Commit | Line | Data |
---|---|---|
7156b1ef | 1 | /* $Cambridge: exim/src/src/mime.c,v 1.19 2009/11/11 10:08:02 nm4 Exp $ */ |
8523533c TK |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
7 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004 */ | |
8 | /* License: GPL */ | |
9 | ||
10 | #include "exim.h" | |
11 | #ifdef WITH_CONTENT_SCAN | |
12 | #include "mime.h" | |
13 | #include <sys/stat.h> | |
14 | ||
15 | FILE *mime_stream = NULL; | |
16 | uschar *mime_current_boundary = NULL; | |
17 | ||
18 | /************************************************* | |
19 | * set MIME anomaly level + text * | |
20 | *************************************************/ | |
21 | ||
22 | /* Small wrapper to set the two expandables which | |
23 | give info on detected "problems" in MIME | |
24 | encodings. Those are defined in mime.h. */ | |
25 | ||
26 | void mime_set_anomaly(int level, char *text) { | |
27 | mime_anomaly_level = level; | |
f7b63901 PH |
28 | mime_anomaly_text = US text; |
29 | } | |
8523533c TK |
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 | ||
d203e649 | 44 | uschar *mime_decode_qp_char(uschar *qp_p, int *c) { |
8523533c | 45 | uschar *initial_pos = qp_p; |
8e669ac1 | 46 | |
8523533c TK |
47 | /* advance one char */ |
48 | qp_p++; | |
8e669ac1 | 49 | |
d203e649 PH |
50 | /* Check for two hex digits and decode them */ |
51 | if (isxdigit(*qp_p) && isxdigit(qp_p[1])) { | |
52 | /* Do hex conversion */ | |
53 | if (isdigit(*qp_p)) {*c = *qp_p - '0';} | |
54 | else {*c = toupper(*qp_p) - 'A' + 10;}; | |
55 | *c <<= 4; | |
56 | if (isdigit(qp_p[1])) {*c |= qp_p[1] - '0';} | |
57 | else {*c |= toupper(qp_p[1]) - 'A' + 10;}; | |
58 | return qp_p + 2; | |
59 | }; | |
60 | ||
61 | /* tab or whitespace may follow just ignore it if it precedes \n */ | |
62 | while (*qp_p == '\t' || *qp_p == ' ' || *qp_p == '\r') | |
8523533c | 63 | qp_p++; |
d203e649 PH |
64 | |
65 | if (*qp_p == '\n') { | |
66 | /* hit soft line break */ | |
8523533c TK |
67 | *c = -1; |
68 | return qp_p; | |
8523533c | 69 | }; |
8e669ac1 | 70 | |
d203e649 PH |
71 | /* illegal char here */ |
72 | *c = -2; | |
73 | return initial_pos; | |
8523533c TK |
74 | } |
75 | ||
76 | ||
baee9eee NM |
77 | /* just dump MIME part without any decoding */ |
78 | static int mime_decode_asis(FILE* in, FILE* out, uschar* boundary) | |
79 | { | |
80 | int len, size = 0; | |
81 | uschar buffer[MIME_MAX_LINE_LENGTH]; | |
d203e649 | 82 | |
baee9eee NM |
83 | while(fgets(CS buffer, MIME_MAX_LINE_LENGTH, mime_stream) != NULL) { |
84 | if (boundary != NULL | |
85 | && Ustrncmp(buffer, "--", 2) == 0 | |
86 | && Ustrncmp((buffer+2), boundary, Ustrlen(boundary)) == 0 | |
87 | ) | |
88 | break; | |
89 | ||
90 | len = Ustrlen(buffer); | |
91 | if (fwrite(buffer, 1, (size_t)len, out) < len) | |
92 | return -1; | |
93 | size += len; | |
94 | } /* while */ | |
95 | return size; | |
96 | } | |
84330b7b | 97 | |
8523533c | 98 | |
baee9eee NM |
99 | /* decode base64 MIME part */ |
100 | static int mime_decode_base64(FILE* in, FILE* out, uschar* boundary) | |
101 | { | |
102 | uschar ibuf[MIME_MAX_LINE_LENGTH], obuf[MIME_MAX_LINE_LENGTH]; | |
