Commit | Line | Data |
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71fafd95 | 1 | /* $Cambridge: exim/src/src/acl.c,v 1.57 2006/03/06 16:05:12 ph10 Exp $ */ |
059ec3d9 PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
d7d7b7b9 | 7 | /* Copyright (c) University of Cambridge 1995 - 2006 */ |
059ec3d9 PH |
8 | /* See the file NOTICE for conditions of use and distribution. */ |
9 | ||
10 | /* Code for handling Access Control Lists (ACLs) */ | |
11 | ||
12 | #include "exim.h" | |
13 | ||
14 | ||
15 | /* Default callout timeout */ | |
16 | ||
17 | #define CALLOUT_TIMEOUT_DEFAULT 30 | |
18 | ||
19 | /* ACL verb codes - keep in step with the table of verbs that follows */ | |
20 | ||
21 | enum { ACL_ACCEPT, ACL_DEFER, ACL_DENY, ACL_DISCARD, ACL_DROP, ACL_REQUIRE, | |
22 | ACL_WARN }; | |
23 | ||
24 | /* ACL verbs */ | |
25 | ||
26 | static uschar *verbs[] = | |
27 | { US"accept", US"defer", US"deny", US"discard", US"drop", US"require", | |
28 | US"warn" }; | |
29 | ||
30 | /* For each verb, the condition for which "message" is used */ | |
31 | ||
32 | static int msgcond[] = { FAIL, OK, OK, FAIL, OK, FAIL, OK }; | |
33 | ||
34 | /* ACL condition and modifier codes - keep in step with the table that | |
71fafd95 PH |
35 | follows, and the cond_expand_at_top and uschar cond_modifiers tables lower |
36 | down. */ | |
059ec3d9 | 37 | |
71fafd95 PH |
38 | enum { ACLC_ACL, |
39 | ACLC_ADD_HEADER, | |
40 | ACLC_AUTHENTICATED, | |
8523533c TK |
41 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
42 | ACLC_BMI_OPTIN, | |
43 | #endif | |
71fafd95 PH |
44 | ACLC_CONDITION, |
45 | ACLC_CONTROL, | |
8523533c TK |
46 | #ifdef WITH_CONTENT_SCAN |
47 | ACLC_DECODE, | |
48 | #endif | |
49 | ACLC_DELAY, | |
50 | #ifdef WITH_OLD_DEMIME | |
51 | ACLC_DEMIME, | |
fb2274d4 TK |
52 | #endif |
53 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
54 | ACLC_DK_DOMAIN_SOURCE, | |
55 | ACLC_DK_POLICY, | |
56 | ACLC_DK_SENDER_DOMAINS, | |
57 | ACLC_DK_SENDER_LOCAL_PARTS, | |
58 | ACLC_DK_SENDERS, | |
59 | ACLC_DK_STATUS, | |
8e669ac1 | 60 | #endif |
71fafd95 PH |
61 | ACLC_DNSLISTS, |
62 | ACLC_DOMAINS, | |
63 | ACLC_ENCRYPTED, | |
64 | ACLC_ENDPASS, | |
65 | ACLC_HOSTS, | |
66 | ACLC_LOCAL_PARTS, | |
67 | ACLC_LOG_MESSAGE, | |
68 | ACLC_LOGWRITE, | |
8523533c TK |
69 | #ifdef WITH_CONTENT_SCAN |
70 | ACLC_MALWARE, | |
71 | #endif | |
72 | ACLC_MESSAGE, | |
73 | #ifdef WITH_CONTENT_SCAN | |
74 | ACLC_MIME_REGEX, | |
75 | #endif | |
870f6ba8 | 76 | ACLC_RATELIMIT, |
8523533c TK |
77 | ACLC_RECIPIENTS, |
78 | #ifdef WITH_CONTENT_SCAN | |
79 | ACLC_REGEX, | |
80 | #endif | |
71fafd95 PH |
81 | ACLC_SENDER_DOMAINS, |
82 | ACLC_SENDERS, | |
83 | ACLC_SET, | |
8523533c | 84 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 85 | ACLC_SPAM, |
8523533c TK |
86 | #endif |
87 | #ifdef EXPERIMENTAL_SPF | |
88 | ACLC_SPF, | |
89 | #endif | |
90 | ACLC_VERIFY }; | |
059ec3d9 PH |
91 | |
92 | /* ACL conditions/modifiers: "delay", "control", "endpass", "message", | |
93 | "log_message", "logwrite", and "set" are modifiers that look like conditions | |
94 | but always return TRUE. They are used for their side effects. */ | |
95 | ||
9a26b6b2 PH |
96 | static uschar *conditions[] = { |
97 | US"acl", | |
71fafd95 | 98 | US"add_header", |
9a26b6b2 | 99 | US"authenticated", |
8523533c TK |
100 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
101 | US"bmi_optin", | |
102 | #endif | |
103 | US"condition", | |
8e669ac1 | 104 | US"control", |
8523533c TK |
105 | #ifdef WITH_CONTENT_SCAN |
106 | US"decode", | |
107 | #endif | |
108 | US"delay", | |
109 | #ifdef WITH_OLD_DEMIME | |
110 | US"demime", | |
fb2274d4 TK |
111 | #endif |
112 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
7f45268c PH |
113 | US"dk_domain_source", |
114 | US"dk_policy", | |
115 | US"dk_sender_domains", | |
116 | US"dk_sender_local_parts", | |
117 | US"dk_senders", | |
118 | US"dk_status", | |
8523533c TK |
119 | #endif |
120 | US"dnslists", US"domains", US"encrypted", | |
059ec3d9 | 121 | US"endpass", US"hosts", US"local_parts", US"log_message", US"logwrite", |
8523533c TK |
122 | #ifdef WITH_CONTENT_SCAN |
123 | US"malware", | |
124 | #endif | |
125 | US"message", | |
126 | #ifdef WITH_CONTENT_SCAN | |
127 | US"mime_regex", | |
128 | #endif | |
870f6ba8 | 129 | US"ratelimit", |
8523533c TK |
130 | US"recipients", |
131 | #ifdef WITH_CONTENT_SCAN | |
132 | US"regex", | |
133 | #endif | |
134 | US"sender_domains", US"senders", US"set", | |
135 | #ifdef WITH_CONTENT_SCAN | |
136 | US"spam", | |
137 | #endif | |
138 | #ifdef EXPERIMENTAL_SPF | |
139 | US"spf", | |
140 | #endif | |
059ec3d9 | 141 | US"verify" }; |
8e669ac1 | 142 | |
c5fcb476 | 143 | |
9a26b6b2 PH |
144 | /* Return values from decode_control(); keep in step with the table of names |
145 | that follows! */ | |
146 | ||
147 | enum { | |
c46782ef PH |
148 | CONTROL_AUTH_UNADVERTISED, |
149 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
9a26b6b2 | 150 | CONTROL_BMI_RUN, |
c46782ef PH |
151 | #endif |
152 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
9a26b6b2 | 153 | CONTROL_DK_VERIFY, |
c46782ef PH |
154 | #endif |
155 | CONTROL_ERROR, | |
156 | CONTROL_CASEFUL_LOCAL_PART, | |
157 | CONTROL_CASELOWER_LOCAL_PART, | |
158 | CONTROL_ENFORCE_SYNC, | |
159 | CONTROL_NO_ENFORCE_SYNC, | |
160 | CONTROL_FREEZE, | |
161 | CONTROL_QUEUE_ONLY, | |
162 | CONTROL_SUBMISSION, | |
163 | CONTROL_SUPPRESS_LOCAL_FIXUPS, | |
164 | #ifdef WITH_CONTENT_SCAN | |
9a26b6b2 | 165 | CONTROL_NO_MBOX_UNSPOOL, |
c46782ef PH |
166 | #endif |
167 | CONTROL_FAKEDEFER, | |
168 | CONTROL_FAKEREJECT, | |
169 | CONTROL_NO_MULTILINE | |
170 | }; | |
9a26b6b2 | 171 | |
8800895a PH |
172 | /* ACL control names; keep in step with the table above! This list is used for |
173 | turning ids into names. The actual list of recognized names is in the variable | |
174 | control_def controls_list[] below. The fact that there are two lists is a mess | |
175 | and should be tidied up. */ | |
9a26b6b2 PH |
176 | |
177 | static uschar *controls[] = { | |
c46782ef | 178 | US"allow_auth_unadvertised", |
9a26b6b2 PH |
179 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
180 | US"bmi_run", | |
181 | #endif | |
182 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
183 | US"dk_verify", | |
184 | #endif | |
c46782ef PH |
185 | US"error", |
186 | US"caseful_local_part", | |
187 | US"caselower_local_part", | |
188 | US"enforce_sync", | |
189 | US"no_enforce_sync", | |
190 | US"freeze", | |
191 | US"queue_only", | |
192 | US"submission", | |
193 | US"suppress_local_fixups", | |
9a26b6b2 PH |
194 | #ifdef WITH_CONTENT_SCAN |
195 | US"no_mbox_unspool", | |
196 | #endif | |
c46782ef PH |
197 | US"no_multiline" |
198 | }; | |
059ec3d9 PH |
199 | |
200 | /* Flags to indicate for which conditions /modifiers a string expansion is done | |
201 | at the outer level. In the other cases, expansion already occurs in the | |
202 | checking functions. */ | |
203 | ||
204 | static uschar cond_expand_at_top[] = { | |
71fafd95 | 205 | TRUE, /* add_header */ |
059ec3d9 PH |
206 | TRUE, /* acl */ |
207 | FALSE, /* authenticated */ | |
8523533c TK |
208 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
209 | TRUE, /* bmi_optin */ | |
8e669ac1 | 210 | #endif |
059ec3d9 PH |
211 | TRUE, /* condition */ |
212 | TRUE, /* control */ | |
8523533c TK |
213 | #ifdef WITH_CONTENT_SCAN |
214 | TRUE, /* decode */ | |
215 | #endif | |
059ec3d9 | 216 | TRUE, /* delay */ |
8523533c TK |
217 | #ifdef WITH_OLD_DEMIME |
218 | TRUE, /* demime */ | |
fb2274d4 TK |
219 | #endif |
220 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
7f45268c PH |
221 | TRUE, /* dk_domain_source */ |
222 | TRUE, /* dk_policy */ | |
223 | TRUE, /* dk_sender_domains */ | |
e715ad22 | 224 | TRUE, /* dk_sender_local_parts */ |
7f45268c PH |
225 | TRUE, /* dk_senders */ |
226 | TRUE, /* dk_status */ | |
8523533c | 227 | #endif |
059ec3d9 PH |
228 | TRUE, /* dnslists */ |
229 | FALSE, /* domains */ | |
230 | FALSE, /* encrypted */ | |
231 | TRUE, /* endpass */ | |
232 | FALSE, /* hosts */ | |
233 | FALSE, /* local_parts */ | |
234 | TRUE, /* log_message */ | |
235 | TRUE, /* logwrite */ | |
8523533c TK |
236 | #ifdef WITH_CONTENT_SCAN |
237 | TRUE, /* malware */ | |
238 | #endif | |
059ec3d9 | 239 | TRUE, /* message */ |
8523533c TK |
240 | #ifdef WITH_CONTENT_SCAN |
241 | TRUE, /* mime_regex */ | |
242 | #endif | |
870f6ba8 | 243 | TRUE, /* ratelimit */ |
059ec3d9 | 244 | FALSE, /* recipients */ |
8523533c TK |
245 | #ifdef WITH_CONTENT_SCAN |
246 | TRUE, /* regex */ | |
247 | #endif | |
059ec3d9 PH |
248 | FALSE, /* sender_domains */ |
249 | FALSE, /* senders */ | |
250 | TRUE, /* set */ | |
8523533c TK |
251 | #ifdef WITH_CONTENT_SCAN |
252 | TRUE, /* spam */ | |
253 | #endif | |
254 | #ifdef EXPERIMENTAL_SPF | |
255 | TRUE, /* spf */ | |
256 | #endif | |
059ec3d9 PH |
257 | TRUE /* verify */ |
258 | }; | |
259 | ||
260 | /* Flags to identify the modifiers */ | |
261 | ||
262 | static uschar cond_modifiers[] = { | |
71fafd95 | 263 | TRUE, /* add_header */ |
059ec3d9 PH |
264 | FALSE, /* acl */ |
265 | FALSE, /* authenticated */ | |
8523533c TK |
266 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
267 | TRUE, /* bmi_optin */ | |
8e669ac1 | 268 | #endif |
059ec3d9 PH |
269 | FALSE, /* condition */ |
270 | TRUE, /* control */ | |
8523533c TK |
271 | #ifdef WITH_CONTENT_SCAN |
272 | FALSE, /* decode */ | |
273 | #endif | |
059ec3d9 | 274 | TRUE, /* delay */ |
8523533c TK |
275 | #ifdef WITH_OLD_DEMIME |
276 | FALSE, /* demime */ | |
fb2274d4 TK |
277 | #endif |
278 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
7f45268c PH |
279 | FALSE, /* dk_domain_source */ |
280 | FALSE, /* dk_policy */ | |
281 | FALSE, /* dk_sender_domains */ | |
e715ad22 | 282 | FALSE, /* dk_sender_local_parts */ |
7f45268c PH |
283 | FALSE, /* dk_senders */ |
284 | FALSE, /* dk_status */ | |
8523533c | 285 | #endif |
059ec3d9 PH |
286 | FALSE, /* dnslists */ |
287 | FALSE, /* domains */ | |
288 | FALSE, /* encrypted */ | |
289 | TRUE, /* endpass */ | |
290 | FALSE, /* hosts */ | |
291 | FALSE, /* local_parts */ | |
292 | TRUE, /* log_message */ | |
8523533c TK |
293 | TRUE, /* logwrite */ |
294 | #ifdef WITH_CONTENT_SCAN | |
295 | FALSE, /* malware */ | |
296 | #endif | |
059ec3d9 | 297 | TRUE, /* message */ |
8523533c TK |
298 | #ifdef WITH_CONTENT_SCAN |
299 | FALSE, /* mime_regex */ | |
300 | #endif | |
870f6ba8 | 301 | FALSE, /* ratelimit */ |
059ec3d9 | 302 | FALSE, /* recipients */ |
8523533c TK |
303 | #ifdef WITH_CONTENT_SCAN |
304 | FALSE, /* regex */ | |
305 | #endif | |
059ec3d9 PH |
306 | FALSE, /* sender_domains */ |
307 | FALSE, /* senders */ | |
308 | TRUE, /* set */ | |
8523533c TK |
309 | #ifdef WITH_CONTENT_SCAN |
310 | FALSE, /* spam */ | |
311 | #endif | |
312 | #ifdef EXPERIMENTAL_SPF | |
313 | FALSE, /* spf */ | |
314 | #endif | |
059ec3d9 PH |
315 | FALSE /* verify */ |
316 | }; | |
317 | ||
c5fcb476 | 318 | /* Bit map vector of which conditions are not allowed at certain times. For |
2f079f46 PH |
319 | each condition, there's a bitmap of dis-allowed times. For some, it is easier |
320 | to specify the negation of a small number of allowed times. */ | |
059ec3d9 PH |
321 | |
322 | static unsigned int cond_forbids[] = { | |
323 | 0, /* acl */ | |
8e669ac1 | 324 | |
71fafd95 PH |
325 | (unsigned int) |
326 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* add_header */ | |
327 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
328 | (1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)), | |
329 | ||
059ec3d9 PH |
330 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_CONNECT)| /* authenticated */ |
331 | (1<<ACL_WHERE_HELO), | |
8e669ac1 | 332 | |
71fafd95 | 333 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
3864bb8e | 334 | (1<<ACL_WHERE_AUTH)| /* bmi_optin */ |
8523533c TK |
335 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
336 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_MIME)| | |
8e669ac1 | 337 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
8523533c TK |
338 | (1<<ACL_WHERE_MAILAUTH)| |
339 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
340 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_PREDATA), | |
71fafd95 | 341 | #endif |
8e669ac1 | 342 | |
059ec3d9 | 343 | 0, /* condition */ |
8e669ac1 | 344 | |
059ec3d9 | 345 | /* Certain types of control are always allowed, so we let it through |
2f079f46 | 346 | always and check in the control processing itself. */ |
8e669ac1 | 347 | |
059ec3d9 | 348 | 0, /* control */ |
8e669ac1 | 349 | |
71fafd95 | 350 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
351 | (unsigned int) |
352 | ~(1<<ACL_WHERE_MIME), /* decode */ | |
71fafd95 | 353 | #endif |
8523533c | 354 | |
059ec3d9 | 355 | 0, /* delay */ |
8e669ac1 | 356 | |
71fafd95 | 357 | #ifdef WITH_OLD_DEMIME |
2f079f46 PH |
358 | (unsigned int) |
359 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* demime */ | |
71fafd95 | 360 | #endif |
8e669ac1 | 361 | |
71fafd95 | 362 | #ifdef EXPERIMENTAL_DOMAINKEYS |
2f079f46 | 363 | (1<<ACL_WHERE_AUTH)| /* dk_domain_source */ |
fb2274d4 TK |
364 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
365 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
366 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
367 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
368 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
369 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 370 | |
2f079f46 | 371 | (1<<ACL_WHERE_AUTH)| /* dk_policy */ |
fb2274d4 TK |
372 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
373 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
374 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
375 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
376 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
377 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 378 | |
2f079f46 | 379 | (1<<ACL_WHERE_AUTH)| /* dk_sender_domains */ |
fb2274d4 TK |
380 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
381 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
382 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
383 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
384 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
385 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 386 | |
2f079f46 | 387 | (1<<ACL_WHERE_AUTH)| /* dk_sender_local_parts */ |
fb2274d4 TK |
388 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
389 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
390 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
391 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
392 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
393 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 394 | |
2f079f46 | 395 | (1<<ACL_WHERE_AUTH)| /* dk_senders */ |
fb2274d4 TK |
396 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
397 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
398 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
399 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
400 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
401 | (1<<ACL_WHERE_VRFY), | |
84330b7b | 402 | |
2f079f46 | 403 | (1<<ACL_WHERE_AUTH)| /* dk_status */ |
fb2274d4 TK |
404 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
405 | (1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
406 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
407 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
408 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
409 | (1<<ACL_WHERE_VRFY), | |
71fafd95 | 410 | #endif |
fb2274d4 | 411 | |
059ec3d9 PH |
412 | (1<<ACL_WHERE_NOTSMTP), /* dnslists */ |
413 | ||
2f079f46 PH |
414 | (unsigned int) |
415 | ~(1<<ACL_WHERE_RCPT), /* domains */ | |
059ec3d9 PH |
416 | |
417 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_CONNECT)| /* encrypted */ | |
418 | (1<<ACL_WHERE_HELO), | |
8e669ac1 | 419 | |
059ec3d9 | 420 | 0, /* endpass */ |
8e669ac1 | 421 | |
059ec3d9 PH |
422 | (1<<ACL_WHERE_NOTSMTP), /* hosts */ |
423 | ||
2f079f46 PH |
424 | (unsigned int) |
425 | ~(1<<ACL_WHERE_RCPT), /* local_parts */ | |
059ec3d9 PH |
426 | |
427 | 0, /* log_message */ | |
8e669ac1 | 428 | |
059ec3d9 | 429 | 0, /* logwrite */ |
8e669ac1 | 430 | |
71fafd95 | 431 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
432 | (unsigned int) |
433 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* malware */ | |
71fafd95 | 434 | #endif |
8523533c | 435 | |
059ec3d9 PH |
436 | 0, /* message */ |
437 | ||
71fafd95 | 438 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
439 | (unsigned int) |
440 | ~(1<<ACL_WHERE_MIME), /* mime_regex */ | |
71fafd95 | 441 | #endif |
8523533c | 442 | |
870f6ba8 TF |
443 | 0, /* ratelimit */ |
444 | ||
2f079f46 PH |
445 | (unsigned int) |
446 | ~(1<<ACL_WHERE_RCPT), /* recipients */ | |
059ec3d9 | 447 | |
71fafd95 | 448 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
449 | (unsigned int) |
450 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| /* regex */ | |
451 | (1<<ACL_WHERE_MIME)), | |
71fafd95 | 452 | #endif |
8523533c | 453 | |
059ec3d9 PH |
454 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* sender_domains */ |
455 | (1<<ACL_WHERE_HELO)| | |
456 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
457 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
