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Alex Lu 0f7bffd40a Bluetooth: Add more enc key size check 
commit 04a342cc49a8522e99c9b3346371c329d841dcd2 upstream.

When we are slave role and receives l2cap conn req when encryption has
started, we should check the enc key size to avoid KNOB attack or BLUFFS
attack.
From SIG recommendation, implementations are advised to reject
service-level connections on an encrypted baseband link with key
strengths below 7 octets.
A simple and clear way to achieve this is to place the enc key size
check in hci_cc_read_enc_key_size()

The btmon log below shows the case that lacks enc key size check.

> HCI Event: Connect Request (0x04) plen 10
        Address: BB:22:33:44:55:99 (OUI BB-22-33)
        Class: 0x480104
          Major class: Computer (desktop, notebook, PDA, organizers)
          Minor class: Desktop workstation
          Capturing (Scanner, Microphone)
          Telephony (Cordless telephony, Modem, Headset)
        Link type: ACL (0x01)
< HCI Command: Accept Connection Request (0x01|0x0009) plen 7
        Address: BB:22:33:44:55:99 (OUI BB-22-33)
        Role: Peripheral (0x01)
> HCI Event: Command Status (0x0f) plen 4
      Accept Connection Request (0x01|0x0009) ncmd 2
        Status: Success (0x00)
> HCI Event: Connect Complete (0x03) plen 11
        Status: Success (0x00)
        Handle: 1
        Address: BB:22:33:44:55:99 (OUI BB-22-33)
        Link type: ACL (0x01)
        Encryption: Disabled (0x00)
...

> HCI Event: Encryption Change (0x08) plen 4
        Status: Success (0x00)
        Handle: 1 Address: BB:22:33:44:55:99 (OUI BB-22-33)
        Encryption: Enabled with E0 (0x01)
< HCI Command: Read Encryption Key Size (0x05|0x0008) plen 2
        Handle: 1 Address: BB:22:33:44:55:99 (OUI BB-22-33)
> HCI Event: Command Complete (0x0e) plen 7
      Read Encryption Key Size (0x05|0x0008) ncmd 2
        Status: Success (0x00)
        Handle: 1 Address: BB:22:33:44:55:99 (OUI BB-22-33)
        Key size: 6
// We should check the enc key size
...

> ACL Data RX: Handle 1 flags 0x02 dlen 12
      L2CAP: Connection Request (0x02) ident 3 len 4
        PSM: 25 (0x0019)
        Source CID: 64
< ACL Data TX: Handle 1 flags 0x00 dlen 16
      L2CAP: Connection Response (0x03) ident 3 len 8
        Destination CID: 64
        Source CID: 64
        Result: Connection pending (0x0001)
        Status: Authorization pending (0x0002)
> HCI Event: Number of Completed Packets (0x13) plen 5
        Num handles: 1
        Handle: 1 Address: BB:22:33:44:55:99 (OUI BB-22-33)
        Count: 1
        #35: len 16 (25 Kb/s)
        Latency: 5 msec (2-7 msec ~4 msec)
< ACL Data TX: Handle 1 flags 0x00 dlen 16
      L2CAP: Connection Response (0x03) ident 3 len 8
        Destination CID: 64
        Source CID: 64
        Result: Connection successful (0x0000)
        Status: No further information available (0x0000)

