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 #include <linux/module.h>
  23 #include <linux/delay.h>
  24 #include <linux/fs.h>
  25 #include <linux/mutex.h>
  26 #include <linux/sched.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/io.h>
  29 #include <linux/tpm.h>
  30 #include <linux/acpi.h>
  31 #include <linux/cdev.h>
  32 #include <linux/highmem.h>
  33
  34 enum tpm_const {
  35         TPM_MINOR = 224,        /* officially assigned */
  36         TPM_BUFSIZE = 4096,
  37         TPM_NUM_DEVICES = 256,
  38         TPM_RETRY = 50,         /* 5 seconds */
  39 };
  40
  41 enum tpm_timeout {
  42         TPM_TIMEOUT = 5,        /* msecs */
  43         TPM_TIMEOUT_RETRY = 100 /* msecs */
  44 };
  45
  46 /* TPM addresses */
  47 enum tpm_addr {
  48         TPM_SUPERIO_ADDR = 0x2E,
  49         TPM_ADDR = 0x4E,
  50 };
  51
  52 /* Indexes the duration array */
  53 enum tpm_duration {
  54         TPM_SHORT = 0,
  55         TPM_MEDIUM = 1,
  56         TPM_LONG = 2,
  57         TPM_UNDEFINED,
  58 };
  59
  60 #define TPM_WARN_RETRY          0x800
  61 #define TPM_WARN_DOING_SELFTEST 0x802
  62 #define TPM_ERR_DEACTIVATED     0x6
  63 #define TPM_ERR_DISABLED        0x7
  64 #define TPM_ERR_INVALID_POSTINIT 38
  65
  66 #define TPM_HEADER_SIZE         10
  67
  68 enum tpm2_const {
  69         TPM2_PLATFORM_PCR       = 24,
  70         TPM2_PCR_SELECT_MIN     = ((TPM2_PLATFORM_PCR + 7) / 8),
  71         TPM2_TIMEOUT_A          = 750,
  72         TPM2_TIMEOUT_B          = 2000,
  73         TPM2_TIMEOUT_C          = 200,
  74         TPM2_TIMEOUT_D          = 30,
  75         TPM2_DURATION_SHORT     = 20,
  76         TPM2_DURATION_MEDIUM    = 750,
  77         TPM2_DURATION_LONG      = 2000,
  78 };
  79
  80 enum tpm2_structures {
  81         TPM2_ST_NO_SESSIONS     = 0x8001,
  82         TPM2_ST_SESSIONS        = 0x8002,
  83 };
  84
  85 enum tpm2_return_codes {
  86         TPM2_RC_HASH            = 0x0083, /* RC_FMT1 */
  87         TPM2_RC_INITIALIZE      = 0x0100, /* RC_VER1 */
  88         TPM2_RC_DISABLED        = 0x0120,
  89         TPM2_RC_TESTING         = 0x090A, /* RC_WARN */
  90 };
  91
  92 enum tpm2_algorithms {
  93         TPM2_ALG_SHA1           = 0x0004,
  94         TPM2_ALG_KEYEDHASH      = 0x0008,
  95         TPM2_ALG_SHA256         = 0x000B,
  96         TPM2_ALG_SHA384         = 0x000C,
  97         TPM2_ALG_SHA512         = 0x000D,
  98         TPM2_ALG_NULL           = 0x0010,
  99         TPM2_ALG_SM3_256        = 0x0012,
 100 };
 101
 102 enum tpm2_command_codes {
 103         TPM2_CC_FIRST           = 0x011F,
 104         TPM2_CC_SELF_TEST       = 0x0143,
 105         TPM2_CC_STARTUP         = 0x0144,
 106         TPM2_CC_SHUTDOWN        = 0x0145,
 107         TPM2_CC_CREATE          = 0x0153,
 108         TPM2_CC_LOAD            = 0x0157,
 109         TPM2_CC_UNSEAL          = 0x015E,
 110         TPM2_CC_FLUSH_CONTEXT   = 0x0165,
 111         TPM2_CC_GET_CAPABILITY  = 0x017A,
 112         TPM2_CC_GET_RANDOM      = 0x017B,
 113         TPM2_CC_PCR_READ        = 0x017E,
 114         TPM2_CC_PCR_EXTEND      = 0x0182,
 115         TPM2_CC_LAST            = 0x018F,
 116 };
 117
 118 enum tpm2_permanent_handles {
 119         TPM2_RS_PW              = 0x40000009,
 120 };
 121
 122 enum tpm2_capabilities {
 123         TPM2_CAP_TPM_PROPERTIES = 6,
 124 };
 125
 126 enum tpm2_startup_types {
 127         TPM2_SU_CLEAR   = 0x0000,
 128         TPM2_SU_STATE   = 0x0001,
 129 };
 130
 131 enum tpm2_start_method {
 132         TPM2_START_ACPI = 2,
 133         TPM2_START_FIFO = 6,
