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Filename : cert_command.rb
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# frozen_string_literal: true
require_relative '../command'
require_relative '../security'

class Gem::Commands::CertCommand < Gem::Command
  def initialize
    super 'cert', 'Manage RubyGems certificates and signing settings',
          :add => [], :remove => [], :list => [], :build => [], :sign => []

    add_option('-a', '--add CERT',
               'Add a trusted certificate.') do |cert_file, options|
      options[:add] << open_cert(cert_file)
    end

    add_option('-l', '--list [FILTER]',
               'List trusted certificates where the',
               'subject contains FILTER') do |filter, options|
      filter ||= ''

      options[:list] << filter
    end

    add_option('-r', '--remove FILTER',
               'Remove trusted certificates where the',
               'subject contains FILTER') do |filter, options|
      options[:remove] << filter
    end

    add_option('-b', '--build EMAIL_ADDR',
               'Build private key and self-signed',
               'certificate for EMAIL_ADDR') do |email_address, options|
      options[:build] << email_address
    end

    add_option('-C', '--certificate CERT',
               'Signing certificate for --sign') do |cert_file, options|
      options[:issuer_cert] = open_cert(cert_file)
      options[:issuer_cert_file] = cert_file
    end

    add_option('-K', '--private-key KEY',
               'Key for --sign or --build') do |key_file, options|
      options[:key] = open_private_key(key_file)
    end

    add_option('-A', '--key-algorithm ALGORITHM',
               'Select which key algorithm to use for --build') do |algorithm, options|
      options[:key_algorithm] = algorithm
    end

    add_option('-s', '--sign CERT',
               'Signs CERT with the key from -K',
               'and the certificate from -C') do |cert_file, options|
      raise Gem::OptionParser::InvalidArgument, "#{cert_file}: does not exist" unless
        File.file? cert_file

      options[:sign] << cert_file
    end

    add_option('-d', '--days NUMBER_OF_DAYS',
               'Days before the certificate expires') do |days, options|
      options[:expiration_length_days] = days.to_i
    end

    add_option('-R', '--re-sign',
               'Re-signs the certificate from -C with the key from -K') do |resign, options|
      options[:resign] = resign
    end
  end

  def add_certificate(certificate) # :nodoc:
    Gem::Security.trust_dir.trust_cert certificate

    say "Added '#{certificate.subject}'"
  end

  def check_openssl
    return if Gem::HAVE_OPENSSL

    alert_error "OpenSSL library is required for the cert command"
    terminate_interaction 1
  end

  def open_cert(certificate_file)
    check_openssl
    OpenSSL::X509::Certificate.new File.read certificate_file
  rescue Errno::ENOENT
    raise Gem::OptionParser::InvalidArgument, "#{certificate_file}: does not exist"
  rescue OpenSSL::X509::CertificateError
    raise Gem::OptionParser::InvalidArgument,
      "#{certificate_file}: invalid X509 certificate"
  end

  def open_private_key(key_file)
    check_openssl
    passphrase = ENV['GEM_PRIVATE_KEY_PASSPHRASE']
    key = OpenSSL::PKey.read File.read(key_file), passphrase
    raise Gem::OptionParser::InvalidArgument,
      "#{key_file}: private key not found" unless key.private?
    key
  rescue Errno::ENOENT
    raise Gem::OptionParser::InvalidArgument, "#{key_file}: does not exist"
  rescue OpenSSL::PKey::PKeyError, ArgumentError
    raise Gem::OptionParser::InvalidArgument, "#{key_file}: invalid RSA, DSA, or EC key"
  end

  def execute
    check_openssl

    options[:add].each do |certificate|
      add_certificate certificate
    end

    options[:remove].each do |filter|
      remove_certificates_matching filter
    end

    options[:list].each do |filter|
      list_certificates_matching filter
    end

    options[:build].each do |email|
      build email
    end

    if options[:resign]
      re_sign_cert(
        options[:issuer_cert],
        options[:issuer_cert_file],
        options[:key]
      )
    end

    sign_certificates unless options[:sign].empty?
  end

  def build(email)
    if !valid_email?(email)
      raise Gem::CommandLineError, "Invalid email address #{email}"
    end

    key, key_path = build_key
    cert_path = build_cert email, key

    say "Certificate: #{cert_path}"

    if key_path
      say "Private Key: #{key_path}"
      say "Don't forget to move the key file to somewhere private!"
    end
  end

  def build_cert(email, key) # :nodoc:
    expiration_length_days = options[:expiration_length_days] ||
      Gem.configuration.cert_expiration_length_days

    cert = Gem::Security.create_cert_email(
      email,
      key,
      (Gem::Security::ONE_DAY * expiration_length_days)
    )

