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Dir : ~/usr/share/rubygems/rubygems/security/

Edit File: trust_dir.rb

# frozen_string_literal: true
##
# The TrustDir manages the trusted certificates for gem signature
# verification.

class Gem::Security::TrustDir
  ##
  # Default permissions for the trust directory and its contents

DEFAULT_PERMISSIONS = {
    :trust_dir    => 0700,
    :trusted_cert => 0600,
  }.freeze

##
  # The directory where trusted certificates will be stored.

attr_reader :dir

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

def initialize(dir, permissions = DEFAULT_PERMISSIONS)
    @dir = dir
    @permissions = permissions

@digester = Gem::Security.create_digest
  end

##
  # Returns the path to the trusted +certificate+

def cert_path(certificate)
    name_path certificate.subject
  end

##
  # Enumerates trusted certificates.

def each_certificate
    return enum_for __method__ unless block_given?

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

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

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

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

def issuer_of(certificate)
    path = name_path certificate.issuer

return unless File.exist? path

load_certificate path
  end

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

def name_path(name)
    digest = @digester.hexdigest name.to_s

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

##
  # Loads the given +certificate_file+

def load_certificate(certificate_file)
    pem = File.read certificate_file

OpenSSL::X509::Certificate.new pem
  end

##
  # Add a certificate to trusted certificate list.

def trust_cert(certificate)
    verify

destination = cert_path certificate

File.open destination, 'wb', 0600 do |io|
      io.write certificate.to_pem
      io.chmod(@permissions[:trusted_cert])
    end
  end

##
  # 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.

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 0700, @dir
    else
      FileUtils.mkdir_p @dir, :mode => @permissions[:trust_dir]
    end
  end
end