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7d24ddcc11
This patch includes support for generating and sending the random value used to produce the confirmation value. Signed-off-by: Anderson Briglia <anderson.briglia@openbossa.org> Signed-off-by: Vinicius Costa Gomes <vinicius.gomes@openbossa.org> Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
461 lines
10 KiB
C
461 lines
10 KiB
C
/*
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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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#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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#include <net/bluetooth/smp.h>
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#include <linux/crypto.h>
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#include <crypto/b128ops.h>
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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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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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lh->cid = cpu_to_le16(L2CAP_CID_SMP);
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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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hci_send_acl(conn->hcon, skb, 0);
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}
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static void smp_cmd_pairing_req(struct l2cap_conn *conn, struct sk_buff *skb)
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{
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struct smp_cmd_pairing *rp = (void *) skb->data;
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BT_DBG("conn %p", conn);
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conn->preq[0] = SMP_CMD_PAIRING_REQ;
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memcpy(&conn->preq[1], rp, sizeof(*rp));
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skb_pull(skb, sizeof(*rp));
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rp->io_capability = 0x00;
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rp->oob_flag = 0x00;
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rp->max_key_size = 16;
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rp->init_key_dist = 0x00;
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rp->resp_key_dist = 0x00;
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rp->auth_req &= (SMP_AUTH_BONDING | SMP_AUTH_MITM);
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/* Just works */
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memset(conn->tk, 0, sizeof(conn->tk));
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conn->prsp[0] = SMP_CMD_PAIRING_RSP;
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memcpy(&conn->prsp[1], rp, sizeof(*rp));
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smp_send_cmd(conn, SMP_CMD_PAIRING_RSP, sizeof(*rp), rp);
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}
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static void smp_cmd_pairing_rsp(struct l2cap_conn *conn, struct sk_buff *skb)
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{
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struct smp_cmd_pairing *rp = (void *) skb->data;
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struct smp_cmd_pairing_confirm cp;
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struct crypto_blkcipher *tfm = conn->hcon->hdev->tfm;
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int ret;
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u8 res[16];
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BT_DBG("conn %p", conn);
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/* Just works */
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memset(conn->tk, 0, sizeof(conn->tk));
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conn->prsp[0] = SMP_CMD_PAIRING_RSP;
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memcpy(&conn->prsp[1], rp, sizeof(*rp));
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skb_pull(skb, sizeof(*rp));
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ret = smp_rand(conn->prnd);
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if (ret)
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return;
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ret = smp_c1(tfm, conn->tk, conn->prnd, conn->preq, conn->prsp, 0,
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conn->src, conn->hcon->dst_type, conn->dst, res);
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if (ret)
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return;
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swap128(res, cp.confirm_val);
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smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
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}
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static void smp_cmd_pairing_confirm(struct l2cap_conn *conn,
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struct sk_buff *skb)
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{
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struct crypto_blkcipher *tfm = conn->hcon->hdev->tfm;
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BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
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memcpy(conn->pcnf, skb->data, sizeof(conn->pcnf));
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skb_pull(skb, sizeof(conn->pcnf));
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if (conn->hcon->out) {
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u8 random[16];
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swap128(conn->prnd, random);
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smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(random),
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random);
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} else {
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struct smp_cmd_pairing_confirm cp;
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int ret;
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u8 res[16];
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ret = smp_rand(conn->prnd);
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if (ret)
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return;
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ret = smp_c1(tfm, conn->tk, conn->prnd, conn->preq, conn->prsp,
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conn->hcon->dst_type, conn->dst,
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0, conn->src, res);
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if (ret)
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return;
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swap128(res, cp.confirm_val);
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smp_send_cmd(conn, SMP_CMD_PAIRING_CONFIRM, sizeof(cp), &cp);
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}
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}
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static void smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
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{
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struct crypto_blkcipher *tfm = conn->hcon->hdev->tfm;
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int ret;
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u8 key[16], res[16], random[16], confirm[16], buf[128];
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swap128(skb->data, random);
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skb_pull(skb, sizeof(random));
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if (conn->hcon->out)
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ret = smp_c1(tfm, conn->tk, random, conn->preq, conn->prsp, 0,
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conn->src, conn->hcon->dst_type, conn->dst,
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res);
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else
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ret = smp_c1(tfm, conn->tk, random, conn->preq, conn->prsp,
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conn->hcon->dst_type, conn->dst, 0, conn->src,
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res);
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if (ret)
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return;
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BT_DBG("conn %p %s", conn, conn->hcon->out ? "master" : "slave");
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swap128(res, confirm);
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if (memcmp(conn->pcnf, confirm, sizeof(conn->pcnf)) != 0) {
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struct smp_cmd_pairing_fail cp;
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BT_ERR("Pairing failed (confirmation values mismatch)");
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cp.reason = SMP_CONFIRM_FAILED;
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smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(cp), &cp);
