SSHDIG(1) | SSHDIG(1) |
NAME
sshdig - Provide interfaces to capture system calls from a remote host through SSH using a remote capture binary.
SYNOPSIS
sshdig [ --help ] [ --version ] [ --extcap-interfaces ] [ --extcap-dlts ] [ --extcap-interface=<interface> ] [ --extcap-config ] [ --extcap-capture-filter=<capture filter> ] [ --capture ] [ --fifo=<path to file or pipe> ] [ --remote-host=<IP address> ] [ --remote-port=<TCP port> ] [ --remote-username=<username> ] [ --remote-password=<password> ] [ --sshkey=<private key path> ] [ --sshkey-passphrase=<private key passphrase> ] [ --proxycommand=<SSH proxy command> ] [ --remote-capture-command-select=<capture command selection> ] [ --remote-capture-command=<capture command> ] [ --remote-priv=<privilege elevation command selection> ] [ --remote-priv-user=<privileged user name> ] [ --remote-filter=<remote capture filter> ] [ --remote-count=<number> ] [ --remote-modern-bpf ] [ --remote-io-snaplen=<snapshot length> ]
sshdig --extcap-interfaces
sshdig --extcap-interface=<interface> --extcap-dlts
sshdig --extcap-interface=<interface> --extcap-config
sshdig --extcap-interface=<interface> --fifo=<path to file or pipe> --capture --remote-host=myremotehost --remote-port=22 --remote-username=user --remote-capture-command='sysdig --unbuffered --write=-'
DESCRIPTION
Sshdig is an extcap tool that allows one to capture system calls over a SSH connection. You must have permission to capture system calls on the remote system.
The feature is functionally equivalent to
$ ssh remoteuser@remotehost -p 22222 'sysdig --unbuffered -w -' > FILE & $ stratoshark FILE
Typically sshdig is not invoked directly. Instead it can be configured through the Stratoshark graphical user interface or its command line. The following will start Stratoshark and start capturing from host remotehost:
$ stratoshark '-oextcap.sshdig.remotehost:myserver.home.arpa' -i sshdig -k
Supported interfaces:
OPTIONS
--help
--version
--extcap-interfaces
--extcap-interface=<interface>
--extcap-dlts
--extcap-config
--extcap-capture-filter=<capture filter>
--capture
--fifo=<path to file or pipe>
--remote-host=<remote host>
--remote-port=<remote port>
--remote-username=<username>
--remote-password=<password>
--sshkey=<SSH private key path>
--sshkey-passphrase=<SSH private key passphrase>
--proxycommand=<proxy command>
--remote-capture-command-select=<capture command-selection>
--remote-capture-command=<capture command>
--remote-priv=<privilege elevation command selection>
--remote-priv-user=<privileged user name>
--remote-filter=<capture filter>
--remote-count=<number>
--remote-modern-bpf
--remote-io-snaplen=<snapshot length>
EXAMPLES
To see program arguments:
sshdig --help
To see program version:
sshdig --version
To see interfaces:
sshdig --extcap-interfaces
Only one interface (sshdig) is supported.
Example output
interface {value=sshdig}{display=SSH remote syscall capture}
To see interface DLTs:
sshdig --extcap-interface=sshdig --extcap-dlts
Example output
dlt {number=147}{name=sshdig}{display=Remote capture dependent DLT}
To see interface configuration options:
sshdig --extcap-interface=sshdig --extcap-config
Example output
arg {number=0}{call=--remote-host}{display=Remote SSH server address}{type=string}{tooltip=The remote SSH host. It can be both an IP address or a hostname}{required=true}{group=Server} arg {number=1}{call=--remote-port}{display=Remote SSH server port}{type=unsigned}{default=22}{tooltip=The remote SSH host port (1-65535)}{range=1,65535}{group=Server} arg {number=2}{call=--remote-username}{display=Remote SSH server username}{type=string}{tooltip=The remote SSH username. If not provided, the current user will be used}{group=Authentication} arg {number=3}{call=--remote-password}{display=Remote SSH server password}{type=password}{tooltip=The SSH password, used when other methods (SSH agent or key files) are unavailable.}{group=Authentication} arg {number=4}{call=--sshkey}{display=Path to SSH private key}{type=fileselect}{tooltip=The path on the local filesystem of the private SSH key (OpenSSH format)}{mustexist=true}{group=Authentication} arg {number=5}{call=--sshkey-passphrase}{display=SSH key passphrase}{type=password}{tooltip=Passphrase to unlock the SSH private key}{group=Authentication} arg {number=6}{call=--proxycommand}{display=ProxyCommand}{type=string}{tooltip=The command to use as proxy for the SSH connection}{group=Authentication} arg {number=7}{call=--ssh-sha1}{display=Support SHA-1 keys (deprecated)}{type=boolflag}{tooltip=Support keys and key exchange algorithms using SHA-1 (deprecated)}{group=Authentication} arg {number=8}{call=--remote-capture-command-select}{display=Remote capture command selection}{type=radio}{tooltip=The remote capture command to build a command line for}{group=Capture} value {arg=8}{value=sysdig}{display=sysdig} value {arg=8}{value=other}{display=Other:} arg {number=9}{call=--remote-capture-command}{display=Remote capture command}{type=string}{tooltip=The remote command used to capture}{group=Capture} arg {number=10}{call=--remote-priv}{display=Gain capture privilege on the remote machine}{type=radio}{tooltip=Optionally prepend the capture command with sudo or doas on the remote machine}{group=Capture} value {arg=10}{value=none}{display=none}{default=true} value {arg=10}{value=sudo}{display=sudo} value {arg=10}{value=doas -n}{display=doas} arg {number=11}{call=--remote-priv-user}{display=Privileged user name for sudo or doas}{type=string}{tooltip=User name of privileged user to execute the capture command on the remote machine}{group=Capture} {group=Capture} arg {number=12}{call=--remote-count}{display=Packets to capture}{type=unsigned}{default=0}{tooltip=The number of remote packets to capture. (Default: inf)}{group=Capture} arg {number=13}{call=--log-level}{display=Set the log level}{type=selector}{tooltip=Set the log level}{required=false}{group=Debug} value {arg=13}{value=message}{display=Message}{default=true} value {arg=13}{value=info}{display=Info} value {arg=13}{value=debug}{display=Debug} value {arg=13}{value=noisy}{display=Noisy} arg {number=14}{call=--log-file}{display=Use a file for logging}{type=fileselect}{tooltip=Set a file where log messages are written}{required=false}{group=Debug}
To capture:
sshdig --extcap-interface=sshdig --fifo=/tmp/ssh.scap --capture --remote-host 192.168.1.10 --remote-username user
Note
CTRL + C should be used to stop the capture in order to ensure clean termination.
The sshdig binary can be renamed to support multiple instances. For instance if we want sshdig to show up twice in Stratoshark (for instance to handle multiple profiles), we can copy sshdig to sshdig-host1 and sshdig-host2. Each binary will show up an interface name same as the executable name. Those executables not being "sshdig" will show up as "custom version" in the capture source description.
SEE ALSO
stratoshark(1), strato(1), dumpcap(1), extcap(4)
NOTES
Sshdig is part of the Stratoshark distribution. The latest version of Stratoshark can be found at https://www.wireshark.org.
HTML versions of the Stratoshark project man pages are available at https://www.wireshark.org/docs/man-pages.
AUTHORS
Original Author
Dario Lombardo <lomato[AT]gmail.com>
2025-10-08 |