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aha/net/bluetooth/af_bluetooth.c
Marcel Holtmann e7c29cb16c [Bluetooth] Reject L2CAP connections on an insecure ACL link 
The Security Mode 4 of the Bluetooth 2.1 specification has strict
authentication and encryption requirements. It is the initiators job
to create a secure ACL link. However in case of malicious devices, the
acceptor has to make sure that the ACL is encrypted before allowing
any kind of L2CAP connection. The only exception here is the PSM 1 for
the service discovery protocol, because that is allowed to run on an
insecure ACL link.

Previously it was enough to reject a L2CAP connection during the
connection setup phase, but with Bluetooth 2.1 it is forbidden to
do any L2CAP protocol exchange on an insecure link (except SDP).

The new hci_conn_check_link_mode() function can be used to check the
integrity of an ACL link. This functions also takes care of the cases
where Security Mode 4 is disabled or one of the devices is based on
an older specification.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
2008-09-09 07:19:20 +02:00

463 lines
9.9 KiB
C
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/*
BlueZ - Bluetooth protocol stack for Linux
Copyright (C) 2000-2001 Qualcomm Incorporated
Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License version 2 as
published by the Free Software Foundation;
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
SOFTWARE IS DISCLAIMED.
*/
/* Bluetooth address family and sockets. */
#include <linux/module.h>
#include <linux/types.h>
#include <linux/list.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/init.h>
#include <linux/poll.h>
#include <net/sock.h>
#include <asm/ioctls.h>
#if defined(CONFIG_KMOD)
#include <linux/kmod.h>
#endif
#include <net/bluetooth/bluetooth.h>
#ifndef CONFIG_BT_SOCK_DEBUG
#undef BT_DBG
#define BT_DBG(D...)
#endif
#define VERSION "2.13"
/* Bluetooth sockets */
#define BT_MAX_PROTO 8
static struct net_proto_family *bt_proto[BT_MAX_PROTO];
static struct lock_class_key bt_slock_key[BT_MAX_PROTO];
static struct lock_class_key bt_lock_key[BT_MAX_PROTO];
static const char *bt_key_strings[BT_MAX_PROTO] = {
"sk_lock-AF_BLUETOOTH-BTPROTO_L2CAP",
"sk_lock-AF_BLUETOOTH-BTPROTO_HCI",
"sk_lock-AF_BLUETOOTH-BTPROTO_SCO",
"sk_lock-AF_BLUETOOTH-BTPROTO_RFCOMM",
"sk_lock-AF_BLUETOOTH-BTPROTO_BNEP",
"sk_lock-AF_BLUETOOTH-BTPROTO_CMTP",
"sk_lock-AF_BLUETOOTH-BTPROTO_HIDP",
"sk_lock-AF_BLUETOOTH-BTPROTO_AVDTP",
};
static const char *bt_slock_key_strings[BT_MAX_PROTO] = {
"slock-AF_BLUETOOTH-BTPROTO_L2CAP",
"slock-AF_BLUETOOTH-BTPROTO_HCI",
"slock-AF_BLUETOOTH-BTPROTO_SCO",
"slock-AF_BLUETOOTH-BTPROTO_RFCOMM",
"slock-AF_BLUETOOTH-BTPROTO_BNEP",
"slock-AF_BLUETOOTH-BTPROTO_CMTP",
"slock-AF_BLUETOOTH-BTPROTO_HIDP",
"slock-AF_BLUETOOTH-BTPROTO_AVDTP",
};
static DEFINE_RWLOCK(bt_proto_lock);
int bt_sock_register(int proto, struct net_proto_family *ops)
{
int err = 0;
if (proto < 0 || proto >= BT_MAX_PROTO)
return -EINVAL;
write_lock(&bt_proto_lock);
if (bt_proto[proto])
err = -EEXIST;
else
bt_proto[proto] = ops;
write_unlock(&bt_proto_lock);
return err;
}
EXPORT_SYMBOL(bt_sock_register);
int bt_sock_unregister(int proto)
{
int err = 0;
if (proto < 0 || proto >= BT_MAX_PROTO)
return -EINVAL;
write_lock(&bt_proto_lock);
