mastodon/spec/controllers/concerns/signature_verification_spec.rb
Eugen Rochko 21ad21cb50
Improve signature verification safeguards (#8959)
* Downcase signed_headers string before building the signed string

The HTTP Signatures draft does not mandate the “headers” field to be downcased,
but mandates the header field names to be downcased in the signed string, which
means that prior to this patch, Mastodon could fail to process signatures from
some compliant clients. It also means that it would not actually check the
Digest of non-compliant clients that wouldn't use a lowercased Digest field
name.

Thankfully, I don't know of any such client.

* Revert "Remove dead code (#8919)"

This reverts commit a00ce8c92c.

* Restore time window checking, change it to 12 hours

By checking the Date header, we can prevent replaying old vulnerable
signatures. The focus is to prevent replaying old vulnerable requests
from software that has been fixed in the meantime, so a somewhat long
window should be fine and accounts for timezone misconfiguration.

* Escape users' URLs when formatting them

Fixes possible HTML injection

* Escape all string interpolations in Formatter class

Slightly improve performance by reducing class allocations
from repeated Formatter#encode calls

* Fix code style issues
2018-10-12 00:15:55 +02:00

139 lines
3.3 KiB
Ruby

# frozen_string_literal: true
require 'rails_helper'
describe ApplicationController, type: :controller do
controller do
include SignatureVerification
def success
head 200
end
def alternative_success
head 200
end
end
before do
routes.draw { match via: [:get, :post], 'success' => 'anonymous#success' }
end
context 'without signature header' do
before do
get :success
end
describe '#signed_request?' do
it 'returns false' do
expect(controller.signed_request?).to be false
end
end
describe '#signed_request_account' do
it 'returns nil' do
expect(controller.signed_request_account).to be_nil
end
end
end
context 'with signature header' do
let!(:author) { Fabricate(:account) }
context 'without body' do
before do
get :success
fake_request = Request.new(:get, request.url)
fake_request.on_behalf_of(author)
request.headers.merge!(fake_request.headers)
end
describe '#signed_request?' do
it 'returns true' do
expect(controller.signed_request?).to be true
end
end
describe '#signed_request_account' do
it 'returns an account' do
expect(controller.signed_request_account).to eq author
end
it 'returns nil when path does not match' do
request.path = '/alternative-path'
expect(controller.signed_request_account).to be_nil
end
it 'returns nil when method does not match' do
post :success
expect(controller.signed_request_account).to be_nil
end
end
end
context 'with request older than a day' do
before do
get :success
fake_request = Request.new(:get, request.url)
fake_request.add_headers({ 'Date' => 2.days.ago.utc.httpdate })
fake_request.on_behalf_of(author)
request.headers.merge!(fake_request.headers)
end
describe '#signed_request?' do
it 'returns true' do
expect(controller.signed_request?).to be true
end
end
describe '#signed_request_account' do
it 'returns nil' do
expect(controller.signed_request_account).to be_nil
end
end
end
context 'with body' do
before do
post :success, body: 'Hello world'
fake_request = Request.new(:post, request.url, body: 'Hello world')
fake_request.on_behalf_of(author)
request.headers.merge!(fake_request.headers)
end
describe '#signed_request?' do
it 'returns true' do
expect(controller.signed_request?).to be true
end
end
describe '#signed_request_account' do
it 'returns an account' do
expect(controller.signed_request_account).to eq author
end
it 'returns nil when path does not match' do
request.path = '/alternative-path'
expect(controller.signed_request_account).to be_nil
end
it 'returns nil when method does not match' do
get :success
expect(controller.signed_request_account).to be_nil
end
it 'returns nil when body has been tampered' do
post :success, body: 'doo doo doo'
expect(controller.signed_request_account).to be_nil
end
end
end
end
end