3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
5 * SPDX-License-Identifier: GPL-2.0+
10 #include <bootretry.h>
16 #include <u-boot/sha256.h>
18 DECLARE_GLOBAL_DATA_PTR
;
20 #define MAX_DELAY_STOP_STR 32
22 #ifndef DEBUG_BOOTKEYS
23 #define DEBUG_BOOTKEYS 0
25 #define debug_bootkeys(fmt, args...) \
26 debug_cond(DEBUG_BOOTKEYS, fmt, ##args)
28 /* Stored value of bootdelay, used by autoboot_command() */
29 static int stored_bootdelay
;
31 #if defined(CONFIG_AUTOBOOT_KEYED)
32 #if defined(CONFIG_AUTOBOOT_STOP_STR_SHA256)
35 * Use a "constant-length" time compare function for this
38 * https://crackstation.net/hashing-security.htm
40 static int slow_equals(u8
*a
, u8
*b
, int len
)
45 for (i
= 0; i
< len
; i
++)
51 static int passwd_abort(uint64_t etime
)
53 const char *sha_env_str
= getenv("bootstopkeysha256");
54 u8 sha_env
[SHA256_SUM_LEN
];
55 u8 sha
[SHA256_SUM_LEN
];
56 char presskey
[MAX_DELAY_STOP_STR
];
57 const char *algo_name
= "sha256";
58 u_int presskey_len
= 0;
63 if (sha_env_str
== NULL
)
64 sha_env_str
= CONFIG_AUTOBOOT_STOP_STR_SHA256
;
67 * Generate the binary value from the environment hash value
68 * so that we can compare this value with the computed hash
71 ret
= hash_parse_string(algo_name
, sha_env_str
, sha_env
);
73 printf("Hash %s not supported!\n", algo_name
);
78 * We don't know how long the stop-string is, so we need to
79 * generate the sha256 hash upon each input character and
80 * compare the value with the one saved in the environment
84 /* Check for input string overflow */
85 if (presskey_len
>= MAX_DELAY_STOP_STR
)
88 presskey
[presskey_len
++] = getc();
90 /* Calculate sha256 upon each new char */
91 hash_block(algo_name
, (const void *)presskey
,
92 presskey_len
, sha
, &size
);
94 /* And check if sha matches saved value in env */
95 if (slow_equals(sha
, sha_env
, SHA256_SUM_LEN
))
98 } while (!abort
&& get_ticks() <= etime
);
103 static int passwd_abort(uint64_t etime
)
112 { .str
= getenv("bootdelaykey"), .retry
= 1 },
113 { .str
= getenv("bootstopkey"), .retry
= 0 },
116 char presskey
[MAX_DELAY_STOP_STR
];
117 u_int presskey_len
= 0;
118 u_int presskey_max
= 0;
121 # ifdef CONFIG_AUTOBOOT_DELAY_STR
122 if (delaykey
[0].str
== NULL
)
123 delaykey
[0].str
= CONFIG_AUTOBOOT_DELAY_STR
;
125 # ifdef CONFIG_AUTOBOOT_STOP_STR
126 if (delaykey
[1].str
== NULL
)
127 delaykey
[1].str
= CONFIG_AUTOBOOT_STOP_STR
;
130 for (i
= 0; i
< sizeof(delaykey
) / sizeof(delaykey
[0]); i
++) {
131 delaykey
[i
].len
= delaykey
[i
].str
== NULL
?
132 0 : strlen(delaykey
[i
].str
);
133 delaykey
[i
].len
= delaykey
[i
].len
> MAX_DELAY_STOP_STR
?
134 MAX_DELAY_STOP_STR
: delaykey
[i
].len
;
136 presskey_max
= presskey_max
> delaykey
[i
].len
?
137 presskey_max
: delaykey
[i
].len
;
139 debug_bootkeys("%s key:<%s>\n",
140 delaykey
[i
].retry
? "delay" : "stop",
141 delaykey
[i
].str
? delaykey
[i
].str
: "NULL");
144 /* In order to keep up with incoming data, check timeout only
149 if (presskey_len
< presskey_max
) {
150 presskey
[presskey_len
++] = getc();
152 for (i
= 0; i
< presskey_max
- 1; i
++)
153 presskey
[i
] = presskey
[i
+ 1];
155 presskey
[i
] = getc();
159 for (i
= 0; i
< sizeof(delaykey
) / sizeof(delaykey
[0]); i
++) {
160 if (delaykey
[i
].len
> 0 &&
161 presskey_len
>= delaykey
[i
].len
&&
162 memcmp(presskey
+ presskey_len
-
163 delaykey
[i
].len
, delaykey
[i
].str
,
164 delaykey
[i
].len
) == 0) {
165 debug_bootkeys("got %skey\n",
166 delaykey
[i
].retry
? "delay" :
169 /* don't retry auto boot */
170 if (!delaykey
[i
].retry
)
171 bootretry_dont_retry();
175 } while (!abort
&& get_ticks() <= etime
);
181 /***************************************************************************
182 * Watch for 'delay' seconds for autoboot stop or autoboot delay string.
183 * returns: 0 - no key string, allow autoboot 1 - got key string, abort
185 static int __abortboot(int bootdelay
)
188 uint64_t etime
= endtick(bootdelay
);
193 # ifdef CONFIG_AUTOBOOT_PROMPT
195 * CONFIG_AUTOBOOT_PROMPT includes the %d for all boards.
