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lib: rsa: decouple rsa from FIT image verification

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Introduce new configuration, CONFIG_RSA_VERIFY which will decouple building
RSA functions from FIT verification and allow for adding a RSA-based
signature verification for other file formats, in particular PE file
for UEFI secure boot.

Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
AKASHI Takahiro 2020-02-21 15:12:55 +09:00 committed by Tom Rini
parent d08b16edf8
commit b983cc2da0
11 changed files with 501 additions and 438 deletions
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4
Kconfig
View file

@ -354,6 +354,8 @@ config FIT_SIGNATURE
depends on DM
select HASH
select RSA
select RSA_VERIFY
select IMAGE_SIGN_INFO
help
This option enables signature verification of FIT uImages,
using a hash signed and verified using RSA. If
@ -442,6 +444,8 @@ config SPL_FIT_SIGNATURE
depends on SPL_DM
select SPL_FIT
select SPL_RSA
select SPL_RSA_VERIFY
select IMAGE_SIGN_INFO
config SPL_LOAD_FIT
bool "Enable SPL loading U-Boot as a FIT (basic fitImage features)"

7
common/Kconfig
View file

@ -1045,3 +1045,10 @@ config BLOBLIST_ADDR
endmenu
source "common/spl/Kconfig"
config IMAGE_SIGN_INFO
bool
select SHA1
select SHA256
help
Enable image_sign_info helper functions.

3
common/Makefile
View file

@ -112,7 +112,8 @@ obj-$(CONFIG_ANDROID_BOOT_IMAGE) += image-android.o image-android-dt.o
obj-$(CONFIG_$(SPL_TPL_)OF_LIBFDT) += image-fdt.o
obj-$(CONFIG_$(SPL_TPL_)FIT) += image-fit.o
obj-$(CONFIG_$(SPL_)MULTI_DTB_FIT) += boot_fit.o common_fit.o
obj-$(CONFIG_$(SPL_TPL_)FIT_SIGNATURE) += image-sig.o
obj-$(CONFIG_IMAGE_SIGN_INFO) += image-sig.o
obj-$(CONFIG_$(SPL_TPL_)FIT_SIGNATURE) += image-fit-sig.o
obj-$(CONFIG_$(SPL_TPL_)FIT_CIPHER) += image-cipher.o
obj-$(CONFIG_IO_TRACE) += iotrace.o
obj-y += memsize.o