 134         TPM2_START_CRB = 7,
 135         TPM2_START_CRB_WITH_ACPI = 8,
 136 };
 137
 138 struct tpm_chip;
 139
 140 struct tpm_vendor_specific {
 141         void __iomem *iobase;           /* ioremapped address */
 142         unsigned long base;             /* TPM base address */
 143
 144         int irq;
 145
 146         int region_size;
 147         int have_region;
 148
 149         struct list_head list;
 150         int locality;
 151         unsigned long timeout_a, timeout_b, timeout_c, timeout_d; /* jiffies */
 152         bool timeout_adjusted;
 153         unsigned long duration[3]; /* jiffies */
 154         bool duration_adjusted;
 155         void *priv;
 156
 157         wait_queue_head_t read_queue;
 158         wait_queue_head_t int_queue;
 159
 160         u16 manufacturer_id;
 161 };
 162
 163 #define TPM_VPRIV(c)     ((c)->vendor.priv)
 164
 165 #define TPM_VID_INTEL    0x8086
 166 #define TPM_VID_WINBOND  0x1050
 167 #define TPM_VID_STM      0x104A
 168
 169 #define TPM_PPI_VERSION_LEN             3
 170
 171 enum tpm_chip_flags {
 172         TPM_CHIP_FLAG_REGISTERED        = BIT(0),
 173         TPM_CHIP_FLAG_TPM2              = BIT(1),
 174 };
 175
 176 struct tpm_chip {
 177         struct device *pdev;    /* Device stuff */
 178         struct device dev;
 179         struct cdev cdev;
 180
 181         const struct tpm_class_ops *ops;
 182         unsigned int flags;
 183
 184         int dev_num;            /* /dev/tpm# */
 185         char devname[7];
 186         unsigned long is_open;  /* only one allowed */
 187         int time_expired;
 188
 189         struct mutex tpm_mutex; /* tpm is processing */
 190
 191         struct tpm_vendor_specific vendor;
 192
 193         struct dentry **bios_dir;
 194
 195 #ifdef CONFIG_ACPI
 196         const struct attribute_group *groups[2];
 197         unsigned int groups_cnt;
 198         acpi_handle acpi_dev_handle;
 199         char ppi_version[TPM_PPI_VERSION_LEN + 1];
 200 #endif /* CONFIG_ACPI */
 201
 202         struct list_head list;
 203 };
 204
 205 #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
 206
 207 static inline void tpm_chip_put(struct tpm_chip *chip)
 208 {
 209         module_put(chip->pdev->driver->owner);
 210 }
 211
 212 static inline int tpm_read_index(int base, int index)
 213 {
 214         outb(index, base);
 215         return inb(base+1) & 0xFF;
 216 }
 217
 218 static inline void tpm_write_index(int base, int index, int value)
 219 {
 220         outb(index, base);
 221         outb(value & 0xFF, base+1);
 222 }
 223 struct tpm_input_header {
 224         __be16  tag;
 225         __be32  length;
 226         __be32  ordinal;
 227 } __packed;
 228
 229 struct tpm_output_header {
 230         __be16  tag;
 231         __be32  length;
 232         __be32  return_code;
 233 } __packed;
 234
 235 #define TPM_TAG_RQU_COMMAND cpu_to_be16(193)
 236
 237 struct  stclear_flags_t {
 238         __be16  tag;
 239         u8      deactivated;
 240         u8      disableForceClear;
 241         u8      physicalPresence;
 242         u8      physicalPresenceLock;
 243         u8      bGlobalLock;
 244 } __packed;
 245
 246 struct  tpm_version_t {
 247         u8      Major;
 248         u8      Minor;
 249         u8      revMajor;
 250         u8      revMinor;
 251 } __packed;
 252
 253 struct  tpm_version_1_2_t {
 254         __be16  tag;
 255         u8      Major;
 256         u8      Minor;
 257         u8      revMajor;
 258         u8      revMinor;
 259 } __packed;
 260
 261 struct  timeout_t {
 262         __be32  a;
 263         __be32  b;
