2011-06-09 21:50:40 +00:00
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/*
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BlueZ - Bluetooth protocol stack for Linux
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Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License version 2 as
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published by the Free Software Foundation;
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
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IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
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CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS,
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COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS
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SOFTWARE IS DISCLAIMED.
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*/
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2012-05-23 07:04:22 +00:00
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#include <linux/crypto.h>
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#include <linux/scatterlist.h>
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#include <crypto/b128ops.h>
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2011-06-09 21:50:40 +00:00
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#include <net/bluetooth/bluetooth.h>
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#include <net/bluetooth/hci_core.h>
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#include <net/bluetooth/l2cap.h>
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2011-12-22 00:12:12 +00:00
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#include <net/bluetooth/mgmt.h>
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2011-06-09 21:50:40 +00:00
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#include <net/bluetooth/smp.h>
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2011-06-09 21:50:44 +00:00
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2012-03-01 22:32:37 +00:00
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#define SMP_TIMEOUT msecs_to_jiffies(30000)
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2011-06-14 16:37:41 +00:00
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2012-10-11 14:26:06 +00:00
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#define AUTH_REQ_MASK 0x07
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2011-06-09 21:50:44 +00:00
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static inline void swap128(u8 src[16], u8 dst[16])
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{
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int i;
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for (i = 0; i < 16; i++)
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dst[15 - i] = src[i];
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}
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static inline void swap56(u8 src[7], u8 dst[7])
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{
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int i;
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for (i = 0; i < 7; i++)
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dst[6 - i] = src[i];
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}
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static int smp_e(struct crypto_blkcipher *tfm, const u8 *k, u8 *r)
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{
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struct blkcipher_desc desc;
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struct scatterlist sg;
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int err, iv_len;
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unsigned char iv[128];
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if (tfm == NULL) {
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BT_ERR("tfm %p", tfm);
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return -EINVAL;
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}
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desc.tfm = tfm;
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desc.flags = 0;
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err = crypto_blkcipher_setkey(tfm, k, 16);
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if (err) {
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BT_ERR("cipher setkey failed: %d", err);
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return err;
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}
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sg_init_one(&sg, r, 16);
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iv_len = crypto_blkcipher_ivsize(tfm);
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if (iv_len) {
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memset(&iv, 0xff, iv_len);
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crypto_blkcipher_set_iv(tfm, iv, iv_len);
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}
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err = crypto_blkcipher_encrypt(&desc, &sg, &sg, 16);
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if (err)
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BT_ERR("Encrypt data error %d", err);
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return err;
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}
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static int smp_c1(struct crypto_blkcipher *tfm, u8 k[16], u8 r[16],
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u8 preq[7], u8 pres[7], u8 _iat, bdaddr_t *ia,
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u8 _rat, bdaddr_t *ra, u8 res[16])
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{
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u8 p1[16], p2[16];
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int err;
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memset(p1, 0, 16);
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/* p1 = pres || preq || _rat || _iat */
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swap56(pres, p1);
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swap56(preq, p1 + 7);
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p1[14] = _rat;
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p1[15] = _iat;
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memset(p2, 0, 16);
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/* p2 = padding || ia || ra */
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baswap((bdaddr_t *) (p2 + 4), ia);
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baswap((bdaddr_t *) (p2 + 10), ra);
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/* res = r XOR p1 */
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u128_xor((u128 *) res, (u128 *) r, (u128 *) p1);
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/* res = e(k, res) */
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err = smp_e(tfm, k, res);
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if (err) {
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BT_ERR("Encrypt data error");
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return err;
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}
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/* res = res XOR p2 */
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u128_xor((u128 *) res, (u128 *) res, (u128 *) p2);
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/* res = e(k, res) */
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err = smp_e(tfm, k, res);
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if (err)
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BT_ERR("Encrypt data error");
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return err;
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}
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static int smp_s1(struct crypto_blkcipher *tfm, u8 k[16],
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u8 r1[16], u8 r2[16], u8 _r[16])
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{
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int err;
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/* Just least significant octets from r1 and r2 are considered */
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memcpy(_r, r1 + 8, 8);
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memcpy(_r + 8, r2 + 8, 8);
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err = smp_e(tfm, k, _r);
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if (err)
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BT_ERR("Encrypt data error");
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return err;
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}
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static int smp_rand(u8 *buf)
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{
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get_random_bytes(buf, 16);
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return 0;
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}
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2011-06-09 21:50:40 +00:00
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static struct sk_buff *smp_build_cmd(struct l2cap_conn *conn, u8 code,
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u16 dlen, void *data)
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{
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struct sk_buff *skb;
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struct l2cap_hdr *lh;
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int len;
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len = L2CAP_HDR_SIZE + sizeof(code) + dlen;
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if (len > conn->mtu)
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return NULL;
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skb = bt_skb_alloc(len, GFP_ATOMIC);
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if (!skb)
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return NULL;
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lh = (struct l2cap_hdr *) skb_put(skb, L2CAP_HDR_SIZE);
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lh->len = cpu_to_le16(sizeof(code) + dlen);
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2012-10-10 16:39:28 +00:00
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lh->cid = __constant_cpu_to_le16(L2CAP_CID_SMP);
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2011-06-09 21:50:40 +00:00
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memcpy(skb_put(skb, sizeof(code)), &code, sizeof(code));
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memcpy(skb_put(skb, dlen), data, dlen);
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return skb;
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}
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static void smp_send_cmd(struct l2cap_conn *conn, u8 code, u16 len, void *data)
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{
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struct sk_buff *skb = smp_build_cmd(conn, code, len, data);
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BT_DBG("code 0x%2.2x", code);
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if (!skb)
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return;
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2011-11-02 13:52:01 +00:00
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skb->priority = HCI_PRIO_MAX;
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hci_send_acl(conn->hchan, skb, 0);
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2011-08-20 00:06:50 +00:00
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2011-12-20 12:57:27 +00:00
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cancel_delayed_work_sync(&conn->security_timer);
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2012-03-01 22:32:37 +00:00
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schedule_delayed_work(&conn->security_timer, SMP_TIMEOUT);
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2011-06-09 21:50:40 +00:00
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}
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2011-12-22 00:12:12 +00:00
