Commit | Line | Data |
---|---|---|
059ec3d9 PH |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
80fea873 | 5 | /* Copyright (c) University of Cambridge 1995 - 2016 */ |
059ec3d9 PH |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | /* Code for handling Access Control Lists (ACLs) */ | |
9 | ||
10 | #include "exim.h" | |
11 | ||
12 | ||
13 | /* Default callout timeout */ | |
14 | ||
15 | #define CALLOUT_TIMEOUT_DEFAULT 30 | |
16 | ||
17 | /* ACL verb codes - keep in step with the table of verbs that follows */ | |
18 | ||
19 | enum { ACL_ACCEPT, ACL_DEFER, ACL_DENY, ACL_DISCARD, ACL_DROP, ACL_REQUIRE, | |
20 | ACL_WARN }; | |
21 | ||
22 | /* ACL verbs */ | |
23 | ||
f9d04f08 JH |
24 | static uschar *verbs[] = { |
25 | US"accept", | |
26 | US"defer", | |
27 | US"deny", | |
28 | US"discard", | |
29 | US"drop", | |
30 | US"require", | |
059ec3d9 PH |
31 | US"warn" }; |
32 | ||
4e88a19f PH |
33 | /* For each verb, the conditions for which "message" or "log_message" are used |
34 | are held as a bitmap. This is to avoid expanding the strings unnecessarily. For | |
35 | "accept", the FAIL case is used only after "endpass", but that is selected in | |
36 | the code. */ | |
37 | ||
38 | static int msgcond[] = { | |
39 | (1<<OK) | (1<<FAIL) | (1<<FAIL_DROP), /* accept */ | |
40 | (1<<OK), /* defer */ | |
41 | (1<<OK), /* deny */ | |
42 | (1<<OK) | (1<<FAIL) | (1<<FAIL_DROP), /* discard */ | |
43 | (1<<OK), /* drop */ | |
44 | (1<<FAIL) | (1<<FAIL_DROP), /* require */ | |
45 | (1<<OK) /* warn */ | |
46 | }; | |
059ec3d9 PH |
47 | |
48 | /* ACL condition and modifier codes - keep in step with the table that | |
71fafd95 PH |
49 | follows, and the cond_expand_at_top and uschar cond_modifiers tables lower |
50 | down. */ | |
059ec3d9 | 51 | |
71fafd95 PH |
52 | enum { ACLC_ACL, |
53 | ACLC_ADD_HEADER, | |
54 | ACLC_AUTHENTICATED, | |
8523533c TK |
55 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
56 | ACLC_BMI_OPTIN, | |
57 | #endif | |
71fafd95 | 58 | ACLC_CONDITION, |
c3611384 | 59 | ACLC_CONTINUE, |
71fafd95 | 60 | ACLC_CONTROL, |
6a8f9482 TK |
61 | #ifdef EXPERIMENTAL_DCC |
62 | ACLC_DCC, | |
63 | #endif | |
8523533c TK |
64 | #ifdef WITH_CONTENT_SCAN |
65 | ACLC_DECODE, | |
66 | #endif | |
67 | ACLC_DELAY, | |
80a47a2c TK |
68 | #ifndef DISABLE_DKIM |
69 | ACLC_DKIM_SIGNER, | |
70 | ACLC_DKIM_STATUS, | |
4840604e TL |
71 | #endif |
72 | #ifdef EXPERIMENTAL_DMARC | |
73 | ACLC_DMARC_STATUS, | |
8e669ac1 | 74 | #endif |
71fafd95 PH |
75 | ACLC_DNSLISTS, |
76 | ACLC_DOMAINS, | |
77 | ACLC_ENCRYPTED, | |
78 | ACLC_ENDPASS, | |
79 | ACLC_HOSTS, | |
80 | ACLC_LOCAL_PARTS, | |
81 | ACLC_LOG_MESSAGE, | |
6ea85e9a | 82 | ACLC_LOG_REJECT_TARGET, |
71fafd95 | 83 | ACLC_LOGWRITE, |
8523533c TK |
84 | #ifdef WITH_CONTENT_SCAN |
85 | ACLC_MALWARE, | |
86 | #endif | |
87 | ACLC_MESSAGE, | |
88 | #ifdef WITH_CONTENT_SCAN | |
89 | ACLC_MIME_REGEX, | |
90 | #endif | |
b0b9dbb1 | 91 | ACLC_QUEUE, |
870f6ba8 | 92 | ACLC_RATELIMIT, |
8523533c TK |
93 | ACLC_RECIPIENTS, |
94 | #ifdef WITH_CONTENT_SCAN | |
95 | ACLC_REGEX, | |
96 | #endif | |
e7568d51 | 97 | ACLC_REMOVE_HEADER, |
71fafd95 PH |
98 | ACLC_SENDER_DOMAINS, |
99 | ACLC_SENDERS, | |
100 | ACLC_SET, | |
8523533c | 101 | #ifdef WITH_CONTENT_SCAN |
8e669ac1 | 102 | ACLC_SPAM, |
8523533c TK |
103 | #endif |
104 | #ifdef EXPERIMENTAL_SPF | |
105 | ACLC_SPF, | |
65a7d8c3 | 106 | ACLC_SPF_GUESS, |
8523533c | 107 | #endif |
b0019c78 | 108 | ACLC_UDPSEND, |
8523533c | 109 | ACLC_VERIFY }; |
059ec3d9 | 110 | |
c3611384 | 111 | /* ACL conditions/modifiers: "delay", "control", "continue", "endpass", |
b0b9dbb1 | 112 | "message", "log_message", "log_reject_target", "logwrite", "queue" and "set" are |
c3611384 PH |
113 | modifiers that look like conditions but always return TRUE. They are used for |
114 | their side effects. */ | |
059ec3d9 | 115 | |
9a26b6b2 PH |
116 | static uschar *conditions[] = { |
117 | US"acl", | |
71fafd95 | 118 | US"add_header", |
9a26b6b2 | 119 | US"authenticated", |
8523533c TK |
120 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
121 | US"bmi_optin", | |
122 | #endif | |
123 | US"condition", | |
c3611384 | 124 | US"continue", |
8e669ac1 | 125 | US"control", |
6a8f9482 TK |
126 | #ifdef EXPERIMENTAL_DCC |
127 | US"dcc", | |
128 | #endif | |
8523533c TK |
129 | #ifdef WITH_CONTENT_SCAN |
130 | US"decode", | |
131 | #endif | |
132 | US"delay", | |
80a47a2c TK |
133 | #ifndef DISABLE_DKIM |
134 | US"dkim_signers", | |
135 | US"dkim_status", | |
4840604e TL |
136 | #endif |
137 | #ifdef EXPERIMENTAL_DMARC | |
138 | US"dmarc_status", | |
8523533c | 139 | #endif |
6ea85e9a PH |
140 | US"dnslists", |
141 | US"domains", | |
142 | US"encrypted", | |
143 | US"endpass", | |
144 | US"hosts", | |
145 | US"local_parts", | |
146 | US"log_message", | |
147 | US"log_reject_target", | |
148 | US"logwrite", | |
8523533c TK |
149 | #ifdef WITH_CONTENT_SCAN |
150 | US"malware", | |
151 | #endif | |
152 | US"message", | |
153 | #ifdef WITH_CONTENT_SCAN | |
154 | US"mime_regex", | |
155 | #endif | |
b0b9dbb1 | 156 | US"queue", |
870f6ba8 | 157 | US"ratelimit", |
8523533c TK |
158 | US"recipients", |
159 | #ifdef WITH_CONTENT_SCAN | |
160 | US"regex", | |
161 | #endif | |
e7568d51 | 162 | US"remove_header", |
b0b9dbb1 JH |
163 | US"sender_domains", |
164 | US"senders", | |
165 | US"set", | |
8523533c TK |
166 | #ifdef WITH_CONTENT_SCAN |
167 | US"spam", | |
168 | #endif | |
169 | #ifdef EXPERIMENTAL_SPF | |
170 | US"spf", | |
65a7d8c3 | 171 | US"spf_guess", |
8523533c | 172 | #endif |
b0019c78 | 173 | US"udpsend", |
059ec3d9 | 174 | US"verify" }; |
8e669ac1 | 175 | |
c5fcb476 | 176 | |
047bdd8c | 177 | /* Flags to indicate for which conditions/modifiers a string expansion is done |
059ec3d9 PH |
178 | at the outer level. In the other cases, expansion already occurs in the |
179 | checking functions. */ | |
180 | ||
181 | static uschar cond_expand_at_top[] = { | |
7421ecab | 182 | FALSE, /* acl */ |
3e536984 | 183 | TRUE, /* add_header */ |
059ec3d9 | 184 | FALSE, /* authenticated */ |
8523533c TK |
185 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
186 | TRUE, /* bmi_optin */ | |
8e669ac1 | 187 | #endif |
059ec3d9 | 188 | TRUE, /* condition */ |
c3611384 | 189 | TRUE, /* continue */ |
059ec3d9 | 190 | TRUE, /* control */ |
6a8f9482 TK |
191 | #ifdef EXPERIMENTAL_DCC |
192 | TRUE, /* dcc */ | |
193 | #endif | |
8523533c TK |
194 | #ifdef WITH_CONTENT_SCAN |
195 | TRUE, /* decode */ | |
196 | #endif | |
059ec3d9 | 197 | TRUE, /* delay */ |
80a47a2c TK |
198 | #ifndef DISABLE_DKIM |
199 | TRUE, /* dkim_signers */ | |
200 | TRUE, /* dkim_status */ | |
4840604e TL |
201 | #endif |
202 | #ifdef EXPERIMENTAL_DMARC | |
203 | TRUE, /* dmarc_status */ | |
8523533c | 204 | #endif |
059ec3d9 PH |
205 | TRUE, /* dnslists */ |
206 | FALSE, /* domains */ | |
207 | FALSE, /* encrypted */ | |
208 | TRUE, /* endpass */ | |
209 | FALSE, /* hosts */ | |
210 | FALSE, /* local_parts */ | |
211 | TRUE, /* log_message */ | |
6ea85e9a | 212 | TRUE, /* log_reject_target */ |
059ec3d9 | 213 | TRUE, /* logwrite */ |
8523533c TK |
214 | #ifdef WITH_CONTENT_SCAN |
215 | TRUE, /* malware */ | |
216 | #endif | |
059ec3d9 | 217 | TRUE, /* message */ |
8523533c TK |
218 | #ifdef WITH_CONTENT_SCAN |
219 | TRUE, /* mime_regex */ | |
220 | #endif | |
b0b9dbb1 | 221 | TRUE, /* queue */ |
870f6ba8 | 222 | TRUE, /* ratelimit */ |
059ec3d9 | 223 | FALSE, /* recipients */ |
8523533c TK |
224 | #ifdef WITH_CONTENT_SCAN |
225 | TRUE, /* regex */ | |
226 | #endif | |
e7568d51 | 227 | TRUE, /* remove_header */ |
059ec3d9 PH |
228 | FALSE, /* sender_domains */ |
229 | FALSE, /* senders */ | |
230 | TRUE, /* set */ | |
8523533c TK |
231 | #ifdef WITH_CONTENT_SCAN |
232 | TRUE, /* spam */ | |
233 | #endif | |
234 | #ifdef EXPERIMENTAL_SPF | |
235 | TRUE, /* spf */ | |
65a7d8c3 | 236 | TRUE, /* spf_guess */ |
8523533c | 237 | #endif |
b0019c78 | 238 | TRUE, /* udpsend */ |
059ec3d9 PH |
239 | TRUE /* verify */ |
240 | }; | |
241 | ||
242 | /* Flags to identify the modifiers */ | |
243 | ||
244 | static uschar cond_modifiers[] = { | |
245 | FALSE, /* acl */ | |
3e536984 | 246 | TRUE, /* add_header */ |
059ec3d9 | 247 | FALSE, /* authenticated */ |
8523533c TK |
248 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
249 | TRUE, /* bmi_optin */ | |
8e669ac1 | 250 | #endif |
059ec3d9 | 251 | FALSE, /* condition */ |
c3611384 | 252 | TRUE, /* continue */ |
059ec3d9 | 253 | TRUE, /* control */ |
6a8f9482 TK |
254 | #ifdef EXPERIMENTAL_DCC |
255 | FALSE, /* dcc */ | |
256 | #endif | |
8523533c TK |
257 | #ifdef WITH_CONTENT_SCAN |
258 | FALSE, /* decode */ | |
259 | #endif | |
059ec3d9 | 260 | TRUE, /* delay */ |
80a47a2c TK |
261 | #ifndef DISABLE_DKIM |
262 | FALSE, /* dkim_signers */ | |
263 | FALSE, /* dkim_status */ | |
4840604e TL |
264 | #endif |
265 | #ifdef EXPERIMENTAL_DMARC | |
266 | FALSE, /* dmarc_status */ | |
8523533c | 267 | #endif |
059ec3d9 PH |
268 | FALSE, /* dnslists */ |
269 | FALSE, /* domains */ | |
270 | FALSE, /* encrypted */ | |
271 | TRUE, /* endpass */ | |
272 | FALSE, /* hosts */ | |
273 | FALSE, /* local_parts */ | |
274 | TRUE, /* log_message */ | |
6ea85e9a | 275 | TRUE, /* log_reject_target */ |
8523533c TK |
276 | TRUE, /* logwrite */ |
277 | #ifdef WITH_CONTENT_SCAN | |
278 | FALSE, /* malware */ | |
279 | #endif | |
059ec3d9 | 280 | TRUE, /* message */ |
8523533c TK |
281 | #ifdef WITH_CONTENT_SCAN |
282 | FALSE, /* mime_regex */ | |
283 | #endif | |
b0b9dbb1 | 284 | TRUE, /* queue */ |
870f6ba8 | 285 | FALSE, /* ratelimit */ |
059ec3d9 | 286 | FALSE, /* recipients */ |
8523533c TK |
287 | #ifdef WITH_CONTENT_SCAN |
288 | FALSE, /* regex */ | |
289 | #endif | |
e7568d51 | 290 | TRUE, /* remove_header */ |
059ec3d9 PH |
291 | FALSE, /* sender_domains */ |
292 | FALSE, /* senders */ | |
293 | TRUE, /* set */ | |
8523533c TK |
294 | #ifdef WITH_CONTENT_SCAN |
295 | FALSE, /* spam */ | |
296 | #endif | |
297 | #ifdef EXPERIMENTAL_SPF | |
298 | FALSE, /* spf */ | |
65a7d8c3 | 299 | FALSE, /* spf_guess */ |
8523533c | 300 | #endif |
b0019c78 | 301 | TRUE, /* udpsend */ |
059ec3d9 PH |
302 | FALSE /* verify */ |
303 | }; | |
304 | ||
c3611384 | 305 | /* Bit map vector of which conditions and modifiers are not allowed at certain |
8f128379 PH |
306 | times. For each condition and modifier, there's a bitmap of dis-allowed times. |
307 | For some, it is easier to specify the negation of a small number of allowed | |
308 | times. */ | |
059ec3d9 PH |
309 | |
310 | static unsigned int cond_forbids[] = { | |
311 | 0, /* acl */ | |
8e669ac1 | 312 | |
71fafd95 | 313 | (unsigned int) |
45b91596 | 314 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* add_header */ |
71fafd95 | 315 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| |
8ccd00b1 | 316 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
317 | (1<<ACL_WHERE_PRDR)| |
318 | #endif | |
45b91596 | 319 | (1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)| |
67caae1f | 320 | (1<<ACL_WHERE_DKIM)| |
45b91596 | 321 | (1<<ACL_WHERE_NOTSMTP_START)), |
71fafd95 | 322 | |
45b91596 PH |
323 | (1<<ACL_WHERE_NOTSMTP)| /* authenticated */ |
324 | (1<<ACL_WHERE_NOTSMTP_START)| | |
325 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO), | |
8e669ac1 | 326 | |
71fafd95 | 327 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
3864bb8e | 328 | (1<<ACL_WHERE_AUTH)| /* bmi_optin */ |
8523533c TK |
329 | (1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)| |
330 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_MIME)| | |
8ccd00b1 | 331 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
332 | (1<<ACL_WHERE_PRDR)| |
333 | #endif | |
8e669ac1 | 334 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| |
8523533c TK |
335 | (1<<ACL_WHERE_MAILAUTH)| |
336 | (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_STARTTLS)| | |
45b91596 PH |
337 | (1<<ACL_WHERE_VRFY)|(1<<ACL_WHERE_PREDATA)| |
338 | (1<<ACL_WHERE_NOTSMTP_START), | |
71fafd95 | 339 | #endif |
8e669ac1 | 340 | |
059ec3d9 | 341 | 0, /* condition */ |
8e669ac1 | 342 | |
c3611384 PH |
343 | 0, /* continue */ |
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 | |
6a8f9482 TK |
350 | #ifdef EXPERIMENTAL_DCC |
351 | (unsigned int) | |
fd98a5c6 | 352 | ~((1<<ACL_WHERE_DATA)| /* dcc */ |
8ccd00b1 | 353 | #ifndef DISABLE_PRDR |
fd98a5c6 | 354 | (1<<ACL_WHERE_PRDR)| |
8ccd00b1 | 355 | #endif |
fd98a5c6 | 356 | (1<<ACL_WHERE_NOTSMTP)), |
6a8f9482 TK |
357 | #endif |
358 | ||
71fafd95 | 359 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
360 | (unsigned int) |
361 | ~(1<<ACL_WHERE_MIME), /* decode */ | |
71fafd95 | 362 | #endif |
8523533c | 363 | |
8f128379 | 364 | (1<<ACL_WHERE_NOTQUIT), /* delay */ |
8e669ac1 | 365 | |
80a47a2c TK |
366 | #ifndef DISABLE_DKIM |
367 | (unsigned int) | |
368 | ~(1<<ACL_WHERE_DKIM), /* dkim_signers */ | |
84330b7b | 369 | |
80a47a2c TK |
370 | (unsigned int) |
371 | ~(1<<ACL_WHERE_DKIM), /* dkim_status */ | |
71fafd95 | 372 | #endif |
fb2274d4 | 373 | |
4840604e TL |
374 | #ifdef EXPERIMENTAL_DMARC |
375 | (unsigned int) | |
376 | ~(1<<ACL_WHERE_DATA), /* dmarc_status */ | |
377 | #endif | |
378 | ||
379ba7d0 JH |
379 | /* Explicit key lookups can be made in non-smtp ACLs so pass |
380 | always and check in the verify processing itself. */ | |
381 | ||
382 | 0, /* dnslists */ | |
059ec3d9 | 383 | |
2f079f46 | 384 | (unsigned int) |
fd98a5c6 | 385 | ~((1<<ACL_WHERE_RCPT) /* domains */ |
4f6ae5c3 | 386 | |(1<<ACL_WHERE_VRFY) |
8ccd00b1 | 387 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
388 | |(1<<ACL_WHERE_PRDR) |
389 | #endif | |
390 | ), | |
059ec3d9 | 391 | |
45b91596 PH |
392 | (1<<ACL_WHERE_NOTSMTP)| /* encrypted */ |
393 | (1<<ACL_WHERE_CONNECT)| | |
394 | (1<<ACL_WHERE_NOTSMTP_START)| | |
059ec3d9 | 395 | (1<<ACL_WHERE_HELO), |
8e669ac1 | 396 | |
059ec3d9 | 397 | 0, /* endpass */ |
8e669ac1 | 398 | |
45b91596 PH |
399 | (1<<ACL_WHERE_NOTSMTP)| /* hosts */ |
400 | (1<<ACL_WHERE_NOTSMTP_START), | |
059ec3d9 | 401 | |
2f079f46 | 402 | (unsigned int) |
fd98a5c6 | 403 | ~((1<<ACL_WHERE_RCPT) /* local_parts */ |
4f6ae5c3 | 404 | |(1<<ACL_WHERE_VRFY) |
2e6afa4f | 405 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
406 | |(1<<ACL_WHERE_PRDR) |
407 | #endif | |
408 | ), | |
059ec3d9 PH |
409 | |
410 | 0, /* log_message */ | |
8e669ac1 | 411 | |
6ea85e9a PH |
412 | 0, /* log_reject_target */ |
413 | ||
059ec3d9 | 414 | 0, /* logwrite */ |
8e669ac1 | 415 | |
71fafd95 | 416 | #ifdef WITH_CONTENT_SCAN |
2f079f46 | 417 | (unsigned int) |
fd98a5c6 | 418 | ~((1<<ACL_WHERE_DATA)| /* malware */ |
8ccd00b1 | 419 | #ifndef DISABLE_PRDR |
fd98a5c6 | 420 | (1<<ACL_WHERE_PRDR)| |
8ccd00b1 | 421 | #endif |
fd98a5c6 | 422 | (1<<ACL_WHERE_NOTSMTP)), |
71fafd95 | 423 | #endif |
8523533c | 424 | |
059ec3d9 PH |
425 | 0, /* message */ |
426 | ||
71fafd95 | 427 | #ifdef WITH_CONTENT_SCAN |
2f079f46 PH |
428 | (unsigned int) |
429 | ~(1<<ACL_WHERE_MIME), /* mime_regex */ | |
71fafd95 | 430 | #endif |
8523533c | 431 | |
ecc5f51a JH |
432 | (1<<ACL_WHERE_NOTSMTP)| /* queue */ |
433 | #ifndef DISABLE_PRDR | |
434 | (1<<ACL_WHERE_PRDR)| | |
435 | #endif | |
436 | (1<<ACL_WHERE_DATA), | |
437 | ||
870f6ba8 TF |
438 | 0, /* ratelimit */ |
439 | ||
2f079f46 PH |
440 | (unsigned int) |
441 | ~(1<<ACL_WHERE_RCPT), /* recipients */ | |
059ec3d9 | 442 | |
71fafd95 | 443 | #ifdef WITH_CONTENT_SCAN |
2f079f46 | 444 | (unsigned int) |
fd98a5c6 | 445 | ~((1<<ACL_WHERE_DATA)| /* regex */ |
8ccd00b1 | 446 | #ifndef DISABLE_PRDR |
fd98a5c6 | 447 | (1<<ACL_WHERE_PRDR)| |
8ccd00b1 | 448 | #endif |
fd98a5c6 | 449 | (1<<ACL_WHERE_NOTSMTP)| |
2f079f46 | 450 | (1<<ACL_WHERE_MIME)), |
71fafd95 | 451 | #endif |
8523533c | 452 | |
e7568d51 TL |
453 | (unsigned int) |
454 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| /* remove_header */ | |
455 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
8ccd00b1 | 456 | #ifndef DISABLE_PRDR |
fd98a5c6 JH |
457 | (1<<ACL_WHERE_PRDR)| |
458 | #endif | |
e7568d51 TL |
459 | (1<<ACL_WHERE_MIME)|(1<<ACL_WHERE_NOTSMTP)| |
460 | (1<<ACL_WHERE_NOTSMTP_START)), | |
461 | ||
059ec3d9 PH |
462 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* sender_domains */ |
463 | (1<<ACL_WHERE_HELO)| | |
464 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
465 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
466 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
467 | ||
468 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* senders */ | |
469 | (1<<ACL_WHERE_HELO)| | |
470 | (1<<ACL_WHERE_MAILAUTH)|(1<<ACL_WHERE_QUIT)| | |
471 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
472 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY), | |
473 | ||
474 | 0, /* set */ | |
475 | ||
71fafd95 | 476 | #ifdef WITH_CONTENT_SCAN |
2f079f46 | 477 | (unsigned int) |
fd98a5c6 | 478 | ~((1<<ACL_WHERE_DATA)| /* spam */ |
8ccd00b1 | 479 | #ifndef DISABLE_PRDR |
fd98a5c6 | 480 | (1<<ACL_WHERE_PRDR)| |
8ccd00b1 | 481 | #endif |
fd98a5c6 | 482 | (1<<ACL_WHERE_NOTSMTP)), |
71fafd95 | 483 | #endif |
8523533c | 484 | |
71fafd95 | 485 | #ifdef EXPERIMENTAL_SPF |
8523533c TK |
486 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf */ |
487 | (1<<ACL_WHERE_HELO)| | |
488 | (1<<ACL_WHERE_MAILAUTH)| | |
489 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
45b91596 PH |
490 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY)| |
491 | (1<<ACL_WHERE_NOTSMTP)| | |
492 | (1<<ACL_WHERE_NOTSMTP_START), | |
65a7d8c3 NM |
493 | |
494 | (1<<ACL_WHERE_AUTH)|(1<<ACL_WHERE_CONNECT)| /* spf_guess */ | |
495 | (1<<ACL_WHERE_HELO)| | |
496 | (1<<ACL_WHERE_MAILAUTH)| | |
497 | (1<<ACL_WHERE_ETRN)|(1<<ACL_WHERE_EXPN)| | |
498 | (1<<ACL_WHERE_STARTTLS)|(1<<ACL_WHERE_VRFY)| | |
499 | (1<<ACL_WHERE_NOTSMTP)| | |
500 | (1<<ACL_WHERE_NOTSMTP_START), | |
71fafd95 | 501 | #endif |
8523533c | 502 | |
b0019c78 TF |
503 | 0, /* udpsend */ |
504 | ||
059ec3d9 PH |
505 | /* Certain types of verify are always allowed, so we let it through |
506 | always and check in the verify function itself */ | |
507 | ||
508 | 0 /* verify */ | |
059ec3d9 PH |
509 | }; |
510 | ||
511 | ||
d7bed771 JH |
512 | /* Return values from decode_control(); used as index so keep in step |
513 | with the controls_list table that follows! */ | |
c46782ef | 514 | |
d7bed771 JH |
515 | enum { |
516 | CONTROL_AUTH_UNADVERTISED, | |
3c8b3577 | 517 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
d7bed771 | 518 | CONTROL_BMI_RUN, |
3c8b3577 | 519 | #endif |
d7bed771 JH |
520 | CONTROL_CASEFUL_LOCAL_PART, |
521 | CONTROL_CASELOWER_LOCAL_PART, | |
522 | CONTROL_CUTTHROUGH_DELIVERY, | |
523 | CONTROL_DEBUG, | |
3c8b3577 | 524 | #ifndef DISABLE_DKIM |
d7bed771 | 525 | CONTROL_DKIM_VERIFY, |
3c8b3577 | 526 | #endif |
3c8b3577 | 527 | #ifdef EXPERIMENTAL_DMARC |
d7bed771 JH |
528 | CONTROL_DMARC_VERIFY, |
529 | CONTROL_DMARC_FORENSIC, | |
3c8b3577 | 530 | #endif |
d7bed771 JH |
531 | CONTROL_DSCP, |
532 | CONTROL_ENFORCE_SYNC, | |
533 | CONTROL_ERROR, /* pseudo-value for decode errors */ | |
534 | CONTROL_FAKEDEFER, | |
535 | CONTROL_FAKEREJECT, | |
536 | CONTROL_FREEZE, | |
4840604e | 537 | |
d7bed771 JH |
538 | CONTROL_NO_CALLOUT_FLUSH, |
539 | CONTROL_NO_DELAY_FLUSH, | |
540 | CONTROL_NO_ENFORCE_SYNC, | |
3c8b3577 | 541 | #ifdef WITH_CONTENT_SCAN |
d7bed771 | 542 | CONTROL_NO_MBOX_UNSPOOL, |
3c8b3577 | 543 | #endif |
d7bed771 JH |
544 | CONTROL_NO_MULTILINE, |
545 | CONTROL_NO_PIPELINING, | |
8523533c | 546 | |
d7bed771 JH |
547 | CONTROL_QUEUE_ONLY, |
548 | CONTROL_SUBMISSION, | |
549 | CONTROL_SUPPRESS_LOCAL_FIXUPS, | |
8c5d388a | 550 | #ifdef SUPPORT_I18N |
d7bed771 | 551 | CONTROL_UTF8_DOWNCONVERT, |
3c8b3577 | 552 | #endif |
d7bed771 | 553 | }; |
3c8b3577 | 554 | |
4c590bd1 | 555 | |
c5fcb476 | 556 | |
d7bed771 JH |
557 | /* Structure listing various control arguments, with their characteristics. |
558 | For each control, there's a bitmap of dis-allowed times. For some, it is easier | |
559 | to specify the negation of a small number of allowed times. */ | |
059ec3d9 PH |
560 | |
561 | typedef struct control_def { | |
d7bed771 JH |
562 | uschar *name; |
563 | BOOL has_option; /* Has /option(s) following */ | |
564 | unsigned forbids; /* bitmap of dis-allowed times */ | |
059ec3d9 PH |
565 | } control_def; |
566 | ||
567 | static control_def controls_list[] = { | |
d7bed771 JH |
568 | { US"allow_auth_unadvertised", FALSE, |
569 | (unsigned) | |
570 | ~((1<<ACL_WHERE_CONNECT)|(1<<ACL_WHERE_HELO)) | |
571 | }, | |
8523533c | 572 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
d7bed771 | 573 | { US"bmi_run", FALSE, 0 }, |
fb2274d4 | 574 | #endif |
d7bed771 JH |
575 | { US"caseful_local_part", FALSE, (unsigned) ~(1<<ACL_WHERE_RCPT) }, |
576 | { US"caselower_local_part", FALSE, (unsigned) ~(1<<ACL_WHERE_RCPT) }, | |
577 | { US"cutthrough_delivery", TRUE, 0 }, | |
578 | { US"debug", TRUE, 0 }, | |
579 | ||
80a47a2c | 580 | #ifndef DISABLE_DKIM |
d7bed771 JH |
581 | { US"dkim_disable_verify", FALSE, |
582 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)| | |
583 | # ifndef DISABLE_PRDR | |
584 | (1<<ACL_WHERE_PRDR)| | |
585 | # endif | |
586 | (1<<ACL_WHERE_NOTSMTP_START) | |
587 | }, | |
4840604e | 588 | #endif |
d7bed771 | 589 | |
4840604e | 590 | #ifdef EXPERIMENTAL_DMARC |
d7bed771 JH |
591 | { US"dmarc_disable_verify", FALSE, |
592 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_NOTSMTP_START) | |
593 | }, | |
594 | { US"dmarc_enable_forensic", FALSE, | |
595 | (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_NOTSMTP_START) | |
596 | }, | |
597 | #endif | |
598 | ||
599 | { US"dscp", TRUE, | |
600 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_NOTSMTP_START)|(1<<ACL_WHERE_NOTQUIT) | |
601 | }, | |
602 | { US"enforce_sync", FALSE, | |
603 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_NOTSMTP_START) | |
604 | }, | |
605 | ||
606 | /* Pseudo-value for decode errors */ | |
607 | { US"error", FALSE, 0 }, | |
608 | ||
609 | { US"fakedefer", TRUE, | |
610 | (unsigned) | |
611 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| | |
612 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
613 | #ifndef DISABLE_PRDR | |
614 | (1<<ACL_WHERE_PRDR)| | |
615 | #endif | |
616 | (1<<ACL_WHERE_MIME)) | |
617 | }, | |
618 | { US"fakereject", TRUE, | |
619 | (unsigned) | |
620 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| | |
621 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
622 | #ifndef DISABLE_PRDR | |
623 | (1<<ACL_WHERE_PRDR)| | |
624 | #endif | |
625 | (1<<ACL_WHERE_MIME)) | |
626 | }, | |
627 | { US"freeze", TRUE, | |
628 | (unsigned) | |
629 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| | |
630 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
631 | // (1<<ACL_WHERE_PRDR)| /* Not allow one user to freeze for all */ | |
632 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)) | |