458 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
459 | ||
460 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* senders */ | |
461 | (1<<ACL_WHERE_HELO)| | |
462 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
463 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
464 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
465 | ||
466 | 0, /* set */ | |
467 | ||
71fafd95 | 468 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
469 | (unsigned int) |
470 | ~((1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)), /* spam */ | |
71fafd95 | 471 | #endif |
8523533c | 472 | |
71fafd95 | 473 | #ifdef EXPERIMENTAL_SPF |
8523533c TK |
474 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf */ |
475 | (1<<ACL_WHERE_HELO)| | |
476 | (1<<ACL_WHERE_MAILAUTH)| | |
477 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
478 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
71fafd95 | 479 | #endif |
8523533c | 480 | |
059ec3d9 PH |
481 | /* Certain types of verify are always allowed, so we let it through |
482 | always and check in the verify function itself */ | |
483 | ||
484 | 0 /* verify */ | |
059ec3d9 PH |
485 | }; |
486 | ||
487 | ||
c5fcb476 PH |
488 | /* Bit map vector of which controls are not allowed at certain times. For |
489 | each control, there's a bitmap of dis-allowed times. For some, it is easier to | |
490 | specify the negation of a small number of allowed times. */ | |
491 | ||
492 | static unsigned int control_forbids[] = { | |
c46782ef PH |
493 | (unsigned int) |
494 | ~((1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)), /* allow_auth_unadvertised */ | |
495 | ||
496 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
8523533c | 497 | 0, /* bmi_run */ |
c46782ef PH |
498 | #endif |
499 | ||
500 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
e715ad22 | 501 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), /* dk_verify */ |
c46782ef | 502 | #endif |
3e11c26b | 503 | |
c5fcb476 | 504 | 0, /* error */ |
8e669ac1 PH |
505 | |
506 | (unsigned int) | |
c5fcb476 | 507 | ~(1<<ACL_WHERE_RCPT), /* caseful_local_part */ |
8e669ac1 PH |
508 | |
509 | (unsigned int) | |
c5fcb476 | 510 | ~(1<<ACL_WHERE_RCPT), /* caselower_local_part */ |
8e669ac1 | 511 | |
c5fcb476 | 512 | (1<<ACL_WHERE_NOTSMTP), /* enforce_sync */ |
8e669ac1 | 513 | |
c5fcb476 | 514 | (1<<ACL_WHERE_NOTSMTP), /* no_enforce_sync */ |
8e669ac1 PH |
515 | |
516 | (unsigned int) | |
c5fcb476 PH |
517 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* freeze */ |
518 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
e715ad22 | 519 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
520 | |
521 | (unsigned int) | |
c5fcb476 PH |
522 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* queue_only */ |
523 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
e715ad22 | 524 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)), |
8e669ac1 PH |
525 | |
526 | (unsigned int) | |
c5fcb476 | 527 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* submission */ |
8e669ac1 | 528 | (1<<ACL_WHERE_PREDATA)), |
8523533c | 529 | |
8800895a PH |
530 | (unsigned int) |
531 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* suppress_local_fixups */ | |
532 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_PREDATA)), | |
533 | ||
c46782ef | 534 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 535 | (unsigned int) |
14d57970 | 536 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* no_mbox_unspool */ |
e715ad22 TK |
537 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
538 | (1<<ACL_WHERE_MIME)), | |
c46782ef | 539 | #endif |
a6c4ab60 | 540 | |
29aba418 TF |
541 | (unsigned int) |
542 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakedefer */ | |
543 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
544 | (1<<ACL_WHERE_MIME)), | |
545 | ||
8e669ac1 | 546 | (unsigned int) |
a6c4ab60 | 547 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* fakereject */ |
e715ad22 TK |
548 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
549 | (1<<ACL_WHERE_MIME)), | |
8523533c | 550 | |
c5fcb476 PH |
551 | (1<<ACL_WHERE_NOTSMTP) /* no_multiline */ |
552 | }; | |
553 | ||
554 | /* Structure listing various control arguments, with their characteristics. */ | |
059ec3d9 PH |
555 | |
556 | typedef struct control_def { | |
557 | uschar *name; | |
558 | int value; /* CONTROL_xxx value */ | |
059ec3d9 PH |
559 | BOOL has_option; /* Has /option(s) following */ |
560 | } control_def; | |
561 | ||
562 | static control_def controls_list[] = { | |
c46782ef | 563 | { US"allow_auth_unadvertised", CONTROL_AUTH_UNADVERTISED, FALSE }, |
8523533c | 564 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
c46782ef | 565 | { US"bmi_run", CONTROL_BMI_RUN, FALSE }, |
fb2274d4 TK |
566 | #endif |
567 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
c46782ef | 568 | { US"dk_verify", CONTROL_DK_VERIFY, FALSE }, |
8523533c | 569 | #endif |
c46782ef PH |
570 | { US"caseful_local_part", CONTROL_CASEFUL_LOCAL_PART, FALSE }, |
571 | { US"caselower_local_part", CONTROL_CASELOWER_LOCAL_PART, FALSE }, | |
572 | { US"enforce_sync", CONTROL_ENFORCE_SYNC, FALSE }, | |
573 | { US"freeze", CONTROL_FREEZE, TRUE }, | |
574 | { US"no_enforce_sync", CONTROL_NO_ENFORCE_SYNC, FALSE }, | |
575 | { US"no_multiline_responses", CONTROL_NO_MULTILINE, FALSE }, | |
576 | { US"queue_only", CONTROL_QUEUE_ONLY, FALSE }, | |
8523533c | 577 | #ifdef WITH_CONTENT_SCAN |
c46782ef | 578 | { US"no_mbox_unspool", CONTROL_NO_MBOX_UNSPOOL, FALSE }, |
8523533c | 579 | #endif |
c46782ef PH |
580 | { US"fakedefer", CONTROL_FAKEDEFER, TRUE }, |
581 | { US"fakereject", CONTROL_FAKEREJECT, TRUE }, | |
582 | { US"submission", CONTROL_SUBMISSION, TRUE }, | |
583 | { US"suppress_local_fixups", CONTROL_SUPPRESS_LOCAL_FIXUPS, FALSE } | |
059ec3d9 PH |
584 | }; |
585 | ||
e5a9dba6 PH |
586 | /* Support data structures for Client SMTP Authorization. acl_verify_csa() |
587 | caches its result in a tree to avoid repeated DNS queries. The result is an | |
588 | integer code which is used as an index into the following tables of | |
589 | explanatory strings and verification return codes. */ | |
590 | ||
591 | static tree_node *csa_cache = NULL; | |
592 | ||
593 | enum { CSA_UNKNOWN, CSA_OK, CSA_DEFER_SRV, CSA_DEFER_ADDR, | |
594 | CSA_FAIL_EXPLICIT, CSA_FAIL_DOMAIN, CSA_FAIL_NOADDR, CSA_FAIL_MISMATCH }; | |
595 | ||
596 | /* The acl_verify_csa() return code is translated into an acl_verify() return | |
597 | code using the following table. It is OK unless the client is definitely not | |
598 | authorized. This is because CSA is supposed to be optional for sending sites, | |
599 | so recipients should not be too strict about checking it - especially because | |
600 | DNS problems are quite likely to occur. It's possible to use $csa_status in | |
601 | further ACL conditions to distinguish ok, unknown, and defer if required, but | |
602 | the aim is to make the usual configuration simple. */ | |
603 | ||
604 | static int csa_return_code[] = { | |
605 | OK, OK, OK, OK, | |
606 | FAIL, FAIL, FAIL, FAIL | |
607 | }; | |
608 | ||
609 | static uschar *csa_status_string[] = { | |
610 | US"unknown", US"ok", US"defer", US"defer", | |
611 | US"fail", US"fail", US"fail", US"fail" | |
612 | }; | |
613 | ||
614 | static uschar *csa_reason_string[] = { | |
615 | US"unknown", | |
616 | US"ok", | |
617 | US"deferred (SRV lookup failed)", | |
618 | US"deferred (target address lookup failed)", | |
619 | US"failed (explicit authorization required)", | |
620 | US"failed (host name not authorized)", | |
621 | US"failed (no authorized addresses)", | |
622 | US"failed (client address mismatch)" | |
623 | }; | |
624 | ||
059ec3d9 PH |
625 | /* Enable recursion between acl_check_internal() and acl_check_condition() */ |
626 | ||
627 | static int acl_check_internal(int, address_item *, uschar *, int, uschar **, | |
628 | uschar **); | |
629 | ||
630 | ||
631 | /************************************************* | |
632 | * Pick out name from list * | |
633 | *************************************************/ | |
634 | ||
635 | /* Use a binary chop method | |
636 | ||
637 | Arguments: | |
638 | name name to find | |
639 | list list of names | |
640 | end size of list | |
641 | ||
642 | Returns: offset in list, or -1 if not found | |
643 | */ | |
644 | ||
645 | static int | |
646 | acl_checkname(uschar *name, uschar **list, int end) | |
647 | { | |
648 | int start = 0; | |
649 | ||
650 | while (start < end) | |
651 | { | |
652 | int mid = (start + end)/2; | |
653 | int c = Ustrcmp(name, list[mid]); | |
654 | if (c == 0) return mid; | |
655 | if (c < 0) end = mid; else start = mid + 1; | |
656 | } | |
657 | ||
658 | return -1; | |
659 | } | |
660 | ||
661 | ||
662 | /************************************************* | |
663 | * Read and parse one ACL * | |
664 | *************************************************/ | |
665 | ||
666 | /* This function is called both from readconf in order to parse the ACLs in the | |
667 | configuration file, and also when an ACL is encountered dynamically (e.g. as | |
668 | the result of an expansion). It is given a function to call in order to | |
669 | retrieve the lines of the ACL. This function handles skipping comments and | |
670 | blank lines (where relevant). | |
671 | ||
672 | Arguments: | |
673 | func function to get next line of ACL | |
674 | error where to put an error message | |
675 | ||
676 | Returns: pointer to ACL, or NULL | |
677 | NULL can be legal (empty ACL); in this case error will be NULL | |
678 | */ | |
679 | ||
680 | acl_block * | |
681 | acl_read(uschar *(*func)(void), uschar **error) | |
682 | { | |
683 | acl_block *yield = NULL; | |
684 | acl_block **lastp = &yield; | |
685 | acl_block *this = NULL; | |
686 | acl_condition_block *cond; | |
687 | acl_condition_block **condp = NULL; | |
688 | uschar *s; | |
689 | ||
690 | *error = NULL; | |
691 | ||
692 | while ((s = (*func)()) != NULL) | |
693 | { | |
694 | int v, c; | |
695 | BOOL negated = FALSE; | |
696 | uschar *saveline = s; | |
697 | uschar name[64]; | |
698 | ||
699 | /* Conditions (but not verbs) are allowed to be negated by an initial | |
700 | exclamation mark. */ | |
701 | ||
702 | while (isspace(*s)) s++; | |
703 | if (*s == '!') | |
704 | { | |
705 | negated = TRUE; | |
706 | s++; | |
707 | } | |
708 | ||
cf00dad6 PH |
709 | /* Read the name of a verb or a condition, or the start of a new ACL, which |
710 | can be started by a name, or by a macro definition. */ | |
059ec3d9 PH |
711 | |
712 | s = readconf_readname(name, sizeof(name), s); | |
cf00dad6 | 713 | if (*s == ':' || isupper(name[0] && *s == '=')) return yield; |
059ec3d9 PH |
714 | |
715 | /* If a verb is unrecognized, it may be another condition or modifier that | |
716 | continues the previous verb. */ | |
717 | ||
718 | v = acl_checkname(name, verbs, sizeof(verbs)/sizeof(char *)); | |
719 | if (v < 0) | |
720 | { | |
721 | if (this == NULL) | |
722 | { | |
723 | *error = string_sprintf("unknown ACL verb in \"%s\"", saveline); | |
724 | return NULL; | |
725 | } | |
726 | } | |
727 | ||
728 | /* New verb */ | |
729 | ||
730 | else | |
731 | { | |
732 | if (negated) | |
733 | { | |
734 | *error = string_sprintf("malformed ACL line \"%s\"", saveline); | |
735 | return NULL; | |
736 | } | |
737 | this = store_get(sizeof(acl_block)); | |
738 | *lastp = this; | |
739 | lastp = &(this->next); | |
740 | this->next = NULL; | |
741 | this->verb = v; | |
742 | this->condition = NULL; | |
743 | condp = &(this->condition); | |
744 | if (*s == 0) continue; /* No condition on this line */ | |
745 | if (*s == '!') | |
746 | { | |
747 | negated = TRUE; | |
748 | s++; | |
749 | } | |
750 | s = readconf_readname(name, sizeof(name), s); /* Condition name */ | |
751 | } | |
752 | ||
753 | /* Handle a condition or modifier. */ | |
754 | ||
755 | c = acl_checkname(name, conditions, sizeof(conditions)/sizeof(char *)); | |
756 | if (c < 0) | |
757 | { | |
758 | *error = string_sprintf("unknown ACL condition/modifier in \"%s\"", | |
759 | saveline); | |
760 | return NULL; | |
761 | } | |
762 | ||
763 | /* The modifiers may not be negated */ | |
764 | ||
765 | if (negated && cond_modifiers[c]) | |
766 | { | |
767 | *error = string_sprintf("ACL error: negation is not allowed with " | |
768 | "\"%s\"", conditions[c]); | |
769 | return NULL; | |
770 | } | |
771 | ||
772 | /* ENDPASS may occur only with ACCEPT or DISCARD. */ | |
773 | ||
774 | if (c == ACLC_ENDPASS && | |
775 | this->verb != ACL_ACCEPT && | |
776 | this->verb != ACL_DISCARD) | |
777 | { | |
778 | *error = string_sprintf("ACL error: \"%s\" is not allowed with \"%s\"", | |
779 | conditions[c], verbs[this->verb]); | |
780 | return NULL; | |
781 | } | |
782 | ||
783 | cond = store_get(sizeof(acl_condition_block)); | |
784 | cond->next = NULL; | |
785 | cond->type = c; | |
786 | cond->u.negated = negated; | |
787 | ||
788 | *condp = cond; | |
789 | condp = &(cond->next); | |
790 | ||
791 | /* The "set" modifier is different in that its argument is "name=value" | |
792 | rather than just a value, and we can check the validity of the name, which | |
793 | gives us a variable number to insert into the data block. */ | |
794 | ||
795 | if (c == ACLC_SET) | |
796 | { | |
47ca6d6c PH |
797 | int offset, max, n; |
798 | uschar *endptr; | |
799 | ||
800 | if (Ustrncmp(s, "acl_", 4) != 0) goto BAD_ACL_VAR; | |
801 | if (s[4] == 'c') | |
802 | { | |
803 | offset = 0; | |
804 | max = ACL_CVARS; | |
805 | } | |
806 | else if (s[4] == 'm') | |
807 | { | |
808 | offset = ACL_CVARS; | |
809 | max = ACL_MVARS; | |
810 | } | |
811 | else goto BAD_ACL_VAR; | |
812 | ||
813 | n = Ustrtoul(s + 5, &endptr, 10); | |
814 | if ((*endptr != 0 && *endptr != '=' && !isspace(*endptr)) || n >= max) | |
059ec3d9 | 815 | { |
47ca6d6c PH |
816 | BAD_ACL_VAR: |
817 | *error = string_sprintf("syntax error or unrecognized name after " | |
818 | "\"set\" in ACL modifier \"set %s\"", s); | |
059ec3d9 PH |
819 | return NULL; |
820 | } | |
821 | ||
47ca6d6c PH |
822 | cond->u.varnumber = n + offset; |
823 | s = endptr; | |
059ec3d9 PH |
824 | while (isspace(*s)) s++; |
825 | } | |
826 | ||
827 | /* For "set", we are now positioned for the data. For the others, only | |
828 | "endpass" has no data */ | |
829 | ||
830 | if (c != ACLC_ENDPASS) | |
831 | { | |
832 | if (*s++ != '=') | |
833 | { | |
834 | *error = string_sprintf("\"=\" missing after ACL \"%s\" %s", name, | |
835 | cond_modifiers[c]? US"modifier" : US"condition"); | |
836 | return NULL; | |
837 | } | |
838 | while (isspace(*s)) s++; | |
839 | cond->arg = string_copy(s); | |
840 | } | |
841 | } | |
842 | ||
843 | return yield; | |
844 | } | |
845 | ||
846 | ||
847 | ||
71fafd95 PH |
848 | /************************************************* |
849 | * Set up added header line(s) * | |
850 | *************************************************/ | |
851 | ||
852 | /* This function is called by the add_header modifier, and also from acl_warn() | |
853 | to implement the now-deprecated way of adding header lines using "message" on a | |
854 | "warn" verb. The argument is treated as a sequence of header lines which are | |
855 | added to a chain, provided there isn't an identical one already there. | |
856 | ||
857 | Argument: string of header lines | |
858 | Returns: nothing | |
859 | */ | |
860 | ||
861 | static void | |
862 | setup_header(uschar *hstring) | |
863 | { | |
864 | uschar *p, *q; | |
865 | int hlen = Ustrlen(hstring); | |
866 | ||
867 | /* An empty string does nothing; otherwise add a final newline if necessary. */ | |
868 | ||
869 | if (hlen <= 0) return; | |
870 | if (hstring[hlen-1] != '\n') hstring = string_sprintf("%s\n", hstring); | |
871 | ||
872 | /* Loop for multiple header lines, taking care about continuations */ | |
873 | ||
874 | for (p = q = hstring; *p != 0; ) | |
875 | { | |
876 | uschar *s; | |
877 | int newtype = htype_add_bot; | |
878 | header_line **hptr = &acl_added_headers; | |
879 | ||
880 | /* Find next header line within the string */ | |
881 | ||
882 | for (;;) | |
883 | { | |
884 | q = Ustrchr(q, '\n'); | |
885 | if (*(++q) != ' ' && *q != '\t') break; | |
886 | } | |
887 | ||
888 | /* If the line starts with a colon, interpret the instruction for where to | |
889 | add it. This temporarily sets up a new type. */ | |
890 | ||
891 | if (*p == ':') | |
892 | { | |
893 | if (strncmpic(p, US":after_received:", 16) == 0) | |
894 | { | |
895 | newtype = htype_add_rec; | |
896 | p += 16; | |
897 | } | |
898 | else if (strncmpic(p, US":at_start_rfc:", 14) == 0) | |
899 | { | |
900 | newtype = htype_add_rfc; | |
901 | p += 14; | |
902 | } | |
903 | else if (strncmpic(p, US":at_start:", 10) == 0) | |
904 | { | |
905 | newtype = htype_add_top; | |
906 | p += 10; | |
907 | } | |
908 | else if (strncmpic(p, US":at_end:", 8) == 0) | |
909 | { | |
910 | newtype = htype_add_bot; | |
911 | p += 8; | |
912 | } | |
913 | while (*p == ' ' || *p == '\t') p++; | |
914 | } | |
915 | ||
916 | /* See if this line starts with a header name, and if not, add X-ACL-Warn: | |
917 | to the front of it. */ | |
918 | ||
919 | for (s = p; s < q - 1; s++) | |
920 | { | |
921 | if (*s == ':' || !isgraph(*s)) break; | |
922 | } | |
923 | ||
924 | s = string_sprintf("%s%.*s", (*s == ':')? "" : "X-ACL-Warn: ", q - p, p); | |
925 | hlen = Ustrlen(s); | |
