selinux: Remove the "compat_net" compatibility code
Paul Moore [Fri, 27 Mar 2009 21:10:41 +0000 (17:10 -0400)]
The SELinux "compat_net" is marked as deprecated, the time has come to
finally remove it from the kernel.  Further code simplifications are
likely in the future, but this patch was intended to be a simple,
straight-up removal of the compat_net code.

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

Documentation/feature-removal-schedule.txt
Documentation/kernel-parameters.txt
security/selinux/hooks.c
security/selinux/selinuxfs.c

index 02ea377..049a962 100644 (file)
@@ -355,17 +355,6 @@ Who:       Hans de Goede <hdegoede@redhat.com>
 
 ---------------------------
 
-What:  SELinux "compat_net" functionality
-When:  2.6.30 at the earliest
-Why:   In 2.6.18 the Secmark concept was introduced to replace the "compat_net"
-       network access control functionality of SELinux.  Secmark offers both
-       better performance and greater flexibility than the "compat_net"
-       mechanism.  Now that the major Linux distributions have moved to
-       Secmark, it is time to deprecate the older mechanism and start the
-       process of removing the old code.
-Who:   Paul Moore <paul.moore@hp.com>
----------------------------
-
 What:  sysfs ui for changing p4-clockmod parameters
 When:  September 2009
 Why:   See commits 129f8ae9b1b5be94517da76009ea956e89104ce8 and
index fa4e123..d1b0827 100644 (file)
@@ -2019,15 +2019,6 @@ and is between 256 and 4096 characters. It is defined in the file
                        If enabled at boot time, /selinux/disable can be used
                        later to disable prior to initial policy load.
 
-       selinux_compat_net =
-                       [SELINUX] Set initial selinux_compat_net flag value.
-                        Format: { "0" | "1" }
-                        0 -- use new secmark-based packet controls
-                        1 -- use legacy packet controls
-                        Default value is 0 (preferred).
-                        Value can be changed at runtime via
-                        /selinux/compat_net.
-
        serialnumber    [BUGS=X86-32]
 
        shapers=        [NET]
index ee2e781..ba808ef 100644 (file)
@@ -93,7 +93,6 @@
 
 extern unsigned int policydb_loaded_version;
 extern int selinux_nlmsg_lookup(u16 sclass, u16 nlmsg_type, u32 *perm);
-extern int selinux_compat_net;
 extern struct security_operations *security_ops;
 
 /* SECMARK reference count */
@@ -4019,72 +4018,6 @@ static int selinux_inet_sys_rcv_skb(int ifindex, char *addrp, u16 family,
                            SECCLASS_NODE, NODE__RECVFROM, ad);
 }
 
-static int selinux_sock_rcv_skb_iptables_compat(struct sock *sk,
-                                               struct sk_buff *skb,
-                                               struct avc_audit_data *ad,
-                                               u16 family,
-                                               char *addrp)
-{
-       int err;
-       struct sk_security_struct *sksec = sk->sk_security;
-       u16 sk_class;
-       u32 netif_perm, node_perm, recv_perm;
-       u32 port_sid, node_sid, if_sid, sk_sid;
-
-       sk_sid = sksec->sid;
-       sk_class = sksec->sclass;
-
-       switch (sk_class) {
-       case SECCLASS_UDP_SOCKET:
-               netif_perm = NETIF__UDP_RECV;
-               node_perm = NODE__UDP_RECV;
-               recv_perm = UDP_SOCKET__RECV_MSG;
-               break;
-       case SECCLASS_TCP_SOCKET:
-               netif_perm = NETIF__TCP_RECV;
-               node_perm = NODE__TCP_RECV;
-               recv_perm = TCP_SOCKET__RECV_MSG;
-               break;
-       case SECCLASS_DCCP_SOCKET:
-               netif_perm = NETIF__DCCP_RECV;
-               node_perm = NODE__DCCP_RECV;
-               recv_perm = DCCP_SOCKET__RECV_MSG;
-               break;
-       default:
-               netif_perm = NETIF__RAWIP_RECV;
-               node_perm = NODE__RAWIP_RECV;
-               recv_perm = 0;
-               break;
-       }
-
-       err = sel_netif_sid(skb->iif, &if_sid);
-       if (err)
-               return err;
-       err = avc_has_perm(sk_sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
-       if (err)
-               return err;
-
-       err = sel_netnode_sid(addrp, family, &node_sid);
-       if (err)
-               return err;
-       err = avc_has_perm(sk_sid, node_sid, SECCLASS_NODE, node_perm, ad);
-       if (err)
-               return err;
-
-       if (!recv_perm)
-               return 0;
-       err = sel_netport_sid(sk->sk_protocol,
-                             ntohs(ad->u.net.sport), &port_sid);
-       if (unlikely(err)) {
-               printk(KERN_WARNING
-                      "SELinux: failure in"
-                      " selinux_sock_rcv_skb_iptables_compat(),"
-                      " network port label not found\n");
-               return err;
-       }
-       return avc_has_perm(sk_sid, port_sid, sk_class, recv_perm, ad);
-}
-
 static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
                                       u16 family)
 {
@@ -4102,14 +4035,12 @@ static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
        if (err)
                return err;
 
