aboutsummaryrefslogtreecommitdiff
path: root/include/linux/tpm.h
blob: 03e9b184411bee44d8be375bbcaefff5f72509a2 (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
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2004,2007,2008 IBM Corporation
 *
 * Authors:
 * Leendert van Doorn <leendert@watson.ibm.com>
 * Dave Safford <safford@watson.ibm.com>
 * Reiner Sailer <sailer@watson.ibm.com>
 * Kylene Hall <kjhall@us.ibm.com>
 * Debora Velarde <dvelarde@us.ibm.com>
 *
 * Maintained by: <tpmdd_devel@lists.sourceforge.net>
 *
 * Device driver for TCG/TCPA TPM (trusted platform module).
 * Specifications at www.trustedcomputinggroup.org
 */
#ifndef __LINUX_TPM_H__
#define __LINUX_TPM_H__

#include <linux/hw_random.h>
#include <linux/acpi.h>
#include <linux/cdev.h>
#include <linux/fs.h>
#include <linux/highmem.h>
#include <crypto/hash_info.h>

#define TPM_DIGEST_SIZE 20	/* Max TPM v1.2 PCR size */
#define TPM_MAX_DIGEST_SIZE SHA512_DIGEST_SIZE

struct tpm_chip;
struct trusted_key_payload;
struct trusted_key_options;

enum tpm_algorithms {
	TPM_ALG_ERROR		= 0x0000,
	TPM_ALG_SHA1		= 0x0004,
	TPM_ALG_KEYEDHASH	= 0x0008,
	TPM_ALG_SHA256		= 0x000B,
	TPM_ALG_SHA384		= 0x000C,
	TPM_ALG_SHA512		= 0x000D,
	TPM_ALG_NULL		= 0x0010,
	TPM_ALG_SM3_256		= 0x0012,
};

struct tpm_digest {
	u16 alg_id;
	u8 digest[TPM_MAX_DIGEST_SIZE];
} __packed;

struct tpm_bank_info {
	u16 alg_id;
	u16 digest_size;
	u16 crypto_id;
};

enum TPM_OPS_FLAGS {
	TPM_OPS_AUTO_STARTUP = BIT(0),
};

struct tpm_class_ops {
	unsigned int flags;
	const u8 req_complete_mask;
	const u8 req_complete_val;
	bool (*req_canceled)(struct tpm_chip *chip, u8 status);
	int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len);
	int (*send) (struct tpm_chip *chip, u8 *buf, size_t len);
	void (*cancel) (struct tpm_chip *chip);
	u8 (*status) (struct tpm_chip *chip);
	void (*update_timeouts)(struct tpm_chip *chip,
				unsigned long *timeout_cap);
	void (*update_durations)(struct tpm_chip *chip,
				 unsigned long *duration_cap);
	int (*go_idle)(struct tpm_chip *chip);
	int (*cmd_ready)(struct tpm_chip *chip);
	int (*request_locality)(struct tpm_chip *chip, int loc);
	int (*relinquish_locality)(struct tpm_chip *chip, int loc);
	void (*clk_enable)(struct tpm_chip *chip, bool value);
};

#define TPM_NUM_EVENT_LOG_FILES		3

/* Indexes the duration array */
enum tpm_duration {
	TPM_SHORT = 0,
	TPM_MEDIUM = 1,
	TPM_LONG = 2,
	TPM_LONG_LONG = 3,
	TPM_UNDEFINED,
	TPM_NUM_DURATIONS = TPM_UNDEFINED,
};

#define TPM_PPI_VERSION_LEN		3

struct tpm_space {
	u32 context_tbl[3];
	u8 *context_buf;
	u32 session_tbl[3];
	u8 *session_buf;
};

struct tpm_bios_log {
	void *bios_event_log;
	void *bios_event_log_end;
};

struct tpm_chip_seqops {
	struct tpm_chip *chip;
	const struct seq_operations *seqops;
};

struct tpm_chip {
	struct device dev;
	struct device devs;
	struct cdev cdev;
	struct cdev cdevs;

	/* A driver callback under ops cannot be run unless ops_sem is held
	 * (sometimes implicitly, eg for the sysfs code). ops becomes null
	 * when the driver is unregistered, see tpm_try_get_ops.
	 */
	struct rw_semaphore ops_sem;
	const struct tpm_class_ops *ops;

	struct tpm_bios_log log;
	struct tpm_chip_seqops bin_log_seqops;
	struct tpm_chip_seqops ascii_log_seqops;

	unsigned int flags;

	int dev_num;		/* /dev/tpm# */
	unsigned long is_open;	/* only one allowed */

	char hwrng_name[64];
	struct hwrng hwrng;

	struct mutex tpm_mutex;	/* tpm is processing */

	unsigned long timeout_a; /* jiffies */
	unsigned long timeout_b; /* jiffies */
	unsigned long timeout_c; /* jiffies */
	unsigned long timeout_d; /* jiffies */
	bool timeout_adjusted;
	unsigned long duration[TPM_NUM_DURATIONS]; /* jiffies */
	bool duration_adjusted;

	struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];

	const struct attribute_group *groups[3];
	unsigned int groups_cnt;

	u32 nr_allocated_banks;
	struct tpm_bank_info *allocated_banks;
#ifdef CONFIG_ACPI
	acpi_handle acpi_dev_handle;
	char ppi_version[TPM_PPI_VERSION_LEN + 1];
#endif /* CONFIG_ACPI */

	struct tpm_space work_space;
	u32 last_cc;
	u32 nr_commands;
	u32 *cc_attrs_tbl;

