tests: added check for SRP 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, 275 insertions, 1 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index 6a7e19c35c..63719a7efe 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -99,7 +99,8 @@ 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 rehandshake-switch-psk-id
+	 send-client-cert custom-urls-override hex rehandshake-switch-psk-id \
+	 rehandshake-switch-srp-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-srp-id.c b/tests/rehandshake-switch-srp-id.c
new file mode 100644
index 0000000000..c4202bce88
--- /dev/null
+++ b/tests/rehandshake-switch-srp-id.c
@@ -0,0 +1,273 @@
+/*
+ * 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"
+
+#ifndef ENABLE_SRP
+
+void doit(void)
+{
+	exit(77);
+}
+
+#else
+
+/* 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"
+
+
+#define VERIF_TEST1 "CEqjUZBlkQCocfOR0E4AsPZKOFYPGjKFMHW7KDcnpE4sH4.iGMbkygb/bViRNjskF9/TQdD46Mvlt6pLs5MZoTn8mO3G.RGyXdWuIrhnVn29p41Cpc5RhTLaeUm3asW6LF60VTKnGERC0eB37xZUsaTpzmaTNdD4mOoYCN3bD9Y"
+#define VERIF_TEST2 "EEbMk8afwXz/0oV5Yo9To7V6c6xkYid8meqEByxM33XjM4xeKUjeN7Ft2.xvjo4S6Js7mEs9Ov.uZtBp3ugCAbvl6G7bdfYF6z.tAD4mNYhH7iI7SwQy.ntmbJ3uJ1qB5MHW7ajSdWvA7l3SSsyyAVMe9HVQcxZKJRf4mzwm06s"
+
+#define SALT_TEST1 "3a3xX3Myzb9YJn5X0R7sbx"
+#define SALT_TEST2 "25J9FArvl1ZDrTSFsvZ4Jb"
+
+#define PRIME "Ewl2hcjiutMd3Fu2lgFnUXWSc67TVyy2vwYCKoS9MLsrdJVT9RgWTCuEqWJrfB6uE3LsE9GkOlaZabS7M29sj5TnzUqOLJMjiwEzArfiLr9WbMRANlF68N5AVLcPWvNx6Zjl3m5Scp0BzJBz9TkgfhzKJZ.WtP3Mv/67I/0wmRZ"
+gnutls_datum_t tprime = 
+{
+	.data = (void*)PRIME,
+	.size = sizeof(PRIME)-1
+};
+
+gnutls_datum_t test1_verif = 
+{
+	.data = (void*)VERIF_TEST1,
+	.size = sizeof(VERIF_TEST1)-1
+};
+
+gnutls_datum_t test2_verif = 
+{
+	.data = (void*)VERIF_TEST2,
+	.size = sizeof(VERIF_TEST2)-1
+};
+
+gnutls_datum_t test1_salt = 
+{
+	.data = (void*)SALT_TEST1,
+	.size = sizeof(SALT_TEST1)-1
+};
+
+gnutls_datum_t test2_salt = 
+{
+	.data = (void*)SALT_TEST2,
+	.size = sizeof(SALT_TEST2)-1
+};
+
+static int
+srpfunc(gnutls_session_t session, const char *username,
+	gnutls_datum_t *salt, gnutls_datum_t *verifier, gnutls_datum_t *generator, gnutls_datum_t *prime)
+{
+	int ret;
+	if (debug)
+		printf("srp: username %s\n", username);
+
+	generator->data = gnutls_malloc(1);
+	generator->data[0] = 2;
+	generator->size = 1;
+
+	ret = gnutls_srp_base64_decode2(&tprime, prime);
+	if (ret < 0)
+		fail("error in gnutls_srp_base64_decode2 -prime\n");
+
+	if (strcmp(username, "test1") == 0) {
+		ret = gnutls_srp_base64_decode2(&test1_verif, verifier);
+		if (ret < 0)
+			fail("error in gnutls_srp_base64_decode2 -verif\n");
+
+
+		ret = gnutls_srp_base64_decode2(&test1_salt, salt);
+		if (ret < 0)
+			fail("error in gnutls_srp_base64_decode2 -salt\n");
+	} else if (strcmp(username, "test2") == 0) {
+		ret = gnutls_srp_base64_decode2(&test2_verif, verifier);
+		if (ret < 0)
+			fail("error in gnutls_srp_base64_decode2 -verif\n");
+
+		ret = gnutls_srp_base64_decode2(&test2_salt, salt);
+		if (ret < 0)
+			fail("error in gnutls_srp_base64_decode2 -salt\n");
