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         int is_complete = 0;
 497
 498         if (force_sess)
 499                 sess = force_sess;
 500         else {
 501                 res = radius_msg_get_attr(msg, RADIUS_ATTR_STATE, statebuf,
 502                                           sizeof(statebuf));
 503                 state_included = res >= 0;
 504                 if (res == sizeof(statebuf)) {
 505                         state = WPA_GET_BE32(statebuf);
 506                         sess = radius_server_get_session(client, state);
 507                 } else {
 508                         sess = NULL;
 509                 }
 510         }
 511
 512         if (sess) {
 513                 RADIUS_DEBUG("Request for session 0x%x", sess->sess_id);
 514         } else if (state_included) {
 515                 RADIUS_DEBUG("State attribute included but no session found");
 516                 radius_server_reject(data, client, msg, from, fromlen,
 517                                      from_addr, from_port);
 518                 return -1;
 519         } else {
 520                 sess = radius_server_get_new_session(data, client, msg);
 521                 if (sess == NULL) {
 522                         RADIUS_DEBUG("Could not create a new session");
 523                         radius_server_reject(data, client, msg, from, fromlen,
 524                                              from_addr, from_port);
 525                         return -1;
 526                 }
 527         }
 528
 529         if (sess->last_from_port == from_port &&
 530             sess->last_identifier == msg->hdr->identifier &&
 531             os_memcmp(sess->last_authenticator, msg->hdr->authenticator, 16) ==
 532             0) {
 533                 RADIUS_DEBUG("Duplicate message from %s", from_addr);
 534                 data->counters.dup_access_requests++;
 535                 client->counters.dup_access_requests++;
 536
 537                 if (sess->last_reply) {
 538                         res = sendto(data->auth_sock, sess->last_reply->buf,
 539                                      sess->last_reply->buf_used, 0,
 540                                      (struct sockaddr *) from, fromlen);
 541                         if (res < 0) {
 542                                 perror("sendto[RADIUS SRV]");
 543                         }
 544                         return 0;
 545                 }
 546
 547                 RADIUS_DEBUG("No previous reply available for duplicate "
 548                              "message");
 549                 return -1;
 550         }
 551
 552         eap = radius_msg_get_eap(msg, &eap_len);
 553         if (eap == NULL) {
 554                 RADIUS_DEBUG("No EAP-Message in RADIUS packet from %s",
 555                              from_addr);
 556                 data->counters.packets_dropped++;
 557                 client->counters.packets_dropped++;
 558                 return -1;
 559         }
 560
 561         RADIUS_DUMP("Received EAP data", eap, eap_len);
 562
 563         /* FIX: if Code is Request, Success, or Failure, send Access-Reject;
 564          * RFC3579 Sect. 2.6.2.
 565          * Include EAP-Response/Nak with no preferred method if
 566          * code == request.
 567          * If code is not 1-4, discard the packet silently.
