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Simon Glass66ded172014-04-10 20:01:28 -06001/*
2 * (C) Copyright 2000
3 * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
4 *
5 * SPDX-License-Identifier: GPL-2.0+
6 */
7
8#include <common.h>
Jeroen Hofstee39e12302014-07-13 22:57:58 +02009#include <autoboot.h>
Simon Glass0098e172014-04-10 20:01:30 -060010#include <bootretry.h>
Simon Glass66ded172014-04-10 20:01:28 -060011#include <cli.h>
Simon Glass24b852a2015-11-08 23:47:45 -070012#include <console.h>
Simon Glass66ded172014-04-10 20:01:28 -060013#include <fdtdec.h>
14#include <menu.h>
15#include <post.h>
Stefan Roese8f0b1e22015-05-18 14:08:24 +020016#include <u-boot/sha256.h>
Simon Glass66ded172014-04-10 20:01:28 -060017
18DECLARE_GLOBAL_DATA_PTR;
19
20#define MAX_DELAY_STOP_STR 32
21
22#ifndef DEBUG_BOOTKEYS
23#define DEBUG_BOOTKEYS 0
24#endif
25#define debug_bootkeys(fmt, args...) \
26 debug_cond(DEBUG_BOOTKEYS, fmt, ##args)
27
Simon Glassaffb2152014-04-10 20:01:35 -060028/* Stored value of bootdelay, used by autoboot_command() */
29static int stored_bootdelay;
30
Stefan Roese8f0b1e22015-05-18 14:08:24 +020031#if defined(CONFIG_AUTOBOOT_KEYED)
32#if defined(CONFIG_AUTOBOOT_STOP_STR_SHA256)
33
34/*
35 * Use a "constant-length" time compare function for this
36 * hash compare:
37 *
38 * https://crackstation.net/hashing-security.htm
Simon Glass66ded172014-04-10 20:01:28 -060039 */
Stefan Roese8f0b1e22015-05-18 14:08:24 +020040static int slow_equals(u8 *a, u8 *b, int len)
41{
42 int diff = 0;
43 int i;
44
45 for (i = 0; i < len; i++)
46 diff |= a[i] ^ b[i];
47
48 return diff == 0;
49}
50
51static int passwd_abort(uint64_t etime)
52{
Simon Glass00caae62017-08-03 12:22:12 -060053 const char *sha_env_str = env_get("bootstopkeysha256");
Stefan Roese8f0b1e22015-05-18 14:08:24 +020054 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;
59 int abort = 0;
Martin Etnestad2d06fd82018-01-12 09:04:38 +010060 int size = sizeof(sha);
Stefan Roese8f0b1e22015-05-18 14:08:24 +020061 int ret;
62
63 if (sha_env_str == NULL)
64 sha_env_str = CONFIG_AUTOBOOT_STOP_STR_SHA256;
65
66 /*
67 * Generate the binary value from the environment hash value
68 * so that we can compare this value with the computed hash
69 * from the user input
70 */
71 ret = hash_parse_string(algo_name, sha_env_str, sha_env);
72 if (ret) {
73 printf("Hash %s not supported!\n", algo_name);
74 return 0;
75 }
76
77 /*
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
81 */
82 do {
83 if (tstc()) {
84 /* Check for input string overflow */
85 if (presskey_len >= MAX_DELAY_STOP_STR)
86 return 0;
87
88 presskey[presskey_len++] = getc();
89
90 /* Calculate sha256 upon each new char */
91 hash_block(algo_name, (const void *)presskey,
