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378 lines
12 KiB
include::../docbook/attributes.adoc[]
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= sshdump(1)
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:doctype: manpage
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:stylesheet: ws.css
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:linkcss:
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:copycss: ../docbook/{stylesheet}
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== NAME
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sshdump - Provide interfaces to capture from a remote host through SSH using a remote capture binary.
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== SYNOPSIS
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[manarg]
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*sshdump*
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[ *--help* ]
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[ *--version* ]
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[ *--extcap-interfaces* ]
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[ *--extcap-dlts* ]
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[ *--extcap-interface*=<interface> ]
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[ *--extcap-config* ]
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[ *--extcap-capture-filter*=<capture filter> ]
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[ *--capture* ]
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[ *--fifo*=<path to file or pipe> ]
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[ *--remote-host*=<IP address> ]
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[ *--remote-port*=<TCP port> ]
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[ *--remote-username*=<username> ]
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[ *--remote-password*=<password> ]
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[ *--sshkey*=<private key path> ]
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[ *--sshkey-passphrase*=<private key passphrase> ]
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[ *--proxycommand*=<SSH proxy command> ]
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[ *--remote-interface*=<interface> ]
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[ *--remote-capture-command-select*=<capture command selection> ]
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[ *--remote-capture-command*=<capture command> ]
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[ *--remote-priv*=<privilege elevation command selection> ]
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[ *--remote-priv-user*=<privileged user name> ]
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[ *--remote-noprom* ]
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[ *--remote-filter*=<remote capture filter> ]
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[ *--remote-count*=<number> ]
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[manarg]
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*sshdump*
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*--extcap-interfaces*
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[manarg]
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*sshdump*
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*--extcap-interface*=<interface>
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*--extcap-dlts*
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[manarg]
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*sshdump*
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*--extcap-interface*=<interface>
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*--extcap-config*
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[manarg]
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*sshdump*
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*--extcap-interface*=<interface>
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*--fifo*=<path to file or pipe>
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*--capture*
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*--remote-host=myremotehost*
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*--remote-port=22*
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*--remote-username=user*
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*--remote-interface=eth2*
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*--remote-capture-command='tcpdump -U -i eth0 -w-'*
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== DESCRIPTION
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*Sshdump* is an extcap tool that allows one to run a remote capture
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tool over a SSH connection. The requirement is that the capture
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executable must have the capabilities to capture from the wanted
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interface.
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The feature is functionally equivalent to run commands like
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$ ssh remoteuser@remotehost -p 22222 'tcpdump -U -i IFACE -w -' > FILE &
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$ wireshark FILE
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$ ssh remoteuser@remotehost '/sbin/dumpcap -i IFACE -P -w - -f "not port 22"' > FILE &
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$ wireshark FILE
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$ ssh somehost dumpcap -P -w - -f udp | tshark -i -
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Typically sshdump is not invoked directly. Instead it can be configured through
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the Wireshark graphical user interface or its command line. The following will
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start Wireshark and start capturing from host *remotehost*:
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$ wireshark '-oextcap.sshdump.remotehost:"remotehost"' -i sshdump -k
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To explicitly control the remote capture command:
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$ wireshark '-oextcap.sshdump.remotehost:"remotehost"' \
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'-oextcap.sshdump.remotecapturecommand:"tcpdump -i eth0 -Uw- not port 22"' \
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-i sshdump -k
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Supported interfaces:
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1. ssh
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== OPTIONS
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--help::
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+
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--
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Print program arguments.
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--
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--version::
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+
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--
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Print program version.
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--
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--extcap-interfaces::
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+
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--
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List available interfaces.
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--
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--extcap-interface=<interface>::
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+
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--
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Use specified interfaces.
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--
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--extcap-dlts::
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+
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--
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List DLTs of specified interface.
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--
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--extcap-config::
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+
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--
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List configuration options of specified interface.
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--
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--extcap-capture-filter=<capture filter>::
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+
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--
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The capture filter. It corresponds to the value provided via the *tshark -f*
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option, and the Capture Filter field next to the interfaces list in the
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Wireshark interface.
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--
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--capture::
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+
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--
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Start capturing from specified interface and write raw packet data to the location specified by --fifo.
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--
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--fifo=<path to file or pipe>::
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+
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--
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Save captured packet to file or send it through pipe.
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--
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--remote-host=<remote host>::
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+
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--
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The address of the remote host for capture.
