1 /* 2 * EAP peer method: EAP-TLS (RFC 2716) 3 * Copyright (c) 2004-2008, Jouni Malinen <j (at) 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 }; 25 26 27 static void * eap_tls_init(struct eap_sm *sm) 28 { 29 struct eap_tls_data *data; 30 struct eap_peer_config *config = eap_get_config(sm); 31 if (config == NULL || 32 ((sm->init_phase2 ? config->private_key2 : config->private_key) 33 == NULL && 34 (sm->init_phase2 ? config->engine2 : config->engine) == 0)) { 35 wpa_printf(MSG_INFO, "EAP-TLS: Private key not configured"); 36 return NULL; 37 } 38 39 data = os_zalloc(sizeof(*data)); 40 if (data == NULL) 41 return NULL; 42 43 if (eap_peer_tls_ssl_init(sm, &data->ssl, config)) { 44 wpa_printf(MSG_INFO, "EAP-TLS: Failed to initialize SSL."); 45 eap_tls_deinit(sm, data); 46 if (config->engine) { 47 wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting Smartcard " 48 "PIN"); 49 eap_sm_request_pin(sm); 50 sm->ignore = TRUE; 51 } else if (config->private_key && !config->private_key_passwd) 52 { 53 wpa_printf(MSG_DEBUG, "EAP-TLS: Requesting private " 54 "key passphrase"); 55 eap_sm_request_passphrase(sm); 56 sm->ignore = TRUE; 57 } 58 return NULL; 59 } 60 61 return data; 62 } 63 64 65 static void eap_tls_deinit(struct eap_sm *sm, void *priv) 66 { 67 struct eap_tls_data *data = priv; 68 if (data == NULL) 69 return; 70 eap_peer_tls_ssl_deinit(sm, &data->ssl); 71 os_free(data->key_data); 72 os_free(data); 73 } 74 75 76 static struct wpabuf * eap_tls_failure(struct eap_sm *sm, 77 struct eap_tls_data *data, 78 struct eap_method_ret *ret, int res, 79 struct wpabuf *resp, u8 id) 80 { 81 wpa_printf(MSG_DEBUG, "EAP-TLS: TLS processing failed"); 82 83 ret->methodState = METHOD_DONE; 84 ret->decision = DECISION_FAIL; 85 86 if (res == -1) { 87 struct eap_peer_config *config = eap_get_config(sm); 88 if (config) { 89 /* 90 * The TLS handshake failed. So better forget the old 91 * PIN. It may be wrong, we cannot be sure but trying 92 * the wrong one again might block it on the card--so 93 * better ask the user again. 94 */ 95 os_free(config->pin); 96 config->pin = NULL; 97 } 98 } 99 100 if (resp) { 101 /* 102 * This is likely an alert message, so send it instead of just 103 * ACKing the error. 104 */ 105 return resp; 106 } 107 108 return eap_peer_tls_build_ack(id, EAP_TYPE_TLS, 0); 109 } 110 111 112 static void eap_tls_success(struct eap_sm *sm, struct eap_tls_data *data, 113 struct eap_method_ret *ret) 114 { 115 wpa_printf(MSG_DEBUG, "EAP-TLS: Done"); 116 117 ret->methodState = METHOD_DONE; 118 ret->decision = DECISION_UNCOND_SUCC; 119 120 os_free(data->key_data); 121 data->key_data = eap_peer_tls_derive_key(sm, &data->ssl, 122 "client EAP encryption", 123 EAP_TLS_KEY_LEN + 124 EAP_EMSK_LEN); 125 if (data->key_data) { 126 wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived key", 127 data->key_data, EAP_TLS_KEY_LEN); 128 wpa_hexdump_key(MSG_DEBUG, "EAP-TLS: Derived EMSK", 129 data->key_data + EAP_TLS_KEY_LEN, 130 EAP_EMSK_LEN); 131 } else { 132 wpa_printf(MSG_INFO, "EAP-TLS: Failed to derive key"); 133 } 134 } 135 136 137 static struct wpabuf * eap_tls_process(struct eap_sm *sm, void *priv, 138 struct eap_method_ret *ret, 139 const struct wpabuf *reqData) 140 { 141 size_t left; 142 int res; 143 struct wpabuf *resp; 144 u8 flags, id; 145 const u8 *pos; 146 struct eap_tls_data *data = priv; 147 148 pos = eap_peer_tls_process_init(sm, &data->ssl, EAP_TYPE_TLS, ret, 149 reqData, &left, &flags); 150 if (pos == NULL) 151 return NULL; 152 id = eap_get_id(reqData); 153 154 if (flags & EAP_TLS_FLAGS_START) { 155 wpa_printf(MSG_DEBUG, "EAP-TLS: Start"); 156 left = 0; /* make sure that this frame is empty, even though it 157 * should always be, anyway */ 158 } 159 160 resp = NULL; 161 res = eap_peer_tls_process_helper(sm, &data->ssl, EAP_TYPE_TLS, 0, id, 162 pos, left, &resp); 163 164 if (res < 0) { 165 return eap_tls_failure(sm, data, ret, res, resp, id); 166 } 167 168 if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) 169 eap_tls_success(sm, data, ret); 170 171 if (res == 1) { 172 wpabuf_free(resp); 173 return eap_peer_tls_build_ack(id, EAP_TYPE_TLS, 0); 174 } 175 176 return resp; 177 } 178 179 180 static Boolean eap_tls_has_reauth_data(struct eap_sm *sm, void *priv) 181 { 182 struct eap_tls_data *data = priv; 183 return tls_connection_established(sm->ssl_ctx, data->ssl.conn); 184 } 185 186 187 static void eap_tls_deinit_for_reauth(struct eap_sm *sm, void *priv) 188 { 189 } 190 191 192 static void * eap_tls_init_for_reauth(struct eap_sm *sm, void *priv) 193 { 194 struct eap_tls_data *data = priv; 195 os_free(data->key_data); 196 data->key_data = NULL; 197 if (eap_peer_tls_reauth_init(sm, &data->ssl)) { 198 os_free(data); 199 return NULL; 200 } 201 return priv; 202 } 203 204 205 static int eap_tls_get_status(struct eap_sm *sm, void *priv, char *buf, 206 size_t buflen, int verbose) 207 { 208 struct eap_tls_data *data = priv; 209 return eap_peer_tls_status(sm, &data->ssl, buf, buflen, verbose); 210 } 211 212 213 static Boolean eap_tls_isKeyAvailable(struct eap_sm *sm, void *priv) 214 { 215 struct eap_tls_data *data = priv; 216 return data->key_data != NULL; 217 } 218 219 220 static u8 * eap_tls_getKey(struct eap_sm *sm, void *priv, size_t *len) 221 { 222 struct eap_tls_data *data = priv; 223 u8 *key; 224 225 if (data->key_data == NULL) 226 return NULL; 227 228 key = os_malloc(EAP_TLS_KEY_LEN); 229 if (key == NULL) 230 return NULL; 231 232 *len = EAP_TLS_KEY_LEN; 233 os_memcpy(key, data->key_data, EAP_TLS_KEY_LEN); 234 235 return key; 236 } 237 238 239 static u8 * eap_tls_get_emsk(struct eap_sm *sm, void *priv, size_t *len) 240 { 241 struct eap_tls_data *data = priv; 242 u8 *key; 243 244 if (data->key_data == NULL) 245 return NULL; 246 247 key = os_malloc(EAP_EMSK_LEN); 248 if (key == NULL) 249 return NULL; 250 251 *len = EAP_EMSK_LEN; 252 os_memcpy(key, data->key_data + EAP_TLS_KEY_LEN, EAP_EMSK_LEN); 253 254 return key; 255 } 256 257 258 int eap_peer_tls_register(void) 259 { 260 struct eap_method *eap; 261 int ret; 262 263 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION, 264 EAP_VENDOR_IETF, EAP_TYPE_TLS, "TLS"); 265 if (eap == NULL) 266 return -1; 267 268 eap->init = eap_tls_init; 269 eap->deinit = eap_tls_deinit; 270 eap->process = eap_tls_process; 271 eap->isKeyAvailable = eap_tls_isKeyAvailable; 272 eap->getKey = eap_tls_getKey; 273 eap->get_status = eap_tls_get_status; 274 eap->has_reauth_data = eap_tls_has_reauth_data; 275 eap->deinit_for_reauth = eap_tls_deinit_for_reauth; 276 eap->init_for_reauth = eap_tls_init_for_reauth; 277 eap->get_emsk = eap_tls_get_emsk; 278 279 ret = eap_peer_method_register(eap); 280 if (ret) 281 eap_peer_method_free(eap); 282 return ret; 283 } 284
