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[] = "@(#)envelope.c 5.5 (Berkeley) 09/19/85"; 13 #endif not lint 14 15 #include <pwd.h> 16 #include <sys/time.h> 17 #include "sendmail.h" 18 #include <sys/stat.h> 19 20 /* 21 ** NEWENVELOPE -- allocate a new envelope 22 ** 23 ** Supports inheritance. 24 ** 25 ** Parameters: 26 ** e -- the new envelope to fill in. 27 ** 28 ** Returns: 29 ** e. 30 ** 31 ** Side Effects: 32 ** none. 33 */ 34 35 ENVELOPE * 36 newenvelope(e) 37 register ENVELOPE *e; 38 { 39 register HDR *bh; 40 register HDR **nhp; 41 register ENVELOPE *parent; 42 extern putheader(), putbody(); 43 extern ENVELOPE BlankEnvelope; 44 45 parent = CurEnv; 46 if (e == CurEnv) 47 parent = e->e_parent; 48 bzero((char *) e, sizeof *e); 49 if (e == CurEnv) 50 bcopy((char *) &NullAddress, (char *) &e->e_from, sizeof e->e_from); 51 else 52 bcopy((char *) &CurEnv->e_from, (char *) &e->e_from, sizeof e->e_from); 53 e->e_parent = parent; 54 e->e_ctime = curtime(); 55 e->e_puthdr = putheader; 56 e->e_putbody = putbody; 57 bh = BlankEnvelope.e_header; 58 nhp = &e->e_header; 59 while (bh != NULL) 60 { 61 *nhp = (HDR *) xalloc(sizeof *bh); 62 bcopy((char *) bh, (char *) *nhp, sizeof *bh); 63 bh = bh->h_link; 64 nhp = &(*nhp)->h_link; 65 } 66 if (CurEnv->e_xfp != NULL) 67 (void) fflush(CurEnv->e_xfp); 68 69 return (e); 70 } 71 /* 72 ** DROPENVELOPE -- deallocate an envelope. 73 ** 74 ** Parameters: 75 ** e -- the envelope to deallocate. 76 ** 77 ** Returns: 78 ** none. 79 ** 80 ** Side Effects: 81 ** housekeeping necessary to dispose of an envelope. 82 ** Unlocks this queue file. 83 */ 84 85 dropenvelope(e) 86 register ENVELOPE *e; 87 { 88 bool queueit = FALSE; 89 register ADDRESS *q; 90 91 #ifdef DEBUG 92 if (tTd(50, 1)) 93 { 94 printf("dropenvelope %x id=", e); 95 xputs(e->e_id); 96 printf(" flags=%o\n", e->e_flags); 97 } 98 #endif DEBUG 99 #ifdef LOG 100 if (LogLevel > 10) 101 syslog(LOG_DEBUG, "dropenvelope, id=%s, flags=%o, pid=%d", 102 e->e_id == NULL ? "(none)" : e->e_id, 103 e->e_flags, getpid()); 104 #endif LOG 105 106 /* we must have an id to remove disk files */ 107 if (e->e_id == NULL) 108 return; 109 110 /* 111 ** Extract state information from dregs of send list. 112 */ 113 114 for (q = e->e_sendqueue; q != NULL; q = q->q_next) 115 { 116 if (bitset(QQUEUEUP, q->q_flags)) 117 queueit = TRUE; 118 } 119 120 /* 121 ** Send back return receipts as requested. 122 */ 123 124 if (e->e_receiptto != NULL && bitset(EF_SENDRECEIPT, e->e_flags)) 125 { 126 auto ADDRESS *rlist = NULL; 127 128 sendtolist(CurEnv->e_receiptto, (ADDRESS *) NULL, &rlist); 129 (void) returntosender("Return receipt", rlist, FALSE); 130 } 131 132 /* 133 ** Arrange to send error messages if there are fatal errors. 134 */ 135 136 if (bitset(EF_FATALERRS|EF_TIMEOUT, e->e_flags) && ErrorMode != EM_QUIET) 137 savemail(e); 138 139 /* 140 ** Instantiate or deinstantiate the queue. 141 */ 142 143 if ((!queueit && !bitset(EF_KEEPQUEUE, e->e_flags)) || 144 bitset(EF_CLRQUEUE, e->e_flags)) 145 { 146 if (e->e_df != NULL) 147 xunlink(e->e_df); 148 xunlink(queuename(e, 'q')); 149 } 150 else if (queueit || !bitset(EF_INQUEUE, e->e_flags)) 151 { 152 #ifdef QUEUE 153 queueup(e, FALSE, FALSE); 154 #else QUEUE 155 syserr("dropenvelope: queueup"); 156 #endif QUEUE 157 } 158 159 /* now unlock the job */ 160 closexscript(e); 161 unlockqueue(e); 162 163 /* make sure that this envelope is marked unused */ 164 e->e_id = e->e_df = NULL; 165 if (e->e_dfp != NULL) 166 (void) fclose(e->e_dfp); 167 e->e_dfp = NULL; 168 } 169 /* 170 ** CLEARENVELOPE -- clear an envelope without unlocking 171 ** 172 ** This is normally used by a child process to get a clean 173 ** envelope without disturbing the parent. 