1 /*
2 * Copyright (c) 1998-2004, 2006, 2007 Proofpoint, Inc. and its suppliers.
3 * All rights reserved.
4 * Copyright (c) 1983, 1995-1997 Eric P. Allman. All rights reserved.
5 * Copyright (c) 1988, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * By using this file, you agree to the terms and conditions set
9 * forth in the LICENSE file which can be found at the top level of
10 * the sendmail distribution.
11 *
12 */
13
14 #include <sendmail.h>
15 #include <sm/sendmail.h>
16
17 SM_RCSID("@(#)$Id: headers.c,v 8.320 2013-11-22 20:51:55 ca Exp $")
18
19 static HDR *allocheader __P((char *, char *, int, SM_RPOOL_T *, bool));
20 static size_t fix_mime_header __P((HDR *, ENVELOPE *));
21 static int priencode __P((char *));
22 static bool put_vanilla_header __P((HDR *, char *, MCI *));
23
24 /*
25 ** SETUPHEADERS -- initialize headers in symbol table
26 **
27 ** Parameters:
28 ** none
29 **
30 ** Returns:
31 ** none
32 */
33
34 void
setupheaders()35 setupheaders()
36 {
37 struct hdrinfo *hi;
38 STAB *s;
39
40 for (hi = HdrInfo; hi->hi_field != NULL; hi++)
41 {
42 s = stab(hi->hi_field, ST_HEADER, ST_ENTER);
43 s->s_header.hi_flags = hi->hi_flags;
44 s->s_header.hi_ruleset = NULL;
45 }
46 }
47
48 /*
49 ** DOCHOMPHEADER -- process and save a header line.
50 **
51 ** Called by chompheader.
52 **
53 ** Parameters:
54 ** line -- header as a text line.
55 ** pflag -- flags for chompheader() (from sendmail.h)
56 ** hdrp -- a pointer to the place to save the header.
57 ** e -- the envelope including this header.
58 **
59 ** Returns:
60 ** flags for this header.
61 **
62 ** Side Effects:
63 ** The header is saved on the header list.
64 ** Contents of 'line' are destroyed.
65 */
66
67 static struct hdrinfo NormalHeader = { NULL, 0, NULL };
68 static unsigned long dochompheader __P((char *, int, HDR **, ENVELOPE *));
69
70 static unsigned long
dochompheader(line,pflag,hdrp,e)71 dochompheader(line, pflag, hdrp, e)
72 char *line;
73 int pflag;
74 HDR **hdrp;
75 ENVELOPE *e;
76 {
77 unsigned char mid = '\0';
78 register char *p;
79 register HDR *h;
80 HDR **hp;
81 char *fname;
82 char *fvalue;
83 bool cond = false;
84 bool dropfrom;
85 bool headeronly;
86 STAB *s;
87 struct hdrinfo *hi;
88 bool nullheader = false;
89 BITMAP256 mopts;
90
91 headeronly = hdrp != NULL;
92 if (!headeronly)
93 hdrp = &e->e_header;
94
95 /* strip off options */
96 clrbitmap(mopts);
97 p = line;
98 if (!bitset(pflag, CHHDR_USER) && *p == '?')
99 {
100 int c;
101 register char *q;
102
103 q = strchr(++p, '?');
104 if (q == NULL)
105 goto hse;
106
107 *q = '\0';
108 c = *p & 0377;
109
110 /* possibly macro conditional */
111 if (c == MACROEXPAND)
112 {
113 /* catch ?$? */
114 if (*++p == '\0')
115 {
116 *q = '?';
117 goto hse;
118 }
119
120 mid = (unsigned char) *p++;
121
122 /* catch ?$abc? */
123 if (*p != '\0')
124 {
125 *q = '?';
126 goto hse;
127 }
128 }
129 else if (*p == '$')
130 {
131 /* catch ?$? */
132 if (*++p == '\0')
133 {
134 *q = '?';
135 goto hse;
136 }
137
138 mid = (unsigned char) macid(p);
139 if (bitset(0200, mid))
140 {
141 p += strlen(macname(mid)) + 2;
142 SM_ASSERT(p <= q);
143 }
144 else
145 p++;
146
147 /* catch ?$abc? */
148 if (*p != '\0')
149 {
150 *q = '?';
151 goto hse;
152 }
153 }
154 else
155 {
156 while (*p != '\0')
157 {
158 if (!isascii(*p))
159 {
160 *q = '?';
161 goto hse;
162 }
163
164 setbitn(bitidx(*p), mopts);
165 cond = true;
166 p++;
167 }
168 }
169 p = q + 1;
170 }
171
172 /* find canonical name */
173 fname = p;
174 while (isascii(*p) && isgraph(*p) && *p != ':')
175 p++;
176 fvalue = p;
177 while (isascii(*p) && isspace(*p))
178 p++;
179 if (*p++ != ':' || fname == fvalue)
180 {
181 hse:
182 syserr("553 5.3.0 header syntax error, line \"%s\"", line);
183 return 0;
184 }
185 *fvalue = '\0';
186 fvalue = p;
187
188 /* if the field is null, go ahead and use the default */
189 while (isascii(*p) && isspace(*p))
190 p++;
191 if (*p == '\0')
192 nullheader = true;
193
194 /* security scan: long field names are end-of-header */
195 if (strlen(fname) > 100)
196 return H_EOH;
197
198 /* check to see if it represents a ruleset call */
199 if (bitset(pflag, CHHDR_DEF))
200 {
201 char hbuf[50];
202
203 (void) expand(fvalue, hbuf, sizeof(hbuf), e);
204 for (p = hbuf; isascii(*p) && isspace(*p); )
205 p++;
206 if ((*p++ & 0377) == CALLSUBR)
207 {
208 auto char *endp;
209 bool strc;
210
211 strc = *p == '+'; /* strip comments? */
212 if (strc)
213 ++p;
214 if (strtorwset(p, &endp, ST_ENTER) > 0)
215 {
216 *endp = '\0';
217 s = stab(fname, ST_HEADER, ST_ENTER);
218 if (LogLevel > 9 &&
219 s->s_header.hi_ruleset != NULL)
220 sm_syslog(LOG_WARNING, NOQID,
221 "Warning: redefined ruleset for header=%s, old=%s, new=%s",
222 fname,
223 s->s_header.hi_ruleset, p);
224 s->s_header.hi_ruleset = newstr(p);
225 if (!strc)
226 s->s_header.hi_flags |= H_STRIPCOMM;
227 }
228 return 0;
229 }
230 }
231
232 /* see if it is a known type */
233 s = stab(fname, ST_HEADER, ST_FIND);
234 if (s != NULL)
235 hi = &s->s_header;
236 else
237 hi = &NormalHeader;
238
239 if (tTd(31, 9))
240 {
241 if (s == NULL)
242 sm_dprintf("no header flags match\n");
243 else
244 sm_dprintf("header match, flags=%lx, ruleset=%s\n",
245 hi->hi_flags,
246 hi->hi_ruleset == NULL ? "<NULL>"
247 : hi->hi_ruleset);
248 }
249
250 /* see if this is a resent message */
251 if (!bitset(pflag, CHHDR_DEF) && !headeronly &&
252 bitset(H_RESENT, hi->hi_flags))
253 e->e_flags |= EF_RESENT;
254
255 /* if this is an Errors-To: header keep track of it now */
256 if (UseErrorsTo && !bitset(pflag, CHHDR_DEF) && !headeronly &&
257 bitset(H_ERRORSTO, hi->hi_flags))
258 (void) sendtolist(fvalue, NULLADDR, &e->e_errorqueue, 0, e);
259
260 /* if this means "end of header" quit now */
261 if (!headeronly && bitset(H_EOH, hi->hi_flags))
262 return hi->hi_flags;
263
264 /*
265 ** Horrible hack to work around problem with Lotus Notes SMTP
266 ** mail gateway, which generates From: headers with newlines in
267 ** them and the <address> on the second line. Although this is
268 ** legal RFC 822, many MUAs don't handle this properly and thus
269 ** never find the actual address.
270 */
271
272 if (bitset(H_FROM, hi->hi_flags) && SingleLineFromHeader)
273 {
274 while ((p = strchr(fvalue, '\n')) != NULL)
275 *p = ' ';
276 }
277
278 /*
279 ** If there is a check ruleset, verify it against the header.