926 | ||
927 | /* See if this line has already been added */ | |
928 | ||
929 | while (*hptr != NULL) | |
930 | { | |
931 | if (Ustrncmp((*hptr)->text, s, hlen) == 0) break; | |
932 | hptr = &((*hptr)->next); | |
933 | } | |
934 | ||
935 | /* Add if not previously present */ | |
936 | ||
937 | if (*hptr == NULL) | |
938 | { | |
939 | header_line *h = store_get(sizeof(header_line)); | |
940 | h->text = s; | |
941 | h->next = NULL; | |
942 | h->type = newtype; | |
943 | h->slen = hlen; | |
944 | *hptr = h; | |
945 | hptr = &(h->next); | |
946 | } | |
947 | ||
948 | /* Advance for next header line within the string */ | |
949 | ||
950 | p = q; | |
951 | } | |
952 | } | |
953 | ||
954 | ||
955 | ||
956 | ||
059ec3d9 PH |
957 | /************************************************* |
958 | * Handle warnings * | |
959 | *************************************************/ | |
960 | ||
961 | /* This function is called when a WARN verb's conditions are true. It adds to | |
962 | the message's headers, and/or writes information to the log. In each case, this | |
963 | only happens once (per message for headers, per connection for log). | |
964 | ||
71fafd95 PH |
965 | ** NOTE: The header adding action using the "message" setting is historic, and |
966 | its use is now deprecated. The new add_header modifier should be used instead. | |
967 | ||
059ec3d9 PH |
968 | Arguments: |
969 | where ACL_WHERE_xxxx indicating which ACL this is | |
970 | user_message message for adding to headers | |
971 | log_message message for logging, if different | |
972 | ||
973 | Returns: nothing | |
974 | */ | |
975 | ||
976 | static void | |
977 | acl_warn(int where, uschar *user_message, uschar *log_message) | |
978 | { | |
059ec3d9 PH |
979 | if (log_message != NULL && log_message != user_message) |
980 | { | |
981 | uschar *text; | |
982 | string_item *logged; | |
983 | ||
984 | text = string_sprintf("%s Warning: %s", host_and_ident(TRUE), | |
985 | string_printing(log_message)); | |
986 | ||
987 | /* If a sender verification has failed, and the log message is "sender verify | |
988 | failed", add the failure message. */ | |
989 | ||
990 | if (sender_verified_failed != NULL && | |
991 | sender_verified_failed->message != NULL && | |
992 | strcmpic(log_message, US"sender verify failed") == 0) | |
993 | text = string_sprintf("%s: %s", text, sender_verified_failed->message); | |
994 | ||
9c7a242c PH |
995 | /* Search previously logged warnings. They are kept in malloc |
996 | store so they can be freed at the start of a new message. */ | |
059ec3d9 PH |
997 | |
998 | for (logged = acl_warn_logged; logged != NULL; logged = logged->next) | |
999 | if (Ustrcmp(logged->text, text) == 0) break; | |
1000 | ||
1001 | if (logged == NULL) | |
1002 | { | |
1003 | int length = Ustrlen(text) + 1; | |
1004 | log_write(0, LOG_MAIN, "%s", text); | |
1005 | logged = store_malloc(sizeof(string_item) + length); | |
1006 | logged->text = (uschar *)logged + sizeof(string_item); | |
1007 | memcpy(logged->text, text, length); | |
1008 | logged->next = acl_warn_logged; | |
1009 | acl_warn_logged = logged; | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | /* If there's no user message, we are done. */ | |
1014 | ||
1015 | if (user_message == NULL) return; | |
1016 | ||
1017 | /* If this isn't a message ACL, we can't do anything with a user message. | |
1018 | Log an error. */ | |
1019 | ||
1020 | if (where > ACL_WHERE_NOTSMTP) | |
1021 | { | |
1022 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting " | |
1023 | "found in a non-message (%s) ACL: cannot specify header lines here: " | |
1024 | "message ignored", acl_wherenames[where]); | |
1025 | return; | |
1026 | } | |
1027 | ||
71fafd95 PH |
1028 | /* The code for setting up header lines is now abstracted into a separate |
1029 | function so that it can be used for the add_header modifier as well. */ | |
059ec3d9 | 1030 | |
71fafd95 | 1031 | setup_header(user_message); |
059ec3d9 PH |
1032 | } |
1033 | ||
1034 | ||
1035 | ||
1036 | /************************************************* | |
1037 | * Verify and check reverse DNS * | |
1038 | *************************************************/ | |
1039 | ||
1040 | /* Called from acl_verify() below. We look up the host name(s) of the client IP | |
1041 | address if this has not yet been done. The host_name_lookup() function checks | |
1042 | that one of these names resolves to an address list that contains the client IP | |
1043 | address, so we don't actually have to do the check here. | |
1044 | ||
1045 | Arguments: | |
1046 | user_msgptr pointer for user message | |
1047 | log_msgptr pointer for log message | |
1048 | ||
1049 | Returns: OK verification condition succeeded | |
1050 | FAIL verification failed | |
1051 | DEFER there was a problem verifying | |
1052 | */ | |
1053 | ||
1054 | static int | |
1055 | acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr) | |
1056 | { | |
1057 | int rc; | |
1058 | ||
1059 | user_msgptr = user_msgptr; /* stop compiler warning */ | |
1060 | ||
1061 | /* Previous success */ | |
1062 | ||
1063 | if (sender_host_name != NULL) return OK; | |
1064 | ||
1065 | /* Previous failure */ | |
1066 | ||
1067 | if (host_lookup_failed) | |
1068 | { | |
1069 | *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg); | |
1070 | return FAIL; | |
1071 | } | |
1072 | ||
1073 | /* Need to do a lookup */ | |
1074 | ||
1075 | HDEBUG(D_acl) | |
1076 | debug_printf("looking up host name to force name/address consistency check\n"); | |
1077 | ||
1078 | if ((rc = host_name_lookup()) != OK) | |
1079 | { | |
1080 | *log_msgptr = (rc == DEFER)? | |
1081 | US"host lookup deferred for reverse lookup check" | |
1082 | : | |
1083 | string_sprintf("host lookup failed for reverse lookup check%s", | |
1084 | host_lookup_msg); | |
1085 | return rc; /* DEFER or FAIL */ | |
1086 | } | |
1087 | ||
1088 | host_build_sender_fullhost(); | |
1089 | return OK; | |
1090 | } | |
1091 | ||
1092 | ||
1093 | ||
e5a9dba6 PH |
1094 | /************************************************* |
1095 | * Check client IP address matches CSA target * | |
1096 | *************************************************/ | |
1097 | ||
1098 | /* Called from acl_verify_csa() below. This routine scans a section of a DNS | |
1099 | response for address records belonging to the CSA target hostname. The section | |
1100 | is specified by the reset argument, either RESET_ADDITIONAL or RESET_ANSWERS. | |
1101 | If one of the addresses matches the client's IP address, then the client is | |
1102 | authorized by CSA. If there are target IP addresses but none of them match | |
1103 | then the client is using an unauthorized IP address. If there are no target IP | |
1104 | addresses then the client cannot be using an authorized IP address. (This is | |
1105 | an odd configuration - why didn't the SRV record have a weight of 1 instead?) | |
1106 | ||
1107 | Arguments: | |
1108 | dnsa the DNS answer block | |
1109 | dnss a DNS scan block for us to use | |
1110 | reset option specifing what portion to scan, as described above | |
1111 | target the target hostname to use for matching RR names | |
1112 | ||
1113 | Returns: CSA_OK successfully authorized | |
1114 | CSA_FAIL_MISMATCH addresses found but none matched | |
1115 | CSA_FAIL_NOADDR no target addresses found | |
1116 | */ | |
1117 | ||
1118 | static int | |
1119 | acl_verify_csa_address(dns_answer *dnsa, dns_scan *dnss, int reset, | |
1120 | uschar *target) | |
1121 | { | |
1122 | dns_record *rr; | |
1123 | dns_address *da; | |
1124 | ||
1125 | BOOL target_found = FALSE; | |
1126 | ||
1127 | for (rr = dns_next_rr(dnsa, dnss, reset); | |
1128 | rr != NULL; | |
1129 | rr = dns_next_rr(dnsa, dnss, RESET_NEXT)) | |
1130 | { | |
1131 | /* Check this is an address RR for the target hostname. */ | |
1132 | ||
1133 | if (rr->type != T_A | |
1134 | #if HAVE_IPV6 | |
1135 | && rr->type != T_AAAA | |
1136 | #ifdef SUPPORT_A6 | |
1137 | && rr->type != T_A6 | |
1138 | #endif | |
1139 | #endif | |
1140 | ) continue; | |
1141 | ||
1142 | if (strcmpic(target, rr->name) != 0) continue; | |
1143 | ||
1144 | target_found = TRUE; | |
1145 | ||
1146 | /* Turn the target address RR into a list of textual IP addresses and scan | |
1147 | the list. There may be more than one if it is an A6 RR. */ | |
1148 | ||
1149 | for (da = dns_address_from_rr(dnsa, rr); da != NULL; da = da->next) | |
1150 | { | |
1151 | /* If the client IP address matches the target IP address, it's good! */ | |
1152 | ||
1153 | DEBUG(D_acl) debug_printf("CSA target address is %s\n", da->address); | |
1154 | ||
1155 | if (strcmpic(sender_host_address, da->address) == 0) return CSA_OK; | |
1156 | } | |
1157 | } | |
1158 | ||
1159 | /* If we found some target addresses but none of them matched, the client is | |
1160 | using an unauthorized IP address, otherwise the target has no authorized IP | |
1161 | addresses. */ | |
1162 | ||
1163 | if (target_found) return CSA_FAIL_MISMATCH; | |
1164 | else return CSA_FAIL_NOADDR; | |
1165 | } | |
1166 | ||
1167 | ||
1168 | ||
1169 | /************************************************* | |
1170 | * Verify Client SMTP Authorization * | |
1171 | *************************************************/ | |
1172 | ||
1173 | /* Called from acl_verify() below. This routine calls dns_lookup_special() | |
1174 | to find the CSA SRV record corresponding to the domain argument, or | |
1175 | $sender_helo_name if no argument is provided. It then checks that the | |
1176 | client is authorized, and that its IP address corresponds to the SRV | |
1177 | target's address by calling acl_verify_csa_address() above. The address | |
1178 | should have been returned in the DNS response's ADDITIONAL section, but if | |
1179 | not we perform another DNS lookup to get it. | |
1180 | ||
1181 | Arguments: | |
1182 | domain pointer to optional parameter following verify = csa | |
1183 | ||
1184 | Returns: CSA_UNKNOWN no valid CSA record found | |
1185 | CSA_OK successfully authorized | |
1186 | CSA_FAIL_* client is definitely not authorized | |
1187 | CSA_DEFER_* there was a DNS problem | |
1188 | */ | |
1189 | ||
1190 | static int | |
1191 | acl_verify_csa(uschar *domain) | |
1192 | { | |
1193 | tree_node *t; | |
1194 | uschar *found, *p; | |
1195 | int priority, weight, port; | |
1196 | dns_answer dnsa; | |
1197 | dns_scan dnss; | |
1198 | dns_record *rr; | |
1199 | int rc, type; | |
1200 | uschar target[256]; | |
1201 | ||
1202 | /* Work out the domain we are using for the CSA lookup. The default is the | |
1203 | client's HELO domain. If the client has not said HELO, use its IP address | |
1204 | instead. If it's a local client (exim -bs), CSA isn't applicable. */ | |
1205 | ||
1206 | while (isspace(*domain) && *domain != '\0') ++domain; | |
1207 | if (*domain == '\0') domain = sender_helo_name; | |
1208 | if (domain == NULL) domain = sender_host_address; | |
1209 | if (sender_host_address == NULL) return CSA_UNKNOWN; | |
1210 | ||
1211 | /* If we have an address literal, strip off the framing ready for turning it | |
1212 | into a domain. The framing consists of matched square brackets possibly | |
1213 | containing a keyword and a colon before the actual IP address. */ | |
1214 | ||
1215 | if (domain[0] == '[') | |
1216 | { | |
1217 | uschar *start = Ustrchr(domain, ':'); | |
1218 | if (start == NULL) start = domain; | |
1219 | domain = string_copyn(start + 1, Ustrlen(start) - 2); | |
1220 | } | |
1221 | ||
1222 | /* Turn domains that look like bare IP addresses into domains in the reverse | |
1223 | DNS. This code also deals with address literals and $sender_host_address. It's | |
1224 | not quite kosher to treat bare domains such as EHLO 192.0.2.57 the same as | |
1225 | address literals, but it's probably the most friendly thing to do. This is an | |
1226 | extension to CSA, so we allow it to be turned off for proper conformance. */ | |
1227 | ||
7e66e54d | 1228 | if (string_is_ip_address(domain, NULL) != 0) |
e5a9dba6 PH |
1229 | { |
1230 | if (!dns_csa_use_reverse) return CSA_UNKNOWN; | |
1231 | dns_build_reverse(domain, target); | |
1232 | domain = target; | |
1233 | } | |
1234 | ||
1235 | /* Find out if we've already done the CSA check for this domain. If we have, | |
1236 | return the same result again. Otherwise build a new cached result structure | |
1237 | for this domain. The name is filled in now, and the value is filled in when | |
1238 | we return from this function. */ | |
1239 | ||
1240 | t = tree_search(csa_cache, domain); | |
1241 | if (t != NULL) return t->data.val; | |
1242 | ||
1243 | t = store_get_perm(sizeof(tree_node) + Ustrlen(domain)); | |
1244 | Ustrcpy(t->name, domain); | |
1245 | (void)tree_insertnode(&csa_cache, t); | |
1246 | ||
1247 | /* Now we are ready to do the actual DNS lookup(s). */ | |
1248 | ||
28e6ef29 | 1249 | found = domain; |
e5a9dba6 PH |
1250 | switch (dns_special_lookup(&dnsa, domain, T_CSA, &found)) |
1251 | { | |
1252 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1253 | ||
1254 | default: | |
1255 | return t->data.val = CSA_DEFER_SRV; | |
1256 | ||
1257 | /* If we found nothing, the client's authorization is unknown. */ | |
1258 | ||
1259 | case DNS_NOMATCH: | |
1260 | case DNS_NODATA: | |
1261 | return t->data.val = CSA_UNKNOWN; | |
1262 | ||
1263 | /* We got something! Go on to look at the reply in more detail. */ | |
1264 | ||
1265 | case DNS_SUCCEED: | |
1266 | break; | |
1267 | } | |
1268 | ||
1269 | /* Scan the reply for well-formed CSA SRV records. */ | |
1270 | ||
1271 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
1272 | rr != NULL; | |
1273 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
1274 | { | |
1275 | if (rr->type != T_SRV) continue; | |
1276 | ||
1277 | /* Extract the numerical SRV fields (p is incremented) */ | |
1278 | ||
1279 | p = rr->data; | |
1280 | GETSHORT(priority, p); | |
1281 | GETSHORT(weight, p); | |
1282 | GETSHORT(port, p); | |
1283 | ||
1284 | DEBUG(D_acl) | |
1285 | debug_printf("CSA priority=%d weight=%d port=%d\n", priority, weight, port); | |
1286 | ||
1287 | /* Check the CSA version number */ | |
1288 | ||
1289 | if (priority != 1) continue; | |
1290 | ||
1291 | /* If the domain does not have a CSA SRV record of its own (i.e. the domain | |
1292 | found by dns_special_lookup() is a parent of the one we asked for), we check | |
1293 | the subdomain assertions in the port field. At the moment there's only one | |
1294 | assertion: legitimate SMTP clients are all explicitly authorized with CSA | |
1295 | SRV records of their own. */ | |
1296 | ||
1297 | if (found != domain) | |
1298 | { | |
1299 | if (port & 1) | |
1300 | return t->data.val = CSA_FAIL_EXPLICIT; | |
1301 | else | |
1302 | return t->data.val = CSA_UNKNOWN; | |
1303 | } | |
1304 | ||
1305 | /* This CSA SRV record refers directly to our domain, so we check the value | |
1306 | in the weight field to work out the domain's authorization. 0 and 1 are | |
1307 | unauthorized; 3 means the client is authorized but we can't check the IP | |
1308 | address in order to authenticate it, so we treat it as unknown; values | |
1309 | greater than 3 are undefined. */ | |
1310 | ||
1311 | if (weight < 2) return t->data.val = CSA_FAIL_DOMAIN; | |
1312 | ||
1313 | if (weight > 2) continue; | |
1314 | ||
1315 | /* Weight == 2, which means the domain is authorized. We must check that the | |
1316 | client's IP address is listed as one of the SRV target addresses. Save the | |
1317 | target hostname then break to scan the additional data for its addresses. */ | |
1318 | ||
1319 | (void)dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, | |
1320 | (DN_EXPAND_ARG4_TYPE)target, sizeof(target)); | |
1321 | ||
1322 | DEBUG(D_acl) debug_printf("CSA target is %s\n", target); | |
1323 | ||
1324 | break; | |
1325 | } | |
1326 | ||
1327 | /* If we didn't break the loop then no appropriate records were found. */ | |
1328 | ||
1329 | if (rr == NULL) return t->data.val = CSA_UNKNOWN; | |
1330 | ||
1331 | /* Do not check addresses if the target is ".", in accordance with RFC 2782. | |
1332 | A target of "." indicates there are no valid addresses, so the client cannot | |
1333 | be authorized. (This is an odd configuration because weight=2 target=. is | |
1334 | equivalent to weight=1, but we check for it in order to keep load off the | |
1335 | root name servers.) Note that dn_expand() turns "." into "". */ | |
1336 | ||
1337 | if (Ustrcmp(target, "") == 0) return t->data.val = CSA_FAIL_NOADDR; | |
1338 | ||
1339 | /* Scan the additional section of the CSA SRV reply for addresses belonging | |
1340 | to the target. If the name server didn't return any additional data (e.g. | |
1341 | because it does not fully support SRV records), we need to do another lookup | |
1342 | to obtain the target addresses; otherwise we have a definitive result. */ | |
1343 | ||
1344 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ADDITIONAL, target); | |
1345 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1346 | ||
1347 | /* The DNS lookup type corresponds to the IP version used by the client. */ | |
1348 | ||
1349 | #if HAVE_IPV6 | |
1350 | if (Ustrchr(sender_host_address, ':') != NULL) | |
1351 | type = T_AAAA; | |
1352 | else | |
1353 | #endif /* HAVE_IPV6 */ | |
1354 | type = T_A; | |
1355 | ||
1356 | ||
1357 | #if HAVE_IPV6 && defined(SUPPORT_A6) | |
