[PATCH v12 0/4] integrity: support including firmware ".platform" keys at build time

[PATCH v12 0/4] integrity: support including firmware ".platform" keys at build time

[Nayna Jain]

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 the ".platform"
keyring, preventing the kernel from verifying the kexec kernel image
signature.

This patchset exports load_certificate_list() and defines a new function
load_builtin_platform_cert() to load compiled in certificates onto the
".platform" keyring.

Changelog:
v12:
* Replace Patch 3/4 with reverting of the commit as suggested by
Masahiro Yamada.

v11:
* Added a new patch to conditionally build extract-cert if
PLATFORM_KEYRING is enabled.

v10:
* Fixed the externs warning for Patch 3.

v9:
* Rebased on Jarkko's repo - 
git://git.kernel.org/pub/scm/linux/kernel/git/jarkko/linux-tpmdd.git

v8:
* Includes Jarkko's feedback on patch description and removed Reported-by
for Patch 1.

v7:
* Incldues Jarkko's feedback on patch description for Patch 1 and 3.

v6:
* Includes Jarkko's feedback:
 * Split Patch 2 into two.
 * Update Patch description.

v5:
* Renamed load_builtin_platform_cert() to load_platform_certificate_list()
and config INTEGRITY_PLATFORM_BUILTIN_KEYS to INTEGRITY_PLATFORM_KEYS, as
suggested by Mimi Zohar.

v4:
* Split into two patches as per Mimi Zohar and Dimitri John Ledkov
recommendation.

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.

Nayna Jain (4):
  certs: export load_certificate_list() to be used outside certs/
  integrity: make integrity_keyring_from_id() non-static
  Revert "certs: move scripts/extract-cert to certs/"
  integrity: support including firmware ".platform" keys at build time

 MAINTAINERS                                   |  1 +
 certs/.gitignore                              |  1 -
 certs/Makefile                                | 18 ++++++---------
 certs/blacklist.c                             |  1 -
 certs/common.c                                |  2 +-
 certs/common.h                                |  9 --------
 certs/system_keyring.c                        |  1 -
 include/keys/system_keyring.h                 |  6 +++++
 scripts/.gitignore                            |  1 +
 scripts/Makefile                              | 12 ++++++++--
 {certs => scripts}/extract-cert.c             |  2 +-
 scripts/remove-stale-files                    |  2 --
 security/integrity/Kconfig                    | 10 ++++++++
 security/integrity/Makefile                   | 15 +++++++++++-
 security/integrity/digsig.c                   |  2 +-
 security/integrity/integrity.h                |  9 ++++++++
 .../integrity/platform_certs/platform_cert.S  | 23 +++++++++++++++++++
 .../platform_certs/platform_keyring.c         | 23 +++++++++++++++++++
 18 files changed, 107 insertions(+), 31 deletions(-)
 delete mode 100644 certs/common.h
 rename {certs => scripts}/extract-cert.c (98%)
 create mode 100644 security/integrity/platform_certs/platform_cert.S


base-commit: fb5abce6b2bb5cb3d628aaa63fa821da8c4600f9
-- 
2.34.1

[PATCH v12 1/4] certs: export load_certificate_list() to be used outside certs/

[Nayna Jain]

load_certificate_list() parses certificates embedded in the kernel
image to load them onto the keyring.

Commit "2565ca7f5ec1 (certs: Move load_system_certificate_list to a common
function)" made load_certificate_list() a common function in the certs/
directory. Export load_certificate_list() outside certs/ to be used by
load_platform_certificate_list() for loading compiled in platform keys
onto the .platform keyring at boot time.

Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
---
 certs/Makefile                | 5 +++--
 certs/blacklist.c             | 1 -
 certs/common.c                | 2 +-
 certs/common.h                | 9 ---------
 certs/system_keyring.c        | 1 -
 include/keys/system_keyring.h | 6 ++++++
 6 files changed, 10 insertions(+), 14 deletions(-)
 delete mode 100644 certs/common.h

diff --git a/certs/Makefile b/certs/Makefile
index 3ea7fe60823f..b92b6ff339d5 100644
--- a/certs/Makefile
+++ b/certs/Makefile
@@ -3,8 +3,9 @@
 # Makefile for the linux kernel signature checking certificates.
 #
 
-obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o common.o
-obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o common.o
+obj-$(CONFIG_KEYS) += common.o
+obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o
+obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o
 obj-$(CONFIG_SYSTEM_REVOCATION_LIST) += revocation_certificates.o
 ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),)
 obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.o
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 05b66ce9d1c9..2ae1b2e34375 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 2419a735420f..35babdc45689 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,
-- 
2.34.1

[PATCH v12 2/4] integrity: make integrity_keyring_from_id() non-static

[Nayna Jain]

Make integrity_keyring_from_id() non-static so that it is accessible
by other files in security/integrity.

Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
---
 security/integrity/digsig.c    | 2 +-
 security/integrity/integrity.h | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/security/integrity/digsig.c b/security/integrity/digsig.c
index c8c8a4a4e7a0..9c3165c07935 100644
--- a/security/integrity/digsig.c
+++ b/security/integrity/digsig.c
@@ -39,7 +39,7 @@ 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 2e214c761158..76e9a9515f99 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -168,6 +168,7 @@ 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,
@@ -195,6 +196,11 @@ 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
-- 
2.34.1

[PATCH v12 3/4] Revert "certs: move scripts/extract-cert to certs/"

[Nayna Jain]

This reverts commit 340a02535ee785c64c62a9c45706597a0139e972.

extract-cert is used outside certs/ by INTEGRITY_PLATFORM_KEYRING.

Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
---
 MAINTAINERS                       |  1 +
 certs/.gitignore                  |  1 -
 certs/Makefile                    | 13 ++++---------
 scripts/.gitignore                |  1 +
 scripts/Makefile                  | 11 +++++++++--
 {certs => scripts}/extract-cert.c |  2 +-
 scripts/remove-stale-files        |  2 --
 7 files changed, 16 insertions(+), 15 deletions(-)
 rename {certs => scripts}/extract-cert.c (98%)

diff --git a/MAINTAINERS b/MAINTAINERS
index 05fd080b82f3..cf4cd22ca3a0 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4471,6 +4471,7 @@ L:	keyrings@vger.kernel.org
 S:	Maintained
 F:	Documentation/admin-guide/module-signing.rst
 F:	certs/
+F:	scripts/extract-cert.c
 F:	scripts/sign-file.c
 
 CFAG12864B LCD DRIVER
diff --git a/certs/.gitignore b/certs/.gitignore
index 9e42fe3e02f5..8c3763f80be3 100644
--- a/certs/.gitignore
+++ b/certs/.gitignore
@@ -1,4 +1,3 @@
 # SPDX-License-Identifier: GPL-2.0-only
-/extract-cert
 /x509_certificate_list
 /x509_revocation_list
diff --git a/certs/Makefile b/certs/Makefile
index b92b6ff339d5..a4a6f6a78904 100644
--- a/certs/Makefile
+++ b/certs/Makefile
@@ -14,11 +14,11 @@ obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_nohashes.o
 endif
 
 quiet_cmd_extract_certs  = CERT    $@
-      cmd_extract_certs  = $(obj)/extract-cert $(2) $@
+      cmd_extract_certs  = scripts/extract-cert $(2) $@
 
 $(obj)/system_certificates.o: $(obj)/x509_certificate_list
 
-$(obj)/x509_certificate_list: $(CONFIG_SYSTEM_TRUSTED_KEYS) $(obj)/extract-cert FORCE
+$(obj)/x509_certificate_list: $(CONFIG_SYSTEM_TRUSTED_KEYS) scripts/extract-cert FORCE
 	$(call if_changed,extract_certs,$(if $(CONFIG_SYSTEM_TRUSTED_KEYS),$<,""))
 
 targets += x509_certificate_list
@@ -75,7 +75,7 @@ endif
 
 $(obj)/system_certificates.o: $(obj)/signing_key.x509
 
-$(obj)/signing_key.x509: $(X509_DEP) $(obj)/extract-cert FORCE
+$(obj)/signing_key.x509: $(X509_DEP) scripts/extract-cert FORCE
 	$(call if_changed,extract_certs,$(if $(CONFIG_MODULE_SIG_KEY),$(if $(X509_DEP),$<,$(CONFIG_MODULE_SIG_KEY)),""))
 endif # CONFIG_MODULE_SIG
 
