1 /* 2 * hostapd / RADIUS authentication server 3 * Copyright (c) 2005-2008, Jouni Malinen <j (at) 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 #include <net/if.h> 17 18 #include "common.h" 19 #include "radius.h" 20 #include "eloop.h" 21 #include "defs.h" 22 #include "eap_server/eap.h" 23 #include "radius_server.h" 24 25 #define RADIUS_SESSION_TIMEOUT 60 26 #define RADIUS_MAX_SESSION 100 27 #define RADIUS_MAX_MSG_LEN 3000 28 29 static struct eapol_callbacks radius_server_eapol_cb; 30 31 struct radius_client; 32 struct radius_server_data; 33 34 struct radius_server_counters { 35 u32 access_requests; 36 u32 invalid_requests; 37 u32 dup_access_requests; 38 u32 access_accepts; 39 u32 access_rejects; 40 u32 access_challenges; 41 u32 malformed_access_requests; 42 u32 bad_authenticators; 43 u32 packets_dropped; 44 u32 unknown_types; 45 }; 46 47 struct radius_session { 48 struct radius_session *next; 49 struct radius_client *client; 50 struct radius_server_data *server; 51 unsigned int sess_id; 52 struct eap_sm *eap; 53 struct eap_eapol_interface *eap_if; 54 55 struct radius_msg *last_msg; 56 char *last_from_addr; 57 int last_from_port; 58 struct sockaddr_storage last_from; 59 socklen_t last_fromlen; 60 u8 last_identifier; 61 struct radius_msg *last_reply; 62 u8 last_authenticator[16]; 63 }; 64 65 struct radius_client { 66 struct radius_client *next; 67 struct in_addr addr; 68 struct in_addr mask; 69 #ifdef CONFIG_IPV6 70 struct in6_addr addr6; 71 struct in6_addr mask6; 72 #endif /* CONFIG_IPV6 */ 73 char *shared_secret; 74 int shared_secret_len; 75 struct radius_session *sessions; 76 struct radius_server_counters counters; 77 }; 78 79 struct radius_server_data { 80 int auth_sock; 81 struct radius_client *clients; 82 unsigned int next_sess_id; 83 void *conf_ctx; 84 int num_sess; 85 void *eap_sim_db_priv; 86 void *ssl_ctx; 87 u8 *pac_opaque_encr_key; 88 u8 *eap_fast_a_id; 89 size_t eap_fast_a_id_len; 90 char *eap_fast_a_id_info; 91 int eap_fast_prov; 92 int pac_key_lifetime; 93 int pac_key_refresh_time; 94 int eap_sim_aka_result_ind; 95 int tnc; 96 struct wps_context *wps; 97 int ipv6; 98 struct os_time start_time; 99 struct radius_server_counters counters; 100 int (*get_eap_user)(void *ctx, const u8 *identity, size_t identity_len, 101 int phase2, struct eap_user *user); 102 char *eap_req_id_text; 103 size_t eap_req_id_text_len; 104 }; 105 106 107 extern int wpa_debug_level; 108 109 #define RADIUS_DEBUG(args...) \ 110 wpa_printf(MSG_DEBUG, "RADIUS SRV: " args) 111 #define RADIUS_ERROR(args...) \ 112 wpa_printf(MSG_ERROR, "RADIUS SRV: " args) 113 #define RADIUS_DUMP(args...) \ 114 wpa_hexdump(MSG_MSGDUMP, "RADIUS SRV: " args) 115 #define RADIUS_DUMP_ASCII(args...) \ 116 wpa_hexdump_ascii(MSG_MSGDUMP, "RADIUS SRV: " args) 117 118 119 static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx); 120 static void radius_server_session_remove_timeout(void *eloop_ctx, 121 void *timeout_ctx); 122 123 124 static struct radius_client * 125 radius_server_get_client(struct radius_server_data *data, struct in_addr *addr, 126 int ipv6) 127 { 128 struct radius_client *client = data->clients; 129 130 while (client) { 131 #ifdef CONFIG_IPV6 132 if (ipv6) { 133 struct in6_addr *addr6; 134 int i; 135 136 addr6 = (struct in6_addr *) addr; 137 for (i = 0; i < 16; i++) { 138 if ((addr6->s6_addr[i] & 139 client->mask6.s6_addr[i]) != 140 (client->addr6.s6_addr[i] & 141 client->mask6.s6_addr[i])) { 142 i = 17; 143 break; 144 } 145 } 146 if (i == 16) { 147 break; 148 } 149 } 150 #endif /* CONFIG_IPV6 */ 151 if (!ipv6 && (client->addr.s_addr & client->mask.s_addr) == 152 (addr->s_addr & client->mask.s_addr)) { 153 break; 154 } 155 156 client = client->next; 157 } 158 159 return client; 160 } 161 162 163 static struct radius_session * 164 radius_server_get_session(struct radius_client *client, unsigned int sess_id) 165 { 166 struct radius_session *sess = client->sessions; 167 168 while (sess) { 169 if (sess->sess_id == sess_id) { 170 break; 171 } 172 sess = sess->next; 173 } 174 175 return sess; 176 } 177 178 179 static void radius_server_session_free(struct radius_server_data *data, 180 struct radius_session *sess) 181 { 182 eloop_cancel_timeout(radius_server_session_timeout, data, sess); 183 eloop_cancel_timeout(radius_server_session_remove_timeout, data, sess); 184 eap_server_sm_deinit(sess->eap); 185 if (sess->last_msg) { 186 radius_msg_free(sess->last_msg); 