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Add handling of Linked Data Signatures in payloads (#4687) 

* Add handling of Linked Data Signatures in payloads

* Add a way to sign JSON, fix canonicalization of signature options

* Fix signatureValue encoding, send out signed JSON when distributing

* Add missing security context
shrike
Eugen Rochko 2017-08-26 13:47:38 +02:00 committed by GitHub
parent 1cebfed23e
commit 00840f4f2e
25 changed files with 369 additions and 30 deletions
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1
.rubocop.yml
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@ -10,6 +10,7 @@ AllCops:
- 'node_modules/**/*'
- 'Vagrantfile'
- 'vendor/**/*'
- 'lib/json_ld/*'
Bundler/OrderedGems:
Enabled: false

3
Gemfile
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@ -68,6 +68,9 @@ gem 'tzinfo-data', '~> 1.2017'
gem 'webpacker', '~> 2.0'
gem 'webpush'
gem 'json-ld-preloaded', '~> 2.2.1'
gem 'rdf-normalize', '~> 0.3.1'
group :development, :test do
gem 'fabrication', '~> 2.16'
gem 'fuubar', '~> 2.2'

16
Gemfile.lock
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@ -179,6 +179,8 @@ GEM
activesupport (>= 4.0.1)
hamlit (>= 1.2.0)
railties (>= 4.0.1)
hamster (3.0.0)
concurrent-ruby (~> 1.0)
hashdiff (0.3.5)
highline (1.7.8)
hiredis (0.6.1)
@ -211,6 +213,13 @@ GEM
idn-ruby (0.1.0)
jmespath (1.3.1)
json (2.1.0)
json-ld (2.1.5)
multi_json (~> 1.12)
rdf (~> 2.2)
json-ld-preloaded (2.2.1)
json-ld (~> 2.1, >= 2.1.5)
multi_json (~> 1.11)
rdf (~> 2.2)
jsonapi-renderer (0.1.3)
jwt (1.5.6)
kaminari (1.0.1)
@ -348,6 +357,11 @@ GEM
rainbow (2.2.2)
rake
rake (12.0.0)
rdf (2.2.8)
hamster (~> 3.0)
link_header (~> 0.0, >= 0.0.8)
rdf-normalize (0.3.2)
rdf (~> 2.0)
redis (3.3.3)
redis-actionpack (5.0.1)
actionpack (>= 4.0, < 6)
@ -531,6 +545,7 @@ DEPENDENCIES
httplog (~> 0.99)
i18n-tasks (~> 0.9)
idn-ruby
json-ld-preloaded (~> 2.2.1)
kaminari (~> 1.0)
letter_opener (~> 1.4)
letter_opener_web (~> 1.3)
@ -560,6 +575,7 @@ DEPENDENCIES
rails-controller-testing (~> 1.0)
rails-i18n (~> 5.0)
rails-settings-cached (~> 0.6)
rdf-normalize (~> 0.3.1)
redis (~> 3.3)
redis-namespace (~> 1.5)
redis-rails (~> 5.0)

13
app/helpers/jsonld_helper.rb
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@ -17,6 +17,11 @@ module JsonLdHelper
!json.nil? && equals_or_includes?(json['@context'], ActivityPub::TagManager::CONTEXT)
end
def canonicalize(json)
graph = RDF::Graph.new << JSON::LD::API.toRdf(json)
graph.dump(:normalize)
end
def fetch_resource(uri)
response = build_request(uri).perform
return if response.code != 200
@ -29,6 +34,14 @@ module JsonLdHelper
nil
end
def merge_context(context, new_context)
if context.is_a?(Array)
context << new_context
else
[context, new_context]
end
end
private
def build_request(uri)

2
app/lib/activitypub/adapter.rb
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@ -11,7 +11,7 @@ class ActivityPub::Adapter < ActiveModelSerializers::Adapter::Base
def serializable_hash(options = nil)
options = serialization_options(options)
serialized_hash = { '@context': ActivityPub::TagManager::CONTEXT }.merge(ActiveModelSerializers::Adapter::Attributes.new(serializer, instance_options).serializable_hash(options))
serialized_hash = { '@context': [ActivityPub::TagManager::CONTEXT, 'https://w3id.org/security/v1'] }.merge(ActiveModelSerializers::Adapter::Attributes.new(serializer, instance_options).serializable_hash(options))
self.class.transform_key_casing!(serialized_hash, instance_options)
end
end

