1 /* 2 * hostapd / RADIUS authentication server 3 * Copyright (c) 2005-2008, 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 #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); 120 121 122 123 static struct radius_client * 124 radius_server_get_client(struct radius_server_data *data, struct in_addr *addr, 125 int ipv6) 126 { 127 struct radius_client *client = data->clients; 128 129 while (client) { 130 #ifdef CONFIG_IPV6 131 if (ipv6) { 132 struct in6_addr *addr6; 133 int i; 134 135 addr6 = (struct in6_addr *) addr; 136 for (i = 0; i < 16; i++) { 137 if ((addr6->s6_addr[i] & 138 client->mask6.s6_addr[i]) != 139 (client->addr6.s6_addr[i] & 140 client->mask6.s6_addr[i])) { 141 i = 17; 142 break; 143 } 144 } 145 if (i == 16) { 146 break; 147 } 148 } 149 #endif /* CONFIG_IPV6 */ 150 if (!ipv6 && (client->addr.s_addr & client->mask.s_addr) == 151 (addr->s_addr & client->mask.s_addr)) { 152 break; 153 } 154 155 client = client->next; 156 } 157 158 return client; 159 } 160 161 162 static struct radius_session * 163 radius_server_get_session(struct radius_client *client, unsigned int sess_id) 164 { 165 struct radius_session *sess = client->sessions; 166 167 while (sess) { 168 if (sess->sess_id == sess_id) { 169 break; 170 } 171 sess = sess->next; 172 } 173 174 return sess; 175 } 176 177 178 static void radius_server_session_free(struct radius_server_data *data, 179 struct radius_session *sess) 180 { 181 eloop_cancel_timeout(radius_server_session_timeout, data, sess); 182 eap_server_sm_deinit(sess->eap); 183 if (sess->last_msg) { 184 radius_msg_free(sess->last_msg); 185 os_free(sess->last_msg); 186 } 187 os_free(sess->last_from_addr); 188 if (sess->last_reply) { 189 radius_msg_free(sess->last_reply); 190 os_free(sess->last_reply); 191 } 192 os_free(sess); 193 data->num_sess--; 194 } 195 196 197 static void radius_server_session_remove_timeout(void *eloop_ctx, 198 void *timeout_ctx); 199 200 static void radius_server_session_remove(struct radius_server_data *data, 201 struct radius_session *sess) 202 { 203 struct radius_client *client = sess->client; 204 struct radius_session *session, *prev; 205 206 eloop_cancel_timeout(radius_server_session_remove_timeout, data, sess); 207 208 prev = NULL; 209 session = client->sessions; 210 while (session) { 211 if (session == sess) { 212 if (prev == NULL) { 213 client->sessions = sess->next; 214 } else { 215 prev->next = sess->next; 216 } 217 radius_server_session_free(data, sess); 218 break; 219 } 220 prev = session; 221 session = session->next; 222 } 223 } 224 225 226 static void radius_server_session_remove_timeout(void *eloop_ctx, 227 void *timeout_ctx) 228 { 229 struct radius_server_data *data = eloop_ctx; 230 struct radius_session *sess = timeout_ctx; 231 RADIUS_DEBUG("Removing completed session 0x%x", sess->sess_id); 232 radius_server_session_remove(data, sess); 233 } 234 235 236 static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx) 237 { 238 struct radius_server_data *data = eloop_ctx; 239 struct radius_session *sess = timeout_ctx; 240 241 RADIUS_DEBUG("Timing out authentication session 0x%x", sess->sess_id); 242 radius_server_session_remove(data, sess); 243 } 244 245 246 static struct radius_session * 247 radius_server_new_session(struct radius_server_data *data, 248 struct radius_client *client) 249 { 250 struct radius_session *sess; 251 252 if (data->num_sess >= RADIUS_MAX_SESSION) { 253 RADIUS_DEBUG("Maximum number of existing session - no room " 254 "for a new session"); 255 return NULL; 256 } 257 258 sess = os_zalloc(sizeof(*sess)); 