280 */
281
282 if (bitset(pflag, CHHDR_CHECK))
283 {
284 int rscheckflags;
285 char *rs;
286
287 rscheckflags = RSF_COUNT;
288 if (!bitset(hi->hi_flags, H_FROM|H_RCPT))
289 rscheckflags |= RSF_UNSTRUCTURED;
290
291 /* no ruleset? look for default */
292 rs = hi->hi_ruleset;
293 if (rs == NULL)
294 {
295 s = stab("*", ST_HEADER, ST_FIND);
296 if (s != NULL)
297 {
298 rs = (&s->s_header)->hi_ruleset;
299 if (bitset((&s->s_header)->hi_flags,
300 H_STRIPCOMM))
301 rscheckflags |= RSF_RMCOMM;
302 }
303 }
304 else if (bitset(hi->hi_flags, H_STRIPCOMM))
305 rscheckflags |= RSF_RMCOMM;
306 if (rs != NULL)
307 {
308 int l, k;
309 char qval[MAXNAME];
310
311 l = 0;
312 qval[l++] = '"';
313
314 /* - 3 to avoid problems with " at the end */
315 /* should be sizeof(qval), not MAXNAME */
316 for (k = 0; fvalue[k] != '\0' && l < MAXNAME - 3; k++)
317 {
318 switch (fvalue[k])
319 {
320 /* XXX other control chars? */
321 case '\011': /* ht */
322 case '\012': /* nl */
323 case '\013': /* vt */
324 case '\014': /* np */
325 case '\015': /* cr */
326 qval[l++] = ' ';
327 break;
328 case '"':
329 qval[l++] = '\\';
330 /* FALLTHROUGH */
331 default:
332 qval[l++] = fvalue[k];
333 break;
334 }
335 }
336 qval[l++] = '"';
337 qval[l] = '\0';
338 k += strlen(fvalue + k);
339 if (k >= MAXNAME)
340 {
341 if (LogLevel > 9)
342 sm_syslog(LOG_WARNING, e->e_id,
343 "Warning: truncated header '%s' before check with '%s' len=%d max=%d",
344 fname, rs, k, MAXNAME - 1);
345 }
346 macdefine(&e->e_macro, A_TEMP,
347 macid("{currHeader}"), qval);
348 macdefine(&e->e_macro, A_TEMP,
349 macid("{hdr_name}"), fname);
350
351 (void) sm_snprintf(qval, sizeof(qval), "%d", k);
352 macdefine(&e->e_macro, A_TEMP, macid("{hdrlen}"), qval);
353 if (bitset(H_FROM, hi->hi_flags))
354 macdefine(&e->e_macro, A_PERM,
355 macid("{addr_type}"), "h s");
356 else if (bitset(H_RCPT, hi->hi_flags))
357 macdefine(&e->e_macro, A_PERM,
358 macid("{addr_type}"), "h r");
359 else
360 macdefine(&e->e_macro, A_PERM,
361 macid("{addr_type}"), "h");
362 (void) rscheck(rs, fvalue, NULL, e, rscheckflags, 3,
363 NULL, e->e_id, NULL, NULL);
364 }
365 }
366
367 /*
368 ** Drop explicit From: if same as what we would generate.
369 ** This is to make MH (which doesn't always give a full name)
370 ** insert the full name information in all circumstances.
371 */
372
373 dropfrom = false;
374 p = "resent-from";
375 if (!bitset(EF_RESENT, e->e_flags))
376 p += 7;
377 if (!bitset(pflag, CHHDR_DEF) && !headeronly &&
378 !bitset(EF_QUEUERUN, e->e_flags) && sm_strcasecmp(fname, p) == 0)
379 {
380 if (e->e_from.q_paddr != NULL &&
381 e->e_from.q_mailer != NULL &&
382 bitnset(M_LOCALMAILER, e->e_from.q_mailer->m_flags) &&
383 (strcmp(fvalue, e->e_from.q_paddr) == 0 ||
384 strcmp(fvalue, e->e_from.q_user) == 0))
385 dropfrom = true;
386 if (tTd(31, 2))
387 {
388 sm_dprintf("comparing header from (%s) against default (%s or %s), drop=%d\n",
389 fvalue, e->e_from.q_paddr, e->e_from.q_user,
390 dropfrom);
391 }
392 }
393
394 /* delete default value for this header */
395 for (hp = hdrp; (h = *hp) != NULL; hp = &h->h_link)
396 {
397 if (sm_strcasecmp(fname, h->h_field) == 0 &&
398 !bitset(H_USER, h->h_flags) &&
399 !bitset(H_FORCE, h->h_flags))
400 {
401 if (nullheader)
402 {
403 /* user-supplied value was null */
404 return 0;
405 }
406 if (dropfrom)
407 {
408 /* make this look like the user entered it */
409 h->h_flags |= H_USER;
410
411 /*
412 ** If the MH hack is selected, allow to turn
413 ** it off via a mailer flag to avoid problems
414 ** with setups that remove the F flag from
415 ** the RCPT mailer.
416 */
417
418 if (bitnset(M_NOMHHACK,
419 e->e_from.q_mailer->m_flags))
420 {
421 h->h_flags &= ~H_CHECK;
422 }
423 return hi->hi_flags;
424 }
425 h->h_value = NULL;
426 if (!cond)
427 {
428 /* copy conditions from default case */
429 memmove((char *) mopts, (char *) h->h_mflags,
430 sizeof(mopts));
431 }
432 h->h_macro = mid;
433 }
434 }
435
436 /* create a new node */
437 h = (HDR *) sm_rpool_malloc_x(e->e_rpool, sizeof(*h));
438 h->h_field = sm_rpool_strdup_x(e->e_rpool, fname);
439 h->h_value = sm_rpool_strdup_x(e->e_rpool, fvalue);
440 h->h_link = NULL;
441 memmove((char *) h->h_mflags, (char *) mopts, sizeof(mopts));
442 h->h_macro = mid;
443 *hp = h;
444 h->h_flags = hi->hi_flags;
445 if (bitset(pflag, CHHDR_USER) || bitset(pflag, CHHDR_QUEUE))
446 h->h_flags |= H_USER;
447
448 /* strip EOH flag if parsing MIME headers */
449 if (headeronly)
450 h->h_flags &= ~H_EOH;
451 if (bitset(pflag, CHHDR_DEF))
452 h->h_flags |= H_DEFAULT;
453 if (cond || mid != '\0')
454 h->h_flags |= H_CHECK;
455
456 /* hack to see if this is a new format message */
457 if (!bitset(pflag, CHHDR_DEF) && !headeronly &&
458 bitset(H_RCPT|H_FROM, h->h_flags) &&
459 (strchr(fvalue, ',') != NULL || strchr(fvalue, '(') != NULL ||
460 strchr(fvalue, '<') != NULL || strchr(fvalue, ';') != NULL))
461 {
462 e->e_flags &= ~EF_OLDSTYLE;
463 }
464
465 return h->h_flags;
466 }
467
468 /*
469 ** CHOMPHEADER -- process and save a header line.
470 **
471 ** Called by collect, readcf, and readqf to deal with header lines.
472 ** This is just a wrapper for dochompheader().
473 **
474 ** Parameters:
475 ** line -- header as a text line.
476 ** pflag -- flags for chompheader() (from sendmail.h)
477 ** hdrp -- a pointer to the place to save the header.
478 ** e -- the envelope including this header.
479 **
480 ** Returns:
481 ** flags for this header.
482 **
483 ** Side Effects:
484 ** The header is saved on the header list.
485 ** Contents of 'line' are destroyed.
486 */
487
488
489 unsigned long
chompheader(line,pflag,hdrp,e)490 chompheader(line, pflag, hdrp, e)
491 char *line;
492 int pflag;
493 HDR **hdrp;
494 register ENVELOPE *e;
495 {
496 unsigned long rval;
497
498 if (tTd(31, 6))
499 {
500 sm_dprintf("chompheader: ");
501 xputs(sm_debug_file(), line);
502 sm_dprintf("\n");
503 }
504
505 /* quote this if user (not config file) input */
506 if (bitset(pflag, CHHDR_USER))
507 {
508 char xbuf[MAXLINE];
509 char *xbp = NULL;
510 int xbufs;
511
512 xbufs = sizeof(xbuf);
513 xbp = quote_internal_chars(line, xbuf, &xbufs);
514 if (tTd(31, 7))
515 {
516 sm_dprintf("chompheader: quoted: ");
517 xputs(sm_debug_file(), xbp);
518 sm_dprintf("\n");
519 }
520 rval = dochompheader(xbp, pflag, hdrp, e);
521 if (xbp != xbuf)
522 sm_free(xbp);
523 }
524 else
525 rval = dochompheader(line, pflag, hdrp, e);
526
527 return rval;
528 }
529
530 /*
531 ** ALLOCHEADER -- allocate a header entry
532 **
533 ** Parameters:
534 ** field -- the name of the header field (will not be copied).
535 ** value -- the value of the field (will be copied).
536 ** flags -- flags to add to h_flags.
537 ** rp -- resource pool for allocations
538 ** space -- add leading space?
539 **
540 ** Returns:
541 ** Pointer to a newly allocated and populated HDR.
542 **
543 ** Notes:
544 ** o field and value must be in internal format, i.e.,
545 ** metacharacters must be "quoted", see quote_internal_chars().
546 ** o maybe add more flags to decide:
547 ** - what to copy (field/value)
548 ** - whether to convert value to an internal format
549 */
550
551 static HDR *
allocheader(field,value,flags,rp,space)552 allocheader(field, value, flags, rp, space)
553 char *field;
554 char *value;
555 int flags;
556 SM_RPOOL_T *rp;
557 bool space;
558 {
559 HDR *h;
560 STAB *s;
561
562 /* find info struct */
563 s = stab(field, ST_HEADER, ST_FIND);
564
565 /* allocate space for new header */
566 h = (HDR *) sm_rpool_malloc_x(rp, sizeof(*h));
567 h->h_field = field;
568 if (space)
569 {
570 size_t l;
571 char *n;
572
573 l = strlen(value);
574 SM_ASSERT(l + 2 > l);
575 n = sm_rpool_malloc_x(rp, l + 2);
576 n[0] = ' ';
577 n[1] = '\0';
578 sm_strlcpy(n + 1, value, l + 1);
579 h->h_value = n;
580 }
581 else
582 h->h_value = sm_rpool_strdup_x(rp, value);
583 h->h_flags = flags;
584 if (s != NULL)
585 h->h_flags |= s->s_header.hi_flags;
586 clrbitmap(h->h_mflags);
587 h->h_macro = '\0';
588
589 return h;
590 }
591
592 /*
593 ** ADDHEADER -- add a header entry to the end of the queue.
594 **
595 ** This bypasses the special checking of chompheader.
596 **
597 ** Parameters:
598 ** field -- the name of the header field (will not be copied).
