3 * inc.c -- incorporate messages from a maildrop into a folder
9 /* Revised: Sat Apr 14 17:08:17 PDT 1990 (marvit@hplabs)
10 * Added hpux hacks to set and reset gid to be "mail" as needed. The reset
11 * is necessary so inc'ed mail is the group of the inc'er, rather than
12 * "mail". We setgid to egid only when [un]locking the mail file. This
13 * is also a major security precaution which will not be explained here.
15 * Fri Feb 7 16:04:57 PST 1992 John Romine <bug-mh@ics.uci.edu>
16 * NB: I'm not 100% sure that this setgid stuff is secure even now.
18 * See the *GROUPPRIVS() macros later. I'm reasonably happy with the setgid
19 * attribute. Running setuid root is probably not a terribly good idea, though.
20 * -- Peter Maydell <pmaydell@chiark.greenend.org.uk>, 04/1998
22 * Peter Maydell's patch slightly modified for nmh 0.28-pre2.
23 * Ruud de Rooij <ruud@debian.org> Wed, 22 Jul 1998 13:24:22 +0200
31 # include <h/dropsbr.h>
32 # include <h/popsbr.h>
39 #include <h/fmt_scan.h>
40 #include <h/scansbr.h>
41 #include <h/signals.h>
43 #include <zotnet/mts/mts.h>
48 # define POPminc(a) (a)
54 # define RPOPminc(a) (a)
56 # define RPOPminc(a) 0
60 # define APOPminc(a) (a)
62 # define APOPminc(a) 0
66 # define KPOPminc(a) (a)
68 # define KPOPminc(a) 0
72 # define SASLminc(a) (a)
74 # define SASLminc(a) 0
77 static struct swit switches[] = {
79 { "audit audit-file", 0 },
89 { "form formatfile", 0 },
91 { "format string", 5 },
93 { "host hostname", POPminc (-4) },
95 { "user username", POPminc (-4) },
97 { "pack file", POPminc (-4) },
99 { "nopack", POPminc (-6) },
101 { "apop", APOPminc (-4) },
103 { "noapop", APOPminc (-6) },
105 { "rpop", RPOPminc (-4) },
107 { "norpop", RPOPminc (-6) },
117 { "width columns", 0 },
125 { "kpop", KPOPminc (-4) },
127 { "sasl", SASLminc(-4) },
128 #define SASLMECHSW 25
129 { "saslmech", SASLminc(-8) },
136 * flags for the mail source
142 static int snoop = 0;
145 extern char response[];
147 static char *packfile = NULL;
153 static int mbx_style = MMDF_FORMAT;
154 static int pd = NOTOK;
155 static FILE *pf = NULL;
158 /* This is an attempt to simplify things by putting all the
159 * privilege ops into macros.
160 * *GROUPPRIVS() is related to handling the setgid MAIL property,
161 * and only applies if MAILGROUP is defined.
162 * *USERPRIVS() is related to handling the setuid root property,
163 * and only applies if POP is defined [why does POP => setuid root?]
164 * Basically, SAVEGROUPPRIVS() is called right at the top of main()
165 * to initialise things, and then DROPGROUPPRIVS() and GETGROUPPRIVS()
166 * do the obvious thing. TRYDROPGROUPPRIVS() has to be safe to call
167 * before DROPUSERPRIVS() is called [this is needed because setgid()
168 * sets both effective and real uids if euid is root.]
170 * There's probably a better implementation if we're allowed to use
171 * BSD-style setreuid() rather than using POSIX saved-ids.
172 * Anyway, if you're euid root it's a bit pointless to drop the group
175 * I'm pretty happy that the security is good provided we aren't setuid root.
