Commit 33faba7f authored by Richard Guy Briggs's avatar Richard Guy Briggs Committed by Eric Paris

audit: listen in all network namespaces

Convert audit from only listening in init_net to use register_pernet_subsys()
to dynamically manage the netlink socket list.
Signed-off-by: default avatarRichard Guy Briggs <rgb@redhat.com>
Signed-off-by: default avatarEric Paris <eparis@redhat.com>
parent 2f2ad101
......@@ -63,6 +63,7 @@
#include <linux/freezer.h>
#include <linux/tty.h>
#include <linux/pid_namespace.h>
#include <net/netns/generic.h>
#include "audit.h"
......@@ -121,6 +122,7 @@ static atomic_t audit_lost = ATOMIC_INIT(0);
/* The netlink socket. */
static struct sock *audit_sock;
int audit_net_id;
/* Hash for inode-based rules */
struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
......@@ -176,6 +178,7 @@ struct audit_buffer {
struct audit_reply {
__u32 portid;
pid_t pid;
struct sk_buff *skb;
};
......@@ -401,6 +404,7 @@ static void kauditd_send_skb(struct sk_buff *skb)
printk(KERN_ERR "audit: *NO* daemon at audit_pid=%d\n", audit_pid);
audit_log_lost("auditd disappeared\n");
audit_pid = 0;
audit_sock = NULL;
/* we might get lucky and get this in the next auditd */
audit_hold_skb(skb);
} else
......@@ -482,15 +486,16 @@ static int kauditd_thread(void *dummy)
int audit_send_list(void *_dest)
{
struct audit_netlink_list *dest = _dest;
__u32 portid = dest->portid;
struct sk_buff *skb;
struct net *net = get_net_ns_by_pid(dest->pid);
struct audit_net *aunet = net_generic(net, audit_net_id);
/* wait for parent to finish and send an ACK */
mutex_lock(&audit_cmd_mutex);
mutex_unlock(&audit_cmd_mutex);
while ((skb = __skb_dequeue(&dest->q)) != NULL)
netlink_unicast(audit_sock, skb, portid, 0);
netlink_unicast(aunet->nlsk, skb, dest->portid, 0);
kfree(dest);
......@@ -525,13 +530,15 @@ out_kfree_skb:
static int audit_send_reply_thread(void *arg)
{
struct audit_reply *reply = (struct audit_reply *)arg;
struct net *net = get_net_ns_by_pid(reply->pid);
struct audit_net *aunet = net_generic(net, audit_net_id);
mutex_lock(&audit_cmd_mutex);
mutex_unlock(&audit_cmd_mutex);
/* Ignore failure. It'll only happen if the sender goes away,
because our timeout is set to infinite. */
netlink_unicast(audit_sock, reply->skb, reply->portid, 0);
netlink_unicast(aunet->nlsk , reply->skb, reply->portid, 0);
kfree(reply);
return 0;
}
......@@ -564,6 +571,7 @@ static void audit_send_reply(__u32 portid, int seq, int type, int done,
goto out;
reply->portid = portid;
reply->pid = task_pid_vnr(current);
reply->skb = skb;
tsk = kthread_run(audit_send_reply_thread, reply, "audit_send_reply");
......@@ -791,6 +799,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
audit_log_config_change("audit_pid", new_pid, audit_pid, 1);
audit_pid = new_pid;
audit_nlk_portid = NETLINK_CB(skb).portid;
audit_sock = NETLINK_CB(skb).sk;
}
if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) {
err = audit_set_rate_limit(status_get->rate_limit);
......@@ -998,24 +1007,58 @@ static void audit_receive(struct sk_buff *skb)
mutex_unlock(&audit_cmd_mutex);
}
/* Initialize audit support at boot time. */
static int __init audit_init(void)
static int __net_init audit_net_init(struct net *net)
{
int i;
struct netlink_kernel_cfg cfg = {
.input = audit_receive,
};
struct audit_net *aunet = net_generic(net, audit_net_id);
pr_info("audit: initializing netlink socket in namespace\n");
aunet->nlsk = netlink_kernel_create(net, NETLINK_AUDIT, &cfg);
if (aunet->nlsk == NULL)
return -ENOMEM;
if (!aunet->nlsk)
audit_panic("cannot initialize netlink socket in namespace");
else
aunet->nlsk->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
return 0;
}
static void __net_exit audit_net_exit(struct net *net)
{
struct audit_net *aunet = net_generic(net, audit_net_id);
struct sock *sock = aunet->nlsk;
if (sock == audit_sock) {
audit_pid = 0;
audit_sock = NULL;
}
rcu_assign_pointer(aunet->nlsk, NULL);
synchronize_net();
netlink_kernel_release(sock);
}
static struct pernet_operations __net_initdata audit_net_ops = {
.init = audit_net_init,
.exit = audit_net_exit,
.id = &audit_net_id,
.size = sizeof(struct audit_net),
};
/* Initialize audit support at boot time. */
static int __init audit_init(void)
{
int i;
if (audit_initialized == AUDIT_DISABLED)
return 0;
printk(KERN_INFO "audit: initializing netlink socket (%s)\n",
pr_info("audit: initializing netlink subsys (%s)\n",
audit_default ? "enabled" : "disabled");
audit_sock = netlink_kernel_create(&init_net, NETLINK_AUDIT, &cfg);
if (!audit_sock)
audit_panic("cannot initialize netlink socket");
else
audit_sock->sk_sndtimeo = MAX_SCHEDULE_TIMEOUT;
register_pernet_subsys(&audit_net_ops);
skb_queue_head_init(&audit_skb_queue);
skb_queue_head_init(&audit_skb_hold_queue);
......
......@@ -247,11 +247,16 @@ extern void audit_panic(const char *message);
struct audit_netlink_list {
__u32 portid;
pid_t pid;
struct sk_buff_head q;
};
int audit_send_list(void *);
struct audit_net {
struct sock *nlsk;
};
extern int selinux_audit_rule_update(void);
extern struct mutex audit_filter_mutex;
......
......@@ -1050,6 +1050,7 @@ int audit_receive_filter(int type, __u32 portid, int seq, void *data,
if (!dest)
return -ENOMEM;
dest->portid = portid;
dest->pid = task_pid_vnr(current);
skb_queue_head_init(&dest->q);
mutex_lock(&audit_filter_mutex);
......
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