netfilter: ip6_tables: add ip6tables security table

This is a port of the IPv4 security table for IPv6.

Signed-off-by: James Morris <jmorris@namei.org>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/include/linux/netfilter_ipv6.h b/include/linux/netfilter_ipv6.h
index 3475a65..fd50988 100644 (file)
--- a/include/linux/netfilter_ipv6.h
+++ b/include/linux/netfilter_ipv6.h
@@ -64,6 +64,7 @@ enum nf_ip6_hook_priorities {
        NF_IP6_PRI_MANGLE = -150,
        NF_IP6_PRI_NAT_DST = -100,
        NF_IP6_PRI_FILTER = 0,
+       NF_IP6_PRI_SECURITY = 50,
        NF_IP6_PRI_NAT_SRC = 100,
        NF_IP6_PRI_SELINUX_LAST = 225,
        NF_IP6_PRI_LAST = INT_MAX,

diff --git a/include/net/netns/ipv6.h b/include/net/netns/ipv6.h
index ac053be..5bacd83 100644 (file)
--- a/include/net/netns/ipv6.h
+++ b/include/net/netns/ipv6.h
@@ -35,6 +35,7 @@ struct netns_ipv6 {
        struct xt_table         *ip6table_filter;
        struct xt_table         *ip6table_mangle;
        struct xt_table         *ip6table_raw;
+       struct xt_table         *ip6table_security;
 #endif
        struct rt6_info         *ip6_null_entry;
        struct rt6_statistics   *rt6_stats;

diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig
index 6cae547..689dec8 100644 (file)
--- a/net/ipv6/netfilter/Kconfig
+++ b/net/ipv6/netfilter/Kconfig
@@ -208,5 +208,17 @@ config IP6_NF_RAW
          If you want to compile it as a module, say M here and read
          <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 
+# security table for MAC policy
+config IP6_NF_SECURITY
+       tristate "Security table"
+       depends on IP6_NF_IPTABLES
+       depends on SECURITY
+       default m if NETFILTER_ADVANCED=n
+       help
+         This option adds a `security' table to iptables, for use
+         with Mandatory Access Control (MAC) policy.
+        
+         If unsure, say N.
+
 endmenu
 

diff --git a/net/ipv6/netfilter/Makefile b/net/ipv6/netfilter/Makefile
index fbf2c14..3f17c94 100644 (file)
--- a/net/ipv6/netfilter/Makefile
+++ b/net/ipv6/netfilter/Makefile
@@ -8,6 +8,7 @@ obj-$(CONFIG_IP6_NF_FILTER) += ip6table_filter.o
 obj-$(CONFIG_IP6_NF_MANGLE) += ip6table_mangle.o
 obj-$(CONFIG_IP6_NF_QUEUE) += ip6_queue.o
 obj-$(CONFIG_IP6_NF_RAW) += ip6table_raw.o
+obj-$(CONFIG_IP6_NF_SECURITY) += ip6table_security.o
 
 # objects for l3 independent conntrack
 nf_conntrack_ipv6-objs  :=  nf_conntrack_l3proto_ipv6.o nf_conntrack_proto_icmpv6.o nf_conntrack_reasm.o

