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 8.48 (Berkeley) 08/21/94"; 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 (list == NULL) 55 { 56 syserr("sendtolist: null list"); 57 return 0; 58 } 59 60 if (tTd(25, 1)) 61 { 62 printf("sendto: %s\n ctladdr=", list); 63 printaddr(ctladdr, FALSE); 64 } 65 66 /* heuristic to determine old versus new style addresses */ 67 if (ctladdr == NULL && 68 (strchr(list, ',') != NULL || strchr(list, ';') != NULL || 69 strchr(list, '<') != NULL || strchr(list, '(') != NULL)) 70 e->e_flags &= ~EF_OLDSTYLE; 71 delimiter = ' '; 72 if (!bitset(EF_OLDSTYLE, e->e_flags) || ctladdr != NULL) 73 delimiter = ','; 74 75 firstone = TRUE; 76 al = NULL; 77 naddrs = 0; 78 79 for (p = list; *p != '\0'; ) 80 { 81 auto char *delimptr; 82 register ADDRESS *a; 83 84 /* parse the address */ 85 while ((isascii(*p) && isspace(*p)) || *p == ',') 86 p++; 87 a = parseaddr(p, NULLADDR, RF_COPYALL, delimiter, &delimptr, e); 88 p = delimptr; 89 if (a == NULL) 90 continue; 91 a->q_next = al; 92 a->q_alias = ctladdr; 93 94 /* see if this should be marked as a primary address */ 95 if (ctladdr == NULL || 96 (firstone && *p == '\0' && bitset(QPRIMARY, ctladdr->q_flags))) 97 a->q_flags |= QPRIMARY; 98 99 if (ctladdr != NULL && sameaddr(ctladdr, a)) 100 ctladdr->q_flags |= QSELFREF; 101 al = a; 102 firstone = FALSE; 103 } 104 105 /* arrange to send to everyone on the local send list */ 106 while (al != NULL) 107 { 108 register ADDRESS *a = al; 109 110 al = a->q_next; 111 a = recipient(a, sendq, e); 112 113 /* arrange to inherit full name */ 114 if (a->q_fullname == NULL && ctladdr != NULL) 115 a->q_fullname = ctladdr->q_fullname; 116 naddrs++; 117 } 118 119 e->e_to = oldto; 120 return (naddrs); 121 } 122 /* 123 ** RECIPIENT -- Designate a message recipient 124 ** 125 ** Saves the named person for future mailing. 126 ** 127 ** Parameters: 128 ** a -- the (preparsed) address header for the recipient. 129 ** sendq -- a pointer to the head of a queue to put the 130 ** recipient in. Duplicate supression is done 131 ** in this queue. 132 ** e -- the current envelope. 133 ** 134 ** Returns: 135 ** The actual address in the queue. This will be "a" if 136 ** the address is not a duplicate, else the original address. 137 ** 138 ** Side Effects: 139 ** none. 140 */ 141 142 ADDRESS * 143 recipient(a, sendq, e) 144 register ADDRESS *a; 145 register ADDRESS **sendq; 146 register ENVELOPE *e; 147 { 148 register ADDRESS *q; 149 ADDRESS **pq; 150 register struct mailer *m; 151 register char *p; 152 bool quoted = FALSE; /* set if the addr has a quote bit */ 153 int findusercount = 0; 154 int i; 155 char *buf; 156 char buf0[MAXNAME]; /* unquoted image of the user name */ 157 extern int safefile(); 158 159 e->e_to = a->q_paddr; 160 m = a->q_mailer; 161 errno = 0; 162 if (tTd(26, 1)) 163 { 164 printf("\nrecipient: "); 165 printaddr(a, FALSE); 166 } 167 168 /* if this is primary, add it to the original recipient list */ 169 if (a->q_alias == NULL) 170 { 171 if (e->e_origrcpt == NULL) 172 e->e_origrcpt = a->q_paddr; 173 else if (e->e_origrcpt != a->q_paddr) 174 e->e_origrcpt = ""; 175 } 176 177 /* break aliasing loops */ 178 if (AliasLevel > MAXRCRSN) 179 { 180 usrerr("554 aliasing/forwarding loop broken"); 181 return (a); 182 } 183 184 /* 185 ** Finish setting up address structure. 