1 /* 2 * Copyright (c) 1998-2003 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 #include <sendmail.h> 15 #if MILTER 16 # include <libmilter/mfdef.h> 17 #endif /* MILTER */ 18 19 SM_RCSID("@(#)$Id: srvrsmtp.c,v 8.829.2.31 2003/07/01 17:30:01 ca Exp $") 20 21 #if SASL || STARTTLS 22 # include <sys/time.h> 23 # include "sfsasl.h" 24 #endif /* SASL || STARTTLS */ 25 #if SASL 26 # define ENC64LEN(l) (((l) + 2) * 4 / 3 + 1) 27 static int saslmechs __P((sasl_conn_t *, char **)); 28 #endif /* SASL */ 29 #if STARTTLS 30 # include <sysexits.h> 31 32 static SSL_CTX *srv_ctx = NULL; /* TLS server context */ 33 static SSL *srv_ssl = NULL; /* per connection context */ 34 35 static bool tls_ok_srv = false; 36 37 extern void tls_set_verify __P((SSL_CTX *, SSL *, bool)); 38 # define TLS_VERIFY_CLIENT() tls_set_verify(srv_ctx, srv_ssl, \ 39 bitset(SRV_VRFY_CLT, features)) 40 #endif /* STARTTLS */ 41 42 /* server features */ 43 #define SRV_NONE 0x0000 /* none... */ 44 #define SRV_OFFER_TLS 0x0001 /* offer STARTTLS */ 45 #define SRV_VRFY_CLT 0x0002 /* request a cert */ 46 #define SRV_OFFER_AUTH 0x0004 /* offer AUTH */ 47 #define SRV_OFFER_ETRN 0x0008 /* offer ETRN */ 48 #define SRV_OFFER_VRFY 0x0010 /* offer VRFY (not yet used) */ 49 #define SRV_OFFER_EXPN 0x0020 /* offer EXPN */ 50 #define SRV_OFFER_VERB 0x0040 /* offer VERB */ 51 #define SRV_OFFER_DSN 0x0080 /* offer DSN */ 52 #if PIPELINING 53 # define SRV_OFFER_PIPE 0x0100 /* offer PIPELINING */ 54 # if _FFR_NO_PIPE 55 # define SRV_NO_PIPE 0x0200 /* disable PIPELINING, sleep if used */ 56 # endif /* _FFR_NO_PIPE */ 57 #endif /* PIPELINING */ 58 #define SRV_REQ_AUTH 0x0400 /* require AUTH */ 59 #define SRV_TMP_FAIL 0x1000 /* ruleset caused a temporary failure */ 60 61 static unsigned int srvfeatures __P((ENVELOPE *, char *, unsigned int)); 62 63 static time_t checksmtpattack __P((volatile unsigned int *, int, bool, 64 char *, ENVELOPE *)); 65 static void mail_esmtp_args __P((char *, char *, ENVELOPE *)); 66 static void printvrfyaddr __P((ADDRESS *, bool, bool)); 67 static void rcpt_esmtp_args __P((ADDRESS *, char *, char *, ENVELOPE *)); 68 static char *skipword __P((char *volatile, char *)); 69 static void setup_smtpd_io __P((void)); 70 71 #if SASL 72 # if SASL >= 20000 73 static int reset_saslconn __P((sasl_conn_t **_conn, char *_hostname, 74 char *_remoteip, char *_localip, 75 char *_auth_id, sasl_ssf_t *_ext_ssf)); 76 77 # define RESET_SASLCONN \ 78 result = reset_saslconn(&conn, hostname, remoteip, localip, auth_id, \ 79 &ext_ssf); \ 80 if (result != SASL_OK) \ 81 { \ 82 /* This is pretty fatal */ \ 83 goto doquit; \ 84 } 85 86 # else /* SASL >= 20000 */ 87 static int reset_saslconn __P((sasl_conn_t **_conn, char *_hostname, 88 struct sockaddr_in *_saddr_r, 89 struct sockaddr_in *_saddr_l, 90 sasl_external_properties_t *_ext_ssf)); 91 # define RESET_SASLCONN \ 92 result = reset_saslconn(&conn, hostname, &saddr_r, &saddr_l, &ext_ssf); \ 93 if (result != SASL_OK) \ 94 { \ 95 /* This is pretty fatal */ \ 96 goto doquit; \ 97 } 98 99 # endif /* SASL >= 20000 */ 100 #endif /* SASL */ 101 102 extern ENVELOPE BlankEnvelope; 103 104 #define SKIP_SPACE(s) while (isascii(*s) && isspace(*s)) \ 105 (s)++ 106 107 /* 108 ** SMTP -- run the SMTP protocol. 109 ** 110 ** Parameters: 111 ** nullserver -- if non-NULL, rejection message for 112 ** (almost) all SMTP commands. 113 ** d_flags -- daemon flags 114 ** e -- the envelope. 115 ** 116 ** Returns: 117 ** never. 118 ** 119 ** Side Effects: 120 ** Reads commands from the input channel and processes them. 121 */ 122 123 /* 124 ** Notice: The smtp server doesn't have a session context like the client 125 ** side has (mci). Therefore some data (session oriented) is allocated 126 ** or assigned to the "wrong" structure (esp. STARTTLS, AUTH). 127 ** This should be fixed in a successor version. 128 */ 129 130 struct cmd 131 { 132 char *cmd_name; /* command name */ 133 int cmd_code; /* internal code, see below */ 134 }; 135 136 /* values for cmd_code */ 137 #define CMDERROR 0 /* bad command */ 138 #define CMDMAIL 1 /* mail -- designate sender */ 139 #define CMDRCPT 2 /* rcpt -- designate recipient */ 140 #define CMDDATA 3 /* data -- send message text */ 141 #define CMDRSET 4 /* rset -- reset state */ 142 #define CMDVRFY 5 /* vrfy -- verify address */ 143 #define CMDEXPN 6 /* expn -- expand address */ 144 #define CMDNOOP 7 /* noop -- do nothing */ 145 #define CMDQUIT 8 /* quit -- close connection and die */ 146 #define CMDHELO 9 /* helo -- be polite */ 147 #define CMDHELP 10 /* help -- give usage info */ 148 #define CMDEHLO 11 /* ehlo -- extended helo (RFC 1425) */ 149 #define CMDETRN 12 /* etrn -- flush queue */ 150 #if SASL 151 # define CMDAUTH 13 /* auth -- SASL authenticate */ 152 #endif /* SASL */ 153 #if STARTTLS 154 # define CMDSTLS 14 /* STARTTLS -- start TLS session */ 155 #endif /* STARTTLS */ 156 /* non-standard commands */ 157 #define CMDVERB 17 /* verb -- go into verbose mode */ 158 /* unimplemented commands from RFC 821 */ 159 #define CMDUNIMPL 19 /* unimplemented rfc821 commands */ 160 /* use this to catch and log "door handle" attempts on your system */ 161 #define CMDLOGBOGUS 23 /* bogus command that should be logged */ 162 /* debugging-only commands, only enabled if SMTPDEBUG is defined */ 163 #define CMDDBGQSHOW 24 /* showq -- show send queue */ 164 #define CMDDBGDEBUG 25 /* debug -- set debug mode */ 165 166 /* 167 ** Note: If you change this list, remember to update 'helpfile' 168 */ 169 170 static struct cmd CmdTab[] = 171 { 172 { "mail", CMDMAIL }, 173 { "rcpt", CMDRCPT }, 174 { "data", CMDDATA }, 175 { "rset", CMDRSET }, 176 { "vrfy", CMDVRFY }, 177 { "expn", CMDEXPN }, 178 { "help", CMDHELP }, 179 { "noop", CMDNOOP }, 180 { "quit", CMDQUIT }, 181 { "helo", CMDHELO }, 182 { "ehlo", CMDEHLO }, 183 { "etrn", CMDETRN }, 184 { "verb", CMDVERB }, 185 { "send", CMDUNIMPL }, 186 { "saml", CMDUNIMPL }, 187 { "soml", CMDUNIMPL }, 188 { "turn", CMDUNIMPL }, 189 #if SASL 190 { "auth", CMDAUTH, }, 191 #endif /* SASL */ 192 #if STARTTLS 193 { "starttls", CMDSTLS, }, 194 #endif /* STARTTLS */ 195 /* remaining commands are here only to trap and log attempts to use them */ 196 { "showq", CMDDBGQSHOW }, 197 { "debug", CMDDBGDEBUG }, 198 { "wiz", CMDLOGBOGUS }, 199 200 { NULL, CMDERROR } 201 }; 202 203 static char *CurSmtpClient; /* who's at the other end of channel */ 204 205 #ifndef MAXBADCOMMANDS 206 # define MAXBADCOMMANDS 25 /* maximum number of bad commands */ 207 #endif /* ! MAXBADCOMMANDS */ 208 #ifndef MAXNOOPCOMMANDS 209 # define MAXNOOPCOMMANDS 20 /* max "noise" commands before slowdown */ 210 #endif /* ! MAXNOOPCOMMANDS */ 211 #ifndef MAXHELOCOMMANDS 212 # define MAXHELOCOMMANDS 3 /* max HELO/EHLO commands before slowdown */ 213 #endif /* ! MAXHELOCOMMANDS */ 214 #ifndef MAXVRFYCOMMANDS 215 # define MAXVRFYCOMMANDS 6 /* max VRFY/EXPN commands before slowdown */ 216 #endif /* ! MAXVRFYCOMMANDS */ 217 #ifndef MAXETRNCOMMANDS 218 # define MAXETRNCOMMANDS 8 /* max ETRN commands before slowdown */ 219 #endif /* ! MAXETRNCOMMANDS */ 220 #ifndef MAXTIMEOUT 221 # define MAXTIMEOUT (4 * 60) /* max timeout for bad commands */ 222 #endif /* ! MAXTIMEOUT */ 223 224 #if SM_HEAP_CHECK 225 static SM_DEBUG_T DebugLeakSmtp = SM_DEBUG_INITIALIZER("leak_smtp", 226 "@(#)$Debug: leak_smtp - trace memory leaks during SMTP processing $"); 227 #endif /* SM_HEAP_CHECK */ 228 229 typedef struct 230 { 231 bool sm_gotmail; /* mail command received */ 232 unsigned int sm_nrcpts; /* number of successful RCPT commands */ 233 #if _FFR_ADAPTIVE_EOL 234 WARNING: do NOT use this FFR, it is most likely broken 235 bool sm_crlf; /* input in CRLF form? */ 236 #endif /* _FFR_ADAPTIVE_EOL */ 237 bool sm_discard; 238 #if MILTER 239 bool sm_milterize; 240 bool sm_milterlist; /* any filters in the list? */ 241 #endif /* MILTER */ 242 #if _FFR_QUARANTINE 243 char *sm_quarmsg; /* carry quarantining across messages */ 244 #endif /* _FFR_QUARANTINE */ 245 } SMTP_T; 246 247 static void smtp_data __P((SMTP_T *, ENVELOPE *)); 248 249 #define MSG_TEMPFAIL "451 4.7.1 Please try again later" 250 251 #if MILTER 252 # define MILTER_ABORT(e) milter_abort((e)) 253 254 #if _FFR_MILTER_421 255 # define MILTER_SHUTDOWN \ 256 if (strncmp(response, "421 ", 4) == 0) \ 257 { \ 258 e->e_sendqueue = NULL; \ 259 goto doquit; \ 260 } 261 #else /* _FFR_MILTER_421 */ 262 # define MILTER_SHUTDOWN 263 #endif /* _FFR_MILTER_421 */ 264 265 # define MILTER_REPLY(str) \ 266 { \ 267 int savelogusrerrs = LogUsrErrs; \ 268 \ 269 switch (state) \ 270 { \ 271 case SMFIR_REPLYCODE: \ 272 if (MilterLogLevel > 3) \ 273 { \ 274 sm_syslog(LOG_INFO, e->e_id, \ 275 "Milter: %s=%s, reject=%s", \ 276 str, addr, response); \ 277 LogUsrErrs = false; \ 278 } \ 279 usrerr(response); \ 280 MILTER_SHUTDOWN \ 281 break; \ 282 \ 283 case SMFIR_REJECT: \ 284 if (MilterLogLevel > 3) \ 285 { \ 286 sm_syslog(LOG_INFO, e->e_id, \ 287 "Milter: %s=%s, reject=550 5.7.1 Command rejected", \ 288 str, addr); \ 289 LogUsrErrs = false; \ 290 } \ 291 usrerr("550 5.7.1 Command rejected"); \ 292 break; \ 293 \ 294 case SMFIR_DISCARD: \ 295 if (MilterLogLevel > 3) \ 296 sm_syslog(LOG_INFO, e->e_id, \ 297 "Milter: %s=%s, discard", \ 298 str, addr); \ 299 e->e_flags |= EF_DISCARD; \ 300 break; \ 301 \ 302 case SMFIR_TEMPFAIL: \ 303 if (MilterLogLevel > 3) \ 304 { \ 305 sm_syslog(LOG_INFO, e->e_id, \ 306 "Milter: %s=%s, reject=%s", \ 307 str, addr, MSG_TEMPFAIL); \ 308 LogUsrErrs = false; \ 309 } \ 310 usrerr(MSG_TEMPFAIL); \ 311 break; \ 312 } \ 313 LogUsrErrs = savelogusrerrs; \ 314 if (response != NULL) \ 315 sm_free(response); /* XXX */ \ 316 } 317 318 #else /* MILTER */ 319 # define MILTER_ABORT(e) 320 #endif /* MILTER */ 321 322 /* clear all SMTP state (for HELO/EHLO/RSET) */ 323 #define CLEAR_STATE(cmd) \ 324 { \ 325 /* abort milter filters */ \ 326 MILTER_ABORT(e); \ 327 \ 328 if (smtp.sm_nrcpts > 0) \ 329 { \ 330 logundelrcpts(e, cmd, 10, false); \ 331 smtp.sm_nrcpts = 0; \ 332 macdefine(&e->e_macro, A_PERM, \ 333 macid("{nrcpts}"), "0"); \ 334 } \ 335 \ 336 e->e_sendqueue = NULL; \ 337 e->e_flags |= EF_CLRQUEUE; \ 338 \ 339 if (LogLevel > 4 && bitset(EF_LOGSENDER, e->e_flags)) \ 340 logsender(e, NULL); \ 341 e->e_flags &= ~EF_LOGSENDER; \ 342 \ 343 /* clean up a bit */ \ 344 smtp.sm_gotmail = false; \ 345 SuprErrs = true; \ 346 dropenvelope(e, true, false); \ 347 sm_rpool_free(e->e_rpool); \ 348 e = newenvelope(e, CurEnv, sm_rpool_new_x(NULL)); \ 349 CurEnv = e; \ 350 } 351 352 /* sleep to flatten out connection load */ 353 #define MIN_DELAY_LOG 15 /* wait before logging this again */ 354 355 /* is it worth setting the process title for 1s? */ 356 #define DELAY_CONN(cmd) \ 357 if (DelayLA > 0 && (CurrentLA = getla()) >= DelayLA) \ 358 { \ 359 time_t dnow; \ 360 \ 361 sm_setproctitle(true, e, \ 362 "%s: %s: delaying %s: load average: %d", \ 363 qid_printname(e), CurSmtpClient, \ 364 cmd, DelayLA); \ 365 if (LogLevel > 8 && (dnow = curtime()) > log_delay) \ 366 { \ 367 sm_syslog(LOG_INFO, e->e_id, \ 368 "delaying=%s, load average=%d >= %d", \ 369 cmd, CurrentLA, DelayLA); \ 370 log_delay = dnow + MIN_DELAY_LOG; \ 371 } \ 372 (void) sleep(1); \ 373 sm_setproctitle(true, e, "%s %s: %.80s", \ 374 qid_printname(e), CurSmtpClient, inp); \ 375 } 376 377 378 void 379 smtp(nullserver, d_flags, e) 380 char *volatile nullserver; 381 BITMAP256 d_flags; 382 register ENVELOPE *volatile e; 383 { 384 register char *volatile p; 385 register struct cmd *volatile c = NULL; 386 char *cmd; 387 auto ADDRESS *vrfyqueue; 388 ADDRESS *a; 389 volatile bool gothello; /* helo command received */ 390 bool vrfy; /* set if this is a vrfy command */ 391 char *volatile protocol; /* sending protocol */ 392 char *volatile sendinghost; /* sending hostname */ 393 char *volatile peerhostname; /* name of SMTP peer or "localhost" */ 394 auto char *delimptr; 395 char *id; 396 volatile unsigned int n_badcmds = 0; /* count of bad commands */ 397 volatile unsigned int n_badrcpts = 0; /* number of rejected RCPT */ 398 volatile unsigned int n_verifies = 0; /* count of VRFY/EXPN */ 399 volatile unsigned int n_etrn = 0; /* count of ETRN */ 400 volatile unsigned int n_noop = 0; /* count of NOOP/VERB/etc */ 401 volatile unsigned int n_helo = 0; /* count of HELO/EHLO */ 402 volatile int save_sevenbitinput; 403 bool ok; 404 #if _FFR_BLOCK_PROXIES || _FFR_ADAPTIVE_EOL 405 volatile bool first; 406 #endif /* _FFR_BLOCK_PROXIES || _FFR_ADAPTIVE_EOL */ 407 volatile bool tempfail = false; 408 volatile time_t wt; /* timeout after too many commands */ 409 volatile time_t previous; /* time after checksmtpattack() */ 410 volatile bool lognullconnection = true; 411 register char *q; 412 SMTP_T smtp; 413 char *addr; 414 char *greetcode = "220"; 415 char *hostname; /* my hostname ($j) */ 416 QUEUE_CHAR *new; 417 int argno; 418 char *args[MAXSMTPARGS]; 419 char inp[MAXLINE]; 420 char cmdbuf[MAXLINE]; 421 #if SASL 422 sasl_conn_t *conn; 423 volatile bool sasl_ok; 424 volatile unsigned int n_auth = 0; /* count of AUTH commands */ 425 bool ismore; 426 int result; 427 volatile int authenticating; 428 char *user; 429 char *in, *out2; 430 # if SASL >= 20000 431 char *auth_id; 432 const char *out; 433 sasl_ssf_t ext_ssf; 434 char localip[60], remoteip[60]; 435 # else /* SASL >= 20000 */ 436 char *out; 437 const char *errstr; 438 sasl_external_properties_t ext_ssf; 439 struct sockaddr_in saddr_l; 440 struct sockaddr_in saddr_r; 441 # endif /* SASL >= 20000 */ 442 sasl_security_properties_t ssp; 443 sasl_ssf_t *ssf; 444 unsigned int inlen, out2len; 445 unsigned int outlen; 446 char *volatile auth_type; 447 char *mechlist; 448 volatile unsigned int n_mechs; 449 unsigned int len; 450 #endif /* SASL */ 451 #if STARTTLS 452 int r; 453 int rfd, wfd; 454 volatile bool tls_active = false; 455 # if _FFR_SMTP_SSL 456 volatile bool smtps = false; 457 # endif /* _FFR_SMTP_SSL */ 458 bool saveQuickAbort; 459 bool saveSuprErrs; 460 time_t tlsstart; 461 #endif /* STARTTLS */ 462 volatile unsigned int features; 463 #if PIPELINING 464 # if _FFR_NO_PIPE 465 int np_log = 0; 466 # endif /* _FFR_NO_PIPE */ 467 #endif /* PIPELINING */ 468 volatile time_t log_delay = (time_t) 0; 469 470 save_sevenbitinput = SevenBitInput; 471 smtp.sm_nrcpts = 0; 472 #if MILTER 473 smtp.sm_milterize = (nullserver == NULL); 474 smtp.sm_milterlist = false; 475 #endif /* MILTER */ 476 477 /* setup I/O fd correctly for the SMTP server */ 478 