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Bluetooth: Add support for reading security information 

To allow userspace to make correcty security policy decision, the kernel
needs to export a few details of the supported security features and
encryption key size information. This command exports this information
and also allows future extensions if needed.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Reviewed-by: Alain Michaud <alainm@chromium.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Marcel Holtmann 2020-04-03 21:44:05 +02:00 committed by Johan Hedberg
parent a479036041
commit bc292258c5
2 changed files with 60 additions and 0 deletions
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7
include/net/bluetooth/mgmt.h
View File

@ -674,6 +674,13 @@ struct mgmt_cp_set_blocked_keys {
#define MGMT_OP_SET_WIDEBAND_SPEECH 0x0047
#define MGMT_OP_READ_SECURITY_INFO 0x0048
#define MGMT_READ_SECURITY_INFO_SIZE 0
struct mgmt_rp_read_security_info {
__le16 sec_len;
__u8 sec[0];
} __packed;
#define MGMT_EV_CMD_COMPLETE 0x0001
struct mgmt_ev_cmd_complete {
__le16 opcode;

53
net/bluetooth/mgmt.c
View File

@ -108,6 +108,7 @@ static const u16 mgmt_commands[] = {
MGMT_OP_SET_APPEARANCE,
MGMT_OP_SET_BLOCKED_KEYS,
MGMT_OP_SET_WIDEBAND_SPEECH,
MGMT_OP_READ_SECURITY_INFO,
};
static const u16 mgmt_events[] = {
@ -155,6 +156,7 @@ static const u16 mgmt_untrusted_commands[] = {
MGMT_OP_READ_CONFIG_INFO,
MGMT_OP_READ_EXT_INDEX_LIST,
MGMT_OP_READ_EXT_INFO,
MGMT_OP_READ_SECURITY_INFO,
};
static const u16 mgmt_untrusted_events[] = {
@ -3659,6 +3661,55 @@ unlock:
return err;
}
static int read_security_info(struct sock *sk, struct hci_dev *hdev,
void *data, u16 data_len)
{
char buf[16];
struct mgmt_rp_read_security_info *rp = (void *)buf;
u16 sec_len = 0;
u8 flags = 0;
bt_dev_dbg(hdev, "sock %p", sk);
memset(&buf, 0, sizeof(buf));
hci_dev_lock(hdev);
/* When the Read Simple Pairing Options command is supported, then
* the remote public key validation is supported.
*/
if (hdev->commands[41] & 0x08)
flags |= 0x01; /* Remote public key validation (BR/EDR) */
flags |= 0x02; /* Remote public key validation (LE) */
/* When the Read Encryption Key Size command is supported, then the
* encryption key size is enforced.
*/
if (hdev->commands[20] & 0x10)
flags |= 0x04; /* Encryption key size enforcement (BR/EDR) */
flags |= 0x08; /* Encryption key size enforcement (LE) */
sec_len = eir_append_data(rp->sec, sec_len, 0x01, &flags, 1);
/* When the Read Simple Pairing Options command is supported, then
* also max encryption key size information is provided.
*/
if (hdev->commands[41] & 0x08)
sec_len = eir_append_le16(rp->sec, sec_len, 0x02,
hdev->max_enc_key_size);
sec_len = eir_append_le16(rp->sec, sec_len, 0x03, SMP_MAX_ENC_KEY_SIZE);
rp->sec_len = cpu_to_le16(sec_len);
hci_dev_unlock(hdev);
return mgmt_cmd_complete(sk, hdev->id, MGMT_OP_READ_SECURITY_INFO, 0,
rp, sizeof(*rp) + sec_len);
}
static void read_local_oob_data_complete(struct hci_dev *hdev, u8 status,
u16 opcode, struct sk_buff *skb)
{
@ -7099,6 +7150,8 @@ static const struct hci_mgmt_handler mgmt_handlers[] = {
{ set_blocked_keys, MGMT_OP_SET_BLOCKED_KEYS_SIZE,
HCI_MGMT_VAR_LEN },
{ set_wideband_speech, MGMT_SETTING_SIZE },
{ read_security_info, MGMT_READ_SECURITY_INFO_SIZE,
HCI_MGMT_UNTRUSTED },
};
void mgmt_index_added(struct hci_dev *hdev)