1358 | DNS_LOOKUP_AGAIN: | |
1359 | #endif | |
1360 | ||
1361 | switch (dns_lookup(&dnsa, target, type, NULL)) | |
1362 | { | |
1363 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1364 | ||
1365 | default: | |
1366 | return t->data.val = CSA_DEFER_ADDR; | |
1367 | ||
1368 | /* If the query succeeded, scan the addresses and return the result. */ | |
1369 | ||
1370 | case DNS_SUCCEED: | |
1371 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ANSWERS, target); | |
1372 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1373 | /* else fall through */ | |
1374 | ||
1375 | /* If the target has no IP addresses, the client cannot have an authorized | |
1376 | IP address. However, if the target site uses A6 records (not AAAA records) | |
1377 | we have to do yet another lookup in order to check them. */ | |
1378 | ||
1379 | case DNS_NOMATCH: | |
1380 | case DNS_NODATA: | |
1381 | ||
1382 | #if HAVE_IPV6 && defined(SUPPORT_A6) | |
1383 | if (type == T_AAAA) { type = T_A6; goto DNS_LOOKUP_AGAIN; } | |
1384 | #endif | |
1385 | ||
1386 | return t->data.val = CSA_FAIL_NOADDR; | |
1387 | } | |
1388 | } | |
1389 | ||
1390 | ||
1391 | ||
059ec3d9 PH |
1392 | /************************************************* |
1393 | * Handle verification (address & other) * | |
1394 | *************************************************/ | |
1395 | ||
1396 | /* This function implements the "verify" condition. It is called when | |
1397 | encountered in any ACL, because some tests are almost always permitted. Some | |
1398 | just don't make sense, and always fail (for example, an attempt to test a host | |
1399 | lookup for a non-TCP/IP message). Others are restricted to certain ACLs. | |
1400 | ||
1401 | Arguments: | |
1402 | where where called from | |
1403 | addr the recipient address that the ACL is handling, or NULL | |
1404 | arg the argument of "verify" | |
1405 | user_msgptr pointer for user message | |
1406 | log_msgptr pointer for log message | |
1407 | basic_errno where to put verify errno | |
1408 | ||
1409 | Returns: OK verification condition succeeded | |
1410 | FAIL verification failed | |
1411 | DEFER there was a problem verifying | |
1412 | ERROR syntax error | |
1413 | */ | |
1414 | ||
1415 | static int | |
1416 | acl_verify(int where, address_item *addr, uschar *arg, | |
1417 | uschar **user_msgptr, uschar **log_msgptr, int *basic_errno) | |
1418 | { | |
1419 | int sep = '/'; | |
1420 | int callout = -1; | |
1421 | int callout_overall = -1; | |
4deaf07d | 1422 | int callout_connect = -1; |
059ec3d9 PH |
1423 | int verify_options = 0; |
1424 | int rc; | |
1425 | BOOL verify_header_sender = FALSE; | |
1426 | BOOL defer_ok = FALSE; | |
1427 | BOOL callout_defer_ok = FALSE; | |
1428 | BOOL no_details = FALSE; | |
eafd343b | 1429 | BOOL success_on_redirect = FALSE; |
059ec3d9 PH |
1430 | address_item *sender_vaddr = NULL; |
1431 | uschar *verify_sender_address = NULL; | |
1432 | uschar *pm_mailfrom = NULL; | |
1433 | uschar *se_mailfrom = NULL; | |
596875b3 PH |
1434 | |
1435 | /* Some of the verify items have slash-separated options; some do not. Diagnose | |
1436 | an error if options are given for items that don't expect them. This code has | |
1437 | now got very message. Refactoring to use a table would be a good idea one day. | |
1438 | */ | |
1439 | ||
1440 | uschar *slash = Ustrchr(arg, '/'); | |
059ec3d9 PH |
1441 | uschar *list = arg; |
1442 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
1443 | ||
1444 | if (ss == NULL) goto BAD_VERIFY; | |
1445 | ||
1446 | /* Handle name/address consistency verification in a separate function. */ | |
1447 | ||
1448 | if (strcmpic(ss, US"reverse_host_lookup") == 0) | |
1449 | { | |
596875b3 | 1450 | if (slash != NULL) goto NO_OPTIONS; |
059ec3d9 PH |
1451 | if (sender_host_address == NULL) return OK; |
1452 | return acl_verify_reverse(user_msgptr, log_msgptr); | |
1453 | } | |
1454 | ||
1455 | /* TLS certificate verification is done at STARTTLS time; here we just | |
1456 | test whether it was successful or not. (This is for optional verification; for | |
1457 | mandatory verification, the connection doesn't last this long.) */ | |
1458 | ||
1459 | if (strcmpic(ss, US"certificate") == 0) | |
1460 | { | |
596875b3 | 1461 | if (slash != NULL) goto NO_OPTIONS; |
059ec3d9 PH |
1462 | if (tls_certificate_verified) return OK; |
1463 | *user_msgptr = US"no verified certificate"; | |
1464 | return FAIL; | |
1465 | } | |
1466 | ||
d7b47fd0 PH |
1467 | /* We can test the result of optional HELO verification that might have |
1468 | occurred earlier. If not, we can attempt the verification now. */ | |
059ec3d9 | 1469 | |
596875b3 PH |
1470 | if (strcmpic(ss, US"helo") == 0) |
1471 | { | |
1472 | if (slash != NULL) goto NO_OPTIONS; | |
0154e85a TF |
1473 | if (!helo_verified && !helo_verify_failed) smtp_verify_helo(); |
1474 | return helo_verified? OK : FAIL; | |
596875b3 | 1475 | } |
059ec3d9 | 1476 | |
e5a9dba6 PH |
1477 | /* Do Client SMTP Authorization checks in a separate function, and turn the |
1478 | result code into user-friendly strings. */ | |
1479 | ||
1480 | if (strcmpic(ss, US"csa") == 0) | |
1481 | { | |
1482 | rc = acl_verify_csa(list); | |
1483 | *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s", | |
1484 | csa_reason_string[rc]); | |
1485 | csa_status = csa_status_string[rc]; | |
1486 | DEBUG(D_acl) debug_printf("CSA result %s\n", csa_status); | |
1487 | return csa_return_code[rc]; | |
1488 | } | |
1489 | ||
596875b3 PH |
1490 | /* Check that all relevant header lines have the correct syntax. If there is |
1491 | a syntax error, we return details of the error to the sender if configured to | |
1492 | send out full details. (But a "message" setting on the ACL can override, as | |
1493 | always). */ | |
059ec3d9 | 1494 | |
596875b3 | 1495 | if (strcmpic(ss, US"header_syntax") == 0) |
059ec3d9 | 1496 | { |
596875b3 | 1497 | if (slash != NULL) goto NO_OPTIONS; |
1c41c9cc | 1498 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; |
596875b3 PH |
1499 | rc = verify_check_headers(log_msgptr); |
1500 | if (rc != OK && smtp_return_error_details && *log_msgptr != NULL) | |
1501 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1502 | return rc; | |
1503 | } | |
059ec3d9 | 1504 | |
1c41c9cc PH |
1505 | /* Check that no recipient of this message is "blind", that is, every envelope |
1506 | recipient must be mentioned in either To: or Cc:. */ | |
1507 | ||
1508 | if (strcmpic(ss, US"not_blind") == 0) | |
1509 | { | |
1510 | if (slash != NULL) goto NO_OPTIONS; | |
1511 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; | |
1512 | rc = verify_check_notblind(); | |
1513 | if (rc != OK) | |
1514 | { | |
1515 | *log_msgptr = string_sprintf("bcc recipient detected"); | |
1516 | if (smtp_return_error_details) | |
1517 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1518 | } | |
1519 | return rc; | |
1520 | } | |
059ec3d9 | 1521 | |
596875b3 PH |
1522 | /* The remaining verification tests check recipient and sender addresses, |
1523 | either from the envelope or from the header. There are a number of | |
1524 | slash-separated options that are common to all of them. */ | |
059ec3d9 | 1525 | |
059ec3d9 | 1526 | |
596875b3 PH |
1527 | /* Check that there is at least one verifiable sender address in the relevant |
1528 | header lines. This can be followed by callout and defer options, just like | |
1529 | sender and recipient. */ | |
059ec3d9 | 1530 | |
596875b3 PH |
1531 | if (strcmpic(ss, US"header_sender") == 0) |
1532 | { | |
1c41c9cc | 1533 | if (where != ACL_WHERE_DATA && where != ACL_WHERE_NOTSMTP) goto WRONG_ACL; |
596875b3 | 1534 | verify_header_sender = TRUE; |
059ec3d9 PH |
1535 | } |
1536 | ||
1537 | /* Otherwise, first item in verify argument must be "sender" or "recipient". | |
1538 | In the case of a sender, this can optionally be followed by an address to use | |
1539 | in place of the actual sender (rare special-case requirement). */ | |
1540 | ||
1541 | else if (strncmpic(ss, US"sender", 6) == 0) | |
1542 | { | |
1543 | uschar *s = ss + 6; | |
1544 | if (where > ACL_WHERE_NOTSMTP) | |
1545 | { | |
1546 | *log_msgptr = string_sprintf("cannot verify sender in ACL for %s " | |
1547 | "(only possible for MAIL, RCPT, PREDATA, or DATA)", | |
1548 | acl_wherenames[where]); | |
1549 | return ERROR; | |
1550 | } | |
1551 | if (*s == 0) | |
1552 | verify_sender_address = sender_address; | |
1553 | else | |
1554 | { | |
1555 | while (isspace(*s)) s++; | |
1556 | if (*s++ != '=') goto BAD_VERIFY; | |
1557 | while (isspace(*s)) s++; | |
1558 | verify_sender_address = string_copy(s); | |
1559 | } | |
1560 | } | |
1561 | else | |
1562 | { | |
1563 | if (strcmpic(ss, US"recipient") != 0) goto BAD_VERIFY; | |
1564 | if (addr == NULL) | |
1565 | { | |
1566 | *log_msgptr = string_sprintf("cannot verify recipient in ACL for %s " | |
1567 | "(only possible for RCPT)", acl_wherenames[where]); | |
1568 | return ERROR; | |
1569 | } | |
1570 | } | |
1571 | ||
596875b3 PH |
1572 | /* Remaining items are optional; they apply to sender and recipient |
1573 | verification, including "header sender" verification. */ | |
059ec3d9 PH |
1574 | |
1575 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) | |
1576 | != NULL) | |
1577 | { | |
1578 | if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE; | |
1579 | else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE; | |
eafd343b | 1580 | else if (strcmpic(ss, US"success_on_redirect") == 0) success_on_redirect = TRUE; |
059ec3d9 PH |
1581 | |
1582 | /* These two old options are left for backwards compatibility */ | |
1583 | ||
1584 | else if (strcmpic(ss, US"callout_defer_ok") == 0) | |
1585 | { | |
1586 | callout_defer_ok = TRUE; | |
1587 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1588 | } | |
1589 | ||
1590 | else if (strcmpic(ss, US"check_postmaster") == 0) | |
1591 | { | |
1592 | pm_mailfrom = US""; | |
1593 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1594 | } | |
1595 | ||
1596 | /* The callout option has a number of sub-options, comma separated */ | |
1597 | ||
1598 | else if (strncmpic(ss, US"callout", 7) == 0) | |
1599 | { | |
1600 | callout = CALLOUT_TIMEOUT_DEFAULT; | |
1601 | ss += 7; | |
1602 | if (*ss != 0) | |
1603 | { | |
1604 | while (isspace(*ss)) ss++; | |
1605 | if (*ss++ == '=') | |
1606 | { | |
1607 | int optsep = ','; | |
1608 | uschar *opt; | |
1609 | uschar buffer[256]; | |
1610 | while (isspace(*ss)) ss++; | |
8e669ac1 PH |
1611 | |
1612 | /* This callout option handling code has become a mess as new options | |
1613 | have been added in an ad hoc manner. It should be tidied up into some | |
4deaf07d | 1614 | kind of table-driven thing. */ |
8e669ac1 | 1615 | |
059ec3d9 PH |
1616 | while ((opt = string_nextinlist(&ss, &optsep, buffer, sizeof(buffer))) |
1617 | != NULL) | |
1618 | { | |
1619 | if (strcmpic(opt, US"defer_ok") == 0) callout_defer_ok = TRUE; | |
1620 | else if (strcmpic(opt, US"no_cache") == 0) | |
1621 | verify_options |= vopt_callout_no_cache; | |
1622 | else if (strcmpic(opt, US"random") == 0) | |
1623 | verify_options |= vopt_callout_random; | |
1624 | else if (strcmpic(opt, US"use_sender") == 0) | |
1625 | verify_options |= vopt_callout_recipsender; | |
1626 | else if (strcmpic(opt, US"use_postmaster") == 0) | |
1627 | verify_options |= vopt_callout_recippmaster; | |
1628 | else if (strcmpic(opt, US"postmaster") == 0) pm_mailfrom = US""; | |
2a4be8f9 PH |
1629 | else if (strcmpic(opt, US"fullpostmaster") == 0) |
1630 | { | |
1631 | pm_mailfrom = US""; | |
1632 | verify_options |= vopt_callout_fullpm; | |
1633 | } | |
059ec3d9 PH |
1634 | |
1635 | else if (strncmpic(opt, US"mailfrom", 8) == 0) | |
1636 | { | |
1637 | if (!verify_header_sender) | |
1638 | { | |
1639 | *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a " | |
1640 | "callout option only for verify=header_sender (detected in ACL " | |
1641 | "condition \"%s\")", arg); | |
1642 | return ERROR; | |
1643 | } | |
1644 | opt += 8; | |
1645 | while (isspace(*opt)) opt++; | |
1646 | if (*opt++ != '=') | |
1647 | { | |
1648 | *log_msgptr = string_sprintf("'=' expected after " | |
1649 | "\"mailfrom\" in ACL condition \"%s\"", arg); | |
1650 | return ERROR; | |
1651 | } | |
1652 | while (isspace(*opt)) opt++; | |
1653 | se_mailfrom = string_copy(opt); | |
1654 | } | |
1655 | ||
1656 | else if (strncmpic(opt, US"postmaster_mailfrom", 19) == 0) | |
1657 | { | |
1658 | opt += 19; | |
1659 | while (isspace(*opt)) opt++; | |
1660 | if (*opt++ != '=') | |
1661 | { | |
1662 | *log_msgptr = string_sprintf("'=' expected after " | |
1663 | "\"postmaster_mailfrom\" in ACL condition \"%s\"", arg); | |
1664 | return ERROR; | |
1665 | } | |
1666 | while (isspace(*opt)) opt++; | |
1667 | pm_mailfrom = string_copy(opt); | |
1668 | } | |
1669 | ||
1670 | else if (strncmpic(opt, US"maxwait", 7) == 0) | |
1671 | { | |
1672 | opt += 7; | |
1673 | while (isspace(*opt)) opt++; | |
1674 | if (*opt++ != '=') | |
1675 | { | |
1676 | *log_msgptr = string_sprintf("'=' expected after \"maxwait\" in " | |
1677 | "ACL condition \"%s\"", arg); | |
1678 | return ERROR; | |
1679 | } | |
1680 | while (isspace(*opt)) opt++; | |
1681 | callout_overall = readconf_readtime(opt, 0, FALSE); | |
1682 | if (callout_overall < 0) | |
1683 | { | |
1684 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1685 | "\"verify %s\"", arg); | |
1686 | return ERROR; | |
1687 | } | |
1688 | } | |
4deaf07d PH |
1689 | else if (strncmpic(opt, US"connect", 7) == 0) |
1690 | { | |
1691 | opt += 7; | |
1692 | while (isspace(*opt)) opt++; | |
1693 | if (*opt++ != '=') | |
1694 | { | |
1695 | *log_msgptr = string_sprintf("'=' expected after " | |
1696 | "\"callout_overaall\" in ACL condition \"%s\"", arg); | |
1697 | return ERROR; | |
1698 | } | |
1699 | while (isspace(*opt)) opt++; | |
1700 | callout_connect = readconf_readtime(opt, 0, FALSE); | |
1701 | if (callout_connect < 0) | |
1702 | { | |
1703 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1704 | "\"verify %s\"", arg); | |
1705 | return ERROR; | |
1706 | } | |
1707 | } | |
059ec3d9 PH |
1708 | else /* Plain time is callout connect/command timeout */ |
1709 | { | |
1710 | callout = readconf_readtime(opt, 0, FALSE); | |
1711 | if (callout < 0) | |
1712 | { | |
1713 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1714 | "\"verify %s\"", arg); | |
1715 | return ERROR; | |
1716 | } | |
1717 | } | |
1718 | } | |
1719 | } | |
1720 | else | |
1721 | { | |
1722 | *log_msgptr = string_sprintf("'=' expected after \"callout\" in " | |
1723 | "ACL condition \"%s\"", arg); | |
1724 | return ERROR; | |
1725 | } | |
1726 | } | |
1727 | } | |
1728 | ||
1729 | /* Option not recognized */ | |
1730 | ||
1731 | else | |
1732 | { | |
1733 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " | |
1734 | "condition \"verify %s\"", ss, arg); | |
1735 | return ERROR; | |
1736 | } | |
1737 | } | |
1738 | ||
1739 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == | |
1740 | (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1741 | { | |
1742 | *log_msgptr = US"only one of use_sender and use_postmaster can be set " | |
1743 | "for a recipient callout"; | |
1744 | return ERROR; | |
1745 | } | |
1746 | ||
1747 | /* Handle sender-in-header verification. Default the user message to the log | |
1748 | message if giving out verification details. */ | |
1749 | ||
1750 | if (verify_header_sender) | |
1751 | { | |
8e669ac1 | 1752 | int verrno; |
059ec3d9 | 1753 | rc = verify_check_header_address(user_msgptr, log_msgptr, callout, |
fe5b5d0b PH |
1754 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, verify_options, |
1755 | &verrno); | |
1756 | if (rc != OK) | |
8e669ac1 | 1757 | { |
fe5b5d0b PH |
1758 | *basic_errno = verrno; |
1759 | if (smtp_return_error_details) | |
1760 | { | |
1761 | if (*user_msgptr == NULL && *log_msgptr != NULL) | |
1762 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1763 | if (rc == DEFER) acl_temp_details = TRUE; | |
1764 | } | |
8e669ac1 | 1765 | } |
059ec3d9 PH |
1766 | } |
1767 | ||
1768 | /* Handle a sender address. The default is to verify *the* sender address, but | |
1769 | optionally a different address can be given, for special requirements. If the | |
1770 | address is empty, we are dealing with a bounce message that has no sender, so | |
1771 | we cannot do any checking. If the real sender address gets rewritten during | |
1772 | verification (e.g. DNS widening), set the flag to stop it being rewritten again | |
1773 | during message reception. | |
1774 | ||
1775 | A list of verified "sender" addresses is kept to try to avoid doing to much | |
1776 | work repetitively when there are multiple recipients in a message and they all | |
1777 | require sender verification. However, when callouts are involved, it gets too | |
1778 | complicated because different recipients may require different callout options. | |
1779 | Therefore, we always do a full sender verify when any kind of callout is | |
1780 | specified. Caching elsewhere, for instance in the DNS resolver and in the | |
1781 | callout handling, should ensure that this is not terribly inefficient. */ | |
1782 | ||
1783 | else if (verify_sender_address != NULL) | |
1784 | { | |
1785 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1786 | != 0) | |
1787 | { | |
1788 | *log_msgptr = US"use_sender or use_postmaster cannot be used for a " | |