 568          * Or is this already done by the EAP state machine? */
 569
 570         wpabuf_free(sess->eap_if->eapRespData);
 571         sess->eap_if->eapRespData = wpabuf_alloc_ext_data(eap, eap_len);
 572         if (sess->eap_if->eapRespData == NULL)
 573                 os_free(eap);
 574         eap = NULL;
 575         sess->eap_if->eapResp = TRUE;
 576         eap_server_sm_step(sess->eap);
 577
 578         if ((sess->eap_if->eapReq || sess->eap_if->eapSuccess ||
 579              sess->eap_if->eapFail) && sess->eap_if->eapReqData) {
 580                 RADIUS_DUMP("EAP data from the state machine",
 581                             wpabuf_head(sess->eap_if->eapReqData),
 582                             wpabuf_len(sess->eap_if->eapReqData));
 583         } else if (sess->eap_if->eapFail) {
 584                 RADIUS_DEBUG("No EAP data from the state machine, but eapFail "
 585                              "set");
 586         } else if (eap_sm_method_pending(sess->eap)) {
 587                 if (sess->last_msg) {
 588                         radius_msg_free(sess->last_msg);
 589                         os_free(sess->last_msg);
 590                 }
 591                 sess->last_msg = msg;
 592                 sess->last_from_port = from_port;
 593                 os_free(sess->last_from_addr);
 594                 sess->last_from_addr = os_strdup(from_addr);
 595                 sess->last_fromlen = fromlen;
 596                 os_memcpy(&sess->last_from, from, fromlen);
 597                 return -2;
 598         } else {
 599                 RADIUS_DEBUG("No EAP data from the state machine - ignore this"
 600                              " Access-Request silently (assuming it was a "
 601                              "duplicate)");
 602                 data->counters.packets_dropped++;
 603                 client->counters.packets_dropped++;
 604                 return -1;
 605         }
 606
 607         if (sess->eap_if->eapSuccess || sess->eap_if->eapFail)
 608                 is_complete = 1;
 609
 610         reply = radius_server_encapsulate_eap(data, client, sess, msg);
 611
 612         if (reply) {
 613                 RADIUS_DEBUG("Reply to %s:%d", from_addr, from_port);
 614                 if (wpa_debug_level <= MSG_MSGDUMP) {
 615                         radius_msg_dump(reply);
 616                 }
 617
 618                 switch (reply->hdr->code) {
 619                 case RADIUS_CODE_ACCESS_ACCEPT:
 620                         data->counters.access_accepts++;
 621                         client->counters.access_accepts++;
 622                         break;
 623                 case RADIUS_CODE_ACCESS_REJECT:
 624                         data->counters.access_rejects++;
 625                         client->counters.access_rejects++;
 626                         break;
 627                 case RADIUS_CODE_ACCESS_CHALLENGE:
 628                         data->counters.access_challenges++;
 629                         client->counters.access_challenges++;
 630                         break;
 631                 }
 632                 res = sendto(data->auth_sock, reply->buf, reply->buf_used, 0,
 633                              (struct sockaddr *) from, fromlen);
 634                 if (res < 0) {
 635                         perror("sendto[RADIUS SRV]");
 636                 }
 637                 if (sess->last_reply) {
 638                         radius_msg_free(sess->last_reply);
 639                         os_free(sess->last_reply);
 640                 }
 641                 sess->last_reply = reply;
 642                 sess->last_from_port = from_port;
 643                 sess->last_identifier = msg->hdr->identifier;
 644                 os_memcpy(sess->last_authenticator, msg->hdr->authenticator,
 645                           16);
 646         } else {
 647                 data->counters.packets_dropped++;
 648                 client->counters.packets_dropped++;
 649         }
 650
 651         if (is_complete) {
 652                 RADIUS_DEBUG("Removing completed session 0x%x after timeout",
 653                              sess->sess_id);
 654                 eloop_cancel_timeout(radius_server_session_remove_timeout,
 655                                      data, sess);
