tests: modified the MD5 signature algorithm negotiation teststmp-remove-sha224

Since GnuTLS can no longer negotiate MD5, we utilize a byte stream
of a connection which advertises MD5, and we make sure we detect the
right error code for the rejection of MD5 signature.

Signed-off-by: Nikos Mavrogiannopoulos <nmav@redhat.com>

4 files changed, 721 insertions, 335 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index e0c8f19bbb..47bd3089e3 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -117,7 +117,8 @@ ctests = mini-record-2 simple gc set_pkcs12_cred cert certuniqueid tls-neg-ext-k
 	 mini-dtls-fork mini-dtls-pthread mini-key-material x509cert-invalid \
 	 tls-ext-register tls-supplemental mini-dtls0-9 duplicate-extensions \
 	 mini-record-retvals mini-server-name tls-etm x509-cert-callback \
-	 sign-md5-rep privkey-keygen mini-tls-nonblock no-signal pkcs7-gen dtls-etm \
+	 client-sign-md5-rep \
+	 server-sign-md5-rep privkey-keygen mini-tls-nonblock no-signal pkcs7-gen dtls-etm \
 	 x509sign-verify-rsa x509sign-verify-ecdsa mini-alignment oids atfork prf psk-file \
 	 status-request status-request-ok status-request-missing sign-verify-ext \
 	 fallback-scsv pkcs8-key-decode urls dtls-rehandshake-cert \
diff --git a/tests/client-sign-md5-rep.c b/tests/client-sign-md5-rep.c
new file mode 100644
index 0000000000..b46613c148
--- /dev/null
+++ b/tests/client-sign-md5-rep.c
@@ -0,0 +1,499 @@
+/*
+ * Copyright (C) 2017 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 Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+/* This tests whether a client will reject a server advertising
+ * an MD5 signature algorithm */
+
+#if defined(_WIN32) || !defined(ENABLE_SSL2)
+
+/* socketpair isn't supported on Win32. */
+int main(int argc, char **argv)
+{
+	exit(77);
+}
+
+#else
+
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <gnutls/gnutls.h>
+#include <signal.h>
+#include <poll.h>
+#include <errno.h>
+
+#include "utils.h"
+#include "cert-common.h"
+
+pid_t child;
+
+static void tls_log_func(int level, const char *str)
+{
+	fprintf(stderr, "%s |<%d>| %s", "client", level,
+		str);
+}
+
+
+static unsigned char tls1_hello[] = { /* server hello etc. */
+0x16, 0x03, 0x03, 0x00, 0x39, 0x02, 0x00, 0x00, 0x35, 0x03, 0x03, 0x95, 0x66, 0x0A, 0x55, 0xBC,
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+0x00, 0x00, 0x00};
+
+static void server(int sd)
+{
+	char buf[1024];
+	int ret;
+	struct pollfd pfd;
+
+	/* send a TLS 1.x message trace accepting RSA-MD5 */
+
+	ret = send(sd, tls1_hello, sizeof(tls1_hello), 0);
+	if (ret < 0)
+		fail("error sending hello\n");
+
+	pfd.fd = sd;
+	pfd.events = POLLIN;
+	pfd.revents = 0;
+
+	do {
+		ret = poll(&pfd, 1, 10000);
+	} while (ret == -1 && errno == EINTR);
+
+	if (ret == -1 || ret == 0) {
+		fail("timeout waiting for reply\n");
+	}
+
+	success("sent hello\n");
+	ret = recv(sd, buf, sizeof(buf), 0);
+	if (ret < 0)
+		fail("error receiving alert\n");
+
+	success("all ok\n");
+
+	close(sd);
+}
+
+static void client(int sd)
+{
+	gnutls_certificate_credentials_t x509_cred;
+	gnutls_session_t session;
+	int ret;
+
+	/* this must be called once in the program
+	 */
+	global_init();
+
+	gnutls_global_set_log_function(tls_log_func);
+	if (debug)
+		gnutls_global_set_log_level(6);
+
+	gnutls_certificate_allocate_credentials(&x509_cred);
+	gnutls_certificate_set_x509_trust_mem(x509_cred, &ca3_cert,
+					      GNUTLS_X509_FMT_PEM);
+
+	gnutls_certificate_set_x509_key_mem(x509_cred, &server_ca3_localhost_cert,
+					    &server_ca3_key,
+					    GNUTLS_X509_FMT_PEM);
+
+	gnutls_init(&session, GNUTLS_CLIENT);
+
+	/* avoid calling all the priority functions, since the defaults
+	 * are adequate.