setup_smtpd_io(); 479 480 #if SM_HEAP_CHECK 481 if (sm_debug_active(&DebugLeakSmtp, 1)) 482 { 483 sm_heap_newgroup(); 484 sm_dprintf("smtp() heap group #%d\n", sm_heap_group()); 485 } 486 #endif /* SM_HEAP_CHECK */ 487 488 /* XXX the rpool should be set when e is initialized in main() */ 489 e->e_rpool = sm_rpool_new_x(NULL); 490 e->e_macro.mac_rpool = e->e_rpool; 491 492 settime(e); 493 sm_getla(); 494 peerhostname = RealHostName; 495 if (peerhostname == NULL) 496 peerhostname = "localhost"; 497 CurHostName = peerhostname; 498 CurSmtpClient = macvalue('_', e); 499 if (CurSmtpClient == NULL) 500 CurSmtpClient = CurHostName; 501 502 /* check_relay may have set discard bit, save for later */ 503 smtp.sm_discard = bitset(EF_DISCARD, e->e_flags); 504 505 #if PIPELINING 506 /* auto-flush output when reading input */ 507 (void) sm_io_autoflush(InChannel, OutChannel); 508 #endif /* PIPELINING */ 509 510 sm_setproctitle(true, e, "server %s startup", CurSmtpClient); 511 512 /* Set default features for server. */ 513 features = ((bitset(PRIV_NOETRN, PrivacyFlags) || 514 bitnset(D_NOETRN, d_flags)) ? SRV_NONE : SRV_OFFER_ETRN) 515 | (bitnset(D_AUTHREQ, d_flags) ? SRV_REQ_AUTH : SRV_NONE) 516 | (bitset(PRIV_NOEXPN, PrivacyFlags) ? SRV_NONE 517 : (SRV_OFFER_EXPN 518 | (bitset(PRIV_NOVERB, PrivacyFlags) 519 ? SRV_NONE : SRV_OFFER_VERB))) 520 | (bitset(PRIV_NORECEIPTS, PrivacyFlags) ? SRV_NONE 521 : SRV_OFFER_DSN) 522 #if SASL 523 | (bitnset(D_NOAUTH, d_flags) ? SRV_NONE : SRV_OFFER_AUTH) 524 #endif /* SASL */ 525 #if PIPELINING 526 | SRV_OFFER_PIPE 527 #endif /* PIPELINING */ 528 #if STARTTLS 529 | (bitnset(D_NOTLS, d_flags) ? SRV_NONE : SRV_OFFER_TLS) 530 | (bitset(TLS_I_NO_VRFY, TLS_Srv_Opts) ? SRV_NONE 531 : SRV_VRFY_CLT) 532 #endif /* STARTTLS */ 533 ; 534 if (nullserver == NULL) 535 { 536 features = srvfeatures(e, CurSmtpClient, features); 537 if (bitset(SRV_TMP_FAIL, features)) 538 { 539 if (LogLevel > 4) 540 sm_syslog(LOG_ERR, NOQID, 541 "ERROR: srv_features=tempfail, relay=%.100s, access temporarily disabled", 542 CurSmtpClient); 543 nullserver = "450 4.3.0 Please try again later."; 544 } 545 #if PIPELINING 546 # if _FFR_NO_PIPE 547 else if (bitset(SRV_NO_PIPE, features)) 548 { 549 /* for consistency */ 550 features &= ~SRV_OFFER_PIPE; 551 } 552 # endif /* _FFR_NO_PIPE */ 553 #endif /* PIPELINING */ 554 } 555 556 hostname = macvalue('j', e); 557 #if SASL 558 sasl_ok = bitset(SRV_OFFER_AUTH, features); 559 n_mechs = 0; 560 authenticating = SASL_NOT_AUTH; 561 562 /* SASL server new connection */ 563 if (sasl_ok) 564 { 565 # if SASL >= 20000 566 result = sasl_server_new("smtp", hostname, NULL, NULL, NULL, 567 NULL, 0, &conn); 568 # elif SASL > 10505 569 /* use empty realm: only works in SASL > 1.5.5 */ 570 result = sasl_server_new("smtp", hostname, "", NULL, 0, &conn); 571 # else /* SASL >= 20000 */ 572 /* use no realm -> realm is set to hostname by SASL lib */ 573 result = sasl_server_new("smtp", hostname, NULL, NULL, 0, 574 &conn); 575 # endif /* SASL >= 20000 */ 576 sasl_ok = result == SASL_OK; 577 if (!sasl_ok) 578 { 579 if (LogLevel > 9) 580 sm_syslog(LOG_WARNING, NOQID, 581 "AUTH error: sasl_server_new failed=%d", 582 result); 583 } 584 } 585 if (sasl_ok) 586 { 587 /* 588 ** SASL set properties for sasl 589 ** set local/remote IP 590 ** XXX Cyrus SASL v1 only supports IPv4 591 ** 592 ** XXX where exactly are these used/required? 593 ** Kerberos_v4 594 */ 595 596 # if SASL >= 20000 597 # if NETINET || NETINET6 598 in = macvalue(macid("{daemon_family}"), e); 599 if (in != NULL && ( 600 # if NETINET6 601 strcmp(in, "inet6") == 0 || 602 # endif /* NETINET6 */ 603 strcmp(in, "inet") == 0)) 604 { 605 SOCKADDR_LEN_T addrsize; 606 SOCKADDR saddr_l; 607 SOCKADDR saddr_r; 608 609 addrsize = sizeof(saddr_r); 610 if (getpeername(sm_io_getinfo(InChannel, SM_IO_WHAT_FD, 611 NULL), 612 (struct sockaddr *) &saddr_r, 613 &addrsize) == 0) 614 { 615 if (iptostring(&saddr_r, addrsize, 616 remoteip, sizeof remoteip)) 617 { 618 sasl_setprop(conn, SASL_IPREMOTEPORT, 619 remoteip); 620 } 621 addrsize = sizeof(saddr_l); 622 if (getsockname(sm_io_getinfo(InChannel, 623 SM_IO_WHAT_FD, 624 NULL), 625 (struct sockaddr *) &saddr_l, 626 &addrsize) == 0) 627 { 628 if (iptostring(&saddr_l, addrsize, 629 localip, 630 sizeof localip)) 631 { 632 sasl_setprop(conn, 633 SASL_IPLOCALPORT, 634 localip); 635 } 636 } 637 } 638 } 639 # endif /* NETINET || NETINET6 */ 640 # else /* SASL >= 20000 */ 641 # if NETINET 642 in = macvalue(macid("{daemon_family}"), e); 643 if (in != NULL && strcmp(in, "inet") == 0) 644 { 645 SOCKADDR_LEN_T addrsize; 646 647 addrsize = sizeof(struct sockaddr_in); 648 if (getpeername(sm_io_getinfo(InChannel, SM_IO_WHAT_FD, 649 NULL), 650 (struct sockaddr *)&saddr_r, 651 &addrsize) == 0) 652 { 653 sasl_setprop(conn, SASL_IP_REMOTE, &saddr_r); 654 addrsize = sizeof(struct sockaddr_in); 655 if (getsockname(sm_io_getinfo(InChannel, 656 SM_IO_WHAT_FD, 657 NULL), 658 (struct sockaddr *)&saddr_l, 659 &addrsize) == 0) 660 sasl_setprop(conn, SASL_IP_LOCAL, 661 &saddr_l); 662 } 663 } 664 # endif /* NETINET */ 665 # endif /* SASL >= 20000 */ 666 667 auth_type = NULL; 668 mechlist = NULL; 669 user = NULL; 670 # if 0 671 macdefine(&BlankEnvelope.e_macro, A_PERM, 672 macid("{auth_author}"), NULL); 673 # endif /* 0 */ 674 675 /* set properties */ 676 (void) memset(&ssp, '\0', sizeof ssp); 677 678 /* XXX should these be options settable via .cf ? */ 679 /* ssp.min_ssf = 0; is default due to memset() */ 680 # if STARTTLS 681 # endif /* STARTTLS */ 682 { 683 ssp.max_ssf = MaxSLBits; 684 ssp.maxbufsize = MAXOUTLEN; 685 } 686 ssp.security_flags = SASLOpts & SASL_SEC_MASK; 687 sasl_ok = sasl_setprop(conn, SASL_SEC_PROPS, &ssp) == SASL_OK; 688 689 if (sasl_ok) 690 { 691 /* 692 ** external security strength factor; 693 ** currently we have none so zero 694 */ 695 696 # if SASL >= 20000 697 ext_ssf = 0; 698 auth_id = NULL; 699 sasl_ok = ((sasl_setprop(conn, SASL_SSF_EXTERNAL, 700 &ext_ssf) == SASL_OK) && 701 (sasl_setprop(conn, SASL_AUTH_EXTERNAL, 702 auth_id) == SASL_OK)); 703 # else /* SASL >= 20000 */ 704 ext_ssf.ssf = 0; 705 ext_ssf.auth_id = NULL; 706 sasl_ok = sasl_setprop(conn, SASL_SSF_EXTERNAL, 707 &ext_ssf) == SASL_OK; 708 # endif /* SASL >= 20000 */ 709 } 710 if (sasl_ok) 711 n_mechs = saslmechs(conn, &mechlist); 712 } 713 #endif /* SASL */ 714 715 #if STARTTLS 716 #endif /* STARTTLS */ 717 718 #if MILTER 719 if (smtp.sm_milterize) 720 { 721 char state; 722 723 /* initialize mail filter connection */ 724 smtp.sm_milterlist = milter_init(e, &state); 725 switch (state) 726 { 727 case SMFIR_REJECT: 728 if (MilterLogLevel > 3) 729 sm_syslog(LOG_INFO, e->e_id, 730 "Milter: initialization failed, rejecting commands"); 731 greetcode = "554"; 732 nullserver = "Command rejected"; 733 smtp.sm_milterize = false; 734 break; 735 736 case SMFIR_TEMPFAIL: 737 if (MilterLogLevel > 3) 738 sm_syslog(LOG_INFO, e->e_id, 739 "Milter: initialization failed, temp failing commands"); 740 tempfail = true; 741 smtp.sm_milterize = false; 742 break; 743 } 744 } 745 746 if (smtp.sm_milterlist && smtp.sm_milterize && 747 !bitset(EF_DISCARD, e->e_flags)) 748 { 749 char state; 750 char *response; 751 752 response = milter_connect(peerhostname, RealHostAddr, 753 e, &state); 754 switch (state) 755 { 756 case SMFIR_REPLYCODE: /* REPLYCODE shouldn't happen */ 757 case SMFIR_REJECT: 758 if (MilterLogLevel > 3) 759 sm_syslog(LOG_INFO, e->e_id, 760 "Milter: connect: host=%s, addr=%s, rejecting commands", 761 peerhostname, 762 anynet_ntoa(&RealHostAddr)); 763 greetcode = "554"; 764 nullserver = "Command rejected"; 765 smtp.sm_milterize = false; 766 break; 767 768 case SMFIR_TEMPFAIL: 769 if (MilterLogLevel > 3) 770 sm_syslog(LOG_INFO, e->e_id, 771 "Milter: connect: host=%s, addr=%s, temp failing commands", 772 peerhostname, 773 anynet_ntoa(&RealHostAddr)); 774 tempfail = true; 775 smtp.sm_milterize = false; 776 break; 777 778 #if _FFR_MILTER_421 779 case SMFIR_SHUTDOWN: 780 if (MilterLogLevel > 3) 781 sm_syslog(LOG_INFO, e->e_id, 782 "Milter: connect: host=%s, addr=%s, shutdown", 783 peerhostname, 784 anynet_ntoa(&RealHostAddr)); 785 tempfail = true; 786 smtp.sm_milterize = false; 787 message("421 4.7.0 %s closing connection", 788 MyHostName); 789 790 /* arrange to ignore send list */ 791 e->e_sendqueue = NULL; 792 goto doquit; 793 #endif /* _FFR_MILTER_421 */ 794 } 795 if (response != NULL) 796 797 sm_free(response); /* XXX */ 798 } 799 #endif /* MILTER */ 800 801 #if STARTTLS 802 # if _FFR_SMTP_SSL 803 /* If this an smtps connection, start TLS now */ 804 smtps = bitnset(D_SMTPS, d_flags); 805 if (smtps) 806 { 807 Errors = 0; 808 goto starttls; 809 } 810 811 greeting: 812 813 # endif /* _FFR_SMTP_SSL */ 814 #endif /* STARTTLS */ 815 816 /* output the first line, inserting "ESMTP" as second word */ 817 if (*greetcode == '5') 818 (void) sm_snprintf(inp, sizeof inp, "%s not accepting messages", 819 hostname); 820 else 821 expand(SmtpGreeting, inp, sizeof inp, e); 822 823 p = strchr(inp, '\n'); 824 if (p != NULL) 825 *p++ = '\0'; 826 id = strchr(inp, ' '); 827 if (id == NULL) 828 id = &inp[strlen(inp)]; 829 if (p == NULL) 830 (void) sm_snprintf(cmdbuf, sizeof cmdbuf, 831 "%s %%.*s ESMTP%%s", greetcode); 832 else 833 (void) sm_snprintf(cmdbuf, sizeof cmdbuf, 834 "%s-%%.*s ESMTP%%s", greetcode); 835 message(cmdbuf, (int) (id - inp), inp, id); 836 837 /* output remaining lines */ 838 while ((id = p) != NULL && (p = strchr(id, '\n')) != NULL) 839 { 840 *p++ = '\0'; 841 if (isascii(*id) && isspace(*id)) 842 id++; 843 (void) sm_strlcpyn(cmdbuf, sizeof cmdbuf, 2, greetcode, "-%s"); 844 message(cmdbuf, id); 845 } 846 if (id != NULL) 847 { 848 if (isascii(*id) && isspace(*id)) 849 id++; 850 (void) sm_strlcpyn(cmdbuf, sizeof cmdbuf, 2, greetcode, " %s"); 851 message(cmdbuf, id); 852 } 853 854 protocol = NULL; 855 sendinghost = macvalue('s', e); 856 857 #if _FFR_QUARANTINE 858 /* If quarantining by a connect/ehlo action, save between messages */ 859 if (e->e_quarmsg == NULL) 860 smtp.sm_quarmsg = NULL; 861 else 862 smtp.sm_quarmsg = newstr(e->e_quarmsg); 863 #endif /* _FFR_QUARANTINE */ 864 865 /* sendinghost's storage must outlive the current envelope */ 866 if (sendinghost != NULL) 867 sendinghost = sm_strdup_x(sendinghost); 868 #if _FFR_BLOCK_PROXIES || _FFR_ADAPTIVE_EOL 869 first = true; 870 #endif /* _FFR_BLOCK_PROXIES || _FFR_ADAPTIVE_EOL */ 871 gothello = false; 872 smtp.sm_gotmail = false; 873 for (;;) 874 { 875 SM_TRY 876 { 877 QuickAbort = false; 878 HoldErrs = false; 879 SuprErrs = false; 880 LogUsrErrs = false; 881 OnlyOneError = true; 882 e->e_flags &= ~(EF_VRFYONLY|EF_GLOBALERRS); 883 884 /* setup for the read */ 885 e->e_to = NULL; 886 Errors = 0; 887 FileName = NULL; 888 (void) sm_io_flush(smioout, SM_TIME_DEFAULT); 889 890 /* read the input line */ 891 SmtpPhase = "server cmd read"; 892 sm_setproctitle(true, e, "server %s cmd read", CurSmtpClient); 893 #if SASL 894 /* 895 ** XXX SMTP AUTH requires accepting any length, 896 ** at least for challenge/response 897 */ 898 #endif /* SASL */ 899 900 /* handle errors */ 901 if (sm_io_error(OutChannel) || 902 (p = sfgets(inp, sizeof inp, InChannel, 903 TimeOuts.to_nextcommand, SmtpPhase)) == NULL) 904 { 905 char *d; 906 907 d = macvalue(macid("{daemon_name}"), e); 908 if (d == NULL) 909 d = "stdin"; 910 /* end of file, just die */ 911 disconnect(1, e); 912 913 #if MILTER 914 /* close out milter filters */ 915 milter_quit(e); 916 #endif /* MILTER */ 917 918 message("421 4.4.1 %s Lost input channel from %s", 919 MyHostName, CurSmtpClient); 920 if (LogLevel > (smtp.sm_gotmail ? 1 : 19)) 921 sm_syslog(LOG_NOTICE, e->e_id, 922 "lost input channel from %s to %s after %s", 923 CurSmtpClient, d, 924 (c == NULL || c->cmd_name == NULL) ? "startup" : c->cmd_name); 925 /* 926 ** If have not accepted mail (DATA), do not bounce 927 ** bad addresses back to sender. 928 */ 929 930 if (bitset(EF_CLRQUEUE, e->e_flags)) 931 e->e_sendqueue = NULL; 932 goto doquit; 933 } 934 935 #if _FFR_BLOCK_PROXIES || _FFR_ADAPTIVE_EOL 936 if (first) 937 { 938 #if _FFR_BLOCK_PROXIES 939 size_t inplen, cmdlen; 940 int idx; 941 char *http_cmd; 942 static char *http_cmds[] = { "GET", "POST", 943 "CONNECT", "USER", NULL }; 944 945 inplen = strlen(inp); 946 for (idx = 0; (http_cmd = http_cmds[idx]) != NULL; 947 idx++) 948 { 949 cmdlen = strlen(http_cmd); 950 if (cmdlen < inplen && 951 sm_strncasecmp(inp, http_cmd, cmdlen) == 0 && 952 isascii(inp[cmdlen]) && isspace(inp[cmdlen])) 953 { 954 /* Open proxy, drop it */ 955 message("421 4.7.0 %s Rejecting open proxy %s", 956 MyHostName, CurSmtpClient); 957 sm_syslog(LOG_INFO, e->e_id, 958 "%s: probable open proxy: command=%.40s", 959 CurSmtpClient, inp); 960 goto doquit; 961 } 962 } 963 #endif /* _FFR_BLOCK_PROXIES */ 964 #if _FFR_ADAPTIVE_EOL 965 char *p; 966 967 smtp.sm_crlf = true; 968 p = strchr(inp, '\n'); 969 if (p == NULL || p <= inp || p[-1] != '\r') 970 { 971 smtp.sm_crlf = false; 972 if (tTd(66, 1) && LogLevel > 8) 973 { 974 /* how many bad guys are there? */ 975 sm_syslog(LOG_INFO, NOQID, 976 "%s did not use CRLF", 977 CurSmtpClient); 978 } 979 } 980 #endif /* _FFR_ADAPTIVE_EOL */ 981 first = false; 982 } 983 #endif /* _FFR_BLOCK_PROXIES || _FFR_ADAPTIVE_EOL */ 984 985 /* clean up end of line */ 986 fixcrlf(inp, true); 987 988 #if PIPELINING 989 # if _FFR_NO_PIPE 990 /* 991 ** if there is more input and pipelining is disabled: 992 ** delay ... (and maybe discard the input?) 993 ** XXX this doesn't really work, at least in tests using 994 ** telnet SM_IO_IS_READABLE only returns 1 if there were 995 ** more than 2 input lines available. 