1 /* 2 * Copyright (c) 1983 Eric P. Allman 3 * Copyright (c) 1988, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * %sccs.include.redist.c% 7 */ 8 9 #ifndef lint 10 static char sccsid[] = "@(#)recipient.c 8.8 (Berkeley) 07/19/93"; 11 #endif /* not lint */ 12 13 # include "sendmail.h" 14 # include <pwd.h> 15 16 /* 17 ** SENDTOLIST -- Designate a send list. 18 ** 19 ** The parameter is a comma-separated list of people to send to. 20 ** This routine arranges to send to all of them. 21 ** 22 ** Parameters: 23 ** list -- the send list. 24 ** ctladdr -- the address template for the person to 25 ** send to -- effective uid/gid are important. 26 ** This is typically the alias that caused this 27 ** expansion. 28 ** sendq -- a pointer to the head of a queue to put 29 ** these people into. 30 ** e -- the envelope in which to add these recipients. 31 ** 32 ** Returns: 33 ** The number of addresses actually on the list. 34 ** 35 ** Side Effects: 36 ** none. 37 */ 38 39 # define MAXRCRSN 10 40 41 sendtolist(list, ctladdr, sendq, e) 42 char *list; 43 ADDRESS *ctladdr; 44 ADDRESS **sendq; 45 register ENVELOPE *e; 46 { 47 register char *p; 48 register ADDRESS *al; /* list of addresses to send to */ 49 bool firstone; /* set on first address sent */ 50 char delimiter; /* the address delimiter */ 51 int naddrs; 52 char *oldto = e->e_to; 53 54 if (tTd(25, 1)) 55 { 56 printf("sendto: %s\n ctladdr=", list); 57 printaddr(ctladdr, FALSE); 58 } 59 60 /* heuristic to determine old versus new style addresses */ 61 if (ctladdr == NULL && 62 (strchr(list, ',') != NULL || strchr(list, ';') != NULL || 63 strchr(list, '<') != NULL || strchr(list, '(') != NULL)) 64 e->e_flags &= ~EF_OLDSTYLE; 65 delimiter = ' '; 66 if (!bitset(EF_OLDSTYLE, e->e_flags) || ctladdr != NULL) 67 delimiter = ','; 68 69 firstone = TRUE; 70 al = NULL; 71 naddrs = 0; 72 73 for (p = list; *p != '\0'; ) 74 { 75 auto char *delimptr; 76 register ADDRESS *a; 77 78 /* parse the address */ 79 while ((isascii(*p) && isspace(*p)) || *p == ',') 80 p++; 81 a = parseaddr(p, (ADDRESS *) NULL, 1, delimiter, &delimptr, e); 82 p = delimptr; 83 if (a == NULL) 84 continue; 85 a->q_next = al; 86 a->q_alias = ctladdr; 87 88 /* see if this should be marked as a primary address */ 89 if (ctladdr == NULL || 90 (firstone && *p == '\0' && bitset(QPRIMARY, ctladdr->q_flags))) 91 a->q_flags |= QPRIMARY; 92 93 if (ctladdr != NULL && sameaddr(ctladdr, a)) 94 ctladdr->q_flags |= QSELFREF; 95 al = a; 96 firstone = FALSE; 97 } 98 99 /* arrange to send to everyone on the local send list */ 100 while (al != NULL) 101 { 102 register ADDRESS *a = al; 103 104 al = a->q_next; 105 a = recipient(a, sendq, e); 106 107 /* arrange to inherit full name */ 108 if (a->q_fullname == NULL && ctladdr != NULL) 109 a->q_fullname = ctladdr->q_fullname; 110 naddrs++; 111 } 112 113 e->e_to = oldto; 114 return (naddrs); 115 } 116 /* 117 ** RECIPIENT -- Designate a message recipient 118 ** 119 ** Saves the named person for future mailing. 120 ** 121 ** Parameters: 122 ** a -- the (preparsed) address header for the recipient. 