1 /* $NetBSD: tlsproxy.c,v 1.1.1.4 2013/09/25 19:06:36 tron Exp $ */ 2 3 /*++ 4 /* NAME 5 /* tlsproxy 8 6 /* SUMMARY 7 /* Postfix TLS proxy 8 /* SYNOPSIS 9 /* \fBtlsproxy\fR [generic Postfix daemon options] 10 /* DESCRIPTION 11 /* The \fBtlsproxy\fR(8) server implements a server-side TLS 12 /* proxy. It is used by \fBpostscreen\fR(8) to talk SMTP-over-TLS 13 /* with remote SMTP clients that are not whitelisted (including 14 /* clients whose whitelist status has expired), 15 /* but it should also work for non-SMTP protocols. 16 /* 17 /* Although one \fBtlsproxy\fR(8) process can serve multiple 18 /* sessions at the same time, it is a good idea to allow the 19 /* number of processes to increase with load, so that the 20 /* service remains responsive. 21 /* PROTOCOL EXAMPLE 22 /* .ad 23 /* .fi 24 /* The example below concerns \fBpostscreen\fR(8). However, 25 /* the \fBtlsproxy\fR(8) server is agnostic of the application 26 /* protocol, and the example is easily adapted to other 27 /* applications. 28 /* 29 /* After receiving a valid remote SMTP client STARTTLS command, 30 /* the \fBpostscreen\fR(8) server sends the remote SMTP client 31 /* endpoint string, the requested role (server), and the 32 /* requested timeout to \fBtlsproxy\fR(8). \fBpostscreen\fR(8) 33 /* then receives a "TLS available" indication from \fBtlsproxy\fR(8). 34 /* If the TLS service is available, \fBpostscreen\fR(8) sends 35 /* the remote SMTP client file descriptor to \fBtlsproxy\fR(8), 36 /* and sends the plaintext 220 greeting to the remote SMTP 37 /* client. This triggers TLS negotiations between the remote 38 /* SMTP client and \fBtlsproxy\fR(8). Upon completion of the 39 /* TLS-level handshake, \fBtlsproxy\fR(8) translates between 40 /* plaintext from/to \fBpostscreen\fR(8) and ciphertext to/from 41 /* the remote SMTP client. 42 /* SECURITY 43 /* .ad 44 /* .fi 45 /* The \fBtlsproxy\fR(8) server is moderately security-sensitive. 46 /* It talks to untrusted clients on the network. The process 47 /* can be run chrooted at fixed low privilege. 48 /* DIAGNOSTICS 49 /* Problems and transactions are logged to \fBsyslogd\fR(8). 50 /* CONFIGURATION PARAMETERS 51 /* .ad 52 /* .fi 53 /* Changes to \fBmain.cf\fR are not picked up automatically, 54 /* as \fBtlsproxy\fR(8) processes may run for a long time 55 /* depending on mail server load. Use the command "\fBpostfix 56 /* reload\fR" to speed up a change. 57 /* 58 /* The text below provides only a parameter summary. See 59 /* \fBpostconf\fR(5) for more details including examples. 60 /* STARTTLS SUPPORT CONTROLS 61 /* .ad 62 /* .fi 63 /* .IP "\fBtlsproxy_tls_CAfile ($smtpd_tls_CAfile)\fR" 64 /* A file containing (PEM format) CA certificates of root CAs 65 /* trusted to sign either remote SMTP client certificates or intermediate 66 /* CA certificates. 67 /* .IP "\fBtlsproxy_tls_CApath ($smtpd_tls_CApath)\fR" 68 /* A directory containing (PEM format) CA certificates of root CAs 69 /* trusted to sign either remote SMTP client certificates or intermediate 70 /* CA certificates. 71 /* .IP "\fBtlsproxy_tls_always_issue_session_ids ($smtpd_tls_always_issue_session_ids)\fR" 72 /* Force the Postfix \fBtlsproxy\fR(8) server to issue a TLS session id, 73 /* even when TLS session caching is turned off. 74 /* .IP "\fBtlsproxy_tls_ask_ccert ($smtpd_tls_ask_ccert)\fR" 75 /* Ask a remote SMTP client for a client certificate. 76 /* .IP "\fBtlsproxy_tls_ccert_verifydepth ($smtpd_tls_ccert_verifydepth)\fR" 77 /* The verification depth for remote SMTP client certificates. 78 /* .IP "\fBtlsproxy_tls_cert_file ($smtpd_tls_cert_file)\fR" 79 /* File with the Postfix \fBtlsproxy\fR(8) server RSA certificate in PEM 80 /* format. 81 /* .IP "\fBtlsproxy_tls_ciphers ($smtpd_tls_ciphers)\fR" 82 /* The minimum TLS cipher grade that the Postfix \fBtlsproxy\fR(8) server 83 /* will use with opportunistic TLS encryption. 84 /* .IP "\fBtlsproxy_tls_dcert_file ($smtpd_tls_dcert_file)\fR" 85 /* File with the Postfix \fBtlsproxy\fR(8) server DSA certificate in PEM 86 /* format. 87 /* .IP "\fBtlsproxy_tls_dh1024_param_file ($smtpd_tls_dh1024_param_file)\fR" 88 /* File with DH parameters that the Postfix \fBtlsproxy\fR(8) server 89 /* should use with EDH ciphers. 90 /* .IP "\fBtlsproxy_tls_dh512_param_file ($smtpd_tls_dh512_param_file)\fR" 91 /* File with DH parameters that the Postfix \fBtlsproxy\fR(8) server 92 /* should use with EDH ciphers. 93 /* .IP "\fBtlsproxy_tls_dkey_file ($smtpd_tls_dkey_file)\fR" 94 /* File with the Postfix \fBtlsproxy\fR(8) server DSA private key in PEM 95 /* format. 96 /* .IP "\fBtlsproxy_tls_eccert_file ($smtpd_tls_eccert_file)\fR" 97 /* File with the Postfix \fBtlsproxy\fR(8) server ECDSA certificate in 98 /* PEM format. 99 /* .IP "\fBtlsproxy_tls_eckey_file ($smtpd_tls_eckey_file)\fR" 100 /* File with the Postfix \fBtlsproxy\fR(8) server ECDSA private key in 101 /* PEM format. 102 /* .IP "\fBtlsproxy_tls_eecdh_grade ($smtpd_tls_eecdh_grade)\fR" 103 /* The Postfix \fBtlsproxy\fR(8) server security grade for ephemeral 104 /* elliptic-curve Diffie-Hellman (EECDH) key exchange. 105 /* .IP "\fBtlsproxy_tls_exclude_ciphers ($smtpd_tls_exclude_ciphers)\fR" 106 /* List of ciphers or cipher types to exclude from the \fBtlsproxy\fR(8) 107 /* server cipher list at all TLS security levels. 108 /* .IP "\fBtlsproxy_tls_fingerprint_digest ($smtpd_tls_fingerprint_digest)\fR" 109 /* The message digest algorithm to construct remote SMTP 110 /* client-certificate 111 /* fingerprints. 112 /* .IP "\fBtlsproxy_tls_key_file ($smtpd_tls_key_file)\fR" 113 /* File with the Postfix \fBtlsproxy\fR(8) server RSA private key in PEM 114 /* format. 