56
app/lib/activitypub/linked_data_signature.rb Normal file
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@ -0,0 +1,56 @@
# frozen_string_literal: true
class ActivityPub::LinkedDataSignature
include JsonLdHelper
CONTEXT = 'https://w3id.org/identity/v1'
def initialize(json)
@json = json
end
def verify_account!
return unless @json['signature'].is_a?(Hash)
type = @json['signature']['type']
creator_uri = @json['signature']['creator']
signature = @json['signature']['signatureValue']
return unless type == 'RsaSignature2017'
creator = ActivityPub::TagManager.instance.uri_to_resource(creator_uri, Account)
creator ||= ActivityPub::FetchRemoteKeyService.new.call(creator_uri)
return if creator.nil?
options_hash = hash(@json['signature'].without('type', 'id', 'signatureValue').merge('@context' => CONTEXT))
document_hash = hash(@json.without('signature'))
to_be_verified = options_hash + document_hash
if creator.keypair.public_key.verify(OpenSSL::Digest::SHA256.new, Base64.decode64(signature), to_be_verified)
creator
end
end
def sign!(creator)
options = {
'type' => 'RsaSignature2017',
'creator' => [ActivityPub::TagManager.instance.uri_for(creator), '#main-key'].join,
'created' => Time.now.utc.iso8601,
}
options_hash = hash(options.without('type', 'id', 'signatureValue').merge('@context' => CONTEXT))
document_hash = hash(@json.without('signature'))
to_be_signed = options_hash + document_hash
signature = Base64.strict_encode64(creator.keypair.sign(OpenSSL::Digest::SHA256.new, to_be_signed))
@json.merge('@context' => merge_context(@json['@context'], CONTEXT), 'signature' => options.merge('signatureValue' => signature))
end
private
def hash(obj)
Digest::SHA256.hexdigest(canonicalize(obj))
end
end

11
app/services/activitypub/process_collection_service.rb
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@ -9,6 +9,8 @@ class ActivityPub::ProcessCollectionService < BaseService
return if @account.suspended? || !supported_context?
verify_account! if different_actor?
case @json['type']
when 'Collection', 'CollectionPage'
process_items @json['items']
@ -23,6 +25,10 @@ class ActivityPub::ProcessCollectionService < BaseService
private
def different_actor?
@json['actor'].present? && value_or_id(@json['actor']) != @account.uri && @json['signature'].present?
end
def process_items(items)
items.reverse_each.map { |item| process_item(item) }.compact
end
@ -35,4 +41,9 @@ class ActivityPub::ProcessCollectionService < BaseService
activity = ActivityPub::Activity.factory(item, @account)
activity&.perform
end
def verify_account!
account = ActivityPub::LinkedDataSignature.new(@json).verify_account!
@account = account unless account.nil?
end
end

4
app/services/authorize_follow_service.rb
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@ -24,11 +24,11 @@ class AuthorizeFollowService < BaseService
end
def build_json(follow_request)
ActiveModelSerializers::SerializableResource.new(
Oj.dump(ActivityPub::LinkedDataSignature.new(ActiveModelSerializers::SerializableResource.new(
follow_request,
serializer: ActivityPub::AcceptFollowSerializer,
adapter: ActivityPub::Adapter
).to_json
).as_json).sign!(follow_request.target_account))
end
def build_xml(follow_request)

8
app/services/batched_remove_status_service.rb
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@ -138,10 +138,14 @@ class BatchedRemoveStatusService < BaseService
def build_json(status)
return @activity_json[status.id] if @activity_json.key?(status.id)
@activity_json[status.id] = ActiveModelSerializers::SerializableResource.new(
@activity_json[status.id] = sign_json(status, ActiveModelSerializers::SerializableResource.new(
status,
serializer: ActivityPub::DeleteSerializer,
adapter: ActivityPub::Adapter
).to_json
).as_json)
end
def sign_json(status, json)
Oj.dump(ActivityPub::LinkedDataSignature.new(json).sign!(status.account))
end
end

