Commit | Line | Data |
---|---|---|
420a0d19 CE |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
5 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004 */ | |
6 | /* License: GPL */ | |
7 | ||
8 | #include "exim.h" | |
9 | #ifdef WITH_CONTENT_SCAN /* entire file */ | |
10 | #include "mime.h" | |
11 | #include <sys/stat.h> | |
12 | ||
13 | FILE *mime_stream = NULL; | |
14 | uschar *mime_current_boundary = NULL; | |
15 | ||
16 | /************************************************* | |
17 | * set MIME anomaly level + text * | |
18 | *************************************************/ | |
19 | ||
20 | /* Small wrapper to set the two expandables which | |
21 | give info on detected "problems" in MIME | |
22 | encodings. Those are defined in mime.h. */ | |
23 | ||
24 | void | |
25 | mime_set_anomaly(int level, const char *text) | |
26 | { | |
27 | mime_anomaly_level = level; | |
28 | mime_anomaly_text = CUS text; | |
29 | } | |
30 | ||
31 | ||
32 | /************************************************* | |
33 | * decode quoted-printable chars * | |
34 | *************************************************/ | |
35 | ||
36 | /* gets called when we hit a = | |
37 | returns: new pointer position | |
38 | result code in c: | |
39 | -2 - decode error | |
40 | -1 - soft line break, no char | |
41 | 0-255 - char to write | |
42 | */ | |
43 | ||
44 | uschar * | |
45 | mime_decode_qp_char(uschar *qp_p, int *c) | |
46 | { | |
47 | uschar *initial_pos = qp_p; | |
48 | ||
49 | /* advance one char */ | |
50 | qp_p++; | |
51 | ||
52 | /* Check for two hex digits and decode them */ | |
53 | if (isxdigit(*qp_p) && isxdigit(qp_p[1])) | |
54 | { | |
55 | /* Do hex conversion */ | |
56 | *c = (isdigit(*qp_p) ? *qp_p - '0' : toupper(*qp_p) - 'A' + 10) <<4; | |
57 | qp_p++; | |
58 | *c |= isdigit(*qp_p) ? *qp_p - '0' : toupper(*qp_p) - 'A' + 10; | |
59 | return qp_p + 1; | |
60 | } | |
61 | ||
62 | /* tab or whitespace may follow just ignore it if it precedes \n */ | |
63 | while (*qp_p == '\t' || *qp_p == ' ' || *qp_p == '\r') | |
64 | qp_p++; | |
65 | ||
66 | if (*qp_p == '\n') /* hit soft line break */ | |
67 | { | |
68 | *c = -1; | |
69 | return qp_p; | |
70 | } | |
71 | ||
72 | /* illegal char here */ | |
73 | *c = -2; | |
74 | return initial_pos; | |
75 | } | |
76 | ||
77 | ||
78 | /* just dump MIME part without any decoding */ | |
79 | static ssize_t | |
80 | mime_decode_asis(FILE* in, FILE* out, uschar* boundary) | |
81 | { | |
82 | ssize_t len, size = 0; | |
83 | uschar buffer[MIME_MAX_LINE_LENGTH]; | |
84 | ||
85 | while(fgets(CS buffer, MIME_MAX_LINE_LENGTH, mime_stream) != NULL) | |
86 | { | |
87 | if (boundary != NULL | |
88 | && Ustrncmp(buffer, "--", 2) == 0 | |
89 | && Ustrncmp((buffer+2), boundary, Ustrlen(boundary)) == 0 | |
90 | ) | |
91 | break; | |
92 | ||
93 | len = Ustrlen(buffer); | |
94 | if (fwrite(buffer, 1, (size_t)len, out) < len) | |
95 | return -1; | |
96 | size += len; | |
97 | } /* while */ | |
98 | return size; | |
99 | } | |
100 | ||
101 | ||
102 | /* decode base64 MIME part */ | |
103 | static ssize_t | |
104 | mime_decode_base64(FILE* in, FILE* out, uschar* boundary) | |
105 | { | |
106 | uschar ibuf[MIME_MAX_LINE_LENGTH], obuf[MIME_MAX_LINE_LENGTH]; | |
107 | uschar *ipos, *opos; | |
108 | ssize_t len, size = 0; | |
109 | int bytestate = 0; | |
110 | ||
111 | opos = obuf; | |
112 | ||