diff --git a/net/ipv6/netfilter/ip6table_security.c b/net/ipv6/netfilter/ip6table_security.c
new file mode 100644 (file)
index 0000000..063a3d9
--- /dev/null
+++ b/net/ipv6/netfilter/ip6table_security.c
@@ -0,0 +1,172 @@
+/*
+ * "security" table for IPv6
+ *
+ * This is for use by Mandatory Access Control (MAC) security models,
+ * which need to be able to manage security policy in separate context
+ * to DAC.
+ *
+ * Based on iptable_mangle.c
+ *
+ * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
+ * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
+ * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/module.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
+MODULE_DESCRIPTION("ip6tables security table, for MAC rules");
+
+#define SECURITY_VALID_HOOKS   (1 << NF_INET_LOCAL_IN) | \
+                               (1 << NF_INET_FORWARD) | \
+                               (1 << NF_INET_LOCAL_OUT)
+
+static struct
+{
+       struct ip6t_replace repl;
+       struct ip6t_standard entries[3];
+       struct ip6t_error term;
+} initial_table __initdata = {
+       .repl = {
+               .name = "security",
+               .valid_hooks = SECURITY_VALID_HOOKS,
+               .num_entries = 4,
+               .size = sizeof(struct ip6t_standard) * 3 + sizeof(struct ip6t_error),
+               .hook_entry = {
+                       [NF_INET_LOCAL_IN]      = 0,
+                       [NF_INET_FORWARD]       = sizeof(struct ip6t_standard),
+                       [NF_INET_LOCAL_OUT]     = sizeof(struct ip6t_standard) * 2,
+               },
+               .underflow = {
+                       [NF_INET_LOCAL_IN]      = 0,
+                       [NF_INET_FORWARD]       = sizeof(struct ip6t_standard),
+                       [NF_INET_LOCAL_OUT]     = sizeof(struct ip6t_standard) * 2,
+               },
+       },
+       .entries = {
+               IP6T_STANDARD_INIT(NF_ACCEPT),  /* LOCAL_IN */
+               IP6T_STANDARD_INIT(NF_ACCEPT),  /* FORWARD */
+               IP6T_STANDARD_INIT(NF_ACCEPT),  /* LOCAL_OUT */
+       },
+       .term = IP6T_ERROR_INIT,                /* ERROR */
+};
+
+static struct xt_table security_table = {
+       .name           = "security",
+       .valid_hooks    = SECURITY_VALID_HOOKS,
+       .lock           = __RW_LOCK_UNLOCKED(security_table.lock),
+       .me             = THIS_MODULE,
+       .af             = AF_INET6,
+};
+
+static unsigned int
+ip6t_local_in_hook(unsigned int hook,
+                  struct sk_buff *skb,
+                  const struct net_device *in,
+                  const struct net_device *out,
+                  int (*okfn)(struct sk_buff *))
+{
+       return ip6t_do_table(skb, hook, in, out,
+                            init_net.ipv6.ip6table_security);
+}
+
+static unsigned int
+ip6t_forward_hook(unsigned int hook,
+                 struct sk_buff *skb,
+                 const struct net_device *in,
+                 const struct net_device *out,
+                 int (*okfn)(struct sk_buff *))
+{
+       return ip6t_do_table(skb, hook, in, out,
+                            init_net.ipv6.ip6table_security);
+}
+
+static unsigned int
+ip6t_local_out_hook(unsigned int hook,
+                   struct sk_buff *skb,
+                   const struct net_device *in,
+                   const struct net_device *out,
+                   int (*okfn)(struct sk_buff *))
+{
+       /* TBD: handle short packets via raw socket */
+       return ip6t_do_table(skb, hook, in, out,
+                            init_net.ipv6.ip6table_security);
+}
+
+static struct nf_hook_ops ip6t_ops[] __read_mostly = {
+       {
+               .hook           = ip6t_local_in_hook,
+               .owner          = THIS_MODULE,
+               .pf             = PF_INET6,
+               .hooknum        = NF_INET_LOCAL_IN,
+               .priority       = NF_IP6_PRI_SECURITY,
+       },
+       {
+               .hook           = ip6t_forward_hook,
+               .owner          = THIS_MODULE,
+               .pf             = PF_INET6,
+               .hooknum        = NF_INET_FORWARD,
+               .priority       = NF_IP6_PRI_SECURITY,
+       },
+       {
+               .hook           = ip6t_local_out_hook,
+               .owner          = THIS_MODULE,
+               .pf             = PF_INET6,
+               .hooknum        = NF_INET_LOCAL_OUT,
+               .priority       = NF_IP6_PRI_SECURITY,
+       },
+};
+
+static int __net_init ip6table_security_net_init(struct net *net)
+{
+       net->ipv6.ip6table_security =
+               ip6t_register_table(net, &security_table, &initial_table.repl);
+
+       if (IS_ERR(net->ipv6.ip6table_security))
+               return PTR_ERR(net->ipv6.ip6table_security);
+
+       return 0;
+}
+
+static void __net_exit ip6table_security_net_exit(struct net *net)
+{
+       ip6t_unregister_table(net->ipv6.ip6table_security);
+}
+
+static struct pernet_operations ip6table_security_net_ops = {
+       .init = ip6table_security_net_init,
+       .exit = ip6table_security_net_exit,
+};
+
+static int __init ip6table_security_init(void)
+{
+       int ret;
+
+       ret = register_pernet_subsys(&ip6table_security_net_ops);
+       if (ret < 0)
+               return ret;
+
+       ret = nf_register_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
+       if (ret < 0)
+               goto cleanup_table;
+
+       return ret;
+
+cleanup_table:
+       unregister_pernet_subsys(&ip6table_security_net_ops);
+       return ret;
+}
+
+static void __exit ip6table_security_fini(void)
+{
+       nf_unregister_hooks(ip6t_ops, ARRAY_SIZE(ip6t_ops));
+       unregister_pernet_subsys(&ip6table_security_net_ops);
+}
+
+module_init(ip6table_security_init);
+module_exit(ip6table_security_fini);