contrib/hostapd/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 "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_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) {
 380                 RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)");
 381                 radius_msg_free(msg);
 382                 os_free(msg);
 383                 return NULL;
 384         }
 385
 386         if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret,
 387                                   client->shared_secret_len,
 388                                   request->hdr->authenticator) < 0) {
 389                 RADIUS_DEBUG("Failed to add Message-Authenticator attribute");
 390         }
 391
 392         return msg;
 393 }
 394
 395
 396 static int radius_server_reject(struct radius_server_data *data,
 397                                 struct radius_client *client,
 398                                 struct radius_msg *request,
 399                                 struct sockaddr *from, socklen_t fromlen,
 400                                 const char *from_addr, int from_port)
 401 {
 402         struct radius_msg *msg;
 403         int ret = 0;
 404         struct eap_hdr eapfail;
 405
 406         RADIUS_DEBUG("Reject invalid request from %s:%d",
 407                      from_addr, from_port);
 408
 409         msg = radius_msg_new(RADIUS_CODE_ACCESS_REJECT,
 410                              request->hdr->identifier);
 411         if (msg == NULL) {
 412                 return -1;
 413         }
 414
 415         memset(&eapfail, 0, sizeof(eapfail));
 416         eapfail.code = EAP_CODE_FAILURE;
 417         eapfail.identifier = 0;
 418         eapfail.length = htons(sizeof(eapfail));
 419
 420         if (!radius_msg_add_eap(msg, (u8 *) &eapfail, sizeof(eapfail))) {
 421                 RADIUS_DEBUG("Failed to add EAP-Message attribute");
 422         }
 423
 424         if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) {
 425                 RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)");
 426                 radius_msg_free(msg);
 427                 os_free(msg);
 428                 return -1;
 429         }
 430
 431         if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret,
 432                                   client->shared_secret_len,
 433                                   request->hdr->authenticator) < 0) {
 434                 RADIUS_DEBUG("Failed to add Message-Authenticator attribute");
 435         }
 436
 437         if (wpa_debug_level <= MSG_MSGDUMP) {
 438                 radius_msg_dump(msg);
 439         }
 440
 441         data->counters.access_rejects++;
 442         client->counters.access_rejects++;
 443         if (sendto(data->auth_sock, msg->buf, msg->buf_used, 0,
 444                    (struct sockaddr *) from, sizeof(*from)) < 0) {
 445                 perror("sendto[RADIUS SRV]");
 446                 ret = -1;
 447         }
 448
 449         radius_msg_free(msg);
 450         free(msg);
 451
 452         return ret;
 453 }
 454
 455
 456 static int radius_server_request(struct radius_server_data *data,
 457                                  struct radius_msg *msg,
 458                                  struct sockaddr *from, socklen_t fromlen,
 459                                  struct radius_client *client,
 460                                  const char *from_addr, int from_port,
 461                                  struct radius_session *force_sess)
 462 {
 463         u8 *eap = NULL;
 464         size_t eap_len;
 465         int res, state_included = 0;
 466         u8 statebuf[4], resp_id;
 467         unsigned int state;
 468         struct radius_session *sess;
 469         struct radius_msg *reply;
 470         struct eap_hdr *hdr;
 471
 472         if (force_sess)
 473                 sess = force_sess;
 474         else {
 475                 res = radius_msg_get_attr(msg, RADIUS_ATTR_STATE, statebuf,
 476                                           sizeof(statebuf));
 477                 state_included = res >= 0;
 478                 if (res == sizeof(statebuf)) {
 479                         state = (statebuf[0] << 24) | (statebuf[1] << 16) |
 480                                 (statebuf[2] << 8) | statebuf[3];
 481                         sess = radius_server_get_session(client, state);
 482                 } else {
 483                         sess = NULL;
 484                 }
 485         }
 486
 487         if (sess) {
 488                 RADIUS_DEBUG("Request for session 0x%x", sess->sess_id);
 489         } else if (state_included) {
 490                 RADIUS_DEBUG("State attribute included but no session found");
 491                 radius_server_reject(data, client, msg, from, fromlen,
 492                                      from_addr, from_port);
 493                 return -1;
 494         } else {