1789 | "sender verify callout"; | |
1790 | return ERROR; | |
1791 | } | |
1792 | ||
1793 | sender_vaddr = verify_checked_sender(verify_sender_address); | |
1794 | if (sender_vaddr != NULL && /* Previously checked */ | |
1795 | callout <= 0) /* No callout needed this time */ | |
1796 | { | |
1797 | /* If the "routed" flag is set, it means that routing worked before, so | |
1798 | this check can give OK (the saved return code value, if set, belongs to a | |
1799 | callout that was done previously). If the "routed" flag is not set, routing | |
1800 | must have failed, so we use the saved return code. */ | |
1801 | ||
1802 | if (testflag(sender_vaddr, af_verify_routed)) rc = OK; else | |
1803 | { | |
1804 | rc = sender_vaddr->special_action; | |
1805 | *basic_errno = sender_vaddr->basic_errno; | |
1806 | } | |
1807 | HDEBUG(D_acl) debug_printf("using cached sender verify result\n"); | |
1808 | } | |
1809 | ||
1810 | /* Do a new verification, and cache the result. The cache is used to avoid | |
1811 | verifying the sender multiple times for multiple RCPTs when callouts are not | |
1812 | specified (see comments above). | |
1813 | ||
1814 | The cache is also used on failure to give details in response to the first | |
1815 | RCPT that gets bounced for this reason. However, this can be suppressed by | |
1816 | the no_details option, which sets the flag that says "this detail has already | |
1817 | been sent". The cache normally contains just one address, but there may be | |
1818 | more in esoteric circumstances. */ | |
1819 | ||
1820 | else | |
1821 | { | |
1822 | BOOL routed = TRUE; | |
2a3eea10 | 1823 | uschar *save_address_data = deliver_address_data; |
8e669ac1 | 1824 | |
059ec3d9 PH |
1825 | sender_vaddr = deliver_make_addr(verify_sender_address, TRUE); |
1826 | if (no_details) setflag(sender_vaddr, af_sverify_told); | |
1827 | if (verify_sender_address[0] != 0) | |
1828 | { | |
1829 | /* If this is the real sender address, save the unrewritten version | |
1830 | for use later in receive. Otherwise, set a flag so that rewriting the | |
1831 | sender in verify_address() does not update sender_address. */ | |
1832 | ||
1833 | if (verify_sender_address == sender_address) | |
1834 | sender_address_unrewritten = sender_address; | |
1835 | else | |
1836 | verify_options |= vopt_fake_sender; | |
1837 | ||
eafd343b TK |
1838 | if (success_on_redirect) |
1839 | verify_options |= vopt_success_on_redirect; | |
1840 | ||
059ec3d9 PH |
1841 | /* The recipient, qualify, and expn options are never set in |
1842 | verify_options. */ | |
1843 | ||
1844 | rc = verify_address(sender_vaddr, NULL, verify_options, callout, | |
4deaf07d | 1845 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, &routed); |
059ec3d9 PH |
1846 | |
1847 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); | |
1848 | ||
1849 | if (rc == OK) | |
1850 | { | |
1851 | if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0) | |
1852 | { | |
1853 | DEBUG(D_acl) debug_printf("sender %s verified ok as %s\n", | |
1854 | verify_sender_address, sender_vaddr->address); | |
1855 | } | |
1856 | else | |
1857 | { | |
1858 | DEBUG(D_acl) debug_printf("sender %s verified ok\n", | |
1859 | verify_sender_address); | |
1860 | } | |
1861 | } | |
1862 | else *basic_errno = sender_vaddr->basic_errno; | |
1863 | } | |
1864 | else rc = OK; /* Null sender */ | |
1865 | ||
1866 | /* Cache the result code */ | |
1867 | ||
1868 | if (routed) setflag(sender_vaddr, af_verify_routed); | |
1869 | if (callout > 0) setflag(sender_vaddr, af_verify_callout); | |
1870 | sender_vaddr->special_action = rc; | |
1871 | sender_vaddr->next = sender_verified_list; | |
1872 | sender_verified_list = sender_vaddr; | |
8e669ac1 PH |
1873 | |
1874 | /* Restore the recipient address data, which might have been clobbered by | |
2a3eea10 | 1875 | the sender verification. */ |
8e669ac1 | 1876 | |
2a3eea10 | 1877 | deliver_address_data = save_address_data; |
059ec3d9 | 1878 | } |
8e669ac1 | 1879 | |
2a3eea10 PH |
1880 | /* Put the sender address_data value into $sender_address_data */ |
1881 | ||
8e669ac1 | 1882 | sender_address_data = sender_vaddr->p.address_data; |
059ec3d9 PH |
1883 | } |
1884 | ||
1885 | /* A recipient address just gets a straightforward verify; again we must handle | |
1886 | the DEFER overrides. */ | |
1887 | ||
1888 | else | |
1889 | { | |
1890 | address_item addr2; | |
1891 | ||
eafd343b TK |
1892 | if (success_on_redirect) |
1893 | verify_options |= vopt_success_on_redirect; | |
1894 | ||
059ec3d9 PH |
1895 | /* We must use a copy of the address for verification, because it might |
1896 | get rewritten. */ | |
1897 | ||
1898 | addr2 = *addr; | |
1899 | rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout, | |
4deaf07d | 1900 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, NULL); |
059ec3d9 | 1901 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); |
8e669ac1 | 1902 | |
059ec3d9 | 1903 | *log_msgptr = addr2.message; |
8e669ac1 | 1904 | *user_msgptr = (addr2.user_message != NULL)? |
6729cf78 | 1905 | addr2.user_message : addr2.message; |
059ec3d9 PH |
1906 | *basic_errno = addr2.basic_errno; |
1907 | ||
1908 | /* Make $address_data visible */ | |
1909 | deliver_address_data = addr2.p.address_data; | |
1910 | } | |
1911 | ||
1912 | /* We have a result from the relevant test. Handle defer overrides first. */ | |
1913 | ||
1914 | if (rc == DEFER && (defer_ok || | |
1915 | (callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER))) | |
1916 | { | |
1917 | HDEBUG(D_acl) debug_printf("verify defer overridden by %s\n", | |
1918 | defer_ok? "defer_ok" : "callout_defer_ok"); | |
1919 | rc = OK; | |
1920 | } | |
1921 | ||
1922 | /* If we've failed a sender, set up a recipient message, and point | |
1923 | sender_verified_failed to the address item that actually failed. */ | |
1924 | ||
1925 | if (rc != OK && verify_sender_address != NULL) | |
1926 | { | |
1927 | if (rc != DEFER) | |
1928 | { | |
1929 | *log_msgptr = *user_msgptr = US"Sender verify failed"; | |
1930 | } | |
1931 | else if (*basic_errno != ERRNO_CALLOUTDEFER) | |
1932 | { | |
1933 | *log_msgptr = *user_msgptr = US"Could not complete sender verify"; | |
1934 | } | |
1935 | else | |
1936 | { | |
1937 | *log_msgptr = US"Could not complete sender verify callout"; | |
1938 | *user_msgptr = smtp_return_error_details? sender_vaddr->user_message : | |
1939 | *log_msgptr; | |
1940 | } | |
1941 | ||
1942 | sender_verified_failed = sender_vaddr; | |
1943 | } | |
1944 | ||
1945 | /* Verifying an address messes up the values of $domain and $local_part, | |
1946 | so reset them before returning if this is a RCPT ACL. */ | |
1947 | ||
1948 | if (addr != NULL) | |
1949 | { | |
1950 | deliver_domain = addr->domain; | |
1951 | deliver_localpart = addr->local_part; | |
1952 | } | |
1953 | return rc; | |
1954 | ||
1955 | /* Syntax errors in the verify argument come here. */ | |
1956 | ||
1957 | BAD_VERIFY: | |
1958 | *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", " | |
596875b3 PH |
1959 | "\"helo\", \"header_syntax\", \"header_sender\" or " |
1960 | "\"reverse_host_lookup\" at start of ACL condition " | |
059ec3d9 PH |
1961 | "\"verify %s\"", arg); |
1962 | return ERROR; | |
596875b3 PH |
1963 | |
1964 | /* Options supplied when not allowed come here */ | |
1965 | ||
1966 | NO_OPTIONS: | |
1967 | *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" " | |
1968 | "(this verify item has no options)", arg); | |
1969 | return ERROR; | |
1c41c9cc PH |
1970 | |
1971 | /* Calls in the wrong ACL come here */ | |
1972 | ||
1973 | WRONG_ACL: | |
1974 | *log_msgptr = string_sprintf("cannot check header contents in ACL for %s " | |
1975 | "(only possible in ACL for DATA)", acl_wherenames[where]); | |
1976 | return ERROR; | |
059ec3d9 PH |
1977 | } |
1978 | ||
1979 | ||
1980 | ||
1981 | ||
1982 | /************************************************* | |
1983 | * Check argument for control= modifier * | |
1984 | *************************************************/ | |
1985 | ||
1986 | /* Called from acl_check_condition() below | |
1987 | ||
1988 | Arguments: | |
1989 | arg the argument string for control= | |
1990 | pptr set to point to the terminating character | |
1991 | where which ACL we are in | |
1992 | log_msgptr for error messages | |
1993 | ||
1994 | Returns: CONTROL_xxx value | |
1995 | */ | |
1996 | ||
1997 | static int | |
1998 | decode_control(uschar *arg, uschar **pptr, int where, uschar **log_msgptr) | |
1999 | { | |
2000 | int len; | |
2001 | control_def *d; | |
2002 | ||
2003 | for (d = controls_list; | |
2004 | d < controls_list + sizeof(controls_list)/sizeof(control_def); | |
2005 | d++) | |
2006 | { | |
2007 | len = Ustrlen(d->name); | |
2008 | if (Ustrncmp(d->name, arg, len) == 0) break; | |
2009 | } | |
2010 | ||
2011 | if (d >= controls_list + sizeof(controls_list)/sizeof(control_def) || | |
2012 | (arg[len] != 0 && (!d->has_option || arg[len] != '/'))) | |
2013 | { | |
2014 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2015 | return CONTROL_ERROR; | |
2016 | } | |
2017 | ||
059ec3d9 PH |
2018 | *pptr = arg + len; |
2019 | return d->value; | |
2020 | } | |
2021 | ||
2022 | ||
2023 | ||
870f6ba8 TF |
2024 | /************************************************* |
2025 | * Handle rate limiting * | |
2026 | *************************************************/ | |
2027 | ||
2028 | /* Called by acl_check_condition() below to calculate the result | |
2029 | of the ACL ratelimit condition. | |
2030 | ||
2031 | Note that the return value might be slightly unexpected: if the | |
2032 | sender's rate is above the limit then the result is OK. This is | |
2033 | similar to the dnslists condition, and is so that you can write | |
2034 | ACL clauses like: defer ratelimit = 15 / 1h | |
2035 | ||
2036 | Arguments: | |
2037 | arg the option string for ratelimit= | |
2038 | log_msgptr for error messages | |
2039 | ||
2040 | Returns: OK - Sender's rate is above limit | |
2041 | FAIL - Sender's rate is below limit | |
2042 | DEFER - Problem opening ratelimit database | |
2043 | ERROR - Syntax error in options. | |
2044 | */ | |
2045 | ||
2046 | static int | |
2047 | acl_ratelimit(uschar *arg, uschar **log_msgptr) | |
2048 | { | |
2049 | double limit, period; | |
f3dcf4a2 | 2050 | uschar *ss, *key; |
870f6ba8 TF |
2051 | int sep = '/'; |
2052 | BOOL have_key = FALSE, leaky = FALSE, strict = FALSE; | |
2053 | BOOL per_byte = FALSE, per_cmd = FALSE, per_conn = FALSE, per_mail = FALSE; | |
2054 | int old_pool, rc; | |
2055 | tree_node **anchor, *t; | |
2056 | open_db dbblock, *dbm; | |
2057 | dbdata_ratelimit *dbd; | |
2058 | struct timeval tv; | |
2059 | ||
2060 | /* Parse the first two options and record their values in expansion | |
2061 | variables. These variables allow the configuration to have informative | |
2062 | error messages based on rate limits obtained from a table lookup. */ | |
2063 | ||
2064 | /* First is the maximum number of messages per period and maximum burst | |
2065 | size, which must be greater than or equal to zero. Zero is useful for | |
2066 | rate measurement as opposed to rate limiting. */ | |
2067 | ||
2068 | sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0); | |
2069 | if (sender_rate_limit == NULL) | |
2070 | limit = -1.0; | |
2071 | else | |
2072 | { | |
2073 | limit = Ustrtod(sender_rate_limit, &ss); | |
2074 | if (tolower(*ss) == 'k') { limit *= 1024.0; ss++; } | |
2075 | else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; } | |
2076 | else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; } | |
2077 | } | |
2078 | if (limit < 0.0 || *ss != 0) | |
2079 | { | |
2080 | *log_msgptr = string_sprintf("syntax error in argument for " | |
2081 | "\"ratelimit\" condition: \"%s\" is not a positive number", | |
2082 | sender_rate_limit); | |
2083 | return ERROR; | |
2084 | } | |
2085 | ||
f3dcf4a2 TF |
2086 | /* We use the rest of the argument list following the limit as the |
2087 | lookup key, because it doesn't make sense to use the same stored data | |
2088 | if the period or options are different. */ | |
2089 | ||
2090 | key = arg; | |
2091 | ||
870f6ba8 TF |
2092 | /* Second is the rate measurement period and exponential smoothing time |
2093 | constant. This must be strictly greater than zero, because zero leads to | |
2094 | run-time division errors. */ | |
2095 | ||
2096 | sender_rate_period = string_nextinlist(&arg, &sep, NULL, 0); | |
2097 | if (sender_rate_period == NULL) period = -1.0; | |
2098 | else period = readconf_readtime(sender_rate_period, 0, FALSE); | |
2099 | if (period <= 0.0) | |
2100 | { | |
2101 | *log_msgptr = string_sprintf("syntax error in argument for " | |
2102 | "\"ratelimit\" condition: \"%s\" is not a time value", | |
2103 | sender_rate_period); | |
2104 | return ERROR; | |
2105 | } | |
2106 | ||
2107 | /* Parse the other options. Should we check if the per_* options are being | |
2108 | used in ACLs where they don't make sense, e.g. per_mail in the connect ACL? */ | |
2109 | ||
2110 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2111 | != NULL) | |
2112 | { | |
2113 | if (strcmpic(ss, US"leaky") == 0) leaky = TRUE; | |
2114 | else if (strcmpic(ss, US"strict") == 0) strict = TRUE; | |
2115 | else if (strcmpic(ss, US"per_byte") == 0) per_byte = TRUE; | |
2116 | else if (strcmpic(ss, US"per_cmd") == 0) per_cmd = TRUE; | |
2117 | else if (strcmpic(ss, US"per_conn") == 0) per_conn = TRUE; | |
2118 | else if (strcmpic(ss, US"per_mail") == 0) per_mail = TRUE; | |
2119 | else if (strcmpic(ss, US"per_rcpt") == 0) per_cmd = TRUE; /* alias */ | |
2120 | else have_key = TRUE; | |
2121 | } | |
2122 | if (leaky + strict > 1 || per_byte + per_cmd + per_conn + per_mail > 1) | |
2123 | { | |
2124 | *log_msgptr = US"conflicting options for \"ratelimit\" condition"; | |
2125 | return ERROR; | |
2126 | } | |
2127 | ||
2128 | /* Default option values */ | |
2129 | if (!strict) leaky = TRUE; | |
2130 | if (!per_byte && !per_cmd && !per_conn) per_mail = TRUE; | |
2131 | ||
f3dcf4a2 | 2132 | /* If there is no explicit key, use the sender_host_address. If there is no |
870f6ba8 TF |
2133 | sender_host_address (e.g. -bs or acl_not_smtp) then we simply omit it. */ |
2134 | ||
2135 | if (!have_key && sender_host_address != NULL) | |
2136 | key = string_sprintf("%s / %s", key, sender_host_address); | |
2137 | ||
2138 | HDEBUG(D_acl) debug_printf("ratelimit condition limit=%.0f period=%.0f key=%s\n", | |
2139 | limit, period, key); | |
2140 | ||
fe0dab11 | 2141 | /* See if we have already computed the rate by looking in the relevant tree. For |
870f6ba8 TF |
2142 | per-connection rate limiting, store tree nodes and dbdata in the permanent pool |
2143 | so that they survive across resets. */ | |
2144 | ||
2145 | anchor = NULL; | |
2146 | old_pool = store_pool; | |
2147 | ||
2148 | if (per_conn) | |
2149 | { | |
2150 | anchor = &ratelimiters_conn; | |
2151 | store_pool = POOL_PERM; | |
2152 | } | |
fe0dab11 | 2153 | else if (per_mail || per_byte) |
870f6ba8 | 2154 | anchor = &ratelimiters_mail; |
fe0dab11 TF |
2155 | else if (per_cmd) |
2156 | anchor = &ratelimiters_cmd; | |
870f6ba8 TF |
2157 | |
2158 | if (anchor != NULL && (t = tree_search(*anchor, key)) != NULL) | |
2159 | { | |
2160 | dbd = t->data.ptr; | |
2161 | /* The following few lines duplicate some of the code below. */ | |
3348576f TF |
2162 | if (dbd->rate < limit) rc = FAIL; |
2163 | else rc = OK; | |
870f6ba8 TF |
2164 | store_pool = old_pool; |
2165 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2166 | HDEBUG(D_acl) | |
2167 | debug_printf("ratelimit found pre-computed rate %s\n", sender_rate); | |
2168 | return rc; | |
2169 | } | |
2170 | ||
2171 | /* We aren't using a pre-computed rate, so get a previously recorded | |
2172 | rate from the database, update it, and write it back. If there's no | |
2173 | previous rate for this key, create one. */ | |
2174 | ||
2175 | dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE); | |
2176 | if (dbm == NULL) | |
2177 | { | |
2178 | store_pool = old_pool; | |
2179 | sender_rate = NULL; | |
2180 | HDEBUG(D_acl) debug_printf("ratelimit database not available\n"); | |
2181 | *log_msgptr = US"ratelimit database not available"; | |
2182 | return DEFER; | |
2183 | } | |
2184 | dbd = dbfn_read(dbm, key); | |
2185 | ||
2186 | gettimeofday(&tv, NULL); | |
2187 | ||
2188 | if (dbd == NULL) | |
2189 | { | |
2190 | HDEBUG(D_acl) debug_printf("ratelimit initializing new key's data\n"); | |
2191 | dbd = store_get(sizeof(dbdata_ratelimit)); | |
2192 | dbd->time_stamp = tv.tv_sec; | |
2193 | dbd->time_usec = tv.tv_usec; | |
2194 | dbd->rate = 0.0; | |
2195 | } | |
2196 | else | |
2197 | { | |
2198 | /* The smoothed rate is computed using an exponentially weighted moving | |
2199 | average adjusted for variable sampling intervals. The standard EWMA for | |
2200 | a fixed sampling interval is: f'(t) = (1 - a) * f(t) + a * f'(t - 1) | |
2201 | where f() is the measured value and f'() is the smoothed value. | |
2202 | ||
2203 | Old data decays out of the smoothed value exponentially, such that data n | |
2204 | samples old is multiplied by a^n. The exponential decay time constant p | |
2205 | is defined such that data p samples old is multiplied by 1/e, which means | |
2206 | that a = exp(-1/p). We can maintain the same time constant for a variable | |