 264         __be32  c;
 265         __be32  d;
 266 } __packed;
 267
 268 struct duration_t {
 269         __be32  tpm_short;
 270         __be32  tpm_medium;
 271         __be32  tpm_long;
 272 } __packed;
 273
 274 struct permanent_flags_t {
 275         __be16  tag;
 276         u8      disable;
 277         u8      ownership;
 278         u8      deactivated;
 279         u8      readPubek;
 280         u8      disableOwnerClear;
 281         u8      allowMaintenance;
 282         u8      physicalPresenceLifetimeLock;
 283         u8      physicalPresenceHWEnable;
 284         u8      physicalPresenceCMDEnable;
 285         u8      CEKPUsed;
 286         u8      TPMpost;
 287         u8      TPMpostLock;
 288         u8      FIPS;
 289         u8      operator;
 290         u8      enableRevokeEK;
 291         u8      nvLocked;
 292         u8      readSRKPub;
 293         u8      tpmEstablished;
 294         u8      maintenanceDone;
 295         u8      disableFullDALogicInfo;
 296 } __packed;
 297
 298 typedef union {
 299         struct  permanent_flags_t perm_flags;
 300         struct  stclear_flags_t stclear_flags;
 301         bool    owned;
 302         __be32  num_pcrs;
 303         struct  tpm_version_t   tpm_version;
 304         struct  tpm_version_1_2_t tpm_version_1_2;
 305         __be32  manufacturer_id;
 306         struct timeout_t  timeout;
 307         struct duration_t duration;
 308 } cap_t;
 309
 310 enum tpm_capabilities {
 311         TPM_CAP_FLAG = cpu_to_be32(4),
 312         TPM_CAP_PROP = cpu_to_be32(5),
 313         CAP_VERSION_1_1 = cpu_to_be32(0x06),
 314         CAP_VERSION_1_2 = cpu_to_be32(0x1A)
 315 };
 316
 317 enum tpm_sub_capabilities {
 318         TPM_CAP_PROP_PCR = cpu_to_be32(0x101),
 319         TPM_CAP_PROP_MANUFACTURER = cpu_to_be32(0x103),
 320         TPM_CAP_FLAG_PERM = cpu_to_be32(0x108),
 321         TPM_CAP_FLAG_VOL = cpu_to_be32(0x109),
 322         TPM_CAP_PROP_OWNER = cpu_to_be32(0x111),
 323         TPM_CAP_PROP_TIS_TIMEOUT = cpu_to_be32(0x115),
 324         TPM_CAP_PROP_TIS_DURATION = cpu_to_be32(0x120),
 325
 326 };
 327
 328 struct  tpm_getcap_params_in {
 329         __be32  cap;
 330         __be32  subcap_size;
 331         __be32  subcap;
 332 } __packed;
 333
 334 struct  tpm_getcap_params_out {
 335         __be32  cap_size;
 336         cap_t   cap;
 337 } __packed;
 338
 339 struct  tpm_readpubek_params_out {
 340         u8      algorithm[4];
 341         u8      encscheme[2];
 342         u8      sigscheme[2];
 343         __be32  paramsize;
 344         u8      parameters[12]; /*assuming RSA*/
 345         __be32  keysize;
 346         u8      modulus[256];
 347         u8      checksum[20];
 348 } __packed;
 349
 350 typedef union {
 351         struct  tpm_input_header in;
 352         struct  tpm_output_header out;
 353 } tpm_cmd_header;
 354
 355 struct tpm_pcrread_out {
 356         u8      pcr_result[TPM_DIGEST_SIZE];
 357 } __packed;
 358
 359 struct tpm_pcrread_in {
 360         __be32  pcr_idx;
 361 } __packed;
 362
 363 struct tpm_pcrextend_in {
 364         __be32  pcr_idx;
 365         u8      hash[TPM_DIGEST_SIZE];
 366 } __packed;
 367
 368 /* 128 bytes is an arbitrary cap. This could be as large as TPM_BUFSIZE - 18
 369  * bytes, but 128 is still a relatively large number of random bytes and
 370  * anything much bigger causes users of struct tpm_cmd_t to start getting
 371  * compiler warnings about stack frame size. */
 372 #define TPM_MAX_RNG_DATA        128
 373
 374 struct tpm_getrandom_out {
 375         __be32 rng_data_len;
