/*

 * 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 <https://www.gnu.org/licenses/>

 */

/* This tests TLS negotiation using the gnutls_privkey_import_ext2() APIs */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/types.h>

#ifndef _WIN32

# include <netinet/in.h>

# include <sys/socket.h>

# include <arpa/inet.h>

#endif

#include <unistd.h>

#include <gnutls/gnutls.h>

#include <gnutls/x509.h>

#include <gnutls/abstract.h>

#include <assert.h>

#include "cert-common.h"

#include "eagain-common.h"

#include "utils.h"

static void tls_log_func(int level, const char *str)

{

	fprintf(stderr, "<%d> %s", level, str);

}

const gnutls_datum_t raw_data = {

	(void *) "hello",

	5

};

struct key_cb_data {

	gnutls_privkey_t rkey; /* the real thing */

	unsigned pk;

	unsigned sig;

	unsigned bits;

};

static int key_cb_info_func(gnutls_privkey_t key, unsigned int flags, void *userdata)

{

	struct key_cb_data *p = userdata;

	if (flags & GNUTLS_PRIVKEY_INFO_PK_ALGO)

		return p->pk;

	else if (flags & GNUTLS_PRIVKEY_INFO_PK_ALGO_BITS)

		return p->bits;

	else if (flags & GNUTLS_PRIVKEY_INFO_HAVE_SIGN_ALGO) {

		unsigned sig = GNUTLS_FLAGS_TO_SIGN_ALGO(flags);

		if (sig == p->sig)

			return 1;

		return 0;

	}

	return -1;

}

static

int key_cb_sign_data_func(gnutls_privkey_t key, gnutls_sign_algorithm_t sig,

			  void* userdata, unsigned int flags, const gnutls_datum_t *data,

			  gnutls_datum_t *signature)

{

	struct key_cb_data *p = userdata;

	if (debug)

		fprintf(stderr, "signing data with: %s\n", gnutls_sign_get_name(sig));

	return gnutls_privkey_sign_data2(p->rkey, sig, 0, data, signature);

}

static

int key_cb_sign_hash_func(gnutls_privkey_t key, gnutls_sign_algorithm_t sig,

			  void* userdata, unsigned int flags, const gnutls_datum_t *data,

			  gnutls_datum_t *signature)

{

	struct key_cb_data *p = userdata;

	if (sig == GNUTLS_SIGN_RSA_RAW) {

		if (debug)

			fprintf(stderr, "signing digestinfo with: raw RSA\n");

		return gnutls_privkey_sign_hash(p->rkey, 0, GNUTLS_PRIVKEY_SIGN_FLAG_TLS1_RSA, data, signature);

	} else {

		if (debug)

			fprintf(stderr, "signing hash with: %s\n", gnutls_sign_get_name(sig));

		return gnutls_privkey_sign_hash2(p->rkey, sig, 0, data, signature);

	}

}

static

int key_cb_decrypt_func(gnutls_privkey_t key, void *userdata, const gnutls_datum_t *ciphertext,

			gnutls_datum_t *plaintext)

{

	struct key_cb_data *p = userdata;

	return gnutls_privkey_decrypt_data(p->rkey, 0, ciphertext, plaintext);

}

static void key_cb_deinit_func(gnutls_privkey_t key, void* userdata)

{

	struct key_cb_data *p = userdata;

	gnutls_privkey_deinit(p->rkey);

	free(userdata);

}

#define testfail(fmt, ...) \

	fail("%s: "fmt, name, ##__VA_ARGS__)

static gnutls_privkey_t load_virt_privkey(const char *name, const gnutls_datum_t *txtkey,

					  gnutls_pk_algorithm_t pk, gnutls_sign_algorithm_t sig,

					  int exp_ret)

{

	gnutls_privkey_t privkey;

	struct key_cb_data *userdata;

	int ret;

	userdata = calloc(1, sizeof(struct key_cb_data));

	if (userdata == NULL) {

		testfail("memory error\n");