Cc: stable@vger.kernel.org
Signed-off-by: Alex Lu <alex_lu@realsil.com.cn>
Signed-off-by: Max Chou <max.chou@realtek.com>
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2024-01-01 12:39:03 +00:00
..
bnep bluetooth: Use netif_rx(). 2022-03-07 11:40:41 +00:00
cmtp Merge branch 'signal-for-v5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace 2022-01-17 05:49:30 +02:00
hidp Bluetooth: Fix race condition in hidp_session_thread 2023-04-20 12:35:06 +02:00
rfcomm Bluetooth: Fix possible deadlock in rfcomm_sk_state_change 2023-02-01 08:34:22 +01:00
6lowpan.c use less confusing names for iov_iter direction initializers 2023-02-09 11:28:04 +01:00
a2mp.c use less confusing names for iov_iter direction initializers 2023-02-09 11:28:04 +01:00
a2mp.h
af_bluetooth.c Bluetooth: af_bluetooth: Fix Use-After-Free in bt_sock_recvmsg 2024-01-01 12:39:03 +00:00
amp.c
amp.h
aosp.c Bluetooth: Fix null pointer deref on unexpected status event 2022-08-08 17:04:37 -07:00
aosp.h Bluetooth: aosp: Support AOSP Bluetooth Quality Report 2021-11-02 19:37:52 +01:00
ecdh_helper.c
ecdh_helper.h
eir.c Bluetooth: Add initial implementation of BIS connections 2022-07-22 17:13:56 -07:00
eir.h Bluetooth: Add initial implementation of BIS connections 2022-07-22 17:13:56 -07:00
hci_codec.c Bluetooth: Fix support for Read Local Supported Codecs V2 2022-12-02 13:09:31 -08:00
hci_codec.h Bluetooth: Add support for Read Local Supported Codecs V2 2021-09-07 14:09:18 -07:00
hci_conn.c Bluetooth: Fix double free in hci_conn_cleanup 2023-11-28 17:06:56 +00:00
hci_core.c Bluetooth: hci_core: Fix build warnings 2023-10-25 12:03:10 +02:00
hci_debugfs.c Bluetooth: hci_debugfs: Fix not checking conn->debugfs 2022-09-21 15:01:21 -07:00
hci_debugfs.h Bluetooth: hci_core: Move all debugfs handling to hci_debugfs.c 2021-09-22 16:17:13 +02:00
hci_event.c Bluetooth: Add more enc key size check 2024-01-01 12:39:03 +00:00
hci_request.c Bluetooth: silence a dmesg error message in hci_request.c 2022-12-02 13:09:30 -08:00
hci_request.h Bluetooth: Delete unused hci_req_prepare_suspend() declaration 2023-10-10 22:00:40 +02:00
hci_sock.c Bluetooth: hci_sock: Correctly bounds check and pad HCI_MON_NEW_INDEX name 2023-10-25 12:03:16 +02:00
hci_sync.c Bluetooth: hci_sync: Fix Opcode prints in bt_dev_dbg/err 2023-11-20 11:51:55 +01:00
hci_sysfs.c Bluetooth: Fix double free in hci_conn_cleanup 2023-11-28 17:06:56 +00:00
iso.c Bluetooth: ISO: Fix handling of listen for unicast 2023-10-10 22:00:40 +02:00
Kconfig Bluetooth: Add initial implementation of CIS connections 2022-07-22 17:13:22 -07:00
l2cap_core.c Bluetooth: L2CAP: Send reject on command corrupted request 2024-01-01 12:39:03 +00:00
l2cap_sock.c Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_ready_cb 2023-08-11 12:08:23 +02:00
leds.c
leds.h
lib.c Bluetooth: Fix EALREADY and ELOOP cases in bt_status() 2022-12-31 13:32:28 +01:00
Makefile Bluetooth: Add BTPROTO_ISO socket type 2022-07-22 17:13:39 -07:00
mgmt.c Bluetooth: MGMT/SMP: Fix address type when using SMP over BREDR/LE 2024-01-01 12:39:03 +00:00
mgmt_config.c
mgmt_config.h
mgmt_util.c Bluetooth: Implement support for Mesh 2022-09-06 13:18:24 -07:00
mgmt_util.h Bluetooth: Fix a buffer overflow in mgmt_mesh_add() 2023-02-01 08:34:21 +01:00
msft.c Bluetooth: Fix null pointer deref on unexpected status event 2022-08-08 17:04:37 -07:00
msft.h Bluetooth: hci_sync: Refactor remove Adv Monitor 2022-07-21 17:14:55 -07:00
sco.c net: annotate data-races around sk->sk_lingertime 2023-09-13 09:42:33 +02:00
selftest.c
selftest.h
smp.c Bluetooth: MGMT/SMP: Fix address type when using SMP over BREDR/LE 2024-01-01 12:39:03 +00:00
smp.h