Add CLI task for rotating keys (#8466)

* If an Update is signed with known key, skip re-following procedure

Because it means the remote actor did *not* lose their database

* Add CLI method for rotating keys

    bin/tootctl accounts rotate [USERNAME]

Generates a new RSA key per account and sends out an Update activity
signed with the old key.

* Key rotation: Space out Update fan-outs every 5 minutes per 1000 accounts

* Skip suspended accounts in key rotation
This commit is contained in:
Eugen Rochko 2018-08-26 20:21:03 +02:00 committed by GitHub
parent 8adf485c0f
commit cabdbb7f9c
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
10 changed files with 79 additions and 16 deletions

View file

@ -11,6 +11,6 @@ class ActivityPub::Activity::Update < ActivityPub::Activity
def update_account
return if @account.uri != object_uri
ActivityPub::ProcessAccountService.new.call(@account.username, @account.domain, @object)
ActivityPub::ProcessAccountService.new.call(@account.username, @account.domain, @object, signed_with_known_key: true)
end
end

View file

@ -32,7 +32,7 @@ class ActivityPub::LinkedDataSignature
end
end
def sign!(creator)
def sign!(creator, sign_with: nil)
options = {
'type' => 'RsaSignature2017',
'creator' => [ActivityPub::TagManager.instance.uri_for(creator), '#main-key'].join,
@ -42,8 +42,9 @@ class ActivityPub::LinkedDataSignature
options_hash = hash(options.without('type', 'id', 'signatureValue').merge('@context' => CONTEXT))
document_hash = hash(@json.without('signature'))
to_be_signed = options_hash + document_hash
keypair = sign_with.present? ? OpenSSL::PKey::RSA.new(sign_with) : creator.keypair
signature = Base64.strict_encode64(creator.keypair.sign(OpenSSL::Digest::SHA256.new, to_be_signed))
signature = Base64.strict_encode64(keypair.sign(OpenSSL::Digest::SHA256.new, to_be_signed))
@json.merge('signature' => options.merge('signatureValue' => signature))
end

View file

@ -22,10 +22,11 @@ class Request
set_digest! if options.key?(:body)
end
def on_behalf_of(account, key_id_format = :acct)
def on_behalf_of(account, key_id_format = :acct, sign_with: nil)
raise ArgumentError unless account.local?
@account = account
@keypair = sign_with.present? ? OpenSSL::PKey::RSA.new(sign_with) : @account.keypair
@key_id_format = key_id_format
self
@ -70,7 +71,7 @@ class Request
def signature
algorithm = 'rsa-sha256'
signature = Base64.strict_encode64(@account.keypair.sign(OpenSSL::Digest::SHA256.new, signed_string))
signature = Base64.strict_encode64(@keypair.sign(OpenSSL::Digest::SHA256.new, signed_string))
"keyId=\"#{key_id}\",algorithm=\"#{algorithm}\",headers=\"#{signed_headers}\",signature=\"#{signature}\""
end

View file

@ -5,9 +5,10 @@ class ActivityPub::ProcessAccountService < BaseService
# Should be called with confirmed valid JSON
# and WebFinger-resolved username and domain
def call(username, domain, json)
def call(username, domain, json, options = {})
return if json['inbox'].blank? || unsupported_uri_scheme?(json['id'])
@options = options
@json = json
@uri = @json['id']
@username = username
@ -31,7 +32,7 @@ class ActivityPub::ProcessAccountService < BaseService
return if @account.nil?
after_protocol_change! if protocol_changed?
after_key_change! if key_changed?
after_key_change! if key_changed? && !@options[:signed_with_known_key]
check_featured_collection! if @account.featured_collection_url.present?
@account

View file

@ -10,7 +10,8 @@ class ActivityPub::DeliveryWorker
HEADERS = { 'Content-Type' => 'application/activity+json' }.freeze
def perform(json, source_account_id, inbox_url)
def perform(json, source_account_id, inbox_url, options = {})
@options = options.with_indifferent_access
@json = json
@source_account = Account.find(source_account_id)
@inbox_url = inbox_url
@ -27,7 +28,7 @@ class ActivityPub::DeliveryWorker
def build_request
request = Request.new(:post, @inbox_url, body: @json)
request.on_behalf_of(@source_account, :uri)
request.on_behalf_of(@source_account, :uri, sign_with: @options[:sign_with])
request.add_headers(HEADERS)
end