633 | }, | |
634 | ||
635 | { US"no_callout_flush", FALSE, | |
636 | (1<<ACL_WHERE_NOTSMTP)| (1<<ACL_WHERE_NOTSMTP_START) | |
637 | }, | |
638 | { US"no_delay_flush", FALSE, | |
639 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_NOTSMTP_START) | |
640 | }, | |
641 | ||
642 | { US"no_enforce_sync", FALSE, | |
643 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_NOTSMTP_START) | |
644 | }, | |
8523533c | 645 | #ifdef WITH_CONTENT_SCAN |
d7bed771 JH |
646 | { US"no_mbox_unspool", FALSE, |
647 | (unsigned) | |
648 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| | |
649 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
650 | // (1<<ACL_WHERE_PRDR)| /* Not allow one user to freeze for all */ | |
651 | (1<<ACL_WHERE_MIME)) | |
652 | }, | |
653 | #endif | |
654 | { US"no_multiline_responses", FALSE, | |
655 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_NOTSMTP_START) | |
656 | }, | |
657 | { US"no_pipelining", FALSE, | |
658 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_NOTSMTP_START) | |
659 | }, | |
660 | ||
661 | { US"queue_only", FALSE, | |
662 | (unsigned) | |
663 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)| | |
664 | (1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)| | |
665 | // (1<<ACL_WHERE_PRDR)| /* Not allow one user to freeze for all */ | |
666 | (1<<ACL_WHERE_NOTSMTP)|(1<<ACL_WHERE_MIME)) | |
667 | }, | |
668 | { US"submission", TRUE, | |
669 | (unsigned) | |
670 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)) | |
671 | }, | |
672 | { US"suppress_local_fixups", FALSE, | |
673 | (unsigned) | |
674 | ~((1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT)|(1<<ACL_WHERE_PREDATA)| | |
675 | (1<<ACL_WHERE_NOTSMTP_START)) | |
676 | }, | |
8c5d388a | 677 | #ifdef SUPPORT_I18N |
d7bed771 | 678 | { US"utf8_downconvert", TRUE, 0 } |
3c8b3577 | 679 | #endif |
d7bed771 | 680 | }; |
059ec3d9 | 681 | |
e5a9dba6 PH |
682 | /* Support data structures for Client SMTP Authorization. acl_verify_csa() |
683 | caches its result in a tree to avoid repeated DNS queries. The result is an | |
684 | integer code which is used as an index into the following tables of | |
685 | explanatory strings and verification return codes. */ | |
686 | ||
687 | static tree_node *csa_cache = NULL; | |
688 | ||
689 | enum { CSA_UNKNOWN, CSA_OK, CSA_DEFER_SRV, CSA_DEFER_ADDR, | |
690 | CSA_FAIL_EXPLICIT, CSA_FAIL_DOMAIN, CSA_FAIL_NOADDR, CSA_FAIL_MISMATCH }; | |
691 | ||
692 | /* The acl_verify_csa() return code is translated into an acl_verify() return | |
693 | code using the following table. It is OK unless the client is definitely not | |
694 | authorized. This is because CSA is supposed to be optional for sending sites, | |
695 | so recipients should not be too strict about checking it - especially because | |
696 | DNS problems are quite likely to occur. It's possible to use $csa_status in | |
697 | further ACL conditions to distinguish ok, unknown, and defer if required, but | |
698 | the aim is to make the usual configuration simple. */ | |
699 | ||
700 | static int csa_return_code[] = { | |
701 | OK, OK, OK, OK, | |
702 | FAIL, FAIL, FAIL, FAIL | |
703 | }; | |
704 | ||
705 | static uschar *csa_status_string[] = { | |
706 | US"unknown", US"ok", US"defer", US"defer", | |
707 | US"fail", US"fail", US"fail", US"fail" | |
708 | }; | |
709 | ||
710 | static uschar *csa_reason_string[] = { | |
711 | US"unknown", | |
712 | US"ok", | |
713 | US"deferred (SRV lookup failed)", | |
714 | US"deferred (target address lookup failed)", | |
715 | US"failed (explicit authorization required)", | |
716 | US"failed (host name not authorized)", | |
717 | US"failed (no authorized addresses)", | |
718 | US"failed (client address mismatch)" | |
719 | }; | |
720 | ||
c99ce5c9 TF |
721 | /* Options for the ratelimit condition. Note that there are two variants of |
722 | the per_rcpt option, depending on the ACL that is used to measure the rate. | |
723 | However any ACL must be able to look up per_rcpt rates in /noupdate mode, | |
724 | so the two variants must have the same internal representation as well as | |
725 | the same configuration string. */ | |
726 | ||
727 | enum { | |
728 | RATE_PER_WHAT, RATE_PER_CLASH, RATE_PER_ADDR, RATE_PER_BYTE, RATE_PER_CMD, | |
729 | RATE_PER_CONN, RATE_PER_MAIL, RATE_PER_RCPT, RATE_PER_ALLRCPTS | |
730 | }; | |
731 | ||
732 | #define RATE_SET(var,new) \ | |
733 | (((var) == RATE_PER_WHAT) ? ((var) = RATE_##new) : ((var) = RATE_PER_CLASH)) | |
734 | ||
735 | static uschar *ratelimit_option_string[] = { | |
736 | US"?", US"!", US"per_addr", US"per_byte", US"per_cmd", | |
737 | US"per_conn", US"per_mail", US"per_rcpt", US"per_rcpt" | |
738 | }; | |
739 | ||
059ec3d9 PH |
740 | /* Enable recursion between acl_check_internal() and acl_check_condition() */ |
741 | ||
55414b25 | 742 | static int acl_check_wargs(int, address_item *, const uschar *, int, uschar **, |
f60d98e8 | 743 | uschar **); |
059ec3d9 PH |
744 | |
745 | ||
d7bed771 JH |
746 | /************************************************* |
747 | * Find control in list * | |
748 | *************************************************/ | |
749 | ||
750 | /* The lists are always in order, so binary chop can be used. | |
751 | ||
752 | Arguments: | |
753 | name the control name to search for | |
754 | ol the first entry in the control list | |
755 | last one more than the offset of the last entry in the control list | |
756 | ||
757 | Returns: index of a control entry, or -1 if not found | |
758 | */ | |
759 | ||
760 | static int | |
761 | find_control(const uschar * name, control_def * ol, int last) | |
762 | { | |
763 | int first = 0; | |
764 | while (last > first) | |
765 | { | |
766 | int middle = (first + last)/2; | |
767 | uschar * s = ol[middle].name; | |
768 | int c = Ustrncmp(name, s, Ustrlen(s)); | |
769 | if (c == 0) return middle; | |
770 | else if (c > 0) first = middle + 1; | |
771 | else last = middle; | |
772 | } | |
773 | return -1; | |
774 | } | |
775 | ||
776 | ||
777 | ||
059ec3d9 PH |
778 | /************************************************* |
779 | * Pick out name from list * | |
780 | *************************************************/ | |
781 | ||
782 | /* Use a binary chop method | |
783 | ||
784 | Arguments: | |
785 | name name to find | |
786 | list list of names | |
787 | end size of list | |
788 | ||
789 | Returns: offset in list, or -1 if not found | |
790 | */ | |
791 | ||
792 | static int | |
793 | acl_checkname(uschar *name, uschar **list, int end) | |
794 | { | |
795 | int start = 0; | |
796 | ||
797 | while (start < end) | |
798 | { | |
799 | int mid = (start + end)/2; | |
800 | int c = Ustrcmp(name, list[mid]); | |
801 | if (c == 0) return mid; | |
802 | if (c < 0) end = mid; else start = mid + 1; | |
803 | } | |
804 | ||
805 | return -1; | |
806 | } | |
807 | ||
808 | ||
809 | /************************************************* | |
810 | * Read and parse one ACL * | |
811 | *************************************************/ | |
812 | ||
813 | /* This function is called both from readconf in order to parse the ACLs in the | |
814 | configuration file, and also when an ACL is encountered dynamically (e.g. as | |
815 | the result of an expansion). It is given a function to call in order to | |
816 | retrieve the lines of the ACL. This function handles skipping comments and | |
817 | blank lines (where relevant). | |
818 | ||
819 | Arguments: | |
820 | func function to get next line of ACL | |
821 | error where to put an error message | |
822 | ||
823 | Returns: pointer to ACL, or NULL | |
824 | NULL can be legal (empty ACL); in this case error will be NULL | |
825 | */ | |
826 | ||
827 | acl_block * | |
828 | acl_read(uschar *(*func)(void), uschar **error) | |
829 | { | |
830 | acl_block *yield = NULL; | |
831 | acl_block **lastp = &yield; | |
832 | acl_block *this = NULL; | |
833 | acl_condition_block *cond; | |
834 | acl_condition_block **condp = NULL; | |
835 | uschar *s; | |
836 | ||
837 | *error = NULL; | |
838 | ||
839 | while ((s = (*func)()) != NULL) | |
840 | { | |
841 | int v, c; | |
842 | BOOL negated = FALSE; | |
843 | uschar *saveline = s; | |
844 | uschar name[64]; | |
845 | ||
846 | /* Conditions (but not verbs) are allowed to be negated by an initial | |
847 | exclamation mark. */ | |
848 | ||
849 | while (isspace(*s)) s++; | |
850 | if (*s == '!') | |
851 | { | |
852 | negated = TRUE; | |
853 | s++; | |
854 | } | |
855 | ||
cf00dad6 PH |
856 | /* Read the name of a verb or a condition, or the start of a new ACL, which |
857 | can be started by a name, or by a macro definition. */ | |
059ec3d9 PH |
858 | |
859 | s = readconf_readname(name, sizeof(name), s); | |
b8dc3e4a | 860 | if (*s == ':' || (isupper(name[0]) && *s == '=')) return yield; |
059ec3d9 PH |
861 | |
862 | /* If a verb is unrecognized, it may be another condition or modifier that | |
863 | continues the previous verb. */ | |
864 | ||
865 | v = acl_checkname(name, verbs, sizeof(verbs)/sizeof(char *)); | |
866 | if (v < 0) | |
867 | { | |
868 | if (this == NULL) | |
869 | { | |
4e167a8c PH |
870 | *error = string_sprintf("unknown ACL verb \"%s\" in \"%s\"", name, |
871 | saveline); | |
059ec3d9 PH |
872 | return NULL; |
873 | } | |
874 | } | |
875 | ||
876 | /* New verb */ | |
877 | ||
878 | else | |
879 | { | |
880 | if (negated) | |
881 | { | |
882 | *error = string_sprintf("malformed ACL line \"%s\"", saveline); | |
883 | return NULL; | |
884 | } | |
885 | this = store_get(sizeof(acl_block)); | |
886 | *lastp = this; | |
887 | lastp = &(this->next); | |
888 | this->next = NULL; | |
889 | this->verb = v; | |
890 | this->condition = NULL; | |
891 | condp = &(this->condition); | |
892 | if (*s == 0) continue; /* No condition on this line */ | |
893 | if (*s == '!') | |
894 | { | |
895 | negated = TRUE; | |
896 | s++; | |
897 | } | |
898 | s = readconf_readname(name, sizeof(name), s); /* Condition name */ | |
899 | } | |
900 | ||
901 | /* Handle a condition or modifier. */ | |
902 | ||
903 | c = acl_checkname(name, conditions, sizeof(conditions)/sizeof(char *)); | |
904 | if (c < 0) | |
905 | { | |
906 | *error = string_sprintf("unknown ACL condition/modifier in \"%s\"", | |
907 | saveline); | |
908 | return NULL; | |
909 | } | |
910 | ||
911 | /* The modifiers may not be negated */ | |
912 | ||
913 | if (negated && cond_modifiers[c]) | |
914 | { | |
915 | *error = string_sprintf("ACL error: negation is not allowed with " | |
916 | "\"%s\"", conditions[c]); | |
917 | return NULL; | |
918 | } | |
919 | ||
920 | /* ENDPASS may occur only with ACCEPT or DISCARD. */ | |
921 | ||
922 | if (c == ACLC_ENDPASS && | |
923 | this->verb != ACL_ACCEPT && | |
924 | this->verb != ACL_DISCARD) | |
925 | { | |
926 | *error = string_sprintf("ACL error: \"%s\" is not allowed with \"%s\"", | |
927 | conditions[c], verbs[this->verb]); | |
928 | return NULL; | |
929 | } | |
930 | ||
931 | cond = store_get(sizeof(acl_condition_block)); | |
932 | cond->next = NULL; | |
933 | cond->type = c; | |
934 | cond->u.negated = negated; | |
935 | ||
936 | *condp = cond; | |
937 | condp = &(cond->next); | |
938 | ||
939 | /* The "set" modifier is different in that its argument is "name=value" | |
940 | rather than just a value, and we can check the validity of the name, which | |
38a0a95f PH |
941 | gives us a variable name to insert into the data block. The original ACL |
942 | variable names were acl_c0 ... acl_c9 and acl_m0 ... acl_m9. This was | |
943 | extended to 20 of each type, but after that people successfully argued for | |
641cb756 PH |
944 | arbitrary names. In the new scheme, the names must start with acl_c or acl_m. |
945 | After that, we allow alphanumerics and underscores, but the first character | |
946 | after c or m must be a digit or an underscore. This retains backwards | |
947 | compatibility. */ | |
059ec3d9 PH |
948 | |
949 | if (c == ACLC_SET) | |
950 | { | |
47ca6d6c PH |
951 | uschar *endptr; |
952 | ||
38a0a95f PH |
953 | if (Ustrncmp(s, "acl_c", 5) != 0 && |
954 | Ustrncmp(s, "acl_m", 5) != 0) | |
47ca6d6c | 955 | { |
38a0a95f PH |
956 | *error = string_sprintf("invalid variable name after \"set\" in ACL " |
957 | "modifier \"set %s\" (must start \"acl_c\" or \"acl_m\")", s); | |
958 | return NULL; | |
47ca6d6c | 959 | } |
38a0a95f PH |
960 | |
961 | endptr = s + 5; | |
641cb756 PH |
962 | if (!isdigit(*endptr) && *endptr != '_') |
963 | { | |
964 | *error = string_sprintf("invalid variable name after \"set\" in ACL " | |
965 | "modifier \"set %s\" (digit or underscore must follow acl_c or acl_m)", | |
966 | s); | |
967 | return NULL; | |
968 | } | |
969 | ||
38a0a95f | 970 | while (*endptr != 0 && *endptr != '=' && !isspace(*endptr)) |
47ca6d6c | 971 | { |
38a0a95f PH |
972 | if (!isalnum(*endptr) && *endptr != '_') |
973 | { | |
974 | *error = string_sprintf("invalid character \"%c\" in variable name " | |
975 | "in ACL modifier \"set %s\"", *endptr, s); | |
976 | return NULL; | |
977 | } | |
978 | endptr++; | |
47ca6d6c | 979 | } |
47ca6d6c | 980 | |
38a0a95f | 981 | cond->u.varname = string_copyn(s + 4, endptr - s - 4); |
47ca6d6c | 982 | s = endptr; |
059ec3d9 PH |
983 | while (isspace(*s)) s++; |
984 | } | |
985 | ||
986 | /* For "set", we are now positioned for the data. For the others, only | |
987 | "endpass" has no data */ | |
988 | ||
989 | if (c != ACLC_ENDPASS) | |
990 | { | |
991 | if (*s++ != '=') | |
992 | { | |
993 | *error = string_sprintf("\"=\" missing after ACL \"%s\" %s", name, | |
994 | cond_modifiers[c]? US"modifier" : US"condition"); | |
995 | return NULL; | |
996 | } | |
997 | while (isspace(*s)) s++; | |
998 | cond->arg = string_copy(s); | |
999 | } | |
1000 | } | |
1001 | ||
1002 | return yield; | |
1003 | } | |
1004 | ||
1005 | ||
1006 | ||
71fafd95 PH |
1007 | /************************************************* |
1008 | * Set up added header line(s) * | |
1009 | *************************************************/ | |
1010 | ||
1011 | /* This function is called by the add_header modifier, and also from acl_warn() | |
1012 | to implement the now-deprecated way of adding header lines using "message" on a | |
1013 | "warn" verb. The argument is treated as a sequence of header lines which are | |
1014 | added to a chain, provided there isn't an identical one already there. | |
1015 | ||
1016 | Argument: string of header lines | |
1017 | Returns: nothing | |
1018 | */ | |
1019 | ||
1020 | static void | |
55414b25 | 1021 | setup_header(const uschar *hstring) |
71fafd95 | 1022 | { |
55414b25 | 1023 | const uschar *p, *q; |
71fafd95 PH |
1024 | int hlen = Ustrlen(hstring); |
1025 | ||
b1b05573 JH |
1026 | /* Ignore any leading newlines */ |
1027 | while (*hstring == '\n') hstring++, hlen--; | |
71fafd95 | 1028 | |
b1b05573 | 1029 | /* An empty string does nothing; ensure exactly one final newline. */ |
71fafd95 | 1030 | if (hlen <= 0) return; |
96f5fe4c | 1031 | if (hstring[--hlen] != '\n') /* no newline */ |
55414b25 | 1032 | q = string_sprintf("%s\n", hstring); |
96f5fe4c | 1033 | else if (hstring[hlen-1] == '\n') /* double newline */ |
55414b25 JH |
1034 | { |
1035 | uschar * s = string_copy(hstring); | |
1036 | while(s[--hlen] == '\n') | |
1037 | s[hlen+1] = '\0'; | |
1038 | q = s; | |
1039 | } | |
1040 | else | |
1041 | q = hstring; | |
71fafd95 PH |
1042 | |
1043 | /* Loop for multiple header lines, taking care about continuations */ | |
1044 | ||
55414b25 | 1045 | for (p = q; *p != 0; ) |
71fafd95 | 1046 | { |
55414b25 JH |
1047 | const uschar *s; |
1048 | uschar * hdr; | |
71fafd95 PH |
1049 | int newtype = htype_add_bot; |
1050 | header_line **hptr = &acl_added_headers; | |
1051 | ||
1052 | /* Find next header line within the string */ | |
1053 | ||
1054 | for (;;) | |
1055 | { | |
96f5fe4c | 1056 | q = Ustrchr(q, '\n'); /* we know there was a newline */ |
71fafd95 PH |
1057 | if (*(++q) != ' ' && *q != '\t') break; |
1058 | } | |
1059 | ||
1060 | /* If the line starts with a colon, interpret the instruction for where to | |
1061 | add it. This temporarily sets up a new type. */ | |
1062 | ||
1063 | if (*p == ':') | |
1064 | { | |
1065 | if (strncmpic(p, US":after_received:", 16) == 0) | |
1066 | { | |
1067 | newtype = htype_add_rec; | |
1068 | p += 16; | |
1069 | } | |
1070 | else if (strncmpic(p, US":at_start_rfc:", 14) == 0) | |
1071 | { | |
1072 | newtype = htype_add_rfc; | |
1073 | p += 14; | |
1074 | } | |
1075 | else if (strncmpic(p, US":at_start:", 10) == 0) | |
1076 | { | |
1077 | newtype = htype_add_top; | |
1078 | p += 10; | |
1079 | } | |
1080 | else if (strncmpic(p, US":at_end:", 8) == 0) | |
1081 | { | |
1082 | newtype = htype_add_bot; | |
1083 | p += 8; | |
1084 | } | |
1085 | while (*p == ' ' || *p == '\t') p++; | |
1086 | } | |
1087 | ||
1088 | /* See if this line starts with a header name, and if not, add X-ACL-Warn: | |
1089 | to the front of it. */ | |
1090 | ||
1091 | for (s = p; s < q - 1; s++) | |
1092 | { | |
1093 | if (*s == ':' || !isgraph(*s)) break; | |
1094 | } | |
1095 | ||
55414b25 JH |
1096 | hdr = string_sprintf("%s%.*s", (*s == ':')? "" : "X-ACL-Warn: ", (int) (q - p), p); |
1097 | hlen = Ustrlen(hdr); | |
71fafd95 PH |
1098 | |
1099 | /* See if this line has already been added */ | |
1100 | ||
1101 | while (*hptr != NULL) | |
1102 | { | |
55414b25 | 1103 | if (Ustrncmp((*hptr)->text, hdr, hlen) == 0) break; |
71fafd95 PH |
1104 | hptr = &((*hptr)->next); |
1105 | } | |
1106 | ||
1107 | /* Add if not previously present */ | |
1108 | ||
1109 | if (*hptr == NULL) | |
1110 | { | |
1111 | header_line *h = store_get(sizeof(header_line)); | |
55414b25 | 1112 | h->text = hdr; |
71fafd95 PH |
1113 | h->next = NULL; |
1114 | h->type = newtype; | |
1115 | h->slen = hlen; | |
1116 | *hptr = h; | |
1117 | hptr = &(h->next); | |
1118 | } | |
1119 | ||
1120 | /* Advance for next header line within the string */ | |
1121 | ||
1122 | p = q; | |
1123 | } | |
1124 | } | |
1125 | ||
1126 | ||
1127 | ||
362145b5 JH |
1128 | /************************************************* |
1129 | * List the added header lines * | |
1130 | *************************************************/ | |
1131 | uschar * | |
1132 | fn_hdrs_added(void) | |
1133 | { | |
1134 | uschar * ret = NULL; | |
5f5be492 JH |
1135 | int size = 0; |
1136 | int ptr = 0; | |
362145b5 JH |
1137 | header_line * h = acl_added_headers; |
1138 | uschar * s; | |
1139 | uschar * cp; | |
362145b5 JH |
1140 | |
1141 | if (!h) return NULL; | |
1142 | ||
1143 | do | |
1144 | { | |
1145 | s = h->text; | |
1146 | while ((cp = Ustrchr(s, '\n')) != NULL) | |
1147 | { | |
1148 | if (cp[1] == '\0') break; | |
1149 | ||
1150 | /* contains embedded newline; needs doubling */ | |
c2f669a4 JH |
1151 | ret = string_catn(ret, &size, &ptr, s, cp-s+1); |
1152 | ret = string_catn(ret, &size, &ptr, US"\n", 1); | |
362145b5 JH |
1153 | s = cp+1; |
1154 | } | |
1155 | /* last bit of header */ | |
1156 | ||
c2f669a4 | 1157 | ret = string_catn(ret, &size, &ptr, s, cp-s+1); /* newline-sep list */ |
362145b5 | 1158 | } |
6d9cfc47 | 1159 | while((h = h->next)); |
362145b5 JH |
1160 | |
1161 | ret[ptr-1] = '\0'; /* overwrite last newline */ | |
1162 | return ret; | |
1163 | } | |
1164 | ||
1165 | ||
e7568d51 TL |
1166 | /************************************************* |
1167 | * Set up removed header line(s) * | |
1168 | *************************************************/ | |
1169 | ||
1170 | /* This function is called by the remove_header modifier. The argument is | |
1171 | treated as a sequence of header names which are added to a colon separated | |
1172 | list, provided there isn't an identical one already there. | |
1173 | ||
1174 | Argument: string of header names | |
1175 | Returns: nothing | |
1176 | */ | |
1177 | ||
1178 | static void | |
55414b25 | 1179 | setup_remove_header(const uschar *hnames) |
e7568d51 TL |
1180 | { |
1181 | if (*hnames != 0) | |
55414b25 JH |
1182 | acl_removed_headers = acl_removed_headers |
1183 | ? string_sprintf("%s : %s", acl_removed_headers, hnames) | |
1184 | : string_copy(hnames); | |
e7568d51 TL |
1185 | } |
1186 | ||
1187 | ||
71fafd95 | 1188 | |
059ec3d9 PH |
1189 | /************************************************* |
1190 | * Handle warnings * | |
1191 | *************************************************/ | |
1192 | ||
1193 | /* This function is called when a WARN verb's conditions are true. It adds to | |
1194 | the message's headers, and/or writes information to the log. In each case, this | |
1195 | only happens once (per message for headers, per connection for log). | |
1196 | ||
71fafd95 PH |
1197 | ** NOTE: The header adding action using the "message" setting is historic, and |
1198 | its use is now deprecated. The new add_header modifier should be used instead. | |
1199 | ||
059ec3d9 PH |
1200 | Arguments: |
1201 | where ACL_WHERE_xxxx indicating which ACL this is | |
1202 | user_message message for adding to headers | |
1203 | log_message message for logging, if different | |
1204 | ||
1205 | Returns: nothing | |
1206 | */ | |
1207 | ||
1208 | static void | |
1209 | acl_warn(int where, uschar *user_message, uschar *log_message) | |
1210 | { | |
059ec3d9 PH |
1211 | if (log_message != NULL && log_message != user_message) |
1212 | { | |
1213 | uschar *text; | |
1214 | string_item *logged; | |
1215 | ||
1216 | text = string_sprintf("%s Warning: %s", host_and_ident(TRUE), | |
1217 | string_printing(log_message)); | |
1218 | ||
1219 | /* If a sender verification has failed, and the log message is "sender verify | |
1220 | failed", add the failure message. */ | |
1221 | ||
1222 | if (sender_verified_failed != NULL && | |
1223 | sender_verified_failed->message != NULL && | |
1224 | strcmpic(log_message, US"sender verify failed") == 0) | |
1225 | text = string_sprintf("%s: %s", text, sender_verified_failed->message); | |
1226 | ||
9c7a242c PH |
1227 | /* Search previously logged warnings. They are kept in malloc |
1228 | store so they can be freed at the start of a new message. */ | |
059ec3d9 PH |
1229 | |
1230 | for (logged = acl_warn_logged; logged != NULL; logged = logged->next) | |
1231 | if (Ustrcmp(logged->text, text) == 0) break; | |
1232 | ||
1233 | if (logged == NULL) | |
1234 | { | |
1235 | int length = Ustrlen(text) + 1; | |
1236 | log_write(0, LOG_MAIN, "%s", text); | |
1237 | logged = store_malloc(sizeof(string_item) + length); | |
1238 | logged->text = (uschar *)logged + sizeof(string_item); | |
1239 | memcpy(logged->text, text, length); | |
1240 | logged->next = acl_warn_logged; | |
1241 | acl_warn_logged = logged; | |
1242 | } | |
1243 | } | |
1244 | ||
1245 | /* If there's no user message, we are done. */ | |
1246 | ||
1247 | if (user_message == NULL) return; | |
1248 | ||
1249 | /* If this isn't a message ACL, we can't do anything with a user message. | |
1250 | Log an error. */ | |
1251 | ||