417
common/image-fit-sig.c Normal file
View file

@ -0,0 +1,417 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2013, Google Inc.
*/
#ifdef USE_HOSTCC
#include "mkimage.h"
#include <time.h>
#else
#include <common.h>
#include <malloc.h>
DECLARE_GLOBAL_DATA_PTR;
#endif /* !USE_HOSTCC*/
#include <image.h>
#include <u-boot/rsa.h>
#include <u-boot/rsa-checksum.h>
#define IMAGE_MAX_HASHED_NODES 100
#ifdef USE_HOSTCC
void *host_blob;
void image_set_host_blob(void *blob)
{
host_blob = blob;
}
void *image_get_host_blob(void)
{
return host_blob;
}
#endif
/**
* fit_region_make_list() - Make a list of image regions
*
* Given a list of fdt_regions, create a list of image_regions. This is a
* simple conversion routine since the FDT and image code use different
* structures.
*
* @fit: FIT image
* @fdt_regions: Pointer to FDT regions
* @count: Number of FDT regions
* @region: Pointer to image regions, which must hold @count records. If
* region is NULL, then (except for an SPL build) the array will be
* allocated.
* @return: Pointer to image regions
*/
struct image_region *fit_region_make_list(const void *fit,
struct fdt_region *fdt_regions,
int count,
struct image_region *region)
{
int i;
debug("Hash regions:\n");
debug("%10s %10s\n", "Offset", "Size");
/*
* Use malloc() except in SPL (to save code size). In SPL the caller
* must allocate the array.
*/
#ifndef CONFIG_SPL_BUILD
if (!region)
region = calloc(sizeof(*region), count);
#endif
if (!region)
return NULL;
for (i = 0; i < count; i++) {
debug("%10x %10x\n", fdt_regions[i].offset,
fdt_regions[i].size);
region[i].data = fit + fdt_regions[i].offset;
region[i].size = fdt_regions[i].size;
}
return region;
}
static int fit_image_setup_verify(struct image_sign_info *info,
const void *fit, int noffset,
int required_keynode, char **err_msgp)
{
char *algo_name;
const char *padding_name;
if (fdt_totalsize(fit) > CONFIG_FIT_SIGNATURE_MAX_SIZE) {
*err_msgp = "Total size too large";
return 1;
}
if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
*err_msgp = "Can't get hash algo property";
return -1;
}
padding_name = fdt_getprop(fit, noffset, "padding", NULL);
if (!padding_name)
padding_name = RSA_DEFAULT_PADDING_NAME;
memset(info, '\0', sizeof(*info));
info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
info->fit = (void *)fit;
info->node_offset = noffset;
info->name = algo_name;
info->checksum = image_get_checksum_algo(algo_name);
info->crypto = image_get_crypto_algo(algo_name);
info->padding = image_get_padding_algo(padding_name);
info->fdt_blob = gd_fdt_blob();
info->required_keynode = required_keynode;
printf("%s:%s", algo_name, info->keyname);
if (!info->checksum || !info->crypto || !info->padding) {
*err_msgp = "Unknown signature algorithm";
return -1;
}
return 0;
}
int fit_image_check_sig(const void *fit, int noffset, const void *data,
size_t size, int required_keynode, char **err_msgp)
{
struct image_sign_info info;
struct image_region region;
uint8_t *fit_value;
int fit_value_len;
*err_msgp = NULL;
if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
err_msgp))
return -1;
if (fit_image_hash_get_value(fit, noffset, &fit_value,
&fit_value_len)) {
*err_msgp = "Can't get hash value property";
return -1;
}
region.data = data;
region.size = size;
if (info.crypto->verify(&info, &region, 1, fit_value, fit_value_len)) {
*err_msgp = "Verification failed";
return -1;
}
return 0;
}
static int fit_image_verify_sig(const void *fit, int image_noffset,
const char *data, size_t size,
const void *sig_blob, int sig_offset)
{
int noffset;
char *err_msg = "";
int verified = 0;
int ret;
/* Process all hash subnodes of the component image node */
fdt_for_each_subnode(noffset, fit, image_noffset) {
const char *name = fit_get_name(fit, noffset, NULL);
if (!strncmp(name, FIT_SIG_NODENAME,
strlen(FIT_SIG_NODENAME))) {
ret = fit_image_check_sig(fit, noffset, data,
size, -1, &err_msg);
if (ret) {
puts("- ");
} else {
puts("+ ");
verified = 1;
break;
}
}
}
if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
err_msg = "Corrupted or truncated tree";
goto error;
}
return verified ? 0 : -EPERM;
error:
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 -1;
}
int fit_image_verify_required_sigs(const void *fit, int image_noffset,
const char *data, size_t size,
const void *sig_blob, int *no_sigsp)
{
int verify_count = 0;
int noffset;
int sig_node;
/* Work out what we need to verify */
*no_sigsp = 1;
sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
if (sig_node < 0) {
debug("%s: No signature node found: %s\n", __func__,
fdt_strerror(sig_node));
return 0;
}
fdt_for_each_subnode(noffset, sig_blob, sig_node) {
const char *required;
int ret;
required = fdt_getprop(sig_blob, noffset, "required", NULL);
