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1 | // SPDX-License-Identifier: GPL-2.0+ | |
2 | /* | |
3 | * Copyright (c) 2013, Google Inc. | |
4 | * | |
5 | * (C) Copyright 2008 Semihalf | |
6 | * | |
7 | * (C) Copyright 2000-2006 | |
8 | * Wolfgang Denk, DENX Software Engineering, wd@denx.de. | |
9 | */ | |
10 | ||
11 | #include "mkimage.h" | |
12 | #include <bootm.h> | |
13 | #include <image.h> | |
14 | #include <version.h> | |
15 | ||
16 | /** | |
17 | * fit_set_hash_value - set hash value in requested has node | |
18 | * @fit: pointer to the FIT format image header | |
19 | * @noffset: hash node offset | |
20 | * @value: hash value to be set | |
21 | * @value_len: hash value length | |
22 | * | |
23 | * fit_set_hash_value() attempts to set hash value in a node at offset | |
24 | * given and returns operation status to the caller. | |
25 | * | |
26 | * returns | |
27 | * 0, on success | |
28 | * -1, on failure | |
29 | */ | |
30 | static int fit_set_hash_value(void *fit, int noffset, uint8_t *value, | |
31 | int value_len) | |
32 | { | |
33 | int ret; | |
34 | ||
35 | ret = fdt_setprop(fit, noffset, FIT_VALUE_PROP, value, value_len); | |
36 | if (ret) { | |
37 | printf("Can't set hash '%s' property for '%s' node(%s)\n", | |
38 | FIT_VALUE_PROP, fit_get_name(fit, noffset, NULL), | |
39 | fdt_strerror(ret)); | |
40 | return ret == -FDT_ERR_NOSPACE ? -ENOSPC : -EIO; | |
41 | } | |
42 | ||
43 | return 0; | |
44 | } | |
45 | ||
46 | /** | |
47 | * fit_image_process_hash - Process a single subnode of the images/ node | |
48 | * | |
49 | * Check each subnode and process accordingly. For hash nodes we generate | |
50 | * a hash of the supplised data and store it in the node. | |
51 | * | |
52 | * @fit: pointer to the FIT format image header | |
53 | * @image_name: name of image being processes (used to display errors) | |
54 | * @noffset: subnode offset | |
55 | * @data: data to process | |
56 | * @size: size of data in bytes | |
57 | * @return 0 if ok, -1 on error | |
58 | */ | |
59 | static int fit_image_process_hash(void *fit, const char *image_name, | |
60 | int noffset, const void *data, size_t size) | |
61 | { | |
62 | uint8_t value[FIT_MAX_HASH_LEN]; | |
63 | const char *node_name; | |
64 | int value_len; | |
65 | char *algo; | |
66 | int ret; | |
67 | ||
68 | node_name = fit_get_name(fit, noffset, NULL); | |
69 | ||
70 | if (fit_image_hash_get_algo(fit, noffset, &algo)) { | |
71 | printf("Can't get hash algo property for '%s' hash node in '%s' image node\n", | |
72 | node_name, image_name); | |
73 | return -ENOENT; | |
74 | } | |
75 | ||
76 | if (calculate_hash(data, size, algo, value, &value_len)) { | |
77 | printf("Unsupported hash algorithm (%s) for '%s' hash node in '%s' image node\n", | |
78 | algo, node_name, image_name); | |
79 | return -EPROTONOSUPPORT; | |
80 | } | |
81 | ||
82 | ret = fit_set_hash_value(fit, noffset, value, value_len); | |
83 | if (ret) { | |
84 | printf("Can't set hash value for '%s' hash node in '%s' image node\n", | |
85 | node_name, image_name); | |
86 | return ret; | |
87 | } | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
92 | /** | |
93 | * fit_image_write_sig() - write the signature to a FIT | |
94 | * | |
95 | * This writes the signature and signer data to the FIT. | |
96 | * | |
