With this commit, the LSM Smack implements the LSM
side part of the system call keyctl with the action
code KEYCTL_GET_SECURITY.
It is now possible to get the context of, for example,
the user session key using the command "keyctl security @s".
Signed-off-by: José Bollo <jose.bo...@open.eurogiciel.org>
---
security/smack/smack_lsm.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index fa64740..c1ff996 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -3208,6 +3208,35 @@ static int smack_key_permission(key_ref_t
key_ref,
return smk_access(tsp, keyp->security,
MAY_READWRITE, &ad);
}
+
+/*
+ * smack_key_getsecurity - Smack label tagging the key
+ * @key points to the key to be queried
+ * @_buffer points to a pointer that should be set to point to the
+ * resulting string (if no label or an error occurs).
+ * Return the length of the string (including terminating NUL) or -ve
if
+ * an error.
+ * May also return 0 (and a NULL buffer pointer) if there is no label.
+ */
+static int smack_key_getsecurity(struct key *key, char **_buffer)
+{
+ int length;
+ char *copy;
+
+ if (key->security == NULL) {
+ *_buffer = NULL;
+ return 0;
+ }
+
+ length = (int)strlen(key->security) + 1;
+ copy = kmalloc((size_t)length, GFP_KERNEL);
+ if (copy == NULL)
+ return -ENOMEM;
+
+ memcpy(copy, key->security, (size_t)length);
+ *_buffer = copy;
+ return length;
+}
#endif /* CONFIG_KEYS */
/*
@@ -3514,6 +3543,7 @@ struct security_operations smack_ops = {
.key_alloc = smack_key_alloc,
.key_free = smack_key_free,
.key_permission = smack_key_permission,
+ .key_getsecurity = smack_key_getsecurity,
#endif /* CONFIG_KEYS */
/* Audit hooks */
--
2.1.2
--
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