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Diffstat (limited to 'security/selinux/netlabel.c')
-rw-r--r--security/selinux/netlabel.c186
1 files changed, 53 insertions, 133 deletions
diff --git a/security/selinux/netlabel.c b/security/selinux/netlabel.c
index 350794ab9b4..2e984413c7b 100644
--- a/security/selinux/netlabel.c
+++ b/security/selinux/netlabel.c
@@ -100,41 +100,6 @@ static struct netlbl_lsm_secattr *selinux_netlbl_sock_genattr(struct sock *sk)
}
/**
- * selinux_netlbl_sock_setsid - Label a socket using the NetLabel mechanism
- * @sk: the socket to label
- *
- * Description:
- * Attempt to label a socket using the NetLabel mechanism. Returns zero values
- * on success, negative values on failure.
- *
- */
-static int selinux_netlbl_sock_setsid(struct sock *sk)
-{
- int rc;
- struct sk_security_struct *sksec = sk->sk_security;
- struct netlbl_lsm_secattr *secattr;
-
- if (sksec->nlbl_state != NLBL_REQUIRE)
- return 0;
-
- secattr = selinux_netlbl_sock_genattr(sk);
- if (secattr == NULL)
- return -ENOMEM;
- rc = netlbl_sock_setattr(sk, secattr);
- switch (rc) {
- case 0:
- sksec->nlbl_state = NLBL_LABELED;
- break;
- case -EDESTADDRREQ:
- sksec->nlbl_state = NLBL_REQSKB;
- rc = 0;
- break;
- }
-
- return rc;
-}
-
-/**
* selinux_netlbl_cache_invalidate - Invalidate the NetLabel cache
*
* Description:
@@ -188,13 +153,9 @@ void selinux_netlbl_sk_security_free(struct sk_security_struct *ssec)
* The caller is responsibile for all the NetLabel sk_security_struct locking.
*
*/
-void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec,
- int family)
+void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec)
{
- if (family == PF_INET)
- ssec->nlbl_state = NLBL_REQUIRE;
- else
- ssec->nlbl_state = NLBL_UNSET;
+ ssec->nlbl_state = NLBL_UNSET;
}
/**
@@ -281,127 +242,86 @@ skbuff_setsid_return:
}
/**
- * selinux_netlbl_inet_conn_established - Netlabel the newly accepted connection
- * @sk: the new connection
+ * selinux_netlbl_inet_conn_request - Label an incoming stream connection
+ * @req: incoming connection request socket
*
* Description:
- * A new connection has been established on @sk so make sure it is labeled
- * correctly with the NetLabel susbsystem.
+ * A new incoming connection request is represented by @req, we need to label
+ * the new request_sock here and the stack will ensure the on-the-wire label
+ * will get preserved when a full sock is created once the connection handshake
+ * is complete. Returns zero on success, negative values on failure.
*
*/
-void selinux_netlbl_inet_conn_established(struct sock *sk, u16 family)
+int selinux_netlbl_inet_conn_request(struct request_sock *req, u16 family)
{
int rc;
- struct sk_security_struct *sksec = sk->sk_security;
- struct netlbl_lsm_secattr *secattr;
- struct inet_sock *sk_inet = inet_sk(sk);
- struct sockaddr_in addr;
-
- if (sksec->nlbl_state != NLBL_REQUIRE)
- return;
+ struct netlbl_lsm_secattr secattr;
- secattr = selinux_netlbl_sock_genattr(sk);
- if (secattr == NULL)
- return;
+ if (family != PF_INET)
+ return 0;
- rc = netlbl_sock_setattr(sk, secattr);
- switch (rc) {
- case 0:
- sksec->nlbl_state = NLBL_LABELED;
- break;
- case -EDESTADDRREQ:
- /* no PF_INET6 support yet because we don't support any IPv6
- * labeling protocols */
- if (family != PF_INET) {
- sksec->nlbl_state = NLBL_UNSET;
- return;
- }
-
- addr.sin_family = family;
- addr.sin_addr.s_addr = sk_inet->daddr;
- if (netlbl_conn_setattr(sk, (struct sockaddr *)&addr,
- secattr) != 0) {
- /* we failed to label the connected socket (could be
- * for a variety of reasons, the actual "why" isn't
- * important here) so we have to go to our backup plan,
- * labeling the packets individually in the netfilter
- * local output hook. this is okay but we need to
- * adjust the MSS of the connection to take into
