1 /* $NetBSD: proxymap.c,v 1.1.1.3 2013/01/02 18:59:06 tron Exp $ */ 2 3 /*++ 4 /* NAME 5 /* proxymap 8 6 /* SUMMARY 7 /* Postfix lookup table proxy server 8 /* SYNOPSIS 9 /* \fBproxymap\fR [generic Postfix daemon options] 10 /* DESCRIPTION 11 /* The \fBproxymap\fR(8) server provides read-only or read-write 12 /* table lookup service to Postfix processes. These services are 13 /* implemented with distinct service names: \fBproxymap\fR and 14 /* \fBproxywrite\fR, respectively. The purpose of these services is: 15 /* .IP \(bu 16 /* To overcome chroot restrictions. For example, a chrooted SMTP 17 /* server needs access to the system passwd file in order to 18 /* reject mail for non-existent local addresses, but it is not 19 /* practical to maintain a copy of the passwd file in the chroot 20 /* jail. The solution: 21 /* .sp 22 /* .nf 23 /* local_recipient_maps = 24 /* proxy:unix:passwd.byname $alias_maps 25 /* .fi 26 /* .IP \(bu 27 /* To consolidate the number of open lookup tables by sharing 28 /* one open table among multiple processes. For example, making 29 /* mysql connections from every Postfix daemon process results 30 /* in "too many connections" errors. The solution: 31 /* .sp 32 /* .nf 33 /* virtual_alias_maps = 34 /* proxy:mysql:/etc/postfix/virtual_alias.cf 35 /* .fi 36 /* .sp 37 /* The total number of connections is limited by the number of 38 /* proxymap server processes. 39 /* .IP \(bu 40 /* To provide single-updater functionality for lookup tables 41 /* that do not reliably support multiple writers (i.e. all 42 /* file-based tables). 43 /* .PP 44 /* The \fBproxymap\fR(8) server implements the following requests: 45 /* .IP "\fBopen\fR \fImaptype:mapname flags\fR" 46 /* Open the table with type \fImaptype\fR and name \fImapname\fR, 47 /* as controlled by \fIflags\fR. The reply includes the \fImaptype\fR 48 /* dependent flags (to distinguish a fixed string table from a regular 49 /* expression table). 50 /* .IP "\fBlookup\fR \fImaptype:mapname flags key\fR" 51 /* Look up the data stored under the requested key. 52 /* The reply is the request completion status code and 53 /* the lookup result value. 54 /* The \fImaptype:mapname\fR and \fIflags\fR are the same 55 /* as with the \fBopen\fR request. 56 /* .IP "\fBupdate\fR \fImaptype:mapname flags key value\fR" 57 /* Update the data stored under the requested key. 58 /* The reply is the request completion status code. 59 /* The \fImaptype:mapname\fR and \fIflags\fR are the same 60 /* as with the \fBopen\fR request. 61 /* .sp 62 /* To implement single-updater maps, specify a process limit 63 /* of 1 in the master.cf file entry for the \fBproxywrite\fR 64 /* service. 65 /* .sp 66 /* This request is supported in Postfix 2.5 and later. 67 /* .IP "\fBdelete\fR \fImaptype:mapname flags key\fR" 68 /* Delete the data stored under the requested key. 69 /* The reply is the request completion status code. 70 /* The \fImaptype:mapname\fR and \fIflags\fR are the same 71 /* as with the \fBopen\fR request. 72 /* .sp 73 /* This request is supported in Postfix 2.5 and later. 74 /* .IP "\fBsequence\fR \fImaptype:mapname flags function\fR" 75 /* Iterate over the specified database. The \fIfunction\fR 76 /* is one of DICT_SEQ_FUN_FIRST or DICT_SEQ_FUN_NEXT. 77 /* The reply is the request completion status code and 78 /* a lookup key and result value, if found. 