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Whitespace in ike.lua.

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david
2013-06-18 03:44:32 +00:00
parent 1614b7f594
commit af5f103b5f
1 changed files with 114 additions and 98 deletions
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212
nselib/ike.lua
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@@ -15,14 +15,14 @@ The current funcionality includes:
1. Generating a Main or Aggressive Mode IKE request packet with a variable amount of transforms and a vpn group.
2. Sending a packet
3. Receiving the response
4. Parsing the response for VIDs
5. Searching for the VIDs in 'ike-fingerprints.lua'
6. returning a parsed info table
4. Parsing the response for VIDs
5. Searching for the VIDs in 'ike-fingerprints.lua'
6. returning a parsed info table
This library is meant for extension, which could include:
1. complete parsing of the response packet (might allow for better fingerprinting)
2. adding more options to the request packet
vendor field (might give better fingerprinting of services, e.g. Checkpoint)
1. complete parsing of the response packet (might allow for better fingerprinting)
2. adding more options to the request packet
vendor field (might give better fingerprinting of services, e.g. Checkpoint)
3. backoff pattern analyses
...
@@ -36,28 +36,47 @@ author = "Jesper Kueckelhahn"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"discovery", "safe"}
local enc_methods = {
["des"] = 0x80010001,
["3des"] = 0x80010005,
["aes/128"]= { 0x80010007, 0x800E0080 },
["aes/192"]= { 0x80010007, 0x800E00C0 },
["aes/256"]= { 0x80010007, 0x800E0100 }
local enc_methods = {
["des"] = 0x80010001,
["3des"] = 0x80010005,
["aes/128"] = { 0x80010007, 0x800E0080 },
["aes/192"] = { 0x80010007, 0x800E00C0 },
["aes/256"] = { 0x80010007, 0x800E0100 },
}
local authentication= {
["psk"] = 0x80030001,
["rsa"] = 0x80030003,
["Hybrid"] = 0x8003FADD,
["XAUTH"] = 0x8003FDE9,
}
local authentication= { ["psk"] = 0x80030001, ["rsa"] = 0x80030003, ["Hybrid"] = 0x8003FADD, ["XAUTH"] = 0x8003FDE9}
local hash_algo = {
["md5"] = 0x80020001,
["sha1"] = 0x80020002,
}
local hash_algo = { ["md5"] = 0x80020001, ["sha1"] = 0x80020002}
local group_desc = { ["768"] = 0x80040001, ["1024"] = 0x80040002, ["1536"]= 0x80040005}
local exchange_mode = { ["Main"] = 0x02, ["Aggressive"]= 0x04}
local protocol_ids = { ["tcp"] = "06", ["udp"]= "11"}
local group_desc = {
["768"] = 0x80040001,
["1024"] = 0x80040002,
["1536"] = 0x80040005,
}
local exchange_mode = {
["Main"] = 0x02,
["Aggressive"] = 0x04,
}
local protocol_ids = {
["tcp"] = "06",
["udp"] = "11",
}
-- Response packet types
local response_exchange_type = {
["02"] = "Main",
["04"] = "Aggressive",
["05"] = "Informational"
["05"] = "Informational",
}
-- Payload names
@@ -69,7 +88,7 @@ local payloads = {
["05"] = "ID",
["08"] = "Hash",
["0A"] = "Nonce",
["0D"] = "VID"
["0D"] = "VID",
}
@@ -113,8 +132,8 @@ end
--
local function generate_random(length)
local rnd = ""
for i=1, length do
for i=1, length do
rnd = rnd .. string.format("%.2X", math.random(255))
end
return rnd
@@ -125,9 +144,8 @@ end
--
local function convert_to_hex(id)
local hex_str = ""
for c in string.gmatch(id, ".") do
hex_str = hex_str .. string.format("%X", c:byte())
for c in string.gmatch(id, ".") do
hex_str = hex_str .. string.format("%X", c:byte())
end
return hex_str
end
@@ -135,13 +153,13 @@ end
-- Extract Payloads
local function extract_payloads(packet)
-- packet only contains HDR
if packet:len() < 61 then return {} end
local np = packet:sub(33,34) -- next payload
local index = 61 -- starting point for search
local ike_headers = {} -- ike headers
local index = 61 -- starting point for search
local ike_headers = {} -- ike headers
local payload = ''
-- loop over packet
@@ -169,7 +187,7 @@ local function extract_payloads(packet)
-- jump to the next payload
index = index + payload_length
end
return ike_headers
return ike_headers
end
@@ -183,8 +201,8 @@ end
--
-- NOTE: the second step currently only has support for CISCO devices
--
-- Input is a table of collected vendor-ids, output is a table
-- with fields:
-- Input is a table of collected vendor-ids, output is a table
-- with fields:
-- vendor, version, name, attributes (table), guess (table), os
local function lookup(vendor_ids)
if vendor_ids == {} or vendor_ids == nil then return {} end
