contrib/hostapd/radius_server.c

   1 /*
   2  * hostapd / RADIUS authentication server
   3  * Copyright (c) 2005-2006, 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 "config.h"
  22 #include "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         u8 *eapKeyData, *eapReqData;
  54         size_t eapKeyDataLen, eapReqDataLen;
  55         Boolean eapSuccess, eapRestart, eapFail, eapResp, eapReq, eapNoReq;
  56         Boolean portEnabled, eapTimeout;
  57
  58         struct radius_msg *last_msg;
  59         char *last_from_addr;
  60         int last_from_port;
  61         struct sockaddr_storage last_from;
  62         socklen_t last_fromlen;
  63         u8 last_identifier;
  64         struct radius_msg *last_reply;
  65         u8 last_authenticator[16];
  66 };
  67
  68 struct radius_client {
  69         struct radius_client *next;
  70         struct in_addr addr;
  71         struct in_addr mask;
  72 #ifdef CONFIG_IPV6
  73         struct in6_addr addr6;
  74         struct in6_addr mask6;
  75 #endif /* CONFIG_IPV6 */
  76         char *shared_secret;
  77         int shared_secret_len;
  78         struct radius_session *sessions;
  79         struct radius_server_counters counters;
  80 };
  81
  82 struct radius_server_data {
  83         int auth_sock;
  84         struct radius_client *clients;
  85         unsigned int next_sess_id;
  86         void *hostapd_conf;
  87         int num_sess;
  88         void *eap_sim_db_priv;
  89         void *ssl_ctx;
  90         int ipv6;
  91         struct os_time start_time;
  92         struct radius_server_counters counters;
  93 };
  94
  95
  96 extern int wpa_debug_level;
  97
  98 #define RADIUS_DEBUG(args...) \
  99 wpa_printf(MSG_DEBUG, "RADIUS SRV: " args)
 100 #define RADIUS_ERROR(args...) \
 101 wpa_printf(MSG_ERROR, "RADIUS SRV: " args)
 102 #define RADIUS_DUMP(args...) \
 103 wpa_hexdump(MSG_MSGDUMP, "RADIUS SRV: " args)
 104 #define RADIUS_DUMP_ASCII(args...) \
 105 wpa_hexdump_ascii(MSG_MSGDUMP, "RADIUS SRV: " args)
 106
 107
 108 static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx);
 109
 110
 111
 112 static struct radius_client *
 113 radius_server_get_client(struct radius_server_data *data, struct in_addr *addr,
 114                          int ipv6)
 115 {
 116         struct radius_client *client = data->clients;
 117
 118         while (client) {
 119 #ifdef CONFIG_IPV6
 120                 if (ipv6) {
 121                         struct in6_addr *addr6;
 122                         int i;
 123
 124                         addr6 = (struct in6_addr *) addr;
 125                         for (i = 0; i < 16; i++) {
 126                                 if ((addr6->s6_addr[i] &
 127                                      client->mask6.s6_addr[i]) !=
 128                                     (client->addr6.s6_addr[i] &
 129                                      client->mask6.s6_addr[i])) {
 130                                         i = 17;
 131                                         break;
 132                                 }
 133                         }
 134                         if (i == 16) {
 135                                 break;
 136                         }
 137                 }
 138 #endif /* CONFIG_IPV6 */
 139                 if (!ipv6 && (client->addr.s_addr & client->mask.s_addr) ==
 140                     (addr->s_addr & client->mask.s_addr)) {
 141                         break;
 142                 }
 143
 144                 client = client->next;
 145         }
 146
 147         return client;
 148 }
 149
 150
 151 static struct radius_session *
 152 radius_server_get_session(struct radius_client *client, unsigned int sess_id)
 153 {
 154         struct radius_session *sess = client->sessions;
 155
 156         while (sess) {
 157                 if (sess->sess_id == sess_id) {
 158                         break;
 159                 }
 160                 sess = sess->next;
 161         }
 162
 163         return sess;
 164 }
 165
 166
 167 static void radius_server_session_free(struct radius_server_data *data,
 168                                        struct radius_session *sess)
 169 {
 170         eloop_cancel_timeout(radius_server_session_timeout, data, sess);
 171         free(sess->eapKeyData);
 172         free(sess->eapReqData);
 173         eap_sm_deinit(sess->eap);
 174         if (sess->last_msg) {
 175                 radius_msg_free(sess->last_msg);
 176                 free(sess->last_msg);
 177         }
 178         free(sess->last_from_addr);
 179         if (sess->last_reply) {
 180                 radius_msg_free(sess->last_reply);
 181                 free(sess->last_reply);
 182         }
 183         free(sess);
 184         data->num_sess--;
 185 }
 186
 187
 188 static void radius_server_session_remove_timeout(void *eloop_ctx,
 189                                                  void *timeout_ctx);
 190
 191 static void radius_server_session_remove(struct radius_server_data *data,
 192                                          struct radius_session *sess)
 193 {
 194         struct radius_client *client = sess->client;
 195         struct radius_session *session, *prev;
 196
 197         eloop_cancel_timeout(radius_server_session_remove_timeout, data, sess);
 198
 199         prev = NULL;
 200         session = client->sessions;
 201         while (session) {
 202                 if (session == sess) {
 203                         if (prev == NULL) {
 204                                 client->sessions = sess->next;
 205                         } else {
 206                                 prev->next = sess->next;
 207                         }
 208                         radius_server_session_free(data, sess);
 209                         break;
 210                 }
 211                 prev = session;
 212                 session = session->next;
 213         }
 214 }
 215
 216
 217 static void radius_server_session_remove_timeout(void *eloop_ctx,
 218                                                  void *timeout_ctx)
 219 {
 220         struct radius_server_data *data = eloop_ctx;
 221         struct radius_session *sess = timeout_ctx;
 222         RADIUS_DEBUG("Removing completed session 0x%x", sess->sess_id);
 223         radius_server_session_remove(data, sess);
 224 }
