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 5.8 (Berkeley) 10/23/86"; 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 a->q_flags |= QDONTSEND; 202 usrerr("Cannot mail directly to programs"); 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 CurEnv->e_nrcpts++; 238 239 /* 240 ** Alias the name and handle :include: specs. 241 */ 242 243 if (m == LocalMailer && !bitset(QDONTSEND, a->q_flags)) 244 { 245 if (strncmp(a->q_user, ":include:", 9) == 0) 246 { 247 a->q_flags |= QDONTSEND; 248 if (a->q_alias == NULL && !tTd(0, 1) && !QueueRun && !ForceMail) 249 usrerr("Cannot mail directly to :include:s"); 250 else 251 { 252 message(Arpa_Info, "including file %s", &a->q_user[9]); 253 include(&a->q_user[9], " sending", a, sendq); 254 } 255 } 256 else 257 alias(a, sendq); 258 } 259 260 /* 261 ** If the user is local and still being sent, verify that 262 ** the address is good. If it is, try to forward. 263 ** If the address is already good, we have a forwarding 264 ** loop. This can be broken by just sending directly to 265 ** the user (which is probably correct anyway). 266 */ 267 268 if (!bitset(QDONTSEND, a->q_flags) && m == LocalMailer) 269 { 270 struct stat stb; 271 extern bool writable(); 272 273 /* see if this is to a file */ 274 if (buf[0] == '/') 275 { 276 p = rindex(buf, '/'); 277 /* check if writable or creatable */ 278 if (a->q_alias == NULL && !tTd(0, 1) && !QueueRun && !ForceMail) 279 { 280 a->q_flags |= QDONTSEND; 281 usrerr("Cannot mail directly to files"); 282 } 283 else if ((stat(buf, &stb) >= 0) ? (!writable(&stb)) : 284 (*p = '\0', !safefile(buf, getruid(), S_IWRITE|S_IEXEC))) 285 { 286 a->q_flags |= QBADADDR; 287 giveresponse(EX_CANTCREAT, m, CurEnv); 288 } 289 } 290 else 291 { 292 register struct passwd *pw; 293 extern struct passwd *finduser(); 294 295 /* warning -- finduser may trash buf */ 296 pw = finduser(buf); 297 if (pw == NULL) 298 { 299 a->q_flags |= QBADADDR; 300 giveresponse(EX_NOUSER, m, CurEnv); 301 } 302 else 303 { 304 char nbuf[MAXNAME]; 305 306 if (strcmp(a->q_user, pw->pw_name) != 0) 307 { 308 a->q_user = newstr(pw->pw_name); 309 (void) strcpy(buf, pw->pw_name); 310 } 311 a->q_home = newstr(pw->pw_dir); 312 a->q_uid = pw->pw_uid; 313 a->q_gid = pw->pw_gid; 314 a->q_flags |= QGOODUID; 315 buildfname(pw->pw_gecos, pw->pw_name, nbuf); 316 if (nbuf[0] != '\0') 317 a->q_fullname = newstr(nbuf); 318 if (!quoted) 319 forward(a, sendq); 320 } 321 } 322 } 323 return (a); 324 } 325 /* 326 ** FINDUSER -- find the password entry for a user. 327 ** 328 ** This looks a lot like getpwnam, except that it may want to 329 ** do some fancier pattern matching in /etc/passwd. 330 ** 331 ** This routine contains most of the time of many sendmail runs. 332 ** It deserves to be optimized. 333 ** 334 ** Parameters: 335 ** name -- the name to match against. 336 ** 337 ** Returns: 338 ** A pointer to a pw struct. 339 ** NULL if name is unknown or ambiguous. 340 ** 341 ** Side Effects: 342 ** may modify name. 343 */ 344 345 struct passwd * 346 finduser(name) 347 char *name; 348 { 349 register struct passwd *pw; 350 register char *p; 351 extern struct passwd *getpwent(); 352 extern struct passwd *getpwnam(); 353 354 /* map upper => lower case */ 355 for (p = name; *p != '\0'; p++) 356 { 357 if (isascii(*p) && isupper(*p)) 358 *p = tolower(*p); 359 } 360 361 /* look up this login name using fast path */ 362 if ((pw = getpwnam(name)) != NULL) 363 return (pw); 364 365 /* search for a matching full name instead */ 366 for (p = name; *p != '\0'; p++) 367 { 368 if (*p == (SpaceSub & 0177) || *p == '_') 369 *p = ' '; 370 } 371 (void) setpwent(); 372 while ((pw = getpwent()) != NULL) 373 { 374 char buf[MAXNAME]; 375 extern bool sameword(); 376 377 buildfname(pw->pw_gecos, pw->pw_name, buf); 378 if (index(buf, ' ') != NULL && sameword(buf, name)) 379 { 380 message(Arpa_Info, "sending to login name %s", pw->pw_name); 381 return (pw); 382 } 383 } 384 return (NULL); 385 } 386 /* 387 ** WRITABLE -- predicate returning if the file is writable. 