From patchwork Thu Oct 24 03:47:09 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nayna Jain X-Patchwork-Id: 11208243 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 EA8B514E5 for ; Thu, 24 Oct 2019 03:47:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C02892166E for ; Thu, 24 Oct 2019 03:47:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2437332AbfJXDrj (ORCPT ); Wed, 23 Oct 2019 23:47:39 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:22156 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S2392407AbfJXDrj (ORCPT ); Wed, 23 Oct 2019 23:47:39 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x9O3lEPs100511 for ; Wed, 23 Oct 2019 23:47:38 -0400 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0b-001b2d01.pphosted.com with ESMTP id 2vu2uxafa1-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 23 Oct 2019 23:47:37 -0400 Received: from localhost by e06smtp04.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Thu, 24 Oct 2019 04:47:31 +0100 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x9O3kt0638469938 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 24 Oct 2019 03:46:55 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6C564AE04D; Thu, 24 Oct 2019 03:47:28 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9E8AAAE045; Thu, 24 Oct 2019 03:47:25 +0000 (GMT) Received: from localhost.localdomain (unknown [9.40.192.65]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 24 Oct 2019 03:47:25 +0000 (GMT) From: Nayna Jain To: linuxppc-dev@ozlabs.org, linux-efi@vger.kernel.org, linux-integrity@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Michael Ellerman , Benjamin Herrenschmidt , Paul Mackerras , Ard Biesheuvel , Jeremy Kerr , Matthew Garret , Mimi Zohar , Greg Kroah-Hartman , Claudio Carvalho , George Wilson , Elaine Palmer , Eric Ricther , "Oliver O'Halloran" , Nayna Jain , Prakhar Srivastava , Lakshmi Ramasubramanian Subject: [PATCH v9 0/8] powerpc: Enabling IMA arch specific secure boot policies Date: Wed, 23 Oct 2019 22:47:09 -0500 X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 19102403-0016-0000-0000-000002BC7C2C X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19102403-0017-0000-0000-0000331DBEBF Message-Id: <20191024034717.70552-1-nayna@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-10-24_02:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1908290000 definitions=main-1910240033 Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org This patchset extends the previous version[1] by adding support for checking against a blacklist of binary hashes. The IMA subsystem supports custom, built-in, arch-specific policies to define the files to be measured and appraised. These policies are honored based on priority, where arch-specific policy is the highest and custom is the lowest. PowerNV system uses a Linux-based bootloader to kexec the OS. The bootloader kernel relies on IMA for signature verification of the OS kernel before doing the kexec. This patchset adds support for powerpc arch-specific IMA policies that are conditionally defined based on a system's secure boot and trusted boot states. The OS secure boot and trusted boot states are determined via device-tree properties. The verification needs to be performed only for binaries that are not blacklisted. The kernel currently only checks against the blacklist of keys. However, doing so results in blacklisting all the binaries that are signed by the same key. In order to prevent just one particular binary from being loaded, it must be checked against a blacklist of binary hashes. This patchset also adds support to IMA for checking against a hash blacklist for files. signed by appended signature. [1] http://patchwork.ozlabs.org/cover/1149262/ Changelog: v9: * Includes feedbacks from Michael * fix the missing of_node_put() * Includes Mimi's feedbacks * fix the policy show() function to display check_blacklist * fix the other comment related and patch description * add the example of blacklist in the Patch 7/8 Note: Patch 7/8 is giving errors when checkpatch.pl is run because of the format of showing measurement record as part of the example. I am not very sure if that can be fixed as we need to represent the measurements as is. v8: * Updates the Patch Description as