mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 21:24:00 +08:00
6c5a682e64
Rename selinux_enabled to selinux_enabled_boot to make it clear that it only reflects whether SELinux was enabled at boot. Replace the references to it in the MAC_STATUS audit log in sel_write_enforce() with hardcoded "1" values because this code is only reachable if SELinux is enabled and does not change its value, and update the corresponding MAC_STATUS audit log in sel_write_disable(). Stop clearing selinux_enabled in selinux_disable() since it is not used outside of initialization code that runs before selinux_disable() can be reached. Mark both selinux_enabled_boot and selinux_enforcing_boot as __initdata since they are only used in initialization code. Wrap the disabled field in the struct selinux_state with CONFIG_SECURITY_SELINUX_DISABLE since it is only used for runtime disable. Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov> Signed-off-by: Paul Moore <paul@paul-moore.com>
282 lines
6.8 KiB
C
282 lines
6.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Network interface table.
|
|
*
|
|
* Network interfaces (devices) do not have a security field, so we
|
|
* maintain a table associating each interface with a SID.
|
|
*
|
|
* Author: James Morris <jmorris@redhat.com>
|
|
*
|
|
* Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
|
|
* Copyright (C) 2007 Hewlett-Packard Development Company, L.P.
|
|
* Paul Moore <paul@paul-moore.com>
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/list.h>
|
|
#include <linux/notifier.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <net/net_namespace.h>
|
|
|
|
#include "security.h"
|
|
#include "objsec.h"
|
|
#include "netif.h"
|
|
|
|
#define SEL_NETIF_HASH_SIZE 64
|
|
#define SEL_NETIF_HASH_MAX 1024
|
|
|
|
struct sel_netif {
|
|
struct list_head list;
|
|
struct netif_security_struct nsec;
|
|
struct rcu_head rcu_head;
|
|
};
|
|
|
|
static u32 sel_netif_total;
|
|
static LIST_HEAD(sel_netif_list);
|
|
static DEFINE_SPINLOCK(sel_netif_lock);
|
|
static struct list_head sel_netif_hash[SEL_NETIF_HASH_SIZE];
|
|
|
|
/**
|
|
* sel_netif_hashfn - Hashing function for the interface table
|
|
* @ns: the network namespace
|
|
* @ifindex: the network interface
|
|
*
|
|
* Description:
|
|
* This is the hashing function for the network interface table, it returns the
|
|
* bucket number for the given interface.
|
|
*
|
|
*/
|
|
static inline u32 sel_netif_hashfn(const struct net *ns, int ifindex)
|
|
{
|
|
return (((uintptr_t)ns + ifindex) & (SEL_NETIF_HASH_SIZE - 1));
|
|
}
|
|
|
|
/**
|
|
* sel_netif_find - Search for an interface record
|
|
* @ns: the network namespace
|
|
* @ifindex: the network interface
|
|
*
|
|
* Description:
|
|
* Search the network interface table and return the record matching @ifindex.
|
|
* If an entry can not be found in the table return NULL.
|
|
*
|
|
*/
|
|
static inline struct sel_netif *sel_netif_find(const struct net *ns,
|
|
int ifindex)
|
|
{
|
|
int idx = sel_netif_hashfn(ns, ifindex);
|
|
struct sel_netif *netif;
|
|
|
|
list_for_each_entry_rcu(netif, &sel_netif_hash[idx], list)
|
|
if (net_eq(netif->nsec.ns, ns) &&
|
|
netif->nsec.ifindex == ifindex)
|
|
return netif;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* sel_netif_insert - Insert a new interface into the table
|
|
* @netif: the new interface record
|
|
*
|
|
* Description:
|
|
* Add a new interface record to the network interface hash table. Returns
|
|
* zero on success, negative values on failure.
|
|
*
|
|
*/
|
|
static int sel_netif_insert(struct sel_netif *netif)
|
|
{
|
|
int idx;
|
|
|
|
if (sel_netif_total >= SEL_NETIF_HASH_MAX)
|
|
return -ENOSPC;
|
|
|
|
idx = sel_netif_hashfn(netif->nsec.ns, netif->nsec.ifindex);
|
|
list_add_rcu(&netif->list, &sel_netif_hash[idx]);
|
|
sel_netif_total++;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* sel_netif_destroy - Remove an interface record from the table
|
|
* @netif: the existing interface record
|
|
*
|
|
* Description:
|
|
* Remove an existing interface record from the network interface table.
|
|
*
|
|
*/
|
|
static void sel_netif_destroy(struct sel_netif *netif)
|
|
{
|
|
list_del_rcu(&netif->list);
|
|
sel_netif_total--;
|
|
kfree_rcu(netif, rcu_head);
|
|
}
|
|
|
|
/**
|
|
* sel_netif_sid_slow - Lookup the SID of a network interface using the policy
|
|
* @ns: the network namespace
|
|
* @ifindex: the network interface
|
|
* @sid: interface SID
|
|
*
|
|
* Description:
|
|
* This function determines the SID of a network interface by quering the
|
|
* security policy. The result is added to the network interface table to
|
|
* speedup future queries. Returns zero on success, negative values on
|
|
* failure.
