summaryrefslogtreecommitdiffstats
path: root/cmd/tpm-v2.c
blob: daae91100a2bb41b65efb288365d5f62e7b2602f (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
// SPDX-License-Identifier: GPL-2.0+
/*
 * Copyright (c) 2018 Bootlin
 * Author: Miquel Raynal <miquel.raynal@bootlin.com>
 */

#include <common.h>
#include <command.h>
#include <dm.h>
#include <log.h>
#include <mapmem.h>
#include <tpm-common.h>
#include <tpm-v2.h>
#include "tpm-user-utils.h"

static int do_tpm2_startup(struct cmd_tbl *cmdtp, int flag, int argc,
			   char *const argv[])
{
	enum tpm2_startup_types mode;
	struct udevice *dev;
	int ret;

	ret = get_tpm(&dev);
	if (ret)
		return ret;
	if (argc != 2)
		return CMD_RET_USAGE;

	if (!strcasecmp("TPM2_SU_CLEAR", argv[1])) {
		mode = TPM2_SU_CLEAR;
	} else if (!strcasecmp("TPM2_SU_STATE", argv[1])) {
		mode = TPM2_SU_STATE;
	} else {
		printf("Couldn't recognize mode string: %s\n", argv[1]);
		return CMD_RET_FAILURE;
	}

	return report_return_code(tpm2_startup(dev, mode));
}

static int do_tpm2_self_test(struct cmd_tbl *cmdtp, int flag, int argc,
			     char *const argv[])
{
	enum tpm2_yes_no full_test;
	struct udevice *dev;
	int ret;

	ret = get_tpm(&dev);
	if (ret)
		return ret;
	if (argc != 2)
		return CMD_RET_USAGE;

	if (!strcasecmp("full", argv[1])) {
		full_test = TPMI_YES;
	} else if (!strcasecmp("continue", argv[1])) {
		full_test = TPMI_NO;
	} else {
		printf("Couldn't recognize test mode: %s\n", argv[1]);
		return CMD_RET_FAILURE;
	}

	return report_return_code(tpm2_self_test(dev, full_test));
}

static int do_tpm2_clear(struct cmd_tbl *cmdtp, int flag, int argc,
			 char *const argv[])
{
	u32 handle = 0;
	const char *pw = (argc < 3) ? NULL : argv[2];
	const ssize_t pw_sz = pw ? strlen(pw) : 0;
	struct udevice *dev;
	int ret;

	ret = get_tpm(&dev);
	if (ret)
		return ret;

	if (argc < 2 || argc > 3)
		return CMD_RET_USAGE;

	if (pw_sz > TPM2_DIGEST_LEN)
		return -EINVAL;

	if (!strcasecmp("TPM2_RH_LOCKOUT", argv[1]))
		handle = TPM2_RH_LOCKOUT;
	else if (!strcasecmp("TPM2_RH_PLATFORM", argv[1]))
		handle = TPM2_RH_PLATFORM;
	else
		return CMD_RET_USAGE;

	return report_return_code(tpm2_clear(dev, handle, pw, pw_sz));
}

static int do_tpm2_pcr_extend(struct cmd_tbl *cmdtp, int flag, int argc,
			      char *const argv[])
{
	struct udevice *dev;
	struct tpm_chip_priv *priv;
	u32 index = simple_strtoul(argv[1], NULL, 0);
	void *digest = map_sysmem(simple_strtoul(argv[2], NULL, 0), 0);
	int ret;
	u32 rc;

	if (argc != 3)
		return CMD_RET_USAGE;

	ret = get_tpm(&dev);
	if (ret)
		return ret;

	priv = dev_get_uclass_priv(dev);
	if (!priv)
		return -EINVAL;

	if (index >= priv->pcr_count)
		return -EINVAL;

	rc = tpm2_pcr_extend(dev, index, TPM2_ALG_SHA256, digest,
			     TPM2_DIGEST_LEN);

	unmap_sysmem(digest);

	return report_return_code(rc);
}

static int do_tpm_pcr_read(struct cmd_tbl *cmdtp, int flag, int argc,
			   char *const argv[])
{
	struct udevice *dev;
	struct tpm_chip_priv *priv;
	u32 index, rc;
	unsigned int updates;
	void *data;
	int ret;

