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Fix unbounded recursion in post discovery (#23506)

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* Add a limit to how many posts can get fetched as a result of a single request

* Add tests

* Always pass `request_id` when processing `Announce` activities

---------

Co-authored-by: nametoolong <nametoolong@users.noreply.github.com>
This commit is contained in:
Claire 2023-02-10 22:16:37 +01:00 • committed by GitHub
commit 0c9eac80d8
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12 changed files with 126 additions and 22 deletions
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7
app/lib/activitypub/activity.rb
View file

@ -106,7 +106,8 @@ class ActivityPub::Activity
actor_id = value_or_id(first_of_value(@object['attributedTo']))
if actor_id == @account.uri
return ActivityPub::Activity.factory({ 'type' => 'Create', 'actor' => actor_id, 'object' => @object }, @account).perform
virtual_object = { 'type' => 'Create', 'actor' => actor_id, 'object' => @object }
return ActivityPub::Activity.factory(virtual_object, @account, request_id: @options[:request_id]).perform
end
end
@ -152,9 +153,9 @@ class ActivityPub::Activity
def fetch_remote_original_status
if object_uri.start_with?('http')
return if ActivityPub::TagManager.instance.local_uri?(object_uri)
ActivityPub::FetchRemoteStatusService.new.call(object_uri, id: true, on_behalf_of: @account.followers.local.first)
ActivityPub::FetchRemoteStatusService.new.call(object_uri, id: true, on_behalf_of: @account.followers.local.first, request_id: @options[:request_id])
elsif @object['url'].present?
::FetchRemoteStatusService.new.call(@object['url'])
::FetchRemoteStatusService.new.call(@object['url'], request_id: @options[:request_id])
end
end

6
app/lib/activitypub/activity/create.rb
View file

@ -327,18 +327,18 @@ class ActivityPub::Activity::Create < ActivityPub::Activity
def resolve_thread(status)
return unless status.reply? && status.thread.nil? && Request.valid_url?(in_reply_to_uri)
ThreadResolveWorker.perform_async(status.id, in_reply_to_uri)
ThreadResolveWorker.perform_async(status.id, in_reply_to_uri, { 'request_id' => @options[:request_id]})
end
def fetch_replies(status)
collection = @object['replies']
return if collection.nil?
replies = ActivityPub::FetchRepliesService.new.call(status, collection, false)
replies = ActivityPub::FetchRepliesService.new.call(status, collection, allow_synchronous_requests: false, request_id: @options[:request_id])
return unless replies.nil?
uri = value_or_id(collection)
ActivityPub::FetchRepliesWorker.perform_async(status.id, uri) unless uri.nil?
ActivityPub::FetchRepliesWorker.perform_async(status.id, uri, { 'request_id' => @options[:request_id]}) unless uri.nil?
end
def conversation_from_uri(uri)

13
app/services/activitypub/fetch_remote_status_service.rb
View file

@ -2,10 +2,13 @@
class ActivityPub::FetchRemoteStatusService < BaseService
include JsonLdHelper
include Redisable
DISCOVERIES_PER_REQUEST = 1000
# Should be called when uri has already been checked for locality
def call(uri, id: true, prefetched_body: nil, on_behalf_of: nil, expected_actor_uri: nil, request_id: nil)
@request_id = request_id
@request_id = request_id || "#{Time.now.utc.to_i}-status-#{uri}"
@json = begin
if prefetched_body.nil?
fetch_resource(uri, id, on_behalf_of)
@ -42,7 +45,13 @@ class ActivityPub::FetchRemoteStatusService < BaseService
# activity as an update rather than create
activity_json['type'] = 'Update' if equals_or_includes_any?(activity_json['type'], %w(Create)) && Status.where(uri: object_uri, account_id: actor.id).exists?
ActivityPub::Activity.factory(activity_json, actor, request_id: request_id).perform
with_redis do |redis|
discoveries = redis.incr("status_discovery_per_request:#{@request_id}")
redis.expire("status_discovery_per_request:#{@request_id}", 5.minutes.seconds)
return nil if discoveries > DISCOVERIES_PER_REQUEST
end
ActivityPub::Activity.factory(activity_json, actor, request_id: @request_id).perform
end
private