2207 | sampling interval i by using a = exp(-i/p). | |
2208 | ||
2209 | The rate we are measuring is messages per period, suitable for directly | |
2210 | comparing with the limit. The average rate between now and the previous | |
2211 | message is period / interval, which we feed into the EWMA as the sample. | |
2212 | ||
2213 | It turns out that the number of messages required for the smoothed rate | |
2214 | to reach the limit when they are sent in a burst is equal to the limit. | |
2215 | This can be seen by analysing the value of the smoothed rate after N | |
2216 | messages sent at even intervals. Let k = (1 - a) * p/i | |
2217 | ||
2218 | rate_1 = (1 - a) * p/i + a * rate_0 | |
2219 | = k + a * rate_0 | |
2220 | rate_2 = k + a * rate_1 | |
2221 | = k + a * k + a^2 * rate_0 | |
2222 | rate_3 = k + a * k + a^2 * k + a^3 * rate_0 | |
2223 | rate_N = rate_0 * a^N + k * SUM(x=0..N-1)(a^x) | |
2224 | = rate_0 * a^N + k * (1 - a^N) / (1 - a) | |
2225 | = rate_0 * a^N + p/i * (1 - a^N) | |
2226 | ||
2227 | When N is large, a^N -> 0 so rate_N -> p/i as desired. | |
2228 | ||
2229 | rate_N = p/i + (rate_0 - p/i) * a^N | |
2230 | a^N = (rate_N - p/i) / (rate_0 - p/i) | |
2231 | N * -i/p = log((rate_N - p/i) / (rate_0 - p/i)) | |
2232 | N = p/i * log((rate_0 - p/i) / (rate_N - p/i)) | |
2233 | ||
2234 | Numerical analysis of the above equation, setting the computed rate to | |
2235 | increase from rate_0 = 0 to rate_N = limit, shows that for large sending | |
2236 | rates, p/i, the number of messages N = limit. So limit serves as both the | |
2237 | maximum rate measured in messages per period, and the maximum number of | |
2238 | messages that can be sent in a fast burst. */ | |
2239 | ||
2240 | double this_time = (double)tv.tv_sec | |
2241 | + (double)tv.tv_usec / 1000000.0; | |
2242 | double prev_time = (double)dbd->time_stamp | |
2243 | + (double)dbd->time_usec / 1000000.0; | |
870f6ba8 TF |
2244 | |
2245 | /* We must avoid division by zero, and deal gracefully with the clock going | |
2246 | backwards. If we blunder ahead when time is in reverse then the computed | |
e5d5a95f | 2247 | rate will be bogus. To be safe we clamp interval to a very small number. */ |
870f6ba8 | 2248 | |
e5d5a95f TF |
2249 | double interval = this_time - prev_time <= 0.0 ? 1e-9 |
2250 | : this_time - prev_time; | |
2251 | ||
2252 | double i_over_p = interval / period; | |
2253 | double a = exp(-i_over_p); | |
870f6ba8 TF |
2254 | |
2255 | dbd->time_stamp = tv.tv_sec; | |
2256 | dbd->time_usec = tv.tv_usec; | |
2257 | ||
2258 | /* If we are measuring the rate in bytes per period, multiply the | |
2259 | measured rate by the message size. If we don't know the message size | |
2260 | then it's safe to just use a value of zero and let the recorded rate | |
2261 | decay as if nothing happened. */ | |
2262 | ||
2263 | if (per_byte) | |
2264 | dbd->rate = (message_size < 0 ? 0.0 : (double)message_size) | |
2265 | * (1 - a) / i_over_p + a * dbd->rate; | |
2266 | else | |
2267 | dbd->rate = (1 - a) / i_over_p + a * dbd->rate; | |
2268 | } | |
2269 | ||
3348576f TF |
2270 | /* Clients sending at the limit are considered to be over the limit. This |
2271 | matters for edge cases such the first message sent by a client (which gets | |
2272 | the initial rate of 0.0) when the rate limit is zero (i.e. the client should | |
2273 | be completely blocked). */ | |
2274 | ||
2275 | if (dbd->rate < limit) rc = FAIL; | |
2276 | else rc = OK; | |
870f6ba8 TF |
2277 | |
2278 | /* Update the state if the rate is low or if we are being strict. If we | |
2279 | are in leaky mode and the sender's rate is too high, we do not update | |
2280 | the recorded rate in order to avoid an over-aggressive sender's retry | |
2281 | rate preventing them from getting any email through. */ | |
2282 | ||
2283 | if (rc == FAIL || !leaky) | |
2284 | dbfn_write(dbm, key, dbd, sizeof(dbdata_ratelimit)); | |
2285 | dbfn_close(dbm); | |
2286 | ||
2287 | /* Store the result in the tree for future reference, if necessary. */ | |
2288 | ||
2289 | if (anchor != NULL) | |
2290 | { | |
2291 | t = store_get(sizeof(tree_node) + Ustrlen(key)); | |
2292 | t->data.ptr = dbd; | |
2293 | Ustrcpy(t->name, key); | |
2294 | (void)tree_insertnode(anchor, t); | |
2295 | } | |
2296 | ||
2297 | /* We create the formatted version of the sender's rate very late in | |
2298 | order to ensure that it is done using the correct storage pool. */ | |
2299 | ||
2300 | store_pool = old_pool; | |
2301 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2302 | ||
2303 | HDEBUG(D_acl) | |
2304 | debug_printf("ratelimit computed rate %s\n", sender_rate); | |
2305 | ||
2306 | return rc; | |
2307 | } | |
2308 | ||
2309 | ||
2310 | ||
059ec3d9 PH |
2311 | /************************************************* |
2312 | * Handle conditions/modifiers on an ACL item * | |
2313 | *************************************************/ | |
2314 | ||
2315 | /* Called from acl_check() below. | |
2316 | ||
2317 | Arguments: | |
2318 | verb ACL verb | |
2319 | cb ACL condition block - if NULL, result is OK | |
2320 | where where called from | |
2321 | addr the address being checked for RCPT, or NULL | |
2322 | level the nesting level | |
2323 | epp pointer to pass back TRUE if "endpass" encountered | |
2324 | (applies only to "accept" and "discard") | |
2325 | user_msgptr user message pointer | |
2326 | log_msgptr log message pointer | |
2327 | basic_errno pointer to where to put verify error | |
2328 | ||
2329 | Returns: OK - all conditions are met | |
2330 | DISCARD - an "acl" condition returned DISCARD - only allowed | |
2331 | for "accept" or "discard" verbs | |
2332 | FAIL - at least one condition fails | |
2333 | FAIL_DROP - an "acl" condition returned FAIL_DROP | |
2334 | DEFER - can't tell at the moment (typically, lookup defer, | |
2335 | but can be temporary callout problem) | |
2336 | ERROR - ERROR from nested ACL or expansion failure or other | |
2337 | error | |
2338 | */ | |
2339 | ||
2340 | static int | |
2341 | acl_check_condition(int verb, acl_condition_block *cb, int where, | |
2342 | address_item *addr, int level, BOOL *epp, uschar **user_msgptr, | |
2343 | uschar **log_msgptr, int *basic_errno) | |
2344 | { | |
2345 | uschar *user_message = NULL; | |
2346 | uschar *log_message = NULL; | |
2347 | uschar *p; | |
2348 | int rc = OK; | |
8523533c TK |
2349 | #ifdef WITH_CONTENT_SCAN |
2350 | int sep = '/'; | |
2351 | #endif | |
059ec3d9 PH |
2352 | |
2353 | for (; cb != NULL; cb = cb->next) | |
2354 | { | |
2355 | uschar *arg; | |
8e669ac1 | 2356 | int control_type; |
059ec3d9 PH |
2357 | |
2358 | /* The message and log_message items set up messages to be used in | |
2359 | case of rejection. They are expanded later. */ | |
2360 | ||
2361 | if (cb->type == ACLC_MESSAGE) | |
2362 | { | |
2363 | user_message = cb->arg; | |
2364 | continue; | |
2365 | } | |
2366 | ||
2367 | if (cb->type == ACLC_LOG_MESSAGE) | |
2368 | { | |
2369 | log_message = cb->arg; | |
2370 | continue; | |
2371 | } | |
2372 | ||
2373 | /* The endpass "condition" just sets a flag to show it occurred. This is | |
2374 | checked at compile time to be on an "accept" or "discard" item. */ | |
2375 | ||
2376 | if (cb->type == ACLC_ENDPASS) | |
2377 | { | |
2378 | *epp = TRUE; | |
2379 | continue; | |
2380 | } | |
2381 | ||
2382 | /* For other conditions and modifiers, the argument is expanded now for some | |
2383 | of them, but not for all, because expansion happens down in some lower level | |
2384 | checking functions in some cases. */ | |
2385 | ||
2386 | if (cond_expand_at_top[cb->type]) | |
2387 | { | |
2388 | arg = expand_string(cb->arg); | |
2389 | if (arg == NULL) | |
2390 | { | |
2391 | if (expand_string_forcedfail) continue; | |
2392 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
2393 | cb->arg, expand_string_message); | |
2394 | return search_find_defer? DEFER : ERROR; | |
2395 | } | |
2396 | } | |
2397 | else arg = cb->arg; | |
2398 | ||
2399 | /* Show condition, and expanded condition if it's different */ | |
2400 | ||
2401 | HDEBUG(D_acl) | |
2402 | { | |
2403 | int lhswidth = 0; | |
2404 | debug_printf("check %s%s %n", | |
2405 | (!cond_modifiers[cb->type] && cb->u.negated)? "!":"", | |
2406 | conditions[cb->type], &lhswidth); | |
2407 | ||
2408 | if (cb->type == ACLC_SET) | |
2409 | { | |
2410 | int n = cb->u.varnumber; | |
47ca6d6c PH |
2411 | int t = (n < ACL_CVARS)? 'c' : 'm'; |
2412 | if (n >= ACL_CVARS) n -= ACL_CVARS; | |
059ec3d9 PH |
2413 | debug_printf("acl_%c%d ", t, n); |
2414 | lhswidth += 7; | |
2415 | } | |
2416 | ||
2417 | debug_printf("= %s\n", cb->arg); | |
2418 | ||
2419 | if (arg != cb->arg) | |
2420 | debug_printf("%.*s= %s\n", lhswidth, | |
2421 | US" ", CS arg); | |
2422 | } | |
2423 | ||
2424 | /* Check that this condition makes sense at this time */ | |
2425 | ||
2426 | if ((cond_forbids[cb->type] & (1 << where)) != 0) | |
2427 | { | |
2428 | *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL", | |
2429 | cond_modifiers[cb->type]? "use" : "test", | |
2430 | conditions[cb->type], acl_wherenames[where]); | |
2431 | return ERROR; | |
2432 | } | |
2433 | ||
2434 | /* Run the appropriate test for each condition, or take the appropriate | |
2435 | action for the remaining modifiers. */ | |
2436 | ||
2437 | switch(cb->type) | |
2438 | { | |
71fafd95 PH |
2439 | case ACLC_ADD_HEADER: |
2440 | setup_header(arg); | |
2441 | break; | |
2442 | ||
059ec3d9 PH |
2443 | /* A nested ACL that returns "discard" makes sense only for an "accept" or |
2444 | "discard" verb. */ | |
71fafd95 | 2445 | |
059ec3d9 PH |
2446 | case ACLC_ACL: |
2447 | rc = acl_check_internal(where, addr, arg, level+1, user_msgptr, log_msgptr); | |
2448 | if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD) | |
2449 | { | |
2450 | *log_msgptr = string_sprintf("nested ACL returned \"discard\" for " | |
2451 | "\"%s\" command (only allowed with \"accept\" or \"discard\")", | |
2452 | verbs[verb]); | |
2453 | return ERROR; | |
2454 | } | |
2455 | break; | |
2456 | ||
2457 | case ACLC_AUTHENTICATED: | |
2458 | rc = (sender_host_authenticated == NULL)? FAIL : | |
2459 | match_isinlist(sender_host_authenticated, &arg, 0, NULL, NULL, MCL_STRING, | |
2460 | TRUE, NULL); | |
2461 | break; | |
2462 | ||
71fafd95 | 2463 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
8523533c TK |
2464 | case ACLC_BMI_OPTIN: |
2465 | { | |
2466 | int old_pool = store_pool; | |
2467 | store_pool = POOL_PERM; | |
2468 | bmi_current_optin = string_copy(arg); | |
2469 | store_pool = old_pool; | |
2470 | } | |
2471 | break; | |
71fafd95 | 2472 | #endif |
8523533c | 2473 | |
059ec3d9 PH |
2474 | case ACLC_CONDITION: |
2475 | if (Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */ | |
2476 | rc = (Uatoi(arg) == 0)? FAIL : OK; | |
2477 | else | |
2478 | rc = (strcmpic(arg, US"no") == 0 || | |
2479 | strcmpic(arg, US"false") == 0)? FAIL : | |
2480 | (strcmpic(arg, US"yes") == 0 || | |
2481 | strcmpic(arg, US"true") == 0)? OK : DEFER; | |
2482 | if (rc == DEFER) | |
2483 | *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg); | |
2484 | break; | |
2485 | ||
2486 | case ACLC_CONTROL: | |
c5fcb476 PH |
2487 | control_type = decode_control(arg, &p, where, log_msgptr); |
2488 | ||
8523533c | 2489 | /* Check if this control makes sense at this time */ |
c5fcb476 PH |
2490 | |
2491 | if ((control_forbids[control_type] & (1 << where)) != 0) | |
2492 | { | |
2493 | *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL", | |
2494 | controls[control_type], acl_wherenames[where]); | |
2495 | return ERROR; | |
8e669ac1 | 2496 | } |
c5fcb476 PH |
2497 | |
2498 | switch(control_type) | |
059ec3d9 | 2499 | { |
c46782ef PH |
2500 | case CONTROL_AUTH_UNADVERTISED: |
2501 | allow_auth_unadvertised = TRUE; | |
2502 | break; | |
2503 | ||
2504 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
8523533c TK |
2505 | case CONTROL_BMI_RUN: |
2506 | bmi_run = 1; | |
2507 | break; | |
c46782ef PH |
2508 | #endif |
2509 | ||
2510 | #ifdef EXPERIMENTAL_DOMAINKEYS | |
fb2274d4 TK |
2511 | case CONTROL_DK_VERIFY: |
2512 | dk_do_verify = 1; | |
2513 | break; | |
c46782ef PH |
2514 | #endif |
2515 | ||
059ec3d9 PH |
2516 | case CONTROL_ERROR: |
2517 | return ERROR; | |
2518 | ||
2519 | case CONTROL_CASEFUL_LOCAL_PART: | |
2520 | deliver_localpart = addr->cc_local_part; | |
2521 | break; | |
2522 | ||
2523 | case CONTROL_CASELOWER_LOCAL_PART: | |
2524 | deliver_localpart = addr->lc_local_part; | |
2525 | break; | |
2526 | ||
2527 | case CONTROL_ENFORCE_SYNC: | |
2528 | smtp_enforce_sync = TRUE; | |
2529 | break; | |
2530 | ||
2531 | case CONTROL_NO_ENFORCE_SYNC: | |
2532 | smtp_enforce_sync = FALSE; | |
2533 | break; | |
2534 | ||
c46782ef | 2535 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
2536 | case CONTROL_NO_MBOX_UNSPOOL: |
2537 | no_mbox_unspool = TRUE; | |
2538 | break; | |
c46782ef | 2539 | #endif |
8523533c | 2540 | |
059ec3d9 PH |
2541 | case CONTROL_NO_MULTILINE: |
2542 | no_multiline_responses = TRUE; | |
2543 | break; | |
2544 | ||
29aba418 | 2545 | case CONTROL_FAKEDEFER: |
8523533c | 2546 | case CONTROL_FAKEREJECT: |
29aba418 | 2547 | fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL; |
8523533c | 2548 | if (*p == '/') |
8e669ac1 | 2549 | { |
8523533c | 2550 | uschar *pp = p + 1; |
8e669ac1 | 2551 | while (*pp != 0) pp++; |
29aba418 | 2552 | fake_response_text = expand_string(string_copyn(p+1, pp-p-1)); |
8523533c TK |
2553 | p = pp; |
2554 | } | |
2555 | else | |
2556 | { | |
2557 | /* Explicitly reset to default string */ | |
29aba418 | 2558 | fake_response_text = US"Your message has been rejected but is being kept for evaluation.\nIf it was a legitimate message, it may still be delivered to the target recipient(s)."; |
8523533c TK |
2559 | } |
2560 | break; | |
8523533c | 2561 | |
059ec3d9 PH |
2562 | case CONTROL_FREEZE: |
2563 | deliver_freeze = TRUE; | |
2564 | deliver_frozen_at = time(NULL); | |
6a3f1455 PH |
2565 | freeze_tell = freeze_tell_config; /* Reset to configured value */ |
2566 | if (Ustrncmp(p, "/no_tell", 8) == 0) | |
2567 | { | |
2568 | p += 8; | |
2569 | freeze_tell = NULL; | |
2570 | } | |
2571 | if (*p != 0) | |
2572 | { | |
2573 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2574 | return ERROR; | |
2575 | } | |
059ec3d9 PH |
2576 | break; |
2577 | ||
2578 | case CONTROL_QUEUE_ONLY: | |
2579 | queue_only_policy = TRUE; | |
2580 | break; | |
2581 | ||
2582 | case CONTROL_SUBMISSION: | |
87ba3f5f | 2583 | originator_name = US""; |
059ec3d9 | 2584 | submission_mode = TRUE; |
69358f02 | 2585 | while (*p == '/') |
8e669ac1 | 2586 | { |
69358f02 PH |
2587 | if (Ustrncmp(p, "/sender_retain", 14) == 0) |
2588 | { | |
2589 | p += 14; | |
2590 | active_local_sender_retain = TRUE; | |
8e669ac1 PH |
2591 | active_local_from_check = FALSE; |
2592 | } | |
69358f02 PH |
2593 | else if (Ustrncmp(p, "/domain=", 8) == 0) |
2594 | { | |
2595 | uschar *pp = p + 8; | |
8e669ac1 | 2596 | while (*pp != 0 && *pp != '/') pp++; |
87ba3f5f PH |
2597 | submission_domain = string_copyn(p+8, pp-p-8); |
2598 | p = pp; | |
2599 | } | |
8857ccfd PH |
2600 | /* The name= option must be last, because it swallows the rest of |
2601 | the string. */ | |
87ba3f5f PH |
2602 | else if (Ustrncmp(p, "/name=", 6) == 0) |
2603 | { | |
2604 | uschar *pp = p + 6; | |
8857ccfd | 2605 | while (*pp != 0) pp++; |
2fe1a124 | 2606 | submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6, |
87ba3f5f | 2607 | big_buffer, big_buffer_size)); |
8e669ac1 | 2608 | p = pp; |
69358f02 | 2609 | } |
8e669ac1 PH |
2610 | else break; |
2611 | } | |
69358f02 | 2612 | if (*p != 0) |
059ec3d9 | 2613 | { |
69358f02 | 2614 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); |
059ec3d9 PH |
2615 | return ERROR; |
2616 | } | |
2617 | break; | |
8800895a PH |
2618 | |
2619 | case CONTROL_SUPPRESS_LOCAL_FIXUPS: | |
2620 | suppress_local_fixups = TRUE; | |
2621 | break; | |
059ec3d9 PH |
2622 | } |
2623 | break; | |
2624 | ||
71fafd95 | 2625 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
2626 | case ACLC_DECODE: |
2627 | rc = mime_decode(&arg); | |
2628 | break; | |
71fafd95 | 2629 | #endif |
8523533c | 2630 | |
059ec3d9 PH |
2631 | case ACLC_DELAY: |
2632 | { | |
2633 | int delay = readconf_readtime(arg, 0, FALSE); | |
2634 | if (delay < 0) | |
2635 | { | |
2636 | *log_msgptr = string_sprintf("syntax error in argument for \"delay\" " | |
2637 | "modifier: \"%s\" is not a time value", arg); | |
2638 | return ERROR; | |
2639 | } | |
2640 | else | |
2641 | { | |
2642 | HDEBUG(D_acl) debug_printf("delay modifier requests %d-second delay\n", | |
2643 | delay); | |
2644 | if (host_checking) | |
2645 | { | |
2646 | HDEBUG(D_acl) | |
2647 | debug_printf("delay skipped in -bh checking mode\n"); | |
2648 | } | |
010c2d14 PH |
2649 | |
2650 | /* It appears to be impossible to detect that a TCP/IP connection has | |
2651 | gone away without reading from it. This means that we cannot shorten | |
2652 | the delay below if the client goes away, because we cannot discover | |
2653 | that the client has closed its end of the connection. (The connection | |
2654 | is actually in a half-closed state, waiting for the server to close its | |
2655 | end.) It would be nice to be able to detect this state, so that the | |
2656 | Exim process is not held up unnecessarily. However, it seems that we | |
