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1.1 root 1: /*
2: * Copyright (c) 1983 Eric P. Allman
3: * Copyright (c) 1988 Regents of the University of California.
4: * All rights reserved.
5: *
6: * Redistribution and use in source and binary forms are permitted
7: * provided that the above copyright notice and this paragraph are
8: * duplicated in all such forms and that any documentation,
9: * advertising materials, and other materials related to such
10: * distribution and use acknowledge that the software was developed
11: * by the University of California, Berkeley. The name of the
12: * University may not be used to endorse or promote products derived
13: * from this software without specific prior written permission.
14: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
15: * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
16: * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
17: */
18:
19: #ifndef lint
20: static char sccsid[] = "@(#)envelope.c 5.15 (Berkeley) 6/30/88";
21: #endif /* not lint */
22:
23: #include <pwd.h>
24: #include <sys/time.h>
25: #include "sendmail.h"
26: #include <sys/stat.h>
27:
28: /*
29: ** NEWENVELOPE -- allocate a new envelope
30: **
31: ** Supports inheritance.
32: **
33: ** Parameters:
34: ** e -- the new envelope to fill in.
35: **
36: ** Returns:
37: ** e.
38: **
39: ** Side Effects:
40: ** none.
41: */
42:
43: ENVELOPE *
44: newenvelope(e)
45: register ENVELOPE *e;
46: {
47: register ENVELOPE *parent;
48: extern putheader(), putbody();
49: extern ENVELOPE BlankEnvelope;
50:
51: parent = CurEnv;
52: if (e == CurEnv)
53: parent = e->e_parent;
54: clearenvelope(e, TRUE);
55: if (e == CurEnv)
56: bcopy((char *) &NullAddress, (char *) &e->e_from, sizeof e->e_from);
57: else
58: bcopy((char *) &CurEnv->e_from, (char *) &e->e_from, sizeof e->e_from);
59: e->e_parent = parent;
60: e->e_ctime = curtime();
61: e->e_msgpriority = parent->e_msgsize;
62: e->e_puthdr = putheader;
63: e->e_putbody = putbody;
64: if (CurEnv->e_xfp != NULL)
65: (void) fflush(CurEnv->e_xfp);
66:
67: return (e);
68: }
69: /*
70: ** DROPENVELOPE -- deallocate an envelope.
71: **
72: ** Parameters:
73: ** e -- the envelope to deallocate.
74: **
75: ** Returns:
76: ** none.
77: **
78: ** Side Effects:
79: ** housekeeping necessary to dispose of an envelope.
80: ** Unlocks this queue file.
81: */
82:
83: dropenvelope(e)
84: register ENVELOPE *e;
85: {
86: bool queueit = FALSE;
87: register ADDRESS *q;
88:
89: #ifdef DEBUG
90: if (tTd(50, 1))
91: {
92: printf("dropenvelope %x id=", e);
93: xputs(e->e_id);
94: printf(" flags=%o\n", e->e_flags);
95: }
96: #endif DEBUG
97: #ifdef LOG
98: if (LogLevel > 10)
99: syslog(LOG_DEBUG, "dropenvelope, id=%s, flags=%o, pid=%d",
100: e->e_id == NULL ? "(none)" : e->e_id,
101: e->e_flags, getpid());
102: #endif LOG
103:
104: /* we must have an id to remove disk files */
105: if (e->e_id == NULL)
106: return;
107:
108: /*
109: ** Extract state information from dregs of send list.
110: */
111:
112: for (q = e->e_sendqueue; q != NULL; q = q->q_next)
113: {
114: if (bitset(QQUEUEUP, q->q_flags))
115: queueit = TRUE;
116: }
117:
118: /*
119: ** Send back return receipts as requested.
120: */
121:
122: if (e->e_receiptto != NULL && bitset(EF_SENDRECEIPT, e->e_flags))
123: {
124: auto ADDRESS *rlist = NULL;
125:
126: sendtolist(CurEnv->e_receiptto, (ADDRESS *) NULL, &rlist);
127: (void) returntosender("Return receipt", rlist, FALSE);
128: }
129:
130: /*
131: ** Arrange to send error messages if there are fatal errors.
132: */
133:
134: if (bitset(EF_FATALERRS|EF_TIMEOUT, e->e_flags) && ErrorMode != EM_QUIET)
135: savemail(e);
136:
137: /*
138: ** Instantiate or deinstantiate the queue.
