Commit | Line | Data |
---|---|---|
8523533c TK |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
80fea873 JH |
5 | /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004, 2015 |
6 | * License: GPL | |
7 | * Copyright (c) The Exim Maintainers 2016 | |
8 | */ | |
8523533c TK |
9 | |
10 | #include "exim.h" | |
c007c974 | 11 | #ifdef WITH_CONTENT_SCAN /* entire file */ |
8523533c TK |
12 | #include "mime.h" |
13 | #include <sys/stat.h> | |
14 | ||
15 | FILE *mime_stream = NULL; | |
16 | uschar *mime_current_boundary = NULL; | |
f2cb6292 JH |
17 | |
18 | static mime_header mime_header_list[] = { | |
19 | { US"content-type:", 13, &mime_content_type }, | |
20 | { US"content-disposition:", 20, &mime_content_disposition }, | |
21 | { US"content-transfer-encoding:", 26, &mime_content_transfer_encoding }, | |
22 | { US"content-id:", 11, &mime_content_id }, | |
23 | { US"content-description:", 20, &mime_content_description } | |
24 | }; | |
25 | ||
26 | static int mime_header_list_size = nelem(mime_header_list); | |
3c51463e JH |
27 | |
28 | static mime_parameter mime_parameter_list[] = { | |
29 | { US"name=", 5, &mime_filename }, | |
30 | { US"filename=", 9, &mime_filename }, | |
31 | { US"charset=", 8, &mime_charset }, | |
32 | { US"boundary=", 9, &mime_boundary } | |
33 | }; | |
34 | ||
8523533c TK |
35 | |
36 | /************************************************* | |
37 | * set MIME anomaly level + text * | |
38 | *************************************************/ | |
39 | ||
40 | /* Small wrapper to set the two expandables which | |
41 | give info on detected "problems" in MIME | |
f4d091fb | 42 | encodings. Indexes are defined in mime.h. */ |
8523533c | 43 | |
f4d091fb JH |
44 | void |
45 | mime_set_anomaly(int idx) | |
c007c974 | 46 | { |
f4d091fb JH |
47 | struct anom { |
48 | int level; | |
49 | const uschar * text; | |
50 | } anom[] = { {1, CUS"Broken Quoted-Printable encoding detected"}, | |
51 | {2, CUS"Broken BASE64 encoding detected"} }; | |
52 | ||
53 | mime_anomaly_level = anom[idx].level; | |
54 | mime_anomaly_text = anom[idx].text; | |
f7b63901 | 55 | } |
8523533c TK |
56 | |
57 | ||
58 | /************************************************* | |
59 | * decode quoted-printable chars * | |
60 | *************************************************/ | |
61 | ||
62 | /* gets called when we hit a = | |
63 | returns: new pointer position | |
64 | result code in c: | |
65 | -2 - decode error | |
66 | -1 - soft line break, no char | |
67 | 0-255 - char to write | |
68 | */ | |
69 | ||
f846c8f5 | 70 | static uschar * |
c007c974 JH |
71 | mime_decode_qp_char(uschar *qp_p, int *c) |
72 | { | |
73 | uschar *initial_pos = qp_p; | |
74 | ||
75 | /* advance one char */ | |
76 | qp_p++; | |
77 | ||
78 | /* Check for two hex digits and decode them */ | |
79 | if (isxdigit(*qp_p) && isxdigit(qp_p[1])) | |
80 | { | |
81 | /* Do hex conversion */ | |
82 | *c = (isdigit(*qp_p) ? *qp_p - '0' : toupper(*qp_p) - 'A' + 10) <<4; | |
83 | qp_p++; | |
84 | *c |= isdigit(*qp_p) ? *qp_p - '0' : toupper(*qp_p) - 'A' + 10; | |
85 | return qp_p + 1; | |
86 | } | |
8e669ac1 | 87 | |
c007c974 JH |
88 | /* tab or whitespace may follow just ignore it if it precedes \n */ |
89 | while (*qp_p == '\t' || *qp_p == ' ' || *qp_p == '\r') | |
8523533c | 90 | qp_p++; |
8e669ac1 | 91 | |
c007c974 JH |
92 | if (*qp_p == '\n') /* hit soft line break */ |
93 | { | |
94 | *c = -1; | |
95 | return qp_p; | |
96 | } | |
97 | ||
98 | /* illegal char here */ | |
99 | *c = -2; | |
100 | return initial_pos; | |
8523533c TK |
101 | } |
102 | ||
103 | ||
baee9eee | 104 | /* just dump MIME part without any decoding */ |
eb02738d PP |
105 | static ssize_t |
