using the formula h1 + n * h2. This does not harm the Bloom filter's | |
2683 | performance, and means the amount of hash we need is independent of the | |
2684 | number of bits we set in the filter. */ | |
2685 | ||
2686 | md5_start(&md5info); | |
2687 | md5_end(&md5info, unique, Ustrlen(unique), md5sum); | |
2688 | hash = md5sum[0] | md5sum[1] << 8 | md5sum[2] << 16 | md5sum[3] << 24; | |
2689 | hinc = md5sum[4] | md5sum[5] << 8 | md5sum[6] << 16 | md5sum[7] << 24; | |
2690 | ||
2691 | /* Scan the bits corresponding to this event. A zero bit means we have | |
2692 | not seen it before. Ensure all bits are set to record this event. */ | |
2693 | ||
2694 | HDEBUG(D_acl) debug_printf("ratelimit checking uniqueness of %s\n", unique); | |
2695 | ||
2696 | seen = TRUE; | |
2697 | for (n = 0; n < 8; n++, hash += hinc) | |
2698 | { | |
2699 | int bit = 1 << (hash % 8); | |
2700 | int byte = (hash / 8) % dbdb->bloom_size; | |
2701 | if ((dbdb->bloom[byte] & bit) == 0) | |
2702 | { | |
2703 | dbdb->bloom[byte] |= bit; | |
2704 | seen = FALSE; | |
2705 | } | |
2706 | } | |
2707 | ||
2708 | /* If this event has occurred before, do not count it. */ | |
2709 | ||
2710 | if (seen) | |
2711 | { | |
2712 | HDEBUG(D_acl) debug_printf("ratelimit event found in Bloom filter\n"); | |
2713 | count = 0.0; | |
2714 | } | |
2715 | else | |
2716 | HDEBUG(D_acl) debug_printf("ratelimit event added to Bloom filter\n"); | |
2717 | } | |
2718 | ||
2719 | /* If there was no previous ratelimit data block for this key, initialize | |
2720 | the new one, otherwise update the block from the database. The initial rate | |
2721 | is what would be computed by the code below for an infinite interval. */ | |
2722 | ||
870f6ba8 TF |
2723 | if (dbd == NULL) |
2724 | { | |
c99ce5c9 TF |
2725 | HDEBUG(D_acl) debug_printf("ratelimit initializing new key's rate data\n"); |
2726 | dbd = &dbdb->dbd; | |
870f6ba8 TF |
2727 | dbd->time_stamp = tv.tv_sec; |
2728 | dbd->time_usec = tv.tv_usec; | |
c99ce5c9 | 2729 | dbd->rate = count; |
870f6ba8 TF |
2730 | } |
2731 | else | |
2732 | { | |
2733 | /* The smoothed rate is computed using an exponentially weighted moving | |
2734 | average adjusted for variable sampling intervals. The standard EWMA for | |
2735 | a fixed sampling interval is: f'(t) = (1 - a) * f(t) + a * f'(t - 1) | |
2736 | where f() is the measured value and f'() is the smoothed value. | |
2737 | ||
2738 | Old data decays out of the smoothed value exponentially, such that data n | |
2739 | samples old is multiplied by a^n. The exponential decay time constant p | |
2740 | is defined such that data p samples old is multiplied by 1/e, which means | |
2741 | that a = exp(-1/p). We can maintain the same time constant for a variable | |
2742 | sampling interval i by using a = exp(-i/p). | |
2743 | ||
2744 | The rate we are measuring is messages per period, suitable for directly | |
2745 | comparing with the limit. The average rate between now and the previous | |
2746 | message is period / interval, which we feed into the EWMA as the sample. | |
2747 | ||
2748 | It turns out that the number of messages required for the smoothed rate | |
2749 | to reach the limit when they are sent in a burst is equal to the limit. | |
2750 | This can be seen by analysing the value of the smoothed rate after N | |
2751 | messages sent at even intervals. Let k = (1 - a) * p/i | |
2752 | ||
2753 | rate_1 = (1 - a) * p/i + a * rate_0 | |
2754 | = k + a * rate_0 | |
2755 | rate_2 = k + a * rate_1 | |
2756 | = k + a * k + a^2 * rate_0 | |
2757 | rate_3 = k + a * k + a^2 * k + a^3 * rate_0 | |
2758 | rate_N = rate_0 * a^N + k * SUM(x=0..N-1)(a^x) | |
2759 | = rate_0 * a^N + k * (1 - a^N) / (1 - a) | |
2760 | = rate_0 * a^N + p/i * (1 - a^N) | |
2761 | ||
2762 | When N is large, a^N -> 0 so rate_N -> p/i as desired. | |
2763 | ||
2764 | rate_N = p/i + (rate_0 - p/i) * a^N | |
2765 | a^N = (rate_N - p/i) / (rate_0 - p/i) | |
2766 | N * -i/p = log((rate_N - p/i) / (rate_0 - p/i)) | |
2767 | N = p/i * log((rate_0 - p/i) / (rate_N - p/i)) | |
2768 | ||
2769 | Numerical analysis of the above equation, setting the computed rate to | |
2770 | increase from rate_0 = 0 to rate_N = limit, shows that for large sending | |
2771 | rates, p/i, the number of messages N = limit. So limit serves as both the | |
2772 | maximum rate measured in messages per period, and the maximum number of | |
2773 | messages that can be sent in a fast burst. */ | |
2774 | ||
2775 | double this_time = (double)tv.tv_sec | |
2776 | + (double)tv.tv_usec / 1000000.0; | |
2777 | double prev_time = (double)dbd->time_stamp | |
2778 | + (double)dbd->time_usec / 1000000.0; | |
870f6ba8 TF |
2779 | |
2780 | /* We must avoid division by zero, and deal gracefully with the clock going | |
2781 | backwards. If we blunder ahead when time is in reverse then the computed | |
e5d5a95f | 2782 | rate will be bogus. To be safe we clamp interval to a very small number. */ |
870f6ba8 | 2783 | |
e5d5a95f TF |
2784 | double interval = this_time - prev_time <= 0.0 ? 1e-9 |
2785 | : this_time - prev_time; | |
2786 | ||
2787 | double i_over_p = interval / period; | |
2788 | double a = exp(-i_over_p); | |
870f6ba8 | 2789 | |
c99ce5c9 TF |
2790 | /* Combine the instantaneous rate (period / interval) with the previous rate |
2791 | using the smoothing factor a. In order to measure sized events, multiply the | |
2792 | instantaneous rate by the count of bytes or recipients etc. */ | |
2793 | ||
870f6ba8 TF |
2794 | dbd->time_stamp = tv.tv_sec; |
2795 | dbd->time_usec = tv.tv_usec; | |
c99ce5c9 TF |
2796 | dbd->rate = (1 - a) * count / i_over_p + a * dbd->rate; |
2797 | ||
2798 | /* When events are very widely spaced the computed rate tends towards zero. | |
2799 | Although this is accurate it turns out not to be useful for our purposes, | |
2800 | especially when the first event after a long silence is the start of a spam | |
2801 | run. A more useful model is that the rate for an isolated event should be the | |
2802 | size of the event per the period size, ignoring the lack of events outside | |
2803 | the current period and regardless of where the event falls in the period. So, | |
2804 | if the interval was so long that the calculated rate is unhelpfully small, we | |
2805 | re-intialize the rate. In the absence of higher-rate bursts, the condition | |
2806 | below is true if the interval is greater than the period. */ | |
2807 | ||
2808 | if (dbd->rate < count) dbd->rate = count; | |
870f6ba8 TF |
2809 | } |
2810 | ||
c99ce5c9 TF |
2811 | /* Clients sending at the limit are considered to be over the limit. |
2812 | This matters for edge cases such as a limit of zero, when the client | |
2813 | should be completely blocked. */ | |
3348576f | 2814 | |
8f240103 | 2815 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2816 | |
2817 | /* Update the state if the rate is low or if we are being strict. If we | |
2818 | are in leaky mode and the sender's rate is too high, we do not update | |
2819 | the recorded rate in order to avoid an over-aggressive sender's retry | |
c99ce5c9 TF |
2820 | rate preventing them from getting any email through. If readonly is set, |
2821 | neither leaky nor strict are set, so we do not do any updates. */ | |
870f6ba8 | 2822 | |
c99ce5c9 | 2823 | if ((rc == FAIL && leaky) || strict) |
8f240103 | 2824 | { |
c99ce5c9 | 2825 | dbfn_write(dbm, key, dbdb, dbdb_size); |
8f240103 PH |
2826 | HDEBUG(D_acl) debug_printf("ratelimit db updated\n"); |
2827 | } | |
2828 | else | |
2829 | { | |
2830 | HDEBUG(D_acl) debug_printf("ratelimit db not updated: %s\n", | |
c99ce5c9 | 2831 | readonly? "readonly mode" : "over the limit, but leaky"); |
8f240103 PH |
2832 | } |
2833 | ||
870f6ba8 TF |
2834 | dbfn_close(dbm); |
2835 | ||
c99ce5c9 | 2836 | /* Store the result in the tree for future reference. */ |
870f6ba8 | 2837 | |
c99ce5c9 TF |
2838 | t = store_get(sizeof(tree_node) + Ustrlen(key)); |
2839 | t->data.ptr = dbd; | |
2840 | Ustrcpy(t->name, key); | |
2841 | (void)tree_insertnode(anchor, t); | |
870f6ba8 TF |
2842 | |
2843 | /* We create the formatted version of the sender's rate very late in | |
2844 | order to ensure that it is done using the correct storage pool. */ | |
2845 | ||
2846 | store_pool = old_pool; | |
2847 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2848 | ||
2849 | HDEBUG(D_acl) | |
2850 | debug_printf("ratelimit computed rate %s\n", sender_rate); | |
2851 | ||
2852 | return rc; | |
2853 | } | |
2854 | ||
2855 | ||
2856 | ||
b0019c78 TF |
2857 | /************************************************* |
2858 | * The udpsend ACL modifier * | |
2859 | *************************************************/ | |
2860 | ||
2861 | /* Called by acl_check_condition() below. | |
2862 | ||
2863 | Arguments: | |
2864 | arg the option string for udpsend= | |
2865 | log_msgptr for error messages | |
2866 | ||
2867 | Returns: OK - Completed. | |
2868 | DEFER - Problem with DNS lookup. | |
2869 | ERROR - Syntax error in options. | |
2870 | */ | |
2871 | ||
2872 | static int | |
55414b25 | 2873 | acl_udpsend(const uschar *arg, uschar **log_msgptr) |
b0019c78 TF |
2874 | { |
2875 | int sep = 0; | |
2876 | uschar *hostname; | |
2877 | uschar *portstr; | |
2878 | uschar *portend; | |