	if (argc != 3)
		return CMD_RET_USAGE;

	ret = get_tpm(&dev);
	if (ret)
		return ret;

	priv = dev_get_uclass_priv(dev);
	if (!priv)
		return -EINVAL;

	index = simple_strtoul(argv[1], NULL, 0);
	if (index >= priv->pcr_count)
		return -EINVAL;

	data = map_sysmem(simple_strtoul(argv[2], NULL, 0), 0);

	rc = tpm2_pcr_read(dev, index, priv->pcr_select_min, data, &updates);
	if (!rc) {
		printf("PCR #%u content (%u known updates):\n", index, updates);
		print_byte_string(data, TPM2_DIGEST_LEN);
	}

	unmap_sysmem(data);

	return report_return_code(rc);
}

static int do_tpm_get_capability(struct cmd_tbl *cmdtp, int flag, int argc,
				 char *const argv[])
{
	u32 capability, property, rc;
	u8 *data;
	size_t count;
	int i, j;
	struct udevice *dev;
	int ret;

	ret = get_tpm(&dev);
	if (ret)
		return ret;

	if (argc != 5)
		return CMD_RET_USAGE;

	capability = simple_strtoul(argv[1], NULL, 0);
	property = simple_strtoul(argv[2], NULL, 0);
	data = map_sysmem(simple_strtoul(argv[3], NULL, 0), 0);
	count = simple_strtoul(argv[4], NULL, 0);

	rc = tpm2_get_capability(dev, capability, property, data, count);
	if (rc)
		goto unmap_data;

	printf("Capabilities read from TPM:\n");
	for (i = 0; i < count; i++) {
		printf("Property 0x");
		for (j = 0; j < 4; j++)
			printf("%02x", data[(i * 8) + j + sizeof(u32)]);
		printf(": 0x");
		for (j = 4; j < 8; j++)
			printf("%02x", data[(i * 8) + j + sizeof(u32)]);
		printf("\n");
	}

unmap_data:
	unmap_sysmem(data);

	return report_return_code(rc);
}

static int do_tpm_dam_reset(struct cmd_tbl *cmdtp, int flag, int argc,
			    char *const argv[])
{
	const char *pw = (argc < 2) ? NULL : argv[1];
	const ssize_t pw_sz = pw ? strlen(pw) : 0;
	struct udevice *dev;
	int ret;

	ret = get_tpm(&dev);
	if (ret)
		return ret;

	if (argc > 2)
		return CMD_RET_USAGE;

	if (pw_sz > TPM2_DIGEST_LEN)
		return -EINVAL;

	return report_return_code(tpm2_dam_reset(dev, pw, pw_sz));
}

static int do_tpm_dam_parameters(struct cmd_tbl *cmdtp, int flag, int argc,
				 char *const argv[])
{
	const char *pw = (argc < 5) ? NULL : argv[4];
	const ssize_t pw_sz = pw ? strlen(pw) : 0;
	/*
	 * No Dictionary Attack Mitigation (DAM) means:
	 * maxtries = 0xFFFFFFFF, recovery_time = 1, lockout_recovery = 0
	 */
	unsigned long int max_tries;
	unsigned long int recovery_time;
	unsigned long int lockout_recovery;
	struct udevice *dev;
	int ret;

	ret = get_tpm(&dev);
	if (ret)
		return ret;

	if (argc < 4 || argc > 5)
		return CMD_RET_USAGE;

	if (pw_sz > TPM2_DIGEST_LEN)
		return -EINVAL;

	if (strict_strtoul(argv[1], 0, &max_tries))
		return CMD_RET_USAGE;

	if (strict_strtoul(argv[2], 0, &recovery_time))
		return CMD_RET_USAGE;

	if (strict_strtoul(argv[3], 0, &lockout_recovery))
		return CMD_RET_USAGE;

	log(LOGC_NONE, LOGL_INFO, "Changing dictionary attack parameters:\n");
	log(LOGC_NONE, LOGL_INFO, "- maxTries: %lu", max_tries);
	log(LOGC_NONE, LOGL_INFO, "- recoveryTime: %lu\n", recovery_time);
	log(LOGC_NONE, LOGL_INFO, "- lockoutRecovery: %lu\n", lockout_recovery);

