SELinux: Add a network node caching mechanism similar to the sel_netif_*() functions

This patch adds a SELinux IP address/node SID caching mechanism similar to the
sel_netif_*() functions.  The node SID queries in the SELinux hooks files are
also modified to take advantage of this new functionality.  In addition, remove
the address length information from the sk_buff parsing routines as it is
redundant since we already have the address family.

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

1 files changed, 350 insertions, 0 deletions

diff --git a/security/selinux/netnode.c b/security/selinux/netnode.c
new file mode 100644
index 000000000000..49c527799240
--- /dev/null
+++ b/security/selinux/netnode.c
@@ -0,0 +1,350 @@
+/*
+ * Network node table
+ *
+ * SELinux must keep a mapping of network nodes to labels/SIDs.  This
+ * mapping is maintained as part of the normal policy but a fast cache is
+ * needed to reduce the lookup overhead since most of these queries happen on
+ * a per-packet basis.
+ *
+ * Author: Paul Moore <paul.moore@hp.com>
+ *
+ * This code is heavily based on the "netif" concept originally developed by
+ * James Morris <jmorris@redhat.com>
+ *   (see security/selinux/netif.c for more information)
+ *
+ */
+
+/*
+ * (c) Copyright Hewlett-Packard Development Company, L.P., 2007
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/rcupdate.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/ip.h>
+#include <linux/ipv6.h>
+#include <net/ip.h>
+#include <net/ipv6.h>
+#include <asm/bug.h>
+
+#include "objsec.h"
+
+#define SEL_NETNODE_HASH_SIZE       256
+#define SEL_NETNODE_HASH_BKT_LIMIT   16
+
+struct sel_netnode {
+        struct netnode_security_struct nsec;
+
+        struct list_head list;
+        struct rcu_head rcu;
+};
+
+/* NOTE: we are using a combined hash table for both IPv4 and IPv6, the reason
+ * for this is that I suspect most users will not make heavy use of both
+ * address families at the same time so one table will usually end up wasted,
+ * if this becomes a problem we can always add a hash table for each address
+ * family later */
+
+static LIST_HEAD(sel_netnode_list);
+static DEFINE_SPINLOCK(sel_netnode_lock);
+static struct list_head sel_netnode_hash[SEL_NETNODE_HASH_SIZE];
+
+/**
+ * sel_netnode_free - Frees a node entry
+ * @p: the entry's RCU field
+ *
+ * Description:
+ * This function is designed to be used as a callback to the call_rcu()
+ * function so that memory allocated to a hash table node entry can be
+ * released safely.
+ *
+ */
+static void sel_netnode_free(struct rcu_head *p)
+{
+        struct sel_netnode *node = container_of(p, struct sel_netnode, rcu);
+        kfree(node);
+}
+
+/**
+ * sel_netnode_hashfn_ipv4 - IPv4 hashing function for the node table
+ * @addr: IPv4 address
+ *
+ * Description:
+ * This is the IPv4 hashing function for the node interface table, it returns
+ * the bucket number for the given IP address.
+ *
+ */
+static u32 sel_netnode_hashfn_ipv4(__be32 addr)
+{
+        /* at some point we should determine if the mismatch in byte order
+         * affects the hash function dramatically */
+        return (addr & (SEL_NETNODE_HASH_SIZE - 1));
+}
+
+/**
+ * sel_netnode_hashfn_ipv6 - IPv6 hashing function for the node table
+ * @addr: IPv6 address
+ *
+ * Description:
+ * This is the IPv6 hashing function for the node interface table, it returns
+ * the bucket number for the given IP address.
+ *
+ */
+static u32 sel_netnode_hashfn_ipv6(const struct in6_addr *addr)
+{
+        /* just hash the least significant 32 bits to keep things fast (they
+         * are the most likely to be different anyway), we can revisit this
+         * later if needed */
+        return (addr->s6_addr32[3] & (SEL_NETNODE_HASH_SIZE - 1));
+}
+
+/**
+ * sel_netnode_find - Search for a node record
+ * @addr: IP address
+ * @family: address family
+ *
+ * Description:
+ * Search the network node table and return the record matching @addr.  If an
+ * entry can not be found in the table return NULL.
+ *
+ */
+static struct sel_netnode *sel_netnode_find(const void *addr, u16 family)
+{
+        u32 idx;
+        struct sel_netnode *node;
+
+        switch (family) {
+        case PF_INET:
+                idx = sel_netnode_hashfn_ipv4(*(__be32 *)addr);
+                break;
+        case PF_INET6:
+                idx = sel_netnode_hashfn_ipv6(addr);
+                break;
+        default:
+                BUG();
+        }
+
+        list_for_each_entry_rcu(node, &sel_netnode_hash[idx], list)
+                if (node->nsec.family == family)
+                        switch (family) {
+                        case PF_INET:
+                                if (node->nsec.addr.ipv4 == *(__be32 *)addr)
+                                        return node;
+                                break;
+                        case PF_INET6:
+                                if (ipv6_addr_equal(&node->nsec.addr.ipv6,
+                                                    addr))
+                                        return node;
+                                break;
+                        }
+
+        return NULL;
+}
+
+/**
+ * sel_netnode_insert - Insert a new node into the table
+ * @node: the new node record
+ *
+ * Description:
+ * Add a new node record to the network address hash table.  Returns zero on
+ * success, negative values on failure.
+ *
+ */