1252 | if (where > ACL_WHERE_NOTSMTP) | |
1253 | { | |
1254 | log_write(0, LOG_MAIN|LOG_PANIC, "ACL \"warn\" with \"message\" setting " | |
1255 | "found in a non-message (%s) ACL: cannot specify header lines here: " | |
1256 | "message ignored", acl_wherenames[where]); | |
1257 | return; | |
1258 | } | |
1259 | ||
71fafd95 PH |
1260 | /* The code for setting up header lines is now abstracted into a separate |
1261 | function so that it can be used for the add_header modifier as well. */ | |
059ec3d9 | 1262 | |
71fafd95 | 1263 | setup_header(user_message); |
059ec3d9 PH |
1264 | } |
1265 | ||
1266 | ||
1267 | ||
1268 | /************************************************* | |
1269 | * Verify and check reverse DNS * | |
1270 | *************************************************/ | |
1271 | ||
1272 | /* Called from acl_verify() below. We look up the host name(s) of the client IP | |
1273 | address if this has not yet been done. The host_name_lookup() function checks | |
1274 | that one of these names resolves to an address list that contains the client IP | |
1275 | address, so we don't actually have to do the check here. | |
1276 | ||
1277 | Arguments: | |
1278 | user_msgptr pointer for user message | |
1279 | log_msgptr pointer for log message | |
1280 | ||
1281 | Returns: OK verification condition succeeded | |
1282 | FAIL verification failed | |
1283 | DEFER there was a problem verifying | |
1284 | */ | |
1285 | ||
1286 | static int | |
1287 | acl_verify_reverse(uschar **user_msgptr, uschar **log_msgptr) | |
1288 | { | |
1289 | int rc; | |
1290 | ||
1291 | user_msgptr = user_msgptr; /* stop compiler warning */ | |
1292 | ||
1293 | /* Previous success */ | |
1294 | ||
1295 | if (sender_host_name != NULL) return OK; | |
1296 | ||
1297 | /* Previous failure */ | |
1298 | ||
1299 | if (host_lookup_failed) | |
1300 | { | |
1301 | *log_msgptr = string_sprintf("host lookup failed%s", host_lookup_msg); | |
1302 | return FAIL; | |
1303 | } | |
1304 | ||
1305 | /* Need to do a lookup */ | |
1306 | ||
1307 | HDEBUG(D_acl) | |
1308 | debug_printf("looking up host name to force name/address consistency check\n"); | |
1309 | ||
1310 | if ((rc = host_name_lookup()) != OK) | |
1311 | { | |
1312 | *log_msgptr = (rc == DEFER)? | |
1313 | US"host lookup deferred for reverse lookup check" | |
1314 | : | |
1315 | string_sprintf("host lookup failed for reverse lookup check%s", | |
1316 | host_lookup_msg); | |
1317 | return rc; /* DEFER or FAIL */ | |
1318 | } | |
1319 | ||
1320 | host_build_sender_fullhost(); | |
1321 | return OK; | |
1322 | } | |
1323 | ||
1324 | ||
1325 | ||
e5a9dba6 PH |
1326 | /************************************************* |
1327 | * Check client IP address matches CSA target * | |
1328 | *************************************************/ | |
1329 | ||
1330 | /* Called from acl_verify_csa() below. This routine scans a section of a DNS | |
1331 | response for address records belonging to the CSA target hostname. The section | |
1332 | is specified by the reset argument, either RESET_ADDITIONAL or RESET_ANSWERS. | |
1333 | If one of the addresses matches the client's IP address, then the client is | |
1334 | authorized by CSA. If there are target IP addresses but none of them match | |
1335 | then the client is using an unauthorized IP address. If there are no target IP | |
1336 | addresses then the client cannot be using an authorized IP address. (This is | |
1337 | an odd configuration - why didn't the SRV record have a weight of 1 instead?) | |
1338 | ||
1339 | Arguments: | |
1340 | dnsa the DNS answer block | |
1341 | dnss a DNS scan block for us to use | |
1342 | reset option specifing what portion to scan, as described above | |
1343 | target the target hostname to use for matching RR names | |
1344 | ||
1345 | Returns: CSA_OK successfully authorized | |
1346 | CSA_FAIL_MISMATCH addresses found but none matched | |
1347 | CSA_FAIL_NOADDR no target addresses found | |
1348 | */ | |
1349 | ||
1350 | static int | |
1351 | acl_verify_csa_address(dns_answer *dnsa, dns_scan *dnss, int reset, | |
1352 | uschar *target) | |
1353 | { | |
1354 | dns_record *rr; | |
1355 | dns_address *da; | |
1356 | ||
1357 | BOOL target_found = FALSE; | |
1358 | ||
1359 | for (rr = dns_next_rr(dnsa, dnss, reset); | |
1360 | rr != NULL; | |
1361 | rr = dns_next_rr(dnsa, dnss, RESET_NEXT)) | |
1362 | { | |
1363 | /* Check this is an address RR for the target hostname. */ | |
1364 | ||
1365 | if (rr->type != T_A | |
1366 | #if HAVE_IPV6 | |
1367 | && rr->type != T_AAAA | |
e5a9dba6 PH |
1368 | #endif |
1369 | ) continue; | |
1370 | ||
1371 | if (strcmpic(target, rr->name) != 0) continue; | |
1372 | ||
1373 | target_found = TRUE; | |
1374 | ||
1375 | /* Turn the target address RR into a list of textual IP addresses and scan | |
1376 | the list. There may be more than one if it is an A6 RR. */ | |
1377 | ||
1378 | for (da = dns_address_from_rr(dnsa, rr); da != NULL; da = da->next) | |
1379 | { | |
1380 | /* If the client IP address matches the target IP address, it's good! */ | |
1381 | ||
1382 | DEBUG(D_acl) debug_printf("CSA target address is %s\n", da->address); | |
1383 | ||
1384 | if (strcmpic(sender_host_address, da->address) == 0) return CSA_OK; | |
1385 | } | |
1386 | } | |
1387 | ||
1388 | /* If we found some target addresses but none of them matched, the client is | |
1389 | using an unauthorized IP address, otherwise the target has no authorized IP | |
1390 | addresses. */ | |
1391 | ||
1392 | if (target_found) return CSA_FAIL_MISMATCH; | |
1393 | else return CSA_FAIL_NOADDR; | |
1394 | } | |
1395 | ||
1396 | ||
1397 | ||
1398 | /************************************************* | |
1399 | * Verify Client SMTP Authorization * | |
1400 | *************************************************/ | |
1401 | ||
1402 | /* Called from acl_verify() below. This routine calls dns_lookup_special() | |
1403 | to find the CSA SRV record corresponding to the domain argument, or | |
1404 | $sender_helo_name if no argument is provided. It then checks that the | |
1405 | client is authorized, and that its IP address corresponds to the SRV | |
1406 | target's address by calling acl_verify_csa_address() above. The address | |
1407 | should have been returned in the DNS response's ADDITIONAL section, but if | |
1408 | not we perform another DNS lookup to get it. | |
1409 | ||
1410 | Arguments: | |
1411 | domain pointer to optional parameter following verify = csa | |
1412 | ||
1413 | Returns: CSA_UNKNOWN no valid CSA record found | |
1414 | CSA_OK successfully authorized | |
1415 | CSA_FAIL_* client is definitely not authorized | |
1416 | CSA_DEFER_* there was a DNS problem | |
1417 | */ | |
1418 | ||
1419 | static int | |
55414b25 | 1420 | acl_verify_csa(const uschar *domain) |
e5a9dba6 PH |
1421 | { |
1422 | tree_node *t; | |
55414b25 JH |
1423 | const uschar *found; |
1424 | uschar *p; | |
e5a9dba6 PH |
1425 | int priority, weight, port; |
1426 | dns_answer dnsa; | |
1427 | dns_scan dnss; | |
1428 | dns_record *rr; | |
1429 | int rc, type; | |
1430 | uschar target[256]; | |
1431 | ||
1432 | /* Work out the domain we are using for the CSA lookup. The default is the | |
1433 | client's HELO domain. If the client has not said HELO, use its IP address | |
1434 | instead. If it's a local client (exim -bs), CSA isn't applicable. */ | |
1435 | ||
1436 | while (isspace(*domain) && *domain != '\0') ++domain; | |
1437 | if (*domain == '\0') domain = sender_helo_name; | |
1438 | if (domain == NULL) domain = sender_host_address; | |
1439 | if (sender_host_address == NULL) return CSA_UNKNOWN; | |
1440 | ||
1441 | /* If we have an address literal, strip off the framing ready for turning it | |
1442 | into a domain. The framing consists of matched square brackets possibly | |
1443 | containing a keyword and a colon before the actual IP address. */ | |
1444 | ||
1445 | if (domain[0] == '[') | |
1446 | { | |
55414b25 | 1447 | const uschar *start = Ustrchr(domain, ':'); |
e5a9dba6 PH |
1448 | if (start == NULL) start = domain; |
1449 | domain = string_copyn(start + 1, Ustrlen(start) - 2); | |
1450 | } | |
1451 | ||
1452 | /* Turn domains that look like bare IP addresses into domains in the reverse | |
1453 | DNS. This code also deals with address literals and $sender_host_address. It's | |
1454 | not quite kosher to treat bare domains such as EHLO 192.0.2.57 the same as | |
1455 | address literals, but it's probably the most friendly thing to do. This is an | |
1456 | extension to CSA, so we allow it to be turned off for proper conformance. */ | |
1457 | ||
7e66e54d | 1458 | if (string_is_ip_address(domain, NULL) != 0) |
e5a9dba6 PH |
1459 | { |
1460 | if (!dns_csa_use_reverse) return CSA_UNKNOWN; | |
1461 | dns_build_reverse(domain, target); | |
1462 | domain = target; | |
1463 | } | |
1464 | ||
1465 | /* Find out if we've already done the CSA check for this domain. If we have, | |
1466 | return the same result again. Otherwise build a new cached result structure | |
1467 | for this domain. The name is filled in now, and the value is filled in when | |
1468 | we return from this function. */ | |
1469 | ||
1470 | t = tree_search(csa_cache, domain); | |
1471 | if (t != NULL) return t->data.val; | |
1472 | ||
1473 | t = store_get_perm(sizeof(tree_node) + Ustrlen(domain)); | |
1474 | Ustrcpy(t->name, domain); | |
1475 | (void)tree_insertnode(&csa_cache, t); | |
1476 | ||
1477 | /* Now we are ready to do the actual DNS lookup(s). */ | |
1478 | ||
28e6ef29 | 1479 | found = domain; |
e5a9dba6 PH |
1480 | switch (dns_special_lookup(&dnsa, domain, T_CSA, &found)) |
1481 | { | |
1482 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1483 | ||
1484 | default: | |
1485 | return t->data.val = CSA_DEFER_SRV; | |
1486 | ||
1487 | /* If we found nothing, the client's authorization is unknown. */ | |
1488 | ||
1489 | case DNS_NOMATCH: | |
1490 | case DNS_NODATA: | |
1491 | return t->data.val = CSA_UNKNOWN; | |
1492 | ||
1493 | /* We got something! Go on to look at the reply in more detail. */ | |
1494 | ||
1495 | case DNS_SUCCEED: | |
1496 | break; | |
1497 | } | |
1498 | ||
1499 | /* Scan the reply for well-formed CSA SRV records. */ | |
1500 | ||
1501 | for (rr = dns_next_rr(&dnsa, &dnss, RESET_ANSWERS); | |
1502 | rr != NULL; | |
1503 | rr = dns_next_rr(&dnsa, &dnss, RESET_NEXT)) | |
1504 | { | |
1505 | if (rr->type != T_SRV) continue; | |
1506 | ||
1507 | /* Extract the numerical SRV fields (p is incremented) */ | |
1508 | ||
1509 | p = rr->data; | |
1510 | GETSHORT(priority, p); | |
1511 | GETSHORT(weight, p); | |
1512 | GETSHORT(port, p); | |
1513 | ||
1514 | DEBUG(D_acl) | |
1515 | debug_printf("CSA priority=%d weight=%d port=%d\n", priority, weight, port); | |
1516 | ||
1517 | /* Check the CSA version number */ | |
1518 | ||
1519 | if (priority != 1) continue; | |
1520 | ||
1521 | /* If the domain does not have a CSA SRV record of its own (i.e. the domain | |
1522 | found by dns_special_lookup() is a parent of the one we asked for), we check | |
1523 | the subdomain assertions in the port field. At the moment there's only one | |
1524 | assertion: legitimate SMTP clients are all explicitly authorized with CSA | |
1525 | SRV records of their own. */ | |
1526 | ||
1dc92d5a | 1527 | if (Ustrcmp(found, domain) != 0) |
e5a9dba6 PH |
1528 | { |
1529 | if (port & 1) | |
1530 | return t->data.val = CSA_FAIL_EXPLICIT; | |
1531 | else | |
1532 | return t->data.val = CSA_UNKNOWN; | |
1533 | } | |
1534 | ||
1535 | /* This CSA SRV record refers directly to our domain, so we check the value | |
1536 | in the weight field to work out the domain's authorization. 0 and 1 are | |
1537 | unauthorized; 3 means the client is authorized but we can't check the IP | |
1538 | address in order to authenticate it, so we treat it as unknown; values | |
1539 | greater than 3 are undefined. */ | |
1540 | ||
1541 | if (weight < 2) return t->data.val = CSA_FAIL_DOMAIN; | |
1542 | ||
1543 | if (weight > 2) continue; | |
1544 | ||
1545 | /* Weight == 2, which means the domain is authorized. We must check that the | |
1546 | client's IP address is listed as one of the SRV target addresses. Save the | |
1547 | target hostname then break to scan the additional data for its addresses. */ | |
1548 | ||
1549 | (void)dn_expand(dnsa.answer, dnsa.answer + dnsa.answerlen, p, | |
1550 | (DN_EXPAND_ARG4_TYPE)target, sizeof(target)); | |
1551 | ||
1552 | DEBUG(D_acl) debug_printf("CSA target is %s\n", target); | |
1553 | ||
1554 | break; | |
1555 | } | |
1556 | ||
1557 | /* If we didn't break the loop then no appropriate records were found. */ | |
1558 | ||
1559 | if (rr == NULL) return t->data.val = CSA_UNKNOWN; | |
1560 | ||
1561 | /* Do not check addresses if the target is ".", in accordance with RFC 2782. | |
1562 | A target of "." indicates there are no valid addresses, so the client cannot | |
1563 | be authorized. (This is an odd configuration because weight=2 target=. is | |
1564 | equivalent to weight=1, but we check for it in order to keep load off the | |
1565 | root name servers.) Note that dn_expand() turns "." into "". */ | |
1566 | ||
1567 | if (Ustrcmp(target, "") == 0) return t->data.val = CSA_FAIL_NOADDR; | |
1568 | ||
1569 | /* Scan the additional section of the CSA SRV reply for addresses belonging | |
1570 | to the target. If the name server didn't return any additional data (e.g. | |
1571 | because it does not fully support SRV records), we need to do another lookup | |
1572 | to obtain the target addresses; otherwise we have a definitive result. */ | |
1573 | ||
1574 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ADDITIONAL, target); | |
1575 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1576 | ||
1577 | /* The DNS lookup type corresponds to the IP version used by the client. */ | |
1578 | ||
1579 | #if HAVE_IPV6 | |
1580 | if (Ustrchr(sender_host_address, ':') != NULL) | |
1581 | type = T_AAAA; | |
1582 | else | |
1583 | #endif /* HAVE_IPV6 */ | |
1584 | type = T_A; | |
1585 | ||
1586 | ||
4e0983dc | 1587 | lookup_dnssec_authenticated = NULL; |
e5a9dba6 PH |
1588 | switch (dns_lookup(&dnsa, target, type, NULL)) |
1589 | { | |
1590 | /* If something bad happened (most commonly DNS_AGAIN), defer. */ | |
1591 | ||
1592 | default: | |
cc00f4af | 1593 | return t->data.val = CSA_DEFER_ADDR; |
e5a9dba6 PH |
1594 | |
1595 | /* If the query succeeded, scan the addresses and return the result. */ | |
1596 | ||
1597 | case DNS_SUCCEED: | |
cc00f4af JH |
1598 | rc = acl_verify_csa_address(&dnsa, &dnss, RESET_ANSWERS, target); |
1599 | if (rc != CSA_FAIL_NOADDR) return t->data.val = rc; | |
1600 | /* else fall through */ | |
e5a9dba6 PH |
1601 | |
1602 | /* If the target has no IP addresses, the client cannot have an authorized | |
1603 | IP address. However, if the target site uses A6 records (not AAAA records) | |
1604 | we have to do yet another lookup in order to check them. */ | |
1605 | ||
1606 | case DNS_NOMATCH: | |
1607 | case DNS_NODATA: | |
cc00f4af | 1608 | return t->data.val = CSA_FAIL_NOADDR; |
e5a9dba6 PH |
1609 | } |
1610 | } | |
1611 | ||
1612 | ||
1613 | ||
059ec3d9 PH |
1614 | /************************************************* |
1615 | * Handle verification (address & other) * | |
1616 | *************************************************/ | |
1617 | ||
89583014 | 1618 | enum { VERIFY_REV_HOST_LKUP, VERIFY_CERT, VERIFY_HELO, VERIFY_CSA, VERIFY_HDR_SYNTAX, |
770747fd MFM |
1619 | VERIFY_NOT_BLIND, VERIFY_HDR_SNDR, VERIFY_SNDR, VERIFY_RCPT, |
1620 | VERIFY_HDR_NAMES_ASCII | |
89583014 JH |
1621 | }; |
1622 | typedef struct { | |
1623 | uschar * name; | |
1624 | int value; | |
1625 | unsigned where_allowed; /* bitmap */ | |
1626 | BOOL no_options; /* Never has /option(s) following */ | |
1627 | unsigned alt_opt_sep; /* >0 Non-/ option separator (custom parser) */ | |
1628 | } verify_type_t; | |
1629 | static verify_type_t verify_type_list[] = { | |
7e8360e6 | 1630 | { US"reverse_host_lookup", VERIFY_REV_HOST_LKUP, ~0, FALSE, 0 }, |
89583014 JH |
1631 | { US"certificate", VERIFY_CERT, ~0, TRUE, 0 }, |
1632 | { US"helo", VERIFY_HELO, ~0, TRUE, 0 }, | |
1633 | { US"csa", VERIFY_CSA, ~0, FALSE, 0 }, | |
1634 | { US"header_syntax", VERIFY_HDR_SYNTAX, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), TRUE, 0 }, | |
1635 | { US"not_blind", VERIFY_NOT_BLIND, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), TRUE, 0 }, | |
1636 | { US"header_sender", VERIFY_HDR_SNDR, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), FALSE, 0 }, | |
1637 | { US"sender", VERIFY_SNDR, (1<<ACL_WHERE_MAIL)|(1<<ACL_WHERE_RCPT) | |
1638 | |(1<<ACL_WHERE_PREDATA)|(1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), | |
1639 | FALSE, 6 }, | |
770747fd MFM |
1640 | { US"recipient", VERIFY_RCPT, (1<<ACL_WHERE_RCPT), FALSE, 0 }, |
1641 | { US"header_names_ascii", VERIFY_HDR_NAMES_ASCII, (1<<ACL_WHERE_DATA)|(1<<ACL_WHERE_NOTSMTP), TRUE, 0 } | |
89583014 JH |
1642 | }; |
1643 | ||
1644 | ||
1645 | enum { CALLOUT_DEFER_OK, CALLOUT_NOCACHE, CALLOUT_RANDOM, CALLOUT_USE_SENDER, | |
1646 | CALLOUT_USE_POSTMASTER, CALLOUT_POSTMASTER, CALLOUT_FULLPOSTMASTER, | |
1647 | CALLOUT_MAILFROM, CALLOUT_POSTMASTER_MAILFROM, CALLOUT_MAXWAIT, CALLOUT_CONNECT, | |
1648 | CALLOUT_TIME | |
1649 | }; | |
1650 | typedef struct { | |
1651 | uschar * name; | |
1652 | int value; | |
1653 | int flag; | |
1654 | BOOL has_option; /* Has =option(s) following */ | |
1655 | BOOL timeval; /* Has a time value */ | |
1656 | } callout_opt_t; | |
1657 | static callout_opt_t callout_opt_list[] = { | |
1658 | { US"defer_ok", CALLOUT_DEFER_OK, 0, FALSE, FALSE }, | |
1659 | { US"no_cache", CALLOUT_NOCACHE, vopt_callout_no_cache, FALSE, FALSE }, | |
1660 | { US"random", CALLOUT_RANDOM, vopt_callout_random, FALSE, FALSE }, | |
1661 | { US"use_sender", CALLOUT_USE_SENDER, vopt_callout_recipsender, FALSE, FALSE }, | |
1662 | { US"use_postmaster", CALLOUT_USE_POSTMASTER,vopt_callout_recippmaster, FALSE, FALSE }, | |
1663 | { US"postmaster_mailfrom",CALLOUT_POSTMASTER_MAILFROM,0, TRUE, FALSE }, | |
1664 | { US"postmaster", CALLOUT_POSTMASTER, 0, FALSE, FALSE }, | |
1665 | { US"fullpostmaster", CALLOUT_FULLPOSTMASTER,vopt_callout_fullpm, FALSE, FALSE }, | |
1666 | { US"mailfrom", CALLOUT_MAILFROM, 0, TRUE, FALSE }, | |
1667 | { US"maxwait", CALLOUT_MAXWAIT, 0, TRUE, TRUE }, | |
1668 | { US"connect", CALLOUT_CONNECT, 0, TRUE, TRUE }, | |
1669 | { NULL, CALLOUT_TIME, 0, FALSE, TRUE } | |
1670 | }; | |
1671 | ||
1672 | ||
1673 | ||
059ec3d9 PH |
1674 | /* This function implements the "verify" condition. It is called when |
1675 | encountered in any ACL, because some tests are almost always permitted. Some | |
1676 | just don't make sense, and always fail (for example, an attempt to test a host | |
1677 | lookup for a non-TCP/IP message). Others are restricted to certain ACLs. | |
1678 | ||
1679 | Arguments: | |
1680 | where where called from | |
1681 | addr the recipient address that the ACL is handling, or NULL | |
1682 | arg the argument of "verify" | |
1683 | user_msgptr pointer for user message | |
1684 | log_msgptr pointer for log message | |
1685 | basic_errno where to put verify errno | |
1686 | ||
1687 | Returns: OK verification condition succeeded | |
1688 | FAIL verification failed | |
1689 | DEFER there was a problem verifying | |
1690 | ERROR syntax error | |
1691 | */ | |
1692 | ||
1693 | static int | |
55414b25 | 1694 | acl_verify(int where, address_item *addr, const uschar *arg, |
059ec3d9 PH |
1695 | uschar **user_msgptr, uschar **log_msgptr, int *basic_errno) |
1696 | { | |
1697 | int sep = '/'; | |
1698 | int callout = -1; | |
1699 | int callout_overall = -1; | |
4deaf07d | 1700 | int callout_connect = -1; |
059ec3d9 PH |
1701 | int verify_options = 0; |
1702 | int rc; | |
1703 | BOOL verify_header_sender = FALSE; | |
1704 | BOOL defer_ok = FALSE; | |
1705 | BOOL callout_defer_ok = FALSE; | |
1706 | BOOL no_details = FALSE; | |
eafd343b | 1707 | BOOL success_on_redirect = FALSE; |
059ec3d9 PH |
1708 | address_item *sender_vaddr = NULL; |
1709 | uschar *verify_sender_address = NULL; | |
1710 | uschar *pm_mailfrom = NULL; | |
1711 | uschar *se_mailfrom = NULL; | |
596875b3 PH |
1712 | |
1713 | /* Some of the verify items have slash-separated options; some do not. Diagnose | |
89583014 | 1714 | an error if options are given for items that don't expect them. |
596875b3 PH |
1715 | */ |
1716 | ||
1717 | uschar *slash = Ustrchr(arg, '/'); | |
55414b25 | 1718 | const uschar *list = arg; |
059ec3d9 | 1719 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); |
89583014 | 1720 | verify_type_t * vp; |
059ec3d9 PH |
1721 | |
1722 | if (ss == NULL) goto BAD_VERIFY; | |
1723 | ||
1724 | /* Handle name/address consistency verification in a separate function. */ | |
1725 | ||
89583014 JH |
1726 | for (vp= verify_type_list; |
1727 | (char *)vp < (char *)verify_type_list + sizeof(verify_type_list); | |
1728 | vp++ | |
1729 | ) | |
1730 | if (vp->alt_opt_sep ? strncmpic(ss, vp->name, vp->alt_opt_sep) == 0 | |
1731 | : strcmpic (ss, vp->name) == 0) | |
1732 | break; | |
1733 | if ((char *)vp >= (char *)verify_type_list + sizeof(verify_type_list)) | |
1734 | goto BAD_VERIFY; | |
1735 | ||
1736 | if (vp->no_options && slash != NULL) | |
059ec3d9 | 1737 | { |
89583014 JH |
1738 | *log_msgptr = string_sprintf("unexpected '/' found in \"%s\" " |
1739 | "(this verify item has no options)", arg); | |
1740 | return ERROR; | |
059ec3d9 | 1741 | } |
89583014 | 1742 | if (!(vp->where_allowed & (1<<where))) |
059ec3d9 | 1743 | { |
89583014 JH |
1744 | *log_msgptr = string_sprintf("cannot verify %s in ACL for %s", vp->name, acl_wherenames[where]); |
1745 | return ERROR; | |
059ec3d9 | 1746 | } |
89583014 | 1747 | switch(vp->value) |
596875b3 | 1748 | { |
89583014 JH |
1749 | case VERIFY_REV_HOST_LKUP: |
1750 | if (sender_host_address == NULL) return OK; | |
7e8360e6 JH |
1751 | if ((rc = acl_verify_reverse(user_msgptr, log_msgptr)) == DEFER) |
1752 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) | |
1753 | if (strcmpic(ss, US"defer_ok") == 0) | |
1754 | return OK; | |
1755 | return rc; | |
059ec3d9 | 1756 | |
89583014 JH |
1757 | case VERIFY_CERT: |
1758 | /* TLS certificate verification is done at STARTTLS time; here we just | |
1759 | test whether it was successful or not. (This is for optional verification; for | |
1760 | mandatory verification, the connection doesn't last this long.) */ | |
e5a9dba6 | 1761 | |
3703d818 JH |
1762 | if (tls_in.certificate_verified) return OK; |
1763 | *user_msgptr = US"no verified certificate"; | |
1764 | return FAIL; | |
e5a9dba6 | 1765 | |
89583014 JH |
1766 | case VERIFY_HELO: |
1767 | /* We can test the result of optional HELO verification that might have | |
1768 | occurred earlier. If not, we can attempt the verification now. */ | |
059ec3d9 | 1769 | |
3703d818 JH |