+	 */
+	gnutls_priority_set_direct(session, "NORMAL:-VERS-ALL:+VERS-TLS1.2:-KX-ALL:+DHE-RSA:+AES-128-GCM", NULL);
+	gnutls_handshake_set_timeout(session, 20 * 1000);
+	gnutls_server_name_set(session, GNUTLS_NAME_DNS, "localhost", strlen("localhost"));
+
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
+
+	gnutls_transport_set_int(session, sd);
+	do {
+		ret = gnutls_handshake(session);
+	} while(ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
+
+	if (ret != GNUTLS_E_UNSUPPORTED_SIGNATURE_ALGORITHM) {
+		fail("server: Handshake returned unexpectedly: %s\n", gnutls_strerror(ret));
+	}
+
+	gnutls_alert_send_appropriate(session, ret);
+
+	close(sd);
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(x509_cred);
+
+	gnutls_global_deinit();
+
+	if (debug)
+		success("server: finished\n");
+}
+
+
+void doit(void)
+{
+	int sockets[2];
+	int err;
+
+	signal(SIGPIPE, SIG_IGN);
+
+	err = socketpair(AF_UNIX, SOCK_STREAM, 0, sockets);
+	if (err == -1) {
+		perror("socketpair");
+		fail("socketpair failed\n");
+		return;
+	}
+
+	child = fork();
+	if (child < 0) {
+		perror("fork");
+		fail("fork");
+		return;
+	}
+
+	if (child) {
+		int status;
+
+		client(sockets[1]);
+		wait(&status);
+		check_wait_status(status);
+	} else {
+		server(sockets[0]);
+		_exit(0);
+	}
+}
+
+#endif				/* _WIN32 */
diff --git a/tests/server-sign-md5-rep.c b/tests/server-sign-md5-rep.c
new file mode 100644
index 0000000000..4c80be3d37
--- /dev/null
+++ b/tests/server-sign-md5-rep.c
@@ -0,0 +1,220 @@
+/*
+ * Copyright (C) 2017 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 Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <stdlib.h>
+
+/* This tests whether a server will reject a client advertising
+ * MD5 signature algorithms only */
+
+#if defined(_WIN32) || !defined(ENABLE_SSL2)
+
+/* socketpair isn't supported on Win32. */
+int main(int argc, char **argv)
+{
+	exit(77);
+}
+
+#else
+
+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/wait.h>
+#include <unistd.h>
+#include <gnutls/gnutls.h>
+#include <signal.h>
+#include <poll.h>
+#include <errno.h>
+
+#include "utils.h"
+#include "cert-common.h"
+
+pid_t child;
+
+static void tls_log_func(int level, const char *str)
+{
+	fprintf(stderr, "%s |<%d>| %s", child ? "server" : "client", level,
+		str);
+}
+
+
+static unsigned char tls1_hello[] = {
+0x16, 0x03, 0x01, 0x01, 0x5E, 0x01, 0x00, 0x01, 0x5A, 0x03, 0x03, 0x59, 0x52, 0x41, 0x54, 0xD5,
+0x52, 0x62, 0x63, 0x69, 0x1B, 0x46, 0xBE, 0x33, 0xCC, 0xC4, 0xC3, 0xB3, 0x6C, 0xCD, 0xEC, 0x96,
