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o [NSE] Added RPC library and three new NFS scripts. Modified the rpcinfo and

nfs-showmount scripts to use the new library. The new scripts are:
  - nfs-acls shows the owner and directory mode of NFS exports
  - nfs-dirlist lists the contents of NFS exports
  - nfs-statfs shows file system statistics for NFS exports
  [Patrik]
This commit is contained in:
patrik
2010-03-21 17:56:17 +00:00
parent e72ecb11ac
commit dd9a237fe2
8 changed files with 1973 additions and 425 deletions

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@@ -2,6 +2,13 @@
[NOT YET RELEASED]
o [NSE] Added RPC library and three new NFS scripts. Modified the rpcinfo and
nfs-showmount scripts to use the new library. The new scripts are:
- nfs-acls shows the owner and directory mode of NFS exports
- nfs-dirlist lists the contents of NFS exports
- nfs-statfs shows file system statistics for NFS exports
[Patrik]
o Fixed the Idle Scan (-sI) so that scanning multiple hosts doesn't
retest the zombie proxy and reinitialize all of the associated data
at the beginning of each run. [Kris]

1681
nselib/rpc.lua Normal file

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65
scripts/nfs-acls.nse Normal file
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@@ -0,0 +1,65 @@
description = [[
Shows NFS exports and access controls.
]]
---
-- @output
-- PORT STATE SERVICE
-- 111/tcp open rpcbind
-- | nfs-acls:
-- | /tmp
-- | uid: 0; gid: 0; mode: drwxrwxrwx (1777)
-- | /home/storage/backup
-- | uid: 0; gid: 0; mode: drwxr-xr-x (755)
-- | /home
-- |_ uid: 0; gid: 0; mode: drwxr-xr-x (755)
--
-- Version 0.6
-- Created 11/23/2009 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
-- Revised 11/24/2009 - v0.2 - added RPC query to find mountd ports
-- Revised 11/24/2009 - v0.3 - added a hostrule instead of portrule
-- Revised 11/26/2009 - v0.4 - reduced packet sizes and documented them
-- Revised 01/24/2009 - v0.5 - complete rewrite, moved all NFS related code into nselib/nfs.lua
-- Revised 02/22/2009 - v0.6 - adapted to support new RPC library
author = "Patrik Karlsson"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"discovery", "safe"}
require("shortport")
require("rpc")
portrule = shortport.port_or_service(111, "rpcbind", {"tcp", "udp"} )
action = function(host, port)
local status, mounts, attribs
local result = {}
status, mounts = rpc.Helper.ShowMounts( host, port )
if ( not(status) or mounts == nil ) then
return " \n\n Failed to list mount points"
end
for _, mount in ipairs( mounts ) do
local item = {}
status, attribs = rpc.Helper.GetAttributes( host, port, mount.name )
item.name = mount.name
if ( status ) then
table.insert(item, ("uid: %d; gid: %d; mode: %s (%d)"):format(attribs.uid, attribs.gid, rpc.Util.ToAclText( attribs.mode ), rpc.Util.ToAclMode( attribs.mode )) )
else
table.insert(item, "ERROR: Mount failed")
end
table.insert(result, item)
end
return stdnse.format_output( true, result )
end

86
scripts/nfs-dirlist.nse Normal file
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@@ -0,0 +1,86 @@
description = [[
Does a directory listing of a remote NFS share
]]
---
-- @output
-- PORT STATE SERVICE
-- 111/tcp open rpcbind
-- | nfs-dirlist:
-- | /home/storage/backup
-- | www.cqure.net
-- | /home
-- | admin
-- | lost+found
-- | patrik
-- | storage
-- |_ web
--
-- Version 0.3
--
-- Created 01/25/2010 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
-- Revised 02/22/2010 - v0.2 - adapted to support new RPC library
-- Revised 03/13/2010 - v0.3 - converted host to port rule
author = "Patrik Karlsson"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"discovery", "safe"}
require("shortport")
require("rpc")
portrule = shortport.port_or_service(111, "rpcbind", {"tcp", "udp"} )
action = function(host, port)
local status, mounts
local result, files = {}, {}
local hasmore = false
local proto
status, mounts = rpc.Helper.ShowMounts( host, port )
if ( not(status) ) then
return " \n\n Failed to list mount points"
end
for _, v in ipairs( mounts ) do
local files = {}
local status, dirlist = rpc.Helper.Dir(host, port, v.name)
if status and dirlist then
local max_files = tonumber(nmap.registry.args.nfs_max_files) or 10
hasmore = false
for _, v in ipairs( dirlist.entries ) do
if #files >= max_files then
hasmore = true
break
end
if v.name ~= ".." and v.name ~= "." then
table.insert(files, v.name)
end
end
table.sort(files)
if hasmore then
files.name = v.name .. string.format(" (Output limited to %d files)", max_files )
else
files.name = v.name
end
table.insert( result, files )
else
files.name = v.name
table.insert(files, "ERROR: Mount failed")
table.insert( result, files )
end
end
return stdnse.format_output( true, result )
end

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@@ -6,334 +6,48 @@ Shows NFS exports, like the <code>showmount -e</code> command.
