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389fb800ac
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>
150 lines
3.7 KiB
C
150 lines
3.7 KiB
C
/*
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* SELinux interface to the NetLabel subsystem
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*
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* Author : Paul Moore <paul.moore@hp.com>
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*
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*/
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/*
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* (c) Copyright Hewlett-Packard Development Company, L.P., 2006
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef _SELINUX_NETLABEL_H_
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#define _SELINUX_NETLABEL_H_
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#include <linux/types.h>
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#include <linux/fs.h>
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#include <linux/net.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/request_sock.h>
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#include "avc.h"
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#include "objsec.h"
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#ifdef CONFIG_NETLABEL
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void selinux_netlbl_cache_invalidate(void);
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void selinux_netlbl_err(struct sk_buff *skb, int error, int gateway);
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void selinux_netlbl_sk_security_free(struct sk_security_struct *ssec);
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void selinux_netlbl_sk_security_reset(struct sk_security_struct *ssec);
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int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
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u16 family,
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u32 *type,
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u32 *sid);
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int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
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u16 family,
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u32 sid);
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int selinux_netlbl_inet_conn_request(struct request_sock *req, u16 family);
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void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family);
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int selinux_netlbl_socket_post_create(struct sock *sk, u16 family);
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int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
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struct sk_buff *skb,
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u16 family,
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struct avc_audit_data *ad);
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int selinux_netlbl_socket_setsockopt(struct socket *sock,
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int level,
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int optname);
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int selinux_netlbl_socket_connect(struct sock *sk, struct sockaddr *addr);
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#else
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static inline void selinux_netlbl_cache_invalidate(void)
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{
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return;
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}
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static inline void selinux_netlbl_err(struct sk_buff *skb,
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int error,
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int gateway)
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{
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return;
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}
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static inline void selinux_netlbl_sk_security_free(
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struct sk_security_struct *ssec)
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{
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return;
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}
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static inline void selinux_netlbl_sk_security_reset(
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struct sk_security_struct *ssec)
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{
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return;
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}
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static inline int selinux_netlbl_skbuff_getsid(struct sk_buff *skb,
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u16 family,
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u32 *type,
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u32 *sid)
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{
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*type = NETLBL_NLTYPE_NONE;
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*sid = SECSID_NULL;
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return 0;
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}
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static inline int selinux_netlbl_skbuff_setsid(struct sk_buff *skb,
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u16 family,
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u32 sid)
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{
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return 0;
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}
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static inline int selinux_netlbl_conn_setsid(struct sock *sk,
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struct sockaddr *addr)
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{
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return 0;
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}
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static inline int selinux_netlbl_inet_conn_request(struct request_sock *req,
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u16 family)
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{
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return 0;
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}
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static inline void selinux_netlbl_inet_csk_clone(struct sock *sk, u16 family)
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{
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return;
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}
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static inline int selinux_netlbl_socket_post_create(struct sock *sk,
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u16 family)
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{
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return 0;
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}
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static inline int selinux_netlbl_sock_rcv_skb(struct sk_security_struct *sksec,
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struct sk_buff *skb,
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u16 family,
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struct avc_audit_data *ad)
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{
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return 0;
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}
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static inline int selinux_netlbl_socket_setsockopt(struct socket *sock,
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int level,
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int optname)
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{
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return 0;
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}
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static inline int selinux_netlbl_socket_connect(struct sock *sk,
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struct sockaddr *addr)
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{
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return 0;
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}
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#endif /* CONFIG_NETLABEL */
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#endif
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