670 lines
16 KiB
Ruby
670 lines
16 KiB
Ruby
require 'base64'
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require 'md5'
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require 'stringio'
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begin
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require 'zlib'
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rescue LoadError
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end
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module Rex
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###
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#
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# This class formats text in various fashions and also provides
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# a mechanism for wrapping text at a given column.
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#
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###
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module Text
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##
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#
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# Constants
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#
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##
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UpperAlpha = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
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LowerAlpha = "abcdefghijklmnopqrstuvwxyz"
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Numerals = "0123456789"
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Alpha = UpperAlpha + LowerAlpha
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AlphaNumeric = Alpha + Numerals
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DefaultWrap = 60
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AllChars =
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"\xff\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c" +
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"\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a" +
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"\x1b\x1c\x1d\x1e\x1f\x20\x21\x22\x23\x24\x25\x26\x27\x28" +
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"\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30\x31\x32\x33\x34\x35\x36" +
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"\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f\x40\x41\x42\x43\x44" +
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"\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f\x50\x51\x52" +
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"\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f\x60" +
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"\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e" +
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"\x6f\x70\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c" +
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"\x7d\x7e\x7f\x80\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a" +
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"\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98" +
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"\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0\xa1\xa2\xa3\xa4\xa5\xa6" +
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"\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0\xb1\xb2\xb3\xb4" +
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"\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0\xc1\xc2" +
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"\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0" +
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"\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde" +
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"\xdf\xe0\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec" +
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"\xed\xee\xef\xf0\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa" +
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"\xfb\xfc\xfd\xfe"
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DefaultPatternSets = [ Rex::Text::UpperAlpha, Rex::Text::LowerAlpha, Rex::Text::Numerals ]
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##
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#
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# Serialization
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#
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##
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#
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# Converts a raw string into a ruby buffer
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#
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def self.to_ruby(str, wrap = DefaultWrap)
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return hexify(str, wrap, '"', '" +', '', '"')
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end
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#
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# Creates a ruby-style comment
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#
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def self.to_ruby_comment(str, wrap = DefaultWrap)
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return wordwrap(str, 0, wrap, '', '# ')
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end
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#
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# Converts a raw string into a C buffer
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#
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def self.to_c(str, wrap = DefaultWrap, name = "buf")
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return hexify(str, wrap, '"', '"', "unsigned char #{name}[] = \n", '";')
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end
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#
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# Creates a c-style comment
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#
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def self.to_c_comment(str, wrap = DefaultWrap)
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return "/*\n" + wordwrap(str, 0, wrap, '', ' * ') + " */\n"
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end
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#
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# Converts a raw string into a perl buffer
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#
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def self.to_perl(str, wrap = DefaultWrap)
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return hexify(str, wrap, '"', '" .', '', '";')
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end
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#
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# Creates a perl-style comment
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#
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def self.to_perl_comment(str, wrap = DefaultWrap)
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return wordwrap(str, 0, wrap, '', '# ')
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end
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#
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# Returns the raw string
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#
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def self.to_raw(str)
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return str
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end
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#
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# Returns the hex version of the supplied string
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#
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def self.to_hex(str, prefix = "\\x", count = 1)
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raise RuntimeError, "unable to chunk into #{count} byte chunks" if ((str.length % count) > 0)
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# XXX: Regexp.new is used here since using /.{#{count}}/o would compile
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# the regex the first time it is used and never check again. Since we
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# want to know how many to capture on every instance, we do it this
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# way.
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return str.unpack('H*')[0].gsub(Regexp.new(".{#{count * 2}}")) { |s| prefix + s }
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end
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#
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# Converts standard ASCII text to a unicode string.
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#
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# Supported unicode types include: utf-16le, utf16-be, utf32-le, utf32-be, utf-7, and utf-8
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#
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# Providing 'mode' provides hints to the actual encoder as to how it should encode the string. Only UTF-7 and UTF-8 use "mode".
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#
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# utf-7 by default does not encode alphanumeric and a few other characters. By specifying the mode of "all", then all of the characters are encoded, not just the non-alphanumeric set.