187 os_free(sess->last_msg); 188 } 189 os_free(sess->last_from_addr); 190 if (sess->last_reply) { 191 radius_msg_free(sess->last_reply); 192 os_free(sess->last_reply); 193 } 194 os_free(sess); 195 data->num_sess--; 196 } 197 198 199 static void radius_server_session_remove(struct radius_server_data *data, 200 struct radius_session *sess) 201 { 202 struct radius_client *client = sess->client; 203 struct radius_session *session, *prev; 204 205 eloop_cancel_timeout(radius_server_session_remove_timeout, data, sess); 206 207 prev = NULL; 208 session = client->sessions; 209 while (session) { 210 if (session == sess) { 211 if (prev == NULL) { 212 client->sessions = sess->next; 213 } else { 214 prev->next = sess->next; 215 } 216 radius_server_session_free(data, sess); 217 break; 218 } 219 prev = session; 220 session = session->next; 221 } 222 } 223 224 225 static void radius_server_session_remove_timeout(void *eloop_ctx, 226 void *timeout_ctx) 227 { 228 struct radius_server_data *data = eloop_ctx; 229 struct radius_session *sess = timeout_ctx; 230 RADIUS_DEBUG("Removing completed session 0x%x", sess->sess_id); 231 radius_server_session_remove(data, sess); 232 } 233 234 235 static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx) 236 { 237 struct radius_server_data *data = eloop_ctx; 238 struct radius_session *sess = timeout_ctx; 239 240 RADIUS_DEBUG("Timing out authentication session 0x%x", sess->sess_id); 241 radius_server_session_remove(data, sess); 242 } 243 244 245 static struct radius_session * 246 radius_server_new_session(struct radius_server_data *data, 247 struct radius_client *client) 248 { 249 struct radius_session *sess; 250 251 if (data->num_sess >= RADIUS_MAX_SESSION) { 252 RADIUS_DEBUG("Maximum number of existing session - no room " 253 "for a new session"); 254 return NULL; 255 } 256 257 sess = os_zalloc(sizeof(*sess)); 258 if (sess == NULL) 259 return NULL; 260 261 sess->server = data; 262 sess->client = client; 263 sess->sess_id = data->next_sess_id++; 264 sess->next = client->sessions; 265 client->sessions = sess; 266 eloop_register_timeout(RADIUS_SESSION_TIMEOUT, 0, 267 radius_server_session_timeout, data, sess); 268 data->num_sess++; 269 return sess; 270 } 271 272 273 static struct radius_session * 274 radius_server_get_new_session(struct radius_server_data *data, 275 struct radius_client *client, 276 struct radius_msg *msg) 277 { 278 u8 *user; 279 size_t user_len; 280 int res; 281 struct radius_session *sess; 282 struct eap_config eap_conf; 283 284 RADIUS_DEBUG("Creating a new session"); 285 286 user = os_malloc(256); 287 if (user == NULL) { 288 return NULL; 289 } 290 res = radius_msg_get_attr(msg, RADIUS_ATTR_USER_NAME, user, 256); 291 if (res < 0 || res > 256) { 292 RADIUS_DEBUG("Could not get User-Name"); 293 os_free(user); 294 return NULL; 295 } 296 user_len = res; 297 RADIUS_DUMP_ASCII("User-Name", user, user_len); 298 299 res = data->get_eap_user(data->conf_ctx, user, user_len, 0, NULL); 300 os_free(user); 301 302 if (res == 0) { 303 RADIUS_DEBUG("Matching user entry found"); 304 sess = radius_server_new_session(data, client); 305 if (sess == NULL) { 306 RADIUS_DEBUG("Failed to create a new session"); 307 return NULL; 308 } 309 } else { 310 RADIUS_DEBUG("User-Name not found from user database"); 311 return NULL; 312 } 313 314 os_memset(&eap_conf, 0, sizeof(eap_conf)); 315 eap_conf.ssl_ctx = data->ssl_ctx; 316 eap_conf.eap_sim_db_priv = data->eap_sim_db_priv; 317 eap_conf.backend_auth = TRUE; 318 eap_conf.eap_server = 1; 319 eap_conf.pac_opaque_encr_key = data->pac_opaque_encr_key; 320 eap_conf.eap_fast_a_id = data->eap_fast_a_id; 321 eap_conf.eap_fast_a_id_len = data->eap_fast_a_id_len; 322 eap_conf.eap_fast_a_id_info = data->eap_fast_a_id_info; 323 eap_conf.eap_fast_prov = data->eap_fast_prov; 324 eap_conf.pac_key_lifetime = data->pac_key_lifetime; 325 eap_conf.pac_key_refresh_time = data->pac_key_refresh_time; 326 eap_conf.eap_sim_aka_result_ind = data->eap_sim_aka_result_ind; 327 eap_conf.tnc = data->tnc; 328 eap_conf.wps = data->wps; 329 sess->eap = eap_server_sm_init(sess, &radius_server_eapol_cb, 330 &eap_conf); 331 if (sess->eap == NULL) { 332 RADIUS_DEBUG("Failed to initialize EAP state machine for the " 333 "new session"); 334 radius_server_session_free(data, sess); 335 return NULL; 336 } 337 sess->eap_if = eap_get_interface(sess->eap); 338 sess->eap_if->eapRestart = TRUE; 