Commit | Line | Data |
---|---|---|
8523533c TK |
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 | |
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 | ||
1ba28e2b | 24 | void mime_set_anomaly(int level, const char *text) { |
8523533c | 25 | mime_anomaly_level = level; |
1ba28e2b | 26 | mime_anomaly_text = CUS text; |
f7b63901 | 27 | } |
8523533c TK |
28 | |
29 | ||
30 | /************************************************* | |
31 | * decode quoted-printable chars * | |
32 | *************************************************/ | |
33 | ||
34 | /* gets called when we hit a = | |
35 | returns: new pointer position | |
36 | result code in c: | |
37 | -2 - decode error | |
38 | -1 - soft line break, no char | |
39 | 0-255 - char to write | |
40 | */ | |
41 | ||
d203e649 | 42 | uschar *mime_decode_qp_char(uschar *qp_p, int *c) { |
8523533c | 43 | uschar *initial_pos = qp_p; |
8e669ac1 | 44 | |
8523533c TK |
45 | /* advance one char */ |
46 | qp_p++; | |
8e669ac1 | 47 | |
d203e649 PH |
48 | /* Check for two hex digits and decode them */ |
49 | if (isxdigit(*qp_p) && isxdigit(qp_p[1])) { | |
50 | /* Do hex conversion */ | |
51 | if (isdigit(*qp_p)) {*c = *qp_p - '0';} | |
52 | else {*c = toupper(*qp_p) - 'A' + 10;}; | |
53 | *c <<= 4; | |
54 | if (isdigit(qp_p[1])) {*c |= qp_p[1] - '0';} | |
55 | else {*c |= toupper(qp_p[1]) - 'A' + 10;}; | |
56 | return qp_p + 2; | |
57 | }; | |
58 | ||
59 | /* tab or whitespace may follow just ignore it if it precedes \n */ | |
60 | while (*qp_p == '\t' || *qp_p == ' ' || *qp_p == '\r') | |
8523533c | 61 | qp_p++; |
d203e649 PH |
62 | |
63 | if (*qp_p == '\n') { | |
64 | /* hit soft line break */ | |
8523533c TK |
65 | *c = -1; |
66 | return qp_p; | |
8523533c | 67 | }; |
8e669ac1 | 68 | |
d203e649 PH |
69 | /* illegal char here */ |
70 | *c = -2; | |
71 | return initial_pos; | |
8523533c TK |
72 | } |
73 | ||
74 | ||
baee9eee NM |
75 | /* just dump MIME part without any decoding */ |
76 | static int mime_decode_asis(FILE* in, FILE* out, uschar* boundary) | |
77 | { | |
78 | int len, size = 0; | |
79 | uschar buffer[MIME_MAX_LINE_LENGTH]; | |
d203e649 | 80 | |
baee9eee NM |
81 | while(fgets(CS buffer, MIME_MAX_LINE_LENGTH, mime_stream) != NULL) { |
82 | if (boundary != NULL | |
83 | && Ustrncmp(buffer, "--", 2) == 0 | |
84 | && Ustrncmp((buffer+2), boundary, Ustrlen(boundary)) == 0 | |
85 | ) | |
86 | break; | |
87 | ||
88 | len = Ustrlen(buffer); | |
89 | if (fwrite(buffer, 1, (size_t)len, out) < len) | |
90 | return -1; | |
91 | size += len; | |
92 | } /* while */ | |
93 | return size; | |
94 | } | |
84330b7b | 95 | |
8523533c | 96 | |
baee9eee NM |
97 | /* decode base64 MIME part */ |
98 | static int mime_decode_base64(FILE* in, FILE* out, uschar* boundary) | |
99 | { | |
100 | uschar ibuf[MIME_MAX_LINE_LENGTH], obuf[MIME_MAX_LINE_LENGTH]; | |
101 | uschar *ipos, *opos; | |
102 | size_t len, size = 0; | |
103 | int bytestate = 0; | |
104 | ||
105 | opos = obuf; | |
106 | ||
7156b1ef | 107 | while (Ufgets(ibuf, MIME_MAX_LINE_LENGTH, in) != NULL) |
baee9eee NM |
108 | { |
