Revert "Merge branch 'if-57131-external_auth_to_ce' into 'master'"

This reverts merge request !26823

22 files changed, 10 insertions, 356 deletions

diff --git a/app/assets/stylesheets/pages/projects.scss b/app/assets/stylesheets/pages/projects.scss
index 79558b8604f..792c618fd40 100644
--- a/app/assets/stylesheets/pages/projects.scss
+++ b/app/assets/stylesheets/pages/projects.scss
@@ -67,10 +67,6 @@
   }
 }
 
-.classification-label {
-  background-color: $red-500;
-}
-
 .toggle-wrapper {
   margin-top: 5px;
 }
diff --git a/app/controllers/admin/application_settings_controller.rb b/app/controllers/admin/application_settings_controller.rb
index b681949ab36..ab792cf7403 100644
--- a/app/controllers/admin/application_settings_controller.rb
+++ b/app/controllers/admin/application_settings_controller.rb
@@ -124,9 +124,7 @@ class Admin::ApplicationSettingsController < Admin::ApplicationController
   end
 
   def visible_application_setting_attributes
-    [
-      *::ApplicationSettingsHelper.visible_attributes,
-      *::ApplicationSettingsHelper.external_authorization_service_attributes,
+    ApplicationSettingsHelper.visible_attributes + [
       :domain_blacklist_file,
       disabled_oauth_sign_in_sources: [],
       import_sources: [],
diff --git a/app/controllers/concerns/project_unauthorized.rb b/app/controllers/concerns/project_unauthorized.rb
index d42363b8b17..f59440dbc59 100644
--- a/app/controllers/concerns/project_unauthorized.rb
+++ b/app/controllers/concerns/project_unauthorized.rb
@@ -1,21 +1,10 @@
 # frozen_string_literal: true
 
 module ProjectUnauthorized
-  def project_unauthorized_proc
-    lambda do |project|
-      if project
-        label = project.external_authorization_classification_label
-        rejection_reason = nil
-
-        unless ::Gitlab::ExternalAuthorization.access_allowed?(current_user, label)
-          rejection_reason = ::Gitlab::ExternalAuthorization.rejection_reason(current_user, label)
-          rejection_reason ||= _('External authorization denied access to this project')
-        end
+  extend ActiveSupport::Concern
 
-        if rejection_reason
-          access_denied!(rejection_reason)
-        end
-      end
-    end
+  # EE would override this
+  def project_unauthorized_proc
+    # no-op
   end
 end
diff --git a/app/controllers/projects_controller.rb b/app/controllers/projects_controller.rb
index b7beac00eda..f76e6663995 100644
--- a/app/controllers/projects_controller.rb
+++ b/app/controllers/projects_controller.rb
@@ -343,7 +343,6 @@ class ProjectsController < Projects::ApplicationController
       :container_registry_enabled,
       :default_branch,
       :description,
-      :external_authorization_classification_label,
       :import_url,
       :issues_tracker,
       :issues_tracker_id,
diff --git a/app/helpers/application_settings_helper.rb b/app/helpers/application_settings_helper.rb
index 50b5edf7da4..e635f608237 100644
--- a/app/helpers/application_settings_helper.rb
+++ b/app/helpers/application_settings_helper.rb
@@ -119,39 +119,6 @@ module ApplicationSettingsHelper
     options_for_select(options, selected)
   end
 
-  def external_authorization_description
-    _("If enabled, access to projects will be validated on an external service"\
-        " using their classification label.")
-  end
-
-  def external_authorization_timeout_help_text
-    _("Time in seconds GitLab will wait for a response from the external "\
-        "service. When the service does not respond in time, access will be "\
-        "denied.")
-  end
-
-  def external_authorization_url_help_text
-    _("When leaving the URL blank, classification labels can still be "\
-        "specified without disabling cross project features or performing "\
-        "external authorization checks.")
-  end
-
-  def external_authorization_client_certificate_help_text
-    _("The X509 Certificate to use when mutual TLS is required to communicate "\
-        "with the external authorization service. If left blank, the server "\
-        "certificate is still validated when accessing over HTTPS.")
-  end
-
-  def external_authorization_client_key_help_text
-    _("The private key to use when a client certificate is provided. This value "\
-        "is encrypted at rest.")
-  end
-
-  def external_authorization_client_pass_help_text
-    _("The passphrase required to decrypt the private key. This is optional "\
-        "and the value is encrypted at rest.")
-  end
-
   def visible_attributes
     [
       :admin_notification_email,
@@ -270,18 +237,6 @@ module ApplicationSettingsHelper
     ]
   end
 