97 | * @fit: pointer to the FIT format image header | |
98 | * @noffset: hash node offset | |
99 | * @value: signature value to be set | |
100 | * @value_len: signature value length | |
101 | * @comment: Text comment to write (NULL for none) | |
102 | * | |
103 | * returns | |
104 | * 0, on success | |
105 | * -FDT_ERR_..., on failure | |
106 | */ | |
107 | static int fit_image_write_sig(void *fit, int noffset, uint8_t *value, | |
108 | int value_len, const char *comment, const char *region_prop, | |
109 | int region_proplen, const char *cmdname) | |
110 | { | |
111 | int string_size; | |
112 | int ret; | |
113 | ||
114 | /* | |
115 | * Get the current string size, before we update the FIT and add | |
116 | * more | |
117 | */ | |
118 | string_size = fdt_size_dt_strings(fit); | |
119 | ||
120 | ret = fdt_setprop(fit, noffset, FIT_VALUE_PROP, value, value_len); | |
121 | if (!ret) { | |
122 | ret = fdt_setprop_string(fit, noffset, "signer-name", | |
123 | "mkimage"); | |
124 | } | |
125 | if (!ret) { | |
126 | ret = fdt_setprop_string(fit, noffset, "signer-version", | |
127 | PLAIN_VERSION); | |
128 | } | |
129 | if (comment && !ret) | |
130 | ret = fdt_setprop_string(fit, noffset, "comment", comment); | |
131 | if (!ret) { | |
132 | time_t timestamp = imagetool_get_source_date(cmdname, | |
133 | time(NULL)); | |
134 | ||
135 | ret = fit_set_timestamp(fit, noffset, timestamp); | |
136 | } | |
137 | if (region_prop && !ret) { | |
138 | uint32_t strdata[2]; | |
139 | ||
140 | ret = fdt_setprop(fit, noffset, "hashed-nodes", | |
141 | region_prop, region_proplen); | |
142 | /* This is a legacy offset, it is unused, and must remain 0. */ | |
143 | strdata[0] = 0; | |
144 | strdata[1] = cpu_to_fdt32(string_size); | |
145 | if (!ret) { | |
146 | ret = fdt_setprop(fit, noffset, "hashed-strings", | |
147 | strdata, sizeof(strdata)); | |
148 | } | |
149 | } | |
150 | ||
151 | return ret; | |
152 | } | |
153 | ||
154 | static int fit_image_setup_sig(struct image_sign_info *info, | |
155 | const char *keydir, void *fit, const char *image_name, | |
156 | int noffset, const char *require_keys, const char *engine_id) | |
157 | { | |
158 | const char *node_name; | |
159 | char *algo_name; | |
160 | ||
161 | node_name = fit_get_name(fit, noffset, NULL); | |
162 | if (fit_image_hash_get_algo(fit, noffset, &algo_name)) { | |
163 | printf("Can't get algo property for '%s' signature node in '%s' image node\n", | |
164 | node_name, image_name); | |
165 | return -1; | |
166 | } | |
167 | ||
168 | memset(info, '\0', sizeof(*info)); | |
169 | info->keydir = keydir; | |
170 | info->keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL); | |
171 | info->fit = fit; | |
172 | info->node_offset = noffset; | |
173 | info->name = strdup(algo_name); | |
174 | info->checksum = image_get_checksum_algo(algo_name); | |
175 | info->crypto = image_get_crypto_algo(algo_name); | |
176 | info->require_keys = require_keys; | |
177 | info->engine_id = engine_id; | |
178 | if (!info->checksum || !info->crypto) { | |
179 | printf("Unsupported signature algorithm (%s) for '%s' signature node in '%s' image node\n", | |
180 | algo_name, node_name, image_name); | |
181 | return -1; | |
182 | } | |
183 | ||
184 | return 0; | |
185 | } | |
186 | ||
187 | /** | |
188 | * fit_image_process_sig- Process a single subnode of the images/ node | |
