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Bluetooth: Add MITM mechanism to LE-SMP

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To achive Man-In-The-Middle (MITM) level security with Low Energy,
we have to enable User Passkey Comparison.  This commit modifies the
hard-coded JUST-WORKS pairing mechanism to support query via the MGMT
interface of Passkey comparison and User Confirmation.

Signed-off-by: Brian Gix <bgix@codeaurora.org>
Acked-by: Marcel Holtmann<marcel@holtmann.org>
Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
This commit is contained in:
Brian Gix
2011-12-21 16:12:12 -08:00
committed by Gustavo F. Padovan
parent 371fd83563
commit 2b64d153a0
3 changed files with 211 additions and 22 deletions
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1
include/net/bluetooth/hci_core.h
View File

@@ -310,6 +310,7 @@ struct hci_conn {
struct hci_dev *hdev;
void *l2cap_data;
void *sco_data;
void *smp_conn;
struct hci_conn *link;

6
include/net/bluetooth/smp.h
View File

@@ -115,6 +115,10 @@ struct smp_cmd_security_req {
#define SMP_MIN_ENC_KEY_SIZE 7
#define SMP_MAX_ENC_KEY_SIZE 16
#define SMP_FLAG_TK_VALID 1
#define SMP_FLAG_CFM_PENDING 2
#define SMP_FLAG_MITM_AUTH 3
struct smp_chan {
struct l2cap_conn *conn;
u8 preq[7]; /* SMP Pairing Request */
@@ -124,6 +128,7 @@ struct smp_chan {
u8 pcnf[16]; /* SMP Pairing Confirm */
u8 tk[16]; /* SMP Temporary Key */
u8 smp_key_size;
unsigned long smp_flags;
struct crypto_blkcipher *tfm;
struct work_struct confirm;
struct work_struct random;
@@ -134,6 +139,7 @@ struct smp_chan {
int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level);
int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb);
int smp_distribute_keys(struct l2cap_conn *conn, __u8 force);
int smp_user_confirm_reply(struct hci_conn *conn, u16 mgmt_op, __le32 passkey);
void smp_chan_destroy(struct l2cap_conn *conn);