contrib/wpa/src/radius/radius_server.c

   1 /*
   2  * hostapd / RADIUS authentication server
   3  * Copyright (c) 2005-2008, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16 #include <net/if.h>
  17
  18 #include "common.h"
  19 #include "radius.h"
  20 #include "eloop.h"
  21 #include "defs.h"
  22 #include "eap_server/eap.h"
  23 #include "radius_server.h"
  24
  25 #define RADIUS_SESSION_TIMEOUT 60
  26 #define RADIUS_MAX_SESSION 100
  27 #define RADIUS_MAX_MSG_LEN 3000
  28
  29 static struct eapol_callbacks radius_server_eapol_cb;
  30
  31 struct radius_client;
  32 struct radius_server_data;
  33
  34 struct radius_server_counters {
  35         u32 access_requests;
  36         u32 invalid_requests;
  37         u32 dup_access_requests;
  38         u32 access_accepts;
  39         u32 access_rejects;
  40         u32 access_challenges;
  41         u32 malformed_access_requests;
  42         u32 bad_authenticators;
  43         u32 packets_dropped;
  44         u32 unknown_types;
  45 };
  46
  47 struct radius_session {
  48         struct radius_session *next;
  49         struct radius_client *client;
  50         struct radius_server_data *server;
  51         unsigned int sess_id;
  52         struct eap_sm *eap;
  53         struct eap_eapol_interface *eap_if;
  54
  55         struct radius_msg *last_msg;
  56         char *last_from_addr;
  57         int last_from_port;
  58         struct sockaddr_storage last_from;
  59         socklen_t last_fromlen;
  60         u8 last_identifier;
  61         struct radius_msg *last_reply;
  62         u8 last_authenticator[16];
  63 };
  64
  65 struct radius_client {
  66         struct radius_client *next;
  67         struct in_addr addr;
  68         struct in_addr mask;
  69 #ifdef CONFIG_IPV6
  70         struct in6_addr addr6;
  71         struct in6_addr mask6;
  72 #endif /* CONFIG_IPV6 */
  73         char *shared_secret;
  74         int shared_secret_len;
  75         struct radius_session *sessions;
  76         struct radius_server_counters counters;
  77 };
  78
  79 struct radius_server_data {
  80         int auth_sock;
  81         struct radius_client *clients;
  82         unsigned int next_sess_id;
  83         void *conf_ctx;
  84         int num_sess;
  85         void *eap_sim_db_priv;
  86         void *ssl_ctx;
  87         u8 *pac_opaque_encr_key;
  88         u8 *eap_fast_a_id;
  89         size_t eap_fast_a_id_len;
  90         char *eap_fast_a_id_info;
  91         int eap_fast_prov;
  92         int pac_key_lifetime;
  93         int pac_key_refresh_time;
  94         int eap_sim_aka_result_ind;
  95         int tnc;
  96         struct wps_context *wps;
  97         int ipv6;
  98         struct os_time start_time;
  99         struct radius_server_counters counters;
 100         int (*get_eap_user)(void *ctx, const u8 *identity, size_t identity_len,
 101                             int phase2, struct eap_user *user);
 102         char *eap_req_id_text;
 103         size_t eap_req_id_text_len;
 104 };
 105
 106
 107 extern int wpa_debug_level;
 108
 109 #define RADIUS_DEBUG(args...) \
 110 wpa_printf(MSG_DEBUG, "RADIUS SRV: " args)
 111 #define RADIUS_ERROR(args...) \
 112 wpa_printf(MSG_ERROR, "RADIUS SRV: " args)
 113 #define RADIUS_DUMP(args...) \
 114 wpa_hexdump(MSG_MSGDUMP, "RADIUS SRV: " args)
 115 #define RADIUS_DUMP_ASCII(args...) \
 116 wpa_hexdump_ascii(MSG_MSGDUMP, "RADIUS SRV: " args)
 117
 118
 119 static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx);
 120
 121
 122
 123 static struct radius_client *
 124 radius_server_get_client(struct radius_server_data *data, struct in_addr *addr,
 125                          int ipv6)
 126 {
 127         struct radius_client *client = data->clients;
 128
 129         while (client) {
 130 #ifdef CONFIG_IPV6
 131                 if (ipv6) {
 132                         struct in6_addr *addr6;
 133                         int i;
 134
 135                         addr6 = (struct in6_addr *) addr;
 136                         for (i = 0; i < 16; i++) {
 137                                 if ((addr6->s6_addr[i] &
 138                                      client->mask6.s6_addr[i]) !=
 139                                     (client->addr6.s6_addr[i] &
 140                                      client->mask6.s6_addr[i])) {
 141                                         i = 17;
 142                                         break;
 143                                 }
 144                         }
 145                         if (i == 16) {
 146                                 break;
 147                         }
 148                 }
 149 #endif /* CONFIG_IPV6 */
 150                 if (!ipv6 && (client->addr.s_addr & client->mask.s_addr) ==
 151                     (addr->s_addr & client->mask.s_addr)) {
 152                         break;
 153                 }
 154
 155                 client = client->next;
 156         }
 157
 158         return client;
 159 }
 160
 161
 162 static struct radius_session *
 163 radius_server_get_session(struct radius_client *client, unsigned int sess_id)
 164 {
 165         struct radius_session *sess = client->sessions;
 166
 167         while (sess) {
 168                 if (sess->sess_id == sess_id) {
 169                         break;
 170                 }
 171                 sess = sess->next;
 172         }
 173
 174         return sess;
 175 }
 176
 177
 178 static void radius_server_session_free(struct radius_server_data *data,
 179                                        struct radius_session *sess)
 180 {
 181         eloop_cancel_timeout(radius_server_session_timeout, data, sess);
 182         eap_server_sm_deinit(sess->eap);
 183         if (sess->last_msg) {
 184                 radius_msg_free(sess->last_msg);
 185                 os_free(sess->last_msg);
 186         }
 187         os_free(sess->last_from_addr);
 188         if (sess->last_reply) {
 189                 radius_msg_free(sess->last_reply);
 190                 os_free(sess->last_reply);
 191         }
 192         os_free(sess);
 193         data->num_sess--;
 194 }
 195
 196
 197 static void radius_server_session_remove_timeout(void *eloop_ctx,
 198                                                  void *timeout_ctx);
 199
 200 static void radius_server_session_remove(struct radius_server_data *data,
