1 /* 2 * hostapd / RADIUS client 3 * Copyright (c) 2002-2005, Jouni Malinen <j@w1.fi> 4 * 5 * This program is free software; you can redistribute it and/or modify 6 * it under the terms of the GNU General Public License version 2 as 7 * published by the Free Software Foundation. 8 * 9 * Alternatively, this software may be distributed under the terms of BSD 10 * license. 11 * 12 * See README and COPYING for more details. 13 */ 14 15 #include "includes.h" 16 17 #include "common.h" 18 #include "radius.h" 19 #include "radius_client.h" 20 #include "eloop.h" 21 22 /* Defaults for RADIUS retransmit values (exponential backoff) */ 23 #define RADIUS_CLIENT_FIRST_WAIT 3 /* seconds */ 24 #define RADIUS_CLIENT_MAX_WAIT 120 /* seconds */ 25 #define RADIUS_CLIENT_MAX_RETRIES 10 /* maximum number of retransmit attempts 26 * before entry is removed from retransmit 27 * list */ 28 #define RADIUS_CLIENT_MAX_ENTRIES 30 /* maximum number of entries in retransmit 29 * list (oldest will be removed, if this 30 * limit is exceeded) */ 31 #define RADIUS_CLIENT_NUM_FAILOVER 4 /* try to change RADIUS server after this 32 * many failed retry attempts */ 33 34 35 struct radius_rx_handler { 36 RadiusRxResult (*handler)(struct radius_msg *msg, 37 struct radius_msg *req, 38 const u8 *shared_secret, 39 size_t shared_secret_len, 40 void *data); 41 void *data; 42 }; 43 44 45 /* RADIUS message retransmit list */ 46 struct radius_msg_list { 47 u8 addr[ETH_ALEN]; /* STA/client address; used to find RADIUS messages 48 * for the same STA. */ 49 struct radius_msg *msg; 50 RadiusType msg_type; 51 os_time_t first_try; 52 os_time_t next_try; 53 int attempts; 54 int next_wait; 55 struct os_time last_attempt; 56 57 u8 *shared_secret; 58 size_t shared_secret_len; 59 60 /* TODO: server config with failover to backup server(s) */ 61 62 struct radius_msg_list *next; 63 }; 64 65 66 struct radius_client_data { 67 void *ctx; 68 struct hostapd_radius_servers *conf; 69 70 int auth_serv_sock; /* socket for authentication RADIUS messages */ 71 int acct_serv_sock; /* socket for accounting RADIUS messages */ 72 int auth_serv_sock6; 73 int acct_serv_sock6; 74 int auth_sock; /* currently used socket */ 75 int acct_sock; /* currently used socket */ 76 77 struct radius_rx_handler *auth_handlers; 78 size_t num_auth_handlers; 79 struct radius_rx_handler *acct_handlers; 80 size_t num_acct_handlers; 81 82 struct radius_msg_list *msgs; 83 size_t num_msgs; 84 85 u8 next_radius_identifier; 86 }; 87 88 89 static int 90 radius_change_server(struct radius_client_data *radius, 91 struct hostapd_radius_server *nserv, 92 struct hostapd_radius_server *oserv, 93 int sock, int sock6, int auth); 94 static int radius_client_init_acct(struct radius_client_data *radius); 95 static int radius_client_init_auth(struct radius_client_data *radius); 96 97 98 static void radius_client_msg_free(struct radius_msg_list *req) 99 { 100 radius_msg_free(req->msg); 101 os_free(req->msg); 102 os_free(req); 103 } 104 105 106 int radius_client_register(struct radius_client_data *radius, 107 RadiusType msg_type, 108 RadiusRxResult (*handler)(struct radius_msg *msg, 109 struct radius_msg *req, 110 const u8 *shared_secret, 111 size_t shared_secret_len, 112 void *data), 113 void *data) 114 { 115 struct radius_rx_handler **handlers, *newh; 116 size_t *num; 117 118 if (msg_type == RADIUS_ACCT) { 119 handlers = &radius->acct_handlers; 120 num = &radius->num_acct_handlers; 121 } else { 122 handlers = &radius->auth_handlers; 123 num = &radius->num_auth_handlers; 124 } 125 126 newh = os_realloc(*handlers, 127 (*num + 1) * sizeof(struct radius_rx_handler)); 128 if (newh == NULL) 129 return -1; 130 131 newh[*num].handler = handler; 132 newh[*num].data = data; 133 (*num)++; 134 *handlers = newh; 135 136 return 0; 137 } 138 139 140 static void radius_client_handle_send_error(struct radius_client_data *radius, 141 int s, RadiusType msg_type) 142 { 143 #ifndef CONFIG_NATIVE_WINDOWS 144 int _errno = errno; 145 perror("send[RADIUS]"); 146 if (_errno == ENOTCONN || _errno == EDESTADDRREQ || _errno == EINVAL || 147 _errno == EBADF) { 148 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS, 149 HOSTAPD_LEVEL_INFO, 150 "Send failed - maybe interface status changed -" 151 " try to connect again"); 152 eloop_unregister_read_sock(s); 153 close(s); 154 if (msg_type == RADIUS_ACCT || msg_type == RADIUS_ACCT_INTERIM) 155 radius_client_init_acct(radius); 156 else 157 radius_client_init_auth(radius); 158 } 159 #endif /* CONFIG_NATIVE_WINDOWS */ 160 } 161 162 163 static int radius_client_retransmit(struct radius_client_data *radius, 