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 8.42 (Berkeley) 01/31/94"; 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 char buf[MAXNAME]; /* unquoted image of the user name */ 155 extern int safefile(); 156 157 e->e_to = a->q_paddr; 158 m = a->q_mailer; 159 errno = 0; 160 if (tTd(26, 1)) 161 { 162 printf("\nrecipient: "); 163 printaddr(a, FALSE); 164 } 165 166 /* if this is primary, add it to the original recipient list */ 167 if (a->q_alias == NULL) 168 { 169 if (e->e_origrcpt == NULL) 170 e->e_origrcpt = a->q_paddr; 171 else if (e->e_origrcpt != a->q_paddr) 172 e->e_origrcpt = ""; 173 } 174 175 /* break aliasing loops */ 176 if (AliasLevel > MAXRCRSN) 177 { 178 usrerr("554 aliasing/forwarding loop broken"); 179 return (a); 180 } 181 182 /* 183 ** Finish setting up address structure. 184 */ 185 186 /* set the queue timeout */ 187 a->q_timeout = TimeOuts.to_q_return; 188 189 /* get unquoted user for file, program or user.name check */ 190 (void) strcpy(buf, a->q_user); 191 for (p = buf; *p != '\0' && !quoted; p++) 192 { 193 if (*p == '\\') 194 quoted = TRUE; 195 } 196 stripquotes(buf); 197 198 /* check for direct mailing to restricted mailers */ 199 if (m == ProgMailer) 200 { 201 if (a->q_alias == NULL) 202 { 203 a->q_flags |= QBADADDR; 204 usrerr("550 Cannot mail directly to programs"); 205 } 206 else if (bitset(QBOGUSSHELL, a->q_alias->q_flags)) 207 { 208 a->q_flags |= QBADADDR; 209 usrerr("550 User %s@%s doesn't have a valid shell for mailing to programs", 210 a->q_alias->q_ruser, MyHostName); 211 } 212 else if (bitset(QUNSAFEADDR, a->q_alias->q_flags)) 213 { 214 a->q_flags |= QBADADDR; 215 usrerr("550 Address %s is unsafe for mailing to programs", 216 a->q_alias->q_paddr); 217 } 218 } 219 220 /* 221 ** Look up this person in the recipient list. 222 ** If they are there already, return, otherwise continue. 223 ** If the list is empty, just add it. Notice the cute 224 ** hack to make from addresses suppress things correctly: 225 ** the QDONTSEND bit will be set in the send list. 226 ** [Please note: the emphasis is on "hack."] 227 */ 228 229 for (pq = sendq; (q = *pq) != NULL; pq = &q->q_next) 230 { 231 if (sameaddr(q, a)) 232 { 233 if (tTd(26, 1)) 234 { 235 printf("%s in sendq: ", a->q_paddr); 236 printaddr(q, FALSE); 237 } 238 if (!bitset(QPRIMARY, q->q_flags)) 239 { 240 if (!bitset(QDONTSEND, a->q_flags)) 241 message("duplicate suppressed"); 242 q->q_flags |= a->q_flags; 243 } 244 else if (bitset(QSELFREF, q->q_flags)) 245 q->q_flags |= a->q_flags & ~QDONTSEND; 246 a = q; 247 goto testselfdestruct; 248 } 249 } 250 251 /* add address on list */ 252 *pq = a; 253 a->q_next = NULL; 254 255 /* 256 ** Alias the name and handle special mailer types. 