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Diffstat (limited to 'net/bluetooth/smp.c')
-rw-r--r--net/bluetooth/smp.c169
1 files changed, 88 insertions, 81 deletions
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index dfb4e1161c10..f2829a7932e2 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -35,6 +35,33 @@
#define AUTH_REQ_MASK 0x07
+#define SMP_FLAG_TK_VALID 1
+#define SMP_FLAG_CFM_PENDING 2
+#define SMP_FLAG_MITM_AUTH 3
+#define SMP_FLAG_COMPLETE 4
+#define SMP_FLAG_INITIATOR 5
+
+struct smp_chan {
+ struct l2cap_conn *conn;
+ u8 preq[7]; /* SMP Pairing Request */
+ u8 prsp[7]; /* SMP Pairing Response */
+ u8 prnd[16]; /* SMP Pairing Random (local) */
+ u8 rrnd[16]; /* SMP Pairing Random (remote) */
+ u8 pcnf[16]; /* SMP Pairing Confirm */
+ u8 tk[16]; /* SMP Temporary Key */
+ u8 enc_key_size;
+ u8 remote_key_dist;
+ bdaddr_t id_addr;
+ u8 id_addr_type;
+ u8 irk[16];
+ struct smp_csrk *csrk;
+ struct smp_csrk *slave_csrk;
+ struct smp_ltk *ltk;
+ struct smp_ltk *slave_ltk;
+ struct smp_irk *remote_irk;
+ unsigned long flags;
+};
+
static inline void swap128(const u8 src[16], u8 dst[16])
{
int i;
@@ -369,7 +396,7 @@ static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
/* Initialize key for JUST WORKS */
memset(smp->tk, 0, sizeof(smp->tk));
- clear_bit(SMP_FLAG_TK_VALID, &smp->smp_flags);
+ clear_bit(SMP_FLAG_TK_VALID, &smp->flags);
BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io);
@@ -388,19 +415,18 @@ static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
method = JUST_WORKS;
/* Don't confirm locally initiated pairing attempts */
- if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR,
- &smp->smp_flags))
+ if (method == JUST_CFM && test_bit(SMP_FLAG_INITIATOR, &smp->flags))
method = JUST_WORKS;
/* If Just Works, Continue with Zero TK */
if (method == JUST_WORKS) {
- set_bit(SMP_FLAG_TK_VALID, &smp->smp_flags);
+ set_bit(SMP_FLAG_TK_VALID, &smp->flags);
return 0;
}
/* Not Just Works/Confirm results in MITM Authentication */
if (method != JUST_CFM)
- set_bit(SMP_FLAG_MITM_AUTH, &smp->smp_flags);
+ set_bit(SMP_FLAG_MITM_AUTH, &smp->flags);
/* If both devices have Keyoard-Display I/O, the master
* Confirms and the slave Enters the passkey.