174 ** 175 ** Parameters: 176 ** e -- the envelope to clear. 177 ** 178 ** Returns: 179 ** none. 180 ** 181 ** Side Effects: 182 ** Closes files associated with the envelope. 183 ** Marks the envelope as unallocated. 184 */ 185 186 clearenvelope(e) 187 register ENVELOPE *e; 188 { 189 /* clear out any file information */ 190 if (e->e_xfp != NULL) 191 (void) fclose(e->e_xfp); 192 if (e->e_dfp != NULL) 193 (void) fclose(e->e_dfp); 194 195 /* now clear out the data */ 196 bzero((char *) e, sizeof *e); 197 } 198 /* 199 ** INITSYS -- initialize instantiation of system 200 ** 201 ** In Daemon mode, this is done in the child. 202 ** 203 ** Parameters: 204 ** none. 205 ** 206 ** Returns: 207 ** none. 208 ** 209 ** Side Effects: 210 ** Initializes the system macros, some global variables, 211 ** etc. In particular, the current time in various 212 ** forms is set. 213 */ 214 215 initsys() 216 { 217 static char cbuf[5]; /* holds hop count */ 218 static char pbuf[10]; /* holds pid */ 219 #ifdef TTYNAME 220 static char ybuf[10]; /* holds tty id */ 221 register char *p; 222 #endif TTYNAME 223 extern char *ttyname(); 224 extern char *macvalue(); 225 extern char Version[]; 226 227 /* 228 ** Give this envelope a reality. 229 ** I.e., an id, a transcript, and a creation time. 230 */ 231 232 openxscript(CurEnv); 233 CurEnv->e_ctime = curtime(); 234 235 /* 236 ** Set OutChannel to something useful if stdout isn't it. 237 ** This arranges that any extra stuff the mailer produces 238 ** gets sent back to the user on error (because it is 239 ** tucked away in the transcript). 240 */ 241 242 if (OpMode == MD_DAEMON && QueueRun) 243 OutChannel = CurEnv->e_xfp; 244 245 /* 246 ** Set up some basic system macros. 247 */ 248 249 /* process id */ 250 (void) sprintf(pbuf, "%d", getpid()); 251 define('p', pbuf, CurEnv); 252 253 /* hop count */ 254 (void) sprintf(cbuf, "%d", CurEnv->e_hopcount); 255 define('c', cbuf, CurEnv); 256 257 /* time as integer, unix time, arpa time */ 258 settime(); 259 260 #ifdef TTYNAME 261 /* tty name */ 262 if (macvalue('y', CurEnv) == NULL) 263 { 264 p = ttyname(2); 265 if (p != NULL) 266 { 267 if (rindex(p, '/') != NULL) 268 p = rindex(p, '/') + 1; 269 (void) strcpy(ybuf, p); 270 define('y', ybuf, CurEnv); 271 } 272 } 273 #endif TTYNAME 274 } 275 /* 276 ** SETTIME -- set the current time. 277 ** 278 ** Parameters: 279 ** none. 280 ** 281 ** Returns: 282 ** none. 283 ** 284 ** Side Effects: 285 ** Sets the various time macros -- $a, $b, $d, $t. 286 */ 287 288 settime() 289 { 290 register char *p; 291 auto time_t now; 292 static char tbuf[20]; /* holds "current" time */ 293 static char dbuf[30]; /* holds ctime(tbuf) */ 294 register struct tm *tm; 295 extern char *arpadate(); 296 extern struct tm *gmtime(); 297 extern char *macvalue(); 298 299 now = curtime(); 300 tm = gmtime(&now); 301 (void) sprintf(tbuf, "%02d%02d%02d%02d%02d", tm->tm_year, tm->tm_mon+1, 302 tm->tm_mday, tm->tm_hour, tm->tm_min); 303 define('t', tbuf, CurEnv); 304 (void) strcpy(dbuf, ctime(&now)); 305 *index(dbuf, '\n') = '\0'; 306 if (macvalue('d', CurEnv) == NULL) 307 define('d', dbuf, CurEnv); 308 p = newstr(arpadate(dbuf)); 309 if (macvalue('a', CurEnv) == NULL) 310 define('a', p, CurEnv); 311 define('b', p, CurEnv); 312 } 313 /* 314 ** OPENXSCRIPT -- Open transcript file 315 ** 316 ** Creates a transcript file for possible eventual mailing or 317 ** sending back. 318 ** 319 ** Parameters: 320 ** e -- the envelope to create the transcript in/for. 321 ** 322 ** Returns: 323 ** none 324 ** 325 ** Side Effects: 326 ** Creates the transcript file. 327 */ 328 329 openxscript(e) 330 register ENVELOPE *e; 331 { 332 register char *p; 333 334 # ifdef LOG 335 if (LogLevel > 19) 336 syslog(LOG_DEBUG, "%s: openx%s", e->e_id, e->e_xfp == NULL ? "" : " (no)"); 337 # endif LOG 338 if (e->e_xfp != NULL) 339 return; 340 p = queuename(e, 'x'); 341 e->e_xfp = fopen(p, "w"); 342 if (e->e_xfp == NULL) 343 syserr("Can't create %s", p); 344 else 345 (void) chmod(p, 0644); 346 } 347 /* 348 ** CLOSEXSCRIPT -- close the transcript file. 349 ** 350 ** Parameters: 351 ** e -- the envelope containing the transcript to close. 352 ** 353 ** Returns: 354 ** none. 355 ** 356 ** Side Effects: 357 ** none. 358 */ 359 360 closexscript(e) 361 register ENVELOPE *e; 362 { 363 if (e->e_xfp == NULL) 364 return; 365 (void) fclose(e->e_xfp); 366 e->e_xfp = NULL; 367 } 368 /* 369 ** SETSENDER -- set the person who this message is from 370 ** 371 ** Under certain circumstances allow the user to say who 372 ** s/he is (using -f or -r). These are: 373 ** 1. The user's uid is zero (root). 374 ** 2. The user's login name is in an approved list (typically 375 ** from a network server). 376 ** 3. The address the user is trying to claim has a 377 ** "!" character in it (since #2 doesn't do it for 378 ** us if we are dialing out for UUCP). 379 ** A better check to replace #3 would be if the 380 ** effective uid is "UUCP" -- this would require me 381 ** to rewrite getpwent to "grab" uucp as it went by, 382 ** make getname more nasty, do another passwd file 383 ** scan, or compile the UID of "UUCP" into the code, 384 ** all of which are reprehensible. 385 ** 386 ** Assuming all of these fail, we figure out something 387 ** ourselves. 388 ** 389 ** Parameters: 390 ** from -- the person we would like to believe this message 391 ** is from, as specified on the command line. 392 ** 393 ** Returns: 394 ** none. 395 ** 396 ** Side Effects: 397 ** sets sendmail's notion of who the from person is. 398 */ 399 400 setsender(from) 401 char *from; 402 { 403 register char **pvp; 404 char *realname = NULL; 405 register struct passwd *pw; 406 char buf[MAXNAME]; 407 char pvpbuf[PSBUFSIZE]; 408 extern struct passwd *getpwnam(); 409 extern char *macvalue(); 410 extern char **prescan(); 411 extern bool safefile(); 412 extern char *FullName; 413 414 # ifdef DEBUG 415 if (tTd(45, 1)) 416 printf("setsender(%s)\n", from == NULL ? "" : from); 417 # endif DEBUG 418 419 /* 420 ** Figure out the real user executing us. 421 ** Username can return errno != 0 on non-errors. 422 */ 423 424 if (QueueRun || OpMode == MD_SMTP || OpMode == MD_ARPAFTP) 425 realname = from; 426 if (realname == NULL || realname[0] == '\0') 427 { 428 extern char *username(); 429 430 realname = username(); 431 } 432 433 /* 434 ** Determine if this real person is allowed to alias themselves. 