Class: HTTPClient::SSLConfig

Inherits:
Object
  • Object
show all
Includes:
Util, OpenSSL
Defined in:
lib/httpclient/ssl_config.rb

Overview

Represents SSL configuration for HTTPClient instance. The implementation depends on OpenSSL.

Trust Anchor Control

SSLConfig loads ‘httpclient/cacert.pem’ as a trust anchor (trusted certificate(s)) with add_trust_ca in initialization time. This means that HTTPClient instance trusts some CA certificates by default, like Web browsers. ‘httpclient/cacert.pem’ is downloaded from curl web site by the author and included in released package.

On JRuby, HTTPClient uses Java runtime’s trusted CA certificates, not cacert.pem by default. You can load cacert.pem by calling SSLConfig#load_trust_ca manually like:

HTTPClient.new { self.ssl_config.load_trust_ca }.get("https://...")

You may want to change trust anchor by yourself. Call clear_cert_store then add_trust_ca for that purpose.

Constant Summary collapse

CIPHERS_DEFAULT =

OpenSSL >1.0.0 default

"ALL:!aNULL:!eNULL:!SSLv2"

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Util

#argument_to_hash, hash_find_value, #http?, #https?, #keyword_argument, try_require, uri_dirname, uri_part_of, urify, #warning

Constructor Details

#initialize(client) ⇒ SSLConfig

Creates a SSLConfig.



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# File 'lib/httpclient/ssl_config.rb', line 96

def initialize(client)
  return unless SSLEnabled
  @client = client
  @cert_store = X509::Store.new
  @cert_store_items = [:default]
  @cert_store_crl_items = []
  @client_cert = @client_key = @client_ca = nil
  @verify_mode = SSL::VERIFY_PEER | SSL::VERIFY_FAIL_IF_NO_PEER_CERT
  @verify_depth = nil
  @verify_callback = nil
  @dest = nil
  @timeout = nil
  @ssl_version = :auto
  # Follow ruby-ossl's definition
  @options = OpenSSL::SSL::OP_ALL
  @options &= ~OpenSSL::SSL::OP_DONT_INSERT_EMPTY_FRAGMENTS if defined?(OpenSSL::SSL::OP_DONT_INSERT_EMPTY_FRAGMENTS)
  @options |= OpenSSL::SSL::OP_NO_COMPRESSION if defined?(OpenSSL::SSL::OP_NO_COMPRESSION)
  @options |= OpenSSL::SSL::OP_NO_SSLv2 if defined?(OpenSSL::SSL::OP_NO_SSLv2)
  @options |= OpenSSL::SSL::OP_NO_SSLv3 if defined?(OpenSSL::SSL::OP_NO_SSLv3)
  # OpenSSL 0.9.8 default: "ALL:!ADH:!LOW:!EXP:!MD5:+SSLv2:@STRENGTH"
  @ciphers = CIPHERS_DEFAULT
  @cacerts_loaded = false
end

Instance Attribute Details

#cert_store ⇒ Object

OpenSSL::X509::X509::Store used for verification. You can reset the store with clear_cert_store and set the new store with cert_store=.



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# File 'lib/httpclient/ssl_config.rb', line 86

def cert_store
  @cert_store
end

#cert_store_crl_items ⇒ Object (readonly)

Returns the value of attribute cert_store_crl_items.



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# File 'lib/httpclient/ssl_config.rb', line 93

def cert_store_crl_items
  @cert_store_crl_items
end

#cert_store_items ⇒ Object (readonly)

These array keeps original files/dirs that was added to @cert_store



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# File 'lib/httpclient/ssl_config.rb', line 92

def cert_store_items
  @cert_store_items
end

#ciphers ⇒ Object

A String of OpenSSL’s cipher configuration. Default value is ALL:!ADH:!LOW:!EXP:!MD5:+SSLv2:@STRENGTH See ciphers(1) man in OpenSSL for more detail.



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# File 'lib/httpclient/ssl_config.rb', line 82

def ciphers
  @ciphers
end

#client_ca ⇒ Object

For server side configuration. Ignore this.



