Content scanning: Fix locking on message spool files. Bug 2275
[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 EXPERIMENTAL_DMARC
18 # include "dmarc.h"
19 #endif /* EXPERIMENTAL_DMARC */
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 (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
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)(((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 space, inodes;
262
263 if (check_spool_space > 0 || msg_size > 0 || check_spool_inodes > 0)
264 {
265 space = receive_statvfs(TRUE, &inodes);
266
267 DEBUG(D_receive)
268 debug_printf("spool directory space = %dK inodes = %d "
269 "check_space = %dK inodes = %d msg_size = %d\n",
270 space, inodes, check_spool_space, check_spool_inodes, msg_size);
271
272 if ((space >= 0 && space < check_spool_space) ||
273 (inodes >= 0 && inodes < check_spool_inodes))
274 {
275 log_write(0, LOG_MAIN, "spool directory space check failed: space=%d "
276 "inodes=%d", space, inodes);
277 return FALSE;
278 }
279 }
280
281 if (check_log_space > 0 || check_log_inodes > 0)
282 {
283 space = receive_statvfs(FALSE, &inodes);
284
285 DEBUG(D_receive)
286 debug_printf("log directory space = %dK inodes = %d "
287 "check_space = %dK inodes = %d\n",
288 space, inodes, check_log_space, check_log_inodes);
289
290 if ((space >= 0 && space < check_log_space) ||
291 (inodes >= 0 && inodes < check_log_inodes))
292 {
293 log_write(0, LOG_MAIN, "log directory space check failed: space=%d "
294 "inodes=%d", space, inodes);
295 return FALSE;
296 }
297 }
298
299 return TRUE;
300 }
301
302
303
304 /*************************************************
305 * Bomb out while reading a message *
306 *************************************************/
307
308 /* The common case of wanting to bomb out is if a SIGTERM or SIGINT is
309 received, or if there is a timeout. A rarer case might be if the log files are
310 screwed up and Exim can't open them to record a message's arrival. Handling
311 that case is done by setting a flag to cause the log functions to call this
312 function if there is an ultimate disaster. That is why it is globally
313 accessible.
314
315 Arguments:
316 reason text reason to pass to the not-quit ACL
317 msg default SMTP response to give if in an SMTP session
318 Returns: it doesn't
319 */
320
321 void
322 receive_bomb_out(uschar *reason, uschar *msg)
323 {
324 static BOOL already_bombing_out;
325 /* The smtp_notquit_exit() below can call ACLs which can trigger recursive
326 timeouts, if someone has something slow in their quit ACL. Since the only
327 things we should be doing are to close down cleanly ASAP, on the second
328 pass we also close down stuff that might be opened again, before bypassing
329 the ACL call and exiting. */
330
331 /* If spool_name is set, it contains the name of the data file that is being
332 written. Unlink it before closing so that it cannot be picked up by a delivery
333 process. Ensure that any header file is also removed. */
334
335 if (spool_name[0] != '\0')
336 {
337 Uunlink(spool_name);
338 spool_name[Ustrlen(spool_name) - 1] = 'H';
339 Uunlink(spool_name);
340 spool_name[0] = '\0';
341 }
342
343 /* Now close the file if it is open, either as a fd or a stream. */
344
345 if (spool_data_file)
346 {
347 (void)fclose(spool_data_file);
348 spool_data_file = NULL;
349 }
350 else if (data_fd >= 0)
351 {
352 (void)close(data_fd);
353 data_fd = -1;
354 }
355
356 /* Attempt to close down an SMTP connection tidily. For non-batched SMTP, call
357 smtp_notquit_exit(), which runs the NOTQUIT ACL, if present, and handles the
358 SMTP response. */
359
360 if (!already_bombing_out)
361 {
362 already_bombing_out = TRUE;
363 if (smtp_input)
364 {
365 if (smtp_batched_input)
366 moan_smtp_batch(NULL, "421 %s - message abandoned", msg); /* No return */
367 smtp_notquit_exit(reason, US"421", US"%s %s - closing connection.",
368 smtp_active_hostname, msg);
369 }
370 }
371
372 /* Exit from the program (non-BSMTP cases) */
373
374 exim_exit(EXIT_FAILURE, NULL);
375 }
376
377
378 /*************************************************
379 * Data read timeout *
380 *************************************************/
381
382 /* Handler function for timeouts that occur while reading the data that
383 comprises a message.
384
385 Argument: the signal number
386 Returns: nothing
387 */
388
389 static void
390 data_timeout_handler(int sig)
391 {
392 had_data_timeout = sig;
393 }
394
395
396
397 #ifdef HAVE_LOCAL_SCAN
398 /*************************************************
399 * local_scan() timeout *
400 *************************************************/
401
402 /* Handler function for timeouts that occur while running a local_scan()
403 function. Posix recommends against calling longjmp() from a signal-handler,
404 but the GCC manual says you can so we will, and trust that it's better than
405 calling probably non-signal-safe funxtions during logging from within the
406 handler, even with other compilers.
407
408 See also https://cwe.mitre.org/data/definitions/745.html which also lists
409 it as unsafe.
410
411 This is all because we have no control over what might be written for a
412 local-scan function, so cannot sprinkle had-signal checks after each
413 call-site. At least with the default "do-nothing" function we won't
414 ever get here.
415
416 Argument: the signal number
417 Returns: nothing
418 */
419
420 static void
421 local_scan_timeout_handler(int sig)
422 {
423 had_local_scan_timeout = sig;
424 siglongjmp(local_scan_env, 1);
425 }
426
427
428
429 /*************************************************
430 * local_scan() crashed *
431 *************************************************/
432
433 /* Handler function for signals that occur while running a local_scan()
434 function.
435
436 Argument: the signal number
437 Returns: nothing
438 */
439
440 static void
441 local_scan_crash_handler(int sig)
442 {
443 had_local_scan_crash = sig;
444 siglongjmp(local_scan_env, 1);
445 }
446
447 #endif /*HAVE_LOCAL_SCAN*/
448
449
450 /*************************************************
451 * SIGTERM or SIGINT received *
452 *************************************************/
453
454 /* Handler for SIGTERM or SIGINT signals that occur while reading the
455 data that comprises a message.
456
457 Argument: the signal number
458 Returns: nothing
459 */
460
461 static void
462 data_sigterm_sigint_handler(int sig)
463 {
464 had_data_sigint = sig;
465 }
466
467
468
469 /*************************************************
470 * Add new recipient to list *
471 *************************************************/
472
473 /* This function builds a list of recipient addresses in argc/argv
474 format.
475
476 Arguments:
477 recipient the next address to add to recipients_list
478 pno parent number for fixed aliases; -1 otherwise
479
480 Returns: nothing
481 */
482
483 void
484 receive_add_recipient(uschar *recipient, int pno)
485 {
486 if (recipients_count >= recipients_list_max)
487 {
488 recipient_item *oldlist = recipients_list;
489 int oldmax = recipients_list_max;
490 recipients_list_max = recipients_list_max? 2*recipients_list_max : 50;
491 recipients_list = store_get(recipients_list_max * sizeof(recipient_item));
492 if (oldlist != NULL)
493 memcpy(recipients_list, oldlist, oldmax * sizeof(recipient_item));
494 }
495
496 recipients_list[recipients_count].address = recipient;
497 recipients_list[recipients_count].pno = pno;
498 #ifdef EXPERIMENTAL_BRIGHTMAIL
499 recipients_list[recipients_count].bmi_optin = bmi_current_optin;
500 /* reset optin string pointer for next recipient */
501 bmi_current_optin = NULL;
502 #endif
503 recipients_list[recipients_count].orcpt = NULL;
504 recipients_list[recipients_count].dsn_flags = 0;
505 recipients_list[recipients_count++].errors_to = NULL;
506 }
507
508
509
510
511 /*************************************************
512 * Send user response message *
513 *************************************************/
514
515 /* This function is passed a default response code and a user message. It calls
516 smtp_message_code() to check and possibly modify the response code, and then
517 calls smtp_respond() to transmit the response. I put this into a function
518 just to avoid a lot of repetition.
519
520 Arguments:
521 code the response code
522 user_msg the user message
523
524 Returns: nothing
525 */
526
527 #ifndef DISABLE_PRDR
528 static void
529 smtp_user_msg(uschar *code, uschar *user_msg)
530 {
531 int len = 3;
532 smtp_message_code(&code, &len, &user_msg, NULL, TRUE);
533 smtp_respond(code, len, TRUE, user_msg);
534 }
535 #endif
536
537
538
539
540
541 /*************************************************
542 * Remove a recipient from the list *
543 *************************************************/
544
545 /* This function is provided for local_scan() to use.
546
547 Argument:
548 recipient address to remove
549
550 Returns: TRUE if it did remove something; FALSE otherwise
551 */
552
553 BOOL
554 receive_remove_recipient(uschar *recipient)
555 {
556 int count;
557 DEBUG(D_receive) debug_printf("receive_remove_recipient(\"%s\") called\n",
558 recipient);
559 for (count = 0; count < recipients_count; count++)
560 {
561 if (Ustrcmp(recipients_list[count].address, recipient) == 0)
562 {
563 if ((--recipients_count - count) > 0)
564 memmove(recipients_list + count, recipients_list + count + 1,
565 (recipients_count - count)*sizeof(recipient_item));
566 return TRUE;
567 }
568 }
569 return FALSE;
570 }
571
572
573
574
575
576 /*************************************************
577 * Read data portion of a non-SMTP message *
578 *************************************************/
579
580 /* This function is called to read the remainder of a message (following the
581 header) when the input is not from SMTP - we are receiving a local message on
582 a standard input stream. The message is always terminated by EOF, and is also
583 terminated by a dot on a line by itself if the flag dot_ends is TRUE. Split the
584 two cases for maximum efficiency.
585
586 Ensure that the body ends with a newline. This will naturally be the case when
587 the termination is "\n.\n" but may not be otherwise. The RFC defines messages
588 as "sequences of lines" - this of course strictly applies only to SMTP, but
589 deliveries into BSD-type mailbox files also require it. Exim used to have a
590 flag for doing this at delivery time, but as it was always set for all
591 transports, I decided to simplify things by putting the check here instead.
592
593 There is at least one MUA (dtmail) that sends CRLF via this interface, and
594 other programs are known to do this as well. Exim used to have a option for
595 dealing with this: in July 2003, after much discussion, the code has been
596 changed to default to treat any of LF, CRLF, and bare CR as line terminators.
597
598 However, for the case when a dot on a line by itself terminates a message, the
599 only recognized terminating sequences before and after the dot are LF and CRLF.
600 Otherwise, having read EOL . CR, you don't know whether to read another
601 character or not.
602
603 Internally, in messages stored in Exim's spool files, LF is used as the line
604 terminator. Under the new regime, bare CRs will no longer appear in these
605 files.
606
607 Arguments:
608 fout a FILE to which to write the message
609
610 Returns: One of the END_xxx values indicating why it stopped reading
611 */
612
613 static int
614 read_message_data(FILE *fout)
615 {
616 int ch_state;
617 register int ch;
618 register int linelength = 0;
619
620 /* Handle the case when only EOF terminates the message */
621
622 if (!dot_ends)
623 {
624 register int last_ch = '\n';
625
626 for (; (ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF; last_ch = ch)
627 {
628 if (ch == 0) body_zerocount++;
629 if (last_ch == '\r' && ch != '\n')
630 {
631 if (linelength > max_received_linelength)
632 max_received_linelength = linelength;
633 linelength = 0;
634 if (fputc('\n', fout) == EOF) return END_WERROR;
635 message_size++;
636 body_linecount++;
637 }
638 if (ch == '\r') continue;
639
640 if (fputc(ch, fout) == EOF) return END_WERROR;
641 if (ch == '\n')
642 {
643 if (linelength > max_received_linelength)
644 max_received_linelength = linelength;
645 linelength = 0;
646 body_linecount++;
647 }
648 else linelength++;
649 if (++message_size > thismessage_size_limit) return END_SIZE;
650 }
651
652 if (last_ch != '\n')
653 {
654 if (linelength > max_received_linelength)
655 max_received_linelength = linelength;
656 if (fputc('\n', fout) == EOF) return END_WERROR;
657 message_size++;
658 body_linecount++;
659 }
660
661 return END_EOF;
662 }
663
664 /* Handle the case when a dot on a line on its own, or EOF, terminates. */
665
666 ch_state = 1;
667
668 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
669 {
670 if (ch == 0) body_zerocount++;
671 switch (ch_state)
672 {
673 case 0: /* Normal state (previous char written) */
674 if (ch == '\n')
675 {
676 body_linecount++;
677 if (linelength > max_received_linelength)
678 max_received_linelength = linelength;
679 linelength = -1;
680 ch_state = 1;
681 }
682 else if (ch == '\r')
683 { ch_state = 2; continue; }
684 break;
685
686 case 1: /* After written "\n" */
687 if (ch == '.') { ch_state = 3; continue; }
688 if (ch == '\r') { ch_state = 2; continue; }
689 if (ch == '\n') { body_linecount++; linelength = -1; }
690 else ch_state = 0;
691 break;
692
693 case 2:
694 body_linecount++; /* After unwritten "\r" */
695 if (linelength > max_received_linelength)
696 max_received_linelength = linelength;
697 if (ch == '\n')
698 {
699 ch_state = 1;
700 linelength = -1;
701 }
702 else
703 {
704 if (message_size++, fputc('\n', fout) == EOF) return END_WERROR;
705 if (ch == '\r') continue;
706 ch_state = 0;
707 linelength = 0;
708 }
709 break;
710
711 case 3: /* After "\n." (\n written, dot not) */
712 if (ch == '\n') return END_DOT;
713 if (ch == '\r') { ch_state = 4; continue; }
714 message_size++;
715 linelength++;
716 if (fputc('.', fout) == EOF) return END_WERROR;
717 ch_state = 0;
718 break;
719
720 case 4: /* After "\n.\r" (\n written, rest not) */
721 if (ch == '\n') return END_DOT;
722 message_size += 2;
723 body_linecount++;
724 if (fputs(".\n", fout) == EOF) return END_WERROR;
725 if (ch == '\r') { ch_state = 2; continue; }
726 ch_state = 0;
727 break;
728 }
729
730 linelength++;
731 if (fputc(ch, fout) == EOF) return END_WERROR;
732 if (++message_size > thismessage_size_limit) return END_SIZE;
733 }
734
735 /* Get here if EOF read. Unless we have just written "\n", we need to ensure
736 the message ends with a newline, and we must also write any characters that
737 were saved up while testing for an ending dot. */
738
739 if (ch_state != 1)
740 {
741 static uschar *ends[] = { US"\n", NULL, US"\n", US".\n", US".\n" };
742 if (fputs(CS ends[ch_state], fout) == EOF) return END_WERROR;
743 message_size += Ustrlen(ends[ch_state]);
744 body_linecount++;
745 }
746
747 return END_EOF;
748 }
749
750
751
752
753 /*************************************************
754 * Read data portion of an SMTP message *
755 *************************************************/
756
757 /* This function is called to read the remainder of an SMTP message (after the
758 headers), or to skip over it when an error has occurred. In this case, the
759 output file is passed as NULL.
