[people/ms/u-boot.git] / common / image-sig.c

/*
 * Copyright (c) 2013, Google Inc.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */

#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

struct checksum_algo checksum_algos[] = {
	{
		"sha1",
		SHA1_SUM_LEN,
		RSA2048_BYTES,
#if IMAGE_ENABLE_SIGN
		EVP_sha1,
#endif
		sha1_calculate,
		padding_sha1_rsa2048,
	},
	{
		"sha256",
		SHA256_SUM_LEN,
		RSA2048_BYTES,
#if IMAGE_ENABLE_SIGN
		EVP_sha256,
#endif
		sha256_calculate,
		padding_sha256_rsa2048,
	},
	{
		"sha256",
		SHA256_SUM_LEN,
		RSA4096_BYTES,
#if IMAGE_ENABLE_SIGN
		EVP_sha256,
#endif
		sha256_calculate,
		padding_sha256_rsa4096,
	}

};

struct image_sig_algo image_sig_algos[] = {
	{
		"sha1,rsa2048",
		rsa_sign,
		rsa_add_verify_data,
		rsa_verify,
		&checksum_algos[0],
	},
	{
		"sha256,rsa2048",
		rsa_sign,
		rsa_add_verify_data,
		rsa_verify,
		&checksum_algos[1],
	},
	{
		"sha256,rsa4096",
		rsa_sign,
		rsa_add_verify_data,
		rsa_verify,
		&checksum_algos[2],
	}

};

struct image_sig_algo *image_get_sig_algo(const char *name)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(image_sig_algos); i++) {
		if (!strcmp(image_sig_algos[i].name, name))
			return &image_sig_algos[i];
	}

	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;

	if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
		*err_msgp = "Can't get hash algo property";
		return -1;
	}
	memset(info, '\0', sizeof(*info));
	info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
	info->fit = (void *)fit;
	info->node_offset = noffset;
	info->algo = image_get_sig_algo(algo_name);
	info->fdt_blob = gd_fdt_blob();
	info->required_keynode = required_keynode;
	printf("%s:%s", algo_name, info->keyname);

	if (!info->algo) {
		*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.algo->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 */
	for (noffset = fdt_first_subnode(fit, image_noffset);
	     noffset >= 0;
	     noffset = fdt_next_subnode(fit, 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;
	}

	for (noffset = fdt_first_subnode(sig_blob, sig_node);
	     noffset >= 0;
	     noffset = fdt_next_subnode(sig_blob, noffset)) {
		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;
	}

	/* 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) {
		fdt_regions[count].offset = fdt_off_dt_strings(fit) +
				fdt32_to_cpu(strings[0]);
		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.algo->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 */
	for (noffset = fdt_first_subnode(fit, conf_noffset);
	     noffset >= 0;
	     noffset = fdt_next_subnode(fit, 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;
	}