 201                                          struct radius_session *sess)
 202 {
 203         struct radius_client *client = sess->client;
 204         struct radius_session *session, *prev;
 205
 206         eloop_cancel_timeout(radius_server_session_remove_timeout, data, sess);
 207
 208         prev = NULL;
 209         session = client->sessions;
 210         while (session) {
 211                 if (session == sess) {
 212                         if (prev == NULL) {
 213                                 client->sessions = sess->next;
 214                         } else {
 215                                 prev->next = sess->next;
 216                         }
 217                         radius_server_session_free(data, sess);
 218                         break;
 219                 }
 220                 prev = session;
 221                 session = session->next;
 222         }
 223 }
 224
 225
 226 static void radius_server_session_remove_timeout(void *eloop_ctx,
 227                                                  void *timeout_ctx)
 228 {
 229         struct radius_server_data *data = eloop_ctx;
 230         struct radius_session *sess = timeout_ctx;
 231         RADIUS_DEBUG("Removing completed session 0x%x", sess->sess_id);
 232         radius_server_session_remove(data, sess);
 233 }
 234
 235
 236 static void radius_server_session_timeout(void *eloop_ctx, void *timeout_ctx)
 237 {
 238         struct radius_server_data *data = eloop_ctx;
 239         struct radius_session *sess = timeout_ctx;
 240
 241         RADIUS_DEBUG("Timing out authentication session 0x%x", sess->sess_id);
 242         radius_server_session_remove(data, sess);
 243 }
 244
 245
 246 static struct radius_session *
 247 radius_server_new_session(struct radius_server_data *data,
 248                           struct radius_client *client)
 249 {
 250         struct radius_session *sess;
 251
 252         if (data->num_sess >= RADIUS_MAX_SESSION) {
 253                 RADIUS_DEBUG("Maximum number of existing session - no room "
 254                              "for a new session");
 255                 return NULL;
 256         }
 257
 258         sess = os_zalloc(sizeof(*sess));
 259         if (sess == NULL)
 260                 return NULL;
 261
 262         sess->server = data;
 263         sess->client = client;
 264         sess->sess_id = data->next_sess_id++;
 265         sess->next = client->sessions;
 266         client->sessions = sess;
 267         eloop_register_timeout(RADIUS_SESSION_TIMEOUT, 0,
 268                                radius_server_session_timeout, data, sess);
 269         data->num_sess++;
 270         return sess;
 271 }
 272
 273
 274 static struct radius_session *
 275 radius_server_get_new_session(struct radius_server_data *data,
 276                               struct radius_client *client,
 277                               struct radius_msg *msg)
 278 {
 279         u8 *user;
 280         size_t user_len;
 281         int res;
 282         struct radius_session *sess;
 283         struct eap_config eap_conf;
 284
 285         RADIUS_DEBUG("Creating a new session");
 286
 287         user = os_malloc(256);
 288         if (user == NULL) {
 289                 return NULL;
 290         }
 291         res = radius_msg_get_attr(msg, RADIUS_ATTR_USER_NAME, user, 256);
 292         if (res < 0 || res > 256) {
 293                 RADIUS_DEBUG("Could not get User-Name");
 294                 os_free(user);
 295                 return NULL;
 296         }
 297         user_len = res;
 298         RADIUS_DUMP_ASCII("User-Name", user, user_len);
 299
 300         res = data->get_eap_user(data->conf_ctx, user, user_len, 0, NULL);
 301         os_free(user);
 302
 303         if (res == 0) {
 304                 RADIUS_DEBUG("Matching user entry found");
 305                 sess = radius_server_new_session(data, client);
 306                 if (sess == NULL) {
 307                         RADIUS_DEBUG("Failed to create a new session");
 308                         return NULL;
 309                 }
 310         } else {
 311                 RADIUS_DEBUG("User-Name not found from user database");
 312                 return NULL;
 313         }
 314
 315         os_memset(&eap_conf, 0, sizeof(eap_conf));
 316         eap_conf.ssl_ctx = data->ssl_ctx;
 317         eap_conf.eap_sim_db_priv = data->eap_sim_db_priv;
 318         eap_conf.backend_auth = TRUE;
 319         eap_conf.eap_server = 1;
 320         eap_conf.pac_opaque_encr_key = data->pac_opaque_encr_key;
 321         eap_conf.eap_fast_a_id = data->eap_fast_a_id;
 322         eap_conf.eap_fast_a_id_len = data->eap_fast_a_id_len;
 323         eap_conf.eap_fast_a_id_info = data->eap_fast_a_id_info;
 324         eap_conf.eap_fast_prov = data->eap_fast_prov;
 325         eap_conf.pac_key_lifetime = data->pac_key_lifetime;
 326         eap_conf.pac_key_refresh_time = data->pac_key_refresh_time;
 327         eap_conf.eap_sim_aka_result_ind = data->eap_sim_aka_result_ind;
 328         eap_conf.tnc = data->tnc;
 329         eap_conf.wps = data->wps;
 330         sess->eap = eap_server_sm_init(sess, &radius_server_eapol_cb,
 331                                        &eap_conf);
 332         if (sess->eap == NULL) {
 333                 RADIUS_DEBUG("Failed to initialize EAP state machine for the "
 334                              "new session");
 335                 radius_server_session_free(data, sess);
 336                 return NULL;
 337         }
 338         sess->eap_if = eap_get_interface(sess->eap);
 339         sess->eap_if->eapRestart = TRUE;
 340         sess->eap_if->portEnabled = TRUE;
 341
 342         RADIUS_DEBUG("New session 0x%x initialized", sess->sess_id);
 343
 344         return sess;
 345 }
 346
 347
 348 static struct radius_msg *
 349 radius_server_encapsulate_eap(struct radius_server_data *data,
 350                               struct radius_client *client,
 351                               struct radius_session *sess,
 352                               struct radius_msg *request)
 353 {
 354         struct radius_msg *msg;
 355         int code;
 356         unsigned int sess_id;
 357
 358         if (sess->eap_if->eapFail) {
 359                 sess->eap_if->eapFail = FALSE;
 360                 code = RADIUS_CODE_ACCESS_REJECT;
 361         } else if (sess->eap_if->eapSuccess) {