189 | * | |
190 | * Check each subnode and process accordingly. For signature nodes we | |
191 | * generate a signed hash of the supplised data and store it in the node. | |
192 | * | |
193 | * @keydir: Directory containing keys to use for signing | |
194 | * @keydest: Destination FDT blob to write public keys into | |
195 | * @fit: pointer to the FIT format image header | |
196 | * @image_name: name of image being processes (used to display errors) | |
197 | * @noffset: subnode offset | |
198 | * @data: data to process | |
199 | * @size: size of data in bytes | |
200 | * @comment: Comment to add to signature nodes | |
201 | * @require_keys: Mark all keys as 'required' | |
202 | * @engine_id: Engine to use for signing | |
203 | * @return 0 if ok, -1 on error | |
204 | */ | |
205 | static int fit_image_process_sig(const char *keydir, void *keydest, | |
206 | void *fit, const char *image_name, | |
207 | int noffset, const void *data, size_t size, | |
208 | const char *comment, int require_keys, const char *engine_id, | |
209 | const char *cmdname) | |
210 | { | |
211 | struct image_sign_info info; | |
212 | struct image_region region; | |
213 | const char *node_name; | |
214 | uint8_t *value; | |
215 | uint value_len; | |
216 | int ret; | |
217 | ||
218 | if (fit_image_setup_sig(&info, keydir, fit, image_name, noffset, | |
219 | require_keys ? "image" : NULL, engine_id)) | |
220 | return -1; | |
221 | ||
222 | node_name = fit_get_name(fit, noffset, NULL); | |
223 | region.data = data; | |
224 | region.size = size; | |
225 | ret = info.crypto->sign(&info, ®ion, 1, &value, &value_len); | |
226 | if (ret) { | |
227 | printf("Failed to sign '%s' signature node in '%s' image node: %d\n", | |
228 | node_name, image_name, ret); | |
229 | ||
230 | /* We allow keys to be missing */ | |
231 | if (ret == -ENOENT) | |
232 | return 0; | |
233 | return -1; | |
234 | } | |
235 | ||
236 | ret = fit_image_write_sig(fit, noffset, value, value_len, comment, | |
237 | NULL, 0, cmdname); | |
238 | if (ret) { | |
239 | if (ret == -FDT_ERR_NOSPACE) | |
240 | return -ENOSPC; | |
241 | printf("Can't write signature for '%s' signature node in '%s' conf node: %s\n", | |
242 | node_name, image_name, fdt_strerror(ret)); | |
243 | return -1; | |
244 | } | |
245 | free(value); | |
246 | ||
247 | /* Get keyname again, as FDT has changed and invalidated our pointer */ | |
248 | info.keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL); | |
249 | ||
250 | /* | |
251 | * Write the public key into the supplied FDT file; this might fail | |
252 | * several times, since we try signing with successively increasing | |
253 | * size values | |
254 | */ | |
255 | if (keydest) { | |
256 | ret = info.crypto->add_verify_data(&info, keydest); | |
257 | if (ret) { | |
258 | printf("Failed to add verification data for '%s' signature node in '%s' image node\n", | |
259 | node_name, image_name); | |
260 | return ret; | |
261 | } | |
262 | } | |
263 | ||
264 | return 0; | |
265 | } | |
266 | ||
267 | /** | |
268 | * fit_image_add_verification_data() - calculate/set verig. data for image node | |
269 | * | |
270 | * This adds hash and signature values for an component image node. | |
271 | * | |
272 | * All existing hash subnodes are checked, if algorithm property is set to | |
