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Diffstat (limited to 'net/bluetooth/smp.c')
-rw-r--r--net/bluetooth/smp.c421
1 files changed, 254 insertions, 167 deletions
diff --git a/net/bluetooth/smp.c b/net/bluetooth/smp.c
index 391888b88a92..759b63572641 100644
--- a/net/bluetooth/smp.c
+++ b/net/bluetooth/smp.c
@@ -182,18 +182,9 @@ static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
return;
hci_send_acl(conn->hcon, skb, 0);
-}
-
-static __u8 seclevel_to_authreq(__u8 level)
-{
- switch (level) {
- case BT_SECURITY_HIGH:
- /* Right now we don't support bonding */
- return SMP_AUTH_MITM;
- default:
- return SMP_AUTH_NONE;
- }
+ mod_timer(&conn->security_timer, jiffies +
+ msecs_to_jiffies(SMP_TIMEOUT));
}
static void build_pairing_cmd(struct l2cap_conn *conn,
@@ -205,7 +196,7 @@ static void build_pairing_cmd(struct l2cap_conn *conn,
dist_keys = 0;
if (test_bit(HCI_PAIRABLE, &conn->hcon->hdev->flags)) {
- dist_keys = SMP_DIST_ENC_KEY | SMP_DIST_ID_KEY | SMP_DIST_SIGN;
+ dist_keys = SMP_DIST_ENC_KEY;
authreq |= SMP_AUTH_BONDING;
}
@@ -229,24 +220,184 @@ static void build_pairing_cmd(struct l2cap_conn *conn,
static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
{
+ struct smp_chan *smp = conn->smp_chan;
+
if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) ||
(max_key_size < SMP_MIN_ENC_KEY_SIZE))
return SMP_ENC_KEY_SIZE;
- conn->smp_key_size = max_key_size;
+ smp->smp_key_size = max_key_size;
return 0;
}
+static void confirm_work(struct work_struct *work)
+{
+ struct smp_chan *smp = container_of(work, struct smp_chan, confirm);
+ struct l2cap_conn *conn = smp->conn;
+ struct crypto_blkcipher *tfm;
+ struct smp_cmd_pairing_confirm cp;
+ int ret;
+ u8 res[16], reason;
+
+ BT_DBG("conn %p", conn);
+
+ tfm = crypto_alloc_blkcipher("ecb(aes)", 0, CRYPTO_ALG_ASYNC);
+ if (IS_ERR(tfm)) {
+ reason = SMP_UNSPECIFIED;
+ goto error;
+ }
+
+ smp->tfm = tfm;
+
+ if (conn->hcon->out)
+ ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp, 0,
+ conn->src, conn->hcon->dst_type, conn->dst,
+ res);
+ else
+ ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp,
+ conn->hcon->dst_type, conn->dst, 0, conn->src,
+ res);
+ if (ret) {
+ reason = SMP_UNSPECIFIED;
+ goto error;
+ }
+
+ swap128(res, cp.confirm_val);
+ smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
+
+ return;
+
+error:
+ smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), &reason);
+ smp_chan_destroy(conn);
+}
+
+static void random_work(struct work_struct *work)
+{
+ struct smp_chan *smp = container_of(work, struct smp_chan, random);
+ struct l2cap_conn *conn = smp->conn;
+ struct hci_conn *hcon = conn->hcon;
+ struct crypto_blkcipher *tfm = smp->tfm;
+ u8 reason, confirm[16], res[16], key[16];
+ int ret;
+
+ if (IS_ERR_OR_NULL(tfm)) {
+ reason = SMP_UNSPECIFIED;
+ goto error;
+ }
+
+ BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
+
+ if (hcon->out)
+ ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp, 0,
+ conn->src, hcon->dst_type, conn->dst,
+ res);
+ else
+ ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp,
+ hcon->dst_type, conn->dst, 0, conn->src,
+ res);
+ if (ret) {
+ reason = SMP_UNSPECIFIED;
