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

Lakshmi Ramasubramanian
2019-11-06T19:01:58Z

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@linux.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