4
app/services/block_service.rb
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@ -27,11 +27,11 @@ class BlockService < BaseService
end
def build_json(block)
ActiveModelSerializers::SerializableResource.new(
Oj.dump(ActivityPub::LinkedDataSignature.new(ActiveModelSerializers::SerializableResource.new(
block,
serializer: ActivityPub::BlockSerializer,
adapter: ActivityPub::Adapter
).to_json
).as_json).sign!(block.account))
end
def build_xml(block)

4
app/services/favourite_service.rb
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@ -34,11 +34,11 @@ class FavouriteService < BaseService
end
def build_json(favourite)
ActiveModelSerializers::SerializableResource.new(
Oj.dump(ActivityPub::LinkedDataSignature.new(ActiveModelSerializers::SerializableResource.new(
favourite,
serializer: ActivityPub::LikeSerializer,
adapter: ActivityPub::Adapter
).to_json
).as_json).sign!(favourite.account))
end
def build_xml(favourite)

4
app/services/follow_service.rb
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@ -67,10 +67,10 @@ class FollowService < BaseService
end
def build_json(follow_request)
ActiveModelSerializers::SerializableResource.new(
Oj.dump(ActivityPub::LinkedDataSignature.new(ActiveModelSerializers::SerializableResource.new(
follow_request,
serializer: ActivityPub::FollowSerializer,
adapter: ActivityPub::Adapter
).to_json
).as_json).sign!(follow_request.account))
end
end

4
app/services/process_mentions_service.rb
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@ -47,11 +47,11 @@ class ProcessMentionsService < BaseService
end
def build_json(status)
ActiveModelSerializers::SerializableResource.new(
Oj.dump(ActivityPub::LinkedDataSignature.new(ActiveModelSerializers::SerializableResource.new(
status,
serializer: ActivityPub::ActivitySerializer,
adapter: ActivityPub::Adapter
).to_json
).as_json).sign!(status.account))
end
def follow_remote_account_service

4
app/services/reblog_service.rb
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@ -42,10 +42,10 @@ class ReblogService < BaseService
end
def build_json(reblog)
ActiveModelSerializers::SerializableResource.new(
Oj.dump(ActivityPub::LinkedDataSignature.new(ActiveModelSerializers::SerializableResource.new(
reblog,
serializer: ActivityPub::ActivitySerializer,
adapter: ActivityPub::Adapter
).to_json
).as_json).sign!(reblog.account))
end
end

4
app/services/reject_follow_service.rb
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@ -19,11 +19,11 @@ class RejectFollowService < BaseService
end
def build_json(follow_request)
ActiveModelSerializers::SerializableResource.new(
Oj.dump(ActivityPub::LinkedDataSignature.new(ActiveModelSerializers::SerializableResource.new(
follow_request,
serializer: ActivityPub::RejectFollowSerializer,
adapter: ActivityPub::Adapter
).to_json
).as_json).sign!(follow_request.target_account))
end
def build_xml(follow_request)

10
app/services/remove_status_service.rb
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@ -56,7 +56,7 @@ class RemoveStatusService < BaseService
# ActivityPub
ActivityPub::DeliveryWorker.push_bulk(target_accounts.select(&:activitypub?).uniq(&:inbox_url)) do |inbox_url|
[activity_json, @account.id, inbox_url]
[signed_activity_json, @account.id, inbox_url]
end
end
@ -66,7 +66,7 @@ class RemoveStatusService < BaseService
# ActivityPub
ActivityPub::DeliveryWorker.push_bulk(@account.followers.inboxes) do |inbox_url|
[activity_json, @account.id, inbox_url]
[signed_activity_json, @account.id, inbox_url]
end
end
@ -74,12 +74,16 @@ class RemoveStatusService < BaseService
@salmon_xml ||= stream_entry_to_xml(@stream_entry)
end
def signed_activity_json
@signed_activity_json ||= Oj.dump(ActivityPub::LinkedDataSignature.new(activity_json).sign!(@account))
end
def activity_json
@activity_json ||= ActiveModelSerializers::SerializableResource.new(
@status,
serializer: ActivityPub::DeleteSerializer,
adapter: ActivityPub::Adapter
).to_json
).as_json
end
def remove_reblogs

