linux-kernel - [PATCH v4 01/10] IMA: Defined an IMA hook to measure keys on key create or update

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Message-Id: <20191106190116.2578-2-nramas@linux.microsoft.com>
Date:   Wed,  6 Nov 2019 11:01:07 -0800
From:   Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
To:     zohar@...ux.ibm.com, dhowells@...hat.com,
        matthewgarrett@...gle.com, sashal@...nel.org,
        jamorris@...ux.microsoft.com, linux-integrity@...r.kernel.org,
        linux-security-module@...r.kernel.org, keyrings@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 01/10] IMA: Defined an IMA hook to measure keys on key create or update

Asymmetric keys used for verifying file signatures or certificates
are currently not included in the IMA measurement list.

This patch defines a new IMA hook namely ima_post_key_create_or_update()
to measure asymmetric keys.

Signed-off-by: Lakshmi Ramasubramanian <nramas@...ux.microsoft.com>
---
 security/integrity/ima/ima_main.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index d7e987baf127..a0e233afe876 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -721,6 +721,22 @@ void ima_kexec_cmdline(const void *buf, int size)
 					   KEXEC_CMDLINE, 0);
 }
 
+/**
+ * ima_post_key_create_or_update - measure asymmetric keys
+ * @keyring: keyring to which the key is linked to
+ * @key: created or updated key
+ * @flags: key flags
+ * @create: flag indicating whether the key was created or updated
+ *
+ * Keys can only be measured, not appraised.
+ */
+void ima_post_key_create_or_update(struct key *keyring, struct key *key,
+				   unsigned long flags, bool create)
+{
+	if ((keyring != NULL) && (key != NULL))
+		return;
+}
+
 static int __init init_ima(void)
 {
 	int error;
-- 
2.17.1