273 | * one of the supported hash algorithms, hash value is computed and | |
274 | * corresponding hash node property is set, for example: | |
275 | * | |
276 | * Input component image node structure: | |
277 | * | |
278 | * o image-1 (at image_noffset) | |
279 | * | - data = [binary data] | |
280 | * o hash-1 | |
281 | * |- algo = "sha1" | |
282 | * | |
283 | * Output component image node structure: | |
284 | * | |
285 | * o image-1 (at image_noffset) | |
286 | * | - data = [binary data] | |
287 | * o hash-1 | |
288 | * |- algo = "sha1" | |
289 | * |- value = sha1(data) | |
290 | * | |
291 | * For signature details, please see doc/uImage.FIT/signature.txt | |
292 | * | |
293 | * @keydir Directory containing *.key and *.crt files (or NULL) | |
294 | * @keydest FDT Blob to write public keys into (NULL if none) | |
295 | * @fit: Pointer to the FIT format image header | |
296 | * @image_noffset: Requested component image node | |
297 | * @comment: Comment to add to signature nodes | |
298 | * @require_keys: Mark all keys as 'required' | |
299 | * @engine_id: Engine to use for signing | |
300 | * @return: 0 on success, <0 on failure | |
301 | */ | |
302 | int fit_image_add_verification_data(const char *keydir, void *keydest, | |
303 | void *fit, int image_noffset, const char *comment, | |
304 | int require_keys, const char *engine_id, const char *cmdname) | |
305 | { | |
306 | const char *image_name; | |
307 | const void *data; | |
308 | size_t size; | |
309 | int noffset; | |
310 | ||
311 | /* Get image data and data length */ | |
312 | if (fit_image_get_data(fit, image_noffset, &data, &size)) { | |
313 | printf("Can't get image data/size\n"); | |
314 | return -1; | |
315 | } | |
316 | ||
317 | image_name = fit_get_name(fit, image_noffset, NULL); | |
318 | ||
319 | /* Process all hash subnodes of the component image node */ | |
320 | for (noffset = fdt_first_subnode(fit, image_noffset); | |
321 | noffset >= 0; | |
322 | noffset = fdt_next_subnode(fit, noffset)) { | |
323 | const char *node_name; | |
324 | int ret = 0; | |
325 | ||
326 | /* | |
327 | * Check subnode name, must be equal to "hash" or "signature". | |
328 | * Multiple hash nodes require unique unit node | |
329 | * names, e.g. hash-1, hash-2, signature-1, etc. | |
330 | */ | |
331 | node_name = fit_get_name(fit, noffset, NULL); | |
332 | if (!strncmp(node_name, FIT_HASH_NODENAME, | |
333 | strlen(FIT_HASH_NODENAME))) { | |
334 | ret = fit_image_process_hash(fit, image_name, noffset, | |
335 | data, size); | |
336 | } else if (IMAGE_ENABLE_SIGN && keydir && | |
337 | !strncmp(node_name, FIT_SIG_NODENAME, | |
338 | strlen(FIT_SIG_NODENAME))) { | |
339 | ret = fit_image_process_sig(keydir, keydest, | |
340 | fit, image_name, noffset, data, size, | |
341 | comment, require_keys, engine_id, cmdname); | |
342 | } | |
343 | if (ret) | |
344 | return ret; | |
345 | } | |
346 | ||
347 | return 0; | |
348 | } | |
349 | ||
350 | struct strlist { | |
351 | int count; | |
352 | char **strings; | |
353 | }; | |
354 | ||
355 | static void strlist_init(struct strlist *list) | |
356 | { | |
357 | memset(list, '\0', sizeof(*list)); | |
358 | } | |
359 | ||
360 | static void strlist_free(struct strlist *list) | |
361 | { | |
362 | int i; | |
363 | ||
364 | for (i = 0; i < list->count; i++) | |
