blob: cc1967109ead26d25add0a2f917a7d9debc61be9 [file] [log] [blame]
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>
13DECLARE_GLOBAL_DATA_PTR;
14#endif /* !USE_HOSTCC*/
Masahiro Yamada64045a62020-04-16 18:30:18 +090015#include <fdt_region.h>
AKASHI Takahirob983cc22020-02-21 15:12:55 +090016#include <image.h>
17#include <u-boot/rsa.h>
18#include <u-boot/rsa-checksum.h>
19
20#define IMAGE_MAX_HASHED_NODES 100
21
22#ifdef USE_HOSTCC
23void *host_blob;
24
25void image_set_host_blob(void *blob)
26{
27 host_blob = blob;
28}
29
30void *image_get_host_blob(void)
31{
32 return host_blob;
33}
34#endif
35
36/**
37 * fit_region_make_list() - Make a list of image regions
38 *
39 * Given a list of fdt_regions, create a list of image_regions. This is a
40 * simple conversion routine since the FDT and image code use different
41 * structures.
42 *
43 * @fit: FIT image
44 * @fdt_regions: Pointer to FDT regions
45 * @count: Number of FDT regions
46 * @region: Pointer to image regions, which must hold @count records. If
47 * region is NULL, then (except for an SPL build) the array will be
48 * allocated.
49 * @return: Pointer to image regions
50 */
51struct image_region *fit_region_make_list(const void *fit,
52 struct fdt_region *fdt_regions,
53 int count,
54 struct image_region *region)
55{
56 int i;
57
58 debug("Hash regions:\n");
59 debug("%10s %10s\n", "Offset", "Size");
60
61 /*
62 * Use malloc() except in SPL (to save code size). In SPL the caller
63 * must allocate the array.
64 */
65#ifndef CONFIG_SPL_BUILD
66 if (!region)
67 region = calloc(sizeof(*region), count);
68#endif
69 if (!region)
70 return NULL;
71 for (i = 0; i < count; i++) {
72 debug("%10x %10x\n", fdt_regions[i].offset,
73 fdt_regions[i].size);
74 region[i].data = fit + fdt_regions[i].offset;
75 region[i].size = fdt_regions[i].size;
76 }
77
78 return region;
79}
80
81static int fit_image_setup_verify(struct image_sign_info *info,
82 const void *fit, int noffset,
83 int required_keynode, char **err_msgp)
84{
85 char *algo_name;
86 const char *padding_name;
87
88 if (fdt_totalsize(fit) > CONFIG_FIT_SIGNATURE_MAX_SIZE) {
89 *err_msgp = "Total size too large";
90 return 1;
91 }
92
93 if (fit_image_hash_get_algo(fit, noffset, &algo_name)) {
94 *err_msgp = "Can't get hash algo property";
95 return -1;
96 }
97
98 padding_name = fdt_getprop(fit, noffset, "padding", NULL);
99 if (!padding_name)
100 padding_name = RSA_DEFAULT_PADDING_NAME;
101
102 memset(info, '\0', sizeof(*info));
Tom Rini1f47e2a2020-04-07 11:58:44 -0400103 info->keyname = fdt_getprop(fit, noffset, FIT_KEY_HINT, NULL);
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900104 info->fit = (void *)fit;
105 info->node_offset = noffset;
106 info->name = algo_name;
107 info->checksum = image_get_checksum_algo(algo_name);
108 info->crypto = image_get_crypto_algo(algo_name);
109 info->padding = image_get_padding_algo(padding_name);
110 info->fdt_blob = gd_fdt_blob();
111 info->required_keynode = required_keynode;
112 printf("%s:%s", algo_name, info->keyname);
113
114 if (!info->checksum || !info->crypto || !info->padding) {
115 *err_msgp = "Unknown signature algorithm";
116 return -1;
117 }
118
119 return 0;
120}
121
122int fit_image_check_sig(const void *fit, int noffset, const void *data,
123 size_t size, int required_keynode, char **err_msgp)
124{
125 struct image_sign_info info;
126 struct image_region region;