760
761 If any line begins with a dot, that character is skipped. The input should only
762 be successfully terminated by CR LF . CR LF unless it is local (non-network)
763 SMTP, in which case the CRs are optional, but...
764
765 FUDGE: It seems that sites on the net send out messages with just LF
766 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
767 we make the CRs optional in all cases.
768
769 July 2003: Bare CRs cause trouble. We now treat them as line terminators as
770 well, so that there are no CRs in spooled messages. However, the message
771 terminating dot is not recognized between two bare CRs.
772
773 Arguments:
774 fout a FILE to which to write the message; NULL if skipping
775
776 Returns: One of the END_xxx values indicating why it stopped reading
777 */
778
779 static int
780 read_message_data_smtp(FILE *fout)
781 {
782 int ch_state = 0;
783 int ch;
784 int linelength = 0;
785
786 while ((ch = (receive_getc)(GETC_BUFFER_UNLIMITED)) != EOF)
787 {
788 if (ch == 0) body_zerocount++;
789 switch (ch_state)
790 {
791 case 0: /* After LF or CRLF */
792 if (ch == '.')
793 {
794 ch_state = 3;
795 continue; /* Don't ever write . after LF */
796 }
797 ch_state = 1;
798
799 /* Else fall through to handle as normal uschar. */
800
801 case 1: /* Normal state */
802 if (ch == '\n')
803 {
804 ch_state = 0;
805 body_linecount++;
806 if (linelength > max_received_linelength)
807 max_received_linelength = linelength;
808 linelength = -1;
809 }
810 else if (ch == '\r')
811 {
812 ch_state = 2;
813 continue;
814 }
815 break;
816
817 case 2: /* After (unwritten) CR */
818 body_linecount++;
819 if (linelength > max_received_linelength)
820 max_received_linelength = linelength;
821 linelength = -1;
822 if (ch == '\n')
823 {
824 ch_state = 0;
825 }
826 else
827 {
828 message_size++;
829 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
830 cutthrough_data_put_nl();
831 if (ch != '\r') ch_state = 1; else continue;
832 }
833 break;
834
835 case 3: /* After [CR] LF . */
836 if (ch == '\n')
837 return END_DOT;
838 if (ch == '\r')
839 {
840 ch_state = 4;
841 continue;
842 }
843 /* The dot was removed at state 3. For a doubled dot, here, reinstate
844 it to cutthrough. The current ch, dot or not, is passed both to cutthrough
845 and to file below. */
846 if (ch == '.')
847 {
848 uschar c= ch;
849 cutthrough_data_puts(&c, 1);
850 }
851 ch_state = 1;
852 break;
853
854 case 4: /* After [CR] LF . CR */
855 if (ch == '\n') return END_DOT;
856 message_size++;
857 body_linecount++;
858 if (fout != NULL && fputc('\n', fout) == EOF) return END_WERROR;
859 cutthrough_data_put_nl();
860 if (ch == '\r')
861 {
862 ch_state = 2;
863 continue;
864 }
865 ch_state = 1;
866 break;
867 }
868
869 /* Add the character to the spool file, unless skipping; then loop for the
870 next. */
871
872 message_size++;
873 linelength++;
874 if (fout)
875 {
876 if (fputc(ch, fout) == EOF) return END_WERROR;
877 if (message_size > thismessage_size_limit) return END_SIZE;
878 }
879 if(ch == '\n')
880 cutthrough_data_put_nl();
881 else
882 {
883 uschar c = ch;
884 cutthrough_data_puts(&c, 1);
885 }
886 }
887
888 /* Fall through here if EOF encountered. This indicates some kind of error,
889 since a correct message is terminated by [CR] LF . [CR] LF. */
890
891 return END_EOF;
892 }
893
894
895
896
897 /* Variant of the above read_message_data_smtp() specialised for RFC 3030
898 CHUNKING. Accept input lines separated by either CRLF or CR or LF and write
899 LF-delimited spoolfile. Until we have wireformat spoolfiles, we need the
900 body_linecount accounting for proper re-expansion for the wire, so use
901 a cut-down version of the state-machine above; we don't need to do leading-dot
902 detection and unstuffing.
903
904 Arguments:
905 fout a FILE to which to write the message; NULL if skipping;
906 must be open for both writing and reading.
907
908 Returns: One of the END_xxx values indicating why it stopped reading
909 */
910
911 static int
912 read_message_bdat_smtp(FILE *fout)
913 {
914 int linelength = 0, ch;
915 enum CH_STATE ch_state = LF_SEEN;
916 BOOL fix_nl = FALSE;
917
918 for(;;)
919 {
920 switch ((ch = bdat_getc(GETC_BUFFER_UNLIMITED)))
921 {
922 case EOF: return END_EOF;
923 case ERR: return END_PROTOCOL;
924 case EOD:
925 /* Nothing to get from the sender anymore. We check the last
926 character written to the spool.
927
928 RFC 3030 states, that BDAT chunks are normal text, terminated by CRLF.
929 If we would be strict, we would refuse such broken messages.
930 But we are liberal, so we fix it. It would be easy just to append
931 the "\n" to the spool.
932
933 But there are some more things (line counting, message size calculation and such),
934 that would need to be duplicated here. So we simply do some ungetc
935 trickery.
936 */
937 if (fout)
938 {
939 if (fseek(fout, -1, SEEK_CUR) < 0) return END_PROTOCOL;
940 if (fgetc(fout) == '\n') return END_DOT;
941 }
942
943 if (linelength == -1) /* \r already seen (see below) */
944 {
945 DEBUG(D_receive) debug_printf("Add missing LF\n");
946 bdat_ungetc('\n');
947 continue;
948 }
949 DEBUG(D_receive) debug_printf("Add missing CRLF\n");
950 bdat_ungetc('\r'); /* not even \r was seen */
951 fix_nl = TRUE;
952
953 continue;
954 case '\0': body_zerocount++; break;
955 }
956 switch (ch_state)
957 {
958 case LF_SEEN: /* After LF or CRLF */
959 ch_state = MID_LINE;
960 /* fall through to handle as normal uschar. */
961
962 case MID_LINE: /* Mid-line state */
963 if (ch == '\n')
964 {
965 ch_state = LF_SEEN;
966 body_linecount++;
967 if (linelength > max_received_linelength)
968 max_received_linelength = linelength;
969 linelength = -1;
970 }
971 else if (ch == '\r')
972 {
973 ch_state = CR_SEEN;
974 if (fix_nl) bdat_ungetc('\n');
975 continue; /* don't write CR */
976 }
977 break;
978
979 case CR_SEEN: /* After (unwritten) CR */
980 body_linecount++;
981 if (linelength > max_received_linelength)
982 max_received_linelength = linelength;
983 linelength = -1;
984 if (ch == '\n')
985 ch_state = LF_SEEN;
986 else
987 {
988 message_size++;
989 if (fout && fputc('\n', fout) == EOF) return END_WERROR;
990 cutthrough_data_put_nl();
991 if (ch == '\r') continue; /* don't write CR */
992 ch_state = MID_LINE;
993 }
994 break;
995 }
996
997 /* Add the character to the spool file, unless skipping */
998
999 message_size++;
1000 linelength++;
1001 if (fout)
1002 {
1003 if (fputc(ch, fout) == EOF) return END_WERROR;
1004 if (message_size > thismessage_size_limit) return END_SIZE;
1005 }
1006 if(ch == '\n')
1007 cutthrough_data_put_nl();
1008 else
1009 {
1010 uschar c = ch;
1011 cutthrough_data_puts(&c, 1);
1012 }
1013 }
1014 /*NOTREACHED*/
1015 }
1016
1017 static int
1018 read_message_bdat_smtp_wire(FILE *fout)
1019 {
1020 int ch;
1021
1022 /* Remember that this message uses wireformat. */
1023
1024 DEBUG(D_receive) debug_printf("CHUNKING: %s\n",
1025 fout ? "writing spoolfile in wire format" : "flushing input");
1026 spool_file_wireformat = TRUE;
1027
1028 for (;;)
1029 {
1030 if (chunking_data_left > 0)
1031 {
1032 unsigned len = MAX(chunking_data_left, thismessage_size_limit - message_size + 1);
1033 uschar * buf = bdat_getbuf(&len);
1034
1035 if (!buf) return END_EOF;
1036 message_size += len;
1037 if (fout && fwrite(buf, len, 1, fout) != 1) return END_WERROR;
1038 }
1039 else switch (ch = bdat_getc(GETC_BUFFER_UNLIMITED))
1040 {
1041 case EOF: return END_EOF;
1042 case EOD: return END_DOT;
1043 case ERR: return END_PROTOCOL;
1044
1045 default:
1046 message_size++;
1047 /*XXX not done:
1048 linelength
1049 max_received_linelength
1050 body_linecount
1051 body_zerocount
1052 */
1053 if (fout && fputc(ch, fout) == EOF) return END_WERROR;
1054 break;
1055 }
1056 if (message_size > thismessage_size_limit) return END_SIZE;
1057 }
1058 /*NOTREACHED*/
1059 }
1060
1061
1062
1063
1064 /*************************************************
1065 * Swallow SMTP message *
1066 *************************************************/
1067
1068 /* This function is called when there has been some kind of error while reading
1069 an SMTP message, and the remaining data may need to be swallowed. It is global
1070 because it is called from smtp_closedown() to shut down an incoming call
1071 tidily.
1072
1073 Argument: a FILE from which to read the message
1074 Returns: nothing
1075 */
1076
1077 void
1078 receive_swallow_smtp(void)
1079 {
1080 if (message_ended >= END_NOTENDED)
1081 message_ended = chunking_state <= CHUNKING_OFFERED
1082 ? read_message_data_smtp(NULL)
1083 : read_message_bdat_smtp_wire(NULL);
1084 }
1085
1086
1087
1088 /*************************************************
1089 * Handle lost SMTP connection *
1090 *************************************************/
1091
1092 /* This function logs connection loss incidents and generates an appropriate
1093 SMTP response.
1094
1095 Argument: additional data for the message
1096 Returns: the SMTP response
1097 */
1098
1099 static uschar *
1100 handle_lost_connection(uschar *s)
1101 {
1102 log_write(L_lost_incoming_connection | L_smtp_connection, LOG_MAIN,
1103 "%s lost while reading message data%s", smtp_get_connection_info(), s);
1104 smtp_notquit_exit(US"connection-lost", NULL, NULL);
1105 return US"421 Lost incoming connection";
1106 }
1107
1108
1109
1110
1111 /*************************************************
1112 * Handle a non-smtp reception error *
1113 *************************************************/
1114
1115 /* This function is called for various errors during the reception of non-SMTP
1116 messages. It either sends a message to the sender of the problem message, or it
1117 writes to the standard error stream.
1118
1119 Arguments:
1120 errcode code for moan_to_sender(), identifying the error
1121 text1 first message text, passed to moan_to_sender()
1122 text2 second message text, used only for stderrr
1123 error_rc code to pass to exim_exit if no problem
1124 f FILE containing body of message (may be stdin)
1125 hptr pointer to instore headers or NULL
1126
1127 Returns: calls exim_exit(), which does not return
1128 */
1129
1130 static void
1131 give_local_error(int errcode, uschar *text1, uschar *text2, int error_rc,
1132 FILE *f, header_line *hptr)
1133 {
1134 if (error_handling == ERRORS_SENDER)
1135 {
1136 error_block eblock;
1137 eblock.next = NULL;
1138 eblock.text1 = text1;
1139 eblock.text2 = US"";
1140 if (!moan_to_sender(errcode, &eblock, hptr, f, FALSE))
1141 error_rc = EXIT_FAILURE;
1142 }
1143 else
1144 fprintf(stderr, "exim: %s%s\n", text2, text1); /* Sic */
1145 (void)fclose(f);
1146 exim_exit(error_rc, US"");
1147 }
1148
1149
1150
1151 /*************************************************
1152 * Add header lines set up by ACL *
1153 *************************************************/
1154
1155 /* This function is called to add the header lines that were set up by
1156 statements in an ACL to the list of headers in memory. It is done in two stages
1157 like this, because when the ACL for RCPT is running, the other headers have not
1158 yet been received. This function is called twice; once just before running the
1159 DATA ACL, and once after. This is so that header lines added by MAIL or RCPT
1160 are visible to the DATA ACL.
1161
1162 Originally these header lines were added at the end. Now there is support for
1163 three different places: top, bottom, and after the Received: header(s). There
1164 will always be at least one Received: header, even if it is marked deleted, and
1165 even if something else has been put in front of it.
