1 /* 2 * Copyright (c) 1983 Eric P. Allman 3 * Copyright (c) 1988 Regents of the University of California. 4 * All rights reserved. 5 * 6 * %sccs.include.redist.c% 7 */ 8 9 #ifndef lint 10 static char sccsid[] = "@(#)recipient.c 6.21 (Berkeley) 03/01/93"; 11 #endif /* not lint */ 12 13 # include "sendmail.h" 14 # include <sys/stat.h> 15 # include <fcntl.h> 16 # include <pwd.h> 17 18 /* 19 ** SENDTOLIST -- Designate a send list. 20 ** 21 ** The parameter is a comma-separated list of people to send to. 22 ** This routine arranges to send to all of them. 23 ** 24 ** Parameters: 25 ** list -- the send list. 26 ** ctladdr -- the address template for the person to 27 ** send to -- effective uid/gid are important. 28 ** This is typically the alias that caused this 29 ** expansion. 30 ** sendq -- a pointer to the head of a queue to put 31 ** these people into. 32 ** e -- the envelope in which to add these recipients. 33 ** 34 ** Returns: 35 ** The number of addresses actually on the list. 36 ** 37 ** Side Effects: 38 ** none. 39 */ 40 41 # define MAXRCRSN 10 42 43 sendtolist(list, ctladdr, sendq, e) 44 char *list; 45 ADDRESS *ctladdr; 46 ADDRESS **sendq; 47 register ENVELOPE *e; 48 { 49 register char *p; 50 register ADDRESS *al; /* list of addresses to send to */ 51 bool firstone; /* set on first address sent */ 52 char delimiter; /* the address delimiter */ 53 int naddrs; 54 55 if (tTd(25, 1)) 56 { 57 printf("sendto: %s\n ctladdr=", list); 58 printaddr(ctladdr, FALSE); 59 } 60 61 /* heuristic to determine old versus new style addresses */ 62 if (ctladdr == NULL && 63 (strchr(list, ',') != NULL || strchr(list, ';') != NULL || 64 strchr(list, '<') != NULL || strchr(list, '(') != NULL)) 65 e->e_flags &= ~EF_OLDSTYLE; 66 delimiter = ' '; 67 if (!bitset(EF_OLDSTYLE, e->e_flags) || ctladdr != NULL) 68 delimiter = ','; 69 70 firstone = TRUE; 71 al = NULL; 72 naddrs = 0; 73 74 for (p = list; *p != '\0'; ) 75 { 76 auto char *delimptr; 77 register ADDRESS *a; 78 79 /* parse the address */ 80 while ((isascii(*p) && isspace(*p)) || *p == ',') 81 p++; 82 a = parseaddr(p, (ADDRESS *) NULL, 1, delimiter, &delimptr, e); 83 p = delimptr; 84 if (a == NULL) 85 continue; 86 a->q_next = al; 87 a->q_alias = ctladdr; 88 89 /* see if this should be marked as a primary address */ 90 if (ctladdr == NULL || 91 (firstone && *p == '\0' && bitset(QPRIMARY, ctladdr->q_flags))) 92 a->q_flags |= QPRIMARY; 93 94 if (ctladdr != NULL && sameaddr(ctladdr, a)) 95 ctladdr->q_flags |= QSELFREF; 96 al = a; 97 firstone = FALSE; 98 } 99 100 /* arrange to send to everyone on the local send list */ 101 while (al != NULL) 102 { 103 register ADDRESS *a = al; 104 extern ADDRESS *recipient(); 105 106 al = a->q_next; 107 a = recipient(a, sendq, e); 108 109 /* arrange to inherit full name */ 110 if (a->q_fullname == NULL && ctladdr != NULL) 111 a->q_fullname = ctladdr->q_fullname; 112 naddrs++; 113 } 114 115 e->e_to = NULL; 116 return (naddrs); 117 } 118 /* 119 ** RECIPIENT -- Designate a message recipient 120 ** 121 ** Saves the named person for future mailing. 