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authorPetko Manolov <petkan@mip-labs.com>2015-12-02 18:47:55 +0300
committerMimi Zohar <zohar@linux.vnet.ibm.com>2015-12-15 18:01:43 +0300
commit41c89b64d7184a780f12f2cccdabe65cb2408893 (patch)
tree2f4b10b186e186bd70be5fea18c8423334ab831d /security/integrity
parent38d859f991f3a05b352a06f82af0baa1acf33e02 (diff)
downloadlinux-41c89b64d7184a780f12f2cccdabe65cb2408893.tar.xz
IMA: create machine owner and blacklist keyrings
This option creates IMA MOK and blacklist keyrings. IMA MOK is an intermediate keyring that sits between .system and .ima keyrings, effectively forming a simple CA hierarchy. To successfully import a key into .ima_mok it must be signed by a key which CA is in .system keyring. On turn any key that needs to go in .ima keyring must be signed by CA in either .system or .ima_mok keyrings. IMA MOK is empty at kernel boot. IMA blacklist keyring contains all revoked IMA keys. It is consulted before any other keyring. If the search is successful the requested operation is rejected and error is returned to the caller. Signed-off-by: Petko Manolov <petkan@mip-labs.com> Signed-off-by: Mimi Zohar <zohar@linux.vnet.ibm.com>
Diffstat (limited to 'security/integrity')
-rw-r--r--security/integrity/digsig_asymmetric.c14
-rw-r--r--security/integrity/ima/Kconfig18
-rw-r--r--security/integrity/ima/Makefile1
-rw-r--r--security/integrity/ima/ima_mok.c54
4 files changed, 87 insertions, 0 deletions
diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c
index 4fec1816a2b3..5ade2a7517a6 100644
--- a/security/integrity/digsig_asymmetric.c
+++ b/security/integrity/digsig_asymmetric.c
@@ -17,6 +17,7 @@
#include <linux/key-type.h>
#include <crypto/public_key.h>
#include <keys/asymmetric-type.h>
+#include <keys/system_keyring.h>
#include "integrity.h"
@@ -32,9 +33,22 @@ static struct key *request_asymmetric_key(struct key *keyring, uint32_t keyid)
pr_debug("key search: \"%s\"\n", name);
+ key = get_ima_blacklist_keyring();
+ if (key) {
+ key_ref_t kref;
+
+ kref = keyring_search(make_key_ref(key, 1),
+ &key_type_asymmetric, name);
+ if (!IS_ERR(kref)) {
+ pr_err("Key '%s' is in ima_blacklist_keyring\n", name);
+ return ERR_PTR(-EKEYREJECTED);
+ }
+ }
+
if (keyring) {
/* search in specific keyring */
key_ref_t kref;
+
kref = keyring_search(make_key_ref(keyring, 1),
&key_type_asymmetric, name);
if (IS_ERR(kref))
diff --git a/security/integrity/ima/Kconfig b/security/integrity/ima/Kconfig
index e74d66cbfe87..8d5e6e0e0937 100644
--- a/security/integrity/ima/Kconfig
+++ b/security/integrity/ima/Kconfig
@@ -145,6 +145,24 @@ config IMA_TRUSTED_KEYRING
This option is deprecated in favor of INTEGRITY_TRUSTED_KEYRING
+config IMA_MOK_KEYRING
+ bool "Create IMA machine owner keys (MOK) and blacklist keyrings"
+ depends on SYSTEM_TRUSTED_KEYRING
+ depends on IMA_TRUSTED_KEYRING
+ default n
+ help
+ This option creates IMA MOK and blacklist keyrings. IMA MOK is an
+ intermediate keyring that sits between .system and .ima keyrings,
+ effectively forming a simple CA hierarchy. To successfully import a
+ key into .ima_mok it must be signed by a key which CA is in .system
+ keyring. On turn any key that needs to go in .ima keyring must be
+ signed by CA in either .system or .ima_mok keyrings. IMA MOK is empty
+ at kernel boot.
+
+ IMA blacklist keyring contains all revoked IMA keys. It is consulted
+ before any other keyring. If the search is successful the requested
+ operation is rejected and error is returned to the caller.
+
config IMA_LOAD_X509
bool "Load X509 certificate onto the '.ima' trusted keyring"
depends on IMA_TRUSTED_KEYRING
diff --git a/security/integrity/ima/Makefile b/security/integrity/ima/Makefile
index d79263d2fdbf..a8539f9e060f 100644
--- a/security/integrity/ima/Makefile
+++ b/security/integrity/ima/Makefile
@@ -8,3 +8,4 @@ obj-$(CONFIG_IMA) += ima.o
ima-y := ima_fs.o ima_queue.o ima_init.o ima_main.o ima_crypto.o ima_api.o \
ima_policy.o ima_template.o ima_template_lib.o
ima-$(CONFIG_IMA_APPRAISE) += ima_appraise.o
+obj-$(CONFIG_IMA_MOK_KEYRING) += ima_mok.o
diff --git a/security/integrity/ima/ima_mok.c b/security/integrity/ima/ima_mok.c
new file mode 100644
index 000000000000..18e37f57f512
--- /dev/null
+++ b/security/integrity/ima/ima_mok.c
@@ -0,0 +1,54 @@
+/*
+ * Copyright (C) 2015 Juniper Networks, Inc.
+ *
+ * Author:
+ * Petko Manolov <petko.manolov@konsulko.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation, version 2 of the
+ * License.
+ *
+ */
+
+#include <linux/export.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/cred.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <keys/asymmetric-type.h>
+
+
+struct key *ima_mok_keyring;
+struct key *ima_blacklist_keyring;
+
+/*
+ * Allocate the IMA MOK and blacklist keyrings
+ */
+__init int ima_mok_init(void)
+{
+ pr_notice("Allocating IMA MOK and blacklist keyrings.\n");
+
+ ima_mok_keyring = keyring_alloc(".ima_mok",
+ KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
+ (KEY_POS_ALL & ~KEY_POS_SETATTR) |
+ KEY_USR_VIEW | KEY_USR_READ |
+ KEY_USR_WRITE | KEY_USR_SEARCH,
+ KEY_ALLOC_NOT_IN_QUOTA, NULL);
+
+ ima_blacklist_keyring = keyring_alloc(".ima_blacklist",
+ KUIDT_INIT(0), KGIDT_INIT(0), current_cred(),
+ (KEY_POS_ALL & ~KEY_POS_SETATTR) |
+ KEY_USR_VIEW | KEY_USR_READ |
+ KEY_USR_WRITE | KEY_USR_SEARCH,
+ KEY_ALLOC_NOT_IN_QUOTA, NULL);
+
+ if (IS_ERR(ima_mok_keyring) || IS_ERR(ima_blacklist_keyring))
+ panic("Can't allocate IMA MOK or blacklist keyrings.");
+ set_bit(KEY_FLAG_TRUSTED_ONLY, &ima_mok_keyring->flags);
+ set_bit(KEY_FLAG_TRUSTED_ONLY, &ima_blacklist_keyring->flags);
+ return 0;
+}
+
+module_init(ima_mok_init);