[J-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>
#include <asm/global_data.h>
DECLARE_GLOBAL_DATA_PTR;
#endif /* !USE_HOSTCC*/
#include <fdt_region.h>
#include <image.h>
#include <u-boot/rsa.h>
#include <u-boot/hash-checksum.h>

#define IMAGE_MAX_HASHED_NODES		100

/**
 * 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);

		/*
		 * We don't support this since libfdt considers names with the
		 * name root but different @ suffix to be equal
		 */
		if (strchr(name, '@')) {
			err_msg = "Node name contains @";
			goto error;
		}
		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 = "No 'signature' subnode found";
	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;
}

static int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
					   const void *sig_blob)
{
	const char *name = fit_get_name(fit, conf_noffset, NULL);
	int noffset;
	int sig_node;
	int verified = 0;
	int reqd_sigs = 0;
	bool reqd_policy_all = true;
	const char *reqd_mode;

	/*
	 * We don't support this since libfdt considers names with the
	 * name root but different @ suffix to be equal
	 */
	if (strchr(name, '@')) {
		printf("Configuration node '%s' contains '@'\n", name);
		return -EPERM;
	}

	/* 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;
	}

	/* Get required-mode policy property from DTB */
	reqd_mode = fdt_getprop(sig_blob, sig_node, "required-mode", NULL);
	if (reqd_mode && !strcmp(reqd_mode, "any"))
		reqd_policy_all = false;

	debug("%s: required-mode policy set to '%s'\n", __func__,
	      reqd_policy_all ? "all" : "any");

	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;

		reqd_sigs++;

		ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
					    noffset);
		if (ret) {
			if (reqd_policy_all) {
				printf("Failed to verify required signature '%s'\n",
				       fit_get_name(sig_blob, noffset, NULL));
				return ret;
			}
		} else {
			verified++;
			if (!reqd_policy_all)
				break;
		}
	}

	if (reqd_sigs && !verified) {
		printf("Failed to verify 'any' of the required signature(s)\n");
		return -EPERM;
	}