122 ** 123 ** Parameters: 124 ** a -- the (preparsed) address header for the recipient. 125 ** sendq -- a pointer to the head of a queue to put the 126 ** recipient in. Duplicate supression is done 127 ** in this queue. 128 ** e -- the current envelope. 129 ** 130 ** Returns: 131 ** The actual address in the queue. This will be "a" if 132 ** the address is not a duplicate, else the original address. 133 ** 134 ** Side Effects: 135 ** none. 136 */ 137 138 extern ADDRESS *getctladdr(); 139 140 ADDRESS * 141 recipient(a, sendq, e) 142 register ADDRESS *a; 143 register ADDRESS **sendq; 144 register ENVELOPE *e; 145 { 146 register ADDRESS *q; 147 ADDRESS **pq; 148 register struct mailer *m; 149 register char *p; 150 bool quoted = FALSE; /* set if the addr has a quote bit */ 151 int findusercount = 0; 152 char buf[MAXNAME]; /* unquoted image of the user name */ 153 extern int safefile(); 154 155 e->e_to = a->q_paddr; 156 m = a->q_mailer; 157 errno = 0; 158 if (tTd(26, 1)) 159 { 160 printf("\nrecipient: "); 161 printaddr(a, FALSE); 162 } 163 164 /* break aliasing loops */ 165 if (AliasLevel > MAXRCRSN) 166 { 167 usrerr("554 aliasing/forwarding loop broken"); 168 return (a); 169 } 170 171 /* 172 ** Finish setting up address structure. 173 */ 174 175 /* set the queue timeout */ 176 a->q_timeout = TimeOut; 177 178 /* map user & host to lower case if requested on non-aliases */ 179 if (a->q_alias == NULL) 180 loweraddr(a); 181 182 /* get unquoted user for file, program or user.name check */ 183 (void) strcpy(buf, a->q_user); 184 for (p = buf; *p != '\0' && !quoted; p++) 185 { 186 if (*p == '\\') 187 quoted = TRUE; 188 } 189 stripquotes(buf); 190 191 /* check for direct mailing to restricted mailers */ 192 if (a->q_alias == NULL && m == ProgMailer) 193 { 194 a->q_flags |= QDONTSEND|QBADADDR; 195 usrerr("550 Cannot mail directly to programs", m->m_name); 196 } 197 198 /* 199 ** Look up this person in the recipient list. 200 ** If they are there already, return, otherwise continue. 201 ** If the list is empty, just add it. Notice the cute 202 ** hack to make from addresses suppress things correctly: 203 ** the QDONTSEND bit will be set in the send list. 204 ** [Please note: the emphasis is on "hack."] 205 */ 206 207 for (pq = sendq; (q = *pq) != NULL; pq = &q->q_next) 208 { 209 if (sameaddr(q, a)) 210 { 211 if (tTd(26, 1)) 212 { 213 printf("%s in sendq: ", a->q_paddr); 214 printaddr(q, FALSE); 215 } 216 if (!bitset(QPRIMARY, q->q_flags)) 217 { 218 if (!bitset(QDONTSEND, a->q_flags)) 219 message("duplicate suppressed"); 220 q->q_flags |= a->q_flags; 221 } 222 return (q); 223 } 224 } 225 226 /* add address on list */ 227 *pq = a; 228 a->q_next = NULL; 229 230 /* 231 ** Alias the name and handle special mailer types. 