4
app/services/activitypub/fetch_replies_service.rb
View file

@ -3,14 +3,14 @@
class ActivityPub::FetchRepliesService < BaseService
include JsonLdHelper
def call(parent_status, collection_or_uri, allow_synchronous_requests = true)
def call(parent_status, collection_or_uri, allow_synchronous_requests: true, request_id: nil)
@account = parent_status.account
@allow_synchronous_requests = allow_synchronous_requests
@items = collection_items(collection_or_uri)
return if @items.nil?
FetchReplyWorker.push_bulk(filtered_replies)
FetchReplyWorker.push_bulk(filtered_replies) { |reply_uri| [reply_uri, { 'request_id' => request_id}] }
@items
end

4
app/services/fetch_remote_status_service.rb
View file

@ -1,7 +1,7 @@
# frozen_string_literal: true
class FetchRemoteStatusService < BaseService
def call(url, prefetched_body = nil)
def call(url, prefetched_body: nil, request_id: nil)
if prefetched_body.nil?
resource_url, resource_options = FetchResourceService.new.call(url)
else
@ -9,6 +9,6 @@ class FetchRemoteStatusService < BaseService
resource_options = { prefetched_body: prefetched_body }
end
ActivityPub::FetchRemoteStatusService.new.call(resource_url, **resource_options) unless resource_url.nil?
ActivityPub::FetchRemoteStatusService.new.call(resource_url, **resource_options.merge(request_id: request_id)) unless resource_url.nil?
end
end

2
app/services/resolve_url_service.rb
View file

@ -25,7 +25,7 @@ class ResolveURLService < BaseService
if equals_or_includes_any?(type, ActivityPub::FetchRemoteActorService::SUPPORTED_TYPES)
ActivityPub::FetchRemoteActorService.new.call(resource_url, prefetched_body: body)
elsif equals_or_includes_any?(type, ActivityPub::Activity::Create::SUPPORTED_TYPES + ActivityPub::Activity::Create::CONVERTED_TYPES)
status = FetchRemoteStatusService.new.call(resource_url, body)
status = FetchRemoteStatusService.new.call(resource_url, prefetched_body: body)
authorize_with @on_behalf_of, status, :show? unless status.nil?
status
end

4
app/workers/activitypub/fetch_replies_worker.rb
View file

@ -6,8 +6,8 @@ class ActivityPub::FetchRepliesWorker
sidekiq_options queue: 'pull', retry: 3
def perform(parent_status_id, replies_uri)
ActivityPub::FetchRepliesService.new.call(Status.find(parent_status_id), replies_uri)
def perform(parent_status_id, replies_uri, options = {})
ActivityPub::FetchRepliesService.new.call(Status.find(parent_status_id), replies_uri, **options.deep_symbolize_keys)
rescue ActiveRecord::RecordNotFound
true
end

4
app/workers/fetch_reply_worker.rb
View file

@ -6,7 +6,7 @@ class FetchReplyWorker
sidekiq_options queue: 'pull', retry: 3
def perform(child_url)
FetchRemoteStatusService.new.call(child_url)
def perform(child_url, options = {})
FetchRemoteStatusService.new.call(child_url, **options.deep_symbolize_keys)
end
end

4
app/workers/thread_resolve_worker.rb
View file

@ -6,9 +6,9 @@ class ThreadResolveWorker
sidekiq_options queue: 'pull', retry: 3
def perform(child_status_id, parent_url)
def perform(child_status_id, parent_url, options = {})
child_status = Status.find(child_status_id)
parent_status = FetchRemoteStatusService.new.call(parent_url)
parent_status = FetchRemoteStatusService.new.call(parent_url, **options.deep_symbolize_keys)
return if parent_status.nil?