599 ** value -- the value of the field (will be copied).
600 ** flags -- flags to add to h_flags.
601 ** e -- envelope.
602 ** space -- add leading space?
603 **
604 ** Returns:
605 ** none.
606 **
607 ** Side Effects:
608 ** adds the field on the list of headers for this envelope.
609 **
610 ** Notes: field and value must be in internal format, i.e.,
611 ** metacharacters must be "quoted", see quote_internal_chars().
612 */
613
614 void
addheader(field,value,flags,e,space)615 addheader(field, value, flags, e, space)
616 char *field;
617 char *value;
618 int flags;
619 ENVELOPE *e;
620 bool space;
621 {
622 register HDR *h;
623 HDR **hp;
624 HDR **hdrlist = &e->e_header;
625
626 /* find current place in list -- keep back pointer? */
627 for (hp = hdrlist; (h = *hp) != NULL; hp = &h->h_link)
628 {
629 if (sm_strcasecmp(field, h->h_field) == 0)
630 break;
631 }
632
633 /* allocate space for new header */
634 h = allocheader(field, value, flags, e->e_rpool, space);
635 h->h_link = *hp;
636 *hp = h;
637 }
638
639 /*
640 ** INSHEADER -- insert a header entry at the specified index
641 ** This bypasses the special checking of chompheader.
642 **
643 ** Parameters:
644 ** idx -- index into the header list at which to insert
645 ** field -- the name of the header field (will be copied).
646 ** value -- the value of the field (will be copied).
647 ** flags -- flags to add to h_flags.
648 ** e -- envelope.
649 ** space -- add leading space?
650 **
651 ** Returns:
652 ** none.
653 **
654 ** Side Effects:
655 ** inserts the field on the list of headers for this envelope.
656 **
657 ** Notes:
658 ** - field and value must be in internal format, i.e.,
659 ** metacharacters must be "quoted", see quote_internal_chars().
660 ** - the header list contains headers that might not be
661 ** sent "out" (see putheader(): "skip"), hence there is no
662 ** reliable way to insert a header at an exact position
663 ** (except at the front or end).
664 */
665
666 void
insheader(idx,field,value,flags,e,space)667 insheader(idx, field, value, flags, e, space)
668 int idx;
669 char *field;
670 char *value;
671 int flags;
672 ENVELOPE *e;
673 bool space;
674 {
675 HDR *h, *srch, *last = NULL;
676
677 /* allocate space for new header */
678 h = allocheader(field, value, flags, e->e_rpool, space);
679
680 /* find insertion position */
681 for (srch = e->e_header; srch != NULL && idx > 0;
682 srch = srch->h_link, idx--)
683 last = srch;
684
685 if (e->e_header == NULL)
686 {
687 e->e_header = h;
688 h->h_link = NULL;
689 }
690 else if (srch == NULL)
691 {
692 SM_ASSERT(last != NULL);
693 last->h_link = h;
694 h->h_link = NULL;
695 }
696 else
697 {
698 h->h_link = srch->h_link;
699 srch->h_link = h;
700 }
701 }
702
703 /*
704 ** HVALUE -- return value of a header.
705 **
706 ** Only "real" fields (i.e., ones that have not been supplied
707 ** as a default) are used.
708 **
709 ** Parameters:
710 ** field -- the field name.
711 ** header -- the header list.
712 **
713 ** Returns:
714 ** pointer to the value part (internal format).
715 ** NULL if not found.
716 **
717 ** Side Effects:
718 ** none.
719 */
720
721 char *
hvalue(field,header)722 hvalue(field, header)
723 char *field;
724 HDR *header;
725 {
726 register HDR *h;
727
728 for (h = header; h != NULL; h = h->h_link)
729 {
730 if (!bitset(H_DEFAULT, h->h_flags) &&
731 sm_strcasecmp(h->h_field, field) == 0)
732 {
733 char *s;
734
735 s = h->h_value;
736 if (s == NULL)
737 return NULL;
738 while (isascii(*s) && isspace(*s))
739 s++;
740 return s;
741 }
742 }
743 return NULL;
744 }
745
746 /*
747 ** ISHEADER -- predicate telling if argument is a header.
748 **
749 ** A line is a header if it has a single word followed by
750 ** optional white space followed by a colon.
751 **
752 ** Header fields beginning with two dashes, although technically
753 ** permitted by RFC822, are automatically rejected in order
754 ** to make MIME work out. Without this we could have a technically
755 ** legal header such as ``--"foo:bar"'' that would also be a legal
756 ** MIME separator.
757 **
758 ** Parameters:
759 ** h -- string to check for possible headerness.
760 **
761 ** Returns:
762 ** true if h is a header.
763 ** false otherwise.
764 **
765 ** Side Effects:
766 ** none.
767 */
768
769 bool
isheader(h)770 isheader(h)
771 char *h;
772 {
773 char *s;
774
775 s = h;
776 if (s[0] == '-' && s[1] == '-')
777 return false;
778
779 while (*s > ' ' && *s != ':' && *s != '\0')
780 s++;
781
782 if (h == s)
783 return false;
784
785 /* following technically violates RFC822 */
786 while (isascii(*s) && isspace(*s))
787 s++;
788
789 return (*s == ':');
790 }
791
792 /*
793 ** EATHEADER -- run through the stored header and extract info.
794 **
795 ** Parameters:
796 ** e -- the envelope to process.
797 ** full -- if set, do full processing (e.g., compute
798 ** message priority). This should not be set
799 ** when reading a queue file because some info
800 ** needed to compute the priority is wrong.
801 ** log -- call logsender()?
802 **
803 ** Returns:
804 ** none.
805 **
806 ** Side Effects:
807 ** Sets a bunch of global variables from information
808 ** in the collected header.
809 */
810
811 void
eatheader(e,full,log)812 eatheader(e, full, log)
813 register ENVELOPE *e;
814 bool full;
815 bool log;
816 {
817 register HDR *h;
818 register char *p;
819 int hopcnt = 0;
820 char buf[MAXLINE];
821
822 /*
823 ** Set up macros for possible expansion in headers.
824 */
825
826 macdefine(&e->e_macro, A_PERM, 'f', e->e_sender);
827 macdefine(&e->e_macro, A_PERM, 'g', e->e_sender);
828 if (e->e_origrcpt != NULL && *e->e_origrcpt != '\0')
829 macdefine(&e->e_macro, A_PERM, 'u', e->e_origrcpt);
830 else
831 macdefine(&e->e_macro, A_PERM, 'u', NULL);
832
833 /* full name of from person */
834 p = hvalue("full-name", e->e_header);
835 if (p != NULL)
836 {
837 if (!rfc822_string(p))
838 {
839 /*
840 ** Quote a full name with special characters
841 ** as a comment so crackaddr() doesn't destroy
842 ** the name portion of the address.
843 */
844
845 p = addquotes(p, e->e_rpool);
846 }
847 macdefine(&e->e_macro, A_PERM, 'x', p);
848 }
849
850 if (tTd(32, 1))
851 sm_dprintf("----- collected header -----\n");
852 e->e_msgid = NULL;
853 for (h = e->e_header; h != NULL; h = h->h_link)
854 {
855 if (tTd(32, 1))
856 sm_dprintf("%s:", h->h_field);
857 if (h->h_value == NULL)
858 {
859 if (tTd(32, 1))
860 sm_dprintf("<NULL>\n");
861 continue;
862 }
863
864 /* do early binding */
865 if (bitset(H_DEFAULT, h->h_flags) &&
866 !bitset(H_BINDLATE, h->h_flags))
867 {
868 if (tTd(32, 1))
869 {
870 sm_dprintf("(");
871 xputs(sm_debug_file(), h->h_value);
872 sm_dprintf(") ");
873 }
874 expand(h->h_value, buf, sizeof(buf), e);
875 if (buf[0] != '\0' &&
876 (buf[0] != ' ' || buf[1] != '\0'))
877 {
878 if (bitset(H_FROM, h->h_flags))
879 expand(crackaddr(buf, e),
880 buf, sizeof(buf), e);
881 h->h_value = sm_rpool_strdup_x(e->e_rpool, buf);
882 h->h_flags &= ~H_DEFAULT;
883 }
884 }
885 if (tTd(32, 1))
886 {
887 xputs(sm_debug_file(), h->h_value);
888 sm_dprintf("\n");
889 }
890
891 /* count the number of times it has been processed */
892 if (bitset(H_TRACE, h->h_flags))
893 hopcnt++;
894
895 /* send to this person if we so desire */
896 if (GrabTo && bitset(H_RCPT, h->h_flags) &&
897 !bitset(H_DEFAULT, h->h_flags) &&
898 (!bitset(EF_RESENT, e->e_flags) ||
899 bitset(H_RESENT, h->h_flags)))
900 {
901 #if 0
902 int saveflags = e->e_flags;
903 #endif /* 0 */
904
905 (void) sendtolist(denlstring(h->h_value, true, false),
906 NULLADDR, &e->e_sendqueue, 0, e);
907
908 #if 0
909 /*
910 ** Change functionality so a fatal error on an
911 ** address doesn't affect the entire envelope.