176 * The only things we trust with group=mail privilege are lkfopen()
181 * For setting and returning to "mail" gid
184 static int return_gid;
186 /* easy case; we're not setuid root, so can drop group privs
189 #define TRYDROPGROUPPRIVS() DROPGROUPPRIVS()
190 #else /* POP ie we are setuid root */
191 #define TRYDROPGROUPPRIVS() \
192 if (geteuid() != 0) DROPGROUPPRIVS()
194 #define DROPGROUPPRIVS() setgid(getgid())
195 #define GETGROUPPRIVS() setgid(return_gid)
196 #define SAVEGROUPPRIVS() return_gid = getegid()
198 /* define *GROUPPRIVS() as null; this avoids having lots of "#ifdef MAILGROUP"s */
199 #define TRYDROPGROUPPRIVS()
200 #define DROPGROUPPRIVS()
201 #define GETGROUPPRIVS()
202 #define SAVEGROUPPRIVS()
203 #endif /* not MAILGROUP */
206 #define DROPUSERPRIVS() setuid(getuid())
208 #define DROPUSERPRIVS()
211 /* these variables have to be globals so that done() can correctly clean up the lockfile */
212 static int locked = 0;
213 static char *newmail;
219 char *map_name(char *);
223 static int pop_action(char *);
224 static int pop_pack(char *);
225 static int map_count(void);
230 main (int argc, char **argv)
232 int chgflag = 1, trnflag = 1;
233 int noisy = 1, width = 0;
234 int rpop, i, hghnum, msgnum;
235 int kpop = 0, sasl = 0;
236 char *cp, *maildir, *folder = NULL;
237 char *format = NULL, *form = NULL;
238 char *host = NULL, *user = NULL;
239 char *audfile = NULL, *from = NULL, *saslmech = NULL;
240 char buf[BUFSIZ], **argp, *nfs, **arguments;
246 int nmsgs, nbytes, p = 0;
255 struct hes_postoffice *po;
259 /* absolutely the first thing we do is save our privileges,
260 * and drop them if we can.
266 setlocale(LC_ALL, "");
268 invo_name = r1bindex (argv[0], '/');
270 /* read user profile/context */
273 mts_init (invo_name);
274 arguments = getarguments (invo_name, argc, argv, 1);
281 * use MAILHOST environment variable if present,
283 * If that fails, use the default (if any)
284 * provided by mts.conf in mts_init()
286 if ((tmphost = getenv("MAILHOST")) != NULL)
288 else if ((po = hes_getmailhost(getusername())) != NULL &&
289 strcmp(po->po_type, "POP") == 0)
290 pophost = po->po_host;
293 * If there is a valid "pophost" entry in mts.conf,
294 * then use it as the default host.
296 if (pophost && *pophost)
299 if ((cp = getenv ("MHPOPDEBUG")) && *cp)
305 while ((cp = *argp++)) {
307 switch (smatch (++cp, switches)) {
309 ambigsw (cp, switches);
312 adios (NULL, "-%s unknown", cp);
315 snprintf (buf, sizeof(buf), "%s [+folder] [switches]", invo_name);
316 print_help (buf, switches, 1);
319 print_version(invo_name);
323 if (!(cp = *argp++) || *cp == '-')
324 adios (NULL, "missing argument to %s", argp[-2]);
325 audfile = getcpy (m_maildir (cp));
339 * The flag `trnflag' has the value:
341 * 2 if -truncate is given
342 * 1 by default (truncating is default)
343 * 0 if -notruncate is given
353 if (!(cp = *argp++) || *cp == '-')
354 adios (NULL, "missing argument to %s", argp[-2]);
355 from = path (cp, TFILE);
358 * If the truncate file is in default state,
359 * change to not truncate.
373 if (!(form = *argp++) || *form == '-')
374 adios (NULL, "missing argument to %s", argp[-2]);
378 if (!(format = *argp++) || *format == '-')
379 adios (NULL, "missing argument to %s", argp[-2]);
384 if (!(cp = *argp++) || *cp == '-')
385 adios (NULL, "missing argument to %s", argp[-2]);
390 if (!(host = *argp++) || *host == '-')
391 adios (NULL, "missing argument to %s", argp[-2]);
394 if (!(user = *argp++) || *user == '-')
395 adios (NULL, "missing argument to %s", argp[-2]);
400 if (!(cp = *argp++) || *cp == '-')
401 adios (NULL, "missing argument to %s", argp[-2]);
403 if (!(packfile = *argp++) || *packfile == '-')
404 adios (NULL, "missing argument to %s", argp[-2]);
440 if (!(saslmech = *argp++) || *saslmech == '-')
441 adios (NULL, "missing argument to %s", argp[-2]);
445 if (*cp == '+' || *cp == '@') {
447 adios (NULL, "only one folder at a time!");
449 folder = path (cp + 1, *cp == '+' ? TFOLDER : TSUBCWF);
451 adios (NULL, "usage: %s [+folder] [switches]", invo_name);
455 /* NOTE: above this point you should use TRYDROPGROUPPRIVS(),
456 * not DROPGROUPPRIVS().