113 | while (Ufgets(ibuf, MIME_MAX_LINE_LENGTH, in) != NULL) | |
114 | { | |
115 | if (boundary != NULL | |
116 | && Ustrncmp(ibuf, "--", 2) == 0 | |
117 | && Ustrncmp((ibuf+2), boundary, Ustrlen(boundary)) == 0 | |
118 | ) | |
119 | break; | |
120 | ||
121 | for (ipos = ibuf ; *ipos != '\r' && *ipos != '\n' && *ipos != 0; ++ipos) | |
122 | { | |
123 | if (*ipos == '=') /* skip padding */ | |
124 | { | |
125 | ++bytestate; | |
126 | continue; | |
127 | } | |
128 | if (mime_b64[*ipos] == 128) /* skip bad characters */ | |
129 | { | |
130 | mime_set_anomaly(MIME_ANOMALY_BROKEN_BASE64); | |
131 | continue; | |
132 | } | |
133 | ||
134 | /* simple state-machine */ | |
135 | switch((bytestate++) & 3) | |
136 | { | |
137 | case 0: | |
138 | *opos = mime_b64[*ipos] << 2; | |
139 | break; | |
140 | case 1: | |
141 | *opos |= mime_b64[*ipos] >> 4; | |
142 | ++opos; | |
143 | *opos = mime_b64[*ipos] << 4; | |
144 | break; | |
145 | case 2: | |
146 | *opos |= mime_b64[*ipos] >> 2; | |
147 | ++opos; | |
148 | *opos = mime_b64[*ipos] << 6; | |
149 | break; | |
150 | case 3: | |
151 | *opos |= mime_b64[*ipos]; | |
152 | ++opos; | |
153 | break; | |
154 | } /* switch */ | |
155 | } /* for */ | |
156 | ||
157 | /* something to write? */ | |
158 | len = opos - obuf; | |
159 | if (len > 0) | |
160 | { | |
161 | if (fwrite(obuf, 1, len, out) != len) return -1; /* error */ | |
162 | size += len; | |
163 | /* copy incomplete last byte to start of obuf, where we continue */ | |
164 | if ((bytestate & 3) != 0) | |
165 | *obuf = *opos; | |
166 | opos = obuf; | |
167 | } | |
168 | } /* while */ | |
169 | ||
170 | /* write out last byte if it was incomplete */ | |
171 | if (bytestate & 3) | |
172 | { | |
173 | if (fwrite(obuf, 1, 1, out) != 1) return -1; | |
174 | ++size; | |
175 | } | |
176 | ||
177 | return size; | |
178 | } | |
179 | ||
180 | ||
181 | /* decode quoted-printable MIME part */ | |
182 | static ssize_t | |
183 | mime_decode_qp(FILE* in, FILE* out, uschar* boundary) | |
184 | { | |
185 | uschar ibuf[MIME_MAX_LINE_LENGTH], obuf[MIME_MAX_LINE_LENGTH]; | |
186 | uschar *ipos, *opos; | |
187 | ssize_t len, size = 0; | |
188 | ||
189 | while (fgets(CS ibuf, MIME_MAX_LINE_LENGTH, in) != NULL) | |
190 | { | |
191 | if (boundary != NULL | |
192 | && Ustrncmp(ibuf, "--", 2) == 0 | |
193 | && Ustrncmp((ibuf+2), boundary, Ustrlen(boundary)) == 0 | |
194 | ) | |
195 | break; /* todo: check for missing boundary */ | |
196 | ||
197 | ipos = ibuf; | |
198 | opos = obuf; | |
199 | ||
200 | while (*ipos != 0) | |
201 | { | |
202 | if (*ipos == '=') | |
203 | { | |
204 | int decode_qp_result; | |
205 | ||
206 | ipos = mime_decode_qp_char(ipos, &decode_qp_result); | |
207 | ||
208 | if (decode_qp_result == -2) | |
209 | { | |
210 | /* Error from decoder. ipos is unchanged. */ | |
211 | mime_set_anomaly(MIME_ANOMALY_BROKEN_QP); | |
212 | *opos = '='; | |
213 | ++opos; | |
214 | ++ipos; | |
215 | } | |
216 | else if (decode_qp_result == -1) | |
217 | break; | |
218 | else if (decode_qp_result >= 0) | |
219 | { | |
220 | *opos = decode_qp_result; | |
221 | ++opos; | |
222 | } | |
223 | } | |
224 | else | |
225 | { | |
226 | *opos = *ipos; | |
227 | ++opos; | |
228 | ++ipos; | |
229 | } | |
230 | } | |
231 | /* something to write? */ | |
232 | len = opos - obuf; | |
233 | if (len > 0) | |
234 | { | |
235 | if (fwrite(obuf, 1, len, out) != len) return -1; /* error */ | |
236 | size += len; | |
