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Improve shared status verification (#2525)

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* Instead of parsing shared status contents verbatim, make roundtrip
to purported original URL. Confirm that the "original" URL is from the
same domain as the author it claims to be from.

* Fix obvious typo, add comment

* Use URI look-up first

* Add test, update Goldfinger dependency to make less useless HTTP requests per Webfinger lookup
th-downstream
Eugen Rochko 8 years ago committed by GitHub
parent 64bef924ae
commit 97dff125a8
5 changed files with 126 additions and 41 deletions
Show Stats Download Patch File Download Diff File

4
Gemfile.lock
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@ -165,7 +165,7 @@ GEM
ruby-progressbar (~> 1.4)
globalid (0.3.7)
activesupport (>= 4.1.0)
goldfinger (1.1.2)
goldfinger (1.2.0)
addressable (~> 2.4)
http (~> 2.0)
nokogiri (~> 1.6)
@ -459,7 +459,7 @@ GEM
execjs (>= 0.3.0, < 3)
unf (0.1.4)
unf_ext
unf_ext (0.0.7.3)
unf_ext (0.0.7.4)
unicode-display_width (1.1.3)
uniform_notifier (1.10.0)
warden (1.2.7)

12
app/services/fetch_remote_status_service.rb
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@ -39,9 +39,19 @@ class FetchRemoteStatusService < BaseService
Rails.logger.debug "Going to webfinger #{username}@#{domain}"
return FollowRemoteAccountService.new.call("#{username}@#{domain}")
account = FollowRemoteAccountService.new.call("#{username}@#{domain}")
# If the author's confirmed URLs do not match the domain of the URL
# we are reading this from, abort
return nil unless confirmed_domain?(domain, account)
account
rescue Nokogiri::XML::XPath::SyntaxError
Rails.logger.debug 'Invalid XML or missing namespace'
nil
end
def confirmed_domain?(domain, account)
domain.casecmp(account.domain).zero? || domain.casecmp(Addressable::URI.parse(account.remote_url).normalize.host).zero?
end
end

12
app/services/process_feed_service.rb
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@ -47,8 +47,8 @@ class ProcessFeedService < BaseService
return status unless just_created
if verb == :share
original_status, = status_from_xml(@xml.at_xpath('.//activity:object', activity: TagManager::AS_XMLNS))
status.reblog = original_status
original_status = shared_status_from_xml(@xml.at_xpath('.//activity:object', activity: TagManager::AS_XMLNS))
status.reblog = original_status
if original_status.nil?
status.destroy
@ -90,6 +90,14 @@ class ProcessFeedService < BaseService
!([:post, :share, :delete].include?(verb) && [:activity, :note, :comment].include?(type))
end
def shared_status_from_xml(entry)
status = find_status(id(entry))
return status unless status.nil?
FetchRemoteStatusService.new.call(url(entry))
end
def status_from_xml(entry)
# Return early if status already exists in db
status = find_status(id(entry))

1
spec/services/follow_remote_account_service_spec.rb
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@ -5,6 +5,7 @@ RSpec.describe FollowRemoteAccountService do
before do
stub_request(:get, "https://quitter.no/.well-known/host-meta").to_return(request_fixture('.host-meta.txt'))
stub_request(:get, "https://example.com/.well-known/webfinger?resource=acct:catsrgr8@example.com").to_return(status: 404)
stub_request(:get, "https://example.com/.well-known/host-meta").to_return(status: 404)
stub_request(:get, "https://quitter.no/.well-known/webfinger?resource=acct:gargron@quitter.no").to_return(request_fixture('webfinger.txt'))
stub_request(:get, "https://quitter.no/.well-known/webfinger?resource=acct:catsrgr8@quitter.no").to_return(status: 404)

