2 * Copyright (c) 2013, Google Inc.
4 * SPDX-License-Identifier: GPL-2.0+
13 DECLARE_GLOBAL_DATA_PTR;
14 #endif /* !USE_HOSTCC*/
16 #include <u-boot/rsa.h>
17 #include <u-boot/rsa-checksum.h>
19 #define IMAGE_MAX_HASHED_NODES 100
23 void image_set_host_blob(void *blob)
27 void *image_get_host_blob(void)
33 struct checksum_algo checksum_algos[] = {
36 .checksum_len = SHA1_SUM_LEN,
37 .der_len = SHA1_DER_LEN,
38 .der_prefix = sha1_der_prefix,
40 .calculate_sign = EVP_sha1,
42 .calculate = hash_calculate,
46 .checksum_len = SHA256_SUM_LEN,
47 .der_len = SHA256_DER_LEN,
48 .der_prefix = sha256_der_prefix,
50 .calculate_sign = EVP_sha256,
52 .calculate = hash_calculate,
57 struct crypto_algo crypto_algos[] = {
60 .key_len = RSA2048_BYTES,
62 .add_verify_data = rsa_add_verify_data,
67 .key_len = RSA4096_BYTES,
69 .add_verify_data = rsa_add_verify_data,
75 struct checksum_algo *image_get_checksum_algo(const char *full_name)
80 for (i = 0; i < ARRAY_SIZE(checksum_algos); i++) {
81 name = checksum_algos[i].name;
82 /* Make sure names match and next char is a comma */
83 if (!strncmp(name, full_name, strlen(name)) &&
84 full_name[strlen(name)] == ',')
85 return &checksum_algos[i];
91 struct crypto_algo *image_get_crypto_algo(const char *full_name)
96 /* Move name to after the comma */
97 name = strchr(full_name, ',');
102 for (i = 0; i < ARRAY_SIZE(crypto_algos); i++) {
103 if (!strcmp(crypto_algos[i].name, name))
104 return &crypto_algos[i];
111 * fit_region_make_list() - Make a list of image regions
113 * Given a list of fdt_regions, create a list of image_regions. This is a
114 * simple conversion routine since the FDT and image code use different
118 * @fdt_regions: Pointer to FDT regions
119 * @count: Number of FDT regions
120 * @region: Pointer to image regions, which must hold @count records. If
121 * region is NULL, then (except for an SPL build) the array will be
123 * @return: Pointer to image regions
125 struct image_region *fit_region_make_list(const void *fit,
126 struct fdt_region *fdt_regions, int count,
127 struct image_region *region)
131 debug("Hash regions:\n");
132 debug("%10s %10s\n", "Offset", "Size");
135 * Use malloc() except in SPL (to save code size). In SPL the caller
136 * must allocate the array.
138 #ifndef CONFIG_SPL_BUILD
140 region = calloc(sizeof(*region), count);
144 for (i = 0; i < count; i++) {
145 debug("%10x %10x\n", fdt_regions[i].offset,
146 fdt_regions[i].size);
147 region[i].data = fit + fdt_regions[i].offset;
148 region[i].size = fdt_regions[i].size;
154 static int fit_image_setup_verify(struct image_sign_info *info,
155 const void *fit, int noffset, int required_keynode,
160 if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
161 *err_msgp = "Can't get hash algo property";
164 memset(info, '\0', sizeof(*info));
165 info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
166 info->fit = (void *)fit;
167 info->node_offset = noffset;
168 info->name = algo_name;
169 info->checksum = image_get_checksum_algo(algo_name);
170 info->crypto = image_get_crypto_algo(algo_name);
171 info->fdt_blob = gd_fdt_blob();
172 info->required_keynode = required_keynode;
173 printf("%s:%s", algo_name, info->keyname);
175 if (!info->checksum || !info->crypto) {
176 *err_msgp = "Unknown signature algorithm";
183 int fit_image_check_sig(const void *fit, int noffset, const void *data,
184 size_t size, int required_keynode, char **err_msgp)
186 struct image_sign_info info;
187 struct image_region region;
192 if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
196 if (fit_image_hash_get_value(fit, noffset, &fit_value,
198 *err_msgp = "Can't get hash value property";
205 if (info.crypto->verify(&info, ®ion, 1, fit_value, fit_value_len)) {
206 *err_msgp = "Verification failed";
213 static int fit_image_verify_sig(const void *fit, int image_noffset,
214 const char *data, size_t size, const void *sig_blob,
222 /* Process all hash subnodes of the component image node */
223 fdt_for_each_subnode(noffset, fit, image_noffset) {
224 const char *name = fit_get_name(fit, noffset, NULL);
226 if (!strncmp(name, FIT_SIG_NODENAME,
227 strlen(FIT_SIG_NODENAME))) {
228 ret = fit_image_check_sig(fit, noffset, data,
240 if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
241 err_msg = "Corrupted or truncated tree";
245 return verified ? 0 : -EPERM;
248 printf(" error!\n%s for '%s' hash node in '%s' image node\n",
249 err_msg, fit_get_name(fit, noffset, NULL),