106 | mime_decode_asis(FILE* in, FILE* out, uschar* boundary) | |
baee9eee | 107 | { |
eb02738d | 108 | ssize_t len, size = 0; |
baee9eee | 109 | uschar buffer[MIME_MAX_LINE_LENGTH]; |
d203e649 | 110 | |
c007c974 JH |
111 | while(fgets(CS buffer, MIME_MAX_LINE_LENGTH, mime_stream) != NULL) |
112 | { | |
baee9eee | 113 | if (boundary != NULL |
c007c974 JH |
114 | && Ustrncmp(buffer, "--", 2) == 0 |
115 | && Ustrncmp((buffer+2), boundary, Ustrlen(boundary)) == 0 | |
116 | ) | |
baee9eee NM |
117 | break; |
118 | ||
119 | len = Ustrlen(buffer); | |
120 | if (fwrite(buffer, 1, (size_t)len, out) < len) | |
121 | return -1; | |
122 | size += len; | |
c007c974 | 123 | } /* while */ |
baee9eee NM |
124 | return size; |
125 | } | |
84330b7b | 126 | |
8523533c | 127 | |
8e669ac1 | 128 | |
baee9eee | 129 | /* decode quoted-printable MIME part */ |
eb02738d PP |
130 | static ssize_t |
131 | mime_decode_qp(FILE* in, FILE* out, uschar* boundary) | |
baee9eee | 132 | { |
c007c974 JH |
133 | uschar ibuf[MIME_MAX_LINE_LENGTH], obuf[MIME_MAX_LINE_LENGTH]; |
134 | uschar *ipos, *opos; | |
135 | ssize_t len, size = 0; | |
baee9eee | 136 | |
c007c974 | 137 | while (fgets(CS ibuf, MIME_MAX_LINE_LENGTH, in) != NULL) |
baee9eee | 138 | { |
c007c974 JH |
139 | if (boundary != NULL |
140 | && Ustrncmp(ibuf, "--", 2) == 0 | |
141 | && Ustrncmp((ibuf+2), boundary, Ustrlen(boundary)) == 0 | |
142 | ) | |
143 | break; /* todo: check for missing boundary */ | |
8523533c | 144 | |
c007c974 JH |
145 | ipos = ibuf; |
146 | opos = obuf; | |
8e669ac1 | 147 | |
c007c974 JH |
148 | while (*ipos != 0) |
149 | { | |
150 | if (*ipos == '=') | |
151 | { | |
152 | int decode_qp_result; | |
153 | ||
154 | ipos = mime_decode_qp_char(ipos, &decode_qp_result); | |
155 | ||
156 | if (decode_qp_result == -2) | |
157 | { | |
158 | /* Error from decoder. ipos is unchanged. */ | |
159 | mime_set_anomaly(MIME_ANOMALY_BROKEN_QP); | |
160 | *opos = '='; | |
161 | ++opos; | |
162 | ++ipos; | |
163 | } | |
164 | else if (decode_qp_result == -1) | |
165 | break; | |
166 | else if (decode_qp_result >= 0) | |
167 | { | |
168 | *opos = decode_qp_result; | |
169 | ++opos; | |
170 | } | |
8523533c | 171 | } |
c007c974 JH |
172 | else |
173 | { | |
174 | *opos = *ipos; | |
175 | ++opos; | |
176 | ++ipos; | |
baee9eee NM |
177 | } |
178 | } | |
c007c974 JH |
179 | /* something to write? */ |
180 | len = opos - obuf; | |
181 | if (len > 0) | |
182 | { | |
183 | if (fwrite(obuf, 1, len, out) != len) return -1; /* error */ | |
184 | size += len; | |
baee9eee | 185 | } |
8523533c | 186 | } |
c007c974 | 187 | return size; |
8523533c TK |
188 | } |
189 | ||
190 | ||
f846c8f5 | 191 | static FILE * |
c007c974 JH |
192 | mime_get_decode_file(uschar *pname, uschar *fname) |
193 | { | |
194 | FILE *f = NULL; | |
195 | uschar *filename; | |
8e669ac1 | 196 | |
c007c974 | 197 | filename = (uschar *)malloc(2048); |
8e669ac1 | 198 | |
c007c974 JH |
199 | if (pname && fname) |
200 | { | |
201 | (void)string_format(filename, 2048, "%s/%s", pname, fname); | |
202 | f = modefopen(filename,"wb+",SPOOL_MODE); | |
8523533c | 203 | } |
c007c974 JH |
204 | else if (!pname) |
205 | f = modefopen(fname,"wb+",SPOOL_MODE); | |
206 | else if (!fname) | |
207 | { | |
208 | int file_nr = 0; | |
209 | int result = 0; | |
210 | ||
211 | /* must find first free sequential filename */ | |
212 | do | |
213 | { | |
214 | struct stat mystat; | |
215 | (void)string_format(filename, 2048, | |
216 | "%s/%s-%05u", pname, message_id, file_nr++); | |
217 | /* security break */ | |
218 | if (file_nr >= 1024) | |
219 | break; | |
220 | result = stat(CS filename, &mystat); | |
221 | } while(result != -1); | |
8523533c | 222 | |
c007c974 JH |
223 | f = modefopen(filename, "wb+", SPOOL_MODE); |