@@ -419,7 +445,7 @@ static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
passkey %= 1000000;
put_unaligned_le32(passkey, smp->tk);
BT_DBG("PassKey: %d", passkey);
- set_bit(SMP_FLAG_TK_VALID, &smp->smp_flags);
+ set_bit(SMP_FLAG_TK_VALID, &smp->flags);
}
hci_dev_lock(hcon->hdev);
@@ -441,15 +467,13 @@ static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
return ret;
}
-static void confirm_work(struct work_struct *work)
+static u8 smp_confirm(struct smp_chan *smp)
{
- struct smp_chan *smp = container_of(work, struct smp_chan, confirm);
struct l2cap_conn *conn = smp->conn;
struct hci_dev *hdev = conn->hcon->hdev;
struct crypto_blkcipher *tfm = hdev->tfm_aes;
struct smp_cmd_pairing_confirm cp;
int ret;
- u8 reason;
BT_DBG("conn %p", conn);
@@ -463,35 +487,27 @@ static void confirm_work(struct work_struct *work)
hci_dev_unlock(hdev);
- if (ret) {
- reason = SMP_UNSPECIFIED;
- goto error;
- }
+ if (ret)
+ return SMP_UNSPECIFIED;
- clear_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags);
+ clear_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
- return;
-
-error:
- smp_failure(conn, reason);
+ return 0;
}
-static void random_work(struct work_struct *work)
+static u8 smp_random(struct smp_chan *smp)
{
- struct smp_chan *smp = container_of(work, struct smp_chan, random);
struct l2cap_conn *conn = smp->conn;
struct hci_conn *hcon = conn->hcon;
struct hci_dev *hdev = hcon->hdev;
struct crypto_blkcipher *tfm = hdev->tfm_aes;
- u8 reason, confirm[16];
+ u8 confirm[16];
int ret;
- if (IS_ERR_OR_NULL(tfm)) {
- reason = SMP_UNSPECIFIED;
- goto error;
- }
+ if (IS_ERR_OR_NULL(tfm))
+ return SMP_UNSPECIFIED;
BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
@@ -504,15 +520,12 @@ static void random_work(struct work_struct *work)
hci_dev_unlock(hdev);
- if (ret) {
- reason = SMP_UNSPECIFIED;
- goto error;
- }
+ if (ret)
+ return SMP_UNSPECIFIED;
if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) {
BT_ERR("Pairing failed (confirmation values mismatch)");
- reason = SMP_CONFIRM_FAILED;
- goto error;
+ return SMP_CONFIRM_FAILED;
}
if (hcon->out) {
@@ -525,15 +538,13 @@ static void random_work(struct work_struct *work)
memset(stk + smp->enc_key_size, 0,
SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size);
- if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) {
- reason = SMP_UNSPECIFIED;
- goto error;
- }
+ if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
+ return SMP_UNSPECIFIED;
hci_le_start_enc(hcon, ediv, rand, stk);
hcon->enc_key_size = smp->enc_key_size;
} else {
- u8 stk[16];
+ u8 stk[16], auth;
__le64 rand = 0;
__le16 ediv = 0;
@@ -545,15 +556,17 @@ static void random_work(struct work_struct *work)
memset(stk + smp->enc_key_size, 0,
SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size);
+ if (hcon->pending_sec_level == BT_SECURITY_HIGH)
+ auth = 1;
+ else
+ auth = 0;
+
hci_add_ltk(hcon->hdev, &hcon->dst, hcon->dst_type,
- HCI_SMP_STK_SLAVE, 0, stk, smp->enc_key_size,
+ HCI_SMP_STK_SLAVE, auth, stk, smp->enc_key_size,
ediv, rand);
}
- return;
-
-error:
- smp_failure(conn, reason);
+ return 0;
}
static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
@@ -564,9 +577,6 @@ static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
if (!smp)
return NULL;
- INIT_WORK(&smp->confirm, confirm_work);
- INIT_WORK(&smp->random, random_work);
-
smp->conn = conn;
conn->smp_chan = smp;
conn->hcon->smp_conn = conn;
@@ -583,7 +593,7 @@ void smp_chan_destroy(struct l2cap_conn *conn)
BUG_ON(!smp);
- complete = test_bit(SMP_FLAG_COMPLETE, &smp->smp_flags);
+ complete = test_bit(SMP_FLAG_COMPLETE, &smp->flags);
mgmt_smp_complete(conn->hcon, complete);
kfree(smp->csrk);
@@ -634,7 +644,7 @@ int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey)
put_unaligned_le32(value, smp->tk);
/* Fall Through */
case MGMT_OP_USER_CONFIRM_REPLY:
- set_bit(SMP_FLAG_TK_VALID, &smp->smp_flags);
+ set_bit(SMP_FLAG_TK_VALID, &smp->flags);
break;
case MGMT_OP_USER_PASSKEY_NEG_REPLY:
case MGMT_OP_USER_CONFIRM_NEG_REPLY:
@@ -646,8 +656,11 @@ int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey)
}
/* If it is our turn to send Pairing Confirm, do so now */
