2007-04-03 07:35:54 +00:00
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module Rex
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module Exploitation
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#
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# Obfuscates javascript in various ways
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#
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class ObfuscateJS
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#
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# Obfuscates symbols found within a javascript string. The symbols
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# argument should have the following format:
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#
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# {
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2007-04-03 07:56:57 +00:00
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# 'Variables' => [ 'var1', ... ],
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2007-04-03 07:35:54 +00:00
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# 'Methods' => [ 'method1', ... ],
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# 'Classes' => [ { 'Namespace' => 'n', 'Class' => 'y'}, ... ],
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# 'Namespaces' => [ 'n', ... ]
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# }
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#
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# Make sure you order your methods, classes, and namespaces by most
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# specific to least specific to prevent partial substitution. For
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# instance, if you have two methods (joe and joeBob), you should place
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# joeBob before joe because it is more specific and will be globally
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# replaced before joe is replaced.
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#
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def self.obfuscate(js, opts = {})
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ObfuscateJS.new(js).obfuscate(opts)
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end
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#
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# Initialize an instance of the obfuscator
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#
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def initialize(js)
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@js = js
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@dynsym = {}
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end
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#
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# Returns the dynamic symbol associated with the supplied symbol name
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#
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def sym(name)
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@dynsym[name]
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end
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#
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# Obfuscates the javascript string passed to the constructor
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#
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def obfuscate(opts = {})
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# Remove our comments
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remove_comments
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# Globally replace symbols
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replace_symbols(opts['Symbols']) if opts['Symbols']
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@js
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end
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#
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# Returns the replaced javascript string
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#
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def to_s
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@js
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end
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protected
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# Get rid of comments
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def remove_comments
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@js.gsub!(/(\/\/.+?\n)/m, '')
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end
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# Replace method, class, and namespace symbols found in the javascript
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# string
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def replace_symbols(symbols)
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taken = { }
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# Generate random symbol names
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[ 'Variables', 'Methods', 'Classes', 'Namespaces' ].each { |symtype|
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next if symbols[symtype].nil?
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symbols[symtype].each { |sym|
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dyn = Rex::Text.rand_text_alpha(rand(32)+1) until dyn and not taken.key?(dyn)
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taken[dyn] = true
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if symtype == 'Classes'
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full_sym = sym['Namespace'] + "." + sym['Class']
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@dynsym[full_sym] = dyn
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@js.gsub!(/#{full_sym}/) { |m|
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sym['Namespace'] + "." + dyn
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}
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else
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@dynsym[sym] = dyn
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@js.gsub!(/#{sym}/, dyn)
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end
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}
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}
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end
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end
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end
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end
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