if (!required || strcmp(required, "image"))
continue;
ret = fit_image_verify_sig(fit, image_noffset, data, size,
sig_blob, noffset);
if (ret) {
printf("Failed to verify required signature '%s'\n",
fit_get_name(sig_blob, noffset, NULL));
return ret;
}
verify_count++;
}
if (verify_count)
*no_sigsp = 0;
return 0;
}
int fit_config_check_sig(const void *fit, int noffset, int required_keynode,
char **err_msgp)
{
char * const exc_prop[] = {"data"};
const char *prop, *end, *name;
struct image_sign_info info;
const uint32_t *strings;
uint8_t *fit_value;
int fit_value_len;
int max_regions;
int i, prop_len;
char path[200];
int count;
debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(),
fit_get_name(fit, noffset, NULL),
fit_get_name(gd_fdt_blob(), required_keynode, NULL));
*err_msgp = NULL;
if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
err_msgp))
return -1;
if (fit_image_hash_get_value(fit, noffset, &fit_value,
&fit_value_len)) {
*err_msgp = "Can't get hash value property";
return -1;
}
/* Count the number of strings in the property */
prop = fdt_getprop(fit, noffset, "hashed-nodes", &prop_len);
end = prop ? prop + prop_len : prop;
for (name = prop, count = 0; name < end; name++)
if (!*name)
count++;
if (!count) {
*err_msgp = "Can't get hashed-nodes property";
return -1;
}
if (prop && prop_len > 0 && prop[prop_len - 1] != '\0') {
*err_msgp = "hashed-nodes property must be null-terminated";
return -1;
}
/* Add a sanity check here since we are using the stack */
if (count > IMAGE_MAX_HASHED_NODES) {
*err_msgp = "Number of hashed nodes exceeds maximum";
return -1;
}
/* Create a list of node names from those strings */
char *node_inc[count];
debug("Hash nodes (%d):\n", count);
for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
debug(" '%s'\n", name);
node_inc[i] = (char *)name;
}
/*
* Each node can generate one region for each sub-node. Allow for
* 7 sub-nodes (hash-1, signature-1, etc.) and some extra.
*/
max_regions = 20 + count * 7;
struct fdt_region fdt_regions[max_regions];
/* Get a list of regions to hash */
count = fdt_find_regions(fit, node_inc, count,
exc_prop, ARRAY_SIZE(exc_prop),
fdt_regions, max_regions - 1,
path, sizeof(path), 0);
if (count < 0) {
*err_msgp = "Failed to hash configuration";
return -1;
}
if (count == 0) {
*err_msgp = "No data to hash";
return -1;
}
if (count >= max_regions - 1) {
*err_msgp = "Too many hash regions";
return -1;
}
/* Add the strings */
strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
if (strings) {
/*
* The strings region offset must be a static 0x0.
* This is set in tool/image-host.c
*/
fdt_regions[count].offset = fdt_off_dt_strings(fit);
fdt_regions[count].size = fdt32_to_cpu(strings[1]);
count++;
}
/* Allocate the region list on the stack */
struct image_region region[count];
fit_region_make_list(fit, fdt_regions, count, region);
if (info.crypto->verify(&info, region, count, fit_value,
fit_value_len)) {
*err_msgp = "Verification failed";
return -1;
}
return 0;
}
static int fit_config_verify_sig(const void *fit, int conf_noffset,
const void *sig_blob, int sig_offset)
{
int noffset;
char *err_msg = "";
int verified = 0;
int ret;
/* Process all hash subnodes of the component conf node */
fdt_for_each_subnode(noffset, fit, conf_noffset) {
const char *name = fit_get_name(fit, noffset, NULL);
if (!strncmp(name, FIT_SIG_NODENAME,
strlen(FIT_SIG_NODENAME))) {
ret = fit_config_check_sig(fit, noffset, sig_offset,
&err_msg);
if (ret) {
puts("- ");
} else {
puts("+ ");
verified = 1;
break;
}
}
}
if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
err_msg = "Corrupted or truncated tree";
goto error;
}
return verified ? 0 : -EPERM;
error:
printf(" error!\n%s for '%s' hash node in '%s' config node\n",
err_msg, fit_get_name(fit, noffset, NULL),
fit_get_name(fit, conf_noffset, NULL));
return -1;
}
int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
const void *sig_blob)
{
int noffset;
int sig_node;
/* Work out what we need to verify */
sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
if (sig_node < 0) {
debug("%s: No signature node found: %s\n", __func__,
fdt_strerror(sig_node));
return 0;
}
fdt_for_each_subnode(noffset, sig_blob, sig_node) {
const char *required;
int ret;
required = fdt_getprop(sig_blob, noffset, "required", NULL);
if (!required || strcmp(required, "conf"))
continue;
ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
noffset);
if (ret) {
printf("Failed to verify required signature '%s'\n",
fit_get_name(sig_blob, noffset, NULL));
return ret;
}
}
return 0;
}
int fit_config_verify(const void *fit, int conf_noffset)
{
return fit_config_verify_required_sigs(fit, conf_noffset,
gd_fdt_blob());
}

