6d20a5cdae255ee68582545a7c3db1f974ec7203
[exim.git] / src / src / receive.c
1 /*************************************************
2 * Exim - an Internet mail transport agent *
3 *************************************************/
4
5 /* Copyright (c) University of Cambridge 1995 - 2018 */
6 /* See the file NOTICE for conditions of use and distribution. */
7
8 /* Code for receiving a message and setting up spool files. */
9
10 #include "exim.h"
11 #include <setjmp.h>
12
13 #ifdef EXPERIMENTAL_DCC
14 extern int dcc_ok;
15 #endif
16
17 #ifdef SUPPORT_DMARC
18 # include "dmarc.h"
19 #endif
20
21 /*************************************************
22 * Local static variables *
23 *************************************************/
24
25 static int data_fd = -1;
26 static uschar *spool_name = US"";
27
28 enum CH_STATE {LF_SEEN, MID_LINE, CR_SEEN};
29
30 #ifdef HAVE_LOCAL_SCAN
31 jmp_buf local_scan_env; /* error-handling context for local_scan */
32 unsigned had_local_scan_crash;
33 unsigned had_local_scan_timeout;
34 #endif
35
36
37 /*************************************************
38 * Non-SMTP character reading functions *
39 *************************************************/
40
41 /* These are the default functions that are set up in the variables such as
42 receive_getc initially. They just call the standard functions, passing stdin as
43 the file. (When SMTP input is occurring, different functions are used by
44 changing the pointer variables.) */
45
46 int
47 stdin_getc(unsigned lim)
48 {
49 int c = getc(stdin);
50
51 if (had_data_timeout)
52 {
53 fprintf(stderr, "exim: timed out while reading - message abandoned\n");
54 log_write(L_lost_incoming_connection,
55 LOG_MAIN, "timed out while reading local message");
56 receive_bomb_out(US"data-timeout", NULL); /* Does not return */
57 }
58 if (had_data_sigint)
59 {
60 if (filter_test == FTEST_NONE)
61 {
62 fprintf(stderr, "\nexim: %s received - message abandoned\n",
63 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
64 log_write(0, LOG_MAIN, "%s received while reading local message",
65 had_data_sigint == SIGTERM ? "SIGTERM" : "SIGINT");
66 }
67 receive_bomb_out(US"signal-exit", NULL); /* Does not return */
68 }
69 return c;
70 }
71
72 int
73 stdin_ungetc(int c)
74 {
75 return ungetc(c, stdin);
76 }
77
78 int
79 stdin_feof(void)
80 {
81 return feof(stdin);
82 }
83
84 int
85 stdin_ferror(void)
86 {
87 return ferror(stdin);
88 }
89
90
91
92
93 /*************************************************
94 * Check that a set sender is allowed *
95 *************************************************/
96
97 /* This function is called when a local caller sets an explicit sender address.
98 It checks whether this is permitted, which it is for trusted callers.
99 Otherwise, it must match the pattern(s) in untrusted_set_sender.
100
101 Arguments: the proposed sender address
102 Returns: TRUE for a trusted caller
103 TRUE if the address has been set, untrusted_set_sender has been
104 set, and the address matches something in the list
105 FALSE otherwise
106 */
107
108 BOOL
109 receive_check_set_sender(uschar *newsender)
110 {
111 uschar *qnewsender;
112 if (f.trusted_caller) return TRUE;
113 if (!newsender || !untrusted_set_sender) return FALSE;
114 qnewsender = Ustrchr(newsender, '@')
115 ? newsender : string_sprintf("%s@%s", newsender, qualify_domain_sender);
116 return match_address_list_basic(qnewsender, CUSS &untrusted_set_sender, 0) == OK;
117 }
118
119
120
121
122 /*************************************************
123 * Read space info for a partition *
124 *************************************************/
125
126 /* This function is called by receive_check_fs() below, and also by string
127 expansion for variables such as $spool_space. The field names for the statvfs
128 structure are macros, because not all OS have F_FAVAIL and it seems tidier to
129 have macros for F_BAVAIL and F_FILES as well. Some kinds of file system do not
130 have inodes, and they return -1 for the number available.
131
132 Later: It turns out that some file systems that do not have the concept of
133 inodes return 0 rather than -1. Such systems should also return 0 for the total
134 number of inodes, so we require that to be greater than zero before returning
135 an inode count.
136
137 Arguments:
138 isspool TRUE for spool partition, FALSE for log partition
139 inodeptr address of int to receive inode count; -1 if there isn't one
140
141 Returns: available on-root space, in kilobytes
142 -1 for log partition if there isn't one
143
144 All values are -1 if the STATFS functions are not available.
145 */
146
147 int_eximarith_t
148 receive_statvfs(BOOL isspool, int *inodeptr)
149 {
150 #ifdef HAVE_STATFS
151 struct STATVFS statbuf;
152 struct stat dummy;
153 uschar *path;
154 uschar *name;
155 uschar buffer[1024];
156
157 /* The spool directory must always exist. */
158
159 if (isspool)
160 {
161 path = spool_directory;
162 name = US"spool";
163 }
164
165 /* Need to cut down the log file path to the directory, and to ignore any
166 appearance of "syslog" in it. */
167
168 else
169 {
170 int sep = ':'; /* Not variable - outside scripts use */
171 const uschar *p = log_file_path;
172 name = US"log";
173
174 /* An empty log_file_path means "use the default". This is the same as an
175 empty item in a list. */
176
177 if (*p == 0) p = US":";
178 while ((path = string_nextinlist(&p, &sep, buffer, sizeof(buffer))))
179 if (Ustrcmp(path, "syslog") != 0)
180 break;
181
182 if (path == NULL) /* No log files */
183 {
184 *inodeptr = -1;
185 return -1;
186 }
187
188 /* An empty string means use the default, which is in the spool directory.
189 But don't just use the spool directory, as it is possible that the log
190 subdirectory has been symbolically linked elsewhere. */
191
192 if (path[0] == 0)
193 {
194 sprintf(CS buffer, CS"%s/log", CS spool_directory);
195 path = buffer;
196 }
197 else
198 {
199 uschar *cp;
200 if ((cp = Ustrrchr(path, '/')) != NULL) *cp = 0;
201 }
202 }
203
204 /* We now have the path; do the business */
205
206 memset(&statbuf, 0, sizeof(statbuf));
207
208 if (STATVFS(CS path, &statbuf) != 0)
209 if (stat(CS path, &dummy) == -1 && errno == ENOENT)
210 { /* Can happen on first run after installation */
211 *inodeptr = -1;
212 return -1;
213 }
214 else
215 {
216 log_write(0, LOG_MAIN|LOG_PANIC, "cannot accept message: failed to stat "
217 "%s directory %s: %s", name, path, strerror(errno));
218 smtp_closedown(US"spool or log directory problem");
219 exim_exit(EXIT_FAILURE, NULL);
220 }
221
222 *inodeptr = (statbuf.F_FILES > 0)? statbuf.F_FAVAIL : -1;
223
224 /* Disks are getting huge. Take care with computing the size in kilobytes. */
225
226 return (int_eximarith_t)(((double)statbuf.F_BAVAIL * (double)statbuf.F_FRSIZE)/1024.0);
227
228 #else
229 /* Unable to find partition sizes in this environment. */
230
231 *inodeptr = -1;
232 return -1;
233 #endif
234 }
235
236
237
238
239 /*************************************************
240 * Check space on spool and log partitions *
241 *************************************************/
242
243 /* This function is called before accepting a message; if any thresholds are
244 set, it checks them. If a message_size is supplied, it checks that there is
245 enough space for that size plus the threshold - i.e. that the message won't
246 reduce the space to the threshold. Not all OS have statvfs(); for those that
247 don't, this function always returns TRUE. For some OS the old function and
248 struct name statfs is used; that is handled by a macro, defined in exim.h.
249
250 Arguments:
251 msg_size the (estimated) size of an incoming message
252
253 Returns: FALSE if there isn't enough space, or if the information cannot
254 be obtained
255 TRUE if no check was done or there is enough space
256 */
257
258 BOOL
259 receive_check_fs(int msg_size)
260 {
261 int_eximarith_t space;
262 int inodes;
263
264 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
265 {
266 space = receive_statvfs(TRUE, &inodes);
267
268 DEBUG(D_receive)
269 debug_printf("spool directory space = " PR_EXIM_ARITH "K inodes = %d "
270 "check_space = " PR_EXIM_ARITH "K inodes = %d msg_size = %d\n",
271 space, inodes, check_spool_space, check_spool_inodes, msg_size);
272
273 if ((space >= 0 && space < check_spool_space) ||
274 (inodes >= 0 && inodes < check_spool_inodes))
275 {
276 log_write(0, LOG_MAIN, "spool directory space check failed: space="
277 PR_EXIM_ARITH " inodes=%d", space, inodes);
278 return FALSE;
279 }
280 }
281
282 if (check_log_space > 0 || check_log_inodes > 0)
283 {
284 space = receive_statvfs(FALSE, &inodes);
285
286 DEBUG(D_receive)
287 debug_printf("log directory space = " PR_EXIM_ARITH "K inodes = %d "
288 "check_space = " PR_EXIM_ARITH "K inodes = %d\n",
289 space, inodes, check_log_space, check_log_inodes);
290
291 if ( space >= 0 && space < check_log_space
292 || inodes >= 0 && inodes < check_log_inodes)
293 {
294 log_write(0, LOG_MAIN, "log directory space check failed: space=" PR_EXIM_ARITH
295 " inodes=%d", space, inodes);
296 return FALSE;
297 }
298 }
299
300 return TRUE;
301 }
302
303
304
305 /*************************************************
306 * Bomb out while reading a message *
307 *************************************************/
308
309 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
310 received, or if there is a timeout. A rarer case might be if the log files are
311 screwed up and Exim can't open them to record a message's arrival. Handling
312 that case is done by setting a flag to cause the log functions to call this
313 function if there is an ultimate disaster. That is why it is globally
314 accessible.
315
316 Arguments:
317 reason text reason to pass to the not-quit ACL
318 msg default SMTP response to give if in an SMTP session
319 Returns: it doesn't
320 */
321
322 void
323 receive_bomb_out(uschar *reason, uschar *msg)
324 {
325 static BOOL already_bombing_out;
326 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
327 timeouts, if someone has something slow in their quit ACL. Since the only
328 things we should be doing are to close down cleanly ASAP, on the second
329 pass we also close down stuff that might be opened again, before bypassing
330 the ACL call and exiting. */
331
332 /* If spool_name is set, it contains the name of the data file that is being
333 written. Unlink it before closing so that it cannot be picked up by a delivery
334 process. Ensure that any header file is also removed. */
335
336 if (spool_name[0] != '\0')
337 {
338 Uunlink(spool_name);
339 spool_name[Ustrlen(spool_name) - 1] = 'H';
340 Uunlink(spool_name);
341 spool_name[0] = '\0';
342 }
343
344 /* Now close the file if it is open, either as a fd or a stream. */
345
346 if (spool_data_file)
347 {
348 (void)fclose(spool_data_file);
349 spool_data_file = NULL;
350 }
351 else if (data_fd >= 0)
352 {
353 (void)close(data_fd);
354 data_fd = -1;
355 }
356
357 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
358 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
359 SMTP response. */
360
361 if (!already_bombing_out)
362 {
363 already_bombing_out = TRUE;
364 if (smtp_input)
365 {
366 if (smtp_batched_input)
367 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
368 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
369 smtp_active_hostname, msg);
370 }
371 }
372
373 /* Exit from the program (non-BSMTP cases) */
374
375 exim_exit(EXIT_FAILURE, NULL);
376 }
377
378
379 /*************************************************
380 * Data read timeout *
381 *************************************************/
382
383 /* Handler function for timeouts that occur while reading the data that
384 comprises a message.
385
386 Argument: the signal number
387 Returns: nothing
388 */
389
390 static void
391 data_timeout_handler(int sig)
392 {
393 had_data_timeout = sig;
394 }
395
396
397
398 #ifdef HAVE_LOCAL_SCAN
399 /*************************************************
400 * local_scan() timeout *
401 *************************************************/
402
403 /* Handler function for timeouts that occur while running a local_scan()
404 function. Posix recommends against calling longjmp() from a signal-handler,
405 but the GCC manual says you can so we will, and trust that it's better than
406 calling probably non-signal-safe funxtions during logging from within the
407 handler, even with other compilers.
408
409 See also https://cwe.mitre.org/data/definitions/745.html which also lists
410 it as unsafe.
411
412 This is all because we have no control over what might be written for a
413 local-scan function, so cannot sprinkle had-signal checks after each
414 call-site. At least with the default "do-nothing" function we won't
415 ever get here.
416
417 Argument: the signal number
418 Returns: nothing
419 */
420
421 static void
422 local_scan_timeout_handler(int sig)
423 {
424 had_local_scan_timeout = sig;
425 siglongjmp(local_scan_env, 1);
426 }
427
428
429
430 /*************************************************
431 * local_scan() crashed *
432 *************************************************/
433
434 /* Handler function for signals that occur while running a local_scan()
435 function.
436
437 Argument: the signal number
438 Returns: nothing
439 */
440
441 static void
442 local_scan_crash_handler(int sig)
443 {
444 had_local_scan_crash = sig;
445 siglongjmp(local_scan_env, 1);
446 }
447
448 #endif /*HAVE_LOCAL_SCAN*/
449
450
451 /*************************************************
452 * SIGTERM or SIGINT received *
453 *************************************************/
454
455 /* Handler for SIGTERM or SIGINT signals that occur while reading the
456 data that comprises a message.
