385 lines
8.6 KiB
Ruby
385 lines
8.6 KiB
Ruby
require 'base64'
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require 'md5'
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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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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)
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return str.gsub(/./) { |s| "\\x%.2x" % s[0] }
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end
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#
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# Converts standard ASCII text to 16-bit unicode
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#
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def self.to_unicode(str='')
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str.unpack('C*').pack('v*')
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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='')
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chr =
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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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foo = chr.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+$/, '')
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end
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#
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# Return the index of the first badchar in data, otherwise return
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# nil if there wasn't any badchar occurences.
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#
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def self.badchar_index(data, badchars = '')
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badchars.each_byte { |badchar|
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pos = data.index(badchar)
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return pos if pos
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}
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return nil
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end
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#
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# This method removes bad characters from a string.
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#
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def self.remove_badchars(data, badchars = '')
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data.delete(badchars)
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end
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#
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# This method returns all chars but the supplied set
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#
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def self.charset_exclude(keepers)
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[*(0..255)].pack('C*').delete(keepers)
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end
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protected
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def self.converge_sets(sets, idx, offsets, length) # :nodoc:
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buf = sets[idx][offsets[idx]].chr
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# If there are more sets after use, converage with them.
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if (sets[idx + 1])
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buf += converge_sets(sets, idx + 1, offsets, length)
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else
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# Increment the current set offset as well as previous ones if we
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# wrap back to zero.
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while (idx >= 0 and ((offsets[idx] = (offsets[idx] + 1) % sets[idx].length)) == 0)
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idx -= 1
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end
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# If we reached the point where the idx fell below zero, then that
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# means we've reached the maximum threshold for permutations.
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if (idx < 0)
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raise RuntimeError, "Maximum permutations reached"
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end
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end
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buf
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end
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end
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end
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