From patchwork Thu Apr 9 10:34:38 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "tianjia.zhang" X-Patchwork-Id: 11481549 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B1BAC1744 for ; Thu, 9 Apr 2020 10:34:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9B46D20857 for ; Thu, 9 Apr 2020 10:34:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726648AbgDIKer (ORCPT ); Thu, 9 Apr 2020 06:34:47 -0400 Received: from out30-56.freemail.mail.aliyun.com ([115.124.30.56]:50441 "EHLO out30-56.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725828AbgDIKer (ORCPT ); Thu, 9 Apr 2020 06:34:47 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R891e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e01419;MF=tianjia.zhang@linux.alibaba.com;NM=1;PH=DS;RN=10;SR=0;TI=SMTPD_---0Tv2Jng._1586428480; Received: from localhost(mailfrom:tianjia.zhang@linux.alibaba.com fp:SMTPD_---0Tv2Jng._1586428480) by smtp.aliyun-inc.com(127.0.0.1); Thu, 09 Apr 2020 18:34:41 +0800 From: Tianjia Zhang To: zohar@linux.ibm.com, dmitry.kasatkin@gmail.com, jmorris@namei.org, serge@hallyn.com, zhangliguang@linux.alibaba.com, zhang.jia@linux.alibaba.com Cc: linux-integrity@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, tianjia.zhang@linux.alibaba.com Subject: [PATCH v2 0/2] support to read and tune appraise mode in runtime Date: Thu, 9 Apr 2020 18:34:38 +0800 Message-Id: <20200409103440.47946-1-tianjia.zhang@linux.alibaba.com> X-Mailer: git-send-email 2.17.1 Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Support the read and write operations of ima_appraise by adding a securifyfs file 'appraise_mode'. In order to tune appraise mode in runtime, writing a PKCS#7 signature corresponding the signed content is required. The content should be off, enforce, log or fix. Given a simple way to archive this: $ echo -n off > mode $ openssl smime -sign -nocerts -noattr -binary \ -in mode -inkey \ -signer -outform der -out mode.p7s $ sudo cat mode.p7s \ > /sys/kernel/security/ima/appraise_mode Note that the signing key must be a trust key located in system trusted keyring. So even the root privilege cannot simply disable the enforcement. --- v2 change: fix build error. Tianjia Zhang (2): ima: support to read appraise mode ima: support to tune appraise mode in runtime security/integrity/ima/ima_fs.c | 140 +++++++++++++++++++++++++++++++- 1 file changed, 139 insertions(+), 1 deletion(-)