	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	12	#include <malloc.h>
401d1c4f	13	#include <asm/global_data.h>
b983cc2d AT	14	DECLARE_GLOBAL_DATA_PTR;
b983cc2d AT	15	#endif /* !USE_HOSTCC*/
64045a6a	16	#include <fdt_region.h>
b983cc2d AT	17	#include <image.h>
b983cc2d AT	18	#include <u-boot/rsa.h>
0bcb28df	19	#include <u-boot/hash-checksum.h>
b983cc2d AT	20
	21	#define IMAGE_MAX_HASHED_NODES 100
	22
b983cc2d AT	23	/**
	24	* fit_region_make_list() - Make a list of image regions
	25	*
	26	* Given a list of fdt_regions, create a list of image_regions. This is a
	27	* simple conversion routine since the FDT and image code use different
	28	* structures.
	29	*
	30	* @fit: FIT image
	31	* @fdt_regions: Pointer to FDT regions
	32	* @count: Number of FDT regions
	33	* @region: Pointer to image regions, which must hold @count records. If
	34	* region is NULL, then (except for an SPL build) the array will be
	35	* allocated.
	36	* @return: Pointer to image regions
	37	*/
	38	struct image_region fit_region_make_list(const void fit,
	39	struct fdt_region *fdt_regions,
	40	int count,
	41	struct image_region *region)
	42	{
	43	int i;
	44
	45	debug("Hash regions:\n");
	46	debug("%10s %10s\n", "Offset", "Size");
	47
	48	/*
	49	* Use malloc() except in SPL (to save code size). In SPL the caller
	50	* must allocate the array.
	51	*/
	52	#ifndef CONFIG_SPL_BUILD
	53	if (!region)
	54	region = calloc(sizeof(*region), count);
	55	#endif
	56	if (!region)
	57	return NULL;
	58	for (i = 0; i < count; i++) {
	59	debug("%10x %10x\n", fdt_regions[i].offset,
	60	fdt_regions[i].size);
	61	region[i].data = fit + fdt_regions[i].offset;
	62	region[i].size = fdt_regions[i].size;
	63	}
	64
	65	return region;
	66	}
	67
	68	static int fit_image_setup_verify(struct image_sign_info *info,
	69	const void *fit, int noffset,
	70	int required_keynode, char **err_msgp)
	71	{
	72	char *algo_name;
	73	const char *padding_name;
	74
	75	if (fdt_totalsize(fit) > CONFIG_FIT_SIGNATURE_MAX_SIZE) {
	76	*err_msgp = "Total size too large";
	77	return 1;
	78	}
	79
	80	if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
	81	*err_msgp = "Can't get hash algo property";
	82	return -1;
	83	}
	84
	85	padding_name = fdt_getprop(fit, noffset, "padding", NULL);
	86	if (!padding_name)
87	padding_name = RSA_DEFAULT_PADDING_NAME;
88
89	memset(info, '\0', sizeof(*info));
1f47e2ac	90	info->keyname = fdt_getprop(fit, noffset, FIT_KEY_HINT, NULL);
b983cc2d AT	91	info->fit = (void *)fit;
	92	info->node_offset = noffset;
	93	info->name = algo_name;
	94	info->checksum = image_get_checksum_algo(algo_name);
	95	info->crypto = image_get_crypto_algo(algo_name);
	96	info->padding = image_get_padding_algo(padding_name);
	97	info->fdt_blob = gd_fdt_blob();
	98	info->required_keynode = required_keynode;
	99	printf("%s:%s", algo_name, info->keyname);
	100
	101	if (!info->checksum \|\| !info->crypto \|\| !info->padding) {
	102	*err_msgp = "Unknown signature algorithm";
	103	return -1;
	104	}
	105
	106	return 0;
	107	}
	108
	109	int fit_image_check_sig(const void fit, int noffset, const void data,
	110	size_t size, int required_keynode, char **err_msgp)
	111	{
	112	struct image_sign_info info;
	113	struct image_region region;
	114	uint8_t *fit_value;
	115	int fit_value_len;
	116
	117	*err_msgp = NULL;
	118	if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
	119	err_msgp))
	120	return -1;
	121
	122	if (fit_image_hash_get_value(fit, noffset, &fit_value,
	123	&fit_value_len)) {
	124	*err_msgp = "Can't get hash value property";
	125	return -1;
	126	}
	127
	128	region.data = data;
	129	region.size = size;