365 | free(list->strings[i]); | |
366 | free(list->strings); | |
367 | } | |
368 | ||
369 | static int strlist_add(struct strlist *list, const char *str) | |
370 | { | |
371 | char *dup; | |
372 | ||
373 | dup = strdup(str); | |
374 | list->strings = realloc(list->strings, | |
375 | (list->count + 1) * sizeof(char *)); | |
376 | if (!list || !str) | |
377 | return -1; | |
378 | list->strings[list->count++] = dup; | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | static const char *fit_config_get_image_list(void *fit, int noffset, | |
384 | int *lenp, int *allow_missingp) | |
385 | { | |
386 | static const char default_list[] = FIT_KERNEL_PROP "\0" | |
387 | FIT_FDT_PROP; | |
388 | const char *prop; | |
389 | ||
390 | /* If there is an "image" property, use that */ | |
391 | prop = fdt_getprop(fit, noffset, "sign-images", lenp); | |
392 | if (prop) { | |
393 | *allow_missingp = 0; | |
394 | return *lenp ? prop : NULL; | |
395 | } | |
396 | ||
397 | /* Default image list */ | |
398 | *allow_missingp = 1; | |
399 | *lenp = sizeof(default_list); | |
400 | ||
401 | return default_list; | |
402 | } | |
403 | ||
404 | static int fit_config_get_hash_list(void *fit, int conf_noffset, | |
405 | int sig_offset, struct strlist *node_inc) | |
406 | { | |
407 | int allow_missing; | |
408 | const char *prop, *iname, *end; | |
409 | const char *conf_name, *sig_name; | |
410 | char name[200], path[200]; | |
411 | int image_count; | |
412 | int ret, len; | |
413 | ||
414 | conf_name = fit_get_name(fit, conf_noffset, NULL); | |
415 | sig_name = fit_get_name(fit, sig_offset, NULL); | |
416 | ||
417 | /* | |
418 | * Build a list of nodes we need to hash. We always need the root | |
419 | * node and the configuration. | |
420 | */ | |
421 | strlist_init(node_inc); | |
422 | snprintf(name, sizeof(name), "%s/%s", FIT_CONFS_PATH, conf_name); | |
423 | if (strlist_add(node_inc, "/") || | |
424 | strlist_add(node_inc, name)) | |
425 | goto err_mem; | |
426 | ||
427 | /* Get a list of images that we intend to sign */ | |
428 | prop = fit_config_get_image_list(fit, sig_offset, &len, | |
429 | &allow_missing); | |
430 | if (!prop) | |
431 | return 0; | |
432 | ||
433 | /* Locate the images */ | |
434 | end = prop + len; | |
435 | image_count = 0; | |
436 | for (iname = prop; iname < end; iname += strlen(iname) + 1) { | |
437 | int noffset; | |
438 | int image_noffset; | |
439 | int hash_count; | |
440 | ||
441 | image_noffset = fit_conf_get_prop_node(fit, conf_noffset, | |
442 | iname); | |
443 | if (image_noffset < 0) { | |
444 | printf("Failed to find image '%s' in configuration '%s/%s'\n", | |
445 | iname, conf_name, sig_name); | |
446 | if (allow_missing) | |
447 | continue; | |
448 | ||
449 | return -ENOENT; | |
450 | } | |
451 | ||
452 | ret = fdt_get_path(fit, image_noffset, path, sizeof(path)); | |
453 | if (ret < 0) | |
454 | goto err_path; | |
455 | if (strlist_add(node_inc, path)) | |
456 | goto err_mem; | |
457 | ||
458 | snprintf(name, sizeof(name), "%s/%s", FIT_CONFS_PATH, | |
459 | conf_name); | |
460 | ||
461 | /* Add all this image's hashes */ | |
462 | hash_count = 0; | |
463 | for (noffset = fdt_first_subnode(fit, image_noffset); | |
464 | noffset >= 0; | |
465 | noffset = fdt_next_subnode(fit, noffset)) { | |
466 | const char *name = fit_get_name(fit, noffset, NULL); | |
