/*

 * This file is part of the SSH Library

 *

 * Copyright (c) 2010 by Aris Adamantiadis

 *

 * The SSH Library is free software; you can redistribute it and/or modify

 * it under the terms of the GNU Lesser General Public License as published by

 * the Free Software Foundation; either version 2.1 of the License, or (at your

 * option) any later version.

 *

 * The SSH Library 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 Lesser General Public

 * License for more details.

 *

 * You should have received a copy of the GNU Lesser General Public License

 * along with the SSH Library; see the file COPYING.  If not, write to

 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,

 * MA 02111-1307, USA.

 */

#include "config.h"

#define LIBSSH_STATIC

#include "torture.h"

#include "torture_key.h"

#include <sys/types.h>

#include <pwd.h>

#include <errno.h>

#include "session.c"

#include "known_hosts.c"

#define TORTURE_KNOWN_HOSTS_FILE "libssh_torture_knownhosts"

#define BADRSA "AAAAB3NzaC1yc2EAAAADAQABAAABAQChm5" \

               "a6Av65O8cKtx5YXOnui3wJnYE6A6J/I4kZSAibbn14Jcl+34VJQwv96f25AxNmo" \

               "NwoiZV93IzdypQmiuieh6s6wB9WhYjU9K/6CkIpNhpCxswA90b3ePjS7LnR9B9J" \

               "slPSbG1H0KC1c5lb7G3utXteXtM+4YvCvpN5VdC4CpghT+p0cwN2Na8Md5vRItz" \

               "YgIytryNn7LLiwYfoSxvWigFrTTZsrVtCOYyNgklmffpGdzuC43wdANvTewfI9G" \

               "o71r8EXmEc228CrYPmb8Scv3mpXFK/BosohSGkPlEHu9lf3YjnknBicDaVtJOYp" \

               "wnXJPjZo2EhG79HxDRpjJHH"

#define BADED25519 "AAAAC3NzaC1lZDI1NTE5AAAAIE74wHmKKkrxpW/dZ69pKPlMoWG9VvWfrNnUkWRQqaDa"

static int sshd_setup(void **state)

{

    torture_setup_sshd_server(state, false);

    return 0;

}

static int sshd_teardown(void **state) {

    torture_teardown_sshd_server(state);

    return 0;

}

static int session_setup(void **state)

{

    struct torture_state *s = *state;

    int verbosity = torture_libssh_verbosity();

    struct passwd *pwd;

    int rc;

    pwd = getpwnam("bob");

    assert_non_null(pwd);

    rc = setuid(pwd->pw_uid);

    assert_return_code(rc, errno);

    s->ssh.session = ssh_new();

    assert_non_null(s->ssh.session);

    ssh_options_set(s->ssh.session, SSH_OPTIONS_LOG_VERBOSITY, &verbosity);

    ssh_options_set(s->ssh.session, SSH_OPTIONS_HOST, TORTURE_SSH_SERVER);

    ssh_options_set(s->ssh.session, SSH_OPTIONS_USER, TORTURE_SSH_USER_ALICE);

    return 0;

}

static int session_teardown(void **state)

{

    struct torture_state *s = *state;

    char known_hosts_file[1024];

    snprintf(known_hosts_file,

             sizeof(known_hosts_file),

             "%s/%s",

             s->socket_dir,

             TORTURE_KNOWN_HOSTS_FILE);

    ssh_disconnect(s->ssh.session);

    ssh_free(s->ssh.session);

    unlink(known_hosts_file);

    return 0;

}

static void torture_knownhosts_port(void **state) {

    struct torture_state *s = *state;

    ssh_session session = s->ssh.session;

    char known_hosts_file[1024];

    char buffer[200];

    char *p;

    FILE *file;

    int rc;

    snprintf(known_hosts_file,

             sizeof(known_hosts_file),

             "%s/%s",

             s->socket_dir,

             TORTURE_KNOWN_HOSTS_FILE);