	130
	131	if (info.crypto->verify(&info, &region, 1, fit_value, fit_value_len)) {
	132	*err_msgp = "Verification failed";
	133	return -1;
	134	}
	135
	136	return 0;
	137	}
	138
	139	static int fit_image_verify_sig(const void *fit, int image_noffset,
	140	const char *data, size_t size,
	141	const void *sig_blob, int sig_offset)
	142	{
	143	int noffset;
	144	char *err_msg = "";
	145	int verified = 0;
	146	int ret;
	147
	148	/* Process all hash subnodes of the component image node */
	149	fdt_for_each_subnode(noffset, fit, image_noffset) {
	150	const char *name = fit_get_name(fit, noffset, NULL);
	151
79af75f7 SG	152	/*
	153	* We don't support this since libfdt considers names with the
	154	* name root but different @ suffix to be equal
	155	*/
	156	if (strchr(name, '@')) {
	157	err_msg = "Node name contains @";
	158	goto error;
	159	}
b983cc2d AT	160	if (!strncmp(name, FIT_SIG_NODENAME,
	161	strlen(FIT_SIG_NODENAME))) {
	162	ret = fit_image_check_sig(fit, noffset, data,
	163	size, -1, &err_msg);
	164	if (ret) {
	165	puts("- ");
	166	} else {
	167	puts("+ ");
	168	verified = 1;
	169	break;
	170	}
	171	}
	172	}
	173
	174	if (noffset == -FDT_ERR_TRUNCATED \|\| noffset == -FDT_ERR_BADSTRUCTURE) {
	175	err_msg = "Corrupted or truncated tree";
	176	goto error;
	177	}
	178
	179	return verified ? 0 : -EPERM;
	180
	181	error:
	182	printf(" error!\n%s for '%s' hash node in '%s' image node\n",
	183	err_msg, fit_get_name(fit, noffset, NULL),
	184	fit_get_name(fit, image_noffset, NULL));
	185	return -1;
	186	}
	187
	188	int fit_image_verify_required_sigs(const void *fit, int image_noffset,
	189	const char *data, size_t size,
	190	const void sig_blob, int no_sigsp)
	191	{
	192	int verify_count = 0;
	193	int noffset;
	194	int sig_node;
	195
	196	/* Work out what we need to verify */
	197	*no_sigsp = 1;
	198	sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
	199	if (sig_node < 0) {
	200	debug("%s: No signature node found: %s\n", __func__,
	201	fdt_strerror(sig_node));
	202	return 0;
	203	}
	204
	205	fdt_for_each_subnode(noffset, sig_blob, sig_node) {
	206	const char *required;
	207	int ret;
	208
1f47e2ac TR	209	required = fdt_getprop(sig_blob, noffset, FIT_KEY_REQUIRED,
1f47e2ac TR	210	NULL);
b983cc2d AT	211	if (!required \|\| strcmp(required, "image"))
	212	continue;
	213	ret = fit_image_verify_sig(fit, image_noffset, data, size,
	214	sig_blob, noffset);
	215	if (ret) {
	216	printf("Failed to verify required signature '%s'\n",
	217	fit_get_name(sig_blob, noffset, NULL));
	218	return ret;
	219	}
	220	verify_count++;
	221	}
	222
	223	if (verify_count)
	224	*no_sigsp = 0;
	225
	226	return 0;
	227	}
	228
1f47e2ac TR	229	/**
	230	* fit_config_check_sig() - Check the signature of a config
	231	*
	232	* @fit: FIT to check
	233	* @noffset: Offset of configuration node (e.g. /configurations/conf-1)
	234	* @required_keynode: Offset in the control FDT of the required key node,
	235	* if any. If this is given, then the configuration wil not
	236	* pass verification unless that key is used. If this is
	237	* -1 then any signature will do.
	238	* @conf_noffset: Offset of the configuration subnode being checked (e.g.
	239	* /configurations/conf-1/kernel)
	240	* @err_msgp: In the event of an error, this will be pointed to a
	241	* help error string to display to the user.
	242	* @return 0 if all verified ok, <0 on error
	243	*/
	244	static int fit_config_check_sig(const void *fit, int noffset,
	245	int required_keynode, int conf_noffset,
	246	char **err_msgp)
b983cc2d	247	{
c522949a	248	char * const exc_prop[] = {"data", "data-size", "data-position"};