224 | } | |
8e669ac1 | 225 | |
c007c974 JH |
226 | /* set expansion variable */ |
227 | mime_decoded_filename = filename; | |
8e669ac1 | 228 | |
c007c974 | 229 | return f; |
8523533c TK |
230 | } |
231 | ||
232 | ||
c007c974 | 233 | int |
55414b25 | 234 | mime_decode(const uschar **listptr) |
c007c974 JH |
235 | { |
236 | int sep = 0; | |
55414b25 | 237 | const uschar *list = *listptr; |
c007c974 JH |
238 | uschar *option; |
239 | uschar option_buffer[1024]; | |
240 | uschar decode_path[1024]; | |
241 | FILE *decode_file = NULL; | |
242 | long f_pos = 0; | |
243 | ssize_t size_counter = 0; | |
244 | ssize_t (*decode_function)(FILE*, FILE*, uschar*); | |
245 | ||
246 | if (mime_stream == NULL) | |
247 | return FAIL; | |
248 | ||
249 | f_pos = ftell(mime_stream); | |
250 | ||
251 | /* build default decode path (will exist since MBOX must be spooled up) */ | |
252 | (void)string_format(decode_path,1024,"%s/scan/%s",spool_directory,message_id); | |
253 | ||
254 | /* try to find 1st option */ | |
255 | if ((option = string_nextinlist(&list, &sep, | |
256 | option_buffer, | |
257 | sizeof(option_buffer))) != NULL) | |
258 | { | |
259 | /* parse 1st option */ | |
260 | if ( (Ustrcmp(option,"false") == 0) || (Ustrcmp(option,"0") == 0) ) | |
261 | /* explicitly no decoding */ | |
8523533c | 262 | return FAIL; |
8e669ac1 | 263 | |
c007c974 JH |
264 | if (Ustrcmp(option,"default") == 0) |
265 | /* explicit default path + file names */ | |
266 | goto DEFAULT_PATH; | |
8e669ac1 | 267 | |
c007c974 JH |
268 | if (option[0] == '/') |
269 | { | |
270 | struct stat statbuf; | |
8e669ac1 | 271 | |
c007c974 | 272 | memset(&statbuf,0,sizeof(statbuf)); |
8e669ac1 | 273 | |
c007c974 JH |
274 | /* assume either path or path+file name */ |
275 | if ( (stat(CS option, &statbuf) == 0) && S_ISDIR(statbuf.st_mode) ) | |
276 | /* is directory, use it as decode_path */ | |
277 | decode_file = mime_get_decode_file(option, NULL); | |
8523533c | 278 | else |
c007c974 JH |
279 | /* does not exist or is a file, use as full file name */ |
280 | decode_file = mime_get_decode_file(NULL, option); | |
281 | } | |
baee9eee | 282 | else |
c007c974 JH |
283 | /* assume file name only, use default path */ |
284 | decode_file = mime_get_decode_file(decode_path, option); | |
285 | } | |
286 | else | |
287 | { | |
288 | /* no option? patch default path */ | |
289 | DEFAULT_PATH: | |
290 | decode_file = mime_get_decode_file(decode_path, NULL); | |
291 | } | |
8e669ac1 | 292 | |
c007c974 JH |
293 | if (!decode_file) |
294 | return DEFER; | |
8e669ac1 | 295 | |
c007c974 JH |
296 | /* decode according to mime type */ |
297 | decode_function = | |
298 | !mime_content_transfer_encoding | |
299 | ? mime_decode_asis /* no encoding, dump as-is */ | |
300 | : Ustrcmp(mime_content_transfer_encoding, "base64") == 0 | |
301 | ? mime_decode_base64 | |
302 | : Ustrcmp(mime_content_transfer_encoding, "quoted-printable") == 0 | |
303 | ? mime_decode_qp | |
304 | : mime_decode_asis; /* unknown encoding type, just dump as-is */ | |
8e669ac1 | 305 | |
c007c974 | 306 | size_counter = decode_function(mime_stream, decode_file, mime_current_boundary); |
baee9eee | 307 | |
c007c974 | 308 | clearerr(mime_stream); |
d4ff61d1 JH |
309 | if (fseek(mime_stream, f_pos, SEEK_SET)) |
310 | return DEFER; | |
8e669ac1 | 311 | |
c007c974 JH |
312 | if (fclose(decode_file) != 0 || size_counter < 0) |
313 | return DEFER; | |
8523533c | 314 | |
c007c974 JH |
315 | /* round up to the next KiB */ |
316 | mime_content_size = (size_counter + 1023) / 1024; | |
8e669ac1 | 317 | |
c007c974 JH |
318 | return OK; |
319 | } | |
8e669ac1 | 320 | |
f846c8f5 JH |
321 | |
322 | static int | |
c007c974 JH |