+static int sel_netnode_insert(struct sel_netnode *node)
+{
+        u32 idx;
+        u32 count = 0;
+        struct sel_netnode *iter;
+
+        switch (node->nsec.family) {
+        case PF_INET:
+                idx = sel_netnode_hashfn_ipv4(node->nsec.addr.ipv4);
+                break;
+        case PF_INET6:
+                idx = sel_netnode_hashfn_ipv6(&node->nsec.addr.ipv6);
+                break;
+        default:
+                BUG();
+        }
+        list_add_rcu(&node->list, &sel_netnode_hash[idx]);
+
+        /* we need to impose a limit on the growth of the hash table so check
+         * this bucket to make sure it is within the specified bounds */
+        list_for_each_entry(iter, &sel_netnode_hash[idx], list)
+                if (++count > SEL_NETNODE_HASH_BKT_LIMIT) {
+                        list_del_rcu(&iter->list);
+                        call_rcu(&iter->rcu, sel_netnode_free);
+                        break;
+                }
+
+        return 0;
+}
+
+/**
+ * sel_netnode_destroy - Remove a node record from the table
+ * @node: the existing node record
+ *
+ * Description:
+ * Remove an existing node record from the network address table.
+ *
+ */
+static void sel_netnode_destroy(struct sel_netnode *node)
+{
+        list_del_rcu(&node->list);
+        call_rcu(&node->rcu, sel_netnode_free);
+}
+
+/**
+ * sel_netnode_sid_slow - Lookup the SID of a network address using the policy
+ * @addr: the IP address
+ * @family: the address family
+ * @sid: node SID
+ *
+ * Description:
+ * This function determines the SID of a network address by quering the
+ * security policy.  The result is added to the network address table to
+ * speedup future queries.  Returns zero on success, negative values on
+ * failure.
+ *
+ */
+static int sel_netnode_sid_slow(void *addr, u16 family, u32 *sid)
+{
+        int ret;
+        struct sel_netnode *node;
+        struct sel_netnode *new = NULL;
+
+        spin_lock_bh(&sel_netnode_lock);
+        node = sel_netnode_find(addr, family);
+        if (node != NULL) {
+                *sid = node->nsec.sid;
+                ret = 0;
+                goto out;
+        }
+        new = kzalloc(sizeof(*new), GFP_ATOMIC);
+        if (new == NULL) {
+                ret = -ENOMEM;
+                goto out;
+        }
+        switch (family) {
+        case PF_INET:
+                ret = security_node_sid(PF_INET,
+                                        addr, sizeof(struct in_addr),
+                                        &new->nsec.sid);
+                new->nsec.addr.ipv4 = *(__be32 *)addr;
+                break;
+        case PF_INET6:
+                ret = security_node_sid(PF_INET6,
+                                        addr, sizeof(struct in6_addr),
+                                        &new->nsec.sid);
+                ipv6_addr_copy(&new->nsec.addr.ipv6, addr);
+                break;
+        default:
+                BUG();
+        }
+        if (ret != 0)
+                goto out;
+        new->nsec.family = family;
+        ret = sel_netnode_insert(new);
+        if (ret != 0)
+                goto out;
+        *sid = new->nsec.sid;
+
+out:
+        spin_unlock_bh(&sel_netnode_lock);
+        if (ret != 0)
+                kfree(new);
+        return ret;
+}
+
+/**
+ * sel_netnode_sid - Lookup the SID of a network address
+ * @addr: the IP address
+ * @family: the address family
+ * @sid: node SID
+ *
+ * Description:
+ * This function determines the SID of a network address using the fastest
+ * method possible.  First the address 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_netnode_sid(void *addr, u16 family, u32 *sid)
+{
+        struct sel_netnode *node;
+
+        rcu_read_lock();
+        node = sel_netnode_find(addr, family);
+        if (node != NULL) {
+                *sid = node->nsec.sid;
+                rcu_read_unlock();
+                return 0;
+        }
+        rcu_read_unlock();
+
+        return sel_netnode_sid_slow(addr, family, sid);
+}
+
+/**
+ * sel_netnode_flush - Flush the entire network address table
+ *
+ * Description:
+ * Remove all entries from the network address table.
+ *
+ */
+static void sel_netnode_flush(void)
+{
+        u32 idx;
+        struct sel_netnode *node;
+
+        spin_lock_bh(&sel_netnode_lock);
+        for (idx = 0; idx < SEL_NETNODE_HASH_SIZE; idx++)
+                list_for_each_entry(node, &sel_netnode_hash[idx], list)
+                        sel_netnode_destroy(node);
+        spin_unlock_bh(&sel_netnode_lock);
+}
+
+static int sel_netnode_avc_callback(u32 event, u32 ssid, u32 tsid,
+                                    u16 class, u32 perms, u32 *retained)
+{
+        if (event == AVC_CALLBACK_RESET) {
+                sel_netnode_flush();
+                synchronize_net();
+        }
+        return 0;
+}
+
+static __init int sel_netnode_init(void)
+{
+        int iter;
+        int ret;
+
+        if (!selinux_enabled)
+                return 0;
+
+        for (iter = 0; iter < SEL_NETNODE_HASH_SIZE; iter++)
+                INIT_LIST_HEAD(&sel_netnode_hash[iter]);
+
+        ret = avc_add_callback(sel_netnode_avc_callback, AVC_CALLBACK_RESET,
+                               SECSID_NULL, SECSID_NULL, SECCLASS_NULL, 0);
+        if (ret != 0)
+                panic("avc_add_callback() failed, error %d\n", ret);
+
+        return ret;
+}
+
+__initcall(sel_netnode_init);