164 struct radius_msg_list *entry, 165 os_time_t now) 166 { 167 struct hostapd_radius_servers *conf = radius->conf; 168 int s; 169 170 if (entry->msg_type == RADIUS_ACCT || 171 entry->msg_type == RADIUS_ACCT_INTERIM) { 172 s = radius->acct_sock; 173 if (entry->attempts == 0) 174 conf->acct_server->requests++; 175 else { 176 conf->acct_server->timeouts++; 177 conf->acct_server->retransmissions++; 178 } 179 } else { 180 s = radius->auth_sock; 181 if (entry->attempts == 0) 182 conf->auth_server->requests++; 183 else { 184 conf->auth_server->timeouts++; 185 conf->auth_server->retransmissions++; 186 } 187 } 188 189 /* retransmit; remove entry if too many attempts */ 190 entry->attempts++; 191 hostapd_logger(radius->ctx, entry->addr, HOSTAPD_MODULE_RADIUS, 192 HOSTAPD_LEVEL_DEBUG, "Resending RADIUS message (id=%d)", 193 entry->msg->hdr->identifier); 194 195 os_get_time(&entry->last_attempt); 196 if (send(s, entry->msg->buf, entry->msg->buf_used, 0) < 0) 197 radius_client_handle_send_error(radius, s, entry->msg_type); 198 199 entry->next_try = now + entry->next_wait; 200 entry->next_wait *= 2; 201 if (entry->next_wait > RADIUS_CLIENT_MAX_WAIT) 202 entry->next_wait = RADIUS_CLIENT_MAX_WAIT; 203 if (entry->attempts >= RADIUS_CLIENT_MAX_RETRIES) { 204 printf("Removing un-ACKed RADIUS message due to too many " 205 "failed retransmit attempts\n"); 206 return 1; 207 } 208 209 return 0; 210 } 211 212 213 static void radius_client_timer(void *eloop_ctx, void *timeout_ctx) 214 { 215 struct radius_client_data *radius = eloop_ctx; 216 struct hostapd_radius_servers *conf = radius->conf; 217 struct os_time now; 218 os_time_t first; 219 struct radius_msg_list *entry, *prev, *tmp; 220 int auth_failover = 0, acct_failover = 0; 221 char abuf[50]; 222 223 entry = radius->msgs; 224 if (!entry) 225 return; 226 227 os_get_time(&now); 228 first = 0; 229 230 prev = NULL; 231 while (entry) { 232 if (now.sec >= entry->next_try && 233 radius_client_retransmit(radius, entry, now.sec)) { 234 if (prev) 235 prev->next = entry->next; 236 else 237 radius->msgs = entry->next; 238 239 tmp = entry; 240 entry = entry->next; 241 radius_client_msg_free(tmp); 242 radius->num_msgs--; 243 continue; 244 } 245 246 if (entry->attempts > RADIUS_CLIENT_NUM_FAILOVER) { 247 if (entry->msg_type == RADIUS_ACCT || 248 entry->msg_type == RADIUS_ACCT_INTERIM) 249 acct_failover++; 250 else 251 auth_failover++; 252 } 253 254 if (first == 0 || entry->next_try < first) 255 first = entry->next_try; 256 257 prev = entry; 258 entry = entry->next; 259 } 260 261 if (radius->msgs) { 262 if (first < now.sec) 263 first = now.sec; 264 eloop_register_timeout(first - now.sec, 0, 265 radius_client_timer, radius, NULL); 266 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS, 267 HOSTAPD_LEVEL_DEBUG, "Next RADIUS client " 268 "retransmit in %ld seconds", 269 (long int) (first - now.sec)); 270 } 271 272 if (auth_failover && conf->num_auth_servers > 1) { 273 struct hostapd_radius_server *next, *old; 274 old = conf->auth_server; 275 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS, 276 HOSTAPD_LEVEL_NOTICE, 277 "No response from Authentication server " 278 "%s:%d - failover", 279 hostapd_ip_txt(&old->addr, abuf, sizeof(abuf)), 280 old->port); 281 282 for (entry = radius->msgs; entry; entry = entry->next) { 283 if (entry->msg_type == RADIUS_AUTH) 284 old->timeouts++; 285 } 286 287 next = old + 1; 288 if (next > &(conf->auth_servers[conf->num_auth_servers - 1])) 289 next = conf->auth_servers; 290 conf->auth_server = next; 291 radius_change_server(radius, next, old, 292 radius->auth_serv_sock, 293 radius->auth_serv_sock6, 1); 294 } 295 296 if (acct_failover && conf->num_acct_servers > 1) { 297 struct hostapd_radius_server *next, *old; 298 old = conf->acct_server; 299 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS, 300 HOSTAPD_LEVEL_NOTICE, 301 "No response from Accounting server " 302 "%s:%d - failover", 303 hostapd_ip_txt(&old->addr, abuf, sizeof(abuf)), 304 old->port); 305 306 for (entry = radius->msgs; entry; entry = entry->next) { 307 if (entry->msg_type == RADIUS_ACCT || 308 entry->msg_type == RADIUS_ACCT_INTERIM) 309 old->timeouts++; 310 } 311 312 next = old + 1; 313 if (next > &conf->acct_servers[conf->num_acct_servers - 1]) 314 next = conf->acct_servers; 315 conf->acct_server = next; 316 radius_change_server(radius, next, old, 317 radius->acct_serv_sock, 318 radius->acct_serv_sock6, 0); 319 } 320 } 321 322 323 static void radius_client_update_timeout(struct radius_client_data *radius) 324 { 325 struct os_time now; 326 os_time_t first; 327 struct radius_msg_list *entry; 328 329 eloop_cancel_timeout(radius_client_timer, radius, NULL); 330 331 if (radius->msgs == NULL) { 332 return; 333 } 334 335 first = 0; 336 for (entry = radius->msgs; entry; entry = entry->next) { 337 if (first == 0 || entry->next_try < first) 338 first = entry->next_try; 339 } 340 341 os_get_time(&now); 342 if (first < now.sec) 343 first = now.sec; 344 eloop_register_timeout(first - now.sec, 0, radius_client_timer, radius, 345 NULL); 346 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS, 347 HOSTAPD_LEVEL_DEBUG, "Next RADIUS client retransmit in" 348 " %ld seconds\n", (long int) (first - now.sec)); 349 } 350 351 352 static void radius_client_list_add(struct radius_client_data *radius, 353 struct radius_msg *msg, 354 RadiusType msg_type, u8 *shared_secret, 355 size_t shared_secret_len, const u8 *addr) 356 { 357 struct radius_msg_list *entry, *prev; 358 359 if (eloop_terminated()) { 360 /* No point in adding entries to retransmit queue since event 361 * loop has already been terminated. */ 362 radius_msg_free(msg); 363 os_free(msg); 364 return; 365 } 366 367 entry = os_zalloc(sizeof(*entry)); 368 if (entry == NULL) { 369 printf("Failed to add RADIUS packet into retransmit list\n"); 370 radius_msg_free(msg); 371 os_free(msg); 372 return; 373 } 374 375 if (addr) 376 os_memcpy(entry->addr, addr, ETH_ALEN); 377 entry->msg = msg; 378 entry->msg_type = msg_type; 379 entry->shared_secret = shared_secret; 380 entry->shared_secret_len = shared_secret_len; 381 os_get_time(&entry->last_attempt); 382 entry->first_try = entry->last_attempt.sec; 383 entry->next_try = entry->first_try + RADIUS_CLIENT_FIRST_WAIT; 384 entry->attempts = 1; 385 entry->next_wait = RADIUS_CLIENT_FIRST_WAIT * 2; 386 entry->next = radius->msgs; 387 radius->msgs = entry; 388 radius_client_update_timeout(radius); 389 390 if (radius->num_msgs >= RADIUS_CLIENT_MAX_ENTRIES) { 391 printf("Removing the oldest un-ACKed RADIUS packet due to " 392 "retransmit list limits.\n"); 393 prev = NULL; 394 while (entry->next) { 395 prev = entry; 396 entry = entry->next; 397 } 398 if (prev) { 399 prev->next = NULL; 400 radius_client_msg_free(entry); 401 } 402 } else 403 radius->num_msgs++; 404 } 405 406 407 static void radius_client_list_del(struct radius_client_data *radius, 408 RadiusType msg_type, const u8 *addr) 409 { 410 struct radius_msg_list *entry, *prev, *tmp; 411 412 if (addr == NULL) 413 return; 414 415 entry = radius->msgs; 416 prev = NULL; 417 while (entry) { 418 if (entry->msg_type == msg_type && 419 os_memcmp(entry->addr, addr, ETH_ALEN) == 0) { 420 if (prev) 421 prev->next = entry->next; 422 else 423 radius->msgs = entry->next; 424 tmp = entry; 425 entry = entry->next; 426 hostapd_logger(radius->ctx, addr, 427 HOSTAPD_MODULE_RADIUS, 428 HOSTAPD_LEVEL_DEBUG, 429 "Removing matching RADIUS message"); 430 radius_client_msg_free(tmp); 431 radius->num_msgs--; 432 continue; 433 } 434 prev = entry; 435 entry = entry->next; 436 } 437 } 438 439 440 int radius_client_send(struct radius_client_data *radius, 441 struct radius_msg *msg, RadiusType msg_type, 442 const u8 *addr) 443 { 444 struct hostapd_radius_servers *conf = radius->conf; 445 u8 *shared_secret; 446 size_t shared_secret_len; 447 char *name; 448 int s, res; 449 450 if (msg_type == RADIUS_ACCT_INTERIM) { 451 /* Remove any pending interim acct update for the same STA. */ 452 radius_client_list_del(radius, msg_type, addr); 453 } 454 455 if (msg_type == RADIUS_ACCT || msg_type == RADIUS_ACCT_INTERIM) { 456 if (conf->acct_server == NULL) { 457 hostapd_logger(radius->ctx, NULL, 458 HOSTAPD_MODULE_RADIUS, 459 HOSTAPD_LEVEL_INFO, 460 "No accounting server configured"); 461 return -1; 462 } 463 shared_secret = conf->acct_server->shared_secret; 464 shared_secret_len = conf->acct_server->shared_secret_len; 465 radius_msg_finish_acct(msg, shared_secret, shared_secret_len); 466 name = "accounting"; 467 s = radius->acct_sock; 468 conf->acct_server->requests++; 469 } else { 470 if (conf->auth_server == NULL) { 471 hostapd_logger(radius->ctx, NULL, 472 HOSTAPD_MODULE_RADIUS, 473 HOSTAPD_LEVEL_INFO, 474 "No authentication server configured"); 475 return -1; 476 } 477 shared_secret = conf->auth_server->shared_secret; 478 shared_secret_len = conf->auth_server->shared_secret_len; 479 radius_msg_finish(msg, shared_secret, shared_secret_len); 480 name = "authentication"; 481 s = radius->auth_sock; 482 conf->auth_server->requests++; 483 } 484 485 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS, 486 HOSTAPD_LEVEL_DEBUG, "Sending RADIUS message to %s " 487 "server", name); 488 if (conf->msg_dumps) 