1 # include <pwd.h> 2 # include "sendmail.h" 3 # include <sys/stat.h> 4 5 SCCSID(@(#)recipient.c 3.41 09/12/82); 6 7 /* 8 ** SENDTO -- Designate a send list. 9 ** 10 ** The parameter is a comma-separated list of people to send to. 11 ** This routine arranges to send to all of them. 12 ** 13 ** Parameters: 14 ** list -- the send list. 15 ** ctladdr -- the address template for the person to 16 ** send to -- effective uid/gid are important. 17 ** This is typically the alias that caused this 18 ** expansion. 19 ** sendq -- a pointer to the head of a queue to put 20 ** these people into. 21 ** 22 ** Returns: 23 ** none 24 ** 25 ** Side Effects: 26 ** none. 27 */ 28 29 # define MAXRCRSN 10 30 31 sendto(list, ctladdr, sendq) 32 char *list; 33 ADDRESS *ctladdr; 34 ADDRESS **sendq; 35 { 36 register char *p; 37 register ADDRESS *al; /* list of addresses to send to */ 38 bool firstone; /* set on first address sent */ 39 bool selfref; /* set if this list includes ctladdr */ 40 41 # ifdef DEBUG 42 if (tTd(25, 1)) 43 { 44 printf("sendto: %s\n ctladdr=", list); 45 printaddr(ctladdr, FALSE); 46 } 47 # endif DEBUG 48 49 /* heuristic to determine old versus new style addresses */ 50 if (index(list, ',') != NULL || index(list, ';') != NULL || 51 index(list, '<') != NULL || index(list, '(') != NULL) 52 CurEnv->e_oldstyle = FALSE; 53 54 firstone = TRUE; 55 selfref = FALSE; 56 al = NULL; 57 58 for (p = list; *p != '\0'; ) 59 { 60 register ADDRESS *a; 61 extern char *DelimChar; /* defined in prescan */ 62 63 /* parse the address */ 64 while (isspace(*p) || *p == ',') 65 p++; 66 if ((a = parse(p, (ADDRESS *) NULL, 1)) == NULL) 67 continue; 68 p = DelimChar; 69 a->q_next = al; 70 a->q_alias = ctladdr; 71 72 /* see if this should be marked as a primary address */ 73 if (ctladdr == NULL || 74 (firstone && *p == '\0' && bitset(QPRIMARY, ctladdr->q_flags))) 75 a->q_flags |= QPRIMARY; 76 77 /* put on send queue or suppress self-reference */ 78 if (ctladdr != NULL && sameaddr(ctladdr, a, FALSE)) 79 selfref = TRUE; 80 else 81 al = a; 82 firstone = FALSE; 83 } 84 85 /* if this alias doesn't include itself, delete ctladdr */ 86 if (!selfref && ctladdr != NULL) 87 ctladdr->q_flags |= QDONTSEND; 88 89 /* arrange to send to everyone on the local send list */ 90 while (al != NULL) 91 { 92 register ADDRESS *a = al; 93 94 al = a->q_next; 95 recipient(a, sendq); 96 97 /* arrange to inherit full name */ 98 if (a->q_fullname == NULL && ctladdr != NULL) 99 a->q_fullname = ctladdr->q_fullname; 100 } 101 102 CurEnv->e_to = NULL; 103 } 104 /* 105 ** RECIPIENT -- Designate a message recipient 106 ** 107 ** Saves the named person for future mailing. 108 ** 109 ** Parameters: 110 ** a -- the (preparsed) address header for the recipient. 111 ** sendq -- a pointer to the head of a queue to put the 112 ** recipient in. Duplicate supression is done 113 ** in this queue. 