467 | ||
468 | if (strncmp(name, FIT_HASH_NODENAME, | |
469 | strlen(FIT_HASH_NODENAME))) | |
470 | continue; | |
471 | ret = fdt_get_path(fit, noffset, path, sizeof(path)); | |
472 | if (ret < 0) | |
473 | goto err_path; | |
474 | if (strlist_add(node_inc, path)) | |
475 | goto err_mem; | |
476 | hash_count++; | |
477 | } | |
478 | ||
479 | if (!hash_count) { | |
480 | printf("Failed to find any hash nodes in configuration '%s/%s' image '%s' - without these it is not possible to verify this image\n", | |
481 | conf_name, sig_name, iname); | |
482 | return -ENOMSG; | |
483 | } | |
484 | ||
485 | image_count++; | |
486 | } | |
487 | ||
488 | if (!image_count) { | |
489 | printf("Failed to find any images for configuration '%s/%s'\n", | |
490 | conf_name, sig_name); | |
491 | return -ENOMSG; | |
492 | } | |
493 | ||
494 | return 0; | |
495 | ||
496 | err_mem: | |
497 | printf("Out of memory processing configuration '%s/%s'\n", conf_name, | |
498 | sig_name); | |
499 | return -ENOMEM; | |
500 | ||
501 | err_path: | |
502 | printf("Failed to get path for image '%s' in configuration '%s/%s': %s\n", | |
503 | iname, conf_name, sig_name, fdt_strerror(ret)); | |
504 | return -ENOENT; | |
505 | } | |
506 | ||
507 | static int fit_config_get_data(void *fit, int conf_noffset, int noffset, | |
508 | struct image_region **regionp, int *region_countp, | |
509 | char **region_propp, int *region_proplen) | |
510 | { | |
511 | char * const exc_prop[] = {"data"}; | |
512 | struct strlist node_inc; | |
513 | struct image_region *region; | |
514 | struct fdt_region fdt_regions[100]; | |
515 | const char *conf_name, *sig_name; | |
516 | char path[200]; | |
517 | int count, i; | |
518 | char *region_prop; | |
519 | int ret, len; | |
520 | ||
521 | conf_name = fit_get_name(fit, conf_noffset, NULL); | |
522 | sig_name = fit_get_name(fit, noffset, NULL); | |
523 | debug("%s: conf='%s', sig='%s'\n", __func__, conf_name, sig_name); | |
524 | ||
525 | /* Get a list of nodes we want to hash */ | |
526 | ret = fit_config_get_hash_list(fit, conf_noffset, noffset, &node_inc); | |
527 | if (ret) | |
528 | return ret; | |
529 | ||
530 | /* Get a list of regions to hash */ | |
531 | count = fdt_find_regions(fit, node_inc.strings, node_inc.count, | |
532 | exc_prop, ARRAY_SIZE(exc_prop), | |
533 | fdt_regions, ARRAY_SIZE(fdt_regions), | |
534 | path, sizeof(path), 1); | |
535 | if (count < 0) { | |
536 | printf("Failed to hash configuration '%s/%s': %s\n", conf_name, | |
537 | sig_name, fdt_strerror(ret)); | |
538 | return -EIO; | |
539 | } | |
540 | if (count == 0) { | |
541 | printf("No data to hash for configuration '%s/%s': %s\n", | |
542 | conf_name, sig_name, fdt_strerror(ret)); | |
543 | return -EINVAL; | |
544 | } | |
545 | ||
546 | /* Build our list of data blocks */ | |
547 | region = fit_region_make_list(fit, fdt_regions, count, NULL); | |
548 | if (!region) { | |
549 | printf("Out of memory hashing configuration '%s/%s'\n", | |
550 | conf_name, sig_name); | |
551 | return -ENOMEM; | |
552 | } | |
553 | ||
554 | /* Create a list of all hashed properties */ | |
555 | debug("Hash nodes:\n"); | |
556 | for (i = len = 0; i < node_inc.count; i++) { | |
557 | debug(" %s\n", node_inc.strings[i]); | |
558 | len += strlen(node_inc.strings[i]) + 1; | |
559 | } | |
