From 1998c561b2ffe7200781778f281fcc0890ebf6df Mon Sep 17 00:00:00 2001 From: Claire Date: Fri, 22 Dec 2023 19:56:22 +0100 Subject: [PATCH] Convert signature verification specs to request specs (#28443) --- .../concerns/signature_verification_spec.rb | 305 ---------------- spec/requests/signature_verification_spec.rb | 332 ++++++++++++++++++ 2 files changed, 332 insertions(+), 305 deletions(-) delete mode 100644 spec/controllers/concerns/signature_verification_spec.rb create mode 100644 spec/requests/signature_verification_spec.rb diff --git a/spec/controllers/concerns/signature_verification_spec.rb b/spec/controllers/concerns/signature_verification_spec.rb deleted file mode 100644 index 650cd21ea..000000000 --- a/spec/controllers/concerns/signature_verification_spec.rb +++ /dev/null @@ -1,305 +0,0 @@ -# frozen_string_literal: true - -require 'rails_helper' - -describe SignatureVerification do - let(:wrapped_actor_class) do - Class.new do - attr_reader :wrapped_account - - def initialize(wrapped_account) - @wrapped_account = wrapped_account - end - - delegate :uri, :keypair, to: :wrapped_account - end - end - - controller(ApplicationController) do - include SignatureVerification - - before_action :require_actor_signature!, only: [:signature_required] - - def success - head 200 - end - - def alternative_success - head 200 - end - - def signature_required - head 200 - end - end - - before do - routes.draw do - match :via => [:get, :post], 'success' => 'anonymous#success' - match :via => [:get, :post], 'signature_required' => 'anonymous#signature_required' - end - 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, domain: 'example.com', uri: 'https://example.com/actor') } - - 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 a valid actor that is not an Account' do - let(:actor) { wrapped_actor_class.new(author) } - - before do - get :success - - fake_request = Request.new(:get, request.url) - fake_request.on_behalf_of(author) - - request.headers.merge!(fake_request.headers) - - allow(ActivityPub::TagManager.instance).to receive(:uri_to_actor).with(anything) do - actor - end - 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 - - describe '#signed_request_actor' do - it 'returns the expected actor' do - expect(controller.signed_request_actor).to eq actor - end - end - end - - context 'with request with unparsable Date header' do - before do - get :success - - fake_request = Request.new(:get, request.url) - fake_request.add_headers({ 'Date' => 'wrong date' }) - 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 - - describe '#signature_verification_failure_reason' do - it 'contains an error description' do - controller.signed_request_account - expect(controller.signature_verification_failure_reason[:error]).to eq 'Invalid Date header: not RFC 2616 compliant date: "wrong date"' - 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 - - describe '#signature_verification_failure_reason' do - it 'contains an error description' do - controller.signed_request_account - expect(controller.signature_verification_failure_reason[:error]).to eq 'Signed request date outside acceptable time window' - end - end - end - - context 'with inaccessible key' do - before do - get :success - - author = Fabricate(:account, domain: 'localhost:5000', uri: 'http://localhost:5000/actor') - fake_request = Request.new(:get, request.url) - fake_request.on_behalf_of(author) - author.destroy - - request.headers.merge!