597 lines
12 KiB
Ruby
597 lines
12 KiB
Ruby
#!/usr/bin/env ruby
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module Rex
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module Post
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module Meterpreter
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#
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# Constants
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#
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PACKET_TYPE_REQUEST = 0
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PACKET_TYPE_RESPONSE = 1
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PACKET_TYPE_PLAIN_REQUEST = 10
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PACKET_TYPE_PLAIN_RESPONSE = 11
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#
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# TLV Meta Types
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#
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TLV_META_TYPE_NONE = 0
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TLV_META_TYPE_STRING = (1 << 16)
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TLV_META_TYPE_UINT = (1 << 17)
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TLV_META_TYPE_RAW = (1 << 18)
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TLV_META_TYPE_BOOL = (1 << 19)
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TLV_META_TYPE_COMPRESSED = (1 << 29)
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TLV_META_TYPE_GROUP = (1 << 30)
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TLV_META_TYPE_COMPLEX = (1 << 31)
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#
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# TLV base starting points
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#
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TLV_RESERVED = 0
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TLV_EXTENSIONS = 20000
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TLV_USER = 40000
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TLV_TEMP = 60000
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#
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# TLV Specific Types
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#
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TLV_TYPE_ANY = TLV_META_TYPE_NONE | 0
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TLV_TYPE_METHOD = TLV_META_TYPE_STRING | 1
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TLV_TYPE_REQUEST_ID = TLV_META_TYPE_STRING | 2
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TLV_TYPE_EXCEPTION = TLV_META_TYPE_GROUP | 3
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TLV_TYPE_RESULT = TLV_META_TYPE_UINT | 4
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TLV_TYPE_STRING = TLV_META_TYPE_STRING | 10
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TLV_TYPE_UINT = TLV_META_TYPE_UINT | 11
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TLV_TYPE_BOOL = TLV_META_TYPE_BOOL | 12
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TLV_TYPE_LENGTH = TLV_META_TYPE_UINT | 25
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TLV_TYPE_DATA = TLV_META_TYPE_RAW | 26
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TLV_TYPE_FLAGS = TLV_META_TYPE_UINT | 27
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TLV_TYPE_CHANNEL_ID = TLV_META_TYPE_UINT | 50
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TLV_TYPE_CHANNEL_TYPE = TLV_META_TYPE_STRING | 51
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TLV_TYPE_CHANNEL_DATA = TLV_META_TYPE_RAW | 52
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TLV_TYPE_CHANNEL_DATA_GROUP = TLV_META_TYPE_GROUP | 53
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TLV_TYPE_CHANNEL_CLASS = TLV_META_TYPE_UINT | 54
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TLV_TYPE_CHANNEL_PARENTID = TLV_META_TYPE_UINT | 55
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TLV_TYPE_SEEK_WHENCE = TLV_META_TYPE_UINT | 70
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TLV_TYPE_SEEK_OFFSET = TLV_META_TYPE_UINT | 71
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TLV_TYPE_SEEK_POS = TLV_META_TYPE_UINT | 72
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TLV_TYPE_EXCEPTION_CODE = TLV_META_TYPE_UINT | 300
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TLV_TYPE_EXCEPTION_STRING = TLV_META_TYPE_STRING | 301
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TLV_TYPE_LIBRARY_PATH = TLV_META_TYPE_STRING | 400
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TLV_TYPE_TARGET_PATH = TLV_META_TYPE_STRING | 401
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TLV_TYPE_MIGRATE_PID = TLV_META_TYPE_UINT | 402
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TLV_TYPE_MIGRATE_LEN = TLV_META_TYPE_UINT | 403
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TLV_TYPE_MIGRATE_PAYLOAD = TLV_META_TYPE_STRING | 404
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TLV_TYPE_MIGRATE_ARCH = TLV_META_TYPE_UINT | 405
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TLV_TYPE_CIPHER_NAME = TLV_META_TYPE_STRING | 500
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TLV_TYPE_CIPHER_PARAMETERS = TLV_META_TYPE_GROUP | 501
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#
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# Core flags
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#
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LOAD_LIBRARY_FLAG_ON_DISK = (1 << 0)
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LOAD_LIBRARY_FLAG_EXTENSION = (1 << 1)
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LOAD_LIBRARY_FLAG_LOCAL = (1 << 2)
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###
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#
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# Base TLV (Type-Length-Value) class
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#
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###
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class Tlv
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attr_accessor :type, :value, :compress
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##
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#
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# Constructor
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#
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##
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#
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# Returns an instance of a TLV.