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static __u8 authreq_to_seclevel(__u8 authreq)
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{
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if (authreq & SMP_AUTH_MITM)
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return BT_SECURITY_HIGH;
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else
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return BT_SECURITY_MEDIUM;
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}
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static __u8 seclevel_to_authreq(__u8 sec_level)
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{
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switch (sec_level) {
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case BT_SECURITY_HIGH:
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return SMP_AUTH_MITM | SMP_AUTH_BONDING;
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case BT_SECURITY_MEDIUM:
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return SMP_AUTH_BONDING;
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default:
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return SMP_AUTH_NONE;
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}
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}
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2011-06-09 21:50:52 +00:00
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static void build_pairing_cmd(struct l2cap_conn *conn,
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2011-07-07 21:59:38 +00:00
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struct smp_cmd_pairing *req,
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struct smp_cmd_pairing *rsp,
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__u8 authreq)
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2011-06-09 21:50:52 +00:00
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{
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2011-12-22 00:12:12 +00:00
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u8 dist_keys = 0;
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2011-07-07 21:59:38 +00:00
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2012-01-08 21:11:15 +00:00
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if (test_bit(HCI_PAIRABLE, &conn->hcon->hdev->dev_flags)) {
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2011-08-25 23:02:37 +00:00
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dist_keys = SMP_DIST_ENC_KEY;
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2011-07-07 21:59:38 +00:00
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authreq |= SMP_AUTH_BONDING;
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2011-12-22 00:12:12 +00:00
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} else {
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authreq &= ~SMP_AUTH_BONDING;
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2011-07-07 21:59:38 +00:00
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}
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if (rsp == NULL) {
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req->io_capability = conn->hcon->io_capability;
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req->oob_flag = SMP_OOB_NOT_PRESENT;
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req->max_key_size = SMP_MAX_ENC_KEY_SIZE;
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2011-12-22 00:12:12 +00:00
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req->init_key_dist = 0;
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2011-07-07 21:59:38 +00:00
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req->resp_key_dist = dist_keys;
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2012-10-11 14:26:06 +00:00
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req->auth_req = (authreq & AUTH_REQ_MASK);
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2011-07-07 21:59:38 +00:00
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return;
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}
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rsp->io_capability = conn->hcon->io_capability;
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rsp->oob_flag = SMP_OOB_NOT_PRESENT;
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rsp->max_key_size = SMP_MAX_ENC_KEY_SIZE;
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2011-12-22 00:12:12 +00:00
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rsp->init_key_dist = 0;
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2011-07-07 21:59:38 +00:00
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rsp->resp_key_dist = req->resp_key_dist & dist_keys;
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2012-10-11 14:26:06 +00:00
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rsp->auth_req = (authreq & AUTH_REQ_MASK);
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2011-06-09 21:50:52 +00:00
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}
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2011-06-14 16:37:42 +00:00
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static u8 check_enc_key_size(struct l2cap_conn *conn, __u8 max_key_size)
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{
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2011-09-05 17:31:30 +00:00
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struct smp_chan *smp = conn->smp_chan;
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2011-06-14 16:37:42 +00:00
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if ((max_key_size > SMP_MAX_ENC_KEY_SIZE) ||
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(max_key_size < SMP_MIN_ENC_KEY_SIZE))
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return SMP_ENC_KEY_SIZE;
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2012-01-30 22:29:12 +00:00
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smp->enc_key_size = max_key_size;
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2011-06-14 16:37:42 +00:00
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return 0;
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}
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2011-11-23 16:28:36 +00:00
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static void smp_failure(struct l2cap_conn *conn, u8 reason, u8 send)
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{
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2012-02-09 14:07:29 +00:00
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struct hci_conn *hcon = conn->hcon;
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2011-11-23 16:28:36 +00:00
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if (send)
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smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason),
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&reason);
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2012-01-16 04:10:31 +00:00
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clear_bit(HCI_CONN_ENCRYPT_PEND, &conn->hcon->flags);
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2012-02-09 14:07:29 +00:00
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mgmt_auth_failed(conn->hcon->hdev, conn->dst, hcon->type,
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2012-10-25 19:55:51 +00:00
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hcon->dst_type, HCI_ERROR_AUTH_FAILURE);
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2012-02-01 21:27:56 +00:00
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2012-08-01 23:34:15 +00:00
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cancel_delayed_work_sync(&conn->security_timer);
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if (test_and_clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags))
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2012-02-01 21:27:56 +00:00
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smp_chan_destroy(conn);
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2011-11-23 16:28:36 +00:00
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}
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2011-12-22 00:12:12 +00:00
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#define JUST_WORKS 0x00
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#define JUST_CFM 0x01
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#define REQ_PASSKEY 0x02
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#define CFM_PASSKEY 0x03
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#define REQ_OOB 0x04
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#define OVERLAP 0xFF
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static const u8 gen_method[5][5] = {
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{ JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
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{ JUST_WORKS, JUST_CFM, REQ_PASSKEY, JUST_WORKS, REQ_PASSKEY },
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{ CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, CFM_PASSKEY },
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{ JUST_WORKS, JUST_CFM, JUST_WORKS, JUST_WORKS, JUST_CFM },
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{ CFM_PASSKEY, CFM_PASSKEY, REQ_PASSKEY, JUST_WORKS, OVERLAP },
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};
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static int tk_request(struct l2cap_conn *conn, u8 remote_oob, u8 auth,
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u8 local_io, u8 remote_io)
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{
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struct hci_conn *hcon = conn->hcon;
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struct smp_chan *smp = conn->smp_chan;
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u8 method;
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u32 passkey = 0;
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int ret = 0;
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/* Initialize key for JUST WORKS */
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memset(smp->tk, 0, sizeof(smp->tk));
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clear_bit(SMP_FLAG_TK_VALID, &smp->smp_flags);
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BT_DBG("tk_request: auth:%d lcl:%d rem:%d", auth, local_io, remote_io);
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/* If neither side wants MITM, use JUST WORKS */
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/* If either side has unknown io_caps, use JUST WORKS */
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/* Otherwise, look up method from the table */
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if (!(auth & SMP_AUTH_MITM) ||
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local_io > SMP_IO_KEYBOARD_DISPLAY ||
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remote_io > SMP_IO_KEYBOARD_DISPLAY)
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method = JUST_WORKS;
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else
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2012-03-05 18:07:08 +00:00
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method = gen_method[remote_io][local_io];
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2011-12-22 00:12:12 +00:00
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/* If not bonding, don't ask user to confirm a Zero TK */
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if (!(auth & SMP_AUTH_BONDING) && method == JUST_CFM)
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method = JUST_WORKS;
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/* If Just Works, Continue with Zero TK */
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if (method == JUST_WORKS) {
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set_bit(SMP_FLAG_TK_VALID, &smp->smp_flags);
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|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Not Just Works/Confirm results in MITM Authentication */
|
|
|
|
if (method != JUST_CFM)
|
|
|
|
set_bit(SMP_FLAG_MITM_AUTH, &smp->smp_flags);
|
|
|
|
|
|
|
|
/* If both devices have Keyoard-Display I/O, the master
|
|
|
|
* Confirms and the slave Enters the passkey.
