From patchwork Thu Dec 23 01:39:19 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nayna Jain X-Patchwork-Id: 12697875 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E0609C43219 for ; Thu, 23 Dec 2021 01:39:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242448AbhLWBjq (ORCPT ); Wed, 22 Dec 2021 20:39:46 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:40504 "EHLO mx0b-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239866AbhLWBjp (ORCPT ); Wed, 22 Dec 2021 20:39:45 -0500 Received: from pps.filterd (m0127361.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 1BN172d7002332; Thu, 23 Dec 2021 01:39:42 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=8R4K9C9ZuDPbuJe6V0JoqAmBwLKXgc7zt8sYMRwfRbs=; b=GpWFH2mNrf8FeLf8P1UyYACBAcZzBu2Gbh1la1ZDUZnxBg7JM/9wsjZ1lTwIo4iuoFP4 UKdEcV7819Q2phh3Usbhro5PDsL0TxMu0KetUFqHHTvgE1LCsu4RxfaKXaS2eZ0HsGNa lUYu6HWGBQAcpvfhuk073xFx17uGrc0gvA84wh+xhwlngPkavkstHRnxpqUMocJaR+nJ vTe1TgTdr5/0yQOpl34LJ8oo8C2FR0ifLD0Lwm9/QDudFbH8OSlN8KTndaLANfk/NGZx 2/W4vkcRMhNaHds5j3MBryyotLbfdsAmI2SvvApDNkXXFDLCthrWOHwG5b4X0NTswXz5 hA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 3d4d1kjd6v-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 23 Dec 2021 01:39:41 +0000 Received: from m0127361.ppops.net (m0127361.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.43/8.16.0.43) with SMTP id 1BN1ZRgL007146; Thu, 23 Dec 2021 01:39:41 GMT Received: from ppma04fra.de.ibm.com (6a.4a.5195.ip4.static.sl-reverse.com [149.81.74.106]) by mx0a-001b2d01.pphosted.com with ESMTP id 3d4d1kjd67-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 23 Dec 2021 01:39:41 +0000 Received: from pps.filterd (ppma04fra.de.ibm.com [127.0.0.1]) by ppma04fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 1BN1buXP013247; Thu, 23 Dec 2021 01:39:39 GMT Received: from b06cxnps4075.portsmouth.uk.ibm.com (d06relay12.portsmouth.uk.ibm.com [9.149.109.197]) by ppma04fra.de.ibm.com with ESMTP id 3d179agvxq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 23 Dec 2021 01:39:39 +0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 1BN1dao148628034 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 23 Dec 2021 01:39:36 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 168924C058; Thu, 23 Dec 2021 01:39:36 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 14B7A4C044; Thu, 23 Dec 2021 01:39:34 +0000 (GMT) Received: from li-4b5937cc-25c4-11b2-a85c-cea3a66903e4.ibm.com.com (unknown [9.211.41.75]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 23 Dec 2021 01:39:33 +0000 (GMT) From: Nayna Jain To: linux-integrity@vger.kernel.org, keyrings@vger.kernel.org Cc: dhowells@redhat.com, zohar@linux.ibm.com, jarkko@kernel.org, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, dimitri.ledkov@canonical.com, seth@forshee.me, Nayna Jain Subject: [PATCH v6 3/3] integrity: support including firmware ".platform" keys at build time Date: Wed, 22 Dec 2021 20:39:19 -0500 Message-Id: <20211223013919.206273-4-nayna@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20211223013919.206273-1-nayna@linux.ibm.com> References: <20211223013919.206273-1-nayna@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: Tiu-Tvb1lZFYknj1zXoXXef9FleVPNdk X-Proofpoint-GUID: -u2GjD4n9vCSBYYGotqnK8m4Z61K1vGU X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.790,Hydra:6.0.425,FMLib:17.11.62.513 definitions=2021-12-22_09,2021-12-22_01,2021-12-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 bulkscore=0 adultscore=0 clxscore=1015 impostorscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 suspectscore=0 mlxlogscore=999 malwarescore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2110150000 definitions=main-2112230005 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Allow firmware keys to be embedded in the Linux kernel and loaded onto the ".platform" keyring on boot. The firmware keys can be specified in a file as a list of PEM encoded certificates using new config INTEGRITY_PLATFORM_KEYS. The certificates are embedded in the image by converting the PEM-formatted certificates into DER(binary) and generating security/integrity/platform_certs/platform_certificate_list file at build time. On boot, the embedded certs from the image are loaded onto the ".platform" keyring. Reviewed-by: Mimi Zohar Signed-off-by: Nayna Jain --- security/integrity/Kconfig | 10 +++++++ security/integrity/Makefile | 17 +++++++++++- .../integrity/platform_certs/platform_cert.S | 23 ++++++++++++++++ .../platform_certs/platform_keyring.c | 26 +++++++++++++++++++ 4 files changed, 75 insertions(+), 1 deletion(-) create mode 100644 security/integrity/platform_certs/platform_cert.S diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig index 71f0177e8716..9fccf1368b8a 100644 --- a/security/integrity/Kconfig +++ b/security/integrity/Kconfig @@ -62,6 +62,16 @@ config INTEGRITY_PLATFORM_KEYRING provided by the platform for verifying the kexec'ed kerned image and, possibly, the initramfs signature. +config INTEGRITY_PLATFORM_KEYS + string "Builtin X.509 keys for .platform keyring" + depends on KEYS + depends on ASYMMETRIC_KEY_TYPE + depends on INTEGRITY_PLATFORM_KEYRING + help + If set, this option should be the filename of a PEM-formatted file + containing X.509 certificates to be loaded onto the ".platform" + keyring. + config LOAD_UEFI_KEYS depends on INTEGRITY_PLATFORM_KEYRING depends on EFI diff --git a/security/integrity/Makefile b/security/integrity/Makefile index 7ee39d66cf16..46629f5ef4f6 100644 --- a/security/integrity/Makefile +++ b/security/integrity/Makefile @@ -3,13 +3,18 @@ # Makefile for caching inode integrity data (iint) # +quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2)) + cmd_extract_certs = scripts/extract-cert $(2) $@ +$(eval $(call config_filename,INTEGRITY_PLATFORM_KEYS)) + obj-$(CONFIG_INTEGRITY) += integrity.o integrity-y := iint.o integrity-$(CONFIG_INTEGRITY_AUDIT) += integrity_audit.o integrity-$(CONFIG_INTEGRITY_SIGNATURE) += digsig.o integrity-$(CONFIG_INTEGRITY_ASYMMETRIC_KEYS) += digsig_asymmetric.o -integrity-$(CONFIG_INTEGRITY_PLATFORM_KEYRING) += platform_certs/platform_keyring.o +integrity-$(CONFIG_INTEGRITY_PLATFORM_KEYRING) += platform_certs/platform_keyring.o \ + platform_certs/platform_cert.o integrity-$(CONFIG_LOAD_UEFI_KEYS) += platform_certs/efi_parser.o \ platform_certs/load_uefi.o \ platform_certs/keyring_handler.o @@ -19,3 +24,13 @@ integrity-$(CONFIG_LOAD_PPC_KEYS) += platform_certs/efi_parser.o \ platform_certs/keyring_handler.o obj-$(CONFIG_IMA) += ima/ obj-$(CONFIG_EVM) += evm/ + + +$(obj)/platform_certs/platform_cert.o: $(obj)/platform_certs/platform_certificate_list + +targets += platform_certificate_list + +$(obj)/platform_certs/platform_certificate_list: scripts/extract-cert $(INTEGRITY_PLATFORM_KEYS_FILENAME) FORCE + $(call if_changed,extract_certs,$(CONFIG_INTEGRITY_PLATFORM_KEYS)) + +clean-files := platform_certs/platform_certificate_list diff --git a/security/integrity/platform_certs/platform_cert.S b/security/integrity/platform_certs/platform_cert.S new file mode 100644 index 000000000000..20bccce5dc5a --- /dev/null +++ b/security/integrity/platform_certs/platform_cert.S @@ -0,0 +1,23 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include +#include + + __INITRODATA + + .align 8 +#ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING + .globl platform_certificate_list +platform_certificate_list: +__cert_list_start: + .incbin "security/integrity/platform_certs/platform_certificate_list" +__cert_list_end: +#endif + + .align 8 + .globl platform_certificate_list_size +platform_certificate_list_size: +#ifdef CONFIG_64BIT + .quad __cert_list_end - __cert_list_start +#else + .long __cert_list_end - __cert_list_start +#endif diff --git a/security/integrity/platform_certs/platform_keyring.c b/security/integrity/platform_certs/platform_keyring.c index bcafd7387729..b45de142c5f5 100644 --- a/security/integrity/platform_certs/platform_keyring.c +++ b/security/integrity/platform_certs/platform_keyring.c @@ -12,8 +12,12 @@ #include #include #include +#include #include "../integrity.h" +extern __initconst const u8 platform_certificate_list[]; +extern __initconst const unsigned long platform_certificate_list_size; + /** * add_to_platform_keyring - Add to platform keyring without validation. * @source: Source of key @@ -37,6 +41,28 @@ void __init add_to_platform_keyring(const char *source, const void *data, pr_info("Error adding keys to platform keyring %s\n", source); } +static __init int load_platform_certificate_list(void) +{ + const u8 *p; + unsigned long size; + int rc; + struct key *keyring; + + p = platform_certificate_list; + size = platform_certificate_list_size; + + keyring = integrity_keyring_from_id(INTEGRITY_KEYRING_PLATFORM); + if (IS_ERR(keyring)) + return PTR_ERR(keyring); + + rc = load_certificate_list(p, size, keyring); + if (rc) + pr_info("Error adding keys to platform keyring %d\n", rc); + + return rc; +} +late_initcall(load_platform_certificate_list); + /* * Create the trusted keyrings. */