[thirdparty/u-boot.git] / common / image-fit-sig.c

// 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 <log.h>
#include <malloc.h>
DECLARE_GLOBAL_DATA_PTR;
#endif /* !USE_HOSTCC*/
#include <fdt_region.h>
#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, FIT_KEY_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, FIT_KEY_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;
}

/**
 * fit_config_check_sig() - Check the signature of a config
 *
 * @fit: FIT to check
 * @noffset: Offset of configuration node (e.g. /configurations/conf-1)
 * @required_keynode:	Offset in the control FDT of the required key node,
 *			if any. If this is given, then the configuration wil not
 *			pass verification unless that key is used. If this is
 *			-1 then any signature will do.
 * @conf_noffset: Offset of the configuration subnode being checked (e.g.
 *	 /configurations/conf-1/kernel)
 * @err_msgp:		In the event of an error, this will be pointed to a
 *			help error string to display to the user.
 * @return 0 if all verified ok, <0 on error
 */
static int fit_config_check_sig(const void *fit, int noffset,
				int required_keynode, int conf_noffset,
				char **err_msgp)
{
	char * const exc_prop[] = {"data", "data-size", "data-position"};
	const char *prop, *end, *name;
	struct image_sign_info info;
	const uint32_t *strings;
	const char *config_name;
	uint8_t *fit_value;
	int fit_value_len;
	bool found_config;
	int max_regions;
	int i, prop_len;
	char path[200];
	int count;

	config_name = fit_get_name(fit, conf_noffset, NULL);
	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);
	found_config = false;
	for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
		debug("   '%s'\n", name);
		node_inc[i] = (char *)name;
		if (!strncmp(FIT_CONFS_PATH, name, strlen(FIT_CONFS_PATH)) &&
		    name[sizeof(FIT_CONFS_PATH) - 1] == '/' &&
		    !strcmp(name + sizeof(FIT_CONFS_PATH), config_name)) {
			debug("      (found config node %s)", config_name);
			found_config = true;
		}
	}
	if (!found_config) {
		*err_msgp = "Selected config not in hashed nodes";
		return -1;
	}

	/*
	 * 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,
						   conf_noffset, &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;
	}

	if (verified)
		return 0;