323 | mime_get_header(FILE *f, uschar *header) |
324 | { | |
325 | int c = EOF; | |
326 | int done = 0; | |
327 | int header_value_mode = 0; | |
328 | int header_open_brackets = 0; | |
329 | int num_copied = 0; | |
8e669ac1 | 330 | |
c007c974 JH |
331 | while(!done) |
332 | { | |
333 | if ((c = fgetc(f)) == EOF) break; | |
334 | ||
335 | /* always skip CRs */ | |
336 | if (c == '\r') continue; | |
337 | ||
338 | if (c == '\n') | |
339 | { | |
340 | if (num_copied > 0) | |
341 | { | |
342 | /* look if next char is '\t' or ' ' */ | |
343 | if ((c = fgetc(f)) == EOF) break; | |
344 | if ( (c == '\t') || (c == ' ') ) continue; | |
345 | (void)ungetc(c,f); | |
346 | } | |
347 | /* end of the header, terminate with ';' */ | |
348 | c = ';'; | |
349 | done = 1; | |
350 | } | |
8e669ac1 | 351 | |
c007c974 JH |
352 | /* skip control characters */ |
353 | if (c < 32) continue; | |
354 | ||
355 | if (header_value_mode) | |
356 | { | |
357 | /* --------- value mode ----------- */ | |
358 | /* skip leading whitespace */ | |
359 | if ( ((c == '\t') || (c == ' ')) && (header_value_mode == 1) ) | |
360 | continue; | |
8e669ac1 | 361 | |
8523533c TK |
362 | /* we have hit a non-whitespace char, start copying value data */ |
363 | header_value_mode = 2; | |
8e669ac1 | 364 | |
1bd0d12b JH |
365 | if (c == '"') /* flip "quoted" mode */ |
366 | header_value_mode = header_value_mode==2 ? 3 : 2; | |
8e669ac1 | 367 | |
1bd0d12b JH |
368 | /* leave value mode on unquoted ';' */ |
369 | if (header_value_mode == 2 && c == ';') { | |
8523533c TK |
370 | header_value_mode = 0; |
371 | }; | |
372 | /* -------------------------------- */ | |
373 | } | |
c007c974 JH |
374 | else |
375 | { | |
376 | /* -------- non-value mode -------- */ | |
377 | /* skip whitespace + tabs */ | |
378 | if ( (c == ' ') || (c == '\t') ) | |
379 | continue; | |
380 | if (c == '\\') | |
381 | { | |
382 | /* quote next char. can be used | |
383 | to escape brackets. */ | |
384 | if ((c = fgetc(f)) == EOF) break; | |
8523533c | 385 | } |
c007c974 JH |
386 | else if (c == '(') |
387 | { | |
388 | header_open_brackets++; | |
389 | continue; | |
8523533c | 390 | } |
c007c974 JH |
391 | else if ((c == ')') && header_open_brackets) |
392 | { | |
393 | header_open_brackets--; | |
394 | continue; | |
8523533c | 395 | } |
c007c974 JH |
396 | else if ( (c == '=') && !header_open_brackets ) /* enter value mode */ |
397 | header_value_mode = 1; | |
8e669ac1 | 398 | |
c007c974 JH |
399 | /* skip chars while we are in a comment */ |
400 | if (header_open_brackets > 0) | |
401 | continue; | |
402 | /* -------------------------------- */ | |
403 | } | |
8e669ac1 | 404 | |
c007c974 JH |
405 | /* copy the char to the buffer */ |
406 | header[num_copied++] = (uschar)c; | |
8e669ac1 | 407 | |
c007c974 JH |
408 | /* break if header buffer is full */ |
409 | if (num_copied > MIME_MAX_HEADER_SIZE-1) | |
410 | done = 1; | |
411 | } | |
8523533c | 412 | |
c007c974 JH |
413 | if ((num_copied > 0) && (header[num_copied-1] != ';')) |
414 | header[num_copied-1] = ';'; | |
8523533c | 415 | |
c007c974 JH |
416 | /* 0-terminate */ |
417 | header[num_copied] = '\0'; | |
8e669ac1 | 418 | |
c007c974 JH |
419 | /* return 0 for EOF or empty line */ |
420 | if ((c == EOF) || (num_copied == 1)) | |
421 | return 0; | |
422 | else | |
423 | return 1; | |
8523533c TK |
424 | } |
425 | ||
426 | ||
f846c8f5 JH |
427 | static void |
428 | mime_vars_reset(void) | |
429 | { | |
430 | mime_anomaly_level = 0; | |
431 | mime_anomaly_text = NULL; | |
432 | mime_boundary = NULL; | |
433 | mime_charset = NULL; | |
434 | mime_decoded_filename = NULL; | |
435 | mime_filename = NULL; | |
436 | mime_content_description = NULL; | |