if (!bt_proto[proto])
err = -ENOENT;
else
bt_proto[proto] = NULL;
write_unlock(&bt_proto_lock);
return err;
}
EXPORT_SYMBOL(bt_sock_unregister);
static void bt_reclassify_sock_lock(struct socket *sock, int proto)
{
struct sock *sk = sock->sk;
if (!sk)
return;
BUG_ON(sock_owned_by_user(sk));
sock_lock_init_class_and_name(sk,
bt_slock_key_strings[proto],
&bt_slock_key[proto],
bt_key_strings[proto],
&bt_lock_key[proto]);
}
static int bt_sock_create(struct net *net, struct socket *sock, int proto)
{
int err;
if (net != &init_net)
return -EAFNOSUPPORT;
if (proto < 0 || proto >= BT_MAX_PROTO)
return -EINVAL;
#if defined(CONFIG_KMOD)
if (!bt_proto[proto]) {
request_module("bt-proto-%d", proto);
}
#endif
err = -EPROTONOSUPPORT;
read_lock(&bt_proto_lock);
if (bt_proto[proto] && try_module_get(bt_proto[proto]->owner)) {
err = bt_proto[proto]->create(net, sock, proto);
bt_reclassify_sock_lock(sock, proto);
module_put(bt_proto[proto]->owner);
}
read_unlock(&bt_proto_lock);
return err;
}
void bt_sock_link(struct bt_sock_list *l, struct sock *sk)
{
write_lock_bh(&l->lock);
sk_add_node(sk, &l->head);
write_unlock_bh(&l->lock);
}
EXPORT_SYMBOL(bt_sock_link);
void bt_sock_unlink(struct bt_sock_list *l, struct sock *sk)
{
write_lock_bh(&l->lock);
sk_del_node_init(sk);
write_unlock_bh(&l->lock);
}
EXPORT_SYMBOL(bt_sock_unlink);
void bt_accept_enqueue(struct sock *parent, struct sock *sk)
{
BT_DBG("parent %p, sk %p", parent, sk);
sock_hold(sk);
list_add_tail(&bt_sk(sk)->accept_q, &bt_sk(parent)->accept_q);
bt_sk(sk)->parent = parent;
parent->sk_ack_backlog++;
}
EXPORT_SYMBOL(bt_accept_enqueue);
void bt_accept_unlink(struct sock *sk)
{
BT_DBG("sk %p state %d", sk, sk->sk_state);
list_del_init(&bt_sk(sk)->accept_q);
bt_sk(sk)->parent->sk_ack_backlog--;
bt_sk(sk)->parent = NULL;
sock_put(sk);
}
EXPORT_SYMBOL(bt_accept_unlink);
struct sock *bt_accept_dequeue(struct sock *parent, struct socket *newsock)
{
struct list_head *p, *n;
struct sock *sk;
BT_DBG("parent %p", parent);
list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
lock_sock(sk);
/* FIXME: Is this check still needed */
if (sk->sk_state == BT_CLOSED) {
release_sock(sk);
bt_accept_unlink(sk);
continue;
}
if (sk->sk_state == BT_CONNECTED || !newsock) {
bt_accept_unlink(sk);
if (newsock)
sock_graft(sk, newsock);
release_sock(sk);
return sk;
}
release_sock(sk);
}
return NULL;
}
EXPORT_SYMBOL(bt_accept_dequeue);
int bt_sock_recvmsg(struct kiocb *iocb, struct socket *sock,
struct msghdr *msg, size_t len, int flags)
{
int noblock = flags & MSG_DONTWAIT;
struct sock *sk = sock->sk;
struct sk_buff *skb;
size_t copied;
int err;
BT_DBG("sock %p sk %p len %d", sock, sk, len);
if (flags & (MSG_OOB))
return -EOPNOTSUPP;
if (!(skb = skb_recv_datagram(sk, flags, noblock, &err))) {
if (sk->sk_shutdown & RCV_SHUTDOWN)
return 0;
return err;
}
msg->msg_namelen = 0;
copied = skb->len;
if (len < copied) {
msg->msg_flags |= MSG_TRUNC;
copied = len;
}
skb_reset_transport_header(skb);
err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
if (err == 0)
sock_recv_timestamp(msg, sk, skb);
skb_free_datagram(sk, skb);
return err ? : copied;
}
EXPORT_SYMBOL(bt_sock_recvmsg);
static inline unsigned int bt_accept_poll(struct sock *parent)
{
struct list_head *p, *n;
struct sock *sk;
list_for_each_safe(p, n, &bt_sk(parent)->accept_q) {