-- @output
-- PORT STATE SERVICE
-- 111/tcp open rpcbind
--
-- Host script results:
-- | nfs-showmount:
-- | /home/storage/backup 10.46.200.0/255.255.255.0 10.46.200.66/255.255.255.255
-- |_ /home 10.46.200.0/255.255.255.0
-- | /home/storage/backup 10.46.200.0/255.255.255.0
-- |_ /home 1.2.3.4/255.255.255.255 10.46.200.0/255.255.255.0
--
-- Version 0.4
-- Version 0.7
-- Created 11/23/2009 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
-- Revised 11/24/2009 - v0.2 - added RPC query to find mountd ports
-- Revised 11/24/2009 - v0.3 - added a hostrule instead of portrule
-- Revised 11/26/2009 - v0.4 - reduced packet sizes and documented them
-- Revised 01/24/2009 - v0.5 - complete rewrite, moved all NFS related code into nselib/nfs.lua
-- Revised 02/22/2009 - v0.6 - adapted to support new RPC library
-- Revised 03/13/2010 - v0.7 - converted host to port rule
author = "Patrik Karlsson"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"discovery", "safe"}
require 'comm'
require 'datafiles'
require("shortport")
require("rpc")
hostrule = function(host)
portrule = shortport.port_or_service(111, "rpcbind", {"tcp", "udp"} )
local port_t111 = nmap.get_port_state(host, {number=111, protocol="udp"})
local port_u111 = nmap.get_port_state(host, {number=111, protocol="tcp"})
action = function(host, port)
return ( port_t111 ~= nil and port_t111.state == "open") or
(port_u111 ~= nil and (port_u111.state == "open" or
port_u111.state == "open|filtered"))
local status, mounts, proto
local result = {}
status, mounts = rpc.Helper.ShowMounts( host, port )
if not status or mounts == nil then
return " \n\n Failed to list mount points"
end
--
-- Calculates the number of fill bytes needed
-- @param length contains the length of the string
-- @return the amount of pad needed to be divideable by 4
--
function calc_fill_bytes(length)
-- calculate fill bytes
if math.mod( length, 4 ) ~= 0 then
return (4 - math.mod( length, 4))
else
return 0
for _, v in ipairs( mounts ) do
local entry = v.name
entry = entry .. " " .. stdnse.strjoin(" ", v)
table.insert( result, entry )
end
end
--
-- extracts the group from the export list entry
-- @param data string should be start with 32-bit lenght field
--
-- @return pos numeric new position within buffer, grp_val string the group contents
--
function extract_group(data)
local pos, grp_val
-- retrieve the group length
pos, grp_len = bin.unpack( ">i", data )
data = data:sub(pos)
-- retrieve the group contents
grp_val = data:sub(0, grp_len)
pos = 4 + calc_fill_bytes(grp_len) + grp_len + 1
return pos, grp_val
end
--
-- extracts the directory from the export list entry
-- @param data string should be start with 32-bit lenght field
--
-- @return pos numeric new position within buffer, dir_name string the name of the directory
--
function extract_directory(data)
local pos, dir_len, dir_name
-- retrieve the length of the directory name
pos, dir_len = bin.unpack(">i", data)
data = data:sub(pos)
-- retrieve the directory name
dir_name = data:sub(0, dir_len)
pos = 4 + calc_fill_bytes(dir_len) + dir_len + 1
return pos, dir_name
end
--
-- processes the response back from the mountd service
-- @param proto string should be either "udp" or "tcp"