103 | uschar *ipos, *opos; | |
104 | size_t len, size = 0; | |
105 | int bytestate = 0; | |
106 | ||
107 | opos = obuf; | |
108 | ||
7156b1ef | 109 | while (Ufgets(ibuf, MIME_MAX_LINE_LENGTH, in) != NULL) |
baee9eee NM |
110 | { |
111 | if (boundary != NULL | |
112 | && Ustrncmp(ibuf, "--", 2) == 0 | |
113 | && Ustrncmp((ibuf+2), boundary, Ustrlen(boundary)) == 0 | |
114 | ) | |
115 | break; | |
116 | ||
117 | for (ipos = ibuf ; *ipos != '\r' && *ipos != '\n' && *ipos != 0; ++ipos) { | |
118 | /* skip padding */ | |
119 | if (*ipos == '=') { | |
120 | ++bytestate; | |
121 | continue; | |
122 | } | |
123 | /* skip bad characters */ | |
124 | if (mime_b64[*ipos] == 128) { | |
8523533c | 125 | mime_set_anomaly(MIME_ANOMALY_BROKEN_BASE64); |
baee9eee | 126 | continue; |
8523533c | 127 | } |
baee9eee NM |
128 | /* simple state-machine */ |
129 | switch((bytestate++) & 3) { | |
130 | case 0: | |
131 | *opos = mime_b64[*ipos] << 2; | |
132 | break; | |
133 | case 1: | |
134 | *opos |= mime_b64[*ipos] >> 4; | |
135 | ++opos; | |
136 | *opos = mime_b64[*ipos] << 4; | |
137 | break; | |
138 | case 2: | |
139 | *opos |= mime_b64[*ipos] >> 2; | |
140 | ++opos; | |
141 | *opos = mime_b64[*ipos] << 6; | |
142 | break; | |
143 | case 3: | |
144 | *opos |= mime_b64[*ipos]; | |
145 | ++opos; | |
146 | break; | |
147 | } /* switch */ | |
148 | } /* for */ | |
149 | /* something to write? */ | |
150 | len = opos - obuf; | |
151 | if (len > 0) { | |
152 | if (fwrite(obuf, 1, len, out) != len) | |
153 | return -1; /* error */ | |
154 | size += len; | |
155 | /* copy incomplete last byte to start of obuf, where we continue */ | |
7156b1ef | 156 | if ((bytestate & 3) != 0) |
baee9eee NM |
157 | *obuf = *opos; |
158 | opos = obuf; | |
159 | } | |
160 | } /* while */ | |
161 | ||
162 | /* write out last byte if it was incomplete */ | |
163 | if (bytestate & 3) { | |
164 | if (fwrite(obuf, 1, 1, out) != 1) | |
165 | return -1; | |
166 | ++size; | |
167 | } | |
8e669ac1 | 168 | |
baee9eee NM |
169 | return size; |
170 | } | |
8e669ac1 | 171 | |
8e669ac1 | 172 | |
baee9eee NM |
173 | /* decode quoted-printable MIME part */ |
174 | static int mime_decode_qp(FILE* in, FILE* out, uschar* boundary) | |
175 | { | |
176 | uschar ibuf[MIME_MAX_LINE_LENGTH], obuf[MIME_MAX_LINE_LENGTH]; | |
177 | uschar *ipos, *opos; | |
178 | size_t len, size = 0; | |
179 | ||
180 | while (fgets(CS ibuf, MIME_MAX_LINE_LENGTH, in) != NULL) | |
181 | { | |
182 | if (boundary != NULL | |
183 | && Ustrncmp(ibuf, "--", 2) == 0 | |
184 | && Ustrncmp((ibuf+2), boundary, Ustrlen(boundary)) == 0 | |
185 | ) | |
186 | break; /* todo: check for missing boundary */ | |
8523533c | 187 | |
baee9eee NM |
188 | ipos = ibuf; |
189 | opos = obuf; | |
190 | ||
191 | while (*ipos != 0) { | |
192 | if (*ipos == '=') { | |
8523533c | 193 | int decode_qp_result; |
8e669ac1 | 194 | |
baee9eee | 195 | ipos = mime_decode_qp_char(ipos, &decode_qp_result); |
8e669ac1 | 196 | |
8523533c | 197 | if (decode_qp_result == -2) { |
baee9eee | 198 | /* Error from decoder. ipos is unchanged. */ |
8523533c | 199 | mime_set_anomaly(MIME_ANOMALY_BROKEN_QP); |