461 if (from || !host || rpop <= 0)
465 /* guarantee dropping group priveleges; we might not have done so earlier */
469 * Where are we getting the new mail?
482 * Are we getting the mail from
485 if (inc_type == INC_POP) {
487 user = getusername ();
488 if ( strcmp( POPSERVICE, "kpop" ) == 0 ) {
491 if (kpop || sasl || ( rpop > 0))
492 pass = getusername ();
494 ruserpass (host, &user, &pass);
497 * initialize POP connection
499 if (pop_init (host, user, pass, snoop, kpop ? 1 : rpop, kpop,
500 sasl, saslmech) == NOTOK)
501 adios (NULL, "%s", response);
503 /* Check if there are any messages */
504 if (pop_stat (&nmsgs, &nbytes) == NOTOK)
505 adios (NULL, "%s", response);
511 adios (NULL, "no mail to incorporate");
517 * We will get the mail from a file
518 * (typically the standard maildrop)
521 if (inc_type == INC_FILE) {
524 else if ((newmail = getenv ("MAILDROP")) && *newmail)
525 newmail = m_mailpath (newmail);
526 else if ((newmail = context_find ("maildrop")) && *newmail)
527 newmail = m_mailpath (newmail);
529 newmail = concat (MAILDIR, "/", MAILFIL, NULL);
531 if (stat (newmail, &s1) == NOTOK || s1.st_size == 0)
532 adios (NULL, "no mail to incorporate");
536 /* skip the folder setup */
537 if ((inc_type == INC_POP) && packfile)
541 if (!context_find ("path"))
542 free (path ("./", TFOLDER));
544 folder = getfolder (0);
545 maildir = m_maildir (folder);
547 if (stat (maildir, &st) == NOTOK) {
549 adios (maildir, "error on folder");
550 cp = concat ("Create folder \"", maildir, "\"? ", NULL);
551 if (noisy && !getanswer (cp))
554 if (!makedir (maildir))
555 adios (NULL, "unable to create folder %s", maildir);
558 if (chdir (maildir) == NOTOK)
559 adios (maildir, "unable to change directory to");
561 /* read folder and create message structure */
562 if (!(mp = folder_read (folder)))
563 adios (NULL, "unable to read folder %s", folder);
569 if (inc_type == INC_FILE) {
570 if (access (newmail, W_OK) != NOTOK) {
573 SIGNAL (SIGHUP, SIG_IGN);
574 SIGNAL (SIGINT, SIG_IGN);
575 SIGNAL (SIGQUIT, SIG_IGN);
576 SIGNAL (SIGTERM, SIG_IGN);
579 GETGROUPPRIVS(); /* Reset gid to lock mail file */
580 in = lkfopen (newmail, "r");
583 adios (NULL, "unable to lock and fopen %s", newmail);
584 fstat (fileno(in), &s1);
587 if ((in = fopen (newmail, "r")) == NULL)
588 adios (newmail, "unable to read");
592 /* This shouldn't be necessary but it can't hurt. */
596 if ((i = stat (audfile, &st)) == NOTOK)
597 advise (NULL, "Creating Receive-Audit: %s", audfile);
598 if ((aud = fopen (audfile, "a")) == NULL)
599 adios (audfile, "unable to append to");
601 chmod (audfile, m_gmprot ());
604 fprintf (aud, from ? "<<inc>> %s -ms %s\n"
605 : host ? "<<inc>> %s -host %s -user %s%s\n"
607 dtimenow (0), from ? from : host, user,
608 rpop < 0 ? " -apop" : rpop > 0 ? " -rpop" : "");
610 fprintf (aud, from ? "<<inc>> %s -ms %s\n" : "<<inc>> %s\n",
616 if (context_find ("mhe")) {
