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Extract authorization policy for viewing statuses (#3150)

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This commit is contained in:
Jack Jennings
2017-05-29 09:22:22 -07:00
committed by Eugen Rochko
parent 9a81be0d37
commit 3a2003ba86
16 changed files with 155 additions and 80 deletions
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1
Gemfile
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@@ -38,6 +38,7 @@ gem 'nokogiri', '~> 1.7'
gem 'oj', '~> 3.0'
gem 'ostatus2', '~> 2.0'
gem 'ox', '~> 2.5'
gem 'pundit', '~> 1.1'
gem 'rabl', '~> 0.13'
gem 'rack-attack', '~> 5.0'
gem 'rack-cors', '~> 0.4', require: 'rack/cors'

3
Gemfile.lock
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@@ -283,6 +283,8 @@ GEM
pry (>= 0.10.4)
public_suffix (2.0.5)
puma (3.8.2)
pundit (1.1.0)
activesupport (>= 3.0.0)
rabl (0.13.1)
activesupport (>= 2.3.14)
rack (2.0.3)
@@ -519,6 +521,7 @@ DEPENDENCIES
pkg-config (~> 1.2)
pry-rails (~> 0.3)
puma (~> 3.8)
pundit (~> 1.1)
rabl (~> 0.13)
rack-attack (~> 5.0)
rack-cors (~> 0.4)

4
app/controllers/api/activitypub/activities_controller.rb
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@@ -1,6 +1,8 @@
# frozen_string_literal: true
class Api::Activitypub::ActivitiesController < ApiController
include Authorization
# before_action :set_follow, only: [:show_follow]
before_action :set_status, only: [:show_status]
@@ -8,7 +10,7 @@ class Api::Activitypub::ActivitiesController < ApiController
# Show a status in AS2 format, as either an Announce (reblog) or a Create (post) activity.
def show_status
return forbidden unless @status.permitted?
authorize @status, :show?
if @status.reblog?
render :show_status_announce

4
app/controllers/api/activitypub/notes_controller.rb
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@@ -1,12 +1,14 @@
# frozen_string_literal: true
class Api::Activitypub::NotesController < ApiController
include Authorization
before_action :set_status
respond_to :activitystreams2
def show
forbidden unless @status.permitted?
authorize @status, :show?
end
private

7
app/controllers/api/v1/statuses_controller.rb
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@@ -1,6 +1,8 @@
# frozen_string_literal: true
class Api::V1::StatusesController < ApiController
include Authorization
before_action :authorize_if_got_token, except: [:create, :destroy, :reblog, :unreblog, :favourite, :unfavourite, :mute, :unmute]
before_action -> { doorkeeper_authorize! :write }, only: [:create, :destroy, :reblog, :unreblog, :favourite, :unfavourite, :mute, :unmute]
before_action :require_user!, except: [:show, :context, :card, :reblogged_by, :favourited_by]
@@ -130,7 +132,10 @@ class Api::V1::StatusesController < ApiController
def set_status
@status = Status.find(params[:id])
raise ActiveRecord::RecordNotFound unless @status.permitted?(current_account)
authorize @status, :show?
rescue Mastodon::NotPermittedError
# Reraise in order to get a 404 instead of a 403 error code
raise ActiveRecord::RecordNotFound
end
def set_conversation

22
app/controllers/concerns/authorization.rb Normal file
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@@ -0,0 +1,22 @@
# frozen_string_literal: true
module Authorization
extend ActiveSupport::Concern
include Pundit
def pundit_user
current_account
end
def authorize(*)
super
rescue Pundit::NotAuthorizedError
raise Mastodon::NotPermittedError
end
def authorize_with(user, record, query)
Pundit.authorize(user, record, query)
rescue Pundit::NotAuthorizedError
raise Mastodon::NotPermittedError
end
end

7
app/controllers/media_controller.rb
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@@ -1,6 +1,8 @@
# frozen_string_literal: true
class MediaController < ApplicationController
include Authorization
before_action :verify_permitted_status
def show
@@ -14,6 +16,9 @@ class MediaController < ApplicationController
end
def verify_permitted_status
raise ActiveRecord::RecordNotFound unless media_attachment.status.permitted?(current_account)
authorize media_attachment.status, :show?
rescue Mastodon::NotPermittedError
# Reraise in order to get a 404 instead of a 403 error code
raise ActiveRecord::RecordNotFound
end
end