123 ** sendq -- a pointer to the head of a queue to put the 124 ** recipient in. Duplicate supression is done 125 ** in this queue. 126 ** e -- the current envelope. 127 ** 128 ** Returns: 129 ** The actual address in the queue. This will be "a" if 130 ** the address is not a duplicate, else the original address. 131 ** 132 ** Side Effects: 133 ** none. 134 */ 135 136 ADDRESS * 137 recipient(a, sendq, e) 138 register ADDRESS *a; 139 register ADDRESS **sendq; 140 register ENVELOPE *e; 141 { 142 register ADDRESS *q; 143 ADDRESS **pq; 144 register struct mailer *m; 145 register char *p; 146 bool quoted = FALSE; /* set if the addr has a quote bit */ 147 int findusercount = 0; 148 char buf[MAXNAME]; /* unquoted image of the user name */ 149 extern int safefile(); 150 151 e->e_to = a->q_paddr; 152 m = a->q_mailer; 153 errno = 0; 154 if (tTd(26, 1)) 155 { 156 printf("\nrecipient: "); 157 printaddr(a, FALSE); 158 } 159 160 /* break aliasing loops */ 161 if (AliasLevel > MAXRCRSN) 162 { 163 usrerr("554 aliasing/forwarding loop broken"); 164 return (a); 165 } 166 167 /* 168 ** Finish setting up address structure. 169 */ 170 171 /* set the queue timeout */ 172 a->q_timeout = TimeOuts.to_q_return; 173 174 /* get unquoted user for file, program or user.name check */ 175 (void) strcpy(buf, a->q_user); 176 for (p = buf; *p != '\0' && !quoted; p++) 177 { 178 if (*p == '\\') 179 quoted = TRUE; 180 } 181 stripquotes(buf); 182 183 /* check for direct mailing to restricted mailers */ 184 if (a->q_alias == NULL && m == ProgMailer && 185 !bitset(EF_QUEUERUN, e->e_flags)) 186 { 187 a->q_flags |= QBADADDR; 188 usrerr("550 Cannot mail directly to programs"); 189 } 190 191 /* 192 ** Look up this person in the recipient list. 193 ** If they are there already, return, otherwise continue. 194 ** If the list is empty, just add it. Notice the cute 195 ** hack to make from addresses suppress things correctly: 196 ** the QDONTSEND bit will be set in the send list. 197 ** [Please note: the emphasis is on "hack."] 198 */ 199 200 for (pq = sendq; (q = *pq) != NULL; pq = &q->q_next) 201 { 202 if (sameaddr(q, a)) 203 { 204 if (tTd(26, 1)) 205 { 206 printf("%s in sendq: ", a->q_paddr); 207 printaddr(q, FALSE); 208 } 209 if (!bitset(QPRIMARY, q->q_flags)) 210 { 211 if (!bitset(QDONTSEND, a->q_flags)) 212 message("duplicate suppressed"); 213 q->q_flags |= a->q_flags; 214 } 215 a = q; 216 goto testselfdestruct; 217 } 218 } 219 220 /* add address on list */ 221 *pq = a; 222 a->q_next = NULL; 223 224 /* 225 ** Alias the name and handle special mailer types. 226 */ 227 228 trylocaluser: 229 if (tTd(29, 7)) 230 printf("at trylocaluser %s\n", a->q_user); 231 232 if (bitset(QDONTSEND|QBADADDR|QVERIFIED, a->q_flags)) 233 goto testselfdestruct; 234 235 if (m == InclMailer) 236 { 237 a->q_flags |= QDONTSEND; 238 if (a->q_alias == NULL && !bitset(EF_QUEUERUN, e->e_flags)) 239 { 240 a->q_flags |= QBADADDR; 241 usrerr("550 Cannot mail directly to :include:s"); 242 } 243 else 244 { 245 int ret; 246 247 message("including file %s", a->q_user); 248 ret = include(a->q_user, FALSE, a, sendq, e); 249 if (transienterror(ret)) 250 { 251 #ifdef LOG 252 if (LogLevel > 2) 253 syslog(LOG_ERR, "%s: include %s: transient error: %e", 254 e->e_id, a->q_user, errstring(ret)); 255 #endif 256 a->q_flags |= QQUEUEUP; 257 usrerr("451 Cannot open %s: %s", 258 a->q_user, errstring(ret)); 259 } 260 else if (ret != 0) 261 { 262 a->q_flags |= QBADADDR; 263 usrerr("550 Cannot open %s: %s", 264 a->q_user, errstring(ret)); 265 } 266 } 267 } 268 else if (m == FileMailer) 269 { 270 struct stat stb; 271 extern bool writable(); 272 273 p = strrchr(buf, '/'); 274 /* check if writable or creatable */ 275 if (a->q_alias == NULL && !bitset(EF_QUEUERUN, e->e_flags)) 276 { 277 a->q_flags |= QBADADDR; 278 usrerr("550 Cannot mail directly to files"); 279 } 280 else if ((stat(buf, &stb) >= 0) ? (!writable(&stb)) : 281 (*p = '\0', safefile(buf, RealUid, TRUE, S_IWRITE|S_IEXEC) != 0)) 282 { 283 a->q_flags |= QBADADDR; 284 giveresponse(EX_CANTCREAT, m, NULL, e); 285 } 286 } 287 288 if (m != LocalMailer) 289 { 290 if (!bitset(QDONTSEND, a->q_flags)) 291 e->e_nrcpts++; 292 goto testselfdestruct; 293 } 294 295 /* try aliasing */ 296 alias(a, sendq, e); 297 298 # ifdef USERDB 299 /* if not aliased, look it up in the user database */ 300 if (!bitset(QDONTSEND|QNOTREMOTE|QVERIFIED, a->q_flags)) 301 { 302 extern int udbexpand(); 303 extern int errno; 304 305 if (udbexpand(a, sendq, e) == EX_TEMPFAIL) 306 { 307 a->q_flags |= QQUEUEUP; 308 if (e->e_message == NULL) 309 e->e_message = newstr("Deferred: user database error"); 310 # ifdef LOG 311 if (LogLevel > 8) 312 syslog(LOG_INFO, "%s: deferred: udbexpand: %s", 313 e->e_id, errstring(errno)); 314 # endif 315 message("queued (user database error): %s", 316 errstring(errno)); 317 e->e_nrcpts++; 318 goto testselfdestruct; 319 } 320 } 321 # endif 322 323 /* if it was an alias or a UDB expansion, just return now */ 324 if (bitset(QDONTSEND|QQUEUEUP|QVERIFIED, a->q_flags)) 325 goto testselfdestruct; 326 327 /* 328 ** If we have a level two config file, then pass the name through 329 ** Ruleset 5 before sending it off. Ruleset 5 has the right 330 ** to send rewrite it to another mailer. This gives us a hook 331 ** after local aliasing has been done. 332 */ 333 334 if (tTd(29, 5)) 335 { 336 printf("recipient: testing local? cl=%d, rr5=%x\n\t", 337 ConfigLevel, RewriteRules[5]); 338 printaddr(a, FALSE); 339 } 340 if (!bitset(QNOTREMOTE, a->q_flags) && ConfigLevel >= 2 && 341 RewriteRules[5] != NULL) 342 { 343 maplocaluser(a, sendq, e); 344 } 345 346 /* 347 ** If it didn't get rewritten to another mailer, go ahead 348 ** and deliver it. 349 */ 350 351 if (!bitset(QDONTSEND|QQUEUEUP, a->q_flags)) 352 { 353 auto bool fuzzy; 354 register struct passwd *pw; 355 extern struct passwd *finduser(); 356 357 /* warning -- finduser may trash buf */ 358 pw = finduser(buf, &fuzzy); 359 if (pw == NULL) 360 { 361 a->q_flags |= QBADADDR; 362 giveresponse(EX_NOUSER, m, NULL, e); 363 } 364 else 365 { 366 char nbuf[MAXNAME]; 367 368 if (fuzzy) 369 { 370 /* name was a fuzzy match */ 371 a->q_user = newstr(pw->pw_name); 372 if (findusercount++ > 3) 373 { 374 