src/eap_peer/eap_tls.c

   1 /*
   2  * EAP peer method: EAP-TLS (RFC 2716)
   3  * Copyright (c) 2004-2008, 2012-2015, Jouni Malinen <j@w1.fi>
   4  *
   5  * This software may be distributed under the terms of the BSD license.
   6  * See README for more details.
   7  */
   8
   9 #include "includes.h"
  10
  11 #include "common.h"
  12 #include "crypto/tls.h"
  13 #include "eap_i.h"
  14 #include "eap_tls_common.h"
  15 #include "eap_config.h"
  16
  17
  18 static void eap_tls_deinit(struct eap_sm *sm, void *priv);
  19
  20
  21 struct eap_tls_data {
  22         struct eap_ssl_data ssl;
  23         u8 *key_data;
  24         u8 *session_id;
  25         size_t id_len;
  26         void *ssl_ctx;
  27         u8 eap_type;
  28         struct wpabuf *pending_resp;
  29 };
  30
  31
  32 static void * eap_tls_init(struct eap_sm *sm)
  33 {
  34         struct eap_tls_data *data;
  35         struct eap_peer_config *config = eap_get_config(sm);
  36         if (config == NULL ||
  37             ((sm->init_phase2 ? config->private_key2 : config->private_key)
  38              == NULL &&
  39              (sm->init_phase2 ? config->engine2 : config->engine) == 0)) {
  40                 wpa_printf(MSG_INFO, "EAP-TLS: Private key not configured");
  41                 return NULL;
  42         }
  43
  44         data = os_zalloc(sizeof(*data));
  45         if (data == NULL)
  46                 return NULL;
  47
  48         data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 :
  49                 sm->ssl_ctx;
  50
  51         if (eap_peer_tls_ssl_init(sm, &data->ssl, config, EAP_TYPE_TLS)) {
  52                 wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
  53                 eap_tls_deinit(sm, data);
  54                 if (config->engine) {
  55                         wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting Smartcard "
  56                                    "PIN");
  57                         eap_sm_request_pin(sm);
  58                         sm->ignore = TRUE;
  59                 } else if (config->private_key && !config->private_key_passwd)
  60                 {
  61                         wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting private "
  62                                    "key passphrase");
  63                         eap_sm_request_passphrase(sm);
  64                         sm->ignore = TRUE;
  65                 }
  66                 return NULL;
  67         }
  68
  69         data->eap_type = EAP_TYPE_TLS;
  70
  71         return data;
  72 }
  73
  74
  75 #ifdef EAP_UNAUTH_TLS
  76 static void * eap_unauth_tls_init(struct eap_sm *sm)
  77 {
  78         struct eap_tls_data *data;
  79         struct eap_peer_config *config = eap_get_config(sm);
  80
  81         data = os_zalloc(sizeof(*data));
  82         if (data == NULL)
  83                 return NULL;
  84
  85         data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 :
  86                 sm->ssl_ctx;
  87
  88         if (eap_peer_tls_ssl_init(sm, &data->ssl, config,
  89                                   EAP_UNAUTH_TLS_TYPE)) {
  90                 wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
  91                 eap_tls_deinit(sm, data);
  92                 return NULL;
  93         }
  94
  95         data->eap_type = EAP_UNAUTH_TLS_TYPE;
  96
  97         return data;
  98 }
  99 #endif /* EAP_UNAUTH_TLS */
 100
 101
 102 #ifdef CONFIG_HS20
 103 static void * eap_wfa_unauth_tls_init(struct eap_sm *sm)
 104 {
 105         struct eap_tls_data *data;
 106         struct eap_peer_config *config = eap_get_config(sm);
 107
 108         data = os_zalloc(sizeof(*data));
 109         if (data == NULL)
 110                 return NULL;
 111
 112         data->ssl_ctx = sm->init_phase2 && sm->ssl_ctx2 ? sm->ssl_ctx2 :
 113                 sm->ssl_ctx;
 114
 115         if (eap_peer_tls_ssl_init(sm, &data->ssl, config,
 116                                   EAP_WFA_UNAUTH_TLS_TYPE)) {
 117                 wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL.");
 118                 eap_tls_deinit(sm, data);
 119                 return NULL;
 120         }
 121