996 */ 997 998 if (bitset(SRV_NO_PIPE, features) && 999 sm_io_getinfo(InChannel, SM_IO_IS_READABLE, NULL) > 0) 1000 { 1001 if (++np_log < 3) 1002 sm_syslog(LOG_INFO, NOQID, 1003 "unauthorized PIPELINING, sleeping"); 1004 sleep(1); 1005 } 1006 1007 # endif /* _FFR_NO_PIPE */ 1008 #endif /* PIPELINING */ 1009 1010 #if SASL 1011 if (authenticating == SASL_PROC_AUTH) 1012 { 1013 # if 0 1014 if (*inp == '\0') 1015 { 1016 authenticating = SASL_NOT_AUTH; 1017 message("501 5.5.2 missing input"); 1018 RESET_SASLCONN; 1019 continue; 1020 } 1021 # endif /* 0 */ 1022 if (*inp == '*' && *(inp + 1) == '\0') 1023 { 1024 authenticating = SASL_NOT_AUTH; 1025 1026 /* rfc 2254 4. */ 1027 message("501 5.0.0 AUTH aborted"); 1028 RESET_SASLCONN; 1029 continue; 1030 } 1031 1032 /* could this be shorter? XXX */ 1033 # if SASL >= 20000 1034 in = xalloc(strlen(inp) + 1); 1035 result = sasl_decode64(inp, strlen(inp), in, 1036 strlen(inp), &inlen); 1037 # else /* SASL >= 20000 */ 1038 out = xalloc(strlen(inp)); 1039 result = sasl_decode64(inp, strlen(inp), out, &outlen); 1040 # endif /* SASL >= 20000 */ 1041 if (result != SASL_OK) 1042 { 1043 authenticating = SASL_NOT_AUTH; 1044 1045 /* rfc 2254 4. */ 1046 message("501 5.5.4 cannot decode AUTH parameter %s", 1047 inp); 1048 # if SASL >= 20000 1049 sm_free(in); 1050 # endif /* SASL >= 20000 */ 1051 RESET_SASLCONN; 1052 continue; 1053 } 1054 1055 # if SASL >= 20000 1056 result = sasl_server_step(conn, in, inlen, 1057 &out, &outlen); 1058 sm_free(in); 1059 # else /* SASL >= 20000 */ 1060 result = sasl_server_step(conn, out, outlen, 1061 &out, &outlen, &errstr); 1062 # endif /* SASL >= 20000 */ 1063 1064 /* get an OK if we're done */ 1065 if (result == SASL_OK) 1066 { 1067 authenticated: 1068 message("235 2.0.0 OK Authenticated"); 1069 authenticating = SASL_IS_AUTH; 1070 macdefine(&BlankEnvelope.e_macro, A_TEMP, 1071 macid("{auth_type}"), auth_type); 1072 1073 # if SASL >= 20000 1074 user = macvalue(macid("{auth_authen}"), e); 1075 1076 /* get security strength (features) */ 1077 result = sasl_getprop(conn, SASL_SSF, 1078 (const void **) &ssf); 1079 # else /* SASL >= 20000 */ 1080 result = sasl_getprop(conn, SASL_USERNAME, 1081 (void **)&user); 1082 if (result != SASL_OK) 1083 { 1084 user = ""; 1085 macdefine(&BlankEnvelope.e_macro, 1086 A_PERM, 1087 macid("{auth_authen}"), NULL); 1088 } 1089 else 1090 { 1091 macdefine(&BlankEnvelope.e_macro, 1092 A_TEMP, 1093 macid("{auth_authen}"), user); 1094 } 1095 1096 # if 0 1097 /* get realm? */ 1098 sasl_getprop(conn, SASL_REALM, (void **) &data); 1099 # endif /* 0 */ 1100 1101 /* get security strength (features) */ 1102 result = sasl_getprop(conn, SASL_SSF, 1103 (void **) &ssf); 1104 # endif /* SASL >= 20000 */ 1105 if (result != SASL_OK) 1106 { 1107 macdefine(&BlankEnvelope.e_macro, 1108 A_PERM, 1109 macid("{auth_ssf}"), "0"); 1110 ssf = NULL; 1111 } 1112 else 1113 { 1114 char pbuf[8]; 1115 1116 (void) sm_snprintf(pbuf, sizeof pbuf, 1117 "%u", *ssf); 1118 macdefine(&BlankEnvelope.e_macro, 1119 A_TEMP, 1120 macid("{auth_ssf}"), pbuf); 1121 if (tTd(95, 8)) 1122 sm_dprintf("AUTH auth_ssf: %u\n", 1123 *ssf); 1124 } 1125 1126 /* 1127 ** Only switch to encrypted connection 1128 ** if a security layer has been negotiated 1129 */ 1130 1131 if (ssf != NULL && *ssf > 0) 1132 { 1133 /* 1134 ** Convert I/O layer to use SASL. 1135 ** If the call fails, the connection 1136 ** is aborted. 1137 */ 1138 1139 if (sfdcsasl(&InChannel, &OutChannel, 1140 conn) == 0) 1141 { 1142 /* restart dialogue */ 1143 n_helo = 0; 1144 # if PIPELINING 1145 (void) sm_io_autoflush(InChannel, 1146 OutChannel); 1147 # endif /* PIPELINING */ 1148 } 1149 else 1150 syserr("503 5.3.3 SASL TLS failed"); 1151 } 1152 1153 /* NULL pointer ok since it's our function */ 1154 if (LogLevel > 8) 1155 sm_syslog(LOG_INFO, NOQID, 1156 "AUTH=server, relay=%s, authid=%.128s, mech=%.16s, bits=%d", 1157 CurSmtpClient, 1158 shortenstring(user, 128), 1159 auth_type, *ssf); 1160 } 1161 else if (result == SASL_CONTINUE) 1162 { 1163 len = ENC64LEN(outlen); 1164 out2 = xalloc(len); 1165 result = sasl_encode64(out, outlen, out2, len, 1166 &out2len); 1167 if (result != SASL_OK) 1168 { 1169 /* correct code? XXX */ 1170 /* 454 Temp. authentication failure */ 1171 message("454 4.5.4 Internal error: unable to encode64"); 1172 if (LogLevel > 5) 1173 sm_syslog(LOG_WARNING, e->e_id, 1174 "AUTH encode64 error [%d for \"%s\"]", 1175 result, out); 1176 /* start over? */ 1177 authenticating = SASL_NOT_AUTH; 1178 } 1179 else 1180 { 1181 message("334 %s", out2); 1182 if (tTd(95, 2)) 1183 sm_dprintf("AUTH continue: msg='%s' len=%u\n", 1184 out2, out2len); 1185 } 1186 # if SASL >= 20000 1187 sm_free(out2); 1188 # endif /* SASL >= 20000 */ 1189 } 1190 else 1191 { 1192 /* not SASL_OK or SASL_CONT */ 1193 message("535 5.7.0 authentication failed"); 1194 if (LogLevel > 9) 1195 sm_syslog(LOG_WARNING, e->e_id, 1196 "AUTH failure (%s): %s (%d) %s", 1197 auth_type, 1198 sasl_errstring(result, NULL, 1199 NULL), 1200 result, 1201 # if SASL >= 20000 1202 sasl_errdetail(conn)); 1203 # else /* SASL >= 20000 */ 1204 errstr == NULL ? "" : errstr); 1205 # endif /* SASL >= 20000 */ 1206 RESET_SASLCONN; 1207 authenticating = SASL_NOT_AUTH; 1208 } 1209 } 1210 else 1211 { 1212 /* don't want to do any of this if authenticating */ 1213 #endif /* SASL */ 1214 1215 /* echo command to transcript */ 1216 if (e->e_xfp != NULL) 1217 (void) sm_io_fprintf(e->e_xfp, SM_TIME_DEFAULT, 1218 "<<< %s\n", inp); 1219 1220 if (LogLevel > 14) 1221 sm_syslog(LOG_INFO, e->e_id, "<-- %s", inp); 1222 1223 /* break off command */ 1224 for (p = inp; isascii(*p) && isspace(*p); p++) 1225 continue; 1226 cmd = cmdbuf; 1227 while (*p != '\0' && 1228 !(isascii(*p) && isspace(*p)) && 1229 cmd < &cmdbuf[sizeof cmdbuf - 2]) 1230 *cmd++ = *p++; 1231 *cmd = '\0'; 1232 1233 /* throw away leading whitespace */ 1234 SKIP_SPACE(p); 1235 1236 /* decode command */ 1237 for (c = CmdTab; c->cmd_name != NULL; c++) 1238 { 1239 if (sm_strcasecmp(c->cmd_name, cmdbuf) == 0) 1240 break; 1241 } 1242 1243 /* reset errors */ 1244 errno = 0; 1245 1246 /* check whether a "non-null" command has been used */ 1247 switch (c->cmd_code) 1248 { 1249 #if SASL 1250 case CMDAUTH: 1251 /* avoid information leak; take first two words? */ 1252 q = "AUTH"; 1253 break; 1254 #endif /* SASL */ 1255 1256 case CMDMAIL: 1257 case CMDEXPN: 1258 case CMDVRFY: 1259 case CMDETRN: 1260 lognullconnection = false; 1261 /* FALLTHROUGH */ 1262 default: 1263 q = inp; 1264 break; 1265 } 1266 1267 if (e->e_id == NULL) 1268 sm_setproctitle(true, e, "%s: %.80s", 1269 CurSmtpClient, q); 1270 else 1271 sm_setproctitle(true, e, "%s %s: %.80s", 1272 qid_printname(e), 1273 CurSmtpClient, q); 1274 1275 /* 1276 ** Process command. 1277 ** 1278 ** If we are running as a null server, return 550 1279 ** to almost everything. 1280 */ 1281 1282 if (nullserver != NULL || bitnset(D_ETRNONLY, d_flags)) 1283 { 1284 switch (c->cmd_code) 1285 { 1286 case CMDQUIT: 1287 case CMDHELO: 1288 case CMDEHLO: 1289 case CMDNOOP: 1290 case CMDRSET: 1291 /* process normally */ 1292 break; 1293 1294 case CMDETRN: 1295 if (bitnset(D_ETRNONLY, d_flags) && 1296 nullserver == NULL) 1297 break; 1298 DELAY_CONN("ETRN"); 1299 /* FALLTHROUGH */ 1300 1301 default: 1302 #if MAXBADCOMMANDS > 0 1303 /* theoretically this could overflow */ 1304 if (nullserver != NULL && 1305 ++n_badcmds > MAXBADCOMMANDS) 1306 { 1307 message("421 4.7.0 %s Too many bad commands; closing connection", 1308 MyHostName); 1309 1310 /* arrange to ignore send list */ 1311 e->e_sendqueue = NULL; 1312 goto doquit; 1313 } 1314 #endif /* MAXBADCOMMANDS > 0 */ 1315 if (nullserver != NULL) 1316 { 1317 if (ISSMTPREPLY(nullserver)) 1318 usrerr(nullserver); 1319 else 1320 usrerr("550 5.0.0 %s", 1321 nullserver); 1322 } 1323 else 1324 usrerr("452 4.4.5 Insufficient disk space; try again later"); 1325 continue; 1326 } 1327 } 1328 1329 switch (c->cmd_code) 1330 { 1331 #if SASL 1332 case CMDAUTH: /* sasl */ 1333 DELAY_CONN("AUTH"); 1334 if (!sasl_ok || n_mechs <= 0) 1335 { 1336 message("503 5.3.3 AUTH not available"); 1337 break; 1338 } 1339 if (authenticating == SASL_IS_AUTH) 1340 { 1341 message("503 5.5.0 Already Authenticated"); 1342 break; 1343 } 1344 if (smtp.sm_gotmail) 1345 { 1346 message("503 5.5.0 AUTH not permitted during a mail transaction"); 1347 break; 1348 } 1349 if (tempfail) 1350 { 1351 if (LogLevel > 9) 1352 sm_syslog(LOG_INFO, e->e_id, 1353 "SMTP AUTH command (%.100s) from %s tempfailed (due to previous checks)", 1354 p, CurSmtpClient); 1355 usrerr("454 4.7.1 Please try again later"); 1356 break; 1357 } 1358 1359 ismore = false; 1360 1361 /* crude way to avoid crack attempts */ 1362 (void) checksmtpattack(&n_auth, n_mechs + 1, true, 1363 "AUTH", e); 1364 1365 /* make sure mechanism (p) is a valid string */ 1366 for (q = p; *q != '\0' && isascii(*q); q++) 1367 { 1368 if (isspace(*q)) 1369 { 1370 *q = '\0'; 1371 while (*++q != '\0' && 1372 isascii(*q) && isspace(*q)) 1373 continue; 1374 *(q - 1) = '\0'; 1375 ismore = (*q != '\0'); 1376 break; 1377 } 1378 } 1379 1380 if (*p == '\0') 1381 { 1382 message("501 5.5.2 AUTH mechanism must be specified"); 1383 break; 1384 } 1385 1386 /* check whether mechanism is available */ 1387 if (iteminlist(p, mechlist, " ") == NULL) 1388 { 1389 message("504 5.3.3 AUTH mechanism %.32s not available", 1390 p); 1391 break; 1392 } 1393 1394 if (ismore) 1395 { 1396 /* could this be shorter? XXX */ 1397 # if SASL >= 20000 1398 in = xalloc(strlen(q) + 1); 1399 result = sasl_decode64(q, strlen(q), in, 1400 strlen(q), &inlen); 1401 # else /* SASL >= 20000 */ 1402 in = sm_rpool_malloc(e->e_rpool, strlen(q)); 1403 result = sasl_decode64(q, strlen(q), in, 1404 &inlen); 1405 # endif /* SASL >= 20000 */ 1406 if (result != SASL_OK) 1407 { 1408 message("501 5.5.4 cannot BASE64 decode '%s'", 1409 q); 1410 if (LogLevel > 5) 1411 sm_syslog(LOG_WARNING, e->e_id, 1412 "AUTH decode64 error [%d for \"%s\"]", 1413 result, q); 1414 /* start over? */ 1415 authenticating = SASL_NOT_AUTH; 1416 # if SASL >= 20000 1417 sm_free(in); 1418 # endif /* SASL >= 20000 */ 1419 in = NULL; 1420 inlen = 0; 1421 break; 1422 } 1423 } 1424 else 1425 { 1426 in = NULL; 1427 inlen = 0; 1428 } 1429 1430 /* see if that auth type exists */ 1431 # if SASL >= 20000 1432 result = sasl_server_start(conn, p, in, inlen, 1433 &out, &outlen); 1434 if (in != NULL) 1435 sm_free(in); 1436 # else /* SASL >= 20000 */ 1437 result = sasl_server_start(conn, p, in, inlen, 1438 &out, &outlen, &errstr); 1439 # endif /* SASL >= 20000 */ 1440 1441 if (result != SASL_OK && result != SASL_CONTINUE) 1442 { 1443 message("535 5.7.0 authentication failed"); 1444 if (LogLevel > 9) 1445 sm_syslog(LOG_ERR, e->e_id, 1446 "AUTH failure (%s): %s (%d) %s", 1447 p, 1448 sasl_errstring(result, NULL, 1449 NULL), 1450 result, 1451 # if SASL >= 20000 1452 sasl_errdetail(conn)); 1453 # else /* SASL >= 20000 */ 1454 errstr); 1455 # endif /* SASL >= 20000 */ 1456 RESET_SASLCONN; 1457 break; 1458 } 1459 auth_type = newstr(p); 1460 1461 if (result == SASL_OK) 1462 { 1463 /* ugly, but same code */ 1464 goto authenticated; 1465 /* authenticated by the initial response */ 1466 } 1467 1468 /* len is at least 2 */ 1469 len = ENC64LEN(outlen); 1470 out2 = xalloc(len); 1471 result = sasl_encode64(out, outlen, out2, len, 1472 &out2len); 1473 1474 if (result != SASL_OK) 1475 { 1476 message("454 4.5.4 Temporary authentication failure"); 1477 if (LogLevel > 5) 1478 sm_syslog(LOG_WARNING, e->e_id, 1479 "AUTH encode64 error [%d for \"%s\"]", 1480 result, out); 1481 1482 /* start over? */ 1483 authenticating = SASL_NOT_AUTH; 1484 RESET_SASLCONN; 1485 } 1486 else 1487 { 1488 message("334 %s", out2); 1489 authenticating = SASL_PROC_AUTH; 1490 } 1491 # if SASL >= 20000 1492 sm_free(out2); 1493 # endif /* SASL >= 20000 */ 1494 break; 1495 #endif /* SASL */ 1496 1497 #if STARTTLS 1498 case CMDSTLS: /* starttls */ 1499 DELAY_CONN("STARTTLS"); 1500 if (*p != '\0') 1501 { 1502 message("501 5.5.2 Syntax error (no parameters allowed)"); 1503 break; 1504 } 1505 if (!bitset(SRV_OFFER_TLS, features)) 1506 { 1507 message("503 5.5.0 TLS not available"); 1508 break; 1509 } 1510 if (!tls_ok_srv) 1511 { 1512 message("454 4.3.3 TLS not available after start"); 1513 break; 1514 } 1515 if (smtp.sm_gotmail) 1516 { 1517 message("503 5.5.0 TLS not permitted during a mail transaction"); 1518 break; 1519 } 1520 if (tempfail) 1521 { 1522 if (LogLevel > 9) 1523 sm_syslog(LOG_INFO, e->e_id, 1524 "SMTP STARTTLS command (%.100s) from %s tempfailed (due to previous checks)", 1525 p, CurSmtpClient); 1526 usrerr("454 4.7.1 Please try again later"); 1527 break; 1528 } 1529 # if _FFR_SMTP_SSL 1530 starttls: 1531 # endif /* _FFR_SMTP_SSL */ 1532 # if TLS_NO_RSA 1533 /* 1534 ** XXX do we need a temp key ? 1535 */ 1536 # else /* TLS_NO_RSA */ 1537 # endif /* TLS_NO_RSA */ 1538 1539 # if TLS_VRFY_PER_CTX 1540 /* 1541 ** Note: this sets the verification globally 1542 ** (per SSL_CTX) 1543 ** it's ok since it applies only to one transaction 1544 */ 1545 1546 TLS_VERIFY_CLIENT(); 1547 # endif /* TLS_VRFY_PER_CTX */ 1548 1549 if (srv_ssl != NULL) 1550 SSL_clear(srv_ssl); 1551 else if ((srv_ssl = SSL_new(srv_ctx)) == NULL) 1552 { 1553 message("454 4.3.3 TLS not available: error generating SSL handle"); 1554 if (LogLevel > 8) 1555 tlslogerr("server"); 1556 # if _FFR_SMTP_SSL 1557 goto tls_done; 1558 # else /* _FFR_SMTP_SSL */ 1559 break; 1560 # endif /* _FFR_SMTP_SSL */ 1561 } 1562 1563 # if !TLS_VRFY_PER_CTX 1564 /* 1565 ** this could be used if it were possible to set 1566 ** verification per SSL (connection) 1567 ** not just per SSL_CTX (global) 1568 */ 1569 1570 TLS_VERIFY_CLIENT(); 1571 # endif /* !TLS_VRFY_PER_CTX */ 1572 1573 rfd = sm_io_getinfo(InChannel, SM_IO_WHAT_FD, NULL); 1574 wfd = sm_io_getinfo(OutChannel, SM_IO_WHAT_FD, NULL); 1575 1576 if (rfd < 0 || wfd < 0 || 1577 SSL_set_rfd(srv_ssl, rfd) <= 0 || 1578 SSL_set_wfd(srv_ssl, wfd) <= 0) 1579 { 1580 message("454 4.3.3 TLS not available: error set fd"); 1581 SSL_free(srv_ssl); 1582 srv_ssl = NULL; 1583 # if _FFR_SMTP_SSL 1584 goto tls_done; 1585 # else /* _FFR_SMTP_SSL */ 1586 break; 1587 # endif /* _FFR_SMTP_SSL */ 1588 } 1589 # if _FFR_SMTP_SSL 1590 if (!smtps) 1591 # endif /* _FFR_SMTP_SSL */ 1592 message("220 2.0.0 Ready to start TLS"); 1593 # if PIPELINING 1594 (void) sm_io_flush(OutChannel, SM_TIME_DEFAULT); 1595 # endif /* PIPELINING */ 1596 1597 SSL_set_accept_state(srv_ssl); 1598 1599 # define SSL_ACC(s) SSL_accept(s) 1600 1601 tlsstart = curtime(); 1602 ssl_retry: 1603 if ((r = SSL_ACC(srv_ssl)) <= 0) 1604 { 1605 int i; 1606 bool timedout; 1607 time_t left; 1608 time_t now = curtime(); 1609 struct timeval tv; 1610 1611 /* what to do in this case? */ 1612 i = SSL_get_error(srv_ssl, r); 1613 1614 /* 1615 ** For SSL_ERROR_WANT_{READ,WRITE}: 1616 ** There is no SSL record available yet 1617 ** or there is only a partial SSL record 1618 ** removed from the network (socket) buffer 1619 ** into the SSL buffer. The SSL_accept will 1620 ** only succeed when a full SSL record is 1621 ** available (assuming a "real" error 1622 ** doesn't happen). To handle when a "real" 1623 ** error does happen the select is set for 1624 ** exceptions too. 1625 ** The connection may be re-negotiated 1626 ** during this time so both read and write 1627 ** "want errors" need to be handled. 