1 %{ 2 /* 3 * parser.y 4 * 5 * Copyright (c) 2001-2002 Maksim Yevmenkin <m_evmenkin@yahoo.com> 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $Id: parser.y,v 1.5 2003/06/07 21:22:30 max Exp $ 30 * $FreeBSD$ 31 */ 32 33 #include <sys/fcntl.h> 34 #include <sys/queue.h> 35 #include <bluetooth.h> 36 #include <errno.h> 37 #include <limits.h> 38 #include <stdio.h> 39 #include <stdarg.h> 40 #include <string.h> 41 #include <syslog.h> 42 #include <unistd.h> 43 #include "hcsecd.h" 44 45 int yyparse (void); 46 int yylex (void); 47 48 static void free_key (link_key_p key); 49 static int hexa2int4(char *a); 50 static int hexa2int8(char *a); 51 52 extern int yylineno; 53 static LIST_HEAD(, link_key) link_keys; 54 char *config_file = "/etc/bluetooth/hcsecd.conf"; 55 56 static link_key_p key = NULL; 57 %} 58 59 %union { 60 char *string; 61 } 62 63 %token <string> T_BDADDRSTRING T_HEXSTRING T_STRING 64 %token T_DEVICE T_BDADDR T_NAME T_KEY T_PIN T_NOKEY T_NOPIN T_JUNK 65 66 %% 67 68 config: line 69 | config line 70 ; 71 72 line: T_DEVICE 73 { 74 key = (link_key_p) malloc(sizeof(*key)); 75 if (key == NULL) { 76 syslog(LOG_ERR, "Could not allocate new " \ 77 "config entry"); 78 exit(1); 79 } 80 81 memset(key, 0, sizeof(*key)); 82 } 83 '{' options '}' 84 { 85 if (get_key(&key->bdaddr, 1) != NULL) { 86 syslog(LOG_ERR, "Ignoring duplicated entry " \ 87 "for bdaddr %s", 88 bt_ntoa(&key->bdaddr, NULL)); 89 free_key(key); 90 } else 91 LIST_INSERT_HEAD(&link_keys, key, next); 92 93 key = NULL; 94 } 95 ; 96 97 options: option ';' 98 | options option ';' 99 ; 100 101 option: bdaddr 102 | name 103 | key 104 | pin 105 ; 106 107 bdaddr: T_BDADDR T_BDADDRSTRING 108 { 109 if (!bt_aton($2, &key->bdaddr)) { 110 syslog(LOG_ERR, "Cound not parse BD_ADDR " \ 111 "'%s'", $2); 112 exit(1); 113 } 114 } 115 ; 116 117 name: T_NAME T_STRING 118 { 119 if (key->name != NULL) 120 free(key->name); 121 122 key->name = strdup($2); 123 if (key->name == NULL) { 124 syslog(LOG_ERR, "Could not allocate new " \ 125 "device name"); 126 exit(1); 127 } 128 } 129 ; 130 131 key: T_KEY T_HEXSTRING 132 { 133 int i, len; 134 135 if (key->key != NULL) 136 free(key->key); 137 138 key->key = (uint8_t *) malloc(NG_HCI_KEY_SIZE); 139 if (key->key == NULL) { 140 syslog(LOG_ERR, "Could not allocate new " \ 141 "link key"); 142 exit(1); 143 } 144 145 memset(key->key, 0, NG_HCI_KEY_SIZE); 146 147 len = strlen($2) / 2; 148 if (len > NG_HCI_KEY_SIZE) 149 len = NG_HCI_KEY_SIZE; 150 151 for (i = 0; i < len; i ++) 152 key->key[i] = hexa2int8((char *)($2) + 2*i); 153 } 154 | T_KEY T_NOKEY 155 { 156 if (key->key != NULL) 157 free(key->key); 158 159 key->key = NULL; 160 } 161 ; 162 163 pin: T_PIN T_STRING 164 { 165 if (key->pin != NULL) 166 free(key->pin); 167 168 key->pin = strdup($2); 169 if (key->pin == NULL) { 170 syslog(LOG_ERR, "Could not allocate new " \ 171 "PIN code"); 172 exit(1); 173 } 174 } 175 | T_PIN T_NOPIN 176 { 