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audit: allow interfield comparison in audit rules

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We wish to be able to audit when a uid=500 task accesses a file which is
uid=0.  Or vice versa.  This patch introduces a new audit filter type
AUDIT_FIELD_COMPARE which takes as an 'enum' which indicates which fields
should be compared.  At this point we only define the task->uid vs
inode->uid, but other comparisons can be added.

Signed-off-by: Eric Paris <eparis@redhat.com>
This commit is contained in:
Eric Paris
2012-01-03 14:23:08 -05:00
committed by Al Viro
parent 29ef73b7a8
commit 02d86a568c
3 changed files with 37 additions and 2 deletions
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kernel/auditsc.c
+29 -1
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@@ -463,6 +463,32 @@ static int match_tree_refs(struct audit_context *ctx, struct audit_tree *tree)
return 0;
}
static int audit_field_compare(struct task_struct *tsk,
const struct cred *cred,
struct audit_field *f,
struct audit_context *ctx,
struct audit_names *name)
{
struct audit_names *n;
switch (f->val) {
case AUDIT_COMPARE_UID_TO_OBJ_UID:
if (name) {
return audit_comparator(cred->uid, f->op, name->uid);
} else if (ctx) {
list_for_each_entry(n, &ctx->names_list, list) {
if (audit_comparator(cred->uid, f->op, n->uid))
return 1;
}
}
break;
default:
WARN(1, "Missing AUDIT_COMPARE define. Report as a bug\n");
return 0;
}
return 0;
}
/* Determine if any context name data matches a rule's watch data */
/* Compare a task_struct with an audit_rule. Return 1 on match, 0
* otherwise.
@@ -693,8 +719,10 @@ static int audit_filter_rules(struct task_struct *tsk,
case AUDIT_FILETYPE:
result = audit_match_filetype(ctx, f->val);
break;
case AUDIT_FIELD_COMPARE:
result = audit_field_compare(tsk, cred, f, ctx, name);
break;
}
if (!result)
return 0;
}