79 /* .sp 80 /* This request is supported in Postfix 2.9 and later. 81 /* .PP 82 /* The request completion status is one of OK, RETRY, NOKEY 83 /* (lookup failed because the key was not found), BAD (malformed 84 /* request) or DENY (the table is not approved for proxy read 85 /* or update access). 86 /* 87 /* There is no \fBclose\fR command, nor are tables implicitly closed 88 /* when a client disconnects. The purpose is to share tables among 89 /* multiple client processes. 90 /* SERVER PROCESS MANAGEMENT 91 /* .ad 92 /* .fi 93 /* \fBproxymap\fR(8) servers run under control by the Postfix 94 /* \fBmaster\fR(8) 95 /* server. Each server can handle multiple simultaneous connections. 96 /* When all servers are busy while a client connects, the \fBmaster\fR(8) 97 /* creates a new \fBproxymap\fR(8) server process, provided that the 98 /* process limit is not exceeded. 99 /* Each server terminates after serving at least \fB$max_use\fR clients 100 /* or after \fB$max_idle\fR seconds of idle time. 101 /* SECURITY 102 /* .ad 103 /* .fi 104 /* The \fBproxymap\fR(8) server opens only tables that are 105 /* approved via the \fBproxy_read_maps\fR or \fBproxy_write_maps\fR 106 /* configuration parameters, does not talk to 107 /* users, and can run at fixed low privilege, chrooted or not. 108 /* However, running the proxymap server chrooted severely limits 109 /* usability, because it can open only chrooted tables. 110 /* 111 /* The \fBproxymap\fR(8) server is not a trusted daemon process, and must 112 /* not be used to look up sensitive information such as user or 113 /* group IDs, mailbox file/directory names or external commands. 114 /* 115 /* In Postfix version 2.2 and later, the proxymap client recognizes 116 /* requests to access a table for security-sensitive purposes, 117 /* and opens the table directly. This allows the same main.cf 118 /* setting to be used by sensitive and non-sensitive processes. 119 /* 120 /* Postfix-writable data files should be stored under a dedicated 121 /* directory that is writable only by the Postfix mail system, 122 /* such as the Postfix-owned \fBdata_directory\fR. 123 /* 124 /* In particular, Postfix-writable files should never exist 125 /* in root-owned directories. That would open up a particular 126 /* type of security hole where ownership of a file or directory 127 /* does not match the provider of its content. 128 /* DIAGNOSTICS 129 /* Problems and transactions are logged to \fBsyslogd\fR(8). 130 /* BUGS 131 /* The \fBproxymap\fR(8) server provides service to multiple clients, 132 /* and must therefore not be used for tables that have high-latency 133 /* lookups. 134 /* 135 /* The \fBproxymap\fR(8) read-write service does not explicitly 136 /* close lookup tables (even if it did, this could not be relied on, 137 /* because the process may be terminated between table updates). 138 /* The read-write service should therefore not be used with tables that 139 /* leave persistent storage in an inconsistent state between 140 /* updates (for example, CDB). Tables that support "sync on 141 /* update" should be safe (for example, Berkeley DB) as should 142 /* tables that are implemented by a real DBMS. 143 /* CONFIGURATION PARAMETERS 144 /* .ad 145 /* .fi 146 /* On busy mail systems a long time may pass before 147 /* \fBproxymap\fR(8) relevant 148 /* changes to \fBmain.cf\fR are picked up. Use the command 149 /* "\fBpostfix reload\fR" to speed up a change. 