gitea/nas
1
0
Fork 2
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions 1

Improvements to signature verification (#9667)

Browse source 
* Refactor signature verification a bit

* Rescue signature verification if recorded public key is invalid

Fixes #8822

* Always re-fetch AP signing key when HTTP Signature verification fails

But when the account is not marked as stale, avoid fetching collections and
media, and avoid webfinger round-trip.

* Apply stoplight to key/account update as well as initial key retrieval
This commit is contained in:
ThibG 2019-01-07 21:45:13 +01:00 • committed by Eugen Rochko
parent cf3c0fc38c
commit 28b482874a
3 changed files with 41 additions and 22 deletions
Download patch file Download diff file Expand all files Collapse all files

45
app/controllers/concerns/signature_verification.rb
View file

@ -60,23 +60,26 @@ module SignatureVerification
signature = Base64.decode64(signature_params['signature'])
compare_signed_string = build_signed_string(signature_params['headers'])
if account.keypair.public_key.verify(OpenSSL::Digest::SHA256.new, signature, compare_signed_string)
@signed_request_account = account
@signed_request_account
elsif account.possibly_stale?
account = account.refresh!
return account unless verify_signature(account, signature, compare_signed_string).nil?
if account.keypair.public_key.verify(OpenSSL::Digest::SHA256.new, signature, compare_signed_string)
@signed_request_account = account
@signed_request_account
else
@signature_verification_failure_reason = "Verification failed for #{account.username}@#{account.domain} #{account.uri}"
@signed_request_account = nil
end
else
@signature_verification_failure_reason = "Verification failed for #{account.username}@#{account.domain} #{account.uri}"
account_stoplight = Stoplight("source:#{request.ip}") { account.possibly_stale? ? account.refresh! : account_refresh_key(account) }
.with_fallback { nil }
.with_threshold(1)
.with_cool_off_time(5.minutes.seconds)
.with_error_handler { |error, handle| error.is_a?(HTTP::Error) ? handle.call(error) : raise(error) }
account = account_stoplight.run
if account.nil?
@signature_verification_failure_reason = "Public key not found for key #{signature_params['keyId']}"
@signed_request_account = nil
return
end
return account unless verify_signature(account, signature, compare_signed_string).nil?
@signature_verification_failure_reason = "Verification failed for #{account.username}@#{account.domain} #{account.uri}"
@signed_request_account = nil
end
def request_body
@ -85,6 +88,15 @@ module SignatureVerification
private
def verify_signature(account, signature, compare_signed_string)
if account.keypair.public_key.verify(OpenSSL::Digest::SHA256.new, signature, compare_signed_string)
@signed_request_account = account
@signed_request_account
end
rescue OpenSSL::PKey::RSAError
nil
end
def build_signed_string(signed_headers)
signed_headers = 'date' if signed_headers.blank?
@ -131,4 +143,9 @@ module SignatureVerification
account
end
end
def account_refresh_key(account)
return if account.local? || !account.activitypub?
ActivityPub::FetchRemoteAccountService.new.call(account.uri, only_key: true)
end
end