259 if (sess == NULL) 260 return NULL; 261 262 sess->server = data; 263 sess->client = client; 264 sess->sess_id = data->next_sess_id++; 265 sess->next = client->sessions; 266 client->sessions = sess; 267 eloop_register_timeout(RADIUS_SESSION_TIMEOUT, 0, 268 radius_server_session_timeout, data, sess); 269 data->num_sess++; 270 return sess; 271 } 272 273 274 static struct radius_session * 275 radius_server_get_new_session(struct radius_server_data *data, 276 struct radius_client *client, 277 struct radius_msg *msg) 278 { 279 u8 *user; 280 size_t user_len; 281 int res; 282 struct radius_session *sess; 283 struct eap_config eap_conf; 284 285 RADIUS_DEBUG("Creating a new session"); 286 287 user = os_malloc(256); 288 if (user == NULL) { 289 return NULL; 290 } 291 res = radius_msg_get_attr(msg, RADIUS_ATTR_USER_NAME, user, 256); 292 if (res < 0 || res > 256) { 293 RADIUS_DEBUG("Could not get User-Name"); 294 os_free(user); 295 return NULL; 296 } 297 user_len = res; 298 RADIUS_DUMP_ASCII("User-Name", user, user_len); 299 300 res = data->get_eap_user(data->conf_ctx, user, user_len, 0, NULL); 301 os_free(user); 302 303 if (res == 0) { 304 RADIUS_DEBUG("Matching user entry found"); 305 sess = radius_server_new_session(data, client); 306 if (sess == NULL) { 307 RADIUS_DEBUG("Failed to create a new session"); 308 return NULL; 309 } 310 } else { 311 RADIUS_DEBUG("User-Name not found from user database"); 312 return NULL; 313 } 314 315 os_memset(&eap_conf, 0, sizeof(eap_conf)); 316 eap_conf.ssl_ctx = data->ssl_ctx; 317 eap_conf.eap_sim_db_priv = data->eap_sim_db_priv; 318 eap_conf.backend_auth = TRUE; 319 eap_conf.eap_server = 1; 320 eap_conf.pac_opaque_encr_key = data->pac_opaque_encr_key; 321 eap_conf.eap_fast_a_id = data->eap_fast_a_id; 322 eap_conf.eap_fast_a_id_len = data->eap_fast_a_id_len; 323 eap_conf.eap_fast_a_id_info = data->eap_fast_a_id_info; 324 eap_conf.eap_fast_prov = data->eap_fast_prov; 325 eap_conf.pac_key_lifetime = data->pac_key_lifetime; 326 eap_conf.pac_key_refresh_time = data->pac_key_refresh_time; 327 eap_conf.eap_sim_aka_result_ind = data->eap_sim_aka_result_ind; 328 eap_conf.tnc = data->tnc; 329 eap_conf.wps = data->wps; 330 sess->eap = eap_server_sm_init(sess, &radius_server_eapol_cb, 331 &eap_conf); 332 if (sess->eap == NULL) { 333 RADIUS_DEBUG("Failed to initialize EAP state machine for the " 334 "new session"); 335 radius_server_session_free(data, sess); 336 return NULL; 337 } 338 sess->eap_if = eap_get_interface(sess->eap); 339 sess->eap_if->eapRestart = TRUE; 340 sess->eap_if->portEnabled = TRUE; 341 342 RADIUS_DEBUG("New session 0x%x initialized", sess->sess_id); 343 344 return sess; 345 } 346 347 348 static struct radius_msg * 349 radius_server_encapsulate_eap(struct radius_server_data *data, 350 struct radius_client *client, 351 struct radius_session *sess, 352 struct radius_msg *request) 353 { 354 struct radius_msg *msg; 355 int code; 356 unsigned int sess_id; 357 358 if (sess->eap_if->eapFail) { 359 sess->eap_if->eapFail = FALSE; 360 code = RADIUS_CODE_ACCESS_REJECT; 361 } else if (sess->eap_if->eapSuccess) { 362 sess->eap_if->eapSuccess = FALSE; 363 code = RADIUS_CODE_ACCESS_ACCEPT; 364 } else { 365 sess->eap_if->eapReq = FALSE; 366 code = RADIUS_CODE_ACCESS_CHALLENGE; 367 } 368 369 msg = radius_msg_new(code, request->hdr->identifier); 370 if (msg == NULL) { 371 RADIUS_DEBUG("Failed to allocate reply message"); 372 return NULL; 373 } 374 375 sess_id = htonl(sess->sess_id); 376 if (code == RADIUS_CODE_ACCESS_CHALLENGE && 377 !radius_msg_add_attr(msg, RADIUS_ATTR_STATE, 