 225
 226
 227 static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx)
 228 {
 229         struct radius_server_data *data = eloop_ctx;
 230         struct radius_session *sess = timeout_ctx;
 231
 232         RADIUS_DEBUG("Timing out authentication session 0x%x", sess->sess_id);
 233         radius_server_session_remove(data, sess);
 234 }
 235
 236
 237 static struct radius_session *
 238 radius_server_new_session(struct radius_server_data *data,
 239                           struct radius_client *client)
 240 {
 241         struct radius_session *sess;
 242
 243         if (data->num_sess >= RADIUS_MAX_SESSION) {
 244                 RADIUS_DEBUG("Maximum number of existing session - no room "
 245                              "for a new session");
 246                 return NULL;
 247         }
 248
 249         sess = wpa_zalloc(sizeof(*sess));
 250         if (sess == NULL)
 251                 return NULL;
 252
 253         sess->server = data;
 254         sess->client = client;
 255         sess->sess_id = data->next_sess_id++;
 256         sess->next = client->sessions;
 257         client->sessions = sess;
 258         eloop_register_timeout(RADIUS_SESSION_TIMEOUT, 0,
 259                                radius_server_session_timeout, data, sess);
 260         data->num_sess++;
 261         return sess;
 262 }
 263
 264
 265 static struct radius_session *
 266 radius_server_get_new_session(struct radius_server_data *data,
 267                               struct radius_client *client,
 268                               struct radius_msg *msg)
 269 {
 270         u8 *user;
 271         size_t user_len;
 272         const struct hostapd_eap_user *eap_user;
 273         int res;
 274         struct radius_session *sess;
 275         struct eap_config eap_conf;
 276
 277         RADIUS_DEBUG("Creating a new session");
 278
 279         user = malloc(256);
 280         if (user == NULL) {
 281                 return NULL;
 282         }
 283         res = radius_msg_get_attr(msg, RADIUS_ATTR_USER_NAME, user, 256);
 284         if (res < 0 || res > 256) {
 285                 RADIUS_DEBUG("Could not get User-Name");
 286                 free(user);
 287                 return NULL;
 288         }
 289         user_len = res;
 290         RADIUS_DUMP_ASCII("User-Name", user, user_len);
 291
 292         eap_user = hostapd_get_eap_user(data->hostapd_conf, user, user_len, 0);
 293         free(user);
 294
 295         if (eap_user) {
 296                 RADIUS_DEBUG("Matching user entry found");
 297                 sess = radius_server_new_session(data, client);
 298                 if (sess == NULL) {
 299                         RADIUS_DEBUG("Failed to create a new session");
 300                         return NULL;
 301                 }
 302         } else {
 303                 RADIUS_DEBUG("User-Name not found from user database");
 304                 return NULL;
 305         }
 306
 307         memset(&eap_conf, 0, sizeof(eap_conf));
 308         eap_conf.ssl_ctx = data->ssl_ctx;
 309         eap_conf.eap_sim_db_priv = data->eap_sim_db_priv;
 310         eap_conf.backend_auth = TRUE;
 311         sess->eap = eap_sm_init(sess, &radius_server_eapol_cb, &eap_conf);
 312         if (sess->eap == NULL) {
 313                 RADIUS_DEBUG("Failed to initialize EAP state machine for the "
 314                              "new session");
 315                 radius_server_session_free(data, sess);
 316                 return NULL;
 317         }
 318         sess->eapRestart = TRUE;
 319         sess->portEnabled = TRUE;
 320
 321         RADIUS_DEBUG("New session 0x%x initialized", sess->sess_id);
 322
 323         return sess;
 324 }
 325
 326
 327 static struct radius_msg *
 328 radius_server_encapsulate_eap(struct radius_server_data *data,
 329                               struct radius_client *client,
 330                               struct radius_session *sess,
 331                               struct radius_msg *request)
 332 {
 333         struct radius_msg *msg;
 334         int code;
 335         unsigned int sess_id;
 336
 337         if (sess->eapFail) {
 338                 code = RADIUS_CODE_ACCESS_REJECT;
 339         } else if (sess->eapSuccess) {
 340                 code = RADIUS_CODE_ACCESS_ACCEPT;
 341         } else {
 342                 code = RADIUS_CODE_ACCESS_CHALLENGE;
 343         }
 344
 345         msg = radius_msg_new(code, request->hdr->identifier);
 346         if (msg == NULL) {
 347                 RADIUS_DEBUG("Failed to allocate reply message");
 348                 return NULL;
 349         }
 350
 351         sess_id = htonl(sess->sess_id);
 352         if (code == RADIUS_CODE_ACCESS_CHALLENGE &&
 353             !radius_msg_add_attr(msg, RADIUS_ATTR_STATE,
 354                                  (u8 *) &sess_id, sizeof(sess_id))) {
 355                 RADIUS_DEBUG("Failed to add State attribute");
 356         }
 357
 358         if (sess->eapReqData &&
 359             !radius_msg_add_eap(msg, sess->eapReqData, sess->eapReqDataLen)) {
 360                 RADIUS_DEBUG("Failed to add EAP-Message attribute");
 361         }
 362
 363         if (code == RADIUS_CODE_ACCESS_ACCEPT && sess->eapKeyData) {
 364                 int len;
 365                 if (sess->eapKeyDataLen > 64) {
 366                         len = 32;
 367                 } else {
 368                         len = sess->eapKeyDataLen / 2;
 369                 }
 370                 if (!radius_msg_add_mppe_keys(msg, request->hdr->authenticator,
 371                                               (u8 *) client->shared_secret,
 372                                               client->shared_secret_len,
 373                                               sess->eapKeyData + len, len,
 374                                               sess->eapKeyData, len)) {
 375                         RADIUS_DEBUG("Failed to add MPPE key attributes");
 376                 }
 377         }
 378
 379         if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret,
 380                                   client->shared_secret_len,
 381                                   request->hdr->authenticator) < 0) {
 382                 RADIUS_DEBUG("Failed to add Message-Authenticator attribute");
 383         }
 384
 385         return msg;