-  def external_authorization_service_attributes
-    [
-      :external_auth_client_cert,
-      :external_auth_client_key,
-      :external_auth_client_key_pass,
-      :external_authorization_service_default_label,
-      :external_authorization_service_enabled,
-      :external_authorization_service_timeout,
-      :external_authorization_service_url
-    ]
-  end
-
   def expanded_by_default?
     Rails.env.test?
   end
diff --git a/app/helpers/projects_helper.rb b/app/helpers/projects_helper.rb
index 2ac90eb8d9f..009dd70c2c9 100644
--- a/app/helpers/projects_helper.rb
+++ b/app/helpers/projects_helper.rb
@@ -303,16 +303,6 @@ module ProjectsHelper
     @path.present?
   end
 
-  def external_classification_label_help_message
-    default_label = ::Gitlab::CurrentSettings.current_application_settings
-                      .external_authorization_service_default_label
-
-    s_(
-      "ExternalAuthorizationService|When no classification label is set the "\
-        "default label `%{default_label}` will be used."
-    ) % { default_label: default_label }
-  end
-
   private
 
   def get_project_nav_tabs(project, current_user)
diff --git a/app/models/application_setting.rb b/app/models/application_setting.rb
index d28a12413bf..7ec8505b33a 100644
--- a/app/models/application_setting.rb
+++ b/app/models/application_setting.rb
@@ -213,40 +213,6 @@ class ApplicationSetting < ApplicationRecord
 
   validate :terms_exist, if: :enforce_terms?
 
-  validates :external_authorization_service_default_label,
-            presence: true,
-            if: :external_authorization_service_enabled
-
-  validates :external_authorization_service_url,
-            url: true, allow_blank: true,
-            if: :external_authorization_service_enabled
-
-  validates :external_authorization_service_timeout,
-            numericality: { greater_than: 0, less_than_or_equal_to: 10 },
-            if: :external_authorization_service_enabled
-
-  validates :external_auth_client_key,
-            presence: true,
-            if: -> (setting) { setting.external_auth_client_cert.present? }
-
-  validates_with X509CertificateCredentialsValidator,
-                 certificate: :external_auth_client_cert,
-                 pkey: :external_auth_client_key,
-                 pass: :external_auth_client_key_pass,
-                 if: -> (setting) { setting.external_auth_client_cert.present? }
-
-  attr_encrypted :external_auth_client_key,
-                 mode: :per_attribute_iv,
-                 key: Settings.attr_encrypted_db_key_base_truncated,
-                 algorithm: 'aes-256-gcm',
-                 encode: true
-
-  attr_encrypted :external_auth_client_key_pass,
-                 mode: :per_attribute_iv,
-                 key: Settings.attr_encrypted_db_key_base_truncated,
-                 algorithm: 'aes-256-gcm',
-                 encode: true
-
   before_validation :ensure_uuid!
   before_validation :strip_sentry_values
 
diff --git a/app/models/issue.rb b/app/models/issue.rb
index eb4c87e05d5..97c6dcc4745 100644
--- a/app/models/issue.rb
+++ b/app/models/issue.rb
@@ -230,13 +230,7 @@ class Issue < ApplicationRecord
   def visible_to_user?(user = nil)
     return false unless project && project.feature_available?(:issues, user)
 
-    return publicly_visible? unless user
-
-    return false unless readable_by?(user)
-
-    user.full_private_access? ||
-      ::Gitlab::ExternalAuthorization.access_allowed?(
-        user, project.external_authorization_classification_label)
+    user ? readable_by?(user) : publicly_visible?
   end
 
   def check_for_spam?
@@ -304,7 +298,7 @@ class Issue < ApplicationRecord
 
   # Returns `true` if this Issue is visible to everybody.
   def publicly_visible?
-    project.public? && !confidential? && !::Gitlab::ExternalAuthorization.enabled?
+    project.public? && !confidential?
   end
 
   def expire_etag_cache
diff --git a/app/models/project.rb b/app/models/project.rb
index 97e287d3fa2..e2869fc2ad5 100644
--- a/app/models/project.rb
+++ b/app/models/project.rb
@@ -2062,11 +2062,6 @@ class Project < ApplicationRecord
     fetch_branch_allows_collaboration(user, branch_name)
   end
 
-  def external_authorization_classification_label
-    super || ::Gitlab::CurrentSettings.current_application_settings
-               .external_authorization_service_default_label
-  end
-
   def licensed_features
     []
   end
diff --git a/app/policies/base_policy.rb b/app/policies/base_policy.rb
index 5dd2279ef99..72de04203a6 100644
--- a/app/policies/base_policy.rb
+++ b/app/policies/base_policy.rb
@@ -22,13 +22,6 @@ class BasePolicy < DeclarativePolicy::Base
     Gitlab::CurrentSettings.current_application_settings.restricted_visibility_levels.include?(Gitlab::VisibilityLevel::PUBLIC)
   end
 
-  condition(:external_authorization_enabled, scope: :global, score: 0) do
-    ::Gitlab::ExternalAuthorization.perform_check?
-  end
-
-  rule { external_authorization_enabled & ~full_private_access }.policy do
-    prevent :read_cross_project
-  end
-
+  # This is prevented in some cases in `gitlab-ee`
   rule { default }.enable :read_cross_project
 end
diff --git a/app/policies/project_policy.rb b/app/policies/project_policy.rb
index ba38af9c529..26d7d6e84c4 100644
--- a/app/policies/project_policy.rb
+++ b/app/policies/project_policy.rb
@@ -89,15 +89,6 @@ class ProjectPolicy < BasePolicy
     ::Gitlab::CurrentSettings.current_application_settings.mirror_available
   end
 
-  with_scope :subject
-  condition(:classification_label_authorized, score: 32) do
-    ::Gitlab::ExternalAuthorization.access_allowed?(
-      @user,
-      @subject.external_authorization_classification_label,
-      @subject.full_path
-    )
-  end
-
   # We aren't checking `:read_issue` or `:read_merge_request` in this case
   # because it could be possible for a user to see an issuable-iid
   # (`:read_issue_iid` or `:read_merge_request_iid`) but then wouldn't be
@@ -426,25 +417,6 @@ class ProjectPolicy < BasePolicy
 
   rule { ~can_have_multiple_clusters & has_clusters }.prevent :add_cluster
 
-  rule { ~can?(:read_cross_project) & ~classification_label_authorized }.policy do
-    # Preventing access here still allows the projects to be listed. Listing
-    # projects doesn't check the `:read_project` ability. But instead counts
-    # on the `project_authorizations` table.
-    #
-    # All other actions should explicitly check read project, which would
-    # trigger the `classification_label_authorized` condition.
-    #
-    # `:read_project_for_iids` is not prevented by this condition, as it is
-    # used for cross-project reference checks.
-    prevent :guest_access
-    prevent :public_access
-    prevent :public_user_access
-    prevent :reporter_access
-    prevent :developer_access
-    prevent :maintainer_access
-    prevent :owner_access
-  end
-
   private
 
   def team_member?
diff --git a/app/services/application_settings/update_service.rb b/app/services/application_settings/update_service.rb
index 7eeaf8aade1..9146eb96533 100644
--- a/app/services/application_settings/update_service.rb
+++ b/app/services/application_settings/update_service.rb
@@ -2,17 +2,9 @@
 
 module ApplicationSettings
   class UpdateService < ApplicationSettings::BaseService
-    include ValidatesClassificationLabel
-
     attr_reader :params, :application_setting
 
     def execute
-      validate_classification_label(application_setting, :external_authorization_service_default_label)
-
-      if application_setting.errors.any?
-        return false
-      end
-
       update_terms(@params.delete(:terms))
 
