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1 /*
2  * Copyright (C) 2004 IBM Corporation
3  * Copyright (C) 2015 Intel Corporation
4  *
5  * Authors:
6  * Leendert van Doorn <[email protected]>
7  * Dave Safford <[email protected]>
8  * Reiner Sailer <[email protected]>
9  * Kylene Hall <[email protected]>
10  *
11  * Maintained by: <[email protected]>
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/mutex.h>
30 #include <linux/sched.h>
31 #include <linux/platform_device.h>
32 #include <linux/io.h>
33 #include <linux/tpm.h>
34 #include <linux/acpi.h>
35 #include <linux/cdev.h>
36 #include <linux/highmem.h>
37 #include <crypto/hash_info.h>
38
39 enum tpm_const {
40         TPM_MINOR = 224,        /* officially assigned */
41         TPM_BUFSIZE = 4096,
42         TPM_NUM_DEVICES = 65536,
43         TPM_RETRY = 50,         /* 5 seconds */
44         TPM_NUM_EVENT_LOG_FILES = 3,
45 };
46
47 enum tpm_timeout {
48         TPM_TIMEOUT = 5,        /* msecs */
49         TPM_TIMEOUT_RETRY = 100 /* msecs */
50 };
51
52 /* TPM addresses */
53 enum tpm_addr {
54         TPM_SUPERIO_ADDR = 0x2E,
55         TPM_ADDR = 0x4E,
56 };
57
58 /* Indexes the duration array */
59 enum tpm_duration {
60         TPM_SHORT = 0,
61         TPM_MEDIUM = 1,
62         TPM_LONG = 2,
63         TPM_UNDEFINED,
64 };
65
66 #define TPM_WARN_RETRY          0x800
67 #define TPM_WARN_DOING_SELFTEST 0x802
68 #define TPM_ERR_DEACTIVATED     0x6
69 #define TPM_ERR_DISABLED        0x7
70 #define TPM_ERR_INVALID_POSTINIT 38
71
72 #define TPM_HEADER_SIZE         10
73
74 enum tpm2_const {
75         TPM2_PLATFORM_PCR       = 24,
76         TPM2_PCR_SELECT_MIN     = ((TPM2_PLATFORM_PCR + 7) / 8),
77         TPM2_TIMEOUT_A          = 750,
78         TPM2_TIMEOUT_B          = 2000,
79         TPM2_TIMEOUT_C          = 200,
80         TPM2_TIMEOUT_D          = 30,
81         TPM2_DURATION_SHORT     = 20,
82         TPM2_DURATION_MEDIUM    = 750,
83         TPM2_DURATION_LONG      = 2000,
84 };
85
86 enum tpm2_structures {
87         TPM2_ST_NO_SESSIONS     = 0x8001,
88         TPM2_ST_SESSIONS        = 0x8002,
89 };
90
91 enum tpm2_return_codes {
92         TPM2_RC_SUCCESS         = 0x0000,
93         TPM2_RC_HASH            = 0x0083, /* RC_FMT1 */
94         TPM2_RC_HANDLE          = 0x008B,
95         TPM2_RC_INITIALIZE      = 0x0100, /* RC_VER1 */
96         TPM2_RC_DISABLED        = 0x0120,
97         TPM2_RC_TESTING         = 0x090A, /* RC_WARN */
98         TPM2_RC_REFERENCE_H0    = 0x0910,
99 };
100
101 enum tpm2_algorithms {
102         TPM2_ALG_ERROR          = 0x0000,
103         TPM2_ALG_SHA1           = 0x0004,
104         TPM2_ALG_KEYEDHASH      = 0x0008,
105         TPM2_ALG_SHA256         = 0x000B,
