1 /* 2 * IEEE 802.1X-2010 KaY Interface 3 * Copyright (c) 2013-2014, Qualcomm Atheros, Inc. 4 * 5 * This software may be distributed under the terms of the BSD license. 6 * See README for more details. 7 */ 8 #include <openssl/ssl.h> 9 #include "utils/includes.h" 10 11 #include "utils/common.h" 12 #include "eap_peer/eap.h" 13 #include "eap_peer/eap_i.h" 14 #include "eapol_supp/eapol_supp_sm.h" 15 #include "pae/ieee802_1x_key.h" 16 #include "pae/ieee802_1x_kay.h" 17 #include "wpa_supplicant_i.h" 18 #include "config.h" 19 #include "config_ssid.h" 20 #include "driver_i.h" 21 #include "wpas_kay.h" 22 23 24 #define DEFAULT_KEY_LEN 16 25 /* secure Connectivity Association Key Name (CKN) */ 26 #define DEFAULT_CKN_LEN 16 27 28 29 static int wpas_macsec_init(void *priv, struct macsec_init_params *params) 30 { 31 return wpa_drv_macsec_init(priv, params); 32 } 33 34 35 static int wpas_macsec_deinit(void *priv) 36 { 37 return wpa_drv_macsec_deinit(priv); 38 } 39 40 41 static int wpas_enable_protect_frames(void *wpa_s, Boolean enabled) 42 { 43 return wpa_drv_enable_protect_frames(wpa_s, enabled); 44 } 45 46 47 static int wpas_set_replay_protect(void *wpa_s, Boolean enabled, u32 window) 48 { 49 return wpa_drv_set_replay_protect(wpa_s, enabled, window); 50 } 51 52 53 static int wpas_set_current_cipher_suite(void *wpa_s, const u8 *cs, 54 size_t cs_len) 55 { 56 return wpa_drv_set_current_cipher_suite(wpa_s, cs, cs_len); 57 } 58 59 60 static int wpas_enable_controlled_port(void *wpa_s, Boolean enabled) 61 { 62 return wpa_drv_enable_controlled_port(wpa_s, enabled); 63 } 64 65 66 static int wpas_get_receive_lowest_pn(void *wpa_s, u32 channel, 67 u8 an, u32 *lowest_pn) 68 { 69 return wpa_drv_get_receive_lowest_pn(wpa_s, channel, an, lowest_pn); 70 } 71 72 73 static int wpas_get_transmit_next_pn(void *wpa_s, u32 channel, 74 u8 an, u32 *next_pn) 75 { 76 return wpa_drv_get_transmit_next_pn(wpa_s, channel, an, next_pn); 77 } 78 79 80 static int wpas_set_transmit_next_pn(void *wpa_s, u32 channel, 81 u8 an, u32 next_pn) 82 { 83 return wpa_drv_set_transmit_next_pn(wpa_s, channel, an, next_pn); 84 } 85 86 87 static int wpas_get_available_receive_sc(void *wpa_s, u32 *channel) 88 { 89 return wpa_drv_get_available_receive_sc(wpa_s, channel); 90 } 91 92 93 static unsigned int conf_offset_val(enum confidentiality_offset co) 94 { 95 switch (co) { 96 case CONFIDENTIALITY_OFFSET_30: 97 return 30; 98 break; 99 case CONFIDENTIALITY_OFFSET_50: 100 return 50; 101 default: 102 return 0; 103 } 104 } 105 106 107 static int wpas_create_receive_sc(void *wpa_s, u32 channel, 108 struct ieee802_1x_mka_sci *sci, 109 enum validate_frames vf, 110 enum confidentiality_offset co) 111 { 112 return wpa_drv_create_receive_sc(wpa_s, channel, sci->addr, sci->port, 113 conf_offset_val(co), vf); 114 } 115 116 117 static int wpas_delete_receive_sc(void *wpa_s, u32 channel) 118 { 119 return wpa_drv_delete_receive_sc(wpa_s, channel); 120 } 121 122 123 static int wpas_create_receive_sa(void *wpa_s, u32 channel, u8 an, 124 u32 lowest_pn, const u8 *sak) 125 { 126 return wpa_drv_create_receive_sa(wpa_s, channel, an, lowest_pn, sak); 127 } 128 129 130 static int wpas_enable_receive_sa(void *wpa_s, u32 channel, u8 an) 131 { 132 return wpa_drv_enable_receive_sa(wpa_s, channel, an); 133 } 134 135 136 static int