4
app/services/unblock_service.rb
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@ -20,11 +20,11 @@ class UnblockService < BaseService
end
def build_json(unblock)
ActiveModelSerializers::SerializableResource.new(
Oj.dump(ActivityPub::LinkedDataSignature.new(ActiveModelSerializers::SerializableResource.new(
unblock,
serializer: ActivityPub::UndoBlockSerializer,
adapter: ActivityPub::Adapter
).to_json
).as_json).sign!(unblock.account))
end
def build_xml(block)

4
app/services/unfavourite_service.rb
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@ -21,11 +21,11 @@ class UnfavouriteService < BaseService
end
def build_json(favourite)
ActiveModelSerializers::SerializableResource.new(
Oj.dump(ActivityPub::LinkedDataSignature.new(ActiveModelSerializers::SerializableResource.new(
favourite,
serializer: ActivityPub::UndoLikeSerializer,
adapter: ActivityPub::Adapter
).to_json
).as_json).sign!(favourite.account))
end
def build_xml(favourite)

4
app/services/unfollow_service.rb
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@ -23,11 +23,11 @@ class UnfollowService < BaseService
end
def build_json(follow)
ActiveModelSerializers::SerializableResource.new(
Oj.dump(ActivityPub::LinkedDataSignature.new(ActiveModelSerializers::SerializableResource.new(
follow,
serializer: ActivityPub::UndoFollowSerializer,
adapter: ActivityPub::Adapter
).to_json
).as_json).sign!(follow.account))
end
def build_xml(follow)

8
app/workers/activitypub/distribution_worker.rb
View File

@ -12,7 +12,7 @@ class ActivityPub::DistributionWorker
return if skip_distribution?
ActivityPub::DeliveryWorker.push_bulk(inboxes) do |inbox_url|
[payload, @account.id, inbox_url]
[signed_payload, @account.id, inbox_url]
end
rescue ActiveRecord::RecordNotFound
true
@ -28,11 +28,15 @@ class ActivityPub::DistributionWorker
@inboxes ||= @account.followers.inboxes
end
def signed_payload
@signed_payload ||= Oj.dump(ActivityPub::LinkedDataSignature.new(payload).sign!(@account))
end
def payload
@payload ||= ActiveModelSerializers::SerializableResource.new(
@status,
serializer: ActivityPub::ActivitySerializer,
adapter: ActivityPub::Adapter
).to_json
).as_json
end
end

4
config/initializers/json_ld.rb Normal file
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@ -0,0 +1,4 @@
# frozen_string_literal: true
require_relative '../../lib/json_ld/identity'
require_relative '../../lib/json_ld/security'

