linux-kernel - Re: [PATCH v5 04/10] IMA: Updated IMA policy functions to return keyrings option read from the policy

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Date:   Tue, 12 Nov 2019 13:06:03 -0500
From:   Mimi Zohar <zohar@...ux.ibm.com>
To:     Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>,
        dhowells@...hat.com, matthewgarrett@...gle.com, sashal@...nel.org,
        jamorris@...ux.microsoft.com, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 04/10] IMA: Updated IMA policy functions to return
 keyrings option read from the policy

On Tue, 2019-11-12 at 09:47 -0800, Lakshmi Ramasubramanian wrote:
> On 11/12/2019 9:05 AM, Mimi Zohar wrote:
> 
> >>   int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
> >>   		     enum ima_hooks func, int mask, int flags, int *pcr,
> >> -		     struct ima_template_desc **template_desc)
> >> +		     struct ima_template_desc **template_desc,
> >> +		     char **keyrings)
> >>   {
> >>   	struct ima_rule_entry *entry;
> >>   	int action = 0, actmask = flags | (flags << 1);
> >> @@ -527,6 +529,9 @@ int ima_match_policy(struct inode *inode, const struct cred *cred, u32 secid,
> >>   		if ((pcr) && (entry->flags & IMA_PCR))
> >>   			*pcr = entry->pcr;
> >>   
> >> +		if ((keyrings) && (entry->flags & IMA_KEYRINGS))
> >> +			*keyrings = entry->keyrings;
> > 
> > ima_match_rules() determines whether the rule is in policy or not. It
> > returns true on rule match, false on failure.  There's no need to
> > return the list of keyrings.
> 
> But the above code change is in ima_match_policy() - not in 
> ima_match_rules() function.
> 
> ima_match_rules() function is updated in Patch #1 -
> [PATCH v5 01/10] IMA: Added KEYRING_CHECK func in IMA policy to measure keys
> 
> I've updated that function to check if func is "KEYRING_CHECK" and 
> return true\false as appropriate.
> 
> Am I missing something?

The first patch adds basic support for the new "func".  This allows
measuring all keys.  ima_match_rules() then needs to be updated in the
patch that adds the "keyrings=" or "keyring=" support to limit it to a
specific keyring.

Mimi