(fake_request.headers) - - stub_request(:get, 'http://localhost:5000/actor#main-key').to_raise(Mastodon::HostValidationError) - 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 - allow(controller).to receive(:actor_refresh_key!).and_return(author) - 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 - end - - context 'when path does not match' do - before do - request.path = '/alternative-path' - end - - describe '#signed_request_account' do - it 'returns nil' do - expect(controller.signed_request_account).to be_nil - end - end - - describe '#signature_verification_failure_reason' do - it 'contains an error description' do - controller.signed_request_account - expect(controller.signature_verification_failure_reason[:error]).to include('using rsa-sha256 (RSASSA-PKCS1-v1_5 with SHA-256)') - expect(controller.signature_verification_failure_reason[:signed_string]).to include("(request-target): post /alternative-path\n") - end - end - end - - context 'when method does not match' do - before do - get :success - end - - describe '#signed_request_account' do - it 'returns nil' do - expect(controller.signed_request_account).to be_nil - end - end - end - - context 'when body has been tampered' do - before do - post :success, body: 'doo doo doo' - end - - describe '#signed_request_account' do - it 'returns nil when body has been tampered' do - expect(controller.signed_request_account).to be_nil - end - end - end - end - end - - context 'when a signature is required' do - before do - get :signature_required - end - - context 'without signature header' do - it 'returns HTTP 401' do - expect(response).to have_http_status(401) - end - - it 'returns an error' do - expect(Oj.load(response.body)['error']).to eq 'Request not signed' - end - end - end -end diff --git a/spec/requests/signature_verification_spec.rb b/spec/requests/signature_verification_spec.rb new file mode 100644 index 000000000..b753750b8 --- /dev/null +++ b/spec/requests/signature_verification_spec.rb @@ -0,0 +1,332 @@ +# frozen_string_literal: true + +require 'rails_helper' + +describe 'signature verification concern' do + before do + stub_tests_controller + + # Signature checking is time-dependent, so travel to a fixed date + travel_to '2023-12-20T10:00:00Z' + end + + after { Rails.application.reload_routes! } + + # Include the private key so the tests can be easily adjusted and reviewed + let(:actor_keypair) do + OpenSSL::PKey.read(<<~PEM_TEXT) + -----BEGIN RSA PRIVATE KEY----- + MIIEowIBAAKCAQEAqIAYvNFGbZ5g4iiK6feSdXD4bDStFM58A7tHycYXaYtzZQpI + eHXAmaXuZzXIwtrP4N0gIk8JNwZvXj2UPS+S07t0V9wNK94he01LV5EMz/GN4eNn + FmDL64HIEuKLvV8TvgjbUPRD6Y5X0UpKi2ZIFLSb96Q5w0Z/k7ntpVKV52y8kz5F + jr/O/0JuHryZe0yItzJh8kzFfeMf0EXzfSnaKvT7P9jhgC6uTre+jXyvVZjiHDrn + qvvucdI3I7DRfXo1OqARBrLjy+TdseUAjNYJ+OuPRI1URIWQI01DCHqcohVu9+Ar + +BiCjFp3ua+XMuJvrvbD61d1Fvig/9nbBRR+8QIDAQABAoIBAAgySHnFWI6gItR3 + fkfiqIm80cHCN3Xk1C6iiVu+3oBOZbHpW9R7vl9e/WOA/9O+LPjiSsQOegtWnVvd + RRjrl7Hj20VDlZKv5Mssm6zOGAxksrcVbqwdj+fUJaNJCL0AyyseH0x/IE9T8rDC + I1GH+3tB3JkhkIN/qjipdX5ab8MswEPu8IC4ViTpdBgWYY/xBcAHPw4xuL0tcwzh + FBlf4DqoEVQo8GdK5GAJ2Ny0S4xbXHUURzx/R4y4CCts7niAiLGqd9jmLU1kUTMk + QcXfQYK6l+unLc7wDYAz7sFEHh04M48VjWwiIZJnlCqmQbLda7uhhu8zkF1DqZTu + ulWDGQECgYEA0TIAc8BQBVab979DHEEmMdgqBwxLY3OIAk0b+r50h7VBGWCDPRsC + STD73fQY3lNet/7/jgSGwwAlAJ5PpMXxXiZAE3bUwPmHzgF7pvIOOLhA8O07tHSO + L2mvQe6NPzjZ+6iAO2U9PkClxcvGvPx2OBvisfHqZLmxC9PIVxzruQECgYEAzjM6 + BTUXa6T/qHvLFbN699BXsUOGmHBGaLRapFDBfVvgZrwqYQcZpBBhesLdGTGSqwE7 + gWsITPIJ+Ldo+38oGYyVys+w/V67q6ud7hgSDTW3hSvm+GboCjk6gzxlt9hQ0t9X + 8vfDOYhEXvVUJNv3mYO60ENqQhILO4bQ0zi+VfECgYBb/nUccfG+pzunU0Cb6Dp3 + qOuydcGhVmj1OhuXxLFSDG84Tazo7juvHA9mp7VX76mzmDuhpHPuxN2AzB2SBEoE + cSW0aYld413JRfWukLuYTc6hJHIhBTCRwRQFFnae2s1hUdQySm8INT2xIc+fxBXo + zrp+Ljg5Wz90SAnN5TX0AQKBgDaatDOq0o/r+tPYLHiLtfWoE4Dau+rkWJDjqdk3 + lXWn/e3WyHY3Vh/vQpEqxzgju45TXjmwaVtPATr+/usSykCxzP0PMPR3wMT+Rm1F + rIoY/odij+CaB7qlWwxj0x/zRbwB7x1lZSp4HnrzBpxYL+JUUwVRxPLIKndSBTza + GvVRAoGBAIVBcNcRQYF4fvZjDKAb4fdBsEuHmycqtRCsnkGOz6ebbEQznSaZ0tZE + +JuouZaGjyp8uPjNGD5D7mIGbyoZ3KyG4mTXNxDAGBso1hrNDKGBOrGaPhZx8LgO + 4VXJ+ybXrATf4jr8ccZYsZdFpOphPzz+j55Mqg5vac5P1XjmsGTb + -----END RSA PRIVATE KEY----- + PEM_TEXT + end + + context 'without a Signature header' do + it 'does not treat the request as signed' do + get '/activitypub/success' + + expect(response).to have_http_status(200) + expect(body_as_json).to match( + signed_request: false, + signature_actor_id: nil, + error: 'Request not signed' + ) + end + + context 'when a signature is required' do + it 'returns http unauthorized with appropriate error' do + get '/activitypub/signature_required' + + expect(response).to have_http_status(401) + expect(body_as_json).to match( + error: 'Request not signed' + ) + end + end + end + + context 'with an HTTP Signature from a known account' do + let!(:actor) { Fabricate(:account, domain: 'remote.domain', uri: 'https://remote.domain/users/bob', private_key: nil, public_key: actor_keypair.public_key.to_pem) } + + context 'with a valid signature on a GET request' do + let(:signature_header) do + 'keyId="https://remote.domain/users/bob#main-key",algorithm="rsa-sha256",headers="date host (request-target)",signature="Z8ilar3J7bOwqZkMp7sL8sRs4B1FT+UorbmvWoE+A5UeoOJ3KBcUmbsh+k3wQwbP5gMNUrra9rEWabpasZGphLsbDxfbsWL3Cf0PllAc7c1c7AFEwnewtExI83/qqgEkfWc2z7UDutXc2NfgAx89Ox8DXU/fA2GG0jILjB6UpFyNugkY9rg6oI31UnvfVi3R7sr3/x8Ea3I9thPvqI2byF6cojknSpDAwYzeKdngX3TAQEGzFHz3SDWwyp3jeMWfwvVVbM38FxhvAnSumw7YwWW4L7M7h4M68isLimoT3yfCn2ucBVL5Dz8koBpYf/40w7QidClAwCafZQFC29yDOg=="' # rubocop:disable Layout/LineLength + end + + it 'successfuly verifies signature', :aggregate_failures do + expect(signature_header).to eq build_signature_string(actor_keypair, 'https://remote.domain/users/bob#main-key', 'get /activitypub/success', { 'Date' => 'Wed, 20 Dec 2023 10:00:00 GMT', 'Host' => 'www.example.com' }) + + get '/activitypub/success', headers: { + 'Host' => 'www.example.com', + 'Date' => 'Wed, 20 Dec 2023 10:00:00 GMT', + 'Signature' => signature_header, + } + + expect(response).to have_http_status(200) + expect(body_as_json).to match( + signed_request: true, + signature_actor_id: actor.id.to_s + ) + end + end + + context 'with a mismatching path' do + it 'fails to verify signature', :aggregate_failures do + get '/activitypub/alternative-path', headers: { + 'Host' => 'www.example.com', + 'Date' => 'Wed, 20 Dec 2023 10:00:00 GMT', + 'Signature' => 'keyId="https://remote.domain/users/bob#main-key",algorithm="rsa-sha256",headers="date host (request-target)",signature="Z8ilar3J7bOwqZkMp7sL8sRs4B1FT+UorbmvWoE+A5UeoOJ3KBcUmbsh+k3wQwbP5gMNUrra9rEWabpasZGphLsbDxfbsWL3Cf0PllAc7c1c7AFEwnewtExI83/qqgEkfWc2z7UDutXc2NfgAx89Ox8DXU/fA2GG0jILjB6UpFyNugkY9rg6oI31UnvfVi3R7sr3/x8Ea3I9thPvqI2byF6cojknSpDAwYzeKdngX3TAQEGzFHz3SDWwyp3jeMWfwvVVbM38FxhvAnSumw7YwWW4L7M7h4M68isLimoT3yfCn2ucBVL5Dz8koBpYf/40w7QidClAwCafZQFC29yDOg=="', # rubocop:disable Layout/LineLength + } + + expect(body_as_json).to match( + signed_request: true, + signature_actor_id: nil, + error: anything + ) + end + end + + context 'with a mismatching method' do + it 'fails to verify signature', :aggregate_failures do + post '/activitypub/success', headers: { + 'Host' => 'www.example.com', + 'Date' => 'Wed, 20 Dec 2023 10:00:00 GMT', + 'Signature' => 'keyId="https://remote.domain/users/bob#main-key",algorithm="rsa-sha256",headers="date host (request-target)",signature="Z8ilar3J7bOwqZkMp7sL8sRs4B1FT+UorbmvWoE+A5UeoOJ3KBcUmbsh+k3wQwbP5gMNUrra9rEWabpasZGphLsbDxfbsWL3Cf0PllAc7c1c7AFEwnewtExI83/qqgEkfWc2z7UDutXc2NfgAx89Ox8DXU/fA2GG0jILjB6UpFyNugkY9rg6oI31UnvfVi3R7sr3/x8Ea3I9thPvqI2byF6cojknSpDAwYzeKdngX3TAQEGzFHz3SDWwyp3jeMWfwvVVbM38FxhvAnSumw7YwWW4L7M7h4M68isLimoT3yfCn2ucBVL5Dz8koBpYf/40w7QidClAwCafZQFC29yDOg=="', # rubocop:disable Layout/LineLength + } + + expect(body_as_json).to match( + signed_request: true, + signature_actor_id: nil, + error: anything + ) + end + end + + context 'with an unparsable date' do + let(:signature_header) do + 'keyId="https://remote.domain/users/bob#main-key",algorithm="rsa-sha256",headers="date host (request-target)",signature="d4B7nfx8RJcfdJDu1J//5WzPzK/hgtPkdzZx49lu5QhnE7qdV3lgyVimmhCFrO16bwvzIp9iRMyRLkNFxLiEeVaa1gqeKbldGSnU0B0OMjx7rFBa65vLuzWQOATDitVGiBEYqoK4v0DMuFCz2DtFaA/DIUZ3sty8bZ/Ea3U1nByLOO6MacARA3zhMSI0GNxGqsSmZmG0hPLavB3jIXoE3IDoQabMnC39jrlcO/a8h1iaxBm2WD8TejrImJullgqlJIFpKhIHI3ipQkvTGPlm9dx0y+beM06qBvWaWQcmT09eRIUefVsOAzIhUtS/7FVb/URhZvircIJDa7vtiFcmZQ=="' # rubocop:disable Layout/LineLength + end + + it 'fails to verify signature', :aggregate_failures do + expect(signature_header).to eq build_signature_string(actor_keypair, 'https://remote.domain/users/bob#main-key', 'get /activitypub/success', { 'Date' => 'wrong date', 'Host' => 'www.example.com' }) + + get '/activitypub/success', headers: { + 'Host' => 'www.example.com', + 'Date' => 'wrong date', + 'Signature' => signature_header, + } + + expect(body_as_json).to match( + signed_request: true, + signature_actor_id: nil, + error: 'Invalid Date header: not RFC 2616 