1 /* $NetBSD: xsasl_dovecot_server.c,v 1.1.1.4 2012/02/17 08:36:25 tron 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 48 /* System library. */ 49 50 #include <sys_defs.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 55 #ifdef STRCASECMP_IN_STRINGS_H 56 #include <strings.h> 57 #endif 58 59 /* Utility library. */ 60 61 #include <msg.h> 62 #include <mymalloc.h> 63 #include <connect.h> 64 #include <split_at.h> 65 #include <stringops.h> 66 #include <vstream.h> 67 #include <vstring_vstream.h> 68 #include <name_mask.h> 69 #include <argv.h> 70 #include <myaddrinfo.h> 71 72 /* Global library. */ 73 74 #include <mail_params.h> 75 76 /* Application-specific. */ 77 78 #include <xsasl.h> 79 #include <xsasl_dovecot.h> 80 81 #ifdef USE_SASL_AUTH 82 83 /* Major version changes are not backwards compatible, 84 minor version numbers can be ignored. */ 85 #define AUTH_PROTOCOL_MAJOR_VERSION 1 86 #define AUTH_PROTOCOL_MINOR_VERSION 0 87 88 /* 89 * Encorce read/write time limits, so that we can produce accurate 90 * diagnostics instead of getting killed by the watchdog timer. 91 */ 92 #define AUTH_TIMEOUT 10 93 94 /* 95 * Security property bitmasks. 96 */ 97 #define SEC_PROPS_NOPLAINTEXT (1 << 0) 98 #define SEC_PROPS_NOACTIVE (1 << 1) 99 #define SEC_PROPS_NODICTIONARY (1 << 2) 100 #define SEC_PROPS_NOANONYMOUS (1 << 3) 101 #define SEC_PROPS_FWD_SECRECY (1 << 4) 102 #define SEC_PROPS_MUTUAL_AUTH (1 << 5) 103 #define SEC_PROPS_PRIVATE (1 << 6) 104 105 #define SEC_PROPS_POS_MASK (SEC_PROPS_MUTUAL_AUTH | SEC_PROPS_FWD_SECRECY) 106 #define SEC_PROPS_NEG_MASK (SEC_PROPS_NOPLAINTEXT | SEC_PROPS_NOACTIVE | \ 107 SEC_PROPS_NODICTIONARY | SEC_PROPS_NOANONYMOUS) 108 109 /* 110 * Security properties as specified in the Postfix main.cf file. 111 */ 112 static const NAME_MASK xsasl_dovecot_conf_sec_props[] = { 113 "noplaintext", SEC_PROPS_NOPLAINTEXT, 114 "noactive", SEC_PROPS_NOACTIVE, 115 "nodictionary", SEC_PROPS_NODICTIONARY, 116 "noanonymous", SEC_PROPS_NOANONYMOUS, 117 "forward_secrecy", SEC_PROPS_FWD_SECRECY, 118 "mutual_auth", SEC_PROPS_MUTUAL_AUTH, 119 0, 0, 120 }; 121 122 /* 123 * Security properties as specified in the Dovecot protocol. See 124 * http://wiki.dovecot.org/Authentication_Protocol. 125 */ 126 static const NAME_MASK xsasl_dovecot_serv_sec_props[] = { 127 "plaintext", SEC_PROPS_NOPLAINTEXT, 128 "active", SEC_PROPS_NOACTIVE, 129 "dictionary", SEC_PROPS_NODICTIONARY, 130 "anonymous", SEC_PROPS_NOANONYMOUS, 131 "forward-secrecy", SEC_PROPS_FWD_SECRECY, 132 "mutual-auth", SEC_PROPS_MUTUAL_AUTH, 133 "private", SEC_PROPS_PRIVATE, 134 0, 0, 135 }; 136 137 /* 138 * Class variables. 139 */ 140 typedef struct XSASL_DCSRV_MECH { 141 char *mech_name; /* mechanism name */ 142 int sec_props; /* mechanism properties */ 143 struct XSASL_DCSRV_MECH *next; 144 } XSASL_DCSRV_MECH; 145 146 typedef struct { 147 XSASL_SERVER_IMPL xsasl; 148 VSTREAM *sasl_stream; 149 char *socket_path; 150 XSASL_DCSRV_MECH *mechanism_list; /* unfiltered mechanism list */ 151 unsigned int request_id_counter; 152 } XSASL_DOVECOT_SERVER_IMPL; 153 154 /* 155 * The XSASL_DOVECOT_SERVER object is derived from the generic XSASL_SERVER 156 * object. 