tests: added check for PSK ID change during rehandshake

The tests make sure that username changes are allowed if the
flag GNUTLS_ALLOW_ID_CHANGE is specified, and prohibited otherwise.

2 files changed, 192 insertions, 1 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 44e7a0fc1f..6a7e19c35c 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -99,7 +99,7 @@ ctests = mini-record-2 simple gc set_pkcs12_cred certder certuniqueid	\
 	 dh-params rehandshake-ext-secret pcert-list session-export-funcs \
 	 handshake-false-start version-checks key-material-dtls key-material-set-dtls \
 	 system-prio-file name-constraints-merge crl-basic crq-basic \
-	 send-client-cert custom-urls-override hex
+	 send-client-cert custom-urls-override hex rehandshake-switch-psk-id
 
 if HAVE_SECCOMP_TESTS
 ctests += dtls-with-seccomp tls-with-seccomp dtls-client-with-seccomp tls-client-with-seccomp
diff --git a/tests/rehandshake-switch-psk-id.c b/tests/rehandshake-switch-psk-id.c
new file mode 100644
index 0000000000..4b2a50e2e0
--- /dev/null
+++ b/tests/rehandshake-switch-psk-id.c
@@ -0,0 +1,191 @@
+/*
+ * Copyright (C) 2016 Red Hat, Inc.
+ *
+ * Author: Nikos Mavrogiannopoulos
+ *
+ * This file is part of GnuTLS.
+ *
+ * GnuTLS is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GnuTLS is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GnuTLS; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <gnutls/gnutls.h>
+#include "utils.h"
+#include "eagain-common.h"
+
+/* This test checks whether the server switching certificates is detected
+ * by the client */
+
+const char *side;
+
+static void tls_log_func(int level, const char *str)
+{
+	fprintf(stderr, "%s|<%d>| %s", side, level, str);
+}
+
+#include "cert-common.h"
+
+static int
+pskfunc(gnutls_session_t session, const char *username,
+	gnutls_datum_t * key)
+{
+	if (debug)
+		printf("psk: username %s\n", username);
+	key->data = gnutls_malloc(4);
+	key->data[0] = 0xDE;
+	key->data[1] = 0xAD;
+	key->data[2] = 0xBE;
+	key->data[3] = 0xEF;
+	key->size = 4;
+	return 0;
+}
+
+static void try(const char *prio, gnutls_kx_algorithm_t kx, unsigned allow_change)
+{
+	int ret;
+	/* Server stuff. */
+	gnutls_psk_server_credentials_t serverpskcred;
+	gnutls_dh_params_t dh_params;
+	const gnutls_datum_t p3 =
+	    { (unsigned char *) pkcs3, strlen(pkcs3) };
+	gnutls_session_t server;
+	int sret = GNUTLS_E_AGAIN;
+	/* Client stuff. */
+	gnutls_psk_client_credentials_t clientpskcred;
+	gnutls_psk_client_credentials_t clientpskcred2;
+	gnutls_session_t client;
+	const gnutls_datum_t key = { (void *) "DEADBEEF", 8 };
+	int cret = GNUTLS_E_AGAIN;
+
+	/* General init. */
+	gnutls_global_set_log_function(tls_log_func);
+	if (debug)
+		gnutls_global_set_log_level(6);
+
+	/* Init server */
+	gnutls_psk_allocate_server_credentials(&serverpskcred);
+
+	gnutls_psk_set_server_credentials_function(serverpskcred,
+						   pskfunc);
+
+	gnutls_dh_params_init(&dh_params);
+	gnutls_dh_params_import_pkcs3(dh_params, &p3, GNUTLS_X509_FMT_PEM);
+	gnutls_psk_set_server_dh_params(serverpskcred, dh_params);
+
+	if (allow_change)
+		gnutls_init(&server, GNUTLS_SERVER|GNUTLS_ALLOW_ID_CHANGE);
+	else
+		gnutls_init(&server, GNUTLS_SERVER);
+	gnutls_credentials_set(server, GNUTLS_CRD_PSK,
+			       serverpskcred);
+
+	gnutls_priority_set_direct(server,
+				   prio,
+				   NULL);
+	gnutls_transport_set_push_function(server, server_push);
+	gnutls_transport_set_pull_function(server, server_pull);
+	gnutls_transport_set_ptr(server, server);
+
+	/* Init client */
+
+	ret = gnutls_psk_allocate_client_credentials(&clientpskcred);
+	if (ret < 0)
+		exit(1);
+
+	gnutls_psk_set_client_credentials(clientpskcred, "test1", &key,
+					  GNUTLS_PSK_KEY_HEX);
+
+	ret = gnutls_psk_allocate_client_credentials(&clientpskcred2);
+	if (ret < 0)
+		exit(1);
+
+	gnutls_psk_set_client_credentials(clientpskcred2, "test2", &key,
+					  GNUTLS_PSK_KEY_HEX);
+
+	ret = gnutls_init(&client, GNUTLS_CLIENT);
+	if (ret < 0)
+		exit(1);
+
+	ret = gnutls_credentials_set(client, GNUTLS_CRD_PSK,
+			       clientpskcred);
+	if (ret < 0)
+		exit(1);
+
+	ret = gnutls_priority_set_direct(client, prio, NULL);
+	if (ret < 0)
+		exit(1);
+
+	gnutls_transport_set_push_function(client, client_push);
+	gnutls_transport_set_pull_function(client, client_pull);
+	gnutls_transport_set_ptr(client, client);
+
+	HANDSHAKE(client, server);
+
+	if (gnutls_kx_get(client) != kx) {
+		fail("got unexpected key exchange algorithm: %s (expected %s)\n",
+			gnutls_kx_get_name(gnutls_kx_get(client)),
+			gnutls_kx_get_name(kx));
+		exit(1);
+	}
+
+	/* switch client's username and rehandshake */
+	ret = gnutls_credentials_set(client, GNUTLS_CRD_PSK,
+			       clientpskcred2);
+	if (ret < 0)
+		exit(1);
+
+	if (allow_change) {
+		HANDSHAKE(client, server);
+	} else {
+		HANDSHAKE_EXPECT(client, server, GNUTLS_E_AGAIN, GNUTLS_E_SESSION_USER_ID_CHANGED);
+	}
+
+	gnutls_deinit(client);
+	gnutls_deinit(server);
+
+	gnutls_psk_free_server_credentials(serverpskcred);
+	gnutls_psk_free_client_credentials(clientpskcred);
+	gnutls_psk_free_client_credentials(clientpskcred2);
+	gnutls_dh_params_deinit(dh_params);
+}
+
+void doit(void)
+{
+	global_init();
+
+	/* Allow change of ID */
+	try("NORMAL:-KX-ALL:+PSK", GNUTLS_KX_PSK, 0);
+	reset_buffers();
+	try("NORMAL:-KX-ALL:+DHE-PSK", GNUTLS_KX_DHE_PSK, 0);
+	reset_buffers();
+	try("NORMAL:-KX-ALL:+ECDHE-PSK", GNUTLS_KX_ECDHE_PSK, 0);
+	reset_buffers();
+
+	/* Prohibit (default) change of ID */
+	try("NORMAL:-KX-ALL:+PSK", GNUTLS_KX_PSK, 1);
+	reset_buffers();
+	try("NORMAL:-KX-ALL:+DHE-PSK", GNUTLS_KX_DHE_PSK, 1);
+	reset_buffers();
+	try("NORMAL:-KX-ALL:+ECDHE-PSK", GNUTLS_KX_ECDHE_PSK, 1);
+	reset_buffers();
+	gnutls_global_deinit();
+}