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 -EPERM;
}

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, FIT_KEY_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
b983cc2d AT	1	// SPDX-License-Identifier: GPL-2.0+
	2	/*
	3	* Copyright (c) 2013, Google Inc.
	4	*/
	5
	6	#ifdef USE_HOSTCC
	7	#include "mkimage.h"
	8	#include <time.h>
	9	#else
	10	#include <common.h>
f7ae49fc	11	#include <log.h>
b983cc2d AT	12	#include <malloc.h>
	13	DECLARE_GLOBAL_DATA_PTR;
	14	#endif /* !USE_HOSTCC*/
64045a6a	15	#include <fdt_region.h>
b983cc2d AT	16	#include <image.h>
	17	#include <u-boot/rsa.h>
	18	#include <u-boot/rsa-checksum.h>
	19
	20	#define IMAGE_MAX_HASHED_NODES 100
	21
	22	#ifdef USE_HOSTCC
	23	void *host_blob;
	24
	25	void image_set_host_blob(void *blob)
	26	{
	27	host_blob = blob;
	28	}
	29
	30	void *image_get_host_blob(void)
	31	{
	32	return host_blob;
	33	}
	34	#endif
	35
	36	/**
	37	* fit_region_make_list() - Make a list of image regions
	38	*
	39	* Given a list of fdt_regions, create a list of image_regions. This is a
	40	* simple conversion routine since the FDT and image code use different
	41	* structures.
	42	*
	43	* @fit: FIT image
	44	* @fdt_regions: Pointer to FDT regions
	45	* @count: Number of FDT regions
	46	* @region: Pointer to image regions, which must hold @count records. If
	47	* region is NULL, then (except for an SPL build) the array will be
	48	* allocated.
	49	* @return: Pointer to image regions
	50	*/
	51	struct image_region fit_region_make_list(const void fit,
	52	struct fdt_region *fdt_regions,
	53	int count,
	54	struct image_region *region)
	55	{
	56	int i;
	57
	58	debug("Hash regions:\n");
	59	debug("%10s %10s\n", "Offset", "Size");
	60
	61	/*
	62	* Use malloc() except in SPL (to save code size). In SPL the caller
	63	* must allocate the array.
	64	*/
	65	#ifndef CONFIG_SPL_BUILD
	66	if (!region)
	67	region = calloc(sizeof(*region), count);
	68	#endif
	69	if (!region)
	70	return NULL;
	71	for (i = 0; i < count; i++) {
	72	debug("%10x %10x\n", fdt_regions[i].offset,
	73	fdt_regions[i].size);
	74	region[i].data = fit + fdt_regions[i].offset;
	75	region[i].size = fdt_regions[i].size;
	76	}
	77
	78	return region;
	79	}
80
81	static int fit_image_setup_verify(struct image_sign_info *info,
82	const void *fit, int noffset,
83	int required_keynode, char **err_msgp)
84	{
85	char *algo_name;
86	const char *padding_name;
87
88	if (fdt_totalsize(fit) > CONFIG_FIT_SIGNATURE_MAX_SIZE) {
89	*err_msgp = "Total size too large";
90	return 1;
91	}
92
93	if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
94	*err_msgp = "Can't get hash algo property";
95	return -1;
96	}
97
98	padding_name = fdt_getprop(fit, noffset, "padding", NULL);
99	if (!padding_name)
100	padding_name = RSA_DEFAULT_PADDING_NAME;
101
102	memset(info, '\0', sizeof(*info));
1f47e2ac	103	info->keyname = fdt_getprop(fit, noffset, FIT_KEY_HINT, NULL);
b983cc2d AT	104	info->fit = (void *)fit;
	105	info->node_offset = noffset;
	106	info->name = algo_name;
	107	info->checksum = image_get_checksum_algo(algo_name);
	108	info->crypto = image_get_crypto_algo(algo_name);
	109	info->padding = image_get_padding_algo(padding_name);
	110	info->fdt_blob = gd_fdt_blob();
	111	info->required_keynode = required_keynode;
	112	printf("%s:%s", algo_name, info->keyname);
	113
	114	if (!info->checksum \|\| !info->crypto \|\| !info->padding) {
	115	*err_msgp = "Unknown signature algorithm";
	116	return -1;
	117	}
	118
	119	return 0;
	120	}
	121
	122	int fit_image_check_sig(const void fit, int noffset, const void data,
	123	size_t size, int required_keynode, char **err_msgp)
	124	{
	125	struct image_sign_info info;
	126	struct image_region region;
	127	uint8_t *fit_value;
	128	int fit_value_len;
	129
	130	*err_msgp = NULL;
	131	if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
	132	err_msgp))
	133	return -1;
	134
	135	if (fit_image_hash_get_value(fit, noffset, &fit_value,
	136	&fit_value_len)) {
	137	*err_msgp = "Can't get hash value property";
	138	return -1;
	139	}
	140
	141	region.data = data;
	142	region.size = size;
	143
	144	if (info.crypto->verify(&info, &region, 1, fit_value, fit_value_len)) {
	145	*err_msgp = "Verification failed";
	146	return -1;
	147	}
	148
	149	return 0;
	150	}
	151
	152	static int fit_image_verify_sig(const void *fit, int image_noffset,
	153	const char *data, size_t size,
	154	const void *sig_blob, int sig_offset)
	155	{
	156	int noffset;