4
spec/lib/activitypub/activity/add_spec.rb
View file

@ -48,7 +48,7 @@ RSpec.describe ActivityPub::Activity::Add do
end
it 'fetches the status and pins it' do
allow(service_stub).to receive(:call) do |uri, id: true, on_behalf_of: nil|
allow(service_stub).to receive(:call) do |uri, id: true, on_behalf_of: nil, request_id: nil|
expect(uri).to eq 'https://example.com/unknown'
expect(id).to eq true
expect(on_behalf_of&.following?(sender)).to eq true
@ -62,7 +62,7 @@ RSpec.describe ActivityPub::Activity::Add do
context 'when there is no local follower' do
it 'tries to fetch the status' do
allow(service_stub).to receive(:call) do |uri, id: true, on_behalf_of: nil|
allow(service_stub).to receive(:call) do |uri, id: true, on_behalf_of: nil, request_id: nil|
expect(uri).to eq 'https://example.com/unknown'
expect(id).to eq true
expect(on_behalf_of).to eq nil

94
spec/services/activitypub/fetch_remote_status_service_spec.rb
View file

@ -223,4 +223,98 @@ RSpec.describe ActivityPub::FetchRemoteStatusService, type: :service do
end
end
end
context 'statuses referencing other statuses' do
before do
stub_const 'ActivityPub::FetchRemoteStatusService::DISCOVERIES_PER_REQUEST', 5
end
context 'using inReplyTo' do
let(:object) do
{
'@context': 'https://www.w3.org/ns/activitystreams',
id: "https://foo.bar/@foo/1",
type: 'Note',
content: 'Lorem ipsum',
inReplyTo: 'https://foo.bar/@foo/2',
attributedTo: ActivityPub::TagManager.instance.uri_for(sender),
}
end
before do
8.times do |i|
status_json = {
'@context': 'https://www.w3.org/ns/activitystreams',
id: "https://foo.bar/@foo/#{i}",
type: 'Note',
content: 'Lorem ipsum',
inReplyTo: "https://foo.bar/@foo/#{i + 1}",
attributedTo: ActivityPub::TagManager.instance.uri_for(sender),
to: 'as:Public',
}.with_indifferent_access
stub_request(:get, "https://foo.bar/@foo/#{i}").to_return(status: 200, body: status_json.to_json, headers: { 'Content-Type': 'application/activity+json' })
end
end
it 'creates at least some statuses' do
expect { subject.call(object[:id], prefetched_body: Oj.dump(object)) }.to change { sender.statuses.count }.by_at_least(2)
end
it 'creates no more account than the limit allows' do
expect { subject.call(object[:id], prefetched_body: Oj.dump(object)) }.to change { sender.statuses.count }.by_at_most(5)
end
end
context 'using replies' do
let(:object) do
{
'@context': 'https://www.w3.org/ns/activitystreams',
id: "https://foo.bar/@foo/1",
type: 'Note',
content: 'Lorem ipsum',
replies: {
type: 'Collection',
id: 'https://foo.bar/@foo/1/replies',
first: {
type: 'CollectionPage',
partOf: 'https://foo.bar/@foo/1/replies',
items: ['https://foo.bar/@foo/2'],
},
},
attributedTo: ActivityPub::TagManager.instance.uri_for(sender),
}
end
before do
8.times do |i|
status_json = {
'@context': 'https://www.w3.org/ns/activitystreams',
id: "https://foo.bar/@foo/#{i}",
type: 'Note',
content: 'Lorem ipsum',
replies: {
type: 'Collection',
id: "https://foo.bar/@foo/#{i}/replies",
first: {
type: 'CollectionPage',
partOf: "https://foo.bar/@foo/#{i}/replies",
items: ["https://foo.bar/@foo/#{i+1}"],
},
},
attributedTo: ActivityPub::TagManager.instance.uri_for(sender),
to: 'as:Public',
}.with_indifferent_access
stub_request(:get, "https://foo.bar/@foo/#{i}").to_return(status: 200, body: status_json.to_json, headers: { 'Content-Type': 'application/activity+json' })
end
end
it 'creates at least some statuses' do
expect { subject.call(object[:id], prefetched_body: Oj.dump(object)) }.to change { sender.statuses.count }.by_at_least(2)
end
it 'creates no more account than the limit allows' do
expect { subject.call(object[:id], prefetched_body: Oj.dump(object)) }.to change { sender.statuses.count }.by_at_most(5)
end
end
end
end

2
spec/services/fetch_remote_status_service_spec.rb
View file

@ -15,7 +15,7 @@ RSpec.describe FetchRemoteStatusService, type: :service do
end
context 'protocol is :activitypub' do
subject { described_class.new.call(note[:id], prefetched_body) }
subject { described_class.new.call(note[:id], prefetched_body: prefetched_body) }
let(:prefetched_body) { Oj.dump(note) }
before do