Bluetooth: Add basic LE SC OOB support for remote OOB data
This patch adds basic OOB pairing support when we've received the remote OOB data. This includes tracking the remote r value (in smp->rr) as well as doing the appropriate f4() call when needed. Previously the OOB rand would have been stored in smp->rrnd however these are actually two independent values so we need separate variables for them. Na/Nb in the spec maps to smp->prnd/rrnd and ra/rb maps to smp->rr with smp->pr to come once local OOB data is supported. Signed-off-by: Johan Hedberg <johan.hedberg@intel.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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@ -71,6 +71,7 @@ struct smp_chan {
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u8 rrnd[16]; /* SMP Pairing Random (remote) */
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u8 pcnf[16]; /* SMP Pairing Confirm */
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u8 tk[16]; /* SMP Temporary Key */
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u8 rr[16];
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u8 enc_key_size;
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u8 remote_key_dist;
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bdaddr_t id_addr;
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@ -599,7 +600,7 @@ static void build_pairing_cmd(struct l2cap_conn *conn,
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if (oob_data) {
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set_bit(SMP_FLAG_OOB, &smp->flags);
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oob_flag = SMP_OOB_PRESENT;
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memcpy(smp->rrnd, oob_data->rand256, 16);
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memcpy(smp->rr, oob_data->rand256, 16);
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memcpy(smp->pcnf, oob_data->hash256, 16);
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}
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@ -1334,6 +1335,9 @@ static void sc_dhkey_check(struct smp_chan *smp)
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if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
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put_unaligned_le32(hcon->passkey_notify, r);
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if (smp->method == REQ_OOB)
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memcpy(r, smp->rr, 16);
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smp_f6(smp->tfm_cmac, smp->mackey, smp->prnd, smp->rrnd, r, io_cap,
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local_addr, remote_addr, check.e);
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@ -1910,6 +1914,14 @@ static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
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if (!test_bit(SMP_FLAG_SC, &smp->flags))
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return smp_random(smp);
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if (smp->method == REQ_OOB) {
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if (!hcon->out)
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smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
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sizeof(smp->prnd), smp->prnd);
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SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
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goto mackey_and_ltk;
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}
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/* Passkey entry has special treatment */
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if (smp->method == REQ_PASSKEY || smp->method == DSP_PASSKEY)
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return sc_passkey_round(smp, SMP_CMD_PAIRING_RANDOM);
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@ -1940,12 +1952,13 @@ static u8 smp_cmd_pairing_random(struct l2cap_conn *conn, struct sk_buff *skb)
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nb = smp->prnd;
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}
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mackey_and_ltk:
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/* Generate MacKey and LTK */
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err = sc_mackey_and_ltk(smp, smp->mackey, smp->tk);
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if (err)
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return SMP_UNSPECIFIED;
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if (smp->method == JUST_WORKS) {
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if (smp->method == JUST_WORKS || smp->method == REQ_OOB) {
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if (hcon->out) {
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sc_dhkey_check(smp);
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SMP_ALLOW_CMD(smp, SMP_CMD_DHKEY_CHECK);
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@ -2314,6 +2327,9 @@ static u8 sc_select_method(struct smp_chan *smp)
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struct smp_cmd_pairing *local, *remote;
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u8 local_mitm, remote_mitm, local_io, remote_io, method;
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if (test_bit(SMP_FLAG_OOB, &smp->flags))
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return REQ_OOB;
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/* The preq/prsp contain the raw Pairing Request/Response PDUs
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* which are needed as inputs to some crypto functions. To get
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* the "struct smp_cmd_pairing" from them we need to skip the
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@ -2412,6 +2428,24 @@ static int smp_cmd_public_key(struct l2cap_conn *conn, struct sk_buff *skb)
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return sc_passkey_round(smp, SMP_CMD_PUBLIC_KEY);
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}
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if (smp->method == REQ_OOB) {
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err = smp_f4(smp->tfm_cmac, smp->remote_pk, smp->remote_pk,
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smp->rr, 0, cfm.confirm_val);
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if (err)
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return SMP_UNSPECIFIED;
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if (memcmp(cfm.confirm_val, smp->pcnf, 16))
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return SMP_CONFIRM_FAILED;
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if (hcon->out)
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smp_send_cmd(conn, SMP_CMD_PAIRING_RANDOM,
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sizeof(smp->prnd), smp->prnd);
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SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_RANDOM);
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return 0;
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}
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if (hcon->out)
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SMP_ALLOW_CMD(smp, SMP_CMD_PAIRING_CONFIRM);
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