- if (test_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags))
- queue_work(hcon->hdev->workqueue, &smp->confirm);
+ if (test_bit(SMP_FLAG_CFM_PENDING, &smp->flags)) {
+ u8 rsp = smp_confirm(smp);
+ if (rsp)
+ smp_failure(conn, rsp);
+ }
return 0;
}
@@ -656,14 +669,13 @@ static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_pairing rsp, *req = (void *) skb->data;
struct smp_chan *smp;
- u8 key_size;
- u8 auth = SMP_AUTH_NONE;
+ u8 key_size, auth;
int ret;
BT_DBG("conn %p", conn);
if (skb->len < sizeof(*req))
- return SMP_UNSPECIFIED;
+ return SMP_INVALID_PARAMS;
if (conn->hcon->link_mode & HCI_LM_MASTER)
return SMP_CMD_NOTSUPP;
@@ -681,8 +693,7 @@ static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
skb_pull(skb, sizeof(*req));
/* We didn't start the pairing, so match remote */
- if (req->auth_req & SMP_AUTH_BONDING)
- auth = req->auth_req;
+ auth = req->auth_req;
conn->hcon->pending_sec_level = authreq_to_seclevel(auth);
@@ -704,7 +715,7 @@ static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
if (ret)
return SMP_UNSPECIFIED;
- clear_bit(SMP_FLAG_INITIATOR, &smp->smp_flags);
+ clear_bit(SMP_FLAG_INITIATOR, &smp->flags);
return 0;
}
@@ -713,14 +724,13 @@ static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_pairing *req, *rsp = (void *) skb->data;
struct smp_chan *smp = conn->smp_chan;
- struct hci_dev *hdev = conn->hcon->hdev;
u8 key_size, auth = SMP_AUTH_NONE;
int ret;
BT_DBG("conn %p", conn);
if (skb->len < sizeof(*rsp))
- return SMP_UNSPECIFIED;
+ return SMP_INVALID_PARAMS;
if (!(conn->hcon->link_mode & HCI_LM_MASTER))
return SMP_CMD_NOTSUPP;
@@ -753,11 +763,11 @@ static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
if (ret)
return SMP_UNSPECIFIED;
- set_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags);
+ set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
/* Can't compose response until we have been confirmed */
- if (test_bit(SMP_FLAG_TK_VALID, &smp->smp_flags))
- queue_work(hdev->workqueue, &smp->confirm);
+ if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
+ return smp_confirm(smp);
return 0;
}
@@ -765,12 +775,11 @@ static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_chan *smp = conn->smp_chan;
- struct hci_dev *hdev = conn->hcon->hdev;
BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
if (skb->len < sizeof(smp->pcnf))
- return SMP_UNSPECIFIED;
+ return SMP_INVALID_PARAMS;
memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf));
skb_pull(skb, sizeof(smp->pcnf));
@@ -778,10 +787,10 @@ static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
if (conn->hcon->out)
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(smp->prnd),
smp->prnd);
- else if (test_bit(SMP_FLAG_TK_VALID, &smp->smp_flags))
- queue_work(hdev->workqueue, &smp->confirm);
+ else if (test_bit(SMP_FLAG_TK_VALID, &smp->flags))
+ return smp_confirm(smp);
else
- set_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags);
+ set_bit(SMP_FLAG_CFM_PENDING, &smp->flags);
return 0;
}
@@ -789,19 +798,16 @@ static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_chan *smp = conn->smp_chan;
- struct hci_dev *hdev = conn->hcon->hdev;
BT_DBG("conn %p", conn);
if (skb->len < sizeof(smp->rrnd))
- return SMP_UNSPECIFIED;
+ return SMP_INVALID_PARAMS;
memcpy(smp->rrnd, skb->data, sizeof(smp->rrnd));
skb_pull(skb, sizeof(smp->rrnd));
- queue_work(hdev->workqueue, &smp->random);
-
- return 0;
+ return smp_random(smp);
}
static u8 smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level)
@@ -836,7 +842,7 @@ static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
BT_DBG("conn %p", conn);
if (skb->len < sizeof(*rp))
- return SMP_UNSPECIFIED;
+ return SMP_INVALID_PARAMS;
if (!(conn->hcon->link_mode & HCI_LM_MASTER))
return SMP_CMD_NOTSUPP;
@@ -861,7 +867,7 @@ static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
- clear_bit(SMP_FLAG_INITIATOR, &smp->smp_flags);
+ clear_bit(SMP_FLAG_INITIATOR, &smp->flags);
return 0;
}
@@ -908,10 +914,11 @@ int smp_conn_security(struct hci_conn *hcon, __u8 sec_level)
authreq = seclevel_to_authreq(sec_level);
- /* hcon->auth_type is set by pair_device in mgmt.c. If the MITM
- * flag is set we should also set it for the SMP request.
