[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>

5 files changed, 396 insertions, 54 deletions

diff --git a/net/core/flow.c b/net/core/flow.c
index 7e95b39de9fd..c4f25385029f 100644
--- a/net/core/flow.c
+++ b/net/core/flow.c
@@ -23,6 +23,7 @@
 #include <net/flow.h>
 #include <asm/atomic.h>
 #include <asm/semaphore.h>
+#include <linux/security.h>
 
 struct flow_cache_entry {
         struct flow_cache_entry *next;
@@ -30,6 +31,7 @@ struct flow_cache_entry {
         u8                      dir;
         struct flowi            key;
         u32                     genid;
+        u32                     sk_sid;
         void                    *object;
         atomic_t                *object_ref;
 };
@@ -162,7 +164,7 @@ static int flow_key_compare(struct flowi *key1, struct flowi *key2)
         return 0;
 }
 
-void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
+void *flow_cache_lookup(struct flowi *key, u32 sk_sid, u16 family, u8 dir,
                         flow_resolve_t resolver)
 {
         struct flow_cache_entry *fle, **head;
@@ -186,6 +188,7 @@ void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
         for (fle = *head; fle; fle = fle->next) {
                 if (fle->family == family &&
                     fle->dir == dir &&
+                    fle->sk_sid == sk_sid &&
                     flow_key_compare(key, &fle->key) == 0) {
                         if (fle->genid == atomic_read(&flow_cache_genid)) {
                                 void *ret = fle->object;
@@ -210,6 +213,7 @@ void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
                         *head = fle;
                         fle->family = family;
                         fle->dir = dir;
+                        fle->sk_sid = sk_sid;
                         memcpy(&fle->key, key, sizeof(*key));
                         fle->object = NULL;
                         flow_count(cpu)++;
@@ -221,7 +225,7 @@ nocache:
                 void *obj;
                 atomic_t *obj_ref;
 
-                resolver(key, family, dir, &obj, &obj_ref);
+                resolver(key, sk_sid, family, dir, &obj, &obj_ref);
 
                 if (fle) {
                         fle->genid = atomic_read(&flow_cache_genid);
diff --git a/net/key/af_key.c b/net/key/af_key.c
index 39031684b65c..d32f7791f1e4 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -336,6 +336,7 @@ static u8 sadb_ext_min_len[] = {
         [SADB_X_EXT_NAT_T_SPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
         [SADB_X_EXT_NAT_T_DPORT]        = (u8) sizeof(struct sadb_x_nat_t_port),
         [SADB_X_EXT_NAT_T_OA]           = (u8) sizeof(struct sadb_address),
+        [SADB_X_EXT_SEC_CTX]            = (u8) sizeof(struct sadb_x_sec_ctx),
 };
 
 /* Verify sadb_address_{len,prefixlen} against sa_family.  */
@@ -383,6 +384,55 @@ static int verify_address_len(void *p)
         return 0;
 }
 
