1/* $NetBSD: xsasl_dovecot_server.c,v 1.4 2022/10/08 16:12:51 christos Exp $ */ 2 3/*++ 4/* NAME 5/* xsasl_dovecot_server 3 6/* SUMMARY 7/* Dovecot SASL server-side plug-in 8/* SYNOPSIS 9/* XSASL_SERVER_IMPL *xsasl_dovecot_server_init(server_type, appl_name) 10/* const char *server_type; 11/* const char *appl_name; 12/* DESCRIPTION 13/* This module implements the Dovecot SASL server-side authentication 14/* plug-in. 15/* 16/* .IP server_type 17/* The plug-in type that was specified to xsasl_server_init(). 18/* The argument is ignored, because the Dovecot plug-in 19/* implements only one plug-in type. 20/* .IP path_info 21/* The location of the Dovecot authentication server's UNIX-domain 22/* socket. Note: the Dovecot plug-in uses late binding, therefore 23/* all connect operations are done with Postfix privileges. 24/* DIAGNOSTICS 25/* Fatal: out of memory. 26/* 27/* Panic: interface violation. 28/* 29/* Other: the routines log a warning and return an error result 30/* as specified in xsasl_server(3). 31/* LICENSE 32/* .ad 33/* .fi 34/* The Secure Mailer license must be distributed with this software. 35/* AUTHOR(S) 36/* Initial implementation by: 37/* Timo Sirainen 38/* Procontrol 39/* Finland 40/* 41/* Adopted by: 42/* Wietse Venema 43/* IBM T.J. Watson Research 44/* P.O. Box 704 45/* Yorktown Heights, NY 10598, USA 46/* 47/* Wietse Venema 48/* Google, Inc. 49/* 111 8th Avenue 50/* New York, NY 10011, USA 51/*--*/ 52 53/* System library. */ 54 55#include <sys_defs.h> 56#include <stdio.h> 57#include <stdlib.h> 58#include <string.h> 59 60#ifdef STRCASECMP_IN_STRINGS_H 61#include <strings.h> 62#endif 63 64/* Utility library. */ 65 66#include <msg.h> 67#include <mymalloc.h> 68#include <connect.h> 69#include <split_at.h> 70#include <stringops.h> 71#include <vstream.h> 72#include <vstring_vstream.h> 73#include <name_mask.h> 74#include <argv.h> 75#include <myaddrinfo.h> 76 77/* Global library. */ 78 79#include <mail_params.h> 80 81/* Application-specific. */ 82 83#include <xsasl.h> 84#include <xsasl_dovecot.h> 85 86#ifdef USE_SASL_AUTH 87 88/* Major version changes are not backwards compatible, 89 minor version numbers can be ignored. */ 90#define AUTH_PROTOCOL_MAJOR_VERSION 1 91#define AUTH_PROTOCOL_MINOR_VERSION 0 92 93 /* 94 * Enforce read/write time limits, so that we can produce accurate 95 * diagnostics instead of getting killed by the watchdog timer. 96 */ 97#define AUTH_TIMEOUT 10 98 99 /* 100 * Security property bitmasks. 101 */ 102#define SEC_PROPS_NOPLAINTEXT (1 << 0) 103#define SEC_PROPS_NOACTIVE (1 << 1) 104#define SEC_PROPS_NODICTIONARY (1 << 2) 105#define SEC_PROPS_NOANONYMOUS (1 << 3) 106#define SEC_PROPS_FWD_SECRECY (1 << 4) 107#define SEC_PROPS_MUTUAL_AUTH (1 << 5) 108#define SEC_PROPS_PRIVATE (1 << 6) 109 110#define SEC_PROPS_POS_MASK (SEC_PROPS_MUTUAL_AUTH | SEC_PROPS_FWD_SECRECY) 111#define SEC_PROPS_NEG_MASK (SEC_PROPS_NOPLAINTEXT | SEC_PROPS_NOACTIVE | \ 112 SEC_PROPS_NODICTIONARY | SEC_PROPS_NOANONYMOUS) 113 114 /* 115 * Security properties as specified in the Postfix main.cf file. 116 */ 117static const NAME_MASK xsasl_dovecot_conf_sec_props[] = { 118 "noplaintext", SEC_PROPS_NOPLAINTEXT, 119 "noactive", SEC_PROPS_NOACTIVE, 120 "nodictionary", SEC_PROPS_NODICTIONARY, 121 "noanonymous", SEC_PROPS_NOANONYMOUS, 122 "forward_secrecy", SEC_PROPS_FWD_SECRECY, 123 "mutual_auth", SEC_PROPS_MUTUAL_AUTH, 124 0, 0, 125}; 126 127 /* 128 * Security properties as specified in the Dovecot protocol. See 129 * http://wiki.dovecot.org/Authentication_Protocol. 