![Dario Lombardo](/assets/img/avatar_default.png)
Change-Id: I07bd2a95622187c6bacb3013998f93bfa07af87c Reviewed-on: https://code.wireshark.org/review/14338 Petri-Dish: Dario Lombardo <lomato@gmail.com> Tested-by: Petri Dish Buildbot <buildbot-no-reply@wireshark.org> Reviewed-by: Michael Mann <mmann78@netscape.net> Reviewed-by: Anders Broman <a.broman58@gmail.com>
549 lines
16 KiB
C
549 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 <wsutil/interface.h>
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#include <extcap/ssh-base.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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#ifndef STDERR_FILENO
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#define STDERR_FILENO 2
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#endif
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#ifndef STDOUT_FILENO
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#define STDOUT_FILENO 1
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#endif
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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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#define DEFAULT_CAPTURE_BIN "dumpcap"
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#define verbose_print(...) { if (verbose) printf(__VA_ARGS__); }
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static gboolean verbose = FALSE;
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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_VERBOSE,
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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_BIN,
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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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};
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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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{ "verbose", optional_argument, NULL, OPT_VERBOSE},
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{ "remote-host", required_argument, NULL, OPT_REMOTE_HOST},
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{ "remote-port", required_argument, NULL, OPT_REMOTE_PORT},
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{ "remote-username", required_argument, NULL, OPT_REMOTE_USERNAME},
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{ "remote-password", required_argument, NULL, OPT_REMOTE_PASSWORD},
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{ "remote-interface", required_argument, NULL, OPT_REMOTE_INTERFACE},
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{ "remote-capture-bin", required_argument, NULL, OPT_REMOTE_CAPTURE_BIN},
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{ "remote-filter", required_argument, NULL, OPT_REMOTE_FILTER},
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{ "remote-count", required_argument, NULL, OPT_REMOTE_COUNT},
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{ "sshkey", required_argument, NULL, OPT_SSHKEY},
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{ "sshkey-passphrase", required_argument, NULL, OPT_SSHKEY_PASSPHRASE},
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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 void ssh_loop_read(ssh_channel channel, int fd)
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{
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int nbytes;
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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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do {
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nbytes = ssh_channel_read(channel, buffer, SSH_READ_BLOCK_SIZE, 0);
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if (write(fd, buffer, nbytes) != nbytes) {
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errmsg_print("ERROR reading: %s", g_strerror(errno));
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return;
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}
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} while(nbytes > 0);
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/* read loop finished... maybe something wrong happened. Read from stderr */
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do {
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nbytes = ssh_channel_read(channel, buffer, SSH_READ_BLOCK_SIZE, 1);
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if (write(STDERR_FILENO, buffer, nbytes) != nbytes) {
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return;
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}
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} while(nbytes > 0);
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if (ssh_channel_send_eof(channel) != SSH_OK)
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return;
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}
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static char* local_interfaces_to_filter(const unsigned int 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_bin, const char* iface, const char* cfilter,
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unsigned long int count)
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{
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gchar* cmdline;
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ssh_channel channel;
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char* quoted_bin;
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char* quoted_iface;
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char* default_filter;
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char* quoted_filter;
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char* count_str = NULL;
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unsigned int remote_port = 22;
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if (!capture_bin)
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capture_bin = DEFAULT_CAPTURE_BIN;
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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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return NULL;
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if (ssh_channel_open_session(channel) != SSH_OK) {
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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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quoted_bin = g_shell_quote(capture_bin);
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quoted_iface = g_shell_quote(iface);
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default_filter = local_interfaces_to_filter(remote_port);
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if (!cfilter)
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cfilter = default_filter;
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quoted_filter = g_shell_quote(cfilter);
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if (count > 0)
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count_str = g_strdup_printf("-c %lu", count);
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cmdline = g_strdup_printf("%s -i %s -P -w - -f %s %s", quoted_bin, quoted_iface, quoted_filter,
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count_str ? count_str : "");
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verbose_print("Running: %s\n", cmdline);
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if (ssh_channel_request_exec(channel, cmdline) != SSH_OK) {
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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_bin);
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g_free(quoted_iface);
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g_free(default_filter);
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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_bin,
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const unsigned long int 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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int fd = STDOUT_FILENO;
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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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fd = open(fifo, O_WRONLY);
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if (fd == -1) {
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fd = open(fifo, O_WRONLY | O_CREAT, 0640);
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if (fd == -1) {
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errmsg_print("Error creating output file: %s", g_strerror(errno));
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return EXIT_FAILURE;
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}
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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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errmsg_print("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_bin, iface, cfilter, count);
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if (!channel)
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goto cleanup;
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/* read from channel and write into fd */
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ssh_loop_read(channel, fd);
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ret = EXIT_SUCCESS;
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cleanup:
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if (err_info)
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errmsg_print("%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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close(fd);
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return ret;
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}
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static void help(const char* binname)
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{
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printf("Help\n");