1628 ** A select() exception loops back so that 1629 ** a proper SSL error message can be gotten. 1630 */ 1631 1632 left = TimeOuts.to_starttls - (now - tlsstart); 1633 timedout = left <= 0; 1634 if (!timedout) 1635 { 1636 tv.tv_sec = left; 1637 tv.tv_usec = 0; 1638 } 1639 1640 if (!timedout && FD_SETSIZE > 0 && 1641 (rfd >= FD_SETSIZE || 1642 (i == SSL_ERROR_WANT_WRITE && 1643 wfd >= FD_SETSIZE))) 1644 { 1645 if (LogLevel > 5) 1646 { 1647 sm_syslog(LOG_ERR, NOQID, 1648 "STARTTLS=server, error: fd %d/%d too large", 1649 rfd, wfd); 1650 if (LogLevel > 8) 1651 tlslogerr("server"); 1652 } 1653 goto tlsfail; 1654 } 1655 1656 /* XXX what about SSL_pending() ? */ 1657 if (!timedout && i == SSL_ERROR_WANT_READ) 1658 { 1659 fd_set ssl_maskr, ssl_maskx; 1660 1661 FD_ZERO(&ssl_maskr); 1662 FD_SET(rfd, &ssl_maskr); 1663 FD_ZERO(&ssl_maskx); 1664 FD_SET(rfd, &ssl_maskx); 1665 if (select(rfd + 1, &ssl_maskr, NULL, 1666 &ssl_maskx, &tv) > 0) 1667 goto ssl_retry; 1668 } 1669 if (!timedout && i == SSL_ERROR_WANT_WRITE) 1670 { 1671 fd_set ssl_maskw, ssl_maskx; 1672 1673 FD_ZERO(&ssl_maskw); 1674 FD_SET(wfd, &ssl_maskw); 1675 FD_ZERO(&ssl_maskx); 1676 FD_SET(rfd, &ssl_maskx); 1677 if (select(wfd + 1, NULL, &ssl_maskw, 1678 &ssl_maskx, &tv) > 0) 1679 goto ssl_retry; 1680 } 1681 if (LogLevel > 5) 1682 { 1683 sm_syslog(LOG_WARNING, NOQID, 1684 "STARTTLS=server, error: accept failed=%d, SSL_error=%d, timedout=%d, errno=%d", 1685 r, i, (int) timedout, errno); 1686 if (LogLevel > 8) 1687 tlslogerr("server"); 1688 } 1689 tlsfail: 1690 tls_ok_srv = false; 1691 SSL_free(srv_ssl); 1692 srv_ssl = NULL; 1693 1694 /* 1695 ** according to the next draft of 1696 ** RFC 2487 the connection should be dropped 1697 */ 1698 1699 /* arrange to ignore any current send list */ 1700 e->e_sendqueue = NULL; 1701 goto doquit; 1702 } 1703 1704 /* ignore return code for now, it's in {verify} */ 1705 (void) tls_get_info(srv_ssl, true, 1706 CurSmtpClient, 1707 &BlankEnvelope.e_macro, 1708 bitset(SRV_VRFY_CLT, features)); 1709 1710 /* 1711 ** call Stls_client to find out whether 1712 ** to accept the connection from the client 1713 */ 1714 1715 saveQuickAbort = QuickAbort; 1716 saveSuprErrs = SuprErrs; 1717 SuprErrs = true; 1718 QuickAbort = false; 1719 if (rscheck("tls_client", 1720 macvalue(macid("{verify}"), e), 1721 "STARTTLS", e, 1722 RSF_RMCOMM|RSF_COUNT, 1723 5, NULL, NOQID) != EX_OK || 1724 Errors > 0) 1725 { 1726 extern char MsgBuf[]; 1727 1728 if (MsgBuf[0] != '\0' && ISSMTPREPLY(MsgBuf)) 1729 nullserver = newstr(MsgBuf); 1730 else 1731 nullserver = "503 5.7.0 Authentication required."; 1732 } 1733 QuickAbort = saveQuickAbort; 1734 SuprErrs = saveSuprErrs; 1735 1736 tls_ok_srv = false; /* don't offer STARTTLS again */ 1737 n_helo = 0; 1738 # if SASL 1739 if (sasl_ok) 1740 { 1741 char *s; 1742 1743 s = macvalue(macid("{cipher_bits}"), e); 1744 # if SASL >= 20000 1745 if (s != NULL && (ext_ssf = atoi(s)) > 0) 1746 { 1747 auth_id = macvalue(macid("{cert_subject}"), 1748 e); 1749 sasl_ok = ((sasl_setprop(conn, SASL_SSF_EXTERNAL, 1750 &ext_ssf) == SASL_OK) && 1751 (sasl_setprop(conn, SASL_AUTH_EXTERNAL, 1752 auth_id) == SASL_OK)); 1753 # else /* SASL >= 20000 */ 1754 if (s != NULL && (ext_ssf.ssf = atoi(s)) > 0) 1755 { 1756 ext_ssf.auth_id = macvalue(macid("{cert_subject}"), 1757 e); 1758 sasl_ok = sasl_setprop(conn, SASL_SSF_EXTERNAL, 1759 &ext_ssf) == SASL_OK; 1760 # endif /* SASL >= 20000 */ 1761 mechlist = NULL; 1762 if (sasl_ok) 1763 n_mechs = saslmechs(conn, 1764 &mechlist); 1765 } 1766 } 1767 # endif /* SASL */ 1768 1769 /* switch to secure connection */ 1770 if (sfdctls(&InChannel, &OutChannel, srv_ssl) == 0) 1771 { 1772 tls_active = true; 1773 # if PIPELINING 1774 (void) sm_io_autoflush(InChannel, OutChannel); 1775 # endif /* PIPELINING */ 1776 } 1777 else 1778 { 1779 /* 1780 ** XXX this is an internal error 1781 ** how to deal with it? 1782 ** we can't generate an error message 1783 ** since the other side switched to an 1784 ** encrypted layer, but we could not... 1785 ** just "hang up"? 1786 */ 1787 1788 nullserver = "454 4.3.3 TLS not available: can't switch to encrypted layer"; 1789 syserr("STARTTLS: can't switch to encrypted layer"); 1790 } 1791 # if _FFR_SMTP_SSL 1792 tls_done: 1793 if (smtps) 1794 { 1795 if (tls_active) 1796 goto greeting; 1797 else 1798 goto doquit; 1799 } 1800 # endif /* _FFR_SMTP_SSL */ 1801 break; 1802 #endif /* STARTTLS */ 1803 1804 case CMDHELO: /* hello -- introduce yourself */ 1805 case CMDEHLO: /* extended hello */ 1806 DELAY_CONN("EHLO"); 1807 if (c->cmd_code == CMDEHLO) 1808 { 1809 protocol = "ESMTP"; 1810 SmtpPhase = "server EHLO"; 1811 } 1812 else 1813 { 1814 protocol = "SMTP"; 1815 SmtpPhase = "server HELO"; 1816 } 1817 1818 /* avoid denial-of-service */ 1819 (void) checksmtpattack(&n_helo, MAXHELOCOMMANDS, true, 1820 "HELO/EHLO", e); 1821 1822 #if 0 1823 /* RFC2821 4.1.4 allows duplicate HELO/EHLO */ 1824 /* check for duplicate HELO/EHLO per RFC 1651 4.2 */ 1825 if (gothello) 1826 { 1827 usrerr("503 %s Duplicate HELO/EHLO", 1828 MyHostName); 1829 break; 1830 } 1831 #endif /* 0 */ 1832 1833 /* check for valid domain name (re 1123 5.2.5) */ 1834 if (*p == '\0' && !AllowBogusHELO) 1835 { 1836 usrerr("501 %s requires domain address", 1837 cmdbuf); 1838 break; 1839 } 1840 1841 /* check for long domain name (hides Received: info) */ 1842 if (strlen(p) > MAXNAME) 1843 { 1844 usrerr("501 Invalid domain name"); 1845 if (LogLevel > 9) 1846 sm_syslog(LOG_INFO, CurEnv->e_id, 1847 "invalid domain name (too long) from %s", 1848 CurSmtpClient); 1849 break; 1850 } 1851 1852 ok = true; 1853 for (q = p; *q != '\0'; q++) 1854 { 1855 if (!isascii(*q)) 1856 break; 1857 if (isalnum(*q)) 1858 continue; 1859 if (isspace(*q)) 1860 { 1861 *q = '\0'; 1862 1863 /* only complain if strict check */ 1864 ok = AllowBogusHELO; 1865 break; 1866 } 1867 if (strchr("[].-_#:", *q) == NULL) 1868 break; 1869 } 1870 1871 if (*q == '\0' && ok) 1872 { 1873 q = "pleased to meet you"; 1874 sendinghost = sm_strdup_x(p); 1875 } 1876 else if (!AllowBogusHELO) 1877 { 1878 usrerr("501 Invalid domain name"); 1879 if (LogLevel > 9) 1880 sm_syslog(LOG_INFO, CurEnv->e_id, 1881 "invalid domain name (%s) from %.100s", 1882 p, CurSmtpClient); 1883 break; 1884 } 1885 else 1886 { 1887 q = "accepting invalid domain name"; 1888 } 1889 1890 if (gothello) 1891 { 1892 CLEAR_STATE(cmdbuf); 1893 1894 #if _FFR_QUARANTINE 1895 /* restore connection quarantining */ 1896 if (smtp.sm_quarmsg == NULL) 1897 { 1898 e->e_quarmsg = NULL; 1899 macdefine(&e->e_macro, A_PERM, 1900 macid("{quarantine}"), ""); 1901 } 1902 else 1903 { 1904 e->e_quarmsg = sm_rpool_strdup_x(e->e_rpool, 1905 smtp.sm_quarmsg); 1906 macdefine(&e->e_macro, A_PERM, 1907 macid("{quarantine}"), 1908 e->e_quarmsg); 1909 } 1910 #endif /* _FFR_QUARANTINE */ 1911 } 1912 1913 #if MILTER 1914 if (smtp.sm_milterlist && smtp.sm_milterize && 1915 !bitset(EF_DISCARD, e->e_flags)) 1916 { 1917 char state; 1918 char *response; 1919 1920 response = milter_helo(p, e, &state); 1921 switch (state) 1922 { 1923 case SMFIR_REPLYCODE: 1924 if (MilterLogLevel > 3) 1925 sm_syslog(LOG_INFO, e->e_id, 1926 "Milter: helo=%s, reject=%s", 1927 p, response); 1928 nullserver = newstr(response); 1929 smtp.sm_milterize = false; 1930 break; 1931 1932 case SMFIR_REJECT: 1933 if (MilterLogLevel > 3) 1934 sm_syslog(LOG_INFO, e->e_id, 1935 "Milter: helo=%s, reject=Command rejected", 1936 p); 1937 nullserver = "Command rejected"; 1938 smtp.sm_milterize = false; 1939 break; 1940 1941 case SMFIR_TEMPFAIL: 1942 if (MilterLogLevel > 3) 1943 sm_syslog(LOG_INFO, e->e_id, 1944 "Milter: helo=%s, reject=%s", 1945 p, MSG_TEMPFAIL); 1946 tempfail = true; 1947 smtp.sm_milterize = false; 1948 break; 1949 } 1950 if (response != NULL) 1951 sm_free(response); 1952 1953 # if _FFR_QUARANTINE 1954 /* 1955 ** If quarantining by a connect/ehlo action, 1956 ** save between messages 1957 */ 1958 1959 if (smtp.sm_quarmsg == NULL && 1960 e->e_quarmsg != NULL) 1961 smtp.sm_quarmsg = newstr(e->e_quarmsg); 1962 # endif /* _FFR_QUARANTINE */ 1963 } 1964 #endif /* MILTER */ 1965 gothello = true; 1966 1967 /* print HELO response message */ 1968 if (c->cmd_code != CMDEHLO) 1969 { 1970 message("250 %s Hello %s, %s", 1971 MyHostName, CurSmtpClient, q); 1972 break; 1973 } 1974 1975 message("250-%s Hello %s, %s", 1976 MyHostName, CurSmtpClient, q); 1977 1978 /* offer ENHSC even for nullserver */ 1979 if (nullserver != NULL) 1980 { 1981 message("250 ENHANCEDSTATUSCODES"); 1982 break; 1983 } 1984 1985 /* 1986 ** print EHLO features list 1987 ** 1988 ** Note: If you change this list, 1989 ** remember to update 'helpfile' 1990 */ 1991 1992 message("250-ENHANCEDSTATUSCODES"); 1993 #if PIPELINING 1994 if (bitset(SRV_OFFER_PIPE, features)) 1995 message("250-PIPELINING"); 1996 #endif /* PIPELINING */ 1997 if (bitset(SRV_OFFER_EXPN, features)) 1998 { 1999 message("250-EXPN"); 2000 if (bitset(SRV_OFFER_VERB, features)) 2001 message("250-VERB"); 2002 } 2003 #if MIME8TO7 2004 message("250-8BITMIME"); 2005 #endif /* MIME8TO7 */ 2006 if (MaxMessageSize > 0) 2007 message("250-SIZE %ld", MaxMessageSize); 2008 else 2009 message("250-SIZE"); 2010 #if DSN 2011 if (SendMIMEErrors && bitset(SRV_OFFER_DSN, features)) 2012 message("250-DSN"); 2013 #endif /* DSN */ 2014 if (bitset(SRV_OFFER_ETRN, features)) 2015 message("250-ETRN"); 2016 #if SASL 2017 if (sasl_ok && mechlist != NULL && *mechlist != '\0') 2018 message("250-AUTH %s", mechlist); 2019 #endif /* SASL */ 2020 #if STARTTLS 2021 if (tls_ok_srv && 2022 bitset(SRV_OFFER_TLS, features)) 2023 message("250-STARTTLS"); 2024 #endif /* STARTTLS */ 2025 if (DeliverByMin > 0) 2026 message("250-DELIVERBY %ld", 2027 (long) DeliverByMin); 2028 else if (DeliverByMin == 0) 2029 message("250-DELIVERBY"); 2030 2031 /* < 0: no deliver-by */ 2032 2033 message("250 HELP"); 2034 break; 2035 2036 case CMDMAIL: /* mail -- designate sender */ 2037 SmtpPhase = "server MAIL"; 2038 DELAY_CONN("MAIL"); 2039 2040 /* check for validity of this command */ 2041 if (!gothello && bitset(PRIV_NEEDMAILHELO, PrivacyFlags)) 2042 { 2043 usrerr("503 5.0.0 Polite people say HELO first"); 2044 break; 2045 } 2046 if (smtp.sm_gotmail) 2047 { 2048 usrerr("503 5.5.0 Sender already specified"); 2049 break; 2050 } 2051 #if SASL 2052 if (bitset(SRV_REQ_AUTH, features) && 2053 authenticating != SASL_IS_AUTH) 2054 { 2055 usrerr("530 5.7.0 Authentication required"); 2056 break; 2057 } 2058 #endif /* SASL */ 2059 2060 p = skipword(p, "from"); 2061 if (p == NULL) 2062 break; 2063 if (tempfail) 2064 { 2065 if (LogLevel > 9) 2066 sm_syslog(LOG_INFO, e->e_id, 2067 "SMTP MAIL command (%.100s) from %s tempfailed (due to previous checks)", 2068 p, CurSmtpClient); 2069 usrerr(MSG_TEMPFAIL); 2070 break; 2071 } 2072 2073 /* make sure we know who the sending host is */ 2074 if (sendinghost == NULL) 2075 sendinghost = peerhostname; 2076 2077 2078 #if SM_HEAP_CHECK 2079 if (sm_debug_active(&DebugLeakSmtp, 1)) 2080 { 2081 sm_heap_newgroup(); 2082 sm_dprintf("smtp() heap group #%d\n", 2083 sm_heap_group()); 2084 } 2085 #endif /* SM_HEAP_CHECK */ 2086 2087 if (Errors > 0) 2088 goto undo_no_pm; 2089 if (!gothello) 2090 { 2091 auth_warning(e, "%s didn't use HELO protocol", 2092 CurSmtpClient); 2093 } 2094 #ifdef PICKY_HELO_CHECK 2095 if (sm_strcasecmp(sendinghost, peerhostname) != 0 && 2096 (sm_strcasecmp(peerhostname, "localhost") != 0 || 2097 sm_strcasecmp(sendinghost, MyHostName) != 0)) 2098 { 2099 auth_warning(e, "Host %s claimed to be %s", 2100 CurSmtpClient, sendinghost); 2101 } 2102 #endif /* PICKY_HELO_CHECK */ 2103 2104 if (protocol == NULL) 2105 protocol = "SMTP"; 2106 macdefine(&e->e_macro, A_PERM, 'r', protocol); 2107 macdefine(&e->e_macro, A_PERM, 's', sendinghost); 2108 2109 if (Errors > 0) 2110 goto undo_no_pm; 2111 smtp.sm_nrcpts = 0; 2112 n_badrcpts = 0; 2113 macdefine(&e->e_macro, A_PERM, macid("{ntries}"), "0"); 2114 macdefine(&e->e_macro, A_PERM, macid("{nrcpts}"), "0"); 2115 e->e_flags |= EF_CLRQUEUE; 2116 sm_setproctitle(true, e, "%s %s: %.80s", 2117 qid_printname(e), 2118 CurSmtpClient, inp); 2119 2120 /* do the processing */ 2121 SM_TRY 2122 { 2123 extern char *FullName; 2124 2125 QuickAbort = true; 2126 SM_FREE_CLR(FullName); 2127 2128 /* must parse sender first */ 2129 delimptr = NULL; 2130 setsender(p, e, &delimptr, ' ', false); 2131 if (delimptr != NULL && *delimptr != '\0') 2132 *delimptr++ = '\0'; 2133 if (Errors > 0) 2134 sm_exc_raisenew_x(&EtypeQuickAbort, 1); 2135 2136 /* Successfully set e_from, allow logging */ 2137 e->e_flags |= EF_LOGSENDER; 2138 2139 /* put resulting triple from parseaddr() into macros */ 2140 if (e->e_from.q_mailer != NULL) 2141 macdefine(&e->e_macro, A_PERM, 2142 macid("{mail_mailer}"), 2143 e->e_from.q_mailer->m_name); 2144 else 2145 macdefine(&e->e_macro, A_PERM, 2146 macid("{mail_mailer}"), NULL); 2147 if (e->e_from.q_host != NULL) 2148 macdefine(&e->e_macro, A_PERM, 2149 macid("{mail_host}"), 2150 e->e_from.q_host); 2151 else 2152 macdefine(&e->e_macro, A_PERM, 2153 macid("{mail_host}"), "localhost"); 2154 if (e->e_from.q_user != NULL) 2155 macdefine(&e->e_macro, A_PERM, 2156 macid("{mail_addr}"), 2157 e->e_from.q_user); 2158 else 2159 macdefine(&e->e_macro, A_PERM, 2160 macid("{mail_addr}"), NULL); 2161 if (Errors > 0) 2162 sm_exc_raisenew_x(&EtypeQuickAbort, 1); 2163 2164 /* check for possible spoofing */ 2165 if (RealUid != 0 && OpMode == MD_SMTP && 2166 !wordinclass(RealUserName, 't') && 2167 (!bitnset(M_LOCALMAILER, 2168 e->e_from.q_mailer->m_flags) || 2169 strcmp(e->e_from.q_user, RealUserName) != 0)) 2170 { 2171 auth_warning(e, "%s owned process doing -bs", 2172 RealUserName); 2173 } 2174 2175 /* reset to default value */ 2176 SevenBitInput = save_sevenbitinput; 2177 2178 /* now parse ESMTP arguments */ 2179 e->e_msgsize = 0; 2180 addr = p; 2181 argno = 0; 2182 args[argno++] = p; 2183 p = delimptr; 2184 while (p != NULL && *p != '\0') 2185 { 2186 char *kp; 2187 char *vp = NULL; 2188 char *equal = NULL; 2189 2190 /* locate the beginning of the keyword */ 2191 SKIP_SPACE(p); 2192 if (*p == '\0') 2193 break; 2194 kp = p; 2195 2196 /* skip to the value portion */ 2197 while ((isascii(*p) && isalnum(*p)) || *p == '-') 2198 p++; 2199 if (*p == '=') 2200 { 2201 equal = p; 2202 *p++ = '\0'; 2203 vp = p; 2204 2205 /* skip to the end of the value */ 2206 while (*p != '\0' && *p != ' ' && 2207 !