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91ecef39 | 1 | /* $Cambridge: exim/src/src/rda.c,v 1.13 2006/09/05 14:05:43 ph10 Exp $ */ |
059ec3d9 PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
d7d7b7b9 | 7 | /* Copyright (c) University of Cambridge 1995 - 2006 */ |
059ec3d9 PH |
8 | /* See the file NOTICE for conditions of use and distribution. */ |
9 | ||
10 | /* This module contains code for extracting addresses from a forwarding list | |
11 | (from an alias or forward file) or by running the filter interpreter. It may do | |
12 | this in a sub-process if a uid/gid are supplied. */ | |
13 | ||
14 | ||
15 | #include "exim.h" | |
16 | ||
17 | enum { FILE_EXIST, FILE_NOT_EXIST, FILE_EXIST_UNCLEAR }; | |
18 | ||
19 | #define REPLY_EXISTS 0x01 | |
20 | #define REPLY_EXPAND 0x02 | |
21 | #define REPLY_RETURN 0x04 | |
22 | ||
23 | ||
24 | /************************************************* | |
25 | * Check string for filter program * | |
26 | *************************************************/ | |
27 | ||
28 | /* This function checks whether a string is actually a filter program. The rule | |
29 | is that it must start with "# Exim filter ..." (any capitalization, spaces | |
30 | optional). It is envisaged that in future, other kinds of filter may be | |
31 | implemented. That's why it is implemented the way it is. The function is global | |
32 | because it is also called from filter.c when checking filters. | |
33 | ||
34 | Argument: the string | |
35 | ||
36 | Returns: FILTER_EXIM if it starts with "# Exim filter" | |
37 | FILTER_SIEVE if it starts with "# Sieve filter" | |
38 | FILTER_FORWARD otherwise | |
39 | */ | |
40 | ||
41 | /* This is an auxiliary function for matching a tag. */ | |
42 | ||
43 | static BOOL | |
44 | match_tag(const uschar *s, const uschar *tag) | |
45 | { | |
46 | for (; *tag != 0; s++, tag++) | |
47 | { | |
48 | if (*tag == ' ') | |
49 | { | |
50 | while (*s == ' ' || *s == '\t') s++; | |
51 | s--; | |
52 | } | |
53 | else if (tolower(*s) != tolower(*tag)) break; | |
54 | } | |
55 | return (*tag == 0); | |
56 | } | |
57 | ||
58 | /* This is the real function. It should be easy to add checking different | |
59 | tags for other types of filter. */ | |
60 | ||
61 | int | |
62 | rda_is_filter(const uschar *s) | |
63 | { | |
64 | while (isspace(*s)) s++; /* Skips initial blank lines */ | |
65 | if (match_tag(s, CUS"# exim filter")) return FILTER_EXIM; | |
66 | else if (match_tag(s, CUS"# sieve filter")) return FILTER_SIEVE; | |
67 | else return FILTER_FORWARD; | |
68 | } | |
69 | ||
70 | ||
71 | ||
72 | ||
73 | /************************************************* | |
74 | * Check for existence of file * | |
75 | *************************************************/ | |
76 | ||
77 | /* First of all, we stat the file. If this fails, we try to stat the enclosing | |
78 | directory, because a file in an unmounted NFS directory will look the same as a | |
79 | non-existent file. It seems that in Solaris 2.6, statting an entry in an | |
80 | indirect map that is currently unmounted does not cause the mount to happen. | |
81 | Instead, dummy data is returned, which defeats the whole point of this test. | |
82 | However, if a stat() is done on some object inside the directory, such as the | |
83 | "." back reference to itself, then the mount does occur. If an NFS host is | |
84 | taken offline, it is possible for the stat() to get stuck until it comes back. | |
85 | To guard against this, stick a timer round it. If we can't access the "." | |
86 | inside the directory, try the plain directory, just in case that helps. | |
87 | ||
88 | Argument: | |
89 | filename the file name | |
90 | error for message on error | |
91 | ||
92 | Returns: FILE_EXIST the file exists | |
93 | FILE_NOT_EXIST the file does not exist | |
94 | FILE_EXIST_UNCLEAR cannot determine existence | |
95 | */ | |
96 | ||
97 | static int | |
98 | rda_exists(uschar *filename, uschar **error) | |
99 | { | |
100 | int rc, saved_errno; | |
101 | uschar *slash; | |
102 | struct stat statbuf; | |
103 | ||
104 | if ((rc = Ustat(filename, &statbuf)) >= 0) return FILE_EXIST; | |
105 | saved_errno = errno; | |
106 | ||
107 | Ustrncpy(big_buffer, filename, big_buffer_size - 3); | |
108 | sigalrm_seen = FALSE; | |
109 | ||
110 | if (saved_errno == ENOENT) | |
111 | { | |
112 | slash = Ustrrchr(big_buffer, '/'); | |
113 | Ustrcpy(slash+1, "."); | |
114 | ||
115 | alarm(30); | |
116 | rc = Ustat(big_buffer, &statbuf); | |
117 | if (rc != 0 && errno == EACCES && !sigalrm_seen) | |
118 | { | |
119 | *slash = 0; | |
120 | rc = Ustat(big_buffer, &statbuf); | |
121 | } | |
122 | saved_errno = errno; | |
123 | alarm(0); | |
124 | ||
125 | DEBUG(D_route) debug_printf("stat(%s)=%d\n", big_buffer, rc); | |
