From f100e843725cc6e2dfdbb6dc2b1bfc2fa939bb63 Mon Sep 17 00:00:00 2001 From: Eugen Rochko Date: Wed, 22 Aug 2018 20:55:14 +0200 Subject: [PATCH] Improve federated ID validation (#8372) * Fix URI not being sufficiently validated with prefetched JSON * Add additional id validation to OStatus documents, when possible --- app/helpers/jsonld_helper.rb | 6 ++- app/lib/ostatus/activity/creation.rb | 11 +++- .../fetch_remote_account_service.rb | 2 +- .../activitypub/fetch_remote_key_service.rb | 2 +- .../fetch_remote_status_service.rb | 2 +- app/services/fetch_remote_account_service.rb | 7 ++- .../fetch_remote_account_service_spec.rb | 7 ++- .../fetch_remote_status_service_spec.rb | 22 ++++++++ .../fetch_remote_account_service_spec.rb | 20 ++++++- .../fetch_remote_status_service_spec.rb | 52 +++++++++++++++++++ 10 files changed, 122 insertions(+), 9 deletions(-) diff --git a/app/helpers/jsonld_helper.rb b/app/helpers/jsonld_helper.rb index 9d2b6cf00..532397272 100644 --- a/app/helpers/jsonld_helper.rb +++ b/app/helpers/jsonld_helper.rb @@ -73,8 +73,10 @@ module JsonLdHelper end end - def body_to_json(body) - body.is_a?(String) ? Oj.load(body, mode: :strict) : body + def body_to_json(body, compare_id: nil) + json = body.is_a?(String) ? Oj.load(body, mode: :strict) : body + return if compare_id.present? && json['id'] != compare_id + json rescue Oj::ParseError nil end diff --git a/app/lib/ostatus/activity/creation.rb b/app/lib/ostatus/activity/creation.rb index d3a303a0c..8f8c70052 100644 --- a/app/lib/ostatus/activity/creation.rb +++ b/app/lib/ostatus/activity/creation.rb @@ -7,7 +7,7 @@ class OStatus::Activity::Creation < OStatus::Activity::Base return [nil, false] end - return [nil, false] if @account.suspended? + return [nil, false] if @account.suspended? || invalid_origin? RedisLock.acquire(lock_options) do |lock| if lock.acquired? @@ -204,6 +204,15 @@ class OStatus::Activity::Creation < OStatus::Activity::Base end end + def invalid_origin? + return false unless id.start_with?('http') # Legacy IDs cannot be checked + + needle = Addressable::URI.parse(id).normalized_host + + !(needle.casecmp(@account.domain).zero? || + needle.casecmp(Addressable::URI.parse(@account.remote_url.presence || @account.uri).normalized_host).zero?) + end + def lock_options { redis: Redis.current, key: "create:#{id}" } end diff --git a/app/services/activitypub/fetch_remote_account_service.rb b/app/services/activitypub/fetch_remote_account_service.rb index 867e70876..6fa4e9a1b 100644 --- a/app/services/activitypub/fetch_remote_account_service.rb +++ b/app/services/activitypub/fetch_remote_account_service.rb @@ -11,7 +11,7 @@ class ActivityPub::FetchRemoteAccountService < BaseService @json = if prefetched_body.nil? fetch_resource(uri, id) else - body_to_json(prefetched_body) + body_to_json(prefetched_body, compare_id: id ? uri : nil) end return unless supported_context? && expected_type? diff --git a/app/services/activitypub/fetch_remote_key_service.rb b/app/services/activitypub/fetch_remote_key_service.rb index 505baccd4..df17d9079 100644 --- a/app/services/activitypub/fetch_remote_key_service.rb +++ b/app/services/activitypub/fetch_remote_key_service.rb @@ -17,7 +17,7 @@ class ActivityPub::FetchRemoteKeyService < BaseService @json = fetch_resource(uri, id) end else - @json = body_to_json(prefetched_body) + @json = body_to_json(prefetched_body, compare_id: id ? uri : nil) end return unless supported_context?(@json) && expected_type? diff --git a/app/services/activitypub/fetch_remote_status_service.rb b/app/services/activitypub/fetch_remote_status_service.rb index 2b447abb3..469821032 100644 --- a/app/services/activitypub/fetch_remote_status_service.rb +++ b/app/services/activitypub/fetch_remote_status_service.rb @@ -8,7 +8,7 @@ class ActivityPub::FetchRemoteStatusService < BaseService @json = if prefetched_body.nil? fetch_resource(uri, id, on_behalf_of) else - body_to_json(prefetched_body) + body_to_json(prefetched_body, compare_id: id ? uri : nil) end return unless supported_context? && expected_type? diff --git a/app/services/fetch_remote_account_service.rb b/app/services/fetch_remote_account_service.rb index a0f031a44..cfc560022 100644 --- a/app/services/fetch_remote_account_service.rb +++ b/app/services/fetch_remote_account_service.rb @@ -27,7 +27,7 @@ class FetchRemoteAccountService < BaseService account = author_from_xml(xml.at_xpath('/xmlns:feed', xmlns: OStatus::TagManager::XMLNS), false) - UpdateRemoteProfileService.new.call(xml, account) unless account.nil? + UpdateRemoteProfileService.new.call(xml, account) if account.present? && trusted_domain?(url, account) account rescue TypeError @@ -37,4 +37,9 @@ class FetchRemoteAccountService < BaseService Rails.logger.debug 'Invalid XML or missing namespace' nil end + + def trusted_domain?