1166
1167 Arguments:
1168 acl_name text to identify which ACL
1169
1170 Returns: nothing
1171 */
1172
1173 static void
1174 add_acl_headers(int where, uschar *acl_name)
1175 {
1176 header_line *h, *next;
1177 header_line *last_received = NULL;
1178
1179 switch(where)
1180 {
1181 case ACL_WHERE_DKIM:
1182 case ACL_WHERE_MIME:
1183 case ACL_WHERE_DATA:
1184 if ( cutthrough.fd >= 0 && cutthrough.delivery
1185 && (acl_removed_headers || acl_added_headers))
1186 {
1187 log_write(0, LOG_MAIN|LOG_PANIC, "Header modification in data ACLs"
1188 " will not take effect on cutthrough deliveries");
1189 return;
1190 }
1191 }
1192
1193 if (acl_removed_headers)
1194 {
1195 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers removed by %s ACL:\n", acl_name);
1196
1197 for (h = header_list; h; h = h->next) if (h->type != htype_old)
1198 {
1199 const uschar * list = acl_removed_headers;
1200 int sep = ':'; /* This is specified as a colon-separated list */
1201 uschar *s;
1202 uschar buffer[128];
1203
1204 while ((s = string_nextinlist(&list, &sep, buffer, sizeof(buffer))))
1205 if (header_testname(h, s, Ustrlen(s), FALSE))
1206 {
1207 h->type = htype_old;
1208 DEBUG(D_receive|D_acl) debug_printf_indent(" %s", h->text);
1209 }
1210 }
1211 acl_removed_headers = NULL;
1212 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1213 }
1214
1215 if (!acl_added_headers) return;
1216 DEBUG(D_receive|D_acl) debug_printf_indent(">>Headers added by %s ACL:\n", acl_name);
1217
1218 for (h = acl_added_headers; h; h = next)
1219 {
1220 next = h->next;
1221
1222 switch(h->type)
1223 {
1224 case htype_add_top:
1225 h->next = header_list;
1226 header_list = h;
1227 DEBUG(D_receive|D_acl) debug_printf_indent(" (at top)");
1228 break;
1229
1230 case htype_add_rec:
1231 if (!last_received)
1232 {
1233 last_received = header_list;
1234 while (!header_testname(last_received, US"Received", 8, FALSE))
1235 last_received = last_received->next;
1236 while (last_received->next &&
1237 header_testname(last_received->next, US"Received", 8, FALSE))
1238 last_received = last_received->next;
1239 }
1240 h->next = last_received->next;
1241 last_received->next = h;
1242 DEBUG(D_receive|D_acl) debug_printf_indent(" (after Received:)");
1243 break;
1244
1245 case htype_add_rfc:
1246 /* add header before any header which is NOT Received: or Resent- */
1247 last_received = header_list;
1248 while ( last_received->next &&
1249 ( (header_testname(last_received->next, US"Received", 8, FALSE)) ||
1250 (header_testname_incomplete(last_received->next, US"Resent-", 7, FALSE)) ) )
1251 last_received = last_received->next;
1252 /* last_received now points to the last Received: or Resent-* header
1253 in an uninterrupted chain of those header types (seen from the beginning
1254 of all headers. Our current header must follow it. */
1255 h->next = last_received->next;
1256 last_received->next = h;
1257 DEBUG(D_receive|D_acl) debug_printf_indent(" (before any non-Received: or Resent-*: header)");
1258 break;
1259
1260 default:
1261 h->next = NULL;
1262 header_last->next = h;
1263 DEBUG(D_receive|D_acl) debug_printf_indent(" ");
1264 break;
1265 }
1266
1267 if (!h->next) header_last = h;
1268
1269 /* Check for one of the known header types (From:, To:, etc.) though in
1270 practice most added headers are going to be "other". Lower case
1271 identification letters are never stored with the header; they are used
1272 for existence tests when messages are received. So discard any lower case
1273 flag values. */
1274
1275 h->type = header_checkname(h, FALSE);
1276 if (h->type >= 'a') h->type = htype_other;
1277
1278 DEBUG(D_receive|D_acl) debug_printf("%s", h->text);
1279 }
1280
1281 acl_added_headers = NULL;
1282 DEBUG(D_receive|D_acl) debug_printf_indent(">>\n");
1283 }
1284
1285
1286
1287 /*************************************************
1288 * Add host information for log line *
1289 *************************************************/
1290
1291 /* Called for acceptance and rejecting log lines. This adds information about
1292 the calling host to a string that is being built dynamically.
1293
1294 Arguments:
1295 s the dynamic string
1296
1297 Returns: the extended string
1298 */
1299
1300 static gstring *
1301 add_host_info_for_log(gstring * g)
1302 {
1303 if (sender_fullhost)
1304 {
1305 if (LOGGING(dnssec) && sender_host_dnssec) /*XXX sender_helo_dnssec? */
1306 g = string_catn(g, US" DS", 3);
1307 g = string_append(g, 2, US" H=", sender_fullhost);
1308 if (LOGGING(incoming_interface) && interface_address != NULL)
1309 {
1310 g = string_cat(g,
1311 string_sprintf(" I=[%s]:%d", interface_address, interface_port));
1312 }
1313 }
1314 if (tcp_in_fastopen && !tcp_in_fastopen_logged)
1315 {
1316 g = string_catn(g, US" TFO", 4);
1317 tcp_in_fastopen_logged = TRUE;
1318 }
1319 if (sender_ident)
1320 g = string_append(g, 2, US" U=", sender_ident);
1321 if (received_protocol)
1322 g = string_append(g, 2, US" P=", received_protocol);
1323 return g;
1324 }
1325
1326
1327
1328 #ifdef WITH_CONTENT_SCAN
1329
1330 /*************************************************
1331 * Run the MIME ACL on a message *
1332 *************************************************/
1333
1334 /* This code is in a subroutine so that it can be used for both SMTP
1335 and non-SMTP messages. It is called with a non-NULL ACL pointer.
1336
1337 Arguments:
1338 acl The ACL to run (acl_smtp_mime or acl_not_smtp_mime)
1339 smtp_yield_ptr Set FALSE to kill messages after dropped connection
1340 smtp_reply_ptr Where SMTP reply is being built
1341 blackholed_by_ptr Where "blackholed by" message is being built
1342
1343 Returns: TRUE to carry on; FALSE to abandon the message
1344 */
1345
1346 static BOOL
1347 run_mime_acl(uschar *acl, BOOL *smtp_yield_ptr, uschar **smtp_reply_ptr,
1348 uschar **blackholed_by_ptr)
1349 {
1350 FILE *mbox_file;
1351 uschar * rfc822_file_path = NULL;
1352 unsigned long mbox_size;
1353 header_line *my_headerlist;
1354 uschar *user_msg, *log_msg;
1355 int mime_part_count_buffer = -1;
1356 uschar * mbox_filename;
1357 int rc = OK;
1358
1359 /* check if it is a MIME message */
1360
1361 for (my_headerlist = header_list; my_headerlist; my_headerlist = my_headerlist->next)
1362 if ( my_headerlist->type != '*' /* skip deleted headers */
1363 && strncmpic(my_headerlist->text, US"Content-Type:", 13) == 0
1364 )
1365 {
1366 DEBUG(D_receive) debug_printf("Found Content-Type: header - executing acl_smtp_mime.\n");
1367 goto DO_MIME_ACL;
1368 }
1369
1370 DEBUG(D_receive) debug_printf("No Content-Type: header - presumably not a MIME message.\n");
1371 return TRUE;
1372
1373 DO_MIME_ACL:
1374
1375 /* make sure the eml mbox file is spooled up */
1376 if (!(mbox_file = spool_mbox(&mbox_size, NULL, &mbox_filename)))
1377 { /* error while spooling */
1378 log_write(0, LOG_MAIN|LOG_PANIC,
1379 "acl_smtp_mime: error while creating mbox spool file, message temporarily rejected.");
1380 Uunlink(spool_name);
1381 unspool_mbox();
1382 #ifdef EXPERIMENTAL_DCC
1383 dcc_ok = 0;
1384 #endif
1385 smtp_respond(US"451", 3, TRUE, US"temporary local problem");
1386 message_id[0] = 0; /* Indicate no message accepted */
1387 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1388 return FALSE; /* Indicate skip to end of receive function */
1389 }
1390
1391 mime_is_rfc822 = 0;
1392
1393 MIME_ACL_CHECK:
1394 mime_part_count = -1;
1395 rc = mime_acl_check(acl, mbox_file, NULL, &user_msg, &log_msg);
1396 (void)fclose(mbox_file);
1397
1398 if (rfc822_file_path)
1399 {
1400 mime_part_count = mime_part_count_buffer;
1401
1402 if (unlink(CS rfc822_file_path) == -1)
1403 {
1404 log_write(0, LOG_PANIC,
1405 "acl_smtp_mime: can't unlink RFC822 spool file, skipping.");
1406 goto END_MIME_ACL;
1407 }
1408 rfc822_file_path = NULL;
1409 }
1410
1411 /* check if we must check any message/rfc822 attachments */
1412 if (rc == OK)
1413 {
1414 uschar * scandir = string_copyn(mbox_filename,
1415 Ustrrchr(mbox_filename, '/') - mbox_filename);
1416 struct dirent * entry;
1417 DIR * tempdir;
1418
1419 for (tempdir = opendir(CS scandir); entry = readdir(tempdir); )
1420 if (strncmpic(US entry->d_name, US"__rfc822_", 9) == 0)
1421 {
1422 rfc822_file_path = string_sprintf("%s/%s", scandir, entry->d_name);
1423 DEBUG(D_receive)
1424 debug_printf("RFC822 attachment detected: running MIME ACL for '%s'\n",
1425 rfc822_file_path);
1426 break;
1427 }
1428 closedir(tempdir);
1429
1430 if (rfc822_file_path)
1431 {
1432 if ((mbox_file = Ufopen(rfc822_file_path, "rb")))
1433 {
1434 /* set RFC822 expansion variable */
1435 mime_is_rfc822 = 1;
1436 mime_part_count_buffer = mime_part_count;
1437 goto MIME_ACL_CHECK;
1438 }
1439 log_write(0, LOG_PANIC,
1440 "acl_smtp_mime: can't open RFC822 spool file, skipping.");
1441 unlink(CS rfc822_file_path);
1442 }
1443 }
1444
1445 END_MIME_ACL:
1446 add_acl_headers(ACL_WHERE_MIME, US"MIME");
1447 if (rc == DISCARD)
1448 {
1449 recipients_count = 0;
1450 *blackholed_by_ptr = US"MIME ACL";
1451 cancel_cutthrough_connection(TRUE, US"mime acl discard");
1452 }
1453 else if (rc != OK)
1454 {
1455 Uunlink(spool_name);
1456 cancel_cutthrough_connection(TRUE, US"mime acl not ok");
1457 unspool_mbox();
1458 #ifdef EXPERIMENTAL_DCC
1459 dcc_ok = 0;
1460 #endif
1461 if (smtp_input)
1462 {
1463 if (smtp_handle_acl_fail(ACL_WHERE_MIME, rc, user_msg, log_msg) != 0)
1464 *smtp_yield_ptr = FALSE; /* No more messages after dropped connection */
1465 *smtp_reply_ptr = US""; /* Indicate reply already sent */
1466 }
1467 message_id[0] = 0; /* Indicate no message accepted */
1468 return FALSE; /* Cause skip to end of receive function */
1469 }
1470
1471 return TRUE;
1472 }
1473
1474 #endif /* WITH_CONTENT_SCAN */
1475
1476
1477
1478 void
1479 received_header_gen(void)
1480 {
1481 uschar *received;
1482 uschar *timestamp;
1483 header_line *received_header= header_list;
1484
1485 timestamp = expand_string(US"${tod_full}");
1486 if (recipients_count == 1) received_for = recipients_list[0].address;
1487 received = expand_string(received_header_text);
1488 received_for = NULL;
1489
1490 if (!received)
1491 {
1492 if(spool_name[0] != 0)
1493 Uunlink(spool_name); /* Lose the data file */
1494 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Expansion of \"%s\" "
1495 "(received_header_text) failed: %s", string_printing(received_header_text),
1496 expand_string_message);
1497 }
1498
1499 /* The first element on the header chain is reserved for the Received header,
1500 so all we have to do is fill in the text pointer, and set the type. However, if
1501 the result of the expansion is an empty string, we leave the header marked as
1502 "old" so as to refrain from adding a Received header. */
1503
1504 if (received[0] == 0)
1505 {
1506 received_header->text = string_sprintf("Received: ; %s\n", timestamp);
1507 received_header->type = htype_old;
1508 }
1509 else
1510 {
1511 received_header->text = string_sprintf("%s; %s\n", received, timestamp);
1512 received_header->type = htype_received;
1513 }
1514
1515 received_header->slen = Ustrlen(received_header->text);
1516
1517 DEBUG(D_receive) debug_printf(">>Generated Received: header line\n%c %s",
1518 received_header->type, received_header->text);
1519 }
1520
1521
1522
1523 /*************************************************
1524 * Receive message *
1525 *************************************************/
1526
1527 /* Receive a message on the given input, and put it into a pair of spool files.
1528 Either a non-null list of recipients, or the extract flag will be true, or
1529 both. The flag sender_local is true for locally generated messages. The flag
1530 submission_mode is true if an ACL has obeyed "control = submission". The flag
1531 suppress_local_fixups is true if an ACL has obeyed "control =
1532 suppress_local_fixups" or -G was passed on the command-line.
1533 The flag smtp_input is true if the message is to be
1534 handled using SMTP conventions about termination and lines starting with dots.
1535 For non-SMTP messages, dot_ends is true for dot-terminated messages.
1536
1537 If a message was successfully read, message_id[0] will be non-zero.
1538
1539 The general actions of this function are:
1540
1541 . Read the headers of the message (if any) into a chain of store
1542 blocks.
1543
1544 . If there is a "sender:" header and the message is locally originated,
1545 throw it away, unless the caller is trusted, or unless
1546 active_local_sender_retain is set - which can only happen if
1547 active_local_from_check is false.
1548
1549 . If recipients are to be extracted from the message, build the
1550 recipients list from the headers, removing any that were on the
1551 original recipients list (unless extract_addresses_remove_arguments is
1552 false), and at the same time, remove any bcc header that may be present.
1553
1554 . Get the spool file for the data, sort out its unique name, open
1555 and lock it (but don't give it the name yet).
1556
1557 . Generate a "Message-Id" header if the message doesn't have one, for
1558 locally-originated messages.
1559
1560 . Generate a "Received" header.
1561
1562 . Ensure the recipients list is fully qualified and rewritten if necessary.
1563
1564 . If there are any rewriting rules, apply them to the sender address
1565 and also to the headers.
1566
1567 . If there is no from: header, generate one, for locally-generated messages
1568 and messages in "submission mode" only.
1569
1570 . If the sender is local, check that from: is correct, and if not, generate
1571 a Sender: header, unless message comes from a trusted caller, or this
1572 feature is disabled by active_local_from_check being false.
1573
1574 . If there is no "date" header, generate one, for locally-originated
1575 or submission mode messages only.
1576
1577 . Copy the rest of the input, or up to a terminating "." if in SMTP or
1578 dot_ends mode, to the data file. Leave it open, to hold the lock.
1579
1580 . Write the envelope and the headers to a new file.
1581
1582 . Set the name for the header file; close it.
1583
1584 . Set the name for the data file; close it.
1585
1586 Because this function can potentially be called many times in a single
1587 SMTP connection, all store should be got by store_get(), so that it will be
1588 automatically retrieved after the message is accepted.
1589
1590 FUDGE: It seems that sites on the net send out messages with just LF
1591 terminators, despite the warnings in the RFCs, and other MTAs handle this. So
1592 we make the CRs optional in all cases.
1593
1594 July 2003: Bare CRs in messages, especially in header lines, cause trouble. A
1595 new regime is now in place in which bare CRs in header lines are turned into LF
1596 followed by a space, so as not to terminate the header line.
1597
1598 February 2004: A bare LF in a header line in a message whose first line was
1599 terminated by CRLF is treated in the same way as a bare CR.