+0xF7, 0x7A, 0xCA, 0xE9, 0xFB, 0x85, 0x95, 0x83, 0x51, 0xE4, 0x69, 0x00, 0x00, 0xD4, 0xC0, 0x30,
+0xCC, 0xA8, 0xC0, 0x8B, 0xC0, 0x14, 0xC0, 0x28, 0xC0, 0x77, 0xC0, 0x2F, 0xC0, 0x8A, 0xC0, 0x13,
+0xC0, 0x27, 0xC0, 0x76, 0xC0, 0x12, 0xC0, 0x2C, 0xC0, 0xAD, 0xCC, 0xA9, 0xC0, 0x87, 0xC0, 0x0A,
+0xC0, 0x24, 0xC0, 0x73, 0xC0, 0x2B, 0xC0, 0xAC, 0xC0, 0x86, 0xC0, 0x09, 0xC0, 0x23, 0xC0, 0x72,
+0xC0, 0x08, 0x00, 0x9D, 0xC0, 0x9D, 0xC0, 0x7B, 0x00, 0x35, 0x00, 0x3D, 0x00, 0x84, 0x00, 0xC0,
+0x00, 0x9C, 0xC0, 0x9C, 0xC0, 0x7A, 0x00, 0x2F, 0x00, 0x3C, 0x00, 0x41, 0x00, 0xBA, 0x00, 0x0A,
+0x00, 0x9F, 0xC0, 0x9F, 0xCC, 0xAA, 0xC0, 0x7D, 0x00, 0x39, 0x00, 0x6B, 0x00, 0x88, 0x00, 0xC4,
+0x00, 0x9E, 0xC0, 0x9E, 0xC0, 0x7C, 0x00, 0x33, 0x00, 0x67, 0x00, 0x45, 0x00, 0xBE, 0x00, 0x16,
+0x00, 0xA3, 0xC0, 0x81, 0x00, 0x38, 0x00, 0x6A, 0x00, 0x87, 0x00, 0xC3, 0x00, 0xA2, 0xC0, 0x80,
+0x00, 0x32, 0x00, 0x40, 0x00, 0x44, 0x00, 0xBD, 0x00, 0x13, 0x00, 0xA9, 0xC0, 0xA5, 0xCC, 0xAB,
+0xC0, 0x8F, 0x00, 0x8D, 0x00, 0xAF, 0xC0, 0x95, 0x00, 0xA8, 0xC0, 0xA4, 0xC0, 0x8E, 0x00, 0x8C,
+0x00, 0xAE, 0xC0, 0x94, 0x00, 0x8B, 0x00, 0xAB, 0xC0, 0xA7, 0xCC, 0xAD, 0xC0, 0x91, 0x00, 0x91,
+0x00, 0xB3, 0xC0, 0x97, 0x00, 0xAA, 0xC0, 0xA6, 0xC0, 0x90, 0x00, 0x90, 0x00, 0xB2, 0xC0, 0x96,
+0x00, 0x8F, 0xCC, 0xAC, 0xC0, 0x36, 0xC0, 0x38, 0xC0, 0x9B, 0xC0, 0x35, 0xC0, 0x37, 0xC0, 0x9A,
+0xC0, 0x34, 0x01, 0x00, 0x00, 0x5D, 0x00, 0x17, 0x00, 0x00, 0x00, 0x16, 0x00, 0x00, 0x00, 0x05,
+0x00, 0x05, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x13, 0x00, 0x11, 0x00, 0x00, 0x0E,
+0x77, 0x77, 0x77, 0x2E, 0x67, 0x6F, 0x6F, 0x67, 0x6C, 0x65, 0x2E, 0x63, 0x6F, 0x6D, 0xFF, 0x01,
+0x00, 0x01, 0x00, 0x00, 0x23, 0x00, 0x00, 0x00, 0x0A, 0x00, 0x08, 0x00, 0x06, 0x00, 0x17, 0x00,
+0x18, 0x00, 0x19, 0x00, 0x0B, 0x00, 0x02, 0x01, 0x00, 0x00, 0x0D, 0x00, 0x16, 0x00, 0x14, 0x01,
+0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01,
+0x01, 0x01, 0x01};
+
+static void client(int sd)
+{
+	char buf[1024];
+	int ret;
+	struct pollfd pfd;
+
+	/* send a TLS 1.x hello advertising RSA-MD5 */
+
+	ret = send(sd, tls1_hello, sizeof(tls1_hello), 0);
+	if (ret < 0)
+		fail("error sending hello\n");
+
+	pfd.fd = sd;
+	pfd.events = POLLIN;
+	pfd.revents = 0;
+
+	do {
+		ret = poll(&pfd, 1, 10000);
+	} while (ret == -1 && errno == EINTR);
+
+	if (ret == -1 || ret == 0) {
+		fail("timeout waiting for reply\n");
+	}
+
+	success("sent hello\n");
+	ret = recv(sd, buf, sizeof(buf), 0);
+	if (ret < 0)
+		fail("error receiving alert\n");
+
+	success("received reply\n");
+
+	if (ret < 7)