@@ -83,12 +83,7 @@ targets += signing_key.x509
 
 $(obj)/revocation_certificates.o: $(obj)/x509_revocation_list
 
-$(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) $(obj)/extract-cert FORCE
+$(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) scripts/extract-cert FORCE
 	$(call if_changed,extract_certs,$(if $(CONFIG_SYSTEM_REVOCATION_KEYS),$<,""))
 
 targets += x509_revocation_list
-
-hostprogs := extract-cert
-
-HOSTCFLAGS_extract-cert.o = $(shell pkg-config --cflags libcrypto 2> /dev/null)
-HOSTLDLIBS_extract-cert = $(shell pkg-config --libs libcrypto 2> /dev/null || echo -lcrypto)
diff --git a/scripts/.gitignore b/scripts/.gitignore
index eed308bef604..e83c620ef52c 100644
--- a/scripts/.gitignore
+++ b/scripts/.gitignore
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 /asn1_compiler
 /bin2c
+/extract-cert
 /insert-sys-cert
 /kallsyms
 /module.lds
diff --git a/scripts/Makefile b/scripts/Makefile
index ce5aa9030b74..cedc1f0e21d8 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -3,19 +3,26 @@
 # scripts contains sources for various helper programs used throughout
 # the kernel for the build process.
 
+CRYPTO_LIBS = $(shell pkg-config --libs libcrypto 2> /dev/null || echo -lcrypto)
+CRYPTO_CFLAGS = $(shell pkg-config --cflags libcrypto 2> /dev/null)
+
 hostprogs-always-$(CONFIG_BUILD_BIN2C)			+= bin2c
 hostprogs-always-$(CONFIG_KALLSYMS)			+= kallsyms
 hostprogs-always-$(BUILD_C_RECORDMCOUNT)		+= recordmcount
 hostprogs-always-$(CONFIG_BUILDTIME_TABLE_SORT)		+= sorttable
 hostprogs-always-$(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_REVOCATION_LIST)	+= extract-cert
 
 HOSTCFLAGS_sorttable.o = -I$(srctree)/tools/include
 HOSTLDLIBS_sorttable = -lpthread
 HOSTCFLAGS_asn1_compiler.o = -I$(srctree)/include
-HOSTCFLAGS_sign-file.o = $(shell pkg-config --cflags libcrypto 2> /dev/null)
-HOSTLDLIBS_sign-file = $(shell pkg-config --libs libcrypto 2> /dev/null || echo -lcrypto)
+HOSTCFLAGS_sign-file.o = $(CRYPTO_CFLAGS)
+HOSTLDLIBS_sign-file = $(CRYPTO_LIBS)
+HOSTCFLAGS_extract-cert.o = $(CRYPTO_CFLAGS)
+HOSTLDLIBS_extract-cert = $(CRYPTO_LIBS)
 
 ifdef CONFIG_UNWINDER_ORC
 ifeq ($(ARCH),x86_64)
diff --git a/certs/extract-cert.c b/scripts/extract-cert.c
similarity index 98%
rename from certs/extract-cert.c
rename to scripts/extract-cert.c
index f7ef7862f207..3bc48c726c41 100644
--- a/certs/extract-cert.c
+++ b/scripts/extract-cert.c
@@ -29,7 +29,7 @@ static __attribute__((noreturn))
 void format(void)
 {
 	fprintf(stderr,
-		"Usage: extract-cert <source> <dest>\n");
+		"Usage: scripts/extract-cert <source> <dest>\n");
 	exit(2);
 }
 
diff --git a/scripts/remove-stale-files b/scripts/remove-stale-files
index 7adab4618035..80430b8fb617 100755
--- a/scripts/remove-stale-files
+++ b/scripts/remove-stale-files
@@ -39,5 +39,3 @@ if [ -n "${building_out_of_srctree}" ]; then
 		rm -f arch/parisc/boot/compressed/${f}
 	done
 fi
-
-rm -f scripts/extract-cert
-- 
2.34.1

[PATCH v12 4/4] integrity: support including firmware ".platform" keys at build time

[Nayna Jain]

Allow firmware keys to be embedded in the Linux kernel and loaded onto
the ".platform" keyring on boot.