912 */
913
914 /* delete fatal errors generated by this address */
915 if (!bitset(EF_FATALERRS, saveflags))
916 e->e_flags &= ~EF_FATALERRS;
917 #endif /* 0 */
918 }
919
920 /* save the message-id for logging */
921 p = "resent-message-id";
922 if (!bitset(EF_RESENT, e->e_flags))
923 p += 7;
924 if (sm_strcasecmp(h->h_field, p) == 0)
925 {
926 e->e_msgid = h->h_value;
927 while (isascii(*e->e_msgid) && isspace(*e->e_msgid))
928 e->e_msgid++;
929 macdefine(&e->e_macro, A_PERM, macid("{msg_id}"),
930 e->e_msgid);
931 }
932 }
933 if (tTd(32, 1))
934 sm_dprintf("----------------------------\n");
935
936 /* if we are just verifying (that is, sendmail -t -bv), drop out now */
937 if (OpMode == MD_VERIFY)
938 return;
939
940 /* store hop count */
941 if (hopcnt > e->e_hopcount)
942 {
943 e->e_hopcount = hopcnt;
944 (void) sm_snprintf(buf, sizeof(buf), "%d", e->e_hopcount);
945 macdefine(&e->e_macro, A_TEMP, 'c', buf);
946 }
947
948 /* message priority */
949 p = hvalue("precedence", e->e_header);
950 if (p != NULL)
951 e->e_class = priencode(p);
952 if (e->e_class < 0)
953 e->e_timeoutclass = TOC_NONURGENT;
954 else if (e->e_class > 0)
955 e->e_timeoutclass = TOC_URGENT;
956 if (full)
957 {
958 e->e_msgpriority = e->e_msgsize
959 - e->e_class * WkClassFact
960 + e->e_nrcpts * WkRecipFact;
961 }
962
963 /* check for DSN to properly set e_timeoutclass */
964 p = hvalue("content-type", e->e_header);
965 if (p != NULL)
966 {
967 bool oldsupr;
968 char **pvp;
969 char pvpbuf[MAXLINE];
970 extern unsigned char MimeTokenTab[256];
971
972 /* tokenize header */
973 oldsupr = SuprErrs;
974 SuprErrs = true;
975 pvp = prescan(p, '\0', pvpbuf, sizeof(pvpbuf), NULL,
976 MimeTokenTab, false);
977 SuprErrs = oldsupr;
978
979 /* Check if multipart/report */
980 if (pvp != NULL && pvp[0] != NULL &&
981 pvp[1] != NULL && pvp[2] != NULL &&
982 sm_strcasecmp(*pvp++, "multipart") == 0 &&
983 strcmp(*pvp++, "/") == 0 &&
984 sm_strcasecmp(*pvp++, "report") == 0)
985 {
986 /* Look for report-type=delivery-status */
987 while (*pvp != NULL)
988 {
989 /* skip to semicolon separator */
990 while (*pvp != NULL && strcmp(*pvp, ";") != 0)
991 pvp++;
992
993 /* skip semicolon */
994 if (*pvp++ == NULL || *pvp == NULL)
995 break;
996
997 /* look for report-type */
998 if (sm_strcasecmp(*pvp++, "report-type") != 0)
999 continue;
1000
1001 /* skip equal */
1002 if (*pvp == NULL || strcmp(*pvp, "=") != 0)
1003 continue;
1004
1005 /* check value */
1006 if (*++pvp != NULL &&
1007 sm_strcasecmp(*pvp,
1008 "delivery-status") == 0)
1009 e->e_timeoutclass = TOC_DSN;
1010
1011 /* found report-type, no need to continue */
1012 break;
1013 }
1014 }
1015 }
1016
1017 /* message timeout priority */
1018 p = hvalue("priority", e->e_header);
1019 if (p != NULL)
1020 {
1021 /* (this should be in the configuration file) */
1022 if (sm_strcasecmp(p, "urgent") == 0)
1023 e->e_timeoutclass = TOC_URGENT;
1024 else if (sm_strcasecmp(p, "normal") == 0)
1025 e->e_timeoutclass = TOC_NORMAL;
1026 else if (sm_strcasecmp(p, "non-urgent") == 0)
1027 e->e_timeoutclass = TOC_NONURGENT;
1028 else if (bitset(EF_RESPONSE, e->e_flags))
1029 e->e_timeoutclass = TOC_DSN;
1030 }
1031 else if (bitset(EF_RESPONSE, e->e_flags))
1032 e->e_timeoutclass = TOC_DSN;
1033
1034 /* date message originated */
1035 p = hvalue("posted-date", e->e_header);
1036 if (p == NULL)
1037 p = hvalue("date", e->e_header);
1038 if (p != NULL)
1039 macdefine(&e->e_macro, A_PERM, 'a', p);
1040
1041 /* check to see if this is a MIME message */
1042 if ((e->e_bodytype != NULL &&
1043 sm_strcasecmp(e->e_bodytype, "8BITMIME") == 0) ||
1044 hvalue("MIME-Version", e->e_header) != NULL)
1045 {
1046 e->e_flags |= EF_IS_MIME;
1047 if (HasEightBits)
1048 e->e_bodytype = "8BITMIME";
1049 }
1050 else if ((p = hvalue("Content-Type", e->e_header)) != NULL)
1051 {
1052 /* this may be an RFC 1049 message */
1053 p = strpbrk(p, ";/");
1054 if (p == NULL || *p == ';')
1055 {
1056 /* yep, it is */
1057 e->e_flags |= EF_DONT_MIME;
1058 }
1059 }
1060
1061 /*
1062 ** From person in antiquated ARPANET mode
1063 ** required by UK Grey Book e-mail gateways (sigh)
1064 */
1065
1066 if (OpMode == MD_ARPAFTP)
1067 {
1068 register struct hdrinfo *hi;
1069
1070 for (hi = HdrInfo; hi->hi_field != NULL; hi++)
1071 {
1072 if (bitset(H_FROM, hi->hi_flags) &&
1073 (!bitset(H_RESENT, hi->hi_flags) ||
1074 bitset(EF_RESENT, e->e_flags)) &&
1075 (p = hvalue(hi->hi_field, e->e_header)) != NULL)
1076 break;
1077 }
1078 if (hi->hi_field != NULL)
1079 {
1080 if (tTd(32, 2))
1081 sm_dprintf("eatheader: setsender(*%s == %s)\n",
1082 hi->hi_field, p);
1083 setsender(p, e, NULL, '\0', true);
1084 }
1085 }
1086
1087 /*
1088 ** Log collection information.
1089 */
1090
1091 if (tTd(92, 2))
1092 sm_dprintf("eatheader: e_id=%s, EF_LOGSENDER=%d, LogLevel=%d, log=%d\n",
1093 e->e_id, bitset(EF_LOGSENDER, e->e_flags), LogLevel,
1094 log);
1095 if (log && bitset(EF_LOGSENDER, e->e_flags) && LogLevel > 4)
1096 {
1097 logsender(e, e->e_msgid);
1098 e->e_flags &= ~EF_LOGSENDER;
1099 }
1100 }
1101
1102 /*
1103 ** LOGSENDER -- log sender information
1104 **
1105 ** Parameters:
1106 ** e -- the envelope to log
1107 ** msgid -- the message id
1108 **
1109 ** Returns:
1110 ** none
1111 */
1112
1113 void
logsender(e,msgid)1114 logsender(e, msgid)
1115 register ENVELOPE *e;
1116 char *msgid;
1117 {
1118 char *name;
1119 register char *sbp;
1120 register char *p;
1121 char hbuf[MAXNAME + 1];
1122 char sbuf[MAXLINE + 1];
1123 char mbuf[MAXNAME + 1];
1124
1125 /* don't allow newlines in the message-id */
1126 /* XXX do we still need this? sm_syslog() replaces control chars */
1127 if (msgid != NULL)
1128 {
1129 size_t l;
1130
1131 l = strlen(msgid);
1132 if (l > sizeof(mbuf) - 1)
1133 l = sizeof(mbuf) - 1;
1134 memmove(mbuf, msgid, l);
1135 mbuf[l] = '\0';
1136 p = mbuf;
1137 while ((p = strchr(p, '\n')) != NULL)
1138 *p++ = ' ';
1139 }
1140
1141 if (bitset(EF_RESPONSE, e->e_flags))
1142 name = "[RESPONSE]";
1143 else if ((name = macvalue('_', e)) != NULL)
1144 /* EMPTY */
1145 ;
1146 else if (RealHostName == NULL)
1147 name = "localhost";
1148 else if (RealHostName[0] == '[')
1149 name = RealHostName;
1150 else
1151 {
1152 name = hbuf;
1153 (void) sm_snprintf(hbuf, sizeof(hbuf), "%.80s", RealHostName);
1154 if (RealHostAddr.sa.sa_family != 0)
1155 {
1156 p = &hbuf[strlen(hbuf)];
1157 (void) sm_snprintf(p, SPACELEFT(hbuf, p),
1158 " (%.100s)",
1159 anynet_ntoa(&RealHostAddr));
1160 }
1161 }
1162
1163 /* some versions of syslog only take 5 printf args */
1164 #if (SYSLOG_BUFSIZE) >= 256
1165 sbp = sbuf;
1166 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1167 "from=%.200s, size=%ld, class=%d, nrcpts=%d",
1168 e->e_from.q_paddr == NULL ? "<NONE>" : e->e_from.q_paddr,
1169 PRT_NONNEGL(e->e_msgsize), e->e_class, e->e_nrcpts);
1170 sbp += strlen(sbp);
1171 if (msgid != NULL)
1172 {
1173 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1174 ", msgid=%.100s", mbuf);
1175 sbp += strlen(sbp);
1176 }
1177 if (e->e_bodytype != NULL)
1178 {
1179 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1180 ", bodytype=%.20s", e->e_bodytype);
1181 sbp += strlen(sbp);
1182 }
1183 p = macvalue('r', e);
1184 if (p != NULL)
1185 {
1186 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1187 ", proto=%.20s", p);
1188 sbp += strlen(sbp);
1189 }
1190 p = macvalue(macid("{daemon_name}"), e);
1191 if (p != NULL)
1192 {
1193 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1194 ", daemon=%.20s", p);
1195 sbp += strlen(sbp);
1196 }
1197 # if _FFR_LOG_MORE1
1198 # if STARTTLS
1199 p = macvalue(macid("{verify}"), e);
1200 if (p == NULL || *p == '\0')
1201 p = "NONE";
1202 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp), ", tls_verify=%.20s", p);
1203 sbp += strlen(sbp);
1204 # endif /* STARTTLS */
1205 # if SASL
1206 p = macvalue(macid("{auth_type}"), e);
1207 if (p == NULL || *p == '\0')
1208 p = "NONE";
1209 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp), ", auth=%.20s", p);
1210 sbp += strlen(sbp);
1211 # endif /* SASL */
1212 # endif /* _FFR_LOG_MORE1 */
1213 sm_syslog(LOG_INFO, e->e_id, "%.850s, relay=%s", sbuf, name);
1214
1215 #else /* (SYSLOG_BUFSIZE) >= 256 */
1216
1217 sm_syslog(LOG_INFO, e->e_id,
1218 "from=%s",
1219 e->e_from.q_paddr == NULL ? "<NONE>"
1220 : shortenstring(e->e_from.q_paddr,
1221 83));
1222 sm_syslog(LOG_INFO, e->e_id,
1223 "size=%ld, class=%ld, nrcpts=%d",
1224 PRT_NONNEGL(e->e_msgsize), e->e_class, e->e_nrcpts);
1225 if (msgid != NULL)
1226 sm_syslog(LOG_INFO, e->e_id,
1227 "msgid=%s",
1228 shortenstring(mbuf, 83));
1229 sbp = sbuf;
1230 *sbp = '\0';
1231 if (e->e_bodytype != NULL)
1232 {
1233 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1234 "bodytype=%.20s, ", e->e_bodytype);
1235 sbp += strlen(sbp);
1236 }
1237 p = macvalue('r', e);
1238 if (p != NULL)
1239 {
1240 (void) sm_snprintf(sbp, SPACELEFT(sbuf, sbp),
1241 "proto=%.20s, ", p);
1242 sbp += strlen(sbp);
1243 }
1244 sm_syslog(LOG_INFO, e->e_id,
1245 "%.400srelay=%s", sbuf, name);
1246 #endif /* (SYSLOG_BUFSIZE) >= 256 */
1247 }
1248
1249 /*
1250 ** PRIENCODE -- encode external priority names into internal values.