-- @param data string contains the response recieved from the service
--
-- @return string with exports from NFS
--
function process_response(proto, data)
local pos, val_follows
local header = {}
local response=" \n"
-- if we're running over UDP skip first 4 bytes ( theres no 16-bit something + 16-bit length)
if "udp" == proto then
pos, header['xid'], header['type'], header['state'],
header['verifier'], header['accept_state'] = bin.unpack(">iiili", data)
else
pos, _, header['length'], header['xid'], header['type'], header['state'],
header['verifier'], header['accept_state'] = bin.unpack("S>Siiili", data)
end
data = data:sub(pos)
-- We should probably be doing a lot more verification here, but let's stick to basics
-- Was the response from the server = Reply(1) and
-- Accept state = RPC Executed succefully (0)
if header['type'] ~= 1 or header['accept_state'] ~= 0 then
return
end
--
--
-- Each export list entry consists of:
--
-- One or more Directory entries:
-- 32-bit - length
-- length - directory name
--
-- One or more Group entries:
-- 32-bit - length
-- length - group contents
--
-- Every group entry is separated by
-- 32-bit - value follows - if set to 1 more groups exist
--
-- Every directory entry is separated by
-- 32-bit - value follows - if set to 1 more entries exist
--
--
-- Note: The length specifies the amount of characters for
-- both dir and group entries
--
-- However, directories and groups are padded by zeroes so that
-- they are divideable by 4. Hence calc_fill_bytes
--
pos, val_follows = bin.unpack(">i", data)
data = data:sub(pos)
while 1 == val_follows do
local dir_name, exp_group
local grp_follows, grp_len, grp_val
groups=""
pos, dir_name = extract_directory( data )
data = data:sub(pos)
-- check if we have a group following
pos, grp_follows = bin.unpack(">i", data )
data = data:sub(pos)
while grp_follows == 1 do
pos, grp_val = extract_group( data )
groups = groups .. " " .. grp_val
data = data:sub(pos)
-- check if there's antoher group following
pos, grp_follows = bin.unpack(">i", data )
data = data:sub(pos)
end
-- concatenate our dir_name and groups to the result
response = response .. dir_name .. "" .. groups .. "\n"
-- are there any more directory entries?
pos, val_follows = bin.unpack(">i", data)
data = data:sub(pos)
end
return response
end
--
-- Ruthlessly ripped, and modified, from Sven Klemm's rpcinfo.nse script
--
function get_rpc_port_for_service(host, svc_progname, svc_version)
local socket = nmap.new_socket()
socket:set_timeout(1000)
local catch = function() socket:close() end
local try = nmap.new_try(catch)
local rpc_numbers = try(datafiles.parse_rpc())
try(socket:connect(host.ip, 111))
-- build rpc dump call packet
local transaction_id = math.random(0x7FFFFFFF)
local request = bin.pack('>IIIIIIILL',0x80000028,transaction_id,0,2,100000,2,4,0,0)
try(socket:send(request))
local answer = try(socket:receive_bytes(1))
local _,offset,header,length,tx_id,msg_type,reply_state,accept_state,value,payload,last_fragment
last_fragment = false; offset = 1; payload = ''
-- extract payload from answer and try to receive more packets if
-- RPC header with last_fragment set has not been received
-- If we can't get further packets don't stop but process what we
-- got so far.