7
app/controllers/statuses_controller.rb
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@@ -1,6 +1,8 @@
# frozen_string_literal: true
class StatusesController < ApplicationController
include Authorization
layout 'public'
before_action :set_account
@@ -30,7 +32,10 @@ class StatusesController < ApplicationController
@stream_entry = @status.stream_entry
@type = @stream_entry.activity_type.downcase
raise ActiveRecord::RecordNotFound unless @status.permitted?(current_account)
authorize @status, :show?
rescue Mastodon::NotPermittedError
# Reraise in order to get a 404
raise ActiveRecord::RecordNotFound
end
def check_account_suspension

8
app/controllers/stream_entries_controller.rb
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@@ -1,6 +1,8 @@
# frozen_string_literal: true
class StreamEntriesController < ApplicationController
include Authorization
layout 'public'
before_action :set_account
@@ -42,7 +44,11 @@ class StreamEntriesController < ApplicationController
@stream_entry = @account.stream_entries.where(activity_type: 'Status').find(params[:id])
@type = @stream_entry.activity_type.downcase
raise ActiveRecord::RecordNotFound if @stream_entry.activity.nil? || (@stream_entry.hidden? && !@stream_entry.activity.permitted?(current_account))
raise ActiveRecord::RecordNotFound if @stream_entry.activity.nil?
authorize @stream_entry.activity, :show? if @stream_entry.hidden?
rescue Mastodon::NotPermittedError
# Reraise in order to get a 404
raise ActiveRecord::RecordNotFound
end
def check_account_suspension

12
app/models/status.rb
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@@ -113,16 +113,6 @@ class Status < ApplicationRecord
private_visibility? || direct_visibility?
end
def permitted?(other_account = nil)
if direct_visibility?
account.id == other_account&.id || mentions.where(account: other_account).exists?
elsif private_visibility?
account.id == other_account&.id || other_account&.following?(account) || mentions.where(account: other_account).exists?
else
other_account.nil? || !account.blocking?(other_account)
end
end
def ancestors(account = nil)
ids = Rails.cache.fetch("ancestors:#{id}") { (Status.find_by_sql(['WITH RECURSIVE search_tree(id, in_reply_to_id, path) AS (SELECT id, in_reply_to_id, ARRAY[id] FROM statuses WHERE id = ? UNION ALL SELECT statuses.id, statuses.in_reply_to_id, path || statuses.id FROM search_tree JOIN statuses ON statuses.id = search_tree.in_reply_to_id WHERE NOT statuses.id = ANY(path)) SELECT id FROM search_tree ORDER BY path DESC', id]) - [self]).pluck(:id) }
find_statuses_from_tree_path(ids, account)
@@ -301,7 +291,7 @@ class Status < ApplicationRecord
should_filter ||= account&.domain_blocking?(status.account.domain)
should_filter ||= account&.muting?(status.account_id)
should_filter ||= (status.account.silenced? && !account&.following?(status.account_id))
should_filter ||= !status.permitted?(account)
should_filter ||= !StatusPolicy.new(account, status).show?
should_filter
end
end

20
app/policies/status_policy.rb Normal file
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@@ -0,0 +1,20 @@
# frozen_string_literal: true
class StatusPolicy
attr_reader :account, :status
def initialize(account, status)
@account = account
@status = status
end
def show?
if status.direct_visibility?
status.account.id == account&.id || status.mentions.where(account: account).exists?
elsif status.private_visibility?
status.account.id == account&.id || account&.following?(status.account) || status.mentions.where(account: account).exists?
else
account.nil? || !status.account.blocking?(account)
end
end
end

4
app/services/favourite_service.rb
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@@ -1,12 +1,14 @@
# frozen_string_literal: true
class FavouriteService < BaseService
include Authorization
# Favourite a status and notify remote user
# @param [Account] account
# @param [Status] status
# @return [Favourite]
def call(account, status)
raise Mastodon::NotPermittedError unless status.permitted?(account)
authorize_with account, status, :show?
favourite = Favourite.create!(account: account, status: status)

4
app/services/reblog_service.rb
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@@ -1,6 +1,7 @@
# frozen_string_literal: true
class ReblogService < BaseService
include Authorization
include StreamEntryRenderer
# Reblog a status and notify its remote author
@@ -10,7 +11,8 @@ class ReblogService < BaseService
def call(account, reblogged_status)
reblogged_status = reblogged_status.reblog if reblogged_status.reblog?
raise Mastodon::NotPermittedError if reblogged_status.direct_visibility? || reblogged_status.private_visibility? || !reblogged_status.permitted?(account)
authorize_with account, reblogged_status, :show?
raise Mastodon::NotPermittedError if reblogged_status.direct_visibility? || reblogged_status.private_visibility?
reblog = account.statuses.create!(reblog: reblogged_status, text: '')