1251 **
1252 ** Parameters:
1253 ** p -- priority in ascii.
1254 **
1255 ** Returns:
1256 ** priority as a numeric level.
1257 **
1258 ** Side Effects:
1259 ** none.
1260 */
1261
1262 static int
priencode(p)1263 priencode(p)
1264 char *p;
1265 {
1266 register int i;
1267
1268 for (i = 0; i < NumPriorities; i++)
1269 {
1270 if (sm_strcasecmp(p, Priorities[i].pri_name) == 0)
1271 return Priorities[i].pri_val;
1272 }
1273
1274 /* unknown priority */
1275 return 0;
1276 }
1277
1278 /*
1279 ** CRACKADDR -- parse an address and turn it into a macro
1280 **
1281 ** This doesn't actually parse the address -- it just extracts
1282 ** it and replaces it with "$g". The parse is totally ad hoc
1283 ** and isn't even guaranteed to leave something syntactically
1284 ** identical to what it started with. However, it does leave
1285 ** something semantically identical if possible, else at least
1286 ** syntactically correct.
1287 **
1288 ** For example, it changes "Real Name <[email protected]> (Comment)"
1289 ** to "Real Name <$g> (Comment)".
1290 **
1291 ** This algorithm has been cleaned up to handle a wider range
1292 ** of cases -- notably quoted and backslash escaped strings.
1293 ** This modification makes it substantially better at preserving
1294 ** the original syntax.
1295 **
1296 ** Parameters:
1297 ** addr -- the address to be cracked.
1298 ** e -- the current envelope.
1299 **
1300 ** Returns:
1301 ** a pointer to the new version.
1302 **
1303 ** Side Effects:
1304 ** none.
1305 **
1306 ** Warning:
1307 ** The return value is saved in local storage and should
1308 ** be copied if it is to be reused.
1309 */
1310
1311 #define SM_HAVE_ROOM ((bp < buflim) && (buflim <= bufend))
1312
1313 /*
1314 ** Append a character to bp if we have room.
1315 ** If not, punt and return $g.
1316 */
1317
1318 #define SM_APPEND_CHAR(c) \
1319 do \
1320 { \
1321 if (SM_HAVE_ROOM) \
1322 *bp++ = (c); \
1323 else \
1324 goto returng; \
1325 } while (0)
1326
1327 #if MAXNAME < 10
1328 ERROR MAXNAME must be at least 10
1329 #endif /* MAXNAME < 10 */
1330
1331 char *
crackaddr(addr,e)1332 crackaddr(addr, e)
1333 register char *addr;
1334 ENVELOPE *e;
1335 {
1336 register char *p;
1337 register char c;
1338 int cmtlev; /* comment level in input string */
1339 int realcmtlev; /* comment level in output string */
1340 int anglelev; /* angle level in input string */
1341 int copylev; /* 0 == in address, >0 copying */
1342 int bracklev; /* bracket level for IPv6 addr check */
1343 bool addangle; /* put closing angle in output */
1344 bool qmode; /* quoting in original string? */
1345 bool realqmode; /* quoting in output string? */
1346 bool putgmac = false; /* already wrote $g */
1347 bool quoteit = false; /* need to quote next character */
1348 bool gotangle = false; /* found first '<' */
1349 bool gotcolon = false; /* found a ':' */
1350 register char *bp;
1351 char *buflim;
1352 char *bufhead;
1353 char *addrhead;
1354 char *bufend;
1355 static char buf[MAXNAME + 1];
1356
1357 if (tTd(33, 1))
1358 sm_dprintf("crackaddr(%s)\n", addr);
1359
1360 buflim = bufend = &buf[sizeof(buf) - 1];
1361 bp = bufhead = buf;
1362
1363 /* skip over leading spaces but preserve them */
1364 while (*addr != '\0' && isascii(*addr) && isspace(*addr))
1365 {
1366 SM_APPEND_CHAR(*addr);
1367 addr++;
1368 }
1369 bufhead = bp;
1370
1371 /*
1372 ** Start by assuming we have no angle brackets. This will be
1373 ** adjusted later if we find them.
1374 */
1375
1376 p = addrhead = addr;
1377 copylev = anglelev = cmtlev = realcmtlev = 0;
1378 bracklev = 0;
1379 qmode = realqmode = addangle = false;
1380
1381 while ((c = *p++) != '\0')
1382 {
1383 /*
1384 ** Try to keep legal syntax using spare buffer space
1385 ** (maintained by buflim).
1386 */
1387
1388 if (copylev > 0)
1389 SM_APPEND_CHAR(c);
1390
1391 /* check for backslash escapes */
1392 if (c == '\\')
1393 {
1394 /* arrange to quote the address */
1395 if (cmtlev <= 0 && !qmode)
1396 quoteit = true;
1397
1398 if ((c = *p++) == '\0')
1399 {
1400 /* too far */
1401 p--;
1402 goto putg;
1403 }
1404 if (copylev > 0)
1405 SM_APPEND_CHAR(c);
1406 goto putg;
1407 }
1408
1409 /* check for quoted strings */
1410 if (c == '"' && cmtlev <= 0)
1411 {
1412 qmode = !qmode;
1413 if (copylev > 0 && SM_HAVE_ROOM)
1414 {
1415 if (realqmode)
1416 buflim--;
1417 else
1418 buflim++;
1419 realqmode = !realqmode;
1420 }
1421 continue;
1422 }
1423 if (qmode)
1424 goto putg;
1425
1426 /* check for comments */
1427 if (c == '(')
1428 {
1429 cmtlev++;
1430
1431 /* allow space for closing paren */
1432 if (SM_HAVE_ROOM)
1433 {
1434 buflim--;
1435 realcmtlev++;
1436 if (copylev++ <= 0)
1437 {
1438 if (bp != bufhead)
1439 SM_APPEND_CHAR(' ');
1440 SM_APPEND_CHAR(c);
1441 }
1442 }
1443 }
1444 if (cmtlev > 0)
1445 {
1446 if (c == ')')
1447 {
1448 cmtlev--;
1449 copylev--;
1450 if (SM_HAVE_ROOM)
1451 {
1452 realcmtlev--;
1453 buflim++;
1454 }
1455 }
1456 continue;
1457 }
1458 else if (c == ')')
1459 {
1460 /* syntax error: unmatched ) */
1461 if (copylev > 0 && SM_HAVE_ROOM && bp > bufhead)
1462 bp--;
1463 }
1464
1465 /* count nesting on [ ... ] (for IPv6 domain literals) */
1466 if (c == '[')
1467 bracklev++;
1468 else if (c == ']')
1469 bracklev--;
1470
1471 /* check for group: list; syntax */
1472 if (c == ':' && anglelev <= 0 && bracklev <= 0 &&
1473 !gotcolon && !ColonOkInAddr)
1474 {
1475 register char *q;
1476
1477 /*
1478 ** Check for DECnet phase IV ``::'' (host::user)
1479 ** or DECnet phase V ``:.'' syntaxes. The latter
1480 ** covers ``user@DEC:.tay.myhost'' and
1481 ** ``DEC:.tay.myhost::user'' syntaxes (bletch).
