From: Eric Snowberg <eric.snowberg@oracle.com>
To: Mimi Zohar <zohar@linux.ibm.com>
Cc: Nayna <nayna@linux.vnet.ibm.com>,
dmitry.kasatkin@gmail.com, jmorris@namei.org, serge@hallyn.com,
dhowells@redhat.com, geert@linux-m68k.org,
gregkh@linuxfoundation.org, nayna@linux.ibm.com,
tglx@linutronix.de, bauerman@linux.ibm.com, mpe@ellerman.id.au,
linux-integrity@vger.kernel.org,
linux-security-module@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH 0/2] ima: uncompressed module appraisal support
Date: Fri, 7 Feb 2020 11:45:14 -0700 [thread overview]
Message-ID: <992E95D5-D4B9-4913-A36F-BB47631DFE0A@oracle.com> (raw)
In-Reply-To: <1581100125.5585.623.camel@linux.ibm.com>
> On Feb 7, 2020, at 11:28 AM, Mimi Zohar <zohar@linux.ibm.com> wrote:
>
> On Fri, 2020-02-07 at 10:49 -0700, Eric Snowberg wrote:
>>
>>> On Feb 7, 2020, at 10:40 AM, Mimi Zohar <zohar@linux.ibm.com> wrote:
>>>
>>>> $ insmod ./foo.ko
>>>> insmod: ERROR: could not insert module ./foo.ko: Permission denied
>>>>
>>>> last entry from audit log:
>>>> type=INTEGRITY_DATA msg=audit(1581089373.076:83): pid=2874 uid=0
>>>> auid=0 ses=1 subj=unconfined_u:unconfined_r:unconfined_t:s0-
>>>> s0:c0.c1023 op=appraise_data cause=invalid-signature comm="insmod"
>>>> name="/root/keys/modules/foo.ko" dev="dm-0" ino=10918365
>>>> res=0^]UID="root" AUID=“root"
>>>>
>>>> This is because modsig_verify() will be called from within
>>>> ima_appraise_measurement(),
>>>> since try_modsig is true. Then modsig_verify() will return
>>>> INTEGRITY_FAIL.
>>>
>>> Why is it an "invalid signature"? For that you need to look at the
>>> kernel messages. Most likely it can't find the public key on the .ima
>>> keyring to verify the signature.
>>
>> It is invalid because the module has not been ima signed.
>
> With the IMA policy rule "appraise func=MODULE_CHECK
> appraise_type=imasig|modsig", IMA first tries to verify the IMA
> signature stored as an xattr and on failure then attempts to verify
> the appended signatures.
>
> The audit message above indicates that there was a signature, but the
> signature validation failed.
>
I do have CONFIG_IMA_APPRAISE_MODSIG enabled. I believe the audit message above
is coming from modsig_verify in security/integrity/ima/ima_appraise.c.
next prev parent reply other threads:[~2020-02-07 18:45 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-06 16:42 [RFC PATCH 0/2] ima: uncompressed module appraisal support Eric Snowberg
2020-02-06 16:42 ` [RFC PATCH 1/2] ima: Implement support for uncompressed module appended signatures Eric Snowberg
2020-02-06 17:07 ` Lakshmi Ramasubramanian
2020-02-06 17:30 ` Eric Snowberg
2020-02-06 18:05 ` Mimi Zohar
2020-02-06 19:01 ` Eric Snowberg
2020-02-06 19:10 ` Mimi Zohar
2020-02-06 16:42 ` [RFC PATCH 2/2] ima: Change default secure_boot policy to include " Eric Snowberg
2020-02-06 20:22 ` [RFC PATCH 0/2] ima: uncompressed module appraisal support Nayna
2020-02-06 21:40 ` Eric Snowberg
2020-02-07 14:51 ` Mimi Zohar
2020-02-07 16:57 ` Eric Snowberg
2020-02-07 17:40 ` Mimi Zohar
2020-02-07 17:49 ` Eric Snowberg
2020-02-07 18:28 ` Mimi Zohar
2020-02-07 18:45 ` Eric Snowberg [this message]
2020-02-07 18:54 ` Mimi Zohar
2020-02-07 21:38 ` Eric Snowberg
2020-02-08 23:43 ` Mimi Zohar
2020-02-10 16:34 ` Eric Snowberg
2020-02-10 17:09 ` Mimi Zohar
2020-02-10 19:24 ` Eric Snowberg
2020-02-10 20:33 ` Mimi Zohar
2020-02-11 17:33 ` Eric Snowberg
2020-02-12 14:04 ` Nayna
2020-02-13 15:32 ` Eric Snowberg
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