1 /* $NetBSD: smtp.h,v 1.1.1.4 2014/07/06 19:27:55 tron Exp $ */ 2 3 /*++ 4 /* NAME 5 /* smtp 3h 6 /* SUMMARY 7 /* smtp client program 8 /* SYNOPSIS 9 /* #include "smtp.h" 10 /* DESCRIPTION 11 /* .nf 12 13 /* 14 * System library. 15 */ 16 #include <string.h> 17 18 /* 19 * Utility library. 20 */ 21 #include <vstream.h> 22 #include <vstring.h> 23 #include <argv.h> 24 #include <htable.h> 25 #include <dict.h> 26 27 /* 28 * Global library. 29 */ 30 #include <deliver_request.h> 31 #include <scache.h> 32 #include <string_list.h> 33 #include <maps.h> 34 #include <tok822.h> 35 #include <dsn_buf.h> 36 #include <header_body_checks.h> 37 38 /* 39 * Postfix TLS library. 40 */ 41 #include <tls.h> 42 43 /* 44 * Global iterator support. This is updated by the connection-management 45 * loop, and contains dynamic context that appears in lookup keys for SASL 46 * passwords, TLS policy, cached SMTP connections, and cached TLS session 47 * keys. 48 * 49 * For consistency and maintainability, context that is used in more than one 50 * lookup key is formatted with smtp_key_format(). 51 */ 52 typedef struct SMTP_ITERATOR { 53 /* Public members. */ 54 VSTRING *request_nexthop; /* request nexhop or empty */ 55 VSTRING *dest; /* current nexthop */ 56 VSTRING *host; /* hostname or empty */ 57 VSTRING *addr; /* printable address or empty */ 58 unsigned port; /* network byte order or null */ 59 struct DNS_RR *rr; /* DNS resource record or null */ 60 struct DNS_RR *mx; /* DNS resource record or null */ 61 /* Private members. */ 62 VSTRING *saved_dest; /* saved current nexthop */ 63 struct SMTP_STATE *parent; /* parent linkage */ 64 } SMTP_ITERATOR; 65 66 #define SMTP_ITER_INIT(iter, _dest, _host, _addr, _port, state) do { \ 67 vstring_strcpy((iter)->dest, (_dest)); \ 68 vstring_strcpy((iter)->host, (_host)); \ 69 vstring_strcpy((iter)->addr, (_addr)); \ 70 (iter)->port = (_port); \ 71 (iter)->mx = (iter)->rr = 0; \ 72 vstring_strcpy((iter)->saved_dest, ""); \ 73 (iter)->parent = (state); \ 74 } while (0) 75 76 #define SMTP_ITER_CLOBBER(iter, _dest, _host, _addr) do { \ 77 vstring_strcpy((iter)->dest, (_dest)); \ 78 vstring_strcpy((iter)->host, (_host)); \ 79 vstring_strcpy((iter)->addr, (_addr)); \ 80 } while (0) 81 82 #define SMTP_ITER_SAVE_DEST(iter) do { \ 83 vstring_strcpy((iter)->saved_dest, STR((iter)->dest)); \ 84 } while (0) 85 86 #define SMTP_ITER_RESTORE_DEST(iter) do { \ 87 vstring_strcpy((iter)->dest, STR((iter)->saved_dest)); \ 88 } while (0) 89 90 /* 91 * TLS Policy support. 92 */ 93 #ifdef USE_TLS 94 95 typedef struct SMTP_TLS_POLICY { 96 int level; /* TLS enforcement level */ 97 char *protocols; /* Acceptable SSL protocols */ 98 char *grade; /* Cipher grade: "export", ... */ 99 VSTRING *exclusions; /* Excluded SSL ciphers */ 100 ARGV *matchargv; /* Cert match patterns */ 101 DSN_BUF *why; /* Lookup error status */ 102 TLS_DANE *dane; /* DANE TLSA digests */ 103 } SMTP_TLS_POLICY; 104 105 /* 106 * smtp_tls_policy.c 107 */ 108 extern void smtp_tls_list_init(void); 109 extern int smtp_tls_policy_cache_query(DSN_BUF *, SMTP_TLS_POLICY *, SMTP_ITERATOR *); 110 extern void smtp_tls_policy_cache_flush(void); 111 112 /* 113 * Macros must use distinct names for local temporary variables, otherwise 114 * there will be bugs due to shadowing. This happened when an earlier 115 * version of smtp_tls_policy_dummy() invoked smtp_tls_policy_init(), but it 116 * could also happen without macro nesting. 