compliant date: "wrong date"' + ) + end + end + + context 'with a request older than a day' do + let(:signature_header) do + 'keyId="https://remote.domain/users/bob#main-key",algorithm="rsa-sha256",headers="date host (request-target)",signature="G1NuJv4zgoZ3B/ZIjzDWZHK4RC+5pYee74q8/LJEMCWXhcnAomcb9YHaqk1QYfQvcBUIXw3UZ3Q9xO8F9y0i8G5mzJHfQ+OgHqCoJk8EmGwsUXJMh5s1S5YFCRt8TT12TmJZz0VMqLq85ubueSYBM7QtUE/FzFIVLvz4RysgXxaXQKzdnM6+gbUEEKdCURpXdQt2NXQhp4MAmZH3+0lQoR6VxdsK0hx0Ji2PNp1nuqFTlYqNWZazVdLBN+9rETLRmvGXknvg9jOxTTppBVWnkAIl26HtLS3wwFVvz4pJzi9OQDOvLziehVyLNbU61hky+oJ215e2HuKSe2hxHNl1MA=="' # rubocop:disable Layout/LineLength + end + + it 'fails to verify signature', :aggregate_failures do + expect(signature_header).to eq build_signature_string(actor_keypair, 'https://remote.domain/users/bob#main-key', 'get /activitypub/success', { 'Date' => 'Wed, 18 Dec 2023 10:00:00 GMT', 'Host' => 'www.example.com' }) + + get '/activitypub/success', headers: { + 'Host' => 'www.example.com', + 'Date' => 'Wed, 18 Dec 2023 10:00:00 GMT', + 'Signature' => signature_header, + } + + expect(body_as_json).to match( + signed_request: true, + signature_actor_id: nil, + error: 'Signed request date outside acceptable time window' + ) + end + end + + context 'with a valid signature on a POST request' do + let(:digest_header) { 'SHA-256=ZOyIygCyaOW6GjVnihtTFtIS9PNmskdyMlNKiuyjfzw=' } + let(:signature_header) do + 'keyId="https://remote.domain/users/bob#main-key",algorithm="rsa-sha256",headers="host date digest (request-target)",signature="gmhMjgMROGElJU3fpehV2acD5kMHeELi8EFP2UPHOdQ54H0r55AxIpji+J3lPe+N2qSb/4H1KXIh6f0lRu8TGSsu12OQmg5hiO8VA9flcA/mh9Lpk+qwlQZIPRqKP9xUEfqD+Z7ti5wPzDKrWAUK/7FIqWgcT/mlqB1R1MGkpMFc/q4CIs2OSNiWgA4K+Kp21oQxzC2kUuYob04gAZ7cyE/FTia5t08uv6lVYFdRsn4XNPn1MsHgFBwBMRG79ng3SyhoG4PrqBEi5q2IdLq3zfre/M6He3wlCpyO2VJNdGVoTIzeZ0Zz8jUscPV3XtWUchpGclLGSaKaq/JyNZeiYQ=="' # rubocop:disable Layout/LineLength + end + + it 'successfuly verifies signature', :aggregate_failures do + expect(digest_header).to eq digest_value('Hello world') + expect(signature_header).to eq build_signature_string(actor_keypair, 'https://remote.domain/users/bob#main-key', 'post /activitypub/success', { 'Host' => 'www.example.com', 'Date' => 'Wed, 20 Dec 2023 10:00:00 GMT', 'Digest' => digest_header }) + + post '/activitypub/success', params: 'Hello world', headers: { + 'Host' => 'www.example.com', + 'Date' => 'Wed, 20 Dec 2023 10:00:00 GMT', + 'Digest' => digest_header, + 'Signature' => signature_header, + } + + expect(response).to have_http_status(200) + expect(body_as_json).to match( + signed_request: true, + signature_actor_id: actor.id.to_s + ) + end + end + + context 'when the Digest of a POST request is not signed' do + let(:digest_header) { 'SHA-256=ZOyIygCyaOW6GjVnihtTFtIS9PNmskdyMlNKiuyjfzw=' } + let(:signature_header) do + 'keyId="https://remote.domain/users/bob#main-key",algorithm="rsa-sha256",headers="host date (request-target)",signature="CPD704CG8aCm8X8qIP8kkkiGp1qwFLk/wMVQHOGP0Txxan8c2DZtg/KK7eN8RG8tHx8br/yS2hJs51x4kXImYukGzNJd7ihE3T8lp+9RI1tCcdobTzr/VcVJHDFySdQkg266GCMijRQRZfNvqlJLiisr817PI+gNVBI5qV+vnVd1XhWCEZ+YSmMe8UqYARXAYNqMykTheojqGpTeTFGPUpTQA2Fmt2BipwIjcFDm2Hpihl2kB0MUS0x3zPmHDuadvzoBbN6m3usPDLgYrpALlh+wDs1dYMntcwdwawRKY1oE1XNtgOSum12wntDq3uYL4gya2iPdcw3c929b4koUzw=="' # rubocop:disable