[PATCH v6 03/13] KEYS: CA link restriction

Nayna nayna at linux.vnet.ibm.com
Thu Sep 16 20:05:01 UTC 2021

On 9/14/21 5:14 PM, Eric Snowberg wrote:
> Add a new link restriction.  Restrict the addition of keys in a keyring
> based on the key to be added being a CA (self-signed).

A self-signed cert can be a root CA cert or a code-signing cert. The way 
to differentiate a CA cert is by checking BasicConstraints CA:TRUE and 
keyUsage:keyCertSign. Refer to Section Basic Constraints and Key Usage 
in the document - https://datatracker.ietf.org/doc/html/rfc5280.

Thanks & Regards,

      - Nayna

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