339 sess->eap_if->portEnabled = TRUE; 340 341 RADIUS_DEBUG("New session 0x%x initialized", sess->sess_id); 342 343 return sess; 344 } 345 346 347 static struct radius_msg * 348 radius_server_encapsulate_eap(struct radius_server_data *data, 349 struct radius_client *client, 350 struct radius_session *sess, 351 struct radius_msg *request) 352 { 353 struct radius_msg *msg; 354 int code; 355 unsigned int sess_id; 356 357 if (sess->eap_if->eapFail) { 358 sess->eap_if->eapFail = FALSE; 359 code = RADIUS_CODE_ACCESS_REJECT; 360 } else if (sess->eap_if->eapSuccess) { 361 sess->eap_if->eapSuccess = FALSE; 362 code = RADIUS_CODE_ACCESS_ACCEPT; 363 } else { 364 sess->eap_if->eapReq = FALSE; 365 code = RADIUS_CODE_ACCESS_CHALLENGE; 366 } 367 368 msg = radius_msg_new(code, request->hdr->identifier); 369 if (msg == NULL) { 370 RADIUS_DEBUG("Failed to allocate reply message"); 371 return NULL; 372 } 373 374 sess_id = htonl(sess->sess_id); 375 if (code == RADIUS_CODE_ACCESS_CHALLENGE && 376 !radius_msg_add_attr(msg, RADIUS_ATTR_STATE, 377 (u8 *) &sess_id, sizeof(sess_id))) { 378 RADIUS_DEBUG("Failed to add State attribute"); 379 } 380 381 if (sess->eap_if->eapReqData && 382 !radius_msg_add_eap(msg, wpabuf_head(sess->eap_if->eapReqData), 383 wpabuf_len(sess->eap_if->eapReqData))) { 384 RADIUS_DEBUG("Failed to add EAP-Message attribute"); 385 } 386 387 if (code == RADIUS_CODE_ACCESS_ACCEPT && sess->eap_if->eapKeyData) { 388 int len; 389 if (sess->eap_if->eapKeyDataLen > 64) { 390 len = 32; 391 } else { 392 len = sess->eap_if->eapKeyDataLen / 2; 393 } 394 if (!radius_msg_add_mppe_keys(msg, request->hdr->authenticator, 395 (u8 *) client->shared_secret, 396 client->shared_secret_len, 397 sess->eap_if->eapKeyData + len, 398 len, sess->eap_if->eapKeyData, 399 len)) { 400 RADIUS_DEBUG("Failed to add MPPE key attributes"); 401 } 402 } 403 404 if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) { 405 RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)"); 406 radius_msg_free(msg); 407 os_free(msg); 408 return NULL; 409 } 410 411 if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret, 412 client->shared_secret_len, 413 request->hdr->authenticator) < 0) { 414 RADIUS_DEBUG("Failed to add Message-Authenticator attribute"); 415 } 416 417 return msg; 418 } 419 420 421 static int radius_server_reject(struct radius_server_data *data, 422 struct radius_client *client, 423 struct radius_msg *request, 424 struct sockaddr *from, socklen_t fromlen, 425 const char *from_addr, int from_port) 426 { 427 struct radius_msg *msg; 428 int ret = 0; 429 struct eap_hdr eapfail; 430 431 RADIUS_DEBUG("Reject invalid request from %s:%d", 432 from_addr, from_port); 433 434 msg = radius_msg_new(RADIUS_CODE_ACCESS_REJECT, 435 request->hdr->identifier); 436 if (msg == NULL) { 437 return -1; 438 } 439 440 os_memset(&eapfail, 0, sizeof(eapfail)); 441 eapfail.code = EAP_CODE_FAILURE; 442 eapfail.identifier = 0; 443 eapfail.length = host_to_be16(sizeof(eapfail)); 444 445 if (!radius_msg_add_eap(msg, (u8 *) &eapfail, sizeof(eapfail))) { 446 RADIUS_DEBUG("Failed to add EAP-Message attribute"); 447 } 448 449 if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) { 450 RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)"); 451 radius_msg_free(msg); 452 os_free(msg); 453 return -1; 454 } 455 456 if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret, 457 client->shared_secret_len, 458 request->hdr->authenticator) < 0) { 459 RADIUS_DEBUG("Failed to add Message-Authenticator attribute"); 460 } 461 462 if (wpa_debug_level <= MSG_MSGDUMP) { 463 radius_msg_dump(msg); 464 } 465 466 data->counters.access_rejects++; 467 client->counters.access_rejects++; 468 if (sendto(data->auth_sock, msg->buf, msg->buf_used, 0, 469 (struct sockaddr *) from, sizeof(*from)) < 0) { 470 perror("sendto[RADIUS SRV]"); 471 ret = -1; 472 } 473 474 radius_msg_free(msg); 475 os_free(msg); 476 477 return ret; 478 } 479 480 481 static int radius_server_request(struct radius_server_data *data, 482 struct radius_msg *msg, 483 struct sockaddr *from, socklen_t fromlen, 484 struct radius_client *client, 485 const char *from_addr, int from_port, 486 struct radius_session *force_sess) 487 { 488 u8 *eap = NULL; 489 size_t eap_len; 490 int res, state_included = 0; 491 u8 statebuf[4]; 492 unsigned int state; 493 struct radius_session *sess; 494 struct radius_msg *reply; 495 int is_complete = 0; 496 497 if (force_sess) 498 sess = force_sess; 499 else { 500 res = radius_msg_get_attr(msg, RADIUS_ATTR_STATE, statebuf, 501 sizeof(statebuf)); 502 state_included = res >= 0; 503 if (res == sizeof(statebuf)) { 504 state = WPA_GET_BE32(statebuf); 505 sess = radius_server_get_session(client, state); 506 } else { 507 sess = NULL; 508 } 509 } 510 511 if (sess) { 512 RADIUS_DEBUG("Request for session 0x%x", sess->sess_id); 513 } else if (state_included) { 514 RADIUS_DEBUG("State attribute included but no session found"); 515 radius_server_reject(data, client, msg, from, fromlen, 516 from_addr, from_port); 517 return -1; 518 } else { 519 sess = radius_server_get_new_session(data, client, msg); 520 if (sess == NULL) { 521 RADIUS_DEBUG("Could not create a new session"); 522 radius_server_reject(data, client, msg, from, fromlen, 523 from_addr, from_port); 524 return -1; 525 } 526 } 527 528 if (sess->last_from_port == from_port && 529 sess->last_identifier == msg->hdr->identifier && 530 os_memcmp(sess->last_authenticator, msg->hdr->authenticator, 16) == 531 0) { 532 RADIUS_DEBUG("Duplicate message from %s", from_addr); 533 data->counters.dup_access_requests++; 534 client->counters.dup_access_requests++; 535 536 if (sess->last_reply) { 537 res = sendto(data->auth_sock, sess->last_reply->buf, 538 sess->last_reply->buf_used, 0, 539 (struct sockaddr *) from, fromlen); 540 if (res < 0) { 541 perror("sendto[RADIUS SRV]"); 542 } 543 return 0; 544 } 545 546 RADIUS_DEBUG("No previous reply available for duplicate " 547 "message"); 548 return -1; 549 } 550 551 eap = radius_msg_get_eap(msg, &eap_len); 552 if (eap == NULL) { 553 RADIUS_DEBUG("No EAP-Message in RADIUS packet from %s", 554 from_addr); 555 data->counters.packets_dropped++; 556 client->counters.packets_dropped++; 557 return -1; 558 } 559 560 RADIUS_DUMP("Received EAP data", eap, eap_len); 561 562 /* FIX: if Code is Request, Success, or Failure, send Access-Reject; 563 * RFC3579 Sect. 2.6.2. 564 * Include EAP-Response/Nak with no preferred method if 565 * code == request. 566 * If code is not 1-4, discard the packet silently. 567 * Or is this already done by the EAP state machine? */ 568 569 wpabuf_free(sess->eap_if->eapRespData); 570 sess->eap_if->eapRespData = wpabuf_alloc_ext_data(eap, eap_len); 571 if (sess->eap_if->eapRespData == NULL) 572 os_free(eap); 573 eap = NULL; 574 sess->eap_if->eapResp = TRUE; 575 eap_server_sm_step(sess->eap); 576 577 if ((sess->eap_if->eapReq || sess->eap_if->eapSuccess || 578 sess->eap_if->eapFail) && sess->eap_if->eapReqData) { 579 RADIUS_DUMP("EAP data from the state machine", 580 wpabuf_head(sess->eap_if->eapReqData), 581 wpabuf_len(sess->eap_if->eapReqData)); 582 } else if (sess->eap_if->eapFail) { 583 RADIUS_DEBUG("No EAP data from the state machine, but eapFail " 584 "set"); 585 } else if (eap_sm_method_pending(sess->eap)) { 586 if (sess->last_msg) { 587 radius_msg_free(sess->last_msg); 588 os_free(sess->last_msg); 589 } 590 sess->last_msg = msg; 591 sess->last_from_port = from_port; 592 os_free(sess->last_from_addr); 593 sess->last_from_addr = os_strdup(from_addr); 594 sess->last_fromlen = fromlen; 595 os_memcpy(&sess->last_from, from, fromlen); 596 return -2; 597 } else { 598 RADIUS_DEBUG("No EAP data from the state machine - ignore this" 599 " Access-Request silently (assuming it was a " 600 "duplicate)"); 601 data->counters.packets_dropped++; 602 client->counters.packets_dropped++; 603 return -1; 604 } 605 606 if (sess->eap_if->eapSuccess || sess->eap_if->eapFail) 607 is_complete = 1; 608 609 reply = radius_server_encapsulate_eap(data, client, sess, msg); 610 611 if (reply) { 612 RADIUS_DEBUG("Reply to %s:%d", from_addr, from_port); 613 if (wpa_debug_level <= MSG_MSGDUMP) { 614 radius_msg_dump(reply); 615 } 616 617 switch (reply->hdr->code) { 618 case RADIUS_CODE_ACCESS_ACCEPT: 619 data->counters.access_accepts++; 620 client->counters.access_accepts++; 621 break; 622 case RADIUS_CODE_ACCESS_REJECT: 623 data->counters.access_rejects++; 624 client->counters.access_rejects++; 625 break; 626 case RADIUS_CODE_ACCESS_CHALLENGE: 627 data->counters.access_challenges++; 628 client->counters.access_challenges++; 629 break; 630 } 631 res = sendto(data->auth_sock, reply->buf, reply->buf_used, 0, 632 (struct sockaddr *) from, fromlen); 633 if (res < 0) { 634 perror("sendto[RADIUS SRV]"); 635 } 636 if (sess->last_reply) { 637 radius_msg_free(sess->last_reply); 