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111 lines
2.9 KiB
111 lines
2.9 KiB
module CryptCheck
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module Tls
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class TlsNotSupportedGrade
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attr_reader :server, :score, :grade
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def initialize(server)
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@server, @score, @grade = server, -1, 'X'
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end
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end
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class Grade
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attr_reader :server, :score, :grade, :warning, :success
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def initialize(server)
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@server = server
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protocol_score
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key_exchange_score
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cipher_strengths_score
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@score = @protocol_score*0.3 + @key_exchange_score*0.3 + @cipher_strengths_score*0.4
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calculate_grade
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warning
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success
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perfect
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end
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private
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def calculate_grade
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@grade = case @score
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when 0...20 then 'F'
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when 20...35 then 'E'
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when 35...50 then 'D'
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when 50...65 then 'C'
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when 65...80 then 'B'
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else 'A'
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end
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@grade = [@grade, 'B'].max if !@server.tlsv1_2? or @server.key_size < 2048
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@grade = [@grade, 'C'].max if @server.des3?
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@grade = [@grade, 'E'].max if @server.rc4? or @server.des?
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@grade = [@grade, 'F'].max if @server.ssl? or @server.key_size < 1024
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@grade = 'M' unless @server.cert_valid
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@grade = 'T' unless @server.cert_trusted
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end
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def warning
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@warning = []
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@warning << :md5_sig if @server.md5_sig?
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@warning << :sha1_sig if @server.sha1_sig?
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@warning << :md5 if @server.md5?
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#@warning << :sha1 if @server.sha1?
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@warning << :rc4 if @server.rc4?
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@warning << :des if @server.des?
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@warning << :des3 if @server.des3?
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end
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def success
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@success = []
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@success << :pfs if @server.pfs_only?
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end
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ALL_WARNING = %i(md5_sig md5 rc4 des)
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def all_warning
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ALL_WARNING
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end
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ALL_SUCCESS = %i(pfs)
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def all_success
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ALL_SUCCESS
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end
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def perfect
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@grade = 'A+' if @grade == 'A' and (all_warning & @warning).empty? and (all_success & @success) == all_success
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end
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METHODS_SCORES = { SSLv2: 0, SSLv3: 80, TLSv1: 90, TLSv1_1: 95, TLSv1_2: 100 }
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def protocol_score
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methods = @server.supported_methods
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worst, best = methods[:worst], methods[:best]
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@protocol_score = (METHODS_SCORES[worst] + METHODS_SCORES[best]) / 2
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end
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def key_exchange_score
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@key_exchange_score = case @server.key_size
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when 0 then 0
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when 0...512 then 20
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when 512...1024 then 40
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when 1024...2048 then 80
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when 2048...4096 then 90
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else 100
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end
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end
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def cipher_strength_score(cipher_strength)
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case cipher_strength
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when 0 then 0
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when 0...128 then 20
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when 128...256 then 80
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else 100
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end
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end
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def cipher_strengths_score
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strength = @server.cipher_size
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worst, best = strength[:min], strength[:max]
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@cipher_strengths_score = (cipher_strength_score(worst) + cipher_strength_score(best)) / 2
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end
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end
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end
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end
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