126 | } | |
127 | ||
128 | if (sigalrm_seen || rc != 0) | |
129 | { | |
130 | *error = string_sprintf("failed to stat %s (%s)", big_buffer, | |
131 | sigalrm_seen? "timeout" : strerror(saved_errno)); | |
132 | return FILE_EXIST_UNCLEAR; | |
133 | } | |
134 | ||
135 | *error = string_sprintf("%s does not exist", filename); | |
136 | DEBUG(D_route) debug_printf("%s\n", *error); | |
137 | return FILE_NOT_EXIST; | |
138 | } | |
139 | ||
140 | ||
141 | ||
142 | /************************************************* | |
143 | * Get forwarding list from a file * | |
144 | *************************************************/ | |
145 | ||
146 | /* Open a file and read its entire contents into a block of memory. Certain | |
147 | opening errors are optionally treated the same as "file does not exist". | |
148 | ||
149 | ENOTDIR means that something along the line is not a directory: there are | |
150 | installations that set home directories to be /dev/null for non-login accounts | |
151 | but in normal circumstances this indicates some kind of configuration error. | |
152 | ||
153 | EACCES means there's a permissions failure. Some users turn off read permission | |
154 | on a .forward file to suspend forwarding, but this is probably an error in any | |
155 | kind of mailing list processing. | |
156 | ||
157 | The redirect block that contains the file name also contains constraints such | |
158 | as who may own the file, and mode bits that must not be set. This function is | |
159 | ||
160 | Arguments: | |
161 | rdata rdirect block, containing file name and constraints | |
162 | options for the RDO_ENOTDIR and RDO_EACCES options | |
163 | error where to put an error message | |
164 | yield what to return from rda_interpret on error | |
165 | ||
166 | Returns: pointer to string in store; NULL on error | |
167 | */ | |
168 | ||
169 | static uschar * | |
170 | rda_get_file_contents(redirect_block *rdata, int options, uschar **error, | |
171 | int *yield) | |
172 | { | |
173 | FILE *fwd; | |
174 | uschar *filebuf; | |
175 | uschar *filename = rdata->string; | |
176 | BOOL uid_ok = !rdata->check_owner; | |
177 | BOOL gid_ok = !rdata->check_group; | |
178 | struct stat statbuf; | |
179 | ||
180 | /* Attempt to open the file. If it appears not to exist, check up on the | |
181 | containing directory by statting it. If the directory does not exist, we treat | |
182 | this situation as an error (which will cause delivery to defer); otherwise we | |
183 | pass back FF_NONEXIST, which causes the redirect router to decline. | |
184 | ||
185 | However, if the ignore_enotdir option is set (to ignore "something on the | |
186 | path is not a directory" errors), the right behaviour seems to be not to do the | |
187 | directory test. */ | |
188 | ||
189 | fwd = Ufopen(filename, "rb"); | |
190 | if (fwd == NULL) | |
191 | { | |
192 | switch(errno) | |
193 | { | |
194 | case ENOENT: /* File does not exist */ | |
195 | DEBUG(D_route) debug_printf("%s does not exist\n%schecking parent directory\n", | |
196 | filename, | |
197 | ((options & RDO_ENOTDIR) != 0)? "ignore_enotdir set => skip " : ""); | |
198 | *yield = (((options & RDO_ENOTDIR) != 0) || | |
199 | rda_exists(filename, error) == FILE_NOT_EXIST)? | |
200 | FF_NONEXIST : FF_ERROR; | |
201 | return NULL; | |
202 | ||
203 | case ENOTDIR: /* Something on the path isn't a directory */ | |
204 | if ((options & RDO_ENOTDIR) == 0) goto DEFAULT_ERROR; | |
205 | DEBUG(D_route) debug_printf("non-directory on path %s: file assumed not to " | |
206 | "exist\n", filename); | |
207 | *yield = FF_NONEXIST; | |
208 | return NULL; | |
209 | ||
210 | case EACCES: /* Permission denied */ | |
211 | if ((options & RDO_EACCES) == 0) goto DEFAULT_ERROR; | |
212 | DEBUG(D_route) debug_printf("permission denied for %s: file assumed not to " | |
213 | "exist\n", filename); | |
214 | *yield = FF_NONEXIST; | |
215 | return NULL; | |
216 | ||
217 | DEFAULT_ERROR: | |
218 | default: | |
219 | *error = string_open_failed(errno, "%s", filename); | |
220 | *yield = FF_ERROR; | |
221 | return NULL; | |
222 | } | |
223 | } | |
224 | ||
225 | /* Check that we have a regular file. */ | |
226 | ||
227 | if (fstat(fileno(fwd), &statbuf) != 0) | |
228 | { | |
229 | *error = string_sprintf("failed to stat %s: %s", filename, strerror(errno)); | |
230 | goto ERROR_RETURN; | |
231 | } | |
232 | ||
233 | if ((statbuf.st_mode & S_IFMT) != S_IFREG) | |
234 | { | |
235 | *error = string_sprintf("%s is not a regular file", filename); | |
236 | goto ERROR_RETURN; | |
237 | } | |
238 | ||
239 | /* Check for unwanted mode bits */ | |
240 | ||
241 | if ((statbuf.st_mode & rdata->modemask) != 0) | |
242 | { | |
243 | *error = string_sprintf("bad mode (0%o) for %s: 0%o bit(s) unexpected", | |
