tools/image-host.c

   1 /*
   2  * Copyright (c) 2013, Google Inc.
   3  *
   4  * (C) Copyright 2008 Semihalf
   5  *
   6  * (C) Copyright 2000-2006
   7  * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
   8  *
   9  * See file CREDITS for list of people who contributed to this
  10  * project.
  11  *
  12  * This program is free software; you can redistribute it and/or
  13  * modify it under the terms of the GNU General Public License as
  14  * published by the Free Software Foundation; either version 2 of
  15  * the License, or (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  25  * MA 02111-1307 USA
  26  */
  27
  28 #include "mkimage.h"
  29 #include <image.h>
  30 #include <version.h>
  31
  32 /**
  33  * fit_set_hash_value - set hash value in requested has node
  34  * @fit: pointer to the FIT format image header
  35  * @noffset: hash node offset
  36  * @value: hash value to be set
  37  * @value_len: hash value length
  38  *
  39  * fit_set_hash_value() attempts to set hash value in a node at offset
  40  * given and returns operation status to the caller.
  41  *
  42  * returns
  43  *     0, on success
  44  *     -1, on failure
  45  */
  46 static int fit_set_hash_value(void *fit, int noffset, uint8_t *value,
  47                                 int value_len)
  48 {
  49         int ret;
  50
  51         ret = fdt_setprop(fit, noffset, FIT_VALUE_PROP, value, value_len);
  52         if (ret) {
  53                 printf("Can't set hash '%s' property for '%s' node(%s)\n",
  54                        FIT_VALUE_PROP, fit_get_name(fit, noffset, NULL),
  55                        fdt_strerror(ret));
  56                 return -1;
  57         }
  58
  59         return 0;
  60 }
  61
  62 /**
  63  * fit_image_process_hash - Process a single subnode of the images/ node
  64  *
  65  * Check each subnode and process accordingly. For hash nodes we generate
  66  * a hash of the supplised data and store it in the node.
  67  *
  68  * @fit:        pointer to the FIT format image header
  69  * @image_name: name of image being processes (used to display errors)
  70  * @noffset:    subnode offset
  71  * @data:       data to process
  72  * @size:       size of data in bytes
  73  * @return 0 if ok, -1 on error
  74  */
  75 static int fit_image_process_hash(void *fit, const char *image_name,
  76                 int noffset, const void *data, size_t size)
  77 {
  78         uint8_t value[FIT_MAX_HASH_LEN];
  79         const char *node_name;
  80         int value_len;
  81         char *algo;
  82
  83         node_name = fit_get_name(fit, noffset, NULL);
  84
  85         if (fit_image_hash_get_algo(fit, noffset, &algo)) {
  86                 printf("Can't get hash algo property for '%s' hash node in '%s' image node\n",
  87                        node_name, image_name);
  88                 return -1;
  89         }
  90
  91         if (calculate_hash(data, size, algo, value, &value_len)) {
  92                 printf("Unsupported hash algorithm (%s) for '%s' hash node in '%s' image node\n",
  93                        algo, node_name, image_name);
  94                 return -1;
  95         }
  96
  97         if (fit_set_hash_value(fit, noffset, value, value_len)) {
  98                 printf("Can't set hash value for '%s' hash node in '%s' image node\n",
  99                        node_name, image_name);
 100                 return -1;
 101         }
 102
 103         return 0;
 104 }
 105
 106 /**
 107  * fit_image_write_sig() - write the signature to a FIT
 108  *
 109  * This writes the signature and signer data to the FIT.