115 /* .IP "\fBtlsproxy_tls_loglevel ($smtpd_tls_loglevel)\fR" 116 /* Enable additional Postfix \fBtlsproxy\fR(8) server logging of TLS 117 /* activity. 118 /* .IP "\fBtlsproxy_tls_mandatory_ciphers ($smtpd_tls_mandatory_ciphers)\fR" 119 /* The minimum TLS cipher grade that the Postfix \fBtlsproxy\fR(8) server 120 /* will use with mandatory TLS encryption. 121 /* .IP "\fBtlsproxy_tls_mandatory_exclude_ciphers ($smtpd_tls_mandatory_exclude_ciphers)\fR" 122 /* Additional list of ciphers or cipher types to exclude from the 123 /* \fBtlsproxy\fR(8) server cipher list at mandatory TLS security levels. 124 /* .IP "\fBtlsproxy_tls_mandatory_protocols ($smtpd_tls_mandatory_protocols)\fR" 125 /* The SSL/TLS protocols accepted by the Postfix \fBtlsproxy\fR(8) server 126 /* with mandatory TLS encryption. 127 /* .IP "\fBtlsproxy_tls_protocols ($smtpd_tls_protocols)\fR" 128 /* List of TLS protocols that the Postfix \fBtlsproxy\fR(8) server will 129 /* exclude or include with opportunistic TLS encryption. 130 /* .IP "\fBtlsproxy_tls_req_ccert ($smtpd_tls_req_ccert)\fR" 131 /* With mandatory TLS encryption, require a trusted remote SMTP 132 /* client certificate in order to allow TLS connections to proceed. 133 /* .IP "\fBtlsproxy_tls_security_level ($smtpd_tls_security_level)\fR" 134 /* The SMTP TLS security level for the Postfix \fBtlsproxy\fR(8) server; 135 /* when a non-empty value is specified, this overrides the obsolete 136 /* parameters smtpd_use_tls and smtpd_enforce_tls. 137 /* .IP "\fBtlsproxy_tls_session_cache_timeout ($smtpd_tls_session_cache_timeout)\fR" 138 /* The expiration time of Postfix \fBtlsproxy\fR(8) server TLS session 139 /* cache information. 140 /* OBSOLETE STARTTLS SUPPORT CONTROLS 141 /* .ad 142 /* .fi 143 /* These parameters are supported for compatibility with 144 /* \fBsmtpd\fR(8) legacy parameters. 145 /* .IP "\fBtlsproxy_use_tls ($smtpd_use_tls)\fR" 146 /* Opportunistic TLS: announce STARTTLS support to remote SMTP clients, 147 /* but do not require that clients use TLS encryption. 148 /* .IP "\fBtlsproxy_enforce_tls ($smtpd_enforce_tls)\fR" 149 /* Mandatory TLS: announce STARTTLS support to remote SMTP clients, and 150 /* require that clients use TLS encryption. 151 /* RESOURCE CONTROLS 152 /* .ad 153 /* .fi 154 /* .IP "\fBtlsproxy_watchdog_timeout (10s)\fR" 155 /* How much time a \fBtlsproxy\fR(8) process may take to process local 156 /* or remote I/O before it is terminated by a built-in watchdog timer. 157 /* MISCELLANEOUS CONTROLS 158 /* .ad 159 /* .fi 160 /* .IP "\fBconfig_directory (see 'postconf -d' output)\fR" 161 /* The default location of the Postfix main.cf and master.cf 162 /* configuration files. 163 /* .IP "\fBprocess_id (read-only)\fR" 164 /* The process ID of a Postfix command or daemon process. 165 /* .IP "\fBprocess_name (read-only)\fR" 166 /* The process name of a Postfix command or daemon process. 167 /* .IP "\fBsyslog_facility (mail)\fR" 168 /* The syslog facility of Postfix logging. 169 /* .IP "\fBsyslog_name (see 'postconf -d' output)\fR" 170 /* The mail system name that is prepended to the process name in syslog 171 /* records, so that "smtpd" becomes, for example, "postfix/smtpd". 172 /* SEE ALSO 173 /* postscreen(8), Postfix zombie blocker 174 /* smtpd(8), Postfix SMTP server 175 /* postconf(5), configuration parameters 176 /* syslogd(5), system logging 177 /* LICENSE 178 /* .ad 179 /* .fi 180 /* The Secure Mailer license must be distributed with this software. 181 /* HISTORY 182 /* .ad 183 /* .fi 184 /* This service was introduced with Postfix version 2.8. 185 /* AUTHOR(S) 186 /* Wietse Venema 187 /* IBM T.J. Watson Research 188 /* P.O. Box 704 189 /* Yorktown Heights, NY 10598, USA 190 /*--*/ 191 192 /* 193 * System library. 194 */ 195 #include <sys_defs.h> 196 197 /* 198 * Utility library. 199 */ 200 #include <msg.h> 201 #include <vstream.h> 202 #include <iostuff.h> 203 #include <nbbio.h> 204 #include <mymalloc.h> 205 206 /* 207 * Global library. 208 */ 209 #include <mail_proto.h> 210 #include <mail_params.h> 211 #include <mail_conf.h> 212 #include <mail_version.h> 213 214 /* 215 * Master library. 216 */ 217 #include <mail_server.h> 218 219 /* 220 * TLS library. 221 */ 222 #ifdef USE_TLS 223 #define TLS_INTERNAL /* XXX */ 224 #include <tls.h> 225 #include <tls_proxy.h> 226 227 /* 228 * Application-specific. 229 */ 230 #include <tlsproxy.h> 231 232 /* 233 * Tunable parameters. We define our clones of the smtpd(8) parameters to 234 * avoid any confusion about which parameters are used by this program. 235 */ 236 int var_smtpd_tls_ccert_vd; 237 char *var_smtpd_tls_loglevel; 238 int var_smtpd_tls_scache_timeout; 239 bool var_smtpd_use_tls; 240 bool var_smtpd_enforce_tls; 241 bool var_smtpd_tls_ask_ccert; 242 bool var_smtpd_tls_req_ccert; 243 bool var_smtpd_tls_set_sessid; 244 char *var_smtpd_relay_ccerts; 245 char *var_smtpd_tls_cert_file; 246 char *var_smtpd_tls_key_file; 247 char *var_smtpd_tls_dcert_file; 248 char *var_smtpd_tls_dkey_file; 249 char *var_smtpd_tls_eccert_file; 250 char *var_smtpd_tls_eckey_file; 251 char *var_smtpd_tls_CAfile; 252 char *var_smtpd_tls_CApath; 253 char *var_smtpd_tls_ciph; 254 char *var_smtpd_tls_mand_ciph; 255 char *var_smtpd_tls_excl_ciph; 256 char *var_smtpd_tls_mand_excl; 257 char *var_smtpd_tls_proto; 258 char *var_smtpd_tls_mand_proto; 259 char *var_smtpd_tls_dh512_param_file; 260 char *var_smtpd_tls_dh1024_param_file; 261 char *var_smtpd_tls_eecdh; 262 char *var_smtpd_tls_fpt_dgst; 263 char *var_smtpd_tls_level; 264 265 int var_tlsp_tls_ccert_vd; 266 char *var_tlsp_tls_loglevel; 267 int var_tlsp_tls_scache_timeout; 268 bool var_tlsp_use_tls; 269 bool var_tlsp_enforce_tls; 270 bool var_tlsp_tls_ask_ccert; 271 bool var_tlsp_tls_req_ccert; 272 bool var_tlsp_tls_set_sessid; 273 char *var_tlsp_tls_cert_file; 274 char *var_tlsp_tls_key_file; 275 char *var_tlsp_tls_dcert_file; 276 char *var_tlsp_tls_dkey_file; 277 char *var_tlsp_tls_eccert_file; 278 char *var_tlsp_tls_eckey_file; 279 char *var_tlsp_tls_CAfile; 280 char *var_tlsp_tls_CApath; 281 char *var_tlsp_tls_ciph; 282 char *var_tlsp_tls_mand_ciph; 283 char *var_tlsp_tls_excl_ciph; 284 char *var_tlsp_tls_mand_excl; 285 char *var_tlsp_tls_proto; 286 char *var_tlsp_tls_mand_proto; 287 char *var_tlsp_tls_dh512_param_file; 288 char *var_tlsp_tls_dh1024_param_file; 289 char *var_tlsp_tls_eecdh; 290 char *var_tlsp_tls_fpt_dgst; 291 char *var_tlsp_tls_level; 292 293 int var_tlsp_watchdog; 294 295 /* 296 * TLS per-process status. 