186 */ 187 188 /* get unquoted user for file, program or user.name check */ 189 i = strlen(a->q_user); 190 if (i >= sizeof buf) 191 buf = xalloc(i + 1); 192 else 193 buf = buf0; 194 (void) strcpy(buf, a->q_user); 195 for (p = buf; *p != '\0' && !quoted; p++) 196 { 197 if (*p == '\\') 198 quoted = TRUE; 199 } 200 stripquotes(buf); 201 202 /* check for direct mailing to restricted mailers */ 203 if (m == ProgMailer) 204 { 205 if (a->q_alias == NULL) 206 { 207 a->q_flags |= QBADADDR; 208 usrerr("550 Cannot mail directly to programs"); 209 } 210 else if (bitset(QBOGUSSHELL, a->q_alias->q_flags)) 211 { 212 a->q_flags |= QBADADDR; 213 usrerr("550 User %s@%s doesn't have a valid shell for mailing to programs", 214 a->q_alias->q_ruser, MyHostName); 215 } 216 else if (bitset(QUNSAFEADDR, a->q_alias->q_flags)) 217 { 218 a->q_flags |= QBADADDR; 219 usrerr("550 Address %s is unsafe for mailing to programs", 220 a->q_alias->q_paddr); 221 } 222 } 223 224 /* 225 ** Look up this person in the recipient list. 226 ** If they are there already, return, otherwise continue. 227 ** If the list is empty, just add it. Notice the cute 228 ** hack to make from addresses suppress things correctly: 229 ** the QDONTSEND bit will be set in the send list. 230 ** [Please note: the emphasis is on "hack."] 231 */ 232 233 for (pq = sendq; (q = *pq) != NULL; pq = &q->q_next) 234 { 235 if (sameaddr(q, a)) 236 { 237 if (tTd(26, 1)) 238 { 239 printf("%s in sendq: ", a->q_paddr); 240 printaddr(q, FALSE); 241 } 242 if (!bitset(QPRIMARY, q->q_flags)) 243 { 244 if (!bitset(QDONTSEND, a->q_flags)) 245 message("duplicate suppressed"); 246 q->q_flags |= a->q_flags; 247 } 248 else if (bitset(QSELFREF, q->q_flags)) 249 q->q_flags |= a->q_flags & ~QDONTSEND; 250 a = q; 251 goto testselfdestruct; 252 } 253 } 254 255 /* add address on list */ 256 *pq = a; 257 a->q_next = NULL; 258 259 /* 260 ** Alias the name and handle special mailer types. 261 */ 262 263 trylocaluser: 264 if (tTd(29, 7)) 265 printf("at trylocaluser %s\n", a->q_user); 266 267 if (bitset(QDONTSEND|QBADADDR|QVERIFIED, a->q_flags)) 268 goto testselfdestruct; 269 270 if (m == InclMailer) 271 { 272 a->q_flags |= QDONTSEND; 273 if (a->q_alias == NULL) 274 { 275 a->q_flags |= QBADADDR; 276 usrerr("550 Cannot mail directly to :include:s"); 277 } 278 else 279 { 280 int ret; 281 282 message("including file %s", a->q_user); 283 ret = include(a->q_user, FALSE, a, sendq, e); 284 if (transienterror(ret)) 285 { 286 #ifdef LOG 287 if (LogLevel > 2) 288 syslog(LOG_ERR, "%s: include %s: transient error: %s", 289 e->e_id == NULL ? "NOQUEUE" : e->e_id, 290 a->q_user, errstring(ret)); 291 #endif 292 a->q_flags |= QQUEUEUP; 293 a->q_flags &= ~QDONTSEND; 294 usrerr("451 Cannot open %s: %s", 295 a->q_user, errstring(ret)); 296 } 297 else if (ret != 0) 298 { 299 a->q_flags |= QBADADDR; 300 usrerr("550 Cannot open %s: %s", 301 a->q_user, errstring(ret)); 302 } 303 } 304 } 305 else if (m == FileMailer) 306 { 307 extern bool writable(); 308 309 /* check if writable or creatable */ 310 if (a->q_alias == NULL) 311 { 312 a->q_flags |= QBADADDR; 313 usrerr("550 Cannot mail directly to files"); 314 } 315 else if (bitset(QBOGUSSHELL, a->q_alias->q_flags)) 316 { 317 a->q_flags |= QBADADDR; 318 usrerr("550 User %s@%s doesn't have a valid shell for mailing to files", 319 a->q_alias->q_ruser, MyHostName); 320 } 321 else if (bitset(QUNSAFEADDR, a->q_alias->q_flags)) 322 { 323 a->q_flags |= QBADADDR; 324 usrerr("550 Address %s is unsafe for mailing to files", 325 a->q_alias->q_paddr); 326 } 327 else if (!writable(buf, getctladdr(a), SFF_ANYFILE)) 328 { 329 a->q_flags |= QBADADDR; 330 giveresponse(EX_CANTCREAT, m, NULL, a->q_alias, e); 331 } 332 } 333 334 /* try aliasing */ 335 if (!bitset(QDONTSEND, a->q_flags) && bitnset(M_ALIASABLE, m->m_flags)) 336 alias(a, sendq, e); 337 338 # ifdef USERDB 339 /* if not aliased, look it up in the user database */ 340 if (!bitset(QDONTSEND|QNOTREMOTE|QVERIFIED, a->q_flags) && 341 bitnset(M_CHECKUDB, m->m_flags)) 342 { 343 extern int udbexpand(); 344 345 if (udbexpand(a, sendq, e) == EX_TEMPFAIL) 346 { 347 a->q_flags |= QQUEUEUP; 348 if (e->e_message == NULL) 349 e->e_message = newstr("Deferred: user database error"); 350 # ifdef LOG 351 if (LogLevel > 8) 352 syslog(LOG_INFO, "%s: deferred: udbexpand: %s", 353 e->e_id == NULL ? "NOQUEUE" : e->e_id, 354 errstring(errno)); 355 # endif 356 message("queued (user database error): %s", 357 errstring(errno)); 358 e->e_nrcpts++; 359 goto testselfdestruct; 360 } 361 } 362 # endif 363 364 /* 365 ** If we have a level two config file, then pass the name through 366 ** Ruleset 5 before sending it off. Ruleset 5 has the right 367 ** to send rewrite it to another mailer. This gives us a hook 368 ** after local aliasing has been done. 369 */ 370 371 if (tTd(29, 5)) 372 { 373 printf("recipient: testing local? cl=%d, rr5=%x\n\t", 374 ConfigLevel, RewriteRules[5]); 375 printaddr(a, FALSE); 376 } 377 if (!bitset(QNOTREMOTE|QDONTSEND|QQUEUEUP|QVERIFIED, a->q_flags) && 378 ConfigLevel >= 2 && RewriteRules[5] != NULL && 379 bitnset(M_TRYRULESET5, m->m_flags)) 380 { 381 maplocaluser(a, sendq, e); 382 } 383 384 /* 385 ** If it didn't get rewritten to another mailer, go ahead 386 ** and deliver it. 387 */ 388 389 if (!bitset(QDONTSEND|QQUEUEUP|QVERIFIED, a->q_flags) && 390 bitnset(M_HASPWENT, m->m_flags)) 391 { 392 auto bool fuzzy; 393 register struct passwd *pw; 394 extern struct passwd *finduser(); 395 396 /* warning -- finduser may trash buf */ 397 pw = finduser(buf, &fuzzy); 398 if (pw == NULL) 399 { 400 a->q_flags |= QBADADDR; 401 giveresponse(EX_NOUSER, m, NULL, a->q_alias, e); 402 } 403 else 404 { 405 char nbuf[MAXNAME]; 406 407 