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selinux: Remove the "compat_net" compatibility code
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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>
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Paul Moore authored and James Morris committed Mar 28, 2009
1 parent 389fb80 commit 58bfbb5
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Showing 4 changed files with 7 additions and 234 deletions.
11 changes: 0 additions & 11 deletions Documentation/feature-removal-schedule.txt
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Expand Up @@ -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
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9 changes: 0 additions & 9 deletions Documentation/kernel-parameters.txt
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Expand Up @@ -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]
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153 changes: 7 additions & 146 deletions security/selinux/hooks.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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 */
Expand Down Expand Up @@ -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)
{
Expand All @@ -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);
Expand Down Expand Up @@ -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();
Expand Down Expand Up @@ -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)
Expand All @@ -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))
Expand All @@ -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
Expand Down
68 changes: 0 additions & 68 deletions security/selinux/selinuxfs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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;
Expand All @@ -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 */
Expand Down Expand Up @@ -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
*/
Expand Down Expand Up @@ -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 */ {""}
Expand Down

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