232 */ 233 234 trylocaluser: 235 if (tTd(29, 7)) 236 printf("at trylocaluser %s\n", a->q_user); 237 238 if (bitset(QDONTSEND|QVERIFIED, a->q_flags)) 239 return (a); 240 241 if (m == InclMailer) 242 { 243 a->q_flags |= QDONTSEND; 244 if (a->q_alias == NULL) 245 { 246 a->q_flags |= QBADADDR; 247 usrerr("550 Cannot mail directly to :include:s"); 248 } 249 else 250 { 251 int err; 252 253 message("including file %s", a->q_user); 254 err = include(a->q_user, FALSE, a, sendq, e); 255 if (transienterror(err)) 256 a->q_flags |= QQUEUEUP|QDONTSEND; 257 } 258 } 259 else if (m == FileMailer) 260 { 261 struct stat stb; 262 extern bool writable(); 263 264 p = strrchr(buf, '/'); 265 /* check if writable or creatable */ 266 if (a->q_alias == NULL && !QueueRun) 267 { 268 a->q_flags |= QDONTSEND|QBADADDR; 269 usrerr("550 Cannot mail directly to files"); 270 } 271 else if ((stat(buf, &stb) >= 0) ? (!writable(&stb)) : 272 (*p = '\0', safefile(buf, getruid(), S_IWRITE|S_IEXEC) != 0)) 273 { 274 a->q_flags |= QBADADDR; 275 giveresponse(EX_CANTCREAT, m, e); 276 } 277 } 278 279 if (m != LocalMailer) 280 { 281 if (!bitset(QDONTSEND, a->q_flags)) 282 e->e_nrcpts++; 283 return (a); 284 } 285 286 /* try aliasing */ 287 alias(a, sendq, e); 288 289 # ifdef USERDB 290 /* if not aliased, look it up in the user database */ 291 if (!bitset(QDONTSEND|QNOTREMOTE, a->q_flags)) 292 { 293 extern int udbexpand(); 294 295 if (udbexpand(a, sendq, e) == EX_TEMPFAIL) 296 { 297 a->q_flags |= QQUEUEUP|QDONTSEND; 298 if (e->e_message == NULL) 299 e->e_message = newstr("Deferred: user database error"); 300 # ifdef LOG 301 if (LogLevel > 8) 302 syslog(LOG_INFO, "%s: deferred: udbexpand", 303 e->e_id); 304 # endif 305 message("queued (user database error)"); 306 e->e_nrcpts++; 307 return (a); 308 } 309 } 310 # endif 311 312 /* if it was an alias or a UDB expansion, just return now */ 313 if (bitset(QDONTSEND|QQUEUEUP|QVERIFIED, a->q_flags)) 314 return (a); 315 316 /* 317 ** If we have a level two config file, then pass the name through 318 ** Ruleset 5 before sending it off. Ruleset 5 has the right 319 ** to send rewrite it to another mailer. This gives us a hook 320 ** after local aliasing has been done. 321 */ 322 323 if (tTd(29, 5)) 324 { 325 printf("recipient: testing local? cl=%d, rr5=%x\n\t", 326 ConfigLevel, RewriteRules[5]); 327 printaddr(a, FALSE); 328 } 329 if (!bitset(QNOTREMOTE, a->q_flags) && ConfigLevel >= 2 && 330 RewriteRules[5] != NULL) 331 { 332 maplocaluser(a, sendq, e); 333 } 334 335 /* 336 ** If it didn't get rewritten to another mailer, go ahead 337 ** and deliver it. 338 */ 339 340 if (!bitset(QDONTSEND|QQUEUEUP, a->q_flags)) 341 { 342 auto bool fuzzy; 343 register struct passwd *pw; 344 extern struct passwd *finduser(); 345 346 /* warning -- finduser may trash buf */ 347 pw = finduser(buf, &fuzzy); 348 if (pw == NULL) 349 { 350 a->q_flags |= QBADADDR; 351 giveresponse(EX_NOUSER, m, e); 352 } 353 else 354 { 355 char nbuf[MAXNAME]; 356 357 if (fuzzy) 358 { 359 /* name was a fuzzy match */ 360 a->q_user = newstr(pw->pw_name); 361 