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