1 // SPDX-License-Identifier: GPL-2.0+
4 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
15 #include <u-boot/sha256.h>
17 DECLARE_GLOBAL_DATA_PTR;
19 #define MAX_DELAY_STOP_STR 32
21 #ifndef DEBUG_BOOTKEYS
22 #define DEBUG_BOOTKEYS 0
24 #define debug_bootkeys(fmt, args...) \
25 debug_cond(DEBUG_BOOTKEYS, fmt, ##args)
27 /* Stored value of bootdelay, used by autoboot_command() */
28 static int stored_bootdelay;
30 #if defined(CONFIG_AUTOBOOT_KEYED)
31 #if defined(CONFIG_AUTOBOOT_STOP_STR_SHA256)
34 * Use a "constant-length" time compare function for this
37 * https://crackstation.net/hashing-security.htm
39 static int slow_equals(u8 *a, u8 *b, int len)
44 for (i = 0; i < len; i++)
50 static int passwd_abort(uint64_t etime)
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;
59 int size = sizeof(sha);
62 if (sha_env_str == NULL)
63 sha_env_str = CONFIG_AUTOBOOT_STOP_STR_SHA256;
66 * Generate the binary value from the environment hash value
67 * so that we can compare this value with the computed hash
70 ret = hash_parse_string(algo_name, sha_env_str, sha_env);
72 printf("Hash %s not supported!\n", algo_name);
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
83 /* Check for input string overflow */
84 if (presskey_len >= MAX_DELAY_STOP_STR)
87 presskey[presskey_len++] = getc();
89 /* Calculate sha256 upon each new char */
90 hash_block(algo_name, (const void *)presskey,
91 presskey_len, sha, &size);
93 /* And check if sha matches saved value in env */
94 if (slow_equals(sha, sha_env, SHA256_SUM_LEN))
97 } while (!abort && get_ticks() <= etime);
102 static int passwd_abort(uint64_t etime)
111 { .str = env_get("bootdelaykey"), .retry = 1 },
112 { .str = env_get("bootstopkey"), .retry = 0 },
115 char presskey[MAX_DELAY_STOP_STR];
116 u_int presskey_len = 0;
117 u_int presskey_max = 0;
120 # ifdef CONFIG_AUTOBOOT_DELAY_STR
121 if (delaykey[0].str == NULL)
122 delaykey[0].str = CONFIG_AUTOBOOT_DELAY_STR;
124 # ifdef CONFIG_AUTOBOOT_STOP_STR
125 if (delaykey[1].str == NULL)
126 delaykey[1].str = CONFIG_AUTOBOOT_STOP_STR;
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;
135 presskey_max = presskey_max > delaykey[i].len ?
136 presskey_max : delaykey[i].len;
138 debug_bootkeys("%s key:<%s>\n",
139 delaykey[i].retry ? "delay" : "stop",
140 delaykey[i].str ? delaykey[i].str : "NULL");
143 /* In order to keep up with incoming data, check timeout only
148 if (presskey_len < presskey_max) {
149 presskey[presskey_len++] = getc();
151 for (i = 0; i < presskey_max - 1; i++)
152 presskey[i] = presskey[i + 1];
154 presskey[i] = getc();
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" :
168 /* don't retry auto boot */
169 if (!delaykey[i].retry)
170 bootretry_dont_retry();
174 } while (!abort && get_ticks() <= etime);
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
184 static int __abortboot(int bootdelay)
187 uint64_t etime = endtick(bootdelay);
189 # ifdef CONFIG_AUTOBOOT_PROMPT
191 * CONFIG_AUTOBOOT_PROMPT includes the %d for all boards.
192 * To print the bootdelay value upon bootup.
194 printf(CONFIG_AUTOBOOT_PROMPT, bootdelay);
197 abort = passwd_abort(etime);
199 debug_bootkeys("key timeout\n");
204 # else /* !defined(CONFIG_AUTOBOOT_KEYED) */
206 #ifdef CONFIG_MENUKEY
210 static int __abortboot(int bootdelay)
215 #ifdef CONFIG_MENUPROMPT
216 printf(CONFIG_MENUPROMPT);
218 printf("Hit any key to stop autoboot: %2d ", bootdelay);
222 * Check if key already pressed
224 if (tstc()) { /* we got a key press */
225 (void) getc(); /* consume input */
227 abort = 1; /* don't auto boot */
230 while ((bootdelay > 0) && (!abort)) {
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
241 (void) getc(); /* consume input */
246 } while (!abort && get_timer(ts) < 1000);
248 printf("\b\b\b%2d ", bootdelay);
255 # endif /* CONFIG_AUTOBOOT_KEYED */
257 static int abortboot(int bootdelay)
262 abort = __abortboot(bootdelay);
264 #ifdef CONFIG_SILENT_CONSOLE
266 gd->flags &= ~GD_FLG_SILENT;
272 static void process_fdt_options(const void *blob)
274 #if defined(CONFIG_OF_CONTROL) && defined(CONFIG_SYS_TEXT_BASE)
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);
280 env_set_addr("kernaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
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);
285 env_set_addr("rootaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
286 #endif /* CONFIG_OF_CONTROL && CONFIG_SYS_TEXT_BASE */
289 const char *bootdelay_process(void)
293 #ifdef CONFIG_BOOTCOUNT_LIMIT
294 unsigned long bootcount = 0;
295 unsigned long bootlimit = 0;
296 #endif /* CONFIG_BOOTCOUNT_LIMIT */
298 #ifdef CONFIG_BOOTCOUNT_LIMIT
299 bootcount = bootcount_load();
301 bootcount_store(bootcount);
302 env_set_ulong("bootcount", bootcount);
303 bootlimit = env_get_ulong("bootlimit", 10, 0);
304 #endif /* CONFIG_BOOTCOUNT_LIMIT */
306 s = env_get("bootdelay");
307 bootdelay = s ? (int)simple_strtol(s, NULL, 10) : CONFIG_BOOTDELAY;
309 #ifdef CONFIG_OF_CONTROL
310 bootdelay = fdtdec_get_config_int(gd->fdt_blob, "bootdelay",
314 debug("### main_loop entered: bootdelay=%d\n\n", bootdelay);
316 #if defined(CONFIG_MENU_SHOW)
317 bootdelay = menu_show(bootdelay);
319 bootretry_init_cmd_timeout();
322 if (gd->flags & GD_FLG_POSTFAIL) {
323 s = env_get("failbootcmd");
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");
332 #endif /* CONFIG_BOOTCOUNT_LIMIT */
333 s = env_get("bootcmd");
335 process_fdt_options(gd->fdt_blob);
336 stored_bootdelay = bootdelay;
341 void autoboot_command(const char *s)
343 debug("### main_loop: bootcmd=\"%s\"\n", s ? s : "<UNDEFINED>");
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 */
350 run_command_list(s, -1, 0);
352 #if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC)
353 disable_ctrlc(prev); /* restore Control C checking */
357 #ifdef CONFIG_MENUKEY
358 if (menukey == CONFIG_MENUKEY) {
359 s = env_get("menucmd");
361 run_command_list(s, -1, 0);
363 #endif /* CONFIG_MENUKEY */