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#
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def initialize(type, value = nil, compress=false)
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@type = type
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@compress = compress
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if (value != nil)
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if (type & TLV_META_TYPE_STRING == TLV_META_TYPE_STRING)
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if (value.kind_of?(Fixnum))
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@value = value.to_s
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else
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@value = value.dup
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end
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else
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@value = value
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end
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end
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end
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##
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#
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# Conditionals
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#
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##
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#
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# Checks to see if a TLVs meta type is equivalent to the meta type passed.
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#
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def meta_type?(meta)
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return (self.type & meta == meta)
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end
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#
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# Checks to see if the TLVs type is equivalent to the type passed.
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#
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def type?(type)
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return self.type == type
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end
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#
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# Checks to see if the TLVs value is equivalent to the value passed.
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#
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def value?(value)
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return self.value == value
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end
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##
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#
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# Serializers
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#
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##
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#
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# Converts the TLV to raw.
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#
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def to_r
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raw = value.to_s;
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if (self.type & TLV_META_TYPE_STRING == TLV_META_TYPE_STRING)
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raw += "\x00"
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elsif (self.type & TLV_META_TYPE_UINT == TLV_META_TYPE_UINT)
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raw = [value].pack("N")
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elsif (self.type & TLV_META_TYPE_BOOL == TLV_META_TYPE_BOOL)
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if (value == true)
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raw = [1].pack("c")
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else
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raw = [0].pack("c")
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end
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end
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# check if the tlv is to be compressed...
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if( @compress )
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raw_uncompressed = raw
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# compress the raw data
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raw_compressed = Rex::Text.zlib_deflate( raw_uncompressed )
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# check we have actually made the raw data smaller...
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# (small blobs often compress slightly larger then the origional)
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# if the compressed data is not smaller, we dont use the compressed data
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if( raw_compressed.length < raw_uncompressed.length )
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# if so, set the TLV's type to indicate compression is used
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self.type = self.type | TLV_META_TYPE_COMPRESSED
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# update the raw data with the uncompressed data length + compressed data
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# (we include the uncompressed data length as the C side will need to know this for decompression)
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raw = [ raw_uncompressed.length ].pack("N") + raw_compressed
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end
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end
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return [raw.length + 8, self.type].pack("NN") + raw
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end
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#
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# Translates the raw format of the TLV into a sanitize version.
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#
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def from_r(raw)
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self.value = nil
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length, self.type = raw.unpack("NN");
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# check if the tlv value has been compressed...
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if( self.type & TLV_META_TYPE_COMPRESSED == TLV_META_TYPE_COMPRESSED )
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# set this TLV as using compression
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@compress = true
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# remove the TLV_META_TYPE_COMPRESSED flag from the tlv type to restore the
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# tlv type to its origional, allowing for transparent data compression.
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self.type = self.type ^ TLV_META_TYPE_COMPRESSED
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# decompress the compressed data (skipping the length and type DWORD's)
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raw_decompressed = Rex::Text.zlib_inflate( raw[8..length-1] )
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# update the length to reflect the decompressed data length (+8 for the length and type DWORD's)
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length = raw_decompressed.length + 8
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# update the raw buffer with the new length, decompressed data and updated type.