1770 | if (!helo_verified && !helo_verify_failed) smtp_verify_helo(); |
1771 | return helo_verified? OK : FAIL; | |
059ec3d9 | 1772 | |
89583014 JH |
1773 | case VERIFY_CSA: |
1774 | /* Do Client SMTP Authorization checks in a separate function, and turn the | |
1775 | result code into user-friendly strings. */ | |
1c41c9cc | 1776 | |
3703d818 JH |
1777 | rc = acl_verify_csa(list); |
1778 | *log_msgptr = *user_msgptr = string_sprintf("client SMTP authorization %s", | |
89583014 | 1779 | csa_reason_string[rc]); |
3703d818 JH |
1780 | csa_status = csa_status_string[rc]; |
1781 | DEBUG(D_acl) debug_printf("CSA result %s\n", csa_status); | |
1782 | return csa_return_code[rc]; | |
89583014 JH |
1783 | |
1784 | case VERIFY_HDR_SYNTAX: | |
1785 | /* Check that all relevant header lines have the correct syntax. If there is | |
1786 | a syntax error, we return details of the error to the sender if configured to | |
1787 | send out full details. (But a "message" setting on the ACL can override, as | |
1788 | always). */ | |
1789 | ||
1790 | rc = verify_check_headers(log_msgptr); | |
3703d818 JH |
1791 | if (rc != OK && *log_msgptr) |
1792 | if (smtp_return_error_details) | |
1793 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1794 | else | |
1795 | acl_verify_message = *log_msgptr; | |
89583014 | 1796 | return rc; |
059ec3d9 | 1797 | |
770747fd MFM |
1798 | case VERIFY_HDR_NAMES_ASCII: |
1799 | /* Check that all header names are true 7 bit strings | |
1800 | See RFC 5322, 2.2. and RFC 6532, 3. */ | |
1801 | ||
1802 | rc = verify_check_header_names_ascii(log_msgptr); | |
1803 | if (rc != OK && smtp_return_error_details && *log_msgptr != NULL) | |
1804 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1805 | return rc; | |
1806 | ||
89583014 JH |
1807 | case VERIFY_NOT_BLIND: |
1808 | /* Check that no recipient of this message is "blind", that is, every envelope | |
1809 | recipient must be mentioned in either To: or Cc:. */ | |
059ec3d9 | 1810 | |
89583014 JH |
1811 | rc = verify_check_notblind(); |
1812 | if (rc != OK) | |
1813 | { | |
1814 | *log_msgptr = string_sprintf("bcc recipient detected"); | |
1815 | if (smtp_return_error_details) | |
1816 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); | |
1817 | } | |
1818 | return rc; | |
059ec3d9 | 1819 | |
89583014 JH |
1820 | /* The remaining verification tests check recipient and sender addresses, |
1821 | either from the envelope or from the header. There are a number of | |
1822 | slash-separated options that are common to all of them. */ | |
059ec3d9 | 1823 | |
89583014 JH |
1824 | case VERIFY_HDR_SNDR: |
1825 | verify_header_sender = TRUE; | |
1826 | break; | |
059ec3d9 | 1827 | |
89583014 JH |
1828 | case VERIFY_SNDR: |
1829 | /* In the case of a sender, this can optionally be followed by an address to use | |
1830 | in place of the actual sender (rare special-case requirement). */ | |
059ec3d9 | 1831 | { |
89583014 JH |
1832 | uschar *s = ss + 6; |
1833 | if (*s == 0) | |
1834 | verify_sender_address = sender_address; | |
1835 | else | |
1836 | { | |
1837 | while (isspace(*s)) s++; | |
1838 | if (*s++ != '=') goto BAD_VERIFY; | |
1839 | while (isspace(*s)) s++; | |
1840 | verify_sender_address = string_copy(s); | |
1841 | } | |
059ec3d9 | 1842 | } |
89583014 JH |
1843 | break; |
1844 | ||
1845 | case VERIFY_RCPT: | |
1846 | break; | |
059ec3d9 PH |
1847 | } |
1848 | ||
89583014 JH |
1849 | |
1850 | ||
596875b3 PH |
1851 | /* Remaining items are optional; they apply to sender and recipient |
1852 | verification, including "header sender" verification. */ | |
059ec3d9 PH |
1853 | |
1854 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) | |
1855 | != NULL) | |
1856 | { | |
1857 | if (strcmpic(ss, US"defer_ok") == 0) defer_ok = TRUE; | |
1858 | else if (strcmpic(ss, US"no_details") == 0) no_details = TRUE; | |
eafd343b | 1859 | else if (strcmpic(ss, US"success_on_redirect") == 0) success_on_redirect = TRUE; |
059ec3d9 PH |
1860 | |
1861 | /* These two old options are left for backwards compatibility */ | |
1862 | ||
1863 | else if (strcmpic(ss, US"callout_defer_ok") == 0) | |
1864 | { | |
1865 | callout_defer_ok = TRUE; | |
1866 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1867 | } | |
1868 | ||
1869 | else if (strcmpic(ss, US"check_postmaster") == 0) | |
1870 | { | |
1871 | pm_mailfrom = US""; | |
1872 | if (callout == -1) callout = CALLOUT_TIMEOUT_DEFAULT; | |
1873 | } | |
1874 | ||
1875 | /* The callout option has a number of sub-options, comma separated */ | |
1876 | ||
1877 | else if (strncmpic(ss, US"callout", 7) == 0) | |
1878 | { | |
1879 | callout = CALLOUT_TIMEOUT_DEFAULT; | |
1880 | ss += 7; | |
1881 | if (*ss != 0) | |
1882 | { | |
1883 | while (isspace(*ss)) ss++; | |
1884 | if (*ss++ == '=') | |
1885 | { | |
55414b25 | 1886 | const uschar * sublist = ss; |
059ec3d9 PH |
1887 | int optsep = ','; |
1888 | uschar *opt; | |
1889 | uschar buffer[256]; | |
55414b25 | 1890 | while (isspace(*sublist)) sublist++; |
8e669ac1 | 1891 | |
55414b25 | 1892 | while ((opt = string_nextinlist(&sublist, &optsep, buffer, sizeof(buffer))) |
059ec3d9 PH |
1893 | != NULL) |
1894 | { | |
89583014 | 1895 | callout_opt_t * op; |
438257ba | 1896 | double period = 1.0F; |
059ec3d9 | 1897 | |
89583014 | 1898 | for (op= callout_opt_list; op->name; op++) |
438257ba | 1899 | if (strncmpic(opt, op->name, Ustrlen(op->name)) == 0) |
89583014 | 1900 | break; |
059ec3d9 | 1901 | |
89583014 JH |
1902 | verify_options |= op->flag; |
1903 | if (op->has_option) | |
1904 | { | |
438257ba | 1905 | opt += Ustrlen(op->name); |
4deaf07d PH |
1906 | while (isspace(*opt)) opt++; |
1907 | if (*opt++ != '=') | |
1908 | { | |
1909 | *log_msgptr = string_sprintf("'=' expected after " | |
89583014 | 1910 | "\"%s\" in ACL verify condition \"%s\"", op->name, arg); |
4deaf07d PH |
1911 | return ERROR; |
1912 | } | |
1913 | while (isspace(*opt)) opt++; | |
89583014 JH |
1914 | } |
1915 | if (op->timeval) | |
1916 | { | |
1917 | period = readconf_readtime(opt, 0, FALSE); | |
1918 | if (period < 0) | |
4deaf07d PH |
1919 | { |
1920 | *log_msgptr = string_sprintf("bad time value in ACL condition " | |
1921 | "\"verify %s\"", arg); | |
1922 | return ERROR; | |
1923 | } | |
89583014 JH |
1924 | } |
1925 | ||
1926 | switch(op->value) | |
1927 | { | |
1928 | case CALLOUT_DEFER_OK: callout_defer_ok = TRUE; break; | |
1929 | case CALLOUT_POSTMASTER: pm_mailfrom = US""; break; | |
1930 | case CALLOUT_FULLPOSTMASTER: pm_mailfrom = US""; break; | |
1931 | case CALLOUT_MAILFROM: | |
1932 | if (!verify_header_sender) | |
1933 | { | |
1934 | *log_msgptr = string_sprintf("\"mailfrom\" is allowed as a " | |
1935 | "callout option only for verify=header_sender (detected in ACL " | |
1936 | "condition \"%s\")", arg); | |
1937 | return ERROR; | |
1938 | } | |
1939 | se_mailfrom = string_copy(opt); | |
1940 | break; | |
1941 | case CALLOUT_POSTMASTER_MAILFROM: pm_mailfrom = string_copy(opt); break; | |
1942 | case CALLOUT_MAXWAIT: callout_overall = period; break; | |
1943 | case CALLOUT_CONNECT: callout_connect = period; break; | |
1944 | case CALLOUT_TIME: callout = period; break; | |
1945 | } | |
059ec3d9 PH |
1946 | } |
1947 | } | |
1948 | else | |
1949 | { | |
1950 | *log_msgptr = string_sprintf("'=' expected after \"callout\" in " | |
1951 | "ACL condition \"%s\"", arg); | |
1952 | return ERROR; | |
1953 | } | |
1954 | } | |
1955 | } | |
1956 | ||
1957 | /* Option not recognized */ | |
1958 | ||
1959 | else | |
1960 | { | |
1961 | *log_msgptr = string_sprintf("unknown option \"%s\" in ACL " | |
1962 | "condition \"verify %s\"", ss, arg); | |
1963 | return ERROR; | |
1964 | } | |
1965 | } | |
1966 | ||
1967 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster)) == | |
1968 | (vopt_callout_recipsender|vopt_callout_recippmaster)) | |
1969 | { | |
1970 | *log_msgptr = US"only one of use_sender and use_postmaster can be set " | |
1971 | "for a recipient callout"; | |
1972 | return ERROR; | |
1973 | } | |
1974 | ||
1975 | /* Handle sender-in-header verification. Default the user message to the log | |
1976 | message if giving out verification details. */ | |
1977 | ||
1978 | if (verify_header_sender) | |
1979 | { | |
8e669ac1 | 1980 | int verrno; |
2f682e45 JH |
1981 | |
1982 | if ((rc = verify_check_header_address(user_msgptr, log_msgptr, callout, | |
fe5b5d0b | 1983 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, verify_options, |
2f682e45 | 1984 | &verrno)) != OK) |
8e669ac1 | 1985 | { |
fe5b5d0b PH |
1986 | *basic_errno = verrno; |
1987 | if (smtp_return_error_details) | |
1988 | { | |
2f682e45 | 1989 | if (!*user_msgptr && *log_msgptr) |
fe5b5d0b PH |
1990 | *user_msgptr = string_sprintf("Rejected after DATA: %s", *log_msgptr); |
1991 | if (rc == DEFER) acl_temp_details = TRUE; | |
1992 | } | |
8e669ac1 | 1993 | } |
059ec3d9 PH |
1994 | } |
1995 | ||
1996 | /* Handle a sender address. The default is to verify *the* sender address, but | |
1997 | optionally a different address can be given, for special requirements. If the | |
1998 | address is empty, we are dealing with a bounce message that has no sender, so | |
1999 | we cannot do any checking. If the real sender address gets rewritten during | |
2000 | verification (e.g. DNS widening), set the flag to stop it being rewritten again | |
2001 | during message reception. | |
2002 | ||
2003 | A list of verified "sender" addresses is kept to try to avoid doing to much | |
2004 | work repetitively when there are multiple recipients in a message and they all | |
2005 | require sender verification. However, when callouts are involved, it gets too | |
2006 | complicated because different recipients may require different callout options. | |
2007 | Therefore, we always do a full sender verify when any kind of callout is | |
2008 | specified. Caching elsewhere, for instance in the DNS resolver and in the | |
2009 | callout handling, should ensure that this is not terribly inefficient. */ | |
2010 | ||
2f682e45 | 2011 | else if (verify_sender_address) |
059ec3d9 | 2012 | { |
2f682e45 | 2013 | if ((verify_options & (vopt_callout_recipsender|vopt_callout_recippmaster))) |
059ec3d9 PH |
2014 | { |
2015 | *log_msgptr = US"use_sender or use_postmaster cannot be used for a " | |
2016 | "sender verify callout"; | |
2017 | return ERROR; | |
2018 | } | |
2019 | ||
2020 | sender_vaddr = verify_checked_sender(verify_sender_address); | |
2021 | if (sender_vaddr != NULL && /* Previously checked */ | |
2022 | callout <= 0) /* No callout needed this time */ | |
2023 | { | |
2024 | /* If the "routed" flag is set, it means that routing worked before, so | |
2025 | this check can give OK (the saved return code value, if set, belongs to a | |
2026 | callout that was done previously). If the "routed" flag is not set, routing | |
2027 | must have failed, so we use the saved return code. */ | |
2028 | ||
2f682e45 JH |
2029 | if (testflag(sender_vaddr, af_verify_routed)) |
2030 | rc = OK; | |
2031 | else | |
059ec3d9 PH |
2032 | { |
2033 | rc = sender_vaddr->special_action; | |
2034 | *basic_errno = sender_vaddr->basic_errno; | |
2035 | } | |
2036 | HDEBUG(D_acl) debug_printf("using cached sender verify result\n"); | |
2037 | } | |
2038 | ||
2039 | /* Do a new verification, and cache the result. The cache is used to avoid | |
2040 | verifying the sender multiple times for multiple RCPTs when callouts are not | |
2041 | specified (see comments above). | |
2042 | ||
2043 | The cache is also used on failure to give details in response to the first | |
2044 | RCPT that gets bounced for this reason. However, this can be suppressed by | |
2045 | the no_details option, which sets the flag that says "this detail has already | |
2046 | been sent". The cache normally contains just one address, but there may be | |
2047 | more in esoteric circumstances. */ | |
2048 | ||
2049 | else | |
2050 | { | |
2051 | BOOL routed = TRUE; | |
2a3eea10 | 2052 | uschar *save_address_data = deliver_address_data; |
8e669ac1 | 2053 | |
059ec3d9 | 2054 | sender_vaddr = deliver_make_addr(verify_sender_address, TRUE); |
8c5d388a | 2055 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
2056 | if ((sender_vaddr->prop.utf8_msg = message_smtputf8)) |
2057 | { | |
2058 | sender_vaddr->prop.utf8_downcvt = message_utf8_downconvert == 1; | |
2059 | sender_vaddr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1; | |
2060 | } | |
f358d5e0 | 2061 | #endif |
059ec3d9 PH |
2062 | if (no_details) setflag(sender_vaddr, af_sverify_told); |
2063 | if (verify_sender_address[0] != 0) | |
2064 | { | |
2065 | /* If this is the real sender address, save the unrewritten version | |
2066 | for use later in receive. Otherwise, set a flag so that rewriting the | |
2067 | sender in verify_address() does not update sender_address. */ | |
2068 | ||
2069 | if (verify_sender_address == sender_address) | |
2070 | sender_address_unrewritten = sender_address; | |
2071 | else | |
2072 | verify_options |= vopt_fake_sender; | |
2073 | ||
eafd343b TK |
2074 | if (success_on_redirect) |
2075 | verify_options |= vopt_success_on_redirect; | |
2076 | ||
059ec3d9 PH |
2077 | /* The recipient, qualify, and expn options are never set in |
2078 | verify_options. */ | |
2079 | ||
2080 | rc = verify_address(sender_vaddr, NULL, verify_options, callout, | |
4deaf07d | 2081 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, &routed); |
059ec3d9 PH |
2082 | |
2083 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); | |
2084 | ||
2f682e45 JH |
2085 | if (rc != OK) |
2086 | *basic_errno = sender_vaddr->basic_errno; | |
2087 | else | |
2088 | DEBUG(D_acl) | |
2089 | { | |
2090 | if (Ustrcmp(sender_vaddr->address, verify_sender_address) != 0) | |
2091 | debug_printf("sender %s verified ok as %s\n", | |
2092 | verify_sender_address, sender_vaddr->address); | |
2093 | else | |
2094 | debug_printf("sender %s verified ok\n", | |
2095 | verify_sender_address); | |
2096 | } | |
059ec3d9 | 2097 | } |
2f682e45 JH |
2098 | else |
2099 | rc = OK; /* Null sender */ | |
059ec3d9 PH |
2100 | |
2101 | /* Cache the result code */ | |
2102 | ||
2103 | if (routed) setflag(sender_vaddr, af_verify_routed); | |
2104 | if (callout > 0) setflag(sender_vaddr, af_verify_callout); | |
2105 | sender_vaddr->special_action = rc; | |
2106 | sender_vaddr->next = sender_verified_list; | |
2107 | sender_verified_list = sender_vaddr; | |
8e669ac1 PH |
2108 | |
2109 | /* Restore the recipient address data, which might have been clobbered by | |
2a3eea10 | 2110 | the sender verification. */ |
8e669ac1 | 2111 | |
2a3eea10 | 2112 | deliver_address_data = save_address_data; |
059ec3d9 | 2113 | } |
8e669ac1 | 2114 | |
2a3eea10 PH |
2115 | /* Put the sender address_data value into $sender_address_data */ |
2116 | ||
d43cbe25 | 2117 | sender_address_data = sender_vaddr->prop.address_data; |
059ec3d9 PH |
2118 | } |
2119 | ||
2120 | /* A recipient address just gets a straightforward verify; again we must handle | |
2121 | the DEFER overrides. */ | |
2122 | ||
2123 | else | |
2124 | { | |
2125 | address_item addr2; | |
2126 | ||
eafd343b TK |
2127 | if (success_on_redirect) |
2128 | verify_options |= vopt_success_on_redirect; | |
2129 | ||
059ec3d9 PH |
2130 | /* We must use a copy of the address for verification, because it might |
2131 | get rewritten. */ | |
2132 | ||
2133 | addr2 = *addr; | |
2134 | rc = verify_address(&addr2, NULL, verify_options|vopt_is_recipient, callout, | |
4deaf07d | 2135 | callout_overall, callout_connect, se_mailfrom, pm_mailfrom, NULL); |
059ec3d9 | 2136 | HDEBUG(D_acl) debug_printf("----------- end verify ------------\n"); |
8e669ac1 | 2137 | |
42855d71 | 2138 | *basic_errno = addr2.basic_errno; |
059ec3d9 | 2139 | *log_msgptr = addr2.message; |
8e669ac1 | 2140 | *user_msgptr = (addr2.user_message != NULL)? |
6729cf78 | 2141 | addr2.user_message : addr2.message; |
42855d71 PH |
2142 | |
2143 | /* Allow details for temporary error if the address is so flagged. */ | |
2144 | if (testflag((&addr2), af_pass_message)) acl_temp_details = TRUE; | |
059ec3d9 PH |
2145 | |
2146 | /* Make $address_data visible */ | |
d43cbe25 | 2147 | deliver_address_data = addr2.prop.address_data; |
059ec3d9 PH |
2148 | } |
2149 | ||
2150 | /* We have a result from the relevant test. Handle defer overrides first. */ | |
2151 | ||
2152 | if (rc == DEFER && (defer_ok || | |
2153 | (callout_defer_ok && *basic_errno == ERRNO_CALLOUTDEFER))) | |
2154 | { | |
2155 | HDEBUG(D_acl) debug_printf("verify defer overridden by %s\n", | |
2156 | defer_ok? "defer_ok" : "callout_defer_ok"); | |
2157 | rc = OK; | |
2158 | } | |
2159 | ||
2160 | /* If we've failed a sender, set up a recipient message, and point | |
2161 | sender_verified_failed to the address item that actually failed. */ | |
2162 | ||
2163 | if (rc != OK && verify_sender_address != NULL) | |
2164 | { | |
2165 | if (rc != DEFER) | |
059ec3d9 | 2166 | *log_msgptr = *user_msgptr = US"Sender verify failed"; |
059ec3d9 | 2167 | else if (*basic_errno != ERRNO_CALLOUTDEFER) |
059ec3d9 | 2168 | *log_msgptr = *user_msgptr = US"Could not complete sender verify"; |
059ec3d9 PH |
2169 | else |
2170 | { | |
2171 | *log_msgptr = US"Could not complete sender verify callout"; | |
2172 | *user_msgptr = smtp_return_error_details? sender_vaddr->user_message : | |
2173 | *log_msgptr; | |
2174 | } | |
2175 | ||
2176 | sender_verified_failed = sender_vaddr; | |
2177 | } | |
2178 | ||
2179 | /* Verifying an address messes up the values of $domain and $local_part, | |
2180 | so reset them before returning if this is a RCPT ACL. */ | |
2181 | ||
2182 | if (addr != NULL) | |
2183 | { | |
2184 | deliver_domain = addr->domain; | |
2185 | deliver_localpart = addr->local_part; | |
2186 | } | |
2187 | return rc; | |
2188 | ||
2189 | /* Syntax errors in the verify argument come here. */ | |
2190 | ||
2191 | BAD_VERIFY: | |
2192 | *log_msgptr = string_sprintf("expected \"sender[=address]\", \"recipient\", " | |
770747fd MFM |
2193 | "\"helo\", \"header_syntax\", \"header_sender\", \"header_names_ascii\" " |
2194 | "or \"reverse_host_lookup\" at start of ACL condition " | |
059ec3d9 PH |
2195 | "\"verify %s\"", arg); |
2196 | return ERROR; | |
2197 | } | |
2198 | ||
2199 | ||
2200 | ||
2201 | ||
2202 | /************************************************* | |
2203 | * Check argument for control= modifier * | |
2204 | *************************************************/ | |
2205 | ||
2206 | /* Called from acl_check_condition() below | |
2207 | ||
2208 | Arguments: | |
2209 | arg the argument string for control= | |
2210 | pptr set to point to the terminating character | |
2211 | where which ACL we are in | |
2212 | log_msgptr for error messages | |
2213 | ||
2214 | Returns: CONTROL_xxx value | |
2215 | */ | |
2216 | ||
2217 | static int | |
55414b25 | 2218 | decode_control(const uschar *arg, const uschar **pptr, int where, uschar **log_msgptr) |
059ec3d9 | 2219 | { |
d7bed771 JH |
2220 | int idx, len; |
2221 | control_def * d; | |
059ec3d9 | 2222 | |
d7bed771 JH |
2223 | if ( (idx = find_control(arg, controls_list, nelem(controls_list))) < 0 |
2224 | || ( arg[len = Ustrlen((d = controls_list+idx)->name)] != 0 | |
2225 | && (!d->has_option || arg[len] != '/') | |
2226 | ) ) | |
059ec3d9 PH |
2227 | { |
2228 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
2229 | return CONTROL_ERROR; | |
2230 | } | |
2231 | ||
059ec3d9 | 2232 | *pptr = arg + len; |
d7bed771 | 2233 | return idx; |
059ec3d9 PH |
2234 | } |
2235 | ||
2236 | ||
2237 | ||
c99ce5c9 TF |
2238 | |
2239 | /************************************************* | |
2240 | * Return a ratelimit error * | |
2241 | *************************************************/ | |
2242 | ||
2243 | /* Called from acl_ratelimit() below | |
2244 | ||
2245 | Arguments: | |
2246 | log_msgptr for error messages | |
2247 | format format string | |
2248 | ... supplementary arguments | |
2249 | ss ratelimit option name | |
2250 | where ACL_WHERE_xxxx indicating which ACL this is | |
2251 | ||
2252 | Returns: ERROR | |
2253 | */ | |
2254 | ||
2255 | static int | |
2256 | ratelimit_error(uschar **log_msgptr, const char *format, ...) | |
2257 | { | |
2258 | va_list ap; | |
2259 | uschar buffer[STRING_SPRINTF_BUFFER_SIZE]; | |
2260 | va_start(ap, format); | |
2261 | if (!string_vformat(buffer, sizeof(buffer), format, ap)) | |
2262 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, | |
ef840681 | 2263 | "string_sprintf expansion was longer than " SIZE_T_FMT, sizeof(buffer)); |
c99ce5c9 TF |
2264 | va_end(ap); |
2265 | *log_msgptr = string_sprintf( | |
2266 | "error in arguments to \"ratelimit\" condition: %s", buffer); | |
2267 | return ERROR; | |
2268 | } | |
2269 | ||
2270 | ||
2271 | ||
2272 | ||
870f6ba8 TF |
2273 | /************************************************* |
2274 | * Handle rate limiting * | |
2275 | *************************************************/ | |
2276 | ||
2277 | /* Called by acl_check_condition() below to calculate the result | |
2278 | of the ACL ratelimit condition. | |
2279 | ||
2280 | Note that the return value might be slightly unexpected: if the | |
2281 | sender's rate is above the limit then the result is OK. This is | |
2282 | similar to the dnslists condition, and is so that you can write | |
2283 | ACL clauses like: defer ratelimit = 15 / 1h | |
2284 | ||
2285 | Arguments: | |
2286 | arg the option string for ratelimit= | |
90fc3069 | 2287 | where ACL_WHERE_xxxx indicating which ACL this is |
870f6ba8 TF |
2288 | log_msgptr for error messages |
2289 | ||
2290 | Returns: OK - Sender's rate is above limit | |
2291 | FAIL - Sender's rate is below limit | |
2292 | DEFER - Problem opening ratelimit database | |
2293 | ERROR - Syntax error in options. | |
2294 | */ | |
2295 | ||
2296 | static int | |
55414b25 | 2297 | acl_ratelimit(const uschar *arg, int where, uschar **log_msgptr) |
870f6ba8 | 2298 | { |
c99ce5c9 | 2299 | double limit, period, count; |
8f240103 PH |
2300 | uschar *ss; |
2301 | uschar *key = NULL; | |
c99ce5c9 | 2302 | uschar *unique = NULL; |
870f6ba8 | 2303 | int sep = '/'; |
c99ce5c9 TF |
2304 | BOOL leaky = FALSE, strict = FALSE, readonly = FALSE; |
2305 | BOOL noupdate = FALSE, badacl = FALSE; | |
2306 | int mode = RATE_PER_WHAT; | |
870f6ba8 TF |
2307 | int old_pool, rc; |
2308 | tree_node **anchor, *t; | |
2309 | open_db dbblock, *dbm; | |
c99ce5c9 | 2310 | int dbdb_size; |
870f6ba8 | 2311 | dbdata_ratelimit *dbd; |
c99ce5c9 | 2312 | dbdata_ratelimit_unique *dbdb; |
870f6ba8 TF |
2313 | struct timeval tv; |
2314 | ||
2315 | /* Parse the first two options and record their values in expansion | |
2316 | variables. These variables allow the configuration to have informative | |
2317 | error messages based on rate limits obtained from a table lookup. */ | |
2318 | ||
c99ce5c9 | 2319 | /* First is the maximum number of messages per period / maximum burst |