|
|
|
|
*/
|
|
|
|
if (method == OVERLAP) {
|
|
|
|
if (hcon->link_mode & HCI_LM_MASTER)
|
|
|
|
method = CFM_PASSKEY;
|
|
|
|
else
|
|
|
|
method = REQ_PASSKEY;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Generate random passkey. Not valid until confirmed. */
|
|
|
|
if (method == CFM_PASSKEY) {
|
|
|
|
u8 key[16];
|
|
|
|
|
|
|
|
memset(key, 0, sizeof(key));
|
|
|
|
get_random_bytes(&passkey, sizeof(passkey));
|
|
|
|
passkey %= 1000000;
|
|
|
|
put_unaligned_le32(passkey, key);
|
|
|
|
swap128(key, smp->tk);
|
|
|
|
BT_DBG("PassKey: %d", passkey);
|
|
|
|
}
|
|
|
|
|
|
|
|
hci_dev_lock(hcon->hdev);
|
|
|
|
|
|
|
|
if (method == REQ_PASSKEY)
|
2012-02-09 13:26:12 +00:00
|
|
|
ret = mgmt_user_passkey_request(hcon->hdev, conn->dst,
|
|
|
|
hcon->type, hcon->dst_type);
|
2011-12-22 00:12:12 +00:00
|
|
|
else
|
|
|
|
ret = mgmt_user_confirm_request(hcon->hdev, conn->dst,
|
2012-02-09 13:26:12 +00:00
|
|
|
hcon->type, hcon->dst_type,
|
2011-12-22 00:12:12 +00:00
|
|
|
cpu_to_le32(passkey), 0);
|
|
|
|
|
|
|
|
hci_dev_unlock(hcon->hdev);
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2011-09-05 17:31:31 +00:00
|
|
|
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,
|
2012-03-08 04:25:00 +00:00
|
|
|
conn->src, conn->hcon->dst_type, conn->dst, res);
|
2011-09-05 17:31:31 +00:00
|
|
|
else
|
|
|
|
ret = smp_c1(tfm, smp->tk, smp->prnd, smp->preq, smp->prsp,
|
2012-03-08 04:25:00 +00:00
|
|
|
conn->hcon->dst_type, conn->dst, 0, conn->src,
|
|
|
|
res);
|
2011-09-05 17:31:31 +00:00
|
|
|
if (ret) {
|
|
|
|
reason = SMP_UNSPECIFIED;
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
|
2011-12-22 00:12:12 +00:00
|
|
|
clear_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags);
|
|
|
|
|
2011-09-05 17:31:31 +00:00
|
|
|
swap128(res, cp.confirm_val);
|
|
|
|
smp_send_cmd(smp->conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
|
|
|
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
error:
|
2011-11-23 16:28:36 +00:00
|
|
|
smp_failure(conn, reason, 1);
|
2011-09-05 17:31:31 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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,
|
2012-03-08 04:25:00 +00:00
|
|
|
conn->src, hcon->dst_type, conn->dst, res);
|
2011-09-05 17:31:31 +00:00
|
|
|
else
|
|
|
|
ret = smp_c1(tfm, smp->tk, smp->rrnd, smp->preq, smp->prsp,
|
2012-03-08 04:25:00 +00:00
|
|
|
hcon->dst_type, conn->dst, 0, conn->src, res);
|
2011-09-05 17:31:31 +00:00
|
|
|
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);
|
|
|
|
|
2012-01-30 22:29:12 +00:00
|
|
|
memset(stk + smp->enc_key_size, 0,
|
2012-03-08 04:25:00 +00:00
|
|
|
SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size);
|
2011-09-05 17:31:31 +00:00
|
|
|
|
2012-01-16 04:10:31 +00:00
|
|
|
if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags)) {
|
2011-09-05 17:31:31 +00:00
|
|
|
reason = SMP_UNSPECIFIED;
|
|
|
|
goto error;
|
|
|
|
}
|
|
|
|
|
|
|
|
hci_le_start_enc(hcon, ediv, rand, stk);
|
2012-01-30 22:29:12 +00:00
|
|
|
hcon->enc_key_size = smp->enc_key_size;
|
2011-09-05 17:31:31 +00:00
|
|
|
} 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);
|
|
|
|
|
2012-01-30 22:29:12 +00:00
|
|
|
memset(stk + smp->enc_key_size, 0,
|
|
|
|
SMP_MAX_ENC_KEY_SIZE - smp->enc_key_size);
|
2011-09-05 17:31:31 +00:00
|
|
|
|
2012-02-03 00:08:01 +00:00
|
|
|
hci_add_ltk(hcon->hdev, conn->dst, hcon->dst_type,
|
2012-03-08 04:25:00 +00:00
|
|
|
HCI_SMP_STK_SLAVE, 0, 0, stk, smp->enc_key_size,
|
|
|
|
ediv, rand);
|
2011-09-05 17:31:31 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
return;
|
|
|
|
|
|
|
|
error:
|
2011-11-23 16:28:36 +00:00
|
|
|
smp_failure(conn, reason, 1);
|
2011-09-05 17:31:31 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
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;
|
2011-12-22 00:12:12 +00:00
|
|
|
conn->hcon->smp_conn = conn;
|
2011-09-05 17:31:31 +00:00
|
|
|
|
|
|
|
hci_conn_hold(conn->hcon);
|
|
|
|
|
|
|
|
return smp;
|
|
|
|
}
|
|
|
|
|
|
|
|
void smp_chan_destroy(struct l2cap_conn *conn)
|
|
|
|
{
|
2011-11-23 16:28:35 +00:00
|
|
|
struct smp_chan *smp = conn->smp_chan;
|
|
|
|
|
2012-02-01 21:27:56 +00:00
|
|
|
BUG_ON(!smp);
|
2011-11-23 16:28:35 +00:00
|
|
|
|
|
|
|
if (smp->tfm)
|
|
|
|
crypto_free_blkcipher(smp->tfm);
|
|
|
|
|
|
|
|