1482 */
1483
1484 if (*p == ':' || *p == '.')
1485 {
1486 if (cmtlev <= 0 && !qmode)
1487 quoteit = true;
1488 if (copylev > 0)
1489 {
1490 SM_APPEND_CHAR(c);
1491 SM_APPEND_CHAR(*p);
1492 }
1493 p++;
1494 goto putg;
1495 }
1496
1497 gotcolon = true;
1498
1499 bp = bufhead;
1500 if (quoteit)
1501 {
1502 SM_APPEND_CHAR('"');
1503
1504 /* back up over the ':' and any spaces */
1505 --p;
1506 while (p > addr &&
1507 isascii(*--p) && isspace(*p))
1508 continue;
1509 p++;
1510 }
1511 for (q = addrhead; q < p; )
1512 {
1513 c = *q++;
1514 if (quoteit && c == '"')
1515 SM_APPEND_CHAR('\\');
1516 SM_APPEND_CHAR(c);
1517 }
1518 if (quoteit)
1519 {
1520 if (bp == &bufhead[1])
1521 bp--;
1522 else
1523 SM_APPEND_CHAR('"');
1524 while ((c = *p++) != ':')
1525 SM_APPEND_CHAR(c);
1526 SM_APPEND_CHAR(c);
1527 }
1528
1529 /* any trailing white space is part of group: */
1530 while (isascii(*p) && isspace(*p))
1531 {
1532 SM_APPEND_CHAR(*p);
1533 p++;
1534 }
1535 copylev = 0;
1536 putgmac = quoteit = false;
1537 bufhead = bp;
1538 addrhead = p;
1539 continue;
1540 }
1541
1542 if (c == ';' && copylev <= 0 && !ColonOkInAddr)
1543 SM_APPEND_CHAR(c);
1544
1545 /* check for characters that may have to be quoted */
1546 if (strchr(MustQuoteChars, c) != NULL)
1547 {
1548 /*
1549 ** If these occur as the phrase part of a <>
1550 ** construct, but are not inside of () or already
1551 ** quoted, they will have to be quoted. Note that
1552 ** now (but don't actually do the quoting).
1553 */
1554
1555 if (cmtlev <= 0 && !qmode)
1556 quoteit = true;
1557 }
1558
1559 /* check for angle brackets */
1560 if (c == '<')
1561 {
1562 register char *q;
1563
1564 /* assume first of two angles is bogus */
1565 if (gotangle)
1566 quoteit = true;
1567 gotangle = true;
1568
1569 /* oops -- have to change our mind */
1570 anglelev = 1;
1571 if (SM_HAVE_ROOM)
1572 {
1573 if (!addangle)
1574 buflim--;
1575 addangle = true;
1576 }
1577
1578 bp = bufhead;
1579 if (quoteit)
1580 {
1581 SM_APPEND_CHAR('"');
1582
1583 /* back up over the '<' and any spaces */
1584 --p;
1585 while (p > addr &&
1586 isascii(*--p) && isspace(*p))
1587 continue;
1588 p++;
1589 }
1590 for (q = addrhead; q < p; )
1591 {
1592 c = *q++;
1593 if (quoteit && c == '"')
1594 {
1595 SM_APPEND_CHAR('\\');
1596 SM_APPEND_CHAR(c);
1597 }
1598 else
1599 SM_APPEND_CHAR(c);
1600 }
1601 if (quoteit)
1602 {
1603 if (bp == &buf[1])
1604 bp--;
1605 else
1606 SM_APPEND_CHAR('"');
1607 while ((c = *p++) != '<')
1608 SM_APPEND_CHAR(c);
1609 SM_APPEND_CHAR(c);
1610 }
1611 copylev = 0;
1612 putgmac = quoteit = false;
1613 continue;
1614 }
1615
1616 if (c == '>')
1617 {
1618 if (anglelev > 0)
1619 {
1620 anglelev--;
1621 if (SM_HAVE_ROOM)
1622 {
1623 if (addangle)
1624 buflim++;
1625 addangle = false;
1626 }
1627 }
1628 else if (SM_HAVE_ROOM)
1629 {
1630 /* syntax error: unmatched > */
1631 if (copylev > 0 && bp > bufhead)
1632 bp--;
1633 quoteit = true;
1634 continue;
1635 }
1636 if (copylev++ <= 0)
1637 SM_APPEND_CHAR(c);
1638 continue;
1639 }
1640
1641 /* must be a real address character */
1642 putg:
1643 if (copylev <= 0 && !putgmac)
1644 {
1645 if (bp > buf && bp[-1] == ')')
1646 SM_APPEND_CHAR(' ');
1647 SM_APPEND_CHAR(MACROEXPAND);
1648 SM_APPEND_CHAR('g');
1649 putgmac = true;
1650 }
1651 }
1652
1653 /* repair any syntactic damage */
1654 if (realqmode && bp < bufend)
1655 *bp++ = '"';
1656 while (realcmtlev-- > 0 && bp < bufend)
1657 *bp++ = ')';
1658 if (addangle && bp < bufend)
1659 *bp++ = '>';
1660 *bp = '\0';
1661 if (bp < bufend)
1662 goto success;
1663
1664 returng:
1665 /* String too long, punt */
1666 buf[0] = '<';
1667 buf[1] = MACROEXPAND;
1668 buf[2]= 'g';
1669 buf[3] = '>';
1670 buf[4]= '\0';
1671 sm_syslog(LOG_ALERT, e->e_id,
1672 "Dropped invalid comments from header address");
1673
1674 success:
1675 if (tTd(33, 1))
1676 {
1677 sm_dprintf("crackaddr=>`");
1678 xputs(sm_debug_file(), buf);
1679 sm_dprintf("'\n");
1680 }
1681 return buf;
1682 }
1683
1684 /*
1685 ** PUTHEADER -- put the header part of a message from the in-core copy
1686 **
1687 ** Parameters:
1688 ** mci -- the connection information.
1689 ** hdr -- the header to put.
1690 ** e -- envelope to use.
1691 ** flags -- MIME conversion flags.
1692 **
1693 ** Returns:
1694 ** true iff header part was written successfully
1695 **
1696 ** Side Effects:
1697 ** none.
1698 */
1699
1700 bool
putheader(mci,hdr,e,flags)1701 putheader(mci, hdr, e, flags)
1702 register MCI *mci;
1703 HDR *hdr;
1704 register ENVELOPE *e;
1705 int flags;
1706 {
1707 register HDR *h;
1708 char buf[SM_MAX(MAXLINE,BUFSIZ)];
1709 char obuf[MAXLINE];
1710
1711 if (tTd(34, 1))
1712 sm_dprintf("--- putheader, mailer = %s ---\n",
1713 mci->mci_mailer->m_name);
1714
1715 /*
1716 ** If we're in MIME mode, we're not really in the header of the
1717 ** message, just the header of one of the parts of the body of
1718 ** the message. Therefore MCIF_INHEADER should not be turned on.
1719 */
1720
1721 if (!bitset(MCIF_INMIME, mci->mci_flags))
1722 mci->mci_flags |= MCIF_INHEADER;
1723
1724 for (h = hdr; h != NULL; h = h->h_link)
1725 {
1726 register char *p = h->h_value;
1727 char *q;
1728
1729 if (tTd(34, 11))
1730 {
1731 sm_dprintf(" %s:", h->h_field);
1732 xputs(sm_debug_file(), p);
1733 }
1734
1735 /* Skip empty headers */
1736 if (h->h_value == NULL)
1737 continue;
1738
1739 /* heuristic shortening of MIME fields to avoid MUA overflows */
1740 if (MaxMimeFieldLength > 0 &&
1741 wordinclass(h->h_field,
1742 macid("{checkMIMEFieldHeaders}")))
1743 {
1744 size_t len;
1745
1746 len = fix_mime_header(h, e);
1747 if (len > 0)
1748 {
1749 sm_syslog(LOG_ALERT, e->e_id,
1750 "Truncated MIME %s header due to field size (length = %ld) (possible attack)",
1751 h->h_field, (unsigned long) len);
1752 if (tTd(34, 11))
1753 sm_dprintf(" truncated MIME %s header due to field size (length = %ld) (possible attack)\n",
1754 h->h_field,
1755 (unsigned long) len);
1756 }
1757 }
1758
1759 if (MaxMimeHeaderLength > 0 &&
1760 wordinclass(h->h_field,
1761 macid("{checkMIMETextHeaders}")))
1762 {
1763 size_t len;
1764
1765 len = strlen(h->h_value);
1766 if (len > (size_t) MaxMimeHeaderLength)
1767 {
1768 h->h_value[MaxMimeHeaderLength - 1] = '\0';
1769 sm_syslog(LOG_ALERT, e->e_id,
1770 "Truncated long MIME %s header (length = %ld) (possible attack)",
1771 h->h_field, (unsigned long) len);
1772 if (tTd(34, 11))
1773 sm_dprintf(" truncated long MIME %s header (length = %ld) (possible attack)\n",
1774 h->h_field,
1775 (unsigned long) len);
1776 }
1777 }
1778
1779 if (MaxMimeHeaderLength > 0 &&
1780 wordinclass(h->h_field,
1781 macid("{checkMIMEHeaders}")))
1782 {
1783 size_t len;
1784
1785 len = strlen(h->h_value);
1786 if (shorten_rfc822_string(h->h_value,
1787 MaxMimeHeaderLength))
1788 {
1789 if (len < MaxMimeHeaderLength)
1790 {
1791 /* we only rebalanced a bogus header */
1792 sm_syslog(LOG_ALERT, e->e_id,
1793 "Fixed MIME %s header (possible attack)",
1794 h->h_field);
1795 if (tTd(34, 11))
1796 sm_dprintf(" fixed MIME %s header (possible attack)\n",
1797 h->h_field);
1798 }
1799 else
1800 {
1801 /* we actually shortened header */
1802 sm_syslog(LOG_ALERT, e->e_id,
1803 "Truncated long MIME %s header (length = %ld) (possible attack)",
1804 h->h_field,
1805 (unsigned long) len);
1806 if (tTd(34, 11))
1807 sm_dprintf(" truncated long MIME %s header (length = %ld) (possible attack)\n",
1808 h->h_field,
1809 (unsigned long) len);
1810 }
1811 }
1812 }
1813
1814 /*
1815 ** Suppress Content-Transfer-Encoding: if we are MIMEing
1816 ** and we are potentially converting from 8 bit to 7 bit
1817 ** MIME. If converting, add a new CTE header in
1818 ** mime8to7().