106         TPM2_ALG_SHA384         = 0x000C,
107         TPM2_ALG_SHA512         = 0x000D,
108         TPM2_ALG_NULL           = 0x0010,
109         TPM2_ALG_SM3_256        = 0x0012,
110 };
111
112 enum tpm2_command_codes {
113         TPM2_CC_FIRST           = 0x011F,
114         TPM2_CC_SELF_TEST       = 0x0143,
115         TPM2_CC_STARTUP         = 0x0144,
116         TPM2_CC_SHUTDOWN        = 0x0145,
117         TPM2_CC_CREATE          = 0x0153,
118         TPM2_CC_LOAD            = 0x0157,
119         TPM2_CC_UNSEAL          = 0x015E,
120         TPM2_CC_CONTEXT_LOAD    = 0x0161,
121         TPM2_CC_CONTEXT_SAVE    = 0x0162,
122         TPM2_CC_FLUSH_CONTEXT   = 0x0165,
123         TPM2_CC_GET_CAPABILITY  = 0x017A,
124         TPM2_CC_GET_RANDOM      = 0x017B,
125         TPM2_CC_PCR_READ        = 0x017E,
126         TPM2_CC_PCR_EXTEND      = 0x0182,
127         TPM2_CC_LAST            = 0x018F,
128 };
129
130 enum tpm2_permanent_handles {
131         TPM2_RS_PW              = 0x40000009,
132 };
133
134 enum tpm2_capabilities {
135         TPM2_CAP_HANDLES        = 1,
136         TPM2_CAP_COMMANDS       = 2,
137         TPM2_CAP_PCRS           = 5,
138         TPM2_CAP_TPM_PROPERTIES = 6,
139 };
140
141 enum tpm2_properties {
142         TPM_PT_TOTAL_COMMANDS   = 0x0129,
143 };
144
145 enum tpm2_startup_types {
146         TPM2_SU_CLEAR   = 0x0000,
147         TPM2_SU_STATE   = 0x0001,
148 };
149
150 enum tpm2_cc_attrs {
151         TPM2_CC_ATTR_CHANDLES   = 25,
152         TPM2_CC_ATTR_RHANDLE    = 28,
153 };
154
155 #define TPM_VID_INTEL    0x8086
156 #define TPM_VID_WINBOND  0x1050
157 #define TPM_VID_STM      0x104A
158
159 #define TPM_PPI_VERSION_LEN             3
160
161 struct tpm_space {
162         u32 context_tbl[3];
163         u8 *context_buf;
164         u32 session_tbl[3];
165         u8 *session_buf;
166 };
167
168 enum tpm_chip_flags {
169         TPM_CHIP_FLAG_TPM2              = BIT(1),
170         TPM_CHIP_FLAG_IRQ               = BIT(2),
171         TPM_CHIP_FLAG_VIRTUAL           = BIT(3),
172         TPM_CHIP_FLAG_HAVE_TIMEOUTS     = BIT(4),
173 };
174
175 struct tpm_bios_log {
176         void *bios_event_log;
177         void *bios_event_log_end;
178 };
179
180 struct tpm_chip_seqops {
181         struct tpm_chip *chip;
182         const struct seq_operations *seqops;
183 };
184
185 struct tpm_chip {
186         struct device dev;
187         struct device devs;
188         struct cdev cdev;
189         struct cdev cdevs;
190
191         /* A driver callback under ops cannot be run unless ops_sem is held
192          * (sometimes implicitly, eg for the sysfs code). ops becomes null
193          * when the driver is unregistered, see tpm_try_get_ops.
