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 <string.h> 45 #include "btstack_debug.h" 46 47 // ignore if NVM_LE_DEVICE_DB_ENTRIES is defined 48 #ifndef NVM_NUM_DEVICE_DB_ENTRIES 49 50 // LE Device db implemenation using static memory 51 typedef struct le_device_memory_db { 52 53 // Identification 54 int addr_type; 55 bd_addr_t addr; 56 sm_key_t irk; 57 58 // Stored pairing information allows to re-establish an enncrypted connection 59 // with a peripheral that doesn't have any persistent memory 60 sm_key_t ltk; 61 uint16_t ediv; 62 uint8_t rand[8]; 63 uint8_t key_size; 64 uint8_t authenticated; 65 uint8_t authorized; 66 67 #ifdef ENABLE_LE_SIGNED_WRITE 68 // Signed Writes by remote 69 sm_key_t remote_csrk; 70 uint32_t remote_counter; 71 72 // Signed Writes by us 73 sm_key_t local_csrk; 74 uint32_t local_counter; 75 #endif 76 77 } le_device_memory_db_t; 78 79 #define INVALID_ENTRY_ADDR_TYPE 0xff 80 81 #ifndef MAX_NR_LE_DEVICE_DB_ENTRIES 82 #error "MAX_NR_LE_DEVICE_DB_ENTRIES not defined, please define in btstack_config.h" 83 #endif 84 85 static le_device_memory_db_t le_devices[MAX_NR_LE_DEVICE_DB_ENTRIES]; 86 87 void le_device_db_init(void){ 88 int i; 89 for (i=0;i<MAX_NR_LE_DEVICE_DB_ENTRIES;i++){ 90 le_device_db_remove(i); 91 } 92 } 93 94 void le_device_db_set_local_bd_addr(bd_addr_t bd_addr){ 95 (void)bd_addr; 96 } 97 98 // @returns number of device in db 99 int le_device_db_count(void){ 100 int i; 101 int counter = 0; 102 for (i=0;i<MAX_NR_LE_DEVICE_DB_ENTRIES;i++){ 103 if (le_devices[i].addr_type != INVALID_ENTRY_ADDR_TYPE) counter++; 104 } 105 return counter; 106 } 107 108 int le_device_db_max_count(void){ 109 return MAX_NR_LE_DEVICE_DB_ENTRIES; 110 } 111 112 // free device 113 void le_device_db_remove(int index){ 114 le_devices[index].addr_type = INVALID_ENTRY_ADDR_TYPE; 115 } 116 117 int le_device_db_add(int addr_type, bd_addr_t addr, sm_key_t irk){ 118 int i; 119 int index = -1; 120 for (i=0;i<MAX_NR_LE_DEVICE_DB_ENTRIES;i++){ 121 if (le_devices[i].addr_type == INVALID_ENTRY_ADDR_TYPE){ 122 index = i; 123 break; 124 } 125 } 126 127 if (index < 0) return -1; 128 129 log_info("LE Device DB adding type %u - %s", addr_type, bd_addr_to_str(addr)); 130 log_info_key("irk", irk); 131 132 le_devices[index].addr_type = addr_type; 133 memcpy(le_devices[index].addr, addr, 6); 134 memcpy(le_devices[index].irk, irk, 16); 135 #ifdef ENABLE_LE_SIGNED_WRITE 136 le_devices[index].remote_counter = 0; 137 #endif 138 return index; 139 } 140 141 142 // get device information: addr type and address 143 void le_device_db_info(int index, int * addr_type, bd_addr_t addr, sm_key_t irk){ 144 if (addr_type) *addr_type = le_devices[index].addr_type; 145 if (addr) memcpy(addr, le_devices[index].addr, 6); 146 if (irk) memcpy(irk, le_devices[index].irk, 16); 147 } 148 149 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){ 150 log_info("LE Device DB set encryption for %u, ediv x%04x, key size %u, authenticated %u, authorized %u", 151 index, ediv, key_size, authenticated, authorized); 152 le_device_memory_db_t * device = &le_devices[index]; 153 device->ediv = ediv; 154 if (rand) memcpy(device->rand, rand, 8); 155 if (ltk) memcpy(device->ltk, ltk, 