+static inline int pfkey_sec_ctx_len(struct sadb_x_sec_ctx *sec_ctx)
+{
+        int len = 0;
+
+        len += sizeof(struct sadb_x_sec_ctx);
+        len += sec_ctx->sadb_x_ctx_len;
+        len += sizeof(uint64_t) - 1;
+        len /= sizeof(uint64_t);
+
+        return len;
+}
+
+static inline int verify_sec_ctx_len(void *p)
+{
+        struct sadb_x_sec_ctx *sec_ctx = (struct sadb_x_sec_ctx *)p;
+        int len;
+
+        if (sec_ctx->sadb_x_ctx_len > PAGE_SIZE)
+                return -EINVAL;
+
+        len = pfkey_sec_ctx_len(sec_ctx);
+
+        if (sec_ctx->sadb_x_sec_len != len)
+                return -EINVAL;
+
+        return 0;
+}
+
+static inline struct xfrm_user_sec_ctx *pfkey_sadb2xfrm_user_sec_ctx(struct sadb_x_sec_ctx *sec_ctx)
+{
+        struct xfrm_user_sec_ctx *uctx = NULL;
+        int ctx_size = sec_ctx->sadb_x_ctx_len;
+
+        uctx = kmalloc((sizeof(*uctx)+ctx_size), GFP_KERNEL);
+
+        if (!uctx)
+                return NULL;
+
+        uctx->len = pfkey_sec_ctx_len(sec_ctx);
+        uctx->exttype = sec_ctx->sadb_x_sec_exttype;
+        uctx->ctx_doi = sec_ctx->sadb_x_ctx_doi;
+        uctx->ctx_alg = sec_ctx->sadb_x_ctx_alg;
+        uctx->ctx_len = sec_ctx->sadb_x_ctx_len;
+        memcpy(uctx + 1, sec_ctx + 1,
+               uctx->ctx_len);
+
+        return uctx;
+}
+
 static int present_and_same_family(struct sadb_address *src,
                                    struct sadb_address *dst)
 {
@@ -438,6 +488,10 @@ static int parse_exthdrs(struct sk_buff *skb, struct sadb_msg *hdr, void **ext_h
                                 if (verify_address_len(p))
                                         return -EINVAL;
                         }                               
+                        if (ext_type == SADB_X_EXT_SEC_CTX) {
+                                if (verify_sec_ctx_len(p))
+                                        return -EINVAL;
+                        }
                         ext_hdrs[ext_type-1] = p;
                 }
                 p   += ext_len;
@@ -586,6 +640,9 @@ static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys,
         struct sadb_key *key;
         struct sadb_x_sa2 *sa2;
         struct sockaddr_in *sin;
+        struct sadb_x_sec_ctx *sec_ctx;
+        struct xfrm_sec_ctx *xfrm_ctx;
+        int ctx_size = 0;
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
         struct sockaddr_in6 *sin6;
 #endif
@@ -609,6 +666,12 @@ static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys,
                         sizeof(struct sadb_address)*2 + 
                                 sockaddr_size*2 +
                                         sizeof(struct sadb_x_sa2);
+
+        if ((xfrm_ctx = x->security)) {
+                ctx_size = PFKEY_ALIGN8(xfrm_ctx->ctx_len);
+                size += sizeof(struct sadb_x_sec_ctx) + ctx_size;
+        }
+
         /* identity & sensitivity */
 
         if ((x->props.family == AF_INET &&
@@ -899,6 +962,20 @@ static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys,
                 n_port->sadb_x_nat_t_port_reserved = 0;
         }
 
+        /* security context */
+        if (xfrm_ctx) {
+                sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb,
+                                sizeof(struct sadb_x_sec_ctx) + ctx_size);
+                sec_ctx->sadb_x_sec_len =
+                  (sizeof(struct sadb_x_sec_ctx) + ctx_size) / sizeof(uint64_t);
+                sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
+                sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
+                sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
+                sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
+                memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
+                       xfrm_ctx->ctx_len);
+        }
+
         return skb;
 }
 
@@ -909,6 +986,7 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
         struct sadb_lifetime *lifetime;
         struct sadb_sa *sa;
         struct sadb_key *key;
+        struct sadb_x_sec_ctx *sec_ctx;
         uint16_t proto;
         int err;
         
@@ -993,6 +1071,21 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
                 x->lft.soft_add_expires_seconds = lifetime->sadb_lifetime_addtime;
                 x->lft.soft_use_expires_seconds = lifetime->sadb_lifetime_usetime;
         }
+
+        sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
+        if (sec_ctx != NULL) {
+                struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
+
+                if (!uctx)
+                        goto out;
+
+                err = security_xfrm_state_alloc(x, uctx);
+                kfree(uctx);
+
+                if (err)
+                        goto out;
+        }
+
         key = (struct sadb_key*) ext_hdrs[SADB_EXT_KEY_AUTH-1];
         if (sa->sadb_sa_auth) {
                 int keysize = 0;
@@ -1720,6 +1813,18 @@ parse_ipsecrequests(struct xfrm_policy *xp, struct sadb_x_policy *pol)
         return 0;
 }
 
+static inline int pfkey_xfrm_policy2sec_ctx_size(struct xfrm_policy *xp)
+{
+  struct xfrm_sec_ctx *xfrm_ctx = xp->security;
+
+        if (xfrm_ctx) {
+                int len = sizeof(struct sadb_x_sec_ctx);
+                len += xfrm_ctx->ctx_len;
+                return PFKEY_ALIGN8(len);
+        }
+        return 0;
+}
+
 static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
 {
         int sockaddr_size = pfkey_sockaddr_size(xp->family);
@@ -1733,7 +1838,8 @@ static int pfkey_xfrm_policy2msg_size(struct xfrm_policy *xp)
                 (sockaddr_size * 2) +
                 sizeof(struct sadb_x_policy) +
                 (xp->xfrm_nr * (sizeof(struct sadb_x_ipsecrequest) +
-                                (socklen * 2)));
+                                (socklen * 2))) +
+                pfkey_xfrm_policy2sec_ctx_size(xp);
 }
 