489 radius_msg_dump(msg); 490 491 res = send(s, msg->buf, msg->buf_used, 0); 492 if (res < 0) 493 radius_client_handle_send_error(radius, s, msg_type); 494 495 radius_client_list_add(radius, msg, msg_type, shared_secret, 496 shared_secret_len, addr); 497 498 return res; 499 } 500 501 502 static void radius_client_receive(int sock, void *eloop_ctx, void *sock_ctx) 503 { 504 struct radius_client_data *radius = eloop_ctx; 505 struct hostapd_radius_servers *conf = radius->conf; 506 RadiusType msg_type = (RadiusType) sock_ctx; 507 int len, roundtrip; 508 unsigned char buf[3000]; 509 struct radius_msg *msg; 510 struct radius_rx_handler *handlers; 511 size_t num_handlers, i; 512 struct radius_msg_list *req, *prev_req; 513 struct os_time now; 514 struct hostapd_radius_server *rconf; 515 int invalid_authenticator = 0; 516 517 if (msg_type == RADIUS_ACCT) { 518 handlers = radius->acct_handlers; 519 num_handlers = radius->num_acct_handlers; 520 rconf = conf->acct_server; 521 } else { 522 handlers = radius->auth_handlers; 523 num_handlers = radius->num_auth_handlers; 524 rconf = conf->auth_server; 525 } 526 527 len = recv(sock, buf, sizeof(buf), MSG_DONTWAIT); 528 if (len < 0) { 529 perror("recv[RADIUS]"); 530 return; 531 } 532 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS, 533 HOSTAPD_LEVEL_DEBUG, "Received %d bytes from RADIUS " 534 "server", len); 535 if (len == sizeof(buf)) { 536 printf("Possibly too long UDP frame for our buffer - " 537 "dropping it\n"); 538 return; 539 } 540 541 msg = radius_msg_parse(buf, len); 542 if (msg == NULL) { 543 printf("Parsing incoming RADIUS frame failed\n"); 544 rconf->malformed_responses++; 545 return; 546 } 547 548 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS, 549 HOSTAPD_LEVEL_DEBUG, "Received RADIUS message"); 550 if (conf->msg_dumps) 551 radius_msg_dump(msg); 552 553 switch (msg->hdr->code) { 554 case RADIUS_CODE_ACCESS_ACCEPT: 555 rconf->access_accepts++; 556 break; 557 case RADIUS_CODE_ACCESS_REJECT: 558 rconf->access_rejects++; 559 break; 560 case RADIUS_CODE_ACCESS_CHALLENGE: 561 rconf->access_challenges++; 562 break; 563 case RADIUS_CODE_ACCOUNTING_RESPONSE: 564 rconf->responses++; 565 break; 566 } 567 568 prev_req = NULL; 569 req = radius->msgs; 570 while (req) { 571 /* TODO: also match by src addr:port of the packet when using 572 * alternative RADIUS servers (?) */ 573 if ((req->msg_type == msg_type || 574 (req->msg_type == RADIUS_ACCT_INTERIM && 575 msg_type == RADIUS_ACCT)) && 576 req->msg->hdr->identifier == msg->hdr->identifier) 577 break; 578 579 prev_req = req; 580 req = req->next; 581 } 582 583 if (req == NULL) { 584 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS, 585 HOSTAPD_LEVEL_DEBUG, 586 "No matching RADIUS request found (type=%d " 587 "id=%d) - dropping packet", 588 msg_type, msg->hdr->identifier); 589 goto fail; 590 } 591 592 os_get_time(&now); 593 roundtrip = (now.sec - req->last_attempt.sec) * 100 + 594 (now.usec - req->last_attempt.usec) / 10000; 595 hostapd_logger(radius->ctx, req->addr, HOSTAPD_MODULE_RADIUS, 596 HOSTAPD_LEVEL_DEBUG, 597 "Received RADIUS packet matched with a pending " 598 "request, round trip time %d.%02d sec", 599 roundtrip / 100, roundtrip % 100); 600 rconf->round_trip_time = roundtrip; 601 602 /* Remove ACKed RADIUS packet from retransmit list */ 603 if (prev_req) 604 prev_req->next = req->next; 605 else 606 radius->msgs = req->next; 607 radius->num_msgs--; 608 609 for (i = 0; i < num_handlers; i++) { 610 RadiusRxResult res; 611 res = handlers[i].handler(msg, req->msg, req->shared_secret, 612 req->shared_secret_len, 613 handlers[i].data); 614 switch (res) { 615 case RADIUS_RX_PROCESSED: 616 radius_msg_free(msg); 617 os_free(msg); 618 /* continue */ 619 case RADIUS_RX_QUEUED: 620 radius_client_msg_free(req); 621 return; 622 case RADIUS_RX_INVALID_AUTHENTICATOR: 623 invalid_authenticator++; 624 /* continue */ 625 case RADIUS_RX_UNKNOWN: 626 /* continue with next handler */ 627 break; 628 } 629 } 630 631 if (invalid_authenticator) 632 rconf->bad_authenticators++; 633 else 634 rconf->unknown_types++; 635 hostapd_logger(radius->ctx, req->addr, HOSTAPD_MODULE_RADIUS, 636 HOSTAPD_LEVEL_DEBUG, "No RADIUS RX handler found " 637 "(type=%d code=%d id=%d)%s - dropping packet", 638 msg_type, msg->hdr->code, msg->hdr->identifier, 639 invalid_authenticator ? " [INVALID AUTHENTICATOR]" : 640 ""); 641 radius_client_msg_free(req); 642 643 fail: 644 radius_msg_free(msg); 645 os_free(msg); 646 } 647 648 649 u8 radius_client_get_id(struct radius_client_data *radius) 650 { 651 struct radius_msg_list *entry, *prev, *_remove; 