638 os_free(sess->last_reply); 639 } 640 sess->last_reply = reply; 641 sess->last_from_port = from_port; 642 sess->last_identifier = msg->hdr->identifier; 643 os_memcpy(sess->last_authenticator, msg->hdr->authenticator, 644 16); 645 } else { 646 data->counters.packets_dropped++; 647 client->counters.packets_dropped++; 648 } 649 650 if (is_complete) { 651 RADIUS_DEBUG("Removing completed session 0x%x after timeout", 652 sess->sess_id); 653 eloop_cancel_timeout(radius_server_session_remove_timeout, 654 data, sess); 655 eloop_register_timeout(10, 0, 656 radius_server_session_remove_timeout, 657 data, sess); 658 } 659 660 return 0; 661 } 662 663 664 static void radius_server_receive_auth(int sock, void *eloop_ctx, 665 void *sock_ctx) 666 { 667 struct radius_server_data *data = eloop_ctx; 668 u8 *buf = NULL; 669 union { 670 struct sockaddr_storage ss; 671 struct sockaddr_in sin; 672 #ifdef CONFIG_IPV6 673 struct sockaddr_in6 sin6; 674 #endif /* CONFIG_IPV6 */ 675 } from; 676 socklen_t fromlen; 677 int len; 678 struct radius_client *client = NULL; 679 struct radius_msg *msg = NULL; 680 char abuf[50]; 681 int from_port = 0; 682 683 buf = os_malloc(RADIUS_MAX_MSG_LEN); 684 if (buf == NULL) { 685 goto fail; 686 } 687 688 fromlen = sizeof(from); 689 len = recvfrom(sock, buf, RADIUS_MAX_MSG_LEN, 0, 690 (struct sockaddr *) &from.ss, &fromlen); 691 if (len < 0) { 692 perror("recvfrom[radius_server]"); 693 goto fail; 694 } 695 696 #ifdef CONFIG_IPV6 697 if (data->ipv6) { 698 if (inet_ntop(AF_INET6, &from.sin6.sin6_addr, abuf, 699 sizeof(abuf)) == NULL) 700 abuf[0] = '\0'; 701 from_port = ntohs(from.sin6.sin6_port); 702 RADIUS_DEBUG("Received %d bytes from %s:%d", 703 len, abuf, from_port); 704 705 client = radius_server_get_client(data, 706 (struct in_addr *) 707 &from.sin6.sin6_addr, 1); 708 } 709 #endif /* CONFIG_IPV6 */ 710 711 if (!data->ipv6) { 712 os_strlcpy(abuf, inet_ntoa(from.sin.sin_addr), sizeof(abuf)); 713 from_port = ntohs(from.sin.sin_port); 714 RADIUS_DEBUG("Received %d bytes from %s:%d", 715 len, abuf, from_port); 716 717 client = radius_server_get_client(data, &from.sin.sin_addr, 0); 718 } 719 720 RADIUS_DUMP("Received data", buf, len); 721 722 if (client == NULL) { 723 RADIUS_DEBUG("Unknown client %s - packet ignored", abuf); 724 data->counters.invalid_requests++; 725 goto fail; 726 } 727 728 msg = radius_msg_parse(buf, len); 729 if (msg == NULL) { 730 RADIUS_DEBUG("Parsing incoming RADIUS frame failed"); 731 data->counters.malformed_access_requests++; 732 client->counters.malformed_access_requests++; 733 goto fail; 734 } 735 736 os_free(buf); 737 buf = NULL; 738 739 if (wpa_debug_level <= MSG_MSGDUMP) { 740 radius_msg_dump(msg); 741 } 742 743 if (msg->hdr->code != RADIUS_CODE_ACCESS_REQUEST) { 744 RADIUS_DEBUG("Unexpected RADIUS code %d", msg->hdr->code); 745 data->counters.unknown_types++; 746 client->counters.unknown_types++; 747 goto fail; 748 } 749 750 data->counters.access_requests++; 751 client->counters.access_requests++; 752 753 if (radius_msg_verify_msg_auth(msg, (u8 *) client->shared_secret, 754 client->shared_secret_len, NULL)) { 755 RADIUS_DEBUG("Invalid Message-Authenticator from %s", abuf); 756 data->counters.bad_authenticators++; 757 client->counters.bad_authenticators++; 758 goto fail; 759 } 760 761 if (radius_server_request(data, msg, (struct sockaddr *) &from, 762 fromlen, client, abuf, from_port, NULL) == 763 -2) 764 return; /* msg was stored with the session */ 765 766 fail: 767 if (msg) { 768 radius_msg_free(msg); 769 os_free(msg); 770 } 771 os_free(buf); 772 } 773 774 775 static int radius_server_disable_pmtu_discovery(int s) 776 { 777 int r = -1; 778 #if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT) 779 /* Turn off Path MTU discovery on IPv4/UDP sockets. */ 780 int action = IP_PMTUDISC_DONT; 781 r = setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER, &action, 782 sizeof(action)); 783 if (r == -1) 784 wpa_printf(MSG_ERROR, "Failed to set IP_MTU_DISCOVER: " 785 "%s", strerror(errno)); 786 #endif 787 return r; 788 } 789 790 791 static int radius_server_open_socket(int port) 792 { 793 int s; 794 struct sockaddr_in addr; 795 796 s = socket(PF_INET, SOCK_DGRAM, 0); 797 if (s < 0) { 798 perror("socket"); 799 return -1; 800 } 801 802 radius_server_disable_pmtu_discovery(s); 803 804 os_memset(&addr, 0, sizeof(addr)); 805 addr.sin_family = AF_INET; 806 addr.sin_port = htons(port); 807 