2879 | host_item *h; | |
2880 | int portnum; | |
b0019c78 TF |
2881 | int len; |
2882 | int r, s; | |
b1f8e4f8 | 2883 | uschar * errstr; |
b0019c78 TF |
2884 | |
2885 | hostname = string_nextinlist(&arg, &sep, NULL, 0); | |
2886 | portstr = string_nextinlist(&arg, &sep, NULL, 0); | |
2887 | ||
2888 | if (hostname == NULL) | |
2889 | { | |
217b0e56 | 2890 | *log_msgptr = US"missing destination host in \"udpsend\" modifier"; |
b0019c78 TF |
2891 | return ERROR; |
2892 | } | |
2893 | if (portstr == NULL) | |
2894 | { | |
217b0e56 | 2895 | *log_msgptr = US"missing destination port in \"udpsend\" modifier"; |
b0019c78 TF |
2896 | return ERROR; |
2897 | } | |
2898 | if (arg == NULL) | |
2899 | { | |
217b0e56 | 2900 | *log_msgptr = US"missing datagram payload in \"udpsend\" modifier"; |
b0019c78 TF |
2901 | return ERROR; |
2902 | } | |
2903 | portnum = Ustrtol(portstr, &portend, 10); | |
2904 | if (*portend != '\0') | |
2905 | { | |
217b0e56 | 2906 | *log_msgptr = US"bad destination port in \"udpsend\" modifier"; |
b0019c78 TF |
2907 | return ERROR; |
2908 | } | |
2909 | ||
2910 | /* Make a single-item host list. */ | |
2911 | h = store_get(sizeof(host_item)); | |
2912 | memset(h, 0, sizeof(host_item)); | |
2913 | h->name = hostname; | |
2914 | h->port = portnum; | |
2915 | h->mx = MX_NONE; | |
2916 | ||
2917 | if (string_is_ip_address(hostname, NULL)) | |
2918 | h->address = hostname, r = HOST_FOUND; | |
2919 | else | |
2920 | r = host_find_byname(h, NULL, 0, NULL, FALSE); | |
2921 | if (r == HOST_FIND_FAILED || r == HOST_FIND_AGAIN) | |
2922 | { | |
217b0e56 | 2923 | *log_msgptr = US"DNS lookup failed in \"udpsend\" modifier"; |
b0019c78 TF |
2924 | return DEFER; |
2925 | } | |
2926 | ||
2927 | HDEBUG(D_acl) | |
2928 | debug_printf("udpsend [%s]:%d %s\n", h->address, portnum, arg); | |
2929 | ||
b1f8e4f8 JH |
2930 | r = s = ip_connectedsocket(SOCK_DGRAM, h->address, portnum, portnum, |
2931 | 1, NULL, &errstr); | |
b0019c78 | 2932 | if (r < 0) goto defer; |
27f9999e | 2933 | len = Ustrlen(arg); |
9cb1785a | 2934 | r = send(s, arg, len, 0); |
b1f8e4f8 JH |
2935 | if (r < 0) |
2936 | { | |
2937 | errstr = US strerror(errno); | |
2938 | close(s); | |
2939 | goto defer; | |
2940 | } | |
2941 | close(s); | |
b0019c78 TF |
2942 | if (r < len) |
2943 | { | |
2944 | *log_msgptr = | |
2945 | string_sprintf("\"udpsend\" truncated from %d to %d octets", len, r); | |
2946 | return DEFER; | |
2947 | } | |
2948 | ||
2949 | HDEBUG(D_acl) | |
2950 | debug_printf("udpsend %d bytes\n", r); | |
2951 | ||
2952 | return OK; | |
2953 | ||
2954 | defer: | |
b1f8e4f8 | 2955 | *log_msgptr = string_sprintf("\"udpsend\" failed: %s", errstr); |
b0019c78 TF |
2956 | return DEFER; |
2957 | } | |
2958 | ||
2959 | ||
2960 | ||
059ec3d9 PH |
2961 | /************************************************* |
2962 | * Handle conditions/modifiers on an ACL item * | |
2963 | *************************************************/ | |
2964 | ||
2965 | /* Called from acl_check() below. | |
2966 | ||
2967 | Arguments: | |
2968 | verb ACL verb | |
2969 | cb ACL condition block - if NULL, result is OK | |
2970 | where where called from | |
2971 | addr the address being checked for RCPT, or NULL | |
2972 | level the nesting level | |
2973 | epp pointer to pass back TRUE if "endpass" encountered | |
2974 | (applies only to "accept" and "discard") | |
2975 | user_msgptr user message pointer | |
2976 | log_msgptr log message pointer | |
2977 | basic_errno pointer to where to put verify error | |
2978 | ||
2979 | Returns: OK - all conditions are met | |
2980 | DISCARD - an "acl" condition returned DISCARD - only allowed | |
2981 | for "accept" or "discard" verbs | |
2982 | FAIL - at least one condition fails | |
2983 | FAIL_DROP - an "acl" condition returned FAIL_DROP | |
2984 | DEFER - can't tell at the moment (typically, lookup defer, | |
2985 | but can be temporary callout problem) | |
2986 | ERROR - ERROR from nested ACL or expansion failure or other | |
2987 | error | |
2988 | */ | |
2989 | ||
2990 | static int | |
2991 | acl_check_condition(int verb, acl_condition_block *cb, int where, | |
2992 | address_item *addr, int level, BOOL *epp, uschar **user_msgptr, | |
2993 | uschar **log_msgptr, int *basic_errno) | |
2994 | { | |
2995 | uschar *user_message = NULL; | |
2996 | uschar *log_message = NULL; | |
ed7f7860 PP |
2997 | uschar *debug_tag = NULL; |
2998 | uschar *debug_opts = NULL; | |
059ec3d9 | 2999 | int rc = OK; |
8523533c | 3000 | #ifdef WITH_CONTENT_SCAN |
0f0c8159 | 3001 | int sep = -'/'; |
8523533c | 3002 | #endif |
059ec3d9 PH |
3003 | |
3004 | for (; cb != NULL; cb = cb->next) | |
3005 | { | |
55414b25 | 3006 | const uschar *arg; |
8e669ac1 | 3007 | int control_type; |
059ec3d9 PH |
3008 | |
3009 | /* The message and log_message items set up messages to be used in | |
3010 | case of rejection. They are expanded later. */ | |
3011 | ||
3012 | if (cb->type == ACLC_MESSAGE) | |
3013 | { | |
187bc588 | 3014 | HDEBUG(D_acl) debug_printf(" message: %s\n", cb->arg); |
059ec3d9 PH |
3015 | user_message = cb->arg; |
3016 | continue; | |
3017 | } | |
3018 | ||
3019 | if (cb->type == ACLC_LOG_MESSAGE) | |
3020 | { | |
187bc588 | 3021 | HDEBUG(D_acl) debug_printf("l_message: %s\n", cb->arg); |
059ec3d9 PH |
3022 | log_message = cb->arg; |
3023 | continue; | |
3024 | } | |
3025 | ||
3026 | /* The endpass "condition" just sets a flag to show it occurred. This is | |
3027 | checked at compile time to be on an "accept" or "discard" item. */ | |
3028 | ||
3029 | if (cb->type == ACLC_ENDPASS) | |
3030 | { | |
3031 | *epp = TRUE; | |
3032 | continue; | |
3033 | } | |
3034 | ||
3035 | /* For other conditions and modifiers, the argument is expanded now for some | |
3036 | of them, but not for all, because expansion happens down in some lower level | |
3037 | checking functions in some cases. */ | |
3038 | ||
3039 | if (cond_expand_at_top[cb->type]) | |
3040 | { | |
3041 | arg = expand_string(cb->arg); | |
3042 | if (arg == NULL) | |
3043 | { | |
3044 | if (expand_string_forcedfail) continue; | |
3045 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
3046 | cb->arg, expand_string_message); | |
3047 | return search_find_defer? DEFER : ERROR; | |
3048 | } | |
3049 | } | |
3050 | else arg = cb->arg; | |
3051 | ||
3052 | /* Show condition, and expanded condition if it's different */ | |
3053 | ||
3054 | HDEBUG(D_acl) | |
3055 | { | |
3056 | int lhswidth = 0; | |
3057 | debug_printf("check %s%s %n", | |
3058 | (!cond_modifiers[cb->type] && cb->u.negated)? "!":"", | |
3059 | conditions[cb->type], &lhswidth); | |
3060 | ||
3061 | if (cb->type == ACLC_SET) | |
3062 | { | |
38a0a95f PH |
3063 | debug_printf("acl_%s ", cb->u.varname); |
3064 | lhswidth += 5 + Ustrlen(cb->u.varname); | |
059ec3d9 PH |
3065 | } |
3066 | ||
3067 | debug_printf("= %s\n", cb->arg); | |
3068 | ||
3069 | if (arg != cb->arg) | |
3070 | debug_printf("%.*s= %s\n", lhswidth, | |
3071 | US" ", CS arg); | |
3072 | } | |
3073 | ||
3074 | /* Check that this condition makes sense at this time */ | |
3075 | ||
3076 | if ((cond_forbids[cb->type] & (1 << where)) != 0) | |
3077 | { | |
3078 | *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL", | |
3079 | cond_modifiers[cb->type]? "use" : "test", | |
3080 | conditions[cb->type], acl_wherenames[where]); | |
3081 | return ERROR; | |
3082 | } | |
3083 | ||
3084 | /* Run the appropriate test for each condition, or take the appropriate | |
3085 | action for the remaining modifiers. */ | |
3086 | ||
3087 | switch(cb->type) | |
3088 | { | |
71fafd95 PH |
3089 | case ACLC_ADD_HEADER: |
3090 | setup_header(arg); | |
3091 | break; | |
3092 | ||
059ec3d9 PH |
3093 | /* A nested ACL that returns "discard" makes sense only for an "accept" or |
3094 | "discard" verb. */ | |
71fafd95 | 3095 | |
059ec3d9 | 3096 | case ACLC_ACL: |
f60d98e8 | 3097 | rc = acl_check_wargs(where, addr, arg, level+1, user_msgptr, log_msgptr); |
7421ecab JH |
3098 | if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD) |
3099 | { | |
3100 | *log_msgptr = string_sprintf("nested ACL returned \"discard\" for " | |
3101 | "\"%s\" command (only allowed with \"accept\" or \"discard\")", | |
3102 | verbs[verb]); | |
3103 | return ERROR; | |
3104 | } | |
059ec3d9 PH |
3105 | break; |
3106 | ||
3107 | case ACLC_AUTHENTICATED: | |
3108 | rc = (sender_host_authenticated == NULL)? FAIL : | |
3109 | match_isinlist(sender_host_authenticated, &arg, 0, NULL, NULL, MCL_STRING, | |
3110 | TRUE, NULL); | |
3111 | break; | |
3112 | ||
71fafd95 | 3113 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
8523533c TK |
3114 | case ACLC_BMI_OPTIN: |
3115 | { | |
3116 | int old_pool = store_pool; | |
3117 | store_pool = POOL_PERM; | |
3118 | bmi_current_optin = string_copy(arg); | |
3119 | store_pool = old_pool; | |
3120 | } | |
3121 | break; | |
71fafd95 | 3122 | #endif |
8523533c | 3123 | |
059ec3d9 | 3124 | case ACLC_CONDITION: |
f3766eb5 NM |
3125 | /* The true/false parsing here should be kept in sync with that used in |
3126 | expand.c when dealing with ECOND_BOOL so that we don't have too many | |
3127 | different definitions of what can be a boolean. */ | |
51c7471d JH |
3128 | if (*arg == '-' |
3129 | ? Ustrspn(arg+1, "0123456789") == Ustrlen(arg+1) /* Negative number */ | |