@@ -206,35 +224,34 @@ local function lookup(vendor_ids)
-- loop over the vendor_ids returned in ike request
for _,vendor_id in pairs(vendor_ids) do
-- loop over the fingerprints found in database
-- loop over the fingerprints found in database
for _,row in pairs(fingerprints) do
if vendor_id:find(row.fingerprint) then
-- if a match is found, check if it's a version detection or attribute
if row.category == 'vendor' then
-- Only store the first match
if info.vendor == nil then
-- the fingerprint contains information about the VID
info.vendor = row
local debug_string = ''
if row.vendor ~= nil then debug_string = debug_string .. row.vendor .. ' ' end
if row.version ~= nil then debug_string = debug_string .. row.version end
if row.version ~= nil then debug_string = debug_string .. row.version end
stdnse.print_debug(2, "IKE: Fingerprint: %s matches %s", vendor_id, debug_string)
end
elseif row.category == 'attribute' then
info.attribs[ #info.attribs + 1] = row
stdnse.print_debug(2, "IKE: Attribute: %s matches %s", vendor_id, row.text)
break
end
end
end
end
end
end
@@ -243,36 +260,36 @@ local function lookup(vendor_ids)
-- Search for the order of the vids
-- Uses category 'vid_ordering'
---
-- search in the 'vid_ordering' category
local debug_string = ''
for _,row in pairs(fingerprints) do
if row.category == 'vid_ordering' and all_vids:find(row.fingerprint) then
-- Use ordering information if there where no vendor matches from prevoius step
if info.vendor == nil then
info.vendor = row
-- Debugging info
debug_string = ''
if info.vendor.vendor ~= nil then debug_string = debug_string .. info.vendor.vendor .. ' ' end
if info.vendor.version ~= nil then debug_string = debug_string .. info.vendor.version .. ' ' end
if info.vendor.ostype ~= nil then debug_string = debug_string .. info.vendor.ostype end
stdnse.print_debug(2, 'IKE: No vendor match, but ordering match found: %s', debug_string)
return info
-- Update OS based on ordering
elseif info.vendor.vendor == row.vendor then
info.vendor.ostype = row.ostype
-- Debugging info
debug_string = ''
if info.vendor.vendor ~= nil then debug_string = debug_string .. info.vendor.vendor .. ' to ' end
if row.ostype ~= nil then debug_string = debug_string .. row.ostype end
stdnse.print_debug(2, 'IKE: Vendor and ordering match. OS updated: %s', debug_string)
return info
-- Only print debugging information if conflicting information is detected
@@ -282,7 +299,7 @@ local function lookup(vendor_ids)
if info.vendor.vendor ~= nil then debug_string = debug_string .. info.vendor.vendor .. ' vs ' end
if row.vendor ~= nil then debug_string = debug_string .. row.vendor end
stdnse.print_debug(2, 'IKE: Found an ordering match, but vendors do not match. %s', debug_string)
end
end
end
@@ -294,8 +311,8 @@ end
-- Handle a response packet
-- A very limited response parser
-- Currently only the VIDs are extracted
-- This could be made more advanced to
-- allow for fingerprinting via the order
-- This could be made more advanced to
-- allow for fingerprinting via the order
-- of the returned headers
---
function response(packet)
@@ -308,7 +325,7 @@ function response(packet)
local ike_headers = {}
-- simple check that the type is something other than 'Informational'
-- as this type does not include VIDs
-- as this type does not include VIDs
if resp_type ~= "Informational" then
resp["mode"] = resp_type
@@ -334,7 +351,7 @@ end
-- and is a hex string
--
function send_request( host, port, packet )
local socket = nmap.new_socket()
local s_status, r_status, data, i, hexstring, _
@@ -345,13 +362,13 @@ function send_request( host, port, packet )
s_status,_ = socket:send(packet)
-- receive answer
if s_status then
if s_status then
r_status, data = socket:receive_lines(1)
if r_status then
i, hexstring = bin.unpack("H" .. data:len(), data)
socket:close()
return response(hexstring)
return response(hexstring)
else
socket:close()
end
@@ -363,7 +380,7 @@ function send_request( host, port, packet )
end
-- Create the aggressive part of a packet
-- Aggressive mode includes the user-id, so the
-- Aggressive mode includes the user-id, so the
-- length of this has to be taken into account
--
local function generate_aggressive(port, protocol, id, diffie)
@@ -377,39 +394,38 @@ local function generate_aggressive(port, protocol, id, diffie)
key_length = 96
elseif diffie == 2 then
key_length = 128
end
end
return bin.pack(">SHHSSHSHCHHH",