194          */
195         struct rw_semaphore ops_sem;
196         const struct tpm_class_ops *ops;
197
198         struct tpm_bios_log log;
199         struct tpm_chip_seqops bin_log_seqops;
200         struct tpm_chip_seqops ascii_log_seqops;
201
202         unsigned int flags;
203
204         int dev_num;            /* /dev/tpm# */
205         unsigned long is_open;  /* only one allowed */
206
207         struct mutex tpm_mutex; /* tpm is processing */
208
209         unsigned long timeout_a; /* jiffies */
210         unsigned long timeout_b; /* jiffies */
211         unsigned long timeout_c; /* jiffies */
212         unsigned long timeout_d; /* jiffies */
213         bool timeout_adjusted;
214         unsigned long duration[3]; /* jiffies */
215         bool duration_adjusted;
216
217         struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
218
219         const struct attribute_group *groups[3];
220         unsigned int groups_cnt;
221
222         u16 active_banks[7];
223 #ifdef CONFIG_ACPI
224         acpi_handle acpi_dev_handle;
225         char ppi_version[TPM_PPI_VERSION_LEN + 1];
226 #endif /* CONFIG_ACPI */
227
228         struct tpm_space work_space;
229         u32 nr_commands;
230         u32 *cc_attrs_tbl;
231
232         /* active locality */
233         int locality;
234 };
235
236 #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
237
238 struct tpm_input_header {
239         __be16  tag;
240         __be32  length;
241         __be32  ordinal;
242 } __packed;
243
244 struct tpm_output_header {
245         __be16  tag;
246         __be32  length;
247         __be32  return_code;
248 } __packed;
249
250 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
251
252 struct  stclear_flags_t {
253         __be16  tag;
254         u8      deactivated;
255         u8      disableForceClear;
256         u8      physicalPresence;
257         u8      physicalPresenceLock;
258         u8      bGlobalLock;
259 } __packed;
260
261 struct  tpm_version_t {
262         u8      Major;
263         u8      Minor;
264         u8      revMajor;
265         u8      revMinor;
266 } __packed;
267
268 struct  tpm_version_1_2_t {
269         __be16  tag;
270         u8      Major;
271         u8      Minor;
272         u8      revMajor;
273         u8      revMinor;
274 } __packed;
275
276 struct  timeout_t {
277         __be32  a;
278         __be32  b;
279         __be32  c;
280         __be32  d;
281 } __packed;
282
283 struct duration_t {
284         __be32  tpm_short;
285         __be32  tpm_medium;
286         __be32  tpm_long;
287 } __packed;
288
289 struct permanent_flags_t {
290         __be16  tag;
291         u8      disable;
292         u8      ownership;
293         u8      deactivated;
294         u8      readPubek;
295         u8      disableOwnerClear;
296         u8      allowMaintenance;
297         u8      physicalPresenceLifetimeLock;
298         u8      physicalPresenceHWEnable;
299         u8      physicalPresenceCMDEnable;
300         u8      CEKPUsed;
301         u8      TPMpost;
302         u8      TPMpostLock;
303         u8      FIPS;
304         u8      operator;
305         u8      enableRevokeEK;
306         u8      nvLocked;
307         u8      readSRKPub;
308         u8      tpmEstablished;
309         u8      maintenanceDone;
310         u8      disableFullDALogicInfo;
311 } __packed;
312
313 typedef union {
314         struct  permanent_flags_t perm_flags;
315         struct  stclear_flags_t stclear_flags;
316         __u8    owned;
317         __be32  num_pcrs;
318         struct  tpm_version_t   tpm_version;
319         struct  tpm_version_1_2_t tpm_version_1_2;
320         __be32  manufacturer_id;
321         struct timeout_t  timeout;
322         struct duration_t duration;
323 } cap_t;
324
325 enum tpm_capabilities {
326         TPM_CAP_FLAG = 4,
327         TPM_CAP_PROP = 5,
328         TPM_CAP_VERSION_1_1 = 0x06,
329         TPM_CAP_VERSION_1_2 = 0x1A,
330 };
331
332 enum tpm_sub_capabilities {
333         TPM_CAP_PROP_PCR = 0x101,
334         TPM_CAP_PROP_MANUFACTURER = 0x103,
335         TPM_CAP_FLAG_PERM = 0x108,
336         TPM_CAP_FLAG_VOL = 0x109,
337         TPM_CAP_PROP_OWNER = 0x111,
338         TPM_CAP_PROP_TIS_TIMEOUT = 0x115,
339         TPM_CAP_PROP_TIS_DURATION = 0x120,
340 };
341
342 struct  tpm_getcap_params_in {
343         __be32  cap;
344         __be32  subcap_size;
345         __be32  subcap;
346 } __packed;
347