297 */ 298 static TLS_APPL_STATE *tlsp_server_ctx; 299 static int ask_client_cert; 300 301 /* 302 * SLMs. 303 */ 304 #define STR(x) vstring_str(x) 305 306 /* 307 * This code looks simpler than expected. That is the result of a great deal 308 * of effort, mainly in design and analysis. 309 * 310 * By design, postscreen(8) is an event-driven server that must scale up to a 311 * large number of clients. This means that postscreen(8) must avoid doing 312 * CPU-intensive operations such as those in OpenSSL. 313 * 314 * tlsproxy(8) runs the OpenSSL code on behalf of postscreen(8), translating 315 * plaintext SMTP messages from postscreen(8) into SMTP-over-TLS messages to 316 * the remote SMTP client, and vice versa. As long as postscreen(8) does not 317 * receive email messages, the cost of doing TLS operations will be modest. 318 * 319 * Like postscreen(8), one tlsproxy(8) process services multiple remote SMTP 320 * clients. Unlike postscreen(8), there can be more than one tlsproxy(8) 321 * process, although their number is meant to be much smaller than the 322 * number of remote SMTP clients that talk TLS. 323 * 324 * As with postscreen(8), all I/O must be event-driven: encrypted traffic 325 * between tlsproxy(8) and remote SMTP clients, and plaintext traffic 326 * between tlsproxy(8) and postscreen(8). Event-driven plaintext I/O is 327 * straightforward enough that it could be abstracted away with the nbbio(3) 328 * module. 329 * 330 * The event-driven TLS I/O implementation is founded on on-line OpenSSL 331 * documentation, supplemented by statements from OpenSSL developers on 332 * public mailing lists. After some field experience with this code, we may 333 * be able to factor it out as a library module, like nbbio(3), that can 334 * become part of the TLS library. 335 */ 336 337 static void tlsp_ciphertext_event(int, char *); 338 339 #define TLSP_INIT_TIMEOUT 100 340 341 /* tlsp_drain - delayed exit after "postfix reload" */ 342 343 static void tlsp_drain(char *unused_service, char **unused_argv) 344 { 345 int count; 346 347 /* 348 * After "postfix reload", complete work-in-progress in the background, 349 * instead of dropping already-accepted connections on the floor. 350 * 351 * All error retry counts shall be limited. Instead of blocking here, we 352 * could retry failed fork() operations in the event call-back routines, 353 * but we don't need perfection. The host system is severely overloaded 354 * and service levels are already way down. 355 */ 356 for (count = 0; /* see below */ ; count++) { 357 if (count >= 5) { 358 msg_fatal("fork: %m"); 359 } else if (event_server_drain() != 0) { 360 msg_warn("fork: %m"); 361 sleep(1); 362 continue; 363 } else { 364 return; 365 } 366 } 367 } 368 369 /* tlsp_eval_tls_error - translate TLS "error" result into action */ 370 371 static int tlsp_eval_tls_error(TLSP_STATE *state, int err) 372 { 373 int ciphertext_fd = state->ciphertext_fd; 374 375 /* 376 * The ciphertext file descriptor is in non-blocking mode, meaning that 377 * each SSL_accept/connect/read/write/shutdown request may return an 378 * "error" indication that it needs to read or write more ciphertext. The 379 * purpose of this routine is to translate those "error" indications into 380 * the appropriate read/write/timeout event requests. 381 */ 382 switch (err) { 383 384 /* 385 * No error from SSL_read and SSL_write means that the plaintext 386 * output buffer is full and that the plaintext input buffer is 387 * empty. Stop read/write events on the ciphertext stream. Keep the 388 * timer alive as a safety mechanism for the case that the plaintext 389 * pseudothreads get stuck. 390 */ 391 case SSL_ERROR_NONE: 392 if (state->ssl_last_err != SSL_ERROR_NONE) { 393 event_disable_readwrite(ciphertext_fd); 394 event_request_timer(tlsp_ciphertext_event, (char *) state, 395 state->timeout); 396 state->ssl_last_err = SSL_ERROR_NONE; 397 } 398 return (0); 399 400 /* 401 * The TLS engine wants to write to the network. Turn on 402 * write/timeout events on the ciphertext stream. 403 */ 404 case SSL_ERROR_WANT_WRITE: 405 if (state->ssl_last_err == SSL_ERROR_WANT_READ) 406 event_disable_readwrite(ciphertext_fd); 407 if (state->ssl_last_err != SSL_ERROR_WANT_WRITE) { 408 event_enable_write(ciphertext_fd, tlsp_ciphertext_event, 409 (char *) state); 410 state->ssl_last_err = SSL_ERROR_WANT_WRITE; 411 } 412 event_request_timer(tlsp_ciphertext_event, (char *) state, 413 state->timeout); 414 return (0); 415 416 /* 417 * The TLS engine wants to read from the network. Turn on 418 * read/timeout events on the ciphertext stream. 