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# File 'lib/httpclient/ssl_config.rb', line 89

def client_ca
  @client_ca
end

#client_cert ⇒ Object

OpenSSL::X509::Certificate

certificate for SSL client authentication.

nil by default. (no client authentication)



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# File 'lib/httpclient/ssl_config.rb', line 53

def client_cert
  @client_cert
end

#client_key ⇒ Object

OpenSSL::PKey::PKey

private key for SSL client authentication.

nil by default. (no client authentication)



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# File 'lib/httpclient/ssl_config.rb', line 56

def client_key
  @client_key
end

#client_key_pass ⇒ Object (readonly)

Returns the value of attribute client_key_pass.



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# File 'lib/httpclient/ssl_config.rb', line 57

def client_key_pass
  @client_key_pass
end

#options ⇒ Object

A number of OpenSSL’s SSL options. Default value is OpenSSL::SSL::OP_ALL | OpenSSL::SSL::OP_NO_SSLv2 CAUTION: this is OpenSSL specific option and ignored on JRuby. Use ssl_version to specify the TLS version you want to use.



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# File 'lib/httpclient/ssl_config.rb', line 78

def options
  @options
end

#ssl_version ⇒ Object

Which TLS protocol version (also called method) will be used. Defaults to :auto which means that OpenSSL decides (In my tests this resulted with always the highest available protocol being used). String name of OpenSSL’s SSL version method name: TLSv1_2, TLSv1_1, TLSv1, SSLv2, SSLv23, SSLv3 or :auto (and nil) to allow version negotiation (default). See OpenSSL::SSL::SSLContext::METHODS for a list of available versions in your specific Ruby environment.



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# File 'lib/httpclient/ssl_config.rb', line 50

def ssl_version
  @ssl_version
end

#timeout ⇒ Object

SSL timeout in sec. nil by default.



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# File 'lib/httpclient/ssl_config.rb', line 73

def timeout
  @timeout
end

#verify_callback ⇒ Object

A callback handler for custom certificate verification. nil by default. If the handler is set, handler.call is invoked just after general OpenSSL’s verification. handler.call is invoked with 2 arguments, ok and ctx; ok is a result of general OpenSSL’s verification. ctx is a OpenSSL::X509::StoreContext.



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# File 'lib/httpclient/ssl_config.rb', line 71

def verify_callback
  @verify_callback
end

#verify_depth ⇒ Object

A number of verify depth. Certification path which length is longer than this depth is not allowed. CAUTION: this is OpenSSL specific option and ignored on JRuby.



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# File 'lib/httpclient/ssl_config.rb', line 65

def verify_depth
  @verify_depth
end

#verify_mode ⇒ Object

A number which represents OpenSSL’s verify mode. Default value is OpenSSL::SSL::VERIFY_PEER | OpenSSL::SSL::VERIFY_FAIL_IF_NO_PEER_CERT.



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# File 'lib/httpclient/ssl_config.rb', line 61

def verify_mode
  @verify_mode
end

Instance Method Details

#add_crl(crl) ⇒ Object Also known as: set_crl

Adds CRL for verification.

crl

a OpenSSL::X509::CRL or a filename of a PEM/DER formatted OpenSSL::X509::CRL.

On JRuby, instead of setting CRL by yourself you can set following options to let HTTPClient to perform revocation check with CRL and OCSP: -J-Dcom.sun.security.enableCRLDP=true -J-Dcom.sun.net.ssl.checkRevocation=true ex. jruby -J-Dcom.sun.security.enableCRLDP=true -J-Dcom.sun.net.ssl.checkRevocation=true app.rb

Revoked cert example: test-sspev.verisign.com:2443/test-SSPEV-revoked-verisign.html

Calling this method resets all existing sessions.



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# File 'lib/httpclient/ssl_config.rb', line 241

def add_crl(crl)
  unless crl.is_a?(X509::CRL)
    crl = X509::CRL.new(File.open(crl) { |f| f.read })
  end
  @cert_store.add_crl(crl)
  @cert_store_crl_items << crl
  @cert_store.flags = X509::V_FLAG_CRL_CHECK | X509::V_FLAG_CRL_CHECK_ALL
  change_notify
end

#add_trust_ca(trust_ca_file_or_hashed_dir) ⇒ Object Also known as: set_trust_ca

Sets trust anchor certificate(s) for verification.

trust_ca_file_or_hashed_dir

a filename of a PEM/DER formatted OpenSSL::X509::Certificate or a ‘c-rehash’eddirectory name which stores trusted certificate files.