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# to_unicode(str, 'utf-7', 'all')
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#
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# utf-8 specifies that alphanumeric characters are used directly, eg "a" is just "a". However, there exist 6 different overlong encodings of "a" that are technically not valid, but parse just fine in most utf-8 parsers. (0xC1A1, 0xE081A1, 0xF08081A1, 0xF8808081A1, 0xFC80808081A1, 0xFE8080808081A1). How many bytes to use for the overlong enocding is specified providing 'size'.
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# to_unicode(str, 'utf-8', 'overlong', 2)
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#
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# Many utf-8 parsers also allow invalid overlong encodings, where bits that are unused when encoding a single byte are modified. Many parsers will ignore these bits, rendering simple string matching to be ineffective for dealing with UTF-8 strings. There are many more invalid overlong encodings possible for "a". For example, three encodings are available for an invalid 2 byte encoding of "a". (0xC1E1 0xC161 0xC121). By specifying "invalid", a random invalid encoding is chosen for the given byte size.
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# to_unicode(str, 'utf-8', 'invalid', 2)
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#
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# utf-7 defaults to 'normal' utf-7 encoding
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# utf-8 defaults to 2 byte 'normal' encoding
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#
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def self.to_unicode(str='', type = 'utf-16le', mode = '', size = '')
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case type
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when 'utf-16le'
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return str.unpack('C*').pack('v*')
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when 'utf-16be'
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return str.unpack('C*').pack('n*')
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when 'utf-32le'
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return str.unpack('C*').pack('V*')
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when 'utf-32be'
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return str.unpack('C*').pack('N*')
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when 'utf-7'
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case mode
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when 'all'
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return str.gsub(/./){ |a|
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out = ''
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if 'a' != '+'
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out = encode_base64(to_unicode(a, 'utf-16be')).gsub(/[=\r\n]/, '')
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end
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'+' + out + '-'
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}
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else
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return str.gsub(/[^\n\r\t\ A-Za-z0-9\'\(\),-.\/\:\?]/){ |a|
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out = ''
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if a != '+'
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out = encode_base64(to_unicode(a, 'utf-16be')).gsub(/[=\r\n]/, '')
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end
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'+' + out + '-'
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}
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end
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when 'utf-8'
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if size == ''
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size = 2
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end
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if size >= 2 and size <= 7
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string = ''
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str.each_byte { |a|
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if (a < 21 || a > 0x7f) || mode != ''
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# ugh. turn a single byte into the binary representation of it, in array form
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bin = [a].pack('C').unpack('B8')[0].split(//)
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# even more ugh.
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bin.collect!{|a| a = a.to_i}
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out = Array.new(8 * size, 0)
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0.upto(size - 1) { |i|
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out[i] = 1
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out[i * 8] = 1
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}
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i = 0
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byte = 0
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bin.reverse.each { |bit|
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if i < 6
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mod = (((size * 8) - 1) - byte * 8) - i
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out[mod] = bit
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else
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byte = byte + 1
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i = 0
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redo
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end
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i = i + 1
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}
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if mode != ''
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case mode
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when 'overlong'
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# do nothing, since we already handle this as above...
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when 'invalid'
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done = 0
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while done == 0
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# the ghetto...
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bits = [7, 8, 15, 16, 23, 24, 31, 32, 41]
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bits.each { |bit|
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bit = (size * 8) - bit
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if bit > 1
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set = rand(2)
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if out[bit] != set
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out[bit] = set
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done = 1
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end
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end
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}
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end
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else
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raise TypeError, 'Invalid mode. Only "overlong" and "invalid" are acceptable modes for utf-8'
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end
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end
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string += [out.join('')].pack('B*')
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else
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string += [a].pack('C')
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end
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}
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return string
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else
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raise TypeError, 'invalid utf-8 size'
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end
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when 'uhwtfms' # suggested name from HD :P
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load_codepage()
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string = ''
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# overloading mode as codepage
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if mode == ''
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mode = 1252 # ANSI - Latan 1, default for US installs of MS products
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else
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mode = mode.to_i
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end
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if $codepage_map_cache[mode].nil?