244 | statbuf.st_mode, filename, statbuf.st_mode & rdata->modemask); | |
245 | goto ERROR_RETURN; | |
246 | } | |
247 | ||
248 | /* Check the file owner and file group if required to do so. */ | |
249 | ||
250 | if (!uid_ok) | |
251 | { | |
252 | if (rdata->pw != NULL && statbuf.st_uid == rdata->pw->pw_uid) | |
253 | uid_ok = TRUE; | |
254 | else if (rdata->owners != NULL) | |
255 | { | |
256 | int i; | |
257 | for (i = 1; i <= (int)(rdata->owners[0]); i++) | |
258 | if (rdata->owners[i] == statbuf.st_uid) { uid_ok = TRUE; break; } | |
259 | } | |
260 | } | |
261 | ||
262 | if (!gid_ok) | |
263 | { | |
264 | if (rdata->pw != NULL && statbuf.st_gid == rdata->pw->pw_gid) | |
265 | gid_ok = TRUE; | |
266 | else if (rdata->owngroups != NULL) | |
267 | { | |
268 | int i; | |
269 | for (i = 1; i <= (int)(rdata->owngroups[0]); i++) | |
270 | if (rdata->owngroups[i] == statbuf.st_gid) { gid_ok = TRUE; break; } | |
271 | } | |
272 | } | |
273 | ||
274 | if (!uid_ok || !gid_ok) | |
275 | { | |
276 | *error = string_sprintf("bad %s for %s", uid_ok? "group" : "owner", filename); | |
277 | goto ERROR_RETURN; | |
278 | } | |
279 | ||
280 | /* Put an upper limit on the size of the file, just to stop silly people | |
281 | feeding in ridiculously large files, which can easily be created by making | |
282 | files that have holes in them. */ | |
283 | ||
284 | if (statbuf.st_size > MAX_FILTER_SIZE) | |
285 | { | |
286 | *error = string_sprintf("%s is too big (max %d)", filename, MAX_FILTER_SIZE); | |
287 | goto ERROR_RETURN; | |
288 | } | |
289 | ||
290 | /* Read the file in one go in order to minimize the time we have it open. */ | |
291 | ||
292 | filebuf = store_get(statbuf.st_size + 1); | |
293 | ||
294 | if (fread(filebuf, 1, statbuf.st_size, fwd) != statbuf.st_size) | |
295 | { | |
296 | *error = string_sprintf("error while reading %s: %s", | |
297 | filename, strerror(errno)); | |
298 | goto ERROR_RETURN; | |
299 | } | |
300 | filebuf[statbuf.st_size] = 0; | |
301 | ||
059ec3d9 | 302 | DEBUG(D_route) |
b1c749bb | 303 | debug_printf(OFF_T_FMT " bytes read from %s\n", statbuf.st_size, filename); |
059ec3d9 | 304 | |
f1e894f3 | 305 | (void)fclose(fwd); |
059ec3d9 PH |
306 | return filebuf; |
307 | ||
308 | /* Return an error: the string is already set up. */ | |
309 | ||
310 | ERROR_RETURN: | |
311 | *yield = FF_ERROR; | |
f1e894f3 | 312 | (void)fclose(fwd); |
059ec3d9 PH |
313 | return NULL; |
314 | } | |
315 | ||
316 | ||
317 | ||
318 | /************************************************* | |
319 | * Extract info from list or filter * | |
320 | *************************************************/ | |
321 | ||
322 | /* This function calls the appropriate function to extract addresses from a | |
323 | forwarding list, or to run a filter file and get addresses from there. | |
324 | ||
325 | Arguments: | |
326 | rdata the redirection block | |
327 | options the options bits | |
328 | include_directory restrain to this directory | |
329 | sieve_vacation_directory passed to sieve_interpret | |
e4a89c47 PH |
330 | sieve_useraddress passed to sieve_interpret |
331 | sieve_subaddress passed to sieve_interpret | |
059ec3d9 PH |
332 | generated where to hang generated addresses |
333 | error for error messages | |
334 | eblockp for details of skipped syntax errors | |
335 | (NULL => no skip) | |
336 | filtertype set to the filter type: | |
337 | FILTER_FORWARD => a traditional .forward file | |
338 | FILTER_EXIM => an Exim filter file | |
339 | FILTER_SIEVE => a Sieve filter file | |
340 | a system filter is always forced to be FILTER_EXIM | |
341 | ||
342 | Returns: a suitable return for rda_interpret() | |
343 | */ | |
344 | ||
345 | static int | |
346 | rda_extract(redirect_block *rdata, int options, uschar *include_directory, | |
e4a89c47 PH |
347 | uschar *sieve_vacation_directory, uschar *sieve_useraddress, |
348 | uschar *sieve_subaddress, address_item **generated, uschar **error, | |
059ec3d9 PH |
349 | error_block **eblockp, int *filtertype) |
350 | { | |
351 | uschar *data; | |
352 | ||
353 | if (rdata->isfile) | |
354 | { | |
91ecef39 | 355 | int yield = 0; |
059ec3d9 PH |
356 | data = rda_get_file_contents(rdata, options, error, &yield); |
357 | if (data == NULL) return yield; | |
358 | } | |
359 | else data = rdata->string; | |
360 | ||
361 | *filtertype = system_filtering? FILTER_EXIM : rda_is_filter(data); | |
362 | ||
363 | /* Filter interpretation is done by a general function that is also called from | |
364 | the filter testing option (-bf). There are two versions: one for Exim filtering | |
365 | and one for Sieve filtering. Several features of string expansion may be locked | |
366 | out at sites that don't trust users. This is done by setting flags in | |