Layout/LineLength + end + + it 'fails to verify signature', :aggregate_failures do + expect(digest_header).to eq digest_value('Hello world') + expect(signature_header).to eq build_signature_string(actor_keypair, 'https://remote.domain/users/bob#main-key', 'post /activitypub/success', { 'Host' => 'www.example.com', 'Date' => 'Wed, 20 Dec 2023 10:00:00 GMT' }) + + post '/activitypub/success', params: 'Hello world', headers: { + 'Host' => 'www.example.com', + 'Date' => 'Wed, 20 Dec 2023 10:00:00 GMT', + 'Digest' => digest_header, + 'Signature' => signature_header, + } + + expect(body_as_json).to match( + signed_request: true, + signature_actor_id: nil, + error: 'Mastodon requires the Digest header to be signed when doing a POST request' + ) + end + end + + context 'with a tampered body on a POST request' do + let(:digest_header) { 'SHA-256=ZOyIygCyaOW6GjVnihtTFtIS9PNmskdyMlNKiuyjfzw=' } + let(:signature_header) do + 'keyId="https://remote.domain/users/bob#main-key",algorithm="rsa-sha256",headers="host date digest (request-target)",signature="gmhMjgMROGElJU3fpehV2acD5kMHeELi8EFP2UPHOdQ54H0r55AxIpji+J3lPe+N2qSb/4H1KXIh6f0lRu8TGSsu12OQmg5hiO8VA9flcA/mh9Lpk+qwlQZIPRqKP9xUEfqD+Z7ti5wPzDKrWAUK/7FIqWgcT/mlqB1R1MGkpMFc/q4CIs2OSNiWgA4K+Kp21oQxzC2kUuYob04gAZ7cyE/FTia5t08uv6lVYFdRsn4XNPn1MsHgFBwBMRG79ng3SyhoG4PrqBEi5q2IdLq3zfre/M6He3wlCpyO2VJNdGVoTIzeZ0Zz8jUscPV3XtWUchpGclLGSaKaq/JyNZeiYQ=="' # rubocop:disable Layout/LineLength + end + + it 'fails to verify signature', :aggregate_failures do + expect(digest_header).to_not eq digest_value('Hello world!') + expect(signature_header).to eq build_signature_string(actor_keypair, 'https://remote.domain/users/bob#main-key', 'post /activitypub/success', { 'Host' => 'www.example.com', 'Date' => 'Wed, 20 Dec 2023 10:00:00 GMT', 'Digest' => digest_header }) + + post '/activitypub/success', params: 'Hello world!', headers: { + 'Host' => 'www.example.com', + 'Date' => 'Wed, 20 Dec 2023 10:00:00 GMT', + 'Digest' => 'SHA-256=ZOyIygCyaOW6GjVnihtTFtIS9PNmskdyMlNKiuyjfzw=', + 'Signature' => signature_header, + } + + expect(body_as_json).to match( + signed_request: true, + signature_actor_id: nil, + error: 'Invalid Digest value. Computed SHA-256 digest: wFNeS+K3n/2TKRMFQ2v4iTFOSj+uwF7P/Lt98xrZ5Ro=; given: ZOyIygCyaOW6GjVnihtTFtIS9PNmskdyMlNKiuyjfzw=' + ) + end + end + + context 'with a tampered path in a POST request' do + it 'fails to verify signature', :aggregate_failures do + post '/activitypub/alternative-path', params: 'Hello world', headers: { + 'Host' => 'www.example.com', + 'Date' => 'Wed, 20 Dec 2023 10:00:00 GMT', + 'Digest' => 'SHA-256=ZOyIygCyaOW6GjVnihtTFtIS9PNmskdyMlNKiuyjfzw=', + 'Signature' => 'keyId="https://remote.domain/users/bob#main-key",algorithm="rsa-sha256",headers="host date digest (request-target)",signature="gmhMjgMROGElJU3fpehV2acD5kMHeELi8EFP2UPHOdQ54H0r55AxIpji+J3lPe+N2qSb/4H1KXIh6f0lRu8TGSsu12OQmg5hiO8VA9flcA/mh9Lpk+qwlQZIPRqKP9xUEfqD+Z7ti5wPzDKrWAUK/7FIqWgcT/mlqB1R1MGkpMFc/q4CIs2OSNiWgA4K+Kp21oQxzC2kUuYob04gAZ7cyE/FTia5t08uv6lVYFdRsn4XNPn1MsHgFBwBMRG79ng3SyhoG4PrqBEi5q2IdLq3zfre/M6He3wlCpyO2VJNdGVoTIzeZ0Zz8jUscPV3XtWUchpGclLGSaKaq/JyNZeiYQ=="', # rubocop:disable Layout/LineLength + } + + expect(response).to have_http_status(200) + expect(body_as_json).to match( + signed_request: true, + signature_actor_id: nil, + error: anything + ) + end + end + end + + context 'with an inaccessible key' do + before do + stub_request(:get, 'https://remote.domain/users/alice#main-key').to_return(status: 404) + end + + it 'fails to verify signature', :aggregate_failures do + get '/activitypub/success', headers: { + 'Host' => 'www.example.com', + 'Date' => 'Wed, 20 Dec 2023 10:00:00 GMT', + 'Signature' => 'keyId="https://remote.domain/users/alice#main-key",algorithm="rsa-sha256",headers="date host (request-target)",signature="Z8ilar3J7bOwqZkMp7sL8sRs4B1FT+UorbmvWoE+A5UeoOJ3KBcUmbsh+k3wQwbP5gMNUrra9rEWabpasZGphLsbDxfbsWL3Cf0PllAc7c1c7AFEwnewtExI83/qqgEkfWc2z7UDutXc2NfgAx89Ox8DXU/fA2GG0jILjB6UpFyNugkY9rg6oI31UnvfVi3R7sr3/x8Ea3I9thPvqI2byF6cojknSpDAwYzeKdngX3TAQEGzFHz3SDWwyp3jeMWfwvVVbM38FxhvAnSumw7YwWW4L7M7h4M68isLimoT3yfCn2ucBVL5Dz8koBpYf/40w7QidClAwCafZQFC29yDOg=="', # rubocop:disable Layout/LineLength + } + + expect(body_as_json).to match( + signed_request: true, + signature_actor_id: nil, + error: 'Unable to fetch key JSON at https://remote.domain/users/alice#main-key' + ) + end + end + + private + + def stub_tests_controller + stub_const('ActivityPub::TestsController', activitypub_tests_controller) + + Rails.application.routes.draw do + # NOTE: RouteSet#draw removes all routes, so we need to re-insert one + resource :instance_actor, path: 'actor', only: [:show] + + match :via => [:get, :post], '/activitypub/success' => 'activitypub/tests#success' + match :via => [:get, :post], '/activitypub/alternative-path' => 'activitypub/tests#alternative_success' + match :via => [:get, :post], '/activitypub/signature_required' => 'activitypub/tests#signature_required' + end + end + + def activitypub_tests_controller + Class.new(ApplicationController) do + include SignatureVerification + + before_action :require_actor_signature!, only: [:signature_required] + + def success + render json: { + signed_request: signed_request?, + signature_actor_id: signed_request_actor&.id&.to_s, + }.merge(signature_verification_failure_reason || {}) + end + + alias_method :alternative_success, :success + alias_method :signature_required, :success + end + end + + def digest_value(body) + "SHA-256=#{Digest::SHA256.base64digest(body)}" + end + + def build_signature_string(keypair, key_id, request_target, headers) + algorithm = 'rsa-sha256' + signed_headers = headers.merge({ '(request-target)' => request_target }) + signed_string = signed_headers.map { |key, value| "#{key.downcase}: #{value}" }.join("\n") + signature = Base64.strict_encode64(keypair.sign(OpenSSL::Digest.new('SHA256'), signed_string)) + + "keyId=\"#{key_id}\",algorithm=\"#{algorithm}\",headers=\"#{signed_headers.keys.join(' ').downcase}\",signature=\"#{signature}\"" + end +end