From patchwork Tue Jan 11 18:03:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Roberto Sassu X-Patchwork-Id: 12710291 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 956BBC4167D for ; Tue, 11 Jan 2022 18:06:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1345417AbiAKSGb (ORCPT ); Tue, 11 Jan 2022 13:06:31 -0500 Received: from frasgout.his.huawei.com ([185.176.79.56]:4402 "EHLO frasgout.his.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1345411AbiAKSEC (ORCPT ); Tue, 11 Jan 2022 13:04:02 -0500 Received: from fraeml714-chm.china.huawei.com (unknown [172.18.147.206]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4JYJQ13qZMz688Bk; Wed, 12 Jan 2022 02:00:25 +0800 (CST) Received: from roberto-ThinkStation-P620.huawei.com (10.204.63.22) by fraeml714-chm.china.huawei.com (10.206.15.33) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Tue, 11 Jan 2022 19:03:58 +0100 From: Roberto Sassu To: , , , CC: , , , , , , , Roberto Sassu Subject: [PATCH 14/14] KEYS: Introduce load_pgp_public_keyring() Date: Tue, 11 Jan 2022 19:03:18 +0100 Message-ID: <20220111180318.591029-15-roberto.sassu@huawei.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20220111180318.591029-1-roberto.sassu@huawei.com> References: <20220111180318.591029-1-roberto.sassu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.204.63.22] X-ClientProxiedBy: lhreml754-chm.china.huawei.com (10.201.108.204) To fraeml714-chm.china.huawei.com (10.206.15.33) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Preload PGP keys from 'pubring.gpg', placed in certs/ of the kernel source directory. Signed-off-by: Roberto Sassu --- certs/Kconfig | 11 +++++++++++ certs/Makefile | 7 +++++++ certs/system_certificates.S | 18 ++++++++++++++++++ certs/system_keyring.c | 21 +++++++++++++++++++++ 4 files changed, 57 insertions(+) diff --git a/certs/Kconfig b/certs/Kconfig index ae7f2e876a31..2f7fa68cd958 100644 --- a/certs/Kconfig +++ b/certs/Kconfig @@ -126,4 +126,15 @@ config SYSTEM_REVOCATION_KEYS containing X.509 certificates to be included in the default blacklist keyring. +config PGP_PRELOAD_PUBLIC_KEYS + bool "Preload PGP public keys" + depends on SYSTEM_TRUSTED_KEYRING + select PGP_PRELOAD + default n + help + Load at boot time the PGP public keys from a reserved area (populated + with the content of 'certs/pubring.gpg' provided at kernel build + time), and add them to the built-in keyring. Invalid keys are ignored + and the loading continues. + endmenu diff --git a/certs/Makefile b/certs/Makefile index 279433783b10..c85e0ff560ca 100644 --- a/certs/Makefile +++ b/certs/Makefile @@ -22,6 +22,13 @@ $(obj)/system_certificates.o: $(obj)/x509_certificate_list # Cope with signing_key.x509 existing in $(srctree) not $(objtree) AFLAGS_system_certificates.o := -I$(srctree) +ifdef CONFIG_PGP_PRELOAD_PUBLIC_KEYS +ifeq ($(shell ls $(srctree)/certs/pubring.gpg 2> /dev/null), $(srctree)/certs/pubring.gpg) +AFLAGS_system_certificates.o += -DHAVE_PUBRING_GPG +$(obj)/system_certificates.o: $(srctree)/certs/pubring.gpg +endif +endif + quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2)) cmd_extract_certs = scripts/extract-cert $(2) $@ diff --git a/certs/system_certificates.S b/certs/system_certificates.S index e1645e6f4d97..03b361bec758 100644 --- a/certs/system_certificates.S +++ b/certs/system_certificates.S @@ -47,3 +47,21 @@ module_cert_size: #else .long __module_cert_end - __module_cert_start #endif + + .align 8 + .globl pgp_public_keys +pgp_public_keys: +__pgp_key_list_start: +#ifdef HAVE_PUBRING_GPG + .incbin "certs/pubring.gpg" +#endif +__pgp_key_list_end: + + .align 8 + .globl pgp_public_keys_size +pgp_public_keys_size: +#ifdef CONFIG_64BIT + .quad __pgp_key_list_end - __pgp_key_list_start +#else + .long __pgp_key_list_end - __pgp_key_list_start +#endif diff --git a/certs/system_keyring.c b/certs/system_keyring.c index 26a11b1dcd59..1612fb97a652 100644 --- a/certs/system_keyring.c +++ b/certs/system_keyring.c @@ -167,6 +167,27 @@ static __init int load_system_certificate_list(void) } late_initcall(load_system_certificate_list); +#ifdef CONFIG_PGP_PRELOAD_PUBLIC_KEYS +extern __initconst const u8 pgp_public_keys[]; +extern __initconst const unsigned long pgp_public_keys_size; + +/* + * Load a list of PGP keys. + */ +static __init int load_pgp_public_keyring(void) +{ + pr_notice("Load PGP public keys\n"); + + if (preload_pgp_keys(pgp_public_keys, + pgp_public_keys_size, + builtin_trusted_keys) < 0) + pr_err("Can't load PGP public keys\n"); + + return 0; +} +late_initcall(load_pgp_public_keyring); +#endif /* CONFIG_PGP_PRELOAD_PUBLIC_KEYS */ + #ifdef CONFIG_SYSTEM_DATA_VERIFICATION /**