86
lib/json_ld/identity.rb Normal file
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@ -0,0 +1,86 @@
# -*- encoding: utf-8 -*-
# frozen_string_literal: true
# This file generated automatically from https://w3id.org/identity/v1
require 'json/ld'
class JSON::LD::Context
add_preloaded("https://w3id.org/identity/v1") do
new(processingMode: "json-ld-1.0", term_definitions: {
"Credential" => TermDefinition.new("Credential", id: "https://w3id.org/credentials#Credential", simple: true),
"CryptographicKey" => TermDefinition.new("CryptographicKey", id: "https://w3id.org/security#Key", simple: true),
"CryptographicKeyCredential" => TermDefinition.new("CryptographicKeyCredential", id: "https://w3id.org/credentials#CryptographicKeyCredential", simple: true),
"EncryptedMessage" => TermDefinition.new("EncryptedMessage", id: "https://w3id.org/security#EncryptedMessage", simple: true),
"GraphSignature2012" => TermDefinition.new("GraphSignature2012", id: "https://w3id.org/security#GraphSignature2012", simple: true),
"Group" => TermDefinition.new("Group", id: "https://www.w3.org/ns/activitystreams#Group", simple: true),
"Identity" => TermDefinition.new("Identity", id: "https://w3id.org/identity#Identity", simple: true),
"LinkedDataSignature2015" => TermDefinition.new("LinkedDataSignature2015", id: "https://w3id.org/security#LinkedDataSignature2015", simple: true),
"Organization" => TermDefinition.new("Organization", id: "http://schema.org/Organization", simple: true),
"Person" => TermDefinition.new("Person", id: "http://schema.org/Person", simple: true),
"PostalAddress" => TermDefinition.new("PostalAddress", id: "http://schema.org/PostalAddress", simple: true),
"about" => TermDefinition.new("about", id: "http://schema.org/about", type_mapping: "@id"),
"accessControl" => TermDefinition.new("accessControl", id: "https://w3id.org/permissions#accessControl", type_mapping: "@id"),
"address" => TermDefinition.new("address", id: "http://schema.org/address", type_mapping: "@id"),
"addressCountry" => TermDefinition.new("addressCountry", id: "http://schema.org/addressCountry", simple: true),
"addressLocality" => TermDefinition.new("addressLocality", id: "http://schema.org/addressLocality", simple: true),
"addressRegion" => TermDefinition.new("addressRegion", id: "http://schema.org/addressRegion", simple: true),
"cipherAlgorithm" => TermDefinition.new("cipherAlgorithm", id: "https://w3id.org/security#cipherAlgorithm", simple: true),
"cipherData" => TermDefinition.new("cipherData", id: "https://w3id.org/security#cipherData", simple: true),
"cipherKey" => TermDefinition.new("cipherKey", id: "https://w3id.org/security#cipherKey", simple: true),
"claim" => TermDefinition.new("claim", id: "https://w3id.org/credentials#claim", type_mapping: "@id"),
"comment" => TermDefinition.new("comment", id: "http://www.w3.org/2000/01/rdf-schema#comment", simple: true),
"created" => TermDefinition.new("created", id: "http://purl.org/dc/terms/created", type_mapping: "http://www.w3.org/2001/XMLSchema#dateTime"),
"creator" => TermDefinition.new("creator", id: "http://purl.org/dc/terms/creator", type_mapping: "@id"),
"cred" => TermDefinition.new("cred", id: "https://w3id.org/credentials#", simple: true, prefix: true),
"credential" => TermDefinition.new("credential", id: "https://w3id.org/credentials#credential", type_mapping: "@id"),
"dc" => TermDefinition.new("dc", id: "http://purl.org/dc/terms/", simple: true, prefix: true),
"description" => TermDefinition.new("description", id: "http://schema.org/description", simple: true),
"digestAlgorithm" => TermDefinition.new("digestAlgorithm", id: "https://w3id.org/security#digestAlgorithm", simple: true),
"digestValue" => TermDefinition.new("digestValue", id: "https://w3id.org/security#digestValue", simple: true),
"domain" => TermDefinition.new("domain", id: "https://w3id.org/security#domain", simple: true),
"email" => TermDefinition.new("email", id: "http://schema.org/email", simple: true),
"expires" => TermDefinition.new("expires", id: "https://w3id.org/security#expiration", type_mapping: "http://www.w3.org/2001/XMLSchema#dateTime"),
"familyName" => TermDefinition.new("familyName", id: "http://schema.org/familyName", simple: true),
"givenName" => TermDefinition.new("givenName", id: "http://schema.org/givenName", simple: true),
"id" => TermDefinition.new("id", id: "@id", simple: true),