257 */ 258 259 trylocaluser: 260 if (tTd(29, 7)) 261 printf("at trylocaluser %s\n", a->q_user); 262 263 if (bitset(QDONTSEND|QBADADDR|QVERIFIED, a->q_flags)) 264 goto testselfdestruct; 265 266 if (m == InclMailer) 267 { 268 a->q_flags |= QDONTSEND; 269 if (a->q_alias == NULL) 270 { 271 a->q_flags |= QBADADDR; 272 usrerr("550 Cannot mail directly to :include:s"); 273 } 274 else 275 { 276 int ret; 277 278 message("including file %s", a->q_user); 279 ret = include(a->q_user, FALSE, a, sendq, e); 280 if (transienterror(ret)) 281 { 282 #ifdef LOG 283 if (LogLevel > 2) 284 syslog(LOG_ERR, "%s: include %s: transient error: %e", 285 e->e_id, a->q_user, errstring(ret)); 286 #endif 287 a->q_flags |= QQUEUEUP; 288 a->q_flags &= ~QDONTSEND; 289 usrerr("451 Cannot open %s: %s", 290 a->q_user, errstring(ret)); 291 } 292 else if (ret != 0) 293 { 294 a->q_flags |= QBADADDR; 295 usrerr("550 Cannot open %s: %s", 296 a->q_user, errstring(ret)); 297 } 298 } 299 } 300 else if (m == FileMailer) 301 { 302 extern bool writable(); 303 304 /* check if writable or creatable */ 305 if (a->q_alias == NULL) 306 { 307 a->q_flags |= QBADADDR; 308 usrerr("550 Cannot mail directly to files"); 309 } 310 else if (bitset(QBOGUSSHELL, a->q_alias->q_flags)) 311 { 312 a->q_flags |= QBADADDR; 313 usrerr("550 User %s@%s doesn't have a valid shell for mailing to files", 314 a->q_alias->q_ruser, MyHostName); 315 } 316 else if (bitset(QUNSAFEADDR, a->q_alias->q_flags)) 317 { 318 a->q_flags |= QBADADDR; 319 usrerr("550 Address %s is unsafe for mailing to files", 320 a->q_alias->q_paddr); 321 } 322 else if (!writable(buf, getctladdr(a), SFF_ANYFILE)) 323 { 324 a->q_flags |= QBADADDR; 325 giveresponse(EX_CANTCREAT, m, NULL, a->q_alias, e); 326 } 327 } 328 329 if (m != LocalMailer) 330 { 331 if (!bitset(QDONTSEND, a->q_flags)) 332 e->e_nrcpts++; 333 goto testselfdestruct; 334 } 335 336 /* try aliasing */ 337 alias(a, sendq, e); 338 339 # ifdef USERDB 340 /* if not aliased, look it up in the user database */ 341 if (!bitset(QDONTSEND|QNOTREMOTE|QVERIFIED, a->q_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, errstring(errno)); 354 # endif 355 message("queued (user database error): %s", 356 errstring(errno)); 357 e->e_nrcpts++; 358 goto testselfdestruct; 359 } 360 } 361 # endif 362 363 /* if it was an alias or a UDB expansion, just return now */ 364 if (bitset(QDONTSEND|QQUEUEUP|QVERIFIED, a->q_flags)) 365 goto testselfdestruct; 366 367 /* 368 ** If we have a level two config file, then pass the name through 369 ** Ruleset 5 before sending it off. Ruleset 5 has the right 370 ** to send rewrite it to another mailer. This gives us a hook 371 ** after local aliasing has been done. 372 */ 373 374 if (tTd(29, 5)) 375 { 376 printf("recipient: testing local? cl=%d, rr5=%x\n\t", 377 ConfigLevel, RewriteRules[5]); 378 printaddr(a, FALSE); 379 } 380 if (!bitset(QNOTREMOTE, a->q_flags) && ConfigLevel >= 2 && 381 RewriteRules[5] != NULL) 382 { 383 maplocaluser(a, sendq, e); 384 } 385 386 /* 387 ** If it didn't get rewritten to another mailer, go ahead 388 ** and deliver it. 389 */ 390 391 if (!bitset(QDONTSEND|QQUEUEUP, a->q_flags)) 392 { 393 auto bool fuzzy; 394 register struct passwd *pw; 395 extern struct passwd *finduser(); 396 397 /* warning -- finduser may trash buf */ 398 pw = finduser(buf, &fuzzy); 399 if (pw == NULL) 400 { 401 a->q_flags |= QBADADDR; 402 giveresponse(EX_NOUSER, m, NULL, a->q_alias, e); 403 } 404 else 405 { 406 char nbuf[MAXNAME]; 407 408 if (fuzzy) 409 { 410 /* name was a fuzzy match */ 411 a->q_user = newstr(pw->pw_name); 412 if (findusercount++ > 3) 413 { 414 a->q_flags |= QBADADDR; 415 usrerr("554 aliasing/forwarding loop for %s broken", 416 pw->pw_name); 417 return (a); 418 } 419 420 /* see if it aliases */ 421 (void) strcpy(buf, pw->pw_name); 422 goto trylocaluser; 423 } 424 if (strcmp(pw->pw_dir, "/") == 0) 425 a->q_home = ""; 426 else 427 a->q_home = newstr(pw->pw_dir); 428 a->q_uid = pw->pw_uid; 429 a->q_gid = pw->pw_gid; 430 a->q_ruser = newstr(pw->pw_name); 431 a->q_flags |= QGOODUID; 432 buildfname(pw->pw_gecos, pw->pw_name, nbuf); 433 if (nbuf[0] != '\0') 434 a->q_fullname = newstr(nbuf); 435 if (pw->pw_shell != NULL && pw->pw_shell[0] != '\0' && 436 !usershellok(pw->pw_shell)) 437 { 438 a->q_flags |= QBOGUSSHELL; 439 } 440 if (!quoted) 441 forward(a, sendq, e); 442 } 443 } 444 if (!bitset(QDONTSEND, a->q_flags)) 445 e->e_nrcpts++; 446 447 testselfdestruct: 448 if (tTd(26, 8)) 449 { 450 printf("testselfdestruct: "); 451 printaddr(a, TRUE); 452 } 453 if (a->q_alias == NULL && a != &e->e_from && 454 bitset(QDONTSEND, a->q_flags)) 455 { 456 q = *sendq; 457 while (q != NULL && bitset(QDONTSEND, q->q_flags)) 458 q = q->q_next; 459 if (q == NULL) 460 { 461 a->q_flags |= QBADADDR; 462 usrerr("554 aliasing/forwarding loop broken"); 463 } 464 } 465 return (a); 466 } 467 /* 468 ** FINDUSER -- find the password entry for a user. 469 ** 470 ** This looks a lot like getpwnam, except that it may want to 471 ** do some fancier pattern matching in /etc/passwd. 472 ** 473 ** This routine contains most of the time of many sendmail runs. 474 ** It deserves to be optimized. 475 ** 476 ** Parameters: 477 ** name -- the name to match against. 478 ** fuzzyp -- an outarg that is set to TRUE if this entry 479 ** was found using the fuzzy matching algorithm; 480 ** set to FALSE otherwise. 481 ** 482 ** Returns: 483 ** A pointer to a pw struct. 484 ** NULL if name is unknown or ambiguous. 485 ** 486 ** Side Effects: 487 ** may modify name. 488 */ 489 490 struct passwd * 491 finduser(name, fuzzyp) 492 char *name; 493 bool *fuzzyp; 494 { 495 register struct passwd *pw; 496 register char *p; 497 extern struct passwd *getpwent(); 498 extern struct passwd *getpwnam(); 499 500 if (tTd(29, 4)) 501 printf("finduser(%s): ", name); 502 503 *fuzzyp = FALSE; 504 505 /* DEC Hesiod getpwnam accepts numeric strings -- short circuit it */ 506 for (p = name; *p != '\0'; p++) 507 if (!isascii(*p) || !isdigit(*p)) 508 break; 509 if (*p == '\0') 510 { 511 if (tTd(29, 4)) 512 printf("failed (numeric input)\n"); 513 return NULL; 514 } 515 516 /* look up this login name using fast path */ 517 if ((pw = getpwnam(name)) != NULL) 518 { 519 if (tTd(29, 4)) 520 printf("found (non-fuzzy)\n"); 521 return (pw); 522 } 523 524 #ifdef MATCHGECOS 525 /* see if