157 */ 158 typedef struct { 159 XSASL_SERVER xsasl; /* generic members, must be first */ 160 XSASL_DOVECOT_SERVER_IMPL *impl; 161 unsigned int last_request_id; 162 char *service; 163 char *username; /* authenticated user */ 164 VSTRING *sasl_line; 165 unsigned int sec_props; /* Postfix mechanism filter */ 166 int tls_flag; /* TLS enabled in this session */ 167 char *mechanism_list; /* filtered mechanism list */ 168 ARGV *mechanism_argv; /* ditto */ 169 char *client_addr; /* remote IP address */ 170 char *server_addr; /* remote IP address */ 171 } XSASL_DOVECOT_SERVER; 172 173 /* 174 * Forward declarations. 175 */ 176 static void xsasl_dovecot_server_done(XSASL_SERVER_IMPL *); 177 static XSASL_SERVER *xsasl_dovecot_server_create(XSASL_SERVER_IMPL *, 178 XSASL_SERVER_CREATE_ARGS *); 179 static void xsasl_dovecot_server_free(XSASL_SERVER *); 180 static int xsasl_dovecot_server_first(XSASL_SERVER *, const char *, 181 const char *, VSTRING *); 182 static int xsasl_dovecot_server_next(XSASL_SERVER *, const char *, VSTRING *); 183 static const char *xsasl_dovecot_server_get_mechanism_list(XSASL_SERVER *); 184 static const char *xsasl_dovecot_server_get_username(XSASL_SERVER *); 185 186 /* xsasl_dovecot_server_mech_append - append server mechanism entry */ 187 188 static void xsasl_dovecot_server_mech_append(XSASL_DCSRV_MECH **mech_list, 189 const char *mech_name, int sec_props) 190 { 191 XSASL_DCSRV_MECH **mpp; 192 XSASL_DCSRV_MECH *mp; 193 194 for (mpp = mech_list; *mpp != 0; mpp = &mpp[0]->next) 195 /* void */ ; 196 197 mp = (XSASL_DCSRV_MECH *) mymalloc(sizeof(*mp)); 198 mp->mech_name = mystrdup(mech_name); 199 mp->sec_props = sec_props; 200 mp->next = 0; 201 *mpp = mp; 202 } 203 204 /* xsasl_dovecot_server_mech_free - destroy server mechanism list */ 205 206 static void xsasl_dovecot_server_mech_free(XSASL_DCSRV_MECH *mech_list) 207 { 208 XSASL_DCSRV_MECH *mp; 209 XSASL_DCSRV_MECH *next; 210 211 for (mp = mech_list; mp != 0; mp = next) { 212 myfree(mp->mech_name); 213 next = mp->next; 214 myfree((char *) mp); 215 } 216 } 217 218 /* xsasl_dovecot_server_mech_filter - filter server mechanism list */ 219 220 static char *xsasl_dovecot_server_mech_filter(ARGV *mechanism_argv, 221 XSASL_DCSRV_MECH *mechanism_list, 222 unsigned int conf_props) 223 { 224 const char *myname = "xsasl_dovecot_server_mech_filter"; 225 unsigned int pos_conf_props = (conf_props & SEC_PROPS_POS_MASK); 226 unsigned int neg_conf_props = (conf_props & SEC_PROPS_NEG_MASK); 227 VSTRING *mechanisms_str = vstring_alloc(10); 228 XSASL_DCSRV_MECH *mp; 229 230 /* 231 * Match Postfix properties against Dovecot server properties. 