419 */ 420 case SSL_ERROR_WANT_READ: 421 if (state->ssl_last_err == SSL_ERROR_WANT_WRITE) 422 event_disable_readwrite(ciphertext_fd); 423 if (state->ssl_last_err != SSL_ERROR_WANT_READ) { 424 event_enable_read(ciphertext_fd, tlsp_ciphertext_event, 425 (char *) state); 426 state->ssl_last_err = SSL_ERROR_WANT_READ; 427 } 428 event_request_timer(tlsp_ciphertext_event, (char *) state, 429 state->timeout); 430 return (0); 431 432 /* 433 * Some error. Self-destruct. This automagically cleans up all 434 * pending read/write and timeout event requests, making state a 435 * dangling pointer. 436 */ 437 case SSL_ERROR_SSL: 438 tls_print_errors(); 439 /* FALLTHROUGH */ 440 default: 441 tlsp_state_free(state); 442 return (-1); 443 } 444 } 445 446 /* tlsp_strategy - decide what to read or write next. */ 447 448 static void tlsp_strategy(TLSP_STATE *state) 449 { 450 TLS_SESS_STATE *tls_context = state->tls_context; 451 NBBIO *plaintext_buf; 452 int ssl_stat; 453 int ssl_read_err; 454 int ssl_write_err; 455 int handshake_err; 456 457 /* 458 * Be sure to complete the TLS handshake before enabling plain-text I/O. 459 * In case of an unrecoverable error, this automagically cleans up all 460 * pending read/write and timeout event requests. 461 */ 462 if (state->flags & TLSP_FLAG_DO_HANDSHAKE) { 463 ssl_stat = SSL_accept(tls_context->con); 464 if (ssl_stat != 1) { 465 handshake_err = SSL_get_error(tls_context->con, ssl_stat); 466 tlsp_eval_tls_error(state, handshake_err); 467 /* At this point, state could be a dangling pointer. */ 468 return; 469 } 470 if ((state->tls_context = tls_server_post_accept(tls_context)) == 0) { 471 tlsp_state_free(state); 472 return; 473 } 474 if ((state->req_flags & TLS_PROXY_FLAG_SEND_CONTEXT) != 0 475 && (attr_print(state->plaintext_stream, ATTR_FLAG_NONE, 476 ATTR_TYPE_FUNC, tls_proxy_context_print, 477 (char *) state->tls_context, ATTR_TYPE_END) != 0 478 || vstream_fflush(state->plaintext_stream) != 0)) { 479 msg_warn("cannot send TLS context: %m"); 480 tlsp_state_free(state); 481 return; 482 } 483 state->flags &= ~TLSP_FLAG_DO_HANDSHAKE; 484 } 485 486 /* 487 * Shutdown and self-destruct after NBBIO error. This automagically 488 * cleans up all pending read/write and timeout event requests. Before 489 * shutting down TLS, we stop all plain-text I/O events but keep the 490 * NBBIO error flags. 491 */ 492 plaintext_buf = state->plaintext_buf; 493 if (NBBIO_ERROR_FLAGS(plaintext_buf)) { 494 if (NBBIO_ACTIVE_FLAGS(plaintext_buf)) 495 nbbio_disable_readwrite(state->plaintext_buf); 496 ssl_stat = SSL_shutdown(tls_context->con); 497 /* XXX Wait for return value 1 if sessions are to be reused? */ 498 if (ssl_stat < 0) { 499 handshake_err = SSL_get_error(tls_context->con, ssl_stat); 500 tlsp_eval_tls_error(state, handshake_err); 501 /* At this point, state could be a dangling pointer. */ 502 return; 503 } 504 tlsp_state_free(state); 505 return; 506 } 507 508 /* 509 * Try to move data from the plaintext input buffer to the TLS engine. 510 * 511 * XXX We're supposed to repeat the exact same SSL_write() call arguments 512 * after an SSL_ERROR_WANT_READ or SSL_ERROR_WANT_WRITE result. Rumor has 513 * it that this is because each SSL_write() call reads from the buffer 514 * incrementally, and returns > 0 only after the final byte is processed. 515 * Rumor also has it that setting SSL_MODE_ENABLE_PARTIAL_WRITE and 516 * SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER voids this requirement, and that 517 * repeating the request with an increased request size is OK. 518 * Unfortunately all this is not or poorly documented, and one has to 519 * rely on statements from OpenSSL developers in public mailing archives. 520 */ 521 ssl_write_err = SSL_ERROR_NONE; 522 while (NBBIO_READ_PEND(plaintext_buf) > 0) { 523 ssl_stat = SSL_write(tls_context->con, NBBIO_READ_BUF(plaintext_buf), 524 NBBIO_READ_PEND(plaintext_buf)); 525 ssl_write_err = SSL_get_error(tls_context->con, ssl_stat); 526 if (ssl_write_err != SSL_ERROR_NONE) 527 break; 528 /* Allow the plaintext pseudothread to read more data. */ 529 NBBIO_READ_PEND(plaintext_buf) -= ssl_stat; 530 if (NBBIO_READ_PEND(plaintext_buf) > 0) 531 memmove(NBBIO_READ_BUF(plaintext_buf), 532 NBBIO_READ_BUF(plaintext_buf) + ssl_stat, 533 NBBIO_READ_PEND(plaintext_buf)); 534 } 535 536 /* 537 * Try to move data from the TLS engine to the plaintext output buffer. 538 * Note: data may arrive as a side effect of calling SSL_write(), 539 * therefore we call SSL_read() after calling SSL_write(). 540 * 541 * XXX We're supposed to repeat the exact same SSL_read() call arguments 542 * after an SSL_ERROR_WANT_READ or SSL_ERROR_WANT_WRITE result. This 543 * supposedly means that our plaintext writer must not memmove() the 544 * plaintext output buffer until after the SSL_read() call succeeds. For 545 * now I'll ignore this, because 1) SSL_read() is documented to return 546 * the bytes available, instead of returning > 0 only after the entire 547 * buffer is processed like SSL_write() does; and 2) there is no "read" 548 * equivalent of the SSL_R_BAD_WRITE_RETRY, SSL_MODE_ENABLE_PARTIAL_WRITE 549 * or SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER features. 550 */ 551 ssl_read_err = SSL_ERROR_NONE; 552 while (NBBIO_WRITE_PEND(state->plaintext_buf) < NBBIO_BUFSIZE(plaintext_buf)) { 553 ssl_stat = SSL_read(tls_context->con, 554 NBBIO_WRITE_BUF(plaintext_buf) 555 + NBBIO_WRITE_PEND(state->plaintext_buf), 556 NBBIO_BUFSIZE(plaintext_buf) 557 - NBBIO_WRITE_PEND(state->plaintext_buf)); 558 ssl_read_err = SSL_get_error(tls_context->con, ssl_stat); 559 if (ssl_read_err != SSL_ERROR_NONE) 560 break; 561 NBBIO_WRITE_PEND(plaintext_buf) += ssl_stat; 562 } 563 564 /* 565 * Try to enable/disable ciphertext read/write events. If SSL_write() was 566 * satisfied, see if SSL_read() wants to do some work. In case of an 567 * unrecoverable error, this automagically destroys the session state 568 * after cleaning up all pending read/write and timeout event requests. 