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raise TypeError, "Invalid codepage #{mode}"
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end
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str.each_byte {|byte|
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char = [byte].pack('C*')
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possible = $codepage_map_cache[mode]['data'][char]
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if possible.nil?
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raise TypeError, "codepage #{mode} does not provide an encoding for 0x#{char.unpack('H*')[0]}"
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end
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string += possible[ rand(possible.length) ]
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}
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return string
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else
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raise TypeError, 'invalid utf type'
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end
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end
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#
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# Encode a string in a manor useful for HTTP URIs and URI Parameters.
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#
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def self.uri_encode(str, mode = 'hex-normal')
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return str if mode == 'none' # fast track no encoding
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all = /[^\/\\]+/
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normal = /[^a-zA-Z1-9]+/
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case mode
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when 'hex-normal'
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return str.gsub(normal) { |s| Rex::Text.to_hex(s, '%') }
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when 'hex-all'
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return str.gsub(all) { |s| Rex::Text.to_hex(s, '%') }
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when 'u-normal'
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return str.gsub(normal) { |s| Rex::Text.to_hex(Rex::Text.to_unicode(s, 'uhwtfms'), '%u', 2) }
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when 'u-all'
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return str.gsub(all) { |s| Rex::Text.to_hex(Rex::Text.to_unicode(s, 'uhwtfms'), '%u', 2) }
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else
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raise TypeError, 'invalid mode'
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end
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end
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#
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# Converts a hex string to a raw string
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#
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def self.hex_to_raw(str)
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[ str.downcase.gsub(/'/,'').gsub(/\\?x([a-f0-9][a-f0-9])/, '\1') ].pack("H*")
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end
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#
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# Wraps text at a given column using a supplied indention
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#
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def self.wordwrap(str, indent = 0, col = DefaultWrap, append = '', prepend = '')
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return str.gsub(/.{1,#{col - indent}}(?:\s|\Z)/){
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( (" " * indent) + prepend + $& + append + 5.chr).gsub(/\n\005/,"\n").gsub(/\005/,"\n")}
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end
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#
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# Converts a string to a hex version with wrapping support
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#
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def self.hexify(str, col = DefaultWrap, line_start = '', line_end = '', buf_start = '', buf_end = '')
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output = buf_start
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cur = 0
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count = 0
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new_line = true
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# Go through each byte in the string
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str.each_byte { |byte|
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count += 1
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append = ''
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# If this is a new line, prepend with the
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# line start text
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if (new_line == true)
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append += line_start
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new_line = false
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end
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# Append the hexified version of the byte
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append += sprintf("\\x%.2x", byte)
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cur += append.length
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# If we're about to hit the column or have gone past it,
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# time to finish up this line
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if ((cur + line_end.length >= col) or
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(cur + buf_end.length >= col))
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new_line = true
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cur = 0
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# If this is the last byte, use the buf_end instead of
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# line_end
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if (count == str.length)
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append += buf_end + "\n"
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else
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append += line_end + "\n"
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end
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end
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output += append
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}
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# If we were in the middle of a line, finish the buffer at this point
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if (new_line == false)
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output += buf_end + "\n"
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end
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return output
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end
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##
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#
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# Transforms
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#
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##
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#
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# Base64 encoder
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#
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def self.encode_base64(str)
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Base64.encode64(str).chomp
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end
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#
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# Base64 decoder
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#
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def self.decode_base64(str)
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Base64.decode64(str)
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end
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#
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# Raw MD5 digest of the supplied string
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#
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def self.md5_raw(str)
