5 files changed, 202 insertions, 6 deletions

diff --git a/include/linux/pfkeyv2.h b/include/linux/pfkeyv2.h
index 724066778aff..6351c4055ace 100644
--- a/include/linux/pfkeyv2.h
+++ b/include/linux/pfkeyv2.h
@@ -216,6 +216,16 @@ struct sadb_x_nat_t_port {
 } __attribute__((packed));
 /* sizeof(struct sadb_x_nat_t_port) == 8 */
 
+/* Generic LSM security context */
+struct sadb_x_sec_ctx {
+        uint16_t        sadb_x_sec_len;
+        uint16_t        sadb_x_sec_exttype;
+        uint8_t         sadb_x_ctx_alg;  /* LSMs: e.g., selinux == 1 */
+        uint8_t         sadb_x_ctx_doi;
+        uint16_t        sadb_x_ctx_len;
+} __attribute__((packed));
+/* sizeof(struct sadb_sec_ctx) = 8 */
+
 /* Message types */
 #define SADB_RESERVED           0
 #define SADB_GETSPI             1
@@ -325,7 +335,8 @@ struct sadb_x_nat_t_port {
 #define SADB_X_EXT_NAT_T_SPORT          21
 #define SADB_X_EXT_NAT_T_DPORT          22
 #define SADB_X_EXT_NAT_T_OA             23
-#define SADB_EXT_MAX                    23
+#define SADB_X_EXT_SEC_CTX              24
+#define SADB_EXT_MAX                    24
 
 /* Identity Extension values */
 #define SADB_IDENTTYPE_RESERVED 0
diff --git a/include/linux/security.h b/include/linux/security.h
index f7e0ae018712..ef753654daa5 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -59,6 +59,12 @@ struct sk_buff;
 struct sock;
 struct sockaddr;
 struct socket;
+struct flowi;
+struct dst_entry;
+struct xfrm_selector;
+struct xfrm_policy;
+struct xfrm_state;
+struct xfrm_user_sec_ctx;
 
 extern int cap_netlink_send(struct sock *sk, struct sk_buff *skb);
 extern int cap_netlink_recv(struct sk_buff *skb);
@@ -788,6 +794,52 @@ struct swap_info_struct;
  *      which is used to copy security attributes between local stream sockets.
  * @sk_free_security:
  *      Deallocate security structure.
+ * @sk_getsid:
+ *      Retrieve the LSM-specific sid for the sock to enable caching of network
+ *      authorizations.
+ *
+ * Security hooks for XFRM operations.
+ *
+ * @xfrm_policy_alloc_security:
+ *      @xp contains the xfrm_policy being added to Security Policy Database
+ *      used by the XFRM system.
+ *      @sec_ctx contains the security context information being provided by
+ *      the user-level policy update program (e.g., setkey).
+ *      Allocate a security structure to the xp->selector.security field.
+ *      The security field is initialized to NULL when the xfrm_policy is
+ *      allocated.
+ *      Return 0 if operation was successful (memory to allocate, legal context)
+ * @xfrm_policy_clone_security:
+ *      @old contains an existing xfrm_policy in the SPD.
+ *      @new contains a new xfrm_policy being cloned from old.
+ *      Allocate a security structure to the new->selector.security field
+ *      that contains the information from the old->selector.security field.
+ *      Return 0 if operation was successful (memory to allocate).
+ * @xfrm_policy_free_security:
+ *      @xp contains the xfrm_policy
+ *      Deallocate xp->selector.security.
+ * @xfrm_state_alloc_security:
+ *      @x contains the xfrm_state being added to the Security Association
+ *      Database by the XFRM system.
+ *      @sec_ctx contains the security context information being provided by
+ *      the user-level SA generation program (e.g., setkey or racoon).
+ *      Allocate a security structure to the x->sel.security field.  The
+ *      security field is initialized to NULL when the xfrm_state is
+ *      allocated.
+ *      Return 0 if operation was successful (memory to allocate, legal context).
+ * @xfrm_state_free_security:
+ *      @x contains the xfrm_state.
+ *      Deallocate x>sel.security.
+ * @xfrm_policy_lookup:
+ *      @xp contains the xfrm_policy for which the access control is being
+ *      checked.
+ *      @sk_sid contains the sock security label that is used to authorize
+ *      access to the policy xp.
+ *      @dir contains the direction of the flow (input or output).
+ *      Check permission when a sock selects a xfrm_policy for processing
+ *      XFRMs on a packet.  The hook is called when selecting either a
+ *      per-socket policy or a generic xfrm policy.
+ *      Return 0 if permission is granted.
  *
  * Security hooks affecting all Key Management operations
  *
@@ -1237,8 +1289,18 @@ struct security_operations {
         int (*socket_getpeersec) (struct socket *sock, char __user *optval, int __user *optlen, unsigned len);
         int (*sk_alloc_security) (struct sock *sk, int family, gfp_t priority);
         void (*sk_free_security) (struct sock *sk);
+        unsigned int (*sk_getsid) (struct sock *sk, struct flowi *fl, u8 dir);
 #endif  /* CONFIG_SECURITY_NETWORK */
 