a->q_flags |= QBADADDR; 375 usrerr("554 aliasing/forwarding loop for %s broken", 376 pw->pw_name); 377 return (a); 378 } 379 380 /* see if it aliases */ 381 (void) strcpy(buf, pw->pw_name); 382 goto trylocaluser; 383 } 384 a->q_home = newstr(pw->pw_dir); 385 a->q_uid = pw->pw_uid; 386 a->q_gid = pw->pw_gid; 387 a->q_ruser = newstr(pw->pw_name); 388 a->q_flags |= QGOODUID; 389 buildfname(pw->pw_gecos, pw->pw_name, nbuf); 390 if (nbuf[0] != '\0') 391 a->q_fullname = newstr(nbuf); 392 if (!quoted) 393 forward(a, sendq, e); 394 } 395 } 396 if (!bitset(QDONTSEND, a->q_flags)) 397 e->e_nrcpts++; 398 399 testselfdestruct: 400 if (a->q_alias == NULL && a != &e->e_from) 401 { 402 q = a->q_next; 403 while (q != NULL && bitset(QDONTSEND|QBADADDR, q->q_flags)) 404 q = q->q_next; 405 if (bitset(QDONTSEND, a->q_flags) && q == NULL) 406 { 407 a->q_flags |= QBADADDR; 408 usrerr("554 aliasing/forwarding loop broken"); 409 } 410 } 411 return (a); 412 } 413 /* 414 ** FINDUSER -- find the password entry for a user. 415 ** 416 ** This looks a lot like getpwnam, except that it may want to 417 ** do some fancier pattern matching in /etc/passwd. 418 ** 419 ** This routine contains most of the time of many sendmail runs. 420 ** It deserves to be optimized. 421 ** 422 ** Parameters: 423 ** name -- the name to match against. 424 ** fuzzyp -- an outarg that is set to TRUE if this entry 425 ** was found using the fuzzy matching algorithm; 426 ** set to FALSE otherwise. 427 ** 428 ** Returns: 429 ** A pointer to a pw struct. 430 ** NULL if name is unknown or ambiguous. 431 ** 432 ** Side Effects: 433 ** may modify name. 434 */ 435 436 struct passwd * 437 finduser(name, fuzzyp) 438 char *name; 439 bool *fuzzyp; 440 { 441 register struct passwd *pw; 442 register char *p; 443 extern struct passwd *getpwent(); 444 extern struct passwd *getpwnam(); 445 446 if (tTd(29, 4)) 447 printf("finduser(%s): ", name); 448 449 *fuzzyp = FALSE; 450 451 /* look up this login name using fast path */ 452 if ((pw = getpwnam(name)) != NULL) 453 { 454 if (tTd(29, 4)) 455 printf("found (non-fuzzy)\n"); 456 return (pw); 457 } 458 459 #ifdef MATCHGECOS 460 /* see if fuzzy matching allowed */ 461 if (!MatchGecos) 462 { 463 if (tTd(29, 4)) 464 printf("not found (fuzzy disabled)\n"); 465 return NULL; 466 } 467 468 /* search for a matching full name instead */ 469 for (p = name; *p != '\0'; p++) 470 { 471 if (*p == (SpaceSub & 0177) || *p == '_') 472 *p = ' '; 473 } 474 (void) setpwent(); 475 while ((pw = getpwent()) != NULL) 476 { 477 char buf[MAXNAME]; 478 479 buildfname(pw->pw_gecos, pw->pw_name, buf); 480 if (strchr(buf, ' ') != NULL && !strcasecmp(buf, name)) 481 { 482 if (tTd(29, 4)) 483 printf("fuzzy matches %s\n", pw->pw_name); 484 message("sending to login name %s", pw->pw_name); 485 *fuzzyp = TRUE; 486 return (pw); 487 } 488 } 489 if (tTd(29, 4)) 490 printf("no fuzzy match found\n"); 491 #else 492 if (tTd(29, 4)) 493 printf("not found (fuzzy disabled)\n"); 494 #endif 495 return (NULL); 496 } 497 /* 498 ** WRITABLE -- predicate returning if the file is writable. 