"identity" => TermDefinition.new("identity", id: "https://w3id.org/identity#", simple: true, prefix: true),
"identityService" => TermDefinition.new("identityService", id: "https://w3id.org/identity#identityService", type_mapping: "@id"),
"idp" => TermDefinition.new("idp", id: "https://w3id.org/identity#idp", type_mapping: "@id"),
"image" => TermDefinition.new("image", id: "http://schema.org/image", type_mapping: "@id"),
"initializationVector" => TermDefinition.new("initializationVector", id: "https://w3id.org/security#initializationVector", simple: true),
"issued" => TermDefinition.new("issued", id: "https://w3id.org/credentials#issued", type_mapping: "http://www.w3.org/2001/XMLSchema#dateTime"),
"issuer" => TermDefinition.new("issuer", id: "https://w3id.org/credentials#issuer", type_mapping: "@id"),
"label" => TermDefinition.new("label", id: "http://www.w3.org/2000/01/rdf-schema#label", simple: true),
"member" => TermDefinition.new("member", id: "http://schema.org/member", type_mapping: "@id"),
"memberOf" => TermDefinition.new("memberOf", id: "http://schema.org/memberOf", type_mapping: "@id"),
"name" => TermDefinition.new("name", id: "http://schema.org/name", simple: true),
"nonce" => TermDefinition.new("nonce", id: "https://w3id.org/security#nonce", simple: true),
"normalizationAlgorithm" => TermDefinition.new("normalizationAlgorithm", id: "https://w3id.org/security#normalizationAlgorithm", simple: true),
"owner" => TermDefinition.new("owner", id: "https://w3id.org/security#owner", type_mapping: "@id"),
"password" => TermDefinition.new("password", id: "https://w3id.org/security#password", simple: true),
"paymentProcessor" => TermDefinition.new("paymentProcessor", id: "https://w3id.org/payswarm#processor", simple: true),
"perm" => TermDefinition.new("perm", id: "https://w3id.org/permissions#", simple: true, prefix: true),
"postalCode" => TermDefinition.new("postalCode", id: "http://schema.org/postalCode", simple: true),
"preferences" => TermDefinition.new("preferences", id: "https://w3id.org/payswarm#preferences", type_mapping: "@vocab"),
"privateKey" => TermDefinition.new("privateKey", id: "https://w3id.org/security#privateKey", type_mapping: "@id"),
"privateKeyPem" => TermDefinition.new("privateKeyPem", id: "https://w3id.org/security#privateKeyPem", simple: true),
"ps" => TermDefinition.new("ps", id: "https://w3id.org/payswarm#", simple: true, prefix: true),
"publicKey" => TermDefinition.new("publicKey", id: "https://w3id.org/security#publicKey", type_mapping: "@id"),
"publicKeyPem" => TermDefinition.new("publicKeyPem", id: "https://w3id.org/security#publicKeyPem", simple: true),
"publicKeyService" => TermDefinition.new("publicKeyService", id: "https://w3id.org/security#publicKeyService", type_mapping: "@id"),
"rdf" => TermDefinition.new("rdf", id: "http://www.w3.org/1999/02/22-rdf-syntax-ns#", simple: true, prefix: true),
"rdfs" => TermDefinition.new("rdfs", id: "http://www.w3.org/2000/01/rdf-schema#", simple: true, prefix: true),
"recipient" => TermDefinition.new("recipient", id: "https://w3id.org/credentials#recipient", type_mapping: "@id"),
"revoked" => TermDefinition.new("revoked", id: "https://w3id.org/security#revoked", type_mapping: "http://www.w3.org/2001/XMLSchema#dateTime"),
"schema" => TermDefinition.new("schema", id: "http://schema.org/", simple: true, prefix: true),
"sec" => TermDefinition.new("sec", id: "https://w3id.org/security#", simple: true, prefix: true),
"signature" => TermDefinition.new("signature", id: "https://w3id.org/security#signature", simple: true),
"signatureAlgorithm" => TermDefinition.new("signatureAlgorithm", id: "https://w3id.org/security#signatureAlgorithm", simple: true),
"signatureValue" => TermDefinition.new("signatureValue", id: "https://w3id.org/security#signatureValue", simple: true),
"streetAddress" => TermDefinition.new("streetAddress", id: "http://schema.org/streetAddress", simple: true),
"title" => TermDefinition.new("title", id: "http://purl.org/dc/terms/title", simple: true),
"type" => TermDefinition.new("type", id: "@type", simple: true),
"url" => TermDefinition.new("url", id: "http://schema.org/url", type_mapping: "@id"),
"writePermission" => TermDefinition.new("writePermission", id: "https://w3id.org/permissions#writePermission", type_mapping: "@id"),
"xsd" => TermDefinition.new("xsd", id: "http://www.w3.org/2001/XMLSchema#", simple: true, prefix: true)
})
end
end