if (fuzzy) 408 { 409 /* name was a fuzzy match */ 410 a->q_user = newstr(pw->pw_name); 411 if (findusercount++ > 3) 412 { 413 a->q_flags |= QBADADDR; 414 usrerr("554 aliasing/forwarding loop for %s broken", 415 pw->pw_name); 416 goto done; 417 } 418 419 /* see if it aliases */ 420 (void) strcpy(buf, pw->pw_name); 421 goto trylocaluser; 422 } 423 if (strcmp(pw->pw_dir, "/") == 0) 424 a->q_home = ""; 425 else 426 a->q_home = newstr(pw->pw_dir); 427 a->q_uid = pw->pw_uid; 428 a->q_gid = pw->pw_gid; 429 a->q_ruser = newstr(pw->pw_name); 430 a->q_flags |= QGOODUID; 431 buildfname(pw->pw_gecos, pw->pw_name, nbuf); 432 if (nbuf[0] != '\0') 433 a->q_fullname = newstr(nbuf); 434 if (pw->pw_shell != NULL && pw->pw_shell[0] != '\0' && 435 !usershellok(pw->pw_shell)) 436 { 437 a->q_flags |= QBOGUSSHELL; 438 } 439 if (!quoted) 440 forward(a, sendq, e); 441 } 442 } 443 if (!bitset(QDONTSEND, a->q_flags)) 444 e->e_nrcpts++; 445 446 testselfdestruct: 447 if (tTd(26, 8)) 448 { 449 printf("testselfdestruct: "); 450 printaddr(a, TRUE); 451 } 452 if (a->q_alias == NULL && a != &e->e_from && 453 bitset(QDONTSEND, a->q_flags)) 454 { 455 q = *sendq; 456 while (q != NULL && bitset(QDONTSEND, q->q_flags)) 457 q = q->q_next; 458 if (q == NULL) 459 { 460 a->q_flags |= QBADADDR; 461 usrerr("554 aliasing/forwarding loop broken"); 462 } 463 } 464 465 done: 466 if (buf != buf0) 467 free(buf); 468 return (a); 469 } 470 /* 471 ** FINDUSER -- find the password entry for a user. 472 ** 473 ** This looks a lot like getpwnam, except that it may want to 474 ** do some fancier pattern matching in /etc/passwd. 475 ** 476 ** This routine contains most of the time of many sendmail runs. 477 ** It deserves to be optimized. 478 ** 479 ** Parameters: 480 ** name -- the name to match against. 481 ** fuzzyp -- an outarg that is set to TRUE if this entry 482 ** was found using the fuzzy matching algorithm; 483 ** set to FALSE otherwise. 484 ** 485 ** Returns: 486 ** A pointer to a pw struct. 487 ** NULL if name is unknown or ambiguous. 488 ** 489 ** Side Effects: 490 ** may modify name. 491 */ 492 493 struct passwd * 494 finduser(name, fuzzyp) 495 char *name; 496 bool *fuzzyp; 497 { 498 register struct passwd *pw; 499 register char *p; 500 extern struct passwd *getpwent(); 501 extern struct passwd *getpwnam(); 502 503 if (tTd(29, 4)) 504 printf("finduser(%s): ", name); 505 506 *fuzzyp = FALSE; 507 508 /* DEC Hesiod getpwnam accepts numeric strings -- short circuit it */ 509 for (p = name; *p != '\0'; p++) 510 if (!isascii(*p) || !isdigit(*p)) 511 break; 512 if (*p == '\0') 513 { 514 if (tTd(29, 4)) 515 printf("failed (numeric input)\n"); 516 return NULL; 517 } 518 519 /* look up this login name using fast path */ 520 if ((pw = getpwnam(name)) != NULL) 521 { 522 if (tTd(29, 4)) 523 printf("found (non-fuzzy)\n"); 524 return (pw); 525 } 526 527 #ifdef MATCHGECOS 528 /* see if fuzzy matching allowed */ 529 if (!MatchGecos) 530 { 531 if (tTd(29, 4)) 532 printf("not found (fuzzy disabled)\n"); 533 return