drivers/char/tpm/tpm.h

   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/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
  38 enum tpm_const {
  39         TPM_MINOR = 224,        /* officially assigned */
  40         TPM_BUFSIZE = 4096,
  41         TPM_NUM_DEVICES = 65536,
  42         TPM_RETRY = 50,         /* 5 seconds */
  43 };
  44
  45 enum tpm_timeout {
  46         TPM_TIMEOUT = 5,        /* msecs */
  47         TPM_TIMEOUT_RETRY = 100 /* msecs */
  48 };
  49
  50 /* TPM addresses */
  51 enum tpm_addr {
  52         TPM_SUPERIO_ADDR = 0x2E,
  53         TPM_ADDR = 0x4E,
  54 };
  55
  56 /* Indexes the duration array */
  57 enum tpm_duration {
  58         TPM_SHORT = 0,
  59         TPM_MEDIUM = 1,
  60         TPM_LONG = 2,
  61         TPM_UNDEFINED,
  62 };
  63
  64 #define TPM_WARN_RETRY          0x800
  65 #define TPM_WARN_DOING_SELFTEST 0x802
  66 #define TPM_ERR_DEACTIVATED     0x6
  67 #define TPM_ERR_DISABLED        0x7
  68 #define TPM_ERR_INVALID_POSTINIT 38
  69
  70 #define TPM_HEADER_SIZE         10
  71
  72 enum tpm2_const {
  73         TPM2_PLATFORM_PCR       = 24,
  74         TPM2_PCR_SELECT_MIN     = ((TPM2_PLATFORM_PCR + 7) / 8),
  75         TPM2_TIMEOUT_A          = 750,
  76         TPM2_TIMEOUT_B          = 2000,
  77         TPM2_TIMEOUT_C          = 200,
  78         TPM2_TIMEOUT_D          = 30,
  79         TPM2_DURATION_SHORT     = 20,
  80         TPM2_DURATION_MEDIUM    = 750,
  81         TPM2_DURATION_LONG      = 2000,
  82 };
  83
  84 enum tpm2_structures {
  85         TPM2_ST_NO_SESSIONS     = 0x8001,
  86         TPM2_ST_SESSIONS        = 0x8002,
  87 };
  88
  89 enum tpm2_return_codes {
  90         TPM2_RC_HASH            = 0x0083, /* RC_FMT1 */
  91         TPM2_RC_INITIALIZE      = 0x0100, /* RC_VER1 */
  92         TPM2_RC_DISABLED        = 0x0120,
  93         TPM2_RC_TESTING         = 0x090A, /* RC_WARN */
  94 };
  95
  96 enum tpm2_algorithms {
  97         TPM2_ALG_SHA1           = 0x0004,
  98         TPM2_ALG_KEYEDHASH      = 0x0008,
  99         TPM2_ALG_SHA256         = 0x000B,
 100         TPM2_ALG_SHA384         = 0x000C,
 101         TPM2_ALG_SHA512         = 0x000D,
 102         TPM2_ALG_NULL           = 0x0010,
 103         TPM2_ALG_SM3_256        = 0x0012,
 104 };
 105
 106 enum tpm2_command_codes {
 107         TPM2_CC_FIRST           = 0x011F,
 108         TPM2_CC_SELF_TEST       = 0x0143,
 109         TPM2_CC_STARTUP         = 0x0144,
 110         TPM2_CC_SHUTDOWN        = 0x0145,
 111         TPM2_CC_CREATE          = 0x0153,
 112         TPM2_CC_LOAD            = 0x0157,
 113         TPM2_CC_UNSEAL          = 0x015E,
 114         TPM2_CC_FLUSH_CONTEXT   = 0x0165,
 115         TPM2_CC_GET_CAPABILITY  = 0x017A,
 116         TPM2_CC_GET_RANDOM      = 0x017B,
 117         TPM2_CC_PCR_READ        = 0x017E,
 118         TPM2_CC_PCR_EXTEND      = 0x0182,
 119         TPM2_CC_LAST            = 0x018F,
 120 };
 121
 122 enum tpm2_permanent_handles {
 123         TPM2_RS_PW              = 0x40000009,
 124 };
 125
 126 enum tpm2_capabilities {
 127         TPM2_CAP_TPM_PROPERTIES = 6,
 128 };
 129
 130 enum tpm2_startup_types {
 131         TPM2_SU_CLEAR   = 0x0000,
 132         TPM2_SU_STATE   = 0x0001,
 133 };
 134
 135 #define TPM_VID_INTEL    0x8086
 136 #define TPM_VID_WINBOND  0x1050
 137 #define TPM_VID_STM      0x104A
 138
 139 #define TPM_PPI_VERSION_LEN             3
 140
 141 enum tpm_chip_flags {
 142         TPM_CHIP_FLAG_REGISTERED        = BIT(0),
 143         TPM_CHIP_FLAG_TPM2              = BIT(1),
 144         TPM_CHIP_FLAG_IRQ               = BIT(2),
 145         TPM_CHIP_FLAG_VIRTUAL           = BIT(3),
 146 };
 147
 148 struct tpm_chip {
 149         struct device dev;
 150         struct cdev cdev;
 151
 152         /* A driver callback under ops cannot be run unless ops_sem is held
 153          * (sometimes implicitly, eg for the sysfs code). ops becomes null
 154          * when the driver is unregistered, see tpm_try_get_ops.
