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