569 */ 570 if (tlsp_eval_tls_error(state, ssl_write_err != SSL_ERROR_NONE ? 571 ssl_write_err : ssl_read_err) < 0) 572 return; 573 574 /* 575 * Try to enable/disable plaintext read/write events. Basically, if we 576 * have nothing to write to the postscreen(8) server, see if there is 577 * something to read. If the write buffer is empty and the read buffer is 578 * full, suspend plaintext I/O until conditions change (but keep the 579 * timer active, as a safety mechanism in case ciphertext I/O gets 580 * stuck). 581 * 582 * XXX In theory, if the client keeps writing fast enough then we would 583 * never read from postscreen(8), and cause postscreen(8) to block. In 584 * practice, postscreen(8) limits the number of client commands, and thus 585 * postscreen(8)'s output will fit in a kernel buffer. This may not be 586 * true in other scenarios where the tlsproxy(8) server could be used. 587 */ 588 if (NBBIO_WRITE_PEND(plaintext_buf) > 0) { 589 if (NBBIO_ACTIVE_FLAGS(plaintext_buf) & NBBIO_FLAG_READ) 590 nbbio_disable_readwrite(plaintext_buf); 591 if ((NBBIO_ACTIVE_FLAGS(plaintext_buf) & NBBIO_FLAG_WRITE) == 0) 592 nbbio_enable_write(plaintext_buf, state->timeout); 593 } else if (NBBIO_READ_PEND(plaintext_buf) < NBBIO_BUFSIZE(plaintext_buf)) { 594 if (NBBIO_ACTIVE_FLAGS(plaintext_buf) & NBBIO_FLAG_WRITE) 595 nbbio_disable_readwrite(plaintext_buf); 596 if ((NBBIO_ACTIVE_FLAGS(plaintext_buf) & NBBIO_FLAG_READ) == 0) 597 nbbio_enable_read(plaintext_buf, state->timeout); 598 } else { 599 if (NBBIO_ACTIVE_FLAGS(plaintext_buf)) 600 nbbio_slumber(plaintext_buf, state->timeout); 601 } 602 } 603 604 /* tlsp_plaintext_event - plaintext was read/written */ 605 606 static void tlsp_plaintext_event(int event, char *context) 607 { 608 TLSP_STATE *state = (TLSP_STATE *) context; 609 610 /* 611 * Safety alert: the plaintext pseudothreads have "slumbered" for too 612 * long (see code above). This means that the ciphertext pseudothreads 613 * are stuck. 614 */ 615 if ((NBBIO_ERROR_FLAGS(state->plaintext_buf) & NBBIO_FLAG_TIMEOUT) != 0 616 && NBBIO_ACTIVE_FLAGS(state->plaintext_buf) == 0) 617 msg_warn("deadlock on ciphertext stream for %s", state->remote_endpt); 618 619 /* 620 * This is easy, because the NBBIO layer has already done the event 621 * decoding and plaintext I/O for us. All we need to do is decide if we 622 * want to read or write more plaintext. 623 */ 624 tlsp_strategy(state); 625 } 626 627 /* tlsp_ciphertext_event - ciphertext is ready to read/write */ 628 629 static void tlsp_ciphertext_event(int event, char *context) 630 { 631 TLSP_STATE *state = (TLSP_STATE *) context; 632 633 /* 634 * Without a TLS quivalent of the NBBIO layer, we must decode the events 635 * ourselves and do the ciphertext I/O. Then, we can decide if we want to 636 * read or write more ciphertext. 637 */ 638 if (event == EVENT_READ || event == EVENT_WRITE) { 639 tlsp_strategy(state); 640 } else { 641 if (event == EVENT_TIME && state->ssl_last_err == SSL_ERROR_NONE) 642 msg_warn("deadlock on plaintext stream for %s", 643 state->remote_endpt); 644 else 645 msg_warn("ciphertext read/write %s for %s", 646 event == EVENT_TIME ? "timeout" : "error", 647 state->remote_endpt); 648 tlsp_state_free(state); 649 } 650 } 651 652 /* tlsp_start_tls - turn on TLS or force disconnect */ 653 654 static void tlsp_start_tls(TLSP_STATE *state) 655 { 656 TLS_SERVER_START_PROPS props; 657 static char *cipher_grade; 658 static VSTRING *cipher_exclusions; 659 660 /* 661 * The code in this routine is pasted literally from smtpd(8). I am not 662 * going to sanitize this because doing so surely will break things in 663 * unexpected ways. 664 */ 665 666 /* 667 * Perform the before-handshake portion of the per-session initalization. 668 * Pass a null VSTREAM to indicate that this program, will do the 669 * ciphertext I/O, not libtls. 670 * 671 * The cipher grade and exclusions don't change between sessions. Compute 672 * just once and cache. 673 */ 674 #define ADD_EXCLUDE(vstr, str) \ 675 do { \ 676 if (*(str)) \ 677 vstring_sprintf_append((vstr), "%s%s", \ 678 VSTRING_LEN(vstr) ? " " : "", (str)); \ 679 } while (0) 680 681 if (cipher_grade == 0) { 682 cipher_grade = 683 var_tlsp_enforce_tls ? var_tlsp_tls_mand_ciph : var_tlsp_tls_ciph; 684 cipher_exclusions = vstring_alloc(10); 685 ADD_EXCLUDE(cipher_exclusions, var_tlsp_tls_excl_ciph); 686 if (var_tlsp_enforce_tls) 687 ADD_EXCLUDE(cipher_exclusions, var_tlsp_tls_mand_excl); 688 if (ask_client_cert) 689 ADD_EXCLUDE(cipher_exclusions, "aNULL"); 690 } 691 state->tls_context = 692 TLS_SERVER_START(&props, 693 ctx = tlsp_server_ctx, 694 stream = (VSTREAM *) 0,/* unused */ 695 fd = state->ciphertext_fd, 696 timeout = 0, /* unused */ 697 requirecert = (var_tlsp_tls_req_ccert 698 && var_tlsp_enforce_tls), 699 serverid = state->server_id, 700 namaddr = state->remote_endpt, 701 cipher_grade = cipher_grade, 702 cipher_exclusions = STR(cipher_exclusions), 703 fpt_dgst = var_tlsp_tls_fpt_dgst); 704 705 if (state->tls_context == 0) { 706 tlsp_state_free(state); 707 return; 708 } 709 710 /* 711 * XXX Do we care about TLS session rate limits? Good postscreen(8) 712 * clients will occasionally require the tlsproxy to renew their 713 * whitelist status, but bad clients hammering the server can suck up 714 * lots of CPU cycles. Per-client concurrency limits in postscreen(8) 715 * will divert only naive security "researchers". 716 * 717 * XXX Do we care about certificate verification results? Not as long as 718 * postscreen(8) doesn't actually receive email. 