Commit 837b6b3c authored by Stan Hu's avatar Stan Hu

Fix attr_encryption key settings

attr_encrypted does different things with `key` depending on what mode you are using:

1. In `:per_attribute_iv_and_salt` mode, it generates a hash with the salt:
https://github.com/attr-encrypted/encryptor/blob/c3a62c4a9e74686dd95e0548f9dc2a361fdc95d1/lib/encryptor.rb#L77.
There is no need to truncate the key to 32 bytes here.

2. In `:per_attribute_iv` mode, it sets the key directly to the password, so
truncation to 32 bytes is necessary.

Closes #47166
parent fd8d9777
......@@ -13,12 +13,12 @@ module Clusters
attr_encrypted :password,
mode: :per_attribute_iv,
key: Settings.attr_encrypted_db_key_base,
key: Settings.attr_encrypted_db_key_base_truncated,
algorithm: 'aes-256-cbc'
attr_encrypted :token,
mode: :per_attribute_iv,
key: Settings.attr_encrypted_db_key_base,
key: Settings.attr_encrypted_db_key_base_truncated,
algorithm: 'aes-256-cbc'
before_validation :enforce_namespace_to_lower_case
......
......@@ -11,7 +11,7 @@ module Clusters
attr_encrypted :access_token,
mode: :per_attribute_iv,
key: Settings.attr_encrypted_db_key_base,
key: Settings.attr_encrypted_db_key_base_truncated,
algorithm: 'aes-256-cbc'
validates :gcp_project_id,
......
---
title: Fix attr_encryption key settings
merge_request:
author:
type: fixed
......@@ -110,17 +110,24 @@ class Settings < Settingslogic
File.expand_path(path, Rails.root)
end
# Returns a 256-bit key for attr_encrypted
def attr_encrypted_db_key_base
# Ruby 2.4+ requires passing in the exact required length for OpenSSL keys
# (https://github.com/ruby/ruby/commit/ce635262f53b760284d56bb1027baebaaec175d1).
# Previous versions quietly truncated the input.
#
# The default mode for the attr_encrypted gem is to use a 256-bit key.
# We truncate the 128-byte string to 32 bytes.
# Ruby 2.4+ requires passing in the exact required length for OpenSSL keys
# (https://github.com/ruby/ruby/commit/ce635262f53b760284d56bb1027baebaaec175d1).
# Previous versions quietly truncated the input.
#
# Use this when using :per_attribute_iv mode for attr_encrypted.
# We have to truncate the string to 32 bytes for a 256-bit cipher.
def attr_encrypted_db_key_base_truncated
Gitlab::Application.secrets.db_key_base[0..31]
end
# This should be used for :per_attribute_salt_and_iv mode. There is no
# need to truncate the key because the encryptor will use the salt to
# generate a hash of the password:
# https://github.com/attr-encrypted/encryptor/blob/c3a62c4a9e74686dd95e0548f9dc2a361fdc95d1/lib/encryptor.rb#L77
def attr_encrypted_db_key_base
Gitlab::Application.secrets.db_key_base
end
private
def base_url(config)
......
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