if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) { 808 perror("bind"); 809 close(s); 810 return -1; 811 } 812 813 return s; 814 } 815 816 817 #ifdef CONFIG_IPV6 818 static int radius_server_open_socket6(int port) 819 { 820 int s; 821 struct sockaddr_in6 addr; 822 823 s = socket(PF_INET6, SOCK_DGRAM, 0); 824 if (s < 0) { 825 perror("socket[IPv6]"); 826 return -1; 827 } 828 829 os_memset(&addr, 0, sizeof(addr)); 830 addr.sin6_family = AF_INET6; 831 os_memcpy(&addr.sin6_addr, &in6addr_any, sizeof(in6addr_any)); 832 addr.sin6_port = htons(port); 833 if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) { 834 perror("bind"); 835 close(s); 836 return -1; 837 } 838 839 return s; 840 } 841 #endif /* CONFIG_IPV6 */ 842 843 844 static void radius_server_free_sessions(struct radius_server_data *data, 845 struct radius_session *sessions) 846 { 847 struct radius_session *session, *prev; 848 849 session = sessions; 850 while (session) { 851 prev = session; 852 session = session->next; 853 radius_server_session_free(data, prev); 854 } 855 } 856 857 858 static void radius_server_free_clients(struct radius_server_data *data, 859 struct radius_client *clients) 860 { 861 struct radius_client *client, *prev; 862 863 client = clients; 864 while (client) { 865 prev = client; 866 client = client->next; 867 868 radius_server_free_sessions(data, prev->sessions); 869 os_free(prev->shared_secret); 870 os_free(prev); 871 } 872 } 873 874 875 static struct radius_client * 876 radius_server_read_clients(const char *client_file, int ipv6) 877 { 878 FILE *f; 879 const int buf_size = 1024; 880 char *buf, *pos; 881 struct radius_client *clients, *tail, *entry; 882 int line = 0, mask, failed = 0, i; 883 struct in_addr addr; 884 #ifdef CONFIG_IPV6 885 struct in6_addr addr6; 886 #endif /* CONFIG_IPV6 */ 887 unsigned int val; 888 889 f = fopen(client_file, "r"); 890 if (f == NULL) { 891 RADIUS_ERROR("Could not open client file '%s'", client_file); 892 return NULL; 893 } 894 895 buf = os_malloc(buf_size); 896 if (buf == NULL) { 897 fclose(f); 898 return NULL; 899 } 900 901 clients = tail = NULL; 902 while (fgets(buf, buf_size, f)) { 903 /* Configuration file format: 904 * 192.168.1.0/24 secret 905 * 192.168.1.2 secret 906 * fe80::211:22ff:fe33:4455/64 secretipv6 907 */ 908 line++; 909 buf[buf_size - 1] = '\0'; 910 pos = buf; 911 while (*pos != '\0' && *pos != '\n') 912 pos++; 913 if (*pos == '\n') 914 *pos = '\0'; 915 if (*buf == '\0' || *buf == '#') 916 continue; 917 918 pos = buf; 919 while ((*pos >= '0' && *pos <= '9') || *pos == '.' || 920 (*pos >= 'a' && *pos <= 'f') || *pos == ':' || 921 (*pos >= 'A' && *pos <= 'F')) { 922 pos++; 923 } 924 925 if (*pos == '\0') { 926 failed = 1; 927 break; 928 } 929 930 if (*pos == '/') { 931 char *end; 932 *pos++ = '\0'; 933 mask = strtol(pos, &end, 10); 934 if ((pos == end) || 935 (mask < 0 || mask > (ipv6 ? 128 : 32))) { 936 failed = 1; 937 break; 938 } 939 pos = end; 940 } else { 941 mask = ipv6 ? 128 : 32; 942 *pos++ = '\0'; 943 } 944 945 if (!ipv6 && inet_aton(buf, &addr) == 0) { 946 failed = 1; 947 break; 948 } 949 #ifdef CONFIG_IPV6 950 if (ipv6 && inet_pton(AF_INET6, buf, &addr6) <= 0) { 951 if (inet_pton(AF_INET, buf, &addr) <= 0) { 952 failed = 1; 953 break; 954 } 955 /* Convert IPv4 address to IPv6 */ 956 if (mask <= 32) 957 mask += (128 - 32); 958 os_memset(addr6.s6_addr, 0, 10); 959 addr6.s6_addr[10] = 0xff; 960 addr6.s6_addr[11] = 0xff; 961 os_memcpy(addr6.s6_addr + 12, (char *) &addr.s_addr, 962 4); 963 } 964 #endif /* CONFIG_IPV6 */ 965 966 while (*pos == ' ' || *pos == '\t') { 967 pos++; 968 } 969 970 if (*pos == '\0') { 971 failed = 1; 972 break; 973 } 974 975 entry = os_zalloc(sizeof(*entry)); 976 if (entry == NULL) { 977 failed = 1; 978 break; 979 } 980 entry->shared_secret = os_strdup(pos); 981 if (entry->shared_secret == NULL) { 982 failed = 1; 983 os_free(entry); 984 break; 985 } 986 entry->shared_secret_len = os_strlen(entry->shared_secret); 987 entry->addr.s_addr = addr.s_addr; 988 if (!ipv6) { 989 val = 0; 990 for (i = 0; i < mask; i++) 991 val |= 1 << (31 - i); 992 entry->mask.s_addr = htonl(val); 993 } 994 #ifdef CONFIG_IPV6 995 if (ipv6) { 996 int offset = mask / 8; 997 998 os_memcpy(entry->addr6.s6_addr, addr6.s6_addr, 16); 999 os_memset(entry->mask6.s6_addr, 0xff, offset); 1000 val = 0; 1001 for (i = 0; i < (mask % 8); i++) 1002 val |= 1 << (7 - i); 1003 if (offset < 16) 1004 