1 /*
2 * Copyright (C) 2004 IBM Corporation
3 * Copyright (C) 2015 Intel Corporation
4 *
5 * Authors:
6 * Leendert van Doorn <leendert@watson.ibm.com>
7 * Dave Safford <safford@watson.ibm.com>
8 * Reiner Sailer <sailer@watson.ibm.com>
9 * Kylene Hall <kjhall@us.ibm.com>
10 *
11 * Maintained by: <tpmdd-devel@lists.sourceforge.net>
12 *
13 * Device driver for TCG/TCPA TPM (trusted platform module).
14 * Specifications at www.trustedcomputinggroup.org
15 *
16 * This program is free software; you can redistribute it and/or
17 * modify it under the terms of the GNU General Public License as
18 * published by the Free Software Foundation, version 2 of the
19 * License.
20 *
21 */
22
23 #ifndef __TPM_H__
24 #define __TPM_H__
25
26 #include <linux/module.h>
27 #include <linux/delay.h>
28 #include <linux/fs.h>
29 #include <linux/hw_random.h>
30 #include <linux/mutex.h>
31 #include <linux/sched.h>
32 #include <linux/platform_device.h>
33 #include <linux/io.h>
34 #include <linux/tpm.h>
35 #include <linux/acpi.h>
36 #include <linux/cdev.h>
37 #include <linux/highmem.h>
38 #include <linux/tpm_eventlog.h>
39 #include <crypto/hash_info.h>
40
41 #ifdef CONFIG_X86
42 #include <asm/intel-family.h>
43 #endif
44
45 enum tpm_const {
46 TPM_MINOR = 224, /* officially assigned */
47 TPM_BUFSIZE = 4096,
48 TPM_NUM_DEVICES = 65536,
49 TPM_RETRY = 50, /* 5 seconds */
50 TPM_NUM_EVENT_LOG_FILES = 3,
51 };
52
53 enum tpm_timeout {
54 TPM_TIMEOUT = 5, /* msecs */
55 TPM_TIMEOUT_RETRY = 100, /* msecs */
56 TPM_TIMEOUT_RANGE_US = 300, /* usecs */
57 TPM_TIMEOUT_POLL = 1, /* msecs */
58 TPM_TIMEOUT_USECS_MIN = 100, /* usecs */
59 TPM_TIMEOUT_USECS_MAX = 500 /* usecs */
60 };
61
62 /* TPM addresses */
63 enum tpm_addr {
64 TPM_SUPERIO_ADDR = 0x2E,
65 TPM_ADDR = 0x4E,
66 };
67
68 /* Indexes the duration array */
69 enum tpm_duration {
70 TPM_SHORT = 0,
71 TPM_MEDIUM = 1,
72 TPM_LONG = 2,
73 TPM_LONG_LONG = 3,
74 TPM_UNDEFINED,
75 TPM_NUM_DURATIONS = TPM_UNDEFINED,
76 };
77
78 #define TPM_WARN_RETRY 0x800
79 #define TPM_WARN_DOING_SELFTEST 0x802
80 #define TPM_ERR_DEACTIVATED 0x6
81 #define TPM_ERR_DISABLED 0x7
82 #define TPM_ERR_INVALID_POSTINIT 38
83
84 #define TPM_HEADER_SIZE 10
85
86 enum tpm2_const {
87 TPM2_PLATFORM_PCR = 24,
88 TPM2_PCR_SELECT_MIN = ((TPM2_PLATFORM_PCR + 7) / 8),
89 };
90
91 enum tpm2_timeouts {
92 TPM2_TIMEOUT_A = 750,
93 TPM2_TIMEOUT_B = 2000,
94 TPM2_TIMEOUT_C = 200,
95 TPM2_TIMEOUT_D = 30,
96 TPM2_DURATION_SHORT = 20,
97 TPM2_DURATION_MEDIUM = 750,
98 TPM2_DURATION_LONG = 2000,
99 TPM2_DURATION_LONG_LONG = 300000,
100 TPM2_DURATION_DEFAULT = 120000,
101 };
102
103 enum tpm2_structures {
104 TPM2_ST_NO_SESSIONS = 0x8001,
105 TPM2_ST_SESSIONS = 0x8002,
106 };
107
108 /* Indicates from what layer of the software stack the error comes from */
109 #define TSS2_RC_LAYER_SHIFT 16