(url, account) + domain = Addressable::URI.parse(url).normalized_host + domain.casecmp(account.domain).zero? || domain.casecmp(Addressable::URI.parse(account.remote_url.presence || account.uri).normalized_host).zero? + end end diff --git a/spec/services/activitypub/fetch_remote_account_service_spec.rb b/spec/services/activitypub/fetch_remote_account_service_spec.rb index dba55c034..aa13f0a9b 100644 --- a/spec/services/activitypub/fetch_remote_account_service_spec.rb +++ b/spec/services/activitypub/fetch_remote_account_service_spec.rb @@ -59,7 +59,6 @@ RSpec.describe ActivityPub::FetchRemoteAccountService, type: :service do it 'returns nil' do expect(account).to be_nil end - end context 'when URI and WebFinger share the same host' do @@ -119,5 +118,11 @@ RSpec.describe ActivityPub::FetchRemoteAccountService, type: :service do include_examples 'sets profile data' end + + context 'with wrong id' do + it 'does not create account' do + expect(subject.call('https://fake.address/@foo', prefetched_body: Oj.dump(actor))).to be_nil + end + end end end diff --git a/spec/services/activitypub/fetch_remote_status_service_spec.rb b/spec/services/activitypub/fetch_remote_status_service_spec.rb index 549eb80fa..9ae409996 100644 --- a/spec/services/activitypub/fetch_remote_status_service_spec.rb +++ b/spec/services/activitypub/fetch_remote_status_service_spec.rb @@ -70,5 +70,27 @@ RSpec.describe ActivityPub::FetchRemoteStatusService, type: :service do expect(strip_tags(status.text)).to eq "Nyan Cat 10 hours remix https://#{valid_domain}/watch?v=12345" end end + + context 'with wrong id' do + let(:note) do + { + '@context': 'https://www.w3.org/ns/activitystreams', + id: "https://real.address/@foo/1234", + type: 'Note', + content: 'Lorem ipsum', + attributedTo: ActivityPub::TagManager.instance.uri_for(sender), + } + end + + let(:object) do + temp = note.dup + temp[:id] = 'https://fake.address/@foo/5678' + temp + end + + it 'does not create status' do + expect(sender.statuses.first).to be_nil + end + end end end diff --git a/spec/services/fetch_remote_account_service_spec.rb b/spec/services/fetch_remote_account_service_spec.rb index 1c3abe8f3..20dd505d0 100644 --- a/spec/services/fetch_remote_account_service_spec.rb +++ b/spec/services/fetch_remote_account_service_spec.rb @@ -1,7 +1,7 @@ require 'rails_helper' RSpec.describe FetchRemoteAccountService, type: :service do - let(:url) { 'https://example.com' } + let(:url) { 'https://example.com/alice' } let(:prefetched_body) { nil } let(:protocol) { :ostatus } subject { FetchRemoteAccountService.new.call(url, prefetched_body, protocol) } @@ -46,6 +46,24 @@ RSpec.describe FetchRemoteAccountService, type: :service do end include_examples 'return Account' + + it 'does not update account information if XML comes from an unverified domain' do + feed_xml = <<-XML.squish + + + + http://activitystrea.ms/schema/1.0/person + http://kickass.zone/users/localhost + localhost + localhost + Villain!!! + + + XML + + returned_account = described_class.new.call('https://real-fake-domains.com/alice', feed_xml, :ostatus) + expect(returned_account.display_name).to_not eq 'Villain!!!' + end end context 'when prefetched_body is nil' do diff --git a/spec/services/fetch_remote_status_service_spec.rb b/spec/services/fetch_remote_status_service_spec.rb index 0df9c329a..f9db024b9 100644 --- a/spec/services/fetch_remote_status_service_spec.rb +++ b/spec/services/fetch_remote_status_service_spec.rb @@ -32,4 +32,56 @@ RSpec.describe FetchRemoteStatusService, type: :service do expect(status.text).to eq 'Lorem ipsum' end end + + context 'protocol is :ostatus' do + subject { described_class.new } + + before do + Fabricate(:account, username: 'tracer', domain: 'real.domain', remote_url: 'https://real.domain/users/tracer') + end + + it 'does not create status with author at different domain' do + status_body = <<-XML.squish + + + tag:real.domain,2017-04-27:objectId=4487555:objectType=Status + 2017-04-27T13:49:25Z + 2017-04-27T13:49:25Z + http://activitystrea.ms/schema/1.0/note + http://activitystrea.ms/schema/1.0/post + + https://real.domain/users/tracer + http://activitystrea.ms/schema/1.0/person + https://real.domain/users/tracer + tracer + + Overwatch rocks + + XML + + expect(subject.call('https://fake.domain/foo', status_body, :ostatus)).to be_nil + end + + it 'does not create status with wrong id when id uses http format' do + status_body = <<-XML.squish + + + https://other-real.domain/statuses/123 + 2017-04-27T13:49:25Z + 2017-04-27T13:49:25Z + http://activitystrea.ms/schema/1.0/note + http://activitystrea.ms/schema/1.0/post + + https://real.domain/users/tracer + http://activitystrea.ms/schema/1.0/person + https://real.domain/users/tracer + tracer + + Overwatch rocks + + XML + + expect(subject.call('https://real.domain/statuses/456', status_body, :ostatus)).to be_nil + end + end end