1 /* 2 * Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers. 3 * All rights reserved. 4 * Copyright (c) 1983, 1995-1997 Eric P. Allman. All rights reserved. 5 * Copyright (c) 1988, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * By using this file, you agree to the terms and conditions set 9 * forth in the LICENSE file which can be found at the top level of 10 * the sendmail distribution. 11 * 12 */ 13 14 15 #include <sendmail.h> 16 17 #ifndef lint 18 # if SMTP 19 static char id[] = "@(#)$Id: srvrsmtp.c,v 8.471.2.2.2.67 2001/01/07 19:31:05 gshapiro Exp $ (with SMTP)"; 20 # else /* SMTP */ 21 static char id[] = "@(#)$Id: srvrsmtp.c,v 8.471.2.2.2.67 2001/01/07 19:31:05 gshapiro Exp $ (without SMTP)"; 22 # endif /* SMTP */ 23 #endif /* ! lint */ 24 25 #if SMTP 26 # if SASL || STARTTLS 27 # include "sfsasl.h" 28 # endif /* SASL || STARTTLS */ 29 # if SASL 30 # define ENC64LEN(l) (((l) + 2) * 4 / 3 + 1) 31 static int saslmechs __P((sasl_conn_t *, char **)); 32 # endif /* SASL */ 33 # if STARTTLS 34 # include <sysexits.h> 35 # include <openssl/err.h> 36 # include <openssl/bio.h> 37 # include <openssl/pem.h> 38 # ifndef HASURANDOMDEV 39 # include <openssl/rand.h> 40 # endif /* !HASURANDOMDEV */ 41 42 static SSL *srv_ssl = NULL; 43 static SSL_CTX *srv_ctx = NULL; 44 # if !TLS_NO_RSA 45 static RSA *rsa = NULL; 46 # endif /* !TLS_NO_RSA */ 47 static bool tls_ok = FALSE; 48 static int tls_verify_cb __P((X509_STORE_CTX *)); 49 # if !TLS_NO_RSA 50 # define RSA_KEYLENGTH 512 51 # endif /* !TLS_NO_RSA */ 52 # endif /* STARTTLS */ 53 54 static time_t checksmtpattack __P((volatile int *, int, bool, 55 char *, ENVELOPE *)); 56 static void mail_esmtp_args __P((char *, char *, ENVELOPE *)); 57 static void printvrfyaddr __P((ADDRESS *, bool, bool)); 58 static void rcpt_esmtp_args __P((ADDRESS *, char *, char *, ENVELOPE *)); 59 static int runinchild __P((char *, ENVELOPE *)); 60 static char *skipword __P((char *volatile, char *)); 61 extern ENVELOPE BlankEnvelope; 62 63 /* 64 ** SMTP -- run the SMTP protocol. 65 ** 66 ** Parameters: 67 ** nullserver -- if non-NULL, rejection message for 68 ** all SMTP commands. 69 ** e -- the envelope. 70 ** 71 ** Returns: 72 ** never. 73 ** 74 ** Side Effects: 75 ** Reads commands from the input channel and processes 76 ** them. 77 */ 78 79 struct cmd 80 { 81 char *cmd_name; /* command name */ 82 int cmd_code; /* internal code, see below */ 83 }; 84 85 /* values for cmd_code */ 86 # define CMDERROR 0 /* bad command */ 87 # define CMDMAIL 1 /* mail -- designate sender */ 88 # define CMDRCPT 2 /* rcpt -- designate recipient */ 89 # define CMDDATA 3 /* data -- send message text */ 90 # define CMDRSET 4 /* rset -- reset state */ 91 # define CMDVRFY 5 /* vrfy -- verify address */ 92 # define CMDEXPN 6 /* expn -- expand address */ 93 # define CMDNOOP 7 /* noop -- do nothing */ 94 # define CMDQUIT 8 /* quit -- close connection and die */ 95 # define CMDHELO 9 /* helo -- be polite */ 96 # define CMDHELP 10 /* help -- give usage info */ 97 # define CMDEHLO 11 /* ehlo -- extended helo (RFC 1425) */ 98 # define CMDETRN 12 /* etrn -- flush queue */ 99 # if SASL 100 # define CMDAUTH 13 /* auth -- SASL authenticate */ 101 # endif /* SASL */ 102 # if STARTTLS 103 # define CMDSTLS 14 /* STARTTLS -- start TLS session */ 104 # endif /* STARTTLS */ 105 /* non-standard commands */ 106 # define CMDONEX 16 /* onex -- sending one transaction only */ 107 # define CMDVERB 17 /* verb -- go into verbose mode */ 108 # define CMDXUSR 18 /* xusr -- initial (user) submission */ 109 /* unimplemented commands from RFC 821 */ 110 # define CMDUNIMPL 19 /* unimplemented rfc821 commands */ 111 /* use this to catch and log "door handle" attempts on your system */ 112 # define CMDLOGBOGUS 23 /* bogus command that should be logged */ 113 /* debugging-only commands, only enabled if SMTPDEBUG is defined */ 114 # define CMDDBGQSHOW 24 /* showq -- show send queue */ 115 # define CMDDBGDEBUG 25 /* debug -- set debug mode */ 116 117 /* 118 ** Note: If you change this list, 119 ** remember to update 'helpfile' 120 */ 121 122 static struct cmd CmdTab[] = 123 { 124 { "mail", CMDMAIL }, 125 { "rcpt", CMDRCPT }, 126 { "data", CMDDATA }, 127 { "rset", CMDRSET }, 128 { "vrfy", CMDVRFY }, 129 { "expn", CMDEXPN }, 130 { "help", CMDHELP }, 131 { "noop", CMDNOOP }, 132 { "quit", CMDQUIT }, 133 { "helo", CMDHELO }, 134 { "ehlo", CMDEHLO }, 135 { "etrn", CMDETRN }, 136 { "verb", CMDVERB }, 137 { "onex", CMDONEX }, 138 { "xusr", CMDXUSR }, 139 { "send", CMDUNIMPL }, 140 { "saml", CMDUNIMPL }, 141 { "soml", CMDUNIMPL }, 142 { "turn", CMDUNIMPL }, 143 # if SASL 144 { "auth", CMDAUTH, }, 145 # endif /* SASL */ 146 # if STARTTLS 147 { "starttls", CMDSTLS, }, 148 # endif /* STARTTLS */ 149 /* remaining commands are here only to trap and log attempts to use them */ 150 { "showq", CMDDBGQSHOW }, 151 { "debug", CMDDBGDEBUG }, 152 { "wiz", CMDLOGBOGUS }, 153 154 { NULL, CMDERROR } 155 }; 156 157 static bool OneXact = FALSE; /* one xaction only this run */ 158 static char *CurSmtpClient; /* who's at the other end of channel */ 159 160 # define MAXBADCOMMANDS 25 /* maximum number of bad commands */ 161 # define MAXNOOPCOMMANDS 20 /* max "noise" commands before slowdown */ 162 # define MAXHELOCOMMANDS 3 /* max HELO/EHLO commands before slowdown */ 163 # define MAXVRFYCOMMANDS 6 /* max VRFY/EXPN commands before slowdown */ 164 # define MAXETRNCOMMANDS 8 /* max ETRN commands before slowdown */ 165 # define MAXTIMEOUT (4 * 60) /* max timeout for bad commands */ 166 167 /* runinchild() returns */ 168 # define RIC_INCHILD 0 /* in a child process */ 169 # define RIC_INPARENT 1 /* still in parent process */ 170 # define RIC_TEMPFAIL 2 /* temporary failure occurred */ 171 172 void 173 smtp(nullserver, d_flags, e) 174 char *volatile nullserver; 175 BITMAP256 d_flags; 176 register ENVELOPE *volatile e; 177 { 178 register char *volatile p; 179 register struct cmd *volatile c = NULL; 180 char *cmd; 181 auto ADDRESS *vrfyqueue; 182 ADDRESS *a; 183 volatile bool gotmail; /* mail command received */ 184 volatile bool gothello; /* helo command received */ 185 bool vrfy; /* set if this is a vrfy command */ 186 char *volatile protocol; /* sending protocol */ 187 char *volatile sendinghost; /* sending hostname */ 188 char *volatile peerhostname; /* name of SMTP peer or "localhost" */ 189 auto char *delimptr; 190 char *id; 191 volatile int nrcpts = 0; /* number of RCPT commands */ 192 int ric; 193 bool doublequeue; 194 volatile bool discard; 195 volatile int badcommands = 0; /* count of bad commands */ 196 volatile int nverifies = 0; /* count of VRFY/EXPN commands */ 197 volatile int n_etrn = 0; /* count of ETRN commands */ 198 volatile int n_noop = 0; /* count of NOOP/VERB/ONEX etc cmds */ 199 volatile int n_helo = 0; /* count of HELO/EHLO commands */ 200 volatile int delay = 1; /* timeout for bad commands */ 201 bool ok; 202 volatile bool tempfail = FALSE; 203 # if _FFR_MILTER 204 volatile bool milterize = (nullserver == NULL); 205 # endif /* _FFR_MILTER */ 206 volatile time_t wt; /* timeout after too many commands */ 207 volatile time_t previous; /* time after checksmtpattack() */ 208 volatile bool lognullconnection = TRUE; 209 register char *q; 210 char *addr; 211 char *greetcode = "220"; 212 QUEUE_CHAR *new; 213 int argno; 214 char *args[MAXSMTPARGS]; 215 char inp[MAXLINE]; 216 char cmdbuf[MAXLINE]; 217 # if SASL 218 sasl_conn_t *conn; 219 volatile bool sasl_ok; 220 volatile int n_auth = 0; /* count of AUTH commands */ 221 bool ismore; 222 int result; 223 volatile int authenticating; 224 char *hostname; 225 char *user; 226 char *in, *out, *out2; 227 const char *errstr; 228 int inlen, out2len; 229 unsigned int outlen; 230 char *volatile auth_type; 231 char *mechlist; 232 volatile int n_mechs; 233 int len; 234 sasl_security_properties_t ssp; 235 sasl_external_properties_t ext_ssf; 236 # if SFIO 237 sasl_ssf_t *ssf; 238 # endif /* SFIO */ 239 # endif /* SASL */ 240 # if STARTTLS 241 int r; 242 int rfd, wfd; 243 volatile bool usetls = TRUE; 244 volatile bool tls_active = FALSE; 245 bool saveQuickAbort; 246 bool saveSuprErrs; 247 # endif /* STARTTLS */ 248 249 if (fileno(OutChannel) != fileno(stdout)) 250 { 251 /* arrange for debugging output to go to remote host */ 252 (void) dup2(fileno(OutChannel), fileno(stdout)); 253 } 254 255 settime(e); 256 (void)sm_getla(e); 257 peerhostname = RealHostName; 258 if (peerhostname == NULL) 259 peerhostname = "localhost"; 260 CurHostName = peerhostname; 261 CurSmtpClient = macvalue('_', e); 262 if (CurSmtpClient == NULL) 263 CurSmtpClient = CurHostName; 264 265 /* check_relay may have set discard bit, save for later */ 266 discard = bitset(EF_DISCARD, e->e_flags); 267 268 sm_setproctitle(TRUE, e, "server %s startup", CurSmtpClient); 269 270 # if SASL 271 sasl_ok = FALSE; /* SASL can't be used (yet) */ 272 n_mechs = 0; 273 274 /* SASL server new connection */ 275 hostname = macvalue('j', e); 276 # if SASL > 10505 277 /* use empty realm: only works in SASL > 1.5.5 */ 278 result = sasl_server_new("smtp", hostname, "", NULL, 0, &conn); 279 # else /* SASL > 10505 */ 280 /* use no realm -> realm is set to hostname by SASL lib */ 281 result = sasl_server_new("smtp", hostname, NULL, NULL, 0, &conn); 282 # endif /* SASL > 10505 */ 283 if (result == SASL_OK) 284 { 285 sasl_ok = TRUE; 286 287 /* 288 ** SASL set properties for sasl 289 ** set local/remote IP 290 ** XXX only IPv4: Cyrus SASL doesn't support anything else 291 ** 292 ** XXX where exactly are these used/required? 293 ** Kerberos_v4 294 */ 295 296 # if NETINET 297 in = macvalue(macid("{daemon_family}", NULL), e); 298 if (in != NULL && strcmp(in, "inet") == 0) 299 { 300 SOCKADDR_LEN_T addrsize; 301 struct sockaddr_in saddr_l; 302 struct sockaddr_in saddr_r; 303 304 addrsize = sizeof(struct sockaddr_in); 305 if (getpeername(fileno(InChannel), 306 (struct sockaddr *)&saddr_r, 307 &addrsize) == 0) 308 { 309 sasl_setprop(conn, SASL_IP_REMOTE, &saddr_r); 310 addrsize = sizeof(struct sockaddr_in); 311 if (getsockname(fileno(InChannel), 312 (struct sockaddr *)&saddr_l, 313 &addrsize) == 0) 314 sasl_setprop(conn, SASL_IP_LOCAL, 315 &saddr_l); 316 } 317 } 318 # endif /* NETINET */ 319 320 authenticating = SASL_NOT_AUTH; 321 auth_type = NULL; 322 mechlist = NULL; 323 user = NULL; 324 # if 0 325 define(macid("{auth_author}", NULL), NULL, &BlankEnvelope); 326 # endif /* 0 */ 327 328 /* set properties */ 329 (void) memset(&ssp, '\0', sizeof ssp); 330 # if SFIO 331 /* XXX should these be options settable via .cf ? */ 332 /* ssp.min_ssf = 0; is default due to memset() */ 333 { 334 ssp.max_ssf = INT_MAX; 335 ssp.maxbufsize = MAXOUTLEN; 336 } 337 # endif /* SFIO */ 338 # if _FFR_SASL_OPTS 339 ssp.security_flags = SASLOpts & SASL_SEC_MASK; 340 # endif /* _FFR_SASL_OPTS */ 341 sasl_ok = sasl_setprop(conn, SASL_SEC_PROPS, &ssp) == SASL_OK; 342 343 if (sasl_ok) 344 { 345 /* 346 ** external security strength factor; 347 ** we have none so zero 348 # if STARTTLS 349 ** we may have to change this for STARTTLS 350 ** (dynamically) 351 # endif 352 */ 353 ext_ssf.ssf = 0; 354 ext_ssf.auth_id = NULL; 355 sasl_ok = sasl_setprop(conn, SASL_SSF_EXTERNAL, 356 &ext_ssf) == SASL_OK; 357 } 358 if (sasl_ok) 359 { 360 n_mechs = saslmechs(conn, &mechlist); 361 sasl_ok = n_mechs > 0; 362 } 363 } 364 else 365 { 366 if (LogLevel > 9) 367 sm_syslog(LOG_WARNING, NOQID, 368 "SASL error: sasl_server_new failed=%d", 369 result); 370 } 371 # endif /* SASL */ 372 373 # if STARTTLS 374 # if _FFR_TLS_O_T 375 saveQuickAbort = QuickAbort; 376 saveSuprErrs = SuprErrs; 377 SuprErrs = TRUE; 378 QuickAbort = FALSE; 379 if (rscheck("offer_tls", CurSmtpClient, "", e, TRUE, FALSE, 8, 380 NULL) != EX_OK || Errors > 0) 381 usetls = FALSE; 382 QuickAbort = saveQuickAbort; 383 SuprErrs = saveSuprErrs; 384 # endif /* _FFR_TLS_O_T */ 385 # endif /* STARTTLS */ 386 387 # if _FFR_MILTER 388 if (milterize) 389 { 390 char state; 391 392 /* initialize mail filter connection */ 393 milter_init(e, &state); 394 switch (state) 395 { 396 case SMFIR_REJECT: 397 greetcode = "554"; 398 nullserver = "Command rejected"; 399 milterize = FALSE; 400 break; 401 402 case SMFIR_TEMPFAIL: 403 tempfail = TRUE; 404 milterize = FALSE; 405 break; 406 } 407 } 408 409 if (milterize && !bitset(EF_DISCARD, e->e_flags)) 410 { 411 char state; 412 413 (void) milter_connect(peerhostname, RealHostAddr, 414 e, &state); 415 switch (state) 416 { 417 case SMFIR_REPLYCODE: /* REPLYCODE shouldn't happen */ 418 case SMFIR_REJECT: 419 greetcode = "554"; 420 nullserver = "Command rejected"; 421 milterize = FALSE; 422 break; 423 424 case SMFIR_TEMPFAIL: 425 tempfail = TRUE; 426 milterize = FALSE; 427 break; 428 } 429 } 430 # endif /* _FFR_MILTER */ 431 432 /* output the first line, inserting "ESMTP" as second word */ 433 expand(SmtpGreeting, inp, sizeof inp, e); 434 p = strchr(inp, '\n'); 435 if (p != NULL) 436 *p++ = '\0'; 437 id = strchr(inp, ' '); 438 if (id == NULL) 439 id = &inp[strlen(inp)]; 440 if (p == NULL) 441 snprintf(cmdbuf, sizeof cmdbuf, 442 "%s %%.*s ESMTP%%s", greetcode); 443 else 444 snprintf(cmdbuf, sizeof cmdbuf, 445 "%s-%%.