110 #define TSS2_RESMGR_TPM_RC_LAYER (11 << TSS2_RC_LAYER_SHIFT)
111
112 enum tpm2_return_codes {
113 TPM2_RC_SUCCESS = 0x0000,
114 TPM2_RC_HASH = 0x0083, /* RC_FMT1 */
115 TPM2_RC_HANDLE = 0x008B,
116 TPM2_RC_INITIALIZE = 0x0100, /* RC_VER1 */
117 TPM2_RC_FAILURE = 0x0101,
118 TPM2_RC_DISABLED = 0x0120,
119 TPM2_RC_COMMAND_CODE = 0x0143,
120 TPM2_RC_TESTING = 0x090A, /* RC_WARN */
121 TPM2_RC_REFERENCE_H0 = 0x0910,
122 TPM2_RC_RETRY = 0x0922,
123 };
124
125 enum tpm2_algorithms {
126 TPM2_ALG_ERROR = 0x0000,
127 TPM2_ALG_SHA1 = 0x0004,
128 TPM2_ALG_KEYEDHASH = 0x0008,
129 TPM2_ALG_SHA256 = 0x000B,
130 TPM2_ALG_SHA384 = 0x000C,
131 TPM2_ALG_SHA512 = 0x000D,
132 TPM2_ALG_NULL = 0x0010,
133 TPM2_ALG_SM3_256 = 0x0012,
134 };
135
136 enum tpm2_command_codes {
137 TPM2_CC_FIRST = 0x011F,
138 TPM2_CC_CREATE_PRIMARY = 0x0131,
139 TPM2_CC_SELF_TEST = 0x0143,
140 TPM2_CC_STARTUP = 0x0144,
141 TPM2_CC_SHUTDOWN = 0x0145,
142 TPM2_CC_CREATE = 0x0153,
143 TPM2_CC_LOAD = 0x0157,
144 TPM2_CC_UNSEAL = 0x015E,
145 TPM2_CC_CONTEXT_LOAD = 0x0161,
146 TPM2_CC_CONTEXT_SAVE = 0x0162,
147 TPM2_CC_FLUSH_CONTEXT = 0x0165,
148 TPM2_CC_GET_CAPABILITY = 0x017A,
149 TPM2_CC_GET_RANDOM = 0x017B,
150 TPM2_CC_PCR_READ = 0x017E,
151 TPM2_CC_PCR_EXTEND = 0x0182,
152 TPM2_CC_LAST = 0x018F,
153 };
154
155 enum tpm2_permanent_handles {
156 TPM2_RS_PW = 0x40000009,
157 };
158
159 enum tpm2_capabilities {
160 TPM2_CAP_HANDLES = 1,
161 TPM2_CAP_COMMANDS = 2,
162 TPM2_CAP_PCRS = 5,
163 TPM2_CAP_TPM_PROPERTIES = 6,
164 };
165
166 enum tpm2_properties {
167 TPM_PT_TOTAL_COMMANDS = 0x0129,
168 };
169
170 enum tpm2_startup_types {
171 TPM2_SU_CLEAR = 0x0000,
172 TPM2_SU_STATE = 0x0001,
173 };
174
175 enum tpm2_cc_attrs {
176 TPM2_CC_ATTR_CHANDLES = 25,
177 TPM2_CC_ATTR_RHANDLE = 28,
178 };
179
180 #define TPM_VID_INTEL 0x8086
181 #define TPM_VID_WINBOND 0x1050
182 #define TPM_VID_STM 0x104A
183
184 #define TPM_PPI_VERSION_LEN 3
185
186 struct tpm_space {
187 u32 context_tbl[3];
188 u8 *context_buf;
189 u32 session_tbl[3];
190 u8 *session_buf;
191 u32 buf_size;
192 };
193
194 enum tpm_chip_flags {
195 TPM_CHIP_FLAG_TPM2 = BIT(1),
196 TPM_CHIP_FLAG_IRQ = BIT(2),
197 TPM_CHIP_FLAG_VIRTUAL = BIT(3),
198 TPM_CHIP_FLAG_HAVE_TIMEOUTS = BIT(4),
199 TPM_CHIP_FLAG_ALWAYS_POWERED = BIT(5),
200 };
201
202 struct tpm_bios_log {
203 void *bios_event_log;
204 void *bios_event_log_end;
205 };
206
207 struct tpm_chip_seqops {
208 struct tpm_chip *chip;
209 const struct seq_operations *seqops;
210 };
211
212 struct tpm_chip {
213 struct device dev;
214 struct device devs;
215 struct cdev cdev;
216 struct cdev cdevs;
217
218 /* A driver callback under ops cannot be run unless ops_sem is held
219 * (sometimes implicitly, eg for the sysfs code). ops becomes null
220 * when the driver is unregistered, see tpm_try_get_ops.