 386 }
 387
 388
 389 static int radius_server_reject(struct radius_server_data *data,
 390                                 struct radius_client *client,
 391                                 struct radius_msg *request,
 392                                 struct sockaddr *from, socklen_t fromlen,
 393                                 const char *from_addr, int from_port)
 394 {
 395         struct radius_msg *msg;
 396         int ret = 0;
 397         struct eap_hdr eapfail;
 398
 399         RADIUS_DEBUG("Reject invalid request from %s:%d",
 400                      from_addr, from_port);
 401
 402         msg = radius_msg_new(RADIUS_CODE_ACCESS_REJECT,
 403                              request->hdr->identifier);
 404         if (msg == NULL) {
 405                 return -1;
 406         }
 407
 408         memset(&eapfail, 0, sizeof(eapfail));
 409         eapfail.code = EAP_CODE_FAILURE;
 410         eapfail.identifier = 0;
 411         eapfail.length = htons(sizeof(eapfail));
 412
 413         if (!radius_msg_add_eap(msg, (u8 *) &eapfail, sizeof(eapfail))) {
 414                 RADIUS_DEBUG("Failed to add EAP-Message attribute");
 415         }
 416
 417
 418         if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret,
 419                                   client->shared_secret_len,
 420                                   request->hdr->authenticator) < 0) {
 421                 RADIUS_DEBUG("Failed to add Message-Authenticator attribute");
 422         }
 423
 424         if (wpa_debug_level <= MSG_MSGDUMP) {
 425                 radius_msg_dump(msg);
 426         }
 427
 428         data->counters.access_rejects++;
 429         client->counters.access_rejects++;
 430         if (sendto(data->auth_sock, msg->buf, msg->buf_used, 0,
 431                    (struct sockaddr *) from, sizeof(*from)) < 0) {
 432                 perror("sendto[RADIUS SRV]");
 433                 ret = -1;
 434         }
 435
 436         radius_msg_free(msg);
 437         free(msg);
 438
 439         return ret;
 440 }
 441
 442
 443 static int radius_server_request(struct radius_server_data *data,
 444                                  struct radius_msg *msg,
 445                                  struct sockaddr *from, socklen_t fromlen,
 446                                  struct radius_client *client,
 447                                  const char *from_addr, int from_port,
 448                                  struct radius_session *force_sess)
 449 {
 450         u8 *eap = NULL;
 451         size_t eap_len;
 452         int res, state_included = 0;
 453         u8 statebuf[4], resp_id;
 454         unsigned int state;
 455         struct radius_session *sess;
 456         struct radius_msg *reply;
 457         struct eap_hdr *hdr;
 458
 459         if (force_sess)
 460                 sess = force_sess;
 461         else {
 462                 res = radius_msg_get_attr(msg, RADIUS_ATTR_STATE, statebuf,
 463                                           sizeof(statebuf));
 464                 state_included = res >= 0;
 465                 if (res == sizeof(statebuf)) {
 466                         state = (statebuf[0] << 24) | (statebuf[1] << 16) |
 467                                 (statebuf[2] << 8) | statebuf[3];
 468                         sess = radius_server_get_session(client, state);
 469                 } else {
 470                         sess = NULL;
 471                 }
 472         }
 473
 474         if (sess) {
 475                 RADIUS_DEBUG("Request for session 0x%x", sess->sess_id);
 476         } else if (state_included) {
 477                 RADIUS_DEBUG("State attribute included but no session found");
 478                 radius_server_reject(data, client, msg, from, fromlen,
 479                                      from_addr, from_port);
 480                 return -1;
 481         } else {
 482                 sess = radius_server_get_new_session(data, client, msg);
 483                 if (sess == NULL) {
 484                         RADIUS_DEBUG("Could not create a new session");
 485                         radius_server_reject(data, client, msg, from, fromlen,
 486                                              from_addr, from_port);
 487                         return -1;
 488                 }
 489         }
 490
 491         if (sess->last_from_port == from_port &&
 492             sess->last_identifier == msg->hdr->identifier &&
 493             os_memcmp(sess->last_authenticator, msg->hdr->authenticator, 16) ==
 494             0) {
 495                 RADIUS_DEBUG("Duplicate message from %s", from_addr);
 496                 data->counters.dup_access_requests++;
 497                 client->counters.dup_access_requests++;
 498
 499                 if (sess->last_reply) {
 500                         res = sendto(data->auth_sock, sess->last_reply->buf,
 501                                      sess->last_reply->buf_used, 0,
 502                                      (struct sockaddr *) from, fromlen);
 503                         if (res < 0) {
 504                                 perror("sendto[RADIUS SRV]");
 505                         }
 506                         return 0;
 507                 }
 508
 509                 RADIUS_DEBUG("No previous reply available for duplicate "
 510                              "message");
 511                 return -1;
 512         }
 513
 514         eap = radius_msg_get_eap(msg, &eap_len);
 515         if (eap == NULL) {
 516                 RADIUS_DEBUG("No EAP-Message in RADIUS packet from %s",
 517                              from_addr);
 518                 data->counters.packets_dropped++;
 519                 client->counters.packets_dropped++;
 520                 return -1;
 521         }
 522
 523         RADIUS_DUMP("Received EAP data", eap, eap_len);
 524         if (eap_len >= sizeof(*hdr)) {
 525                 hdr = (struct eap_hdr *) eap;
 526                 resp_id = hdr->identifier;
 527         } else {
 528                 resp_id = 0;
 529         }
 530
 531         /* FIX: if Code is Request, Success, or Failure, send Access-Reject;
 532          * RFC3579 Sect. 2.6.2.
 533          * Include EAP-Response/Nak with no preferred method if
 534          * code == request.
 535          * If code is not 1-4, discard the packet silently.