237 | } | |
238 | } | |
239 | return size; | |
240 | } | |
241 | ||
242 | ||
243 | FILE * | |
244 | mime_get_decode_file(uschar *pname, uschar *fname) | |
245 | { | |
246 | FILE *f = NULL; | |
247 | uschar *filename; | |
248 | ||
249 | filename = (uschar *)malloc(2048); | |
250 | ||
251 | if (pname && fname) | |
252 | { | |
253 | (void)string_format(filename, 2048, "%s/%s", pname, fname); | |
254 | f = modefopen(filename,"wb+",SPOOL_MODE); | |
255 | } | |
256 | else if (!pname) | |
257 | f = modefopen(fname,"wb+",SPOOL_MODE); | |
258 | else if (!fname) | |
259 | { | |
260 | int file_nr = 0; | |
261 | int result = 0; | |
262 | ||
263 | /* must find first free sequential filename */ | |
264 | do | |
265 | { | |
266 | struct stat mystat; | |
267 | (void)string_format(filename, 2048, | |
268 | "%s/%s-%05u", pname, message_id, file_nr++); | |
269 | /* security break */ | |
270 | if (file_nr >= 1024) | |
271 | break; | |
272 | result = stat(CS filename, &mystat); | |
273 | } while(result != -1); | |
274 | ||
275 | f = modefopen(filename, "wb+", SPOOL_MODE); | |
276 | } | |
277 | ||
278 | /* set expansion variable */ | |
279 | mime_decoded_filename = filename; | |
280 | ||
281 | return f; | |
282 | } | |
283 | ||
284 | ||
285 | int | |
286 | mime_decode(uschar **listptr) | |
287 | { | |
288 | int sep = 0; | |
289 | uschar *list = *listptr; | |
290 | uschar *option; | |
291 | uschar option_buffer[1024]; | |
292 | uschar decode_path[1024]; | |
293 | FILE *decode_file = NULL; | |
294 | long f_pos = 0; | |
295 | ssize_t size_counter = 0; | |
296 | ssize_t (*decode_function)(FILE*, FILE*, uschar*); | |
297 | ||
298 | if (mime_stream == NULL) | |
299 | return FAIL; | |
300 | ||
301 | f_pos = ftell(mime_stream); | |
302 | ||
303 | /* build default decode path (will exist since MBOX must be spooled up) */ | |
304 | (void)string_format(decode_path,1024,"%s/scan/%s",spool_directory,message_id); | |
305 | ||
306 | /* try to find 1st option */ | |
307 | if ((option = string_nextinlist(&list, &sep, | |
308 | option_buffer, | |
309 | sizeof(option_buffer))) != NULL) | |
310 | { | |
311 | /* parse 1st option */ | |
312 | if ( (Ustrcmp(option,"false") == 0) || (Ustrcmp(option,"0") == 0) ) | |
313 | /* explicitly no decoding */ | |
314 | return FAIL; | |
315 | ||
316 | if (Ustrcmp(option,"default") == 0) | |
317 | /* explicit default path + file names */ | |
318 | goto DEFAULT_PATH; | |
319 | ||
320 | if (option[0] == '/') | |
321 | { | |
322 | struct stat statbuf; | |
323 | ||
324 | memset(&statbuf,0,sizeof(statbuf)); | |
325 | ||
326 | /* assume either path or path+file name */ | |
327 | if ( (stat(CS option, &statbuf) == 0) && S_ISDIR(statbuf.st_mode) ) | |
328 | /* is directory, use it as decode_path */ | |
329 | decode_file = mime_get_decode_file(option, NULL); | |
330 | else | |
331 | /* does not exist or is a file, use as full file name */ | |
332 | decode_file = mime_get_decode_file(NULL, option); | |
333 | } | |
334 | else | |
335 | /* assume file name only, use default path */ | |
336 | decode_file = mime_get_decode_file(decode_path, option); | |
337 | } | |
338 | else | |
339 | { | |
340 | /* no option? patch default path */ | |
341 | DEFAULT_PATH: | |
342 | decode_file = mime_get_decode_file(decode_path, NULL); | |
343 | } | |
344 | ||
345 | if (!decode_file) | |
346 | return DEFER; | |
347 | ||
348 | /* decode according to mime type */ | |