	return report_return_code(tpm2_dam_parameters(dev, pw, pw_sz, max_tries,
						      recovery_time,
						      lockout_recovery));
}

static int do_tpm_change_auth(struct cmd_tbl *cmdtp, int flag, int argc,
			      char *const argv[])
{
	u32 handle;
	const char *newpw = argv[2];
	const char *oldpw = (argc == 3) ? NULL : argv[3];
	const ssize_t newpw_sz = strlen(newpw);
	const ssize_t oldpw_sz = oldpw ? strlen(oldpw) : 0;
	struct udevice *dev;
	int ret;

	ret = get_tpm(&dev);
	if (ret)
		return ret;

	if (argc < 3 || argc > 4)
		return CMD_RET_USAGE;

	if (newpw_sz > TPM2_DIGEST_LEN || oldpw_sz > TPM2_DIGEST_LEN)
		return -EINVAL;

	if (!strcasecmp("TPM2_RH_LOCKOUT", argv[1]))
		handle = TPM2_RH_LOCKOUT;
	else if (!strcasecmp("TPM2_RH_ENDORSEMENT", argv[1]))
		handle = TPM2_RH_ENDORSEMENT;
	else if (!strcasecmp("TPM2_RH_OWNER", argv[1]))
		handle = TPM2_RH_OWNER;
	else if (!strcasecmp("TPM2_RH_PLATFORM", argv[1]))
		handle = TPM2_RH_PLATFORM;
	else
		return CMD_RET_USAGE;

	return report_return_code(tpm2_change_auth(dev, handle, newpw, newpw_sz,
						   oldpw, oldpw_sz));
}

static int do_tpm_pcr_setauthpolicy(struct cmd_tbl *cmdtp, int flag, int argc,
				    char *const argv[])
{
	u32 index = simple_strtoul(argv[1], NULL, 0);
	char *key = argv[2];
	const char *pw = (argc < 4) ? NULL : argv[3];
	const ssize_t pw_sz = pw ? strlen(pw) : 0;
	struct udevice *dev;
	int ret;

	ret = get_tpm(&dev);
	if (ret)
		return ret;

	if (strlen(key) != TPM2_DIGEST_LEN)
		return -EINVAL;

	if (argc < 3 || argc > 4)
		return CMD_RET_USAGE;

	return report_return_code(tpm2_pcr_setauthpolicy(dev, pw, pw_sz, index,
							 key));
}

static int do_tpm_pcr_setauthvalue(struct cmd_tbl *cmdtp, int flag,
				   int argc, char *const argv[])
{
	u32 index = simple_strtoul(argv[1], NULL, 0);
	char *key = argv[2];
	const ssize_t key_sz = strlen(key);
	const char *pw = (argc < 4) ? NULL : argv[3];
	const ssize_t pw_sz = pw ? strlen(pw) : 0;
	struct udevice *dev;
	int ret;

	ret = get_tpm(&dev);
	if (ret)
		return ret;

	if (strlen(key) != TPM2_DIGEST_LEN)
		return -EINVAL;

	if (argc < 3 || argc > 4)
		return CMD_RET_USAGE;

	return report_return_code(tpm2_pcr_setauthvalue(dev, pw, pw_sz, index,
							key, key_sz));
}

static struct cmd_tbl tpm2_commands[] = {
	U_BOOT_CMD_MKENT(device, 0, 1, do_tpm_device, "", ""),
	U_BOOT_CMD_MKENT(info, 0, 1, do_tpm_info, "", ""),
	U_BOOT_CMD_MKENT(init, 0, 1, do_tpm_init, "", ""),
	U_BOOT_CMD_MKENT(startup, 0, 1, do_tpm2_startup, "", ""),
	U_BOOT_CMD_MKENT(self_test, 0, 1, do_tpm2_self_test, "", ""),
	U_BOOT_CMD_MKENT(clear, 0, 1, do_tpm2_clear, "", ""),
	U_BOOT_CMD_MKENT(pcr_extend, 0, 1, do_tpm2_pcr_extend, "", ""),
	U_BOOT_CMD_MKENT(pcr_read, 0, 1, do_tpm_pcr_read, "", ""),
	U_BOOT_CMD_MKENT(get_capability, 0, 1, do_tpm_get_capability, "", ""),
	U_BOOT_CMD_MKENT(dam_reset, 0, 1, do_tpm_dam_reset, "", ""),
	U_BOOT_CMD_MKENT(dam_parameters, 0, 1, do_tpm_dam_parameters, "", ""),
	U_BOOT_CMD_MKENT(change_auth, 0, 1, do_tpm_change_auth, "", ""),
	U_BOOT_CMD_MKENT(pcr_setauthpolicy, 0, 1,
			 do_tpm_pcr_setauthpolicy, "", ""),
	U_BOOT_CMD_MKENT(pcr_setauthvalue, 0, 1,
			 do_tpm_pcr_setauthvalue, "", ""),
};

