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Refactor ActivityPub handling to prepare for non-Account actors (#19212)

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* Move ActivityPub::FetchRemoteAccountService to ActivityPub::FetchRemoteActorService

ActivityPub::FetchRemoteAccountService is kept as a wrapper for when the actor is
specifically required to be an Account

* Refactor SignatureVerification to allow non-Account actors

* fixup! Move ActivityPub::FetchRemoteAccountService to ActivityPub::FetchRemoteActorService

* Refactor ActivityPub::FetchRemoteKeyService to potentially return non-Account actors

* Refactor inbound ActivityPub payload processing to accept non-Account actors

* Refactor inbound ActivityPub processing to accept activities relayed through non-Account

* Refactor how Account key URIs are built

* Refactor Request and drop unused key_id_format parameter

* Rename ActivityPub::Dereferencer `signature_account` to `signature_actor`
This commit is contained in:
Claire 2022-09-21 22:45:57 +02:00 • committed by GitHub
parent 84aff598ea
commit 8cf7006d4e
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41 changed files with 436 additions and 180 deletions
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52
app/controllers/concerns/signature_verification.rb
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@ -45,10 +45,14 @@ module SignatureVerification
end
end
def require_signature!
def require_account_signature!
render plain: signature_verification_failure_reason, status: signature_verification_failure_code unless signed_request_account
end
def require_actor_signature!
render plain: signature_verification_failure_reason, status: signature_verification_failure_code unless signed_request_actor
end
def signed_request?
request.headers['Signature'].present?
end
@ -68,7 +72,11 @@ module SignatureVerification
end
def signed_request_account
return @signed_request_account if defined?(@signed_request_account)
signed_request_actor.is_a?(Account) ? signed_request_actor : nil
end
def signed_request_actor
return @signed_request_actor if defined?(@signed_request_actor)
raise SignatureVerificationError, 'Request not signed' unless signed_request?
raise SignatureVerificationError, 'Incompatible request signature. keyId and signature are required' if missing_required_signature_parameters?
@ -78,22 +86,22 @@ module SignatureVerification
verify_signature_strength!
verify_body_digest!
account = account_from_key_id(signature_params['keyId'])
actor = actor_from_key_id(signature_params['keyId'])
raise SignatureVerificationError, "Public key not found for key #{signature_params['keyId']}" if account.nil?
raise SignatureVerificationError, "Public key not found for key #{signature_params['keyId']}" if actor.nil?
signature = Base64.decode64(signature_params['signature'])
compare_signed_string = build_signed_string
return account unless verify_signature(account, signature, compare_signed_string).nil?
return actor unless verify_signature(actor, signature, compare_signed_string).nil?
account = stoplight_wrap_request { account.possibly_stale? ? account.refresh! : account_refresh_key(account) }
actor = stoplight_wrap_request { actor_refresh_key!(actor) }
raise SignatureVerificationError, "Public key not found for key #{signature_params['keyId']}" if account.nil?
raise SignatureVerificationError, "Public key not found for key #{signature_params['keyId']}" if actor.nil?
return account unless verify_signature(account, signature, compare_signed_string).nil?
return actor unless verify_signature(actor, signature, compare_signed_string).nil?
fail_with! "Verification failed for #{account.username}@#{account.domain} #{account.uri} using rsa-sha256 (RSASSA-PKCS1-v1_5 with SHA-256)"
fail_with! "Verification failed for #{actor.to_log_human_identifier} #{actor.uri} using rsa-sha256 (RSASSA-PKCS1-v1_5 with SHA-256)"
rescue SignatureVerificationError => e
fail_with! e.message
rescue HTTP::Error, OpenSSL::SSL::SSLError => e
@ -112,7 +120,7 @@ module SignatureVerification
def fail_with!(message)
@signature_verification_failure_reason = message
@signed_request_account = nil
@signed_request_actor = nil
end
def signature_params
@ -160,10 +168,10 @@ module SignatureVerification
raise SignatureVerificationError, "Invalid Digest value. Computed SHA-256 digest: #{body_digest}; given: #{sha256[1]}"
end
def verify_signature(account, signature, compare_signed_string)
if account.keypair.public_key.verify(OpenSSL::Digest.new('SHA256'), signature, compare_signed_string)
@signed_request_account = account
@signed_request_account
def verify_signature(actor, signature, compare_signed_string)
if actor.keypair.public_key.verify(OpenSSL::Digest.new('SHA256'), signature, compare_signed_string)
@signed_request_actor = actor
@signed_request_actor
end
rescue OpenSSL::PKey::RSAError
nil
@ -226,7 +234,7 @@ module SignatureVerification
signature_params['keyId'].blank? || signature_params['signature'].blank?
end
def account_from_key_id(key_id)
def actor_from_key_id(key_id)
domain = key_id.start_with?('acct:') ? key_id.split('@').last : key_id
if domain_not_allowed?(domain)
@ -237,13 +245,13 @@ module SignatureVerification
if key_id.start_with?('acct:')
stoplight_wrap_request { ResolveAccountService.new.call(key_id.gsub(/\Aacct:/, ''), suppress_errors: false) }
elsif !ActivityPub::TagManager.instance.local_uri?(key_id)
account = ActivityPub::TagManager.instance.uri_to_resource(key_id, Account)
account = ActivityPub::TagManager.instance.uri_to_actor(key_id)
account ||= stoplight_wrap_request { ActivityPub::FetchRemoteKeyService.new.call(key_id, id: false, suppress_errors: false) }
account
end
rescue Mastodon::PrivateNetworkAddressError => e
raise SignatureVerificationError, "Requests to private network addresses are disallowed (tried to query #{e.host})"
rescue Mastodon::HostValidationError, ActivityPub::FetchRemoteAccountService::Error, ActivityPub::FetchRemoteKeyService::Error, Webfinger::Error => e
rescue Mastodon::HostValidationError, ActivityPub::FetchRemoteActorService::Error, ActivityPub::FetchRemoteKeyService::Error, Webfinger::Error => e
raise SignatureVerificationError, e.message
end
@ -255,12 +263,14 @@ module SignatureVerification
.run
end
def account_refresh_key(account)
return if account.local? || !account.activitypub?
ActivityPub::FetchRemoteAccountService.new.call(account.uri, only_key: true, suppress_errors: false)
def actor_refresh_key!(actor)
return if actor.local? || !actor.activitypub?
return actor.refresh! if actor.respond_to?(:refresh!) && actor.possibly_stale?
ActivityPub::FetchRemoteActorService.new.call(actor.uri, only_key: true, suppress_errors: false)
rescue Mastodon::PrivateNetworkAddressError => e
raise SignatureVerificationError, "Requests to private network addresses are disallowed (tried to query #{e.host})"
rescue Mastodon::HostValidationError, ActivityPub::FetchRemoteAccountService::Error, Webfinger::Error => e
rescue Mastodon::HostValidationError, ActivityPub::FetchRemoteActorService::Error, Webfinger::Error => e
raise SignatureVerificationError, e.message
end
end