1600
1601 Arguments:
1602 extract_recip TRUE if recipients are to be extracted from the message's
1603 headers
1604
1605 Returns: TRUE there are more messages to be read (SMTP input)
1606 FALSE there are no more messages to be read (non-SMTP input
1607 or SMTP connection collapsed, or other failure)
1608
1609 When reading a message for filter testing, the returned value indicates
1610 whether the headers (which is all that is read) were terminated by '.' or
1611 not. */
1612
1613 BOOL
1614 receive_msg(BOOL extract_recip)
1615 {
1616 int i;
1617 int rc = FAIL;
1618 int msg_size = 0;
1619 int process_info_len = Ustrlen(process_info);
1620 int error_rc = error_handling == ERRORS_SENDER
1621 ? errors_sender_rc : EXIT_FAILURE;
1622 int header_size = 256;
1623 int start, end, domain;
1624 int id_resolution;
1625 int had_zero = 0;
1626 int prevlines_length = 0;
1627
1628 int ptr = 0;
1629
1630 BOOL contains_resent_headers = FALSE;
1631 BOOL extracted_ignored = FALSE;
1632 BOOL first_line_ended_crlf = TRUE_UNSET;
1633 BOOL smtp_yield = TRUE;
1634 BOOL yield = FALSE;
1635
1636 BOOL resents_exist = FALSE;
1637 uschar *resent_prefix = US"";
1638 uschar *blackholed_by = NULL;
1639 uschar *blackhole_log_msg = US"";
1640 enum {NOT_TRIED, TMP_REJ, PERM_REJ, ACCEPTED} cutthrough_done = NOT_TRIED;
1641
1642 flock_t lock_data;
1643 error_block *bad_addresses = NULL;
1644
1645 uschar *frozen_by = NULL;
1646 uschar *queued_by = NULL;
1647
1648 uschar *errmsg;
1649 gstring * g;
1650 struct stat statbuf;
1651
1652 /* Final message to give to SMTP caller, and messages from ACLs */
1653
1654 uschar *smtp_reply = NULL;
1655 uschar *user_msg, *log_msg;
1656
1657 /* Working header pointers */
1658
1659 header_line *h, *next;
1660
1661 /* Flags for noting the existence of certain headers (only one left) */
1662
1663 BOOL date_header_exists = FALSE;
1664
1665 /* Pointers to receive the addresses of headers whose contents we need. */
1666
1667 header_line *from_header = NULL;
1668 header_line *subject_header = NULL;
1669 header_line *msgid_header = NULL;
1670 header_line *received_header;
1671
1672 #ifdef EXPERIMENTAL_DMARC
1673 int dmarc_up = 0;
1674 #endif /* EXPERIMENTAL_DMARC */
1675
1676 /* Variables for use when building the Received: header. */
1677
1678 uschar *timestamp;
1679 int tslen;
1680
1681
1682 /* Release any open files that might have been cached while preparing to
1683 accept the message - e.g. by verifying addresses - because reading a message
1684 might take a fair bit of real time. */
1685
1686 search_tidyup();
1687
1688 /* Extracting the recipient list from an input file is incompatible with
1689 cutthrough delivery with the no-spool option. It shouldn't be possible
1690 to set up the combination, but just in case kill any ongoing connection. */
1691 if (extract_recip || !smtp_input)
1692 cancel_cutthrough_connection(TRUE, US"not smtp input");
1693
1694 /* Initialize the chain of headers by setting up a place-holder for Received:
1695 header. Temporarily mark it as "old", i.e. not to be used. We keep header_last
1696 pointing to the end of the chain to make adding headers simple. */
1697
1698 received_header = header_list = header_last = store_get(sizeof(header_line));
1699 header_list->next = NULL;
1700 header_list->type = htype_old;
1701 header_list->text = NULL;
1702 header_list->slen = 0;
1703
1704 /* Control block for the next header to be read. */
1705
1706 next = store_get(sizeof(header_line));
1707 next->text = store_get(header_size);
1708
1709 /* Initialize message id to be null (indicating no message read), and the
1710 header names list to be the normal list. Indicate there is no data file open
1711 yet, initialize the size and warning count, and deal with no size limit. */
1712
1713 message_id[0] = 0;
1714 spool_data_file = NULL;
1715 data_fd = -1;
1716 spool_name = US"";
1717 message_size = 0;
1718 warning_count = 0;
1719 received_count = 1; /* For the one we will add */
1720
1721 if (thismessage_size_limit <= 0) thismessage_size_limit = INT_MAX;
1722
1723 /* While reading the message, the following counts are computed. */
1724
1725 message_linecount = body_linecount = body_zerocount =
1726 max_received_linelength = 0;
1727
1728 #ifndef DISABLE_DKIM
1729 /* Call into DKIM to set up the context. In CHUNKING mode
1730 we clear the dot-stuffing flag */
1731 if (smtp_input && !smtp_batched_input && !dkim_disable_verify)
1732 dkim_exim_verify_init(chunking_state <= CHUNKING_OFFERED);
1733 #endif
1734
1735 #ifdef EXPERIMENTAL_DMARC
1736 /* initialize libopendmarc */
1737 dmarc_up = dmarc_init();
1738 #endif
1739
1740 /* Remember the time of reception. Exim uses time+pid for uniqueness of message
1741 ids, and fractions of a second are required. See the comments that precede the
1742 message id creation below. */
1743
1744 (void)gettimeofday(&message_id_tv, NULL);
1745
1746 /* For other uses of the received time we can operate with granularity of one
1747 second, and for that we use the global variable received_time. This is for
1748 things like ultimate message timeouts. */
1749
1750 received_time = message_id_tv;
1751
1752 /* If SMTP input, set the special handler for timeouts. The alarm() calls
1753 happen in the smtp_getc() function when it refills its buffer. */
1754
1755 had_data_timeout = 0;
1756 if (smtp_input)
1757 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1758
1759 /* If not SMTP input, timeout happens only if configured, and we just set a
1760 single timeout for the whole message. */
1761
1762 else if (receive_timeout > 0)
1763 {
1764 os_non_restarting_signal(SIGALRM, data_timeout_handler);
1765 alarm(receive_timeout);
1766 }
1767
1768 /* SIGTERM and SIGINT are caught always. */
1769
1770 had_data_sigint = 0;
1771 signal(SIGTERM, data_sigterm_sigint_handler);
1772 signal(SIGINT, data_sigterm_sigint_handler);
1773
1774 /* Header lines in messages are not supposed to be very long, though when
1775 unfolded, to: and cc: headers can take up a lot of store. We must also cope
1776 with the possibility of junk being thrown at us. Start by getting 256 bytes for
1777 storing the header, and extend this as necessary using string_cat().
1778
1779 To cope with total lunacies, impose an upper limit on the length of the header
1780 section of the message, as otherwise the store will fill up. We must also cope
1781 with the possibility of binary zeros in the data. Hence we cannot use fgets().
1782 Folded header lines are joined into one string, leaving the '\n' characters
1783 inside them, so that writing them out reproduces the input.
1784
1785 Loop for each character of each header; the next structure for chaining the
1786 header is set up already, with ptr the offset of the next character in
1787 next->text. */
1788
1789 for (;;)
1790 {
1791 int ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1792
1793 /* If we hit EOF on a SMTP connection, it's an error, since incoming
1794 SMTP must have a correct "." terminator. */
1795
1796 if (ch == EOF && smtp_input /* && !smtp_batched_input */)
1797 {
1798 smtp_reply = handle_lost_connection(US" (header)");
1799 smtp_yield = FALSE;
1800 goto TIDYUP; /* Skip to end of function */
1801 }
1802
1803 /* See if we are at the current header's size limit - there must be at least
1804 four bytes left. This allows for the new character plus a zero, plus two for
1805 extra insertions when we are playing games with dots and carriage returns. If
1806 we are at the limit, extend the text buffer. This could have been done
1807 automatically using string_cat() but because this is a tightish loop storing
1808 only one character at a time, we choose to do it inline. Normally
1809 store_extend() will be able to extend the block; only at the end of a big
1810 store block will a copy be needed. To handle the case of very long headers
1811 (and sometimes lunatic messages can have ones that are 100s of K long) we
1812 call store_release() for strings that have been copied - if the string is at
1813 the start of a block (and therefore the only thing in it, because we aren't
1814 doing any other gets), the block gets freed. We can only do this release if
1815 there were no allocations since the once that we want to free. */
1816
1817 if (ptr >= header_size - 4)
1818 {
1819 int oldsize = header_size;
1820 /* header_size += 256; */
1821 header_size *= 2;
1822 if (!store_extend(next->text, oldsize, header_size))
1823 next->text = store_newblock(next->text, header_size, ptr);
1824 }
1825
1826 /* Cope with receiving a binary zero. There is dispute about whether
1827 these should be allowed in RFC 822 messages. The middle view is that they
1828 should not be allowed in headers, at least. Exim takes this attitude at
1829 the moment. We can't just stomp on them here, because we don't know that
1830 this line is a header yet. Set a flag to cause scanning later. */
1831
1832 if (ch == 0) had_zero++;
1833
1834 /* Test for termination. Lines in remote SMTP are terminated by CRLF, while
1835 those from data files use just LF. Treat LF in local SMTP input as a
1836 terminator too. Treat EOF as a line terminator always. */
1837
1838 if (ch == EOF) goto EOL;
1839
1840 /* FUDGE: There are sites out there that don't send CRs before their LFs, and
1841 other MTAs accept this. We are therefore forced into this "liberalisation"
1842 too, so we accept LF as a line terminator whatever the source of the message.
1843 However, if the first line of the message ended with a CRLF, we treat a bare
1844 LF specially by inserting a white space after it to ensure that the header
1845 line is not terminated. */
1846
1847 if (ch == '\n')
1848 {
1849 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = FALSE;
1850 else if (first_line_ended_crlf) receive_ungetc(' ');
1851 goto EOL;
1852 }
1853
1854 /* This is not the end of the line. If this is SMTP input and this is
1855 the first character in the line and it is a "." character, ignore it.
1856 This implements the dot-doubling rule, though header lines starting with
1857 dots aren't exactly common. They are legal in RFC 822, though. If the
1858 following is CRLF or LF, this is the line that that terminates the
1859 entire message. We set message_ended to indicate this has happened (to
1860 prevent further reading), and break out of the loop, having freed the
1861 empty header, and set next = NULL to indicate no data line. */
1862
1863 if (ptr == 0 && ch == '.' && dot_ends)
1864 {
1865 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1866 if (ch == '\r')
1867 {
1868 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1869 if (ch != '\n')
1870 {
1871 receive_ungetc(ch);
1872 ch = '\r'; /* Revert to CR */
1873 }
1874 }
1875 if (ch == '\n')
1876 {
1877 message_ended = END_DOT;
1878 store_reset(next);
1879 next = NULL;
1880 break; /* End character-reading loop */
1881 }
1882
1883 /* For non-SMTP input, the dot at the start of the line was really a data
1884 character. What is now in ch is the following character. We guaranteed
1885 enough space for this above. */
1886
1887 if (!smtp_input)
1888 {
1889 next->text[ptr++] = '.';
1890 message_size++;
1891 }
1892 }
1893
1894 /* If CR is immediately followed by LF, end the line, ignoring the CR, and
1895 remember this case if this is the first line ending. */
1896
1897 if (ch == '\r')
1898 {
1899 ch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1900 if (ch == '\n')
1901 {
1902 if (first_line_ended_crlf == TRUE_UNSET) first_line_ended_crlf = TRUE;
1903 goto EOL;
1904 }
1905
1906 /* Otherwise, put back the character after CR, and turn the bare CR
1907 into LF SP. */
1908
1909 ch = (receive_ungetc)(ch);
1910 next->text[ptr++] = '\n';
1911 message_size++;
1912 ch = ' ';
1913 }
1914
1915 /* We have a data character for the header line. */
1916
1917 next->text[ptr++] = ch; /* Add to buffer */
1918 message_size++; /* Total message size so far */
1919
1920 /* Handle failure due to a humungously long header section. The >= allows
1921 for the terminating \n. Add what we have so far onto the headers list so
1922 that it gets reflected in any error message, and back up the just-read
1923 character. */
1924
1925 if (message_size >= header_maxsize)
1926 {
1927 next->text[ptr] = 0;
1928 next->slen = ptr;
1929 next->type = htype_other;
1930 next->next = NULL;
1931 header_last->next = next;
1932 header_last = next;
1933
1934 log_write(0, LOG_MAIN, "ridiculously long message header received from "
1935 "%s (more than %d characters): message abandoned",
1936 sender_host_unknown? sender_ident : sender_fullhost, header_maxsize);
1937
1938 if (smtp_input)
1939 {
1940 smtp_reply = US"552 Message header is ridiculously long";
1941 receive_swallow_smtp();
1942 goto TIDYUP; /* Skip to end of function */
1943 }
1944
1945 else
1946 {
1947 give_local_error(ERRMESS_VLONGHEADER,
1948 string_sprintf("message header longer than %d characters received: "
1949 "message not accepted", header_maxsize), US"", error_rc, stdin,
1950 header_list->next);
1951 /* Does not return */
1952 }
1953 }
1954
1955 continue; /* With next input character */
1956
1957 /* End of header line reached */
1958
1959 EOL:
1960
1961 /* Keep track of lines for BSMTP errors and overall message_linecount. */
1962
1963 receive_linecount++;
1964 message_linecount++;
1965
1966 /* Keep track of maximum line length */
1967
1968 if (ptr - prevlines_length > max_received_linelength)
1969 max_received_linelength = ptr - prevlines_length;
1970 prevlines_length = ptr + 1;
1971
1972 /* Now put in the terminating newline. There is always space for
1973 at least two more characters. */
1974
1975 next->text[ptr++] = '\n';
1976 message_size++;
1977
1978 /* A blank line signals the end of the headers; release the unwanted
1979 space and set next to NULL to indicate this. */
1980
1981 if (ptr == 1)
1982 {
1983 store_reset(next);
1984 next = NULL;
1985 break;
1986 }
1987
1988 /* There is data in the line; see if the next input character is a
1989 whitespace character. If it is, we have a continuation of this header line.
1990 There is always space for at least one character at this point. */
1991
1992 if (ch != EOF)
1993 {
1994 int nextch = (receive_getc)(GETC_BUFFER_UNLIMITED);
1995 if (nextch == ' ' || nextch == '\t')
1996 {
1997 next->text[ptr++] = nextch;
1998 message_size++;
1999 continue; /* Iterate the loop */
2000 }
2001 else if (nextch != EOF) (receive_ungetc)(nextch); /* For next time */
2002 else ch = EOF; /* Cause main loop to exit at end */
2003 }
2004
2005 /* We have got to the real line end. Terminate the string and release store
2006 beyond it. If it turns out to be a real header, internal binary zeros will
2007 be squashed later. */
2008
2009 next->text[ptr] = 0;
2010 next->slen = ptr;
2011 store_reset(next->text + ptr + 1);
2012
2013 /* Check the running total size against the overall message size limit. We
2014 don't expect to fail here, but if the overall limit is set less than MESSAGE_
2015 MAXSIZE and a big header is sent, we want to catch it. Just stop reading
2016 headers - the code to read the body will then also hit the buffer. */
2017
2018 if (message_size > thismessage_size_limit) break;
2019
2020 /* A line that is not syntactically correct for a header also marks
2021 the end of the headers. In this case, we leave next containing the
2022 first data line. This might actually be several lines because of the
2023 continuation logic applied above, but that doesn't matter.