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printf(" Usage:\n");
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printf(" %s --extcap-interfaces\n", binname);
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printf(" %s --extcap-interface=INTERFACE --extcap-dlts\n", binname);
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printf(" %s --extcap-interface=INTERFACE --extcap-config\n", binname);
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printf(" %s --extcap-interface=INTERFACE --remote-host myhost --remote-port 22222 "
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"--remote-username myuser --remote-interface eth2 --remote-capture-bin /bin/dumpcap "
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"--fifo=FILENAME --capture\n", binname);
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printf("\n\n");
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printf(" --help: print this help\n");
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printf(" --version: print the version\n");
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printf(" --verbose: print more messages\n");
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printf(" --extcap-interfaces: list the interfaces\n");
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printf(" --extcap-interface <iface>: specify the interface\n");
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printf(" --extcap-dlts: list the DTLs for an interface\n");
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printf(" --extcap-config: list the additional configuration for an interface\n");
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printf(" --extcap-capture-filter <filter>: the capture filter\n");
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printf(" --capture: run the capture\n");
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printf(" --fifo <file>: dump data to file or fifo\n");
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printf(" --remote-host <host>: the remote SSH host\n");
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printf(" --remote-port <port>: the remote SSH port (default: 22)\n");
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printf(" --remote-username <username>: the remote SSH username (default: the current user)\n");
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printf(" --remote-password <password>: the remote SSH password. If not specified, ssh-agent and ssh-key are used\n");
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printf(" --sshkey <public key path>: the path of the ssh key\n");
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printf(" --sshkey-passphrase <public key passphrase>: the passphrase to unlock public ssh\n");
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printf(" --remote-interface <iface>: the remote capture interface (default: eth0)\n");
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printf(" --remote-capture-bin <capture bin>: the remote dumcap binary (default: %s)\n", DEFAULT_CAPTURE_BIN);
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printf(" --remote-filter <filter>: a filter for remote capture (default: don't listen on local local interfaces IPs)\n");
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}
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static char* interfaces_list_to_filter(GSList* interfaces, 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->next != NULL) {
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g_string_append_printf(filter, " or host %s", (char*)cur->data);
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cur = cur->next;
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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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errmsg_print("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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errmsg_print("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-bin}{display=Remote capture binary}"
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"{type=string}{default=%s}{tooltip=The remote dumpcap binary used "
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"for capture.}\n", inc++, DEFAULT_CAPTURE_BIN);
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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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unsigned int 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_bin = 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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unsigned long int count = 0;
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int ret = 0;
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extcap_parameters * extcap_conf = g_new0(extcap_parameters, 1);
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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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extcap_base_set_util_info(extcap_conf, SSHDUMP_VERSION_MAJOR, SSHDUMP_VERSION_MINOR, SSHDUMP_VERSION_RELEASE, NULL);
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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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opterr = 0;
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optind = 0;
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if (argc == 1) {
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help(argv[0]);
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return EXIT_FAILURE;
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}
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for (i = 0; i < argc; i++) {
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verbose_print("%s ", argv[i]);
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}
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verbose_print("\n");
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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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help(argv[0]);
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return EXIT_SUCCESS;
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case OPT_VERBOSE:
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verbose = TRUE;
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break;
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case OPT_VERSION:
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printf("%s.%s.%s\n", SSHDUMP_VERSION_MAJOR, SSHDUMP_VERSION_MINOR, SSHDUMP_VERSION_RELEASE);
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return EXIT_SUCCESS;
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case OPT_REMOTE_HOST:
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if (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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remote_port = (unsigned int)strtoul(optarg, NULL, 10);
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if (remote_port > 65535 || remote_port == 0) {
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errmsg_print("Invalid port: %s", optarg);
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return EXIT_FAILURE;
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}
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break;
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case OPT_REMOTE_USERNAME:
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if (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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if (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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if (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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if (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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if (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_BIN:
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if (remote_capture_bin)
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g_free(remote_capture_bin);
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remote_capture_bin = g_strdup(optarg);
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break;
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case OPT_REMOTE_FILTER:
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if (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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count = strtoul(optarg, NULL, 10);
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break;
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case ':':
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/* missing option argument */
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errmsg_print("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)) {
|
|
errmsg_print("Invalid option: %s", argv[optind - 1]);
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (optind != argc) {
|
|
errmsg_print("Unexpected extra option: %s", argv[optind]);
|
|
return EXIT_FAILURE;
|
|
}
|
|
|
|
if (extcap_base_handle_interface(extcap_conf))
|
|
return EXIT_SUCCESS;
|
|
|
|
if (extcap_conf->show_config)
|
|
return list_config(extcap_conf->interface, remote_port);
|
|
|
|
#ifdef _WIN32
|
|
result = WSAStartup(MAKEWORD(1,1), &wsaData);
|
|
if (result != 0) {
|
|
if (verbose)
|
|
errmsg_print("ERROR: WSAStartup failed with error: %d", result);
|
|
return EXIT_FAILURE;
|
|
}
|
|
#endif /* _WIN32 */
|
|
|
|
if (extcap_conf->capture) {
|
|
char* filter;
|
|
|
|
if (!remote_host) {
|
|
errmsg_print("Missing parameter: --remote-host");
|
|
return EXIT_FAILURE;
|
|
}
|
|
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_bin, count, extcap_conf->fifo);
|
|
g_free(filter);
|
|
} else {
|
|
verbose_print("You should not come here... maybe some parameter missing?\n");
|
|
ret = EXIT_FAILURE;
|
|
}
|
|
|
|
/* clean up stuff */
|
|
extcap_base_cleanup(&extcap_conf);
|
|
return ret;
|
|
}
|
|
|
|
#ifdef _WIN32
|
|
int CALLBACK WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
|
|
LPSTR lpCmdLine, 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:
|
|
*/
|