378 (u8 *) &sess_id, sizeof(sess_id))) { 379 RADIUS_DEBUG("Failed to add State attribute"); 380 } 381 382 if (sess->eap_if->eapReqData && 383 !radius_msg_add_eap(msg, wpabuf_head(sess->eap_if->eapReqData), 384 wpabuf_len(sess->eap_if->eapReqData))) { 385 RADIUS_DEBUG("Failed to add EAP-Message attribute"); 386 } 387 388 if (code == RADIUS_CODE_ACCESS_ACCEPT && sess->eap_if->eapKeyData) { 389 int len; 390 if (sess->eap_if->eapKeyDataLen > 64) { 391 len = 32; 392 } else { 393 len = sess->eap_if->eapKeyDataLen / 2; 394 } 395 if (!radius_msg_add_mppe_keys(msg, request->hdr->authenticator, 396 (u8 *) client->shared_secret, 397 client->shared_secret_len, 398 sess->eap_if->eapKeyData + len, 399 len, sess->eap_if->eapKeyData, 400 len)) { 401 RADIUS_DEBUG("Failed to add MPPE key attributes"); 402 } 403 } 404 405 if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) { 406 RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)"); 407 radius_msg_free(msg); 408 os_free(msg); 409 return NULL; 410 } 411 412 if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret, 413 client->shared_secret_len, 414 request->hdr->authenticator) < 0) { 415 RADIUS_DEBUG("Failed to add Message-Authenticator attribute"); 416 } 417 418 return msg; 419 } 420 421 422 static int radius_server_reject(struct radius_server_data *data, 423 struct radius_client *client, 424 struct radius_msg *request, 425 struct sockaddr *from, socklen_t fromlen, 426 const char *from_addr, int from_port) 427 { 428 struct radius_msg *msg; 429 int ret = 0; 430 struct eap_hdr eapfail; 431 432 RADIUS_DEBUG("Reject invalid request from %s:%d", 433 from_addr, from_port); 434 435 msg = radius_msg_new(RADIUS_CODE_ACCESS_REJECT, 436 request->hdr->identifier); 437 if (msg == NULL) { 438 return -1; 439 } 440 441 os_memset(&eapfail, 0, sizeof(eapfail)); 442 eapfail.code = EAP_CODE_FAILURE; 443 eapfail.identifier = 0; 444 eapfail.length = host_to_be16(sizeof(eapfail)); 445 446 if (!radius_msg_add_eap(msg, (u8 *) &eapfail, sizeof(eapfail))) { 447 RADIUS_DEBUG("Failed to add EAP-Message attribute"); 448 } 449 450 if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) { 451 RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)"); 452 radius_msg_free(msg); 453 os_free(msg); 454 return -1; 455 } 456 457 if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret, 458 client->shared_secret_len, 459 request->hdr->authenticator) < 0) { 460 RADIUS_DEBUG("Failed to add Message-Authenticator attribute"); 461 } 462 463 if (wpa_debug_level <= MSG_MSGDUMP) { 464 radius_msg_dump(msg); 465 } 466 467 data->counters.access_rejects++; 468 client->counters.access_rejects++; 469 if (sendto(data->auth_sock, msg->buf, msg->buf_used, 0, 470 (struct sockaddr *) from, sizeof(*from)) < 0) { 471 perror("sendto[RADIUS SRV]"); 472 ret = -1; 473 } 474 475 radius_msg_free(msg); 476 os_free(msg); 477 478 return ret; 479 } 480 481 482 static int radius_server_request(struct radius_server_data *data, 483 struct radius_msg *msg, 484 struct sockaddr *from, socklen_t fromlen, 485 struct radius_client *client, 486 const char *from_addr, int from_port, 487 struct radius_session *force_sess) 488 { 489 u8 *eap = NULL; 490 size_t eap_len; 491 int res, state_included = 0; 492 u8 statebuf[4]; 493 unsigned int state; 494 struct radius_session *sess; 495 struct radius_msg *reply; 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 reply = radius_server_encapsulate_eap(data, client, sess, msg); 607 608 if (reply) { 609 RADIUS_DEBUG("Reply to %s:%d", from_addr, from_port); 610 if (wpa_debug_level <= MSG_MSGDUMP) { 611 radius_msg_dump(reply); 612 } 613 614 switch (reply->hdr->code) { 615 case RADIUS_CODE_ACCESS_ACCEPT: 616 data->counters.access_accepts++; 617 client->counters.access_accepts++; 618 break; 619 case RADIUS_CODE_ACCESS_REJECT: 620 data->counters.access_rejects++; 621 client->counters.access_rejects++; 622 break; 623 case RADIUS_CODE_ACCESS_CHALLENGE: 624 data->counters.access_challenges++; 625 client->counters.access_challenges++; 626 break; 627 } 628 res = sendto(data->auth_sock, reply->buf, reply->buf_used, 0, 629 (struct sockaddr *) from, fromlen); 630 if (res < 0) { 631 perror("sendto[RADIUS SRV]"); 632 } 633 if (sess->last_reply) { 634 radius_msg_free(sess->last_reply); 635 os_free(sess->last_reply); 636 } 637 sess->last_reply = reply; 638 sess->last_from_port = from_port; 639 sess->last_identifier = msg->hdr->identifier; 640 os_memcpy(sess->last_authenticator, msg->hdr->authenticator, 641 16); 642 } else { 643 data->counters.packets_dropped++; 644 client->counters.packets_dropped++; 645 } 646 647 if (sess->eap_if->eapSuccess || sess->eap_if->eapFail) { 648 RADIUS_DEBUG("Removing completed session 0x%x after timeout", 649 sess->sess_id); 650 eloop_cancel_timeout(radius_server_session_remove_timeout, 651 data, sess); 652 eloop_register_timeout(10, 0, 653 radius_server_session_remove_timeout, 654 data, sess); 655 } 656 657 return 0; 658 } 659 660 661 static void radius_server_receive_auth(int sock, void *eloop_ctx, 662 void *sock_ctx) 663 { 664 struct radius_server_data *data = eloop_ctx; 665 u8 *buf = NULL; 666 struct sockaddr_storage from; 667 socklen_t fromlen; 668 int len; 669 struct radius_client *client = NULL; 670 struct radius_msg *msg = NULL; 671 char abuf[50]; 672 int from_port = 0; 673 674 buf = os_malloc(RADIUS_MAX_MSG_LEN); 675 if (buf == NULL) { 676 goto fail; 677 } 678 679 fromlen = sizeof(from); 680 len = recvfrom(sock, buf, RADIUS_MAX_MSG_LEN, 0, 681 (struct sockaddr *) &from, &fromlen); 682 if (len < 0) { 683 perror("recvfrom[radius_server]"); 684 goto fail; 685 } 686 687 #ifdef CONFIG_IPV6 688 if (data->ipv6) { 689 struct sockaddr_in6 *from6 = (struct sockaddr_in6 *) &from; 690 if (inet_ntop(AF_INET6, &from6->sin6_addr, abuf, sizeof(abuf)) 691 == NULL) 692 abuf[0] = '\0'; 693 from_port = ntohs(from6->sin6_port); 694 RADIUS_DEBUG("Received %d bytes from %s:%d", 695 len, abuf, from_port); 696 697 client = radius_server_get_client(data, 698 (struct in_addr *) 699 &from6->sin6_addr, 1); 700 } 701 #endif /* CONFIG_IPV6 */ 702 703 if (!data->ipv6) { 704 struct sockaddr_in *from4 = (struct sockaddr_in *) &from; 705 os_strlcpy(abuf, inet_ntoa(from4->sin_addr), sizeof(abuf)); 706 from_port = ntohs(from4->sin_port); 707 RADIUS_DEBUG("Received %d bytes from %s:%d", 708 len, abuf, from_port); 709 710 client = radius_server_get_client(data, &from4->sin_addr, 0); 711 } 712 713 RADIUS_DUMP("Received data", buf, len); 714 715 if (client == NULL) { 716 RADIUS_DEBUG("Unknown client %s - packet ignored", abuf); 717 data->counters.invalid_requests++; 718 goto fail; 719 } 720 721 msg = radius_msg_parse(buf, len); 722 if (msg == NULL) { 723 RADIUS_DEBUG("Parsing incoming RADIUS frame failed"); 724 data->counters.malformed_access_requests++; 725 client->counters.malformed_access_requests++; 726 goto fail; 727 } 728 729 os_free(buf); 730 buf = NULL; 731 732 if (wpa_debug_level <= MSG_MSGDUMP) { 733 radius_msg_dump(msg); 734 } 735 736 if (msg->hdr->code != RADIUS_CODE_ACCESS_REQUEST) { 737 RADIUS_DEBUG("Unexpected RADIUS code %d", msg->hdr->code); 738 data->counters.unknown_types++; 