139: */
140:
141: if ((!queueit && !bitset(EF_KEEPQUEUE, e->e_flags)) ||
142: bitset(EF_CLRQUEUE, e->e_flags))
143: {
144: if (e->e_df != NULL)
145: xunlink(e->e_df);
146: xunlink(queuename(e, 'q'));
147: }
148: else if (queueit || !bitset(EF_INQUEUE, e->e_flags))
149: {
150: #ifdef QUEUE
151: queueup(e, FALSE, FALSE);
152: #else QUEUE
153: syserr("dropenvelope: queueup");
154: #endif QUEUE
155: }
156:
157: /* now unlock the job */
158: closexscript(e);
159: unlockqueue(e);
160:
161: /* make sure that this envelope is marked unused */
162: e->e_id = e->e_df = NULL;
163: if (e->e_dfp != NULL)
164: (void) fclose(e->e_dfp);
165: e->e_dfp = NULL;
166: }
167: /*
168: ** CLEARENVELOPE -- clear an envelope without unlocking
169: **
170: ** This is normally used by a child process to get a clean
171: ** envelope without disturbing the parent.
172: **
173: ** Parameters:
174: ** e -- the envelope to clear.
175: ** fullclear - if set, the current envelope is total
176: ** garbage and should be ignored; otherwise,
177: ** release any resources it may indicate.
178: **
179: ** Returns:
180: ** none.
181: **
182: ** Side Effects:
183: ** Closes files associated with the envelope.
184: ** Marks the envelope as unallocated.
185: */
186:
187: clearenvelope(e, fullclear)
188: register ENVELOPE *e;
189: bool fullclear;
190: {
191: register HDR *bh;
192: register HDR **nhp;
193: extern ENVELOPE BlankEnvelope;
194:
195: if (!fullclear)
196: {
197: /* clear out any file information */
198: if (e->e_xfp != NULL)
199: (void) fclose(e->e_xfp);
200: if (e->e_dfp != NULL)
201: (void) fclose(e->e_dfp);
202: }
203:
204: /* now clear out the data */
205: STRUCTCOPY(BlankEnvelope, *e);
206: bh = BlankEnvelope.e_header;
207: nhp = &e->e_header;
208: while (bh != NULL)
209: {
210: *nhp = (HDR *) xalloc(sizeof *bh);
211: bcopy((char *) bh, (char *) *nhp, sizeof *bh);
212: bh = bh->h_link;
213: nhp = &(*nhp)->h_link;
214: }
215: }
216: /*
217: ** INITSYS -- initialize instantiation of system
218: **
219: ** In Daemon mode, this is done in the child.
220: **
221: ** Parameters:
222: ** none.
223: **
224: ** Returns:
225: ** none.
226: **
227: ** Side Effects:
228: ** Initializes the system macros, some global variables,
229: ** etc. In particular, the current time in various
230: ** forms is set.
231: */
232:
233: initsys()
234: {
235: static char cbuf[5]; /* holds hop count */
236: static char pbuf[10]; /* holds pid */
237: #ifdef TTYNAME
238: static char ybuf[10]; /* holds tty id */
239: register char *p;
240: #endif TTYNAME
241: extern char *ttyname();
242: extern char *macvalue();
243: extern char Version[];
244:
245: /*
246: ** Give this envelope a reality.
247: ** I.e., an id, a transcript, and a creation time.
248: */
249:
250: openxscript(CurEnv);
251: CurEnv->e_ctime = curtime();
252:
253: /*
254: ** Set OutChannel to something useful if stdout isn't it.
255: ** This arranges that any extra stuff the mailer produces
256: ** gets sent back to the user on error (because it is
257: ** tucked away in the transcript).
258: */
259:
260: if (OpMode == MD_DAEMON && QueueRun)
261: OutChannel = CurEnv->e_xfp;
262:
263: /*
264: ** Set up some basic system macros.
265: */
266:
267: /* process id */
268: (void) sprintf(pbuf, "%d", getpid());
269: define('p', pbuf, CurEnv);
270:
271: /* hop count */
272: (void) sprintf(cbuf, "%d", CurEnv->e_hopcount);
273: define('c', cbuf, CurEnv);
274:
275: /* time as integer, unix time, arpa time */
276: settime();
277:
278: #ifdef TTYNAME
279: /* tty name */
280: if (macvalue('y', CurEnv) == NULL)
281: {
282: p = ttyname(2);
283: if (p != NULL)
284: {
285: if (rindex(p, '/') != NULL)
286: p = rindex(p, '/') + 1;
287: (void) strcpy(ybuf, p);
288: define('y', ybuf, CurEnv);
289: }
290: }
291: #endif TTYNAME
292: }
293: /*
294: ** SETTIME -- set the current time.
295: **
296: ** Parameters:
297: ** none.
298: **
299: ** Returns:
300: ** none.
301: **
302: ** Side Effects:
303: ** Sets the various time macros -- $a, $b, $d, $t.