 362                 sess->eap_if->eapSuccess = FALSE;
 363                 code = RADIUS_CODE_ACCESS_ACCEPT;
 364         } else {
 365                 sess->eap_if->eapReq = FALSE;
 366                 code = RADIUS_CODE_ACCESS_CHALLENGE;
 367         }
 368
 369         msg = radius_msg_new(code, request->hdr->identifier);
 370         if (msg == NULL) {
 371                 RADIUS_DEBUG("Failed to allocate reply message");
 372                 return NULL;
 373         }
 374
 375         sess_id = htonl(sess->sess_id);
 376         if (code == RADIUS_CODE_ACCESS_CHALLENGE &&
 377             !radius_msg_add_attr(msg, RADIUS_ATTR_STATE,
 378                                  (u8 *) &sess_id, sizeof(sess_id))) {
 379                 RADIUS_DEBUG("Failed to add State attribute");
 380         }
 381
 382         if (sess->eap_if->eapReqData &&
 383             !radius_msg_add_eap(msg, wpabuf_head(sess->eap_if->eapReqData),
 384                                 wpabuf_len(sess->eap_if->eapReqData))) {
 385                 RADIUS_DEBUG("Failed to add EAP-Message attribute");
 386         }
 387
 388         if (code == RADIUS_CODE_ACCESS_ACCEPT && sess->eap_if->eapKeyData) {
 389                 int len;
 390                 if (sess->eap_if->eapKeyDataLen > 64) {
 391                         len = 32;
 392                 } else {
 393                         len = sess->eap_if->eapKeyDataLen / 2;
 394                 }
 395                 if (!radius_msg_add_mppe_keys(msg, request->hdr->authenticator,
 396                                               (u8 *) client->shared_secret,
 397                                               client->shared_secret_len,
 398                                               sess->eap_if->eapKeyData + len,
 399                                               len, sess->eap_if->eapKeyData,
 400                                               len)) {
 401                         RADIUS_DEBUG("Failed to add MPPE key attributes");
 402                 }
 403         }
 404
 405         if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) {
 406                 RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)");
 407                 radius_msg_free(msg);
 408                 os_free(msg);
 409                 return NULL;
 410         }
 411
 412         if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret,
 413                                   client->shared_secret_len,
 414                                   request->hdr->authenticator) < 0) {
 415                 RADIUS_DEBUG("Failed to add Message-Authenticator attribute");
 416         }
 417
 418         return msg;
 419 }
 420
 421
 422 static int radius_server_reject(struct radius_server_data *data,
 423                                 struct radius_client *client,
 424                                 struct radius_msg *request,
 425                                 struct sockaddr *from, socklen_t fromlen,
 426                                 const char *from_addr, int from_port)
 427 {
 428         struct radius_msg *msg;
 429         int ret = 0;
 430         struct eap_hdr eapfail;
 431
 432         RADIUS_DEBUG("Reject invalid request from %s:%d",
 433                      from_addr, from_port);
 434
 435         msg = radius_msg_new(RADIUS_CODE_ACCESS_REJECT,
 436                              request->hdr->identifier);
 437         if (msg == NULL) {
 438                 return -1;
 439         }
 440
 441         os_memset(&eapfail, 0, sizeof(eapfail));
 442         eapfail.code = EAP_CODE_FAILURE;
 443         eapfail.identifier = 0;
 444         eapfail.length = host_to_be16(sizeof(eapfail));
 445
 446         if (!radius_msg_add_eap(msg, (u8 *) &eapfail, sizeof(eapfail))) {
 447                 RADIUS_DEBUG("Failed to add EAP-Message attribute");
 448         }
 449
 450         if (radius_msg_copy_attr(msg, request, RADIUS_ATTR_PROXY_STATE) < 0) {
 451                 RADIUS_DEBUG("Failed to copy Proxy-State attribute(s)");
 452                 radius_msg_free(msg);
 453                 os_free(msg);
 454                 return -1;
 455         }
 456
 457         if (radius_msg_finish_srv(msg, (u8 *) client->shared_secret,
 458                                   client->shared_secret_len,
 459                                   request->hdr->authenticator) < 0) {
 460                 RADIUS_DEBUG("Failed to add Message-Authenticator attribute");
 461         }
 462
 463         if (wpa_debug_level <= MSG_MSGDUMP) {
 464                 radius_msg_dump(msg);
 465         }
 466
 467         data->counters.access_rejects++;
 468         client->counters.access_rejects++;
 469         if (sendto(data->auth_sock, msg->buf, msg->buf_used, 0,
 470                    (struct sockaddr *) from, sizeof(*from)) < 0) {
 471                 perror("sendto[RADIUS SRV]");
 472                 ret = -1;
 473         }
 474
 475         radius_msg_free(msg);
 476         os_free(msg);
 477
 478         return ret;
 479 }
 480
 481
 482 static int radius_server_request(struct radius_server_data *data,
 483                                  struct radius_msg *msg,
 484                                  struct sockaddr *from, socklen_t fromlen,
 485                                  struct radius_client *client,
 486                                  const char *from_addr, int from_port,
 487                                  struct radius_session *force_sess)
 488 {
 489         u8 *eap = NULL;
 490         size_t eap_len;
 491         int res, state_included = 0;
 492         u8 statebuf[4];
 493         unsigned int state;
 494         struct radius_session *sess;
 495         struct radius_msg *reply;
 496
 497         if (force_sess)
 498                 sess = force_sess;
 499         else {
 500                 res = radius_msg_get_attr(msg, RADIUS_ATTR_STATE, statebuf,
 501                                           sizeof(statebuf));
 502                 state_included = res >= 0;
 503                 if (res == sizeof(statebuf)) {
 504                         state = WPA_GET_BE32(statebuf);
 505                         sess = radius_server_get_session(client, state);
 506                 } else {
 507                         sess = NULL;
 508                 }
 509         }
 510
 511         if (sess) {
 512                 RADIUS_DEBUG("Request for session 0x%x", sess->sess_id);