177 if (key->pin != NULL) 178 free(key->pin); 179 180 key->pin = NULL; 181 } 182 ; 183 184 %% 185 186 /* Display parser error message */ 187 void 188 yyerror(char const *message) 189 { 190 syslog(LOG_ERR, "%s in line %d", message, yylineno); 191 } 192 193 /* Re-read config file */ 194 void 195 read_config_file(void) 196 { 197 extern FILE *yyin; 198 199 if (config_file == NULL) { 200 syslog(LOG_ERR, "Unknown config file name!"); 201 exit(1); 202 } 203 204 if ((yyin = fopen(config_file, "r")) == NULL) { 205 syslog(LOG_ERR, "Could not open config file '%s'. %s (%d)", 206 config_file, strerror(errno), errno); 207 exit(1); 208 } 209 210 clean_config(); 211 if (yyparse() < 0) { 212 syslog(LOG_ERR, "Could not parse config file '%s'",config_file); 213 exit(1); 214 } 215 216 fclose(yyin); 217 yyin = NULL; 218 219 #if __config_debug__ 220 dump_config(); 221 #endif 222 } 223 224 /* Clean config */ 225 void 226 clean_config(void) 227 { 228 link_key_p key = NULL; 229 230 while ((key = LIST_FIRST(&link_keys)) != NULL) { 231 LIST_REMOVE(key, next); 232 free_key(key); 233 } 234 } 235 236 /* Find link key entry in the list. Return exact or default match */ 237 link_key_p 238 get_key(bdaddr_p bdaddr, int exact_match) 239 { 240 link_key_p key = NULL, defkey = NULL; 241 242 LIST_FOREACH(key, &link_keys, next) { 243 if (memcmp(bdaddr, &key->bdaddr, sizeof(key->bdaddr)) == 0) 244 break; 245 246 if (!exact_match) 247 if (memcmp(NG_HCI_BDADDR_ANY, &key->bdaddr, 248 sizeof(key->bdaddr)) == 0) 249 defkey = key; 250 } 251 252 return ((key != NULL)? key : defkey); 253 } 254 255 #if __config_debug__ 256 /* Dump config */ 257 void 258 dump_config(void) 259 { 260 link_key_p key = NULL; 261 char buffer[64]; 262 263 LIST_FOREACH(key, &link_keys, next) { 264 if (key->key != NULL) 265 snprintf(buffer, sizeof(buffer), 266 "0x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", 267 key->key[0], key->key[1], key->key[2], 268 key->key[3], key->key[4], key->key[5], 269 key->key[6], key->key[7], key->key[8], 270 key->key[9], key->key[10], key->key[11], 271 key->key[12], key->key[13], key->key[14], 272 key->key[15]); 273 274 syslog(LOG_DEBUG, 275 "device %s " \ 276 "bdaddr %s " \ 277 "pin %s " \ 278 "key %s", 279 (key->name != NULL)? key->name : "noname", 280 bt_ntoa(&key->bdaddr, NULL), 281 (key->pin != NULL)? key->pin : "nopin", 282 (key->key != NULL)? buffer : "nokey"); 283 } 284 } 285 #endif 286 287 /* Read keys file */ 288 int 289 read_keys_file(void) 290 { 291 FILE *f = NULL; 292 link_key_t *key = NULL; 293 char buf[HCSECD_BUFFER_SIZE], *p = NULL, *cp = NULL; 294 bdaddr_t bdaddr; 295 int i, len; 296 297 if ((f = fopen(HCSECD_KEYSFILE, "r")) == NULL) { 298 if (errno == ENOENT) 299 return (0); 300 301 syslog(LOG_ERR, "Could not open keys file %s. %s (%d)\n", 302 HCSECD_KEYSFILE, strerror(errno), errno); 303 304 return (-1); 305 } 306 307 while ((p = fgets(buf, sizeof(buf), f)) != NULL) { 