1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (c) 2013, Google Inc.
12 DECLARE_GLOBAL_DATA_PTR;
13 #endif /* !USE_HOSTCC*/
15 #include <u-boot/rsa.h>
16 #include <u-boot/rsa-checksum.h>
18 #define IMAGE_MAX_HASHED_NODES 100
22 void image_set_host_blob(void *blob)
26 void *image_get_host_blob(void)
32 struct checksum_algo checksum_algos[] = {
35 .checksum_len = SHA1_SUM_LEN,
36 .der_len = SHA1_DER_LEN,
37 .der_prefix = sha1_der_prefix,
39 .calculate_sign = EVP_sha1,
41 .calculate = hash_calculate,
45 .checksum_len = SHA256_SUM_LEN,
46 .der_len = SHA256_DER_LEN,
47 .der_prefix = sha256_der_prefix,
49 .calculate_sign = EVP_sha256,
51 .calculate = hash_calculate,
56 struct crypto_algo crypto_algos[] = {
59 .key_len = RSA2048_BYTES,
61 .add_verify_data = rsa_add_verify_data,
66 .key_len = RSA4096_BYTES,
68 .add_verify_data = rsa_add_verify_data,
74 struct padding_algo padding_algos[] = {
77 .verify = padding_pkcs_15_verify,
81 struct checksum_algo *image_get_checksum_algo(const char *full_name)
86 for (i = 0; i < ARRAY_SIZE(checksum_algos); i++) {
87 name = checksum_algos[i].name;
88 /* Make sure names match and next char is a comma */
89 if (!strncmp(name, full_name, strlen(name)) &&
90 full_name[strlen(name)] == ',')
91 return &checksum_algos[i];
97 struct crypto_algo *image_get_crypto_algo(const char *full_name)
102 /* Move name to after the comma */
103 name = strchr(full_name, ',');
108 for (i = 0; i < ARRAY_SIZE(crypto_algos); i++) {
109 if (!strcmp(crypto_algos[i].name, name))
110 return &crypto_algos[i];
116 struct padding_algo *image_get_padding_algo(const char *name)
123 for (i = 0; i < ARRAY_SIZE(padding_algos); i++) {
124 if (!strcmp(padding_algos[i].name, name))
125 return &padding_algos[i];
132 * fit_region_make_list() - Make a list of image regions
134 * Given a list of fdt_regions, create a list of image_regions. This is a
135 * simple conversion routine since the FDT and image code use different
139 * @fdt_regions: Pointer to FDT regions
140 * @count: Number of FDT regions
141 * @region: Pointer to image regions, which must hold @count records. If
142 * region is NULL, then (except for an SPL build) the array will be
144 * @return: Pointer to image regions
146 struct image_region *fit_region_make_list(const void *fit,
147 struct fdt_region *fdt_regions, int count,
148 struct image_region *region)
152 debug("Hash regions:\n");
153 debug("%10s %10s\n", "Offset", "Size");
156 * Use malloc() except in SPL (to save code size). In SPL the caller
157 * must allocate the array.
159 #ifndef CONFIG_SPL_BUILD
161 region = calloc(sizeof(*region), count);
165 for (i = 0; i < count; i++) {
166 debug("%10x %10x\n", fdt_regions[i].offset,
167 fdt_regions[i].size);
168 region[i].data = fit + fdt_regions[i].offset;
169 region[i].size = fdt_regions[i].size;
175 static int fit_image_setup_verify(struct image_sign_info *info,
176 const void *fit, int noffset, int required_keynode,
180 const char *padding_name;
182 if (fdt_totalsize(fit) > CONFIG_FIT_SIGNATURE_MAX_SIZE) {
183 *err_msgp = "Total size too large";
187 if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
188 *err_msgp = "Can't get hash algo property";
192 padding_name = fdt_getprop(fit, noffset, "padding", NULL);
194 padding_name = RSA_DEFAULT_PADDING_NAME;
196 memset(info, '\0', sizeof(*info));
197 info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
198 info->fit = (void *)fit;
199 info->node_offset = noffset;
200 info->name = algo_name;
201 info->checksum = image_get_checksum_algo(algo_name);
202 info->crypto = image_get_crypto_algo(algo_name);
203 info->padding = image_get_padding_algo(padding_name);
204 info->fdt_blob = gd_fdt_blob();
205 info->required_keynode = required_keynode;
206 printf("%s:%s", algo_name, info->keyname);
208 if (!info->checksum || !info->crypto) {
209 *err_msgp = "Unknown signature algorithm";
216 int fit_image_check_sig(const void *fit, int noffset, const void *data,
217 size_t size, int required_keynode, char **err_msgp)
219 struct image_sign_info info;
220 struct image_region region;
225 if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
229 if (fit_image_hash_get_value(fit, noffset, &fit_value,
231 *err_msgp = "Can't get hash value property";
238 if (info.crypto->verify(&info, ®ion, 1, fit_value, fit_value_len)) {
239 *err_msgp = "Verification failed";
246 static int fit_image_verify_sig(const void *fit, int image_noffset,
247 const char *data, size_t size, const void *sig_blob,
255 /* Process all hash subnodes of the component image node */
256 fdt_for_each_subnode(noffset, fit, image_noffset) {
257 const char *name = fit_get_name(fit, noffset, NULL);
259 if (!strncmp(name, FIT_SIG_NODENAME,
260 strlen(FIT_SIG_NODENAME))) {
261 ret = fit_image_check_sig(fit, noffset, data,
273 if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