127 uint8_t *fit_value;
128 int fit_value_len;
129
130 *err_msgp = NULL;
131 if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
132 err_msgp))
133 return -1;
134
135 if (fit_image_hash_get_value(fit, noffset, &fit_value,
136 &fit_value_len)) {
137 *err_msgp = "Can't get hash value property";
138 return -1;
139 }
140
141 region.data = data;
142 region.size = size;
143
144 if (info.crypto->verify(&info, &region, 1, fit_value, fit_value_len)) {
145 *err_msgp = "Verification failed";
146 return -1;
147 }
148
149 return 0;
150}
151
152static int fit_image_verify_sig(const void *fit, int image_noffset,
153 const char *data, size_t size,
154 const void *sig_blob, int sig_offset)
155{
156 int noffset;
157 char *err_msg = "";
158 int verified = 0;
159 int ret;
160
161 /* Process all hash subnodes of the component image node */
162 fdt_for_each_subnode(noffset, fit, image_noffset) {
163 const char *name = fit_get_name(fit, noffset, NULL);
164
165 if (!strncmp(name, FIT_SIG_NODENAME,
166 strlen(FIT_SIG_NODENAME))) {
167 ret = fit_image_check_sig(fit, noffset, data,
168 size, -1, &err_msg);
169 if (ret) {
170 puts("- ");
171 } else {
172 puts("+ ");
173 verified = 1;
174 break;
175 }
176 }
177 }
178
179 if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
180 err_msg = "Corrupted or truncated tree";
181 goto error;
182 }
183
184 return verified ? 0 : -EPERM;
185
186error:
187 printf(" error!\n%s for '%s' hash node in '%s' image node\n",
188 err_msg, fit_get_name(fit, noffset, NULL),
189 fit_get_name(fit, image_noffset, NULL));
190 return -1;
191}
192
193int fit_image_verify_required_sigs(const void *fit, int image_noffset,
194 const char *data, size_t size,
195 const void *sig_blob, int *no_sigsp)
196{
197 int verify_count = 0;
198 int noffset;
199 int sig_node;
200
201 /* Work out what we need to verify */
202 *no_sigsp = 1;
203 sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
204 if (sig_node < 0) {
205 debug("%s: No signature node found: %s\n", __func__,
206 fdt_strerror(sig_node));
207 return 0;
208 }
209
210 fdt_for_each_subnode(noffset, sig_blob, sig_node) {
211 const char *required;
212 int ret;
213
Tom Rini1f47e2a2020-04-07 11:58:44 -0400214 required = fdt_getprop(sig_blob, noffset, FIT_KEY_REQUIRED,
215 NULL);
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900216 if (!required || strcmp(required, "image"))
217 continue;
218 ret = fit_image_verify_sig(fit, image_noffset, data, size,
219 sig_blob, noffset);
220 if (ret) {
221 printf("Failed to verify required signature '%s'\n",
222 fit_get_name(sig_blob, noffset, NULL));
223 return ret;
224 }
225 verify_count++;
226 }
227
228 if (verify_count)
229 *no_sigsp = 0;
230
231 return 0;
232}
233
Tom Rini1f47e2a2020-04-07 11:58:44 -0400234/**
235 * fit_config_check_sig() - Check the signature of a config
236 *
237 * @fit: FIT to check
238 * @noffset: Offset of configuration node (e.g. /configurations/conf-1)
239 * @required_keynode: Offset in the control FDT of the required key node,
240 * if any. If this is given, then the configuration wil not
241 * pass verification unless that key is used. If this is
242 * -1 then any signature will do.
243 * @conf_noffset: Offset of the configuration subnode being checked (e.g.
244 * /configurations/conf-1/kernel)
245 * @err_msgp: In the event of an error, this will be pointed to a
246 * help error string to display to the user.