fuzzy matching allowed */ 526 if (!MatchGecos) 527 { 528 if (tTd(29, 4)) 529 printf("not found (fuzzy disabled)\n"); 530 return NULL; 531 } 532 533 /* search for a matching full name instead */ 534 for (p = name; *p != '\0'; p++) 535 { 536 if (*p == (SpaceSub & 0177) || *p == '_') 537 *p = ' '; 538 } 539 (void) setpwent(); 540 while ((pw = getpwent()) != NULL) 541 { 542 char buf[MAXNAME]; 543 544 buildfname(pw->pw_gecos, pw->pw_name, buf); 545 if (strchr(buf, ' ') != NULL && !strcasecmp(buf, name)) 546 { 547 if (tTd(29, 4)) 548 printf("fuzzy matches %s\n", pw->pw_name); 549 message("sending to login name %s", pw->pw_name); 550 *fuzzyp = TRUE; 551 return (pw); 552 } 553 } 554 if (tTd(29, 4)) 555 printf("no fuzzy match found\n"); 556 #else 557 if (tTd(29, 4)) 558 printf("not found (fuzzy disabled)\n"); 559 #endif 560 return (NULL); 561 } 562 /* 563 ** WRITABLE -- predicate returning if the file is writable. 564 ** 565 ** This routine must duplicate the algorithm in sys/fio.c. 566 ** Unfortunately, we cannot use the access call since we 567 ** won't necessarily be the real uid when we try to 568 ** actually open the file. 569 ** 570 ** Notice that ANY file with ANY execute bit is automatically 571 ** not writable. This is also enforced by mailfile. 572 ** 573 ** Parameters: 574 ** filename -- the file name to check. 575 ** ctladdr -- the controlling address for this file. 576 ** flags -- SFF_* flags to control the function. 577 ** 578 ** Returns: 579 ** TRUE -- if we will be able to write this file. 580 ** FALSE -- if we cannot write this file. 581 ** 582 ** Side Effects: 583 ** none. 584 */ 585 586 bool 587 writable(filename, ctladdr, flags) 588 char *filename; 589 ADDRESS *ctladdr; 590 int flags; 591 { 592 uid_t euid; 593 gid_t egid; 594 int bits; 595 register char *p; 596 char *uname; 597 struct stat stb; 598 extern char RealUserName[]; 599 600 if (tTd(29, 5)) 601 printf("writable(%s, %x)\n", filename, flags); 602 603 #ifdef HASLSTAT 604 if ((bitset(SFF_NOSLINK, flags) ? lstat(filename, &stb) 605 : stat(filename, &stb)) < 0) 606 #else 607 if (stat(filename, &stb) < 0) 608 #endif 609 { 610 /* file does not exist -- see if directory is safe */ 611 p = strrchr(filename, '/'); 612 if (p == NULL) 613 { 614 errno = ENOTDIR; 615 return FALSE; 616 } 617 *p = '\0'; 618 errno = safefile(filename, RealUid, RealGid, RealUserName, 619 SFF_MUSTOWN, S_IWRITE|S_IEXEC); 620 *p = '/'; 621 return errno == 0; 622 } 623 624 #ifdef SUID_ROOT_FILES_OK 625 /* really ought to be passed down -- and not a good idea */ 626 flags |= SFF_ROOTOK; 627 #endif 628 629 /* 630 ** File does exist -- check that it is writable. 