kfree(smp);
|
|
|
|
conn->smp_chan = NULL;
|
2011-12-22 00:12:12 +00:00
|
|
|
conn->hcon->smp_conn = NULL;
|
2011-09-05 17:31:31 +00:00
|
|
|
hci_conn_put(conn->hcon);
|
|
|
|
}
|
|
|
|
|
2011-12-22 00:12:12 +00:00
|
|
|
int smp_user_confirm_reply(struct hci_conn *hcon, u16 mgmt_op, __le32 passkey)
|
|
|
|
{
|
|
|
|
struct l2cap_conn *conn = hcon->smp_conn;
|
|
|
|
struct smp_chan *smp;
|
|
|
|
u32 value;
|
|
|
|
u8 key[16];
|
|
|
|
|
|
|
|
BT_DBG("");
|
|
|
|
|
|
|
|
if (!conn)
|
|
|
|
return -ENOTCONN;
|
|
|
|
|
|
|
|
smp = conn->smp_chan;
|
|
|
|
|
|
|
|
switch (mgmt_op) {
|
|
|
|
case MGMT_OP_USER_PASSKEY_REPLY:
|
|
|
|
value = le32_to_cpu(passkey);
|
|
|
|
memset(key, 0, sizeof(key));
|
|
|
|
BT_DBG("PassKey: %d", value);
|
|
|
|
put_unaligned_le32(value, key);
|
|
|
|
swap128(key, smp->tk);
|
|
|
|
/* Fall Through */
|
|
|
|
case MGMT_OP_USER_CONFIRM_REPLY:
|
|
|
|
set_bit(SMP_FLAG_TK_VALID, &smp->smp_flags);
|
|
|
|
break;
|
|
|
|
case MGMT_OP_USER_PASSKEY_NEG_REPLY:
|
|
|
|
case MGMT_OP_USER_CONFIRM_NEG_REPLY:
|
|
|
|
smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED, 1);
|
|
|
|
return 0;
|
|
|
|
default:
|
|
|
|
smp_failure(conn, SMP_PASSKEY_ENTRY_FAILED, 1);
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* 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);
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-06-09 21:50:53 +00:00
|
|
|
static u8 smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
|
2011-06-09 21:50:42 +00:00
|
|
|
{
|
2011-06-14 16:37:42 +00:00
|
|
|
struct smp_cmd_pairing rsp, *req = (void *) skb->data;
|
2011-09-05 17:31:31 +00:00
|
|
|
struct smp_chan *smp;
|
2011-06-14 16:37:42 +00:00
|
|
|
u8 key_size;
|
2011-12-22 00:12:12 +00:00
|
|
|
u8 auth = SMP_AUTH_NONE;
|
2011-09-05 17:31:31 +00:00
|
|
|
int ret;
|
2011-06-09 21:50:42 +00:00
|
|
|
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
|
2011-12-22 00:12:12 +00:00
|
|
|
if (conn->hcon->link_mode & HCI_LM_MASTER)
|
|
|
|
return SMP_CMD_NOTSUPP;
|
|
|
|
|
2012-01-16 04:10:31 +00:00
|
|
|
if (!test_and_set_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags))
|
2011-09-05 17:31:31 +00:00
|
|
|
smp = smp_chan_create(conn);
|
2012-07-19 14:03:43 +00:00
|
|
|
else
|
|
|
|
smp = conn->smp_chan;
|
2011-09-05 17:31:31 +00:00
|
|
|
|
2012-07-19 14:03:43 +00:00
|
|
|
if (!smp)
|
|
|
|
return SMP_UNSPECIFIED;
|
2011-08-20 00:06:51 +00:00
|
|
|
|
2011-09-05 17:31:30 +00:00
|
|
|
smp->preq[0] = SMP_CMD_PAIRING_REQ;
|
|
|
|
memcpy(&smp->preq[1], req, sizeof(*req));
|
2011-06-14 16:37:42 +00:00
|
|
|
skb_pull(skb, sizeof(*req));
|
2011-06-09 21:50:42 +00:00
|
|
|
|
2011-12-22 00:12:12 +00:00
|
|
|
/* We didn't start the pairing, so match remote */
|
|
|
|
if (req->auth_req & SMP_AUTH_BONDING)
|
|
|
|
auth = req->auth_req;
|
2011-06-09 21:50:53 +00:00
|
|
|
|
2012-03-05 18:09:38 +00:00
|
|
|
conn->hcon->pending_sec_level = authreq_to_seclevel(auth);
|
|
|
|
|
2011-12-22 00:12:12 +00:00
|
|
|
build_pairing_cmd(conn, req, &rsp, auth);
|
2011-06-14 16:37:42 +00:00
|
|
|
|
|
|
|
key_size = min(req->max_key_size, rsp.max_key_size);
|
|
|
|
if (check_enc_key_size(conn, key_size))
|
|
|
|
return SMP_ENC_KEY_SIZE;
|
2011-06-09 21:50:42 +00:00
|
|
|
|
2011-09-05 17:31:31 +00:00
|
|
|
ret = smp_rand(smp->prnd);
|
|
|
|
if (ret)
|
|
|
|
return SMP_UNSPECIFIED;
|
|
|
|
|
2011-09-05 17:31:30 +00:00
|
|
|
smp->prsp[0] = SMP_CMD_PAIRING_RSP;
|
|
|
|
memcpy(&smp->prsp[1], &rsp, sizeof(rsp));
|
2011-06-09 21:50:45 +00:00
|
|
|
|
2011-06-14 16:37:42 +00:00
|
|
|
smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(rsp), &rsp);
|
2011-06-09 21:50:53 +00:00
|
|
|
|
2011-12-22 00:12:12 +00:00
|
|
|
/* Request setup of TK */
|
|
|
|
ret = tk_request(conn, 0, auth, rsp.io_capability, req->io_capability);
|
|
|
|
if (ret)
|
|
|
|
return SMP_UNSPECIFIED;
|
|
|
|
|
2011-06-09 21:50:53 +00:00
|
|
|
return 0;
|
2011-06-09 21:50:42 +00:00
|
|
|
}
|
|
|
|
|
2011-06-09 21:50:53 +00:00
|
|
|
static u8 smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
|
2011-06-09 21:50:42 +00:00
|
|
|
{
|
2011-06-14 16:37:42 +00:00
|
|
|
struct smp_cmd_pairing *req, *rsp = (void *) skb->data;
|
2011-09-05 17:31:30 +00:00
|
|
|
struct smp_chan *smp = conn->smp_chan;
|
2011-09-05 17:31:31 +00:00
|
|
|
struct hci_dev *hdev = conn->hcon->hdev;