247 * @return 0 if all verified ok, <0 on error
248 */
249static int fit_config_check_sig(const void *fit, int noffset,
250 int required_keynode, int conf_noffset,
251 char **err_msgp)
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900252{
Philippe Reynesc5229492020-04-29 15:26:17 +0200253 char * const exc_prop[] = {"data", "data-size", "data-position"};
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900254 const char *prop, *end, *name;
255 struct image_sign_info info;
256 const uint32_t *strings;
Tom Rini1f47e2a2020-04-07 11:58:44 -0400257 const char *config_name;
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900258 uint8_t *fit_value;
259 int fit_value_len;
Tom Rini1f47e2a2020-04-07 11:58:44 -0400260 bool found_config;
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900261 int max_regions;
262 int i, prop_len;
263 char path[200];
264 int count;
265
Tom Rini1f47e2a2020-04-07 11:58:44 -0400266 config_name = fit_get_name(fit, conf_noffset, NULL);
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900267 debug("%s: fdt=%p, conf='%s', sig='%s'\n", __func__, gd_fdt_blob(),
268 fit_get_name(fit, noffset, NULL),
269 fit_get_name(gd_fdt_blob(), required_keynode, NULL));
270 *err_msgp = NULL;
271 if (fit_image_setup_verify(&info, fit, noffset, required_keynode,
272 err_msgp))
273 return -1;
274
275 if (fit_image_hash_get_value(fit, noffset, &fit_value,
276 &fit_value_len)) {
277 *err_msgp = "Can't get hash value property";
278 return -1;
279 }
280
281 /* Count the number of strings in the property */
282 prop = fdt_getprop(fit, noffset, "hashed-nodes", &prop_len);
283 end = prop ? prop + prop_len : prop;
284 for (name = prop, count = 0; name < end; name++)
285 if (!*name)
286 count++;
287 if (!count) {
288 *err_msgp = "Can't get hashed-nodes property";
289 return -1;
290 }
291
292 if (prop && prop_len > 0 && prop[prop_len - 1] != '\0') {
293 *err_msgp = "hashed-nodes property must be null-terminated";
294 return -1;
295 }
296
297 /* Add a sanity check here since we are using the stack */
298 if (count > IMAGE_MAX_HASHED_NODES) {
299 *err_msgp = "Number of hashed nodes exceeds maximum";
300 return -1;
301 }
302
303 /* Create a list of node names from those strings */
304 char *node_inc[count];
305
306 debug("Hash nodes (%d):\n", count);
Tom Rini1f47e2a2020-04-07 11:58:44 -0400307 found_config = false;
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900308 for (name = prop, i = 0; name < end; name += strlen(name) + 1, i++) {
309 debug(" '%s'\n", name);
310 node_inc[i] = (char *)name;
Tom Rini1f47e2a2020-04-07 11:58:44 -0400311 if (!strncmp(FIT_CONFS_PATH, name, strlen(FIT_CONFS_PATH)) &&
312 name[sizeof(FIT_CONFS_PATH) - 1] == '/' &&
313 !strcmp(name + sizeof(FIT_CONFS_PATH), config_name)) {
314 debug(" (found config node %s)", config_name);
315 found_config = true;
316 }
317 }
318 if (!found_config) {
319 *err_msgp = "Selected config not in hashed nodes";
320 return -1;
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900321 }
322
323 /*
324 * Each node can generate one region for each sub-node. Allow for
325 * 7 sub-nodes (hash-1, signature-1, etc.) and some extra.
326 */
327 max_regions = 20 + count * 7;
328 struct fdt_region fdt_regions[max_regions];
329
330 /* Get a list of regions to hash */
331 count = fdt_find_regions(fit, node_inc, count,
332 exc_prop, ARRAY_SIZE(exc_prop),
333 fdt_regions, max_regions - 1,
334 path, sizeof(path), 0);
335 if (count < 0) {
336 *err_msgp = "Failed to hash configuration";
337 return -1;
338 }
339 if (count == 0) {
340 *err_msgp = "No data to hash";
341 return -1;
342 }
343 if (count >= max_regions - 1) {
344 *err_msgp = "Too many hash regions";
345 return -1;
346 }
347
348 /* Add the strings */
349 strings = fdt_getprop(fit, noffset, "hashed-strings", NULL);
350 if (strings) {
351 /*
352 * The strings region offset must be a static 0x0.