232 */ 233 for (mp = mechanism_list; mp != 0; mp = mp->next) { 234 if ((mp->sec_props & pos_conf_props) == pos_conf_props 235 && (mp->sec_props & neg_conf_props) == 0) { 236 if (VSTRING_LEN(mechanisms_str) > 0) 237 VSTRING_ADDCH(mechanisms_str, ' '); 238 vstring_strcat(mechanisms_str, mp->mech_name); 239 argv_add(mechanism_argv, mp->mech_name, (char *) 0); 240 if (msg_verbose) 241 msg_info("%s: keep mechanism: %s", myname, mp->mech_name); 242 } else { 243 if (msg_verbose) 244 msg_info("%s: skip mechanism: %s", myname, mp->mech_name); 245 } 246 } 247 return (vstring_export(mechanisms_str)); 248 } 249 250 /* xsasl_dovecot_server_connect - initial auth server handshake */ 251 252 static int xsasl_dovecot_server_connect(XSASL_DOVECOT_SERVER_IMPL *xp) 253 { 254 const char *myname = "xsasl_dovecot_server_connect"; 255 VSTRING *line_str; 256 VSTREAM *sasl_stream; 257 char *line, *cmd, *mech_name; 258 unsigned int major_version, minor_version; 259 int fd, success; 260 int sec_props; 261 const char *path; 262 263 if (msg_verbose) 264 msg_info("%s: Connecting", myname); 265 266 /* 267 * Not documented, but necessary for testing. 268 */ 269 path = xp->socket_path; 270 if (strncmp(path, "inet:", 5) == 0) { 271 fd = inet_connect(path + 5, BLOCKING, AUTH_TIMEOUT); 272 } else { 273 if (strncmp(path, "unix:", 5) == 0) 274 path += 5; 275 fd = unix_connect(path, BLOCKING, AUTH_TIMEOUT); 276 } 277 if (fd < 0) { 278 msg_warn("SASL: Connect to %s failed: %m", xp->socket_path); 279 return (-1); 280 } 281 sasl_stream = vstream_fdopen(fd, O_RDWR); 282 vstream_control(sasl_stream, 283 VSTREAM_CTL_PATH, xp->socket_path, 284 VSTREAM_CTL_TIMEOUT, AUTH_TIMEOUT, 285 VSTREAM_CTL_END); 286 287 /* XXX Encapsulate for logging. */ 288 vstream_fprintf(sasl_stream, 289 "VERSION\t%u\t%u\n" 290 "CPID\t%u\n", 291 AUTH_PROTOCOL_MAJOR_VERSION, 292 AUTH_PROTOCOL_MINOR_VERSION, 293 (unsigned int) getpid()); 294 if (vstream_fflush(sasl_stream) == VSTREAM_EOF) { 295 msg_warn("SASL: Couldn't send handshake: %m"); 296 return (-1); 297 } 298 success = 0; 299 line_str = vstring_alloc(256); 300 /* XXX Encapsulate for logging. */ 301 while (vstring_get_nonl(line_str, sasl_stream) != VSTREAM_EOF) { 302 line = vstring_str(line_str); 303 304 if (msg_verbose) 305 msg_info("%s: auth reply: %s", myname, line); 306 307 cmd = line; 308 line = split_at(line, '\t'); 309 310 if (strcmp(cmd, "VERSION") == 0) { 311 if (sscanf(line, "%u\t%u", &major_version, &minor_version) != 2) { 312 msg_warn("SASL: Protocol version error"); 313 break; 314 } 315 if (major_version != AUTH_PROTOCOL_MAJOR_VERSION) { 316 /* Major version is different from ours. */ 317 msg_warn("SASL: Protocol version mismatch (%d vs. %d)", 318 major_version, AUTH_PROTOCOL_MAJOR_VERSION); 319 break; 320 } 321 } else if (strcmp(cmd, "MECH") == 0 && line != NULL) { 322 mech_name = line; 323 line = split_at(line, '\t'); 324 if (line != 0) { 325 sec_props = 326 name_mask_delim_opt(myname, 327 xsasl_dovecot_serv_sec_props, 328 line, "\t", 329 NAME_MASK_ANY_CASE | NAME_MASK_IGNORE); 330 if ((sec_props & SEC_PROPS_PRIVATE) != 0) 331 continue; 332 } else 333 sec_props = 0; 334 xsasl_dovecot_server_mech_append(&xp->mechanism_list, mech_name, 335 sec_props); 336 } else if (strcmp(cmd, "DONE") == 0) { 337 /* Handshake finished. */ 338 success = 1; 339 break; 340 } else { 341 /* ignore any unknown commands */ 342 } 343 } 344 vstring_free(line_str); 345 346 if (!success) { 347 /* handshake failed */ 348 (void) vstream_fclose(sasl_stream); 349 return (-1); 350 } 351 xp->sasl_stream = sasl_stream; 352 return (0); 353 } 354 355 /* xsasl_dovecot_server_disconnect - dispose of server connection state */ 356 357 static void xsasl_dovecot_server_disconnect(XSASL_DOVECOT_SERVER_IMPL *xp) 358 { 359 if (xp->sasl_stream) { 360 (void) vstream_fclose(xp->sasl_stream); 361 xp->sasl_stream = 0; 362 } 363 if (xp->mechanism_list) { 364 xsasl_dovecot_server_mech_free(xp->mechanism_list); 365 xp->mechanism_list = 0; 366 } 367 } 368 369 /* xsasl_dovecot_server_init - create implementation handle */ 370 371 XSASL_SERVER_IMPL *xsasl_dovecot_server_init(const char *server_type, 372 const char *path_info) 373 { 374 XSASL_DOVECOT_SERVER_IMPL *xp; 375 376 xp = (XSASL_DOVECOT_SERVER_IMPL *) mymalloc(sizeof(*xp)); 377 xp->xsasl.create = xsasl_dovecot_server_create; 378 xp->xsasl.done = xsasl_dovecot_server_done; 379 xp->socket_path = mystrdup(path_info); 380 xp->sasl_stream = 0; 381 xp->mechanism_list = 0; 382 xp->request_id_counter = 0; 383 return (&xp->xsasl); 384 } 385 386 /* xsasl_dovecot_server_done - dispose of implementation */ 387 388 static void xsasl_dovecot_server_done(XSASL_SERVER_IMPL *impl) 389 { 390 XSASL_DOVECOT_SERVER_IMPL *xp = (XSASL_DOVECOT_SERVER_IMPL *) impl; 391 392 xsasl_dovecot_server_disconnect(xp); 393 myfree(xp->socket_path); 394 myfree((char *) impl); 395 } 396 397 /* xsasl_dovecot_server_create - create server instance */ 398 399 static XSASL_SERVER *xsasl_dovecot_server_create(XSASL_SERVER_IMPL *impl, 400 XSASL_SERVER_CREATE_ARGS *args) 401 { 402 const char *myname = "xsasl_dovecot_server_create"; 403 XSASL_DOVECOT_SERVER *server; 404 struct sockaddr_storage ss; 405 struct sockaddr *sa = (struct sockaddr *) & ss; 406 SOCKADDR_SIZE salen; 407 MAI_HOSTADDR_STR server_addr; 408 409 if (msg_verbose) 410 msg_info("%s: SASL service=%s, realm=%s", 411 myname, args->service, args->user_realm ? 412 args->user_realm : "(null)"); 413 414 /* 415 * Extend the XSASL_SERVER_IMPL object with our own data. We use 416 * long-lived conversion buffers rather than local variables to avoid 417 * memory leaks in case of read/write timeout or I/O error. 