 536          * Or is this already done by the EAP state machine? */
 537
 538         eap_set_eapRespData(sess->eap, eap, eap_len);
 539         free(eap);
 540         eap = NULL;
 541         sess->eapResp = TRUE;
 542         eap_sm_step(sess->eap);
 543
 544         if (sess->eapReqData) {
 545                 RADIUS_DUMP("EAP data from the state machine",
 546                             sess->eapReqData, sess->eapReqDataLen);
 547         } else if (sess->eapFail) {
 548                 RADIUS_DEBUG("No EAP data from the state machine, but eapFail "
 549                              "set - generate EAP-Failure");
 550                 hdr = wpa_zalloc(sizeof(*hdr));
 551                 if (hdr) {
 552                         hdr->identifier = resp_id;
 553                         hdr->length = htons(sizeof(*hdr));
 554                         sess->eapReqData = (u8 *) hdr;
 555                         sess->eapReqDataLen = sizeof(*hdr);
 556                 }
 557         } else if (eap_sm_method_pending(sess->eap)) {
 558                 if (sess->last_msg) {
 559                         radius_msg_free(sess->last_msg);
 560                         free(sess->last_msg);
 561                 }
 562                 sess->last_msg = msg;
 563                 sess->last_from_port = from_port;
 564                 free(sess->last_from_addr);
 565                 sess->last_from_addr = strdup(from_addr);
 566                 sess->last_fromlen = fromlen;
 567                 memcpy(&sess->last_from, from, fromlen);
 568                 return -2;
 569         } else {
 570                 RADIUS_DEBUG("No EAP data from the state machine - ignore this"
 571                              " Access-Request silently (assuming it was a "
 572                              "duplicate)");
 573                 data->counters.packets_dropped++;
 574                 client->counters.packets_dropped++;
 575                 return -1;
 576         }
 577
 578         reply = radius_server_encapsulate_eap(data, client, sess, msg);
 579
 580         free(sess->eapReqData);
 581         sess->eapReqData = NULL;
 582         sess->eapReqDataLen = 0;
 583
 584         if (reply) {
 585                 RADIUS_DEBUG("Reply to %s:%d", from_addr, from_port);
 586                 if (wpa_debug_level <= MSG_MSGDUMP) {
 587                         radius_msg_dump(reply);
 588                 }
 589
 590                 switch (reply->hdr->code) {
 591                 case RADIUS_CODE_ACCESS_ACCEPT:
 592                         data->counters.access_accepts++;
 593                         client->counters.access_accepts++;
 594                         break;
 595                 case RADIUS_CODE_ACCESS_REJECT:
 596                         data->counters.access_rejects++;
 597                         client->counters.access_rejects++;
 598                         break;
 599                 case RADIUS_CODE_ACCESS_CHALLENGE:
 600                         data->counters.access_challenges++;
 601                         client->counters.access_challenges++;
 602                         break;
 603                 }
 604                 res = sendto(data->auth_sock, reply->buf, reply->buf_used, 0,
 605                              (struct sockaddr *) from, fromlen);
 606                 if (res < 0) {
 607                         perror("sendto[RADIUS SRV]");
 608                 }
 609                 if (sess->last_reply) {
 610                         radius_msg_free(sess->last_reply);
 611                         free(sess->last_reply);
 612                 }
 613                 sess->last_reply = reply;
 614                 sess->last_from_port = from_port;
 615                 sess->last_identifier = msg->hdr->identifier;
 616                 os_memcpy(sess->last_authenticator, msg->hdr->authenticator,
 617                           16);
 618         } else {
 619                 data->counters.packets_dropped++;
 620                 client->counters.packets_dropped++;
 621         }
 622
 623         if (sess->eapSuccess || sess->eapFail) {
 624                 RADIUS_DEBUG("Removing completed session 0x%x after timeout",
 625                              sess->sess_id);
 626                 eloop_cancel_timeout(radius_server_session_remove_timeout,
 627                                      data, sess);
 628                 eloop_register_timeout(10, 0,
 629                                        radius_server_session_remove_timeout,
 630                                        data, sess);
 631         }
 632
 633         return 0;
 634 }
 635
 636
 637 static void radius_server_receive_auth(int sock, void *eloop_ctx,
 638                                        void *sock_ctx)
 639 {
 640         struct radius_server_data *data = eloop_ctx;
 641         u8 *buf = NULL;
 642         struct sockaddr_storage from;
 643         socklen_t fromlen;
 644         int len;
 645         struct radius_client *client = NULL;
 646         struct radius_msg *msg = NULL;
 647         char abuf[50];
 648         int from_port = 0;
 649
 650         buf = malloc(RADIUS_MAX_MSG_LEN);
 651         if (buf == NULL) {
 652                 goto fail;
 653         }
 654
 655         fromlen = sizeof(from);
 656         len = recvfrom(sock, buf, RADIUS_MAX_MSG_LEN, 0,
 657                        (struct sockaddr *) &from, &fromlen);
 658         if (len < 0) {
 659                 perror("recvfrom[radius_server]");
 660                 goto fail;
 661         }
 662
 663 #ifdef CONFIG_IPV6
 664         if (data->ipv6) {
 665                 struct sockaddr_in6 *from6 = (struct sockaddr_in6 *) &from;
 666                 if (inet_ntop(AF_INET6, &from6->sin6_addr, abuf, sizeof(abuf))
 667                     == NULL)
 668                         abuf[0] = '\0';
 669                 from_port = ntohs(from6->sin6_port);
 670                 RADIUS_DEBUG("Received %d bytes from %s:%d",
 671                              len, abuf, from_port);
 672
 673                 client = radius_server_get_client(data,
 674                                                   (struct in_addr *)
 675                                                   &from6->sin6_addr, 1);
 676         }
 677 #endif /* CONFIG_IPV6 */
 678
 679         if (!data->ipv6) {
 680                 struct sockaddr_in *from4 = (struct sockaddr_in *) &from;