114 ** 115 ** Returns: 116 ** none. 117 ** 118 ** Side Effects: 119 ** none. 120 */ 121 122 recipient(a, sendq) 123 register ADDRESS *a; 124 register ADDRESS **sendq; 125 { 126 register ADDRESS *q; 127 ADDRESS **pq; 128 register struct mailer *m; 129 extern ADDRESS *getctladdr(); 130 extern bool safefile(); 131 132 CurEnv->e_to = a->q_paddr; 133 m = a->q_mailer; 134 errno = 0; 135 # ifdef DEBUG 136 if (tTd(26, 1)) 137 { 138 printf("\nrecipient: "); 139 printaddr(a, FALSE); 140 } 141 # endif DEBUG 142 143 /* break aliasing loops */ 144 if (AliasLevel > MAXRCRSN) 145 { 146 usrerr("aliasing/forwarding loop broken"); 147 return; 148 } 149 150 /* 151 ** Finish setting up address structure. 152 */ 153 154 a->q_timeout = TimeOut; 155 156 /* do sickly crude mapping for program mailing, etc. */ 157 if (a->q_mailer == LocalMailer) 158 { 159 if (a->q_user[0] == '|') 160 { 161 a->q_mailer = m = ProgMailer; 162 a->q_user++; 163 if (a->q_alias == NULL && !tTd(0, 1) && !QueueRun && !ForceMail) 164 { 165 usrerr("Cannot mail directly to programs"); 166 a->q_flags |= QDONTSEND; 167 } 168 } 169 } 170 171 /* 172 ** Look up this person in the recipient list. 173 ** If they are there already, return, otherwise continue. 174 ** If the list is empty, just add it. Notice the cute 175 ** hack to make from addresses suppress things correctly: 176 ** the QDONTSEND bit will be set in the send list. 177 ** [Please note: the emphasis is on "hack."] 178 */ 179 180 for (pq = sendq; (q = *pq) != NULL; pq = &q->q_next) 181 { 182 if (!ForceMail && sameaddr(q, a, FALSE)) 183 { 184 # ifdef DEBUG 185 if (tTd(26, 1)) 186 { 187 printf("%s in sendq: ", a->q_paddr); 188 printaddr(q, FALSE); 189 } 190 # endif DEBUG 191 if (!bitset(QDONTSEND, a->q_flags)) 192 message(Arpa_Info, "duplicate suppressed"); 193 if (!bitset(QPRIMARY, q->q_flags)) 194 q->q_flags |= a->q_flags; 195 return; 196 } 197 } 198 199 /* add address on list */ 200 *pq = a; 201 a->q_next = NULL; 202 if (DontSend) 203 a->q_flags |= QDONTSEND; 204 205 /* 206 ** Alias the name and handle :include: specs. 207 */ 208 209 if (a->q_mailer == LocalMailer) 210 { 211 if (strncmp(a->q_user, ":include:", 9) == 0) 212 { 213 a->q_flags |= QDONTSEND; 214 if (a->q_alias == NULL && !tTd(0, 1) && !QueueRun && !ForceMail) 215 usrerr("Cannot mail directly to :include:s"); 216 else 217 { 218 message(Arpa_Info, "including file %s", &a->q_user[9]); 219 include(&a->q_user[9], " sending", a, sendq); 220 } 221 } 222 else 223 alias(a, sendq); 224 } 225 226 /* 227 ** If the user is local and still being sent, verify that 228 ** the address is good. If it is, try to forward. 229 ** If the address is already good, we have a forwarding 230 ** loop. This can be broken by just sending directly to 231 ** the user (which is probably correct anyway). 232 */ 233 234 if (!bitset(QDONTSEND, a->q_flags) && a->q_mailer == LocalMailer) 235 { 236 char buf[MAXNAME]; 237 register char *p; 238 struct stat stb; 239 extern bool writable(); 240 bool quoted = FALSE; 241 242 (void) strcpy(buf, a->q_user); 243 for (p = buf; *p != '\0' && !quoted; p++) 244 { 245 if (!isascii(*p) && (*p & 0377) != (SPACESUB & 0377)) 246 quoted = TRUE; 247 } 248 stripquotes(buf, TRUE); 249 250 /* see if this is to a file */ 251 if (buf[0] == '/') 252 { 253 p = rindex(buf, '/'); 254 /* check if writable or creatable */ 255 if (a->q_alias == NULL && !tTd(0, 1) && !QueueRun && !ForceMail) 256 { 257 usrerr("Cannot mail directly to files"); 258 a->q_flags |= QDONTSEND; 259 } 260 else if ((stat(buf, &stb) >= 0) ? (!writable(&stb)) : 261 (*p = '\0', !safefile(buf, getruid(), S_IWRITE|S_IEXEC))) 262 { 263 a->q_flags |= QBADADDR; 264 giveresponse(EX_CANTCREAT, TRUE, m); 265 } 266 } 267 else 268 { 269 register struct passwd *pw; 270 extern struct passwd *finduser(); 271 272 /* warning -- finduser may trash buf */ 273 pw = finduser(buf); 274 if (pw == NULL) 275 { 276 a->q_flags |= QBADADDR; 277 giveresponse(EX_NOUSER, TRUE, m); 278 } 279 else 280 { 281 char nbuf[MAXNAME]; 282 283 if (strcmp(a->q_user, pw->pw_name) != 0) 284 { 285 a->q_user = newstr(pw->pw_name); 286 (void) strcpy(buf, pw->pw_name); 287 } 288 a->q_home = newstr(pw->pw_dir); 289 a->q_uid = pw->pw_uid; 290 a->q_gid = pw->pw_gid; 291 a->q_flags |= QGOODUID; 292 buildfname(pw->pw_gecos, pw->pw_name, nbuf); 293 if (nbuf[0] != '\0') 294 a->q_fullname = newstr(nbuf); 295 if (!quoted) 296 forward(a, sendq); 297 } 298 } 299 } 300 } 301 /* 302 ** FINDUSER -- find the password entry for a user. 303 ** 304 ** This looks a lot like getpwnam, except that it may want to 305 ** do some fancier pattern matching in /etc/passwd. 306 ** 307 ** Parameters: 308 ** name -- the name to match against. 309 ** 310 ** Returns: 311 ** A pointer to a pw struct. 312 ** NULL if name is unknown or ambiguous. 313 ** 314 ** Side Effects: 315 ** may modify name. 316 */ 317 318 struct passwd * 319 finduser(name) 320 char *name; 321 { 322 extern struct passwd *getpwent(); 323 register struct passwd *pw; 324 register char *p; 325 326 /* 327 ** Make name canonical. 328 */ 329 330 for (p = name; *p != '\0'; p++) 331 { 332 if (*p == (SPACESUB & 0177) || *p == '_') 333 *p = ' '; 334 } 335 336 setpwent(); 337 while ((pw = getpwent()) != NULL) 338 { 339 char buf[MAXNAME]; 340 extern bool sameword(); 341 342 if (strcmp(pw->pw_name, name) == 0) 343 return (pw); 344 buildfname(pw->pw_gecos, pw->pw_name, buf); 345 if (index(buf, ' ') != NULL && sameword(buf, name)) 346 { 347 message(Arpa_Info, "sending to login name %s", pw->pw_name); 348 return (pw); 349 } 350 } 351 return (NULL); 352 } 353 /* 354 ** WRITABLE -- predicate returning if the file is writable. 355 ** 356 ** This routine must duplicate the algorithm in sys/fio.c. 357 ** Unfortunately, we cannot use the access call since we 358 ** won't necessarily be the real uid when we try to 359 ** actually open the file. 360 ** 361 ** Notice that ANY file with ANY execute bit is automatically 362 ** not writable. This is also enforced by mailfile. 363 ** 364 ** Parameters: 365 ** s -- pointer to a stat struct for the file. 366 ** 367 ** Returns: 368 ** TRUE -- if we will be able to write this file. 369 ** FALSE -- if we cannot write this file. 370 ** 371 ** Side Effects: 372 ** none. 373 */ 374 375 bool 376 writable(s) 377 register struct stat *s; 378 { 379 int euid, egid; 380 int bits; 381 382 if (bitset(0111, s->st_mode)) 383 return (FALSE); 384 euid = getruid(); 385 egid = getrgid(); 386 if (geteuid() == 0) 387 { 388 if (bitset(S_ISUID, s->st_mode)) 389 euid = s->st_uid; 390 if (bitset(S_ISGID, s->st_mode)) 391 egid = s->st_gid; 392 } 393 394 if (euid == 0) 395 return (TRUE); 396 bits = S_IWRITE; 397 if (euid != s->st_uid) 398 { 399 bits >>= 3; 400 if (egid != s->st_gid) 401 bits >>= 3; 402 } 403 return ((s->st_mode & bits) != 0); 404 } 405 /* 406 ** INCLUDE -- handle :include: specification. 