652 u8 id = radius->next_radius_identifier++; 653 654 /* remove entries with matching id from retransmit list to avoid 655 * using new reply from the RADIUS server with an old request */ 656 entry = radius->msgs; 657 prev = NULL; 658 while (entry) { 659 if (entry->msg->hdr->identifier == id) { 660 hostapd_logger(radius->ctx, entry->addr, 661 HOSTAPD_MODULE_RADIUS, 662 HOSTAPD_LEVEL_DEBUG, 663 "Removing pending RADIUS message, " 664 "since its id (%d) is reused", id); 665 if (prev) 666 prev->next = entry->next; 667 else 668 radius->msgs = entry->next; 669 _remove = entry; 670 } else { 671 _remove = NULL; 672 prev = entry; 673 } 674 entry = entry->next; 675 676 if (_remove) 677 radius_client_msg_free(_remove); 678 } 679 680 return id; 681 } 682 683 684 void radius_client_flush(struct radius_client_data *radius, int only_auth) 685 { 686 struct radius_msg_list *entry, *prev, *tmp; 687 688 if (!radius) 689 return; 690 691 prev = NULL; 692 entry = radius->msgs; 693 694 while (entry) { 695 if (!only_auth || entry->msg_type == RADIUS_AUTH) { 696 if (prev) 697 prev->next = entry->next; 698 else 699 radius->msgs = entry->next; 700 701 tmp = entry; 702 entry = entry->next; 703 radius_client_msg_free(tmp); 704 radius->num_msgs--; 705 } else { 706 prev = entry; 707 entry = entry->next; 708 } 709 } 710 711 if (radius->msgs == NULL) 712 eloop_cancel_timeout(radius_client_timer, radius, NULL); 713 } 714 715 716 static void radius_client_update_acct_msgs(struct radius_client_data *radius, 717 u8 *shared_secret, 718 size_t shared_secret_len) 719 { 720 struct radius_msg_list *entry; 721 722 if (!radius) 723 return; 724 725 for (entry = radius->msgs; entry; entry = entry->next) { 726 if (entry->msg_type == RADIUS_ACCT) { 727 entry->shared_secret = shared_secret; 728 entry->shared_secret_len = shared_secret_len; 729 radius_msg_finish_acct(entry->msg, shared_secret, 730 shared_secret_len); 731 } 732 } 733 } 734 735 736 static int 737 radius_change_server(struct radius_client_data *radius, 738 struct hostapd_radius_server *nserv, 739 struct hostapd_radius_server *oserv, 740 int sock, int sock6, int auth) 741 { 742 struct sockaddr_in serv, claddr; 743 #ifdef CONFIG_IPV6 744 struct sockaddr_in6 serv6, claddr6; 745 #endif /* CONFIG_IPV6 */ 746 struct sockaddr *addr, *cl_addr; 747 socklen_t addrlen, claddrlen; 748 char abuf[50]; 749 int sel_sock; 750 struct radius_msg_list *entry; 751 struct hostapd_radius_servers *conf = radius->conf; 752 753 hostapd_logger(radius->ctx, NULL, HOSTAPD_MODULE_RADIUS, 754 HOSTAPD_LEVEL_INFO, 755 "%s server %s:%d", 756 auth ? "Authentication" : "Accounting", 757 hostapd_ip_txt(&nserv->addr, abuf, sizeof(abuf)), 758 nserv->port); 759 760 if (!oserv || nserv->shared_secret_len != oserv->shared_secret_len || 761 os_memcmp(nserv->shared_secret, oserv->shared_secret, 762 nserv->shared_secret_len) != 0) { 763 /* Pending RADIUS packets used different shared secret, so 764 * they need to be modified. Update accounting message 765 * authenticators here. Authentication messages are removed 766 * since they would require more changes and the new RADIUS 767 * server may not be prepared to receive them anyway due to 768 * missing state information. Client will likely retry 769 * authentication, so this should not be an issue. */ 770 if (auth) 771 radius_client_flush(radius, 1); 772 else { 773 radius_client_update_acct_msgs( 774 radius, nserv->shared_secret, 775 nserv->shared_secret_len); 776 } 777 } 778 779 /* Reset retry counters for the new server */ 780 for (entry = radius->msgs; entry; entry = entry->next) { 781 if ((auth && entry->msg_type != RADIUS_AUTH) || 782 (!auth && entry->msg_type != RADIUS_ACCT)) 783 continue; 784 entry->next_try = entry->first_try + RADIUS_CLIENT_FIRST_WAIT; 785 entry->attempts = 0; 786 entry->next_wait = RADIUS_CLIENT_FIRST_WAIT * 2; 787 } 788 789 if (radius->msgs) { 790 eloop_cancel_timeout(radius_client_timer, radius, NULL); 791 eloop_register_timeout(RADIUS_CLIENT_FIRST_WAIT, 0, 792 radius_client_timer, radius, NULL); 793 } 794 795 switch (nserv->addr.af) { 796 case AF_INET: 797 os_memset(&serv, 0, sizeof(serv)); 798 serv.sin_family = AF_INET; 799 serv.sin_addr.s_addr = nserv->addr.u.v4.s_addr; 800 serv.sin_port = htons(nserv->port); 801 addr = (struct sockaddr *) &serv; 802 addrlen = sizeof(serv); 803 sel_sock = sock; 804 break; 805 #ifdef CONFIG_IPV6 806 case AF_INET6: 807 os_memset(&serv6, 0, sizeof(serv6)); 808 serv6.sin6_family = AF_INET6; 809 os_memcpy(&serv6.sin6_addr, &nserv->addr.u.v6, 810 sizeof(struct in6_addr)); 811 serv6.sin6_port = htons(nserv->port); 812 addr = (struct