 656                 eloop_register_timeout(10, 0,
 657                                        radius_server_session_remove_timeout,
 658                                        data, sess);
 659         }
 660
 661         return 0;
 662 }
 663
 664
 665 static void radius_server_receive_auth(int sock, void *eloop_ctx,
 666                                        void *sock_ctx)
 667 {
 668         struct radius_server_data *data = eloop_ctx;
 669         u8 *buf = NULL;
 670         union {
 671                 struct sockaddr_storage ss;
 672                 struct sockaddr_in sin;
 673 #ifdef CONFIG_IPV6
 674                 struct sockaddr_in6 sin6;
 675 #endif /* CONFIG_IPV6 */
 676         } from;
 677         socklen_t fromlen;
 678         int len;
 679         struct radius_client *client = NULL;
 680         struct radius_msg *msg = NULL;
 681         char abuf[50];
 682         int from_port = 0;
 683
 684         buf = os_malloc(RADIUS_MAX_MSG_LEN);
 685         if (buf == NULL) {
 686                 goto fail;
 687         }
 688
 689         fromlen = sizeof(from);
 690         len = recvfrom(sock, buf, RADIUS_MAX_MSG_LEN, 0,
 691                        (struct sockaddr *) &from.ss, &fromlen);
 692         if (len < 0) {
 693                 perror("recvfrom[radius_server]");
 694                 goto fail;
 695         }
 696
 697 #ifdef CONFIG_IPV6
 698         if (data->ipv6) {
 699                 if (inet_ntop(AF_INET6, &from.sin6.sin6_addr, abuf,
 700                               sizeof(abuf)) == NULL)
 701                         abuf[0] = '\0';
 702                 from_port = ntohs(from.sin6.sin6_port);
 703                 RADIUS_DEBUG("Received %d bytes from %s:%d",
 704                              len, abuf, from_port);
 705
 706                 client = radius_server_get_client(data,
 707                                                   (struct in_addr *)
 708                                                   &from.sin6.sin6_addr, 1);
 709         }
 710 #endif /* CONFIG_IPV6 */
 711
 712         if (!data->ipv6) {
 713                 os_strlcpy(abuf, inet_ntoa(from.sin.sin_addr), sizeof(abuf));
 714                 from_port = ntohs(from.sin.sin_port);
 715                 RADIUS_DEBUG("Received %d bytes from %s:%d",
 716                              len, abuf, from_port);
 717
 718                 client = radius_server_get_client(data, &from.sin.sin_addr, 0);
 719         }
 720
 721         RADIUS_DUMP("Received data", buf, len);
 722
 723         if (client == NULL) {
 724                 RADIUS_DEBUG("Unknown client %s - packet ignored", abuf);
 725                 data->counters.invalid_requests++;
 726                 goto fail;
 727         }
 728
 729         msg = radius_msg_parse(buf, len);
 730         if (msg == NULL) {
 731                 RADIUS_DEBUG("Parsing incoming RADIUS frame failed");
 732                 data->counters.malformed_access_requests++;
 733                 client->counters.malformed_access_requests++;
 734                 goto fail;
 735         }
 736
 737         os_free(buf);
 738         buf = NULL;
 739
 740         if (wpa_debug_level <= MSG_MSGDUMP) {
 741                 radius_msg_dump(msg);
 742         }
 743
 744         if (msg->hdr->code != RADIUS_CODE_ACCESS_REQUEST) {
 745                 RADIUS_DEBUG("Unexpected RADIUS code %d", msg->hdr->code);
 746                 data->counters.unknown_types++;
 747                 client->counters.unknown_types++;
 748                 goto fail;
 749         }
 750
 751         data->counters.access_requests++;
 752         client->counters.access_requests++;
 753
 754         if (radius_msg_verify_msg_auth(msg, (u8 *) client->shared_secret,
 755                                        client->shared_secret_len, NULL)) {
 756                 RADIUS_DEBUG("Invalid Message-Authenticator from %s", abuf);
 757                 data->counters.bad_authenticators++;
 758                 client->counters.bad_authenticators++;
 759                 goto fail;
 760         }
 761
 762         if (radius_server_request(data, msg, (struct sockaddr *) &from,
 763                                   fromlen, client, abuf, from_port, NULL) ==
 764             -2)