2024
2025 It turns out that smail, and presumably sendmail, accept leading lines
2026 of the form
2027
2028 From ph10 Fri Jan 5 12:35 GMT 1996
2029
2030 in messages. The "mail" command on Solaris 2 sends such lines. I cannot
2031 find any documentation of this, but for compatibility it had better be
2032 accepted. Exim restricts it to the case of non-smtp messages, and
2033 treats it as an alternative to the -f command line option. Thus it is
2034 ignored except for trusted users or filter testing. Otherwise it is taken
2035 as the sender address, unless -f was used (sendmail compatibility).
2036
2037 It further turns out that some UUCPs generate the From_line in a different
2038 format, e.g.
2039
2040 From ph10 Fri, 7 Jan 97 14:00:00 GMT
2041
2042 The regex for matching these things is now capable of recognizing both
2043 formats (including 2- and 4-digit years in the latter). In fact, the regex
2044 is now configurable, as is the expansion string to fish out the sender.
2045
2046 Even further on it has been discovered that some broken clients send
2047 these lines in SMTP messages. There is now an option to ignore them from
2048 specified hosts or networks. Sigh. */
2049
2050 if ( header_last == header_list
2051 && ( !smtp_input
2052 || ( sender_host_address
2053 && verify_check_host(&ignore_fromline_hosts) == OK
2054 )
2055 || (!sender_host_address && ignore_fromline_local)
2056 )
2057 && regex_match_and_setup(regex_From, next->text, 0, -1)
2058 )
2059 {
2060 if (!sender_address_forced)
2061 {
2062 uschar *uucp_sender = expand_string(uucp_from_sender);
2063 if (!uucp_sender)
2064 log_write(0, LOG_MAIN|LOG_PANIC,
2065 "expansion of \"%s\" failed after matching "
2066 "\"From \" line: %s", uucp_from_sender, expand_string_message);
2067 else
2068 {
2069 int start, end, domain;
2070 uschar *errmess;
2071 uschar *newsender = parse_extract_address(uucp_sender, &errmess,
2072 &start, &end, &domain, TRUE);
2073 if (newsender)
2074 {
2075 if (domain == 0 && newsender[0] != 0)
2076 newsender = rewrite_address_qualify(newsender, FALSE);
2077
2078 if (filter_test != FTEST_NONE || receive_check_set_sender(newsender))
2079 {
2080 sender_address = newsender;
2081
2082 if (trusted_caller || filter_test != FTEST_NONE)
2083 {
2084 authenticated_sender = NULL;
2085 originator_name = US"";
2086 sender_local = FALSE;
2087 }
2088
2089 if (filter_test != FTEST_NONE)
2090 printf("Sender taken from \"From \" line\n");
2091 }
2092 }
2093 }
2094 }
2095 }
2096
2097 /* Not a leading "From " line. Check to see if it is a valid header line.
2098 Header names may contain any non-control characters except space and colon,
2099 amazingly. */
2100
2101 else
2102 {
2103 uschar *p = next->text;
2104
2105 /* If not a valid header line, break from the header reading loop, leaving
2106 next != NULL, indicating that it holds the first line of the body. */
2107
2108 if (isspace(*p)) break;
2109 while (mac_isgraph(*p) && *p != ':') p++;
2110 while (isspace(*p)) p++;
2111 if (*p != ':')
2112 {
2113 body_zerocount = had_zero;
2114 break;
2115 }
2116
2117 /* We have a valid header line. If there were any binary zeroes in
2118 the line, stomp on them here. */
2119
2120 if (had_zero > 0)
2121 for (p = next->text; p < next->text + ptr; p++) if (*p == 0) *p = '?';
2122
2123 /* It is perfectly legal to have an empty continuation line
2124 at the end of a header, but it is confusing to humans
2125 looking at such messages, since it looks like a blank line.
2126 Reduce confusion by removing redundant white space at the
2127 end. We know that there is at least one printing character
2128 (the ':' tested for above) so there is no danger of running
2129 off the end. */
2130
2131 p = next->text + ptr - 2;
2132 for (;;)
2133 {
2134 while (*p == ' ' || *p == '\t') p--;
2135 if (*p != '\n') break;
2136 ptr = (p--) - next->text + 1;
2137 message_size -= next->slen - ptr;
2138 next->text[ptr] = 0;
2139 next->slen = ptr;
2140 }
2141
2142 /* Add the header to the chain */
2143
2144 next->type = htype_other;
2145 next->next = NULL;
2146 header_last->next = next;
2147 header_last = next;
2148
2149 /* Check the limit for individual line lengths. This comes after adding to
2150 the chain so that the failing line is reflected if a bounce is generated
2151 (for a local message). */
2152
2153 if (header_line_maxsize > 0 && next->slen > header_line_maxsize)
2154 {
2155 log_write(0, LOG_MAIN, "overlong message header line received from "
2156 "%s (more than %d characters): message abandoned",
2157 sender_host_unknown? sender_ident : sender_fullhost,
2158 header_line_maxsize);
2159
2160 if (smtp_input)
2161 {
2162 smtp_reply = US"552 A message header line is too long";
2163 receive_swallow_smtp();
2164 goto TIDYUP; /* Skip to end of function */
2165 }
2166
2167 else
2168 give_local_error(ERRMESS_VLONGHDRLINE,
2169 string_sprintf("message header line longer than %d characters "
2170 "received: message not accepted", header_line_maxsize), US"",
2171 error_rc, stdin, header_list->next);
2172 /* Does not return */
2173 }
2174
2175 /* Note if any resent- fields exist. */
2176
2177 if (!resents_exist && strncmpic(next->text, US"resent-", 7) == 0)
2178 {
2179 resents_exist = TRUE;
2180 resent_prefix = US"Resent-";
2181 }
2182 }
2183
2184 /* Reject CHUNKING messages that do not CRLF their first header line */
2185
2186 if (!first_line_ended_crlf && chunking_state > CHUNKING_OFFERED)
2187 {
2188 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
2189 "Non-CRLF-terminated header, under CHUNKING: message abandoned",
2190 sender_address,
2191 sender_fullhost ? " H=" : "", sender_fullhost ? sender_fullhost : US"",
2192 sender_ident ? " U=" : "", sender_ident ? sender_ident : US"");
2193 smtp_printf("552 Message header not CRLF terminated\r\n", FALSE);
2194 bdat_flush_data();
2195 smtp_reply = US"";
2196 goto TIDYUP; /* Skip to end of function */
2197 }
2198
2199 /* The line has been handled. If we have hit EOF, break out of the loop,
2200 indicating no pending data line. */
2201
2202 if (ch == EOF) { next = NULL; break; }
2203
2204 /* Set up for the next header */
2205
2206 header_size = 256;
2207 next = store_get(sizeof(header_line));
2208 next->text = store_get(header_size);
2209 ptr = 0;
2210 had_zero = 0;
2211 prevlines_length = 0;
2212 } /* Continue, starting to read the next header */
2213
2214 /* At this point, we have read all the headers into a data structure in main
2215 store. The first header is still the dummy placeholder for the Received: header
2216 we are going to generate a bit later on. If next != NULL, it contains the first
2217 data line - which terminated the headers before reaching a blank line (not the
2218 normal case). */
2219
2220 DEBUG(D_receive)
2221 {
2222 debug_printf(">>Headers received:\n");
2223 for (h = header_list->next; h; h = h->next)
2224 debug_printf("%s", h->text);
2225 debug_printf("\n");
2226 }
2227
2228 /* End of file on any SMTP connection is an error. If an incoming SMTP call
2229 is dropped immediately after valid headers, the next thing we will see is EOF.
2230 We must test for this specially, as further down the reading of the data is
2231 skipped if already at EOF. */
2232
2233 if (smtp_input && (receive_feof)())
2234 {
2235 smtp_reply = handle_lost_connection(US" (after header)");
2236 smtp_yield = FALSE;
2237 goto TIDYUP; /* Skip to end of function */
2238 }
2239
2240 /* If this is a filter test run and no headers were read, output a warning
2241 in case there is a mistake in the test message. */
2242
2243 if (filter_test != FTEST_NONE && header_list->next == NULL)
2244 printf("Warning: no message headers read\n");
2245
2246
2247 /* Scan the headers to identify them. Some are merely marked for later
2248 processing; some are dealt with here. */
2249
2250 for (h = header_list->next; h; h = h->next)
2251 {
2252 BOOL is_resent = strncmpic(h->text, US"resent-", 7) == 0;
2253 if (is_resent) contains_resent_headers = TRUE;
2254
2255 switch (header_checkname(h, is_resent))
2256 {
2257 case htype_bcc:
2258 h->type = htype_bcc; /* Both Bcc: and Resent-Bcc: */
2259 break;
2260
2261 case htype_cc:
2262 h->type = htype_cc; /* Both Cc: and Resent-Cc: */
2263 break;
2264
2265 /* Record whether a Date: or Resent-Date: header exists, as appropriate. */
2266
2267 case htype_date:
2268 if (!resents_exist || is_resent) date_header_exists = TRUE;
2269 break;
2270
2271 /* Same comments as about Return-Path: below. */
2272
2273 case htype_delivery_date:
2274 if (delivery_date_remove) h->type = htype_old;
2275 break;
2276
2277 /* Same comments as about Return-Path: below. */
2278
2279 case htype_envelope_to:
2280 if (envelope_to_remove) h->type = htype_old;
2281 break;
2282
2283 /* Mark all "From:" headers so they get rewritten. Save the one that is to
2284 be used for Sender: checking. For Sendmail compatibility, if the "From:"
2285 header consists of just the login id of the user who called Exim, rewrite
2286 it with the gecos field first. Apply this rule to Resent-From: if there
2287 are resent- fields. */
2288
2289 case htype_from:
2290 h->type = htype_from;
2291 if (!resents_exist || is_resent)
2292 {
2293 from_header = h;
2294 if (!smtp_input)
2295 {
2296 int len;
2297 uschar *s = Ustrchr(h->text, ':') + 1;
2298 while (isspace(*s)) s++;
2299 len = h->slen - (s - h->text) - 1;
2300 if (Ustrlen(originator_login) == len &&
2301 strncmpic(s, originator_login, len) == 0)
2302 {
2303 uschar *name = is_resent? US"Resent-From" : US"From";
2304 header_add(htype_from, "%s: %s <%s@%s>\n", name, originator_name,
2305 originator_login, qualify_domain_sender);
2306 from_header = header_last;
2307 h->type = htype_old;
2308 DEBUG(D_receive|D_rewrite)
2309 debug_printf("rewrote \"%s:\" header using gecos\n", name);
2310 }
2311 }
2312 }
2313 break;
2314
2315 /* Identify the Message-id: header for generating "in-reply-to" in the
2316 autoreply transport. For incoming logging, save any resent- value. In both
2317 cases, take just the first of any multiples. */
2318
2319 case htype_id:
2320 if (!msgid_header && (!resents_exist || is_resent))
2321 {
2322 msgid_header = h;
2323 h->type = htype_id;
2324 }
2325 break;
2326
2327 /* Flag all Received: headers */
2328
2329 case htype_received:
2330 h->type = htype_received;
2331 received_count++;
2332 break;
2333
2334 /* "Reply-to:" is just noted (there is no resent-reply-to field) */
2335
2336 case htype_reply_to:
2337 h->type = htype_reply_to;
2338 break;
2339
2340 /* The Return-path: header is supposed to be added to messages when
2341 they leave the SMTP system. We shouldn't receive messages that already
2342 contain Return-path. However, since Exim generates Return-path: on
2343 local delivery, resent messages may well contain it. We therefore
2344 provide an option (which defaults on) to remove any Return-path: headers
2345 on input. Removal actually means flagging as "old", which prevents the
2346 header being transmitted with the message. */
2347
2348 case htype_return_path:
2349 if (return_path_remove) h->type = htype_old;
2350
2351 /* If we are testing a mail filter file, use the value of the
2352 Return-Path: header to set up the return_path variable, which is not
2353 otherwise set. However, remove any <> that surround the address
2354 because the variable doesn't have these. */
2355
2356 if (filter_test != FTEST_NONE)
2357 {
2358 uschar *start = h->text + 12;
2359 uschar *end = start + Ustrlen(start);
2360 while (isspace(*start)) start++;
2361 while (end > start && isspace(end[-1])) end--;
2362 if (*start == '<' && end[-1] == '>')
2363 {
2364 start++;
2365 end--;
2366 }
2367 return_path = string_copyn(start, end - start);
2368 printf("Return-path taken from \"Return-path:\" header line\n");
2369 }
2370 break;
2371
2372 /* If there is a "Sender:" header and the message is locally originated,
2373 and from an untrusted caller and suppress_local_fixups is not set, or if we
2374 are in submission mode for a remote message, mark it "old" so that it will
2375 not be transmitted with the message, unless active_local_sender_retain is
2376 set. (This can only be true if active_local_from_check is false.) If there
2377 are any resent- headers in the message, apply this rule to Resent-Sender:
2378 instead of Sender:. Messages with multiple resent- header sets cannot be
2379 tidily handled. (For this reason, at least one MUA - Pine - turns old
2380 resent- headers into X-resent- headers when resending, leaving just one
2381 set.) */
2382
2383 case htype_sender:
2384 h->type = !active_local_sender_retain
2385 && ( sender_local && !trusted_caller && !suppress_local_fixups
2386 || submission_mode
2387 )
2388 && (!resents_exist || is_resent)
2389 ? htype_old : htype_sender;
2390 break;
2391
2392 /* Remember the Subject: header for logging. There is no Resent-Subject */
2393
2394 case htype_subject:
2395 subject_header = h;
2396 break;
2397
2398 /* "To:" gets flagged, and the existence of a recipient header is noted,
2399 whether it's resent- or not. */
2400
2401 case htype_to:
2402 h->type = htype_to;
2403 /****
2404 to_or_cc_header_exists = TRUE;
2405 ****/
2406 break;
2407 }
2408 }
2409
2410 /* Extract recipients from the headers if that is required (the -t option).
2411 Note that this is documented as being done *before* any address rewriting takes
2412 place. There are two possibilities:
2413
2414 (1) According to sendmail documentation for Solaris, IRIX, and HP-UX, any
2415 recipients already listed are to be REMOVED from the message. Smail 3 works
2416 like this. We need to build a non-recipients tree for that list, because in
2417 subsequent processing this data is held in a tree and that's what the
2418 spool_write_header() function expects. Make sure that non-recipient addresses
2419 are fully qualified and rewritten if necessary.
2420
2421 (2) According to other sendmail documentation, -t ADDS extracted recipients to
2422 those in the command line arguments (and it is rumoured some other MTAs do
2423 this). Therefore, there is an option to make Exim behave this way.
