All of lore.kernel.org
 help / color / mirror / Atom feed
* [U-Boot] [PATCH] autoboot.c: Add feature to stop autobooting via SHA256 encrypted password
@ 2015-03-11  8:51 Stefan Roese
  2015-03-11  8:51 ` [U-Boot] [PATCH] bootcount: Add dcache flush to bootcount_store() Stefan Roese
                   ` (3 more replies)
  0 siblings, 4 replies; 29+ messages in thread
From: Stefan Roese @ 2015-03-11  8:51 UTC (permalink / raw)
  To: u-boot

This patch adds the feature to only stop the autobooting, and therefor
boot into the U-Boot prompt, when the input string / password matches
a values that is encypted via a SHA256 hash and saved in the environment.

This feature is enabled by defined these config options:
     CONFIG_AUTOBOOT_KEYED
     CONFIG_AUTOBOOT_STOP_STR_SHA256

Signed-off-by: Stefan Roese <sr@denx.de>
---
 common/autoboot.c | 45 ++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 44 insertions(+), 1 deletion(-)

diff --git a/common/autoboot.c b/common/autoboot.c
index c27cc2c..4635551 100644
--- a/common/autoboot.c
+++ b/common/autoboot.c
@@ -12,6 +12,7 @@
 #include <fdtdec.h>
 #include <menu.h>
 #include <post.h>
+#include <u-boot/sha256.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -35,6 +36,11 @@ static int abortboot_keyed(int bootdelay)
 {
 	int abort = 0;
 	uint64_t etime = endtick(bootdelay);
+#if defined(CONFIG_AUTOBOOT_STOP_STR_SHA256)
+	const char *sha_env_str = getenv("bootstopkeysha256");
+	u8 sha_env[SHA256_SUM_LEN];
+	u8 sha[SHA256_SUM_LEN];
+#else
 	struct {
 		char *str;
 		u_int len;
@@ -46,10 +52,11 @@ static int abortboot_keyed(int bootdelay)
 		{ .str = getenv("bootstopkey"),   .retry = 0 },
 		{ .str = getenv("bootstopkey2"),  .retry = 0 },
 	};
+	u_int presskey_max = 0;
+#endif
 
 	char presskey[MAX_DELAY_STOP_STR];
 	u_int presskey_len = 0;
-	u_int presskey_max = 0;
 	u_int i;
 
 #ifndef CONFIG_ZERO_BOOTDELAY_CHECK
@@ -61,6 +68,41 @@ static int abortboot_keyed(int bootdelay)
 	printf(CONFIG_AUTOBOOT_PROMPT);
 #  endif
 
+#if defined(CONFIG_AUTOBOOT_STOP_STR_SHA256)
+	if (sha_env_str == NULL)
+		sha_env_str = CONFIG_AUTOBOOT_STOP_STR_SHA256;
+
+	/*
+	 * Generate the binary value from the environment hash value
+	 * so that we can compare this value with the computed hash
+	 * from the user input
+	 */
+	for (i = 0; i < SHA256_SUM_LEN; i++) {
+		char chr[3];
+
+		strncpy(chr, &sha_env_str[i * 2], 2);
+		sha_env[i] = simple_strtoul(chr, NULL, 16);
+	}
+
+	/*
+	 * We don't know how long the stop-string is, so we need to
+	 * generate the sha256 hash upon each input character and
+	 * compare the value with the one saved in the environment
+	 */
+	do {
+		if (tstc()) {
+			presskey[presskey_len++] = getc();
+
+			/* Calculate sha256 upon each new char */
+			sha256_csum_wd((unsigned char *)presskey, presskey_len,
+				       sha, CHUNKSZ_SHA256);
+
+			/* And check if sha matches saved value in env */
+			if (memcmp(sha, sha_env, SHA256_SUM_LEN) == 0)
+				abort = 1;
+		}
+	} while (!abort && get_ticks() <= etime);
+#else
 #  ifdef CONFIG_AUTOBOOT_DELAY_STR
 	if (delaykey[0].str == NULL)
 		delaykey[0].str = CONFIG_AUTOBOOT_DELAY_STR;
@@ -124,6 +166,7 @@ static int abortboot_keyed(int bootdelay)
 			}
 		}
 	} while (!abort && get_ticks() <= etime);
+#endif
 
 	if (!abort)
 		debug_bootkeys("key timeout\n");
-- 
2.3.2

^ permalink raw reply related	[flat|nested] 29+ messages in thread
end of thread, other threads:[~2015-05-05 16:35 UTC | newest]

Thread overview: 29+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-03-11  8:51 [U-Boot] [PATCH] autoboot.c: Add feature to stop autobooting via SHA256 encrypted password Stefan Roese
2015-03-11  8:51 ` [U-Boot] [PATCH] bootcount: Add dcache flush to bootcount_store() Stefan Roese
2015-03-11 14:39   ` Tom Rini
2015-03-13 13:48   ` [U-Boot] " Tom Rini
2015-03-13 14:34     ` Tom Rini
2015-03-15 18:30       ` Tom Rini
2015-03-16 15:57         ` York Sun
2015-03-16 17:05           ` Tom Rini
2015-03-16 17:11             ` York Sun
2015-03-16 17:22               ` Tom Rini
2015-03-17  9:00       ` Holger Brunck
2015-03-27 13:18         ` Stefan Roese
2015-03-27 13:42           ` Nitin Garg
2015-03-27 15:07             ` [U-Boot] [RFC] powerpc: add 2 common dcache assembly functions Valentin Longchamp
2015-03-28 18:07               ` Tom Rini
2015-05-05 16:35               ` [U-Boot] [U-Boot, RFC] " York Sun
2015-03-11  8:51 ` [U-Boot] [PATCH] cmd_led: Extend led command to support blinking and more leds Stefan Roese
2015-03-11 14:38   ` Tom Rini
2015-04-23 22:02   ` [U-Boot] " Tom Rini
2015-03-11  8:51 ` [U-Boot] [PATCH] misc: led: Add PCA9551 LED driver Stefan Roese
2015-03-11 14:40   ` Tom Rini
2015-03-11 14:46   ` Fabio Estevam
2015-03-11 14:36 ` [U-Boot] [PATCH] autoboot.c: Add feature to stop autobooting via SHA256 encrypted password Tom Rini
2015-03-12  8:39   ` Stefan Roese
2015-03-13  2:48   ` Simon Glass
2015-03-13  7:15     ` Stefan Roese
2015-03-23 20:28       ` Simon Glass
2015-05-05 15:06         ` Stefan Roese
2015-05-05 15:12           ` Simon Glass

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.