 495                 sess = radius_server_get_new_session(data, client, msg);
 496                 if (sess == NULL) {
 497                         RADIUS_DEBUG("Could not create a new session");
 498                         radius_server_reject(data, client, msg, from, fromlen,
 499                                              from_addr, from_port);
 500                         return -1;
 501                 }
 502         }
 503
 504         if (sess->last_from_port == from_port &&
 505             sess->last_identifier == msg->hdr->identifier &&
 506             os_memcmp(sess->last_authenticator, msg->hdr->authenticator, 16) ==
 507             0) {
 508                 RADIUS_DEBUG("Duplicate message from %s", from_addr);
 509                 data->counters.dup_access_requests++;
 510                 client->counters.dup_access_requests++;
 511
 512                 if (sess->last_reply) {
 513                         res = sendto(data->auth_sock, sess->last_reply->buf,
 514                                      sess->last_reply->buf_used, 0,
 515                                      (struct sockaddr *) from, fromlen);
 516                         if (res < 0) {
 517                                 perror("sendto[RADIUS SRV]");
 518                         }
 519                         return 0;
 520                 }
 521
 522                 RADIUS_DEBUG("No previous reply available for duplicate "
 523                              "message");
 524                 return -1;
 525         }
 526
 527         eap = radius_msg_get_eap(msg, &eap_len);
 528         if (eap == NULL) {
 529                 RADIUS_DEBUG("No EAP-Message in RADIUS packet from %s",
 530                              from_addr);
 531                 data->counters.packets_dropped++;
 532                 client->counters.packets_dropped++;
 533                 return -1;
 534         }
 535
 536         RADIUS_DUMP("Received EAP data", eap, eap_len);
 537         if (eap_len >= sizeof(*hdr)) {
 538                 hdr = (struct eap_hdr *) eap;
 539                 resp_id = hdr->identifier;
 540         } else {
 541                 resp_id = 0;
 542         }
 543
 544         /* FIX: if Code is Request, Success, or Failure, send Access-Reject;
 545          * RFC3579 Sect. 2.6.2.
 546          * Include EAP-Response/Nak with no preferred method if
 547          * code == request.
 548          * If code is not 1-4, discard the packet silently.
 549          * Or is this already done by the EAP state machine? */
 550
 551         eap_set_eapRespData(sess->eap, eap, eap_len);
 552         free(eap);
 553         eap = NULL;
 554         sess->eapResp = TRUE;
 555         eap_sm_step(sess->eap);
 556
 557         if (sess->eapReqData) {
 558                 RADIUS_DUMP("EAP data from the state machine",
 559                             sess->eapReqData, sess->eapReqDataLen);
 560         } else if (sess->eapFail) {
 561                 RADIUS_DEBUG("No EAP data from the state machine, but eapFail "
 562                              "set - generate EAP-Failure");
 563                 hdr = wpa_zalloc(sizeof(*hdr));
 564                 if (hdr) {
 565                         hdr->identifier = resp_id;
 566                         hdr->length = htons(sizeof(*hdr));
 567                         sess->eapReqData = (u8 *) hdr;
 568                         sess->eapReqDataLen = sizeof(*hdr);
 569                 }
 570         } else if (eap_sm_method_pending(sess->eap)) {
 571                 if (sess->last_msg) {
 572                         radius_msg_free(sess->last_msg);
 573                         free(sess->last_msg);
 574                 }
 575                 sess->last_msg = msg;
 576                 sess->last_from_port = from_port;
 577                 free(sess->last_from_addr);
 578                 sess->last_from_addr = strdup(from_addr);
 579                 sess->last_fromlen = fromlen;
 580                 memcpy(&sess->last_from, from, fromlen);
 581                 return -2;
 582         } else {
 583                 RADIUS_DEBUG("No EAP data from the state machine - ignore this"
 584                              " Access-Request silently (assuming it was a "
 585                              "duplicate)");
 586                 data->counters.packets_dropped++;
 587                 client->counters.packets_dropped++;
 588                 return -1;
 589         }
 590
 591         reply = radius_server_encapsulate_eap(data, client, sess, msg);
 592
 593         free(sess->eapReqData);
 594         sess->eapReqData = NULL;
 595         sess->eapReqDataLen = 0;
 596
 597         if (reply) {
 598                 RADIUS_DEBUG("Reply to %s:%d", from_addr, from_port);
 599                 if (wpa_debug_level <= MSG_MSGDUMP) {
 600                         radius_msg_dump(reply);
 601                 }
 602
 603                 switch (reply->hdr->code) {