437 | mime_content_disposition = NULL; | |
438 | mime_content_id = NULL; | |
439 | mime_content_transfer_encoding = NULL; | |
440 | mime_content_type = NULL; | |
441 | mime_is_multipart = 0; | |
442 | mime_content_size = 0; | |
443 | } | |
444 | ||
445 | ||
446 | /* Grab a parameter value, dealing with quoting. | |
447 | ||
448 | Arguments: | |
449 | str Input string. Updated on return to point to terminating ; or NUL | |
450 | ||
451 | Return: | |
452 | Allocated string with parameter value | |
453 | */ | |
454 | static uschar * | |
455 | mime_param_val(uschar ** sp) | |
456 | { | |
457 | uschar * s = *sp; | |
458 | uschar * val = NULL; | |
459 | int size = 0, ptr = 0; | |
460 | ||
461 | /* debug_printf(" considering paramval '%s'\n", s); */ | |
462 | ||
463 | while (*s && *s != ';') /* ; terminates */ | |
464 | if (*s == '"') | |
465 | { | |
466 | s++; /* skip opening " */ | |
467 | while (*s && *s != '"') /* " protects ; */ | |
c2f669a4 | 468 | val = string_catn(val, &size, &ptr, s++, 1); |
f846c8f5 JH |
469 | if (*s) s++; /* skip closing " */ |
470 | } | |
471 | else | |
c2f669a4 | 472 | val = string_catn(val, &size, &ptr, s++, 1); |
f846c8f5 JH |
473 | if (val) val[ptr] = '\0'; |
474 | *sp = s; | |
475 | return val; | |
476 | } | |
477 | ||
478 | static uschar * | |
479 | mime_next_semicolon(uschar * s) | |
480 | { | |
481 | while (*s && *s != ';') /* ; terminates */ | |
482 | if (*s == '"') | |
483 | { | |
484 | s++; /* skip opening " */ | |
485 | while (*s && *s != '"') /* " protects ; */ | |
486 | s++; | |
487 | if (*s) s++; /* skip closing " */ | |
488 | } | |
489 | else | |
490 | s++; | |
491 | return s; | |
492 | } | |
493 | ||
494 | ||
627d1a1b JH |
495 | static uschar * |
496 | rfc2231_to_2047(const uschar * fname, const uschar * charset, int * len) | |
497 | { | |
498 | int size = 0, ptr = 0; | |
c2f669a4 | 499 | uschar * val = string_catn(NULL, &size, &ptr, US"=?", 2); |
627d1a1b JH |
500 | uschar c; |
501 | ||
622dbd6a | 502 | if (charset) |
c2f669a4 JH |
503 | val = string_cat(val, &size, &ptr, charset); |
504 | val = string_catn(val, &size, &ptr, US"?Q?", 3); | |
627d1a1b JH |
505 | |
506 | while ((c = *fname)) | |
507 | if (c == '%' && isxdigit(fname[1]) && isxdigit(fname[2])) | |
508 | { | |
c2f669a4 JH |
509 | val = string_catn(val, &size, &ptr, US"=", 1); |
510 | val = string_catn(val, &size, &ptr, ++fname, 2); | |
627d1a1b JH |
511 | fname += 2; |
512 | } | |
513 | else | |
c2f669a4 | 514 | val = string_catn(val, &size, &ptr, fname++, 1); |
627d1a1b | 515 | |
c2f669a4 | 516 | val = string_catn(val, &size, &ptr, US"?=", 2); |
627d1a1b JH |
517 | val[*len = ptr] = '\0'; |
518 | return val; | |
519 | } | |
520 | ||
521 | ||
c007c974 JH |
522 | int |
523 | mime_acl_check(uschar *acl, FILE *f, struct mime_boundary_context *context, | |
f846c8f5 | 524 | uschar **user_msgptr, uschar **log_msgptr) |
c007c974 JH |
525 | { |
526 | int rc = OK; | |
f846c8f5 | 527 | uschar * header = NULL; |
c007c974 JH |
528 | struct mime_boundary_context nested_context; |
529 | ||
530 | /* reserve a line buffer to work in */ | |
f846c8f5 | 531 | header = store_get(MIME_MAX_HEADER_SIZE+1); |
c007c974 JH |
532 | |
533 | /* Not actually used at the moment, but will be vital to fixing | |
534 | * some RFC 2046 nonconformance later... */ | |
535 | nested_context.parent = context; | |
536 | ||
537 | /* loop through parts */ | |
538 | while(1) | |
539 | { | |
540 | /* reset all per-part mime variables */ | |
f846c8f5 JH |
541 | mime_vars_reset(); |
542 | ||
543 | /* If boundary is null, we assume that *f is positioned on the start of | |
544 | headers (for example, at the very beginning of a message. If a boundary is | |