*s ESMTP%%s", greetcode); 446 message(cmdbuf, (int) (id - inp), inp, id); 447 448 /* output remaining lines */ 449 while ((id = p) != NULL && (p = strchr(id, '\n')) != NULL) 450 { 451 *p++ = '\0'; 452 if (isascii(*id) && isspace(*id)) 453 id++; 454 (void) snprintf(cmdbuf, sizeof cmdbuf, "%s-%%s", greetcode); 455 message(cmdbuf, id); 456 } 457 if (id != NULL) 458 { 459 if (isascii(*id) && isspace(*id)) 460 id++; 461 (void) snprintf(cmdbuf, sizeof cmdbuf, "%s %%s", greetcode); 462 message(cmdbuf, id); 463 } 464 465 protocol = NULL; 466 sendinghost = macvalue('s', e); 467 gothello = FALSE; 468 gotmail = FALSE; 469 for (;;) 470 { 471 /* arrange for backout */ 472 (void) setjmp(TopFrame); 473 QuickAbort = FALSE; 474 HoldErrs = FALSE; 475 SuprErrs = FALSE; 476 LogUsrErrs = FALSE; 477 OnlyOneError = TRUE; 478 e->e_flags &= ~(EF_VRFYONLY|EF_GLOBALERRS); 479 480 /* setup for the read */ 481 e->e_to = NULL; 482 Errors = 0; 483 FileName = NULL; 484 (void) fflush(stdout); 485 486 /* read the input line */ 487 SmtpPhase = "server cmd read"; 488 sm_setproctitle(TRUE, e, "server %s cmd read", CurSmtpClient); 489 # if SASL 490 /* 491 ** SMTP AUTH requires accepting any length, 492 ** at least for challenge/response 493 ** XXX 494 */ 495 # endif /* SASL */ 496 497 /* handle errors */ 498 if (ferror(OutChannel) || 499 (p = sfgets(inp, sizeof inp, InChannel, 500 TimeOuts.to_nextcommand, SmtpPhase)) == NULL) 501 { 502 char *d; 503 504 d = macvalue(macid("{daemon_name}", NULL), e); 505 if (d == NULL) 506 d = "stdin"; 507 /* end of file, just die */ 508 disconnect(1, e); 509 510 # if _FFR_MILTER 511 /* close out milter filters */ 512 milter_quit(e); 513 # endif /* _FFR_MILTER */ 514 515 message("421 4.4.1 %s Lost input channel from %s", 516 MyHostName, CurSmtpClient); 517 if (LogLevel > (gotmail ? 1 : 19)) 518 sm_syslog(LOG_NOTICE, e->e_id, 519 "lost input channel from %.100s to %s after %s", 520 CurSmtpClient, d, 521 (c == NULL || c->cmd_name == NULL) ? "startup" : c->cmd_name); 522 /* 523 ** If have not accepted mail (DATA), do not bounce 524 ** bad addresses back to sender. 525 */ 526 527 if (bitset(EF_CLRQUEUE, e->e_flags)) 528 e->e_sendqueue = NULL; 529 goto doquit; 530 } 531 532 /* clean up end of line */ 533 fixcrlf(inp, TRUE); 534 535 # if SASL 536 if (authenticating == SASL_PROC_AUTH) 537 { 538 # if 0 539 if (*inp == '\0') 540 { 541 authenticating = SASL_NOT_AUTH; 542 message("501 5.5.2 missing input"); 543 continue; 544 } 545 # endif /* 0 */ 546 if (*inp == '*' && *(inp + 1) == '\0') 547 { 548 authenticating = SASL_NOT_AUTH; 549 550 /* rfc 2254 4. */ 551 message("501 5.0.0 AUTH aborted"); 552 continue; 553 } 554 555 /* could this be shorter? XXX */ 556 out = xalloc(strlen(inp)); 557 result = sasl_decode64(inp, strlen(inp), out, &outlen); 558 if (result != SASL_OK) 559 { 560 authenticating = SASL_NOT_AUTH; 561 562 /* rfc 2254 4. */ 563 message("501 5.5.4 cannot decode AUTH parameter %s", 564 inp); 565 continue; 566 } 567 568 result = sasl_server_step(conn, out, outlen, 569 &out, &outlen, &errstr); 570 571 /* get an OK if we're done */ 572 if (result == SASL_OK) 573 { 574 authenticated: 575 message("235 2.0.0 OK Authenticated"); 576 authenticating = SASL_IS_AUTH; 577 define(macid("{auth_type}", NULL), 578 newstr(auth_type), &BlankEnvelope); 579 580 result = sasl_getprop(conn, SASL_USERNAME, 581 (void **)&user); 582 if (result != SASL_OK) 583 { 584 user = ""; 585 define(macid("{auth_authen}", NULL), 586 NULL, &BlankEnvelope); 587 } 588 else 589 { 590 define(macid("{auth_authen}", NULL), 591 newstr(user), &BlankEnvelope); 592 } 593 594 # if 0 595 /* get realm? */ 596 sasl_getprop(conn, SASL_REALM, (void **) &data); 597 # endif /* 0 */ 598 599 600 # if SFIO 601 /* get security strength (features) */ 602 result = sasl_getprop(conn, SASL_SSF, 603 (void **) &ssf); 604 if (result != SASL_OK) 605 { 606 define(macid("{auth_ssf}", NULL), 607 "0", &BlankEnvelope); 608 ssf = NULL; 609 } 610 else 611 { 612 char pbuf[8]; 613 614 snprintf(pbuf, sizeof pbuf, "%u", *ssf); 615 define(macid("{auth_ssf}", NULL), 616 newstr(pbuf), &BlankEnvelope); 617 if (tTd(95, 8)) 618 dprintf("SASL auth_ssf: %u\n", 619 *ssf); 620 } 621 /* 622 ** only switch to encrypted connection 623 ** if a security layer has been negotiated 624 */ 625 if (ssf != NULL && *ssf > 0) 626 { 627 /* 628 ** convert sfio stuff to use SASL 629 ** check return values 630 ** if the call fails, 631 ** fall back to unencrypted version 632 ** unless some cf option requires 633 ** encryption then the connection must 634 ** be aborted 635 */ 636 if (sfdcsasl(InChannel, OutChannel, 637 conn) == 0) 638 { 639 /* restart dialogue */ 640 gothello = FALSE; 641 OneXact = TRUE; 642 n_helo = 0; 643 } 644 else 645 syserr("503 5.3.3 SASL TLS failed"); 646 if (LogLevel > 9) 647 sm_syslog(LOG_INFO, 648 NOQID, 649 "SASL: connection from %.64s: mech=%.16s, id=%.64s, bits=%d", 650 CurSmtpClient, 651 auth_type, user, 652 *ssf); 653 } 654 # else /* SFIO */ 655 if (LogLevel > 9) 656 sm_syslog(LOG_INFO, NOQID, 657 "SASL: connection from %.64s: mech=%.16s, id=%.64s", 658 CurSmtpClient, auth_type, 659 user); 660 # endif /* SFIO */ 661 } 662 else if (result == SASL_CONTINUE) 663 { 664 len = ENC64LEN(outlen); 665 out2 = xalloc(len); 666 result = sasl_encode64(out, outlen, out2, len, 667 (u_int *)&out2len); 668 if (result != SASL_OK) 669 { 670 /* correct code? XXX */ 671 /* 454 Temp. authentication failure */ 672 message("454 4.5.4 Internal error: unable to encode64"); 673 if (LogLevel > 5) 674 sm_syslog(LOG_WARNING, e->e_id, 675 "SASL encode64 error [%d for \"%s\"]", 676 result, out); 677 /* start over? */ 678 authenticating = SASL_NOT_AUTH; 679 } 680 else 681 { 682 message("334 %s", out2); 683 if (tTd(95, 2)) 684 dprintf("SASL continue: msg='%s' len=%d\n", 685 out2, out2len); 686 } 687 } 688 else 689 { 690 /* not SASL_OK or SASL_CONT */ 691 message("500 5.7.0 authentication failed"); 692 if (LogLevel > 9) 693 sm_syslog(LOG_WARNING, e->e_id, 694 "AUTH failure (%s): %s (%d)", 695 auth_type, 696 sasl_errstring(result, NULL, 697 NULL), 698 result); 699 authenticating = SASL_NOT_AUTH; 700 } 701 } 702 else 703 { 704 /* don't want to do any of this if authenticating */ 705 # endif /* SASL */ 706 707 /* echo command to transcript */ 708 if (e->e_xfp != NULL) 709 fprintf(e->e_xfp, "<<< %s\n", inp); 710 711 if (LogLevel >= 15) 712 sm_syslog(LOG_INFO, e->e_id, 713 "<-- %s", 714 inp); 715 716 if (e->e_id == NULL) 717 sm_setproctitle(TRUE, e, "%s: %.80s", 718 CurSmtpClient, inp); 719 else 720 sm_setproctitle(TRUE, e, "%s %s: %.80s", 721 qid_printname(e), 722 CurSmtpClient, inp); 723 724 /* break off command */ 725 for (p = inp; isascii(*p) && isspace(*p); p++) 726 continue; 727 cmd = cmdbuf; 728 while (*p != '\0' && 729 !(isascii(*p) && isspace(*p)) && 730 cmd < &cmdbuf[sizeof cmdbuf - 2]) 731 *cmd++ = *p++; 732 *cmd = '\0'; 733 734 /* throw away leading whitespace */ 735 while (isascii(*p) && isspace(*p)) 736 p++; 737 738 /* decode command */ 739 for (c = CmdTab; c->cmd_name != NULL; c++) 740 { 741 if (strcasecmp(c->cmd_name, cmdbuf) == 0) 742 break; 743 } 744 745 /* reset errors */ 746 errno = 0; 747 748 /* 749 ** Process command. 750 ** 751 ** If we are running as a null server, return 550 752 ** to everything. 753 */ 754 755 if (nullserver != NULL || bitnset(D_ETRNONLY, d_flags)) 756 { 757 switch (c->cmd_code) 758 { 759 case CMDQUIT: 760 case CMDHELO: 761 case CMDEHLO: 762 case CMDNOOP: 763 case CMDRSET: 764 /* process normally */ 765 break; 766 767 case CMDETRN: 768 if (bitnset(D_ETRNONLY, d_flags) && 769 nullserver == NULL) 770 break; 771 continue; 772 773 default: 774 if (++badcommands > MAXBADCOMMANDS) 775 { 776 delay *= 2; 777 if (delay >= MAXTIMEOUT) 778 delay = MAXTIMEOUT; 779 (void) sleep(delay); 780 } 781 if (nullserver != NULL) 782 { 783 if (ISSMTPREPLY(nullserver)) 784 usrerr(nullserver); 785 else 786 usrerr("550 5.0.0 %s", nullserver); 787 } 788 else 789 usrerr("452 4.4.5 Insufficient disk space; try again later"); 790 continue; 791 } 792 } 793 794 /* non-null server */ 795 switch (c->cmd_code) 796 { 797 case CMDMAIL: 798 case CMDEXPN: 799 case CMDVRFY: 800 case CMDETRN: 801 lognullconnection = FALSE; 802 } 803 804 switch (c->cmd_code) 805 { 806 # if SASL 807 case CMDAUTH: /* sasl */ 808 if (!sasl_ok) 809 { 810 message("503 5.3.3 AUTH not available"); 811 break; 812 } 813 if (authenticating == SASL_IS_AUTH) 814 { 815 message("503 5.5.0 Already Authenticated"); 816 break; 817 } 818 if (gotmail) 819 { 820 message("503 5.5.0 AUTH not permitted during a mail transaction"); 821 break; 822 } 823 if (tempfail) 824 { 825 if (LogLevel > 9) 826 sm_syslog(LOG_INFO, e->e_id, 827 "SMTP AUTH command (%.100s) from %.100s tempfailed (due to previous checks)", 828 p, CurSmtpClient); 829 usrerr("454 4.7.1 Please try again later"); 830 break; 831 } 832 833 ismore = FALSE; 834 835 /* crude way to avoid crack attempts */ 836 (void) checksmtpattack(&n_auth, n_mechs + 1, TRUE, 837 "AUTH", e); 838 839 /* make sure it's a valid string */ 840 for (q = p; *q != '\0' && isascii(*q); q++) 841 { 842 if (isspace(*q)) 843 { 844 *q = '\0'; 845 while (*++q != '\0' && 846 isascii(*q) && isspace(*q)) 847 continue; 848 *(q - 1) = '\0'; 849 ismore = (*q != '\0'); 850 break; 851 } 852 } 853 854 /* check whether mechanism is available */ 855 if (iteminlist(p, mechlist, " ") == NULL) 856 { 857 message("503 5.3.3 AUTH mechanism %s not available", 858 p); 859 break; 860 } 861 862 if (ismore) 863 { 864 /* could this be shorter? XXX */ 865 in = xalloc(strlen(q)); 866 result = sasl_decode64(q, strlen(q), in, 867 (u_int *)&inlen); 868 if (result != SASL_OK) 869 { 870 message("501 5.5.4 cannot BASE64 decode '%s'", 871 q); 872 if (LogLevel > 5) 873 sm_syslog(LOG_WARNING, e->e_id, 874 "SASL decode64 error [%d for \"%s\"]", 875 result, q); 876 /* start over? */ 877 authenticating = SASL_NOT_AUTH; 878 in = NULL; 879 inlen = 0; 880 break; 881 } 882 # if 0 883 if (tTd(95, 99)) 884 { 885 int i; 886 887 dprintf("AUTH: more \""); 888 for (i = 0; i < inlen; i++) 889 { 890 if (isascii(in[i]) && 891 isprint(in[i])) 892 dprintf("%c", in[i]); 893 else 894 dprintf("_"); 895 } 896 dprintf("\"\n"); 897 } 898 # endif /* 0 */ 899 } 900 else 901 { 902 in = NULL; 903 inlen = 0; 904 } 905 906 /* see if that auth type exists */ 907 result = sasl_server_start(conn, p, in, inlen, 908 &out, &outlen, &errstr); 909 910 if (result != SASL_OK && result != SASL_CONTINUE) 911 { 912 message("500 5.7.0 authentication failed"); 913 if (LogLevel > 9) 914 sm_syslog(LOG_ERR, e->e_id, 915 "AUTH failure (%s): %s (%d)", 916 p, 917 sasl_errstring(result, NULL, 918 NULL), 919 result); 920 break; 921 } 922 auth_type = newstr(p); 923 924 if (result == SASL_OK) 925 { 926 /* ugly, but same code */ 927 goto authenticated; 928 /* authenticated by the initial response */ 929 } 930 931 /* len is at least 2 */ 932 len = ENC64LEN(outlen); 933 out2 = xalloc(len); 934 result = sasl_encode64(out, outlen, out2, len, 935 (u_int *)&out2len); 936 937 if (result != SASL_OK) 938 { 939 message("454 4.5.4 Temporary authentication failure"); 940 if (LogLevel > 5) 941 sm_syslog(LOG_WARNING, e->e_id, 942 "SASL encode64 error [%d for \"%s\"]", 943 result, out); 944 945 /* start over? */ 946 authenticating = SASL_NOT_AUTH; 947 } 948 else 949 { 950 message("334 %s", out2); 951 authenticating = SASL_PROC_AUTH; 952 } 953 954 break; 955 # endif /* SASL */ 956 957 # if STARTTLS 958 case CMDSTLS: /* starttls */ 959 if (*p != '\0') 960 { 961 message("501 5.5.2 Syntax error (no parameters allowed)"); 962 break; 963 } 964 if (!usetls) 965 { 966 message("503 5.5.0 TLS not available"); 967 break; 968 } 969 if (!tls_ok) 970 { 971 message("454 4.3.3 TLS not available after start"); 972 break; 973 } 974 if (gotmail) 975 { 976 message("503 5.5.0 TLS not permitted during a mail transaction"); 977 break; 978 } 979 if (tempfail) 980 { 981 if (LogLevel > 9) 982 sm_syslog(LOG_INFO, e->e_id, 983 "SMTP STARTTLS command (%.100s) from %.100s tempfailed (due to previous checks)", 984 p, CurSmtpClient); 985 usrerr("454 4.7.1 Please try again later"); 986 break; 987 } 988 # if TLS_NO_RSA 989 /* 990 ** XXX do we need a temp key ? 