457
458 Argument: the signal number
459 Returns: nothing
460 */
461
462 static void
463 data_sigterm_sigint_handler(int sig)
464 {
465 had_data_sigint = sig;
466 }
467
468
469
470 /*************************************************
471 * Add new recipient to list *
472 *************************************************/
473
474 /* This function builds a list of recipient addresses in argc/argv
475 format.
476
477 Arguments:
478 recipient the next address to add to recipients_list
479 pno parent number for fixed aliases; -1 otherwise
480
481 Returns: nothing
482 */
483
484 void
485 receive_add_recipient(uschar *recipient, int pno)
486 {
487 if (recipients_count >= recipients_list_max)
488 {
489 recipient_item *oldlist = recipients_list;
490 int oldmax = recipients_list_max;
491 recipients_list_max = recipients_list_max ? 2*recipients_list_max : 50;
492 recipients_list = store_get(recipients_list_max * sizeof(recipient_item), FALSE);
493 if (oldlist != NULL)
494 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
495 }
496
497 recipients_list[recipients_count].address = recipient;
498 recipients_list[recipients_count].pno = pno;
499 #ifdef EXPERIMENTAL_BRIGHTMAIL
500 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
501 /* reset optin string pointer for next recipient */
502 bmi_current_optin = NULL;
503 #endif
504 recipients_list[recipients_count].orcpt = NULL;
505 recipients_list[recipients_count].dsn_flags = 0;
506 recipients_list[recipients_count++].errors_to = NULL;
507 }
508
509
510
511
512 /*************************************************
513 * Send user response message *
514 *************************************************/
515
516 /* This function is passed a default response code and a user message. It calls
517 smtp_message_code() to check and possibly modify the response code, and then
518 calls smtp_respond() to transmit the response. I put this into a function
519 just to avoid a lot of repetition.
520
521 Arguments:
522 code the response code
523 user_msg the user message
524
525 Returns: nothing
526 */
527
528 #ifndef DISABLE_PRDR
529 static void
530 smtp_user_msg(uschar *code, uschar *user_msg)
531 {
532 int len = 3;
533 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
534 smtp_respond(code, len, TRUE, user_msg);
535 }
536 #endif
537
538
539
540
541
542 /*************************************************
543 * Remove a recipient from the list *
544 *************************************************/
545
546 /* This function is provided for local_scan() to use.
547
548 Argument:
549 recipient address to remove
550
551 Returns: TRUE if it did remove something; FALSE otherwise
552 */
553
554 BOOL
555 receive_remove_recipient(uschar *recipient)
556 {
557 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
558 recipient);
559 for (int count = 0; count < recipients_count; count++)
560 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
561 {
562 if ((--recipients_count - count) > 0)
563 memmove(recipients_list + count, recipients_list + count + 1,
564 (recipients_count - count)*sizeof(recipient_item));
565 return TRUE;
566 }
567 return FALSE;
568 }
569
570
571
572
573
574 /* Pause for a while waiting for input. If none received in that time,
575 close the logfile, if we had one open; then if we wait for a long-running
576 datasource (months, in one use-case) log rotation will not leave us holding
577 the file copy. */
578
579 static void
580 log_close_chk(void)
581 {
582 if (!receive_timeout)
583 {
584 struct timeval t;
585 timesince(&t, &received_time);
586 if (t.tv_sec > 30*60)
587 mainlog_close();
588 else
589 {
590 fd_set r;
591 FD_ZERO(&r); FD_SET(0, &r);
592 t.tv_sec = 30*60 - t.tv_sec; t.tv_usec = 0;
593 if (select(1, &r, NULL, NULL, &t) == 0) mainlog_close();
594 }
595 }
596 }
597
598 /*************************************************
599 * Read data portion of a non-SMTP message *
600 *************************************************/
601
602 /* This function is called to read the remainder of a message (following the
603 header) when the input is not from SMTP - we are receiving a local message on
604 a standard input stream. The message is always terminated by EOF, and is also
605 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
606 two cases for maximum efficiency.
607
608 Ensure that the body ends with a newline. This will naturally be the case when
609 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
610 as "sequences of lines" - this of course strictly applies only to SMTP, but
611 deliveries into BSD-type mailbox files also require it. Exim used to have a
612 flag for doing this at delivery time, but as it was always set for all
613 transports, I decided to simplify things by putting the check here instead.
614
615 There is at least one MUA (dtmail) that sends CRLF via this interface, and
616 other programs are known to do this as well. Exim used to have a option for
617 dealing with this: in July 2003, after much discussion, the code has been
618 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
619
620 However, for the case when a dot on a line by itself terminates a message, the
621 only recognized terminating sequences before and after the dot are LF and CRLF.
622 Otherwise, having read EOL . CR, you don't know whether to read another
623 character or not.
624
625 Internally, in messages stored in Exim's spool files, LF is used as the line
626 terminator. Under the new regime, bare CRs will no longer appear in these
627 files.
628
629 Arguments:
630 fout a FILE to which to write the message
631
632 Returns: One of the END_xxx values indicating why it stopped reading
633 */
634
635 static int
636 read_message_data(FILE *fout)
637 {
638 int ch_state;
639 register int ch;
640 register int linelength = 0;
641
642 /* Handle the case when only EOF terminates the message */
643
644 if (!f.dot_ends)
645 {
646 int last_ch = '\n';
647
648 for ( ;
649 log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF;
650 last_ch = ch)
651 {
652 if (ch == 0) body_zerocount++;
653 if (last_ch == '\r' && ch != '\n')
654 {
655 if (linelength > max_received_linelength)
656 max_received_linelength = linelength;
657 linelength = 0;
658 if (fputc('\n', fout) == EOF) return END_WERROR;
659 message_size++;
660 body_linecount++;
661 }
662 if (ch == '\r') continue;
663
664 if (fputc(ch, fout) == EOF) return END_WERROR;
665 if (ch == '\n')
666 {
667 if (linelength > max_received_linelength)
668 max_received_linelength = linelength;
669 linelength = 0;
670 body_linecount++;
671 }
672 else linelength++;
673 if (++message_size > thismessage_size_limit) return END_SIZE;
674 }
675
676 if (last_ch != '\n')
677 {
678 if (linelength > max_received_linelength)
679 max_received_linelength = linelength;
680 if (fputc('\n', fout) == EOF) return END_WERROR;
681 message_size++;
682 body_linecount++;
683 }
684
685 return END_EOF;
686 }
687
688 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
689
690 ch_state = 1;
691
692 while (log_close_chk(), (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
693 {
694 if (ch == 0) body_zerocount++;
695 switch (ch_state)
696 {
697 case 0: /* Normal state (previous char written) */
698 if (ch == '\n')
699 {
700 body_linecount++;
701 if (linelength > max_received_linelength)
702 max_received_linelength = linelength;
703 linelength = -1;
704 ch_state = 1;
705 }
706 else if (ch == '\r')
707 { ch_state = 2; continue; }
708 break;
709
710 case 1: /* After written "\n" */
711 if (ch == '.') { ch_state = 3; continue; }
712 if (ch == '\r') { ch_state = 2; continue; }
713 if (ch == '\n') { body_linecount++; linelength = -1; }
714 else ch_state = 0;
715 break;
716
717 case 2:
718 body_linecount++; /* After unwritten "\r" */
719 if (linelength > max_received_linelength)
720 max_received_linelength = linelength;
721 if (ch == '\n')
722 {
723 ch_state = 1;
724 linelength = -1;
725 }
726 else
727 {
728 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
729 if (ch == '\r') continue;
730 ch_state = 0;
731 linelength = 0;
732 }
733 break;
734
735 case 3: /* After "\n." (\n written, dot not) */
736 if (ch == '\n') return END_DOT;
737 if (ch == '\r') { ch_state = 4; continue; }
738 message_size++;
739 linelength++;
740 if (fputc('.', fout) == EOF) return END_WERROR;
741 ch_state = 0;
742 break;
743
744 case 4: /* After "\n.\r" (\n written, rest not) */
745 if (ch == '\n') return END_DOT;
746 message_size += 2;
747 body_linecount++;
748 if (fputs(".\n", fout) == EOF) return END_WERROR;
749 if (ch == '\r') { ch_state = 2; continue; }
750 ch_state = 0;
751 break;
752 }
753
754 linelength++;
755 if (fputc(ch, fout) == EOF) return END_WERROR;
756 if (++message_size > thismessage_size_limit) return END_SIZE;
757 }
758
759 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
760 the message ends with a newline, and we must also write any characters that
761 were saved up while testing for an ending dot. */
762
763 if (ch_state != 1)
764 {
765 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
766 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
767 message_size += Ustrlen(ends[ch_state]);
768 body_linecount++;
769 }
770
771 return END_EOF;
772 }
773
774
775
776
777 /*************************************************
778 * Read data portion of an SMTP message *
779 *************************************************/
780
781 /* This function is called to read the remainder of an SMTP message (after the
782 headers), or to skip over it when an error has occurred. In this case, the
783 output file is passed as NULL.
784
785 If any line begins with a dot, that character is skipped. The input should only
786 be successfully terminated by CR LF . CR LF unless it is local (non-network)
787 SMTP, in which case the CRs are optional, but...
788
789 FUDGE: It seems that sites on the net send out messages with just LF
790 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
791 we make the CRs optional in all cases.
792
793 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
794 well, so that there are no CRs in spooled messages. However, the message
795 terminating dot is not recognized between two bare CRs.
796
797 Arguments:
798 fout a FILE to which to write the message; NULL if skipping
799
800 Returns: One of the END_xxx values indicating why it stopped reading
801 */
802
803 static int
804 read_message_data_smtp(FILE *fout)
805 {
806 int ch_state = 0;
807 int ch;
808 int linelength = 0;
809
810 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
811 {
812 if (ch == 0) body_zerocount++;
813 switch (ch_state)
814 {
815 case 0: /* After LF or CRLF */
816 if (ch == '.')
817 {
818 ch_state = 3;
819 continue; /* Don't ever write . after LF */
820 }
821 ch_state = 1;
822
823 /* Else fall through to handle as normal uschar. */
824
825 case 1: /* Normal state */
826 if (ch == '\n')
827 {
828 ch_state = 0;
829 body_linecount++;
830 if (linelength > max_received_linelength)
831 max_received_linelength = linelength;
832 linelength = -1;
833 }
834 else if (ch == '\r')
835 {
836 ch_state = 2;
837 continue;
838 }
839 break;
840
841 case 2: /* After (unwritten) CR */
842 body_linecount++;
843 if (linelength > max_received_linelength)
844 max_received_linelength = linelength;
845 linelength = -1;
846 if (ch == '\n')
847 {
848 ch_state = 0;
849 }
850 else
851 {
852 message_size++;
853 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
854 cutthrough_data_put_nl();
855 if (ch != '\r') ch_state = 1; else continue;
856 }
857 break;
858
859 case 3: /* After [CR] LF . */
860 if (ch == '\n')
861 return END_DOT;
862 if (ch == '\r')
863 {
864 ch_state = 4;
865 continue;
866 }
867 /* The dot was removed at state 3. For a doubled dot, here, reinstate
868 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
869 and to file below. */
870 if (ch == '.')
871 {
872 uschar c= ch;
873 cutthrough_data_puts(&c, 1);
874 }
875 ch_state = 1;
876 break;
877
878 case 4: /* After [CR] LF . CR */
879 if (ch == '\n') return END_DOT;
880 message_size++;
881 body_linecount++;
882 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
883 cutthrough_data_put_nl();
884 if (ch == '\r')
885 {
886 ch_state = 2;
887 continue;
888 }
889 ch_state = 1;
890 break;
891 }
892
893 /* Add the character to the spool file, unless skipping; then loop for the
894 next. */
895
896 message_size++;
897 linelength++;
898 if (fout)
899 {
900 if (fputc(ch, fout) == EOF) return END_WERROR;
901 if (message_size > thismessage_size_limit) return END_SIZE;
902 }
903 if(ch == '\n')
904 cutthrough_data_put_nl();
905 else
906 {
907 uschar c = ch;
908 cutthrough_data_puts(&c, 1);
909 }
910 }
911
912 /* Fall through here if EOF encountered. This indicates some kind of error,
913 since a correct message is terminated by [CR] LF . [CR] LF. */
914
915 return END_EOF;
916 }
917
918
919
920
921 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
922 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
923 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
924 body_linecount accounting for proper re-expansion for the wire, so use
925 a cut-down version of the state-machine above; we don't need to do leading-dot
926 detection and unstuffing.
927
928 Arguments:
929 fout a FILE to which to write the message; NULL if skipping;
930 must be open for both writing and reading.
931
932 Returns: One of the END_xxx values indicating why it stopped reading
933 */
934
935 static int
936 read_message_bdat_smtp(FILE *fout)
937 {
938 int linelength = 0, ch;
939 enum CH_STATE ch_state = LF_SEEN;
940 BOOL fix_nl = FALSE;
941
942 for(;;)
943 {
944 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
945 {
946 case EOF: return END_EOF;
947 case ERR: return END_PROTOCOL;
948 case EOD:
949 /* Nothing to get from the sender anymore. We check the last
950 character written to the spool.
951
952 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
953 If we would be strict, we would refuse such broken messages.
954 But we are liberal, so we fix it. It would be easy just to append
955 the "\n" to the spool.
956
957 But there are some more things (line counting, message size calculation and such),
958 that would need to be duplicated here. So we simply do some ungetc
959 trickery.