109 | if (boundary != NULL | |
110 | && Ustrncmp(ibuf, "--", 2) == 0 | |
111 | && Ustrncmp((ibuf+2), boundary, Ustrlen(boundary)) == 0 | |
112 | ) | |
113 | break; | |
114 | ||
115 | for (ipos = ibuf ; *ipos != '\r' && *ipos != '\n' && *ipos != 0; ++ipos) { | |
116 | /* skip padding */ | |
117 | if (*ipos == '=') { | |
118 | ++bytestate; | |
119 | continue; | |
120 | } | |
121 | /* skip bad characters */ | |
122 | if (mime_b64[*ipos] == 128) { | |
8523533c | 123 | mime_set_anomaly(MIME_ANOMALY_BROKEN_BASE64); |
baee9eee | 124 | continue; |
8523533c | 125 | } |
baee9eee NM |
126 | /* simple state-machine */ |
127 | switch((bytestate++) & 3) { | |
128 | case 0: | |
129 | *opos = mime_b64[*ipos] << 2; | |
130 | break; | |
131 | case 1: | |
132 | *opos |= mime_b64[*ipos] >> 4; | |
133 | ++opos; | |
134 | *opos = mime_b64[*ipos] << 4; | |
135 | break; | |
136 | case 2: | |
137 | *opos |= mime_b64[*ipos] >> 2; | |
138 | ++opos; | |
139 | *opos = mime_b64[*ipos] << 6; | |
140 | break; | |
141 | case 3: | |
142 | *opos |= mime_b64[*ipos]; | |
143 | ++opos; | |
144 | break; | |
145 | } /* switch */ | |
146 | } /* for */ | |
147 | /* something to write? */ | |
148 | len = opos - obuf; | |
149 | if (len > 0) { | |
150 | if (fwrite(obuf, 1, len, out) != len) | |
151 | return -1; /* error */ | |
152 | size += len; | |
153 | /* copy incomplete last byte to start of obuf, where we continue */ | |
7156b1ef | 154 | if ((bytestate & 3) != 0) |
baee9eee NM |
155 | *obuf = *opos; |
156 | opos = obuf; | |
157 | } | |
158 | } /* while */ | |
159 | ||
160 | /* write out last byte if it was incomplete */ | |
161 | if (bytestate & 3) { | |
162 | if (fwrite(obuf, 1, 1, out) != 1) | |
163 | return -1; | |
164 | ++size; | |
165 | } | |
8e669ac1 | 166 | |
baee9eee NM |
167 | return size; |
168 | } | |
8e669ac1 | 169 | |
8e669ac1 | 170 | |
baee9eee NM |
171 | /* decode quoted-printable MIME part */ |
172 | static int mime_decode_qp(FILE* in, FILE* out, uschar* boundary) | |
173 | { | |
174 | uschar ibuf[MIME_MAX_LINE_LENGTH], obuf[MIME_MAX_LINE_LENGTH]; | |
175 | uschar *ipos, *opos; | |
176 | size_t len, size = 0; | |
177 | ||
178 | while (fgets(CS ibuf, MIME_MAX_LINE_LENGTH, in) != NULL) | |
179 | { | |
180 | if (boundary != NULL | |
181 | && Ustrncmp(ibuf, "--", 2) == 0 | |
182 | && Ustrncmp((ibuf+2), boundary, Ustrlen(boundary)) == 0 | |
183 | ) | |
184 | break; /* todo: check for missing boundary */ | |
8523533c | 185 | |
baee9eee NM |
186 | ipos = ibuf; |
187 | opos = obuf; | |
188 | ||
189 | while (*ipos != 0) { | |
190 | if (*ipos == '=') { | |
8523533c | 191 | int decode_qp_result; |
8e669ac1 | 192 | |
baee9eee | 193 | ipos = mime_decode_qp_char(ipos, &decode_qp_result); |
8e669ac1 | 194 | |
8523533c | 195 | if (decode_qp_result == -2) { |
baee9eee | 196 | /* Error from decoder. ipos is unchanged. */ |
8523533c | 197 | mime_set_anomaly(MIME_ANOMALY_BROKEN_QP); |
baee9eee NM |
198 | *opos = '='; |
199 | ++opos; | |
200 | ++ipos; | |
8523533c TK |
201 | } |
202 | else if (decode_qp_result == -1) { | |
203 | break; | |
204 | } | |
205 | else if (decode_qp_result >= 0) { | |
