1 /* 2 ** Sendmail 3 ** Copyright (c) 1983 Eric P. Allman 4 ** Berkeley, California 5 ** 6 ** Copyright (c) 1983 Regents of the University of California. 7 ** All rights reserved. The Berkeley software License Agreement 8 ** specifies the terms and conditions for redistribution. 9 */ 10 11 #ifndef lint 12 static char SccsId[] = "@(#)recipient.c 5.3 (Berkeley) 06/08/85"; 13 #endif not lint 14 15 # include <pwd.h> 16 # include "sendmail.h" 17 # include <sys/stat.h> 18 19 /* 20 ** SENDTOLIST -- Designate a send list. 21 ** 22 ** The parameter is a comma-separated list of people to send to. 23 ** This routine arranges to send to all of them. 24 ** 25 ** Parameters: 26 ** list -- the send list. 27 ** ctladdr -- the address template for the person to 28 ** send to -- effective uid/gid are important. 29 ** This is typically the alias that caused this 30 ** expansion. 31 ** sendq -- a pointer to the head of a queue to put 32 ** these people into. 33 ** 34 ** Returns: 35 ** none 36 ** 37 ** Side Effects: 38 ** none. 39 */ 40 41 # define MAXRCRSN 10 42 43 sendtolist(list, ctladdr, sendq) 44 char *list; 45 ADDRESS *ctladdr; 46 ADDRESS **sendq; 47 { 48 register char *p; 49 register ADDRESS *al; /* list of addresses to send to */ 50 bool firstone; /* set on first address sent */ 51 bool selfref; /* set if this list includes ctladdr */ 52 char delimiter; /* the address delimiter */ 53 54 # ifdef DEBUG 55 if (tTd(25, 1)) 56 { 57 printf("sendto: %s\n ctladdr=", list); 58 printaddr(ctladdr, FALSE); 59 } 60 # endif DEBUG 61 62 /* heuristic to determine old versus new style addresses */ 63 if (ctladdr == NULL && 64 (index(list, ',') != NULL || index(list, ';') != NULL || 65 index(list, '<') != NULL || index(list, '(') != NULL)) 66 CurEnv->e_flags &= ~EF_OLDSTYLE; 67 delimiter = ' '; 68 if (!bitset(EF_OLDSTYLE, CurEnv->e_flags) || ctladdr != NULL) 69 delimiter = ','; 70 71 firstone = TRUE; 72 selfref = FALSE; 73 al = NULL; 74 75 for (p = list; *p != '\0'; ) 76 { 77 register ADDRESS *a; 78 extern char *DelimChar; /* defined in prescan */ 79 80 /* parse the address */ 81 while (isspace(*p) || *p == ',') 82 p++; 83 a = parseaddr(p, (ADDRESS *) NULL, 1, delimiter); 84 p = DelimChar; 85 if (a == NULL) 86 continue; 87 a->q_next = al; 88 a->q_alias = ctladdr; 89 90 /* see if this should be marked as a primary address */ 91 if (ctladdr == NULL || 92 (firstone && *p == '\0' && bitset(QPRIMARY, ctladdr->q_flags))) 93 a->q_flags |= QPRIMARY; 94 95 /* put on send queue or suppress self-reference */ 96 if (ctladdr != NULL && sameaddr(ctladdr, a)) 97 selfref = TRUE; 98 else 99 al = a; 100 firstone = FALSE; 101 } 102 103 /* if this alias doesn't include itself, delete ctladdr */ 104 if (!selfref && ctladdr != NULL) 105 ctladdr->q_flags |= QDONTSEND; 106 107 /* arrange to send to everyone on the local send list */ 108 while (al != NULL) 109 { 110 register ADDRESS *a = al; 111 extern ADDRESS *recipient(); 112 113 al = a->q_next; 114 a = recipient(a, sendq); 115 116 /* arrange to inherit full name */ 117 if (a->q_fullname == NULL && ctladdr != NULL) 118 a->q_fullname = ctladdr->q_fullname; 119 } 120 121 CurEnv->e_to = NULL; 122 } 123 /* 124 ** RECIPIENT -- Designate a message recipient 125 ** 126 ** Saves the named person for future mailing. 127 ** 128 ** Parameters: 129 ** a -- the (preparsed) address header for the recipient. 130 ** sendq -- a pointer to the head of a queue to put the 131 ** recipient in. Duplicate supression is done 132 ** in this queue. 