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Improve federated ID validation (#8372) 

* Fix URI not being sufficiently validated with prefetched JSON

* Add additional id validation to OStatus documents, when possible
This commit is contained in:
Eugen Rochko 2018-08-22 20:55:14 +02:00 committed by GitHub
parent ad41806e53
commit 802cf6a4c5
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10 changed files with 122 additions and 9 deletions
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6
app/helpers/jsonld_helper.rb
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@ -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

11
app/lib/ostatus/activity/creation.rb
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@ -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

2
app/services/activitypub/fetch_remote_account_service.rb
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@ -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 if !supported_context? || !expected_type? || (break_on_redirect && @json['movedTo'].present?)

2
app/services/activitypub/fetch_remote_key_service.rb
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@ -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?

2
app/services/activitypub/fetch_remote_status_service.rb
View File

@ -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?

7
app/services/fetch_remote_account_service.rb
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@ -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

7
spec/services/activitypub/fetch_remote_account_service_spec.rb
View File

@ -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

22
spec/services/activitypub/fetch_remote_status_service_spec.rb
View File

@ -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

20
spec/services/fetch_remote_account_service_spec.rb
View File

@ -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
<?xml version="1.0" encoding="UTF-8"?>
<feed xml:lang="en-US" xmlns="http://www.w3.org/2005/Atom" xmlns:thr="http://purl.org/syndication/thread/1.0" xmlns:georss="http://www.georss.org/georss" xmlns:activity="http://activitystrea.ms/spec/1.0/" xmlns:media="http://purl.org/syndication/atommedia" xmlns:poco="http://portablecontacts.net/spec/1.0" xmlns:ostatus="http://ostatus.org/schema/1.0" xmlns:statusnet="http://status.net/schema/api/1/">
<author>
<activity:object-type>http://activitystrea.ms/schema/1.0/person</activity:object-type>
<uri>http://kickass.zone/users/localhost</uri>
<name>localhost</name>
<poco:preferredUsername>localhost</poco:preferredUsername>
<poco:displayName>Villain!!!</poco:displayName>
</author>
</feed>
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

52
spec/services/fetch_remote_status_service_spec.rb
View File

@ -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
<?xml version="1.0"?>
<entry xmlns="http://www.w3.org/2005/Atom" xmlns:thr="http://purl.org/syndication/thread/1.0" xmlns:activity="http://activitystrea.ms/spec/1.0/" xmlns:poco="http://portablecontacts.net/spec/1.0" xmlns:media="http://purl.org/syndication/atommedia" xmlns:ostatus="http://ostatus.org/schema/1.0" xmlns:mastodon="http://mastodon.social/schema/1.0">
<id>tag:real.domain,2017-04-27:objectId=4487555:objectType=Status</id>
<published>2017-04-27T13:49:25Z</published>
<updated>2017-04-27T13:49:25Z</updated>
<activity:object-type>http://activitystrea.ms/schema/1.0/note</activity:object-type>
<activity:verb>http://activitystrea.ms/schema/1.0/post</activity:verb>
<author>
<id>https://real.domain/users/tracer</id>
<activity:object-type>http://activitystrea.ms/schema/1.0/person</activity:object-type>
<uri>https://real.domain/users/tracer</uri>
<name>tracer</name>
</author>
<content type="html">Overwatch rocks</content>
</entry>
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
<?xml version="1.0"?>
<entry xmlns="http://www.w3.org/2005/Atom" xmlns:thr="http://purl.org/syndication/thread/1.0" xmlns:activity="http://activitystrea.ms/spec/1.0/" xmlns:poco="http://portablecontacts.net/spec/1.0" xmlns:media="http://purl.org/syndication/atommedia" xmlns:ostatus="http://ostatus.org/schema/1.0" xmlns:mastodon="http://mastodon.social/schema/1.0">
<id>https://other-real.domain/statuses/123</id>
<published>2017-04-27T13:49:25Z</published>
<updated>2017-04-27T13:49:25Z</updated>
<activity:object-type>http://activitystrea.ms/schema/1.0/note</activity:object-type>
<activity:verb>http://activitystrea.ms/schema/1.0/post</activity:verb>
<author>
<id>https://real.domain/users/tracer</id>
<activity:object-type>http://activitystrea.ms/schema/1.0/person</activity:object-type>
<uri>https://real.domain/users/tracer</uri>
<name>tracer</name>
</author>
<content type="html">Overwatch rocks</content>
</entry>
XML
expect(subject.call('https://real.domain/statuses/456', status_body, :ostatus)).to be_nil
end
end
end