418 */ 419 server = (XSASL_DOVECOT_SERVER *) mymalloc(sizeof(*server)); 420 server->xsasl.free = xsasl_dovecot_server_free; 421 server->xsasl.first = xsasl_dovecot_server_first; 422 server->xsasl.next = xsasl_dovecot_server_next; 423 server->xsasl.get_mechanism_list = xsasl_dovecot_server_get_mechanism_list; 424 server->xsasl.get_username = xsasl_dovecot_server_get_username; 425 server->impl = (XSASL_DOVECOT_SERVER_IMPL *) impl; 426 server->sasl_line = vstring_alloc(256); 427 server->username = 0; 428 server->service = mystrdup(args->service); 429 server->last_request_id = 0; 430 server->mechanism_list = 0; 431 server->mechanism_argv = 0; 432 server->tls_flag = args->tls_flag; 433 server->sec_props = 434 name_mask_opt(myname, xsasl_dovecot_conf_sec_props, 435 args->security_options, 436 NAME_MASK_ANY_CASE | NAME_MASK_FATAL); 437 server->client_addr = mystrdup(args->client_addr); 438 439 /* 440 * XXX Temporary code until smtpd_peer.c is updated. 441 */ 442 if (args->server_addr && *args->server_addr) { 443 server->server_addr = mystrdup(args->server_addr); 444 } else { 445 salen = sizeof(ss); 446 if (getsockname(vstream_fileno(args->stream), sa, &salen) < 0 447 || sockaddr_to_hostaddr(sa, salen, &server_addr, 0, 0) != 0) 448 server_addr.buf[0] = 0; 449 server->server_addr = mystrdup(server_addr.buf); 450 } 451 452 return (&server->xsasl); 453 } 454 455 /* xsasl_dovecot_server_get_mechanism_list - get available mechanisms */ 456 457 static const char *xsasl_dovecot_server_get_mechanism_list(XSASL_SERVER *xp) 458 { 459 XSASL_DOVECOT_SERVER *server = (XSASL_DOVECOT_SERVER *) xp; 460 461 if (!server->impl->sasl_stream) { 462 if (xsasl_dovecot_server_connect(server->impl) < 0) 463 return (0); 464 } 465 if (server->mechanism_list == 0) { 466 server->mechanism_argv = argv_alloc(2); 467 server->mechanism_list = 468 xsasl_dovecot_server_mech_filter(server->mechanism_argv, 469 server->impl->mechanism_list, 470 server->sec_props); 471 } 472 return (server->mechanism_list[0] ? server->mechanism_list : 0); 473 } 474 475 /* xsasl_dovecot_server_free - destroy server instance */ 476 477 static void xsasl_dovecot_server_free(XSASL_SERVER *xp) 478 { 479 XSASL_DOVECOT_SERVER *server = (XSASL_DOVECOT_SERVER *) xp; 480 481 vstring_free(server->sasl_line); 482 if (server->username) 483 myfree(server->username); 484 if (server->mechanism_list) { 485 myfree(server->mechanism_list); 486 argv_free(server->mechanism_argv); 487 } 488 myfree(server->service); 489 myfree(server->server_addr); 490 myfree(server->client_addr); 491 myfree((char *) server); 492 } 493 494 /* xsasl_dovecot_server_auth_response - encode server first/next response */ 495 496 static int xsasl_dovecot_parse_reply(XSASL_DOVECOT_SERVER *server, char **line) 497 { 498 char *id; 499 500 if (*line == NULL) { 501 msg_warn("SASL: Protocol error"); 502 return -1; 503 } 504 id = *line; 505 *line = split_at(*line, '\t'); 506 507 if (strtoul(id, NULL, 0) != server->last_request_id) { 508 /* reply to another request, shouldn't really happen.. */ 509 return -1; 510 } 511 return 0; 512 } 513 514 static void xsasl_dovecot_parse_reply_args(XSASL_DOVECOT_SERVER *server, 515 char *line, VSTRING *reply, 516 int success) 517 { 518 char *next; 519 520 if (server->username) { 521 myfree(server->username); 522 server->username = 0; 523 } 524 525 /* 526 * Note: TAB is part of the Dovecot protocol and must not appear in 527 * legitimate Dovecot usernames, otherwise the protocol would break. 