baee9eee NM |
206 | *opos = decode_qp_result; |
207 | ++opos; | |
208 | } | |
8523533c TK |
209 | } |
210 | else { | |
baee9eee NM |
211 | *opos = *ipos; |
212 | ++opos; | |
213 | ++ipos; | |
214 | } | |
215 | } | |
216 | /* something to write? */ | |
217 | len = opos - obuf; | |
218 | if (len > 0) { | |
219 | if (fwrite(obuf, 1, len, out) != len) | |
220 | return -1; /* error */ | |
221 | size += len; | |
222 | } | |
8523533c | 223 | } |
baee9eee | 224 | return size; |
8523533c TK |
225 | } |
226 | ||
227 | ||
228 | FILE *mime_get_decode_file(uschar *pname, uschar *fname) { | |
f7b63901 | 229 | FILE *f = NULL; |
8523533c | 230 | uschar *filename; |
8e669ac1 | 231 | |
8523533c | 232 | filename = (uschar *)malloc(2048); |
8e669ac1 | 233 | |
8523533c | 234 | if ((pname != NULL) && (fname != NULL)) { |
b07e6aa3 | 235 | (void)string_format(filename, 2048, "%s/%s", pname, fname); |
2632889e | 236 | f = modefopen(filename,"wb+",SPOOL_MODE); |
8523533c TK |
237 | } |
238 | else if (pname == NULL) { | |
2632889e | 239 | f = modefopen(fname,"wb+",SPOOL_MODE); |
8523533c TK |
240 | } |
241 | else if (fname == NULL) { | |
242 | int file_nr = 0; | |
243 | int result = 0; | |
244 | ||
245 | /* must find first free sequential filename */ | |
246 | do { | |
247 | struct stat mystat; | |
b07e6aa3 | 248 | (void)string_format(filename,2048,"%s/%s-%05u", pname, message_id, file_nr); |
8523533c TK |
249 | file_nr++; |
250 | /* security break */ | |
251 | if (file_nr >= 1024) | |
252 | break; | |
253 | result = stat(CS filename,&mystat); | |
254 | } | |
255 | while(result != -1); | |
2632889e | 256 | f = modefopen(filename,"wb+",SPOOL_MODE); |
8523533c | 257 | }; |
8e669ac1 | 258 | |
8523533c TK |
259 | /* set expansion variable */ |
260 | mime_decoded_filename = filename; | |
8e669ac1 | 261 | |
8523533c TK |
262 | return f; |
263 | } | |
264 | ||
265 | ||
266 | int mime_decode(uschar **listptr) { | |
267 | int sep = 0; | |
268 | uschar *list = *listptr; | |
269 | uschar *option; | |
270 | uschar option_buffer[1024]; | |
271 | uschar decode_path[1024]; | |
272 | FILE *decode_file = NULL; | |
8523533c TK |
273 | long f_pos = 0; |
274 | unsigned int size_counter = 0; | |
baee9eee | 275 | int (*decode_function)(FILE*, FILE*, uschar*); |
8523533c TK |
276 | |
277 | if (mime_stream == NULL) | |
278 | return FAIL; | |
8e669ac1 | 279 | |
8523533c | 280 | f_pos = ftell(mime_stream); |
8e669ac1 | 281 | |
8523533c | 282 | /* build default decode path (will exist since MBOX must be spooled up) */ |
b07e6aa3 | 283 | (void)string_format(decode_path,1024,"%s/scan/%s",spool_directory,message_id); |
8e669ac1 | 284 | |
8523533c TK |
285 | /* try to find 1st option */ |
286 | if ((option = string_nextinlist(&list, &sep, | |
287 | option_buffer, | |
288 | sizeof(option_buffer))) != NULL) { | |
8e669ac1 | 289 | |
8523533c TK |
290 | /* parse 1st option */ |
291 | if ( (Ustrcmp(option,"false") == 0) || (Ustrcmp(option,"0") == 0) ) { | |
292 | /* explicitly no decoding */ | |
293 | return FAIL; | |
294 | }; | |
8e669ac1 | 295 | |
8523533c TK |