349 | decode_function = | |
350 | !mime_content_transfer_encoding | |
351 | ? mime_decode_asis /* no encoding, dump as-is */ | |
352 | : Ustrcmp(mime_content_transfer_encoding, "base64") == 0 | |
353 | ? mime_decode_base64 | |
354 | : Ustrcmp(mime_content_transfer_encoding, "quoted-printable") == 0 | |
355 | ? mime_decode_qp | |
356 | : mime_decode_asis; /* unknown encoding type, just dump as-is */ | |
357 | ||
358 | size_counter = decode_function(mime_stream, decode_file, mime_current_boundary); | |
359 | ||
360 | clearerr(mime_stream); | |
361 | fseek(mime_stream, f_pos, SEEK_SET); | |
362 | ||
363 | if (fclose(decode_file) != 0 || size_counter < 0) | |
364 | return DEFER; | |
365 | ||
366 | /* round up to the next KiB */ | |
367 | mime_content_size = (size_counter + 1023) / 1024; | |
368 | ||
369 | return OK; | |
370 | } | |
371 | ||
372 | int | |
373 | mime_get_header(FILE *f, uschar *header) | |
374 | { | |
375 | int c = EOF; | |
376 | int done = 0; | |
377 | int header_value_mode = 0; | |
378 | int header_open_brackets = 0; | |
379 | int num_copied = 0; | |
380 | ||
381 | while(!done) | |
382 | { | |
383 | if ((c = fgetc(f)) == EOF) break; | |
384 | ||
385 | /* always skip CRs */ | |
386 | if (c == '\r') continue; | |
387 | ||
388 | if (c == '\n') | |
389 | { | |
390 | if (num_copied > 0) | |
391 | { | |
392 | /* look if next char is '\t' or ' ' */ | |
393 | if ((c = fgetc(f)) == EOF) break; | |
394 | if ( (c == '\t') || (c == ' ') ) continue; | |
395 | (void)ungetc(c,f); | |
396 | } | |
397 | /* end of the header, terminate with ';' */ | |
398 | c = ';'; | |
399 | done = 1; | |
400 | } | |
401 | ||
402 | /* skip control characters */ | |
403 | if (c < 32) continue; | |
404 | ||
405 | if (header_value_mode) | |
406 | { | |
407 | /* --------- value mode ----------- */ | |
408 | /* skip leading whitespace */ | |
409 | if ( ((c == '\t') || (c == ' ')) && (header_value_mode == 1) ) | |
410 | continue; | |
411 | ||
412 | /* we have hit a non-whitespace char, start copying value data */ | |
413 | header_value_mode = 2; | |
414 | ||
415 | if (c == '"') /* flip "quoted" mode */ | |
416 | header_value_mode = header_value_mode==2 ? 3 : 2; | |
417 | ||
418 | /* leave value mode on unquoted ';' */ | |
419 | if (header_value_mode == 2 && c == ';') { | |
420 | header_value_mode = 0; | |
421 | }; | |
422 | /* -------------------------------- */ | |
423 | } | |
424 | else | |
425 | { | |
426 | /* -------- non-value mode -------- */ | |
427 | /* skip whitespace + tabs */ | |
428 | if ( (c == ' ') || (c == '\t') ) | |
429 | continue; | |
430 | if (c == '\\') | |
431 | { | |
432 | /* quote next char. can be used | |
433 | to escape brackets. */ | |
434 | if ((c = fgetc(f)) == EOF) break; | |
435 | } | |
436 | else if (c == '(') | |
437 | { | |
438 | header_open_brackets++; | |
439 | continue; | |
440 | } | |
441 | else if ((c == ')') && header_open_brackets) | |
442 | { | |
443 | header_open_brackets--; | |
444 | continue; | |
445 | } | |
446 | else if ( (c == '=') && !header_open_brackets ) /* enter value mode */ | |
447 | header_value_mode = 1; | |
448 | ||
449 | /* skip chars while we are in a comment */ | |
450 | if (header_open_brackets > 0) | |
451 | continue; | |
452 | /* -------------------------------- */ | |
453 | } | |
454 | ||
455 | /* copy the char to the buffer */ | |
456 | header[num_copied++] = (uschar)c; | |