960 */
961 if (fout)
962 {
963 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
964 if (fgetc(fout) == '\n') return END_DOT;
965 }
966
967 if (linelength == -1) /* \r already seen (see below) */
968 {
969 DEBUG(D_receive) debug_printf("Add missing LF\n");
970 bdat_ungetc('\n');
971 continue;
972 }
973 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
974 bdat_ungetc('\r'); /* not even \r was seen */
975 fix_nl = TRUE;
976
977 continue;
978 case '\0': body_zerocount++; break;
979 }
980 switch (ch_state)
981 {
982 case LF_SEEN: /* After LF or CRLF */
983 ch_state = MID_LINE;
984 /* fall through to handle as normal uschar. */
985
986 case MID_LINE: /* Mid-line state */
987 if (ch == '\n')
988 {
989 ch_state = LF_SEEN;
990 body_linecount++;
991 if (linelength > max_received_linelength)
992 max_received_linelength = linelength;
993 linelength = -1;
994 }
995 else if (ch == '\r')
996 {
997 ch_state = CR_SEEN;
998 if (fix_nl) bdat_ungetc('\n');
999 continue; /* don't write CR */
1000 }
1001 break;
1002
1003 case CR_SEEN: /* After (unwritten) CR */
1004 body_linecount++;
1005 if (linelength > max_received_linelength)
1006 max_received_linelength = linelength;
1007 linelength = -1;
1008 if (ch == '\n')
1009 ch_state = LF_SEEN;
1010 else
1011 {
1012 message_size++;
1013 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
1014 cutthrough_data_put_nl();
1015 if (ch == '\r') continue; /* don't write CR */
1016 ch_state = MID_LINE;
1017 }
1018 break;
1019 }
1020
1021 /* Add the character to the spool file, unless skipping */
1022
1023 message_size++;
1024 linelength++;
1025 if (fout)
1026 {
1027 if (fputc(ch, fout) == EOF) return END_WERROR;
1028 if (message_size > thismessage_size_limit) return END_SIZE;
1029 }
1030 if(ch == '\n')
1031 cutthrough_data_put_nl();
1032 else
1033 {
1034 uschar c = ch;
1035 cutthrough_data_puts(&c, 1);
1036 }
1037 }
1038 /*NOTREACHED*/
1039 }
1040
1041 static int
1042 read_message_bdat_smtp_wire(FILE *fout)
1043 {
1044 int ch;
1045
1046 /* Remember that this message uses wireformat. */
1047
1048 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1049 fout ? "writing spoolfile in wire format" : "flushing input");
1050 f.spool_file_wireformat = TRUE;
1051
1052 for (;;)
1053 {
1054 if (chunking_data_left > 0)
1055 {
1056 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1057 uschar * buf = bdat_getbuf(&len);
1058
1059 if (!buf) return END_EOF;
1060 message_size += len;
1061 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1062 }
1063 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1064 {
1065 case EOF: return END_EOF;
1066 case EOD: return END_DOT;
1067 case ERR: return END_PROTOCOL;
1068
1069 default:
1070 message_size++;
1071 /*XXX not done:
1072 linelength
1073 max_received_linelength
1074 body_linecount
1075 body_zerocount
1076 */
1077 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1078 break;
1079 }
1080 if (message_size > thismessage_size_limit) return END_SIZE;
1081 }
1082 /*NOTREACHED*/
1083 }
1084
1085
1086
1087
1088 /*************************************************
1089 * Swallow SMTP message *
1090 *************************************************/
1091
1092 /* This function is called when there has been some kind of error while reading
1093 an SMTP message, and the remaining data may need to be swallowed. It is global
1094 because it is called from smtp_closedown() to shut down an incoming call
1095 tidily.
1096
1097 Argument: a FILE from which to read the message
1098 Returns: nothing
1099 */
1100
1101 void
1102 receive_swallow_smtp(void)
1103 {
1104 if (message_ended >= END_NOTENDED)
1105 message_ended = chunking_state <= CHUNKING_OFFERED
1106 ? read_message_data_smtp(NULL)
1107 : read_message_bdat_smtp_wire(NULL);
1108 }
1109
1110
1111
1112 /*************************************************
1113 * Handle lost SMTP connection *
1114 *************************************************/
1115
1116 /* This function logs connection loss incidents and generates an appropriate
1117 SMTP response.
1118
1119 Argument: additional data for the message
1120 Returns: the SMTP response
1121 */
1122
1123 static uschar *
1124 handle_lost_connection(uschar *s)
1125 {
1126 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1127 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1128 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1129 return US"421 Lost incoming connection";
1130 }
1131
1132
1133
1134
1135 /*************************************************
1136 * Handle a non-smtp reception error *
1137 *************************************************/
1138
1139 /* This function is called for various errors during the reception of non-SMTP
1140 messages. It either sends a message to the sender of the problem message, or it
1141 writes to the standard error stream.
1142
1143 Arguments:
1144 errcode code for moan_to_sender(), identifying the error
1145 text1 first message text, passed to moan_to_sender()
1146 text2 second message text, used only for stderrr
1147 error_rc code to pass to exim_exit if no problem
1148 f FILE containing body of message (may be stdin)
1149 hptr pointer to instore headers or NULL
1150
1151 Returns: calls exim_exit(), which does not return
1152 */
1153
1154 static void
1155 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1156 FILE *f, header_line *hptr)
1157 {
1158 if (error_handling == ERRORS_SENDER)
1159 {
1160 error_block eblock;
1161 eblock.next = NULL;
1162 eblock.text1 = text1;
1163 eblock.text2 = US"";
1164 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1165 error_rc = EXIT_FAILURE;
1166 }
1167 else
1168 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1169 (void)fclose(f);
1170 exim_exit(error_rc, US"");
1171 }
1172
1173
1174
1175 /*************************************************
1176 * Add header lines set up by ACL *
1177 *************************************************/
1178
1179 /* This function is called to add the header lines that were set up by
1180 statements in an ACL to the list of headers in memory. It is done in two stages
1181 like this, because when the ACL for RCPT is running, the other headers have not
1182 yet been received. This function is called twice; once just before running the
1183 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1184 are visible to the DATA ACL.
1185
1186 Originally these header lines were added at the end. Now there is support for
1187 three different places: top, bottom, and after the Received: header(s). There
1188 will always be at least one Received: header, even if it is marked deleted, and
1189 even if something else has been put in front of it.
1190
1191 Arguments:
1192 acl_name text to identify which ACL
1193
1194 Returns: nothing
1195 */
1196
1197 static void
1198 add_acl_headers(int where, uschar *acl_name)
1199 {
1200 header_line *last_received = NULL;
1201
1202 switch(where)
1203 {
1204 case ACL_WHERE_DKIM:
1205 case ACL_WHERE_MIME:
1206 case ACL_WHERE_DATA:
1207 if ( cutthrough.cctx.sock >= 0 && cutthrough.delivery
1208 && (acl_removed_headers || acl_added_headers))
1209 {
1210 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1211 " will not take effect on cutthrough deliveries");
1212 return;
1213 }
1214 }
1215
1216 if (acl_removed_headers)
1217 {
1218 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1219
1220 for (header_line * h = header_list; h; h = h->next) if (h->type != htype_old)
1221 {
1222 const uschar * list = acl_removed_headers;
1223 int sep = ':'; /* This is specified as a colon-separated list */
1224 uschar *s;
1225 uschar buffer[128];
1226
1227 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1228 if (header_testname(h, s, Ustrlen(s), FALSE))
1229 {
1230 h->type = htype_old;
1231 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1232 }
1233 }
1234 acl_removed_headers = NULL;
1235 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1236 }
1237
1238 if (!acl_added_headers) return;
1239 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1240
1241 for (header_line * h = acl_added_headers, * next; h; h = next)
1242 {
1243 next = h->next;
1244
1245 switch(h->type)
1246 {
1247 case htype_add_top:
1248 h->next = header_list;
1249 header_list = h;
1250 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1251 break;
1252
1253 case htype_add_rec:
1254 if (!last_received)
1255 {
1256 last_received = header_list;
1257 while (!header_testname(last_received, US"Received", 8, FALSE))
1258 last_received = last_received->next;
1259 while (last_received->next &&
1260 header_testname(last_received->next, US"Received", 8, FALSE))
1261 last_received = last_received->next;
1262 }
1263 h->next = last_received->next;
1264 last_received->next = h;
1265 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1266 break;
1267
1268 case htype_add_rfc:
1269 /* add header before any header which is NOT Received: or Resent- */
1270 last_received = header_list;
1271 while ( last_received->next &&
1272 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1273 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1274 last_received = last_received->next;
1275 /* last_received now points to the last Received: or Resent-* header
1276 in an uninterrupted chain of those header types (seen from the beginning
1277 of all headers. Our current header must follow it. */
1278 h->next = last_received->next;
1279 last_received->next = h;
1280 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1281 break;
1282
1283 default:
1284 h->next = NULL;
1285 header_last->next = h;
1286 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1287 break;
1288 }
1289
1290 if (!h->next) header_last = h;
1291
1292 /* Check for one of the known header types (From:, To:, etc.) though in
1293 practice most added headers are going to be "other". Lower case
1294 identification letters are never stored with the header; they are used
1295 for existence tests when messages are received. So discard any lower case
1296 flag values. */
1297
1298 h->type = header_checkname(h, FALSE);
1299 if (h->type >= 'a') h->type = htype_other;
1300
1301 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1302 }
1303
1304 acl_added_headers = NULL;
1305 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1306 }
1307
1308
1309
1310 /*************************************************
1311 * Add host information for log line *
1312 *************************************************/
1313
1314 /* Called for acceptance and rejecting log lines. This adds information about
1315 the calling host to a string that is being built dynamically.
1316
1317 Arguments:
1318 s the dynamic string
1319
1320 Returns: the extended string
1321 */
1322
1323 static gstring *
1324 add_host_info_for_log(gstring * g)
1325 {
1326 if (sender_fullhost)
1327 {
1328 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1329 g = string_catn(g, US" DS", 3);
1330 g = string_append(g, 2, US" H=", sender_fullhost);
1331 if (LOGGING(incoming_interface) && interface_address)
1332 g = string_fmt_append(g, " I=[%s]:%d", interface_address, interface_port);
1333 }
1334 if (f.tcp_in_fastopen && !f.tcp_in_fastopen_logged)
1335 {
1336 g = string_catn(g, US" TFO*", f.tcp_in_fastopen_data ? 5 : 4);
1337 f.tcp_in_fastopen_logged = TRUE;
1338 }
1339 if (sender_ident)
1340 g = string_append(g, 2, US" U=", sender_ident);
1341 if (received_protocol)
1342 g = string_append(g, 2, US" P=", received_protocol);
1343 if (LOGGING(pipelining) && f.smtp_in_pipelining_advertised)
1344 {
1345 g = string_catn(g, US" L", 2);
1346 #ifndef DISABLE_PIPE_CONNECT
1347 if (f.smtp_in_early_pipe_used)
1348 g = string_catn(g, US"*", 1);
1349 else if (f.smtp_in_early_pipe_advertised)
1350 g = string_catn(g, US".", 1);
1351 #endif
1352 if (!f.smtp_in_pipelining_used)
1353 g = string_catn(g, US"-", 1);
1354 }
1355 return g;
1356 }
1357
1358
1359
1360 #ifdef WITH_CONTENT_SCAN
1361
1362 /*************************************************
1363 * Run the MIME ACL on a message *
1364 *************************************************/
1365
1366 /* This code is in a subroutine so that it can be used for both SMTP
1367 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1368
1369 Arguments:
1370 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1371 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1372 smtp_reply_ptr Where SMTP reply is being built
1373 blackholed_by_ptr Where "blackholed by" message is being built
1374
1375 Returns: TRUE to carry on; FALSE to abandon the message
1376 */
1377
1378 static BOOL
1379 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1380 uschar **blackholed_by_ptr)
1381 {
1382 FILE *mbox_file;
1383 uschar * rfc822_file_path = NULL;
1384 unsigned long mbox_size;
1385 uschar *user_msg, *log_msg;
1386 int mime_part_count_buffer = -1;
1387 uschar * mbox_filename;
1388 int rc = OK;
1389
1390 /* check if it is a MIME message */
1391
1392 for (header_line * my_headerlist = header_list; my_headerlist;
1393 my_headerlist = my_headerlist->next)
1394 if ( my_headerlist->type != '*' /* skip deleted headers */
1395 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1396 )
1397 {
1398 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1399 goto DO_MIME_ACL;
1400 }
1401
1402 mime_part_count = -1;
1403 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1404 return TRUE;
1405
1406 DO_MIME_ACL:
1407
1408 /* make sure the eml mbox file is spooled up */
1409 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1410 { /* error while spooling */
1411 log_write(0, LOG_MAIN|LOG_PANIC,
1412 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1413 Uunlink(spool_name);
1414 unspool_mbox();
1415 #ifdef EXPERIMENTAL_DCC
1416 dcc_ok = 0;
1417 #endif
1418 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1419 message_id[0] = 0; /* Indicate no message accepted */
1420 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1421 return FALSE; /* Indicate skip to end of receive function */
1422 }
1423
1424 mime_is_rfc822 = 0;
1425
1426 MIME_ACL_CHECK:
1427 mime_part_count = -1;
1428 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1429 (void)fclose(mbox_file);
1430
1431 if (rfc822_file_path)
1432 {
1433 mime_part_count = mime_part_count_buffer;
1434
1435 if (unlink(CS rfc822_file_path) == -1)
1436 {
1437 log_write(0, LOG_PANIC,
1438 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1439 goto END_MIME_ACL;
1440 }
1441 rfc822_file_path = NULL;
1442 }
1443
1444 /* check if we must check any message/rfc822 attachments */
1445 if (rc == OK)
1446 {
1447 uschar * scandir = string_copyn(mbox_filename,
1448 Ustrrchr(mbox_filename, '/') - mbox_filename);
1449 struct dirent * entry;
1450 DIR * tempdir;
1451
1452 for (tempdir = opendir(CS scandir); entry = readdir(tempdir); )
1453 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1454 {
1455 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1456 DEBUG(D_receive)
1457 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1458 rfc822_file_path);
1459 break;
1460 }
1461 closedir(tempdir);
1462
1463 if (rfc822_file_path)
1464 {
1465 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1466 {
1467 /* set RFC822 expansion variable */
1468 mime_is_rfc822 = 1;
1469 mime_part_count_buffer = mime_part_count;
1470 goto MIME_ACL_CHECK;
1471 }
1472 log_write(0, LOG_PANIC,
1473 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1474 unlink(CS rfc822_file_path);
1475 }
1476 }
1477
1478 END_MIME_ACL:
1479 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1480 if (rc == DISCARD)
1481 {
1482 recipients_count = 0;
1483 *blackholed_by_ptr = US"MIME ACL";
1484 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1485 }
1486 else if (rc != OK)
1487 {
1488 Uunlink(spool_name);
1489 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1490 unspool_mbox();
1491 #ifdef EXPERIMENTAL_DCC
1492 dcc_ok = 0;
1493 #endif
1494 if (smtp_input)
1495 {
1496 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1497 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1498 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1499 }
1500 message_id[0] = 0; /* Indicate no message accepted */
1501 return FALSE; /* Cause skip to end of receive function */
1502 }
1503
1504 return TRUE;
1505 }
1506
1507 #endif /* WITH_CONTENT_SCAN */
1508
1509
1510
1511 void
1512 received_header_gen(void)
1513 {
1514 uschar *received;
1515 uschar *timestamp;
1516 header_line *received_header= header_list;
1517
1518 timestamp = expand_string(US"${tod_full}");
1519 if (recipients_count == 1) received_for = recipients_list[0].address;
1520 received = expand_string(received_header_text);
1521 received_for = NULL;
1522
1523 if (!received)
1524 {
1525 if(spool_name[0] != 0)
1526 Uunlink(spool_name); /* Lose the data file */
1527 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1528 "(received_header_text) failed: %s", string_printing(received_header_text),
1529 expand_string_message);
1530 }
1531
1532 /* The first element on the header chain is reserved for the Received header,
1533 so all we have to do is fill in the text pointer, and set the type. However, if
1534 the result of the expansion is an empty string, we leave the header marked as
1535 "old" so as to refrain from adding a Received header. */
1536
1537 if (received[0] == 0)
1538 {
1539 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1540 received_header->type = htype_old;
1541 }
1542 else
1543 {
1544 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1545 received_header->type = htype_received;
1546 }
1547
1548 received_header->slen = Ustrlen(received_header->text);
1549
1550 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1551 received_header->type, received_header->text);
1552 }
1553
1554
1555
1556 /*************************************************
1557 * Receive message *
1558 *************************************************/
1559
1560 /* Receive a message on the given input, and put it into a pair of spool files.