NULL; 534 } 535 536 /* search for a matching full name instead */ 537 for (p = name; *p != '\0'; p++) 538 { 539 if (*p == (SpaceSub & 0177) || *p == '_') 540 *p = ' '; 541 } 542 (void) setpwent(); 543 while ((pw = getpwent()) != NULL) 544 { 545 char buf[MAXNAME]; 546 547 buildfname(pw->pw_gecos, pw->pw_name, buf); 548 if (strchr(buf, ' ') != NULL && !strcasecmp(buf, name)) 549 { 550 if (tTd(29, 4)) 551 printf("fuzzy matches %s\n", pw->pw_name); 552 message("sending to login name %s", pw->pw_name); 553 *fuzzyp = TRUE; 554 return (pw); 555 } 556 } 557 if (tTd(29, 4)) 558 printf("no fuzzy match found\n"); 559 #else 560 if (tTd(29, 4)) 561 printf("not found (fuzzy disabled)\n"); 562 #endif 563 return (NULL); 564 } 565 /* 566 ** WRITABLE -- predicate returning if the file is writable. 567 ** 568 ** This routine must duplicate the algorithm in sys/fio.c. 569 ** Unfortunately, we cannot use the access call since we 570 ** won't necessarily be the real uid when we try to 571 ** actually open the file. 572 ** 573 ** Notice that ANY file with ANY execute bit is automatically 574 ** not writable. This is also enforced by mailfile. 575 ** 576 ** Parameters: 577 ** filename -- the file name to check. 578 ** ctladdr -- the controlling address for this file. 579 ** flags -- SFF_* flags to control the function. 580 ** 581 ** Returns: 582 ** TRUE -- if we will be able to write this file. 583 ** FALSE -- if we cannot write this file. 584 ** 585 ** Side Effects: 586 ** none. 587 */ 588 589 bool 590 writable(filename, ctladdr, flags) 591 char *filename; 592 ADDRESS *ctladdr; 593 int flags; 594 { 595 uid_t euid; 596 gid_t egid; 597 int bits; 598 register char *p; 599 char *uname; 600 struct stat stb; 601 extern char RealUserName[]; 602 603 if (tTd(29, 5)) 604 printf("writable(%s, %x)\n", filename, flags); 605 606 #ifdef HASLSTAT 607 if ((bitset(SFF_NOSLINK, flags) ? lstat(filename, &stb) 608 : stat(filename, &stb)) < 0) 609 #else 610 if (stat(filename, &stb) < 0) 611 #endif 612 { 613 /* file does not exist -- see if directory is safe */ 614 p = strrchr(filename, '/'); 615 if (p == NULL) 616 { 617 errno = ENOTDIR; 618 return FALSE; 619 } 620 *p = '\0'; 621 errno = safefile(filename, RealUid, RealGid, RealUserName, 622 SFF_MUSTOWN, S_IWRITE|S_IEXEC); 623 *p = '/'; 624 return errno == 0; 625 } 626 627 #ifdef SUID_ROOT_FILES_OK 628 /* really ought to be passed down -- and not a good idea */ 629 flags |= SFF_ROOTOK; 630 #endif 631 632 /* 633 ** File does exist -- check that it is writable. 634 */ 635 636 if (bitset(0111, stb.st_mode)) 637 { 638 if (tTd(29, 5)) 639 printf("failed (mode %o: x bits)\n", stb.st_mode); 640 errno = EPERM; 641 return (FALSE); 642 } 643 644 if (ctladdr != NULL && geteuid() == 0) 645 { 646 euid = ctladdr->q_uid; 647 egid = ctladdr->q_gid; 648 uname = ctladdr->q_user; 649 } 650 else 651 { 652 euid = RealUid; 653 egid = RealGid; 654 uname = RealUserName; 655 } 656 if (euid == 0) 657 { 658 euid = DefUid; 659 uname = DefUser; 660 } 661 if (egid == 0) 662 