870f6ba8 TF |
2320 | size, which must be greater than or equal to zero. Zero is useful for |
2321 | rate measurement as opposed to rate limiting. */ | |
2322 | ||
2323 | sender_rate_limit = string_nextinlist(&arg, &sep, NULL, 0); | |
2324 | if (sender_rate_limit == NULL) | |
96f5fe4c JH |
2325 | return ratelimit_error(log_msgptr, "sender rate limit not set"); |
2326 | ||
2327 | limit = Ustrtod(sender_rate_limit, &ss); | |
2328 | if (tolower(*ss) == 'k') { limit *= 1024.0; ss++; } | |
2329 | else if (tolower(*ss) == 'm') { limit *= 1024.0*1024.0; ss++; } | |
2330 | else if (tolower(*ss) == 'g') { limit *= 1024.0*1024.0*1024.0; ss++; } | |
2331 | ||
c99ce5c9 TF |
2332 | if (limit < 0.0 || *ss != '\0') |
2333 | return ratelimit_error(log_msgptr, | |
2334 | "\"%s\" is not a positive number", sender_rate_limit); | |
870f6ba8 | 2335 | |
c99ce5c9 | 2336 | /* Second is the rate measurement period / exponential smoothing time |
870f6ba8 TF |
2337 | constant. This must be strictly greater than zero, because zero leads to |
2338 | run-time division errors. */ | |
2339 | ||
2340 | sender_rate_period = string_nextinlist(&arg, &sep, NULL, 0); | |
2341 | if (sender_rate_period == NULL) period = -1.0; | |
2342 | else period = readconf_readtime(sender_rate_period, 0, FALSE); | |
2343 | if (period <= 0.0) | |
c99ce5c9 TF |
2344 | return ratelimit_error(log_msgptr, |
2345 | "\"%s\" is not a time value", sender_rate_period); | |
2346 | ||
2347 | /* By default we are counting one of something, but the per_rcpt, | |
2348 | per_byte, and count options can change this. */ | |
2349 | ||
2350 | count = 1.0; | |
870f6ba8 | 2351 | |
c99ce5c9 | 2352 | /* Parse the other options. */ |
870f6ba8 TF |
2353 | |
2354 | while ((ss = string_nextinlist(&arg, &sep, big_buffer, big_buffer_size)) | |
2355 | != NULL) | |
2356 | { | |
2357 | if (strcmpic(ss, US"leaky") == 0) leaky = TRUE; | |
2358 | else if (strcmpic(ss, US"strict") == 0) strict = TRUE; | |
8f240103 | 2359 | else if (strcmpic(ss, US"noupdate") == 0) noupdate = TRUE; |
c99ce5c9 TF |
2360 | else if (strcmpic(ss, US"readonly") == 0) readonly = TRUE; |
2361 | else if (strcmpic(ss, US"per_cmd") == 0) RATE_SET(mode, PER_CMD); | |
2362 | else if (strcmpic(ss, US"per_conn") == 0) | |
2363 | { | |
2364 | RATE_SET(mode, PER_CONN); | |
2365 | if (where == ACL_WHERE_NOTSMTP || where == ACL_WHERE_NOTSMTP_START) | |
2366 | badacl = TRUE; | |
2367 | } | |
2368 | else if (strcmpic(ss, US"per_mail") == 0) | |
2369 | { | |
2370 | RATE_SET(mode, PER_MAIL); | |
2371 | if (where > ACL_WHERE_NOTSMTP) badacl = TRUE; | |
2372 | } | |
2373 | else if (strcmpic(ss, US"per_rcpt") == 0) | |
2374 | { | |
2375 | /* If we are running in the RCPT ACL, then we'll count the recipients | |
2376 | one by one, but if we are running when we have accumulated the whole | |
2377 | list then we'll add them all in one batch. */ | |
2378 | if (where == ACL_WHERE_RCPT) | |
2379 | RATE_SET(mode, PER_RCPT); | |
2380 | else if (where >= ACL_WHERE_PREDATA && where <= ACL_WHERE_NOTSMTP) | |
2381 | RATE_SET(mode, PER_ALLRCPTS), count = (double)recipients_count; | |
2382 | else if (where == ACL_WHERE_MAIL || where > ACL_WHERE_NOTSMTP) | |
2383 | RATE_SET(mode, PER_RCPT), badacl = TRUE; | |
2384 | } | |
2385 | else if (strcmpic(ss, US"per_byte") == 0) | |
2386 | { | |
2387 | /* If we have not yet received the message data and there was no SIZE | |
2388 | declaration on the MAIL comand, then it's safe to just use a value of | |
2389 | zero and let the recorded rate decay as if nothing happened. */ | |
2390 | RATE_SET(mode, PER_MAIL); | |
2391 | if (where > ACL_WHERE_NOTSMTP) badacl = TRUE; | |
2392 | else count = message_size < 0 ? 0.0 : (double)message_size; | |
2393 | } | |
2394 | else if (strcmpic(ss, US"per_addr") == 0) | |
2395 | { | |
2396 | RATE_SET(mode, PER_RCPT); | |
438257ba | 2397 | if (where != ACL_WHERE_RCPT) badacl = TRUE, unique = US"*"; |
c99ce5c9 TF |
2398 | else unique = string_sprintf("%s@%s", deliver_localpart, deliver_domain); |
2399 | } | |
2400 | else if (strncmpic(ss, US"count=", 6) == 0) | |
2401 | { | |
2402 | uschar *e; | |
2403 | count = Ustrtod(ss+6, &e); | |
2404 | if (count < 0.0 || *e != '\0') | |
2405 | return ratelimit_error(log_msgptr, | |
2406 | "\"%s\" is not a positive number", ss); | |
2407 | } | |
2408 | else if (strncmpic(ss, US"unique=", 7) == 0) | |
2409 | unique = string_copy(ss + 7); | |
2410 | else if (key == NULL) | |
2411 | key = string_copy(ss); | |
2412 | else | |
2413 | key = string_sprintf("%s/%s", key, ss); | |
870f6ba8 TF |
2414 | } |
2415 | ||
c99ce5c9 TF |
2416 | /* Sanity check. When the badacl flag is set the update mode must either |
2417 | be readonly (which is the default if it is omitted) or, for backwards | |
2418 | compatibility, a combination of noupdate and strict or leaky. */ | |
2419 | ||
2420 | if (mode == RATE_PER_CLASH) | |
2421 | return ratelimit_error(log_msgptr, "conflicting per_* options"); | |
2422 | if (leaky + strict + readonly > 1) | |
2423 | return ratelimit_error(log_msgptr, "conflicting update modes"); | |
2424 | if (badacl && (leaky || strict) && !noupdate) | |
2425 | return ratelimit_error(log_msgptr, | |
2426 | "\"%s\" must not have /leaky or /strict option in %s ACL", | |
2427 | ratelimit_option_string[mode], acl_wherenames[where]); | |
2428 | ||
2429 | /* Set the default values of any unset options. In readonly mode we | |
2430 | perform the rate computation without any increment so that its value | |
2431 | decays to eventually allow over-limit senders through. */ | |
2432 | ||
2433 | if (noupdate) readonly = TRUE, leaky = strict = FALSE; | |
2434 | if (badacl) readonly = TRUE; | |
2435 | if (readonly) count = 0.0; | |
2436 | if (!strict && !readonly) leaky = TRUE; | |
2437 | if (mode == RATE_PER_WHAT) mode = RATE_PER_MAIL; | |
870f6ba8 | 2438 | |
8f240103 PH |
2439 | /* Create the lookup key. If there is no explicit key, use sender_host_address. |
2440 | If there is no sender_host_address (e.g. -bs or acl_not_smtp) then we simply | |
2441 | omit it. The smoothing constant (sender_rate_period) and the per_xxx options | |
2442 | are added to the key because they alter the meaning of the stored data. */ | |
2443 | ||
2444 | if (key == NULL) | |
2445 | key = (sender_host_address == NULL)? US"" : sender_host_address; | |
870f6ba8 | 2446 | |
c99ce5c9 | 2447 | key = string_sprintf("%s/%s/%s%s", |
8f240103 | 2448 | sender_rate_period, |
c99ce5c9 TF |
2449 | ratelimit_option_string[mode], |
2450 | unique == NULL ? "" : "unique/", | |
8f240103 | 2451 | key); |
870f6ba8 | 2452 | |
c99ce5c9 TF |
2453 | HDEBUG(D_acl) |
2454 | debug_printf("ratelimit condition count=%.0f %.1f/%s\n", count, limit, key); | |
870f6ba8 | 2455 | |
8f240103 PH |
2456 | /* See if we have already computed the rate by looking in the relevant tree. |
2457 | For per-connection rate limiting, store tree nodes and dbdata in the permanent | |
c99ce5c9 TF |
2458 | pool so that they survive across resets. In readonly mode we only remember the |
2459 | result for the rest of this command in case a later command changes it. After | |
2460 | this bit of logic the code is independent of the per_* mode. */ | |
870f6ba8 | 2461 | |
870f6ba8 TF |
2462 | old_pool = store_pool; |
2463 | ||
c99ce5c9 TF |
2464 | if (readonly) |
2465 | anchor = &ratelimiters_cmd; | |
2466 | else switch(mode) { | |
2467 | case RATE_PER_CONN: | |
870f6ba8 TF |
2468 | anchor = &ratelimiters_conn; |
2469 | store_pool = POOL_PERM; | |
c99ce5c9 TF |
2470 | break; |
2471 | case RATE_PER_BYTE: | |
2472 | case RATE_PER_MAIL: | |
2473 | case RATE_PER_ALLRCPTS: | |
870f6ba8 | 2474 | anchor = &ratelimiters_mail; |
c99ce5c9 TF |
2475 | break; |
2476 | case RATE_PER_ADDR: | |
2477 | case RATE_PER_CMD: | |
2478 | case RATE_PER_RCPT: | |
fe0dab11 | 2479 | anchor = &ratelimiters_cmd; |
c99ce5c9 TF |
2480 | break; |
2481 | default: | |
3399bb60 | 2482 | anchor = NULL; /* silence an "unused" complaint */ |
c99ce5c9 TF |
2483 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, |
2484 | "internal ACL error: unknown ratelimit mode %d", mode); | |
2485 | break; | |
2486 | } | |
870f6ba8 | 2487 | |
c99ce5c9 TF |
2488 | t = tree_search(*anchor, key); |
2489 | if (t != NULL) | |
870f6ba8 TF |
2490 | { |
2491 | dbd = t->data.ptr; | |
2492 | /* The following few lines duplicate some of the code below. */ | |
8f240103 | 2493 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2494 | store_pool = old_pool; |
2495 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2496 | HDEBUG(D_acl) | |
2497 | debug_printf("ratelimit found pre-computed rate %s\n", sender_rate); | |
2498 | return rc; | |
2499 | } | |
2500 | ||
c99ce5c9 TF |
2501 | /* We aren't using a pre-computed rate, so get a previously recorded rate |
2502 | from the database, which will be updated and written back if required. */ | |
870f6ba8 TF |
2503 | |
2504 | dbm = dbfn_open(US"ratelimit", O_RDWR, &dbblock, TRUE); | |
2505 | if (dbm == NULL) | |
2506 | { | |
2507 | store_pool = old_pool; | |
2508 | sender_rate = NULL; | |
2509 | HDEBUG(D_acl) debug_printf("ratelimit database not available\n"); | |
2510 | *log_msgptr = US"ratelimit database not available"; | |
2511 | return DEFER; | |
2512 | } | |
c99ce5c9 TF |
2513 | dbdb = dbfn_read_with_length(dbm, key, &dbdb_size); |
2514 | dbd = NULL; | |
870f6ba8 TF |
2515 | |
2516 | gettimeofday(&tv, NULL); | |
2517 | ||
c99ce5c9 TF |
2518 | if (dbdb != NULL) |
2519 | { | |
2520 | /* Locate the basic ratelimit block inside the DB data. */ | |
2521 | HDEBUG(D_acl) debug_printf("ratelimit found key in database\n"); | |
2522 | dbd = &dbdb->dbd; | |
2523 | ||
2524 | /* Forget the old Bloom filter if it is too old, so that we count each | |
2525 | repeating event once per period. We don't simply clear and re-use the old | |
2526 | filter because we want its size to change if the limit changes. Note that | |
2527 | we keep the dbd pointer for copying the rate into the new data block. */ | |
2528 | ||
2529 | if(unique != NULL && tv.tv_sec > dbdb->bloom_epoch + period) | |
2530 | { | |
2531 | HDEBUG(D_acl) debug_printf("ratelimit discarding old Bloom filter\n"); | |
2532 | dbdb = NULL; | |
2533 | } | |
2534 | ||
2535 | /* Sanity check. */ | |
2536 | ||
2537 | if(unique != NULL && dbdb_size < sizeof(*dbdb)) | |
2538 | { | |
2539 | HDEBUG(D_acl) debug_printf("ratelimit discarding undersize Bloom filter\n"); | |
2540 | dbdb = NULL; | |
2541 | } | |
2542 | } | |
2543 | ||
2544 | /* Allocate a new data block if the database lookup failed | |
2545 | or the Bloom filter passed its age limit. */ | |
2546 | ||
2547 | if (dbdb == NULL) | |
2548 | { | |
2549 | if (unique == NULL) | |
2550 | { | |
2551 | /* No Bloom filter. This basic ratelimit block is initialized below. */ | |
2552 | HDEBUG(D_acl) debug_printf("ratelimit creating new rate data block\n"); | |
2553 | dbdb_size = sizeof(*dbd); | |
2554 | dbdb = store_get(dbdb_size); | |
2555 | } | |
2556 | else | |
2557 | { | |
2558 | int extra; | |
2559 | HDEBUG(D_acl) debug_printf("ratelimit creating new Bloom filter\n"); | |
2560 | ||
2561 | /* See the long comment below for an explanation of the magic number 2. | |
2562 | The filter has a minimum size in case the rate limit is very small; | |
2563 | this is determined by the definition of dbdata_ratelimit_unique. */ | |
2564 | ||
2565 | extra = (int)limit * 2 - sizeof(dbdb->bloom); | |
2566 | if (extra < 0) extra = 0; | |
2567 | dbdb_size = sizeof(*dbdb) + extra; | |
2568 | dbdb = store_get(dbdb_size); | |
2569 | dbdb->bloom_epoch = tv.tv_sec; | |
2570 | dbdb->bloom_size = sizeof(dbdb->bloom) + extra; | |
2571 | memset(dbdb->bloom, 0, dbdb->bloom_size); | |
2572 | ||
2573 | /* Preserve any basic ratelimit data (which is our longer-term memory) | |
2574 | by copying it from the discarded block. */ | |
2575 | ||
2576 | if (dbd != NULL) | |
2577 | { | |
2578 | dbdb->dbd = *dbd; | |
2579 | dbd = &dbdb->dbd; | |
2580 | } | |
2581 | } | |
2582 | } | |
2583 | ||
2584 | /* If we are counting unique events, find out if this event is new or not. | |
2585 | If the client repeats the event during the current period then it should be | |
2586 | counted. We skip this code in readonly mode for efficiency, because any | |
2587 | changes to the filter will be discarded and because count is already set to | |
2588 | zero. */ | |
2589 | ||
2590 | if (unique != NULL && !readonly) | |
2591 | { | |
2592 | /* We identify unique events using a Bloom filter. (You can find my | |
2593 | notes on Bloom filters at http://fanf.livejournal.com/81696.html) | |
2594 | With the per_addr option, an "event" is a recipient address, though the | |
2595 | user can use the unique option to define their own events. We only count | |
2596 | an event if we have not seen it before. | |
2597 | ||
2598 | We size the filter according to the rate limit, which (in leaky mode) | |
2599 | is the limit on the population of the filter. We allow 16 bits of space | |
2600 | per entry (see the construction code above) and we set (up to) 8 of them | |
2601 | when inserting an element (see the loop below). The probability of a false | |
2602 | positive (an event we have not seen before but which we fail to count) is | |
2603 | ||
2604 | size = limit * 16 | |
2605 | numhash = 8 | |
2606 | allzero = exp(-numhash * pop / size) | |
2607 | = exp(-0.5 * pop / limit) | |
2608 | fpr = pow(1 - allzero, numhash) | |
2609 | ||
2610 | For senders at the limit the fpr is 0.06% or 1 in 1700 | |
2611 | and for senders at half the limit it is 0.0006% or 1 in 170000 | |
2612 | ||
2613 | In strict mode the Bloom filter can fill up beyond the normal limit, in | |
2614 | which case the false positive rate will rise. This means that the | |
2615 | measured rate for very fast senders can bogusly drop off after a while. | |
2616 | ||
2617 | At twice the limit, the fpr is 2.5% or 1 in 40 | |
2618 | At four times the limit, it is 31% or 1 in 3.2 | |
2619 | ||
2620 | It takes ln(pop/limit) periods for an over-limit burst of pop events to | |
2621 | decay below the limit, and if this is more than one then the Bloom filter | |
2622 | will be discarded before the decay gets that far. The false positive rate | |
2623 | at this threshold is 9.3% or 1 in 10.7. */ | |
2624 | ||
2625 | BOOL seen; | |
2626 | unsigned n, hash, hinc; | |
2627 | uschar md5sum[16]; | |
2628 | md5 md5info; | |
2629 | ||
2630 | /* Instead of using eight independent hash values, we combine two values | |
2631 | using the formula h1 + n * h2. This does not harm the Bloom filter's | |
2632 | performance, and means the amount of hash we need is independent of the | |
2633 | number of bits we set in the filter. */ | |
2634 | ||
2635 | md5_start(&md5info); | |
2636 | md5_end(&md5info, unique, Ustrlen(unique), md5sum); | |
2637 | hash = md5sum[0] | md5sum[1] << 8 | md5sum[2] << 16 | md5sum[3] << 24; | |
2638 | hinc = md5sum[4] | md5sum[5] << 8 | md5sum[6] << 16 | md5sum[7] << 24; | |
2639 | ||
2640 | /* Scan the bits corresponding to this event. A zero bit means we have | |
2641 | not seen it before. Ensure all bits are set to record this event. */ | |
2642 | ||
2643 | HDEBUG(D_acl) debug_printf("ratelimit checking uniqueness of %s\n", unique); | |
2644 | ||
2645 | seen = TRUE; | |
2646 | for (n = 0; n < 8; n++, hash += hinc) | |
2647 | { | |
2648 | int bit = 1 << (hash % 8); | |
2649 | int byte = (hash / 8) % dbdb->bloom_size; | |
2650 | if ((dbdb->bloom[byte] & bit) == 0) | |
2651 | { | |
2652 | dbdb->bloom[byte] |= bit; | |
2653 | seen = FALSE; | |
2654 | } | |
2655 | } | |
2656 | ||
2657 | /* If this event has occurred before, do not count it. */ | |
2658 | ||
2659 | if (seen) | |
2660 | { | |
2661 | HDEBUG(D_acl) debug_printf("ratelimit event found in Bloom filter\n"); | |
2662 | count = 0.0; | |
2663 | } | |
2664 | else | |
2665 | HDEBUG(D_acl) debug_printf("ratelimit event added to Bloom filter\n"); | |
2666 | } | |
2667 | ||
2668 | /* If there was no previous ratelimit data block for this key, initialize | |
2669 | the new one, otherwise update the block from the database. The initial rate | |
2670 | is what would be computed by the code below for an infinite interval. */ | |
2671 | ||
870f6ba8 TF |
2672 | if (dbd == NULL) |
2673 | { | |
c99ce5c9 TF |
2674 | HDEBUG(D_acl) debug_printf("ratelimit initializing new key's rate data\n"); |
2675 | dbd = &dbdb->dbd; | |
870f6ba8 TF |
2676 | dbd->time_stamp = tv.tv_sec; |
2677 | dbd->time_usec = tv.tv_usec; | |
c99ce5c9 | 2678 | dbd->rate = count; |
870f6ba8 TF |
2679 | } |
2680 | else | |
2681 | { | |
2682 | /* The smoothed rate is computed using an exponentially weighted moving | |
2683 | average adjusted for variable sampling intervals. The standard EWMA for | |
2684 | a fixed sampling interval is: f'(t) = (1 - a) * f(t) + a * f'(t - 1) | |
2685 | where f() is the measured value and f'() is the smoothed value. | |
2686 | ||
2687 | Old data decays out of the smoothed value exponentially, such that data n | |
2688 | samples old is multiplied by a^n. The exponential decay time constant p | |
2689 | is defined such that data p samples old is multiplied by 1/e, which means | |
2690 | that a = exp(-1/p). We can maintain the same time constant for a variable | |
2691 | sampling interval i by using a = exp(-i/p). | |
2692 | ||
2693 | The rate we are measuring is messages per period, suitable for directly | |
2694 | comparing with the limit. The average rate between now and the previous | |
2695 | message is period / interval, which we feed into the EWMA as the sample. | |
2696 | ||
2697 | It turns out that the number of messages required for the smoothed rate | |
2698 | to reach the limit when they are sent in a burst is equal to the limit. | |
2699 | This can be seen by analysing the value of the smoothed rate after N | |
2700 | messages sent at even intervals. Let k = (1 - a) * p/i | |
2701 | ||
2702 | rate_1 = (1 - a) * p/i + a * rate_0 | |
2703 | = k + a * rate_0 | |
2704 | rate_2 = k + a * rate_1 | |
2705 | = k + a * k + a^2 * rate_0 | |
2706 | rate_3 = k + a * k + a^2 * k + a^3 * rate_0 | |
2707 | rate_N = rate_0 * a^N + k * SUM(x=0..N-1)(a^x) | |
2708 | = rate_0 * a^N + k * (1 - a^N) / (1 - a) | |
2709 | = rate_0 * a^N + p/i * (1 - a^N) | |
2710 | ||
2711 | When N is large, a^N -> 0 so rate_N -> p/i as desired. | |
2712 | ||
2713 | rate_N = p/i + (rate_0 - p/i) * a^N | |
2714 | a^N = (rate_N - p/i) / (rate_0 - p/i) | |
2715 | N * -i/p = log((rate_N - p/i) / (rate_0 - p/i)) | |
2716 | N = p/i * log((rate_0 - p/i) / (rate_N - p/i)) | |
2717 | ||
2718 | Numerical analysis of the above equation, setting the computed rate to | |
2719 | increase from rate_0 = 0 to rate_N = limit, shows that for large sending | |
2720 | rates, p/i, the number of messages N = limit. So limit serves as both the | |
2721 | maximum rate measured in messages per period, and the maximum number of | |
2722 | messages that can be sent in a fast burst. */ | |
2723 | ||
2724 | double this_time = (double)tv.tv_sec | |
2725 | + (double)tv.tv_usec / 1000000.0; | |
2726 | double prev_time = (double)dbd->time_stamp | |
2727 | + (double)dbd->time_usec / 1000000.0; | |
870f6ba8 TF |
2728 | |
2729 | /* We must avoid division by zero, and deal gracefully with the clock going | |
2730 | backwards. If we blunder ahead when time is in reverse then the computed | |
e5d5a95f | 2731 | rate will be bogus. To be safe we clamp interval to a very small number. */ |
870f6ba8 | 2732 | |
e5d5a95f TF |
2733 | double interval = this_time - prev_time <= 0.0 ? 1e-9 |
2734 | : this_time - prev_time; | |
2735 | ||
2736 | double i_over_p = interval / period; | |
2737 | double a = exp(-i_over_p); | |
870f6ba8 | 2738 | |
c99ce5c9 TF |
2739 | /* Combine the instantaneous rate (period / interval) with the previous rate |
2740 | using the smoothing factor a. In order to measure sized events, multiply the | |
2741 | instantaneous rate by the count of bytes or recipients etc. */ | |
2742 | ||
870f6ba8 TF |
2743 | dbd->time_stamp = tv.tv_sec; |
2744 | dbd->time_usec = tv.tv_usec; | |
c99ce5c9 TF |
2745 | dbd->rate = (1 - a) * count / i_over_p + a * dbd->rate; |
2746 | ||
2747 | /* When events are very widely spaced the computed rate tends towards zero. | |
2748 | Although this is accurate it turns out not to be useful for our purposes, | |
2749 | especially when the first event after a long silence is the start of a spam | |
2750 | run. A more useful model is that the rate for an isolated event should be the | |
2751 | size of the event per the period size, ignoring the lack of events outside | |
2752 | the current period and regardless of where the event falls in the period. So, | |
2753 | if the interval was so long that the calculated rate is unhelpfully small, we | |
2754 | re-intialize the rate. In the absence of higher-rate bursts, the condition | |
2755 | below is true if the interval is greater than the period. */ | |
2756 | ||
2757 | if (dbd->rate < count) dbd->rate = count; | |
870f6ba8 TF |
2758 | } |
2759 | ||
c99ce5c9 TF |
2760 | /* Clients sending at the limit are considered to be over the limit. |
2761 | This matters for edge cases such as a limit of zero, when the client | |
2762 | should be completely blocked. */ | |
3348576f | 2763 | |
8f240103 | 2764 | rc = (dbd->rate < limit)? FAIL : OK; |
870f6ba8 TF |
2765 | |
2766 | /* Update the state if the rate is low or if we are being strict. If we | |
2767 | are in leaky mode and the sender's rate is too high, we do not update | |
2768 | the recorded rate in order to avoid an over-aggressive sender's retry | |
c99ce5c9 TF |
2769 | rate preventing them from getting any email through. If readonly is set, |
2770 | neither leaky nor strict are set, so we do not do any updates. */ | |
870f6ba8 | 2771 | |
c99ce5c9 | 2772 | if ((rc == FAIL && leaky) || strict) |
8f240103 | 2773 | { |
c99ce5c9 | 2774 | dbfn_write(dbm, key, dbdb, dbdb_size); |
8f240103 PH |
2775 | HDEBUG(D_acl) debug_printf("ratelimit db updated\n"); |
2776 | } | |
2777 | else | |
2778 | { | |
2779 | HDEBUG(D_acl) debug_printf("ratelimit db not updated: %s\n", | |
c99ce5c9 | 2780 | readonly? "readonly mode" : "over the limit, but leaky"); |
8f240103 PH |
2781 | } |
2782 | ||
870f6ba8 TF |
2783 | dbfn_close(dbm); |
2784 | ||
c99ce5c9 | 2785 | /* Store the result in the tree for future reference. */ |
870f6ba8 | 2786 | |
c99ce5c9 TF |
2787 | t = store_get(sizeof(tree_node) + Ustrlen(key)); |
2788 | t->data.ptr = dbd; | |
2789 | Ustrcpy(t->name, key); | |
2790 | (void)tree_insertnode(anchor, t); | |
870f6ba8 TF |
2791 | |
2792 | /* We create the formatted version of the sender's rate very late in | |
2793 | order to ensure that it is done using the correct storage pool. */ | |
2794 | ||
2795 | store_pool = old_pool; | |
2796 | sender_rate = string_sprintf("%.1f", dbd->rate); | |
2797 | ||
