static struct wpabuf * eap_eke_build_identity(struct eap_sm *sm, struct eap_eke_data *data, u8 id) { struct wpabuf *msg; size_t plen; wpa_printf(MSG_DEBUG, "EAP-EKE: Request/Identity"); plen = 2 + 4 * 4 + 1 + sm->server_id_len; msg = eap_eke_build_msg(data, id, plen, EAP_EKE_ID); if (msg == NULL) return NULL; wpabuf_put_u8(msg, 4); /* NumProposals */ wpabuf_put_u8(msg, 0); /* Reserved */ /* Proposal - DH Group 16 with AES128-CBC and SHA256 */ wpabuf_put_u8(msg, EAP_EKE_DHGROUP_EKE_16); /* Group Description */ wpabuf_put_u8(msg, EAP_EKE_ENCR_AES128_CBC); /* Encryption */ wpabuf_put_u8(msg, EAP_EKE_PRF_HMAC_SHA2_256); /* PRF */ wpabuf_put_u8(msg, EAP_EKE_MAC_HMAC_SHA2_256); /* MAC */ /* Proposal - DH Group 15 with AES128-CBC and SHA256 */ wpabuf_put_u8(msg, EAP_EKE_DHGROUP_EKE_15); /* Group Description */ wpabuf_put_u8(msg, EAP_EKE_ENCR_AES128_CBC); /* Encryption */ wpabuf_put_u8(msg, EAP_EKE_PRF_HMAC_SHA2_256); /* PRF */ wpabuf_put_u8(msg, EAP_EKE_MAC_HMAC_SHA2_256); /* MAC */ /* Proposal - DH Group 14 with AES128-CBC and SHA256 */ wpabuf_put_u8(msg, EAP_EKE_DHGROUP_EKE_14); /* Group Description */ wpabuf_put_u8(msg, EAP_EKE_ENCR_AES128_CBC); /* Encryption */ wpabuf_put_u8(msg, EAP_EKE_PRF_HMAC_SHA2_256); /* PRF */ wpabuf_put_u8(msg, EAP_EKE_MAC_HMAC_SHA2_256); /* MAC */ /* * Proposal - DH Group 14 with AES128-CBC and SHA1 * (mandatory to implement algorithms) */ wpabuf_put_u8(msg, EAP_EKE_DHGROUP_EKE_14); /* Group Description */ wpabuf_put_u8(msg, EAP_EKE_ENCR_AES128_CBC); /* Encryption */ wpabuf_put_u8(msg, EAP_EKE_PRF_HMAC_SHA1); /* PRF */ wpabuf_put_u8(msg, EAP_EKE_MAC_HMAC_SHA1); /* MAC */ /* Server IDType + Identity */ wpabuf_put_u8(msg, data->serverid_type); wpabuf_put_data(msg, sm->server_id, sm->server_id_len); wpabuf_free(data->msgs); data->msgs = wpabuf_dup(msg); if (data->msgs == NULL) { wpabuf_free(msg); return NULL; } return msg; }
static struct wpabuf * eap_eke_build_confirm(struct eap_sm *sm, struct eap_eke_data *data, u8 id) { struct wpabuf *msg; size_t plen, prot_len; u8 nonces[2 * EAP_EKE_MAX_NONCE_LEN]; u8 *auth; wpa_printf(MSG_DEBUG, "EAP-EKE: Request/Confirm"); plen = data->sess.pnonce_ps_len + data->sess.prf_len; msg = eap_eke_build_msg(data, id, plen, EAP_EKE_CONFIRM); if (msg == NULL) { eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); return eap_eke_build_failure(data, id); } if (random_get_bytes(data->nonce_s, data->sess.nonce_len)) { wpabuf_free(msg); eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); return eap_eke_build_failure(data, id); } wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_S", data->nonce_s, data->sess.nonce_len); os_memcpy(nonces, data->nonce_p, data->sess.nonce_len); os_memcpy(nonces + data->sess.nonce_len, data->nonce_s, data->sess.nonce_len); prot_len = wpabuf_tailroom(msg); if (eap_eke_prot(&data->sess, nonces, 2 * data->sess.nonce_len, wpabuf_put(msg, 0), &prot_len) < 0) { wpabuf_free(msg); eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); return eap_eke_build_failure(data, id); } wpabuf_put(msg, prot_len); if (eap_eke_derive_ka(&data->sess, sm->server_id, sm->server_id_len, data->peerid, data->peerid_len, data->nonce_p, data->nonce_s) < 0) { wpabuf_free(msg); eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); return eap_eke_build_failure(data, id); } auth = wpabuf_put(msg, data->sess.prf_len); if (eap_eke_auth(&data->sess, "EAP-EKE server", data->msgs, auth) < 0) { wpabuf_free(msg); eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); return eap_eke_build_failure(data, id); } wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_S", auth, data->sess.prf_len); return msg; }