	for (noffset = fdt_first_subnode(sig_blob, sig_node);
	     noffset >= 0;
	     noffset = fdt_next_subnode(sig_blob, noffset)) {
		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());
}
Commit	Line	Data
3e569a6b SG	1	/*
	2	* Copyright (c) 2013, Google Inc.
	3	*
1a459660	4	* SPDX-License-Identifier: GPL-2.0+
3e569a6b SG	5	*/
	6
	7	#ifdef USE_HOSTCC
	8	#include "mkimage.h"
	9	#include <time.h>
	10	#else
	11	#include <common.h>
56518e71 SG	12	#include <malloc.h>
56518e71 SG	13	DECLARE_GLOBAL_DATA_PTR;
3e569a6b	14	#endif /* !USE_HOSTCC*/
3e569a6b	15	#include <image.h>
2b9912e6 JH	16	#include <u-boot/rsa.h>
2b9912e6 JH	17	#include <u-boot/rsa-checksum.h>
3e569a6b	18
4d098529 SG	19	#define IMAGE_MAX_HASHED_NODES 100
4d098529 SG	20
646257d1	21	#ifdef USE_HOSTCC
29a23f9d HS	22	void *host_blob;
29a23f9d HS	23	void image_set_host_blob(void *blob)
646257d1	24	{
29a23f9d HS	25	host_blob = blob;
	26	}
	27	void *image_get_host_blob(void)
	28	{
	29	return host_blob;
646257d1 HS	30	}
	31	#endif
	32
	33	struct checksum_algo checksum_algos[] = {
	34	{
	35	"sha1",
	36	SHA1_SUM_LEN,
db1b5f3d	37	RSA2048_BYTES,
646257d1 HS	38	#if IMAGE_ENABLE_SIGN
646257d1 HS	39	EVP_sha1,
29a23f9d	40	#endif
646257d1 HS	41	sha1_calculate,
646257d1 HS	42	padding_sha1_rsa2048,
646257d1 HS	43	},
	44	{
	45	"sha256",
	46	SHA256_SUM_LEN,
db1b5f3d	47	RSA2048_BYTES,
646257d1 HS	48	#if IMAGE_ENABLE_SIGN
646257d1 HS	49	EVP_sha256,
29a23f9d	50	#endif
646257d1 HS	51	sha256_calculate,
646257d1 HS	52	padding_sha256_rsa2048,
db1b5f3d HS	53	},
	54	{
	55	"sha256",
	56	SHA256_SUM_LEN,
	57	RSA4096_BYTES,
	58	#if IMAGE_ENABLE_SIGN
	59	EVP_sha256,
29a23f9d	60	#endif
db1b5f3d HS	61	sha256_calculate,
db1b5f3d HS	62	padding_sha256_rsa4096,
646257d1	63	}
db1b5f3d	64
646257d1	65	};
db1b5f3d	66
3e569a6b	67	struct image_sig_algo image_sig_algos[] = {
19c402af SG	68	{
	69	"sha1,rsa2048",
	70	rsa_sign,
	71	rsa_add_verify_data,
	72	rsa_verify,
646257d1 HS	73	&checksum_algos[0],
	74	},
	75	{
	76	"sha256,rsa2048",
	77	rsa_sign,
	78	rsa_add_verify_data,
	79	rsa_verify,
	80	&checksum_algos[1],
db1b5f3d HS	81	},
	82	{
	83	"sha256,rsa4096",
	84	rsa_sign,
	85	rsa_add_verify_data,
	86	rsa_verify,
	87	&checksum_algos[2],
19c402af	88	}
db1b5f3d	89
3e569a6b SG	90	};
	91
	92	struct image_sig_algo image_get_sig_algo(const char name)
	93	{
	94	int i;
	95
	96	for (i = 0; i < ARRAY_SIZE(image_sig_algos); i++) {
	97	if (!strcmp(image_sig_algos[i].name, name))
	98	return &image_sig_algos[i];
	99	}
	100
	101	return NULL;
	102	}
56518e71	103
4d098529 SG	104	/**
	105	* fit_region_make_list() - Make a list of image regions
	106	*
	107	* Given a list of fdt_regions, create a list of image_regions. This is a
	108	* simple conversion routine since the FDT and image code use different
	109	* structures.
	110	*
	111	* @fit: FIT image
	112	* @fdt_regions: Pointer to FDT regions
	113	* @count: Number of FDT regions
	114	* @region: Pointer to image regions, which must hold @count records. If
	115	* region is NULL, then (except for an SPL build) the array will be
	116	* allocated.
	117	* @return: Pointer to image regions
	118	*/
	119	struct image_region fit_region_make_list(const void fit,
	120	struct fdt_region *fdt_regions, int count,
	121	struct image_region *region)
	122	{
	123	int i;
	124
	125	debug("Hash regions:\n");
	126	debug("%10s %10s\n", "Offset", "Size");
	127
	128	/*
	129	* Use malloc() except in SPL (to save code size). In SPL the caller
	130	* must allocate the array.
	131	*/
	132	#ifndef CONFIG_SPL_BUILD
	133	if (!region)
	134	region = calloc(sizeof(*region), count);
	135	#endif
	136	if (!region)
	137	return NULL;
	138	for (i = 0; i < count; i++) {
	139	debug("%10x %10x\n", fdt_regions[i].offset,
	140	fdt_regions[i].size);
	141	region[i].data = fit + fdt_regions[i].offset;
	142	region[i].size = fdt_regions[i].size;
	143	}
	144
	145	return region;
	146	}
	147
56518e71 SG	148	static int fit_image_setup_verify(struct image_sign_info *info,
	149	const void *fit, int noffset, int required_keynode,
	150	char **err_msgp)
	151	{
	152	char *algo_name;
	153
	154	if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
	155	*err_msgp = "Can't get hash algo property";
	156	return -1;
	157	}
	158	memset(info, '\0', sizeof(*info));
	159	info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