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raw = [length, self.type].pack("NN") + raw_decompressed
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end
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if (self.type & TLV_META_TYPE_STRING == TLV_META_TYPE_STRING)
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if (raw.length > 0)
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self.value = raw[8..length-2]
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else
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self.value = nil
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end
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elsif (self.type & TLV_META_TYPE_UINT == TLV_META_TYPE_UINT)
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self.value = raw.unpack("NNN")[2]
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elsif (self.type & TLV_META_TYPE_BOOL == TLV_META_TYPE_BOOL)
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self.value = raw.unpack("NNc")[2]
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if (self.value == 1)
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self.value = true
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else
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self.value = false
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end
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else
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self.value = raw[8..length-1]
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end
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return length;
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end
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end
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###
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#
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# Group TLVs contain zero or more TLVs
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#
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###
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class GroupTlv < Tlv
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attr_accessor :tlvs
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##
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#
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# Constructor
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#
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##
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#
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# Initializes the group TLV container to the supplied type
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# and creates an empty TLV array.
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#
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def initialize(type)
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super(type)
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self.tlvs = [ ]
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end
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##
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#
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# Group-based TLV accessors
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#
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##
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#
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# Enumerates TLVs of the supplied type.
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#
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def each(type = TLV_TYPE_ANY, &block)
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get_tlvs(type).each(&block)
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end
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#
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# Synonym for each.
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#
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def each_tlv(type = TLV_TYPE_ANY, &block)
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each(type, block)
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end
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#
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# Enumerates TLVs of a supplied type with indexes.
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#
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def each_with_index(type = TLV_TYPE_ANY, &block)
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get_tlvs(type).each_with_index(&block)
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end
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#
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# Synonym for each_with_index.
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#
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def each_tlv_with_index(type = TLV_TYPE_ANY, &block)
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each_with_index(type, block)
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end
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#
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# Returns an array of TLVs for the given type.
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#
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def get_tlvs(type)
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if (type == TLV_TYPE_ANY)
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return self.tlvs
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else
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type_tlvs = []
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self.tlvs.each() { |tlv|
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if (tlv.type?(type))
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type_tlvs << tlv
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end
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}
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return type_tlvs
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end
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end
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##
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#
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# TLV management
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#
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##
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#
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# Adds a TLV of a given type and value.
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#
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def add_tlv(type, value = nil, replace = false, compress=false)
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# If we should replace any TLVs with the same type...remove them first
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if (replace)
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each(type) { |tlv|
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if (tlv.type == type)
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self.tlvs.delete(tlv)
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end
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}
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end
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if (type & TLV_META_TYPE_GROUP == TLV_META_TYPE_GROUP)
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tlv = GroupTlv.new(type)
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else
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tlv = Tlv.new(type, value, compress)
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end
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self.tlvs << tlv
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return tlv
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end
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#
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# Adds zero or more TLVs to the packet.
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#
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def add_tlvs(tlvs)
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if (tlvs != nil)
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tlvs.each { |tlv|
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add_tlv(tlv['type'], tlv['value'])
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}
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end
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end
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#
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# Gets the first TLV of a given type.
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#
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def get_tlv(type, index = 0)
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type_tlvs = get_tlvs(type)
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if (type_tlvs.length > index)
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return type_tlvs[index]
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end
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return nil
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end
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#
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# Returns the value of a TLV if it exists, otherwise nil.
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#
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def get_tlv_value(type, index = 0)
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tlv = get_tlv(type, index)
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return (tlv != nil) ? tlv.value : nil
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end
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#
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# Returns an array of values for all tlvs of type type.
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#
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def get_tlv_values(type)
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get_tlvs(type).collect { |a| a.value }
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end
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#
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# Checks to see if the container has a TLV of a given type.
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#
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def has_tlv?(type)
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return get_tlv(type) != nil
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end
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#
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# Zeros out the array of TLVs.
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#
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def reset
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self.tlvs = []
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end
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##
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#
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# Serializers
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#
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##
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#
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# Converts all of the TLVs in the TLV array to raw and prefixes them
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# with a container TLV of this instance's TLV type.
