1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * (C) Copyright 2000 4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. 5 */ 6 7 #include <common.h> 8 #include <autoboot.h> 9 #include <bootretry.h> 10 #include <cli.h> 11 #include <console.h> 12 #include <fdtdec.h> 13 #include <menu.h> 14 #include <post.h> 15 #include <u-boot/sha256.h> 16 17 DECLARE_GLOBAL_DATA_PTR; 18 19 #define MAX_DELAY_STOP_STR 32 20 21 #ifndef DEBUG_BOOTKEYS 22 #define DEBUG_BOOTKEYS 0 23 #endif 24 #define debug_bootkeys(fmt, args...) \ 25 debug_cond(DEBUG_BOOTKEYS, fmt, ##args) 26 27 /* Stored value of bootdelay, used by autoboot_command() */ 28 static int stored_bootdelay; 29 30 #if defined(CONFIG_AUTOBOOT_KEYED) 31 #if defined(CONFIG_AUTOBOOT_STOP_STR_SHA256) 32 33 /* 34 * Use a "constant-length" time compare function for this 35 * hash compare: 36 * 37 * https://crackstation.net/hashing-security.htm 38 */ 39 static int slow_equals(u8 *a, u8 *b, int len) 40 { 41 int diff = 0; 42 int i; 43 44 for (i = 0; i < len; i++) 45 diff |= a[i] ^ b[i]; 46 47 return diff == 0; 48 } 49 50 static int passwd_abort(uint64_t etime) 51 { 52 const char *sha_env_str = env_get("bootstopkeysha256"); 53 u8 sha_env[SHA256_SUM_LEN]; 54 u8 sha[SHA256_SUM_LEN]; 55 char presskey[MAX_DELAY_STOP_STR]; 56 const char *algo_name = "sha256"; 57 u_int presskey_len = 0; 58 int abort = 0; 59 int size = sizeof(sha); 60 int ret; 61 62 if (sha_env_str == NULL) 63 sha_env_str = CONFIG_AUTOBOOT_STOP_STR_SHA256; 64 65 /* 66 * Generate the binary value from the environment hash value 67 * so that we can compare this value with the computed hash 68 * from the user input 69 */ 70 ret = hash_parse_string(algo_name, sha_env_str, sha_env); 71 if (ret) { 72 printf("Hash %s not supported!\n", algo_name); 73 return 0; 74 } 75 76 /* 77 * We don't know how long the stop-string is, so we need to 78 * generate the sha256 hash upon each input character and 79 * compare the value with the one saved in the environment 80 */ 81 do { 82 if (tstc()) { 83 /* Check for input string overflow */ 84 if (presskey_len >= MAX_DELAY_STOP_STR) 85 return 0; 86 87 presskey[presskey_len++] = getc(); 88 89 /* Calculate sha256 upon each new char */ 90 hash_block(algo_name, (const void *)presskey, 91 presskey_len, sha, &size); 92 93 /* And check if sha matches saved value in env */ 94 if (slow_equals(sha, sha_env, SHA256_SUM_LEN)) 95 abort = 1; 96 } 97 } while (!abort && get_ticks() <= etime); 98 99 return abort; 100 } 101 #else 102 static int passwd_abort(uint64_t etime) 103 { 104 int abort = 0; 105 struct { 106 char *str; 107 u_int len; 108 int retry; 109 } 110 delaykey[] = { 111 { .str = env_get("bootdelaykey"), .retry = 1 }, 112 { .str = env_get("bootstopkey"), .retry = 0 }, 113 }; 114 115 char presskey[MAX_DELAY_STOP_STR]; 116 u_int presskey_len = 0; 117 u_int presskey_max = 0; 118 u_int i; 119 120 # ifdef CONFIG_AUTOBOOT_DELAY_STR 121 if (delaykey[0].str == NULL) 122 delaykey[0].str = CONFIG_AUTOBOOT_DELAY_STR; 123 # endif 124 # ifdef CONFIG_AUTOBOOT_STOP_STR 125 if (delaykey[1].str == NULL) 126 delaykey[1].str = CONFIG_AUTOBOOT_STOP_STR; 127 # endif 128 129 for (i = 0; i < sizeof(delaykey) / sizeof(delaykey[0]); i++) { 130 delaykey[i].len = delaykey[i].str == NULL ? 