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cryptcheck
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SSH support

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v1
Aeris 8 years ago
parent 7298746ccb
commit 6de0fd5516
5 changed files with 278 additions and 0 deletions
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  1. 1
      bin/check_ssh
  2. 17
      bin/check_ssh.rb
  3. 1
      cryptcheck.gemspec
  4. 142
      lib/cryptcheck/ssh/grade.rb
  5. 117
      lib/cryptcheck/ssh/server.rb

1
bin/check_ssh
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@ -0,0 +1 @@
runner

17
bin/check_ssh.rb
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#!/usr/bin/env ruby
$:.unshift File.expand_path File.join File.dirname(__FILE__), '../lib'
require 'rubygems'
require 'bundler/setup'
require 'cryptcheck'
name, port, level = case ARGV.length
when 1 then [ARGV[0], 22, :info]
when 2 then [ARGV[0], ARGV[1], :info]
when 3 then [ARGV[0], ARGV[1], ARGV[3]]
end
::CryptCheck::Logger.level = level
server = ::CryptCheck::Ssh::Server.new name, port
#grade = ::CryptCheck::Ssh::Grade.new server
#::CryptCheck::Logger.info { '' }
#grade.display

1
cryptcheck.gemspec
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@ -35,4 +35,5 @@ Gem::Specification.new do |spec|
spec.add_dependency 'parallel', '~> 1.3', '>= 1.3.4'
spec.add_dependency 'ruby-progressbar', '~> 1.7', '>= 1.7.1'
spec.add_dependency 'colorize', '~> 0.7', '>= 0.7.7'
spec.add_dependency 'net-ssh', '~> 2.9', '>= 2.9.2'
end

142
lib/cryptcheck/ssh/grade.rb
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module CryptCheck
module Tls
class TlsNotSupportedGrade
attr_reader :server, :score, :grade
def initialize(server)
@server, @score, @grade = server, -1, 'X'
end
end
class Grade
attr_reader :server, :protocol_score, :key_exchange_score, :cipher_strengths_score, :score, :grade, :error, :warning, :success
def initialize(server)
@server = server
calculate_protocol_score
calculate_key_exchange_score
calculate_cipher_strengths_score
@score = @protocol_score*0.3 + @key_exchange_score*0.3 + @cipher_strengths_score*0.4
calculate_error
calculate_warning
calculate_success
calculate_grade
end
def display
color = case self.grade
when 'A+' then :blue
when 'A' then :green
when 'B', 'C' then :yellow
when 'E', 'F' then :red
when 'M', 'T' then { color: :white, background: :red }
end
Logger.info { "Grade : #{self.grade.colorize color }" }
Logger.info { '' }
Logger.info { "Protocole : #{self.protocol_score} / 100" }
Logger.info { "Key exchange : #{self.key_exchange_score} / 100" }
Logger.info { "Ciphers strength : #{self.cipher_strengths_score} / 100" }
Logger.info { "Overall score : #{self.score} / 100" }
Logger.info { '' }
Logger.info { "Errors : #{self.error.join(' ').colorize :red }" } unless self.error.empty?
Logger.info { "Warnings : #{self.warning.join(' ').colorize :yellow }" } unless self.warning.empty?
Logger.info { "Best practices : #{self.success.join(' ').colorize :green }" } unless self.success.empty?
end
private
def calculate_grade
@grade = case @score
when 0...20 then 'F'
when 20...35 then 'E'
when 35...50 then 'D'
when 50...65 then 'C'
when 65...80 then 'B'
else 'A'
end
@grade = [@grade, 'B'].max if !@server.tlsv1_2? or @server.key_size < 2048
@grade = [@grade, 'C'].max if @server.des3?
@grade = [@grade, 'F'].max unless @error.empty?
@grade = 'M' unless @server.cert_valid
@grade = 'T' unless @server.cert_trusted
@grade = 'A+' if @grade == 'A' and @error.empty? and @warning.empty? and (all_success & @success) == all_success
end
def calculate_error
@error = []
@error << :md5_sig if @server.md5_sig?
@error << :sslv2 if @server.sslv2?
@error << :sslv3 if @server.sslv3?
@error << :md5 if @server.md5?
@error << :anonymous if @server.anonymous?
@error << :dss if @server.dss?
@error << :null if @server.null?
@error << :export if @server.export?
@error << :des if @server.des?
@error << :rc4 if @server.rc4?
end
def calculate_warning
@warning = []
@warning << :sha1_sig if @server.sha1_sig?
#@warning << :sha1 if @server.sha1?
@warning << :des3 if @server.des3?
end
def calculate_success
@success = []
@success << :pfs if @server.pfs_only?
end
ALL_ERROR = %i(md5_sig md5 anonymous dss null export des rc4)
def all_error
ALL_ERROR
end
ALL_WARNING = %i(sha1_sig des3)
def all_warning
ALL_WARNING
end
ALL_SUCCESS = %i(pfs)
def all_success
ALL_SUCCESS
end
METHODS_SCORES = { SSLv2: 0, SSLv3: 20, TLSv1: 60, TLSv1_1: 80, TLSv1_2: 100 }
def calculate_protocol_score
@protocol_score = @server.supported_protocols.collect { |p| METHODS_SCORES[p] }.min
end
def calculate_key_exchange_score
@key_exchange_score = case @server.key_size
when 0 then 0
when 0...512 then 10
when 512...1024 then 20
when 1024...2048 then 50
when 2048...4096 then 90
else 100
end
end
def calculate_cipher_strengths_score
@cipher_strengths_score = case @server.cipher_size
when 0 then 0
when 0...112 then 10
when 112...128 then 50
when 128...256 then 90
else 100
end
end
end
end
end

117
lib/cryptcheck/ssh/server.rb
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require 'net/ssh'
module CryptCheck
module Ssh
class SshNotSupportedServer
attr_reader :hostname, :port
def initialize(hostname, port)
@hostname, @port = hostname, port
end
end
class Server
TCP_TIMEOUT = 10
class SshNotAvailableException < Exception
end
attr_reader :hostname, :port, :kex, :encryption, :hmac, :compression, :key
KEX = {
'curve25519-sha256@libssh.org' => :green,
'diffie-hellman-group1-sha1' => :yellow,
'diffie-hellman-group14-sha1' => :yellow,
'diffie-hellman-group-exchange-sha1' => :yellow,
'diffie-hellman-group-exchange-sha256' => :green,
'ecdh-sha2-nistp256' => :yellow,
'ecdh-sha2-nistp384' => :yellow,
'ecdh-sha2-nistp521' => :yellow
}
ENCRYPTION = {
'3des-cbc' => :red,
'aes128-cbc' => :yellow,
'aes192-cbc' => :yellow,
'aes256-cbc' => :yellow,
'aes128-ctr' => :yellow,
'aes192-ctr' => :yellow,
'aes256-ctr' => :yellow,
'aes128-gcm@openssh.com' => :green,
'aes256-gcm@openssh.com' => :green,
'arcfour' => :red,
'arcfour128' => :red,
'arcfour256' => :red,
'blowfish-cbc' => :yellow,
'cast128-cbc' => nil,
'chacha20-poly1305@openssh.com' => :green
}
HMAC = {
'hmac-md5' => :red,
'hmac-md5-96' => :red,
'hmac-ripemd160' => :green,
'hmac-sha1' => :yellow,
'hmac-sha1-96' => :red,
'hmac-sha2-256' => :green,
'hmac-sha2-512' => :green,
'umac-64@openssh.com' => :red,
'umac-128@openssh.com' => nil,
'hmac-md5-etm@openssh.com' => :red,
'hmac-md5-96-etm@openssh.com' => :red,
'hmac-ripemd160-etm@openssh.com' => :green,
'hmac-sha1-etm@openssh.com' => :yellow,
'hmac-sha1-96-etm@openssh.com' => :red,
'hmac-sha2-256-etm@openssh.com' => :green,
'hmac-sha2-512-etm@openssh.com' => :green,
'umac-64-etm@openssh.com' => :red,
'umac-128-etm@openssh.com' => nil
}
COMPRESSION = {
'none' => nil,
'zlib@openssh.com' => nil
}
KEY = {
'ecdsa-sha2-nistp256-cert-v01@openssh.com' => :yellow,
'ecdsa-sha2-nistp384-cert-v01@openssh.com' => :yellow,
'ecdsa-sha2-nistp521-cert-v01@openssh.com' => :yellow,
'ssh-ed25519-cert-v01@openssh.com' => :green,
'ssh-rsa-cert-v01@openssh.com' => :yellow,
'ssh-dss-cert-v01@openssh.com' => :red,
'ssh-rsa-cert-v00@openssh.com' => :yellow,
'ssh-dss-cert-v00@openssh.com' => :red,
'ecdsa-sha2-nistp256' => :yellow,
'ecdsa-sha2-nistp384' => :yellow,
'ecdsa-sha2-nistp521' => :yellow,
'ssh-ed25519' => :green,
'ssh-rsa' => :yellow,
'ssh-dss' => :red
}
def initialize(hostname, port)
@hostname, @port = hostname, port
Logger.info { "#{hostname}:#{port}".colorize :blue }
session = ::Net::SSH::Transport::Session.new @hostname, port: @port, timeout: TCP_TIMEOUT
data = session.algorithms.instance_variable_get :@server_data
@kex, @encryption, @hmac, @compression, @key = data[:kex], data[:encryption_server], data[:hmac_server], data[:compression_server], data[:host_key]
Logger.info { '' }
@kex.each { |k| Logger.info { "Key exchange : #{k.colorize KEX[k]}" } }
Logger.info { '' }
@encryption.each { |e| Logger.info { "Encryption : #{e.colorize ENCRYPTION[e]}" } }
Logger.info { '' }
@hmac.each { |h| Logger.info { "HMAC : #{h.colorize HMAC[h]}" } }
Logger.info { '' }
@compression.each { |c| Logger.info { "Compression : #{c}" } }
Logger.info { '' }
@key.each { |k| Logger.info { "Key type : #{k.colorize KEY[k]}" } }
session.close
rescue => e
Logger.debug { "SSH not supported : #{e}" }
raise SshNotAvailableException, e
end
end
end
end
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