+		fail("error in size of received alert\n");
+
+	if (buf[0] != 0x15 || buf[1] != 0x03)
+		fail("error in received alert data\n");
+
+	success("all ok\n");
+
+	close(sd);
+}
+
+static void server(int sd)
+{
+	gnutls_certificate_credentials_t x509_cred;
+	gnutls_session_t session;
+	int ret;
+
+	/* this must be called once in the program
+	 */
+	global_init();
+
+	gnutls_global_set_log_function(tls_log_func);
+	if (debug)
+		gnutls_global_set_log_level(6);
+
+	gnutls_certificate_allocate_credentials(&x509_cred);
+	gnutls_certificate_set_x509_trust_mem(x509_cred, &ca3_cert,
+					      GNUTLS_X509_FMT_PEM);
+
+	gnutls_certificate_set_x509_key_mem(x509_cred, &server_ca3_localhost_cert,
+					    &server_ca3_key,
+					    GNUTLS_X509_FMT_PEM);
+
+	gnutls_init(&session, GNUTLS_SERVER);
+
+	/* avoid calling all the priority functions, since the defaults
+	 * are adequate.
+	 */
+	gnutls_priority_set_direct(session, "NORMAL:-RSA", NULL);
+	gnutls_handshake_set_timeout(session, 20 * 1000);
+
+	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
+
+	gnutls_transport_set_int(session, sd);
+	do {
+		ret = gnutls_handshake(session);
+	} while(ret == GNUTLS_E_INTERRUPTED || ret == GNUTLS_E_AGAIN);
+
+	if (ret != GNUTLS_E_NO_CIPHER_SUITES) {
+		fail("server: Handshake succeeded unexpectedly: %s\n", gnutls_strerror(ret));
+	}
+
+	gnutls_alert_send_appropriate(session, ret);
+
+	close(sd);
+	gnutls_deinit(session);
+
+	gnutls_certificate_free_credentials(x509_cred);
+
+	gnutls_global_deinit();
+
+	if (debug)
+		success("server: finished\n");
+}
+
+
+void doit(void)
+{
+	int sockets[2];
+	int err;
+
+	signal(SIGPIPE, SIG_IGN);
+
+	err = socketpair(AF_UNIX, SOCK_STREAM, 0, sockets);
+	if (err == -1) {
+		perror("socketpair");
+		fail("socketpair failed\n");
+		return;
+	}
+
+	child = fork();
+	if (child < 0) {
+		perror("fork");
+		fail("fork");
+		return;
+	}
+
+	if (child) {
+		int status;
+
+		client(sockets[1]);
+		wait(&status);
+		check_wait_status(status);
+	} else {
+		server(sockets[0]);
+		_exit(0);
+	}
+}
+
+#endif				/* _WIN32 */
diff --git a/tests/sign-md5-rep.c b/tests/sign-md5-rep.c
deleted file mode 100644
index b14d996d8d..0000000000
--- a/tests/sign-md5-rep.c
+++ /dev/null
@@ -1,334 +0,0 @@
-/*
- * Copyright (C) 2015 Nikos Mavrogiannopoulos
- *
- * 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>
-
-#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 "utils.h"
-
-static void terminate(void);
-
-/* This program tests whether MD5 is rejected by a client as a
- * signature algorithm for the ServerKeyExchange.
