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 #define __BTSTACK_FILE__ "le_device_db_memory.c" 39 40 #include "ble/le_device_db.h" 41 42 #include "ble/core.h" 43 44 #include <stdio.h> 45 #include <string.h> 46 #include "btstack_debug.h" 47 48 // ignore if NVM_LE_DEVICE_DB_ENTRIES is defined 49 #ifndef NVM_NUM_DEVICE_DB_ENTRIES 50 51 // LE Device db implemenation using static memory 52 typedef struct le_device_memory_db { 53 54 // Identification 55 int addr_type; 56 bd_addr_t addr; 57 sm_key_t irk; 58 59 // Stored pairing information allows to re-establish an enncrypted connection 60 // with a peripheral that doesn't have any persistent memory 61 sm_key_t ltk; 62 uint16_t ediv; 63 uint8_t rand[8]; 64 uint8_t key_size; 65 uint8_t authenticated; 66 uint8_t authorized; 67 68 #ifdef ENABLE_LE_SIGNED_WRITE 69 // Signed Writes by remote 70 sm_key_t remote_csrk; 71 uint32_t remote_counter; 72 73 // Signed Writes by us 74 sm_key_t local_csrk; 75 uint32_t local_counter; 76 #endif 77 78 } le_device_memory_db_t; 79 80 #define INVALID_ENTRY_ADDR_TYPE 0xff 81 82 #ifndef MAX_NR_LE_DEVICE_DB_ENTRIES 83 #error "MAX_NR_LE_DEVICE_DB_ENTRIES not defined, please define in btstack_config.h" 84 #endif 85 86 static le_device_memory_db_t le_devices[MAX_NR_LE_DEVICE_DB_ENTRIES]; 87 88 void le_device_db_init(void){ 89 int i; 90 for (i=0;i<MAX_NR_LE_DEVICE_DB_ENTRIES;i++){ 91 le_device_db_remove(i); 92 } 93 } 94 95 void le_device_db_set_local_bd_addr(bd_addr_t bd_addr){ 96 (void)bd_addr; 97 } 98 99 // @returns number of device in db 100 int le_device_db_count(void){ 101 int i; 102 int counter = 0; 103 for (i=0;i<MAX_NR_LE_DEVICE_DB_ENTRIES;i++){ 104 if (le_devices[i].addr_type != INVALID_ENTRY_ADDR_TYPE) counter++; 105 } 106 return counter; 107 } 108 109 // free device 110 void le_device_db_remove(int index){ 111 le_devices[index].addr_type = INVALID_ENTRY_ADDR_TYPE; 112 } 113 114 int le_device_db_add(int addr_type, bd_addr_t addr, sm_key_t irk){ 115 int i; 116 int index = -1; 117 for (i=0;i<MAX_NR_LE_DEVICE_DB_ENTRIES;i++){ 118 if (le_devices[i].addr_type == INVALID_ENTRY_ADDR_TYPE){ 119 index = i; 120 break; 121 } 122 } 123 124 if (index < 0) return -1; 125 126 log_info("LE Device DB adding type %u - %s", addr_type, bd_addr_to_str(addr)); 127 log_info_key("irk", irk); 128 129 le_devices[index].addr_type = addr_type; 130 memcpy(le_devices[index].addr, addr, 6); 131 memcpy(le_devices[index].irk, irk, 16); 132 #ifdef ENABLE_LE_SIGNED_WRITE 133 le_devices[index].remote_counter = 0; 134 #endif 135 return index; 136 } 137 138 139 // get device information: addr type and address 140 void le_device_db_info(int index, int * addr_type, bd_addr_t addr, sm_key_t irk){ 141 if (addr_type) *addr_type = le_devices[index].addr_type; 142 if (addr) memcpy(addr, le_devices[index].addr, 6); 143 if (irk) memcpy(irk, le_devices[index].irk, 16); 144 } 145 146 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){ 147 log_info("LE Device DB set encryption for %u, ediv x%04x, key size %u, authenticated %u, authorized %u", 148 index, ediv, key_size, authenticated, authorized); 149 le_device_memory_db_t * device = &le_devices[index]; 150 device->ediv = ediv; 151 if (rand) memcpy(device->rand, rand, 8); 152 if (ltk) memcpy(device->ltk, ltk, 16); 153 device->key_size = key_size; 154 device->authenticated = authenticated; 155 device->authorized = authorized; 156 } 157 158 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){ 159 le_device_memory_db_t * device = &le_devices[index]; 160 log_info("LE Device DB encryption for %u, ediv x%04x, keysize %u, authenticated %u, authorized %u", 161 index, device->ediv, device->key_size, device->authenticated, device->authorized); 162 if (ediv) *ediv = device->ediv; 163 if (rand) memcpy(rand, device->rand, 8); 164 if (ltk) memcpy(ltk, device->ltk, 16); 165 if (key_size) *key_size = device->key_size; 166 if (authenticated) *authenticated = device->authenticated; 167 if (authorized) *authorized = device->authorized; 168 } 169 170 #ifdef ENABLE_LE_SIGNED_WRITE 171 172 // get signature key 173 void le_device_db_remote_csrk_get(int index, sm_key_t csrk){ 174 if (index < 0 || index >= MAX_NR_LE_DEVICE_DB_ENTRIES){ 175 log_error("le_device_db_remote_csrk_get called with invalid index %d", index); 176 return; 177 } 178 if (csrk) memcpy(csrk, le_devices[index].remote_csrk, 16); 179 } 180 181 void le_device_db_remote_csrk_set(int index, sm_key_t csrk){ 182 if (index < 0 || index >= MAX_NR_LE_DEVICE_DB_ENTRIES){ 183 log_error("le_device_db_remote_csrk_set called with invalid index %d", index); 184 return; 185 } 186 if (csrk) memcpy(le_devices[index].remote_csrk, csrk, 16); 187 } 188 189 void le_device_db_local_csrk_get(int index, sm_key_t csrk){ 190 if (index < 0 || index >= MAX_NR_LE_DEVICE_DB_ENTRIES){ 191 log_error("le_device_db_local_csrk_get called with invalid index %d", index); 192 return; 193 } 194 if (csrk) memcpy(csrk, le_devices[index].local_csrk, 16); 195 } 196 197 void le_device_db_local_csrk_set(int index, sm_key_t csrk){ 198 if (index < 0 || index >= MAX_NR_LE_DEVICE_DB_ENTRIES){ 199 log_error("le_device_db_local_csrk_set called with invalid index %d", index); 200 return; 201 } 202 if (csrk) memcpy(le_devices[index].local_csrk, csrk, 16); 203 } 204 205 // query last used/seen signing counter 206 uint32_t le_device_db_remote_counter_get(int index){ 207 return le_devices[index].remote_counter; 208 } 209 210 // update signing counter 211 void le_device_db_remote_counter_set(int index, uint32_t counter){ 212 le_devices[index].remote_counter = counter; 213 } 214 215 // query last used/seen signing counter 216 uint32_t le_device_db_local_counter_get(int index){ 217 return le_devices[index].local_counter; 218 } 219 220 // update signing counter 221 void le_device_db_local_counter_set(int index, uint32_t counter){ 222 le_devices[index].local_counter = counter; 223 } 224 225 #endif 226 227 void le_device_db_dump(void){ 228 log_info("LE Device DB dump, devices: %d", le_device_db_count()); 229 int i; 230 for (i=0;i<MAX_NR_LE_DEVICE_DB_ENTRIES;i++){ 231 if (le_devices[i].addr_type == INVALID_ENTRY_ADDR_TYPE) continue; 232 log_info("%u: %u %s", i, le_devices[i].addr_type, bd_addr_to_str(le_devices[i].addr)); 233 log_info_key("irk", le_devices[i].irk); 234 #ifdef ENABLE_LE_SIGNED_WRITE 235 log_info_key("local csrk", le_devices[i].local_csrk); 236 log_info_key("remote csrk", le_devices[i].remote_csrk); 237 #endif 238 } 239 } 240 241 #endif 242 243