Class: SSHScan::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/ssh_scan/client.rb

Instance Method Summary collapse

Constructor Details

#initialize(ip, port, timeout = 3) ⇒ Client

Returns a new instance of Client.



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# File 'lib/ssh_scan/client.rb', line 10

def initialize(ip, port, timeout = 3)
  @ip = ip
  @timeout = timeout

  @port = port.to_i
  @client_banner = SSHScan::Constants::DEFAULT_CLIENT_BANNER
  @server_banner = nil
  @kex_init_raw = SSHScan::Constants::DEFAULT_KEY_INIT.to_binary_s
end

Instance Method Details



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# File 'lib/ssh_scan/client.rb', line 28

def banner
  @server_banner
end

#close ⇒ Object 



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# File 'lib/ssh_scan/client.rb', line 32

def close()
  begin
    unless @sock.nil?
      @sock.close
    end
  rescue
    @sock = nil
  end
  return true
end

#connect ⇒ Object 



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# File 'lib/ssh_scan/client.rb', line 43

def connect()
  @error = nil

  begin
    Timeout::timeout(@timeout) {
      @sock = Socket.tcp(@ip, @port, connect_timeout: @timeout)
      @raw_server_banner = @sock.gets
    }
  rescue SocketError => e
    @error = SSHScan::Error::ConnectionRefused.new(e.message)
    @sock = nil
  rescue Errno::ETIMEDOUT,
         Timeout::Error => e
    @error = SSHScan::Error::ConnectTimeout.new(e.message)
    @sock = nil
  rescue Errno::ECONNREFUSED => e
    @error = SSHScan::Error::ConnectionRefused.new(e.message)
    @sock = nil
  rescue Errno::ENETUNREACH => e
    @error = SSHScan::Error::ConnectionRefused.new(e.message)
    @sock = nil
   rescue Errno::ECONNRESET => e
    @error = SSHScan::Error::ConnectionRefused.new(e.message)
    @sock = nil
  rescue Errno::EACCES => e
    @error = SSHScan::Error::ConnectionRefused.new(e.message)
    @sock = nil
  rescue Errno::EHOSTUNREACH => e
    @error = SSHScan::Error::ConnectionRefused.new(e.message)
    @sock = nil
  rescue Errno::ENOPROTOOPT => e
    @error = SSHScan::Error::ConnectionRefused.new(e.message)
    @sock = nil
  else
    if @raw_server_banner.nil?
      @error = SSHScan::Error::NoBanner.new(
        "service did not respond with an SSH banner"
      )
      @sock = nil
    else
      @raw_server_banner = @raw_server_banner.chomp
      @server_banner = SSHScan::Banner.read(@raw_server_banner)
      @sock.puts(@client_banner.to_s)
    end
  end
end

#error ⇒ Object 



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# File 'lib/ssh_scan/client.rb', line 94

def error
  @error
end

#error? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/ssh_scan/client.rb', line 90

def error?
  !@error.nil?
end

#get_kex_result(kex_init_raw = @kex_init_raw) ⇒ Object 



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# File 'lib/ssh_scan/client.rb', line 98

def get_kex_result(kex_init_raw = @kex_init_raw)
  if !@sock
    @error = "Socket is no longer valid"
    return nil
  end

  kex_exchange_init = nil

  begin
    Timeout::timeout(@timeout) {
      @sock.write(kex_init_raw)
      resp = @sock.read(4)

      if resp.nil?
        @error = SSHScan::Error::NoKexResponse.new(
          "service did not respond to our kex init request"
        )
        @sock = nil
        return nil
      end

      resp += @sock.read(resp.unpack("N").first)
      @sock.close

      kex_exchange_init = SSHScan::KeyExchangeInit.read(resp)
    }
  rescue Errno::ETIMEDOUT,
         Timeout::Error => e
    @error = SSHScan::Error::ConnectTimeout.new(e.message)
    @sock = nil
    return nil
  rescue Errno::ECONNREFUSED,
         Errno::ENETUNREACH,
         Errno::ECONNRESET,
         Errno::EACCES,
         Errno::EHOSTUNREACH
    @error = SSHScan::Error::NoKexResponse.new(
      "service did not respond to our kex init request"
    )
    @sock = nil
    return nil
  end

  return kex_exchange_init.to_hash
end

#ip ⇒ Object 



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# File 'lib/ssh_scan/client.rb', line 20

def ip
  @ip
end

#port ⇒ Object 



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# File 'lib/ssh_scan/client.rb', line 24

def port
  @port
end