499 ** 500 ** This routine must duplicate the algorithm in sys/fio.c. 501 ** Unfortunately, we cannot use the access call since we 502 ** won't necessarily be the real uid when we try to 503 ** actually open the file. 504 ** 505 ** Notice that ANY file with ANY execute bit is automatically 506 ** not writable. This is also enforced by mailfile. 507 ** 508 ** Parameters: 509 ** s -- pointer to a stat struct for the file. 510 ** 511 ** Returns: 512 ** TRUE -- if we will be able to write this file. 513 ** FALSE -- if we cannot write this file. 514 ** 515 ** Side Effects: 516 ** none. 517 */ 518 519 bool 520 writable(s) 521 register struct stat *s; 522 { 523 uid_t euid; 524 gid_t egid; 525 int bits; 526 527 if (bitset(0111, s->st_mode)) 528 return (FALSE); 529 euid = RealUid; 530 egid = RealGid; 531 if (geteuid() == 0) 532 { 533 if (bitset(S_ISUID, s->st_mode)) 534 euid = s->st_uid; 535 if (bitset(S_ISGID, s->st_mode)) 536 egid = s->st_gid; 537 } 538 539 if (euid == 0) 540 return (TRUE); 541 bits = S_IWRITE; 542 if (euid != s->st_uid) 543 { 544 bits >>= 3; 545 if (egid != s->st_gid) 546 bits >>= 3; 547 } 548 return ((s->st_mode & bits) != 0); 549 } 550 /* 551 ** INCLUDE -- handle :include: specification. 552 ** 553 ** Parameters: 554 ** fname -- filename to include. 555 ** forwarding -- if TRUE, we are reading a .forward file. 556 ** if FALSE, it's a :include: file. 557 ** ctladdr -- address template to use to fill in these 558 ** addresses -- effective user/group id are 559 ** the important things. 560 ** sendq -- a pointer to the head of the send queue 561 ** to put these addresses in. 562 ** 563 ** Returns: 564 ** open error status 565 ** 566 ** Side Effects: 567 ** reads the :include: file and sends to everyone 568 ** listed in that file. 569 */ 570 571 static jmp_buf CtxIncludeTimeout; 572 static int includetimeout(); 573 574 int 575 include(fname, forwarding, ctladdr, sendq, e) 576 char *fname; 577 bool forwarding; 578 ADDRESS *ctladdr; 579 ADDRESS **sendq; 580 ENVELOPE *e; 581 { 582 register FILE *fp; 583 char *oldto = e->e_to; 584 char *oldfilename = FileName; 585 int oldlinenumber = LineNumber; 586 register EVENT *ev = NULL; 587 int nincludes; 588 int ret; 589 ADDRESS *ca; 590 uid_t uid; 591 char buf[MAXLINE]; 592 593 if (tTd(27, 2)) 594 printf("include(%s)\n", fname); 595 if (tTd(27, 4)) 596 printf(" ruid=%d euid=%d\n", getuid(), geteuid()); 597 if (tTd(27, 14)) 598 { 599 printf("ctladdr "); 600 printaddr(ctladdr, FALSE); 601 } 602 603 /* 604 ** If home directory is remote mounted but server is down, 605 ** this can hang or give errors; use a timeout to avoid this 606 */ 607 608 ca = getctladdr(ctladdr); 609 if (ca == NULL) 610 uid = 0; 611 else 612 uid = ca->q_uid; 613 614 if (setjmp(CtxIncludeTimeout) != 0) 615 { 616 ctladdr->q_flags |= QQUEUEUP; 617 errno = 0; 618 usrerr("451 open timeout on %s", fname); 619 return ETIMEDOUT; 620 } 621 ev = setevent((time_t) 60, includetimeout, 0); 622 623 /* the input file must be marked safe */ 624 if ((ret = safefile(fname, uid, forwarding, S_IREAD)) != 0) 625 { 626 /* don't use this .forward file */ 627 clrevent(ev); 