From: Mimi Zohar <zohar@linux.ibm.com> To: Tushar Sugandhi <tusharsu@linux.microsoft.com>, dm-devel@redhat.com, agk@redhat.com, snitzer@redhat.com Cc: linux-integrity@vger.kernel.org, nramas@linux.microsoft.com Subject: Re: [PATCH 7/7] dm: add documentation for IMA measurement support Date: Tue, 20 Jul 2021 22:33:52 -0400 [thread overview] Message-ID: <205b5336d60aee6b3f33ad67b2d0250e104d6779.camel@linux.ibm.com> (raw) In-Reply-To: <20210713004904.8808-8-tusharsu@linux.microsoft.com> Hi Tushar, Mike, On Mon, 2021-07-12 at 17:49 -0700, Tushar Sugandhi wrote: > +Then IMA ASCII measurement log has the following format: > +PCR TEMPLATE_DIGEST TEMPLATE ALG:EVENT_DIGEST EVENT_NAME EVENT_DATA > + > +PCR := Platform Configuration Register, in which the values are registered. > + This is applicable if TPM chip is in use. > +TEMPLATE_DIGEST := Template digest of the IMA record. ^TEMPLATE_DATA_DIGEST > +TEMPLATE := Template that registered the integrity value (e.g. ima-buf). ^TEMPLATE_NAME The template data format consists of: > +ALG:EVENT_DIGEST = Algorithm to compute event digest, followed by digest of event data > +EVENT_NAME := Description of the event (e.g. 'table_load'). > +EVENT_DATA := The event data to be measured. Missing from the document is a way of validating the template data. For example, in the original case of file measurements, the template data contains the file hash, which can be recalculated or verified against an allow list. Other than re-calculating the template data digest based on the template data, and verifying it against the template data digest in the measurement list, would an attestation server be able to verify the template data itself? thanks, Mimi
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From: Mimi Zohar <zohar@linux.ibm.com> To: Tushar Sugandhi <tusharsu@linux.microsoft.com>, dm-devel@redhat.com, agk@redhat.com, snitzer@redhat.com Cc: nramas@linux.microsoft.com, linux-integrity@vger.kernel.org Subject: Re: [dm-devel] [PATCH 7/7] dm: add documentation for IMA measurement support Date: Tue, 20 Jul 2021 22:33:52 -0400 [thread overview] Message-ID: <205b5336d60aee6b3f33ad67b2d0250e104d6779.camel@linux.ibm.com> (raw) In-Reply-To: <20210713004904.8808-8-tusharsu@linux.microsoft.com> Hi Tushar, Mike, On Mon, 2021-07-12 at 17:49 -0700, Tushar Sugandhi wrote: > +Then IMA ASCII measurement log has the following format: > +PCR TEMPLATE_DIGEST TEMPLATE ALG:EVENT_DIGEST EVENT_NAME EVENT_DATA > + > +PCR := Platform Configuration Register, in which the values are registered. > + This is applicable if TPM chip is in use. > +TEMPLATE_DIGEST := Template digest of the IMA record. ^TEMPLATE_DATA_DIGEST > +TEMPLATE := Template that registered the integrity value (e.g. ima-buf). ^TEMPLATE_NAME The template data format consists of: > +ALG:EVENT_DIGEST = Algorithm to compute event digest, followed by digest of event data > +EVENT_NAME := Description of the event (e.g. 'table_load'). > +EVENT_DATA := The event data to be measured. Missing from the document is a way of validating the template data. For example, in the original case of file measurements, the template data contains the file hash, which can be recalculated or verified against an allow list. Other than re-calculating the template data digest based on the template data, and verifying it against the template data digest in the measurement list, would an attestation server be able to verify the template data itself? thanks, Mimi -- dm-devel mailing list dm-devel@redhat.com https://listman.redhat.com/mailman/listinfo/dm-devel
