diff options
Diffstat (limited to 'security/smack/smack_netfilter.c')
-rw-r--r-- | security/smack/smack_netfilter.c | 100 |
1 files changed, 100 insertions, 0 deletions
diff --git a/security/smack/smack_netfilter.c b/security/smack/smack_netfilter.c new file mode 100644 index 000000000..fc7399b45 --- /dev/null +++ b/security/smack/smack_netfilter.c @@ -0,0 +1,100 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Simplified MAC Kernel (smack) security module + * + * This file contains the Smack netfilter implementation + * + * Author: + * Casey Schaufler <casey@schaufler-ca.com> + * + * Copyright (C) 2014 Casey Schaufler <casey@schaufler-ca.com> + * Copyright (C) 2014 Intel Corporation. + */ + +#include <linux/netfilter_ipv4.h> +#include <linux/netfilter_ipv6.h> +#include <linux/netdevice.h> +#include <net/inet_sock.h> +#include <net/net_namespace.h> +#include "smack.h" + +#if IS_ENABLED(CONFIG_IPV6) + +static unsigned int smack_ipv6_output(void *priv, + struct sk_buff *skb, + const struct nf_hook_state *state) +{ + struct sock *sk = skb_to_full_sk(skb); + struct socket_smack *ssp; + struct smack_known *skp; + + if (sk && sk->sk_security) { + ssp = sk->sk_security; + skp = ssp->smk_out; + skb->secmark = skp->smk_secid; + } + + return NF_ACCEPT; +} +#endif /* IPV6 */ + +static unsigned int smack_ipv4_output(void *priv, + struct sk_buff *skb, + const struct nf_hook_state *state) +{ + struct sock *sk = skb_to_full_sk(skb); + struct socket_smack *ssp; + struct smack_known *skp; + + if (sk && sk->sk_security) { + ssp = sk->sk_security; + skp = ssp->smk_out; + skb->secmark = skp->smk_secid; + } + + return NF_ACCEPT; +} + +static const struct nf_hook_ops smack_nf_ops[] = { + { + .hook = smack_ipv4_output, + .pf = NFPROTO_IPV4, + .hooknum = NF_INET_LOCAL_OUT, + .priority = NF_IP_PRI_SELINUX_FIRST, + }, +#if IS_ENABLED(CONFIG_IPV6) + { + .hook = smack_ipv6_output, + .pf = NFPROTO_IPV6, + .hooknum = NF_INET_LOCAL_OUT, + .priority = NF_IP6_PRI_SELINUX_FIRST, + }, +#endif /* IPV6 */ +}; + +static int __net_init smack_nf_register(struct net *net) +{ + return nf_register_net_hooks(net, smack_nf_ops, + ARRAY_SIZE(smack_nf_ops)); +} + +static void __net_exit smack_nf_unregister(struct net *net) +{ + nf_unregister_net_hooks(net, smack_nf_ops, ARRAY_SIZE(smack_nf_ops)); +} + +static struct pernet_operations smack_net_ops = { + .init = smack_nf_register, + .exit = smack_nf_unregister, +}; + +static int __init smack_nf_ip_init(void) +{ + if (smack_enabled == 0) + return 0; + + printk(KERN_DEBUG "Smack: Registering netfilter hooks\n"); + return register_pernet_subsys(&smack_net_ops); +} + +__initcall(smack_nf_ip_init); |