138
spec/services/process_feed_service_spec.rb
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@ -1,52 +1,118 @@
require 'rails_helper'
RSpec.describe ProcessFeedService do
let(:body) { File.read(File.join(Rails.root, 'spec', 'fixtures', 'xml', 'mastodon.atom')) }
let(:account) { Fabricate(:account, username: 'localhost', domain: 'kickass.zone') }
subject { ProcessFeedService.new }
before do
stub_request(:post, "https://pubsubhubbub.superfeedr.com/").to_return(:status => 200, :body => "", :headers => {})
stub_request(:get, "http://kickass.zone/system/accounts/avatars/000/000/001/large/eris.png").to_return(request_fixture('avatar.txt'))
stub_request(:get, "http://kickass.zone/system/media_attachments/files/000/000/002/original/morpheus_linux.jpg?1476059910").to_return(request_fixture('attachment1.txt'))
stub_request(:get, "http://kickass.zone/system/media_attachments/files/000/000/003/original/gizmo.jpg?1476060065").to_return(request_fixture('attachment2.txt'))
describe 'processing a feed' do
let(:body) { File.read(File.join(Rails.root, 'spec', 'fixtures', 'xml', 'mastodon.atom')) }
let(:account) { Fabricate(:account, username: 'localhost', domain: 'kickass.zone') }
subject.call(body, account)
end
before do
stub_request(:post, "https://pubsubhubbub.superfeedr.com/").to_return(:status => 200, :body => "", :headers => {})
stub_request(:get, "http://kickass.zone/system/accounts/avatars/000/000/001/large/eris.png").to_return(request_fixture('avatar.txt'))
stub_request(:get, "http://kickass.zone/system/media_attachments/files/000/000/002/original/morpheus_linux.jpg?1476059910").to_return(request_fixture('attachment1.txt'))
stub_request(:get, "http://kickass.zone/system/media_attachments/files/000/000/003/original/gizmo.jpg?1476060065").to_return(request_fixture('attachment2.txt'))
it 'updates remote user\'s account information' do
account.reload
expect(account.display_name).to eq '::1'
expect(account).to have_attached_file(:avatar)
end
subject.call(body, account)
end
it 'creates posts' do
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=1:objectType=Status')).to_not be_nil
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=2:objectType=Status')).to_not be_nil
end
it 'updates remote user\'s account information' do
account.reload
expect(account.display_name).to eq '::1'
expect(account).to have_attached_file(:avatar)
end
it 'ignores delete statuses unless they existed before' do
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=3:objectType=Status')).to be_nil
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=12:objectType=Status')).to be_nil
end
it 'creates posts' do
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=1:objectType=Status')).to_not be_nil
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=2:objectType=Status')).to_not be_nil
end
it 'does not create statuses for follows' do
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=1:objectType=Follow')).to be_nil
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=2:objectType=Follow')).to be_nil
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=4:objectType=Follow')).to be_nil
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=7:objectType=Follow')).to be_nil
end
it 'ignores delete statuses unless they existed before' do
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=3:objectType=Status')).to be_nil
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=12:objectType=Status')).to be_nil
end
it 'does not create statuses for follows' do
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=1:objectType=Follow')).to be_nil
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=2:objectType=Follow')).to be_nil
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=4:objectType=Follow')).to be_nil
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=7:objectType=Follow')).to be_nil
end
it 'does not create statuses for favourites' do
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=2:objectType=Favourite')).to be_nil
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=3:objectType=Favourite')).to be_nil
it 'does not create statuses for favourites' do
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=2:objectType=Favourite')).to be_nil
expect(Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=3:objectType=Favourite')).to be_nil
end
it 'creates posts with media' do
status = Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=14:objectType=Status')
expect(status).to_not be_nil
expect(status.media_attachments.first).to have_attached_file(:file)
end
end
it 'creates posts with media' do
status = Status.find_by(uri: 'tag:kickass.zone,2016-10-10:objectId=14:objectType=Status')
it 'does not accept tampered reblogs' do
good_actor = Fabricate(:account, username: 'tracer', domain: 'overwatch.com')
real_body = <<XML
<?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:overwatch.com,2017-04-27:objectId=4467137: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://overwatch.com/users/tracer</id>
<activity:object-type>http://activitystrea.ms/schema/1.0/person</activity:object-type>
<uri>https://overwatch.com/users/tracer</uri>
<name>tracer</name>
</author>
<content type="html">Overwatch rocks</content>
</entry>
XML
stub_request(:head, 'https://overwatch.com/users/tracer/updates/1').to_return(status: 200, headers: { 'Content-Type' => 'application/atom+xml' })
stub_request(:get, 'https://overwatch.com/users/tracer/updates/1').to_return(status: 200, body: real_body)
bad_actor = Fabricate(:account, username: 'sombra', domain: 'talon.xyz')
body = <<XML
<?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:talon.xyz,2017-04-27:objectId=4467137:objectType=Status</id>
<published>2017-04-27T13:49:25Z</published>
<updated>2017-04-27T13:49:25Z</updated>
<author>
<id>https://talon.xyz/users/sombra</id>
<activity:object-type>http://activitystrea.ms/schema/1.0/person</activity:object-type>
<uri>https://talon.xyz/users/sombra</uri>
<name>sombra</name>
</author>
<activity:object-type>http://activitystrea.ms/schema/1.0/activity</activity:object-type>
<activity:verb>http://activitystrea.ms/schema/1.0/share</activity:verb>
<content type="html">Overwatch SUCKS AHAHA</content>
<activity:object>
<id>tag:overwatch.com,2017-04-27:objectId=4467137:objectType=Status</id>
<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://overwatch.com/users/tracer</id>
<activity:object-type>http://activitystrea.ms/schema/1.0/person</activity:object-type>
<uri>https://overwatch.com/users/tracer</uri>
<name>tracer</name>
</author>
<content type="html">Overwatch SUCKS AHAHA</content>
<link rel="alternate" type="text/html" href="https://overwatch.com/users/tracer/updates/1" />
</activity:object>
</entry>
XML
created_statuses = subject.call(body, bad_actor)
expect(status).to_not be_nil
expect(status.media_attachments.first).to have_attached_file(:file)
expect(created_statuses.first.reblog?).to be true
expect(created_statuses.first.account_id).to eq bad_actor.id
expect(created_statuses.first.reblog.account_id).to eq good_actor.id
expect(created_statuses.first.reblog.text).to eq 'Overwatch rocks'
end
end

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