From patchwork Fri Mar 4 17:54:03 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nayna Jain X-Patchwork-Id: 12769689 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 EA6F8C4332F for ; Fri, 4 Mar 2022 17:54:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241446AbiCDRzh (ORCPT ); Fri, 4 Mar 2022 12:55:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47048 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241386AbiCDRza (ORCPT ); Fri, 4 Mar 2022 12:55:30 -0500 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 62D1B1C469B; Fri, 4 Mar 2022 09:54:42 -0800 (PST) Received: from pps.filterd (m0098399.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.1.2/8.16.1.2) with SMTP id 224FxggH026501; 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Fri, 4 Mar 2022 17:54:23 +0000 (GMT) Received: from li-4b5937cc-25c4-11b2-a85c-cea3a66903e4.ibm.com.com (unknown [9.211.34.89]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 4 Mar 2022 17:54:22 +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, rnsastry@linux.ibm.com, Nayna Jain Subject: [PATCH v9 3/3] integrity: support including firmware ".platform" keys at build time Date: Fri, 4 Mar 2022 12:54:03 -0500 Message-Id: <20220304175403.20092-4-nayna@linux.ibm.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20220304175403.20092-1-nayna@linux.ibm.com> References: <20220304175403.20092-1-nayna@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: uVgsGNZx49IhH-ha_stUEHVDzckFyfTc X-Proofpoint-ORIG-GUID: 4EUpBORzzrmW3XRNWOhasPQY7-iNoBO9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.816,Hydra:6.0.425,FMLib:17.11.64.514 definitions=2022-03-04_07,2022-03-04_01,2022-02-23_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 priorityscore=1501 suspectscore=0 clxscore=1015 bulkscore=0 phishscore=0 spamscore=0 adultscore=0 lowpriorityscore=0 impostorscore=0 mlxscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2202240000 definitions=main-2203040088 Precedence: bulk List-ID: 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 at late_initcall(), ensuring the platform keyring exists before loading the keys. Reviewed-by: Mimi Zohar Signed-off-by: Nayna Jain --- security/integrity/Kconfig | 10 +++++++ security/integrity/Makefile | 15 ++++++++++- .../integrity/platform_certs/platform_cert.S | 23 ++++++++++++++++ .../platform_certs/platform_keyring.c | 26 +++++++++++++++++++ 4 files changed, 73 insertions(+), 1 deletion(-) create mode 100644 security/integrity/platform_certs/platform_cert.S diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig index 599429f99f99..77b2c22c0e1b 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 INTEGRITY_MACHINE_KEYRING bool "Provide a keyring to which Machine Owner Keys may be added" depends on SECONDARY_TRUSTED_KEYRING diff --git a/security/integrity/Makefile b/security/integrity/Makefile index d0ffe37dc1d6..65bd93301a3a 100644 --- a/security/integrity/Makefile +++ b/security/integrity/Makefile @@ -3,13 +3,17 @@ # Makefile for caching inode integrity data (iint) # +quiet_cmd_extract_certs = CERT $@ + cmd_extract_certs = certs/extract-cert $(2) $@ + obj-$(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_INTEGRITY_MACHINE_KEYRING) += platform_certs/machine_keyring.o integrity-$(CONFIG_LOAD_UEFI_KEYS) += platform_certs/efi_parser.o \ platform_certs/load_uefi.o \ @@ -20,3 +24,12 @@ integrity-$(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: $(CONFIG_INTEGRITY_PLATFORM_KEYS) certs/extract-cert FORCE + $(call if_changed,extract_certs,$(if $(CONFIG_INTEGRITY_PLATFORM_KEYS),$<,"")) + +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. */