	160	info->fit = (void *)fit;
	161	info->node_offset = noffset;
	162	info->algo = image_get_sig_algo(algo_name);
	163	info->fdt_blob = gd_fdt_blob();
	164	info->required_keynode = required_keynode;
	165	printf("%s:%s", algo_name, info->keyname);
	166
	167	if (!info->algo) {
	168	*err_msgp = "Unknown signature algorithm";
	169	return -1;
	170	}
	171
	172	return 0;
	173	}
	174
	175	int fit_image_check_sig(const void fit, int noffset, const void data,
	176	size_t size, int required_keynode, char **err_msgp)
	177	{
	178	struct image_sign_info info;
	179	struct image_region region;
	180	uint8_t *fit_value;
	181	int fit_value_len;
	182
	183	*err_msgp = NULL;
	184	if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
	185	err_msgp))
	186	return -1;
	187
	188	if (fit_image_hash_get_value(fit, noffset, &fit_value,
	189	&fit_value_len)) {
	190	*err_msgp = "Can't get hash value property";
	191	return -1;
	192	}
	193
	194	region.data = data;
	195	region.size = size;
	196
	197	if (info.algo->verify(&info, &region, 1, fit_value, fit_value_len)) {
	198	*err_msgp = "Verification failed";
	199	return -1;
	200	}
	201
	202	return 0;
	203	}
	204
	205	static int fit_image_verify_sig(const void *fit, int image_noffset,
	206	const char data, size_t size, const void sig_blob,
	207	int sig_offset)
	208	{
	209	int noffset;
	210	char *err_msg = "";
	211	int verified = 0;
212	int ret;
213
214	/* Process all hash subnodes of the component image node */
215	for (noffset = fdt_first_subnode(fit, image_noffset);
216	noffset >= 0;
217	noffset = fdt_next_subnode(fit, noffset)) {
218	const char *name = fit_get_name(fit, noffset, NULL);
219
220	if (!strncmp(name, FIT_SIG_NODENAME,
221	strlen(FIT_SIG_NODENAME))) {
222	ret = fit_image_check_sig(fit, noffset, data,
223	size, -1, &err_msg);
224	if (ret) {
225	puts("- ");
226	} else {
227	puts("+ ");
228	verified = 1;
229	break;
230	}
231	}
232	}
233
234	if (noffset == -FDT_ERR_TRUNCATED \|\| noffset == -FDT_ERR_BADSTRUCTURE) {
235	err_msg = "Corrupted or truncated tree";
236	goto error;
237	}
238
239	return verified ? 0 : -EPERM;
240
241	error:
242	printf(" error!\n%s for '%s' hash node in '%s' image node\n",
243	err_msg, fit_get_name(fit, noffset, NULL),
244	fit_get_name(fit, image_noffset, NULL));
245	return -1;
246	}
247
248	int fit_image_verify_required_sigs(const void *fit, int image_noffset,
249	const char data, size_t size, const void sig_blob,
250	int *no_sigsp)
251	{
252	int verify_count = 0;
253	int noffset;
254	int sig_node;
255
256	/* Work out what we need to verify */
257	*no_sigsp = 1;
258	sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
259	if (sig_node < 0) {
260	debug("%s: No signature node found: %s\n", __func__,
261	fdt_strerror(sig_node));
262	return 0;
263	}
264
265	for (noffset = fdt_first_subnode(sig_blob, sig_node);
266	noffset >= 0;
267	noffset = fdt_next_subnode(sig_blob, noffset)) {
268	const char *required;
269	int ret;
270
271	required = fdt_getprop(sig_blob, noffset, "required", NULL);
272	if (!required \|\| strcmp(required, "image"))
273	continue;
274	ret = fit_image_verify_sig(fit, image_noffset, data, size,
275	sig_blob, noffset);
276	if (ret) {
277	printf("Failed to verify required signature '%s'\n",
278	fit_get_name(sig_blob, noffset, NULL));
279	return ret;
280	}
281	verify_count++;
282	}
283
284	if (verify_count)
285	*no_sigsp = 0;
286
287	return 0;
288	}
4d098529 SG	289
	290	int fit_config_check_sig(const void *fit, int noffset, int required_keynode,
	291	char **err_msgp)
	292	{
	293	char * const exc_prop[] = {"data"};
	294	const char prop, end, *name;
	295	struct image_sign_info info;
	296	const uint32_t *strings;
	297	uint8_t *fit_value;
	298	int fit_value_len;
	299	int max_regions;
	300	int i, prop_len;
	301	char path[200];
	302	int count;
	303
	304	debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(),
	305	fit_get_name(fit, noffset, NULL),
	306	fit_get_name(gd_fdt_blob(), required_keynode, NULL));
	307	*err_msgp = NULL;
	308	if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
	309	err_msgp))
	310	return -1;
	311
	312	if (fit_image_hash_get_value(fit, noffset, &fit_value,
	313	&fit_value_len)) {
	314	*err_msgp = "Can't get hash value property";
	315	return -1;
	316	}
	317