221 */
222 struct rw_semaphore ops_sem;
223 const struct tpm_class_ops *ops;
224
225 struct tpm_bios_log log;
226 struct tpm_chip_seqops bin_log_seqops;
227 struct tpm_chip_seqops ascii_log_seqops;
228
229 unsigned int flags;
230
231 int dev_num; /* /dev/tpm# */
232 unsigned long is_open; /* only one allowed */
233
234 char hwrng_name[64];
235 struct hwrng hwrng;
236
237 struct mutex tpm_mutex; /* tpm is processing */
238
239 unsigned long timeout_a; /* jiffies */
240 unsigned long timeout_b; /* jiffies */
241 unsigned long timeout_c; /* jiffies */
242 unsigned long timeout_d; /* jiffies */
243 bool timeout_adjusted;
244 unsigned long duration[TPM_NUM_DURATIONS]; /* jiffies */
245 bool duration_adjusted;
246
247 struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
248
249 const struct attribute_group *groups[3];
250 unsigned int groups_cnt;
251
252 u16 active_banks[7];
253 #ifdef CONFIG_ACPI
254 acpi_handle acpi_dev_handle;
255 char ppi_version[TPM_PPI_VERSION_LEN + 1];
256 #endif /* CONFIG_ACPI */
257
258 struct tpm_space work_space;
259 u32 nr_commands;
260 u32 *cc_attrs_tbl;
261
262 /* active locality */
263 int locality;
264 };
265
266 #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
267
268 struct tpm_input_header {
269 __be16 tag;
270 __be32 length;
271 __be32 ordinal;
272 } __packed;
273
274 struct tpm_output_header {
275 __be16 tag;
276 __be32 length;
277 __be32 return_code;
278 } __packed;
279
280 #define TPM_TAG_RQU_COMMAND 193
281
282 /* TPM2 specific constants. */
283 #define TPM2_SPACE_BUFFER_SIZE 16384 /* 16 kB */
284
285 struct stclear_flags_t {
286 __be16 tag;
287 u8 deactivated;
288 u8 disableForceClear;
289 u8 physicalPresence;
290 u8 physicalPresenceLock;
291 u8 bGlobalLock;
292 } __packed;
293
294 struct tpm_version_t {
295 u8 Major;
296 u8 Minor;
297 u8 revMajor;
298 u8 revMinor;
299 } __packed;
300
301 struct tpm_version_1_2_t {
302 __be16 tag;
303 u8 Major;
304 u8 Minor;
305 u8 revMajor;
306 u8 revMinor;
307 } __packed;
308
309 struct timeout_t {
310 __be32 a;
311 __be32 b;
312 __be32 c;
313 __be32 d;
314 } __packed;
315
316 struct duration_t {
317 __be32 tpm_short;
318 __be32 tpm_medium;
319 __be32 tpm_long;
320 } __packed;
321
322 struct permanent_flags_t {
323 __be16 tag;
324 u8 disable;
325 u8 ownership;
326 u8 deactivated;
327 u8 readPubek;
328 u8 disableOwnerClear;
329 u8 allowMaintenance;
330 u8 physicalPresenceLifetimeLock;
331 u8 physicalPresenceHWEnable;
332 u8 physicalPresenceCMDEnable;
333 u8 CEKPUsed;
334 u8 TPMpost;
335 u8 TPMpostLock;
336 u8 FIPS;
337 u8 operator;
338 u8 enableRevokeEK;
339 u8 nvLocked;
340 u8 readSRKPub;
341 u8 tpmEstablished;
342 u8 maintenanceDone;
343 u8 disableFullDALogicInfo;
344 } __packed;
345
346 typedef union {
347 struct permanent_flags_t perm_flags;
348 struct stclear_flags_t stclear_flags;
349 __u8 owned;
350 __be32 num_pcrs;
351 struct tpm_version_t tpm_version;
352 struct tpm_version_1_2_t tpm_version_1_2;
353 __be32 manufacturer_id;
354 struct timeout_t timeout;
355 struct duration_t duration;
356 } cap_t;
357
358 enum tpm_capabilities {
359 TPM_CAP_FLAG = 4,
360 TPM_CAP_PROP = 5,
361 TPM_CAP_VERSION_1_1 = 0x06,
362 TPM_CAP_VERSION_1_2 = 0x1A,
363 };
364
365 enum tpm_sub_capabilities {
366 TPM_CAP_PROP_PCR = 0x101,
367 TPM_CAP_PROP_MANUFACTURER = 0x103,
368 TPM_CAP_FLAG_PERM = 0x108,
369 TPM_CAP_FLAG_VOL = 0x109,
370 TPM_CAP_PROP_OWNER = 0x111,
371 TPM_CAP_PROP_TIS_TIMEOUT = 0x115,
372 TPM_CAP_PROP_TIS_DURATION = 0x120,
373 };
374
375 typedef union {
376 struct tpm_input_header in;
377 struct tpm_output_header out;
378 } tpm_cmd_header;
379
380 struct tpm_pcrread_out {
381 u8 pcr_result[TPM_DIGEST_SIZE];
382 } __packed;
383
384 struct tpm_pcrread_in {
385 __be32 pcr_idx;
386 } __packed;
387
388 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