baee9eee NM |
200 | *opos = '='; |
201 | ++opos; | |
202 | ++ipos; | |
8523533c TK |
203 | } |
204 | else if (decode_qp_result == -1) { | |
205 | break; | |
206 | } | |
207 | else if (decode_qp_result >= 0) { | |
baee9eee NM |
208 | *opos = decode_qp_result; |
209 | ++opos; | |
210 | } | |
8523533c TK |
211 | } |
212 | else { | |
baee9eee NM |
213 | *opos = *ipos; |
214 | ++opos; | |
215 | ++ipos; | |
216 | } | |
217 | } | |
218 | /* something to write? */ | |
219 | len = opos - obuf; | |
220 | if (len > 0) { | |
221 | if (fwrite(obuf, 1, len, out) != len) | |
222 | return -1; /* error */ | |
223 | size += len; | |
224 | } | |
8523533c | 225 | } |
baee9eee | 226 | return size; |
8523533c TK |
227 | } |
228 | ||
229 | ||
230 | FILE *mime_get_decode_file(uschar *pname, uschar *fname) { | |
f7b63901 | 231 | FILE *f = NULL; |
8523533c | 232 | uschar *filename; |
8e669ac1 | 233 | |
8523533c | 234 | filename = (uschar *)malloc(2048); |
8e669ac1 | 235 | |
8523533c | 236 | if ((pname != NULL) && (fname != NULL)) { |
b07e6aa3 | 237 | (void)string_format(filename, 2048, "%s/%s", pname, fname); |
2632889e | 238 | f = modefopen(filename,"wb+",SPOOL_MODE); |
8523533c TK |
239 | } |
240 | else if (pname == NULL) { | |
2632889e | 241 | f = modefopen(fname,"wb+",SPOOL_MODE); |
8523533c TK |
242 | } |
243 | else if (fname == NULL) { | |
244 | int file_nr = 0; | |
245 | int result = 0; | |
246 | ||
247 | /* must find first free sequential filename */ | |
248 | do { | |
249 | struct stat mystat; | |
b07e6aa3 | 250 | (void)string_format(filename,2048,"%s/%s-%05u", pname, message_id, file_nr); |
8523533c TK |
251 | file_nr++; |
252 | /* security break */ | |
253 | if (file_nr >= 1024) | |
254 | break; | |
255 | result = stat(CS filename,&mystat); | |
256 | } | |
257 | while(result != -1); | |
2632889e | 258 | f = modefopen(filename,"wb+",SPOOL_MODE); |
8523533c | 259 | }; |
8e669ac1 | 260 | |
8523533c TK |
261 | /* set expansion variable */ |
262 | mime_decoded_filename = filename; | |
8e669ac1 | 263 | |
8523533c TK |
264 | return f; |
265 | } | |
266 | ||
267 | ||
268 | int mime_decode(uschar **listptr) { | |
269 | int sep = 0; | |
270 | uschar *list = *listptr; | |
271 | uschar *option; | |
272 | uschar option_buffer[1024]; | |
273 | uschar decode_path[1024]; | |
274 | FILE *decode_file = NULL; | |
8523533c TK |
275 | long f_pos = 0; |
276 | unsigned int size_counter = 0; | |
baee9eee | 277 | int (*decode_function)(FILE*, FILE*, uschar*); |
8523533c TK |
278 | |
279 | if (mime_stream == NULL) | |
280 | return FAIL; | |
8e669ac1 | 281 | |
8523533c | 282 | f_pos = ftell(mime_stream); |
8e669ac1 | 283 | |
8523533c | 284 | /* build default decode path (will exist since MBOX must be spooled up) */ |
b07e6aa3 | 285 | (void)string_format(decode_path,1024,"%s/scan/%s",spool_directory,message_id); |
8e669ac1 | 286 | |
8523533c TK |
287 | /* try to find 1st option */ |
288 | if ((option = string_nextinlist(&list, &sep, | |
289 | option_buffer, | |
290 | sizeof(option_buffer))) != NULL) { | |
8e669ac1 | 291 | |
8523533c TK |
292 | /* parse 1st option */ |
293 | if ( (Ustrcmp(option,"false") == 0) || (Ustrcmp(option,"0") == 0) ) { | |
294 | /* explicitly no decoding */ | |
295 | return FAIL; | |
296 | }; | |
8e669ac1 | 297 | |
8523533c TK |
298 | if (Ustrcmp(option,"default") == 0) { |
299 | /* explicit default path + file names */ | |
300 | goto DEFAULT_PATH; | |
301 | }; | |
8e669ac1 | 302 | |
8523533c TK |
303 | if (option[0] == '/') { |
304 | struct stat statbuf; | |
305 | ||
306 | memset(&statbuf,0,sizeof(statbuf)); | |
8e669ac1 | 307 | |
8523533c TK |
308 | /* assume either path or path+file name */ |
309 | if ( (stat(CS option, &statbuf) == 0) && S_ISDIR(statbuf.st_mode) ) | |
310 | /* is directory, use it as decode_path */ | |
311 | decode_file = mime_get_decode_file(option, NULL); | |
312 | else | |
313 | /* does not exist or is a file, use as full file name */ | |
314 | decode_file = mime_get_decode_file(NULL, option); | |
315 | } | |
316 | else | |
317 | /* assume file name only, use default path */ | |
318 | decode_file = mime_get_decode_file(decode_path, option); | |
319 | } | |
320 | else | |
321 | /* no option? patch default path */ | |
322 | DEFAULT_PATH: decode_file = mime_get_decode_file(decode_path, NULL); | |
8e669ac1 | 323 | |
8523533c TK |
324 | if (decode_file == NULL) |
325 | return DEFER; | |
8e669ac1 | 326 | |
baee9eee NM |
327 | /* decode according to mime type */ |
328 | if (mime_content_transfer_encoding == NULL) | |
329 | /* no encoding, dump as-is */ | |
330 | decode_function = mime_decode_asis; | |
331 | else if (Ustrcmp(mime_content_transfer_encoding, "base64") == 0) | |
332 | decode_function = mime_decode_base64; | |
333 | else if (Ustrcmp(mime_content_transfer_encoding, "quoted-printable") == 0) | |
334 | decode_function = mime_decode_qp; | |
335 | else | |
336 | /* unknown encoding type, just dump as-is */ | |
337 | decode_function = mime_decode_asis; | |
8e669ac1 | 338 | |
baee9eee | 339 | size_counter = decode_function(mime_stream, decode_file, mime_current_boundary); |
8e669ac1 | 340 | |
8523533c | 341 | clearerr(mime_stream); |
baee9eee | 342 | fseek(mime_stream, f_pos, SEEK_SET); |
8e669ac1 | 343 | |
61da1593 | 344 | if (fclose(decode_file) != 0 || size_counter < 0) |
baee9eee NM |
345 | return DEFER; |
346 | ||
347 | /* round up to the next KiB */ | |
348 | mime_content_size = (size_counter + 1023) / 1024; | |
8e669ac1 | 349 | |
8523533c TK |
350 | return OK; |
351 | } | |
352 | ||
353 | int mime_get_header(FILE *f, uschar *header) { | |
354 | int c = EOF; | |
355 | int done = 0; | |
356 | int header_value_mode = 0; | |
357 | int header_open_brackets = 0; | |
358 | int num_copied = 0; | |
8e669ac1 | 359 | |
8523533c | 360 | while(!done) { |
8e669ac1 | 361 | |
8523533c TK |
362 | c = fgetc(f); |
363 | if (c == EOF) break; | |
8e669ac1 | 364 | |
8523533c TK |
365 | /* always skip CRs */ |
366 | if (c == '\r') continue; | |
8e669ac1 | 367 | |
8523533c TK |
368 | if (c == '\n') { |
369 | if (num_copied > 0) { | |
370 | /* look if next char is '\t' or ' ' */ | |
371 | c = fgetc(f); | |
372 | if (c == EOF) break; | |
373 | if ( (c == '\t') || (c == ' ') ) continue; | |
f1e894f3 | 374 | (void)ungetc(c,f); |