|
2011-12-22 00:12:12 +00:00
|
|
|
u8 key_size, auth = SMP_AUTH_NONE;
|
2011-06-09 21:50:46 +00:00
|
|
|
int ret;
|
2011-06-09 21:50:42 +00:00
|
|
|
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
|
2011-12-22 00:12:12 +00:00
|
|
|
if (!(conn->hcon->link_mode & HCI_LM_MASTER))
|
|
|
|
return SMP_CMD_NOTSUPP;
|
|
|
|
|
2011-06-14 16:37:42 +00:00
|
|
|
skb_pull(skb, sizeof(*rsp));
|
|
|
|
|
2011-09-05 17:31:30 +00:00
|
|
|
req = (void *) &smp->preq[1];
|
2011-06-09 21:50:53 +00:00
|
|
|
|
2011-06-14 16:37:42 +00:00
|
|
|
key_size = min(req->max_key_size, rsp->max_key_size);
|
|
|
|
if (check_enc_key_size(conn, key_size))
|
|
|
|
return SMP_ENC_KEY_SIZE;
|
|
|
|
|
2011-09-05 17:31:30 +00:00
|
|
|
ret = smp_rand(smp->prnd);
|
2011-06-09 21:50:46 +00:00
|
|
|
if (ret)
|
2011-06-09 21:50:53 +00:00
|
|
|
return SMP_UNSPECIFIED;
|
2011-06-09 21:50:46 +00:00
|
|
|
|
2011-09-05 17:31:31 +00:00
|
|
|
smp->prsp[0] = SMP_CMD_PAIRING_RSP;
|
|
|
|
memcpy(&smp->prsp[1], rsp, sizeof(*rsp));
|
2011-06-09 21:50:46 +00:00
|
|
|
|
2011-12-22 00:12:12 +00:00
|
|
|
if ((req->auth_req & SMP_AUTH_BONDING) &&
|
|
|
|
(rsp->auth_req & SMP_AUTH_BONDING))
|
|
|
|
auth = SMP_AUTH_BONDING;
|
|
|
|
|
|
|
|
auth |= (req->auth_req | rsp->auth_req) & SMP_AUTH_MITM;
|
|
|
|
|
2012-06-06 10:54:15 +00:00
|
|
|
ret = tk_request(conn, 0, auth, req->io_capability, rsp->io_capability);
|
2011-12-22 00:12:12 +00:00
|
|
|
if (ret)
|
|
|
|
return SMP_UNSPECIFIED;
|
|
|
|
|
|
|
|
set_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags);
|
|
|
|
|
|
|
|
/* Can't compose response until we have been confirmed */
|
|
|
|
if (!test_bit(SMP_FLAG_TK_VALID, &smp->smp_flags))
|
|
|
|
return 0;
|
|
|
|
|
2011-09-05 17:31:31 +00:00
|
|
|
queue_work(hdev->workqueue, &smp->confirm);
|
2011-06-09 21:50:53 +00:00
|
|
|
|
|
|
|
return 0;
|
2011-06-09 21:50:42 +00:00
|
|
|
}
|
|
|
|
|
2011-06-09 21:50:53 +00:00
|
|
|
static u8 smp_cmd_pairing_confirm(struct l2cap_conn *conn, struct sk_buff *skb)
|
2011-06-09 21:50:42 +00:00
|
|
|
{
|
2011-09-05 17:31:30 +00:00
|
|
|
struct smp_chan *smp = conn->smp_chan;
|
2011-09-05 17:31:31 +00:00
|
|
|
struct hci_dev *hdev = conn->hcon->hdev;
|
2011-06-09 21:50:46 +00:00
|
|
|
|
2011-06-09 21:50:42 +00:00
|
|
|
BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
|
|
|
|
|
2011-09-05 17:31:30 +00:00
|
|
|
memcpy(smp->pcnf, skb->data, sizeof(smp->pcnf));
|
|
|
|
skb_pull(skb, sizeof(smp->pcnf));
|
2011-06-09 21:50:42 +00:00
|
|
|
|
2011-06-09 21:50:46 +00:00
|
|
|
if (conn->hcon->out) {
|
|
|
|
u8 random[16];
|
2011-06-09 21:50:42 +00:00
|
|
|
|
2011-09-05 17:31:30 +00:00
|
|
|
swap128(smp->prnd, random);
|
2011-06-09 21:50:42 +00:00
|
|
|
smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(random),
|
2011-06-09 21:50:46 +00:00
|
|
|
random);
|
2011-12-22 00:12:12 +00:00
|
|
|
} else if (test_bit(SMP_FLAG_TK_VALID, &smp->smp_flags)) {
|
2011-09-05 17:31:31 +00:00
|
|
|
queue_work(hdev->workqueue, &smp->confirm);
|
2011-12-22 00:12:12 +00:00
|
|
|
} else {
|
|
|
|
set_bit(SMP_FLAG_CFM_PENDING, &smp->smp_flags);
|
2011-06-09 21:50:42 +00:00
|
|
|
}
|
2011-06-09 21:50:53 +00:00
|
|
|
|
|
|
|
return 0;
|
2011-06-09 21:50:42 +00:00
|
|
|
}
|
|
|
|
|
2011-06-09 21:50:53 +00:00
|
|
|
static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
|
2011-06-09 21:50:42 +00:00
|
|
|
{
|
2011-09-05 17:31:30 +00:00
|
|
|
struct smp_chan *smp = conn->smp_chan;
|
2011-09-05 17:31:31 +00:00
|
|
|
struct hci_dev *hdev = conn->hcon->hdev;
|
2011-06-09 21:50:46 +00:00
|
|
|
|
2011-09-05 17:31:31 +00:00
|
|
|
BT_DBG("conn %p", conn);
|
2011-06-14 16:37:42 +00:00
|
|
|
|
2011-09-05 17:31:31 +00:00
|
|
|
swap128(skb->data, smp->rrnd);
|
|
|
|
skb_pull(skb, sizeof(smp->rrnd));
|
2011-07-07 21:59:40 +00:00
|
|
|
|
2011-09-05 17:31:31 +00:00
|
|
|
queue_work(hdev->workqueue, &smp->random);
|
2011-06-09 21:50:53 +00:00
|
|
|
|
|
|
|
return 0;
|
2011-06-09 21:50:42 +00:00
|
|
|
}
|
|
|
|
|
2012-06-07 06:58:37 +00:00
|
|
|
static u8 smp_ltk_encrypt(struct l2cap_conn *conn, u8 sec_level)
|
2011-08-25 23:02:28 +00:00
|
|
|
{
|
2012-02-03 00:08:01 +00:00
|
|
|
struct smp_ltk *key;
|
2011-08-25 23:02:28 +00:00
|
|
|
struct hci_conn *hcon = conn->hcon;
|
|
|
|
|
2012-02-03 00:08:01 +00:00
|
|
|
key = hci_find_ltk_by_addr(hcon->hdev, conn->dst, hcon->dst_type);