3130 | : Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */ | |
059ec3d9 PH |
3131 | rc = (Uatoi(arg) == 0)? FAIL : OK; |
3132 | else | |
3133 | rc = (strcmpic(arg, US"no") == 0 || | |
3134 | strcmpic(arg, US"false") == 0)? FAIL : | |
3135 | (strcmpic(arg, US"yes") == 0 || | |
3136 | strcmpic(arg, US"true") == 0)? OK : DEFER; | |
3137 | if (rc == DEFER) | |
3138 | *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg); | |
3139 | break; | |
3140 | ||
c3611384 PH |
3141 | case ACLC_CONTINUE: /* Always succeeds */ |
3142 | break; | |
3143 | ||
059ec3d9 | 3144 | case ACLC_CONTROL: |
c5fcb476 | 3145 | { |
55414b25 JH |
3146 | const uschar *p = NULL; |
3147 | control_type = decode_control(arg, &p, where, log_msgptr); | |
4840604e | 3148 | |
55414b25 | 3149 | /* Check if this control makes sense at this time */ |
f7572e5a | 3150 | |
55414b25 JH |
3151 | if ((control_forbids[control_type] & (1 << where)) != 0) |
3152 | { | |
3153 | *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL", | |
3154 | controls[control_type], acl_wherenames[where]); | |
3155 | return ERROR; | |
3156 | } | |
8800895a | 3157 | |
55414b25 JH |
3158 | switch(control_type) |
3159 | { | |
3160 | case CONTROL_AUTH_UNADVERTISED: | |
3161 | allow_auth_unadvertised = TRUE; | |
3162 | break; | |
3163 | ||
3164 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
3165 | case CONTROL_BMI_RUN: | |
3166 | bmi_run = 1; | |
3167 | break; | |
3168 | #endif | |
3169 | ||
3170 | #ifndef DISABLE_DKIM | |
3171 | case CONTROL_DKIM_VERIFY: | |
3172 | dkim_disable_verify = TRUE; | |
3173 | #ifdef EXPERIMENTAL_DMARC | |
3174 | /* Since DKIM was blocked, skip DMARC too */ | |
3175 | dmarc_disable_verify = TRUE; | |
3176 | dmarc_enable_forensic = FALSE; | |
3177 | #endif | |
3178 | break; | |
3179 | #endif | |
3180 | ||
3181 | #ifdef EXPERIMENTAL_DMARC | |
3182 | case CONTROL_DMARC_VERIFY: | |
3183 | dmarc_disable_verify = TRUE; | |
3184 | break; | |
3185 | ||
3186 | case CONTROL_DMARC_FORENSIC: | |
3187 | dmarc_enable_forensic = TRUE; | |
3188 | break; | |
3189 | #endif | |
3190 | ||
3191 | case CONTROL_DSCP: | |
3192 | if (*p == '/') | |
3193 | { | |
3194 | int fd, af, level, optname, value; | |
3195 | /* If we are acting on stdin, the setsockopt may fail if stdin is not | |
3196 | a socket; we can accept that, we'll just debug-log failures anyway. */ | |
3197 | fd = fileno(smtp_in); | |
3198 | af = ip_get_address_family(fd); | |
3199 | if (af < 0) | |
3200 | { | |
3201 | HDEBUG(D_acl) | |
3202 | debug_printf("smtp input is probably not a socket [%s], not setting DSCP\n", | |
3203 | strerror(errno)); | |
3204 | break; | |
3205 | } | |
3206 | if (dscp_lookup(p+1, af, &level, &optname, &value)) | |
3207 | { | |
3208 | if (setsockopt(fd, level, optname, &value, sizeof(value)) < 0) | |
3209 | { | |
3210 | HDEBUG(D_acl) debug_printf("failed to set input DSCP[%s]: %s\n", | |
3211 | p+1, strerror(errno)); | |
3212 | } | |
3213 | else | |
3214 | { | |
3215 | HDEBUG(D_acl) debug_printf("set input DSCP to \"%s\"\n", p+1); | |
3216 | } | |
3217 | } | |
3218 | else | |
3219 | { | |
3220 | *log_msgptr = string_sprintf("unrecognised DSCP value in \"control=%s\"", arg); | |
3221 | return ERROR; | |
3222 | } | |
3223 | } | |
3224 | else | |
3225 | { | |
3226 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3227 | return ERROR; | |
3228 | } | |
3229 | break; | |
3230 | ||
3231 | case CONTROL_ERROR: | |
3232 | return ERROR; | |
3233 | ||
3234 | case CONTROL_CASEFUL_LOCAL_PART: | |
3235 | deliver_localpart = addr->cc_local_part; | |
3236 | break; | |
3237 | ||
3238 | case CONTROL_CASELOWER_LOCAL_PART: | |
3239 | deliver_localpart = addr->lc_local_part; | |
3240 | break; | |
3241 | ||
3242 | case CONTROL_ENFORCE_SYNC: | |
3243 | smtp_enforce_sync = TRUE; | |
3244 | break; | |
3245 | ||
3246 | case CONTROL_NO_ENFORCE_SYNC: | |
3247 | smtp_enforce_sync = FALSE; | |
3248 | break; | |
3249 | ||
3250 | #ifdef WITH_CONTENT_SCAN | |
3251 | case CONTROL_NO_MBOX_UNSPOOL: | |
3252 | no_mbox_unspool = TRUE; | |
3253 | break; | |
3254 | #endif | |
3255 | ||
3256 | case CONTROL_NO_MULTILINE: | |
3257 | no_multiline_responses = TRUE; | |
3258 | break; | |
3259 | ||
3260 | case CONTROL_NO_PIPELINING: | |
3261 | pipelining_enable = FALSE; | |
3262 | break; | |
3263 | ||
3264 | case CONTROL_NO_DELAY_FLUSH: | |
3265 | disable_delay_flush = TRUE; | |
3266 | break; | |
3267 | ||
3268 | case CONTROL_NO_CALLOUT_FLUSH: | |
3269 | disable_callout_flush = TRUE; | |
3270 | break; | |
3271 | ||
3272 | case CONTROL_FAKEREJECT: | |
3273 | cancel_cutthrough_connection("fakereject"); | |
3274 | case CONTROL_FAKEDEFER: | |
3275 | fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL; | |
3276 | if (*p == '/') | |
3277 | { | |
3278 | const uschar *pp = p + 1; | |
3279 | while (*pp != 0) pp++; | |
3280 | fake_response_text = expand_string(string_copyn(p+1, pp-p-1)); | |
3281 | p = pp; | |
3282 | } | |
3283 | else | |
3284 | { | |
3285 | /* Explicitly reset to default string */ | |
3286 | 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)."; | |
3287 | } | |
3288 | break; | |
ed7f7860 | 3289 | |
55414b25 JH |
3290 | case CONTROL_FREEZE: |
3291 | deliver_freeze = TRUE; | |
3292 | deliver_frozen_at = time(NULL); | |
3293 | freeze_tell = freeze_tell_config; /* Reset to configured value */ | |
3294 | if (Ustrncmp(p, "/no_tell", 8) == 0) | |
3295 | { | |
3296 | p += 8; | |
3297 | freeze_tell = NULL; | |
3298 | } | |
3299 | if (*p != 0) | |
3300 | { | |
3301 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3302 | return ERROR; | |
3303 | } | |
3304 | cancel_cutthrough_connection("item frozen"); | |
3305 | break; | |
3306 | ||
3307 | case CONTROL_QUEUE_ONLY: | |
3308 | queue_only_policy = TRUE; | |
3309 | cancel_cutthrough_connection("queueing forced"); | |
3310 | break; | |
3311 | ||
3312 | case CONTROL_SUBMISSION: | |
3313 | originator_name = US""; | |
3314 | submission_mode = TRUE; | |
3315 | while (*p == '/') | |
3316 | { | |
3317 | if (Ustrncmp(p, "/sender_retain", 14) == 0) | |
3318 | { | |
3319 | p += 14; | |
3320 | active_local_sender_retain = TRUE; | |
3321 | active_local_from_check = FALSE; | |
3322 | } | |
3323 | else if (Ustrncmp(p, "/domain=", 8) == 0) | |
3324 | { | |
3325 | const uschar *pp = p + 8; | |
3326 | while (*pp != 0 && *pp != '/') pp++; | |
3327 | submission_domain = string_copyn(p+8, pp-p-8); | |
3328 | p = pp; | |
3329 | } | |
3330 | /* The name= option must be last, because it swallows the rest of | |
3331 | the string. */ | |
3332 | else if (Ustrncmp(p, "/name=", 6) == 0) | |
3333 | { | |
3334 | const uschar *pp = p + 6; | |
3335 | while (*pp != 0) pp++; | |
3336 | submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6, | |
3337 | big_buffer, big_buffer_size)); | |
3338 | p = pp; | |
3339 | } | |
3340 | else break; | |
3341 | } | |
3342 | if (*p != 0) | |
3343 | { | |
3344 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3345 | return ERROR; | |
3346 | } | |
3347 | break; | |
e4bdf652 | 3348 | |
55414b25 JH |
3349 | case CONTROL_DEBUG: |
3350 | while (*p == '/') | |
3351 | { | |
3352 | if (Ustrncmp(p, "/tag=", 5) == 0) | |
3353 | { | |
3354 | const uschar *pp = p + 5; | |
3355 | while (*pp != '\0' && *pp != '/') pp++; | |
3356 | debug_tag = string_copyn(p+5, pp-p-5); | |
3357 | p = pp; | |
3358 | } | |
3359 | else if (Ustrncmp(p, "/opts=", 6) == 0) | |
3360 | { | |
3361 | const uschar *pp = p + 6; | |
3362 | while (*pp != '\0' && *pp != '/') pp++; | |
3363 | debug_opts = string_copyn(p+6, pp-p-6); | |
3364 | p = pp; | |
3365 | } | |
3366 | } | |
3367 | debug_logging_activate(debug_tag, debug_opts); | |
3368 | break; | |
3369 | ||
3370 | case CONTROL_SUPPRESS_LOCAL_FIXUPS: | |
3371 | suppress_local_fixups = TRUE; | |
3372 | break; | |
3373 | ||
3374 | case CONTROL_CUTTHROUGH_DELIVERY: | |
3375 | if (prdr_requested) | |
3376 | /* Too hard to think about for now. We might in future cutthrough | |
3377 | the case where both sides handle prdr and this-node prdr acl | |
3378 | is "accept" */ | |
93a6fce2 | 3379 | *log_msgptr = string_sprintf("PRDR on %s reception\n", arg); |
5032d1cf JH |
3380 | else |
3381 | { | |
55414b25 JH |
3382 | if (deliver_freeze) |
3383 | *log_msgptr = US"frozen"; | |
3384 | else if (queue_only_policy) | |
3385 | *log_msgptr = US"queue-only"; | |
3386 | else if (fake_response == FAIL) | |
3387 | *log_msgptr = US"fakereject"; | |
3388 | else | |
3389 | { | |
3390 | if (rcpt_count == 1) cutthrough.delivery = TRUE; | |
3391 | break; | |
3392 | } | |
3393 | *log_msgptr = string_sprintf("\"control=%s\" on %s item", | |
3394 | arg, *log_msgptr); | |
5032d1cf | 3395 | } |
55414b25 | 3396 | return ERROR; |
3c8b3577 JH |
3397 | |
3398 | #ifdef EXPERIMENTAL_INTERNATIONAL | |
3399 | case CONTROL_UTF8_DOWNCONVERT: | |
3400 | if (*p == '/') | |
3401 | { | |
921dfc11 JH |
3402 | if (p[1] == '1') |
3403 | { | |
3404 | message_utf8_downconvert = 1; | |
3405 | addr->prop.utf8_downcvt = TRUE; | |
3406 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3407 | p += 2; | |
3408 | break; | |
3409 | } | |
3410 | if (p[1] == '0') | |
3411 | { | |
3412 | message_utf8_downconvert = 0; | |
3413 | addr->prop.utf8_downcvt = FALSE; | |
3414 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3415 | p += 2; | |