367 | expand_forbid that the expander inspects. */ | |
368 | ||
369 | if (*filtertype != FILTER_FORWARD) | |
370 | { | |
371 | int frc; | |
372 | int old_expand_forbid = expand_forbid; | |
373 | ||
23c7ff99 PH |
374 | DEBUG(D_route) debug_printf("data is %s filter program\n", |
375 | (*filtertype == FILTER_EXIM)? "an Exim" : "a Sieve"); | |
376 | ||
377 | /* RDO_FILTER is an "allow" bit */ | |
8e669ac1 | 378 | |
059ec3d9 PH |
379 | if ((options & RDO_FILTER) == 0) |
380 | { | |
381 | *error = US"filtering not enabled"; | |
382 | return FF_ERROR; | |
383 | } | |
384 | ||
059ec3d9 PH |
385 | expand_forbid = |
386 | (expand_forbid & ~RDO_FILTER_EXPANSIONS) | | |
387 | (options & RDO_FILTER_EXPANSIONS); | |
8e669ac1 | 388 | |
23c7ff99 | 389 | /* RDO_{EXIM,SIEVE}_FILTER are forbid bits */ |
8e669ac1 | 390 | |
23c7ff99 PH |
391 | if (*filtertype == FILTER_EXIM) |
392 | { | |
393 | if ((options & RDO_EXIM_FILTER) != 0) | |
394 | { | |
395 | *error = US"Exim filtering not enabled"; | |
396 | return FF_ERROR; | |
8e669ac1 | 397 | } |
23c7ff99 | 398 | frc = filter_interpret(data, options, generated, error); |
8e669ac1 | 399 | } |
23c7ff99 PH |
400 | else |
401 | { | |
402 | if ((options & RDO_SIEVE_FILTER) != 0) | |
403 | { | |
404 | *error = US"Sieve filtering not enabled"; | |
405 | return FF_ERROR; | |
406 | } | |
e4a89c47 PH |
407 | frc = sieve_interpret(data, options, sieve_vacation_directory, |
408 | sieve_useraddress, sieve_subaddress, generated, error); | |
8e669ac1 | 409 | } |
059ec3d9 PH |
410 | |
411 | expand_forbid = old_expand_forbid; | |
412 | return frc; | |
413 | } | |
414 | ||
415 | /* Not a filter script */ | |
416 | ||
417 | DEBUG(D_route) debug_printf("file is not a filter file\n"); | |
418 | ||
419 | return parse_forward_list(data, | |
420 | options, /* specials that are allowed */ | |
421 | generated, /* where to hang them */ | |
422 | error, /* for errors */ | |
423 | deliver_domain, /* to qualify \name */ | |
424 | include_directory, /* restrain to directory */ | |
425 | eblockp); /* for skipped syntax errors */ | |
426 | } | |
427 | ||
428 | ||
429 | ||
430 | ||
431 | /************************************************* | |
432 | * Write string down pipe * | |
433 | *************************************************/ | |
434 | ||
435 | /* This function is used for tranferring a string down a pipe between | |
436 | processes. If the pointer is NULL, a length of zero is written. | |
437 | ||
438 | Arguments: | |
439 | fd the pipe | |
440 | s the string | |
441 | ||
442 | Returns: nothing | |
443 | */ | |
444 | ||
445 | static void | |
446 | rda_write_string(int fd, uschar *s) | |
447 | { | |
448 | int len = (s == NULL)? 0 : Ustrlen(s) + 1; | |
f1e894f3 PH |
449 | (void)write(fd, &len, sizeof(int)); |
450 | if (s != NULL) (void)write(fd, s, len); | |
059ec3d9 PH |
451 | } |
452 | ||
453 | ||
454 | ||
455 | /************************************************* | |
456 | * Read string from pipe * | |
457 | *************************************************/ | |
458 | ||
459 | /* This function is used for receiving a string from a pipe. | |
460 | ||
461 | Arguments: | |
462 | fd the pipe | |
463 | sp where to put the string | |
464 | ||
465 | Returns: FALSE if data missing | |
466 | */ | |
467 | ||
468 | static BOOL | |
469 | rda_read_string(int fd, uschar **sp) | |
470 | { | |
471 | int len; | |
472 | ||
473 | if (read(fd, &len, sizeof(int)) != sizeof(int)) return FALSE; | |
474 | if (len == 0) *sp = NULL; else | |
475 | { | |
476 | *sp = store_get(len); | |
477 | if (read(fd, *sp, len) != len) return FALSE; | |
478 | } | |
479 | return TRUE; | |
480 | } | |
481 | ||
482 | ||
483 | ||
484 | /************************************************* | |
485 | * Interpret forward list or filter * | |
486 | *************************************************/ | |
487 | ||
488 | /* This function is passed a forward list string (unexpanded) or the name of a | |
489 | file (unexpanded) whose contents are the forwarding list. The list may in fact | |
490 | be a filter program if it starts with "#Exim filter" or "#Sieve filter". Other | |
491 | types of filter, with different inital tag strings, may be introduced in due | |
492 | course. | |
493 | ||
494 | The job of the function is to process the forwarding list or filter. It is | |
495 | pulled out into this separate function, because it is used for system filter | |
496 | files as well as from the redirect router. | |
497 | ||
498 | If the function is given a uid/gid, it runs a subprocess that passes the | |
499 | results back via a pipe. This provides security for things like :include:s in | |
500 | users' .forward files, and "logwrite" calls in users' filter files. A | |
501 | sub-process is NOT used when: | |
502 | ||
503 | . No uid/gid is provided | |