-       if (selinux_compat_net)
-               err = selinux_sock_rcv_skb_iptables_compat(sk, skb, &ad,
-                                                          family, addrp);
-       else if (selinux_secmark_enabled())
+       if (selinux_secmark_enabled()) {
                err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
                                   PACKET__RECV, &ad);
-       if (err)
-               return err;
+               if (err)
+                       return err;
+       }
 
        if (selinux_policycap_netpeer) {
                err = selinux_skb_peerlbl_sid(skb, family, &peer_sid);
@@ -4151,7 +4082,7 @@ static int selinux_socket_sock_rcv_skb(struct sock *sk, struct sk_buff *skb)
         * to the selinux_sock_rcv_skb_compat() function to deal with the
         * special handling.  We do this in an attempt to keep this function
         * as fast and as clean as possible. */
-       if (selinux_compat_net || !selinux_policycap_netpeer)
+       if (!selinux_policycap_netpeer)
                return selinux_sock_rcv_skb_compat(sk, skb, family);
 
        secmark_active = selinux_secmark_enabled();
@@ -4516,71 +4447,6 @@ static unsigned int selinux_ipv4_output(unsigned int hooknum,
        return selinux_ip_output(skb, PF_INET);
 }
 
-static int selinux_ip_postroute_iptables_compat(struct sock *sk,
-                                               int ifindex,
-                                               struct avc_audit_data *ad,
-                                               u16 family, char *addrp)
-{
-       int err;
-       struct sk_security_struct *sksec = sk->sk_security;
-       u16 sk_class;
-       u32 netif_perm, node_perm, send_perm;
-       u32 port_sid, node_sid, if_sid, sk_sid;
-
-       sk_sid = sksec->sid;
-       sk_class = sksec->sclass;
-
-       switch (sk_class) {
-       case SECCLASS_UDP_SOCKET:
-               netif_perm = NETIF__UDP_SEND;
-               node_perm = NODE__UDP_SEND;
-               send_perm = UDP_SOCKET__SEND_MSG;
-               break;
-       case SECCLASS_TCP_SOCKET:
-               netif_perm = NETIF__TCP_SEND;
-               node_perm = NODE__TCP_SEND;
-               send_perm = TCP_SOCKET__SEND_MSG;
-               break;
-       case SECCLASS_DCCP_SOCKET:
-               netif_perm = NETIF__DCCP_SEND;
-               node_perm = NODE__DCCP_SEND;
-               send_perm = DCCP_SOCKET__SEND_MSG;
-               break;
-       default:
-               netif_perm = NETIF__RAWIP_SEND;
-               node_perm = NODE__RAWIP_SEND;
-               send_perm = 0;
-               break;
-       }
-
-       err = sel_netif_sid(ifindex, &if_sid);
-       if (err)
-               return err;
-       err = avc_has_perm(sk_sid, if_sid, SECCLASS_NETIF, netif_perm, ad);
-               return err;
-
-       err = sel_netnode_sid(addrp, family, &node_sid);
-       if (err)
-               return err;
-       err = avc_has_perm(sk_sid, node_sid, SECCLASS_NODE, node_perm, ad);
-       if (err)
-               return err;
-
-       if (send_perm != 0)
-               return 0;
-
-       err = sel_netport_sid(sk->sk_protocol,
-                             ntohs(ad->u.net.dport), &port_sid);
-       if (unlikely(err)) {
-               printk(KERN_WARNING
-                      "SELinux: failure in"
-                      " selinux_ip_postroute_iptables_compat(),"
-                      " network port label not found\n");
-               return err;
-       }
-       return avc_has_perm(sk_sid, port_sid, sk_class, send_perm, ad);
-}
-
 static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
                                                int ifindex,
                                                u16 family)
@@ -4601,15 +4467,10 @@ static unsigned int selinux_ip_postroute_compat(struct sk_buff *skb,
        if (selinux_parse_skb(skb, &ad, &addrp, 0, &proto))
                return NF_DROP;
 