+ /* Require MITM if IO Capability allows or the security level
+ * requires it.
*/
- if ((hcon->auth_type & 0x01))
+ if (hcon->io_capability != HCI_IO_NO_INPUT_OUTPUT ||
+ sec_level > BT_SECURITY_MEDIUM)
authreq |= SMP_AUTH_MITM;
if (hcon->link_mode & HCI_LM_MASTER) {
@@ -928,7 +935,7 @@ int smp_conn_security(struct hci_conn *hcon, __u8 sec_level)
smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp);
}
- set_bit(SMP_FLAG_INITIATOR, &smp->smp_flags);
+ set_bit(SMP_FLAG_INITIATOR, &smp->flags);
done:
hcon->pending_sec_level = sec_level;
@@ -944,7 +951,7 @@ static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb)
BT_DBG("conn %p", conn);
if (skb->len < sizeof(*rp))
- return SMP_UNSPECIFIED;
+ return SMP_INVALID_PARAMS;
/* Ignore this PDU if it wasn't requested */
if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY))
@@ -969,7 +976,7 @@ static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb)
BT_DBG("conn %p", conn);
if (skb->len < sizeof(*rp))
- return SMP_UNSPECIFIED;
+ return SMP_INVALID_PARAMS;
/* Ignore this PDU if it wasn't requested */
if (!(smp->remote_key_dist & SMP_DIST_ENC_KEY))
@@ -1001,7 +1008,7 @@ static int smp_cmd_ident_info(struct l2cap_conn *conn, struct sk_buff *skb)
BT_DBG("");
if (skb->len < sizeof(*info))
- return SMP_UNSPECIFIED;
+ return SMP_INVALID_PARAMS;
/* Ignore this PDU if it wasn't requested */
if (!(smp->remote_key_dist & SMP_DIST_ID_KEY))
@@ -1025,7 +1032,7 @@ static int smp_cmd_ident_addr_info(struct l2cap_conn *conn,
BT_DBG("");
if (skb->len < sizeof(*info))
- return SMP_UNSPECIFIED;
+ return SMP_INVALID_PARAMS;
/* Ignore this PDU if it wasn't requested */
if (!(smp->remote_key_dist & SMP_DIST_ID_KEY))
@@ -1075,7 +1082,7 @@ static int smp_cmd_sign_info(struct l2cap_conn *conn, struct sk_buff *skb)
BT_DBG("conn %p", conn);
if (skb->len < sizeof(*rp))
- return SMP_UNSPECIFIED;
+ return SMP_INVALID_PARAMS;
/* Ignore this PDU if it wasn't requested */
if (!(smp->remote_key_dist & SMP_DIST_SIGN))
@@ -1358,7 +1365,7 @@ int smp_distribute_keys(struct l2cap_conn *conn)
clear_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags);
cancel_delayed_work_sync(&conn->security_timer);
- set_bit(SMP_FLAG_COMPLETE, &smp->smp_flags);
+ set_bit(SMP_FLAG_COMPLETE, &smp->flags);
smp_notify_keys(conn);
smp_chan_destroy(conn);
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