991 */ 992 # else /* TLS_NO_RSA */ 993 if (SSL_CTX_need_tmp_RSA(srv_ctx) && 994 !SSL_CTX_set_tmp_rsa(srv_ctx, 995 (rsa = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, 996 NULL, NULL))) 997 ) 998 { 999 message("454 4.3.3 TLS not available: error generating RSA temp key"); 1000 if (rsa != NULL) 1001 RSA_free(rsa); 1002 break; 1003 } 1004 # endif /* TLS_NO_RSA */ 1005 if (srv_ssl != NULL) 1006 SSL_clear(srv_ssl); 1007 else if ((srv_ssl = SSL_new(srv_ctx)) == NULL) 1008 { 1009 message("454 4.3.3 TLS not available: error generating SSL handle"); 1010 break; 1011 } 1012 rfd = fileno(InChannel); 1013 wfd = fileno(OutChannel); 1014 if (rfd < 0 || wfd < 0 || 1015 SSL_set_rfd(srv_ssl, rfd) <= 0 || 1016 SSL_set_wfd(srv_ssl, wfd) <= 0) 1017 { 1018 message("454 4.3.3 TLS not available: error set fd"); 1019 SSL_free(srv_ssl); 1020 srv_ssl = NULL; 1021 break; 1022 } 1023 message("220 2.0.0 Ready to start TLS"); 1024 SSL_set_accept_state(srv_ssl); 1025 1026 # define SSL_ACC(s) SSL_accept(s) 1027 if ((r = SSL_ACC(srv_ssl)) <= 0) 1028 { 1029 int i; 1030 1031 /* what to do in this case? */ 1032 i = SSL_get_error(srv_ssl, r); 1033 if (LogLevel > 5) 1034 { 1035 sm_syslog(LOG_WARNING, e->e_id, 1036 "TLS: error: accept failed=%d (%d)", 1037 r, i); 1038 if (LogLevel > 9) 1039 tlslogerr(); 1040 } 1041 tls_ok = FALSE; 1042 SSL_free(srv_ssl); 1043 srv_ssl = NULL; 1044 1045 /* 1046 ** according to the next draft of 1047 ** RFC 2487 the connection should be dropped 1048 */ 1049 1050 /* arrange to ignore any current send list */ 1051 e->e_sendqueue = NULL; 1052 goto doquit; 1053 } 1054 1055 /* ignore return code for now, it's in {verify} */ 1056 (void) tls_get_info(srv_ssl, &BlankEnvelope, TRUE, 1057 CurSmtpClient, TRUE); 1058 1059 /* 1060 ** call Stls_client to find out whether 1061 ** to accept the connection from the client 1062 */ 1063 1064 saveQuickAbort = QuickAbort; 1065 saveSuprErrs = SuprErrs; 1066 SuprErrs = TRUE; 1067 QuickAbort = FALSE; 1068 if (rscheck("tls_client", 1069 macvalue(macid("{verify}", NULL), e), 1070 "STARTTLS", e, TRUE, TRUE, 6, NULL) != 1071 EX_OK || Errors > 0) 1072 { 1073 extern char MsgBuf[]; 1074 1075 if (MsgBuf[0] != '\0' && ISSMTPREPLY(MsgBuf)) 1076 nullserver = newstr(MsgBuf); 1077 else 1078 nullserver = "503 5.7.0 Authentication required."; 1079 } 1080 QuickAbort = saveQuickAbort; 1081 SuprErrs = saveSuprErrs; 1082 1083 tls_ok = FALSE; /* don't offer STARTTLS again */ 1084 gothello = FALSE; /* discard info */ 1085 n_helo = 0; 1086 OneXact = TRUE; /* only one xaction this run */ 1087 # if SASL 1088 if (sasl_ok) 1089 { 1090 char *s; 1091 1092 if ((s = macvalue(macid("{cipher_bits}", NULL), e)) != NULL && 1093 (ext_ssf.ssf = atoi(s)) > 0) 1094 { 1095 # if _FFR_EXT_MECH 1096 ext_ssf.auth_id = macvalue(macid("{cert_subject}", 1097 NULL), 1098 e); 1099 # endif /* _FFR_EXT_MECH */ 1100 sasl_ok = sasl_setprop(conn, SASL_SSF_EXTERNAL, 1101 &ext_ssf) == SASL_OK; 1102 if (mechlist != NULL) 1103 free(mechlist); 1104 mechlist = NULL; 1105 if (sasl_ok) 1106 { 1107 n_mechs = saslmechs(conn, 1108 &mechlist); 1109 sasl_ok = n_mechs > 0; 1110 } 1111 } 1112 } 1113 # endif /* SASL */ 1114 1115 /* switch to secure connection */ 1116 #if SFIO 1117 r = sfdctls(InChannel, OutChannel, srv_ssl); 1118 #else /* SFIO */ 1119 # if _FFR_TLS_TOREK 1120 r = sfdctls(&InChannel, &OutChannel, srv_ssl); 1121 # endif /* _FFR_TLS_TOREK */ 1122 #endif /* SFIO */ 1123 if (r == 0) 1124 tls_active = TRUE; 1125 else 1126 { 1127 /* 1128 ** XXX this is an internal error 1129 ** how to deal with it? 1130 ** we can't generate an error message 1131 ** since the other side switched to an 1132 ** encrypted layer, but we could not... 1133 ** just "hang up"? 1134 */ 1135 nullserver = "454 4.3.3 TLS not available: can't switch to encrypted layer"; 1136 syserr("TLS: can't switch to encrypted layer"); 1137 } 1138 break; 1139 # endif /* STARTTLS */ 1140 1141 case CMDHELO: /* hello -- introduce yourself */ 1142 case CMDEHLO: /* extended hello */ 1143 if (c->cmd_code == CMDEHLO) 1144 { 1145 protocol = "ESMTP"; 1146 SmtpPhase = "server EHLO"; 1147 } 1148 else 1149 { 1150 protocol = "SMTP"; 1151 SmtpPhase = "server HELO"; 1152 } 1153 1154 /* avoid denial-of-service */ 1155 (void) checksmtpattack(&n_helo, MAXHELOCOMMANDS, TRUE, 1156 "HELO/EHLO", e); 1157 1158 /* check for duplicate HELO/EHLO per RFC 1651 4.2 */ 1159 if (gothello) 1160 { 1161 usrerr("503 %s Duplicate HELO/EHLO", 1162 MyHostName); 1163 break; 1164 } 1165 1166 /* check for valid domain name (re 1123 5.2.5) */ 1167 if (*p == '\0' && !AllowBogusHELO) 1168 { 1169 usrerr("501 %s requires domain address", 1170 cmdbuf); 1171 break; 1172 } 1173 1174 /* check for long domain name (hides Received: info) */ 1175 if (strlen(p) > MAXNAME) 1176 { 1177 usrerr("501 Invalid domain name"); 1178 if (LogLevel > 9) 1179 sm_syslog(LOG_INFO, CurEnv->e_id, 1180 "invalid domain name (too long) from %.100s", 1181 CurSmtpClient); 1182 break; 1183 } 1184 1185 for (q = p; *q != '\0'; q++) 1186 { 1187 if (!isascii(*q)) 1188 break; 1189 if (isalnum(*q)) 1190 continue; 1191 if (isspace(*q)) 1192 { 1193 *q = '\0'; 1194 break; 1195 } 1196 if (strchr("[].-_#", *q) == NULL) 1197 break; 1198 } 1199 1200 if (*q == '\0') 1201 { 1202 q = "pleased to meet you"; 1203 sendinghost = newstr(p); 1204 } 1205 else if (!AllowBogusHELO) 1206 { 1207 usrerr("501 Invalid domain name"); 1208 if (LogLevel > 9) 1209 sm_syslog(LOG_INFO, CurEnv->e_id, 1210 "invalid domain name (%.100s) from %.100s", 1211 p, CurSmtpClient); 1212 break; 1213 } 1214 else 1215 { 1216 q = "accepting invalid domain name"; 1217 } 1218 1219 gothello = TRUE; 1220 1221 # if _FFR_MILTER 1222 if (milterize && !bitset(EF_DISCARD, e->e_flags)) 1223 { 1224 char state; 1225 char *response; 1226 1227 response = milter_helo(p, e, &state); 1228 switch (state) 1229 { 1230 case SMFIR_REPLYCODE: 1231 nullserver = response; 1232 milterize = FALSE; 1233 break; 1234 1235 case SMFIR_REJECT: 1236 nullserver = "Command rejected"; 1237 milterize = FALSE; 1238 break; 1239 1240 case SMFIR_TEMPFAIL: 1241 tempfail = TRUE; 1242 milterize = FALSE; 1243 break; 1244 } 1245 } 1246 # endif /* _FFR_MILTER */ 1247 1248 /* print HELO response message */ 1249 if (c->cmd_code != CMDEHLO) 1250 { 1251 message("250 %s Hello %s, %s", 1252 MyHostName, CurSmtpClient, q); 1253 break; 1254 } 1255 1256 message("250-%s Hello %s, %s", 1257 MyHostName, CurSmtpClient, q); 1258 1259 /* offer ENHSC even for nullserver */ 1260 if (nullserver != NULL) 1261 { 1262 message("250 ENHANCEDSTATUSCODES"); 1263 break; 1264 } 1265 1266 /* 1267 ** print EHLO features list 1268 ** 1269 ** Note: If you change this list, 1270 ** remember to update 'helpfile' 1271 */ 1272 1273 1274 message("250-ENHANCEDSTATUSCODES"); 1275 if (!bitset(PRIV_NOEXPN, PrivacyFlags)) 1276 { 1277 message("250-EXPN"); 1278 if (!bitset(PRIV_NOVERB, PrivacyFlags)) 1279 message("250-VERB"); 1280 } 1281 # if MIME8TO7 1282 message("250-8BITMIME"); 1283 # endif /* MIME8TO7 */ 1284 if (MaxMessageSize > 0) 1285 message("250-SIZE %ld", MaxMessageSize); 1286 else 1287 message("250-SIZE"); 1288 # if DSN 1289 if (SendMIMEErrors && 1290 !bitset(PRIV_NORECEIPTS, PrivacyFlags)) 1291 message("250-DSN"); 1292 # endif /* DSN */ 1293 message("250-ONEX"); 1294 if (!bitset(PRIV_NOETRN, PrivacyFlags) && 1295 !bitnset(D_NOETRN, d_flags)) 1296 message("250-ETRN"); 1297 message("250-XUSR"); 1298 1299 # if SASL 1300 if (sasl_ok && mechlist != NULL && *mechlist != '\0') 1301 message("250-AUTH %s", mechlist); 1302 # endif /* SASL */ 1303 # if STARTTLS 1304 if (tls_ok && usetls) 1305 message("250-STARTTLS"); 1306 # endif /* STARTTLS */ 1307 message("250 HELP"); 1308 break; 1309 1310 case CMDMAIL: /* mail -- designate sender */ 1311 SmtpPhase = "server MAIL"; 1312 1313 /* check for validity of this command */ 1314 if (!gothello && bitset(PRIV_NEEDMAILHELO, PrivacyFlags)) 1315 { 1316 usrerr("503 5.0.0 Polite people say HELO first"); 1317 break; 1318 } 1319 if (gotmail) 1320 { 1321 usrerr("503 5.5.0 Sender already specified"); 1322 break; 1323 } 1324 if (InChild) 1325 { 1326 errno = 0; 1327 syserr("503 5.5.0 Nested MAIL command: MAIL %s", p); 1328 finis(TRUE, ExitStat); 1329 } 1330 # if SASL 1331 if (bitnset(D_AUTHREQ, d_flags) && 1332 authenticating != SASL_IS_AUTH) 1333 { 1334 usrerr("530 5.7.0 Authentication required"); 1335 break; 1336 } 1337 # endif /* SASL */ 1338 1339 p = skipword(p, "from"); 1340 if (p == NULL) 1341 break; 1342 if (tempfail) 1343 { 1344 if (LogLevel > 9) 1345 sm_syslog(LOG_INFO, e->e_id, 1346 "SMTP MAIL command (%.100s) from %.100s tempfailed (due to previous checks)", 1347 p, CurSmtpClient); 1348 usrerr("451 4.7.1 Please try again later"); 1349 break; 1350 } 1351 1352 /* make sure we know who the sending host is */ 1353 if (sendinghost == NULL) 1354 sendinghost = peerhostname; 1355 1356 1357 /* fork a subprocess to process this command */ 1358 ric = runinchild("SMTP-MAIL", e); 1359 1360 /* Catch a problem and stop processing */ 1361 if (ric == RIC_TEMPFAIL && nullserver == NULL) 1362 nullserver = "452 4.3.0 Internal software error"; 1363 if (ric != RIC_INCHILD) 1364 break; 1365 1366 if (Errors > 0) 1367 goto undo_subproc_no_pm; 1368 if (!gothello) 1369 { 1370 auth_warning(e, 1371 "%s didn't use HELO protocol", 1372 CurSmtpClient); 1373 } 1374 # ifdef PICKY_HELO_CHECK 1375 if (strcasecmp(sendinghost, peerhostname) != 0 && 1376 (strcasecmp(peerhostname, "localhost") != 0 || 1377 strcasecmp(sendinghost, MyHostName) != 0)) 1378 { 1379 auth_warning(e, "Host %s claimed to be %s", 1380 CurSmtpClient, sendinghost); 1381 } 1382 # endif /* PICKY_HELO_CHECK */ 1383 1384 if (protocol == NULL) 1385 protocol = "SMTP"; 1386 define('r', protocol, e); 1387 define('s', sendinghost, e); 1388 1389 if (Errors > 0) 1390 goto undo_subproc_no_pm; 1391 nrcpts = 0; 1392 define(macid("{ntries}", NULL), "0", e); 1393 e->e_flags |= EF_CLRQUEUE; 1394 sm_setproctitle(TRUE, e, "%s %s: %.80s", 1395 qid_printname(e), 1396 CurSmtpClient, inp); 1397 1398 /* child -- go do the processing */ 1399 if (setjmp(TopFrame) > 0) 1400 { 1401 /* this failed -- undo work */ 1402 undo_subproc_no_pm: 1403 e->e_flags &= ~EF_PM_NOTIFY; 1404 undo_subproc: 1405 if (InChild) 1406 { 1407 QuickAbort = FALSE; 1408 SuprErrs = TRUE; 1409 e->e_flags &= ~EF_FATALERRS; 1410 1411 if (LogLevel > 4 && 1412 bitset(EF_LOGSENDER, e->e_flags)) 1413 logsender(e, NULL); 1414 e->e_flags &= ~EF_LOGSENDER; 1415 1416 finis(TRUE, ExitStat); 1417 } 1418 break; 1419 } 1420 QuickAbort = TRUE; 1421 1422 /* must parse sender first */ 1423 delimptr = NULL; 1424 setsender(p, e, &delimptr, ' ', FALSE); 1425 if (delimptr != NULL && *delimptr != '\0') 1426 *delimptr++ = '\0'; 1427 if (Errors > 0) 1428 goto undo_subproc_no_pm; 1429 1430 /* Successfully set e_from, allow logging */ 1431 e->e_flags |= EF_LOGSENDER; 1432 1433 /* put resulting triple from parseaddr() into macros */ 1434 if (e->e_from.q_mailer != NULL) 1435 define(macid("{mail_mailer}", NULL), 1436 e->e_from.q_mailer->m_name, e); 1437 else 1438 define(macid("{mail_mailer}", NULL), 1439 NULL, e); 1440 if (e->e_from.q_host != NULL) 1441 define(macid("{mail_host}", NULL), 1442 e->e_from.q_host, e); 1443 else 1444 define(macid("{mail_host}", NULL), 1445 "localhost", e); 1446 if (e->e_from.q_user != NULL) 1447 define(macid("{mail_addr}", NULL), 1448 e->e_from.q_user, e); 1449 else 1450 define(macid("{mail_addr}", NULL), 1451 NULL, e); 1452 if (Errors > 0) 1453 goto undo_subproc_no_pm; 1454 1455 /* check for possible spoofing */ 1456 if (RealUid != 0 && OpMode == MD_SMTP && 1457 !wordinclass(RealUserName, 't') && 1458 (!bitnset(M_LOCALMAILER, 1459 e->e_from.q_mailer->m_flags) || 1460 strcmp(e->e_from.q_user, RealUserName) != 0)) 1461 { 1462 auth_warning(e, "%s owned process doing -bs", 1463 RealUserName); 1464 } 1465 1466 /* now parse ESMTP arguments */ 1467 e->e_msgsize = 0; 1468 addr = p; 1469 argno = 0; 1470 args[argno++] = p; 1471 p = delimptr; 1472 while (p != NULL && *p != '\0') 1473 { 1474 char *kp; 1475 char *vp = NULL; 1476 char *equal = NULL; 1477 1478 /* locate the beginning of the keyword */ 1479 while (isascii(*p) && isspace(*p)) 1480 p++; 1481 if (*p == '\0') 1482 break; 1483 kp = p; 1484 1485 /* skip to the value portion */ 1486 while ((isascii(*p) && isalnum(*p)) || *p == '-') 1487 p++; 1488 if (*p == '=') 1489 { 1490 equal = p; 1491 *p++ = '\0'; 1492 vp = p; 1493 1494 /* skip to the end of the value */ 1495 while (*p != '\0' && *p != ' ' && 1496 !(isascii(*p) && iscntrl(*p)) && 1497 *p != '=') 1498 p++; 1499 } 1500 1501 if (*p != '\0') 1502 *p++ = '\0'; 1503 1504 if (tTd(19, 1)) 1505 dprintf("MAIL: got arg %s=\"%s\"\n", kp, 1506 vp == NULL ? "<null>" : vp); 1507 1508 mail_esmtp_args(kp, vp, e); 1509 if (equal != NULL) 1510 *equal = '='; 1511 args[argno++] = kp; 1512 if (argno >= MAXSMTPARGS - 1) 1513 usrerr("501 5.5.4 Too many parameters"); 1514 if (Errors > 0) 1515 goto undo_subproc_no_pm; 1516 } 1517 args[argno] = NULL; 1518 if (Errors > 0) 1519 goto undo_subproc_no_pm; 1520 1521 /* do config file checking of the sender */ 1522 if (rscheck("check_mail", addr, 1523 NULL, e, TRUE, TRUE, 4, NULL) != EX_OK || 1524 Errors > 0) 1525 goto undo_subproc_no_pm; 1526 1527 if (MaxMessageSize > 0 && 1528 (e->e_msgsize > MaxMessageSize || e->e_msgsize < 0)) 1529 { 1530 usrerr("552 5.2.3 Message size exceeds fixed maximum message size (%ld)", 1531 MaxMessageSize); 1532 goto undo_subproc_no_pm; 1533 } 1534 1535 if (!enoughdiskspace(e->e_msgsize, TRUE)) 1536 { 1537 usrerr("452 4.4.5 Insufficient disk space; try again later"); 1538 goto undo_subproc_no_pm; 1539 } 1540 if (Errors > 0) 1541 goto undo_subproc_no_pm; 1542 1543 # if _FFR_MILTER 1544 LogUsrErrs = TRUE; 1545 if (milterize && !bitset(EF_DISCARD, e->e_flags)) 1546 { 1547 char state; 1548 char *response; 1549 1550 response = milter_envfrom(args, e, &state); 1551 switch (state) 1552 { 1553 case SMFIR_REPLYCODE: 1554 usrerr(response); 1555 break; 1556 1557 case SMFIR_REJECT: 1558 usrerr("550 5.7.1 Command rejected"); 1559 break; 1560 1561 case SMFIR_DISCARD: 1562 e->e_flags |= EF_DISCARD; 1563 break; 1564 1565 case SMFIR_TEMPFAIL: 1566 usrerr("451 4.7.1 Please try again later"); 1567 break; 1568 } 1569 if (response != NULL) 1570 free(response); 1571 } 1572 # endif /* _FFR_MILTER */ 1573 if (Errors > 0) 1574 goto undo_subproc_no_pm; 1575 1576 message("250 2.1.0 Sender ok"); 1577 gotmail = TRUE; 1578 break; 1579 1580 case CMDRCPT: /* rcpt -- designate recipient */ 1581 if (!gotmail) 1582 { 1583 usrerr("503 5.0.0 Need MAIL before RCPT"); 1584 break; 1585 } 1586 SmtpPhase = "server RCPT"; 1587 if (setjmp(TopFrame) > 0) 1588 { 1589 e->e_flags &= ~(EF_FATALERRS|EF_PM_NOTIFY); 1590 break; 1591 } 1592 QuickAbort = TRUE; 1593 LogUsrErrs = TRUE; 1594 1595 /* limit flooding of our machine */ 1596 if (MaxRcptPerMsg > 0 && nrcpts >= MaxRcptPerMsg) 1597 { 1598 usrerr("452 4.5.3 Too many recipients"); 1599 break; 1600 } 1601 1602 if (e->e_sendmode != SM_DELIVER) 1603 e->e_flags |= EF_VRFYONLY; 1604 1605 # if _FFR_MILTER 1606 /* 1607 ** If the filter will be deleting recipients, 1608 ** don't expand them at RCPT time (in the call 1609 ** to recipient()). If they are expanded, it 1610 ** is impossible for removefromlist() to figure 1611 ** out the expanded members of the original 1612 ** recipient and mark them as QS_DONTSEND. 