From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 62BF6C48BD6 for ; Tue, 25 Jun 2019 12:57:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3BADD2085A for ; Tue, 25 Jun 2019 12:57:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730057AbfFYM5u (ORCPT ); Tue, 25 Jun 2019 08:57:50 -0400 Received: from lhrrgout.huawei.com ([185.176.76.210]:33034 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728022AbfFYM5u (ORCPT ); Tue, 25 Jun 2019 08:57:50 -0400 Received: from LHREML713-CAH.china.huawei.com (unknown [172.18.7.106]) by Forcepoint Email with ESMTP id 3E2D18746ED2E5F5F6B2; Tue, 25 Jun 2019 13:57:48 +0100 (IST) Received: from [10.220.96.108] (10.220.96.108) by smtpsuk.huawei.com (10.201.108.36) with Microsoft SMTP Server (TLS) id 14.3.408.0; Tue, 25 Jun 2019 13:57:37 +0100 Subject: Re: [PATCH v4 00/14] ima: introduce IMA Digest Lists extension From: Roberto Sassu To: , , CC: , , , , , References: <20190614175513.27097-1-roberto.sassu@huawei.com> <9029dd14-1077-ec89-ddc2-e677e16ad314@huawei.com> Message-ID: <88d368e6-5b3c-0206-23a0-dc3e0aa385f0@huawei.com> Date: Tue, 25 Jun 2019 14:57:45 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.0 MIME-Version: 1.0 In-Reply-To: <9029dd14-1077-ec89-ddc2-e677e16ad314@huawei.com> Content-Type: text/plain; charset="utf-8"; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.220.96.108] X-CFilter-Loop: Reflected Sender: owner-linux-security-module@vger.kernel.org Precedence: bulk List-ID: On 6/17/2019 8:56 AM, Roberto Sassu wrote: > On 6/14/2019 7:54 PM, Roberto Sassu wrote: >> This patch set introduces a new IMA extension called IMA Digest Lists. >> >> At early boot, the extension preloads in kernel memory reference digest >> values, that can be compared with actual file digests when files are >> accessed in the system. >> >> The extension will open for new possibilities: PCR with predictable >> value, >> that can be used for sealing policies associated to data or TPM keys; >> appraisal based on reference digests already provided by Linux >> distribution >> vendors in the software packages. >> >> The first objective can be achieved because the PCR values does not >> depend >> on which and when files are measured: the extension measures digest lists >> sequentially and files whose digest is not in the digest list. >> >> The second objective can be reached because the extension is able to >> extract reference measurements from packages (with a user space tool) and >> use it as a source for appraisal verification as the reference came from >> the security.ima xattr. This approach will also reduce the overhead as >> only >> one signature is verified for many files (as opposed to one signature for >> each file with the current implementation). >> >> This version of the patch set provides a clear separation between current >> and new functionality. First, the new functionality must be explicitly >> enabled from the kernel command line. Second, results of operations >> performed by the extension can be distinguished from those obtained from >> the existing code: measurement entries created by the extension have a >> different PCR; mutable files appraised with the extension have a >> different >> security.ima type. >> >> The review of this patch set should start from patch 11 and 12, which >> modify the IMA-Measure and IMA-Appraise submodules to use digest lists. >> Patch 1 to 5 are prerequisites. Patch 6 to 10 adds support for digest >> lists. Finally, patch 13 introduces two new policies to measure/appraise >> rootfs and patch 14 adds the documentation (including a flow chart to >> show how IMA has been modified). >> >> The user space tools to configure digest lists are available at: >> >> https://github.com/euleros/digest-list-tools/releases/tag/v0.3 >> >> The patch set applies on top of linux-integrity/next-queued-testing >> (73589972b987). >> >> It is necessary to apply also: >> https://patchwork.kernel.org/cover/10957495/ > > Another dependency is: > > https://patchwork.kernel.org/cover/10979341/ > > Roberto I uploaded this patch set and all the required dependencies to: https://github.com/euleros/linux/releases/tag/ima-digest-lists-v4 It should be easy to test. Let me know if you have questions about the installation. Mimi, do you have any thoughts on this version? Thanks Roberto -- HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063 Managing Director: Bo PENG, Jian LI, Yanli SHI