1561 Either a non-null list of recipients, or the extract flag will be true, or
1562 both. The flag sender_local is true for locally generated messages. The flag
1563 submission_mode is true if an ACL has obeyed "control = submission". The flag
1564 suppress_local_fixups is true if an ACL has obeyed "control =
1565 suppress_local_fixups" or -G was passed on the command-line.
1566 The flag smtp_input is true if the message is to be
1567 handled using SMTP conventions about termination and lines starting with dots.
1568 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1569
1570 If a message was successfully read, message_id[0] will be non-zero.
1571
1572 The general actions of this function are:
1573
1574 . Read the headers of the message (if any) into a chain of store
1575 blocks.
1576
1577 . If there is a "sender:" header and the message is locally originated,
1578 throw it away, unless the caller is trusted, or unless
1579 active_local_sender_retain is set - which can only happen if
1580 active_local_from_check is false.
1581
1582 . If recipients are to be extracted from the message, build the
1583 recipients list from the headers, removing any that were on the
1584 original recipients list (unless extract_addresses_remove_arguments is
1585 false), and at the same time, remove any bcc header that may be present.
1586
1587 . Get the spool file for the data, sort out its unique name, open
1588 and lock it (but don't give it the name yet).
1589
1590 . Generate a "Message-Id" header if the message doesn't have one, for
1591 locally-originated messages.
1592
1593 . Generate a "Received" header.
1594
1595 . Ensure the recipients list is fully qualified and rewritten if necessary.
1596
1597 . If there are any rewriting rules, apply them to the sender address
1598 and also to the headers.
1599
1600 . If there is no from: header, generate one, for locally-generated messages
1601 and messages in "submission mode" only.
1602
1603 . If the sender is local, check that from: is correct, and if not, generate
1604 a Sender: header, unless message comes from a trusted caller, or this
1605 feature is disabled by active_local_from_check being false.
1606
1607 . If there is no "date" header, generate one, for locally-originated
1608 or submission mode messages only.
1609
1610 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1611 dot_ends mode, to the data file. Leave it open, to hold the lock.
1612
1613 . Write the envelope and the headers to a new file.
1614
1615 . Set the name for the header file; close it.
1616
1617 . Set the name for the data file; close it.
1618
1619 Because this function can potentially be called many times in a single
1620 SMTP connection, all store should be got by store_get(), so that it will be
1621 automatically retrieved after the message is accepted.
1622
1623 FUDGE: It seems that sites on the net send out messages with just LF
1624 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1625 we make the CRs optional in all cases.
1626
1627 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1628 new regime is now in place in which bare CRs in header lines are turned into LF
1629 followed by a space, so as not to terminate the header line.
1630
1631 February 2004: A bare LF in a header line in a message whose first line was
1632 terminated by CRLF is treated in the same way as a bare CR.
1633
1634 Arguments:
1635 extract_recip TRUE if recipients are to be extracted from the message's
1636 headers
1637
1638 Returns: TRUE there are more messages to be read (SMTP input)
1639 FALSE there are no more messages to be read (non-SMTP input
1640 or SMTP connection collapsed, or other failure)
1641
1642 When reading a message for filter testing, the returned value indicates
1643 whether the headers (which is all that is read) were terminated by '.' or
1644 not. */
1645
1646 BOOL
1647 receive_msg(BOOL extract_recip)
1648 {
1649 int rc = FAIL;
1650 int msg_size = 0;
1651 int process_info_len = Ustrlen(process_info);
1652 int error_rc = error_handling == ERRORS_SENDER
1653 ? errors_sender_rc : EXIT_FAILURE;
1654 int header_size = 256;
1655 int start, end, domain;
1656 int id_resolution = 0;
1657 int had_zero = 0;
1658 int prevlines_length = 0;
1659
1660 int ptr = 0;
1661
1662 BOOL contains_resent_headers = FALSE;
1663 BOOL extracted_ignored = FALSE;
1664 BOOL first_line_ended_crlf = TRUE_UNSET;
1665 BOOL smtp_yield = TRUE;
1666 BOOL yield = FALSE;
1667
1668 BOOL resents_exist = FALSE;
1669 uschar *resent_prefix = US"";
1670 uschar *blackholed_by = NULL;
1671 uschar *blackhole_log_msg = US"";
1672 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1673
1674 flock_t lock_data;
1675 error_block *bad_addresses = NULL;
1676
1677 uschar *frozen_by = NULL;
1678 uschar *queued_by = NULL;
1679
1680 uschar *errmsg;
1681 rmark rcvd_log_reset_point;
1682 gstring * g;
1683 struct stat statbuf;
1684
1685 /* Final message to give to SMTP caller, and messages from ACLs */
1686
1687 uschar *smtp_reply = NULL;
1688 uschar *user_msg, *log_msg;
1689
1690 /* Working header pointers */
1691
1692 rmark reset_point;
1693 header_line *next;
1694
1695 /* Flags for noting the existence of certain headers (only one left) */
1696
1697 BOOL date_header_exists = FALSE;
1698
1699 /* Pointers to receive the addresses of headers whose contents we need. */
1700
1701 header_line *from_header = NULL;
1702 header_line *subject_header = NULL;
1703 header_line *msgid_header = NULL;
1704 header_line *received_header;
1705 BOOL msgid_header_newly_created = FALSE;
1706
1707 /* Variables for use when building the Received: header. */
1708
1709 uschar *timestamp;
1710 int tslen;
1711
1712
1713 /* Release any open files that might have been cached while preparing to
1714 accept the message - e.g. by verifying addresses - because reading a message
1715 might take a fair bit of real time. */
1716
1717 search_tidyup();
1718
1719 /* Extracting the recipient list from an input file is incompatible with
1720 cutthrough delivery with the no-spool option. It shouldn't be possible
1721 to set up the combination, but just in case kill any ongoing connection. */
1722 if (extract_recip || !smtp_input)
1723 cancel_cutthrough_connection(TRUE, US"not smtp input");
1724
1725 /* Initialize the chain of headers by setting up a place-holder for Received:
1726 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1727 pointing to the end of the chain to make adding headers simple. */
1728
1729 received_header = header_list = header_last = store_get(sizeof(header_line), FALSE);
1730 header_list->next = NULL;
1731 header_list->type = htype_old;
1732 header_list->text = NULL;
1733 header_list->slen = 0;
1734
1735 /* Control block for the next header to be read. */
1736
1737 reset_point = store_mark();
1738 next = store_get(sizeof(header_line), FALSE); /* not tainted */
1739 next->text = store_get(header_size, TRUE); /* tainted */
1740
1741 /* Initialize message id to be null (indicating no message read), and the
1742 header names list to be the normal list. Indicate there is no data file open
1743 yet, initialize the size and warning count, and deal with no size limit. */
1744
1745 message_id[0] = 0;
1746 spool_data_file = NULL;
1747 data_fd = -1;
1748 spool_name = US"";
1749 message_size = 0;
1750 warning_count = 0;
1751 received_count = 1; /* For the one we will add */
1752
1753 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1754
1755 /* While reading the message, the following counts are computed. */
1756
1757 message_linecount = body_linecount = body_zerocount =
1758 max_received_linelength = 0;
1759
1760 #ifdef WITH_CONTENT_SCAN
1761 /* reset non-per-part mime variables */
1762 mime_is_coverletter = 0;
1763 mime_is_rfc822 = 0;
1764 mime_part_count = -1;
1765 #endif
1766
1767 #ifndef DISABLE_DKIM
1768 /* Call into DKIM to set up the context. In CHUNKING mode
1769 we clear the dot-stuffing flag */
1770 if (smtp_input && !smtp_batched_input && !f.dkim_disable_verify)
1771 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1772 #endif
1773
1774 #ifdef SUPPORT_DMARC
1775 if (sender_host_address) dmarc_init(); /* initialize libopendmarc */
1776 #endif
1777
1778 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1779 ids, and fractions of a second are required. See the comments that precede the
1780 message id creation below. */
1781
1782 (void)gettimeofday(&message_id_tv, NULL);
1783
1784 /* For other uses of the received time we can operate with granularity of one
1785 second, and for that we use the global variable received_time. This is for
1786 things like ultimate message timeouts. */
1787
1788 received_time = message_id_tv;
1789
1790 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1791 happen in the smtp_getc() function when it refills its buffer. */
1792
1793 had_data_timeout = 0;
1794 if (smtp_input)
1795 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1796
1797 /* If not SMTP input, timeout happens only if configured, and we just set a
1798 single timeout for the whole message. */
1799
1800 else if (receive_timeout > 0)
1801 {
1802 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1803 ALARM(receive_timeout);
1804 }
1805
1806 /* SIGTERM and SIGINT are caught always. */
1807
1808 had_data_sigint = 0;
1809 signal(SIGTERM, data_sigterm_sigint_handler);
1810 signal(SIGINT, data_sigterm_sigint_handler);
1811
1812 /* Header lines in messages are not supposed to be very long, though when
1813 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1814 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1815 storing the header, and extend this as necessary using string_cat().
1816
1817 To cope with total lunacies, impose an upper limit on the length of the header
1818 section of the message, as otherwise the store will fill up. We must also cope
1819 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1820 Folded header lines are joined into one string, leaving the '\n' characters
1821 inside them, so that writing them out reproduces the input.
