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Thu, 16 Sep 2021 12:58:13 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6ADB5A4065; Thu, 16 Sep 2021 12:58:13 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B4A52A405D; Thu, 16 Sep 2021 12:58:10 +0000 (GMT) Received: from li-4b5937cc-25c4-11b2-a85c-cea3a66903e4.ibm.com.com (unknown [9.163.30.115]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 16 Sep 2021 12:58:10 +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, seth.forshee@canonical.com, linux-security-module@vger.kernel.org, linux-kernel@vger.kernel.org, Nayna Jain , kernel test robot Subject: [PATCH v2] integrity: support including firmware ".platform" keys at build time Date: Thu, 16 Sep 2021 08:57:56 -0400 Message-Id: <20210916125756.89908-1-nayna@linux.ibm.com> X-Mailer: git-send-email 2.27.0 MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: b6O6liwob2zHYLyOdTJOMrdlUs0TRidq X-Proofpoint-ORIG-GUID: VWqfsWs6ggXAa8S6WoyCvgdeRjWBAr_B X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.182.1,Aquarius:18.0.687,Hydra:6.0.235,FMLib:17.0.607.475 definitions=2020-10-13_15,2020-10-13_02,2020-04-07_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 mlxscore=0 bulkscore=0 spamscore=0 clxscore=1015 mlxlogscore=999 adultscore=0 phishscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2109030001 definitions=main-2109160072 Precedence: bulk List-ID: X-Mailing-List: linux-integrity@vger.kernel.org Some firmware support secureboot by embedding static keys to verify the Linux kernel during boot. However, these firmware do not expose an interface for the kernel to load firmware keys onto ".platform" keyring. This would prevent kernel signature verification on kexec. For those environments, allow firmware keys to be compiled into the kernel and loaded onto the ".platform" keyring. Reported-by: kernel test robot Signed-off-by: Nayna Jain --- v2: * Fixed the error reported by kernel test robot * Updated patch description based on Jarkko's feedback. certs/Makefile | 3 ++- certs/blacklist.c | 1 - certs/common.c | 2 +- certs/common.h | 9 ------- certs/system_keyring.c | 1 - include/keys/system_keyring.h | 3 +++ security/integrity/Kconfig | 10 +++++++ security/integrity/Makefile | 17 +++++++++++- security/integrity/digsig.c | 2 +- security/integrity/integrity.h | 6 +++++ .../integrity/platform_certs/platform_cert.S | 23 ++++++++++++++++ .../platform_certs/platform_keyring.c | 26 +++++++++++++++++++ 12 files changed, 88 insertions(+), 15 deletions(-) delete mode 100644 certs/common.h create mode 100644 security/integrity/platform_certs/platform_cert.S diff --git a/certs/Makefile b/certs/Makefile index 279433783b10..64ee37f38b85 100644 --- a/certs/Makefile +++ b/certs/Makefile @@ -3,7 +3,8 @@ # Makefile for the linux kernel signature checking certificates. # -obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o common.o +obj-$(CONFIG_KEYS) += common.o +obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o common.o obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),"") diff --git a/certs/blacklist.c b/certs/blacklist.c index c9a435b15af4..b95e9b19c42f 100644 --- a/certs/blacklist.c +++ b/certs/blacklist.c @@ -17,7 +17,6 @@ #include #include #include "blacklist.h" -#include "common.h" static struct key *blacklist_keyring; diff --git a/certs/common.c b/certs/common.c index 16a220887a53..41f763415a00 100644 --- a/certs/common.c +++ b/certs/common.c @@ -2,7 +2,7 @@ #include #include -#include "common.h" +#include int load_certificate_list(const u8 cert_list[], const unsigned long list_size, diff --git a/certs/common.h b/certs/common.h deleted file mode 100644 index abdb5795936b..000000000000 --- a/certs/common.h +++ /dev/null @@ -1,9 +0,0 @@ -/* SPDX-License-Identifier: GPL-2.0-or-later */ - -#ifndef _CERT_COMMON_H -#define _CERT_COMMON_H - -int load_certificate_list(const u8 cert_list[], const unsigned long list_size, - const struct key *keyring); - -#endif diff --git a/certs/system_keyring.c b/certs/system_keyring.c index 692365dee2bd..d130d5a96e09 100644 --- a/certs/system_keyring.c +++ b/certs/system_keyring.c @@ -16,7 +16,6 @@ #include #include #include -#include "common.h" static struct key *builtin_trusted_keys; #ifdef CONFIG_SECONDARY_TRUSTED_KEYRING diff --git a/include/keys/system_keyring.h b/include/keys/system_keyring.h index 6acd3cf13a18..842d770b2a46 100644 --- a/include/keys/system_keyring.h +++ b/include/keys/system_keyring.h @@ -10,6 +10,9 @@ #include +extern int load_certificate_list(const u8 cert_list[], + const unsigned long list_size, + const struct key *keyring); #ifdef CONFIG_SYSTEM_TRUSTED_KEYRING extern int restrict_link_by_builtin_trusted(struct key *keyring, diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig index 71f0177e8716..b2009b792882 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_BUILTIN_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..a45f083589b8 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 $(call config_filename,INTEGRITY_PLATFORM_BUILTIN_KEYS)) + obj-$(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_BUILTIN_KEYS_FILENAME) FORCE + $(call if_changed,extract_certs,$(CONFIG_INTEGRITY_PLATFORM_BUILTIN_KEYS)) + +clean-files := platform_certs/platform_certificate_list diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c index 3b06a01bd0fd..0ea40ed8dfcb 100644 --- a/security/integrity/digsig.c +++ b/security/integrity/digsig.c @@ -38,7 +38,7 @@ static const char * const keyring_name[INTEGRITY_KEYRING_MAX] = { #define restrict_link_to_ima restrict_link_by_builtin_trusted #endif -static struct key *integrity_keyring_from_id(const unsigned int id) +struct key *integrity_keyring_from_id(const unsigned int id) { if (id >= INTEGRITY_KEYRING_MAX) return ERR_PTR(-EINVAL); diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h index 547425c20e11..feb84e1b1105 100644 --- a/security/integrity/integrity.h +++ b/security/integrity/integrity.h @@ -167,6 +167,7 @@ int __init integrity_init_keyring(const unsigned int id); int __init integrity_load_x509(const unsigned int id, const char *path); int __init integrity_load_cert(const unsigned int id, const char *source, const void *data, size_t len, key_perm_t perm); +struct key *integrity_keyring_from_id(const unsigned int id); #else static inline int integrity_digsig_verify(const unsigned int id, @@ -194,6 +195,11 @@ static inline int __init integrity_load_cert(const unsigned int id, { return 0; } + +static inline struct key *integrity_keyring_from_id(const unsigned int id) +{ + return ERR_PTR(-EOPNOTSUPP); +} #endif /* CONFIG_INTEGRITY_SIGNATURE */ #ifdef CONFIG_INTEGRITY_ASYMMETRIC_KEYS 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..17535050d08d 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_builtin_platform_cert(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_builtin_platform_cert); + /* * Create the trusted keyrings. */