1819 */
1820
1821 if (bitset(H_CTE, h->h_flags) &&
1822 bitset(MCIF_CVT8TO7|MCIF_CVT7TO8|MCIF_INMIME,
1823 mci->mci_flags) &&
1824 !bitset(M87F_NO8TO7, flags))
1825 {
1826 if (tTd(34, 11))
1827 sm_dprintf(" (skipped (content-transfer-encoding))\n");
1828 continue;
1829 }
1830
1831 if (bitset(MCIF_INMIME, mci->mci_flags))
1832 {
1833 if (tTd(34, 11))
1834 sm_dprintf("\n");
1835 if (!put_vanilla_header(h, p, mci))
1836 goto writeerr;
1837 continue;
1838 }
1839
1840 if (bitset(H_CHECK|H_ACHECK, h->h_flags) &&
1841 !bitintersect(h->h_mflags, mci->mci_mailer->m_flags) &&
1842 (h->h_macro == '\0' ||
1843 (q = macvalue(bitidx(h->h_macro), e)) == NULL ||
1844 *q == '\0'))
1845 {
1846 if (tTd(34, 11))
1847 sm_dprintf(" (skipped)\n");
1848 continue;
1849 }
1850
1851 /* handle Resent-... headers specially */
1852 if (bitset(H_RESENT, h->h_flags) && !bitset(EF_RESENT, e->e_flags))
1853 {
1854 if (tTd(34, 11))
1855 sm_dprintf(" (skipped (resent))\n");
1856 continue;
1857 }
1858
1859 /* suppress return receipts if requested */
1860 if (bitset(H_RECEIPTTO, h->h_flags) &&
1861 (RrtImpliesDsn || bitset(EF_NORECEIPT, e->e_flags)))
1862 {
1863 if (tTd(34, 11))
1864 sm_dprintf(" (skipped (receipt))\n");
1865 continue;
1866 }
1867
1868 /* macro expand value if generated internally */
1869 if (bitset(H_DEFAULT, h->h_flags) ||
1870 bitset(H_BINDLATE, h->h_flags))
1871 {
1872 expand(p, buf, sizeof(buf), e);
1873 p = buf;
1874 if (*p == '\0')
1875 {
1876 if (tTd(34, 11))
1877 sm_dprintf(" (skipped -- null value)\n");
1878 continue;
1879 }
1880 }
1881
1882 if (bitset(H_BCC, h->h_flags))
1883 {
1884 /* Bcc: field -- either truncate or delete */
1885 if (bitset(EF_DELETE_BCC, e->e_flags))
1886 {
1887 if (tTd(34, 11))
1888 sm_dprintf(" (skipped -- bcc)\n");
1889 }
1890 else
1891 {
1892 /* no other recipient headers: truncate value */
1893 (void) sm_strlcpyn(obuf, sizeof(obuf), 2,
1894 h->h_field, ":");
1895 if (!putline(obuf, mci))
1896 goto writeerr;
1897 }
1898 continue;
1899 }
1900
1901 if (tTd(34, 11))
1902 sm_dprintf("\n");
1903
1904 if (bitset(H_FROM|H_RCPT, h->h_flags))
1905 {
1906 /* address field */
1907 bool oldstyle = bitset(EF_OLDSTYLE, e->e_flags);
1908
1909 if (bitset(H_FROM, h->h_flags))
1910 oldstyle = false;
1911 if (!commaize(h, p, oldstyle, mci, e,
1912 PXLF_HEADER | PXLF_STRIPMQUOTE)
1913 && bitnset(M_xSMTP, mci->mci_mailer->m_flags))
1914 goto writeerr;
1915 }
1916 else
1917 {
1918 if (!put_vanilla_header(h, p, mci))
1919 goto writeerr;
1920 }
1921 }
1922
1923 /*
1924 ** If we are converting this to a MIME message, add the
1925 ** MIME headers (but not in MIME mode!).
1926 */
1927
1928 #if MIME8TO7
1929 if (bitset(MM_MIME8BIT, MimeMode) &&
1930 bitset(EF_HAS8BIT, e->e_flags) &&
1931 !bitset(EF_DONT_MIME, e->e_flags) &&
1932 !bitnset(M_8BITS, mci->mci_mailer->m_flags) &&
1933 !bitset(MCIF_CVT8TO7|MCIF_CVT7TO8|MCIF_INMIME, mci->mci_flags) &&
1934 hvalue("MIME-Version", e->e_header) == NULL)
1935 {
1936 if (!putline("MIME-Version: 1.0", mci))
1937 goto writeerr;
1938 if (hvalue("Content-Type", e->e_header) == NULL)
1939 {
1940 (void) sm_snprintf(obuf, sizeof(obuf),
1941 "Content-Type: text/plain; charset=%s",
1942 defcharset(e));
1943 if (!putline(obuf, mci))
1944 goto writeerr;
1945 }
1946 if (hvalue("Content-Transfer-Encoding", e->e_header) == NULL
1947 && !putline("Content-Transfer-Encoding: 8bit", mci))
1948 goto writeerr;
1949 }
1950 #endif /* MIME8TO7 */
1951 return true;
1952
1953 writeerr:
1954 return false;
1955 }
1956
1957 /*
1958 ** PUT_VANILLA_HEADER -- output a fairly ordinary header
1959 **
1960 ** Parameters:
1961 ** h -- the structure describing this header
1962 ** v -- the value of this header
1963 ** mci -- the connection info for output
1964 **
1965 ** Returns:
1966 ** true iff header was written successfully
1967 */
1968
1969 static bool
put_vanilla_header(h,v,mci)1970 put_vanilla_header(h, v, mci)
1971 HDR *h;
1972 char *v;
1973 MCI *mci;
1974 {
1975 register char *nlp;
1976 register char *obp;
1977 int putflags;
1978 char obuf[MAXLINE + 256]; /* additional length for h_field */
1979
1980 putflags = PXLF_HEADER | PXLF_STRIPMQUOTE;
1981 if (bitnset(M_7BITHDRS, mci->mci_mailer->m_flags))
1982 putflags |= PXLF_STRIP8BIT;
1983 (void) sm_snprintf(obuf, sizeof(obuf), "%.200s:", h->h_field);
1984 obp = obuf + strlen(obuf);
1985 while ((nlp = strchr(v, '\n')) != NULL)
1986 {
1987 int l;
1988
1989 l = nlp - v;
1990
1991 /*
1992 ** XXX This is broken for SPACELEFT()==0
1993 ** However, SPACELEFT() is always > 0 unless MAXLINE==1.
1994 */
1995
1996 if (SPACELEFT(obuf, obp) - 1 < (size_t) l)
1997 l = SPACELEFT(obuf, obp) - 1;
1998
1999 (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%.*s", l, v);
2000 if (!putxline(obuf, strlen(obuf), mci, putflags))
2001 goto writeerr;
2002 v += l + 1;
2003 obp = obuf;
2004 if (*v != ' ' && *v != '\t')
2005 *obp++ = ' ';
2006 }
2007
2008 /* XXX This is broken for SPACELEFT()==0 */
2009 (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%.*s",
2010 (int) (SPACELEFT(obuf, obp) - 1), v);
2011 return putxline(obuf, strlen(obuf), mci, putflags);
2012
2013 writeerr:
2014 return false;
2015 }
2016
2017 /*
2018 ** COMMAIZE -- output a header field, making a comma-translated list.
2019 **
2020 ** Parameters:
2021 ** h -- the header field to output.
2022 ** p -- the value to put in it.
2023 ** oldstyle -- true if this is an old style header.
2024 ** mci -- the connection information.
2025 ** e -- the envelope containing the message.
2026 ** putflags -- flags for putxline()
2027 **
2028 ** Returns:
2029 ** true iff header field was written successfully
2030 **
2031 ** Side Effects:
2032 ** outputs "p" to "mci".
2033 */
2034
2035 bool
commaize(h,p,oldstyle,mci,e,putflags)2036 commaize(h, p, oldstyle, mci, e, putflags)
2037 register HDR *h;
2038 register char *p;
2039 bool oldstyle;
2040 register MCI *mci;
2041 register ENVELOPE *e;
2042 int putflags;
2043 {
2044 register char *obp;
2045 int opos, omax, spaces;
2046 bool firstone = true;
2047 char **res;
2048 char obuf[MAXLINE + 3];
2049
2050 /*
2051 ** Output the address list translated by the
2052 ** mailer and with commas.