|
2011-08-25 23:02:28 +00:00
|
|
|
if (!key)
|
|
|
|
return 0;
|
|
|
|
|
2012-06-07 06:58:37 +00:00
|
|
|
if (sec_level > BT_SECURITY_MEDIUM && !key->authenticated)
|
|
|
|
return 0;
|
|
|
|
|
2012-01-16 04:10:31 +00:00
|
|
|
if (test_and_set_bit(HCI_CONN_ENCRYPT_PEND, &hcon->flags))
|
2011-08-25 23:02:28 +00:00
|
|
|
return 1;
|
|
|
|
|
2012-02-03 00:08:01 +00:00
|
|
|
hci_le_start_enc(hcon, key->ediv, key->rand, key->val);
|
|
|
|
hcon->enc_key_size = key->enc_size;
|
2011-08-25 23:02:28 +00:00
|
|
|
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
}
|
2011-06-09 21:50:53 +00:00
|
|
|
static u8 smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
|
2011-06-09 21:50:42 +00:00
|
|
|
{
|
|
|
|
struct smp_cmd_security_req *rp = (void *) skb->data;
|
|
|
|
struct smp_cmd_pairing cp;
|
2011-01-27 00:42:57 +00:00
|
|
|
struct hci_conn *hcon = conn->hcon;
|
2011-09-05 17:31:31 +00:00
|
|
|
struct smp_chan *smp;
|
2011-06-09 21:50:42 +00:00
|
|
|
|
|
|
|
BT_DBG("conn %p", conn);
|
|
|
|
|
2011-12-22 00:12:12 +00:00
|
|
|
hcon->pending_sec_level = authreq_to_seclevel(rp->auth_req);
|
2011-08-25 23:02:35 +00:00
|
|
|
|
2012-06-07 06:58:37 +00:00
|
|
|
if (smp_ltk_encrypt(conn, hcon->pending_sec_level))
|
2011-08-25 23:02:28 +00:00
|
|
|
return 0;
|
|
|
|
|
2012-01-16 04:10:31 +00:00
|
|
|
if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags))
|
2011-06-09 21:50:53 +00:00
|
|
|
return 0;
|
2011-01-27 00:42:57 +00:00
|
|
|
|
2011-09-05 17:31:31 +00:00
|
|
|
smp = smp_chan_create(conn);
|
2011-08-20 00:06:51 +00:00
|
|
|
|
2011-06-09 21:50:42 +00:00
|
|
|
skb_pull(skb, sizeof(*rp));
|
|
|
|
|
2011-06-09 21:50:53 +00:00
|
|
|
memset(&cp, 0, sizeof(cp));
|
2011-07-07 21:59:38 +00:00
|
|
|
build_pairing_cmd(conn, &cp, NULL, rp->auth_req);
|
2011-06-09 21:50:42 +00:00
|
|
|
|
2011-09-05 17:31:30 +00:00
|
|
|
smp->preq[0] = SMP_CMD_PAIRING_REQ;
|
|
|
|
memcpy(&smp->preq[1], &cp, sizeof(cp));
|
2011-06-09 21:50:45 +00:00
|
|
|
|
2011-06-09 21:50:42 +00:00
|
|
|
smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
|
2011-01-27 00:42:57 +00:00
|
|
|
|
2011-06-09 21:50:53 +00:00
|
|
|
return 0;
|
2011-06-09 21:50:42 +00:00
|
|
|
}
|
|
|
|
|
2012-08-24 00:32:43 +00:00
|
|
|
int smp_conn_security(struct hci_conn *hcon, __u8 sec_level)
|
2011-06-09 21:50:40 +00:00
|
|
|
{
|
2012-08-24 00:32:43 +00:00
|
|
|
struct l2cap_conn *conn = hcon->l2cap_data;
|
2011-09-05 17:31:30 +00:00
|
|
|
struct smp_chan *smp = conn->smp_chan;
|
2011-12-22 00:12:12 +00:00
|
|
|
__u8 authreq;
|
2011-06-09 21:50:40 +00:00
|
|
|
|
2011-06-09 21:50:43 +00:00
|
|
|
BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level);
|
|
|
|
|
2011-06-30 22:20:56 +00:00
|
|
|
if (!lmp_host_le_capable(hcon->hdev))
|
|
|
|
return 1;
|
|
|
|
|
2011-01-27 00:42:57 +00:00
|
|
|
if (sec_level == BT_SECURITY_LOW)
|
|
|
|
return 1;
|
2011-06-09 21:50:40 +00:00
|
|
|
|
2011-01-27 00:42:57 +00:00
|
|
|
if (hcon->sec_level >= sec_level)
|
2011-06-09 21:50:40 +00:00
|
|
|
return 1;
|
2011-01-27 00:42:57 +00:00
|
|
|
|
2011-08-25 23:02:28 +00:00
|
|
|
if (hcon->link_mode & HCI_LM_MASTER)
|
2012-06-07 06:58:37 +00:00
|
|
|
if (smp_ltk_encrypt(conn, sec_level))
|
2011-07-07 21:59:41 +00:00
|
|
|
goto done;
|
2011-08-20 00:06:51 +00:00
|
|
|
|
2012-01-16 04:10:31 +00:00
|
|
|
if (test_and_set_bit(HCI_CONN_LE_SMP_PEND, &hcon->flags))
|
2011-08-20 00:06:51 +00:00
|
|
|
return 0;
|
|
|
|
|
2011-09-05 17:31:31 +00:00
|
|
|
smp = smp_chan_create(conn);
|
2011-12-22 00:12:12 +00:00
|
|
|
if (!smp)
|
|
|
|
return 1;
|
|
|
|
|
|
|
|
authreq = seclevel_to_authreq(sec_level);
|
2011-08-20 00:06:51 +00:00
|
|
|
|
|
|
|
if (hcon->link_mode & HCI_LM_MASTER) {
|
|
|
|
struct smp_cmd_pairing cp;
|
2011-06-09 21:50:45 +00:00
|
|
|
|
2011-12-22 00:12:12 +00:00
|
|
|
build_pairing_cmd(conn, &cp, NULL, authreq);
|
2011-09-05 17:31:30 +00:00
|
|
|
smp->preq[0] = SMP_CMD_PAIRING_REQ;
|
|
|
|
memcpy(&smp->preq[1], &cp, sizeof(cp));
|
2011-06-09 21:50:45 +00:00
|
|
|
|
2011-06-09 21:50:40 +00:00
|
|
|
smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
|
|
|
|
} else {
|
|
|
|
struct smp_cmd_security_req cp;
|
2011-12-22 00:12:12 +00:00
|
|
|
cp.auth_req = authreq;
|
2011-06-09 21:50:40 +00:00
|
|
|
smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp);