 122         data->eap_type = EAP_WFA_UNAUTH_TLS_TYPE;
 123
 124         return data;
 125 }
 126 #endif /* CONFIG_HS20 */
 127
 128
 129 static void eap_tls_free_key(struct eap_tls_data *data)
 130 {
 131         if (data->key_data) {
 132                 bin_clear_free(data->key_data, EAP_TLS_KEY_LEN + EAP_EMSK_LEN);
 133                 data->key_data = NULL;
 134         }
 135 }
 136
 137
 138 static void eap_tls_deinit(struct eap_sm *sm, void *priv)
 139 {
 140         struct eap_tls_data *data = priv;
 141         if (data == NULL)
 142                 return;
 143         eap_peer_tls_ssl_deinit(sm, &data->ssl);
 144         eap_tls_free_key(data);
 145         os_free(data->session_id);
 146         wpabuf_free(data->pending_resp);
 147         os_free(data);
 148 }
 149
 150
 151 static struct wpabuf * eap_tls_failure(struct eap_sm *sm,
 152                                        struct eap_tls_data *data,
 153                                        struct eap_method_ret *ret, int res,
 154                                        struct wpabuf *resp, u8 id)
 155 {
 156         wpa_printf(MSG_DEBUG, "EAP-TLS: TLS processing failed");
 157
 158         ret->methodState = METHOD_DONE;
 159         ret->decision = DECISION_FAIL;
 160
 161         if (resp) {
 162                 /*
 163                  * This is likely an alert message, so send it instead of just
 164                  * ACKing the error.
 165                  */
 166                 return resp;
 167         }
 168
 169         return eap_peer_tls_build_ack(id, data->eap_type, 0);
 170 }
 171
 172
 173 static void eap_tls_success(struct eap_sm *sm, struct eap_tls_data *data,
 174                             struct eap_method_ret *ret)
 175 {
 176         wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
 177
 178         ret->methodState = METHOD_DONE;
 179         ret->decision = DECISION_UNCOND_SUCC;
 180
 181         eap_tls_free_key(data);
 182         data->key_data = eap_peer_tls_derive_key(sm, &data->ssl,
 183                                                  "client EAP encryption",
 184                                                  EAP_TLS_KEY_LEN +
 185                                                  EAP_EMSK_LEN);
 186         if (data->key_data) {
 187                 wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived key",
 188                                 data->key_data, EAP_TLS_KEY_LEN);
 189                 wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived EMSK",
 190                                 data->key_data + EAP_TLS_KEY_LEN,
 191                                 EAP_EMSK_LEN);
 192         } else {
 193                 wpa_printf(MSG_INFO, "EAP-TLS: Failed to derive key");
 194         }
 195
 196         os_free(data->session_id);
 197         data->session_id = eap_peer_tls_derive_session_id(sm, &data->ssl,
 198                                                           EAP_TYPE_TLS,
 199                                                           &data->id_len);
 200         if (data->session_id) {
 201                 wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived Session-Id",
 202                             data->session_id, data->id_len);
 203         } else {
 204                 wpa_printf(MSG_ERROR, "EAP-TLS: Failed to derive Session-Id");
 205         }
 206 }
 207
 208
 209 static struct wpabuf * eap_tls_process(struct eap_sm *sm, void *priv,
 210                                        struct eap_method_ret *ret,
 211                                        const struct wpabuf *reqData)
 212 {
 213         size_t left;
 214         int res;
 215         struct wpabuf *resp;
 216         u8 flags, id;
 217         const u8 *pos;
 218         struct eap_tls_data *data = priv;
 219         struct wpabuf msg;
 220
 221         if (sm->waiting_ext_cert_check && data->pending_resp) {
 222                 struct eap_peer_config *config = eap_get_config(sm);
 223
 224                 if (config->pending_ext_cert_check == EXT_CERT_CHECK_GOOD) {
 225                         wpa_printf(MSG_DEBUG,
 226                                    "EAP-TLS: External certificate check succeeded - continue handshake");