	}

	ret = gnutls_privkey_init(&privkey);

	if (ret < 0)

		testfail("gnutls_privkey_init\n");

	ret = gnutls_privkey_init(&userdata->rkey);

	if (ret < 0)

		testfail("gnutls_privkey_init\n");

	ret =

	    gnutls_privkey_import_x509_raw(userdata->rkey, txtkey, GNUTLS_X509_FMT_PEM, NULL, 0);

	if (ret < 0)

		testfail("gnutls_privkey_import\n");

	gnutls_privkey_get_pk_algorithm(userdata->rkey, &userdata->bits);

	userdata->pk = pk;

	userdata->sig = sig;

	ret = gnutls_privkey_import_ext4(privkey, userdata, key_cb_sign_data_func,

					 key_cb_sign_hash_func, key_cb_decrypt_func,

					 key_cb_deinit_func, key_cb_info_func,

					 GNUTLS_PRIVKEY_IMPORT_AUTO_RELEASE);

	if (ret < 0) {

		if (ret == exp_ret) {

			gnutls_privkey_deinit(userdata->rkey);

			gnutls_privkey_deinit(privkey);

			free(userdata);

			return NULL;

		}

		testfail("gnutls_privkey_import_ext2: %s\n", gnutls_strerror(ret));

	}

	return privkey;

}

static

void try_with_key(const char *name, const char *client_prio,

		 gnutls_kx_algorithm_t client_kx,

		 gnutls_sign_algorithm_t server_sign_algo,

		 gnutls_sign_algorithm_t client_sign_algo,

		 const gnutls_datum_t *serv_cert,

		 gnutls_privkey_t key,

		 int exp_serv_err)

{

	int ret;

	gnutls_pcert_st pcert_list[4];

	unsigned pcert_list_size;

	/* Server stuff. */

	gnutls_certificate_credentials_t s_xcred;

	gnutls_session_t server;

	int sret = GNUTLS_E_AGAIN;

	/* Client stuff. */

	gnutls_certificate_credentials_t c_xcred;

	gnutls_session_t client;

	int cret = GNUTLS_E_AGAIN, version;

	const char *err;

	/* General init. */

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(6);

	reset_buffers();

	/* Init server */

	gnutls_certificate_allocate_credentials(&s_xcred);

	pcert_list_size = sizeof(pcert_list)/sizeof(pcert_list[0]);

	ret = gnutls_pcert_list_import_x509_raw(pcert_list, &pcert_list_size,

		serv_cert, GNUTLS_X509_FMT_PEM, 0);

	if (ret < 0) {

		testfail("error in gnutls_pcert_list_import_x509_raw: %s\n", gnutls_strerror(ret));

	}

	ret = gnutls_certificate_set_key(s_xcred, NULL, 0, pcert_list,

				pcert_list_size, key);

	if (ret < 0) {

		testfail("Could not set key/cert: %s\n", gnutls_strerror(ret));

	}

	gnutls_init(&server, GNUTLS_SERVER);

	gnutls_credentials_set(server, GNUTLS_CRD_CERTIFICATE,

				s_xcred);

	assert(gnutls_priority_set_direct(server, "NORMAL", NULL)>=0);

	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_certificate_allocate_credentials(&c_xcred);

	if (ret < 0)

		exit(1);

#if 0

	ret = gnutls_certificate_set_x509_trust_mem(c_xcred, &ca_cert, GNUTLS_X509_FMT_PEM);

	if (ret < 0)

		exit(1);

#endif

	ret = gnutls_init(&client, GNUTLS_CLIENT);

	if (ret < 0)

		exit(1);

	ret = gnutls_credentials_set(client, GNUTLS_CRD_CERTIFICATE,

				c_xcred);

	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);

	ret = gnutls_priority_set_direct(client, client_prio, &err;;

	if (ret < 0) {

		if (ret == GNUTLS_E_INVALID_REQUEST)

			fprintf(stderr, "Error in %s\n", err);

		exit(1);

	}

	if (exp_serv_err) {

		HANDSHAKE_EXPECT(client, server, GNUTLS_E_AGAIN, exp_serv_err);

		goto cleanup;

	} else {

		HANDSHAKE(client, server);

	}

	if (gnutls_kx_get(client) != client_kx) {

		testfail("got unexpected key exchange algorithm: %s (expected %s)\n", gnutls_kx_get_name(gnutls_kx_get(client)),

			gnutls_kx_get_name(client_kx));

		exit(1);

