![AndersBroman](/assets/img/avatar_default.png)
Change-Id: I510af18d433c4db360243dda72260e59eb84355f Reviewed-on: https://code.wireshark.org/review/20336 Reviewed-by: Anders Broman <a.broman58@gmail.com>
562 lines
16 KiB
C
562 lines
16 KiB
C
/* sshdump.c
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* sshdump is extcap tool used to capture data using a remote ssh host
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*
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* Copyright 2015, 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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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <extcap/extcap-base.h>
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#include <extcap/ssh-base.h>
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#include <wsutil/interface.h>
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#include <wsutil/file_util.h>
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#include <wsutil/strtoi.h>
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#include <wsutil/filesystem.h>
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#include <wsutil/glib-compat.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#define SSHDUMP_VERSION_MAJOR "1"
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#define SSHDUMP_VERSION_MINOR "0"
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#define SSHDUMP_VERSION_RELEASE "0"
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#define SSH_EXTCAP_INTERFACE "ssh"
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#define SSH_READ_BLOCK_SIZE 256
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enum {
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EXTCAP_BASE_OPTIONS_ENUM,
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OPT_HELP,
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OPT_VERSION,
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OPT_REMOTE_HOST,
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OPT_REMOTE_PORT,
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OPT_REMOTE_USERNAME,
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OPT_REMOTE_PASSWORD,
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OPT_REMOTE_INTERFACE,
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OPT_REMOTE_CAPTURE_COMMAND,
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OPT_REMOTE_FILTER,
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OPT_SSHKEY,
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OPT_SSHKEY_PASSPHRASE,
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OPT_REMOTE_COUNT,
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OPT_REMOTE_SUDO
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};
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static struct option longopts[] = {
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EXTCAP_BASE_OPTIONS,
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{ "help", no_argument, NULL, OPT_HELP},
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{ "version", no_argument, NULL, OPT_VERSION},
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SSH_BASE_OPTIONS,
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{ "remote-capture-command", required_argument, NULL, OPT_REMOTE_CAPTURE_COMMAND},
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{ "remote-sudo", required_argument, NULL, OPT_REMOTE_SUDO },
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{ 0, 0, 0, 0}
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};
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static char* interfaces_list_to_filter(GSList* if_list, const unsigned int remote_port);
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static int ssh_loop_read(ssh_channel channel, FILE* fp)
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{
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int nbytes;
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int ret = EXIT_SUCCESS;
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char buffer[SSH_READ_BLOCK_SIZE];
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/* read from stdin until data are available */
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while (ssh_channel_is_open(channel) && !ssh_channel_is_eof(channel)) {
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nbytes = ssh_channel_read(channel, buffer, SSH_READ_BLOCK_SIZE, 0);
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if (nbytes < 0) {
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g_warning("Error reading from channel");
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goto end;
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}
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if (nbytes == 0) {
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goto end;
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}
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if (fwrite(buffer, 1, nbytes, fp) != (guint)nbytes) {
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g_warning("Error writing to fifo");
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ret = EXIT_FAILURE;
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goto end;
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}
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fflush(fp);
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}
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/* read loop finished... maybe something wrong happened. Read from stderr */
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while (ssh_channel_is_open(channel) && !ssh_channel_is_eof(channel)) {
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nbytes = ssh_channel_read(channel, buffer, SSH_READ_BLOCK_SIZE, 1);
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if (nbytes < 0) {
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g_warning("Error reading from channel");
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goto end;
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}
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if (fwrite(buffer, 1, nbytes, stderr) != (guint)nbytes) {
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g_warning("Error writing to stderr");
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break;
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}
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}
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end:
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if (ssh_channel_send_eof(channel) != SSH_OK) {
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g_warning("Error sending EOF in ssh channel");
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ret = EXIT_FAILURE;
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}
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return ret;
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}
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static char* local_interfaces_to_filter(const guint16 remote_port)
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{