1822
1823 Loop for each character of each header; the next structure for chaining the
1824 header is set up already, with ptr the offset of the next character in
1825 next->text. */
1826
1827 for (;;)
1828 {
1829 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1830
1831 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1832 SMTP must have a correct "." terminator. */
1833
1834 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1835 {
1836 smtp_reply = handle_lost_connection(US" (header)");
1837 smtp_yield = FALSE;
1838 goto TIDYUP; /* Skip to end of function */
1839 }
1840
1841 /* See if we are at the current header's size limit - there must be at least
1842 four bytes left. This allows for the new character plus a zero, plus two for
1843 extra insertions when we are playing games with dots and carriage returns. If
1844 we are at the limit, extend the text buffer. This could have been done
1845 automatically using string_cat() but because this is a tightish loop storing
1846 only one character at a time, we choose to do it inline. Normally
1847 store_extend() will be able to extend the block; only at the end of a big
1848 store block will a copy be needed. To handle the case of very long headers
1849 (and sometimes lunatic messages can have ones that are 100s of K long) we
1850 call store_release() for strings that have been copied - if the string is at
1851 the start of a block (and therefore the only thing in it, because we aren't
1852 doing any other gets), the block gets freed. We can only do this release if
1853 there were no allocations since the once that we want to free. */
1854
1855 if (ptr >= header_size - 4)
1856 {
1857 int oldsize = header_size;
1858
1859 if (header_size >= INT_MAX/2)
1860 goto OVERSIZE;
1861 header_size *= 2;
1862
1863 /* The data came from the message, so is tainted. */
1864
1865 if (!store_extend(next->text, TRUE, oldsize, header_size))
1866 next->text = store_newblock(next->text, TRUE, header_size, ptr);
1867 }
1868
1869 /* Cope with receiving a binary zero. There is dispute about whether
1870 these should be allowed in RFC 822 messages. The middle view is that they
1871 should not be allowed in headers, at least. Exim takes this attitude at
1872 the moment. We can't just stomp on them here, because we don't know that
1873 this line is a header yet. Set a flag to cause scanning later. */
1874
1875 if (ch == 0) had_zero++;
1876
1877 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1878 those from data files use just LF. Treat LF in local SMTP input as a
1879 terminator too. Treat EOF as a line terminator always. */
1880
1881 if (ch == EOF) goto EOL;
1882
1883 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1884 other MTAs accept this. We are therefore forced into this "liberalisation"
1885 too, so we accept LF as a line terminator whatever the source of the message.
1886 However, if the first line of the message ended with a CRLF, we treat a bare
1887 LF specially by inserting a white space after it to ensure that the header
1888 line is not terminated. */
1889
1890 if (ch == '\n')
1891 {
1892 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1893 else if (first_line_ended_crlf) receive_ungetc(' ');
1894 goto EOL;
1895 }
1896
1897 /* This is not the end of the line. If this is SMTP input and this is
1898 the first character in the line and it is a "." character, ignore it.
1899 This implements the dot-doubling rule, though header lines starting with
1900 dots aren't exactly common. They are legal in RFC 822, though. If the
1901 following is CRLF or LF, this is the line that that terminates the
1902 entire message. We set message_ended to indicate this has happened (to
1903 prevent further reading), and break out of the loop, having freed the
1904 empty header, and set next = NULL to indicate no data line. */
1905
1906 if (ptr == 0 && ch == '.' && f.dot_ends)
1907 {
1908 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1909 if (ch == '\r')
1910 {
1911 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1912 if (ch != '\n')
1913 {
1914 receive_ungetc(ch);
1915 ch = '\r'; /* Revert to CR */
1916 }
1917 }
1918 if (ch == '\n')
1919 {
1920 message_ended = END_DOT;
1921 reset_point = store_reset(reset_point);
1922 next = NULL;
1923 break; /* End character-reading loop */
1924 }
1925
1926 /* For non-SMTP input, the dot at the start of the line was really a data
1927 character. What is now in ch is the following character. We guaranteed
1928 enough space for this above. */
1929
1930 if (!smtp_input)
1931 {
1932 next->text[ptr++] = '.';
1933 message_size++;
1934 }
1935 }
1936
1937 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1938 remember this case if this is the first line ending. */
1939
1940 if (ch == '\r')
1941 {
1942 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1943 if (ch == '\n')
1944 {
1945 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1946 goto EOL;
1947 }
1948
1949 /* Otherwise, put back the character after CR, and turn the bare CR
1950 into LF SP. */
1951
1952 ch = (receive_ungetc)(ch);
1953 next->text[ptr++] = '\n';
1954 message_size++;
1955 ch = ' ';
1956 }
1957
1958 /* We have a data character for the header line. */
1959
1960 next->text[ptr++] = ch; /* Add to buffer */
1961 message_size++; /* Total message size so far */
1962
1963 /* Handle failure due to a humungously long header section. The >= allows
1964 for the terminating \n. Add what we have so far onto the headers list so
1965 that it gets reflected in any error message, and back up the just-read
1966 character. */
1967
1968 if (message_size >= header_maxsize)
1969 {
1970 OVERSIZE:
1971 next->text[ptr] = 0;
1972 next->slen = ptr;
1973 next->type = htype_other;
1974 next->next = NULL;
1975 header_last->next = next;
1976 header_last = next;
1977
1978 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1979 "%s (more than %d characters): message abandoned",
1980 f.sender_host_unknown ? sender_ident : sender_fullhost, header_maxsize);
1981
1982 if (smtp_input)
1983 {
1984 smtp_reply = US"552 Message header is ridiculously long";
1985 receive_swallow_smtp();
1986 goto TIDYUP; /* Skip to end of function */
1987 }
1988
1989 else
1990 {
1991 give_local_error(ERRMESS_VLONGHEADER,
1992 string_sprintf("message header longer than %d characters received: "
1993 "message not accepted", header_maxsize), US"", error_rc, stdin,
1994 header_list->next);
1995 /* Does not return */
1996 }
1997 }
1998
1999 continue; /* With next input character */
2000
2001 /* End of header line reached */
2002
2003 EOL:
2004
2005 /* Keep track of lines for BSMTP errors and overall message_linecount. */
2006
2007 receive_linecount++;
2008 message_linecount++;
2009
2010 /* Keep track of maximum line length */
2011
2012 if (ptr - prevlines_length > max_received_linelength)
2013 max_received_linelength = ptr - prevlines_length;
2014 prevlines_length = ptr + 1;
2015
2016 /* Now put in the terminating newline. There is always space for
2017 at least two more characters. */
2018
2019 next->text[ptr++] = '\n';
2020 message_size++;
2021
2022 /* A blank line signals the end of the headers; release the unwanted
2023 space and set next to NULL to indicate this. */
2024
2025 if (ptr == 1)
2026 {
2027 reset_point = store_reset(reset_point);
2028 next = NULL;
2029 break;
2030 }
2031
2032 /* There is data in the line; see if the next input character is a
2033 whitespace character. If it is, we have a continuation of this header line.
2034 There is always space for at least one character at this point. */
2035
2036 if (ch != EOF)
2037 {
2038 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
2039 if (nextch == ' ' || nextch == '\t')
2040 {
2041 next->text[ptr++] = nextch;
2042 if (++message_size >= header_maxsize)
2043 goto OVERSIZE;
2044 continue; /* Iterate the loop */
2045 }
2046 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2047 else ch = EOF; /* Cause main loop to exit at end */
2048 }
2049
2050 /* We have got to the real line end. Terminate the string and release store
2051 beyond it. If it turns out to be a real header, internal binary zeros will
2052 be squashed later. */
2053
2054 next->text[ptr] = 0;
2055 next->slen = ptr;
2056 store_release_above(next->text + ptr + 1);
2057
2058 /* Check the running total size against the overall message size limit. We
2059 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2060 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2061 headers - the code to read the body will then also hit the buffer. */
2062
2063 if (message_size > thismessage_size_limit) break;
2064
2065 /* A line that is not syntactically correct for a header also marks
2066 the end of the headers. In this case, we leave next containing the
2067 first data line. This might actually be several lines because of the
2068 continuation logic applied above, but that doesn't matter.
2069
2070 It turns out that smail, and presumably sendmail, accept leading lines
2071 of the form
2072
2073 From ph10 Fri Jan 5 12:35 GMT 1996
2074
2075 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2076 find any documentation of this, but for compatibility it had better be
2077 accepted. Exim restricts it to the case of non-smtp messages, and
2078 treats it as an alternative to the -f command line option. Thus it is
2079 ignored except for trusted users or filter testing. Otherwise it is taken
2080 as the sender address, unless -f was used (sendmail compatibility).
2081
2082 It further turns out that some UUCPs generate the From_line in a different
2083 format, e.g.
2084
2085 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2086
2087 The regex for matching these things is now capable of recognizing both
2088 formats (including 2- and 4-digit years in the latter). In fact, the regex
2089 is now configurable, as is the expansion string to fish out the sender.
2090
2091 Even further on it has been discovered that some broken clients send
2092 these lines in SMTP messages. There is now an option to ignore them from
2093 specified hosts or networks. Sigh. */
2094
2095 if ( header_last == header_list
2096 && ( !smtp_input
2097 || ( sender_host_address
2098 && verify_check_host(&ignore_fromline_hosts) == OK
2099 )
2100 || (!sender_host_address && ignore_fromline_local)
2101 )
2102 && regex_match_and_setup(regex_From, next->text, 0, -1)
2103 )
2104 {
2105 if (!f.sender_address_forced)
2106 {
2107 uschar *uucp_sender = expand_string(uucp_from_sender);
2108 if (!uucp_sender)
2109 log_write(0, LOG_MAIN|LOG_PANIC,
2110 "expansion of \"%s\" failed after matching "
2111 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2112 else
2113 {
2114 int start, end, domain;
2115 uschar *errmess;
2116 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2117 &start, &end, &domain, TRUE);
2118 if (newsender)
2119 {
2120 if (domain == 0 && newsender[0] != 0)
2121 newsender = rewrite_address_qualify(newsender, FALSE);
2122
2123 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2124 {
2125 sender_address = newsender;
2126
2127 if (f.trusted_caller || filter_test != FTEST_NONE)
2128 {
2129 authenticated_sender = NULL;
2130 originator_name = US"";
2131 f.sender_local = FALSE;
2132 }
2133
2134 if (filter_test != FTEST_NONE)
2135 printf("Sender taken from \"From \" line\n");
2136 }
2137 }
2138 }
2139 }
2140 }
2141
2142 /* Not a leading "From " line. Check to see if it is a valid header line.
2143 Header names may contain any non-control characters except space and colon,
2144 amazingly. */
2145
2146 else
2147 {
2148 uschar *p = next->text;
2149
2150 /* If not a valid header line, break from the header reading loop, leaving
2151 next != NULL, indicating that it holds the first line of the body. */
2152
2153 if (isspace(*p)) break;
2154 while (mac_isgraph(*p) && *p != ':') p++;
2155 while (isspace(*p)) p++;
2156 if (*p != ':')
2157 {
2158 body_zerocount = had_zero;
2159 break;
2160 }
2161
2162 /* We have a valid header line. If there were any binary zeroes in
2163 the line, stomp on them here. */
2164
2165 if (had_zero > 0)
2166 for (uschar * p = next->text; p < next->text + ptr; p++) if (*p == 0)
2167 *p = '?';
2168
2169 /* It is perfectly legal to have an empty continuation line
2170 at the end of a header, but it is confusing to humans
2171 looking at such messages, since it looks like a blank line.
2172 Reduce confusion by removing redundant white space at the
2173 end. We know that there is at least one printing character
2174 (the ':' tested for above) so there is no danger of running
2175 off the end. */
2176
2177 p = next->text + ptr - 2;
2178 for (;;)
2179 {
2180 while (*p == ' ' || *p == '\t') p--;
2181 if (*p != '\n') break;
2182 ptr = (p--) - next->text + 1;
2183 message_size -= next->slen - ptr;
2184 next->text[ptr] = 0;
2185 next->slen = ptr;
2186 }
2187
2188 /* Add the header to the chain */
2189
2190 next->type = htype_other;
2191 next->next = NULL;
2192 header_last->next = next;
2193 header_last = next;
2194
2195 /* Check the limit for individual line lengths. This comes after adding to
2196 the chain so that the failing line is reflected if a bounce is generated
2197 (for a local message). */
2198
2199 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2200 {
2201 log_write(0, LOG_MAIN, "overlong message header line received from "
2202 "%s (more than %d characters): message abandoned",
2203 f.sender_host_unknown ? sender_ident : sender_fullhost,
2204 header_line_maxsize);
2205
2206 if (smtp_input)
2207 {
2208 smtp_reply = US"552 A message header line is too long";
2209 receive_swallow_smtp();
2210 goto TIDYUP; /* Skip to end of function */
2211 }
2212
2213 else
2214 give_local_error(ERRMESS_VLONGHDRLINE,
2215 string_sprintf("message header line longer than %d characters "
2216 "received: message not accepted", header_line_maxsize), US"",
2217 error_rc, stdin, header_list->next);
2218 /* Does not return */
2219 }
2220
2221 /* Note if any resent- fields exist. */
2222
2223 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2224 {
2225 resents_exist = TRUE;
2226 resent_prefix = US"Resent-";
2227 }
2228 }
2229
2230 /* Reject CHUNKING messages that do not CRLF their first header line */
2231
2232 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2233 {
2234 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2235 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2236 sender_address,
2237 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2238 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2239 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2240 bdat_flush_data();
2241 smtp_reply = US"";
2242 goto TIDYUP; /* Skip to end of function */
2243 }
2244
2245 /* The line has been handled. If we have hit EOF, break out of the loop,
2246 indicating no pending data line. */
2247
2248 if (ch == EOF) { next = NULL; break; }
2249
2250 /* Set up for the next header */
2251
2252 reset_point = store_mark();
2253 header_size = 256;
2254 next = store_get(sizeof(header_line), FALSE);
2255 next->text = store_get(header_size, TRUE);
2256 ptr = 0;
2257 had_zero = 0;
2258 prevlines_length = 0;
2259 } /* Continue, starting to read the next header */
2260
2261 /* At this point, we have read all the headers into a data structure in main
2262 store. The first header is still the dummy placeholder for the Received: header
2263 we are going to generate a bit later on. If next != NULL, it contains the first
2264 data line - which terminated the headers before reaching a blank line (not the
2265 normal case). */
2266
2267 DEBUG(D_receive)
2268 {
2269 debug_printf(">>Headers received:\n");
2270 for (header_line * h = header_list->next; h; h = h->next)
2271 debug_printf("%s", h->text);
2272 debug_printf("\n");
2273 }
2274
2275 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2276 is dropped immediately after valid headers, the next thing we will see is EOF.