2798 | HDEBUG(D_acl) | |
2799 | debug_printf("ratelimit computed rate %s\n", sender_rate); | |
2800 | ||
2801 | return rc; | |
2802 | } | |
2803 | ||
2804 | ||
2805 | ||
b0019c78 TF |
2806 | /************************************************* |
2807 | * The udpsend ACL modifier * | |
2808 | *************************************************/ | |
2809 | ||
2810 | /* Called by acl_check_condition() below. | |
2811 | ||
2812 | Arguments: | |
2813 | arg the option string for udpsend= | |
2814 | log_msgptr for error messages | |
2815 | ||
2816 | Returns: OK - Completed. | |
2817 | DEFER - Problem with DNS lookup. | |
2818 | ERROR - Syntax error in options. | |
2819 | */ | |
2820 | ||
2821 | static int | |
55414b25 | 2822 | acl_udpsend(const uschar *arg, uschar **log_msgptr) |
b0019c78 TF |
2823 | { |
2824 | int sep = 0; | |
2825 | uschar *hostname; | |
2826 | uschar *portstr; | |
2827 | uschar *portend; | |
2828 | host_item *h; | |
2829 | int portnum; | |
b0019c78 TF |
2830 | int len; |
2831 | int r, s; | |
b1f8e4f8 | 2832 | uschar * errstr; |
b0019c78 TF |
2833 | |
2834 | hostname = string_nextinlist(&arg, &sep, NULL, 0); | |
2835 | portstr = string_nextinlist(&arg, &sep, NULL, 0); | |
2836 | ||
2837 | if (hostname == NULL) | |
2838 | { | |
217b0e56 | 2839 | *log_msgptr = US"missing destination host in \"udpsend\" modifier"; |
b0019c78 TF |
2840 | return ERROR; |
2841 | } | |
2842 | if (portstr == NULL) | |
2843 | { | |
217b0e56 | 2844 | *log_msgptr = US"missing destination port in \"udpsend\" modifier"; |
b0019c78 TF |
2845 | return ERROR; |
2846 | } | |
2847 | if (arg == NULL) | |
2848 | { | |
217b0e56 | 2849 | *log_msgptr = US"missing datagram payload in \"udpsend\" modifier"; |
b0019c78 TF |
2850 | return ERROR; |
2851 | } | |
2852 | portnum = Ustrtol(portstr, &portend, 10); | |
2853 | if (*portend != '\0') | |
2854 | { | |
217b0e56 | 2855 | *log_msgptr = US"bad destination port in \"udpsend\" modifier"; |
b0019c78 TF |
2856 | return ERROR; |
2857 | } | |
2858 | ||
2859 | /* Make a single-item host list. */ | |
2860 | h = store_get(sizeof(host_item)); | |
2861 | memset(h, 0, sizeof(host_item)); | |
2862 | h->name = hostname; | |
2863 | h->port = portnum; | |
2864 | h->mx = MX_NONE; | |
2865 | ||
2866 | if (string_is_ip_address(hostname, NULL)) | |
2867 | h->address = hostname, r = HOST_FOUND; | |
2868 | else | |
2869 | r = host_find_byname(h, NULL, 0, NULL, FALSE); | |
2870 | if (r == HOST_FIND_FAILED || r == HOST_FIND_AGAIN) | |
2871 | { | |
217b0e56 | 2872 | *log_msgptr = US"DNS lookup failed in \"udpsend\" modifier"; |
b0019c78 TF |
2873 | return DEFER; |
2874 | } | |
2875 | ||
2876 | HDEBUG(D_acl) | |
2877 | debug_printf("udpsend [%s]:%d %s\n", h->address, portnum, arg); | |
2878 | ||
b1f8e4f8 JH |
2879 | r = s = ip_connectedsocket(SOCK_DGRAM, h->address, portnum, portnum, |
2880 | 1, NULL, &errstr); | |
b0019c78 | 2881 | if (r < 0) goto defer; |
27f9999e | 2882 | len = Ustrlen(arg); |
9cb1785a | 2883 | r = send(s, arg, len, 0); |
b1f8e4f8 JH |
2884 | if (r < 0) |
2885 | { | |
2886 | errstr = US strerror(errno); | |
2887 | close(s); | |
2888 | goto defer; | |
2889 | } | |
2890 | close(s); | |
b0019c78 TF |
2891 | if (r < len) |
2892 | { | |
2893 | *log_msgptr = | |
2894 | string_sprintf("\"udpsend\" truncated from %d to %d octets", len, r); | |
2895 | return DEFER; | |
2896 | } | |
2897 | ||
2898 | HDEBUG(D_acl) | |
2899 | debug_printf("udpsend %d bytes\n", r); | |
2900 | ||
2901 | return OK; | |
2902 | ||
2903 | defer: | |
b1f8e4f8 | 2904 | *log_msgptr = string_sprintf("\"udpsend\" failed: %s", errstr); |
b0019c78 TF |
2905 | return DEFER; |
2906 | } | |
2907 | ||
2908 | ||
2909 | ||
059ec3d9 PH |
2910 | /************************************************* |
2911 | * Handle conditions/modifiers on an ACL item * | |
2912 | *************************************************/ | |
2913 | ||
2914 | /* Called from acl_check() below. | |
2915 | ||
2916 | Arguments: | |
2917 | verb ACL verb | |
2918 | cb ACL condition block - if NULL, result is OK | |
2919 | where where called from | |
2920 | addr the address being checked for RCPT, or NULL | |
2921 | level the nesting level | |
2922 | epp pointer to pass back TRUE if "endpass" encountered | |
2923 | (applies only to "accept" and "discard") | |
2924 | user_msgptr user message pointer | |
2925 | log_msgptr log message pointer | |
2926 | basic_errno pointer to where to put verify error | |
2927 | ||
2928 | Returns: OK - all conditions are met | |
2929 | DISCARD - an "acl" condition returned DISCARD - only allowed | |
2930 | for "accept" or "discard" verbs | |
2931 | FAIL - at least one condition fails | |
2932 | FAIL_DROP - an "acl" condition returned FAIL_DROP | |
2933 | DEFER - can't tell at the moment (typically, lookup defer, | |
2934 | but can be temporary callout problem) | |
2935 | ERROR - ERROR from nested ACL or expansion failure or other | |
2936 | error | |
2937 | */ | |
2938 | ||
2939 | static int | |
2940 | acl_check_condition(int verb, acl_condition_block *cb, int where, | |
2941 | address_item *addr, int level, BOOL *epp, uschar **user_msgptr, | |
2942 | uschar **log_msgptr, int *basic_errno) | |
2943 | { | |
2944 | uschar *user_message = NULL; | |
2945 | uschar *log_message = NULL; | |
059ec3d9 | 2946 | int rc = OK; |
8523533c | 2947 | #ifdef WITH_CONTENT_SCAN |
0f0c8159 | 2948 | int sep = -'/'; |
8523533c | 2949 | #endif |
059ec3d9 PH |
2950 | |
2951 | for (; cb != NULL; cb = cb->next) | |
2952 | { | |
55414b25 | 2953 | const uschar *arg; |
8e669ac1 | 2954 | int control_type; |
059ec3d9 PH |
2955 | |
2956 | /* The message and log_message items set up messages to be used in | |
2957 | case of rejection. They are expanded later. */ | |
2958 | ||
2959 | if (cb->type == ACLC_MESSAGE) | |
2960 | { | |
187bc588 | 2961 | HDEBUG(D_acl) debug_printf(" message: %s\n", cb->arg); |
059ec3d9 PH |
2962 | user_message = cb->arg; |
2963 | continue; | |
2964 | } | |
2965 | ||
2966 | if (cb->type == ACLC_LOG_MESSAGE) | |
2967 | { | |
187bc588 | 2968 | HDEBUG(D_acl) debug_printf("l_message: %s\n", cb->arg); |
059ec3d9 PH |
2969 | log_message = cb->arg; |
2970 | continue; | |
2971 | } | |
2972 | ||
2973 | /* The endpass "condition" just sets a flag to show it occurred. This is | |
2974 | checked at compile time to be on an "accept" or "discard" item. */ | |
2975 | ||
2976 | if (cb->type == ACLC_ENDPASS) | |
2977 | { | |
2978 | *epp = TRUE; | |
2979 | continue; | |
2980 | } | |
2981 | ||
2982 | /* For other conditions and modifiers, the argument is expanded now for some | |
2983 | of them, but not for all, because expansion happens down in some lower level | |
2984 | checking functions in some cases. */ | |
2985 | ||
2986 | if (cond_expand_at_top[cb->type]) | |
2987 | { | |
2988 | arg = expand_string(cb->arg); | |
2989 | if (arg == NULL) | |
2990 | { | |
2991 | if (expand_string_forcedfail) continue; | |
2992 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
2993 | cb->arg, expand_string_message); | |
2994 | return search_find_defer? DEFER : ERROR; | |
2995 | } | |
2996 | } | |
2997 | else arg = cb->arg; | |
2998 | ||
2999 | /* Show condition, and expanded condition if it's different */ | |
3000 | ||
3001 | HDEBUG(D_acl) | |
3002 | { | |
3003 | int lhswidth = 0; | |
3004 | debug_printf("check %s%s %n", | |
3005 | (!cond_modifiers[cb->type] && cb->u.negated)? "!":"", | |
3006 | conditions[cb->type], &lhswidth); | |
3007 | ||
3008 | if (cb->type == ACLC_SET) | |
3009 | { | |
38a0a95f PH |
3010 | debug_printf("acl_%s ", cb->u.varname); |
3011 | lhswidth += 5 + Ustrlen(cb->u.varname); | |
059ec3d9 PH |
3012 | } |
3013 | ||
3014 | debug_printf("= %s\n", cb->arg); | |
3015 | ||
3016 | if (arg != cb->arg) | |
3017 | debug_printf("%.*s= %s\n", lhswidth, | |
3018 | US" ", CS arg); | |
3019 | } | |
3020 | ||
3021 | /* Check that this condition makes sense at this time */ | |
3022 | ||
3023 | if ((cond_forbids[cb->type] & (1 << where)) != 0) | |
3024 | { | |
3025 | *log_msgptr = string_sprintf("cannot %s %s condition in %s ACL", | |
3026 | cond_modifiers[cb->type]? "use" : "test", | |
3027 | conditions[cb->type], acl_wherenames[where]); | |
3028 | return ERROR; | |
3029 | } | |
3030 | ||
3031 | /* Run the appropriate test for each condition, or take the appropriate | |
3032 | action for the remaining modifiers. */ | |
3033 | ||
3034 | switch(cb->type) | |
3035 | { | |
71fafd95 PH |
3036 | case ACLC_ADD_HEADER: |
3037 | setup_header(arg); | |
3038 | break; | |
3039 | ||
059ec3d9 PH |
3040 | /* A nested ACL that returns "discard" makes sense only for an "accept" or |
3041 | "discard" verb. */ | |
71fafd95 | 3042 | |
059ec3d9 | 3043 | case ACLC_ACL: |
f60d98e8 | 3044 | rc = acl_check_wargs(where, addr, arg, level+1, user_msgptr, log_msgptr); |
7421ecab JH |
3045 | if (rc == DISCARD && verb != ACL_ACCEPT && verb != ACL_DISCARD) |
3046 | { | |
3047 | *log_msgptr = string_sprintf("nested ACL returned \"discard\" for " | |
3048 | "\"%s\" command (only allowed with \"accept\" or \"discard\")", | |
3049 | verbs[verb]); | |
3050 | return ERROR; | |
3051 | } | |
059ec3d9 PH |
3052 | break; |
3053 | ||
3054 | case ACLC_AUTHENTICATED: | |
3055 | rc = (sender_host_authenticated == NULL)? FAIL : | |
3056 | match_isinlist(sender_host_authenticated, &arg, 0, NULL, NULL, MCL_STRING, | |
3057 | TRUE, NULL); | |
3058 | break; | |
3059 | ||
71fafd95 | 3060 | #ifdef EXPERIMENTAL_BRIGHTMAIL |
8523533c TK |
3061 | case ACLC_BMI_OPTIN: |
3062 | { | |
3063 | int old_pool = store_pool; | |
3064 | store_pool = POOL_PERM; | |
3065 | bmi_current_optin = string_copy(arg); | |
3066 | store_pool = old_pool; | |
3067 | } | |
3068 | break; | |
71fafd95 | 3069 | #endif |
8523533c | 3070 | |
059ec3d9 | 3071 | case ACLC_CONDITION: |
f3766eb5 NM |
3072 | /* The true/false parsing here should be kept in sync with that used in |
3073 | expand.c when dealing with ECOND_BOOL so that we don't have too many | |
3074 | different definitions of what can be a boolean. */ | |
51c7471d JH |
3075 | if (*arg == '-' |
3076 | ? Ustrspn(arg+1, "0123456789") == Ustrlen(arg+1) /* Negative number */ | |
3077 | : Ustrspn(arg, "0123456789") == Ustrlen(arg)) /* Digits, or empty */ | |
059ec3d9 PH |
3078 | rc = (Uatoi(arg) == 0)? FAIL : OK; |
3079 | else | |
3080 | rc = (strcmpic(arg, US"no") == 0 || | |
3081 | strcmpic(arg, US"false") == 0)? FAIL : | |
3082 | (strcmpic(arg, US"yes") == 0 || | |
3083 | strcmpic(arg, US"true") == 0)? OK : DEFER; | |
3084 | if (rc == DEFER) | |
3085 | *log_msgptr = string_sprintf("invalid \"condition\" value \"%s\"", arg); | |
3086 | break; | |
3087 | ||
c3611384 PH |
3088 | case ACLC_CONTINUE: /* Always succeeds */ |
3089 | break; | |
3090 | ||
059ec3d9 | 3091 | case ACLC_CONTROL: |
c5fcb476 | 3092 | { |
55414b25 JH |
3093 | const uschar *p = NULL; |
3094 | control_type = decode_control(arg, &p, where, log_msgptr); | |
4840604e | 3095 | |
55414b25 | 3096 | /* Check if this control makes sense at this time */ |
f7572e5a | 3097 | |
d7bed771 | 3098 | if (controls_list[control_type].forbids & (1 << where)) |
55414b25 JH |
3099 | { |
3100 | *log_msgptr = string_sprintf("cannot use \"control=%s\" in %s ACL", | |
d7bed771 | 3101 | controls_list[control_type].name, acl_wherenames[where]); |
55414b25 JH |
3102 | return ERROR; |
3103 | } | |
8800895a | 3104 | |
55414b25 JH |
3105 | switch(control_type) |
3106 | { | |
3107 | case CONTROL_AUTH_UNADVERTISED: | |
3108 | allow_auth_unadvertised = TRUE; | |
3109 | break; | |
3110 | ||
3111 | #ifdef EXPERIMENTAL_BRIGHTMAIL | |
3112 | case CONTROL_BMI_RUN: | |
3113 | bmi_run = 1; | |
3114 | break; | |
3115 | #endif | |
3116 | ||
3117 | #ifndef DISABLE_DKIM | |
3118 | case CONTROL_DKIM_VERIFY: | |
3119 | dkim_disable_verify = TRUE; | |
3120 | #ifdef EXPERIMENTAL_DMARC | |
3121 | /* Since DKIM was blocked, skip DMARC too */ | |
3122 | dmarc_disable_verify = TRUE; | |
3123 | dmarc_enable_forensic = FALSE; | |
3124 | #endif | |
3125 | break; | |
3126 | #endif | |
3127 | ||
3128 | #ifdef EXPERIMENTAL_DMARC | |
3129 | case CONTROL_DMARC_VERIFY: | |
3130 | dmarc_disable_verify = TRUE; | |
3131 | break; | |
3132 | ||
3133 | case CONTROL_DMARC_FORENSIC: | |
3134 | dmarc_enable_forensic = TRUE; | |
3135 | break; | |
3136 | #endif | |
3137 | ||
3138 | case CONTROL_DSCP: | |
3139 | if (*p == '/') | |
3140 | { | |
3141 | int fd, af, level, optname, value; | |
3142 | /* If we are acting on stdin, the setsockopt may fail if stdin is not | |
3143 | a socket; we can accept that, we'll just debug-log failures anyway. */ | |
3144 | fd = fileno(smtp_in); | |
3145 | af = ip_get_address_family(fd); | |
3146 | if (af < 0) | |
3147 | { | |
3148 | HDEBUG(D_acl) | |
3149 | debug_printf("smtp input is probably not a socket [%s], not setting DSCP\n", | |
3150 | strerror(errno)); | |
3151 | break; | |
3152 | } | |
3153 | if (dscp_lookup(p+1, af, &level, &optname, &value)) | |
3154 | { | |
3155 | if (setsockopt(fd, level, optname, &value, sizeof(value)) < 0) | |
3156 | { | |
3157 | HDEBUG(D_acl) debug_printf("failed to set input DSCP[%s]: %s\n", | |
3158 | p+1, strerror(errno)); | |
3159 | } | |
3160 | else | |
3161 | { | |
3162 | HDEBUG(D_acl) debug_printf("set input DSCP to \"%s\"\n", p+1); | |
3163 | } | |
3164 | } | |
3165 | else | |
3166 | { | |
3167 | *log_msgptr = string_sprintf("unrecognised DSCP value in \"control=%s\"", arg); | |
3168 | return ERROR; | |
3169 | } | |
3170 | } | |
3171 | else | |
3172 | { | |
3173 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3174 | return ERROR; | |
3175 | } | |
3176 | break; | |
3177 | ||
3178 | case CONTROL_ERROR: | |
3179 | return ERROR; | |
3180 | ||
3181 | case CONTROL_CASEFUL_LOCAL_PART: | |
3182 | deliver_localpart = addr->cc_local_part; | |
3183 | break; | |
3184 | ||
3185 | case CONTROL_CASELOWER_LOCAL_PART: | |
3186 | deliver_localpart = addr->lc_local_part; | |
3187 | break; | |
3188 | ||
3189 | case CONTROL_ENFORCE_SYNC: | |
3190 | smtp_enforce_sync = TRUE; | |
3191 | break; | |
3192 | ||
3193 | case CONTROL_NO_ENFORCE_SYNC: | |
3194 | smtp_enforce_sync = FALSE; | |
3195 | break; | |
3196 | ||
3197 | #ifdef WITH_CONTENT_SCAN | |
3198 | case CONTROL_NO_MBOX_UNSPOOL: | |
3199 | no_mbox_unspool = TRUE; | |
3200 | break; | |
3201 | #endif | |
3202 | ||
3203 | case CONTROL_NO_MULTILINE: | |
3204 | no_multiline_responses = TRUE; | |
3205 | break; | |
3206 | ||
3207 | case CONTROL_NO_PIPELINING: | |
3208 | pipelining_enable = FALSE; | |
3209 | break; | |
3210 | ||
3211 | case CONTROL_NO_DELAY_FLUSH: | |
3212 | disable_delay_flush = TRUE; | |
3213 | break; | |
3214 | ||
3215 | case CONTROL_NO_CALLOUT_FLUSH: | |
3216 | disable_callout_flush = TRUE; | |
3217 | break; | |
3218 | ||
3219 | case CONTROL_FAKEREJECT: | |
3220 | cancel_cutthrough_connection("fakereject"); | |
3221 | case CONTROL_FAKEDEFER: | |
3222 | fake_response = (control_type == CONTROL_FAKEDEFER) ? DEFER : FAIL; | |
3223 | if (*p == '/') | |
3224 | { | |
3225 | const uschar *pp = p + 1; | |
3226 | while (*pp != 0) pp++; | |
3227 | fake_response_text = expand_string(string_copyn(p+1, pp-p-1)); | |
3228 | p = pp; | |
3229 | } | |
3230 | else | |
3231 | { | |
3232 | /* Explicitly reset to default string */ | |
3233 | 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)."; | |
3234 | } | |
3235 | break; | |
ed7f7860 | 3236 | |
55414b25 JH |
3237 | case CONTROL_FREEZE: |
3238 | deliver_freeze = TRUE; | |
3239 | deliver_frozen_at = time(NULL); | |
3240 | freeze_tell = freeze_tell_config; /* Reset to configured value */ | |
3241 | if (Ustrncmp(p, "/no_tell", 8) == 0) | |
3242 | { | |
3243 | p += 8; | |
3244 | freeze_tell = NULL; | |
3245 | } | |
3246 | if (*p != 0) | |
3247 | { | |
3248 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3249 | return ERROR; | |
3250 | } | |
3251 | cancel_cutthrough_connection("item frozen"); | |
3252 | break; | |
3253 | ||
3254 | case CONTROL_QUEUE_ONLY: | |
3255 | queue_only_policy = TRUE; | |
3256 | cancel_cutthrough_connection("queueing forced"); | |
3257 | break; | |
3258 | ||
3259 | case CONTROL_SUBMISSION: | |
3260 | originator_name = US""; | |
3261 | submission_mode = TRUE; | |
3262 | while (*p == '/') | |
3263 | { | |
3264 | if (Ustrncmp(p, "/sender_retain", 14) == 0) | |
3265 | { | |
3266 | p += 14; | |
3267 | active_local_sender_retain = TRUE; | |
3268 | active_local_from_check = FALSE; | |
3269 | } | |
3270 | else if (Ustrncmp(p, "/domain=", 8) == 0) | |
3271 | { | |
3272 | const uschar *pp = p + 8; | |
3273 | while (*pp != 0 && *pp != '/') pp++; | |
3274 | submission_domain = string_copyn(p+8, pp-p-8); | |
3275 | p = pp; | |
3276 | } | |
3277 | /* The name= option must be last, because it swallows the rest of | |
3278 | the string. */ | |
3279 | else if (Ustrncmp(p, "/name=", 6) == 0) | |
3280 | { | |
3281 | const uschar *pp = p + 6; | |
3282 | while (*pp != 0) pp++; | |
3283 | submission_name = string_copy(parse_fix_phrase(p+6, pp-p-6, | |
3284 | big_buffer, big_buffer_size)); | |
3285 | p = pp; | |
3286 | } | |
3287 | else break; | |
3288 | } | |
3289 | if (*p != 0) | |
3290 | { | |
3291 | *log_msgptr = string_sprintf("syntax error in \"control=%s\"", arg); | |
3292 | return ERROR; | |
3293 | } | |
3294 | break; | |
e4bdf652 | 3295 | |
55414b25 | 3296 | case CONTROL_DEBUG: |
55414b25 | 3297 | { |
b0d68adc JH |
3298 | uschar * debug_tag = NULL; |
3299 | uschar * debug_opts = NULL; | |
3300 | BOOL kill = FALSE; | |
3301 | ||
3302 | while (*p == '/') | |
55414b25 | 3303 | { |
b0d68adc JH |
3304 | const uschar * pp = p+1; |
3305 | if (Ustrncmp(pp, "tag=", 4) == 0) | |
3306 | { | |
3307 | for (pp += 4; *pp && *pp != '/';) pp++; | |
3308 | debug_tag = string_copyn(p+5, pp-p-5); | |
3309 | } | |
3310 | else if (Ustrncmp(pp, "opts=", 5) == 0) | |
3311 | { | |
3312 | for (pp += 5; *pp && *pp != '/';) pp++; | |
3313 | debug_opts = string_copyn(p+6, pp-p-6); | |
3314 | } | |
3315 | else if (Ustrncmp(pp, "kill", 4) == 0) | |
3316 | { | |
3317 | for (pp += 4; *pp && *pp != '/';) pp++; | |
3318 | kill = TRUE; | |
3319 | } | |
3320 | else | |
3321 | while (*pp && *pp != '/') pp++; | |
55414b25 JH |
3322 | p = pp; |
3323 | } | |
b0d68adc JH |
3324 | |
3325 | if (kill) | |
3326 | debug_logging_stop(); | |
3327 | else | |
3328 | debug_logging_activate(debug_tag, debug_opts); | |
55414b25 | 3329 | } |
55414b25 JH |
3330 | break; |
3331 | ||
3332 | case CONTROL_SUPPRESS_LOCAL_FIXUPS: | |
3333 | suppress_local_fixups = TRUE; | |
3334 | break; | |
3335 | ||
3336 | case CONTROL_CUTTHROUGH_DELIVERY: | |
a2b89db1 | 3337 | #ifndef DISABLE_PRDR |
55414b25 | 3338 | if (prdr_requested) |
a2b89db1 PP |
3339 | #else |
3340 | if (0) | |
3341 | #endif | |
55414b25 JH |
3342 | /* Too hard to think about for now. We might in future cutthrough |
3343 | the case where both sides handle prdr and this-node prdr acl | |
3344 | is "accept" */ | |
93a6fce2 | 3345 | *log_msgptr = string_sprintf("PRDR on %s reception\n", arg); |
5032d1cf JH |
3346 | else |
3347 | { | |
55414b25 JH |
3348 | if (deliver_freeze) |
3349 | *log_msgptr = US"frozen"; | |
3350 | else if (queue_only_policy) | |
3351 | *log_msgptr = US"queue-only"; | |
3352 | else if (fake_response == FAIL) | |
3353 | *log_msgptr = US"fakereject"; | |
3354 | else | |
3355 | { | |
ff5929e3 JH |
3356 | if (rcpt_count == 1) |
3357 | { | |
3358 | cutthrough.delivery = TRUE; | |
3359 | while (*p == '/') | |
3360 | { | |
3361 | const uschar * pp = p+1; | |
3362 | if (Ustrncmp(pp, "defer=", 6) == 0) | |
3363 | { | |
3364 | pp += 6; | |
3365 | if (Ustrncmp(pp, "pass", 4) == 0) cutthrough.defer_pass = TRUE; | |
3366 | /* else if (Ustrncmp(pp, "spool") == 0) ; default */ | |
3367 | } | |
3368 | else | |
3369 | while (*pp && *pp != '/') pp++; | |
3370 | p = pp; | |
3371 | } | |
3372 | } | |
55414b25 JH |
3373 | break; |
3374 | } | |
3375 | *log_msgptr = string_sprintf("\"control=%s\" on %s item", | |
3376 | arg, *log_msgptr); | |
5032d1cf | 3377 | } |
55414b25 | 3378 | return ERROR; |
3c8b3577 | 3379 | |
8c5d388a | 3380 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
3381 | case CONTROL_UTF8_DOWNCONVERT: |
3382 | if (*p == '/') | |
3383 | { | |
921dfc11 JH |
3384 | if (p[1] == '1') |
3385 | { | |
3386 | message_utf8_downconvert = 1; | |
3387 | addr->prop.utf8_downcvt = TRUE; | |
3388 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3389 | p += 2; | |
3390 | break; | |
3391 | } | |
3392 | if (p[1] == '0') | |
3393 | { | |
3394 | message_utf8_downconvert = 0; | |
3395 | addr->prop.utf8_downcvt = FALSE; | |
3396 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3397 | p += 2; | |
3398 | break; | |
3399 | } | |
3c8b3577 | 3400 | if (p[1] == '-' && p[2] == '1') |
921dfc11 JH |
3401 | { |
3402 | message_utf8_downconvert = -1; | |
3403 | addr->prop.utf8_downcvt = FALSE; | |
3404 | addr->prop.utf8_downcvt_maybe = TRUE; | |
3405 | p += 3; | |
3406 | break; | |
3407 | } | |
3c8b3577 JH |
3408 | *log_msgptr = US"bad option value for control=utf8_downconvert"; |
3409 | } | |
3410 | else | |
3411 | { | |
921dfc11 JH |
3412 | message_utf8_downconvert = 1; |
3413 | addr->prop.utf8_downcvt = TRUE; | |
3414 | addr->prop.utf8_downcvt_maybe = FALSE; | |
3415 | break; | |
3c8b3577 JH |
3416 | } |
3417 | return ERROR; | |
8c5d388a | 3418 | #endif |
3c8b3577 | 3419 | |
9171d434 | 3420 | } |
55414b25 | 3421 | break; |
059ec3d9 | 3422 | } |
059ec3d9 | 3423 | |
6a8f9482 TK |
3424 | #ifdef EXPERIMENTAL_DCC |
3425 | case ACLC_DCC: | |
3426 | { | |
3427 | /* Seperate the regular expression and any optional parameters. */ | |
55414b25 JH |
3428 | const uschar * list = arg; |
3429 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
6a8f9482 TK |
3430 | /* Run the dcc backend. */ |
3431 | rc = dcc_process(&ss); | |
3432 | /* Modify return code based upon the existance of options. */ | |
3c8b3577 | 3433 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size))) |
6a8f9482 | 3434 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) |
3c8b3577 | 3435 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ |
6a8f9482 TK |
3436 | } |
3437 | break; | |
3438 | #endif | |
3439 | ||
71fafd95 | 3440 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3441 | case ACLC_DECODE: |
3442 | rc = mime_decode(&arg); | |
3443 | break; | |
71fafd95 | 3444 | #endif |
8523533c | 3445 | |
059ec3d9 PH |
3446 | case ACLC_DELAY: |
3447 | { | |
3448 | int delay = readconf_readtime(arg, 0, FALSE); | |
3449 | if (delay < 0) | |
3450 | { | |
3451 | *log_msgptr = string_sprintf("syntax error in argument for \"delay\" " | |
3452 | "modifier: \"%s\" is not a time value", arg); | |
3453 | return ERROR; | |
3454 | } | |
3455 | else | |
3456 | { | |
3457 | HDEBUG(D_acl) debug_printf("delay modifier requests %d-second delay\n", | |
3458 | delay); | |
3459 | if (host_checking) | |
3460 | { | |
3461 | HDEBUG(D_acl) | |
3462 | debug_printf("delay skipped in -bh checking mode\n"); | |
3463 | } | |
010c2d14 | 3464 | |
ae9d18bc JH |