545 | given, we must first advance to it to reach the start of the next header | |
546 | block. */ | |
c007c974 JH |
547 | |
548 | /* NOTE -- there's an error here -- RFC2046 specifically says to | |
549 | * check for outer boundaries. This code doesn't do that, and | |
550 | * I haven't fixed this. | |
551 | * | |
552 | * (I have moved partway towards adding support, however, by adding | |
553 | * a "parent" field to my new boundary-context structure.) | |
554 | */ | |
f846c8f5 | 555 | if (context) for (;;) |
c007c974 | 556 | { |
f846c8f5 | 557 | if (!fgets(CS header, MIME_MAX_HEADER_SIZE, f)) |
c007c974 | 558 | { |
f846c8f5 | 559 | /* Hit EOF or read error. Ugh. */ |
622dbd6a | 560 | DEBUG(D_acl) debug_printf("MIME: Hit EOF ...\n"); |
f846c8f5 JH |
561 | return rc; |
562 | } | |
5c6cf6a0 | 563 | |
f846c8f5 JH |
564 | /* boundary line must start with 2 dashes */ |
565 | if ( Ustrncmp(header, "--", 2) == 0 | |
566 | && Ustrncmp(header+2, context->boundary, Ustrlen(context->boundary)) == 0 | |
567 | ) | |
568 | { /* found boundary */ | |
569 | if (Ustrncmp((header+2+Ustrlen(context->boundary)), "--", 2) == 0) | |
570 | { | |
571 | /* END boundary found */ | |
622dbd6a | 572 | DEBUG(D_acl) debug_printf("MIME: End boundary found %s\n", |
f846c8f5 JH |
573 | context->boundary); |
574 | return rc; | |
c007c974 | 575 | } |
f846c8f5 | 576 | |
622dbd6a | 577 | DEBUG(D_acl) debug_printf("MIME: Next part with boundary %s\n", |
f846c8f5 JH |
578 | context->boundary); |
579 | break; | |
8523533c | 580 | } |
c007c974 | 581 | } |
8e669ac1 | 582 | |
c007c974 | 583 | /* parse headers, set up expansion variables */ |
5c6cf6a0 | 584 | while (mime_get_header(f, header)) |
c007c974 | 585 | { |
f846c8f5 JH |
586 | struct mime_header * mh; |
587 | ||
588 | /* look for interesting headers */ | |
589 | for (mh = mime_header_list; | |
590 | mh < mime_header_list + mime_header_list_size; | |
591 | mh++) if (strncmpic(mh->name, header, mh->namelen) == 0) | |
592 | { | |
f846c8f5 JH |
593 | uschar * p = header + mh->namelen; |
594 | uschar * q; | |
c007c974 | 595 | |
f846c8f5 JH |
596 | /* grab the value (normalize to lower case) |
597 | and copy to its corresponding expansion variable */ | |
598 | ||
599 | for (q = p; *q != ';' && *q; q++) ; | |
600 | *mh->value = string_copynlc(p, q-p); | |
622dbd6a | 601 | DEBUG(D_acl) debug_printf("MIME: found %s header, value is '%s'\n", |
f846c8f5 JH |
602 | mh->name, *mh->value); |
603 | ||
604 | if (*(p = q)) p++; /* jump past the ; */ | |
605 | ||
606 | { | |
607 | uschar * mime_fname = NULL; | |
608 | uschar * mime_fname_rfc2231 = NULL; | |
609 | uschar * mime_filename_charset = NULL; | |
610 | BOOL decoding_failed = FALSE; | |
c007c974 | 611 | |
5c6cf6a0 JH |
612 | /* grab all param=value tags on the remaining line, |
613 | check if they are interesting */ | |
f846c8f5 | 614 | |
5c6cf6a0 | 615 | while (*p) |
c007c974 JH |
616 | { |
617 | mime_parameter * mp; | |
f846c8f5 | 618 | |
622dbd6a | 619 | DEBUG(D_acl) debug_printf("MIME: considering paramlist '%s'\n", p); |
f846c8f5 JH |
620 | |
621 | if ( !mime_filename | |
fc362fc5 JH |
622 | && strncmpic(CUS"content-disposition:", header, 20) == 0 |
623 | && strncmpic(CUS"filename*", p, 9) == 0 | |
f846c8f5 JH |
624 | ) |
625 | { /* RFC 2231 filename */ | |
626 | uschar * q; | |
627 | ||
628 | /* find value of the filename */ | |
629 | p += 9; | |
630 | while(*p != '=' && *p) p++; | |
631 | if (*p) p++; /* p is filename or NUL */ | |
632 | q = mime_param_val(&p); /* p now trailing ; or NUL */ | |
633 | ||
634 | if (q && *q) | |
c007c974 | 635 | { |
f846c8f5 JH |
636 | uschar * temp_string, * err_msg; |
637 | int slen; | |
4fd5d2bf | 638 | |
f846c8f5 JH |
639 | /* build up an un-decoded filename over successive |