The firmware keys can be specified in a file as a list of PEM encoded
certificates using new config INTEGRITY_PLATFORM_KEYS. The certificates
are embedded in the image by converting the PEM-formatted certificates
into DER(binary) and generating
security/integrity/platform_certs/platform_certificate_list file at
build time. On boot, the embedded certs from the image are loaded onto
the ".platform" keyring at late_initcall(), ensuring the platform keyring
exists before loading the keys.

Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
---
 scripts/Makefile                              |  1 +
 security/integrity/Kconfig                    | 10 ++++++++
 security/integrity/Makefile                   | 15 +++++++++++-
 security/integrity/integrity.h                |  3 +++
 .../integrity/platform_certs/platform_cert.S  | 23 +++++++++++++++++++
 .../platform_certs/platform_keyring.c         | 23 +++++++++++++++++++
 6 files changed, 74 insertions(+), 1 deletion(-)
 create mode 100644 security/integrity/platform_certs/platform_cert.S

diff --git a/scripts/Makefile b/scripts/Makefile
index cedc1f0e21d8..c569594af4a6 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -15,6 +15,7 @@ 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_REVOCATION_LIST)	+= extract-cert
+hostprogs-always-$(CONFIG_INTEGRITY_PLATFORM_KEYRING)	+= extract-cert
 
 HOSTCFLAGS_sorttable.o = -I$(srctree)/tools/include
 HOSTLDLIBS_sorttable = -lpthread
diff --git a/security/integrity/Kconfig b/security/integrity/Kconfig
index 599429f99f99..77b2c22c0e1b 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_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 INTEGRITY_MACHINE_KEYRING
 	bool "Provide a keyring to which Machine Owner Keys may be added"
 	depends on SECONDARY_TRUSTED_KEYRING
diff --git a/security/integrity/Makefile b/security/integrity/Makefile
index d0ffe37dc1d6..4154bf4996a9 100644
--- a/security/integrity/Makefile
+++ b/security/integrity/Makefile
@@ -3,13 +3,17 @@
 # Makefile for caching inode integrity data (iint)
 #
 
+quiet_cmd_extract_certs  = CERT  $@
+      cmd_extract_certs  = scripts/extract-cert $(2) $@
+
 obj-$(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_INTEGRITY_MACHINE_KEYRING) += platform_certs/machine_keyring.o
 integrity-$(CONFIG_LOAD_UEFI_KEYS) += platform_certs/efi_parser.o \
 				      platform_certs/load_uefi.o \
@@ -20,3 +24,12 @@ integrity-$(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: $(CONFIG_INTEGRITY_PLATFORM_KEYS) scripts/extract-cert FORCE
+	$(call if_changed,extract_certs,$(if $(CONFIG_INTEGRITY_PLATFORM_KEYS),$<,""))
+
+clean-files := platform_certs/platform_certificate_list
diff --git a/security/integrity/integrity.h b/security/integrity/integrity.h
index 76e9a9515f99..219da29fecf7 100644
--- a/security/integrity/integrity.h
+++ b/security/integrity/integrity.h
@@ -282,6 +282,9 @@ integrity_audit_log_start(struct audit_context *ctx, gfp_t gfp_mask, int type)
 #endif
 
 #ifdef CONFIG_INTEGRITY_PLATFORM_KEYRING
+extern __initconst const u8 platform_certificate_list[];
+extern __initconst const unsigned long platform_certificate_list_size;
+
 void __init add_to_platform_keyring(const char *source, const void *data,
 				    size_t len);
 #else
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..c2368912fd1b 100644
--- a/security/integrity/platform_certs/platform_keyring.c
+++ b/security/integrity/platform_certs/platform_keyring.c
@@ -12,6 +12,7 @@
 #include <linux/cred.h>
 #include <linux/err.h>
 #include <linux/slab.h>
+#include <keys/system_keyring.h>
 #include "../integrity.h"
 