- */
-
-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);
-}
-
-static unsigned char server_cert_pem[] =
-    "-----BEGIN CERTIFICATE-----\n"
-    "MIICVjCCAcGgAwIBAgIERiYdMTALBgkqhkiG9w0BAQUwGTEXMBUGA1UEAxMOR251\n"
-    "VExTIHRlc3QgQ0EwHhcNMDcwNDE4MTMyOTIxWhcNMDgwNDE3MTMyOTIxWjA3MRsw\n"
-    "GQYDVQQKExJHbnVUTFMgdGVzdCBzZXJ2ZXIxGDAWBgNVBAMTD3Rlc3QuZ251dGxz\n"
-    "Lm9yZzCBnDALBgkqhkiG9w0BAQEDgYwAMIGIAoGA17pcr6MM8C6pJ1aqU46o63+B\n"
-    "dUxrmL5K6rce+EvDasTaDQC46kwTHzYWk95y78akXrJutsoKiFV1kJbtple8DDt2\n"
-    "DZcevensf9Op7PuFZKBroEjOd35znDET/z3IrqVgbtm2jFqab7a+n2q9p/CgMyf1\n"
-    "tx2S5Zacc1LWn9bIjrECAwEAAaOBkzCBkDAMBgNVHRMBAf8EAjAAMBoGA1UdEQQT\n"
-    "MBGCD3Rlc3QuZ251dGxzLm9yZzATBgNVHSUEDDAKBggrBgEFBQcDATAPBgNVHQ8B\n"
-    "Af8EBQMDB6AAMB0GA1UdDgQWBBTrx0Vu5fglyoyNgw106YbU3VW0dTAfBgNVHSME\n"
-    "GDAWgBTpPBz7rZJu5gakViyi4cBTJ8jylTALBgkqhkiG9w0BAQUDgYEAaFEPTt+7\n"
-    "bzvBuOf7+QmeQcn29kT6Bsyh1RHJXf8KTk5QRfwp6ogbp94JQWcNQ/S7YDFHglD1\n"
-    "AwUNBRXwd3riUsMnsxgeSDxYBfJYbDLeohNBsqaPDJb7XailWbMQKfAbFQ8cnOxg\n"
-    "rOKLUQRWJ0K3HyXRMhbqjdLIaQiCvQLuizo=\n" "-----END CERTIFICATE-----\n";
-
-const gnutls_datum_t server_cert = { server_cert_pem,
-	sizeof(server_cert_pem)
-};
-
-static unsigned char server_key_pem[] =
-    "-----BEGIN RSA PRIVATE KEY-----\n"
-    "MIICXAIBAAKBgQDXulyvowzwLqknVqpTjqjrf4F1TGuYvkrqtx74S8NqxNoNALjq\n"
-    "TBMfNhaT3nLvxqResm62ygqIVXWQlu2mV7wMO3YNlx696ex/06ns+4VkoGugSM53\n"
-    "fnOcMRP/PciupWBu2baMWppvtr6far2n8KAzJ/W3HZLllpxzUtaf1siOsQIDAQAB\n"
-    "AoGAYAFyKkAYC/PYF8e7+X+tsVCHXppp8AoP8TEZuUqOZz/AArVlle/ROrypg5kl\n"
-    "8YunrvUdzH9R/KZ7saNZlAPLjZyFG9beL/am6Ai7q7Ma5HMqjGU8kTEGwD7K+lbG\n"
-    "iomokKMOl+kkbY/2sI5Czmbm+/PqLXOjtVc5RAsdbgvtmvkCQQDdV5QuU8jap8Hs\n"
-    "Eodv/tLJ2z4+SKCV2k/7FXSKWe0vlrq0cl2qZfoTUYRnKRBcWxc9o92DxK44wgPi\n"
-    "oMQS+O7fAkEA+YG+K9e60sj1K4NYbMPAbYILbZxORDecvP8lcphvwkOVUqbmxOGh\n"
-    "XRmTZUuhBrJhJKKf6u7gf3KWlPl6ShKEbwJASC118cF6nurTjuLf7YKARDjNTEws\n"
-    "qZEeQbdWYINAmCMj0RH2P0mvybrsXSOD5UoDAyO7aWuqkHGcCLv6FGG+qwJAOVqq\n"
-    "tXdUucl6GjOKKw5geIvRRrQMhb/m5scb+5iw8A4LEEHPgGiBaF5NtJZLALgWfo5n\n"
-    "hmC8+G8F0F78znQtPwJBANexu+Tg5KfOnzSILJMo3oXiXhf5PqXIDmbN0BKyCKAQ\n"
-    "LfkcEcUbVfmDaHpvzwY9VEaoMOKVLitETXdNSxVpvWM=\n"
-    "-----END RSA PRIVATE KEY-----\n";
-
-const gnutls_datum_t server_key = { server_key_pem,
-	sizeof(server_key_pem)
-};
