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authorPaul Moore <paul.moore@hp.com>2009-08-28 18:12:49 -0400
committerJames Morris <jmorris@namei.org>2009-09-01 08:29:52 +1000
commited6d76e4c32de0c2ad5f1d572b948ef49e465176 (patch)
tree893914916ad849fefed72df48bca0bf9c78e392d /security/selinux/hooks.c
parent2b980dbd77d229eb60588802162c9659726b11f4 (diff)
selinux: Support for the new TUN LSM hooks
Add support for the new TUN LSM hooks: security_tun_dev_create(), security_tun_dev_post_create() and security_tun_dev_attach(). This includes the addition of a new object class, tun_socket, which represents the socks associated with TUN devices. The _tun_dev_create() and _tun_dev_post_create() hooks are fairly similar to the standard socket functions but _tun_dev_attach() is a bit special. The _tun_dev_attach() is unique because it involves a domain attaching to an existing TUN device and its associated tun_socket object, an operation which does not exist with standard sockets and most closely resembles a relabel operation. Signed-off-by: Paul Moore <paul.moore@hp.com> Acked-by: Eric Paris <eparis@parisplace.org> Signed-off-by: James Morris <jmorris@namei.org>
Diffstat (limited to 'security/selinux/hooks.c')
-rw-r--r--security/selinux/hooks.c60
1 files changed, 58 insertions, 2 deletions
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index ac79f9ef2da..27b4c552735 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -13,8 +13,8 @@
* Eric Paris <eparis@redhat.com>
* Copyright (C) 2004-2005 Trusted Computer Solutions, Inc.
* <dgoeddel@trustedcs.com>
- * Copyright (C) 2006, 2007 Hewlett-Packard Development Company, L.P.
- * Paul Moore <paul.moore@hp.com>
+ * Copyright (C) 2006, 2007, 2009 Hewlett-Packard Development Company, L.P.
+ * Paul Moore <paul.moore@hp.com>
* Copyright (C) 2007 Hitachi Software Engineering Co., Ltd.
* Yuichi Nakamura <ynakam@hitachisoft.jp>
*
@@ -4325,6 +4325,59 @@ static void selinux_req_classify_flow(const struct request_sock *req,
fl->secid = req->secid;
}
+static int selinux_tun_dev_create(void)
+{
+ u32 sid = current_sid();
+
+ /* we aren't taking into account the "sockcreate" SID since the socket
+ * that is being created here is not a socket in the traditional sense,
+ * instead it is a private sock, accessible only to the kernel, and
+ * representing a wide range of network traffic spanning multiple
+ * connections unlike traditional sockets - check the TUN driver to
+ * get a better understanding of why this socket is special */
+
+ return avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET, TUN_SOCKET__CREATE,
+ NULL);
+}
+
+static void selinux_tun_dev_post_create(struct sock *sk)
+{
+ struct sk_security_struct *sksec = sk->sk_security;
+
+ /* we don't currently perform any NetLabel based labeling here and it
+ * isn't clear that we would want to do so anyway; while we could apply
+ * labeling without the support of the TUN user the resulting labeled
+ * traffic from the other end of the connection would almost certainly
+ * cause confusion to the TUN user that had no idea network labeling
+ * protocols were being used */
+
+ /* see the comments in selinux_tun_dev_create() about why we don't use
+ * the sockcreate SID here */
+
+ sksec->sid = current_sid();
+ sksec->sclass = SECCLASS_TUN_SOCKET;
+}
+
+static int selinux_tun_dev_attach(struct sock *sk)
+{
+ struct sk_security_struct *sksec = sk->sk_security;
+ u32 sid = current_sid();
+ int err;
+
+ err = avc_has_perm(sid, sksec->sid, SECCLASS_TUN_SOCKET,
+ TUN_SOCKET__RELABELFROM, NULL);
+ if (err)
+ return err;
+ err = avc_has_perm(sid, sid, SECCLASS_TUN_SOCKET,
+ TUN_SOCKET__RELABELTO, NULL);
+ if (err)
+ return err;
+
+ sksec->sid = sid;
+
+ return 0;
+}
+
static int selinux_nlmsg_perm(struct sock *sk, struct sk_buff *skb)
{
int err = 0;
@@ -5494,6 +5547,9 @@ static struct security_operations selinux_ops = {
.inet_csk_clone = selinux_inet_csk_clone,
.inet_conn_established = selinux_inet_conn_established,
.req_classify_flow = selinux_req_classify_flow,
+ .tun_dev_create = selinux_tun_dev_create,
+ .tun_dev_post_create = selinux_tun_dev_post_create,
+ .tun_dev_attach = selinux_tun_dev_attach,
#ifdef CONFIG_SECURITY_NETWORK_XFRM
.xfrm_policy_alloc_security = selinux_xfrm_policy_alloc,