- * account any labeling overhead, since we don't know
- * the exact overhead at this point we'll use the worst
- * case value which is 40 bytes for IPv4 */
- struct inet_connection_sock *sk_conn = inet_csk(sk);
- sk_conn->icsk_ext_hdr_len += 40 -
- (sk_inet->opt ? sk_inet->opt->optlen : 0);
- sk_conn->icsk_sync_mss(sk, sk_conn->icsk_pmtu_cookie);
-
- sksec->nlbl_state = NLBL_REQSKB;
- } else
- sksec->nlbl_state = NLBL_CONNLABELED;
- break;
- default:
- /* note that we are failing to label the socket which could be
- * a bad thing since it means traffic could leave the system
- * without the desired labeling, however, all is not lost as
- * we have a check in selinux_netlbl_inode_permission() to
- * pick up the pieces that we might drop here because we can't
- * return an error code */
- break;
- }
+ netlbl_secattr_init(&secattr);
+ rc = security_netlbl_sid_to_secattr(req->secid, &secattr);
+ if (rc != 0)
+ goto inet_conn_request_return;
+ rc = netlbl_req_setattr(req, &secattr);
+inet_conn_request_return:
+ netlbl_secattr_destroy(&secattr);
+ return rc;
}
/**
- * selinux_netlbl_socket_post_create - Label a socket using NetLabel
- * @sock: the socket to label
+ * selinux_netlbl_inet_csk_clone - Initialize the newly created sock
+ * @sk: the new sock
*
* Description:
- * Attempt to label a socket using the NetLabel mechanism using the given
- * SID. Returns zero values on success, negative values on failure.
+ * A new connection has been established using @sk, we've already labeled the
+ * socket via the request_sock struct in selinux_netlbl_inet_conn_request() but
+ * we need to set the NetLabel state here since we now have a sock structure.
*
*/
-int selinux_netlbl_socket_post_create(struct socket *sock)
+void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family)
{
- return selinux_netlbl_sock_setsid(sock->sk);
+ struct sk_security_struct *sksec = sk->sk_security;
+
+ if (family == PF_INET)
+ sksec->nlbl_state = NLBL_LABELED;
+ else
+ sksec->nlbl_state = NLBL_UNSET;
}
/**
- * selinux_netlbl_inode_permission - Verify the socket is NetLabel labeled
- * @inode: the file descriptor's inode
- * @mask: the permission mask
+ * selinux_netlbl_socket_post_create - Label a socket using NetLabel
+ * @sock: the socket to label
+ * @family: protocol family
*
* Description:
- * Looks at a file's inode and if it is marked as a socket protected by
- * NetLabel then verify that the socket has been labeled, if not try to label
- * the socket now with the inode's SID. Returns zero on success, negative
- * values on failure.
+ * Attempt to label a socket using the NetLabel mechanism using the given
+ * SID. Returns zero values on success, negative values on failure.
*
*/
-int selinux_netlbl_inode_permission(struct inode *inode, int mask)
+int selinux_netlbl_socket_post_create(struct sock *sk, u16 family)
{
int rc;
- struct sock *sk;
- struct socket *sock;
- struct sk_security_struct *sksec;
+ struct sk_security_struct *sksec = sk->sk_security;
+ struct netlbl_lsm_secattr *secattr;
- if (!S_ISSOCK(inode->i_mode) ||
- ((mask & (MAY_WRITE | MAY_APPEND)) == 0))
- return 0;
- sock = SOCKET_I(inode);
- sk = sock->sk;
- if (sk == NULL)
- return 0;
- sksec = sk->sk_security;
- if (sksec == NULL || sksec->nlbl_state != NLBL_REQUIRE)
+ if (family != PF_INET)
return 0;
- local_bh_disable();
- bh_lock_sock_nested(sk);
- if (likely(sksec->nlbl_state == NLBL_REQUIRE))
- rc = selinux_netlbl_sock_setsid(sk);
- else
+ secattr = selinux_netlbl_sock_genattr(sk);
+ if (secattr == NULL)
+ return -ENOMEM;
+ rc = netlbl_sock_setattr(sk, family, secattr);
+ switch (rc) {
+ case 0:
+ sksec->nlbl_state = NLBL_LABELED;
+ break;
+ case -EDESTADDRREQ:
+ sksec->nlbl_state = NLBL_REQSKB;
rc = 0;
- bh_unlock_sock(sk);
- local_bh_enable();
+ break;
+ }
return rc;
}