719 */ 720 } 721 722 /* tlsp_get_fd_event - receive final postscreen(8) hand-off information */ 723 724 static void tlsp_get_fd_event(int event, char *context) 725 { 726 const char *myname = "tlsp_get_fd_event"; 727 TLSP_STATE *state = (TLSP_STATE *) context; 728 int plaintext_fd = vstream_fileno(state->plaintext_stream); 729 730 /* 731 * At this point we still manually manage plaintext read/write/timeout 732 * events. Disable I/O and timer events. Don't assume that the first 733 * plaintext request will be a read. 734 */ 735 event_disable_readwrite(plaintext_fd); 736 if (event != EVENT_TIME) 737 event_cancel_timer(tlsp_get_fd_event, (char *) state); 738 739 /* 740 * Initialize plaintext-related session state. Once we have this behind 741 * us, the TLSP_STATE destructor will automagically clean up requests for 742 * read/write/timeout events, which makes error recovery easier. 743 * 744 * Register the plaintext event handler for timer cleanup in the TLSP_STATE 745 * destructor. Insert the NBBIO event-driven I/O layer between the 746 * postscreen(8) server and the TLS engine. 747 */ 748 if (event != EVENT_READ 749 || (state->ciphertext_fd = LOCAL_RECV_FD(plaintext_fd)) < 0) { 750 msg_warn("%s: receive SMTP client file descriptor: %m", myname); 751 tlsp_state_free(state); 752 return; 753 } 754 non_blocking(state->ciphertext_fd, NON_BLOCKING); 755 state->ciphertext_timer = tlsp_ciphertext_event; 756 state->plaintext_buf = nbbio_create(plaintext_fd, 757 VSTREAM_BUFSIZE, "postscreen", 758 tlsp_plaintext_event, 759 (char *) state); 760 761 /* 762 * Perform the TLS layer before-handshake initialization. We perform the 763 * remainder after the TLS handshake completes. 764 */ 765 tlsp_start_tls(state); 766 767 /* 768 * Trigger the initial proxy server I/Os. 769 */ 770 tlsp_strategy(state); 771 } 772 773 /* tlsp_get_request_event - receive initial postscreen(8) hand-off info */ 774 775 static void tlsp_get_request_event(int event, char *context) 776 { 777 const char *myname = "tlsp_get_request_event"; 778 TLSP_STATE *state = (TLSP_STATE *) context; 779 VSTREAM *plaintext_stream = state->plaintext_stream; 780 int plaintext_fd = vstream_fileno(plaintext_stream); 781 static VSTRING *remote_endpt; 782 static VSTRING *server_id; 783 int req_flags; 784 int timeout; 785 int ready; 786 787 /* 788 * One-time initialization. 789 */ 790 if (remote_endpt == 0) { 791 remote_endpt = vstring_alloc(10); 792 server_id = vstring_alloc(10); 793 } 794 795 /* 796 * At this point we still manually manage plaintext read/write/timeout 797 * events. Turn off timer events. Below we disable read events on error, 798 * and redefine read events on success. 799 */ 800 if (event != EVENT_TIME) 801 event_cancel_timer(tlsp_get_request_event, (char *) state); 802 803 /* 804 * We must send some data, after receiving the request attributes and 805 * before receiving the remote file descriptor. We can't assume 806 * UNIX-domain socket semantics here. 807 */ 808 if (event != EVENT_READ 809 || attr_scan(plaintext_stream, ATTR_FLAG_STRICT, 810 ATTR_TYPE_STR, MAIL_ATTR_REMOTE_ENDPT, remote_endpt, 811 ATTR_TYPE_INT, MAIL_ATTR_FLAGS, &req_flags, 812 ATTR_TYPE_INT, MAIL_ATTR_TIMEOUT, &timeout, 813 ATTR_TYPE_STR, MAIL_ATTR_SERVER_ID, server_id, 814 ATTR_TYPE_END) != 4) { 815 msg_warn("%s: receive request attributes: %m", myname); 816 event_disable_readwrite(plaintext_fd); 817 tlsp_state_free(state); 818 return; 819 } 820 821 /* 822 * If the requested TLS engine is unavailable, hang up after making sure 823 * that the plaintext peer has received our "sorry" indication. 824 */ 825 ready = ((req_flags & TLS_PROXY_FLAG_ROLE_SERVER) != 0 826 && tlsp_server_ctx != 0); 827 if (attr_print(plaintext_stream, ATTR_FLAG_NONE, 828 ATTR_TYPE_INT, MAIL_ATTR_STATUS, ready, 829 ATTR_TYPE_END) != 0 830 || vstream_fflush(plaintext_stream) != 0 831 || ready == 0) { 832 read_wait(plaintext_fd, TLSP_INIT_TIMEOUT); /* XXX */ 833 event_disable_readwrite(plaintext_fd); 834 tlsp_state_free(state); 835 return; 836 } 837 838 /* 839 * XXX We use the same fixed timeout throughout the entire session for 840 * both plaintext and ciphertext communication. This timeout is just a 841 * safety feature; the real timeout will be enforced by our plaintext 842 * peer. 843 */ 844 else { 845 state->remote_endpt = mystrdup(STR(remote_endpt)); 846 state->server_id = mystrdup(STR(server_id)); 847 msg_info("CONNECT %s %s", 848 (req_flags & TLS_PROXY_FLAG_ROLE_SERVER) ? "from" : 849 (req_flags & TLS_PROXY_FLAG_ROLE_CLIENT) ? "to" : 850 "(bogus_direction)", state->remote_endpt); 851 state->req_flags = req_flags; 852 state->timeout = timeout + 10; /* XXX */ 853 event_enable_read(plaintext_fd, tlsp_get_fd_event, (char *) state); 854 event_request_timer(tlsp_get_fd_event, (char *) state, 855 TLSP_INIT_TIMEOUT); 856 return; 857 } 858 } 859 860 /* tlsp_service - handle new client connection */ 861 862 static void tlsp_service(VSTREAM *plaintext_stream, 863 char *service, 864 char **argv) 865 { 866 TLSP_STATE *state; 867 int plaintext_fd = vstream_fileno(plaintext_stream); 868 869 /* 870 * Sanity check. This service takes no command-line arguments. 871 */ 872 if (argv[0]) 873 msg_fatal("unexpected command-line argument: %s", argv[0]); 874 875 /* 876 * This program handles multiple connections, so it must not block. We 877 * use event-driven code for all operations that introduce latency. 878 * Except that attribute lists are sent/received synchronously, once the 879 * socket is found to be ready for transmission. 