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 */