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) 144 register ADDRESS *a; 145 register ADDRESS **sendq; 146 { 147 register ADDRESS *q; 148 ADDRESS **pq; 149 register struct mailer *m; 150 register char *p; 151 bool quoted = FALSE; /* set if the addr has a quote bit */ 152 char buf[MAXNAME]; /* unquoted image of the user name */ 153 extern ADDRESS *getctladdr(); 154 extern bool safefile(); 155 156 CurEnv->e_to = a->q_paddr; 157 m = a->q_mailer; 158 errno = 0; 159 # ifdef DEBUG 160 if (tTd(26, 1)) 161 { 162 printf("\nrecipient: "); 163 printaddr(a, FALSE); 164 } 165 # endif DEBUG 166 167 /* break aliasing loops */ 168 if (AliasLevel > MAXRCRSN) 169 { 170 usrerr("aliasing/forwarding loop broken"); 171 return (a); 172 } 173 174 /* 175 ** Finish setting up address structure. 176 */ 177 178 /* set the queue timeout */ 179 a->q_timeout = TimeOut; 180 181 /* map user & host to lower case if requested on non-aliases */ 182 if (a->q_alias == NULL) 183 loweraddr(a); 184 185 /* get unquoted user for file, program or user.name check */ 186 (void) strcpy(buf, a->q_user); 187 for (p = buf; *p != '\0' && !quoted; p++) 188 { 189 if (!isascii(*p) && (*p & 0377) != (SpaceSub & 0377)) 190 quoted = TRUE; 191 } 192 stripquotes(buf, TRUE); 193 194 /* do sickly crude mapping for program mailing, etc. */ 195 if (m == LocalMailer && buf[0] == '|') 196 { 197 a->q_mailer = m = ProgMailer; 198 a->q_user++; 199 if (a->q_alias == NULL && !tTd(0, 1) && !QueueRun && !ForceMail) 200 { 201 usrerr("Cannot mail directly to programs"); 202 a->q_flags |= QDONTSEND; 203 } 204 } 205 206 /* 207 ** Look up this person in the recipient list. 208 ** If they are there already, return, otherwise continue. 209 ** If the list is empty, just add it. Notice the cute 210 ** hack to make from addresses suppress things correctly: 211 ** the QDONTSEND bit will be set in the send list. 212 ** [Please note: the emphasis is on "hack."] 213 */ 214 215 for (pq = sendq; (q = *pq) != NULL; pq = &q->q_next) 216 { 217 if (!ForceMail && sameaddr(q, a)) 218 { 219 # ifdef DEBUG 220 if (tTd(26, 1)) 221 { 222 printf("%s in sendq: ", a->q_paddr); 223 printaddr(q, FALSE); 224 } 225 # endif DEBUG 226 if (!bitset(QDONTSEND, a->q_flags)) 227 message(Arpa_Info, "duplicate suppressed"); 228 if (!bitset(QPRIMARY, q->q_flags)) 229 q->q_flags |= a->q_flags; 230 return (q); 231 } 232 } 233 234 /* add address on list */ 235 *pq = a; 236 a->q_next = NULL; 237 238 /* 239 ** Alias the name and handle :include: specs. 240 */ 241 242 if (m == LocalMailer && !bitset(QDONTSEND, a->q_flags)) 243 { 244 if (strncmp(a->q_user, ":include:", 9) == 0) 245 { 246 a->q_flags |= QDONTSEND; 247 if (a->q_alias == NULL && !tTd(0, 1) && !QueueRun && !ForceMail) 248 usrerr("Cannot mail directly to :include:s"); 249 else 250 { 251 message(Arpa_Info, "including file %s", &a->q_user[9]); 252 include(&a->q_user[9], " sending", a, sendq); 253 } 254 } 255 else 256 alias(a, sendq); 257 } 258 259 /* 260 ** If the user is local and still being sent, verify that 261 ** the address is good. If it is, try to forward. 262 ** If the address is already good, we have a forwarding 263 ** loop. This can be broken by just sending directly to 264 ** the user (which is probably correct anyway). 