[LSM-IPSec]: Security association restriction.

This patch series implements per packet access control via the
extension of the Linux Security Modules (LSM) interface by hooks in
the XFRM and pfkey subsystems that leverage IPSec security
associations to label packets.  Extensions to the SELinux LSM are
included that leverage the patch for this purpose.

This patch implements the changes necessary to the XFRM subsystem,
pfkey interface, ipv4/ipv6, and xfrm_user interface to restrict a
socket to use only authorized security associations (or no security
association) to send/receive network packets.

Patch purpose:

The patch is designed to enable access control per packets based on
the strongly authenticated IPSec security association.  Such access
controls augment the existing ones based on network interface and IP
address.  The former are very coarse-grained, and the latter can be
spoofed.  By using IPSec, the system can control access to remote
hosts based on cryptographic keys generated using the IPSec mechanism.
This enables access control on a per-machine basis or per-application
if the remote machine is running the same mechanism and trusted to
enforce the access control policy.

Patch design approach:

The overall approach is that policy (xfrm_policy) entries set by
user-level programs (e.g., setkey for ipsec-tools) are extended with a
security context that is used at policy selection time in the XFRM
subsystem to restrict the sockets that can send/receive packets via
security associations (xfrm_states) that are built from those
policies.

A presentation available at
www.selinux-symposium.org/2005/presentations/session2/2-3-jaeger.pdf
from the SELinux symposium describes the overall approach.

Patch implementation details:

On output, the policy retrieved (via xfrm_policy_lookup or
xfrm_sk_policy_lookup) must be authorized for the security context of
the socket and the same security context is required for resultant
security association (retrieved or negotiated via racoon in
ipsec-tools).  This is enforced in xfrm_state_find.

On input, the policy retrieved must also be authorized for the socket
(at __xfrm_policy_check), and the security context of the policy must
also match the security association being used.

The patch has virtually no impact on packets that do not use IPSec.
The existing Netfilter (outgoing) and LSM rcv_skb hooks are used as
before.

Also, if IPSec is used without security contexts, the impact is
minimal.  The LSM must allow such policies to be selected for the
combination of socket and remote machine, but subsequent IPSec
processing proceeds as in the original case.

Testing:

The pfkey interface is tested using the ipsec-tools.  ipsec-tools have
been modified (a separate ipsec-tools patch is available for version
0.5) that supports assignment of xfrm_policy entries and security
associations with security contexts via setkey and the negotiation
using the security contexts via racoon.

The xfrm_user interface is tested via ad hoc programs that set
security contexts.  These programs are also available from me, and
contain programs for setting, getting, and deleting policy for testing
this interface.  Testing of sa functions was done by tracing kernel
behavior.

Signed-off-by: Trent Jaeger <tjaeger@cse.psu.edu>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 57 insertions, 1 deletions

diff --git a/security/Kconfig b/security/Kconfig
index 64d3f1e9ca85..34f593410d57 100644
--- a/security/Kconfig
+++ b/security/Kconfig
@@ -54,6 +54,19 @@ config SECURITY_NETWORK
           implement socket and networking access controls.
           If you are unsure how to answer this question, answer N.
 
+config SECURITY_NETWORK_XFRM
+        bool "XFRM (IPSec) Networking Security Hooks"
+        depends on XFRM && SECURITY_NETWORK
+        help
+          This enables the XFRM (IPSec) networking security hooks.
+          If enabled, a security module can use these hooks to
+          implement per-packet access controls based on labels
+          derived from IPSec policy.  Non-IPSec communications are
+          designated as unlabelled, and only sockets authorized
+          to communicate unlabelled data can send without using
+          IPSec.
+          If you are unsure how to answer this question, answer N.
+
 config SECURITY_CAPABILITIES
         tristate "Default Linux Capabilities"
         depends on SECURITY
diff --git a/security/dummy.c b/security/dummy.c
index 3ca5f2b828a0..a15c54709fde 100644
--- a/security/dummy.c
+++ b/security/dummy.c
@@ -776,8 +776,42 @@ static inline int dummy_sk_alloc_security (struct sock *sk, int family, gfp_t pr
 static inline void dummy_sk_free_security (struct sock *sk)
 {
 }
+
+static unsigned int dummy_sk_getsid(struct sock *sk, struct flowi *fl, u8 dir)
+{
+        return 0;
+}
 #endif  /* CONFIG_SECURITY_NETWORK */
 
+#ifdef CONFIG_SECURITY_NETWORK_XFRM
+static int dummy_xfrm_policy_alloc_security(struct xfrm_policy *xp, struct xfrm_user_sec_ctx *sec_ctx)
+{
+        return 0;
+}
+
+static inline int dummy_xfrm_policy_clone_security(struct xfrm_policy *old, struct xfrm_policy *new)
+{
+        return 0;
+}
+
+static void dummy_xfrm_policy_free_security(struct xfrm_policy *xp)
+{
+}
+
+static int dummy_xfrm_state_alloc_security(struct xfrm_state *x, struct xfrm_user_sec_ctx *sec_ctx)
+{
+        return 0;
+}
+
+static void dummy_xfrm_state_free_security(struct xfrm_state *x)
+{
+}
+
+static int dummy_xfrm_policy_lookup(struct xfrm_policy *xp, u32 sk_sid, u8 dir)
+{
+        return 0;
+}
+#endif /* CONFIG_SECURITY_NETWORK_XFRM */
 static int dummy_register_security (const char *name, struct security_operations *ops)
 {
         return -EINVAL;
@@ -970,7 +1004,16 @@ void security_fixup_ops (struct security_operations *ops)
         set_to_dummy_if_null(ops, socket_getpeersec);
         set_to_dummy_if_null(ops, sk_alloc_security);
         set_to_dummy_if_null(ops, sk_free_security);
-#endif  /* CONFIG_SECURITY_NETWORK */
+        set_to_dummy_if_null(ops, sk_getsid);
+ #endif /* CONFIG_SECURITY_NETWORK */
+#ifdef  CONFIG_SECURITY_NETWORK_XFRM
+        set_to_dummy_if_null(ops, xfrm_policy_alloc_security);
+        set_to_dummy_if_null(ops, xfrm_policy_clone_security);
+        set_to_dummy_if_null(ops, xfrm_policy_free_security);
+        set_to_dummy_if_null(ops, xfrm_state_alloc_security);
+        set_to_dummy_if_null(ops, xfrm_state_free_security);
+        set_to_dummy_if_null(ops, xfrm_policy_lookup);
+#endif  /* CONFIG_SECURITY_NETWORK_XFRM */
 #ifdef CONFIG_KEYS
         set_to_dummy_if_null(ops, key_alloc);
         set_to_dummy_if_null(ops, key_free);