150 /* 151 /* The text below provides only a parameter summary. See 152 /* \fBpostconf\fR(5) for more details including examples. 153 /* .IP "\fBconfig_directory (see 'postconf -d' output)\fR" 154 /* The default location of the Postfix main.cf and master.cf 155 /* configuration files. 156 /* .IP "\fBdata_directory (see 'postconf -d' output)\fR" 157 /* The directory with Postfix-writable data files (for example: 158 /* caches, pseudo-random numbers). 159 /* .IP "\fBdaemon_timeout (18000s)\fR" 160 /* How much time a Postfix daemon process may take to handle a 161 /* request before it is terminated by a built-in watchdog timer. 162 /* .IP "\fBipc_timeout (3600s)\fR" 163 /* The time limit for sending or receiving information over an internal 164 /* communication channel. 165 /* .IP "\fBmax_idle (100s)\fR" 166 /* The maximum amount of time that an idle Postfix daemon process waits 167 /* for an incoming connection before terminating voluntarily. 168 /* .IP "\fBmax_use (100)\fR" 169 /* The maximal number of incoming connections that a Postfix daemon 170 /* process will service before terminating voluntarily. 171 /* .IP "\fBprocess_id (read-only)\fR" 172 /* The process ID of a Postfix command or daemon process. 173 /* .IP "\fBprocess_name (read-only)\fR" 174 /* The process name of a Postfix command or daemon process. 175 /* .IP "\fBproxy_read_maps (see 'postconf -d' output)\fR" 176 /* The lookup tables that the \fBproxymap\fR(8) server is allowed to 177 /* access for the read-only service. 178 /* .PP 179 /* Available in Postfix 2.5 and later: 180 /* .IP "\fBdata_directory (see 'postconf -d' output)\fR" 181 /* The directory with Postfix-writable data files (for example: 182 /* caches, pseudo-random numbers). 183 /* .IP "\fBproxy_write_maps (see 'postconf -d' output)\fR" 184 /* The lookup tables that the \fBproxymap\fR(8) server is allowed to 185 /* access for the read-write service. 186 /* SEE ALSO 187 /* postconf(5), configuration parameters 188 /* master(5), generic daemon options 189 /* README FILES 190 /* .ad 191 /* .fi 192 /* Use "\fBpostconf readme_directory\fR" or 193 /* "\fBpostconf html_directory\fR" to locate this information. 194 /* .na 195 /* .nf 196 /* DATABASE_README, Postfix lookup table overview 197 /* LICENSE 198 /* .ad 199 /* .fi 200 /* The Secure Mailer license must be distributed with this software. 201 /* HISTORY 202 /* .ad 203 /* .fi 204 /* The proxymap service was introduced with Postfix 2.0. 205 /* AUTHOR(S) 206 /* Wietse Venema 207 /* IBM T.J. Watson Research 208 /* P.O. Box 704 209 /* Yorktown Heights, NY 10598, USA 210 /*--*/ 211 212 /* System library. */ 213 214 #include <sys_defs.h> 215 #include <string.h> 216 #include <stdlib.h> 217 #include <unistd.h> 218 219 /* Utility library. */ 220 221 #include <msg.h> 222 #include <mymalloc.h> 223 #include <vstring.h> 224 #include <htable.h> 225 #include <stringops.h> 226 #include <dict.h> 227 228 /* Global library. */ 229 230 #include <mail_conf.h> 231 #include <mail_params.h> 232 #include <mail_version.h> 233 #include <mail_proto.h> 234 #include <dict_proxy.h> 235 236 /* Server skeleton. */ 237 238 #include <mail_server.h> 239 240 /* Application-specific. */ 241 242 /* 243 * XXX All but the last are needed here so that $name expansion dependencies 244 * aren't too broken. The fix is to gather all parameter default settings in 245 * one place. 