       if params.key?(:performance_bar_allowed_group_path)
diff --git a/app/services/concerns/validates_classification_label.rb b/app/services/concerns/validates_classification_label.rb
deleted file mode 100644
index ebcf5c24ff8..00000000000
--- a/app/services/concerns/validates_classification_label.rb
+++ /dev/null
@@ -1,27 +0,0 @@
-# frozen_string_literal: true
-
-module ValidatesClassificationLabel
-  def validate_classification_label(record, attribute_name)
-    return unless ::Gitlab::ExternalAuthorization.enabled?
-    return unless classification_label_change?(record, attribute_name)
-
-    new_label = params[attribute_name].presence
-    new_label ||= ::Gitlab::CurrentSettings.current_application_settings
-                    .external_authorization_service_default_label
-
-    unless ::Gitlab::ExternalAuthorization.access_allowed?(current_user, new_label)
-      reason = rejection_reason_for_label(new_label)
-      message = s_('ClassificationLabelUnavailable|is unavailable: %{reason}') % { reason: reason }
-      record.errors.add(attribute_name, message)
-    end
-  end
-
-  def rejection_reason_for_label(label)
-    reason_from_service = ::Gitlab::ExternalAuthorization.rejection_reason(current_user, label).presence
-    reason_from_service || _("Access to '%{classification_label}' not allowed") % { classification_label: label }
-  end
-
-  def classification_label_change?(record, attribute_name)
-    params.key?(attribute_name) || record.new_record?
-  end
-end
diff --git a/app/services/projects/create_service.rb b/app/services/projects/create_service.rb
index 3723c5ef7d7..d03137b63b2 100644
--- a/app/services/projects/create_service.rb
+++ b/app/services/projects/create_service.rb
@@ -2,8 +2,6 @@
 
 module Projects
   class CreateService < BaseService
-    include ValidatesClassificationLabel
-
     def initialize(user, params)
       @current_user, @params = user, params.dup
       @skip_wiki = @params.delete(:skip_wiki)
@@ -47,8 +45,6 @@ module Projects
       relations_block&.call(@project)
       yield(@project) if block_given?
 
-      validate_classification_label(@project, :external_authorization_classification_label)
-
       # If the block added errors, don't try to save the project
       return @project if @project.errors.any?
 
diff --git a/app/services/projects/update_service.rb b/app/services/projects/update_service.rb
index bc36bb8659d..6856009b395 100644
--- a/app/services/projects/update_service.rb
+++ b/app/services/projects/update_service.rb
@@ -3,7 +3,6 @@
 module Projects
   class UpdateService < BaseService
     include UpdateVisibilityLevel
-    include ValidatesClassificationLabel
 
     ValidationError = Class.new(StandardError)
 
@@ -15,8 +14,6 @@ module Projects
 
       yield if block_given?
 
-      validate_classification_label(project, :external_authorization_classification_label)
-
       # If the block added errors, don't try to save the project
       return update_failed! if project.errors.any?
 