3416 | break; | |
3417 | } | |
3c8b3577 | 3418 | if (p[1] == '-' && p[2] == '1') |
921dfc11 JH |
3419 | { |
3420 | message_utf8_downconvert = -1; | |
3421 | addr->prop.utf8_downcvt = FALSE; | |
3422 | addr->prop.utf8_downcvt_maybe = TRUE; | |
3423 | p += 3; | |
3424 | break; | |
3425 | } | |
3c8b3577 JH |
3426 | *log_msgptr = US"bad option value for control=utf8_downconvert"; |
3427 | } | |
3428 | else | |
3429 | { | |
921dfc11 JH |
3430 | message_utf8_downconvert = 1; |
3431 | addr->prop.utf8_downcvt = TRUE; | |
3432 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3433 | break; | |
3c8b3577 JH |
3434 | } |
3435 | return ERROR; | |
3436 | #endif | |
3437 | ||
9171d434 | 3438 | } |
55414b25 | 3439 | break; |
059ec3d9 | 3440 | } |
059ec3d9 | 3441 | |
6a8f9482 TK |
3442 | #ifdef EXPERIMENTAL_DCC |
3443 | case ACLC_DCC: | |
3444 | { | |
3445 | /* Seperate the regular expression and any optional parameters. */ | |
55414b25 JH |
3446 | const uschar * list = arg; |
3447 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
6a8f9482 TK |
3448 | /* Run the dcc backend. */ |
3449 | rc = dcc_process(&ss); | |
3450 | /* Modify return code based upon the existance of options. */ | |
3c8b3577 | 3451 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) |
6a8f9482 | 3452 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) |
3c8b3577 | 3453 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ |
6a8f9482 TK |
3454 | } |
3455 | break; | |
3456 | #endif | |
3457 | ||
71fafd95 | 3458 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3459 | case ACLC_DECODE: |
3460 | rc = mime_decode(&arg); | |
3461 | break; | |
71fafd95 | 3462 | #endif |
8523533c | 3463 | |
059ec3d9 PH |
3464 | case ACLC_DELAY: |
3465 | { | |
3466 | int delay = readconf_readtime(arg, 0, FALSE); | |
3467 | if (delay < 0) | |
3468 | { | |
3469 | *log_msgptr = string_sprintf("syntax error in argument for \"delay\" " | |
3470 | "modifier: \"%s\" is not a time value", arg); | |
3471 | return ERROR; | |
3472 | } | |
3473 | else | |
3474 | { | |
3475 | HDEBUG(D_acl) debug_printf("delay modifier requests %d-second delay\n", | |
3476 | delay); | |
3477 | if (host_checking) | |
3478 | { | |
3479 | HDEBUG(D_acl) | |
3480 | debug_printf("delay skipped in -bh checking mode\n"); | |
3481 | } | |
010c2d14 PH |
3482 | |
3483 | /* It appears to be impossible to detect that a TCP/IP connection has | |
3484 | gone away without reading from it. This means that we cannot shorten | |
3485 | the delay below if the client goes away, because we cannot discover | |
3486 | that the client has closed its end of the connection. (The connection | |
3487 | is actually in a half-closed state, waiting for the server to close its | |
3488 | end.) It would be nice to be able to detect this state, so that the | |
3489 | Exim process is not held up unnecessarily. However, it seems that we | |
3490 | can't. The poll() function does not do the right thing, and in any case | |
3491 | it is not always available. | |
3492 | ||
047bdd8c | 3493 | NOTE 1: If ever this state of affairs changes, remember that we may be |
010c2d14 | 3494 | dealing with stdin/stdout here, in addition to TCP/IP connections. |
047bdd8c PH |
3495 | Also, delays may be specified for non-SMTP input, where smtp_out and |
3496 | smtp_in will be NULL. Whatever is done must work in all cases. | |
3497 | ||
3498 | NOTE 2: The added feature of flushing the output before a delay must | |
3499 | apply only to SMTP input. Hence the test for smtp_out being non-NULL. | |
3500 | */ | |
010c2d14 | 3501 | |
8e669ac1 | 3502 | else |
86b8287f | 3503 | { |
14f4a80d | 3504 | if (smtp_out != NULL && !disable_delay_flush) mac_smtp_fflush(); |
86b8287f | 3505 | while (delay > 0) delay = sleep(delay); |
8e669ac1 | 3506 | } |
059ec3d9 PH |
3507 | } |
3508 | } | |
3509 | break; | |
3510 | ||
71fafd95 | 3511 | #ifdef WITH_OLD_DEMIME |
8523533c TK |
3512 | case ACLC_DEMIME: |
3513 | rc = demime(&arg); | |
3514 | break; | |
71fafd95 | 3515 | #endif |
8523533c | 3516 | |
80a47a2c TK |
3517 | #ifndef DISABLE_DKIM |
3518 | case ACLC_DKIM_SIGNER: | |
9e5d6b55 TK |
3519 | if (dkim_cur_signer != NULL) |
3520 | rc = match_isinlist(dkim_cur_signer, | |
80a47a2c | 3521 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); |
80a47a2c | 3522 | else |
80a47a2c | 3523 | rc = FAIL; |
71fafd95 PH |
3524 | break; |
3525 | ||
80a47a2c TK |
3526 | case ACLC_DKIM_STATUS: |
3527 | rc = match_isinlist(dkim_exim_expand_query(DKIM_VERIFY_STATUS), | |
3528 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); | |
71fafd95 PH |
3529 | break; |
3530 | #endif | |
fb2274d4 | 3531 | |
4840604e TL |
3532 | #ifdef EXPERIMENTAL_DMARC |
3533 | case ACLC_DMARC_STATUS: | |
4a8ce2d8 | 3534 | if (!dmarc_has_been_checked) |
4840604e | 3535 | dmarc_process(); |
4a8ce2d8 | 3536 | dmarc_has_been_checked = TRUE; |
4840604e TL |
3537 | /* used long way of dmarc_exim_expand_query() in case we need more |
3538 | * view into the process in the future. */ | |
3539 | rc = match_isinlist(dmarc_exim_expand_query(DMARC_VERIFY_STATUS), | |
3540 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); | |
3541 | break; | |
3542 | #endif | |
3543 | ||
059ec3d9 PH |
3544 | case ACLC_DNSLISTS: |
3545 | rc = verify_check_dnsbl(&arg); | |
3546 | break; | |
3547 | ||
3548 | case ACLC_DOMAINS: | |
3549 | rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor, | |
55414b25 | 3550 | addr->domain_cache, MCL_DOMAIN, TRUE, CUSS &deliver_domain_data); |
059ec3d9 PH |
3551 | break; |
3552 | ||
3553 | /* The value in tls_cipher is the full cipher name, for example, | |
3554 | TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the | |
3555 | cipher names such as DES-CBC3-SHA. But program defensively. We don't know | |
3556 | what may in practice come out of the SSL library - which at the time of | |
3557 | writing is poorly documented. */ | |
3558 | ||
3559 | case ACLC_ENCRYPTED: | |
817d9f57 | 3560 | if (tls_in.cipher == NULL) rc = FAIL; else |
059ec3d9 PH |
3561 | { |
3562 | uschar *endcipher = NULL; | |
817d9f57 JH |
3563 | uschar *cipher = Ustrchr(tls_in.cipher, ':'); |
3564 | if (cipher == NULL) cipher = tls_in.cipher; else | |
059ec3d9 PH |
3565 | { |
3566 | endcipher = Ustrchr(++cipher, ':'); | |
3567 | if (endcipher != NULL) *endcipher = 0; | |
3568 | } | |
3569 | rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL); | |
3570 | if (endcipher != NULL) *endcipher = ':'; | |
3571 | } | |
3572 | break; | |
3573 | ||
3574 | /* Use verify_check_this_host() instead of verify_check_host() so that | |
3575 | we can pass over &host_data to catch any looked up data. Once it has been | |
3576 | set, it retains its value so that it's still there if another ACL verb | |
3577 | comes through here and uses the cache. However, we must put it into | |
3578 | permanent store in case it is also expected to be used in a subsequent | |
3579 | message in the same SMTP connection. */ | |
3580 | ||
3581 | case ACLC_HOSTS: | |
3582 | rc = verify_check_this_host(&arg, sender_host_cache, NULL, | |
55414b25 JH |
3583 | (sender_host_address == NULL)? US"" : sender_host_address, |
3584 | CUSS &host_data); | |
059ec3d9 PH |
3585 | if (host_data != NULL) host_data = string_copy_malloc(host_data); |
3586 | break; | |
3587 | ||
3588 | case ACLC_LOCAL_PARTS: | |
3589 | rc = match_isinlist(addr->cc_local_part, &arg, 0, | |
3590 | &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE, | |
55414b25 | 3591 | CUSS &deliver_localpart_data); |
059ec3d9 PH |
3592 | break; |
3593 | ||
6ea85e9a PH |
3594 | case ACLC_LOG_REJECT_TARGET: |
3595 | { | |
3596 | int logbits = 0; | |
3597 | int sep = 0; | |
55414b25 | 3598 | const uschar *s = arg; |
6ea85e9a PH |
3599 | uschar *ss; |
3600 | while ((ss = string_nextinlist(&s, &sep, big_buffer, big_buffer_size)) | |
3601 | != NULL) | |
3602 | { | |
3603 | if (Ustrcmp(ss, "main") == 0) logbits |= LOG_MAIN; | |
3604 | else if (Ustrcmp(ss, "panic") == 0) logbits |= LOG_PANIC; | |
3605 | else if (Ustrcmp(ss, "reject") == 0) logbits |= LOG_REJECT; | |
3606 | else | |
3607 | { | |
3608 | logbits |= LOG_MAIN|LOG_REJECT; | |
3609 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown log name \"%s\" in " | |
3610 | "\"log_reject_target\" in %s ACL", ss, acl_wherenames[where]); | |
3611 | } | |
3612 | } | |
3613 | log_reject_target = logbits; | |
3614 | } | |
3615 | break; | |
3616 | ||
059ec3d9 PH |
3617 | case ACLC_LOGWRITE: |
3618 | { | |
3619 | int logbits = 0; | |
55414b25 | 3620 | const uschar *s = arg; |
059ec3d9 PH |
3621 | if (*s == ':') |
3622 | { | |
3623 | s++; | |
3624 | while (*s != ':') | |
3625 | { | |
3626 | if (Ustrncmp(s, "main", 4) == 0) | |
3627 | { logbits |= LOG_MAIN; s += 4; } | |
3628 | else if (Ustrncmp(s, "panic", 5) == 0) | |
3629 | { logbits |= LOG_PANIC; s += 5; } | |
3630 | else if (Ustrncmp(s, "reject", 6) == 0) | |
3631 | { logbits |= LOG_REJECT; s += 6; } | |
3632 | else | |
3633 | { | |
3634 | logbits = LOG_MAIN|LOG_PANIC; | |
3635 | s = string_sprintf(":unknown log name in \"%s\" in " | |
3636 | "\"logwrite\" in %s ACL", arg, acl_wherenames[where]); | |
3637 | } | |
3638 | if (*s == ',') s++; | |
3639 | } | |
3640 | s++; | |
3641 | } | |
3642 | while (isspace(*s)) s++; | |
6ea85e9a PH |
3643 | |
3644 | ||