 static struct sk_buff * pfkey_xfrm_policy2msg_prep(struct xfrm_policy *xp)
@@ -1757,6 +1863,8 @@ static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, i
         struct sadb_lifetime *lifetime;
         struct sadb_x_policy *pol;
         struct sockaddr_in   *sin;
+        struct sadb_x_sec_ctx *sec_ctx;
+        struct xfrm_sec_ctx *xfrm_ctx;
 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
         struct sockaddr_in6  *sin6;
 #endif
@@ -1941,6 +2049,21 @@ static void pfkey_xfrm_policy2msg(struct sk_buff *skb, struct xfrm_policy *xp, i
                         }
                 }
         }
+
+        /* security context */
+        if ((xfrm_ctx = xp->security)) {
+                int ctx_size = pfkey_xfrm_policy2sec_ctx_size(xp);
+
+                sec_ctx = (struct sadb_x_sec_ctx *) skb_put(skb, ctx_size);
+                sec_ctx->sadb_x_sec_len = ctx_size / sizeof(uint64_t);
+                sec_ctx->sadb_x_sec_exttype = SADB_X_EXT_SEC_CTX;
+                sec_ctx->sadb_x_ctx_doi = xfrm_ctx->ctx_doi;
+                sec_ctx->sadb_x_ctx_alg = xfrm_ctx->ctx_alg;
+                sec_ctx->sadb_x_ctx_len = xfrm_ctx->ctx_len;
+                memcpy(sec_ctx + 1, xfrm_ctx->ctx_str,
+                       xfrm_ctx->ctx_len);
+        }
+
         hdr->sadb_msg_len = size / sizeof(uint64_t);
         hdr->sadb_msg_reserved = atomic_read(&xp->refcnt);
 }
@@ -1976,12 +2099,13 @@ out:
 
 static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *hdr, void **ext_hdrs)
 {
-        int err;
+        int err = 0;
         struct sadb_lifetime *lifetime;
         struct sadb_address *sa;
         struct sadb_x_policy *pol;
         struct xfrm_policy *xp;
         struct km_event c;
+        struct sadb_x_sec_ctx *sec_ctx;
 
         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
@@ -2028,6 +2152,22 @@ static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h
         if (xp->selector.dport)
                 xp->selector.dport_mask = ~0;
 
+        sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
+        if (sec_ctx != NULL) {
+                struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
+
+                if (!uctx) {
+                        err = -ENOBUFS;
+                        goto out;
+                }
+
+                err = security_xfrm_policy_alloc(xp, uctx);
+                kfree(uctx);
+
+                if (err)
+                        goto out;
+        }
+
         xp->lft.soft_byte_limit = XFRM_INF;
         xp->lft.hard_byte_limit = XFRM_INF;
         xp->lft.soft_packet_limit = XFRM_INF;
@@ -2051,10 +2191,9 @@ static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h
 
         err = xfrm_policy_insert(pol->sadb_x_policy_dir-1, xp,
                                  hdr->sadb_msg_type != SADB_X_SPDUPDATE);
-        if (err) {
-                kfree(xp);
-                return err;
-        }
+
+        if (err)
+                goto out;
 
         if (hdr->sadb_msg_type == SADB_X_SPDUPDATE)
                 c.event = XFRM_MSG_UPDPOLICY;
@@ -2069,6 +2208,7 @@ static int pfkey_spdadd(struct sock *sk, struct sk_buff *skb, struct sadb_msg *h
         return 0;
 
 out:
+        security_xfrm_policy_free(xp);
         kfree(xp);
         return err;
 }
@@ -2078,9 +2218,10 @@ static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg
         int err;
         struct sadb_address *sa;
         struct sadb_x_policy *pol;
-        struct xfrm_policy *xp;
+        struct xfrm_policy *xp, tmp;
         struct xfrm_selector sel;
         struct km_event c;
+        struct sadb_x_sec_ctx *sec_ctx;
 
         if (!present_and_same_family(ext_hdrs[SADB_EXT_ADDRESS_SRC-1],
                                      ext_hdrs[SADB_EXT_ADDRESS_DST-1]) ||
@@ -2109,7 +2250,24 @@ static int pfkey_spddelete(struct sock *sk, struct sk_buff *skb, struct sadb_msg
         if (sel.dport)
                 sel.dport_mask = ~0;
 
