3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * SPDX-License-Identifier: GPL-2.0+
10 #include <bootretry.h>
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
= getenv("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;
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
= getenv("bootdelaykey"), .retry
= 1 },
112 { .str
= getenv("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_keyed(int bootdelay
)
187 uint64_t etime
= endtick(bootdelay
);
189 #ifndef CONFIG_ZERO_BOOTDELAY_CHECK
194 # ifdef CONFIG_AUTOBOOT_PROMPT
196 * CONFIG_AUTOBOOT_PROMPT includes the %d for all boards.
197 * To print the bootdelay value upon bootup.
199 printf(CONFIG_AUTOBOOT_PROMPT
, bootdelay
);
202 abort
= passwd_abort(etime
);
204 debug_bootkeys("key timeout\n");
206 #ifdef CONFIG_SILENT_CONSOLE
208 gd
->flags
&= ~GD_FLG_SILENT
;
214 # else /* !defined(CONFIG_AUTOBOOT_KEYED) */
216 #ifdef CONFIG_MENUKEY
220 static int abortboot_normal(int bootdelay
)
225 #ifdef CONFIG_MENUPROMPT
226 printf(CONFIG_MENUPROMPT
);
229 printf("Hit any key to stop autoboot: %2d ", bootdelay
);
232 #if defined CONFIG_ZERO_BOOTDELAY_CHECK
234 * Check if key already pressed
235 * Don't check if bootdelay < 0
237 if (bootdelay
>= 0) {
238 if (tstc()) { /* we got a key press */
239 (void) getc(); /* consume input */
241 abort
= 1; /* don't auto boot */
246 while ((bootdelay
> 0) && (!abort
)) {
251 if (tstc()) { /* we got a key press */
252 abort
= 1; /* don't auto boot */
253 bootdelay
= 0; /* no more delay */
254 # ifdef CONFIG_MENUKEY
257 (void) getc(); /* consume input */
262 } while (!abort
&& get_timer(ts
) < 1000);
264 printf("\b\b\b%2d ", bootdelay
);
269 #ifdef CONFIG_SILENT_CONSOLE
271 gd
->flags
&= ~GD_FLG_SILENT
;
276 # endif /* CONFIG_AUTOBOOT_KEYED */
278 static int abortboot(int bootdelay
)
280 #ifdef CONFIG_AUTOBOOT_KEYED
281 return abortboot_keyed(bootdelay
);
283 return abortboot_normal(bootdelay
);
287 static void process_fdt_options(const void *blob
)
289 #if defined(CONFIG_OF_CONTROL)
292 /* Add an env variable to point to a kernel payload, if available */
293 addr
= fdtdec_get_config_int(gd
->fdt_blob
, "kernel-offset", 0);
295 setenv_addr("kernaddr", (void *)(CONFIG_SYS_TEXT_BASE
+ addr
));
297 /* Add an env variable to point to a root disk, if available */
298 addr
= fdtdec_get_config_int(gd
->fdt_blob
, "rootdisk-offset", 0);
300 setenv_addr("rootaddr", (void *)(CONFIG_SYS_TEXT_BASE
+ addr
));
301 #endif /* CONFIG_OF_CONTROL */
304 const char *bootdelay_process(void)
308 #ifdef CONFIG_BOOTCOUNT_LIMIT
309 unsigned long bootcount
= 0;
310 unsigned long bootlimit
= 0;
311 #endif /* CONFIG_BOOTCOUNT_LIMIT */
313 #ifdef CONFIG_BOOTCOUNT_LIMIT
314 bootcount
= bootcount_load();
316 bootcount_store(bootcount
);
317 setenv_ulong("bootcount", bootcount
);
318 bootlimit
= getenv_ulong("bootlimit", 10, 0);
319 #endif /* CONFIG_BOOTCOUNT_LIMIT */
321 s
= getenv("bootdelay");
322 bootdelay
= s
? (int)simple_strtol(s
, NULL
, 10) : CONFIG_BOOTDELAY
;
324 #ifdef CONFIG_OF_CONTROL
325 bootdelay
= fdtdec_get_config_int(gd
->fdt_blob
, "bootdelay",
329 debug("### main_loop entered: bootdelay=%d\n\n", bootdelay
);
331 #if defined(CONFIG_MENU_SHOW)
332 bootdelay
= menu_show(bootdelay
);
334 bootretry_init_cmd_timeout();
337 if (gd
->flags
& GD_FLG_POSTFAIL
) {
338 s
= getenv("failbootcmd");
340 #endif /* CONFIG_POST */
341 #ifdef CONFIG_BOOTCOUNT_LIMIT
342 if (bootlimit
&& (bootcount
> bootlimit
)) {
343 printf("Warning: Bootlimit (%u) exceeded. Using altbootcmd.\n",
344 (unsigned)bootlimit
);
345 s
= getenv("altbootcmd");
347 #endif /* CONFIG_BOOTCOUNT_LIMIT */
348 s
= getenv("bootcmd");
350 process_fdt_options(gd
->fdt_blob
);
351 stored_bootdelay
= bootdelay
;
356 void autoboot_command(const char *s
)
358 debug("### main_loop: bootcmd=\"%s\"\n", s
? s
: "<UNDEFINED>");
360 if (stored_bootdelay
!= -1 && s
&& !abortboot(stored_bootdelay
)) {
361 #if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC)
362 int prev
= disable_ctrlc(1); /* disable Control C checking */
365 run_command_list(s
, -1, 0);
367 #if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC)
368 disable_ctrlc(prev
); /* restore Control C checking */
372 #ifdef CONFIG_MENUKEY
373 if (menukey
== CONFIG_MENUKEY
) {
374 s
= getenv("menucmd");
376 run_command_list(s
, -1, 0);
378 #endif /* CONFIG_MENUKEY */