2
spec/controllers/media_controller_spec.rb
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@@ -30,7 +30,7 @@ describe MediaController do
it 'raises when not permitted to view' do
status = Fabricate(:status)
media_attachment = Fabricate(:media_attachment, status: status)
allow_any_instance_of(Status).to receive(:permitted?).and_return(false)
allow_any_instance_of(MediaController).to receive(:authorize).and_raise(ActiveRecord::RecordNotFound)
get :show, params: { id: media_attachment.to_param }
expect(response).to have_http_status(:missing)

60
spec/models/status_spec.rb
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@@ -119,66 +119,6 @@ RSpec.describe Status, type: :model do
end
end
describe '#permitted?' do
it 'returns true when direct and account is viewer' do
subject.visibility = :direct
expect(subject.permitted?(subject.account)).to be true
end
it 'returns true when direct and viewer is mentioned' do
subject.visibility = :direct
subject.mentions = [Fabricate(:mention, account: alice)]
expect(subject.permitted?(alice)).to be true
end
it 'returns false when direct and viewer is not mentioned' do
viewer = Fabricate(:account)
subject.visibility = :direct
expect(subject.permitted?(viewer)).to be false
end
it 'returns true when private and account is viewer' do
subject.visibility = :direct
expect(subject.permitted?(subject.account)).to be true
end
it 'returns true when private and account is following viewer' do
follow = Fabricate(:follow)
subject.visibility = :private
subject.account = follow.target_account
expect(subject.permitted?(follow.account)).to be true
end
it 'returns true when private and viewer is mentioned' do
subject.visibility = :private
subject.mentions = [Fabricate(:mention, account: alice)]
expect(subject.permitted?(alice)).to be true
end
it 'returns false when private and viewer is not mentioned or followed' do
viewer = Fabricate(:account)
subject.visibility = :private
expect(subject.permitted?(viewer)).to be false
end
it 'returns true when no viewer' do
expect(subject.permitted?).to be true
end
it 'returns false when viewer is blocked' do
block = Fabricate(:block)
subject.visibility = :private
subject.account = block.target_account
expect(subject.permitted?(block.account)).to be false
end
end
describe '#ancestors' do
let!(:alice) { Fabricate(:account, username: 'alice') }
let!(:bob) { Fabricate(:account, username: 'bob', domain: 'example.com') }

70
spec/policies/status_policy_spec.rb Normal file
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@@ -0,0 +1,70 @@
require 'rails_helper'
require 'pundit/rspec'
RSpec.describe StatusPolicy, type: :model do
subject { described_class }
let(:alice) { Fabricate(:account, username: 'alice') }
let(:status) { Fabricate(:status, account: alice) }
permissions :show? do
it 'grants access when direct and account is viewer' do
status.visibility = :direct
expect(subject).to permit(status.account, status)
end
it 'grants access when direct and viewer is mentioned' do
status.visibility = :direct
status.mentions = [Fabricate(:mention, account: alice)]
expect(subject).to permit(alice, status)
end
it 'denies access when direct and viewer is not mentioned' do
viewer = Fabricate(:account)
status.visibility = :direct
expect(subject).to_not permit(viewer, status)
end
it 'grants access when private and account is viewer' do
status.visibility = :direct
expect(subject).to permit(status.account, status)
end
it 'grants access when private and account is following viewer' do
follow = Fabricate(:follow)
status.visibility = :private
status.account = follow.target_account
expect(subject).to permit(follow.account, status)
end
it 'grants access when private and viewer is mentioned' do
status.visibility = :private
status.mentions = [Fabricate(:mention, account: alice)]
expect(subject).to permit(alice, status)
end
it 'denies access when private and viewer is not mentioned or followed' do
viewer = Fabricate(:account)
status.visibility = :private
expect(subject).to_not permit(viewer, status)
end
it 'grants access when no viewer' do
expect(subject).to permit(nil, status)
end
it 'denies access when viewer is blocked' do
block = Fabricate(:block)
status.visibility = :private
status.account = block.target_account
expect(subject).to_not permit(block.account, status)
end
end
end