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#
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def to_r
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raw = ''
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self.each() { |tlv|
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raw << tlv.to_r
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}
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return [raw.length + 8, self.type].pack("NN") + raw
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end
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#
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# Converts the TLV group container from raw to all of the individual
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# TLVs.
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#
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def from_r(raw)
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offset = 8
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# Reset the TLVs array
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self.tlvs = []
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self.type = raw.unpack("NN")[1]
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# Enumerate all of the TLVs
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while (offset < raw.length-1)
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tlv = nil
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# Get the length and type
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length, type = raw[offset..offset+8].unpack("NN")
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if (type & TLV_META_TYPE_GROUP == TLV_META_TYPE_GROUP)
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tlv = GroupTlv.new(type)
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else
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tlv = Tlv.new(type)
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end
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tlv.from_r(raw[offset..offset+length])
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# Insert it into the list of TLVs
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tlvs << tlv
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# Move up
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offset += length
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end
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end
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end
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###
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#
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# The logical meterpreter packet class
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#
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###
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class Packet < GroupTlv
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attr_accessor :created_at
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##
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#
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# Factory
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#
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##
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#
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# Creates a request with the supplied method.
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#
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def Packet.create_request(method = nil)
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return Packet.new(PACKET_TYPE_REQUEST, method)
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end
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#
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# Creates a response to a request if one is provided.
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#
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def Packet.create_response(request = nil)
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response_type = PACKET_TYPE_RESPONSE
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method = nil
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if (request)
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if (request.type?(PACKET_TYPE_PLAIN_REQUEST))
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response_type = PACKET_TYPE_PLAIN_RESPONSE
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end
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method = request.method
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end
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return Packet.new(response_type, method)
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end
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##
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#
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# Constructor
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#
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##
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#
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# Initializes the packet to the supplied packet type and method,
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# if any. If the packet is a request, a request identifier is
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# created.
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#
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def initialize(type = nil, method = nil)
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super(type)
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if (method)
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self.method = method
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end
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self.created_at = ::Time.now
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# If it's a request, generate a random request identifier
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if ((type == PACKET_TYPE_REQUEST) ||
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(type == PACKET_TYPE_PLAIN_REQUEST))
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rid = ''
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32.times { |val| rid << rand(10).to_s }
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add_tlv(TLV_TYPE_REQUEST_ID, rid)
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end
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end
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##
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#
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# Conditionals
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#
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##
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#
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# Checks to see if the packet is a response.
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#
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def response?
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return ((self.type == PACKET_TYPE_RESPONSE) ||
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(self.type == PACKET_TYPE_PLAIN_RESPONSE))
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end
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##
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#
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# Accessors
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#
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##
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#
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# Checks to see if the packet's method is equal to the supplied method.
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#
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def method?(method)
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return (get_tlv_value(TLV_TYPE_METHOD) == method)
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end
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#
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# Sets the packet's method TLV to the method supplied.
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#
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def method=(method)
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add_tlv(TLV_TYPE_METHOD, method, true)
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end
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#
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# Returns the value of the packet's method TLV.
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#
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def method
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return get_tlv_value(TLV_TYPE_METHOD)
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end
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#
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# Checks to see if the packet's result value is equal to the supplied
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# result.
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#
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def result?(result)
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return (get_tlv_value(TLV_TYPE_RESULT) == result)
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end
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#
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# Sets the packet's result TLV.
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#
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def result=(result)
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add_tlv(TLV_TYPE_RESULT, result, true)
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end
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#
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# Gets the value of the packet's result TLV.
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#
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def result
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return get_tlv_value(TLV_TYPE_RESULT)
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end
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#
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# Gets the value of the packet's request identifier TLV.
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#
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def rid
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return get_tlv_value(TLV_TYPE_REQUEST_ID)
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end
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end
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end; end; end
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|