117 * 118 * General principle: use all or part of the macro name in each temporary 119 * variable name. Then, append suffixes to the names if needed. 120 */ 121 #define smtp_tls_policy_dummy(t) do { \ 122 SMTP_TLS_POLICY *_tls_policy_dummy_tmp = (t); \ 123 smtp_tls_policy_init(_tls_policy_dummy_tmp, (DSN_BUF *) 0); \ 124 _tls_policy_dummy_tmp->level = TLS_LEV_NONE; \ 125 } while (0) 126 127 /* This macro is not part of the module external interface. */ 128 #define smtp_tls_policy_init(t, w) do { \ 129 SMTP_TLS_POLICY *_tls_policy_init_tmp = (t); \ 130 _tls_policy_init_tmp->protocols = 0; \ 131 _tls_policy_init_tmp->grade = 0; \ 132 _tls_policy_init_tmp->exclusions = 0; \ 133 _tls_policy_init_tmp->matchargv = 0; \ 134 _tls_policy_init_tmp->why = (w); \ 135 _tls_policy_init_tmp->dane = 0; \ 136 } while (0) 137 138 #endif 139 140 /* 141 * State information associated with each SMTP delivery request. 142 * Session-specific state is stored separately. 143 */ 144 typedef struct SMTP_STATE { 145 int misc_flags; /* processing flags, see below */ 146 VSTREAM *src; /* queue file stream */ 147 const char *service; /* transport name */ 148 DELIVER_REQUEST *request; /* envelope info, offsets */ 149 struct SMTP_SESSION *session; /* network connection */ 150 int status; /* delivery status */ 151 ssize_t space_left; /* output length control */ 152 153 /* 154 * Global iterator. 155 */ 156 SMTP_ITERATOR iterator[1]; /* Usage: state->iterator->member */ 157 158 /* 159 * Global iterator. 160 */ 161 #ifdef USE_TLS 162 SMTP_TLS_POLICY tls[1]; /* Usage: state->tls->member */ 163 #endif 164 165 /* 166 * Connection cache support. 167 */ 168 HTABLE *cache_used; /* cached addresses that were used */ 169 VSTRING *dest_label; /* cached logical/physical binding */ 170 VSTRING *dest_prop; /* binding properties, passivated */ 171 VSTRING *endp_label; /* cached session physical endpoint */ 172 VSTRING *endp_prop; /* endpoint properties, passivated */ 173 174 /* 175 * Flags and counters to control the handling of mail delivery errors. 176 * There is some redundancy for sanity checking. At the end of an SMTP 177 * session all recipients should be marked one way or the other. 178 */ 179 int rcpt_left; /* recipients left over */ 180 int rcpt_drop; /* recipients marked as drop */ 181 int rcpt_keep; /* recipients marked as keep */ 182 183 /* 184 * DSN Support introduced major bloat in error processing. 185 */ 186 DSN_BUF *why; /* on-the-fly formatting buffer */ 187 } SMTP_STATE; 188 189 /* 190 * TODO: use the new SMTP_ITER name space. 191 */ 192 #define SET_NEXTHOP_STATE(state, nexthop) { \ 193 vstring_strcpy((state)->iterator->request_nexthop, nexthop); \ 194 } 195 196 #define FREE_NEXTHOP_STATE(state) { \ 197 STR((state)->iterator->request_nexthop)[0] = 0; \ 198 } 199 200 #define HAVE_NEXTHOP_STATE(state) (STR((state)->iterator->request_nexthop)[0] != 0) 201 202 203 /* 204 * Server features. 