059ec3d9 PH |
3645 | if (logbits == 0) logbits = LOG_MAIN; |
3646 | log_write(0, logbits, "%s", string_printing(s)); | |
3647 | } | |
3648 | break; | |
8e669ac1 | 3649 | |
71fafd95 | 3650 | #ifdef WITH_CONTENT_SCAN |
0f0c8159 | 3651 | case ACLC_MALWARE: /* Run the malware backend. */ |
8523533c | 3652 | { |
6ea85e9a | 3653 | /* Separate the regular expression and any optional parameters. */ |
55414b25 JH |
3654 | const uschar * list = arg; |
3655 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
0f0c8159 JH |
3656 | uschar *opt; |
3657 | BOOL defer_ok = FALSE; | |
3658 | int timeout = 0; | |
3659 | ||
55414b25 | 3660 | while ((opt = string_nextinlist(&list, &sep, NULL, 0))) |
0f0c8159 JH |
3661 | if (strcmpic(opt, US"defer_ok") == 0) |
3662 | defer_ok = TRUE; | |
3663 | else if ( strncmpic(opt, US"tmo=", 4) == 0 | |
3664 | && (timeout = readconf_readtime(opt+4, '\0', FALSE)) < 0 | |
3665 | ) | |
3666 | { | |
3667 | *log_msgptr = string_sprintf("bad timeout value in '%s'", opt); | |
3668 | return ERROR; | |
3669 | } | |
3670 | ||
3671 | rc = malware(ss, timeout); | |
3672 | if (rc == DEFER && defer_ok) | |
3673 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ | |
8523533c TK |
3674 | } |
3675 | break; | |
3676 | ||
3677 | case ACLC_MIME_REGEX: | |
71fafd95 | 3678 | rc = mime_regex(&arg); |
8523533c | 3679 | break; |
71fafd95 | 3680 | #endif |
059ec3d9 | 3681 | |
870f6ba8 | 3682 | case ACLC_RATELIMIT: |
90fc3069 | 3683 | rc = acl_ratelimit(arg, where, log_msgptr); |
870f6ba8 TF |
3684 | break; |
3685 | ||
059ec3d9 | 3686 | case ACLC_RECIPIENTS: |
55414b25 JH |
3687 | rc = match_address_list((const uschar *)addr->address, TRUE, TRUE, &arg, NULL, -1, 0, |
3688 | CUSS &recipient_data); | |
059ec3d9 PH |
3689 | break; |
3690 | ||
71fafd95 PH |
3691 | #ifdef WITH_CONTENT_SCAN |
3692 | case ACLC_REGEX: | |
3693 | rc = regex(&arg); | |
8523533c | 3694 | break; |
71fafd95 | 3695 | #endif |
8523533c | 3696 | |
e7568d51 TL |
3697 | case ACLC_REMOVE_HEADER: |
3698 | setup_remove_header(arg); | |
3699 | break; | |
3700 | ||
059ec3d9 PH |
3701 | case ACLC_SENDER_DOMAINS: |
3702 | { | |
3703 | uschar *sdomain; | |
3704 | sdomain = Ustrrchr(sender_address, '@'); | |
3705 | sdomain = (sdomain == NULL)? US"" : sdomain + 1; | |
3706 | rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor, | |
3707 | sender_domain_cache, MCL_DOMAIN, TRUE, NULL); | |
3708 | } | |
3709 | break; | |
3710 | ||
3711 | case ACLC_SENDERS: | |
55414b25 JH |
3712 | rc = match_address_list((const uschar *)sender_address, TRUE, TRUE, &arg, |
3713 | sender_address_cache, -1, 0, CUSS &sender_data); | |
059ec3d9 PH |
3714 | break; |
3715 | ||
3716 | /* Connection variables must persist forever */ | |
3717 | ||
3718 | case ACLC_SET: | |
3719 | { | |
3720 | int old_pool = store_pool; | |
38a0a95f PH |
3721 | if (cb->u.varname[0] == 'c') store_pool = POOL_PERM; |
3722 | acl_var_create(cb->u.varname)->data.ptr = string_copy(arg); | |
059ec3d9 PH |
3723 | store_pool = old_pool; |
3724 | } | |
3725 | break; | |
3726 | ||
71fafd95 | 3727 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3728 | case ACLC_SPAM: |
3729 | { | |
3730 | /* Seperate the regular expression and any optional parameters. */ | |
55414b25 JH |
3731 | const uschar * list = arg; |
3732 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
8523533c | 3733 | /* Run the spam backend. */ |
55414b25 | 3734 | rc = spam(CUSS &ss); |
8523533c | 3735 | /* Modify return code based upon the existance of options. */ |
55414b25 | 3736 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) |
8523533c TK |
3737 | != NULL) { |
3738 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
3739 | { | |
3740 | /* FAIL so that the message is passed to the next ACL */ | |
3741 | rc = FAIL; | |
3742 | } | |
3743 | } | |
3744 | } | |
3745 | break; | |
71fafd95 | 3746 | #endif |
8523533c | 3747 | |
71fafd95 | 3748 | #ifdef EXPERIMENTAL_SPF |
8523533c | 3749 | case ACLC_SPF: |
65a7d8c3 NM |
3750 | rc = spf_process(&arg, sender_address, SPF_PROCESS_NORMAL); |
3751 | break; | |
3752 | case ACLC_SPF_GUESS: | |
3753 | rc = spf_process(&arg, sender_address, SPF_PROCESS_GUESS); | |
8523533c | 3754 | break; |
71fafd95 | 3755 | #endif |
8523533c | 3756 | |
b0019c78 TF |
3757 | case ACLC_UDPSEND: |
3758 | rc = acl_udpsend(arg, log_msgptr); | |
3759 | break; | |
3760 | ||
059ec3d9 PH |
3761 | /* If the verb is WARN, discard any user message from verification, because |
3762 | such messages are SMTP responses, not header additions. The latter come | |
475fe28a PH |
3763 | only from explicit "message" modifiers. However, put the user message into |
3764 | $acl_verify_message so it can be used in subsequent conditions or modifiers | |
3765 | (until something changes it). */ | |
059ec3d9 PH |
3766 | |
3767 | case ACLC_VERIFY: | |
3768 | rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno); | |
475fe28a | 3769 | acl_verify_message = *user_msgptr; |
059ec3d9 PH |
3770 | if (verb == ACL_WARN) *user_msgptr = NULL; |
3771 | break; | |
3772 | ||
3773 | default: | |
3774 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown " | |
3775 | "condition %d", cb->type); | |
3776 | break; | |
3777 | } | |
3778 | ||
3779 | /* If a condition was negated, invert OK/FAIL. */ | |
3780 | ||
3781 | if (!cond_modifiers[cb->type] && cb->u.negated) | |
3782 | { | |
3783 | if (rc == OK) rc = FAIL; | |
3784 | else if (rc == FAIL || rc == FAIL_DROP) rc = OK; | |
3785 | } | |
3786 | ||
3787 | if (rc != OK) break; /* Conditions loop */ | |
3788 | } | |
3789 | ||
3790 | ||
3791 | /* If the result is the one for which "message" and/or "log_message" are used, | |
4e88a19f PH |
3792 | handle the values of these modifiers. If there isn't a log message set, we make |
3793 | it the same as the user message. | |
059ec3d9 PH |
3794 | |
3795 | "message" is a user message that will be included in an SMTP response. Unless | |
3796 | it is empty, it overrides any previously set user message. | |
3797 | ||
3798 | "log_message" is a non-user message, and it adds to any existing non-user | |
3799 | message that is already set. | |
3800 | ||
4e88a19f PH |
3801 | Most verbs have but a single return for which the messages are relevant, but |
3802 | for "discard", it's useful to have the log message both when it succeeds and | |
3803 | when it fails. For "accept", the message is used in the OK case if there is no | |
3804 | "endpass", but (for backwards compatibility) in the FAIL case if "endpass" is | |
3805 | present. */ | |
059ec3d9 | 3806 | |
4e88a19f PH |
3807 | if (*epp && rc == OK) user_message = NULL; |
3808 | ||
3809 | if (((1<<rc) & msgcond[verb]) != 0) | |
059ec3d9 PH |
3810 | { |
3811 | uschar *expmessage; | |
4e88a19f PH |
3812 | uschar *old_user_msgptr = *user_msgptr; |
3813 | uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr; | |
059ec3d9 PH |
3814 | |
3815 | /* If the verb is "warn", messages generated by conditions (verification or | |
4e88a19f PH |
3816 | nested ACLs) are always discarded. This also happens for acceptance verbs |
3817 | when they actually do accept. Only messages specified at this level are used. | |
059ec3d9 PH |
3818 | However, the value of an existing message is available in $acl_verify_message |
3819 | during expansions. */ | |
3820 | ||
4e88a19f PH |
3821 | if (verb == ACL_WARN || |
3822 | (rc == OK && (verb == ACL_ACCEPT || verb == ACL_DISCARD))) | |
3823 | *log_msgptr = *user_msgptr = NULL; | |
059ec3d9 PH |
3824 | |
3825 | if (user_message != NULL) | |
3826 | { | |
3827 | acl_verify_message = old_user_msgptr; | |
3828 | expmessage = expand_string(user_message); | |
3829 | if (expmessage == NULL) | |
3830 | { | |
3831 | if (!expand_string_forcedfail) | |
3832 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3833 | user_message, expand_string_message); | |
3834 | } | |
3835 | else if (expmessage[0] != 0) *user_msgptr = expmessage; | |
3836 | } | |
3837 | ||
3838 | if (log_message != NULL) | |
3839 | { | |
3840 | acl_verify_message = old_log_msgptr; | |
3841 | expmessage = expand_string(log_message); | |
3842 | if (expmessage == NULL) | |
3843 | { | |
3844 | if (!expand_string_forcedfail) | |
3845 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3846 | log_message, expand_string_message); | |
3847 | } | |
3848 | else if (expmessage[0] != 0) | |
3849 | { | |
3850 | *log_msgptr = (*log_msgptr == NULL)? expmessage : | |
3851 | string_sprintf("%s: %s", expmessage, *log_msgptr); | |
3852 | } | |
3853 | } | |
3854 | ||
3855 | /* If no log message, default it to the user message */ | |
3856 | ||
3857 | if (*log_msgptr == NULL) *log_msgptr = *user_msgptr; | |
3858 | } | |
3859 | ||
3860 | acl_verify_message = NULL; | |
3861 | return rc; | |
3862 | } | |
3863 | ||
3864 | ||
3865 | ||
3866 | ||
3867 | ||
3868 | /************************************************* | |
3869 | * Get line from a literal ACL * | |
3870 | *************************************************/ | |
3871 | ||
3872 | /* This function is passed to acl_read() in order to extract individual lines | |
3873 | of a literal ACL, which we access via static pointers. We can destroy the | |
3874 | contents because this is called only once (the compiled ACL is remembered). | |
3875 | ||