130 */ 131static const NAME_MASK xsasl_dovecot_serv_sec_props[] = { 132 "plaintext", SEC_PROPS_NOPLAINTEXT, 133 "active", SEC_PROPS_NOACTIVE, 134 "dictionary", SEC_PROPS_NODICTIONARY, 135 "anonymous", SEC_PROPS_NOANONYMOUS, 136 "forward-secrecy", SEC_PROPS_FWD_SECRECY, 137 "mutual-auth", SEC_PROPS_MUTUAL_AUTH, 138 "private", SEC_PROPS_PRIVATE, 139 0, 0, 140}; 141 142 /* 143 * Class variables. 144 */ 145typedef struct XSASL_DCSRV_MECH { 146 char *mech_name; /* mechanism name */ 147 int sec_props; /* mechanism properties */ 148 struct XSASL_DCSRV_MECH *next; 149} XSASL_DCSRV_MECH; 150 151typedef struct { 152 XSASL_SERVER_IMPL xsasl; 153 VSTREAM *sasl_stream; 154 char *socket_path; 155 XSASL_DCSRV_MECH *mechanism_list; /* unfiltered mechanism list */ 156 unsigned int request_id_counter; 157} XSASL_DOVECOT_SERVER_IMPL; 158 159 /* 160 * The XSASL_DOVECOT_SERVER object is derived from the generic XSASL_SERVER 161 * object. 162 */ 163typedef struct { 164 XSASL_SERVER xsasl; /* generic members, must be first */ 165 XSASL_DOVECOT_SERVER_IMPL *impl; 166 unsigned int last_request_id; 167 char *service; 168 char *username; /* authenticated user */ 169 VSTRING *sasl_line; 170 unsigned int sec_props; /* Postfix mechanism filter */ 171 int tls_flag; /* TLS enabled in this session */ 172 char *mechanism_list; /* filtered mechanism list */ 173 ARGV *mechanism_argv; /* ditto */ 174 char *client_addr; /* remote IP address */ 175 char *server_addr; /* remote IP address */ 176} XSASL_DOVECOT_SERVER; 177 178 /* 179 * Forward declarations. 180 */ 181static void xsasl_dovecot_server_done(XSASL_SERVER_IMPL *); 182static XSASL_SERVER *xsasl_dovecot_server_create(XSASL_SERVER_IMPL *, 183 XSASL_SERVER_CREATE_ARGS *); 184static void xsasl_dovecot_server_free(XSASL_SERVER *); 185static int xsasl_dovecot_server_first(XSASL_SERVER *, const char *, 186 const char *, VSTRING *); 187static int xsasl_dovecot_server_next(XSASL_SERVER *, const char *, VSTRING *); 188static const char *xsasl_dovecot_server_get_mechanism_list(XSASL_SERVER *); 189static const char *xsasl_dovecot_server_get_username(XSASL_SERVER *); 190 191/* xsasl_dovecot_server_mech_append - append server mechanism entry */ 192 193static void xsasl_dovecot_server_mech_append(XSASL_DCSRV_MECH **mech_list, 194 const char *mech_name, int sec_props) 195{ 196 XSASL_DCSRV_MECH **mpp; 197 XSASL_DCSRV_MECH *mp; 198 199 for (mpp = mech_list; *mpp != 0; mpp = &mpp[0]->next) 200 /* void */ ; 201 202 mp = (XSASL_DCSRV_MECH *) mymalloc(sizeof(*mp)); 203 mp->mech_name = mystrdup(mech_name); 204 mp->sec_props = sec_props; 205 mp->next = 0; 206 *mpp = mp; 207} 208 209/* xsasl_dovecot_server_mech_free - destroy server mechanism list */ 210 211static void xsasl_dovecot_server_mech_free(XSASL_DCSRV_MECH *mech_list) 212{ 213 XSASL_DCSRV_MECH *mp; 214 XSASL_DCSRV_MECH *next; 215 216 for (mp = mech_list; mp != 0; mp = next) { 217 myfree(mp->mech_name); 218 next = mp->next; 219 myfree((void *) mp); 220 } 221} 222 223/* xsasl_dovecot_server_mech_filter - filter server