 110  *
 111  * @fit: pointer to the FIT format image header
 112  * @noffset: hash node offset
 113  * @value: signature value to be set
 114  * @value_len: signature value length
 115  * @comment: Text comment to write (NULL for none)
 116  *
 117  * returns
 118  *     0, on success
 119  *     -FDT_ERR_..., on failure
 120  */
 121 static int fit_image_write_sig(void *fit, int noffset, uint8_t *value,
 122                 int value_len, const char *comment, const char *region_prop,
 123                 int region_proplen)
 124 {
 125         int string_size;
 126         int ret;
 127
 128         /*
 129          * Get the current string size, before we update the FIT and add
 130          * more
 131          */
 132         string_size = fdt_size_dt_strings(fit);
 133
 134         ret = fdt_setprop(fit, noffset, FIT_VALUE_PROP, value, value_len);
 135         if (!ret) {
 136                 ret = fdt_setprop_string(fit, noffset, "signer-name",
 137                                          "mkimage");
 138         }
 139         if (!ret) {
 140                 ret = fdt_setprop_string(fit, noffset, "signer-version",
 141                                   PLAIN_VERSION);
 142         }
 143         if (comment && !ret)
 144                 ret = fdt_setprop_string(fit, noffset, "comment", comment);
 145         if (!ret)
 146                 ret = fit_set_timestamp(fit, noffset, time(NULL));
 147         if (region_prop && !ret) {
 148                 uint32_t strdata[2];
 149
 150                 ret = fdt_setprop(fit, noffset, "hashed-nodes",
 151                                    region_prop, region_proplen);
 152                 strdata[0] = 0;
 153                 strdata[1] = cpu_to_fdt32(string_size);
 154                 if (!ret) {
 155                         ret = fdt_setprop(fit, noffset, "hashed-strings",
 156                                           strdata, sizeof(strdata));
 157                 }
 158         }
 159
 160         return ret;
 161 }
 162
 163 static int fit_image_setup_sig(struct image_sign_info *info,
 164                 const char *keydir, void *fit, const char *image_name,
 165                 int noffset, const char *require_keys)
 166 {
 167         const char *node_name;
 168         char *algo_name;
 169
 170         node_name = fit_get_name(fit, noffset, NULL);
 171         if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
 172                 printf("Can't get algo property for '%s' signature node in '%s' image node\n",
 173                        node_name, image_name);
 174                 return -1;
 175         }
 176
 177         memset(info, '\0', sizeof(*info));
 178         info->keydir = keydir;
 179         info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
 180         info->fit = fit;
 181         info->node_offset = noffset;
 182         info->algo = image_get_sig_algo(algo_name);
 183         info->require_keys = require_keys;
 184         if (!info->algo) {
 185                 printf("Unsupported signature algorithm (%s) for '%s' signature node in '%s' image node\n",
 186                        algo_name, node_name, image_name);
 187                 return -1;
 188         }
 189
 190         return 0;
 191 }
 192
 193 /**
 194  * fit_image_process_sig- Process a single subnode of the images/ node
 195  *
 196  * Check each subnode and process accordingly. For signature nodes we
 197  * generate a signed hash of the supplised data and store it in the node.
 198  *
 199  * @keydir:     Directory containing keys to use for signing
 200  * @keydest:    Destination FDT blob to write public keys into
 201  * @fit:        pointer to the FIT format image header
 202  * @image_name: name of image being processes (used to display errors)
 203  * @noffset:    subnode offset
 204  * @data:       data to process
 205  * @size:       size of data in bytes
 206  * @comment:    Comment to add to signature nodes
 207  * @require_keys: Mark all keys as 'required'
 208  * @return 0 if ok, -1 on error
 209  */
 210 static int fit_image_process_sig(const char *keydir, void *keydest,
 211                 void *fit, const char *image_name,
 212                 int noffset, const void *data, size_t size,
 213                 const char *comment, int require_keys)
 214 {
 215         struct image_sign_info info;
 216         struct image_region region;
 217         const char *node_name;
 218         uint8_t *value;
 219         uint value_len;
 220         int ret;
 221
 222         if (fit_image_setup_sig(&info, keydir, fit, image_name, noffset,
 223                                 require_keys ? "image" : NULL))
 224                 return -1;
 225
 226         node_name = fit_get_name(fit, noffset, NULL);
 227         region.data = data;
 228         region.size = size;
 229         ret = info.algo->sign(&info, &region, 1, &value, &value_len);
 230         if (ret) {
 231                 printf("Failed to sign '%s' signature node in '%s' image node: %d\n",
 232                        node_name, image_name, ret);
 233
 234                 /* We allow keys to be missing */
 235                 if (ret == -ENOENT)
 236                         return 0;
 237                 return -1;
 238         }
 239
 240         ret = fit_image_write_sig(fit, noffset, value, value_len, comment,
 241                         NULL, 0);
 242         if (ret) {
 243                 printf("Can't write signature for '%s' signature node in '%s' image node: %s\n",
 244                        node_name, image_name, fdt_strerror(ret));
 245                 return -1;
 246         }
 247         free(value);
 248
 249         /* Get keyname again, as FDT has changed and invalidated our pointer */
 250         info.keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
 251
 252         /* Write the public key into the supplied FDT file */
 253         if (keydest && info.algo->add_verify_data(&info, keydest)) {
 254                 printf("Failed to add verification data for '%s' signature node in '%s' image node\n",
 255                        node_name, image_name);
 256                 return -1;
 257         }
 258
 259         return 0;
 260 }
 261
 262 /**
 263  * fit_image_add_verification_data() - calculate/set verig. data for image node
 264  *
 265  * This adds hash and signature values for an component image node.