    Gem::Security.write cert, "gem-public_cert.pem"
  end

  def build_key # :nodoc:
    return options[:key] if options[:key]

    passphrase = ask_for_password 'Passphrase for your Private Key:'
    say "\n"

    passphrase_confirmation = ask_for_password 'Please repeat the passphrase for your Private Key:'
    say "\n"

    raise Gem::CommandLineError,
          "Passphrase and passphrase confirmation don't match" unless passphrase == passphrase_confirmation

    algorithm = options[:key_algorithm] || Gem::Security::DEFAULT_KEY_ALGORITHM
    key = Gem::Security.create_key(algorithm)
    key_path = Gem::Security.write key, "gem-private_key.pem", 0600, passphrase

    return key, key_path
  end

  def certificates_matching(filter)
    return enum_for __method__, filter unless block_given?

    Gem::Security.trusted_certificates.select do |certificate, _|
      subject = certificate.subject.to_s
      subject.downcase.index filter
    end.sort_by do |certificate, _|
      certificate.subject.to_a.map {|name, data,| [name, data] }
    end.each do |certificate, path|
      yield certificate, path
    end
  end

  def description # :nodoc:
    <<-EOF
The cert command manages signing keys and certificates for creating signed
gems.  Your signing certificate and private key are typically stored in
~/.gem/gem-public_cert.pem and ~/.gem/gem-private_key.pem respectively.

To build a certificate for signing gems:

  gem cert --build you@example

If you already have an RSA key, or are creating a new certificate for an
existing key:

  gem cert --build you@example --private-key /path/to/key.pem

If you wish to trust a certificate you can add it to the trust list with:

  gem cert --add /path/to/cert.pem

You can list trusted certificates with:

  gem cert --list

or:

  gem cert --list cert_subject_substring

If you wish to remove a previously trusted certificate:

  gem cert --remove cert_subject_substring

To sign another gem author's certificate:

  gem cert --sign /path/to/other_cert.pem

For further reading on signing gems see `ri Gem::Security`.
    EOF
  end

  def list_certificates_matching(filter) # :nodoc:
    certificates_matching filter do |certificate, _|
      # this could probably be formatted more gracefully
      say certificate.subject.to_s
    end
  end

  def load_default_cert
    cert_file = File.join Gem.default_cert_path
    cert = File.read cert_file
    options[:issuer_cert] = OpenSSL::X509::Certificate.new cert
  rescue Errno::ENOENT
    alert_error \
      "--certificate not specified and ~/.gem/gem-public_cert.pem does not exist"

    terminate_interaction 1
  rescue OpenSSL::X509::CertificateError
    alert_error \
      "--certificate not specified and ~/.gem/gem-public_cert.pem is not valid"

    terminate_interaction 1
  end

  def load_default_key
    key_file = File.join Gem.default_key_path
    key = File.read key_file
    passphrase = ENV['GEM_PRIVATE_KEY_PASSPHRASE']
    options[:key] = OpenSSL::PKey.read key, passphrase

  rescue Errno::ENOENT
    alert_error \
      "--private-key not specified and ~/.gem/gem-private_key.pem does not exist"

    terminate_interaction 1
  rescue OpenSSL::PKey::PKeyError
    alert_error \
      "--private-key not specified and ~/.gem/gem-private_key.pem is not valid"

    terminate_interaction 1
  end

  def load_defaults # :nodoc:
    load_default_cert unless options[:issuer_cert]
    load_default_key  unless options[:key]
  end

  def remove_certificates_matching(filter) # :nodoc:
    certificates_matching filter do |certificate, path|
      FileUtils.rm path
      say "Removed '#{certificate.subject}'"
    end
  end

  def sign(cert_file)
    cert = File.read cert_file
    cert = OpenSSL::X509::Certificate.new cert

    permissions = File.stat(cert_file).mode & 0777

    issuer_cert = options[:issuer_cert]
    issuer_key = options[:key]

    cert = Gem::Security.sign cert, issuer_key, issuer_cert

    Gem::Security.write cert, cert_file, permissions
  end

  def sign_certificates # :nodoc:
    load_defaults unless options[:sign].empty?

    options[:sign].each do |cert_file|
      sign cert_file
    end
  end

  def re_sign_cert(cert, cert_path, private_key)
    Gem::Security::Signer.re_sign_cert(cert, cert_path, private_key) do |expired_cert_path, new_expired_cert_path|
      alert("Your certificate #{expired_cert_path} has been re-signed")
      alert("Your expired certificate will be located at: #{new_expired_cert_path}")
    end
  end

  private

  def valid_email?(email)
    # It's simple, but is all we need
    email =~ /\A.+@.+\z/
  end
end