6
common/image-fit.c
View file

@ -1269,7 +1269,7 @@ int fit_image_verify_with_data(const void *fit, int image_noffset,
int ret;
/* Verify all required signatures */
if (IMAGE_ENABLE_VERIFY &&
if (FIT_IMAGE_ENABLE_VERIFY &&
fit_image_verify_required_sigs(fit, image_noffset, data, size,
gd_fdt_blob(), &verify_all)) {
err_msg = "Unable to verify required signature";
@ -1291,7 +1291,7 @@ int fit_image_verify_with_data(const void *fit, int image_noffset,
&err_msg))
goto error;
puts("+ ");
} else if (IMAGE_ENABLE_VERIFY && verify_all &&
} else if (FIT_IMAGE_ENABLE_VERIFY && verify_all &&
!strncmp(name, FIT_SIG_NODENAME,
strlen(FIT_SIG_NODENAME))) {
ret = fit_image_check_sig(fit, noffset, data,
@ -1949,7 +1949,7 @@ int fit_image_load(bootm_headers_t *images, ulong addr,
if (image_type == IH_TYPE_KERNEL)
images->fit_uname_cfg = fit_base_uname_config;
if (IMAGE_ENABLE_VERIFY && images->verify) {
if (FIT_IMAGE_ENABLE_VERIFY && images->verify) {
puts(" Verifying Hash Integrity ... ");
if (fit_config_verify(fit, cfg_noffset)) {
puts("Bad Data Hash\n");