296 | if (Ustrcmp(option,"default") == 0) { |
297 | /* explicit default path + file names */ | |
298 | goto DEFAULT_PATH; | |
299 | }; | |
8e669ac1 | 300 | |
8523533c TK |
301 | if (option[0] == '/') { |
302 | struct stat statbuf; | |
303 | ||
304 | memset(&statbuf,0,sizeof(statbuf)); | |
8e669ac1 | 305 | |
8523533c TK |
306 | /* assume either path or path+file name */ |
307 | if ( (stat(CS option, &statbuf) == 0) && S_ISDIR(statbuf.st_mode) ) | |
308 | /* is directory, use it as decode_path */ | |
309 | decode_file = mime_get_decode_file(option, NULL); | |
310 | else | |
311 | /* does not exist or is a file, use as full file name */ | |
312 | decode_file = mime_get_decode_file(NULL, option); | |
313 | } | |
314 | else | |
315 | /* assume file name only, use default path */ | |
316 | decode_file = mime_get_decode_file(decode_path, option); | |
317 | } | |
318 | else | |
319 | /* no option? patch default path */ | |
320 | DEFAULT_PATH: decode_file = mime_get_decode_file(decode_path, NULL); | |
8e669ac1 | 321 | |
8523533c TK |
322 | if (decode_file == NULL) |
323 | return DEFER; | |
8e669ac1 | 324 | |
baee9eee NM |
325 | /* decode according to mime type */ |
326 | if (mime_content_transfer_encoding == NULL) | |
327 | /* no encoding, dump as-is */ | |
328 | decode_function = mime_decode_asis; | |
329 | else if (Ustrcmp(mime_content_transfer_encoding, "base64") == 0) | |
330 | decode_function = mime_decode_base64; | |
331 | else if (Ustrcmp(mime_content_transfer_encoding, "quoted-printable") == 0) | |
332 | decode_function = mime_decode_qp; | |
333 | else | |
334 | /* unknown encoding type, just dump as-is */ | |
335 | decode_function = mime_decode_asis; | |
8e669ac1 | 336 | |
baee9eee | 337 | size_counter = decode_function(mime_stream, decode_file, mime_current_boundary); |
8e669ac1 | 338 | |
8523533c | 339 | clearerr(mime_stream); |
baee9eee | 340 | fseek(mime_stream, f_pos, SEEK_SET); |
8e669ac1 | 341 | |
61da1593 | 342 | if (fclose(decode_file) != 0 || size_counter < 0) |
baee9eee NM |
343 | return DEFER; |
344 | ||
345 | /* round up to the next KiB */ | |
346 | mime_content_size = (size_counter + 1023) / 1024; | |
8e669ac1 | 347 | |
8523533c TK |
348 | return OK; |
349 | } | |
350 | ||
351 | int mime_get_header(FILE *f, uschar *header) { | |
352 | int c = EOF; | |
353 | int done = 0; | |
354 | int header_value_mode = 0; | |
355 | int header_open_brackets = 0; | |
356 | int num_copied = 0; | |
8e669ac1 | 357 | |
8523533c | 358 | while(!done) { |
8e669ac1 | 359 | |
8523533c TK |
360 | c = fgetc(f); |
361 | if (c == EOF) break; | |
8e669ac1 | 362 | |
8523533c TK |
363 | /* always skip CRs */ |
364 | if (c == '\r') continue; | |
8e669ac1 | 365 | |
8523533c TK |
366 | if (c == '\n') { |
367 | if (num_copied > 0) { | |
368 | /* look if next char is '\t' or ' ' */ | |
369 | c = fgetc(f); | |
370 | if (c == EOF) break; | |
371 | if ( (c == '\t') || (c == ' ') ) continue; | |
f1e894f3 | 372 | (void)ungetc(c,f); |
8523533c TK |
373 | }; |
374 | /* end of the header, terminate with ';' */ | |
375 | c = ';'; | |
376 | done = 1; | |