92 presskey_len, sha, &size);
93
94 /* And check if sha matches saved value in env */
95 if (slow_equals(sha, sha_env, SHA256_SUM_LEN))
96 abort = 1;
97 }
98 } while (!abort && get_ticks() <= etime);
99
100 return abort;
101}
102#else
103static int passwd_abort(uint64_t etime)
Simon Glass66ded172014-04-10 20:01:28 -0600104{
105 int abort = 0;
Simon Glass66ded172014-04-10 20:01:28 -0600106 struct {
107 char *str;
108 u_int len;
109 int retry;
110 }
111 delaykey[] = {
Simon Glass00caae62017-08-03 12:22:12 -0600112 { .str = env_get("bootdelaykey"), .retry = 1 },
113 { .str = env_get("bootstopkey"), .retry = 0 },
Simon Glass66ded172014-04-10 20:01:28 -0600114 };
115
116 char presskey[MAX_DELAY_STOP_STR];
117 u_int presskey_len = 0;
118 u_int presskey_max = 0;
119 u_int i;
120
Simon Glass66ded172014-04-10 20:01:28 -0600121# ifdef CONFIG_AUTOBOOT_DELAY_STR
122 if (delaykey[0].str == NULL)
123 delaykey[0].str = CONFIG_AUTOBOOT_DELAY_STR;
124# endif
Simon Glass66ded172014-04-10 20:01:28 -0600125# ifdef CONFIG_AUTOBOOT_STOP_STR
Stefan Roese2d908fa2015-05-18 14:08:22 +0200126 if (delaykey[1].str == NULL)
127 delaykey[1].str = CONFIG_AUTOBOOT_STOP_STR;
Simon Glass66ded172014-04-10 20:01:28 -0600128# endif
129
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;
135
136 presskey_max = presskey_max > delaykey[i].len ?
137 presskey_max : delaykey[i].len;
138
139 debug_bootkeys("%s key:<%s>\n",
140 delaykey[i].retry ? "delay" : "stop",
141 delaykey[i].str ? delaykey[i].str : "NULL");
142 }
143
144 /* In order to keep up with incoming data, check timeout only
145 * when catch up.
146 */
147 do {
148 if (tstc()) {
149 if (presskey_len < presskey_max) {
150 presskey[presskey_len++] = getc();
151 } else {
152 for (i = 0; i < presskey_max - 1; i++)
153 presskey[i] = presskey[i + 1];
154
155 presskey[i] = getc();
156 }
157 }
158
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" :
167 "stop");
168
Simon Glass66ded172014-04-10 20:01:28 -0600169 /* don't retry auto boot */
170 if (!delaykey[i].retry)
171 bootretry_dont_retry();
Simon Glass66ded172014-04-10 20:01:28 -0600172 abort = 1;
173 }
174 }
175 } while (!abort && get_ticks() <= etime);
176
Stefan Roese8f0b1e22015-05-18 14:08:24 +0200177 return abort;
178}
179#endif
180
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
184 */
Masahiro Yamadad8da8292016-06-27 16:23:02 +0900185static int __abortboot(int bootdelay)
Stefan Roese8f0b1e22015-05-18 14:08:24 +0200186{
187 int abort;
188 uint64_t etime = endtick(bootdelay);
189
Stefan Roese8f0b1e22015-05-18 14:08:24 +0200190# ifdef CONFIG_AUTOBOOT_PROMPT
191 /*
192 * CONFIG_AUTOBOOT_PROMPT includes the %d for all boards.
193 * To print the bootdelay value upon bootup.