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--
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--remote-port=<remote port>::
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--
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The SSH port of the remote host.
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--
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--remote-username=<username>::
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+
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--
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The username for SSH authentication.
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--
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--remote-password=<password>::
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+
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--
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The password to use (if not ssh-agent and pubkey are used). WARNING: the
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passwords are stored in plaintext and visible to all users on this system. It is
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recommended to use keyfiles with a SSH agent.
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--
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--sshkey=<SSH private key path>::
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+
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--
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The path to a private key for authentication. NOTE: Only OPENSSH key/value pair format is supported.
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--
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--sshkey-passphrase=<SSH private key passphrase>::
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--
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The passphrase for the private key for authentication.
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--
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--proxycommand=<proxy command>::
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+
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--
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The command to use as proxy for the SSH connection.
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--
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--remote-interface=<remote interface>::
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--
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The remote network interface to capture from.
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--
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--remote-capture-command-select=<capture command-selection>::
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+
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--
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The selection of the build-in support for remote capture commands. Either *dumpcap* for a remote
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capture command using dumpcap, *tcpdump* for a remote capture command using tcpdump, or *other*,
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where the remote capture command is to be given with the *--remote-capture-command* option.
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Note that selecting dumpcap allows for specifying multiple capture interfaces as a whitespace
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seperated list, while tcpdump does not.
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--
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--remote-capture-command=<capture command>::
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+
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--
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A custom remote capture command that produces the remote stream that is shown in Wireshark.
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The command must be able to produce a PCAP stream written to STDOUT. See below for more
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examples.
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If using tcpdump, use the *-w-* option to ensure that packets are written to
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standard output (stdout). Include the *-U* option to write packets as soon as
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they are received.
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When specified, this command will be used as is, options such as the capture
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filter (*--extcap-capture-filter*) will not be appended.
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--
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--remote-priv=<privilege elevation command selection>::
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+
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--
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The command to use to achieve privilege elevation to capture on the remote host. Either none, sudo or doas.
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--
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--remote-priv-user=<privileged user name>::
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+
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--
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If a command is used to achieve privilege elevation to capture on the remote host this may require a user name.
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If needed use this option to give that user name.
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--
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--remote-filter=<capture filter>::
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+
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--
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The remote capture filter. It corresponds to the value provided via the *tshark -f*
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option, and the Capture Filter field next to the interfaces list in the
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Wireshark interface.
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--
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--remote-count=<number>::
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+
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--
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The number of packets to capture.
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--
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== EXAMPLES
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To see program arguments:
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sshdump --help
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To see program version:
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sshdump --version
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To see interfaces:
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sshdump --extcap-interfaces
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Only one interface (sshdump) is supported.
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.Example output
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interface {value=sshdump}{display=SSH remote capture}
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To see interface DLTs:
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sshdump --extcap-interface=sshdump --extcap-dlts
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.Example output
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dlt {number=147}{name=sshdump}{display=Remote capture dependent DLT}
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To see interface configuration options:
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sshdump --extcap-interface=sshdump --extcap-config
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.Example output
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arg {number=0}{call=--remote-host}{display=Remote SSH server address}{type=string}
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{tooltip=The remote SSH host. It can be both an IP address or a hostname}{required=true}{group=Server}
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arg {number=1}{call=--remote-port}{display=Remote SSH server port}{type=unsigned}{default=22}