389 * bytes, but 128 is still a relatively large number of random bytes and
390 * anything much bigger causes users of struct tpm_cmd_t to start getting
391 * compiler warnings about stack frame size. */
392 #define TPM_MAX_RNG_DATA 128
393
394 struct tpm_getrandom_out {
395 __be32 rng_data_len;
396 u8 rng_data[TPM_MAX_RNG_DATA];
397 } __packed;
398
399 struct tpm_getrandom_in {
400 __be32 num_bytes;
401 } __packed;
402
403 typedef union {
404 struct tpm_pcrread_in pcrread_in;
405 struct tpm_pcrread_out pcrread_out;
406 struct tpm_getrandom_in getrandom_in;
407 struct tpm_getrandom_out getrandom_out;
408 } tpm_cmd_params;
409
410 struct tpm_cmd_t {
411 tpm_cmd_header header;
412 tpm_cmd_params params;
413 } __packed;
414
415
416 /* A string buffer type for constructing TPM commands. This is based on the
417 * ideas of string buffer code in security/keys/trusted.h but is heap based
418 * in order to keep the stack usage minimal.
419 */
420
421 enum tpm_buf_flags {
422 TPM_BUF_OVERFLOW = BIT(0),
423 };
424
425 struct tpm_buf {
426 struct page *data_page;
427 unsigned int flags;
428 u8 *data;
429 };
430
tpm_buf_reset(struct tpm_buf * buf,u16 tag,u32 ordinal)431 static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal)
432 {
433 struct tpm_input_header *head;
434 head = (struct tpm_input_header *)buf->data;
435 head->tag = cpu_to_be16(tag);
436 head->length = cpu_to_be32(sizeof(*head));
437 head->ordinal = cpu_to_be32(ordinal);
438 }
439
tpm_buf_init(struct tpm_buf * buf,u16 tag,u32 ordinal)440 static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
441 {
442 buf->data_page = alloc_page(GFP_HIGHUSER);
443 if (!buf->data_page)
444 return -ENOMEM;
445
446 buf->flags = 0;
447 buf->data = kmap(buf->data_page);
448 tpm_buf_reset(buf, tag, ordinal);
449 return 0;
450 }
451
tpm_buf_destroy(struct tpm_buf * buf)452 static inline void tpm_buf_destroy(struct tpm_buf *buf)
453 {
454 kunmap(buf->data_page);
455 __free_page(buf->data_page);
456 }
457
tpm_buf_length(struct tpm_buf * buf)458 static inline u32 tpm_buf_length(struct tpm_buf *buf)
459 {
460 struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
461
462 return be32_to_cpu(head->length);
463 }
464
tpm_buf_tag(struct tpm_buf * buf)465 static inline u16 tpm_buf_tag(struct tpm_buf *buf)
466 {
467 struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
468
469 return be16_to_cpu(head->tag);
470 }
471
tpm_buf_append(struct tpm_buf * buf,const unsigned char * new_data,unsigned int new_len)472 static inline void tpm_buf_append(struct tpm_buf *buf,
473 const unsigned char *new_data,
474 unsigned int new_len)
475 {
476 struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
477 u32 len = tpm_buf_length(buf);
478
479 /* Return silently if overflow has already happened. */
480 if (buf->flags & TPM_BUF_OVERFLOW)
481 return;
482
483 if ((len + new_len) > PAGE_SIZE) {
484 WARN(1, "tpm_buf: overflow\n");
485 buf->flags |= TPM_BUF_OVERFLOW;
486 return;
487 }
488
489 memcpy(&buf->data[len], new_data, new_len);
490 head->length = cpu_to_be32(len + new_len);
491 }
492
tpm_buf_append_u8(struct tpm_buf * buf,const u8 value)493 static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
494 {
495 tpm_buf_append(buf, &value, 1);
496 }
497
tpm_buf_append_u16(struct tpm_buf * buf,const u16 value)498 static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
499 {
500 __be16 value2 = cpu_to_be16(value);
501
502 tpm_buf_append(buf, (u8 *) &value2, 2);
503 }
504
tpm_buf_append_u32(struct tpm_buf * buf,const u32 value)505 static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
506 {
507 __be32 value2 = cpu_to_be32(value);
508
509 tpm_buf_append(buf, (u8 *) &value2, 4);
510 }
511
512 extern struct class *tpm_class;
513 extern struct class *tpmrm_class;
514 extern dev_t tpm_devt;
515 extern const struct file_operations tpm_fops;