View file

@ -5,7 +5,8 @@ class ActivityPub::UpdateDistributionWorker
sidekiq_options queue: 'push'
def perform(account_id)
def perform(account_id, options = {})
@options = options.with_indifferent_access
@account = Account.find(account_id)
ActivityPub::DeliveryWorker.push_bulk(inboxes) do |inbox_url|
@ -26,7 +27,7 @@ class ActivityPub::UpdateDistributionWorker
end
def signed_payload
@signed_payload ||= Oj.dump(ActivityPub::LinkedDataSignature.new(payload).sign!(@account))
@signed_payload ||= Oj.dump(ActivityPub::LinkedDataSignature.new(payload).sign!(@account, sign_with: @options[:sign_with]))
end
def payload

View file

@ -3,13 +3,16 @@
require 'thor'
require_relative 'mastodon/media_cli'
require_relative 'mastodon/emoji_cli'
require_relative 'mastodon/accounts_cli'
module Mastodon
class CLI < Thor
desc 'media SUBCOMMAND ...ARGS', 'manage media files'
desc 'media SUBCOMMAND ...ARGS', 'Manage media files'
subcommand 'media', Mastodon::MediaCLI
desc 'emoji SUBCOMMAND ...ARGS', 'manage custom emoji'
desc 'emoji SUBCOMMAND ...ARGS', 'Manage custom emoji'
subcommand 'emoji', Mastodon::EmojiCLI
desc 'accounts SUBCOMMAND ...ARGS', 'Manage accounts'
subcommand 'accounts', Mastodon::AccountsCLI
end
end

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@ -0,0 +1,55 @@
# frozen_string_literal: true
require 'rubygems/package'
require_relative '../../config/boot'
require_relative '../../config/environment'
require_relative 'cli_helper'
module Mastodon
class AccountsCLI < Thor
option :all, type: :boolean
desc 'rotate [USERNAME]', 'Generate and broadcast new keys'
long_desc <<-LONG_DESC
Generate and broadcast new RSA keys as part of security
maintenance.
With the --all option, all local accounts will be subject
to the rotation. Otherwise, and by default, only a single
account specified by the USERNAME argument will be
processed.
LONG_DESC
def rotate(username = nil)
if options[:all]
processed = 0
delay = 0
Account.local.without_suspended.find_in_batches do |accounts|
accounts.each do |account|
rotate_keys_for_account(account, delay)
processed += 1
say('.', :green, false)
end
delay += 5.minutes
end
say
say("OK, rotated keys for #{processed} accounts", :green)
elsif username.present?
rotate_keys_for_account(Account.find_local(username))
say('OK', :green)
else
say('No account(s) given', :red)
end
end
private
def rotate_keys_for_account(account, delay = 0)
old_key = account.private_key
new_key = OpenSSL::PKey::RSA.new(2048).to_pem
account.update(private_key: new_key)
ActivityPub::UpdateDistributionWorker.perform_in(delay, account.id, sign_with: old_key)
end
end
end

View file

@ -13,7 +13,7 @@ module Mastodon
option :suffix
option :overwrite, type: :boolean
option :unlisted, type: :boolean
desc 'import PATH', 'import emoji from a TAR archive at PATH'
desc 'import PATH', 'Import emoji from a TAR archive at PATH'
long_desc <<-LONG_DESC
Imports custom emoji from a TAR archive specified by PATH.

View file

@ -10,7 +10,7 @@ module Mastodon
class MediaCLI < Thor
option :days, type: :numeric, default: 7
option :background, type: :boolean, default: false
desc 'remove', 'remove remote media files'
desc 'remove', 'Remove remote media files'
long_desc <<-DESC
Removes locally cached copies of media attachments from other servers.