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Bluetooth: Use the updated key structures for handling LTKs

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This updates all the users of the older way, that was using the
link_keys list to store the SMP keys, to use the new way.

This includes defining new types for the keys, we have a type for each
combination of STK/LTK and Master/Slave.

Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org>
Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Vinicius Costa Gomes 2012-02-02 21:08:01 -03:00 committed by Johan Hedberg
parent b899efaf9b
commit c9839a11c0
4 changed files with 71 additions and 65 deletions
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11
include/net/bluetooth/hci_core.h
View file

@ -658,12 +658,13 @@ int hci_link_keys_clear(struct hci_dev *hdev);
struct link_key *hci_find_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr); struct link_key *hci_find_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr);
int hci_add_link_key(struct hci_dev *hdev, struct hci_conn *conn, int new_key, int hci_add_link_key(struct hci_dev *hdev, struct hci_conn *conn, int new_key,
bdaddr_t *bdaddr, u8 *val, u8 type, u8 pin_len); bdaddr_t *bdaddr, u8 *val, u8 type, u8 pin_len);
struct link_key *hci_find_ltk(struct hci_dev *hdev, __le16 ediv, u8 rand[8]); struct smp_ltk *hci_find_ltk(struct hci_dev *hdev, __le16 ediv, u8 rand[8]);
struct link_key *hci_find_link_key_type(struct hci_dev *hdev, int hci_add_ltk(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 addr_type, u8 type,
bdaddr_t *bdaddr, u8 type); int new_key, u8 authenticated, u8 tk[16],
u8 enc_size, u16 ediv, u8 rand[8]);
struct smp_ltk *hci_find_ltk_by_addr(struct hci_dev *hdev, bdaddr_t *bdaddr,
u8 addr_type);
int hci_remove_ltk(struct hci_dev *hdev, bdaddr_t *bdaddr); int hci_remove_ltk(struct hci_dev *hdev, bdaddr_t *bdaddr);
int hci_add_ltk(struct hci_dev *hdev, int new_key, bdaddr_t *bdaddr,
u8 key_size, __le16 ediv, u8 rand[8], u8 ltk[16]);
int hci_smp_ltks_clear(struct hci_dev *hdev); int hci_smp_ltks_clear(struct hci_dev *hdev);
int hci_remove_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr); int hci_remove_link_key(struct hci_dev *hdev, bdaddr_t *bdaddr);