2053 */
2054
2055 if (tTd(14, 2))
2056 sm_dprintf("commaize(%s:%s)\n", h->h_field, p);
2057
2058 if (bitnset(M_7BITHDRS, mci->mci_mailer->m_flags))
2059 putflags |= PXLF_STRIP8BIT;
2060
2061 obp = obuf;
2062 (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%.200s:", h->h_field);
2063 /* opos = strlen(obp); instead of the next 3 lines? */
2064 opos = strlen(h->h_field) + 1;
2065 if (opos > 201)
2066 opos = 201;
2067 obp += opos;
2068
2069 spaces = 0;
2070 while (*p != '\0' && isascii(*p) && isspace(*p))
2071 {
2072 ++spaces;
2073 ++p;
2074 }
2075 if (spaces > 0)
2076 {
2077 SM_ASSERT(sizeof(obuf) > opos * 2);
2078
2079 /*
2080 ** Restrict number of spaces to half the length of buffer
2081 ** so the header field body can be put in here too.
2082 ** Note: this is a hack...
2083 */
2084
2085 if (spaces > sizeof(obuf) / 2)
2086 spaces = sizeof(obuf) / 2;
2087 (void) sm_snprintf(obp, SPACELEFT(obuf, obp), "%*s", spaces,
2088 "");
2089 opos += spaces;
2090 obp += spaces;
2091 SM_ASSERT(obp < &obuf[MAXLINE]);
2092 }
2093
2094 omax = mci->mci_mailer->m_linelimit - 2;
2095 if (omax < 0 || omax > 78)
2096 omax = 78;
2097
2098 /*
2099 ** Run through the list of values.
2100 */
2101
2102 while (*p != '\0')
2103 {
2104 register char *name;
2105 register int c;
2106 char savechar;
2107 int flags;
2108 auto int status;
2109
2110 /*
2111 ** Find the end of the name. New style names
2112 ** end with a comma, old style names end with
2113 ** a space character. However, spaces do not
2114 ** necessarily delimit an old-style name -- at
2115 ** signs mean keep going.
2116 */
2117
2118 /* find end of name */
2119 while ((isascii(*p) && isspace(*p)) || *p == ',')
2120 p++;
2121 name = p;
2122 res = NULL;
2123 for (;;)
2124 {
2125 auto char *oldp;
2126 char pvpbuf[PSBUFSIZE];
2127
2128 res = prescan(p, oldstyle ? ' ' : ',', pvpbuf,
2129 sizeof(pvpbuf), &oldp, ExtTokenTab, false);
2130 p = oldp;
2131 #if _FFR_IGNORE_BOGUS_ADDR
2132 /* ignore addresses that can't be parsed */
2133 if (res == NULL)
2134 {
2135 name = p;
2136 continue;
2137 }
2138 #endif /* _FFR_IGNORE_BOGUS_ADDR */
2139
2140 /* look to see if we have an at sign */
2141 while (*p != '\0' && isascii(*p) && isspace(*p))
2142 p++;
2143
2144 if (*p != '@')
2145 {
2146 p = oldp;
2147 break;
2148 }
2149 ++p;
2150 while (*p != '\0' && isascii(*p) && isspace(*p))
2151 p++;
2152 }
2153 /* at the end of one complete name */
2154
2155 /* strip off trailing white space */
2156 while (p >= name &&
2157 ((isascii(*p) && isspace(*p)) || *p == ',' || *p == '\0'))
2158 p--;
2159 if (++p == name)
2160 continue;
2161
2162 /*
2163 ** if prescan() failed go a bit backwards; this is a hack,
2164 ** there should be some better error recovery.
2165 */
2166
2167 if (res == NULL && p > name &&
2168 !((isascii(*p) && isspace(*p)) || *p == ',' || *p == '\0'))
2169 --p;
2170 savechar = *p;
2171 *p = '\0';
2172
2173 /* translate the name to be relative */
2174 flags = RF_HEADERADDR|RF_ADDDOMAIN;
2175 if (bitset(H_FROM, h->h_flags))
2176 flags |= RF_SENDERADDR;
2177 #if USERDB
2178 else if (e->e_from.q_mailer != NULL &&
2179 bitnset(M_UDBRECIPIENT, e->e_from.q_mailer->m_flags))
2180 {
2181 char *q;
2182
2183 q = udbsender(name, e->e_rpool);
2184 if (q != NULL)
2185 name = q;
2186 }
2187 #endif /* USERDB */
2188 status = EX_OK;
2189 name = remotename(name, mci->mci_mailer, flags, &status, e);
2190 if (status != EX_OK && bitnset(M_xSMTP, mci->mci_mailer->m_flags))
2191 {
2192 if (status == EX_TEMPFAIL)
2193 mci->mci_flags |= MCIF_NOTSTICKY;
2194 goto writeerr;
2195 }
2196 if (*name == '\0')
2197 {
2198 *p = savechar;
2199 continue;
2200 }
2201 name = denlstring(name, false, true);
2202
2203 /* output the name with nice formatting */
2204 opos += strlen(name);
2205 if (!firstone)
2206 opos += 2;
2207 if (opos > omax && !firstone)
2208 {
2209 (void) sm_strlcpy(obp, ",\n", SPACELEFT(obuf, obp));
2210 if (!putxline(obuf, strlen(obuf), mci, putflags))
2211 goto writeerr;
2212 obp = obuf;
2213 (void) sm_strlcpy(obp, " ", sizeof(obuf));
2214 opos = strlen(obp);
2215 obp += opos;
2216 opos += strlen(name);
2217 }
2218 else if (!firstone)
2219 {
2220 (void) sm_strlcpy(obp, ", ", SPACELEFT(obuf, obp));
2221 obp += 2;
2222 }
2223
2224 while ((c = *name++) != '\0' && obp < &obuf[MAXLINE])
2225 *obp++ = c;
2226 firstone = false;
2227 *p = savechar;
2228 }
2229 if (obp < &obuf[sizeof(obuf)])
2230 *obp = '\0';
2231 else
2232 obuf[sizeof(obuf) - 1] = '\0';
2233 return putxline(obuf, strlen(obuf), mci, putflags);
2234
2235 writeerr:
2236 return false;
2237 }
2238
2239 /*
2240 ** COPYHEADER -- copy header list
2241 **
2242 ** This routine is the equivalent of newstr for header lists
2243 **
2244 ** Parameters:
2245 ** header -- list of header structures to copy.
2246 ** rpool -- resource pool, or NULL
2247 **
2248 ** Returns:
2249 ** a copy of 'header'.
2250 **
2251 ** Side Effects:
2252 ** none.
2253 */
2254
2255 HDR *
copyheader(header,rpool)2256 copyheader(header, rpool)
2257 register HDR *header;
2258 SM_RPOOL_T *rpool;
2259 {
2260 register HDR *newhdr;
2261 HDR *ret;
2262 register HDR **tail = &ret;
2263
2264 while (header != NULL)
2265 {
2266 newhdr = (HDR *) sm_rpool_malloc_x(rpool, sizeof(*newhdr));
2267 STRUCTCOPY(*header, *newhdr);
2268 *tail = newhdr;
2269 tail = &newhdr->h_link;
2270 header = header->h_link;
2271 }
2272 *tail = NULL;
2273
2274 return ret;
2275 }
2276
2277 /*
2278 ** FIX_MIME_HEADER -- possibly truncate/rebalance parameters in a MIME header
2279 **
2280 ** Run through all of the parameters of a MIME header and
2281 ** possibly truncate and rebalance the parameter according
2282 ** to MaxMimeFieldLength.
2283 **
2284 ** Parameters:
2285 ** h -- the header to truncate/rebalance
2286 ** e -- the current envelope
2287 **
2288 ** Returns:
2289 ** length of last offending field, 0 if all ok.
2290 **
2291 ** Side Effects:
2292 ** string modified in place
2293 */
2294
2295 static size_t
fix_mime_header(h,e)2296 fix_mime_header(h, e)
2297 HDR *h;
2298 ENVELOPE *e;
2299 {
2300 char *begin = h->h_value;
2301 char *end;
2302 size_t len = 0;
2303 size_t retlen = 0;
2304
2305 if (begin == NULL || *begin == '\0')
2306 return 0;
2307
2308 /* Split on each ';' */
2309 /* find_character() never returns NULL */
2310 while ((end = find_character(begin, ';')) != NULL)
2311 {
2312 char save = *end;
2313 char *bp;
2314
2315 *end = '\0';
2316
2317 len = strlen(begin);
2318
2319 /* Shorten individual parameter */
2320 if (shorten_rfc822_string(begin, MaxMimeFieldLength))
2321 {
2322 if (len < MaxMimeFieldLength)
2323 {
2324 /* we only rebalanced a bogus field */
2325 sm_syslog(LOG_ALERT, e->e_id,
2326 "Fixed MIME %s header field (possible attack)",
2327 h->h_field);
2328 if (tTd(34, 11))
2329 sm_dprintf(" fixed MIME %s header field (possible attack)\n",
2330 h->h_field);
2331 }
2332 else
2333 {
2334 /* we actually shortened the header */
2335 retlen = len;
2336 }
2337 }
2338
2339 /* Collapse the possibly shortened string with rest */
2340 bp = begin + strlen(begin);
2341 if (bp != end)
2342 {
2343 char *ep = end;
2344
2345 *end = save;
2346 end = bp;
2347
2348 /* copy character by character due to overlap */
2349 while (*ep != '\0')
2350 *bp++ = *ep++;
2351 *bp = '\0';
2352 }
2353 else
2354 *end = save;
2355 if (*end == '\0')
2356 break;
2357
2358 /* Move past ';' */
2359 begin = end + 1;
2360 }
2361 return retlen;
2362 }
2363