6:06 a.m.
From: Ahmed S. Darwish <darwish.07(a)gmail.com>
Introduce a generic Audit interface for security modules
by adding the following new LSM hooks:
audit_rule_init(field, op, rulestr, lsmrule)
audit_rule_known(krule)
audit_rule_match(secid, field, op, rule, actx)
audit_rule_free(rule)
Those hooks are only available if CONFIG_AUDIT is enabled.
Signed-off-by: Casey Schaufler <casey(a)schaufler-ca.com>
Signed-off-by: Ahmed S. Darwish <darwish.07(a)gmail.com>
Acked-by: James Morris <jmorris(a)namei.org>
Reviewed-by: Paul Moore <paul.moore(a)hp.com>
---
include/linux/security.h | 72 ++++++++++++++++++++++++++++++++++++++++++++++
security/dummy.c | 31 +++++++++++++++++++-
security/security.c | 25 ++++++++++++++++
3 files changed, 127 insertions(+), 1 deletions(-)
diff --git a/include/linux/security.h b/include/linux/security.h
index 45717d9..697f228 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -37,6 +37,7 @@
extern unsigned securebits;
struct ctl_table;
+struct audit_krule;
/*
* These functions are in security/capability.c and are used
@@ -1235,6 +1236,37 @@ static inline void security_free_mnt_opts(struct security_mnt_opts
*opts)
* @secdata contains the security context.
* @seclen contains the length of the security context.
*
+ * Security hooks for Audit
+ *
+ * @audit_rule_init:
+ * Allocate and initialize an LSM audit rule structure.
+ * @field contains the required Audit action. Fields flags are defined in
include/linux/audit.h
+ * @op contains the operator the rule uses.
+ * @rulestr contains the context where the rule will be applied to.
+ * @lsmrule contains a pointer to receive the result.
+ * Return 0 if @lsmrule has been successfully set,
+ * -EINVAL in case of an invalid rule.
+ *
+ * @audit_rule_known:
+ * Specifies whether given @rule contains any fields related to current LSM.
+ * @rule contains the audit rule of interest.
+ * Return 1 in case of relation found, 0 otherwise.
+ *
+ * @audit_rule_match:
+ * Determine if given @secid matches a rule previously approved
+ * by @audit_rule_known.
+ * @secid contains the security id in question.
+ * @field contains the field which relates to current LSM.
+ * @op contains the operator that will be used for matching.
+ * @rule points to the audit rule that will be checked against.
+ * @actx points to the audit context associated with the check.
+ * Return 1 if secid matches the rule, 0 if it does not, -ERRNO on failure.
+ *
+ * @audit_rule_free:
+ * Deallocate the LSM audit rule structure previously allocated by
+ * audit_rule_init.
+ * @rule contains the allocated rule
+ *
* This is the main security structure.
*/
struct security_operations {
@@ -1494,6 +1526,13 @@ struct security_operations {
#endif /* CONFIG_KEYS */
+#ifdef CONFIG_AUDIT
+ int (*audit_rule_init)(u32 field, u32 op, char *rulestr, void **lsmrule);
+ int (*audit_rule_known)(struct audit_krule *krule);
+ int (*audit_rule_match)(u32 secid, u32 field, u32 op, void *lsmrule,
+ struct audit_context *actx);
+ void (*audit_rule_free)(void *lsmrule);
+#endif /* CONFIG_AUDIT */
};
/* prototypes */
@@ -2700,5 +2739,38 @@ static inline int security_key_permission(key_ref_t key_ref,
#endif
#endif /* CONFIG_KEYS */
+#ifdef CONFIG_AUDIT
+#ifdef CONFIG_SECURITY
+int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule);
+int security_audit_rule_known(struct audit_krule *krule);
+int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule,
+ struct audit_context *actx);
+void security_audit_rule_free(void *lsmrule);
+
+#else
+
+static inline int security_audit_rule_init(u32 field, u32 op, char *rulestr,
+ void **lsmrule)
+{
+ return 0;
+}
+
+static inline int security_audit_rule_known(struct audit_krule *krule)
+{
+ return 0;
+}
+
+static inline int security_audit_rule_match(u32 secid, u32 field, u32 op,
+ void *lsmrule, struct audit_context *actx)
+{
+ return 0;
+}
+
+static inline void security_audit_rule_free(void *lsmrule)
+{ }
+
+#endif /* CONFIG_SECURITY */
+#endif /* CONFIG_AUDIT */
+
#endif /* ! __LINUX_SECURITY_H */
diff --git a/security/dummy.c b/security/dummy.c
index fb2e942..1ac9f8e 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -993,6 +993,30 @@ static inline int dummy_key_permission(key_ref_t key_ref,
}
#endif /* CONFIG_KEYS */
+#ifdef CONFIG_AUDIT
+static inline int dummy_audit_rule_init(u32 field, u32 op, char *rulestr,
+ void **lsmrule)
+{
+ return 0;
+}
+
+static inline int dummy_audit_rule_known(struct audit_krule *krule)
+{
+ return 0;
+}
+
+static inline int dummy_audit_rule_match(u32 secid, u32 field, u32 op,
+ void *lsmrule,
+ struct audit_context *actx)
+{
+ return 0;
+}
+
+static inline void dummy_audit_rule_free(void *lsmrule)
+{ }
+
+#endif /* CONFIG_AUDIT */
+
struct security_operations dummy_security_ops;
#define set_to_dummy_if_null(ops, function) \
@@ -1182,6 +1206,11 @@ void security_fixup_ops (struct security_operations *ops)
set_to_dummy_if_null(ops, key_free);
set_to_dummy_if_null(ops, key_permission);
#endif /* CONFIG_KEYS */
-
+#ifdef CONFIG_AUDIT
+ set_to_dummy_if_null(ops, audit_rule_init);
+ set_to_dummy_if_null(ops, audit_rule_known);
+ set_to_dummy_if_null(ops, audit_rule_match);
+ set_to_dummy_if_null(ops, audit_rule_free);
+#endif
}
diff --git a/security/security.c b/security/security.c
index 33e59a7..bf189d2 100644
--- a/security/security.c
+++ b/security/security.c
@@ -1120,3 +1120,28 @@ int security_key_permission(key_ref_t key_ref,
}
#endif /* CONFIG_KEYS */
+
+#ifdef CONFIG_AUDIT
+
+int security_audit_rule_init(u32 field, u32 op, char *rulestr, void **lsmrule)
+{
+ return security_ops->audit_rule_init(field, op, rulestr, lsmrule);
+}
+
+int security_audit_rule_known(struct audit_krule *krule)
+{
+ return security_ops->audit_rule_known(krule);
+}
+
+void security_audit_rule_free(void *lsmrule)
+{
+ security_ops->audit_rule_free(lsmrule);
+}
+
+int security_audit_rule_match(u32 secid, u32 field, u32 op, void *lsmrule,
+ struct audit_context *actx)
+{
+ return security_ops->audit_rule_match(secid, field, op, lsmrule, actx);
+}
+
+#endif /* CONFIG_AUDIT */
--
1.5.4.2