DNS and SNMP decoding

git-svn-id: file:///home/svn/framework3/trunk@3841 4d416f70-5f16-0410-b530-b9f4589650da

modules/auxiliary/scanner/discovery/sweep_udp.rb

@@ -101,10 +101,23 @@ class Auxiliary::Scanner::Discovery::SweepUDP < Msf::Auxiliary
 		case pkt[2]
 			when 53
 				app = 'DNS'
+				ver = nil
+				
+				if (not ver and pkt[0] =~ /([6789]\.[\w\.\-_\:\(\)\[\]\/\=\+\|\{\}]+)/i)
+					ver = 'BIND ' + $1
+				end
+
+				ver = 'Microsoft' if (not ver and pkt[0][2,4] == "\x81\x04\x00\x01")
+				ver = 'TinyDNS'   if (not ver and pkt[0][2,4] == "\x81\x81\x00\x01")
+				
+				ver = pkt[0].unpack('H*')[0] if not ver
+				inf = ver if ver
 			when 137
 				app = 'NetBIOS'
+				# inf = pkt[0].unpack('H*')[0]
 			when 111
 				app = 'Portmap'
+				# inf = pkt[0].unpack('H*')[0]
 			when 1434
 				app = 'SQL Server'
 				mssql_ping_parse(pkt[0]).each_pair { |k,v|
@@ -113,6 +126,15 @@ class Auxiliary::Scanner::Discovery::SweepUDP < Msf::Auxiliary
 				
 			when 161
 				app = 'SNMP'
+				begin
+					asn = ASNData.new(pkt[0])
+					inf = asn.access("L0.L0.L0.L0.V1.value")
+					if (inf)
+						inf.gsub!(/\r|\n/, ' ')
+						inf.gsub!(/\s+/, ' ')
+					end
+				rescue ::Exception
+				end
 			when 5093
 				app = 'Sentinel'
 		end
@@ -121,6 +143,75 @@ class Auxiliary::Scanner::Discovery::SweepUDP < Msf::Auxiliary
 		
 	end
 
+	#
+	# Parse a asn1 buffer into a hash tree
+	#
+
+	class ASNData < Hash
+
+		def initialize(data)
+			_parse_asn1(data, self)
+		end
+
+		def _parse_asn1(data, tree)
+			x = 0
+			while (data.length > 0)
+				t = data[0]
+				l = data[1]
+				i = 2
+
+				if (l > 0x7f)
+					lb = l - 0x80
+					l = (("\x00" * (4-lb)) + data[i, lb]).unpack('N')[0]
+					i += lb
+				end
+
+				buff = data[i, l]
+
+				tree[:v] ||= []
+				tree[:l] ||= []
+				case t
+					when 0x00...0x29
+						tree[:v] << [t, buff]
+					else
+						tree[:l][x] ||= ASNData.new(buff)
+						x += 1
+				end
+				data = data[i + l, data.length - l]
+			end		
+		end
+
+		def access(desc)
+			path = desc.split('.')
+			node = self
+			path.each_index do |i|
+				case path[i]
+					when /^V(\d+)$/
+						if (node[:v] and node[:v][$1.to_i])
+							node = node[:v][$1.to_i]
+							next
+						else
+							return nil
+						end
+					when /^L(\d+)$/
+						if (node[:l] and node[:l][$1.to_i])
+							node = node[:l][$1.to_i]
+							next
+						else
+							return nil
+						end		
+					when 'type'
+						return (node and node[0]) ? node[0] : nil
+					when 'value'
+						return (node and node[1]) ? node[1] : nil
+					else
+						return nil
+				end
+			end
+			return node
+		end
+	end
+
 	#
 	# Parse a 'ping' response and format as a hash
 	#
@@ -151,8 +242,8 @@ class Auxiliary::Scanner::Discovery::SweepUDP < Msf::Auxiliary
 	def probe_pkt_dns(ip)	
 		data = [rand(0xffff)].pack('n') +
 		"\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00"+
-		"\x07"+ "PROBER!"+
+		"\x07"+ "VERSION"+
-		"\x04"+ "TEST"+
+		"\x04"+ "BIND"+
 		"\x00\x00\x10\x00\x03"
 		
 		return [data, 53]