-
-
-static int handshake_callback(gnutls_session_t session, unsigned int htype,
-	unsigned post, unsigned int incoming, const gnutls_datum_t *msg)
-{
-	gnutls_priority_set_direct(session, "NORMAL:-KX-ALL:+ECDHE-RSA", NULL);
-	return 0;
-}
-	
-
-/* A very basic TLS client, with anonymous authentication.
- */
-
-#define MAX_BUF 1024
-
-static void client(int fd)
-{
-	int ret;
-	char buffer[MAX_BUF + 1];
-	gnutls_certificate_credentials_t x509_cred;
-	gnutls_session_t session;
-	/* Need to enable anonymous KX specifically. */
-
-	global_init();
-
-	if (debug) {
-		gnutls_global_set_log_function(client_log_func);
-		gnutls_global_set_log_level(7);
-	}
-
-	gnutls_certificate_allocate_credentials(&x509_cred);
-
-	/* Initialize TLS session
-	 */
-	gnutls_init(&session, GNUTLS_CLIENT);
-
-	/* Use default priorities */
-	gnutls_priority_set_direct(session, "NORMAL:-KX-ALL:+ECDHE-RSA:-SIGN-ALL:+SIGN-RSA-MD5", NULL);
-
-	/* put the anonymous credentials to the current session
-	 */
-	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
-
-	gnutls_transport_set_int(session, fd);
-	gnutls_handshake_set_hook_function(session, GNUTLS_HANDSHAKE_SERVER_KEY_EXCHANGE,
-					   GNUTLS_HOOK_PRE,
-					   handshake_callback);
-
-	/* Perform the TLS handshake
-	 */
-	do {
-		ret = gnutls_handshake(session);
-	}
-	while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
-
-	if (ret == GNUTLS_E_UNSUPPORTED_SIGNATURE_ALGORITHM) {
-		/* success */
-		goto end;
-	}
-
-	if (ret < 0) {
-		fail("client: Handshake failed: %s\n", gnutls_strerror(ret));
-		terminate();
-	} else {
-		if (debug)
-			success("client: Handshake was completed\n");
-	}
-
-	if (gnutls_sign_algorithm_get(session) == GNUTLS_SIGN_RSA_MD5) {
-		fail("client: MD5 was negotiated\n");
-		terminate();
-	}
-	success("client: %s was negotiated\n", gnutls_sign_get_name(gnutls_sign_algorithm_get(session)));
-
-	if (debug)
-		success("client: TLS version is: %s\n",
-			gnutls_protocol_get_name
-			(gnutls_protocol_get_version(session)));
-
-	do {
-		do {
-			ret = gnutls_record_recv(session, buffer, MAX_BUF);
-		} while (ret == GNUTLS_E_AGAIN
-			 || ret == GNUTLS_E_INTERRUPTED);
-	} while (ret > 0);
-
-	if (ret == 0) {
-		if (debug)
-			success
-			    ("client: Peer has closed the TLS connection\n");
-		goto end;
-	} else if (ret < 0) {
-		fail("client: Error: %s\n", gnutls_strerror(ret));