377 | }; | |
8e669ac1 | 378 | |
8523533c TK |
379 | /* skip control characters */ |
380 | if (c < 32) continue; | |
381 | ||
382 | if (header_value_mode) { | |
383 | /* --------- value mode ----------- */ | |
384 | /* skip leading whitespace */ | |
385 | if ( ((c == '\t') || (c == ' ')) && (header_value_mode == 1) ) | |
386 | continue; | |
8e669ac1 | 387 | |
8523533c TK |
388 | /* we have hit a non-whitespace char, start copying value data */ |
389 | header_value_mode = 2; | |
8e669ac1 | 390 | |
8523533c TK |
391 | /* skip quotes */ |
392 | if (c == '"') continue; | |
8e669ac1 | 393 | |
8523533c TK |
394 | /* leave value mode on ';' */ |
395 | if (c == ';') { | |
396 | header_value_mode = 0; | |
397 | }; | |
398 | /* -------------------------------- */ | |
399 | } | |
400 | else { | |
401 | /* -------- non-value mode -------- */ | |
402 | /* skip whitespace + tabs */ | |
403 | if ( (c == ' ') || (c == '\t') ) | |
404 | continue; | |
405 | if (c == '\\') { | |
406 | /* quote next char. can be used | |
407 | to escape brackets. */ | |
408 | c = fgetc(f); | |
409 | if (c == EOF) break; | |
410 | } | |
411 | else if (c == '(') { | |
412 | header_open_brackets++; | |
413 | continue; | |
414 | } | |
415 | else if ((c == ')') && header_open_brackets) { | |
416 | header_open_brackets--; | |
417 | continue; | |
418 | } | |
419 | else if ( (c == '=') && !header_open_brackets ) { | |
420 | /* enter value mode */ | |
421 | header_value_mode = 1; | |
422 | }; | |
8e669ac1 | 423 | |
8523533c TK |
424 | /* skip chars while we are in a comment */ |
425 | if (header_open_brackets > 0) | |
426 | continue; | |
427 | /* -------------------------------- */ | |
428 | }; | |
8e669ac1 | 429 | |
8523533c TK |
430 | /* copy the char to the buffer */ |
431 | header[num_copied] = (uschar)c; | |
432 | /* raise counter */ | |
433 | num_copied++; | |
8e669ac1 | 434 | |
8523533c TK |
435 | /* break if header buffer is full */ |
436 | if (num_copied > MIME_MAX_HEADER_SIZE-1) { | |
437 | done = 1; | |
438 | }; | |
439 | }; | |
440 | ||
9f093f3a | 441 | if ((num_copied > 0) && (header[num_copied-1] != ';')) { |
8523533c TK |
442 | header[num_copied-1] = ';'; |
443 | }; | |
444 | ||
445 | /* 0-terminate */ | |
446 | header[num_copied] = '\0'; | |
8e669ac1 | 447 | |
8523533c TK |
448 | /* return 0 for EOF or empty line */ |
449 | if ((c == EOF) || (num_copied == 1)) | |
450 | return 0; | |
451 | else | |
452 | return 1; | |
453 | } | |
454 | ||
455 | ||
54cdb463 PH |
456 | int mime_acl_check(uschar *acl, FILE *f, struct mime_boundary_context *context, |
457 | uschar **user_msgptr, uschar **log_msgptr) { | |
8523533c TK |
458 | int rc = OK; |
459 | uschar *header = NULL; | |
460 | struct mime_boundary_context nested_context; | |
461 | ||
462 | /* reserve a line buffer to work in */ | |
463 | header = (uschar *)malloc(MIME_MAX_HEADER_SIZE+1); | |
464 | if (header == NULL) { | |
465 | log_write(0, LOG_PANIC, | |
54cdb463 | 466 | "MIME ACL: can't allocate %d bytes of memory.", MIME_MAX_HEADER_SIZE+1); |
8523533c TK |
467 | return DEFER; |
468 | }; | |
469 | ||