308 if (*p == '#') 309 continue; 310 if ((cp = strpbrk(p, " ")) == NULL) 311 continue; 312 313 *cp++ = '\0'; 314 315 if (!bt_aton(p, &bdaddr)) 316 continue; 317 318 if ((key = get_key(&bdaddr, 1)) == NULL) 319 continue; 320 321 if (key->key == NULL) { 322 key->key = (uint8_t *) malloc(NG_HCI_KEY_SIZE); 323 if (key->key == NULL) { 324 syslog(LOG_ERR, "Could not allocate link key"); 325 exit(1); 326 } 327 } 328 329 memset(key->key, 0, NG_HCI_KEY_SIZE); 330 331 len = strlen(cp) / 2; 332 if (len > NG_HCI_KEY_SIZE) 333 len = NG_HCI_KEY_SIZE; 334 335 for (i = 0; i < len; i ++) 336 key->key[i] = hexa2int8(cp + 2*i); 337 338 syslog(LOG_DEBUG, "Restored link key for the entry, " \ 339 "remote bdaddr %s, name '%s'", 340 bt_ntoa(&key->bdaddr, NULL), 341 (key->name != NULL)? key->name : "No name"); 342 } 343 344 fclose(f); 345 346 return (0); 347 } 348 349 /* Dump keys file */ 350 int 351 dump_keys_file(void) 352 { 353 link_key_p key = NULL; 354 char tmp[PATH_MAX], buf[HCSECD_BUFFER_SIZE]; 355 int f; 356 357 snprintf(tmp, sizeof(tmp), "%s.tmp", HCSECD_KEYSFILE); 358 if ((f = open(tmp, O_RDWR|O_CREAT|O_TRUNC|O_EXCL, 0600)) < 0) { 359 syslog(LOG_ERR, "Could not create temp keys file %s. %s (%d)\n", 360 tmp, strerror(errno), errno); 361 return (-1); 362 } 363 364 LIST_FOREACH(key, &link_keys, next) { 365 if (key->key == NULL) 366 continue; 367 368 snprintf(buf, sizeof(buf), 369 "%s %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n", 370 bt_ntoa(&key->bdaddr, NULL), 371 key->key[0], key->key[1], key->key[2], key->key[3], 372 key->key[4], key->key[5], key->key[6], key->key[7], 373 key->key[8], key->key[9], key->key[10], key->key[11], 374 key->key[12], key->key[13], key->key[14], key->key[15]); 375 376 if (write(f, buf, strlen(buf)) < 0) { 377 syslog(LOG_ERR, "Could not write temp keys file. " \ 378 "%s (%d)\n", strerror(errno), errno); 379 break; 380 } 381 } 382 383 close(f); 384 385 if (rename(tmp, HCSECD_KEYSFILE) < 0) { 386 syslog(LOG_ERR, "Could not rename(%s, %s). %s (%d)\n", 387 tmp, HCSECD_KEYSFILE, strerror(errno), errno); 388 unlink(tmp); 389 return (-1); 390 } 391 392 return (0); 393 } 394 395 /* Free key entry */ 396 static void 397 free_key(link_key_p key) 398 { 399 if (key->name != NULL) 400 free(key->name); 401 if (key->key != NULL) 402 free(key->key); 403 if (key->pin != NULL) 404 free(key->pin); 405 406 memset(key, 0, sizeof(*key)); 407 free(key); 408 } 409 410 /* Convert hex ASCII to int4 */ 411 static int 412 hexa2int4(char *a) 413 { 414 if ('0' <= *a && *a <= '9') 415 return (*a - '0'); 416 417 if ('A' <= *a && *a <= 'F') 418 return (*a - 'A' + 0xa); 419 420 if ('a' <= *a && *a <= 'f') 421 return (*a - 'a' + 0xa); 422 423 syslog(LOG_ERR, "Invalid hex character: '%c' (%#x)", *a, *a); 424 exit(1); 425 } 426 427 /* Convert hex ASCII to int8 */ 428 static int 429 hexa2int8(char *a) 430 { 431 return ((hexa2int4(a) << 4) | hexa2int4(a + 1)); 432 } 433 434