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{tooltip=The remote SSH host port (1-65535)}{range=1,65535}{group=Server}
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arg {number=2}{call=--remote-username}{display=Remote SSH server username}{type=string}
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{tooltip=The remote SSH username. If not provided, the current user will be used}{group=Authentication}
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arg {number=3}{call=--remote-password}{display=Remote SSH server password}{type=password}
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{tooltip=The SSH password, used when other methods (SSH agent or key files) are unavailable.}{group=Authentication}
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arg {number=4}{call=--sshkey}{display=Path to SSH private key}{type=fileselect}
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{tooltip=The path on the local filesystem of the private SSH key (OpenSSH format)}{mustexist=true}{group=Authentication}
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arg {number=5}{call=--sshkey-passphrase}{display=SSH key passphrase}{type=password}
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{tooltip=Passphrase to unlock the SSH private key}{group=Authentication}
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arg {number=6}{call=--proxycommand}{display=ProxyCommand}{type=string}
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{tooltip=The command to use as proxy for the SSH connection}{group=Authentication}
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arg {number=7}{call=--remote-interface}{display=Remote interface}{type=string}
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{tooltip=The remote network interface used for capture}{group=Capture}
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arg {number=8}{call=--remote-capture-command-select}{display=Remote capture command selection}{type=radio}
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{tooltip=The remote capture command to build a command line for}{group=Capture}
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value {arg=8}{value=dumpcap}{display=dumpcap}
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value {arg=8}{value=tcpdump}{display=tcpdump}{default=true}
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value {arg=8}{value=other}{display=Other:}
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arg {number=9}{call=--remote-capture-command}{display=Remote capture command}{type=string}
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{tooltip=The remote command used to capture}{group=Capture}
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arg {number=10}{call=--remote-priv}{display=Gain capture privilege on the remote machine}{type=radio}
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{tooltip=Optionally prepend the capture command with sudo or doas on the remote machine}{group=Capture}
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value {arg=10}{value=none}{display=none}{default=true}
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value {arg=10}{value=sudo}{display=sudo}
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value {arg=10}{value=doas -n}{display=doas}
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arg {number=11}{call=--remote-priv-user}{display=Privileged user name for sudo or doas}{type=string}
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{tooltip=User name of privileged user to execute the capture command on the remote machine}{group=Capture}
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arg {number=12}{call=--remote-noprom}{display=No promiscuous mode}{type=boolflag}
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{tooltip=Don't use promiscuous mode on the remote machine}{group=Capture}
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arg {number=13}{call=--remote-filter}{display=Remote capture filter}{type=string}
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{tooltip=The remote capture filter}{default=not ((host myhost) and port 22)}{group=Capture}
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arg {number=14}{call=--remote-count}{display=Packets to capture}{type=unsigned}{default=0}
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{tooltip=The number of remote packets to capture. (Default: inf)}{group=Capture}
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arg {number=15}{call=--log-level}{display=Set the log level}{type=selector}
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{tooltip=Set the log level}{required=false}{group=Debug}
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value {arg=14}{value=message}{display=Message}{default=true}
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value {arg=14}{value=info}{display=Info}
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value {arg=14}{value=debug}{display=Debug}
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value {arg=14}{value=noisy}{display=Noisy}
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arg {number=16}{call=--log-file}{display=Use a file for logging}{type=fileselect}
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{tooltip=Set a file where log messages are written}{required=false}{group=Debug}
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To capture:
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sshdump --extcap-interface=sshdump --fifo=/tmp/ssh.pcap --capture --remote-host 192.168.1.10
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--remote-username user --remote-filter "not port 22"
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To use different capture binaries:
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sshdump --extcap-interface=sshdump --fifo=/tmp/ssh.pcap --capture --remote-host 192.168.1.10
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--remote-username user --remote-priv sudo --remote-capture-command-select tcpdump
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--remote-interface eth0 --remote-noprom
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sshdump --extcap-interface=sshdump --fifo=/tmp/ssh.pcap --capture --remote-host 192.168.1.10
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--remote-capture-command='dumpcap -i eth0 -P -w -'
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sshdump --extcap-interface=sshdump --fifo=/tmp/ssh.pcap --capture --remote-host 192.168.1.10
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--remote-capture-command='sudo tcpdump -i eth0 -U -w -'
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NOTE: To stop capturing CTRL+C/kill/terminate the application.
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The sshdump binary can be renamed to support multiple instances. For instance if we want sshdump
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to show up twice in wireshark (for instance to handle multiple profiles), we can copy sshdump to
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sshdump-host1 and sshdump-host2. Each binary will show up an interface name same as the executable
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name. Those executables not being "sshdump" will show up as "custom version" in the interface description.
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== SEE ALSO
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xref:wireshark.html[wireshark](1), xref:tshark.html[tshark](1), xref:dumpcap.html[dumpcap](1), xref:extcap.html[extcap](4), xref:https://www.tcpdump.org/manpages/tcpdump.1.html[tcpdump](1)
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== NOTES
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*Sshdump* is part of the *Wireshark* distribution. The latest version
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of *Wireshark* can be found at https://www.wireshark.org.
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HTML versions of the Wireshark project man pages are available at
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https://www.wireshark.org/docs/man-pages.
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== AUTHORS
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.Original Author
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[%hardbreaks]
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Dario Lombardo <lomato[AT]gmail.com>
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