2657 | can't. The poll() function does not do the right thing, and in any case | |
2658 | it is not always available. | |
2659 | ||
2660 | NOTE: If ever this state of affairs changes, remember that we may be | |
2661 | dealing with stdin/stdout here, in addition to TCP/IP connections. | |
2662 | Whatever is done must work in both cases. To detected the stdin/stdout | |
2663 | case, check for smtp_in or smtp_out being NULL. */ | |
2664 | ||
8e669ac1 | 2665 | else |
86b8287f PH |
2666 | { |
2667 | while (delay > 0) delay = sleep(delay); | |
8e669ac1 | 2668 | } |
059ec3d9 PH |
2669 | } |
2670 | } | |
2671 | break; | |
2672 | ||
71fafd95 | 2673 | #ifdef WITH_OLD_DEMIME |
8523533c TK |
2674 | case ACLC_DEMIME: |
2675 | rc = demime(&arg); | |
2676 | break; | |
71fafd95 | 2677 | #endif |
8523533c | 2678 | |
71fafd95 PH |
2679 | #ifdef EXPERIMENTAL_DOMAINKEYS |
2680 | case ACLC_DK_DOMAIN_SOURCE: | |
fb2274d4 TK |
2681 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2682 | /* check header source of domain against given string */ | |
2683 | switch (dk_verify_block->address_source) { | |
2684 | case DK_EXIM_ADDRESS_FROM_FROM: | |
2685 | rc = match_isinlist(US"from", &arg, 0, NULL, | |
2686 | NULL, MCL_STRING, TRUE, NULL); | |
2687 | break; | |
2688 | case DK_EXIM_ADDRESS_FROM_SENDER: | |
2689 | rc = match_isinlist(US"sender", &arg, 0, NULL, | |
2690 | NULL, MCL_STRING, TRUE, NULL); | |
2691 | break; | |
2692 | case DK_EXIM_ADDRESS_NONE: | |
2693 | rc = match_isinlist(US"none", &arg, 0, NULL, | |
2694 | NULL, MCL_STRING, TRUE, NULL); | |
2695 | break; | |
71fafd95 PH |
2696 | } |
2697 | break; | |
2698 | ||
2699 | case ACLC_DK_POLICY: | |
fb2274d4 TK |
2700 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2701 | /* check policy against given string, default FAIL */ | |
2702 | rc = FAIL; | |
2703 | if (dk_verify_block->signsall) | |
2704 | rc = match_isinlist(US"signsall", &arg, 0, NULL, | |
2705 | NULL, MCL_STRING, TRUE, NULL); | |
2706 | if (dk_verify_block->testing) | |
2707 | rc = match_isinlist(US"testing", &arg, 0, NULL, | |
2708 | NULL, MCL_STRING, TRUE, NULL); | |
71fafd95 PH |
2709 | break; |
2710 | ||
2711 | case ACLC_DK_SENDER_DOMAINS: | |
fb2274d4 TK |
2712 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2713 | if (dk_verify_block->domain != NULL) | |
2714 | rc = match_isinlist(dk_verify_block->domain, &arg, 0, &domainlist_anchor, | |
2715 | NULL, MCL_DOMAIN, TRUE, NULL); | |
2716 | else rc = FAIL; | |
71fafd95 PH |
2717 | break; |
2718 | ||
2719 | case ACLC_DK_SENDER_LOCAL_PARTS: | |
fb2274d4 TK |
2720 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2721 | if (dk_verify_block->local_part != NULL) | |
2722 | rc = match_isinlist(dk_verify_block->local_part, &arg, 0, &localpartlist_anchor, | |
2723 | NULL, MCL_LOCALPART, TRUE, NULL); | |
2724 | else rc = FAIL; | |
71fafd95 PH |
2725 | break; |
2726 | ||
2727 | case ACLC_DK_SENDERS: | |
fb2274d4 TK |
2728 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2729 | if (dk_verify_block->address != NULL) | |
2730 | rc = match_address_list(dk_verify_block->address, TRUE, TRUE, &arg, NULL, -1, 0, NULL); | |
2731 | else rc = FAIL; | |
71fafd95 PH |
2732 | break; |
2733 | ||
2734 | case ACLC_DK_STATUS: | |
fb2274d4 TK |
2735 | if (dk_verify_block == NULL) { rc = FAIL; break; }; |
2736 | if (dk_verify_block->result > 0) { | |
2737 | switch(dk_verify_block->result) { | |
2738 | case DK_EXIM_RESULT_BAD_FORMAT: | |
2739 | rc = match_isinlist(US"bad format", &arg, 0, NULL, | |
2740 | NULL, MCL_STRING, TRUE, NULL); | |
2741 | break; | |
2742 | case DK_EXIM_RESULT_NO_KEY: | |
2743 | rc = match_isinlist(US"no key", &arg, 0, NULL, | |
2744 | NULL, MCL_STRING, TRUE, NULL); | |
2745 | break; | |
2746 | case DK_EXIM_RESULT_NO_SIGNATURE: | |
2747 | rc = match_isinlist(US"no signature", &arg, 0, NULL, | |
2748 | NULL, MCL_STRING, TRUE, NULL); | |
2749 | break; | |
2750 | case DK_EXIM_RESULT_REVOKED: | |
2751 | rc = match_isinlist(US"revoked", &arg, 0, NULL, | |
2752 | NULL, MCL_STRING, TRUE, NULL); | |
2753 | break; | |
2754 | case DK_EXIM_RESULT_NON_PARTICIPANT: | |
2755 | rc = match_isinlist(US"non-participant", &arg, 0, NULL, | |
2756 | NULL, MCL_STRING, TRUE, NULL); | |
2757 | break; | |
2758 | case DK_EXIM_RESULT_GOOD: | |
2759 | rc = match_isinlist(US"good", &arg, 0, NULL, | |
2760 | NULL, MCL_STRING, TRUE, NULL); | |
2761 | break; | |
2762 | case DK_EXIM_RESULT_BAD: | |
2763 | rc = match_isinlist(US"bad", &arg, 0, NULL, | |
2764 | NULL, MCL_STRING, TRUE, NULL); | |
2765 | break; | |
71fafd95 | 2766 | } |
fb2274d4 | 2767 | } |
71fafd95 PH |
2768 | break; |
2769 | #endif | |
fb2274d4 | 2770 | |
059ec3d9 PH |
2771 | case ACLC_DNSLISTS: |
2772 | rc = verify_check_dnsbl(&arg); | |
2773 | break; | |
2774 | ||
2775 | case ACLC_DOMAINS: | |
2776 | rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor, | |
2777 | addr->domain_cache, MCL_DOMAIN, TRUE, &deliver_domain_data); | |
2778 | break; | |
2779 | ||
2780 | /* The value in tls_cipher is the full cipher name, for example, | |
2781 | TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the | |
2782 | cipher names such as DES-CBC3-SHA. But program defensively. We don't know | |
2783 | what may in practice come out of the SSL library - which at the time of | |
2784 | writing is poorly documented. */ | |
2785 | ||
2786 | case ACLC_ENCRYPTED: | |
2787 | if (tls_cipher == NULL) rc = FAIL; else | |
2788 | { | |
2789 | uschar *endcipher = NULL; | |
2790 | uschar *cipher = Ustrchr(tls_cipher, ':'); | |
2791 | if (cipher == NULL) cipher = tls_cipher; else | |
2792 | { | |
2793 | endcipher = Ustrchr(++cipher, ':'); | |
2794 | if (endcipher != NULL) *endcipher = 0; | |
2795 | } | |
2796 | rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL); | |
2797 | if (endcipher != NULL) *endcipher = ':'; | |
2798 | } | |
2799 | break; | |
2800 | ||
2801 | /* Use verify_check_this_host() instead of verify_check_host() so that | |
2802 | we can pass over &host_data to catch any looked up data. Once it has been | |
2803 | set, it retains its value so that it's still there if another ACL verb | |
2804 | comes through here and uses the cache. However, we must put it into | |
2805 | permanent store in case it is also expected to be used in a subsequent | |
2806 | message in the same SMTP connection. */ | |
2807 | ||
2808 | case ACLC_HOSTS: | |
2809 | rc = verify_check_this_host(&arg, sender_host_cache, NULL, | |
2810 | (sender_host_address == NULL)? US"" : sender_host_address, &host_data); | |
2811 | if (host_data != NULL) host_data = string_copy_malloc(host_data); | |
2812 | break; | |
2813 | ||
2814 | case ACLC_LOCAL_PARTS: | |
2815 | rc = match_isinlist(addr->cc_local_part, &arg, 0, | |
2816 | &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE, | |
2817 | &deliver_localpart_data); | |
2818 | break; | |
2819 | ||
2820 | case ACLC_LOGWRITE: | |
2821 | { | |
2822 | int logbits = 0; | |
2823 | uschar *s = arg; | |
2824 | if (*s == ':') | |
2825 | { | |
2826 | s++; | |
2827 | while (*s != ':') | |
2828 | { | |
2829 | if (Ustrncmp(s, "main", 4) == 0) | |
2830 | { logbits |= LOG_MAIN; s += 4; } | |
2831 | else if (Ustrncmp(s, "panic", 5) == 0) | |
2832 | { logbits |= LOG_PANIC; s += 5; } | |
2833 | else if (Ustrncmp(s, "reject", 6) == 0) | |
2834 | { logbits |= LOG_REJECT; s += 6; } | |
2835 | else | |
2836 | { | |
2837 | logbits = LOG_MAIN|LOG_PANIC; | |
2838 | s = string_sprintf(":unknown log name in \"%s\" in " | |
2839 | "\"logwrite\" in %s ACL", arg, acl_wherenames[where]); | |
2840 | } | |
2841 | if (*s == ',') s++; | |
2842 | } | |
2843 | s++; | |
2844 | } | |
2845 | while (isspace(*s)) s++; | |
2846 | if (logbits == 0) logbits = LOG_MAIN; | |
2847 | log_write(0, logbits, "%s", string_printing(s)); | |
2848 | } | |
2849 | break; | |
8e669ac1 | 2850 | |
71fafd95 | 2851 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
2852 | case ACLC_MALWARE: |
2853 | { | |
2854 | /* Seperate the regular expression and any optional parameters. */ | |
2855 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); | |
2856 | /* Run the malware backend. */ | |
2857 | rc = malware(&ss); | |
2858 | /* Modify return code based upon the existance of options. */ | |
2859 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2860 | != NULL) { | |
2861 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
2862 | { | |
2863 | /* FAIL so that the message is passed to the next ACL */ | |
2864 | rc = FAIL; | |
2865 | } | |
2866 | } | |
2867 | } | |
2868 | break; | |
2869 | ||
2870 | case ACLC_MIME_REGEX: | |
71fafd95 | 2871 | rc = mime_regex(&arg); |
8523533c | 2872 | break; |
71fafd95 | 2873 | #endif |
059ec3d9 | 2874 | |
870f6ba8 | 2875 | case ACLC_RATELIMIT: |
71fafd95 | 2876 | rc = acl_ratelimit(arg, log_msgptr); |
870f6ba8 TF |
2877 | break; |
2878 | ||
059ec3d9 PH |
2879 | case ACLC_RECIPIENTS: |
2880 | rc = match_address_list(addr->address, TRUE, TRUE, &arg, NULL, -1, 0, | |
2881 | &recipient_data); | |
2882 | break; | |
2883 | ||
71fafd95 PH |
2884 | #ifdef WITH_CONTENT_SCAN |
2885 | case ACLC_REGEX: | |
2886 | rc = regex(&arg); | |
8523533c | 2887 | break; |
71fafd95 | 2888 | #endif |
8523533c | 2889 | |
059ec3d9 PH |
2890 | case ACLC_SENDER_DOMAINS: |
2891 | { | |
2892 | uschar *sdomain; | |
2893 | sdomain = Ustrrchr(sender_address, '@'); | |
2894 | sdomain = (sdomain == NULL)? US"" : sdomain + 1; | |
2895 | rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor, | |
2896 | sender_domain_cache, MCL_DOMAIN, TRUE, NULL); | |
2897 | } | |
2898 | break; | |
2899 | ||
2900 | case ACLC_SENDERS: | |
2901 | rc = match_address_list(sender_address, TRUE, TRUE, &arg, | |
2902 | sender_address_cache, -1, 0, &sender_data); | |
2903 | break; | |
2904 | ||
2905 | /* Connection variables must persist forever */ | |
2906 | ||
2907 | case ACLC_SET: | |
2908 | { | |
2909 | int old_pool = store_pool; | |
47ca6d6c | 2910 | if (cb->u.varnumber < ACL_CVARS) store_pool = POOL_PERM; |
059ec3d9 PH |
2911 | acl_var[cb->u.varnumber] = string_copy(arg); |
2912 | store_pool = old_pool; | |
2913 | } | |
2914 | break; | |
2915 | ||
71fafd95 | 2916 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
2917 | case ACLC_SPAM: |
2918 | { | |
2919 | /* Seperate the regular expression and any optional parameters. */ | |
2920 | uschar *ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size); | |
2921 | /* Run the spam backend. */ | |
2922 | rc = spam(&ss); | |
2923 | /* Modify return code based upon the existance of options. */ | |
2924 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2925 | != NULL) { | |
2926 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
2927 | { | |
2928 | /* FAIL so that the message is passed to the next ACL */ | |
2929 | rc = FAIL; | |
2930 | } | |
2931 | } | |
2932 | } | |
2933 | break; | |
71fafd95 | 2934 | #endif |
8523533c | 2935 | |
71fafd95 | 2936 | #ifdef EXPERIMENTAL_SPF |
8523533c TK |
2937 | case ACLC_SPF: |
2938 | rc = spf_process(&arg, sender_address); | |
2939 | break; | |
71fafd95 | 2940 | #endif |
8523533c | 2941 | |
059ec3d9 PH |
2942 | /* If the verb is WARN, discard any user message from verification, because |
2943 | such messages are SMTP responses, not header additions. The latter come | |
475fe28a PH |
2944 | only from explicit "message" modifiers. However, put the user message into |
2945 | $acl_verify_message so it can be used in subsequent conditions or modifiers | |
2946 | (until something changes it). */ | |
059ec3d9 PH |
2947 | |
2948 | case ACLC_VERIFY: | |
2949 | rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno); | |
475fe28a | 2950 | acl_verify_message = *user_msgptr; |
059ec3d9 PH |
2951 | if (verb == ACL_WARN) *user_msgptr = NULL; |
2952 | break; | |
2953 | ||
2954 | default: | |
2955 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown " | |
2956 | "condition %d", cb->type); | |
2957 | break; | |
2958 | } | |
2959 | ||
2960 | /* If a condition was negated, invert OK/FAIL. */ | |
2961 | ||
2962 | if (!cond_modifiers[cb->type] && cb->u.negated) | |
2963 | { | |
2964 | if (rc == OK) rc = FAIL; | |
2965 | else if (rc == FAIL || rc == FAIL_DROP) rc = OK; | |
2966 | } | |
2967 | ||
2968 | if (rc != OK) break; /* Conditions loop */ | |
2969 | } | |
2970 | ||
2971 | ||
2972 | /* If the result is the one for which "message" and/or "log_message" are used, | |
2973 | handle the values of these options. Most verbs have but a single return for | |
2974 | which the messages are relevant, but for "discard", it's useful to have the log | |
2975 | message both when it succeeds and when it fails. Also, for an "accept" that | |
2976 | appears in a QUIT ACL, we want to handle the user message. Since only "accept" | |
2977 | and "warn" are permitted in that ACL, we don't need to test the verb. | |
2978 | ||
2979 | These modifiers act in different ways: | |
2980 | ||
2981 | "message" is a user message that will be included in an SMTP response. Unless | |
2982 | it is empty, it overrides any previously set user message. | |
2983 | ||
2984 | "log_message" is a non-user message, and it adds to any existing non-user | |
2985 | message that is already set. | |
2986 | ||
2987 | If there isn't a log message set, we make it the same as the user message. */ | |
2988 | ||
2989 | if (((rc == FAIL_DROP)? FAIL : rc) == msgcond[verb] || | |
2990 | (verb == ACL_DISCARD && rc == OK) || | |
2991 | (where == ACL_WHERE_QUIT)) | |
2992 | { | |
2993 | uschar *expmessage; | |
2994 | ||
2995 | /* If the verb is "warn", messages generated by conditions (verification or | |
2996 | nested ACLs) are discarded. Only messages specified at this level are used. | |
2997 | However, the value of an existing message is available in $acl_verify_message | |
2998 | during expansions. */ | |
2999 | ||
3000 | uschar *old_user_msgptr = *user_msgptr; | |
3001 | uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr; | |
3002 | ||
3003 | if (verb == ACL_WARN) *log_msgptr = *user_msgptr = NULL; | |
3004 | ||
3005 | if (user_message != NULL) | |
3006 | { | |
3007 | acl_verify_message = old_user_msgptr; | |
3008 | expmessage = expand_string(user_message); | |
3009 | if (expmessage == NULL) | |
3010 | { | |
3011 | if (!expand_string_forcedfail) | |
3012 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3013 | user_message, expand_string_message); | |
3014 | } | |
3015 | else if (expmessage[0] != 0) *user_msgptr = expmessage; | |
3016 | } | |
3017 | ||
3018 | if (log_message != NULL) | |
3019 | { | |
3020 | acl_verify_message = old_log_msgptr; | |
3021 | expmessage = expand_string(log_message); | |
3022 | if (expmessage == NULL) | |
3023 | { | |
3024 | if (!expand_string_forcedfail) | |
3025 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3026 | log_message, expand_string_message); | |
3027 | } | |
3028 | else if (expmessage[0] != 0) | |
3029 | { | |
3030 | *log_msgptr = (*log_msgptr == NULL)? expmessage : | |
3031 | string_sprintf("%s: %s", expmessage, *log_msgptr); | |
3032 | } | |
3033 | } | |
3034 | ||
3035 | /* If no log message, default it to the user message */ | |
3036 | ||
3037 | if (*log_msgptr == NULL) *log_msgptr = *user_msgptr; | |
3038 | } | |
3039 | ||
3040 | acl_verify_message = NULL; | |
3041 | return rc; | |
3042 | } | |
3043 | ||
3044 | ||
3045 | ||
3046 | ||
3047 | ||
3048 | /************************************************* | |
3049 | * Get line from a literal ACL * | |
3050 | *************************************************/ | |
3051 | ||
3052 | /* This function is passed to acl_read() in order to extract individual lines | |
3053 | of a literal ACL, which we access via static pointers. We can destroy the | |
3054 | contents because this is called only once (the compiled ACL is remembered). | |
3055 | ||
3056 | This code is intended to treat the data in the same way as lines in the main | |
3057 | Exim configuration file. That is: | |
3058 | ||
3059 | . Leading spaces are ignored. | |
3060 | ||
3061 | . A \ at the end of a line is a continuation - trailing spaces after the \ | |
3062 | are permitted (this is because I don't believe in making invisible things | |
3063 | significant). Leading spaces on the continued part of a line are ignored. | |
3064 | ||
3065 | . Physical lines starting (significantly) with # are totally ignored, and | |
3066 | may appear within a sequence of backslash-continued lines. | |
3067 | ||
3068 | . Blank lines are ignored, but will end a sequence of continuations. | |
3069 | ||
3070 | Arguments: none | |
3071 | Returns: a pointer to the next line | |
3072 | */ | |
3073 | ||
3074 | ||
3075 | static uschar *acl_text; /* Current pointer in the text */ | |
3076 | static uschar *acl_text_end; /* Points one past the terminating '0' */ | |
3077 | ||
3078 | ||
3079 | static uschar * | |
3080 | acl_getline(void) | |
3081 | { | |
3082 | uschar *yield; | |
3083 | ||
3084 | /* This loop handles leading blank lines and comments. */ | |
3085 | ||
3086 | for(;;) | |
3087 | { | |
3088 | while (isspace(*acl_text)) acl_text++; /* Leading spaces/empty lines */ | |
3089 | if (*acl_text == 0) return NULL; /* No more data */ | |
3090 | yield = acl_text; /* Potential data line */ | |
3091 | ||
3092 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3093 | ||
3094 | /* If we hit the end before a newline, we have the whole logical line. If | |
3095 | it's a comment, there's no more data to be given. Otherwise, yield it. */ | |
3096 | ||