	157	char *err_msg = "";
	158	int verified = 0;
	159	int ret;
	160
	161	/* Process all hash subnodes of the component image node */
	162	fdt_for_each_subnode(noffset, fit, image_noffset) {
	163	const char *name = fit_get_name(fit, noffset, NULL);
	164
	165	if (!strncmp(name, FIT_SIG_NODENAME,
	166	strlen(FIT_SIG_NODENAME))) {
	167	ret = fit_image_check_sig(fit, noffset, data,
168	size, -1, &err_msg);
169	if (ret) {
170	puts("- ");
171	} else {
172	puts("+ ");
173	verified = 1;
174	break;
175	}
176	}
177	}
178
179	if (noffset == -FDT_ERR_TRUNCATED \|\| noffset == -FDT_ERR_BADSTRUCTURE) {
180	err_msg = "Corrupted or truncated tree";
181	goto error;
182	}
183
184	return verified ? 0 : -EPERM;
185
186	error:
187	printf(" error!\n%s for '%s' hash node in '%s' image node\n",
188	err_msg, fit_get_name(fit, noffset, NULL),
189	fit_get_name(fit, image_noffset, NULL));
190	return -1;
191	}
192
193	int fit_image_verify_required_sigs(const void *fit, int image_noffset,
194	const char *data, size_t size,
195	const void sig_blob, int no_sigsp)
196	{
197	int verify_count = 0;
198	int noffset;
199	int sig_node;
200
201	/* Work out what we need to verify */
202	*no_sigsp = 1;
203	sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
204	if (sig_node < 0) {
205	debug("%s: No signature node found: %s\n", __func__,
206	fdt_strerror(sig_node));
207	return 0;
208	}
209
210	fdt_for_each_subnode(noffset, sig_blob, sig_node) {
211	const char *required;
212	int ret;
213
1f47e2ac TR	214	required = fdt_getprop(sig_blob, noffset, FIT_KEY_REQUIRED,
1f47e2ac TR	215	NULL);
b983cc2d AT	216	if (!required \|\| strcmp(required, "image"))
	217	continue;
	218	ret = fit_image_verify_sig(fit, image_noffset, data, size,
	219	sig_blob, noffset);
	220	if (ret) {
	221	printf("Failed to verify required signature '%s'\n",
	222	fit_get_name(sig_blob, noffset, NULL));
	223	return ret;
	224	}
	225	verify_count++;
	226	}
	227
	228	if (verify_count)
	229	*no_sigsp = 0;
	230
	231	return 0;
	232	}
	233
1f47e2ac TR	234	/**
	235	* fit_config_check_sig() - Check the signature of a config
	236	*
	237	* @fit: FIT to check
	238	* @noffset: Offset of configuration node (e.g. /configurations/conf-1)
	239	* @required_keynode: Offset in the control FDT of the required key node,
	240	* if any. If this is given, then the configuration wil not
	241	* pass verification unless that key is used. If this is
	242	* -1 then any signature will do.
	243	* @conf_noffset: Offset of the configuration subnode being checked (e.g.
	244	* /configurations/conf-1/kernel)
	245	* @err_msgp: In the event of an error, this will be pointed to a
	246	* help error string to display to the user.
	247	* @return 0 if all verified ok, <0 on error
	248	*/
	249	static int fit_config_check_sig(const void *fit, int noffset,
	250	int required_keynode, int conf_noffset,
	251	char **err_msgp)
b983cc2d	252	{
c522949a	253	char * const exc_prop[] = {"data", "data-size", "data-position"};
b983cc2d AT	254	const char prop, end, *name;
	255	struct image_sign_info info;
	256	const uint32_t *strings;
1f47e2ac	257	const char *config_name;
b983cc2d AT	258	uint8_t *fit_value;
b983cc2d AT	259	int fit_value_len;
1f47e2ac	260	bool found_config;
b983cc2d AT	261	int max_regions;
	262	int i, prop_len;
	263	char path[200];
	264	int count;
	265
1f47e2ac	266	config_name = fit_get_name(fit, conf_noffset, NULL);
b983cc2d AT	267	debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(),
	268	fit_get_name(fit, noffset, NULL),
	269	fit_get_name(gd_fdt_blob(), required_keynode, NULL));
	270	*err_msgp = NULL;
	271	if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
	272	err_msgp))
	273	return -1;
	274
	275	if (fit_image_hash_get_value(fit, noffset, &fit_value,
	276	&fit_value_len)) {
	277	*err_msgp = "Can't get hash value property";
	278	return -1;
	279	}
	280
	281	/* Count the number of strings in the property */
	282	prop = fdt_getprop(fit, noffset, "hashed-nodes", &prop_len);
	283	end = prop ? prop + prop_len : prop;
	284	for (name = prop, count = 0; name < end; name++)
	285	if (!*name)
	286	count++;
	287	if (!count) {
	288	*err_msgp = "Can't get hashed-nodes property";
	289	return -1;
	290	}
	291
	292	if (prop && prop_len > 0 && prop[prop_len - 1] != '\0') {
	293	*err_msgp = "hashed-nodes property must be null-terminated";
	294	return -1;
	295	}
	296
	297	/* Add a sanity check here since we are using the stack */
	298	if (count > IMAGE_MAX_HASHED_NODES) {
