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