640 | filename*= parameters (for use when 2047 decode fails) */ | |
641 | ||
642 | mime_fname_rfc2231 = string_sprintf("%#s%s", | |
643 | mime_fname_rfc2231, q); | |
644 | ||
645 | if (!decoding_failed) | |
646 | { | |
647 | int size; | |
648 | if (!mime_filename_charset) | |
4fd5d2bf | 649 | { |
f846c8f5 JH |
650 | uschar * s = q; |
651 | ||
652 | /* look for a ' in the "filename" */ | |
622dbd6a | 653 | while(*s != '\'' && *s) s++; /* s is 1st ' or NUL */ |
f846c8f5 JH |
654 | |
655 | if ((size = s-q) > 0) | |
f846c8f5 | 656 | mime_filename_charset = string_copyn(q, size); |
f846c8f5 | 657 | |
622dbd6a JH |
658 | if (*(p = s)) p++; |
659 | while(*p == '\'') p++; /* p is after 2nd ' */ | |
4fd5d2bf JH |
660 | } |
661 | else | |
f846c8f5 | 662 | p = q; |
5c6cf6a0 | 663 | |
622dbd6a JH |
664 | DEBUG(D_acl) debug_printf("MIME: charset %s fname '%s'\n", |
665 | mime_filename_charset ? mime_filename_charset : US"<NULL>", p); | |
666 | ||
627d1a1b | 667 | temp_string = rfc2231_to_2047(p, mime_filename_charset, &slen); |
622dbd6a JH |
668 | DEBUG(D_acl) debug_printf("MIME: 2047-name %s\n", temp_string); |
669 | ||
670 | temp_string = rfc2047_decode(temp_string, FALSE, NULL, ' ', | |
f846c8f5 | 671 | NULL, &err_msg); |
622dbd6a JH |
672 | DEBUG(D_acl) debug_printf("MIME: plain-name %s\n", temp_string); |
673 | ||
f846c8f5 JH |
674 | size = Ustrlen(temp_string); |
675 | ||
676 | if (size == slen) | |
677 | decoding_failed = TRUE; | |
678 | else | |
679 | /* build up a decoded filename over successive | |
680 | filename*= parameters */ | |
681 | ||
682 | mime_filename = mime_fname = mime_fname | |
683 | ? string_sprintf("%s%s", mime_fname, temp_string) | |
684 | : temp_string; | |
93cad488 | 685 | } |
f846c8f5 | 686 | } |
5c6cf6a0 | 687 | } |
f846c8f5 | 688 | |
e7c25d5b | 689 | else |
f846c8f5 JH |
690 | /* look for interesting parameters */ |
691 | for (mp = mime_parameter_list; | |
692 | mp < mime_parameter_list + nelem(mime_parameter_list); | |
693 | mp++ | |
694 | ) if (strncmpic(mp->name, p, mp->namelen) == 0) | |
695 | { | |
696 | uschar * q; | |
697 | uschar * dummy_errstr; | |
698 | ||
699 | /* grab the value and copy to its expansion variable */ | |
700 | p += mp->namelen; | |
701 | q = mime_param_val(&p); /* p now trailing ; or NUL */ | |
702 | ||
703 | *mp->value = q && *q | |
704 | ? rfc2047_decode(q, check_rfc2047_length, NULL, 32, NULL, | |
705 | &dummy_errstr) | |
706 | : NULL; | |
707 | DEBUG(D_acl) debug_printf( | |
622dbd6a | 708 | "MIME: found %s parameter in %s header, value '%s'\n", |
f846c8f5 JH |
709 | mp->name, mh->name, *mp->value); |
710 | ||
711 | break; /* done matching param names */ | |
712 | } | |
713 | ||
714 | ||
715 | /* There is something, but not one of our interesting parameters. | |
716 | Advance past the next semicolon */ | |
717 | p = mime_next_semicolon(p); | |
718 | if (*p) p++; | |
719 | } /* param scan on line */ | |
720 | ||
fc362fc5 | 721 | if (strncmpic(CUS"content-disposition:", header, 20) == 0) |
f846c8f5 JH |
722 | { |
723 | if (decoding_failed) mime_filename = mime_fname_rfc2231; | |
724 | ||
725 | DEBUG(D_acl) debug_printf( | |
622dbd6a | 726 | "MIME: found %s parameter in %s header, value is '%s'\n", |
f846c8f5 JH |
727 | "filename", mh->name, mime_filename); |
728 | } | |
c007c974 JH |
729 | } |
730 | } | |
f846c8f5 | 731 | } |
8e669ac1 | 732 | |
c007c974 | 733 | /* set additional flag variables (easier access) */ |
f846c8f5 JH |
734 | if ( mime_content_type |
735 | && Ustrncmp(mime_content_type,"multipart",9) == 0 | |
736 | ) | |
c007c974 | 737 | mime_is_multipart = 1; |
8e669ac1 | 738 | |
c007c974 JH |
739 | /* Make a copy of the boundary pointer. |
740 | Required since mime_boundary is global | |