628 if (tTd(27, 4)) 629 printf("include: not safe (uid=%d): %s\n", 630 uid, errstring(ret)); 631 return ret; 632 } 633 634 fp = fopen(fname, "r"); 635 if (fp == NULL) 636 { 637 int ret = errno; 638 639 clrevent(ev); 640 if (tTd(27, 4)) 641 printf("include: open: %s\n", errstring(ret)); 642 return ret; 643 } 644 645 if (ca == NULL) 646 { 647 struct stat st; 648 649 if (fstat(fileno(fp), &st) < 0) 650 { 651 int ret = errno; 652 653 clrevent(ev); 654 syserr("Cannot fstat %s!", fname); 655 return ret; 656 } 657 ctladdr->q_uid = st.st_uid; 658 ctladdr->q_gid = st.st_gid; 659 ctladdr->q_flags |= QGOODUID; 660 } 661 662 clrevent(ev); 663 664 if (bitset(EF_VRFYONLY, e->e_flags)) 665 { 666 /* don't do any more now */ 667 ctladdr->q_flags |= QVERIFIED; 668 e->e_nrcpts++; 669 xfclose(fp, "include", fname); 670 return 0; 671 } 672 673 /* read the file -- each line is a comma-separated list. */ 674 FileName = fname; 675 LineNumber = 0; 676 ctladdr->q_flags &= ~QSELFREF; 677 nincludes = 0; 678 while (fgets(buf, sizeof buf, fp) != NULL) 679 { 680 register char *p = strchr(buf, '\n'); 681 682 LineNumber++; 683 if (p != NULL) 684 *p = '\0'; 685 if (buf[0] == '#' || buf[0] == '\0') 686 continue; 687 e->e_to = NULL; 688 message("%s to %s", 689 forwarding ? "forwarding" : "sending", buf); 690 #ifdef LOG 691 if (forwarding && LogLevel > 9) 692 syslog(LOG_INFO, "%s: forward %s => %s", 693 e->e_id, oldto, buf); 694 #endif 695 696 AliasLevel++; 697 nincludes += sendtolist(buf, ctladdr, sendq, e); 698 AliasLevel--; 699 } 700 701 if (ferror(fp) && tTd(27, 3)) 702 printf("include: read error: %s\n", errstring(errno)); 703 if (nincludes > 0 && !bitset(QSELFREF, ctladdr->q_flags)) 704 { 705 if (tTd(27, 5)) 706 { 707 printf("include: QDONTSEND "); 708 printaddr(ctladdr, FALSE); 709 } 710 ctladdr->q_flags |= QDONTSEND; 711 } 712 713 (void) xfclose(fp, "include", fname); 714 FileName = oldfilename; 715 LineNumber = oldlinenumber; 716 e->e_to = oldto; 717 return 0; 718 } 719 720 static 721 includetimeout() 722 { 723 longjmp(CtxIncludeTimeout, 1); 724 } 725 /* 726 ** SENDTOARGV -- send to an argument vector. 727 ** 728 ** Parameters: 729 ** argv -- argument vector to send to. 730 ** e -- the current envelope. 731 ** 732 ** Returns: 733 ** none. 734 ** 735 ** Side Effects: 736 ** puts all addresses on the argument vector onto the 737 ** send queue. 738 */ 739 740 sendtoargv(argv, e) 741 register char **argv; 742 register ENVELOPE *e; 743 { 744 register char *p; 745 746 while ((p = *argv++) != NULL) 747 { 748 (void) sendtolist(p, (ADDRESS *) NULL, &e->e_sendqueue, e); 749 } 750 } 751 /* 752 ** GETCTLADDR -- get controlling address from an address header. 753 ** 754 ** If none, get one corresponding to the effective userid. 755 ** 756 ** Parameters: 757 ** a -- the address to find the controller of. 758 ** 759 ** Returns: 760 ** the controlling address. 761 ** 762 ** Side Effects: 763 ** none. 764 */ 765 766 ADDRESS * 767 getctladdr(a) 768 register ADDRESS *a; 769 { 770 while (a != NULL && !bitset(QGOODUID, a->q_flags)) 771 a = a->q_alias; 772 return (a); 773 } 774