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MD5.digest(str)
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end
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#
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# Hexidecimal MD5 digest of the supplied string
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#
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def self.md5(str)
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MD5.hexdigest(str)
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end
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##
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#
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# Generators
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#
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##
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# Base text generator method
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def self.rand_base(len, bad, *foo)
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# Remove restricted characters
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(bad || '').split('').each { |c| foo.delete(c) }
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# Return nil if all bytes are restricted
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return nil if foo.length == 0
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buff = ""
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# Generate a buffer from the remaining bytes
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if foo.length >= 256
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len.times { buff << Kernel.rand(256) }
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else
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len.times { buff += foo[ rand(foo.length) ] }
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end
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return buff
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end
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# Generate random bytes of data
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def self.rand_text(len, bad='', chars = AllChars)
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foo = chars.split('')
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rand_base(len, bad, *foo)
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end
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# Generate random bytes of alpha data
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def self.rand_text_alpha(len, bad='')
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foo = []
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foo += ('A' .. 'Z').to_a
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foo += ('a' .. 'z').to_a
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rand_base(len, bad, *foo )
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end
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# Generate random bytes of lowercase alpha data
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def self.rand_text_alpha_lower(len, bad='')
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rand_base(len, bad, *('a' .. 'z').to_a)
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end
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# Generate random bytes of uppercase alpha data
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def self.rand_text_alpha_upper(len, bad='')
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rand_base(len, bad, *('A' .. 'Z').to_a)
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end
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# Generate random bytes of alphanumeric data
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def self.rand_text_alphanumeric(len, bad='')
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foo = []
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foo += ('A' .. 'Z').to_a
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foo += ('a' .. 'z').to_a
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foo += ('0' .. '9').to_a
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rand_base(len, bad, *foo )
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end
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# Generate random bytes of english-like data
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def self.rand_text_english(len, bad='')
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foo = []
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foo += (0x21 .. 0x7e).map{ |c| c.chr }
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rand_base(len, bad, *foo )
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end
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#
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# Creates a pattern that can be used for offset calculation purposes. This
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# routine is capable of generating patterns using a supplied set and a
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# supplied number of identifiable characters (slots). The supplied sets
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# should not contain any duplicate characters or the logic will fail.
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#
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def self.pattern_create(length, sets = [ UpperAlpha, LowerAlpha, Numerals ])
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buf = ''
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idx = 0
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offsets = []
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sets.length.times { offsets << 0 }
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until buf.length >= length
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begin
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buf += converge_sets(sets, 0, offsets, length)
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rescue RuntimeError
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break
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end
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end
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buf[0..length]
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end
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#
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# Calculate the offset to a pattern
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#
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def self.pattern_offset(pattern, value)
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if (value.kind_of?(String))
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pattern.index(value)
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elsif (value.kind_of?(Fixnum) or value.kind_of?(Bignum))
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pattern.index([ value ].pack('V'))
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else
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raise ArgumentError, "Invalid class for value: #{value.class}"
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end
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end
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#
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# Compresses a string, eliminating all superfluous whitespace before and
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# after lines and eliminating all lines.
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#
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def self.compress(str)
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|
str.gsub(/\n/m, ' ').gsub(/\s+/, ' ').gsub(/^\s+/, '').gsub(/\s+$/, '')
|
|
end
|
|
|
|
# Returns true if zlib can be used.
|
|
def self.zlib_present?
|
|
begin
|
|
Zlib
|
|
return true
|
|
rescue
|
|
return false
|
|
end
|
|
end
|
|
|
|
# backwards compat for just a bit...
|
|
def self.gzip_present?
|
|
self.zlib_present?
|
|
end
|
|
|
|
#
|
|
# Compresses a string using zlib
|
|
#
|
|
def self.zlib_deflate(str)
|
|
raise RuntimeError, "Gzip support is not present." if (!zlib_present?)
|
|
return Zlib::Deflate.deflate(str)
|
|
end
|
|
|
|
#
|
|
# Uncompresses a string using zlib
|
|
#
|
|
def self.zlib_inflate(str)
|
|
raise RuntimeError, "Gzip support is not present." if (!zlib_present?)
|
|
return Zlib::Inflate.inflate(str)
|
|
end
|
|
|
|
#
|
|
# Compresses a string using gzip
|
|
#
|
|
def self.gzip(str, level = 9)
|
|
raise RuntimeError, "Gzip support is not present." if (!zlib_present?)