-- Key Exchange
0x0a00 , -- Next payload (Nonce)
0x0a00 , -- Next payload (Nonce)
string.format("%04X", key_length+4) , -- Length (132-bit)
generate_random(key_length) , -- Random key data
generate_random(key_length) , -- Random key data
-- Nonce
0x0500 , -- Next payload (Identification)
0x0018 , -- Length (24)
generate_random(20) , -- Nonce data
0x0500 , -- Next payload (Identification)
0x0018 , -- Length (24)
generate_random(20) , -- Nonce data
-- Identification
0x0000 , -- Next Payload (None)
id_len , -- Payload length (id + 8)
0x03 , -- ID Type (USER_FQDN)
hex_prot , -- Protocol ID (UDP)
hex_port , -- Port (500)
convert_to_hex(id) -- Id Data (as hex)
-- Identification
0x0000 , -- Next Payload (None)
id_len , -- Payload length (id + 8)
0x03 , -- ID Type (USER_FQDN)
hex_prot , -- Protocol ID (UDP)
hex_port , -- Port (500)
convert_to_hex(id) -- Id Data (as hex)
)
end
-- Create the transform
-- AES encryption needs an extra value to define the key length
-- Currently only DES, 3DES and AES encryption is supported
-- Currently only DES, 3DES and AES encryption is supported
--
local function generate_transform(auth, encryption, hash, group, number, total)
local key_length, trans_length, aes_enc, sep, enc
local next_payload, payload_number
-- handle special case of aes
if encryption:sub(1,3) == "aes" then
trans_length = 0x0028
@@ -431,25 +447,25 @@ local function generate_transform(auth, encryption, hash, group, number, total)
-- set the payload number
payload_number = string.format("%.2X", number)
local trans = bin.pack(">SSHCSIIII",
local trans = bin.pack(">SSHCSIIII",
next_payload , -- Next payload
trans_length , -- Transform length
payload_number , -- Transform number
0x01 , -- Transform ID (IKE)
0x0000 , -- spacers ?
enc , -- Encryption algorithm
0x01 , -- Transform ID (IKE)
0x0000 , -- spacers ?
enc , -- Encryption algorithm
hash_algo[hash] , -- Hash algorithm
authentication[auth], -- Authentication method
group_desc[group] -- Group Description
authentication[auth] , -- Authentication method
group_desc[group] -- Group Description
)
if key_length ~= nil then
trans = trans .. bin.pack(">I", key_length) -- only set for aes
end
trans = trans .. bin.pack(">IL",
0x800b0001 , -- Life type (seconds)
0x000c000400007080 -- Life duration (28800)
0x800b0001 , -- Life type (seconds)
0x000c000400007080 -- Life duration (28800)
)
return trans
@@ -457,7 +473,7 @@ end
-- Generate multiple transforms
-- Input nust be a table of complete transforms
-- Input nust be a table of complete transforms
--
local function generate_transforms(transform_table)
local transforms = ''
@@ -481,9 +497,9 @@ function request(port, proto, mode, transforms, diffie, id)
transform_string = generate_transforms(transforms)
number_transforms = string.format("%.2X", #transforms)
-- check for aggressive vs Main mode
if mode == "Aggressive" then
str_aggressive = generate_aggressive(port, proto, id, diffie)
-- check for aggressive vs Main mode
if mode == "Aggressive" then
str_aggressive = generate_aggressive(port, proto, id, diffie)
payload_after_sa = 0x0400
else
str_aggressive = ""
@@ -497,29 +513,29 @@ function request(port, proto, mode, transforms, diffie, id)
l_pro = string.format("%.4X", 8 + transform_string:len())
-- Build the packet
local packet = bin.pack(">HLCCCCIHSHIISHCCCH",
local packet = bin.pack(">HLCCCCIHSHIISHCCCH",
generate_random(8) , -- Initiator cookie
0x0000000000000000 , -- Responder cookie
0x01 , -- Next payload (SA)
0x10 , -- Version
0x01 , -- Next payload (SA)
0x10 , -- Version
exchange_mode[mode] , -- Exchange type
0x00 , -- Flags
0x00000000 , -- Message id
l , -- packet length
0x00 , -- Flags
0x00000000 , -- Message id
l , -- packet length
--# Security Association
-- Security Association
payload_after_sa , -- Next payload (Key exchange, if aggressive mode)
l_sa , -- Length
0x00000001 , -- IPSEC
0x00000001 , -- Situation
l_sa , -- Length
0x00000001 , -- IPSEC
0x00000001 , -- Situation
--## Proposal
0x0000 , -- Next payload (None)
l_pro , -- Payload length
0x01 , -- Proposal number
0x01 , -- Protocol ID (ISAKMP)
0x00 , -- SPI Size
0x0000 , -- Next payload (None)
l_pro , -- Payload length
0x01 , -- Proposal number
0x01 , -- Protocol ID (ISAKMP)
0x00 , -- SPI Size
number_transforms -- Proposal transforms
)
@@ -533,4 +549,4 @@ function request(port, proto, mode, transforms, diffie, id)
end
return _ENV
return _ENV