static struct wpabuf * eap_eke_build_failure(struct eap_eke_data *data, u8 id) { struct wpabuf *msg; wpa_printf(MSG_DEBUG, "EAP-EKE: Request/Failure: Failure-Code=0x%x", data->failure_code); msg = eap_eke_build_msg(data, id, 4, EAP_EKE_FAILURE); if (msg == NULL) { eap_eke_state(data, FAILURE); return NULL; } wpabuf_put_be32(msg, data->failure_code); return msg; }
static struct wpabuf * eap_eke_build_fail(struct eap_eke_data *data, struct eap_method_ret *ret, u8 id, u32 failure_code) { struct wpabuf *resp; wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Failure/Response - code=0x%x", failure_code); resp = eap_eke_build_msg(data, id, 4, EAP_EKE_FAILURE); if (resp) wpabuf_put_be32(resp, failure_code); os_memset(data->dh_priv, 0, sizeof(data->dh_priv)); eap_eke_session_clean(&data->sess); eap_eke_state(data, FAILURE); ret->methodState = METHOD_DONE; ret->decision = DECISION_FAIL; ret->allowNotifications = FALSE; return resp; }
static struct wpabuf * eap_eke_build_commit(struct eap_sm *sm, struct eap_eke_data *data, u8 id) { struct wpabuf *msg; u8 pub[EAP_EKE_MAX_DH_LEN]; wpa_printf(MSG_DEBUG, "EAP-EKE: Request/Commit"); if (sm->user == NULL || sm->user->password == NULL) { wpa_printf(MSG_INFO, "EAP-EKE: Password with not configured"); eap_eke_fail(data, EAP_EKE_FAIL_PASSWD_NOT_FOUND); return eap_eke_build_failure(data, id); } if (eap_eke_derive_key(&data->sess, sm->user->password, sm->user->password_len, sm->server_id, sm->server_id_len, data->peerid, data->peerid_len, data->key) < 0) { wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive key"); eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); return eap_eke_build_failure(data, id); } msg = eap_eke_build_msg(data, id, data->sess.dhcomp_len, EAP_EKE_COMMIT); if (msg == NULL) { eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); return eap_eke_build_failure(data, id); } /* * y_s = g ^ x_s (mod p) * x_s = random number 2 .. p-1 * temp = prf(0+, password) * key = prf+(temp, ID_S | ID_P) * DHComponent_S = Encr(key, y_s) */ if (eap_eke_dh_init(data->sess.dhgroup, data->dh_priv, pub) < 0) { wpa_printf(MSG_INFO, "EAP-EKE: Failed to initialize DH"); eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); return eap_eke_build_failure(data, id); } if (eap_eke_dhcomp(&data->sess, data->key, pub, wpabuf_put(msg, data->sess.dhcomp_len)) < 0) { wpa_printf(MSG_INFO, "EAP-EKE: Failed to build DHComponent_S"); wpabuf_free(msg); eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); return eap_eke_build_failure(data, id); } if (wpabuf_resize(&data->msgs, wpabuf_len(msg)) < 0) { wpabuf_free(msg); eap_eke_fail(data, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); return eap_eke_build_failure(data, id); } wpabuf_put_buf(data->msgs, msg); return msg; }