+#ifdef CONFIG_SECURITY_NETWORK_XFRM
+        int (*xfrm_policy_alloc_security) (struct xfrm_policy *xp, struct xfrm_user_sec_ctx *sec_ctx);
+        int (*xfrm_policy_clone_security) (struct xfrm_policy *old, struct xfrm_policy *new);
+        void (*xfrm_policy_free_security) (struct xfrm_policy *xp);
+        int (*xfrm_state_alloc_security) (struct xfrm_state *x, struct xfrm_user_sec_ctx *sec_ctx);
+        void (*xfrm_state_free_security) (struct xfrm_state *x);
+        int (*xfrm_policy_lookup)(struct xfrm_policy *xp, u32 sk_sid, u8 dir);
+#endif  /* CONFIG_SECURITY_NETWORK_XFRM */
+
         /* key management security hooks */
 #ifdef CONFIG_KEYS
         int (*key_alloc)(struct key *key);
@@ -2679,6 +2741,11 @@ static inline void security_sk_free(struct sock *sk)
 {
         return security_ops->sk_free_security(sk);
 }
+
+static inline unsigned int security_sk_sid(struct sock *sk, struct flowi *fl, u8 dir)
+{
+        return security_ops->sk_getsid(sk, fl, dir);
+}
 #else   /* CONFIG_SECURITY_NETWORK */
 static inline int security_unix_stream_connect(struct socket * sock,
                                                struct socket * other, 
@@ -2795,8 +2862,73 @@ static inline int security_sk_alloc(struct sock *sk, int family, gfp_t priority)
 static inline void security_sk_free(struct sock *sk)
 {
 }
+
+static inline unsigned int security_sk_sid(struct sock *sk, struct flowi *fl, u8 dir)
+{
+        return 0;
+}
 #endif  /* CONFIG_SECURITY_NETWORK */
 
+#ifdef CONFIG_SECURITY_NETWORK_XFRM
+static inline int security_xfrm_policy_alloc(struct xfrm_policy *xp, struct xfrm_user_sec_ctx *sec_ctx)
+{
+        return security_ops->xfrm_policy_alloc_security(xp, sec_ctx);
+}
+
+static inline int security_xfrm_policy_clone(struct xfrm_policy *old, struct xfrm_policy *new)
+{
+        return security_ops->xfrm_policy_clone_security(old, new);
+}
+
+static inline void security_xfrm_policy_free(struct xfrm_policy *xp)
+{
+        security_ops->xfrm_policy_free_security(xp);
+}
+
+static inline int security_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *sec_ctx)
+{
+        return security_ops->xfrm_state_alloc_security(x, sec_ctx);
+}
+
+static inline void security_xfrm_state_free(struct xfrm_state *x)
+{
+        security_ops->xfrm_state_free_security(x);
+}
+
+static inline int security_xfrm_policy_lookup(struct xfrm_policy *xp, u32 sk_sid, u8 dir)
+{
+        return security_ops->xfrm_policy_lookup(xp, sk_sid, dir);
+}
+#else   /* CONFIG_SECURITY_NETWORK_XFRM */
+static inline int security_xfrm_policy_alloc(struct xfrm_policy *xp, struct xfrm_user_sec_ctx *sec_ctx)
+{
+        return 0;
+}
+
+static inline int security_xfrm_policy_clone(struct xfrm_policy *old, struct xfrm_policy *new)
+{
+        return 0;
+}
+
+static inline void security_xfrm_policy_free(struct xfrm_policy *xp)
+{
+}
+
+static inline int security_xfrm_state_alloc(struct xfrm_state *x, struct xfrm_user_sec_ctx *sec_ctx)
+{
+        return 0;
+}
+
+static inline void security_xfrm_state_free(struct xfrm_state *x)
+{
+}
+
+static inline int security_xfrm_policy_lookup(struct xfrm_policy *xp, u32 sk_sid, u8 dir)
+{
+        return 0;
+}
+#endif  /* CONFIG_SECURITY_NETWORK_XFRM */
+
 #ifdef CONFIG_KEYS
 #ifdef CONFIG_SECURITY
 static inline int security_key_alloc(struct key *key)
diff --git a/include/linux/xfrm.h b/include/linux/xfrm.h
index 0fb077d68441..82fbb758e28f 100644
--- a/include/linux/xfrm.h
+++ b/include/linux/xfrm.h
@@ -27,6 +27,22 @@ struct xfrm_id
         __u8            proto;
 };
 