560 | region_prop = malloc(len); | |
561 | if (!region_prop) { | |
562 | printf("Out of memory setting up regions for configuration '%s/%s'\n", | |
563 | conf_name, sig_name); | |
564 | return -ENOMEM; | |
565 | } | |
566 | for (i = len = 0; i < node_inc.count; | |
567 | len += strlen(node_inc.strings[i]) + 1, i++) | |
568 | strcpy(region_prop + len, node_inc.strings[i]); | |
569 | strlist_free(&node_inc); | |
570 | ||
571 | *region_countp = count; | |
572 | *regionp = region; | |
573 | *region_propp = region_prop; | |
574 | *region_proplen = len; | |
575 | ||
576 | return 0; | |
577 | } | |
578 | ||
579 | static int fit_config_process_sig(const char *keydir, void *keydest, | |
580 | void *fit, const char *conf_name, int conf_noffset, | |
581 | int noffset, const char *comment, int require_keys, | |
582 | const char *engine_id, const char *cmdname) | |
583 | { | |
584 | struct image_sign_info info; | |
585 | const char *node_name; | |
586 | struct image_region *region; | |
587 | char *region_prop; | |
588 | int region_proplen; | |
589 | int region_count; | |
590 | uint8_t *value; | |
591 | uint value_len; | |
592 | int ret; | |
593 | ||
594 | node_name = fit_get_name(fit, noffset, NULL); | |
595 | if (fit_config_get_data(fit, conf_noffset, noffset, ®ion, | |
596 | ®ion_count, ®ion_prop, ®ion_proplen)) | |
597 | return -1; | |
598 | ||
599 | if (fit_image_setup_sig(&info, keydir, fit, conf_name, noffset, | |
600 | require_keys ? "conf" : NULL, engine_id)) | |
601 | return -1; | |
602 | ||
603 | ret = info.crypto->sign(&info, region, region_count, &value, | |
604 | &value_len); | |
605 | free(region); | |
606 | if (ret) { | |
607 | printf("Failed to sign '%s' signature node in '%s' conf node\n", | |
608 | node_name, conf_name); | |
609 | ||
610 | /* We allow keys to be missing */ | |
611 | if (ret == -ENOENT) | |
612 | return 0; | |
613 | return -1; | |
614 | } | |
615 | ||
616 | ret = fit_image_write_sig(fit, noffset, value, value_len, comment, | |
617 | region_prop, region_proplen, cmdname); | |
618 | if (ret) { | |
619 | if (ret == -FDT_ERR_NOSPACE) | |
620 | return -ENOSPC; | |
621 | printf("Can't write signature for '%s' signature node in '%s' conf node: %s\n", | |
622 | node_name, conf_name, fdt_strerror(ret)); | |
623 | return -1; | |
624 | } | |
625 | free(value); | |
626 | free(region_prop); | |
627 | ||
628 | /* Get keyname again, as FDT has changed and invalidated our pointer */ | |
629 | info.keyname = fdt_getprop(fit, noffset, "key-name-hint", NULL); | |
630 | ||
631 | /* Write the public key into the supplied FDT file */ | |
632 | if (keydest) { | |
633 | ret = info.crypto->add_verify_data(&info, keydest); | |
634 | if (ret) { | |
635 | printf("Failed to add verification data for '%s' signature node in '%s' configuration node\n", | |
636 | node_name, conf_name); | |
637 | } | |
638 | return ret; | |
639 | } | |
640 | ||
641 | return 0; | |
642 | } | |
643 | ||
644 | static int fit_config_add_verification_data(const char *keydir, void *keydest, | |
645 | void *fit, int conf_noffset, const char *comment, | |
646 | int require_keys, const char *engine_id, const char *cmdname) | |
647 | { | |
648 | const char *conf_name; | |
649 | int noffset; | |
650 | ||
651 | conf_name = fit_get_name(fit, conf_noffset, NULL); | |
652 | ||