(isascii(*p) && iscntrl(*p)) && 2208 *p != '=') 2209 p++; 2210 } 2211 2212 if (*p != '\0') 2213 *p++ = '\0'; 2214 2215 if (tTd(19, 1)) 2216 sm_dprintf("MAIL: got arg %s=\"%s\"\n", kp, 2217 vp == NULL ? "<null>" : vp); 2218 2219 mail_esmtp_args(kp, vp, e); 2220 if (equal != NULL) 2221 *equal = '='; 2222 args[argno++] = kp; 2223 if (argno >= MAXSMTPARGS - 1) 2224 usrerr("501 5.5.4 Too many parameters"); 2225 if (Errors > 0) 2226 sm_exc_raisenew_x(&EtypeQuickAbort, 1); 2227 } 2228 args[argno] = NULL; 2229 if (Errors > 0) 2230 sm_exc_raisenew_x(&EtypeQuickAbort, 1); 2231 2232 #if SASL 2233 # if _FFR_AUTH_PASSING 2234 /* set the default AUTH= if the sender didn't */ 2235 if (e->e_auth_param == NULL) 2236 { 2237 /* XXX only do this for an MSA? */ 2238 e->e_auth_param = macvalue(macid("{auth_authen}"), 2239 e); 2240 if (e->e_auth_param == NULL) 2241 e->e_auth_param = "<>"; 2242 2243 /* 2244 ** XXX should we invoke Strust_auth now? 2245 ** authorizing as the client that just 2246 ** authenticated, so we'll trust implicitly 2247 */ 2248 } 2249 # endif /* _FFR_AUTH_PASSING */ 2250 #endif /* SASL */ 2251 2252 /* do config file checking of the sender */ 2253 macdefine(&e->e_macro, A_PERM, 2254 macid("{addr_type}"), "e s"); 2255 #if _FFR_MAIL_MACRO 2256 /* make the "real" sender address available */ 2257 macdefine(&e->e_macro, A_TEMP, macid("{mail_from}"), 2258 e->e_from.q_paddr); 2259 #endif /* _FFR_MAIL_MACRO */ 2260 if (rscheck("check_mail", addr, 2261 NULL, e, RSF_RMCOMM|RSF_COUNT, 3, 2262 NULL, e->e_id) != EX_OK || 2263 Errors > 0) 2264 sm_exc_raisenew_x(&EtypeQuickAbort, 1); 2265 macdefine(&e->e_macro, A_PERM, 2266 macid("{addr_type}"), NULL); 2267 2268 if (MaxMessageSize > 0 && 2269 (e->e_msgsize > MaxMessageSize || 2270 e->e_msgsize < 0)) 2271 { 2272 usrerr("552 5.2.3 Message size exceeds fixed maximum message size (%ld)", 2273 MaxMessageSize); 2274 sm_exc_raisenew_x(&EtypeQuickAbort, 1); 2275 } 2276 2277 /* 2278 ** XXX always check whether there is at least one fs 2279 ** with enough space? 2280 ** However, this may not help much: the queue group 2281 ** selection may later on select a FS that hasn't 2282 ** enough space. 2283 */ 2284 2285 if ((NumFileSys == 1 || NumQueue == 1) && 2286 !enoughdiskspace(e->e_msgsize, e) 2287 #if _FFR_ANY_FREE_FS 2288 && !filesys_free(e->e_msgsize) 2289 #endif /* _FFR_ANY_FREE_FS */ 2290 ) 2291 { 2292 /* 2293 ** We perform this test again when the 2294 ** queue directory is selected, in collect. 2295 */ 2296 2297 usrerr("452 4.4.5 Insufficient disk space; try again later"); 2298 sm_exc_raisenew_x(&EtypeQuickAbort, 1); 2299 } 2300 if (Errors > 0) 2301 sm_exc_raisenew_x(&EtypeQuickAbort, 1); 2302 2303 LogUsrErrs = true; 2304 #if MILTER 2305 if (smtp.sm_milterlist && smtp.sm_milterize && 2306 !bitset(EF_DISCARD, e->e_flags)) 2307 { 2308 char state; 2309 char *response; 2310 2311 response = milter_envfrom(args, e, &state); 2312 MILTER_REPLY("from"); 2313 } 2314 #endif /* MILTER */ 2315 if (Errors > 0) 2316 sm_exc_raisenew_x(&EtypeQuickAbort, 1); 2317 2318 message("250 2.1.0 Sender ok"); 2319 smtp.sm_gotmail = true; 2320 } 2321 SM_EXCEPT(exc, "[!F]*") 2322 { 2323 /* 2324 ** An error occurred while processing a MAIL command. 2325 ** Jump to the common error handling code. 2326 */ 2327 2328 sm_exc_free(exc); 2329 goto undo_no_pm; 2330 } 2331 SM_END_TRY 2332 break; 2333 2334 undo_no_pm: 2335 e->e_flags &= ~EF_PM_NOTIFY; 2336 undo: 2337 break; 2338 2339 case CMDRCPT: /* rcpt -- designate recipient */ 2340 DELAY_CONN("RCPT"); 2341 if (!smtp.sm_gotmail) 2342 { 2343 usrerr("503 5.0.0 Need MAIL before RCPT"); 2344 break; 2345 } 2346 SmtpPhase = "server RCPT"; 2347 SM_TRY 2348 { 2349 QuickAbort = true; 2350 LogUsrErrs = true; 2351 2352 /* limit flooding of our machine */ 2353 if (MaxRcptPerMsg > 0 && 2354 smtp.sm_nrcpts >= MaxRcptPerMsg) 2355 { 2356 /* sleep(1); / * slow down? */ 2357 usrerr("452 4.5.3 Too many recipients"); 2358 goto rcpt_done; 2359 } 2360 2361 if (e->e_sendmode != SM_DELIVER) 2362 e->e_flags |= EF_VRFYONLY; 2363 2364 #if MILTER 2365 /* 2366 ** If the filter will be deleting recipients, 2367 ** don't expand them at RCPT time (in the call 2368 ** to recipient()). If they are expanded, it 2369 ** is impossible for removefromlist() to figure 2370 ** out the expanded members of the original 2371 ** recipient and mark them as QS_DONTSEND. 2372 */ 2373 2374 if (milter_can_delrcpts()) 2375 e->e_flags |= EF_VRFYONLY; 2376 #endif /* MILTER */ 2377 2378 p = skipword(p, "to"); 2379 if (p == NULL) 2380 goto rcpt_done; 2381 macdefine(&e->e_macro, A_PERM, 2382 macid("{addr_type}"), "e r"); 2383 a = parseaddr(p, NULLADDR, RF_COPYALL, ' ', &delimptr, 2384 e, true); 2385 macdefine(&e->e_macro, A_PERM, 2386 macid("{addr_type}"), NULL); 2387 if (BadRcptThrottle > 0 && 2388 n_badrcpts >= BadRcptThrottle) 2389 { 2390 if (LogLevel > 5 && 2391 n_badrcpts == BadRcptThrottle) 2392 { 2393 sm_syslog(LOG_INFO, e->e_id, 2394 "%s: Possible SMTP RCPT flood, throttling.", 2395 CurSmtpClient); 2396 2397 /* To avoid duplicated message */ 2398 n_badrcpts++; 2399 } 2400 2401 /* 2402 ** Don't use exponential backoff for now. 2403 ** Some servers will open more connections 2404 ** and actually overload the receiver even 2405 ** more. 2406 */ 2407 2408 (void) sleep(1); 2409 } 2410 if (Errors > 0) 2411 goto rcpt_done; 2412 if (a == NULL) 2413 { 2414 usrerr("501 5.0.0 Missing recipient"); 2415 goto rcpt_done; 2416 } 2417 2418 if (delimptr != NULL && *delimptr != '\0') 2419 *delimptr++ = '\0'; 2420 2421 /* put resulting triple from parseaddr() into macros */ 2422 if (a->q_mailer != NULL) 2423 macdefine(&e->e_macro, A_PERM, 2424 macid("{rcpt_mailer}"), 2425 a->q_mailer->m_name); 2426 else 2427 macdefine(&e->e_macro, A_PERM, 2428 macid("{rcpt_mailer}"), NULL); 2429 if (a->q_host != NULL) 2430 macdefine(&e->e_macro, A_PERM, 2431 macid("{rcpt_host}"), a->q_host); 2432 else 2433 macdefine(&e->e_macro, A_PERM, 2434 macid("{rcpt_host}"), "localhost"); 2435 if (a->q_user != NULL) 2436 macdefine(&e->e_macro, A_PERM, 2437 macid("{rcpt_addr}"), a->q_user); 2438 else 2439 macdefine(&e->e_macro, A_PERM, 2440 macid("{rcpt_addr}"), NULL); 2441 if (Errors > 0) 2442 goto rcpt_done; 2443 2444 /* now parse ESMTP arguments */ 2445 addr = p; 2446 argno = 0; 2447 args[argno++] = p; 2448 p = delimptr; 2449 while (p != NULL && *p != '\0') 2450 { 2451 char *kp; 2452 char *vp = NULL; 2453 char *equal = NULL; 2454 2455 /* locate the beginning of the keyword */ 2456 SKIP_SPACE(p); 2457 if (*p == '\0') 2458 break; 2459 kp = p; 2460 2461 /* skip to the value portion */ 2462 while ((isascii(*p) && isalnum(*p)) || *p == '-') 2463 p++; 2464 if (*p == '=') 2465 { 2466 equal = p; 2467 *p++ = '\0'; 2468 vp = p; 2469 2470 /* skip to the end of the value */ 2471 while (*p != '\0' && *p != ' ' && 2472 !(isascii(*p) && iscntrl(*p)) && 2473 *p != '=') 2474 p++; 2475 } 2476 2477 if (*p != '\0') 2478 *p++ = '\0'; 2479 2480 if (tTd(19, 1)) 2481 sm_dprintf("RCPT: got arg %s=\"%s\"\n", kp, 2482 vp == NULL ? "<null>" : vp); 2483 2484 rcpt_esmtp_args(a, kp, vp, e); 2485 if (equal != NULL) 2486 *equal = '='; 2487 args[argno++] = kp; 2488 if (argno >= MAXSMTPARGS - 1) 2489 usrerr("501 5.5.4 Too many parameters"); 2490 if (Errors > 0) 2491 break; 2492 } 2493 args[argno] = NULL; 2494 if (Errors > 0) 2495 goto rcpt_done; 2496 2497 /* do config file checking of the recipient */ 2498 macdefine(&e->e_macro, A_PERM, 2499 macid("{addr_type}"), "e r"); 2500 if (rscheck("check_rcpt", addr, 2501 NULL, e, RSF_RMCOMM|RSF_COUNT, 3, 2502 NULL, e->e_id) != EX_OK || 2503 Errors > 0) 2504 goto rcpt_done; 2505 macdefine(&e->e_macro, A_PERM, 2506 macid("{addr_type}"), NULL); 2507 2508 /* If discarding, don't bother to verify user */ 2509 if (bitset(EF_DISCARD, e->e_flags)) 2510 a->q_state = QS_VERIFIED; 2511 2512 #if MILTER 2513 if (smtp.sm_milterlist && smtp.sm_milterize && 2514 !bitset(EF_DISCARD, e->e_flags)) 2515 { 2516 char state; 2517 char *response; 2518 2519 response = milter_envrcpt(args, e, &state); 2520 MILTER_REPLY("to"); 2521 } 2522 #endif /* MILTER */ 2523 2524 macdefine(&e->e_macro, A_PERM, 2525 macid("{rcpt_mailer}"), NULL); 2526 macdefine(&e->e_macro, A_PERM, 2527 macid("{rcpt_host}"), NULL); 2528 macdefine(&e->e_macro, A_PERM, 2529 macid("{rcpt_addr}"), NULL); 2530 macdefine(&e->e_macro, A_PERM, 2531 macid("{dsn_notify}"), NULL); 2532 if (Errors > 0) 2533 goto rcpt_done; 2534 2535 /* save in recipient list after ESMTP mods */ 2536 a = recipient(a, &e->e_sendqueue, 0, e); 2537 if (Errors > 0) 2538 goto rcpt_done; 2539 2540 /* no errors during parsing, but might be a duplicate */ 2541 e->e_to = a->q_paddr; 2542 if (!QS_IS_BADADDR(a->q_state)) 2543 { 2544 if (smtp.sm_nrcpts == 0) 2545 initsys(e); 2546 message("250 2.1.5 Recipient ok%s", 2547 QS_IS_QUEUEUP(a->q_state) ? 2548 " (will queue)" : ""); 2549 smtp.sm_nrcpts++; 2550 } 2551 else 2552 { 2553 /* punt -- should keep message in ADDRESS.... */ 2554 usrerr("550 5.1.1 Addressee unknown"); 2555 } 2556 rcpt_done: 2557 if (Errors > 0) 2558 ++n_badrcpts; 2559 } 2560 SM_EXCEPT(exc, "[!F]*") 2561 { 2562 /* An exception occurred while processing RCPT */ 2563 e->e_flags &= ~(EF_FATALERRS|EF_PM_NOTIFY); 2564 ++n_badrcpts; 2565 } 2566 SM_END_TRY 2567 break; 2568 2569 case CMDDATA: /* data -- text of mail */ 2570 DELAY_CONN("DATA"); 2571 smtp_data(&smtp, e); 2572 break; 2573 2574 case CMDRSET: /* rset -- reset state */ 2575 if (tTd(94, 100)) 2576 message("451 4.0.0 Test failure"); 2577 else 2578 message("250 2.0.0 Reset state"); 2579 CLEAR_STATE(cmdbuf); 2580 #if _FFR_QUARANTINE 2581 /* restore connection quarantining */ 2582 if (smtp.sm_quarmsg == NULL) 2583 { 2584 e->e_quarmsg = NULL; 2585 macdefine(&e->e_macro, A_PERM, 2586 macid("{quarantine}"), ""); 2587 } 2588 else 2589 { 2590 e->e_quarmsg = sm_rpool_strdup_x(e->e_rpool, 2591 smtp.sm_quarmsg); 2592 macdefine(&e->e_macro, A_PERM, 2593 macid("{quarantine}"), e->e_quarmsg); 2594 } 2595 #endif /* _FFR_QUARANTINE */ 2596 break; 2597 2598 case CMDVRFY: /* vrfy -- verify address */ 2599 case CMDEXPN: /* expn -- expand address */ 2600 vrfy = c->cmd_code == CMDVRFY; 2601 DELAY_CONN(vrfy ? "VRFY" : "EXPN"); 2602 if (tempfail) 2603 { 2604 if (LogLevel > 9) 2605 sm_syslog(LOG_INFO, e->e_id, 2606 "SMTP %s command (%.100s) from %s tempfailed (due to previous checks)", 2607 vrfy ? "VRFY" : "EXPN", 2608 p, CurSmtpClient); 2609 2610 /* RFC 821 doesn't allow 4xy reply code */ 2611 usrerr("550 5.7.1 Please try again later"); 2612 break; 2613 } 2614 wt = checksmtpattack(&n_verifies, MAXVRFYCOMMANDS, 2615 false, vrfy ? "VRFY" : "EXPN", e); 2616 previous = curtime(); 2617 if ((vrfy && bitset(PRIV_NOVRFY, PrivacyFlags)) || 2618 (!vrfy && !bitset(SRV_OFFER_EXPN, features))) 2619 { 2620 if (vrfy) 2621 message("252 2.5.2 Cannot VRFY user; try RCPT to attempt delivery (or try finger)"); 2622 else 2623 message("502 5.7.0 Sorry, we do not allow this operation"); 2624 if (LogLevel > 5) 2625 sm_syslog(LOG_INFO, e->e_id, 2626 "%s: %s [rejected]", 2627 CurSmtpClient, 2628 shortenstring(inp, MAXSHORTSTR)); 2629 break; 2630 } 2631 else if (!gothello && 2632 bitset(vrfy ? PRIV_NEEDVRFYHELO : PRIV_NEEDEXPNHELO, 2633 PrivacyFlags)) 2634 { 2635 usrerr("503 5.0.0 I demand that you introduce yourself first"); 2636 break; 2637 } 2638 if (Errors > 0) 2639 break; 2640 if (LogLevel > 5) 2641 sm_syslog(LOG_INFO, e->e_id, "%s: %s", 2642 CurSmtpClient, 2643 shortenstring(inp, MAXSHORTSTR)); 2644 SM_TRY 2645 { 2646 QuickAbort = true; 2647 vrfyqueue = NULL; 2648 if (vrfy) 2649 e->e_flags |= EF_VRFYONLY; 2650 while (*p != '\0' && isascii(*p) && isspace(*p)) 2651 p++; 2652 if (*p == '\0') 2653 { 2654 usrerr("501 5.5.2 Argument required"); 2655 } 2656 else 2657 { 2658 /* do config file checking of the address */ 2659 if (rscheck(vrfy ? "check_vrfy" : "check_expn", 2660 p, NULL, e, RSF_RMCOMM, 2661 3, NULL, NOQID) != EX_OK || 2662 Errors > 0) 2663 sm_exc_raisenew_x(&EtypeQuickAbort, 1); 2664 (void) sendtolist(p, NULLADDR, &vrfyqueue, 0, e); 2665 } 2666 if (wt > 0) 2667 { 2668 time_t t; 2669 2670 t = wt - (curtime() - previous); 2671 if (t > 0) 2672 (void) sleep(t); 2673 } 2674 if (Errors > 0) 2675 sm_exc_raisenew_x(&EtypeQuickAbort, 1); 2676 if (vrfyqueue == NULL) 2677 { 2678 usrerr("554 5.5.2 Nothing to %s", vrfy ? "VRFY" : "EXPN"); 2679 } 2680 while (vrfyqueue != NULL) 2681 { 2682 if (!QS_IS_UNDELIVERED(vrfyqueue->q_state)) 2683 { 2684 vrfyqueue = vrfyqueue->q_next; 2685 continue; 2686 } 2687 2688 /* see if there is more in the vrfy list */ 2689 a = vrfyqueue; 2690 while ((a = a->q_next) != NULL && 2691 (!QS_IS_UNDELIVERED(a->q_state))) 2692 continue; 2693 printvrfyaddr(vrfyqueue, a == NULL, vrfy); 2694 vrfyqueue = a; 2695 } 2696 } 2697 SM_EXCEPT(exc, "[!F]*") 2698 { 2699 /* 2700 ** An exception occurred while processing VRFY/EXPN 2701 */ 2702 2703 sm_exc_free(exc); 2704 goto undo; 2705 } 2706 SM_END_TRY 2707 break; 2708 2709 case CMDETRN: /* etrn -- force queue flush */ 2710 DELAY_CONN("ETRN"); 2711 2712 /* Don't leak queue information via debug flags */ 2713 if (!bitset(SRV_OFFER_ETRN, features) || UseMSP || 2714 (RealUid != 0 && RealUid != TrustedUid && 2715 OpMode == MD_SMTP)) 2716 { 2717 /* different message for MSA ? */ 2718 message("502 5.7.0 Sorry, we do not allow this operation"); 2719 if (LogLevel > 5) 2720 sm_syslog(LOG_INFO, e->e_id, 2721 "%s: %s [rejected]", 2722 CurSmtpClient, 2723 shortenstring(inp, MAXSHORTSTR)); 2724 break; 2725 } 2726 if (tempfail) 2727 { 2728 if (LogLevel > 9) 2729 sm_syslog(LOG_INFO, e->e_id, 2730 "SMTP ETRN command (%.100s) from %s tempfailed (due to previous checks)", 2731 p, CurSmtpClient); 2732 usrerr(MSG_TEMPFAIL); 2733 break; 2734 } 2735 2736 if (strlen(p) <= 0) 2737 { 2738 usrerr("500 5.5.2 Parameter required"); 2739 break; 2740 } 2741 2742 /* crude way to avoid denial-of-service attacks */ 2743 (void) checksmtpattack(&n_etrn, MAXETRNCOMMANDS, true, 2744 "ETRN", e); 2745 2746 /* 2747 ** Do config file checking of the parameter. 2748 ** Even though we have srv_features now, we still 2749 ** need this ruleset because the former is called 2750 ** when the connection has been established, while 2751 ** this ruleset is called when the command is 2752 ** actually issued and therefore has all information 2753 ** available to make a decision. 