blob: c367076257971b943e2d0c872fda448602316930 [file] [log] [blame]
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>
12#include <fdtdec.h>
13#include <menu.h>
14#include <post.h>
Stefan Roese8f0b1e22015-05-18 14:08:24 +020015#include <u-boot/sha256.h>
Simon Glass66ded172014-04-10 20:01:28 -060016
17DECLARE_GLOBAL_DATA_PTR;
18
19#define MAX_DELAY_STOP_STR 32
20
21#ifndef DEBUG_BOOTKEYS
22#define DEBUG_BOOTKEYS 0
23#endif
24#define debug_bootkeys(fmt, args...) \
25 debug_cond(DEBUG_BOOTKEYS, fmt, ##args)
26
Simon Glassaffb2152014-04-10 20:01:35 -060027/* Stored value of bootdelay, used by autoboot_command() */
28static int stored_bootdelay;
29
Stefan Roese8f0b1e22015-05-18 14:08:24 +020030#if defined(CONFIG_AUTOBOOT_KEYED)
31#if defined(CONFIG_AUTOBOOT_STOP_STR_SHA256)
32
33/*
34 * Use a "constant-length" time compare function for this
35 * hash compare:
36 *
37 * https://crackstation.net/hashing-security.htm
Simon Glass66ded172014-04-10 20:01:28 -060038 */
Stefan Roese8f0b1e22015-05-18 14:08:24 +020039static int slow_equals(u8 *a, u8 *b, int len)
40{
41 int diff = 0;
42 int i;
43
44 for (i = 0; i < len; i++)
45 diff |= a[i] ^ b[i];
46
47 return diff == 0;
48}
49
50static int passwd_abort(uint64_t etime)
51{
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;
58 int abort = 0;
59 int size;
60 int ret;
61
62 if (sha_env_str == NULL)
63 sha_env_str = CONFIG_AUTOBOOT_STOP_STR_SHA256;
64
65 /*
66 * Generate the binary value from the environment hash value
67 * so that we can compare this value with the computed hash
68 * from the user input
69 */
70 ret = hash_parse_string(algo_name, sha_env_str, sha_env);
71 if (ret) {
72 printf("Hash %s not supported!\n", algo_name);
73 return 0;
74 }
75
76 /*
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
80 */
81 do {
82 if (tstc()) {
83 /* Check for input string overflow */
84 if (presskey_len >= MAX_DELAY_STOP_STR)
85 return 0;
86
87 presskey[presskey_len++] = getc();
88
89 /* Calculate sha256 upon each new char */
90 hash_block(algo_name, (const void *)presskey,
91 presskey_len, sha, &size);
92
93 /* And check if sha matches saved value in env */
94 if (slow_equals(sha, sha_env, SHA256_SUM_LEN))
95 abort = 1;
96 }
97 } while (!abort && get_ticks() <= etime);
98
99 return abort;
100}
101#else
102static int passwd_abort(uint64_t etime)
Simon Glass66ded172014-04-10 20:01:28 -0600103{
104 int abort = 0;
Simon Glass66ded172014-04-10 20:01:28 -0600105 struct {
106 char *str;
107 u_int len;
108 int retry;
109 }
110 delaykey[] = {
Jeroen Hofstee9e546ee2014-06-16 00:17:33 +0200111 { .str = getenv("bootdelaykey"), .retry = 1 },
Jeroen Hofstee9e546ee2014-06-16 00:17:33 +0200112 { .str = getenv("bootstopkey"), .retry = 0 },
Simon Glass66ded172014-04-10 20:01:28 -0600113 };
114
115 char presskey[MAX_DELAY_STOP_STR];
116 u_int presskey_len = 0;
117 u_int presskey_max = 0;
118 u_int i;
119
Simon Glass66ded172014-04-10 20:01:28 -0600120# ifdef CONFIG_AUTOBOOT_DELAY_STR
121 if (delaykey[0].str == NULL)
122 delaykey[0].str = CONFIG_AUTOBOOT_DELAY_STR;
123# endif
Simon Glass66ded172014-04-10 20:01:28 -0600124# ifdef CONFIG_AUTOBOOT_STOP_STR
Stefan Roese2d908fa2015-05-18 14:08:22 +0200125 if (delaykey[1].str == NULL)
126 delaykey[1].str = CONFIG_AUTOBOOT_STOP_STR;
Simon Glass66ded172014-04-10 20:01:28 -0600127# endif
128
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;
134
135 presskey_max = presskey_max > delaykey[i].len ?