wpas_disable_receive_sa(void *wpa_s, u32 channel, u8 an) 137 { 138 return wpa_drv_disable_receive_sa(wpa_s, channel, an); 139 } 140 141 142 static int wpas_get_available_transmit_sc(void *wpa_s, u32 *channel) 143 { 144 return wpa_drv_get_available_transmit_sc(wpa_s, channel); 145 } 146 147 148 static int 149 wpas_create_transmit_sc(void *wpa_s, u32 channel, 150 const struct ieee802_1x_mka_sci *sci, 151 enum confidentiality_offset co) 152 { 153 return wpa_drv_create_transmit_sc(wpa_s, channel, sci->addr, sci->port, 154 conf_offset_val(co)); 155 } 156 157 158 static int wpas_delete_transmit_sc(void *wpa_s, u32 channel) 159 { 160 return wpa_drv_delete_transmit_sc(wpa_s, channel); 161 } 162 163 164 static int wpas_create_transmit_sa(void *wpa_s, u32 channel, u8 an, 165 u32 next_pn, Boolean confidentiality, 166 const u8 *sak) 167 { 168 return wpa_drv_create_transmit_sa(wpa_s, channel, an, next_pn, 169 confidentiality, sak); 170 } 171 172 173 static int wpas_enable_transmit_sa(void *wpa_s, u32 channel, u8 an) 174 { 175 return wpa_drv_enable_transmit_sa(wpa_s, channel, an); 176 } 177 178 179 static int wpas_disable_transmit_sa(void *wpa_s, u32 channel, u8 an) 180 { 181 return wpa_drv_disable_transmit_sa(wpa_s, channel, an); 182 } 183 184 185 int ieee802_1x_alloc_kay_sm(struct wpa_supplicant *wpa_s, struct wpa_ssid *ssid) 186 { 187 struct ieee802_1x_kay_ctx *kay_ctx; 188 struct ieee802_1x_kay *res = NULL; 189 enum macsec_policy policy; 190 191 ieee802_1x_dealloc_kay_sm(wpa_s); 192 193 if (!ssid || ssid->macsec_policy == 0) 194 return 0; 195 196 policy = ssid->macsec_policy == 1 ? SHOULD_SECURE : DO_NOT_SECURE; 197 198 kay_ctx = os_zalloc(sizeof(*kay_ctx)); 199 if (!kay_ctx) 200 return -1; 201 202 kay_ctx->ctx = wpa_s; 203 204 kay_ctx->macsec_init = wpas_macsec_init; 205 kay_ctx->macsec_deinit = wpas_macsec_deinit; 206 kay_ctx->enable_protect_frames = wpas_enable_protect_frames; 207 kay_ctx->set_replay_protect = wpas_set_replay_protect; 208 kay_ctx->set_current_cipher_suite = wpas_set_current_cipher_suite; 209 kay_ctx->enable_controlled_port = wpas_enable_controlled_port; 210 kay_ctx->get_receive_lowest_pn = wpas_get_receive_lowest_pn; 211 kay_ctx->get_transmit_next_pn = wpas_get_transmit_next_pn; 212 kay_ctx->set_transmit_next_pn = wpas_set_transmit_next_pn; 213 kay_ctx->get_available_receive_sc = wpas_get_available_receive_sc; 214 kay_ctx->create_receive_sc = wpas_create_receive_sc; 215 kay_ctx->delete_receive_sc = wpas_delete_receive_sc; 216 kay_ctx->create_receive_sa = wpas_create_receive_sa; 217 kay_ctx->enable_receive_sa = wpas_enable_receive_sa; 218 kay_ctx->disable_receive_sa = wpas_disable_receive_sa; 219 kay_ctx->get_available_transmit_sc = wpas_get_available_transmit_sc; 220 kay_ctx->create_transmit_sc = wpas_create_transmit_sc; 221 kay_ctx->delete_transmit_sc = wpas_delete_transmit_sc; 222 kay_ctx->create_transmit_sa = wpas_create_transmit_sa; 223 kay_ctx->enable_transmit_sa = wpas_enable_transmit_sa; 224 kay_ctx->disable_transmit_sa = wpas_disable_transmit_sa; 225 226 res = ieee802_1x_kay_init(kay_ctx, policy, wpa_s->ifname, 227 wpa_s->own_addr); 228 if (res == NULL) { 229 os_free(kay_ctx); 230 return -1; 231 } 232 233 wpa_s->kay = res; 234 235 return 0; 236 } 237 238 239 void ieee802_1x_dealloc_kay_sm(struct wpa_supplicant *wpa_s) 240 { 241 if (!wpa_s->kay) 242 return; 243 244 ieee802_1x_kay_deinit(wpa_s->kay); 245 wpa_s->kay = NULL; 246 } 247 248 249 static int ieee802_1x_auth_get_session_id(struct wpa_supplicant *wpa_s, 250 const u8 *addr, u8 *sid, size_t *len) 251 { 252 const u8 *session_id; 253 size_t id_len, need_len; 254 255 session_id = eapol_sm_get_session_id(wpa_s->eapol, &id_len); 256 if (session_id == NULL) { 257 wpa_printf(MSG_DEBUG, 258 "Failed to get SessionID from EAPOL state machines"); 259 return -1; 260 } 261 262 need_len = 1 + 2 * SSL3_RANDOM_SIZE; 263 if (need_len > id_len) { 264 wpa_printf(MSG_DEBUG, "EAP Session-Id not long enough"); 265 return -1; 266 } 267 268 os_memcpy(sid, session_id, need_len); 269 *len = need_len; 270 271 return 0; 272 } 273 274 275 static int ieee802_1x_auth_get_msk(struct wpa_supplicant *wpa_s, const u8 *addr, 276 u8 *msk, size_t *len) 277 { 278 u8 key[EAP_MSK_LEN]; 279 size_t keylen; 280 struct eapol_sm *sm; 281 int res; 282 283 sm = wpa_s->eapol; 284 if (sm == NULL) 285 return -1; 286 287 keylen = EAP_MSK_LEN; 288 res = eapol_sm_get_key(sm, key, keylen); 289 if (res) { 290 wpa_printf(MSG_DEBUG, 291 "Failed to get MSK from EAPOL state machines"); 292 return -1; 293 } 294 295 if (keylen > *len) 296 keylen = *len; 297 os_memcpy(msk, key, keylen); 298 *len = keylen; 299 300 return 0; 301 } 302 303 304 void * ieee802_1x_notify_create_actor(struct wpa_supplicant *wpa_s, 305 const u8 *peer_addr) 306 { 307 u8 *sid; 308 size_t sid_len = 128; 309 struct mka_key_name *ckn; 310 struct mka_key *cak; 311 struct mka_key *msk; 312 void *res = NULL; 313 314 if (!wpa_s->kay || wpa_s->kay->policy == DO_NOT_SECURE) 315 return NULL; 316 317 wpa_printf(MSG_DEBUG, 318 "IEEE 802.1X: External notification - Create MKA for " 319 MACSTR, MAC2STR(peer_addr)); 320 321 msk = os_zalloc(sizeof(*msk)); 322 sid = os_zalloc(sid_len); 323 ckn = os_zalloc(sizeof(*ckn)); 324 cak = os_zalloc(sizeof(*cak)); 325 if (!msk || !sid || !ckn || !cak) 326 goto fail; 327 328 msk->len = DEFAULT_KEY_LEN; 329 if (ieee802_1x_auth_get_msk(wpa_s, wpa_s->bssid, msk->key, &msk->len)) { 330 wpa_printf(MSG_ERROR, "IEEE 802.1X: Could not get MSK"); 331 goto fail; 332 } 333 334 if (ieee802_1x_auth_get_session_id(wpa_s, wpa_s->bssid, sid, &sid_len)) 335 { 336 wpa_printf(MSG_ERROR, 337 "IEEE 802.1X: Could not get EAP Session Id"); 338 goto fail; 339 } 340 341 /* Derive CAK from MSK */ 342 cak->len = DEFAULT_KEY_LEN; 343 if (ieee802_1x_cak_128bits_aes_cmac(msk->key, wpa_s->own_addr, 344 peer_addr, cak->key)) { 345 wpa_printf(MSG_ERROR, 346 "IEEE 802.1X: Deriving CAK failed"); 347 goto fail; 348 } 349 wpa_hexdump_key(MSG_DEBUG, "Derived CAK", cak->key, cak->len); 350 351 /* Derive CKN from MSK */ 352 ckn->len = DEFAULT_CKN_LEN; 353 if (ieee802_1x_ckn_128bits_aes_cmac(msk->key, wpa_s->own_addr, 354 peer_addr, sid, sid_len, 355 ckn->name)) { 356 wpa_printf(MSG_ERROR, 357 "IEEE 802.1X: Deriving CKN failed"); 358 goto fail; 359 } 360 wpa_hexdump(MSG_DEBUG, "Derived CKN", ckn->name, ckn->len); 361 362 res = ieee802_1x_kay_create_mka(wpa_s->kay, ckn, cak, 0, 363 EAP_EXCHANGE, FALSE); 364 365 fail: 366 if (msk) { 367 os_memset(msk, 0, sizeof(*msk)); 368 os_free(msk); 369 } 370 os_free(sid); 371 os_free(ckn); 372 if (cak) { 373 os_memset(cak, 0, sizeof(*cak)); 374 os_free(cak); 375 } 376 377 return res; 378 } 379