if (findusercount++ > 3) 362 { 363 usrerr("554 aliasing/forwarding loop for %s broken", 364 pw->pw_name); 365 return (a); 366 } 367 368 /* see if it aliases */ 369 (void) strcpy(buf, pw->pw_name); 370 goto trylocaluser; 371 } 372 a->q_home = newstr(pw->pw_dir); 373 a->q_uid = pw->pw_uid; 374 a->q_gid = pw->pw_gid; 375 a->q_flags |= QGOODUID; 376 buildfname(pw->pw_gecos, pw->pw_name, nbuf); 377 if (nbuf[0] != '\0') 378 a->q_fullname = newstr(nbuf); 379 if (!quoted) 380 forward(a, sendq, e); 381 } 382 } 383 if (!bitset(QDONTSEND, a->q_flags)) 384 e->e_nrcpts++; 385 return (a); 386 } 387 /* 388 ** FINDUSER -- find the password entry for a user. 389 ** 390 ** This looks a lot like getpwnam, except that it may want to 391 ** do some fancier pattern matching in /etc/passwd. 392 ** 393 ** This routine contains most of the time of many sendmail runs. 394 ** It deserves to be optimized. 395 ** 396 ** Parameters: 397 ** name -- the name to match against. 398 ** fuzzyp -- an outarg that is set to TRUE if this entry 399 ** was found using the fuzzy matching algorithm; 400 ** set to FALSE otherwise. 401 ** 402 ** Returns: 403 ** A pointer to a pw struct. 404 ** NULL if name is unknown or ambiguous. 405 ** 406 ** Side Effects: 407 ** may modify name. 408 */ 409 410 struct passwd * 411 finduser(name, fuzzyp) 412 char *name; 413 bool *fuzzyp; 414 { 415 register struct passwd *pw; 416 register char *p; 417 extern struct passwd *getpwent(); 418 extern struct passwd *getpwnam(); 419 420 if (tTd(29, 4)) 421 printf("finduser(%s): ", name); 422 423 /* map upper => lower case */ 424 for (p = name; *p != '\0'; p++) 425 { 426 if (isascii(*p) && isupper(*p)) 427 *p = tolower(*p); 428 } 429 *fuzzyp = FALSE; 430 431 /* look up this login name using fast path */ 432 if ((pw = getpwnam(name)) != NULL) 433 { 434 if (tTd(29, 4)) 435 printf("found (non-fuzzy)\n"); 436 return (pw); 437 } 438 439 #ifdef MATCHGECOS 440 /* see if fuzzy matching allowed */ 441 if (!MatchGecos) 442 { 443 if (tTd(29, 4)) 444 printf("not found (fuzzy disabled)\n"); 445 return NULL; 446 } 447 448 /* search for a matching full name instead */ 449 for (p = name; *p != '\0'; p++) 450 { 451 if (*p == (SpaceSub & 0177) || *p == '_') 452 *p = ' '; 453 } 454 (void) setpwent(); 455 while ((pw = getpwent()) != NULL) 456 { 457 char buf[MAXNAME]; 458 459 buildfname(pw->pw_gecos, pw->pw_name, buf); 460 if (strchr(buf, ' ') != NULL && !strcasecmp(buf, name)) 461 { 462 if (tTd(29, 4)) 463 printf("fuzzy matches %s\n", pw->pw_name); 464 message("sending to login name %s", pw->pw_name); 465 *fuzzyp = TRUE; 466 return (pw); 467 } 468 } 469 #endif 470 if (tTd(29, 4)) 471 printf("no fuzzy match found\n"); 472 return (NULL); 473 } 474 /* 475 ** WRITABLE -- predicate returning if the file is writable. 476 ** 477 ** This routine must duplicate the algorithm in sys/fio.c. 478 ** Unfortunately, we cannot use the access call since we 479 ** won't necessarily be the real uid when we try to 480 ** actually open the file. 481 ** 482 ** Notice that ANY file with ANY execute bit is automatically 483 ** not writable. This is also enforced by mailfile. 