246 */ 247 char *var_alias_maps; 248 char *var_local_rcpt_maps; 249 char *var_virt_alias_maps; 250 char *var_virt_alias_doms; 251 char *var_virt_mailbox_maps; 252 char *var_virt_mailbox_doms; 253 char *var_relay_rcpt_maps; 254 char *var_relay_domains; 255 char *var_canonical_maps; 256 char *var_send_canon_maps; 257 char *var_rcpt_canon_maps; 258 char *var_relocated_maps; 259 char *var_transport_maps; 260 char *var_verify_map; 261 char *var_psc_cache_map; 262 char *var_proxy_read_maps; 263 char *var_proxy_write_maps; 264 265 /* 266 * The pre-approved, pre-parsed list of maps. 267 */ 268 static HTABLE *proxy_auth_maps; 269 270 /* 271 * Shared and static to reduce memory allocation overhead. 272 */ 273 static VSTRING *request; 274 static VSTRING *request_map; 275 static VSTRING *request_key; 276 static VSTRING *request_value; 277 static VSTRING *map_type_name_flags; 278 279 /* 280 * Are we a proxy writer or not? 281 */ 282 static int proxy_writer; 283 284 /* 285 * Silly little macros. 286 */ 287 #define STR(x) vstring_str(x) 288 #define VSTREQ(x,y) (strcmp(STR(x),y) == 0) 289 290 /* proxy_map_find - look up or open table */ 291 292 static DICT *proxy_map_find(const char *map_type_name, int request_flags, 293 int *statp) 294 { 295 DICT *dict; 296 297 #define PROXY_COLON DICT_TYPE_PROXY ":" 298 #define PROXY_COLON_LEN (sizeof(PROXY_COLON) - 1) 299 #define READ_OPEN_FLAGS O_RDONLY 300 #define WRITE_OPEN_FLAGS (O_RDWR | O_CREAT) 301 302 /* 303 * Canonicalize the map name. If the map is not on the approved list, 304 * deny the request. 305 */ 306 #define PROXY_MAP_FIND_ERROR_RETURN(x) { *statp = (x); return (0); } 307 308 while (strncmp(map_type_name, PROXY_COLON, PROXY_COLON_LEN) == 0) 309 map_type_name += PROXY_COLON_LEN; 310 if (strchr(map_type_name, ':') == 0) 311 PROXY_MAP_FIND_ERROR_RETURN(PROXY_STAT_BAD); 312 if (htable_locate(proxy_auth_maps, map_type_name) == 0) { 313 msg_warn("request for unapproved table: \"%s\"", map_type_name); 314 msg_warn("to approve this table for %s access, list %s:%s in %s:%s", 315 proxy_writer == 0 ? "read-only" : "read-write", 316 DICT_TYPE_PROXY, map_type_name, MAIN_CONF_FILE, 317 proxy_writer == 0 ? VAR_PROXY_READ_MAPS : 318 VAR_PROXY_WRITE_MAPS); 319 PROXY_MAP_FIND_ERROR_RETURN(PROXY_STAT_DENY); 320 } 321 322 /* 323 * Open one instance of a map for each combination of name+flags. 324 * 325 * Assume that a map instance can be shared among clients with different 326 * paranoia flag settings and with different map lookup flag settings. 327 * 328 * XXX The open() flags are passed implicitly, via the selection of the 329 * service name. For a more sophisticated interface, appropriate subsets 330 * of open() flags should be received directly from the client. 331 */ 332 vstring_sprintf(map_type_name_flags, "%s:%s", map_type_name, 333 dict_flags_str(request_flags & DICT_FLAG_INST_MASK)); 334 if (msg_verbose) 335 msg_info("proxy_map_find: %s", STR(map_type_name_flags)); 336 if ((dict = dict_handle(STR(map_type_name_flags))) == 0) { 337 dict = dict_open(map_type_name, proxy_writer ? 