 765                 return; /* msg was stored with the session */
 766
 767 fail:
 768         if (msg) {
 769                 radius_msg_free(msg);
 770                 os_free(msg);
 771         }
 772         os_free(buf);
 773 }
 774
 775
 776 static int radius_server_disable_pmtu_discovery(int s)
 777 {
 778         int r = -1;
 779 #if defined(IP_MTU_DISCOVER) && defined(IP_PMTUDISC_DONT)
 780         /* Turn off Path MTU discovery on IPv4/UDP sockets. */
 781         int action = IP_PMTUDISC_DONT;
 782         r = setsockopt(s, IPPROTO_IP, IP_MTU_DISCOVER, &action,
 783                        sizeof(action));
 784         if (r == -1)
 785                 wpa_printf(MSG_ERROR, "Failed to set IP_MTU_DISCOVER: "
 786                            "%s", strerror(errno));
 787 #endif
 788         return r;
 789 }
 790
 791
 792 static int radius_server_open_socket(int port)
 793 {
 794         int s;
 795         struct sockaddr_in addr;
 796
 797         s = socket(PF_INET, SOCK_DGRAM, 0);
 798         if (s < 0) {
 799                 perror("socket");
 800                 return -1;
 801         }
 802
 803         radius_server_disable_pmtu_discovery(s);
 804
 805         os_memset(&addr, 0, sizeof(addr));
 806         addr.sin_family = AF_INET;
 807         addr.sin_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
 817
 818 #ifdef CONFIG_IPV6
 819 static int radius_server_open_socket6(int port)
 820 {
 821         int s;
 822         struct sockaddr_in6 addr;
 823
 824         s = socket(PF_INET6, SOCK_DGRAM, 0);
 825         if (s < 0) {
 826                 perror("socket[IPv6]");
 827                 return -1;
 828         }
 829
 830         os_memset(&addr, 0, sizeof(addr));
 831         addr.sin6_family = AF_INET6;
 832         os_memcpy(&addr.sin6_addr, &in6addr_any, sizeof(in6addr_any));
 833         addr.sin6_port = htons(port);
 834         if (bind(s, (struct sockaddr *) &addr, sizeof(addr)) < 0) {
 835                 perror("bind");
 836                 close(s);
 837                 return -1;
 838         }
 839
 840         return s;
 841 }
 842 #endif /* CONFIG_IPV6 */
 843
 844
 845 static void radius_server_free_sessions(struct radius_server_data *data,
 846                                         struct radius_session *sessions)
 847 {
 848         struct radius_session *session, *prev;
 849
 850         session = sessions;
 851         while (session) {
 852                 prev = session;
 853                 session = session->next;
 854                 radius_server_session_free(data, prev);
 855         }
 856 }
 857
 858
 859 static void radius_server_free_clients(struct radius_server_data *data,
 860                                        struct radius_client *clients)
 861 {
 862         struct radius_client *client, *prev;
 863
 864         client = clients;
 865         while (client) {
 866                 prev = client;
 867                 client = client->next;
 868
 869                 radius_server_free_sessions(data, prev->sessions);
 870                 os_free(prev->shared_secret);
 871                 os_free(prev);
 872         }
 873 }
 874
 875
 876 static struct radius_client *
 877 radius_server_read_clients(const char *client_file, int ipv6)
 878 {
 879         FILE *f;
 880         const int buf_size = 1024;
 881         char *buf, *pos;
 882         struct radius_client *clients, *tail, *entry;
 883         int line = 0, mask, failed = 0, i;
 884         struct in_addr addr;
 885 #ifdef CONFIG_IPV6
 886         struct in6_addr addr6;
 887 #endif /* CONFIG_IPV6 */
 888         unsigned int val;
 889
 890         f = fopen(client_file, "r");
 891         if (f == NULL) {
 892                 RADIUS_ERROR("Could not open client file '%s'", client_file);
 893                 return NULL;
 894         }
 895
 896         buf = os_malloc(buf_size);
 897         if (buf == NULL) {
 898                 fclose(f);
 899                 return NULL;
 900         }
 901
 902         clients = tail = NULL;
 903         while (fgets(buf, buf_size, f)) {
 904                 /* Configuration file format:
 905                  * 192.168.1.0/24 secret
 906                  * 192.168.1.2 secret
 907                  * fe80::211:22ff:fe33:4455/64 secretipv6