|
|
|
|
}
|
|
|
|
|
2011-07-07 21:59:41 +00:00
|
|
|
done:
|
2011-01-27 00:42:57 +00:00
|
|
|
hcon->pending_sec_level = sec_level;
|
|
|
|
|
2011-06-09 21:50:40 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-07-07 21:59:34 +00:00
|
|
|
static int smp_cmd_encrypt_info(struct l2cap_conn *conn, struct sk_buff *skb)
|
|
|
|
{
|
2011-07-07 21:59:39 +00:00
|
|
|
struct smp_cmd_encrypt_info *rp = (void *) skb->data;
|
2011-09-05 17:31:30 +00:00
|
|
|
struct smp_chan *smp = conn->smp_chan;
|
2011-07-07 21:59:39 +00:00
|
|
|
|
|
|
|
skb_pull(skb, sizeof(*rp));
|
|
|
|
|
2011-09-05 17:31:30 +00:00
|
|
|
memcpy(smp->tk, rp->ltk, sizeof(smp->tk));
|
2011-07-07 21:59:39 +00:00
|
|
|
|
2011-07-07 21:59:34 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int smp_cmd_master_ident(struct l2cap_conn *conn, struct sk_buff *skb)
|
|
|
|
{
|
2011-07-07 21:59:39 +00:00
|
|
|
struct smp_cmd_master_ident *rp = (void *) skb->data;
|
2011-09-05 17:31:30 +00:00
|
|
|
struct smp_chan *smp = conn->smp_chan;
|
2012-02-03 00:08:01 +00:00
|
|
|
struct hci_dev *hdev = conn->hcon->hdev;
|
|
|
|
struct hci_conn *hcon = conn->hcon;
|
|
|
|
u8 authenticated;
|
2011-07-07 21:59:39 +00:00
|
|
|
|
|
|
|
skb_pull(skb, sizeof(*rp));
|
2011-07-07 21:59:34 +00:00
|
|
|
|
2012-02-03 00:08:01 +00:00
|
|
|
hci_dev_lock(hdev);
|
|
|
|
authenticated = (conn->hcon->sec_level == BT_SECURITY_HIGH);
|
|
|
|
hci_add_ltk(conn->hcon->hdev, conn->dst, hcon->dst_type,
|
2012-03-08 04:25:00 +00:00
|
|
|
HCI_SMP_LTK, 1, authenticated, smp->tk, smp->enc_key_size,
|
|
|
|
rp->ediv, rp->rand);
|
2011-07-07 21:59:34 +00:00
|
|
|
smp_distribute_keys(conn, 1);
|
2012-02-03 00:08:01 +00:00
|
|
|
hci_dev_unlock(hdev);
|
2011-07-07 21:59:34 +00:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2011-06-09 21:50:40 +00:00
|
|
|
int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
__u8 code = skb->data[0];
|
|
|
|
__u8 reason;
|
|
|
|
int err = 0;
|
|
|
|
|
2011-06-30 22:20:56 +00:00
|
|
|
if (!lmp_host_le_capable(conn->hcon->hdev)) {
|
|
|
|
err = -ENOTSUPP;
|
|
|
|
reason = SMP_PAIRING_NOTSUPP;
|
|
|
|
goto done;
|
|
|
|
}
|
|
|
|
|
2011-06-09 21:50:40 +00:00
|
|
|
skb_pull(skb, sizeof(code));
|
|
|
|
|
2013-01-29 16:44:23 +00:00
|
|
|
/*
|
|
|
|
* The SMP context must be initialized for all other PDUs except
|
|
|
|
* pairing and security requests. If we get any other PDU when
|
|
|
|
* not initialized simply disconnect (done if this function
|
|
|
|
* returns an error).
|
|
|
|
*/
|
|
|
|
if (code != SMP_CMD_PAIRING_REQ && code != SMP_CMD_SECURITY_REQ &&
|
|
|
|
!conn->smp_chan) {
|
|
|
|
BT_ERR("Unexpected SMP command 0x%02x. Disconnecting.", code);
|
|
|
|
kfree_skb(skb);
|
|
|
|
return -ENOTSUPP;
|
|
|
|
}
|
|
|
|
|
2011-06-09 21:50:40 +00:00
|
|
|
switch (code) {
|
|
|
|
case SMP_CMD_PAIRING_REQ:
|
2011-06-09 21:50:53 +00:00
|
|
|
reason = smp_cmd_pairing_req(conn, skb);
|
2011-06-09 21:50:40 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
case SMP_CMD_PAIRING_FAIL:
|
2011-11-23 16:28:36 +00:00
|
|
|
smp_failure(conn, skb->data[0], 0);
|
2011-06-09 21:50:53 +00:00
|
|
|
reason = 0;
|
|
|
|
err = -EPERM;
|
2011-06-09 21:50:40 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
case SMP_CMD_PAIRING_RSP:
|
2011-06-09 21:50:53 +00:00
|
|
|
reason = smp_cmd_pairing_rsp(conn, skb);
|
2011-06-09 21:50:42 +00:00
|
|
|
break;
|
|
|
|
|
|
|
|
case SMP_CMD_SECURITY_REQ:
|
2011-06-09 21:50:53 +00:00
|
|
|
reason = smp_cmd_security_req(conn, skb);
|
2011-06-09 21:50:42 +00:00
|
|
|
break;
|
|
|
|
|
2011-06-09 21:50:40 +00:00
|
|
|
case SMP_CMD_PAIRING_CONFIRM:
|
2011-06-09 21:50:53 +00:00
|
|
|
reason = smp_cmd_pairing_confirm(conn, skb);
|
2011-06-09 21:50:42 +00:00
|
|
|
break;
|
|
|
|
|
2011-06-09 21:50:40 +00:00
|
|
|
case SMP_CMD_PAIRING_RANDOM:
|
2011-06-09 21:50:53 +00:00
|
|
|
reason = smp_cmd_pairing_random(conn, skb);
|
2011-06-09 21:50:42 +00:00
|
|
|
break;
|
|
|
|
|
2011-06-09 21:50:40 +00:00
|
|
|
case SMP_CMD_ENCRYPT_INFO:
|
2011-07-07 21:59:34 +00:00
|
|
|
reason = smp_cmd_encrypt_info(conn, skb);
|
|
|
|
break;
|
|
|
|
|
2011-06-09 21:50:40 +00:00
|
|
|
case SMP_CMD_MASTER_IDENT:
|
2011-07-07 21:59:34 +00:00
|
|
|
reason = smp_cmd_master_ident(conn, skb);
|
|
|
|
break;
|
|
|
|
|
2011-06-09 21:50:40 +00:00
|
|