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GSList* interfaces = local_interfaces_to_list();
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char* filter = interfaces_list_to_filter(interfaces, remote_port);
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g_slist_free_full(interfaces, g_free);
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return filter;
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}
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static ssh_channel run_ssh_command(ssh_session sshs, const char* capture_command, const gboolean use_sudo, const char* iface,
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const char* cfilter, const guint32 count)
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{
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gchar* cmdline;
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ssh_channel channel;
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char* quoted_iface = NULL;
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char* quoted_filter = NULL;
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char* count_str = NULL;
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unsigned int remote_port = 22;
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if (!iface)
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iface = "eth0";
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channel = ssh_channel_new(sshs);
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if (!channel) {
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g_warning("Can't create channel");
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return NULL;
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}
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if (ssh_channel_open_session(channel) != SSH_OK) {
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g_warning("Can't open session");
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ssh_channel_free(channel);
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return NULL;
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}
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ssh_options_get_port(sshs, &remote_port);
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/* escape parameters to go save with the shell */
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if (capture_command && *capture_command) {
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cmdline = g_strdup(capture_command);
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g_debug("Remote capture command has disabled other options");
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} else {
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quoted_iface = g_shell_quote(iface);
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quoted_filter = g_shell_quote(cfilter ? cfilter : "");
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if (count > 0)
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count_str = g_strdup_printf("-c %u", count);
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cmdline = g_strdup_printf("%s tcpdump -U -i %s -w - %s %s", use_sudo ? "sudo" : "", quoted_iface,
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count_str ? count_str : "", quoted_filter);
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}
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g_debug("Running: %s", cmdline);
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if (ssh_channel_request_exec(channel, cmdline) != SSH_OK) {
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g_warning("Can't request exec");
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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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g_free(quoted_iface);
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g_free(quoted_filter);
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g_free(cmdline);
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if (count_str)
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g_free(count_str);
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return channel;
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}
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static int ssh_open_remote_connection(const char* hostname, const unsigned int port, const char* username, const char* password,
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const char* sshkey, const char* sshkey_passphrase, const char* iface, const char* cfilter, const char* capture_command,
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const gboolean use_sudo, const guint32 count, const char* fifo)
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{
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ssh_session sshs = NULL;
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ssh_channel channel = NULL;
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FILE* fp = stdout;
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int ret = EXIT_FAILURE;
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char* err_info = NULL;
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if (g_strcmp0(fifo, "-")) {
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/* Open or create the output file */
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fp = fopen(fifo, "wb");
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if (fp == NULL) {
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g_warning("Error creating output file: %s (%s)", fifo, g_strerror(errno));
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return EXIT_FAILURE;
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}
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}
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sshs = create_ssh_connection(hostname, port, username, password, sshkey, sshkey_passphrase, &err_info);
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if (!sshs) {
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g_warning("Error creating connection: %s", err_info);
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goto cleanup;
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}
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channel = run_ssh_command(sshs, capture_command, use_sudo, iface, cfilter, count);
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if (!channel) {
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g_warning("Can't run ssh command");
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goto cleanup;
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}
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/* read from channel and write into fp */
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if (ssh_loop_read(channel, fp) != EXIT_SUCCESS) {
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g_warning("Error in read loop");
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ret = EXIT_FAILURE;
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goto cleanup;
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}
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ret = EXIT_SUCCESS;
