diff options
Diffstat (limited to 'net/ipv6/netfilter')
| -rw-r--r-- | net/ipv6/netfilter/Kconfig | 12 | ||||
| -rw-r--r-- | net/ipv6/netfilter/Makefile | 1 | ||||
| -rw-r--r-- | net/ipv6/netfilter/ip6table_security.c | 172 |
3 files changed, 185 insertions, 0 deletions
diff --git a/net/ipv6/netfilter/Kconfig b/net/ipv6/netfilter/Kconfig index 6cae5475737..689dec899c5 100644 --- 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 fbf2c14ed88..3f17c948eef 100644 --- 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 index 00000000000..063a3d9c3c6 --- /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); |