 604                 case RADIUS_CODE_ACCESS_ACCEPT:
 605                         data->counters.access_accepts++;
 606                         client->counters.access_accepts++;
 607                         break;
 608                 case RADIUS_CODE_ACCESS_REJECT:
 609                         data->counters.access_rejects++;
 610                         client->counters.access_rejects++;
 611                         break;
 612                 case RADIUS_CODE_ACCESS_CHALLENGE:
 613                         data->counters.access_challenges++;
 614                         client->counters.access_challenges++;
 615                         break;
 616                 }
 617                 res = sendto(data->auth_sock, reply->buf, reply->buf_used, 0,
 618                              (struct sockaddr *) from, fromlen);
 619                 if (res < 0) {
 620                         perror("sendto[RADIUS SRV]");
 621                 }
 622                 if (sess->last_reply) {
 623                         radius_msg_free(sess->last_reply);
 624                         free(sess->last_reply);
 625                 }
 626                 sess->last_reply = reply;
 627                 sess->last_from_port = from_port;
 628                 sess->last_identifier = msg->hdr->identifier;
 629                 os_memcpy(sess->last_authenticator, msg->hdr->authenticator,
 630                           16);
 631         } else {
 632                 data->counters.packets_dropped++;
 633                 client->counters.packets_dropped++;
 634         }
 635
 636         if (sess->eapSuccess || sess->eapFail) {
 637                 RADIUS_DEBUG("Removing completed session 0x%x after timeout",
 638                              sess->sess_id);
 639                 eloop_cancel_timeout(radius_server_session_remove_timeout,
 640                                      data, sess);
 641                 eloop_register_timeout(10, 0,
 642                                        radius_server_session_remove_timeout,
 643                                        data, sess);
 644         }
 645
 646         return 0;
 647 }
 648
 649
 650 static void radius_server_receive_auth(int sock, void *eloop_ctx,
 651                                        void *sock_ctx)
 652 {
 653         struct radius_server_data *data = eloop_ctx;
 654         u8 *buf = NULL;
 655         struct sockaddr_storage from;
 656         socklen_t fromlen;
 657         int len;
 658         struct radius_client *client = NULL;
 659         struct radius_msg *msg = NULL;
 660         char abuf[50];
 661         int from_port = 0;
 662
 663         buf = malloc(RADIUS_MAX_MSG_LEN);
 664         if (buf == NULL) {
 665                 goto fail;
 666         }
 667
 668         fromlen = sizeof(from);
 669         len = recvfrom(sock, buf, RADIUS_MAX_MSG_LEN, 0,
 670                        (struct sockaddr *) &from, &fromlen);
 671         if (len < 0) {
 672                 perror("recvfrom[radius_server]");
 673                 goto fail;
 674         }
 675
 676 #ifdef CONFIG_IPV6
 677         if (data->ipv6) {
 678                 struct sockaddr_in6 *from6 = (struct sockaddr_in6 *) &from;
 679                 if (inet_ntop(AF_INET6, &from6->sin6_addr, abuf, sizeof(abuf))
 680                     == NULL)
 681                         abuf[0] = '\0';
 682                 from_port = ntohs(from6->sin6_port);
 683                 RADIUS_DEBUG("Received %d bytes from %s:%d",
 684                              len, abuf, from_port);
 685
 686                 client = radius_server_get_client(data,
 687                                                   (struct in_addr *)
 688                                                   &from6->sin6_addr, 1);
 689         }
 690 #endif /* CONFIG_IPV6 */
 691
 692         if (!data->ipv6) {
 693                 struct sockaddr_in *from4 = (struct sockaddr_in *) &from;
 694                 snprintf(abuf, sizeof(abuf), "%s", inet_ntoa(from4->sin_addr));
 695                 from_port = ntohs(from4->sin_port);
 696                 RADIUS_DEBUG("Received %d bytes from %s:%d",
 697                              len, abuf, from_port);
 698
 699                 client = radius_server_get_client(data, &from4->sin_addr, 0);
 700         }
 701
 702         RADIUS_DUMP("Received data", buf, len);
 703
 704         if (client == NULL) {
 705                 RADIUS_DEBUG("Unknown client %s - packet ignored", abuf);
 706                 data->counters.invalid_requests++;
 707                 goto fail;
 708         }
 709
 710         msg = radius_msg_parse(buf, len);
 711         if (msg == NULL) {
 712                 RADIUS_DEBUG("Parsing incoming RADIUS frame failed");
 713                 data->counters.malformed_access_requests++;
 714                 client->counters.malformed_access_requests++;
 715                 goto fail;
 716         }
 717
