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_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; }