	/* active locality */
	int locality;
};

#define TPM_HEADER_SIZE		10

enum tpm2_const {
	TPM2_PLATFORM_PCR       =     24,
	TPM2_PCR_SELECT_MIN     = ((TPM2_PLATFORM_PCR + 7) / 8),
};

enum tpm2_timeouts {
	TPM2_TIMEOUT_A          =    750,
	TPM2_TIMEOUT_B          =   2000,
	TPM2_TIMEOUT_C          =    200,
	TPM2_TIMEOUT_D          =     30,
	TPM2_DURATION_SHORT     =     20,
	TPM2_DURATION_MEDIUM    =    750,
	TPM2_DURATION_LONG      =   2000,
	TPM2_DURATION_LONG_LONG = 300000,
	TPM2_DURATION_DEFAULT   = 120000,
};

enum tpm2_structures {
	TPM2_ST_NO_SESSIONS	= 0x8001,
	TPM2_ST_SESSIONS	= 0x8002,
};

/* Indicates from what layer of the software stack the error comes from */
#define TSS2_RC_LAYER_SHIFT	 16
#define TSS2_RESMGR_TPM_RC_LAYER (11 << TSS2_RC_LAYER_SHIFT)

enum tpm2_return_codes {
	TPM2_RC_SUCCESS		= 0x0000,
	TPM2_RC_HASH		= 0x0083, /* RC_FMT1 */
	TPM2_RC_HANDLE		= 0x008B,
	TPM2_RC_INITIALIZE	= 0x0100, /* RC_VER1 */
	TPM2_RC_FAILURE		= 0x0101,
	TPM2_RC_DISABLED	= 0x0120,
	TPM2_RC_COMMAND_CODE    = 0x0143,
	TPM2_RC_TESTING		= 0x090A, /* RC_WARN */
	TPM2_RC_REFERENCE_H0	= 0x0910,
	TPM2_RC_RETRY		= 0x0922,
};

enum tpm2_command_codes {
	TPM2_CC_FIRST		        = 0x011F,
	TPM2_CC_HIERARCHY_CONTROL       = 0x0121,
	TPM2_CC_HIERARCHY_CHANGE_AUTH   = 0x0129,
	TPM2_CC_CREATE_PRIMARY          = 0x0131,
	TPM2_CC_SEQUENCE_COMPLETE       = 0x013E,
	TPM2_CC_SELF_TEST	        = 0x0143,
	TPM2_CC_STARTUP		        = 0x0144,
	TPM2_CC_SHUTDOWN	        = 0x0145,
	TPM2_CC_NV_READ                 = 0x014E,
	TPM2_CC_CREATE		        = 0x0153,
	TPM2_CC_LOAD		        = 0x0157,
	TPM2_CC_SEQUENCE_UPDATE         = 0x015C,
	TPM2_CC_UNSEAL		        = 0x015E,
	TPM2_CC_CONTEXT_LOAD	        = 0x0161,
	TPM2_CC_CONTEXT_SAVE	        = 0x0162,
	TPM2_CC_FLUSH_CONTEXT	        = 0x0165,
	TPM2_CC_VERIFY_SIGNATURE        = 0x0177,
	TPM2_CC_GET_CAPABILITY	        = 0x017A,
	TPM2_CC_GET_RANDOM	        = 0x017B,
	TPM2_CC_PCR_READ	        = 0x017E,
	TPM2_CC_PCR_EXTEND	        = 0x0182,
	TPM2_CC_EVENT_SEQUENCE_COMPLETE = 0x0185,
	TPM2_CC_HASH_SEQUENCE_START     = 0x0186,
	TPM2_CC_CREATE_LOADED           = 0x0191,
	TPM2_CC_LAST		        = 0x0193, /* Spec 1.36 */
};

enum tpm2_permanent_handles {
	TPM2_RS_PW		= 0x40000009,
};

enum tpm2_capabilities {
	TPM2_CAP_HANDLES	= 1,
	TPM2_CAP_COMMANDS	= 2,
	TPM2_CAP_PCRS		= 5,
	TPM2_CAP_TPM_PROPERTIES = 6,
};

enum tpm2_properties {
	TPM_PT_TOTAL_COMMANDS	= 0x0129,
};

enum tpm2_startup_types {
	TPM2_SU_CLEAR	= 0x0000,
	TPM2_SU_STATE	= 0x0001,
};

enum tpm2_cc_attrs {
	TPM2_CC_ATTR_CHANDLES	= 25,
	TPM2_CC_ATTR_RHANDLE	= 28,
};

