src/radius/radius_server.c

   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         int ipv6;
  97         struct os_time start_time;
  98         struct radius_server_counters counters;
  99         int (*get_eap_user)(void *ctx, const u8 *identity, size_t identity_len,
 100                             int phase2, struct eap_user *user);
 101 };
 102
 103
 104 extern int wpa_debug_level;
 105
 106 #define RADIUS_DEBUG(args...) \
 107 wpa_printf(MSG_DEBUG, "RADIUS SRV: " args)
 108 #define RADIUS_ERROR(args...) \
 109 wpa_printf(MSG_ERROR, "RADIUS SRV: " args)
 110 #define RADIUS_DUMP(args...) \
 111 wpa_hexdump(MSG_MSGDUMP, "RADIUS SRV: " args)
 112 #define RADIUS_DUMP_ASCII(args...) \
 113 wpa_hexdump_ascii(MSG_MSGDUMP, "RADIUS SRV: " args)
 114
 115
 116 static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx);
 117
 118
 119
 120 static struct radius_client *
 121 radius_server_get_client(struct radius_server_data *data, struct in_addr *addr,
 122                          int ipv6)
 123 {
 124         struct radius_client *client = data->clients;
 125
 126         while (client) {
 127 #ifdef CONFIG_IPV6
 128                 if (ipv6) {
 129                         struct in6_addr *addr6;
 130                         int i;
 131
 132                         addr6 = (struct in6_addr *) addr;
 133                         for (i = 0; i < 16; i++) {
 134                                 if ((addr6->s6_addr[i] &
 135                                      client->mask6.s6_addr[i]) !=
 136                                     (client->addr6.s6_addr[i] &
 137                                      client->mask6.s6_addr[i])) {
 138                                         i = 17;
 139                                         break;
 140                                 }
 141                         }
 142                         if (i == 16) {
 143                                 break;
 144                         }
 145                 }
 146 #endif /* CONFIG_IPV6 */
 147                 if (!ipv6 && (client->addr.s_addr & client->mask.s_addr) ==
 148                     (addr->s_addr & client->mask.s_addr)) {
 149                         break;
 150                 }
 151
 152                 client = client->next;
 153         }
 154
 155         return client;
 156 }
 157
 158
 159 static struct radius_session *
 160 radius_server_get_session(struct radius_client *client, unsigned int sess_id)
 161 {
 162         struct radius_session *sess = client->sessions;
 163
 164         while (sess) {
 165                 if (sess->sess_id == sess_id) {
 166                         break;
 167                 }
 168                 sess = sess->next;
 169         }
 170
 171         return sess;
 172 }
 173
 174
 175 static void radius_server_session_free(struct radius_server_data *data,
 176                                        struct radius_session *sess)
 177 {
 178         eloop_cancel_timeout(radius_server_session_timeout, data, sess);
 179         eap_server_sm_deinit(sess->eap);
 180         if (sess->last_msg) {
 181                 radius_msg_free(sess->last_msg);
 182                 os_free(sess->last_msg);
 183         }
 184         os_free(sess->last_from_addr);
 185         if (sess->last_reply) {
 186                 radius_msg_free(sess->last_reply);
 187                 os_free(sess->last_reply);
 188         }
 189         os_free(sess);
 190         data->num_sess--;
 191 }
 192
 193
 194 static void radius_server_session_remove_timeout(void *eloop_ctx,
 195                                                  void *timeout_ctx);
 196
 197 static void radius_server_session_remove(struct radius_server_data *data,
 198                                          struct radius_session *sess)
 199 {
 200         struct radius_client *client = sess->client;
 201         struct radius_session *session, *prev;
 202
 203         eloop_cancel_timeout(radius_server_session_remove_timeout, data, sess);
 204
 205         prev = NULL;
 206         session = client->sessions;
 207         while (session) {
 208                 if (session == sess) {
 209                         if (prev == NULL) {
 210                                 client->sessions = sess->next;
 211                         } else {
 212                                 prev->next = sess->next;
 213                         }
 214                         radius_server_session_free(data, sess);
 215                         break;
 216                 }
 217                 prev = session;
 218                 session = session->next;
 219         }
 220 }
 221
 222
 223 static void radius_server_session_remove_timeout(void *eloop_ctx,
 224                                                  void *timeout_ctx)
 225 {
 226         struct radius_server_data *data = eloop_ctx;
 227         struct radius_session *sess = timeout_ctx;
 228         RADIUS_DEBUG("Removing completed session 0x%x", sess->sess_id);
 229         radius_server_session_remove(data, sess);
 230 }
 231
 232
 233 static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx)
 234 {
 235         struct radius_server_data *data = eloop_ctx;
 236         struct radius_session *sess = timeout_ctx;
 237
 238         RADIUS_DEBUG("Timing out authentication session 0x%x", sess->sess_id);
 239         radius_server_session_remove(data, sess);
 240 }
 241
 242
 243 static struct radius_session *
 244 radius_server_new_session(struct radius_server_data *data,
 245                           struct radius_client *client)
 246 {
 247         struct radius_session *sess;
 248
 249         if (data->num_sess >= RADIUS_MAX_SESSION) {
 250                 RADIUS_DEBUG("Maximum number of existing session - no room "
 251                              "for a new session");
 252                 return NULL;
 253         }
 254
 255         sess = os_zalloc(sizeof(*sess));
 256         if (sess == NULL)
 257                 return NULL;
 258
 259         sess->server = data;
 260         sess->client = client;
 261         sess->sess_id = data->next_sess_id++;
 262         sess->next = client->sessions;
 263         client->sessions = sess;
 264         eloop_register_timeout(RADIUS_SESSION_TIMEOUT, 0,
 265                                radius_server_session_timeout, data, sess);