 718         free(buf);
 719         buf = NULL;
 720
 721         if (wpa_debug_level <= MSG_MSGDUMP) {
 722                 radius_msg_dump(msg);
 723         }
 724
 725         if (msg->hdr->code != RADIUS_CODE_ACCESS_REQUEST) {
 726                 RADIUS_DEBUG("Unexpected RADIUS code %d", msg->hdr->code);
 727                 data->counters.unknown_types++;
 728                 client->counters.unknown_types++;
 729                 goto fail;
 730         }
 731
 732         data->counters.access_requests++;
 733         client->counters.access_requests++;
 734
 735         if (radius_msg_verify_msg_auth(msg, (u8 *) client->shared_secret,
 736                                        client->shared_secret_len, NULL)) {
 737                 RADIUS_DEBUG("Invalid Message-Authenticator from %s", abuf);
 738                 data->counters.bad_authenticators++;
 739                 client->counters.bad_authenticators++;
 740                 goto fail;
 741         }
 742
 743         if (radius_server_request(data, msg, (struct sockaddr *) &from,
 744                                   fromlen, client, abuf, from_port, NULL) ==
 745             -2)
 746                 return; /* msg was stored with the session */
 747
 748 fail:
 749         if (msg) {
 750                 radius_msg_free(msg);
 751                 free(msg);
 752         }
 753         free(buf);
 754 }
 755
 756
 757 static int radius_server_open_socket(int port)
 758 {
 759         int s;
 760         struct sockaddr_in addr;
 761
 762         s = socket(PF_INET, SOCK_DGRAM, 0);
 763         if (s < 0) {
 764                 perror("socket");
 765                 return -1;
 766         }
 767
 768         memset(&addr, 0, sizeof(addr));
 769         addr.sin_family = AF_INET;
 770         addr.sin_port = htons(port);
 771         if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 772                 perror("bind");
 773                 close(s);
 774                 return -1;
 775         }
 776
 777         return s;
 778 }
 779
 780
 781 #ifdef CONFIG_IPV6
 782 static int radius_server_open_socket6(int port)
 783 {
 784         int s;
 785         struct sockaddr_in6 addr;
 786
 787         s = socket(PF_INET6, SOCK_DGRAM, 0);
 788         if (s < 0) {
 789                 perror("socket[IPv6]");
 790                 return -1;
 791         }
 792
 793         memset(&addr, 0, sizeof(addr));
 794         addr.sin6_family = AF_INET6;
 795         memcpy(&addr.sin6_addr, &in6addr_any, sizeof(in6addr_any));
 796         addr.sin6_port = htons(port);
 797         if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 798                 perror("bind");
 799                 close(s);
 800                 return -1;
 801         }
 802
 803         return s;
 804 }
 805 #endif /* CONFIG_IPV6 */
 806
 807
 808 static void radius_server_free_sessions(struct radius_server_data *data,
 809                                         struct radius_session *sessions)
 810 {
 811         struct radius_session *session, *prev;
 812
 813         session = sessions;
 814         while (session) {
 815                 prev = session;
 816                 session = session->next;
 817                 radius_server_session_free(data, prev);
 818         }
 819 }
 820
 821
 822 static void radius_server_free_clients(struct radius_server_data *data,
 823                                        struct radius_client *clients)
 824 {
 825         struct radius_client *client, *prev;
 826
 827         client = clients;
 828         while (client) {
 829                 prev = client;
 830                 client = client->next;
 831
 832                 radius_server_free_sessions(data, prev->sessions);
 833                 free(prev->shared_secret);
 834                 free(prev);
 835         }
 836 }
 837
 838
 839 static struct radius_client *
 840 radius_server_read_clients(const char *client_file, int ipv6)
 841 {
 842         FILE *f;
 843         const int buf_size = 1024;
 844         char *buf, *pos;
 845         struct radius_client *clients, *tail, *entry;
 846         int line = 0, mask, failed = 0, i;
 847         struct in_addr addr;
 848 #ifdef CONFIG_IPV6
 849         struct in6_addr addr6;
 850 #endif /* CONFIG_IPV6 */
 851         unsigned int val;
 852
 853         f = fopen(client_file, "r");
 854         if (f == NULL) {
 855                 RADIUS_ERROR("Could not open client file '%s'", client_file);
 856                 return NULL;
 857         }
 858
 859         buf = malloc(buf_size);
 860         if (buf == NULL) {
 861                 fclose(f);
 862                 return NULL;
 863         }
 864
 865         clients = tail = NULL;
 866         while (fgets(buf, buf_size, f)) {
 867                 /* Configuration file format:
 868                  * 192.168.1.0/24 secret
 869                  * 192.168.1.2 secret
 870                  * fe80::211:22ff:fe33:4455/64 secretipv6