3097 | if (*acl_text == 0) return (*yield == '#')? NULL : yield; | |
3098 | ||
3099 | /* After reaching a newline, end this loop if the physical line does not | |
3100 | start with '#'. If it does, it's a comment, and the loop continues. */ | |
3101 | ||
3102 | if (*yield != '#') break; | |
3103 | } | |
3104 | ||
3105 | /* This loop handles continuations. We know we have some real data, ending in | |
3106 | newline. See if there is a continuation marker at the end (ignoring trailing | |
3107 | white space). We know that *yield is not white space, so no need to test for | |
3108 | cont > yield in the backwards scanning loop. */ | |
3109 | ||
3110 | for(;;) | |
3111 | { | |
3112 | uschar *cont; | |
3113 | for (cont = acl_text - 1; isspace(*cont); cont--); | |
3114 | ||
3115 | /* If no continuation follows, we are done. Mark the end of the line and | |
3116 | return it. */ | |
3117 | ||
3118 | if (*cont != '\\') | |
3119 | { | |
3120 | *acl_text++ = 0; | |
3121 | return yield; | |
3122 | } | |
3123 | ||
3124 | /* We have encountered a continuation. Skip over whitespace at the start of | |
3125 | the next line, and indeed the whole of the next line or lines if they are | |
3126 | comment lines. */ | |
3127 | ||
3128 | for (;;) | |
3129 | { | |
3130 | while (*(++acl_text) == ' ' || *acl_text == '\t'); | |
3131 | if (*acl_text != '#') break; | |
3132 | while (*(++acl_text) != 0 && *acl_text != '\n'); | |
3133 | } | |
3134 | ||
3135 | /* We have the start of a continuation line. Move all the rest of the data | |
3136 | to join onto the previous line, and then find its end. If the end is not a | |
3137 | newline, we are done. Otherwise loop to look for another continuation. */ | |
3138 | ||
3139 | memmove(cont, acl_text, acl_text_end - acl_text); | |
3140 | acl_text_end -= acl_text - cont; | |
3141 | acl_text = cont; | |
3142 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3143 | if (*acl_text == 0) return yield; | |
3144 | } | |
3145 | ||
3146 | /* Control does not reach here */ | |
3147 | } | |
3148 | ||
3149 | ||
3150 | ||
3151 | ||
3152 | ||
3153 | /************************************************* | |
3154 | * Check access using an ACL * | |
3155 | *************************************************/ | |
3156 | ||
3157 | /* This function is called from address_check. It may recurse via | |
3158 | acl_check_condition() - hence the use of a level to stop looping. The ACL is | |
3159 | passed as a string which is expanded. A forced failure implies no access check | |
3160 | is required. If the result is a single word, it is taken as the name of an ACL | |
3161 | which is sought in the global ACL tree. Otherwise, it is taken as literal ACL | |
3162 | text, complete with newlines, and parsed as such. In both cases, the ACL check | |
3163 | is then run. This function uses an auxiliary function for acl_read() to call | |
3164 | for reading individual lines of a literal ACL. This is acl_getline(), which | |
3165 | appears immediately above. | |
3166 | ||
3167 | Arguments: | |
3168 | where where called from | |
3169 | addr address item when called from RCPT; otherwise NULL | |
3170 | s the input string; NULL is the same as an empty ACL => DENY | |
3171 | level the nesting level | |
3172 | user_msgptr where to put a user error (for SMTP response) | |
3173 | log_msgptr where to put a logging message (not for SMTP response) | |
3174 | ||
3175 | Returns: OK access is granted | |
3176 | DISCARD access is apparently granted... | |
3177 | FAIL access is denied | |
3178 | FAIL_DROP access is denied; drop the connection | |
3179 | DEFER can't tell at the moment | |
3180 | ERROR disaster | |
3181 | */ | |
3182 | ||
3183 | static int | |
3184 | acl_check_internal(int where, address_item *addr, uschar *s, int level, | |
3185 | uschar **user_msgptr, uschar **log_msgptr) | |
3186 | { | |
3187 | int fd = -1; | |
3188 | acl_block *acl = NULL; | |
3189 | uschar *acl_name = US"inline ACL"; | |
3190 | uschar *ss; | |
3191 | ||
3192 | /* Catch configuration loops */ | |
3193 | ||
3194 | if (level > 20) | |
3195 | { | |
3196 | *log_msgptr = US"ACL nested too deep: possible loop"; | |
3197 | return ERROR; | |
3198 | } | |
3199 | ||
3200 | if (s == NULL) | |
3201 | { | |
3202 | HDEBUG(D_acl) debug_printf("ACL is NULL: implicit DENY\n"); | |
3203 | return FAIL; | |
3204 | } | |
3205 | ||
3206 | /* At top level, we expand the incoming string. At lower levels, it has already | |
3207 | been expanded as part of condition processing. */ | |
3208 | ||
3209 | if (level == 0) | |
3210 | { | |
3211 | ss = expand_string(s); | |
3212 | if (ss == NULL) | |
3213 | { | |
3214 | if (expand_string_forcedfail) return OK; | |
3215 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s, | |
3216 | expand_string_message); | |
3217 | return ERROR; | |
3218 | } | |
3219 | } | |
3220 | else ss = s; | |
3221 | ||
3222 | while (isspace(*ss))ss++; | |
3223 | ||
3224 | /* If we can't find a named ACL, the default is to parse it as an inline one. | |
3225 | (Unless it begins with a slash; non-existent files give rise to an error.) */ | |
3226 | ||
3227 | acl_text = ss; | |
3228 | ||
3229 | /* Handle the case of a string that does not contain any spaces. Look for a | |
3230 | named ACL among those read from the configuration, or a previously read file. | |
3231 | It is possible that the pointer to the ACL is NULL if the configuration | |
3232 | contains a name with no data. If not found, and the text begins with '/', | |
3233 | read an ACL from a file, and save it so it can be re-used. */ | |
3234 | ||
3235 | if (Ustrchr(ss, ' ') == NULL) | |
3236 | { | |
3237 | tree_node *t = tree_search(acl_anchor, ss); | |
3238 | if (t != NULL) | |
3239 | { | |
3240 | acl = (acl_block *)(t->data.ptr); | |
3241 | if (acl == NULL) | |
3242 | { | |
3243 | HDEBUG(D_acl) debug_printf("ACL \"%s\" is empty: implicit DENY\n", ss); | |
3244 | return FAIL; | |
3245 | } | |
3246 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
3247 | HDEBUG(D_acl) debug_printf("using ACL \"%s\"\n", ss); | |
3248 | } | |
3249 | ||
3250 | else if (*ss == '/') | |
3251 | { | |
3252 | struct stat statbuf; | |
3253 | fd = Uopen(ss, O_RDONLY, 0); | |
3254 | if (fd < 0) | |
3255 | { | |
3256 | *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss, | |
3257 | strerror(errno)); | |
3258 | return ERROR; | |
3259 | } | |
3260 | ||
3261 | if (fstat(fd, &statbuf) != 0) | |
3262 | { | |
3263 | *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss, | |
3264 | strerror(errno)); | |
3265 | return ERROR; | |
3266 | } | |
3267 | ||
3268 | acl_text = store_get(statbuf.st_size + 1); | |
3269 | acl_text_end = acl_text + statbuf.st_size + 1; | |
3270 | ||
3271 | if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size) | |
3272 | { | |
3273 | *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s", | |
3274 | ss, strerror(errno)); | |
3275 | return ERROR; | |
3276 | } | |
3277 | acl_text[statbuf.st_size] = 0; | |
f1e894f3 | 3278 | (void)close(fd); |
059ec3d9 PH |
3279 | |
3280 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
3281 | HDEBUG(D_acl) debug_printf("read ACL from file %s\n", ss); | |
3282 | } | |
3283 | } | |
3284 | ||
3285 | /* Parse an ACL that is still in text form. If it came from a file, remember it | |
3286 | in the ACL tree, having read it into the POOL_PERM store pool so that it | |
3287 | persists between multiple messages. */ | |
3288 | ||
3289 | if (acl == NULL) | |
3290 | { | |
3291 | int old_pool = store_pool; | |
3292 | if (fd >= 0) store_pool = POOL_PERM; | |
3293 | acl = acl_read(acl_getline, log_msgptr); | |
3294 | store_pool = old_pool; | |
3295 | if (acl == NULL && *log_msgptr != NULL) return ERROR; | |
3296 | if (fd >= 0) | |
3297 | { | |
3298 | tree_node *t = store_get_perm(sizeof(tree_node) + Ustrlen(ss)); | |
3299 | Ustrcpy(t->name, ss); | |
3300 | t->data.ptr = acl; | |
3301 | (void)tree_insertnode(&acl_anchor, t); | |
3302 | } | |
3303 | } | |
3304 | ||
3305 | /* Now we have an ACL to use. It's possible it may be NULL. */ | |
3306 | ||
3307 | while (acl != NULL) | |
3308 | { | |
3309 | int cond; | |
3310 | int basic_errno = 0; | |
3311 | BOOL endpass_seen = FALSE; | |
3312 | ||
3313 | *log_msgptr = *user_msgptr = NULL; | |
3314 | acl_temp_details = FALSE; | |
3315 | ||
3316 | if (where == ACL_WHERE_QUIT && | |
3317 | acl->verb != ACL_ACCEPT && | |
3318 | acl->verb != ACL_WARN) | |
3319 | { | |
3320 | *log_msgptr = string_sprintf("\"%s\" is not allowed in a QUIT ACL", | |
3321 | verbs[acl->verb]); | |
3322 | return ERROR; | |
3323 | } | |
3324 | ||
3325 | HDEBUG(D_acl) debug_printf("processing \"%s\"\n", verbs[acl->verb]); | |
3326 | ||
3327 | /* Clear out any search error message from a previous check before testing | |
3328 | this condition. */ | |
3329 | ||
3330 | search_error_message = NULL; | |
3331 | cond = acl_check_condition(acl->verb, acl->condition, where, addr, level, | |
3332 | &endpass_seen, user_msgptr, log_msgptr, &basic_errno); | |
3333 | ||
3334 | /* Handle special returns: DEFER causes a return except on a WARN verb; | |
3335 | ERROR always causes a return. */ | |
3336 | ||
3337 | switch (cond) | |
3338 | { | |
3339 | case DEFER: | |
3340 | HDEBUG(D_acl) debug_printf("%s: condition test deferred\n", verbs[acl->verb]); | |
3341 | if (basic_errno != ERRNO_CALLOUTDEFER) | |
3342 | { | |
3343 | if (search_error_message != NULL && *search_error_message != 0) | |
3344 | *log_msgptr = search_error_message; | |
3345 | if (smtp_return_error_details) acl_temp_details = TRUE; | |
3346 | } | |
3347 | else | |
3348 | { | |
3349 | acl_temp_details = TRUE; | |
3350 | } | |
3351 | if (acl->verb != ACL_WARN) return DEFER; | |
3352 | break; | |
3353 | ||
3354 | default: /* Paranoia */ | |
3355 | case ERROR: | |
3356 | HDEBUG(D_acl) debug_printf("%s: condition test error\n", verbs[acl->verb]); | |
3357 | return ERROR; | |
3358 | ||
3359 | case OK: | |
3360 | HDEBUG(D_acl) debug_printf("%s: condition test succeeded\n", | |
3361 | verbs[acl->verb]); | |
3362 | break; | |
3363 | ||
3364 | case FAIL: | |
3365 | HDEBUG(D_acl) debug_printf("%s: condition test failed\n", verbs[acl->verb]); | |
3366 | break; | |
3367 | ||
3368 | /* DISCARD and DROP can happen only from a nested ACL condition, and | |
3369 | DISCARD can happen only for an "accept" or "discard" verb. */ | |
3370 | ||
3371 | case DISCARD: | |
3372 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"discard\"\n", | |
3373 | verbs[acl->verb]); | |
3374 | break; | |
3375 | ||
3376 | case FAIL_DROP: | |
3377 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"drop\"\n", | |
3378 | verbs[acl->verb]); | |
3379 | break; | |
3380 | } | |
3381 | ||
3382 | /* At this point, cond for most verbs is either OK or FAIL or (as a result of | |
3383 | a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and | |
3384 | for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */ | |
3385 | ||
3386 | switch(acl->verb) | |
3387 | { | |
3388 | case ACL_ACCEPT: | |
3389 | if (cond == OK || cond == DISCARD) return cond; | |
3390 | if (endpass_seen) | |
3391 | { | |
3392 | HDEBUG(D_acl) debug_printf("accept: endpass encountered - denying access\n"); | |
3393 | return cond; | |
3394 | } | |
3395 | break; | |
3396 | ||
3397 | case ACL_DEFER: | |
3398 | if (cond == OK) | |
3399 | { | |
3400 | acl_temp_details = TRUE; | |
3401 | return DEFER; | |
3402 | } | |
3403 | break; | |
3404 | ||
3405 | case ACL_DENY: | |
3406 | if (cond == OK) return FAIL; | |
3407 | break; | |
3408 | ||
3409 | case ACL_DISCARD: | |
3410 | if (cond == OK || cond == DISCARD) return DISCARD; | |
3411 | if (endpass_seen) | |
3412 | { | |
3413 | HDEBUG(D_acl) debug_printf("discard: endpass encountered - denying access\n"); | |
3414 | return cond; | |
3415 | } | |
3416 | break; | |
3417 | ||
3418 | case ACL_DROP: | |
3419 | if (cond == OK) return FAIL_DROP; | |
3420 | break; | |
3421 | ||
3422 | case ACL_REQUIRE: | |
3423 | if (cond != OK) return cond; | |
3424 | break; | |
3425 | ||
3426 | case ACL_WARN: | |
3427 | if (cond == OK) | |
3428 | acl_warn(where, *user_msgptr, *log_msgptr); | |
49826d12 | 3429 | else if (cond == DEFER && (log_extra_selector & LX_acl_warn_skipped) != 0) |
9c7a242c PH |
3430 | log_write(0, LOG_MAIN, "%s Warning: ACL \"warn\" statement skipped: " |
3431 | "condition test deferred%s%s", host_and_ident(TRUE), | |
3432 | (*log_msgptr == NULL)? US"" : US": ", | |
3433 | (*log_msgptr == NULL)? US"" : *log_msgptr); | |
059ec3d9 PH |
3434 | *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */ |
3435 | break; | |
3436 | ||
3437 | default: | |
3438 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d", | |
3439 | acl->verb); | |
3440 | break; | |
3441 | } | |
3442 | ||
3443 | /* Pass to the next ACL item */ | |
3444 | ||
3445 | acl = acl->next; | |
3446 | } | |
3447 | ||
3448 | /* We have reached the end of the ACL. This is an implicit DENY. */ | |
3449 | ||
3450 | HDEBUG(D_acl) debug_printf("end of %s: implicit DENY\n", acl_name); | |
3451 | return FAIL; | |
3452 | } | |
3453 | ||
3454 | ||
3455 | /************************************************* | |
3456 | * Check access using an ACL * | |
3457 | *************************************************/ | |
3458 | ||
3459 | /* This is the external interface for ACL checks. It sets up an address and the | |
3460 | expansions for $domain and $local_part when called after RCPT, then calls | |
3461 | acl_check_internal() to do the actual work. | |
3462 | ||
3463 | Arguments: | |
3464 | where ACL_WHERE_xxxx indicating where called from | |
64ffc24f | 3465 | recipient RCPT address for RCPT check, else NULL |
059ec3d9 PH |
3466 | s the input string; NULL is the same as an empty ACL => DENY |
3467 | user_msgptr where to put a user error (for SMTP response) | |
3468 | log_msgptr where to put a logging message (not for SMTP response) | |
3469 | ||
3470 | Returns: OK access is granted by an ACCEPT verb | |
3471 | DISCARD access is granted by a DISCARD verb | |
3472 | FAIL access is denied | |
3473 | FAIL_DROP access is denied; drop the connection | |
3474 | DEFER can't tell at the moment | |
3475 | ERROR disaster | |
3476 | */ | |
3477 | ||
3478 | int | |
64ffc24f | 3479 | acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr, |
059ec3d9 PH |
3480 | uschar **log_msgptr) |
3481 | { | |
3482 | int rc; | |
3483 | address_item adb; | |
64ffc24f | 3484 | address_item *addr = NULL; |
059ec3d9 PH |
3485 | |
3486 | *user_msgptr = *log_msgptr = NULL; | |
3487 | sender_verified_failed = NULL; | |
fe0dab11 | 3488 | ratelimiters_cmd = NULL; |
059ec3d9 PH |
3489 | |
3490 | if (where == ACL_WHERE_RCPT) | |
3491 | { | |
3492 | adb = address_defaults; | |
3493 | addr = &adb; | |
64ffc24f | 3494 | addr->address = recipient; |
059ec3d9 PH |
3495 | if (deliver_split_address(addr) == DEFER) |
3496 | { | |
3497 | *log_msgptr = US"defer in percent_hack_domains check"; | |
3498 | return DEFER; | |
3499 | } | |
3500 | deliver_domain = addr->domain; | |
3501 | deliver_localpart = addr->local_part; | |
3502 | } | |
059ec3d9 PH |
3503 | |
3504 | rc = acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr); | |
3505 | ||
64ffc24f PH |
3506 | deliver_domain = deliver_localpart = deliver_address_data = |
3507 | sender_address_data = NULL; | |
059ec3d9 PH |
3508 | |
3509 | /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA | |
3510 | ACL, which is really in the middle of an SMTP command. */ | |
3511 | ||
3512 | if (rc == DISCARD) | |
3513 | { | |
3514 | if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA) | |
3515 | { | |
3516 | log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s " | |
3517 | "ACL", acl_wherenames[where]); | |
3518 | return ERROR; | |
3519 | } | |
3520 | return DISCARD; | |
3521 | } | |
3522 | ||
3523 | /* A DROP response is not permitted from MAILAUTH */ | |
3524 | ||
3525 | if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH) | |
3526 | { | |
3527 | log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s " | |
3528 | "ACL", acl_wherenames[where]); | |
3529 | return ERROR; | |
3530 | } | |
3531 | ||
3532 | /* Before giving an error response, take a look at the length of any user | |
3533 | message, and split it up into multiple lines if possible. */ | |
3534 | ||
3535 | if (rc != OK && *user_msgptr != NULL && Ustrlen(*user_msgptr) > 75) | |
3536 | { | |
3537 | uschar *s = *user_msgptr = string_copy(*user_msgptr); | |
3538 | uschar *ss = s; | |
3539 | ||
3540 | for (;;) | |
3541 | { | |
3542 | int i = 0; | |
3543 | while (i < 75 && *ss != 0 && *ss != '\n') ss++, i++; | |
3544 | if (*ss == 0) break; | |
3545 | if (*ss == '\n') | |
3546 | s = ++ss; | |
3547 | else | |
3548 | { | |
3549 | uschar *t = ss + 1; | |
3550 | uschar *tt = NULL; | |
3551 | while (--t > s + 35) | |
3552 | { | |
3553 | if (*t == ' ') | |
3554 | { | |
3555 | if (t[-1] == ':') { tt = t; break; } | |
3556 | if (tt == NULL) tt = t; | |
3557 | } | |
3558 | } | |
3559 | ||
3560 | if (tt == NULL) /* Can't split behind - try ahead */ | |
3561 | { | |
3562 | t = ss + 1; | |
3563 | while (*t != 0) | |
3564 | { | |
3565 | if (*t == ' ' || *t == '\n') | |
3566 | { tt = t; break; } | |
3567 | t++; | |
3568 | } | |
3569 | } | |
3570 | ||
3571 | if (tt == NULL) break; /* Can't find anywhere to split */ | |
3572 | *tt = '\n'; | |
3573 | s = ss = tt+1; | |
3574 | } | |
3575 | } | |
3576 | } | |
3577 | ||
3578 | return rc; | |
3579 | } | |
3580 | ||
3581 | /* End of acl.c */ |