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         const char *label;
 177
 178         wpa_printf(MSG_DEBUG, "EAP-TLS: Done");
 179
 180         if (data->ssl.tls_out) {
 181                 wpa_printf(MSG_DEBUG, "EAP-TLS: Fragment(s) remaining");
 182                 return;
 183         }
 184
 185         if (data->ssl.tls_v13) {
 186                 label = "client EAP encryption KM";
 187
 188                 /* A possible NewSessionTicket may be received before
 189                  * EAP-Success, so need to allow it to be received. */
 190                 ret->methodState = METHOD_MAY_CONT;
 191                 ret->decision = DECISION_COND_SUCC;
 192         } else {
 193                 label = "client EAP encryption";
 194
 195                 ret->methodState = METHOD_DONE;
 196                 ret->decision = DECISION_UNCOND_SUCC;
 197         }
 198
 199         eap_tls_free_key(data);
 200         data->key_data = eap_peer_tls_derive_key(sm, &data->ssl, label,
 201                                                  EAP_TLS_KEY_LEN +
 202                                                  EAP_EMSK_LEN);
 203         if (data->key_data) {
 204                 wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived key",
 205                                 data->key_data, EAP_TLS_KEY_LEN);
 206                 wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived EMSK",
 207                                 data->key_data + EAP_TLS_KEY_LEN,
 208                                 EAP_EMSK_LEN);
 209         } else {
 210                 wpa_printf(MSG_INFO, "EAP-TLS: Failed to derive key");
 211         }
 212
 213         os_free(data->session_id);
 214         data->session_id = eap_peer_tls_derive_session_id(sm, &data->ssl,
 215                                                           EAP_TYPE_TLS,
 216                                                           &data->id_len);
 217         if (data->session_id) {
 218                 wpa_hexdump(MSG_DEBUG, "EAP-TLS: Derived Session-Id",
 219                             data->session_id, data->id_len);
 220         } else {
 221                 wpa_printf(MSG_ERROR, "EAP-TLS: Failed to derive Session-Id");
 222         }
 223 }
 224
 225
 226 static struct wpabuf * eap_tls_process(struct eap_sm *sm, void *priv,
 227                                        struct eap_method_ret *ret,
 228                                        const struct wpabuf *reqData)
 229 {
 230         size_t left;
 231         int res;
 232         struct wpabuf *resp;
 233         u8 flags, id;
 234         const u8 *pos;
 235         struct eap_tls_data *data = priv;
 236         struct wpabuf msg;
 237
 238         if (sm->waiting_ext_cert_check && data->pending_resp) {
 239                 struct eap_peer_config *config = eap_get_config(sm);
 240
 241                 if (config->pending_ext_cert_check == EXT_CERT_CHECK_GOOD) {
 242                         wpa_printf(MSG_DEBUG,
 243                                    "EAP-TLS: External certificate check succeeded - continue handshake");
 244                         resp = data->pending_resp;
 245                         data->pending_resp = NULL;
 246                         sm->waiting_ext_cert_check = 0;
 247                         return resp;
 248                 }
 249
 250                 if (config->pending_ext_cert_check == EXT_CERT_CHECK_BAD) {
 251                         wpa_printf(MSG_DEBUG,
 252                                    "EAP-TLS: External certificate check failed - force authentication failure");
 253                         ret->methodState = METHOD_DONE;
 254                         ret->decision = DECISION_FAIL;
 255                         sm->waiting_ext_cert_check = 0;
 256                         return NULL;
 257                 }
 258
 259                 wpa_printf(MSG_DEBUG,
 260                            "EAP-TLS: Continuing to wait external server certificate validation");
 261                 return NULL;
 262         }
 263
 264         pos = eap_peer_tls_process_init(sm, &data->ssl, data->eap_type, ret,
 265                                         reqData, &left, &flags);
 266         if (pos == NULL)
 267                 return NULL;
 268         id = eap_get_id(reqData);
 269
 270         if (flags & EAP_TLS_FLAGS_START) {
 271                 wpa_printf(MSG_DEBUG, "EAP-TLS: Start");
 272                 left = 0; /* make sure that this frame is empty, even though it
 273                            * should always be, anyway */
 274         }
 275
 276         resp = NULL;
 277         wpabuf_set(&msg, pos, left);
 278         res = eap_peer_tls_process_helper(sm, &data->ssl, data->eap_type, 0,
 279                                           id, &msg, &resp);
 280
 281         if (res < 0) {
 282                 return eap_tls_failure(sm, data, ret, res, resp, id);
 283         }
 284
 285         if (sm->waiting_ext_cert_check) {
 286                 wpa_printf(MSG_DEBUG,
 287                            "EAP-TLS: Waiting external server certificate validation");
 288                 wpabuf_free(data->pending_resp);
 289                 data->pending_resp = resp;
 290                 return NULL;
 291         }
 292
 293         if (tls_connection_established(data->ssl_ctx, data->ssl.conn))
 294                 eap_tls_success(sm, data, ret);
 295
 296         if (res == 1) {
 297                 wpabuf_free(resp);
 298                 return eap_peer_tls_build_ack(id, data->eap_type, 0);
 299         }
 300
 301         return resp;
 302 }
 303
 304
 305 static Boolean eap_tls_has_reauth_data(struct eap_sm *sm, void *priv)
 306 {
