server auth: disable TLS 1.3 if no signature algorithm is usable

This is a server side counterpart of
005a4d04145707daad9588acedfdb5f6cd97c80c.

Instead of signalling an error when no algorithm is usable in TLS 1.3,
it downgrades the session to TLS 1.2 with a warning.

Signed-off-by: Daiki Ueno <dueno@redhat.com>

1 files changed, 375 insertions, 0 deletions

diff --git a/tests/pkcs11/tls-neg-pkcs11-no-key.c b/tests/pkcs11/tls-neg-pkcs11-no-key.c
new file mode 100644
index 0000000000..af32c33ab9
--- /dev/null
+++ b/tests/pkcs11/tls-neg-pkcs11-no-key.c
@@ -0,0 +1,375 @@
+/*
+ * Copyright (C) 2017-2019 Red Hat, Inc.
+ *
+ * Author: Daiki Ueno
+ *
+ * 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 Lesser General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#if defined(_WIN32)
+
+int main()
+{
+	exit(77);
+}
+
+#else
+
+#include <string.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <gnutls/gnutls.h>
+#include <gnutls/dtls.h>
+#include <signal.h>
+#include <assert.h>
+
+#include "cert-common.h"
+#include "tls13/ext-parse.h"
+#include "pkcs11/softhsm.h"
+#include "utils.h"
+
+/* This program tests that TLS 1.3 is disabled as expected.
+ */
+
+static void server_log_func(int level, const char *str)
+{
+	fprintf(stderr, "server|<%d>| %s", level, str);
+}
+
+static void client_log_func(int level, const char *str)
+{
+	fprintf(stderr, "client|<%d>| %s", level, str);
+}
+
+#define P11LIB "libpkcs11mock2.so"
+
+#define PIN "1234"
+
+#define CONFIG_NAME "softhsm-neg-no-key"
+#define CONFIG CONFIG_NAME".config"
+
+static
+int pin_func(void *userdata, int attempt, const char *url, const char *label,
+	     unsigned flags, char *pin, size_t pin_max)
+{
+	if (attempt == 0) {
+		strcpy(pin, PIN);
+		return 0;
+	}
+	return -1;
+}
+
+static void client(int fd)
+{
+	int ret;
+	gnutls_session_t session;
+	gnutls_certificate_credentials_t x509_cred;
+
+	global_init();
+
+	if (debug) {
+		gnutls_global_set_log_function(client_log_func);
+		gnutls_global_set_log_level(7);
+	}
+
+	ret = gnutls_certificate_allocate_credentials(&x509_cred);
+	if (ret < 0)
+		exit(1);
+
+	ret = gnutls_certificate_set_x509_trust_mem(x509_cred, &ca_cert, GNUTLS_X509_FMT_PEM);
+	if (ret < 0)
+		exit(1);
+
+	/* Initialize TLS session
+	 */
+	assert(gnutls_init(&session, GNUTLS_CLIENT)>=0);
+
+	gnutls_handshake_set_timeout(session, 20 * 1000);
+
+	ret = gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
+	if (ret < 0)
+		fail("cannot set credentials\n");
+
+	ret = gnutls_priority_set_direct(session, "NORMAL:-VERS-ALL:+VERS-TLS1.3:+VERS-TLS1.2", NULL);
+	if (ret < 0)
+		fail("cannot set priorities\n");
+
+
+	gnutls_transport_set_int(session, fd);
+
+	/* Perform the TLS handshake
+	 */
+	do {
+		ret = gnutls_handshake(session);
+	}
+	while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+
+	if (ret != 0)