470 | /* Not actually used at the moment, but will be vital to fixing | |
471 | * some RFC 2046 nonconformance later... */ | |
472 | nested_context.parent = context; | |
473 | ||
474 | /* loop through parts */ | |
475 | while(1) { | |
8e669ac1 | 476 | |
8523533c | 477 | /* reset all per-part mime variables */ |
f7b63901 | 478 | mime_anomaly_level = 0; |
8523533c TK |
479 | mime_anomaly_text = NULL; |
480 | mime_boundary = NULL; | |
481 | mime_charset = NULL; | |
482 | mime_decoded_filename = NULL; | |
483 | mime_filename = NULL; | |
484 | mime_content_description = NULL; | |
485 | mime_content_disposition = NULL; | |
486 | mime_content_id = NULL; | |
487 | mime_content_transfer_encoding = NULL; | |
488 | mime_content_type = NULL; | |
489 | mime_is_multipart = 0; | |
490 | mime_content_size = 0; | |
8e669ac1 | 491 | |
8523533c TK |
492 | /* |
493 | If boundary is null, we assume that *f is positioned on the start of headers (for example, | |
494 | at the very beginning of a message. | |
495 | If a boundary is given, we must first advance to it to reach the start of the next header | |
496 | block. | |
497 | */ | |
8e669ac1 | 498 | |
8523533c TK |
499 | /* NOTE -- there's an error here -- RFC2046 specifically says to |
500 | * check for outer boundaries. This code doesn't do that, and | |
501 | * I haven't fixed this. | |
502 | * | |
8e669ac1 | 503 | * (I have moved partway towards adding support, however, by adding |
8523533c TK |
504 | * a "parent" field to my new boundary-context structure.) |
505 | */ | |
506 | if (context != NULL) { | |
507 | while(fgets(CS header, MIME_MAX_HEADER_SIZE, f) != NULL) { | |
508 | /* boundary line must start with 2 dashes */ | |
509 | if (Ustrncmp(header,"--",2) == 0) { | |
510 | if (Ustrncmp((header+2),context->boundary,Ustrlen(context->boundary)) == 0) { | |
511 | /* found boundary */ | |
512 | if (Ustrncmp((header+2+Ustrlen(context->boundary)),"--",2) == 0) { | |
513 | /* END boundary found */ | |
514 | debug_printf("End boundary found %s\n", context->boundary); | |
515 | return rc; | |
516 | } | |
517 | else { | |
518 | debug_printf("Next part with boundary %s\n", context->boundary); | |
519 | }; | |
520 | /* can't use break here */ | |
521 | goto DECODE_HEADERS; | |
522 | } | |
523 | }; | |
524 | } | |
525 | /* Hit EOF or read error. Ugh. */ | |
526 | debug_printf("Hit EOF ...\n"); | |
527 | return rc; | |
528 | }; | |
8e669ac1 | 529 | |
8523533c TK |
530 | DECODE_HEADERS: |
531 | /* parse headers, set up expansion variables */ | |
532 | while(mime_get_header(f,header)) { | |
533 | int i; | |
534 | /* loop through header list */ | |
535 | for (i = 0; i < mime_header_list_size; i++) { | |
536 | uschar *header_value = NULL; | |
537 | int header_value_len = 0; | |
8e669ac1 | 538 | |
8523533c TK |
539 | /* found an interesting header? */ |
540 | if (strncmpic(mime_header_list[i].name,header,mime_header_list[i].namelen) == 0) { | |
541 | uschar *p = header + mime_header_list[i].namelen; | |
542 | /* yes, grab the value (normalize to lower case) | |
543 | and copy to its corresponding expansion variable */ | |