504 | . The input is a string which is not a filter string, and does not contain | |
505 | :include: | |
506 | . The input is a file whose non-existence can be detected in the main | |
507 | process (which is usually running as root). | |
508 | ||
509 | Arguments: | |
510 | rdata redirect data (file + constraints, or data string) | |
511 | options options to pass to the extraction functions, | |
512 | plus ENOTDIR and EACCES handling bits | |
513 | include_directory restrain :include: to this directory | |
514 | sieve_vacation_directory directory passed to sieve_interpret() | |
e4a89c47 PH |
515 | sieve_useraddress passed to sieve_interpret |
516 | sieve_subaddress passed to sieve_interpret | |
059ec3d9 PH |
517 | ugid uid/gid to run under - if NULL, no change |
518 | generated where to hang generated addresses, initially NULL | |
519 | error pointer for error message | |
520 | eblockp for skipped syntax errors; NULL if no skipping | |
521 | filtertype set to the type of file: | |
522 | FILTER_FORWARD => traditional .forward file | |
523 | FILTER_EXIM => an Exim filter file | |
524 | FILTER_SIEVE => a Sieve filter file | |
525 | a system filter is always forced to be FILTER_EXIM | |
526 | rname router name for error messages in the format | |
527 | "xxx router" or "system filter" | |
528 | ||
529 | Returns: values from extraction function, or FF_NONEXIST: | |
530 | FF_DELIVERED success, a significant action was taken | |
531 | FF_NOTDELIVERED success, no significant action | |
532 | FF_BLACKHOLE :blackhole: | |
533 | FF_DEFER defer requested | |
534 | FF_FAIL fail requested | |
535 | FF_INCLUDEFAIL some problem with :include: | |
536 | FF_FREEZE freeze requested | |
537 | FF_ERROR there was a problem | |
538 | FF_NONEXIST the file does not exist | |
539 | */ | |
540 | ||
541 | int | |
542 | rda_interpret(redirect_block *rdata, int options, uschar *include_directory, | |
e4a89c47 PH |
543 | uschar *sieve_vacation_directory, uschar *sieve_useraddress, |
544 | uschar *sieve_subaddress, ugid_block *ugid, address_item **generated, | |
059ec3d9 PH |
545 | uschar **error, error_block **eblockp, int *filtertype, uschar *rname) |
546 | { | |
547 | int fd, rc, pfd[2]; | |
548 | int yield, status; | |
549 | BOOL had_disaster = FALSE; | |
550 | pid_t pid; | |
551 | uschar *data; | |
552 | uschar *readerror = US""; | |
553 | void (*oldsignal)(int); | |
554 | ||
555 | DEBUG(D_route) debug_printf("rda_interpret (%s): %s\n", | |
556 | (rdata->isfile)? "file" : "string", rdata->string); | |
557 | ||
558 | /* Do the expansions of the file name or data first, while still privileged. */ | |
559 | ||
560 | data = expand_string(rdata->string); | |
561 | if (data == NULL) | |
562 | { | |
563 | if (expand_string_forcedfail) return FF_NOTDELIVERED; | |
564 | *error = string_sprintf("failed to expand \"%s\": %s", rdata->string, | |
565 | expand_string_message); | |
566 | return FF_ERROR; | |
567 | } | |
568 | rdata->string = data; | |
569 | ||
570 | DEBUG(D_route) debug_printf("expanded: %s\n", data); | |
571 | ||
572 | if (rdata->isfile && data[0] != '/') | |
573 | { | |
574 | *error = string_sprintf("\"%s\" is not an absolute path", data); | |
575 | return FF_ERROR; | |
576 | } | |
577 | ||
578 | /* If no uid/gid are supplied, or if we have a data string which does not start | |
579 | with #Exim filter or #Sieve filter, and does not contain :include:, do all the | |
580 | work in this process. Note that for a system filter, we always have a file, so | |
581 | the work is done in this process only if no user is supplied. */ | |
582 | ||
583 | if (!ugid->uid_set || /* Either there's no uid, or */ | |
584 | (!rdata->isfile && /* We've got the data, and */ | |
585 | rda_is_filter(data) == FILTER_FORWARD && /* It's not a filter script, */ | |
586 | Ustrstr(data, ":include:") == NULL)) /* and there's no :include: */ | |
587 | { | |
588 | return rda_extract(rdata, options, include_directory, | |
e4a89c47 PH |
589 | sieve_vacation_directory, sieve_useraddress, sieve_subaddress, |
590 | generated, error, eblockp, filtertype); | |
059ec3d9 PH |
591 | } |
592 | ||
593 | /* We need to run the processing code in a sub-process. However, if we can | |
594 | determine the non-existence of a file first, we can decline without having to | |
595 | create the sub-process. */ | |
596 | ||
597 | if (rdata->isfile && rda_exists(data, error) == FILE_NOT_EXIST) | |
598 | return FF_NONEXIST; | |
599 | ||
600 | /* If the file does exist, or we can't tell (non-root mounted NFS directory) | |
601 | we have to create the subprocess to do everything as the given user. The | |
602 | results of processing are passed back via a pipe. */ | |
603 | ||
604 | if (pipe(pfd) != 0) | |