 /**
@@ -37,6 +38,28 @@ 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_platform_certificate_list(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_platform_certificate_list);
+
 /*
  * Create the trusted keyrings.
  */
-- 
2.34.1

Re: [PATCH v12 0/4] integrity: support including firmware ".platform" keys at build time

[Nageswara Sastry]

On 12/03/22 2:33 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 the ".platform"
> keyring, preventing the kernel from verifying the kexec kernel image
> signature.
> 
> This patchset exports load_certificate_list() and defines a new function
> load_builtin_platform_cert() to load compiled in certificates onto the
> ".platform" keyring.
> 
> Changelog:
> v12:
> * Replace Patch 3/4 with reverting of the commit as suggested by
> Masahiro Yamada.
> 

Tested the following four patches ov v12 with and with out setting 
CONFIG_INTEGRITY_PLATFORM_KEYS

Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com>


1. With CONFIG_INTEGRITY_PLATFORM_KEYS set to a key

# grep pem .config
CONFIG_INTEGRITY_PLATFORM_KEYS="certs/kernel.pem"
CONFIG_MODULE_SIG_KEY="certs/signing_key.pem"
CONFIG_SYSTEM_TRUSTED_KEYS="certs/rhel.pem"

# grep 
"CONFIG_INTEGRITY_PLATFORM_KEYS\|INTEGRITY_PLATFORM_KEYRING\|SYSTEM_REVOCATION_LIST" 
.config
CONFIG_INTEGRITY_PLATFORM_KEYRING=y
CONFIG_INTEGRITY_PLATFORM_KEYS="certs/kernel.pem"
# CONFIG_SYSTEM_REVOCATION_LIST is not set

# cat /proc/keys | grep platform
0a7a11a9 I------     1 perm 1f0b0000     0     0 keyring   .platform: 1

# keyctl show %keyring:.platform
Keyring
  175772073 ---lswrv      0     0  keyring: .platform
  519271447 ---lswrv      0     0   \_ asymmetric: IBM Corporation: 
Guest Secure Boot Imprint Kernel Signing Key: 
a0cf9069c30875320cb10a77325d4fa7012f8d12


2. With out CONFIG_INTEGRITY_PLATFORM_KEYS set, leaving empty

# grep pem .config
CONFIG_MODULE_SIG_KEY="certs/signing_key.pem"
CONFIG_SYSTEM_TRUSTED_KEYS="certs/rhel.pem"

# grep 
"CONFIG_INTEGRITY_PLATFORM_KEYS\|INTEGRITY_PLATFORM_KEYRING\|SYSTEM_REVOCATION_LIST" 
.config
CONFIG_INTEGRITY_PLATFORM_KEYRING=y
CONFIG_INTEGRITY_PLATFORM_KEYS=""
# CONFIG_SYSTEM_REVOCATION_LIST is not set

# cat /proc/keys | grep platform
39c749b9 I------     1 perm 1f0b0000     0     0 keyring   .platform: empty

# keyctl show %keyring:.platform
Keyring
  969361849 ---lswrv      0     0  keyring: .platform



> 
> base-commit: fb5abce6b2bb5cb3d628aaa63fa821da8c4600f9

-- 
Thanks and Regards
R.Nageswara Sastry

Re: [PATCH v12 3/4] Revert "certs: move scripts/extract-cert to certs/"

[Nayna]

On 3/11/22 16:03, Nayna Jain wrote:
> This reverts commit 340a02535ee785c64c62a9c45706597a0139e972.
>
> extract-cert is used outside certs/ by INTEGRITY_PLATFORM_KEYRING.

Hi Masahiro,

Could you review and Ack this patch ?

