aboutsummaryrefslogtreecommitdiff
path: root/cmd/avb.c
blob: 8fbd48ee5a215d4887b22949461d24aba99e0a5b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
// SPDX-License-Identifier: GPL-2.0+
/*
 * (C) Copyright 2018, Linaro Limited
 */

#include <avb_verify.h>
#include <command.h>
#include <env.h>
#include <image.h>
#include <malloc.h>
#include <mmc.h>

#define AVB_BOOTARGS	"avb_bootargs"

static struct AvbOps *avb_ops;

int do_avb_init(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
	unsigned long mmc_dev;

	if (argc != 2)
		return CMD_RET_USAGE;

	mmc_dev = hextoul(argv[1], NULL);

	if (avb_ops)
		avb_ops_free(avb_ops);

	avb_ops = avb_ops_alloc(mmc_dev);
	if (avb_ops)
		return CMD_RET_SUCCESS;
	else
		printf("Can't allocate AvbOps");

	printf("Failed to initialize AVB\n");

	return CMD_RET_FAILURE;
}

int do_avb_read_part(struct cmd_tbl *cmdtp, int flag, int argc,
		     char *const argv[])
{
	const char *part;
	s64 offset;
	size_t bytes, bytes_read = 0;
	void *buffer;
	int ret;

	if (!avb_ops) {
		printf("AVB is not initialized, please run 'avb init <id>'\n");
		return CMD_RET_FAILURE;
	}

	if (argc != 5)
		return CMD_RET_USAGE;

	part = argv[1];
	offset = hextoul(argv[2], NULL);
	bytes = hextoul(argv[3], NULL);
	buffer = (void *)hextoul(argv[4], NULL);

	ret = avb_ops->read_from_partition(avb_ops, part, offset,
					   bytes, buffer, &bytes_read);
	if (ret == AVB_IO_RESULT_OK) {
		printf("Read %zu bytes\n", bytes_read);
		return CMD_RET_SUCCESS;
	}

	printf("Failed to read from partition '%s', err = %d\n",
	       part, ret);

	return CMD_RET_FAILURE;
}

int do_avb_read_part_hex(struct cmd_tbl *cmdtp, int flag, int argc,
			 char *const argv[])
{
	const char *part;
	s64 offset;
	size_t bytes, bytes_read = 0;
	char *buffer;
	int ret;

	if (!avb_ops) {
		printf("AVB is not initialized, please run 'avb init <id>'\n");
		return CMD_RET_FAILURE;
	}

	if (argc != 4)
		return CMD_RET_USAGE;

	part = argv[1];
	offset = hextoul(argv[2], NULL);
	bytes = hextoul(argv[3], NULL);

	buffer = malloc(bytes);
	if (!buffer) {
		printf("Failed to tlb_allocate buffer for data\n");
		return CMD_RET_FAILURE;
	}
	memset(buffer, 0, bytes);

	ret = avb_ops->read_from_partition(avb_ops, part, offset,
					   bytes, buffer, &bytes_read);
	if (ret == AVB_IO_RESULT_OK) {
		printf("Requested %zu, read %zu bytes\n", bytes, bytes_read);
		printf("Data: ");
		for (int i = 0; i < bytes_read; i++)
			printf("%02X", buffer[i]);

		printf("\n");

		free(buffer);
		return CMD_RET_SUCCESS;
	}

	printf("Failed to read from partition '%s', err = %d\n",
	       part, ret);

	free(buffer);
	return CMD_RET_FAILURE;
}

int do_avb_write_part(struct cmd_tbl *cmdtp, int flag, int argc,
		      char *const argv[])
{
	const char *part;
	s64 offset;
	size_t bytes;
	void *buffer;
	int ret;

	if (!avb_ops) {
		printf("AVB is not initialized, please run 'avb init <id>'\n");
		return CMD_RET_FAILURE;
	}

	if (argc != 5)
		return CMD_RET_USAGE;

	part = argv[1];
	offset = hextoul(argv[2], NULL);
	bytes = hextoul(argv[3], NULL);
	buffer = (void *)hextoul(argv[4], NULL);

	ret = avb_ops->write_to_partition(avb_ops, part, offset,
					  bytes, buffer);
	if (ret == AVB_IO_RESULT_OK) {
		printf("Wrote %zu bytes\n", bytes);
		return CMD_RET_SUCCESS;
	}

	printf("Failed to write in partition '%s', err = %d\n",
	       part, ret);

	return CMD_RET_FAILURE;
}

int do_avb_read_rb(struct cmd_tbl *cmdtp, int flag, int argc,
		   char *const argv[])
{
	size_t index;
	u64 rb_idx;
	int ret;

	if (!avb_ops) {
		printf("AVB is not initialized, please run 'avb init <id>'\n");
		return CMD_RET_FAILURE;
	}

	if (argc != 2)
		return CMD_RET_USAGE;

	index = (size_t)hextoul(argv[1], NULL);

	ret = avb_ops->read_rollback_index(avb_ops, index, &rb_idx);
	if (ret == AVB_IO_RESULT_OK) {
		printf("Rollback index: %llx\n", rb_idx);
		return CMD_RET_SUCCESS;
	}