egid = DefGid; 663 if (geteuid() == 0) 664 { 665 if (bitset(S_ISUID, stb.st_mode) && 666 (stb.st_uid != 0 || bitset(SFF_ROOTOK, flags))) 667 { 668 euid = stb.st_uid; 669 uname = NULL; 670 } 671 if (bitset(S_ISGID, stb.st_mode) && 672 (stb.st_gid != 0 || bitset(SFF_ROOTOK, flags))) 673 egid = stb.st_gid; 674 } 675 676 if (tTd(29, 5)) 677 printf("\teu/gid=%d/%d, st_u/gid=%d/%d\n", 678 euid, egid, stb.st_uid, stb.st_gid); 679 680 errno = safefile(filename, euid, egid, uname, flags, S_IWRITE); 681 return errno == 0; 682 } 683 /* 684 ** INCLUDE -- handle :include: specification. 685 ** 686 ** Parameters: 687 ** fname -- filename to include. 688 ** forwarding -- if TRUE, we are reading a .forward file. 689 ** if FALSE, it's a :include: file. 690 ** ctladdr -- address template to use to fill in these 691 ** addresses -- effective user/group id are 692 ** the important things. 693 ** sendq -- a pointer to the head of the send queue 694 ** to put these addresses in. 695 ** 696 ** Returns: 697 ** open error status 698 ** 699 ** Side Effects: 700 ** reads the :include: file and sends to everyone 701 ** listed in that file. 702 ** 703 ** Security Note: 704 ** If you have restricted chown (that is, you can't 705 ** give a file away), it is reasonable to allow programs 706 ** and files called from this :include: file to be to be 707 ** run as the owner of the :include: file. This is bogus 708 ** if there is any chance of someone giving away a file. 709 ** We assume that pre-POSIX systems can give away files. 710 ** 711 ** There is an additional restriction that if you 712 ** forward to a :include: file, it will not take on 713 ** the ownership of the :include: file. This may not 714 ** be necessary, but shouldn't hurt. 715 */ 716 717 static jmp_buf CtxIncludeTimeout; 718 static int includetimeout(); 719 720 #ifndef S_IWOTH 721 # define S_IWOTH (S_IWRITE >> 6) 722 #endif 723 724 int 725 include(fname, forwarding, ctladdr, sendq, e) 726 char *fname; 727 bool forwarding; 728 ADDRESS *ctladdr; 729 ADDRESS **sendq; 730 ENVELOPE *e; 731 { 732 register FILE *fp = NULL; 733 char *oldto = e->e_to; 734 char *oldfilename = FileName; 735 int oldlinenumber = LineNumber; 736 register EVENT *ev = NULL; 737 int nincludes; 738 register ADDRESS *ca; 739 uid_t saveduid, uid; 740 gid_t savedgid, gid; 741 char *uname; 742 int rval = 0; 743 int sfflags = forwarding ? SFF_MUSTOWN : SFF_ANYFILE; 744 struct stat st; 745 char buf[MAXLINE]; 746 #ifdef _POSIX_CHOWN_RESTRICTED 747 # if _POSIX_CHOWN_RESTRICTED == -1 748 # define safechown FALSE 749 # else 750 # define safechown TRUE 751 # endif 752 #else 753 # ifdef _PC_CHOWN_RESTRICTED 754 bool safechown; 755 # else 756 # ifdef BSD 757 # define safechown TRUE 758 # else 759 # define safechown FALSE 760 # endif 761 # endif 762 #endif 763 extern bool chownsafe(); 764 765 if (tTd(27, 2)) 766 printf("include(%s)\n", fname); 767 if (tTd(27, 4)) 768 printf(" ruid=%d euid=%d\n", getuid(), geteuid()); 769 if (tTd(27, 14)) 770 { 771 printf("ctladdr "); 