739 client->counters.unknown_types++; 740 goto fail; 741 } 742 743 data->counters.access_requests++; 744 client->counters.access_requests++; 745 746 if (radius_msg_verify_msg_auth(msg, (u8 *) client->shared_secret, 747 client->shared_secret_len, NULL)) { 748 RADIUS_DEBUG("Invalid Message-Authenticator from %s", abuf); 749 data->counters.bad_authenticators++; 750 client->counters.bad_authenticators++; 751 goto fail; 752 } 753 754 if (radius_server_request(data, msg, (struct sockaddr *) &from, 755 fromlen, client, abuf, from_port, NULL) == 756 -2) 757 return; /* msg was stored with the session */ 758 759 fail: 760 if (msg) { 761 radius_msg_free(msg); 762 os_free(msg); 763 } 764 os_free(buf); 765 } 766 767 768 static int radius_server_open_socket(int port) 769 { 770 int s; 771 struct sockaddr_in addr; 772 773 s = socket(PF_INET, SOCK_DGRAM, 0); 774 if (s < 0) { 775 perror("socket"); 776 return -1; 777 } 778 779 os_memset(&addr, 0, sizeof(addr)); 780 addr.sin_family = AF_INET; 781 addr.sin_port = htons(port); 782 if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) { 783 perror("bind"); 784 close(s); 785 return -1; 786 } 787 788 return s; 789 } 790 791 792 #ifdef CONFIG_IPV6 793 static int radius_server_open_socket6(int port) 794 { 795 int s; 796 struct sockaddr_in6 addr; 797 798 s = socket(PF_INET6, SOCK_DGRAM, 0); 799 if (s < 0) { 800 perror("socket[IPv6]"); 801 return -1; 802 } 803 804 os_memset(&addr, 0, sizeof(addr)); 805 addr.sin6_family = AF_INET6; 806 os_memcpy(&addr.sin6_addr, &in6addr_any, sizeof(in6addr_any)); 807 addr.sin6_port = htons(port); 808 if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) { 809 perror("bind"); 810 close(s); 811 return -1; 812 } 813 814 return s; 815 } 816 #endif /* CONFIG_IPV6 */ 817 818 819 static void radius_server_free_sessions(struct radius_server_data *data, 820 struct radius_session *sessions) 821 { 822 struct radius_session *session, *prev; 823 824 session = sessions; 825 while (session) { 826 prev = session; 827 session = session->next; 828 radius_server_session_free(data, prev); 829 } 830 } 831 832 833 static void radius_server_free_clients(struct radius_server_data *data, 834 struct radius_client *clients) 835 { 836 struct radius_client *client, *prev; 837 838 client = clients; 839 while (client) { 840 prev = client; 841 client = client->next; 842 843 radius_server_free_sessions(data, prev->sessions); 844 os_free(prev->shared_secret); 845 os_free(prev); 846 } 847 } 848 849 850 static struct radius_client * 851 radius_server_read_clients(const char *client_file, int ipv6) 852 { 853 FILE *f; 854 const int buf_size = 1024; 855 char *buf, *pos; 856 struct radius_client *clients, *tail, *entry; 857 int line = 0, mask, failed = 0, i; 858 struct in_addr addr; 859 #ifdef CONFIG_IPV6 860 struct in6_addr addr6; 861 #endif /* CONFIG_IPV6 */ 862 unsigned int val; 863 864 f = fopen(client_file, "r"); 865 if (f == NULL) { 866 RADIUS_ERROR("Could not open client file '%s'", client_file); 867 return NULL; 868 } 869 870 buf = os_malloc(buf_size); 871 if (buf == NULL) { 872 fclose(f); 873 return NULL; 874 } 875 876 clients = tail = NULL; 877 while (fgets(buf, buf_size, f)) { 878 /* Configuration file format: 879 * 192.168.1.0/24 secret 880 * 192.168.1.2 secret 881 * fe80::211:22ff:fe33:4455/64 secretipv6 882 */ 883 line++; 884 buf[buf_size - 1] = '\0'; 885 pos = buf; 886 while (*pos != '\0' && *pos != '\n') 887 pos++; 888 if (*pos == '\n') 889 *pos = '\0'; 890 if (*buf == '\0' || *buf == '#') 891 continue; 892 893 pos = buf; 894 while ((*pos >= '0' && *pos <= '9') || *pos == '.' || 895 (*pos >= 'a' && *pos <= 'f') || *pos == ':' || 896 (*pos >= 'A' && *pos <= 'F')) { 897 pos++; 898 } 899 900 if (*pos == '\0') { 901 failed = 1; 902 break; 903 } 904 905 if (*pos == '/') { 906 char *end; 907 *pos++ = '\0'; 908 mask = strtol(pos, &end, 10); 909 if ((pos == end) || 910 (mask < 0 || mask > (ipv6 ? 