class Gem::Security::TrustDir

The TrustDir manages the trusted certificates for gem signature verification.

Constants

DEFAULT_PERMISSIONS: Default permissions for the trust directory and its contents

Attributes

dir [R]

The directory where trusted certificates will be stored.

Public Class Methods

new (dir, permissions = DEFAULT_PERMISSIONS)

Creates a new TrustDir using dir where the directory and file permissions will be checked according to permissions

# File lib/rubygems/security/trust_dir.rb, line 25
def initialize(dir, permissions = DEFAULT_PERMISSIONS)
  @dir = dir
  @permissions = permissions

  @digester = Gem::Security.create_digest
end

Public Instance Methods

cert_path (certificate)

Returns the path to the trusted certificate

# File lib/rubygems/security/trust_dir.rb, line 35
def cert_path(certificate)
  name_path certificate.subject
end

each_certificate () { |certificate, certificate_file| ... }

Enumerates trusted certificates.

# File lib/rubygems/security/trust_dir.rb, line 42
def each_certificate
  return enum_for __method__ unless block_given?

  glob = File.join @dir, "*.pem"

  Dir[glob].each do |certificate_file|
    certificate = load_certificate certificate_file

    yield certificate, certificate_file
  rescue OpenSSL::X509::CertificateError
    next # HACK: warn
  end
end

issuer_of (certificate)

Returns the issuer certificate of the given certificate if it exists in the trust directory.

# File lib/rubygems/security/trust_dir.rb, line 60
def issuer_of(certificate)
  path = name_path certificate.issuer

  return unless File.exist? path

  load_certificate path
end

load_certificate (certificate_file)

Loads the given certificate_file

# File lib/rubygems/security/trust_dir.rb, line 80
def load_certificate(certificate_file)
  pem = File.read certificate_file

  OpenSSL::X509::Certificate.new pem
end

name_path (name)

Returns the path to the trusted certificate with the given ASN.1 name

# File lib/rubygems/security/trust_dir.rb, line 71
def name_path(name)
  digest = @digester.hexdigest name.to_s

  File.join @dir, "cert-#{digest}.pem"
end

trust_cert (certificate)

Add a certificate to trusted certificate list.

# File lib/rubygems/security/trust_dir.rb, line 89
def trust_cert(certificate)
  verify

  destination = cert_path certificate

  File.open destination, "wb", 0o600 do |io|
    io.write certificate.to_pem
    io.chmod(@permissions[:trusted_cert])
  end
end

verify ()

Make sure the trust directory exists. If it does exist, make sure it’s actually a directory. If not, then create it with the appropriate permissions.

# File lib/rubygems/security/trust_dir.rb, line 105
def verify
  require "fileutils"
  if File.exist? @dir
    raise Gem::Security::Exception,
      "trust directory #{@dir} is not a directory" unless
        File.directory? @dir

    FileUtils.chmod 0o700, @dir
  else
    FileUtils.mkdir_p @dir, mode: @permissions[:trust_dir]
  end
end