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Date: Tue, 19 Oct 2021 14:25:07 -0400 From: Nayna <nayna@...ux.vnet.ibm.com> To: linux-integrity@...r.kernel.org, keyrings@...r.kernel.org Cc: dhowells@...hat.com, zohar@...ux.ibm.com, jarkko@...nel.org, seth.forshee@...onical.com, linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org, kernel test robot <lkp@...el.com>, Nayna Jain <nayna@...ux.ibm.com> Subject: Re: [PATCH v3] integrity: support including firmware ".platform" keys at build time Gentle reminder for v3. Is this version good now for acceptance ? Thanks & Regards, - Nayna On 10/4/21 10:52 AM, Nayna Jain wrote: > Some firmware support secure boot 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 these environments, a new function load_builtin_platform_cert() is > defined to load compiled in certificates onto the ".platform" keyring. > > load_certificate_list() is currently used for parsing compiled in > certificates to be loaded onto the .builtin or .blacklist keyrings. > Export load_certificate_list() allowing it to be used for parsing compiled > in ".platform" keyring certificates as well. > > Reported-by: kernel test robot <lkp@...el.com>(auto build test ERROR) > Signed-off-by: Nayna Jain <nayna@...ux.ibm.com> > --- > NOTE: I am wondering if we should split this patch into two: > (https://lore.kernel.org/linux-integrity/be4bd13d-659d-710d-08b9-1a34a65e5c5d@linux.vnet.ibm.com/). > I can do so if you also prefer the same. > > v3: > * Included Jarkko's feedback > ** updated patch description to include approach. > ** removed extern for function declaration in the .h file. > * Included load_certificate_list() within #ifdef CONFIG_KEYS condition. > > 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 | 6 +++++ > 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, 91 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 <linux/uidgid.h> > #include <keys/system_keyring.h> > #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 <linux/kernel.h> > #include <linux/key.h> > -#include "common.h" > +#include <keys/system_keyring.h> > > 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 <keys/asymmetric-type.h> > #include <keys/system_keyring.h> > #include <crypto/pkcs7.h> > -#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..d3f914d9a632 100644 > --- a/include/keys/system_keyring.h > +++ b/include/keys/system_keyring.h > @@ -10,6 +10,12 @@ > > #include <linux/key.h> > > +#ifdef CONFIG_KEYS > +int load_certificate_list(const u8 cert_list[], > + const unsigned long list_size, > + const struct key *keyring); > +#endif > + > #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 <linux/export.h> > +#include <linux/init.h> > + > + __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 <linux/cred.h> > #include <linux/err.h> > #include <linux/slab.h> > +#include <keys/system_keyring.h> > #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. > */
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