 307         struct eap_tls_data *data = priv;
 308         return tls_connection_established(data->ssl_ctx, data->ssl.conn);
 309 }
 310
 311
 312 static void eap_tls_deinit_for_reauth(struct eap_sm *sm, void *priv)
 313 {
 314         struct eap_tls_data *data = priv;
 315
 316         wpabuf_free(data->pending_resp);
 317         data->pending_resp = NULL;
 318 }
 319
 320
 321 static void * eap_tls_init_for_reauth(struct eap_sm *sm, void *priv)
 322 {
 323         struct eap_tls_data *data = priv;
 324         eap_tls_free_key(data);
 325         os_free(data->session_id);
 326         data->session_id = NULL;
 327         if (eap_peer_tls_reauth_init(sm, &data->ssl)) {
 328                 os_free(data);
 329                 return NULL;
 330         }
 331         return priv;
 332 }
 333
 334
 335 static int eap_tls_get_status(struct eap_sm *sm, void *priv, char *buf,
 336                               size_t buflen, int verbose)
 337 {
 338         struct eap_tls_data *data = priv;
 339         return eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose);
 340 }
 341
 342
 343 static Boolean eap_tls_isKeyAvailable(struct eap_sm *sm, void *priv)
 344 {
 345         struct eap_tls_data *data = priv;
 346         return data->key_data != NULL;
 347 }
 348
 349
 350 static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len)
 351 {
 352         struct eap_tls_data *data = priv;
 353         u8 *key;
 354
 355         if (data->key_data == NULL)
 356                 return NULL;
 357
 358         key = os_memdup(data->key_data, EAP_TLS_KEY_LEN);
 359         if (key == NULL)
 360                 return NULL;
 361
 362         *len = EAP_TLS_KEY_LEN;
 363
 364         return key;
 365 }
 366
 367
 368 static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
 369 {
 370         struct eap_tls_data *data = priv;
 371         u8 *key;
 372
 373         if (data->key_data == NULL)
 374                 return NULL;
 375
 376         key = os_memdup(data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN);
 377         if (key == NULL)
 378                 return NULL;
 379
 380         *len = EAP_EMSK_LEN;
 381
 382         return key;
 383 }
 384
 385
 386 static u8 * eap_tls_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
 387 {
 388         struct eap_tls_data *data = priv;
 389         u8 *id;
 390
 391         if (data->session_id == NULL)
 392                 return NULL;
 393
 394         id = os_memdup(data->session_id, data->id_len);
 395         if (id == NULL)
 396                 return NULL;
 397
 398         *len = data->id_len;
 399
 400         return id;
 401 }
 402
 403
 404 int eap_peer_tls_register(void)
 405 {
 406         struct eap_method *eap;
 407
 408         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
 409                                     EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS");
 410         if (eap == NULL)
 411                 return -1;
 412
 413         eap->init = eap_tls_init;
 414         eap->deinit = eap_tls_deinit;
 415         eap->process = eap_tls_process;
 416         eap->isKeyAvailable = eap_tls_isKeyAvailable;
 417         eap->getKey = eap_tls_getKey;
 418         eap->getSessionId = eap_tls_get_session_id;
 419         eap->get_status = eap_tls_get_status;
 420         eap->has_reauth_data = eap_tls_has_reauth_data;
 421         eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
 422         eap->init_for_reauth = eap_tls_init_for_reauth;
 423         eap->get_emsk = eap_tls_get_emsk;
 424
 425         return eap_peer_method_register(eap);
 426 }
 427
 428
 429 #ifdef EAP_UNAUTH_TLS
 430 int eap_peer_unauth_tls_register(void)
 431 {
 432         struct eap_method *eap;
 433
 434         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
 435                                     EAP_VENDOR_UNAUTH_TLS,
 436                                     EAP_VENDOR_TYPE_UNAUTH_TLS, "UNAUTH-TLS");
 437         if (eap == NULL)
 438                 return -1;
 439
 440         eap->init = eap_unauth_tls_init;
 441         eap->deinit = eap_tls_deinit;
 442         eap->process = eap_tls_process;
 443         eap->isKeyAvailable = eap_tls_isKeyAvailable;
 444         eap->getKey = eap_tls_getKey;
 445         eap->get_status = eap_tls_get_status;
 446         eap->has_reauth_data = eap_tls_has_reauth_data;
 447         eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
 448         eap->init_for_reauth = eap_tls_init_for_reauth;
 449         eap->get_emsk = eap_tls_get_emsk;
 450
 451         return eap_peer_method_register(eap);
 452 }
 453 #endif /* EAP_UNAUTH_TLS */
 454
 455
 456 #ifdef CONFIG_HS20
 457 int eap_peer_wfa_unauth_tls_register(void)
 458 {
 459         struct eap_method *eap;
 460
 461         eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
 462                                     EAP_VENDOR_WFA_NEW,
 463                                     EAP_VENDOR_WFA_UNAUTH_TLS,
 464                                     "WFA-UNAUTH-TLS");
 465         if (eap == NULL)
 466                 return -1;
 467
 468         eap->init = eap_wfa_unauth_tls_init;
 469         eap->deinit = eap_tls_deinit;
 470         eap->process = eap_tls_process;
 471         eap->isKeyAvailable = eap_tls_isKeyAvailable;
 472         eap->getKey = eap_tls_getKey;
 473         eap->get_status = eap_tls_get_status;
 474         eap->has_reauth_data = eap_tls_has_reauth_data;
 475         eap->deinit_for_reauth = eap_tls_deinit_for_reauth;
 476         eap->init_for_reauth = eap_tls_init_for_reauth;
 477         eap->get_emsk = eap_tls_get_emsk;
 478
 479         return eap_peer_method_register(eap);
 480 }
 481 #endif /* CONFIG_HS20 */