 871                  */
 872                 line++;
 873                 buf[buf_size - 1] = '\0';
 874                 pos = buf;
 875                 while (*pos != '\0' && *pos != '\n')
 876                         pos++;
 877                 if (*pos == '\n')
 878                         *pos = '\0';
 879                 if (*buf == '\0' || *buf == '#')
 880                         continue;
 881
 882                 pos = buf;
 883                 while ((*pos >= '0' && *pos <= '9') || *pos == '.' ||
 884                        (*pos >= 'a' && *pos <= 'f') || *pos == ':' ||
 885                        (*pos >= 'A' && *pos <= 'F')) {
 886                         pos++;
 887                 }
 888
 889                 if (*pos == '\0') {
 890                         failed = 1;
 891                         break;
 892                 }
 893
 894                 if (*pos == '/') {
 895                         char *end;
 896                         *pos++ = '\0';
 897                         mask = strtol(pos, &end, 10);
 898                         if ((pos == end) ||
 899                             (mask < 0 || mask > (ipv6 ? 128 : 32))) {
 900                                 failed = 1;
 901                                 break;
 902                         }
 903                         pos = end;
 904                 } else {
 905                         mask = ipv6 ? 128 : 32;
 906                         *pos++ = '\0';
 907                 }
 908
 909                 if (!ipv6 && inet_aton(buf, &addr) == 0) {
 910                         failed = 1;
 911                         break;
 912                 }
 913 #ifdef CONFIG_IPV6
 914                 if (ipv6 && inet_pton(AF_INET6, buf, &addr6) <= 0) {
 915                         if (inet_pton(AF_INET, buf, &addr) <= 0) {
 916                                 failed = 1;
 917                                 break;
 918                         }
 919                         /* Convert IPv4 address to IPv6 */
 920                         if (mask <= 32)
 921                                 mask += (128 - 32);
 922                         memset(addr6.s6_addr, 0, 10);
 923                         addr6.s6_addr[10] = 0xff;
 924                         addr6.s6_addr[11] = 0xff;
 925                         memcpy(addr6.s6_addr + 12, (char *) &addr.s_addr, 4);
 926                 }
 927 #endif /* CONFIG_IPV6 */
 928
 929                 while (*pos == ' ' || *pos == '\t') {
 930                         pos++;
 931                 }
 932
 933                 if (*pos == '\0') {
 934                         failed = 1;
 935                         break;
 936                 }
 937
 938                 entry = wpa_zalloc(sizeof(*entry));
 939                 if (entry == NULL) {
 940                         failed = 1;
 941                         break;
 942                 }
 943                 entry->shared_secret = strdup(pos);
 944                 if (entry->shared_secret == NULL) {
 945                         failed = 1;
 946                         free(entry);
 947                         break;
 948                 }
 949                 entry->shared_secret_len = strlen(entry->shared_secret);
 950                 entry->addr.s_addr = addr.s_addr;
 951                 if (!ipv6) {
 952                         val = 0;
 953                         for (i = 0; i < mask; i++)
 954                                 val |= 1 << (31 - i);
 955                         entry->mask.s_addr = htonl(val);
 956                 }
 957 #ifdef CONFIG_IPV6
 958                 if (ipv6) {
 959                         int offset = mask / 8;
 960
 961                         memcpy(entry->addr6.s6_addr, addr6.s6_addr, 16);
 962                         memset(entry->mask6.s6_addr, 0xff, offset);
 963                         val = 0;
 964                         for (i = 0; i < (mask % 8); i++)
 965                                 val |= 1 << (7 - i);
 966                         if (offset < 16)
 967                                 entry->mask6.s6_addr[offset] = val;
 968                 }
 969 #endif /* CONFIG_IPV6 */
 970
 971                 if (tail == NULL) {
 972                         clients = tail = entry;
 973                 } else {
 974                         tail->next = entry;
 975                         tail = entry;
 976                 }
 977         }
 978
 979         if (failed) {
 980                 RADIUS_ERROR("Invalid line %d in '%s'", line, client_file);
 981                 radius_server_free_clients(NULL, clients);
 982                 clients = NULL;
 983         }
 984
 985         free(buf);
 986         fclose(f);
 987
 988         return clients;
 989 }
 990
 991
 992 struct radius_server_data *
 993 radius_server_init(struct radius_server_conf *conf)
 994 {
 995         struct radius_server_data *data;
 996