 266         data->num_sess++;
 267         return sess;
 268 }
 269
 270
 271 static struct radius_session *
 272 radius_server_get_new_session(struct radius_server_data *data,
 273                               struct radius_client *client,
 274                               struct radius_msg *msg)
 275 {
 276         u8 *user;
 277         size_t user_len;
 278         int res;
 279         struct radius_session *sess;
 280         struct eap_config eap_conf;
 281
 282         RADIUS_DEBUG("Creating a new session");
 283
 284         user = os_malloc(256);
 285         if (user == NULL) {
 286                 return NULL;
 287         }
 288         res = radius_msg_get_attr(msg, RADIUS_ATTR_USER_NAME, user, 256);
 289         if (res < 0 || res > 256) {
 290                 RADIUS_DEBUG("Could not get User-Name");
 291                 os_free(user);
 292                 return NULL;
 293         }
 294         user_len = res;
 295         RADIUS_DUMP_ASCII("User-Name", user, user_len);
 296
 297         res = data->get_eap_user(data->conf_ctx, user, user_len, 0, NULL);
 298         os_free(user);
 299
 300         if (res == 0) {
 301                 RADIUS_DEBUG("Matching user entry found");
 302                 sess = radius_server_new_session(data, client);
 303                 if (sess == NULL) {
 304                         RADIUS_DEBUG("Failed to create a new session");
 305                         return NULL;
 306                 }
 307         } else {
 308                 RADIUS_DEBUG("User-Name not found from user database");
 309                 return NULL;
 310         }
 311
 312         os_memset(&eap_conf, 0, sizeof(eap_conf));
 313         eap_conf.ssl_ctx = data->ssl_ctx;
 314         eap_conf.eap_sim_db_priv = data->eap_sim_db_priv;
 315         eap_conf.backend_auth = TRUE;
 316         eap_conf.eap_server = 1;
 317         eap_conf.pac_opaque_encr_key = data->pac_opaque_encr_key;
 318         eap_conf.eap_fast_a_id = data->eap_fast_a_id;
 319         eap_conf.eap_fast_a_id_len = data->eap_fast_a_id_len;
 320         eap_conf.eap_fast_a_id_info = data->eap_fast_a_id_info;
 321         eap_conf.eap_fast_prov = data->eap_fast_prov;
 322         eap_conf.pac_key_lifetime = data->pac_key_lifetime;
 323         eap_conf.pac_key_refresh_time = data->pac_key_refresh_time;
 324         eap_conf.eap_sim_aka_result_ind = data->eap_sim_aka_result_ind;
 325         eap_conf.tnc = data->tnc;
 326         sess->eap = eap_server_sm_init(sess, &radius_server_eapol_cb,
 327                                        &eap_conf);
 328         if (sess->eap == NULL) {
 329                 RADIUS_DEBUG("Failed to initialize EAP state machine for the "
 330                              "new session");
 331                 radius_server_session_free(data, sess);
 332                 return NULL;
 333         }
 334         sess->eap_if = eap_get_interface(sess->eap);
 335         sess->eap_if->eapRestart = TRUE;
 336         sess->eap_if->portEnabled = TRUE;
 337
 338         RADIUS_DEBUG("New session 0x%x initialized", sess->sess_id);
 339
 340         return sess;
 341 }
 342
 343
 344 static struct radius_msg *
 345 radius_server_encapsulate_eap(struct radius_server_data *data,
 346                               struct radius_client *client,
 347                               struct radius_session *sess,
 348                               struct radius_msg *request)
 349 {
 350         struct radius_msg *msg;
 351         int code;
 352         unsigned int sess_id;
 353
 354         if (sess->eap_if->eapFail) {
 355                 sess->eap_if->eapFail = FALSE;
 356                 code = RADIUS_CODE_ACCESS_REJECT;
 357         } else if (sess->eap_if->eapSuccess) {
 358                 sess->eap_if->eapSuccess = FALSE;
 359                 code = RADIUS_CODE_ACCESS_ACCEPT;
 360         } else {
 361                 sess->eap_if->eapReq = FALSE;
 362                 code = RADIUS_CODE_ACCESS_CHALLENGE;
 363         }
 364
 365         msg = radius_msg_new(code, request->hdr->identifier);
 366         if (msg == NULL) {
 367                 RADIUS_DEBUG("Failed to allocate reply message");
 368                 return NULL;
 369         }
 370
 371         sess_id = htonl(sess->sess_id);
 372         if (code == RADIUS_CODE_ACCESS_CHALLENGE &&
 373             !radius_msg_add_attr(msg, RADIUS_ATTR_STATE,
 374                                  (u8 *) &sess_id, sizeof(sess_id))) {
 375                 RADIUS_DEBUG("Failed to add State attribute");
 376         }
 377
 378         if (sess->eap_if->eapReqData &&
 379             !radius_msg_add_eap(msg, wpabuf_head(sess->eap_if->eapReqData),
 380                                 wpabuf_len(sess->eap_if->eapReqData))) {
 381                 RADIUS_DEBUG("Failed to add EAP-Message attribute");
 382         }
 383
 384         if (code == RADIUS_CODE_ACCESS_ACCEPT && sess->eap_if->eapKeyData) {
 385                 int len;
 386                 if (sess->eap_if->eapKeyDataLen > 64) {
 387                         len = 32;
 388                 } else {
 389                         len = sess->eap_if->eapKeyDataLen / 2;
 390                 }
 391                 if (!radius_msg_add_mppe_keys(msg, request->hdr->authenticator,
 392                                               (u8 *) client->shared_secret,
 393                                               client->shared_secret_len,
 394                                               sess->eap_if->eapKeyData + len,
 395                                               len, sess->eap_if->eapKeyData,
 396                                               len)) {
 397                         RADIUS_DEBUG("Failed to add MPPE key attributes");
 398                 }
 399         }
 400
 401         if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) {
 402                 RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)");
 403                 radius_msg_free(msg);
 404                 os_free(msg);
 405                 return NULL;
 406         }
 407
 408         if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret,
 409                                   client->shared_secret_len,
 410                                   request->hdr->authenticator) < 0) {