 266  *
 267  * All existing hash subnodes are checked, if algorithm property is set to
 268  * one of the supported hash algorithms, hash value is computed and
 269  * corresponding hash node property is set, for example:
 270  *
 271  * Input component image node structure:
 272  *
 273  * o image@1 (at image_noffset)
 274  *   | - data = [binary data]
 275  *   o hash@1
 276  *     |- algo = "sha1"
 277  *
 278  * Output component image node structure:
 279  *
 280  * o image@1 (at image_noffset)
 281  *   | - data = [binary data]
 282  *   o hash@1
 283  *     |- algo = "sha1"
 284  *     |- value = sha1(data)
 285  *
 286  * For signature details, please see doc/uImage.FIT/signature.txt
 287  *
 288  * @keydir      Directory containing *.key and *.crt files (or NULL)
 289  * @keydest     FDT Blob to write public keys into (NULL if none)
 290  * @fit:        Pointer to the FIT format image header
 291  * @image_noffset: Requested component image node
 292  * @comment:    Comment to add to signature nodes
 293  * @require_keys: Mark all keys as 'required'
 294  * @return: 0 on success, <0 on failure
 295  */
 296 int fit_image_add_verification_data(const char *keydir, void *keydest,
 297                 void *fit, int image_noffset, const char *comment,
 298                 int require_keys)
 299 {
 300         const char *image_name;
 301         const void *data;
 302         size_t size;
 303         int noffset;
 304
 305         /* Get image data and data length */
 306         if (fit_image_get_data(fit, image_noffset, &data, &size)) {
 307                 printf("Can't get image data/size\n");
 308                 return -1;
 309         }
 310
 311         image_name = fit_get_name(fit, image_noffset, NULL);
 312
 313         /* Process all hash subnodes of the component image node */
 314         for (noffset = fdt_first_subnode(fit, image_noffset);
 315              noffset >= 0;
 316              noffset = fdt_next_subnode(fit, noffset)) {
 317                 const char *node_name;
 318                 int ret = 0;
 319
 320                 /*
 321                  * Check subnode name, must be equal to "hash" or "signature".
 322                  * Multiple hash nodes require unique unit node
 323                  * names, e.g. hash@1, hash@2, signature@1, etc.
 324                  */
 325                 node_name = fit_get_name(fit, noffset, NULL);
 326                 if (!strncmp(node_name, FIT_HASH_NODENAME,
 327                              strlen(FIT_HASH_NODENAME))) {
 328                         ret = fit_image_process_hash(fit, image_name, noffset,
 329                                                 data, size);
 330                 } else if (IMAGE_ENABLE_SIGN && keydir &&
 331                            !strncmp(node_name, FIT_SIG_NODENAME,
 332                                 strlen(FIT_SIG_NODENAME))) {
 333                         ret = fit_image_process_sig(keydir, keydest,
 334                                 fit, image_name, noffset, data, size,
 335                                 comment, require_keys);
 336                 }
 337                 if (ret)
 338                         return -1;
 339         }
 340
 341         return 0;
 342 }
 343
 344 struct strlist {
 345         int count;
 346         char **strings;
 347 };
 348
 349 static void strlist_init(struct strlist *list)
 350 {
 351         memset(list, '\0', sizeof(*list));
 352 }
 353
 354 static void strlist_free(struct strlist *list)
 355 {
 356         int i;
 357
 358         for (i = 0; i < list->count; i++)
 359                 free(list->strings[i]);
 360         free(list->strings);
 361 }
 362
 363 static int strlist_add(struct strlist *list, const char *str)
 364 {
 365         char *dup;
 366
 367         dup = strdup(str);
 368         list->strings = realloc(list->strings,
 369                                 (list->count + 1) * sizeof(char *));
 370         if (!list || !str)
 371                 return -1;
 372         list->strings[list->count++] = dup;
 373
 374         return 0;
 375 }
 376
 377 static const char *fit_config_get_image_list(void *fit, int noffset,
 378                 int *lenp, int *allow_missingp)
 379 {
 380         static const char default_list[] = FIT_KERNEL_PROP "\0"
 381                         FIT_FDT_PROP;
 382         const char *prop;
 383
 384         /* If there is an "image" property, use that */
 385         prop = fdt_getprop(fit, noffset, "sign-images", lenp);
 386         if (prop) {