605 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "creation of pipe for filter or " | |
606 | ":include: failed for %s: %s", rname, strerror(errno)); | |
607 | ||
608 | /* Ensure that SIGCHLD is set to SIG_DFL before forking, so that the child | |
609 | process can be waited for. We sometimes get here with it set otherwise. Save | |
af46795e PH |
610 | the old state for resetting on the wait. Ensure that all cached resources are |
611 | freed so that the subprocess starts with a clean slate and doesn't interfere | |
612 | with the parent process. */ | |
059ec3d9 PH |
613 | |
614 | oldsignal = signal(SIGCHLD, SIG_DFL); | |
af46795e PH |
615 | search_tidyup(); |
616 | ||
059ec3d9 PH |
617 | if ((pid = fork()) == 0) |
618 | { | |
619 | header_line *waslast = header_last; /* Save last header */ | |
620 | ||
621 | fd = pfd[pipe_write]; | |
f1e894f3 | 622 | (void)close(pfd[pipe_read]); |
059ec3d9 PH |
623 | exim_setugid(ugid->uid, ugid->gid, FALSE, rname); |
624 | ||
625 | /* Addresses can get rewritten in filters; if we are not root or the exim | |
626 | user (and we probably are not), turn off rewrite logging, because we cannot | |
627 | write to the log now. */ | |
628 | ||
629 | if (ugid->uid != root_uid && ugid->uid != exim_uid) | |
630 | { | |
631 | DEBUG(D_rewrite) debug_printf("turned off address rewrite logging (not " | |
632 | "root or exim in this process)\n"); | |
633 | log_write_selector &= ~L_address_rewrite; | |
634 | } | |
635 | ||
636 | /* Now do the business */ | |
637 | ||
638 | yield = rda_extract(rdata, options, include_directory, | |
e4a89c47 PH |
639 | sieve_vacation_directory, sieve_useraddress, sieve_subaddress, generated, |
640 | error, eblockp, filtertype); | |
059ec3d9 PH |
641 | |
642 | /* Pass back whether it was a filter, and the return code and any overall | |
643 | error text via the pipe. */ | |
644 | ||
f1e894f3 PH |
645 | (void)write(fd, filtertype, sizeof(int)); |
646 | (void)write(fd, &yield, sizeof(int)); | |
059ec3d9 PH |
647 | rda_write_string(fd, *error); |
648 | ||
649 | /* Pass back the contents of any syntax error blocks if we have a pointer */ | |
650 | ||
651 | if (eblockp != NULL) | |
652 | { | |
653 | error_block *ep; | |
654 | for (ep = *eblockp; ep != NULL; ep = ep->next) | |
655 | { | |
656 | rda_write_string(fd, ep->text1); | |
657 | rda_write_string(fd, ep->text2); | |
658 | } | |
659 | rda_write_string(fd, NULL); /* Indicates end of eblocks */ | |
660 | } | |
661 | ||
662 | /* If this is a system filter, we have to pass back the numbers of any | |
663 | original header lines that were removed, and then any header lines that were | |
664 | added but not subsequently removed. */ | |
665 | ||
666 | if (system_filtering) | |
667 | { | |
668 | int i = 0; | |
669 | header_line *h; | |
670 | for (h = header_list; h != waslast->next; i++, h = h->next) | |
671 | { | |
f1e894f3 | 672 | if (h->type == htype_old) (void)write(fd, &i, sizeof(i)); |
059ec3d9 PH |
673 | } |
674 | i = -1; | |
f1e894f3 | 675 | (void)write(fd, &i, sizeof(i)); |
059ec3d9 PH |
676 | |
677 | while (waslast != header_last) | |
678 | { | |
679 | waslast = waslast->next; | |
680 | if (waslast->type != htype_old) | |
681 | { | |
682 | rda_write_string(fd, waslast->text); | |
f1e894f3 | 683 | (void)write(fd, &(waslast->type), sizeof(waslast->type)); |
059ec3d9 PH |
684 | } |
685 | } | |
686 | rda_write_string(fd, NULL); /* Indicates end of added headers */ | |
687 | } | |
688 | ||
689 | /* Write the contents of the $n variables */ | |
690 | ||
f1e894f3 | 691 | (void)write(fd, filter_n, sizeof(filter_n)); |
059ec3d9 PH |
692 | |
693 | /* If the result was DELIVERED or NOTDELIVERED, we pass back the generated | |
694 | addresses, and their associated information, through the pipe. This is | |
695 | just tedious, but it seems to be the only safe way. We do this also for | |
696 | FAIL and FREEZE, because a filter is allowed to set up deliveries that | |
697 | are honoured before freezing or failing. */ | |
698 | ||
699 | if (yield == FF_DELIVERED || yield == FF_NOTDELIVERED || | |
700 | yield == FF_FAIL || yield == FF_FREEZE) | |
701 | { | |
702 | address_item *addr; | |
703 | for (addr = *generated; addr != NULL; addr = addr->next) | |
704 | { | |
705 | int reply_options = 0; | |
706 | ||
707 | rda_write_string(fd, addr->address); | |
f1e894f3 PH |
708 | (void)write(fd, &(addr->mode), sizeof(addr->mode)); |
709 | (void)write(fd, &(addr->flags), sizeof(addr->flags)); | |
059ec3d9 PH |
710 | rda_write_string(fd, addr->p.errors_address); |
711 | ||
712 | if (addr->pipe_expandn != NULL) | |
713 | { | |
714 | uschar **pp; | |
715 | for (pp = addr->pipe_expandn; *pp != NULL; pp++) | |
716 | rda_write_string(fd, *pp); | |
717 | } | |
718 | rda_write_string(fd, NULL); | |
719 | ||
720 | if (addr->reply == NULL) | |