136 presskey_max : delaykey[i].len;
137
138 debug_bootkeys("%s key:<%s>\n",
139 delaykey[i].retry ? "delay" : "stop",
140 delaykey[i].str ? delaykey[i].str : "NULL");
141 }
142
143 /* In order to keep up with incoming data, check timeout only
144 * when catch up.
145 */
146 do {
147 if (tstc()) {
148 if (presskey_len < presskey_max) {
149 presskey[presskey_len++] = getc();
150 } else {
151 for (i = 0; i < presskey_max - 1; i++)
152 presskey[i] = presskey[i + 1];
153
154 presskey[i] = getc();
155 }
156 }
157
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" :
166 "stop");
167
Simon Glass66ded172014-04-10 20:01:28 -0600168 /* don't retry auto boot */
169 if (!delaykey[i].retry)
170 bootretry_dont_retry();
Simon Glass66ded172014-04-10 20:01:28 -0600171 abort = 1;
172 }
173 }
174 } while (!abort && get_ticks() <= etime);
175
Stefan Roese8f0b1e22015-05-18 14:08:24 +0200176 return abort;
177}
178#endif
179
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
183 */
184static int abortboot_keyed(int bootdelay)
185{
186 int abort;
187 uint64_t etime = endtick(bootdelay);
188
189#ifndef CONFIG_ZERO_BOOTDELAY_CHECK
190 if (bootdelay == 0)
191 return 0;
192#endif
193
194# ifdef CONFIG_AUTOBOOT_PROMPT
195 /*
196 * CONFIG_AUTOBOOT_PROMPT includes the %d for all boards.
197 * To print the bootdelay value upon bootup.
198 */
199 printf(CONFIG_AUTOBOOT_PROMPT, bootdelay);
200# endif
201
202 abort = passwd_abort(etime);
Simon Glass66ded172014-04-10 20:01:28 -0600203 if (!abort)
204 debug_bootkeys("key timeout\n");
205
206#ifdef CONFIG_SILENT_CONSOLE
207 if (abort)
208 gd->flags &= ~GD_FLG_SILENT;
209#endif
210
211 return abort;
212}
213
214# else /* !defined(CONFIG_AUTOBOOT_KEYED) */
215
216#ifdef CONFIG_MENUKEY
217static int menukey;
218#endif
219
220static int abortboot_normal(int bootdelay)
221{
222 int abort = 0;
223 unsigned long ts;
224
225#ifdef CONFIG_MENUPROMPT
226 printf(CONFIG_MENUPROMPT);
227#else
228 if (bootdelay >= 0)
229 printf("Hit any key to stop autoboot: %2d ", bootdelay);
230#endif
231
232#if defined CONFIG_ZERO_BOOTDELAY_CHECK
233 /*
234 * Check if key already pressed
235 * Don't check if bootdelay < 0
236 */
237 if (bootdelay >= 0) {
238 if (tstc()) { /* we got a key press */
239 (void) getc(); /* consume input */
240 puts("\b\b\b 0");
241 abort = 1; /* don't auto boot */
242 }
243 }
244#endif
245
246 while ((bootdelay > 0) && (!abort)) {
247 --bootdelay;
248 /* delay 1000 ms */
249 ts = get_timer(0);
250 do {
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
255 menukey = getc();
256# else
257 (void) getc(); /* consume input */
258# endif
259 break;
260 }
261 udelay(10000);
262 } while (!abort && get_timer(ts) < 1000);
263
264 printf("\b\b\b%2d ", bootdelay);
265 }
266
267 putc('\n');
268
269#ifdef CONFIG_SILENT_CONSOLE
270 if (abort)
271 gd->flags &= ~GD_FLG_SILENT;
272#endif
273
274 return abort;
275}
276# endif /* CONFIG_AUTOBOOT_KEYED */
277
278static int abortboot(int bootdelay)
279{
280#ifdef CONFIG_AUTOBOOT_KEYED
281 return abortboot_keyed(bootdelay);
282#else
283 return abortboot_normal(bootdelay);
284#endif
285}
286
Simon Glass66ded172014-04-10 20:01:28 -0600287static void process_fdt_options(const void *blob)