next prev parent reply other threads:[~2021-07-21 2:34 UTC|newest] Thread overview: 65+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-07-13 0:48 [PATCH 0/7] device mapper target measurements using IMA Tushar Sugandhi 2021-07-13 0:48 ` [dm-devel] " Tushar Sugandhi 2021-07-13 0:48 ` [PATCH 1/7] dm: measure data on table load Tushar Sugandhi 2021-07-13 0:48 ` [dm-devel] " Tushar Sugandhi 2021-07-21 2:12 ` Mimi Zohar 2021-07-21 2:12 ` [dm-devel] " Mimi Zohar 2021-07-21 15:42 ` Mike Snitzer 2021-07-21 15:42 ` [dm-devel] " Mike Snitzer 2021-07-21 16:07 ` Mimi Zohar 2021-07-21 16:07 ` [dm-devel] " Mimi Zohar 2021-07-21 21:17 ` Mimi Zohar 2021-07-21 21:17 ` [dm-devel] " Mimi Zohar 2021-07-29 19:58 ` Tushar Sugandhi 2021-07-29 19:58 ` [dm-devel] " Tushar Sugandhi 2021-07-13 0:48 ` [PATCH 2/7] dm: measure data on device resume Tushar Sugandhi 2021-07-13 0:48 ` [dm-devel] " Tushar Sugandhi 2021-07-13 0:49 ` [PATCH 3/7] dm: measure data on device remove Tushar Sugandhi 2021-07-13 0:49 ` [dm-devel] " Tushar Sugandhi 2021-07-13 0:49 ` [PATCH 4/7] dm: measure data on table clear Tushar Sugandhi 2021-07-13 0:49 ` [dm-devel] " Tushar Sugandhi 2021-07-13 0:49 ` [PATCH 5/7] dm: measure data on device rename Tushar Sugandhi 2021-07-13 0:49 ` [dm-devel] " Tushar Sugandhi 2021-07-13 0:49 ` [PATCH 6/7] dm: update target specific status functions to measure data Tushar Sugandhi 2021-07-13 0:49 ` [dm-devel] " Tushar Sugandhi 2021-07-13 1:06 ` Alasdair G Kergon 2021-07-13 1:06 ` [dm-devel] " Alasdair G Kergon 2021-07-14 20:23 ` Tushar Sugandhi 2021-07-14 20:23 ` [dm-devel] " Tushar Sugandhi 2021-07-13 0:49 ` [PATCH 7/7] dm: add documentation for IMA measurement support Tushar Sugandhi 2021-07-13 0:49 ` [dm-devel] " Tushar Sugandhi 2021-07-21 2:33 ` Mimi Zohar [this message] 2021-07-21 2:33 ` Mimi Zohar 2021-07-24 7:25 ` Tushar Sugandhi 2021-07-24 7:25 ` [dm-devel] " Tushar Sugandhi 2021-07-26 16:33 ` Mimi Zohar 2021-07-26 16:33 ` [dm-devel] " Mimi Zohar 2021-07-26 18:28 ` Tushar Sugandhi 2021-07-26 18:28 ` [dm-devel] " Tushar Sugandhi 2021-07-14 11:32 ` [dm-devel] [PATCH 0/7] device mapper target measurements using IMA Thore Sommer 2021-07-14 11:32 ` Thore Sommer 2021-07-14 20:20 ` Tushar Sugandhi 2021-07-14 20:20 ` Tushar Sugandhi 2021-07-27 10:18 ` Thore Sommer 2021-07-27 10:18 ` Thore Sommer 2021-07-27 20:33 ` Alasdair G Kergon 2021-07-27 20:33 ` Alasdair G Kergon 2021-07-28 3:10 ` Tushar Sugandhi 2021-07-28 3:10 ` Tushar Sugandhi 2021-07-28 17:14 ` Thore Sommer 2021-07-28 17:14 ` Thore Sommer 2021-07-29 17:32 ` Tushar Sugandhi 2021-07-29 17:32 ` Tushar Sugandhi 2021-07-28 17:34 ` Thore Sommer 2021-07-28 17:34 ` Thore Sommer 2021-07-28 21:33 ` Alasdair G Kergon 2021-07-28 21:33 ` Alasdair G Kergon 2021-08-02 10:45 ` Thore Sommer 2021-08-02 10:45 ` Thore Sommer 2021-07-29 19:24 ` Tushar Sugandhi 2021-07-29 19:24 ` Tushar Sugandhi 2021-08-02 10:38 ` Thore Sommer 2021-08-02 10:38 ` Thore Sommer 2021-07-20 21:27 ` Mike Snitzer 2021-07-20 21:27 ` [dm-devel] " Mike Snitzer 2021-07-24 6:57 ` Tushar Sugandhi
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