struct cmd_tbl *get_tpm2_commands(unsigned int *size)
{
	*size = ARRAY_SIZE(tpm2_commands);

	return tpm2_commands;
}

U_BOOT_CMD(tpm2, CONFIG_SYS_MAXARGS, 1, do_tpm, "Issue a TPMv2.x command",
"<command> [<arguments>]\n"
"\n"
"device [num device]\n"
"    Show all devices or set the specified device\n"
"info\n"
"    Show information about the TPM.\n"
"init\n"
"    Initialize the software stack. Always the first command to issue.\n"
"startup <mode>\n"
"    Issue a TPM2_Startup command.\n"
"    <mode> is one of:\n"
"        * TPM2_SU_CLEAR (reset state)\n"
"        * TPM2_SU_STATE (preserved state)\n"
"self_test <type>\n"
"    Test the TPM capabilities.\n"
"    <type> is one of:\n"
"        * full (perform all tests)\n"
"        * continue (only check untested tests)\n"
"clear <hierarchy>\n"
"    Issue a TPM2_Clear command.\n"
"    <hierarchy> is one of:\n"
"        * TPM2_RH_LOCKOUT\n"
"        * TPM2_RH_PLATFORM\n"
"pcr_extend <pcr> <digest_addr>\n"
"    Extend PCR #<pcr> with digest at <digest_addr>.\n"
"    <pcr>: index of the PCR\n"
"    <digest_addr>: address of a 32-byte SHA256 digest\n"
"pcr_read <pcr> <digest_addr>\n"
"    Read PCR #<pcr> to memory address <digest_addr>.\n"
"    <pcr>: index of the PCR\n"
"    <digest_addr>: address to store the a 32-byte SHA256 digest\n"
"get_capability <capability> <property> <addr> <count>\n"
"    Read and display <count> entries indexed by <capability>/<property>.\n"
"    Values are 4 bytes long and are written at <addr>.\n"
"    <capability>: capability\n"
"    <property>: property\n"
"    <addr>: address to store <count> entries of 4 bytes\n"
"    <count>: number of entries to retrieve\n"
"dam_reset [<password>]\n"
"    If the TPM is not in a LOCKOUT state, reset the internal error counter.\n"
"    <password>: optional password\n"
"dam_parameters <max_tries> <recovery_time> <lockout_recovery> [<password>]\n"
"    If the TPM is not in a LOCKOUT state, set the DAM parameters\n"
"    <maxTries>: maximum number of failures before lockout,\n"
"                0 means always locking\n"
"    <recoveryTime>: time before decrement of the error counter,\n"
"                    0 means no lockout\n"
"    <lockoutRecovery>: time of a lockout (before the next try),\n"
"                       0 means a reboot is needed\n"
"    <password>: optional password of the LOCKOUT hierarchy\n"
"change_auth <hierarchy> <new_pw> [<old_pw>]\n"
"    <hierarchy>: the hierarchy\n"
"    <new_pw>: new password for <hierarchy>\n"
"    <old_pw>: optional previous password of <hierarchy>\n"
"pcr_setauthpolicy|pcr_setauthvalue <pcr> <key> [<password>]\n"
"    Change the <key> to access PCR #<pcr>.\n"
"    hierarchy and may be empty.\n"
"    /!\\WARNING: untested function, use at your own risks !\n"
"    <pcr>: index of the PCR\n"
"    <key>: secret to protect the access of PCR #<pcr>\n"
"    <password>: optional password of the PLATFORM hierarchy\n"
);