2754 */ 2755 2756 if (rscheck("check_etrn", p, NULL, e, 2757 RSF_RMCOMM, 3, NULL, NOQID) != EX_OK || 2758 Errors > 0) 2759 break; 2760 2761 if (LogLevel > 5) 2762 sm_syslog(LOG_INFO, e->e_id, 2763 "%s: ETRN %s", CurSmtpClient, 2764 shortenstring(p, MAXSHORTSTR)); 2765 2766 id = p; 2767 if (*id == '#') 2768 { 2769 int i, qgrp; 2770 2771 id++; 2772 qgrp = name2qid(id); 2773 if (!ISVALIDQGRP(qgrp)) 2774 { 2775 usrerr("459 4.5.4 Queue %s unknown", 2776 id); 2777 break; 2778 } 2779 for (i = 0; i < NumQueue && Queue[i] != NULL; 2780 i++) 2781 Queue[i]->qg_nextrun = (time_t) -1; 2782 Queue[qgrp]->qg_nextrun = 0; 2783 ok = run_work_group(Queue[qgrp]->qg_wgrp, 2784 RWG_FORK|RWG_FORCE); 2785 if (ok && Errors == 0) 2786 message("250 2.0.0 Queuing for queue group %s started", id); 2787 break; 2788 } 2789 2790 if (*id == '@') 2791 id++; 2792 else 2793 *--id = '@'; 2794 2795 new = (QUEUE_CHAR *) sm_malloc(sizeof(QUEUE_CHAR)); 2796 if (new == NULL) 2797 { 2798 syserr("500 5.5.0 ETRN out of memory"); 2799 break; 2800 } 2801 new->queue_match = id; 2802 new->queue_negate = false; 2803 new->queue_next = NULL; 2804 QueueLimitRecipient = new; 2805 ok = runqueue(true, false, false, true); 2806 sm_free(QueueLimitRecipient); /* XXX */ 2807 QueueLimitRecipient = NULL; 2808 if (ok && Errors == 0) 2809 message("250 2.0.0 Queuing for node %s started", p); 2810 break; 2811 2812 case CMDHELP: /* help -- give user info */ 2813 DELAY_CONN("HELP"); 2814 help(p, e); 2815 break; 2816 2817 case CMDNOOP: /* noop -- do nothing */ 2818 DELAY_CONN("NOOP"); 2819 (void) checksmtpattack(&n_noop, MAXNOOPCOMMANDS, true, 2820 "NOOP", e); 2821 message("250 2.0.0 OK"); 2822 break; 2823 2824 case CMDQUIT: /* quit -- leave mail */ 2825 message("221 2.0.0 %s closing connection", MyHostName); 2826 #if PIPELINING 2827 (void) sm_io_flush(OutChannel, SM_TIME_DEFAULT); 2828 #endif /* PIPELINING */ 2829 2830 if (smtp.sm_nrcpts > 0) 2831 logundelrcpts(e, "aborted by sender", 9, false); 2832 2833 /* arrange to ignore any current send list */ 2834 e->e_sendqueue = NULL; 2835 2836 #if STARTTLS 2837 /* shutdown TLS connection */ 2838 if (tls_active) 2839 { 2840 (void) endtls(srv_ssl, "server"); 2841 tls_active = false; 2842 } 2843 #endif /* STARTTLS */ 2844 #if SASL 2845 if (authenticating == SASL_IS_AUTH) 2846 { 2847 sasl_dispose(&conn); 2848 authenticating = SASL_NOT_AUTH; 2849 /* XXX sasl_done(); this is a child */ 2850 } 2851 #endif /* SASL */ 2852 2853 doquit: 2854 /* avoid future 050 messages */ 2855 disconnect(1, e); 2856 2857 #if MILTER 2858 /* close out milter filters */ 2859 milter_quit(e); 2860 #endif /* MILTER */ 2861 2862 if (LogLevel > 4 && bitset(EF_LOGSENDER, e->e_flags)) 2863 logsender(e, NULL); 2864 e->e_flags &= ~EF_LOGSENDER; 2865 2866 if (lognullconnection && LogLevel > 5 && 2867 nullserver == NULL) 2868 { 2869 char *d; 2870 2871 d = macvalue(macid("{daemon_name}"), e); 2872 if (d == NULL) 2873 d = "stdin"; 2874 2875 /* 2876 ** even though this id is "bogus", it makes 2877 ** it simpler to "grep" related events, e.g., 2878 ** timeouts for the same connection. 2879 */ 2880 2881 sm_syslog(LOG_INFO, e->e_id, 2882 "%s did not issue MAIL/EXPN/VRFY/ETRN during connection to %s", 2883 CurSmtpClient, d); 2884 } 2885 if (tTd(93, 100)) 2886 { 2887 /* return to handle next connection */ 2888 return; 2889 } 2890 finis(true, true, ExitStat); 2891 /* NOTREACHED */ 2892 2893 case CMDVERB: /* set verbose mode */ 2894 DELAY_CONN("VERB"); 2895 if (!bitset(SRV_OFFER_EXPN, features) || 2896 !bitset(SRV_OFFER_VERB, features)) 2897 { 2898 /* this would give out the same info */ 2899 message("502 5.7.0 Verbose unavailable"); 2900 break; 2901 } 2902 (void) checksmtpattack(&n_noop, MAXNOOPCOMMANDS, true, 2903 "VERB", e); 2904 Verbose = 1; 2905 set_delivery_mode(SM_DELIVER, e); 2906 message("250 2.0.0 Verbose mode"); 2907 break; 2908 2909 #if SMTPDEBUG 2910 case CMDDBGQSHOW: /* show queues */ 2911 (void) sm_io_fprintf(smioout, SM_TIME_DEFAULT, 2912 "Send Queue="); 2913 printaddr(e->e_sendqueue, true); 2914 break; 2915 2916 case CMDDBGDEBUG: /* set debug mode */ 2917 tTsetup(tTdvect, sizeof tTdvect, "0-99.1"); 2918 tTflag(p); 2919 message("200 2.0.0 Debug set"); 2920 break; 2921 2922 #else /* SMTPDEBUG */ 2923 case CMDDBGQSHOW: /* show queues */ 2924 case CMDDBGDEBUG: /* set debug mode */ 2925 #endif /* SMTPDEBUG */ 2926 case CMDLOGBOGUS: /* bogus command */ 2927 DELAY_CONN("Bogus"); 2928 if (LogLevel > 0) 2929 sm_syslog(LOG_CRIT, e->e_id, 2930 "\"%s\" command from %s (%.100s)", 2931 c->cmd_name, CurSmtpClient, 2932 anynet_ntoa(&RealHostAddr)); 2933 /* FALLTHROUGH */ 2934 2935 case CMDERROR: /* unknown command */ 2936 #if MAXBADCOMMANDS > 0 2937 if (++n_badcmds > MAXBADCOMMANDS) 2938 { 2939 message("421 4.7.0 %s Too many bad commands; closing connection", 2940 MyHostName); 2941 2942 /* arrange to ignore any current send list */ 2943 e->e_sendqueue = NULL; 2944 goto doquit; 2945 } 2946 #endif /* MAXBADCOMMANDS > 0 */ 2947 2948 usrerr("500 5.5.1 Command unrecognized: \"%s\"", 2949 shortenstring(inp, MAXSHORTSTR)); 2950 break; 2951 2952 case CMDUNIMPL: 2953 DELAY_CONN("Unimpl"); 2954 usrerr("502 5.5.1 Command not implemented: \"%s\"", 2955 shortenstring(inp, MAXSHORTSTR)); 2956 break; 2957 2958 default: 2959 DELAY_CONN("default"); 2960 errno = 0; 2961 syserr("500 5.5.0 smtp: unknown code %d", c->cmd_code); 2962 break; 2963 } 2964 #if SASL 2965 } 2966 #endif /* SASL */ 2967 } 2968 SM_EXCEPT(exc, "[!F]*") 2969 { 2970 /* 2971 ** The only possible exception is "E:mta.quickabort". 2972 ** There is nothing to do except fall through and loop. 2973 */ 2974 } 2975 SM_END_TRY 2976 } 2977 } 2978 /* 2979 ** SMTP_DATA -- implement the SMTP DATA command. 2980 ** 2981 ** Parameters: 2982 ** smtp -- status of SMTP connection. 2983 ** e -- envelope. 2984 ** 2985 ** Returns: 2986 ** none. 2987 ** 2988 ** Side Effects: 2989 ** possibly sends message. 2990 */ 2991 2992 static void 2993 smtp_data(smtp, e) 2994 SMTP_T *smtp; 2995 ENVELOPE *e; 2996 { 2997 #if MILTER 2998 bool milteraccept; 2999 #endif /* MILTER */ 3000 bool aborting; 3001 bool doublequeue; 3002 ADDRESS *a; 3003 ENVELOPE *ee; 3004 char *id; 3005 char *oldid; 3006 char buf[32]; 3007 3008 SmtpPhase = "server DATA"; 3009 if (!smtp->sm_gotmail) 3010 { 3011 usrerr("503 5.0.0 Need MAIL command"); 3012 return; 3013 } 3014 else if (smtp->sm_nrcpts <= 0) 3015 { 3016 usrerr("503 5.0.0 Need RCPT (recipient)"); 3017 return; 3018 } 3019 (void) sm_snprintf(buf, sizeof buf, "%u", smtp->sm_nrcpts); 3020 if (rscheck("check_data", buf, NULL, e, 3021 RSF_RMCOMM|RSF_UNSTRUCTURED|RSF_COUNT, 3, NULL, 3022 e->e_id) != EX_OK) 3023 return; 3024 3025 /* put back discard bit */ 3026 if (smtp->sm_discard) 3027 e->e_flags |= EF_DISCARD; 3028 3029 /* check to see if we need to re-expand aliases */ 3030 /* also reset QS_BADADDR on already-diagnosted addrs */ 3031 doublequeue = false; 3032 for (a = e->e_sendqueue; a != NULL; a = a->q_next) 3033 { 3034 if (QS_IS_VERIFIED(a->q_state) && 3035 !bitset(EF_DISCARD, e->e_flags)) 3036 { 3037 /* need to re-expand aliases */ 3038 doublequeue = true; 3039 } 3040 if (QS_IS_BADADDR(a->q_state)) 3041 { 3042 /* make this "go away" */ 3043 a->q_state = QS_DONTSEND; 3044 } 3045 } 3046 3047 /* collect the text of the message */ 3048 SmtpPhase = "collect"; 3049 buffer_errors(); 3050 3051 #if _FFR_ADAPTIVE_EOL 3052 /* triggers error in collect, disabled for now */ 3053 if (smtp->sm_crlf) 3054 e->e_flags |= EF_NL_NOT_EOL; 3055 #endif /* _FFR_ADAPTIVE_EOL */ 3056 3057 collect(InChannel, true, NULL, e, true); 3058 3059 /* redefine message size */ 3060 (void) sm_snprintf(buf, sizeof buf, "%ld", e->e_msgsize); 3061 macdefine(&e->e_macro, A_TEMP, macid("{msg_size}"), buf); 3062 3063 #if _FFR_CHECK_EOM 3064 /* rscheck() will set Errors or EF_DISCARD if it trips */ 3065 (void) rscheck("check_eom", buf, NULL, e, RSF_UNSTRUCTURED|RSF_COUNT, 3066 3, NULL, e->e_id); 3067 #endif /* _FFR_CHECK_EOM */ 3068 3069 #if MILTER 3070 milteraccept = true; 3071 if (smtp->sm_milterlist && smtp->sm_milterize && 3072 Errors <= 0 && 3073 !bitset(EF_DISCARD, e->e_flags)) 3074 { 3075 char state; 3076 char *response; 3077 3078 response = milter_data(e, &state); 3079 switch (state) 3080 { 3081 case SMFIR_REPLYCODE: 3082 if (MilterLogLevel > 3) 3083 sm_syslog(LOG_INFO, e->e_id, 3084 "Milter: data, reject=%s", 3085 response); 3086 milteraccept = false; 3087 usrerr(response); 3088 break; 3089 3090 case SMFIR_REJECT: 3091 milteraccept = false; 3092 if (MilterLogLevel > 3) 3093 sm_syslog(LOG_INFO, e->e_id, 3094 "Milter: data, reject=554 5.7.1 Command rejected"); 3095 usrerr("554 5.7.1 Command rejected"); 3096 break; 3097 3098 case SMFIR_DISCARD: 3099 if (MilterLogLevel > 3) 3100 sm_syslog(LOG_INFO, e->e_id, 3101 "Milter: data, discard"); 3102 milteraccept = false; 3103 e->e_flags |= EF_DISCARD; 3104 break; 3105 3106 case SMFIR_TEMPFAIL: 3107 if (MilterLogLevel > 3) 3108 sm_syslog(LOG_INFO, e->e_id, 3109 "Milter: data, reject=%s", 3110 MSG_TEMPFAIL); 3111 milteraccept = false; 3112 usrerr(MSG_TEMPFAIL); 3113 break; 3114 } 3115 if (response != NULL) 3116 sm_free(response); 3117 } 3118 3119 /* Milter may have changed message size */ 3120 (void) sm_snprintf(buf, sizeof buf, "%ld", e->e_msgsize); 3121 macdefine(&e->e_macro, A_TEMP, macid("{msg_size}"), buf); 3122 3123 /* abort message filters that didn't get the body & log msg is OK */ 3124 if (smtp->sm_milterlist && smtp->sm_milterize) 3125 { 3126 milter_abort(e); 3127 if (milteraccept && MilterLogLevel > 9) 3128 sm_syslog(LOG_INFO, e->e_id, "Milter accept: message"); 3129 } 3130 #endif /* MILTER */ 3131 3132 #if _FFR_QUARANTINE 3133 /* Check if quarantining stats should be updated */ 3134 if (e->e_quarmsg != NULL) 3135 markstats(e, NULL, STATS_QUARANTINE); 3136 #endif /* _FFR_QUARANTINE */ 3137 3138 /* 3139 ** If a header/body check (header checks or milter) 3140 ** set EF_DISCARD, don't queueup the message -- 3141 ** that would lose the EF_DISCARD bit and deliver 3142 ** the message. 3143 */ 3144 3145 if (bitset(EF_DISCARD, e->e_flags)) 3146 doublequeue = false; 3147 3148 aborting = Errors > 0; 3149 if (!aborting && 3150 #if _FFR_QUARANTINE 3151 (QueueMode == QM_QUARANTINE || e->e_quarmsg == NULL) && 3152 #endif /* _FFR_QUARANTINE */ 3153 !split_by_recipient(e)) 3154 aborting = bitset(EF_FATALERRS, e->e_flags); 3155 3156 if (aborting) 3157 { 3158 /* Log who the mail would have gone to */ 3159 logundelrcpts(e, e->e_message, 8, false); 3160 flush_errors(true); 3161 buffer_errors(); 3162 goto abortmessage; 3163 } 3164 3165 /* from now on, we have to operate silently */ 3166 buffer_errors(); 3167 3168 #if 0 3169 /* 3170 ** Clear message, it may contain an error from the SMTP dialogue. 3171 ** This error must not show up in the queue. 3172 ** Some error message should show up, e.g., alias database 3173 ** not available, but others shouldn't, e.g., from check_rcpt. 3174 */ 3175 3176 e->e_message = NULL; 3177 #endif /* 0 */ 3178 3179 /* 3180 ** Arrange to send to everyone. 3181 ** If sending to multiple people, mail back 3182 ** errors rather than reporting directly. 3183 ** In any case, don't mail back errors for 3184 ** anything that has happened up to 3185 ** now (the other end will do this). 3186 ** Truncate our transcript -- the mail has gotten 3187 ** to us successfully, and if we have 3188 ** to mail this back, it will be easier 3189 ** on the reader. 3190 ** Then send to everyone. 3191 ** Finally give a reply code. If an error has 3192 ** already been given, don't mail a 3193 ** message back. 3194 ** We goose error returns by clearing error bit. 3195 */ 3196 3197 SmtpPhase = "delivery"; 3198 (void) sm_io_setinfo(e->e_xfp, SM_BF_TRUNCATE, NULL); 3199 id = e->e_id; 3200 3201 #if NAMED_BIND 3202 _res.retry = TimeOuts.res_retry[RES_TO_FIRST]; 3203 _res.retrans = TimeOuts.res_retrans[RES_TO_FIRST]; 3204 #endif /* NAMED_BIND */ 3205 3206 for (ee = e; ee != NULL; ee = ee->e_sibling) 3207 { 3208 /* make sure we actually do delivery */ 3209 ee->e_flags &= ~EF_CLRQUEUE; 3210 3211 /* from now on, operate silently */ 3212 ee->e_errormode = EM_MAIL; 3213 3214 if (doublequeue) 3215 { 3216 /* make sure it is in the queue */ 3217 queueup(ee, false, true); 3218 } 3219 else 3220 { 3221 /* send to all recipients */ 3222 sendall(ee, SM_DEFAULT); 3223 } 3224 ee->e_to = NULL; 3225 } 3226 3227 /* put back id for SMTP logging in putoutmsg() */ 3228 oldid = CurEnv->e_id; 3229 CurEnv->e_id = id; 3230 3231 /* issue success message */ 3232 message("250 2.0.0 %s Message accepted for delivery", id); 3233 CurEnv->e_id = oldid; 3234 3235 /* if we just queued, poke it */ 3236 if (doublequeue) 3237 { 3238 bool anything_to_send = false; 3239 3240 sm_getla(); 3241 for (ee = e; ee != NULL; ee = ee->e_sibling) 3242 { 3243 if (WILL_BE_QUEUED(ee->e_sendmode)) 3244 continue; 3245 if (shouldqueue(ee->e_msgpriority, ee->e_ctime)) 3246 { 3247 ee->e_sendmode = SM_QUEUE; 3248 continue; 3249 } 3250 #if _FFR_QUARANTINE 3251 else if (QueueMode != QM_QUARANTINE && 3252 ee->e_quarmsg != NULL) 3253 { 3254 ee->e_sendmode = SM_QUEUE; 3255 continue; 3256 } 3257 #endif /* _FFR_QUARANTINE */ 3258 anything_to_send = true; 3259 3260 /* close all the queue files */ 3261 closexscript(ee); 3262 if (ee->e_dfp != NULL) 3263 { 3264 (void) sm_io_close(ee->e_dfp, SM_TIME_DEFAULT); 3265 ee->e_dfp = NULL; 3266 } 3267 unlockqueue(ee); 3268 } 3269 if (anything_to_send) 3270 { 3271 #if PIPELINING 3272 /* 3273 ** XXX if we don't do this, we get 250 twice 3274 ** because it is also flushed in the child. 3275 */ 3276 3277 (void) sm_io_flush(OutChannel, SM_TIME_DEFAULT); 3278 #endif /* PIPELINING */ 3279 (void) doworklist(e, true, true); 3280 } 3281 } 3282 3283 abortmessage: 3284 if (LogLevel > 4 && bitset(EF_LOGSENDER, e->e_flags)) 3285 logsender(e, NULL); 3286 e->e_flags &= ~EF_LOGSENDER; 3287 3288 /* clean up a bit */ 3289 smtp->sm_gotmail = false; 3290 3291 /* 3292 ** Call dropenvelope if and only if the envelope is *not* 3293 ** being processed by the child process forked by doworklist(). 3294 */ 3295 3296 if (aborting || bitset(EF_DISCARD, e->e_flags)) 3297 dropenvelope(e, true, false); 3298 else 3299 { 3300 for (ee = e; ee != NULL; ee = ee->e_sibling) 3301 { 3302 #if _FFR_QUARANTINE 3303 if (!doublequeue && 3304 QueueMode != QM_QUARANTINE && 3305 ee->e_quarmsg != NULL) 3306 { 3307 dropenvelope(ee, true, false); 3308 continue; 3309 } 3310 #endif /* _FFR_QUARANTINE */ 3311 if (WILL_BE_QUEUED(ee->e_sendmode)) 3312 dropenvelope(ee, true, false); 3313 } 3314 } 3315 sm_rpool_free(e->e_rpool); 3316 3317 /* 3318 ** At this point, e == &MainEnvelope, but if we did splitting, 3319 ** then CurEnv may point to an envelope structure that was just 3320 ** freed with the rpool. So reset CurEnv *before* calling 3321 ** newenvelope. 