388 ** 389 ** This routine must duplicate the algorithm in sys/fio.c. 390 ** Unfortunately, we cannot use the access call since we 391 ** won't necessarily be the real uid when we try to 392 ** actually open the file. 393 ** 394 ** Notice that ANY file with ANY execute bit is automatically 395 ** not writable. This is also enforced by mailfile. 396 ** 397 ** Parameters: 398 ** s -- pointer to a stat struct for the file. 399 ** 400 ** Returns: 401 ** TRUE -- if we will be able to write this file. 402 ** FALSE -- if we cannot write this file. 403 ** 404 ** Side Effects: 405 ** none. 406 */ 407 408 bool 409 writable(s) 410 register struct stat *s; 411 { 412 int euid, egid; 413 int bits; 414 415 if (bitset(0111, s->st_mode)) 416 return (FALSE); 417 euid = getruid(); 418 egid = getrgid(); 419 if (geteuid() == 0) 420 { 421 if (bitset(S_ISUID, s->st_mode)) 422 euid = s->st_uid; 423 if (bitset(S_ISGID, s->st_mode)) 424 egid = s->st_gid; 425 } 426 427 if (euid == 0) 428 return (TRUE); 429 bits = S_IWRITE; 430 if (euid != s->st_uid) 431 { 432 bits >>= 3; 433 if (egid != s->st_gid) 434 bits >>= 3; 435 } 436 return ((s->st_mode & bits) != 0); 437 } 438 /* 439 ** INCLUDE -- handle :include: specification. 440 ** 441 ** Parameters: 442 ** fname -- filename to include. 443 ** msg -- message to print in verbose mode. 444 ** ctladdr -- address template to use to fill in these 445 ** addresses -- effective user/group id are 446 ** the important things. 447 ** sendq -- a pointer to the head of the send queue 448 ** to put these addresses in. 449 ** 450 ** Returns: 451 ** none. 452 ** 453 ** Side Effects: 454 ** reads the :include: file and sends to everyone 455 ** listed in that file. 456 */ 457 458 include(fname, msg, ctladdr, sendq) 459 char *fname; 460 char *msg; 461 ADDRESS *ctladdr; 462 ADDRESS **sendq; 463 { 464 char buf[MAXLINE]; 465 register FILE *fp; 466 char *oldto = CurEnv->e_to; 467 char *oldfilename = FileName; 468 int oldlinenumber = LineNumber; 469 470 fp = fopen(fname, "r"); 471 if (fp == NULL) 472 { 473 usrerr("Cannot open %s", fname); 474 return; 475 } 476 if (getctladdr(ctladdr) == NULL) 477 { 478 struct stat st; 479 480 if (fstat(fileno(fp), &st) < 0) 481 syserr("Cannot fstat %s!", fname); 482 ctladdr->q_uid = st.st_uid; 483 ctladdr->q_gid = st.st_gid; 484 ctladdr->q_flags |= QGOODUID; 485 } 486 487 /* read the file -- each line is a comma-separated list. */ 488 FileName = fname; 489 LineNumber = 0; 490 while (fgets(buf, sizeof buf, fp) != NULL) 491 { 492 register char *p = index(buf, '\n'); 493 494 if (p != NULL) 495 *p = '\0'; 496 if (buf[0] == '\0') 497 continue; 498 CurEnv->e_to = oldto; 499 message(Arpa_Info, "%s to %s", msg, buf); 500 AliasLevel++; 501 sendtolist(buf, ctladdr, sendq); 502 AliasLevel--; 503 } 504 505 (void) fclose(fp); 506 FileName = oldfilename; 507 LineNumber = oldlinenumber; 508 } 509 /* 510 ** SENDTOARGV -- send to an argument vector. 511 ** 512 ** Parameters: 513 ** argv -- argument vector to send to. 514 ** 515 ** Returns: 516 ** none. 517 ** 518 ** Side Effects: 519 ** puts all addresses on the argument vector onto the 520 ** send queue. 521 */ 522 523 sendtoargv(argv) 524 register char **argv; 525 { 526 register char *p; 527 extern bool sameword(); 528 529 while ((p = *argv++) != NULL) 530 { 531 if (argv[0] != NULL && argv[1] != NULL && sameword(argv[0], "at")) 532 { 533 char nbuf[MAXNAME]; 534 535 if (strlen(p) + strlen(argv[1]) + 2 > sizeof nbuf) 536 usrerr("address overflow"); 537 else 538 { 539 (void) strcpy(nbuf, p); 540 (void) strcat(nbuf, "@"); 541 (void) strcat(nbuf, argv[1]); 542 p = newstr(nbuf); 543 argv += 2; 544 } 545 } 546 sendtolist(p, (ADDRESS *) NULL, &CurEnv->e_sendqueue); 547 } 548 } 549 /* 550 ** GETCTLADDR -- get controlling address from an address header. 551 ** 552 ** If none, get one corresponding to the effective userid. 553 ** 554 ** Parameters: 555 ** a -- the address to find the controller of. 556 ** 557 ** Returns: 558 ** the controlling address. 559 ** 560 ** Side Effects: 561 ** none. 562 */ 563 564 ADDRESS * 565 getctladdr(a) 566 register ADDRESS *a; 567 { 568 while (a != NULL && !bitset(QGOODUID, a->q_flags)) 569 a = a->q_alias; 570 return (a); 571 } 572