linux-kernel - Re: [PATCH] audit: add containerid support for IMA-audit

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Message-Id: <1347e0c5-40c9-34a4-9c54-60bd2917b2d7@linux.vnet.ibm.com>
Date:   Fri, 18 May 2018 10:52:34 -0400
From:   Stefan Berger <stefanb@...ux.vnet.ibm.com>
To:     Mimi Zohar <zohar@...ux.vnet.ibm.com>,
        Richard Guy Briggs <rgb@...hat.com>
Cc:     containers@...ts.linux-foundation.org,
        Linux-Audit Mailing List <linux-audit@...hat.com>,
        linux-integrity <linux-integrity@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>, paul@...l-moore.com,
        sgrubb@...hat.com
Subject: Re: [PATCH] audit: add containerid support for IMA-audit

On 05/18/2018 10:39 AM, Mimi Zohar wrote:
> On Fri, 2018-05-18 at 09:54 -0400, Stefan Berger wrote:
>> On 05/18/2018 08:53 AM, Mimi Zohar wrote:
> [..]
>
>>>>>> If so, which ones? We could probably refactor the current
>>>>>> integrity_audit_message() and have ima_parse_rule() call into it to get
>>>>>> those fields as well. I suppose adding new fields to it wouldn't be
>>>>>> considered breaking user space?
>>>>> Changing the order of existing fields or inserting fields could break
>>>>> stuff and is strongly discouraged without a good reason, but appending
>>>>> fields is usually the right way to add information.
>>>>>
>>>>> There are exceptions, and in this case, I'd pick the "more standard" of
>>>>> the formats for AUDIT_INTEGRITY_RULE (ima_audit_measurement?) and stick
>>>>> with that, abandoning the other format, renaming the less standard
>>>>> version of the record (ima_parse_rule?) and perhpas adopting that
>>>>> abandonned format for the new record type while using
>>>>> current->audit_context.
>>> This sounds right, other than "type=INTEGRITY_RULE" (1805) for
>>> ima_audit_measurement().  Could we rename type=1805 to be
>> So do we want to change both? I thought that what
>> ima_audit_measurement() produces looks ok but may not have a good name
>> for the 'type'. Now in this case I would not want to 'break user space'.
>> The only change I was going to make was to what ima_parse_rule() produces.
> The only change for now is separating the IMA policy rules from the
> IMA-audit messages.
>
> Richard, when the containerid is appended to the IMA-audit messages,
> would we make the audit type name change then?
>
>>> INTEGRITY_AUDIT or INTEGRITY_IMA_AUDIT?  The new type=1806 audit
>>> message could be named INTEGRITY_RULE or, if that would be confusing,
>>> INTEGRITY_POLICY_RULE.
>> For 1806, as we would use it in ima_parse_rule(), we could change that
>> in your patch to INTEGRITY_POLICY_RULE. IMA_POLICY_RULE may be better
>> for IMA to produce but that's inconsistent then.
> Ok

One other question is whether IMA's audit calls should all adhere to 
CONFIG_INTEGRITY_AUDIT. Most do but those two that currently use 
AUDIT_INTEGRITY_RULE do not. Should that be changed as well?

     Stefan