 908                  */
 909                 line++;
 910                 buf[buf_size - 1] = '\0';
 911                 pos = buf;
 912                 while (*pos != '\0' && *pos != '\n')
 913                         pos++;
 914                 if (*pos == '\n')
 915                         *pos = '\0';
 916                 if (*buf == '\0' || *buf == '#')
 917                         continue;
 918
 919                 pos = buf;
 920                 while ((*pos >= '0' && *pos <= '9') || *pos == '.' ||
 921                        (*pos >= 'a' && *pos <= 'f') || *pos == ':' ||
 922                        (*pos >= 'A' && *pos <= 'F')) {
 923                         pos++;
 924                 }
 925
 926                 if (*pos == '\0') {
 927                         failed = 1;
 928                         break;
 929                 }
 930
 931                 if (*pos == '/') {
 932                         char *end;
 933                         *pos++ = '\0';
 934                         mask = strtol(pos, &end, 10);
 935                         if ((pos == end) ||
 936                             (mask < 0 || mask > (ipv6 ? 128 : 32))) {
 937                                 failed = 1;
 938                                 break;
 939                         }
 940                         pos = end;
 941                 } else {
 942                         mask = ipv6 ? 128 : 32;
 943                         *pos++ = '\0';
 944                 }
 945
 946                 if (!ipv6 && inet_aton(buf, &addr) == 0) {
 947                         failed = 1;
 948                         break;
 949                 }
 950 #ifdef CONFIG_IPV6
 951                 if (ipv6 && inet_pton(AF_INET6, buf, &addr6) <= 0) {
 952                         if (inet_pton(AF_INET, buf, &addr) <= 0) {
 953                                 failed = 1;
 954                                 break;
 955                         }
 956                         /* Convert IPv4 address to IPv6 */
 957                         if (mask <= 32)
 958                                 mask += (128 - 32);
 959                         os_memset(addr6.s6_addr, 0, 10);
 960                         addr6.s6_addr[10] = 0xff;
 961                         addr6.s6_addr[11] = 0xff;
 962                         os_memcpy(addr6.s6_addr + 12, (char *) &addr.s_addr,
 963                                   4);
 964                 }
 965 #endif /* CONFIG_IPV6 */
 966
 967                 while (*pos == ' ' || *pos == '\t') {
 968                         pos++;
 969                 }
 970
 971                 if (*pos == '\0') {
 972                         failed = 1;
 973                         break;
 974                 }
 975
 976                 entry = os_zalloc(sizeof(*entry));
 977                 if (entry == NULL) {
 978                         failed = 1;
 979                         break;
 980                 }
 981                 entry->shared_secret = os_strdup(pos);
 982                 if (entry->shared_secret == NULL) {
 983                         failed = 1;
 984                         os_free(entry);
 985                         break;
 986                 }
 987                 entry->shared_secret_len = os_strlen(entry->shared_secret);
 988                 entry->addr.s_addr = addr.s_addr;
 989                 if (!ipv6) {
 990                         val = 0;
 991                         for (i = 0; i < mask; i++)
 992                                 val |= 1 << (31 - i);
 993                         entry->mask.s_addr = htonl(val);
 994                 }
 995 #ifdef CONFIG_IPV6
 996                 if (ipv6) {
 997                         int offset = mask / 8;
 998
 999                         os_memcpy(entry->addr6.s6_addr, addr6.s6_addr, 16);
1000                         os_memset(entry->mask6.s6_addr, 0xff, offset);
1001                         val = 0;
1002                         for (i = 0; i < (mask % 8); i++)
1003                                 val |= 1 << (7 - i);
1004                         if (offset < 16)
1005                                 entry->mask6.s6_addr[offset] = val;
1006                 }
1007 #endif /* CONFIG_IPV6 */
1008
1009                 if (tail == NULL) {
1010                         clients = tail = entry;
