/Ruby 2.7

class DRb::DRbSSLSocket::SSLConfig


SSLConfig handles the needed SSL information for establishing a DRbSSLSocket connection, including generating the X509 / RSA pair.

An instance of this config can be passed to DRbSSLSocket.new, DRbSSLSocket.open and DRbSSLSocket.open_server

See DRb::DRbSSLSocket::SSLConfig.new for more details



Default values for a SSLConfig instance.

See DRb::DRbSSLSocket::SSLConfig.new for more details

Public Class Methods

new(config) Show source
# File lib/drb/ssl.rb, line 127
def initialize(config)
  @config  = config
  @cert    = config[:SSLCertificate]
  @pkey    = config[:SSLPrivateKey]
  @ssl_ctx = nil

Create a new DRb::DRbSSLSocket::SSLConfig instance

The DRb::DRbSSLSocket will take either a config Hash or an instance of SSLConfig, and will setup the certificate for its session for the configuration. If want it to generate a generic certificate, the bare minimum is to provide the :SSLCertName

Config options

From config Hash:


An instance of OpenSSL::X509::Certificate. If this is not provided, then a generic X509 is generated, with a correspond :SSLPrivateKey


A private key instance, like OpenSSL::PKey::RSA. This key must be the key that signed the :SSLCertificate


An OpenSSL::X509::Certificate, or Array of certificates that will used as ClientCAs in the SSL Context


A path to the directory of CA certificates. The certificates must be in PEM format.


A path to a CA certificate file, in PEM format.


A DH callback. See OpenSSL::SSL::SSLContext.tmp_dh_callback


This is the SSL verification mode. See OpenSSL::SSL::VERIFY_* for available modes. The default is OpenSSL::SSL::VERIFY_NONE


Number of CA certificates to walk, when verifying a certificate chain.


A callback to be used for additional verification. See OpenSSL::SSL::SSLContext.verify_callback


A OpenSSL::X509::Store used for verification of certificates


Issuer name for the certificate. This is required when generating the certificate (if :SSLCertificate and :SSLPrivateKey were not given). The value of this is to be an Array of pairs:

[["C", "Raleigh"], ["ST","North Carolina"],

See also OpenSSL::X509::Name


A comment to be used for generating the certificate. The default is “Generated by Ruby/OpenSSL”


These values can be added after the fact, like a Hash.

require 'drb/ssl'
c = DRb::DRbSSLSocket::SSLConfig.new {}
c[:SSLCertificate] =
c[:SSLPrivateKey] = OpenSSL::PKey::RSA.new(File.read('mycert.key'))
c[:SSLVerifyMode] = OpenSSL::SSL::VERIFY_PEER
c[:SSLCACertificatePath] = "/etc/ssl/certs/"


require 'drb/ssl'
c = DRb::DRbSSLSocket::SSLConfig.new({
        :SSLCertName => [["CN" => DRb::DRbSSLSocket.getservername]]

Public Instance Methods

[](key) Show source
# File lib/drb/ssl.rb, line 135
def [](key);
  @config[key] || DEFAULT[key]

A convenience method to access the values like a Hash

accept(tcp) Show source
# File lib/drb/ssl.rb, line 150
def accept(tcp)
  ssl = OpenSSL::SSL::SSLSocket.new(tcp, @ssl_ctx)
  ssl.sync = true

Accept connection to IO tcp, with context of the current certificate configuration

connect(tcp) Show source
# File lib/drb/ssl.rb, line 141
def connect(tcp)
  ssl = ::OpenSSL::SSL::SSLSocket.new(tcp, @ssl_ctx)
  ssl.sync = true

Connect to IO tcp, with context of the current certificate configuration

setup_certificate() Show source
# File lib/drb/ssl.rb, line 160
def setup_certificate
  if @cert && @pkey

  rsa = OpenSSL::PKey::RSA.new(2048){|p, n|
    next unless self[:verbose]
    case p
    when 0; $stderr.putc "."  # BN_generate_prime
    when 1; $stderr.putc "+"  # BN_generate_prime
    when 2; $stderr.putc "*"  # searching good prime,
                              # n = #of try,
                              # but also data from BN_generate_prime
    when 3; $stderr.putc "\n" # found good prime, n==0 - p, n==1 - q,
                              # but also data from BN_generate_prime
    else;   $stderr.putc "*"  # BN_generate_prime

  cert = OpenSSL::X509::Certificate.new
  cert.version = 3
  cert.serial = 0
  name = OpenSSL::X509::Name.new(self[:SSLCertName])
  cert.subject = name
  cert.issuer = name
  cert.not_before = Time.now
  cert.not_after = Time.now + (365*24*60*60)
  cert.public_key = rsa.public_key

  ef = OpenSSL::X509::ExtensionFactory.new(nil,cert)
  cert.extensions = [
    ef.create_extension("subjectKeyIdentifier", "hash") ]
  ef.issuer_certificate = cert
  if comment = self[:SSLCertComment]
    cert.add_extension(ef.create_extension("nsComment", comment))
  cert.sign(rsa, OpenSSL::Digest::SHA256.new)

  @cert = cert
  @pkey = rsa

Ensures that :SSLCertificate and :SSLPrivateKey have been provided or that a new certificate is generated with the other parameters provided.

setup_ssl_context() Show source
# File lib/drb/ssl.rb, line 207
def setup_ssl_context
  ctx = ::OpenSSL::SSL::SSLContext.new
  ctx.cert            = @cert
  ctx.key             = @pkey
  ctx.client_ca       = self[:SSLClientCA]
  ctx.ca_path         = self[:SSLCACertificatePath]
  ctx.ca_file         = self[:SSLCACertificateFile]
  ctx.tmp_dh_callback = self[:SSLTmpDhCallback]
  ctx.verify_mode     = self[:SSLVerifyMode]
  ctx.verify_depth    = self[:SSLVerifyDepth]
  ctx.verify_callback = self[:SSLVerifyCallback]
  ctx.cert_store      = self[:SSLCertificateStore]
  @ssl_ctx = ctx

Establish the OpenSSL::SSL::SSLContext with the configuration parameters provided.

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Licensed under the Ruby License.
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Licensed under their own licenses.