-		terminate();
-	}
-
-	gnutls_bye(session, GNUTLS_SHUT_WR);
-
-      end:
-
-	close(fd);
-
-	gnutls_deinit(session);
-
-	gnutls_certificate_free_credentials(x509_cred);
-
-	gnutls_global_deinit();
-}
-
-
-/* These are global */
-pid_t child;
-
-static void terminate(void)
-{
-	kill(child, SIGTERM);
-	exit(1);
-}
-
-static void server(int fd)
-{
-	int ret;
-	char buffer[MAX_BUF + 1];
-	gnutls_session_t session;
-	gnutls_certificate_credentials_t x509_cred;
-
-	/* this must be called once in the program
-	 */
-	global_init();
-	memset(buffer, 0, sizeof(buffer));
-
-	if (debug) {
-		gnutls_global_set_log_function(server_log_func);
-		gnutls_global_set_log_level(4711);
-	}
-
-	gnutls_certificate_allocate_credentials(&x509_cred);
-	gnutls_certificate_set_x509_key_mem(x509_cred, &server_cert,
-					    &server_key,
-					    GNUTLS_X509_FMT_PEM);
-
-	gnutls_init(&session, GNUTLS_SERVER);
-
-	/* avoid calling all the priority functions, since the defaults
-	 * are adequate.
-	 */
-	gnutls_priority_set_direct(session, "NORMAL:-KX-ALL:+ECDHE-RSA:-SIGN-ALL:+SIGN-RSA-MD5", NULL);
-
-	gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
-
-	gnutls_transport_set_int(session, fd);
-
-	do {
-		ret = gnutls_handshake(session);
-	} while (ret < 0 && gnutls_error_is_fatal(ret) == 0);
-	if (ret < 0) {
-		/* failure is expected here */
-		goto end;
-	}
-
-	if (debug) {
-		success("server: Handshake was completed\n");
-		success("server: %s was negotiated\n", gnutls_sign_get_name(gnutls_sign_algorithm_get(session)));
-	}
-
-	if (debug)
-		success("server: TLS version is: %s\n",
-			gnutls_protocol_get_name
-			(gnutls_protocol_get_version(session)));
-
-	/* do not wait for the peer to close the connection.
-	 */
-	gnutls_bye(session, GNUTLS_SHUT_WR);
-
- end:
-	close(fd);
-	gnutls_deinit(session);
-
-	gnutls_certificate_free_credentials(x509_cred);
-
-	gnutls_global_deinit();
-
-	if (debug)
-		success("server: finished\n");
-}
-
-static void ch_handler(int sig)
-{
-	int status;
-	wait(&status);
-	check_wait_status(status);
-	return;
-}
-
-void doit(void)
-{
-	int fd[2];
-	int ret;
-
-	signal(SIGCHLD, ch_handler);
-
-	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]);
-		client(fd[0]);
-		kill(child, SIGTERM);
-	} else {
-		close(fd[0]);
-		server(fd[1]);
-		exit(0);
-	}
-}
-
-#endif				/* _WIN32 */