|
|
*
|
|
*/
|
|
static int sel_netif_sid_slow(struct net *ns, int ifindex, u32 *sid)
|
|
{
|
|
int ret = 0;
|
|
struct sel_netif *netif;
|
|
struct sel_netif *new;
|
|
struct net_device *dev;
|
|
|
|
/* NOTE: we always use init's network namespace since we don't
|
|
* currently support containers */
|
|
|
|
dev = dev_get_by_index(ns, ifindex);
|
|
if (unlikely(dev == NULL)) {
|
|
pr_warn("SELinux: failure in %s(), invalid network interface (%d)\n",
|
|
__func__, ifindex);
|
|
return -ENOENT;
|
|
}
|
|
|
|
spin_lock_bh(&sel_netif_lock);
|
|
netif = sel_netif_find(ns, ifindex);
|
|
if (netif != NULL) {
|
|
*sid = netif->nsec.sid;
|
|
goto out;
|
|
}
|
|
|
|
ret = security_netif_sid(&selinux_state, dev->name, sid);
|
|
if (ret != 0)
|
|
goto out;
|
|
new = kzalloc(sizeof(*new), GFP_ATOMIC);
|
|
if (new) {
|
|
new->nsec.ns = ns;
|
|
new->nsec.ifindex = ifindex;
|
|
new->nsec.sid = *sid;
|
|
if (sel_netif_insert(new))
|
|
kfree(new);
|
|
}
|
|
|
|
out:
|
|
spin_unlock_bh(&sel_netif_lock);
|
|
dev_put(dev);
|
|
if (unlikely(ret))
|
|
pr_warn("SELinux: failure in %s(), unable to determine network interface label (%d)\n",
|
|
__func__, ifindex);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* sel_netif_sid - Lookup the SID of a network interface
|
|
* @ns: the network namespace
|
|
* @ifindex: the network interface
|
|
* @sid: interface SID
|
|
*
|
|
* Description:
|
|
* This function determines the SID of a network interface using the fastest
|
|
* method possible. First the interface table is queried, but if an entry
|
|
* can't be found then the policy is queried and the result is added to the
|
|
* table to speedup future queries. Returns zero on success, negative values
|
|
* on failure.
|
|
*
|
|
*/
|
|
int sel_netif_sid(struct net *ns, int ifindex, u32 *sid)
|
|
{
|
|
struct sel_netif *netif;
|
|
|
|
rcu_read_lock();
|
|
netif = sel_netif_find(ns, ifindex);
|
|
if (likely(netif != NULL)) {
|
|
*sid = netif->nsec.sid;
|
|
rcu_read_unlock();
|
|
return 0;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return sel_netif_sid_slow(ns, ifindex, sid);
|
|
}
|
|
|
|
/**
|
|
* sel_netif_kill - Remove an entry from the network interface table
|
|
* @ns: the network namespace
|
|
* @ifindex: the network interface
|
|
*
|
|
* Description:
|
|
* This function removes the entry matching @ifindex from the network interface
|
|
* table if it exists.
|
|
*
|
|
*/
|
|
static void sel_netif_kill(const struct net *ns, int ifindex)
|
|
{
|
|
struct sel_netif *netif;
|
|
|
|
rcu_read_lock();
|
|
spin_lock_bh(&sel_netif_lock);
|
|
netif = sel_netif_find(ns, ifindex);
|
|
if (netif)
|
|
sel_netif_destroy(netif);
|
|
spin_unlock_bh(&sel_netif_lock);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
/**
|
|
* sel_netif_flush - Flush the entire network interface table
|
|
*
|
|
* Description:
|
|
* Remove all entries from the network interface table.
|
|
*
|
|
*/
|
|
void sel_netif_flush(void)
|
|
{
|
|
int idx;
|
|
struct sel_netif *netif;
|
|
|
|
spin_lock_bh(&sel_netif_lock);
|
|
for (idx = 0; idx < SEL_NETIF_HASH_SIZE; idx++)
|
|
list_for_each_entry(netif, &sel_netif_hash[idx], list)
|
|
sel_netif_destroy(netif);
|
|
spin_unlock_bh(&sel_netif_lock);
|
|
}
|
|
|
|
static int sel_netif_netdev_notifier_handler(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
|
|
if (event == NETDEV_DOWN)
|
|
sel_netif_kill(dev_net(dev), dev->ifindex);
|
|
|
|
return NOTIFY_DONE;
|
|
}
|
|
|
|
static struct notifier_block sel_netif_netdev_notifier = {
|
|
.notifier_call = sel_netif_netdev_notifier_handler,
|
|
};
|
|
|
|
static __init int sel_netif_init(void)
|
|
{
|
|
int i;
|
|
|
|
if (!selinux_enabled_boot)
|
|
return 0;
|
|
|
|
for (i = 0; i < SEL_NETIF_HASH_SIZE; i++)
|
|
INIT_LIST_HEAD(&sel_netif_hash[i]);
|
|
|
|
register_netdevice_notifier(&sel_netif_netdev_notifier);
|
|
|
|
return 0;
|
|
}
|
|
|
|
__initcall(sel_netif_init);
|
|
|