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cleanup:
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if (err_info)
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g_warning("%s", err_info);
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g_free(err_info);
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/* clean up and exit */
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ssh_cleanup(&sshs, &channel);
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if (g_strcmp0(fifo, "-"))
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fclose(fp);
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return ret;
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}
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static char* interfaces_list_to_filter(GSList* interfaces, const unsigned int remote_port)
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{
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GString* filter = g_string_new(NULL);
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GSList* cur;
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if (!interfaces) {
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g_string_append_printf(filter, "not port %u", remote_port);
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} else {
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g_string_append_printf(filter, "not ((host %s", (char*)interfaces->data);
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cur = g_slist_next(interfaces);
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while (cur) {
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g_string_append_printf(filter, " or host %s", (char*)cur->data);
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cur = g_slist_next(cur);
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}
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g_string_append_printf(filter, ") and port %u)", remote_port);
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}
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return g_string_free(filter, FALSE);
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}
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static int list_config(char *interface, unsigned int remote_port)
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{
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unsigned inc = 0;
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char* ipfilter;
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if (!interface) {
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g_warning("ERROR: No interface specified.");
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return EXIT_FAILURE;
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}
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if (g_strcmp0(interface, SSH_EXTCAP_INTERFACE)) {
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g_warning("ERROR: interface must be %s", SSH_EXTCAP_INTERFACE);
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return EXIT_FAILURE;
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}
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ipfilter = local_interfaces_to_filter(remote_port);
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printf("arg {number=%u}{call=--remote-host}{display=Remote SSH server address}"
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"{type=string}{tooltip=The remote SSH host. It can be both "
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"an IP address or a hostname}{required=true}\n", inc++);
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printf("arg {number=%u}{call=--remote-port}{display=Remote SSH server port}"
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"{type=unsigned}{default=22}{tooltip=The remote SSH host port (1-65535)}"
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"{range=1,65535}\n", inc++);
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printf("arg {number=%u}{call=--remote-username}{display=Remote SSH server username}"
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"{type=string}{default=%s}{tooltip=The remote SSH username. If not provided, "
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"the current user will be used}\n", inc++, g_get_user_name());
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printf("arg {number=%u}{call=--remote-password}{display=Remote SSH server password}"
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"{type=password}{tooltip=The SSH password, used when other methods (SSH agent "
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"or key files) are unavailable.}\n", inc++);
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printf("arg {number=%u}{call=--sshkey}{display=Path to SSH private key}"
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"{type=fileselect}{tooltip=The path on the local filesystem of the private ssh key}\n",
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inc++);
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printf("arg {number=%u}{call=--sshkey-passphrase}{display=SSH key passphrase}"
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"{type=password}{tooltip=Passphrase to unlock the SSH private key}\n",
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inc++);
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printf("arg {number=%u}{call=--remote-interface}{display=Remote interface}"
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"{type=string}{default=eth0}{tooltip=The remote network interface used for capture"
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"}\n", inc++);
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printf("arg {number=%u}{call=--remote-capture-command}{display=Remote capture command}"
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"{type=string}{tooltip=The remote command used to capture}\n", inc++);
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printf("arg {number=%u}{call=--remote-sudo}{display=Use sudo on the remote machine}"
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"{type=boolean}{tooltip=Prepend the capture command with sudo on the remote machine}\n", inc++);
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printf("arg {number=%u}{call=--remote-filter}{display=Remote capture filter}"
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"{type=string}{tooltip=The remote capture filter}", inc++);
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if (ipfilter)
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printf("{default=%s}", ipfilter);
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printf("\n");
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printf("arg {number=%u}{call=--remote-count}{display=Packets to capture}"
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"{type=unsigned}{default=0}{tooltip=The number of remote packets to capture. (Default: inf)}\n",
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inc++);
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g_free(ipfilter);
