diff --git a/crypto/asymmetric_keys/x509_public_key.c b/crypto/asymmetric_keys/x509_public_key.c
index 2a44b3752471d0b34d19fbe4a66305863dfcafb8..9e9e5a6a9ed63a156ddf5a58b726cadc00ef1e3a 100644
--- a/crypto/asymmetric_keys/x509_public_key.c
+++ b/crypto/asymmetric_keys/x509_public_key.c
@@ -321,6 +321,8 @@ static int x509_key_preparse(struct key_preparsed_payload *prep)
goto error_free_cert;
} else if (!prep->trusted) {
ret = x509_validate_trust(cert, get_system_trusted_keyring());
+ if (ret)
+ ret = x509_validate_trust(cert, get_ima_mok_keyring());
if (!ret)
prep->trusted = 1;
}
diff --git a/include/keys/system_keyring.h b/include/keys/system_keyring.h
index b20cd885c1fd84b01d5b5602177777a74ea64810..39fd38cfa8c96512e59360f151eebb07eb74be1f 100644
--- a/include/keys/system_keyring.h
+++ b/include/keys/system_keyring.h
@@ -35,4 +35,28 @@ extern int system_verify_data(const void *data, unsigned long len,
enum key_being_used_for usage);
#endif
+#ifdef CONFIG_IMA_MOK_KEYRING
+extern struct key *ima_mok_keyring;
+extern struct key *ima_blacklist_keyring;
+
+static inline struct key *get_ima_mok_keyring(void)
+{
+ return ima_mok_keyring;
+}
+static inline struct key *get_ima_blacklist_keyring(void)
+{
+ return ima_blacklist_keyring;
+}
+#else
+static inline struct key *get_ima_mok_keyring(void)
+{
+ return NULL;
+}
+static inline struct key *get_ima_blacklist_keyring(void)
+{
+ return NULL;
+}
+#endif /* CONFIG_IMA_MOK_KEYRING */
+
+
#endif /* _KEYS_SYSTEM_KEYRING_H */
diff --git a/security/integrity/digsig_asymmetric.c b/security/integrity/digsig_asymmetric.c
index 4fec1816a2b3b18385a2ec5c5590e4d72dc7775b..5ade2a7517a6341305ba4aafbb18469cd1ed8db8 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 e74d66cbfe87a915271d39cf5bd801f85dc528d8..8d5e6e0e0937c0d0a4467a4fb1f80fc74decafb7 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 d79263d2fdbfd0098666f541db32552c784688ce..a8539f9e060fe359ebb407136aca3f4fe923c9c1 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 0000000000000000000000000000000000000000..18e37f57f5128288e4e27de0bc23c3060a993718
--- /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);