2277 We must test for this specially, as further down the reading of the data is
2278 skipped if already at EOF. */
2279
2280 if (smtp_input && (receive_feof)())
2281 {
2282 smtp_reply = handle_lost_connection(US" (after header)");
2283 smtp_yield = FALSE;
2284 goto TIDYUP; /* Skip to end of function */
2285 }
2286
2287 /* If this is a filter test run and no headers were read, output a warning
2288 in case there is a mistake in the test message. */
2289
2290 if (filter_test != FTEST_NONE && header_list->next == NULL)
2291 printf("Warning: no message headers read\n");
2292
2293
2294 /* Scan the headers to identify them. Some are merely marked for later
2295 processing; some are dealt with here. */
2296
2297 for (header_line * h = header_list->next; h; h = h->next)
2298 {
2299 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2300 if (is_resent) contains_resent_headers = TRUE;
2301
2302 switch (header_checkname(h, is_resent))
2303 {
2304 case htype_bcc:
2305 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2306 break;
2307
2308 case htype_cc:
2309 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2310 break;
2311
2312 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2313
2314 case htype_date:
2315 if (!resents_exist || is_resent) date_header_exists = TRUE;
2316 break;
2317
2318 /* Same comments as about Return-Path: below. */
2319
2320 case htype_delivery_date:
2321 if (delivery_date_remove) h->type = htype_old;
2322 break;
2323
2324 /* Same comments as about Return-Path: below. */
2325
2326 case htype_envelope_to:
2327 if (envelope_to_remove) h->type = htype_old;
2328 break;
2329
2330 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2331 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2332 header consists of just the login id of the user who called Exim, rewrite
2333 it with the gecos field first. Apply this rule to Resent-From: if there
2334 are resent- fields. */
2335
2336 case htype_from:
2337 h->type = htype_from;
2338 if (!resents_exist || is_resent)
2339 {
2340 from_header = h;
2341 if (!smtp_input)
2342 {
2343 int len;
2344 uschar *s = Ustrchr(h->text, ':') + 1;
2345 while (isspace(*s)) s++;
2346 len = h->slen - (s - h->text) - 1;
2347 if (Ustrlen(originator_login) == len &&
2348 strncmpic(s, originator_login, len) == 0)
2349 {
2350 uschar *name = is_resent? US"Resent-From" : US"From";
2351 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2352 originator_login, qualify_domain_sender);
2353 from_header = header_last;
2354 h->type = htype_old;
2355 DEBUG(D_receive|D_rewrite)
2356 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2357 }
2358 }
2359 }
2360 break;
2361
2362 /* Identify the Message-id: header for generating "in-reply-to" in the
2363 autoreply transport. For incoming logging, save any resent- value. In both
2364 cases, take just the first of any multiples. */
2365
2366 case htype_id:
2367 if (!msgid_header && (!resents_exist || is_resent))
2368 {
2369 msgid_header = h;
2370 h->type = htype_id;
2371 }
2372 break;
2373
2374 /* Flag all Received: headers */
2375
2376 case htype_received:
2377 h->type = htype_received;
2378 received_count++;
2379 break;
2380
2381 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2382
2383 case htype_reply_to:
2384 h->type = htype_reply_to;
2385 break;
2386
2387 /* The Return-path: header is supposed to be added to messages when
2388 they leave the SMTP system. We shouldn't receive messages that already
2389 contain Return-path. However, since Exim generates Return-path: on
2390 local delivery, resent messages may well contain it. We therefore
2391 provide an option (which defaults on) to remove any Return-path: headers
2392 on input. Removal actually means flagging as "old", which prevents the
2393 header being transmitted with the message. */
2394
2395 case htype_return_path:
2396 if (return_path_remove) h->type = htype_old;
2397
2398 /* If we are testing a mail filter file, use the value of the
2399 Return-Path: header to set up the return_path variable, which is not
2400 otherwise set. However, remove any <> that surround the address
2401 because the variable doesn't have these. */
2402
2403 if (filter_test != FTEST_NONE)
2404 {
2405 uschar *start = h->text + 12;
2406 uschar *end = start + Ustrlen(start);
2407 while (isspace(*start)) start++;
2408 while (end > start && isspace(end[-1])) end--;
2409 if (*start == '<' && end[-1] == '>')
2410 {
2411 start++;
2412 end--;
2413 }
2414 return_path = string_copyn(start, end - start);
2415 printf("Return-path taken from \"Return-path:\" header line\n");
2416 }
2417 break;
2418
2419 /* If there is a "Sender:" header and the message is locally originated,
2420 and from an untrusted caller and suppress_local_fixups is not set, or if we
2421 are in submission mode for a remote message, mark it "old" so that it will
2422 not be transmitted with the message, unless active_local_sender_retain is
2423 set. (This can only be true if active_local_from_check is false.) If there
2424 are any resent- headers in the message, apply this rule to Resent-Sender:
2425 instead of Sender:. Messages with multiple resent- header sets cannot be
2426 tidily handled. (For this reason, at least one MUA - Pine - turns old
2427 resent- headers into X-resent- headers when resending, leaving just one
2428 set.) */
2429
2430 case htype_sender:
2431 h->type = !f.active_local_sender_retain
2432 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2433 || f.submission_mode
2434 )
2435 && (!resents_exist || is_resent)
2436 ? htype_old : htype_sender;
2437 break;
2438
2439 /* Remember the Subject: header for logging. There is no Resent-Subject */
2440
2441 case htype_subject:
2442 subject_header = h;
2443 break;
2444
2445 /* "To:" gets flagged, and the existence of a recipient header is noted,
2446 whether it's resent- or not. */
2447
2448 case htype_to:
2449 h->type = htype_to;
2450 /****
2451 to_or_cc_header_exists = TRUE;
2452 ****/
2453 break;
2454 }
2455 }
2456
2457 /* Extract recipients from the headers if that is required (the -t option).
2458 Note that this is documented as being done *before* any address rewriting takes
2459 place. There are two possibilities:
2460
2461 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2462 recipients already listed are to be REMOVED from the message. Smail 3 works
2463 like this. We need to build a non-recipients tree for that list, because in
2464 subsequent processing this data is held in a tree and that's what the
2465 spool_write_header() function expects. Make sure that non-recipient addresses
2466 are fully qualified and rewritten if necessary.
2467
2468 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2469 those in the command line arguments (and it is rumoured some other MTAs do
2470 this). Therefore, there is an option to make Exim behave this way.
2471
2472 *** Notes on "Resent-" header lines ***
2473
2474 The presence of resent-headers in the message makes -t horribly ambiguous.
2475 Experiments with sendmail showed that it uses recipients for all resent-
2476 headers, totally ignoring the concept of "sets of resent- headers" as described
2477 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2478 with all the addresses in one instance of each header.
2479
2480 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2481 error for -t if there were resent- headers in the message. However, after a
2482 discussion on the mailing list, I've learned that there are MUAs that use
2483 resent- headers with -t, and also that the stuff about sets of resent- headers
2484 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2485 message with -t and resent- header lines makes sure that only *its* resent-
2486 headers are present; previous ones are often renamed as X-resent- for example.
2487
2488 Consequently, Exim has been changed so that, if any resent- header lines are
2489 present, the recipients are taken from all of the appropriate resent- lines,
2490 and not from the ordinary To:, Cc:, etc. */
2491
2492 if (extract_recip)
2493 {
2494 int rcount = 0;
2495 error_block **bnext = &bad_addresses;
2496
2497 if (extract_addresses_remove_arguments)
2498 {
2499 while (recipients_count-- > 0)
2500 {
2501 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2502 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2503 tree_add_nonrecipient(s);
2504 }
2505 recipients_list = NULL;
2506 recipients_count = recipients_list_max = 0;
2507 }
2508
2509 /* Now scan the headers */
2510
2511 for (header_line * h = header_list->next; h; h = h->next)
2512 {
2513 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2514 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2515 {
2516 uschar *s = Ustrchr(h->text, ':') + 1;
2517 while (isspace(*s)) s++;
2518
2519 f.parse_allow_group = TRUE; /* Allow address group syntax */
2520
2521 while (*s != 0)
2522 {
2523 uschar *ss = parse_find_address_end(s, FALSE);
2524 uschar *recipient, *errmess, *pp;
2525 int start, end, domain;
2526
2527 /* Check on maximum */
2528
2529 if (recipients_max > 0 && ++rcount > recipients_max)
2530 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2531 US"message rejected: ", error_rc, stdin, NULL);
2532 /* Does not return */
2533
2534 /* Make a copy of the address, and remove any internal newlines. These
2535 may be present as a result of continuations of the header line. The
2536 white space that follows the newline must not be removed - it is part
2537 of the header. */
2538
2539 pp = recipient = store_get(ss - s + 1, is_tainted(s));
2540 for (uschar * p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2541 *pp = 0;
2542
2543 #ifdef SUPPORT_I18N
2544 {
2545 BOOL b = allow_utf8_domains;
2546 allow_utf8_domains = TRUE;
2547 #endif
2548 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2549 &domain, FALSE);
2550
2551 #ifdef SUPPORT_I18N
2552 if (string_is_utf8(recipient))
2553 message_smtputf8 = TRUE;
2554 else
2555 allow_utf8_domains = b;
2556 }
2557 #endif
2558
2559 /* Keep a list of all the bad addresses so we can send a single
2560 error message at the end. However, an empty address is not an error;
2561 just ignore it. This can come from an empty group list like
2562
2563 To: Recipients of list:;
2564
2565 If there are no recipients at all, an error will occur later. */
2566
2567 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2568 {
2569 int len = Ustrlen(s);
2570 error_block *b = store_get(sizeof(error_block), FALSE);
2571 while (len > 0 && isspace(s[len-1])) len--;
2572 b->next = NULL;
2573 b->text1 = string_printing(string_copyn(s, len));
2574 b->text2 = errmess;
2575 *bnext = b;
2576 bnext = &(b->next);
2577 }
2578
2579 /* If the recipient is already in the nonrecipients tree, it must
2580 have appeared on the command line with the option extract_addresses_
2581 remove_arguments set. Do not add it to the recipients, and keep a note
2582 that this has happened, in order to give a better error if there are
2583 no recipients left. */
2584
2585 else if (recipient != NULL)
2586 {
2587 if (tree_search(tree_nonrecipients, recipient) == NULL)
2588 receive_add_recipient(recipient, -1);
2589 else
2590 extracted_ignored = TRUE;
2591 }
2592
2593 /* Move on past this address */
2594
2595 s = ss + (*ss? 1:0);
2596 while (isspace(*s)) s++;
2597 } /* Next address */
2598
2599 f.parse_allow_group = FALSE; /* Reset group syntax flags */
2600 f.parse_found_group = FALSE;
2601
2602 /* If this was the bcc: header, mark it "old", which means it
2603 will be kept on the spool, but not transmitted as part of the
2604 message. */
2605
2606 if (h->type == htype_bcc) h->type = htype_old;
2607 } /* For appropriate header line */
2608 } /* For each header line */
2609
2610 }
2611
2612 /* Now build the unique message id. This has changed several times over the
2613 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2614 Retaining all the history in the comment has become too unwieldy - read
2615 previous release sources if you want it.
2616
2617 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2618 The first part is the current time, in seconds. The second part is the current
2619 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2620 can hold a number in the range 0-3843. It used to be a computed sequence
2621 number, but is now the fractional component of the current time in units of
2622 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2623 received, Exim ensures that the timer has ticked at the appropriate level
2624 before proceeding, to avoid duplication if the pid happened to be re-used
2625 within the same time period. It seems likely that most messages will take at
2626 least half a millisecond to be received, so no delay will normally be
2627 necessary. At least for some time...
2628
2629 There is a modification when localhost_number is set. Formerly this was allowed
2630 to be as large as 255. Now it is restricted to the range 0-16, and the final
2631 component of the message id becomes (localhost_number * 200) + fractional time
2632 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2633
2634 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2635 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2636 still allows the tttttt field to hold a large enough number to last for some
2637 more decades, and the final two-digit field can hold numbers up to 1295, which
2638 is enough for milliseconds (instead of 1/2000 of a second).
2639
2640 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2641 pid, so it is probably safe because pids have to be positive. The
2642 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2643 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2644
2645 Note that string_base62() returns its data in a static storage block, so it
2646 must be copied before calling string_base62() again. It always returns exactly
2647 6 characters.
2648
2649 There doesn't seem to be anything in the RFC which requires a message id to
2650 start with a letter, but Smail was changed to ensure this. The external form of
2651 the message id (as supplied by string expansion) therefore starts with an
2652 additional leading 'E'. The spool file names do not include this leading
2653 letter and it is not used internally.