	318	/* Count the number of strings in the property */
	319	prop = fdt_getprop(fit, noffset, "hashed-nodes", &prop_len);
	320	end = prop ? prop + prop_len : prop;
	321	for (name = prop, count = 0; name < end; name++)
	322	if (!*name)
	323	count++;
	324	if (!count) {
	325	*err_msgp = "Can't get hashed-nodes property";
	326	return -1;
	327	}
	328
	329	/* Add a sanity check here since we are using the stack */
	330	if (count > IMAGE_MAX_HASHED_NODES) {
	331	*err_msgp = "Number of hashed nodes exceeds maximum";
	332	return -1;
	333	}
	334
	335	/* Create a list of node names from those strings */
	336	char *node_inc[count];
	337
	338	debug("Hash nodes (%d):\n", count);
	339	for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
	340	debug(" '%s'\n", name);
	341	node_inc[i] = (char *)name;
	342	}
	343
	344	/*
	345	* Each node can generate one region for each sub-node. Allow for
	346	* 7 sub-nodes (hash@1, signature@1, etc.) and some extra.
	347	*/
	348	max_regions = 20 + count * 7;
	349	struct fdt_region fdt_regions[max_regions];
	350
	351	/* Get a list of regions to hash */
	352	count = fdt_find_regions(fit, node_inc, count,
353	exc_prop, ARRAY_SIZE(exc_prop),
354	fdt_regions, max_regions - 1,
355	path, sizeof(path), 0);
356	if (count < 0) {
357	*err_msgp = "Failed to hash configuration";
358	return -1;
359	}
360	if (count == 0) {
361	*err_msgp = "No data to hash";
362	return -1;
363	}
364	if (count >= max_regions - 1) {
365	*err_msgp = "Too many hash regions";
366	return -1;
367	}
368
369	/* Add the strings */
370	strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
371	if (strings) {
372	fdt_regions[count].offset = fdt_off_dt_strings(fit) +
373	fdt32_to_cpu(strings[0]);
374	fdt_regions[count].size = fdt32_to_cpu(strings[1]);
375	count++;
376	}
377
378	/* Allocate the region list on the stack */
379	struct image_region region[count];
380
381	fit_region_make_list(fit, fdt_regions, count, region);
382	if (info.algo->verify(&info, region, count, fit_value,
383	fit_value_len)) {
384	*err_msgp = "Verification failed";
385	return -1;
386	}
387
388	return 0;
389	}
390
391	static int fit_config_verify_sig(const void *fit, int conf_noffset,
392	const void *sig_blob, int sig_offset)
393	{
394	int noffset;
395	char *err_msg = "";
396	int verified = 0;
397	int ret;
398
399	/* Process all hash subnodes of the component conf node */
400	for (noffset = fdt_first_subnode(fit, conf_noffset);
401	noffset >= 0;
402	noffset = fdt_next_subnode(fit, noffset)) {
403	const char *name = fit_get_name(fit, noffset, NULL);
404
405	if (!strncmp(name, FIT_SIG_NODENAME,
406	strlen(FIT_SIG_NODENAME))) {
407	ret = fit_config_check_sig(fit, noffset, sig_offset,
408	&err_msg);
409	if (ret) {
410	puts("- ");
411	} else {
412	puts("+ ");
413	verified = 1;
414	break;
415	}
416	}
417	}
418
419	if (noffset == -FDT_ERR_TRUNCATED \|\| noffset == -FDT_ERR_BADSTRUCTURE) {
420	err_msg = "Corrupted or truncated tree";
421	goto error;
422	}
423
424	return verified ? 0 : -EPERM;
425
426	error:
427	printf(" error!\n%s for '%s' hash node in '%s' config node\n",
428	err_msg, fit_get_name(fit, noffset, NULL),
429	fit_get_name(fit, conf_noffset, NULL));
430	return -1;
431	}
432
433	int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
434	const void *sig_blob)
435	{
436	int noffset;
437	int sig_node;
438
439	/* Work out what we need to verify */
440	sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
441	if (sig_node < 0) {
442	debug("%s: No signature node found: %s\n", __func__,
443	fdt_strerror(sig_node));
444	return 0;
445	}
446
447	for (noffset = fdt_first_subnode(sig_blob, sig_node);
448	noffset >= 0;
449	noffset = fdt_next_subnode(sig_blob, noffset)) {
450	const char *required;
451	int ret;
452
453	required = fdt_getprop(sig_blob, noffset, "required", NULL);
454	if (!required \|\| strcmp(required, "conf"))
455	continue;
456	ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
457	noffset);
458	if (ret) {
459	printf("Failed to verify required signature '%s'\n",
460	fit_get_name(sig_blob, noffset, NULL));
461	return ret;
462	}
463	}
464
465	return 0;
466	}
467
468	int fit_config_verify(const void *fit, int conf_noffset)
469	{
12df2abe SG	470	return fit_config_verify_required_sigs(fit, conf_noffset,
12df2abe SG	471	gd_fdt_blob());
4d098529	472	}