ref: 79728730d7eba048192efcf6a455beecb5db562d
src/libs/mynewt-nimble/nimble/host/mesh/src/prov_device.c
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/* Bluetooth Mesh */ /* * Copyright (c) 2017 Intel Corporation * Copyright (c) 2020 Lingao Meng * * SPDX-License-Identifier: Apache-2.0 */ #define MESH_LOG_MODULE BLE_MESH_PROV_LOG #include "testing.h" #include "crypto.h" #include "adv.h" #include "mesh/mesh.h" #include "net.h" #include "rpl.h" #include "beacon.h" #include "access.h" #include "foundation.h" #include "proxy.h" #include "prov.h" #include "settings.h" static void send_pub_key(void); static void pub_key_ready(const uint8_t *pkey); static int reset_state(void) { return bt_mesh_prov_reset_state(pub_key_ready); } static void prov_send_fail_msg(uint8_t err) { struct os_mbuf *buf = PROV_BUF(2); BT_DBG("%u", err); bt_mesh_prov_link.expect = PROV_NO_PDU; bt_mesh_prov_buf_init(buf, PROV_FAILED); net_buf_simple_add_u8(buf, err); if (bt_mesh_prov_send(buf, NULL)) { BT_ERR("Failed to send Provisioning Failed message"); } } static void prov_fail(uint8_t reason) { /* According to Bluetooth Mesh Specification v1.0.1, Section 5.4.4, the * provisioner just closes the link when something fails, while the * provisionee sends the fail message, and waits for the provisioner to * close the link. */ prov_send_fail_msg(reason); } static void prov_invite(const uint8_t *data) { struct os_mbuf *buf = PROV_BUF(12); BT_DBG("Attention Duration: %u seconds", data[0]); if (data[0]) { bt_mesh_attention(NULL, data[0]); } bt_mesh_prov_link.conf_inputs[0] = data[0]; bt_mesh_prov_buf_init(buf, PROV_CAPABILITIES); /* Number of Elements supported */ net_buf_simple_add_u8(buf, bt_mesh_elem_count()); /* Supported algorithms - FIPS P-256 Eliptic Curve */ net_buf_simple_add_be16(buf, BIT(PROV_ALG_P256)); /* Public Key Type, Only "No OOB" Public Key is supported */ net_buf_simple_add_u8(buf, PUB_KEY_NO_OOB); /* Static OOB Type */ net_buf_simple_add_u8(buf, bt_mesh_prov->static_val ? BIT(0) : 0x00); /* Output OOB Size */ net_buf_simple_add_u8(buf, bt_mesh_prov->output_size); /* Output OOB Action */ net_buf_simple_add_be16(buf, bt_mesh_prov->output_actions); /* Input OOB Size */ net_buf_simple_add_u8(buf, bt_mesh_prov->input_size); /* Input OOB Action */ net_buf_simple_add_be16(buf, bt_mesh_prov->input_actions); memcpy(&bt_mesh_prov_link.conf_inputs[1], &buf->om_data[1], 11); if (bt_mesh_prov_send(buf, NULL)) { BT_ERR("Failed to send capabilities"); return; } bt_mesh_prov_link.expect = PROV_START; } static void prov_start(const uint8_t *data) { BT_DBG("Algorithm: 0x%02x", data[0]); BT_DBG("Public Key: 0x%02x", data[1]); BT_DBG("Auth Method: 0x%02x", data[2]); BT_DBG("Auth Action: 0x%02x", data[3]); BT_DBG("Auth Size: 0x%02x", data[4]); if (data[0] != PROV_ALG_P256) { BT_ERR("Unknown algorithm 0x%02x", data[0]); prov_fail(PROV_ERR_NVAL_FMT); return; } if (data[1] != PUB_KEY_NO_OOB) { BT_ERR("Invalid public key type: 0x%02x", data[1]); prov_fail(PROV_ERR_NVAL_FMT); return; } memcpy(&bt_mesh_prov_link.conf_inputs[12], data, 5); bt_mesh_prov_link.expect = PROV_PUB_KEY; if (bt_mesh_prov_auth(data[2], data[3], data[4]) < 0) { BT_ERR("Invalid authentication method: 0x%02x; " "action: 0x%02x; size: 0x%02x", data[2], data[3], data[4]); prov_fail(PROV_ERR_NVAL_FMT); } if (atomic_test_bit(bt_mesh_prov_link.flags, OOB_STATIC_KEY)) { memcpy(bt_mesh_prov_link.auth + 16 - bt_mesh_prov->static_val_len, bt_mesh_prov->static_val, bt_mesh_prov->static_val_len); (void)memset(bt_mesh_prov_link.auth, 0, sizeof(bt_mesh_prov_link.auth) - bt_mesh_prov->static_val_len); } } static void send_confirm(void) { struct os_mbuf *cfm = PROV_BUF(17); BT_DBG("ConfInputs[0] %s", bt_hex(bt_mesh_prov_link.conf_inputs, 64)); BT_DBG("ConfInputs[64] %s", bt_hex(&bt_mesh_prov_link.conf_inputs[64], 64)); BT_DBG("ConfInputs[128] %s", bt_hex(&bt_mesh_prov_link.conf_inputs[128], 17)); if (bt_mesh_prov_conf_salt(bt_mesh_prov_link.conf_inputs, bt_mesh_prov_link.conf_salt)) { BT_ERR("Unable to generate confirmation salt"); prov_fail(PROV_ERR_UNEXP_ERR); return; } BT_DBG("ConfirmationSalt: %s", bt_hex(bt_mesh_prov_link.conf_salt, 16)); if (bt_mesh_prov_conf_key(bt_mesh_prov_link.dhkey, bt_mesh_prov_link.conf_salt, bt_mesh_prov_link.conf_key)) { BT_ERR("Unable to generate confirmation key"); prov_fail(PROV_ERR_UNEXP_ERR); return; } BT_DBG("ConfirmationKey: %s", bt_hex(bt_mesh_prov_link.conf_key, 16)); if (bt_rand(bt_mesh_prov_link.rand, 16)) { BT_ERR("Unable to generate random number"); prov_fail(PROV_ERR_UNEXP_ERR); return; } BT_DBG("LocalRandom: %s", bt_hex(bt_mesh_prov_link.rand, 16)); bt_mesh_prov_buf_init(cfm, PROV_CONFIRM); if (bt_mesh_prov_conf(bt_mesh_prov_link.conf_key, bt_mesh_prov_link.rand, bt_mesh_prov_link.auth, net_buf_simple_add(cfm, 16))) { BT_ERR("Unable to generate confirmation value"); prov_fail(PROV_ERR_UNEXP_ERR); return; } if (bt_mesh_prov_send(cfm, NULL)) { BT_ERR("Failed to send Provisioning Confirm"); return; } bt_mesh_prov_link.expect = PROV_RANDOM; } static void send_input_complete(void) { struct os_mbuf *buf = PROV_BUF(1); bt_mesh_prov_buf_init(buf, PROV_INPUT_COMPLETE); if (bt_mesh_prov_send(buf, NULL)) { BT_ERR("Failed to send Provisioning Input Complete"); } bt_mesh_prov_link.expect = PROV_CONFIRM; } static void public_key_sent(int err, void *cb_data) { atomic_set_bit(bt_mesh_prov_link.flags, PUB_KEY_SENT); if (atomic_test_bit(bt_mesh_prov_link.flags, INPUT_COMPLETE)) { send_input_complete(); return; } } static void send_pub_key(void) { struct os_mbuf *buf = PROV_BUF(65); const uint8_t *key; key = bt_pub_key_get(); if (!key) { BT_ERR("No public key available"); prov_fail(PROV_ERR_UNEXP_ERR); return; } BT_DBG("Local Public Key: %s", bt_hex(key, 64)); bt_mesh_prov_buf_init(buf, PROV_PUB_KEY); /* Swap X and Y halves independently to big-endian */ sys_memcpy_swap(net_buf_simple_add(buf, 32), key, 32); sys_memcpy_swap(net_buf_simple_add(buf, 32), &key[32], 32); /* PublicKeyRemote */ memcpy(&bt_mesh_prov_link.conf_inputs[81], &buf->om_data[1], 64); if (bt_mesh_prov_send(buf, public_key_sent)) { BT_ERR("Failed to send Public Key"); return; } if (atomic_test_bit(bt_mesh_prov_link.flags, WAIT_NUMBER) || atomic_test_bit(bt_mesh_prov_link.flags, WAIT_STRING)) { bt_mesh_prov_link.expect = PROV_NO_PDU; /* Wait for input */ } else { bt_mesh_prov_link.expect = PROV_CONFIRM; } } static void prov_dh_key_cb(const uint8_t dhkey[32]) { BT_DBG("%p", dhkey); if (!dhkey) { BT_ERR("DHKey generation failed"); prov_fail(PROV_ERR_UNEXP_ERR); return; } sys_memcpy_swap(bt_mesh_prov_link.dhkey, dhkey, 32); BT_DBG("DHkey: %s", bt_hex(bt_mesh_prov_link.dhkey, 