76
net/bluetooth/hci_core.c
View file

@ -1222,41 +1222,35 @@ static int hci_persistent_key(struct hci_dev *hdev, struct hci_conn *conn,
return 0; return 0;
} }
struct link_key *hci_find_ltk(struct hci_dev *hdev, __le16 ediv, u8 rand[8]) struct smp_ltk *hci_find_ltk(struct hci_dev *hdev, __le16 ediv, u8 rand[8])
{ {
struct link_key *k; struct smp_ltk *k;
list_for_each_entry(k, &hdev->link_keys, list) { list_for_each_entry(k, &hdev->long_term_keys, list) {
struct key_master_id *id; if (k->ediv != ediv ||
memcmp(rand, k->rand, sizeof(k->rand)))
if (k->type != HCI_LK_SMP_LTK)
continue; continue;
if (k->dlen != sizeof(*id)) return k;
continue;
id = (void *) &k->data;
if (id->ediv == ediv &&
(memcmp(rand, id->rand, sizeof(id->rand)) == 0))
return k;
} }
return NULL; return NULL;
} }
EXPORT_SYMBOL(hci_find_ltk); EXPORT_SYMBOL(hci_find_ltk);
struct link_key *hci_find_link_key_type(struct hci_dev *hdev, struct smp_ltk *hci_find_ltk_by_addr(struct hci_dev *hdev, bdaddr_t *bdaddr,
bdaddr_t *bdaddr, u8 type) u8 addr_type)
{ {
struct link_key *k; struct smp_ltk *k;
list_for_each_entry(k, &hdev->link_keys, list) list_for_each_entry(k, &hdev->long_term_keys, list)
if (k->type == type && bacmp(bdaddr, &k->bdaddr) == 0) if (addr_type == k->bdaddr_type &&
bacmp(bdaddr, &k->bdaddr) == 0)
return k; return k;
return NULL; return NULL;
} }
EXPORT_SYMBOL(hci_find_link_key_type); EXPORT_SYMBOL(hci_find_ltk_by_addr);
int hci_add_link_key(struct hci_dev *hdev, struct hci_conn *conn, int new_key, int hci_add_link_key(struct hci_dev *hdev, struct hci_conn *conn, int new_key,
bdaddr_t *bdaddr, u8 *val, u8 type, u8 pin_len) bdaddr_t *bdaddr, u8 *val, u8 type, u8 pin_len)
@ -1313,40 +1307,36 @@ int hci_add_link_key(struct hci_dev *hdev, struct hci_conn *conn, int new_key,
return 0; return 0;
} }
int hci_add_ltk(struct hci_dev *hdev, int new_key, bdaddr_t *bdaddr, int hci_add_ltk(struct hci_dev *hdev, bdaddr_t *bdaddr, u8 addr_type, u8 type,
u8 key_size, __le16 ediv, u8 rand[8], u8 ltk[16]) int new_key, u8 authenticated, u8 tk[16],
u8 enc_size, u16 ediv, u8 rand[8])
{ {
struct link_key *key, *old_key; struct smp_ltk *key, *old_key;
struct key_master_id *id;
u8 old_key_type;
BT_DBG("%s addr %s", hdev->name, batostr(bdaddr)); if (!(type & HCI_SMP_STK) && !(type & HCI_SMP_LTK))
return 0;
old_key = hci_find_link_key_type(hdev, bdaddr, HCI_LK_SMP_LTK); old_key = hci_find_ltk_by_addr(hdev, bdaddr, addr_type);
if (old_key) { if (old_key)
key = old_key; key = old_key;
old_key_type = old_key->type; else {
} else { key = kzalloc(sizeof(*key), GFP_ATOMIC);
key = kzalloc(sizeof(*key) + sizeof(*id), GFP_ATOMIC);
if (!key) if (!key)
return -ENOMEM; return -ENOMEM;
list_add(&key->list, &hdev->link_keys); list_add(&key->list, &hdev->long_term_keys);
old_key_type = 0xff;
} }
key->dlen = sizeof(*id);
bacpy(&key->bdaddr, bdaddr); bacpy(&key->bdaddr, bdaddr);
memcpy(key->val, ltk, sizeof(key->val)); key->bdaddr_type = addr_type;
key->type = HCI_LK_SMP_LTK; memcpy(key->val, tk, sizeof(key->val));
key->pin_len = key_size; key->authenticated = authenticated;
key->ediv = ediv;
key->enc_size = enc_size;
key->type = type;
memcpy(key->rand, rand, sizeof(key->rand));
id = (void *) &key->data; if (!new_key)
id->ediv = ediv; return 0;
memcpy(id->rand, rand, sizeof(id->rand));
if (new_key)
mgmt_new_link_key(hdev, key, old_key_type);
return 0; return 0;
} }

11
net/bluetooth/hci_event.c
View file

@ -3256,7 +3256,7 @@ static inline void hci_le_ltk_request_evt(struct hci_dev *hdev,
struct hci_cp_le_ltk_reply cp; struct hci_cp_le_ltk_reply cp;
struct hci_cp_le_ltk_neg_reply neg; struct hci_cp_le_ltk_neg_reply neg;
struct hci_conn *conn; struct hci_conn *conn;
struct link_key *ltk; struct smp_ltk *ltk;
BT_DBG("%s handle %d", hdev->name, cpu_to_le16(ev->handle)); BT_DBG("%s handle %d", hdev->name, cpu_to_le16(ev->handle));
@ -3272,10 +3272,17 @@ static inline void hci_le_ltk_request_evt(struct hci_dev *hdev,
memcpy(cp.ltk, ltk->val, sizeof(ltk->val)); memcpy(cp.ltk, ltk->val, sizeof(ltk->val));
cp.handle = cpu_to_le16(conn->handle); cp.handle = cpu_to_le16(conn->handle);
conn->pin_length = ltk->pin_len;
if (ltk->authenticated)
conn->sec_level = BT_SECURITY_HIGH;
hci_send_cmd(hdev, HCI_OP_LE_LTK_REPLY, sizeof(cp), &cp); hci_send_cmd(hdev, HCI_OP_LE_LTK_REPLY, sizeof(cp), &cp);
if (ltk->type & HCI_SMP_STK) {
list_del(&ltk->list);
kfree(ltk);
}
hci_dev_unlock(hdev); hci_dev_unlock(hdev);
return; return;