516 extern const struct file_operations tpmrm_fops;
517 extern struct idr dev_nums_idr;
518
519 /**
520 * enum tpm_transmit_flags - flags for tpm_transmit()
521 *
522 * @TPM_TRANSMIT_UNLOCKED: do not lock the chip
523 * @TPM_TRANSMIT_NESTED: discard setup steps (power management,
524 * locality) including locking (i.e. implicit
525 * UNLOCKED)
526 */
527 enum tpm_transmit_flags {
528 TPM_TRANSMIT_UNLOCKED = BIT(0),
529 TPM_TRANSMIT_NESTED = BIT(1),
530 };
531
532 ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
533 u8 *buf, size_t bufsiz, unsigned int flags);
534 ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
535 void *buf, size_t bufsiz,
536 size_t min_rsp_body_length, unsigned int flags,
537 const char *desc);
538 int tpm_startup(struct tpm_chip *chip);
539 ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
540 const char *desc, size_t min_cap_length);
541 int tpm_get_timeouts(struct tpm_chip *);
542 int tpm1_auto_startup(struct tpm_chip *chip);
543 int tpm_do_selftest(struct tpm_chip *chip);
544 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
545 int tpm_pm_suspend(struct device *dev);
546 int tpm_pm_resume(struct device *dev);
547
tpm_msleep(unsigned int delay_msec)548 static inline void tpm_msleep(unsigned int delay_msec)
549 {
550 usleep_range((delay_msec * 1000) - TPM_TIMEOUT_RANGE_US,
551 delay_msec * 1000);
552 };
553
554 struct tpm_chip *tpm_find_get_ops(struct tpm_chip *chip);
555 __must_check int tpm_try_get_ops(struct tpm_chip *chip);
556 void tpm_put_ops(struct tpm_chip *chip);
557
558 struct tpm_chip *tpm_chip_alloc(struct device *dev,
559 const struct tpm_class_ops *ops);
560 struct tpm_chip *tpmm_chip_alloc(struct device *pdev,
561 const struct tpm_class_ops *ops);
562 int tpm_chip_register(struct tpm_chip *chip);
563 void tpm_chip_unregister(struct tpm_chip *chip);
564
565 void tpm_sysfs_add_device(struct tpm_chip *chip);
566
567 int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
568
569 #ifdef CONFIG_ACPI
570 extern void tpm_add_ppi(struct tpm_chip *chip);
571 #else
tpm_add_ppi(struct tpm_chip * chip)572 static inline void tpm_add_ppi(struct tpm_chip *chip)
573 {
574 }
575 #endif
576
tpm2_rc_value(u32 rc)577 static inline u32 tpm2_rc_value(u32 rc)
578 {
579 return (rc & BIT(7)) ? rc & 0xff : rc;
580 }
581
582 int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
583 int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, u32 count,
584 struct tpm2_digest *digests);
585 int tpm2_get_random(struct tpm_chip *chip, u8 *dest, size_t max);
586 void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
587 unsigned int flags);
588 int tpm2_seal_trusted(struct tpm_chip *chip,
589 struct trusted_key_payload *payload,
590 struct trusted_key_options *options);
591 int tpm2_unseal_trusted(struct tpm_chip *chip,
592 struct trusted_key_payload *payload,
593 struct trusted_key_options *options);
594 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
595 u32 *value, const char *desc);
596
597 int tpm2_auto_startup(struct tpm_chip *chip);
598 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
599 unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
600 int tpm2_probe(struct tpm_chip *chip);
601 int tpm2_find_cc(struct tpm_chip *chip, u32 cc);
602 int tpm2_init_space(struct tpm_space *space, unsigned int buf_size);
603 void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space);
604 int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u32 cc,
605 u8 *cmd);
606 int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space,
607 u32 cc, u8 *buf, size_t *bufsiz);
608 int tpm_devs_add(struct tpm_chip *chip);
609 void tpm_devs_remove(struct tpm_chip *chip);
610
611 void tpm_bios_log_setup(struct tpm_chip *chip);
612 void tpm_bios_log_teardown(struct tpm_chip *chip);
613 #endif
614