Thanks & Regards,

     - Nayna


>
> Signed-off-by: Nayna Jain <nayna@linux.ibm.com>
> ---
>   MAINTAINERS                       |  1 +
>   certs/.gitignore                  |  1 -
>   certs/Makefile                    | 13 ++++---------
>   scripts/.gitignore                |  1 +
>   scripts/Makefile                  | 11 +++++++++--
>   {certs => scripts}/extract-cert.c |  2 +-
>   scripts/remove-stale-files        |  2 --
>   7 files changed, 16 insertions(+), 15 deletions(-)
>   rename {certs => scripts}/extract-cert.c (98%)
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 05fd080b82f3..cf4cd22ca3a0 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4471,6 +4471,7 @@ L:	keyrings@vger.kernel.org
>   S:	Maintained
>   F:	Documentation/admin-guide/module-signing.rst
>   F:	certs/
> +F:	scripts/extract-cert.c
>   F:	scripts/sign-file.c
>   
>   CFAG12864B LCD DRIVER
> diff --git a/certs/.gitignore b/certs/.gitignore
> index 9e42fe3e02f5..8c3763f80be3 100644
> --- a/certs/.gitignore
> +++ b/certs/.gitignore
> @@ -1,4 +1,3 @@
>   # SPDX-License-Identifier: GPL-2.0-only
> -/extract-cert
>   /x509_certificate_list
>   /x509_revocation_list
> diff --git a/certs/Makefile b/certs/Makefile
> index b92b6ff339d5..a4a6f6a78904 100644
> --- a/certs/Makefile
> +++ b/certs/Makefile
> @@ -14,11 +14,11 @@ obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_nohashes.o
>   endif
>   
>   quiet_cmd_extract_certs  = CERT    $@
> -      cmd_extract_certs  = $(obj)/extract-cert $(2) $@
> +      cmd_extract_certs  = scripts/extract-cert $(2) $@
>   
>   $(obj)/system_certificates.o: $(obj)/x509_certificate_list
>   
> -$(obj)/x509_certificate_list: $(CONFIG_SYSTEM_TRUSTED_KEYS) $(obj)/extract-cert FORCE
> +$(obj)/x509_certificate_list: $(CONFIG_SYSTEM_TRUSTED_KEYS) scripts/extract-cert FORCE
>   	$(call if_changed,extract_certs,$(if $(CONFIG_SYSTEM_TRUSTED_KEYS),$<,""))
>   
>   targets += x509_certificate_list
> @@ -75,7 +75,7 @@ endif
>   
>   $(obj)/system_certificates.o: $(obj)/signing_key.x509
>   
> -$(obj)/signing_key.x509: $(X509_DEP) $(obj)/extract-cert FORCE
> +$(obj)/signing_key.x509: $(X509_DEP) scripts/extract-cert FORCE
>   	$(call if_changed,extract_certs,$(if $(CONFIG_MODULE_SIG_KEY),$(if $(X509_DEP),$<,$(CONFIG_MODULE_SIG_KEY)),""))
>   endif # CONFIG_MODULE_SIG
>   
> @@ -83,12 +83,7 @@ targets += signing_key.x509
>   
>   $(obj)/revocation_certificates.o: $(obj)/x509_revocation_list
>   
> -$(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) $(obj)/extract-cert FORCE
> +$(obj)/x509_revocation_list: $(CONFIG_SYSTEM_REVOCATION_KEYS) scripts/extract-cert FORCE
>   	$(call if_changed,extract_certs,$(if $(CONFIG_SYSTEM_REVOCATION_KEYS),$<,""))
>   
>   targets += x509_revocation_list
> -
> -hostprogs := extract-cert
> -
> -HOSTCFLAGS_extract-cert.o = $(shell pkg-config --cflags libcrypto 2> /dev/null)
> -HOSTLDLIBS_extract-cert = $(shell pkg-config --libs libcrypto 2> /dev/null || echo -lcrypto)
> diff --git a/scripts/.gitignore b/scripts/.gitignore
> index eed308bef604..e83c620ef52c 100644
> --- a/scripts/.gitignore
> +++ b/scripts/.gitignore
