Module: SSH_Fingerprint2

Defined in:
lib/audit/lib/ssh_fingerprint2.rb

Class Method Summary collapse

Class Method Details

.fingerprint(host, port = 22, timeout = 10) ⇒ Object 



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# File 'lib/audit/lib/ssh_fingerprint2.rb', line 122

def self.fingerprint(host, port = 22, timeout = 10)
  results = {:host => host, :port => port, :timestamp => Time.now(), :status => :OK}
  logger = Logger.new(STDERR)
  logger.level = Logger::ERROR
  
  begin
    timeout(timeout) do
      begin
        ssh_transport = Net::SSH::Transport::Session.new('localhost', {:logger => logger, :port => port})
        results[:header] = ssh_transport.server_version().header();
        results[:server_version] = ssh_transport.server_version().version();
        results[:cookie] = ssh_transport.algorithms().server_data()[:raw][1 ... 17].bytes().to_a()
        results[:kex_algorithms] = ssh_transport.algorithms().server_data()[:kex]
        results[:server_host_key_algorithms] = ssh_transport.algorithms().server_data()[:host_key]
        results[:encryption_algorithms_client_to_server] = ssh_transport.algorithms().server_data()[:encryption_client]
        results[:encryption_algorithms_server_to_client] = ssh_transport.algorithms().server_data()[:encryption_server]
        results[:mac_algorithms_client_to_server] = ssh_transport.algorithms().server_data()[:hmac_client]
        results[:mac_algorithms_server_to_client] = ssh_transport.algorithms().server_data()[:hmac_server]
        results[:compression_algorithms_client_to_server] = ssh_transport.algorithms().server_data()[:compression_client]
        results[:compression_algorithms_server_to_client] = ssh_transport.algorithms().server_data()[:compression_server]
        results[:languages_client_to_server] = ssh_transport.algorithms().server_data()[:language_client]
        results[:languages_server_to_client] = ssh_transport.algorithms().server_data()[:language_server]
        
        results[:server_keys] = []
        results[:server_keys] << read_key(ssh_transport.algorithms().key_data()[:server_key])
        
        ssh_transport.algorithms().algorithms()[:host_key].reject {|x| x == ssh_transport.algorithms().key_data()[:type]}.each do|host_key_algorithm|
          ssh_transport.close()
          ssh_transport = Net::SSH::Transport::Session.new('localhost', {:logger => logger, :host_key => host_key_algorithm, :paranoid => false})
          
          results[:server_keys] << read_key(ssh_transport.algorithms().key_data()[:server_key])
        end
        
        ssh_authentication = Net::SSH::Authentication::Session.new(ssh_transport, {:logger => logger, :auth_methods => ["none"]})
        ssh_authentication.authenticate("ssh-connection", "dummy")
        
        results[:authentication_methods] = ssh_authentication.allowed_auth_methods()
      rescue Net::SSH::AuthenticationFailed => ex
      end
    end
  rescue Timeout::Error => err 
    return {:host => host, :port => port, :timestamp => Time.now(), :status => :ERROR, :type => :TIMEOUT, :error => err}
  rescue Errno::ECONNREFUSED => err
    return {:host => host, :port => port, :timestamp => Time.now(), :status => :ERROR, :type => :CONNECTION_REFUSED, :error => err}
  end

  return results
end

.read_key(key) ⇒ Object

Read all interesting properties from a key and save them in a map



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# File 'lib/audit/lib/ssh_fingerprint2.rb', line 95

def self.read_key(key)
  buffer = Net::SSH::Buffer.new(key.to_blob())
  type = buffer.read_string()
  
  case type
    when "ssh-rsa"
      e = buffer.read_string()
      n = buffer.read_string()
      size = (n.length() - 1) * 8
    when "ssh-dss"
      p = buffer.read_string()
      q = buffer.read_string()
      g = buffer.read_string()
      pub_key = buffer.read_string()
      size = (pub_key.length() - 1) * 8
  end
      
  
  return {#:key => key, 
      :blob => [key.to_blob()].pack("m").strip(), 
      :fingerprint => key.fingerprint(),
      :size => size,
      :type => key.ssh_type()}
end