741 | and can be overwritten further down in recursion */ | |
742 | nested_context.boundary = mime_boundary; | |
8e669ac1 | 743 | |
c007c974 JH |
744 | /* raise global counter */ |
745 | mime_part_count++; | |
8523533c | 746 | |
c007c974 JH |
747 | /* copy current file handle to global variable */ |
748 | mime_stream = f; | |
749 | mime_current_boundary = context ? context->boundary : 0; | |
8e669ac1 | 750 | |
c007c974 JH |
751 | /* Note the context */ |
752 | mime_is_coverletter = !(context && context->context == MBC_ATTACHMENT); | |
8e669ac1 | 753 | |
c007c974 JH |
754 | /* call ACL handling function */ |
755 | rc = acl_check(ACL_WHERE_MIME, NULL, acl, user_msgptr, log_msgptr); | |
8e669ac1 | 756 | |
c007c974 JH |
757 | mime_stream = NULL; |
758 | mime_current_boundary = NULL; | |
759 | ||
760 | if (rc != OK) break; | |
8e669ac1 | 761 | |
c007c974 JH |
762 | /* If we have a multipart entity and a boundary, go recursive */ |
763 | if ( (mime_content_type != NULL) && | |
764 | (nested_context.boundary != NULL) && | |
765 | (Ustrncmp(mime_content_type,"multipart",9) == 0) ) | |
766 | { | |
622dbd6a JH |
767 | DEBUG(D_acl) |
768 | debug_printf("MIME: Entering multipart recursion, boundary '%s'\n", | |
769 | nested_context.boundary); | |
c007c974 JH |
770 | |
771 | nested_context.context = | |
772 | context && context->context == MBC_ATTACHMENT | |
773 | ? MBC_ATTACHMENT | |
774 | : Ustrcmp(mime_content_type,"multipart/alternative") == 0 | |
775 | || Ustrcmp(mime_content_type,"multipart/related") == 0 | |
776 | ? MBC_COVERLETTER_ALL | |
777 | : MBC_COVERLETTER_ONESHOT; | |
778 | ||
779 | rc = mime_acl_check(acl, f, &nested_context, user_msgptr, log_msgptr); | |
780 | if (rc != OK) break; | |
8523533c | 781 | } |
c007c974 JH |
782 | else if ( (mime_content_type != NULL) && |
783 | (Ustrncmp(mime_content_type,"message/rfc822",14) == 0) ) | |
784 | { | |
55414b25 | 785 | const uschar *rfc822name = NULL; |
c007c974 JH |
786 | uschar filename[2048]; |
787 | int file_nr = 0; | |
788 | int result = 0; | |
8e669ac1 | 789 | |
c007c974 JH |
790 | /* must find first free sequential filename */ |
791 | do | |
792 | { | |
793 | struct stat mystat; | |
794 | (void)string_format(filename, 2048, | |
795 | "%s/scan/%s/__rfc822_%05u", spool_directory, message_id, file_nr++); | |
796 | /* security break */ | |
797 | if (file_nr >= 128) | |
798 | goto NO_RFC822; | |
799 | result = stat(CS filename,&mystat); | |
800 | } while (result != -1); | |
801 | ||
802 | rfc822name = filename; | |
803 | ||
804 | /* decode RFC822 attachment */ | |
805 | mime_decoded_filename = NULL; | |
806 | mime_stream = f; | |
807 | mime_current_boundary = context ? context->boundary : NULL; | |
808 | mime_decode(&rfc822name); | |
809 | mime_stream = NULL; | |
810 | mime_current_boundary = NULL; | |
811 | if (!mime_decoded_filename) /* decoding failed */ | |
812 | { | |
813 | log_write(0, LOG_MAIN, | |
814 | "mime_regex acl condition warning - could not decode RFC822 MIME part to file."); | |
f846c8f5 JH |
815 | rc = DEFER; |
816 | goto out; | |
c007c974 JH |
817 | } |
818 | mime_decoded_filename = NULL; | |
819 | } | |
8523533c | 820 | |
c007c974 JH |
821 | NO_RFC822: |
822 | /* If the boundary of this instance is NULL, we are finished here */ | |
f846c8f5 | 823 | if (!context) break; |
8e669ac1 | 824 | |
c007c974 JH |
825 | if (context->context == MBC_COVERLETTER_ONESHOT) |
826 | context->context = MBC_ATTACHMENT; | |
827 | } | |
8523533c | 828 | |
f846c8f5 JH |
829 | out: |
830 | mime_vars_reset(); | |
c007c974 | 831 | return rc; |
8523533c TK |
832 | } |
833 | ||
c007c974 JH |
834 | #endif /*WITH_CONTENT_SCAN*/ |
835 | ||
836 | /* vi: sw ai sw=2 | |
837 | */ |