 411                 RADIUS_DEBUG("Failed to add Message-Authenticator attribute");
 412         }
 413
 414         return msg;
 415 }
 416
 417
 418 static int radius_server_reject(struct radius_server_data *data,
 419                                 struct radius_client *client,
 420                                 struct radius_msg *request,
 421                                 struct sockaddr *from, socklen_t fromlen,
 422                                 const char *from_addr, int from_port)
 423 {
 424         struct radius_msg *msg;
 425         int ret = 0;
 426         struct eap_hdr eapfail;
 427
 428         RADIUS_DEBUG("Reject invalid request from %s:%d",
 429                      from_addr, from_port);
 430
 431         msg = radius_msg_new(RADIUS_CODE_ACCESS_REJECT,
 432                              request->hdr->identifier);
 433         if (msg == NULL) {
 434                 return -1;
 435         }
 436
 437         os_memset(&eapfail, 0, sizeof(eapfail));
 438         eapfail.code = EAP_CODE_FAILURE;
 439         eapfail.identifier = 0;
 440         eapfail.length = host_to_be16(sizeof(eapfail));
 441
 442         if (!radius_msg_add_eap(msg, (u8 *) &eapfail, sizeof(eapfail))) {
 443                 RADIUS_DEBUG("Failed to add EAP-Message attribute");
 444         }
 445
 446         if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) {
 447                 RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)");
 448                 radius_msg_free(msg);
 449                 os_free(msg);
 450                 return -1;
 451         }
 452
 453         if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret,
 454                                   client->shared_secret_len,
 455                                   request->hdr->authenticator) < 0) {
 456                 RADIUS_DEBUG("Failed to add Message-Authenticator attribute");
 457         }
 458
 459         if (wpa_debug_level <= MSG_MSGDUMP) {
 460                 radius_msg_dump(msg);
 461         }
 462
 463         data->counters.access_rejects++;
 464         client->counters.access_rejects++;
 465         if (sendto(data->auth_sock, msg->buf, msg->buf_used, 0,
 466                    (struct sockaddr *) from, sizeof(*from)) < 0) {
 467                 perror("sendto[RADIUS SRV]");
 468                 ret = -1;
 469         }
 470
 471         radius_msg_free(msg);
 472         os_free(msg);
 473
 474         return ret;
 475 }
 476
 477
 478 static int radius_server_request(struct radius_server_data *data,
 479                                  struct radius_msg *msg,
 480                                  struct sockaddr *from, socklen_t fromlen,
 481                                  struct radius_client *client,
 482                                  const char *from_addr, int from_port,
 483                                  struct radius_session *force_sess)
 484 {
 485         u8 *eap = NULL;
 486         size_t eap_len;
 487         int res, state_included = 0;
 488         u8 statebuf[4];
 489         unsigned int state;
 490         struct radius_session *sess;
 491         struct radius_msg *reply;
 492
 493         if (force_sess)
 494                 sess = force_sess;
 495         else {
 496                 res = radius_msg_get_attr(msg, RADIUS_ATTR_STATE, statebuf,
 497                                           sizeof(statebuf));
 498                 state_included = res >= 0;
 499                 if (res == sizeof(statebuf)) {
 500                         state = WPA_GET_BE32(statebuf);
 501                         sess = radius_server_get_session(client, state);
 502                 } else {
 503                         sess = NULL;
 504                 }
 505         }
 506
 507         if (sess) {
 508                 RADIUS_DEBUG("Request for session 0x%x", sess->sess_id);
 509         } else if (state_included) {
 510                 RADIUS_DEBUG("State attribute included but no session found");
 511                 radius_server_reject(data, client, msg, from, fromlen,
 512                                      from_addr, from_port);
 513                 return -1;
 514         } else {
 515                 sess = radius_server_get_new_session(data, client, msg);
 516                 if (sess == NULL) {
 517                         RADIUS_DEBUG("Could not create a new session");
 518                         radius_server_reject(data, client, msg, from, fromlen,
 519                                              from_addr, from_port);
 520                         return -1;
 521                 }
 522         }
 523
 524         if (sess->last_from_port == from_port &&
 525             sess->last_identifier == msg->hdr->identifier &&
 526             os_memcmp(sess->last_authenticator, msg->hdr->authenticator, 16) ==
 527             0) {
 528                 RADIUS_DEBUG("Duplicate message from %s", from_addr);
 529                 data->counters.dup_access_requests++;
 530                 client->counters.dup_access_requests++;
 531
 532                 if (sess->last_reply) {
 533                         res = sendto(data->auth_sock, sess->last_reply->buf,
 534                                      sess->last_reply->buf_used, 0,
 535                                      (struct sockaddr *) from, fromlen);
 536                         if (res < 0) {
 537                                 perror("sendto[RADIUS SRV]");
 538                         }
 539                         return 0;
 540                 }
 541
 542                 RADIUS_DEBUG("No previous reply available for duplicate "
 543                              "message");
 544                 return -1;
 545         }
 546
 547         eap = radius_msg_get_eap(msg, &eap_len);
 548         if (eap == NULL) {
 549                 RADIUS_DEBUG("No EAP-Message in RADIUS packet from %s",
 550                              from_addr);
 551                 data->counters.packets_dropped++;
 552                 client->counters.packets_dropped++;
 553                 return -1;
 554         }
 555
 556         RADIUS_DUMP("Received EAP data", eap, eap_len);
 557
 558         /* FIX: if Code is Request, Success, or Failure, send Access-Reject;
 559          * RFC3579 Sect. 2.6.2.