per Michael's and Mimi's feedback * Includes feedbacks from Michael for the device tree and policies * removes the arch-policy hack by defining three arrays. * fixes related to device-tree calls * other code specific feedbacks * Includes feedbacks from Mimi on the blacklist * generic blacklist function is modified than previous version * other coding fixes v7: * Removes patch related to dt-bindings as per input from Rob Herring. * fixes Patch 1/8 to use new device-tree updates as per Oliver feedback to device-tree documentation in skiboot mailing list. (https://lists.ozlabs.org/pipermail/skiboot/2019-September/015329.html) * Includes feedbacks from Mimi, Thiago * moves function get_powerpc_fw_sb_node() from Patch 1 to Patch 3 * fixes Patch 2/8 to use CONFIG_MODULE_SIG_FORCE. * updates Patch description in Patch 5/8 * adds a new patch to add wrapper is_binary_blacklisted() * removes the patch that deprecated permit_directio v6: * includes feedbacks from Michael Ellerman on the patchset v5 * removed email ids from comments * add the doc for the device-tree * renames the secboot.c to secure_boot.c and secboot.h to secure_boot.h * other code specific fixes * split the patches to differentiate between secureboot and trustedboot state of the system * adds the patches to support the blacklisting of the binary hash. v5: * secureboot state is now read via device tree entry rather than OPAL secure variables * ima arch policies are updated to use policy based template for measurement rules v4: * Fixed the build issue as reported by Satheesh Rajendran. v3: * OPAL APIs in Patch 1 are updated to provide generic interface based on key/keylen. This patchset updates kernel OPAL APIs to be compatible with generic interface. * Patch 2 is cleaned up to use new OPAL APIs. * Since OPAL can support different types of backend which can vary in the variable interpretation, the Patch 2 is updated to add a check for the backend version * OPAL API now expects consumer to first check the supported backend version before calling other secvar OPAL APIs. This check is now added in patch 2. * IMA policies in Patch 3 is updated to specify appended signature and per policy template. * The patches now are free of any EFIisms. v2: * Removed Patch 1: powerpc/include: Override unneeded early ioremap functions * Updated Subject line and patch description of the Patch 1 of this series * Removed dependency of OPAL_SECVAR on EFI, CPU_BIG_ENDIAN and UCS2_STRING * Changed OPAL APIs from static to non-static. Added opal-secvar.h for the same * Removed EFI hooks from opal_secvar.c * Removed opal_secvar_get_next(), opal_secvar_enqueue() and opal_query_variable_info() function * get_powerpc_sb_mode() in secboot.c now directly calls OPAL Runtime API rather than via EFI hooks. * Fixed log messages in get_powerpc_sb_mode() function. * Added dependency for PPC_SECURE_BOOT on configs PPC64 and OPAL_SECVAR * Replaced obj-$(CONFIG_IMA) with obj-$(CONFIG_PPC_SECURE_BOOT) in arch/powerpc/kernel/Makefile Nayna Jain (8): powerpc: detect the secure boot mode of the system powerpc/ima: add support to initialize ima policy rules powerpc: detect the trusted boot state of the system powerpc/ima: define trusted boot policy ima: make process_buffer_measurement() generic certs: add wrapper function to check blacklisted binary hash ima: check against blacklisted hashes for files with modsig powerpc/ima: update ima arch policy to check for blacklist Documentation/ABI/testing/ima_policy | 4 ++ arch/powerpc/Kconfig | 11 ++++ arch/powerpc/include/asm/secure_boot.h | 29 ++++++++++ arch/powerpc/kernel/Makefile | 2 + arch/powerpc/kernel/ima_arch.c | 74 ++++++++++++++++++++++++++ arch/powerpc/kernel/secure_boot.c | 58 ++++++++++++++++++++ certs/blacklist.c | 9 ++++ include/keys/system_keyring.h | 6 +++ include/linux/ima.h | 3 +- security/integrity/ima/ima.h | 11 ++++ security/integrity/ima/ima_appraise.c | 33 ++++++++++++ security/integrity/ima/ima_main.c | 63 ++++++++++++++-------- security/integrity/ima/ima_policy.c | 12 ++++- security/integrity/integrity.h | 1 + 14 files changed, 291 insertions(+), 25 deletions(-) create mode 100644 arch/powerpc/include/asm/secure_boot.h create mode 100644 arch/powerpc/kernel/ima_arch.c create mode 100644 arch/powerpc/kernel/secure_boot.c