local rpc = require "rpc" local shortport = require "shortport" local stdnse = require "stdnse" local string = require "string" local tab = require "tab" local table = require "table" description = [[ Retrieves disk space statistics and information from a remote NFS share. The output is intended to resemble the output of df. The script will provide pathconf information of the remote NFS if the version used is NFSv3. ]] --- -- @output -- PORT STATE SERVICE -- | nfs-statfs: -- | Filesystem 1K-blocks Used Available Use% Blocksize -- | /mnt/nfs/files 5542276 2732012 2528728 52% 4096 -- |_ /mnt/nfs/opensource 5534416 620640 4632644 12% 4096 -- -- @args nfs-statfs.human If set to 1 or true, -- shows file sizes in a human readable format with suffixes like -- KB and MB. -- Version 0.3 -- Created 01/25/2010 - v0.1 - created by Patrik Karlsson -- Revised 02/22/2010 - v0.2 - adapted to support new RPC library -- Revised 03/13/2010 - v0.3 - converted host to port rule -- Revised 06/28/2010 - v0.4 - added NFSv3 support and doc author = "Patrik Karlsson, Djalal Harouni" license = "Same as Nmap--See http://nmap.org/book/man-legal.html" categories = {"discovery", "safe"} portrule = shortport.port_or_service(111, "rpcbind", {"tcp", "udp"} ) local function table_fsstat(nfs, mount, stats) local fs, err = rpc.Util.calc_fsstat_table(stats, nfs.version, nfs.human) if fs == nil then return false, err end fs.filesystem = string.format("%s", mount) return true, fs end local function table_fsinfo(nfs, fsinfo) local ret = {} local fs, err = rpc.Util.calc_fsinfo_table(fsinfo, nfs.version, nfs.human) if fs == nil then return false, err end ret.maxfilesize = fs.maxfilesize return true, ret end local function table_pathconf(nfs, pconf) local ret = {} local fs, err = rpc.Util.calc_pathconf_table(pconf, nfs.version) if fs == nil then return false, err end ret.linkmax = fs.linkmax return true, ret end local function report(nfs, tables) local outtab, tab_size, tab_avail local tab_filesys, tab_used, tab_use, tab_bs, tab_maxfs, tab_linkmax = "Filesystem", "Used", "Use%", "Blocksize", "Maxfilesize", "Maxlink" if nfs.human then tab_size = "Size" tab_avail = "Avail" else tab_size = "1K-blocks" tab_avail = "Available" end if nfs.version == 2 then outtab = tab.new() tab.addrow(outtab, tab_filesys, tab_size, tab_used, tab_avail, tab_use, tab_bs) for _, t in ipairs(tables) do tab.addrow(outtab, t.filesystem, t.size, t.used, t.available, t.use, t.bsize) end elseif nfs.version == 3 then outtab = tab.new() tab.addrow(outtab, tab_filesys, tab_size, tab_used, tab_avail, tab_use, tab_maxfs, tab_linkmax) for _, t in ipairs(tables) do tab.addrow(outtab, t.filesystem, t.size, t.used, t.available, t.use, t.maxfilesize, t.linkmax) end end return tab.dump(outtab) end local function nfs_filesystem_info(nfs, mount, filesystem) local results, res, status = {}, {} local nfsobj = rpc.NFS:new() local mnt_comm, nfs_comm, fhandle mnt_comm, fhandle = rpc.Helper.MountPath(nfs.host, nfs.port, mount) if mnt_comm == nil then return false, fhandle end local nfs_comm, status = rpc.Helper.NfsOpen(nfs.host, nfs.port) if nfs_comm == nil then rpc.Helper.UnmountPath(mnt_comm, mount) return false, status end nfs.version = nfs_comm.version -- use simple check since NFSv1 is not used anymore. if (mnt_comm.version ~= nfs_comm.version) then rpc.Helper.UnmountPath(mnt_comm, mount) return false, string.format("versions mismatch, nfs v%d - mount v%d", nfs_comm.version, mnt_comm.version) end if nfs_comm.version < 3 then status, res = nfsobj:StatFs(nfs_comm, fhandle) elseif nfs_comm.version == 3 then status, res = nfsobj:FsStat(nfs_comm, fhandle) end if status then status, res = table_fsstat(nfs, mount, res) if status then for k, v in pairs(res) do results[k] = v end end if nfs_comm.version == 3 then status, res = nfsobj:FsInfo(nfs_comm, fhandle) if status then status, res = table_fsinfo(nfs, res) if status then for k, v in pairs(res) do results[k] = v end end end status, res = nfsobj:PathConf(nfs_comm, fhandle) if status then status, res = table_pathconf(nfs, res) if status then for k, v in pairs(res) do results[k] = v end end end end end rpc.Helper.NfsClose(nfs_comm) rpc.Helper.UnmountPath(mnt_comm, mount) if (not(status)) then return status, res end table.insert(filesystem, results) return true, nil end action = function(host, port) local fs_info, mounts, status = {}, {}, {} local nfs_info = { host = host, port = port, } nfs_info.human = stdnse.get_script_args('nfs-statfs.human') status, mounts = rpc.Helper.ShowMounts( host, port ) if (not(status)) then return stdnse.format_output(false, mounts) end for _, v in ipairs(mounts) do local err status, err = nfs_filesystem_info(nfs_info, v.name, fs_info) if (not(status)) then return stdnse.format_output(false, string.format("%s: %s", v.name, err)) end end return stdnse.format_output(true, report(nfs_info, fs_info)) end