353 * This is set in tool/image-host.c
354 */
355 fdt_regions[count].offset = fdt_off_dt_strings(fit);
356 fdt_regions[count].size = fdt32_to_cpu(strings[1]);
357 count++;
358 }
359
360 /* Allocate the region list on the stack */
361 struct image_region region[count];
362
363 fit_region_make_list(fit, fdt_regions, count, region);
364 if (info.crypto->verify(&info, region, count, fit_value,
365 fit_value_len)) {
366 *err_msgp = "Verification failed";
367 return -1;
368 }
369
370 return 0;
371}
372
373static int fit_config_verify_sig(const void *fit, int conf_noffset,
374 const void *sig_blob, int sig_offset)
375{
376 int noffset;
377 char *err_msg = "";
378 int verified = 0;
379 int ret;
380
381 /* Process all hash subnodes of the component conf node */
382 fdt_for_each_subnode(noffset, fit, conf_noffset) {
383 const char *name = fit_get_name(fit, noffset, NULL);
384
385 if (!strncmp(name, FIT_SIG_NODENAME,
386 strlen(FIT_SIG_NODENAME))) {
387 ret = fit_config_check_sig(fit, noffset, sig_offset,
Tom Rini1f47e2a2020-04-07 11:58:44 -0400388 conf_noffset, &err_msg);
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900389 if (ret) {
390 puts("- ");
391 } else {
392 puts("+ ");
393 verified = 1;
394 break;
395 }
396 }
397 }
398
399 if (noffset == -FDT_ERR_TRUNCATED || noffset == -FDT_ERR_BADSTRUCTURE) {
400 err_msg = "Corrupted or truncated tree";
401 goto error;
402 }
403
Tom Rini1f47e2a2020-04-07 11:58:44 -0400404 if (verified)
405 return 0;
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900406
407error:
408 printf(" error!\n%s for '%s' hash node in '%s' config node\n",
409 err_msg, fit_get_name(fit, noffset, NULL),
410 fit_get_name(fit, conf_noffset, NULL));
Tom Rini1f47e2a2020-04-07 11:58:44 -0400411 return -EPERM;
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900412}
413
414int fit_config_verify_required_sigs(const void *fit, int conf_noffset,
415 const void *sig_blob)
416{
417 int noffset;
418 int sig_node;
419
420 /* Work out what we need to verify */
421 sig_node = fdt_subnode_offset(sig_blob, 0, FIT_SIG_NODENAME);
422 if (sig_node < 0) {
423 debug("%s: No signature node found: %s\n", __func__,
424 fdt_strerror(sig_node));
425 return 0;
426 }
427
428 fdt_for_each_subnode(noffset, sig_blob, sig_node) {
429 const char *required;
430 int ret;
431
Tom Rini1f47e2a2020-04-07 11:58:44 -0400432 required = fdt_getprop(sig_blob, noffset, FIT_KEY_REQUIRED,
433 NULL);
AKASHI Takahirob983cc22020-02-21 15:12:55 +0900434 if (!required || strcmp(required, "conf"))
435 continue;
436 ret = fit_config_verify_sig(fit, conf_noffset, sig_blob,
437 noffset);
438 if (ret) {
439 printf("Failed to verify required signature '%s'\n",
440 fit_get_name(sig_blob, noffset, NULL));
441 return ret;
442 }
443 }
444
445 return 0;
446}
447
448int fit_config_verify(const void *fit, int conf_noffset)
449{
450 return fit_config_verify_required_sigs(fit, conf_noffset,
451 gd_fdt_blob());
452}