From patchwork Tue Apr 2 18:15:05 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claudio Carvalho X-Patchwork-Id: 10882155 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AE8D3922 for ; Tue, 2 Apr 2019 18:15:33 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 989B6288D8 for ; Tue, 2 Apr 2019 18:15:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 8CAC5288F4; Tue, 2 Apr 2019 18:15:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 58441288D8 for ; Tue, 2 Apr 2019 18:15:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730897AbfDBSP2 (ORCPT ); Tue, 2 Apr 2019 14:15:28 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:54074 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730846AbfDBSP1 (ORCPT ); Tue, 2 Apr 2019 14:15:27 -0400 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x32I9UDo063639 for ; Tue, 2 Apr 2019 14:15:27 -0400 Received: from e13.ny.us.ibm.com (e13.ny.us.ibm.com [129.33.205.203]) by mx0a-001b2d01.pphosted.com with ESMTP id 2rmc12tjen-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Tue, 02 Apr 2019 14:15:26 -0400 Received: from localhost by e13.ny.us.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) Tue, 2 Apr 2019 19:15:21 +0100 Received: from b01ledav004.gho.pok.ibm.com (b01ledav004.gho.pok.ibm.com [9.57.199.109]) by b01cxnp22035.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x32IFKfR18677974 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 2 Apr 2019 18:15:20 GMT Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 695CB112065; Tue, 2 Apr 2019 18:15:20 +0000 (GMT) Received: from b01ledav004.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9D979112061; Tue, 2 Apr 2019 18:15:18 +0000 (GMT) Received: from rino.br.ibm.com (unknown [9.18.235.111]) by b01ledav004.gho.pok.ibm.com (Postfix) with ESMTP; Tue, 2 Apr 2019 18:15:18 +0000 (GMT) From: Claudio Carvalho To: linuxppc-dev@ozlabs.org, linux-efi@vger.kernel.org, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Michael Ellerman , Paul Mackerras , Benjamin Herrenschmidt , Ard Biesheuvel , Jeremy Kerr , Matthew Garret , Claudio Carvalho , Nayna Jain Subject: [PATCH 4/4] powerpc: Add support to initialize ima policy rules Date: Tue, 2 Apr 2019 15:15:05 -0300 X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190402181505.25037-1-cclaudio@linux.ibm.com> References: <20190402181505.25037-1-cclaudio@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 x-cbid: 19040218-0064-0000-0000-000003C58181 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00010862; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000284; SDB=6.01183360; UDB=6.00619523; IPR=6.00964108; MB=3.00026264; MTD=3.00000008; XFM=3.00000015; UTC=2019-04-02 18:15:24 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19040218-0065-0000-0000-00003CECEC9A Message-Id: <20190402181505.25037-5-cclaudio@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-04-02_07:,, 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=1011 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904020121 Sender: linux-integrity-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Nayna Jain PowerNV secure boot relies on the kernel IMA security subsystem to perform the OS kernel image signature verification. Since each secure boot mode has different IMA policy requirements, dynamic definition of the policy rules based on the runtime secure boot mode of the system is required. On systems that support secure boot, but have it disabled, only measurement policy rules of the kernel image and modules are defined. This patch defines the arch-specific implementation to retrieve the secure boot mode of the system and accordingly configures the IMA policy rules. This patch will provide arch-specific IMA policies if PPC_SECURE_BOOT config is enabled. Signed-off-by: Nayna Jain --- arch/powerpc/Kconfig | 12 ++++++++ arch/powerpc/kernel/Makefile | 1 + arch/powerpc/kernel/ima_arch.c | 54 ++++++++++++++++++++++++++++++++++ include/linux/ima.h | 3 +- 4 files changed, 69 insertions(+), 1 deletion(-) create mode 100644 arch/powerpc/kernel/ima_arch.c diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 2d0be82c3061..e0ba9a9114b3 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -901,6 +901,18 @@ config PPC_MEM_KEYS If unsure, say y. +config PPC_SECURE_BOOT + prompt "Enable PowerPC Secure Boot" + bool + default n + depends on IMA + depends on IMA_ARCH_POLICY + help + Linux on POWER with firmware secure boot enabled needs to define + security policies to extend secure boot to the OS. + This config allows user to enable OS Secure Boot on PowerPC systems + that have firmware secure boot support. + endmenu config ISA_DMA_API diff --git a/arch/powerpc/kernel/Makefile b/arch/powerpc/kernel/Makefile index cddadccf551d..0f08ed7dfd1b 100644 --- a/arch/powerpc/kernel/Makefile +++ b/arch/powerpc/kernel/Makefile @@ -119,6 +119,7 @@ ifdef CONFIG_IMA obj-y += ima_kexec.o endif endif +obj-$(CONFIG_IMA) += ima_arch.o obj-$(CONFIG_AUDIT) += audit.o obj64-$(CONFIG_AUDIT) += compat_audit.o diff --git a/arch/powerpc/kernel/ima_arch.c b/arch/powerpc/kernel/ima_arch.c new file mode 100644 index 000000000000..871b321656fb --- /dev/null +++ b/arch/powerpc/kernel/ima_arch.c @@ -0,0 +1,54 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2019 IBM Corporation + * Author: Nayna Jain + * + * ima_arch.c + * - initialize ima policies for PowerPC Secure Boot + */ + +#include +#include + +bool arch_ima_get_secureboot(void) +{ + bool sb_mode; + + sb_mode = get_powerpc_sb_mode(); + if (sb_mode) + return true; + else + return false; +} + +/* + * File signature verification is not needed, include only measurements + */ +static const char *const default_arch_rules[] = { + "measure func=KEXEC_KERNEL_CHECK", + "measure func=MODULE_CHECK", + NULL +}; + +/* Both file signature verification and measurements are needed */ +static const char *const sb_arch_rules[] = { + "measure func=KEXEC_KERNEL_CHECK", + "measure func=MODULE_CHECK", + "appraise func=KEXEC_KERNEL_CHECK appraise_type=imasig", +#if !IS_ENABLED(CONFIG_MODULE_SIG) + "appraise func=MODULE_CHECK appraise_type=imasig", +#endif + NULL +}; + +/* + * On PowerPC, file measurements are to be added to the IMA measurement list + * irrespective of the secure boot state of the system. Signature verification + * is conditionally enabled based on the secure boot state. + */ +const char *const *arch_get_ima_policy(void) +{ + if (IS_ENABLED(CONFIG_IMA_ARCH_POLICY) && arch_ima_get_secureboot()) + return sb_arch_rules; + return default_arch_rules; +} diff --git a/include/linux/ima.h b/include/linux/ima.h index dc12fbcf484c..32f46d69ebd7 100644 --- a/include/linux/ima.h +++ b/include/linux/ima.h @@ -31,7 +31,8 @@ extern void ima_post_path_mknod(struct dentry *dentry); extern void ima_add_kexec_buffer(struct kimage *image); #endif -#if defined(CONFIG_X86) && defined(CONFIG_EFI) +#if defined(CONFIG_X86) && defined(CONFIG_EFI) \ + || defined(CONFIG_PPC_SECURE_BOOT) extern bool arch_ima_get_secureboot(void); extern const char * const *arch_get_ima_policy(void); #else