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Message-ID: <161433311696.902181.3599366124784670368.stgit@warthog.procyon.org.uk>
Date: Fri, 26 Feb 2021 09:51:56 +0000
From: David Howells <dhowells@...hat.com>
To: Eric Snowberg <eric.snowberg@...cle.com>
Cc: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
dhowells@...hat.com, Jarkko Sakkinen <jarkko@...nel.org>,
Mickaël Salaün <mic@...ikod.net>,
keyrings@...r.kernel.org, linux-security-module@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/4] certs: Move load_system_certificate_list to a common
function
From: Eric Snowberg <eric.snowberg@...cle.com>
Move functionality within load_system_certificate_list to a common
function, so it can be reused in the future.
DH Changes:
- Added inclusion of common.h to common.c (Eric [1]).
Signed-off-by: Eric Snowberg <eric.snowberg@...cle.com>
Acked-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
Signed-off-by: David Howells <dhowells@...hat.com>
Link: https://lore.kernel.org/r/20200930201508.35113-2-eric.snowberg@oracle.com/
Link: https://lore.kernel.org/r/20210122181054.32635-3-eric.snowberg@oracle.com/ # v5
Link: https://lore.kernel.org/r/EDA280F9-F72D-4181-93C7-CDBE95976FF7@oracle.com/ [1]
Link: https://lore.kernel.org/r/161428672825.677100.7545516389752262918.stgit@warthog.procyon.org.uk/
---
certs/Makefile | 2 +-
certs/common.c | 57 ++++++++++++++++++++++++++++++++++++++++++++++++
certs/common.h | 9 ++++++++
certs/system_keyring.c | 49 +++--------------------------------------
4 files changed, 70 insertions(+), 47 deletions(-)
create mode 100644 certs/common.c
create mode 100644 certs/common.h
diff --git a/certs/Makefile b/certs/Makefile
index f4c25b67aad9..f4b90bad8690 100644
--- a/certs/Makefile
+++ b/certs/Makefile
@@ -3,7 +3,7 @@
# Makefile for the linux kernel signature checking certificates.
#
-obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o
+obj-$(CONFIG_SYSTEM_TRUSTED_KEYRING) += system_keyring.o system_certificates.o common.o
obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist.o
ifneq ($(CONFIG_SYSTEM_BLACKLIST_HASH_LIST),"")
obj-$(CONFIG_SYSTEM_BLACKLIST_KEYRING) += blacklist_hashes.o
diff --git a/certs/common.c b/certs/common.c
new file mode 100644
index 000000000000..16a220887a53
--- /dev/null
+++ b/certs/common.c
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <linux/kernel.h>
+#include <linux/key.h>
+#include "common.h"
+
+int load_certificate_list(const u8 cert_list[],
+ const unsigned long list_size,
+ const struct key *keyring)
+{
+ key_ref_t key;
+ const u8 *p, *end;
+ size_t plen;
+
+ p = cert_list;
+ end = p + list_size;
+ while (p < end) {
+ /* Each cert begins with an ASN.1 SEQUENCE tag and must be more
+ * than 256 bytes in size.
+ */
+ if (end - p < 4)
+ goto dodgy_cert;
+ if (p[0] != 0x30 &&
+ p[1] != 0x82)
+ goto dodgy_cert;
+ plen = (p[2] << 8) | p[3];
+ plen += 4;
+ if (plen > end - p)
+ goto dodgy_cert;
+
+ key = key_create_or_update(make_key_ref(keyring, 1),
+ "asymmetric",
+ NULL,
+ p,
+ plen,
+ ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
+ KEY_USR_VIEW | KEY_USR_READ),
+ KEY_ALLOC_NOT_IN_QUOTA |
+ KEY_ALLOC_BUILT_IN |
+ KEY_ALLOC_BYPASS_RESTRICTION);
+ if (IS_ERR(key)) {
+ pr_err("Problem loading in-kernel X.509 certificate (%ld)\n",
+ PTR_ERR(key));
+ } else {
+ pr_notice("Loaded X.509 cert '%s'\n",
+ key_ref_to_ptr(key)->description);
+ key_ref_put(key);
+ }
+ p += plen;
+ }
+
+ return 0;
+
+dodgy_cert:
+ pr_err("Problem parsing in-kernel X.509 certificate list\n");
+ return 0;
+}
diff --git a/certs/common.h b/certs/common.h
new file mode 100644
index 000000000000..abdb5795936b
--- /dev/null
+++ b/certs/common.h
@@ -0,0 +1,9 @@
+/* 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 ed98754d5795..0c9a4795e847 100644
--- a/certs/system_keyring.c
+++ b/certs/system_keyring.c
@@ -16,6 +16,7 @@
#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
@@ -137,54 +138,10 @@ device_initcall(system_trusted_keyring_init);
*/
static __init int load_system_certificate_list(void)
{
- key_ref_t key;
- const u8 *p, *end;
- size_t plen;
-
pr_notice("Loading compiled-in X.509 certificates\n");
- p = system_certificate_list;
- end = p + system_certificate_list_size;
- while (p < end) {
- /* Each cert begins with an ASN.1 SEQUENCE tag and must be more
- * than 256 bytes in size.
- */
- if (end - p < 4)
- goto dodgy_cert;
- if (p[0] != 0x30 &&
- p[1] != 0x82)
- goto dodgy_cert;
- plen = (p[2] << 8) | p[3];
- plen += 4;
- if (plen > end - p)
- goto dodgy_cert;
-
- key = key_create_or_update(make_key_ref(builtin_trusted_keys, 1),
- "asymmetric",
- NULL,
- p,
- plen,
- ((KEY_POS_ALL & ~KEY_POS_SETATTR) |
- KEY_USR_VIEW | KEY_USR_READ),
- KEY_ALLOC_NOT_IN_QUOTA |
- KEY_ALLOC_BUILT_IN |
- KEY_ALLOC_BYPASS_RESTRICTION);
- if (IS_ERR(key)) {
- pr_err("Problem loading in-kernel X.509 certificate (%ld)\n",
- PTR_ERR(key));
- } else {
- pr_notice("Loaded X.509 cert '%s'\n",
- key_ref_to_ptr(key)->description);
- key_ref_put(key);
- }
- p += plen;
- }
-
- return 0;
-
-dodgy_cert:
- pr_err("Problem parsing in-kernel X.509 certificate list\n");
- return 0;
+ return load_certificate_list(system_certificate_list, system_certificate_list_size,
+ builtin_trusted_keys);
}
late_initcall(load_system_certificate_list);
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