-        xp = xfrm_policy_bysel(pol->sadb_x_policy_dir-1, &sel, 1);
+        sec_ctx = (struct sadb_x_sec_ctx *) ext_hdrs[SADB_X_EXT_SEC_CTX-1];
+        memset(&tmp, 0, sizeof(struct xfrm_policy));
+
+        if (sec_ctx != NULL) {
+                struct xfrm_user_sec_ctx *uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
+
+                if (!uctx)
+                        return -ENOMEM;
+
+                err = security_xfrm_policy_alloc(&tmp, uctx);
+                kfree(uctx);
+
+                if (err)
+                        return err;
+        }
+
+        xp = xfrm_policy_bysel_ctx(pol->sadb_x_policy_dir-1, &sel, tmp.security, 1);
+        security_xfrm_policy_free(&tmp);
         if (xp == NULL)
                 return -ENOENT;
 
@@ -2660,6 +2818,7 @@ static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt,
 {
         struct xfrm_policy *xp;
         struct sadb_x_policy *pol = (struct sadb_x_policy*)data;
+        struct sadb_x_sec_ctx *sec_ctx;
 
         switch (family) {
         case AF_INET:
@@ -2709,10 +2868,32 @@ static struct xfrm_policy *pfkey_compile_policy(u16 family, int opt,
             (*dir = parse_ipsecrequests(xp, pol)) < 0)
                 goto out;
 
+        /* security context too */
+        if (len >= (pol->sadb_x_policy_len*8 +
+            sizeof(struct sadb_x_sec_ctx))) {
+                char *p = (char *)pol;
+                struct xfrm_user_sec_ctx *uctx;
+
+                p += pol->sadb_x_policy_len*8;
+                sec_ctx = (struct sadb_x_sec_ctx *)p;
+                if (len < pol->sadb_x_policy_len*8 +
+                    sec_ctx->sadb_x_sec_len)
+                        goto out;
+                if ((*dir = verify_sec_ctx_len(p)))
+                        goto out;
+                uctx = pfkey_sadb2xfrm_user_sec_ctx(sec_ctx);
+                *dir = security_xfrm_policy_alloc(xp, uctx);
+                kfree(uctx);
+
+                if (*dir)
+                        goto out;
+        }
+
         *dir = pol->sadb_x_policy_dir-1;
         return xp;
 
 out:
+        security_xfrm_policy_free(xp);
         kfree(xp);
         return NULL;
 }
diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index d19e274b9c4a..64a447375fdb 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -10,7 +10,7 @@
  *      YOSHIFUJI Hideaki
  *              Split up af-specific portion
  *      Derek Atkins <derek@ihtfp.com>          Add the post_input processor
- *      
+ *
  */
 
 #include <asm/bug.h>
@@ -256,6 +256,7 @@ void __xfrm_policy_destroy(struct xfrm_policy *policy)
         if (del_timer(&policy->timer))
                 BUG();
 
+        security_xfrm_policy_free(policy);
         kfree(policy);
 }
 EXPORT_SYMBOL(__xfrm_policy_destroy);
@@ -350,7 +351,8 @@ int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
 
         write_lock_bh(&xfrm_policy_lock);
         for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL;) {
-                if (!delpol && memcmp(&policy->selector, &pol->selector, sizeof(pol->selector)) == 0) {
+                if (!delpol && memcmp(&policy->selector, &pol->selector, sizeof(pol->selector)) == 0 &&
+                    xfrm_sec_ctx_match(pol->security, policy->security)) {
                         if (excl) {
                                 write_unlock_bh(&xfrm_policy_lock);
                                 return -EEXIST;
@@ -416,14 +418,15 @@ int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl)
 }
 EXPORT_SYMBOL(xfrm_policy_insert);
 
-struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel,
-                                      int delete)
+struct xfrm_policy *xfrm_policy_bysel_ctx(int dir, struct xfrm_selector *sel,
+                                          struct xfrm_sec_ctx *ctx, int delete)
 {
         struct xfrm_policy *pol, **p;
 
         write_lock_bh(&xfrm_policy_lock);
         for (p = &xfrm_policy_list[dir]; (pol=*p)!=NULL; p = &pol->next) {
-                if (memcmp(sel, &pol->selector, sizeof(*sel)) == 0) {
+                if ((memcmp(sel, &pol->selector, sizeof(*sel)) == 0) &&
+                    (xfrm_sec_ctx_match(ctx, pol->security))) {
                         xfrm_pol_hold(pol);
                         if (delete)
                                 *p = pol->next;
@@ -438,7 +441,7 @@ struct xfrm_policy *xfrm_policy_bysel(int dir, struct xfrm_selector *sel,
         }
         return pol;
 }
-EXPORT_SYMBOL(xfrm_policy_bysel);
+EXPORT_SYMBOL(xfrm_policy_bysel_ctx);
 
 struct xfrm_policy *xfrm_policy_byid(int dir, u32 id, int delete)
 {
@@ -519,7 +522,7 @@ EXPORT_SYMBOL(xfrm_policy_walk);
 
 /* Find policy to apply to this flow. */
 
-static void xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
+static void xfrm_policy_lookup(struct flowi *fl, u32 sk_sid, u16 family, u8 dir,
                                void **objp, atomic_t **obj_refp)
 {
         struct xfrm_policy *pol;
@@ -533,9 +536,12 @@ static void xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
                         continue;
 
                 match = xfrm_selector_match(sel, fl, family);
+
                 if (match) {
-                        xfrm_pol_hold(pol);
-                        break;
+                        if (!security_xfrm_policy_lookup(pol, sk_sid, dir)) {
+                                xfrm_pol_hold(pol);
+                                break;
+                        }
                 }
         }
         read_unlock_bh(&xfrm_policy_lock);
@@ -543,15 +549,37 @@ static void xfrm_policy_lookup(struct flowi *fl, u16 family, u8 dir,
                 *obj_refp = &pol->refcnt;
 }
 
-static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl)
+static inline int policy_to_flow_dir(int dir)
+{
+        if (XFRM_POLICY_IN == FLOW_DIR_IN &&
+            XFRM_POLICY_OUT == FLOW_DIR_OUT &&
+            XFRM_POLICY_FWD == FLOW_DIR_FWD)
+                return dir;
+        switch (dir) {
+        default:
+        case XFRM_POLICY_IN:
+                return FLOW_DIR_IN;
+        case XFRM_POLICY_OUT:
+                return FLOW_DIR_OUT;
+        case XFRM_POLICY_FWD:
+                return FLOW_DIR_FWD;
+        };
+}
+
+static struct xfrm_policy *xfrm_sk_policy_lookup(struct sock *sk, int dir, struct flowi *fl, u32 sk_sid)
 {
         struct xfrm_policy *pol;
 
         read_lock_bh(&xfrm_policy_lock);
         if ((pol = sk->sk_policy[dir]) != NULL) {
-                int match = xfrm_selector_match(&pol->selector, fl,
+                int match = xfrm_selector_match(&pol->selector, fl,
                                                 sk->sk_family);
+                int err = 0;
+
                 if (match)
+                  err = security_xfrm_policy_lookup(pol, sk_sid, policy_to_flow_dir(dir));
+
+                if (match && !err)
                         xfrm_pol_hold(pol);
                 else
                         pol = NULL;
@@ -624,6 +652,10 @@ static struct xfrm_policy *clone_policy(struct xfrm_policy *old, int dir)
 
         if (newp) {
                 newp->selector = old->selector;
+                if (security_xfrm_policy_clone(old, newp)) {
+                        kfree(newp);
+                        return NULL;  /* ENOMEM */
+                }
                 newp->lft = old->lft;
                 newp->curlft = old->curlft;
                 newp->action = old->action;
@@ -735,22 +767,6 @@ xfrm_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx,
         return err;
 }
 
-static inline int policy_to_flow_dir(int dir)
-{
-        if (XFRM_POLICY_IN == FLOW_DIR_IN &&
-            XFRM_POLICY_OUT == FLOW_DIR_OUT &&
-            XFRM_POLICY_FWD == FLOW_DIR_FWD)
-                return dir;
-        switch (dir) {
-        default:
-        case XFRM_POLICY_IN:
-                return FLOW_DIR_IN;
-        case XFRM_POLICY_OUT:
-                return FLOW_DIR_OUT;
-        case XFRM_POLICY_FWD:
-                return FLOW_DIR_FWD;
-        };
-}
 
 static int stale_bundle(struct dst_entry *dst);
 