457 | ||
458 | /* break if header buffer is full */ | |
459 | if (num_copied > MIME_MAX_HEADER_SIZE-1) | |
460 | done = 1; | |
461 | } | |
462 | ||
463 | if ((num_copied > 0) && (header[num_copied-1] != ';')) | |
464 | header[num_copied-1] = ';'; | |
465 | ||
466 | /* 0-terminate */ | |
467 | header[num_copied] = '\0'; | |
468 | ||
469 | /* return 0 for EOF or empty line */ | |
470 | if ((c == EOF) || (num_copied == 1)) | |
471 | return 0; | |
472 | else | |
473 | return 1; | |
474 | } | |
475 | ||
476 | ||
477 | int | |
478 | mime_acl_check(uschar *acl, FILE *f, struct mime_boundary_context *context, | |
479 | uschar **user_msgptr, uschar **log_msgptr) | |
480 | { | |
481 | int rc = OK; | |
482 | uschar *header = NULL; | |
483 | struct mime_boundary_context nested_context; | |
484 | ||
485 | /* reserve a line buffer to work in */ | |
486 | if (!(header = (uschar *)malloc(MIME_MAX_HEADER_SIZE+1))) | |
487 | { | |
488 | log_write(0, LOG_PANIC, | |
489 | "MIME ACL: can't allocate %d bytes of memory.", MIME_MAX_HEADER_SIZE+1); | |
490 | return DEFER; | |
491 | } | |
492 | ||
493 | /* Not actually used at the moment, but will be vital to fixing | |
494 | * some RFC 2046 nonconformance later... */ | |
495 | nested_context.parent = context; | |
496 | ||
497 | /* loop through parts */ | |
498 | while(1) | |
499 | { | |
500 | /* reset all per-part mime variables */ | |
501 | mime_anomaly_level = 0; | |
502 | mime_anomaly_text = NULL; | |
503 | mime_boundary = NULL; | |
504 | mime_charset = NULL; | |
505 | mime_decoded_filename = NULL; | |
506 | mime_filename = NULL; | |
507 | mime_content_description = NULL; | |
508 | mime_content_disposition = NULL; | |
509 | mime_content_id = NULL; | |
510 | mime_content_transfer_encoding = NULL; | |
511 | mime_content_type = NULL; | |
512 | mime_is_multipart = 0; | |
513 | mime_content_size = 0; | |
514 | ||
515 | /* | |
516 | If boundary is null, we assume that *f is positioned on the start of headers (for example, | |
517 | at the very beginning of a message. | |
518 | If a boundary is given, we must first advance to it to reach the start of the next header | |
519 | block. | |
520 | */ | |
521 | ||
522 | /* NOTE -- there's an error here -- RFC2046 specifically says to | |
523 | * check for outer boundaries. This code doesn't do that, and | |
524 | * I haven't fixed this. | |
525 | * | |
526 | * (I have moved partway towards adding support, however, by adding | |
527 | * a "parent" field to my new boundary-context structure.) | |
528 | */ | |
529 | if (context != NULL) | |
530 | { | |
531 | while(fgets(CS header, MIME_MAX_HEADER_SIZE, f) != NULL) | |
532 | { | |
533 | /* boundary line must start with 2 dashes */ | |
534 | if (Ustrncmp(header,"--",2) == 0) | |
535 | { | |
536 | if (Ustrncmp((header+2),context->boundary,Ustrlen(context->boundary)) == 0) | |
537 | { | |
538 | /* found boundary */ | |
539 | if (Ustrncmp((header+2+Ustrlen(context->boundary)),"--",2) == 0) | |
540 | { | |
541 | /* END boundary found */ | |
542 | debug_printf("End boundary found %s\n", context->boundary); | |
543 | return rc; | |
544 | } | |
545 | else | |
546 | debug_printf("Next part with boundary %s\n", context->boundary); | |
547 | ||
548 | /* can't use break here */ | |
549 | goto DECODE_HEADERS; | |
550 | } | |
551 | } | |
552 | } | |
553 | /* Hit EOF or read error. Ugh. */ | |
554 | debug_printf("Hit EOF ...\n"); | |