	printf("Failed to read rollback index id = %zu, err = %d\n",
	       index, ret);

	return CMD_RET_FAILURE;
}

int do_avb_write_rb(struct cmd_tbl *cmdtp, int flag, int argc,
		    char *const argv[])
{
	size_t index;
	u64 rb_idx;
	int ret;

	if (!avb_ops) {
		printf("AVB is not initialized, please run 'avb init <id>'\n");
		return CMD_RET_FAILURE;
	}

	if (argc != 3)
		return CMD_RET_USAGE;

	index = (size_t)hextoul(argv[1], NULL);
	rb_idx = hextoul(argv[2], NULL);

	ret = avb_ops->write_rollback_index(avb_ops, index, rb_idx);
	if (ret == AVB_IO_RESULT_OK)
		return CMD_RET_SUCCESS;

	printf("Failed to write rollback index id = %zu, err = %d\n",
	       index, ret);

	return CMD_RET_FAILURE;
}

int do_avb_get_uuid(struct cmd_tbl *cmdtp, int flag,
		    int argc, char *const argv[])
{
	const char *part;
	char buffer[UUID_STR_LEN + 1];
	int ret;

	if (!avb_ops) {
		printf("AVB is not initialized, please run 'avb init <id>'\n");
		return CMD_RET_FAILURE;
	}

	if (argc != 2)
		return CMD_RET_USAGE;

	part = argv[1];

	ret = avb_ops->get_unique_guid_for_partition(avb_ops, part,
						     buffer,
						     UUID_STR_LEN + 1);
	if (ret == AVB_IO_RESULT_OK) {
		printf("'%s' UUID: %s\n", part, buffer);
		return CMD_RET_SUCCESS;
	}

	printf("Failed to read partition '%s' UUID, err = %d\n",
	       part, ret);

	return CMD_RET_FAILURE;
}

int do_avb_verify_part(struct cmd_tbl *cmdtp, int flag,
		       int argc, char *const argv[])
{
	const char * const requested_partitions[] = {"boot", NULL};
	AvbSlotVerifyResult slot_result;
	AvbSlotVerifyData *out_data;
	enum avb_boot_state boot_state;
	char *cmdline;
	char *extra_args;
	char *slot_suffix = "";
	int ret;

	bool unlocked = false;
	int res = CMD_RET_FAILURE;

	if (!avb_ops) {
		printf("AVB is not initialized, please run 'avb init <id>'\n");
		return CMD_RET_FAILURE;
	}

	if (argc < 1 || argc > 2)
		return CMD_RET_USAGE;

	if (argc == 2)
		slot_suffix = argv[1];

	printf("## Android Verified Boot 2.0 version %s\n",
	       avb_version_string());

	ret = avb_ops->read_is_device_unlocked(avb_ops, &unlocked);
	if (ret != AVB_IO_RESULT_OK) {
		printf("Can't determine device lock state, err = %d\n",
		       ret);
		return CMD_RET_FAILURE;
	}

	slot_result =
		avb_slot_verify(avb_ops,
				requested_partitions,
				slot_suffix,
				unlocked,
				AVB_HASHTREE_ERROR_MODE_RESTART_AND_INVALIDATE,
				&out_data);

	/*
	 * LOCKED devices with custom root of trust setup is not supported (YELLOW)
	 */
	if (slot_result == AVB_SLOT_VERIFY_RESULT_OK) {
		printf("Verification passed successfully\n");

		/*
		 * ORANGE state indicates that device may be freely modified.
		 * Device integrity is left to the user to verify out-of-band.
		 */
		if (unlocked)
			boot_state = AVB_ORANGE;
		else
			boot_state = AVB_GREEN;

		/* export boot state to AVB_BOOTARGS env var */
		extra_args = avb_set_state(avb_ops, boot_state);
		if (extra_args)
			cmdline = append_cmd_line(out_data->cmdline,
						  extra_args);
		else
			cmdline = out_data->cmdline;

		env_set(AVB_BOOTARGS, cmdline);

		res = CMD_RET_SUCCESS;
	} else {
		printf("Verification failed, reason: %s\n", str_avb_slot_error(slot_result));
	}

	if (out_data)
		avb_slot_verify_data_free(out_data);

	return res;
}

int do_avb_is_unlocked(struct cmd_tbl *cmdtp, int flag,
		       int argc, char *const argv[])
{
	bool unlock;
	int ret;

	if (!avb_ops) {
		printf("AVB is not initialized, please run 'avb init <id>'\n");
		return CMD_RET_FAILURE;
	}

	if (argc != 1) {
		printf("--%s(-1)\n", __func__);
		return CMD_RET_USAGE;
	}

	ret = avb_ops->read_is_device_unlocked(avb_ops, &unlock);
	if (ret == AVB_IO_RESULT_OK) {
		printf("Unlocked = %d\n", unlock);
		return CMD_RET_SUCCESS;
	}

	printf("Can't determine device lock state, err = %d\n",
	       ret);

