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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙ--- -- Functions for the SSH-1 protocol. This module also contains functions for -- formatting key fingerprints. -- -- @author Sven Klemm -- @copyright Same as Nmap--See https://nmap.org/book/man-legal.html local io = require "io" local math = require "math" local nmap = require "nmap" local os = require "os" local stdnse = require "stdnse" local string = require "string" local stringaux = require "stringaux" local table = require "table" local base64 = require "base64" local openssl = stdnse.silent_require "openssl" _ENV = stdnse.module("ssh1", stdnse.seeall) --- Retrieve the size of the packet that is being received -- and checks if it is fully received -- -- This function is very similar to the function generated -- with match.numbytes(num) function, except that this one -- will check for the number of bytes on-the-fly, based on -- the written on the SSH packet. -- -- @param buffer The receive buffer -- @return packet_length, packet_length or nil -- the return is similar to the lua function string:find() check_packet_length = function( buffer ) if #buffer < 4 then return nil end local payload_length = string.unpack( ">I4", buffer ) local padding = 8 - payload_length % 8 assert(payload_length) local total = 4+payload_length+padding; if total > #buffer then return nil end return total, total; end --- Receives a complete SSH packet, even if fragmented -- -- This function is an abstraction layer to deal with -- checking the packet size to know if there is any more -- data to receive. -- -- @param socket The socket used to receive the data -- @return status True or false -- @return packet The packet received receive_ssh_packet = function( socket ) local status, packet = socket:receive_buf(check_packet_length, true) return status, packet end local function unpack_with_padding(len_bytes, data, offset) local length, offset = string.unpack( ">I".. len_bytes, data, offset ) return string.unpack( ">c" .. math.ceil( length / 8 ), data, offset ) end --- Fetch an SSH-1 host key. -- @param host Nmap host table. -- @param port Nmap port table. -- @return A table with the following fields: exp, -- mod, bits, key_type, -- fp_input, full_key, algorithm, and -- fingerprint. fetch_host_key = function(host, port) local socket = nmap.new_socket() local status, _ status = socket:connect(host, port) if not status then return end -- fetch banner status = socket:receive_lines(1) if not status then socket:close(); return end -- send our banner status = socket:send("SSH-1.5-Nmap-SSH1-Hostkey\r\n") if not status then socket:close(); return end local data, packet_length, padding, offset status,data = receive_ssh_packet( socket ) socket:close() if not status then return end packet_length, offset = string.unpack( ">I4", data ) padding = 8 - packet_length % 8 offset = offset + padding if padding + packet_length + 4 == #data then -- seems to be a proper SSH1 packet local msg_code,host_key_bits,exp,mod,length,fp_input msg_code, offset = string.unpack( ">B", data, offset ) if msg_code == 2 then -- 2 => SSH_SMSG_PUBLIC_KEY -- ignore cookie and server key bits offset = offset + 8 + 4 -- skip server key exponent and modulus _, offset = unpack_with_padding(2, data, offset) _, offset = unpack_with_padding(2, data, offset) host_key_bits, offset = string.unpack( ">I4", data, offset ) exp, offset = unpack_with_padding(2, data, offset) exp = openssl.bignum_bin2bn( exp ) mod, offset = unpack_with_padding(2, data, offset) mod = openssl.bignum_bin2bn( mod ) fp_input = mod:tobin()..exp:tobin() return {exp=exp,mod=mod,bits=host_key_bits,key_type='rsa1',fp_input=fp_input, full_key=('%d %s %s'):format(host_key_bits, exp:todec(), mod:todec()), key=('%s %s'):format(exp:todec(), mod:todec()), algorithm="RSA1", fingerprint=openssl.md5(fp_input), fp_sha256=openssl.digest("sha256",fp_input)} end end end --- Format a key fingerprint in hexadecimal. -- @param fingerprint Key fingerprint. -- @param algorithm Key algorithm. -- @param bits Key size in bits. fingerprint_hex = function( fingerprint, algorithm, bits ) fingerprint = stdnse.tohex(fingerprint,{separator=":",group=2}) return ("%d %s (%s)"):format( bits, fingerprint, algorithm ) end --- Format a key fingerprint in