Class: Above::Certs

Inherits:
Object
  • Object
show all
Defined in:
lib/above/certs.rb

Overview

Create and load certificates

Instance Method Summary collapse

Instance Method Details

#create(domain_arr:, dir:, duration: 60 * 60 * 24 * 365) ⇒ Object

Create key & cert for domain in directory, with a one year duration



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# File 'lib/above/certs.rb', line 26

def create(domain_arr:, dir:, duration: 60 * 60 * 24 * 365)
  # RSA is new & length, not generate & algo
  key = OpenSSL::PKey::EC.generate("secp384r1")
  name = OpenSSL::X509::Name.parse("/CN=#{domain_arr.first}")

  time = Time.now
  cert = OpenSSL::X509::Certificate.new
  cert.version = 2
  cert.serial = 0
  cert.not_before = time
  cert.not_after = time + duration
  # RSA is key.public_key not key - why are they different!?
  cert.public_key = key
  cert.subject = name

  extension_factory = OpenSSL::X509::ExtensionFactory.new(nil, cert)
  cert.add_extension \
    extension_factory.create_extension("basicConstraints", "CA:FALSE", true)
  cert.add_extension \
    extension_factory.create_extension(
      "keyUsage", "nonRepudiation, digitalSignature, keyEncipherment"
    )
  dns_str = ""
  domain_arr.each do |domain|
    dns_str += "DNS:#{domain},"
  end
  dns_str.chomp!(",")
  cert.add_extension \
    extension_factory.create_extension(
      "subjectAltName", dns_str
    )
  cert.add_extension \
    extension_factory.create_extension(
      "extendedKeyUsage", "serverAuth, clientAuth"
    )
  cert.add_extension extension_factory.create_extension("subjectKeyIdentifier", "hash")

  cert.issuer = name
  cert.sign key, OpenSSL::Digest.new("SHA512")

  File.write(File.join(dir, "#{domain_arr.first}.crt"), cert.to_pem)
  File.write(File.join(dir, "#{domain_arr.first}.key"), key.to_pem)
end

#dane(domain_arr:, dir:) ⇒ Object 



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# File 'lib/above/certs.rb', line 8

def dane(domain_arr:, dir:)
  file = File.read("#{File.join(dir, domain_arr.first)}.crt")
  cert = OpenSSL::X509::Certificate.new(file)
  checksum = OpenSSL::Digest::SHA512.new(cert.to_der)
  puts "For DANE create:\n\n"
  domain_arr.each do |domain|
    puts "DNS record: _1965._tcp.#{domain}\n"
  end
  puts <<~HELP

    Each with the text: TLSA 3 1 2 #{checksum}

    312 meaning the certificate's self signed, check the public cert, against this SHA-512 hash
    See: https://en.wikipedia.org/wiki/DNS-based_Authentication_of_Named_Entities
  HELP
end