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7346c1e192
The hashed-strings signature property includes two uint32_t values. The first is unneeded as there should never be a start offset into the strings region. The second, the size, is needed because the added signature node appends to this region. See tools/image-host.c, where a static 0 value is used for the offset. Signed-off-by: Teddy Reed <teddy.reed@gmail.com> Reviewed-by: Simon Glass <sjg@chromium.org>
479 lines
11 KiB
C
479 lines
11 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Copyright (c) 2013, Google Inc.
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*/
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#ifdef USE_HOSTCC
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#include "mkimage.h"
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#include <time.h>
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#else
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#include <common.h>
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#include <malloc.h>
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DECLARE_GLOBAL_DATA_PTR;
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#endif /* !USE_HOSTCC*/
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#include <image.h>
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#include <u-boot/rsa.h>
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#include <u-boot/rsa-checksum.h>
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#define IMAGE_MAX_HASHED_NODES 100
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#ifdef USE_HOSTCC
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void *host_blob;
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void image_set_host_blob(void *blob)
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{
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host_blob = blob;
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}
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void *image_get_host_blob(void)
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{
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return host_blob;
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}
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#endif
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struct checksum_algo checksum_algos[] = {
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{
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.name = "sha1",
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.checksum_len = SHA1_SUM_LEN,
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.der_len = SHA1_DER_LEN,
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.der_prefix = sha1_der_prefix,
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#if IMAGE_ENABLE_SIGN
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.calculate_sign = EVP_sha1,
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#endif
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.calculate = hash_calculate,
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},
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{
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.name = "sha256",
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.checksum_len = SHA256_SUM_LEN,
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.der_len = SHA256_DER_LEN,
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.der_prefix = sha256_der_prefix,
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#if IMAGE_ENABLE_SIGN
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.calculate_sign = EVP_sha256,
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#endif
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.calculate = hash_calculate,
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}
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};
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struct crypto_algo crypto_algos[] = {
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{
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.name = "rsa2048",
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.key_len = RSA2048_BYTES,
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.sign = rsa_sign,
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.add_verify_data = rsa_add_verify_data,
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.verify = rsa_verify,
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},
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{
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.name = "rsa4096",
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.key_len = RSA4096_BYTES,
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.sign = rsa_sign,
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.add_verify_data = rsa_add_verify_data,
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.verify = rsa_verify,
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}
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};
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struct checksum_algo *image_get_checksum_algo(const char *full_name)
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{
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int i;
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const char *name;
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for (i = 0; i < ARRAY_SIZE(checksum_algos); i++) {
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name = checksum_algos[i].name;
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/* Make sure names match and next char is a comma */
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if (!strncmp(name, full_name, strlen(name)) &&
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full_name[strlen(name)] == ',')
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return &checksum_algos[i];
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}
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return NULL;
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}
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struct crypto_algo *image_get_crypto_algo(const char *full_name)
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{
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int i;
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const char *name;
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/* Move name to after the comma */
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name = strchr(full_name, ',');
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if (!name)
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return NULL;
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name += 1;
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for (i = 0; i < ARRAY_SIZE(crypto_algos); i++) {
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if (!strcmp(crypto_algos[i].name, name))
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return &crypto_algos[i];
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}
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return NULL;
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}
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/**
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* fit_region_make_list() - Make a list of image regions
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*
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* Given a list of fdt_regions, create a list of image_regions. This is a
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* simple conversion routine since the FDT and image code use different
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* structures.
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*
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* @fit: FIT image
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* @fdt_regions: Pointer to FDT regions
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* @count: Number of FDT regions
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* @region: Pointer to image regions, which must hold @count records. If
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* region is NULL, then (except for an SPL build) the array will be
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* allocated.
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* @return: Pointer to image regions
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*/
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struct image_region *fit_region_make_list(const void *fit,
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struct fdt_region *fdt_regions, int count,
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struct image_region *region)
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{
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int i;
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debug("Hash regions:\n");
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debug("%10s %10s\n", "Offset", "Size");
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/*
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* Use malloc() except in SPL (to save code size). In SPL the caller
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* must allocate the array.
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*/
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#ifndef CONFIG_SPL_BUILD
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if (!region)
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region = calloc(sizeof(*region), count);
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#endif
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if (!region)
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return NULL;
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for (i = 0; i < count; i++) {
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debug("%10x %10x\n", fdt_regions[i].offset,
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fdt_regions[i].size);
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region[i].data = fit + fdt_regions[i].offset;
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region[i].size = fdt_regions[i].size;
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}
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return region;
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}
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static int fit_image_setup_verify(struct image_sign_info *info,
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const void *fit, int noffset, int required_keynode,
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char **err_msgp)
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{
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char *algo_name;
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if (fdt_totalsize(fit) > CONFIG_FIT_SIGNATURE_MAX_SIZE) {
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*err_msgp = "Total size too large";
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return 1;
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}
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if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
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*err_msgp = "Can't get hash algo property";
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return -1;
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}
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memset(info, '\0', sizeof(*info));
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info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
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info->fit = (void *)fit;
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info->node_offset = noffset;
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info->name = algo_name;
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info->checksum = image_get_checksum_algo(algo_name);
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info->crypto = image_get_crypto_algo(algo_name);
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info->fdt_blob = gd_fdt_blob();
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info->required_keynode = required_keynode;
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printf("%s:%s", algo_name, info->keyname);
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if (!info->checksum || !info->crypto) {
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*err_msgp = "Unknown signature algorithm";
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return -1;
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}
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return 0;
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}
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int fit_image_check_sig(const void *fit, int noffset, const void *data,
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size_t size, int required_keynode, char **err_msgp)
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{
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struct image_sign_info info;
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struct image_region region;
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uint8_t *fit_value;
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int fit_value_len;
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*err_msgp = NULL;
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if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
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err_msgp))
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return -1;
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if (fit_image_hash_get_value(fit, noffset, &fit_value,
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&fit_value_len)) {
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*err_msgp = "Can't get hash value property";
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return -1;
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}
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region.data = data;
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region.size = size;
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if (info.crypto->verify(&info, ®ion, 1, fit_value, fit_value_len)) {
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*err_msgp = "Verification failed";
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return -1;
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}
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return 0;
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}
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static int fit_image_verify_sig(const void *fit, int image_noffset,
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const char *data, size_t size, const void *sig_blob,
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int sig_offset)
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{
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int noffset;
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char *err_msg = "";
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int verified = 0;
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int ret;
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/* Process all hash subnodes of the component image node */
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fdt_for_each_subnode(noffset, fit, image_noffset) {
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const char *name = fit_get_name(fit, noffset, NULL);
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if (!strncmp(name, FIT_SIG_NODENAME,
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strlen(FIT_SIG_NODENAME))) {
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ret = fit_image_check_sig(fit, noffset, data,
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size, -1, &err_msg);
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if (ret) {
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puts("- ");
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} else {
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puts("+ ");
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verified = 1;
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break;
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}
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}
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}
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if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
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err_msg = "Corrupted or truncated tree";
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goto error;
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}
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return verified ? 0 : -EPERM;
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error:
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printf(" error!\n%s for '%s' hash node in '%s' image node\n",
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err_msg, fit_get_name(fit, noffset, NULL),
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fit_get_name(fit, image_noffset, NULL));
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return -1;
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}
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int fit_image_verify_required_sigs(const void *fit, int image_noffset,
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const char *data, size_t size, const void *sig_blob,
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int *no_sigsp)
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{
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int verify_count = 0;
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int noffset;
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int sig_node;
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/* Work out what we need to verify */
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*no_sigsp = 1;
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sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
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if (sig_node < 0) {
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debug("%s: No signature node found: %s\n", __func__,
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fdt_strerror(sig_node));
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return 0;
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}
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fdt_for_each_subnode(noffset, sig_blob, sig_node) {
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const char *required;
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int ret;
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required = fdt_getprop(sig_blob, noffset, "required", NULL);
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if (!required || strcmp(required, "image"))
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continue;
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ret = fit_image_verify_sig(fit, image_noffset, data, size,
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sig_blob, noffset);
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if (ret) {
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printf("Failed to verify required signature '%s'\n",
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fit_get_name(sig_blob, noffset, NULL));
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return ret;
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}
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verify_count++;
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}
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if (verify_count)
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*no_sigsp = 0;
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return 0;
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}
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int fit_config_check_sig(const void *fit, int noffset, int required_keynode,
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char **err_msgp)
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{
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char * const exc_prop[] = {"data"};
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const char *prop, *end, *name;
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struct image_sign_info info;
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const uint32_t *strings;
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uint8_t *fit_value;
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int fit_value_len;
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int max_regions;
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int i, prop_len;
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char path[200];
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int count;
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debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(),
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fit_get_name(fit, noffset, NULL),
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fit_get_name(gd_fdt_blob(), required_keynode, NULL));
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*err_msgp = NULL;
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if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
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err_msgp))
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return -1;
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if (fit_image_hash_get_value(fit, noffset, &fit_value,
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&fit_value_len)) {
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*err_msgp = "Can't get hash value property";
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return -1;
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}
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/* Count the number of strings in the property */
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prop = fdt_getprop(fit, noffset, "hashed-nodes", &prop_len);
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end = prop ? prop + prop_len : prop;
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for (name = prop, count = 0; name < end; name++)
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if (!*name)
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count++;
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if (!count) {
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*err_msgp = "Can't get hashed-nodes property";
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return -1;
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}
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/* Add a sanity check here since we are using the stack */
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if (count > IMAGE_MAX_HASHED_NODES) {
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*err_msgp = "Number of hashed nodes exceeds maximum";
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return -1;
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}
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/* Create a list of node names from those strings */
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char *node_inc[count];
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debug("Hash nodes (%d):\n", count);
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for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
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debug(" '%s'\n", name);
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node_inc[i] = (char *)name;
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}
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/*
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* Each node can generate one region for each sub-node. Allow for
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* 7 sub-nodes (hash-1, signature-1, etc.) and some extra.
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*/
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max_regions = 20 + count * 7;
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struct fdt_region fdt_regions[max_regions];
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/* Get a list of regions to hash */
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count = fdt_find_regions(fit, node_inc, count,
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exc_prop, ARRAY_SIZE(exc_prop),
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fdt_regions, max_regions - 1,
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path, sizeof(path), 0);
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if (count < 0) {
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*err_msgp = "Failed to hash configuration";
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return -1;
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}
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if (count == 0) {
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*err_msgp = "No data to hash";
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return -1;
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}
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if (count >= max_regions - 1) {
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*err_msgp = "Too many hash regions";
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return -1;
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}
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/* Add the strings */
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strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
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if (strings) {
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/*
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* The strings region offset must be a static 0x0.
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* This is set in tool/image-host.c
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*/
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fdt_regions[count].offset = fdt_off_dt_strings(fit);
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fdt_regions[count].size = fdt32_to_cpu(strings[1]);
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count++;
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}
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/* Allocate the region list on the stack */
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struct image_region region[count];
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fit_region_make_list(fit, fdt_regions, count, region);
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if (info.crypto->verify(&info, region, count, fit_value,
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fit_value_len)) {
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*err_msgp = "Verification failed";
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return -1;
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}
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return 0;
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}
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static int fit_config_verify_sig(const void *fit, int conf_noffset,
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const void *sig_blob, int sig_offset)
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{
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int noffset;
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char *err_msg = "";
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int verified = 0;
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int ret;
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/* Process all hash subnodes of the component conf node */
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fdt_for_each_subnode(noffset, fit, conf_noffset) {
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const char *name = fit_get_name(fit, noffset, NULL);
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if (!strncmp(name, FIT_SIG_NODENAME,
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strlen(FIT_SIG_NODENAME))) {
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ret = fit_config_check_sig(fit, noffset, sig_offset,
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&err_msg);
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if (ret) {
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puts("- ");
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} else {
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puts("+ ");
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verified = 1;
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break;
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}
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}
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}
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if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
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err_msg = "Corrupted or truncated tree";
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goto error;
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}
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return verified ? 0 : -EPERM;
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error:
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printf(" error!\n%s for '%s' hash node in '%s' config node\n",
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err_msg, fit_get_name(fit, noffset, NULL),
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fit_get_name(fit, conf_noffset, NULL));
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return -1;
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}
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int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
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const void *sig_blob)
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{
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int noffset;
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int sig_node;
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/* Work out what we need to verify */
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sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
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if (sig_node < 0) {
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debug("%s: No signature node found: %s\n", __func__,
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fdt_strerror(sig_node));
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return 0;
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}
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fdt_for_each_subnode(noffset, sig_blob, sig_node) {
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const char *required;
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int ret;
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required = fdt_getprop(sig_blob, noffset, "required", NULL);
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if (!required || strcmp(required, "conf"))
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continue;
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ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
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noffset);
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if (ret) {
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printf("Failed to verify required signature '%s'\n",
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fit_get_name(sig_blob, noffset, NULL));
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return ret;
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}
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}
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return 0;
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}
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int fit_config_verify(const void *fit, int conf_noffset)
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{
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return fit_config_verify_required_sigs(fit, conf_noffset,
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gd_fdt_blob());
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}
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