 681                 snprintf(abuf, sizeof(abuf), "%s", inet_ntoa(from4->sin_addr));
 682                 from_port = ntohs(from4->sin_port);
 683                 RADIUS_DEBUG("Received %d bytes from %s:%d",
 684                              len, abuf, from_port);
 685
 686                 client = radius_server_get_client(data, &from4->sin_addr, 0);
 687         }
 688
 689         RADIUS_DUMP("Received data", buf, len);
 690
 691         if (client == NULL) {
 692                 RADIUS_DEBUG("Unknown client %s - packet ignored", abuf);
 693                 data->counters.invalid_requests++;
 694                 goto fail;
 695         }
 696
 697         msg = radius_msg_parse(buf, len);
 698         if (msg == NULL) {
 699                 RADIUS_DEBUG("Parsing incoming RADIUS frame failed");
 700                 data->counters.malformed_access_requests++;
 701                 client->counters.malformed_access_requests++;
 702                 goto fail;
 703         }
 704
 705         free(buf);
 706         buf = NULL;
 707
 708         if (wpa_debug_level <= MSG_MSGDUMP) {
 709                 radius_msg_dump(msg);
 710         }
 711
 712         if (msg->hdr->code != RADIUS_CODE_ACCESS_REQUEST) {
 713                 RADIUS_DEBUG("Unexpected RADIUS code %d", msg->hdr->code);
 714                 data->counters.unknown_types++;
 715                 client->counters.unknown_types++;
 716                 goto fail;
 717         }
 718
 719         data->counters.access_requests++;
 720         client->counters.access_requests++;
 721
 722         if (radius_msg_verify_msg_auth(msg, (u8 *) client->shared_secret,
 723                                        client->shared_secret_len, NULL)) {
 724                 RADIUS_DEBUG("Invalid Message-Authenticator from %s", abuf);
 725                 data->counters.bad_authenticators++;
 726                 client->counters.bad_authenticators++;
 727                 goto fail;
 728         }
 729
 730         if (radius_server_request(data, msg, (struct sockaddr *) &from,
 731                                   fromlen, client, abuf, from_port, NULL) ==
 732             -2)
 733                 return; /* msg was stored with the session */
 734
 735 fail:
 736         if (msg) {
 737                 radius_msg_free(msg);
 738                 free(msg);
 739         }
 740         free(buf);
 741 }
 742
 743
 744 static int radius_server_open_socket(int port)
 745 {
 746         int s;
 747         struct sockaddr_in addr;
 748
 749         s = socket(PF_INET, SOCK_DGRAM, 0);
 750         if (s < 0) {
 751                 perror("socket");
 752                 return -1;
 753         }
 754
 755         memset(&addr, 0, sizeof(addr));
 756         addr.sin_family = AF_INET;
 757         addr.sin_port = htons(port);
 758         if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 759                 perror("bind");
 760                 close(s);
 761                 return -1;
 762         }
 763
 764         return s;
 765 }
 766
 767
 768 #ifdef CONFIG_IPV6
 769 static int radius_server_open_socket6(int port)
 770 {
 771         int s;
 772         struct sockaddr_in6 addr;
 773
 774         s = socket(PF_INET6, SOCK_DGRAM, 0);
 775         if (s < 0) {
 776                 perror("socket[IPv6]");
 777                 return -1;
 778         }
 779
 780         memset(&addr, 0, sizeof(addr));
 781         addr.sin6_family = AF_INET6;
 782         memcpy(&addr.sin6_addr, &in6addr_any, sizeof(in6addr_any));
 783         addr.sin6_port = htons(port);
 784         if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 785                 perror("bind");
 786                 close(s);
 787                 return -1;
 788         }
 789
 790         return s;
 791 }
 792 #endif /* CONFIG_IPV6 */
 793
 794
 795 static void radius_server_free_sessions(struct radius_server_data *data,
 796                                         struct radius_session *sessions)
 797 {
 798         struct radius_session *session, *prev;
 799
 800         session = sessions;
 801         while (session) {
 802                 prev = session;
 803                 session = session->next;
 804                 radius_server_session_free(data, prev);
 805         }
 806 }
 807
 808
 809 static void radius_server_free_clients(struct radius_server_data *data,
 810                                        struct radius_client *clients)
 811 {
 812         struct radius_client *client, *prev;
 813
 814         client = clients;
 815         while (client) {
 816                 prev = client;
 817                 client = client->next;
 818
 819                 radius_server_free_sessions(data, prev->sessions);
 820                 free(prev->shared_secret);
 821                 free(prev);
 822         }
 823 }
 824
 825
 826 static struct radius_client *
 827 radius_server_read_clients(const char *client_file, int ipv6)
 828 {
 829         FILE *f;
 830         const int buf_size = 1024;
 831         char *buf, *pos;
 832         struct radius_client *clients, *tail, *entry;
 833         int line = 0, mask, failed = 0, i;
 834         struct in_addr addr;
 835 #ifdef CONFIG_IPV6
 836         struct in6_addr addr6;
 837 #endif /* CONFIG_IPV6 */
 838         unsigned int val;
 839
 840         f = fopen(client_file, "r");
 841         if (f == NULL) {
 842                 RADIUS_ERROR("Could not open client file '%s'", client_file);
 843                 return NULL;
 844         }
 845
 846         buf = malloc(buf_size);
 847         if (buf == NULL) {
 848                 fclose(f);
 849                 return NULL;
 850         }
 851
 852         clients = tail = NULL;
 853         while (fgets(buf, buf_size, f)) {
 854                 /* Configuration file format:
 855                  * 192.168.1.0/24 secret
 856                  * 192.168.1.2 secret
 857                  * fe80::211:22ff:fe33:4455/64 secretipv6
 858                  */
 859                 line++;
 860                 buf[buf_size - 1] = '\0';
 861                 pos = buf;
 862                 while (*pos != '\0' && *pos != '\n')
 863                         pos++;
 864                 if (*pos == '\n')
 865                         *pos = '\0';
 866                 if (*buf == '\0' || *buf == '#')
 867                         continue;
 868
 869                 pos = buf;