880 */ 881 non_blocking(plaintext_fd, NON_BLOCKING); 882 vstream_control(plaintext_stream, 883 VSTREAM_CTL_PATH, "plaintext", 884 VSTREAM_CTL_TIMEOUT, 5, 885 VSTREAM_CTL_END); 886 887 /* 888 * Receive postscreen's remote SMTP client address/port and socket. 889 */ 890 state = tlsp_state_create(service, plaintext_stream); 891 event_enable_read(plaintext_fd, tlsp_get_request_event, (char *) state); 892 event_request_timer(tlsp_get_request_event, (char *) state, 893 TLSP_INIT_TIMEOUT); 894 } 895 896 /* pre_jail_init - pre-jail initialization */ 897 898 static void pre_jail_init(char *unused_name, char **unused_argv) 899 { 900 TLS_SERVER_INIT_PROPS props; 901 const char *cert_file; 902 int have_server_cert; 903 int no_server_cert_ok; 904 int require_server_cert; 905 906 /* 907 * The code in this routine is pasted literally from smtpd(8). I am not 908 * going to sanitize this because doing so surely will break things in 909 * unexpected ways. 910 */ 911 if (*var_tlsp_tls_level) { 912 switch (tls_level_lookup(var_tlsp_tls_level)) { 913 default: 914 msg_fatal("Invalid TLS level \"%s\"", var_tlsp_tls_level); 915 /* NOTREACHED */ 916 break; 917 case TLS_LEV_SECURE: 918 case TLS_LEV_VERIFY: 919 case TLS_LEV_FPRINT: 920 msg_warn("%s: unsupported TLS level \"%s\", using \"encrypt\"", 921 VAR_TLSP_TLS_LEVEL, var_tlsp_tls_level); 922 /* FALLTHROUGH */ 923 case TLS_LEV_ENCRYPT: 924 var_tlsp_enforce_tls = var_tlsp_use_tls = 1; 925 break; 926 case TLS_LEV_MAY: 927 var_tlsp_enforce_tls = 0; 928 var_tlsp_use_tls = 1; 929 break; 930 case TLS_LEV_NONE: 931 var_tlsp_enforce_tls = var_tlsp_use_tls = 0; 932 break; 933 } 934 } 935 var_tlsp_use_tls = var_tlsp_use_tls || var_tlsp_enforce_tls; 936 if (!var_tlsp_use_tls) { 937 msg_warn("TLS service is requested, but disabled with %s or %s", 938 VAR_TLSP_TLS_LEVEL, VAR_TLSP_USE_TLS); 939 return; 940 } 941 942 /* 943 * Load TLS keys before dropping privileges. 944 * 945 * Can't use anonymous ciphers if we want client certificates. Must use 946 * anonymous ciphers if we have no certificates. 947 */ 948 ask_client_cert = require_server_cert = 949 (var_tlsp_tls_ask_ccert 950 || (var_tlsp_enforce_tls && var_tlsp_tls_req_ccert)); 951 if (strcasecmp(var_tlsp_tls_cert_file, "none") == 0) { 952 no_server_cert_ok = 1; 953 cert_file = ""; 954 } else { 955 no_server_cert_ok = 0; 956 cert_file = var_tlsp_tls_cert_file; 957 } 958 have_server_cert = 959 (*cert_file || *var_tlsp_tls_dcert_file || *var_tlsp_tls_eccert_file); 960 961 /* Some TLS configuration errors are not show stoppers. */ 962 if (!have_server_cert && require_server_cert) 963 msg_warn("Need a server cert to request client certs"); 964 if (!var_tlsp_enforce_tls && var_tlsp_tls_req_ccert) 965 msg_warn("Can't require client certs unless TLS is required"); 966 /* After a show-stopper error, log a warning. */ 967 if (have_server_cert || (no_server_cert_ok && !require_server_cert)) 968 969 /* 970 * Large parameter lists are error-prone, so we emulate a language 971 * feature that C does not have natively: named parameter lists. 972 */ 973 tlsp_server_ctx = 974 TLS_SERVER_INIT(&props, 975 log_param = VAR_TLSP_TLS_LOGLEVEL, 976 log_level = var_tlsp_tls_loglevel, 977 verifydepth = var_tlsp_tls_ccert_vd, 978 cache_type = TLS_MGR_SCACHE_SMTPD, 979 scache_timeout = var_tlsp_tls_scache_timeout, 980 set_sessid = var_tlsp_tls_set_sessid, 981 cert_file = cert_file, 982 key_file = var_tlsp_tls_key_file, 983 dcert_file = var_tlsp_tls_dcert_file, 984 dkey_file = var_tlsp_tls_dkey_file, 985 eccert_file = var_tlsp_tls_eccert_file, 986 eckey_file = var_tlsp_tls_eckey_file, 987 CAfile = var_tlsp_tls_CAfile, 988 CApath = var_tlsp_tls_CApath, 989 dh1024_param_file 990 = var_tlsp_tls_dh1024_param_file, 991 dh512_param_file 992 = var_tlsp_tls_dh512_param_file, 993 eecdh_grade = var_tlsp_tls_eecdh, 994 protocols = var_tlsp_enforce_tls ? 995 var_tlsp_tls_mand_proto : 996 var_tlsp_tls_proto, 997 ask_ccert = ask_client_cert, 998 fpt_dgst = var_tlsp_tls_fpt_dgst); 999 else 1000 msg_warn("No server certs available. TLS can't be enabled"); 1001 1002 /* 1003 * To maintain sanity, allow partial SSL_write() operations, and allow 1004 * SSL_write() buffer pointers to change after a WANT_READ or WANT_WRITE 1005 * result. This is based on OpenSSL developers talking on a mailing list, 1006 * but is not supported by documentation. If this code stops working then 1007 * no-one can be held responsible. 1008 */ 1009 if (tlsp_server_ctx) 1010 SSL_CTX_set_mode(tlsp_server_ctx->ssl_ctx, 1011 SSL_MODE_ENABLE_PARTIAL_WRITE 1012 | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER); 1013 } 1014 1015 /* post_jail_init - post-jail initialization */ 1016 1017 static void post_jail_init(char *unused_name, char **unused_argv) 1018 { 1019 /* void */ ; 1020 } 1021 1022 MAIL_VERSION_STAMP_DECLARE; 1023 1024 /* main - the main program */ 1025 1026 int main(int argc, char **argv) 1027 { 1028 static const CONFIG_INT_TABLE int_table[] = { 1029 VAR_SMTPD_TLS_CCERT_VD, DEF_SMTPD_TLS_CCERT_VD, &var_smtpd_tls_ccert_vd, 0, 0, 1030 0, 1031 }; 1032 static const CONFIG_NINT_TABLE nint_table[] = { 1033 VAR_TLSP_TLS_CCERT_VD, DEF_TLSP_TLS_CCERT_VD, &var_tlsp_tls_ccert_vd, 0, 0, 1034 0, 1035 }; 1036 static const CONFIG_TIME_TABLE time_table[] = { 1037 VAR_SMTPD_TLS_SCACHTIME, DEF_SMTPD_TLS_SCACHTIME, &var_smtpd_tls_scache_timeout, 0, 0, 1038 VAR_TLSP_WATCHDOG, DEF_TLSP_WATCHDOG, &var_tlsp_watchdog, 10, 0, 1039 VAR_TLSP_TLS_SCACHTIME, DEF_TLSP_TLS_SCACHTIME, &var_tlsp_tls_scache_timeout, 0, 0, 1040 0, 1041 }; 1042 static const CONFIG_BOOL_TABLE bool_table[] = { 1043 VAR_SMTPD_USE_TLS, DEF_SMTPD_USE_TLS, &var_smtpd_use_tls, 1044 VAR_SMTPD_ENFORCE_TLS, DEF_SMTPD_ENFORCE_TLS, &var_smtpd_enforce_tls, 