 513         } else if (state_included) {
 514                 RADIUS_DEBUG("State attribute included but no session found");
 515                 radius_server_reject(data, client, msg, from, fromlen,
 516                                      from_addr, from_port);
 517                 return -1;
 518         } else {
 519                 sess = radius_server_get_new_session(data, client, msg);
 520                 if (sess == NULL) {
 521                         RADIUS_DEBUG("Could not create a new session");
 522                         radius_server_reject(data, client, msg, from, fromlen,
 523                                              from_addr, from_port);
 524                         return -1;
 525                 }
 526         }
 527
 528         if (sess->last_from_port == from_port &&
 529             sess->last_identifier == msg->hdr->identifier &&
 530             os_memcmp(sess->last_authenticator, msg->hdr->authenticator, 16) ==
 531             0) {
 532                 RADIUS_DEBUG("Duplicate message from %s", from_addr);
 533                 data->counters.dup_access_requests++;
 534                 client->counters.dup_access_requests++;
 535
 536                 if (sess->last_reply) {
 537                         res = sendto(data->auth_sock, sess->last_reply->buf,
 538                                      sess->last_reply->buf_used, 0,
 539                                      (struct sockaddr *) from, fromlen);
 540                         if (res < 0) {
 541                                 perror("sendto[RADIUS SRV]");
 542                         }
 543                         return 0;
 544                 }
 545
 546                 RADIUS_DEBUG("No previous reply available for duplicate "
 547                              "message");
 548                 return -1;
 549         }
 550
 551         eap = radius_msg_get_eap(msg, &eap_len);
 552         if (eap == NULL) {
 553                 RADIUS_DEBUG("No EAP-Message in RADIUS packet from %s",
 554                              from_addr);
 555                 data->counters.packets_dropped++;
 556                 client->counters.packets_dropped++;
 557                 return -1;
 558         }
 559
 560         RADIUS_DUMP("Received EAP data", eap, eap_len);
 561
 562         /* FIX: if Code is Request, Success, or Failure, send Access-Reject;
 563          * RFC3579 Sect. 2.6.2.
 564          * Include EAP-Response/Nak with no preferred method if
 565          * code == request.
 566          * If code is not 1-4, discard the packet silently.
 567          * Or is this already done by the EAP state machine? */
 568
 569         wpabuf_free(sess->eap_if->eapRespData);
 570         sess->eap_if->eapRespData = wpabuf_alloc_ext_data(eap, eap_len);
 571         if (sess->eap_if->eapRespData == NULL)
 572                 os_free(eap);
 573         eap = NULL;
 574         sess->eap_if->eapResp = TRUE;
 575         eap_server_sm_step(sess->eap);
 576
 577         if ((sess->eap_if->eapReq || sess->eap_if->eapSuccess ||
 578              sess->eap_if->eapFail) && sess->eap_if->eapReqData) {
 579                 RADIUS_DUMP("EAP data from the state machine",
 580                             wpabuf_head(sess->eap_if->eapReqData),
 581                             wpabuf_len(sess->eap_if->eapReqData));
 582         } else if (sess->eap_if->eapFail) {
 583                 RADIUS_DEBUG("No EAP data from the state machine, but eapFail "
 584                              "set");
 585         } else if (eap_sm_method_pending(sess->eap)) {
 586                 if (sess->last_msg) {
 587                         radius_msg_free(sess->last_msg);
 588                         os_free(sess->last_msg);
 589                 }
 590                 sess->last_msg = msg;
 591                 sess->last_from_port = from_port;
 592                 os_free(sess->last_from_addr);
 593                 sess->last_from_addr = os_strdup(from_addr);
 594                 sess->last_fromlen = fromlen;
 595                 os_memcpy(&sess->last_from, from, fromlen);
 596                 return -2;
 597         } else {
 598                 RADIUS_DEBUG("No EAP data from the state machine - ignore this"
 599                              " Access-Request silently (assuming it was a "
 600                              "duplicate)");
 601                 data->counters.packets_dropped++;
 602                 client->counters.packets_dropped++;
 603                 return -1;
 604         }
 605
 606         reply = radius_server_encapsulate_eap(data, client, sess, msg);
 607
 608         if (reply) {
 609                 RADIUS_DEBUG("Reply to %s:%d", from_addr, from_port);
 610                 if (wpa_debug_level <= MSG_MSGDUMP) {
 611                         radius_msg_dump(reply);
 612                 }
 613
 614                 switch (reply->hdr->code) {
 615                 case RADIUS_CODE_ACCESS_ACCEPT:
 616                         data->counters.access_accepts++;
 617                         client->counters.access_accepts++;
 618                         break;
 619                 case RADIUS_CODE_ACCESS_REJECT:
 620                         data->counters.access_rejects++;
 621                         client->counters.access_rejects++;
 622                         break;
 623                 case RADIUS_CODE_ACCESS_CHALLENGE:
 624                         data->counters.access_challenges++;
 625                         client->counters.access_challenges++;
 626                         break;
 627                 }
 628                 res = sendto(data->auth_sock, reply->buf, reply->buf_used, 0,
 629                              (struct sockaddr *) from, fromlen);
 630                 if (res < 0) {
 631                         perror("sendto[RADIUS SRV]");
 632                 }
 633                 if (sess->last_reply) {
 634                         radius_msg_free(sess->last_reply);
 635                         os_free(sess->last_reply);
 636                 }
 637                 sess->last_reply = reply;
 638                 sess->last_from_port = from_port;
 639                 sess->last_identifier = msg->hdr->identifier;
 640                 os_memcpy(sess->last_authenticator, msg->hdr->authenticator,
 641                           16);
 642         } else {
 643                 data->counters.packets_dropped++;