 387                 *allow_missingp = 0;
 388                 return *lenp ? prop : NULL;
 389         }
 390
 391         /* Default image list */
 392         *allow_missingp = 1;
 393         *lenp = sizeof(default_list);
 394
 395         return default_list;
 396 }
 397
 398 static int fit_config_get_hash_list(void *fit, int conf_noffset,
 399                                     int sig_offset, struct strlist *node_inc)
 400 {
 401         int allow_missing;
 402         const char *prop, *iname, *end;
 403         const char *conf_name, *sig_name;
 404         char name[200], path[200];
 405         int image_count;
 406         int ret, len;
 407
 408         conf_name = fit_get_name(fit, conf_noffset, NULL);
 409         sig_name = fit_get_name(fit, sig_offset, NULL);
 410
 411         /*
 412          * Build a list of nodes we need to hash. We always need the root
 413          * node and the configuration.
 414          */
 415         strlist_init(node_inc);
 416         snprintf(name, sizeof(name), "%s/%s", FIT_CONFS_PATH, conf_name);
 417         if (strlist_add(node_inc, "/") ||
 418             strlist_add(node_inc, name))
 419                 goto err_mem;
 420
 421         /* Get a list of images that we intend to sign */
 422         prop = fit_config_get_image_list(fit, conf_noffset, &len,
 423                                         &allow_missing);
 424         if (!prop)
 425                 return 0;
 426
 427         /* Locate the images */
 428         end = prop + len;
 429         image_count = 0;
 430         for (iname = prop; iname < end; iname += strlen(iname) + 1) {
 431                 int noffset;
 432                 int image_noffset;
 433                 int hash_count;
 434
 435                 image_noffset = fit_conf_get_prop_node(fit, conf_noffset,
 436                                                        iname);
 437                 if (image_noffset < 0) {
 438                         printf("Failed to find image '%s' in  configuration '%s/%s'\n",
 439                                iname, conf_name, sig_name);
 440                         if (allow_missing)
 441                                 continue;
 442
 443                         return -ENOENT;
 444                 }
 445
 446                 ret = fdt_get_path(fit, image_noffset, path, sizeof(path));
 447                 if (ret < 0)
 448                         goto err_path;
 449                 if (strlist_add(node_inc, path))
 450                         goto err_mem;
 451
 452                 snprintf(name, sizeof(name), "%s/%s", FIT_CONFS_PATH,
 453                          conf_name);
 454
 455                 /* Add all this image's hashes */
 456                 hash_count = 0;
 457                 for (noffset = fdt_first_subnode(fit, image_noffset);
 458                      noffset >= 0;
 459                      noffset = fdt_next_subnode(fit, noffset)) {
 460                         const char *name = fit_get_name(fit, noffset, NULL);
 461
 462                         if (strncmp(name, FIT_HASH_NODENAME,
 463                                     strlen(FIT_HASH_NODENAME)))
 464                                 continue;
 465                         ret = fdt_get_path(fit, noffset, path, sizeof(path));
 466                         if (ret < 0)
 467                                 goto err_path;
 468                         if (strlist_add(node_inc, path))
 469                                 goto err_mem;
 470                         hash_count++;
 471                 }
 472
 473                 if (!hash_count) {
 474                         printf("Failed to find any hash nodes in configuration '%s/%s' image '%s' - without these it is not possible to verify this image\n",
 475                                conf_name, sig_name, iname);
 476                         return -ENOMSG;
 477                 }
 478
 479                 image_count++;
 480         }
 481
 482         if (!image_count) {
 483                 printf("Failed to find any images for configuration '%s/%s'\n",
 484                        conf_name, sig_name);
 485                 return -ENOMSG;
 486         }
 487
 488         return 0;
 489
 490 err_mem:
 491         printf("Out of memory processing configuration '%s/%s'\n", conf_name,
 492                sig_name);
 493         return -ENOMEM;
 494
 495 err_path:
 496         printf("Failed to get path for image '%s' in configuration '%s/%s': %s\n",
 497                iname, conf_name, sig_name, fdt_strerror(ret));