338 WRITE_OPEN_FLAGS : READ_OPEN_FLAGS, 339 request_flags); 340 if (dict == 0) 341 msg_panic("proxy_map_find: dict_open null result"); 342 dict_register(STR(map_type_name_flags), dict); 343 } 344 dict->error = 0; 345 return (dict); 346 } 347 348 /* proxymap_sequence_service - remote sequence service */ 349 350 static void proxymap_sequence_service(VSTREAM *client_stream) 351 { 352 int request_flags; 353 DICT *dict; 354 int request_func; 355 const char *reply_key; 356 const char *reply_value; 357 int dict_status; 358 int reply_status; 359 360 /* 361 * Process the request. 362 */ 363 if (attr_scan(client_stream, ATTR_FLAG_STRICT, 364 ATTR_TYPE_STR, MAIL_ATTR_TABLE, request_map, 365 ATTR_TYPE_INT, MAIL_ATTR_FLAGS, &request_flags, 366 ATTR_TYPE_INT, MAIL_ATTR_FUNC, &request_func, 367 ATTR_TYPE_END) != 3 368 || (request_func != DICT_SEQ_FUN_FIRST 369 && request_func != DICT_SEQ_FUN_NEXT)) { 370 reply_status = PROXY_STAT_BAD; 371 reply_key = reply_value = ""; 372 } else if ((dict = proxy_map_find(STR(request_map), request_flags, 373 &reply_status)) == 0) { 374 reply_key = reply_value = ""; 375 } else { 376 dict->flags = ((dict->flags & ~DICT_FLAG_RQST_MASK) 377 | (request_flags & DICT_FLAG_RQST_MASK)); 378 dict_status = dict_seq(dict, request_func, &reply_key, &reply_value); 379 if (dict_status == 0) { 380 reply_status = PROXY_STAT_OK; 381 } else if (dict->error == 0) { 382 reply_status = PROXY_STAT_NOKEY; 383 reply_key = reply_value = ""; 384 } else { 385 reply_status = PROXY_STAT_RETRY; 386 reply_key = reply_value = ""; 387 } 388 } 389 390 /* 391 * Respond to the client. 392 */ 393 attr_print(client_stream, ATTR_FLAG_NONE, 394 ATTR_TYPE_INT, MAIL_ATTR_STATUS, reply_status, 395 ATTR_TYPE_STR, MAIL_ATTR_KEY, reply_key, 396 ATTR_TYPE_STR, MAIL_ATTR_VALUE, reply_value, 397 ATTR_TYPE_END); 398 } 399 400 /* proxymap_lookup_service - remote lookup service */ 401 402 static void proxymap_lookup_service(VSTREAM *client_stream) 403 { 404 int request_flags; 405 DICT *dict; 406 const char *reply_value; 407 int reply_status; 408 409 /* 410 * Process the request. 411 */ 412 if (attr_scan(client_stream, ATTR_FLAG_STRICT, 413 ATTR_TYPE_STR, MAIL_ATTR_TABLE, request_map, 414 ATTR_TYPE_INT, MAIL_ATTR_FLAGS, &request_flags, 415 ATTR_TYPE_STR, MAIL_ATTR_KEY, request_key, 416 ATTR_TYPE_END) != 3) { 417 reply_status = PROXY_STAT_BAD; 418 reply_value = ""; 419 } else if ((dict = proxy_map_find(STR(request_map), request_flags, 420 &reply_status)) == 0) { 421 reply_value = ""; 422 } else if (dict->flags = ((dict->flags & ~DICT_FLAG_RQST_MASK) 423 | (request_flags & DICT_FLAG_RQST_MASK)), 424 (reply_value = dict_get(dict, STR(request_key))) != 0) { 425 reply_status = PROXY_STAT_OK; 426 } else if (dict->error == 0) { 427 reply_status = PROXY_STAT_NOKEY; 428 reply_value = ""; 429 } else { 430 reply_status = PROXY_STAT_RETRY; 431 reply_value = ""; 432 } 433 434 /* 435 * Respond to the client. 436 */ 437 attr_print(client_stream, ATTR_FLAG_NONE, 438 ATTR_TYPE_INT, MAIL_ATTR_STATUS, reply_status, 439 ATTR_TYPE_STR, MAIL_ATTR_VALUE, reply_value, 440 ATTR_TYPE_END); 441 } 442 443 /* proxymap_update_service - remote update service */ 444 445 static void proxymap_update_service(VSTREAM *client_stream) 446 { 447 int request_flags; 448 DICT *dict; 449 int dict_status; 450 int reply_status; 451 452 /* 453 * Process the request. 