Module: OverSIP::TLS

Extended by:
Logger
Defined in:
lib/oversip/tls.rb

Constant Summary collapse

TLS_PEM_CHAIN_REGEXP = 
/-{5}BEGIN CERTIFICATE-{5}\n.*?-{5}END CERTIFICATE-{5}\n/m

Class Method Summary collapse

Methods included from Logger

fg_system_msg2str, load_methods, log_id

Class Method Details

.get_sip_identities(cert) ⇒ Object 



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# File 'lib/oversip/tls.rb', line 127

def self.get_sip_identities cert
  return []  unless cert

  verify_subjectAltName_DNS = true
  verify_CN = true
  subjectAltName_URI_sip_entries = []
  subjectAltName_DNS_entries = []
  sip_identities = {}

  cert.extensions.each do |ext|
    next if ext.oid != "subjectAltName"
    verify_CN = false

    ext.value.split(/,\s+/).each do |name|
      if /^URI:sip:([^@]*)/i =~ name
        verify_subjectAltName_DNS = false
        subjectAltName_URI_sip_entries << $1.downcase
      elsif verify_subjectAltName_DNS && /^DNS:(.*)/i =~ name
        subjectAltName_DNS_entries << $1.downcase
      end
    end
  end

  unless verify_CN
    unless verify_subjectAltName_DNS
      subjectAltName_URI_sip_entries.each {|domain| sip_identities[domain] = true}
    else
      subjectAltName_DNS_entries.each {|domain| sip_identities[domain] = true}
    end

  else
    cert.subject.to_a.each do |oid, value|
      if oid == "CN"
        sip_identities[value.downcase] = true
        break
      end
    end
  end

  # Return an array with the SIP identities (domains) in the certificate.
  return sip_identities.keys
end

.module_init ⇒ Object 



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# File 'lib/oversip/tls.rb', line 12

def self.module_init
  configuration = ::OverSIP.configuration
  if configuration[:tls][:public_cert] and configuration[:tls][:private_cert]
    log_system_info "TLS enabled"
    ::OverSIP.tls_public_cert = configuration[:tls][:public_cert]
    ::OverSIP.tls_private_cert = configuration[:tls][:private_cert]
  else
    log_system_info "TLS disabled"
    return
  end

  if (ca_dir = configuration[:tls][:ca_dir])
    @store = ::OpenSSL::X509::Store.new
    num_certs_added = 0

    ::Dir.chdir ca_dir
    ca_files = ::Dir["*"]
    ca_files.select! { |ca_file| ::File.file?(ca_file) and ::File.readable?(ca_file) }
    ca_files.each do |ca_file|
      log_system_info "inspecting CA file '#{ca_file}'..."

      ca_file_content = ::File.read(ca_file)
      unless ca_file_content.valid_encoding?
        log_system_error "ignoring '#{ca_file}', invalid symbols found"
        next
      end

      pems = ca_file_content.scan(TLS_PEM_CHAIN_REGEXP).flatten
      num_pems = pems.size

      if num_pems == 0
        log_system_warn "'#{ca_file}': no public certificates found"
        next
      end
      log_system_info "'#{ca_file}': #{num_pems} public certificates found"

      now = ::Time.now
      certs = []
      pems.each do |pem|
        begin
          certs << ::OpenSSL::X509::Certificate.new(pem)
        rescue => e
          log_system_error "ignoring invalid X509 certificate: #{e.message} (#{e.class})"
          num_pems -= 1
        end
      end

      certs.reject! { |cert| cert.not_after < now }
      if certs.size != num_pems
        log_system_info "'#{ca_file}': ignoring #{num_pems - certs.size} expired certificates"
      end

      certs.each do |cert|
        begin
          @store.add_cert cert
          num_certs_added += 1
        # This occurs when a certificate is repeated.
        rescue ::OpenSSL::X509::StoreError => e
          log_system_warn "'#{ca_file}': ignoring certificate: #{e.message} (#{e.class})"
        end
      end
    end

    if num_certs_added == 0
      log_system_notice "zero public certificates found in '#{ca_dir}' directory, disabling TLS validation"
      @store = nil
    end
    log_system_info "#{num_certs_added} public certificates available for TLS validation"
  end

end

.validate(pems) ⇒ Object

Return an array with the result of the TLS certificate validation as follows:

cert, validated, tls_error, tls_error_string

where:

  • cert: the ::OpenSSL::X509::Certificate instance of the first PEM provided by

    the peer, nil otherwise.

  • validated: true if the given certificate(s) have been validated, false otherwise

    and nil if no certificate is provided by peer or no CA's were configured
for TLS validation.

  • tls_error: OpenSSL validation error code (Fixnum) in case of validation error.

  • tls_error_string: OpenSSL validation error string in case of validation error.



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# File 'lib/oversip/tls.rb', line 95

def self.validate pems
  return nil, nil, nil, "no CAs provided, validation disabled"  unless @store
  return nil, false, nil, "no certificate provided by peer"  unless pems.any?

  pem = pems.pop
  intermediate_pems = pems

  begin
    cert = ::OpenSSL::X509::Certificate.new pem

    if intermediate_pems and intermediate_pems.any?
      intermediate_certs = []
      intermediate_pems.each do |pem|
        intermediate_certs << ::OpenSSL::X509::Certificate.new(pem)
      end
    else
      intermediate_certs = nil
    end

    if @store.verify cert, intermediate_certs
      return cert, true
    else
      return cert, false, @store.error, @store.error_string
    end

  rescue => e
    log_system_error "exception validating a certificate: #{e.class}: #{e.message}"
    return nil, false, e.class, e.message
  end
end