	}

	/* test signature algorithm match */

	version = gnutls_protocol_get_version(client);

	if (version >= GNUTLS_TLS1_2) {

		ret = gnutls_sign_algorithm_get(server);

		if (ret != (int)server_sign_algo && server_sign_algo != 0) {

			testfail("got unexpected server signature algorithm: %d/%s\n", ret, gnutls_sign_get_name(ret));

			exit(1);

		}

		ret = gnutls_sign_algorithm_get_client(server);

		if (ret != (int)client_sign_algo && client_sign_algo != 0) {

			testfail("got unexpected client signature algorithm: %d/%s\n", ret, gnutls_sign_get_name(ret));

			exit(1);

		}

		ret = gnutls_sign_algorithm_get(client);

		if (ret != (int)server_sign_algo && server_sign_algo != 0) {

			testfail("cl: got unexpected server signature algorithm: %d/%s\n", ret, gnutls_sign_get_name(ret));

			exit(1);

		}

		ret = gnutls_sign_algorithm_get_client(client);

		if (ret != (int)client_sign_algo && client_sign_algo != 0) {

			testfail("cl: got unexpected client signature algorithm: %d/%s\n", ret, gnutls_sign_get_name(ret));

			exit(1);

		}

	}

	gnutls_bye(client, GNUTLS_SHUT_RDWR);

	gnutls_bye(server, GNUTLS_SHUT_RDWR);

 cleanup:

	gnutls_deinit(client);

	gnutls_deinit(server);

	gnutls_certificate_free_credentials(s_xcred);

	gnutls_certificate_free_credentials(c_xcred);

}

typedef struct test_st {

	const char *name;

	gnutls_pk_algorithm_t pk;

	const char *prio;

	const gnutls_datum_t *cert;

	const gnutls_datum_t *key;

	gnutls_kx_algorithm_t exp_kx;

	unsigned sig;

	int exp_key_err;

	int exp_serv_err;

} test_st;