8523533c TK |
375 | }; |
376 | /* end of the header, terminate with ';' */ | |
377 | c = ';'; | |
378 | done = 1; | |
379 | }; | |
8e669ac1 | 380 | |
8523533c TK |
381 | /* skip control characters */ |
382 | if (c < 32) continue; | |
383 | ||
384 | if (header_value_mode) { | |
385 | /* --------- value mode ----------- */ | |
386 | /* skip leading whitespace */ | |
387 | if ( ((c == '\t') || (c == ' ')) && (header_value_mode == 1) ) | |
388 | continue; | |
8e669ac1 | 389 | |
8523533c TK |
390 | /* we have hit a non-whitespace char, start copying value data */ |
391 | header_value_mode = 2; | |
8e669ac1 | 392 | |
8523533c TK |
393 | /* skip quotes */ |
394 | if (c == '"') continue; | |
8e669ac1 | 395 | |
8523533c TK |
396 | /* leave value mode on ';' */ |
397 | if (c == ';') { | |
398 | header_value_mode = 0; | |
399 | }; | |
400 | /* -------------------------------- */ | |
401 | } | |
402 | else { | |
403 | /* -------- non-value mode -------- */ | |
404 | /* skip whitespace + tabs */ | |
405 | if ( (c == ' ') || (c == '\t') ) | |
406 | continue; | |
407 | if (c == '\\') { | |
408 | /* quote next char. can be used | |
409 | to escape brackets. */ | |
410 | c = fgetc(f); | |
411 | if (c == EOF) break; | |
412 | } | |
413 | else if (c == '(') { | |
414 | header_open_brackets++; | |
415 | continue; | |
416 | } | |
417 | else if ((c == ')') && header_open_brackets) { | |
418 | header_open_brackets--; | |
419 | continue; | |
420 | } | |
421 | else if ( (c == '=') && !header_open_brackets ) { | |
422 | /* enter value mode */ | |
423 | header_value_mode = 1; | |
424 | }; | |
8e669ac1 | 425 | |
8523533c TK |
426 | /* skip chars while we are in a comment */ |
427 | if (header_open_brackets > 0) | |
428 | continue; | |
429 | /* -------------------------------- */ | |
430 | }; | |
8e669ac1 | 431 | |
8523533c TK |
432 | /* copy the char to the buffer */ |
433 | header[num_copied] = (uschar)c; | |
434 | /* raise counter */ | |
435 | num_copied++; | |
8e669ac1 | 436 | |
8523533c TK |
437 | /* break if header buffer is full */ |
438 | if (num_copied > MIME_MAX_HEADER_SIZE-1) { | |
439 | done = 1; | |
440 | }; | |
441 | }; | |
442 | ||
9f093f3a | 443 | if ((num_copied > 0) && (header[num_copied-1] != ';')) { |
8523533c TK |
444 | header[num_copied-1] = ';'; |
445 | }; | |
446 | ||
447 | /* 0-terminate */ | |
448 | header[num_copied] = '\0'; | |
8e669ac1 | 449 | |
8523533c TK |
450 | /* return 0 for EOF or empty line */ |
451 | if ((c == EOF) || (num_copied == 1)) | |
452 | return 0; | |
453 | else | |
454 | return 1; | |
455 | } | |
456 | ||
457 | ||
54cdb463 PH |
458 | int mime_acl_check(uschar *acl, FILE *f, struct mime_boundary_context *context, |
459 | uschar **user_msgptr, uschar **log_msgptr) { | |
8523533c TK |
460 | int rc = OK; |
461 | uschar *header = NULL; | |
462 | struct mime_boundary_context nested_context; | |
463 | ||
464 | /* reserve a line buffer to work in */ | |
465 | header = (uschar *)malloc(MIME_MAX_HEADER_SIZE+1); | |
466 | if (header == NULL) { | |
467 | log_write(0, LOG_PANIC, | |
54cdb463 | 468 | "MIME ACL: can't allocate %d bytes of memory.", MIME_MAX_HEADER_SIZE+1); |