 560          * Include EAP-Response/Nak with no preferred method if
 561          * code == request.
 562          * If code is not 1-4, discard the packet silently.
 563          * Or is this already done by the EAP state machine? */
 564
 565         wpabuf_free(sess->eap_if->eapRespData);
 566         sess->eap_if->eapRespData = wpabuf_alloc_ext_data(eap, eap_len);
 567         if (sess->eap_if->eapRespData == NULL)
 568                 os_free(eap);
 569         eap = NULL;
 570         sess->eap_if->eapResp = TRUE;
 571         eap_server_sm_step(sess->eap);
 572
 573         if ((sess->eap_if->eapReq || sess->eap_if->eapSuccess ||
 574              sess->eap_if->eapFail) && sess->eap_if->eapReqData) {
 575                 RADIUS_DUMP("EAP data from the state machine",
 576                             wpabuf_head(sess->eap_if->eapReqData),
 577                             wpabuf_len(sess->eap_if->eapReqData));
 578         } else if (sess->eap_if->eapFail) {
 579                 RADIUS_DEBUG("No EAP data from the state machine, but eapFail "
 580                              "set");
 581         } else if (eap_sm_method_pending(sess->eap)) {
 582                 if (sess->last_msg) {
 583                         radius_msg_free(sess->last_msg);
 584                         os_free(sess->last_msg);
 585                 }
 586                 sess->last_msg = msg;
 587                 sess->last_from_port = from_port;
 588                 os_free(sess->last_from_addr);
 589                 sess->last_from_addr = os_strdup(from_addr);
 590                 sess->last_fromlen = fromlen;
 591                 os_memcpy(&sess->last_from, from, fromlen);
 592                 return -2;
 593         } else {
 594                 RADIUS_DEBUG("No EAP data from the state machine - ignore this"
 595                              " Access-Request silently (assuming it was a "
 596                              "duplicate)");
 597                 data->counters.packets_dropped++;
 598                 client->counters.packets_dropped++;
 599                 return -1;
 600         }
 601
 602         reply = radius_server_encapsulate_eap(data, client, sess, msg);
 603
 604         if (reply) {
 605                 RADIUS_DEBUG("Reply to %s:%d", from_addr, from_port);
 606                 if (wpa_debug_level <= MSG_MSGDUMP) {
 607                         radius_msg_dump(reply);
 608                 }
 609
 610                 switch (reply->hdr->code) {
 611                 case RADIUS_CODE_ACCESS_ACCEPT:
 612                         data->counters.access_accepts++;
 613                         client->counters.access_accepts++;
 614                         break;
 615                 case RADIUS_CODE_ACCESS_REJECT:
 616                         data->counters.access_rejects++;
 617                         client->counters.access_rejects++;
 618                         break;
 619                 case RADIUS_CODE_ACCESS_CHALLENGE:
 620                         data->counters.access_challenges++;
 621                         client->counters.access_challenges++;
 622                         break;
 623                 }
 624                 res = sendto(data->auth_sock, reply->buf, reply->buf_used, 0,
 625                              (struct sockaddr *) from, fromlen);
 626                 if (res < 0) {
 627                         perror("sendto[RADIUS SRV]");
 628                 }
 629                 if (sess->last_reply) {
 630                         radius_msg_free(sess->last_reply);
 631                         os_free(sess->last_reply);
 632                 }
 633                 sess->last_reply = reply;
 634                 sess->last_from_port = from_port;
 635                 sess->last_identifier = msg->hdr->identifier;
 636                 os_memcpy(sess->last_authenticator, msg->hdr->authenticator,
 637                           16);
 638         } else {
 639                 data->counters.packets_dropped++;
 640                 client->counters.packets_dropped++;
 641         }
 642
 643         if (sess->eap_if->eapSuccess || sess->eap_if->eapFail) {
 644                 RADIUS_DEBUG("Removing completed session 0x%x after timeout",
 645                              sess->sess_id);
 646                 eloop_cancel_timeout(radius_server_session_remove_timeout,
 647                                      data, sess);
 648                 eloop_register_timeout(10, 0,
 649                                        radius_server_session_remove_timeout,
 650                                        data, sess);
 651         }
 652
 653         return 0;
 654 }
 655
 656
 657 static void radius_server_receive_auth(int sock, void *eloop_ctx,
 658                                        void *sock_ctx)
 659 {
 660         struct radius_server_data *data = eloop_ctx;
 661         u8 *buf = NULL;
 662         struct sockaddr_storage from;
 663         socklen_t fromlen;
 664         int len;
 665         struct radius_client *client = NULL;
 666         struct radius_msg *msg = NULL;
 667         char abuf[50];
 668         int from_port = 0;
 669
 670         buf = os_malloc(RADIUS_MAX_MSG_LEN);
 671         if (buf == NULL) {
 672                 goto fail;
 673         }
 674
 675         fromlen = sizeof(from);
 676         len = recvfrom(sock, buf, RADIUS_MAX_MSG_LEN, 0,
 677                        (struct sockaddr *) &from, &fromlen);
 678         if (len < 0) {
 679                 perror("recvfrom[radius_server]");
 680                 goto fail;
 681         }
 682
 683 #ifdef CONFIG_IPV6
 684         if (data->ipv6) {
 685                 struct sockaddr_in6 *from6 = (struct sockaddr_in6 *) &from;