sockaddr *) &serv6; 813 addrlen = sizeof(serv6); 814 sel_sock = sock6; 815 break; 816 #endif /* CONFIG_IPV6 */ 817 default: 818 return -1; 819 } 820 821 if (conf->force_client_addr) { 822 switch (conf->client_addr.af) { 823 case AF_INET: 824 os_memset(&claddr, 0, sizeof(claddr)); 825 claddr.sin_family = AF_INET; 826 claddr.sin_addr.s_addr = conf->client_addr.u.v4.s_addr; 827 claddr.sin_port = htons(0); 828 cl_addr = (struct sockaddr *) &claddr; 829 claddrlen = sizeof(claddr); 830 break; 831 #ifdef CONFIG_IPV6 832 case AF_INET6: 833 os_memset(&claddr6, 0, sizeof(claddr6)); 834 claddr6.sin6_family = AF_INET6; 835 os_memcpy(&claddr6.sin6_addr, &conf->client_addr.u.v6, 836 sizeof(struct in6_addr)); 837 claddr6.sin6_port = htons(0); 838 cl_addr = (struct sockaddr *) &claddr6; 839 claddrlen = sizeof(claddr6); 840 break; 841 #endif /* CONFIG_IPV6 */ 842 default: 843 return -1; 844 } 845 846 if (bind(sel_sock, cl_addr, claddrlen) < 0) { 847 perror("bind[radius]"); 848 return -1; 849 } 850 } 851 852 if (connect(sel_sock, addr, addrlen) < 0) { 853 perror("connect[radius]"); 854 return -1; 855 } 856 857 #ifndef CONFIG_NATIVE_WINDOWS 858 switch (nserv->addr.af) { 859 case AF_INET: 860 claddrlen = sizeof(claddr); 861 getsockname(sel_sock, (struct sockaddr *) &claddr, &claddrlen); 862 wpa_printf(MSG_DEBUG, "RADIUS local address: %s:%u", 863 inet_ntoa(claddr.sin_addr), ntohs(claddr.sin_port)); 864 break; 865 #ifdef CONFIG_IPV6 866 case AF_INET6: { 867 claddrlen = sizeof(claddr6); 868 getsockname(sel_sock, (struct sockaddr *) &claddr6, 869 &claddrlen); 870 wpa_printf(MSG_DEBUG, "RADIUS local address: %s:%u", 871 inet_ntop(AF_INET6, &claddr6.sin6_addr, 872 abuf, sizeof(abuf)), 873 ntohs(claddr6.sin6_port)); 874 break; 875 } 876 #endif /* CONFIG_IPV6 */ 877 } 878 #endif /* CONFIG_NATIVE_WINDOWS */ 879 880 if (auth) 881 radius->auth_sock = sel_sock; 882 else 883 radius->acct_sock = sel_sock; 884 885 return 0; 886 } 887 888 889 static void radius_retry_primary_timer(void *eloop_ctx, void *timeout_ctx) 890 { 891 struct radius_client_data *radius = eloop_ctx; 892 struct hostapd_radius_servers *conf = radius->conf; 893 struct hostapd_radius_server *oserv; 894 895 if (radius->auth_sock >= 0 && conf->auth_servers && 896 conf->auth_server != conf->auth_servers) { 897 oserv = conf->auth_server; 898 conf->auth_server = conf->auth_servers; 899 radius_change_server(radius, conf->auth_server, oserv, 900 radius->auth_serv_sock, 901 radius->auth_serv_sock6, 1); 902 } 903 904 if (radius->acct_sock >= 0 && conf->acct_servers && 905 conf->acct_server != conf->acct_servers) { 906 oserv = conf->acct_server; 907 conf->acct_server = conf->acct_servers; 908 radius_change_server(radius, conf->acct_server, oserv, 909 radius->acct_serv_sock, 910 radius->acct_serv_sock6, 0); 911 } 912 913 if (conf->retry_primary_interval) 914 eloop_register_timeout(conf->retry_primary_interval, 0, 915 radius_retry_primary_timer, radius, 916 NULL); 917 } 918 919 920 static int radius_client_disable_pmtu_discovery(int s) 921 { 922 int r = -1; 923 #if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT) 924 /* Turn off Path MTU discovery on IPv4/UDP sockets. */ 925 int action = IP_PMTUDISC_DONT; 926 r = setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER, &action, 927 sizeof(action)); 928 if (r == -1) 929 wpa_printf(MSG_ERROR, "Failed to set IP_MTU_DISCOVER: " 930 "%s", strerror(errno)); 931 #endif 932 return r; 933 } 934 935 936 static int radius_client_init_auth(struct radius_client_data *radius) 937 { 938 struct hostapd_radius_servers *conf = radius->conf; 939 int ok = 0; 940 941 radius->auth_serv_sock = socket(PF_INET, SOCK_DGRAM, 0); 942 if (radius->auth_serv_sock < 0) 943 perror("socket[PF_INET,SOCK_DGRAM]"); 944 else { 945 radius_client_disable_pmtu_discovery(radius->auth_serv_sock); 946 ok++; 947 } 948 949 #ifdef CONFIG_IPV6 950 radius->auth_serv_sock6 = socket(PF_INET6, SOCK_DGRAM, 0); 951 if (radius->auth_serv_sock6 < 0) 952 perror("socket[PF_INET6,SOCK_DGRAM]"); 953 else 954 ok++; 955 #endif /* CONFIG_IPV6 */ 956 957 if (ok == 0) 958 return -1; 959 960 radius_change_server(radius, conf->auth_server, NULL, 961 radius->auth_serv_sock, radius->auth_serv_sock6, 962 1); 963 964 if (radius->auth_serv_sock >= 0 && 965 eloop_register_read_sock(radius->auth_serv_sock, 966 radius_client_receive, radius, 967 (void *) RADIUS_AUTH)) { 968 printf("Could not register read socket for authentication " 969 "server\n"); 970 return -1; 971 } 972 973 #ifdef CONFIG_IPV6 974 if (radius->auth_serv_sock6 >= 0 && 975 eloop_register_read_sock(radius->auth_serv_sock6, 976 