+		fail("handshake failed: %s\n", gnutls_strerror(ret));
+
+	if (debug)
+		success("client handshake completed\n");
+
+	if (gnutls_protocol_get_version(session) == GNUTLS_TLS1_2) {
+		if (debug)
+			success("session is downgraded to TLS 1.2\n");
+	} else
+		fail("session is NOT downgraded to TLS 1.2\n");
+
+	do {
+		ret = gnutls_bye(session, GNUTLS_SHUT_WR);
+	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
+
+	close(fd);
+
+	gnutls_deinit(session);
+
+	gnutls_global_deinit();
+}
+
+static void server(int fd)
+{
+	int ret;
+	const char *lib;
+	gnutls_x509_crt_t crt;
+	gnutls_x509_privkey_t key;
+	gnutls_datum_t tmp;
+	gnutls_session_t session;
+	gnutls_certificate_credentials_t x509_cred;
+
+	/* this must be called once in the program
+	 */
+	global_init();
+
+	if (debug) {
+		gnutls_global_set_log_function(server_log_func);
+		gnutls_global_set_log_level(4711);
+	}
+
+	/* point to SoftHSM token that libpkcs11mock2.so internally uses */
+	setenv(SOFTHSM_ENV, CONFIG, 1);
+
+	gnutls_pkcs11_set_pin_function(pin_func, NULL);
+
+	lib = getenv("P11MOCKLIB2");
+	if (lib == NULL)
+		lib = P11LIB;
+
+	ret = gnutls_pkcs11_init(GNUTLS_PKCS11_FLAG_MANUAL, NULL);
+	if (ret != 0) {
+		fail("%d: %s\n", ret, gnutls_strerror(ret));
+		exit(1);
+	}
+
+	ret = gnutls_pkcs11_add_provider(lib, NULL);
+	if (ret != 0) {
+		fail("%d: %s\n", ret, gnutls_strerror(ret));
+		exit(1);
+	}
+
+	ret = gnutls_x509_crt_init(&crt);
+	if (ret < 0) {
+		fprintf(stderr,
+			"gnutls_x509_crt_init: %s\n", gnutls_strerror(ret));
+		exit(1);
+	}
+
+	ret = gnutls_x509_crt_import(crt, &server_ca3_cert, GNUTLS_X509_FMT_PEM);
+	if (ret < 0) {
+		fprintf(stderr,
+			"gnutls_x509_crt_import: %s\n", gnutls_strerror(ret));
+		exit(1);
+	}
+
+	if (debug) {
+		gnutls_x509_crt_print(crt, GNUTLS_CRT_PRINT_ONELINE, &tmp);
+
+		printf("\tCertificate: %.*s\n", tmp.size, tmp.data);
+		gnutls_free(tmp.data);
+	}
+
+	ret = gnutls_x509_privkey_init(&key);
+	if (ret < 0) {
+		fprintf(stderr,
+			"gnutls_x509_privkey_init: %s\n", gnutls_strerror(ret));
+		exit(1);
+	}
+
+	ret = gnutls_x509_privkey_import(key, &server_ca3_key, GNUTLS_X509_FMT_PEM);
+	if (ret < 0) {
+		fprintf(stderr,
+			"gnutls_x509_privkey_import: %s\n",
+			gnutls_strerror(ret));
+		exit(1);
+	}
+
+	/* initialize softhsm token */
+	ret = gnutls_pkcs11_token_init(SOFTHSM_URL, PIN, "test");
+	if (ret < 0) {
+		fail("gnutls_pkcs11_token_init: %s\n", gnutls_strerror(ret));
+		exit(1);
+	}
+
+	ret =
+	    gnutls_pkcs11_token_set_pin(SOFTHSM_URL, NULL, PIN,
+					GNUTLS_PIN_USER);
+	if (ret < 0) {
+		fail("gnutls_pkcs11_token_set_pin: %s\n", gnutls_strerror(ret));
+		exit(1);
+	}
+
+	ret = gnutls_pkcs11_copy_x509_crt(SOFTHSM_URL, crt, "cert",
+					  GNUTLS_PKCS11_OBJ_FLAG_MARK_PRIVATE |
+					  GNUTLS_PKCS11_OBJ_FLAG_LOGIN);
+	if (ret < 0) {
+		fail("gnutls_pkcs11_copy_x509_crt: %s\n", gnutls_strerror(ret));
+		exit(1);
+	}
+
+	ret =