274 err_msg = "Corrupted or truncated tree";
278 return verified ? 0 : -EPERM;
281 printf(" error!\n%s for '%s' hash node in '%s' image node\n",
282 err_msg, fit_get_name(fit, noffset, NULL),
283 fit_get_name(fit, image_noffset, NULL));
287 int fit_image_verify_required_sigs(const void *fit, int image_noffset,
288 const char *data, size_t size, const void *sig_blob,
291 int verify_count = 0;
295 /* Work out what we need to verify */
297 sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
299 debug("%s: No signature node found: %s\n", __func__,
300 fdt_strerror(sig_node));
304 fdt_for_each_subnode(noffset, sig_blob, sig_node) {
305 const char *required;
308 required = fdt_getprop(sig_blob, noffset, "required", NULL);
309 if (!required || strcmp(required, "image"))
311 ret = fit_image_verify_sig(fit, image_noffset, data, size,
314 printf("Failed to verify required signature '%s'\n",
315 fit_get_name(sig_blob, noffset, NULL));
327 int fit_config_check_sig(const void *fit, int noffset, int required_keynode,
330 char * const exc_prop[] = {"data"};
331 const char *prop, *end, *name;
332 struct image_sign_info info;
333 const uint32_t *strings;
341 debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(),
342 fit_get_name(fit, noffset, NULL),
343 fit_get_name(gd_fdt_blob(), required_keynode, NULL));
345 if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
349 if (fit_image_hash_get_value(fit, noffset, &fit_value,
351 *err_msgp = "Can't get hash value property";
355 /* Count the number of strings in the property */
356 prop = fdt_getprop(fit, noffset, "hashed-nodes", &prop_len);
357 end = prop ? prop + prop_len : prop;
358 for (name = prop, count = 0; name < end; name++)
362 *err_msgp = "Can't get hashed-nodes property";
366 if (prop && prop_len > 0 && prop[prop_len - 1] != '\0') {
367 *err_msgp = "hashed-nodes property must be null-terminated";
371 /* Add a sanity check here since we are using the stack */
372 if (count > IMAGE_MAX_HASHED_NODES) {
373 *err_msgp = "Number of hashed nodes exceeds maximum";
377 /* Create a list of node names from those strings */
378 char *node_inc[count];
380 debug("Hash nodes (%d):\n", count);
381 for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
382 debug(" '%s'\n", name);
383 node_inc[i] = (char *)name;
387 * Each node can generate one region for each sub-node. Allow for
388 * 7 sub-nodes (hash-1, signature-1, etc.) and some extra.
390 max_regions = 20 + count * 7;
391 struct fdt_region fdt_regions[max_regions];
393 /* Get a list of regions to hash */
394 count = fdt_find_regions(fit, node_inc, count,
395 exc_prop, ARRAY_SIZE(exc_prop),
396 fdt_regions, max_regions - 1,
397 path, sizeof(path), 0);
399 *err_msgp = "Failed to hash configuration";
403 *err_msgp = "No data to hash";
406 if (count >= max_regions - 1) {
407 *err_msgp = "Too many hash regions";
411 /* Add the strings */
412 strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
415 * The strings region offset must be a static 0x0.
416 * This is set in tool/image-host.c
418 fdt_regions[count].offset = fdt_off_dt_strings(fit);
419 fdt_regions[count].size = fdt32_to_cpu(strings[1]);
423 /* Allocate the region list on the stack */
424 struct image_region region[count];
426 fit_region_make_list(fit, fdt_regions, count, region);
427 if (info.crypto->verify(&info, region, count, fit_value,
429 *err_msgp = "Verification failed";
436 static int fit_config_verify_sig(const void *fit, int conf_noffset,
437 const void *sig_blob, int sig_offset)
444 /* Process all hash subnodes of the component conf node */
445 fdt_for_each_subnode(noffset, fit, conf_noffset) {
446 const char *name = fit_get_name(fit, noffset, NULL);
448 if (!strncmp(name, FIT_SIG_NODENAME,
449 strlen(FIT_SIG_NODENAME))) {
450 ret = fit_config_check_sig(fit, noffset, sig_offset,
462 if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
463 err_msg = "Corrupted or truncated tree";
467 return verified ? 0 : -EPERM;
470 printf(" error!\n%s for '%s' hash node in '%s' config node\n",
471 err_msg, fit_get_name(fit, noffset, NULL),
472 fit_get_name(fit, conf_noffset, NULL));
476 int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
477 const void *sig_blob)
482 /* Work out what we need to verify */
483 sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
485 debug("%s: No signature node found: %s\n", __func__,
486 fdt_strerror(sig_node));
490 fdt_for_each_subnode(noffset, sig_blob, sig_node) {
491 const char *required;
494 required = fdt_getprop(sig_blob, noffset, "required", NULL);
495 if (!required || strcmp(required, "conf"))
497 ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
500 printf("Failed to verify required signature '%s'\n",
501 fit_get_name(sig_blob, noffset, NULL));
509 int fit_config_verify(const void *fit, int conf_noffset)
511 return fit_config_verify_required_sigs(fit, conf_noffset,