196 * To print the bootdelay value upon bootup.
198 printf(CONFIG_AUTOBOOT_PROMPT
, bootdelay
);
201 abort
= passwd_abort(etime
);
203 debug_bootkeys("key timeout\n");
205 #ifdef CONFIG_SILENT_CONSOLE
207 gd
->flags
&= ~GD_FLG_SILENT
;
213 # else /* !defined(CONFIG_AUTOBOOT_KEYED) */
215 #ifdef CONFIG_MENUKEY
219 static int __abortboot(int bootdelay
)
224 #ifdef CONFIG_MENUPROMPT
225 printf(CONFIG_MENUPROMPT
);
228 printf("Hit any key to stop autoboot: %2d ", bootdelay
);
232 * Check if key already pressed
233 * Don't check if bootdelay < 0
235 if (bootdelay
>= 0) {
236 if (tstc()) { /* we got a key press */
237 (void) getc(); /* consume input */
239 abort
= 1; /* don't auto boot */
243 while ((bootdelay
> 0) && (!abort
)) {
248 if (tstc()) { /* we got a key press */
249 abort
= 1; /* don't auto boot */
250 bootdelay
= 0; /* no more delay */
251 # ifdef CONFIG_MENUKEY
254 (void) getc(); /* consume input */
259 } while (!abort
&& get_timer(ts
) < 1000);
261 printf("\b\b\b%2d ", bootdelay
);
266 #ifdef CONFIG_SILENT_CONSOLE
268 gd
->flags
&= ~GD_FLG_SILENT
;
273 # endif /* CONFIG_AUTOBOOT_KEYED */
275 static int abortboot(int bootdelay
)
277 return __abortboot(bootdelay
);
280 static void process_fdt_options(const void *blob
)
282 #if defined(CONFIG_OF_CONTROL) && defined(CONFIG_SYS_TEXT_BASE)
285 /* Add an env variable to point to a kernel payload, if available */
286 addr
= fdtdec_get_config_int(gd
->fdt_blob
, "kernel-offset", 0);
288 setenv_addr("kernaddr", (void *)(CONFIG_SYS_TEXT_BASE
+ addr
));
290 /* Add an env variable to point to a root disk, if available */
291 addr
= fdtdec_get_config_int(gd
->fdt_blob
, "rootdisk-offset", 0);
293 setenv_addr("rootaddr", (void *)(CONFIG_SYS_TEXT_BASE
+ addr
));
294 #endif /* CONFIG_OF_CONTROL && CONFIG_SYS_TEXT_BASE */
297 const char *bootdelay_process(void)
301 #ifdef CONFIG_BOOTCOUNT_LIMIT
302 unsigned long bootcount
= 0;
303 unsigned long bootlimit
= 0;
304 #endif /* CONFIG_BOOTCOUNT_LIMIT */
306 #ifdef CONFIG_BOOTCOUNT_LIMIT
307 bootcount
= bootcount_load();
309 bootcount_store(bootcount
);
310 setenv_ulong("bootcount", bootcount
);
311 bootlimit
= getenv_ulong("bootlimit", 10, 0);
312 #endif /* CONFIG_BOOTCOUNT_LIMIT */
314 s
= getenv("bootdelay");
315 bootdelay
= s
? (int)simple_strtol(s
, NULL
, 10) : CONFIG_BOOTDELAY
;
317 #ifdef CONFIG_OF_CONTROL
318 bootdelay
= fdtdec_get_config_int(gd
->fdt_blob
, "bootdelay",
322 debug("### main_loop entered: bootdelay=%d\n\n", bootdelay
);
324 #if defined(CONFIG_MENU_SHOW)
325 bootdelay
= menu_show(bootdelay
);
327 bootretry_init_cmd_timeout();
330 if (gd
->flags
& GD_FLG_POSTFAIL
) {
331 s
= getenv("failbootcmd");
333 #endif /* CONFIG_POST */
334 #ifdef CONFIG_BOOTCOUNT_LIMIT
335 if (bootlimit
&& (bootcount
> bootlimit
)) {
336 printf("Warning: Bootlimit (%u) exceeded. Using altbootcmd.\n",
337 (unsigned)bootlimit
);
338 s
= getenv("altbootcmd");
340 #endif /* CONFIG_BOOTCOUNT_LIMIT */
341 s
= getenv("bootcmd");
343 process_fdt_options(gd
->fdt_blob
);
344 stored_bootdelay
= bootdelay
;
349 void autoboot_command(const char *s
)
351 debug("### main_loop: bootcmd=\"%s\"\n", s
? s
: "<UNDEFINED>");
353 if (stored_bootdelay
!= -1 && s
&& !abortboot(stored_bootdelay
)) {
354 #if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC)
355 int prev
= disable_ctrlc(1); /* disable Control C checking */
358 run_command_list(s
, -1, 0);
360 #if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC)
361 disable_ctrlc(prev
); /* restore Control C checking */
365 #ifdef CONFIG_MENUKEY
366 if (menukey
== CONFIG_MENUKEY
) {
367 s
= getenv("menucmd");
369 run_command_list(s
, -1, 0);
371 #endif /* CONFIG_MENUKEY */