Calling this method resets all existing sessions.



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# File 'lib/httpclient/ssl_config.rb', line 206

def add_trust_ca(trust_ca_file_or_hashed_dir)
  @cacerts_loaded = true # avoid lazy override
  add_trust_ca_to_store(@cert_store, trust_ca_file_or_hashed_dir)
  @cert_store_items << trust_ca_file_or_hashed_dir
  change_notify
end

#add_trust_ca_to_store(cert_store, trust_ca_file_or_hashed_dir) ⇒ Object 



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# File 'lib/httpclient/ssl_config.rb', line 214

def add_trust_ca_to_store(cert_store, trust_ca_file_or_hashed_dir)
  if FileTest.directory?(trust_ca_file_or_hashed_dir)
    cert_store.add_path(trust_ca_file_or_hashed_dir)
  else
    cert_store.add_file(trust_ca_file_or_hashed_dir)
  end
end

#clear_cert_store ⇒ Object

Drops current certificate store (OpenSSL::X509::Store) for SSL and create new one for the next session.

Calling this method resets all existing sessions.



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# File 'lib/httpclient/ssl_config.rb', line 181

def clear_cert_store
  @cacerts_loaded = true # avoid lazy override
  @cert_store = X509::Store.new
  @cert_store_items.clear
  change_notify
end

#default_verify_callback(is_ok, ctx) ⇒ Object

Default callback for verification: only dumps error.



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# File 'lib/httpclient/ssl_config.rb', line 363

def default_verify_callback(is_ok, ctx)
  if $DEBUG
    if is_ok
      warn("ok: #{ctx.current_cert.subject.to_s.dump}")
    else
      warn("ng: #{ctx.current_cert.subject.to_s.dump} at depth #{ctx.error_depth} - #{ctx.error}: #{ctx.error_string} in #{ctx.chain.inspect}")
    end
    warn(ctx.current_cert.to_text)
    warn(ctx.current_cert.to_pem)
  end
  if !is_ok
    depth = ctx.error_depth
    code = ctx.error
    msg = ctx.error_string
    warn("at depth #{depth} - #{code}: #{msg}") if $DEBUG
  end
  is_ok
end

#load_trust_ca ⇒ Object

Loads default trust anchors. Calling this method resets all existing sessions.



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# File 'lib/httpclient/ssl_config.rb', line 224

def load_trust_ca
  load_cacerts(@cert_store)
  change_notify
end

#post_connection_check(peer_cert, hostname) ⇒ Object

post connection check proc for ruby < 1.8.5. this definition must match with the one in ext/openssl/lib/openssl/ssl.rb

Raises:

  • (SSL::SSLError) 


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# File 'lib/httpclient/ssl_config.rb', line 335

def post_connection_check(peer_cert, hostname) # :nodoc:
  check_common_name = true
  cert = peer_cert
  cert.extensions.each{|ext|
    next if ext.oid != "subjectAltName"
    ext.value.split(/,\s+/).each{|general_name|
      if /\ADNS:(.*)/ =~ general_name
        check_common_name = false
        reg = Regexp.escape($1).gsub(/\\\*/, "[^.]+")
        return true if /\A#{reg}\z/i =~ hostname
      elsif /\AIP Address:(.*)/ =~ general_name
        check_common_name = false
        return true if $1 == hostname
      end
    }
  }
  if check_common_name
    cert.subject.to_a.each{|oid, value|
      if oid == "CN"
        reg = Regexp.escape(value).gsub(/\\\*/, "[^.]+")
        return true if /\A#{reg}\z/i =~ hostname
      end
    }
  end
  raise SSL::SSLError, "hostname was not match with the server certificate"
end

#sample_verify_callback(is_ok, ctx) ⇒ Object

Sample callback method: CAUTION: does not check CRL/ARL.