544 | while(*p != ';') { | |
545 | *p = tolower(*p); | |
546 | p++; | |
547 | }; | |
548 | header_value_len = (p - (header + mime_header_list[i].namelen)); | |
549 | header_value = (uschar *)malloc(header_value_len+1); | |
550 | memset(header_value,0,header_value_len+1); | |
551 | p = header + mime_header_list[i].namelen; | |
552 | Ustrncpy(header_value, p, header_value_len); | |
553 | debug_printf("Found %s MIME header, value is '%s'\n", mime_header_list[i].name, header_value); | |
554 | *((uschar **)(mime_header_list[i].value)) = header_value; | |
8e669ac1 | 555 | |
8523533c TK |
556 | /* make p point to the next character after the closing ';' */ |
557 | p += (header_value_len+1); | |
8e669ac1 | 558 | |
8523533c TK |
559 | /* grab all param=value tags on the remaining line, check if they are interesting */ |
560 | NEXT_PARAM_SEARCH: while (*p != 0) { | |
561 | int j; | |
562 | for (j = 0; j < mime_parameter_list_size; j++) { | |
563 | uschar *param_value = NULL; | |
564 | int param_value_len = 0; | |
8e669ac1 | 565 | |
8523533c TK |
566 | /* found an interesting parameter? */ |
567 | if (strncmpic(mime_parameter_list[j].name,p,mime_parameter_list[j].namelen) == 0) { | |
568 | uschar *q = p + mime_parameter_list[j].namelen; | |
569 | /* yes, grab the value and copy to its corresponding expansion variable */ | |
570 | while(*q != ';') q++; | |
571 | param_value_len = (q - (p + mime_parameter_list[j].namelen)); | |
572 | param_value = (uschar *)malloc(param_value_len+1); | |
573 | memset(param_value,0,param_value_len+1); | |
574 | q = p + mime_parameter_list[j].namelen; | |
575 | Ustrncpy(param_value, q, param_value_len); | |
a0d6ba8a | 576 | param_value = rfc2047_decode(param_value, check_rfc2047_length, NULL, 32, ¶m_value_len, &q); |
8523533c TK |
577 | 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); |
578 | *((uschar **)(mime_parameter_list[j].value)) = param_value; | |
579 | p += (mime_parameter_list[j].namelen + param_value_len + 1); | |
580 | goto NEXT_PARAM_SEARCH; | |
581 | }; | |
582 | } | |
583 | /* There is something, but not one of our interesting parameters. | |
584 | Advance to the next semicolon */ | |
585 | while(*p != ';') p++; | |
586 | p++; | |
587 | }; | |
588 | }; | |
589 | }; | |
590 | }; | |
8e669ac1 | 591 | |
8523533c TK |
592 | /* set additional flag variables (easier access) */ |
593 | if ( (mime_content_type != NULL) && | |
594 | (Ustrncmp(mime_content_type,"multipart",9) == 0) ) | |
595 | mime_is_multipart = 1; | |
8e669ac1 | 596 | |
8523533c TK |
597 | /* Make a copy of the boundary pointer. |
598 | Required since mime_boundary is global | |
599 | and can be overwritten further down in recursion */ | |
600 | nested_context.boundary = mime_boundary; | |
8e669ac1 | 601 | |
8523533c TK |
602 | /* raise global counter */ |
603 | mime_part_count++; | |
8e669ac1 | 604 | |
8523533c TK |
605 | /* copy current file handle to global variable */ |
606 | mime_stream = f; | |
607 | mime_current_boundary = context ? context->boundary : 0; | |
608 | ||
609 | /* Note the context */ | |