8523533c TK |
469 | return DEFER; |
470 | }; | |
471 | ||
472 | /* Not actually used at the moment, but will be vital to fixing | |
473 | * some RFC 2046 nonconformance later... */ | |
474 | nested_context.parent = context; | |
475 | ||
476 | /* loop through parts */ | |
477 | while(1) { | |
8e669ac1 | 478 | |
8523533c | 479 | /* reset all per-part mime variables */ |
f7b63901 | 480 | mime_anomaly_level = 0; |
8523533c TK |
481 | mime_anomaly_text = NULL; |
482 | mime_boundary = NULL; | |
483 | mime_charset = NULL; | |
484 | mime_decoded_filename = NULL; | |
485 | mime_filename = NULL; | |
486 | mime_content_description = NULL; | |
487 | mime_content_disposition = NULL; | |
488 | mime_content_id = NULL; | |
489 | mime_content_transfer_encoding = NULL; | |
490 | mime_content_type = NULL; | |
491 | mime_is_multipart = 0; | |
492 | mime_content_size = 0; | |
8e669ac1 | 493 | |
8523533c TK |
494 | /* |
495 | If boundary is null, we assume that *f is positioned on the start of headers (for example, | |
496 | at the very beginning of a message. | |
497 | If a boundary is given, we must first advance to it to reach the start of the next header | |
498 | block. | |
499 | */ | |
8e669ac1 | 500 | |
8523533c TK |
501 | /* NOTE -- there's an error here -- RFC2046 specifically says to |
502 | * check for outer boundaries. This code doesn't do that, and | |
503 | * I haven't fixed this. | |
504 | * | |
8e669ac1 | 505 | * (I have moved partway towards adding support, however, by adding |
8523533c TK |
506 | * a "parent" field to my new boundary-context structure.) |
507 | */ | |
508 | if (context != NULL) { | |
509 | while(fgets(CS header, MIME_MAX_HEADER_SIZE, f) != NULL) { | |
510 | /* boundary line must start with 2 dashes */ | |
511 | if (Ustrncmp(header,"--",2) == 0) { | |
512 | if (Ustrncmp((header+2),context->boundary,Ustrlen(context->boundary)) == 0) { | |
513 | /* found boundary */ | |
514 | if (Ustrncmp((header+2+Ustrlen(context->boundary)),"--",2) == 0) { | |
515 | /* END boundary found */ | |
516 | debug_printf("End boundary found %s\n", context->boundary); | |
517 | return rc; | |
518 | } | |
519 | else { | |
520 | debug_printf("Next part with boundary %s\n", context->boundary); | |
521 | }; | |
522 | /* can't use break here */ | |
523 | goto DECODE_HEADERS; | |
524 | } | |
525 | }; | |
526 | } | |
527 | /* Hit EOF or read error. Ugh. */ | |
528 | debug_printf("Hit EOF ...\n"); | |
529 | return rc; | |
530 | }; | |
8e669ac1 | 531 | |
8523533c TK |
532 | DECODE_HEADERS: |
533 | /* parse headers, set up expansion variables */ | |
534 | while(mime_get_header(f,header)) { | |
535 | int i; | |
536 | /* loop through header list */ | |
537 | for (i = 0; i < mime_header_list_size; i++) { | |
538 | uschar *header_value = NULL; | |
539 | int header_value_len = 0; | |
8e669ac1 | 540 | |
8523533c TK |
541 | /* found an interesting header? */ |
542 | if (strncmpic(mime_header_list[i].name,header,mime_header_list[i].namelen) == 0) { | |
543 | uschar *p = header + mime_header_list[i].namelen; | |
544 | /* yes, grab the value (normalize to lower case) | |