16); 156 device->key_size = key_size; 157 device->authenticated = authenticated; 158 device->authorized = authorized; 159 } 160 161 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){ 162 le_device_memory_db_t * device = &le_devices[index]; 163 log_info("LE Device DB encryption for %u, ediv x%04x, keysize %u, authenticated %u, authorized %u", 164 index, device->ediv, device->key_size, device->authenticated, device->authorized); 165 if (ediv) *ediv = device->ediv; 166 if (rand) memcpy(rand, device->rand, 8); 167 if (ltk) memcpy(ltk, device->ltk, 16); 168 if (key_size) *key_size = device->key_size; 169 if (authenticated) *authenticated = device->authenticated; 170 if (authorized) *authorized = device->authorized; 171 } 172 173 #ifdef ENABLE_LE_SIGNED_WRITE 174 175 // get signature key 176 void le_device_db_remote_csrk_get(int index, sm_key_t csrk){ 177 if (index < 0 || index >= MAX_NR_LE_DEVICE_DB_ENTRIES){ 178 log_error("le_device_db_remote_csrk_get called with invalid index %d", index); 179 return; 180 } 181 if (csrk) memcpy(csrk, le_devices[index].remote_csrk, 16); 182 } 183 184 void le_device_db_remote_csrk_set(int index, sm_key_t csrk){ 185 if (index < 0 || index >= MAX_NR_LE_DEVICE_DB_ENTRIES){ 186 log_error("le_device_db_remote_csrk_set called with invalid index %d", index); 187 return; 188 } 189 if (csrk) memcpy(le_devices[index].remote_csrk, csrk, 16); 190 } 191 192 void le_device_db_local_csrk_get(int index, sm_key_t csrk){ 193 if (index < 0 || index >= MAX_NR_LE_DEVICE_DB_ENTRIES){ 194 log_error("le_device_db_local_csrk_get called with invalid index %d", index); 195 return; 196 } 197 if (csrk) memcpy(csrk, le_devices[index].local_csrk, 16); 198 } 199 200 void le_device_db_local_csrk_set(int index, sm_key_t csrk){ 201 if (index < 0 || index >= MAX_NR_LE_DEVICE_DB_ENTRIES){ 202 log_error("le_device_db_local_csrk_set called with invalid index %d", index); 203 return; 204 } 205 if (csrk) memcpy(le_devices[index].local_csrk, csrk, 16); 206 } 207 208 // query last used/seen signing counter 209 uint32_t le_device_db_remote_counter_get(int index){ 210 return le_devices[index].remote_counter; 211 } 212 213 // update signing counter 214 void le_device_db_remote_counter_set(int index, uint32_t counter){ 215 le_devices[index].remote_counter = counter; 216 } 217 218 // query last used/seen signing counter 219 uint32_t le_device_db_local_counter_get(int index){ 220 return le_devices[index].local_counter; 221 } 222 223 // update signing counter 224 void le_device_db_local_counter_set(int index, uint32_t counter){ 225 le_devices[index].local_counter = counter; 226 } 227 228 #endif 229 230 void le_device_db_dump(void){ 231 log_info("LE Device DB dump, devices: %d", le_device_db_count()); 232 int i; 233 for (i=0;i<MAX_NR_LE_DEVICE_DB_ENTRIES;i++){ 234 if (le_devices[i].addr_type == INVALID_ENTRY_ADDR_TYPE) continue; 235 log_info("%u: %u %s", i, le_devices[i].addr_type, bd_addr_to_str(le_devices[i].addr)); 236 log_info_key("irk", le_devices[i].irk); 237 #ifdef ENABLE_LE_SIGNED_WRITE 238 log_info_key("local csrk", le_devices[i].local_csrk); 239 log_info_key("remote csrk", le_devices[i].remote_csrk); 240 #endif 241 } 242 } 243 244 #endif 245 246