sk = (struct sock *) list_entry(p, struct bt_sock, accept_q);
if (sk->sk_state == BT_CONNECTED)
return POLLIN | POLLRDNORM;
}
return 0;
}
unsigned int bt_sock_poll(struct file * file, struct socket *sock, poll_table *wait)
{
struct sock *sk = sock->sk;
unsigned int mask = 0;
BT_DBG("sock %p, sk %p", sock, sk);
poll_wait(file, sk->sk_sleep, wait);
if (sk->sk_state == BT_LISTEN)
return bt_accept_poll(sk);
if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue))
mask |= POLLERR;
if (sk->sk_shutdown & RCV_SHUTDOWN)
mask |= POLLRDHUP;
if (sk->sk_shutdown == SHUTDOWN_MASK)
mask |= POLLHUP;
if (!skb_queue_empty(&sk->sk_receive_queue) ||
(sk->sk_shutdown & RCV_SHUTDOWN))
mask |= POLLIN | POLLRDNORM;
if (sk->sk_state == BT_CLOSED)
mask |= POLLHUP;
if (sk->sk_state == BT_CONNECT ||
sk->sk_state == BT_CONNECT2 ||
sk->sk_state == BT_CONFIG)
return mask;
if (sock_writeable(sk))
mask |= POLLOUT | POLLWRNORM | POLLWRBAND;
else
set_bit(SOCK_ASYNC_NOSPACE, &sk->sk_socket->flags);
return mask;
}
EXPORT_SYMBOL(bt_sock_poll);
int bt_sock_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
struct sock *sk = sock->sk;
struct sk_buff *skb;
long amount;
int err;
BT_DBG("sk %p cmd %x arg %lx", sk, cmd, arg);
switch (cmd) {
case TIOCOUTQ:
if (sk->sk_state == BT_LISTEN)
return -EINVAL;
amount = sk->sk_sndbuf - atomic_read(&sk->sk_wmem_alloc);
if (amount < 0)
amount = 0;
err = put_user(amount, (int __user *) arg);
break;
case TIOCINQ:
if (sk->sk_state == BT_LISTEN)
return -EINVAL;
lock_sock(sk);
skb = skb_peek(&sk->sk_receive_queue);
amount = skb ? skb->len : 0;
release_sock(sk);
err = put_user(amount, (int __user *) arg);
break;
case SIOCGSTAMP:
err = sock_get_timestamp(sk, (struct timeval __user *) arg);
break;
case SIOCGSTAMPNS:
err = sock_get_timestampns(sk, (struct timespec __user *) arg);
break;
default:
err = -ENOIOCTLCMD;
break;
}
return err;
}
EXPORT_SYMBOL(bt_sock_ioctl);
int bt_sock_wait_state(struct sock *sk, int state, unsigned long timeo)
{
DECLARE_WAITQUEUE(wait, current);
int err = 0;
BT_DBG("sk %p", sk);
add_wait_queue(sk->sk_sleep, &wait);
while (sk->sk_state != state) {
set_current_state(TASK_INTERRUPTIBLE);
if (!timeo) {
err = -EINPROGRESS;
break;
}
if (signal_pending(current)) {
err = sock_intr_errno(timeo);
break;
}
release_sock(sk);
timeo = schedule_timeout(timeo);
lock_sock(sk);
err = sock_error(sk);
if (err)
break;
}
set_current_state(TASK_RUNNING);
remove_wait_queue(sk->sk_sleep, &wait);
return err;
}
EXPORT_SYMBOL(bt_sock_wait_state);
static struct net_proto_family bt_sock_family_ops = {
.owner = THIS_MODULE,
.family = PF_BLUETOOTH,
.create = bt_sock_create,
};
static int __init bt_init(void)
{
int err;
BT_INFO("Core ver %s", VERSION);
err = bt_sysfs_init();
if (err < 0)
return err;
err = sock_register(&bt_sock_family_ops);
if (err < 0) {
bt_sysfs_cleanup();
return err;
}
BT_INFO("HCI device and connection manager initialized");
hci_sock_init();
return 0;
}
static void __exit bt_exit(void)
{
hci_sock_cleanup();
sock_unregister(PF_BLUETOOTH);
bt_sysfs_cleanup();
}
subsys_initcall(bt_init);
module_exit(bt_exit);
MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
MODULE_DESCRIPTION("Bluetooth Core ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
MODULE_ALIAS_NETPROTO(PF_BLUETOOTH);
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