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Thu, 17 Oct 2024 15:56:03 +0000 Received: from PH7PR10MB7730.namprd10.prod.outlook.com ([fe80::7ac6:2653:966f:9411]) by PH7PR10MB7730.namprd10.prod.outlook.com ([fe80::7ac6:2653:966f:9411%5]) with mapi id 15.20.8048.017; Thu, 17 Oct 2024 15:56:03 +0000 From: Eric Snowberg To: linux-security-module@vger.kernel.org Cc: dhowells@redhat.com, dwmw2@infradead.org, herbert@gondor.apana.org.au, davem@davemloft.net, ardb@kernel.org, jarkko@kernel.org, paul@paul-moore.com, jmorris@namei.org, serge@hallyn.com, zohar@linux.ibm.com, roberto.sassu@huawei.com, dmitry.kasatkin@gmail.com, mic@digikod.net, casey@schaufler-ca.com, stefanb@linux.ibm.com, eric.snowberg@oracle.com, ebiggers@kernel.org, rdunlap@infradead.org, linux-kernel@vger.kernel.org, keyrings@vger.kernel.org, linux-crypto@vger.kernel.org, linux-efi@vger.kernel.org, linux-integrity@vger.kernel.org Subject: [RFC PATCH v3 06/13] clavis: Populate clavis keyring acl with kernel module signature Date: Thu, 17 Oct 2024 09:55:09 -0600 Message-ID: <20241017155516.2582369-7-eric.snowberg@oracle.com> X-Mailer: git-send-email 2.45.0 In-Reply-To: <20241017155516.2582369-1-eric.snowberg@oracle.com> References: <20241017155516.2582369-1-eric.snowberg@oracle.com> X-ClientProxiedBy: BN9PR03CA0340.namprd03.prod.outlook.com (2603:10b6:408:f6::15) To PH7PR10MB7730.namprd10.prod.outlook.com (2603:10b6:510:308::13) Precedence: bulk X-Mailing-List: linux-integrity@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH7PR10MB7730:EE_|LV8PR10MB7967:EE_ X-MS-Office365-Filtering-Correlation-Id: 1d5b3e12-26b2-427e-6f34-08dceec42fc3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|7416014|366016; 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Signed-off-by: Eric Snowberg --- certs/.gitignore | 1 + certs/Makefile | 20 ++++++++++++++++++++ certs/clavis_module_acl.c | 7 +++++++ security/clavis/clavis.h | 9 +++++++++ security/clavis/clavis_keyring.c | 27 +++++++++++++++++++++++++++ 5 files changed, 64 insertions(+) create mode 100644 certs/clavis_module_acl.c diff --git a/certs/.gitignore b/certs/.gitignore index cec5465f31c1..dc99ae5a2585 100644 --- a/certs/.gitignore +++ b/certs/.gitignore @@ -3,3 +3,4 @@ /extract-cert /x509_certificate_list /x509_revocation_list +/module_acl diff --git a/certs/Makefile b/certs/Makefile index f6fa4d8d75e0..f2555e5296f5 100644 --- a/certs/Makefile +++ b/certs/Makefile @@ -6,6 +6,7 @@ obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o blacklist_hashes.o obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o +obj-$(CONFIG_SECURITY_CLAVIS) += clavis_module_acl.o $(obj)/blacklist_hashes.o: $(obj)/blacklist_hash_list CFLAGS_blacklist_hashes.o := -I $(obj) @@ -75,6 +76,25 @@ $(obj)/signing_key.x509: $(filter-out $(PKCS11_URI),$(CONFIG_MODULE_SIG_KEY)) $( targets += signing_key.x509 +ifeq ($(CONFIG_MODULE_SIG_KEY),) +quiet_cmd_make_module_acl = GEN $@ + cmd_make_module_acl = \ + echo > $@ +else +quiet_cmd_make_module_acl = GEN $@ + cmd_make_module_acl = \ + openssl x509 -in $< -inform der -ext subjectKeyIdentifier -nocert | \ + tail -n +2 | cut -f2 -d '='| tr -d ':' | tr '[:upper:]' '[:lower:]' | \ + sed 's/^[ \t]*//; s/.*/"00:&",/' > $@ +endif + +$(obj)/module_acl: $(obj)/signing_key.x509 FORCE + $(call if_changed,make_module_acl) + +$(obj)/clavis_module_acl.o: $(obj)/module_acl + +targets += module_acl + $(obj)/revocation_certificates.o: $(obj)/x509_revocation_list $(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) $(obj)/extract-cert FORCE diff --git a/certs/clavis_module_acl.c b/certs/clavis_module_acl.c new file mode 100644 index 000000000000..fc2f694c48f9 --- /dev/null +++ b/certs/clavis_module_acl.c @@ -0,0 +1,7 @@ +// SPDX-License-Identifier: GPL-2.0 +#include + +const char __initconst *const clavis_module_acl[] = { +#include "module_acl" + NULL +}; diff --git a/security/clavis/clavis.h b/security/clavis/clavis.h index 7b55a6050440..92f77a1939ad 100644 --- a/security/clavis/clavis.h +++ b/security/clavis/clavis.h @@ -11,4 +11,13 @@ struct asymmetric_setup_kid { struct asymmetric_key_id id; unsigned char data[CLAVIS_BIN_KID_MAX]; }; + +#ifndef CONFIG_SYSTEM_TRUSTED_KEYRING +const char __initconst *const clavis_module_acl[] = { + NULL +}; +#else +extern const char __initconst *const clavis_module_acl[]; +#endif + #endif /* _SECURITY_CLAVIS_H_ */ diff --git a/security/clavis/clavis_keyring.c b/security/clavis/clavis_keyring.c index 00163e7f0fe9..2a18d0e77189 100644 --- a/security/clavis/clavis_keyring.c +++ b/security/clavis/clavis_keyring.c @@ -259,6 +259,31 @@ static struct key_restriction *clavis_restriction_alloc(key_restrict_link_func_t return restriction; } +static void clavis_add_acl(const char *const *skid_list, struct key *keyring) +{ + const char *const *acl; + key_ref_t key; + + for (acl = skid_list; *acl; acl++) { + key = key_create(make_key_ref(keyring, true), + "clavis_key_acl", + *acl, + NULL, + 0, + KEY_POS_SEARCH | KEY_POS_VIEW | KEY_USR_SEARCH | KEY_USR_VIEW, + KEY_ALLOC_NOT_IN_QUOTA | KEY_ALLOC_BUILT_IN | + KEY_ALLOC_BYPASS_RESTRICTION); + if (IS_ERR(key)) { + if (PTR_ERR(key) == -EEXIST) + pr_info("Duplicate clavis_key_acl %s\n", *acl); + else + pr_info("Problem with clavis_key_acl %s: %pe\n", *acl, key); + } else { + pr_info("Added clavis_key_acl %s\n", *acl); + } + } +} + static int __init clavis_keyring_init(void) { struct key_restriction *restriction; @@ -274,6 +299,8 @@ static int __init clavis_keyring_init(void) if (IS_ERR(clavis_keyring)) panic("Can't allocate clavis keyring\n"); + clavis_add_acl(clavis_module_acl, clavis_keyring); + return 0; }