772 printaddr(ctladdr, FALSE); 773 } 774 775 if (tTd(27, 9)) 776 printf("include: old uid = %d/%d\n", getuid(), geteuid()); 777 778 ca = getctladdr(ctladdr); 779 if (ca == NULL) 780 { 781 uid = DefUid; 782 gid = DefGid; 783 uname = DefUser; 784 saveduid = -1; 785 } 786 else 787 { 788 uid = ca->q_uid; 789 gid = ca->q_gid; 790 uname = ca->q_user; 791 #ifdef HASSETREUID 792 saveduid = geteuid(); 793 savedgid = getegid(); 794 if (saveduid == 0) 795 { 796 initgroups(uname, gid); 797 if (uid != 0) 798 (void) setreuid(0, uid); 799 } 800 #endif 801 } 802 803 if (tTd(27, 9)) 804 printf("include: new uid = %d/%d\n", getuid(), geteuid()); 805 806 /* 807 ** If home directory is remote mounted but server is down, 808 ** this can hang or give errors; use a timeout to avoid this 809 */ 810 811 if (setjmp(CtxIncludeTimeout) != 0) 812 { 813 ctladdr->q_flags |= QQUEUEUP; 814 errno = 0; 815 816 /* return pseudo-error code */ 817 rval = EOPENTIMEOUT; 818 goto resetuid; 819 } 820 if (TimeOuts.to_fileopen > 0) 821 ev = setevent(TimeOuts.to_fileopen, includetimeout, 0); 822 else 823 ev = NULL; 824 825 /* the input file must be marked safe */ 826 rval = safefile(fname, uid, gid, uname, sfflags, S_IREAD); 827 if (rval != 0) 828 { 829 /* don't use this :include: file */ 830 if (tTd(27, 4)) 831 printf("include: not safe (uid=%d): %s\n", 832 uid, errstring(rval)); 833 } 834 else 835 { 836 fp = fopen(fname, "r"); 837 if (fp == NULL) 838 { 839 rval = errno; 840 if (tTd(27, 4)) 841 printf("include: open: %s\n", errstring(rval)); 842 } 843 } 844 if (ev != NULL) 845 clrevent(ev); 846 847 resetuid: 848 849 #ifdef HASSETREUID 850 if (saveduid == 0) 851 { 852 if (uid != 0) 853 if (setreuid(-1, 0) < 0 || setreuid(RealUid, 0) < 0) 854 syserr("setreuid(%d, 0) failure (real=%d, eff=%d)", 855 RealUid, getuid(), geteuid()); 856 setgid(savedgid); 857 } 858 #endif 859 860 if (tTd(27, 9)) 861 printf("include: reset uid = %d/%d\n", getuid(), geteuid()); 862 863 if (rval == EOPENTIMEOUT) 864 usrerr("451 open timeout on %s", fname); 865 866 if (fp == NULL) 867 return rval; 868 869 if (fstat(fileno(fp), &st) < 0) 870 { 871 rval = errno; 872 syserr("Cannot fstat %s!", fname); 873 return rval; 874 } 875 876 #ifndef safechown 877 safechown = chownsafe(fileno(fp)); 878 #endif 879 if (ca == NULL && safechown) 880 { 881 ctladdr->q_uid = st.st_uid; 882 ctladdr->q_gid = st.st_gid; 883 ctladdr->q_flags |= QGOODUID; 884 } 885 if (ca != NULL && ca->q_uid == st.st_uid) 886 { 887 /* optimization -- avoid getpwuid if we already have info */ 888 ctladdr->q_flags |= ca->q_flags & QBOGUSSHELL; 889 ctladdr->q_ruser = ca->q_ruser; 890 } 891 else 892 { 893 char *sh; 894 register struct passwd *pw; 895 896 sh = "/SENDMAIL/ANY/SHELL/"; 897 pw = getpwuid(st.st_uid); 898 if (pw != NULL) 899 { 900 ctladdr->q_ruser = newstr(pw->pw_name); 901 if (safechown) 902 sh = pw->pw_shell; 903 } 904 if (pw == NULL) 905 ctladdr->q_flags |= QBOGUSSHELL; 906 else if(!usershellok(sh)) 907 { 908 if (safechown) 909 ctladdr->q_flags |= QBOGUSSHELL; 