435 */ 436 437 if (from != NULL) 438 { 439 extern bool trusteduser(); 440 441 if (!trusteduser(realname) && 442 # ifdef DEBUG 443 (!tTd(1, 9) || getuid() != geteuid()) && 444 # endif DEBUG 445 index(from, '!') == NULL && getuid() != 0) 446 { 447 /* network sends -r regardless (why why why?) */ 448 /* syserr("%s, you cannot use the -f flag", realname); */ 449 from = NULL; 450 } 451 } 452 453 SuprErrs = TRUE; 454 if (from == NULL || parseaddr(from, &CurEnv->e_from, 1, '\0') == NULL) 455 { 456 /* log garbage addresses for traceback */ 457 if (from != NULL) 458 { 459 # ifdef LOG 460 if (LogLevel >= 1) 461 syslog(LOG_ERR, "Unparseable user %s wants to be %s", 462 realname, from); 463 # endif LOG 464 } 465 from = newstr(realname); 466 if (parseaddr(from, &CurEnv->e_from, 1, '\0') == NULL && 467 parseaddr("postmaster", &CurEnv->e_from, 1, '\0') == NULL) 468 { 469 syserr("setsender: can't even parse postmaster!"); 470 } 471 } 472 else 473 FromFlag = TRUE; 474 CurEnv->e_from.q_flags |= QDONTSEND; 475 loweraddr(&CurEnv->e_from); 476 SuprErrs = FALSE; 477 478 if (CurEnv->e_from.q_mailer == LocalMailer && 479 (pw = getpwnam(CurEnv->e_from.q_user)) != NULL) 480 { 481 /* 482 ** Process passwd file entry. 483 */ 484 485 486 /* extract home directory */ 487 CurEnv->e_from.q_home = newstr(pw->pw_dir); 488 define('z', CurEnv->e_from.q_home, CurEnv); 489 490 /* extract user and group id */ 491 CurEnv->e_from.q_uid = pw->pw_uid; 492 CurEnv->e_from.q_gid = pw->pw_gid; 493 494 /* if the user has given fullname already, don't redefine */ 495 if (FullName == NULL) 496 FullName = macvalue('x', CurEnv); 497 if (FullName != NULL && FullName[0] == '\0') 498 FullName = NULL; 499 500 /* extract full name from passwd file */ 501 if (FullName == NULL && pw->pw_gecos != NULL && 502 strcmp(pw->pw_name, CurEnv->e_from.q_user) == 0) 503 { 504 buildfname(pw->pw_gecos, CurEnv->e_from.q_user, buf); 505 if (buf[0] != '\0') 506 FullName = newstr(buf); 507 } 508 if (FullName != NULL) 509 define('x', FullName, CurEnv); 510 } 511 else 512 { 513 #ifndef V6 514 if (CurEnv->e_from.q_home == NULL) 515 CurEnv->e_from.q_home = getenv("HOME"); 516 #endif V6 517 CurEnv->e_from.q_uid = getuid(); 518 CurEnv->e_from.q_gid = getgid(); 519 } 520 521 if (CurEnv->e_from.q_uid != 0) 522 { 523 DefUid = CurEnv->e_from.q_uid; 524 DefGid = CurEnv->e_from.q_gid; 525 } 526 527 /* 528 ** Rewrite the from person to dispose of possible implicit 529 ** links in the net. 530 */ 531 532 pvp = prescan(from, '\0', pvpbuf); 533 if (pvp == NULL) 534 { 535 syserr("cannot prescan from (%s)", from); 536 finis(); 537 } 538 rewrite(pvp, 3); 539 rewrite(pvp, 1); 540 rewrite(pvp, 4); 541 cataddr(pvp, buf, sizeof buf); 542 define('f', newstr(buf), CurEnv); 543 544 /* save the domain spec if this mailer wants it */ 545 if (CurEnv->e_from.q_mailer != NULL && 546 bitnset(M_CANONICAL, CurEnv->e_from.q_mailer->m_flags)) 547 { 548 extern char **copyplist(); 549 550 while (*pvp != NULL && strcmp(*pvp, "@") != 0) 551 pvp++; 552 if (*pvp != NULL) 553 CurEnv->e_fromdomain = copyplist(pvp, TRUE); 554 } 555 } 556 /* 557 ** TRUSTEDUSER -- tell us if this user is to be trusted. 558 ** 559 ** Parameters: 560 ** user -- the user to be checked. 561 ** 562 ** Returns: 563 ** TRUE if the user is in an approved list. 564 ** FALSE otherwise. 565 ** 566 ** Side Effects: 567 ** none. 568 */ 569 570 bool 571 trusteduser(user) 572 char *user; 573 { 574 register char **ulist; 575 extern char *TrustedUsers[]; 576 577 for (ulist = TrustedUsers; *ulist != NULL; ulist++) 578 if (strcmp(*ulist, user) == 0) 579 return (TRUE); 580 return (FALSE); 581 } 582