1613 */ 1614 1615 if (milter_can_delrcpts()) 1616 e->e_flags |= EF_VRFYONLY; 1617 # endif /* _FFR_MILTER */ 1618 1619 p = skipword(p, "to"); 1620 if (p == NULL) 1621 break; 1622 # if _FFR_ADDR_TYPE 1623 define(macid("{addr_type}", NULL), "e r", e); 1624 # endif /* _FFR_ADDR_TYPE */ 1625 a = parseaddr(p, NULLADDR, RF_COPYALL, ' ', &delimptr, e); 1626 #if _FFR_ADDR_TYPE 1627 define(macid("{addr_type}", NULL), NULL, e); 1628 #endif /* _FFR_ADDR_TYPE */ 1629 if (Errors > 0) 1630 break; 1631 if (a == NULL) 1632 { 1633 usrerr("501 5.0.0 Missing recipient"); 1634 break; 1635 } 1636 1637 if (delimptr != NULL && *delimptr != '\0') 1638 *delimptr++ = '\0'; 1639 1640 /* put resulting triple from parseaddr() into macros */ 1641 if (a->q_mailer != NULL) 1642 define(macid("{rcpt_mailer}", NULL), 1643 a->q_mailer->m_name, e); 1644 else 1645 define(macid("{rcpt_mailer}", NULL), 1646 NULL, e); 1647 if (a->q_host != NULL) 1648 define(macid("{rcpt_host}", NULL), 1649 a->q_host, e); 1650 else 1651 define(macid("{rcpt_host}", NULL), 1652 "localhost", e); 1653 if (a->q_user != NULL) 1654 define(macid("{rcpt_addr}", NULL), 1655 a->q_user, e); 1656 else 1657 define(macid("{rcpt_addr}", NULL), 1658 NULL, e); 1659 if (Errors > 0) 1660 break; 1661 1662 /* now parse ESMTP arguments */ 1663 addr = p; 1664 argno = 0; 1665 args[argno++] = p; 1666 p = delimptr; 1667 while (p != NULL && *p != '\0') 1668 { 1669 char *kp; 1670 char *vp = NULL; 1671 char *equal = NULL; 1672 1673 /* locate the beginning of the keyword */ 1674 while (isascii(*p) && isspace(*p)) 1675 p++; 1676 if (*p == '\0') 1677 break; 1678 kp = p; 1679 1680 /* skip to the value portion */ 1681 while ((isascii(*p) && isalnum(*p)) || *p == '-') 1682 p++; 1683 if (*p == '=') 1684 { 1685 equal = p; 1686 *p++ = '\0'; 1687 vp = p; 1688 1689 /* skip to the end of the value */ 1690 while (*p != '\0' && *p != ' ' && 1691 !(isascii(*p) && iscntrl(*p)) && 1692 *p != '=') 1693 p++; 1694 } 1695 1696 if (*p != '\0') 1697 *p++ = '\0'; 1698 1699 if (tTd(19, 1)) 1700 dprintf("RCPT: got arg %s=\"%s\"\n", kp, 1701 vp == NULL ? "<null>" : vp); 1702 1703 rcpt_esmtp_args(a, kp, vp, e); 1704 if (equal != NULL) 1705 *equal = '='; 1706 args[argno++] = kp; 1707 if (argno >= MAXSMTPARGS - 1) 1708 usrerr("501 5.5.4 Too many parameters"); 1709 if (Errors > 0) 1710 break; 1711 } 1712 args[argno] = NULL; 1713 if (Errors > 0) 1714 break; 1715 1716 /* do config file checking of the recipient */ 1717 if (rscheck("check_rcpt", addr, 1718 NULL, e, TRUE, TRUE, 4, NULL) != EX_OK || 1719 Errors > 0) 1720 break; 1721 1722 # if _FFR_MILTER 1723 if (milterize && !bitset(EF_DISCARD, e->e_flags)) 1724 { 1725 char state; 1726 char *response; 1727 1728 response = milter_envrcpt(args, e, &state); 1729 switch (state) 1730 { 1731 case SMFIR_REPLYCODE: 1732 usrerr(response); 1733 break; 1734 1735 case SMFIR_REJECT: 1736 usrerr("550 5.7.1 Command rejected"); 1737 break; 1738 1739 case SMFIR_DISCARD: 1740 e->e_flags |= EF_DISCARD; 1741 break; 1742 1743 case SMFIR_TEMPFAIL: 1744 usrerr("451 4.7.1 Please try again later"); 1745 break; 1746 } 1747 if (response != NULL) 1748 free(response); 1749 } 1750 # endif /* _FFR_MILTER */ 1751 1752 define(macid("{rcpt_mailer}", NULL), NULL, e); 1753 define(macid("{rcpt_relay}", NULL), NULL, e); 1754 define(macid("{rcpt_addr}", NULL), NULL, e); 1755 define(macid("{dsn_notify}", NULL), NULL, e); 1756 if (Errors > 0) 1757 break; 1758 1759 /* save in recipient list after ESMTP mods */ 1760 a = recipient(a, &e->e_sendqueue, 0, e); 1761 if (Errors > 0) 1762 break; 1763 1764 /* no errors during parsing, but might be a duplicate */ 1765 e->e_to = a->q_paddr; 1766 if (!QS_IS_BADADDR(a->q_state)) 1767 { 1768 if (e->e_queuedir == NOQDIR) 1769 initsys(e); 1770 message("250 2.1.5 Recipient ok%s", 1771 QS_IS_QUEUEUP(a->q_state) ? 1772 " (will queue)" : ""); 1773 nrcpts++; 1774 } 1775 else 1776 { 1777 /* punt -- should keep message in ADDRESS.... */ 1778 usrerr("550 5.1.1 Addressee unknown"); 1779 } 1780 break; 1781 1782 case CMDDATA: /* data -- text of mail */ 1783 SmtpPhase = "server DATA"; 1784 if (!gotmail) 1785 { 1786 usrerr("503 5.0.0 Need MAIL command"); 1787 break; 1788 } 1789 else if (nrcpts <= 0) 1790 { 1791 usrerr("503 5.0.0 Need RCPT (recipient)"); 1792 break; 1793 } 1794 1795 /* put back discard bit */ 1796 if (discard) 1797 e->e_flags |= EF_DISCARD; 1798 1799 /* check to see if we need to re-expand aliases */ 1800 /* also reset QS_BADADDR on already-diagnosted addrs */ 1801 doublequeue = FALSE; 1802 for (a = e->e_sendqueue; a != NULL; a = a->q_next) 1803 { 1804 if (QS_IS_VERIFIED(a->q_state) && 1805 !bitset(EF_DISCARD, e->e_flags)) 1806 { 1807 /* need to re-expand aliases */ 1808 doublequeue = TRUE; 1809 } 1810 if (QS_IS_BADADDR(a->q_state)) 1811 { 1812 /* make this "go away" */ 1813 a->q_state = QS_DONTSEND; 1814 } 1815 } 1816 1817 /* collect the text of the message */ 1818 SmtpPhase = "collect"; 1819 buffer_errors(); 1820 collect(InChannel, TRUE, NULL, e); 1821 1822 # if _FFR_MILTER 1823 if (milterize && 1824 Errors <= 0 && 1825 !bitset(EF_DISCARD, e->e_flags)) 1826 { 1827 char state; 1828 char *response; 1829 1830 response = milter_data(e, &state); 1831 switch (state) 1832 { 1833 case SMFIR_REPLYCODE: 1834 usrerr(response); 1835 break; 1836 1837 case SMFIR_REJECT: 1838 usrerr("554 5.7.1 Command rejected"); 1839 break; 1840 1841 case SMFIR_DISCARD: 1842 e->e_flags |= EF_DISCARD; 1843 break; 1844 1845 case SMFIR_TEMPFAIL: 1846 usrerr("451 4.7.1 Please try again later"); 1847 break; 1848 } 1849 if (response != NULL) 1850 free(response); 1851 } 1852 1853 /* abort message filters that didn't get the body */ 1854 if (milterize) 1855 milter_abort(e); 1856 # endif /* _FFR_MILTER */ 1857 1858 /* redefine message size */ 1859 if ((q = macvalue(macid("{msg_size}", NULL), e)) 1860 != NULL) 1861 free(q); 1862 snprintf(inp, sizeof inp, "%ld", e->e_msgsize); 1863 define(macid("{msg_size}", NULL), newstr(inp), e); 1864 if (Errors > 0) 1865 { 1866 /* Log who the mail would have gone to */ 1867 if (LogLevel > 8 && 1868 e->e_message != NULL) 1869 { 1870 for (a = e->e_sendqueue; 1871 a != NULL; 1872 a = a->q_next) 1873 { 1874 if (!QS_IS_UNDELIVERED(a->q_state)) 1875 continue; 1876 1877 e->e_to = a->q_paddr; 1878 logdelivery(NULL, NULL, 1879 a->q_status, 1880 e->e_message, 1881 NULL, 1882 (time_t) 0, e); 1883 } 1884 e->e_to = NULL; 1885 } 1886 flush_errors(TRUE); 1887 buffer_errors(); 1888 goto abortmessage; 1889 } 1890 1891 /* make sure we actually do delivery */ 1892 e->e_flags &= ~EF_CLRQUEUE; 1893 1894 /* from now on, we have to operate silently */ 1895 buffer_errors(); 1896 e->e_errormode = EM_MAIL; 1897 1898 /* 1899 ** Arrange to send to everyone. 1900 ** If sending to multiple people, mail back 1901 ** errors rather than reporting directly. 1902 ** In any case, don't mail back errors for 1903 ** anything that has happened up to 1904 ** now (the other end will do this). 1905 ** Truncate our transcript -- the mail has gotten 1906 ** to us successfully, and if we have 1907 ** to mail this back, it will be easier 1908 ** on the reader. 1909 ** Then send to everyone. 1910 ** Finally give a reply code. If an error has 1911 ** already been given, don't mail a 1912 ** message back. 1913 ** We goose error returns by clearing error bit. 1914 */ 1915 1916 SmtpPhase = "delivery"; 1917 (void) bftruncate(e->e_xfp); 1918 id = e->e_id; 1919 1920 /* 1921 ** If a header/body check (header checks or milter) 1922 ** set EF_DISCARD, don't queueup the message -- 1923 ** that would lose the EF_DISCARD bit and deliver 1924 ** the message. 1925 */ 1926 1927 if (bitset(EF_DISCARD, e->e_flags)) 1928 doublequeue = FALSE; 1929 1930 if (doublequeue) 1931 { 1932 /* make sure it is in the queue */ 1933 queueup(e, FALSE); 1934 } 1935 else 1936 { 1937 /* send to all recipients */ 1938 # if NAMED_BIND 1939 _res.retry = TimeOuts.res_retry[RES_TO_FIRST]; 1940 _res.retrans = TimeOuts.res_retrans[RES_TO_FIRST]; 1941 # endif /* NAMED_BIND */ 1942 sendall(e, SM_DEFAULT); 1943 } 1944 e->e_to = NULL; 1945 1946 /* issue success message */ 1947 message("250 2.0.0 %s Message accepted for delivery", id); 1948 1949 /* if we just queued, poke it */ 1950 if (doublequeue && 1951 e->e_sendmode != SM_QUEUE && 1952 e->e_sendmode != SM_DEFER) 1953 { 1954 CurrentLA = sm_getla(e); 1955 1956 if (!shouldqueue(e->e_msgpriority, e->e_ctime)) 1957 { 1958 /* close all the queue files */ 1959 closexscript(e); 1960 if (e->e_dfp != NULL) 1961 (void) bfclose(e->e_dfp); 1962 e->e_dfp = NULL; 1963 unlockqueue(e); 1964 1965 (void) dowork(e->e_queuedir, id, 1966 TRUE, TRUE, e); 1967 } 1968 } 1969 1970 abortmessage: 1971 if (LogLevel > 4 && bitset(EF_LOGSENDER, e->e_flags)) 1972 logsender(e, NULL); 1973 e->e_flags &= ~EF_LOGSENDER; 1974 1975 /* if in a child, pop back to our parent */ 1976 if (InChild) 1977 finis(TRUE, ExitStat); 1978 1979 /* clean up a bit */ 1980 gotmail = FALSE; 1981 dropenvelope(e, TRUE); 1982 CurEnv = e = newenvelope(e, CurEnv); 1983 e->e_flags = BlankEnvelope.e_flags; 1984 break; 1985 1986 case CMDRSET: /* rset -- reset state */ 1987 # if _FFR_MILTER 1988 /* abort milter filters */ 1989 milter_abort(e); 1990 # endif /* _FFR_MILTER */ 1991 1992 if (tTd(94, 100)) 1993 message("451 4.0.0 Test failure"); 1994 else 1995 message("250 2.0.0 Reset state"); 1996 1997 /* arrange to ignore any current send list */ 1998 e->e_sendqueue = NULL; 1999 e->e_flags |= EF_CLRQUEUE; 2000 2001 if (LogLevel > 4 && bitset(EF_LOGSENDER, e->e_flags)) 2002 logsender(e, NULL); 2003 e->e_flags &= ~EF_LOGSENDER; 2004 2005 if (InChild) 2006 finis(TRUE, ExitStat); 2007 2008 /* clean up a bit */ 2009 gotmail = FALSE; 2010 SuprErrs = TRUE; 2011 dropenvelope(e, TRUE); 2012 CurEnv = e = newenvelope(e, CurEnv); 2013 break; 2014 2015 case CMDVRFY: /* vrfy -- verify address */ 2016 case CMDEXPN: /* expn -- expand address */ 2017 if (tempfail) 2018 { 2019 if (LogLevel > 9) 2020 sm_syslog(LOG_INFO, e->e_id, 2021 "SMTP %s command (%.100s) from %.100s tempfailed (due to previous checks)", 2022 c->cmd_code == CMDVRFY ? "VRFY" : "EXPN", 2023 p, CurSmtpClient); 2024 usrerr("550 5.7.1 Please try again later"); 2025 break; 2026 } 2027 wt = checksmtpattack(&nverifies, MAXVRFYCOMMANDS, FALSE, 2028 c->cmd_code == CMDVRFY ? "VRFY" : "EXPN", e); 2029 previous = curtime(); 2030 vrfy = c->cmd_code == CMDVRFY; 2031 if (bitset(vrfy ? PRIV_NOVRFY : PRIV_NOEXPN, 2032 PrivacyFlags)) 2033 { 2034 if (vrfy) 2035 message("252 2.5.2 Cannot VRFY user; try RCPT to attempt delivery (or try finger)"); 2036 else 2037 message("502 5.7.0 Sorry, we do not allow this operation"); 2038 if (LogLevel > 5) 2039 sm_syslog(LOG_INFO, e->e_id, 2040 "%.100s: %s [rejected]", 2041 CurSmtpClient, 2042 shortenstring(inp, MAXSHORTSTR)); 2043 break; 2044 } 2045 else if (!gothello && 2046 bitset(vrfy ? PRIV_NEEDVRFYHELO : PRIV_NEEDEXPNHELO, 2047 PrivacyFlags)) 2048 { 2049 usrerr("503 5.0.0 I demand that you introduce yourself first"); 2050 break; 2051 } 2052 if (runinchild(vrfy ? "SMTP-VRFY" : "SMTP-EXPN", e) > 0) 2053 break; 2054 if (Errors > 0) 2055 goto undo_subproc; 2056 if (LogLevel > 5) 2057 sm_syslog(LOG_INFO, e->e_id, 2058 "%.100s: %s", 2059 CurSmtpClient, 2060 shortenstring(inp, MAXSHORTSTR)); 2061 if (setjmp(TopFrame) > 0) 2062 goto undo_subproc; 2063 QuickAbort = TRUE; 2064 vrfyqueue = NULL; 2065 if (vrfy) 2066 e->e_flags |= EF_VRFYONLY; 2067 while (*p != '\0' && isascii(*p) && isspace(*p)) 2068 p++; 2069 if (*p == '\0') 2070 { 2071 usrerr("501 5.5.2 Argument required"); 2072 } 2073 else 2074 { 2075 /* do config file checking of the address */ 2076 if (rscheck(vrfy ? "check_vrfy" : "check_expn", 2077 p, NULL, e, TRUE, FALSE, 4, NULL) 2078 != EX_OK || Errors > 0) 2079 goto undo_subproc; 2080 (void) sendtolist(p, NULLADDR, &vrfyqueue, 0, e); 2081 } 2082 if (wt > 0) 2083 { 2084 time_t t; 2085 2086 t = wt - (curtime() - previous); 2087 if (t > 0) 2088 (void) sleep(t); 2089 } 2090 if (Errors > 0) 2091 goto undo_subproc; 2092 if (vrfyqueue == NULL) 2093 { 2094 usrerr("554 5.5.2 Nothing to %s", vrfy ? "VRFY" : "EXPN"); 2095 } 2096 while (vrfyqueue != NULL) 2097 { 2098 if (!QS_IS_UNDELIVERED(vrfyqueue->q_state)) 2099 { 2100 vrfyqueue = vrfyqueue->q_next; 2101 continue; 2102 } 2103 2104 /* see if there is more in the vrfy list */ 2105 a = vrfyqueue; 2106 while ((a = a->q_next) != NULL && 2107 (!QS_IS_UNDELIVERED(a->q_state))) 2108 continue; 2109 printvrfyaddr(vrfyqueue, a == NULL, vrfy); 2110 vrfyqueue = a; 2111 } 2112 if (InChild) 2113 finis(TRUE, ExitStat); 2114 break; 2115 2116 case CMDETRN: /* etrn -- force queue flush */ 2117 if (bitset(PRIV_NOETRN, PrivacyFlags) || 2118 bitnset(D_NOETRN, d_flags)) 2119 { 2120 /* different message for MSA ? */ 2121 message("502 5.7.0 Sorry, we do not allow this operation"); 2122 if (LogLevel > 5) 2123 sm_syslog(LOG_INFO, e->e_id, 2124 "%.100s: %s [rejected]", 2125 CurSmtpClient, 2126 shortenstring(inp, MAXSHORTSTR)); 2127 break; 2128 } 2129 if (tempfail) 2130 { 2131 if (LogLevel > 9) 2132 sm_syslog(LOG_INFO, e->e_id, 2133 "SMTP ETRN command (%.100s) from %.100s tempfailed (due to previous checks)", 2134 p, CurSmtpClient); 2135 usrerr("451 4.7.1 Please try again later"); 2136 break; 2137 } 2138 2139 if (strlen(p) <= 0) 2140 { 2141 usrerr("500 5.5.2 Parameter required"); 2142 break; 2143 } 2144 