131 0 : strlen(delaykey[i].str); 132 delaykey[i].len = delaykey[i].len > MAX_DELAY_STOP_STR ? 133 MAX_DELAY_STOP_STR : delaykey[i].len; 134 135 presskey_max = presskey_max > delaykey[i].len ? 136 presskey_max : delaykey[i].len; 137 138 debug_bootkeys("%s key:<%s>\n", 139 delaykey[i].retry ? "delay" : "stop", 140 delaykey[i].str ? delaykey[i].str : "NULL"); 141 } 142 143 /* In order to keep up with incoming data, check timeout only 144 * when catch up. 145 */ 146 do { 147 if (tstc()) { 148 if (presskey_len < presskey_max) { 149 presskey[presskey_len++] = getc(); 150 } else { 151 for (i = 0; i < presskey_max - 1; i++) 152 presskey[i] = presskey[i + 1]; 153 154 presskey[i] = getc(); 155 } 156 } 157 158 for (i = 0; i < sizeof(delaykey) / sizeof(delaykey[0]); i++) { 159 if (delaykey[i].len > 0 && 160 presskey_len >= delaykey[i].len && 161 memcmp(presskey + presskey_len - 162 delaykey[i].len, delaykey[i].str, 163 delaykey[i].len) == 0) { 164 debug_bootkeys("got %skey\n", 165 delaykey[i].retry ? "delay" : 166 "stop"); 167 168 /* don't retry auto boot */ 169 if (!delaykey[i].retry) 170 bootretry_dont_retry(); 171 abort = 1; 172 } 173 } 174 } while (!abort && get_ticks() <= etime); 175 176 return abort; 177 } 178 #endif 179 180 /*************************************************************************** 181 * Watch for 'delay' seconds for autoboot stop or autoboot delay string. 182 * returns: 0 - no key string, allow autoboot 1 - got key string, abort 183 */ 184 static int __abortboot(int bootdelay) 185 { 186 int abort; 187 uint64_t etime = endtick(bootdelay); 188 189 # ifdef CONFIG_AUTOBOOT_PROMPT 190 /* 191 * CONFIG_AUTOBOOT_PROMPT includes the %d for all boards. 192 * To print the bootdelay value upon bootup. 193 */ 194 printf(CONFIG_AUTOBOOT_PROMPT, bootdelay); 195 # endif 196 197 abort = passwd_abort(etime); 198 if (!abort) 199 debug_bootkeys("key timeout\n"); 200 201 return abort; 202 } 203 204 # else /* !defined(CONFIG_AUTOBOOT_KEYED) */ 205 206 #ifdef CONFIG_MENUKEY 207 static int menukey; 208 #endif 209 210 static int __abortboot(int bootdelay) 211 { 212 int abort = 0; 213 unsigned long ts; 214 215 #ifdef CONFIG_MENUPROMPT 216 printf(CONFIG_MENUPROMPT); 217 #else 218 printf("Hit any key to stop autoboot: %2d ", bootdelay); 219 #endif 220 221 /* 222 * Check if key already pressed 223 */ 224 if (tstc()) { /* we got a key press */ 225 (void) getc(); /* consume input */ 226 puts("\b\b\b 0"); 227 abort = 1; /* don't auto boot */ 228 } 229 230 while ((bootdelay > 0) && (!abort)) { 231 --bootdelay; 232 /* delay 1000 ms */ 233 ts = get_timer(0); 234 do { 235 if (tstc()) { /* we got a key press */ 236 abort = 1; /* don't auto boot */ 237 bootdelay = 0; /* no more delay */ 238 # ifdef CONFIG_MENUKEY 239 menukey = getc(); 240 # else 241 (void) getc(); /* consume input */ 242 # endif 243 break; 244 } 245 udelay(10000); 246 } while (!abort && get_timer(ts) < 1000); 247 248 printf("\b\b\b%2d ", bootdelay); 249 } 250 251 putc('\n'); 252 253 return abort; 