static const test_st tests[] = {

	{.name = "tls1.2 ecc key",

	 .pk = GNUTLS_PK_ECDSA,

	 .prio = "NORMAL:-KX-ALL:+ECDHE-RSA:+ECDHE-ECDSA:-VERS-ALL:+VERS-TLS1.2",

	 .cert = &server_ca3_localhost_ecc_cert,

	 .key = &server_ca3_ecc_key,

	 .sig = GNUTLS_SIGN_ECDSA_SHA256,

	 .exp_kx = GNUTLS_KX_ECDHE_ECDSA

	},

	{.name = "tls1.0 ecc key",

	 .pk = GNUTLS_PK_ECDSA,

	 .prio = "NORMAL:-KX-ALL:+ECDHE-RSA:+ECDHE-ECDSA:-VERS-ALL:+VERS-TLS1.0",

	 .cert = &server_ca3_localhost_ecc_cert,

	 .key = &server_ca3_ecc_key,

	 .sig = GNUTLS_SIGN_ECDSA_SHA256,

	 .exp_kx = GNUTLS_KX_ECDHE_ECDSA

	},

	{.name = "tls1.1 ecc key",

	 .pk = GNUTLS_PK_ECDSA,

	 .prio = "NORMAL:-KX-ALL:+ECDHE-RSA:+ECDHE-ECDSA:-VERS-ALL:+VERS-TLS1.1",

	 .cert = &server_ca3_localhost_ecc_cert,

	 .key = &server_ca3_ecc_key,

	 .sig = GNUTLS_SIGN_ECDSA_SHA256,

	 .exp_kx = GNUTLS_KX_ECDHE_ECDSA

	},

	{.name = "tls1.2 rsa-sign key",

	 .pk = GNUTLS_PK_RSA,

	 .prio = "NORMAL:+ECDHE-RSA:+ECDHE-ECDSA:-VERS-ALL:+VERS-TLS1.2",

	 .cert = &server_ca3_localhost_cert,

	 .key = &server_ca3_key,

	 .sig = GNUTLS_SIGN_RSA_SHA256,

	 .exp_kx = GNUTLS_KX_ECDHE_RSA

	},

	{.name = "tls1.0 rsa-sign key",

	 .pk = GNUTLS_PK_RSA,

	 .prio = "NORMAL:+ECDHE-RSA:+ECDHE-ECDSA:-VERS-ALL:+VERS-TLS1.0",

	 .cert = &server_ca3_localhost_cert,

	 .key = &server_ca3_key,

	 .sig = GNUTLS_SIGN_RSA_SHA256,

	 .exp_kx = GNUTLS_KX_ECDHE_RSA

	},

	{.name = "tls1.0 rsa-decrypt key",

	 .pk = GNUTLS_PK_RSA,

	 .prio = "NORMAL:-KX-ALL:+RSA:-VERS-ALL:+VERS-TLS1.0",

	 .cert = &server_ca3_localhost_cert,

	 .key = &server_ca3_key,

	 .exp_kx = GNUTLS_KX_RSA

	},

	{.name = "tls1.1 rsa-sign key",

	 .pk = GNUTLS_PK_RSA,

	 .prio = "NORMAL:+ECDHE-RSA:+ECDHE-ECDSA:-VERS-ALL:+VERS-TLS1.1",

	 .cert = &server_ca3_localhost_cert,

	 .key = &server_ca3_key,

	 .sig = GNUTLS_SIGN_RSA_SHA256,

	 .exp_kx = GNUTLS_KX_ECDHE_RSA

	},

	{.name = "tls1.2 rsa-sign key with rsa-pss sigs prioritized",

	 .pk = GNUTLS_PK_RSA,

	 .prio = "NORMAL:+ECDHE-RSA:+ECDHE-ECDSA:-SIGN-ALL:+SIGN-RSA-PSS-SHA256:+SIGN-RSA-PSS-SHA384:+SIGN-RSA-PSS-SHA512:+SIGN-RSA-SHA256:+SIGN-RSA-SHA384:+SIGN-RSA-SHA512:-VERS-ALL:+VERS-TLS1.2",

	 .cert = &server_ca3_localhost_cert,

	 .key = &server_ca3_key,

	 .sig = GNUTLS_SIGN_RSA_SHA256,

	 .exp_kx = GNUTLS_KX_ECDHE_RSA

	},

	{.name = "tls1.2 rsa-pss-sign key",

	 .pk = GNUTLS_PK_RSA_PSS,

	 .prio = "NORMAL:+ECDHE-RSA:+ECDHE-ECDSA:-VERS-ALL:+VERS-TLS1.2",

	 .cert = &server_ca3_rsa_pss2_cert,

	 .key = &server_ca3_rsa_pss2_key,

	 .sig = GNUTLS_SIGN_RSA_PSS_SHA256,

	 .exp_kx = GNUTLS_KX_ECDHE_RSA,

	},

	{.name = "tls1.2 rsa-pss cert, rsa-sign key", /* we expect the server to refuse negotiating */