b983cc2d AT	249	const char prop, end, *name;
	250	struct image_sign_info info;
	251	const uint32_t *strings;
1f47e2ac	252	const char *config_name;
b983cc2d AT	253	uint8_t *fit_value;
b983cc2d AT	254	int fit_value_len;
1f47e2ac	255	bool found_config;
b983cc2d AT	256	int max_regions;
	257	int i, prop_len;
	258	char path[200];
	259	int count;
	260
1f47e2ac	261	config_name = fit_get_name(fit, conf_noffset, NULL);
b983cc2d AT	262	debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(),
	263	fit_get_name(fit, noffset, NULL),
	264	fit_get_name(gd_fdt_blob(), required_keynode, NULL));
	265	*err_msgp = NULL;
	266	if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
	267	err_msgp))
	268	return -1;
	269
	270	if (fit_image_hash_get_value(fit, noffset, &fit_value,
	271	&fit_value_len)) {
	272	*err_msgp = "Can't get hash value property";
	273	return -1;
	274	}
	275
	276	/* Count the number of strings in the property */
	277	prop = fdt_getprop(fit, noffset, "hashed-nodes", &prop_len);
	278	end = prop ? prop + prop_len : prop;
	279	for (name = prop, count = 0; name < end; name++)
	280	if (!*name)
	281	count++;
	282	if (!count) {
	283	*err_msgp = "Can't get hashed-nodes property";
	284	return -1;
	285	}
	286
	287	if (prop && prop_len > 0 && prop[prop_len - 1] != '\0') {
	288	*err_msgp = "hashed-nodes property must be null-terminated";
	289	return -1;
	290	}
	291
	292	/* Add a sanity check here since we are using the stack */
	293	if (count > IMAGE_MAX_HASHED_NODES) {
	294	*err_msgp = "Number of hashed nodes exceeds maximum";
	295	return -1;
	296	}
	297
	298	/* Create a list of node names from those strings */
	299	char *node_inc[count];
	300
	301	debug("Hash nodes (%d):\n", count);
1f47e2ac	302	found_config = false;
b983cc2d AT	303	for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
	304	debug(" '%s'\n", name);
	305	node_inc[i] = (char *)name;
1f47e2ac TR	306	if (!strncmp(FIT_CONFS_PATH, name, strlen(FIT_CONFS_PATH)) &&
	307	name[sizeof(FIT_CONFS_PATH) - 1] == '/' &&
	308	!strcmp(name + sizeof(FIT_CONFS_PATH), config_name)) {
	309	debug(" (found config node %s)", config_name);
	310	found_config = true;
	311	}
	312	}
	313	if (!found_config) {
	314	*err_msgp = "Selected config not in hashed nodes";
	315	return -1;
b983cc2d AT	316	}
	317
	318	/*
	319	* Each node can generate one region for each sub-node. Allow for
	320	* 7 sub-nodes (hash-1, signature-1, etc.) and some extra.
	321	*/
	322	max_regions = 20 + count * 7;
	323	struct fdt_region fdt_regions[max_regions];
	324
	325	/* Get a list of regions to hash */
	326	count = fdt_find_regions(fit, node_inc, count,
	327	exc_prop, ARRAY_SIZE(exc_prop),
	328	fdt_regions, max_regions - 1,
	329	path, sizeof(path), 0);
	330	if (count < 0) {
	331	*err_msgp = "Failed to hash configuration";
	332	return -1;
	333	}
	334	if (count == 0) {
	335	*err_msgp = "No data to hash";
	336	return -1;
	337	}
	338	if (count >= max_regions - 1) {
	339	*err_msgp = "Too many hash regions";
	340	return -1;
	341	}
	342
	343	/* Add the strings */
	344	strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
	345	if (strings) {
	346	/*
	347	* The strings region offset must be a static 0x0.
	348	* This is set in tool/image-host.c
	349	*/
	350	fdt_regions[count].offset = fdt_off_dt_strings(fit);
	351	fdt_regions[count].size = fdt32_to_cpu(strings[1]);
	352	count++;
	353	}
	354
	355	/* Allocate the region list on the stack */
	356	struct image_region region[count];
	357
	358	fit_region_make_list(fit, fdt_regions, count, region);
	359	if (info.crypto->verify(&info, region, count, fit_value,
	360	fit_value_len)) {
