1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #include "ble/le_device_db.h" 39 40 #include "ble/core.h" 41 42 #include <stdio.h> 43 #include <string.h> 44 #include "btstack_debug.h" 45 46 // Central Device db implemenation using static memory 47 typedef struct le_device_memory_db { 48 49 // Identification 50 int addr_type; 51 bd_addr_t addr; 52 sm_key_t irk; 53 54 // Stored pairing information allows to re-establish an enncrypted connection 55 // with a peripheral that doesn't have any persistent memory 56 sm_key_t ltk; 57 uint16_t ediv; 58 uint8_t rand[8]; 59 uint8_t key_size; 60 uint8_t authenticated; 61 uint8_t authorized; 62 63 // Signed Writes by remote 64 sm_key_t remote_csrk; 65 uint32_t remote_counter; 66 67 // Signed Writes by us 68 sm_key_t local_csrk; 69 uint32_t local_counter; 70 71 } le_device_memory_db_t; 72 73 #define LE_DEVICE_MEMORY_SIZE 4 74 #define INVALID_ENTRY_ADDR_TYPE 0xff 75 76 static le_device_memory_db_t le_devices[LE_DEVICE_MEMORY_SIZE]; 77 78 void le_device_db_init(void){ 79 int i; 80 for (i=0;i<LE_DEVICE_MEMORY_SIZE;i++){ 81 le_device_db_remove(i); 82 } 83 } 84 85 // @returns number of device in db 86 int le_device_db_count(void){ 87 int i; 88 int counter = 0; 89 for (i=0;i<LE_DEVICE_MEMORY_SIZE;i++){ 90 if (le_devices[i].addr_type != INVALID_ENTRY_ADDR_TYPE) counter++; 91 } 92 return counter; 93 } 94 95 // free device 96 void le_device_db_remove(int index){ 97 le_devices[index].addr_type = INVALID_ENTRY_ADDR_TYPE; 98 } 99 100 int le_device_db_add(int addr_type, bd_addr_t addr, sm_key_t irk){ 101 int i; 102 int index = -1; 103 for (i=0;i<LE_DEVICE_MEMORY_SIZE;i++){ 104 if (le_devices[i].addr_type == INVALID_ENTRY_ADDR_TYPE){ 105 index = i; 106 break; 107 } 108 } 109 110 if (index < 0) return -1; 111 112 log_info("Central Device DB adding type %u - %s", addr_type, bd_addr_to_str(addr)); 113 log_info_key("irk", irk); 114 115 le_devices[index].addr_type = addr_type; 116 memcpy(le_devices[index].addr, addr, 6); 117 memcpy(le_devices[index].irk, irk, 16); 118 le_devices[index].remote_counter = 0; 119 120 return index; 121 } 122 123 124 // get device information: addr type and address 125 void le_device_db_info(int index, int * addr_type, bd_addr_t addr, sm_key_t irk){ 126 if (addr_type) *addr_type = le_devices[index].addr_type; 127 if (addr) memcpy(addr, le_devices[index].addr, 6); 128 if (irk) memcpy(irk, le_devices[index].irk, 16); 129 } 130 131 void le_device_db_encryption_set(int index, uint16_t ediv, uint8_t rand[8], sm_key_t ltk, int key_size, int authenticated, int authorized){ 132 log_info("Central Device DB set encryption for %u, ediv x%04x, key size %u, authenticated %u, authorized %u", 133 index, ediv, key_size, authenticated, authorized); 134 le_device_memory_db_t * device = &le_devices[index]; 135 device->ediv = ediv; 136 if (rand) memcpy(device->rand, rand, 8); 137 if (ltk) memcpy(device->ltk, ltk, 16); 138 device->key_size = key_size; 139 device->authenticated = authenticated; 140 device->authorized = authorized; 141 } 142 143 void le_device_db_encryption_get(int index, uint16_t * ediv, uint8_t rand[8], sm_key_t ltk, int * key_size, int * authenticated, int * authorized){ 144 le_device_memory_db_t * device = &le_devices[index]; 145 log_info("Central Device DB encryption for %u, ediv x%04x, keysize %u, authenticated %u, authorized %u", 146 index, device->ediv, device->key_size, device->authenticated, device->authorized); 147 if (ediv) *ediv = device->ediv; 148 if (rand) memcpy(rand, device->rand, 8); 149 if (ltk) memcpy(ltk, device->ltk, 16); 150 if (key_size) *key_size = device->key_size; 151 if (authenticated) *authenticated = device->authenticated; 152 if (authorized) *authorized = device->authorized; 153 } 154 155 // get signature key 156 void le_device_db_remote_csrk_get(int index, sm_key_t csrk){ 157 if (index < 0 || index >= LE_DEVICE_MEMORY_SIZE){ 158 log_error("le_device_db_remote_csrk_get called with invalid index %d", index); 159 return; 160 } 161 if (csrk) memcpy(csrk, le_devices[index].remote_csrk, 16); 162 } 163 164 void le_device_db_remote_csrk_set(int index, sm_key_t csrk){ 165 if (index < 0 || index >= LE_DEVICE_MEMORY_SIZE){ 166 log_error("le_device_db_remote_csrk_set called with invalid index %d", index); 167 return; 168 } 169 if (csrk) memcpy(le_devices[index].remote_csrk, csrk, 16); 170 } 171 172 void le_device_db_local_csrk_get(int index, sm_key_t csrk){ 173 if (index < 0 || index >= LE_DEVICE_MEMORY_SIZE){ 174 log_error("le_device_db_local_csrk_get called with invalid index %d", index); 175 return; 176 } 177 if (csrk) memcpy(csrk, le_devices[index].local_csrk, 16); 178 } 179 180 void le_device_db_local_csrk_set(int index, sm_key_t csrk){ 181 if (index < 0 || index >= LE_DEVICE_MEMORY_SIZE){ 182 log_error("le_device_db_local_csrk_set called with invalid index %d", index); 183 return; 184 } 185 if (csrk) memcpy(le_devices[index].local_csrk, csrk, 16); 186 } 187 188 // query last used/seen signing counter 189 uint32_t le_device_db_remote_counter_get(int index){ 190 return le_devices[index].remote_counter; 191 } 192 193 // update signing counter 194 void le_device_db_remote_counter_set(int index, uint32_t counter){ 195 le_devices[index].remote_counter = counter; 196 } 197 198 // query last used/seen signing counter 199 uint32_t le_device_db_local_counter_get(int index){ 200 return le_devices[index].local_counter; 201 } 202 203 // update signing counter 204 void le_device_db_local_counter_set(int index, uint32_t counter){ 205 le_devices[index].local_counter = counter; 206 } 207 208 void le_device_db_dump(void){ 209 log_info("Central Device DB dump, devices: %d", le_device_db_count()); 210 int i; 211 for (i=0;i<LE_DEVICE_MEMORY_SIZE;i++){ 212 if (le_devices[i].addr_type == INVALID_ENTRY_ADDR_TYPE) continue; 213 log_info("%u: %u %s", i, le_devices[i].addr_type, bd_addr_to_str(le_devices[i].addr)); 214 log_info_key("irk", le_devices[i].irk); 215 log_info_key("local csrk", le_devices[i].local_csrk); 216 log_info_key("remote csrk", le_devices[i].remote_csrk); 217 } 218 } 219