while not last_fragment do
if offset > #answer then
local status, data = socket:receive_bytes(1)
if not status then break end
answer = answer .. data
end
offset,header = bin.unpack('>I',answer,offset)
last_fragment = bit.band( header, 0x80000000 ) ~= 0
length = bit.band( header, 0x7FFFFFFF )
payload = payload .. answer:sub( offset, offset + length - 1 )
offset = offset + length
end
socket:close()
offset,tx_id,msg_type,reply_state,_,_,accept_state = bin.unpack( '>IIIIII', payload )
-- transaction_id matches, message type reply, reply state accepted and accept state executed successfully
if tx_id == transaction_id and msg_type == 1 and reply_state == 0 and accept_state == 0 then
local dir = { udp = {}, tcp = {}}
local protocols = {[6]='tcp',[17]='udp'}
local prog, version, proto, port
local ports = {}
offset, value = bin.unpack('>I',payload,offset)
while value == 1 and #payload - offset >= 19 do
offset,prog,version,proto,port,value = bin.unpack('>IIIII',payload,offset)
proto = protocols[proto] or tostring( proto )
if rpc_numbers[prog] == svc_progname and version == svc_version then
ports[proto] = port
end
end
return ports
end
return
end
action = function(host)
local data = {}
-- packet copy/pasted from wireshark, running showmount -e
data["tcp"] = string.char(
0x80, 0x00, 0x00, 0x28, -- Fragment Length: 44 bytes (31-bit?)
-- Last Fragment: Yes
0x21, 0x00, 0x46, 0x4c, -- XID: 0x2100464c
0x00, 0x00, 0x00, 0x00, -- Message type: Call(0)
0x00, 0x00, 0x00, 0x02, -- RPC Version: 2
0x00, 0x01, 0x86, 0xa5, -- Program: MOUNT(100005)
0x00, 0x00, 0x00, 0x01, -- Program Version: 1
0x00, 0x00, 0x00, 0x05, -- Procedure: EXPORT(5)
-- Credentials
0x00, 0x00, 0x00, 0x00, -- Flavor: AUTH_NULL (0)
0x00, 0x00, 0x00, 0x00, -- Length: 0
-- Verifier
0x00, 0x00, 0x00, 0x00, -- Flavor: AUTH_NULL
0x00, 0x00, 0x00, 0x00 -- Length: 0
)
data["udp"] = string.char(
0x21, 0x00, 0x46, 0x4c, -- XID: 0x2100464c
0x00, 0x00, 0x00, 0x00, -- Message type: Call(0)
0x00, 0x00, 0x00, 0x02, -- RPC Version: 2
0x00, 0x01, 0x86, 0xa5, -- Program: MOUNT(100005)
0x00, 0x00, 0x00, 0x01, -- Program Version: 1
0x00, 0x00, 0x00, 0x05, -- Procedure: EXPORT(5)
-- Credentials
0x00, 0x00, 0x00, 0x00, -- Flavor: AUTH_NULL (0)
0x00, 0x00, 0x00, 0x00, -- Length: 0
-- Verifier
0x00, 0x00, 0x00, 0x00, -- Flavor: AUTH_NULL
0x00, 0x00, 0x00, 0x00 -- Length: 0
)
local status, result
local ports = get_rpc_port_for_service(host, "mountd", 1)
for p in pairs(ports) do
status, result = comm.exchange(host, ports[p], data[p], {proto=p})
-- Fail gracefully
if not status then
if (nmap.verbosity() >= 2 or nmap.debugging() >= 1) then
return "ERROR: TIMEOUT"
else
return
end
end
result = process_response( p, result )
if result then
return result
end
end
return
return stdnse.format_output( true, result )
end

69
scripts/nfs-statfs.nse Normal file
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@@ -0,0 +1,69 @@
description = [[
Retrieves disk space statistics from the remote NFS share
]]
---
-- @output
-- PORT STATE SERVICE
-- | nfs-statfs:
-- | /home/storage/backup
-- | Block size: 512
-- | Total blocks: 1901338728
-- | Free blocks: 729769328
-- | Available blocks: 633186880
-- | /home
-- | Block size: 512
-- | Total blocks: 1901338728
-- | Free blocks: 729769328
-- |_ Available blocks: 633186880
--
-- Version 0.3
-- Created 01/25/2010 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
-- Revised 02/22/2010 - v0.2 - adapted to support new RPC library
-- Revised 03/13/2010 - v0.3 - converted host to port rule
author = "Patrik Karlsson"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"discovery", "safe"}
require("shortport")
require("rpc")
portrule = shortport.port_or_service(111, "rpcbind", {"tcp", "udp"} )
action = function(host, port)
local result, entry = {}, {}
local status, mounts = rpc.Helper.ShowMounts( host, port )
if ( not(status) ) then
return " \n\n Failed to list mount points"
end
for _, v in ipairs( mounts ) do
local entry = {}
local status, stats = rpc.Helper.ExportStats(host, port, v.name)
if ( not(status) and stats:match("Version %d not supported") ) then
return " \n\n " .. stats
end
entry.name = v.name
if status and stats then
table.insert( entry, string.format("Block size: %d", stats.block_size) )
table.insert( entry, string.format("Total blocks: %d", stats.total_blocks) )
table.insert( entry, string.format("Free blocks: %d", stats.free_blocks) )
table.insert( entry, string.format("Available blocks: %d", stats.available_blocks) )
else
table.insert( entry, "ERROR: Mount failed")
end
table.insert( result, entry )
end
return stdnse.format_output( true, result )
end

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@@ -4,122 +4,43 @@ Connects to portmapper and fetches a list of all registered programs.