	299	*err_msgp = "Number of hashed nodes exceeds maximum";
	300	return -1;
	301	}
	302
	303	/* Create a list of node names from those strings */
	304	char *node_inc[count];
	305
	306	debug("Hash nodes (%d):\n", count);
1f47e2ac	307	found_config = false;
b983cc2d AT	308	for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
	309	debug(" '%s'\n", name);
	310	node_inc[i] = (char *)name;
1f47e2ac TR	311	if (!strncmp(FIT_CONFS_PATH, name, strlen(FIT_CONFS_PATH)) &&
	312	name[sizeof(FIT_CONFS_PATH) - 1] == '/' &&
	313	!strcmp(name + sizeof(FIT_CONFS_PATH), config_name)) {
	314	debug(" (found config node %s)", config_name);
	315	found_config = true;
	316	}
	317	}
	318	if (!found_config) {
	319	*err_msgp = "Selected config not in hashed nodes";
	320	return -1;
b983cc2d AT	321	}
	322
	323	/*
	324	* Each node can generate one region for each sub-node. Allow for
	325	* 7 sub-nodes (hash-1, signature-1, etc.) and some extra.
	326	*/
	327	max_regions = 20 + count * 7;
	328	struct fdt_region fdt_regions[max_regions];
	329
	330	/* Get a list of regions to hash */
	331	count = fdt_find_regions(fit, node_inc, count,
	332	exc_prop, ARRAY_SIZE(exc_prop),
	333	fdt_regions, max_regions - 1,
	334	path, sizeof(path), 0);
	335	if (count < 0) {
	336	*err_msgp = "Failed to hash configuration";
	337	return -1;
	338	}
	339	if (count == 0) {
	340	*err_msgp = "No data to hash";
	341	return -1;
	342	}
	343	if (count >= max_regions - 1) {
	344	*err_msgp = "Too many hash regions";
	345	return -1;
	346	}
	347
	348	/* Add the strings */
	349	strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
	350	if (strings) {
	351	/*
	352	* The strings region offset must be a static 0x0.
	353	* This is set in tool/image-host.c
	354	*/
	355	fdt_regions[count].offset = fdt_off_dt_strings(fit);
	356	fdt_regions[count].size = fdt32_to_cpu(strings[1]);
	357	count++;
	358	}
	359
	360	/* Allocate the region list on the stack */
	361	struct image_region region[count];
	362
	363	fit_region_make_list(fit, fdt_regions, count, region);
	364	if (info.crypto->verify(&info, region, count, fit_value,
	365	fit_value_len)) {
	366	*err_msgp = "Verification failed";
	367	return -1;
	368	}
	369
	370	return 0;
	371	}
	372
	373	static int fit_config_verify_sig(const void *fit, int conf_noffset,
	374	const void *sig_blob, int sig_offset)
	375	{
	376	int noffset;
	377	char *err_msg = "";
	378	int verified = 0;
	379	int ret;
	380
	381	/* Process all hash subnodes of the component conf node */
	382	fdt_for_each_subnode(noffset, fit, conf_noffset) {
	383	const char *name = fit_get_name(fit, noffset, NULL);
	384
385	if (!strncmp(name, FIT_SIG_NODENAME,
386	strlen(FIT_SIG_NODENAME))) {
387	ret = fit_config_check_sig(fit, noffset, sig_offset,
1f47e2ac	388	conf_noffset, &err_msg);
b983cc2d AT	389	if (ret) {
	390	puts("- ");
	391	} else {
	392	puts("+ ");
	393	verified = 1;
	394	break;
	395	}
	396	}
	397	}
	398
	399	if (noffset == -FDT_ERR_TRUNCATED \|\| noffset == -FDT_ERR_BADSTRUCTURE) {
	400	err_msg = "Corrupted or truncated tree";
	401	goto error;
	402	}
	403
1f47e2ac TR	404	if (verified)
1f47e2ac TR	405	return 0;
b983cc2d AT	406
	407	error:
	408	printf(" error!\n%s for '%s' hash node in '%s' config node\n",
	409	err_msg, fit_get_name(fit, noffset, NULL),
	410	fit_get_name(fit, conf_noffset, NULL));
1f47e2ac	411	return -EPERM;
b983cc2d AT	412	}
	413
	414	int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
	415	const void *sig_blob)
	416	{
	417	int noffset;
	418	int sig_node;
	419
	420	/* Work out what we need to verify */
	421	sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
	422	if (sig_node < 0) {
	423	debug("%s: No signature node found: %s\n", __func__,
	424	fdt_strerror(sig_node));
	425	return 0;
	426	}
	427
	428	fdt_for_each_subnode(noffset, sig_blob, sig_node) {
	429	const char *required;
	430	int ret;
	431
1f47e2ac TR	432	required = fdt_getprop(sig_blob, noffset, FIT_KEY_REQUIRED,
1f47e2ac TR	433	NULL);
b983cc2d AT	434	if (!required \|\| strcmp(required, "conf"))
	435	continue;
	436	ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
	437	noffset);
	438	if (ret) {
	439	printf("Failed to verify required signature '%s'\n",
	440	fit_get_name(sig_blob, noffset, NULL));
	441	return ret;
	442	}
	443	}
	444
	445	return 0;
	446	}
	447
	448	int fit_config_verify(const void *fit, int conf_noffset)
	449	{
	450	return fit_config_verify_required_sigs(fit, conf_noffset,
	451	gd_fdt_blob());
	452	}