122 lines
2.3 KiB
C
122 lines
2.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Netlink event notifications for SELinux.
|
|
*
|
|
* Author: James Morris <jmorris@redhat.com>
|
|
*
|
|
* Copyright (C) 2004 Red Hat, Inc., James Morris <jmorris@redhat.com>
|
|
*/
|
|
#include <linux/init.h>
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/stddef.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/export.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/selinux_netlink.h>
|
|
#include <net/net_namespace.h>
|
|
#include <net/netlink.h>
|
|
|
|
#include "security.h"
|
|
|
|
static struct sock *selnl __ro_after_init;
|
|
|
|
static int selnl_msglen(int msgtype)
|
|
{
|
|
int ret = 0;
|
|
|
|
switch (msgtype) {
|
|
case SELNL_MSG_SETENFORCE:
|
|
ret = sizeof(struct selnl_msg_setenforce);
|
|
break;
|
|
|
|
case SELNL_MSG_POLICYLOAD:
|
|
ret = sizeof(struct selnl_msg_policyload);
|
|
break;
|
|
|
|
default:
|
|
BUG();
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
static void selnl_add_payload(struct nlmsghdr *nlh, int len, int msgtype, void *data)
|
|
{
|
|
switch (msgtype) {
|
|
case SELNL_MSG_SETENFORCE: {
|
|
struct selnl_msg_setenforce *msg = nlmsg_data(nlh);
|
|
|
|
memset(msg, 0, len);
|
|
msg->val = *((int *)data);
|
|
break;
|
|
}
|
|
|
|
case SELNL_MSG_POLICYLOAD: {
|
|
struct selnl_msg_policyload *msg = nlmsg_data(nlh);
|
|
|
|
memset(msg, 0, len);
|
|
msg->seqno = *((u32 *)data);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
BUG();
|
|
}
|
|
}
|
|
|
|
static void selnl_notify(int msgtype, void *data)
|
|
{
|
|
int len;
|
|
sk_buff_data_t tmp;
|
|
struct sk_buff *skb;
|
|
struct nlmsghdr *nlh;
|
|
|
|
len = selnl_msglen(msgtype);
|
|
|
|
skb = nlmsg_new(len, GFP_USER);
|
|
if (!skb)
|
|
goto oom;
|
|
|
|
tmp = skb->tail;
|
|
nlh = nlmsg_put(skb, 0, 0, msgtype, len, 0);
|
|
if (!nlh)
|
|
goto out_kfree_skb;
|
|
selnl_add_payload(nlh, len, msgtype, data);
|
|
nlh->nlmsg_len = skb->tail - tmp;
|
|
NETLINK_CB(skb).dst_group = SELNLGRP_AVC;
|
|
netlink_broadcast(selnl, skb, 0, SELNLGRP_AVC, GFP_USER);
|
|
out:
|
|
return;
|
|
|
|
out_kfree_skb:
|
|
kfree_skb(skb);
|
|
oom:
|
|
pr_err("SELinux: OOM in %s\n", __func__);
|
|
goto out;
|
|
}
|
|
|
|
void selnl_notify_setenforce(int val)
|
|
{
|
|
selnl_notify(SELNL_MSG_SETENFORCE, &val);
|
|
}
|
|
|
|
void selnl_notify_policyload(u32 seqno)
|
|
{
|
|
selnl_notify(SELNL_MSG_POLICYLOAD, &seqno);
|
|
}
|
|
|
|
static int __init selnl_init(void)
|
|
{
|
|
struct netlink_kernel_cfg cfg = {
|
|
.groups = SELNLGRP_MAX,
|
|
.flags = NL_CFG_F_NONROOT_RECV,
|
|
};
|
|
|
|
selnl = netlink_kernel_create(&init_net, NETLINK_SELINUX, &cfg);
|
|
if (selnl == NULL)
|
|
panic("SELinux: Cannot create netlink socket.");
|
|
return 0;
|
|
}
|
|
|
|
__initcall(selnl_init);
|