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SPL: Add signature verification when loading image

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U-boot proper signature is not verified by SPL on most platforms
even config SPL_FIT_SIGNATURE is enabled. Only fsl-layerscape
platform support secure boot in platform specific code. So
verified boot cannot be achieved if u-boot proper is loaded by
SPL.

This patch add signature verification to u-boot proper images
when loading FIT image in SPL. It is tested on Allwinner bananapi
zero board with H2+ SoC.

Signed-off-by: Jun Nie <jun.nie@linaro.org>
This commit is contained in:
Jun Nie 2018-02-27 16:55:58 +08:00 committed by Tom Rini
parent 50905b55c7
commit 5c643db4cc
3 changed files with 48 additions and 22 deletions
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56
common/image-fit.c
View File

@ -1068,34 +1068,14 @@ static int fit_image_check_hash(const void *fit, int noffset, const void *data,
return 0;
}
/**
* fit_image_verify - verify data integrity
* @fit: pointer to the FIT format image header
* @image_noffset: component image node offset
*
* fit_image_verify() goes over component image hash nodes,
* re-calculates each data hash and compares with the value stored in hash
* node.
*
* returns:
* 1, if all hashes are valid
* 0, otherwise (or on error)
*/
int fit_image_verify(const void *fit, int image_noffset)
int fit_image_verify_with_data(const void *fit, int image_noffset,
const void *data, size_t size)
{
const void *data;
size_t size;
int noffset = 0;
char *err_msg = "";
int verify_all = 1;
int ret;
/* Get image data and data length */
if (fit_image_get_data(fit, image_noffset, &data, &size)) {
err_msg = "Can't get image data/size";
goto error;
}
/* Verify all required signatures */
if (IMAGE_ENABLE_VERIFY &&
fit_image_verify_required_sigs(fit, image_noffset, data, size,
@ -1152,6 +1132,38 @@ error:
return 0;
}
/**
* fit_image_verify - verify data integrity
* @fit: pointer to the FIT format image header
* @image_noffset: component image node offset
*
* fit_image_verify() goes over component image hash nodes,
* re-calculates each data hash and compares with the value stored in hash
* node.
*
* returns:
* 1, if all hashes are valid
* 0, otherwise (or on error)
*/
int fit_image_verify(const void *fit, int image_noffset)
{
const void *data;
size_t size;
int noffset = 0;
char *err_msg = "";
/* Get image data and data length */
if (fit_image_get_data(fit, image_noffset, &data, &size)) {
err_msg = "Can't get image data/size";
printf("error!\n%s for '%s' hash node in '%s' image node\n",
err_msg, fit_get_name(fit, noffset, NULL),
fit_get_name(fit, image_noffset, NULL));
return 0;
}
return fit_image_verify_with_data(fit, image_noffset, data, size);
}
/**
* fit_all_image_verify - verify data integrity for all images
* @fit: pointer to the FIT format image header

12
common/spl/spl_fit.c
View File

@ -174,6 +174,9 @@ static int spl_load_fit_image(struct spl_load_info *info, ulong sector,
uint8_t image_comp = -1, type = -1;
const void *data;
bool external_data = false;
#ifdef CONFIG_SPL_FIT_SIGNATURE
int ret;
#endif
if (IS_ENABLED(CONFIG_SPL_OS_BOOT) && IS_ENABLED(CONFIG_SPL_GZIP)) {
if (fit_image_get_comp(fit, node, &image_comp))
@ -252,7 +255,16 @@ static int spl_load_fit_image(struct spl_load_info *info, ulong sector,
image_info->entry_point = fdt_getprop_u32(fit, node, "entry");
}
#ifdef CONFIG_SPL_FIT_SIGNATURE
printf("## Checking hash(es) for Image %s ...\n",
fit_get_name(fit, node, NULL));
ret = fit_image_verify_with_data(fit, node,
(const void *)load_addr, length);
printf("\n");
return !ret;
#else
return 0;
#endif
}
static int spl_fit_append_fdt(struct spl_image_info *spl_image,

2
include/image.h
View File

@ -1013,6 +1013,8 @@ int fit_add_verification_data(const char *keydir, void *keydest, void *fit,
const char *comment, int require_keys,
const char *engine_id);
int fit_image_verify_with_data(const void *fit, int image_noffset,
const void *data, size_t size);
int fit_image_verify(const void *fit, int noffset);
int fit_config_verify(const void *fit, int conf_noffset);
int fit_all_image_verify(const void *fit);