 155          */
 156         struct rw_semaphore ops_sem;
 157         const struct tpm_class_ops *ops;
 158
 159         unsigned int flags;
 160
 161         int dev_num;            /* /dev/tpm# */
 162         unsigned long is_open;  /* only one allowed */
 163
 164         struct mutex tpm_mutex; /* tpm is processing */
 165
 166         unsigned long timeout_a; /* jiffies */
 167         unsigned long timeout_b; /* jiffies */
 168         unsigned long timeout_c; /* jiffies */
 169         unsigned long timeout_d; /* jiffies */
 170         bool timeout_adjusted;
 171         unsigned long duration[3]; /* jiffies */
 172         bool duration_adjusted;
 173
 174         struct dentry **bios_dir;
 175
 176         const struct attribute_group *groups[3];
 177         unsigned int groups_cnt;
 178 #ifdef CONFIG_ACPI
 179         acpi_handle acpi_dev_handle;
 180         char ppi_version[TPM_PPI_VERSION_LEN + 1];
 181 #endif /* CONFIG_ACPI */
 182 };
 183
 184 #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
 185
 186 static inline int tpm_read_index(int base, int index)
 187 {
 188         outb(index, base);
 189         return inb(base+1) & 0xFF;
 190 }
 191
 192 static inline void tpm_write_index(int base, int index, int value)
 193 {
 194         outb(index, base);
 195         outb(value & 0xFF, base+1);
 196 }
 197 struct tpm_input_header {
 198         __be16  tag;
 199         __be32  length;
 200         __be32  ordinal;
 201 } __packed;
 202
 203 struct tpm_output_header {
 204         __be16  tag;
 205         __be32  length;
 206         __be32  return_code;
 207 } __packed;
 208
 209 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
 210
 211 struct  stclear_flags_t {
 212         __be16  tag;
 213         u8      deactivated;
 214         u8      disableForceClear;
 215         u8      physicalPresence;
 216         u8      physicalPresenceLock;
 217         u8      bGlobalLock;
 218 } __packed;
 219
 220 struct  tpm_version_t {
 221         u8      Major;
 222         u8      Minor;
 223         u8      revMajor;
 224         u8      revMinor;
 225 } __packed;
 226
 227 struct  tpm_version_1_2_t {
 228         __be16  tag;
 229         u8      Major;
 230         u8      Minor;
 231         u8      revMajor;
 232         u8      revMinor;
 233 } __packed;
 234
 235 struct  timeout_t {
 236         __be32  a;
 237         __be32  b;
 238         __be32  c;
 239         __be32  d;
 240 } __packed;
 241
 242 struct duration_t {
 243         __be32  tpm_short;
 244         __be32  tpm_medium;
 245         __be32  tpm_long;
 246 } __packed;
 247
 248 struct permanent_flags_t {
 249         __be16  tag;
 250         u8      disable;
 251         u8      ownership;
 252         u8      deactivated;
 253         u8      readPubek;
 254         u8      disableOwnerClear;
 255         u8      allowMaintenance;
 256         u8      physicalPresenceLifetimeLock;
 257         u8      physicalPresenceHWEnable;
 258         u8      physicalPresenceCMDEnable;
 259         u8      CEKPUsed;
 260         u8      TPMpost;
 261         u8      TPMpostLock;
 262         u8      FIPS;
 263         u8      operator;
 264         u8      enableRevokeEK;
 265         u8      nvLocked;
 266         u8      readSRKPub;
 267         u8      tpmEstablished;
 268         u8      maintenanceDone;
 269         u8      disableFullDALogicInfo;
 270 } __packed;
 271
 272 typedef union {
 273         struct  permanent_flags_t perm_flags;
 274         struct  stclear_flags_t stclear_flags;
 275         bool    owned;
 276         __be32  num_pcrs;