555 | return rc; | |
556 | } | |
557 | ||
558 | DECODE_HEADERS: | |
559 | /* parse headers, set up expansion variables */ | |
560 | while (mime_get_header(f,header)) | |
561 | { | |
562 | int i; | |
563 | /* loop through header list */ | |
564 | for (i = 0; i < mime_header_list_size; i++) | |
565 | { | |
566 | uschar *header_value = NULL; | |
567 | int header_value_len = 0; | |
568 | ||
569 | /* found an interesting header? */ | |
570 | if (strncmpic(mime_header_list[i].name,header,mime_header_list[i].namelen) == 0) | |
571 | { | |
572 | uschar *p = header + mime_header_list[i].namelen; | |
573 | /* yes, grab the value (normalize to lower case) | |
574 | and copy to its corresponding expansion variable */ | |
575 | while(*p != ';') | |
576 | { | |
577 | *p = tolower(*p); | |
578 | p++; | |
579 | } | |
580 | header_value_len = (p - (header + mime_header_list[i].namelen)); | |
581 | header_value = (uschar *)malloc(header_value_len+1); | |
582 | memset(header_value,0,header_value_len+1); | |
583 | p = header + mime_header_list[i].namelen; | |
584 | Ustrncpy(header_value, p, header_value_len); | |
585 | debug_printf("Found %s MIME header, value is '%s'\n", mime_header_list[i].name, header_value); | |
586 | *((uschar **)(mime_header_list[i].value)) = header_value; | |
587 | ||
588 | /* make p point to the next character after the closing ';' */ | |
589 | p += (header_value_len+1); | |
590 | ||
591 | /* grab all param=value tags on the remaining line, check if they are interesting */ | |
592 | NEXT_PARAM_SEARCH: | |
593 | while (*p != 0) | |
594 | { | |
595 | mime_parameter * mp; | |
596 | for (mp = mime_parameter_list; | |
597 | mp < &mime_parameter_list[mime_parameter_list_size]; | |
598 | mp++) | |
599 | { | |
600 | uschar *param_value = NULL; | |
601 | int param_value_len = 0; | |
602 | ||
603 | /* found an interesting parameter? */ | |
604 | if (strncmpic(mp->name, p, mp->namelen) == 0) | |
605 | { | |
606 | uschar *q = p + mp->namelen; | |
607 | int size = 0; | |
608 | int ptr = 0; | |
609 | ||
610 | /* yes, grab the value and copy to its corresponding expansion variable */ | |
611 | while(*q && *q != ';') /* ; terminates */ | |
612 | { | |
613 | if (*q == '"') | |
614 | { | |
615 | q++; /* skip leading " */ | |
616 | while(*q && *q != '"') /* which protects ; */ | |
617 | param_value = string_cat(param_value, &size, &ptr, q++, 1); | |
618 | if (*q) q++; /* skip trailing " */ | |
619 | } | |
620 | else | |
621 | param_value = string_cat(param_value, &size, &ptr, q++, 1); | |
622 | } | |
623 | param_value[ptr++] = '\0'; | |
624 | param_value_len = ptr; | |
625 | ||
626 | param_value = rfc2047_decode(param_value, check_rfc2047_length, NULL, 32, ¶m_value_len, &q); | |
627 | debug_printf("Found %s MIME parameter in %s header, value is '%s'\n", mp->name, mime_header_list[i].name, param_value); | |
628 | *((uschar **)(mp->value)) = param_value; | |
629 | p += (mp->namelen + param_value_len + 1); | |
630 | goto NEXT_PARAM_SEARCH; | |
631 | } | |
632 | } | |
633 | /* There is something, but not one of our interesting parameters. | |
634 | Advance to the next semicolon */ | |
635 | while(*p != ';') p++; | |
636 | p++; | |
637 | } | |
638 | } | |
639 | } | |
640 | } | |
641 | ||
642 | /* set additional flag variables (easier access) */ | |
643 | if ( (mime_content_type != NULL) && | |
644 | (Ustrncmp(mime_content_type,"multipart",9) == 0) ) | |