454 * 455 * XXX We don't close maps, so we must turn on synchronous update to ensure 456 * that the on-disk data is in a consistent state between updates. 457 * 458 * XXX We ignore duplicates, because the proxymap server would abort 459 * otherwise. 460 */ 461 if (attr_scan(client_stream, ATTR_FLAG_STRICT, 462 ATTR_TYPE_STR, MAIL_ATTR_TABLE, request_map, 463 ATTR_TYPE_INT, MAIL_ATTR_FLAGS, &request_flags, 464 ATTR_TYPE_STR, MAIL_ATTR_KEY, request_key, 465 ATTR_TYPE_STR, MAIL_ATTR_VALUE, request_value, 466 ATTR_TYPE_END) != 4) { 467 reply_status = PROXY_STAT_BAD; 468 } else if (proxy_writer == 0) { 469 msg_warn("refusing %s update request on non-%s service", 470 STR(request_map), MAIL_SERVICE_PROXYWRITE); 471 reply_status = PROXY_STAT_DENY; 472 } else if ((dict = proxy_map_find(STR(request_map), request_flags, 473 &reply_status)) == 0) { 474 /* void */ ; 475 } else { 476 dict->flags = ((dict->flags & ~DICT_FLAG_RQST_MASK) 477 | (request_flags & DICT_FLAG_RQST_MASK) 478 | DICT_FLAG_SYNC_UPDATE | DICT_FLAG_DUP_REPLACE); 479 dict_status = dict_put(dict, STR(request_key), STR(request_value)); 480 if (dict_status == 0) { 481 reply_status = PROXY_STAT_OK; 482 } else if (dict->error == 0) { 483 reply_status = PROXY_STAT_NOKEY; 484 } else { 485 reply_status = PROXY_STAT_RETRY; 486 } 487 } 488 489 /* 490 * Respond to the client. 491 */ 492 attr_print(client_stream, ATTR_FLAG_NONE, 493 ATTR_TYPE_INT, MAIL_ATTR_STATUS, reply_status, 494 ATTR_TYPE_END); 495 } 496 497 /* proxymap_delete_service - remote delete service */ 498 499 static void proxymap_delete_service(VSTREAM *client_stream) 500 { 501 int request_flags; 502 DICT *dict; 503 int dict_status; 504 int reply_status; 505 506 /* 507 * Process the request. 508 * 509 * XXX We don't close maps, so we must turn on synchronous update to ensure 510 * that the on-disk data is in a consistent state between updates. 511 */ 512 if (attr_scan(client_stream, ATTR_FLAG_STRICT, 513 ATTR_TYPE_STR, MAIL_ATTR_TABLE, request_map, 514 ATTR_TYPE_INT, MAIL_ATTR_FLAGS, &request_flags, 515 ATTR_TYPE_STR, MAIL_ATTR_KEY, request_key, 516 ATTR_TYPE_END) != 3) { 517 reply_status = PROXY_STAT_BAD; 518 } else if (proxy_writer == 0) { 519 msg_warn("refusing %s delete request on non-%s service", 520 STR(request_map), MAIL_SERVICE_PROXYWRITE); 521 reply_status = PROXY_STAT_DENY; 522 } else if ((dict = proxy_map_find(STR(request_map), request_flags, 523 &reply_status)) == 0) { 524 /* void */ ; 525 } else { 526 dict->flags = ((dict->flags & ~DICT_FLAG_RQST_MASK) 527 | (request_flags & DICT_FLAG_RQST_MASK) 528 | DICT_FLAG_SYNC_UPDATE); 529 dict_status = dict_del(dict, STR(request_key)); 530 if (dict_status == 0) { 531 reply_status = PROXY_STAT_OK; 532 } else if (dict->error == 0) { 533 reply_status = PROXY_STAT_NOKEY; 534 } else { 535 reply_status = PROXY_STAT_RETRY; 536 } 537 } 538 539 /* 540 * Respond to the client. 541 */ 542 attr_print(client_stream, ATTR_FLAG_NONE, 543 ATTR_TYPE_INT, MAIL_ATTR_STATUS, reply_status, 544 ATTR_TYPE_END); 545 } 546 547 /* proxymap_open_service - open remote lookup table */ 548 549 static void proxymap_open_service(VSTREAM *client_stream) 550 { 551 int request_flags; 552 DICT *dict; 553 int reply_status; 554 int reply_flags; 555 556 /* 557 * Process the request. 