 498         return -ENOENT;
 499 }
 500
 501 static int fit_config_get_data(void *fit, int conf_noffset, int noffset,
 502                 struct image_region **regionp, int *region_countp,
 503                 char **region_propp, int *region_proplen)
 504 {
 505         char * const exc_prop[] = {"data"};
 506         struct strlist node_inc;
 507         struct image_region *region;
 508         struct fdt_region fdt_regions[100];
 509         const char *conf_name, *sig_name;
 510         char path[200];
 511         int count, i;
 512         char *region_prop;
 513         int ret, len;
 514
 515         conf_name = fit_get_name(fit, conf_noffset, NULL);
 516         sig_name = fit_get_name(fit, conf_noffset, NULL);
 517         debug("%s: conf='%s', sig='%s'\n", __func__, conf_name, sig_name);
 518
 519         /* Get a list of nodes we want to hash */
 520         ret = fit_config_get_hash_list(fit, conf_noffset, noffset, &node_inc);
 521         if (ret)
 522                 return ret;
 523
 524         /* Get a list of regions to hash */
 525         count = fdt_find_regions(fit, node_inc.strings, node_inc.count,
 526                         exc_prop, ARRAY_SIZE(exc_prop),
 527                         fdt_regions, ARRAY_SIZE(fdt_regions),
 528                         path, sizeof(path), 1);
 529         if (count < 0) {
 530                 printf("Failed to hash configuration '%s/%s': %s\n", conf_name,
 531                        sig_name, fdt_strerror(ret));
 532                 return -EIO;
 533         }
 534         if (count == 0) {
 535                 printf("No data to hash for configuration '%s/%s': %s\n",
 536                        conf_name, sig_name, fdt_strerror(ret));
 537                 return -EINVAL;
 538         }
 539
 540         /* Build our list of data blocks */
 541         region = fit_region_make_list(fit, fdt_regions, count, NULL);
 542         if (!region) {
 543                 printf("Out of memory hashing configuration '%s/%s'\n",
 544                        conf_name, sig_name);
 545                 return -ENOMEM;
 546         }
 547
 548         /* Create a list of all hashed properties */
 549         debug("Hash nodes:\n");
 550         for (i = len = 0; i < node_inc.count; i++) {
 551                 debug("   %s\n", node_inc.strings[i]);
 552                 len += strlen(node_inc.strings[i]) + 1;
 553         }
 554         region_prop = malloc(len);
 555         if (!region_prop) {
 556                 printf("Out of memory setting up regions for configuration '%s/%s'\n",
 557                        conf_name, sig_name);
 558                 return -ENOMEM;
 559         }
 560         for (i = len = 0; i < node_inc.count;
 561              len += strlen(node_inc.strings[i]) + 1, i++)
 562                 strcpy(region_prop + len, node_inc.strings[i]);
 563         strlist_free(&node_inc);
 564
 565         *region_countp = count;
 566         *regionp = region;
 567         *region_propp = region_prop;
 568         *region_proplen = len;
 569
 570         return 0;
 571 }
 572
 573 static int fit_config_process_sig(const char *keydir, void *keydest,
 574                 void *fit, const char *conf_name, int conf_noffset,
 575                 int noffset, const char *comment, int require_keys)
 576 {
 577         struct image_sign_info info;
 578         const char *node_name;
 579         struct image_region *region;
 580         char *region_prop;
 581         int region_proplen;
 582         int region_count;
 583         uint8_t *value;
 584         uint value_len;
 585         int ret;
 586
 587         node_name = fit_get_name(fit, noffset, NULL);
 588         if (fit_config_get_data(fit, conf_noffset, noffset, &region,
 589                                 &region_count, &region_prop, &region_proplen))
 590                 return -1;
 591
 592         if (fit_image_setup_sig(&info, keydir, fit, conf_name, noffset,
 593                                 require_keys ? "conf" : NULL))
 594                 return -1;
 595
 596         ret = info.algo->sign(&info, region, region_count, &value, &value_len);
 597         free(region);
 598         if (ret) {
 599                 printf("Failed to sign '%s' signature node in '%s' conf node\n",
 600                        node_name, conf_name);
 601
 602                 /* We allow keys to be missing */
 603                 if (ret == -ENOENT)
 604                         return 0;
 605                 return -1;
 606         }
 607