 644                 client->counters.packets_dropped++;
 645         }
 646
 647         if (sess->eap_if->eapSuccess || sess->eap_if->eapFail) {
 648                 RADIUS_DEBUG("Removing completed session 0x%x after timeout",
 649                              sess->sess_id);
 650                 eloop_cancel_timeout(radius_server_session_remove_timeout,
 651                                      data, sess);
 652                 eloop_register_timeout(10, 0,
 653                                        radius_server_session_remove_timeout,
 654                                        data, sess);
 655         }
 656
 657         return 0;
 658 }
 659
 660
 661 static void radius_server_receive_auth(int sock, void *eloop_ctx,
 662                                        void *sock_ctx)
 663 {
 664         struct radius_server_data *data = eloop_ctx;
 665         u8 *buf = NULL;
 666         struct sockaddr_storage from;
 667         socklen_t fromlen;
 668         int len;
 669         struct radius_client *client = NULL;
 670         struct radius_msg *msg = NULL;
 671         char abuf[50];
 672         int from_port = 0;
 673
 674         buf = os_malloc(RADIUS_MAX_MSG_LEN);
 675         if (buf == NULL) {
 676                 goto fail;
 677         }
 678
 679         fromlen = sizeof(from);
 680         len = recvfrom(sock, buf, RADIUS_MAX_MSG_LEN, 0,
 681                        (struct sockaddr *) &from, &fromlen);
 682         if (len < 0) {
 683                 perror("recvfrom[radius_server]");
 684                 goto fail;
 685         }
 686
 687 #ifdef CONFIG_IPV6
 688         if (data->ipv6) {
 689                 struct sockaddr_in6 *from6 = (struct sockaddr_in6 *) &from;
 690                 if (inet_ntop(AF_INET6, &from6->sin6_addr, abuf, sizeof(abuf))
 691                     == NULL)
 692                         abuf[0] = '\0';
 693                 from_port = ntohs(from6->sin6_port);
 694                 RADIUS_DEBUG("Received %d bytes from %s:%d",
 695                              len, abuf, from_port);
 696
 697                 client = radius_server_get_client(data,
 698                                                   (struct in_addr *)
 699                                                   &from6->sin6_addr, 1);
 700         }
 701 #endif /* CONFIG_IPV6 */
 702
 703         if (!data->ipv6) {
 704                 struct sockaddr_in *from4 = (struct sockaddr_in *) &from;
 705                 os_strlcpy(abuf, inet_ntoa(from4->sin_addr), sizeof(abuf));
 706                 from_port = ntohs(from4->sin_port);
 707                 RADIUS_DEBUG("Received %d bytes from %s:%d",
 708                              len, abuf, from_port);
 709
 710                 client = radius_server_get_client(data, &from4->sin_addr, 0);
 711         }
 712
 713         RADIUS_DUMP("Received data", buf, len);
 714
 715         if (client == NULL) {
 716                 RADIUS_DEBUG("Unknown client %s - packet ignored", abuf);
 717                 data->counters.invalid_requests++;
 718                 goto fail;
 719         }
 720
 721         msg = radius_msg_parse(buf, len);
 722         if (msg == NULL) {
 723                 RADIUS_DEBUG("Parsing incoming RADIUS frame failed");
 724                 data->counters.malformed_access_requests++;
 725                 client->counters.malformed_access_requests++;
 726                 goto fail;
 727         }
 728
 729         os_free(buf);
 730         buf = NULL;
 731
 732         if (wpa_debug_level <= MSG_MSGDUMP) {
 733                 radius_msg_dump(msg);
 734         }
 735
 736         if (msg->hdr->code != RADIUS_CODE_ACCESS_REQUEST) {
 737                 RADIUS_DEBUG("Unexpected RADIUS code %d", msg->hdr->code);
 738                 data->counters.unknown_types++;
 739                 client->counters.unknown_types++;
 740                 goto fail;
 741         }
 742
 743         data->counters.access_requests++;
 744         client->counters.access_requests++;
 745
 746         if (radius_msg_verify_msg_auth(msg, (u8 *) client->shared_secret,
 747                                        client->shared_secret_len, NULL)) {
 748                 RADIUS_DEBUG("Invalid Message-Authenticator from %s", abuf);
 749                 data->counters.bad_authenticators++;
 750                 client->counters.bad_authenticators++;
 751                 goto fail;
 752         }
 753
 754         if (radius_server_request(data, msg, (struct sockaddr *) &from,
 755                                   fromlen, client, abuf, from_port, NULL) ==
 756             -2)
 757                 return; /* msg was stored with the session */
 758
 759 fail:
 760         if (msg) {
 761                 radius_msg_free(msg);
 762                 os_free(msg);
 763         }
 764         os_free(buf);
 765 }
 766
 767
 768 static int radius_server_open_socket(int port)
 769 {
 770         int s;
 771         struct sockaddr_in addr;
 772
 773         s = socket(PF_INET, SOCK_DGRAM, 0);
 774         if (s < 0) {
 775                 perror("socket");
 776                 return -1;
 777         }
 778
 779         os_memset(&addr, 0, sizeof(addr));
 780         addr.sin_family = AF_INET;
 781         addr.sin_port = htons(port);
 782         if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 783                 perror("bind");
 784                 close(s);
 785                 return -1;
 786         }
 787
 788         return s;
 789 }
 790
 791
 792 #ifdef CONFIG_IPV6
 793 static int radius_server_open_socket6(int port)
 794 {
 795         int s;
 796         struct sockaddr_in6 addr;
 797
 798         s = socket(PF_INET6, SOCK_DGRAM, 0);
 799         if (s < 0) {
 800                 perror("socket[IPv6]");
 801                 return -1;
 802         }
 803
 804         os_memset(&addr, 0, sizeof(addr));
 805         addr.sin6_family = AF_INET6;
 806         os_memcpy(&addr.sin6_addr, &in6addr_any, sizeof(in6addr_any));
 807         addr.sin6_port = htons(port);
 808         if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 809                 perror("bind");
 810                 close(s);
 811                 return -1;
 812         }
 813
 814         return s;
 815 }
 816 #endif /* CONFIG_IPV6 */
 817
 818
 819 static void radius_server_free_sessions(struct radius_server_data *data,