528 */ 529 for (; line != NULL; line = next) { 530 next = split_at(line, '\t'); 531 if (strncmp(line, "user=", 5) == 0) { 532 server->username = mystrdup(line + 5); 533 printable(server->username, '?'); 534 } else if (strncmp(line, "reason=", 7) == 0) { 535 if (!success) { 536 printable(line + 7, '?'); 537 vstring_strcpy(reply, line + 7); 538 } 539 } 540 } 541 } 542 543 /* xsasl_dovecot_handle_reply - receive and process auth reply */ 544 545 static int xsasl_dovecot_handle_reply(XSASL_DOVECOT_SERVER *server, 546 VSTRING *reply) 547 { 548 const char *myname = "xsasl_dovecot_handle_reply"; 549 char *line, *cmd; 550 551 /* XXX Encapsulate for logging. */ 552 while (vstring_get_nonl(server->sasl_line, 553 server->impl->sasl_stream) != VSTREAM_EOF) { 554 line = vstring_str(server->sasl_line); 555 556 if (msg_verbose) 557 msg_info("%s: auth reply: %s", myname, line); 558 559 cmd = line; 560 line = split_at(line, '\t'); 561 562 if (strcmp(cmd, "OK") == 0) { 563 if (xsasl_dovecot_parse_reply(server, &line) == 0) { 564 /* authentication successful */ 565 xsasl_dovecot_parse_reply_args(server, line, reply, 1); 566 return XSASL_AUTH_DONE; 567 } 568 } else if (strcmp(cmd, "CONT") == 0) { 569 if (xsasl_dovecot_parse_reply(server, &line) == 0) { 570 vstring_strcpy(reply, line); 571 return XSASL_AUTH_MORE; 572 } 573 } else if (strcmp(cmd, "FAIL") == 0) { 574 if (xsasl_dovecot_parse_reply(server, &line) == 0) { 575 /* authentication failure */ 576 xsasl_dovecot_parse_reply_args(server, line, reply, 0); 577 return XSASL_AUTH_FAIL; 578 } 579 } else { 580 /* ignore */ 581 } 582 } 583 584 vstring_strcpy(reply, "Connection lost to authentication server"); 585 return XSASL_AUTH_FAIL; 586 } 587 588 /* is_valid_base64 - input sanitized */ 589 590 static int is_valid_base64(const char *data) 591 { 592 593 /* 594 * XXX Maybe use ISALNUM() (isascii && isalnum, i.e. locale independent). 595 */ 596 for (; *data != '\0'; data++) { 597 if (!((*data >= '0' && *data <= '9') || 598 (*data >= 'a' && *data <= 'z') || 599 (*data >= 'A' && *data <= 'Z') || 600 *data == '+' || *data == '/' || *data == '=')) 601 return 0; 602 } 603 return 1; 604 } 605 606 /* xsasl_dovecot_server_first - per-session authentication */ 607 608 int xsasl_dovecot_server_first(XSASL_SERVER *xp, const char *sasl_method, 609 const char *init_response, VSTRING *reply) 610 { 611 const char *myname = "xsasl_dovecot_server_first"; 612 XSASL_DOVECOT_SERVER *server = (XSASL_DOVECOT_SERVER *) xp; 613 int i; 614 char **cpp; 615 616 #define IFELSE(e1,e2,e3) ((e1) ? (e2) : (e3)) 617 618 if (msg_verbose) 619 msg_info("%s: sasl_method %s%s%s", myname, sasl_method, 620 IFELSE(init_response, ", init_response ", ""), 621 