+struct xfrm_sec_ctx {
+        __u8    ctx_doi;
+        __u8    ctx_alg;
+        __u16   ctx_len;
+        __u32   ctx_sid;
+        char    ctx_str[0];
+};
+
+/* Security Context Domains of Interpretation */
+#define XFRM_SC_DOI_RESERVED 0
+#define XFRM_SC_DOI_LSM 1
+
+/* Security Context Algorithms */
+#define XFRM_SC_ALG_RESERVED 0
+#define XFRM_SC_ALG_SELINUX 1
+
 /* Selector, used as selector both on policy rules (SPD) and SAs. */
 
 struct xfrm_selector
@@ -146,6 +162,18 @@ enum {
 
 #define XFRM_NR_MSGTYPES (XFRM_MSG_MAX + 1 - XFRM_MSG_BASE)
 
+/*
+ * Generic LSM security context for comunicating to user space
+ * NOTE: Same format as sadb_x_sec_ctx
+ */
+struct xfrm_user_sec_ctx {
+        __u16                   len;
+        __u16                   exttype;
+        __u8                    ctx_alg;  /* LSMs: e.g., selinux == 1 */
+        __u8                    ctx_doi;
+        __u16                   ctx_len;
+};
+
 struct xfrm_user_tmpl {
         struct xfrm_id          id;
         __u16                   family;
@@ -176,6 +204,7 @@ enum xfrm_attr_type_t {
         XFRMA_TMPL,             /* 1 or more struct xfrm_user_tmpl */
         XFRMA_SA,
         XFRMA_POLICY,
+        XFRMA_SEC_CTX,          /* struct xfrm_sec_ctx */
         __XFRMA_MAX
 
 #define XFRMA_MAX (__XFRMA_MAX - 1)
diff --git a/include/net/flow.h b/include/net/flow.h
index 9a5c94b1a0ec..ec7eb86eb203 100644
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -84,11 +84,12 @@ struct flowi {
 #define FLOW_DIR_OUT    1
 #define FLOW_DIR_FWD    2
 
-typedef void (*flow_resolve_t)(struct flowi *key, u16 family, u8 dir,
+struct sock;
+typedef void (*flow_resolve_t)(struct flowi *key, u32 sk_sid, u16 family, u8 dir,
                                void **objp, atomic_t **obj_refp);
 
-extern void *flow_cache_lookup(struct flowi *key, u16 family, u8 dir,
-                               flow_resolve_t resolver);
+extern void *flow_cache_lookup(struct flowi *key, u32 sk_sid, u16 family, u8 dir,
+                               flow_resolve_t resolver);
 extern void flow_cache_flush(void);
 extern atomic_t flow_cache_genid;
 
diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 1cdb87912137..487abca3ca6f 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -144,6 +144,9 @@ struct xfrm_state
          * transformer. */
         struct xfrm_type        *type;
 
+        /* Security context */
+        struct xfrm_sec_ctx     *security;
+
         /* Private data of this transformer, format is opaque,
          * interpreted by xfrm_type methods. */
         void                    *data;
@@ -298,6 +301,7 @@ struct xfrm_policy
         __u8                    flags;
         __u8                    dead;
         __u8                    xfrm_nr;
+        struct xfrm_sec_ctx     *security;
         struct xfrm_tmpl        xfrm_vec[XFRM_MAX_DEPTH];
 };
 
@@ -510,6 +514,25 @@ xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
         return 0;
 }
 
+#ifdef CONFIG_SECURITY_NETWORK_XFRM
+/*      If neither has a context --> match
+ *      Otherwise, both must have a context and the sids, doi, alg must match
+ */
+static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
+{
+        return ((!s1 && !s2) ||
+                (s1 && s2 &&
+                 (s1->ctx_sid == s2->ctx_sid) &&
+                 (s1->ctx_doi == s2->ctx_doi) &&
+                 (s1->ctx_alg == s2->ctx_alg)));
+}
+#else
+static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
+{
+        return 1;
+}
+#endif
+
 /* A struct encoding bundle of transformations to apply to some set of flow.
  *
  * dst->child points to the next element of bundle.
@@ -878,8 +901,8 @@ static inline int xfrm_dst_lookup(struct xfrm_dst **dst, struct flowi *fl, unsig
 struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
 extern int xfrm_policy_walk(int (*func)(struct xfrm_policy *, int, int, void*), void *);
 int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
-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 *xfrm_policy_byid(int dir, u32 id, int delete);
 void xfrm_policy_flush(void);
 u32 xfrm_get_acqseq(void);