@@ -769,19 +785,20 @@ int xfrm_lookup(struct dst_entry **dst_p, struct flowi *fl,
         int err;
         u32 genid;
         u16 family = dst_orig->ops->family;
+        u8 dir = policy_to_flow_dir(XFRM_POLICY_OUT);
+        u32 sk_sid = security_sk_sid(sk, fl, dir);
 restart:
         genid = atomic_read(&flow_cache_genid);
         policy = NULL;
         if (sk && sk->sk_policy[1])
-                policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl);
+                policy = xfrm_sk_policy_lookup(sk, XFRM_POLICY_OUT, fl, sk_sid);
 
         if (!policy) {
                 /* To accelerate a bit...  */
                 if ((dst_orig->flags & DST_NOXFRM) || !xfrm_policy_list[XFRM_POLICY_OUT])
                         return 0;
 
-                policy = flow_cache_lookup(fl, family,
-                                           policy_to_flow_dir(XFRM_POLICY_OUT),
+                policy = flow_cache_lookup(fl, sk_sid, family, dir,
                                            xfrm_policy_lookup);
         }
 
@@ -962,16 +979,20 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
 {
         struct xfrm_policy *pol;
         struct flowi fl;
+        u8 fl_dir = policy_to_flow_dir(dir);
+        u32 sk_sid;
 
         if (_decode_session(skb, &fl, family) < 0)
                 return 0;
 
+        sk_sid = security_sk_sid(sk, &fl, fl_dir);
+
         /* First, check used SA against their selectors. */
         if (skb->sp) {
                 int i;
 
                 for (i=skb->sp->len-1; i>=0; i--) {
-                  struct sec_decap_state *xvec = &(skb->sp->x[i]);
+                        struct sec_decap_state *xvec = &(skb->sp->x[i]);
                         if (!xfrm_selector_match(&xvec->xvec->sel, &fl, family))
                                 return 0;
 
@@ -986,11 +1007,10 @@ int __xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb,
 
         pol = NULL;
         if (sk && sk->sk_policy[dir])
-                pol = xfrm_sk_policy_lookup(sk, dir, &fl);
+                pol = xfrm_sk_policy_lookup(sk, dir, &fl, sk_sid);
 
         if (!pol)
-                pol = flow_cache_lookup(&fl, family,
-                                        policy_to_flow_dir(dir),
+                pol = flow_cache_lookup(&fl, sk_sid, family, fl_dir,
                                         xfrm_policy_lookup);
 
         if (!pol)
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 479effc97666..e12d0be5f976 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -10,7 +10,7 @@
  *              Split up af-specific functions
  *      Derek Atkins <derek@ihtfp.com>
  *              Add UDP Encapsulation
- *      
+ *
  */
 
 #include <linux/workqueue.h>
@@ -70,6 +70,7 @@ static void xfrm_state_gc_destroy(struct xfrm_state *x)
                 x->type->destructor(x);
                 xfrm_put_type(x->type);
         }
+        security_xfrm_state_free(x);
         kfree(x);
 }
 
@@ -343,7 +344,8 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
                               selector.
                          */
                         if (x->km.state == XFRM_STATE_VALID) {
-                                if (!xfrm_selector_match(&x->sel, fl, family))
+                                if (!xfrm_selector_match(&x->sel, fl, family) ||
+                                    !xfrm_sec_ctx_match(pol->security, x->security))
                                         continue;
                                 if (!best ||
                                     best->km.dying > x->km.dying ||
@@ -354,7 +356,8 @@ xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
                                 acquire_in_progress = 1;
                         } else if (x->km.state == XFRM_STATE_ERROR ||
                                    x->km.state == XFRM_STATE_EXPIRED) {
-                                if (xfrm_selector_match(&x->sel, fl, family))
+                                if (xfrm_selector_match(&x->sel, fl, family) &&
+                                    xfrm_sec_ctx_match(pol->security, x->security))
                                         error = -ESRCH;
                         }
                 }
diff --git a/net/xfrm/xfrm_user.c b/net/xfrm/xfrm_user.c
index 0cdd9a07e043..92e2b804c606 100644
--- a/net/xfrm/xfrm_user.c
+++ b/net/xfrm/xfrm_user.c
@@ -7,7 +7,7 @@
  *      Kazunori MIYAZAWA @USAGI
  *      Kunihiro Ishiguro <kunihiro@ipinfusion.com>
  *              IPv6 support
- *      
+ *
  */
 