-       if (selinux_compat_net) {
-               if (selinux_ip_postroute_iptables_compat(skb->sk, ifindex,
-                                                        &ad, family, addrp))
-                       return NF_DROP;
-       } else if (selinux_secmark_enabled()) {
+       if (selinux_secmark_enabled())
                if (avc_has_perm(sksec->sid, skb->secmark,
                                 SECCLASS_PACKET, PACKET__SEND, &ad))
                        return NF_DROP;
-       }
 
        if (selinux_policycap_netpeer)
                if (selinux_xfrm_postroute_last(sksec->sid, skb, &ad, proto))
@@ -4633,7 +4494,7 @@ static unsigned int selinux_ip_postroute(struct sk_buff *skb, int ifindex,
         * to the selinux_ip_postroute_compat() function to deal with the
         * special handling.  We do this in an attempt to keep this function
         * as fast and as clean as possible. */
-       if (selinux_compat_net || !selinux_policycap_netpeer)
+       if (!selinux_policycap_netpeer)
                return selinux_ip_postroute_compat(skb, ifindex, family);
 #ifdef CONFIG_XFRM
        /* If skb->dst->xfrm is non-NULL then the packet is undergoing an IPsec
index d3c8b98..2d5136e 100644 (file)
@@ -47,8 +47,6 @@ static char *policycap_names[] = {
 
 unsigned int selinux_checkreqprot = CONFIG_SECURITY_SELINUX_CHECKREQPROT_VALUE;
 
-int selinux_compat_net = 0;
-
 static int __init checkreqprot_setup(char *str)
 {
        unsigned long checkreqprot;
@@ -58,16 +56,6 @@ static int __init checkreqprot_setup(char *str)
 }
 __setup("checkreqprot=", checkreqprot_setup);
 
-static int __init selinux_compat_net_setup(char *str)
-{
-       unsigned long compat_net;
-       if (!strict_strtoul(str, 0, &compat_net))
-               selinux_compat_net = compat_net ? 1 : 0;
-       return 1;
-}
-__setup("selinux_compat_net=", selinux_compat_net_setup);
-
-
 static DEFINE_MUTEX(sel_mutex);
 
 /* global data for booleans */
@@ -450,61 +438,6 @@ static const struct file_operations sel_checkreqprot_ops = {
        .write          = sel_write_checkreqprot,
 };
 
-static ssize_t sel_read_compat_net(struct file *filp, char __user *buf,
-                                  size_t count, loff_t *ppos)
-{
-       char tmpbuf[TMPBUFLEN];
-       ssize_t length;
-
-       length = scnprintf(tmpbuf, TMPBUFLEN, "%d", selinux_compat_net);
-       return simple_read_from_buffer(buf, count, ppos, tmpbuf, length);
-}
-
-static ssize_t sel_write_compat_net(struct file *file, const char __user *buf,
-                                   size_t count, loff_t *ppos)
-{
-       char *page;
-       ssize_t length;
-       int new_value;
-
-       length = task_has_security(current, SECURITY__LOAD_POLICY);
-       if (length)
-               return length;
-
-       if (count >= PAGE_SIZE)
-               return -ENOMEM;
-       if (*ppos != 0) {
-               /* No partial writes. */
-               return -EINVAL;
-       }
-       page = (char *)get_zeroed_page(GFP_KERNEL);
-       if (!page)
-               return -ENOMEM;
-       length = -EFAULT;
-       if (copy_from_user(page, buf, count))
-               goto out;
-
-       length = -EINVAL;
-       if (sscanf(page, "%d", &new_value) != 1)
-               goto out;
-
-       if (new_value) {
-               printk(KERN_NOTICE
-                      "SELinux: compat_net is deprecated, please use secmark"
-                      " instead\n");
-               selinux_compat_net = 1;
-       } else
-               selinux_compat_net = 0;
-       length = count;
-out:
-       free_page((unsigned long) page);
-       return length;
-}
-static const struct file_operations sel_compat_net_ops = {
-       .read           = sel_read_compat_net,
-       .write          = sel_write_compat_net,
-};
-
 /*
  * Remaining nodes use transaction based IO methods like nfsd/nfsctl.c
  */
@@ -1665,7 +1598,6 @@ static int sel_fill_super(struct super_block *sb, void *data, int silent)
                [SEL_DISABLE] = {"disable", &sel_disable_ops, S_IWUSR},
                [SEL_MEMBER] = {"member", &transaction_ops, S_IRUGO|S_IWUGO},
                [SEL_CHECKREQPROT] = {"checkreqprot", &sel_checkreqprot_ops, S_IRUGO|S_IWUSR},
-               [SEL_COMPAT_NET] = {"compat_net", &sel_compat_net_ops, S_IRUGO|S_IWUSR},
                [SEL_REJECT_UNKNOWN] = {"reject_unknown", &sel_handle_unknown_ops, S_IRUGO},
                [SEL_DENY_UNKNOWN] = {"deny_unknown", &sel_handle_unknown_ops, S_IRUGO},
                /* last one */ {""}