mechanism list */ 224 225static char *xsasl_dovecot_server_mech_filter(ARGV *mechanism_argv, 226 XSASL_DCSRV_MECH *mechanism_list, 227 unsigned int conf_props) 228{ 229 const char *myname = "xsasl_dovecot_server_mech_filter"; 230 unsigned int pos_conf_props = (conf_props & SEC_PROPS_POS_MASK); 231 unsigned int neg_conf_props = (conf_props & SEC_PROPS_NEG_MASK); 232 VSTRING *mechanisms_str = vstring_alloc(10); 233 XSASL_DCSRV_MECH *mp; 234 235 /* 236 * Match Postfix properties against Dovecot server properties. 237 */ 238 for (mp = mechanism_list; mp != 0; mp = mp->next) { 239 if ((mp->sec_props & pos_conf_props) == pos_conf_props 240 && (mp->sec_props & neg_conf_props) == 0) { 241 if (VSTRING_LEN(mechanisms_str) > 0) 242 VSTRING_ADDCH(mechanisms_str, ' '); 243 vstring_strcat(mechanisms_str, mp->mech_name); 244 argv_add(mechanism_argv, mp->mech_name, (char *) 0); 245 if (msg_verbose) 246 msg_info("%s: keep mechanism: %s", myname, mp->mech_name); 247 } else { 248 if (msg_verbose) 249 msg_info("%s: skip mechanism: %s", myname, mp->mech_name); 250 } 251 } 252 return (vstring_export(mechanisms_str)); 253} 254 255/* xsasl_dovecot_server_connect - initial auth server handshake */ 256 257static int xsasl_dovecot_server_connect(XSASL_DOVECOT_SERVER_IMPL *xp) 258{ 259 const char *myname = "xsasl_dovecot_server_connect"; 260 VSTRING *line_str; 261 VSTREAM *sasl_stream; 262 char *line, *cmd, *mech_name; 263 unsigned int major_version, minor_version; 264 int fd, success, have_mech_line; 265 int sec_props; 266 const char *path; 267 268 if (msg_verbose) 269 msg_info("%s: Connecting", myname); 270 271 /* 272 * Not documented, but necessary for testing. 273 */ 274 path = xp->socket_path; 275 if (strncmp(path, "inet:", 5) == 0) { 276 fd = inet_connect(path + 5, BLOCKING, AUTH_TIMEOUT); 277 } else { 278 if (strncmp(path, "unix:", 5) == 0) 279 path += 5; 280 fd = unix_connect(path, BLOCKING, AUTH_TIMEOUT); 281 } 282 if (fd < 0) { 283 msg_warn("SASL: Connect to Dovecot auth socket '%s' failed: %m", 284 xp->socket_path); 285 return (-1); 286 } 287 sasl_stream = vstream_fdopen(fd, O_RDWR); 288 vstream_control(sasl_stream, 289 CA_VSTREAM_CTL_PATH(xp->socket_path), 290 CA_VSTREAM_CTL_TIMEOUT(AUTH_TIMEOUT), 291 CA_VSTREAM_CTL_END); 292 293 /* XXX Encapsulate for logging. */ 294 vstream_fprintf(sasl_stream, 295 "VERSION\t%u\t%u\n" 296 "CPID\t%u\n", 297 AUTH_PROTOCOL_MAJOR_VERSION, 298 AUTH_PROTOCOL_MINOR_VERSION, 299 (unsigned int) getpid()); 300 if (vstream_fflush(sasl_stream) == VSTREAM_EOF) { 301 msg_warn("SASL: Couldn't send handshake: %m"); 302 return (-1); 303 } 304 success = 0; 305 have_mech_line = 0; 306 line_str = vstring_alloc(256); 307 /* XXX Encapsulate for logging. */ 308 while (vstring_get_nonl(line_str, sasl_stream) != VSTREAM_EOF) { 309 line = vstring_str(line_str); 310 311 if (msg_verbose) 312 msg_info("%s: auth reply: %s", myname, line); 313 314 cmd = line; 315 line = split_at(line, '\t'); 316 317 if (strcmp(cmd, "VERSION") == 0) { 318 if (sscanf(line, "%u\t%u", &major_version, &minor_version) != 2) { 319 msg_warn("SASL: Protocol version error"); 320 break; 321 } 322 if (major_version != AUTH_PROTOCOL_MAJOR_VERSION) { 323 /* Major version is different from ours. */ 324 msg_warn("SASL: Protocol version mismatch (%d vs. %d)", 