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https://gitlab.torproject.org/tpo/core/tor.git
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On v3 link handshake, send the correct link certificate
Previously we'd send the _current_ link certificate, which would cause a handshaking failure when the TLS context rotated.
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ec61ae59a5
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@ -2021,6 +2021,24 @@ tor_tls_get_peer_cert,(tor_tls_t *tls))
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return tor_x509_cert_new(cert);
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}
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/** Return the cerficate we used on the connection, or NULL if somehow
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* we didn't use one. */
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tor_x509_cert_t *
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tor_tls_get_own_cert(tor_tls_t *tls)
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{
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X509 *cert = SSL_get_certificate(tls->ssl);
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tls_log_errors(tls, LOG_WARN, LD_HANDSHAKE,
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"getting own-connection certificate");
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if (!cert)
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return NULL;
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/* Fun inconsistency: SSL_get_peer_certificate increments the reference
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* count, but SSL_get_certificate does not. */
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X509 *duplicate = X509_dup(cert);
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if (BUG(duplicate == NULL))
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return NULL;
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return tor_x509_cert_new(duplicate);
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}
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/** Warn that a certificate lifetime extends through a certain range. */
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static void
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log_cert_lifetime(int severity, const X509 *cert, const char *problem)
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@ -198,6 +198,7 @@ int tor_tls_is_server(tor_tls_t *tls);
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void tor_tls_free(tor_tls_t *tls);
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int tor_tls_peer_has_cert(tor_tls_t *tls);
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MOCK_DECL(tor_x509_cert_t *,tor_tls_get_peer_cert,(tor_tls_t *tls));
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tor_x509_cert_t *tor_tls_get_own_cert(tor_tls_t *tls);
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int tor_tls_verify(int severity, tor_tls_t *tls, crypto_pk_t **identity);
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int tor_tls_check_lifetime(int severity,
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tor_tls_t *tls, int past_tolerance,
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@ -2137,7 +2137,9 @@ connection_or_send_netinfo,(or_connection_t *conn))
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int
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connection_or_send_certs_cell(or_connection_t *conn)
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{
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const tor_x509_cert_t *link_cert = NULL, *id_cert = NULL;
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const tor_x509_cert_t *global_link_cert = NULL, *id_cert = NULL,
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*using_link_cert = NULL;
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tor_x509_cert_t *own_link_cert = NULL;
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const uint8_t *link_encoded = NULL, *id_encoded = NULL;
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size_t link_len, id_len;
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var_cell_t *cell;
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@ -2149,9 +2151,15 @@ connection_or_send_certs_cell(or_connection_t *conn)
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if (! conn->handshake_state)
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return -1;
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const int conn_in_server_mode = ! conn->handshake_state->started_here;
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if (tor_tls_get_my_certs(conn_in_server_mode, &link_cert, &id_cert) < 0)
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if (tor_tls_get_my_certs(conn_in_server_mode,
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&global_link_cert, &id_cert) < 0)
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return -1;
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tor_x509_cert_get_der(link_cert, &link_encoded, &link_len);
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if (conn_in_server_mode) {
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using_link_cert = own_link_cert = tor_tls_get_own_cert(conn->tls);
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} else {
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using_link_cert = global_link_cert;
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}
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tor_x509_cert_get_der(using_link_cert, &link_encoded, &link_len);
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tor_x509_cert_get_der(id_cert, &id_encoded, &id_len);
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cell_len = 1 /* 1 byte: num certs in cell */ +
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@ -2179,6 +2187,7 @@ connection_or_send_certs_cell(or_connection_t *conn)
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connection_or_write_var_cell_to_buf(cell, conn);
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var_cell_free(cell);
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tor_x509_cert_free(own_link_cert);
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return 0;
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}
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@ -2258,10 +2267,10 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn,
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memcpy(auth1_getarray_type(auth), "AUTH0001", 8);
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{
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const tor_x509_cert_t *id_cert=NULL, *link_cert=NULL;
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const tor_x509_cert_t *id_cert=NULL;
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const common_digests_t *my_digests, *their_digests;
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const uint8_t *my_id, *their_id, *client_id, *server_id;
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if (tor_tls_get_my_certs(server, &link_cert, &id_cert))
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if (tor_tls_get_my_certs(server, NULL, &id_cert))
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goto err;
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my_digests = tor_x509_cert_get_id_digests(id_cert);
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their_digests =
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@ -2300,13 +2309,11 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn,
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{
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/* Digest of cert used on TLS link : 32 octets. */
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const tor_x509_cert_t *cert = NULL;
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tor_x509_cert_t *freecert = NULL;
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tor_x509_cert_t *cert = NULL;
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if (server) {
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tor_tls_get_my_certs(1, &cert, NULL);
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cert = tor_tls_get_own_cert(conn->tls);
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} else {
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freecert = tor_tls_get_peer_cert(conn->tls);
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cert = freecert;
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cert = tor_tls_get_peer_cert(conn->tls);
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}
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if (!cert) {
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log_warn(LD_OR, "Unable to find cert when making AUTH1 data.");
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@ -2316,8 +2323,7 @@ connection_or_compute_authenticate_cell_body(or_connection_t *conn,
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memcpy(auth->scert,
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tor_x509_cert_get_cert_digests(cert)->d[DIGEST_SHA256], 32);
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if (freecert)
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tor_x509_cert_free(freecert);
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tor_x509_cert_free(cert);
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}
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/* HMAC of clientrandom and serverrandom using master key : 32 octets */
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