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return;
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}
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if (conn->hcon->out) {
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smp_s1(tfm, conn->tk, random, conn->prnd, key);
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hex_dump_to_buffer(key, sizeof(key), 16, 1, buf,
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sizeof(buf), 0);
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BT_DBG("key %s", buf);
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} else {
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u8 r[16];
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swap128(conn->prnd, r);
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smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM, sizeof(r), r);
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smp_s1(tfm, conn->tk, conn->prnd, random, key);
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hex_dump_to_buffer(key, sizeof(key), 16, 1, buf,
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sizeof(buf), 0);
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BT_DBG("key %s", buf);
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}
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}
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static void smp_cmd_security_req(struct l2cap_conn *conn, struct sk_buff *skb)
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{
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struct smp_cmd_security_req *rp = (void *) skb->data;
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struct smp_cmd_pairing cp;
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BT_DBG("conn %p", conn);
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skb_pull(skb, sizeof(*rp));
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memset(&cp, 0, sizeof(cp));
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cp.io_capability = 0x00;
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cp.oob_flag = 0x00;
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cp.max_key_size = 16;
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cp.init_key_dist = 0x00;
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cp.resp_key_dist = 0x00;
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cp.auth_req = rp->auth_req & (SMP_AUTH_BONDING | SMP_AUTH_MITM);
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conn->preq[0] = SMP_CMD_PAIRING_REQ;
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memcpy(&conn->preq[1], &cp, sizeof(cp));
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smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
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}
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int smp_conn_security(struct l2cap_conn *conn, __u8 sec_level)
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{
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struct hci_conn *hcon = conn->hcon;
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__u8 authreq;
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BT_DBG("conn %p hcon %p level 0x%2.2x", conn, hcon, sec_level);
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if (IS_ERR(hcon->hdev->tfm))
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return 1;
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switch (sec_level) {
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case BT_SECURITY_MEDIUM:
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/* Encrypted, no MITM protection */
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authreq = HCI_AT_NO_BONDING_MITM;
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break;
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case BT_SECURITY_HIGH:
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/* Bonding, MITM protection */
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authreq = HCI_AT_GENERAL_BONDING_MITM;
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break;
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case BT_SECURITY_LOW:
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default:
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return 1;
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}
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if (hcon->link_mode & HCI_LM_MASTER) {
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struct smp_cmd_pairing cp;
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cp.io_capability = 0x00;
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cp.oob_flag = 0x00;
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cp.max_key_size = 16;
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cp.init_key_dist = 0x00;
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cp.resp_key_dist = 0x00;
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cp.auth_req = authreq;
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conn->preq[0] = SMP_CMD_PAIRING_REQ;
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memcpy(&conn->preq[1], &cp, sizeof(cp));
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smp_send_cmd(conn, SMP_CMD_PAIRING_REQ, sizeof(cp), &cp);
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} else {
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struct smp_cmd_security_req cp;
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cp.auth_req = authreq;
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smp_send_cmd(conn, SMP_CMD_SECURITY_REQ, sizeof(cp), &cp);
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}
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return 0;
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}
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int smp_sig_channel(struct l2cap_conn *conn, struct sk_buff *skb)
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{
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__u8 code = skb->data[0];
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__u8 reason;
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int err = 0;
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if (IS_ERR(conn->hcon->hdev->tfm)) {
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err = PTR_ERR(conn->hcon->hdev->tfm);
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reason = SMP_PAIRING_NOTSUPP;
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goto done;
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}
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skb_pull(skb, sizeof(code));
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switch (code) {
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case SMP_CMD_PAIRING_REQ:
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smp_cmd_pairing_req(conn, skb);
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break;
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case SMP_CMD_PAIRING_FAIL:
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break;
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case SMP_CMD_PAIRING_RSP:
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smp_cmd_pairing_rsp(conn, skb);
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break;
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case SMP_CMD_SECURITY_REQ:
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smp_cmd_security_req(conn, skb);
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break;
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case SMP_CMD_PAIRING_CONFIRM:
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smp_cmd_pairing_confirm(conn, skb);
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break;
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case SMP_CMD_PAIRING_RANDOM:
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smp_cmd_pairing_random(conn, skb);
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break;
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case SMP_CMD_ENCRYPT_INFO:
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case SMP_CMD_MASTER_IDENT:
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case SMP_CMD_IDENT_INFO:
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case SMP_CMD_IDENT_ADDR_INFO:
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case SMP_CMD_SIGN_INFO:
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default:
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BT_DBG("Unknown command code 0x%2.2x", code);
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reason = SMP_CMD_NOTSUPP;
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err = -EOPNOTSUPP;
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goto done;
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}
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done:
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if (reason)
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smp_send_cmd(conn, SMP_CMD_PAIRING_FAIL, sizeof(reason),
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&reason);
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kfree_skb(skb);
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return err;
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}
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