diff --git a/app/validators/x509_certificate_credentials_validator.rb b/app/validators/x509_certificate_credentials_validator.rb
deleted file mode 100644
index d2f18e956c3..00000000000
--- a/app/validators/x509_certificate_credentials_validator.rb
+++ /dev/null
@@ -1,86 +0,0 @@
-# frozen_string_literal: true
-
-# X509CertificateCredentialsValidator
-#
-# Custom validator to check if certificate-attribute was signed using the
-# private key stored in an attrebute.
-#
-# This can be used as an `ActiveModel::Validator` as follows:
-#
-#   validates_with X509CertificateCredentialsValidator,
-#                  certificate: :client_certificate,
-#                  pkey: :decrypted_private_key,
-#                  pass: :decrypted_passphrase
-#
-#
-# Required attributes:
-# - certificate: The name of the accessor that returns the certificate to check
-# - pkey: The name of the accessor that returns the private key
-# Optional:
-# - pass: The name of the accessor that returns the passphrase to decrypt the
-#         private key
-class X509CertificateCredentialsValidator < ActiveModel::Validator
-  def initialize(*args)
-    super
-
-    # We can't validate if we don't have a private key or certificate attributes
-    # in which case this validator is useless.
-    if options[:pkey].nil? || options[:certificate].nil?
-      raise 'Provide at least `certificate` and `pkey` attribute names'
-    end
-  end
-
-  def validate(record)
-    unless certificate = read_certificate(record)
-      record.errors.add(options[:certificate], _('is not a valid X509 certificate.'))
-    end
-
-    unless private_key = read_private_key(record)
-      record.errors.add(options[:pkey], _('could not read private key, is the passphrase correct?'))
-    end
-
-    return if private_key.nil? || certificate.nil?
-
-    unless certificate.public_key.fingerprint == private_key.public_key.fingerprint
-      record.errors.add(options[:pkey], _('private key does not match certificate.'))
-    end
-  end
-
-  private
-
-  def read_private_key(record)
-    OpenSSL::PKey.read(pkey(record).to_s, pass(record).to_s)
-  rescue OpenSSL::PKey::PKeyError, ArgumentError
-    # When the primary key could not be read, an ArgumentError is raised.
-    # This hapens when the passed key is not valid or the passphrase is incorrect
-    nil
-  end
-
-  def read_certificate(record)
-    OpenSSL::X509::Certificate.new(certificate(record).to_s)
-  rescue OpenSSL::X509::CertificateError
-    nil
-  end
-
-  # rubocop:disable GitlabSecurity/PublicSend
-  #
-  # Allowing `#public_send` here because we don't want the validator to really
-  # care about the names of the attributes or where they come from.
-  #
-  # The credentials are mostly stored encrypted so we need to go through the
-  # accessors to get the values, `read_attribute` bypasses those.
-  def certificate(record)
-    record.public_send(options[:certificate])
-  end
-
-  def pkey(record)
-    record.public_send(options[:pkey])
-  end
-
-  def pass(record)
-    return unless options[:pass]
-
-    record.public_send(options[:pass])
-  end
-  # rubocop:enable GitlabSecurity/PublicSend
-end
diff --git a/app/views/admin/application_settings/_external_authorization_service_form.html.haml b/app/views/admin/application_settings/_external_authorization_service_form.html.haml
deleted file mode 100644
index 01f6c7afe61..00000000000
--- a/app/views/admin/application_settings/_external_authorization_service_form.html.haml
+++ /dev/null
@@ -1,51 +0,0 @@
-%section.settings.as-external-auth.no-animate#js-external-auth-settings{ class: ('expanded' if expanded) }
-  .settings-header
-    %h4
-      = _('External authentication')
-    %button.btn.js-settings-toggle{ type: 'button' }
-      = expanded ? 'Collapse' : 'Expand'
-    %p
-    = _('External Classification Policy Authorization')
-  .settings-content
-
-    = form_for @application_setting, url: admin_application_settings_path(anchor: 'js-external-auth-settings'), html: { class: 'fieldset-form' } do |f|
-      = form_errors(@application_setting)
-
-      %fieldset
-        .form-group
-          .form-check
-            = f.check_box :external_authorization_service_enabled, class: 'form-check-input'
-            = f.label :external_authorization_service_enabled, class: 'form-check-label' do
-              = _('Enable classification control using an external service')
-          %span.form-text.text-muted
-            = external_authorization_description
-            = link_to icon('question-circle'), help_page_path('user/admin_area/settings/external_authorization')
-        .form-group
-          = f.label :external_authorization_service_url, _('Service URL'), class: 'label-bold'
-          = f.text_field :external_authorization_service_url, class: 'form-control'
-          %span.form-text.text-muted
-            = external_authorization_url_help_text
-        .form-group
-          = f.label :external_authorization_service_timeout, _('External authorization request timeout'), class: 'label-bold'
-          = f.number_field :external_authorization_service_timeout, class: 'form-control', min: 0.001, max: 10, step: 0.001
-          %span.form-text.text-muted
-            = external_authorization_timeout_help_text
-          = f.label :external_auth_client_cert, _('Client authentication certificate'), class: 'label-bold'
-          = f.text_area :external_auth_client_cert, class: 'form-control'
-          %span.form-text.text-muted
-            = external_authorization_client_certificate_help_text
-        .form-group
-          = f.label :external_auth_client_key, _('Client authentication key'), class: 'label-bold'
-          = f.text_area :external_auth_client_key, class: 'form-control'
-          %span.form-text.text-muted
-            = external_authorization_client_key_help_text
-        .form-group
-          = f.label :external_auth_client_key_pass, _('Client authentication key password'), class: 'label-bold'
-          = f.password_field :external_auth_client_key_pass, class: 'form-control'
-          %span.form-text.text-muted
-            = external_authorization_client_pass_help_text
-        .form-group
-          = f.label :external_authorization_service_default_label, _('Default classification label'), class: 'label-bold'
-          = f.text_field :external_authorization_service_default_label, class: 'form-control'
-
-      = f.submit 'Save changes', class: "btn btn-success"
diff --git a/app/views/admin/application_settings/show.html.haml b/app/views/admin/application_settings/show.html.haml
index 31f18ba0d56..fc9dd29b8ca 100644
--- a/app/views/admin/application_settings/show.html.haml
+++ b/app/views/admin/application_settings/show.html.haml
@@ -68,7 +68,7 @@
   .settings-content
     = render 'terms'
 