2424
2425 *** Notes on "Resent-" header lines ***
2426
2427 The presence of resent-headers in the message makes -t horribly ambiguous.
2428 Experiments with sendmail showed that it uses recipients for all resent-
2429 headers, totally ignoring the concept of "sets of resent- headers" as described
2430 in RFC 2822 section 3.6.6. Sendmail also amalgamates them into a single set
2431 with all the addresses in one instance of each header.
2432
2433 This seems to me not to be at all sensible. Before release 4.20, Exim 4 gave an
2434 error for -t if there were resent- headers in the message. However, after a
2435 discussion on the mailing list, I've learned that there are MUAs that use
2436 resent- headers with -t, and also that the stuff about sets of resent- headers
2437 and their ordering in RFC 2822 is generally ignored. An MUA that submits a
2438 message with -t and resent- header lines makes sure that only *its* resent-
2439 headers are present; previous ones are often renamed as X-resent- for example.
2440
2441 Consequently, Exim has been changed so that, if any resent- header lines are
2442 present, the recipients are taken from all of the appropriate resent- lines,
2443 and not from the ordinary To:, Cc:, etc. */
2444
2445 if (extract_recip)
2446 {
2447 int rcount = 0;
2448 error_block **bnext = &bad_addresses;
2449
2450 if (extract_addresses_remove_arguments)
2451 {
2452 while (recipients_count-- > 0)
2453 {
2454 uschar *s = rewrite_address(recipients_list[recipients_count].address,
2455 TRUE, TRUE, global_rewrite_rules, rewrite_existflags);
2456 tree_add_nonrecipient(s);
2457 }
2458 recipients_list = NULL;
2459 recipients_count = recipients_list_max = 0;
2460 }
2461
2462 /* Now scan the headers */
2463
2464 for (h = header_list->next; h; h = h->next)
2465 {
2466 if ((h->type == htype_to || h->type == htype_cc || h->type == htype_bcc) &&
2467 (!contains_resent_headers || strncmpic(h->text, US"resent-", 7) == 0))
2468 {
2469 uschar *s = Ustrchr(h->text, ':') + 1;
2470 while (isspace(*s)) s++;
2471
2472 parse_allow_group = TRUE; /* Allow address group syntax */
2473
2474 while (*s != 0)
2475 {
2476 uschar *ss = parse_find_address_end(s, FALSE);
2477 uschar *recipient, *errmess, *p, *pp;
2478 int start, end, domain;
2479
2480 /* Check on maximum */
2481
2482 if (recipients_max > 0 && ++rcount > recipients_max)
2483 give_local_error(ERRMESS_TOOMANYRECIP, US"too many recipients",
2484 US"message rejected: ", error_rc, stdin, NULL);
2485 /* Does not return */
2486
2487 /* Make a copy of the address, and remove any internal newlines. These
2488 may be present as a result of continuations of the header line. The
2489 white space that follows the newline must not be removed - it is part
2490 of the header. */
2491
2492 pp = recipient = store_get(ss - s + 1);
2493 for (p = s; p < ss; p++) if (*p != '\n') *pp++ = *p;
2494 *pp = 0;
2495
2496 #ifdef SUPPORT_I18N
2497 {
2498 BOOL b = allow_utf8_domains;
2499 allow_utf8_domains = TRUE;
2500 #endif
2501 recipient = parse_extract_address(recipient, &errmess, &start, &end,
2502 &domain, FALSE);
2503
2504 #ifdef SUPPORT_I18N
2505 if (string_is_utf8(recipient))
2506 message_smtputf8 = TRUE;
2507 else
2508 allow_utf8_domains = b;
2509 }
2510 #endif
2511
2512 /* Keep a list of all the bad addresses so we can send a single
2513 error message at the end. However, an empty address is not an error;
2514 just ignore it. This can come from an empty group list like
2515
2516 To: Recipients of list:;
2517
2518 If there are no recipients at all, an error will occur later. */
2519
2520 if (recipient == NULL && Ustrcmp(errmess, "empty address") != 0)
2521 {
2522 int len = Ustrlen(s);
2523 error_block *b = store_get(sizeof(error_block));
2524 while (len > 0 && isspace(s[len-1])) len--;
2525 b->next = NULL;
2526 b->text1 = string_printing(string_copyn(s, len));
2527 b->text2 = errmess;
2528 *bnext = b;
2529 bnext = &(b->next);
2530 }
2531
2532 /* If the recipient is already in the nonrecipients tree, it must
2533 have appeared on the command line with the option extract_addresses_
2534 remove_arguments set. Do not add it to the recipients, and keep a note
2535 that this has happened, in order to give a better error if there are
2536 no recipients left. */
2537
2538 else if (recipient != NULL)
2539 {
2540 if (tree_search(tree_nonrecipients, recipient) == NULL)
2541 receive_add_recipient(recipient, -1);
2542 else
2543 extracted_ignored = TRUE;
2544 }
2545
2546 /* Move on past this address */
2547
2548 s = ss + (*ss? 1:0);
2549 while (isspace(*s)) s++;
2550 } /* Next address */
2551
2552 parse_allow_group = FALSE; /* Reset group syntax flags */
2553 parse_found_group = FALSE;
2554
2555 /* If this was the bcc: header, mark it "old", which means it
2556 will be kept on the spool, but not transmitted as part of the
2557 message. */
2558
2559 if (h->type == htype_bcc) h->type = htype_old;
2560 } /* For appropriate header line */
2561 } /* For each header line */
2562
2563 }
2564
2565 /* Now build the unique message id. This has changed several times over the
2566 lifetime of Exim. This description was rewritten for Exim 4.14 (February 2003).
2567 Retaining all the history in the comment has become too unwieldy - read
2568 previous release sources if you want it.
2569
2570 The message ID has 3 parts: tttttt-pppppp-ss. Each part is a number in base 62.
2571 The first part is the current time, in seconds. The second part is the current
2572 pid. Both are large enough to hold 32-bit numbers in base 62. The third part
2573 can hold a number in the range 0-3843. It used to be a computed sequence
2574 number, but is now the fractional component of the current time in units of
2575 1/2000 of a second (i.e. a value in the range 0-1999). After a message has been
2576 received, Exim ensures that the timer has ticked at the appropriate level
2577 before proceeding, to avoid duplication if the pid happened to be re-used
2578 within the same time period. It seems likely that most messages will take at
2579 least half a millisecond to be received, so no delay will normally be
2580 necessary. At least for some time...
2581
2582 There is a modification when localhost_number is set. Formerly this was allowed
2583 to be as large as 255. Now it is restricted to the range 0-16, and the final
2584 component of the message id becomes (localhost_number * 200) + fractional time
2585 in units of 1/200 of a second (i.e. a value in the range 0-3399).
2586
2587 Some not-really-Unix operating systems use case-insensitive file names (Darwin,
2588 Cygwin). For these, we have to use base 36 instead of base 62. Luckily, this
2589 still allows the tttttt field to hold a large enough number to last for some
2590 more decades, and the final two-digit field can hold numbers up to 1295, which
2591 is enough for milliseconds (instead of 1/2000 of a second).
2592
2593 However, the pppppp field cannot hold a 32-bit pid, but it can hold a 31-bit
2594 pid, so it is probably safe because pids have to be positive. The
2595 localhost_number is restricted to 0-10 for these hosts, and when it is set, the
2596 final field becomes (localhost_number * 100) + fractional time in centiseconds.
2597
2598 Note that string_base62() returns its data in a static storage block, so it
2599 must be copied before calling string_base62() again. It always returns exactly
2600 6 characters.
2601
2602 There doesn't seem to be anything in the RFC which requires a message id to
2603 start with a letter, but Smail was changed to ensure this. The external form of
2604 the message id (as supplied by string expansion) therefore starts with an
2605 additional leading 'E'. The spool file names do not include this leading
2606 letter and it is not used internally.
2607
2608 NOTE: If ever the format of message ids is changed, the regular expression for
2609 checking that a string is in this format must be updated in a corresponding
2610 way. It appears in the initializing code in exim.c. The macro MESSAGE_ID_LENGTH
2611 must also be changed to reflect the correct string length. The queue-sort code
2612 needs to know the layout. Then, of course, other programs that rely on the
2613 message id format will need updating too. */
2614
2615 Ustrncpy(message_id, string_base62((long int)(message_id_tv.tv_sec)), 6);
2616 message_id[6] = '-';
2617 Ustrncpy(message_id + 7, string_base62((long int)getpid()), 6);
2618
2619 /* Deal with the case where the host number is set. The value of the number was
2620 checked when it was read, to ensure it isn't too big. The timing granularity is
2621 left in id_resolution so that an appropriate wait can be done after receiving
2622 the message, if necessary (we hope it won't be). */
2623
2624 if (host_number_string)
2625 {
2626 id_resolution = (BASE_62 == 62)? 5000 : 10000;
2627 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2628 string_base62((long int)(
2629 host_number * (1000000/id_resolution) +
2630 message_id_tv.tv_usec/id_resolution)) + 4);
2631 }
2632
2633 /* Host number not set: final field is just the fractional time at an
2634 appropriate resolution. */
2635
2636 else
2637 {
2638 id_resolution = (BASE_62 == 62)? 500 : 1000;
2639 sprintf(CS(message_id + MESSAGE_ID_LENGTH - 3), "-%2s",
2640 string_base62((long int)(message_id_tv.tv_usec/id_resolution)) + 4);
2641 }
2642
2643 /* Add the current message id onto the current process info string if
2644 it will fit. */
2645
2646 (void)string_format(process_info + process_info_len,
2647 PROCESS_INFO_SIZE - process_info_len, " id=%s", message_id);
2648
2649 /* If we are using multiple input directories, set up the one for this message
2650 to be the least significant base-62 digit of the time of arrival. Otherwise
2651 ensure that it is an empty string. */
2652
2653 message_subdir[0] = split_spool_directory ? message_id[5] : 0;
2654
2655 /* Now that we have the message-id, if there is no message-id: header, generate
2656 one, but only for local (without suppress_local_fixups) or submission mode
2657 messages. This can be user-configured if required, but we had better flatten
2658 any illegal characters therein. */
2659
2660 if ( !msgid_header
2661 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
2662 {
2663 uschar *p;
2664 uschar *id_text = US"";
2665 uschar *id_domain = primary_hostname;
2666
2667 /* Permit only letters, digits, dots, and hyphens in the domain */
2668
2669 if (message_id_domain)
2670 {
2671 uschar *new_id_domain = expand_string(message_id_domain);
2672 if (!new_id_domain)
2673 {
2674 if (!expand_string_forcedfail)
2675 log_write(0, LOG_MAIN|LOG_PANIC,
2676 "expansion of \"%s\" (message_id_header_domain) "
2677 "failed: %s", message_id_domain, expand_string_message);
2678 }
2679 else if (*new_id_domain)
2680 {
2681 id_domain = new_id_domain;
2682 for (p = id_domain; *p; p++)
2683 if (!isalnum(*p) && *p != '.') *p = '-'; /* No need to test '-' ! */
2684 }
2685 }
2686
2687 /* Permit all characters except controls and RFC 2822 specials in the
2688 additional text part. */
2689
2690 if (message_id_text)
2691 {
2692 uschar *new_id_text = expand_string(message_id_text);
2693 if (!new_id_text)
2694 {
2695 if (!expand_string_forcedfail)
2696 log_write(0, LOG_MAIN|LOG_PANIC,
2697 "expansion of \"%s\" (message_id_header_text) "
2698 "failed: %s", message_id_text, expand_string_message);
2699 }
2700 else if (*new_id_text)
2701 {
2702 id_text = new_id_text;
2703 for (p = id_text; *p; p++) if (mac_iscntrl_or_special(*p)) *p = '-';
2704 }
2705 }
2706
2707 /* Add the header line
2708 * Resent-* headers are prepended, per RFC 5322 3.6.6. Non-Resent-* are
2709 * appended, to preserve classical expectations of header ordering. */
2710
2711 header_add_at_position(!resents_exist, NULL, FALSE, htype_id,
2712 "%sMessage-Id: <%s%s%s@%s>\n", resent_prefix, message_id_external,
2713 (*id_text == 0)? "" : ".", id_text, id_domain);
2714 }
2715
2716 /* If we are to log recipients, keep a copy of the raw ones before any possible
2717 rewriting. Must copy the count, because later ACLs and the local_scan()
2718 function may mess with the real recipients. */
2719
2720 if (LOGGING(received_recipients))
2721 {
2722 raw_recipients = store_get(recipients_count * sizeof(uschar *));
2723 for (i = 0; i < recipients_count; i++)
2724 raw_recipients[i] = string_copy(recipients_list[i].address);
2725 raw_recipients_count = recipients_count;
2726 }
2727
2728 /* Ensure the recipients list is fully qualified and rewritten. Unqualified
2729 recipients will get here only if the conditions were right (allow_unqualified_
2730 recipient is TRUE). */
2731
2732 for (i = 0; i < recipients_count; i++)
2733 recipients_list[i].address =
2734 rewrite_address(recipients_list[i].address, TRUE, TRUE,
2735 global_rewrite_rules, rewrite_existflags);
2736
2737 /* If there is no From: header, generate one for local (without
2738 suppress_local_fixups) or submission_mode messages. If there is no sender
2739 address, but the sender is local or this is a local delivery error, use the
2740 originator login. This shouldn't happen for genuine bounces, but might happen
2741 for autoreplies. The addition of From: must be done *before* checking for the
2742 possible addition of a Sender: header, because untrusted_set_sender allows an
2743 untrusted user to set anything in the envelope (which might then get info
2744 From:) but we still want to ensure a valid Sender: if it is required. */
2745
2746 if ( !from_header
2747 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
2748 {
2749 uschar *oname = US"";
2750
2751 /* Use the originator_name if this is a locally submitted message and the
2752 caller is not trusted. For trusted callers, use it only if -F was used to
2753 force its value or if we have a non-SMTP message for which -f was not used
2754 to set the sender. */
2755
2756 if (!sender_host_address)
2757 {
2758 if (!trusted_caller || sender_name_forced ||
2759 (!smtp_input && !sender_address_forced))
2760 oname = originator_name;
2761 }
2762
2763 /* For non-locally submitted messages, the only time we use the originator
2764 name is when it was forced by the /name= option on control=submission. */
2765
2766 else if (submission_name) oname = submission_name;
2767
2768 /* Envelope sender is empty */
2769
2770 if (!*sender_address)
2771 {
2772 uschar *fromstart, *fromend;
2773
2774 fromstart = string_sprintf("%sFrom: %s%s",
2775 resent_prefix, oname, *oname ? " <" : "");
2776 fromend = *oname ? US">" : US"";
2777
2778 if (sender_local || local_error_message)
2779 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2780 local_part_quote(originator_login), qualify_domain_sender,
2781 fromend);
2782
2783 else if (submission_mode && authenticated_id)
2784 {
2785 if (!submission_domain)
2786 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2787 local_part_quote(authenticated_id), qualify_domain_sender,
2788 fromend);
2789
2790 else if (!*submission_domain) /* empty => whole address set */
2791 header_add(htype_from, "%s%s%s\n", fromstart, authenticated_id,
2792 fromend);
2793
2794 else
2795 header_add(htype_from, "%s%s@%s%s\n", fromstart,
2796 local_part_quote(authenticated_id), submission_domain, fromend);
2797
2798 from_header = header_last; /* To get it checked for Sender: */
2799 }
2800 }
2801
2802 /* There is a non-null envelope sender. Build the header using the original
2803 sender address, before any rewriting that might have been done while
2804 verifying it. */
2805
2806 else
2807 {
2808 header_add(htype_from, "%sFrom: %s%s%s%s\n", resent_prefix,
2809 oname,
2810 *oname ? " <" : "",
2811 sender_address_unrewritten ? sender_address_unrewritten : sender_address,
2812 *oname ? ">" : "");
2813
2814 from_header = header_last; /* To get it checked for Sender: */
2815 }
2816 }
2817
2818
2819 /* If the sender is local (without suppress_local_fixups), or if we are in
2820 submission mode and there is an authenticated_id, check that an existing From:
2821 is correct, and if not, generate a Sender: header, unless disabled. Any
2822 previously-existing Sender: header was removed above. Note that sender_local,
2823 as well as being TRUE if the caller of exim is not trusted, is also true if a