	 .pk = GNUTLS_PK_RSA,

	 .prio = "NORMAL:+ECDHE-RSA:+ECDHE-ECDSA:-VERS-ALL:+VERS-TLS1.2",

	 .cert = &server_ca3_rsa_pss_cert,

	 .key = &server_ca3_rsa_pss_key,

	 .exp_kx = GNUTLS_KX_ECDHE_RSA,

	 .exp_serv_err = GNUTLS_E_NO_CIPHER_SUITES

	},

	{.name = "tls1.2 ed25519 cert, ed25519 key",

	 .pk = GNUTLS_PK_EDDSA_ED25519,

	 .prio = "NORMAL:+ECDHE-RSA:+ECDHE-ECDSA:-VERS-ALL:+VERS-TLS1.2",

	 .cert = &server_ca3_eddsa_cert,

	 .key = &server_ca3_eddsa_key,

	 .sig = GNUTLS_SIGN_EDDSA_ED25519,

	 .exp_kx = GNUTLS_KX_ECDHE_ECDSA,

	},

	{.name = "tls1.2 rsa-decrypt key",

	 .pk = GNUTLS_PK_RSA,

	 .prio = "NORMAL:-KX-ALL:+RSA:-VERS-ALL:+VERS-TLS1.2",

	 .cert = &server_ca3_localhost_cert,

	 .key = &server_ca3_key,

	 .exp_kx = GNUTLS_KX_RSA

	},

	{.name = "tls1.3 ecc key",

	 .pk = GNUTLS_PK_ECDSA,

	 .prio = "NORMAL:-VERS-ALL:+VERS-TLS1.3",

	 .cert = &server_ca3_localhost_ecc_cert,

	 .key = &server_ca3_ecc_key,

	 .sig = GNUTLS_SIGN_ECDSA_SECP256R1_SHA256,

	 .exp_kx = GNUTLS_KX_ECDHE_RSA

	},

	{.name = "tls1.3 rsa-sign key",

	 .pk = GNUTLS_PK_RSA,

	 .prio = "NORMAL:-VERS-ALL:+VERS-TLS1.3",

	 .cert = &server_ca3_localhost_cert,

	 .key = &server_ca3_key,

	 .sig = GNUTLS_SIGN_RSA_PSS_RSAE_SHA256,

	 .exp_kx = GNUTLS_KX_ECDHE_RSA

	},

	{.name = "tls1.3 rsa-pss-sign key",

	 .pk = GNUTLS_PK_RSA_PSS,

	 .prio = "NORMAL:-VERS-ALL:+VERS-TLS1.3",

	 .cert = &server_ca3_rsa_pss2_cert,

	 .key = &server_ca3_rsa_pss2_key,

	 .sig = GNUTLS_SIGN_RSA_PSS_SHA256,

	 .exp_kx = GNUTLS_KX_ECDHE_RSA,

	},

	{.name = "tls1.3 rsa-pss cert, rsa-sign key", /* we expect the server to attempt to downgrade to TLS 1.2, but it is not possible because it is not enabled */

	 .pk = GNUTLS_PK_RSA,

	 .prio = "NORMAL:-VERS-ALL:+VERS-TLS1.3",

	 .cert = &server_ca3_rsa_pss_cert,

	 .key = &server_ca3_rsa_pss_key,

	 .sig = GNUTLS_SIGN_RSA_SHA256,

	 .exp_kx = GNUTLS_KX_ECDHE_RSA,

	 .exp_serv_err = GNUTLS_E_NO_CIPHER_SUITES

	},

	{.name = "tls1.3 rsa-pss cert, rsa-sign key, downgrade to tls1.2", /* we expect the server to downgrade to TLS 1.2 and refuse negotiating */

	 .pk = GNUTLS_PK_RSA,

	 .prio = "NORMAL:-VERS-ALL:+VERS-TLS1.3:+VERS-TLS1.2",

	 .cert = &server_ca3_rsa_pss_cert,

	 .key = &server_ca3_rsa_pss_key,

	 .sig = GNUTLS_SIGN_RSA_SHA256,

	 .exp_kx = GNUTLS_KX_ECDHE_RSA,

	 .exp_serv_err = GNUTLS_E_NO_CIPHER_SUITES

	},

	{.name = "tls1.3 ed25519 cert, ed25519 key",

	 .pk = GNUTLS_PK_EDDSA_ED25519,

	 .prio = "NORMAL:-VERS-ALL:+VERS-TLS1.3",

	 .cert = &server_ca3_eddsa_cert,

	 .key = &server_ca3_eddsa_key,

	 .sig = GNUTLS_SIGN_EDDSA_ED25519,

	 .exp_kx = GNUTLS_KX_ECDHE_RSA,

	}

};

void doit(void)

{

	gnutls_privkey_t privkey;

	unsigned int i;

	global_init();

	gnutls_global_set_log_function(tls_log_func);

	if (debug)

		gnutls_global_set_log_level(6);

	for (i=0;i

		success("checking: %s\n", tests[i].name);

		privkey = load_virt_privkey(tests[i].name, tests[i].key, tests[i].pk,

					    tests[i].sig,

					    tests[i].exp_key_err);

		if (privkey == NULL && tests[i].exp_key_err < 0)

			continue;

		assert(privkey != 0);

		try_with_key(tests[i].name, tests[i].prio,

			     tests[i].exp_kx, 0, 0,

			     tests[i].cert, privkey,

			     tests[i].exp_serv_err);

	}

	gnutls_global_deinit();

}