3465 | /* NOTE 1: Remember that we may be |
3466 | dealing with stdin/stdout here, in addition to TCP/IP connections. | |
3467 | Also, delays may be specified for non-SMTP input, where smtp_out and | |
3468 | smtp_in will be NULL. Whatever is done must work in all cases. | |
3469 | ||
3470 | NOTE 2: The added feature of flushing the output before a delay must | |
3471 | apply only to SMTP input. Hence the test for smtp_out being non-NULL. | |
3472 | */ | |
3473 | ||
3474 | else | |
3475 | { | |
3476 | if (smtp_out != NULL && !disable_delay_flush) | |
3477 | mac_smtp_fflush(); | |
3478 | ||
861a7c51 | 3479 | #if !defined(NO_POLL_H) && defined (POLLRDHUP) |
ae9d18bc JH |
3480 | { |
3481 | struct pollfd p; | |
3482 | nfds_t n = 0; | |
3483 | if (smtp_out) | |
3484 | { | |
3485 | p.fd = fileno(smtp_out); | |
3486 | p.events = POLLRDHUP; | |
3487 | n = 1; | |
3488 | } | |
3489 | if (poll(&p, n, delay*1000) > 0) | |
3490 | HDEBUG(D_acl) debug_printf("delay cancelled by peer close\n"); | |
3491 | } | |
3492 | #else | |
010c2d14 PH |
3493 | /* It appears to be impossible to detect that a TCP/IP connection has |
3494 | gone away without reading from it. This means that we cannot shorten | |
3495 | the delay below if the client goes away, because we cannot discover | |
3496 | that the client has closed its end of the connection. (The connection | |
3497 | is actually in a half-closed state, waiting for the server to close its | |
3498 | end.) It would be nice to be able to detect this state, so that the | |
3499 | Exim process is not held up unnecessarily. However, it seems that we | |
3500 | can't. The poll() function does not do the right thing, and in any case | |
3501 | it is not always available. | |
047bdd8c | 3502 | */ |
010c2d14 | 3503 | |
86b8287f | 3504 | while (delay > 0) delay = sleep(delay); |
ae9d18bc | 3505 | #endif |
8e669ac1 | 3506 | } |
059ec3d9 PH |
3507 | } |
3508 | } | |
3509 | break; | |
3510 | ||
80a47a2c TK |
3511 | #ifndef DISABLE_DKIM |
3512 | case ACLC_DKIM_SIGNER: | |
9e5d6b55 TK |
3513 | if (dkim_cur_signer != NULL) |
3514 | rc = match_isinlist(dkim_cur_signer, | |
80a47a2c | 3515 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); |
80a47a2c | 3516 | else |
b0b9dbb1 | 3517 | rc = FAIL; |
71fafd95 PH |
3518 | break; |
3519 | ||
80a47a2c TK |
3520 | case ACLC_DKIM_STATUS: |
3521 | rc = match_isinlist(dkim_exim_expand_query(DKIM_VERIFY_STATUS), | |
3522 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); | |
71fafd95 PH |
3523 | break; |
3524 | #endif | |
fb2274d4 | 3525 | |
4840604e TL |
3526 | #ifdef EXPERIMENTAL_DMARC |
3527 | case ACLC_DMARC_STATUS: | |
4a8ce2d8 | 3528 | if (!dmarc_has_been_checked) |
4840604e | 3529 | dmarc_process(); |
4a8ce2d8 | 3530 | dmarc_has_been_checked = TRUE; |
4840604e TL |
3531 | /* used long way of dmarc_exim_expand_query() in case we need more |
3532 | * view into the process in the future. */ | |
3533 | rc = match_isinlist(dmarc_exim_expand_query(DMARC_VERIFY_STATUS), | |
3534 | &arg,0,NULL,NULL,MCL_STRING,TRUE,NULL); | |
3535 | break; | |
3536 | #endif | |
3537 | ||
059ec3d9 | 3538 | case ACLC_DNSLISTS: |
379ba7d0 | 3539 | rc = verify_check_dnsbl(where, &arg, log_msgptr); |
059ec3d9 PH |
3540 | break; |
3541 | ||
3542 | case ACLC_DOMAINS: | |
3543 | rc = match_isinlist(addr->domain, &arg, 0, &domainlist_anchor, | |
55414b25 | 3544 | addr->domain_cache, MCL_DOMAIN, TRUE, CUSS &deliver_domain_data); |
059ec3d9 PH |
3545 | break; |
3546 | ||
3547 | /* The value in tls_cipher is the full cipher name, for example, | |
3548 | TLSv1:DES-CBC3-SHA:168, whereas the values to test for are just the | |
3549 | cipher names such as DES-CBC3-SHA. But program defensively. We don't know | |
3550 | what may in practice come out of the SSL library - which at the time of | |
3551 | writing is poorly documented. */ | |
3552 | ||
3553 | case ACLC_ENCRYPTED: | |
817d9f57 | 3554 | if (tls_in.cipher == NULL) rc = FAIL; else |
059ec3d9 PH |
3555 | { |
3556 | uschar *endcipher = NULL; | |
817d9f57 JH |
3557 | uschar *cipher = Ustrchr(tls_in.cipher, ':'); |
3558 | if (cipher == NULL) cipher = tls_in.cipher; else | |
059ec3d9 PH |
3559 | { |
3560 | endcipher = Ustrchr(++cipher, ':'); | |
3561 | if (endcipher != NULL) *endcipher = 0; | |
3562 | } | |
3563 | rc = match_isinlist(cipher, &arg, 0, NULL, NULL, MCL_STRING, TRUE, NULL); | |
3564 | if (endcipher != NULL) *endcipher = ':'; | |
3565 | } | |
3566 | break; | |
3567 | ||
3568 | /* Use verify_check_this_host() instead of verify_check_host() so that | |
3569 | we can pass over &host_data to catch any looked up data. Once it has been | |
3570 | set, it retains its value so that it's still there if another ACL verb | |
3571 | comes through here and uses the cache. However, we must put it into | |
3572 | permanent store in case it is also expected to be used in a subsequent | |
3573 | message in the same SMTP connection. */ | |
3574 | ||
3575 | case ACLC_HOSTS: | |
3576 | rc = verify_check_this_host(&arg, sender_host_cache, NULL, | |
55414b25 JH |
3577 | (sender_host_address == NULL)? US"" : sender_host_address, |
3578 | CUSS &host_data); | |
4a452c43 JH |
3579 | if (rc == DEFER) *log_msgptr = search_error_message; |
3580 | if (host_data) host_data = string_copy_malloc(host_data); | |
059ec3d9 PH |
3581 | break; |
3582 | ||
3583 | case ACLC_LOCAL_PARTS: | |
3584 | rc = match_isinlist(addr->cc_local_part, &arg, 0, | |
3585 | &localpartlist_anchor, addr->localpart_cache, MCL_LOCALPART, TRUE, | |
55414b25 | 3586 | CUSS &deliver_localpart_data); |
059ec3d9 PH |
3587 | break; |
3588 | ||
6ea85e9a PH |
3589 | case ACLC_LOG_REJECT_TARGET: |
3590 | { | |
3591 | int logbits = 0; | |
3592 | int sep = 0; | |
55414b25 | 3593 | const uschar *s = arg; |
6ea85e9a | 3594 | uschar *ss; |
4a452c43 | 3595 | while ((ss = string_nextinlist(&s, &sep, big_buffer, big_buffer_size))) |
6ea85e9a PH |
3596 | { |
3597 | if (Ustrcmp(ss, "main") == 0) logbits |= LOG_MAIN; | |
3598 | else if (Ustrcmp(ss, "panic") == 0) logbits |= LOG_PANIC; | |
3599 | else if (Ustrcmp(ss, "reject") == 0) logbits |= LOG_REJECT; | |
3600 | else | |
3601 | { | |
3602 | logbits |= LOG_MAIN|LOG_REJECT; | |
3603 | log_write(0, LOG_MAIN|LOG_PANIC, "unknown log name \"%s\" in " | |
3604 | "\"log_reject_target\" in %s ACL", ss, acl_wherenames[where]); | |
3605 | } | |
3606 | } | |
3607 | log_reject_target = logbits; | |
3608 | } | |
3609 | break; | |
3610 | ||
059ec3d9 PH |
3611 | case ACLC_LOGWRITE: |
3612 | { | |
3613 | int logbits = 0; | |
55414b25 | 3614 | const uschar *s = arg; |
059ec3d9 PH |
3615 | if (*s == ':') |
3616 | { | |
3617 | s++; | |
3618 | while (*s != ':') | |
3619 | { | |
3620 | if (Ustrncmp(s, "main", 4) == 0) | |
3621 | { logbits |= LOG_MAIN; s += 4; } | |
3622 | else if (Ustrncmp(s, "panic", 5) == 0) | |
3623 | { logbits |= LOG_PANIC; s += 5; } | |
3624 | else if (Ustrncmp(s, "reject", 6) == 0) | |
3625 | { logbits |= LOG_REJECT; s += 6; } | |
3626 | else | |
3627 | { | |
3628 | logbits = LOG_MAIN|LOG_PANIC; | |
3629 | s = string_sprintf(":unknown log name in \"%s\" in " | |
3630 | "\"logwrite\" in %s ACL", arg, acl_wherenames[where]); | |
3631 | } | |
3632 | if (*s == ',') s++; | |
3633 | } | |
3634 | s++; | |
3635 | } | |
3636 | while (isspace(*s)) s++; | |
6ea85e9a PH |
3637 | |
3638 | ||
059ec3d9 PH |
3639 | if (logbits == 0) logbits = LOG_MAIN; |
3640 | log_write(0, logbits, "%s", string_printing(s)); | |
3641 | } | |
3642 | break; | |
8e669ac1 | 3643 | |
71fafd95 | 3644 | #ifdef WITH_CONTENT_SCAN |
0f0c8159 | 3645 | case ACLC_MALWARE: /* Run the malware backend. */ |
8523533c | 3646 | { |
6ea85e9a | 3647 | /* Separate the regular expression and any optional parameters. */ |
55414b25 JH |
3648 | const uschar * list = arg; |
3649 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
0f0c8159 JH |
3650 | uschar *opt; |
3651 | BOOL defer_ok = FALSE; | |
3652 | int timeout = 0; | |
3653 | ||
55414b25 | 3654 | while ((opt = string_nextinlist(&list, &sep, NULL, 0))) |
0f0c8159 JH |
3655 | if (strcmpic(opt, US"defer_ok") == 0) |
3656 | defer_ok = TRUE; | |
3657 | else if ( strncmpic(opt, US"tmo=", 4) == 0 | |
3658 | && (timeout = readconf_readtime(opt+4, '\0', FALSE)) < 0 | |
3659 | ) | |
3660 | { | |
3661 | *log_msgptr = string_sprintf("bad timeout value in '%s'", opt); | |
3662 | return ERROR; | |
3663 | } | |
3664 | ||
3665 | rc = malware(ss, timeout); | |
3666 | if (rc == DEFER && defer_ok) | |
3667 | rc = FAIL; /* FAIL so that the message is passed to the next ACL */ | |
8523533c TK |
3668 | } |
3669 | break; | |
3670 | ||
3671 | case ACLC_MIME_REGEX: | |
71fafd95 | 3672 | rc = mime_regex(&arg); |
8523533c | 3673 | break; |
71fafd95 | 3674 | #endif |
059ec3d9 | 3675 | |
b0b9dbb1 JH |
3676 | case ACLC_QUEUE: |
3677 | queue_name = string_copy_malloc(arg); | |
3678 | break; | |
3679 | ||
870f6ba8 | 3680 | case ACLC_RATELIMIT: |
90fc3069 | 3681 | rc = acl_ratelimit(arg, where, log_msgptr); |
870f6ba8 TF |
3682 | break; |
3683 | ||
059ec3d9 | 3684 | case ACLC_RECIPIENTS: |
55414b25 JH |
3685 | rc = match_address_list((const uschar *)addr->address, TRUE, TRUE, &arg, NULL, -1, 0, |
3686 | CUSS &recipient_data); | |
059ec3d9 PH |
3687 | break; |
3688 | ||
71fafd95 PH |
3689 | #ifdef WITH_CONTENT_SCAN |
3690 | case ACLC_REGEX: | |
3691 | rc = regex(&arg); | |
8523533c | 3692 | break; |
71fafd95 | 3693 | #endif |
8523533c | 3694 | |
e7568d51 TL |
3695 | case ACLC_REMOVE_HEADER: |
3696 | setup_remove_header(arg); | |
3697 | break; | |
3698 | ||
059ec3d9 PH |
3699 | case ACLC_SENDER_DOMAINS: |
3700 | { | |
3701 | uschar *sdomain; | |
3702 | sdomain = Ustrrchr(sender_address, '@'); | |
3703 | sdomain = (sdomain == NULL)? US"" : sdomain + 1; | |
3704 | rc = match_isinlist(sdomain, &arg, 0, &domainlist_anchor, | |
3705 | sender_domain_cache, MCL_DOMAIN, TRUE, NULL); | |
3706 | } | |
3707 | break; | |
3708 | ||
3709 | case ACLC_SENDERS: | |
55414b25 JH |
3710 | rc = match_address_list((const uschar *)sender_address, TRUE, TRUE, &arg, |
3711 | sender_address_cache, -1, 0, CUSS &sender_data); | |
059ec3d9 PH |
3712 | break; |
3713 | ||
3714 | /* Connection variables must persist forever */ | |
3715 | ||
3716 | case ACLC_SET: | |
3717 | { | |
3718 | int old_pool = store_pool; | |
5ef5dd52 | 3719 | if ( cb->u.varname[0] == 'c' |
0cbf2b82 | 3720 | #ifndef DISABLE_EVENT |
5ef5dd52 JB |
3721 | || event_name /* An event is being delivered */ |
3722 | #endif | |
3723 | ) | |
3724 | store_pool = POOL_PERM; | |
38a0a95f | 3725 | acl_var_create(cb->u.varname)->data.ptr = string_copy(arg); |
059ec3d9 PH |
3726 | store_pool = old_pool; |
3727 | } | |
3728 | break; | |
3729 | ||
71fafd95 | 3730 | #ifdef WITH_CONTENT_SCAN |
8523533c TK |
3731 | case ACLC_SPAM: |
3732 | { | |
3733 | /* Seperate the regular expression and any optional parameters. */ | |
55414b25 JH |
3734 | const uschar * list = arg; |
3735 | uschar *ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size); | |
8523533c | 3736 | /* Run the spam backend. */ |
55414b25 | 3737 | rc = spam(CUSS &ss); |
8523533c | 3738 | /* Modify return code based upon the existance of options. */ |
55414b25 | 3739 | while ((ss = string_nextinlist(&list, &sep, big_buffer, big_buffer_size)) |
8523533c TK |
3740 | != NULL) { |
3741 | if (strcmpic(ss, US"defer_ok") == 0 && rc == DEFER) | |
3742 | { | |
3743 | /* FAIL so that the message is passed to the next ACL */ | |
3744 | rc = FAIL; | |
3745 | } | |
3746 | } | |
3747 | } | |
3748 | break; | |
71fafd95 | 3749 | #endif |
8523533c | 3750 | |
71fafd95 | 3751 | #ifdef EXPERIMENTAL_SPF |
8523533c | 3752 | case ACLC_SPF: |
65a7d8c3 NM |
3753 | rc = spf_process(&arg, sender_address, SPF_PROCESS_NORMAL); |
3754 | break; | |
3755 | case ACLC_SPF_GUESS: | |
3756 | rc = spf_process(&arg, sender_address, SPF_PROCESS_GUESS); | |
8523533c | 3757 | break; |
71fafd95 | 3758 | #endif |
8523533c | 3759 | |
b0019c78 TF |
3760 | case ACLC_UDPSEND: |
3761 | rc = acl_udpsend(arg, log_msgptr); | |
3762 | break; | |
3763 | ||
059ec3d9 PH |
3764 | /* If the verb is WARN, discard any user message from verification, because |
3765 | such messages are SMTP responses, not header additions. The latter come | |
475fe28a PH |
3766 | only from explicit "message" modifiers. However, put the user message into |
3767 | $acl_verify_message so it can be used in subsequent conditions or modifiers | |
3768 | (until something changes it). */ | |
059ec3d9 PH |
3769 | |
3770 | case ACLC_VERIFY: | |
3771 | rc = acl_verify(where, addr, arg, user_msgptr, log_msgptr, basic_errno); | |
3703d818 JH |
3772 | if (*user_msgptr) |
3773 | acl_verify_message = *user_msgptr; | |
059ec3d9 PH |
3774 | if (verb == ACL_WARN) *user_msgptr = NULL; |
3775 | break; | |
3776 | ||
3777 | default: | |
3778 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown " | |
3779 | "condition %d", cb->type); | |
3780 | break; | |
3781 | } | |
3782 | ||
3783 | /* If a condition was negated, invert OK/FAIL. */ | |
3784 | ||
3785 | if (!cond_modifiers[cb->type] && cb->u.negated) | |
3786 | { | |
3787 | if (rc == OK) rc = FAIL; | |
3788 | else if (rc == FAIL || rc == FAIL_DROP) rc = OK; | |
3789 | } | |
3790 | ||
3791 | if (rc != OK) break; /* Conditions loop */ | |
3792 | } | |
3793 | ||
3794 | ||
3795 | /* If the result is the one for which "message" and/or "log_message" are used, | |
4e88a19f PH |
3796 | handle the values of these modifiers. If there isn't a log message set, we make |
3797 | it the same as the user message. | |
059ec3d9 PH |
3798 | |
3799 | "message" is a user message that will be included in an SMTP response. Unless | |
3800 | it is empty, it overrides any previously set user message. | |
3801 | ||
3802 | "log_message" is a non-user message, and it adds to any existing non-user | |
3803 | message that is already set. | |
3804 | ||
4e88a19f PH |
3805 | Most verbs have but a single return for which the messages are relevant, but |
3806 | for "discard", it's useful to have the log message both when it succeeds and | |
3807 | when it fails. For "accept", the message is used in the OK case if there is no | |
3808 | "endpass", but (for backwards compatibility) in the FAIL case if "endpass" is | |
3809 | present. */ | |
059ec3d9 | 3810 | |
4e88a19f PH |
3811 | if (*epp && rc == OK) user_message = NULL; |
3812 | ||
3813 | if (((1<<rc) & msgcond[verb]) != 0) | |
059ec3d9 PH |
3814 | { |
3815 | uschar *expmessage; | |
4e88a19f PH |
3816 | uschar *old_user_msgptr = *user_msgptr; |
3817 | uschar *old_log_msgptr = (*log_msgptr != NULL)? *log_msgptr : old_user_msgptr; | |
059ec3d9 PH |
3818 | |
3819 | /* If the verb is "warn", messages generated by conditions (verification or | |
4e88a19f PH |
3820 | nested ACLs) are always discarded. This also happens for acceptance verbs |
3821 | when they actually do accept. Only messages specified at this level are used. | |
059ec3d9 PH |
3822 | However, the value of an existing message is available in $acl_verify_message |
3823 | during expansions. */ | |
3824 | ||
4e88a19f PH |
3825 | if (verb == ACL_WARN || |
3826 | (rc == OK && (verb == ACL_ACCEPT || verb == ACL_DISCARD))) | |
3827 | *log_msgptr = *user_msgptr = NULL; | |
059ec3d9 PH |
3828 | |
3829 | if (user_message != NULL) | |
3830 | { | |
3831 | acl_verify_message = old_user_msgptr; | |
3832 | expmessage = expand_string(user_message); | |
3833 | if (expmessage == NULL) | |
3834 | { | |
3835 | if (!expand_string_forcedfail) | |
3836 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3837 | user_message, expand_string_message); | |
3838 | } | |
3839 | else if (expmessage[0] != 0) *user_msgptr = expmessage; | |
3840 | } | |
3841 | ||
3842 | if (log_message != NULL) | |
3843 | { | |
3844 | acl_verify_message = old_log_msgptr; | |
3845 | expmessage = expand_string(log_message); | |
3846 | if (expmessage == NULL) | |
3847 | { | |
3848 | if (!expand_string_forcedfail) | |
3849 | log_write(0, LOG_MAIN|LOG_PANIC, "failed to expand ACL message \"%s\": %s", | |
3850 | log_message, expand_string_message); | |
3851 | } | |
3852 | else if (expmessage[0] != 0) | |
3853 | { | |
3854 | *log_msgptr = (*log_msgptr == NULL)? expmessage : | |
3855 | string_sprintf("%s: %s", expmessage, *log_msgptr); | |
3856 | } | |
3857 | } | |
3858 | ||
3859 | /* If no log message, default it to the user message */ | |
3860 | ||
3861 | if (*log_msgptr == NULL) *log_msgptr = *user_msgptr; | |
3862 | } | |
3863 | ||
3864 | acl_verify_message = NULL; | |
3865 | return rc; | |
3866 | } | |
3867 | ||
3868 | ||
3869 | ||
3870 | ||
3871 | ||
3872 | /************************************************* | |
3873 | * Get line from a literal ACL * | |
3874 | *************************************************/ | |
3875 | ||
3876 | /* This function is passed to acl_read() in order to extract individual lines | |
3877 | of a literal ACL, which we access via static pointers. We can destroy the | |
3878 | contents because this is called only once (the compiled ACL is remembered). | |
3879 | ||
3880 | This code is intended to treat the data in the same way as lines in the main | |
3881 | Exim configuration file. That is: | |
3882 | ||
3883 | . Leading spaces are ignored. | |
3884 | ||
3885 | . A \ at the end of a line is a continuation - trailing spaces after the \ | |
3886 | are permitted (this is because I don't believe in making invisible things | |
3887 | significant). Leading spaces on the continued part of a line are ignored. | |
3888 | ||
3889 | . Physical lines starting (significantly) with # are totally ignored, and | |
3890 | may appear within a sequence of backslash-continued lines. | |
3891 | ||
3892 | . Blank lines are ignored, but will end a sequence of continuations. | |
3893 | ||
3894 | Arguments: none | |
3895 | Returns: a pointer to the next line | |
3896 | */ | |
3897 | ||
3898 | ||
3899 | static uschar *acl_text; /* Current pointer in the text */ | |
3900 | static uschar *acl_text_end; /* Points one past the terminating '0' */ | |
3901 | ||
3902 | ||
3903 | static uschar * | |
3904 | acl_getline(void) | |
3905 | { | |
3906 | uschar *yield; | |
3907 | ||
3908 | /* This loop handles leading blank lines and comments. */ | |
3909 | ||
3910 | for(;;) | |
3911 | { | |
3912 | while (isspace(*acl_text)) acl_text++; /* Leading spaces/empty lines */ | |
3913 | if (*acl_text == 0) return NULL; /* No more data */ | |
3914 | yield = acl_text; /* Potential data line */ | |
3915 | ||
3916 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3917 | ||
3918 | /* If we hit the end before a newline, we have the whole logical line. If | |
3919 | it's a comment, there's no more data to be given. Otherwise, yield it. */ | |
3920 | ||
3921 | if (*acl_text == 0) return (*yield == '#')? NULL : yield; | |
3922 | ||
3923 | /* After reaching a newline, end this loop if the physical line does not | |
3924 | start with '#'. If it does, it's a comment, and the loop continues. */ | |
3925 | ||
3926 | if (*yield != '#') break; | |
3927 | } | |
3928 | ||
3929 | /* This loop handles continuations. We know we have some real data, ending in | |
3930 | newline. See if there is a continuation marker at the end (ignoring trailing | |
3931 | white space). We know that *yield is not white space, so no need to test for | |
3932 | cont > yield in the backwards scanning loop. */ | |
3933 | ||
3934 | for(;;) | |
3935 | { | |
3936 | uschar *cont; | |
3937 | for (cont = acl_text - 1; isspace(*cont); cont--); | |
3938 | ||
3939 | /* If no continuation follows, we are done. Mark the end of the line and | |
3940 | return it. */ | |
3941 | ||
3942 | if (*cont != '\\') | |
3943 | { | |
3944 | *acl_text++ = 0; | |
3945 | return yield; | |
3946 | } | |
3947 | ||
3948 | /* We have encountered a continuation. Skip over whitespace at the start of | |
3949 | the next line, and indeed the whole of the next line or lines if they are | |
3950 | comment lines. */ | |
3951 | ||
3952 | for (;;) | |
3953 | { | |
3954 | while (*(++acl_text) == ' ' || *acl_text == '\t'); | |
3955 | if (*acl_text != '#') break; | |
3956 | while (*(++acl_text) != 0 && *acl_text != '\n'); | |
3957 | } | |
3958 | ||
3959 | /* We have the start of a continuation line. Move all the rest of the data | |
3960 | to join onto the previous line, and then find its end. If the end is not a | |
3961 | newline, we are done. Otherwise loop to look for another continuation. */ | |
3962 | ||
3963 | memmove(cont, acl_text, acl_text_end - acl_text); | |
3964 | acl_text_end -= acl_text - cont; | |
3965 | acl_text = cont; | |
3966 | while (*acl_text != 0 && *acl_text != '\n') acl_text++; | |
3967 | if (*acl_text == 0) return yield; | |
3968 | } | |
3969 | ||
3970 | /* Control does not reach here */ | |
3971 | } | |
3972 | ||
3973 | ||
3974 | ||
3975 | ||
3976 | ||
3977 | /************************************************* | |
3978 | * Check access using an ACL * | |
3979 | *************************************************/ | |
3980 | ||
3981 | /* This function is called from address_check. It may recurse via | |
3982 | acl_check_condition() - hence the use of a level to stop looping. The ACL is | |
3983 | passed as a string which is expanded. A forced failure implies no access check | |
3984 | is required. If the result is a single word, it is taken as the name of an ACL | |
3985 | which is sought in the global ACL tree. Otherwise, it is taken as literal ACL | |
3986 | text, complete with newlines, and parsed as such. In both cases, the ACL check | |
3987 | is then run. This function uses an auxiliary function for acl_read() to call | |
3988 | for reading individual lines of a literal ACL. This is acl_getline(), which | |
3989 | appears immediately above. | |
3990 | ||
3991 | Arguments: | |
3992 | where where called from | |
3993 | addr address item when called from RCPT; otherwise NULL | |
3994 | s the input string; NULL is the same as an empty ACL => DENY | |
3995 | level the nesting level | |
3996 | user_msgptr where to put a user error (for SMTP response) | |
3997 | log_msgptr where to put a logging message (not for SMTP response) | |
3998 | ||
3999 | Returns: OK access is granted | |
4000 | DISCARD access is apparently granted... | |
4001 | FAIL access is denied | |
4002 | FAIL_DROP access is denied; drop the connection | |
4003 | DEFER can't tell at the moment | |
4004 | ERROR disaster | |
4005 | */ | |
4006 | ||
4007 | static int | |
4008 | acl_check_internal(int where, address_item *addr, uschar *s, int level, | |
4009 | uschar **user_msgptr, uschar **log_msgptr) | |
4010 | { | |
4011 | int fd = -1; | |
4012 | acl_block *acl = NULL; | |
4013 | uschar *acl_name = US"inline ACL"; | |
4014 | uschar *ss; | |
4015 | ||
4016 | /* Catch configuration loops */ | |
4017 | ||
4018 | if (level > 20) | |
4019 | { | |
4020 | *log_msgptr = US"ACL nested too deep: possible loop"; | |
4021 | return ERROR; | |
4022 | } | |
4023 | ||
4024 | if (s == NULL) | |
4025 | { | |