	return CMD_RET_FAILURE;
}

int do_avb_read_pvalue(struct cmd_tbl *cmdtp, int flag, int argc,
		       char *const argv[])
{
	const char *name;
	size_t bytes;
	size_t bytes_read;
	void *buffer;
	char *endp;
	int ret;

	if (!avb_ops) {
		printf("AVB is not initialized, please run 'avb init <id>'\n");
		return CMD_RET_FAILURE;
	}

	if (argc != 3)
		return CMD_RET_USAGE;

	name = argv[1];
	bytes = dectoul(argv[2], &endp);
	if (*endp && *endp != '\n')
		return CMD_RET_USAGE;

	buffer = malloc(bytes);
	if (!buffer)
		return CMD_RET_FAILURE;

	ret = avb_ops->read_persistent_value(avb_ops, name, bytes,
					     buffer, &bytes_read);
	if (ret == AVB_IO_RESULT_OK) {
		printf("Read %zu bytes, value = %s\n", bytes_read,
		       (char *)buffer);
		free(buffer);
		return CMD_RET_SUCCESS;
	}

	printf("Failed to read persistent value, err = %d\n", ret);

	free(buffer);

	return CMD_RET_FAILURE;
}

int do_avb_write_pvalue(struct cmd_tbl *cmdtp, int flag, int argc,
			char *const argv[])
{
	const char *name;
	const char *value;
	int ret;

	if (!avb_ops) {
		printf("AVB is not initialized, please run 'avb init <id>'\n");
		return CMD_RET_FAILURE;
	}

	if (argc != 3)
		return CMD_RET_USAGE;

	name = argv[1];
	value = argv[2];

	ret = avb_ops->write_persistent_value(avb_ops, name,
					      strlen(value) + 1,
					      (const uint8_t *)value);
	if (ret == AVB_IO_RESULT_OK) {
		printf("Wrote %zu bytes\n", strlen(value) + 1);
		return CMD_RET_SUCCESS;
	}

	printf("Failed to write persistent value `%s` = `%s`, err = %d\n",
	       name, value, ret);

	return CMD_RET_FAILURE;
}

static struct cmd_tbl cmd_avb[] = {
	U_BOOT_CMD_MKENT(init, 2, 0, do_avb_init, "", ""),
	U_BOOT_CMD_MKENT(read_rb, 2, 0, do_avb_read_rb, "", ""),
	U_BOOT_CMD_MKENT(write_rb, 3, 0, do_avb_write_rb, "", ""),
	U_BOOT_CMD_MKENT(is_unlocked, 1, 0, do_avb_is_unlocked, "", ""),
	U_BOOT_CMD_MKENT(get_uuid, 2, 0, do_avb_get_uuid, "", ""),
	U_BOOT_CMD_MKENT(read_part, 5, 0, do_avb_read_part, "", ""),
	U_BOOT_CMD_MKENT(read_part_hex, 4, 0, do_avb_read_part_hex, "", ""),
	U_BOOT_CMD_MKENT(write_part, 5, 0, do_avb_write_part, "", ""),
	U_BOOT_CMD_MKENT(verify, 2, 0, do_avb_verify_part, "", ""),
#ifdef CONFIG_OPTEE_TA_AVB
	U_BOOT_CMD_MKENT(read_pvalue, 3, 0, do_avb_read_pvalue, "", ""),
	U_BOOT_CMD_MKENT(write_pvalue, 3, 0, do_avb_write_pvalue, "", ""),
#endif
};

static int do_avb(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
{
	struct cmd_tbl *cp;

	cp = find_cmd_tbl(argv[1], cmd_avb, ARRAY_SIZE(cmd_avb));

	argc--;
	argv++;

	if (!cp || argc > cp->maxargs)
		return CMD_RET_USAGE;

	if (flag == CMD_FLAG_REPEAT)
		return CMD_RET_FAILURE;

	return cp->cmd(cmdtp, flag, argc, argv);
}

U_BOOT_CMD(
	avb, 29, 0, do_avb,
	"Provides commands for testing Android Verified Boot 2.0 functionality",
	"init <dev> - initialize avb2 for <dev>\n"
	"avb read_rb <num> - read rollback index at location <num>\n"
	"avb write_rb <num> <rb> - write rollback index <rb> to <num>\n"
	"avb is_unlocked - returns unlock status of the device\n"
	"avb get_uuid <partname> - read and print uuid of partition <part>\n"
	"avb read_part <partname> <offset> <num> <addr> - read <num> bytes from\n"
	"    partition <partname> to buffer <addr>\n"
	"avb read_part_hex <partname> <offset> <num> - read <num> bytes from\n"
	"    partition <partname> and print to stdout\n"
	"avb write_part <partname> <offset> <num> <addr> - write <num> bytes to\n"
	"    <partname> by <offset> using data from <addr>\n"
#ifdef CONFIG_OPTEE_TA_AVB
	"avb read_pvalue <name> <bytes> - read a persistent value <name>\n"
	"avb write_pvalue <name> <value> - write a persistent value <name>\n"
#endif
	"avb verify [slot_suffix] - run verification process using hash data\n"
	"    from vbmeta structure\n"
	"    [slot_suffix] - _a, _b, etc (if vbmeta partition is slotted)\n"
	);