484 ** 485 ** Parameters: 486 ** s -- pointer to a stat struct for the file. 487 ** 488 ** Returns: 489 ** TRUE -- if we will be able to write this file. 490 ** FALSE -- if we cannot write this file. 491 ** 492 ** Side Effects: 493 ** none. 494 */ 495 496 bool 497 writable(s) 498 register struct stat *s; 499 { 500 uid_t euid; 501 gid_t egid; 502 int bits; 503 504 if (bitset(0111, s->st_mode)) 505 return (FALSE); 506 euid = getruid(); 507 egid = getrgid(); 508 if (geteuid() == 0) 509 { 510 if (bitset(S_ISUID, s->st_mode)) 511 euid = s->st_uid; 512 if (bitset(S_ISGID, s->st_mode)) 513 egid = s->st_gid; 514 } 515 516 if (euid == 0) 517 return (TRUE); 518 bits = S_IWRITE; 519 if (euid != s->st_uid) 520 { 521 bits >>= 3; 522 if (egid != s->st_gid) 523 bits >>= 3; 524 } 525 return ((s->st_mode & bits) != 0); 526 } 527 /* 528 ** INCLUDE -- handle :include: specification. 529 ** 530 ** Parameters: 531 ** fname -- filename to include. 532 ** forwarding -- if TRUE, we are reading a .forward file. 533 ** if FALSE, it's a :include: file. 534 ** ctladdr -- address template to use to fill in these 535 ** addresses -- effective user/group id are 536 ** the important things. 537 ** sendq -- a pointer to the head of the send queue 538 ** to put these addresses in. 539 ** 540 ** Returns: 541 ** open error status 542 ** 543 ** Side Effects: 544 ** reads the :include: file and sends to everyone 545 ** listed in that file. 546 */ 547 548 static jmp_buf CtxIncludeTimeout; 549 550 int 551 include(fname, forwarding, ctladdr, sendq, e) 552 char *fname; 553 bool forwarding; 554 ADDRESS *ctladdr; 555 ADDRESS **sendq; 556 ENVELOPE *e; 557 { 558 register FILE *fp; 559 char *oldto = e->e_to; 560 char *oldfilename = FileName; 561 int oldlinenumber = LineNumber; 562 register EVENT *ev = NULL; 563 int nincludes; 564 int ret; 565 char buf[MAXLINE]; 566 static int includetimeout(); 567 568 if (tTd(27, 2)) 569 printf("include(%s)\n", fname); 570 571 /* 572 ** If home directory is remote mounted but server is down, 573 ** this can hang or give errors; use a timeout to avoid this 574 */ 575 576 if (setjmp(CtxIncludeTimeout) != 0) 577 { 578 ctladdr->q_flags |= QQUEUEUP|QDONTSEND; 579 errno = 0; 580 usrerr("451 open timeout on %s", fname); 581 return ETIMEDOUT; 582 } 583 ev = setevent((time_t) 60, includetimeout, 0); 584 585 /* if forwarding, the input file must be marked safe */ 586 if (forwarding && (ret = safefile(fname, ctladdr->q_uid, S_IREAD)) != 0) 587 { 588 /* don't use this .forward file */ 589 clrevent(ev); 590 if (tTd(27, 4)) 591 printf("include: not safe (uid=%d): %s\n", 592 ctladdr->q_uid, errstring(ret)); 593 return ret; 594 } 595 596 fp = fopen(fname, "r"); 597 if (fp == NULL) 598 { 599 int ret = errno; 600 601 clrevent(ev); 602 usrerr("550 Cannot open %s", fname); 603 