325 major_version, AUTH_PROTOCOL_MAJOR_VERSION); 326 break; 327 } 328 } else if (strcmp(cmd, "MECH") == 0 && line != NULL) { 329 mech_name = line; 330 have_mech_line = 1; 331 line = split_at(line, '\t'); 332 if (line != 0) { 333 sec_props = 334 name_mask_delim_opt(myname, 335 xsasl_dovecot_serv_sec_props, 336 line, "\t", 337 NAME_MASK_ANY_CASE | NAME_MASK_IGNORE); 338 if ((sec_props & SEC_PROPS_PRIVATE) != 0) 339 continue; 340 } else 341 sec_props = 0; 342 xsasl_dovecot_server_mech_append(&xp->mechanism_list, mech_name, 343 sec_props); 344 } else if (strcmp(cmd, "SPID") == 0) { 345 346 /* 347 * Unfortunately the auth protocol handshake wasn't designed well 348 * to differentiate between auth-client/userdb/master. 349 * auth-userdb and auth-master send VERSION + SPID lines only and 350 * nothing afterwards, while auth-client sends VERSION + MECH + 351 * SPID + CUID + more. The simplest way that we can determine if 352 * we've connected to the correct socket is to see if MECH line 353 * exists or not (alternatively we'd have to have a small timeout 354 * after SPID to see if CUID is sent or not). 355 */ 356 if (!have_mech_line) { 357 msg_warn("SASL: Connected to wrong auth socket (auth-master instead of auth-client)"); 358 break; 359 } 360 } else if (strcmp(cmd, "DONE") == 0) { 361 /* Handshake finished. */ 362 success = 1; 363 break; 364 } else { 365 /* ignore any unknown commands */ 366 } 367 } 368 vstring_free(line_str); 369 370 if (!success) { 371 /* handshake failed */ 372 (void) vstream_fclose(sasl_stream); 373 return (-1); 374 } 375 xp->sasl_stream = sasl_stream; 376 return (0); 377} 378 379/* xsasl_dovecot_server_disconnect - dispose of server connection state */ 380 381static void xsasl_dovecot_server_disconnect(XSASL_DOVECOT_SERVER_IMPL *xp) 382{ 383 if (xp->sasl_stream) { 384 (void) vstream_fclose(xp->sasl_stream); 385 xp->sasl_stream = 0; 386 } 387 if (xp->mechanism_list) { 388 xsasl_dovecot_server_mech_free(xp->mechanism_list); 389 xp->mechanism_list = 0; 390 } 391} 392 393/* xsasl_dovecot_server_init - create implementation handle */ 394 395XSASL_SERVER_IMPL *xsasl_dovecot_server_init(const char *server_type, 396 const char *path_info) 397{ 398 XSASL_DOVECOT_SERVER_IMPL *xp; 399 400 xp = (XSASL_DOVECOT_SERVER_IMPL *) mymalloc(sizeof(*xp)); 401 xp->xsasl.create = xsasl_dovecot_server_create; 402 xp->xsasl.done = xsasl_dovecot_server_done; 403 xp->socket_path = mystrdup(path_info); 404 xp->sasl_stream = 0; 405 xp->mechanism_list = 0; 406 xp->request_id_counter = 0; 407 return (&xp->xsasl); 408} 409 410/* xsasl_dovecot_server_done - dispose of implementation */ 411 412static void xsasl_dovecot_server_done(XSASL_SERVER_IMPL *impl) 413{ 414 XSASL_DOVECOT_SERVER_IMPL *xp = (XSASL_DOVECOT_SERVER_IMPL *) impl; 415 416 xsasl_dovecot_server_disconnect(xp); 417 myfree(xp->socket_path); 418 myfree((void *) impl); 419} 420 421/* xsasl_dovecot_server_create - create server instance */ 422 423static XSASL_SERVER *xsasl_dovecot_server_create(XSASL_SERVER_IMPL *impl, 424 XSASL_SERVER_CREATE_ARGS *args) 425{ 426 const char *myname = "xsasl_dovecot_server_create"; 427 XSASL_DOVECOT_SERVER *server; 428 struct sockaddr_storage ss; 429 struct sockaddr *sa = (struct sockaddr *) &ss; 430 SOCKADDR_SIZE salen; 431 MAI_HOSTADDR_STR server_addr; 432 433 if (msg_verbose) 434 msg_info("%s: SASL service=%s, realm=%s", 435 myname, args->service, args->user_realm ? 