 870                 while ((*pos >= '0' && *pos <= '9') || *pos == '.' ||
 871                        (*pos >= 'a' && *pos <= 'f') || *pos == ':' ||
 872                        (*pos >= 'A' && *pos <= 'F')) {
 873                         pos++;
 874                 }
 875
 876                 if (*pos == '\0') {
 877                         failed = 1;
 878                         break;
 879                 }
 880
 881                 if (*pos == '/') {
 882                         char *end;
 883                         *pos++ = '\0';
 884                         mask = strtol(pos, &end, 10);
 885                         if ((pos == end) ||
 886                             (mask < 0 || mask > (ipv6 ? 128 : 32))) {
 887                                 failed = 1;
 888                                 break;
 889                         }
 890                         pos = end;
 891                 } else {
 892                         mask = ipv6 ? 128 : 32;
 893                         *pos++ = '\0';
 894                 }
 895
 896                 if (!ipv6 && inet_aton(buf, &addr) == 0) {
 897                         failed = 1;
 898                         break;
 899                 }
 900 #ifdef CONFIG_IPV6
 901                 if (ipv6 && inet_pton(AF_INET6, buf, &addr6) <= 0) {
 902                         if (inet_pton(AF_INET, buf, &addr) <= 0) {
 903                                 failed = 1;
 904                                 break;
 905                         }
 906                         /* Convert IPv4 address to IPv6 */
 907                         if (mask <= 32)
 908                                 mask += (128 - 32);
 909                         memset(addr6.s6_addr, 0, 10);
 910                         addr6.s6_addr[10] = 0xff;
 911                         addr6.s6_addr[11] = 0xff;
 912                         memcpy(addr6.s6_addr + 12, (char *) &addr.s_addr, 4);
 913                 }
 914 #endif /* CONFIG_IPV6 */
 915
 916                 while (*pos == ' ' || *pos == '\t') {
 917                         pos++;
 918                 }
 919
 920                 if (*pos == '\0') {
 921                         failed = 1;
 922                         break;
 923                 }
 924
 925                 entry = wpa_zalloc(sizeof(*entry));
 926                 if (entry == NULL) {
 927                         failed = 1;
 928                         break;
 929                 }
 930                 entry->shared_secret = strdup(pos);
 931                 if (entry->shared_secret == NULL) {
 932                         failed = 1;
 933                         free(entry);
 934                         break;
 935                 }
 936                 entry->shared_secret_len = strlen(entry->shared_secret);
 937                 entry->addr.s_addr = addr.s_addr;
 938                 if (!ipv6) {
 939                         val = 0;
 940                         for (i = 0; i < mask; i++)
 941                                 val |= 1 << (31 - i);
 942                         entry->mask.s_addr = htonl(val);
 943                 }
 944 #ifdef CONFIG_IPV6
 945                 if (ipv6) {
 946                         int offset = mask / 8;
 947
 948                         memcpy(entry->addr6.s6_addr, addr6.s6_addr, 16);
 949                         memset(entry->mask6.s6_addr, 0xff, offset);
 950                         val = 0;
 951                         for (i = 0; i < (mask % 8); i++)
 952                                 val |= 1 << (7 - i);
 953                         if (offset < 16)
 954                                 entry->mask6.s6_addr[offset] = val;
 955                 }
 956 #endif /* CONFIG_IPV6 */
 957
 958                 if (tail == NULL) {
 959                         clients = tail = entry;
 960                 } else {
 961                         tail->next = entry;
 962                         tail = entry;
 963                 }
 964         }
 965
 966         if (failed) {
 967                 RADIUS_ERROR("Invalid line %d in '%s'", line, client_file);
 968                 radius_server_free_clients(NULL, clients);
 969                 clients = NULL;
 970         }
 971
 972         free(buf);
 973         fclose(f);
 974
 975         return clients;
 976 }
 977
 978
 979 struct radius_server_data *
 980 radius_server_init(struct radius_server_conf *conf)
 981 {
 982         struct radius_server_data *data;
 983
 984 #ifndef CONFIG_IPV6
 985         if (conf->ipv6) {
 986                 fprintf(stderr, "RADIUS server compiled without IPv6 "
 987                         "support.\n");
 988                 return NULL;
 989         }
 990 #endif /* CONFIG_IPV6 */
 991
 992         data = wpa_zalloc(sizeof(*data));
 993         if (data == NULL)
 994                 return NULL;
 995
 996         os_get_time(&data->start_time);
 997         data->hostapd_conf = conf->hostapd_conf;
 998         data->eap_sim_db_priv = conf->eap_sim_db_priv;
 999         data->ssl_ctx = conf->ssl_ctx;
1000         data->ipv6 = conf->ipv6;
1001
1002         data->clients = radius_server_read_clients(conf->client_file,
1003                                                    conf->ipv6);
1004         if (data->clients == NULL) {
1005                 printf("No RADIUS clients configured.\n");
1006                 radius_server_deinit(data);
1007                 return NULL;
1008         }
1009
1010 #ifdef CONFIG_IPV6
1011         if (conf->ipv6)
1012                 data->auth_sock = radius_server_open_socket6(conf->auth_port);
1013         else
1014 #endif /* CONFIG_IPV6 */
1015         data->auth_sock = radius_server_open_socket(conf->auth_port);
1016         if (data->auth_sock < 0) {
1017                 printf("Failed to open UDP socket for RADIUS authentication "
1018                        "server\n");
1019                 radius_server_deinit(data);
1020                 return NULL;
1021         }
1022         if (eloop_register_read_sock(data->auth_sock,
1023                                      radius_server_receive_auth,
1024                                      data, NULL)) {
1025                 radius_server_deinit(data);
1026                 return NULL;
1027         }
1028
1029         return data;
1030 }
1031
1032
1033 void radius_server_deinit(struct radius_server_data *data)
1034 {
1035         if (data == NULL)
1036                 return;
1037