2654
2655 NOTE: If ever the format of message ids is changed, the regular expression for
2656 checking that a string is in this format must be updated in a corresponding
2657 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2658 must also be changed to reflect the correct string length. The queue-sort code
2659 needs to know the layout. Then, of course, other programs that rely on the
2660 message id format will need updating too. */
2661
2662 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2663 message_id[6] = '-';
2664 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2665
2666 /* Deal with the case where the host number is set. The value of the number was
2667 checked when it was read, to ensure it isn't too big. The timing granularity is
2668 left in id_resolution so that an appropriate wait can be done after receiving
2669 the message, if necessary (we hope it won't be). */
2670
2671 if (host_number_string)
2672 {
2673 id_resolution = BASE_62 == 62 ? 5000 : 10000;
2674 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2675 string_base62((long int)(
2676 host_number * (1000000/id_resolution) +
2677 message_id_tv.tv_usec/id_resolution)) + 4);
2678 }
2679
2680 /* Host number not set: final field is just the fractional time at an
2681 appropriate resolution. */
2682
2683 else
2684 {
2685 id_resolution = BASE_62 == 62 ? 500 : 1000;
2686 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2687 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2688 }
2689
2690 /* Add the current message id onto the current process info string if
2691 it will fit. */
2692
2693 (void)string_format(process_info + process_info_len,
2694 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2695
2696 /* If we are using multiple input directories, set up the one for this message
2697 to be the least significant base-62 digit of the time of arrival. Otherwise
2698 ensure that it is an empty string. */
2699
2700 set_subdir_str(message_subdir, message_id, 0);
2701
2702 /* Now that we have the message-id, if there is no message-id: header, generate
2703 one, but only for local (without suppress_local_fixups) or submission mode
2704 messages. This can be user-configured if required, but we had better flatten
2705 any illegal characters therein. */
2706
2707 if ( !msgid_header
2708 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2709 {
2710 uschar *id_text = US"";
2711 uschar *id_domain = primary_hostname;
2712 header_line * h;
2713
2714 /* Permit only letters, digits, dots, and hyphens in the domain */
2715
2716 if (message_id_domain)
2717 {
2718 uschar *new_id_domain = expand_string(message_id_domain);
2719 if (!new_id_domain)
2720 {
2721 if (!f.expand_string_forcedfail)
2722 log_write(0, LOG_MAIN|LOG_PANIC,
2723 "expansion of \"%s\" (message_id_header_domain) "
2724 "failed: %s", message_id_domain, expand_string_message);
2725 }
2726 else if (*new_id_domain)
2727 {
2728 id_domain = new_id_domain;
2729 for (uschar * p = id_domain; *p; p++)
2730 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2731 }
2732 }
2733
2734 /* Permit all characters except controls and RFC 2822 specials in the
2735 additional text part. */
2736
2737 if (message_id_text)
2738 {
2739 uschar *new_id_text = expand_string(message_id_text);
2740 if (!new_id_text)
2741 {
2742 if (!f.expand_string_forcedfail)
2743 log_write(0, LOG_MAIN|LOG_PANIC,
2744 "expansion of \"%s\" (message_id_header_text) "
2745 "failed: %s", message_id_text, expand_string_message);
2746 }
2747 else if (*new_id_text)
2748 {
2749 id_text = new_id_text;
2750 for (uschar * p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2751 }
2752 }
2753
2754 /* Add the header line.
2755 Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2756 appended, to preserve classical expectations of header ordering. */
2757
2758 h = header_add_at_position_internal(!resents_exist, NULL, FALSE, htype_id,
2759 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2760 *id_text == 0 ? "" : ".", id_text, id_domain);
2761
2762 /* Arrange for newly-created Message-Id to be logged */
2763
2764 if (!resents_exist)
2765 {
2766 msgid_header_newly_created = TRUE;
2767 msgid_header = h;
2768 }
2769 }
2770
2771 /* If we are to log recipients, keep a copy of the raw ones before any possible
2772 rewriting. Must copy the count, because later ACLs and the local_scan()
2773 function may mess with the real recipients. */
2774
2775 if (LOGGING(received_recipients))
2776 {
2777 raw_recipients = store_get(recipients_count * sizeof(uschar *), FALSE);
2778 for (int i = 0; i < recipients_count; i++)
2779 raw_recipients[i] = string_copy(recipients_list[i].address);
2780 raw_recipients_count = recipients_count;
2781 }
2782
2783 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2784 recipients will get here only if the conditions were right (allow_unqualified_
2785 recipient is TRUE). */
2786
2787 for (int i = 0; i < recipients_count; i++)
2788 recipients_list[i].address =
2789 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2790 global_rewrite_rules, rewrite_existflags);
2791
2792 /* If there is no From: header, generate one for local (without
2793 suppress_local_fixups) or submission_mode messages. If there is no sender
2794 address, but the sender is local or this is a local delivery error, use the
2795 originator login. This shouldn't happen for genuine bounces, but might happen
2796 for autoreplies. The addition of From: must be done *before* checking for the
2797 possible addition of a Sender: header, because untrusted_set_sender allows an
2798 untrusted user to set anything in the envelope (which might then get info
2799 From:) but we still want to ensure a valid Sender: if it is required. */
2800
2801 if ( !from_header
2802 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
2803 {
2804 uschar *oname = US"";
2805
2806 /* Use the originator_name if this is a locally submitted message and the
2807 caller is not trusted. For trusted callers, use it only if -F was used to
2808 force its value or if we have a non-SMTP message for which -f was not used
2809 to set the sender. */
2810
2811 if (!sender_host_address)
2812 {
2813 if (!f.trusted_caller || f.sender_name_forced ||
2814 (!smtp_input && !f.sender_address_forced))
2815 oname = originator_name;
2816 }
2817
2818 /* For non-locally submitted messages, the only time we use the originator
2819 name is when it was forced by the /name= option on control=submission. */
2820
2821 else if (submission_name) oname = submission_name;
2822
2823 /* Envelope sender is empty */
2824
2825 if (!*sender_address)
2826 {
2827 uschar *fromstart, *fromend;
2828
2829 fromstart = string_sprintf("%sFrom: %s%s",
2830 resent_prefix, oname, *oname ? " <" : "");
2831 fromend = *oname ? US">" : US"";
2832
2833 if (f.sender_local || f.local_error_message)
2834 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2835 local_part_quote(originator_login), qualify_domain_sender,
2836 fromend);
2837
2838 else if (f.submission_mode && authenticated_id)
2839 {
2840 if (!submission_domain)
2841 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2842 local_part_quote(authenticated_id), qualify_domain_sender,
2843 fromend);
2844
2845 else if (!*submission_domain) /* empty => whole address set */
2846 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2847 fromend);
2848
2849 else
2850 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2851 local_part_quote(authenticated_id), submission_domain, fromend);
2852
2853 from_header = header_last; /* To get it checked for Sender: */
2854 }
2855 }
2856
2857 /* There is a non-null envelope sender. Build the header using the original
2858 sender address, before any rewriting that might have been done while
2859 verifying it. */
2860
2861 else
2862 {
2863 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2864 oname,
2865 *oname ? " <" : "",
2866 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2867 *oname ? ">" : "");
2868
2869 from_header = header_last; /* To get it checked for Sender: */
2870 }
2871 }
2872
2873
2874 /* If the sender is local (without suppress_local_fixups), or if we are in
2875 submission mode and there is an authenticated_id, check that an existing From:
2876 is correct, and if not, generate a Sender: header, unless disabled. Any
2877 previously-existing Sender: header was removed above. Note that sender_local,
2878 as well as being TRUE if the caller of exim is not trusted, is also true if a
2879 trusted caller did not supply a -f argument for non-smtp input. To allow
2880 trusted callers to forge From: without supplying -f, we have to test explicitly
2881 here. If the From: header contains more than one address, then the call to
2882 parse_extract_address fails, and a Sender: header is inserted, as required. */
2883
2884 if ( from_header
2885 && ( f.active_local_from_check
2886 && ( f.sender_local && !f.trusted_caller && !f.suppress_local_fixups
2887 || f.submission_mode && authenticated_id
2888 ) ) )
2889 {
2890 BOOL make_sender = TRUE;
2891 int start, end, domain;
2892 uschar *errmess;
2893 uschar *from_address =
2894 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2895 &start, &end, &domain, FALSE);
2896 uschar *generated_sender_address;
2897
2898 generated_sender_address = f.submission_mode
2899 ? !submission_domain
2900 ? string_sprintf("%s@%s",
2901 local_part_quote(authenticated_id), qualify_domain_sender)
2902 : !*submission_domain /* empty => full address */
2903 ? string_sprintf("%s", authenticated_id)
2904 : string_sprintf("%s@%s",
2905 local_part_quote(authenticated_id), submission_domain)
2906 : string_sprintf("%s@%s",
2907 local_part_quote(originator_login), qualify_domain_sender);
2908
2909 /* Remove permitted prefixes and suffixes from the local part of the From:
2910 address before doing the comparison with the generated sender. */
2911
2912 if (from_address)
2913 {
2914 int slen;
2915 uschar *at = domain ? from_address + domain - 1 : NULL;
2916
2917 if (at) *at = 0;
2918 from_address += route_check_prefix(from_address, local_from_prefix, NULL);
2919 if ((slen = route_check_suffix(from_address, local_from_suffix, NULL)) > 0)
2920 {
2921 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2922 from_address += slen;
2923 }
2924 if (at) *at = '@';
2925
2926 if ( strcmpic(generated_sender_address, from_address) == 0
2927 || (!domain && strcmpic(from_address, originator_login) == 0))
2928 make_sender = FALSE;
2929 }
2930
2931 /* We have to cause the Sender header to be rewritten if there are
2932 appropriate rewriting rules. */
2933
2934 if (make_sender)
2935 if (f.submission_mode && !submission_name)
2936 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2937 generated_sender_address);
2938 else
2939 header_add(htype_sender, "%sSender: %s <%s>\n",
2940 resent_prefix,
2941 f.submission_mode ? submission_name : originator_name,
2942 generated_sender_address);
2943
2944 /* Ensure that a non-null envelope sender address corresponds to the
2945 submission mode sender address. */
2946
2947 if (f.submission_mode && *sender_address)
2948 {
2949 if (!sender_address_unrewritten)
2950 sender_address_unrewritten = sender_address;
2951 sender_address = generated_sender_address;
2952 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2953 log_write(L_address_rewrite, LOG_MAIN,
2954 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2955 sender_address_unrewritten, generated_sender_address);
2956 }
2957 }
2958
2959 /* If there are any rewriting rules, apply them to the sender address, unless
2960 it has already been rewritten as part of verification for SMTP input. */
2961
2962 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2963 {
2964 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2965 global_rewrite_rules, rewrite_existflags);
2966 DEBUG(D_receive|D_rewrite)
2967 debug_printf("rewritten sender = %s\n", sender_address);
2968 }
2969
2970
2971 /* The headers must be run through rewrite_header(), because it ensures that
2972 addresses are fully qualified, as well as applying any rewriting rules that may
2973 exist.
2974
2975 Qualification of header addresses in a message from a remote host happens only
2976 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2977 appropriate. For local messages, qualification always happens, unless -bnq is
2978 used to explicitly suppress it. No rewriting is done for an unqualified address
2979 that is left untouched.
2980
2981 We start at the second header, skipping our own Received:. This rewriting is
2982 documented as happening *after* recipient addresses are taken from the headers
2983 by the -t command line option. An added Sender: gets rewritten here. */
2984
2985 for (header_line * h = header_list->next; h; h = h->next)
2986 {
2987 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2988 rewrite_existflags, TRUE);
2989 if (newh) h = newh;
2990 }
2991
2992
2993 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2994 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2995 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2996 exists, this applies to the set of resent- headers rather than the normal set.
2997
2998 The requirement for a recipient header has been removed in RFC 2822. At this
2999 point in the code, earlier versions of Exim added a To: header for locally
3000 submitted messages, and an empty Bcc: header for others. In the light of the
3001 changes in RFC 2822, this was dropped in November 2003. */
3002
3003
3004 /* If there is no date header, generate one if the message originates locally
3005 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
3006 submission mode flag is set. Messages without Date: are not valid, but it seems
3007 to be more confusing if Exim adds one to all remotely-originated messages.
3008 As per Message-Id, we prepend if resending, else append.
3009 */
3010
3011 if ( !date_header_exists
3012 && ((!sender_host_address && !f.suppress_local_fixups) || f.submission_mode))
3013 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
3014 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
3015
3016 search_tidyup(); /* Free any cached resources */
3017
3018 /* Show the complete set of headers if debugging. Note that the first one (the
3019 new Received:) has not yet been set. */
3020
3021 DEBUG(D_receive)
3022 {
3023 debug_printf(">>Headers after rewriting and local additions:\n");
3024 for (header_line * h = header_list->next; h; h = h->next)
3025 debug_printf("%c %s", h->type, h->text);
3026 debug_printf("\n");
3027 }
3028
3029 /* The headers are now complete in store. If we are running in filter
3030 testing mode, that is all this function does. Return TRUE if the message
3031 ended with a dot. */
3032
3033 if (filter_test != FTEST_NONE)
3034 {
3035 process_info[process_info_len] = 0;
3036 return message_ended == END_DOT;
3037 }
3038
3039 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
3040 think more if it could be handled. Cannot do onward CHUNKING unless
3041 inbound is, but inbound chunking ought to be ok with outbound plain.
3042 Could we do onward CHUNKING given inbound CHUNKING?
3043 */
3044 if (chunking_state > CHUNKING_OFFERED)
3045 cancel_cutthrough_connection(FALSE, US"chunking active");
3046
3047 /* Cutthrough delivery:
3048 We have to create the Received header now rather than at the end of reception,
3049 so the timestamp behaviour is a change to the normal case.
