refactor(smime): do not include OpenSSL to avoid name conflicts within specs

lib/gitlab/email/smime/certificate.rb

@@ -4,8 +4,6 @@ module Gitlab
   module Email
     module Smime
       class Certificate
-        include OpenSSL
-
         attr_reader :key, :cert
 
         def key_string
@@ -17,8 +15,8 @@ module Gitlab
         end
 
         def self.from_strings(key_string, cert_string)
-          key = PKey::RSA.new(key_string)
-          cert = X509::Certificate.new(cert_string)
+          key = OpenSSL::PKey::RSA.new(key_string)
+          cert = OpenSSL::X509::Certificate.new(cert_string)
           new(key, cert)
         end
 

lib/gitlab/email/smime/signer.rb

@@ -7,8 +7,6 @@ module Gitlab
     module Smime
       # Tooling for signing and verifying data with SMIME
       class Signer
-        include OpenSSL
-
         def self.sign(cert:, key:, data:)
           signed_data = PKCS7.sign(cert, key, data, nil, PKCS7::DETACHED)
           PKCS7.write_smime(signed_data)
@@ -16,11 +14,11 @@ module Gitlab
 
         # return nil if data cannot be verified, otherwise the signed content data
         def self.verify_signature(cert:, ca_cert: nil, signed_data:)
-          store = X509::Store.new
+          store = OpenSSL::X509::Store.new
           store.set_default_paths
           store.add_cert(ca_cert) if ca_cert
 
-          signed_smime = PKCS7.read_smime(signed_data)
+          signed_smime = OpenSSL::PKCS7.read_smime(signed_data)
           signed_smime if signed_smime.verify([cert], store)
         end
       end

spec/support/helpers/smime_helper.rb

 # frozen_string_literal: true
 
 module SmimeHelper
-  include OpenSSL
-
   INFINITE_EXPIRY = 1000.years
   SHORT_EXPIRY = 30.minutes
 
@@ -20,12 +18,12 @@ module SmimeHelper
     public_key = key.public_key
 
     subject = if certificate_authority
-                X509::Name.parse("/CN=EU")
+                OpenSSL::X509::Name.parse("/CN=EU")
               else
-                X509::Name.parse("/CN=#{email_address}")
+                OpenSSL::X509::Name.parse("/CN=#{email_address}")
               end
 
-    cert = X509::Certificate.new
+    cert = OpenSSL::X509::Certificate.new
     cert.subject = subject
 
     cert.issuer = signed_by&.fetch(:cert, nil)&.subject || subject
@@ -36,7 +34,7 @@ module SmimeHelper
     cert.serial = 0x0
     cert.version = 2
 
-    extension_factory = X509::ExtensionFactory.new
+    extension_factory = OpenSSL::X509::ExtensionFactory.new
     if certificate_authority
       extension_factory.subject_certificate = cert
       extension_factory.issuer_certificate = cert
@@ -50,7 +48,7 @@ module SmimeHelper
       cert.add_extension(extension_factory.create_extension('extendedKeyUsage', 'clientAuth,emailProtection', false))
     end
 
-    cert.sign(signed_by&.fetch(:key, nil) || key, Digest::SHA256.new)
+    cert.sign(signed_by&.fetch(:key, nil) || key, OpenSSL::Digest::SHA256.new)
 
     { key: key, cert: cert }
   end