 997 #ifndef CONFIG_IPV6
 998         if (conf->ipv6) {
 999                 fprintf(stderr, "RADIUS server compiled without IPv6 "
1000                         "support.\n");
1001                 return NULL;
1002         }
1003 #endif /* CONFIG_IPV6 */
1004
1005         data = wpa_zalloc(sizeof(*data));
1006         if (data == NULL)
1007                 return NULL;
1008
1009         os_get_time(&data->start_time);
1010         data->hostapd_conf = conf->hostapd_conf;
1011         data->eap_sim_db_priv = conf->eap_sim_db_priv;
1012         data->ssl_ctx = conf->ssl_ctx;
1013         data->ipv6 = conf->ipv6;
1014
1015         data->clients = radius_server_read_clients(conf->client_file,
1016                                                    conf->ipv6);
1017         if (data->clients == NULL) {
1018                 printf("No RADIUS clients configured.\n");
1019                 radius_server_deinit(data);
1020                 return NULL;
1021         }
1022
1023 #ifdef CONFIG_IPV6
1024         if (conf->ipv6)
1025                 data->auth_sock = radius_server_open_socket6(conf->auth_port);
1026         else
1027 #endif /* CONFIG_IPV6 */
1028         data->auth_sock = radius_server_open_socket(conf->auth_port);
1029         if (data->auth_sock < 0) {
1030                 printf("Failed to open UDP socket for RADIUS authentication "
1031                        "server\n");
1032                 radius_server_deinit(data);
1033                 return NULL;
1034         }
1035         if (eloop_register_read_sock(data->auth_sock,
1036                                      radius_server_receive_auth,
1037                                      data, NULL)) {
1038                 radius_server_deinit(data);
1039                 return NULL;
1040         }
1041
1042         return data;
1043 }
1044
1045
1046 void radius_server_deinit(struct radius_server_data *data)
1047 {
1048         if (data == NULL)
1049                 return;
1050
1051         if (data->auth_sock >= 0) {
1052                 eloop_unregister_read_sock(data->auth_sock);
1053                 close(data->auth_sock);
1054         }
1055
1056         radius_server_free_clients(data, data->clients);
1057
1058         free(data);
1059 }
1060
1061
1062 int radius_server_get_mib(struct radius_server_data *data, char *buf,
1063                           size_t buflen)
1064 {
1065         int ret, uptime;
1066         unsigned int idx;
1067         char *end, *pos;
1068         struct os_time now;
1069         struct radius_client *cli;
1070
1071         /* RFC 2619 - RADIUS Authentication Server MIB */
1072
1073         if (data == NULL || buflen == 0)
1074                 return 0;
1075
1076         pos = buf;
1077         end = buf + buflen;
1078
1079         os_get_time(&now);
1080         uptime = (now.sec - data->start_time.sec) * 100 +
1081                 ((now.usec - data->start_time.usec) / 10000) % 100;
1082         ret = snprintf(pos, end - pos,
1083                        "RADIUS-AUTH-SERVER-MIB\n"
1084                        "radiusAuthServIdent=hostapd\n"
1085                        "radiusAuthServUpTime=%d\n"
1086                        "radiusAuthServResetTime=0\n"
1087                        "radiusAuthServConfigReset=4\n",
1088                        uptime);
1089         if (ret < 0 || ret >= end - pos) {
1090                 *pos = '\0';
1091                 return pos - buf;
1092         }
1093         pos += ret;
1094
1095         ret = snprintf(pos, end - pos,
1096                        "radiusAuthServTotalAccessRequests=%u\n"
1097                        "radiusAuthServTotalInvalidRequests=%u\n"
1098                        "radiusAuthServTotalDupAccessRequests=%u\n"
1099                        "radiusAuthServTotalAccessAccepts=%u\n"
1100                        "radiusAuthServTotalAccessRejects=%u\n"
1101                        "radiusAuthServTotalAccessChallenges=%u\n"
1102                        "radiusAuthServTotalMalformedAccessRequests=%u\n"
1103                        "radiusAuthServTotalBadAuthenticators=%u\n"
1104                        "radiusAuthServTotalPacketsDropped=%u\n"
1105                        "radiusAuthServTotalUnknownTypes=%u\n",
1106                        data->counters.access_requests,
1107                        data->counters.invalid_requests,
1108                        data->counters.dup_access_requests,
1109                        data->counters.access_accepts,
1110                        data->counters.access_rejects,
1111                        data->counters.access_challenges,
1112                        data->counters.malformed_access_requests,
1113                        data->counters.bad_authenticators,
1114                        data->counters.packets_dropped,
1115                        data->counters.unknown_types);
1116         if (ret < 0 || ret >= end - pos) {
1117                 *pos = '\0';