static struct wpabuf * eap_eke_process_confirm(struct eap_eke_data *data, struct eap_method_ret *ret, const struct wpabuf *reqData, const u8 *payload, size_t payload_len) { struct wpabuf *resp; const u8 *pos, *end; size_t prot_len; u8 nonces[2 * EAP_EKE_MAX_NONCE_LEN]; u8 auth_s[EAP_EKE_MAX_HASH_LEN]; size_t decrypt_len; u8 *auth; u8 id = eap_get_id(reqData); if (data->state != CONFIRM) { wpa_printf(MSG_DEBUG, "EAP-EKE: EAP-EKE-Confirm/Request received in unexpected state (%d)", data->state); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PROTO_ERROR); } wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Confirm/Request"); pos = payload; end = payload + payload_len; if (pos + data->sess.pnonce_ps_len + data->sess.prf_len > end) { wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Confirm"); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PROTO_ERROR); } decrypt_len = sizeof(nonces); if (eap_eke_decrypt_prot(&data->sess, pos, data->sess.pnonce_ps_len, nonces, &decrypt_len) < 0) { wpa_printf(MSG_INFO, "EAP-EKE: Failed to decrypt PNonce_PS"); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_AUTHENTICATION_FAIL); } if (decrypt_len != (size_t) 2 * data->sess.nonce_len) { wpa_printf(MSG_INFO, "EAP-EKE: PNonce_PS protected data length does not match length of Nonce_P and Nonce_S"); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_AUTHENTICATION_FAIL); } wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Received Nonce_P | Nonce_S", nonces, 2 * data->sess.nonce_len); if (os_memcmp(data->nonce_p, nonces, data->sess.nonce_len) != 0) { wpa_printf(MSG_INFO, "EAP-EKE: Received Nonce_P does not match transmitted Nonce_P"); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_AUTHENTICATION_FAIL); } os_memcpy(data->nonce_s, nonces + data->sess.nonce_len, data->sess.nonce_len); wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_S", data->nonce_s, data->sess.nonce_len); if (eap_eke_derive_ka(&data->sess, data->serverid, data->serverid_len, data->peerid, data->peerid_len, data->nonce_p, data->nonce_s) < 0) { return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } if (eap_eke_auth(&data->sess, "EAP-EKE server", data->msgs, auth_s) < 0) { return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_S", auth_s, data->sess.prf_len); if (os_memcmp_const(auth_s, pos + data->sess.pnonce_ps_len, data->sess.prf_len) != 0) { wpa_printf(MSG_INFO, "EAP-EKE: Auth_S does not match"); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_AUTHENTICATION_FAIL); } wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Confirm/Response"); resp = eap_eke_build_msg(data, id, data->sess.pnonce_len + data->sess.prf_len, EAP_EKE_CONFIRM); if (resp == NULL) { return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } prot_len = wpabuf_tailroom(resp); if (eap_eke_prot(&data->sess, data->nonce_s, data->sess.nonce_len, wpabuf_put(resp, 0), &prot_len) < 0) { wpabuf_free(resp); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } wpabuf_put(resp, prot_len); auth = wpabuf_put(resp, data->sess.prf_len); if (eap_eke_auth(&data->sess, "EAP-EKE peer", data->msgs, auth) < 0) { wpabuf_free(resp); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_P", auth, data->sess.prf_len); if (eap_eke_derive_msk(&data->sess, data->serverid, data->serverid_len, data->peerid, data->peerid_len, data->nonce_s, data->nonce_p, data->msk, data->emsk) < 0) { wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive MSK/EMSK"); wpabuf_free(resp); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } os_memset(data->dh_priv, 0, sizeof(data->dh_priv)); eap_eke_session_clean(&data->sess); eap_eke_state(data, SUCCESS); ret->methodState = METHOD_MAY_CONT; ret->decision = DECISION_COND_SUCC; ret->allowNotifications = FALSE; return resp; }
