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AKASHI Takahirob983cc22020-02-21 15:12:55 +09001// 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>
Simon Glassf7ae49f2020-05-10 11:40:05 -060011#include <log.h>
AKASHI Takahirob983cc22020-02-21 15:12:55 +090012#include <malloc.h>
Simon Glass401d1c42020-10-30 21:38:53 -060013#include <asm/global_data.h>
AKASHI Takahirob983cc22020-02-21 15:12:55 +090014DECLARE_GLOBAL_DATA_PTR;
15#endif /* !USE_HOSTCC*/
Masahiro Yamada64045a62020-04-16 18:30:18 +090016#include <fdt_region.h>
AKASHI Takahirob983cc22020-02-21 15:12:55 +090017#include <image.h>
18#include <u-boot/rsa.h>
Alexandru Gagniuc0bcb28d2021-02-19 12:45:10 -060019#include <u-boot/hash-checksum.h>
AKASHI Takahirob983cc22020-02-21 15:12:55 +090020
21#define IMAGE_MAX_HASHED_NODES 100
22
AKASHI Takahirob983cc22020-02-21 15:12:55 +090023/**
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 */
38struct 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
68static 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));
Tom Rini1f47e2a2020-04-07 11:58:44 -040090 info->keyname = fdt_getprop(fit, noffset, FIT_KEY_HINT, NULL);
AKASHI Takahirob983cc22020-02-21 15:12:55 +090091 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
109int 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
139static 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
Simon Glass79af75f2021-02-15 17:08:06 -0700152 /*
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 }
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900160 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
181error:
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
188int 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
Tom Rini1f47e2a2020-04-07 11:58:44 -0400209 required = fdt_getprop(sig_blob, noffset, FIT_KEY_REQUIRED,
210 NULL);
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900211 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
Tom Rini1f47e2a2020-04-07 11:58:44 -0400229/**
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 */
244static int fit_config_check_sig(const void *fit, int noffset,
245 int required_keynode, int conf_noffset,
246 char **err_msgp)
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900247{
John Keeping8edecd32021-04-20 19:19:44 +0100248 static char * const exc_prop[] = {
249 "data",
250 "data-size",
251 "data-position",
252 "data-offset"
253 };
254
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900255 const char *prop, *end, *name;
256 struct image_sign_info info;
257 const uint32_t *strings;
Tom Rini1f47e2a2020-04-07 11:58:44 -0400258 const char *config_name;
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900259 uint8_t *fit_value;
260 int fit_value_len;
Tom Rini1f47e2a2020-04-07 11:58:44 -0400261 bool found_config;
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900262 int max_regions;
263 int i, prop_len;
264 char path[200];
265 int count;
266
Tom Rini1f47e2a2020-04-07 11:58:44 -0400267 config_name = fit_get_name(fit, conf_noffset, NULL);
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900268 debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(),
269 fit_get_name(fit, noffset, NULL),
270 fit_get_name(gd_fdt_blob(), required_keynode, NULL));
271 *err_msgp = NULL;
272 if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
273 err_msgp))
274 return -1;
275
276 if (fit_image_hash_get_value(fit, noffset, &fit_value,
277 &fit_value_len)) {
278 *err_msgp = "Can't get hash value property";
279 return -1;
280 }
281
282 /* Count the number of strings in the property */
283 prop = fdt_getprop(fit, noffset, "hashed-nodes", &prop_len);
284 end = prop ? prop + prop_len : prop;
285 for (name = prop, count = 0; name < end; name++)
286 if (!*name)
287 count++;
288 if (!count) {
289 *err_msgp = "Can't get hashed-nodes property";
290 return -1;
291 }
292
293 if (prop && prop_len > 0 && prop[prop_len - 1] != '\0') {
294 *err_msgp = "hashed-nodes property must be null-terminated";
295 return -1;
296 }
297
298 /* Add a sanity check here since we are using the stack */
299 if (count > IMAGE_MAX_HASHED_NODES) {
300 *err_msgp = "Number of hashed nodes exceeds maximum";
301 return -1;
302 }
303
304 /* Create a list of node names from those strings */
305 char *node_inc[count];
306
307 debug("Hash nodes (%d):\n", count);
Tom Rini1f47e2a2020-04-07 11:58:44 -0400308 found_config = false;
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900309 for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
310 debug(" '%s'\n", name);
311 node_inc[i] = (char *)name;
Tom Rini1f47e2a2020-04-07 11:58:44 -0400312 if (!strncmp(FIT_CONFS_PATH, name, strlen(FIT_CONFS_PATH)) &&
313 name[sizeof(FIT_CONFS_PATH) - 1] == '/' &&
314 !strcmp(name + sizeof(FIT_CONFS_PATH), config_name)) {
315 debug(" (found config node %s)", config_name);
316 found_config = true;
317 }
318 }
319 if (!found_config) {
320 *err_msgp = "Selected config not in hashed nodes";
321 return -1;
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900322 }
323
324 /*
325 * Each node can generate one region for each sub-node. Allow for
326 * 7 sub-nodes (hash-1, signature-1, etc.) and some extra.