304: */
305:
306: settime()
307: {
308: register char *p;
309: auto time_t now;
310: static char tbuf[20]; /* holds "current" time */
311: static char dbuf[30]; /* holds ctime(tbuf) */
312: register struct tm *tm;
313: extern char *arpadate();
314: extern struct tm *gmtime();
315: extern char *macvalue();
316:
317: now = curtime();
318: tm = gmtime(&now);
319: (void) sprintf(tbuf, "%02d%02d%02d%02d%02d", tm->tm_year, tm->tm_mon+1,
320: tm->tm_mday, tm->tm_hour, tm->tm_min);
321: define('t', tbuf, CurEnv);
322: (void) strcpy(dbuf, ctime(&now));
323: *index(dbuf, '\n') = '\0';
324: if (macvalue('d', CurEnv) == NULL)
325: define('d', dbuf, CurEnv);
326: p = newstr(arpadate(dbuf));
327: if (macvalue('a', CurEnv) == NULL)
328: define('a', p, CurEnv);
329: define('b', p, CurEnv);
330: }
331: /*
332: ** OPENXSCRIPT -- Open transcript file
333: **
334: ** Creates a transcript file for possible eventual mailing or
335: ** sending back.
336: **
337: ** Parameters:
338: ** e -- the envelope to create the transcript in/for.
339: **
340: ** Returns:
341: ** none
342: **
343: ** Side Effects:
344: ** Creates the transcript file.
345: */
346:
347: openxscript(e)
348: register ENVELOPE *e;
349: {
350: register char *p;
351:
352: # ifdef LOG
353: if (LogLevel > 19)
354: syslog(LOG_DEBUG, "%s: openx%s", e->e_id, e->e_xfp == NULL ? "" : " (no)");
355: # endif LOG
356: if (e->e_xfp != NULL)
357: return;
358: p = queuename(e, 'x');
359: e->e_xfp = fopen(p, "w");
360: if (e->e_xfp == NULL)
361: syserr("Can't create %s", p);
362: else
363: (void) chmod(p, 0644);
364: }
365: /*
366: ** CLOSEXSCRIPT -- close the transcript file.
367: **
368: ** Parameters:
369: ** e -- the envelope containing the transcript to close.
370: **
371: ** Returns:
372: ** none.
373: **
374: ** Side Effects:
375: ** none.
376: */
377:
378: closexscript(e)
379: register ENVELOPE *e;
380: {
381: if (e->e_xfp == NULL)
382: return;
383: (void) fclose(e->e_xfp);
384: e->e_xfp = NULL;
385: }
386: /*
387: ** SETSENDER -- set the person who this message is from
388: **
389: ** Under certain circumstances allow the user to say who
390: ** s/he is (using -f or -r). These are:
391: ** 1. The user's uid is zero (root).
392: ** 2. The user's login name is in an approved list (typically
393: ** from a network server).
394: ** 3. The address the user is trying to claim has a
395: ** "!" character in it (since #2 doesn't do it for
396: ** us if we are dialing out for UUCP).
397: ** A better check to replace #3 would be if the
398: ** effective uid is "UUCP" -- this would require me
399: ** to rewrite getpwent to "grab" uucp as it went by,
400: ** make getname more nasty, do another passwd file
401: ** scan, or compile the UID of "UUCP" into the code,
402: ** all of which are reprehensible.
403: **
404: ** Assuming all of these fail, we figure out something
405: ** ourselves.
406: **
407: ** Parameters:
408: ** from -- the person we would like to believe this message
409: ** is from, as specified on the command line.
410: **
411: ** Returns:
412: ** none.
413: **
414: ** Side Effects:
415: ** sets sendmail's notion of who the from person is.
416: */
417:
418: setsender(from)
419: char *from;
420: {
421: register char **pvp;
422: char *realname = NULL;
423: register struct passwd *pw;
424: char buf[MAXNAME];
425: char pvpbuf[PSBUFSIZE];
426: extern struct passwd *getpwnam();
427: extern char *macvalue();
428: extern char **prescan();
429: extern bool safefile();
430: extern char *FullName;
431:
432: # ifdef DEBUG
433: if (tTd(45, 1))
434: printf("setsender(%s)\n", from == NULL ? "" : from);
435: # endif DEBUG
436:
437: /*
438: ** Figure out the real user executing us.
439: ** Username can return errno != 0 on non-errors.
440: */
441:
442: if (QueueRun || OpMode == MD_SMTP || OpMode == MD_ARPAFTP)
443: realname = from;
444: if (realname == NULL || realname[0] == '\0')
445: {
446: extern char *username();
447:
448: realname = username();
449: }
450:
451: /*
452: ** Determine if this real person is allowed to alias themselves.