static struct wpabuf * eap_eke_process_commit(struct eap_sm *sm, struct eap_eke_data *data, struct eap_method_ret *ret, const struct wpabuf *reqData, const u8 *payload, size_t payload_len) { struct wpabuf *resp; const u8 *pos, *end, *dhcomp; size_t prot_len; u8 *rpos; u8 key[EAP_EKE_MAX_KEY_LEN]; u8 pub[EAP_EKE_MAX_DH_LEN]; const u8 *password; size_t password_len; u8 id = eap_get_id(reqData); if (data->state != COMMIT) { wpa_printf(MSG_DEBUG, "EAP-EKE: EAP-EKE-Commit/Request received in unexpected state (%d)", data->state); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PROTO_ERROR); } wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Commit/Request"); password = eap_get_config_password(sm, &password_len); if (password == NULL) { wpa_printf(MSG_INFO, "EAP-EKE: No password configured!"); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PASSWD_NOT_FOUND); } pos = payload; end = payload + payload_len; if (pos + data->sess.dhcomp_len > end) { wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Commit"); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PROTO_ERROR); } wpa_hexdump(MSG_DEBUG, "EAP-EKE: DHComponent_S", pos, data->sess.dhcomp_len); dhcomp = pos; pos += data->sess.dhcomp_len; wpa_hexdump(MSG_DEBUG, "EAP-EKE: CBValue", pos, end - pos); /* * temp = prf(0+, password) * key = prf+(temp, ID_S | ID_P) */ if (eap_eke_derive_key(&data->sess, password, password_len, data->serverid, data->serverid_len, data->peerid, data->peerid_len, key) < 0) { wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive key"); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } /* * y_p = g ^ x_p (mod p) * x_p = random number 2 .. p-1 */ if (eap_eke_dh_init(data->sess.dhgroup, data->dh_priv, pub) < 0) { wpa_printf(MSG_INFO, "EAP-EKE: Failed to initialize DH"); os_memset(key, 0, sizeof(key)); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } if (eap_eke_shared_secret(&data->sess, key, data->dh_priv, dhcomp) < 0) { wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive shared secret"); os_memset(key, 0, sizeof(key)); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } if (eap_eke_derive_ke_ki(&data->sess, data->serverid, data->serverid_len, data->peerid, data->peerid_len) < 0) { wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive Ke/Ki"); os_memset(key, 0, sizeof(key)); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Commit/Response"); resp = eap_eke_build_msg(data, id, data->sess.dhcomp_len + data->sess.pnonce_len, EAP_EKE_COMMIT); if (resp == NULL) { os_memset(key, 0, sizeof(key)); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } /* DHComponent_P = Encr(key, y_p) */ rpos = wpabuf_put(resp, data->sess.dhcomp_len); if (eap_eke_dhcomp(&data->sess, key, pub, rpos) < 0) { wpabuf_free(resp); wpa_printf(MSG_INFO, "EAP-EKE: Failed to build DHComponent_P"); os_memset(key, 0, sizeof(key)); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } os_memset(key, 0, sizeof(key)); wpa_hexdump(MSG_DEBUG, "EAP-EKE: DHComponent_P", rpos, data->sess.dhcomp_len); if (random_get_bytes(data->nonce_p, data->sess.nonce_len)) { wpabuf_free(resp); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_P", data->nonce_p, data->sess.nonce_len); prot_len = wpabuf_tailroom(resp); if (eap_eke_prot(&data->sess, data->nonce_p, data->sess.nonce_len, wpabuf_put(resp, 0), &prot_len) < 0) { wpabuf_free(resp); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } wpa_hexdump(MSG_DEBUG, "EAP-EKE: PNonce_P", wpabuf_put(resp, 0), prot_len); wpabuf_put(resp, prot_len); /* TODO: CBValue */ if (wpabuf_resize(&data->msgs, wpabuf_len(reqData) + wpabuf_len(resp)) < 0) { wpabuf_free(resp); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } wpabuf_put_buf(data->msgs, reqData); wpabuf_put_buf(data->msgs, resp); eap_eke_state(data, CONFIRM); return resp; }