3322 */ 3323 3324 CurEnv = e; 3325 newenvelope(e, e, sm_rpool_new_x(NULL)); 3326 e->e_flags = BlankEnvelope.e_flags; 3327 3328 #if _FFR_QUARANTINE 3329 /* restore connection quarantining */ 3330 if (smtp->sm_quarmsg == NULL) 3331 { 3332 e->e_quarmsg = NULL; 3333 macdefine(&e->e_macro, A_PERM, macid("{quarantine}"), ""); 3334 } 3335 else 3336 { 3337 e->e_quarmsg = sm_rpool_strdup_x(e->e_rpool, smtp->sm_quarmsg); 3338 macdefine(&e->e_macro, A_PERM, 3339 macid("{quarantine}"), e->e_quarmsg); 3340 } 3341 #endif /* _FFR_QUARANTINE */ 3342 } 3343 /* 3344 ** LOGUNDELRCPTS -- log undelivered (or all) recipients. 3345 ** 3346 ** Parameters: 3347 ** e -- envelope. 3348 ** msg -- message for Stat= 3349 ** level -- log level. 3350 ** all -- log all recipients. 3351 ** 3352 ** Returns: 3353 ** none. 3354 ** 3355 ** Side Effects: 3356 ** logs undelivered (or all) recipients 3357 */ 3358 3359 void 3360 logundelrcpts(e, msg, level, all) 3361 ENVELOPE *e; 3362 char *msg; 3363 int level; 3364 bool all; 3365 { 3366 ADDRESS *a; 3367 3368 if (LogLevel <= level || msg == NULL || *msg == '\0') 3369 return; 3370 3371 /* Clear $h so relay= doesn't get mislogged by logdelivery() */ 3372 macdefine(&e->e_macro, A_PERM, 'h', NULL); 3373 3374 /* Log who the mail would have gone to */ 3375 for (a = e->e_sendqueue; a != NULL; a = a->q_next) 3376 { 3377 if (!QS_IS_UNDELIVERED(a->q_state) && !all) 3378 continue; 3379 e->e_to = a->q_paddr; 3380 logdelivery(NULL, NULL, a->q_status, msg, NULL, 3381 (time_t) 0, e); 3382 } 3383 e->e_to = NULL; 3384 } 3385 /* 3386 ** CHECKSMTPATTACK -- check for denial-of-service attack by repetition 3387 ** 3388 ** Parameters: 3389 ** pcounter -- pointer to a counter for this command. 3390 ** maxcount -- maximum value for this counter before we 3391 ** slow down. 3392 ** waitnow -- sleep now (in this routine)? 3393 ** cname -- command name for logging. 3394 ** e -- the current envelope. 3395 ** 3396 ** Returns: 3397 ** time to wait. 3398 ** 3399 ** Side Effects: 3400 ** Slows down if we seem to be under attack. 3401 */ 3402 3403 static time_t 3404 checksmtpattack(pcounter, maxcount, waitnow, cname, e) 3405 volatile unsigned int *pcounter; 3406 int maxcount; 3407 bool waitnow; 3408 char *cname; 3409 ENVELOPE *e; 3410 { 3411 if (maxcount <= 0) /* no limit */ 3412 return (time_t) 0; 3413 3414 if (++(*pcounter) >= maxcount) 3415 { 3416 time_t s; 3417 3418 if (*pcounter == maxcount && LogLevel > 5) 3419 { 3420 sm_syslog(LOG_INFO, e->e_id, 3421 "%s: possible SMTP attack: command=%.40s, count=%u", 3422 CurSmtpClient, cname, *pcounter); 3423 } 3424 s = 1 << (*pcounter - maxcount); 3425 if (s >= MAXTIMEOUT || s <= 0) 3426 s = MAXTIMEOUT; 3427 3428 /* sleep at least 1 second before returning */ 3429 (void) sleep(*pcounter / maxcount); 3430 s -= *pcounter / maxcount; 3431 if (waitnow) 3432 { 3433 (void) sleep(s); 3434 return 0; 3435 } 3436 return s; 3437 } 3438 return (time_t) 0; 3439 } 3440 /* 3441 ** SETUP_SMTPD_IO -- setup I/O fd correctly for the SMTP server 3442 ** 3443 ** Parameters: 3444 ** none. 3445 ** 3446 ** Returns: 3447 ** nothing. 3448 ** 3449 ** Side Effects: 3450 ** may change I/O fd. 3451 */ 3452 3453 static void 3454 setup_smtpd_io() 3455 { 3456 int inchfd, outchfd, outfd; 3457 3458 inchfd = sm_io_getinfo(InChannel, SM_IO_WHAT_FD, NULL); 3459 outchfd = sm_io_getinfo(OutChannel, SM_IO_WHAT_FD, NULL); 3460 outfd = sm_io_getinfo(smioout, SM_IO_WHAT_FD, NULL); 3461 if (outchfd != outfd) 3462 { 3463 /* arrange for debugging output to go to remote host */ 3464 (void) dup2(outchfd, outfd); 3465 } 3466 3467 /* 3468 ** if InChannel and OutChannel are stdin/stdout 3469 ** and connected to ttys 3470 ** and fcntl(STDIN, F_SETFL, O_NONBLOCKING) also changes STDOUT, 3471 ** then "chain" them together. 3472 */ 3473 3474 if (inchfd == STDIN_FILENO && outchfd == STDOUT_FILENO && 3475 isatty(inchfd) && isatty(outchfd)) 3476 { 3477 int inmode, outmode; 3478 3479 inmode = fcntl(inchfd, F_GETFL, 0); 3480 if (inmode == -1) 3481 { 3482 if (LogLevel > 11) 3483 sm_syslog(LOG_INFO, NOQID, 3484 "fcntl(inchfd, F_GETFL) failed: %s", 3485 sm_errstring(errno)); 3486 return; 3487 } 3488 outmode = fcntl(outchfd, F_GETFL, 0); 3489 if (outmode == -1) 3490 { 3491 if (LogLevel > 11) 3492 sm_syslog(LOG_INFO, NOQID, 3493 "fcntl(outchfd, F_GETFL) failed: %s", 3494 sm_errstring(errno)); 3495 return; 3496 } 3497 if (bitset(O_NONBLOCK, inmode) || 3498 bitset(O_NONBLOCK, outmode) || 3499 fcntl(inchfd, F_SETFL, inmode | O_NONBLOCK) == -1) 3500 return; 3501 outmode = fcntl(outchfd, F_GETFL, 0); 3502 if (outmode != -1 && bitset(O_NONBLOCK, outmode)) 3503 { 3504 /* changing InChannel also changes OutChannel */ 3505 sm_io_automode(OutChannel, InChannel); 3506 if (tTd(97, 4) && LogLevel > 9) 3507 sm_syslog(LOG_INFO, NOQID, 3508 "set automode for I (%d)/O (%d) in SMTP server", 3509 inchfd, outchfd); 3510 } 3511 3512 /* undo change of inchfd */ 3513 (void) fcntl(inchfd, F_SETFL, inmode); 3514 } 3515 } 3516 /* 3517 ** SKIPWORD -- skip a fixed word. 3518 ** 3519 ** Parameters: 3520 ** p -- place to start looking. 3521 ** w -- word to skip. 3522 ** 3523 ** Returns: 3524 ** p following w. 3525 ** NULL on error. 3526 ** 3527 ** Side Effects: 3528 ** clobbers the p data area. 3529 */ 3530 3531 static char * 3532 skipword(p, w) 3533 register char *volatile p; 3534 char *w; 3535 { 3536 register char *q; 3537 char *firstp = p; 3538 3539 /* find beginning of word */ 3540 SKIP_SPACE(p); 3541 q = p; 3542 3543 /* find end of word */ 3544 while (*p != '\0' && *p != ':' && !(isascii(*p) && isspace(*p))) 3545 p++; 3546 while (isascii(*p) && isspace(*p)) 3547 *p++ = '\0'; 3548 if (*p != ':') 3549 { 3550 syntax: 3551 usrerr("501 5.5.2 Syntax error in parameters scanning \"%s\"", 3552 shortenstring(firstp, MAXSHORTSTR)); 3553 return NULL; 3554 } 3555 *p++ = '\0'; 3556 SKIP_SPACE(p); 3557 3558 if (*p == '\0') 3559 goto syntax; 3560 3561 /* see if the input word matches desired word */ 3562 if (sm_strcasecmp(q, w)) 3563 goto syntax; 3564 3565 return p; 3566 } 3567 /* 3568 ** MAIL_ESMTP_ARGS -- process ESMTP arguments from MAIL line 3569 ** 3570 ** Parameters: 3571 ** kp -- the parameter key. 3572 ** vp -- the value of that parameter. 3573 ** e -- the envelope. 3574 ** 3575 ** Returns: 3576 ** none. 3577 */ 3578 3579 static void 3580 mail_esmtp_args(kp, vp, e) 3581 char *kp; 3582 char *vp; 3583 ENVELOPE *e; 3584 { 3585 if (sm_strcasecmp(kp, "size") == 0) 3586 { 3587 if (vp == NULL) 3588 { 3589 usrerr("501 5.5.2 SIZE requires a value"); 3590 /* NOTREACHED */ 3591 } 3592 macdefine(&e->e_macro, A_TEMP, macid("{msg_size}"), vp); 3593 errno = 0; 3594 e->e_msgsize = strtol(vp, (char **) NULL, 10); 3595 if (e->e_msgsize == LONG_MAX && errno == ERANGE) 3596 { 3597 usrerr("552 5.2.3 Message size exceeds maximum value"); 3598 /* NOTREACHED */ 3599 } 3600 if (e->e_msgsize < 0) 3601 { 3602 usrerr("552 5.2.3 Message size invalid"); 3603 /* NOTREACHED */ 3604 } 3605 } 3606 else if (sm_strcasecmp(kp, "body") == 0) 3607 { 3608 if (vp == NULL) 3609 { 3610 usrerr("501 5.5.2 BODY requires a value"); 3611 /* NOTREACHED */ 3612 } 3613 else if (sm_strcasecmp(vp, "8bitmime") == 0) 3614 { 3615 SevenBitInput = false; 3616 } 3617 else if (sm_strcasecmp(vp, "7bit") == 0) 3618 { 3619 SevenBitInput = true; 3620 } 3621 else 3622 { 3623 usrerr("501 5.5.4 Unknown BODY type %s", vp); 3624 /* NOTREACHED */ 3625 } 3626 e->e_bodytype = sm_rpool_strdup_x(e->e_rpool, vp); 3627 } 3628 else if (sm_strcasecmp(kp, "envid") == 0) 3629 { 3630 if (bitset(PRIV_NORECEIPTS, PrivacyFlags)) 3631 { 3632 usrerr("504 5.7.0 Sorry, ENVID not supported, we do not allow DSN"); 3633 /* NOTREACHED */ 3634 } 3635 if (vp == NULL) 3636 { 3637 usrerr("501 5.5.2 ENVID requires a value"); 3638 /* NOTREACHED */ 3639 } 3640 if (!xtextok(vp)) 3641 { 3642 usrerr("501 5.5.4 Syntax error in ENVID parameter value"); 3643 /* NOTREACHED */ 3644 } 3645 if (e->e_envid != NULL) 3646 { 3647 usrerr("501 5.5.0 Duplicate ENVID parameter"); 3648 /* NOTREACHED */ 3649 } 3650 e->e_envid = sm_rpool_strdup_x(e->e_rpool, vp); 3651 macdefine(&e->e_macro, A_PERM, 3652 macid("{dsn_envid}"), e->e_envid); 3653 } 3654 else if (sm_strcasecmp(kp, "ret") == 0) 3655 { 3656 if (bitset(PRIV_NORECEIPTS, PrivacyFlags)) 3657 { 3658 usrerr("504 5.7.0 Sorry, RET not supported, we do not allow DSN"); 3659 /* NOTREACHED */ 3660 } 3661 if (vp == NULL) 3662 { 3663 usrerr("501 5.5.2 RET requires a value"); 3664 /* NOTREACHED */ 3665 } 3666 if (bitset(EF_RET_PARAM, e->e_flags)) 3667 { 3668 usrerr("501 5.5.0 Duplicate RET parameter"); 3669 /* NOTREACHED */ 3670 } 3671 e->e_flags |= EF_RET_PARAM; 3672 if (sm_strcasecmp(vp, "hdrs") == 0) 3673 e->e_flags |= EF_NO_BODY_RETN; 3674 else if (sm_strcasecmp(vp, "full") != 0) 3675 { 3676 usrerr("501 5.5.2 Bad argument \"%s\" to RET", vp); 3677 /* NOTREACHED */ 3678 } 3679 macdefine(&e->e_macro, A_TEMP, macid("{dsn_ret}"), vp); 3680 } 3681 #if SASL 3682 else if (sm_strcasecmp(kp, "auth") == 0) 3683 { 3684 int len; 3685 char *q; 3686 char *auth_param; /* the value of the AUTH=x */ 3687 bool saveQuickAbort = QuickAbort; 3688 bool saveSuprErrs = SuprErrs; 3689 bool saveExitStat = ExitStat; 3690 char pbuf[256]; 3691 3692 if (vp == NULL) 3693 { 3694 usrerr("501 5.5.2 AUTH= requires a value"); 3695 /* NOTREACHED */ 3696 } 3697 if (e->e_auth_param != NULL) 3698 { 3699 usrerr("501 5.5.0 Duplicate AUTH parameter"); 3700 /* NOTREACHED */ 3701 } 3702 if ((q = strchr(vp, ' ')) != NULL) 3703 len = q - vp + 1; 3704 else 3705 len = strlen(vp) + 1; 3706 auth_param = xalloc(len); 3707 (void) sm_strlcpy(auth_param, vp, len); 3708 if (!xtextok(auth_param)) 3709 { 3710 usrerr("501 5.5.4 Syntax error in AUTH parameter value"); 3711 /* just a warning? */ 3712 /* NOTREACHED */ 3713 } 3714 3715 /* XXX this might be cut off */ 3716 (void) sm_strlcpy(pbuf, xuntextify(auth_param), sizeof pbuf); 3717 /* xalloc() the buffer instead? */ 3718 3719 /* XXX define this always or only if trusted? */ 3720 macdefine(&e->e_macro, A_TEMP, macid("{auth_author}"), pbuf); 3721 3722 /* 3723 ** call Strust_auth to find out whether 3724 ** auth_param is acceptable (trusted) 3725 ** we shouldn't trust it if not authenticated 3726 ** (required by RFC, leave it to ruleset?) 3727 */ 3728 3729 SuprErrs = true; 3730 QuickAbort = false; 3731 if (strcmp(auth_param, "<>") != 0 && 3732 (rscheck("trust_auth", pbuf, NULL, e, RSF_RMCOMM, 3733 9, NULL, NOQID) != EX_OK || Errors > 0)) 3734 { 3735 if (tTd(95, 8)) 3736 { 3737 q = e->e_auth_param; 3738 sm_dprintf("auth=\"%.100s\" not trusted user=\"%.100s\"\n", 3739 pbuf, (q == NULL) ? "" : q); 3740 } 3741 3742 /* not trusted */ 3743 e->e_auth_param = "<>"; 3744 # if _FFR_AUTH_PASSING 3745 macdefine(&BlankEnvelope.e_macro, A_PERM, 3746 macid("{auth_author}"), NULL); 3747 # endif /* _FFR_AUTH_PASSING */ 3748 } 3749 else 3750 { 3751 if (tTd(95, 8)) 3752 sm_dprintf("auth=\"%.100s\" trusted\n", pbuf); 3753 e->e_auth_param = sm_rpool_strdup_x(e->e_rpool, 3754 auth_param); 3755 } 3756 sm_free(auth_param); /* XXX */ 3757 3758 /* reset values */ 3759 Errors = 0; 3760 QuickAbort = saveQuickAbort; 3761 SuprErrs = saveSuprErrs; 3762 ExitStat = saveExitStat; 3763 } 3764 #endif /* SASL */ 3765 #define PRTCHAR(c) ((isascii(c) && isprint(c)) ? (c) : '?') 3766 3767 /* 3768 ** "by" is only accepted if DeliverByMin >= 0. 3769 ** We maybe could add this to the list of server_features. 3770 */ 3771 3772 else if (sm_strcasecmp(kp, "by") == 0 && DeliverByMin >= 0) 3773 { 3774 char *s; 3775 3776 if (vp == NULL) 3777 { 3778 usrerr("501 5.5.2 BY= requires a value"); 3779 /* NOTREACHED */ 3780 } 3781 errno = 0; 3782 e->e_deliver_by = strtol(vp, &s, 10); 3783 if (e->e_deliver_by == LONG_MIN || 3784 e->e_deliver_by == LONG_MAX || 3785 e->e_deliver_by > 999999999l || 3786 e->e_deliver_by < -999999999l) 3787 { 3788 usrerr("501 5.5.2 BY=%s out of range", vp); 3789 /* NOTREACHED */ 3790 } 3791 if (s == NULL || *s != ';') 3792 { 3793 usrerr("501 5.5.2 BY= missing ';'"); 3794 /* NOTREACHED */ 3795 } 3796 e->e_dlvr_flag = 0; 3797 ++s; /* XXX: spaces allowed? */ 3798 SKIP_SPACE(s); 3799 switch (tolower(*s)) 3800 { 3801 case 'n': 3802 e->e_dlvr_flag = DLVR_NOTIFY; 3803 break; 3804 case 'r': 3805 e->e_dlvr_flag = DLVR_RETURN; 3806 if (e->e_deliver_by <= 0) 3807 { 3808 usrerr("501 5.5.4 mode R requires BY time > 0"); 3809 /* NOTREACHED */ 3810 } 3811 if (DeliverByMin > 0 && e->e_deliver_by > 0 && 3812 e->e_deliver_by < DeliverByMin) 3813 { 3814 usrerr("555 5.5.2 time %ld less than %ld", 3815 e->e_deliver_by, (long) DeliverByMin); 3816 /* NOTREACHED */ 3817 } 3818 break; 3819 default: 3820 usrerr("501 5.5.2 illegal by-mode '%c'", PRTCHAR(*s)); 3821 /* NOTREACHED */ 3822 } 3823 ++s; /* XXX: spaces allowed? */ 3824 SKIP_SPACE(s); 3825 switch (tolower(*s)) 3826 { 3827 case 't': 3828 e->e_dlvr_flag |= DLVR_TRACE; 3829 break; 3830 case '\0': 3831 break; 3832 default: 3833 usrerr("501 5.5.2 illegal by-trace '%c'", PRTCHAR(*s)); 3834 /* NOTREACHED */ 3835 } 3836 3837 /* XXX: check whether more characters follow? */ 3838 } 3839 else 3840 { 3841 usrerr("555 5.5.4 %s parameter unrecognized", kp); 3842 /* NOTREACHED */ 3843 } 3844 } 3845 /* 3846 ** RCPT_ESMTP_ARGS -- process ESMTP arguments from RCPT line 3847 ** 3848 ** Parameters: 3849 ** a -- the address corresponding to the To: parameter. 3850 ** kp -- the parameter key. 3851 ** vp -- the value of that parameter. 3852 ** e -- the envelope. 