453: */
454:
455: if (from != NULL)
456: {
457: extern bool trusteduser();
458:
459: if (!trusteduser(realname) &&
460: # ifdef DEBUG
461: (!tTd(1, 9) || getuid() != geteuid()) &&
462: # endif DEBUG
463: index(from, '!') == NULL && getuid() != 0)
464: {
465: /* network sends -r regardless (why why why?) */
466: /* syserr("%s, you cannot use the -f flag", realname); */
467: from = NULL;
468: }
469: }
470:
471: SuprErrs = TRUE;
472: if (from == NULL || parseaddr(from, &CurEnv->e_from, 1, '\0') == NULL)
473: {
474: /* log garbage addresses for traceback */
475: if (from != NULL)
476: {
477: # ifdef LOG
478: if (LogLevel >= 1)
479: syslog(LOG_ERR, "Unparseable user %s wants to be %s",
480: realname, from);
481: # endif LOG
482: }
483: from = newstr(realname);
484: if (parseaddr(from, &CurEnv->e_from, 1, '\0') == NULL &&
485: parseaddr("postmaster", &CurEnv->e_from, 1, '\0') == NULL)
486: {
487: syserr("setsender: can't even parse postmaster!");
488: }
489: }
490: else
491: FromFlag = TRUE;
492: CurEnv->e_from.q_flags |= QDONTSEND;
493: loweraddr(&CurEnv->e_from);
494: SuprErrs = FALSE;
495:
496: if (CurEnv->e_from.q_mailer == LocalMailer &&
497: (pw = getpwnam(CurEnv->e_from.q_user)) != NULL)
498: {
499: /*
500: ** Process passwd file entry.
501: */
502:
503:
504: /* extract home directory */
505: CurEnv->e_from.q_home = newstr(pw->pw_dir);
506: define('z', CurEnv->e_from.q_home, CurEnv);
507:
508: /* extract user and group id */
509: CurEnv->e_from.q_uid = pw->pw_uid;
510: CurEnv->e_from.q_gid = pw->pw_gid;
511:
512: /* if the user has given fullname already, don't redefine */
513: if (FullName == NULL)
514: FullName = macvalue('x', CurEnv);
515: if (FullName != NULL && FullName[0] == '\0')
516: FullName = NULL;
517:
518: /* extract full name from passwd file */
519: if (FullName == NULL && pw->pw_gecos != NULL &&
520: strcmp(pw->pw_name, CurEnv->e_from.q_user) == 0)
521: {
522: buildfname(pw->pw_gecos, CurEnv->e_from.q_user, buf);
523: if (buf[0] != '\0')
524: FullName = newstr(buf);
525: }
526: if (FullName != NULL)
527: define('x', FullName, CurEnv);
528: }
529: else
530: {
531: if (CurEnv->e_from.q_home == NULL)
532: CurEnv->e_from.q_home = getenv("HOME");
533: CurEnv->e_from.q_uid = getuid();
534: CurEnv->e_from.q_gid = getgid();
535: }
536:
537: if (CurEnv->e_from.q_uid != 0)
538: {
539: DefUid = CurEnv->e_from.q_uid;
540: DefGid = CurEnv->e_from.q_gid;
541: }
542:
543: /*
544: ** Rewrite the from person to dispose of possible implicit
545: ** links in the net.
546: */
547:
548: pvp = prescan(from, '\0', pvpbuf);
549: if (pvp == NULL)
550: {
551: syserr("cannot prescan from (%s)", from);
552: finis();
553: }
554: rewrite(pvp, 3);
555: rewrite(pvp, 1);
556: rewrite(pvp, 4);
557: cataddr(pvp, buf, sizeof buf);
558: define('f', newstr(buf), CurEnv);
559:
560: /* save the domain spec if this mailer wants it */
561: if (CurEnv->e_from.q_mailer != NULL &&
562: bitnset(M_CANONICAL, CurEnv->e_from.q_mailer->m_flags))
563: {
564: extern char **copyplist();
565:
566: while (*pvp != NULL && strcmp(*pvp, "@") != 0)
567: pvp++;
568: if (*pvp != NULL)
569: CurEnv->e_fromdomain = copyplist(pvp, TRUE);
570: }
571: }
572: /*
573: ** TRUSTEDUSER -- tell us if this user is to be trusted.
574: **
575: ** Parameters:
576: ** user -- the user to be checked.
577: **
578: ** Returns:
579: ** TRUE if the user is in an approved list.
580: ** FALSE otherwise.
581: **
582: ** Side Effects:
583: ** none.
584: */
585:
586: bool
587: trusteduser(user)
588: char *user;
589: {
590: register char **ulist;
591: extern char *TrustedUsers[];
592:
593: for (ulist = TrustedUsers; *ulist != NULL; ulist++)
594: if (strcmp(*ulist, user) == 0)
595: return (TRUE);
596: return (FALSE);
597: }
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