4026 | HDEBUG(D_acl) debug_printf("ACL is NULL: implicit DENY\n"); | |
4027 | return FAIL; | |
4028 | } | |
4029 | ||
4030 | /* At top level, we expand the incoming string. At lower levels, it has already | |
4031 | been expanded as part of condition processing. */ | |
4032 | ||
4033 | if (level == 0) | |
4034 | { | |
4035 | ss = expand_string(s); | |
4036 | if (ss == NULL) | |
4037 | { | |
4038 | if (expand_string_forcedfail) return OK; | |
4039 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", s, | |
4040 | expand_string_message); | |
4041 | return ERROR; | |
4042 | } | |
4043 | } | |
4044 | else ss = s; | |
4045 | ||
4046 | while (isspace(*ss))ss++; | |
4047 | ||
4048 | /* If we can't find a named ACL, the default is to parse it as an inline one. | |
4049 | (Unless it begins with a slash; non-existent files give rise to an error.) */ | |
4050 | ||
4051 | acl_text = ss; | |
4052 | ||
4053 | /* Handle the case of a string that does not contain any spaces. Look for a | |
4054 | named ACL among those read from the configuration, or a previously read file. | |
4055 | It is possible that the pointer to the ACL is NULL if the configuration | |
4056 | contains a name with no data. If not found, and the text begins with '/', | |
4057 | read an ACL from a file, and save it so it can be re-used. */ | |
4058 | ||
4059 | if (Ustrchr(ss, ' ') == NULL) | |
4060 | { | |
4061 | tree_node *t = tree_search(acl_anchor, ss); | |
4062 | if (t != NULL) | |
4063 | { | |
4064 | acl = (acl_block *)(t->data.ptr); | |
4065 | if (acl == NULL) | |
4066 | { | |
4067 | HDEBUG(D_acl) debug_printf("ACL \"%s\" is empty: implicit DENY\n", ss); | |
4068 | return FAIL; | |
4069 | } | |
4070 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
4071 | HDEBUG(D_acl) debug_printf("using ACL \"%s\"\n", ss); | |
4072 | } | |
4073 | ||
4074 | else if (*ss == '/') | |
4075 | { | |
4076 | struct stat statbuf; | |
4077 | fd = Uopen(ss, O_RDONLY, 0); | |
4078 | if (fd < 0) | |
4079 | { | |
4080 | *log_msgptr = string_sprintf("failed to open ACL file \"%s\": %s", ss, | |
4081 | strerror(errno)); | |
4082 | return ERROR; | |
4083 | } | |
4084 | ||
4085 | if (fstat(fd, &statbuf) != 0) | |
4086 | { | |
4087 | *log_msgptr = string_sprintf("failed to fstat ACL file \"%s\": %s", ss, | |
4088 | strerror(errno)); | |
4089 | return ERROR; | |
4090 | } | |
4091 | ||
4092 | acl_text = store_get(statbuf.st_size + 1); | |
4093 | acl_text_end = acl_text + statbuf.st_size + 1; | |
4094 | ||
4095 | if (read(fd, acl_text, statbuf.st_size) != statbuf.st_size) | |
4096 | { | |
4097 | *log_msgptr = string_sprintf("failed to read ACL file \"%s\": %s", | |
4098 | ss, strerror(errno)); | |
4099 | return ERROR; | |
4100 | } | |
4101 | acl_text[statbuf.st_size] = 0; | |
f1e894f3 | 4102 | (void)close(fd); |
059ec3d9 PH |
4103 | |
4104 | acl_name = string_sprintf("ACL \"%s\"", ss); | |
4105 | HDEBUG(D_acl) debug_printf("read ACL from file %s\n", ss); | |
4106 | } | |
4107 | } | |
4108 | ||
4109 | /* Parse an ACL that is still in text form. If it came from a file, remember it | |
4110 | in the ACL tree, having read it into the POOL_PERM store pool so that it | |
4111 | persists between multiple messages. */ | |
4112 | ||
4113 | if (acl == NULL) | |
4114 | { | |
4115 | int old_pool = store_pool; | |
4116 | if (fd >= 0) store_pool = POOL_PERM; | |
4117 | acl = acl_read(acl_getline, log_msgptr); | |
4118 | store_pool = old_pool; | |
4119 | if (acl == NULL && *log_msgptr != NULL) return ERROR; | |
4120 | if (fd >= 0) | |
4121 | { | |
4122 | tree_node *t = store_get_perm(sizeof(tree_node) + Ustrlen(ss)); | |
4123 | Ustrcpy(t->name, ss); | |
4124 | t->data.ptr = acl; | |
4125 | (void)tree_insertnode(&acl_anchor, t); | |
4126 | } | |
4127 | } | |
4128 | ||
4129 | /* Now we have an ACL to use. It's possible it may be NULL. */ | |
4130 | ||
4131 | while (acl != NULL) | |
4132 | { | |
4133 | int cond; | |
4134 | int basic_errno = 0; | |
4135 | BOOL endpass_seen = FALSE; | |
82c0c8ea JH |
4136 | BOOL acl_quit_check = level == 0 |
4137 | && (where == ACL_WHERE_QUIT || where == ACL_WHERE_NOTQUIT); | |
059ec3d9 PH |
4138 | |
4139 | *log_msgptr = *user_msgptr = NULL; | |
4140 | acl_temp_details = FALSE; | |
4141 | ||
059ec3d9 PH |
4142 | HDEBUG(D_acl) debug_printf("processing \"%s\"\n", verbs[acl->verb]); |
4143 | ||
4144 | /* Clear out any search error message from a previous check before testing | |
4145 | this condition. */ | |
4146 | ||
4147 | search_error_message = NULL; | |
4148 | cond = acl_check_condition(acl->verb, acl->condition, where, addr, level, | |
4149 | &endpass_seen, user_msgptr, log_msgptr, &basic_errno); | |
4150 | ||
4151 | /* Handle special returns: DEFER causes a return except on a WARN verb; | |
4152 | ERROR always causes a return. */ | |
4153 | ||
4154 | switch (cond) | |
4155 | { | |
4156 | case DEFER: | |
6968512f | 4157 | HDEBUG(D_acl) debug_printf("%s: condition test deferred in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4158 | if (basic_errno != ERRNO_CALLOUTDEFER) |
4159 | { | |
4160 | if (search_error_message != NULL && *search_error_message != 0) | |
4161 | *log_msgptr = search_error_message; | |
4162 | if (smtp_return_error_details) acl_temp_details = TRUE; | |
4163 | } | |
4164 | else | |
4165 | { | |
4166 | acl_temp_details = TRUE; | |
4167 | } | |
4168 | if (acl->verb != ACL_WARN) return DEFER; | |
4169 | break; | |
4170 | ||
4171 | default: /* Paranoia */ | |
4172 | case ERROR: | |
6968512f | 4173 | HDEBUG(D_acl) debug_printf("%s: condition test error in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4174 | return ERROR; |
4175 | ||
4176 | case OK: | |
6968512f JH |
4177 | HDEBUG(D_acl) debug_printf("%s: condition test succeeded in %s\n", |
4178 | verbs[acl->verb], acl_name); | |
059ec3d9 PH |
4179 | break; |
4180 | ||
4181 | case FAIL: | |
6968512f | 4182 | HDEBUG(D_acl) debug_printf("%s: condition test failed in %s\n", verbs[acl->verb], acl_name); |
059ec3d9 PH |
4183 | break; |
4184 | ||
4185 | /* DISCARD and DROP can happen only from a nested ACL condition, and | |
4186 | DISCARD can happen only for an "accept" or "discard" verb. */ | |
4187 | ||
4188 | case DISCARD: | |
6968512f JH |
4189 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"discard\" in %s\n", |
4190 | verbs[acl->verb], acl_name); | |
059ec3d9 PH |
4191 | break; |
4192 | ||
4193 | case FAIL_DROP: | |
6968512f JH |
4194 | HDEBUG(D_acl) debug_printf("%s: condition test yielded \"drop\" in %s\n", |
4195 | verbs[acl->verb], acl_name); | |
059ec3d9 PH |
4196 | break; |
4197 | } | |
4198 | ||
4199 | /* At this point, cond for most verbs is either OK or FAIL or (as a result of | |
4200 | a nested ACL condition) FAIL_DROP. However, for WARN, cond may be DEFER, and | |
4201 | for ACCEPT and DISCARD, it may be DISCARD after a nested ACL call. */ | |
4202 | ||
4203 | switch(acl->verb) | |
4204 | { | |
4205 | case ACL_ACCEPT: | |
a7538db1 JH |
4206 | if (cond == OK || cond == DISCARD) |
4207 | { | |
4208 | HDEBUG(D_acl) debug_printf("end of %s: ACCEPT\n", acl_name); | |
4209 | return cond; | |
4210 | } | |
059ec3d9 PH |
4211 | if (endpass_seen) |
4212 | { | |
4213 | HDEBUG(D_acl) debug_printf("accept: endpass encountered - denying access\n"); | |
4214 | return cond; | |
4215 | } | |
4216 | break; | |
4217 | ||
4218 | case ACL_DEFER: | |
4219 | if (cond == OK) | |
4220 | { | |
a7538db1 | 4221 | HDEBUG(D_acl) debug_printf("end of %s: DEFER\n", acl_name); |
82c0c8ea | 4222 | if (acl_quit_check) goto badquit; |
059ec3d9 PH |
4223 | acl_temp_details = TRUE; |
4224 | return DEFER; | |
4225 | } | |
4226 | break; | |
4227 | ||
4228 | case ACL_DENY: | |
a7538db1 JH |
4229 | if (cond == OK) |
4230 | { | |
4231 | HDEBUG(D_acl) debug_printf("end of %s: DENY\n", acl_name); | |
82c0c8ea | 4232 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4233 | return FAIL; |
4234 | } | |
059ec3d9 PH |
4235 | break; |
4236 | ||
4237 | case ACL_DISCARD: | |
a7538db1 JH |
4238 | if (cond == OK || cond == DISCARD) |
4239 | { | |
4240 | HDEBUG(D_acl) debug_printf("end of %s: DISCARD\n", acl_name); | |
82c0c8ea | 4241 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4242 | return DISCARD; |
4243 | } | |
059ec3d9 PH |
4244 | if (endpass_seen) |
4245 | { | |
4246 | HDEBUG(D_acl) debug_printf("discard: endpass encountered - denying access\n"); | |
4247 | return cond; | |
4248 | } | |
4249 | break; | |
4250 | ||
4251 | case ACL_DROP: | |
a7538db1 JH |
4252 | if (cond == OK) |
4253 | { | |
4254 | HDEBUG(D_acl) debug_printf("end of %s: DROP\n", acl_name); | |
82c0c8ea | 4255 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4256 | return FAIL_DROP; |
4257 | } | |
059ec3d9 PH |
4258 | break; |
4259 | ||
4260 | case ACL_REQUIRE: | |
a7538db1 JH |
4261 | if (cond != OK) |
4262 | { | |
4263 | HDEBUG(D_acl) debug_printf("end of %s: not OK\n", acl_name); | |
82c0c8ea | 4264 | if (acl_quit_check) goto badquit; |
a7538db1 JH |
4265 | return cond; |
4266 | } | |
059ec3d9 PH |
4267 | break; |
4268 | ||
4269 | case ACL_WARN: | |
4270 | if (cond == OK) | |
4271 | acl_warn(where, *user_msgptr, *log_msgptr); | |
6c6d6e48 | 4272 | else if (cond == DEFER && LOGGING(acl_warn_skipped)) |
9c7a242c PH |
4273 | log_write(0, LOG_MAIN, "%s Warning: ACL \"warn\" statement skipped: " |
4274 | "condition test deferred%s%s", host_and_ident(TRUE), | |
4275 | (*log_msgptr == NULL)? US"" : US": ", | |
4276 | (*log_msgptr == NULL)? US"" : *log_msgptr); | |
059ec3d9 PH |
4277 | *log_msgptr = *user_msgptr = NULL; /* In case implicit DENY follows */ |
4278 | break; | |
4279 | ||
4280 | default: | |
4281 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "internal ACL error: unknown verb %d", | |
4282 | acl->verb); | |
4283 | break; | |
4284 | } | |
4285 | ||
4286 | /* Pass to the next ACL item */ | |
4287 | ||
4288 | acl = acl->next; | |
4289 | } | |
4290 | ||
4291 | /* We have reached the end of the ACL. This is an implicit DENY. */ | |
4292 | ||
4293 | HDEBUG(D_acl) debug_printf("end of %s: implicit DENY\n", acl_name); | |
4294 | return FAIL; | |
82c0c8ea JH |
4295 | |
4296 | badquit: | |
4297 | *log_msgptr = string_sprintf("QUIT or not-QUIT teplevel ACL may not fail " | |
4298 | "('%s' verb used incorrectly)", verbs[acl->verb]); | |
4299 | return ERROR; | |
059ec3d9 PH |
4300 | } |
4301 | ||
4302 | ||
333eea9c JH |
4303 | |
4304 | ||
4305 | /* Same args as acl_check_internal() above, but the string s is | |
4306 | the name of an ACL followed optionally by up to 9 space-separated arguments. | |
4307 | The name and args are separately expanded. Args go into $acl_arg globals. */ | |
f60d98e8 | 4308 | static int |
55414b25 | 4309 | acl_check_wargs(int where, address_item *addr, const uschar *s, int level, |
333eea9c JH |
4310 | uschar **user_msgptr, uschar **log_msgptr) |
4311 | { | |
4312 | uschar * tmp; | |
bef3ea7f | 4313 | uschar * tmp_arg[9]; /* must match acl_arg[] */ |
ef21c07d JH |
4314 | uschar * sav_arg[9]; /* must match acl_arg[] */ |
4315 | int sav_narg; | |
333eea9c | 4316 | uschar * name; |
bef3ea7f | 4317 | int i; |
ef21c07d | 4318 | int ret; |
333eea9c JH |
4319 | |
4320 | if (!(tmp = string_dequote(&s)) || !(name = expand_string(tmp))) | |
4321 | goto bad; | |
4322 | ||
bef3ea7f | 4323 | for (i = 0; i < 9; i++) |
333eea9c JH |
4324 | { |
4325 | while (*s && isspace(*s)) s++; | |
4326 | if (!*s) break; | |
bef3ea7f | 4327 | if (!(tmp = string_dequote(&s)) || !(tmp_arg[i] = expand_string(tmp))) |
333eea9c JH |
4328 | { |
4329 | tmp = name; | |
4330 | goto bad; | |
4331 | } | |
4332 | } | |
ef21c07d JH |
4333 | |
4334 | sav_narg = acl_narg; | |
bef3ea7f | 4335 | acl_narg = i; |
ef21c07d JH |
4336 | for (i = 0; i < acl_narg; i++) |
4337 | { | |
4338 | sav_arg[i] = acl_arg[i]; | |
4339 | acl_arg[i] = tmp_arg[i]; | |
4340 | } | |
4341 | while (i < 9) | |
4342 | { | |
4343 | sav_arg[i] = acl_arg[i]; | |
4344 | acl_arg[i++] = NULL; | |
4345 | } | |
4346 | ||
4347 | ret = acl_check_internal(where, addr, name, level, user_msgptr, log_msgptr); | |
333eea9c | 4348 | |
ef21c07d JH |
4349 | acl_narg = sav_narg; |
4350 | for (i = 0; i < 9; i++) acl_arg[i] = sav_arg[i]; | |
4351 | return ret; | |
333eea9c JH |
4352 | |
4353 | bad: | |
4354 | if (expand_string_forcedfail) return ERROR; | |
4355 | *log_msgptr = string_sprintf("failed to expand ACL string \"%s\": %s", | |
4356 | tmp, expand_string_message); | |
4357 | return search_find_defer?DEFER:ERROR; | |
4358 | } | |
4359 | ||
4360 | ||
4361 | ||
059ec3d9 PH |
4362 | /************************************************* |
4363 | * Check access using an ACL * | |
4364 | *************************************************/ | |
4365 | ||
faa05a93 JH |
4366 | /* Alternate interface for ACL, used by expansions */ |
4367 | int | |
05caaeaa | 4368 | acl_eval(int where, uschar *s, uschar **user_msgptr, uschar **log_msgptr) |
faa05a93 | 4369 | { |
faa05a93 JH |
4370 | address_item adb; |
4371 | address_item *addr = NULL; | |
4372 | ||
4373 | *user_msgptr = *log_msgptr = NULL; | |
4374 | sender_verified_failed = NULL; | |
4375 | ratelimiters_cmd = NULL; | |
4376 | log_reject_target = LOG_MAIN|LOG_REJECT; | |
4377 | ||
4378 | if (where == ACL_WHERE_RCPT) | |
4379 | { | |
4380 | adb = address_defaults; | |
4381 | addr = &adb; | |
05caaeaa JH |
4382 | addr->address = expand_string(US"$local_part@$domain"); |
4383 | addr->domain = deliver_domain; | |
4384 | addr->local_part = deliver_localpart; | |
4385 | addr->cc_local_part = deliver_localpart; | |
4386 | addr->lc_local_part = deliver_localpart; | |
faa05a93 JH |
4387 | } |
4388 | ||
4389 | return acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr); | |
4390 | } | |
4391 | ||
4392 | ||
4393 | ||
059ec3d9 PH |
4394 | /* This is the external interface for ACL checks. It sets up an address and the |
4395 | expansions for $domain and $local_part when called after RCPT, then calls | |
4396 | acl_check_internal() to do the actual work. | |
4397 | ||
4398 | Arguments: | |
4399 | where ACL_WHERE_xxxx indicating where called from | |
64ffc24f | 4400 | recipient RCPT address for RCPT check, else NULL |
059ec3d9 PH |
4401 | s the input string; NULL is the same as an empty ACL => DENY |
4402 | user_msgptr where to put a user error (for SMTP response) | |
4403 | log_msgptr where to put a logging message (not for SMTP response) | |
4404 | ||
4405 | Returns: OK access is granted by an ACCEPT verb | |
4406 | DISCARD access is granted by a DISCARD verb | |
4407 | FAIL access is denied | |
4408 | FAIL_DROP access is denied; drop the connection | |
4409 | DEFER can't tell at the moment | |
4410 | ERROR disaster | |
4411 | */ | |
faa05a93 | 4412 | int acl_where = ACL_WHERE_UNKNOWN; |
059ec3d9 PH |
4413 | |
4414 | int | |
64ffc24f | 4415 | acl_check(int where, uschar *recipient, uschar *s, uschar **user_msgptr, |
059ec3d9 PH |
4416 | uschar **log_msgptr) |
4417 | { | |
4418 | int rc; | |
4419 | address_item adb; | |
64ffc24f | 4420 | address_item *addr = NULL; |
059ec3d9 PH |
4421 | |
4422 | *user_msgptr = *log_msgptr = NULL; | |
4423 | sender_verified_failed = NULL; | |
fe0dab11 | 4424 | ratelimiters_cmd = NULL; |
6ea85e9a | 4425 | log_reject_target = LOG_MAIN|LOG_REJECT; |
059ec3d9 | 4426 | |
8ccd00b1 | 4427 | #ifndef DISABLE_PRDR |
4f6ae5c3 | 4428 | if (where==ACL_WHERE_RCPT || where==ACL_WHERE_VRFY || where==ACL_WHERE_PRDR) |
fd98a5c6 | 4429 | #else |
4f6ae5c3 | 4430 | if (where==ACL_WHERE_RCPT || where==ACL_WHERE_VRFY) |
fd98a5c6 | 4431 | #endif |
059ec3d9 PH |
4432 | { |
4433 | adb = address_defaults; | |
4434 | addr = &adb; | |
64ffc24f | 4435 | addr->address = recipient; |
059ec3d9 PH |
4436 | if (deliver_split_address(addr) == DEFER) |
4437 | { | |
4438 | *log_msgptr = US"defer in percent_hack_domains check"; | |
4439 | return DEFER; | |
4440 | } | |
8c5d388a | 4441 | #ifdef SUPPORT_I18N |
3c8b3577 JH |
4442 | if ((addr->prop.utf8_msg = message_smtputf8)) |
4443 | { | |
4444 | addr->prop.utf8_downcvt = message_utf8_downconvert == 1; | |
4445 | addr->prop.utf8_downcvt_maybe = message_utf8_downconvert == -1; | |
4446 | } | |
9bfc60eb | 4447 | #endif |
059ec3d9 PH |
4448 | deliver_domain = addr->domain; |
4449 | deliver_localpart = addr->local_part; | |
4450 | } | |
059ec3d9 | 4451 | |
faa05a93 | 4452 | acl_where = where; |
059ec3d9 | 4453 | rc = acl_check_internal(where, addr, s, 0, user_msgptr, log_msgptr); |
faa05a93 | 4454 | acl_where = ACL_WHERE_UNKNOWN; |
059ec3d9 | 4455 | |
817d9f57 JH |
4456 | /* Cutthrough - if requested, |
4457 | and WHERE_RCPT and not yet opened conn as result of recipient-verify, | |
4458 | and rcpt acl returned accept, | |
4459 | and first recipient (cancel on any subsequents) | |
e4bdf652 | 4460 | open one now and run it up to RCPT acceptance. |
f9334a28 JH |
4461 | A failed verify should cancel cutthrough request, |
4462 | and will pass the fail to the originator. | |
817d9f57 | 4463 | Initial implementation: dual-write to spool. |
e4bdf652 JH |
4464 | Assume the rxd datastream is now being copied byte-for-byte to an open cutthrough connection. |
4465 | ||
4466 | Cease cutthrough copy on rxd final dot; do not send one. | |
4467 | ||
4468 | On a data acl, if not accept and a cutthrough conn is open, hard-close it (no SMTP niceness). | |
4469 | ||
4470 | On data acl accept, terminate the dataphase on an open cutthrough conn. If accepted or | |
4471 | perm-rejected, reflect that to the original sender - and dump the spooled copy. | |
4472 | If temp-reject, close the conn (and keep the spooled copy). | |
4473 | If conn-failure, no action (and keep the spooled copy). | |
e4bdf652 JH |
4474 | */ |
4475 | switch (where) | |
ff5929e3 JH |
4476 | { |
4477 | case ACL_WHERE_RCPT: | |
8ccd00b1 | 4478 | #ifndef DISABLE_PRDR |
ff5929e3 | 4479 | case ACL_WHERE_PRDR: |
fd98a5c6 | 4480 | #endif |
ff5929e3 JH |
4481 | if (host_checking_callout) /* -bhc mode */ |
4482 | cancel_cutthrough_connection("host-checking mode"); | |
4483 | ||
4484 | else if ( rc == OK | |
4485 | && cutthrough.delivery | |
4486 | && rcpt_count > cutthrough.nrcpt | |
4487 | && (rc = open_cutthrough_connection(addr)) == DEFER | |
4488 | ) | |
4489 | if (cutthrough.defer_pass) | |
4490 | { | |
4491 | uschar * s = addr->message; | |
4492 | /* Horrid kludge to recover target's SMTP message */ | |
4493 | while (*s) s++; | |
4494 | do --s; while (!isdigit(*s)); | |
4495 | if (*--s && isdigit(*s) && *--s && isdigit(*s)) *user_msgptr = s; | |
4496 | acl_temp_details = TRUE; | |
4497 | } | |
4498 | else | |
4499 | { | |
4500 | HDEBUG(D_acl) debug_printf("cutthrough defer; will spool\n"); | |
4501 | rc = OK; | |
4502 | } | |
4503 | break; | |
e4bdf652 | 4504 | |
ff5929e3 JH |
4505 | case ACL_WHERE_PREDATA: |
4506 | if (rc == OK) | |
4507 | cutthrough_predata(); | |
4508 | else | |
4509 | cancel_cutthrough_connection("predata acl not ok"); | |
4510 | break; | |
e4bdf652 | 4511 | |
ff5929e3 JH |
4512 | case ACL_WHERE_QUIT: |
4513 | case ACL_WHERE_NOTQUIT: | |
4514 | cancel_cutthrough_connection("quit or notquit"); | |
4515 | break; | |
e4bdf652 | 4516 | |
ff5929e3 JH |
4517 | default: |
4518 | break; | |
4519 | } | |
e4bdf652 | 4520 | |
64ffc24f PH |
4521 | deliver_domain = deliver_localpart = deliver_address_data = |
4522 | sender_address_data = NULL; | |
059ec3d9 PH |
4523 | |
4524 | /* A DISCARD response is permitted only for message ACLs, excluding the PREDATA | |
4525 | ACL, which is really in the middle of an SMTP command. */ | |
4526 | ||
4527 | if (rc == DISCARD) | |
4528 | { | |
4529 | if (where > ACL_WHERE_NOTSMTP || where == ACL_WHERE_PREDATA) | |
4530 | { | |
4531 | log_write(0, LOG_MAIN|LOG_PANIC, "\"discard\" verb not allowed in %s " | |
4532 | "ACL", acl_wherenames[where]); | |
4533 | return ERROR; | |
4534 | } | |
4535 | return DISCARD; | |
4536 | } | |
4537 | ||
4538 | /* A DROP response is not permitted from MAILAUTH */ | |
4539 | ||
4540 | if (rc == FAIL_DROP && where == ACL_WHERE_MAILAUTH) | |
4541 | { | |
4542 | log_write(0, LOG_MAIN|LOG_PANIC, "\"drop\" verb not allowed in %s " | |
4543 | "ACL", acl_wherenames[where]); | |
4544 | return ERROR; | |
4545 | } | |
4546 | ||
4e88a19f PH |
4547 | /* Before giving a response, take a look at the length of any user message, and |
4548 | split it up into multiple lines if possible. */ | |
059ec3d9 | 4549 | |
e28326d8 PH |
4550 | *user_msgptr = string_split_message(*user_msgptr); |
4551 | if (fake_response != OK) | |
4552 | fake_response_text = string_split_message(fake_response_text); | |
059ec3d9 PH |
4553 | |
4554 | return rc; | |
4555 | } | |
4556 | ||
38a0a95f | 4557 | |
38a0a95f PH |
4558 | /************************************************* |
4559 | * Create ACL variable * | |
4560 | *************************************************/ | |
4561 | ||
4562 | /* Create an ACL variable or reuse an existing one. ACL variables are in a | |
4563 | binary tree (see tree.c) with acl_var_c and acl_var_m as root nodes. | |
4564 | ||
4565 | Argument: | |
4566 | name pointer to the variable's name, starting with c or m | |
4567 | ||
4568 | Returns the pointer to variable's tree node | |
4569 | */ | |
4570 | ||
4571 | tree_node * | |
4572 | acl_var_create(uschar *name) | |
4573 | { | |
4574 | tree_node *node, **root; | |
4575 | root = (name[0] == 'c')? &acl_var_c : &acl_var_m; | |
4576 | node = tree_search(*root, name); | |
4577 | if (node == NULL) | |
4578 | { | |
4579 | node = store_get(sizeof(tree_node) + Ustrlen(name)); | |
4580 | Ustrcpy(node->name, name); | |
4581 | (void)tree_insertnode(root, node); | |
4582 | } | |
4583 | node->data.ptr = NULL; | |
4584 | return node; | |
4585 | } | |
4586 | ||
4587 | ||
4588 | ||
4589 | /************************************************* | |
4590 | * Write an ACL variable in spool format * | |
4591 | *************************************************/ | |
4592 | ||
4593 | /* This function is used as a callback for tree_walk when writing variables to | |
4594 | the spool file. To retain spool file compatibility, what is written is -aclc or | |
4595 | -aclm followed by the rest of the name and the data length, space separated, | |
4596 | then the value itself, starting on a new line, and terminated by an additional | |
4597 | newline. When we had only numbered ACL variables, the first line might look | |
4598 | like this: "-aclc 5 20". Now it might be "-aclc foo 20" for the variable called | |
4599 | acl_cfoo. | |
4600 | ||
4601 | Arguments: | |
4602 | name of the variable | |
4603 | value of the variable | |
4604 | ctx FILE pointer (as a void pointer) | |
4605 | ||
4606 | Returns: nothing | |
4607 | */ | |
4608 | ||
4609 | void | |
4610 | acl_var_write(uschar *name, uschar *value, void *ctx) | |
4611 | { | |
4612 | FILE *f = (FILE *)ctx; | |
4613 | fprintf(f, "-acl%c %s %d\n%s\n", name[0], name+1, Ustrlen(value), value); | |
4614 | } | |
4615 | ||
9171d434 JH |
4616 | /* vi: aw ai sw=2 |
4617 | */ | |
059ec3d9 | 4618 | /* End of acl.c */ |