---
-- @output
-- PORT STATE SERVICE
-- 111/tcp open rpcbind
-- | rpcinfo:
-- | 100000 2 111/udp rpcbind
-- | 100005 1,2,3 705/udp mountd
-- | 100003 2,3,4 2049/udp nfs
-- | 100024 1 32769/udp status
-- | 100021 1,3,4 32769/udp nlockmgr
-- | 100000 2 111/tcp rpcbind
-- | 100005 1,2,3 706/tcp mountd
-- | 100003 2,3,4 2049/tcp nfs
-- | 100024 1 50468/tcp status
-- |_ 100021 1,3,4 50468/tcp nlockmgr
-- | 100000 2 111/udp rpcbind
-- | 100003 2 2049/tcp nfs
-- | 100003 2 2049/udp nfs
-- | 100005 1,2 953/udp mountd
-- | 100005 1,2 956/tcp mountd
-- | 100024 1 55145/tcp status
-- |_ 100024 1 59421/udp status
require "shortport"
require "datafiles"
require "bin"
require "bit"
require "tab"
author = "Sven Klemm"
author = "Patrik Karlsson"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"default","safe","discovery"}
categories = {"discovery", "safe"}
portrule = shortport.port_or_service(111, "rpcbind")
require 'shortport'
require 'rpc'
--- Format a table of version for output.
--@param version_table table containing the versions .
--@return string with the formatted versions.
local format_version = function( version_table )
table.sort( version_table )
return table.concat( version_table, ',' )
end
portrule = shortport.port_or_service(111, "rpcbind", {"tcp", "udp"} )
action = function(host, port)
local socket = nmap.new_socket()
socket:set_timeout(1000)
local catch = function() socket:close() end
local try = nmap.new_try(catch)
local rpc_numbers = try(datafiles.parse_rpc())
try(socket:connect(host.ip, port.number))
local result = {}
local status, rpcinfo = rpc.Helper.RpcInfo( host, port )
-- build rpc dump call packet
local transaction_id = math.random(0x7FFFFFFF)
local request = bin.pack('>IIIIIIILL',0x80000028,transaction_id,0,2,100000,2,4,0,0)
try(socket:send(request))
local status, answer = socket:receive_bytes(1)
if not status then
stdnse.print_debug(1, "%s failed to receive a response from %s:%d with error: %s",
filename:match( "[\\/]([^\\/]+)\.nse$" ) or filename,
host.ip, port.number,
answer or "unknown")
socket:close()
return nil
if ( not(status) ) then
return
end
local _,offset,header,length,tx_id,msg_type,reply_state,accept_state,value,payload,last_fragment
last_fragment = false; offset = 1; payload = ''
-- extract payload from answer and try to receive more packets if
-- RPC header with last_fragment set has not been received
-- If we can't get further packets don't stop but process what we
-- got so far.