617 cp = concat (maildir, "/++", NULL);
619 if ((mhe = fopen (cp, "a")) == NULL)
620 admonish (cp, "unable to append to");
623 chmod (cp, m_gmprot ());
628 /* Get new format string */
629 nfs = new_fs (form, format, FORMAT);
632 printf ("Incorporating new mail into %s...\n\n", folder);
638 * Get the mail from a POP server
640 if (inc_type == INC_POP) {
642 packfile = path (packfile, TFILE);
643 if (stat (packfile, &st) == NOTOK) {
645 adios (packfile, "error on file");
646 cp = concat ("Create file \"", packfile, "\"? ", NULL);
647 if (noisy && !getanswer (cp))
651 msgnum = map_count ();
652 if ((pd = mbx_open (packfile, mbx_style, getuid(), getgid(), m_gmprot()))
654 adios (packfile, "unable to open");
655 if ((pf = fdopen (pd, "w+")) == NULL)
656 adios (NULL, "unable to fdopen %s", packfile);
658 hghnum = msgnum = mp->hghmsg;
660 * Check if we have enough message space for all the new
661 * messages. If not, then realloc the folder and add enough
662 * space for all new messages plus 10 additional slots.
664 if (mp->hghmsg + nmsgs >= mp->hghoff
665 && !(mp = folder_realloc (mp, mp->lowoff, mp->hghmsg + nmsgs + 10)))
666 adios (NULL, "unable to allocate folder storage");
669 for (i = 1; i <= nmsgs; i++) {
672 fseek (pf, 0L, SEEK_CUR);
675 fwrite (mmdlm1, 1, strlen (mmdlm1), pf);
678 if (pop_retr (i, pop_pack) == NOTOK)
679 adios (NULL, "%s", response);
681 fseek (pf, 0L, SEEK_CUR);
684 adios (packfile, "write error on");
685 fseek (pf, start, SEEK_SET);
687 cp = getcpy (m_name (msgnum));
688 if ((pf = fopen (cp, "w+")) == NULL)
689 adios (cp, "unable to write");
690 chmod (cp, m_gmprot ());
693 if (pop_retr (i, pop_action) == NOTOK)
694 adios (NULL, "%s", response);
697 adios (cp, "write error on");
698 fseek (pf, 0L, SEEK_SET);
700 switch (p = scan (pf, msgnum, 0, nfs, width,
701 packfile ? 0 : msgnum == mp->hghmsg + 1 && chgflag,
702 1, NULL, stop - start, noisy)) {
704 printf ("%*d empty\n", DMAXFOLDER, msgnum);
710 /* advise (cp, "unable to read"); already advised */
729 clear_msg_flags (mp, msgnum);
730 set_exists (mp, msgnum);
731 set_unseen (mp, msgnum);
732 mp->msgflags |= SEQMOD;
737 fseek (pf, stop, SEEK_SET);
738 fwrite (mmdlm2, 1, strlen (mmdlm2), pf);
739 if (fflush (pf) || ferror (pf)) {
743 adios (packfile, "write error on");
745 map_write (packfile, pd, 0, 0L, start, stop, pos, size, noisy);
747 if (ferror(pf) || fclose (pf)) {
752 adios (cp, "write error on");
757 if (trnflag && pop_dele (i) == NOTOK)
758 adios (NULL, "%s", response);
761 if (pop_quit () == NOTOK)
762 adios (NULL, "%s", response);
764 mbx_close (packfile, pd);
771 * Get the mail from file (usually mail spool)
773 if (inc_type == INC_FILE) {
774 m_unknown (in); /* the MAGIC invocation... */
775 hghnum = msgnum = mp->hghmsg;
778 * Check if we need to allocate more space for message status.
779 * If so, then add space for an additional 100 messages.