631 */ 632 633 if (bitset(0111, stb.st_mode)) 634 { 635 if (tTd(29, 5)) 636 printf("failed (mode %o: x bits)\n", stb.st_mode); 637 errno = EPERM; 638 return (FALSE); 639 } 640 641 if (ctladdr != NULL && geteuid() == 0) 642 { 643 euid = ctladdr->q_uid; 644 egid = ctladdr->q_gid; 645 uname = ctladdr->q_user; 646 } 647 else 648 { 649 euid = RealUid; 650 egid = RealGid; 651 uname = RealUserName; 652 } 653 if (euid == 0) 654 { 655 euid = DefUid; 656 uname = DefUser; 657 } 658 if (egid == 0) 659 egid = DefGid; 660 if (geteuid() == 0) 661 { 662 if (bitset(S_ISUID, stb.st_mode) && 663 (stb.st_uid != 0 || bitset(SFF_ROOTOK, flags))) 664 { 665 euid = stb.st_uid; 666 uname = NULL; 667 } 668 if (bitset(S_ISGID, stb.st_mode) && 669 (stb.st_gid != 0 || bitset(SFF_ROOTOK, flags))) 670 egid = stb.st_gid; 671 } 672 673 if (tTd(29, 5)) 674 printf("\teu/gid=%d/%d, st_u/gid=%d/%d\n", 675 euid, egid, stb.st_uid, stb.st_gid); 676 677 errno = safefile(filename, euid, egid, uname, flags, S_IWRITE); 678 return errno == 0; 679 } 680 /* 681 ** INCLUDE -- handle :include: specification. 682 ** 683 ** Parameters: 684 ** fname -- filename to include. 685 ** forwarding -- if TRUE, we are reading a .forward file. 686 ** if FALSE, it's a :include: file. 687 ** ctladdr -- address template to use to fill in these 688 ** addresses -- effective user/group id are 689 ** the important things. 690 ** sendq -- a pointer to the head of the send queue 691 ** to put these addresses in. 692 ** 693 ** Returns: 694 ** open error status 695 ** 696 ** Side Effects: 697 ** reads the :include: file and sends to everyone 698 ** listed in that file. 699 ** 700 ** Security Note: 701 ** If you have restricted chown (that is, you can't 702 ** give a file away), it is reasonable to allow programs 703 ** and files called from this :include: file to be to be 704 ** run as the owner of the :include: file. This is bogus 705 ** if there is any chance of someone giving away a file. 706 ** We assume that pre-POSIX systems can give away files. 707 ** 708 ** There is an additional restriction that if you 709 ** forward to a :include: file, it will not take on 710 ** the ownership of the :include: file. This may not 711 ** be necessary, but shouldn't hurt. 712 */ 713 714 static jmp_buf CtxIncludeTimeout; 715 static int includetimeout(); 716 717 #ifndef S_IWOTH 718 # define S_IWOTH (S_IWRITE >> 6) 719 #endif 720 721 int 722 include(fname, forwarding, ctladdr, sendq, e) 723 char *fname; 724 bool forwarding; 725 ADDRESS *ctladdr; 726 ADDRESS **sendq; 727 ENVELOPE *e; 728 { 729 register FILE *fp = NULL; 730 char *oldto = e->e_to; 731 char *oldfilename = FileName; 732 int oldlinenumber = LineNumber; 733 register EVENT *ev = NULL; 734 int nincludes; 735 register ADDRESS *ca; 736 uid_t saveduid, uid; 737 gid_t savedgid, gid; 738 char *uname; 739 int rval = 0; 740 int sfflags = forwarding ? SFF_MUSTOWN : SFF_ANYFILE; 741 struct stat st; 742 char buf[MAXLINE]; 743 #ifdef _POSIX_CHOWN_RESTRICTED 744 # if _POSIX_CHOWN_RESTRICTED == -1 745 # define safechown FALSE 746 # else 747 # define safechown TRUE 748 # endif 749 #else 750 # ifdef _PC_CHOWN_RESTRICTED 751 bool safechown; 752 # else 753 # ifdef BSD 754 # define safechown TRUE 755 # else 756 # define safechown FALSE 757 # endif 758 # endif 759 #endif 760 extern bool chownsafe(); 761 762 if (tTd(27, 2)) 763 printf("include(%s)\n", fname); 