 686                 if (inet_ntop(AF_INET6, &from6->sin6_addr, abuf, sizeof(abuf))
 687                     == NULL)
 688                         abuf[0] = '\0';
 689                 from_port = ntohs(from6->sin6_port);
 690                 RADIUS_DEBUG("Received %d bytes from %s:%d",
 691                              len, abuf, from_port);
 692
 693                 client = radius_server_get_client(data,
 694                                                   (struct in_addr *)
 695                                                   &from6->sin6_addr, 1);
 696         }
 697 #endif /* CONFIG_IPV6 */
 698
 699         if (!data->ipv6) {
 700                 struct sockaddr_in *from4 = (struct sockaddr_in *) &from;
 701                 os_strlcpy(abuf, inet_ntoa(from4->sin_addr), sizeof(abuf));
 702                 from_port = ntohs(from4->sin_port);
 703                 RADIUS_DEBUG("Received %d bytes from %s:%d",
 704                              len, abuf, from_port);
 705
 706                 client = radius_server_get_client(data, &from4->sin_addr, 0);
 707         }
 708
 709         RADIUS_DUMP("Received data", buf, len);
 710
 711         if (client == NULL) {
 712                 RADIUS_DEBUG("Unknown client %s - packet ignored", abuf);
 713                 data->counters.invalid_requests++;
 714                 goto fail;
 715         }
 716
 717         msg = radius_msg_parse(buf, len);
 718         if (msg == NULL) {
 719                 RADIUS_DEBUG("Parsing incoming RADIUS frame failed");
 720                 data->counters.malformed_access_requests++;
 721                 client->counters.malformed_access_requests++;
 722                 goto fail;
 723         }
 724
 725         os_free(buf);
 726         buf = NULL;
 727
 728         if (wpa_debug_level <= MSG_MSGDUMP) {
 729                 radius_msg_dump(msg);
 730         }
 731
 732         if (msg->hdr->code != RADIUS_CODE_ACCESS_REQUEST) {
 733                 RADIUS_DEBUG("Unexpected RADIUS code %d", msg->hdr->code);
 734                 data->counters.unknown_types++;
 735                 client->counters.unknown_types++;
 736                 goto fail;
 737         }
 738
 739         data->counters.access_requests++;
 740         client->counters.access_requests++;
 741
 742         if (radius_msg_verify_msg_auth(msg, (u8 *) client->shared_secret,
 743                                        client->shared_secret_len, NULL)) {
 744                 RADIUS_DEBUG("Invalid Message-Authenticator from %s", abuf);
 745                 data->counters.bad_authenticators++;
 746                 client->counters.bad_authenticators++;
 747                 goto fail;
 748         }
 749
 750         if (radius_server_request(data, msg, (struct sockaddr *) &from,
 751                                   fromlen, client, abuf, from_port, NULL) ==
 752             -2)
 753                 return; /* msg was stored with the session */
 754
 755 fail:
 756         if (msg) {
 757                 radius_msg_free(msg);
 758                 os_free(msg);
 759         }
 760         os_free(buf);
 761 }
 762
 763
 764 static int radius_server_open_socket(int port)
 765 {
 766         int s;
 767         struct sockaddr_in addr;
 768
 769         s = socket(PF_INET, SOCK_DGRAM, 0);
 770         if (s < 0) {
 771                 perror("socket");
 772                 return -1;
 773         }
 774
 775         os_memset(&addr, 0, sizeof(addr));
 776         addr.sin_family = AF_INET;
 777         addr.sin_port = htons(port);
 778         if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 779                 perror("bind");
 780                 close(s);
 781                 return -1;
 782         }
 783
 784         return s;
 785 }
 786
 787
 788 #ifdef CONFIG_IPV6
 789 static int radius_server_open_socket6(int port)
 790 {
 791         int s;
 792         struct sockaddr_in6 addr;
 793
 794         s = socket(PF_INET6, SOCK_DGRAM, 0);
 795         if (s < 0) {
 796                 perror("socket[IPv6]");
 797                 return -1;
 798         }
 799
 800         os_memset(&addr, 0, sizeof(addr));
 801         addr.sin6_family = AF_INET6;
 802         os_memcpy(&addr.sin6_addr, &in6addr_any, sizeof(in6addr_any));
 803         addr.sin6_port = htons(port);
 804         if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 805                 perror("bind");
 806                 close(s);
 807                 return -1;
 808         }
 809
 810         return s;
 811 }
 812 #endif /* CONFIG_IPV6 */
 813
 814
 815 static void radius_server_free_sessions(struct radius_server_data *data,
 816                                         struct radius_session *sessions)
 817 {
 818         struct radius_session *session, *prev;
 819
 820         session = sessions;
 821         while (session) {
 822                 prev = session;
 823                 session = session->next;
 824                 radius_server_session_free(data, prev);
 825         }
 826 }
 827
 828
 829 static void radius_server_free_clients(struct radius_server_data *data,
 830                                        struct radius_client *clients)
 831 {
 832         struct radius_client *client, *prev;
 833
 834         client = clients;
 835         while (client) {
 836                 prev = client;
 837                 client = client->next;
 838
 839                 radius_server_free_sessions(data, prev->sessions);
 840                 os_free(prev->shared_secret);
 841                 os_free(prev);
 842         }
 843 }
 844
 845
 846 static struct radius_client *
 847 radius_server_read_clients(const char *client_file, int ipv6)
 848 {
 849         FILE *f;
 850         const int buf_size = 1024;