> @@ -1,6 +1,7 @@
>   # SPDX-License-Identifier: GPL-2.0-only
>   /asn1_compiler
>   /bin2c
> +/extract-cert
>   /insert-sys-cert
>   /kallsyms
>   /module.lds
> diff --git a/scripts/Makefile b/scripts/Makefile
> index ce5aa9030b74..cedc1f0e21d8 100644
> --- a/scripts/Makefile
> +++ b/scripts/Makefile
> @@ -3,19 +3,26 @@
>   # scripts contains sources for various helper programs used throughout
>   # the kernel for the build process.
>   
> +CRYPTO_LIBS = $(shell pkg-config --libs libcrypto 2> /dev/null || echo -lcrypto)
> +CRYPTO_CFLAGS = $(shell pkg-config --cflags libcrypto 2> /dev/null)
> +
>   hostprogs-always-$(CONFIG_BUILD_BIN2C)			+= bin2c
>   hostprogs-always-$(CONFIG_KALLSYMS)			+= kallsyms
>   hostprogs-always-$(BUILD_C_RECORDMCOUNT)		+= recordmcount
>   hostprogs-always-$(CONFIG_BUILDTIME_TABLE_SORT)		+= sorttable
>   hostprogs-always-$(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_REVOCATION_LIST)	+= extract-cert
>   
>   HOSTCFLAGS_sorttable.o = -I$(srctree)/tools/include
>   HOSTLDLIBS_sorttable = -lpthread
>   HOSTCFLAGS_asn1_compiler.o = -I$(srctree)/include
> -HOSTCFLAGS_sign-file.o = $(shell pkg-config --cflags libcrypto 2> /dev/null)
> -HOSTLDLIBS_sign-file = $(shell pkg-config --libs libcrypto 2> /dev/null || echo -lcrypto)
> +HOSTCFLAGS_sign-file.o = $(CRYPTO_CFLAGS)
> +HOSTLDLIBS_sign-file = $(CRYPTO_LIBS)
> +HOSTCFLAGS_extract-cert.o = $(CRYPTO_CFLAGS)
> +HOSTLDLIBS_extract-cert = $(CRYPTO_LIBS)
>   
>   ifdef CONFIG_UNWINDER_ORC
>   ifeq ($(ARCH),x86_64)
> diff --git a/certs/extract-cert.c b/scripts/extract-cert.c
> similarity index 98%
> rename from certs/extract-cert.c
> rename to scripts/extract-cert.c
> index f7ef7862f207..3bc48c726c41 100644
> --- a/certs/extract-cert.c
> +++ b/scripts/extract-cert.c
> @@ -29,7 +29,7 @@ static __attribute__((noreturn))
>   void format(void)
>   {
>   	fprintf(stderr,
> -		"Usage: extract-cert <source> <dest>\n");
> +		"Usage: scripts/extract-cert <source> <dest>\n");
>   	exit(2);
>   }
>   
> diff --git a/scripts/remove-stale-files b/scripts/remove-stale-files
> index 7adab4618035..80430b8fb617 100755
> --- a/scripts/remove-stale-files
> +++ b/scripts/remove-stale-files
> @@ -39,5 +39,3 @@ if [ -n "${building_out_of_srctree}" ]; then
>   		rm -f arch/parisc/boot/compressed/${f}
>   	done
>   fi
> -
> -rm -f scripts/extract-cert

Re: [PATCH v12 1/4] certs: export load_certificate_list() to be used outside certs/

[Jarkko Sakkinen]

On Fri, Mar 11, 2022 at 04:03:41PM -0500, Nayna Jain wrote:
> load_certificate_list() parses certificates embedded in the kernel
> image to load them onto the keyring.
> 
> Commit "2565ca7f5ec1 (certs: Move load_system_certificate_list to a common
> function)" made load_certificate_list() a common function in the certs/
> directory. Export load_certificate_list() outside certs/ to be used by
> load_platform_certificate_list() for loading compiled in platform keys
> onto the .platform keyring at boot time.
> 
> Reviewed-by: Mimi Zohar <zohar@linux.ibm.com>
> Signed-off-by: Nayna Jain <nayna@linux.ibm.com>

Why all tested-by tags are still missing?

BR, Jarkko