 608         if (fit_image_write_sig(fit, noffset, value, value_len, comment,
 609                                 region_prop, region_proplen)) {
 610                 printf("Can't write signature for '%s' signature node in '%s' conf node\n",
 611                        node_name, conf_name);
 612                 return -1;
 613         }
 614         free(value);
 615         free(region_prop);
 616
 617         /* Get keyname again, as FDT has changed and invalidated our pointer */
 618         info.keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL);
 619
 620         /* Write the public key into the supplied FDT file */
 621         if (keydest && info.algo->add_verify_data(&info, keydest)) {
 622                 printf("Failed to add verification data for '%s' signature node in '%s' image node\n",
 623                        node_name, conf_name);
 624                 return -1;
 625         }
 626
 627         return 0;
 628 }
 629
 630 static int fit_config_add_verification_data(const char *keydir, void *keydest,
 631                 void *fit, int conf_noffset, const char *comment,
 632                 int require_keys)
 633 {
 634         const char *conf_name;
 635         int noffset;
 636
 637         conf_name = fit_get_name(fit, conf_noffset, NULL);
 638
 639         /* Process all hash subnodes of the configuration node */
 640         for (noffset = fdt_first_subnode(fit, conf_noffset);
 641              noffset >= 0;
 642              noffset = fdt_next_subnode(fit, noffset)) {
 643                 const char *node_name;
 644                 int ret = 0;
 645
 646                 node_name = fit_get_name(fit, noffset, NULL);
 647                 if (!strncmp(node_name, FIT_SIG_NODENAME,
 648                              strlen(FIT_SIG_NODENAME))) {
 649                         ret = fit_config_process_sig(keydir, keydest,
 650                                 fit, conf_name, conf_noffset, noffset, comment,
 651                                 require_keys);
 652                 }
 653                 if (ret)
 654                         return ret;
 655         }
 656
 657         return 0;
 658 }
 659
 660 int fit_add_verification_data(const char *keydir, void *keydest, void *fit,
 661                               const char *comment, int require_keys)
 662 {
 663         int images_noffset, confs_noffset;
 664         int noffset;
 665         int ret;
 666
 667         /* Find images parent node offset */
 668         images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH);
 669         if (images_noffset < 0) {
 670                 printf("Can't find images parent node '%s' (%s)\n",
 671                        FIT_IMAGES_PATH, fdt_strerror(images_noffset));
 672                 return images_noffset;
 673         }
 674
 675         /* Process its subnodes, print out component images details */
 676         for (noffset = fdt_first_subnode(fit, images_noffset);
 677              noffset >= 0;
 678              noffset = fdt_next_subnode(fit, noffset)) {
 679                 /*
 680                  * Direct child node of the images parent node,
 681                  * i.e. component image node.
 682                  */
 683                 ret = fit_image_add_verification_data(keydir, keydest,
 684                                 fit, noffset, comment, require_keys);
 685                 if (ret)
 686                         return ret;
 687         }
 688
 689         /* If there are no keys, we can't sign configurations */
 690         if (!IMAGE_ENABLE_SIGN || !keydir)
 691                 return 0;
 692
 693         /* Find configurations parent node offset */
 694         confs_noffset = fdt_path_offset(fit, FIT_CONFS_PATH);
 695         if (confs_noffset < 0) {
 696                 printf("Can't find images parent node '%s' (%s)\n",
 697                        FIT_IMAGES_PATH, fdt_strerror(confs_noffset));
 698                 return -ENOENT;
 699         }
 700
 701         /* Process its subnodes, print out component images details */
 702         for (noffset = fdt_first_subnode(fit, confs_noffset);
 703              noffset >= 0;
 704              noffset = fdt_next_subnode(fit, noffset)) {
 705                 ret = fit_config_add_verification_data(keydir, keydest,
 706                                                        fit, noffset, comment,
 707                                                        require_keys);
 708                 if (ret)
 709                         return ret;
 710         }
 711
 712         return 0;
 713 }