 851         char *buf, *pos;
 852         struct radius_client *clients, *tail, *entry;
 853         int line = 0, mask, failed = 0, i;
 854         struct in_addr addr;
 855 #ifdef CONFIG_IPV6
 856         struct in6_addr addr6;
 857 #endif /* CONFIG_IPV6 */
 858         unsigned int val;
 859
 860         f = fopen(client_file, "r");
 861         if (f == NULL) {
 862                 RADIUS_ERROR("Could not open client file '%s'", client_file);
 863                 return NULL;
 864         }
 865
 866         buf = os_malloc(buf_size);
 867         if (buf == NULL) {
 868                 fclose(f);
 869                 return NULL;
 870         }
 871
 872         clients = tail = NULL;
 873         while (fgets(buf, buf_size, f)) {
 874                 /* Configuration file format:
 875                  * 192.168.1.0/24 secret
 876                  * 192.168.1.2 secret
 877                  * fe80::211:22ff:fe33:4455/64 secretipv6
 878                  */
 879                 line++;
 880                 buf[buf_size - 1] = '\0';
 881                 pos = buf;
 882                 while (*pos != '\0' && *pos != '\n')
 883                         pos++;
 884                 if (*pos == '\n')
 885                         *pos = '\0';
 886                 if (*buf == '\0' || *buf == '#')
 887                         continue;
 888
 889                 pos = buf;
 890                 while ((*pos >= '0' && *pos <= '9') || *pos == '.' ||
 891                        (*pos >= 'a' && *pos <= 'f') || *pos == ':' ||
 892                        (*pos >= 'A' && *pos <= 'F')) {
 893                         pos++;
 894                 }
 895
 896                 if (*pos == '\0') {
 897                         failed = 1;
 898                         break;
 899                 }
 900
 901                 if (*pos == '/') {
 902                         char *end;
 903                         *pos++ = '\0';
 904                         mask = strtol(pos, &end, 10);
 905                         if ((pos == end) ||
 906                             (mask < 0 || mask > (ipv6 ? 128 : 32))) {
 907                                 failed = 1;
 908                                 break;
 909                         }
 910                         pos = end;
 911                 } else {
 912                         mask = ipv6 ? 128 : 32;
 913                         *pos++ = '\0';
 914                 }
 915
 916                 if (!ipv6 && inet_aton(buf, &addr) == 0) {
 917                         failed = 1;
 918                         break;
 919                 }
 920 #ifdef CONFIG_IPV6
 921                 if (ipv6 && inet_pton(AF_INET6, buf, &addr6) <= 0) {
 922                         if (inet_pton(AF_INET, buf, &addr) <= 0) {
 923                                 failed = 1;
 924                                 break;
 925                         }
 926                         /* Convert IPv4 address to IPv6 */
 927                         if (mask <= 32)
 928                                 mask += (128 - 32);
 929                         os_memset(addr6.s6_addr, 0, 10);
 930                         addr6.s6_addr[10] = 0xff;
 931                         addr6.s6_addr[11] = 0xff;
 932                         os_memcpy(addr6.s6_addr + 12, (char *) &addr.s_addr,
 933                                   4);
 934                 }
 935 #endif /* CONFIG_IPV6 */
 936
 937                 while (*pos == ' ' || *pos == '\t') {
 938                         pos++;
 939                 }
 940
 941                 if (*pos == '\0') {
 942                         failed = 1;
 943                         break;
 944                 }
 945
 946                 entry = os_zalloc(sizeof(*entry));
 947                 if (entry == NULL) {
 948                         failed = 1;
 949                         break;
 950                 }
 951                 entry->shared_secret = os_strdup(pos);
 952                 if (entry->shared_secret == NULL) {
 953                         failed = 1;
 954                         os_free(entry);
 955                         break;
 956                 }
 957                 entry->shared_secret_len = os_strlen(entry->shared_secret);
 958                 entry->addr.s_addr = addr.s_addr;
 959                 if (!ipv6) {
 960                         val = 0;
 961                         for (i = 0; i < mask; i++)
 962                                 val |= 1 << (31 - i);
 963                         entry->mask.s_addr = htonl(val);
 964                 }
 965 #ifdef CONFIG_IPV6
 966                 if (ipv6) {
 967                         int offset = mask / 8;
 968
 969                         os_memcpy(entry->addr6.s6_addr, addr6.s6_addr, 16);
 970                         os_memset(entry->mask6.s6_addr, 0xff, offset);
 971                         val = 0;
 972                         for (i = 0; i < (mask % 8); i++)
 973                                 val |= 1 << (7 - i);
 974                         if (offset < 16)
 975                                 entry->mask6.s6_addr[offset] = val;
 976                 }
 977 #endif /* CONFIG_IPV6 */
 978
 979                 if (tail == NULL) {
 980                         clients = tail = entry;
 981                 } else {
 982                         tail->next = entry;
 983                         tail = entry;
 984                 }
 985         }
 986
 987         if (failed) {
 988                 RADIUS_ERROR("Invalid line %d in '%s'", line, client_file);
 989                 radius_server_free_clients(NULL, clients);
 990                 clients = NULL;
 991         }
 992
 993         os_free(buf);
 994         fclose(f);
 995
 996         return clients;