1011                 } else {
1012                         tail->next = entry;
1013                         tail = entry;
1014                 }
1015         }
1016
1017         if (failed) {
1018                 RADIUS_ERROR("Invalid line %d in '%s'", line, client_file);
1019                 radius_server_free_clients(NULL, clients);
1020                 clients = NULL;
1021         }
1022
1023         os_free(buf);
1024         fclose(f);
1025
1026         return clients;
1027 }
1028
1029
1030 struct radius_server_data *
1031 radius_server_init(struct radius_server_conf *conf)
1032 {
1033         struct radius_server_data *data;
1034
1035 #ifndef CONFIG_IPV6
1036         if (conf->ipv6) {
1037                 fprintf(stderr, "RADIUS server compiled without IPv6 "
1038                         "support.\n");
1039                 return NULL;
1040         }
1041 #endif /* CONFIG_IPV6 */
1042
1043         data = os_zalloc(sizeof(*data));
1044         if (data == NULL)
1045                 return NULL;
1046
1047         os_get_time(&data->start_time);
1048         data->conf_ctx = conf->conf_ctx;
1049         data->eap_sim_db_priv = conf->eap_sim_db_priv;
1050         data->ssl_ctx = conf->ssl_ctx;
1051         data->ipv6 = conf->ipv6;
1052         if (conf->pac_opaque_encr_key) {
1053                 data->pac_opaque_encr_key = os_malloc(16);
1054                 os_memcpy(data->pac_opaque_encr_key, conf->pac_opaque_encr_key,
1055                           16);
1056         }
1057         if (conf->eap_fast_a_id) {
1058                 data->eap_fast_a_id = os_malloc(conf->eap_fast_a_id_len);
1059                 if (data->eap_fast_a_id) {
1060                         os_memcpy(data->eap_fast_a_id, conf->eap_fast_a_id,
1061                                   conf->eap_fast_a_id_len);
1062                         data->eap_fast_a_id_len = conf->eap_fast_a_id_len;
1063                 }
1064         }
1065         if (conf->eap_fast_a_id_info)
1066                 data->eap_fast_a_id_info = os_strdup(conf->eap_fast_a_id_info);
1067         data->eap_fast_prov = conf->eap_fast_prov;
1068         data->pac_key_lifetime = conf->pac_key_lifetime;
1069         data->pac_key_refresh_time = conf->pac_key_refresh_time;
1070         data->get_eap_user = conf->get_eap_user;
1071         data->eap_sim_aka_result_ind = conf->eap_sim_aka_result_ind;
1072         data->tnc = conf->tnc;
1073         data->wps = conf->wps;
1074         if (conf->eap_req_id_text) {
1075                 data->eap_req_id_text = os_malloc(conf->eap_req_id_text_len);
1076                 if (data->eap_req_id_text) {
1077                         os_memcpy(data->eap_req_id_text, conf->eap_req_id_text,
1078                                   conf->eap_req_id_text_len);
1079                         data->eap_req_id_text_len = conf->eap_req_id_text_len;
1080                 }
1081         }
1082
1083         data->clients = radius_server_read_clients(conf->client_file,
1084                                                    conf->ipv6);
1085         if (data->clients == NULL) {
1086                 printf("No RADIUS clients configured.\n");
1087                 radius_server_deinit(data);
1088                 return NULL;
1089         }
1090
1091 #ifdef CONFIG_IPV6
1092         if (conf->ipv6)
1093                 data->auth_sock = radius_server_open_socket6(conf->auth_port);
1094         else
1095 #endif /* CONFIG_IPV6 */
1096         data->auth_sock = radius_server_open_socket(conf->auth_port);
1097         if (data->auth_sock < 0) {
1098                 printf("Failed to open UDP socket for RADIUS authentication "
1099                        "server\n");
1100                 radius_server_deinit(data);
1101                 return NULL;
1102         }
1103         if (eloop_register_read_sock(data->auth_sock,
1104                                      radius_server_receive_auth,
1105                                      data, NULL)) {
1106                 radius_server_deinit(data);
1107                 return NULL;
1108         }
1109
1110         return data;
1111 }
1112
1113
1114 void radius_server_deinit(struct radius_server_data *data)
1115 {
1116         if (data == NULL)
1117                 return;
1118
1119         if (data->auth_sock >= 0) {