radius_client_receive, radius, 977 (void *) RADIUS_AUTH)) { 978 printf("Could not register read socket for authentication " 979 "server\n"); 980 return -1; 981 } 982 #endif /* CONFIG_IPV6 */ 983 984 return 0; 985 } 986 987 988 static int radius_client_init_acct(struct radius_client_data *radius) 989 { 990 struct hostapd_radius_servers *conf = radius->conf; 991 int ok = 0; 992 993 radius->acct_serv_sock = socket(PF_INET, SOCK_DGRAM, 0); 994 if (radius->acct_serv_sock < 0) 995 perror("socket[PF_INET,SOCK_DGRAM]"); 996 else { 997 radius_client_disable_pmtu_discovery(radius->acct_serv_sock); 998 ok++; 999 } 1000 1001 #ifdef CONFIG_IPV6 1002 radius->acct_serv_sock6 = socket(PF_INET6, SOCK_DGRAM, 0); 1003 if (radius->acct_serv_sock6 < 0) 1004 perror("socket[PF_INET6,SOCK_DGRAM]"); 1005 else 1006 ok++; 1007 #endif /* CONFIG_IPV6 */ 1008 1009 if (ok == 0) 1010 return -1; 1011 1012 radius_change_server(radius, conf->acct_server, NULL, 1013 radius->acct_serv_sock, radius->acct_serv_sock6, 1014 0); 1015 1016 if (radius->acct_serv_sock >= 0 && 1017 eloop_register_read_sock(radius->acct_serv_sock, 1018 radius_client_receive, radius, 1019 (void *) RADIUS_ACCT)) { 1020 printf("Could not register read socket for accounting " 1021 "server\n"); 1022 return -1; 1023 } 1024 1025 #ifdef CONFIG_IPV6 1026 if (radius->acct_serv_sock6 >= 0 && 1027 eloop_register_read_sock(radius->acct_serv_sock6, 1028 radius_client_receive, radius, 1029 (void *) RADIUS_ACCT)) { 1030 printf("Could not register read socket for accounting " 1031 "server\n"); 1032 return -1; 1033 } 1034 #endif /* CONFIG_IPV6 */ 1035 1036 return 0; 1037 } 1038 1039 1040 struct radius_client_data * 1041 radius_client_init(void *ctx, struct hostapd_radius_servers *conf) 1042 { 1043 struct radius_client_data *radius; 1044 1045 radius = os_zalloc(sizeof(struct radius_client_data)); 1046 if (radius == NULL) 1047 return NULL; 1048 1049 radius->ctx = ctx; 1050 radius->conf = conf; 1051 radius->auth_serv_sock = radius->acct_serv_sock = 1052 radius->auth_serv_sock6 = radius->acct_serv_sock6 = 1053 radius->auth_sock = radius->acct_sock = -1; 1054 1055 if (conf->auth_server && radius_client_init_auth(radius)) { 1056 radius_client_deinit(radius); 1057 return NULL; 1058 } 1059 1060 if (conf->acct_server && radius_client_init_acct(radius)) { 1061 radius_client_deinit(radius); 1062 return NULL; 1063 } 1064 1065 if (conf->retry_primary_interval) 1066 eloop_register_timeout(conf->retry_primary_interval, 0, 1067 radius_retry_primary_timer, radius, 1068 NULL); 1069 1070 return radius; 1071 } 1072 1073 1074 void radius_client_deinit(struct radius_client_data *radius) 1075 { 1076 if (!radius) 1077 return; 1078 1079 if (radius->auth_serv_sock >= 0) 1080 eloop_unregister_read_sock(radius->auth_serv_sock); 1081 if (radius->acct_serv_sock >= 0) 1082 eloop_unregister_read_sock(radius->acct_serv_sock); 1083 #ifdef CONFIG_IPV6 1084 if (radius->auth_serv_sock6 >= 0) 1085 eloop_unregister_read_sock(radius->auth_serv_sock6); 1086 if (radius->acct_serv_sock6 >= 0) 1087 eloop_unregister_read_sock(radius->acct_serv_sock6); 1088 #endif /* CONFIG_IPV6 */ 1089 1090 eloop_cancel_timeout(radius_retry_primary_timer, radius, NULL); 1091 1092 radius_client_flush(radius, 0); 1093 os_free(radius->auth_handlers); 1094 os_free(radius->acct_handlers); 1095 os_free(radius); 1096 } 1097 1098 1099 void radius_client_flush_auth(struct radius_client_data *radius, u8 *addr) 1100 { 1101 struct radius_msg_list *entry, *prev, *tmp; 1102 1103 prev = NULL; 1104 entry = radius->msgs; 1105 while (entry) { 1106 if (entry->msg_type == RADIUS_AUTH && 1107 os_memcmp(entry->addr, addr, ETH_ALEN) == 0) { 1108 hostapd_logger(radius->ctx, addr, 1109 HOSTAPD_MODULE_RADIUS, 1110 HOSTAPD_LEVEL_DEBUG, 1111 "Removing pending RADIUS authentication" 1112 " message for removed client"); 1113 1114 if (prev) 1115 prev->next = entry->next; 1116 else 1117 radius->msgs = entry->next; 1118 1119 tmp = entry; 1120 entry = entry->next; 1121 radius_client_msg_free(tmp); 1122 radius->num_msgs--; 1123 continue; 1124 } 1125 1126 prev = entry; 1127 entry = entry->next; 1128 } 1129 } 1130 1131 1132 static int radius_client_dump_auth_server(char *buf, size_t buflen, 1133 struct hostapd_radius_server *serv, 1134 struct radius_client_data *cli) 1135 { 1136 int pending = 0; 1137 struct radius_msg_list *msg; 1138 char abuf[50]; 1139 1140 if (cli) { 1141 for (msg = cli->msgs; msg; msg = msg->next) { 1142 if (msg->msg_type == RADIUS_AUTH) 1143 pending++; 1144 } 1145 } 1146 1147 return os_snprintf(buf, buflen, 1148 "radiusAuthServerIndex=%d\n" 1149 "radiusAuthServerAddress=%s\n" 