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@xxxxxxxxxxxx>
Reviewed-by: Alain Michaud <alainm@xxxxxxxxxxxx>
---
include/net/bluetooth/mgmt.h | 7 +++++
net/bluetooth/mgmt.c | 53 ++++++++++++++++++++++++++++++++++++
2 files changed, 60 insertions(+)
diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index f41cd87550dc..65dd6fd1fff3 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -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;
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 6552003a170e..7b9eac339c87 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -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 @@ static int set_wideband_speech(struct sock *sk, struct hci_dev *hdev,
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)
--
2.25.1
