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# frozen_string_literal: false
#
# ssl.rb -- SSL/TLS enhancement for GenericServer
#
# Copyright (c) 2003 GOTOU Yuuzou All rights reserved.
#
# $Id$
require 'webrick'
require 'openssl'
module WEBrick
module Config
svrsoft = General[:ServerSoftware]
osslv = ::OpenSSL::OPENSSL_VERSION.split[1]
##
# Default SSL server configuration.
#
# WEBrick can automatically create a self-signed certificate if
# <code>:SSLCertName</code> is set. For more information on the various
# SSL options see OpenSSL::SSL::SSLContext.
#
# :ServerSoftware ::
# The server software name used in the Server: header.
# :SSLEnable :: false,
# Enable SSL for this server. Defaults to false.
# :SSLCertificate ::
# The SSL certificate for the server.
# :SSLPrivateKey ::
# The SSL private key for the server certificate.
# :SSLClientCA :: nil,
# Array of certificates that will be sent to the client.
# :SSLExtraChainCert :: nil,
# Array of certificates that will be added to the certificate chain
# :SSLCACertificateFile :: nil,
# Path to a CA certificate file
# :SSLCACertificatePath :: nil,
# Path to a directory containing CA certificates
# :SSLCertificateStore :: nil,
# OpenSSL::X509::Store used for certificate validation of the client
# :SSLTmpDhCallback :: nil,
# Callback invoked when DH parameters are required.
# :SSLVerifyClient ::
# Sets whether the client is verified. This defaults to VERIFY_NONE
# which is typical for an HTTPS server.
# :SSLVerifyDepth ::
# Number of CA certificates to walk when verifying a certificate chain
# :SSLVerifyCallback ::
# Custom certificate verification callback
# :SSLServerNameCallback::
# Custom servername indication callback
# :SSLTimeout ::
# Maximum session lifetime
# :SSLOptions ::
# Various SSL options
# :SSLCiphers ::
# Ciphers to be used
# :SSLStartImmediately ::
# Immediately start SSL upon connection? Defaults to true
# :SSLCertName ::
# SSL certificate name. Must be set to enable automatic certificate
# creation.
# :SSLCertComment ::
# Comment used during automatic certificate creation.
SSL = {
:ServerSoftware => "#{svrsoft} OpenSSL/#{osslv}",
:SSLEnable => false,
:SSLCertificate => nil,
:SSLPrivateKey => nil,
:SSLClientCA => nil,
:SSLExtraChainCert => nil,
:SSLCACertificateFile => nil,
:SSLCACertificatePath => nil,
:SSLCertificateStore => nil,
:SSLTmpDhCallback => nil,
:SSLVerifyClient => ::OpenSSL::SSL::VERIFY_NONE,
:SSLVerifyDepth => nil,
:SSLVerifyCallback => nil, # custom verification
:SSLTimeout => nil,
:SSLOptions => nil,
:SSLCiphers => nil,
:SSLStartImmediately => true,
# Must specify if you use auto generated certificate.
:SSLCertName => nil,
:SSLCertComment => "Generated by Ruby/OpenSSL"
}
General.update(SSL)
end
module Utils
##
# Creates a self-signed certificate with the given number of +bits+,
# the issuer +cn+ and a +comment+ to be stored in the certificate.
def create_self_signed_cert(bits, cn, comment)
rsa = OpenSSL::PKey::RSA.new(bits){|p, n|
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
end
}
cert = OpenSSL::X509::Certificate.new
cert.version = 2
cert.serial = 1
name = (cn.kind_of? String) ? OpenSSL::X509::Name.parse(cn)
: OpenSSL::X509::Name.new(cn)
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)
ef.issuer_certificate = cert
cert.extensions = [
ef.create_extension("basicConstraints","CA:FALSE"),
ef.create_extension("keyUsage", "keyEncipherment"),
ef.create_extension("subjectKeyIdentifier", "hash"),
ef.create_extension("extendedKeyUsage", "serverAuth"),
ef.create_extension("nsComment", comment),
]
aki = ef.create_extension("authorityKeyIdentifier",
"keyid:always,issuer:always")
cert.add_extension(aki)
cert.sign(rsa, OpenSSL::Digest::SHA256.new)
return [ cert, rsa ]
end
module_function :create_self_signed_cert
end
##
#--
# Updates WEBrick::GenericServer with SSL functionality
class GenericServer
##
# SSL context for the server when run in SSL mode
def ssl_context # :nodoc:
@ssl_context ||= begin
if @config[:SSLEnable]
ssl_context = setup_ssl_context(@config)
@logger.info("\n" + @config[:SSLCertificate].to_text)
ssl_context
end
end
end
undef listen
##
# Updates +listen+ to enable SSL when the SSL configuration is active.
def listen(address, port) # :nodoc:
listeners = Utils::create_listeners(address, port)
if @config[:SSLEnable]
listeners.collect!{|svr|
ssvr = ::OpenSSL::SSL::SSLServer.new(svr, ssl_context)
ssvr.start_immediately = @config[:SSLStartImmediately]
ssvr
}
end
@listeners += listeners
setup_shutdown_pipe
end
##
# Sets up an SSL context for +config+
def setup_ssl_context(config) # :nodoc:
unless config[:SSLCertificate]
cn = config[:SSLCertName]
comment = config[:SSLCertComment]
cert, key = Utils::create_self_signed_cert(2048, cn, comment)
config[:SSLCertificate] = cert
config[:SSLPrivateKey] = key
end
ctx = OpenSSL::SSL::SSLContext.new
ctx.key = config[:SSLPrivateKey]
ctx.cert = config[:SSLCertificate]
ctx.client_ca = config[:SSLClientCA]
ctx.extra_chain_cert = config[:SSLExtraChainCert]
ctx.ca_file = config[:SSLCACertificateFile]
ctx.ca_path = config[:SSLCACertificatePath]
ctx.cert_store = config[:SSLCertificateStore]
ctx.tmp_dh_callback = config[:SSLTmpDhCallback]
ctx.verify_mode = config[:SSLVerifyClient]
ctx.verify_depth = config[:SSLVerifyDepth]
ctx.verify_callback = config[:SSLVerifyCallback]
ctx.servername_cb = config[:SSLServerNameCallback] || proc { |args| ssl_servername_callback(*args) }
ctx.timeout = config[:SSLTimeout]
ctx.options = config[:SSLOptions]
ctx.ciphers = config[:SSLCiphers]
ctx
end
##
# ServerNameIndication callback
def ssl_servername_callback(sslsocket, hostname = nil)
# default
end
end
end
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