1120                 eloop_unregister_read_sock(data->auth_sock);
1121                 close(data->auth_sock);
1122         }
1123
1124         radius_server_free_clients(data, data->clients);
1125
1126         os_free(data->pac_opaque_encr_key);
1127         os_free(data->eap_fast_a_id);
1128         os_free(data->eap_fast_a_id_info);
1129         os_free(data->eap_req_id_text);
1130         os_free(data);
1131 }
1132
1133
1134 int radius_server_get_mib(struct radius_server_data *data, char *buf,
1135                           size_t buflen)
1136 {
1137         int ret, uptime;
1138         unsigned int idx;
1139         char *end, *pos;
1140         struct os_time now;
1141         struct radius_client *cli;
1142
1143         /* RFC 2619 - RADIUS Authentication Server MIB */
1144
1145         if (data == NULL || buflen == 0)
1146                 return 0;
1147
1148         pos = buf;
1149         end = buf + buflen;
1150
1151         os_get_time(&now);
1152         uptime = (now.sec - data->start_time.sec) * 100 +
1153                 ((now.usec - data->start_time.usec) / 10000) % 100;
1154         ret = os_snprintf(pos, end - pos,
1155                           "RADIUS-AUTH-SERVER-MIB\n"
1156                           "radiusAuthServIdent=hostapd\n"
1157                           "radiusAuthServUpTime=%d\n"
1158                           "radiusAuthServResetTime=0\n"
1159                           "radiusAuthServConfigReset=4\n",
1160                           uptime);
1161         if (ret < 0 || ret >= end - pos) {
1162                 *pos = '\0';
1163                 return pos - buf;
1164         }
1165         pos += ret;
1166
1167         ret = os_snprintf(pos, end - pos,
1168                           "radiusAuthServTotalAccessRequests=%u\n"
1169                           "radiusAuthServTotalInvalidRequests=%u\n"
1170                           "radiusAuthServTotalDupAccessRequests=%u\n"
1171                           "radiusAuthServTotalAccessAccepts=%u\n"
1172                           "radiusAuthServTotalAccessRejects=%u\n"
1173                           "radiusAuthServTotalAccessChallenges=%u\n"
1174                           "radiusAuthServTotalMalformedAccessRequests=%u\n"
1175                           "radiusAuthServTotalBadAuthenticators=%u\n"
1176                           "radiusAuthServTotalPacketsDropped=%u\n"
1177                           "radiusAuthServTotalUnknownTypes=%u\n",
1178                           data->counters.access_requests,
1179                           data->counters.invalid_requests,
1180                           data->counters.dup_access_requests,
1181                           data->counters.access_accepts,
1182                           data->counters.access_rejects,
1183                           data->counters.access_challenges,
1184                           data->counters.malformed_access_requests,
1185                           data->counters.bad_authenticators,
1186                           data->counters.packets_dropped,
1187                           data->counters.unknown_types);
1188         if (ret < 0 || ret >= end - pos) {
1189                 *pos = '\0';
1190                 return pos - buf;
1191         }
1192         pos += ret;
1193
1194         for (cli = data->clients, idx = 0; cli; cli = cli->next, idx++) {
1195                 char abuf[50], mbuf[50];
1196 #ifdef CONFIG_IPV6
1197                 if (data->ipv6) {
1198                         if (inet_ntop(AF_INET6, &cli->addr6, abuf,
1199                                       sizeof(abuf)) == NULL)
1200                                 abuf[0] = '\0';
1201                         if (inet_ntop(AF_INET6, &cli->mask6, abuf,
1202                                       sizeof(mbuf)) == NULL)
1203                                 mbuf[0] = '\0';
1204                 }
1205 #endif /* CONFIG_IPV6 */
1206                 if (!data->ipv6) {
1207                         os_strlcpy(abuf, inet_ntoa(cli->addr), sizeof(abuf));
1208                         os_strlcpy(mbuf, inet_ntoa(cli->mask), sizeof(mbuf));
1209                 }
1210
1211                 ret = os_snprintf(pos, end - pos,
1212                                   "radiusAuthClientIndex=%u\n"