 997 }
 998
 999
1000 struct radius_server_data *
1001 radius_server_init(struct radius_server_conf *conf)
1002 {
1003         struct radius_server_data *data;
1004
1005 #ifndef CONFIG_IPV6
1006         if (conf->ipv6) {
1007                 fprintf(stderr, "RADIUS server compiled without IPv6 "
1008                         "support.\n");
1009                 return NULL;
1010         }
1011 #endif /* CONFIG_IPV6 */
1012
1013         data = os_zalloc(sizeof(*data));
1014         if (data == NULL)
1015                 return NULL;
1016
1017         os_get_time(&data->start_time);
1018         data->conf_ctx = conf->conf_ctx;
1019         data->eap_sim_db_priv = conf->eap_sim_db_priv;
1020         data->ssl_ctx = conf->ssl_ctx;
1021         data->ipv6 = conf->ipv6;
1022         if (conf->pac_opaque_encr_key) {
1023                 data->pac_opaque_encr_key = os_malloc(16);
1024                 os_memcpy(data->pac_opaque_encr_key, conf->pac_opaque_encr_key,
1025                           16);
1026         }
1027         if (conf->eap_fast_a_id) {
1028                 data->eap_fast_a_id = os_malloc(conf->eap_fast_a_id_len);
1029                 if (data->eap_fast_a_id) {
1030                         os_memcpy(data->eap_fast_a_id, conf->eap_fast_a_id,
1031                                   conf->eap_fast_a_id_len);
1032                         data->eap_fast_a_id_len = conf->eap_fast_a_id_len;
1033                 }
1034         }
1035         if (conf->eap_fast_a_id_info)
1036                 data->eap_fast_a_id_info = os_strdup(conf->eap_fast_a_id_info);
1037         data->eap_fast_prov = conf->eap_fast_prov;
1038         data->pac_key_lifetime = conf->pac_key_lifetime;
1039         data->pac_key_refresh_time = conf->pac_key_refresh_time;
1040         data->get_eap_user = conf->get_eap_user;
1041         data->eap_sim_aka_result_ind = conf->eap_sim_aka_result_ind;
1042         data->tnc = conf->tnc;
1043
1044         data->clients = radius_server_read_clients(conf->client_file,
1045                                                    conf->ipv6);
1046         if (data->clients == NULL) {
1047                 printf("No RADIUS clients configured.\n");
1048                 radius_server_deinit(data);
1049                 return NULL;
1050         }
1051
1052 #ifdef CONFIG_IPV6
1053         if (conf->ipv6)
1054                 data->auth_sock = radius_server_open_socket6(conf->auth_port);
1055         else
1056 #endif /* CONFIG_IPV6 */
1057         data->auth_sock = radius_server_open_socket(conf->auth_port);
1058         if (data->auth_sock < 0) {
1059                 printf("Failed to open UDP socket for RADIUS authentication "
1060                        "server\n");
1061                 radius_server_deinit(data);
1062                 return NULL;
1063         }
1064         if (eloop_register_read_sock(data->auth_sock,
1065                                      radius_server_receive_auth,
1066                                      data, NULL)) {
1067                 radius_server_deinit(data);
1068                 return NULL;
1069         }
1070
1071         return data;
1072 }
1073
1074
1075 void radius_server_deinit(struct radius_server_data *data)
1076 {
1077         if (data == NULL)
1078                 return;
1079
1080         if (data->auth_sock >= 0) {
1081                 eloop_unregister_read_sock(data->auth_sock);
1082                 close(data->auth_sock);
1083         }
1084
1085         radius_server_free_clients(data, data->clients);
1086
1087         os_free(data->pac_opaque_encr_key);
1088         os_free(data->eap_fast_a_id);
1089         os_free(data->eap_fast_a_id_info);
1090         os_free(data);
1091 }
1092
1093
1094 int radius_server_get_mib(struct radius_server_data *data, char *buf,
1095                           size_t buflen)
1096 {
1097         int ret, uptime;
1098         unsigned int idx;
1099         char *end, *pos;
1100         struct os_time now;
1101         struct radius_client *cli;
1102
1103         /* RFC 2619 - RADIUS Authentication Server MIB */
1104
1105         if (data == NULL || buflen == 0)
1106                 return 0;
1107
1108         pos = buf;
1109         end = buf + buflen;
1110
1111         os_get_time(&now);
1112         uptime = (now.sec - data->start_time.sec) * 100 +
1113                 ((now.usec - data->start_time.usec) / 10000) % 100;
1114         ret = os_snprintf(pos, end - pos,
1115                           "RADIUS-AUTH-SERVER-MIB\n"
1116                           "radiusAuthServIdent=hostapd\n"
1117                           "radiusAuthServUpTime=%d\n"
1118                           "radiusAuthServResetTime=0\n"
1119                           "radiusAuthServConfigReset=4\n",
1120                           uptime);
1121         if (ret < 0 || ret >= end - pos) {
1122                 *pos = '\0';
1123                 return pos - buf;
1124         }
1125         pos += ret;
1126
1127         ret = os_snprintf(pos, end - pos,
1128                           "radiusAuthServTotalAccessRequests=%u\n"
1129                           "radiusAuthServTotalInvalidRequests=%u\n"
1130                           "radiusAuthServTotalDupAccessRequests=%u\n"
1131                           "radiusAuthServTotalAccessAccepts=%u\n"
1132                           "radiusAuthServTotalAccessRejects=%u\n"
1133                           "radiusAuthServTotalAccessChallenges=%u\n"
1134                           "radiusAuthServTotalMalformedAccessRequests=%u\n"
1135                           "radiusAuthServTotalBadAuthenticators=%u\n"
1136                           "radiusAuthServTotalPacketsDropped=%u\n"
1137                           "radiusAuthServTotalUnknownTypes=%u\n",
