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Commit 3a101b8d authored by Richard Guy Briggs's avatar Richard Guy Briggs Committed by David S. Miller
Browse files

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



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

Signed-off-by: default avatarRichard Guy Briggs <rgb@redhat.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 7774d5e0

include/uapi/linux/capability.h

+6 −1
Original line number Diff line number Diff line
@@ -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)

kernel/audit.c

+10 −0
Original line number Diff line number Diff line
@@ -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);

security/selinux/include/classmap.h

+1 −1
Original line number Diff line number Diff line
@@ -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 } },