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/*
* Copyright (C) 2021 Red Hat, Inc.
*
* Author: Alexander Sosedkin
*
* 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
*/
#include <errno.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include "utils.h"
/*
* This is not a test by itself.
* This is a helper for the real test in protocol-set-allowlist.sh.
* It executes sequences of commands like:
* > connect -> connection established: (TLS1.2)-(RSA)-(AES-128-GCM)
* > protocol_set_disabled TLS1.2 -> OK
* > connect -> bad priority: (actually, any arrow-less text can go here)
* where `connect` connects to $TEST_SERVER_PORT using $TEST_SERVER_CA,
* and gnutls_protocol_set_enabled simply call the underlying API.
* leaving the outer test to check return code and output:
* connect -> connection established: (TLS1.2)-(RSA)-(AES-128-GCM)
* protocol_set_disabled TLS1.2 -> OK
* connect -> bad priority: No or insufficient priorities were set.
*/
#define _assert(cond, format, ...) if (!(cond)) \
_fail("Assertion `" #cond "` failed: " format "\n", ##__VA_ARGS__)
#define _check(cond) if (!(cond)) _fail("Assertion `" #cond "` failed.")
unsigned parse_port(const char* port_str);
gnutls_protocol_t parse_protocol(const char* name);
void test_echo_server(gnutls_session_t session);
void cmd_connect(const char* ca_file, unsigned port);
void cmd_protocol_set_disabled(const char* name);
void cmd_protocol_set_enabled(const char* name);
const char* unprefix(const char* s, const char* prefix);
unsigned parse_port(const char* port_str)
{
unsigned port;
errno = 0;
port = strtoul(port_str, NULL, 10);
_assert(!errno, "Could not parse port value '%s'\n", port_str);
_assert(0 < port && port < (1UL << 16), "Invalid port %u\n", port);
return port;
}
gnutls_protocol_t parse_protocol(const char* name)
{
gnutls_protocol_t p;
p = gnutls_protocol_get_id(name);
_assert(p != GNUTLS_VERSION_UNKNOWN, "Unknown protocol `%s`", name);
return p;
}
void test_echo_server(gnutls_session_t session)
{
const char buf_out[] = "1234567\n";
char buf_in[sizeof(buf_out) - 1];
unsigned rd = 0, wr = 0;
unsigned LEN = sizeof(buf_out) - 1;
int r;
do {
r = gnutls_record_send(session, buf_out + wr, LEN - wr);
if (r == GNUTLS_E_AGAIN || r == GNUTLS_E_INTERRUPTED)
continue;
_assert(r > 0, "error in send: %s\n", gnutls_strerror(r));
wr += r;
} while(r > 0 && wr < LEN);
_assert(wr == LEN, "error sending all data (%u/%u)\n", wr, LEN);
do {
r = gnutls_record_recv(session, buf_in + rd, LEN - rd);
if (r == GNUTLS_E_AGAIN || r == GNUTLS_E_INTERRUPTED)
continue;
_assert(r > 0, "error in recv: %s\n", gnutls_strerror(r));
rd += r;
} while(r > 0 && rd < LEN);
_assert(rd == LEN, "error receiving all data (%u/%u)\n", rd, LEN);
_assert(!gnutls_record_check_pending(session), "data left unreceived");
_assert(!memcmp(buf_in, buf_out, LEN), "send/recv data mismatch\n");
}
void cmd_connect(const char* ca_file, unsigned port)
{
char* desc;
int sock, r;
gnutls_session_t session;
gnutls_certificate_credentials_t cred;
int sock_flags = 1;
_check(gnutls_init(&session, GNUTLS_CLIENT) >= 0);
r = gnutls_set_default_priority(session);
if (r < 0) {
printf("connect -> bad priority: %s\n", gnutls_strerror(r));
gnutls_deinit(session);
return;
}
_check(gnutls_server_name_set(session, GNUTLS_NAME_DNS,
"example.com", strlen("example.com")) >= 0);
gnutls_session_set_verify_cert(session, "example.com", 0);
_check(gnutls_certificate_allocate_credentials(&cred) >= 0);
_check(gnutls_certificate_set_x509_trust_file(cred,
ca_file, GNUTLS_X509_FMT_PEM) == 1);
_check(gnutls_credentials_set(session,
GNUTLS_CRD_CERTIFICATE, cred) >= 0);
sock = tcp_connect("127.0.0.1", port);
_assert(sock != -1, "Connection to 127.0.0.1:%u has failed!", port);
_assert(setsockopt(sock, IPPROTO_TCP, TCP_NODELAY,
&sock_flags, sizeof(int)) == 0, "setsockopt failed");
gnutls_transport_set_int(session, sock);
gnutls_handshake_set_timeout(session, GNUTLS_DEFAULT_HANDSHAKE_TIMEOUT);
do {
r = gnutls_handshake(session);
} while (r < 0 && !gnutls_error_is_fatal(r));
if (r >= 0) {
desc = gnutls_session_get_desc(session);
_check(desc);
printf("connect -> connection established: %s\n", desc);
gnutls_free(desc);
} else {
printf("connect -> handshake failed: %s\n", gnutls_strerror(r));
}
gnutls_bye(session, GNUTLS_SHUT_RDWR);
shutdown(sock, SHUT_RDWR);
close(sock);
gnutls_certificate_free_credentials(cred);
gnutls_deinit(session);
}
void cmd_protocol_set_disabled(const char* name)
{
_check(gnutls_protocol_set_enabled(parse_protocol(name), 0) >= 0);
printf("protocol_set_disabled %s -> OK\n", name);
}
void cmd_protocol_set_enabled(const char* name)
{
_check(gnutls_protocol_set_enabled(parse_protocol(name), 1) >= 0);
printf("protocol_set_enabled %s -> OK\n", name);
}
// Returns 0 if `s` doesn't start with `prefix`, pointer past prefix otherwise.
const char* unprefix(const char* s, const char* prefix)
{
while (*s && *prefix && *s == *prefix)
s++, prefix++;
return *prefix ? NULL : s;
}
#define MAX_CMD_LEN 127
void doit(void)
{
unsigned port;
const char* port_str;
const char* ca_file;
const char* p;
char cmd_buf[MAX_CMD_LEN + 1];
char* e;
ca_file = getenv("TEST_SERVER_CA");
_assert(ca_file, "TEST_SERVER_CA is not set");
port_str = getenv("TEST_SERVER_PORT");
_assert(port_str, "TEST_SERVER_PORT is not set");
port = parse_port(port_str);
_check(gnutls_global_init() >= 0);
while (!feof(stdin)) {
memset(cmd_buf, '\0', MAX_CMD_LEN + 1);
fgets(cmd_buf, MAX_CMD_LEN, stdin);
e = strchr(cmd_buf, '\n');
if (e)
*e = '\0';
if (!*cmd_buf)
continue;
else if (!strcmp(cmd_buf, "> connect"))
cmd_connect(ca_file, port);
else if ((p = unprefix(cmd_buf, "> protocol_set_disabled ")))
cmd_protocol_set_disabled(p);
else if ((p = unprefix(cmd_buf, "> protocol_set_enabled ")))
cmd_protocol_set_enabled(p);
else if ((p = unprefix(cmd_buf, "> ")))
_fail("Unknown command `%s`\n", p);
else
_fail("Invalid line `%s`, does not start with `> `\n",
cmd_buf);
}
gnutls_global_deinit();
exit(0);
}
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