+ goto error;
+ }
+
+ swap128(res, confirm);
+
+ if (memcmp(smp->pcnf, confirm, sizeof(smp->pcnf)) != 0) {
+ BT_ERR("Pairing failed (confirmation values mismatch)");
+ reason = SMP_CONFIRM_FAILED;
+ goto error;
+ }
+
+ if (hcon->out) {
+ u8 stk[16], rand[8];
+ __le16 ediv;
+
+ memset(rand, 0, sizeof(rand));
+ ediv = 0;
+
+ smp_s1(tfm, smp->tk, smp->rrnd, smp->prnd, key);
+ swap128(key, stk);
+
+ memset(stk + smp->smp_key_size, 0,
+ SMP_MAX_ENC_KEY_SIZE - smp->smp_key_size);
+
+ if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend)) {
+ reason = SMP_UNSPECIFIED;
+ goto error;
+ }
+
+ hci_le_start_enc(hcon, ediv, rand, stk);
+ hcon->enc_key_size = smp->smp_key_size;
+ } else {
+ u8 stk[16], r[16], rand[8];
+ __le16 ediv;
+
+ memset(rand, 0, sizeof(rand));
+ ediv = 0;
+
+ swap128(smp->prnd, r);
+ smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(r), r);
+
+ smp_s1(tfm, smp->tk, smp->prnd, smp->rrnd, key);
+ swap128(key, stk);
+
+ memset(stk + smp->smp_key_size, 0,
+ SMP_MAX_ENC_KEY_SIZE - smp->smp_key_size);
+
+ hci_add_ltk(hcon->hdev, 0, conn->dst, smp->smp_key_size,
+ ediv, rand, stk);
+ }
+
+ return;
+
+error:
+ smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason), &reason);
+ smp_chan_destroy(conn);
+}
+
+static struct smp_chan *smp_chan_create(struct l2cap_conn *conn)
+{
+ struct smp_chan *smp;
+
+ smp = kzalloc(sizeof(struct smp_chan), GFP_ATOMIC);
+ if (!smp)
+ return NULL;
+
+ INIT_WORK(&smp->confirm, confirm_work);
+ INIT_WORK(&smp->random, random_work);
+
+ smp->conn = conn;
+ conn->smp_chan = smp;
+
+ hci_conn_hold(conn->hcon);
+
+ return smp;
+}
+
+void smp_chan_destroy(struct l2cap_conn *conn)
+{
+ kfree(conn->smp_chan);
+ hci_conn_put(conn->hcon);
+}
+
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;
+ int ret;
BT_DBG("conn %p", conn);
- conn->preq[0] = SMP_CMD_PAIRING_REQ;
- memcpy(&conn->preq[1], req, sizeof(*req));
+ if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend))
+ smp = smp_chan_create(conn);
+
+ smp = conn->smp_chan;
+
+ smp->preq[0] = SMP_CMD_PAIRING_REQ;
+ memcpy(&smp->preq[1], req, sizeof(*req));
skb_pull(skb, sizeof(*req));
if (req->oob_flag)
@@ -260,32 +411,33 @@ static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
return SMP_ENC_KEY_SIZE;
/* Just works */
- memset(conn->tk, 0, sizeof(conn->tk));
+ memset(smp->tk, 0, sizeof(smp->tk));
+
+ ret = smp_rand(smp->prnd);
+ if (ret)
+ return SMP_UNSPECIFIED;
- conn->prsp[0] = SMP_CMD_PAIRING_RSP;
- memcpy(&conn->prsp[1], &rsp, sizeof(rsp));
+ smp->prsp[0] = SMP_CMD_PAIRING_RSP;
+ memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
- mod_timer(&conn->security_timer, jiffies +
- msecs_to_jiffies(SMP_TIMEOUT));
-
return 0;
}
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_cmd_pairing_confirm cp;
- struct crypto_blkcipher *tfm = conn->hcon->hdev->tfm;
+ struct smp_chan *smp = conn->smp_chan;
+ struct hci_dev *hdev = conn->hcon->hdev;
+ u8 key_size;
int ret;
- u8 res[16], key_size;
BT_DBG("conn %p", conn);
skb_pull(skb, sizeof(*rsp));
- req = (void *) &conn->preq[1];
+ req = (void *) &smp->preq[1];
key_size = min(req->max_key_size, rsp->max_key_size);
