Andy LoPresto created NIFI-3367:
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Summary: TLS Toolkit should enforce minimum length restriction on
CA token
Key: NIFI-3367
URL: https://issues.apache.org/jira/browse/NIFI-3367
Project: Apache NiFi
Issue Type: Bug
Components: Tools and Build
Affects Versions: 1.1.1
Reporter: Andy LoPresto
The TLS Toolkit uses a shared secret "token" when running in client/server mode
in order to perform pre-authentication when requesting a signed certificate
from the CA. There is a validation that this token is *required*, but not that
it is of a certain length. Because the HMAC construction is available in the
source code, the process could easily be brute-forced if the token value is
short. We should enforce a minimum length of 16 bytes (regardless if read from
{{config.json}} or provided via command line).
We may also want to add exponential rate-limiting on failed HMAC values for the
same requested public key DN in order to mitigate malicious requests.
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