32)); send_pub_key(); } static void prov_dh_key_gen(void) { uint8_t remote_pk_le[64], *remote_pk; remote_pk = &bt_mesh_prov_link.conf_inputs[17]; /* Copy remote key in little-endian for bt_dh_key_gen(). * X and Y halves are swapped independently. The bt_dh_key_gen() * will also take care of validating the remote public key. */ sys_memcpy_swap(remote_pk_le, remote_pk, 32); sys_memcpy_swap(&remote_pk_le[32], &remote_pk[32], 32); if (bt_dh_key_gen(remote_pk_le, prov_dh_key_cb)) { BT_ERR("Failed to generate DHKey"); prov_fail(PROV_ERR_UNEXP_ERR); } } static void prov_pub_key(const uint8_t *data) { BT_DBG("Remote Public Key: %s", bt_hex(data, 64)); /* PublicKeyProvisioner */ memcpy(&bt_mesh_prov_link.conf_inputs[17], data, 64); if (!bt_pub_key_get()) { /* Clear retransmit timer */ bt_mesh_prov_link.bearer->clear_tx(); atomic_set_bit(bt_mesh_prov_link.flags, WAIT_PUB_KEY); BT_WARN("Waiting for local public key"); return; } prov_dh_key_gen(); } static void pub_key_ready(const uint8_t *pkey) { if (!pkey) { BT_WARN("Public key not available"); return; } BT_DBG("Local public key ready"); if (atomic_test_and_clear_bit(bt_mesh_prov_link.flags, WAIT_PUB_KEY)) { prov_dh_key_gen(); } } static void notify_input_complete(void) { if (atomic_test_and_clear_bit(bt_mesh_prov_link.flags, NOTIFY_INPUT_COMPLETE) && bt_mesh_prov->input_complete) { bt_mesh_prov->input_complete(); } } static void send_random(void) { struct os_mbuf *rnd = PROV_BUF(17); bt_mesh_prov_buf_init(rnd, PROV_RANDOM); net_buf_simple_add_mem(rnd, bt_mesh_prov_link.rand, 16); if (bt_mesh_prov_send(rnd, NULL)) { BT_ERR("Failed to send Provisioning Random"); return; } bt_mesh_prov_link.expect = PROV_DATA; } static void prov_random(const uint8_t *data) { uint8_t conf_verify[16]; BT_DBG("Remote Random: %s", bt_hex(data, 16)); if (!memcmp(data, bt_mesh_prov_link.rand, 16)) { BT_ERR("Random value is identical to ours, rejecting."); prov_fail(PROV_ERR_CFM_FAILED); return; } if (bt_mesh_prov_conf(bt_mesh_prov_link.conf_key, data, bt_mesh_prov_link.auth, conf_verify)) { BT_ERR("Unable to calculate confirmation verification"); prov_fail(PROV_ERR_UNEXP_ERR); return; } if (memcmp(conf_verify, bt_mesh_prov_link.conf, 16)) { BT_ERR("Invalid confirmation value"); BT_DBG("Received: %s", bt_hex(bt_mesh_prov_link.conf, 16)); BT_DBG("Calculated: %s", bt_hex(conf_verify, 16)); prov_fail(PROV_ERR_CFM_FAILED); return; } if (bt_mesh_prov_salt(bt_mesh_prov_link.conf_salt, data, bt_mesh_prov_link.rand, bt_mesh_prov_link.prov_salt)) { BT_ERR("Failed to generate provisioning salt"); prov_fail(PROV_ERR_UNEXP_ERR); return; } BT_DBG("ProvisioningSalt: %s", bt_hex(bt_mesh_prov_link.prov_salt, 16)); send_random(); } static void prov_confirm(const uint8_t *data) { BT_DBG("Remote Confirm: %s", bt_hex(data, 16)); memcpy(bt_mesh_prov_link.conf, data, 16); notify_input_complete(); send_confirm(); } static inline bool is_pb_gatt(void) { return bt_mesh_prov_link.bearer && bt_mesh_prov_link.bearer->type == BT_MESH_PROV_GATT; } static void prov_data(const uint8_t *data) { struct os_mbuf *msg = PROV_BUF(1); uint8_t session_key[16]; uint8_t nonce[13]; uint8_t dev_key[16]; uint8_t pdu[25]; uint8_t flags; uint32_t iv_index; uint16_t addr; uint16_t net_idx; int err; bool identity_enable; BT_DBG(""); err = bt_mesh_session_key(bt_mesh_prov_link.dhkey, bt_mesh_prov_link.prov_salt, session_key); if (err) { BT_ERR("Unable to generate session key"); prov_fail(PROV_ERR_UNEXP_ERR); return; } BT_DBG("SessionKey: %s", bt_hex(session_key, 16)); err = bt_mesh_prov_nonce(bt_mesh_prov_link.dhkey, bt_mesh_prov_link.prov_salt, nonce); if (err) { BT_ERR("Unable to generate session nonce"); prov_fail(PROV_ERR_UNEXP_ERR); return; } BT_DBG("Nonce: %s", bt_hex(nonce, 13)); err = bt_mesh_prov_decrypt(session_key, nonce, data, pdu); if (err) { BT_ERR("Unable to decrypt provisioning data"); prov_fail(PROV_ERR_DECRYPT); return; } err = bt_mesh_dev_key(bt_mesh_prov_link.dhkey, bt_mesh_prov_link.prov_salt, dev_key); if (err) { BT_ERR("Unable to generate device key"); prov_fail(PROV_ERR_UNEXP_ERR); return; } BT_DBG("DevKey: %s", bt_hex(dev_key, 16)); net_idx = sys_get_be16(&pdu[16]); flags = pdu[18]; iv_index = sys_get_be32(&pdu[19]); addr = sys_get_be16(&pdu[23]); BT_DBG("net_idx %u iv_index 0x%08x, addr 0x%04x", net_idx, iv_index, addr); bt_mesh_prov_buf_init(msg, PROV_COMPLETE); if (bt_mesh_prov_send(msg, NULL)) { BT_ERR("Failed to send Provisioning Complete"); return; } /* Ignore any further PDUs on this link */ bt_mesh_prov_link.expect = PROV_NO_PDU; /* Store info, since bt_mesh_provision() will end up clearing it */ if (IS_ENABLED(CONFIG_BT_MESH_GATT_PROXY)) { identity_enable = is_pb_gatt(); } else { identity_enable = false; } err = bt_mesh_provision(pdu, net_idx, flags, iv_index, addr, dev_key); if (err) { BT_ERR("Failed to provision (err %d)", err); return; } /* After PB-GATT provisioning we should start advertising * using Node Identity. */ if (IS_ENABLED(CONFIG_BT_MESH_GATT_PROXY) && identity_enable) { bt_mesh_proxy_identity_enable(); } } static void local_input_complete(void) { if (atomic_test_bit(bt_mesh_prov_link.flags, PUB_KEY_SENT)) { send_input_complete(); } else { atomic_set_bit(bt_mesh_prov_link.flags, INPUT_COMPLETE); } } static void prov_link_closed(void) { reset_state(); } static void prov_link_opened(void) { bt_mesh_prov_link.expect = PROV_INVITE; } static const struct bt_mesh_prov_role role_device = { .input_complete = local_input_complete, .link_opened = prov_link_opened, .link_closed = prov_link_closed, .error = prov_fail, .op = { [PROV_INVITE] = prov_invite, [PROV_START] = prov_start, [PROV_PUB_KEY] = prov_pub_key, [PROV_CONFIRM] = prov_confirm, [PROV_RANDOM] = prov_random, [PROV_DATA] = prov_data, }, }; int bt_mesh_prov_enable(bt_mesh_prov_bearer_t bearers) { BT_DBG("bt_mesh_prov_enable"); if (bt_mesh_is_provisioned()) { return -EALREADY; } if (IS_ENABLED(CONFIG_BT_MESH_PB_ADV) && (bearers & BT_MESH_PROV_ADV)) { pb_adv.link_accept(bt_mesh_prov_bearer_cb_get(), NULL); } if (IS_ENABLED(CONFIG_BT_MESH_PB_GATT) && (bearers & BT_MESH_PROV_GATT)) { pb_gatt.link_accept(bt_mesh_prov_bearer_cb_get(), NULL); } BT_DBG("bt_mesh_prov_link.role = &role_device"); bt_mesh_prov_link.role = &role_device; return 0; } int bt_mesh_prov_disable(bt_mesh_prov_bearer_t bearers) { if (bt_mesh_is_provisioned()) { return -EALREADY; } if (IS_ENABLED(CONFIG_BT_MESH_PB_ADV) && (bearers & BT_MESH_PROV_ADV)) { bt_mesh_beacon_disable(); bt_mesh_scan_disable(); } if (IS_ENABLED(CONFIG_BT_MESH_PB_GATT) && (bearers & BT_MESH_PROV_GATT)) { bt_mesh_proxy_prov_disable(true); } return 0; } |