38
net/bluetooth/smp.c
View file

@ -475,8 +475,9 @@ static void random_work(struct work_struct *work)
memset(stk + smp->enc_key_size, 0, memset(stk + smp->enc_key_size, 0,
SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size); SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size);
hci_add_ltk(hcon->hdev, 0, conn->dst, smp->enc_key_size, hci_add_ltk(hcon->hdev, conn->dst, hcon->dst_type,
ediv, rand, stk); HCI_SMP_STK_SLAVE, 0, 0, stk,
smp->enc_key_size, ediv, rand);
} }
return; return;
@ -701,22 +702,18 @@ static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
static u8 smp_ltk_encrypt(struct l2cap_conn *conn) static u8 smp_ltk_encrypt(struct l2cap_conn *conn)
{ {
struct link_key *key; struct smp_ltk *key;
struct key_master_id *master;
struct hci_conn *hcon = conn->hcon; struct hci_conn *hcon = conn->hcon;
key = hci_find_link_key_type(hcon->hdev, conn->dst, key = hci_find_ltk_by_addr(hcon->hdev, conn->dst, hcon->dst_type);
HCI_LK_SMP_LTK);
if (!key) if (!key)
return 0; return 0;
if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
return 1; return 1;
master = (void *) key->data; hci_le_start_enc(hcon, key->ediv, key->rand, key->val);
hci_le_start_enc(hcon, master->ediv, master->rand, hcon->enc_key_size = key->enc_size;
key->val);
hcon->enc_key_size = key->pin_len;
return 1; return 1;
@ -819,13 +816,19 @@ 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_cmd_master_ident *rp = (void *) skb->data;
struct smp_chan *smp = conn->smp_chan; struct smp_chan *smp = conn->smp_chan;
struct hci_dev *hdev = conn->hcon->hdev;
struct hci_conn *hcon = conn->hcon;
u8 authenticated;
skb_pull(skb, sizeof(*rp)); skb_pull(skb, sizeof(*rp));
hci_add_ltk(conn->hcon->hdev, 1, conn->dst, smp->enc_key_size, hci_dev_lock(hdev);
rp->ediv, rp->rand, smp->tk); authenticated = (conn->hcon->sec_level == BT_SECURITY_HIGH);
hci_add_ltk(conn->hcon->hdev, conn->dst, hcon->dst_type,
HCI_SMP_LTK, 1, authenticated, smp->tk,
smp->enc_key_size, rp->ediv, rp->rand);
smp_distribute_keys(conn, 1); smp_distribute_keys(conn, 1);
hci_dev_unlock(hdev);
return 0; return 0;
} }
@ -935,6 +938,8 @@ int smp_distribute_keys(struct l2cap_conn *conn, __u8 force)
if (*keydist & SMP_DIST_ENC_KEY) { if (*keydist & SMP_DIST_ENC_KEY) {
struct smp_cmd_encrypt_info enc; struct smp_cmd_encrypt_info enc;
struct smp_cmd_master_ident ident; struct smp_cmd_master_ident ident;
struct hci_conn *hcon = conn->hcon;
u8 authenticated;
__le16 ediv; __le16 ediv;
get_random_bytes(enc.ltk, sizeof(enc.ltk)); get_random_bytes(enc.ltk, sizeof(enc.ltk));
@ -943,8 +948,11 @@ int smp_distribute_keys(struct l2cap_conn *conn, __u8 force)
smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc); smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc);
hci_add_ltk(conn->hcon->hdev, 1, conn->dst, smp->enc_key_size, authenticated = hcon->sec_level == BT_SECURITY_HIGH;
ediv, ident.rand, enc.ltk); hci_add_ltk(conn->hcon->hdev, conn->dst, hcon->dst_type,
HCI_SMP_LTK_SLAVE, 1, authenticated,
enc.ltk, smp->enc_key_size,
ediv, ident.rand);
ident.ediv = cpu_to_le16(ediv); ident.ediv = cpu_to_le16(ediv);