+	    gnutls_pkcs11_copy_x509_privkey(SOFTHSM_URL, key, "cert",
+					    GNUTLS_KEY_DIGITAL_SIGNATURE |
+					    GNUTLS_KEY_KEY_ENCIPHERMENT,
+					    GNUTLS_PKCS11_OBJ_FLAG_MARK_PRIVATE
+					    |
+					    GNUTLS_PKCS11_OBJ_FLAG_MARK_SENSITIVE
+					    | GNUTLS_PKCS11_OBJ_FLAG_LOGIN);
+	if (ret < 0) {
+		fail("gnutls_pkcs11_copy_x509_privkey: %s\n",
+		     gnutls_strerror(ret));
+		exit(1);
+	}
+
+	gnutls_x509_crt_deinit(crt);
+	gnutls_x509_privkey_deinit(key);
+
+	assert(gnutls_certificate_allocate_credentials(&x509_cred)>=0);
+
+	gnutls_init(&session, GNUTLS_SERVER);
+
+	gnutls_handshake_set_timeout(session, 20 * 1000);
+
+	assert(gnutls_certificate_set_x509_key_file(x509_cred,
+						    SOFTHSM_URL
+						    ";object=cert;object-type=cert",
+						    SOFTHSM_URL
+						    ";object=cert;object-type=private;pin-value="
+						    PIN,
+						    GNUTLS_X509_FMT_DER)>=0);
+
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
+
+	/* avoid calling all the priority functions, since the defaults
+	 * are adequate.
+	 */
+	gnutls_priority_set_direct(session, "NORMAL:-VERS-ALL:+VERS-TLS1.3:+VERS-TLS1.2", NULL);
+
+	gnutls_transport_set_int(session, fd);
+
+	do {
+		ret = gnutls_handshake(session);
+	} while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
+
+	if (ret != 0)
+		fail("handshake failed: %s\n", gnutls_strerror(ret));
+
+	if (debug)
+		success("server handshake completed\n");
+
+	if (gnutls_protocol_get_version(session) == GNUTLS_TLS1_2) {
+		if (debug)
+			success("session is downgraded to TLS 1.2\n");
+	} else
+		fail("session is NOT downgraded to TLS 1.2\n");
+
+	do {
+		ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
+	} while (ret == GNUTLS_E_AGAIN || ret == GNUTLS_E_INTERRUPTED);
+
+	close(fd);
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(x509_cred);
+
+	gnutls_global_deinit();
+
+	if (debug)
+		success("server: client/server hello were verified\n");
+}
+
+void doit(void)
+{
+	const char *bin;
+	char buf[128];
+	int fd[2];
+	int ret;
+	pid_t child;
+	int status = 0;
+
+	/* check if softhsm module is loadable */
+	(void) softhsm_lib();
+
+	/* initialize SoftHSM token that libpkcs11mock2.so internally uses */
+	bin = softhsm_bin();
+
+	set_softhsm_conf(CONFIG);
+	snprintf(buf, sizeof(buf),
+		 "%s --init-token --slot 0 --label test --so-pin " PIN " --pin "
+		 PIN, bin);
+	system(buf);
+
+	signal(SIGCHLD, SIG_IGN);
+	signal(SIGPIPE, SIG_IGN);
+
+	ret = socketpair(AF_UNIX, SOCK_STREAM, 0, fd);
+	if (ret < 0) {
+		perror("socketpair");
+		exit(1);
+	}
+
+	child = fork();
+	if (child < 0) {
+		perror("fork");
+		fail("fork");
+		exit(1);
+	}
+
+	if (child) {
+		/* parent */
+		close(fd[1]);
+		server(fd[0]);
+		kill(child, SIGTERM);
+		wait(&status);
+		check_wait_status(status);
+	} else {
+		close(fd[0]);
+		client(fd[1]);
+		exit(0);
+	}
+
+}
+#endif				/* _WIN32 */