265 */ 266 267 if (!bitset(QDONTSEND, a->q_flags) && m == LocalMailer) 268 { 269 struct stat stb; 270 extern bool writable(); 271 272 /* see if this is to a file */ 273 if (buf[0] == '/') 274 { 275 p = rindex(buf, '/'); 276 /* check if writable or creatable */ 277 if (a->q_alias == NULL && !tTd(0, 1) && !QueueRun && !ForceMail) 278 { 279 usrerr("Cannot mail directly to files"); 280 a->q_flags |= QDONTSEND; 281 } 282 else if ((stat(buf, &stb) >= 0) ? (!writable(&stb)) : 283 (*p = '\0', !safefile(buf, getruid(), S_IWRITE|S_IEXEC))) 284 { 285 a->q_flags |= QBADADDR; 286 giveresponse(EX_CANTCREAT, m, CurEnv); 287 } 288 } 289 else 290 { 291 register struct passwd *pw; 292 extern struct passwd *finduser(); 293 294 /* warning -- finduser may trash buf */ 295 pw = finduser(buf); 296 if (pw == NULL) 297 { 298 a->q_flags |= QBADADDR; 299 giveresponse(EX_NOUSER, m, CurEnv); 300 } 301 else 302 { 303 char nbuf[MAXNAME]; 304 305 if (strcmp(a->q_user, pw->pw_name) != 0) 306 { 307 a->q_user = newstr(pw->pw_name); 308 (void) strcpy(buf, pw->pw_name); 309 } 310 a->q_home = newstr(pw->pw_dir); 311 a->q_uid = pw->pw_uid; 312 a->q_gid = pw->pw_gid; 313 a->q_flags |= QGOODUID; 314 buildfname(pw->pw_gecos, pw->pw_name, nbuf); 315 if (nbuf[0] != '\0') 316 a->q_fullname = newstr(nbuf); 317 if (!quoted) 318 forward(a, sendq); 319 } 320 } 321 } 322 return (a); 323 } 324 /* 325 ** FINDUSER -- find the password entry for a user. 326 ** 327 ** This looks a lot like getpwnam, except that it may want to 328 ** do some fancier pattern matching in /etc/passwd. 329 ** 330 ** This routine contains most of the time of many sendmail runs. 331 ** It deserves to be optimized. 332 ** 333 ** Parameters: 334 ** name -- the name to match against. 335 ** 336 ** Returns: 337 ** A pointer to a pw struct. 338 ** NULL if name is unknown or ambiguous. 339 ** 340 ** Side Effects: 341 ** may modify name. 342 */ 343 344 struct passwd * 345 finduser(name) 346 char *name; 347 { 348 register struct passwd *pw; 349 register char *p; 350 extern struct passwd *getpwent(); 351 extern struct passwd *getpwnam(); 352 353 /* 354 ** Make name canonical. 355 */ 356 357 for (p = name; *p != '\0'; p++) 358 { 359 if (*p == (SpaceSub & 0177) || *p == '_') 360 *p = ' '; 361 } 362 363 /* look up this login name */ 364 if ((pw = getpwnam(name)) != NULL) 365 return (pw); 366 367 /* search for a matching full name instead */ 368 (void) setpwent(); 369 while ((pw = getpwent()) != NULL) 370 { 371 char buf[MAXNAME]; 372 extern bool sameword(); 373 374 if (strcmp(pw->pw_name, name) == 0) 375 return (pw); 376 buildfname(pw->pw_gecos, pw->pw_name, buf); 377 if (index(buf, ' ') != NULL && sameword(buf, name)) 378 { 379 message(Arpa_Info, "sending to login name %s", pw->pw_name); 380 return (pw); 381 } 382 } 383 return (NULL); 384 } 385 /* 386 ** WRITABLE -- predicate returning if the file is writable. 387 ** 388 ** This routine must duplicate the algorithm in sys/fio.c. 389 ** Unfortunately, we cannot use the access call since we 390 ** won't necessarily be the real uid when we try to 391 ** actually open the file. 392 ** 393 ** Notice that ANY file with ANY execute bit is automatically 394 ** not writable. This is also enforced by mailfile. 