1045 VAR_SMTPD_TLS_ACERT, DEF_SMTPD_TLS_ACERT, &var_smtpd_tls_ask_ccert, 1046 VAR_SMTPD_TLS_RCERT, DEF_SMTPD_TLS_RCERT, &var_smtpd_tls_req_ccert, 1047 VAR_SMTPD_TLS_SET_SESSID, DEF_SMTPD_TLS_SET_SESSID, &var_smtpd_tls_set_sessid, 1048 0, 1049 }; 1050 static const CONFIG_NBOOL_TABLE nbool_table[] = { 1051 VAR_TLSP_USE_TLS, DEF_TLSP_USE_TLS, &var_tlsp_use_tls, 1052 VAR_TLSP_ENFORCE_TLS, DEF_TLSP_ENFORCE_TLS, &var_tlsp_enforce_tls, 1053 VAR_TLSP_TLS_ACERT, DEF_TLSP_TLS_ACERT, &var_tlsp_tls_ask_ccert, 1054 VAR_TLSP_TLS_RCERT, DEF_TLSP_TLS_RCERT, &var_tlsp_tls_req_ccert, 1055 VAR_TLSP_TLS_SET_SESSID, DEF_TLSP_TLS_SET_SESSID, &var_tlsp_tls_set_sessid, 1056 0, 1057 }; 1058 static const CONFIG_STR_TABLE str_table[] = { 1059 VAR_SMTPD_TLS_CERT_FILE, DEF_SMTPD_TLS_CERT_FILE, &var_smtpd_tls_cert_file, 0, 0, 1060 VAR_SMTPD_TLS_KEY_FILE, DEF_SMTPD_TLS_KEY_FILE, &var_smtpd_tls_key_file, 0, 0, 1061 VAR_SMTPD_TLS_DCERT_FILE, DEF_SMTPD_TLS_DCERT_FILE, &var_smtpd_tls_dcert_file, 0, 0, 1062 VAR_SMTPD_TLS_DKEY_FILE, DEF_SMTPD_TLS_DKEY_FILE, &var_smtpd_tls_dkey_file, 0, 0, 1063 VAR_SMTPD_TLS_ECCERT_FILE, DEF_SMTPD_TLS_ECCERT_FILE, &var_smtpd_tls_eccert_file, 0, 0, 1064 VAR_SMTPD_TLS_ECKEY_FILE, DEF_SMTPD_TLS_ECKEY_FILE, &var_smtpd_tls_eckey_file, 0, 0, 1065 VAR_SMTPD_TLS_CA_FILE, DEF_SMTPD_TLS_CA_FILE, &var_smtpd_tls_CAfile, 0, 0, 1066 VAR_SMTPD_TLS_CA_PATH, DEF_SMTPD_TLS_CA_PATH, &var_smtpd_tls_CApath, 0, 0, 1067 VAR_SMTPD_TLS_CIPH, DEF_SMTPD_TLS_CIPH, &var_smtpd_tls_ciph, 1, 0, 1068 VAR_SMTPD_TLS_MAND_CIPH, DEF_SMTPD_TLS_MAND_CIPH, &var_smtpd_tls_mand_ciph, 1, 0, 1069 VAR_SMTPD_TLS_EXCL_CIPH, DEF_SMTPD_TLS_EXCL_CIPH, &var_smtpd_tls_excl_ciph, 0, 0, 1070 VAR_SMTPD_TLS_MAND_EXCL, DEF_SMTPD_TLS_MAND_EXCL, &var_smtpd_tls_mand_excl, 0, 0, 1071 VAR_SMTPD_TLS_PROTO, DEF_SMTPD_TLS_PROTO, &var_smtpd_tls_proto, 0, 0, 1072 VAR_SMTPD_TLS_MAND_PROTO, DEF_SMTPD_TLS_MAND_PROTO, &var_smtpd_tls_mand_proto, 0, 0, 1073 VAR_SMTPD_TLS_512_FILE, DEF_SMTPD_TLS_512_FILE, &var_smtpd_tls_dh512_param_file, 0, 0, 1074 VAR_SMTPD_TLS_1024_FILE, DEF_SMTPD_TLS_1024_FILE, &var_smtpd_tls_dh1024_param_file, 0, 0, 1075 VAR_SMTPD_TLS_EECDH, DEF_SMTPD_TLS_EECDH, &var_smtpd_tls_eecdh, 1, 0, 1076 VAR_SMTPD_TLS_FPT_DGST, DEF_SMTPD_TLS_FPT_DGST, &var_smtpd_tls_fpt_dgst, 1, 0, 1077 VAR_SMTPD_TLS_LOGLEVEL, DEF_SMTPD_TLS_LOGLEVEL, &var_smtpd_tls_loglevel, 0, 0, 1078 VAR_SMTPD_TLS_LEVEL, DEF_SMTPD_TLS_LEVEL, &var_smtpd_tls_level, 0, 0, 1079 VAR_TLSP_TLS_CERT_FILE, DEF_TLSP_TLS_CERT_FILE, &var_tlsp_tls_cert_file, 0, 0, 1080 VAR_TLSP_TLS_KEY_FILE, DEF_TLSP_TLS_KEY_FILE, &var_tlsp_tls_key_file, 0, 0, 1081 VAR_TLSP_TLS_DCERT_FILE, DEF_TLSP_TLS_DCERT_FILE, &var_tlsp_tls_dcert_file, 0, 0, 1082 VAR_TLSP_TLS_DKEY_FILE, DEF_TLSP_TLS_DKEY_FILE, &var_tlsp_tls_dkey_file, 0, 0, 1083 VAR_TLSP_TLS_ECCERT_FILE, DEF_TLSP_TLS_ECCERT_FILE, &var_tlsp_tls_eccert_file, 0, 0, 1084 VAR_TLSP_TLS_ECKEY_FILE, DEF_TLSP_TLS_ECKEY_FILE, &var_tlsp_tls_eckey_file, 0, 0, 1085 VAR_TLSP_TLS_CA_FILE, DEF_TLSP_TLS_CA_FILE, &var_tlsp_tls_CAfile, 0, 0, 1086 VAR_TLSP_TLS_CA_PATH, DEF_TLSP_TLS_CA_PATH, &var_tlsp_tls_CApath, 0, 0, 1087 VAR_TLSP_TLS_CIPH, DEF_TLSP_TLS_CIPH, &var_tlsp_tls_ciph, 1, 0, 1088 VAR_TLSP_TLS_MAND_CIPH, DEF_TLSP_TLS_MAND_CIPH, &var_tlsp_tls_mand_ciph, 1, 0, 1089 VAR_TLSP_TLS_EXCL_CIPH, DEF_TLSP_TLS_EXCL_CIPH, &var_tlsp_tls_excl_ciph, 0, 0, 1090 VAR_TLSP_TLS_MAND_EXCL, DEF_TLSP_TLS_MAND_EXCL, &var_tlsp_tls_mand_excl, 0, 0, 1091 VAR_TLSP_TLS_PROTO, DEF_TLSP_TLS_PROTO, &var_tlsp_tls_proto, 0, 0, 1092 VAR_TLSP_TLS_MAND_PROTO, DEF_TLSP_TLS_MAND_PROTO, &var_tlsp_tls_mand_proto, 0, 0, 1093 VAR_TLSP_TLS_512_FILE, DEF_TLSP_TLS_512_FILE, &var_tlsp_tls_dh512_param_file, 0, 0, 1094 VAR_TLSP_TLS_1024_FILE, DEF_TLSP_TLS_1024_FILE, &var_tlsp_tls_dh1024_param_file, 0, 0, 1095 VAR_TLSP_TLS_EECDH, DEF_TLSP_TLS_EECDH, &var_tlsp_tls_eecdh, 1, 0, 1096 VAR_TLSP_TLS_FPT_DGST, DEF_TLSP_TLS_FPT_DGST, &var_tlsp_tls_fpt_dgst, 1, 0, 1097 VAR_TLSP_TLS_LOGLEVEL, DEF_TLSP_TLS_LOGLEVEL, &var_tlsp_tls_loglevel, 0, 0, 1098 VAR_TLSP_TLS_LEVEL, DEF_TLSP_TLS_LEVEL, &var_tlsp_tls_level, 0, 0, 1099 0, 1100 }; 1101 1102 /* 1103 * Fingerprint executables and core dumps. 1104 */ 1105 MAIL_VERSION_STAMP_ALLOCATE; 1106 1107 /* 1108 * Pass control to the single-threaded service skeleton. 1109 */ 1110 event_server_main(argc, argv, tlsp_service, 1111 MAIL_SERVER_INT_TABLE, int_table, 1112 MAIL_SERVER_NINT_TABLE, nint_table, 1113 MAIL_SERVER_STR_TABLE, str_table, 1114 MAIL_SERVER_BOOL_TABLE, bool_table, 1115 MAIL_SERVER_NBOOL_TABLE, nbool_table, 1116 MAIL_SERVER_TIME_TABLE, time_table, 1117 MAIL_SERVER_PRE_INIT, pre_jail_init, 1118 MAIL_SERVER_POST_INIT, post_jail_init, 1119 MAIL_SERVER_SLOW_EXIT, tlsp_drain, 1120 MAIL_SERVER_WATCHDOG, &var_tlsp_watchdog, 1121 0); 1122 } 1123 1124 #else 1125 1126 /* tlsp_service - respond to external trigger(s), non-TLS version */ 1127 1128 static void tlsp_service(VSTREAM *stream, char *unused_service, 1129 char **unused_argv) 1130 { 1131 msg_info("TLS support is not compiled in -- exiting"); 1132 event_server_disconnect(stream); 1133 } 1134 1135 /* main - the main program */ 1136 1137 int main(int argc, char **argv) 1138 { 1139 1140 /* 1141 * We can't simply use msg_fatal() here, because the logging hasn't been 1142 * initialized. The text would disappear because stderr is redirected to 1143 * /dev/null. 1144 * 1145 * We invoke event_server_main() to complete program initialization 1146 * (including logging) and then invoke the tlsp_service() routine to log 1147 * the message that says why this program will not run. 1148 */ 1149 event_server_main(argc, argv, tlsp_service, 1150 0); 1151 } 1152 1153 #endif 1154