• Luiz Augusto von Dentz's avatar
    Bluetooth: Disconnect if E0 is used for Level 4 · 8746f135
    Luiz Augusto von Dentz authored
    E0 is not allowed with Level 4:
    
    BLUETOOTH CORE SPECIFICATION Version 5.2 | Vol 3, Part C page 1319:
    
      '128-bit equivalent strength for link and encryption keys
       required using FIPS approved algorithms (E0 not allowed,
       SAFER+ not allowed, and P-192 not allowed; encryption key
       not shortened'
    
    SC enabled:
    
    > HCI Event: Read Remote Extended Features (0x23) plen 13
            Status: Success (0x00)
            Handle: 256
            Page: 1/2
            Features: 0x0b 0x00 0x00 0x00 0x00 0x00 0x00 0x00
              Secure Simple Pairing (Host Support)
              LE Supported (Host)
              Secure Connections (Host Support)
    > HCI Event: Encryption Change (0x08) plen 4
            Status: Success (0x00)
            Handle: 256
            Encryption: Enabled with AES-CCM (0x02)
    
    SC disabled:
    
    > HCI Event: Read Remote Extended Features (0x23) plen 13
            Status: Success (0x00)
            Handle: 256
            Page: 1/2
            Features: 0x03 0x00 0x00 0x00 0x00 0x00 0x00 0x00
              Secure Simple Pairing (Host Support)
              LE Supported (Host)
    > HCI Event: Encryption Change (0x08) plen 4
            Status: Success (0x00)
            Handle: 256
            Encryption: Enabled with E0 (0x01)
    [May 8 20:23] Bluetooth: hci0: Invalid security: expect AES but E0 was used
    < HCI Command: Disconnect (0x01|0x0006) plen 3
            Handle: 256
            Reason: Authentication Failure (0x05)
    Signed-off-by: default avatarLuiz Augusto von Dentz <luiz.von.dentz@intel.com>
    Signed-off-by: default avatarMarcel Holtmann <marcel@holtmann.org>
    8746f135
hci_event.c 148 KB