194 */
195 printf(CONFIG_AUTOBOOT_PROMPT, bootdelay);
196# endif
197
198 abort = passwd_abort(etime);
Simon Glass66ded172014-04-10 20:01:28 -0600199 if (!abort)
200 debug_bootkeys("key timeout\n");
201
Simon Glass66ded172014-04-10 20:01:28 -0600202 return abort;
203}
204
205# else /* !defined(CONFIG_AUTOBOOT_KEYED) */
206
207#ifdef CONFIG_MENUKEY
208static int menukey;
209#endif
210
Masahiro Yamadad8da8292016-06-27 16:23:02 +0900211static int __abortboot(int bootdelay)
Simon Glass66ded172014-04-10 20:01:28 -0600212{
213 int abort = 0;
214 unsigned long ts;
215
216#ifdef CONFIG_MENUPROMPT
217 printf(CONFIG_MENUPROMPT);
218#else
Masahiro Yamada46327392016-06-27 16:23:04 +0900219 printf("Hit any key to stop autoboot: %2d ", bootdelay);
Simon Glass66ded172014-04-10 20:01:28 -0600220#endif
221
Simon Glass66ded172014-04-10 20:01:28 -0600222 /*
223 * Check if key already pressed
Simon Glass66ded172014-04-10 20:01:28 -0600224 */
Masahiro Yamada46327392016-06-27 16:23:04 +0900225 if (tstc()) { /* we got a key press */
226 (void) getc(); /* consume input */
227 puts("\b\b\b 0");
228 abort = 1; /* don't auto boot */
Simon Glass66ded172014-04-10 20:01:28 -0600229 }
Simon Glass66ded172014-04-10 20:01:28 -0600230
231 while ((bootdelay > 0) && (!abort)) {
232 --bootdelay;
233 /* delay 1000 ms */
234 ts = get_timer(0);
235 do {
236 if (tstc()) { /* we got a key press */
237 abort = 1; /* don't auto boot */
238 bootdelay = 0; /* no more delay */
239# ifdef CONFIG_MENUKEY
240 menukey = getc();
241# else
242 (void) getc(); /* consume input */
243# endif
244 break;
245 }
246 udelay(10000);
247 } while (!abort && get_timer(ts) < 1000);
248
249 printf("\b\b\b%2d ", bootdelay);
250 }
251
252 putc('\n');
253
Simon Glass66ded172014-04-10 20:01:28 -0600254 return abort;
255}
256# endif /* CONFIG_AUTOBOOT_KEYED */
257
258static int abortboot(int bootdelay)
259{
Masahiro Yamada46327392016-06-27 16:23:04 +0900260 int abort = 0;
Masahiro Yamada09b9d9e2016-06-27 16:23:03 +0900261
Masahiro Yamada46327392016-06-27 16:23:04 +0900262 if (bootdelay >= 0)
263 abort = __abortboot(bootdelay);
Masahiro Yamada09b9d9e2016-06-27 16:23:03 +0900264
265#ifdef CONFIG_SILENT_CONSOLE
266 if (abort)
267 gd->flags &= ~GD_FLG_SILENT;
268#endif
269
270 return abort;
Simon Glass66ded172014-04-10 20:01:28 -0600271}
272
Simon Glass66ded172014-04-10 20:01:28 -0600273static void process_fdt_options(const void *blob)
274{
Stefan Roese9f736902016-01-28 17:34:40 +0100275#if defined(CONFIG_OF_CONTROL) && defined(CONFIG_SYS_TEXT_BASE)
Simon Glass66ded172014-04-10 20:01:28 -0600276 ulong addr;
277
278 /* Add an env variable to point to a kernel payload, if available */
279 addr = fdtdec_get_config_int(gd->fdt_blob, "kernel-offset", 0);
280 if (addr)
Simon Glass018f5302017-08-03 12:22:10 -0600281 env_set_addr("kernaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
Simon Glass66ded172014-04-10 20:01:28 -0600282
283 /* Add an env variable to point to a root disk, if available */
284 addr = fdtdec_get_config_int(gd->fdt_blob, "rootdisk-offset", 0);
285 if (addr)
Simon Glass018f5302017-08-03 12:22:10 -0600286 env_set_addr("rootaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
Stefan Roese9f736902016-01-28 17:34:40 +0100287#endif /* CONFIG_OF_CONTROL && CONFIG_SYS_TEXT_BASE */
