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https://issues.apache.org/jira/browse/NIFI-7668?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Handermann updated NIFI-7668:
-----------------------------------
Status: Patch Available (was: In Progress)
Submitted PR adding support for PBKDF2 and Scrypt Key Derivation Functions that
can be configured through the existing {{nifi.sensitive.props.algorithm}}
property. The PR uses the default configuration parameters for these functions
and updates the Admin Guide with details.
> Add configurable PBE AEAD algorithms to flow encryption
> -------------------------------------------------------
>
> Key: NIFI-7668
> URL: https://issues.apache.org/jira/browse/NIFI-7668
> Project: Apache NiFi
> Issue Type: Improvement
> Components: Configuration, Core Framework
> Affects Versions: 1.12.0
> Reporter: Andy LoPresto
> Assignee: David Handermann
> Priority: Major
> Labels: aead, configuration, encryption, pbe, security
> Time Spent: 10m
> Remaining Estimate: 0h
>
> NIFI-7638 introduced a single custom PBE algorithm (pair for 128/256-bit
> keys) which provided AEAD semantics using Argon2 for key derivation and
> AES-G/CM for authenticated encryption. This solution was a stop gap to allow
> more robust encryption than AES-CBC without modifying the
> {{EncryptionMethod}}, which is a single definition of encryption algorithms
> and (supposed) KDFs referenced throughout the codebase.
> Introducing changes to {{EncryptionMethod}} would have required massive
> regression testing, further support changes to {{EncryptContent}}, encrypted
> repository implementations, multiple documentation changes, etc. This change
> allows for a single custom algorithm which makes reasonable default decisions
> around cost parameters and algorithm selection, meeting the user requirements
> without demanding far-reaching changes.
> Instead, this ticket proposes an intentional enhancement to the
> {{nifi.properties}} structure to add a new {{nifi.sensitive.props.kdf}}
> property to complement the existing {{nifi.sensitive.props.algorithm}}
> property. This will allow arbitrary secure KDFs (Argon2, bcrypt, scrypt,
> PBKDF2) to be specified with custom cost parameters and combined with any
> keyed encryption algorithm (AES-CBC, AES-G/CM, AES-CTR) to derive a key and
> encrypt the flow sensitive properties.
> For backward compatibility, as this is likely to go in a 1.13.0 release, not
> a major release, an existing {{nifi.properties}} file will work fine. If the
> {{nifi.sensitive.props.kdf}} value is not specified, it will not be used,
> which is acceptable for all existing {{EncryptionMethod}} values which are
> already supported by the {{StringEncryptor}} class. If a _new_ algorithm is
> specified (e.g. one of the raw keyed algorithms), the KDF will need to be
> present and will be checked for appropriateness and cost parameter validity.
> No default value changes will be made. Thus, this will only affect
> security-conscious users who explicitly change those values to reflect more
> robust key derivation and data protection algorithm choices.
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