1118                 return pos - buf;
1119         }
1120         pos += ret;
1121
1122         for (cli = data->clients, idx = 0; cli; cli = cli->next, idx++) {
1123                 char abuf[50], mbuf[50];
1124 #ifdef CONFIG_IPV6
1125                 if (data->ipv6) {
1126                         if (inet_ntop(AF_INET6, &cli->addr6, abuf,
1127                                       sizeof(abuf)) == NULL)
1128                                 abuf[0] = '\0';
1129                         if (inet_ntop(AF_INET6, &cli->mask6, abuf,
1130                                       sizeof(mbuf)) == NULL)
1131                                 mbuf[0] = '\0';
1132                 }
1133 #endif /* CONFIG_IPV6 */
1134                 if (!data->ipv6) {
1135                         snprintf(abuf, sizeof(abuf), "%s",
1136                                  inet_ntoa(cli->addr));
1137                         snprintf(mbuf, sizeof(mbuf), "%s",
1138                                  inet_ntoa(cli->mask));
1139                 }
1140
1141                 ret = snprintf(pos, end - pos,
1142                                "radiusAuthClientIndex=%u\n"
1143                                "radiusAuthClientAddress=%s/%s\n"
1144                                "radiusAuthServAccessRequests=%u\n"
1145                                "radiusAuthServDupAccessRequests=%u\n"
1146                                "radiusAuthServAccessAccepts=%u\n"
1147                                "radiusAuthServAccessRejects=%u\n"
1148                                "radiusAuthServAccessChallenges=%u\n"
1149                                "radiusAuthServMalformedAccessRequests=%u\n"
1150                                "radiusAuthServBadAuthenticators=%u\n"
1151                                "radiusAuthServPacketsDropped=%u\n"
1152                                "radiusAuthServUnknownTypes=%u\n",
1153                                idx,
1154                                abuf, mbuf,
1155                                cli->counters.access_requests,
1156                                cli->counters.dup_access_requests,
1157                                cli->counters.access_accepts,
1158                                cli->counters.access_rejects,
1159                                cli->counters.access_challenges,
1160                                cli->counters.malformed_access_requests,
1161                                cli->counters.bad_authenticators,
1162                                cli->counters.packets_dropped,
1163                                cli->counters.unknown_types);
1164                 if (ret < 0 || ret >= end - pos) {
1165                         *pos = '\0';
1166                         return pos - buf;
1167                 }
1168                 pos += ret;
1169         }
1170
1171         return pos - buf;
1172 }
1173
1174
1175 static Boolean radius_server_get_bool(void *ctx, enum eapol_bool_var variable)
1176 {
1177         struct radius_session *sess = ctx;
1178         if (sess == NULL)
1179                 return FALSE;
1180         switch (variable) {
1181         case EAPOL_eapSuccess:
1182                 return sess->eapSuccess;
1183         case EAPOL_eapRestart:
1184                 return sess->eapRestart;
1185         case EAPOL_eapFail:
1186                 return sess->eapFail;
1187         case EAPOL_eapResp:
1188                 return sess->eapResp;
1189         case EAPOL_eapReq:
1190                 return sess->eapReq;
1191         case EAPOL_eapNoReq:
1192                 return sess->eapNoReq;
1193         case EAPOL_portEnabled:
1194                 return sess->portEnabled;
1195         case EAPOL_eapTimeout:
1196                 return sess->eapTimeout;
1197         }
1198         return FALSE;
1199 }
1200
1201
1202 static void radius_server_set_bool(void *ctx, enum eapol_bool_var variable,
1203                               Boolean value)
1204 {
1205         struct radius_session *sess = ctx;
1206         if (sess == NULL)
1207                 return;
1208         switch (variable) {
1209         case EAPOL_eapSuccess:
1210                 sess->eapSuccess = value;
1211                 break;
1212         case EAPOL_eapRestart:
1213                 sess->eapRestart = value;
1214                 break;
1215         case EAPOL_eapFail:
1216                 sess->eapFail = value;
1217                 break;
1218         case EAPOL_eapResp:
1219                 sess->eapResp = value;
1220                 break;
1221         case EAPOL_eapReq:
1222                 sess->eapReq = value;
1223                 break;
1224         case EAPOL_eapNoReq:
1225                 sess->eapNoReq = value;
1226                 break;
1227         case EAPOL_portEnabled:
1228                 sess->portEnabled = value;
1229                 break;
1230         case EAPOL_eapTimeout:
1231                 sess->eapTimeout = value;
1232                 break;
1233         }