Simon Glassaffb2152014-04-10 20:01:35 -0600288}
Simon Glass66ded172014-04-10 20:01:28 -0600289
Simon Glassaffb2152014-04-10 20:01:35 -0600290const char *bootdelay_process(void)
Simon Glass66ded172014-04-10 20:01:28 -0600291{
Simon Glass66ded172014-04-10 20:01:28 -0600292 char *s;
293 int bootdelay;
294#ifdef CONFIG_BOOTCOUNT_LIMIT
295 unsigned long bootcount = 0;
296 unsigned long bootlimit = 0;
297#endif /* CONFIG_BOOTCOUNT_LIMIT */
298
299#ifdef CONFIG_BOOTCOUNT_LIMIT
300 bootcount = bootcount_load();
301 bootcount++;
302 bootcount_store(bootcount);
Simon Glass018f5302017-08-03 12:22:10 -0600303 env_set_ulong("bootcount", bootcount);
Simon Glassbfebc8c2017-08-03 12:22:13 -0600304 bootlimit = env_get_ulong("bootlimit", 10, 0);
Simon Glass66ded172014-04-10 20:01:28 -0600305#endif /* CONFIG_BOOTCOUNT_LIMIT */
306
Simon Glass00caae62017-08-03 12:22:12 -0600307 s = env_get("bootdelay");
Simon Glass66ded172014-04-10 20:01:28 -0600308 bootdelay = s ? (int)simple_strtol(s, NULL, 10) : CONFIG_BOOTDELAY;
309
310#ifdef CONFIG_OF_CONTROL
311 bootdelay = fdtdec_get_config_int(gd->fdt_blob, "bootdelay",
312 bootdelay);
313#endif
314
315 debug("### main_loop entered: bootdelay=%d\n\n", bootdelay);
316
317#if defined(CONFIG_MENU_SHOW)
318 bootdelay = menu_show(bootdelay);
319#endif
Simon Glassb26440f2014-04-10 20:01:31 -0600320 bootretry_init_cmd_timeout();
Simon Glass66ded172014-04-10 20:01:28 -0600321
322#ifdef CONFIG_POST
323 if (gd->flags & GD_FLG_POSTFAIL) {
Simon Glass00caae62017-08-03 12:22:12 -0600324 s = env_get("failbootcmd");
Simon Glass66ded172014-04-10 20:01:28 -0600325 } else
326#endif /* CONFIG_POST */
327#ifdef CONFIG_BOOTCOUNT_LIMIT
328 if (bootlimit && (bootcount > bootlimit)) {
329 printf("Warning: Bootlimit (%u) exceeded. Using altbootcmd.\n",
330 (unsigned)bootlimit);
Simon Glass00caae62017-08-03 12:22:12 -0600331 s = env_get("altbootcmd");
Simon Glass66ded172014-04-10 20:01:28 -0600332 } else
333#endif /* CONFIG_BOOTCOUNT_LIMIT */
Simon Glass00caae62017-08-03 12:22:12 -0600334 s = env_get("bootcmd");
Simon Glass66ded172014-04-10 20:01:28 -0600335
336 process_fdt_options(gd->fdt_blob);
Simon Glassaffb2152014-04-10 20:01:35 -0600337 stored_bootdelay = bootdelay;
Simon Glass66ded172014-04-10 20:01:28 -0600338
Simon Glassaffb2152014-04-10 20:01:35 -0600339 return s;
340}
Simon Glass66ded172014-04-10 20:01:28 -0600341
Simon Glassaffb2152014-04-10 20:01:35 -0600342void autoboot_command(const char *s)
343{
Simon Glass66ded172014-04-10 20:01:28 -0600344 debug("### main_loop: bootcmd=\"%s\"\n", s ? s : "<UNDEFINED>");
345
Simon Glassaffb2152014-04-10 20:01:35 -0600346 if (stored_bootdelay != -1 && s && !abortboot(stored_bootdelay)) {
Simon Glass66ded172014-04-10 20:01:28 -0600347#if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC)
348 int prev = disable_ctrlc(1); /* disable Control C checking */
349#endif
350
351 run_command_list(s, -1, 0);
352
353#if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC)
354 disable_ctrlc(prev); /* restore Control C checking */
355#endif
356 }
357
358#ifdef CONFIG_MENUKEY
359 if (menukey == CONFIG_MENUKEY) {
Simon Glass00caae62017-08-03 12:22:12 -0600360 s = env_get("menucmd");
Simon Glass66ded172014-04-10 20:01:28 -0600361 if (s)
362 run_command_list(s, -1, 0);
363 }
364#endif /* CONFIG_MENUKEY */
365}