3876 | This code is intended to treat the data in the same way as lines in the main | |
3877 | Exim configuration file. That is: | |
3878 | ||
3879 | . Leading spaces are ignored. | |
3880 | ||
3881 | . A \ at the end of a line is a continuation - trailing spaces after the \ | |
3882 | are permitted (this is because I don't believe in making invisible things | |
3883 | significant). Leading spaces on the continued part of a line are ignored. | |
3884 | ||
3885 | . Physical lines starting (significantly) with # are totally ignored, and | |
3886 | may appear within a sequence of backslash-continued lines. | |
3887 | ||
3888 | . Blank lines are ignored, but will end a sequence of continuations. | |
3889 | ||
3890 | Arguments: none | |
3891 | Returns: a pointer to the next line | |
3892 | */ | |
3893 | ||
3894 | ||
3895 | static uschar *acl_text; /* Current pointer in the text */ | |
3896 | static uschar *acl_text_end; /* Points one past the terminating '0' */ | |
3897 | ||
3898 | ||
3899 | static uschar * | |
3900 | acl_getline(void) | |
3901 | { | |
3902 | uschar *yield; | |
3903 | ||
3904 | /* This loop handles leading blank lines and comments. */ | |
3905 | ||
3906 | for(;;) | |
3907 | { | |
3908 | while (isspace(*acl_text)) acl_text++; /* Leading spaces/empty lines */ | |
3909 | if (*acl_text == 0) return NULL; /* No more data */ | |
3910 | yield = acl_text; /* Potential data line */ | |
3911 | ||
3912 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3913 | ||
3914 | /* If we hit the end before a newline, we have the whole logical line. If | |
3915 | it's a comment, there's no more data to be given. Otherwise, yield it. */ | |
3916 | ||
3917 | if (*acl_text == 0) return (*yield == '#')? NULL : yield; | |
3918 | ||
3919 | /* After reaching a newline, end this loop if the physical line does not | |
3920 | start with '#'. If it does, it's a comment, and the loop continues. */ | |
3921 | ||
3922 | if (*yield != '#') break; | |
3923 | } | |
3924 | ||
3925 | /* This loop handles continuations. We know we have some real data, ending in | |
3926 | newline. See if there is a continuation marker at the end (ignoring trailing | |
3927 | white space). We know that *yield is not white space, so no need to test for | |
3928 | cont > yield in the backwards scanning loop. */ | |
3929 | ||
3930 | for(;;) | |
3931 | { | |
3932 | uschar *cont; | |
3933 | for (cont = acl_text - 1; isspace(*cont); cont--); | |
3934 | ||
3935 | /* If no continuation follows, we are done. Mark the end of the line and | |
3936 | return it. */ | |
3937 | ||
3938 | if (*cont != '\\') | |
3939 | { | |
3940 | *acl_text++ = 0; | |
3941 | return yield; | |
3942 | } | |
3943 | ||
3944 | /* We have encountered a continuation. Skip over whitespace at the start of | |
3945 | the next line, and indeed the whole of the next line or lines if they are | |
3946 | comment lines. */ | |
3947 | ||
3948 | for (;;) | |
3949 | { | |
3950 | while (*(++acl_text) == ' ' || *acl_text == '\t'); | |
3951 | if (*acl_text != '#') break; | |
3952 | while (*(++acl_text) != 0 && *acl_text != '\n'); | |
3953 | } | |
3954 | ||
3955 | /* We have the start of a continuation line. Move all the rest of the data | |
3956 | to join onto the previous line, and then find its end. If the end is not a | |
3957 | newline, we are done. Otherwise loop to look for another continuation. */ | |
3958 | ||
3959 | memmove(cont, acl_text, acl_text_end - acl_text); | |
3960 | acl_text_end -= acl_text - cont; | |
3961 | acl_text = cont; | |
3962 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3963 | if (*acl_text == 0) return yield; | |
3964 | } | |
3965 | ||
3966 | /* Control does not reach here */ | |
3967 | } | |
3968 | ||
3969 | ||
3970 | ||
3971 | ||
3972 | ||
3973 | /************************************************* | |
3974 | * Check access using an ACL * | |
3975 | *************************************************/ | |
3976 | ||
3977 | /* This function is called from address_check. It may recurse via | |
3978 | acl_check_condition() - hence the use of a level to stop looping. The ACL is | |
3979 | passed as a string which is expanded. A forced failure implies no access check | |
3980 | is required. If the result is a single word, it is taken as the name of an ACL | |
3981 | which is sought in the global ACL tree. Otherwise, it is taken as literal ACL | |
3982 | text, complete with newlines, and parsed as such. In both cases, the ACL check | |
3983 | is then run. This function uses an auxiliary function for acl_read() to call | |
3984 | for reading individual lines of a literal ACL. This is acl_getline(), which | |
3985 | appears immediately above. | |
3986 | ||
3987 | Arguments: | |
3988 | where where called from | |
3989 | addr address item when called from RCPT; otherwise NULL | |
3990 | s the input string; NULL is the same as an empty ACL => DENY | |
3991 | level the nesting level | |
3992 | user_msgptr where to put a user error (for SMTP response) | |
3993 | log_msgptr where to put a logging message (not for SMTP response) | |
3994 | ||
3995 | Returns: OK access is granted | |
3996 | DISCARD access is apparently granted... | |
3997 | FAIL access is denied | |
3998 | FAIL_DROP access is denied; drop the connection | |
3999 | DEFER can't tell at the moment | |
4000 | ERROR disaster | |
4001 | */ | |
4002 | ||
4003 | static int | |
4004 | acl_check_internal(int where, address_item *addr, uschar *s, int level, | |
4005 | uschar **user_msgptr, uschar **log_msgptr) | |
4006 | { | |
4007 | int fd = -1; | |
4008 | acl_block *acl = NULL; | |
4009 | uschar *acl_name = US"inline ACL"; | |
4010 | uschar *ss; | |
4011 | ||
4012 | /* Catch configuration loops */ | |
4013 | ||
4014 | if (level > 20) | |
4015 | { | |
4016 | *log_msgptr = US"ACL nested too deep: possible loop"; | |
4017 | return ERROR; | |
4018 | } | |
4019 | ||
4020 | if (s == NULL) | |
4021 | { | |
4022 | HDEBUG(D_acl) debug_printf("ACL is NULL: implicit DENY\n"); | |
4023 | return FAIL; | |
4024 | } | |
4025 | ||
4026 | /* At top level, we expand the incoming string. At lower levels, it has already | |
4027 | been expanded as part of condition processing. */ | |
4028 | ||
4029 | if (level == 0) | |
4030 | { | |
4031 | ss = expand_string(s); | |
4032 | if (ss == NULL) | |
4033 | { | |
4034 | if (expand_string_forcedfail) return OK; | |
4035 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s, | |
4036 | expand_string_message); | |
4037 | return ERROR; | |
4038 | } | |
4039 | } | |
4040 | else ss = s; | |
4041 | ||
4042 | while (isspace(*ss))ss++; | |
4043 | ||
4044 | /* If we can't find a named ACL, the default is to parse it as an inline one. | |
4045 | (Unless it begins with a slash; non-existent files give rise to an error.) */ | |
4046 | ||
4047 | acl_text = ss; | |
4048 | ||
4049 | /* Handle the case of a string that does not contain any spaces. Look for a | |
4050 | named ACL among those read from the configuration, or a previously read file. | |
4051 | It is possible that the pointer to the ACL is NULL if the configuration | |
4052 | contains a name with no data. If not found, and the text begins with '/', | |
4053 | read an ACL from a file, and save it so it can be re-used. */ | |
4054 | ||
4055 | if (Ustrchr(ss, ' ') == NULL) | |
4056 | { | |
4057 | tree_node *t = tree_search(acl_anchor, ss); | |
4058 | if (t != NULL) | |
4059 | { | |
4060 | acl = (acl_block *)(t->data.ptr); | |
4061 | if (acl == NULL) | |
4062 | { | |
4063 | HDEBUG(D_acl) debug_printf("ACL \"%s\" is empty: implicit DENY\n", ss); | |
4064 | return FAIL; | |
4065 | } | |
4066 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
4067 | HDEBUG(D_acl) debug_printf("using ACL \"%s\"\n", ss); | |
4068 | } | |
4069 | ||
4070 | else if (*ss == '/') | |
4071 | { | |
4072 | struct stat statbuf; | |
4073 | fd = Uopen(ss, O_RDONLY, 0); | |
4074 | if (fd < 0) | |
4075 | { | |
4076 | *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss, | |
4077 | strerror(errno)); | |
4078 | return ERROR; | |
4079 | } | |
4080 | ||
4081 | if (fstat(fd, &statbuf) != 0) | |
4082 | { | |
4083 | *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss, | |
4084 | strerror(errno)); | |
4085 | return ERROR; | |
4086 | } | |
4087 | ||
4088 | acl_text = store_get(statbuf.st_size + 1); | |
4089 | acl_text_end = acl_text + statbuf.st_size + 1; | |
4090 | ||
4091 | if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size) | |
4092 | { | |
4093 | *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s", | |
4094 | ss, strerror(errno)); | |
4095 | return ERROR; | |
4096 | } | |
4097 | acl_text[statbuf.st_size] = 0; | |
f1e894f3 | 4098 | (void)close(fd); |
059ec3d9 PH |
4099 | |
4100 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
4101 | HDEBUG(D_acl) debug_printf("read ACL from file %s\n", ss); | |
4102 | } | |
4103 | } | |
4104 | ||
4105 | /* Parse an ACL that is still in text form. If it came from a file, remember it | |
4106 | in the ACL tree, having read it into the POOL_PERM store pool so that it | |
4107 | persists between multiple messages. */ | |
4108 | ||
4109 | if (acl == NULL) | |
4110 | { | |
4111 | int old_pool = store_pool; | |
4112 | if (fd >= 0) store_pool = POOL_PERM; | |
4113 | acl = acl_read(acl_getline, log_msgptr); | |
4114 | store_pool = old_pool; | |