2145 /* crude way to avoid denial-of-service attacks */ 2146 (void) checksmtpattack(&n_etrn, MAXETRNCOMMANDS, TRUE, 2147 "ETRN", e); 2148 2149 /* do config file checking of the parameter */ 2150 if (rscheck("check_etrn", p, NULL, e, TRUE, FALSE, 4, 2151 NULL) != EX_OK || Errors > 0) 2152 break; 2153 2154 if (LogLevel > 5) 2155 sm_syslog(LOG_INFO, e->e_id, 2156 "%.100s: ETRN %s", 2157 CurSmtpClient, 2158 shortenstring(p, MAXSHORTSTR)); 2159 2160 id = p; 2161 if (*id == '@') 2162 id++; 2163 else 2164 *--id = '@'; 2165 2166 if ((new = (QUEUE_CHAR *)malloc(sizeof(QUEUE_CHAR))) == NULL) 2167 { 2168 syserr("500 5.5.0 ETRN out of memory"); 2169 break; 2170 } 2171 new->queue_match = id; 2172 new->queue_next = NULL; 2173 QueueLimitRecipient = new; 2174 ok = runqueue(TRUE, FALSE); 2175 free(QueueLimitRecipient); 2176 QueueLimitRecipient = NULL; 2177 if (ok && Errors == 0) 2178 message("250 2.0.0 Queuing for node %s started", p); 2179 break; 2180 2181 case CMDHELP: /* help -- give user info */ 2182 help(p, e); 2183 break; 2184 2185 case CMDNOOP: /* noop -- do nothing */ 2186 (void) checksmtpattack(&n_noop, MAXNOOPCOMMANDS, TRUE, 2187 "NOOP", e); 2188 message("250 2.0.0 OK"); 2189 break; 2190 2191 case CMDQUIT: /* quit -- leave mail */ 2192 message("221 2.0.0 %s closing connection", MyHostName); 2193 2194 /* arrange to ignore any current send list */ 2195 e->e_sendqueue = NULL; 2196 2197 # if STARTTLS 2198 /* shutdown TLS connection */ 2199 if (tls_active) 2200 { 2201 (void) endtls(srv_ssl, "server"); 2202 tls_active = FALSE; 2203 } 2204 # endif /* STARTTLS */ 2205 # if SASL 2206 if (authenticating == SASL_IS_AUTH) 2207 { 2208 sasl_dispose(&conn); 2209 authenticating = SASL_NOT_AUTH; 2210 } 2211 # endif /* SASL */ 2212 2213 doquit: 2214 /* avoid future 050 messages */ 2215 disconnect(1, e); 2216 2217 # if _FFR_MILTER 2218 /* close out milter filters */ 2219 milter_quit(e); 2220 # endif /* _FFR_MILTER */ 2221 2222 if (InChild) 2223 ExitStat = EX_QUIT; 2224 2225 if (LogLevel > 4 && bitset(EF_LOGSENDER, e->e_flags)) 2226 logsender(e, NULL); 2227 e->e_flags &= ~EF_LOGSENDER; 2228 2229 if (lognullconnection && LogLevel > 5) 2230 { 2231 char *d; 2232 2233 d = macvalue(macid("{daemon_name}", NULL), e); 2234 if (d == NULL) 2235 d = "stdin"; 2236 sm_syslog(LOG_INFO, NULL, 2237 "%.100s did not issue MAIL/EXPN/VRFY/ETRN during connection to %s", 2238 CurSmtpClient, d); 2239 } 2240 finis(TRUE, ExitStat); 2241 /* NOTREACHED */ 2242 2243 case CMDVERB: /* set verbose mode */ 2244 if (bitset(PRIV_NOEXPN, PrivacyFlags) || 2245 bitset(PRIV_NOVERB, PrivacyFlags)) 2246 { 2247 /* this would give out the same info */ 2248 message("502 5.7.0 Verbose unavailable"); 2249 break; 2250 } 2251 (void) checksmtpattack(&n_noop, MAXNOOPCOMMANDS, TRUE, 2252 "VERB", e); 2253 Verbose = 1; 2254 set_delivery_mode(SM_DELIVER, e); 2255 message("250 2.0.0 Verbose mode"); 2256 break; 2257 2258 case CMDONEX: /* doing one transaction only */ 2259 (void) checksmtpattack(&n_noop, MAXNOOPCOMMANDS, TRUE, 2260 "ONEX", e); 2261 OneXact = TRUE; 2262 message("250 2.0.0 Only one transaction"); 2263 break; 2264 2265 case CMDXUSR: /* initial (user) submission */ 2266 (void) checksmtpattack(&n_noop, MAXNOOPCOMMANDS, TRUE, 2267 "XUSR", e); 2268 define(macid("{daemon_flags}", NULL), "c u", CurEnv); 2269 message("250 2.0.0 Initial submission"); 2270 break; 2271 2272 # if SMTPDEBUG 2273 case CMDDBGQSHOW: /* show queues */ 2274 printf("Send Queue="); 2275 printaddr(e->e_sendqueue, TRUE); 2276 break; 2277 2278 case CMDDBGDEBUG: /* set debug mode */ 2279 tTsetup(tTdvect, sizeof tTdvect, "0-99.1"); 2280 tTflag(p); 2281 message("200 2.0.0 Debug set"); 2282 break; 2283 2284 # else /* SMTPDEBUG */ 2285 case CMDDBGQSHOW: /* show queues */ 2286 case CMDDBGDEBUG: /* set debug mode */ 2287 # endif /* SMTPDEBUG */ 2288 case CMDLOGBOGUS: /* bogus command */ 2289 if (LogLevel > 0) 2290 sm_syslog(LOG_CRIT, e->e_id, 2291 "\"%s\" command from %.100s (%.100s)", 2292 c->cmd_name, CurSmtpClient, 2293 anynet_ntoa(&RealHostAddr)); 2294 /* FALLTHROUGH */ 2295 2296 case CMDERROR: /* unknown command */ 2297 if (++badcommands > MAXBADCOMMANDS) 2298 { 2299 message("421 4.7.0 %s Too many bad commands; closing connection", 2300 MyHostName); 2301 2302 /* arrange to ignore any current send list */ 2303 e->e_sendqueue = NULL; 2304 goto doquit; 2305 } 2306 2307 usrerr("500 5.5.1 Command unrecognized: \"%s\"", 2308 shortenstring(inp, MAXSHORTSTR)); 2309 break; 2310 2311 case CMDUNIMPL: 2312 usrerr("502 5.5.1 Command not implemented: \"%s\"", 2313 shortenstring(inp, MAXSHORTSTR)); 2314 break; 2315 2316 default: 2317 errno = 0; 2318 syserr("500 5.5.0 smtp: unknown code %d", c->cmd_code); 2319 break; 2320 } 2321 # if SASL 2322 } 2323 # endif /* SASL */ 2324 } 2325 2326 } 2327 /* 2328 ** CHECKSMTPATTACK -- check for denial-of-service attack by repetition 2329 ** 2330 ** Parameters: 2331 ** pcounter -- pointer to a counter for this command. 2332 ** maxcount -- maximum value for this counter before we 2333 ** slow down. 2334 ** waitnow -- sleep now (in this routine)? 2335 ** cname -- command name for logging. 2336 ** e -- the current envelope. 2337 ** 2338 ** Returns: 2339 ** time to wait. 2340 ** 2341 ** Side Effects: 2342 ** Slows down if we seem to be under attack. 2343 */ 2344 2345 static time_t 2346 checksmtpattack(pcounter, maxcount, waitnow, cname, e) 2347 volatile int *pcounter; 2348 int maxcount; 2349 bool waitnow; 2350 char *cname; 2351 ENVELOPE *e; 2352 { 2353 if (++(*pcounter) >= maxcount) 2354 { 2355 time_t s; 2356 2357 if (*pcounter == maxcount && LogLevel > 5) 2358 { 2359 sm_syslog(LOG_INFO, e->e_id, 2360 "%.100s: %.40s attack?", 2361 CurSmtpClient, cname); 2362 } 2363 s = 1 << (*pcounter - maxcount); 2364 if (s >= MAXTIMEOUT) 2365 s = MAXTIMEOUT; 2366 /* sleep at least 1 second before returning */ 2367 (void) sleep(*pcounter / maxcount); 2368 s -= *pcounter / maxcount; 2369 if (waitnow) 2370 { 2371 (void) sleep(s); 2372 return(0); 2373 } 2374 return(s); 2375 } 2376 return((time_t) 0); 2377 } 2378 /* 2379 ** SKIPWORD -- skip a fixed word. 2380 ** 2381 ** Parameters: 2382 ** p -- place to start looking. 2383 ** w -- word to skip. 2384 ** 2385 ** Returns: 2386 ** p following w. 2387 ** NULL on error. 2388 ** 2389 ** Side Effects: 2390 ** clobbers the p data area. 2391 */ 2392 2393 static char * 2394 skipword(p, w) 2395 register char *volatile p; 2396 char *w; 2397 { 2398 register char *q; 2399 char *firstp = p; 2400 2401 /* find beginning of word */ 2402 while (isascii(*p) && isspace(*p)) 2403 p++; 2404 q = p; 2405 2406 /* find end of word */ 2407 while (*p != '\0' && *p != ':' && !(isascii(*p) && isspace(*p))) 2408 p++; 2409 while (isascii(*p) && isspace(*p)) 2410 *p++ = '\0'; 2411 if (*p != ':') 2412 { 2413 syntax: 2414 usrerr("501 5.5.2 Syntax error in parameters scanning \"%s\"", 2415 shortenstring(firstp, MAXSHORTSTR)); 2416 return NULL; 2417 } 2418 *p++ = '\0'; 2419 while (isascii(*p) && isspace(*p)) 2420 p++; 2421 2422 if (*p == '\0') 2423 goto syntax; 2424 2425 /* see if the input word matches desired word */ 2426 if (strcasecmp(q, w)) 2427 goto syntax; 2428 2429 return p; 2430 } 2431 /* 2432 ** MAIL_ESMTP_ARGS -- process ESMTP arguments from MAIL line 2433 ** 2434 ** Parameters: 2435 ** kp -- the parameter key. 2436 ** vp -- the value of that parameter. 2437 ** e -- the envelope. 2438 ** 2439 ** Returns: 2440 ** none. 2441 */ 2442 2443 static void 2444 mail_esmtp_args(kp, vp, e) 2445 char *kp; 2446 char *vp; 2447 ENVELOPE *e; 2448 { 2449 if (strcasecmp(kp, "size") == 0) 2450 { 2451 if (vp == NULL) 2452 { 2453 usrerr("501 5.5.2 SIZE requires a value"); 2454 /* NOTREACHED */ 2455 } 2456 define(macid("{msg_size}", NULL), newstr(vp), e); 2457 e->e_msgsize = strtol(vp, (char **) NULL, 10); 2458 if (e->e_msgsize == LONG_MAX && errno == ERANGE) 2459 { 2460 usrerr("552 5.2.3 Message size exceeds maximum value"); 2461 /* NOTREACHED */ 2462 } 2463 } 2464 else if (strcasecmp(kp, "body") == 0) 2465 { 2466 if (vp == NULL) 2467 { 2468 usrerr("501 5.5.2 BODY requires a value"); 2469 /* NOTREACHED */ 2470 } 2471 else if (strcasecmp(vp, "8bitmime") == 0) 2472 { 2473 SevenBitInput = FALSE; 2474 } 2475 else if (strcasecmp(vp, "7bit") == 0) 2476 { 2477 SevenBitInput = TRUE; 2478 } 2479 else 2480 { 2481 usrerr("501 5.5.4 Unknown BODY type %s", 2482 vp); 2483 /* NOTREACHED */ 2484 } 2485 e->e_bodytype = newstr(vp); 2486 } 2487 else if (strcasecmp(kp, "envid") == 0) 2488 { 2489 if (bitset(PRIV_NORECEIPTS, PrivacyFlags)) 2490 { 2491 usrerr("504 5.7.0 Sorry, ENVID not supported, we do not allow DSN"); 2492 /* NOTREACHED */ 2493 } 2494 if (vp == NULL) 2495 { 2496 usrerr("501 5.5.2 ENVID requires a value"); 2497 /* NOTREACHED */ 2498 } 2499 if (!xtextok(vp)) 2500 { 2501 usrerr("501 5.5.4 Syntax error in ENVID parameter value"); 2502 /* NOTREACHED */ 2503 } 2504 if (e->e_envid != NULL) 2505 { 2506 usrerr("501 5.5.0 Duplicate ENVID parameter"); 2507 /* NOTREACHED */ 2508 } 2509 e->e_envid = newstr(vp); 2510 define(macid("{dsn_envid}", NULL), newstr(vp), e); 2511 } 2512 else if (strcasecmp(kp, "ret") == 0) 2513 { 2514 if (bitset(PRIV_NORECEIPTS, PrivacyFlags)) 2515 { 2516 usrerr("504 5.7.0 Sorry, RET not supported, we do not allow DSN"); 2517 /* NOTREACHED */ 2518 } 2519 if (vp == NULL) 2520 { 2521 usrerr("501 5.5.2 RET requires a value"); 2522 /* NOTREACHED */ 2523 } 2524 if (bitset(EF_RET_PARAM, e->e_flags)) 2525 { 2526 usrerr("501 5.5.0 Duplicate RET parameter"); 2527 /* NOTREACHED */ 2528 } 2529 e->e_flags |= EF_RET_PARAM; 2530 if (strcasecmp(vp, "hdrs") == 0) 2531 e->e_flags |= EF_NO_BODY_RETN; 2532 else if (strcasecmp(vp, "full") != 0) 2533 { 2534 usrerr("501 5.5.2 Bad argument \"%s\" to RET", vp); 2535 /* NOTREACHED */ 2536 } 2537 define(macid("{dsn_ret}", NULL), newstr(vp), e); 2538 } 2539 # if SASL 2540 else if (strcasecmp(kp, "auth") == 0) 2541 { 2542 int len; 2543 char *q; 2544 char *auth_param; /* the value of the AUTH=x */ 2545 bool saveQuickAbort = QuickAbort; 2546 bool saveSuprErrs = SuprErrs; 2547 char pbuf[256]; 2548 2549 if (vp == NULL) 2550 { 2551 usrerr("501 5.5.2 AUTH= requires a value"); 2552 /* NOTREACHED */ 2553 } 2554 if (e->e_auth_param != NULL) 2555 { 2556 usrerr("501 5.5.0 Duplicate AUTH parameter"); 2557 /* NOTREACHED */ 2558 } 2559 if ((q = strchr(vp, ' ')) != NULL) 2560 len = q - vp + 1; 2561 else 2562 len = strlen(vp) + 1; 2563 auth_param = xalloc(len); 2564 (void) strlcpy(auth_param, vp, len); 2565 if (!xtextok(auth_param)) 2566 { 2567 usrerr("501 5.5.4 Syntax error in AUTH parameter value"); 2568 /* just a warning? */ 2569 /* NOTREACHED */ 2570 } 2571 2572 /* XXX this might be cut off */ 2573 snprintf(pbuf, sizeof pbuf, "%s", xuntextify(auth_param)); 2574 /* xalloc() the buffer instead? */ 2575 2576 /* XXX define this always or only if trusted? */ 2577 define(macid("{auth_author}", NULL), newstr(pbuf), e); 2578 2579 /* 2580 ** call Strust_auth to find out whether 2581 ** auth_param is acceptable (trusted) 2582 ** we shouldn't trust it if not authenticated 2583 ** (required by RFC, leave it to ruleset?) 2584 */ 2585 2586 SuprErrs = TRUE; 2587 QuickAbort = FALSE; 2588 if (strcmp(auth_param, "<>") != 0 && 2589 (rscheck("trust_auth", pbuf, NULL, e, TRUE, FALSE, 10, 2590 NULL) != EX_OK || Errors > 0)) 2591 { 2592 if (tTd(95, 8)) 2593 { 2594 q = e->e_auth_param; 2595 dprintf("auth=\"%.100s\" not trusted user=\"%.100s\"\n", 2596 pbuf, (q == NULL) ? "" : q); 2597 } 2598 /* not trusted */ 2599 e->e_auth_param = newstr("<>"); 2600 } 2601 else 2602 { 2603 if (tTd(95, 8)) 2604 dprintf("auth=\"%.100s\" trusted\n", pbuf); 2605 e->e_auth_param = newstr(auth_param); 2606 } 2607 free(auth_param); 2608 /* reset values */ 2609 Errors = 0; 2610 QuickAbort = saveQuickAbort; 2611 SuprErrs = saveSuprErrs; 2612 } 2613 # endif /* SASL */ 2614 else 2615 { 2616 usrerr("555 5.5.4 %s parameter unrecognized", kp); 2617 /* NOTREACHED */ 2618 } 2619 } 2620 /* 2621 ** RCPT_ESMTP_ARGS -- process ESMTP arguments from RCPT line 2622 ** 2623 ** Parameters: 2624 ** a -- the address corresponding to the To: parameter. 2625 ** kp -- the parameter key. 2626 ** vp -- the value of that parameter. 2627 ** e -- the envelope. 2628 ** 2629 ** Returns: 2630 ** none. 2631 */ 2632 2633 static void 2634 rcpt_esmtp_args(a, kp, vp, e) 2635 ADDRESS *a; 2636 char *kp; 2637 char *vp; 2638 ENVELOPE *e; 2639 { 2640 if (strcasecmp(kp, "notify") == 0) 2641 { 2642 char *p; 2643 2644 if (bitset(PRIV_NORECEIPTS, PrivacyFlags)) 2645 { 2646 usrerr("504 5.7.0 Sorry, NOTIFY not supported, we do not allow DSN"); 2647 /* NOTREACHED */ 2648 } 2649 if (vp == NULL) 2650 { 2651 usrerr("501 5.5.2 NOTIFY requires a value"); 2652 /* NOTREACHED */ 2653 } 2654 a->q_flags &= ~(QPINGONSUCCESS|QPINGONFAILURE|QPINGONDELAY); 2655 a->q_flags |= QHASNOTIFY; 2656 define(macid("{dsn_notify}", NULL), newstr(vp), e); 2657 2658 if (strcasecmp(vp, "never") == 0) 2659 return; 2660 for (p = vp; p != NULL; vp = p) 2661 { 2662 p = strchr(p, ','); 2663 if (p != NULL) 2664 *p++ = '\0'; 2665 if (strcasecmp(vp, "success") == 0) 2666 a->q_flags |= QPINGONSUCCESS; 2667 else if (strcasecmp(vp, "failure") == 0) 2668 a->q_flags |= QPINGONFAILURE; 2669 else if (strcasecmp(vp, "delay") == 0) 2670 a->q_flags |= QPINGONDELAY; 2671 else 2672 { 2673 usrerr("501 5.5.4 Bad argument \"%s\" to NOTIFY", 2674 vp); 2675 /* NOTREACHED */ 2676 } 2677 } 2678 } 2679 else if (strcasecmp(kp, "orcpt") == 0) 2680 { 2681 if (bitset(PRIV_NORECEIPTS, PrivacyFlags)) 2682 { 2683 usrerr("504 5.7.0 Sorry, ORCPT not supported, we do not allow DSN"); 2684 /* NOTREACHED */ 2685 } 2686 if (vp == NULL) 2687 { 2688 usrerr("501 5.5.2 ORCPT requires a value"); 2689 /* NOTREACHED */ 2690 } 2691 if (strchr(vp, ';') == NULL || !xtextok(vp)) 2692 { 2693 usrerr("501 5.5.4 Syntax error in ORCPT parameter value"); 2694 /* NOTREACHED */ 2695 } 2696 if (a->q_orcpt != NULL) 2697 { 2698 usrerr("501 5.5.0 Duplicate ORCPT parameter"); 2699 /* NOTREACHED */ 2700 } 2701 a->q_orcpt = newstr(vp); 2702 } 2703 else 2704 { 2705 usrerr("555 5.5.4 %s parameter unrecognized", kp); 2706 /* NOTREACHED */ 2707 } 2708 } 2709 /* 2710 ** PRINTVRFYADDR -- print an entry in the verify queue 2711 ** 2712 ** Parameters: 2713 ** a -- the address to print 2714 ** last -- set if this is the last one. 2715 ** vrfy -- set if this is a VRFY command. 