436 args->user_realm : "(null)"); 437 438 /* 439 * Extend the XSASL_SERVER_IMPL object with our own data. We use 440 * long-lived conversion buffers rather than local variables to avoid 441 * memory leaks in case of read/write timeout or I/O error. 442 */ 443 server = (XSASL_DOVECOT_SERVER *) mymalloc(sizeof(*server)); 444 server->xsasl.free = xsasl_dovecot_server_free; 445 server->xsasl.first = xsasl_dovecot_server_first; 446 server->xsasl.next = xsasl_dovecot_server_next; 447 server->xsasl.get_mechanism_list = xsasl_dovecot_server_get_mechanism_list; 448 server->xsasl.get_username = xsasl_dovecot_server_get_username; 449 server->impl = (XSASL_DOVECOT_SERVER_IMPL *) impl; 450 server->sasl_line = vstring_alloc(256); 451 server->username = 0; 452 server->service = mystrdup(args->service); 453 server->last_request_id = 0; 454 server->mechanism_list = 0; 455 server->mechanism_argv = 0; 456 server->tls_flag = args->tls_flag; 457 server->sec_props = 458 name_mask_opt(myname, xsasl_dovecot_conf_sec_props, 459 args->security_options, 460 NAME_MASK_ANY_CASE | NAME_MASK_FATAL); 461 server->client_addr = mystrdup(args->client_addr); 462 463 /* 464 * XXX Temporary code until smtpd_peer.c is updated. 465 */ 466 if (args->server_addr && *args->server_addr) { 467 server->server_addr = mystrdup(args->server_addr); 468 } else { 469 salen = sizeof(ss); 470 if (getsockname(vstream_fileno(args->stream), sa, &salen) < 0 471 || sockaddr_to_hostaddr(sa, salen, &server_addr, 0, 0) != 0) 472 server_addr.buf[0] = 0; 473 server->server_addr = mystrdup(server_addr.buf); 474 } 475 476 return (&server->xsasl); 477} 478 479/* xsasl_dovecot_server_get_mechanism_list - get available mechanisms */ 480 481static const char *xsasl_dovecot_server_get_mechanism_list(XSASL_SERVER *xp) 482{ 483 XSASL_DOVECOT_SERVER *server = (XSASL_DOVECOT_SERVER *) xp; 484 485 if (!server->impl->sasl_stream) { 486 if (xsasl_dovecot_server_connect(server->impl) < 0) 487 return (0); 488 } 489 if (server->mechanism_list == 0) { 490 server->mechanism_argv = argv_alloc(2); 491 server->mechanism_list = 492 xsasl_dovecot_server_mech_filter(server->mechanism_argv, 493 server->impl->mechanism_list, 494 server->sec_props); 495 } 496 return (server->mechanism_list[0] ? server->mechanism_list : 0); 497} 498 499/* xsasl_dovecot_server_free - destroy server instance */ 500 501static void xsasl_dovecot_server_free(XSASL_SERVER *xp) 502{ 503 XSASL_DOVECOT_SERVER *server = (XSASL_DOVECOT_SERVER *) xp; 504 505 vstring_free(server->sasl_line); 506 if (server->username) 507 myfree(server->username); 508 if (server->mechanism_list) { 509 myfree(server->mechanism_list); 510 argv_free(server->mechanism_argv); 511 } 512 myfree(server->service); 513 myfree(server->server_addr); 514 myfree(server->client_addr); 515 myfree((void *) server); 516} 517 518/* xsasl_dovecot_server_auth_response - encode server first/next response */ 519 520static int xsasl_dovecot_parse_reply(XSASL_DOVECOT_SERVER *server, char **line) 521{ 522 char *id; 523 524 if (*line == NULL) { 525 msg_warn("SASL: Protocol error"); 526 return -1; 527 } 528 id = *line; 529 *line = split_at(*line, '\t'); 