 227                         resp = data->pending_resp;
 228                         data->pending_resp = NULL;
 229                         sm->waiting_ext_cert_check = 0;
 230                         return resp;
 231                 }
 232
 233                 if (config->pending_ext_cert_check == EXT_CERT_CHECK_BAD) {
 234                         wpa_printf(MSG_DEBUG,
 235                                    "EAP-TLS: External certificate check failed - force authentication failure");
 236                         ret->methodState = METHOD_DONE;
 237                         ret->decision = DECISION_FAIL;
 238                         sm->waiting_ext_cert_check = 0;
 239                         return NULL;
 240                 }
 241
 242                 wpa_printf(MSG_DEBUG,
 243                            "EAP-TLS: Continuing to wait external server certificate validation");
 244                 return NULL;
 245         }
 246
 247         pos = eap_peer_tls_process_init(sm, &data->ssl, data->eap_type, ret,
 248                                         reqData, &left, &flags);
 249         if (pos == NULL)
 250                 return NULL;
 251         id = eap_get_id(reqData);
 252
 253         if (flags & EAP_TLS_FLAGS_START) {
 254                 wpa_printf(MSG_DEBUG, "EAP-TLS: Start");
 255                 left = 0; /* make sure that this frame is empty, even though it
 256                            * should always be, anyway */
 257         }
 258
 259         resp = NULL;
 260         wpabuf_set(&msg, pos, left);
 261         res = eap_peer_tls_process_helper(sm, &data->ssl, data->eap_type, 0,
 262                                           id, &msg, &resp);
 263
 264         if (res < 0) {
 265                 return eap_tls_failure(sm, data, ret, res, resp, id);
 266         }
 267
 268         if (sm->waiting_ext_cert_check) {
 269                 wpa_printf(MSG_DEBUG,
 270                            "EAP-TLS: Waiting external server certificate validation");
 271                 wpabuf_free(data->pending_resp);
 272                 data->pending_resp = resp;
 273                 return NULL;
 274         }
 275
 276         if (tls_connection_established(data->ssl_ctx, data->ssl.conn))
 277                 eap_tls_success(sm, data, ret);
 278
 279         if (res == 1) {
 280                 wpabuf_free(resp);
 281                 return eap_peer_tls_build_ack(id, data->eap_type, 0);
 282         }
 283
 284         return resp;
 285 }
 286
 287
 288 static Boolean eap_tls_has_reauth_data(struct eap_sm *sm, void *priv)
 289 {
 290         struct eap_tls_data *data = priv;
 291         return tls_connection_established(data->ssl_ctx, data->ssl.conn);
 292 }
 293
 294
 295 static void eap_tls_deinit_for_reauth(struct eap_sm *sm, void *priv)
 296 {
 297         struct eap_tls_data *data = priv;
 298
 299         wpabuf_free(data->pending_resp);
 300         data->pending_resp = NULL;
 301 }
 302
 303
 304 static void * eap_tls_init_for_reauth(struct eap_sm *sm, void *priv)
 305 {
 306         struct eap_tls_data *data = priv;
 307         eap_tls_free_key(data);
 308         os_free(data->session_id);
 309         data->session_id = NULL;
 310         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
 311                 os_free(data);
 312                 return NULL;
 313         }
 314         return priv;
 315 }
 316
 317
 318 static int eap_tls_get_status(struct eap_sm *sm, void *priv, char *buf,
 319                               size_t buflen, int verbose)
 320 {
 321         struct eap_tls_data *data = priv;
 322         return eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
 323 }
 324
 325
 326 static Boolean eap_tls_isKeyAvailable(struct eap_sm *sm, void *priv)
 327 {
 328         struct eap_tls_data *data = priv;
 329         return data->key_data != NULL;
 330 }
 331
 332
 333 static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
 334 {
 335         struct eap_tls_data *data = priv;
 336         u8 *key;
 337
 338         if (data->key_data == NULL)
 339                 return NULL;
 340
 341         key = os_malloc(EAP_TLS_KEY_LEN);
 342         if (key == NULL)
 343                 return NULL;
 344
