Messages in this thread | | | Subject | Re: [PATCH v2 3/4] KEYS: Added BUILTIN_TRUSTED_KEYS enum to measure keys added to builtin_trusted_keys keyring | From | Mimi Zohar <> | Date | Mon, 28 Oct 2019 13:08:38 -0400 |
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On Mon, 2019-10-28 at 08:12 -0700, Lakshmi Ramasubramanian wrote: > On 10/27/19 7:33 AM, Mimi Zohar wrote: > > > .builtin_trusted_keys is a trusted keyring, which is created by the > > kernel. It cannot be deleted or replaced by userspace, so it should > > be possible to correlate a keyring name with a keyring number on > > policy load. > > Yes - at policy load we can map a keyring name to a keyring number. > > But at runtime we still need to know if the keyring parameter passed to > the IMA hook function is configured to be measured. > > void ima_post_key_create_or_update(struct key *keyring, struct key *key, > unsigned long flags, bool create); > { > => Get the keyring number for the given "keyring".
There is no "getting" involved here. Pass "keyring" to process_buffer_measurement and on to ima_get_action().
> => Check if the keyring number is in the configured IMA policy.
ima_get_action() should do a simple compare of the valued stored in the IMA policy with the value returned by key_serial().
Mimi
> => If yes, measure the key. > => Else, do nothing. > }
> Did I misunderstand what you had stated?
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