while not last_fragment do
if offset > #answer then
local status, data = socket:receive_bytes(1)
if not status then break end
answer = answer .. data
end
offset,header = bin.unpack('>I',answer,offset)
last_fragment = bit.band( header, 0x80000000 ) ~= 0
length = bit.band( header, 0x7FFFFFFF )
payload = payload .. answer:sub( offset, offset + length - 1 )
offset = offset + length
end
socket:close()
offset,tx_id,msg_type,reply_state,_,_,accept_state = bin.unpack( '>IIIIII', payload )
-- transaction_id matches, message type reply, reply state accepted and accept state executed successfully
if tx_id == transaction_id and msg_type == 1 and reply_state == 0 and accept_state == 0 then
local dir = { udp = {}, tcp = {}}
local protocols = {[6]='tcp',[17]='udp'}
local prog, version, proto, port
offset, value = bin.unpack('>I',payload,offset)
while value == 1 and #payload - offset >= 19 do
offset,prog,version,proto,port,value = bin.unpack('>IIIII',payload,offset)
proto = protocols[proto] or tostring( proto )
-- collect data in a table
dir[proto] = dir[proto] or {}
dir[proto][port] = dir[proto][port] or {}
dir[proto][port][prog] = dir[proto][port][prog] or {}
table.insert( dir[proto][port][prog], version )
end
-- format output
local output = tab.new(4)
for proto, o in pairs(dir) do
-- get list of all used ports
local ports = {}
for port,_ in pairs(o) do table.insert(ports, port) end
table.sort(ports)
-- iterate over ports to produce output
for _, port in ipairs(ports) do
for prog, versions in pairs(o[port]) do
local name = rpc_numbers[prog] or ''
tab.addrow(output,prog,format_version(versions),('%5d/%s'):format(port,proto),name)
for progid, v in pairs(rpcinfo) do
for proto, v2 in pairs(v) do
table.insert( result, ("%-7d %-10s %5d/%s %s"):format(progid, stdnse.strjoin(",", v2.version), v2.port, proto, rpc.Util.ProgNumberToName(progid) ) )
end
end
end
return ' \n' .. tab.dump( output )
table.sort(result)
return stdnse.format_output( true, result )
end
end

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@@ -1,3 +1,5 @@
Entry { filename = "afp-path-exploit.nse", categories = { "safe", "vuln", } }
Entry { filename = "afp-path-vuln.nse", categories = { "safe", "vuln", } }
Entry { filename = "afp-showmount.nse", categories = { "discovery", "safe", } }
Entry { filename = "asn-query.nse", categories = { "discovery", "external", "safe", } }
Entry { filename = "auth-owners.nse", categories = { "default", "safe", } }
@@ -57,7 +59,10 @@ Entry { filename = "mysql-info.nse", categories = { "default", "discovery", "saf
Entry { filename = "mysql-users.nse", categories = { "discovery", "intrusive", } }
Entry { filename = "mysql-variables.nse", categories = { "discovery", "intrusive", } }
Entry { filename = "nbstat.nse", categories = { "default", "discovery", "safe", } }
Entry { filename = "nfs-acls.nse", categories = { "discovery", "safe", } }
Entry { filename = "nfs-dirlist.nse", categories = { "discovery", "safe", } }
Entry { filename = "nfs-showmount.nse", categories = { "discovery", "safe", } }
Entry { filename = "nfs-statfs.nse", categories = { "discovery", "safe", } }
Entry { filename = "ntp-info.nse", categories = { "default", "discovery", "safe", } }
Entry { filename = "oracle-sid-brute.nse", categories = { "auth", "intrusive", } }
Entry { filename = "p2p-conficker.nse", categories = { "default", "safe", } }
@@ -68,7 +73,7 @@ Entry { filename = "pop3-capabilities.nse", categories = { "default", "discovery
Entry { filename = "pptp-version.nse", categories = { "version", } }
Entry { filename = "realvnc-auth-bypass.nse", categories = { "default", "safe", "vuln", } }
Entry { filename = "robots.txt.nse", categories = { "default", "discovery", "safe", } }
Entry { filename = "rpcinfo.nse", categories = { "default", "discovery", "safe", } }
Entry { filename = "rpcinfo.nse", categories = { "discovery", "safe", } }
Entry { filename = "skypev2-version.nse", categories = { "version", } }
Entry { filename = "smb-brute.nse", categories = { "auth", "intrusive", } }
Entry { filename = "smb-check-vulns.nse", categories = { "dos", "exploit", "intrusive", "vuln", } }