395 ** 396 ** Parameters: 397 ** s -- pointer to a stat struct for the file. 398 ** 399 ** Returns: 400 ** TRUE -- if we will be able to write this file. 401 ** FALSE -- if we cannot write this file. 402 ** 403 ** Side Effects: 404 ** none. 405 */ 406 407 bool 408 writable(s) 409 register struct stat *s; 410 { 411 int euid, egid; 412 int bits; 413 414 if (bitset(0111, s->st_mode)) 415 return (FALSE); 416 euid = getruid(); 417 egid = getrgid(); 418 if (geteuid() == 0) 419 { 420 if (bitset(S_ISUID, s->st_mode)) 421 euid = s->st_uid; 422 if (bitset(S_ISGID, s->st_mode)) 423 egid = s->st_gid; 424 } 425 426 if (euid == 0) 427 return (TRUE); 428 bits = S_IWRITE; 429 if (euid != s->st_uid) 430 { 431 bits >>= 3; 432 if (egid != s->st_gid) 433 bits >>= 3; 434 } 435 return ((s->st_mode & bits) != 0); 436 } 437 /* 438 ** INCLUDE -- handle :include: specification. 439 ** 440 ** Parameters: 441 ** fname -- filename to include. 442 ** msg -- message to print in verbose mode. 443 ** ctladdr -- address template to use to fill in these 444 ** addresses -- effective user/group id are 445 ** the important things. 446 ** sendq -- a pointer to the head of the send queue 447 ** to put these addresses in. 448 ** 449 ** Returns: 450 ** none. 451 ** 452 ** Side Effects: 453 ** reads the :include: file and sends to everyone 454 ** listed in that file. 455 */ 456 457 include(fname, msg, ctladdr, sendq) 458 char *fname; 459 char *msg; 460 ADDRESS *ctladdr; 461 ADDRESS **sendq; 462 { 463 char buf[MAXLINE]; 464 register FILE *fp; 465 char *oldto = CurEnv->e_to; 466 char *oldfilename = FileName; 467 int oldlinenumber = LineNumber; 468 469 fp = fopen(fname, "r"); 470 if (fp == NULL) 471 { 472 usrerr("Cannot open %s", fname); 473 return; 474 } 475 if (getctladdr(ctladdr) == NULL) 476 { 477 struct stat st; 478 479 if (fstat(fileno(fp), &st) < 0) 480 syserr("Cannot fstat %s!", fname); 481 ctladdr->q_uid = st.st_uid; 482 ctladdr->q_gid = st.st_gid; 483 ctladdr->q_flags |= QGOODUID; 484 } 485 486 /* read the file -- each line is a comma-separated list. */ 487 FileName = fname; 488 LineNumber = 0; 489 while (fgets(buf, sizeof buf, fp) != NULL) 490 { 491 register char *p = index(buf, '\n'); 492 493 if (p != NULL) 494 *p = '\0'; 495 if (buf[0] == '\0') 496 continue; 497 CurEnv->e_to = oldto; 498 message(Arpa_Info, "%s to %s", msg, buf); 499 AliasLevel++; 500 sendtolist(buf, ctladdr, sendq); 501 AliasLevel--; 502 } 503 504 (void) fclose(fp); 505 FileName = oldfilename; 506 LineNumber = oldlinenumber; 507 } 508 /* 509 ** SENDTOARGV -- send to an argument vector. 510 ** 511 ** Parameters: 512 ** argv -- argument vector to send to. 513 ** 514 ** Returns: 515 ** none. 516 ** 517 ** Side Effects: 518 ** puts all addresses on the argument vector onto the 519 ** send queue. 520 */ 521 522 sendtoargv(argv) 523 register char **argv; 524 { 525 register char *p; 526 extern bool sameword(); 527 528 while ((p = *argv++) != NULL) 529 { 530 if (argv[0] != NULL && argv[1] != NULL && sameword(argv[0], "at")) 531 { 532 char nbuf[MAXNAME]; 533 534 if (strlen(p) + strlen(argv[1]) + 2 > sizeof nbuf) 535 usrerr("address overflow"); 536 else 537 { 538 (void) strcpy(nbuf, p); 539 (void) strcat(nbuf, "@"); 540 (void) strcat(nbuf, argv[1]); 541 p = newstr(nbuf); 542 argv += 2; 543 } 544 } 545 sendtolist(p, (ADDRESS *) NULL, &CurEnv->e_sendqueue); 546 } 547 } 548 /* 549 ** GETCTLADDR -- get controlling address from an address header. 550 ** 551 ** If none, get one corresponding to the effective userid. 552 ** 553 ** Parameters: 554 ** a -- the address to find the controller of. 555 ** 556 ** Returns: 557 ** the controlling address. 558 ** 559 ** Side Effects: 560 ** none. 561 */ 562 563 ADDRESS * 564 getctladdr(a) 565 register ADDRESS *a; 566 { 567 while (a != NULL && !bitset(QGOODUID, a->q_flags)) 568 a = a->q_alias; 569 return (a); 570 } 571