558 */ 559 if (attr_scan(client_stream, ATTR_FLAG_STRICT, 560 ATTR_TYPE_STR, MAIL_ATTR_TABLE, request_map, 561 ATTR_TYPE_INT, MAIL_ATTR_FLAGS, &request_flags, 562 ATTR_TYPE_END) != 2) { 563 reply_status = PROXY_STAT_BAD; 564 reply_flags = 0; 565 } else if ((dict = proxy_map_find(STR(request_map), request_flags, 566 &reply_status)) == 0) { 567 reply_flags = 0; 568 } else { 569 reply_status = PROXY_STAT_OK; 570 reply_flags = dict->flags; 571 } 572 573 /* 574 * Respond to the client. 575 */ 576 attr_print(client_stream, ATTR_FLAG_NONE, 577 ATTR_TYPE_INT, MAIL_ATTR_STATUS, reply_status, 578 ATTR_TYPE_INT, MAIL_ATTR_FLAGS, reply_flags, 579 ATTR_TYPE_END); 580 } 581 582 /* proxymap_service - perform service for client */ 583 584 static void proxymap_service(VSTREAM *client_stream, char *unused_service, 585 char **argv) 586 { 587 588 /* 589 * Sanity check. This service takes no command-line arguments. 590 */ 591 if (argv[0]) 592 msg_fatal("unexpected command-line argument: %s", argv[0]); 593 594 /* 595 * Deadline enforcement. 596 */ 597 if (vstream_fstat(client_stream, VSTREAM_FLAG_DEADLINE) == 0) 598 vstream_control(client_stream, 599 VSTREAM_CTL_TIMEOUT, 1, 600 VSTREAM_CTL_END); 601 602 /* 603 * This routine runs whenever a client connects to the socket dedicated 604 * to the proxymap service. All connection-management stuff is handled by 605 * the common code in multi_server.c. 606 */ 607 vstream_control(client_stream, 608 VSTREAM_CTL_START_DEADLINE, 609 VSTREAM_CTL_END); 610 if (attr_scan(client_stream, 611 ATTR_FLAG_MORE | ATTR_FLAG_STRICT, 612 ATTR_TYPE_STR, MAIL_ATTR_REQ, request, 613 ATTR_TYPE_END) == 1) { 614 if (VSTREQ(request, PROXY_REQ_LOOKUP)) { 615 proxymap_lookup_service(client_stream); 616 } else if (VSTREQ(request, PROXY_REQ_UPDATE)) { 617 proxymap_update_service(client_stream); 618 } else if (VSTREQ(request, PROXY_REQ_DELETE)) { 619 proxymap_delete_service(client_stream); 620 } else if (VSTREQ(request, PROXY_REQ_SEQUENCE)) { 621 proxymap_sequence_service(client_stream); 622 } else if (VSTREQ(request, PROXY_REQ_OPEN)) { 623 proxymap_open_service(client_stream); 624 } else { 625 msg_warn("unrecognized request: \"%s\", ignored", STR(request)); 626 attr_print(client_stream, ATTR_FLAG_NONE, 627 ATTR_TYPE_INT, MAIL_ATTR_STATUS, PROXY_STAT_BAD, 628 ATTR_TYPE_END); 629 } 630 } 631 vstream_control(client_stream, 632 VSTREAM_CTL_START_DEADLINE, 633 VSTREAM_CTL_END); 634 vstream_fflush(client_stream); 635 } 636 637 /* dict_proxy_open - intercept remote map request from inside library */ 638 639 DICT *dict_proxy_open(const char *map, int open_flags, int dict_flags) 640 { 641 if (msg_verbose) 642 msg_info("dict_proxy_open(%s, 0%o, 0%o) called from internal routine", 643 map, open_flags, dict_flags); 644 while (strncmp(map, PROXY_COLON, PROXY_COLON_LEN) == 0) 645 map += PROXY_COLON_LEN; 646 return (dict_open(map, open_flags, dict_flags)); 647 } 648 649 /* post_jail_init - initialization after privilege drop */ 650 651 static void post_jail_init(char *service_name, char **unused_argv) 652 { 653 const char *sep = ", \t\r\n"; 654 char *saved_filter; 655 char *bp; 656 char *type_name; 657 658 /* 659 * Are we proxy writer? 660 */ 661 if (strcmp(service_name, MAIL_SERVICE_PROXYWRITE) == 0) 662 proxy_writer = 1; 663 else if (strcmp(service_name, MAIL_SERVICE_PROXYMAP) != 0) 664 msg_fatal("service name must be one of %s or %s", 665 MAIL_SERVICE_PROXYMAP, MAIL_SERVICE_PROXYMAP); 666 667 /* 668 * Pre-allocate buffers. 