1150 "radiusAuthClientServerPortNumber=%d\n" 1151 "radiusAuthClientRoundTripTime=%d\n" 1152 "radiusAuthClientAccessRequests=%u\n" 1153 "radiusAuthClientAccessRetransmissions=%u\n" 1154 "radiusAuthClientAccessAccepts=%u\n" 1155 "radiusAuthClientAccessRejects=%u\n" 1156 "radiusAuthClientAccessChallenges=%u\n" 1157 "radiusAuthClientMalformedAccessResponses=%u\n" 1158 "radiusAuthClientBadAuthenticators=%u\n" 1159 "radiusAuthClientPendingRequests=%u\n" 1160 "radiusAuthClientTimeouts=%u\n" 1161 "radiusAuthClientUnknownTypes=%u\n" 1162 "radiusAuthClientPacketsDropped=%u\n", 1163 serv->index, 1164 hostapd_ip_txt(&serv->addr, abuf, sizeof(abuf)), 1165 serv->port, 1166 serv->round_trip_time, 1167 serv->requests, 1168 serv->retransmissions, 1169 serv->access_accepts, 1170 serv->access_rejects, 1171 serv->access_challenges, 1172 serv->malformed_responses, 1173 serv->bad_authenticators, 1174 pending, 1175 serv->timeouts, 1176 serv->unknown_types, 1177 serv->packets_dropped); 1178 } 1179 1180 1181 static int radius_client_dump_acct_server(char *buf, size_t buflen, 1182 struct hostapd_radius_server *serv, 1183 struct radius_client_data *cli) 1184 { 1185 int pending = 0; 1186 struct radius_msg_list *msg; 1187 char abuf[50]; 1188 1189 if (cli) { 1190 for (msg = cli->msgs; msg; msg = msg->next) { 1191 if (msg->msg_type == RADIUS_ACCT || 1192 msg->msg_type == RADIUS_ACCT_INTERIM) 1193 pending++; 1194 } 1195 } 1196 1197 return os_snprintf(buf, buflen, 1198 "radiusAccServerIndex=%d\n" 1199 "radiusAccServerAddress=%s\n" 1200 "radiusAccClientServerPortNumber=%d\n" 1201 "radiusAccClientRoundTripTime=%d\n" 1202 "radiusAccClientRequests=%u\n" 1203 "radiusAccClientRetransmissions=%u\n" 1204 "radiusAccClientResponses=%u\n" 1205 "radiusAccClientMalformedResponses=%u\n" 1206 "radiusAccClientBadAuthenticators=%u\n" 1207 "radiusAccClientPendingRequests=%u\n" 1208 "radiusAccClientTimeouts=%u\n" 1209 "radiusAccClientUnknownTypes=%u\n" 1210 "radiusAccClientPacketsDropped=%u\n", 1211 serv->index, 1212 hostapd_ip_txt(&serv->addr, abuf, sizeof(abuf)), 1213 serv->port, 1214 serv->round_trip_time, 1215 serv->requests, 1216 serv->retransmissions, 1217 serv->responses, 1218 serv->malformed_responses, 1219 serv->bad_authenticators, 1220 pending, 1221 serv->timeouts, 1222 serv->unknown_types, 1223 serv->packets_dropped); 1224 } 1225 1226 1227 int radius_client_get_mib(struct radius_client_data *radius, char *buf, 1228 size_t buflen) 1229 { 1230 struct hostapd_radius_servers *conf = radius->conf; 1231 int i; 1232 struct hostapd_radius_server *serv; 1233 int count = 0; 1234 1235 if (conf->auth_servers) { 1236 for (i = 0; i < conf->num_auth_servers; i++) { 1237 serv = &conf->auth_servers[i]; 1238 count += radius_client_dump_auth_server( 1239 buf + count, buflen - count, serv, 1240 serv == conf->auth_server ? 1241 radius : NULL); 1242 } 1243 } 1244 1245 if (conf->acct_servers) { 1246 for (i = 0; i < conf->num_acct_servers; i++) { 1247 serv = &conf->acct_servers[i]; 1248 count += radius_client_dump_acct_server( 1249 buf + count, buflen - count, serv, 1250 serv == conf->acct_server ? 1251 radius : NULL); 1252 } 1253 } 1254 1255 return count; 1256 } 1257 1258 1259 static int radius_servers_diff(struct hostapd_radius_server *nserv, 1260 struct hostapd_radius_server *oserv, 1261 int num) 1262 { 1263 int i; 1264 1265 for (i = 0; i < num; i++) { 1266 if (hostapd_ip_diff(&nserv[i].addr, &oserv[i].addr) || 1267 nserv[i].port != oserv[i].port || 1268 nserv[i].shared_secret_len != oserv[i].shared_secret_len || 1269 os_memcmp(nserv[i].shared_secret, oserv[i].shared_secret, 1270 nserv[i].shared_secret_len) != 0) 1271 return 1; 1272 } 1273 1274 return 0; 1275 } 1276 1277 1278 struct radius_client_data * 1279 radius_client_reconfig(struct radius_client_data *old, void *ctx, 1280 struct hostapd_radius_servers *oldconf, 1281 struct hostapd_radius_servers *newconf) 1282 { 1283 radius_client_flush(old, 0); 1284 1285 if (newconf->retry_primary_interval != 1286 oldconf->retry_primary_interval || 1287 newconf->num_auth_servers != oldconf->num_auth_servers || 1288 newconf->num_acct_servers != oldconf->num_acct_servers || 1289 radius_servers_diff(newconf->auth_servers, oldconf->auth_servers, 1290 newconf->num_auth_servers) || 1291 radius_servers_diff(newconf->acct_servers, oldconf->acct_servers, 1292 newconf->num_acct_servers)) { 1293 hostapd_logger(ctx, NULL, HOSTAPD_MODULE_RADIUS, 1294 HOSTAPD_LEVEL_DEBUG, 1295 "Reconfiguring RADIUS client"); 1296 radius_client_deinit(old); 1297 return radius_client_init(ctx, newconf); 1298 } 1299 1300 return old; 1301 } 1302