 820                                         struct radius_session *sessions)
 821 {
 822         struct radius_session *session, *prev;
 823
 824         session = sessions;
 825         while (session) {
 826                 prev = session;
 827                 session = session->next;
 828                 radius_server_session_free(data, prev);
 829         }
 830 }
 831
 832
 833 static void radius_server_free_clients(struct radius_server_data *data,
 834                                        struct radius_client *clients)
 835 {
 836         struct radius_client *client, *prev;
 837
 838         client = clients;
 839         while (client) {
 840                 prev = client;
 841                 client = client->next;
 842
 843                 radius_server_free_sessions(data, prev->sessions);
 844                 os_free(prev->shared_secret);
 845                 os_free(prev);
 846         }
 847 }
 848
 849
 850 static struct radius_client *
 851 radius_server_read_clients(const char *client_file, int ipv6)
 852 {
 853         FILE *f;
 854         const int buf_size = 1024;
 855         char *buf, *pos;
 856         struct radius_client *clients, *tail, *entry;
 857         int line = 0, mask, failed = 0, i;
 858         struct in_addr addr;
 859 #ifdef CONFIG_IPV6
 860         struct in6_addr addr6;
 861 #endif /* CONFIG_IPV6 */
 862         unsigned int val;
 863
 864         f = fopen(client_file, "r");
 865         if (f == NULL) {
 866                 RADIUS_ERROR("Could not open client file '%s'", client_file);
 867                 return NULL;
 868         }
 869
 870         buf = os_malloc(buf_size);
 871         if (buf == NULL) {
 872                 fclose(f);
 873                 return NULL;
 874         }
 875
 876         clients = tail = NULL;
 877         while (fgets(buf, buf_size, f)) {
 878                 /* Configuration file format:
 879                  * 192.168.1.0/24 secret
 880                  * 192.168.1.2 secret
 881                  * fe80::211:22ff:fe33:4455/64 secretipv6
 882                  */
 883                 line++;
 884                 buf[buf_size - 1] = '\0';
 885                 pos = buf;
 886                 while (*pos != '\0' && *pos != '\n')
 887                         pos++;
 888                 if (*pos == '\n')
 889                         *pos = '\0';
 890                 if (*buf == '\0' || *buf == '#')
 891                         continue;
 892
 893                 pos = buf;
 894                 while ((*pos >= '0' && *pos <= '9') || *pos == '.' ||
 895                        (*pos >= 'a' && *pos <= 'f') || *pos == ':' ||
 896                        (*pos >= 'A' && *pos <= 'F')) {
 897                         pos++;
 898                 }
 899
 900                 if (*pos == '\0') {
 901                         failed = 1;
 902                         break;
 903                 }
 904
 905                 if (*pos == '/') {
 906                         char *end;
 907                         *pos++ = '\0';
 908                         mask = strtol(pos, &end, 10);
 909                         if ((pos == end) ||
 910                             (mask < 0 || mask > (ipv6 ? 128 : 32))) {
 911                                 failed = 1;
 912                                 break;
 913                         }
 914                         pos = end;
 915                 } else {
 916                         mask = ipv6 ? 128 : 32;
 917                         *pos++ = '\0';
 918                 }
 919
 920                 if (!ipv6 && inet_aton(buf, &addr) == 0) {
 921                         failed = 1;
 922                         break;
 923                 }
 924 #ifdef CONFIG_IPV6
 925                 if (ipv6 && inet_pton(AF_INET6, buf, &addr6) <= 0) {
 926                         if (inet_pton(AF_INET, buf, &addr) <= 0) {
 927                                 failed = 1;
 928                                 break;
 929                         }
 930                         /* Convert IPv4 address to IPv6 */
 931                         if (mask <= 32)
 932                                 mask += (128 - 32);
 933                         os_memset(addr6.s6_addr, 0, 10);
 934                         addr6.s6_addr[10] = 0xff;
 935                         addr6.s6_addr[11] = 0xff;
 936                         os_memcpy(addr6.s6_addr + 12, (char *) &addr.s_addr,
 937                                   4);
 938                 }
 939 #endif /* CONFIG_IPV6 */
 940
 941                 while (*pos == ' ' || *pos == '\t') {
 942                         pos++;
 943                 }
 944
 945                 if (*pos == '\0') {
 946                         failed = 1;
 947                         break;
 948                 }
 949
 950                 entry = os_zalloc(sizeof(*entry));
 951                 if (entry == NULL) {
 952                         failed = 1;
 953                         break;
 954                 }
 955                 entry->shared_secret = os_strdup(pos);
 956                 if (entry->shared_secret == NULL) {
 957                         failed = 1;
 958                         os_free(entry);
 959                         break;
 960                 }
 961                 entry->shared_secret_len = os_strlen(entry->shared_secret);
 962                 entry->addr.s_addr = addr.s_addr;
 963                 if (!ipv6) {
 964                         val = 0;
 965                         for (i = 0; i < mask; i++)
 966                                 val |= 1 << (31 - i);
 967                         entry->mask.s_addr = htonl(val);
 968                 }
 969 #ifdef CONFIG_IPV6
 970                 if (ipv6) {
 971                         int offset = mask / 8;
 972
 973                         os_memcpy(entry->addr6.s6_addr, addr6.s6_addr, 16);
 974                         os_memset(entry->mask6.s6_addr, 0xff, offset);
 975                         val = 0;
 976                         for (i = 0; i < (mask % 8); i++)
 977                                 val |= 1 << (7 - i);
 978                         if (offset < 16)
 979                                 entry->mask6.s6_addr[offset] = val;
 980                 }
 981 #endif /* CONFIG_IPV6 */
 982
 983                 if (tail == NULL) {
 984                         clients = tail = entry;
 985                 } else {