530 531 if (strtoul(id, NULL, 0) != server->last_request_id) { 532 /* reply to another request, shouldn't really happen.. */ 533 return -1; 534 } 535 return 0; 536} 537 538static void xsasl_dovecot_parse_reply_args(XSASL_DOVECOT_SERVER *server, 539 char *line, VSTRING *reply, 540 int success) 541{ 542 char *next; 543 544 if (server->username) { 545 myfree(server->username); 546 server->username = 0; 547 } 548 549 /* 550 * Note: TAB is part of the Dovecot protocol and must not appear in 551 * legitimate Dovecot usernames, otherwise the protocol would break. 552 */ 553 for (; line != NULL; line = next) { 554 next = split_at(line, '\t'); 555 if (strncmp(line, "user=", 5) == 0) { 556 server->username = mystrdup(line + 5); 557 printable(server->username, '?'); 558 } else if (strncmp(line, "reason=", 7) == 0) { 559 if (!success) { 560 printable(line + 7, '?'); 561 vstring_strcpy(reply, line + 7); 562 } 563 } 564 } 565} 566 567/* xsasl_dovecot_handle_reply - receive and process auth reply */ 568 569static int xsasl_dovecot_handle_reply(XSASL_DOVECOT_SERVER *server, 570 VSTRING *reply) 571{ 572 const char *myname = "xsasl_dovecot_handle_reply"; 573 char *line, *cmd; 574 575 /* XXX Encapsulate for logging. */ 576 while (vstring_get_nonl(server->sasl_line, 577 server->impl->sasl_stream) != VSTREAM_EOF) { 578 line = vstring_str(server->sasl_line); 579 580 if (msg_verbose) 581 msg_info("%s: auth reply: %s", myname, line); 582 583 cmd = line; 584 line = split_at(line, '\t'); 585 586 if (strcmp(cmd, "OK") == 0) { 587 if (xsasl_dovecot_parse_reply(server, &line) == 0) { 588 /* authentication successful */ 589 xsasl_dovecot_parse_reply_args(server, line, reply, 1); 590 if (server->username == 0) { 591 msg_warn("missing Dovecot server %s username field", cmd); 592 vstring_strcpy(reply, "Authentication backend error"); 593 return XSASL_AUTH_FAIL; 594 } 595 return XSASL_AUTH_DONE; 596 } 597 } else if (strcmp(cmd, "CONT") == 0) { 598 if (xsasl_dovecot_parse_reply(server, &line) == 0) { 599 if (line == 0) { 600 msg_warn("missing Dovecot server %s reply field", cmd); 601 vstring_strcpy(reply, "Authentication backend error"); 602 return XSASL_AUTH_FAIL; 603 } 604 vstring_strcpy(reply, line); 605 return XSASL_AUTH_MORE; 606 } 607 } else if (strcmp(cmd, "FAIL") == 0) { 608 if (xsasl_dovecot_parse_reply(server, &line) == 0) { 609 /* authentication failure */ 610 xsasl_dovecot_parse_reply_args(server, line, reply, 0); 611 return XSASL_AUTH_FAIL; 612 } 613 } else { 614 /* ignore */ 615 } 616 } 617 618 vstring_strcpy(reply, "Connection lost to authentication server"); 619 return XSASL_AUTH_TEMP; 620} 621 622/* is_valid_base64 - input sanitized */ 623 624static int is_valid_base64(const char *data) 625{ 626 627 /* 628 * XXX Maybe use ISALNUM() (isascii && isalnum, i.e. locale independent). 629 */ 630 for (; *data != '\0'; data++) { 631 if (!