50
lib/json_ld/security.rb Normal file
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@ -0,0 +1,50 @@
# -*- encoding: utf-8 -*-
# frozen_string_literal: true
# This file generated automatically from https://w3id.org/security/v1
require 'json/ld'
class JSON::LD::Context
add_preloaded("https://w3id.org/security/v1") do
new(processingMode: "json-ld-1.0", term_definitions: {
"CryptographicKey" => TermDefinition.new("CryptographicKey", id: "https://w3id.org/security#Key", simple: true),
"EcdsaKoblitzSignature2016" => TermDefinition.new("EcdsaKoblitzSignature2016", id: "https://w3id.org/security#EcdsaKoblitzSignature2016", simple: true),
"EncryptedMessage" => TermDefinition.new("EncryptedMessage", id: "https://w3id.org/security#EncryptedMessage", simple: true),
"GraphSignature2012" => TermDefinition.new("GraphSignature2012", id: "https://w3id.org/security#GraphSignature2012", simple: true),
"LinkedDataSignature2015" => TermDefinition.new("LinkedDataSignature2015", id: "https://w3id.org/security#LinkedDataSignature2015", simple: true),
"LinkedDataSignature2016" => TermDefinition.new("LinkedDataSignature2016", id: "https://w3id.org/security#LinkedDataSignature2016", simple: true),
"authenticationTag" => TermDefinition.new("authenticationTag", id: "https://w3id.org/security#authenticationTag", simple: true),
"canonicalizationAlgorithm" => TermDefinition.new("canonicalizationAlgorithm", id: "https://w3id.org/security#canonicalizationAlgorithm", simple: true),
"cipherAlgorithm" => TermDefinition.new("cipherAlgorithm", id: "https://w3id.org/security#cipherAlgorithm", simple: true),
"cipherData" => TermDefinition.new("cipherData", id: "https://w3id.org/security#cipherData", simple: true),
"cipherKey" => TermDefinition.new("cipherKey", id: "https://w3id.org/security#cipherKey", simple: true),
"created" => TermDefinition.new("created", id: "http://purl.org/dc/terms/created", type_mapping: "http://www.w3.org/2001/XMLSchema#dateTime"),
"creator" => TermDefinition.new("creator", id: "http://purl.org/dc/terms/creator", type_mapping: "@id"),
"dc" => TermDefinition.new("dc", id: "http://purl.org/dc/terms/", simple: true, prefix: true),
"digestAlgorithm" => TermDefinition.new("digestAlgorithm", id: "https://w3id.org/security#digestAlgorithm", simple: true),
"digestValue" => TermDefinition.new("digestValue", id: "https://w3id.org/security#digestValue", simple: true),
"domain" => TermDefinition.new("domain", id: "https://w3id.org/security#domain", simple: true),
"encryptionKey" => TermDefinition.new("encryptionKey", id: "https://w3id.org/security#encryptionKey", simple: true),
"expiration" => TermDefinition.new("expiration", id: "https://w3id.org/security#expiration", type_mapping: "http://www.w3.org/2001/XMLSchema#dateTime"),
"expires" => TermDefinition.new("expires", id: "https://w3id.org/security#expiration", type_mapping: "http://www.w3.org/2001/XMLSchema#dateTime"),
"id" => TermDefinition.new("id", id: "@id", simple: true),
"initializationVector" => TermDefinition.new("initializationVector", id: "https://w3id.org/security#initializationVector", simple: true),
"iterationCount" => TermDefinition.new("iterationCount", id: "https://w3id.org/security#iterationCount", simple: true),
"nonce" => TermDefinition.new("nonce", id: "https://w3id.org/security#nonce", simple: true),
"normalizationAlgorithm" => TermDefinition.new("normalizationAlgorithm", id: "https://w3id.org/security#normalizationAlgorithm", simple: true),
"owner" => TermDefinition.new("owner", id: "https://w3id.org/security#owner", type_mapping: "@id"),
"password" => TermDefinition.new("password", id: "https://w3id.org/security#password", simple: true),
"privateKey" => TermDefinition.new("privateKey", id: "https://w3id.org/security#privateKey", type_mapping: "@id"),
"privateKeyPem" => TermDefinition.new("privateKeyPem", id: "https://w3id.org/security#privateKeyPem", simple: true),
"publicKey" => TermDefinition.new("publicKey", id: "https://w3id.org/security#publicKey", type_mapping: "@id"),
"publicKeyPem" => TermDefinition.new("publicKeyPem", id: "https://w3id.org/security#publicKeyPem", simple: true),
"publicKeyService" => TermDefinition.new("publicKeyService", id: "https://w3id.org/security#publicKeyService", type_mapping: "@id"),
"revoked" => TermDefinition.new("revoked", id: "https://w3id.org/security#revoked", type_mapping: "http://www.w3.org/2001/XMLSchema#dateTime"),
"salt" => TermDefinition.new("salt", id: "https://w3id.org/security#salt", simple: true),
"sec" => TermDefinition.new("sec", id: "https://w3id.org/security#", simple: true, prefix: true),
"signature" => TermDefinition.new("signature", id: "https://w3id.org/security#signature", simple: true),
"signatureAlgorithm" => TermDefinition.new("signatureAlgorithm", id: "https://w3id.org/security#signingAlgorithm", simple: true),
"signatureValue" => TermDefinition.new("signatureValue", id: "https://w3id.org/security#signatureValue", simple: true),
"type" => TermDefinition.new("type", id: "@type", simple: true),
"xsd" => TermDefinition.new("xsd", id: "http://www.w3.org/2001/XMLSchema#", simple: true, prefix: true)
})
end
end