    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, known_hosts_file);

    assert_ssh_return_code(session, rc);

    rc = ssh_connect(session);

    assert_ssh_return_code(session, rc);

    session->opts.port = 1234;

    rc = ssh_write_knownhost(session);

    assert_ssh_return_code(session, rc);

    file = fopen(known_hosts_file, "r");

    assert_non_null(file);

    p = fgets(buffer, sizeof(buffer), file);

    assert_non_null(p);

    fclose(file);

    buffer[sizeof(buffer) - 1] = '\0';

    assert_non_null(strstr(buffer,"[127.0.0.10]:1234 "));

    ssh_disconnect(session);

    ssh_free(session);

    /* Now, connect back to the ssh server and verify the known host line */

    s->ssh.session = session = ssh_new();

    ssh_options_set(session, SSH_OPTIONS_HOST, TORTURE_SSH_SERVER);

    ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, known_hosts_file);

    rc = ssh_connect(session);

    assert_ssh_return_code(session, rc);

    session->opts.port = 1234;

    rc = ssh_is_server_known(session);

    assert_int_equal(rc, SSH_SERVER_KNOWN_OK);

}

static void torture_knownhosts_wildcard(void **state)

{

    struct torture_state *s = *state;

    ssh_session session = s->ssh.session;

    char known_hosts_file[1024];

    const char *key = NULL;

    FILE *file;

    int rc;

    snprintf(known_hosts_file,

             sizeof(known_hosts_file),

             "%s/%s",

             s->socket_dir,

             TORTURE_KNOWN_HOSTS_FILE);

    file = fopen(known_hosts_file, "w");

    assert_non_null(file);

    key = torture_get_testkey_pub(SSH_KEYTYPE_RSA);

    fprintf(file, "[127.0.0.10]:* %s\n", key);

    fclose(file);

    rc = ssh_options_set(session, SSH_OPTIONS_HOST, TORTURE_SSH_SERVER);

    assert_ssh_return_code(session, rc);

    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, known_hosts_file);

    assert_ssh_return_code(session, rc);

    rc = ssh_connect(session);

    assert_ssh_return_code(session, rc);

    rc = ssh_is_server_known(session);

    assert_int_equal(rc, SSH_SERVER_KNOWN_OK);

}

static void torture_knownhosts_standard_port(void **state)

{

    struct torture_state *s = *state;

    ssh_session session = s->ssh.session;

    char known_hosts_file[1024];

    const char *key = NULL;

    FILE *file;

    int rc;

    snprintf(known_hosts_file,

             sizeof(known_hosts_file),

             "%s/%s",

             s->socket_dir,

             TORTURE_KNOWN_HOSTS_FILE);

    file = fopen(known_hosts_file, "w");

    assert_non_null(file);

    key = torture_get_testkey_pub(SSH_KEYTYPE_RSA);

    fprintf(file, "[127.0.0.10]:22 %s\n", key);

    fclose(file);

    rc = ssh_options_set(session, SSH_OPTIONS_HOST, TORTURE_SSH_SERVER);

    assert_ssh_return_code(session, rc);

    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, known_hosts_file);

    assert_ssh_return_code(session, rc);

    rc = ssh_connect(session);

    assert_ssh_return_code(session, rc);

    rc = ssh_is_server_known(session);

    assert_int_equal(rc, SSH_SERVER_KNOWN_OK);

}

static void torture_knownhosts_fail(void **state) {

    struct torture_state *s = *state;

    ssh_session session = s->ssh.session;

    char known_hosts_file[1024];

    FILE *file;

    int rc;

    snprintf(known_hosts_file,

             sizeof(known_hosts_file),

             "%s/%s",

             s->socket_dir,

             TORTURE_KNOWN_HOSTS_FILE);