+	} else {
+		fail("Unknown username %s\n", username);
+	}
+
+	return 0;
+}
+
+static void try(const char *prio, gnutls_kx_algorithm_t kx, unsigned allow_change)
+{
+	int ret;
+	/* Server stuff. */
+	gnutls_srp_server_credentials_t server_srp_cred;
+	gnutls_certificate_credentials_t server_x509_cred;
+	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_certificate_credentials_t client_x509_cred;
+	gnutls_srp_client_credentials_t client_srp_cred;
+	gnutls_srp_client_credentials_t client_srp_cred2;
+	gnutls_session_t client;
+	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_srp_allocate_server_credentials(&server_srp_cred);
+
+	gnutls_certificate_allocate_credentials(&server_x509_cred);
+	gnutls_certificate_set_x509_key_mem(server_x509_cred,
+					    &server_cert, &server_key,
+					    GNUTLS_X509_FMT_PEM);
+
+	gnutls_dh_params_init(&dh_params);
+	gnutls_dh_params_import_pkcs3(dh_params, &p3, GNUTLS_X509_FMT_PEM);
+	gnutls_certificate_set_dh_params(server_x509_cred, dh_params);
+
+	gnutls_srp_set_server_credentials_function(server_srp_cred, srpfunc);
+
+	if (allow_change)
+		gnutls_init(&server, GNUTLS_SERVER|GNUTLS_ALLOW_ID_CHANGE);
+	else
+		gnutls_init(&server, GNUTLS_SERVER);
+	gnutls_credentials_set(server, GNUTLS_CRD_SRP,
+			       server_srp_cred);
+	gnutls_credentials_set(server, GNUTLS_CRD_CERTIFICATE,
+			       server_x509_cred);
+
+	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 */
+
+	gnutls_srp_allocate_client_credentials(&client_srp_cred);
+	gnutls_srp_allocate_client_credentials(&client_srp_cred2);
+
+	gnutls_srp_set_client_credentials(client_srp_cred, "test1", "test");
+	gnutls_srp_set_client_credentials(client_srp_cred2, "test2", "test");
+
+	ret = gnutls_init(&client, GNUTLS_CLIENT);
+	if (ret < 0)
+		exit(1);
+
+	ret = gnutls_credentials_set(client, GNUTLS_CRD_SRP, client_srp_cred);
+	if (ret < 0)
+		exit(1);
+
+	ret = gnutls_certificate_allocate_credentials(&client_x509_cred);
+	if (ret < 0)
+		exit(1);
+
+	ret = gnutls_certificate_set_x509_trust_mem(client_x509_cred, &ca_cert, GNUTLS_X509_FMT_PEM);
+	if (ret < 0)
+		exit(1);
+
+	ret = gnutls_credentials_set(client, GNUTLS_CRD_CERTIFICATE,
+			       client_x509_cred);
+	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_SRP, client_srp_cred2);
+	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_certificate_free_credentials(server_x509_cred);
+	gnutls_srp_free_server_credentials(server_srp_cred);
+
+	gnutls_certificate_free_credentials(client_x509_cred);
+	gnutls_srp_free_client_credentials(client_srp_cred);
+	gnutls_srp_free_client_credentials(client_srp_cred2);
+	gnutls_dh_params_deinit(dh_params);
+}
+
+void doit(void)
+{
+	global_init();
+	/* Allow change of ID */
+	try("NORMAL:-KX-ALL:+SRP", GNUTLS_KX_SRP, 0);
+	reset_buffers();
+	try("NORMAL:-KX-ALL:+SRP-RSA", GNUTLS_KX_SRP_RSA, 0);
+	reset_buffers();
+
+	/* Prohibit (default) change of ID */
+	try("NORMAL:-KX-ALL:+SRP", GNUTLS_KX_SRP, 1);
+	reset_buffers();
+	try("NORMAL:-KX-ALL:+SRP-RSA", GNUTLS_KX_SRP_RSA, 1);
+	reset_buffers();
+	gnutls_global_deinit();
+}
+
+#endif