2824 trusted caller did not supply a -f argument for non-smtp input. To allow
2825 trusted callers to forge From: without supplying -f, we have to test explicitly
2826 here. If the From: header contains more than one address, then the call to
2827 parse_extract_address fails, and a Sender: header is inserted, as required. */
2828
2829 if ( from_header
2830 && ( active_local_from_check
2831 && ( sender_local && !trusted_caller && !suppress_local_fixups
2832 || submission_mode && authenticated_id
2833 ) ) )
2834 {
2835 BOOL make_sender = TRUE;
2836 int start, end, domain;
2837 uschar *errmess;
2838 uschar *from_address =
2839 parse_extract_address(Ustrchr(from_header->text, ':') + 1, &errmess,
2840 &start, &end, &domain, FALSE);
2841 uschar *generated_sender_address;
2842
2843 generated_sender_address = submission_mode
2844 ? !submission_domain
2845 ? string_sprintf("%s@%s",
2846 local_part_quote(authenticated_id), qualify_domain_sender)
2847 : !*submission_domain /* empty => full address */
2848 ? string_sprintf("%s", authenticated_id)
2849 : string_sprintf("%s@%s",
2850 local_part_quote(authenticated_id), submission_domain)
2851 : string_sprintf("%s@%s",
2852 local_part_quote(originator_login), qualify_domain_sender);
2853
2854 /* Remove permitted prefixes and suffixes from the local part of the From:
2855 address before doing the comparison with the generated sender. */
2856
2857 if (from_address)
2858 {
2859 int slen;
2860 uschar *at = domain ? from_address + domain - 1 : NULL;
2861
2862 if (at) *at = 0;
2863 from_address += route_check_prefix(from_address, local_from_prefix);
2864 slen = route_check_suffix(from_address, local_from_suffix);
2865 if (slen > 0)
2866 {
2867 memmove(from_address+slen, from_address, Ustrlen(from_address)-slen);
2868 from_address += slen;
2869 }
2870 if (at) *at = '@';
2871
2872 if ( strcmpic(generated_sender_address, from_address) == 0
2873 || (!domain && strcmpic(from_address, originator_login) == 0))
2874 make_sender = FALSE;
2875 }
2876
2877 /* We have to cause the Sender header to be rewritten if there are
2878 appropriate rewriting rules. */
2879
2880 if (make_sender)
2881 if (submission_mode && !submission_name)
2882 header_add(htype_sender, "%sSender: %s\n", resent_prefix,
2883 generated_sender_address);
2884 else
2885 header_add(htype_sender, "%sSender: %s <%s>\n",
2886 resent_prefix,
2887 submission_mode? submission_name : originator_name,
2888 generated_sender_address);
2889
2890 /* Ensure that a non-null envelope sender address corresponds to the
2891 submission mode sender address. */
2892
2893 if (submission_mode && *sender_address)
2894 {
2895 if (!sender_address_unrewritten)
2896 sender_address_unrewritten = sender_address;
2897 sender_address = generated_sender_address;
2898 if (Ustrcmp(sender_address_unrewritten, generated_sender_address) != 0)
2899 log_write(L_address_rewrite, LOG_MAIN,
2900 "\"%s\" from env-from rewritten as \"%s\" by submission mode",
2901 sender_address_unrewritten, generated_sender_address);
2902 }
2903 }
2904
2905 /* If there are any rewriting rules, apply them to the sender address, unless
2906 it has already been rewritten as part of verification for SMTP input. */
2907
2908 if (global_rewrite_rules && !sender_address_unrewritten && *sender_address)
2909 {
2910 sender_address = rewrite_address(sender_address, FALSE, TRUE,
2911 global_rewrite_rules, rewrite_existflags);
2912 DEBUG(D_receive|D_rewrite)
2913 debug_printf("rewritten sender = %s\n", sender_address);
2914 }
2915
2916
2917 /* The headers must be run through rewrite_header(), because it ensures that
2918 addresses are fully qualified, as well as applying any rewriting rules that may
2919 exist.
2920
2921 Qualification of header addresses in a message from a remote host happens only
2922 if the host is in sender_unqualified_hosts or recipient_unqualified hosts, as
2923 appropriate. For local messages, qualification always happens, unless -bnq is
2924 used to explicitly suppress it. No rewriting is done for an unqualified address
2925 that is left untouched.
2926
2927 We start at the second header, skipping our own Received:. This rewriting is
2928 documented as happening *after* recipient addresses are taken from the headers
2929 by the -t command line option. An added Sender: gets rewritten here. */
2930
2931 for (h = header_list->next; h; h = h->next)
2932 {
2933 header_line *newh = rewrite_header(h, NULL, NULL, global_rewrite_rules,
2934 rewrite_existflags, TRUE);
2935 if (newh) h = newh;
2936 }
2937
2938
2939 /* An RFC 822 (sic) message is not legal unless it has at least one of "to",
2940 "cc", or "bcc". Note that although the minimal examples in RFC 822 show just
2941 "to" or "bcc", the full syntax spec allows "cc" as well. If any resent- header
2942 exists, this applies to the set of resent- headers rather than the normal set.
2943
2944 The requirement for a recipient header has been removed in RFC 2822. At this
2945 point in the code, earlier versions of Exim added a To: header for locally
2946 submitted messages, and an empty Bcc: header for others. In the light of the
2947 changes in RFC 2822, this was dropped in November 2003. */
2948
2949
2950 /* If there is no date header, generate one if the message originates locally
2951 (i.e. not over TCP/IP) and suppress_local_fixups is not set, or if the
2952 submission mode flag is set. Messages without Date: are not valid, but it seems
2953 to be more confusing if Exim adds one to all remotely-originated messages.
2954 As per Message-Id, we prepend if resending, else append.
2955 */
2956
2957 if ( !date_header_exists
2958 && ((!sender_host_address && !suppress_local_fixups) || submission_mode))
2959 header_add_at_position(!resents_exist, NULL, FALSE, htype_other,
2960 "%sDate: %s\n", resent_prefix, tod_stamp(tod_full));
2961
2962 search_tidyup(); /* Free any cached resources */
2963
2964 /* Show the complete set of headers if debugging. Note that the first one (the
2965 new Received:) has not yet been set. */
2966
2967 DEBUG(D_receive)
2968 {
2969 debug_printf(">>Headers after rewriting and local additions:\n");
2970 for (h = header_list->next; h; h = h->next)
2971 debug_printf("%c %s", h->type, h->text);
2972 debug_printf("\n");
2973 }
2974
2975 /* The headers are now complete in store. If we are running in filter
2976 testing mode, that is all this function does. Return TRUE if the message
2977 ended with a dot. */
2978
2979 if (filter_test != FTEST_NONE)
2980 {
2981 process_info[process_info_len] = 0;
2982 return message_ended == END_DOT;
2983 }
2984
2985 /*XXX CHUNKING: need to cancel cutthrough under BDAT, for now. In future,
2986 think more if it could be handled. Cannot do onward CHUNKING unless
2987 inbound is, but inbound chunking ought to be ok with outbound plain.
2988 Could we do onward CHUNKING given inbound CHUNKING?
2989 */
2990 if (chunking_state > CHUNKING_OFFERED)
2991 cancel_cutthrough_connection(FALSE, US"chunking active");
2992
2993 /* Cutthrough delivery:
2994 We have to create the Received header now rather than at the end of reception,
2995 so the timestamp behaviour is a change to the normal case.
2996 Having created it, send the headers to the destination. */
2997
2998 if (cutthrough.fd >= 0 && cutthrough.delivery)
2999 {
3000 if (received_count > received_headers_max)
3001 {
3002 cancel_cutthrough_connection(TRUE, US"too many headers");
3003 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3004 log_write(0, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3005 "Too many \"Received\" headers",
3006 sender_address,
3007 sender_fullhost ? "H=" : "", sender_fullhost ? sender_fullhost : US"",
3008 sender_ident ? "U=" : "", sender_ident ? sender_ident : US"");
3009 message_id[0] = 0; /* Indicate no message accepted */
3010 smtp_reply = US"550 Too many \"Received\" headers - suspected mail loop";
3011 goto TIDYUP; /* Skip to end of function */
3012 }
3013 received_header_gen();
3014 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3015 (void) cutthrough_headers_send();
3016 }
3017
3018
3019 /* Open a new spool file for the data portion of the message. We need
3020 to access it both via a file descriptor and a stream. Try to make the
3021 directory if it isn't there. */
3022
3023 spool_name = spool_fname(US"input", message_subdir, message_id, US"-D");
3024 DEBUG(D_receive) debug_printf("Data file name: %s\n", spool_name);
3025
3026 if ((data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE)) < 0)
3027 {
3028 if (errno == ENOENT)
3029 {
3030 (void) directory_make(spool_directory,
3031 spool_sname(US"input", message_subdir),
3032 INPUT_DIRECTORY_MODE, TRUE);
3033 data_fd = Uopen(spool_name, O_RDWR|O_CREAT|O_EXCL, SPOOL_MODE);
3034 }
3035 if (data_fd < 0)
3036 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Failed to create spool file %s: %s",
3037 spool_name, strerror(errno));
3038 }
3039
3040 /* Make sure the file's group is the Exim gid, and double-check the mode
3041 because the group setting doesn't always get set automatically. */
3042
3043 if (fchown(data_fd, exim_uid, exim_gid))
3044 log_write(0, LOG_MAIN|LOG_PANIC_DIE,
3045 "Failed setting ownership on spool file %s: %s",
3046 spool_name, strerror(errno));
3047 (void)fchmod(data_fd, SPOOL_MODE);
3048
3049 /* We now have data file open. Build a stream for it and lock it. We lock only
3050 the first line of the file (containing the message ID) because otherwise there
3051 are problems when Exim is run under Cygwin (I'm told). See comments in
3052 spool_in.c, where the same locking is done. */
3053
3054 spool_data_file = fdopen(data_fd, "w+");
3055 lock_data.l_type = F_WRLCK;
3056 lock_data.l_whence = SEEK_SET;
3057 lock_data.l_start = 0;
3058 lock_data.l_len = SPOOL_DATA_START_OFFSET;
3059
3060 if (fcntl(data_fd, F_SETLK, &lock_data) < 0)
3061 log_write(0, LOG_MAIN|LOG_PANIC_DIE, "Cannot lock %s (%d): %s", spool_name,
3062 errno, strerror(errno));
3063
3064 /* We have an open, locked data file. Write the message id to it to make it
3065 self-identifying. Then read the remainder of the input of this message and
3066 write it to the data file. If the variable next != NULL, it contains the first
3067 data line (which was read as a header but then turned out not to have the right
3068 format); write it (remembering that it might contain binary zeros). The result
3069 of fwrite() isn't inspected; instead we call ferror() below. */
3070
3071 fprintf(spool_data_file, "%s-D\n", message_id);
3072 if (next)
3073 {
3074 uschar *s = next->text;
3075 int len = next->slen;
3076 if (fwrite(s, 1, len, spool_data_file) == len) /* "if" for compiler quietening */
3077 body_linecount++; /* Assumes only 1 line */
3078 }
3079
3080 /* Note that we might already be at end of file, or the logical end of file
3081 (indicated by '.'), or might have encountered an error while writing the
3082 message id or "next" line. */
3083
3084 if (!ferror(spool_data_file) && !(receive_feof)() && message_ended != END_DOT)
3085 {
3086 if (smtp_input)
3087 {
3088 message_ended = chunking_state <= CHUNKING_OFFERED
3089 ? read_message_data_smtp(spool_data_file)
3090 : spool_wireformat
3091 ? read_message_bdat_smtp_wire(spool_data_file)
3092 : read_message_bdat_smtp(spool_data_file);
3093 receive_linecount++; /* The terminating "." line */
3094 }
3095 else
3096 message_ended = read_message_data(spool_data_file);
3097
3098 receive_linecount += body_linecount; /* For BSMTP errors mainly */
3099 message_linecount += body_linecount;
3100
3101 switch (message_ended)
3102 {
3103 /* Handle premature termination of SMTP */
3104
3105 case END_EOF:
3106 if (smtp_input)
3107 {
3108 Uunlink(spool_name); /* Lose data file when closed */
3109 cancel_cutthrough_connection(TRUE, US"sender closed connection");
3110 message_id[0] = 0; /* Indicate no message accepted */
3111 smtp_reply = handle_lost_connection(US"");
3112 smtp_yield = FALSE;
3113 goto TIDYUP; /* Skip to end of function */
3114 }
3115 break;
3116
3117 /* Handle message that is too big. Don't use host_or_ident() in the log
3118 message; we want to see the ident value even for non-remote messages. */
3119
3120 case END_SIZE:
3121 Uunlink(spool_name); /* Lose the data file when closed */
3122 cancel_cutthrough_connection(TRUE, US"mail too big");
3123 if (smtp_input) receive_swallow_smtp(); /* Swallow incoming SMTP */
3124
3125 log_write(L_size_reject, LOG_MAIN|LOG_REJECT, "rejected from <%s>%s%s%s%s: "
3126 "message too big: read=%d max=%d",
3127 sender_address,
3128 sender_fullhost ? " H=" : "",
3129 sender_fullhost ? sender_fullhost : US"",
3130 sender_ident ? " U=" : "",
3131 sender_ident ? sender_ident : US"",
3132 message_size,
3133 thismessage_size_limit);
3134
3135 if (smtp_input)
3136 {
3137 smtp_reply = US"552 Message size exceeds maximum permitted";
3138 message_id[0] = 0; /* Indicate no message accepted */
3139 goto TIDYUP; /* Skip to end of function */
3140 }
3141 else
3142 {
3143 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3144 give_local_error(ERRMESS_TOOBIG,
3145 string_sprintf("message too big (max=%d)", thismessage_size_limit),
3146 US"message rejected: ", error_rc, spool_data_file, header_list);
3147 /* Does not return */
3148 }
3149 break;
3150
3151 /* Handle bad BDAT protocol sequence */
3152
3153 case END_PROTOCOL:
3154 Uunlink(spool_name); /* Lose the data file when closed */
3155 cancel_cutthrough_connection(TRUE, US"sender protocol error");
3156 smtp_reply = US""; /* Response already sent */
3157 message_id[0] = 0; /* Indicate no message accepted */
3158 goto TIDYUP; /* Skip to end of function */
3159 }
3160 }
3161
3162 /* Restore the standard SIGALRM handler for any subsequent processing. (For
3163 example, there may be some expansion in an ACL that uses a timer.) */
3164
3165 os_non_restarting_signal(SIGALRM, sigalrm_handler);
3166
3167 /* The message body has now been read into the data file. Call fflush() to
3168 empty the buffers in C, and then call fsync() to get the data written out onto
3169 the disk, as fflush() doesn't do this (or at least, it isn't documented as
3170 having to do this). If there was an I/O error on either input or output,
3171 attempt to send an error message, and unlink the spool file. For non-SMTP input
3172 we can then give up. Note that for SMTP input we must swallow the remainder of
3173 the input in cases of output errors, since the far end doesn't expect to see
3174 anything until the terminating dot line is sent. */
3175
3176 if (fflush(spool_data_file) == EOF || ferror(spool_data_file) ||
3177 EXIMfsync(fileno(spool_data_file)) < 0 || (receive_ferror)())
3178 {
3179 uschar *msg_errno = US strerror(errno);
3180 BOOL input_error = (receive_ferror)() != 0;
3181 uschar *msg = string_sprintf("%s error (%s) while receiving message from %s",
3182 input_error? "Input read" : "Spool write",
3183 msg_errno,
3184 sender_fullhost ? sender_fullhost : sender_ident);
3185
3186 log_write(0, LOG_MAIN, "Message abandoned: %s", msg);
3187 Uunlink(spool_name); /* Lose the data file */
3188 cancel_cutthrough_connection(TRUE, US"error writing spoolfile");
3189
3190 if (smtp_input)
3191 {
3192 if (input_error)
3193 smtp_reply = US"451 Error while reading input data";
3194 else
3195 {
3196 smtp_reply = US"451 Error while writing spool file";
3197 receive_swallow_smtp();
3198 }
3199 message_id[0] = 0; /* Indicate no message accepted */
3200 goto TIDYUP; /* Skip to end of function */
3201 }
3202
3203 else
3204 {
3205 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3206 give_local_error(ERRMESS_IOERR, msg, US"", error_rc, spool_data_file,
3207 header_list);
3208 /* Does not return */
3209 }
3210 }
3211
3212
3213 /* No I/O errors were encountered while writing the data file. */
3214
3215 DEBUG(D_receive) debug_printf("Data file written for message %s\n", message_id);
3216 if (LOGGING(receive_time)) timesince(&received_time_taken, &received_time);
3217
3218
3219 /* If there were any bad addresses extracted by -t, or there were no recipients
3220 left after -t, send a message to the sender of this message, or write it to
3221 stderr if the error handling option is set that way. Note that there may
3222 legitimately be no recipients for an SMTP message if they have all been removed
3223 by "discard".