407 ** 408 ** Parameters: 409 ** fname -- filename to include. 410 ** msg -- message to print in verbose mode. 411 ** ctladdr -- address template to use to fill in these 412 ** addresses -- effective user/group id are 413 ** the important things. 414 ** sendq -- a pointer to the head of the send queue 415 ** to put these addresses in. 416 ** 417 ** Returns: 418 ** none. 419 ** 420 ** Side Effects: 421 ** reads the :include: file and sends to everyone 422 ** listed in that file. 423 */ 424 425 include(fname, msg, ctladdr, sendq) 426 char *fname; 427 char *msg; 428 ADDRESS *ctladdr; 429 ADDRESS **sendq; 430 { 431 char buf[MAXLINE]; 432 register FILE *fp; 433 char *oldto = CurEnv->e_to; 434 435 fp = fopen(fname, "r"); 436 if (fp == NULL) 437 { 438 usrerr("Cannot open %s", fname); 439 return; 440 } 441 if (getctladdr(ctladdr) == NULL) 442 { 443 struct stat st; 444 445 if (fstat(fileno(fp), &st) < 0) 446 syserr("Cannot fstat %s!", fname); 447 ctladdr->q_uid = st.st_uid; 448 ctladdr->q_gid = st.st_gid; 449 ctladdr->q_flags |= QGOODUID; 450 } 451 452 /* read the file -- each line is a comma-separated list. */ 453 while (fgets(buf, sizeof buf, fp) != NULL) 454 { 455 register char *p = index(buf, '\n'); 456 457 if (p != NULL) 458 *p = '\0'; 459 if (buf[0] == '\0') 460 continue; 461 CurEnv->e_to = oldto; 462 message(Arpa_Info, "%s to %s", msg, buf); 463 AliasLevel++; 464 sendto(buf, ctladdr, sendq); 465 AliasLevel--; 466 } 467 468 (void) fclose(fp); 469 } 470 /* 471 ** SENDTOARGV -- send to an argument vector. 472 ** 473 ** Parameters: 474 ** argv -- argument vector to send to. 475 ** 476 ** Returns: 477 ** none. 478 ** 479 ** Side Effects: 480 ** puts all addresses on the argument vector onto the 481 ** send queue. 482 */ 483 484 sendtoargv(argv) 485 register char **argv; 486 { 487 register char *p; 488 extern bool sameword(); 489 490 while ((p = *argv++) != NULL) 491 { 492 if (argv[0] != NULL && argv[1] != NULL && sameword(argv[0], "at")) 493 { 494 char nbuf[MAXNAME]; 495 496 if (strlen(p) + strlen(argv[1]) + 2 > sizeof nbuf) 497 usrerr("address overflow"); 498 else 499 { 500 (void) strcpy(nbuf, p); 501 (void) strcat(nbuf, "@"); 502 (void) strcat(nbuf, argv[1]); 503 p = newstr(nbuf); 504 argv += 2; 505 } 506 } 507 sendto(p, (ADDRESS *) NULL, &CurEnv->e_sendqueue); 508 } 509 } 510 /* 511 ** GETCTLADDR -- get controlling address from an address header. 512 ** 513 ** If none, get one corresponding to the effective userid. 514 ** 515 ** Parameters: 516 ** a -- the address to find the controller of. 517 ** 518 ** Returns: 519 ** the controlling address. 520 ** 521 ** Side Effects: 522 ** none. 523 */ 524 525 ADDRESS * 526 getctladdr(a) 527 register ADDRESS *a; 528 { 529 while (a != NULL && !bitset(QGOODUID, a->q_flags)) 530 a = a->q_alias; 531 return (a); 532 } 533