f1e894f3 | 721 | (void)write(fd, &reply_options, sizeof(int)); /* 0 means no reply */ |
059ec3d9 PH |
722 | else |
723 | { | |
724 | reply_options |= REPLY_EXISTS; | |
725 | if (addr->reply->file_expand) reply_options |= REPLY_EXPAND; | |
726 | if (addr->reply->return_message) reply_options |= REPLY_RETURN; | |
f1e894f3 PH |
727 | (void)write(fd, &reply_options, sizeof(int)); |
728 | (void)write(fd, &(addr->reply->expand_forbid), sizeof(int)); | |
729 | (void)write(fd, &(addr->reply->once_repeat), sizeof(time_t)); | |
059ec3d9 PH |
730 | rda_write_string(fd, addr->reply->to); |
731 | rda_write_string(fd, addr->reply->cc); | |
732 | rda_write_string(fd, addr->reply->bcc); | |
733 | rda_write_string(fd, addr->reply->from); | |
734 | rda_write_string(fd, addr->reply->reply_to); | |
735 | rda_write_string(fd, addr->reply->subject); | |
736 | rda_write_string(fd, addr->reply->headers); | |
737 | rda_write_string(fd, addr->reply->text); | |
738 | rda_write_string(fd, addr->reply->file); | |
739 | rda_write_string(fd, addr->reply->logfile); | |
740 | rda_write_string(fd, addr->reply->oncelog); | |
741 | } | |
742 | } | |
743 | ||
744 | rda_write_string(fd, NULL); /* Marks end of addresses */ | |
745 | } | |
746 | ||
af46795e PH |
747 | /* OK, this process is now done. Free any cached resources. Must use _exit() |
748 | and not exit() !! */ | |
059ec3d9 | 749 | |
f1e894f3 | 750 | (void)close(fd); |
af46795e | 751 | search_tidyup(); |
059ec3d9 PH |
752 | _exit(0); |
753 | } | |
754 | ||
755 | /* Back in the main process: panic if the fork did not succeed. */ | |
756 | ||
757 | if (pid < 0) | |
758 | log_write(0, LOG_MAIN|LOG_PANIC_DIE, "fork failed for %s", rname); | |
759 | ||
760 | /* Read the pipe to get the data from the filter/forward. Our copy of the | |
761 | writing end must be closed first, as otherwise read() won't return zero on an | |
762 | empty pipe. Afterwards, close the reading end. */ | |
763 | ||
f1e894f3 | 764 | (void)close(pfd[pipe_write]); |
059ec3d9 PH |
765 | |
766 | /* Read initial data, including yield and contents of *error */ | |
767 | ||
768 | fd = pfd[pipe_read]; | |
769 | if (read(fd, filtertype, sizeof(int)) != sizeof(int) || | |
770 | read(fd, &yield, sizeof(int)) != sizeof(int) || | |
771 | !rda_read_string(fd, error)) goto DISASTER; | |
772 | ||
059ec3d9 PH |
773 | /* Read the contents of any syntax error blocks if we have a pointer */ |
774 | ||
775 | if (eblockp != NULL) | |
776 | { | |
777 | uschar *s; | |
778 | error_block *e; | |
779 | error_block **p = eblockp; | |
780 | for (;;) | |
781 | { | |
782 | if (!rda_read_string(fd, &s)) goto DISASTER; | |
783 | if (s == NULL) break; | |
784 | e = store_get(sizeof(error_block)); | |
785 | e->next = NULL; | |
786 | e->text1 = s; | |
787 | if (!rda_read_string(fd, &s)) goto DISASTER; | |
788 | e->text2 = s; | |
789 | *p = e; | |
790 | p = &(e->next); | |
791 | } | |
792 | } | |
793 | ||
794 | /* If this is a system filter, read the identify of any original header lines | |
795 | that were removed, and then read data for any new ones that were added. */ | |
796 | ||
797 | if (system_filtering) | |
798 | { | |
799 | int hn = 0; | |
800 | header_line *h = header_list; | |
801 | ||
802 | for (;;) | |
803 | { | |
804 | int n; | |
805 | if (read(fd, &n, sizeof(int)) != sizeof(int)) goto DISASTER; | |
806 | if (n < 0) break; | |
807 | while (hn < n) | |
808 | { | |
809 | hn++; | |
810 | h = h->next; | |
811 | if (h == NULL) goto DISASTER_NO_HEADER; | |
812 | } | |
813 | h->type = htype_old; | |
814 | } | |
815 | ||
816 | for (;;) | |
817 | { | |
818 | uschar *s; | |
819 | int type; | |
820 | if (!rda_read_string(fd, &s)) goto DISASTER; | |
821 | if (s == NULL) break; | |
822 | if (read(fd, &type, sizeof(type)) != sizeof(type)) goto DISASTER; | |
823 | header_add(type, "%s", s); | |
824 | } | |
825 | } | |
826 | ||
827 | /* Read the values of the $n variables */ | |
828 | ||
829 | if (read(fd, filter_n, sizeof(filter_n)) != sizeof(filter_n)) goto DISASTER; | |
830 | ||
831 | /* If the yield is DELIVERED, NOTDELIVERED, FAIL, or FREEZE there may follow | |
832 | addresses and data to go with them. Keep them in the same order in the | |
833 | generated chain. */ | |
834 | ||
835 | if (yield == FF_DELIVERED || yield == FF_NOTDELIVERED || | |
836 | yield == FF_FAIL || yield == FF_FREEZE) | |
837 | { | |
838 | address_item **nextp = generated; | |
839 | ||
840 | for (;;) | |
841 | { | |
842 | int i, reply_options; | |
843 | address_item *addr; | |
844 | uschar *recipient; | |
845 | uschar *expandn[EXPAND_MAXN + 2]; | |
846 | ||
847 | /* First string is the address; NULL => end of addresses */ | |
848 | ||
849 | if (!rda_read_string(fd, &recipient)) goto DISASTER; | |
850 | if (recipient == NULL) break; | |