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return EXIT_SUCCESS;
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}
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static char* concat_filters(const char* extcap_filter, const char* remote_filter)
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{
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if (!extcap_filter && remote_filter)
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return g_strdup(remote_filter);
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if (!remote_filter && extcap_filter)
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return g_strdup(extcap_filter);
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if (!remote_filter && !extcap_filter)
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return NULL;
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return g_strdup_printf("(%s) and (%s)", extcap_filter, remote_filter);
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}
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int main(int argc, char **argv)
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{
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int result;
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int option_idx = 0;
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int i;
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char* remote_host = NULL;
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guint16 remote_port = 22;
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char* remote_username = NULL;
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char* remote_password = NULL;
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char* remote_interface = NULL;
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char* remote_capture_command = NULL;
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char* sshkey = NULL;
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char* sshkey_passphrase = NULL;
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char* remote_filter = NULL;
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guint32 count = 0;
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int ret = EXIT_FAILURE;
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extcap_parameters * extcap_conf = g_new0(extcap_parameters, 1);
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char* help_url;
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char* help_header = NULL;
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gboolean use_sudo = FALSE;
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#ifdef _WIN32
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WSADATA wsaData;
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attach_parent_console();
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#endif /* _WIN32 */
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help_url = data_file_url("sshdump.html");
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extcap_base_set_util_info(extcap_conf, argv[0], SSHDUMP_VERSION_MAJOR, SSHDUMP_VERSION_MINOR,
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SSHDUMP_VERSION_RELEASE, help_url);
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g_free(help_url);
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extcap_base_register_interface(extcap_conf, SSH_EXTCAP_INTERFACE, "SSH remote capture", 147, "Remote capture dependent DLT");
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help_header = g_strdup_printf(
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" %s --extcap-interfaces\n"
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" %s --extcap-interface=%s --extcap-dlts\n"
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" %s --extcap-interface=%s --extcap-config\n"
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" %s --extcap-interface=%s --remote-host myhost --remote-port 22222 "
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"--remote-username myuser --remote-interface eth2 --remote-capture-command 'tcpdump -U -i eth0 -w -' "
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"--fifo=FILENAME --capture\n", argv[0], argv[0], SSH_EXTCAP_INTERFACE, argv[0],
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SSH_EXTCAP_INTERFACE, argv[0], SSH_EXTCAP_INTERFACE);
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extcap_help_add_header(extcap_conf, help_header);
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g_free(help_header);
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extcap_help_add_option(extcap_conf, "--help", "print this help");
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extcap_help_add_option(extcap_conf, "--version", "print the version");
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extcap_help_add_option(extcap_conf, "--remote-host <host>", "the remote SSH host");
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extcap_help_add_option(extcap_conf, "--remote-port <port>", "the remote SSH port (default: 22)");
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extcap_help_add_option(extcap_conf, "--remote-username <username>", "the remote SSH username (default: the current user)");
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extcap_help_add_option(extcap_conf, "--remote-password <password>", "the remote SSH password. If not specified, ssh-agent and ssh-key are used");
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extcap_help_add_option(extcap_conf, "--sshkey <public key path>", "the path of the ssh key");
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extcap_help_add_option(extcap_conf, "--sshkey-passphrase <public key passphrase>", "the passphrase to unlock public ssh");
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extcap_help_add_option(extcap_conf, "--remote-interface <iface>", "the remote capture interface (default: eth0)");
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extcap_help_add_option(extcap_conf, "--remote-capture-command <capture command>", "the remote capture command");
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extcap_help_add_option(extcap_conf, "--remote-sudo yes", "use sudo on the remote machine to capture");
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extcap_help_add_option(extcap_conf, "--remote-filter <filter>", "a filter for remote capture (default: don't "
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"listen on local interfaces IPs)");
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extcap_help_add_option(extcap_conf, "--remote-count <count>", "the number of packets to capture");
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opterr = 0;
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optind = 0;
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if (argc == 1) {
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extcap_help_print(extcap_conf);
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goto end;
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}
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while ((result = getopt_long(argc, argv, ":", longopts, &option_idx)) != -1) {