669 */ 670 request = vstring_alloc(10); 671 request_map = vstring_alloc(10); 672 request_key = vstring_alloc(10); 673 request_value = vstring_alloc(10); 674 map_type_name_flags = vstring_alloc(10); 675 676 /* 677 * Prepare the pre-approved list of proxied tables. 678 */ 679 saved_filter = bp = mystrdup(proxy_writer ? var_proxy_write_maps : 680 var_proxy_read_maps); 681 proxy_auth_maps = htable_create(13); 682 while ((type_name = mystrtok(&bp, sep)) != 0) { 683 if (strncmp(type_name, PROXY_COLON, PROXY_COLON_LEN)) 684 continue; 685 do { 686 type_name += PROXY_COLON_LEN; 687 } while (!strncmp(type_name, PROXY_COLON, PROXY_COLON_LEN)); 688 if (strchr(type_name, ':') != 0 689 && htable_locate(proxy_auth_maps, type_name) == 0) 690 (void) htable_enter(proxy_auth_maps, type_name, (char *) 0); 691 } 692 myfree(saved_filter); 693 694 /* 695 * Never, ever, get killed by a master signal, as that could corrupt a 696 * persistent database when we're in the middle of an update. 697 */ 698 if (proxy_writer != 0) 699 setsid(); 700 } 701 702 /* pre_accept - see if tables have changed */ 703 704 static void pre_accept(char *unused_name, char **unused_argv) 705 { 706 const char *table; 707 708 if (proxy_writer == 0 && (table = dict_changed_name()) != 0) { 709 msg_info("table %s has changed -- restarting", table); 710 exit(0); 711 } 712 } 713 714 MAIL_VERSION_STAMP_DECLARE; 715 716 /* main - pass control to the multi-threaded skeleton */ 717 718 int main(int argc, char **argv) 719 { 720 static const CONFIG_STR_TABLE str_table[] = { 721 VAR_ALIAS_MAPS, DEF_ALIAS_MAPS, &var_alias_maps, 0, 0, 722 VAR_LOCAL_RCPT_MAPS, DEF_LOCAL_RCPT_MAPS, &var_local_rcpt_maps, 0, 0, 723 VAR_VIRT_ALIAS_MAPS, DEF_VIRT_ALIAS_MAPS, &var_virt_alias_maps, 0, 0, 724 VAR_VIRT_ALIAS_DOMS, DEF_VIRT_ALIAS_DOMS, &var_virt_alias_doms, 0, 0, 725 VAR_VIRT_MAILBOX_MAPS, DEF_VIRT_MAILBOX_MAPS, &var_virt_mailbox_maps, 0, 0, 726 VAR_VIRT_MAILBOX_DOMS, DEF_VIRT_MAILBOX_DOMS, &var_virt_mailbox_doms, 0, 0, 727 VAR_RELAY_RCPT_MAPS, DEF_RELAY_RCPT_MAPS, &var_relay_rcpt_maps, 0, 0, 728 VAR_RELAY_DOMAINS, DEF_RELAY_DOMAINS, &var_relay_domains, 0, 0, 729 VAR_CANONICAL_MAPS, DEF_CANONICAL_MAPS, &var_canonical_maps, 0, 0, 730 VAR_SEND_CANON_MAPS, DEF_SEND_CANON_MAPS, &var_send_canon_maps, 0, 0, 731 VAR_RCPT_CANON_MAPS, DEF_RCPT_CANON_MAPS, &var_rcpt_canon_maps, 0, 0, 732 VAR_RELOCATED_MAPS, DEF_RELOCATED_MAPS, &var_relocated_maps, 0, 0, 733 VAR_TRANSPORT_MAPS, DEF_TRANSPORT_MAPS, &var_transport_maps, 0, 0, 734 VAR_VERIFY_MAP, DEF_VERIFY_MAP, &var_verify_map, 0, 0, 735 VAR_PSC_CACHE_MAP, DEF_PSC_CACHE_MAP, &var_psc_cache_map, 0, 0, 736 /* The following two must be last for $mapname to work as expected. */ 737 VAR_PROXY_READ_MAPS, DEF_PROXY_READ_MAPS, &var_proxy_read_maps, 0, 0, 738 VAR_PROXY_WRITE_MAPS, DEF_PROXY_WRITE_MAPS, &var_proxy_write_maps, 0, 0, 739 0, 740 }; 741 742 /* 743 * Fingerprint executables and core dumps. 744 */ 745 MAIL_VERSION_STAMP_ALLOCATE; 746 747 multi_server_main(argc, argv, proxymap_service, 748 MAIL_SERVER_STR_TABLE, str_table, 749 MAIL_SERVER_POST_INIT, post_jail_init, 750 MAIL_SERVER_PRE_ACCEPT, pre_accept, 751 /* XXX MAIL_SERVER_SOLITARY if proxywrite */ 752 0); 753 } 754