1038         if (data->auth_sock >= 0) {
1039                 eloop_unregister_read_sock(data->auth_sock);
1040                 close(data->auth_sock);
1041         }
1042
1043         radius_server_free_clients(data, data->clients);
1044
1045         free(data);
1046 }
1047
1048
1049 int radius_server_get_mib(struct radius_server_data *data, char *buf,
1050                           size_t buflen)
1051 {
1052         int ret, uptime;
1053         unsigned int idx;
1054         char *end, *pos;
1055         struct os_time now;
1056         struct radius_client *cli;
1057
1058         /* RFC 2619 - RADIUS Authentication Server MIB */
1059
1060         if (data == NULL || buflen == 0)
1061                 return 0;
1062
1063         pos = buf;
1064         end = buf + buflen;
1065
1066         os_get_time(&now);
1067         uptime = (now.sec - data->start_time.sec) * 100 +
1068                 ((now.usec - data->start_time.usec) / 10000) % 100;
1069         ret = snprintf(pos, end - pos,
1070                        "RADIUS-AUTH-SERVER-MIB\n"
1071                        "radiusAuthServIdent=hostapd\n"
1072                        "radiusAuthServUpTime=%d\n"
1073                        "radiusAuthServResetTime=0\n"
1074                        "radiusAuthServConfigReset=4\n",
1075                        uptime);
1076         if (ret < 0 || ret >= end - pos) {
1077                 *pos = '\0';
1078                 return pos - buf;
1079         }
1080         pos += ret;
1081
1082         ret = snprintf(pos, end - pos,
1083                        "radiusAuthServTotalAccessRequests=%u\n"
1084                        "radiusAuthServTotalInvalidRequests=%u\n"
1085                        "radiusAuthServTotalDupAccessRequests=%u\n"
1086                        "radiusAuthServTotalAccessAccepts=%u\n"
1087                        "radiusAuthServTotalAccessRejects=%u\n"
1088                        "radiusAuthServTotalAccessChallenges=%u\n"
1089                        "radiusAuthServTotalMalformedAccessRequests=%u\n"
1090                        "radiusAuthServTotalBadAuthenticators=%u\n"
1091                        "radiusAuthServTotalPacketsDropped=%u\n"
1092                        "radiusAuthServTotalUnknownTypes=%u\n",
1093                        data->counters.access_requests,
1094                        data->counters.invalid_requests,
1095                        data->counters.dup_access_requests,
1096                        data->counters.access_accepts,
1097                        data->counters.access_rejects,
1098                        data->counters.access_challenges,
1099                        data->counters.malformed_access_requests,
1100                        data->counters.bad_authenticators,
1101                        data->counters.packets_dropped,
1102                        data->counters.unknown_types);
1103         if (ret < 0 || ret >= end - pos) {
1104                 *pos = '\0';
1105                 return pos - buf;
1106         }
1107         pos += ret;
1108
1109         for (cli = data->clients, idx = 0; cli; cli = cli->next, idx++) {
1110                 char abuf[50], mbuf[50];
1111 #ifdef CONFIG_IPV6
1112                 if (data->ipv6) {
1113                         if (inet_ntop(AF_INET6, &cli->addr6, abuf,
1114                                       sizeof(abuf)) == NULL)
1115                                 abuf[0] = '\0';
1116                         if (inet_ntop(AF_INET6, &cli->mask6, abuf,
1117                                       sizeof(mbuf)) == NULL)
1118                                 mbuf[0] = '\0';
1119                 }
1120 #endif /* CONFIG_IPV6 */
1121                 if (!data->ipv6) {
1122                         snprintf(abuf, sizeof(abuf), "%s",
1123                                  inet_ntoa(cli->addr));
1124                         snprintf(mbuf, sizeof(mbuf), "%s",
1125                                  inet_ntoa(cli->mask));
1126                 }
1127
1128                 ret = snprintf(pos, end - pos,
1129                                "radiusAuthClientIndex=%u\n"
1130                                "radiusAuthClientAddress=%s/%s\n"
1131                                "radiusAuthServAccessRequests=%u\n"
1132                                "radiusAuthServDupAccessRequests=%u\n"
1133                                "radiusAuthServAccessAccepts=%u\n"
1134                                "radiusAuthServAccessRejects=%u\n"
1135                                "radiusAuthServAccessChallenges=%u\n"
1136                                "radiusAuthServMalformedAccessRequests=%u\n"
1137                                "radiusAuthServBadAuthenticators=%u\n"
1138                                "radiusAuthServPacketsDropped=%u\n"
1139                                "radiusAuthServUnknownTypes=%u\n",
1140                                idx,
1141                                abuf, mbuf,
1142                                cli->counters.access_requests,
1143                                cli->counters.dup_access_requests,
1144                                cli->counters.access_accepts,
1145                                cli->counters.access_rejects,
1146                                cli->counters.access_challenges,
1147                                cli->counters.malformed_access_requests,
1148                                cli->counters.bad_authenticators,
1149                                cli->counters.packets_dropped,
1150                                cli->counters.unknown_types);
1151                 if (ret < 0 || ret >= end - pos) {
1152                         *pos = '\0';
1153                         return pos - buf;
1154                 }
1155                 pos += ret;
1156         }
1157
1158         return pos - buf;
1159 }
1160
1161
1162 static Boolean radius_server_get_bool(void *ctx, enum eapol_bool_var variable)
1163 {
1164         struct radius_session *sess = ctx;
1165         if (sess == NULL)
1166                 return FALSE;
1167         switch (variable) {
1168         case EAPOL_eapSuccess:
1169                 return sess->eapSuccess;
1170         case EAPOL_eapRestart:
1171                 return sess->eapRestart;
1172         case EAPOL_eapFail:
1173                 return sess->eapFail;
1174         case EAPOL_eapResp:
1175                 return sess->eapResp;
1176         case EAPOL_eapReq:
1177                 return sess->eapReq;