764 if (tTd(27, 4)) 765 printf(" ruid=%d euid=%d\n", getuid(), geteuid()); 766 if (tTd(27, 14)) 767 { 768 printf("ctladdr "); 769 printaddr(ctladdr, FALSE); 770 } 771 772 if (tTd(27, 9)) 773 printf("include: old uid = %d/%d\n", getuid(), geteuid()); 774 775 ca = getctladdr(ctladdr); 776 if (ca == NULL) 777 { 778 uid = DefUid; 779 gid = DefGid; 780 uname = DefUser; 781 saveduid = -1; 782 } 783 else 784 { 785 uid = ca->q_uid; 786 gid = ca->q_gid; 787 uname = ca->q_user; 788 #ifdef HASSETREUID 789 saveduid = geteuid(); 790 savedgid = getegid(); 791 if (saveduid == 0) 792 { 793 initgroups(uname, gid); 794 if (uid != 0) 795 (void) setreuid(0, uid); 796 } 797 #endif 798 } 799 800 if (tTd(27, 9)) 801 printf("include: new uid = %d/%d\n", getuid(), geteuid()); 802 803 /* 804 ** If home directory is remote mounted but server is down, 805 ** this can hang or give errors; use a timeout to avoid this 806 */ 807 808 if (setjmp(CtxIncludeTimeout) != 0) 809 { 810 ctladdr->q_flags |= QQUEUEUP; 811 errno = 0; 812 813 /* return pseudo-error code */ 814 rval = EOPENTIMEOUT; 815 goto resetuid; 816 } 817 ev = setevent((time_t) 60, includetimeout, 0); 818 819 /* the input file must be marked safe */ 820 rval = safefile(fname, uid, gid, uname, sfflags, S_IREAD); 821 if (rval != 0) 822 { 823 /* don't use this :include: file */ 824 if (tTd(27, 4)) 825 printf("include: not safe (uid=%d): %s\n", 826 uid, errstring(rval)); 827 } 828 else 829 { 830 fp = fopen(fname, "r"); 831 if (fp == NULL) 832 { 833 rval = errno; 834 if (tTd(27, 4)) 835 printf("include: open: %s\n", errstring(rval)); 836 } 837 } 838 clrevent(ev); 839 840 resetuid: 841 842 #ifdef HASSETREUID 843 if (saveduid == 0) 844 { 845 if (uid != 0) 846 if (setreuid(-1, 0) < 0 || setreuid(RealUid, 0) < 0) 847 syserr("setreuid(%d, 0) failure (real=%d, eff=%d)", 848 RealUid, getuid(), geteuid()); 849 setgid(savedgid); 850 } 851 #endif 852 853 if (tTd(27, 9)) 854 printf("include: reset uid = %d/%d\n", getuid(), geteuid()); 855 856 if (rval == EOPENTIMEOUT) 857 usrerr("451 open timeout on %s", fname); 858 859 if (fp == NULL) 860 return rval; 861 862 if (fstat(fileno(fp), &st) < 0) 863 { 864 rval = errno; 865 syserr("Cannot fstat %s!", fname); 866 return rval; 867 } 868 869 #ifndef safechown 870 safechown = chownsafe(fileno(fp)); 871 #endif 872 if (ca == NULL && safechown) 873 { 874 ctladdr->q_uid = st.st_uid; 875 ctladdr->q_gid = st.st_gid; 876 ctladdr->q_flags |= QGOODUID; 877 } 878 if (ca != NULL && ca->q_uid == st.st_uid) 879 { 880 /* optimization -- avoid getpwuid if we already have info */ 881 ctladdr->q_flags |= ca->q_flags & QBOGUSSHELL; 882 ctladdr->q_ruser = ca->q_ruser; 883 } 884 else 885 { 886 char *sh; 887 register struct passwd *pw; 888 889 sh = "/SENDMAIL/ANY/SHELL/"; 890 pw = getpwuid(st.st_uid); 891 if (pw != NULL) 892 { 893 ctladdr->q_ruser = newstr(pw->pw_name); 894 if (safechown) 895 sh = pw->pw_shell; 896 } 897 if (pw == NULL) 898 ctladdr->q_flags |= QBOGUSSHELL; 899 else if(!usershellok(sh)) 900 { 901 if (safechown) 902 ctladdr->q_flags |= QBOGUSSHELL; 903 else 904 ctladdr->q_flags |= QUNSAFEADDR; 905 } 906 } 907 908 if (bitset(EF_VRFYONLY, e->e_flags)) 909 { 910 /* don't do any more now */ 911 ctladdr->q_flags |= QVERIFIED; 912 e->e_nrcpts++; 913 xfclose(fp, "include", fname); 914 return rval; 915 } 916 917 /* 918 ** Check to see if some bad guy can write this file 919 ** 920 ** This should really do something clever with group 921 ** permissions; currently we just view world writable 922 ** as unsafe. Also, we don't check for writable 923 ** directories in the path. We've got to leave 924 ** something for the local sysad to do. 925 */ 926 927 if (bitset(S_IWOTH, st.st_mode)) 928 ctladdr->q_flags |= QUNSAFEADDR; 929 930 /* read the file -- each line is a comma-separated list. */ 931 FileName = fname; 932 LineNumber = 0; 933 ctladdr->q_flags &= ~QSELFREF; 934 nincludes = 0; 935 while (fgets(buf, sizeof buf, fp) != NULL) 936 { 937 register char *p = strchr(buf, '\n'); 938 939 LineNumber++; 940 if (p != NULL) 941 *p = '\0'; 942 if (buf[0] == '#' || buf[0] == '\0') 943 continue; 944 e->e_to = NULL; 945 message("%s to %s", 946 forwarding ? "forwarding" : "sending", buf); 947 #ifdef LOG 948 if (forwarding && LogLevel > 9) 949 syslog(LOG_INFO, "%s: forward %s => %s", 950 e->e_id, oldto, buf); 951 #endif 952 953 AliasLevel++; 954 nincludes += sendtolist(buf, ctladdr, sendq, e); 955 AliasLevel--; 956 } 957 958 if (ferror(fp) && tTd(27, 3)) 959 printf("include: read error: %s\n", errstring(errno)); 960 if (nincludes > 0 && !bitset(QSELFREF, ctladdr->q_flags)) 961 { 962 if (tTd(27, 5)) 963 { 964 printf("include: QDONTSEND "); 965 printaddr(ctladdr, FALSE); 966 } 967 ctladdr->q_flags |= QDONTSEND; 968 } 969 970 (void) xfclose(fp, "include", fname); 971 FileName = oldfilename; 972 LineNumber = oldlinenumber; 973 e->e_to = oldto; 974 return rval; 975 } 976 977 static 978 includetimeout() 979 { 980 longjmp(CtxIncludeTimeout, 1); 981 } 982 /* 983 ** SENDTOARGV -- send to an argument vector. 984 ** 985 ** Parameters: 986 ** argv -- argument vector to send to. 987 ** e -- the current envelope. 988 ** 989 ** Returns: 990 ** none. 991 ** 992 ** Side Effects: 993 ** puts all addresses on the argument vector onto the 994 ** send queue. 995 */ 996 997 sendtoargv(argv, e) 998 register char **argv; 999 register ENVELOPE *e; 1000 { 1001 register char *p; 1002 1003 while ((p = *argv++) != NULL) 1004 { 1005 (void) sendtolist(p, NULLADDR, &e->e_sendqueue, e); 1006 } 1007 } 1008 /* 1009 ** GETCTLADDR -- get controlling address from an address header. 1010 ** 1011 ** If none, get one corresponding to the effective userid. 1012 ** 1013 ** Parameters: 1014 ** a -- the address to find the controller of. 1015 ** 1016 ** Returns: 1017 ** the controlling address. 1018 ** 1019 ** Side Effects: 1020 ** none. 1021 */ 1022 1023 ADDRESS * 1024 getctladdr(a) 1025 register ADDRESS *a; 1026 { 1027 while (a != NULL && !bitset(QGOODUID, a->q_flags)) 1028 a = a->q_alias; 1029 return (a); 1030 } 1031