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Add hwid digest field to GBB header

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This adds a field in the GBB header to store the sha256 digest of
the HWID string, and updates gbb_utility so that it stores the
digest when it modifies the HWID. Because this is a new field,
the GBB_MINOR_VER is incremented.

BUG=chromium:415227
BRANCH=ToT
TEST=make runtests, VBOOT2=1 make runtests

Since the GBB is in the RO firmware, there should be no side
effects for existing devices (but even without that, they should
handle a minor version change without complaint).

Change-Id: Icdb2a0b564677b0b65e58df897d2ec5af3964998
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/221360
This commit is contained in:
Bill Richardson
2014-10-02 18:50:33 -07:00
committed by chrome-internal-fetch
parent 8bb3689d42
commit 6df3e33912
12 changed files with 132 additions and 14 deletions
Download Patch File Download Diff File Expand all files Collapse all files

51
futility/misc.c
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@@ -114,6 +114,57 @@ int futil_valid_gbb_header(GoogleBinaryBlockHeader *gbb, uint32_t len,
return 1;
}
/* For GBB v1.2 and later, print the stored digest of the HWID (and whether
* it's correct). Return true if it is correct. */
int print_hwid_digest(GoogleBinaryBlockHeader *gbb,
const char *banner, const char *footer)
{
printf("%s", banner);
/* There isn't one for v1.1 and earlier, so assume it's good. */
if (gbb->minor_version < 2) {
printf("<none>%s", footer);
return 1;
}
uint8_t *buf = (uint8_t *)gbb;
char *hwid_str = (char *)(buf + gbb->hwid_offset);
int is_valid = 0;
uint8_t* digest = DigestBuf(buf + gbb->hwid_offset,
strlen(hwid_str),
SHA256_DIGEST_ALGORITHM);
if (digest) {
int i;
is_valid = 1;
/* print it, comparing as we go */
for (i = 0; i < SHA256_DIGEST_SIZE; i++) {
printf("%02x", gbb->hwid_digest[i]);
if (gbb->hwid_digest[i] != digest[i])
is_valid = 0;
}
free(digest);
}
printf(" %s", is_valid ? "valid" : "<invalid>");
printf("%s", footer);
return is_valid;
}
/* For GBB v1.2 and later, update the hwid_digest field. */
void update_hwid_digest(GoogleBinaryBlockHeader *gbb)
{
/* There isn't one for v1.1 and earlier */
if (gbb->minor_version < 2)
return;
uint8_t *buf = (uint8_t *)gbb;
char *hwid_str = (char *)(buf + gbb->hwid_offset);
uint8_t* digest = DigestBuf(buf + gbb->hwid_offset,
strlen(hwid_str),
SHA256_DIGEST_ALGORITHM);
memcpy(gbb->hwid_digest, digest, SHA256_DIGEST_SIZE);
free(digest);
}
/*
* TODO: All sorts of race conditions likely here, and everywhere this is used.