SELinux: Add a capabilities bitmap to SELinux policy version 22
Add a new policy capabilities bitmap to SELinux policy version 22. This bitmap
will enable the security server to query the policy to determine which features
it supports.
Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>
diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
index 397fd49..a857405 100644
--- a/security/selinux/selinuxfs.c
+++ b/security/selinux/selinuxfs.c
@@ -2,6 +2,11 @@
*
* Added conditional policy language extensions
*
+ * Updated: Hewlett-Packard <paul.moore@hp.com>
+ *
+ * Added support for the policy capability bitmap
+ *
+ * Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
* Copyright (C) 2003 - 2004 Tresys Technology, LLC
* Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
* This program is free software; you can redistribute it and/or modify
@@ -35,6 +40,11 @@
#include "objsec.h"
#include "conditional.h"
+/* Policy capability filenames */
+static char *policycap_names[] = {
+ "network_peer_controls"
+};
+
unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
#ifdef CONFIG_SECURITY_SELINUX_ENABLE_SECMARK_DEFAULT
@@ -72,6 +82,9 @@
static struct dentry *class_dir = NULL;
static unsigned long last_class_ino;
+/* global data for policy capabilities */
+static struct dentry *policycap_dir = NULL;
+
extern void selnl_notify_setenforce(int val);
/* Check whether a task is allowed to use a security operation. */
@@ -111,10 +124,11 @@
static unsigned long sel_last_ino = SEL_INO_NEXT - 1;
-#define SEL_INITCON_INO_OFFSET 0x01000000
-#define SEL_BOOL_INO_OFFSET 0x02000000
-#define SEL_CLASS_INO_OFFSET 0x04000000
-#define SEL_INO_MASK 0x00ffffff
+#define SEL_INITCON_INO_OFFSET 0x01000000
+#define SEL_BOOL_INO_OFFSET 0x02000000
+#define SEL_CLASS_INO_OFFSET 0x04000000
+#define SEL_POLICYCAP_INO_OFFSET 0x08000000
+#define SEL_INO_MASK 0x00ffffff
#define TMPBUFLEN 12
static ssize_t sel_read_enforce(struct file *filp, char __user *buf,
@@ -263,6 +277,7 @@
/* declaration for sel_write_load */
static int sel_make_bools(void);
static int sel_make_classes(void);
+static int sel_make_policycap(void);
/* declaration for sel_make_class_dirs */
static int sel_make_dir(struct inode *dir, struct dentry *dentry,
@@ -323,6 +338,12 @@
}
ret = sel_make_classes();
+ if (ret) {
+ length = ret;
+ goto out1;
+ }
+
+ ret = sel_make_policycap();
if (ret)
length = ret;
else
@@ -1399,6 +1420,24 @@
.read = sel_read_perm,
};
+static ssize_t sel_read_policycap(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ int value;
+ char tmpbuf[TMPBUFLEN];
+ ssize_t length;
+ unsigned long i_ino = file->f_path.dentry->d_inode->i_ino;
+
+ value = security_policycap_supported(i_ino & SEL_INO_MASK);
+ length = scnprintf(tmpbuf, TMPBUFLEN, "%d", value);
+
+ return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
+}
+
+static const struct file_operations sel_policycap_ops = {
+ .read = sel_read_policycap,
+};
+
static int sel_make_perm_files(char *objclass, int classvalue,
struct dentry *dir)
{
@@ -1545,6 +1584,36 @@
return rc;
}
+static int sel_make_policycap(void)
+{
+ unsigned int iter;
+ struct dentry *dentry = NULL;
+ struct inode *inode = NULL;
+
+ sel_remove_entries(policycap_dir);
+
+ for (iter = 0; iter <= POLICYDB_CAPABILITY_MAX; iter++) {
+ if (iter < ARRAY_SIZE(policycap_names))
+ dentry = d_alloc_name(policycap_dir,
+ policycap_names[iter]);
+ else
+ dentry = d_alloc_name(policycap_dir, "unknown");
+
+ if (dentry == NULL)
+ return -ENOMEM;
+
+ inode = sel_make_inode(policycap_dir->d_sb, S_IFREG | S_IRUGO);
+ if (inode == NULL)
+ return -ENOMEM;
+
+ inode->i_fop = &sel_policycap_ops;
+ inode->i_ino = iter | SEL_POLICYCAP_INO_OFFSET;
+ d_add(dentry, inode);
+ }
+
+ return 0;
+}
+
static int sel_make_dir(struct inode *dir, struct dentry *dentry,
unsigned long *ino)
{
@@ -1673,6 +1742,18 @@
class_dir = dentry;
+ dentry = d_alloc_name(sb->s_root, "policy_capabilities");
+ if (!dentry) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ ret = sel_make_dir(root_inode, dentry, &sel_last_ino);
+ if (ret)
+ goto err;
+
+ policycap_dir = dentry;
+
out:
return ret;
err: