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 void le_device_db_set_local_bd_addr(bd_addr_t bd_addr){ 86 (void)bd_addr; 87 } 88 89 // @returns number of device in db 90 int le_device_db_count(void){ 91 int i; 92 int counter = 0; 93 for (i=0;i<LE_DEVICE_MEMORY_SIZE;i++){ 94 if (le_devices[i].addr_type != INVALID_ENTRY_ADDR_TYPE) counter++; 95 } 96 return counter; 97 } 98 99 // free device 100 void le_device_db_remove(int index){ 101 le_devices[index].addr_type = INVALID_ENTRY_ADDR_TYPE; 102 } 103 104 int le_device_db_add(int addr_type, bd_addr_t addr, sm_key_t irk){ 105 int i; 106 int index = -1; 107 for (i=0;i<LE_DEVICE_MEMORY_SIZE;i++){ 108 if (le_devices[i].addr_type == INVALID_ENTRY_ADDR_TYPE){ 109 index = i; 110 break; 111 } 112 } 113 114 if (index < 0) return -1; 115 116 log_info("Central Device DB adding type %u - %s", addr_type, bd_addr_to_str(addr)); 117 log_info_key("irk", irk); 118 119 le_devices[index].addr_type = addr_type; 120 memcpy(le_devices[index].addr, addr, 6); 121 memcpy(le_devices[index].irk, irk, 16); 122 le_devices[index].remote_counter = 0; 123 124 return index; 125 } 126 127 128 // get device information: addr type and address 129 void le_device_db_info(int index, int * addr_type, bd_addr_t addr, sm_key_t irk){ 130 if (addr_type) *addr_type = le_devices[index].addr_type; 131 if (addr) memcpy(addr, le_devices[index].addr, 6); 132 if (irk) memcpy(irk, le_devices[index].irk, 16); 133 } 134 135 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){ 136 log_info("Central Device DB set encryption for %u, ediv x%04x, key size %u, authenticated %u, authorized %u", 137 index, ediv, key_size, authenticated, authorized); 138 le_device_memory_db_t * device = &le_devices[index]; 139 device->ediv = ediv; 140 if (rand) memcpy(device->rand, rand, 8); 141 if (ltk) memcpy(device->ltk, ltk, 16); 142 device->key_size = key_size; 143 device->authenticated = authenticated; 144 device->authorized = authorized; 145 } 146 147 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){ 148 le_device_memory_db_t * device = &le_devices[index]; 149 log_info("Central Device DB encryption for %u, ediv x%04x, keysize %u, authenticated %u, authorized %u", 150 index, device->ediv, device->key_size, device->authenticated, device->authorized); 151 if (ediv) *ediv = device->ediv; 152 if (rand) memcpy(rand, device->rand, 8); 153 if (ltk) memcpy(ltk, device->ltk, 16); 154 if (key_size) *key_size = device->key_size; 155 if (authenticated) *authenticated = device->authenticated; 156 if (authorized) *authorized = device->authorized; 157 } 158 159 // get signature key 160 void le_device_db_remote_csrk_get(int index, sm_key_t csrk){ 161 if (index < 0 || index >= LE_DEVICE_MEMORY_SIZE){ 162 log_error("le_device_db_remote_csrk_get called with invalid index %d", index); 163 return; 164 } 165 if (csrk) memcpy(csrk, le_devices[index].remote_csrk, 16); 166 } 167 168 void le_device_db_remote_csrk_set(int index, sm_key_t csrk){ 169 if (index < 0 || index >= LE_DEVICE_MEMORY_SIZE){ 170 log_error("le_device_db_remote_csrk_set called with invalid index %d", index); 171 return; 172 } 173 if (csrk) memcpy(le_devices[index].remote_csrk, csrk, 16); 174 } 175 176 void le_device_db_local_csrk_get(int index, sm_key_t csrk){ 177 if (index < 0 || index >= LE_DEVICE_MEMORY_SIZE){ 178 log_error("le_device_db_local_csrk_get called with invalid index %d", index); 179 return; 180 } 181 if (csrk) memcpy(csrk, le_devices[index].local_csrk, 16); 182 } 183 184 void le_device_db_local_csrk_set(int index, sm_key_t csrk){ 185 if (index < 0 || index >= LE_DEVICE_MEMORY_SIZE){ 186 log_error("le_device_db_local_csrk_set called with invalid index %d", index); 187 return; 188 } 189 if (csrk) memcpy(le_devices[index].local_csrk, csrk, 16); 190 } 191 192 // query last used/seen signing counter 193 uint32_t le_device_db_remote_counter_get(int index){ 194 return le_devices[index].remote_counter; 195 } 196 197 // update signing counter 198 void le_device_db_remote_counter_set(int index, uint32_t counter){ 199 le_devices[index].remote_counter = counter; 200 } 201 202 // query last used/seen signing counter 203 uint32_t le_device_db_local_counter_get(int index){ 204 return le_devices[index].local_counter; 205 } 206 207 // update signing counter 208 void le_device_db_local_counter_set(int index, uint32_t counter){ 209 le_devices[index].local_counter = counter; 210 } 211 212 void le_device_db_dump(void){ 213 log_info("Central Device DB dump, devices: %d", le_device_db_count()); 214 int i; 215 for (i=0;i<LE_DEVICE_MEMORY_SIZE;i++){ 216 if (le_devices[i].addr_type == INVALID_ENTRY_ADDR_TYPE) continue; 217 log_info("%u: %u %s", i, le_devices[i].addr_type, bd_addr_to_str(le_devices[i].addr)); 218 log_info_key("irk", le_devices[i].irk); 219 log_info_key("local csrk", le_devices[i].local_csrk); 220 log_info_key("remote csrk", le_devices[i].remote_csrk); 221 } 222 } 223