851 | ||
852 | /* Hang on the end of the chain */ | |
853 | ||
854 | addr = deliver_make_addr(recipient, FALSE); | |
855 | *nextp = addr; | |
856 | nextp = &(addr->next); | |
857 | ||
858 | /* Next comes the mode and the flags fields */ | |
859 | ||
860 | if (read(fd, &(addr->mode), sizeof(addr->mode)) != sizeof(addr->mode) || | |
861 | read(fd, &(addr->flags), sizeof(addr->flags)) != sizeof(addr->flags) || | |
862 | !rda_read_string(fd, &(addr->p.errors_address))) goto DISASTER; | |
863 | ||
864 | /* Next comes a possible setting for $thisaddress and any numerical | |
865 | variables for pipe expansion, terminated by a NULL string. The maximum | |
866 | number of numericals is EXPAND_MAXN. Note that we put filter_thisaddress | |
867 | into the zeroth item in the vector - this is sorted out inside the pipe | |
868 | transport. */ | |
869 | ||
870 | for (i = 0; i < EXPAND_MAXN + 1; i++) | |
871 | { | |
872 | uschar *temp; | |
873 | if (!rda_read_string(fd, &temp)) goto DISASTER; | |
874 | if (i == 0) filter_thisaddress = temp; /* Just in case */ | |
875 | expandn[i] = temp; | |
876 | if (temp == NULL) break; | |
877 | } | |
878 | ||
879 | if (i > 0) | |
880 | { | |
881 | addr->pipe_expandn = store_get((i+1) * sizeof(uschar **)); | |
882 | addr->pipe_expandn[i] = NULL; | |
883 | while (--i >= 0) addr->pipe_expandn[i] = expandn[i]; | |
884 | } | |
885 | ||
886 | /* Then an int containing reply options; zero => no reply data. */ | |
887 | ||
888 | if (read(fd, &reply_options, sizeof(int)) != sizeof(int)) goto DISASTER; | |
889 | if ((reply_options & REPLY_EXISTS) != 0) | |
890 | { | |
891 | addr->reply = store_get(sizeof(reply_item)); | |
892 | ||
893 | addr->reply->file_expand = (reply_options & REPLY_EXPAND) != 0; | |
894 | addr->reply->return_message = (reply_options & REPLY_RETURN) != 0; | |
895 | ||
896 | if (read(fd,&(addr->reply->expand_forbid),sizeof(int)) != | |
897 | sizeof(int) || | |
898 | read(fd,&(addr->reply->once_repeat),sizeof(time_t)) != | |
899 | sizeof(time_t) || | |
900 | !rda_read_string(fd, &(addr->reply->to)) || | |
901 | !rda_read_string(fd, &(addr->reply->cc)) || | |
902 | !rda_read_string(fd, &(addr->reply->bcc)) || | |
903 | !rda_read_string(fd, &(addr->reply->from)) || | |
904 | !rda_read_string(fd, &(addr->reply->reply_to)) || | |
905 | !rda_read_string(fd, &(addr->reply->subject)) || | |
906 | !rda_read_string(fd, &(addr->reply->headers)) || | |
907 | !rda_read_string(fd, &(addr->reply->text)) || | |
908 | !rda_read_string(fd, &(addr->reply->file)) || | |
909 | !rda_read_string(fd, &(addr->reply->logfile)) || | |
910 | !rda_read_string(fd, &(addr->reply->oncelog))) | |
911 | goto DISASTER; | |
912 | } | |
913 | } | |
914 | } | |
915 | ||
916 | /* All data has been transferred from the sub-process. Reap it, close the | |
917 | reading end of the pipe, and we are done. */ | |
918 | ||
919 | WAIT_EXIT: | |
920 | while ((rc = wait(&status)) != pid) | |
921 | { | |
922 | if (rc < 0 && errno == ECHILD) /* Process has vanished */ | |
923 | { | |
924 | log_write(0, LOG_MAIN, "redirection process %d vanished unexpectedly", pid); | |
925 | goto FINAL_EXIT; | |
926 | } | |
927 | } | |
928 | ||
1921d2ea PH |
929 | DEBUG(D_route) |
930 | debug_printf("rda_interpret: subprocess yield=%d error=%s\n", yield, *error); | |
931 | ||
059ec3d9 PH |
932 | if (had_disaster) |
933 | { | |
934 | *error = string_sprintf("internal problem in %s: failure to transfer " | |
935 | "data from subprocess: status=%04x%s%s%s", rname, | |
936 | status, readerror, | |
937 | (*error == NULL)? US"" : US": error=", | |
938 | (*error == NULL)? US"" : *error); | |
939 | log_write(0, LOG_MAIN|LOG_PANIC, "%s", *error); | |
940 | } | |
941 | else if (status != 0) | |
942 | { | |
943 | log_write(0, LOG_MAIN|LOG_PANIC, "internal problem in %s: unexpected status " | |
944 | "%04x from redirect subprocess (but data correctly received)", rname, | |
945 | status); | |
946 | } | |
947 | ||
948 | FINAL_EXIT: | |
f1e894f3 | 949 | (void)close(fd); |
059ec3d9 PH |
950 | signal(SIGCHLD, oldsignal); /* restore */ |
951 | return yield; | |
952 | ||
953 | ||
954 | /* Come here if the data indicates removal of a header that we can't find */ | |
955 | ||
956 | DISASTER_NO_HEADER: | |
957 | readerror = US" readerror=bad header identifier"; | |
958 | had_disaster = TRUE; | |
959 | yield = FF_ERROR; | |
960 | goto WAIT_EXIT; | |
961 | ||
962 | /* Come here is there's a shambles in transferring the data over the pipe. The | |
963 | value of errno should still be set. */ | |
964 | ||
965 | DISASTER: | |
966 | readerror = string_sprintf(" readerror='%s'", strerror(errno)); | |
967 | had_disaster = TRUE; | |
968 | yield = FF_ERROR; | |
969 | goto WAIT_EXIT; | |
970 | } | |
971 | ||
972 | /* End of rda.c */ |