((*data >= '0' && *data <= '9') || 632 (*data >= 'a' && *data <= 'z') || 633 (*data >= 'A' && *data <= 'Z') || 634 *data == '+' || *data == '/' || *data == '=')) 635 return 0; 636 } 637 return 1; 638} 639 640/* xsasl_dovecot_server_first - per-session authentication */ 641 642int xsasl_dovecot_server_first(XSASL_SERVER *xp, const char *sasl_method, 643 const char *init_response, VSTRING *reply) 644{ 645 const char *myname = "xsasl_dovecot_server_first"; 646 XSASL_DOVECOT_SERVER *server = (XSASL_DOVECOT_SERVER *) xp; 647 int i; 648 char **cpp; 649 650#define IFELSE(e1,e2,e3) ((e1) ? (e2) : (e3)) 651 652 if (msg_verbose) 653 msg_info("%s: sasl_method %s%s%s", myname, sasl_method, 654 IFELSE(init_response, ", init_response ", ""), 655 IFELSE(init_response, init_response, "")); 656 657 if (server->mechanism_argv == 0) 658 msg_panic("%s: no mechanism list", myname); 659 660 for (cpp = server->mechanism_argv->argv; /* see below */ ; cpp++) { 661 if (*cpp == 0) { 662 vstring_strcpy(reply, "Invalid authentication mechanism"); 663 return XSASL_AUTH_FAIL; 664 } 665 if (strcasecmp(sasl_method, *cpp) == 0) 666 break; 667 } 668 if (init_response) 669 if (!is_valid_base64(init_response)) { 670 vstring_strcpy(reply, "Invalid base64 data in initial response"); 671 return XSASL_AUTH_FAIL; 672 } 673 for (i = 0; i < 2; i++) { 674 if (!server->impl->sasl_stream) { 675 if (xsasl_dovecot_server_connect(server->impl) < 0) 676 return XSASL_AUTH_TEMP; 677 } 678 /* send the request */ 679 server->last_request_id = ++server->impl->request_id_counter; 680 /* XXX Encapsulate for logging. */ 681 vstream_fprintf(server->impl->sasl_stream, 682 "AUTH\t%u\t%s\tservice=%s\tnologin\tlip=%s\trip=%s", 683 server->last_request_id, sasl_method, 684 server->service, server->server_addr, 685 server->client_addr); 686 if (server->tls_flag) 687 /* XXX Encapsulate for logging. */ 688 vstream_fputs("\tsecured", server->impl->sasl_stream); 689 if (init_response) { 690 691 /* 692 * initial response is already base64 encoded, so we can send it 693 * directly. 694 */ 695 /* XXX Encapsulate for logging. */ 696 vstream_fprintf(server->impl->sasl_stream, 697 "\tresp=%s", init_response); 698 } 699 /* XXX Encapsulate for logging. */ 700 VSTREAM_PUTC('\n', server->impl->sasl_stream); 701 702 if (vstream_fflush(server->impl->sasl_stream) != VSTREAM_EOF) 703 break; 704 705 if (i == 1) { 706 vstring_strcpy(reply, "Can't connect to authentication server"); 707 return XSASL_AUTH_TEMP; 708 } 709 710 /* 711 * Reconnect and try again. 712 */ 713 xsasl_dovecot_server_disconnect(server->impl); 714 } 715 716 return xsasl_dovecot_handle_reply(server, reply); 717} 718 719/* xsasl_dovecot_server_next - continue authentication */ 720 721static int xsasl_dovecot_server_next(XSASL_SERVER *xp, const char *request, 722 VSTRING *reply) 723{ 724 XSASL_DOVECOT_SERVER *server = (XSASL_DOVECOT_SERVER *) xp; 725 726 if (!is_valid_base64(request)) { 727 vstring_strcpy(reply, "Invalid base64 data in continued response"); 728 return XSASL_AUTH_FAIL; 729 } 730 /* XXX Encapsulate for logging. */ 731 vstream_fprintf(server->impl->sasl_stream, 732 "CONT\t%u\t%s\n", server->last_request_id, request); 733 if (vstream_fflush(server->impl->sasl_stream) == VSTREAM_EOF) { 734 vstring_strcpy(reply, "Connection lost to authentication server"); 735 return XSASL_AUTH_TEMP; 736 } 737 return xsasl_dovecot_handle_reply(server, reply); 738} 739 740/* xsasl_dovecot_server_get_username - get authenticated username */ 741 742static const char *xsasl_dovecot_server_get_username(XSASL_SERVER *xp) 743{ 744 XSASL_DOVECOT_SERVER *server = (XSASL_DOVECOT_SERVER *) xp; 745 746 return (server->username); 747} 748 749#endif 750