#define TPM_VID_INTEL    0x8086
#define TPM_VID_WINBOND  0x1050
#define TPM_VID_STM      0x104A

enum tpm_chip_flags {
	TPM_CHIP_FLAG_TPM2		= BIT(1),
	TPM_CHIP_FLAG_IRQ		= BIT(2),
	TPM_CHIP_FLAG_VIRTUAL		= BIT(3),
	TPM_CHIP_FLAG_HAVE_TIMEOUTS	= BIT(4),
	TPM_CHIP_FLAG_ALWAYS_POWERED	= BIT(5),
	TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED	= BIT(6),
};

#define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)

struct tpm_header {
	__be16 tag;
	__be32 length;
	union {
		__be32 ordinal;
		__be32 return_code;
	};
} __packed;

/* A string buffer type for constructing TPM commands. This is based on the
 * ideas of string buffer code in security/keys/trusted.h but is heap based
 * in order to keep the stack usage minimal.
 */

enum tpm_buf_flags {
	TPM_BUF_OVERFLOW	= BIT(0),
};

struct tpm_buf {
	unsigned int flags;
	u8 *data;
};

enum tpm2_object_attributes {
	TPM2_OA_USER_WITH_AUTH		= BIT(6),
};

enum tpm2_session_attributes {
	TPM2_SA_CONTINUE_SESSION	= BIT(0),
};

struct tpm2_hash {
	unsigned int crypto_id;
	unsigned int tpm_id;
};

static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal)
{
	struct tpm_header *head = (struct tpm_header *)buf->data;

	head->tag = cpu_to_be16(tag);
	head->length = cpu_to_be32(sizeof(*head));
	head->ordinal = cpu_to_be32(ordinal);
}

static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
{
	buf->data = (u8 *)__get_free_page(GFP_KERNEL);
	if (!buf->data)
		return -ENOMEM;

	buf->flags = 0;
	tpm_buf_reset(buf, tag, ordinal);
	return 0;
}

static inline void tpm_buf_destroy(struct tpm_buf *buf)
{
	free_page((unsigned long)buf->data);
}

static inline u32 tpm_buf_length(struct tpm_buf *buf)
{
	struct tpm_header *head = (struct tpm_header *)buf->data;

	return be32_to_cpu(head->length);
}

static inline u16 tpm_buf_tag(struct tpm_buf *buf)
{
	struct tpm_header *head = (struct tpm_header *)buf->data;

	return be16_to_cpu(head->tag);
}

static inline void tpm_buf_append(struct tpm_buf *buf,
				  const unsigned char *new_data,
				  unsigned int new_len)
{
	struct tpm_header *head = (struct tpm_header *)buf->data;
	u32 len = tpm_buf_length(buf);

	/* Return silently if overflow has already happened. */
	if (buf->flags & TPM_BUF_OVERFLOW)
		return;

	if ((len + new_len) > PAGE_SIZE) {
		WARN(1, "tpm_buf: overflow\n");
		buf->flags |= TPM_BUF_OVERFLOW;
		return;
	}

	memcpy(&buf->data[len], new_data, new_len);
	head->length = cpu_to_be32(len + new_len);
}

static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
{
	tpm_buf_append(buf, &value, 1);
}

static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
{
	__be16 value2 = cpu_to_be16(value);

	tpm_buf_append(buf, (u8 *) &value2, 2);
}

static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
{
	__be32 value2 = cpu_to_be32(value);

	tpm_buf_append(buf, (u8 *) &value2, 4);
}

static inline u32 tpm2_rc_value(u32 rc)
{
	return (rc & BIT(7)) ? rc & 0xff : rc;
}

#if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)

extern int tpm_is_tpm2(struct tpm_chip *chip);
extern int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
			struct tpm_digest *digest);
extern int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
			  struct tpm_digest *digests);
extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen);
extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
extern struct tpm_chip *tpm_default_chip(void);
void tpm2_flush_context(struct tpm_chip *chip, u32 handle);
#else
static inline int tpm_is_tpm2(struct tpm_chip *chip)
{
	return -ENODEV;
}

static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx,
			       struct tpm_digest *digest)
{
	return -ENODEV;
}

static inline int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
				 struct tpm_digest *digests)
{
	return -ENODEV;
}

static inline int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
{
	return -ENODEV;
}
static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max)
{
	return -ENODEV;
}

static inline struct tpm_chip *tpm_default_chip(void)
{
	return NULL;
}
#endif
#endif