 345         *len = EAP_TLS_KEY_LEN;
 346         os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN);
 347
 348         return key;
 349 }
 350
 351
 352 static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
 353 {
 354         struct eap_tls_data *data = priv;
 355         u8 *key;
 356
 357         if (data->key_data == NULL)
 358                 return NULL;
 359
 360         key = os_malloc(EAP_EMSK_LEN);
 361         if (key == NULL)
 362                 return NULL;
 363
 364         *len = EAP_EMSK_LEN;
 365         os_memcpy(key, data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN);
 366
 367         return key;
 368 }
 369
 370
 371 static u8 * eap_tls_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
 372 {
 373         struct eap_tls_data *data = priv;
 374         u8 *id;
 375
 376         if (data->session_id == NULL)
 377                 return NULL;
 378
 379         id = os_malloc(data->id_len);
 380         if (id == NULL)
 381                 return NULL;
 382
 383         *len = data->id_len;
 384         os_memcpy(id, data->session_id, data->id_len);
 385
 386         return id;
 387 }
 388
 389
 390 int eap_peer_tls_register(void)
 391 {
 392         struct eap_method *eap;
 393
 394         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
 395                                     EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
 396         if (eap == NULL)
 397                 return -1;
 398
 399         eap->init = eap_tls_init;
 400         eap->deinit = eap_tls_deinit;
 401         eap->process = eap_tls_process;
 402         eap->isKeyAvailable = eap_tls_isKeyAvailable;
 403         eap->getKey = eap_tls_getKey;
 404         eap->getSessionId = eap_tls_get_session_id;
 405         eap->get_status = eap_tls_get_status;
 406         eap->has_reauth_data = eap_tls_has_reauth_data;
 407         eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
 408         eap->init_for_reauth = eap_tls_init_for_reauth;
 409         eap->get_emsk = eap_tls_get_emsk;
 410
 411         return eap_peer_method_register(eap);
 412 }
 413
 414
 415 #ifdef EAP_UNAUTH_TLS
 416 int eap_peer_unauth_tls_register(void)
 417 {
 418         struct eap_method *eap;
 419
 420         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
 421                                     EAP_VENDOR_UNAUTH_TLS,
 422                                     EAP_VENDOR_TYPE_UNAUTH_TLS, "UNAUTH-TLS");
 423         if (eap == NULL)
 424                 return -1;
 425
 426         eap->init = eap_unauth_tls_init;
 427         eap->deinit = eap_tls_deinit;
 428         eap->process = eap_tls_process;
 429         eap->isKeyAvailable = eap_tls_isKeyAvailable;
 430         eap->getKey = eap_tls_getKey;
 431         eap->get_status = eap_tls_get_status;
 432         eap->has_reauth_data = eap_tls_has_reauth_data;
 433         eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
 434         eap->init_for_reauth = eap_tls_init_for_reauth;
 435         eap->get_emsk = eap_tls_get_emsk;
 436
 437         return eap_peer_method_register(eap);
 438 }
 439 #endif /* EAP_UNAUTH_TLS */
 440
 441
 442 #ifdef CONFIG_HS20
 443 int eap_peer_wfa_unauth_tls_register(void)
 444 {
 445         struct eap_method *eap;
 446
 447         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
 448                                     EAP_VENDOR_WFA_NEW,
 449                                     EAP_VENDOR_WFA_UNAUTH_TLS,
 450                                     "WFA-UNAUTH-TLS");
 451         if (eap == NULL)
 452                 return -1;
 453
 454         eap->init = eap_wfa_unauth_tls_init;
 455         eap->deinit = eap_tls_deinit;
 456         eap->process = eap_tls_process;
 457         eap->isKeyAvailable = eap_tls_isKeyAvailable;
 458         eap->getKey = eap_tls_getKey;
 459         eap->get_status = eap_tls_get_status;
 460         eap->has_reauth_data = eap_tls_has_reauth_data;
 461         eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
 462         eap->init_for_reauth = eap_tls_init_for_reauth;
 463         eap->get_emsk = eap_tls_get_emsk;
 464
 465         return eap_peer_method_register(eap);
 466 }
 467 #endif /* CONFIG_HS20 */