254 } 255 # endif /* CONFIG_AUTOBOOT_KEYED */ 256 257 static int abortboot(int bootdelay) 258 { 259 int abort = 0; 260 261 if (bootdelay >= 0) 262 abort = __abortboot(bootdelay); 263 264 #ifdef CONFIG_SILENT_CONSOLE 265 if (abort) 266 gd->flags &= ~GD_FLG_SILENT; 267 #endif 268 269 return abort; 270 } 271 272 static void process_fdt_options(const void *blob) 273 { 274 #if defined(CONFIG_OF_CONTROL) && defined(CONFIG_SYS_TEXT_BASE) 275 ulong addr; 276 277 /* Add an env variable to point to a kernel payload, if available */ 278 addr = fdtdec_get_config_int(gd->fdt_blob, "kernel-offset", 0); 279 if (addr) 280 env_set_addr("kernaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr)); 281 282 /* Add an env variable to point to a root disk, if available */ 283 addr = fdtdec_get_config_int(gd->fdt_blob, "rootdisk-offset", 0); 284 if (addr) 285 env_set_addr("rootaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr)); 286 #endif /* CONFIG_OF_CONTROL && CONFIG_SYS_TEXT_BASE */ 287 } 288 289 const char *bootdelay_process(void) 290 { 291 char *s; 292 int bootdelay; 293 #ifdef CONFIG_BOOTCOUNT_LIMIT 294 unsigned long bootcount = 0; 295 unsigned long bootlimit = 0; 296 #endif /* CONFIG_BOOTCOUNT_LIMIT */ 297 298 #ifdef CONFIG_BOOTCOUNT_LIMIT 299 bootcount = bootcount_load(); 300 bootcount++; 301 bootcount_store(bootcount); 302 env_set_ulong("bootcount", bootcount); 303 bootlimit = env_get_ulong("bootlimit", 10, 0); 304 #endif /* CONFIG_BOOTCOUNT_LIMIT */ 305 306 s = env_get("bootdelay"); 307 bootdelay = s ? (int)simple_strtol(s, NULL, 10) : CONFIG_BOOTDELAY; 308 309 #ifdef CONFIG_OF_CONTROL 310 bootdelay = fdtdec_get_config_int(gd->fdt_blob, "bootdelay", 311 bootdelay); 312 #endif 313 314 debug("### main_loop entered: bootdelay=%d\n\n", bootdelay); 315 316 #if defined(CONFIG_MENU_SHOW) 317 bootdelay = menu_show(bootdelay); 318 #endif 319 bootretry_init_cmd_timeout(); 320 321 #ifdef CONFIG_POST 322 if (gd->flags & GD_FLG_POSTFAIL) { 323 s = env_get("failbootcmd"); 324 } else 325 #endif /* CONFIG_POST */ 326 #ifdef CONFIG_BOOTCOUNT_LIMIT 327 if (bootlimit && (bootcount > bootlimit)) { 328 printf("Warning: Bootlimit (%u) exceeded. Using altbootcmd.\n", 329 (unsigned)bootlimit); 330 s = env_get("altbootcmd"); 331 } else 332 #endif /* CONFIG_BOOTCOUNT_LIMIT */ 333 s = env_get("bootcmd"); 334 335 process_fdt_options(gd->fdt_blob); 336 stored_bootdelay = bootdelay; 337 338 return s; 339 } 340 341 void autoboot_command(const char *s) 342 { 343 debug("### main_loop: bootcmd=\"%s\"\n", s ? s : "<UNDEFINED>"); 344 345 if (stored_bootdelay != -1 && s && !abortboot(stored_bootdelay)) { 346 #if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC) 347 int prev = disable_ctrlc(1); /* disable Control C checking */ 348 #endif 349 350 run_command_list(s, -1, 0); 351 352 #if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC) 353 disable_ctrlc(prev); /* restore Control C checking */ 354 #endif 355 } 356 357 #ifdef CONFIG_MENUKEY 358 if (menukey == CONFIG_MENUKEY) { 359 s = env_get("menucmd"); 360 if (s) 361 run_command_list(s, -1, 0); 362 } 363 #endif /* CONFIG_MENUKEY */ 364 } 365