4115 | if (acl == NULL && *log_msgptr != NULL) return ERROR; | |
4116 | if (fd >= 0) | |
4117 | { | |
4118 | tree_node *t = store_get_perm(sizeof(tree_node) + Ustrlen(ss)); | |
4119 | Ustrcpy(t->name, ss); | |
4120 | t->data.ptr = acl; | |
4121 | (void)tree_insertnode(&acl_anchor, t); | |
4122 | } | |
4123 | } | |
4124 | ||
4125 | /* Now we have an ACL to use. It's possible it may be NULL. */ | |
4126 | ||
4127 | while (acl != NULL) | |
4128 | { | |
4129 | int cond; | |
4130 | int basic_errno = 0; | |
4131 | BOOL endpass_seen = FALSE; | |
82c0c8ea JH |
4132 | BOOL acl_quit_check = level == 0 |
4133 | && (where == ACL_WHERE_QUIT || where == ACL_WHERE_NOTQUIT); | |
059ec3d9 PH |
4134 | |
4135 | *log_msgptr = *user_msgptr = NULL; | |
4136 | acl_temp_details = FALSE; | |
4137 | ||
059ec3d9 PH |
4138 | HDEBUG(D_acl) debug_printf("processing \"%s\"\n", verbs[acl->verb]); |
4139 | ||
4140 | /* Clear out any search error message from a previous check before testing | |
4141 | this condition. */ | |
4142 | ||
4143 | search_error_message = NULL; | |
4144 | cond = acl_check_condition(acl->verb, acl->condition, where, addr, level, | |
4145 | &endpass_seen, user_msgptr, log_msgptr, &basic_errno); | |
4146 | ||
4147 | /* Handle special returns: DEFER causes a return except on a WARN verb; | |
4148 | ERROR always causes a return. */ | |
4149 | ||
4150 | switch (cond) | |
4151 | { | |
4152 | case DEFER: | |
6968512f | 4153 | HDEBUG(D_acl) debug_printf("%s: condition test deferred in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4154 | if (basic_errno != ERRNO_CALLOUTDEFER) |
4155 | { | |
4156 | if (search_error_message != NULL && *search_error_message != 0) | |
4157 | *log_msgptr = search_error_message; | |
4158 | if (smtp_return_error_details) acl_temp_details = TRUE; | |
4159 | } | |
4160 | else | |
4161 | { | |
4162 | acl_temp_details = TRUE; | |
4163 | } | |
4164 | if (acl->verb != ACL_WARN) return DEFER; | |
4165 | break; | |
4166 | ||
4167 | default: /* Paranoia */ | |
4168 | case ERROR: | |
6968512f | 4169 | HDEBUG(D_acl) debug_printf("%s: condition test error in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4170 | return ERROR; |
4171 | ||
4172 | case OK: | |
6968512f JH |
4173 | HDEBUG(D_acl) debug_printf("%s: condition test succeeded in %s\n", |
4174 | verbs[acl->verb], acl_name); | |
059ec3d9 PH |
4175 | break; |
4176 | ||
4177 | case FAIL: | |
6968512f | 4178 | HDEBUG(D_acl) debug_printf("%s: condition test failed in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4179 | break; |
4180 | ||
4181 | /* DISCARD and DROP can happen only from a nested ACL condition, and | |
4182 | DISCARD can happen only for an "accept" or "discard" verb. */ | |
4183 | ||
4184 | case DISCARD: | |
6968512f JH |
4185 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"discard\" in %s\n", |
4186 | verbs[acl->verb], acl_name); | |
059ec3d9 PH |
4187 | break; |
4188 | ||
4189 | case FAIL_DROP: | |
6968512f JH |
4190 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"drop\" in %s\n", |
4191 | verbs[acl->verb], acl_name); | |
059ec3d9 PH |
4192 | break; |
4193 | } | |
4194 | ||
4195 | /* At this point, cond for most verbs is either OK or FAIL or (as a result of | |
4196 | a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and | |
4197 | for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */ | |
4198 | ||
4199 | switch(acl->verb) | |
4200 | { | |
4201 | case ACL_ACCEPT: | |
a7538db1 JH |
4202 | if (cond == OK || cond == DISCARD) |
4203 | { | |
4204 | HDEBUG(D_acl) debug_printf("end of %s: ACCEPT\n", acl_name); | |
4205 | return cond; | |
4206 | } | |
059ec3d9 PH |
4207 | if (endpass_seen) |
4208 | { | |
4209 | HDEBUG(D_acl) debug_printf("accept: endpass encountered - denying access\n"); | |
4210 | return cond; | |
4211 | } | |
4212 | break; | |
4213 | ||
4214 | case ACL_DEFER: | |
4215 | if (cond == OK) | |
4216 | { | |
a7538db1 | 4217 | HDEBUG(D_acl) debug_printf("end of %s: DEFER\n", acl_name); |
82c0c8ea | 4218 | if (acl_quit_check) goto badquit; |
059ec3d9 PH |
4219 | acl_temp_details = TRUE; |
4220 | return DEFER; | |
4221 | } | |
4222 | break; | |
4223 | ||
4224 | case ACL_DENY: | |
a7538db1 JH |
4225 | if (cond == OK) |
4226 | { | |
4227 | HDEBUG(D_acl) debug_printf("end of %s: DENY\n", acl_name); | |
82c0c8ea | 4228 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4229 | return FAIL; |
4230 | } | |
059ec3d9 PH |
4231 | break; |
4232 | ||
4233 | case ACL_DISCARD: | |
a7538db1 JH |
4234 | if (cond == OK || cond == DISCARD) |
4235 | { | |
4236 | HDEBUG(D_acl) debug_printf("end of %s: DISCARD\n", acl_name); | |
82c0c8ea | 4237 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4238 | return DISCARD; |
4239 | } | |
059ec3d9 PH |
4240 | if (endpass_seen) |
4241 | { | |
4242 | HDEBUG(D_acl) debug_printf("discard: endpass encountered - denying access\n"); | |
4243 | return cond; | |
4244 | } | |
4245 | break; | |
4246 | ||
4247 | case ACL_DROP: | |
a7538db1 JH |
4248 | if (cond == OK) |
4249 | { | |
4250 | HDEBUG(D_acl) debug_printf("end of %s: DROP\n", acl_name); | |
82c0c8ea | 4251 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4252 | return FAIL_DROP; |
4253 | } | |
059ec3d9 PH |
4254 | break; |
4255 | ||
4256 | case ACL_REQUIRE: | |
a7538db1 JH |
4257 | if (cond != OK) |
4258 | { | |
4259 | HDEBUG(D_acl) debug_printf("end of %s: not OK\n", acl_name); | |
82c0c8ea | 4260 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4261 | return cond; |
4262 | } | |
059ec3d9 PH |
4263 | break; |
4264 | ||
4265 | case ACL_WARN: | |
4266 | if (cond == OK) | |
4267 | acl_warn(where, *user_msgptr, *log_msgptr); | |
49826d12 | 4268 | else if (cond == DEFER && (log_extra_selector & LX_acl_warn_skipped) != 0) |
9c7a242c PH |
4269 | log_write(0, LOG_MAIN, "%s Warning: ACL \"warn\" statement skipped: " |
4270 | "condition test deferred%s%s", host_and_ident(TRUE), | |
4271 | (*log_msgptr == NULL)? US"" : US": ", | |
4272 | (*log_msgptr == NULL)? US"" : *log_msgptr); | |
059ec3d9 PH |
4273 | *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */ |
4274 | break; | |
4275 | ||
4276 | default: | |
4277 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d", | |
4278 | acl->verb); | |
4279 | break; | |
4280 | } | |
4281 | ||
4282 | /* Pass to the next ACL item */ | |
4283 | ||
4284 | acl = acl->next; | |
4285 | } | |
4286 | ||
4287 | /* We have reached the end of the ACL. This is an implicit DENY. */ | |
4288 | ||
4289 | HDEBUG(D_acl) debug_printf("end of %s: implicit DENY\n", acl_name); | |
4290 | return FAIL; | |
82c0c8ea JH |
4291 | |
4292 | badquit: | |
4293 | *log_msgptr = string_sprintf("QUIT or not-QUIT teplevel ACL may not fail " | |
4294 | "('%s' verb used incorrectly)", verbs[acl->verb]); | |
4295 | return ERROR; | |
059ec3d9 PH |
4296 | } |
4297 | ||
4298 | ||
333eea9c JH |
4299 | |
4300 | ||
4301 | /* Same args as acl_check_internal() above, but the string s is | |
4302 | the name of an ACL followed optionally by up to 9 space-separated arguments. | |
4303 | The name and args are separately expanded. Args go into $acl_arg globals. */ | |
f60d98e8 | 4304 | static int |
55414b25 | 4305 | acl_check_wargs(int where, address_item *addr, const uschar *s, int level, |
333eea9c JH |
4306 | uschar **user_msgptr, uschar **log_msgptr) |
4307 | { | |
4308 | uschar * tmp; | |
bef3ea7f | 4309 | uschar * tmp_arg[9]; /* must match acl_arg[] */ |
ef21c07d JH |
4310 | uschar * sav_arg[9]; /* must match acl_arg[] */ |
4311 | int sav_narg; | |
333eea9c | 4312 | uschar * name; |
bef3ea7f | 4313 | int i; |
ef21c07d | 4314 | int ret; |
333eea9c JH |
4315 | |
4316 | if (!(tmp = string_dequote(&s)) || !(name = expand_string(tmp))) | |
4317 | goto bad; | |
4318 | ||
bef3ea7f | 4319 | for (i = 0; i < 9; i++) |
333eea9c JH |
4320 | { |
4321 | while (*s && isspace(*s)) s++; | |
4322 | if (!*s) break; | |
bef3ea7f | 4323 | if (!(tmp = string_dequote(&s)) || !(tmp_arg[i] = expand_string(tmp))) |
333eea9c JH |
4324 | { |
4325 | tmp = name; | |
4326 | goto bad; | |
4327 | } | |
4328 | } | |
ef21c07d JH |
4329 | |
4330 | sav_narg = acl_narg; | |
bef3ea7f | 4331 | acl_narg = i; |
ef21c07d JH |
4332 | for (i = 0; i < acl_narg; i++) |
4333 | { | |
4334 | sav_arg[i] = acl_arg[i]; | |
4335 | acl_arg[i] = tmp_arg[i]; | |
4336 | } | |
4337 | while (i < 9) | |
4338 | { | |
4339 | sav_arg[i] = acl_arg[i]; | |
4340 | acl_arg[i++] = NULL; | |
4341 | } | |
4342 | ||
4343 | ret = acl_check_internal(where, addr, name, level, user_msgptr, log_msgptr); | |
333eea9c | 4344 | |
ef21c07d JH |
4345 | acl_narg = sav_narg; |
4346 | for (i = 0; i < 9; i++) acl_arg[i] = sav_arg[i]; | |
4347 | return ret; | |
333eea9c JH |
4348 | |
4349 | bad: | |
4350 | if (expand_string_forcedfail) return ERROR; | |
4351 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
4352 | tmp, expand_string_message); | |
4353 | return search_find_defer?DEFER:ERROR; | |
4354 | } | |
4355 | ||
4356 | ||
4357 | ||
059ec3d9 PH |
4358 | /************************************************* |
4359 | * Check access using an ACL * | |
4360 | *************************************************/ | |
4361 | ||
faa05a93 JH |
4362 | /* Alternate interface for ACL, used by expansions */ |
4363 | int | |