645 | mime_is_multipart = 1; | |
646 | ||
647 | /* Make a copy of the boundary pointer. | |
648 | Required since mime_boundary is global | |
649 | and can be overwritten further down in recursion */ | |
650 | nested_context.boundary = mime_boundary; | |
651 | ||
652 | /* raise global counter */ | |
653 | mime_part_count++; | |
654 | ||
655 | /* copy current file handle to global variable */ | |
656 | mime_stream = f; | |
657 | mime_current_boundary = context ? context->boundary : 0; | |
658 | ||
659 | /* Note the context */ | |
660 | mime_is_coverletter = !(context && context->context == MBC_ATTACHMENT); | |
661 | ||
662 | /* call ACL handling function */ | |
663 | rc = acl_check(ACL_WHERE_MIME, NULL, acl, user_msgptr, log_msgptr); | |
664 | ||
665 | mime_stream = NULL; | |
666 | mime_current_boundary = NULL; | |
667 | ||
668 | if (rc != OK) break; | |
669 | ||
670 | /* If we have a multipart entity and a boundary, go recursive */ | |
671 | if ( (mime_content_type != NULL) && | |
672 | (nested_context.boundary != NULL) && | |
673 | (Ustrncmp(mime_content_type,"multipart",9) == 0) ) | |
674 | { | |
675 | debug_printf("Entering multipart recursion, boundary '%s'\n", nested_context.boundary); | |
676 | ||
677 | nested_context.context = | |
678 | context && context->context == MBC_ATTACHMENT | |
679 | ? MBC_ATTACHMENT | |
680 | : Ustrcmp(mime_content_type,"multipart/alternative") == 0 | |
681 | || Ustrcmp(mime_content_type,"multipart/related") == 0 | |
682 | ? MBC_COVERLETTER_ALL | |
683 | : MBC_COVERLETTER_ONESHOT; | |
684 | ||
685 | rc = mime_acl_check(acl, f, &nested_context, user_msgptr, log_msgptr); | |
686 | if (rc != OK) break; | |
687 | } | |
688 | else if ( (mime_content_type != NULL) && | |
689 | (Ustrncmp(mime_content_type,"message/rfc822",14) == 0) ) | |
690 | { | |
691 | uschar *rfc822name = NULL; | |
692 | uschar filename[2048]; | |
693 | int file_nr = 0; | |
694 | int result = 0; | |
695 | ||
696 | /* must find first free sequential filename */ | |
697 | do | |
698 | { | |
699 | struct stat mystat; | |
700 | (void)string_format(filename, 2048, | |
701 | "%s/scan/%s/__rfc822_%05u", spool_directory, message_id, file_nr++); | |
702 | /* security break */ | |
703 | if (file_nr >= 128) | |
704 | goto NO_RFC822; | |
705 | result = stat(CS filename,&mystat); | |
706 | } while (result != -1); | |
707 | ||
708 | rfc822name = filename; | |
709 | ||
710 | /* decode RFC822 attachment */ | |
711 | mime_decoded_filename = NULL; | |
712 | mime_stream = f; | |
713 | mime_current_boundary = context ? context->boundary : NULL; | |
714 | mime_decode(&rfc822name); | |
715 | mime_stream = NULL; | |
716 | mime_current_boundary = NULL; | |
717 | if (!mime_decoded_filename) /* decoding failed */ | |
718 | { | |
719 | log_write(0, LOG_MAIN, | |
720 | "mime_regex acl condition warning - could not decode RFC822 MIME part to file."); | |
721 | return DEFER; | |
722 | } | |
723 | mime_decoded_filename = NULL; | |
724 | } | |
725 | ||
726 | NO_RFC822: | |
727 | /* If the boundary of this instance is NULL, we are finished here */ | |
728 | if (context == NULL) break; | |
729 | ||
730 | if (context->context == MBC_COVERLETTER_ONESHOT) | |
731 | context->context = MBC_ATTACHMENT; | |
732 | } | |
733 | ||
734 | return rc; | |
735 | } | |
736 | ||
737 | #endif /*WITH_CONTENT_SCAN*/ | |
738 | ||
739 | /* vi: sw ai sw=2 | |
740 | */ |