1213                                   "radiusAuthClientAddress=%s/%s\n"
1214                                   "radiusAuthServAccessRequests=%u\n"
1215                                   "radiusAuthServDupAccessRequests=%u\n"
1216                                   "radiusAuthServAccessAccepts=%u\n"
1217                                   "radiusAuthServAccessRejects=%u\n"
1218                                   "radiusAuthServAccessChallenges=%u\n"
1219                                   "radiusAuthServMalformedAccessRequests=%u\n"
1220                                   "radiusAuthServBadAuthenticators=%u\n"
1221                                   "radiusAuthServPacketsDropped=%u\n"
1222                                   "radiusAuthServUnknownTypes=%u\n",
1223                                   idx,
1224                                   abuf, mbuf,
1225                                   cli->counters.access_requests,
1226                                   cli->counters.dup_access_requests,
1227                                   cli->counters.access_accepts,
1228                                   cli->counters.access_rejects,
1229                                   cli->counters.access_challenges,
1230                                   cli->counters.malformed_access_requests,
1231                                   cli->counters.bad_authenticators,
1232                                   cli->counters.packets_dropped,
1233                                   cli->counters.unknown_types);
1234                 if (ret < 0 || ret >= end - pos) {
1235                         *pos = '\0';
1236                         return pos - buf;
1237                 }
1238                 pos += ret;
1239         }
1240
1241         return pos - buf;
1242 }
1243
1244
1245 static int radius_server_get_eap_user(void *ctx, const u8 *identity,
1246                                       size_t identity_len, int phase2,
1247                                       struct eap_user *user)
1248 {
1249         struct radius_session *sess = ctx;
1250         struct radius_server_data *data = sess->server;
1251
1252         return data->get_eap_user(data->conf_ctx, identity, identity_len,
1253                                   phase2, user);
1254 }
1255
1256
1257 static const char * radius_server_get_eap_req_id_text(void *ctx, size_t *len)
1258 {
1259         struct radius_session *sess = ctx;
1260         struct radius_server_data *data = sess->server;
1261         *len = data->eap_req_id_text_len;
1262         return data->eap_req_id_text;
1263 }
1264
1265
1266 static struct eapol_callbacks radius_server_eapol_cb =
1267 {
1268         .get_eap_user = radius_server_get_eap_user,
1269         .get_eap_req_id_text = radius_server_get_eap_req_id_text,
1270 };
1271
1272
1273 void radius_server_eap_pending_cb(struct radius_server_data *data, void *ctx)
1274 {
1275         struct radius_client *cli;
1276         struct radius_session *s, *sess = NULL;
1277         struct radius_msg *msg;
1278
1279         if (data == NULL)
1280                 return;
1281
1282         for (cli = data->clients; cli; cli = cli->next) {
1283                 for (s = cli->sessions; s; s = s->next) {
1284                         if (s->eap == ctx && s->last_msg) {
1285                                 sess = s;
1286                                 break;
1287                         }
1288                         if (sess)
1289                                 break;
1290                 }
1291                 if (sess)
1292                         break;
1293         }
1294
1295         if (sess == NULL) {
1296                 RADIUS_DEBUG("No session matched callback ctx");
1297                 return;
1298         }
1299
1300         msg = sess->last_msg;
1301         sess->last_msg = NULL;
1302         eap_sm_pending_cb(sess->eap);
1303         if (radius_server_request(data, msg,
1304                                   (struct sockaddr *) &sess->last_from,
1305                                   sess->last_fromlen, cli,
1306                                   sess->last_from_addr,
1307                                   sess->last_from_port, sess) == -2)
1308                 return; /* msg was stored with the session */
1309
1310         radius_msg_free(msg);
1311         os_free(msg);
1312 }