288{
Simon Glassaffb2152014-04-10 20:01:35 -0600289#if defined(CONFIG_OF_CONTROL)
Simon Glass66ded172014-04-10 20:01:28 -0600290 ulong addr;
291
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);
294 if (addr)
295 setenv_addr("kernaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
296
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);
299 if (addr)
300 setenv_addr("rootaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
Simon Glass66ded172014-04-10 20:01:28 -0600301#endif /* CONFIG_OF_CONTROL */
Simon Glassaffb2152014-04-10 20:01:35 -0600302}
Simon Glass66ded172014-04-10 20:01:28 -0600303
Simon Glassaffb2152014-04-10 20:01:35 -0600304const char *bootdelay_process(void)
Simon Glass66ded172014-04-10 20:01:28 -0600305{
Simon Glass66ded172014-04-10 20:01:28 -0600306 char *s;
307 int bootdelay;
308#ifdef CONFIG_BOOTCOUNT_LIMIT
309 unsigned long bootcount = 0;
310 unsigned long bootlimit = 0;
311#endif /* CONFIG_BOOTCOUNT_LIMIT */
312
313#ifdef CONFIG_BOOTCOUNT_LIMIT
314 bootcount = bootcount_load();
315 bootcount++;
316 bootcount_store(bootcount);
317 setenv_ulong("bootcount", bootcount);
318 bootlimit = getenv_ulong("bootlimit", 10, 0);
319#endif /* CONFIG_BOOTCOUNT_LIMIT */
320
321 s = getenv("bootdelay");
322 bootdelay = s ? (int)simple_strtol(s, NULL, 10) : CONFIG_BOOTDELAY;
323
324#ifdef CONFIG_OF_CONTROL
325 bootdelay = fdtdec_get_config_int(gd->fdt_blob, "bootdelay",
326 bootdelay);
327#endif
328
329 debug("### main_loop entered: bootdelay=%d\n\n", bootdelay);
330
331#if defined(CONFIG_MENU_SHOW)
332 bootdelay = menu_show(bootdelay);
333#endif
Simon Glassb26440f2014-04-10 20:01:31 -0600334 bootretry_init_cmd_timeout();
Simon Glass66ded172014-04-10 20:01:28 -0600335
336#ifdef CONFIG_POST
337 if (gd->flags & GD_FLG_POSTFAIL) {
338 s = getenv("failbootcmd");
339 } else
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");
346 } else
347#endif /* CONFIG_BOOTCOUNT_LIMIT */
348 s = getenv("bootcmd");
Simon Glass66ded172014-04-10 20:01:28 -0600349
350 process_fdt_options(gd->fdt_blob);
Simon Glassaffb2152014-04-10 20:01:35 -0600351 stored_bootdelay = bootdelay;
Simon Glass66ded172014-04-10 20:01:28 -0600352
Simon Glassaffb2152014-04-10 20:01:35 -0600353 return s;
354}
Simon Glass66ded172014-04-10 20:01:28 -0600355
Simon Glassaffb2152014-04-10 20:01:35 -0600356void autoboot_command(const char *s)
357{
Simon Glass66ded172014-04-10 20:01:28 -0600358 debug("### main_loop: bootcmd=\"%s\"\n", s ? s : "<UNDEFINED>");
359
Simon Glassaffb2152014-04-10 20:01:35 -0600360 if (stored_bootdelay != -1 && s && !abortboot(stored_bootdelay)) {
Simon Glass66ded172014-04-10 20:01:28 -0600361#if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC)
362 int prev = disable_ctrlc(1); /* disable Control C checking */
363#endif
364
365 run_command_list(s, -1, 0);
366
367#if defined(CONFIG_AUTOBOOT_KEYED) && !defined(CONFIG_AUTOBOOT_KEYED_CTRLC)
368 disable_ctrlc(prev); /* restore Control C checking */
369#endif
370 }
371
372#ifdef CONFIG_MENUKEY
373 if (menukey == CONFIG_MENUKEY) {
374 s = getenv("menucmd");
375 if (s)
376 run_command_list(s, -1, 0);
377 }
378#endif /* CONFIG_MENUKEY */
379}