348 struct  tpm_getcap_params_out {
349         __be32  cap_size;
350         cap_t   cap;
351 } __packed;
352
353 struct  tpm_readpubek_params_out {
354         u8      algorithm[4];
355         u8      encscheme[2];
356         u8      sigscheme[2];
357         __be32  paramsize;
358         u8      parameters[12]; /*assuming RSA*/
359         __be32  keysize;
360         u8      modulus[256];
361         u8      checksum[20];
362 } __packed;
363
364 typedef union {
365         struct  tpm_input_header in;
366         struct  tpm_output_header out;
367 } tpm_cmd_header;
368
369 struct tpm_pcrread_out {
370         u8      pcr_result[TPM_DIGEST_SIZE];
371 } __packed;
372
373 struct tpm_pcrread_in {
374         __be32  pcr_idx;
375 } __packed;
376
377 struct tpm_pcrextend_in {
378         __be32  pcr_idx;
379         u8      hash[TPM_DIGEST_SIZE];
380 } __packed;
381
382 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
383  * bytes, but 128 is still a relatively large number of random bytes and
384  * anything much bigger causes users of struct tpm_cmd_t to start getting
385  * compiler warnings about stack frame size. */
386 #define TPM_MAX_RNG_DATA        128
387
388 struct tpm_getrandom_out {
389         __be32 rng_data_len;
390         u8     rng_data[TPM_MAX_RNG_DATA];
391 } __packed;
392
393 struct tpm_getrandom_in {
394         __be32 num_bytes;
395 } __packed;
396
397 struct tpm_startup_in {
398         __be16  startup_type;
399 } __packed;
400
401 typedef union {
402         struct  tpm_getcap_params_out getcap_out;
403         struct  tpm_readpubek_params_out readpubek_out;
404         u8      readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
405         struct  tpm_getcap_params_in getcap_in;
406         struct  tpm_pcrread_in  pcrread_in;
407         struct  tpm_pcrread_out pcrread_out;
408         struct  tpm_pcrextend_in pcrextend_in;
409         struct  tpm_getrandom_in getrandom_in;
410         struct  tpm_getrandom_out getrandom_out;
411         struct tpm_startup_in startup_in;
412 } tpm_cmd_params;
413
414 struct tpm_cmd_t {
415         tpm_cmd_header  header;
416         tpm_cmd_params  params;
417 } __packed;
418
419 struct tpm2_digest {
420         u16 alg_id;
421         u8 digest[SHA512_DIGEST_SIZE];
422 } __packed;
423
424 /* A string buffer type for constructing TPM commands. This is based on the
425  * ideas of string buffer code in security/keys/trusted.h but is heap based
426  * in order to keep the stack usage minimal.
427  */
428
429 enum tpm_buf_flags {
430         TPM_BUF_OVERFLOW        = BIT(0),
431 };
432
433 struct tpm_buf {
434         struct page *data_page;
435         unsigned int flags;
436         u8 *data;
437 };
438
439 static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
440 {
441         struct tpm_input_header *head;
442
443         buf->data_page = alloc_page(GFP_HIGHUSER);
444         if (!buf->data_page)
445                 return -ENOMEM;
446
447         buf->flags = 0;
448         buf->data = kmap(buf->data_page);
449
450         head = (struct tpm_input_header *) buf->data;
451
452         head->tag = cpu_to_be16(tag);
453         head->length = cpu_to_be32(sizeof(*head));
454         head->ordinal = cpu_to_be32(ordinal);
455
456         return 0;
457 }
458
459 static inline void tpm_buf_destroy(struct tpm_buf *buf)
460 {
461         kunmap(buf->data_page);
462         __free_page(buf->data_page);
463 }
464
465 static inline u32 tpm_buf_length(struct tpm_buf *buf)
466 {
467         struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
468
469         return be32_to_cpu(head->length);
470 }
471
472 static inline u16 tpm_buf_tag(struct tpm_buf *buf)
473 {
474         struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
475
476         return be16_to_cpu(head->tag);
477 }
478
479 static inline void tpm_buf_append(struct tpm_buf *buf,
480                                   const unsigned char *new_data,
481                                   unsigned int new_len)
482 {
483         struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
484         u32 len = tpm_buf_length(buf);
485
486         /* Return silently if overflow has already happened. */
487         if (buf->flags & TPM_BUF_OVERFLOW)
488                 return;
489
490         if ((len + new_len) > PAGE_SIZE) {
491                 WARN(1, "tpm_buf: overflow\n");
492                 buf->flags |= TPM_BUF_OVERFLOW;
493                 return;
494         }