205 */ 206 #define SMTP_FEATURE_ESMTP (1<<0) 207 #define SMTP_FEATURE_8BITMIME (1<<1) 208 #define SMTP_FEATURE_PIPELINING (1<<2) 209 #define SMTP_FEATURE_SIZE (1<<3) 210 #define SMTP_FEATURE_STARTTLS (1<<4) 211 #define SMTP_FEATURE_AUTH (1<<5) 212 #define SMTP_FEATURE_XFORWARD_NAME (1<<7) 213 #define SMTP_FEATURE_XFORWARD_ADDR (1<<8) 214 #define SMTP_FEATURE_XFORWARD_PROTO (1<<9) 215 #define SMTP_FEATURE_XFORWARD_HELO (1<<10) 216 #define SMTP_FEATURE_XFORWARD_DOMAIN (1<<11) 217 #define SMTP_FEATURE_BEST_MX (1<<12) /* for next-hop or fall-back */ 218 #define SMTP_FEATURE_RSET_REJECTED (1<<13) /* RSET probe rejected */ 219 #define SMTP_FEATURE_FROM_CACHE (1<<14) /* cached connection */ 220 #define SMTP_FEATURE_DSN (1<<15) /* DSN supported */ 221 #define SMTP_FEATURE_PIX_NO_ESMTP (1<<16) /* PIX smtp fixup mode */ 222 #define SMTP_FEATURE_PIX_DELAY_DOTCRLF (1<<17) /* PIX smtp fixup mode */ 223 #define SMTP_FEATURE_XFORWARD_PORT (1<<18) 224 #define SMTP_FEATURE_EARLY_TLS_MAIL_REPLY (1<<19) /* CVE-2009-3555 */ 225 #define SMTP_FEATURE_XFORWARD_IDENT (1<<20) 226 227 /* 228 * Features that passivate under the endpoint. 229 */ 230 #define SMTP_FEATURE_ENDPOINT_MASK \ 231 (~(SMTP_FEATURE_BEST_MX | SMTP_FEATURE_RSET_REJECTED \ 232 | SMTP_FEATURE_FROM_CACHE)) 233 234 /* 235 * Features that passivate under the logical destination. 236 */ 237 #define SMTP_FEATURE_DESTINATION_MASK (SMTP_FEATURE_BEST_MX) 238 239 /* 240 * Misc flags. 241 */ 242 #define SMTP_MISC_FLAG_LOOP_DETECT (1<<0) 243 #define SMTP_MISC_FLAG_IN_STARTTLS (1<<1) 244 #define SMTP_MISC_FLAG_FIRST_NEXTHOP (1<<2) 245 #define SMTP_MISC_FLAG_FINAL_NEXTHOP (1<<3) 246 #define SMTP_MISC_FLAG_FINAL_SERVER (1<<4) 247 #define SMTP_MISC_FLAG_CONN_LOAD (1<<5) 248 #define SMTP_MISC_FLAG_CONN_STORE (1<<6) 249 #define SMTP_MISC_FLAG_COMPLETE_SESSION (1<<7) 250 #define SMTP_MISC_FLAG_PREF_IPV6 (1<<8) 251 #define SMTP_MISC_FLAG_PREF_IPV4 (1<<9) 252 253 #define SMTP_MISC_FLAG_CONN_CACHE_MASK \ 254 (SMTP_MISC_FLAG_CONN_LOAD | SMTP_MISC_FLAG_CONN_STORE) 255 256 /* 257 * smtp.c 258 */ 259 #define SMTP_HAS_DSN(why) (STR((why)->status)[0] != 0) 260 #define SMTP_HAS_SOFT_DSN(why) (STR((why)->status)[0] == '4') 261 #define SMTP_HAS_HARD_DSN(why) (STR((why)->status)[0] == '5') 262 #define SMTP_HAS_LOOP_DSN(why) \ 263 (SMTP_HAS_DSN(why) && strcmp(STR((why)->status) + 1, ".4.6") == 0) 264 265 #define SMTP_SET_SOFT_DSN(why) (STR((why)->status)[0] = '4') 266 #define SMTP_SET_HARD_DSN(why) (STR((why)->status)[0] = '5') 267 268 extern int smtp_host_lookup_mask; /* host lookup methods to use */ 269 270 #define SMTP_HOST_FLAG_DNS (1<<0) 271 #define SMTP_HOST_FLAG_NATIVE (1<<1) 272 273 extern int smtp_dns_support; /* dns support level */ 274 275 #define SMTP_DNS_INVALID (-1) /* smtp_dns_support_level = <bogus> */ 276 #define SMTP_DNS_DISABLED 0 /* smtp_dns_support_level = disabled */ 277 #define SMTP_DNS_ENABLED 1 /* smtp_dns_support_level = enabled */ 278 #define SMTP_DNS_DNSSEC 2 /* smtp_dns_support_level = dnssec */ 279 280 extern SCACHE *smtp_scache; /* connection cache instance */ 281 extern STRING_LIST *smtp_cache_dest; /* cached destinations */ 282 283 extern MAPS *smtp_ehlo_dis_maps; /* ehlo keyword filter */ 284 285 extern MAPS *smtp_pix_bug_maps; /* PIX workarounds */ 286 287 extern MAPS *smtp_generic_maps; /* make internal address valid */ 288 extern int smtp_ext_prop_mask; /* address externsion propagation */ 289 extern unsigned smtp_dns_res_opt; /* DNS query flags */ 290 291 #ifdef USE_TLS 292 293 extern TLS_APPL_STATE *smtp_tls_ctx; /* client-side TLS engine */ 294 295 #endif 296 297 extern HBC_CHECKS *smtp_header_checks; /* limited