2016-03-01 13:13:41 +00:00
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/* ssh-base.c
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* ssh-base has base utility functions to connect to hosts via ssh
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*
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* Copyright 2016, Dario Lombardo
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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2018-02-07 11:26:45 +00:00
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* SPDX-License-Identifier: GPL-2.0-or-later
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2016-03-01 13:13:41 +00:00
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*/
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2015-11-24 22:03:13 +00:00
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#include "config.h"
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2016-03-01 13:13:41 +00:00
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#include "ssh-base.h"
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#include <extcap/extcap-base.h>
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#include <log.h>
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2016-03-04 09:53:56 +00:00
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#include <string.h>
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2016-03-01 13:13:41 +00:00
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2016-08-31 08:14:33 +00:00
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ssh_session create_ssh_connection(const char* hostname, const guint16 port, const char* username,
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2016-03-01 13:13:41 +00:00
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const char* password, const char* sshkey_path, const char* sshkey_passphrase, char** err_info)
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{
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ssh_session sshs;
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/* Open session and set options */
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sshs = ssh_new();
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if (sshs == NULL) {
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2016-06-06 02:24:47 +00:00
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*err_info = g_strdup("Can't create ssh session");
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2016-03-01 13:13:41 +00:00
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return NULL;
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}
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if (!hostname) {
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2016-06-06 02:24:47 +00:00
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*err_info = g_strdup("Hostname needed");
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2016-03-01 13:13:41 +00:00
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goto failure;
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}
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if (ssh_options_set(sshs, SSH_OPTIONS_HOST, hostname)) {
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*err_info = g_strdup_printf("Can't set the hostname: %s", hostname);
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goto failure;
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}
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if (port != 0) {
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if (ssh_options_set(sshs, SSH_OPTIONS_PORT, &port)) {
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*err_info = g_strdup_printf("Can't set the port: %d", port);
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goto failure;
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}
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}
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if (!username)
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username = g_get_user_name();
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if (ssh_options_set(sshs, SSH_OPTIONS_USER, username)) {
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*err_info = g_strdup_printf("Can't set the username: %s", username);
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goto failure;
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}
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Opening ssh connection to %s@%s:%u", username, hostname, port);
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/* Connect to server */
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if (ssh_connect(sshs) != SSH_OK) {
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*err_info = g_strdup_printf("Error connecting to %s@%s:%u (%s)", username, hostname, port,
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ssh_get_error(sshs));
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goto failure;
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}
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#ifdef HAVE_LIBSSH_USERAUTH_AGENT
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2017-10-14 20:04:14 +00:00
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Connecting using ssh-agent...");
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2016-03-01 13:13:41 +00:00
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/* Try to authenticate using ssh agent */
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if (ssh_userauth_agent(sshs, NULL) == SSH_AUTH_SUCCESS) {
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "done");
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return sshs;
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}
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2017-10-14 20:04:14 +00:00
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "failed");
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2016-03-01 13:13:41 +00:00
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#endif
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/* If a public key path has been provided, try to authenticate using it */
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if (sshkey_path) {
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ssh_key pkey = ssh_key_new();
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int ret;
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Connecting using public key in %s...", sshkey_path);
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ret = ssh_pki_import_privkey_file(sshkey_path, sshkey_passphrase, NULL, NULL, &pkey);
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if (ret == SSH_OK) {
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if (ssh_userauth_publickey(sshs, NULL, pkey) == SSH_AUTH_SUCCESS) {
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "done");
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ssh_key_free(pkey);
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return sshs;
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}
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}
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ssh_key_free(pkey);
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "failed (%s)", ssh_get_error(sshs));
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}
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/* Try to authenticate using standard public key */
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Connecting using standard public key...");
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if (ssh_userauth_publickey_auto(sshs, NULL, NULL) == SSH_AUTH_SUCCESS) {
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "done");
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return sshs;
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}
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "failed");
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/* If a password has been provided and all previous attempts failed, try to use it */
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if (password) {
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "Connecting using password...");
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if (ssh_userauth_password(sshs, username, password) == SSH_AUTH_SUCCESS) {
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "done");
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return sshs;
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}
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g_log(LOG_DOMAIN_CAPTURE_CHILD, G_LOG_LEVEL_INFO, "failed");
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}
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*err_info = g_strdup_printf("Can't find a valid authentication. Disconnecting.");
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/* All authentication failed. Disconnect and return */
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ssh_disconnect(sshs);
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failure:
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ssh_free(sshs);
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return NULL;
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}
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2016-03-04 09:53:56 +00:00
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int ssh_channel_printf(ssh_channel channel, const char* fmt, ...)
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{
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gchar* buf;
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va_list arg;
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int ret = EXIT_SUCCESS;
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va_start(arg, fmt);
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buf = g_strdup_vprintf(fmt, arg);
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if (ssh_channel_write(channel, buf, (guint32)strlen(buf)) == SSH_ERROR)
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ret = EXIT_FAILURE;
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va_end(arg);
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g_free(buf);
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return ret;
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}
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2016-03-01 13:13:41 +00:00
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void ssh_cleanup(ssh_session* sshs, ssh_channel* channel)
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{
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if (*channel) {
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ssh_channel_send_eof(*channel);
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ssh_channel_close(*channel);
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ssh_channel_free(*channel);
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*channel = NULL;
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}
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if (*sshs) {
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ssh_disconnect(*sshs);
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ssh_free(*sshs);
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*sshs = NULL;
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}
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 8
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* tab-width: 8
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* indent-tabs-mode: t
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* End:
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*
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* vi: set shiftwidth=8 tabstop=8 noexpandtab:
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* :indentSize=8:tabSize=8:noTabs=false:
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2016-05-03 05:28:42 +00:00
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*/
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