2716 ** 2717 ** Returns: 2718 ** none. 2719 ** 2720 ** Side Effects: 2721 ** Prints the appropriate 250 codes. 2722 */ 2723 #define OFFF (3 + 1 + 5 + 1) /* offset in fmt: SMTP reply + enh. code */ 2724 2725 static void 2726 printvrfyaddr(a, last, vrfy) 2727 register ADDRESS *a; 2728 bool last; 2729 bool vrfy; 2730 { 2731 char fmtbuf[30]; 2732 2733 if (vrfy && a->q_mailer != NULL && 2734 !bitnset(M_VRFY250, a->q_mailer->m_flags)) 2735 (void) strlcpy(fmtbuf, "252", sizeof fmtbuf); 2736 else 2737 (void) strlcpy(fmtbuf, "250", sizeof fmtbuf); 2738 fmtbuf[3] = last ? ' ' : '-'; 2739 (void) strlcpy(&fmtbuf[4], "2.1.5 ", sizeof fmtbuf - 4); 2740 if (a->q_fullname == NULL) 2741 { 2742 if ((a->q_mailer == NULL || 2743 a->q_mailer->m_addrtype == NULL || 2744 strcasecmp(a->q_mailer->m_addrtype, "rfc822") == 0) && 2745 strchr(a->q_user, '@') == NULL) 2746 (void) strlcpy(&fmtbuf[OFFF], "<%s@%s>", 2747 sizeof fmtbuf - OFFF); 2748 else 2749 (void) strlcpy(&fmtbuf[OFFF], "<%s>", 2750 sizeof fmtbuf - OFFF); 2751 message(fmtbuf, a->q_user, MyHostName); 2752 } 2753 else 2754 { 2755 if ((a->q_mailer == NULL || 2756 a->q_mailer->m_addrtype == NULL || 2757 strcasecmp(a->q_mailer->m_addrtype, "rfc822") == 0) && 2758 strchr(a->q_user, '@') == NULL) 2759 (void) strlcpy(&fmtbuf[OFFF], "%s <%s@%s>", 2760 sizeof fmtbuf - OFFF); 2761 else 2762 (void) strlcpy(&fmtbuf[OFFF], "%s <%s>", 2763 sizeof fmtbuf - OFFF); 2764 message(fmtbuf, a->q_fullname, a->q_user, MyHostName); 2765 } 2766 } 2767 /* 2768 ** RUNINCHILD -- return twice -- once in the child, then in the parent again 2769 ** 2770 ** Parameters: 2771 ** label -- a string used in error messages 2772 ** 2773 ** Returns: 2774 ** RIC_INCHILD in the child 2775 ** RIC_INPARENT in the parent 2776 ** RIC_TEMPFAIL tempfail condition 2777 ** 2778 ** Side Effects: 2779 ** none. 2780 */ 2781 2782 static int 2783 runinchild(label, e) 2784 char *label; 2785 register ENVELOPE *e; 2786 { 2787 pid_t childpid; 2788 2789 if (!OneXact) 2790 { 2791 extern int NumQueues; 2792 2793 /* 2794 ** advance state of PRNG 2795 ** this is necessary because otherwise all child processes 2796 ** will produce the same PRN sequence and hence the selection 2797 ** of a queue directory is not "really" random. 2798 */ 2799 if (NumQueues > 1) 2800 (void) get_random(); 2801 2802 /* 2803 ** Disable child process reaping, in case ETRN has preceded 2804 ** MAIL command, and then fork. 2805 */ 2806 2807 (void) blocksignal(SIGCHLD); 2808 2809 2810 childpid = dofork(); 2811 if (childpid < 0) 2812 { 2813 syserr("451 4.3.0 %s: cannot fork", label); 2814 (void) releasesignal(SIGCHLD); 2815 return RIC_INPARENT; 2816 } 2817 if (childpid > 0) 2818 { 2819 auto int st; 2820 2821 /* parent -- wait for child to complete */ 2822 sm_setproctitle(TRUE, e, "server %s child wait", 2823 CurSmtpClient); 2824 st = waitfor(childpid); 2825 if (st == -1) 2826 syserr("451 4.3.0 %s: lost child", label); 2827 else if (!WIFEXITED(st)) 2828 { 2829 syserr("451 4.3.0 %s: died on signal %d", 2830 label, st & 0177); 2831 return RIC_TEMPFAIL; 2832 } 2833 2834 /* if exited on a QUIT command, complete the process */ 2835 if (WEXITSTATUS(st) == EX_QUIT) 2836 { 2837 disconnect(1, e); 2838 finis(TRUE, ExitStat); 2839 } 2840 2841 /* restore the child signal */ 2842 (void) releasesignal(SIGCHLD); 2843 2844 return RIC_INPARENT; 2845 } 2846 else 2847 { 2848 /* child */ 2849 InChild = TRUE; 2850 QuickAbort = FALSE; 2851 clearstats(); 2852 clearenvelope(e, FALSE); 2853 assign_queueid(e); 2854 (void) setsignal(SIGCHLD, SIG_DFL); 2855 (void) releasesignal(SIGCHLD); 2856 } 2857 } 2858 return RIC_INCHILD; 2859 } 2860 2861 # if SASL 2862 2863 /* 2864 ** SASLMECHS -- get list of possible AUTH mechanisms 2865 ** 2866 ** Parameters: 2867 ** conn -- SASL connection info 2868 ** mechlist -- output parameter for list of mechanisms 2869 ** 2870 ** Returns: 2871 ** number of mechs 2872 */ 2873 2874 static int 2875 saslmechs(conn, mechlist) 2876 sasl_conn_t *conn; 2877 char **mechlist; 2878 { 2879 int len, num, result; 2880 2881 /* "user" is currently unused */ 2882 result = sasl_listmech(conn, "user", /* XXX */ 2883 "", " ", "", mechlist, 2884 (u_int *)&len, (u_int *)&num); 2885 if (result == SASL_OK && num > 0) 2886 { 2887 if (LogLevel > 11) 2888 sm_syslog(LOG_INFO, NOQID, 2889 "SASL: available mech=%s, allowed mech=%s", 2890 *mechlist, AuthMechanisms); 2891 *mechlist = intersect(AuthMechanisms, *mechlist); 2892 } 2893 else 2894 { 2895 if (LogLevel > 9) 2896 sm_syslog(LOG_WARNING, NOQID, 2897 "SASL error: listmech=%d, num=%d", 2898 result, num); 2899 num = 0; 2900 } 2901 return num; 2902 } 2903 2904 /* 2905 ** PROXY_POLICY -- define proxy policy for AUTH 2906 ** 2907 ** Parameters: 2908 ** conntext -- unused 2909 ** auth_identity -- authentication identity 2910 ** requested_user -- authorization identity 2911 ** user -- allowed user (output) 2912 ** errstr -- possible error string (output) 2913 ** 2914 ** Returns: 2915 ** ok? 2916 */ 2917 2918 int 2919 proxy_policy(context, auth_identity, requested_user, user, errstr) 2920 void *context; 2921 const char *auth_identity; 2922 const char *requested_user; 2923 const char **user; 2924 const char **errstr; 2925 { 2926 if (user == NULL || auth_identity == NULL) 2927 return SASL_FAIL; 2928 *user = newstr(auth_identity); 2929 return SASL_OK; 2930 } 2931 2932 # endif /* SASL */ 2933 2934 # if STARTTLS 2935 # if !TLS_NO_RSA 2936 RSA *rsa_tmp; /* temporary RSA key */ 2937 static RSA * tmp_rsa_key __P((SSL *, int, int)); 2938 # endif /* !TLS_NO_RSA */ 2939 2940 # if !NO_DH 2941 static DH *get_dh512 __P((void)); 2942 2943 static unsigned char dh512_p[] = 2944 { 2945 0xDA,0x58,0x3C,0x16,0xD9,0x85,0x22,0x89,0xD0,0xE4,0xAF,0x75, 2946 0x6F,0x4C,0xCA,0x92,0xDD,0x4B,0xE5,0x33,0xB8,0x04,0xFB,0x0F, 2947 0xED,0x94,0xEF,0x9C,0x8A,0x44,0x03,0xED,0x57,0x46,0x50,0xD3, 2948 0x69,0x99,0xDB,0x29,0xD7,0x76,0x27,0x6B,0xA2,0xD3,0xD4,0x12, 2949 0xE2,0x18,0xF4,0xDD,0x1E,0x08,0x4C,0xF6,0xD8,0x00,0x3E,0x7C, 2950 0x47,0x74,0xE8,0x33 2951 }; 2952 static unsigned char dh512_g[] = 2953 { 2954 0x02 2955 }; 2956 2957 static DH * 2958 get_dh512() 2959 { 2960 DH *dh = NULL; 2961 2962 if ((dh = DH_new()) == NULL) 2963 return(NULL); 2964 dh->p = BN_bin2bn(dh512_p, sizeof(dh512_p), NULL); 2965 dh->g = BN_bin2bn(dh512_g, sizeof(dh512_g), NULL); 2966 if ((dh->p == NULL) || (dh->g == NULL)) 2967 return(NULL); 2968 return(dh); 2969 } 2970 # endif /* !NO_DH */ 2971 2972 /* 2973 ** TLS_RAND_INIT -- initialize STARTTLS random generator 2974 ** 2975 ** Parameters: 2976 ** randfile -- name of file with random data 2977 ** logl -- loglevel 2978 ** 2979 ** Returns: 2980 ** success/failure 2981 ** 2982 ** Side Effects: 2983 ** initializes PRNG for tls library. 2984 */ 2985 2986 #define MIN_RAND_BYTES 16 /* 128 bits */ 2987 2988 bool 2989 tls_rand_init(randfile, logl) 2990 char *randfile; 2991 int logl; 2992 { 2993 # ifndef HASURANDOMDEV 2994 /* not required if /dev/urandom exists, OpenSSL does it internally */ 2995 2996 #define RF_OK 0 /* randfile OK */ 2997 #define RF_MISS 1 /* randfile == NULL || *randfile == '\0' */ 2998 #define RF_UNKNOWN 2 /* unknown prefix for randfile */ 2999 3000 #define RI_NONE 0 /* no init yet */ 3001 #define RI_SUCCESS 1 /* init was successful */ 3002 #define RI_FAIL 2 /* init failed */ 3003 3004 bool ok; 3005 int randdef; 3006 static int done = RI_NONE; 3007 3008 /* 3009 ** initialize PRNG 3010 */ 3011 3012 /* did we try this before? if yes: return old value */ 3013 if (done != RI_NONE) 3014 return done == RI_SUCCESS; 3015 3016 /* set default values */ 3017 ok = FALSE; 3018 done = RI_FAIL; 3019 randdef = (randfile == NULL || *randfile == '\0') ? RF_MISS : RF_OK; 3020 # if EGD 3021 if (randdef == RF_OK && strncasecmp(randfile, "egd:", 4) == 0) 3022 { 3023 randfile += 4; 3024 if (RAND_egd(randfile) < 0) 3025 { 3026 sm_syslog(LOG_WARNING, NOQID, 3027 "TLS: RAND_egd(%s) failed: random number generator not seeded", 3028 randfile); 3029 } 3030 else 3031 ok = TRUE; 3032 } 3033 else 3034 # endif /* EGD */ 3035 if (randdef == RF_OK && strncasecmp(randfile, "file:", 5) == 0) 3036 { 3037 int fd; 3038 long sff; 3039 struct stat st; 3040 3041 randfile += 5; 3042 sff = SFF_SAFEDIRPATH | SFF_NOWLINK 3043 | SFF_NOGWFILES | SFF_NOWWFILES 3044 | SFF_NOGRFILES | SFF_NOWRFILES 3045 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 3046 if ((fd = safeopen(randfile, O_RDONLY, 0, sff)) >= 0) 3047 { 3048 if (fstat(fd, &st) < 0) 3049 { 3050 if (LogLevel > logl) 3051 sm_syslog(LOG_ERR, NOQID, 3052 "TLS: can't fstat(%s)", 3053 randfile); 3054 } 3055 else 3056 { 3057 bool use, problem; 3058 3059 use = TRUE; 3060 problem = FALSE; 3061 if (st.st_mtime + 600 < curtime()) 3062 { 3063 use = bitnset(DBS_INSUFFICIENTENTROPY, 3064 DontBlameSendmail); 3065 problem = TRUE; 3066 if (LogLevel > logl) 3067 sm_syslog(LOG_ERR, NOQID, 3068 "TLS: RandFile %s too old: %s", 3069 randfile, 3070 use ? "unsafe" : 3071 "unusable"); 3072 } 3073 if (use && st.st_size < MIN_RAND_BYTES) 3074 { 3075 use = bitnset(DBS_INSUFFICIENTENTROPY, 3076 DontBlameSendmail); 3077 problem = TRUE; 3078 if (LogLevel > logl) 3079 sm_syslog(LOG_ERR, NOQID, 3080 "TLS: size(%s) < %d: %s", 3081 randfile, 3082 MIN_RAND_BYTES, 3083 use ? "unsafe" : 3084 "unusable"); 3085 } 3086 if (use) 3087 ok = RAND_load_file(randfile, -1) >= 3088 MIN_RAND_BYTES; 3089 if (use && !ok) 3090 { 3091 if (LogLevel > logl) 3092 sm_syslog(LOG_WARNING, 3093 NOQID, 3094 "TLS: RAND_load_file(%s) failed: random number generator not seeded", 3095 randfile); 3096 } 3097 if (problem) 3098 ok = FALSE; 3099 } 3100 if (ok || bitnset(DBS_INSUFFICIENTENTROPY, 3101 DontBlameSendmail)) 3102 { 3103 /* add this even if fstat() failed */ 3104 RAND_seed((void *) &st, sizeof st); 3105 } 3106 (void) close(fd); 3107 } 3108 else 3109 { 3110 if (LogLevel > logl) 3111 sm_syslog(LOG_WARNING, NOQID, 3112 "TLS: Warning: safeopen(%s) failed", 3113 randfile); 3114 } 3115 } 3116 else if (randdef == RF_OK) 3117 { 3118 if (LogLevel > logl) 3119 sm_syslog(LOG_WARNING, NOQID, 3120 "TLS: Error: no proper random file definition %s", 3121 randfile); 3122 randdef = RF_UNKNOWN; 3123 } 3124 if (randdef == RF_MISS) 3125 { 3126 if (LogLevel > logl) 3127 sm_syslog(LOG_WARNING, NOQID, 3128 "TLS: Error: missing random file definition"); 3129 } 3130 if (!ok && bitnset(DBS_INSUFFICIENTENTROPY, DontBlameSendmail)) 3131 { 3132 int i; 3133 long r; 3134 unsigned char buf[MIN_RAND_BYTES]; 3135 3136 /* assert((MIN_RAND_BYTES % sizeof(long)) == 0); */ 3137 for (i = 0; i <= sizeof(buf) - sizeof(long); i += sizeof(long)) 3138 { 3139 r = get_random(); 3140 (void) memcpy(buf + i, (void *) &r, sizeof(long)); 3141 } 3142 RAND_seed(buf, sizeof buf); 3143 if (LogLevel > logl) 3144 sm_syslog(LOG_WARNING, NOQID, 3145 "TLS: Warning: random number generator not properly seeded"); 3146 ok = TRUE; 3147 } 3148 done = ok ? RI_SUCCESS : RI_FAIL; 3149 return ok; 3150 # else /* !HASURANDOMDEV */ 3151 return TRUE; 3152 # endif /* !HASURANDOMDEV */ 3153 } 3154 3155 /* 3156 ** status in initialization 3157 ** these flags keep track of the status of the initialization 3158 ** i.e., whether a file exists (_EX) and whether it can be used (_OK) 3159 ** [due to permissions] 3160 */ 3161 #define TLS_S_NONE 0x00000000 /* none yet */ 3162 #define TLS_S_CERT_EX 0x00000001 /* CERT file exists */ 3163 #define TLS_S_CERT_OK 0x00000002 /* CERT file is ok */ 3164 #define TLS_S_KEY_EX 0x00000004 /* KEY file exists */ 3165 #define TLS_S_KEY_OK 0x00000008 /* KEY file is ok */ 3166 #define TLS_S_CERTP_EX 0x00000010 /* CA CERT PATH exists */ 3167 #define TLS_S_CERTP_OK 0x00000020 /* CA CERT PATH is ok */ 3168 #define TLS_S_CERTF_EX 0x00000040 /* CA CERT FILE exists */ 3169 #define TLS_S_CERTF_OK 0x00000080 /* CA CERT FILE is ok */ 3170 3171 # if _FFR_TLS_1 3172 #define TLS_S_CERT2_EX 0x00001000 /* 2nd CERT file exists */ 3173 #define TLS_S_CERT2_OK 0x00002000 /* 2nd CERT file is ok */ 3174 #define TLS_S_KEY2_EX 0x00004000 /* 2nd KEY file exists */ 3175 #define TLS_S_KEY2_OK 0x00008000 /* 2nd KEY file is ok */ 3176 # endif /* _FFR_TLS_1 */ 3177 3178 #define TLS_S_DH_OK 0x00200000 /* DH cert is ok */ 3179 #define TLS_S_DHPAR_EX 0x00400000 /* DH param file exists */ 3180 #define TLS_S_DHPAR_OK 0x00800000 /* DH param file is ok to use */ 3181 3182 /* 3183 ** TLS_OK_F -- can var be an absolute filename? 