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require 'rubyntlm'
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module Rex::Proto::Gss
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  class ChannelBinding < Net::NTLM::ChannelBinding
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    attr_reader :digest_algorithm
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    def initialize(channel_data, unique_prefix: 'tls-server-end-point', digest_algorithm: 'SHA256')
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      super(channel_data)
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      @unique_prefix = unique_prefix
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      @digest_algorithm = digest_algorithm
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    end
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    def channel_hash
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      @channel_hash ||= OpenSSL::Digest.new(@digest_algorithm, channel)
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    end
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    def self.create(peer_cert)
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      super(peer_cert.to_der)
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    end
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    def self.from_tls_cert(peer_cert)
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      digest_algorithm = 'SHA256'
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      if peer_cert.signature_algorithm
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        # see: https://learn.microsoft.com/en-us/archive/blogs/openspecification/ntlm-and-channel-binding-hash-aka-extended-protection-for-authentication
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        normalized_name = OpenSSL::Digest.new(peer_cert.signature_algorithm).name.upcase
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        unless %[ MD5 SHA1 ].include?(normalized_name)
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          digest_algorithm = normalized_name
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        end
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      end
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      new(peer_cert.to_der, unique_prefix: 'tls-server-end-point', digest_algorithm: digest_algorithm)
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    end
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  end
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end
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