610 | mime_is_coverletter = !(context && context->context == MBC_ATTACHMENT); | |
8e669ac1 | 611 | |
8523533c | 612 | /* call ACL handling function */ |
54cdb463 | 613 | rc = acl_check(ACL_WHERE_MIME, NULL, acl, user_msgptr, log_msgptr); |
8e669ac1 | 614 | |
8523533c TK |
615 | mime_stream = NULL; |
616 | mime_current_boundary = NULL; | |
8e669ac1 | 617 | |
8523533c | 618 | if (rc != OK) break; |
8e669ac1 | 619 | |
8523533c TK |
620 | /* If we have a multipart entity and a boundary, go recursive */ |
621 | if ( (mime_content_type != NULL) && | |
622 | (nested_context.boundary != NULL) && | |
623 | (Ustrncmp(mime_content_type,"multipart",9) == 0) ) { | |
624 | debug_printf("Entering multipart recursion, boundary '%s'\n", nested_context.boundary); | |
625 | ||
626 | if (context && context->context == MBC_ATTACHMENT) | |
627 | nested_context.context = MBC_ATTACHMENT; | |
628 | else if (!Ustrcmp(mime_content_type,"multipart/alternative") | |
629 | || !Ustrcmp(mime_content_type,"multipart/related")) | |
630 | nested_context.context = MBC_COVERLETTER_ALL; | |
631 | else | |
632 | nested_context.context = MBC_COVERLETTER_ONESHOT; | |
633 | ||
54cdb463 | 634 | rc = mime_acl_check(acl, f, &nested_context, user_msgptr, log_msgptr); |
8523533c TK |
635 | if (rc != OK) break; |
636 | } | |
637 | else if ( (mime_content_type != NULL) && | |
638 | (Ustrncmp(mime_content_type,"message/rfc822",14) == 0) ) { | |
639 | uschar *rfc822name = NULL; | |
640 | uschar filename[2048]; | |
641 | int file_nr = 0; | |
642 | int result = 0; | |
8e669ac1 | 643 | |
8523533c TK |
644 | /* must find first free sequential filename */ |
645 | do { | |
646 | struct stat mystat; | |
b07e6aa3 | 647 | (void)string_format(filename,2048,"%s/scan/%s/__rfc822_%05u", spool_directory, message_id, file_nr); |
8523533c TK |
648 | file_nr++; |
649 | /* security break */ | |
650 | if (file_nr >= 128) | |
651 | goto NO_RFC822; | |
652 | result = stat(CS filename,&mystat); | |
653 | } | |
654 | while(result != -1); | |
8e669ac1 | 655 | |
8523533c | 656 | rfc822name = filename; |
8e669ac1 | 657 | |
8523533c TK |
658 | /* decode RFC822 attachment */ |
659 | mime_decoded_filename = NULL; | |
660 | mime_stream = f; | |
661 | mime_current_boundary = context ? context->boundary : NULL; | |
662 | mime_decode(&rfc822name); | |
663 | mime_stream = NULL; | |
664 | mime_current_boundary = NULL; | |
665 | if (mime_decoded_filename == NULL) { | |
666 | /* decoding failed */ | |
667 | log_write(0, LOG_MAIN, | |
668 | "mime_regex acl condition warning - could not decode RFC822 MIME part to file."); | |
669 | return DEFER; | |
670 | }; | |
671 | mime_decoded_filename = NULL; | |
672 | }; | |
8e669ac1 | 673 | |
8523533c TK |
674 | NO_RFC822: |
675 | /* If the boundary of this instance is NULL, we are finished here */ | |
676 | if (context == NULL) break; | |
677 | ||
678 | if (context->context == MBC_COVERLETTER_ONESHOT) | |
679 | context->context = MBC_ATTACHMENT; | |
8e669ac1 | 680 | |
8523533c TK |
681 | }; |
682 | ||
683 | return rc; | |
684 | } | |
685 | ||
686 | #endif |