 277         struct  tpm_version_t   tpm_version;
 278         struct  tpm_version_1_2_t tpm_version_1_2;
 279         __be32  manufacturer_id;
 280         struct timeout_t  timeout;
 281         struct duration_t duration;
 282 } cap_t;
 283
 284 enum tpm_capabilities {
 285         TPM_CAP_FLAG = cpu_to_be32(4),
 286         TPM_CAP_PROP = cpu_to_be32(5),
 287         CAP_VERSION_1_1 = cpu_to_be32(0x06),
 288         CAP_VERSION_1_2 = cpu_to_be32(0x1A)
 289 };
 290
 291 enum tpm_sub_capabilities {
 292         TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
 293         TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
 294         TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
 295         TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
 296         TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
 297         TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
 298         TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
 299
 300 };
 301
 302 struct  tpm_getcap_params_in {
 303         __be32  cap;
 304         __be32  subcap_size;
 305         __be32  subcap;
 306 } __packed;
 307
 308 struct  tpm_getcap_params_out {
 309         __be32  cap_size;
 310         cap_t   cap;
 311 } __packed;
 312
 313 struct  tpm_readpubek_params_out {
 314         u8      algorithm[4];
 315         u8      encscheme[2];
 316         u8      sigscheme[2];
 317         __be32  paramsize;
 318         u8      parameters[12]; /*assuming RSA*/
 319         __be32  keysize;
 320         u8      modulus[256];
 321         u8      checksum[20];
 322 } __packed;
 323
 324 typedef union {
 325         struct  tpm_input_header in;
 326         struct  tpm_output_header out;
 327 } tpm_cmd_header;
 328
 329 struct tpm_pcrread_out {
 330         u8      pcr_result[TPM_DIGEST_SIZE];
 331 } __packed;
 332
 333 struct tpm_pcrread_in {
 334         __be32  pcr_idx;
 335 } __packed;
 336
 337 struct tpm_pcrextend_in {
 338         __be32  pcr_idx;
 339         u8      hash[TPM_DIGEST_SIZE];
 340 } __packed;
 341
 342 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
 343  * bytes, but 128 is still a relatively large number of random bytes and
 344  * anything much bigger causes users of struct tpm_cmd_t to start getting
 345  * compiler warnings about stack frame size. */
 346 #define TPM_MAX_RNG_DATA        128
 347
 348 struct tpm_getrandom_out {
 349         __be32 rng_data_len;
 350         u8     rng_data[TPM_MAX_RNG_DATA];
 351 } __packed;
 352
 353 struct tpm_getrandom_in {
 354         __be32 num_bytes;
 355 } __packed;
 356
 357 struct tpm_startup_in {
 358         __be16  startup_type;
 359 } __packed;
 360
 361 typedef union {
 362         struct  tpm_getcap_params_out getcap_out;
 363         struct  tpm_readpubek_params_out readpubek_out;
 364         u8      readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
 365         struct  tpm_getcap_params_in getcap_in;
 366         struct  tpm_pcrread_in  pcrread_in;
 367         struct  tpm_pcrread_out pcrread_out;
 368         struct  tpm_pcrextend_in pcrextend_in;
 369         struct  tpm_getrandom_in getrandom_in;
 370         struct  tpm_getrandom_out getrandom_out;
 371         struct tpm_startup_in startup_in;
 372 } tpm_cmd_params;
 373
 374 struct tpm_cmd_t {
 375         tpm_cmd_header  header;
 376         tpm_cmd_params  params;
 377 } __packed;
 378
 379 /* A string buffer type for constructing TPM commands. This is based on the
 380  * ideas of string buffer code in security/keys/trusted.h but is heap based
 381  * in order to keep the stack usage minimal.