    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, known_hosts_file);

    assert_ssh_return_code(session, rc);

    rc = ssh_options_set(session, SSH_OPTIONS_HOSTKEYS, "rsa-sha2-256");

    assert_ssh_return_code(session, rc);

    file = fopen(known_hosts_file, "w");

    assert_non_null(file);

    fprintf(file, "127.0.0.10 ssh-rsa %s\n", BADRSA);

    fclose(file);

    rc = ssh_connect(session);

    assert_ssh_return_code(session, rc);

    rc = ssh_is_server_known(session);

    assert_int_equal(rc, SSH_SERVER_KNOWN_CHANGED);

}

static void torture_knownhosts_other(void **state) {

    struct torture_state *s = *state;

    ssh_session session = s->ssh.session;

    char known_hosts_file[1024];

    FILE *file;

    int rc;

    snprintf(known_hosts_file,

             sizeof(known_hosts_file),

             "%s/%s",

             s->socket_dir,

             TORTURE_KNOWN_HOSTS_FILE);

    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, known_hosts_file);

    assert_ssh_return_code(session, rc);

    rc = ssh_options_set(session, SSH_OPTIONS_HOSTKEYS, "ecdsa-sha2-nistp521");

    assert_ssh_return_code(session, rc);

    file = fopen(known_hosts_file, "w");

    assert_non_null(file);

    fprintf(file, "127.0.0.10 ssh-rsa %s\n", BADRSA);

    fclose(file);

    rc = ssh_connect(session);

    assert_ssh_return_code(session, rc);

    rc = ssh_is_server_known(session);

    assert_int_equal(rc, SSH_SERVER_FOUND_OTHER);

}

static void torture_knownhosts_other_auto(void **state) {

    struct torture_state *s = *state;

    ssh_session session = s->ssh.session;

    char known_hosts_file[1024];

    int rc;

    snprintf(known_hosts_file,

             sizeof(known_hosts_file),

             "%s/%s",

             s->socket_dir,

             TORTURE_KNOWN_HOSTS_FILE);

    rc = ssh_options_set(session, SSH_OPTIONS_HOST, TORTURE_SSH_SERVER);

    assert_ssh_return_code(session, rc);

    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, known_hosts_file);

    assert_ssh_return_code(session, rc);

    rc = ssh_options_set(session, SSH_OPTIONS_HOSTKEYS, "ecdsa-sha2-nistp521");

    assert_ssh_return_code(session, rc);

    rc = ssh_connect(session);

    assert_ssh_return_code(session, rc);

    rc = ssh_is_server_known(session);

    assert_int_equal(rc, SSH_SERVER_NOT_KNOWN);

    rc = ssh_write_knownhost(session);

    assert_ssh_return_code(session, rc);

    ssh_disconnect(session);

    ssh_free(session);

    /* connect again and check host key */

    session = ssh_new();

    assert_non_null(session);

    s->ssh.session = session;

    rc = ssh_options_set(session, SSH_OPTIONS_HOST, TORTURE_SSH_SERVER);

    assert_ssh_return_code(session, rc);

    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, known_hosts_file);

    assert_ssh_return_code(session, rc);

    rc = ssh_connect(session);

    assert_ssh_return_code(session, rc);

    /* ssh-rsa is the default but libssh should try ssh-ed25519 instead */

    rc = ssh_is_server_known(session);

    assert_int_equal(rc, SSH_SERVER_KNOWN_OK);

    /* session will be freed by session_teardown() */

}

static void torture_knownhosts_conflict(void **state) {

    struct torture_state *s = *state;

    ssh_session session = s->ssh.session;

    char known_hosts_file[1024];

    FILE *file;

    int rc;

    snprintf(known_hosts_file,

             sizeof(known_hosts_file),

             "%s/%s",

             s->socket_dir,

             TORTURE_KNOWN_HOSTS_FILE);

    rc = ssh_options_set(session, SSH_OPTIONS_HOST, TORTURE_SSH_SERVER);

    assert_ssh_return_code(session, rc);