-= render 'admin/application_settings/external_authorization_service_form', expanded: expanded_by_default?
+= render_if_exists 'admin/application_settings/external_authorization_service_form', expanded: expanded_by_default?
 
 %section.settings.as-terminal.no-animate#js-terminal-settings{ class: ('expanded' if expanded_by_default?) }
   .settings-header
diff --git a/app/views/layouts/_page.html.haml b/app/views/layouts/_page.html.haml
index 26a1f1e119c..1b2a4cd6780 100644
--- a/app/views/layouts/_page.html.haml
+++ b/app/views/layouts/_page.html.haml
@@ -7,7 +7,6 @@
     .alert-wrapper
       = render "layouts/broadcast"
       = render "layouts/header/read_only_banner"
-      = render "layouts/nav/classification_level_banner"
       = yield :flash_message
       = render "shared/ping_consent"
       - unless @hide_breadcrumbs
diff --git a/app/views/layouts/nav/_classification_level_banner.html.haml b/app/views/layouts/nav/_classification_level_banner.html.haml
deleted file mode 100644
index cc4caf079b8..00000000000
--- a/app/views/layouts/nav/_classification_level_banner.html.haml
+++ /dev/null
@@ -1,5 +0,0 @@
-- if ::Gitlab::ExternalAuthorization.enabled? && @project
-  = content_for :header_content do
-    %span.badge.color-label.classification-label.has-tooltip{ title: s_('ExternalAuthorizationService|Classification label') }
-      = sprite_icon('lock-open', size: 8, css_class: 'inline')
-      = @project.external_authorization_classification_label
diff --git a/app/views/projects/_classification_policy_settings.html.haml b/app/views/projects/_classification_policy_settings.html.haml
deleted file mode 100644
index 57c7a718d53..00000000000
--- a/app/views/projects/_classification_policy_settings.html.haml
+++ /dev/null
@@ -1,8 +0,0 @@
-- if ::Gitlab::ExternalAuthorization.enabled?
-  .form-group
-    = f.label :external_authorization_classification_label, class: 'label-bold' do
-      = s_('ExternalAuthorizationService|Classification Label')
-      %span.light (optional)
-    = f.text_field :external_authorization_classification_label, class: "form-control"
-    %span.form-text.text-muted
-      = external_classification_label_help_message
diff --git a/app/views/projects/edit.html.haml b/app/views/projects/edit.html.haml
index abf2fb7dc57..98017bea0c9 100644
--- a/app/views/projects/edit.html.haml
+++ b/app/views/projects/edit.html.haml
@@ -32,7 +32,7 @@
               %span.light (optional)
             = f.text_area :description, class: "form-control", rows: 3, maxlength: 250
 
-          = render 'projects/classification_policy_settings', f: f
+          = render_if_exists 'projects/classification_policy_settings', f: f
 
         = render_if_exists 'shared/repository_size_limit_setting', form: f, type: :project