910 else 911 ctladdr->q_flags |= QUNSAFEADDR; 912 } 913 } 914 915 if (bitset(EF_VRFYONLY, e->e_flags)) 916 { 917 /* don't do any more now */ 918 ctladdr->q_flags |= QVERIFIED; 919 e->e_nrcpts++; 920 xfclose(fp, "include", fname); 921 return rval; 922 } 923 924 /* 925 ** Check to see if some bad guy can write this file 926 ** 927 ** This should really do something clever with group 928 ** permissions; currently we just view world writable 929 ** as unsafe. Also, we don't check for writable 930 ** directories in the path. We've got to leave 931 ** something for the local sysad to do. 932 */ 933 934 if (bitset(S_IWOTH, st.st_mode)) 935 ctladdr->q_flags |= QUNSAFEADDR; 936 937 /* read the file -- each line is a comma-separated list. */ 938 FileName = fname; 939 LineNumber = 0; 940 ctladdr->q_flags &= ~QSELFREF; 941 nincludes = 0; 942 while (fgets(buf, sizeof buf, fp) != NULL) 943 { 944 register char *p = strchr(buf, '\n'); 945 946 LineNumber++; 947 if (p != NULL) 948 *p = '\0'; 949 if (buf[0] == '#' || buf[0] == '\0') 950 continue; 951 e->e_to = NULL; 952 message("%s to %s", 953 forwarding ? "forwarding" : "sending", buf); 954 #ifdef LOG 955 if (forwarding && LogLevel > 9) 956 syslog(LOG_INFO, "%s: forward %s => %s", 957 e->e_id == NULL ? "NOQUEUE" : e->e_id, 958 oldto, buf); 959 #endif 960 961 AliasLevel++; 962 nincludes += sendtolist(buf, ctladdr, sendq, e); 963 AliasLevel--; 964 } 965 966 if (ferror(fp) && tTd(27, 3)) 967 printf("include: read error: %s\n", errstring(errno)); 968 if (nincludes > 0 && !bitset(QSELFREF, ctladdr->q_flags)) 969 { 970 if (tTd(27, 5)) 971 { 972 printf("include: QDONTSEND "); 973 printaddr(ctladdr, FALSE); 974 } 975 ctladdr->q_flags |= QDONTSEND; 976 } 977 978 (void) xfclose(fp, "include", fname); 979 FileName = oldfilename; 980 LineNumber = oldlinenumber; 981 e->e_to = oldto; 982 return rval; 983 } 984 985 static 986 includetimeout() 987 { 988 longjmp(CtxIncludeTimeout, 1); 989 } 990 /* 991 ** SENDTOARGV -- send to an argument vector. 992 ** 993 ** Parameters: 994 ** argv -- argument vector to send to. 995 ** e -- the current envelope. 996 ** 997 ** Returns: 998 ** none. 999 ** 1000 ** Side Effects: 1001 ** puts all addresses on the argument vector onto the 1002 ** send queue. 1003 */ 1004 1005 sendtoargv(argv, e) 1006 register char **argv; 1007 register ENVELOPE *e; 1008 { 1009 register char *p; 1010 1011 while ((p = *argv++) != NULL) 1012 { 1013 (void) sendtolist(p, NULLADDR, &e->e_sendqueue, e); 1014 } 1015 } 1016 /* 1017 ** GETCTLADDR -- get controlling address from an address header. 1018 ** 1019 ** If none, get one corresponding to the effective userid. 1020 ** 1021 ** Parameters: 1022 ** a -- the address to find the controller of. 1023 ** 1024 ** Returns: 1025 ** the controlling address. 1026 ** 1027 ** Side Effects: 1028 ** none. 1029 */ 1030 1031 ADDRESS * 1032 getctladdr(a) 1033 register ADDRESS *a; 1034 { 1035 while (a != NULL && !bitset(QGOODUID, a->q_flags)) 1036 a = a->q_alias; 1037 return (a); 1038 } 1039