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https://issues.apache.org/jira/browse/NIFI-1465?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15378173#comment-15378173
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Andy LoPresto commented on NIFI-1465:
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The tool for upgrade should also allow the decryption and re-encryption using
the same algorithm when the sensitive key value changes (i.e. key rollover) as
documented in the mailing list [1].
[1]
https://mail-archives.apache.org/mod_mbox/nifi-users/201607.mbox/%3CSN2PR14MB10889B2BF9E0BEDC1ECC4D7BAB310%40SN2PR14MB1088.namprd14.prod.outlook.com%3E
> Upgrade encryption of sensitive properties
> ------------------------------------------
>
> Key: NIFI-1465
> URL: https://issues.apache.org/jira/browse/NIFI-1465
> Project: Apache NiFi
> Issue Type: Bug
> Components: Core Framework
> Affects Versions: 0.5.0
> Reporter: Andy LoPresto
> Assignee: Andy LoPresto
> Labels: encryption, security
> Original Estimate: 120h
> Remaining Estimate: 120h
>
> Currently, NiFi accepts a password and encryption algorithm in
> `nifi.properties` which are used to encrypt all sensitive processor
> properties throughout the application. The password defaults to empty and the
> algorithm defaults to {{PBEWITHMD5AND256BITAES-CBC-OPENSSL}}. This algorithm:
> * uses a digest function ({{MD5}}) which is not cryptographically secure
> [1][2][3][4]
> * uses a single iteration count [5][6]
> * limits password input to 16 characters on JVMs without the unlimited
> strength cryptographic jurisdiction policy files installed [NIFI-1255]
> all of which combine to make it extremely insecure. We should change the
> default algorithm to use a strong key derivation function (KDF) [7] which
> will properly derive a key to protect the sensitive properties.
> Because existing systems have already encrypted the properties using a key
> derived from the original settings, we should provide a translation/upgrade
> utility to seamlessly convert the stored values from the old password &
> algorithm combination to the new.
> [1] http://security.stackexchange.com/a/19908/16485
> [2] http://security.stackexchange.com/a/31846/16485
> [3]
> http://security.stackexchange.com/questions/52461/how-weak-is-md5-as-a-password-hashing-function
> [4] http://security.stackexchange.com/a/31410/16485
> [5] http://security.stackexchange.com/a/29139/16485
> [6] https://www.openssl.org/docs/manmaster/crypto/EVP_BytesToKey.html
> [7]
> https://cwiki.apache.org/confluence/display/NIFI/Key+Derivation+Function+Explanations
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