|
case SMP_CMD_IDENT_INFO:
|
|
|
|
case SMP_CMD_IDENT_ADDR_INFO:
|
|
|
|
case SMP_CMD_SIGN_INFO:
|
2011-07-07 21:59:34 +00:00
|
|
|
/* Just ignored */
|
|
|
|
reason = 0;
|
|
|
|
break;
|
|
|
|
|
2011-06-09 21:50:40 +00:00
|
|
|
default:
|
|
|
|
BT_DBG("Unknown command code 0x%2.2x", code);
|
|
|
|
|
|
|
|
reason = SMP_CMD_NOTSUPP;
|
|
|
|
err = -EOPNOTSUPP;
|
2011-06-09 21:50:43 +00:00
|
|
|
goto done;
|
2011-06-09 21:50:40 +00:00
|
|
|
}
|
|
|
|
|
2011-06-09 21:50:43 +00:00
|
|
|
done:
|
|
|
|
if (reason)
|
2011-11-23 16:28:36 +00:00
|
|
|
smp_failure(conn, reason, 1);
|
2011-06-09 21:50:43 +00:00
|
|
|
|
2011-06-09 21:50:40 +00:00
|
|
|
kfree_skb(skb);
|
|
|
|
return err;
|
|
|
|
}
|
2011-07-07 21:59:34 +00:00
|
|
|
|
|
|
|
int smp_distribute_keys(struct l2cap_conn *conn, __u8 force)
|
|
|
|
{
|
|
|
|
struct smp_cmd_pairing *req, *rsp;
|
2011-09-05 17:31:30 +00:00
|
|
|
struct smp_chan *smp = conn->smp_chan;
|
2011-07-07 21:59:34 +00:00
|
|
|
__u8 *keydist;
|
|
|
|
|
|
|
|
BT_DBG("conn %p force %d", conn, force);
|
|
|
|
|
2012-01-16 04:10:31 +00:00
|
|
|
if (!test_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags))
|
2011-08-20 00:06:51 +00:00
|
|
|
return 0;
|
|
|
|
|
2011-09-05 17:31:30 +00:00
|
|
|
rsp = (void *) &smp->prsp[1];
|
2011-07-07 21:59:34 +00:00
|
|
|
|
|
|
|
/* The responder sends its keys first */
|
|
|
|
if (!force && conn->hcon->out && (rsp->resp_key_dist & 0x07))
|
|
|
|
return 0;
|
|
|
|
|
2011-09-05 17:31:30 +00:00
|
|
|
req = (void *) &smp->preq[1];
|
2011-07-07 21:59:34 +00:00
|
|
|
|
|
|
|
if (conn->hcon->out) {
|
|
|
|
keydist = &rsp->init_key_dist;
|
|
|
|
*keydist &= req->init_key_dist;
|
|
|
|
} else {
|
|
|
|
keydist = &rsp->resp_key_dist;
|
|
|
|
*keydist &= req->resp_key_dist;
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
BT_DBG("keydist 0x%x", *keydist);
|
|
|
|
|
|
|
|
if (*keydist & SMP_DIST_ENC_KEY) {
|
|
|
|
struct smp_cmd_encrypt_info enc;
|
|
|
|
struct smp_cmd_master_ident ident;
|
2012-02-03 00:08:01 +00:00
|
|
|
struct hci_conn *hcon = conn->hcon;
|
|
|
|
u8 authenticated;
|
2011-07-07 21:59:34 +00:00
|
|
|
__le16 ediv;
|
|
|
|
|
|
|
|
get_random_bytes(enc.ltk, sizeof(enc.ltk));
|
|
|
|
get_random_bytes(&ediv, sizeof(ediv));
|
|
|
|
get_random_bytes(ident.rand, sizeof(ident.rand));
|
|
|
|
|
|
|
|
smp_send_cmd(conn, SMP_CMD_ENCRYPT_INFO, sizeof(enc), &enc);
|
|
|
|
|
2012-02-03 00:08:01 +00:00
|
|
|
authenticated = hcon->sec_level == BT_SECURITY_HIGH;
|
|
|
|
hci_add_ltk(conn->hcon->hdev, conn->dst, hcon->dst_type,
|
2012-03-08 04:25:00 +00:00
|
|
|
HCI_SMP_LTK_SLAVE, 1, authenticated,
|
|
|
|
enc.ltk, smp->enc_key_size, ediv, ident.rand);
|
2011-07-07 21:59:39 +00:00
|
|
|
|
2012-03-12 10:13:06 +00:00
|
|
|
ident.ediv = ediv;
|
2011-07-07 21:59:34 +00:00
|
|
|
|
|
|
|
smp_send_cmd(conn, SMP_CMD_MASTER_IDENT, sizeof(ident), &ident);
|
|
|
|
|
|
|
|
*keydist &= ~SMP_DIST_ENC_KEY;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (*keydist & SMP_DIST_ID_KEY) {
|
|
|
|
struct smp_cmd_ident_addr_info addrinfo;
|
|
|
|
struct smp_cmd_ident_info idinfo;
|
|
|
|
|
|
|
|
/* Send a dummy key */
|
|
|
|
get_random_bytes(idinfo.irk, sizeof(idinfo.irk));
|
|
|
|
|
|
|
|
smp_send_cmd(conn, SMP_CMD_IDENT_INFO, sizeof(idinfo), &idinfo);
|
|
|
|
|
|
|
|
/* Just public address */
|
|
|
|
memset(&addrinfo, 0, sizeof(addrinfo));
|
|
|
|
bacpy(&addrinfo.bdaddr, conn->src);
|
|
|
|
|
|
|
|
smp_send_cmd(conn, SMP_CMD_IDENT_ADDR_INFO, sizeof(addrinfo),
|
|
|
|
&addrinfo);
|
|
|
|
|
|
|
|
*keydist &= ~SMP_DIST_ID_KEY;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (*keydist & SMP_DIST_SIGN) {
|
|
|
|
struct smp_cmd_sign_info sign;
|
|
|
|
|
|
|
|
/* Send a dummy key */
|
|
|
|
get_random_bytes(sign.csrk, sizeof(sign.csrk));
|
|
|
|
|
|
|
|
smp_send_cmd(conn, SMP_CMD_SIGN_INFO, sizeof(sign), &sign);
|
|
|
|
|
|
|
|
*keydist &= ~SMP_DIST_SIGN;
|
|
|
|
}
|
|
|
|
|
2011-08-20 00:06:51 +00:00
|
|
|
if (conn->hcon->out || force) {
|
2012-01-16 04:10:31 +00:00
|
|
|
clear_bit(HCI_CONN_LE_SMP_PEND, &conn->hcon->flags);
|
2011-12-20 12:57:27 +00:00
|
|
|
cancel_delayed_work_sync(&conn->security_timer);
|
2011-09-05 17:31:31 +00:00
|
|
|
smp_chan_destroy(conn);
|
2011-08-20 00:06:51 +00:00
|
|
|
}
|
|
|
|
|
2011-07-07 21:59:34 +00:00
|
|
|
return 0;
|
|
|
|
}
|