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audit: add netlink audit protocol bind to check capabilities on multicast join

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Register a netlink per-protocol bind fuction for audit to check userspace
process capabilities before allowing a multicast group connection.

Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Richard Guy Briggs 2014-04-22 21:31:56 -04:00 committed by David S. Miller
parent 7774d5e03f
commit 3a101b8de0
3 changed files with 17 additions and 2 deletions
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7
include/uapi/linux/capability.h
View File

@ -347,7 +347,12 @@ struct vfs_cap_data {
#define CAP_BLOCK_SUSPEND 36
#define CAP_LAST_CAP CAP_BLOCK_SUSPEND
/* Allow reading the audit log via multicast netlink socket */
#define CAP_AUDIT_READ 37
#define CAP_LAST_CAP CAP_AUDIT_READ
#define cap_valid(x) ((x) >= 0 && (x) <= CAP_LAST_CAP)

10
kernel/audit.c
View File

@ -1076,10 +1076,20 @@ static void audit_receive(struct sk_buff *skb)
mutex_unlock(&audit_cmd_mutex);
}
/* Run custom bind function on netlink socket group connect or bind requests. */
static int audit_bind(int group)
{
if (!capable(CAP_AUDIT_READ))
return -EPERM;
return 0;
}
static int __net_init audit_net_init(struct net *net)
{
struct netlink_kernel_cfg cfg = {
.input = audit_receive,
.bind = audit_bind,
};
struct audit_net *aunet = net_generic(net, audit_net_id);

2
security/selinux/include/classmap.h
View File

@ -147,7 +147,7 @@ struct security_class_mapping secclass_map[] = {
{ "peer", { "recv", NULL } },
{ "capability2",
{ "mac_override", "mac_admin", "syslog", "wake_alarm", "block_suspend",
NULL } },
"audit_read", NULL } },
{ "kernel_service", { "use_as_override", "create_files_as", NULL } },
{ "tun_socket",
{ COMMON_SOCK_PERMS, "attach_queue", NULL } },