IFELSE(init_response, init_response, "")); 622 623 if (server->mechanism_argv == 0) 624 msg_panic("%s: no mechanism list", myname); 625 626 for (cpp = server->mechanism_argv->argv; /* see below */ ; cpp++) { 627 if (*cpp == 0) { 628 vstring_strcpy(reply, "Invalid authentication mechanism"); 629 return XSASL_AUTH_FAIL; 630 } 631 if (strcasecmp(sasl_method, *cpp) == 0) 632 break; 633 } 634 if (init_response) 635 if (!is_valid_base64(init_response)) { 636 vstring_strcpy(reply, "Invalid base64 data in initial response"); 637 return XSASL_AUTH_FAIL; 638 } 639 for (i = 0; i < 2; i++) { 640 if (!server->impl->sasl_stream) { 641 if (xsasl_dovecot_server_connect(server->impl) < 0) 642 return (0); 643 } 644 /* send the request */ 645 server->last_request_id = ++server->impl->request_id_counter; 646 /* XXX Encapsulate for logging. */ 647 vstream_fprintf(server->impl->sasl_stream, 648 "AUTH\t%u\t%s\tservice=%s\tnologin\tlip=%s\trip=%s", 649 server->last_request_id, sasl_method, 650 server->service, server->server_addr, 651 server->client_addr); 652 if (server->tls_flag) 653 /* XXX Encapsulate for logging. */ 654 vstream_fputs("\tsecured", server->impl->sasl_stream); 655 if (init_response) { 656 657 /* 658 * initial response is already base64 encoded, so we can send it 659 * directly. 660 */ 661 /* XXX Encapsulate for logging. */ 662 vstream_fprintf(server->impl->sasl_stream, 663 "\tresp=%s", init_response); 664 } 665 /* XXX Encapsulate for logging. */ 666 VSTREAM_PUTC('\n', server->impl->sasl_stream); 667 668 if (vstream_fflush(server->impl->sasl_stream) != VSTREAM_EOF) 669 break; 670 671 if (i == 1) { 672 vstring_strcpy(reply, "Can't connect to authentication server"); 673 return XSASL_AUTH_FAIL; 674 } 675 676 /* 677 * Reconnect and try again. 678 */ 679 xsasl_dovecot_server_disconnect(server->impl); 680 } 681 682 return xsasl_dovecot_handle_reply(server, reply); 683 } 684 685 /* xsasl_dovecot_server_next - continue authentication */ 686 687 static int xsasl_dovecot_server_next(XSASL_SERVER *xp, const char *request, 688 VSTRING *reply) 689 { 690 XSASL_DOVECOT_SERVER *server = (XSASL_DOVECOT_SERVER *) xp; 691 692 if (!is_valid_base64(request)) { 693 vstring_strcpy(reply, "Invalid base64 data in continued response"); 694 return XSASL_AUTH_FAIL; 695 } 696 /* XXX Encapsulate for logging. */ 697 vstream_fprintf(server->impl->sasl_stream, 698 "CONT\t%u\t%s\n", server->last_request_id, request); 699 if (vstream_fflush(server->impl->sasl_stream) == VSTREAM_EOF) { 700 vstring_strcpy(reply, "Connection lost to authentication server"); 701 return XSASL_AUTH_FAIL; 702 } 703 return xsasl_dovecot_handle_reply(server, reply); 704 } 705 706 /* xsasl_dovecot_server_get_username - get authenticated username */ 707 708 static const char *xsasl_dovecot_server_get_username(XSASL_SERVER *xp) 709 { 710 XSASL_DOVECOT_SERVER *server = (XSASL_DOVECOT_SERVER *) xp; 711 712 return (server->username); 713 } 714 715 #endif 716