128 : 32))) { 911 failed = 1; 912 break; 913 } 914 pos = end; 915 } else { 916 mask = ipv6 ? 128 : 32; 917 *pos++ = '\0'; 918 } 919 920 if (!ipv6 && inet_aton(buf, &addr) == 0) { 921 failed = 1; 922 break; 923 } 924 #ifdef CONFIG_IPV6 925 if (ipv6 && inet_pton(AF_INET6, buf, &addr6) <= 0) { 926 if (inet_pton(AF_INET, buf, &addr) <= 0) { 927 failed = 1; 928 break; 929 } 930 /* Convert IPv4 address to IPv6 */ 931 if (mask <= 32) 932 mask += (128 - 32); 933 os_memset(addr6.s6_addr, 0, 10); 934 addr6.s6_addr[10] = 0xff; 935 addr6.s6_addr[11] = 0xff; 936 os_memcpy(addr6.s6_addr + 12, (char *) &addr.s_addr, 937 4); 938 } 939 #endif /* CONFIG_IPV6 */ 940 941 while (*pos == ' ' || *pos == '\t') { 942 pos++; 943 } 944 945 if (*pos == '\0') { 946 failed = 1; 947 break; 948 } 949 950 entry = os_zalloc(sizeof(*entry)); 951 if (entry == NULL) { 952 failed = 1; 953 break; 954 } 955 entry->shared_secret = os_strdup(pos); 956 if (entry->shared_secret == NULL) { 957 failed = 1; 958 os_free(entry); 959 break; 960 } 961 entry->shared_secret_len = os_strlen(entry->shared_secret); 962 entry->addr.s_addr = addr.s_addr; 963 if (!ipv6) { 964 val = 0; 965 for (i = 0; i < mask; i++) 966 val |= 1 << (31 - i); 967 entry->mask.s_addr = htonl(val); 968 } 969 #ifdef CONFIG_IPV6 970 if (ipv6) { 971 int offset = mask / 8; 972 973 os_memcpy(entry->addr6.s6_addr, addr6.s6_addr, 16); 974 os_memset(entry->mask6.s6_addr, 0xff, offset); 975 val = 0; 976 for (i = 0; i < (mask % 8); i++) 977 val |= 1 << (7 - i); 978 if (offset < 16) 979 entry->mask6.s6_addr[offset] = val; 980 } 981 #endif /* CONFIG_IPV6 */ 982 983 if (tail == NULL) { 984 clients = tail = entry; 985 } else { 986 tail->next = entry; 987 tail = entry; 988 } 989 } 990 991 if (failed) { 992 RADIUS_ERROR("Invalid line %d in '%s'", line, client_file); 993 radius_server_free_clients(NULL, clients); 994 clients = NULL; 995 } 996 997 os_free(buf); 998 fclose(f); 999 1000 return clients; 1001 } 1002 1003 1004 struct radius_server_data * 1005 radius_server_init(struct radius_server_conf *conf) 1006 { 1007 struct radius_server_data *data; 1008 1009 #ifndef CONFIG_IPV6 1010 if (conf->ipv6) { 1011 fprintf(stderr, "RADIUS server compiled without IPv6 " 1012 "support.\n"); 1013 return NULL; 1014 } 1015 #endif /* CONFIG_IPV6 */ 1016 1017 data = os_zalloc(sizeof(*data)); 1018 if (data == NULL) 1019 return NULL; 1020 1021 os_get_time(&data->start_time); 1022 data->conf_ctx = conf->conf_ctx; 1023 data->eap_sim_db_priv = conf->eap_sim_db_priv; 1024 data->ssl_ctx = conf->ssl_ctx; 1025 data->ipv6 = conf->ipv6; 1026 if (conf->pac_opaque_encr_key) { 1027 data->pac_opaque_encr_key = os_malloc(16); 1028 os_memcpy(data->pac_opaque_encr_key, conf->pac_opaque_encr_key, 1029 16); 1030 } 1031 if (conf->eap_fast_a_id) { 1032 data->eap_fast_a_id = os_malloc(conf->eap_fast_a_id_len); 1033 if (data->eap_fast_a_id) { 1034 os_memcpy(data->eap_fast_a_id, conf->eap_fast_a_id, 1035 conf->eap_fast_a_id_len); 1036 data->eap_fast_a_id_len = conf->eap_fast_a_id_len; 1037 } 1038 } 1039 if (conf->eap_fast_a_id_info) 1040 data->eap_fast_a_id_info = os_strdup(conf->eap_fast_a_id_info); 1041 data->eap_fast_prov = conf->eap_fast_prov; 1042 data->pac_key_lifetime = conf->pac_key_lifetime; 1043 data->pac_key_refresh_time = conf->pac_key_refresh_time; 1044 data->get_eap_user = conf->get_eap_user; 1045 data->eap_sim_aka_result_ind = conf->eap_sim_aka_result_ind; 1046 data->tnc = conf->tnc; 1047 data->wps = conf->wps; 1048 if (conf->eap_req_id_text) { 1049 data->eap_req_id_text = os_malloc(conf->eap_req_id_text_len); 1050 if (data->eap_req_id_text) { 1051 os_memcpy(data->eap_req_id_text, conf->eap_req_id_text, 1052 conf->eap_req_id_text_len); 1053 data->eap_req_id_text_len = conf->eap_req_id_text_len; 1054 } 1055 } 1056 1057 data->clients = radius_server_read_clients(conf->client_file, 1058 conf->ipv6); 1059 if (data->clients == NULL) { 1060 printf("No RADIUS clients configured.\n"); 1061 radius_server_deinit(data); 1062 return NULL; 1063 } 1064 1065 #ifdef CONFIG_IPV6 1066 if (conf->ipv6) 1067 data->auth_sock = radius_server_open_socket6(conf->auth_port); 1068 else 1069 #endif /* CONFIG_IPV6 */ 1070 data->auth_sock = radius_server_open_socket(conf->auth_port); 1071 if (data->auth_sock < 0) { 1072 printf("Failed to open UDP socket for RADIUS authentication " 1073 "server\n"); 1074 radius_server_deinit(data); 1075 return NULL; 1076 } 1077 if (eloop_register_read_sock(data->auth_sock, 1078 radius_server_receive_auth, 1079 data, NULL)) { 1080 radius_server_deinit(data); 1081 return NULL; 1082 } 1083 1084 return data; 1085 } 1086 1087 1088 void radius_server_deinit(struct radius_server_data *data) 1089 { 1090 if (data == NULL) 1091 return; 1092 1093 if (data->auth_sock >= 0) { 1094 eloop_unregister_read_sock(data->auth_sock); 1095 close(data->auth_sock); 1096 } 1097 1098 radius_server_free_clients(data, data->clients); 1099 1100 os_free(data->pac_opaque_encr_key); 1101 os_free(data->eap_fast_a_id); 1102 os_free(data->eap_fast_a_id_info); 1103 os_free(data->eap_req_id_text); 1104 os_free(data); 1105 } 1106 1107 1108 int radius_server_get_mib(struct radius_server_data *data, char *buf, 1109 size_t buflen) 1110 { 1111 int ret, uptime; 1112 unsigned int idx; 1113 char *end, *pos; 1114 struct os_time now; 1115 struct radius_client *cli; 1116 1117 /* RFC 2619 - RADIUS Authentication Server MIB */ 1118 1119 if (data == NULL || buflen == 0) 1120 return 0; 1121 1122 pos = buf; 1123 end = buf + buflen; 1124 1125 os_get_time(&now); 1126 uptime = (now.sec - data->start_time.sec) * 100 + 1127 ((now.usec - data->start_time.usec) / 10000) % 100; 1128 ret = os_snprintf(pos, end - pos, 1129 "RADIUS-AUTH-SERVER-MIB\n" 1130 "radiusAuthServIdent=hostapd\n" 1131 "radiusAuthServUpTime=%d\n" 1132 "radiusAuthServResetTime=0\n" 1133 "radiusAuthServConfigReset=4\n", 1134 uptime); 1135 if (ret < 0 || ret >= end - pos) { 1136 *pos = '\0'; 1137 return pos - buf; 1138 } 1139 pos += ret; 1140 1141 ret = os_snprintf(pos, end - pos, 1142 "radiusAuthServTotalAccessRequests=%u\n" 1143 "radiusAuthServTotalInvalidRequests=%u\n" 1144 "radiusAuthServTotalDupAccessRequests=%u\n" 1145 "radiusAuthServTotalAccessAccepts=%u\n" 1146 "radiusAuthServTotalAccessRejects=%u\n" 1147 "radiusAuthServTotalAccessChallenges=%u\n" 1148 "radiusAuthServTotalMalformedAccessRequests=%u\n" 1149 "radiusAuthServTotalBadAuthenticators=%u\n" 1150 "radiusAuthServTotalPacketsDropped=%u\n" 1151 "radiusAuthServTotalUnknownTypes=%u\n", 1152 data->counters.access_requests, 1153 data->counters.invalid_requests, 1154 data->counters.dup_access_requests, 1155 data->counters.access_accepts, 1156 data->counters.access_rejects, 1157 data->counters.access_challenges, 1158 data->counters.malformed_access_requests, 1159 data->counters.bad_authenticators, 