netlabel: Label incoming TCP connections correctly in SELinux

The current NetLabel/SELinux behavior for incoming TCP connections works but
only through a series of happy coincidences that rely on the limited nature of
standard CIPSO (only able to convey MLS attributes) and the write equality
imposed by the SELinux MLS constraints.  The problem is that network sockets
created as the result of an incoming TCP connection were not on-the-wire
labeled based on the security attributes of the parent socket but rather based
on the wire label of the remote peer.  The issue had to do with how IP options
were managed as part of the network stack and where the LSM hooks were in
relation to the code which set the IP options on these newly created child
sockets.  While NetLabel/SELinux did correctly set the socket's on-the-wire
label it was promptly cleared by the network stack and reset based on the IP
options of the remote peer.

This patch, in conjunction with a prior patch that adjusted the LSM hook
locations, works to set the correct on-the-wire label format for new incoming
connections through the security_inet_conn_request() hook.  Besides the
correct behavior there are many advantages to this change, the most significant
is that all of the NetLabel socket labeling code in SELinux now lives in hooks
which can return error codes to the core stack which allows us to finally get
ride of the selinux_netlbl_inode_permission() logic which greatly simplfies
the NetLabel/SELinux glue code.  In the process of developing this patch I
also ran into a small handful of AF_INET6 cleanliness issues that have been
fixed which should make the code safer and easier to extend in the future.

Signed-off-by: Paul Moore <paul.moore@hp.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Signed-off-by: James Morris <jmorris@namei.org>

1 files changed, 15 insertions, 39 deletions

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 7c52ba243c64..ee2e781d11d7 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -311,7 +311,7 @@ static int sk_alloc_security(struct sock *sk, int family, gfp_t priority)
         ssec->sid = SECINITSID_UNLABELED;
         sk->sk_security = ssec;
 
-        selinux_netlbl_sk_security_reset(ssec, family);
+        selinux_netlbl_sk_security_reset(ssec);
 
         return 0;
 }
@@ -2945,7 +2945,6 @@ static void selinux_inode_getsecid(const struct inode *inode, u32 *secid)
 static int selinux_revalidate_file_permission(struct file *file, int mask)
 {
         const struct cred *cred = current_cred();
-        int rc;
         struct inode *inode = file->f_path.dentry->d_inode;
 
         if (!mask) {
@@ -2957,29 +2956,15 @@ static int selinux_revalidate_file_permission(struct file *file, int mask)
         if ((file->f_flags & O_APPEND) && (mask & MAY_WRITE))
                 mask |= MAY_APPEND;
 
-        rc = file_has_perm(cred, file,
-                           file_mask_to_av(inode->i_mode, mask));
-        if (rc)
-                return rc;
-
-        return selinux_netlbl_inode_permission(inode, mask);
+        return file_has_perm(cred, file,
+                             file_mask_to_av(inode->i_mode, mask));
 }
 
 static int selinux_file_permission(struct file *file, int mask)
 {
-        struct inode *inode = file->f_path.dentry->d_inode;
-        struct file_security_struct *fsec = file->f_security;
-        struct inode_security_struct *isec = inode->i_security;
-        u32 sid = current_sid();
-
-        if (!mask) {
+        if (!mask)
                 /* No permission to check.  Existence test. */
                 return 0;
-        }
-
-        if (sid == fsec->sid && fsec->isid == isec->sid
-            && fsec->pseqno == avc_policy_seqno())
-                return selinux_netlbl_inode_permission(inode, mask);
 
         return selinux_revalidate_file_permission(file, mask);
 }
@@ -3723,7 +3708,7 @@ static int selinux_socket_post_create(struct socket *sock, int family,
                 sksec = sock->sk->sk_security;
                 sksec->sid = isec->sid;
                 sksec->sclass = isec->sclass;
-                err = selinux_netlbl_socket_post_create(sock);
+                err = selinux_netlbl_socket_post_create(sock->sk, family);
         }
 
         return err;
@@ -3914,13 +3899,7 @@ static int selinux_socket_accept(struct socket *sock, struct socket *newsock)
 static int selinux_socket_sendmsg(struct socket *sock, struct msghdr *msg,
                                   int size)
 {
-        int rc;
-
-        rc = socket_has_perm(current, sock, SOCKET__WRITE);
-        if (rc)
-                return rc;
-
-        return selinux_netlbl_inode_permission(SOCK_INODE(sock), MAY_WRITE);
+        return socket_has_perm(current, sock, SOCKET__WRITE);
 }
 
 static int selinux_socket_recvmsg(struct socket *sock, struct msghdr *msg,
@@ -4304,7 +4283,7 @@ static void selinux_sk_clone_security(const struct sock *sk, struct sock *newsk)
         newssec->peer_sid = ssec->peer_sid;
         newssec->sclass = ssec->sclass;
 
-        selinux_netlbl_sk_security_reset(newssec, newsk->sk_family);
+        selinux_netlbl_sk_security_reset(newssec);
 }
 
 static void selinux_sk_getsecid(struct sock *sk, u32 *secid)
@@ -4348,16 +4327,15 @@ static int selinux_inet_conn_request(struct sock *sk, struct sk_buff *skb,
         if (peersid == SECSID_NULL) {
                 req->secid = sksec->sid;
                 req->peer_secid = SECSID_NULL;
-                return 0;
+        } else {
+                err = security_sid_mls_copy(sksec->sid, peersid, &newsid);
+                if (err)
+                        return err;
+                req->secid = newsid;
+                req->peer_secid = peersid;
         }
 
-        err = security_sid_mls_copy(sksec->sid, peersid, &newsid);
-        if (err)
-                return err;
-
-        req->secid = newsid;
-        req->peer_secid = peersid;
-        return 0;
+        return selinux_netlbl_inet_conn_request(req, family);
 }
 
 static void selinux_inet_csk_clone(struct sock *newsk,
@@ -4374,7 +4352,7 @@ static void selinux_inet_csk_clone(struct sock *newsk,
 
         /* We don't need to take any sort of lock here as we are the only
          * thread with access to newsksec */
-        selinux_netlbl_sk_security_reset(newsksec, req->rsk_ops->family);
+        selinux_netlbl_inet_csk_clone(newsk, req->rsk_ops->family);
 }
 
 static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
@@ -4387,8 +4365,6 @@ static void selinux_inet_conn_established(struct sock *sk, struct sk_buff *skb)
                 family = PF_INET;
 
         selinux_skb_peerlbl_sid(skb, family, &sksec->peer_sid);
-
-        selinux_netlbl_inet_conn_established(sk, family);
 }
 
 static void selinux_req_classify_flow(const struct request_sock *req,