396
common/image-sig.c
View file

@ -17,18 +17,6 @@ DECLARE_GLOBAL_DATA_PTR;
#define IMAGE_MAX_HASHED_NODES 100
#ifdef USE_HOSTCC
void *host_blob;
void image_set_host_blob(void *blob)
{
host_blob = blob;
}
void *image_get_host_blob(void)
{
return host_blob;
}
#endif
struct checksum_algo checksum_algos[] = {
{
.name = "sha1",
@ -162,387 +150,3 @@ struct padding_algo *image_get_padding_algo(const char *name)
return NULL;
}
/**
* fit_region_make_list() - Make a list of image regions
*
* Given a list of fdt_regions, create a list of image_regions. This is a
* simple conversion routine since the FDT and image code use different
* structures.
*
* @fit: FIT image
* @fdt_regions: Pointer to FDT regions
* @count: Number of FDT regions
* @region: Pointer to image regions, which must hold @count records. If
* region is NULL, then (except for an SPL build) the array will be
* allocated.
* @return: Pointer to image regions
*/
struct image_region *fit_region_make_list(const void *fit,
struct fdt_region *fdt_regions, int count,
struct image_region *region)
{
int i;
debug("Hash regions:\n");
debug("%10s %10s\n", "Offset", "Size");
/*
* Use malloc() except in SPL (to save code size). In SPL the caller
* must allocate the array.
*/
#ifndef CONFIG_SPL_BUILD
if (!region)
region = calloc(sizeof(*region), count);
#endif
if (!region)
return NULL;
for (i = 0; i < count; i++) {
debug("%10x %10x\n", fdt_regions[i].offset,
fdt_regions[i].size);
region[i].data = fit + fdt_regions[i].offset;
region[i].size = fdt_regions[i].size;
}
return region;
}
static int fit_image_setup_verify(struct image_sign_info *info,
const void *fit, int noffset, int required_keynode,
char **err_msgp)
{
char *algo_name;
const char *padding_name;
if (fdt_totalsize(fit) > CONFIG_FIT_SIGNATURE_MAX_SIZE) {
*err_msgp = "Total size too large";
return 1;
}
if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
*err_msgp = "Can't get hash algo property";
return -1;
}
padding_name = fdt_getprop(fit, noffset, "padding", NULL);
if (!padding_name)
padding_name = RSA_DEFAULT_PADDING_NAME;
memset(info, '\0', sizeof(*info));
info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
info->fit = (void *)fit;
info->node_offset = noffset;
info->name = algo_name;
info->checksum = image_get_checksum_algo(algo_name);
info->crypto = image_get_crypto_algo(algo_name);
info->padding = image_get_padding_algo(padding_name);
info->fdt_blob = gd_fdt_blob();
info->required_keynode = required_keynode;
printf("%s:%s", algo_name, info->keyname);
if (!info->checksum || !info->crypto || !info->padding) {
*err_msgp = "Unknown signature algorithm";
return -1;
}
return 0;
}
int fit_image_check_sig(const void *fit, int noffset, const void *data,
size_t size, int required_keynode, char **err_msgp)
{
struct image_sign_info info;
struct image_region region;
uint8_t *fit_value;
int fit_value_len;
*err_msgp = NULL;
if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
err_msgp))
return -1;
if (fit_image_hash_get_value(fit, noffset, &fit_value,
&fit_value_len)) {
*err_msgp = "Can't get hash value property";
return -1;
}
region.data = data;
region.size = size;
if (info.crypto->verify(&info, &region, 1, fit_value, fit_value_len)) {
*err_msgp = "Verification failed";
return -1;
}
return 0;
}
static int fit_image_verify_sig(const void *fit, int image_noffset,
const char *data, size_t size, const void *sig_blob,
int sig_offset)
{
int noffset;
char *err_msg = "";
int verified = 0;
int ret;
/* Process all hash subnodes of the component image node */
fdt_for_each_subnode(noffset, fit, image_noffset) {
const char *name = fit_get_name(fit, noffset, NULL);
if (!strncmp(name, FIT_SIG_NODENAME,
strlen(FIT_SIG_NODENAME))) {
ret = fit_image_check_sig(fit, noffset, data,
size, -1, &err_msg);
if (ret) {
puts("- ");
} else {
puts("+ ");
verified = 1;
break;
}
}
}
if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
err_msg = "Corrupted or truncated tree";
goto error;
}
return verified ? 0 : -EPERM;
error:
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 -1;
}
int fit_image_verify_required_sigs(const void *fit, int image_noffset,
const char *data, size_t size, const void *sig_blob,
int *no_sigsp)
{
int verify_count = 0;
int noffset;
int sig_node;
/* Work out what we need to verify */
*no_sigsp = 1;
sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
if (sig_node < 0) {
debug("%s: No signature node found: %s\n", __func__,
fdt_strerror(sig_node));
return 0;
}
fdt_for_each_subnode(noffset, sig_blob, sig_node) {
const char *required;
int ret;
required = fdt_getprop(sig_blob, noffset, "required", NULL);
if (!required || strcmp(required, "image"))