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switch (result) {
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case OPT_HELP:
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extcap_help_print(extcap_conf);
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ret = EXIT_SUCCESS;
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goto end;
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case OPT_VERSION:
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printf("%s\n", extcap_conf->version);
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ret = EXIT_SUCCESS;
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goto end;
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case OPT_REMOTE_HOST:
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g_free(remote_host);
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remote_host = g_strdup(optarg);
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break;
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case OPT_REMOTE_PORT:
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if (!ws_strtou16(optarg, NULL, &remote_port) || remote_port == 0) {
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g_warning("Invalid port: %s", optarg);
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goto end;
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}
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break;
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case OPT_REMOTE_USERNAME:
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g_free(remote_username);
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remote_username = g_strdup(optarg);
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break;
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case OPT_REMOTE_PASSWORD:
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g_free(remote_password);
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remote_password = g_strdup(optarg);
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memset(optarg, 'X', strlen(optarg));
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break;
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case OPT_SSHKEY:
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g_free(sshkey);
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sshkey = g_strdup(optarg);
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break;
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case OPT_SSHKEY_PASSPHRASE:
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g_free(sshkey_passphrase);
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sshkey_passphrase = g_strdup(optarg);
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memset(optarg, 'X', strlen(optarg));
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break;
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case OPT_REMOTE_INTERFACE:
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g_free(remote_interface);
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remote_interface = g_strdup(optarg);
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break;
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case OPT_REMOTE_CAPTURE_COMMAND:
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g_free(remote_capture_command);
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remote_capture_command = g_strdup(optarg);
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break;
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case OPT_REMOTE_SUDO:
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use_sudo = TRUE;
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break;
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case OPT_REMOTE_FILTER:
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g_free(remote_filter);
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remote_filter = g_strdup(optarg);
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break;
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case OPT_REMOTE_COUNT:
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if (!ws_strtou32(optarg, NULL, &count)) {
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g_warning("Invalid value for count: %s", optarg);
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goto end;
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}
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break;
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case ':':
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/* missing option argument */
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g_warning("Option '%s' requires an argument", argv[optind - 1]);
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break;
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default:
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if (!extcap_base_parse_options(extcap_conf, result - EXTCAP_OPT_LIST_INTERFACES, optarg)) {
|
|
g_warning("Invalid option: %s", argv[optind - 1]);
|
|
goto end;
|
|
}
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < argc; i++)
|
|
g_debug("%s", argv[i]);
|
|
|
|
if (optind != argc) {
|
|
g_warning("Unexpected extra option: %s", argv[optind]);
|
|
goto end;
|
|
}
|
|
|
|
if (extcap_base_handle_interface(extcap_conf)) {
|
|
ret = EXIT_SUCCESS;
|
|
goto end;
|
|
}
|
|
|
|
if (extcap_conf->show_config) {
|
|
ret = list_config(extcap_conf->interface, remote_port);
|
|
goto end;
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
result = WSAStartup(MAKEWORD(1,1), &wsaData);
|
|
if (result != 0) {
|
|
g_warning("ERROR: WSAStartup failed with error: %d", result);
|
|
goto end;
|
|
}
|
|
#endif /* _WIN32 */
|
|
|
|
if (extcap_conf->capture) {
|
|
char* filter;
|
|
|
|
if (!remote_host) {
|
|
g_warning("Missing parameter: --remote-host");
|
|
goto end;
|
|
}
|
|
filter = concat_filters(extcap_conf->capture_filter, remote_filter);
|
|
ret = ssh_open_remote_connection(remote_host, remote_port, remote_username,
|
|
remote_password, sshkey, sshkey_passphrase, remote_interface,
|
|
filter, remote_capture_command, use_sudo, count, extcap_conf->fifo);
|
|
g_free(filter);
|
|
} else {
|
|
g_debug("You should not come here... maybe some parameter missing?");
|
|
ret = EXIT_FAILURE;
|
|
}
|
|
|
|
end:
|
|
/* clean up stuff */
|
|
g_free(remote_host);
|
|
g_free(remote_username);
|
|
g_free(remote_password);
|
|
g_free(remote_interface);
|
|
g_free(remote_capture_command);
|
|
g_free(sshkey);
|
|
g_free(sshkey_passphrase);
|
|
g_free(remote_filter);
|
|
extcap_base_cleanup(&extcap_conf);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
int _stdcall
|
|
WinMain (struct HINSTANCE__ *hInstance,
|
|
struct HINSTANCE__ *hPrevInstance,
|
|
char *lpszCmdLine,
|
|
int nCmdShow)
|
|
{
|
|
return main(__argc, __argv);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Editor modelines - https://www.wireshark.org/tools/modelines.html
|
|
*
|
|
* Local variables:
|
|
* c-basic-offset: 8
|
|
* tab-width: 8
|
|
* indent-tabs-mode: t
|
|
* End:
|
|
*
|
|
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
|
|
* :indentSize=8:tabSize=8:noTabs=false:
|
|
*/
|