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Fri, 22 Jan 2021 18:11:37 +0000 From: Eric Snowberg To: dhowells@redhat.com, dwmw2@infradead.org, jarkko@kernel.org, James.Bottomley@HansenPartnership.com Cc: masahiroy@kernel.org, michal.lkml@markovi.net, jmorris@namei.org, serge@hallyn.com, eric.snowberg@oracle.com, ardb@kernel.org, zohar@linux.ibm.com, lszubowi@redhat.com, javierm@redhat.com, keyrings@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kbuild@vger.kernel.org, linux-security-module@vger.kernel.org Subject: [PATCH v5 3/4] certs: Add ability to preload revocation certs Date: Fri, 22 Jan 2021 13:10:53 -0500 Message-Id: <20210122181054.32635-4-eric.snowberg@oracle.com> X-Mailer: git-send-email 2.18.4 In-Reply-To: <20210122181054.32635-1-eric.snowberg@oracle.com> References: <20210122181054.32635-1-eric.snowberg@oracle.com> Content-Type: text/plain X-Originating-IP: [138.3.200.2] X-ClientProxiedBy: CH2PR10CA0006.namprd10.prod.outlook.com (2603:10b6:610:4c::16) To DM6PR10MB3099.namprd10.prod.outlook.com (2603:10b6:5:1ad::18) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from localhost.us.oracle.com (138.3.200.2) by CH2PR10CA0006.namprd10.prod.outlook.com (2603:10b6:610:4c::16) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3784.11 via Frontend Transport; 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If set, this option should be the filename of a PEM-formated file containing X.509 certificates to be included in the default blacklist keyring. Signed-off-by: Eric Snowberg Acked-by: Jarkko Sakkinen --- certs/Kconfig | 8 ++++++++ certs/Makefile | 18 ++++++++++++++++-- certs/blacklist.c | 17 +++++++++++++++++ certs/revocation_certificates.S | 21 +++++++++++++++++++++ scripts/Makefile | 1 + 5 files changed, 63 insertions(+), 2 deletions(-) create mode 100644 certs/revocation_certificates.S diff --git a/certs/Kconfig b/certs/Kconfig index c94e93d8bccf..379a6e198459 100644 --- a/certs/Kconfig +++ b/certs/Kconfig @@ -83,4 +83,12 @@ config SYSTEM_BLACKLIST_HASH_LIST wrapper to incorporate the list into the kernel. Each should be a string of hex digits. +config SYSTEM_REVOCATION_KEYS + string "X.509 certificates to be preloaded into the system blacklist keyring" + depends on SYSTEM_BLACKLIST_KEYRING + help + If set, this option should be the filename of a PEM-formatted file + containing X.509 certificates to be included in the default blacklist + keyring. + endmenu diff --git a/certs/Makefile b/certs/Makefile index f4b90bad8690..e3f4926fd21e 100644 --- a/certs/Makefile +++ b/certs/Makefile @@ -4,7 +4,7 @@ # obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o common.o -obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o +obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o revocation_certificates.o common.o ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),"") obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.o else @@ -29,7 +29,7 @@ $(obj)/x509_certificate_list: scripts/extract-cert $(SYSTEM_TRUSTED_KEYS_SRCPREF $(call if_changed,extract_certs,$(SYSTEM_TRUSTED_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_TRUSTED_KEYS)) endif # CONFIG_SYSTEM_TRUSTED_KEYRING -clean-files := x509_certificate_list .x509.list +clean-files := x509_certificate_list .x509.list x509_revocation_list ifeq ($(CONFIG_MODULE_SIG),y) ############################################################################### @@ -104,3 +104,17 @@ targets += signing_key.x509 $(obj)/signing_key.x509: scripts/extract-cert $(X509_DEP) FORCE $(call if_changed,extract_certs,$(MODULE_SIG_KEY_SRCPREFIX)$(CONFIG_MODULE_SIG_KEY)) endif # CONFIG_MODULE_SIG + +ifeq ($(CONFIG_SYSTEM_BLACKLIST_KEYRING),y) + +$(eval $(call config_filename,SYSTEM_REVOCATION_KEYS)) + +$(obj)/revocation_certificates.o: $(obj)/x509_revocation_list + +quiet_cmd_extract_certs = EXTRACT_CERTS $(patsubst "%",%,$(2)) + cmd_extract_certs = scripts/extract-cert $(2) $@ + +targets += x509_revocation_list +$(obj)/x509_revocation_list: scripts/extract-cert $(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(SYSTEM_REVOCATION_KEYS_FILENAME) FORCE + $(call if_changed,extract_certs,$(SYSTEM_REVOCATION_KEYS_SRCPREFIX)$(CONFIG_SYSTEM_REVOCATION_KEYS)) +endif diff --git a/certs/blacklist.c b/certs/blacklist.c index a7f021878a4b..4e8a1068adb2 100644 --- a/certs/blacklist.c +++ b/certs/blacklist.c @@ -16,9 +16,13 @@ #include #include #include "blacklist.h" +#include "common.h" static struct key *blacklist_keyring; +extern __initconst const u8 revocation_certificate_list[]; +extern __initconst const unsigned long revocation_certificate_list_size; + /* * The description must be a type prefix, a colon and then an even number of * hex digits. The hash is kept in the description. @@ -209,3 +213,16 @@ static int __init blacklist_init(void) * Must be initialised before we try and load the keys into the keyring. */ device_initcall(blacklist_init); + +/* + * Load the compiled-in list of revocation X.509 certificates. + */ +static __init int load_revocation_certificate_list(void) +{ + if (revocation_certificate_list_size) + pr_notice("Loading compiled-in revocation X.509 certificates\n"); + + return load_certificate_list(revocation_certificate_list, revocation_certificate_list_size, + blacklist_keyring); +} +late_initcall(load_revocation_certificate_list); diff --git a/certs/revocation_certificates.S b/certs/revocation_certificates.S new file mode 100644 index 000000000000..f21aae8a8f0e --- /dev/null +++ b/certs/revocation_certificates.S @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#include +#include + + __INITRODATA + + .align 8 + .globl revocation_certificate_list +revocation_certificate_list: +__revocation_list_start: + .incbin "certs/x509_revocation_list" +__revocation_list_end: + + .align 8 + .globl revocation_certificate_list_size +revocation_certificate_list_size: +#ifdef CONFIG_64BIT + .quad __revocation_list_end - __revocation_list_start +#else + .long __revocation_list_end - __revocation_list_start +#endif diff --git a/scripts/Makefile b/scripts/Makefile index b5418ec587fb..983b785f13cb 100644 --- a/scripts/Makefile +++ b/scripts/Makefile @@ -11,6 +11,7 @@ hostprogs-always-$(CONFIG_ASN1) += asn1_compiler hostprogs-always-$(CONFIG_MODULE_SIG_FORMAT) += sign-file hostprogs-always-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += extract-cert hostprogs-always-$(CONFIG_SYSTEM_EXTRA_CERTIFICATE) += insert-sys-cert + hostprogs-always-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += extract-cert HOSTCFLAGS_sorttable.o = -I$(srctree)/tools/include HOSTCFLAGS_asn1_compiler.o = -I$(srctree)/include -- 2.18.4