653 | /* Process all hash subnodes of the configuration node */ | |
654 | for (noffset = fdt_first_subnode(fit, conf_noffset); | |
655 | noffset >= 0; | |
656 | noffset = fdt_next_subnode(fit, noffset)) { | |
657 | const char *node_name; | |
658 | int ret = 0; | |
659 | ||
660 | node_name = fit_get_name(fit, noffset, NULL); | |
661 | if (!strncmp(node_name, FIT_SIG_NODENAME, | |
662 | strlen(FIT_SIG_NODENAME))) { | |
663 | ret = fit_config_process_sig(keydir, keydest, | |
664 | fit, conf_name, conf_noffset, noffset, comment, | |
665 | require_keys, engine_id, cmdname); | |
666 | } | |
667 | if (ret) | |
668 | return ret; | |
669 | } | |
670 | ||
671 | return 0; | |
672 | } | |
673 | ||
674 | int fit_add_verification_data(const char *keydir, void *keydest, void *fit, | |
675 | const char *comment, int require_keys, | |
676 | const char *engine_id, const char *cmdname) | |
677 | { | |
678 | int images_noffset, confs_noffset; | |
679 | int noffset; | |
680 | int ret; | |
681 | ||
682 | /* Find images parent node offset */ | |
683 | images_noffset = fdt_path_offset(fit, FIT_IMAGES_PATH); | |
684 | if (images_noffset < 0) { | |
685 | printf("Can't find images parent node '%s' (%s)\n", | |
686 | FIT_IMAGES_PATH, fdt_strerror(images_noffset)); | |
687 | return images_noffset; | |
688 | } | |
689 | ||
690 | /* Process its subnodes, print out component images details */ | |
691 | for (noffset = fdt_first_subnode(fit, images_noffset); | |
692 | noffset >= 0; | |
693 | noffset = fdt_next_subnode(fit, noffset)) { | |
694 | /* | |
695 | * Direct child node of the images parent node, | |
696 | * i.e. component image node. | |
697 | */ | |
698 | ret = fit_image_add_verification_data(keydir, keydest, | |
699 | fit, noffset, comment, require_keys, engine_id, | |
700 | cmdname); | |
701 | if (ret) | |
702 | return ret; | |
703 | } | |
704 | ||
705 | /* If there are no keys, we can't sign configurations */ | |
706 | if (!IMAGE_ENABLE_SIGN || !keydir) | |
707 | return 0; | |
708 | ||
709 | /* Find configurations parent node offset */ | |
710 | confs_noffset = fdt_path_offset(fit, FIT_CONFS_PATH); | |
711 | if (confs_noffset < 0) { | |
712 | printf("Can't find images parent node '%s' (%s)\n", | |
713 | FIT_CONFS_PATH, fdt_strerror(confs_noffset)); | |
714 | return -ENOENT; | |
715 | } | |
716 | ||
717 | /* Process its subnodes, print out component images details */ | |
718 | for (noffset = fdt_first_subnode(fit, confs_noffset); | |
719 | noffset >= 0; | |
720 | noffset = fdt_next_subnode(fit, noffset)) { | |
721 | ret = fit_config_add_verification_data(keydir, keydest, | |
722 | fit, noffset, comment, | |
723 | require_keys, | |
724 | engine_id, cmdname); | |
725 | if (ret) | |
726 | return ret; | |
727 | } | |
728 | ||
729 | return 0; | |
730 | } | |
731 | ||
732 | #ifdef CONFIG_FIT_SIGNATURE | |
733 | int fit_check_sign(const void *fit, const void *key) | |
734 | { | |
735 | int cfg_noffset; | |
736 | int ret; | |
737 | ||
738 | cfg_noffset = fit_conf_get_node(fit, NULL); | |
739 | if (!cfg_noffset) | |
740 | return -1; | |
741 | ||
742 | printf("Verifying Hash Integrity ... "); | |
743 | ret = fit_config_verify(fit, cfg_noffset); | |
744 | if (ret) | |
745 | return ret; | |
746 | ret = bootm_host_load_images(fit, cfg_noffset); | |
747 | ||
748 | return ret; | |
749 | } | |
750 | #endif |