static struct wpabuf * eap_eke_process_id(struct eap_eke_data *data, struct eap_method_ret *ret, const struct wpabuf *reqData, const u8 *payload, size_t payload_len) { struct wpabuf *resp; unsigned num_prop, i; const u8 *pos, *end; const u8 *prop = NULL; u8 idtype; u8 id = eap_get_id(reqData); if (data->state != IDENTITY) { return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PROTO_ERROR); } wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-ID/Request"); if (payload_len < 2 + 4) { wpa_printf(MSG_DEBUG, "EAP-EKE: Too short ID/Request Data"); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PROTO_ERROR); } pos = payload; end = payload + payload_len; num_prop = *pos++; pos++; /* Ignore Reserved field */ if (pos + num_prop * 4 > end) { wpa_printf(MSG_DEBUG, "EAP-EKE: Too short ID/Request Data (num_prop=%u)", num_prop); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PROTO_ERROR); } for (i = 0; i < num_prop; i++) { const u8 *tmp = pos; wpa_printf(MSG_DEBUG, "EAP-EKE: Proposal #%u: dh=%u encr=%u prf=%u mac=%u", i, pos[0], pos[1], pos[2], pos[3]); pos += 4; if ((data->dhgroup && data->dhgroup != *tmp) || !eap_eke_supp_dhgroup(*tmp)) continue; tmp++; if ((data->encr && data->encr != *tmp) || !eap_eke_supp_encr(*tmp)) continue; tmp++; if ((data->prf && data->prf != *tmp) || !eap_eke_supp_prf(*tmp)) continue; tmp++; if ((data->mac && data->mac != *tmp) || !eap_eke_supp_mac(*tmp)) continue; prop = tmp - 3; if (eap_eke_session_init(&data->sess, prop[0], prop[1], prop[2], prop[3]) < 0) { prop = NULL; continue; } wpa_printf(MSG_DEBUG, "EAP-EKE: Selected proposal"); break; } if (prop == NULL) { wpa_printf(MSG_DEBUG, "EAP-EKE: No acceptable proposal found"); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_NO_PROPOSAL_CHOSEN); } pos += (num_prop - i - 1) * 4; if (pos == end) { wpa_printf(MSG_DEBUG, "EAP-EKE: Too short ID/Request Data to include IDType/Identity"); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PROTO_ERROR); } idtype = *pos++; wpa_printf(MSG_DEBUG, "EAP-EKE: Server IDType %u", idtype); wpa_hexdump_ascii(MSG_DEBUG, "EAP-EKE: Server Identity", pos, end - pos); os_free(data->serverid); data->serverid = os_malloc(end - pos); if (data->serverid == NULL) { return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } os_memcpy(data->serverid, pos, end - pos); data->serverid_len = end - pos; wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-ID/Response"); resp = eap_eke_build_msg(data, id, 2 + 4 + 1 + data->peerid_len, EAP_EKE_ID); if (resp == NULL) { return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } wpabuf_put_u8(resp, 1); /* NumProposals */ wpabuf_put_u8(resp, 0); /* Reserved */ wpabuf_put_data(resp, prop, 4); /* Selected Proposal */ wpabuf_put_u8(resp, EAP_EKE_ID_NAI); if (data->peerid) wpabuf_put_data(resp, data->peerid, data->peerid_len); wpabuf_free(data->msgs); data->msgs = wpabuf_alloc(wpabuf_len(reqData) + wpabuf_len(resp)); if (data->msgs == NULL) { wpabuf_free(resp); return eap_eke_build_fail(data, ret, id, EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR); } wpabuf_put_buf(data->msgs, reqData); wpabuf_put_buf(data->msgs, resp); eap_eke_state(data, COMMIT); return resp; }