 #include <linux/module.h>
@@ -88,6 +88,34 @@ static int verify_encap_tmpl(struct rtattr **xfrma)
         return 0;
 }
 
+
+static inline int verify_sec_ctx_len(struct rtattr **xfrma)
+{
+        struct rtattr *rt = xfrma[XFRMA_SEC_CTX - 1];
+        struct xfrm_user_sec_ctx *uctx;
+        int len = 0;
+
+        if (!rt)
+                return 0;
+
+        if (rt->rta_len < sizeof(*uctx))
+                return -EINVAL;
+
+        uctx = RTA_DATA(rt);
+
+        if (uctx->ctx_len > PAGE_SIZE)
+                return -EINVAL;
+
+        len += sizeof(struct xfrm_user_sec_ctx);
+        len += uctx->ctx_len;
+
+        if (uctx->len != len)
+                return -EINVAL;
+
+        return 0;
+}
+
+
 static int verify_newsa_info(struct xfrm_usersa_info *p,
                              struct rtattr **xfrma)
 {
@@ -145,6 +173,8 @@ static int verify_newsa_info(struct xfrm_usersa_info *p,
                 goto out;
         if ((err = verify_encap_tmpl(xfrma)))
                 goto out;
+        if ((err = verify_sec_ctx_len(xfrma)))
+                goto out;
 
         err = -EINVAL;
         switch (p->mode) {
@@ -209,6 +239,30 @@ static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_a
         return 0;
 }
 
+
+static inline int xfrm_user_sec_ctx_size(struct xfrm_policy *xp)
+{
+        struct xfrm_sec_ctx *xfrm_ctx = xp->security;
+        int len = 0;
+
+        if (xfrm_ctx) {
+                len += sizeof(struct xfrm_user_sec_ctx);
+                len += xfrm_ctx->ctx_len;
+        }
+        return len;
+}
+
+static int attach_sec_ctx(struct xfrm_state *x, struct rtattr *u_arg)
+{
+        struct xfrm_user_sec_ctx *uctx;
+
+        if (!u_arg)
+                return 0;
+
+        uctx = RTA_DATA(u_arg);
+        return security_xfrm_state_alloc(x, uctx);
+}
+
 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
 {
         memcpy(&x->id, &p->id, sizeof(x->id));
@@ -253,6 +307,9 @@ static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
         if (err)
                 goto error;
 
+        if ((err = attach_sec_ctx(x, xfrma[XFRMA_SEC_CTX-1])))
+                goto error;
+
         x->km.seq = p->seq;
 
         return x;
@@ -272,11 +329,11 @@ static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
         int err;
         struct km_event c;
 
-        err = verify_newsa_info(p, (struct rtattr **) xfrma);
+        err = verify_newsa_info(p, (struct rtattr **)xfrma);
         if (err)
                 return err;
 
-        x = xfrm_state_construct(p, (struct rtattr **) xfrma, &err);
+        x = xfrm_state_construct(p, (struct rtattr **)xfrma, &err);
         if (!x)
                 return err;
 
@@ -390,6 +447,19 @@ static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
         if (x->encap)
                 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
 
+        if (x->security) {
+                int ctx_size = sizeof(struct xfrm_sec_ctx) +
+                                x->security->ctx_len;
+                struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
+                struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
+
+                uctx->exttype = XFRMA_SEC_CTX;
+                uctx->len = ctx_size;
+                uctx->ctx_doi = x->security->ctx_doi;
+                uctx->ctx_alg = x->security->ctx_alg;
+                uctx->ctx_len = x->security->ctx_len;
+                memcpy(uctx + 1, x->security->ctx_str, x->security->ctx_len);
+        }
         nlh->nlmsg_len = skb->tail - b;
 out:
         sp->this_idx++;
@@ -603,6 +673,18 @@ static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
         return verify_policy_dir(p->dir);
 }
 