continue;
ret = fit_image_verify_sig(fit, image_noffset, data, size,
sig_blob, noffset);
if (ret) {
printf("Failed to verify required signature '%s'\n",
fit_get_name(sig_blob, noffset, NULL));
return ret;
}
verify_count++;
}
if (verify_count)
*no_sigsp = 0;
return 0;
}
int fit_config_check_sig(const void *fit, int noffset, int required_keynode,
char **err_msgp)
{
char * const exc_prop[] = {"data"};
const char *prop, *end, *name;
struct image_sign_info info;
const uint32_t *strings;
uint8_t *fit_value;
int fit_value_len;
int max_regions;
int i, prop_len;
char path[200];
int count;
debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(),
fit_get_name(fit, noffset, NULL),
fit_get_name(gd_fdt_blob(), required_keynode, NULL));
*err_msgp = NULL;
if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
err_msgp))
return -1;
if (fit_image_hash_get_value(fit, noffset, &fit_value,
&fit_value_len)) {
*err_msgp = "Can't get hash value property";
return -1;
}
/* Count the number of strings in the property */
prop = fdt_getprop(fit, noffset, "hashed-nodes", &prop_len);
end = prop ? prop + prop_len : prop;
for (name = prop, count = 0; name < end; name++)
if (!*name)
count++;
if (!count) {
*err_msgp = "Can't get hashed-nodes property";
return -1;
}
if (prop && prop_len > 0 && prop[prop_len - 1] != '\0') {
*err_msgp = "hashed-nodes property must be null-terminated";
return -1;
}
/* Add a sanity check here since we are using the stack */
if (count > IMAGE_MAX_HASHED_NODES) {
*err_msgp = "Number of hashed nodes exceeds maximum";
return -1;
}
/* Create a list of node names from those strings */
char *node_inc[count];
debug("Hash nodes (%d):\n", count);
for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
debug(" '%s'\n", name);
node_inc[i] = (char *)name;
}
/*
* Each node can generate one region for each sub-node. Allow for
* 7 sub-nodes (hash-1, signature-1, etc.) and some extra.
*/
max_regions = 20 + count * 7;
struct fdt_region fdt_regions[max_regions];
/* Get a list of regions to hash */
count = fdt_find_regions(fit, node_inc, count,
exc_prop, ARRAY_SIZE(exc_prop),
fdt_regions, max_regions - 1,
path, sizeof(path), 0);
if (count < 0) {
*err_msgp = "Failed to hash configuration";
return -1;
}
if (count == 0) {
*err_msgp = "No data to hash";
return -1;
}
if (count >= max_regions - 1) {
*err_msgp = "Too many hash regions";
return -1;
}
/* Add the strings */
strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
if (strings) {
/*
* The strings region offset must be a static 0x0.
* This is set in tool/image-host.c
*/
fdt_regions[count].offset = fdt_off_dt_strings(fit);
fdt_regions[count].size = fdt32_to_cpu(strings[1]);
count++;
}
/* Allocate the region list on the stack */
struct image_region region[count];
fit_region_make_list(fit, fdt_regions, count, region);
if (info.crypto->verify(&info, region, count, fit_value,
fit_value_len)) {
*err_msgp = "Verification failed";
return -1;
}
return 0;
}
static int fit_config_verify_sig(const void *fit, int conf_noffset,
const void *sig_blob, int sig_offset)
{
int noffset;
char *err_msg = "";
int verified = 0;
int ret;
/* Process all hash subnodes of the component conf node */
fdt_for_each_subnode(noffset, fit, conf_noffset) {
const char *name = fit_get_name(fit, noffset, NULL);
if (!strncmp(name, FIT_SIG_NODENAME,
strlen(FIT_SIG_NODENAME))) {
ret = fit_config_check_sig(fit, noffset, sig_offset,
&err_msg);
if (ret) {
puts("- ");
} else {
puts("+ ");
verified = 1;
break;
}
}
}
if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
err_msg = "Corrupted or truncated tree";
goto error;
}
return verified ? 0 : -EPERM;
error:
printf(" error!\n%s for '%s' hash node in '%s' config node\n",
err_msg, fit_get_name(fit, noffset, NULL),
fit_get_name(fit, conf_noffset, NULL));
return -1;
}
int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
const void *sig_blob)
{
int noffset;
int sig_node;
/* Work out what we need to verify */
sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
if (sig_node < 0) {
debug("%s: No signature node found: %s\n", __func__,
fdt_strerror(sig_node));
return 0;
}
fdt_for_each_subnode(noffset, sig_blob, sig_node) {
const char *required;
int ret;
required = fdt_getprop(sig_blob, noffset, "required", NULL);
if (!required || strcmp(required, "conf"))
continue;
ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
noffset);
if (ret) {
printf("Failed to verify required signature '%s'\n",
fit_get_name(sig_blob, noffset, NULL));
return ret;
}
}
return 0;
}
int fit_config_verify(const void *fit, int conf_noffset)
{
return fit_config_verify_required_sigs(fit, conf_noffset,
gd_fdt_blob());
}

14
include/image.h
View file

@ -1114,6 +1114,7 @@ int fit_conf_get_prop_node(const void *fit, int noffset,
int fit_check_ramdisk(const void *fit, int os_noffset,
uint8_t arch, int verify);
#endif /* IMAGE_ENABLE_FIT */
int calculate_hash(const void *data, int data_len, const char *algo,
uint8_t *value, int *value_len);
@ -1126,16 +1127,20 @@ int calculate_hash(const void *data, int data_len, const char *algo,
# if defined(CONFIG_FIT_SIGNATURE)
# define IMAGE_ENABLE_SIGN 1
# define IMAGE_ENABLE_VERIFY 1
# define FIT_IMAGE_ENABLE_VERIFY 1
# include <openssl/evp.h>
# else
# define IMAGE_ENABLE_SIGN 0
# define IMAGE_ENABLE_VERIFY 0
# define FIT_IMAGE_ENABLE_VERIFY 0
# endif
#else
# define IMAGE_ENABLE_SIGN 0
# define IMAGE_ENABLE_VERIFY CONFIG_IS_ENABLED(FIT_SIGNATURE)
# define IMAGE_ENABLE_VERIFY CONFIG_IS_ENABLED(RSA_VERIFY)
# define FIT_IMAGE_ENABLE_VERIFY CONFIG_IS_ENABLED(FIT_SIGNATURE)
#endif
#if IMAGE_ENABLE_FIT
#ifdef USE_HOSTCC
void *image_get_host_blob(void);
void image_set_host_blob(void *host_blob);
@ -1149,6 +1154,7 @@ void image_set_host_blob(void *host_blob);
#else
#define IMAGE_ENABLE_BEST_MATCH 0
#endif
#endif /* IMAGE_ENABLE_FIT */
/* Information passed to the signing routines */
struct image_sign_info {
@ -1166,16 +1172,12 @@ struct image_sign_info {
const char *engine_id; /* Engine to use for signing */
};
#endif /* Allow struct image_region to always be defined for rsa.h */
/* A part of an image, used for hashing */
struct image_region {
const void *data;
int size;
};
#if IMAGE_ENABLE_FIT
#if IMAGE_ENABLE_VERIFY
# include <u-boot/rsa-checksum.h>
#endif
@ -1276,6 +1278,8 @@ struct crypto_algo *image_get_crypto_algo(const char *full_name);
*/
struct padding_algo *image_get_padding_algo(const char *name);
#if IMAGE_ENABLE_FIT
/**
* fit_image_verify_required_sigs() - Verify signatures marked as 'required'
*

10
lib/rsa/Kconfig
View file

@ -18,6 +18,16 @@ if RSA
config SPL_RSA
bool "Use RSA Library within SPL"
config SPL_RSA_VERIFY
bool
help
Add RSA signature verification support in SPL.
config RSA_VERIFY
bool
help
Add RSA signature verification support.
config RSA_SOFTWARE_EXP
bool "Enable driver for RSA Modular Exponentiation in software"
depends on DM

2
lib/rsa/Makefile
View file

@ -5,5 +5,5 @@
# (C) Copyright 2000-2007
# Wolfgang Denk, DENX Software Engineering, wd@denx.de.
obj-$(CONFIG_$(SPL_)FIT_SIGNATURE) += rsa-verify.o rsa-checksum.o
obj-$(CONFIG_$(SPL_)RSA_VERIFY) += rsa-verify.o rsa-checksum.o
obj-$(CONFIG_RSA_SOFTWARE_EXP) += rsa-mod-exp.o

42
lib/rsa/rsa-verify.c
View file

@ -271,6 +271,7 @@ out:
}
#endif
#if CONFIG_IS_ENABLED(FIT_SIGNATURE)
/**
* rsa_verify_key() - Verify a signature against some data using RSA Key
*
@ -342,7 +343,9 @@ static int rsa_verify_key(struct image_sign_info *info,
return 0;
}
#endif
#if CONFIG_IS_ENABLED(FIT_SIGNATURE)
/**
* rsa_verify_with_keynode() - Verify a signature against some data using
* information in node with prperties of RSA Key like modulus, exponent etc.
@ -396,18 +399,22 @@ static int rsa_verify_with_keynode(struct image_sign_info *info,
return ret;
}
#else
static int rsa_verify_with_keynode(struct image_sign_info *info,
const void *hash, uint8_t *sig,
uint sig_len, int node)
{
return -EACCES;
}
#endif
int rsa_verify(struct image_sign_info *info,
const struct image_region region[], int region_count,
uint8_t *sig, uint sig_len)
{
const void *blob = info->fdt_blob;
/* Reserve memory for maximum checksum-length */
uint8_t hash[info->crypto->key_len];
int ndepth, noffset;
int sig_node, node;
char name[100];
int ret;
int ret = -EACCES;
/*
* Verify that the checksum-length does not exceed the
@ -420,12 +427,6 @@ int rsa_verify(struct image_sign_info *info,
return -EINVAL;
}
sig_node = fdt_subnode_offset(blob, 0, FIT_SIG_NODENAME);
if (sig_node < 0) {
debug("%s: No signature node found\n", __func__);
return -ENOENT;
}
/* Calculate checksum with checksum-algorithm */
ret = info->checksum->calculate(info->checksum->name,
region, region_count, hash);
@ -434,6 +435,18 @@ int rsa_verify(struct image_sign_info *info,
return -EINVAL;
}
if (CONFIG_IS_ENABLED(FIT_SIGNATURE)) {
const void *blob = info->fdt_blob;
int ndepth, noffset;
int sig_node, node;
char name[100];
sig_node = fdt_subnode_offset(blob, 0, FIT_SIG_NODENAME);
if (sig_node < 0) {
debug("%s: No signature node found\n", __func__);
return -ENOENT;
}
/* See if we must use a particular key */
if (info->required_keynode != -1) {
ret = rsa_verify_with_keynode(info, hash, sig, sig_len,
@ -449,16 +462,19 @@ int rsa_verify(struct image_sign_info *info,
return ret;
/* No luck, so try each of the keys in turn */
for (ndepth = 0, noffset = fdt_next_node(info->fit, sig_node, &ndepth);
for (ndepth = 0, noffset = fdt_next_node(info->fit, sig_node,
&ndepth);
(noffset >= 0) && (ndepth > 0);
noffset = fdt_next_node(info->fit, noffset, &ndepth)) {
if (ndepth == 1 && noffset != node) {
ret = rsa_verify_with_keynode(info, hash, sig, sig_len,
ret = rsa_verify_with_keynode(info, hash,
sig, sig_len,
noffset);
if (!ret)
break;
}
}
}
return ret;
}

2
tools/Makefile
View file

@ -58,7 +58,7 @@ hostprogs-$(CONFIG_FIT_SIGNATURE) += fit_info fit_check_sign
hostprogs-$(CONFIG_CMD_BOOTEFI_SELFTEST) += file2include
FIT_OBJS-$(CONFIG_FIT) := fit_common.o fit_image.o image-host.o common/image-fit.o
FIT_SIG_OBJS-$(CONFIG_FIT_SIGNATURE) := common/image-sig.o
FIT_SIG_OBJS-$(CONFIG_FIT_SIGNATURE) := common/image-sig.o common/image-fit-sig.o
FIT_CIPHER_OBJS-$(CONFIG_FIT_CIPHER) := common/image-cipher.o
# The following files are synced with upstream DTC.