	361	*err_msgp = "Verification failed";
	362	return -1;
	363	}
	364
	365	return 0;
	366	}
	367
	368	static int fit_config_verify_sig(const void *fit, int conf_noffset,
	369	const void *sig_blob, int sig_offset)
	370	{
	371	int noffset;
76c78a54	372	char *err_msg = "No 'signature' subnode found";
b983cc2d AT	373	int verified = 0;
	374	int ret;
	375
	376	/* Process all hash subnodes of the component conf node */
	377	fdt_for_each_subnode(noffset, fit, conf_noffset) {
	378	const char *name = fit_get_name(fit, noffset, NULL);
	379
	380	if (!strncmp(name, FIT_SIG_NODENAME,
	381	strlen(FIT_SIG_NODENAME))) {
	382	ret = fit_config_check_sig(fit, noffset, sig_offset,
1f47e2ac	383	conf_noffset, &err_msg);
b983cc2d AT	384	if (ret) {
	385	puts("- ");
	386	} else {
	387	puts("+ ");
	388	verified = 1;
	389	break;
	390	}
	391	}
	392	}
	393
	394	if (noffset == -FDT_ERR_TRUNCATED \|\| noffset == -FDT_ERR_BADSTRUCTURE) {
	395	err_msg = "Corrupted or truncated tree";
	396	goto error;
	397	}
	398
1f47e2ac TR	399	if (verified)
1f47e2ac TR	400	return 0;
b983cc2d AT	401
	402	error:
	403	printf(" error!\n%s for '%s' hash node in '%s' config node\n",
	404	err_msg, fit_get_name(fit, noffset, NULL),
	405	fit_get_name(fit, conf_noffset, NULL));
1f47e2ac	406	return -EPERM;
b983cc2d AT	407	}
b983cc2d AT	408
79af75f7 SG	409	static int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
79af75f7 SG	410	const void *sig_blob)
b983cc2d	411	{
79af75f7	412	const char *name = fit_get_name(fit, conf_noffset, NULL);
b983cc2d AT	413	int noffset;
b983cc2d AT	414	int sig_node;
182eeefc TA	415	int verified = 0;
	416	int reqd_sigs = 0;
	417	bool reqd_policy_all = true;
	418	const char *reqd_mode;
b983cc2d	419
79af75f7 SG	420	/*
	421	* We don't support this since libfdt considers names with the
	422	* name root but different @ suffix to be equal
	423	*/
	424	if (strchr(name, '@')) {
	425	printf("Configuration node '%s' contains '@'\n", name);
	426	return -EPERM;
	427	}
	428
b983cc2d AT	429	/* Work out what we need to verify */
	430	sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
	431	if (sig_node < 0) {
	432	debug("%s: No signature node found: %s\n", __func__,
	433	fdt_strerror(sig_node));
	434	return 0;
	435	}
	436
182eeefc TA	437	/* Get required-mode policy property from DTB */
	438	reqd_mode = fdt_getprop(sig_blob, sig_node, "required-mode", NULL);
	439	if (reqd_mode && !strcmp(reqd_mode, "any"))
	440	reqd_policy_all = false;
	441
	442	debug("%s: required-mode policy set to '%s'\n", __func__,
	443	reqd_policy_all ? "all" : "any");
	444
b983cc2d AT	445	fdt_for_each_subnode(noffset, sig_blob, sig_node) {
	446	const char *required;
	447	int ret;
	448
1f47e2ac TR	449	required = fdt_getprop(sig_blob, noffset, FIT_KEY_REQUIRED,
1f47e2ac TR	450	NULL);
b983cc2d AT	451	if (!required \|\| strcmp(required, "conf"))
b983cc2d AT	452	continue;
182eeefc TA	453
	454	reqd_sigs++;
	455
b983cc2d AT	456	ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
	457	noffset);
	458	if (ret) {
182eeefc TA	459	if (reqd_policy_all) {
	460	printf("Failed to verify required signature '%s'\n",
	461	fit_get_name(sig_blob, noffset, NULL));
	462	return ret;
	463	}
	464	} else {
	465	verified++;
	466	if (!reqd_policy_all)
	467	break;
b983cc2d AT	468	}
	469	}
	470
182eeefc TA	471	if (reqd_sigs && !verified) {
	472	printf("Failed to verify 'any' of the required signature(s)\n");
	473	return -EPERM;
	474	}
	475
b983cc2d AT	476	return 0;
	477	}
	478
	479	int fit_config_verify(const void *fit, int conf_noffset)
	480	{
	481	return fit_config_verify_required_sigs(fit, conf_noffset,
	482	gd_fdt_blob());
	483	}