header checks */ 298 extern HBC_CHECKS *smtp_body_checks; /* limited body checks */ 299 300 /* 301 * smtp_session.c 302 */ 303 304 typedef struct SMTP_SESSION { 305 VSTREAM *stream; /* network connection */ 306 SMTP_ITERATOR *iterator; /* dest, host, addr, port */ 307 char *namaddr; /* mail exchanger */ 308 char *helo; /* helo response */ 309 unsigned port; /* network byte order */ 310 char *namaddrport; /* mail exchanger, incl. port */ 311 312 VSTRING *buffer; /* I/O buffer */ 313 VSTRING *scratch; /* scratch buffer */ 314 VSTRING *scratch2; /* scratch buffer */ 315 316 int features; /* server features */ 317 off_t size_limit; /* server limit or unknown */ 318 319 ARGV *history; /* transaction log */ 320 int error_mask; /* error classes */ 321 struct MIME_STATE *mime_state; /* mime state machine */ 322 323 int send_proto_helo; /* XFORWARD support */ 324 325 time_t expire_time; /* session reuse expiration time */ 326 int reuse_count; /* # of times reused (for logging) */ 327 int dead; /* No further I/O allowed */ 328 329 #ifdef USE_SASL_AUTH 330 char *sasl_mechanism_list; /* server mechanism list */ 331 char *sasl_username; /* client username */ 332 char *sasl_passwd; /* client password */ 333 struct XSASL_CLIENT *sasl_client; /* SASL internal state */ 334 VSTRING *sasl_reply; /* client response */ 335 #endif 336 337 /* 338 * TLS related state, don't forget to initialize in session_tls_init()! 339 */ 340 #ifdef USE_TLS 341 TLS_SESS_STATE *tls_context; /* TLS library session state */ 342 char *tls_nexthop; /* Nexthop domain for cert checks */ 343 int tls_retry_plain; /* Try plain when TLS handshake fails */ 344 SMTP_TLS_POLICY *tls; /* TEMPORARY */ 345 #endif 346 347 SMTP_STATE *state; /* back link */ 348 } SMTP_SESSION; 349 350 extern SMTP_SESSION *smtp_session_alloc(VSTREAM *, SMTP_ITERATOR *, time_t, int); 351 extern void smtp_session_new_stream(SMTP_SESSION *, VSTREAM *, time_t, int); 352 extern int smtp_sess_plaintext_ok(SMTP_ITERATOR *, int); 353 extern void smtp_session_free(SMTP_SESSION *); 354 extern int smtp_session_passivate(SMTP_SESSION *, VSTRING *, VSTRING *); 355 extern SMTP_SESSION *smtp_session_activate(int, SMTP_ITERATOR *, VSTRING *, VSTRING *); 356 357 /* 358 * What's in a name? 359 */ 360 #define SMTP_HNAME(rr) (var_smtp_cname_overr ? (rr)->rname : (rr)->qname) 361 362 /* 363 * smtp_connect.c 364 */ 365 extern int smtp_connect(SMTP_STATE *); 366 367 /* 368 * smtp_proto.c 369 */ 370 extern int smtp_helo(SMTP_STATE *); 371 extern int smtp_xfer(SMTP_STATE *); 372 extern int smtp_rset(SMTP_STATE *); 373 extern int smtp_quit(SMTP_STATE *); 374 375 extern HBC_CALL_BACKS smtp_hbc_callbacks[]; 376 377 /* 378 * A connection is re-usable if session->expire_time is > 0 and the 379 * expiration time has not been reached. This is subtle because the timer 380 * can expire between sending a command and receiving the reply for that 381 * command. 382 * 383 * But wait, there is more! When SMTP command pipelining is enabled, there are 384 * two protocol loops that execute at very different times: one loop that 385 * generates commands, and one loop that receives replies to those commands. 