security: Add support for SCTP security hooks

The SCTP security hooks are explained in:
Documentation/security/LSM-sctp.rst

Signed-off-by: Richard Haines <richard_c_haines@btinternet.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>

2 files changed, 61 insertions, 0 deletions

diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 7161d8e7ee79..84c0b927ea85 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -906,6 +906,33 @@
  *      associated with the TUN device's security structure.
  *      @security pointer to the TUN devices's security structure.
  *
+ * Security hooks for SCTP
+ *
+ * @sctp_assoc_request:
+ *      Passes the @ep and @chunk->skb of the association INIT packet to
+ *      the security module.
+ *      @ep pointer to sctp endpoint structure.
+ *      @skb pointer to skbuff of association packet.
+ *      Return 0 on success, error on failure.
+ * @sctp_bind_connect:
+ *      Validiate permissions required for each address associated with sock
+ *      @sk. Depending on @optname, the addresses will be treated as either
+ *      for a connect or bind service. The @addrlen is calculated on each
+ *      ipv4 and ipv6 address using sizeof(struct sockaddr_in) or
+ *      sizeof(struct sockaddr_in6).
+ *      @sk pointer to sock structure.
+ *      @optname name of the option to validate.
+ *      @address list containing one or more ipv4/ipv6 addresses.
+ *      @addrlen total length of address(s).
+ *      Return 0 on success, error on failure.
+ * @sctp_sk_clone:
+ *      Called whenever a new socket is created by accept(2) (i.e. a TCP
+ *      style socket) or when a socket is 'peeled off' e.g userspace
+ *      calls sctp_peeloff(3).
+ *      @ep pointer to current sctp endpoint structure.
+ *      @sk pointer to current sock structure.
+ *      @sk pointer to new sock structure.
+ *
  * Security hooks for Infiniband
  *
  * @ib_pkey_access:
@@ -1665,6 +1692,12 @@ union security_list_options {
         int (*tun_dev_attach_queue)(void *security);
         int (*tun_dev_attach)(struct sock *sk, void *security);
         int (*tun_dev_open)(void *security);
+        int (*sctp_assoc_request)(struct sctp_endpoint *ep,
+                                  struct sk_buff *skb);
+        int (*sctp_bind_connect)(struct sock *sk, int optname,
+                                 struct sockaddr *address, int addrlen);
+        void (*sctp_sk_clone)(struct sctp_endpoint *ep, struct sock *sk,
+                              struct sock *newsk);
 #endif  /* CONFIG_SECURITY_NETWORK */
 
 #ifdef CONFIG_SECURITY_INFINIBAND
@@ -1914,6 +1947,9 @@ struct security_hook_heads {
         struct list_head tun_dev_attach_queue;
         struct list_head tun_dev_attach;
         struct list_head tun_dev_open;
+        struct list_head sctp_assoc_request;
+        struct list_head sctp_bind_connect;
+        struct list_head sctp_sk_clone;
 #endif  /* CONFIG_SECURITY_NETWORK */
 #ifdef CONFIG_SECURITY_INFINIBAND
         struct list_head ib_pkey_access;
diff --git a/include/linux/security.h b/include/linux/security.h
index 73f1ef625d40..2ff5f5777a53 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -115,6 +115,7 @@ struct xfrm_policy;
 struct xfrm_state;
 struct xfrm_user_sec_ctx;
 struct seq_file;
+struct sctp_endpoint;
 
 #ifdef CONFIG_MMU
 extern unsigned long mmap_min_addr;
@@ -1229,6 +1230,11 @@ int security_tun_dev_create(void);
 int security_tun_dev_attach_queue(void *security);
 int security_tun_dev_attach(struct sock *sk, void *security);
 int security_tun_dev_open(void *security);
+int security_sctp_assoc_request(struct sctp_endpoint *ep, struct sk_buff *skb);
+int security_sctp_bind_connect(struct sock *sk, int optname,
+                               struct sockaddr *address, int addrlen);
+void security_sctp_sk_clone(struct sctp_endpoint *ep, struct sock *sk,
+                            struct sock *newsk);
 
 #else   /* CONFIG_SECURITY_NETWORK */
 static inline int security_unix_stream_connect(struct sock *sock,
@@ -1421,6 +1427,25 @@ static inline int security_tun_dev_open(void *security)
 {
         return 0;
 }
+
+static inline int security_sctp_assoc_request(struct sctp_endpoint *ep,
+                                              struct sk_buff *skb)
+{
+        return 0;
+}
+
+static inline int security_sctp_bind_connect(struct sock *sk, int optname,
+                                             struct sockaddr *address,
+                                             int addrlen)
+{
+        return 0;
+}
+
+static inline void security_sctp_sk_clone(struct sctp_endpoint *ep,
+                                          struct sock *sk,
+                                          struct sock *newsk)
+{
+}
 #endif  /* CONFIG_SECURITY_NETWORK */
 
 #ifdef CONFIG_SECURITY_INFINIBAND