05caaeaa | 4364 | acl_eval(int where, uschar *s, uschar **user_msgptr, uschar **log_msgptr) |
faa05a93 | 4365 | { |
faa05a93 JH |
4366 | address_item adb; |
4367 | address_item *addr = NULL; | |
4368 | ||
4369 | *user_msgptr = *log_msgptr = NULL; | |
4370 | sender_verified_failed = NULL; | |
4371 | ratelimiters_cmd = NULL; | |
4372 | log_reject_target = LOG_MAIN|LOG_REJECT; | |
4373 | ||
4374 | if (where == ACL_WHERE_RCPT) | |
4375 | { | |
4376 | adb = address_defaults; | |
4377 | addr = &adb; | |
05caaeaa JH |
4378 | addr->address = expand_string(US"$local_part@$domain"); |
4379 | addr->domain = deliver_domain; | |
4380 | addr->local_part = deliver_localpart; | |
4381 | addr->cc_local_part = deliver_localpart; | |
4382 | addr->lc_local_part = deliver_localpart; | |
faa05a93 JH |
4383 | } |
4384 | ||
4385 | return acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr); | |
4386 | } | |
4387 | ||
4388 | ||
4389 | ||
059ec3d9 PH |
4390 | /* This is the external interface for ACL checks. It sets up an address and the |
4391 | expansions for $domain and $local_part when called after RCPT, then calls | |
4392 | acl_check_internal() to do the actual work. | |
4393 | ||
4394 | Arguments: | |
4395 | where ACL_WHERE_xxxx indicating where called from | |
64ffc24f | 4396 | recipient RCPT address for RCPT check, else NULL |
059ec3d9 PH |
4397 | s the input string; NULL is the same as an empty ACL => DENY |
4398 | user_msgptr where to put a user error (for SMTP response) | |
4399 | log_msgptr where to put a logging message (not for SMTP response) | |
4400 | ||
4401 | Returns: OK access is granted by an ACCEPT verb | |
4402 | DISCARD access is granted by a DISCARD verb | |
4403 | FAIL access is denied | |
4404 | FAIL_DROP access is denied; drop the connection | |
4405 | DEFER can't tell at the moment | |
4406 | ERROR disaster | |
4407 | */ | |
faa05a93 | 4408 | int acl_where = ACL_WHERE_UNKNOWN; |
059ec3d9 PH |
4409 | |
4410 | int | |
64ffc24f | 4411 | acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr, |
059ec3d9 PH |
4412 | uschar **log_msgptr) |
4413 | { | |
4414 | int rc; | |
4415 | address_item adb; | |
64ffc24f | 4416 | address_item *addr = NULL; |
059ec3d9 PH |
4417 | |
4418 | *user_msgptr = *log_msgptr = NULL; | |
4419 | sender_verified_failed = NULL; | |
fe0dab11 | 4420 | ratelimiters_cmd = NULL; |
6ea85e9a | 4421 | log_reject_target = LOG_MAIN|LOG_REJECT; |
059ec3d9 | 4422 | |
8ccd00b1 | 4423 | #ifndef DISABLE_PRDR |
5032d1cf | 4424 | if (where == ACL_WHERE_RCPT || where == ACL_WHERE_PRDR) |
fd98a5c6 | 4425 | #else |
5032d1cf | 4426 | if (where == ACL_WHERE_RCPT) |
fd98a5c6 | 4427 | #endif |
059ec3d9 PH |
4428 | { |
4429 | adb = address_defaults; | |
4430 | addr = &adb; | |
64ffc24f | 4431 | addr->address = recipient; |
059ec3d9 PH |
4432 | if (deliver_split_address(addr) == DEFER) |
4433 | { | |
4434 | *log_msgptr = US"defer in percent_hack_domains check"; | |
4435 | return DEFER; | |
4436 | } | |
9bfc60eb | 4437 | #ifdef EXPERIMENTAL_INTERNATIONAL |
3c8b3577 JH |
4438 | if ((addr->prop.utf8_msg = message_smtputf8)) |
4439 | { | |
4440 | addr->prop.utf8_downcvt = message_utf8_downconvert == 1; | |
4441 | addr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1; | |
4442 | } | |
9bfc60eb | 4443 | #endif |
059ec3d9 PH |
4444 | deliver_domain = addr->domain; |
4445 | deliver_localpart = addr->local_part; | |
4446 | } | |
059ec3d9 | 4447 | |
faa05a93 | 4448 | acl_where = where; |
059ec3d9 | 4449 | rc = acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr); |
faa05a93 | 4450 | acl_where = ACL_WHERE_UNKNOWN; |
059ec3d9 | 4451 | |
817d9f57 JH |
4452 | /* Cutthrough - if requested, |
4453 | and WHERE_RCPT and not yet opened conn as result of recipient-verify, | |
4454 | and rcpt acl returned accept, | |
4455 | and first recipient (cancel on any subsequents) | |
e4bdf652 | 4456 | open one now and run it up to RCPT acceptance. |
e4bdf652 | 4457 | A failed verify should cancel cutthrough request. |
e4bdf652 | 4458 | |
817d9f57 | 4459 | Initial implementation: dual-write to spool. |
e4bdf652 JH |
4460 | Assume the rxd datastream is now being copied byte-for-byte to an open cutthrough connection. |
4461 | ||
4462 | Cease cutthrough copy on rxd final dot; do not send one. | |
4463 | ||
4464 | On a data acl, if not accept and a cutthrough conn is open, hard-close it (no SMTP niceness). | |
4465 | ||
4466 | On data acl accept, terminate the dataphase on an open cutthrough conn. If accepted or | |
4467 | perm-rejected, reflect that to the original sender - and dump the spooled copy. | |
4468 | If temp-reject, close the conn (and keep the spooled copy). | |
4469 | If conn-failure, no action (and keep the spooled copy). | |
e4bdf652 JH |
4470 | */ |
4471 | switch (where) | |
4472 | { | |
4473 | case ACL_WHERE_RCPT: | |
8ccd00b1 | 4474 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
4475 | case ACL_WHERE_PRDR: |
4476 | #endif | |
5032d1cf | 4477 | if (rc == OK && cutthrough.delivery && rcpt_count > cutthrough.nrcpt) |
e4bdf652 JH |
4478 | open_cutthrough_connection(addr); |
4479 | break; | |
4480 | ||
4481 | case ACL_WHERE_PREDATA: | |
4482 | if( rc == OK ) | |
4483 | cutthrough_predata(); | |
4484 | else | |
2e5b33cd | 4485 | cancel_cutthrough_connection("predata acl not ok"); |
e4bdf652 JH |
4486 | break; |
4487 | ||
4488 | case ACL_WHERE_QUIT: | |
4489 | case ACL_WHERE_NOTQUIT: | |
2e5b33cd | 4490 | cancel_cutthrough_connection("quit or notquit"); |
e4bdf652 JH |
4491 | break; |
4492 | ||
4493 | default: | |
4494 | break; | |
4495 | } | |
4496 | ||
64ffc24f PH |
4497 | deliver_domain = deliver_localpart = deliver_address_data = |
4498 | sender_address_data = NULL; | |
059ec3d9 PH |
4499 | |
4500 | /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA | |
4501 | ACL, which is really in the middle of an SMTP command. */ | |
4502 | ||
4503 | if (rc == DISCARD) | |
4504 | { | |
4505 | if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA) | |
4506 | { | |
4507 | log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s " | |
4508 | "ACL", acl_wherenames[where]); | |
4509 | return ERROR; | |
4510 | } | |
4511 | return DISCARD; | |
4512 | } | |
4513 | ||
4514 | /* A DROP response is not permitted from MAILAUTH */ | |
4515 | ||
4516 | if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH) | |
4517 | { | |
4518 | log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s " | |
4519 | "ACL", acl_wherenames[where]); | |
4520 | return ERROR; | |
4521 | } | |
4522 | ||
4e88a19f PH |
4523 | /* Before giving a response, take a look at the length of any user message, and |
4524 | split it up into multiple lines if possible. */ | |
059ec3d9 | 4525 | |
e28326d8 PH |
4526 | *user_msgptr = string_split_message(*user_msgptr); |
4527 | if (fake_response != OK) | |
4528 | fake_response_text = string_split_message(fake_response_text); | |
059ec3d9 PH |
4529 | |
4530 | return rc; | |
4531 | } | |
4532 | ||
38a0a95f | 4533 | |
38a0a95f PH |
4534 | /************************************************* |
4535 | * Create ACL variable * | |
4536 | *************************************************/ | |
4537 | ||
4538 | /* Create an ACL variable or reuse an existing one. ACL variables are in a | |
4539 | binary tree (see tree.c) with acl_var_c and acl_var_m as root nodes. | |
4540 | ||
4541 | Argument: | |
4542 | name pointer to the variable's name, starting with c or m | |
4543 | ||
4544 | Returns the pointer to variable's tree node | |
4545 | */ | |
4546 | ||
4547 | tree_node * | |
4548 | acl_var_create(uschar *name) | |
4549 | { | |
4550 | tree_node *node, **root; | |
4551 | root = (name[0] == 'c')? &acl_var_c : &acl_var_m; | |
4552 | node = tree_search(*root, name); | |
4553 | if (node == NULL) | |
4554 | { | |
4555 | node = store_get(sizeof(tree_node) + Ustrlen(name)); | |
4556 | Ustrcpy(node->name, name); | |
4557 | (void)tree_insertnode(root, node); | |
4558 | } | |
4559 | node->data.ptr = NULL; | |
4560 | return node; | |
4561 | } | |
4562 | ||
4563 | ||
4564 | ||
4565 | /************************************************* | |
4566 | * Write an ACL variable in spool format * | |
4567 | *************************************************/ | |
4568 | ||
4569 | /* This function is used as a callback for tree_walk when writing variables to | |
4570 | the spool file. To retain spool file compatibility, what is written is -aclc or | |
4571 | -aclm followed by the rest of the name and the data length, space separated, | |
4572 | then the value itself, starting on a new line, and terminated by an additional | |
4573 | newline. When we had only numbered ACL variables, the first line might look | |
4574 | like this: "-aclc 5 20". Now it might be "-aclc foo 20" for the variable called | |
4575 | acl_cfoo. | |
4576 | ||
4577 | Arguments: | |
4578 | name of the variable | |
4579 | value of the variable | |
4580 | ctx FILE pointer (as a void pointer) | |
4581 | ||
4582 | Returns: nothing | |
4583 | */ | |
4584 | ||
4585 | void | |
4586 | acl_var_write(uschar *name, uschar *value, void *ctx) | |
4587 | { | |
4588 | FILE *f = (FILE *)ctx; | |
4589 | fprintf(f, "-acl%c %s %d\n%s\n", name[0], name+1, Ustrlen(value), value); | |
4590 | } | |
4591 | ||
9171d434 JH |
4592 | /* vi: aw ai sw=2 |
4593 | */ | |
059ec3d9 | 4594 | /* End of acl.c */ |