if (check_enc_key_size(conn, key_size))
@@ -295,222 +447,154 @@ static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
return SMP_OOB_NOT_AVAIL;
/* Just works */
- memset(conn->tk, 0, sizeof(conn->tk));
-
- conn->prsp[0] = SMP_CMD_PAIRING_RSP;
- memcpy(&conn->prsp[1], rsp, sizeof(*rsp));
-
- ret = smp_rand(conn->prnd);
- if (ret)
- return SMP_UNSPECIFIED;
+ memset(smp->tk, 0, sizeof(smp->tk));
- ret = smp_c1(tfm, conn->tk, conn->prnd, conn->preq, conn->prsp, 0,
- conn->src, conn->hcon->dst_type, conn->dst, res);
+ ret = smp_rand(smp->prnd);
if (ret)
return SMP_UNSPECIFIED;
- swap128(res, cp.confirm_val);
+ smp->prsp[0] = SMP_CMD_PAIRING_RSP;
+ memcpy(&smp->prsp[1], rsp, sizeof(*rsp));
- smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
+ queue_work(hdev->workqueue, &smp->confirm);
return 0;
}
static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
{
- struct crypto_blkcipher *tfm = conn->hcon->hdev->tfm;
+ 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");
- memcpy(conn->pcnf, skb->data, sizeof(conn->pcnf));
- skb_pull(skb, sizeof(conn->pcnf));
+ memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf));
+ skb_pull(skb, sizeof(smp->pcnf));
if (conn->hcon->out) {
u8 random[16];
- swap128(conn->prnd, random);
+ swap128(smp->prnd, random);
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(random),
random);
} else {
- struct smp_cmd_pairing_confirm cp;
- int ret;
- u8 res[16];
-
- ret = smp_rand(conn->prnd);
- if (ret)
- return SMP_UNSPECIFIED;
-
- ret = smp_c1(tfm, conn->tk, conn->prnd, conn->preq, conn->prsp,
- conn->hcon->dst_type, conn->dst,
- 0, conn->src, res);
- if (ret)
- return SMP_CONFIRM_FAILED;
-
- swap128(res, cp.confirm_val);
-
- smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
+ queue_work(hdev->workqueue, &smp->confirm);
}
- mod_timer(&conn->security_timer, jiffies +
- msecs_to_jiffies(SMP_TIMEOUT));
-
return 0;
}
static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
{
- struct hci_conn *hcon = conn->hcon;
- struct crypto_blkcipher *tfm = hcon->hdev->tfm;
- int ret;
- u8 key[16], res[16], random[16], confirm[16];
+ struct smp_chan *smp = conn->smp_chan;
+ struct hci_dev *hdev = conn->hcon->hdev;
- swap128(skb->data, random);
- skb_pull(skb, sizeof(random));
-
- if (conn->hcon->out)
- ret = smp_c1(tfm, conn->tk, random, conn->preq, conn->prsp, 0,
- conn->src, conn->hcon->dst_type, conn->dst,
- res);
- else
- ret = smp_c1(tfm, conn->tk, random, conn->preq, conn->prsp,
- conn->hcon->dst_type, conn->dst, 0, conn->src,
- res);
- if (ret)
- return SMP_UNSPECIFIED;
-
- BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
-
- swap128(res, confirm);
-
- if (memcmp(conn->pcnf, confirm, sizeof(conn->pcnf)) != 0) {
- BT_ERR("Pairing failed (confirmation values mismatch)");
- return SMP_CONFIRM_FAILED;
- }
-
- if (conn->hcon->out) {
- u8 stk[16], rand[8];
- __le16 ediv;
-
- memset(rand, 0, sizeof(rand));
- ediv = 0;
+ BT_DBG("conn %p", conn);
- smp_s1(tfm, conn->tk, random, conn->prnd, key);
- swap128(key, stk);
+ swap128(skb->data, smp->rrnd);
+ skb_pull(skb, sizeof(smp->rrnd));
- memset(stk + conn->smp_key_size, 0,
- SMP_MAX_ENC_KEY_SIZE - conn->smp_key_size);