545 | and copy to its corresponding expansion variable */ | |
546 | while(*p != ';') { | |
547 | *p = tolower(*p); | |
548 | p++; | |
549 | }; | |
550 | header_value_len = (p - (header + mime_header_list[i].namelen)); | |
551 | header_value = (uschar *)malloc(header_value_len+1); | |
552 | memset(header_value,0,header_value_len+1); | |
553 | p = header + mime_header_list[i].namelen; | |
554 | Ustrncpy(header_value, p, header_value_len); | |
555 | debug_printf("Found %s MIME header, value is '%s'\n", mime_header_list[i].name, header_value); | |
556 | *((uschar **)(mime_header_list[i].value)) = header_value; | |
8e669ac1 | 557 | |
8523533c TK |
558 | /* make p point to the next character after the closing ';' */ |
559 | p += (header_value_len+1); | |
8e669ac1 | 560 | |
8523533c TK |
561 | /* grab all param=value tags on the remaining line, check if they are interesting */ |
562 | NEXT_PARAM_SEARCH: while (*p != 0) { | |
563 | int j; | |
564 | for (j = 0; j < mime_parameter_list_size; j++) { | |
565 | uschar *param_value = NULL; | |
566 | int param_value_len = 0; | |
8e669ac1 | 567 | |
8523533c TK |
568 | /* found an interesting parameter? */ |
569 | if (strncmpic(mime_parameter_list[j].name,p,mime_parameter_list[j].namelen) == 0) { | |
570 | uschar *q = p + mime_parameter_list[j].namelen; | |
571 | /* yes, grab the value and copy to its corresponding expansion variable */ | |
572 | while(*q != ';') q++; | |
573 | param_value_len = (q - (p + mime_parameter_list[j].namelen)); | |
574 | param_value = (uschar *)malloc(param_value_len+1); | |
575 | memset(param_value,0,param_value_len+1); | |
576 | q = p + mime_parameter_list[j].namelen; | |
577 | Ustrncpy(param_value, q, param_value_len); | |
a0d6ba8a | 578 | param_value = rfc2047_decode(param_value, check_rfc2047_length, NULL, 32, ¶m_value_len, &q); |
8523533c TK |
579 | debug_printf("Found %s MIME parameter in %s header, value is '%s'\n", mime_parameter_list[j].name, mime_header_list[i].name, param_value); |
580 | *((uschar **)(mime_parameter_list[j].value)) = param_value; | |
581 | p += (mime_parameter_list[j].namelen + param_value_len + 1); | |
582 | goto NEXT_PARAM_SEARCH; | |
583 | }; | |
584 | } | |
585 | /* There is something, but not one of our interesting parameters. | |
586 | Advance to the next semicolon */ | |
587 | while(*p != ';') p++; | |
588 | p++; | |
589 | }; | |
590 | }; | |
591 | }; | |
592 | }; | |
8e669ac1 | 593 | |
8523533c TK |
594 | /* set additional flag variables (easier access) */ |
595 | if ( (mime_content_type != NULL) && | |
596 | (Ustrncmp(mime_content_type,"multipart",9) == 0) ) | |
597 | mime_is_multipart = 1; | |
8e669ac1 | 598 | |
8523533c TK |
599 | /* Make a copy of the boundary pointer. |
600 | Required since mime_boundary is global | |
601 | and can be overwritten further down in recursion */ | |
602 | nested_context.boundary = mime_boundary; | |
8e669ac1 | 603 | |
8523533c TK |
604 | /* raise global counter */ |
605 | mime_part_count++; | |
8e669ac1 | 606 | |
8523533c TK |
607 | /* copy current file handle to global variable */ |
608 | mime_stream = f; | |
609 | mime_current_boundary = context ? context->boundary : 0; | |
