mirror of
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109 lines
4.1 KiB
Lua
109 lines
4.1 KiB
Lua
description = [[
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Shows SSH hostkeys.
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Shows the target SSH server's key fingerprint and (with high enough verbosity level) the public key itself. It records the discovered host keys in <code>nmap.registry</code> for use by other scripts. Output can be controlled with the <code>ssh_hostkey</code> script argument.
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]]
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---
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--@usage
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-- nmap host --script SSH-hostkey --script-args ssh_hostkey=full
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-- nmap host --script SSH-hostkey --script-args ssh_hostkey=all
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-- nmap host --script SSH-hostkey --script-args ssh_hostkey='visual bubble'
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--
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--@args ssh_hostkey Controls the output format of keys. Multiple values may be
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-- given, separated by spaces. Possible values are
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-- * <code>"full"</code>: The entire key, not just the fingerprint.
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-- * <code>"bubble"</code>: Bubble Babble output,
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-- * <code>"visual"</code>: Visual ASCII art representation.
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-- * <code>"all"</code>: All of the above.
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--
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--@output
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-- 22/tcp open ssh
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-- | ssh-hostkey: 2048 f0:58:ce:f4:aa:a4:59:1c:8e:dd:4d:07:44:c8:25:11 (RSA)
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-- 22/tcp open ssh
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-- | ssh-hostkey: 2048 f0:58:ce:f4:aa:a4:59:1c:8e:dd:4d:07:44:c8:25:11 (RSA)
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-- | +--[ RSA 2048]----+
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-- | | .E*+ |
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-- | | oo |
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-- | | . o . |
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-- | | O . . |
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-- | | o S o . |
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-- | | = o + . |
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-- | | . * o . |
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-- | | = . |
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-- | | o . |
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-- |_ +-----------------+
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-- 22/tcp open ssh
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-- | ssh-hostkey: 2048 xuvah-degyp-nabus-zegah-hebur-nopig-bubig-difeg-hisym-rumef-cuxex (RSA)
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-- |_ ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAwVuv2gcr0maaKQ69VVIEv2ob4OxnuI64fkeOnCXD1lUx5tTA+vefXUWEMxgMuA7iX4irJHy2zer0NQ3Z3yJvr5scPgTYIaEOp5Uo/eGFG9Agpk5wE8CoF0e47iCAPHqzlmP2V7aNURLMODb3jVZuI07A2ZRrMGrD8d888E2ORVORv1rYeTYCqcMMoVFmX9l3gWEdk4yx3w5sD8v501Iuyd1v19mPfyhrI5E1E1nl/Xjp5N0/xP2GUBrdkDMxKaxqTPMie/f0dXBUPQQN697a5q+5lBRPhKYOtn6yQKCd9s1Q22nxn72Jmi1RzbMyYJ52FosDT755Qmb46GLrDMaZMQ==
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author = "Sven Klemm"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"safe","default","intrusive"}
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require("shortport")
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require("stdnse")
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-- openssl is required for this script
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if pcall(require,"openssl") then
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require("ssh1")
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require("ssh2")
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else
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portrule = function() return false end
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action = function() end
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stdnse.print_debug( 3, "Skipping %s script because OpenSSL is missing.", filename )
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return;
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end
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portrule = shortport.port_or_service(22, "ssh")
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--- put hostkey in the nmap registry for usage by other scripts
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--@param host nmap host table
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--@param key host key table
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local add_key_to_registry = function( host, key )
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nmap.registry.sshhostkey = nmap.registry.sshhostkey or {}
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nmap.registry.sshhostkey[host.ip] = nmap.registry.sshhostkey[host.ip] or {}
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table.insert( nmap.registry.sshhostkey[host.ip], key )
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end
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action = function(host, port)
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local output = {}
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local keys = {}
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local _,key
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local format = nmap.registry.args.ssh_hostkey or "hex"
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local all_formats = format:find( 'all', 1, true )
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key = ssh1.fetch_host_key( host, port )
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if key then table.insert( keys, key ) end
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key = ssh2.fetch_host_key( host, port, "ssh-dss" )
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if key then table.insert( keys, key ) end
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key = ssh2.fetch_host_key( host, port, "ssh-rsa" )
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if key then table.insert( keys, key ) end
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for _, key in ipairs( keys ) do
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add_key_to_registry( host, key )
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if format:find( 'hex', 1, true ) or all_formats then
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table.insert( output, ssh1.fingerprint_hex( key.fingerprint, key.algorithm, key.bits ) )
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end
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if format:find( 'bubble', 1, true ) or all_formats then
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table.insert( output, ssh1.fingerprint_bubblebabble( openssl.sha1(key.fp_input), key.algorithm, key.bits ) )
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end
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if format:find( 'visual', 1, true ) or all_formats then
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-- insert empty line so table is not destroyed if this is the first
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-- line of output
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if #output == 0 then table.insert( output, " " ) end
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table.insert( output, ssh1.fingerprint_visual( key.fingerprint, key.algorithm, key.bits ) )
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end
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if nmap.verbosity() > 1 or format:find( 'full', 1, true ) or all_formats then
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table.insert( output, key.full_key )
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end
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end
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if #output > 0 then
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return table.concat( output, '\n' )
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end
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end
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