+ queue_work(hdev->workqueue, &smp->random);
- hci_le_start_enc(hcon, ediv, rand, stk);
- hcon->enc_key_size = conn->smp_key_size;
- } else {
- u8 stk[16], r[16], rand[8];
- __le16 ediv;
+ return 0;
+}
- memset(rand, 0, sizeof(rand));
- ediv = 0;
+static u8 smp_ltk_encrypt(struct l2cap_conn *conn)
+{
+ struct link_key *key;
+ struct key_master_id *master;
+ struct hci_conn *hcon = conn->hcon;
- swap128(conn->prnd, r);
- smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(r), r);
+ key = hci_find_link_key_type(hcon->hdev, conn->dst,
+ HCI_LK_SMP_LTK);
+ if (!key)
+ return 0;
- smp_s1(tfm, conn->tk, conn->prnd, random, key);
- swap128(key, stk);
+ if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND,
+ &hcon->pend))
+ return 1;
- memset(stk + conn->smp_key_size, 0,
- SMP_MAX_ENC_KEY_SIZE - conn->smp_key_size);
+ master = (void *) key->data;
+ hci_le_start_enc(hcon, master->ediv, master->rand,
+ key->val);
+ hcon->enc_key_size = key->pin_len;
- hci_add_ltk(conn->hcon->hdev, 0, conn->dst, conn->smp_key_size,
- ediv, rand, stk);
- }
+ return 1;
- return 0;
}
-
static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_security_req *rp = (void *) skb->data;
struct smp_cmd_pairing cp;
struct hci_conn *hcon = conn->hcon;
+ struct smp_chan *smp;
BT_DBG("conn %p", conn);
- if (test_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend))
+ hcon->pending_sec_level = BT_SECURITY_MEDIUM;
+
+ if (smp_ltk_encrypt(conn))
return 0;
+ if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend))
+ return 0;
+
+ smp = smp_chan_create(conn);
+
skb_pull(skb, sizeof(*rp));
memset(&cp, 0, sizeof(cp));
build_pairing_cmd(conn, &cp, NULL, rp->auth_req);
- conn->preq[0] = SMP_CMD_PAIRING_REQ;
- memcpy(&conn->preq[1], &cp, sizeof(cp));
+ smp->preq[0] = SMP_CMD_PAIRING_REQ;
+ memcpy(&smp->preq[1], &cp, sizeof(cp));
smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
- mod_timer(&conn->security_timer, jiffies +
- msecs_to_jiffies(SMP_TIMEOUT));
-
- set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend);
-
return 0;
}
int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level)
{
struct hci_conn *hcon = conn->hcon;
- __u8 authreq;
+ struct smp_chan *smp = conn->smp_chan;
BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level);
if (!lmp_host_le_capable(hcon->hdev))
return 1;
- if (IS_ERR(hcon->hdev->tfm))
- return 1;
-
- if (test_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend))
- return 0;
-
if (sec_level == BT_SECURITY_LOW)
return 1;
if (hcon->sec_level >= sec_level)
return 1;
- authreq = seclevel_to_authreq(sec_level);
-
- if (hcon->link_mode & HCI_LM_MASTER) {
- struct smp_cmd_pairing cp;
- struct link_key *key;
+ if (hcon->link_mode & HCI_LM_MASTER)
+ if (smp_ltk_encrypt(conn))
+ goto done;
- key = hci_find_link_key_type(hcon->hdev, conn->dst,
- HCI_LK_SMP_LTK);
- if (key) {
- struct key_master_id *master = (void *) key->data;
+ if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->pend))
+ return 0;
- hci_le_start_enc(hcon, master->ediv, master->rand,
- key->val);
- hcon->enc_key_size = key->pin_len;
+ smp = smp_chan_create(conn);
- goto done;
- }
-
- build_pairing_cmd(conn, &cp, NULL, authreq);