3050 Having created it, send the headers to the destination. */
3051
3052 if (cutthrough.cctx.sock >= 0 && cutthrough.delivery)
3053 {
3054 if (received_count > received_headers_max)
3055 {
3056 cancel_cutthrough_connection(TRUE, US"too many headers");
3057 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3058 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3059 "Too many \"Received\" headers",
3060 sender_address,
3061 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3062 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3063 message_id[0] = 0; /* Indicate no message accepted */
3064 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3065 goto TIDYUP; /* Skip to end of function */
3066 }
3067 received_header_gen();
3068 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3069 (void) cutthrough_headers_send();
3070 }
3071
3072
3073 /* Open a new spool file for the data portion of the message. We need
3074 to access it both via a file descriptor and a stream. Try to make the
3075 directory if it isn't there. */
3076
3077 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3078 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3079
3080 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3081 {
3082 if (errno == ENOENT)
3083 {
3084 (void) directory_make(spool_directory,
3085 spool_sname(US"input", message_subdir),
3086 INPUT_DIRECTORY_MODE, TRUE);
3087 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3088 }
3089 if (data_fd < 0)
3090 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3091 spool_name, strerror(errno));
3092 }
3093
3094 /* Make sure the file's group is the Exim gid, and double-check the mode
3095 because the group setting doesn't always get set automatically. */
3096
3097 if (0 != exim_fchown(data_fd, exim_uid, exim_gid, spool_name))
3098 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3099 "Failed setting ownership on spool file %s: %s",
3100 spool_name, strerror(errno));
3101 (void)fchmod(data_fd, SPOOL_MODE);
3102
3103 /* We now have data file open. Build a stream for it and lock it. We lock only
3104 the first line of the file (containing the message ID) because otherwise there
3105 are problems when Exim is run under Cygwin (I'm told). See comments in
3106 spool_in.c, where the same locking is done. */
3107
3108 spool_data_file = fdopen(data_fd, "w+");
3109 lock_data.l_type = F_WRLCK;
3110 lock_data.l_whence = SEEK_SET;
3111 lock_data.l_start = 0;
3112 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3113
3114 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3115 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3116 errno, strerror(errno));
3117
3118 /* We have an open, locked data file. Write the message id to it to make it
3119 self-identifying. Then read the remainder of the input of this message and
3120 write it to the data file. If the variable next != NULL, it contains the first
3121 data line (which was read as a header but then turned out not to have the right
3122 format); write it (remembering that it might contain binary zeros). The result
3123 of fwrite() isn't inspected; instead we call ferror() below. */
3124
3125 fprintf(spool_data_file, "%s-D\n", message_id);
3126 if (next)
3127 {
3128 uschar *s = next->text;
3129 int len = next->slen;
3130 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3131 body_linecount++; /* Assumes only 1 line */
3132 }
3133
3134 /* Note that we might already be at end of file, or the logical end of file
3135 (indicated by '.'), or might have encountered an error while writing the
3136 message id or "next" line. */
3137
3138 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3139 {
3140 if (smtp_input)
3141 {
3142 message_ended = chunking_state <= CHUNKING_OFFERED
3143 ? read_message_data_smtp(spool_data_file)
3144 : spool_wireformat
3145 ? read_message_bdat_smtp_wire(spool_data_file)
3146 : read_message_bdat_smtp(spool_data_file);
3147 receive_linecount++; /* The terminating "." line */
3148 }
3149 else
3150 message_ended = read_message_data(spool_data_file);
3151
3152 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3153 message_linecount += body_linecount;
3154
3155 switch (message_ended)
3156 {
3157 /* Handle premature termination of SMTP */
3158
3159 case END_EOF:
3160 if (smtp_input)
3161 {
3162 Uunlink(spool_name); /* Lose data file when closed */
3163 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3164 message_id[0] = 0; /* Indicate no message accepted */
3165 smtp_reply = handle_lost_connection(US"");
3166 smtp_yield = FALSE;
3167 goto TIDYUP; /* Skip to end of function */
3168 }
3169 break;
3170
3171 /* Handle message that is too big. Don't use host_or_ident() in the log
3172 message; we want to see the ident value even for non-remote messages. */
3173
3174 case END_SIZE:
3175 Uunlink(spool_name); /* Lose the data file when closed */
3176 cancel_cutthrough_connection(TRUE, US"mail too big");
3177 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3178
3179 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3180 "message too big: read=%d max=%d",
3181 sender_address,
3182 sender_fullhost ? " H=" : "",
3183 sender_fullhost ? sender_fullhost : US"",
3184 sender_ident ? " U=" : "",
3185 sender_ident ? sender_ident : US"",
3186 message_size,
3187 thismessage_size_limit);
3188
3189 if (smtp_input)
3190 {
3191 smtp_reply = US"552 Message size exceeds maximum permitted";
3192 message_id[0] = 0; /* Indicate no message accepted */
3193 goto TIDYUP; /* Skip to end of function */
3194 }
3195 else
3196 {
3197 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3198 give_local_error(ERRMESS_TOOBIG,
3199 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3200 US"message rejected: ", error_rc, spool_data_file, header_list);
3201 /* Does not return */
3202 }
3203 break;
3204
3205 /* Handle bad BDAT protocol sequence */
3206
3207 case END_PROTOCOL:
3208 Uunlink(spool_name); /* Lose the data file when closed */
3209 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3210 smtp_reply = US""; /* Response already sent */
3211 message_id[0] = 0; /* Indicate no message accepted */
3212 goto TIDYUP; /* Skip to end of function */
3213 }
3214 }
3215
3216 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3217 example, there may be some expansion in an ACL that uses a timer.) */
3218
3219 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3220
3221 /* The message body has now been read into the data file. Call fflush() to
3222 empty the buffers in C, and then call fsync() to get the data written out onto
3223 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3224 having to do this). If there was an I/O error on either input or output,
3225 attempt to send an error message, and unlink the spool file. For non-SMTP input
3226 we can then give up. Note that for SMTP input we must swallow the remainder of
3227 the input in cases of output errors, since the far end doesn't expect to see
3228 anything until the terminating dot line is sent. */
3229
3230 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3231 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3232 {
3233 uschar *msg_errno = US strerror(errno);
3234 BOOL input_error = (receive_ferror)() != 0;
3235 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3236 input_error? "Input read" : "Spool write",
3237 msg_errno,
3238 sender_fullhost ? sender_fullhost : sender_ident);
3239
3240 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3241 Uunlink(spool_name); /* Lose the data file */
3242 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3243
3244 if (smtp_input)
3245 {
3246 if (input_error)
3247 smtp_reply = US"451 Error while reading input data";
3248 else
3249 {
3250 smtp_reply = US"451 Error while writing spool file";
3251 receive_swallow_smtp();
3252 }
3253 message_id[0] = 0; /* Indicate no message accepted */
3254 goto TIDYUP; /* Skip to end of function */
3255 }
3256
3257 else
3258 {
3259 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3260 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3261 header_list);
3262 /* Does not return */
3263 }
3264 }
3265
3266
3267 /* No I/O errors were encountered while writing the data file. */
3268
3269 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3270 if (LOGGING(receive_time)) timesince(&received_time_taken, &received_time);
3271
3272
3273 /* If there were any bad addresses extracted by -t, or there were no recipients
3274 left after -t, send a message to the sender of this message, or write it to
3275 stderr if the error handling option is set that way. Note that there may
3276 legitimately be no recipients for an SMTP message if they have all been removed
3277 by "discard".
3278
3279 We need to rewind the data file in order to read it. In the case of no
3280 recipients or stderr error writing, throw the data file away afterwards, and
3281 exit. (This can't be SMTP, which always ensures there's at least one
3282 syntactically good recipient address.) */
3283
3284 if (extract_recip && (bad_addresses || recipients_count == 0))
3285 {
3286 DEBUG(D_receive)
3287 {
3288 if (recipients_count == 0) debug_printf("*** No recipients\n");
3289 if (bad_addresses)
3290 {
3291 debug_printf("*** Bad address(es)\n");
3292 for (error_block * eblock = bad_addresses; eblock; eblock = eblock->next)
3293 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3294 }
3295 }
3296
3297 log_write(0, LOG_MAIN|LOG_PANIC, "%s %s found in headers",
3298 message_id, bad_addresses ? "bad addresses" : "no recipients");
3299
3300 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3301
3302 /* If configured to send errors to the sender, but this fails, force
3303 a failure error code. We use a special one for no recipients so that it
3304 can be detected by the autoreply transport. Otherwise error_rc is set to
3305 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3306 it is EXIT_SUCCESS. */
3307
3308 if (error_handling == ERRORS_SENDER)
3309 {
3310 if (!moan_to_sender(
3311 bad_addresses
3312 ? recipients_list ? ERRMESS_BADADDRESS : ERRMESS_BADNOADDRESS
3313 : extracted_ignored ? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS,
3314 bad_addresses, header_list, spool_data_file, FALSE
3315 ) )
3316 error_rc = bad_addresses ? EXIT_FAILURE : EXIT_NORECIPIENTS;
3317 }
3318 else
3319 {
3320 if (!bad_addresses)
3321 if (extracted_ignored)
3322 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3323 else
3324 fprintf(stderr, "exim: no recipients in message\n");
3325 else
3326 {
3327 fprintf(stderr, "exim: invalid address%s",
3328 bad_addresses->next ? "es:\n" : ":");
3329 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3330 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3331 bad_addresses->text2);
3332 }
3333 }
3334
3335 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3336 {
3337 Uunlink(spool_name);
3338 (void)fclose(spool_data_file);
3339 exim_exit(error_rc, US"receiving");
3340 }
3341 }
3342
3343 /* Data file successfully written. Generate text for the Received: header by
3344 expanding the configured string, and adding a timestamp. By leaving this
3345 operation till now, we ensure that the timestamp is the time that message
3346 reception was completed. However, this is deliberately done before calling the
3347 data ACL and local_scan().
3348
3349 This Received: header may therefore be inspected by the data ACL and by code in
3350 the local_scan() function. When they have run, we update the timestamp to be
3351 the final time of reception.
3352
3353 If there is just one recipient, set up its value in the $received_for variable
3354 for use when we generate the Received: header.
3355
3356 Note: the checking for too many Received: headers is handled by the delivery
3357 code. */
3358 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3359
3360 if (!received_header->text) /* Non-cutthrough case */
3361 {
3362 received_header_gen();
3363
3364 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3365
3366 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3367 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3368
3369 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3370 now, before running the DATA ACL. */
3371
3372 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3373 }
3374 else
3375 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3376 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3377
3378 /* If an ACL is specified for checking things at this stage of reception of a
3379 message, run it, unless all the recipients were removed by "discard" in earlier
3380 ACLs. That is the only case in which recipients_count can be zero at this
3381 stage. Set deliver_datafile to point to the data file so that $message_body and
3382 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3383 */
3384
3385 deliver_datafile = data_fd;
3386 user_msg = NULL;
3387
3388 f.enable_dollar_recipients = TRUE;
3389
3390 if (recipients_count == 0)
3391 blackholed_by = f.recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3392
3393 else
3394 {
3395 /* Handle interactive SMTP messages */
3396
3397 if (smtp_input && !smtp_batched_input)
3398 {
3399
3400 #ifndef DISABLE_DKIM
3401 if (!f.dkim_disable_verify)
3402 {
3403 /* Finish verification */
3404 dkim_exim_verify_finish();
3405
3406 /* Check if we must run the DKIM ACL */
3407 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3408 {
3409 uschar * dkim_verify_signers_expanded =
3410 expand_string(dkim_verify_signers);
3411 gstring * results = NULL;
3412 int signer_sep = 0;
3413 const uschar * ptr;
3414 uschar * item;
3415 gstring * seen_items = NULL;
3416 int old_pool = store_pool;
3417
3418 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3419
3420 if (!(ptr = dkim_verify_signers_expanded))
3421 log_write(0, LOG_MAIN|LOG_PANIC,
3422 "expansion of dkim_verify_signers option failed: %s",
3423 expand_string_message);
3424
3425 /* Default to OK when no items are present */
3426 rc = OK;
3427 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3428 {
3429 /* Prevent running ACL for an empty item */
3430 if (!item || !*item) continue;
3431
3432 /* Only run ACL once for each domain or identity,
3433 no matter how often it appears in the expanded list. */
3434 if (seen_items)
3435 {
3436 uschar * seen_item;
3437 const uschar * seen_items_list = string_from_gstring(seen_items);
3438 int seen_sep = ':';
3439 BOOL seen_this_item = FALSE;
3440
3441 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3442 NULL, 0)))
3443 if (Ustrcmp(seen_item,item) == 0)
3444 {
3445 seen_this_item = TRUE;
3446 break;
3447 }
3448
3449 if (seen_this_item)
3450 {
3451 DEBUG(D_receive)
3452 debug_printf("acl_smtp_dkim: skipping signer %s, "
3453 "already seen\n", item);
3454 continue;
3455 }
3456
3457 seen_items = string_catn(seen_items, US":", 1);
3458 }
3459 seen_items = string_cat(seen_items, item);
3460
3461 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3462 if (rc != OK)
3463 {
3464 DEBUG(D_receive)
3465 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3466 "skipping remaining items\n", rc, item);
3467 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3468 break;
3469 }
3470 }
3471 dkim_verify_status = string_from_gstring(results);
3472 store_pool = old_pool;
3473 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3474 if (rc == DISCARD)
3475 {
3476 recipients_count = 0;
3477 blackholed_by = US"DKIM ACL";
3478 if (log_msg)
3479 blackhole_log_msg = string_sprintf(": %s", log_msg);
3480 }
3481 else if (rc != OK)
3482 {
3483 Uunlink(spool_name);
3484 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3485 smtp_yield = FALSE; /* No more messages after dropped connection */
3486 smtp_reply = US""; /* Indicate reply already sent */
3487 message_id[0] = 0; /* Indicate no message accepted */
3488 goto TIDYUP; /* Skip to end of function */
3489 }
3490 }
3491 else
3492 dkim_exim_verify_log_all();
3493 }
3494 #endif /* DISABLE_DKIM */
3495
3496 #ifdef WITH_CONTENT_SCAN
3497 if ( recipients_count > 0
3498 && acl_smtp_mime
3499 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3500 )
3501 goto TIDYUP;