386 * These will be called "sender loop" and "receiver loop", respectively. At 387 * well-defined protocol synchronization points, the sender loop pauses to 388 * let the receiver loop catch up. 389 * 390 * When we choose to reuse a connection, both the sender and receiver protocol 391 * loops end with "." (mail delivery) or "RSET" (address probe). When we 392 * choose not to reuse, both the sender and receiver protocol loops end with 393 * "QUIT". The problem is that we must make the same protocol choices in 394 * both the sender and receiver loops, even though those loops may execute 395 * at completely different times. 396 * 397 * We "freeze" the choice in the sender loop, just before we generate "." or 398 * "RSET". The reader loop leaves the connection cachable even if the timer 399 * expires by the time the response arrives. The connection cleanup code 400 * will call smtp_quit() for connections with an expired cache expiration 401 * timer. 402 * 403 * We could have made the programmer's life a lot simpler by not making a 404 * choice at all, and always leaving it up to the connection cleanup code to 405 * call smtp_quit() for connections with an expired cache expiration timer. 406 * 407 * As a general principle, neither the sender loop nor the receiver loop must 408 * modify the connection caching state, if that can affect the receiver 409 * state machine for not-yet processed replies to already-generated 410 * commands. This restriction does not apply when we have to exit the 411 * protocol loops prematurely due to e.g., timeout or connection loss, so 412 * that those pending replies will never be received. 413 * 414 * But wait, there is even more! Only the first good connection for a specific 415 * destination may be cached under both the next-hop destination name and 416 * the server address; connections to alternate servers must be cached under 417 * the server address alone. This means we must distinguish between bad 418 * connections and other reasons why connections cannot be cached. 419 */ 420 #define THIS_SESSION_IS_CACHED \ 421 (!THIS_SESSION_IS_DEAD && session->expire_time > 0) 422 423 #define THIS_SESSION_IS_EXPIRED \ 424 (THIS_SESSION_IS_CACHED \ 425 && (session->expire_time < vstream_ftime(session->stream) \ 426 || (var_smtp_reuse_count > 0 \ 427 && session->reuse_count >= var_smtp_reuse_count))) 428 429 #define THIS_SESSION_IS_BAD \ 430 (!THIS_SESSION_IS_DEAD && session->expire_time < 0) 431 432 #define THIS_SESSION_IS_DEAD \ 433 (session->dead != 0) 434 435 /* Bring the bad news. */ 436 437 #define DONT_CACHE_THIS_SESSION \ 438 (session->expire_time = 0) 439 440 #define DONT_CACHE_BAD_SESSION \ 441 (session->expire_time = -1) 442 443 #define DONT_USE_DEAD_SESSION \ 444 (session->dead = 1) 445 446 /* Initialization. */ 447 448 #define USE_NEWBORN_SESSION \ 449 (session->dead = 0) 450 451 #define CACHE_THIS_SESSION_UNTIL(when) \ 452 (session->expire_time = (when)) 453 454 /* 455 * Encapsulate the following so that we don't expose details of of 456 * connection management and error handling to the SMTP protocol engine. 