return ret; 604 } 605 606 if (getctladdr(ctladdr) == NULL) 607 { 608 struct stat st; 609 610 if (fstat(fileno(fp), &st) < 0) 611 { 612 int ret = errno; 613 614 clrevent(ev); 615 syserr("Cannot fstat %s!", fname); 616 return ret; 617 } 618 ctladdr->q_uid = st.st_uid; 619 ctladdr->q_gid = st.st_gid; 620 ctladdr->q_flags |= QGOODUID; 621 } 622 623 clrevent(ev); 624 625 if (bitset(EF_VRFYONLY, e->e_flags)) 626 { 627 /* don't do any more now */ 628 fclose(fp); 629 return 0; 630 } 631 632 /* read the file -- each line is a comma-separated list. */ 633 FileName = fname; 634 LineNumber = 0; 635 ctladdr->q_flags &= ~QSELFREF; 636 nincludes = 0; 637 while (fgets(buf, sizeof buf, fp) != NULL) 638 { 639 register char *p = strchr(buf, '\n'); 640 641 LineNumber++; 642 if (p != NULL) 643 *p = '\0'; 644 if (buf[0] == '#' || buf[0] == '\0') 645 continue; 646 e->e_to = NULL; 647 message("%s to %s", 648 forwarding ? "forwarding" : "sending", buf); 649 #ifdef LOG 650 if (forwarding && LogLevel > 9) 651 syslog(LOG_INFO, "%s: forward %s => %s", 652 e->e_id, oldto, buf); 653 #endif 654 655 AliasLevel++; 656 nincludes += sendtolist(buf, ctladdr, sendq, e); 657 AliasLevel--; 658 } 659 if (nincludes > 0 && !bitset(QSELFREF, ctladdr->q_flags)) 660 { 661 if (tTd(27, 5)) 662 { 663 printf("include: QDONTSEND "); 664 printaddr(ctladdr, FALSE); 665 } 666 ctladdr->q_flags |= QDONTSEND; 667 } 668 669 (void) fclose(fp); 670 FileName = oldfilename; 671 LineNumber = oldlinenumber; 672 return 0; 673 } 674 675 static 676 includetimeout() 677 { 678 longjmp(CtxIncludeTimeout, 1); 679 } 680 /* 681 ** SENDTOARGV -- send to an argument vector. 682 ** 683 ** Parameters: 684 ** argv -- argument vector to send to. 685 ** e -- the current envelope. 686 ** 687 ** Returns: 688 ** none. 689 ** 690 ** Side Effects: 691 ** puts all addresses on the argument vector onto the 692 ** send queue. 693 */ 694 695 sendtoargv(argv, e) 696 register char **argv; 697 register ENVELOPE *e; 698 { 699 register char *p; 700 701 while ((p = *argv++) != NULL) 702 { 703 if (argv[0] != NULL && argv[1] != NULL && !strcasecmp(argv[0], "at")) 704 { 705 char nbuf[MAXNAME]; 706 707 if (strlen(p) + strlen(argv[1]) + 2 > sizeof nbuf) 708 usrerr("554 address overflow"); 709 else 710 { 711 (void) strcpy(nbuf, p); 712 (void) strcat(nbuf, "@"); 713 (void) strcat(nbuf, argv[1]); 714 p = newstr(nbuf); 715 argv += 2; 716 } 717 } 718 (void) sendtolist(p, (ADDRESS *) NULL, &e->e_sendqueue, e); 719 } 720 } 721 /* 722 ** GETCTLADDR -- get controlling address from an address header. 723 ** 724 ** If none, get one corresponding to the effective userid. 725 ** 726 ** Parameters: 727 ** a -- the address to find the controller of. 728 ** 729 ** Returns: 730 ** the controlling address. 731 ** 732 ** Side Effects: 733 ** none. 734 */ 735 736 ADDRESS * 737 getctladdr(a) 738 register ADDRESS *a; 739 { 740 while (a != NULL && !bitset(QGOODUID, a->q_flags)) 741 a = a->q_alias; 742 return (a); 743 } 744