610 | ||
611 | /* Note the context */ | |
612 | mime_is_coverletter = !(context && context->context == MBC_ATTACHMENT); | |
8e669ac1 | 613 | |
8523533c | 614 | /* call ACL handling function */ |
54cdb463 | 615 | rc = acl_check(ACL_WHERE_MIME, NULL, acl, user_msgptr, log_msgptr); |
8e669ac1 | 616 | |
8523533c TK |
617 | mime_stream = NULL; |
618 | mime_current_boundary = NULL; | |
8e669ac1 | 619 | |
8523533c | 620 | if (rc != OK) break; |
8e669ac1 | 621 | |
8523533c TK |
622 | /* If we have a multipart entity and a boundary, go recursive */ |
623 | if ( (mime_content_type != NULL) && | |
624 | (nested_context.boundary != NULL) && | |
625 | (Ustrncmp(mime_content_type,"multipart",9) == 0) ) { | |
626 | debug_printf("Entering multipart recursion, boundary '%s'\n", nested_context.boundary); | |
627 | ||
628 | if (context && context->context == MBC_ATTACHMENT) | |
629 | nested_context.context = MBC_ATTACHMENT; | |
630 | else if (!Ustrcmp(mime_content_type,"multipart/alternative") | |
631 | || !Ustrcmp(mime_content_type,"multipart/related")) | |
632 | nested_context.context = MBC_COVERLETTER_ALL; | |
633 | else | |
634 | nested_context.context = MBC_COVERLETTER_ONESHOT; | |
635 | ||
54cdb463 | 636 | rc = mime_acl_check(acl, f, &nested_context, user_msgptr, log_msgptr); |
8523533c TK |
637 | if (rc != OK) break; |
638 | } | |
639 | else if ( (mime_content_type != NULL) && | |
640 | (Ustrncmp(mime_content_type,"message/rfc822",14) == 0) ) { | |
641 | uschar *rfc822name = NULL; | |
642 | uschar filename[2048]; | |
643 | int file_nr = 0; | |
644 | int result = 0; | |
8e669ac1 | 645 | |
8523533c TK |
646 | /* must find first free sequential filename */ |
647 | do { | |
648 | struct stat mystat; | |
b07e6aa3 | 649 | (void)string_format(filename,2048,"%s/scan/%s/__rfc822_%05u", spool_directory, message_id, file_nr); |
8523533c TK |
650 | file_nr++; |
651 | /* security break */ | |
652 | if (file_nr >= 128) | |
653 | goto NO_RFC822; | |
654 | result = stat(CS filename,&mystat); | |
655 | } | |
656 | while(result != -1); | |
8e669ac1 | 657 | |
8523533c | 658 | rfc822name = filename; |
8e669ac1 | 659 | |
8523533c TK |
660 | /* decode RFC822 attachment */ |
661 | mime_decoded_filename = NULL; | |
662 | mime_stream = f; | |
663 | mime_current_boundary = context ? context->boundary : NULL; | |
664 | mime_decode(&rfc822name); | |
665 | mime_stream = NULL; | |
666 | mime_current_boundary = NULL; | |
667 | if (mime_decoded_filename == NULL) { | |
668 | /* decoding failed */ | |
669 | log_write(0, LOG_MAIN, | |
670 | "mime_regex acl condition warning - could not decode RFC822 MIME part to file."); | |
671 | return DEFER; | |
672 | }; | |
673 | mime_decoded_filename = NULL; | |
674 | }; | |
8e669ac1 | 675 | |
8523533c TK |
676 | NO_RFC822: |
677 | /* If the boundary of this instance is NULL, we are finished here */ | |
678 | if (context == NULL) break; | |
679 | ||
680 | if (context->context == MBC_COVERLETTER_ONESHOT) | |
681 | context->context = MBC_ATTACHMENT; | |
8e669ac1 | 682 | |
8523533c TK |
683 | }; |
684 | ||
685 | return rc; | |
686 | } | |
687 | ||
688 | #endif |