327 */
328 max_regions = 20 + count * 7;
329 struct fdt_region fdt_regions[max_regions];
330
331 /* Get a list of regions to hash */
332 count = fdt_find_regions(fit, node_inc, count,
333 exc_prop, ARRAY_SIZE(exc_prop),
334 fdt_regions, max_regions - 1,
335 path, sizeof(path), 0);
336 if (count < 0) {
337 *err_msgp = "Failed to hash configuration";
338 return -1;
339 }
340 if (count == 0) {
341 *err_msgp = "No data to hash";
342 return -1;
343 }
344 if (count >= max_regions - 1) {
345 *err_msgp = "Too many hash regions";
346 return -1;
347 }
348
349 /* Add the strings */
350 strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
351 if (strings) {
352 /*
353 * The strings region offset must be a static 0x0.
354 * This is set in tool/image-host.c
355 */
356 fdt_regions[count].offset = fdt_off_dt_strings(fit);
357 fdt_regions[count].size = fdt32_to_cpu(strings[1]);
358 count++;
359 }
360
361 /* Allocate the region list on the stack */
362 struct image_region region[count];
363
364 fit_region_make_list(fit, fdt_regions, count, region);
365 if (info.crypto->verify(&info, region, count, fit_value,
366 fit_value_len)) {
367 *err_msgp = "Verification failed";
368 return -1;
369 }
370
371 return 0;
372}
373
374static int fit_config_verify_sig(const void *fit, int conf_noffset,
375 const void *sig_blob, int sig_offset)
376{
377 int noffset;
Alexandru Gagniuc76c78a52021-01-11 08:46:58 -0600378 char *err_msg = "No 'signature' subnode found";
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900379 int verified = 0;
380 int ret;
381
382 /* Process all hash subnodes of the component conf node */
383 fdt_for_each_subnode(noffset, fit, conf_noffset) {
384 const char *name = fit_get_name(fit, noffset, NULL);
385
386 if (!strncmp(name, FIT_SIG_NODENAME,
387 strlen(FIT_SIG_NODENAME))) {
388 ret = fit_config_check_sig(fit, noffset, sig_offset,
Tom Rini1f47e2a2020-04-07 11:58:44 -0400389 conf_noffset, &err_msg);
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900390 if (ret) {
391 puts("- ");
392 } else {
393 puts("+ ");
394 verified = 1;
395 break;
396 }
397 }
398 }
399
400 if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
401 err_msg = "Corrupted or truncated tree";
402 goto error;
403 }
404
Tom Rini1f47e2a2020-04-07 11:58:44 -0400405 if (verified)
406 return 0;
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900407
408error:
409 printf(" error!\n%s for '%s' hash node in '%s' config node\n",
410 err_msg, fit_get_name(fit, noffset, NULL),
411 fit_get_name(fit, conf_noffset, NULL));
Tom Rini1f47e2a2020-04-07 11:58:44 -0400412 return -EPERM;
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900413}
414
Simon Glass79af75f2021-02-15 17:08:06 -0700415static int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
416 const void *sig_blob)
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900417{
Simon Glass79af75f2021-02-15 17:08:06 -0700418 const char *name = fit_get_name(fit, conf_noffset, NULL);
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900419 int noffset;
420 int sig_node;
Thirupathaiah Annapureddy182eeef2020-08-16 23:01:09 -0700421 int verified = 0;
422 int reqd_sigs = 0;
423 bool reqd_policy_all = true;
424 const char *reqd_mode;
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900425
Simon Glass79af75f2021-02-15 17:08:06 -0700426 /*
427 * We don't support this since libfdt considers names with the
428 * name root but different @ suffix to be equal
429 */
430 if (strchr(name, '@')) {
431 printf("Configuration node '%s' contains '@'\n", name);
432 return -EPERM;
433 }
434
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900435 /* Work out what we need to verify */
436 sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
437 if (sig_node < 0) {
438 debug("%s: No signature node found: %s\n", __func__,
439 fdt_strerror(sig_node));
440 return 0;
441 }
442
Thirupathaiah Annapureddy182eeef2020-08-16 23:01:09 -0700443 /* Get required-mode policy property from DTB */
444 reqd_mode = fdt_getprop(sig_blob, sig_node, "required-mode", NULL);
445 if (reqd_mode && !strcmp(reqd_mode, "any"))
446 reqd_policy_all = false;
447
448 debug("%s: required-mode policy set to '%s'\n", __func__,
449 reqd_policy_all ? "all" : "any");
450
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900451 fdt_for_each_subnode(noffset, sig_blob, sig_node) {
452 const char *required;
453 int ret;
454
Tom Rini1f47e2a2020-04-07 11:58:44 -0400455 required = fdt_getprop(sig_blob, noffset, FIT_KEY_REQUIRED,
456 NULL);
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900457 if (!required || strcmp(required, "conf"))
458 continue;
Thirupathaiah Annapureddy182eeef2020-08-16 23:01:09 -0700459
460 reqd_sigs++;
461
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900462 ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
463 noffset);
464 if (ret) {
Thirupathaiah Annapureddy182eeef2020-08-16 23:01:09 -0700465 if (reqd_policy_all) {
466 printf("Failed to verify required signature '%s'\n",
467 fit_get_name(sig_blob, noffset, NULL));
468 return ret;
469 }
470 } else {
471 verified++;
472 if (!reqd_policy_all)
473 break;
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900474 }
475 }
476
Thirupathaiah Annapureddy182eeef2020-08-16 23:01:09 -0700477 if (reqd_sigs && !verified) {
478 printf("Failed to verify 'any' of the required signature(s)\n");
479 return -EPERM;
480 }
481
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900482 return 0;
483}
484
485int fit_config_verify(const void *fit, int conf_noffset)
486{
487 return fit_config_verify_required_sigs(fit, conf_noffset,
488 gd_fdt_blob());
489}