1160 data->counters.packets_dropped, 1161 data->counters.unknown_types); 1162 if (ret < 0 || ret >= end - pos) { 1163 *pos = '\0'; 1164 return pos - buf; 1165 } 1166 pos += ret; 1167 1168 for (cli = data->clients, idx = 0; cli; cli = cli->next, idx++) { 1169 char abuf[50], mbuf[50]; 1170 #ifdef CONFIG_IPV6 1171 if (data->ipv6) { 1172 if (inet_ntop(AF_INET6, &cli->addr6, abuf, 1173 sizeof(abuf)) == NULL) 1174 abuf[0] = '\0'; 1175 if (inet_ntop(AF_INET6, &cli->mask6, abuf, 1176 sizeof(mbuf)) == NULL) 1177 mbuf[0] = '\0'; 1178 } 1179 #endif /* CONFIG_IPV6 */ 1180 if (!data->ipv6) { 1181 os_strlcpy(abuf, inet_ntoa(cli->addr), sizeof(abuf)); 1182 os_strlcpy(mbuf, inet_ntoa(cli->mask), sizeof(mbuf)); 1183 } 1184 1185 ret = os_snprintf(pos, end - pos, 1186 "radiusAuthClientIndex=%u\n" 1187 "radiusAuthClientAddress=%s/%s\n" 1188 "radiusAuthServAccessRequests=%u\n" 1189 "radiusAuthServDupAccessRequests=%u\n" 1190 "radiusAuthServAccessAccepts=%u\n" 1191 "radiusAuthServAccessRejects=%u\n" 1192 "radiusAuthServAccessChallenges=%u\n" 1193 "radiusAuthServMalformedAccessRequests=%u\n" 1194 "radiusAuthServBadAuthenticators=%u\n" 1195 "radiusAuthServPacketsDropped=%u\n" 1196 "radiusAuthServUnknownTypes=%u\n", 1197 idx, 1198 abuf, mbuf, 1199 cli->counters.access_requests, 1200 cli->counters.dup_access_requests, 1201 cli->counters.access_accepts, 1202 cli->counters.access_rejects, 1203 cli->counters.access_challenges, 1204 cli->counters.malformed_access_requests, 1205 cli->counters.bad_authenticators, 1206 cli->counters.packets_dropped, 1207 cli->counters.unknown_types); 1208 if (ret < 0 || ret >= end - pos) { 1209 *pos = '\0'; 1210 return pos - buf; 1211 } 1212 pos += ret; 1213 } 1214 1215 return pos - buf; 1216 } 1217 1218 1219 static int radius_server_get_eap_user(void *ctx, const u8 *identity, 1220 size_t identity_len, int phase2, 1221 struct eap_user *user) 1222 { 1223 struct radius_session *sess = ctx; 1224 struct radius_server_data *data = sess->server; 1225 1226 return data->get_eap_user(data->conf_ctx, identity, identity_len, 1227 phase2, user); 1228 } 1229 1230 1231 static const char * radius_server_get_eap_req_id_text(void *ctx, size_t *len) 1232 { 1233 struct radius_session *sess = ctx; 1234 struct radius_server_data *data = sess->server; 1235 *len = data->eap_req_id_text_len; 1236 return data->eap_req_id_text; 1237 } 1238 1239 1240 static struct eapol_callbacks radius_server_eapol_cb = 1241 { 1242 .get_eap_user = radius_server_get_eap_user, 1243 .get_eap_req_id_text = radius_server_get_eap_req_id_text, 1244 }; 1245 1246 1247 void radius_server_eap_pending_cb(struct radius_server_data *data, void *ctx) 1248 { 1249 struct radius_client *cli; 1250 struct radius_session *s, *sess = NULL; 1251 struct radius_msg *msg; 1252 1253 if (data == NULL) 1254 return; 1255 1256 for (cli = data->clients; cli; cli = cli->next) { 1257 for (s = cli->sessions; s; s = s->next) { 1258 if (s->eap == ctx && s->last_msg) { 1259 sess = s; 1260 break; 1261 } 1262 if (sess) 1263 break; 1264 } 1265 if (sess) 1266 break; 1267 } 1268 1269 if (sess == NULL) { 1270 RADIUS_DEBUG("No session matched callback ctx"); 1271 return; 1272 } 1273 1274 msg = sess->last_msg; 1275 sess->last_msg = NULL; 1276 eap_sm_pending_cb(sess->eap); 1277 if (radius_server_request(data, msg, 1278 (struct sockaddr *) &sess->last_from, 1279 sess->last_fromlen, cli, 1280 sess->last_from_addr, 1281 sess->last_from_port, sess) == -2) 1282 return; /* msg was stored with the session */ 1283 1284 radius_msg_free(msg); 1285 os_free(msg); 1286 } 1287