    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, known_hosts_file);

    assert_ssh_return_code(session, rc);

    rc = ssh_options_set(session, SSH_OPTIONS_HOSTKEYS, "rsa-sha2-256");

    assert_ssh_return_code(session, rc);

    file = fopen(known_hosts_file, "w");

    assert_non_null(file);

    fprintf(file, "127.0.0.10 ssh-rsa %s\n", BADRSA);

    fprintf(file, "127.0.0.10 ssh-ed25519 %s\n", BADED25519);

    fclose(file);

    rc = ssh_connect(session);

    assert_ssh_return_code(session, rc);

    rc = ssh_is_server_known(session);

    assert_int_equal(rc, SSH_SERVER_KNOWN_CHANGED);

    rc = ssh_write_knownhost(session);

    assert_ssh_return_code(session, rc);

    ssh_disconnect(session);

    ssh_free(session);

    /* connect again and check host key */

    session = ssh_new();

    assert_non_null(session);

    s->ssh.session = session;

    ssh_options_set(session, SSH_OPTIONS_HOST, TORTURE_SSH_SERVER);

    ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, known_hosts_file);

    rc = ssh_options_set(session, SSH_OPTIONS_HOSTKEYS, "rsa-sha2-256");

    assert_ssh_return_code(session, rc);

    rc = ssh_connect(session);

    assert_ssh_return_code(session, rc);

    rc = ssh_is_server_known(session);

    assert_int_equal(rc, SSH_SERVER_KNOWN_OK);

    /* session will be freed by session_teardown() */

}

static void torture_knownhosts_no_hostkeychecking(void **state)

{

    struct torture_state *s = *state;

    ssh_session session = s->ssh.session;

    char known_hosts_file[1024] = {0};

    enum ssh_known_hosts_e found;

    int strict_host_key_checking = 0;

    int rc;

    snprintf(known_hosts_file,

             sizeof(known_hosts_file),

             "%s/%s",

             s->socket_dir,

             TORTURE_KNOWN_HOSTS_FILE);

    rc = ssh_options_set(session, SSH_OPTIONS_KNOWNHOSTS, known_hosts_file);

    assert_ssh_return_code(session, rc);

    rc = ssh_options_set(session, SSH_OPTIONS_HOSTKEYS, "ecdsa-sha2-nistp521");

    assert_ssh_return_code(session, rc);

    rc = ssh_connect(session);

    assert_ssh_return_code(session, rc);

    found = ssh_session_is_known_server(session);

    assert_int_equal(found, SSH_KNOWN_HOSTS_UNKNOWN);

    rc = ssh_options_set(session, SSH_OPTIONS_STRICTHOSTKEYCHECK, &strict_host_key_checking);

    assert_ssh_return_code(session, rc);

    found = ssh_session_is_known_server(session);

    assert_int_equal(found, SSH_KNOWN_HOSTS_OK);

}

int torture_run_tests(void) {

    int rc;

    struct CMUnitTest tests[] = {

        cmocka_unit_test_setup_teardown(torture_knownhosts_wildcard,

                                        session_setup,

                                        session_teardown),

        cmocka_unit_test_setup_teardown(torture_knownhosts_standard_port,

                                        session_setup,

                                        session_teardown),

        cmocka_unit_test_setup_teardown(torture_knownhosts_port,

                                        session_setup,

                                        session_teardown),

        cmocka_unit_test_setup_teardown(torture_knownhosts_fail,

                                        session_setup,

                                        session_teardown),

        cmocka_unit_test_setup_teardown(torture_knownhosts_other,

                                        session_setup,

                                        session_teardown),

        cmocka_unit_test_setup_teardown(torture_knownhosts_other_auto,

                                        session_setup,

                                        session_teardown),

        cmocka_unit_test_setup_teardown(torture_knownhosts_conflict,

                                        session_setup,

                                        session_teardown),

        cmocka_unit_test_setup_teardown(torture_knownhosts_no_hostkeychecking,

                                        session_setup,

                                        session_teardown),

    };

    ssh_init();

    torture_filter_tests(tests);

    rc = cmocka_run_group_tests(tests, sshd_setup, sshd_teardown);

    ssh_finalize();

    return rc;

}