Module: OpenSSL::SSL

Defined in:
ossl_ssl.c,
lib/openssl/ssl.rb,
ossl_ssl.c,
ossl_ssl_session.c

Overview

Use SSLContext to set up the parameters for a TLS (former SSL) connection. Both client and server TLS connections are supported, SSLSocket and SSLServer may be used in conjunction with an instance of SSLContext to set up connections.

Defined Under Namespace

Modules: Nonblock, SocketForwarder Classes: SSLContext, SSLError, SSLErrorWaitReadable, SSLErrorWaitWritable, SSLServer, SSLSocket, Session

Class Method Summary collapse

Class Method Details

.verify_certificate_identity(cert, hostname) ⇒ Object


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# File 'lib/openssl/ssl.rb', line 136

def verify_certificate_identity(cert, hostname)
  should_verify_common_name = true
  cert.extensions.each{|ext|
    next if ext.oid != "subjectAltName"
    ostr = OpenSSL::ASN1.decode(ext.to_der).value.last
    sequence = OpenSSL::ASN1.decode(ostr.value)
    sequence.value.each{|san|
      case san.tag
      when 2 # dNSName in GeneralName (RFC5280)
        should_verify_common_name = false
        return true if verify_hostname(hostname, san.value)
      when 7 # iPAddress in GeneralName (RFC5280)
        should_verify_common_name = false
        # follows GENERAL_NAME_print() in x509v3/v3_alt.c
        if san.value.size == 4
          return true if san.value.unpack('C*').join('.') == hostname
        elsif san.value.size == 16
          return true if san.value.unpack('n*').map { |e| sprintf("%X", e) }.join(':') == hostname
        end
      end
    }
  }
  if should_verify_common_name
    cert.subject.to_a.each{|oid, value|
      if oid == "CN"
        return true if verify_hostname(hostname, value)
      end
    }
  end
  return false
end

.verify_hostname(hostname, san) ⇒ Object

:nodoc:


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# File 'lib/openssl/ssl.rb', line 169

def verify_hostname(hostname, san) # :nodoc:
  # RFC 5280, IA5String is limited to the set of ASCII characters
  return false unless san.ascii_only?
  return false unless hostname.ascii_only?

  # See RFC 6125, section 6.4.1
  # Matching is case-insensitive.
  san_parts = san.downcase.split(".")

  # TODO: this behavior should probably be more strict
  return san == hostname if san_parts.size < 2

  # Matching is case-insensitive.
  host_parts = hostname.downcase.split(".")

  # RFC 6125, section 6.4.3, subitem 2.
  # If the wildcard character is the only character of the left-most
  # label in the presented identifier, the client SHOULD NOT compare
  # against anything but the left-most label of the reference
  # identifier (e.g., *.example.com would match foo.example.com but
  # not bar.foo.example.com or example.com).
  return false unless san_parts.size == host_parts.size

  # RFC 6125, section 6.4.3, subitem 1.
  # The client SHOULD NOT attempt to match a presented identifier in
  # which the wildcard character comprises a label other than the
  # left-most label (e.g., do not match bar.*.example.net).
  return false unless verify_wildcard(host_parts.shift, san_parts.shift)

  san_parts.join(".") == host_parts.join(".")
end

.verify_wildcard(domain_component, san_component) ⇒ Object

:nodoc:


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# File 'lib/openssl/ssl.rb', line 202

def verify_wildcard(domain_component, san_component) # :nodoc:
  parts = san_component.split("*", -1)

  return false if parts.size > 2
  return san_component == domain_component if parts.size == 1

  # RFC 6125, section 6.4.3, subitem 3.
  # The client SHOULD NOT attempt to match a presented identifier
  # where the wildcard character is embedded within an A-label or
  # U-label of an internationalized domain name.
  return false if domain_component.start_with?("xn--") && san_component != "*"

  parts[0].length + parts[1].length < domain_component.length &&
  domain_component.start_with?(parts[0]) &&
  domain_component.end_with?(parts[1])
end