 382  */
 383
 384 enum tpm_buf_flags {
 385         TPM_BUF_OVERFLOW        = BIT(0),
 386 };
 387
 388 struct tpm_buf {
 389         struct page *data_page;
 390         unsigned int flags;
 391         u8 *data;
 392 };
 393
 394 static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
 395 {
 396         struct tpm_input_header *head;
 397
 398         buf->data_page = alloc_page(GFP_HIGHUSER);
 399         if (!buf->data_page)
 400                 return -ENOMEM;
 401
 402         buf->flags = 0;
 403         buf->data = kmap(buf->data_page);
 404
 405         head = (struct tpm_input_header *) buf->data;
 406
 407         head->tag = cpu_to_be16(tag);
 408         head->length = cpu_to_be32(sizeof(*head));
 409         head->ordinal = cpu_to_be32(ordinal);
 410
 411         return 0;
 412 }
 413
 414 static inline void tpm_buf_destroy(struct tpm_buf *buf)
 415 {
 416         kunmap(buf->data_page);
 417         __free_page(buf->data_page);
 418 }
 419
 420 static inline u32 tpm_buf_length(struct tpm_buf *buf)
 421 {
 422         struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
 423
 424         return be32_to_cpu(head->length);
 425 }
 426
 427 static inline u16 tpm_buf_tag(struct tpm_buf *buf)
 428 {
 429         struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
 430
 431         return be16_to_cpu(head->tag);
 432 }
 433
 434 static inline void tpm_buf_append(struct tpm_buf *buf,
 435                                   const unsigned char *new_data,
 436                                   unsigned int new_len)
 437 {
 438         struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
 439         u32 len = tpm_buf_length(buf);
 440
 441         /* Return silently if overflow has already happened. */
 442         if (buf->flags & TPM_BUF_OVERFLOW)
 443                 return;
 444
 445         if ((len + new_len) > PAGE_SIZE) {
 446                 WARN(1, "tpm_buf: overflow\n");
 447                 buf->flags |= TPM_BUF_OVERFLOW;
 448                 return;
 449         }
 450
 451         memcpy(&buf->data[len], new_data, new_len);
 452         head->length = cpu_to_be32(len + new_len);
 453 }
 454
 455 static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
 456 {
 457         tpm_buf_append(buf, &value, 1);
 458 }
 459
 460 static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
 461 {
 462         __be16 value2 = cpu_to_be16(value);
 463
 464         tpm_buf_append(buf, (u8 *) &value2, 2);
 465 }
 466
 467 static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
 468 {
 469         __be32 value2 = cpu_to_be32(value);
 470
 471         tpm_buf_append(buf, (u8 *) &value2, 4);
 472 }
 473
 474 extern struct class *tpm_class;
 475 extern dev_t tpm_devt;
 476 extern const struct file_operations tpm_fops;
 477 extern struct idr dev_nums_idr;
 478
 479 ssize_t tpm_getcap(struct tpm_chip *chip, __be32 subcap_id, cap_t *cap,
 480                    const char *desc);
 481 ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 482                      size_t bufsiz);
 483 ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd, int len,
 484                          const char *desc);
 485 extern int tpm_get_timeouts(struct tpm_chip *);
 486 extern void tpm_gen_interrupt(struct tpm_chip *);
 487 int tpm1_auto_startup(struct tpm_chip *chip);
 488 extern int tpm_do_selftest(struct tpm_chip *);
 489 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
 490 extern int tpm_pm_suspend(struct device *);
 491 extern int tpm_pm_resume(struct device *);
 492 extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
 493                              wait_queue_head_t *, bool);
 494
 495 struct tpm_chip *tpm_chip_find_get(int chip_num);
 496 __must_check int tpm_try_get_ops(struct tpm_chip *chip);
 497 void tpm_put_ops(struct tpm_chip *chip);
 498
 499 extern struct tpm_chip *tpm_chip_alloc(struct device *dev,
 500                                        const struct tpm_class_ops *ops);
 501 extern struct tpm_chip *tpmm_chip_alloc(struct device *pdev,
 502                                        const struct tpm_class_ops *ops);
 503 extern int tpm_chip_register(struct tpm_chip *chip);
 504 extern void tpm_chip_unregister(struct tpm_chip *chip);
 505
 506 void tpm_sysfs_add_device(struct tpm_chip *chip);
 507
 508 int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
 509
 510 #ifdef CONFIG_ACPI
 511 extern void tpm_add_ppi(struct tpm_chip *chip);
 512 #else
 513 static inline void tpm_add_ppi(struct tpm_chip *chip)
 514 {
 515 }
 516 #endif
 517
 518 int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
 519 int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
 520 int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
 521 int tpm2_seal_trusted(struct tpm_chip *chip,
 522                       struct trusted_key_payload *payload,
 523                       struct trusted_key_options *options);
 524 int tpm2_unseal_trusted(struct tpm_chip *chip,
 525                         struct trusted_key_payload *payload,
 526                         struct trusted_key_options *options);
 527 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
 528                         u32 *value, const char *desc);
 529
 530 int tpm2_auto_startup(struct tpm_chip *chip);
 531 extern void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
 532 extern unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32);
 533 extern int tpm2_gen_interrupt(struct tpm_chip *chip);
 534 extern int tpm2_probe(struct tpm_chip *chip);
 535 #endif