 986                         tail->next = entry;
 987                         tail = entry;
 988                 }
 989         }
 990
 991         if (failed) {
 992                 RADIUS_ERROR("Invalid line %d in '%s'", line, client_file);
 993                 radius_server_free_clients(NULL, clients);
 994                 clients = NULL;
 995         }
 996
 997         os_free(buf);
 998         fclose(f);
 999
1000         return clients;
1001 }
1002
1003
1004 struct radius_server_data *
1005 radius_server_init(struct radius_server_conf *conf)
1006 {
1007         struct radius_server_data *data;
1008
1009 #ifndef CONFIG_IPV6
1010         if (conf->ipv6) {
1011                 fprintf(stderr, "RADIUS server compiled without IPv6 "
1012                         "support.\n");
1013                 return NULL;
1014         }
1015 #endif /* CONFIG_IPV6 */
1016
1017         data = os_zalloc(sizeof(*data));
1018         if (data == NULL)
1019                 return NULL;
1020
1021         os_get_time(&data->start_time);
1022         data->conf_ctx = conf->conf_ctx;
1023         data->eap_sim_db_priv = conf->eap_sim_db_priv;
1024         data->ssl_ctx = conf->ssl_ctx;
1025         data->ipv6 = conf->ipv6;
1026         if (conf->pac_opaque_encr_key) {
1027                 data->pac_opaque_encr_key = os_malloc(16);
1028                 os_memcpy(data->pac_opaque_encr_key, conf->pac_opaque_encr_key,
1029                           16);
1030         }
1031         if (conf->eap_fast_a_id) {
1032                 data->eap_fast_a_id = os_malloc(conf->eap_fast_a_id_len);
1033                 if (data->eap_fast_a_id) {
1034                         os_memcpy(data->eap_fast_a_id, conf->eap_fast_a_id,
1035                                   conf->eap_fast_a_id_len);
1036                         data->eap_fast_a_id_len = conf->eap_fast_a_id_len;
1037                 }
1038         }
1039         if (conf->eap_fast_a_id_info)
1040                 data->eap_fast_a_id_info = os_strdup(conf->eap_fast_a_id_info);
1041         data->eap_fast_prov = conf->eap_fast_prov;
1042         data->pac_key_lifetime = conf->pac_key_lifetime;
1043         data->pac_key_refresh_time = conf->pac_key_refresh_time;
1044         data->get_eap_user = conf->get_eap_user;
1045         data->eap_sim_aka_result_ind = conf->eap_sim_aka_result_ind;
1046         data->tnc = conf->tnc;
1047         data->wps = conf->wps;
1048         if (conf->eap_req_id_text) {
1049                 data->eap_req_id_text = os_malloc(conf->eap_req_id_text_len);
1050                 if (data->eap_req_id_text) {
1051                         os_memcpy(data->eap_req_id_text, conf->eap_req_id_text,
1052                                   conf->eap_req_id_text_len);
1053                         data->eap_req_id_text_len = conf->eap_req_id_text_len;
1054                 }
1055         }
1056
1057         data->clients = radius_server_read_clients(conf->client_file,
1058                                                    conf->ipv6);
1059         if (data->clients == NULL) {
1060                 printf("No RADIUS clients configured.\n");
1061                 radius_server_deinit(data);
1062                 return NULL;
1063         }
1064
1065 #ifdef CONFIG_IPV6
1066         if (conf->ipv6)
1067                 data->auth_sock = radius_server_open_socket6(conf->auth_port);
1068         else
1069 #endif /* CONFIG_IPV6 */
1070         data->auth_sock = radius_server_open_socket(conf->auth_port);
1071         if (data->auth_sock < 0) {
1072                 printf("Failed to open UDP socket for RADIUS authentication "
1073                        "server\n");
1074                 radius_server_deinit(data);
1075                 return NULL;
1076         }
1077         if (eloop_register_read_sock(data->auth_sock,
1078                                      radius_server_receive_auth,
1079                                      data, NULL)) {
1080                 radius_server_deinit(data);
1081                 return NULL;
1082         }
1083
1084         return data;
1085 }
1086
1087
1088 void radius_server_deinit(struct radius_server_data *data)
1089 {
1090         if (data == NULL)
1091                 return;
1092
1093         if (data->auth_sock >= 0) {
1094                 eloop_unregister_read_sock(data->auth_sock);
1095                 close(data->auth_sock);
1096         }
1097
1098         radius_server_free_clients(data, data->clients);
1099
1100         os_free(data->pac_opaque_encr_key);
1101         os_free(data->eap_fast_a_id);
1102         os_free(data->eap_fast_a_id_info);
1103         os_free(data->eap_req_id_text);
1104         os_free(data);
1105 }
1106
1107
1108 int radius_server_get_mib(struct radius_server_data *data, char *buf,
1109                           size_t buflen)
1110 {
1111         int ret, uptime;
1112         unsigned int idx;
1113         char *end, *pos;
1114         struct os_time now;
1115         struct radius_client *cli;
1116
1117         /* RFC 2619 - RADIUS Authentication Server MIB */
1118
1119         if (data == NULL || buflen == 0)
1120                 return 0;
1121
1122         pos = buf;
1123         end = buf + buflen;
1124
1125         os_get_time(&now);
1126         uptime = (now.sec - data->start_time.sec) * 100 +
1127                 ((now.usec - data->start_time.usec) / 10000) % 100;
1128         ret = os_snprintf(pos, end - pos,
1129                           "RADIUS-AUTH-SERVER-MIB\n"
1130                           "radiusAuthServIdent=hostapd\n"
1131                           "radiusAuthServUpTime=%d\n"
1132                           "radiusAuthServResetTime=0\n"
1133                           "radiusAuthServConfigReset=4\n",
1134                           uptime);
1135         if (ret < 0 || ret >= end - pos) {
1136                 *pos = '\0';
1137                 return pos - buf;
1138         }
1139         pos += ret;
1140
1141         ret = os_snprintf(pos, end - pos,
1142                           "radiusAuthServTotalAccessRequests=%u\n"
1143                           "radiusAuthServTotalInvalidRequests=%u\n"
1144                           "radiusAuthServTotalDupAccessRequests=%u\n"
1145                           "radiusAuthServTotalAccessAccepts=%u\n"
1146                           "radiusAuthServTotalAccessRejects=%u\n"
1147                           "radiusAuthServTotalAccessChallenges=%u\n"