base64. -- @param fingerprint Key fingerprint. -- @param hash The hashing algorithm used -- @param algorithm Key algorithm. -- @param bits Key size in bits. fingerprint_base64 = function( fingerprint, hash, algorithm, bits ) fingerprint = base64.enc(fingerprint) return ("%d %s:%s (%s)"):format( bits, hash, fingerprint:match("[^=]+"), algorithm ) end --- Format a key fingerprint in Bubble Babble. -- @param fingerprint Key fingerprint. -- @param algorithm Key algorithm. -- @param bits Key size in bits. fingerprint_bubblebabble = function( fingerprint, algorithm, bits ) local vowels = {'a','e','i','o','u','y'} local consonants = {'b','c','d','f','g','h','k','l','m','n','p','r','s','t','v','z','x'} local s = "x" local seed = 1 for i=1,#fingerprint+2,2 do local in1,in2,idx1,idx2,idx3,idx4,idx5 if i < #fingerprint or #fingerprint / 2 % 2 ~= 0 then in1 = fingerprint:byte(i) idx1 = (((in1 >> 6) & 3) + seed) % 6 + 1 idx2 = ((in1 >> 2) & 15) + 1 idx3 = ((in1 & 3) + math.floor(seed/6)) % 6 + 1 s = s .. vowels[idx1] .. consonants[idx2] .. vowels[idx3] if i < #fingerprint then in2 = fingerprint:byte(i+1) idx4 = ((in2 >> 4) & 15) + 1 idx5 = (in2 & 15) + 1 s = s .. consonants[idx4] .. '-' .. consonants[idx5] seed = (seed * 5 + in1 * 7 + in2) % 36 end else idx1 = seed % 6 + 1 idx2 = 16 + 1 idx3 = math.floor(seed/6) + 1 s = s .. vowels[idx1] .. consonants[idx2] .. vowels[idx3] end end s = s .. 'x' return ("%d %s (%s)"):format( bits, s, algorithm ) end --- Format a key fingerprint into a visual ASCII art representation. -- -- Ported from http://www.openbsd.org/cgi-bin/cvsweb/~checkout~/src/usr.bin/ssh/key.c. -- @param fingerprint Key fingerprint. -- @param algorithm Key algorithm. -- @param bits Key size in bits. fingerprint_visual = function( fingerprint, algorithm, bits ) local i,j,field,characters,input,fieldsize_x,fieldsize_y,s fieldsize_x, fieldsize_y = 17, 9 characters = {' ','.','o','+','=','*','B','O','X','@','%','&','#','/','^','S','E'} -- initialize drawing area field = {} for i=1,fieldsize_x do field[i]={} for j=1,fieldsize_y do field[i][j]=1 end end -- we start in the center and mark it local x, y = math.ceil(fieldsize_x/2), math.ceil(fieldsize_y/2) field[x][y] = #characters - 1; -- iterate over fingerprint for i=1,#fingerprint do input = fingerprint:byte(i) -- each byte conveys four 2-bit move commands for j=1,4 do if (input & 1) == 1 then x = x + 1 else x = x - 1 end if (input & 2) == 2 then y = y + 1 else y = y - 1 end x = math.max(x,1); x = math.min(x,fieldsize_x) y = math.max(y,1); y = math.min(y,fieldsize_y) if field[x][y] < #characters - 2 then field[x][y] = field[x][y] + 1 end input = input >> 2 end end -- mark end point field[x][y] = #characters; -- build output s = ('\n+--[%4s %4d]----+\n'):format( algorithm, bits ) for i=1,fieldsize_y do s = s .. '|' for j=1,fieldsize_x do s = s .. characters[ field[j][i] ] end s = s .. '|\n' end s = s .. '+-----------------+\n' return s end -- A lazy parsing function for known_hosts_file. -- The script checks for the known_hosts file in this order: -- -- (1) If known_hosts is specified in a script arg, use that. If turned -- off (false), then don't do any known_hosts checking. -- (2) Look at ~/.ssh/config to see if user known_hosts is in an -- alternate location*. Look for "UserKnownHostsFile". If -- UserKnownHostsFile is specified, open that known_hosts. -- (3) Otherwise, open ~/.ssh/known_hosts. parse_known_hosts_file = function(path) local common_paths = {} local f, knownhostspath if path and io.open(path) then knownhostspath = path end if not knownhostspath then for l in io.lines(os.getenv("HOME") .. "/.ssh/config") do if l and string.find(l, "UserKnownHostsFile") then knownhostspath = string.match(l, "UserKnownHostsFile%s(.*)") if string.sub(knownhostspath,1,1)=="~" then knownhostspath = os.getenv("HOME") .. string.sub(knownhostspath, 2) end end end end if not knownhostspath then knownhostspath = os.getenv("HOME") .."/.ssh/known_hosts" end if not knownhostspath then return end local known_host_entries = {} local lnumber = 0 for l in io.lines(knownhostspath) do lnumber = lnumber + 1 if l and string.sub(l, 1, 1) ~= "#" then local parts = stringaux.strsplit(" ", l) table.insert(known_host_entries, {entry=parts, linenumber=lnumber}) end end return known_host_entries end return _ENV;