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| author | Bart de Water <bart@somnilocode.nl> | 2016-07-27 13:41:40 +0200 |
|---|---|---|
| committer | Bart de Water <bart@somnilocode.nl> | 2016-07-27 13:41:40 +0200 |
| commit | 73209aa7a3abb942e144e358135e5d39a70294fd (patch) | |
| tree | c7a79db37aa5072515d043a60379b371690d00ed /activesupport/lib | |
| parent | 7e6996a1b36cdf8158a27eeaa7e6d97a05994707 (diff) | |
| download | rails-73209aa7a3abb942e144e358135e5d39a70294fd.tar.gz rails-73209aa7a3abb942e144e358135e5d39a70294fd.tar.bz2 rails-73209aa7a3abb942e144e358135e5d39a70294fd.zip | |
Add rationale for manually checking auth_tag length, which got lost when #25874 was squashed before merging [skip ci]
Diffstat (limited to 'activesupport/lib')
| -rw-r--r-- | activesupport/lib/active_support/message_encryptor.rb | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/message_encryptor.rb b/activesupport/lib/active_support/message_encryptor.rb index 87efe117c5..1f2736388d 100644 --- a/activesupport/lib/active_support/message_encryptor.rb +++ b/activesupport/lib/active_support/message_encryptor.rb @@ -99,6 +99,10 @@ module ActiveSupport def _decrypt(encrypted_message) cipher = new_cipher encrypted_data, iv, auth_tag = encrypted_message.split("--".freeze).map {|v| ::Base64.strict_decode64(v)} + + # Currently the OpenSSL bindings do not raise an error if auth_tag is + # truncated, which would allow an attacker to easily forge it. See + # https://github.com/ruby/openssl/issues/63 raise InvalidMessage if aead_mode? && auth_tag.bytes.length != 16 cipher.decrypt |