781 if (msgnum >= mp->hghoff
782 && !(mp = folder_realloc (mp, mp->lowoff, mp->hghoff + 100))) {
783 advise (NULL, "unable to allocate folder storage");
789 /* copy file from spool to tmp file */
790 tmpfilenam = m_scratch ("", invo_name);
791 if ((fd = creat (tmpfilenam, m_gmprot ())) == NOTOK)
792 adios (tmpfilenam, "unable to create");
793 chmod (tmpfilenam, m_gmprot ());
794 if (!(in2 = fdopen (fd, "r+")))
795 adios (tmpfilenam, "unable to access");
798 /* link message into folder */
799 newmsg = folder_addmsg(mp, tmpfilenam);
802 /* create scanline for new message */
803 switch (i = scan (in, msgnum + 1, msgnum + 1, nfs, width,
804 msgnum == hghnum && chgflag, 1, NULL, 0L, noisy)) {
811 fputs ("inc aborted!\n", aud);
812 advise (NULL, "aborted!"); /* doesn't clean up locks! */
816 advise (NULL, "BUG in %s, number out of range", invo_name);
820 advise (NULL, "BUG in %s, scan() botch (%d)", invo_name, i);
836 clear_msg_flags (mp, msgnum);
837 set_exists (mp, msgnum);
838 set_unseen (mp, msgnum);
839 mp->msgflags |= SEQMOD;
847 if (p < 0) { /* error */
849 if (i < 0) { /* error */
852 GETGROUPPRIVS(); /* Be sure we can unlock mail file */
853 (void) lkfclose (in, newmail); in = NULL;
854 DROPGROUPPRIVS(); /* And then return us to normal privileges */
856 fclose (in); in = NULL;
858 adios (NULL, "failed");
873 if ((inc_type == INC_POP) && packfile)
878 * truncate file we are incorporating from
880 if (inc_type == INC_FILE) {
882 if (stat (newmail, &st) != NOTOK && s1.st_mtime != st.st_mtime)
883 advise (NULL, "new messages have arrived!\007");
885 if ((i = creat (newmail, 0600)) != NOTOK)
888 admonish (newmail, "error zero'ing");
889 unlink(map_name(newmail));
893 printf ("%s not zero'd\n", newmail);
897 if (msgnum == hghnum) {
898 admonish (NULL, "no messages incorporated");
900 context_replace (pfolder, folder); /* update current folder */
902 mp->curmsg = hghnum + 1;
906 if (chgflag) /* sigh... */
907 seq_setcur (mp, mp->curmsg);
911 * unlock the mail spool
913 if (inc_type == INC_FILE) {
915 GETGROUPPRIVS(); /* Be sure we can unlock mail file */
916 (void) lkfclose (in, newmail); in = NULL;
917 DROPGROUPPRIVS(); /* And then return us to normal privileges */
919 fclose (in); in = NULL;
923 seq_setunseen (mp, 0); /* set the Unseen-Sequence */
924 seq_save (mp); /* synchronize sequences */
925 context_save (); /* save the context file */
933 * Copy message message from spool into
934 * temporary file. Massage the "From " line
938 cpymsg (FILE *in, FILE *out)
941 char *tmpbuf, name[NAMESZ];
944 state = m_getfld (state, name, tmpbuf, rlwidth, in);
967 if (packfile && pd != NOTOK)
968 mbx_close (packfile, pd);
973 lkfclose(in, newmail);
977 return 1; /* dead code to satisfy the compiler */
984 fprintf (pf, "%s\n", s);
985 stop += strlen (s) + 1;
986 return 0; /* Is return value used? This was missing before 1999-07-15. */
995 snprintf (buffer, sizeof(buffer), "%s\n", s);
996 for (j = 0; (j = stringdex (mmdlm1, buffer)) >= 0; buffer[j]++)
998 for (j = 0; (j = stringdex (mmdlm2, buffer)) >= 0; buffer[j]++)
1001 size += strlen (buffer) + 1;
1002 return 0; /* Is return value used? This was missing before 1999-07-15. */
1013 if (stat (packfile, &st) == NOTOK)
1015 if ((md = open (cp = map_name (packfile), O_RDONLY)) == NOTOK
1016 || map_chk (cp, md, &d, (long) st.st_size, 1)) {