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# File 'lib/httpclient/ssl_config.rb', line 383

def sample_verify_callback(is_ok, ctx)
  unless is_ok
    depth = ctx.error_depth
    code = ctx.error
    msg = ctx.error_string
    warn("at depth #{depth} - #{code}: #{msg}") if $DEBUG
    return false
  end

  cert = ctx.current_cert
  self_signed = false
  ca = false
  pathlen = nil
  server_auth = true
  self_signed = (cert.subject.cmp(cert.issuer) == 0)

  # Check extensions whatever its criticality is. (sample)
  cert.extensions.each do |ex|
    case ex.oid
    when 'basicConstraints'
      /CA:(TRUE|FALSE), pathlen:(\d+)/ =~ ex.value
      ca = ($1 == 'TRUE')
      pathlen = $2.to_i
    when 'keyUsage'
      usage = ex.value.split(/\s*,\s*/)
      ca = usage.include?('Certificate Sign')
      server_auth = usage.include?('Key Encipherment')
    when 'extendedKeyUsage'
      usage = ex.value.split(/\s*,\s*/)
      server_auth = usage.include?('Netscape Server Gated Crypto')
    when 'nsCertType'
      usage = ex.value.split(/\s*,\s*/)
      ca = usage.include?('SSL CA')
      server_auth = usage.include?('SSL Server')
    end
  end

  if self_signed
    warn('self signing CA') if $DEBUG
    return true
  elsif ca
    warn('middle level CA') if $DEBUG
    return true
  elsif server_auth
    warn('for server authentication') if $DEBUG
    return true
  end

  return false
end

#set_client_cert_file(cert_file, key_file, pass = nil) ⇒ Object

Sets certificate and private key for SSL client authentication.

cert_file

must be a filename of PEM/DER formatted file.

key_file

must be a filename of PEM/DER formatted file. Key must be an RSA key. If you want to use other PKey algorithm, use client_key=.

Calling this method resets all existing sessions.



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# File 'lib/httpclient/ssl_config.rb', line 153

def set_client_cert_file(cert_file, key_file, pass = nil)
  @client_cert, @client_key, @client_key_pass = cert_file, key_file, pass
  change_notify
end

#set_context(ctx) ⇒ Object

interfaces for SSLSocket.



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# File 'lib/httpclient/ssl_config.rb', line 309

def set_context(ctx) # :nodoc:
  load_trust_ca unless @cacerts_loaded
  @cacerts_loaded = true
  # Verification: Use Store#verify_callback instead of SSLContext#verify*?
  ctx.cert_store = @cert_store
  ctx.verify_mode = @verify_mode
  ctx.verify_depth = @verify_depth if @verify_depth
  ctx.verify_callback = @verify_callback || method(:default_verify_callback)
  # SSL config
  if @client_cert
    ctx.cert = @client_cert.is_a?(X509::Certificate) ?  @client_cert :
      X509::Certificate.new(File.open(@client_cert) { |f| f.read })
  end
  if @client_key
    ctx.key = @client_key.is_a?(PKey::PKey) ? @client_key :
      PKey::RSA.new(File.open(@client_key) { |f| f.read }, @client_key_pass)
  end
  ctx.client_ca = @client_ca
  ctx.timeout = @timeout
  ctx.options = @options
  ctx.ciphers = @ciphers
  ctx.ssl_version = @ssl_version unless @ssl_version == :auto
end

#set_default_paths ⇒ Object

Sets OpenSSL’s default trusted CA certificates. Generally, OpenSSL is configured to use OS’s trusted CA certificates located at /etc/pki/certs or /etc/ssl/certs. Unfortunately OpenSSL’s Windows build does not work with Windows Certificate Storage.

On Windows or when you build OpenSSL manually, you can set the CA certificates directory by SSL_CERT_DIR env variable at runtime.

SSL_CERT_DIR=/etc/ssl/certs ruby -rhttpclient -e "..."

Calling this method resets all existing sessions.



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# File 'lib/httpclient/ssl_config.rb', line 169

def set_default_paths
  @cacerts_loaded = true # avoid lazy override
  @cert_store = X509::Store.new
  @cert_store.set_default_paths
  @cert_store_items = [ENV['SSL_CERT_FILE'] || :default]
  change_notify
end