3224
3225 We need to rewind the data file in order to read it. In the case of no
3226 recipients or stderr error writing, throw the data file away afterwards, and
3227 exit. (This can't be SMTP, which always ensures there's at least one
3228 syntactically good recipient address.) */
3229
3230 if (extract_recip && (bad_addresses || recipients_count == 0))
3231 {
3232 DEBUG(D_receive)
3233 {
3234 if (recipients_count == 0) debug_printf("*** No recipients\n");
3235 if (bad_addresses)
3236 {
3237 error_block *eblock = bad_addresses;
3238 debug_printf("*** Bad address(es)\n");
3239 while (eblock != NULL)
3240 {
3241 debug_printf(" %s: %s\n", eblock->text1, eblock->text2);
3242 eblock = eblock->next;
3243 }
3244 }
3245 }
3246
3247 fseek(spool_data_file, (long int)SPOOL_DATA_START_OFFSET, SEEK_SET);
3248
3249 /* If configured to send errors to the sender, but this fails, force
3250 a failure error code. We use a special one for no recipients so that it
3251 can be detected by the autoreply transport. Otherwise error_rc is set to
3252 errors_sender_rc, which is EXIT_FAILURE unless -oee was given, in which case
3253 it is EXIT_SUCCESS. */
3254
3255 if (error_handling == ERRORS_SENDER)
3256 {
3257 if (!moan_to_sender(
3258 (bad_addresses == NULL)?
3259 (extracted_ignored? ERRMESS_IGADDRESS : ERRMESS_NOADDRESS) :
3260 (recipients_list == NULL)? ERRMESS_BADNOADDRESS : ERRMESS_BADADDRESS,
3261 bad_addresses, header_list, spool_data_file, FALSE))
3262 error_rc = (bad_addresses == NULL)? EXIT_NORECIPIENTS : EXIT_FAILURE;
3263 }
3264 else
3265 {
3266 if (!bad_addresses)
3267 if (extracted_ignored)
3268 fprintf(stderr, "exim: all -t recipients overridden by command line\n");
3269 else
3270 fprintf(stderr, "exim: no recipients in message\n");
3271 else
3272 {
3273 fprintf(stderr, "exim: invalid address%s",
3274 bad_addresses->next ? "es:\n" : ":");
3275 for ( ; bad_addresses; bad_addresses = bad_addresses->next)
3276 fprintf(stderr, " %s: %s\n", bad_addresses->text1,
3277 bad_addresses->text2);
3278 }
3279 }
3280
3281 if (recipients_count == 0 || error_handling == ERRORS_STDERR)
3282 {
3283 Uunlink(spool_name);
3284 (void)fclose(spool_data_file);
3285 exim_exit(error_rc, US"receiving");
3286 }
3287 }
3288
3289 /* Data file successfully written. Generate text for the Received: header by
3290 expanding the configured string, and adding a timestamp. By leaving this
3291 operation till now, we ensure that the timestamp is the time that message
3292 reception was completed. However, this is deliberately done before calling the
3293 data ACL and local_scan().
3294
3295 This Received: header may therefore be inspected by the data ACL and by code in
3296 the local_scan() function. When they have run, we update the timestamp to be
3297 the final time of reception.
3298
3299 If there is just one recipient, set up its value in the $received_for variable
3300 for use when we generate the Received: header.
3301
3302 Note: the checking for too many Received: headers is handled by the delivery
3303 code. */
3304 /*XXX eventually add excess Received: check for cutthrough case back when classifying them */
3305
3306 if (!received_header->text) /* Non-cutthrough case */
3307 {
3308 received_header_gen();
3309
3310 /* Set the value of message_body_size for the DATA ACL and for local_scan() */
3311
3312 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3313 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3314
3315 /* If an ACL from any RCPT commands set up any warning headers to add, do so
3316 now, before running the DATA ACL. */
3317
3318 add_acl_headers(ACL_WHERE_RCPT, US"MAIL or RCPT");
3319 }
3320 else
3321 message_body_size = (fstat(data_fd, &statbuf) == 0)?
3322 statbuf.st_size - SPOOL_DATA_START_OFFSET : -1;
3323
3324 /* If an ACL is specified for checking things at this stage of reception of a
3325 message, run it, unless all the recipients were removed by "discard" in earlier
3326 ACLs. That is the only case in which recipients_count can be zero at this
3327 stage. Set deliver_datafile to point to the data file so that $message_body and
3328 $message_body_end can be extracted if needed. Allow $recipients in expansions.
3329 */
3330
3331 deliver_datafile = data_fd;
3332 user_msg = NULL;
3333
3334 enable_dollar_recipients = TRUE;
3335
3336 if (recipients_count == 0)
3337 blackholed_by = recipients_discarded ? US"MAIL ACL" : US"RCPT ACL";
3338
3339 else
3340 {
3341 /* Handle interactive SMTP messages */
3342
3343 if (smtp_input && !smtp_batched_input)
3344 {
3345
3346 #ifndef DISABLE_DKIM
3347 if (!dkim_disable_verify)
3348 {
3349 /* Finish verification */
3350 dkim_exim_verify_finish();
3351
3352 /* Check if we must run the DKIM ACL */
3353 if (acl_smtp_dkim && dkim_verify_signers && *dkim_verify_signers)
3354 {
3355 uschar * dkim_verify_signers_expanded =
3356 expand_string(dkim_verify_signers);
3357 gstring * results = NULL;
3358 int signer_sep = 0;
3359 const uschar * ptr;
3360 uschar * item;
3361 gstring * seen_items = NULL;
3362 int old_pool = store_pool;
3363
3364 store_pool = POOL_PERM; /* Allow created variables to live to data ACL */
3365
3366 if (!(ptr = dkim_verify_signers_expanded))
3367 log_write(0, LOG_MAIN|LOG_PANIC,
3368 "expansion of dkim_verify_signers option failed: %s",
3369 expand_string_message);
3370
3371 /* Default to OK when no items are present */
3372 rc = OK;
3373 while ((item = string_nextinlist(&ptr, &signer_sep, NULL, 0)))
3374 {
3375 /* Prevent running ACL for an empty item */
3376 if (!item || !*item) continue;
3377
3378 /* Only run ACL once for each domain or identity,
3379 no matter how often it appears in the expanded list. */
3380 if (seen_items)
3381 {
3382 uschar * seen_item;
3383 const uschar * seen_items_list = string_from_gstring(seen_items);
3384 int seen_sep = ':';
3385 BOOL seen_this_item = FALSE;
3386
3387 while ((seen_item = string_nextinlist(&seen_items_list, &seen_sep,
3388 NULL, 0)))
3389 if (Ustrcmp(seen_item,item) == 0)
3390 {
3391 seen_this_item = TRUE;
3392 break;
3393 }
3394
3395 if (seen_this_item)
3396 {
3397 DEBUG(D_receive)
3398 debug_printf("acl_smtp_dkim: skipping signer %s, "
3399 "already seen\n", item);
3400 continue;
3401 }
3402
3403 seen_items = string_catn(seen_items, US":", 1);
3404 }
3405 seen_items = string_cat(seen_items, item);
3406
3407 rc = dkim_exim_acl_run(item, &results, &user_msg, &log_msg);
3408 if (rc != OK)
3409 {
3410 DEBUG(D_receive)
3411 debug_printf("acl_smtp_dkim: acl_check returned %d on %s, "
3412 "skipping remaining items\n", rc, item);
3413 cancel_cutthrough_connection(TRUE, US"dkim acl not ok");
3414 break;
3415 }
3416 }
3417 dkim_verify_status = string_from_gstring(results);
3418 store_pool = old_pool;
3419 add_acl_headers(ACL_WHERE_DKIM, US"DKIM");
3420 if (rc == DISCARD)
3421 {
3422 recipients_count = 0;
3423 blackholed_by = US"DKIM ACL";
3424 if (log_msg)
3425 blackhole_log_msg = string_sprintf(": %s", log_msg);
3426 }
3427 else if (rc != OK)
3428 {
3429 Uunlink(spool_name);
3430 if (smtp_handle_acl_fail(ACL_WHERE_DKIM, rc, user_msg, log_msg) != 0)
3431 smtp_yield = FALSE; /* No more messages after dropped connection */
3432 smtp_reply = US""; /* Indicate reply already sent */
3433 message_id[0] = 0; /* Indicate no message accepted */
3434 goto TIDYUP; /* Skip to end of function */
3435 }
3436 }
3437 else
3438 dkim_exim_verify_log_all();
3439 }
3440 #endif /* DISABLE_DKIM */
3441
3442 #ifdef WITH_CONTENT_SCAN
3443 if ( recipients_count > 0
3444 && acl_smtp_mime
3445 && !run_mime_acl(acl_smtp_mime, &smtp_yield, &smtp_reply, &blackholed_by)
3446 )
3447 goto TIDYUP;
3448 #endif /* WITH_CONTENT_SCAN */
3449
3450 #ifdef EXPERIMENTAL_DMARC
3451 dmarc_up = dmarc_store_data(from_header);
3452 #endif /* EXPERIMENTAL_DMARC */
3453
3454 #ifndef DISABLE_PRDR
3455 if (prdr_requested && recipients_count > 1 && acl_smtp_data_prdr)
3456 {
3457 unsigned int c;
3458 int all_pass = OK;
3459 int all_fail = FAIL;
3460
3461 smtp_printf("353 PRDR content analysis beginning\r\n", TRUE);
3462 /* Loop through recipients, responses must be in same order received */
3463 for (c = 0; recipients_count > c; c++)
3464 {
3465 uschar * addr= recipients_list[c].address;
3466 uschar * msg= US"PRDR R=<%s> %s";
3467 uschar * code;
3468 DEBUG(D_receive)
3469 debug_printf("PRDR processing recipient %s (%d of %d)\n",
3470 addr, c+1, recipients_count);
3471 rc = acl_check(ACL_WHERE_PRDR, addr,
3472 acl_smtp_data_prdr, &user_msg, &log_msg);
3473
3474 /* If any recipient rejected content, indicate it in final message */
3475 all_pass |= rc;
3476 /* If all recipients rejected, indicate in final message */
3477 all_fail &= rc;
3478
3479 switch (rc)
3480 {
3481 case OK: case DISCARD: code = US"250"; break;
3482 case DEFER: code = US"450"; break;
3483 default: code = US"550"; break;
3484 }
3485 if (user_msg != NULL)
3486 smtp_user_msg(code, user_msg);
3487 else
3488 {
3489 switch (rc)
3490 {
3491 case OK: case DISCARD:
3492 msg = string_sprintf(CS msg, addr, "acceptance"); break;
3493 case DEFER:
3494 msg = string_sprintf(CS msg, addr, "temporary refusal"); break;
3495 default:
3496 msg = string_sprintf(CS msg, addr, "refusal"); break;
3497 }
3498 smtp_user_msg(code, msg);
3499 }
3500 if (log_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, log_msg);
3501 else if (user_msg) log_write(0, LOG_MAIN, "PRDR %s %s", addr, user_msg);
3502 else log_write(0, LOG_MAIN, "%s", CS