NetLabel: Add IP address family information to the netlbl_skbuff_getattr() function

In order to do any sort of IP header inspection of incoming packets we need to
know which address family, AF_INET/AF_INET6/etc., it belongs to and since the
sk_buff structure does not store this information we need to pass along the
address family separate from the packet itself.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Signed-off-by: James Morris <jmorris@namei.org>

diff --git a/include/net/netlabel.h b/include/net/netlabel.h
index 18b73cf..a3bffb4 100644 (file)
--- a/include/net/netlabel.h
+++ b/include/net/netlabel.h
@@ -363,6 +363,7 @@ int netlbl_sock_setattr(struct sock *sk,
 int netlbl_sock_getattr(struct sock *sk,
                        struct netlbl_lsm_secattr *secattr);
 int netlbl_skbuff_getattr(const struct sk_buff *skb,
+                         u16 family,
                          struct netlbl_lsm_secattr *secattr);
 void netlbl_skbuff_err(struct sk_buff *skb, int error);
 
@@ -415,6 +416,7 @@ static inline int netlbl_sock_getattr(struct sock *sk,
        return -ENOSYS;
 }
 static inline int netlbl_skbuff_getattr(const struct sk_buff *skb,
+                                       u16 family,
                                        struct netlbl_lsm_secattr *secattr)
 {
        return -ENOSYS;

diff --git a/net/netlabel/netlabel_kapi.c b/net/netlabel/netlabel_kapi.c
index d3762ea..4914615 100644 (file)
--- a/net/netlabel/netlabel_kapi.c
+++ b/net/netlabel/netlabel_kapi.c
@@ -332,6 +332,7 @@ int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
 /**
  * netlbl_skbuff_getattr - Determine the security attributes of a packet
  * @skb: the packet
+ * @family: protocol family
  * @secattr: the security attributes
  *
  * Description:
@@ -342,6 +343,7 @@ int netlbl_sock_getattr(struct sock *sk, struct netlbl_lsm_secattr *secattr)
  *
  */
 int netlbl_skbuff_getattr(const struct sk_buff *skb,
+                         u16 family,
                          struct netlbl_lsm_secattr *secattr)
 {
        if (CIPSO_V4_OPTEXIST(skb) &&

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 64d414e..5df1207 100644 (file)
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3429,6 +3429,7 @@ static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
 /**
  * selinux_skb_extlbl_sid - Determine the external label of a packet
  * @skb: the packet
+ * @family: protocol family
  * @sid: the packet's SID
  *
  * Description:
@@ -3441,13 +3442,16 @@ static int selinux_parse_skb(struct sk_buff *skb, struct avc_audit_data *ad,
  * selinux_netlbl_skbuff_getsid().
  *
  */
-static void selinux_skb_extlbl_sid(struct sk_buff *skb, u32 *sid)
+static void selinux_skb_extlbl_sid(struct sk_buff *skb,
+                                  u16 family,
+                                  u32 *sid)
 {
        u32 xfrm_sid;
        u32 nlbl_sid;
 
        selinux_skb_xfrm_sid(skb, &xfrm_sid);
        if (selinux_netlbl_skbuff_getsid(skb,
+                                        family,
                                         (xfrm_sid == SECSID_NULL ?
                                          SECINITSID_NETMSG : xfrm_sid),
                                         &nlbl_sid) != 0)
@@ -3940,7 +3944,7 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
        if (err)
                goto out;
 
-       err = selinux_netlbl_sock_rcv_skb(sksec, skb, &ad);
+       err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
        if (err)
                goto out;
 
@@ -3996,18 +4000,25 @@ out:
 static int selinux_socket_getpeersec_dgram(struct socket *sock, struct sk_buff *skb, u32 *secid)
 {
        u32 peer_secid = SECSID_NULL;
-       int err = 0;
+       u16 family;
 
-       if (sock && sock->sk->sk_family == PF_UNIX)
+       if (sock)
+               family = sock->sk->sk_family;
+       else if (skb && skb->sk)
+               family = skb->sk->sk_family;
+       else
+               goto out;
+
+       if (sock && family == PF_UNIX)
                selinux_get_inode_sid(SOCK_INODE(sock), &peer_secid);
        else if (skb)
-               selinux_skb_extlbl_sid(skb, &peer_secid);
+               selinux_skb_extlbl_sid(skb, family, &peer_secid);
 
-       if (peer_secid == SECSID_NULL)
-               err = -EINVAL;
+out:
        *secid = peer_secid;
-
-       return err;
+       if (peer_secid == SECSID_NULL)
+               return -EINVAL;
+       return 0;
 }
 
 static int selinux_sk_alloc_security(struct sock *sk, int family, gfp_t priority)
@@ -4062,7 +4073,7 @@ static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
        u32 newsid;
        u32 peersid;
 