|
|
raise RuntimeError, "Invalid gzip compression level" if (level < 1 or level > 9)
|
|
|
|
s = ""
|
|
gz = Zlib::GzipWriter.new(StringIO.new(s), level)
|
|
gz << str
|
|
gz.close
|
|
return s
|
|
end
|
|
|
|
#
|
|
# Uncompresses a string using gzip
|
|
#
|
|
def self.ungzip(str)
|
|
raise RuntimeError, "Gzip support is not present." if (!zlib_present?)
|
|
|
|
s = ""
|
|
gz = Zlib::GzipReader.new(StringIO.new(str))
|
|
s << gz.read
|
|
gz.close
|
|
return s
|
|
end
|
|
|
|
#
|
|
# Return the index of the first badchar in data, otherwise return
|
|
# nil if there wasn't any badchar occurences.
|
|
#
|
|
def self.badchar_index(data, badchars = '')
|
|
badchars.each_byte { |badchar|
|
|
pos = data.index(badchar)
|
|
return pos if pos
|
|
}
|
|
return nil
|
|
end
|
|
|
|
#
|
|
# This method removes bad characters from a string.
|
|
#
|
|
def self.remove_badchars(data, badchars = '')
|
|
data.delete(badchars)
|
|
end
|
|
|
|
#
|
|
# This method returns all chars but the supplied set
|
|
#
|
|
def self.charset_exclude(keepers)
|
|
[*(0..255)].pack('C*').delete(keepers)
|
|
end
|
|
|
|
#
|
|
# Shuffles a byte stream
|
|
#
|
|
def self.shuffle_s(str)
|
|
shuffle_a(str.unpack("C*")).pack("C*")
|
|
end
|
|
|
|
#
|
|
# Performs a Fisher-Yates shuffle on an array
|
|
#
|
|
def self.shuffle_a(arr)
|
|
len = arr.length
|
|
max = len - 1
|
|
cyc = [* (0..max) ]
|
|
for d in cyc
|
|
e = rand(d+1)
|
|
next if e == d
|
|
f = arr[d];
|
|
g = arr[e];
|
|
arr[d] = g;
|
|
arr[e] = f;
|
|
end
|
|
return arr
|
|
end
|
|
|
|
protected
|
|
|
|
def self.converge_sets(sets, idx, offsets, length) # :nodoc:
|
|
buf = sets[idx][offsets[idx]].chr
|
|
|
|
# If there are more sets after use, converage with them.
|
|
if (sets[idx + 1])
|
|
buf += converge_sets(sets, idx + 1, offsets, length)
|
|
else
|
|
# Increment the current set offset as well as previous ones if we
|
|
# wrap back to zero.
|
|
while (idx >= 0 and ((offsets[idx] = (offsets[idx] + 1) % sets[idx].length)) == 0)
|
|
idx -= 1
|
|
end
|
|
|
|
# If we reached the point where the idx fell below zero, then that
|
|
# means we've reached the maximum threshold for permutations.
|
|
if (idx < 0)
|
|
raise RuntimeError, "Maximum permutations reached"
|
|
end
|
|
end
|
|
|
|
buf
|
|
end
|
|
|
|
def self.load_codepage()
|
|
return if (!$codepage_map_cache.nil?)
|
|
file = File.join(File.dirname(__FILE__),'codepage.map')
|
|
page = ''
|
|
name = ''
|
|
map = {}
|
|
File.open(file).each { |line|
|
|
next if line =~ /^#/
|
|
next if line =~ /^\s*$/
|
|
data = line.split
|
|
if data[1] =~ /^\(/
|
|
page = data.shift.to_i
|
|
name = data.join(' ').sub(/^\(/,'').sub(/\)$/,'')
|
|
map[page] = {}
|
|
map[page]['name'] = name
|
|
map[page]['data'] = {}
|
|
else
|
|
data.each { |entry|
|
|
wide, char = entry.split(':')
|
|
char = [char].pack('H*')
|
|
wide = [wide].pack('H*')
|
|
if map[page]['data'][char].nil?
|
|
map[page]['data'][char] = [wide]
|
|
else
|
|
map[page]['data'][char].push(wide)
|
|
end
|
|
}
|
|
end
|
|
}
|
|
$codepage_map_cache = map
|
|
end
|
|
|
|
end
|
|
end
|