1138                           data->counters.access_requests,
1139                           data->counters.invalid_requests,
1140                           data->counters.dup_access_requests,
1141                           data->counters.access_accepts,
1142                           data->counters.access_rejects,
1143                           data->counters.access_challenges,
1144                           data->counters.malformed_access_requests,
1145                           data->counters.bad_authenticators,
1146                           data->counters.packets_dropped,
1147                           data->counters.unknown_types);
1148         if (ret < 0 || ret >= end - pos) {
1149                 *pos = '\0';
1150                 return pos - buf;
1151         }
1152         pos += ret;
1153
1154         for (cli = data->clients, idx = 0; cli; cli = cli->next, idx++) {
1155                 char abuf[50], mbuf[50];
1156 #ifdef CONFIG_IPV6
1157                 if (data->ipv6) {
1158                         if (inet_ntop(AF_INET6, &cli->addr6, abuf,
1159                                       sizeof(abuf)) == NULL)
1160                                 abuf[0] = '\0';
1161                         if (inet_ntop(AF_INET6, &cli->mask6, abuf,
1162                                       sizeof(mbuf)) == NULL)
1163                                 mbuf[0] = '\0';
1164                 }
1165 #endif /* CONFIG_IPV6 */
1166                 if (!data->ipv6) {
1167                         os_strlcpy(abuf, inet_ntoa(cli->addr), sizeof(abuf));
1168                         os_strlcpy(mbuf, inet_ntoa(cli->mask), sizeof(mbuf));
1169                 }
1170
1171                 ret = os_snprintf(pos, end - pos,
1172                                   "radiusAuthClientIndex=%u\n"
1173                                   "radiusAuthClientAddress=%s/%s\n"
1174                                   "radiusAuthServAccessRequests=%u\n"
1175                                   "radiusAuthServDupAccessRequests=%u\n"
1176                                   "radiusAuthServAccessAccepts=%u\n"
1177                                   "radiusAuthServAccessRejects=%u\n"
1178                                   "radiusAuthServAccessChallenges=%u\n"
1179                                   "radiusAuthServMalformedAccessRequests=%u\n"
1180                                   "radiusAuthServBadAuthenticators=%u\n"
1181                                   "radiusAuthServPacketsDropped=%u\n"
1182                                   "radiusAuthServUnknownTypes=%u\n",
1183                                   idx,
1184                                   abuf, mbuf,
1185                                   cli->counters.access_requests,
1186                                   cli->counters.dup_access_requests,
1187                                   cli->counters.access_accepts,
1188                                   cli->counters.access_rejects,
1189                                   cli->counters.access_challenges,
1190                                   cli->counters.malformed_access_requests,
1191                                   cli->counters.bad_authenticators,
1192                                   cli->counters.packets_dropped,
1193                                   cli->counters.unknown_types);
1194                 if (ret < 0 || ret >= end - pos) {
1195                         *pos = '\0';
1196                         return pos - buf;
1197                 }
1198                 pos += ret;
1199         }
1200
1201         return pos - buf;
1202 }
1203
1204
1205 static int radius_server_get_eap_user(void *ctx, const u8 *identity,
1206                                       size_t identity_len, int phase2,
1207                                       struct eap_user *user)
1208 {
1209         struct radius_session *sess = ctx;
1210         struct radius_server_data *data = sess->server;
1211
1212         return data->get_eap_user(data->conf_ctx, identity, identity_len,
1213                                   phase2, user);
1214 }
1215
1216
1217 static struct eapol_callbacks radius_server_eapol_cb =
1218 {
1219         .get_eap_user = radius_server_get_eap_user,
1220 };
1221
1222
1223 void radius_server_eap_pending_cb(struct radius_server_data *data, void *ctx)
1224 {
1225         struct radius_client *cli;
1226         struct radius_session *s, *sess = NULL;
1227         struct radius_msg *msg;
1228
1229         if (data == NULL)
1230                 return;
1231
1232         for (cli = data->clients; cli; cli = cli->next) {
1233                 for (s = cli->sessions; s; s = s->next) {
1234                         if (s->eap == ctx && s->last_msg) {
1235                                 sess = s;
1236                                 break;
1237                         }
1238                         if (sess)
1239                                 break;
1240                 }
1241                 if (sess)
1242                         break;
1243         }
1244
1245         if (sess == NULL) {
1246                 RADIUS_DEBUG("No session matched callback ctx");
1247                 return;
1248         }
1249
1250         msg = sess->last_msg;
1251         sess->last_msg = NULL;
1252         eap_sm_pending_cb(sess->eap);
1253         if (radius_server_request(data, msg,
1254                                   (struct sockaddr *) &sess->last_from,
1255                                   sess->last_fromlen, cli,
1256                                   sess->last_from_addr,
1257                                   sess->last_from_port, sess) == -2)
1258                 return; /* msg was stored with the session */
1259
1260         radius_msg_free(msg);
1261         os_free(msg);
1262 }