-       selinux_skb_extlbl_sid(skb, &peersid);
+       selinux_skb_extlbl_sid(skb, sk->sk_family, &peersid);
        if (peersid == SECSID_NULL) {
                req->secid = sksec->sid;
                req->peer_secid = SECSID_NULL;
@@ -4100,7 +4111,7 @@ static void selinux_inet_conn_established(struct sock *sk,
 {
        struct sk_security_struct *sksec = sk->sk_security;
 
-       selinux_skb_extlbl_sid(skb, &sksec->peer_sid);
+       selinux_skb_extlbl_sid(skb, sk->sk_family, &sksec->peer_sid);
 }
 
 static void selinux_req_classify_flow(const struct request_sock *req,

diff --git a/security/selinux/include/netlabel.h b/security/selinux/include/netlabel.h
index 218e3f7..272769a 100644 (file)
--- a/security/selinux/include/netlabel.h
+++ b/security/selinux/include/netlabel.h
@@ -46,13 +46,17 @@ void selinux_netlbl_sk_security_init(struct sk_security_struct *ssec,
 void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec,
                                      struct sk_security_struct *newssec);
 
-int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid);
+int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
+                                u16 family,
+                                u32 base_sid,
+                                u32 *sid);
 
 void selinux_netlbl_sock_graft(struct sock *sk, struct socket *sock);
 int selinux_netlbl_socket_post_create(struct socket *sock);
 int selinux_netlbl_inode_permission(struct inode *inode, int mask);
 int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
                                struct sk_buff *skb,
+                               u16 family,
                                struct avc_audit_data *ad);
 int selinux_netlbl_socket_setsockopt(struct socket *sock,
                                     int level,
@@ -83,6 +87,7 @@ static inline void selinux_netlbl_sk_security_clone(
 }
 
 static inline int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
+                                              u16 family,
                                               u32 base_sid,
                                               u32 *sid)
 {
@@ -106,6 +111,7 @@ static inline int selinux_netlbl_inode_permission(struct inode *inode,
 }
 static inline int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
                                              struct sk_buff *skb,
+                                             u16 family,
                                              struct avc_audit_data *ad)
 {
        return 0;

diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c
index 66e013d..f4bcbf1 100644 (file)
--- a/security/selinux/netlabel.c
+++ b/security/selinux/netlabel.c
@@ -144,6 +144,7 @@ void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec,
 /**
  * selinux_netlbl_skbuff_getsid - Get the sid of a packet using NetLabel
  * @skb: the packet
+ * @family: protocol family
  * @base_sid: the SELinux SID to use as a context for MLS only attributes
  * @sid: the SID
  *
@@ -153,7 +154,10 @@ void selinux_netlbl_sk_security_clone(struct sk_security_struct *ssec,
  * assign to the packet.  Returns zero on success, negative values on failure.
  *
  */
-int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid)
+int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
+                                u16 family,
+                                u32 base_sid,
+                                u32 *sid)
 {
        int rc;
        struct netlbl_lsm_secattr secattr;
@@ -164,7 +168,7 @@ int selinux_netlbl_skbuff_getsid(struct sk_buff *skb, u32 base_sid, u32 *sid)
        }
 
        netlbl_secattr_init(&secattr);
-       rc = netlbl_skbuff_getattr(skb, &secattr);
+       rc = netlbl_skbuff_getattr(skb, family, &secattr);
        if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) {
                rc = security_netlbl_secattr_to_sid(&secattr, base_sid, sid);
                if (rc == 0 &&
@@ -292,6 +296,7 @@ int selinux_netlbl_inode_permission(struct inode *inode, int mask)
  * selinux_netlbl_sock_rcv_skb - Do an inbound access check using NetLabel
  * @sksec: the sock's sk_security_struct
  * @skb: the packet
+ * @family: protocol family
  * @ad: the audit data
  *
  * Description:
@@ -302,6 +307,7 @@ int selinux_netlbl_inode_permission(struct inode *inode, int mask)
  */
 int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
                                struct sk_buff *skb,
+                               u16 family,
                                struct avc_audit_data *ad)
 {
        int rc;
@@ -313,7 +319,7 @@ int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
                return 0;
 
        netlbl_secattr_init(&secattr);
-       rc = netlbl_skbuff_getattr(skb, &secattr);
+       rc = netlbl_skbuff_getattr(skb, family, &secattr);
        if (rc == 0 && secattr.flags != NETLBL_SECATTR_NONE) {
                rc = security_netlbl_secattr_to_sid(&secattr,
                                                    SECINITSID_NETMSG,