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Patch to fix detection of S7-1200 Model PLCs by Stephen Hilt

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This commit is contained in:
paulino
2015-09-10 02:32:42 +00:00
parent a02a29c28f
commit f89e1968f9
1 changed files with 20 additions and 45 deletions
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61
scripts/s7-info.nse
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@@ -23,10 +23,10 @@ categories = {"discovery", "intrusive"}
---
-- @usage
-- nmap -sP --script s7-info.nse -p 102 <host/s>
-- nmap --script s7-info.nse -p 102 <host/s>
--
-- @output
--102/tcp open Siemens S7 315 PLC
--102/tcp open Siemens S7 PLC
--| s7-info:
--| Basic Hardware: 6ES7 315-2AG10-0AB0
--| System Name: SIMATIC 300(1)
@@ -131,7 +131,7 @@ local function second_parse_response(response, output)
if (value == 0x32) then
-- if the szl-ID is not 0x1c
if( szl_id ~= 0x1c ) then
-- change offset to 4, this is where most ov valid PLCs will fall
-- change offset to 4, this is where most of valid PLCs will fall
offset = 4
end
-- parse system name
@@ -213,8 +213,23 @@ action = function(host, port)
local pos, CC_connect_confirm = bin.unpack("C", response, 6)
-- if PDU type is not 0xd0, then not a successful COTP connection
if ( CC_connect_confirm ~= 0xd0) then
sock:close()
-- create socket for communications
stdnse.debug1('S7INFO:: CREATING NEW SOCKET')
sock = nmap.new_socket()
-- connect to host
local constatus, conerr = sock:connect(host, port)
if not constatus then
stdnse.debug1('Error establishing connection for %s - %s', host, conerr)
return nil
end
response = send_receive(sock, alt_COTP)
local pos, CC_connect_confirm = bin.unpack("C", response, 6)
if ( CC_connect_confirm ~= 0xd0) then
stdnse.debug1('S7 INFO:: Could not negotiate COTP')
return nil
end
end
-- send and receive the ROSCTR Setup Packet
response = send_receive(sock, ROSCTR_Setup)
-- unpack the protocol ID
@@ -238,46 +253,6 @@ action = function(host, port)
response = send_receive(sock, second_SZL_Request)
-- parse the response for more information
output = second_parse_response(response, output)
-- if nothing was parsed from the previous two responses
if(output == nil) then
-- re initialize the table
output = stdnse.output_table()
-- re connect to the device ( a RST packet was sent in the previous attempts)
local constatus, conerr = sock:connect(host, port)
if not constatus then
stdnse.debug1('Error establishing connection for %s - %s', host, conerr)
return nil
end
-- send and receive the alternate COTP Packet, the dst is 200 instead of 102( do nothing with result)
response = send_receive(sock, alt_COTP)
local pos, CC_connect_confirm = bin.unpack("C", response, 6)
-- if PDU type is not 0xd0, then not a successful COTP connection
if ( CC_connect_confirm ~= 0xd0) then
stdnse.debug1("Not a successful COTP Packet")
return nil
end
-- send and receive the packets as before.
response = send_receive(sock, ROSCTR_Setup)
-- unpack the protocol ID
local pos, protocol_id = bin.unpack("C", response, 8)
-- if protocol ID is not 0x32 then return nil
if ( protocol_id ~= 0x32) then
stdnse.debug1("Not a successful S7COMM Packet")
return nil
end
response = send_receive(sock, Read_SZL)
-- unpack the protocol ID
local pos, protocol_id = bin.unpack("C", response, 8)
-- if protocol ID is not 0x32 then return nil
if ( protocol_id ~= 0x32) then
stdnse.debug1("Not a successful S7COMM Packet")
return nil
end
response = send_receive(sock, first_SZL_Request)
output = parse_response(response, host, port, "ONE", output)
response = send_receive(sock, second_SZL_Request)
output = parse_response(response, host, port, "TWO", output)
end
-- close the socket
sock:close()