3184 ** 3185 ** Parameters: 3186 ** var -- filename 3187 ** fn -- what is the filename used for? 3188 ** 3189 ** Returns: 3190 ** ok? 3191 */ 3192 3193 static bool 3194 tls_ok_f(var, fn) 3195 char *var; 3196 char *fn; 3197 { 3198 /* must be absolute pathname */ 3199 if (var != NULL && *var == '/') 3200 return TRUE; 3201 if (LogLevel > 12) 3202 sm_syslog(LOG_WARNING, NOQID, "TLS: file %s missing", fn); 3203 return FALSE; 3204 } 3205 3206 /* 3207 ** TLS_SAFE_F -- is a file safe to use? 3208 ** 3209 ** Parameters: 3210 ** var -- filename 3211 ** sff -- flags for safefile() 3212 ** 3213 ** Returns: 3214 ** ok? 3215 */ 3216 3217 static bool 3218 tls_safe_f(var, sff) 3219 char *var; 3220 long sff; 3221 { 3222 int ret; 3223 3224 if ((ret = safefile(var, RunAsUid, RunAsGid, RunAsUserName, sff, 3225 S_IRUSR, NULL)) == 0) 3226 return TRUE; 3227 if (LogLevel > 7) 3228 sm_syslog(LOG_WARNING, NOQID, "TLS: file %s unsafe: %s", 3229 var, errstring(ret)); 3230 return FALSE; 3231 } 3232 3233 /* 3234 ** TLS_OK_F -- macro to simplify calls to tls_ok_f 3235 ** 3236 ** Parameters: 3237 ** var -- filename 3238 ** fn -- what is the filename used for? 3239 ** req -- is the file required? 3240 ** st -- status bit to set if ok 3241 ** 3242 ** Side Effects: 3243 ** uses r, ok; may change ok and status. 3244 ** 3245 */ 3246 3247 #define TLS_OK_F(var, fn, req, st) if (ok) \ 3248 { \ 3249 r = tls_ok_f(var, fn); \ 3250 if (r) \ 3251 status |= st; \ 3252 else if (req) \ 3253 ok = FALSE; \ 3254 } 3255 3256 /* 3257 ** TLS_UNR -- macro to return whether a file should be unreadable 3258 ** 3259 ** Parameters: 3260 ** bit -- flag to test 3261 ** req -- flags 3262 ** 3263 ** Returns: 3264 ** 0/SFF_NORFILES 3265 */ 3266 #define TLS_UNR(bit, req) (bitset(bit, req) ? SFF_NORFILES : 0) 3267 3268 /* 3269 ** TLS_SAFE_F -- macro to simplify calls to tls_safe_f 3270 ** 3271 ** Parameters: 3272 ** var -- filename 3273 ** sff -- flags for safefile() 3274 ** req -- is the file required? 3275 ** ex -- does the file exist? 3276 ** st -- status bit to set if ok 3277 ** 3278 ** Side Effects: 3279 ** uses r, ok, ex; may change ok and status. 3280 ** 3281 */ 3282 3283 #define TLS_SAFE_F(var, sff, req, ex, st) if (ex && ok) \ 3284 { \ 3285 r = tls_safe_f(var, sff); \ 3286 if (r) \ 3287 status |= st; \ 3288 else if (req) \ 3289 ok = FALSE; \ 3290 } 3291 3292 /* 3293 ** INITTLS -- initialize TLS 3294 ** 3295 ** Parameters: 3296 ** ctx -- pointer to context 3297 ** req -- requirements for initialization (see sendmail.h) 3298 ** srv -- server side? 3299 ** certfile -- filename of certificate 3300 ** keyfile -- filename of private key 3301 ** cacertpath -- path to CAs 3302 ** cacertfile -- file with CA 3303 ** dhparam -- parameters for DH 3304 ** 3305 ** Returns: 3306 ** succeeded? 3307 */ 3308 3309 bool 3310 inittls(ctx, req, srv, certfile, keyfile, cacertpath, cacertfile, dhparam) 3311 SSL_CTX **ctx; 3312 u_long req; 3313 bool srv; 3314 char *certfile, *keyfile, *cacertpath, *cacertfile, *dhparam; 3315 { 3316 # if !NO_DH 3317 static DH *dh = NULL; 3318 # endif /* !NO_DH */ 3319 int r; 3320 bool ok; 3321 long sff, status; 3322 char *who; 3323 # if _FFR_TLS_1 3324 char *cf2, *kf2; 3325 # endif /* _FFR_TLS_1 */ 3326 3327 status = TLS_S_NONE; 3328 who = srv ? "srv" : "clt"; 3329 if (ctx == NULL) 3330 syserr("TLS: %s:inittls: ctx == NULL", who); 3331 3332 /* already initialized? (we could re-init...) */ 3333 if (*ctx != NULL) 3334 return TRUE; 3335 3336 /* PRNG seeded? */ 3337 if (!tls_rand_init(RandFile, 10)) 3338 return FALSE; 3339 3340 /* let's start with the assumption it will work */ 3341 ok = TRUE; 3342 3343 # if _FFR_TLS_1 3344 /* 3345 ** look for a second filename: it must be separated by a ',' 3346 ** no blanks allowed (they won't be skipped). 3347 ** we change a global variable here! this change will be undone 3348 ** before return from the function but only if it returns TRUE. 3349 ** this isn't a problem since in a failure case this function 3350 ** won't be called again with the same (overwritten) values. 3351 ** otherwise each return must be replaced with a goto endinittls. 3352 */ 3353 cf2 = NULL; 3354 kf2 = NULL; 3355 if (certfile != NULL && (cf2 = strchr(certfile, ',')) != NULL) 3356 { 3357 *cf2++ = '\0'; 3358 if (keyfile != NULL && (kf2 = strchr(keyfile, ',')) != NULL) 3359 *kf2++ = '\0'; 3360 } 3361 # endif /* _FFR_TLS_1 */ 3362 3363 /* 3364 ** what do we require from the client? 3365 ** must it have CERTs? 3366 ** introduce an option and decide based on that 3367 */ 3368 3369 TLS_OK_F(certfile, "CertFile", bitset(TLS_I_CERT_EX, req), 3370 TLS_S_CERT_EX); 3371 TLS_OK_F(keyfile, "KeyFile", bitset(TLS_I_KEY_EX, req), 3372 TLS_S_KEY_EX); 3373 TLS_OK_F(cacertpath, "CACERTPath", bitset(TLS_I_CERTP_EX, req), 3374 TLS_S_CERTP_EX); 3375 TLS_OK_F(cacertfile, "CACERTFile", bitset(TLS_I_CERTF_EX, req), 3376 TLS_S_CERTF_EX); 3377 3378 # if _FFR_TLS_1 3379 if (cf2 != NULL) 3380 { 3381 TLS_OK_F(cf2, "CertFile", bitset(TLS_I_CERT_EX, req), 3382 TLS_S_CERT2_EX); 3383 } 3384 if (kf2 != NULL) 3385 { 3386 TLS_OK_F(kf2, "KeyFile", bitset(TLS_I_KEY_EX, req), 3387 TLS_S_KEY2_EX); 3388 } 3389 # endif /* _FFR_TLS_1 */ 3390 3391 /* 3392 ** valid values for dhparam are (only the first char is checked) 3393 ** none no parameters: don't use DH 3394 ** 512 generate 512 bit parameters (fixed) 3395 ** 1024 generate 1024 bit parameters 3396 ** /file/name read parameters from /file/name 3397 ** default is: 1024 for server, 512 for client (OK? XXX) 3398 */ 3399 if (bitset(TLS_I_TRY_DH, req)) 3400 { 3401 if (dhparam != NULL) 3402 { 3403 char c = *dhparam; 3404 3405 if (c == '1') 3406 req |= TLS_I_DH1024; 3407 else if (c == '5') 3408 req |= TLS_I_DH512; 3409 else if (c != 'n' && c != 'N' && c != '/') 3410 { 3411 if (LogLevel > 12) 3412 sm_syslog(LOG_WARNING, NOQID, 3413 "TLS: error: illegal value '%s' for DHParam", 3414 dhparam); 3415 dhparam = NULL; 3416 } 3417 } 3418 if (dhparam == NULL) 3419 dhparam = srv ? "1" : "5"; 3420 else if (*dhparam == '/') 3421 { 3422 TLS_OK_F(dhparam, "DHParameters", 3423 bitset(TLS_I_DHPAR_EX, req), 3424 TLS_S_DHPAR_EX); 3425 } 3426 } 3427 if (!ok) 3428 return ok; 3429 3430 /* certfile etc. must be "safe". */ 3431 sff = SFF_REGONLY | SFF_SAFEDIRPATH | SFF_NOWLINK 3432 | SFF_NOGWFILES | SFF_NOWWFILES 3433 | SFF_MUSTOWN | SFF_ROOTOK | SFF_OPENASROOT; 3434 if (DontLockReadFiles) 3435 sff |= SFF_NOLOCK; 3436 3437 TLS_SAFE_F(certfile, sff | TLS_UNR(TLS_I_CERT_UNR, req), 3438 bitset(TLS_I_CERT_EX, req), 3439 bitset(TLS_S_CERT_EX, status), TLS_S_CERT_OK); 3440 TLS_SAFE_F(keyfile, sff | TLS_UNR(TLS_I_KEY_UNR, req), 3441 bitset(TLS_I_KEY_EX, req), 3442 bitset(TLS_S_KEY_EX, status), TLS_S_KEY_OK); 3443 TLS_SAFE_F(cacertfile, sff | TLS_UNR(TLS_I_CERTF_UNR, req), 3444 bitset(TLS_I_CERTF_EX, req), 3445 bitset(TLS_S_CERTF_EX, status), TLS_S_CERTF_OK); 3446 TLS_SAFE_F(dhparam, sff | TLS_UNR(TLS_I_DHPAR_UNR, req), 3447 bitset(TLS_I_DHPAR_EX, req), 3448 bitset(TLS_S_DHPAR_EX, status), TLS_S_DHPAR_OK); 3449 if (!ok) 3450 return ok; 3451 # if _FFR_TLS_1 3452 if (cf2 != NULL) 3453 { 3454 TLS_SAFE_F(cf2, sff | TLS_UNR(TLS_I_CERT_UNR, req), 3455 bitset(TLS_I_CERT_EX, req), 3456 bitset(TLS_S_CERT2_EX, status), TLS_S_CERT2_OK); 3457 } 3458 if (kf2 != NULL) 3459 { 3460 TLS_SAFE_F(kf2, sff | TLS_UNR(TLS_I_KEY_UNR, req), 3461 bitset(TLS_I_KEY_EX, req), 3462 bitset(TLS_S_KEY2_EX, status), TLS_S_KEY2_OK); 3463 } 3464 # endif /* _FFR_TLS_1 */ 3465 3466 /* create a method and a new context */ 3467 if (srv) 3468 { 3469 if ((*ctx = SSL_CTX_new(SSLv23_server_method())) == NULL) 3470 { 3471 if (LogLevel > 7) 3472 sm_syslog(LOG_WARNING, NOQID, 3473 "TLS: error: SSL_CTX_new(SSLv23_server_method()) failed"); 3474 return FALSE; 3475 } 3476 } 3477 else 3478 { 3479 if ((*ctx = SSL_CTX_new(SSLv23_client_method())) == NULL) 3480 { 3481 if (LogLevel > 7) 3482 sm_syslog(LOG_WARNING, NOQID, 3483 "TLS: error: SSL_CTX_new(SSLv23_client_method()) failed"); 3484 return FALSE; 3485 } 3486 } 3487 3488 # if TLS_NO_RSA 3489 /* turn off backward compatibility, required for no-rsa */ 3490 SSL_CTX_set_options(*ctx, SSL_OP_NO_SSLv2); 3491 # endif /* TLS_NO_RSA */ 3492 3493 3494 # if !TLS_NO_RSA 3495 /* 3496 ** Create a temporary RSA key 3497 ** XXX Maybe we shouldn't create this always (even though it 3498 ** is only at startup). 3499 ** It is a time-consuming operation and it is not always necessary. 3500 ** maybe we should do it only on demand... 3501 */ 3502 if (bitset(TLS_I_RSA_TMP, req) && 3503 (rsa_tmp = RSA_generate_key(RSA_KEYLENGTH, RSA_F4, NULL, 3504 NULL)) == NULL 3505 ) 3506 { 3507 if (LogLevel > 7) 3508 { 3509 sm_syslog(LOG_WARNING, NOQID, 3510 "TLS: error: %s: RSA_generate_key failed", 3511 who); 3512 if (LogLevel > 9) 3513 tlslogerr(); 3514 } 3515 return FALSE; 3516 } 3517 # endif /* !TLS_NO_RSA */ 3518 3519 /* 3520 ** load private key 3521 ** XXX change this for DSA-only version 3522 */ 3523 if (bitset(TLS_S_KEY_OK, status) && 3524 SSL_CTX_use_PrivateKey_file(*ctx, keyfile, 3525 SSL_FILETYPE_PEM) <= 0) 3526 { 3527 if (LogLevel > 7) 3528 { 3529 sm_syslog(LOG_WARNING, NOQID, 3530 "TLS: error: %s: SSL_CTX_use_PrivateKey_file(%s) failed", 3531 who, keyfile); 3532 if (LogLevel > 9) 3533 tlslogerr(); 3534 } 3535 if (bitset(TLS_I_USE_KEY, req)) 3536 return FALSE; 3537 } 3538 3539 /* get the certificate file */ 3540 if (bitset(TLS_S_CERT_OK, status) && 3541 SSL_CTX_use_certificate_file(*ctx, certfile, 3542 SSL_FILETYPE_PEM) <= 0) 3543 { 3544 if (LogLevel > 7) 3545 { 3546 sm_syslog(LOG_WARNING, NOQID, 3547 "TLS: error: %s: SSL_CTX_use_certificate_file(%s) failed", 3548 who, certfile); 3549 if (LogLevel > 9) 3550 tlslogerr(); 3551 } 3552 if (bitset(TLS_I_USE_CERT, req)) 3553 return FALSE; 3554 } 3555 3556 /* check the private key */ 3557 if (bitset(TLS_S_KEY_OK, status) && 3558 (r = SSL_CTX_check_private_key(*ctx)) <= 0) 3559 { 3560 /* Private key does not match the certificate public key */ 3561 if (LogLevel > 5) 3562 { 3563 sm_syslog(LOG_WARNING, NOQID, 3564 "TLS: error: %s: SSL_CTX_check_private_key failed(%s): %d", 3565 who, keyfile, r); 3566 if (LogLevel > 9) 3567 tlslogerr(); 3568 } 3569 if (bitset(TLS_I_USE_KEY, req)) 3570 return FALSE; 3571 } 3572 3573 # if _FFR_TLS_1 3574 /* XXX this code is pretty much duplicated from above! */ 3575 3576 /* load private key */ 3577 if (bitset(TLS_S_KEY2_OK, status) && 3578 SSL_CTX_use_PrivateKey_file(*ctx, kf2, SSL_FILETYPE_PEM) <= 0) 3579 { 3580 if (LogLevel > 7) 3581 { 3582 sm_syslog(LOG_WARNING, NOQID, 3583 "TLS: error: %s: SSL_CTX_use_PrivateKey_file(%s) failed", 3584 who, kf2); 3585 if (LogLevel > 9) 3586 tlslogerr(); 3587 } 3588 } 3589 3590 /* get the certificate file */ 3591 if (bitset(TLS_S_CERT2_OK, status) && 3592 SSL_CTX_use_certificate_file(*ctx, cf2, SSL_FILETYPE_PEM) <= 0) 3593 { 3594 if (LogLevel > 7) 3595 { 3596 sm_syslog(LOG_WARNING, NOQID, 3597 "TLS: error: %s: SSL_CTX_use_certificate_file(%s) failed", 3598 who, cf2); 3599 if (LogLevel > 9) 3600 tlslogerr(); 3601 } 3602 } 3603 3604 /* we should also check the private key: */ 3605 if (bitset(TLS_S_KEY2_OK, status) && 3606 (r = SSL_CTX_check_private_key(*ctx)) <= 0) 3607 { 3608 /* Private key does not match the certificate public key */ 3609 if (LogLevel > 5) 3610 { 3611 sm_syslog(LOG_WARNING, NOQID, 3612 "TLS: error: %s: SSL_CTX_check_private_key 2 failed: %d", 3613 who, r); 3614 if (LogLevel > 9) 3615 tlslogerr(); 3616 } 3617 } 3618 # endif /* _FFR_TLS_1 */ 3619 3620 /* SSL_CTX_set_quiet_shutdown(*ctx, 1); violation of standard? */ 3621 SSL_CTX_set_options(*ctx, SSL_OP_ALL); /* XXX bug compatibility? */ 3622 3623 # if !NO_DH 3624 /* Diffie-Hellman initialization */ 3625 if (bitset(TLS_I_TRY_DH, req)) 3626 { 3627 if (bitset(TLS_S_DHPAR_OK, status)) 3628 { 3629 BIO *bio; 3630 3631 if ((bio = BIO_new_file(dhparam, "r")) != NULL) 3632 { 3633 dh = PEM_read_bio_DHparams(bio, NULL, NULL, NULL); 3634 BIO_free(bio); 3635 if (dh == NULL && LogLevel > 7) 3636 { 3637 u_long err; 3638 3639 err = ERR_get_error(); 3640 sm_syslog(LOG_WARNING, NOQID, 3641 "TLS: error: %s: cannot read DH parameters(%s): %s", 3642 who, dhparam, 3643 ERR_error_string(err, NULL)); 3644 if (LogLevel > 9) 3645 tlslogerr(); 3646 } 3647 } 3648 else 3649 { 3650 if (LogLevel > 5) 3651 { 3652 sm_syslog(LOG_WARNING, NOQID, 3653 "TLS: error: %s: BIO_new_file(%s) failed", 3654 who, dhparam); 3655 if (LogLevel > 9) 3656 tlslogerr(); 3657 } 3658 } 3659 } 3660 if (dh == NULL && bitset(TLS_I_DH1024, req)) 3661 { 3662 DSA *dsa; 3663 3664 /* this takes a while! (7-130s on a 450MHz AMD K6-2) */ 3665 dsa = DSA_generate_parameters(1024, NULL, 0, NULL, 3666 NULL, 0, NULL); 3667 dh = DSA_dup_DH(dsa); 3668 DSA_free(dsa); 3669 } 3670 else 3671 if (dh == NULL && bitset(TLS_I_DH512, req)) 3672 dh = get_dh512(); 3673 3674 if (dh == NULL) 3675 { 3676 if (LogLevel > 9) 3677 { 3678 u_long err; 3679 3680 err = ERR_get_error(); 3681 sm_syslog(LOG_WARNING, NOQID, 3682 "TLS: error: %s: cannot read or set DH parameters(%s): %s", 3683 who, dhparam, 3684 ERR_error_string(err, NULL)); 3685 } 3686 if (bitset(TLS_I_REQ_DH, req)) 3687 return FALSE; 3688 } 3689 else 3690 { 3691 SSL_CTX_set_tmp_dh(*ctx, dh); 3692 3693 /* important to avoid small subgroup attacks */ 3694 SSL_CTX_set_options(*ctx, SSL_OP_SINGLE_DH_USE); 3695 if (LogLevel > 12) 3696 sm_syslog(LOG_INFO, NOQID, 3697 "TLS: %s: Diffie-Hellman init, key=%d bit (%c)", 3698 who, 8 * DH_size(dh), *dhparam); 3699 DH_free(dh); 3700 } 3701 } 3702 # endif /* !NO_DH */ 3703 3704 3705 /* XXX do we need this cache here? */ 3706 if (bitset(TLS_I_CACHE, req)) 3707 SSL_CTX_sess_set_cache_size(*ctx, 128); 3708 /* timeout? SSL_CTX_set_timeout(*ctx, TimeOut...); */ 3709 3710 /* load certificate locations and default CA paths */ 3711 if (bitset(TLS_S_CERTP_EX, status) && bitset(TLS_S_CERTF_EX, status)) 3712 { 3713 if ((r = SSL_CTX_load_verify_locations(*ctx, cacertfile, 3714 cacertpath)) == 1) 3715 { 3716 # if !TLS_NO_RSA 3717 if (bitset(TLS_I_RSA_TMP, req)) 3718 SSL_CTX_set_tmp_rsa_callback(*ctx, tmp_rsa_key); 3719 # endif /* !TLS_NO_RSA */ 3720 3721 /* ask to verify the peer */ 3722 SSL_CTX_set_verify(*ctx, SSL_VERIFY_PEER, NULL); 3723 3724 /* install verify callback */ 3725 SSL_CTX_set_cert_verify_callback(*ctx, tls_verify_cb, 3726 NULL); 3727 SSL_CTX_set_client_CA_list(*ctx, 3728 SSL_load_client_CA_file(cacertfile)); 3729 } 3730 else 3731 { 3732 /* 3733 ** can't load CA data; do we care? 3734 ** the data is necessary to authenticate the client, 3735 ** which in turn would be necessary 3736 ** if we want to allow relaying based on it. 3737 */ 3738 if (LogLevel > 5) 3739 { 3740 sm_syslog(LOG_WARNING, NOQID, 3741 "TLS: error: %s: %d load verify locs %s, %s", 3742 who, r, cacertpath, cacertfile); 3743 if (LogLevel > 9) 3744 tlslogerr(); 3745 } 3746 if (bitset(TLS_I_VRFY_LOC, req)) 3747 return FALSE; 3748 } 3749 } 3750 3751 /* XXX: make this dependent on an option? */ 3752 if (tTd(96, 9)) 3753 SSL_CTX_set_info_callback(*ctx, apps_ssl_info_cb); 3754 3755 # if _FFR_TLS_1 3756 /* 3757 ** XXX install our own cipher list: option? 