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ae27b48ffb
duplicating it in every script. This may not be the way we keep doing it, but it's needed for now to keep from having excessive duplication in the printed output.
133 lines
4.1 KiB
Lua
133 lines
4.1 KiB
Lua
id = "SMB Security"
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description = [[
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Returns information about the SMB security level determined by SMB.
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Here is how to interpret the output:
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User-level authentication: Each user has a separate username/password that is used
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to log into the system. This is the default setup of pretty much everything
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these days.
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Share-level authentication: The anonymous account should be used to log in, then
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the password is given (in plaintext) when a share is accessed. All users who
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have access to the share use this password. This was the original way of doing
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things, but isn't commonly seen, now. If a server uses share-level security,
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it is vulnerable to sniffing.
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Challenge/response passwords supported: If enabled, the server can accept any type of
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password:
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* Plaintext
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* LM and NTLM
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* LMv2 and NTLMv2
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If it isn't set, the server can only accept plaintext passwords. Most servers
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are configured to use challenge/response these days. If a server is configured
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to accept plaintext passwords, it is vulnerable to sniffing. LM and NTLM are
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fairly secure, although there are some brute-force attacks against them.
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Message signing: If required, all messages between the client and server must
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be signed by a shared key, derived from the password and the server
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challenge. If supported and not required, message signing is negotiated between
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clients and servers and used if both support and request it. By default,
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Windows clients don't sign messages, so if message signing isn't required by
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the server, messages probably won't be signed; additionally, if performing a
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man-in-the-middle attack, an attacker can negotiate no message signing. If
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message signing isn't required, the server is vulnerable to man-in-the-middle
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attacks.
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This script will allow you to use the <code>smb*</code> script arguments (to
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set the username and password, etc.), but it probably won't ever require them.
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]]
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---
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--@usage
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-- nmap --script smb-security-mode.nse -p445 127.0.0.1
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-- sudo nmap -sU -sS --script smb-security-mode.nse -p U:137,T:139 127.0.0.1
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--
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--@output
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-- | SMB Security: User-level authentication
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-- | SMB Security: Challenge/response passwords supported
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-- |_ SMB Security: Message signing supported
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--
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-- @args smb* This script supports the <code>smbusername</code>,
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-- <code>smbpassword</code>, <code>smbhash</code>, <code>smbguest</code>, and
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-- <code>smbtype</code> script arguments of the <code>smb</code> module.
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-----------------------------------------------------------------------
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author = "Ron Bowes"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"discovery", "safe"}
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require 'smb'
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-- Check whether or not this script should be run.
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hostrule = function(host)
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local port = smb.get_port(host)
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if(port == nil) then
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return false
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else
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return true
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end
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end
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action = function(host)
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local state
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local status, err
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status, state = smb.start(host)
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if(status == false) then
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if(nmap.debugging() > 0) then
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return "ERROR: " .. state
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else
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return nil
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end
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end
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status, err = smb.negotiate_protocol(state)
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if(status == false) then
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smb.stop(state)
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if(nmap.debugging() > 0) then
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return "ERROR: " .. err
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else
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return nil
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end
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end
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local security_mode = state['security_mode']
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local response = ""
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-- User-level authentication or share-level authentication
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if(bit.band(security_mode, 1) == 1) then
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response = response .. "User-level authentication\n"
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else
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response = response .. " Share-level authentication\n"
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end
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-- Challenge/response supported?
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if(bit.band(security_mode, 2) == 0) then
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response = response .. "SMB Security: Plaintext only\n"
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else
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response = response .. "SMB Security: Challenge/response passwords supported\n"
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end
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-- Message signing supported/required?
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if(bit.band(security_mode, 8) == 8) then
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response = response .. "SMB Security: Message signing required\n"
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elseif(bit.band(security_mode, 4) == 4) then
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response = response .. "SMB Security: Message signing supported\n"
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else
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response = response .. "SMB Security: Message signing not supported\n"
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end
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smb.stop(state)
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return response
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end
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