1178         case EAPOL_eapNoReq:
1179                 return sess->eapNoReq;
1180         case EAPOL_portEnabled:
1181                 return sess->portEnabled;
1182         case EAPOL_eapTimeout:
1183                 return sess->eapTimeout;
1184         }
1185         return FALSE;
1186 }
1187
1188
1189 static void radius_server_set_bool(void *ctx, enum eapol_bool_var variable,
1190                               Boolean value)
1191 {
1192         struct radius_session *sess = ctx;
1193         if (sess == NULL)
1194                 return;
1195         switch (variable) {
1196         case EAPOL_eapSuccess:
1197                 sess->eapSuccess = value;
1198                 break;
1199         case EAPOL_eapRestart:
1200                 sess->eapRestart = value;
1201                 break;
1202         case EAPOL_eapFail:
1203                 sess->eapFail = value;
1204                 break;
1205         case EAPOL_eapResp:
1206                 sess->eapResp = value;
1207                 break;
1208         case EAPOL_eapReq:
1209                 sess->eapReq = value;
1210                 break;
1211         case EAPOL_eapNoReq:
1212                 sess->eapNoReq = value;
1213                 break;
1214         case EAPOL_portEnabled:
1215                 sess->portEnabled = value;
1216                 break;
1217         case EAPOL_eapTimeout:
1218                 sess->eapTimeout = value;
1219                 break;
1220         }
1221 }
1222
1223
1224 static void radius_server_set_eapReqData(void *ctx, const u8 *eapReqData,
1225                                     size_t eapReqDataLen)
1226 {
1227         struct radius_session *sess = ctx;
1228         if (sess == NULL)
1229                 return;
1230
1231         free(sess->eapReqData);
1232         sess->eapReqData = malloc(eapReqDataLen);
1233         if (sess->eapReqData) {
1234                 memcpy(sess->eapReqData, eapReqData, eapReqDataLen);
1235                 sess->eapReqDataLen = eapReqDataLen;
1236         } else {
1237                 sess->eapReqDataLen = 0;
1238         }
1239 }
1240
1241
1242 static void radius_server_set_eapKeyData(void *ctx, const u8 *eapKeyData,
1243                                     size_t eapKeyDataLen)
1244 {
1245         struct radius_session *sess = ctx;
1246
1247         if (sess == NULL)
1248                 return;
1249
1250         free(sess->eapKeyData);
1251         if (eapKeyData) {
1252                 sess->eapKeyData = malloc(eapKeyDataLen);
1253                 if (sess->eapKeyData) {
1254                         memcpy(sess->eapKeyData, eapKeyData, eapKeyDataLen);
1255                         sess->eapKeyDataLen = eapKeyDataLen;
1256                 } else {
1257                         sess->eapKeyDataLen = 0;
1258                 }
1259         } else {
1260                 sess->eapKeyData = NULL;
1261                 sess->eapKeyDataLen = 0;
1262         }
1263 }
1264
1265
1266 static int radius_server_get_eap_user(void *ctx, const u8 *identity,
1267                                       size_t identity_len, int phase2,
1268                                       struct eap_user *user)
1269 {
1270         struct radius_session *sess = ctx;
1271         const struct hostapd_eap_user *eap_user;
1272         int i, count;
1273
1274         eap_user = hostapd_get_eap_user(sess->server->hostapd_conf, identity,
1275                                         identity_len, phase2);
1276         if (eap_user == NULL)
1277                 return -1;
1278
1279         memset(user, 0, sizeof(*user));
1280         count = EAP_USER_MAX_METHODS;
1281         if (count > EAP_MAX_METHODS)
1282                 count = EAP_MAX_METHODS;
1283         for (i = 0; i < count; i++) {
1284                 user->methods[i].vendor = eap_user->methods[i].vendor;
1285                 user->methods[i].method = eap_user->methods[i].method;
1286         }
1287
1288         if (eap_user->password) {
1289                 user->password = malloc(eap_user->password_len);
1290                 if (user->password == NULL)
1291                         return -1;
1292                 memcpy(user->password, eap_user->password,
1293                        eap_user->password_len);
1294                 user->password_len = eap_user->password_len;
1295                 user->password_hash = eap_user->password_hash;
1296         }
1297         user->force_version = eap_user->force_version;
1298
1299         return 0;
1300 }
1301
1302
1303 static struct eapol_callbacks radius_server_eapol_cb =
1304 {
1305         .get_bool = radius_server_get_bool,
1306         .set_bool = radius_server_set_bool,
1307         .set_eapReqData = radius_server_set_eapReqData,
1308         .set_eapKeyData = radius_server_set_eapKeyData,
1309         .get_eap_user = radius_server_get_eap_user,
1310 };
1311
1312
1313 void radius_server_eap_pending_cb(struct radius_server_data *data, void *ctx)
1314 {
1315         struct radius_client *cli;
1316         struct radius_session *s, *sess = NULL;
1317         struct radius_msg *msg;
1318
1319         if (data == NULL)
1320                 return;
1321
1322         for (cli = data->clients; cli; cli = cli->next) {
1323                 for (s = cli->sessions; s; s = s->next) {
1324                         if (s->eap == ctx && s->last_msg) {
1325                                 sess = s;
1326                                 break;
1327                         }
1328                         if (sess)
1329                                 break;
1330                 }
1331                 if (sess)
1332                         break;
1333         }
1334
1335         if (sess == NULL) {
1336                 RADIUS_DEBUG("No session matched callback ctx");
1337                 return;
1338         }
1339
1340         msg = sess->last_msg;
1341         sess->last_msg = NULL;
1342         eap_sm_pending_cb(sess->eap);
1343         if (radius_server_request(data, msg,
1344                                   (struct sockaddr *) &sess->last_from,
1345                                   sess->last_fromlen, cli,
1346                                   sess->last_from_addr,
1347                                   sess->last_from_port, sess) == -2)
1348                 return; /* msg was stored with the session */
1349
1350         radius_msg_free(msg);
1351         free(msg);
1352 }