3758 */ 3759 if (CipherList != NULL && *CipherList != '\0') 3760 { 3761 if (SSL_CTX_set_cipher_list(*ctx, CipherList) <= 0) 3762 { 3763 if (LogLevel > 7) 3764 { 3765 sm_syslog(LOG_WARNING, NOQID, 3766 "TLS: error: %s: SSL_CTX_set_cipher_list(%s) failed, list ignored", 3767 who, CipherList); 3768 3769 if (LogLevel > 9) 3770 tlslogerr(); 3771 } 3772 /* failure if setting to this list is required? */ 3773 } 3774 } 3775 # endif /* _FFR_TLS_1 */ 3776 if (LogLevel > 12) 3777 sm_syslog(LOG_INFO, NOQID, "TLS: init(%s)=%d", who, ok); 3778 3779 # if _FFR_TLS_1 3780 # if 0 3781 /* 3782 ** this label is required if we want to have a "clean" exit 3783 ** see the comments above at the initialization of cf2 3784 */ 3785 endinittls: 3786 # endif /* 0 */ 3787 3788 /* undo damage to global variables */ 3789 if (cf2 != NULL) 3790 *--cf2 = ','; 3791 if (kf2 != NULL) 3792 *--kf2 = ','; 3793 # endif /* _FFR_TLS_1 */ 3794 3795 return ok; 3796 } 3797 /* 3798 ** INITSRVTLS -- initialize server side TLS 3799 ** 3800 ** Parameters: 3801 ** none. 3802 ** 3803 ** Returns: 3804 ** succeeded? 3805 */ 3806 3807 bool 3808 initsrvtls() 3809 { 3810 3811 tls_ok = inittls(&srv_ctx, TLS_I_SRV, TRUE, SrvCERTfile, Srvkeyfile, 3812 CACERTpath, CACERTfile, DHParams); 3813 return tls_ok; 3814 } 3815 /* 3816 ** TLS_GET_INFO -- get information about TLS connection 3817 ** 3818 ** Parameters: 3819 ** ssl -- SSL connection structure 3820 ** e -- current envelope 3821 ** srv -- server or client 3822 ** host -- hostname of other side 3823 ** log -- log connection information? 3824 ** 3825 ** Returns: 3826 ** result of authentication. 3827 ** 3828 ** Side Effects: 3829 ** sets ${cipher}, ${tls_version}, ${verify}, ${cipher_bits}, 3830 ** ${cert} 3831 */ 3832 3833 int 3834 tls_get_info(ssl, e, srv, host, log) 3835 SSL *ssl; 3836 ENVELOPE *e; 3837 bool srv; 3838 char *host; 3839 bool log; 3840 { 3841 SSL_CIPHER *c; 3842 int b, r; 3843 char *s; 3844 char bitstr[16]; 3845 X509 *cert; 3846 3847 c = SSL_get_current_cipher(ssl); 3848 define(macid("{cipher}", NULL), newstr(SSL_CIPHER_get_name(c)), e); 3849 b = SSL_CIPHER_get_bits(c, &r); 3850 (void) snprintf(bitstr, sizeof bitstr, "%d", b); 3851 define(macid("{cipher_bits}", NULL), newstr(bitstr), e); 3852 # if _FFR_TLS_1 3853 (void) snprintf(bitstr, sizeof bitstr, "%d", r); 3854 define(macid("{alg_bits}", NULL), newstr(bitstr), e); 3855 # endif /* _FFR_TLS_1 */ 3856 s = SSL_CIPHER_get_version(c); 3857 if (s == NULL) 3858 s = "UNKNOWN"; 3859 define(macid("{tls_version}", NULL), newstr(s), e); 3860 3861 cert = SSL_get_peer_certificate(ssl); 3862 if (log && LogLevel >= 14) 3863 sm_syslog(LOG_INFO, e->e_id, 3864 "TLS: get_verify in %s: %ld get_peer: 0x%lx", 3865 srv ? "srv" : "clt", 3866 SSL_get_verify_result(ssl), (u_long) cert); 3867 if (cert != NULL) 3868 { 3869 char buf[MAXNAME]; 3870 3871 X509_NAME_oneline(X509_get_subject_name(cert), 3872 buf, sizeof buf); 3873 define(macid("{cert_subject}", NULL), 3874 newstr(xtextify(buf, "<>\")")), e); 3875 X509_NAME_oneline(X509_get_issuer_name(cert), 3876 buf, sizeof buf); 3877 define(macid("{cert_issuer}", NULL), 3878 newstr(xtextify(buf, "<>\")")), e); 3879 # if _FFR_TLS_1 3880 X509_NAME_get_text_by_NID(X509_get_subject_name(cert), 3881 NID_commonName, buf, sizeof buf); 3882 define(macid("{cn_subject}", NULL), 3883 newstr(xtextify(buf, "<>\")")), e); 3884 X509_NAME_get_text_by_NID(X509_get_issuer_name(cert), 3885 NID_commonName, buf, sizeof buf); 3886 define(macid("{cn_issuer}", NULL), 3887 newstr(xtextify(buf, "<>\")")), e); 3888 # endif /* _FFR_TLS_1 */ 3889 } 3890 else 3891 { 3892 define(macid("{cert_subject}", NULL), "", e); 3893 define(macid("{cert_issuer}", NULL), "", e); 3894 # if _FFR_TLS_1 3895 define(macid("{cn_subject}", NULL), "", e); 3896 define(macid("{cn_issuer}", NULL), "", e); 3897 # endif /* _FFR_TLS_1 */ 3898 } 3899 switch(SSL_get_verify_result(ssl)) 3900 { 3901 case X509_V_OK: 3902 if (cert != NULL) 3903 { 3904 s = "OK"; 3905 r = TLS_AUTH_OK; 3906 } 3907 else 3908 { 3909 s = "NO"; 3910 r = TLS_AUTH_NO; 3911 } 3912 break; 3913 default: 3914 s = "FAIL"; 3915 r = TLS_AUTH_FAIL; 3916 break; 3917 } 3918 define(macid("{verify}", NULL), newstr(s), e); 3919 if (cert != NULL) 3920 X509_free(cert); 3921 3922 /* do some logging */ 3923 if (log && LogLevel > 9) 3924 { 3925 char *vers, *s1, *s2, *bits; 3926 3927 vers = macvalue(macid("{tls_version}", NULL), e); 3928 bits = macvalue(macid("{cipher_bits}", NULL), e); 3929 s1 = macvalue(macid("{verify}", NULL), e); 3930 s2 = macvalue(macid("{cipher}", NULL), e); 3931 sm_syslog(LOG_INFO, NOQID, 3932 "TLS: connection %s %.64s, version=%.16s, verify=%.16s, cipher=%.64s, bits=%.6s", 3933 srv ? "from" : "to", 3934 host == NULL ? "none" : host, 3935 vers == NULL ? "none" : vers, 3936 s1 == NULL ? "none" : s1, 3937 s2 == NULL ? "none" : s2, 3938 bits == NULL ? "0" : bits); 3939 if (LogLevel > 11) 3940 { 3941 /* 3942 ** maybe run xuntextify on the strings? 3943 ** that is easier to read but makes it maybe a bit 3944 ** more complicated to figure out the right values 3945 ** for the access map... 3946 */ 3947 s1 = macvalue(macid("{cert_subject}", NULL), e); 3948 s2 = macvalue(macid("{cert_issuer}", NULL), e); 3949 sm_syslog(LOG_INFO, NOQID, 3950 "TLS: %s cert subject:%.128s, cert issuer=%.128s", 3951 srv ? "client" : "server", 3952 s1 == NULL ? "none" : s1, 3953 s2 == NULL ? "none" : s2); 3954 } 3955 } 3956 3957 return r; 3958 } 3959 3960 # if !TLS_NO_RSA 3961 /* 3962 ** TMP_RSA_KEY -- return temporary RSA key 3963 ** 3964 ** Parameters: 3965 ** s -- SSL connection structure 3966 ** export -- 3967 ** keylength -- 3968 ** 3969 ** Returns: 3970 ** temporary RSA key. 3971 */ 3972 3973 /* ARGUSED0 */ 3974 static RSA * 3975 tmp_rsa_key(s, export, keylength) 3976 SSL *s; 3977 int export; 3978 int keylength; 3979 { 3980 return rsa_tmp; 3981 } 3982 # endif /* !TLS_NO_RSA */ 3983 /* 3984 ** APPS_SSL_INFO_CB -- info callback for TLS connections 3985 ** 3986 ** Parameters: 3987 ** s -- SSL connection structure 3988 ** where -- 3989 ** ret -- 3990 ** 3991 ** Returns: 3992 ** none. 3993 */ 3994 3995 void 3996 apps_ssl_info_cb(s, where, ret) 3997 SSL *s; 3998 int where; 3999 int ret; 4000 { 4001 char *str; 4002 int w; 4003 BIO *bio_err = NULL; 4004 4005 if (LogLevel > 14) 4006 sm_syslog(LOG_INFO, NOQID, 4007 "info_callback where 0x%x ret %d", where, ret); 4008 4009 w = where & ~SSL_ST_MASK; 4010 if (bio_err == NULL) 4011 bio_err = BIO_new_fp(stderr, BIO_NOCLOSE); 4012 4013 if (w & SSL_ST_CONNECT) 4014 str = "SSL_connect"; 4015 else if (w & SSL_ST_ACCEPT) 4016 str = "SSL_accept"; 4017 else 4018 str = "undefined"; 4019 4020 if (where & SSL_CB_LOOP) 4021 { 4022 if (LogLevel > 12) 4023 sm_syslog(LOG_NOTICE, NOQID, 4024 "%s:%s\n", str, SSL_state_string_long(s)); 4025 } 4026 else if (where & SSL_CB_ALERT) 4027 { 4028 str = (where & SSL_CB_READ) ? "read" : "write"; 4029 if (LogLevel > 12) 4030 sm_syslog(LOG_NOTICE, NOQID, 4031 "SSL3 alert %s:%s:%s\n", 4032 str, SSL_alert_type_string_long(ret), 4033 SSL_alert_desc_string_long(ret)); 4034 } 4035 else if (where & SSL_CB_EXIT) 4036 { 4037 if (ret == 0) 4038 { 4039 if (LogLevel > 7) 4040 sm_syslog(LOG_WARNING, NOQID, 4041 "%s:failed in %s\n", 4042 str, SSL_state_string_long(s)); 4043 } 4044 else if (ret < 0) 4045 { 4046 if (LogLevel > 7) 4047 sm_syslog(LOG_WARNING, NOQID, 4048 "%s:error in %s\n", 4049 str, SSL_state_string_long(s)); 4050 } 4051 } 4052 } 4053 /* 4054 ** TLS_VERIFY_LOG -- log verify error for TLS certificates 4055 ** 4056 ** Parameters: 4057 ** ok -- verify ok? 4058 ** ctx -- x509 context 4059 ** 4060 ** Returns: 4061 ** 0 -- fatal error 4062 ** 1 -- ok 4063 */ 4064 4065 static int 4066 tls_verify_log(ok, ctx) 4067 int ok; 4068 X509_STORE_CTX *ctx; 4069 { 4070 SSL *ssl; 4071 X509 *cert; 4072 int reason, depth; 4073 char buf[512]; 4074 4075 cert = X509_STORE_CTX_get_current_cert(ctx); 4076 reason = X509_STORE_CTX_get_error(ctx); 4077 depth = X509_STORE_CTX_get_error_depth(ctx); 4078 ssl = (SSL *)X509_STORE_CTX_get_ex_data(ctx, 4079 SSL_get_ex_data_X509_STORE_CTX_idx()); 4080 4081 if (ssl == NULL) 4082 { 4083 /* internal error */ 4084 sm_syslog(LOG_ERR, NOQID, 4085 "TLS: internal error: tls_verify_cb: ssl == NULL"); 4086 return 0; 4087 } 4088 4089 X509_NAME_oneline(X509_get_subject_name(cert), buf, sizeof buf); 4090 sm_syslog(LOG_INFO, NOQID, 4091 "TLS cert verify: depth=%d %s, state=%d, reason=%s\n", 4092 depth, buf, ok, X509_verify_cert_error_string(reason)); 4093 return 1; 4094 } 4095 4096 /* 4097 ** TLS_VERIFY_CB -- verify callback for TLS certificates 4098 ** 4099 ** Parameters: 4100 ** ctx -- x509 context 4101 ** 4102 ** Returns: 4103 ** accept connection? 4104 ** currently: always yes. 4105 */ 4106 4107 static int 4108 tls_verify_cb(ctx) 4109 X509_STORE_CTX *ctx; 4110 { 4111 int ok; 4112 4113 ok = X509_verify_cert(ctx); 4114 if (ok == 0) 4115 { 4116 if (LogLevel > 13) 4117 return tls_verify_log(ok, ctx); 4118 return 1; /* override it */ 4119 } 4120 return ok; 4121 } 4122 4123 4124 /* 4125 ** TLSLOGERR -- log the errors from the TLS error stack 4126 ** 4127 ** Parameters: 4128 ** none. 4129 ** 4130 ** Returns: 4131 ** none. 4132 */ 4133 4134 void 4135 tlslogerr() 4136 { 4137 unsigned long l; 4138 int line, flags; 4139 unsigned long es; 4140 char *file, *data; 4141 char buf[256]; 4142 #define CP (const char **) 4143 4144 es = CRYPTO_thread_id(); 4145 while ((l = ERR_get_error_line_data(CP &file, &line, CP &data, &flags)) 4146 != 0) 4147 { 4148 sm_syslog(LOG_WARNING, NOQID, 4149 "TLS: %lu:%s:%s:%d:%s\n", es, ERR_error_string(l, buf), 4150 file, line, (flags & ERR_TXT_STRING) ? data : ""); 4151 } 4152 } 4153 4154 # endif /* STARTTLS */ 4155 #endif /* SMTP */ 4156 /* 4157 ** HELP -- implement the HELP command. 4158 ** 4159 ** Parameters: 4160 ** topic -- the topic we want help for. 4161 ** e -- envelope 4162 ** 4163 ** Returns: 4164 ** none. 4165 ** 4166 ** Side Effects: 4167 ** outputs the help file to message output. 4168 */ 4169 #define HELPVSTR "#vers " 4170 #define HELPVERSION 2 4171 4172 void 4173 help(topic, e) 4174 char *topic; 4175 ENVELOPE *e; 4176 { 4177 register FILE *hf; 4178 register char *p; 4179 int len; 4180 bool noinfo; 4181 bool first = TRUE; 4182 long sff = SFF_OPENASROOT|SFF_REGONLY; 4183 char buf[MAXLINE]; 4184 char inp[MAXLINE]; 4185 static int foundvers = -1; 4186 extern char Version[]; 4187 4188 if (DontLockReadFiles) 4189 sff |= SFF_NOLOCK; 4190 if (!bitnset(DBS_HELPFILEINUNSAFEDIRPATH, DontBlameSendmail)) 4191 sff |= SFF_SAFEDIRPATH; 4192 4193 if (HelpFile == NULL || 4194 (hf = safefopen(HelpFile, O_RDONLY, 0444, sff)) == NULL) 4195 { 4196 /* no help */ 4197 errno = 0; 4198 message("502 5.3.0 Sendmail %s -- HELP not implemented", 4199 Version); 4200 return; 4201 } 4202 4203 if (topic == NULL || *topic == '\0') 4204 { 4205 topic = "smtp"; 4206 noinfo = FALSE; 4207 } 4208 else 4209 { 4210 makelower(topic); 4211 noinfo = TRUE; 4212 } 4213 4214 len = strlen(topic); 4215 4216 while (fgets(buf, sizeof buf, hf) != NULL) 4217 { 4218 if (buf[0] == '#') 4219 { 4220 if (foundvers < 0 && 4221 strncmp(buf, HELPVSTR, strlen(HELPVSTR)) == 0) 4222 { 4223 int h; 4224 4225 if (sscanf(buf + strlen(HELPVSTR), "%d", 4226 &h) == 1) 4227 foundvers = h; 4228 } 4229 continue; 4230 } 4231 if (strncmp(buf, topic, len) == 0) 4232 { 4233 if (first) 4234 { 4235 first = FALSE; 4236 4237 /* print version if no/old vers# in file */ 4238 if (foundvers < 2 && !noinfo) 4239 message("214-2.0.0 This is Sendmail version %s", Version); 4240 } 4241 p = strpbrk(buf, " \t"); 4242 if (p == NULL) 4243 p = buf + strlen(buf) - 1; 4244 else 4245 p++; 4246 fixcrlf(p, TRUE); 4247 if (foundvers >= 2) 4248 { 4249 translate_dollars(p); 4250 expand(p, inp, sizeof inp, e); 4251 p = inp; 4252 } 4253 message("214-2.0.0 %s", p); 4254 noinfo = FALSE; 4255 } 4256 } 4257 4258 if (noinfo) 4259 message("504 5.3.0 HELP topic \"%.10s\" unknown", topic); 4260 else 4261 message("214 2.0.0 End of HELP info"); 4262 4263 if (foundvers != 0 && foundvers < HELPVERSION) 4264 { 4265 if (LogLevel > 1) 4266 sm_syslog(LOG_WARNING, e->e_id, 4267 "%s too old (require version %d)", 4268 HelpFile, HELPVERSION); 4269 4270 /* avoid log next time */ 4271 foundvers = 0; 4272 } 4273 4274 (void) fclose(hf); 4275 } 4276