1148                           "radiusAuthServTotalMalformedAccessRequests=%u\n"
1149                           "radiusAuthServTotalBadAuthenticators=%u\n"
1150                           "radiusAuthServTotalPacketsDropped=%u\n"
1151                           "radiusAuthServTotalUnknownTypes=%u\n",
1152                           data->counters.access_requests,
1153                           data->counters.invalid_requests,
1154                           data->counters.dup_access_requests,
1155                           data->counters.access_accepts,
1156                           data->counters.access_rejects,
1157                           data->counters.access_challenges,
1158                           data->counters.malformed_access_requests,
1159                           data->counters.bad_authenticators,
1160                           data->counters.packets_dropped,
1161                           data->counters.unknown_types);
1162         if (ret < 0 || ret >= end - pos) {
1163                 *pos = '\0';
1164                 return pos - buf;
1165         }
1166         pos += ret;
1167
1168         for (cli = data->clients, idx = 0; cli; cli = cli->next, idx++) {
1169                 char abuf[50], mbuf[50];
1170 #ifdef CONFIG_IPV6
1171                 if (data->ipv6) {
1172                         if (inet_ntop(AF_INET6, &cli->addr6, abuf,
1173                                       sizeof(abuf)) == NULL)
1174                                 abuf[0] = '\0';
1175                         if (inet_ntop(AF_INET6, &cli->mask6, abuf,
1176                                       sizeof(mbuf)) == NULL)
1177                                 mbuf[0] = '\0';
1178                 }
1179 #endif /* CONFIG_IPV6 */
1180                 if (!data->ipv6) {
1181                         os_strlcpy(abuf, inet_ntoa(cli->addr), sizeof(abuf));
1182                         os_strlcpy(mbuf, inet_ntoa(cli->mask), sizeof(mbuf));
1183                 }
1184
1185                 ret = os_snprintf(pos, end - pos,
1186                                   "radiusAuthClientIndex=%u\n"
1187                                   "radiusAuthClientAddress=%s/%s\n"
1188                                   "radiusAuthServAccessRequests=%u\n"
1189                                   "radiusAuthServDupAccessRequests=%u\n"
1190                                   "radiusAuthServAccessAccepts=%u\n"
1191                                   "radiusAuthServAccessRejects=%u\n"
1192                                   "radiusAuthServAccessChallenges=%u\n"
1193                                   "radiusAuthServMalformedAccessRequests=%u\n"
1194                                   "radiusAuthServBadAuthenticators=%u\n"
1195                                   "radiusAuthServPacketsDropped=%u\n"
1196                                   "radiusAuthServUnknownTypes=%u\n",
1197                                   idx,
1198                                   abuf, mbuf,
1199                                   cli->counters.access_requests,
1200                                   cli->counters.dup_access_requests,
1201                                   cli->counters.access_accepts,
1202                                   cli->counters.access_rejects,
1203                                   cli->counters.access_challenges,
1204                                   cli->counters.malformed_access_requests,
1205                                   cli->counters.bad_authenticators,
1206                                   cli->counters.packets_dropped,
1207                                   cli->counters.unknown_types);
1208                 if (ret < 0 || ret >= end - pos) {
1209                         *pos = '\0';
1210                         return pos - buf;
1211                 }
1212                 pos += ret;
1213         }
1214
1215         return pos - buf;
1216 }
1217
1218
1219 static int radius_server_get_eap_user(void *ctx, const u8 *identity,
1220                                       size_t identity_len, int phase2,
1221                                       struct eap_user *user)
1222 {
1223         struct radius_session *sess = ctx;
1224         struct radius_server_data *data = sess->server;
1225
1226         return data->get_eap_user(data->conf_ctx, identity, identity_len,
1227                                   phase2, user);
1228 }
1229
1230
1231 static const char * radius_server_get_eap_req_id_text(void *ctx, size_t *len)
1232 {
1233         struct radius_session *sess = ctx;
1234         struct radius_server_data *data = sess->server;
1235         *len = data->eap_req_id_text_len;
1236         return data->eap_req_id_text;
1237 }
1238
1239
1240 static struct eapol_callbacks radius_server_eapol_cb =
1241 {
1242         .get_eap_user = radius_server_get_eap_user,
1243         .get_eap_req_id_text = radius_server_get_eap_req_id_text,
1244 };
1245
1246
1247 void radius_server_eap_pending_cb(struct radius_server_data *data, void *ctx)
1248 {
1249         struct radius_client *cli;
1250         struct radius_session *s, *sess = NULL;
1251         struct radius_msg *msg;
1252
1253         if (data == NULL)
1254                 return;
1255
1256         for (cli = data->clients; cli; cli = cli->next) {
1257                 for (s = cli->sessions; s; s = s->next) {
1258                         if (s->eap == ctx && s->last_msg) {
1259                                 sess = s;
1260                                 break;
1261                         }
1262                         if (sess)
1263                                 break;
1264                 }
1265                 if (sess)
1266                         break;
1267         }
1268
1269         if (sess == NULL) {
1270                 RADIUS_DEBUG("No session matched callback ctx");
1271                 return;
1272         }
1273
1274         msg = sess->last_msg;
1275         sess->last_msg = NULL;
1276         eap_sm_pending_cb(sess->eap);
1277         if (radius_server_request(data, msg,
1278                                   (struct sockaddr *) &sess->last_from,
1279                                   sess->last_fromlen, cli,
1280                                   sess->last_from_addr,
1281                                   sess->last_from_port, sess) == -2)
1282                 return; /* msg was stored with the session */
1283
1284         radius_msg_free(msg);
1285         os_free(msg);
1286 }