1234 }
1235
1236
1237 static void radius_server_set_eapReqData(void *ctx, const u8 *eapReqData,
1238                                     size_t eapReqDataLen)
1239 {
1240         struct radius_session *sess = ctx;
1241         if (sess == NULL)
1242                 return;
1243
1244         free(sess->eapReqData);
1245         sess->eapReqData = malloc(eapReqDataLen);
1246         if (sess->eapReqData) {
1247                 memcpy(sess->eapReqData, eapReqData, eapReqDataLen);
1248                 sess->eapReqDataLen = eapReqDataLen;
1249         } else {
1250                 sess->eapReqDataLen = 0;
1251         }
1252 }
1253
1254
1255 static void radius_server_set_eapKeyData(void *ctx, const u8 *eapKeyData,
1256                                     size_t eapKeyDataLen)
1257 {
1258         struct radius_session *sess = ctx;
1259
1260         if (sess == NULL)
1261                 return;
1262
1263         free(sess->eapKeyData);
1264         if (eapKeyData) {
1265                 sess->eapKeyData = malloc(eapKeyDataLen);
1266                 if (sess->eapKeyData) {
1267                         memcpy(sess->eapKeyData, eapKeyData, eapKeyDataLen);
1268                         sess->eapKeyDataLen = eapKeyDataLen;
1269                 } else {
1270                         sess->eapKeyDataLen = 0;
1271                 }
1272         } else {
1273                 sess->eapKeyData = NULL;
1274                 sess->eapKeyDataLen = 0;
1275         }
1276 }
1277
1278
1279 static int radius_server_get_eap_user(void *ctx, const u8 *identity,
1280                                       size_t identity_len, int phase2,
1281                                       struct eap_user *user)
1282 {
1283         struct radius_session *sess = ctx;
1284         const struct hostapd_eap_user *eap_user;
1285         int i, count;
1286
1287         eap_user = hostapd_get_eap_user(sess->server->hostapd_conf, identity,
1288                                         identity_len, phase2);
1289         if (eap_user == NULL)
1290                 return -1;
1291
1292         memset(user, 0, sizeof(*user));
1293         count = EAP_USER_MAX_METHODS;
1294         if (count > EAP_MAX_METHODS)
1295                 count = EAP_MAX_METHODS;
1296         for (i = 0; i < count; i++) {
1297                 user->methods[i].vendor = eap_user->methods[i].vendor;
1298                 user->methods[i].method = eap_user->methods[i].method;
1299         }
1300
1301         if (eap_user->password) {
1302                 user->password = malloc(eap_user->password_len);
1303                 if (user->password == NULL)
1304                         return -1;
1305                 memcpy(user->password, eap_user->password,
1306                        eap_user->password_len);
1307                 user->password_len = eap_user->password_len;
1308                 user->password_hash = eap_user->password_hash;
1309         }
1310         user->force_version = eap_user->force_version;
1311
1312         return 0;
1313 }
1314
1315
1316 static struct eapol_callbacks radius_server_eapol_cb =
1317 {
1318         .get_bool = radius_server_get_bool,
1319         .set_bool = radius_server_set_bool,
1320         .set_eapReqData = radius_server_set_eapReqData,
1321         .set_eapKeyData = radius_server_set_eapKeyData,
1322         .get_eap_user = radius_server_get_eap_user,
1323 };
1324
1325
1326 void radius_server_eap_pending_cb(struct radius_server_data *data, void *ctx)
1327 {
1328         struct radius_client *cli;
1329         struct radius_session *s, *sess = NULL;
1330         struct radius_msg *msg;
1331
1332         if (data == NULL)
1333                 return;
1334
1335         for (cli = data->clients; cli; cli = cli->next) {
1336                 for (s = cli->sessions; s; s = s->next) {
1337                         if (s->eap == ctx && s->last_msg) {
1338                                 sess = s;
1339                                 break;
1340                         }
1341                         if (sess)
1342                                 break;
1343                 }
1344                 if (sess)
1345                         break;
1346         }
1347
1348         if (sess == NULL) {
1349                 RADIUS_DEBUG("No session matched callback ctx");
1350                 return;
1351         }
1352
1353         msg = sess->last_msg;
1354         sess->last_msg = NULL;
1355         eap_sm_pending_cb(sess->eap);
1356         if (radius_server_request(data, msg,
1357                                   (struct sockaddr *) &sess->last_from,
1358                                   sess->last_fromlen, cli,
1359                                   sess->last_from_addr,
1360                                   sess->last_from_port, sess) == -2)
1361                 return; /* msg was stored with the session */
1362
1363         radius_msg_free(msg);
1364         free(msg);
1365 }