86
spec/lib/activitypub/linked_data_signature_spec.rb Normal file
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@ -0,0 +1,86 @@
require 'rails_helper'
RSpec.describe ActivityPub::LinkedDataSignature do
include JsonLdHelper
let!(:sender) { Fabricate(:account, uri: 'http://example.com/alice') }
let(:raw_json) do
{
'@context' => 'https://www.w3.org/ns/activitystreams',
'id' => 'http://example.com/hello-world',
}
end
let(:json) { raw_json.merge('signature' => signature) }
subject { described_class.new(json) }
describe '#verify_account!' do
context 'when signature matches' do
let(:raw_signature) do
{
'creator' => 'http://example.com/alice',
'created' => '2017-09-23T20:21:34Z',
}
end
let(:signature) { raw_signature.merge('type' => 'RsaSignature2017', 'signatureValue' => sign(sender, raw_signature, raw_json)) }
it 'returns creator' do
expect(subject.verify_account!).to eq sender
end
end
context 'when signature is missing' do
let(:signature) { nil }
it 'returns nil' do
expect(subject.verify_account!).to be_nil
end
end
context 'when signature is tampered' do
let(:raw_signature) do
{
'creator' => 'http://example.com/alice',
'created' => '2017-09-23T20:21:34Z',
}
end
let(:signature) { raw_signature.merge('type' => 'RsaSignature2017', 'signatureValue' => 's69F3mfddd99dGjmvjdjjs81e12jn121Gkm1') }
it 'returns nil' do
expect(subject.verify_account!).to be_nil
end
end
end
describe '#sign!' do
subject { described_class.new(raw_json).sign!(sender) }
it 'returns a hash' do
expect(subject).to be_a Hash
end
it 'contains signature context' do
expect(subject['@context']).to include('https://www.w3.org/ns/activitystreams', 'https://w3id.org/identity/v1')
end
it 'contains signature' do
expect(subject['signature']).to be_a Hash
expect(subject['signature']['signatureValue']).to be_present
end
it 'can be verified again' do
expect(described_class.new(subject).verify_account!).to eq sender
end
end
def sign(from_account, options, document)
options_hash = Digest::SHA256.hexdigest(canonicalize(options.merge('@context' => ActivityPub::LinkedDataSignature::CONTEXT)))
document_hash = Digest::SHA256.hexdigest(canonicalize(document))
to_be_verified = options_hash + document_hash
Base64.strict_encode64(from_account.keypair.sign(OpenSSL::Digest::SHA256.new, to_be_verified))
end
end

5
spec/services/activitypub/process_collection_service_spec.rb
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@ -1,9 +1,10 @@
require 'rails_helper'
RSpec.describe ActivityPub::ProcessCollectionService do
subject { ActivityPub::ProcessCollectionService.new }
subject { described_class.new }
describe '#call' do
pending
context 'when actor is the sender'
context 'when actor differs from sender'
end
end