+static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct rtattr **xfrma)
+{
+        struct rtattr *rt = xfrma[XFRMA_SEC_CTX-1];
+        struct xfrm_user_sec_ctx *uctx;
+
+        if (!rt)
+                return 0;
+
+        uctx = RTA_DATA(rt);
+        return security_xfrm_policy_alloc(pol, uctx);
+}
+
 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
                            int nr)
 {
@@ -681,7 +763,10 @@ static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p,
         }
 
         copy_from_user_policy(xp, p);
-        err = copy_from_user_tmpl(xp, xfrma);
+
+        if (!(err = copy_from_user_tmpl(xp, xfrma)))
+                err = copy_from_user_sec_ctx(xp, xfrma);
+
         if (err) {
                 *errp = err;
                 kfree(xp);
@@ -702,8 +787,11 @@ static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr
         err = verify_newpolicy_info(p);
         if (err)
                 return err;
+        err = verify_sec_ctx_len((struct rtattr **)xfrma);
+        if (err)
+                return err;
 
-        xp = xfrm_policy_construct(p, (struct rtattr **) xfrma, &err);
+        xp = xfrm_policy_construct(p, (struct rtattr **)xfrma, &err);
         if (!xp)
                 return err;
 
@@ -761,6 +849,27 @@ rtattr_failure:
         return -1;
 }
 
+static int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
+{
+        if (xp->security) {
+                int ctx_size = sizeof(struct xfrm_sec_ctx) +
+                                xp->security->ctx_len;
+                struct rtattr *rt = __RTA_PUT(skb, XFRMA_SEC_CTX, ctx_size);
+                struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
+
+                uctx->exttype = XFRMA_SEC_CTX;
+                uctx->len = ctx_size;
+                uctx->ctx_doi = xp->security->ctx_doi;
+                uctx->ctx_alg = xp->security->ctx_alg;
+                uctx->ctx_len = xp->security->ctx_len;
+                memcpy(uctx + 1, xp->security->ctx_str, xp->security->ctx_len);
+        }
+        return 0;
+
+ rtattr_failure:
+        return -1;
+}
+
 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
 {
         struct xfrm_dump_info *sp = ptr;
@@ -782,6 +891,8 @@ static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr
         copy_to_user_policy(xp, p, dir);
         if (copy_to_user_tmpl(xp, skb) < 0)
                 goto nlmsg_failure;
+        if (copy_to_user_sec_ctx(xp, skb))
+                goto nlmsg_failure;
 
         nlh->nlmsg_len = skb->tail - b;
 out:
@@ -852,8 +963,25 @@ static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfr
 
         if (p->index)
                 xp = xfrm_policy_byid(p->dir, p->index, delete);
-        else
-                xp = xfrm_policy_bysel(p->dir, &p->sel, delete);
+        else {
+                struct rtattr **rtattrs = (struct rtattr **)xfrma;
+                struct rtattr *rt = rtattrs[XFRMA_SEC_CTX-1];
+                struct xfrm_policy tmp;
+
+                err = verify_sec_ctx_len(rtattrs);
+                if (err)
+                        return err;
+
+                memset(&tmp, 0, sizeof(struct xfrm_policy));
+                if (rt) {
+                        struct xfrm_user_sec_ctx *uctx = RTA_DATA(rt);
+
+                        if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
+                                return err;
+                }
+                xp = xfrm_policy_bysel_ctx(p->dir, &p->sel, tmp.security, delete);
+                security_xfrm_policy_free(&tmp);
+        }
         if (xp == NULL)
                 return -ENOENT;
 
@@ -1224,6 +1352,8 @@ static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
 
         if (copy_to_user_tmpl(xp, skb) < 0)
                 goto nlmsg_failure;
+        if (copy_to_user_sec_ctx(xp, skb))
+                goto nlmsg_failure;
 
         nlh->nlmsg_len = skb->tail - b;
         return skb->len;
@@ -1241,6 +1371,7 @@ static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
 
         len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
         len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
+        len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
         skb = alloc_skb(len, GFP_ATOMIC);
         if (skb == NULL)
                 return -ENOMEM;
@@ -1324,6 +1455,8 @@ static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
         copy_to_user_policy(xp, &upe->pol, dir);
         if (copy_to_user_tmpl(xp, skb) < 0)
                 goto nlmsg_failure;
+        if (copy_to_user_sec_ctx(xp, skb))
+                goto nlmsg_failure;
         upe->hard = !!hard;
 
         nlh->nlmsg_len = skb->tail - b;
@@ -1341,6 +1474,7 @@ static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_eve
 
         len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
         len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
+        len += RTA_SPACE(xfrm_user_sec_ctx_size(xp));
         skb = alloc_skb(len, GFP_ATOMIC);
         if (skb == NULL)
                 return -ENOMEM;