250 fit_get_name(fit, image_noffset, NULL));
254 int fit_image_verify_required_sigs(const void *fit, int image_noffset,
255 const char *data, size_t size, const void *sig_blob,
258 int verify_count = 0;
262 /* Work out what we need to verify */
264 sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
266 debug("%s: No signature node found: %s\n", __func__,
267 fdt_strerror(sig_node));
271 fdt_for_each_subnode(noffset, sig_blob, sig_node) {
272 const char *required;
275 required = fdt_getprop(sig_blob, noffset, "required", NULL);
276 if (!required || strcmp(required, "image"))
278 ret = fit_image_verify_sig(fit, image_noffset, data, size,
281 printf("Failed to verify required signature '%s'\n",
282 fit_get_name(sig_blob, noffset, NULL));
294 int fit_config_check_sig(const void *fit, int noffset, int required_keynode,
297 char * const exc_prop[] = {"data"};
298 const char *prop, *end, *name;
299 struct image_sign_info info;
300 const uint32_t *strings;
308 debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(),
309 fit_get_name(fit, noffset, NULL),
310 fit_get_name(gd_fdt_blob(), required_keynode, NULL));
312 if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
316 if (fit_image_hash_get_value(fit, noffset, &fit_value,
318 *err_msgp = "Can't get hash value property";
322 /* Count the number of strings in the property */
323 prop = fdt_getprop(fit, noffset, "hashed-nodes", &prop_len);
324 end = prop ? prop + prop_len : prop;
325 for (name = prop, count = 0; name < end; name++)
329 *err_msgp = "Can't get hashed-nodes property";
333 /* Add a sanity check here since we are using the stack */
334 if (count > IMAGE_MAX_HASHED_NODES) {
335 *err_msgp = "Number of hashed nodes exceeds maximum";
339 /* Create a list of node names from those strings */
340 char *node_inc[count];
342 debug("Hash nodes (%d):\n", count);
343 for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
344 debug(" '%s'\n", name);
345 node_inc[i] = (char *)name;
349 * Each node can generate one region for each sub-node. Allow for
350 * 7 sub-nodes (hash@1, signature@1, etc.) and some extra.
352 max_regions = 20 + count * 7;
353 struct fdt_region fdt_regions[max_regions];
355 /* Get a list of regions to hash */
356 count = fdt_find_regions(fit, node_inc, count,
357 exc_prop, ARRAY_SIZE(exc_prop),
358 fdt_regions, max_regions - 1,
359 path, sizeof(path), 0);
361 *err_msgp = "Failed to hash configuration";
365 *err_msgp = "No data to hash";
368 if (count >= max_regions - 1) {
369 *err_msgp = "Too many hash regions";
373 /* Add the strings */
374 strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
376 fdt_regions[count].offset = fdt_off_dt_strings(fit) +
377 fdt32_to_cpu(strings[0]);
378 fdt_regions[count].size = fdt32_to_cpu(strings[1]);
382 /* Allocate the region list on the stack */
383 struct image_region region[count];
385 fit_region_make_list(fit, fdt_regions, count, region);
386 if (info.crypto->verify(&info, region, count, fit_value,
388 *err_msgp = "Verification failed";
395 static int fit_config_verify_sig(const void *fit, int conf_noffset,
396 const void *sig_blob, int sig_offset)
403 /* Process all hash subnodes of the component conf node */
404 fdt_for_each_subnode(noffset, fit, conf_noffset) {
405 const char *name = fit_get_name(fit, noffset, NULL);
407 if (!strncmp(name, FIT_SIG_NODENAME,
408 strlen(FIT_SIG_NODENAME))) {
409 ret = fit_config_check_sig(fit, noffset, sig_offset,
421 if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
422 err_msg = "Corrupted or truncated tree";
426 return verified ? 0 : -EPERM;
429 printf(" error!\n%s for '%s' hash node in '%s' config node\n",
430 err_msg, fit_get_name(fit, noffset, NULL),
431 fit_get_name(fit, conf_noffset, NULL));
435 int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
436 const void *sig_blob)
441 /* Work out what we need to verify */
442 sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
444 debug("%s: No signature node found: %s\n", __func__,
445 fdt_strerror(sig_node));
449 fdt_for_each_subnode(noffset, sig_blob, sig_node) {
450 const char *required;
453 required = fdt_getprop(sig_blob, noffset, "required", NULL);
454 if (!required || strcmp(required, "conf"))
456 ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
459 printf("Failed to verify required signature '%s'\n",
460 fit_get_name(sig_blob, noffset, NULL));
468 int fit_config_verify(const void *fit, int conf_noffset)
470 return fit_config_verify_required_sigs(fit, conf_noffset,