495
496         memcpy(&buf->data[len], new_data, new_len);
497         head->length = cpu_to_be32(len + new_len);
498 }
499
500 static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
501 {
502         tpm_buf_append(buf, &value, 1);
503 }
504
505 static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
506 {
507         __be16 value2 = cpu_to_be16(value);
508
509         tpm_buf_append(buf, (u8 *) &value2, 2);
510 }
511
512 static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
513 {
514         __be32 value2 = cpu_to_be32(value);
515
516         tpm_buf_append(buf, (u8 *) &value2, 4);
517 }
518
519 extern struct class *tpm_class;
520 extern struct class *tpmrm_class;
521 extern dev_t tpm_devt;
522 extern const struct file_operations tpm_fops;
523 extern const struct file_operations tpmrm_fops;
524 extern struct idr dev_nums_idr;
525
526 enum tpm_transmit_flags {
527         TPM_TRANSMIT_UNLOCKED   = BIT(0),
528 };
529
530 ssize_t tpm_transmit(struct tpm_chip *chip, struct tpm_space *space,
531                      u8 *buf, size_t bufsiz, unsigned int flags);
532 ssize_t tpm_transmit_cmd(struct tpm_chip *chip, struct tpm_space *space,
533                          const void *buf, size_t bufsiz,
534                          size_t min_rsp_body_length, unsigned int flags,
535                          const char *desc);
536 ssize_t tpm_getcap(struct tpm_chip *chip, u32 subcap_id, cap_t *cap,
537                    const char *desc, size_t min_cap_length);
538 int tpm_get_timeouts(struct tpm_chip *);
539 int tpm1_auto_startup(struct tpm_chip *chip);
540 int tpm_do_selftest(struct tpm_chip *chip);
541 unsigned long tpm_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
542 int tpm_pm_suspend(struct device *dev);
543 int tpm_pm_resume(struct device *dev);
544 int wait_for_tpm_stat(struct tpm_chip *chip, u8 mask, unsigned long timeout,
545                       wait_queue_head_t *queue, bool check_cancel);
546
547 struct tpm_chip *tpm_chip_find_get(int chip_num);
548 __must_check int tpm_try_get_ops(struct tpm_chip *chip);
549 void tpm_put_ops(struct tpm_chip *chip);
550
551 struct tpm_chip *tpm_chip_alloc(struct device *dev,
552                                 const struct tpm_class_ops *ops);
553 struct tpm_chip *tpmm_chip_alloc(struct device *pdev,
554                                  const struct tpm_class_ops *ops);
555 int tpm_chip_register(struct tpm_chip *chip);
556 void tpm_chip_unregister(struct tpm_chip *chip);
557
558 void tpm_sysfs_add_device(struct tpm_chip *chip);
559
560 int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
561
562 #ifdef CONFIG_ACPI
563 extern void tpm_add_ppi(struct tpm_chip *chip);
564 #else
565 static inline void tpm_add_ppi(struct tpm_chip *chip)
566 {
567 }
568 #endif
569
570 static inline inline u32 tpm2_rc_value(u32 rc)
571 {
572         return (rc & BIT(7)) ? rc & 0xff : rc;
573 }
574
575 int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
576 int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, u32 count,
577                     struct tpm2_digest *digests);
578 int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
579 void tpm2_flush_context_cmd(struct tpm_chip *chip, u32 handle,
580                             unsigned int flags);
581 int tpm2_seal_trusted(struct tpm_chip *chip,
582                       struct trusted_key_payload *payload,
583                       struct trusted_key_options *options);
584 int tpm2_unseal_trusted(struct tpm_chip *chip,
585                         struct trusted_key_payload *payload,
586                         struct trusted_key_options *options);
587 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
588                         u32 *value, const char *desc);
589
590 int tpm2_auto_startup(struct tpm_chip *chip);
591 void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
592 unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *chip, u32 ordinal);
593 int tpm2_probe(struct tpm_chip *chip);
594 int tpm2_find_cc(struct tpm_chip *chip, u32 cc);
595 int tpm2_init_space(struct tpm_space *space);
596 void tpm2_del_space(struct tpm_chip *chip, struct tpm_space *space);
597 int tpm2_prepare_space(struct tpm_chip *chip, struct tpm_space *space, u32 cc,
598                        u8 *cmd);
599 int tpm2_commit_space(struct tpm_chip *chip, struct tpm_space *space,
600                       u32 cc, u8 *buf, size_t *bufsiz);
601 #endif
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