457 */ 458 #define RETRY_AS_PLAINTEXT do { \ 459 session->tls_retry_plain = 1; \ 460 state->misc_flags &= ~SMTP_MISC_FLAG_FINAL_SERVER; \ 461 } while (0) 462 463 /* 464 * smtp_chat.c 465 */ 466 typedef struct SMTP_RESP { /* server response */ 467 int code; /* SMTP code */ 468 const char *dsn; /* enhanced status */ 469 char *str; /* full reply */ 470 VSTRING *dsn_buf; /* status buffer */ 471 VSTRING *str_buf; /* reply buffer */ 472 } SMTP_RESP; 473 474 extern void PRINTFLIKE(2, 3) smtp_chat_cmd(SMTP_SESSION *, const char *,...); 475 extern DICT *smtp_chat_resp_filter; 476 extern SMTP_RESP *smtp_chat_resp(SMTP_SESSION *); 477 extern void smtp_chat_init(SMTP_SESSION *); 478 extern void smtp_chat_reset(SMTP_SESSION *); 479 extern void smtp_chat_notify(SMTP_SESSION *); 480 481 #define SMTP_RESP_FAKE(resp, _dsn) \ 482 ((resp)->code = 0, \ 483 (resp)->dsn = (_dsn), \ 484 (resp)->str = DSN_BY_LOCAL_MTA, \ 485 (resp)) 486 487 #define DSN_BY_LOCAL_MTA ((char *) 0) /* DSN issued by local MTA */ 488 489 /* 490 * These operations implement a redundant mark-and-sweep algorithm that 491 * explicitly accounts for the fate of every recipient. The interface is 492 * documented in smtp_rcpt.c, which also implements the sweeping. The 493 * smtp_trouble.c module does most of the marking after failure. 494 * 495 * When a delivery fails or succeeds, take one of the following actions: 496 * 497 * - Mark the recipient as KEEP (deliver to alternate MTA) and do not update 498 * the delivery request status. 499 * 500 * - Mark the recipient as DROP (remove from delivery request), log whether 501 * delivery succeeded or failed, delete the recipient from the queue file 502 * and/or update defer or bounce logfiles, and update the delivery request 503 * status. 504 * 505 * At the end of a delivery attempt, all recipients must be marked one way or 506 * the other. Failure to do so will trigger a panic. 507 */ 508 #define SMTP_RCPT_STATE_KEEP 1 /* send to backup host */ 509 #define SMTP_RCPT_STATE_DROP 2 /* remove from request */ 510 #define SMTP_RCPT_INIT(state) do { \ 511 (state)->rcpt_drop = (state)->rcpt_keep = 0; \ 512 (state)->rcpt_left = state->request->rcpt_list.len; \ 513 } while (0) 514 515 #define SMTP_RCPT_DROP(state, rcpt) do { \ 516 (rcpt)->u.status = SMTP_RCPT_STATE_DROP; (state)->rcpt_drop++; \ 517 } while (0) 518 519 #define SMTP_RCPT_KEEP(state, rcpt) do { \ 520 (rcpt)->u.status = SMTP_RCPT_STATE_KEEP; (state)->rcpt_keep++; \ 521 } while (0) 522 523 #define SMTP_RCPT_ISMARKED(rcpt) ((rcpt)->u.status != 0) 524 525 #define SMTP_RCPT_LEFT(state) (state)->rcpt_left 526 527 extern void smtp_rcpt_cleanup(SMTP_STATE *); 528 extern void smtp_rcpt_done(SMTP_STATE *, SMTP_RESP *, RECIPIENT *); 529 530 /* 531 * smtp_trouble.c 532 */ 533 extern int smtp_sess_fail(SMTP_STATE *); 534 extern int PRINTFLIKE(4, 5) smtp_site_fail(SMTP_STATE *, const char *, 535 SMTP_RESP *, const char *,...); 536 extern int PRINTFLIKE(4, 5) smtp_mesg_fail(SMTP_STATE *, const char *, 537 SMTP_RESP *, const char *,...); 538 extern void PRINTFLIKE(5, 6) smtp_rcpt_fail(SMTP_STATE *, RECIPIENT *, 539 const char *, SMTP_RESP *, 540 const char *,...); 541 extern int smtp_stream_except(SMTP_STATE *, int, const char *); 542 543 /* 544 * smtp_unalias.c 545 */ 546 extern const char *smtp_unalias_name(const char *); 547 extern VSTRING *smtp_unalias_addr(VSTRING *, const char *); 548 549 /* 550 * smtp_state.c 551 */ 552 extern SMTP_STATE *smtp_state_alloc(void); 553 extern void smtp_state_free(SMTP_STATE *); 554 555 /* 556 * smtp_map11.c 557 */ 558 extern int smtp_map11_external(VSTRING *, MAPS *, int); 559 extern int smtp_map11_tree(TOK822 *, MAPS *, int); 560 extern int smtp_map11_internal(VSTRING *, MAPS *, int); 561 562 /* 563 * smtp_key.c 564 */ 565 char *smtp_key_prefix(VSTRING *, const char *, SMTP_ITERATOR *, int); 566 567 #define SMTP_KEY_FLAG_SERVICE (1<<0) /* service name */ 568 #define SMTP_KEY_FLAG_SENDER (1<<1) /* sender address */ 569 #define SMTP_KEY_FLAG_REQ_NEXTHOP (1<<2) /* request nexthop */ 570 #define SMTP_KEY_FLAG_NEXTHOP (1<<3) /* current nexthop */ 571 #define SMTP_KEY_FLAG_HOSTNAME (1<<4) /* remote host name */ 572 #define SMTP_KEY_FLAG_ADDR (1<<5) /* remote address */ 573 #define SMTP_KEY_FLAG_PORT (1<<6) /* remote port */ 574 575 #define SMTP_KEY_MASK_ALL \ 576 (SMTP_KEY_FLAG_SERVICE | SMTP_KEY_FLAG_SENDER | \ 577 SMTP_KEY_FLAG_REQ_NEXTHOP | \ 578 SMTP_KEY_FLAG_NEXTHOP | SMTP_KEY_FLAG_HOSTNAME | \ 579 SMTP_KEY_FLAG_ADDR | SMTP_KEY_FLAG_PORT) 580 581 /* 582 * Conditional lookup-key flags for cached connections that may be 583 * SASL-authenticated with a per-{sender, nexthop, or hostname} credential. 584 * Each bit corresponds to one type of smtp_sasl_password_file lookup key, 585 * and is turned on only when the corresponding main.cf parameter is turned 586 * on. 587 */ 588 #define COND_SASL_SMTP_KEY_FLAG_SENDER \ 589 ((var_smtp_sender_auth && *var_smtp_sasl_passwd) ? \ 590 SMTP_KEY_FLAG_SENDER : 0) 591 592 #define COND_SASL_SMTP_KEY_FLAG_NEXTHOP \ 593 (*var_smtp_sasl_passwd ? SMTP_KEY_FLAG_NEXTHOP : 0) 594 595 #define COND_SASL_SMTP_KEY_FLAG_HOSTNAME \ 596 (*var_smtp_sasl_passwd ? SMTP_KEY_FLAG_HOSTNAME : 0) 597 598 /* 599 * Connection-cache destination lookup key. The SENDER attribute is a proxy 600 * for sender-dependent SASL credentials (or absence thereof), and prevents 601 * false connection sharing when different SASL credentials may be required 602 * for different deliveries to the same domain and port. The SERVICE 603 * attribute is a proxy for all request-independent configuration details. 604 */ 605 #define SMTP_KEY_MASK_SCACHE_DEST_LABEL \ 606 (SMTP_KEY_FLAG_SERVICE | COND_SASL_SMTP_KEY_FLAG_SENDER \ 607 | SMTP_KEY_FLAG_REQ_NEXTHOP) 608 609 /* 610 * Connection-cache endpoint lookup key. The SENDER, NEXTHOP, and HOSTNAME 611 * attributes are proxies for SASL credentials (or absence thereof), and 612 * prevent false connection sharing when different SASL credentials may be 613 * required for different deliveries to the same IP address and port. 614 */ 615 #define SMTP_KEY_MASK_SCACHE_ENDP_LABEL \ 616 (SMTP_KEY_FLAG_SERVICE | COND_SASL_SMTP_KEY_FLAG_SENDER \ 617 | COND_SASL_SMTP_KEY_FLAG_NEXTHOP | COND_SASL_SMTP_KEY_FLAG_HOSTNAME \ 618 | SMTP_KEY_FLAG_ADDR | SMTP_KEY_FLAG_PORT) 619 620 /* 621 * Silly little macros. 622 */ 623 #define STR(s) vstring_str(s) 624 #define LEN(s) VSTRING_LEN(s) 625 626 extern int smtp_mode; 627 628 #define SMTP_X(x) (smtp_mode ? VAR_SMTP_##x : VAR_LMTP_##x) 629 #define X_SMTP(x) (smtp_mode ? x##_SMTP : x##_LMTP) 630 631 /* LICENSE 632 /* .ad 633 /* .fi 634 /* The Secure Mailer license must be distributed with this software. 635 /* AUTHOR(S) 636 /* Wietse Venema 637 /* IBM T.J. Watson Research 638 /* P.O. Box 704 639 /* Yorktown Heights, NY 10598, USA 640 /* 641 /* TLS support originally by: 642 /* Lutz Jaenicke 643 /* BTU Cottbus 644 /* Allgemeine Elektrotechnik 645 /* Universitaetsplatz 3-4 646 /* D-03044 Cottbus, Germany 647 /* 648 /* Victor Duchovni 649 /* Morgan Stanley 650 /*--*/ 651