Re: [PATCH 3/4] certs: Add ability to preload revocation certs
On Thu, Feb 25, 2021 at 08:58:55PM +, David Howells wrote:
> From: Eric Snowberg
>
> Add a new Kconfig option called SYSTEM_REVOCATION_KEYS. 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.
>
> [DH: Changed this to make the new Kconfig option depend on the option to
> enable the facility.]
>
> Signed-off-by: Eric Snowberg
> Acked-by: Jarkko Sakkinen
> Signed-off-by: David Howells
> Link:
> https://lore.kernel.org/r/20200930201508.35113-3-eric.snowb...@oracle.com/
> Link:
> https://lore.kernel.org/r/20210122181054.32635-4-eric.snowb...@oracle.com/ #
> v5
> ---
>
> 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 76e469b56a77..ab88d2a7f3c7 100644
> --- a/certs/Kconfig
> +++ b/certs/Kconfig
> @@ -92,4 +92,12 @@ config SYSTEM_REVOCATION_LIST
> blacklist keyring and implements a hook whereby a PKCS#7 message can
> be checked to see if it matches such a certificate.
>
> +config SYSTEM_REVOCATION_KEYS
> + string "X.509 certificates to be preloaded into the system blacklist
> keyring"
> + depends on SYSTEM_REVOCATION_LIST
> + 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 2b8644123d5f..723b19c96256 100644
> --- a/certs/blacklist.c
> +++ b/certs/blacklist.c
> @@ -17,9 +17,13 @@
> #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.
> @@ -220,3 +224,16 @@ 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
[PATCH 3/4] certs: Add ability to preload revocation certs
From: Eric Snowberg
Add a new Kconfig option called SYSTEM_REVOCATION_KEYS. 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.
[DH: Changed this to make the new Kconfig option depend on the option to
enable the facility.]
Signed-off-by: Eric Snowberg
Acked-by: Jarkko Sakkinen
Signed-off-by: David Howells
Link: https://lore.kernel.org/r/20200930201508.35113-3-eric.snowb...@oracle.com/
Link:
https://lore.kernel.org/r/20210122181054.32635-4-eric.snowb...@oracle.com/ # v5
---
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 76e469b56a77..ab88d2a7f3c7 100644
--- a/certs/Kconfig
+++ b/certs/Kconfig
@@ -92,4 +92,12 @@ config SYSTEM_REVOCATION_LIST
blacklist keyring and implements a hook whereby a PKCS#7 message can
be checked to see if it matches such a certificate.
+config SYSTEM_REVOCATION_KEYS
+ string "X.509 certificates to be preloaded into the system blacklist
keyring"
+ depends on SYSTEM_REVOCATION_LIST
+ 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 2b8644123d5f..723b19c96256 100644
--- a/certs/blacklist.c
+++ b/certs/blacklist.c
@@ -17,9 +17,13 @@
#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.
@@ -220,3 +224,16 @@ 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 ..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:
