NAME¶

sshdump - Provide interfaces to capture from a remote host through SSH using a remote capture binary.

SYNOPSIS¶

sshdump [ --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=<public key path<gt ]> [ --remote-interface=<interface> ] [ --remote-capture-command=<capture command> ]

sshdump --extcap-interfaces

sshdump --extcap-interface=<interface> --extcap-dlts

sshdump --extcap-interface=<interface> --extcap-config

sshdump --extcap-interface=<interface> --fifo=<path to file or pipe> --capture --remote-host=myremotehost --remote-port=22 --remote-username=user --remote-interface=eth2 --remote-capture-command='tcpdump -U -i eth0 -w-'

DESCRIPTION¶

Sshdump is a extcap tool that allows one to run a remote capture tool in a SSH connection. The requirement is that the capture executable must have the capabilities to capture from the wanted interface.

The feature is functionally equivalent to run commands like

$ ssh remoteuser@remotehost -p 22222 'tcpdump -U -i IFACE -w -' > FILE & $ wireshark FILE

$ ssh remoteuser@remotehost '/sbin/dumpcap -i IFACE -P -w - -f "not port 22"' > FILE & $ wireshark FILE

Supported interfaces:

1. ssh

OPTIONS¶

--help

Print program arguments.

--version

Print program version.

--extcap-interfaces

List available interfaces.

--extcap-interface=<interface>

Use specified interfaces.

--extcap-dlts

List DLTs of specified interface.

--extcap-config

List configuration options of specified interface.

--capture

Start capturing from specified interface and write raw packet data to the location specified by --fifo.

--fifo=<path to file or pipe>

Save captured packet to file or send it through pipe.

--remote-host=<remote host>

The address of the remote host for capture.

--remote-port=<remote port>

The SSH port of the remote host.

--remote-username=<username>

The username for ssh authentication.

--remote-password=<password>

The password to use (if not ssh-agent and pubkey are used). WARNING: the passwords are stored in plaintext and visible to all users on this system. It is recommended to use keyfiles with a SSH agent.

--sshkey=<SSH private key path>

The path to a private key for authentication.

--remote-interface=<remote interface>

The remote network interface to capture from.

--remote-capture-command=<capture command>

A custom remote capture command that produces the remote stream that is shown in Wireshark. The command must be able to produce a PCAP stream written to STDOUT. See below for more examples.

--extcap-capture-filter=<capture filter>

The capture filter

EXAMPLES¶

To see program arguments:

    sshdump --help

To see program version:

    sshdump --version

To see interfaces:

    sshdump --extcap-interfaces

Only one interface (ssh) is supported.

  Output:
    interface {value=ssh}{display=SSH remote capture}

To see interface DLTs:

    sshdump --extcap-interface=ssh --extcap-dlts
  Output:
    dlt {number=147}{name=ssh}{display=Remote capture dependent DLT}

To see interface configuration options:

    sshdump --extcap-interface=ssh --extcap-config
  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}
    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}
    arg {number=2}{call=--remote-username}{display=Remote SSH server username}{type=string}
        {default=myusername}{tooltip=The remote SSH username. If not provided, the current user will be used}
    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.}
    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}
    arg {number=5}{call=--sshkey-passphrase}{display=SSH key passphrase}
        {type=string}{tooltip=Passphrase to unlock the SSH private key}
    arg {number=6}{call=--remote-interface}{display=Remote interface}{type=string}{default=eth0}
        {tooltip=The remote network interface used for capture}
    arg {number=7}{call=--remote-capture-command}{display=Remote capture command}{type=string}
        {tooltip=The remote command used to capture.}
    arg {number=8}{call=--remote-filter}{display=Remote capture filter}{type=string}
        {default=not ((host myip) and port 22)}{tooltip=The remote capture filter}
    arg {number=9}{call=--remote-count}{display=Packets to capture}{type=unsigned}{default=0}
        {tooltip=The number of remote packets to capture. (Default: unlimited)}

To capture:

    sshdump --extcap-interface=ssh --fifo=/tmp/ssh.pcap --capture --remote-host 192.168.1.10
    --remote-username user --remote-filter "not port 22"

To use different capture binaries:

    sshdump --extcap-interface=ssh --fifo=/tmp/ssh.pcap --capture --remote-host 192.168.1.10
    --remote-capture-command='dumpcap -i eth0 -P -w -'
    sshdump --extcap-interface=ssh --fifo=/tmp/ssh.pcap --capture --remote-host 192.168.1.10
    --remote-capture-command='sudo tcpdump -i eth0 -U -w -'

NOTE: To stop capturing CTRL+C/kill/terminate application.

SEE ALSO¶

wireshark(1), tshark(1), dumpcap(1), extcap(4), tcpdump(1)

NOTES¶

Sshdump is part of the Wireshark distribution. The latest version of Wireshark can be found at <https://www.wireshark.org>.

HTML versions of the Wireshark project man pages are available at: <https://www.wireshark.org/docs/man-pages>.

AUTHORS¶

  Original Author
  -------- ------
  Dario Lombardo             <lomato[AT]gmail.com>