3853 ** 3854 ** Returns: 3855 ** none. 3856 */ 3857 3858 static void 3859 rcpt_esmtp_args(a, kp, vp, e) 3860 ADDRESS *a; 3861 char *kp; 3862 char *vp; 3863 ENVELOPE *e; 3864 { 3865 if (sm_strcasecmp(kp, "notify") == 0) 3866 { 3867 char *p; 3868 3869 if (bitset(PRIV_NORECEIPTS, PrivacyFlags)) 3870 { 3871 usrerr("504 5.7.0 Sorry, NOTIFY not supported, we do not allow DSN"); 3872 /* NOTREACHED */ 3873 } 3874 if (vp == NULL) 3875 { 3876 usrerr("501 5.5.2 NOTIFY requires a value"); 3877 /* NOTREACHED */ 3878 } 3879 a->q_flags &= ~(QPINGONSUCCESS|QPINGONFAILURE|QPINGONDELAY); 3880 a->q_flags |= QHASNOTIFY; 3881 macdefine(&e->e_macro, A_TEMP, macid("{dsn_notify}"), vp); 3882 3883 if (sm_strcasecmp(vp, "never") == 0) 3884 return; 3885 for (p = vp; p != NULL; vp = p) 3886 { 3887 p = strchr(p, ','); 3888 if (p != NULL) 3889 *p++ = '\0'; 3890 if (sm_strcasecmp(vp, "success") == 0) 3891 a->q_flags |= QPINGONSUCCESS; 3892 else if (sm_strcasecmp(vp, "failure") == 0) 3893 a->q_flags |= QPINGONFAILURE; 3894 else if (sm_strcasecmp(vp, "delay") == 0) 3895 a->q_flags |= QPINGONDELAY; 3896 else 3897 { 3898 usrerr("501 5.5.4 Bad argument \"%s\" to NOTIFY", 3899 vp); 3900 /* NOTREACHED */ 3901 } 3902 } 3903 } 3904 else if (sm_strcasecmp(kp, "orcpt") == 0) 3905 { 3906 if (bitset(PRIV_NORECEIPTS, PrivacyFlags)) 3907 { 3908 usrerr("504 5.7.0 Sorry, ORCPT not supported, we do not allow DSN"); 3909 /* NOTREACHED */ 3910 } 3911 if (vp == NULL) 3912 { 3913 usrerr("501 5.5.2 ORCPT requires a value"); 3914 /* NOTREACHED */ 3915 } 3916 if (strchr(vp, ';') == NULL || !xtextok(vp)) 3917 { 3918 usrerr("501 5.5.4 Syntax error in ORCPT parameter value"); 3919 /* NOTREACHED */ 3920 } 3921 if (a->q_orcpt != NULL) 3922 { 3923 usrerr("501 5.5.0 Duplicate ORCPT parameter"); 3924 /* NOTREACHED */ 3925 } 3926 a->q_orcpt = sm_rpool_strdup_x(e->e_rpool, vp); 3927 } 3928 else 3929 { 3930 usrerr("555 5.5.4 %s parameter unrecognized", kp); 3931 /* NOTREACHED */ 3932 } 3933 } 3934 /* 3935 ** PRINTVRFYADDR -- print an entry in the verify queue 3936 ** 3937 ** Parameters: 3938 ** a -- the address to print. 3939 ** last -- set if this is the last one. 3940 ** vrfy -- set if this is a VRFY command. 3941 ** 3942 ** Returns: 3943 ** none. 3944 ** 3945 ** Side Effects: 3946 ** Prints the appropriate 250 codes. 3947 */ 3948 #define OFFF (3 + 1 + 5 + 1) /* offset in fmt: SMTP reply + enh. code */ 3949 3950 static void 3951 printvrfyaddr(a, last, vrfy) 3952 register ADDRESS *a; 3953 bool last; 3954 bool vrfy; 3955 { 3956 char fmtbuf[30]; 3957 3958 if (vrfy && a->q_mailer != NULL && 3959 !bitnset(M_VRFY250, a->q_mailer->m_flags)) 3960 (void) sm_strlcpy(fmtbuf, "252", sizeof fmtbuf); 3961 else 3962 (void) sm_strlcpy(fmtbuf, "250", sizeof fmtbuf); 3963 fmtbuf[3] = last ? ' ' : '-'; 3964 (void) sm_strlcpy(&fmtbuf[4], "2.1.5 ", sizeof fmtbuf - 4); 3965 if (a->q_fullname == NULL) 3966 { 3967 if ((a->q_mailer == NULL || 3968 a->q_mailer->m_addrtype == NULL || 3969 sm_strcasecmp(a->q_mailer->m_addrtype, "rfc822") == 0) && 3970 strchr(a->q_user, '@') == NULL) 3971 (void) sm_strlcpy(&fmtbuf[OFFF], "<%s@%s>", 3972 sizeof fmtbuf - OFFF); 3973 else 3974 (void) sm_strlcpy(&fmtbuf[OFFF], "<%s>", 3975 sizeof fmtbuf - OFFF); 3976 message(fmtbuf, a->q_user, MyHostName); 3977 } 3978 else 3979 { 3980 if ((a->q_mailer == NULL || 3981 a->q_mailer->m_addrtype == NULL || 3982 sm_strcasecmp(a->q_mailer->m_addrtype, "rfc822") == 0) && 3983 strchr(a->q_user, '@') == NULL) 3984 (void) sm_strlcpy(&fmtbuf[OFFF], "%s <%s@%s>", 3985 sizeof fmtbuf - OFFF); 3986 else 3987 (void) sm_strlcpy(&fmtbuf[OFFF], "%s <%s>", 3988 sizeof fmtbuf - OFFF); 3989 message(fmtbuf, a->q_fullname, a->q_user, MyHostName); 3990 } 3991 } 3992 3993 #if SASL 3994 /* 3995 ** SASLMECHS -- get list of possible AUTH mechanisms 3996 ** 3997 ** Parameters: 3998 ** conn -- SASL connection info. 3999 ** mechlist -- output parameter for list of mechanisms. 4000 ** 4001 ** Returns: 4002 ** number of mechs. 4003 */ 4004 4005 static int 4006 saslmechs(conn, mechlist) 4007 sasl_conn_t *conn; 4008 char **mechlist; 4009 { 4010 int len, num, result; 4011 4012 /* "user" is currently unused */ 4013 # if SASL >= 20000 4014 result = sasl_listmech(conn, NULL, 4015 "", " ", "", (const char **) mechlist, 4016 (unsigned int *)&len, &num); 4017 # else /* SASL >= 20000 */ 4018 result = sasl_listmech(conn, "user", /* XXX */ 4019 "", " ", "", mechlist, 4020 (unsigned int *)&len, (unsigned int *)&num); 4021 # endif /* SASL >= 20000 */ 4022 if (result != SASL_OK) 4023 { 4024 if (LogLevel > 9) 4025 sm_syslog(LOG_WARNING, NOQID, 4026 "AUTH error: listmech=%d, num=%d", 4027 result, num); 4028 num = 0; 4029 } 4030 if (num > 0) 4031 { 4032 if (LogLevel > 11) 4033 sm_syslog(LOG_INFO, NOQID, 4034 "AUTH: available mech=%s, allowed mech=%s", 4035 *mechlist, AuthMechanisms); 4036 *mechlist = intersect(AuthMechanisms, *mechlist, NULL); 4037 } 4038 else 4039 { 4040 *mechlist = NULL; /* be paranoid... */ 4041 if (result == SASL_OK && LogLevel > 9) 4042 sm_syslog(LOG_WARNING, NOQID, 4043 "AUTH warning: no mechanisms"); 4044 } 4045 return num; 4046 } 4047 4048 # if SASL >= 20000 4049 /* 4050 ** PROXY_POLICY -- define proxy policy for AUTH 4051 ** 4052 ** Parameters: 4053 ** conn -- unused. 4054 ** context -- unused. 4055 ** requested_user -- authorization identity. 4056 ** rlen -- authorization identity length. 4057 ** auth_identity -- authentication identity. 4058 ** alen -- authentication identity length. 4059 ** def_realm -- default user realm. 4060 ** urlen -- user realm length. 4061 ** propctx -- unused. 4062 ** 4063 ** Returns: 4064 ** ok? 4065 ** 4066 ** Side Effects: 4067 ** sets {auth_authen} macro. 4068 */ 4069 4070 int 4071 proxy_policy(conn, context, requested_user, rlen, auth_identity, alen, 4072 def_realm, urlen, propctx) 4073 sasl_conn_t *conn; 4074 void *context; 4075 const char *requested_user; 4076 unsigned rlen; 4077 const char *auth_identity; 4078 unsigned alen; 4079 const char *def_realm; 4080 unsigned urlen; 4081 struct propctx *propctx; 4082 { 4083 if (auth_identity == NULL) 4084 return SASL_FAIL; 4085 4086 macdefine(&BlankEnvelope.e_macro, A_TEMP, 4087 macid("{auth_authen}"), (char *) auth_identity); 4088 4089 return SASL_OK; 4090 } 4091 # else /* SASL >= 20000 */ 4092 4093 /* 4094 ** PROXY_POLICY -- define proxy policy for AUTH 4095 ** 4096 ** Parameters: 4097 ** context -- unused. 4098 ** auth_identity -- authentication identity. 4099 ** requested_user -- authorization identity. 4100 ** user -- allowed user (output). 4101 ** errstr -- possible error string (output). 4102 ** 4103 ** Returns: 4104 ** ok? 4105 */ 4106 4107 int 4108 proxy_policy(context, auth_identity, requested_user, user, errstr) 4109 void *context; 4110 const char *auth_identity; 4111 const char *requested_user; 4112 const char **user; 4113 const char **errstr; 4114 { 4115 if (user == NULL || auth_identity == NULL) 4116 return SASL_FAIL; 4117 *user = newstr(auth_identity); 4118 return SASL_OK; 4119 } 4120 # endif /* SASL >= 20000 */ 4121 #endif /* SASL */ 4122 4123 #if STARTTLS 4124 /* 4125 ** INITSRVTLS -- initialize server side TLS 4126 ** 4127 ** Parameters: 4128 ** tls_ok -- should tls initialization be done? 4129 ** 4130 ** Returns: 4131 ** succeeded? 4132 ** 4133 ** Side Effects: 4134 ** sets tls_ok_srv which is a static variable in this module. 4135 ** Do NOT remove assignments to it! 4136 */ 4137 4138 bool 4139 initsrvtls(tls_ok) 4140 bool tls_ok; 4141 { 4142 if (!tls_ok) 4143 return false; 4144 4145 /* do NOT remove assignment */ 4146 tls_ok_srv = inittls(&srv_ctx, TLS_Srv_Opts, true, SrvCertFile, 4147 SrvKeyFile, CACertPath, CACertFile, DHParams); 4148 return tls_ok_srv; 4149 } 4150 #endif /* STARTTLS */ 4151 /* 4152 ** SRVFEATURES -- get features for SMTP server 4153 ** 4154 ** Parameters: 4155 ** e -- envelope (should be session context). 4156 ** clientname -- name of client. 4157 ** features -- default features for this invocation. 4158 ** 4159 ** Returns: 4160 ** server features. 4161 */ 4162 4163 /* table with options: it uses just one character, how about strings? */ 4164 static struct 4165 { 4166 char srvf_opt; 4167 unsigned int srvf_flag; 4168 } srv_feat_table[] = 4169 { 4170 { 'A', SRV_OFFER_AUTH }, 4171 { 'B', SRV_OFFER_VERB }, /* FFR; not documented in 8.12 */ 4172 { 'D', SRV_OFFER_DSN }, /* FFR; not documented in 8.12 */ 4173 { 'E', SRV_OFFER_ETRN }, /* FFR; not documented in 8.12 */ 4174 { 'L', SRV_REQ_AUTH }, /* FFR; not documented in 8.12 */ 4175 #if PIPELINING 4176 # if _FFR_NO_PIPE 4177 { 'N', SRV_NO_PIPE }, 4178 # endif /* _FFR_NO_PIPE */ 4179 { 'P', SRV_OFFER_PIPE }, 4180 #endif /* PIPELINING */ 4181 { 'R', SRV_VRFY_CLT }, /* FFR; not documented in 8.12 */ 4182 { 'S', SRV_OFFER_TLS }, 4183 /* { 'T', SRV_TMP_FAIL }, */ 4184 { 'V', SRV_VRFY_CLT }, 4185 { 'X', SRV_OFFER_EXPN }, /* FFR; not documented in 8.12 */ 4186 /* { 'Y', SRV_OFFER_VRFY }, */ 4187 { '\0', SRV_NONE } 4188 }; 4189 4190 static unsigned int 4191 srvfeatures(e, clientname, features) 4192 ENVELOPE *e; 4193 char *clientname; 4194 unsigned int features; 4195 { 4196 int r, i, j; 4197 char **pvp, c, opt; 4198 char pvpbuf[PSBUFSIZE]; 4199 4200 pvp = NULL; 4201 r = rscap("srv_features", clientname, "", e, &pvp, pvpbuf, 4202 sizeof(pvpbuf)); 4203 if (r != EX_OK) 4204 return features; 4205 if (pvp == NULL || pvp[0] == NULL || (pvp[0][0] & 0377) != CANONNET) 4206 return features; 4207 if (pvp[1] != NULL && sm_strncasecmp(pvp[1], "temp", 4) == 0) 4208 return SRV_TMP_FAIL; 4209 4210 /* 4211 ** General rule (see sendmail.h, d_flags): 4212 ** lower case: required/offered, upper case: Not required/available 4213 ** 4214 ** Since we can change some features per daemon, we have both 4215 ** cases here: turn on/off a feature. 4216 */ 4217 4218 for (i = 1; pvp[i] != NULL; i++) 4219 { 4220 c = pvp[i][0]; 4221 j = 0; 4222 for (;;) 4223 { 4224 if ((opt = srv_feat_table[j].srvf_opt) == '\0') 4225 { 4226 if (LogLevel > 9) 4227 sm_syslog(LOG_WARNING, e->e_id, 4228 "srvfeatures: unknown feature %s", 4229 pvp[i]); 4230 break; 4231 } 4232 if (c == opt) 4233 { 4234 features &= ~(srv_feat_table[j].srvf_flag); 4235 break; 4236 } 4237 if (c == tolower(opt)) 4238 { 4239 features |= srv_feat_table[j].srvf_flag; 4240 break; 4241 } 4242 ++j; 4243 } 4244 } 4245 return features; 4246 } 4247 4248 /* 4249 ** HELP -- implement the HELP command. 4250 ** 4251 ** Parameters: 4252 ** topic -- the topic we want help for. 4253 ** e -- envelope. 4254 ** 4255 ** Returns: 4256 ** none. 4257 ** 4258 ** Side Effects: 4259 ** outputs the help file to message output. 4260 */ 4261 #define HELPVSTR "#vers " 4262 #define HELPVERSION 2 4263 4264 void 4265 help(topic, e) 4266 char *topic; 4267 ENVELOPE *e; 4268 { 4269 register SM_FILE_T *hf; 4270 register char *p; 4271 int len; 4272 bool noinfo; 4273 bool first = true; 4274 long sff = SFF_OPENASROOT|SFF_REGONLY; 4275 char buf[MAXLINE]; 4276 char inp[MAXLINE]; 4277 static int foundvers = -1; 4278 extern char Version[]; 4279 4280 if (DontLockReadFiles) 4281 sff |= SFF_NOLOCK; 4282 if (!bitnset(DBS_HELPFILEINUNSAFEDIRPATH, DontBlameSendmail)) 4283 sff |= SFF_SAFEDIRPATH; 4284 4285 if (HelpFile == NULL || 4286 (hf = safefopen(HelpFile, O_RDONLY, 0444, sff)) == NULL) 4287 { 4288 /* no help */ 4289 errno = 0; 4290 message("502 5.3.0 Sendmail %s -- HELP not implemented", 4291 Version); 4292 return; 4293 } 4294 4295 if (topic == NULL || *topic == '\0') 4296 { 4297 topic = "smtp"; 4298 noinfo = false; 4299 } 4300 else 4301 { 4302 makelower(topic); 4303 noinfo = true; 4304 } 4305 4306 len = strlen(topic); 4307 4308 while (sm_io_fgets(hf, SM_TIME_DEFAULT, buf, sizeof buf) != NULL) 4309 { 4310 if (buf[0] == '#') 4311 { 4312 if (foundvers < 0 && 4313 strncmp(buf, HELPVSTR, strlen(HELPVSTR)) == 0) 4314 { 4315 int h; 4316 4317 if (sm_io_sscanf(buf + strlen(HELPVSTR), "%d", 4318 &h) == 1) 4319 foundvers = h; 4320 } 4321 continue; 4322 } 4323 if (strncmp(buf, topic, len) == 0) 4324 { 4325 if (first) 4326 { 4327 first = false; 4328 4329 /* print version if no/old vers# in file */ 4330 if (foundvers < 2 && !noinfo) 4331 message("214-2.0.0 This is Sendmail version %s", Version); 4332 } 4333 p = strpbrk(buf, " \t"); 4334 if (p == NULL) 4335 p = buf + strlen(buf) - 1; 4336 else 4337 p++; 4338 fixcrlf(p, true); 4339 if (foundvers >= 2) 4340 { 4341 translate_dollars(p); 4342 expand(p, inp, sizeof inp, e); 4343 p = inp; 4344 } 4345 message("214-2.0.0 %s", p); 4346 noinfo = false; 4347 } 4348 } 4349 4350 if (noinfo) 4351 message("504 5.3.0 HELP topic \"%.10s\" unknown", topic); 4352 else 4353 message("214 2.0.0 End of HELP info"); 4354 4355 if (foundvers != 0 && foundvers < HELPVERSION) 4356 { 4357 if (LogLevel > 1) 4358 sm_syslog(LOG_WARNING, e->e_id, 4359 "%s too old (require version %d)", 4360 HelpFile, HELPVERSION); 4361 4362 /* avoid log next time */ 4363 foundvers = 0; 4364 } 4365 4366 (void) sm_io_close(hf, SM_TIME_DEFAULT); 4367 } 4368 4369 #if SASL 4370 /* 4371 ** RESET_SASLCONN -- reset SASL connection data 4372 ** 4373 ** Parameters: 4374 ** conn -- SASL connection context 4375 ** hostname -- host name 4376 ** various connection data 4377 ** 4378 ** Returns: 4379 ** SASL result 4380 */ 4381 4382 static int 4383 reset_saslconn(sasl_conn_t ** conn, char *hostname, 4384 # if SASL >= 20000 4385 char *remoteip, char *localip, 4386 char *auth_id, sasl_ssf_t * ext_ssf) 4387 # else /* SASL >= 20000 */ 4388 struct sockaddr_in * saddr_r, struct sockaddr_in * saddr_l, 4389 sasl_external_properties_t * ext_ssf) 4390 # endif /* SASL >= 20000 */ 4391 { 4392 int result; 4393 4394 sasl_dispose(conn); 4395 # if SASL >= 20000 4396 result = sasl_server_new("smtp", hostname, NULL, NULL, NULL, 4397 NULL, 0, conn); 4398 # elif SASL > 10505 4399 /* use empty realm: only works in SASL > 1.5.5 */ 4400 result = sasl_server_new("smtp", hostname, "", NULL, 0, conn); 4401 # else /* SASL >= 20000 */ 4402 /* use no realm -> realm is set to hostname by SASL lib */ 4403 result = sasl_server_new("smtp", hostname, NULL, NULL, 0, 4404 conn); 4405 # endif /* SASL >= 20000 */ 4406 if (result != SASL_OK) 4407 return result; 4408 4409 # if SASL >= 20000 4410 # if NETINET || NETINET6 4411 if (remoteip != NULL) 4412 result = sasl_setprop(*conn, SASL_IPREMOTEPORT, remoteip); 4413 if (result != SASL_OK) 4414 return result; 4415 4416 if (localip != NULL) 4417 result = sasl_setprop(*conn, SASL_IPLOCALPORT, localip); 4418 if (result != SASL_OK) 4419 return result; 4420 # endif /* NETINET || NETINET6 */ 4421 4422 result = sasl_setprop(*conn, SASL_SSF_EXTERNAL, ext_ssf); 4423 if (result != SASL_OK) 4424 return result; 4425 4426 result = sasl_setprop(*conn, SASL_AUTH_EXTERNAL, auth_id); 4427 if (result != SASL_OK) 4428 return result; 4429 # else /* SASL >= 20000 */ 4430 # if NETINET 4431 if (saddr_r != NULL) 4432 result = sasl_setprop(*conn, SASL_IP_REMOTE, saddr_r); 4433 if (result != SASL_OK) 4434 return result; 4435 4436 if (saddr_l != NULL) 4437 result = sasl_setprop(*conn, SASL_IP_LOCAL, saddr_l); 4438 if (result != SASL_OK) 4439 return result; 4440 # endif /* NETINET */ 4441 4442 result = sasl_setprop(*conn, SASL_SSF_EXTERNAL, ext_ssf); 4443 if (result != SASL_OK) 4444 return result; 4445 # endif /* SASL >= 20000 */ 4446 return SASL_OK; 4447 } 4448 #endif /* SASL */ 4449