entry->mask6.s6_addr[offset] = val; 1005 } 1006 #endif /* CONFIG_IPV6 */ 1007 1008 if (tail == NULL) { 1009 clients = tail = entry; 1010 } else { 1011 tail->next = entry; 1012 tail = entry; 1013 } 1014 } 1015 1016 if (failed) { 1017 RADIUS_ERROR("Invalid line %d in '%s'", line, client_file); 1018 radius_server_free_clients(NULL, clients); 1019 clients = NULL; 1020 } 1021 1022 os_free(buf); 1023 fclose(f); 1024 1025 return clients; 1026 } 1027 1028 1029 struct radius_server_data * 1030 radius_server_init(struct radius_server_conf *conf) 1031 { 1032 struct radius_server_data *data; 1033 1034 #ifndef CONFIG_IPV6 1035 if (conf->ipv6) { 1036 fprintf(stderr, "RADIUS server compiled without IPv6 " 1037 "support.\n"); 1038 return NULL; 1039 } 1040 #endif /* CONFIG_IPV6 */ 1041 1042 data = os_zalloc(sizeof(*data)); 1043 if (data == NULL) 1044 return NULL; 1045 1046 os_get_time(&data->start_time); 1047 data->conf_ctx = conf->conf_ctx; 1048 data->eap_sim_db_priv = conf->eap_sim_db_priv; 1049 data->ssl_ctx = conf->ssl_ctx; 1050 data->ipv6 = conf->ipv6; 1051 if (conf->pac_opaque_encr_key) { 1052 data->pac_opaque_encr_key = os_malloc(16); 1053 os_memcpy(data->pac_opaque_encr_key, conf->pac_opaque_encr_key, 1054 16); 1055 } 1056 if (conf->eap_fast_a_id) { 1057 data->eap_fast_a_id = os_malloc(conf->eap_fast_a_id_len); 1058 if (data->eap_fast_a_id) { 1059 os_memcpy(data->eap_fast_a_id, conf->eap_fast_a_id, 1060 conf->eap_fast_a_id_len); 1061 data->eap_fast_a_id_len = conf->eap_fast_a_id_len; 1062 } 1063 } 1064 if (conf->eap_fast_a_id_info) 1065 data->eap_fast_a_id_info = os_strdup(conf->eap_fast_a_id_info); 1066 data->eap_fast_prov = conf->eap_fast_prov; 1067 data->pac_key_lifetime = conf->pac_key_lifetime; 1068 data->pac_key_refresh_time = conf->pac_key_refresh_time; 1069 data->get_eap_user = conf->get_eap_user; 1070 data->eap_sim_aka_result_ind = conf->eap_sim_aka_result_ind; 1071 data->tnc = conf->tnc; 1072 data->wps = conf->wps; 1073 if (conf->eap_req_id_text) { 1074 data->eap_req_id_text = os_malloc(conf->eap_req_id_text_len); 1075 if (data->eap_req_id_text) { 1076 os_memcpy(data->eap_req_id_text, conf->eap_req_id_text, 1077 conf->eap_req_id_text_len); 1078 data->eap_req_id_text_len = conf->eap_req_id_text_len; 1079 } 1080 } 1081 1082 data->clients = radius_server_read_clients(conf->client_file, 1083 conf->ipv6); 1084 if (data->clients == NULL) { 1085 printf("No RADIUS clients configured.\n"); 1086 radius_server_deinit(data); 1087 return NULL; 1088 } 1089 1090 #ifdef CONFIG_IPV6 1091 if (conf->ipv6) 1092 data->auth_sock = radius_server_open_socket6(conf->auth_port); 1093 else 1094 #endif /* CONFIG_IPV6 */ 1095 data->auth_sock = radius_server_open_socket(conf->auth_port); 1096 if (data->auth_sock < 0) { 1097 printf("Failed to open UDP socket for RADIUS authentication " 1098 "server\n"); 1099 radius_server_deinit(data); 1100 return NULL; 1101 } 1102 if (eloop_register_read_sock(data->auth_sock, 1103 radius_server_receive_auth, 1104 data, NULL)) { 1105 radius_server_deinit(data); 1106 return NULL; 1107 } 1108 1109 return data; 1110 } 1111 1112 1113 void radius_server_deinit(struct radius_server_data *data) 1114 { 1115 if (data == NULL) 1116 return; 1117 1118 if (data->auth_sock >= 0) { 1119 eloop_unregister_read_sock(data->auth_sock); 1120 close(data->auth_sock); 1121 } 1122 1123 radius_server_free_clients(data, data->clients); 1124 1125 os_free(data->pac_opaque_encr_key); 1126 os_free(data->eap_fast_a_id); 1127 os_free(data->eap_fast_a_id_info); 1128 os_free(data->eap_req_id_text); 1129 os_free(data); 1130 } 1131 1132 1133 int radius_server_get_mib(struct radius_server_data *data, char *buf, 1134 size_t buflen) 1135 { 1136 int ret, uptime; 1137 unsigned int idx; 1138 char *end, *pos; 1139 struct os_time now; 1140 struct radius_client *cli; 1141 1142 /* RFC 2619 - RADIUS Authentication Server MIB */ 1143 1144 if (data == NULL || buflen == 0) 1145 return 0; 1146 1147 pos = buf; 1148 end = buf + buflen; 1149 1150 os_get_time(&now); 1151 uptime = (now.sec - data->start_time.sec) * 100 + 1152 ((now.usec - data->start_time.usec) / 10000) % 100; 1153 ret = os_snprintf(pos, end - pos, 1154 "RADIUS-AUTH-SERVER-MIB\n" 1155 "radiusAuthServIdent=hostapd\n" 1156 "radiusAuthServUpTime=%d\n" 1157 "radiusAuthServResetTime=0\n" 1158 "radiusAuthServConfigReset=4\n", 1159 uptime); 1160 if (ret < 0 || ret >= end - pos) { 1161 *pos = '\0'; 1162 return pos - buf; 1163 } 1164 pos += ret; 1165 1166 ret = os_snprintf(pos, end - pos, 1167 "radiusAuthServTotalAccessRequests=%u\n" 1168 "radiusAuthServTotalInvalidRequests=%u\n" 1169 "radiusAuthServTotalDupAccessRequests=%u\n" 1170 "radiusAuthServTotalAccessAccepts=%u\n" 1171 "radiusAuthServTotalAccessRejects=%u\n" 1172 "radiusAuthServTotalAccessChallenges=%u\n" 1173 "radiusAuthServTotalMalformedAccessRequests=%u\n" 1174 "radiusAuthServTotalBadAuthenticators=%u\n" 1175 "radiusAuthServTotalPacketsDropped=%u\n" 1176 "radiusAuthServTotalUnknownTypes=%u\n", 1177 data->counters.access_requests, 1178 data->counters.invalid_requests, 1179 data->counters.dup_access_requests, 1180 data->counters.access_accepts, 1181 data->counters.access_rejects, 1182 data->counters.access_challenges, 1183 data->counters.malformed_access_requests, 1184 data->counters.bad_authenticators, 1185 data->counters.packets_dropped, 1186 data->counters.unknown_types); 1187 if (ret < 0 || ret >= end - pos) { 1188 *pos = '\0'; 1189 return pos - buf; 1190 } 1191 pos += ret; 1192 1193 for (cli = data->clients, idx = 0; cli; cli = cli->next, idx++) { 1194 char abuf[50], mbuf[50]; 1195 #ifdef CONFIG_IPV6 1196 if (data->ipv6) { 1197 if (inet_ntop(AF_INET6, &cli->addr6, abuf, 1198 sizeof(abuf)) == NULL) 1199 abuf[0] = '\0'; 1200 if (inet_ntop(AF_INET6, &cli->mask6, abuf, 1201 sizeof(mbuf)) == NULL) 1202 mbuf[0] = '\0'; 1203 } 1204 #endif /* CONFIG_IPV6 */ 1205 if (!data->ipv6) { 1206 os_strlcpy(abuf, inet_ntoa(cli->addr), sizeof(abuf)); 1207 os_strlcpy(mbuf, inet_ntoa(cli->mask), sizeof(mbuf)); 1208 } 1209 1210 ret = os_snprintf(pos, end - pos, 1211 "radiusAuthClientIndex=%u\n" 1212 "radiusAuthClientAddress=%s/%s\n" 1213 "radiusAuthServAccessRequests=%u\n" 1214 "radiusAuthServDupAccessRequests=%u\n" 1215 "radiusAuthServAccessAccepts=%u\n" 1216 "radiusAuthServAccessRejects=%u\n" 1217 "radiusAuthServAccessChallenges=%u\n" 1218 "radiusAuthServMalformedAccessRequests=%u\n" 1219 "radiusAuthServBadAuthenticators=%u\n" 1220 "radiusAuthServPacketsDropped=%u\n" 1221 "radiusAuthServUnknownTypes=%u\n", 1222 idx, 1223 abuf, mbuf, 1224 cli->counters.access_requests, 1225 cli->counters.dup_access_requests, 1226 cli->counters.access_accepts, 1227 cli->counters.access_rejects, 1228 cli->counters.access_challenges, 1229 cli->counters.malformed_access_requests, 1230 cli->counters.bad_authenticators, 1231 cli->counters.packets_dropped, 1232 cli->counters.unknown_types); 1233 if (ret < 0 || ret >= end - pos) { 1234 *pos = '\0'; 1235 return pos - buf; 1236 } 1237 pos += ret; 1238 } 1239 1240 return pos - buf; 1241 } 1242 1243 1244 static int radius_server_get_eap_user(void *ctx, const u8 *identity, 1245 size_t identity_len, int phase2, 1246 struct eap_user *user) 1247 { 1248 struct radius_session *sess = ctx; 1249 struct radius_server_data *data = sess->server; 1250 1251 return data->get_eap_user(data->conf_ctx, identity, identity_len, 1252 phase2, user); 1253 } 1254 1255 1256 static const char * radius_server_get_eap_req_id_text(void *ctx, size_t *len) 1257 { 1258 struct radius_session *sess = ctx; 1259 struct radius_server_data *data = sess->server; 1260 *len = data->eap_req_id_text_len; 1261 return data->eap_req_id_text; 1262 } 1263 1264 1265 static struct eapol_callbacks radius_server_eapol_cb = 1266 { 1267 .get_eap_user = radius_server_get_eap_user, 1268 .get_eap_req_id_text = radius_server_get_eap_req_id_text, 1269 }; 1270 1271 1272 void radius_server_eap_pending_cb(struct radius_server_data *data, void *ctx) 1273 { 1274 struct radius_client *cli; 1275 struct radius_session *s, *sess = NULL; 1276 struct radius_msg *msg; 1277 1278 if (data == NULL) 1279 return; 1280 1281 for (cli = data->clients; cli; cli = cli->next) { 1282 for (s = cli->sessions; s; s = s->next) { 1283 if (s->eap == ctx && s->last_msg) { 1284 sess = s; 1285 break; 1286 } 1287 if (sess) 1288 break; 1289 } 1290 if (sess) 1291 break; 1292 } 1293 1294 if (sess == NULL) { 1295 RADIUS_DEBUG("No session matched callback ctx"); 1296 return; 1297 } 1298 1299 msg = sess->last_msg; 1300 sess->last_msg = NULL; 1301 eap_sm_pending_cb(sess->eap); 1302 if (radius_server_request(data, msg, 1303 (struct sockaddr *) &sess->last_from, 1304 sess->last_fromlen, cli, 1305 sess->last_from_addr, 1306 sess->last_from_port, sess) == -2) 1307 return; /* msg was stored with the session */ 1308 1309 radius_msg_free(msg); 1310 os_free(msg); 1311 } 1312