- conn->preq[0] = SMP_CMD_PAIRING_REQ;
- memcpy(&conn->preq[1], &cp, sizeof(cp));
+ if (hcon->link_mode & HCI_LM_MASTER) {
+ struct smp_cmd_pairing cp;
- mod_timer(&conn->security_timer, jiffies +
- msecs_to_jiffies(SMP_TIMEOUT));
+ build_pairing_cmd(conn, &cp, NULL, SMP_AUTH_NONE);
+ smp->preq[0] = SMP_CMD_PAIRING_REQ;
+ memcpy(&smp->preq[1], &cp, sizeof(cp));
smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
} else {
struct smp_cmd_security_req cp;
- cp.auth_req = authreq;
+ cp.auth_req = SMP_AUTH_NONE;
smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp);
}
done:
hcon->pending_sec_level = sec_level;
- set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->pend);
return 0;
}
@@ -518,10 +602,11 @@ done:
static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_encrypt_info *rp = (void *) skb->data;
+ struct smp_chan *smp = conn->smp_chan;
skb_pull(skb, sizeof(*rp));
- memcpy(conn->tk, rp->ltk, sizeof(conn->tk));
+ memcpy(smp->tk, rp->ltk, sizeof(smp->tk));
return 0;
}
@@ -529,11 +614,12 @@ static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb)
static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb)
{
struct smp_cmd_master_ident *rp = (void *) skb->data;
+ struct smp_chan *smp = conn->smp_chan;
skb_pull(skb, sizeof(*rp));
- hci_add_ltk(conn->hcon->hdev, 1, conn->src, conn->smp_key_size,
- rp->ediv, rp->rand, conn->tk);
+ hci_add_ltk(conn->hcon->hdev, 1, conn->src, smp->smp_key_size,
+ rp->ediv, rp->rand, smp->tk);
smp_distribute_keys(conn, 1);
@@ -552,12 +638,6 @@ int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
goto done;
}
- if (IS_ERR(conn->hcon->hdev->tfm)) {
- err = PTR_ERR(conn->hcon->hdev->tfm);
- reason = SMP_PAIRING_NOTSUPP;
- goto done;
- }
-
skb_pull(skb, sizeof(code));
switch (code) {
@@ -621,20 +701,21 @@ done:
int smp_distribute_keys(struct l2cap_conn *conn, __u8 force)
{
struct smp_cmd_pairing *req, *rsp;
+ struct smp_chan *smp = conn->smp_chan;
__u8 *keydist;
BT_DBG("conn %p force %d", conn, force);
- if (IS_ERR(conn->hcon->hdev->tfm))
- return PTR_ERR(conn->hcon->hdev->tfm);
+ if (!test_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend))
+ return 0;
- rsp = (void *) &conn->prsp[1];
+ rsp = (void *) &smp->prsp[1];
/* The responder sends its keys first */
if (!force && conn->hcon->out && (rsp->resp_key_dist & 0x07))
return 0;
- req = (void *) &conn->preq[1];
+ req = (void *) &smp->preq[1];
if (conn->hcon->out) {
keydist = &rsp->init_key_dist;
@@ -658,7 +739,7 @@ int smp_distribute_keys(struct l2cap_conn *conn, __u8 force)
smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc);
- hci_add_ltk(conn->hcon->hdev, 1, conn->dst, conn->smp_key_size,
+ hci_add_ltk(conn->hcon->hdev, 1, conn->dst, smp->smp_key_size,
ediv, ident.rand, enc.ltk);
ident.ediv = cpu_to_le16(ediv);
@@ -698,5 +779,11 @@ int smp_distribute_keys(struct l2cap_conn *conn, __u8 force)
*keydist &= ~SMP_DIST_SIGN;
}
+ if (conn->hcon->out || force) {
+ clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->pend);
+ del_timer(&conn->security_timer);
+ smp_chan_destroy(conn);
+ }
+
return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 08:50:26 +0000