 376         u8     rng_data[TPM_MAX_RNG_DATA];
 377 } __packed;
 378
 379 struct tpm_getrandom_in {
 380         __be32 num_bytes;
 381 } __packed;
 382
 383 struct tpm_startup_in {
 384         __be16  startup_type;
 385 } __packed;
 386
 387 typedef union {
 388         struct  tpm_getcap_params_out getcap_out;
 389         struct  tpm_readpubek_params_out readpubek_out;
 390         u8      readpubek_out_buffer[sizeof(struct tpm_readpubek_params_out)];
 391         struct  tpm_getcap_params_in getcap_in;
 392         struct  tpm_pcrread_in  pcrread_in;
 393         struct  tpm_pcrread_out pcrread_out;
 394         struct  tpm_pcrextend_in pcrextend_in;
 395         struct  tpm_getrandom_in getrandom_in;
 396         struct  tpm_getrandom_out getrandom_out;
 397         struct tpm_startup_in startup_in;
 398 } tpm_cmd_params;
 399
 400 struct tpm_cmd_t {
 401         tpm_cmd_header  header;
 402         tpm_cmd_params  params;
 403 } __packed;
 404
 405 /* A string buffer type for constructing TPM commands. This is based on the
 406  * ideas of string buffer code in security/keys/trusted.h but is heap based
 407  * in order to keep the stack usage minimal.
 408  */
 409
 410 enum tpm_buf_flags {
 411         TPM_BUF_OVERFLOW        = BIT(0),
 412 };
 413
 414 struct tpm_buf {
 415         struct page *data_page;
 416         unsigned int flags;
 417         u8 *data;
 418 };
 419
 420 static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
 421 {
 422         struct tpm_input_header *head;
 423
 424         buf->data_page = alloc_page(GFP_HIGHUSER);
 425         if (!buf->data_page)
 426                 return -ENOMEM;
 427
 428         buf->flags = 0;
 429         buf->data = kmap(buf->data_page);
 430
 431         head = (struct tpm_input_header *) buf->data;
 432
 433         head->tag = cpu_to_be16(tag);
 434         head->length = cpu_to_be32(sizeof(*head));
 435         head->ordinal = cpu_to_be32(ordinal);
 436
 437         return 0;
 438 }
 439
 440 static inline void tpm_buf_destroy(struct tpm_buf *buf)
 441 {
 442         kunmap(buf->data_page);
 443         __free_page(buf->data_page);
 444 }
 445
 446 static inline u32 tpm_buf_length(struct tpm_buf *buf)
 447 {
 448         struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
 449
 450         return be32_to_cpu(head->length);
 451 }
 452
 453 static inline u16 tpm_buf_tag(struct tpm_buf *buf)
 454 {
 455         struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
 456
 457         return be16_to_cpu(head->tag);
 458 }
 459
 460 static inline void tpm_buf_append(struct tpm_buf *buf,
 461                                   const unsigned char *new_data,
 462                                   unsigned int new_len)
 463 {
 464         struct tpm_input_header *head = (struct tpm_input_header *) buf->data;
 465         u32 len = tpm_buf_length(buf);
 466
 467         /* Return silently if overflow has already happened. */
 468         if (buf->flags & TPM_BUF_OVERFLOW)
 469                 return;
 470
 471         if ((len + new_len) > PAGE_SIZE) {
 472                 WARN(1, "tpm_buf: overflow\n");
 473                 buf->flags |= TPM_BUF_OVERFLOW;
 474                 return;
 475         }
 476
 477         memcpy(&buf->data[len], new_data, new_len);
 478         head->length = cpu_to_be32(len + new_len);
 479 }
 480
 481 static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
 482 {
 483         tpm_buf_append(buf, &value, 1);
 484 }
 485
 486 static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
 487 {
 488         __be16 value2 = cpu_to_be16(value);
 489
 490         tpm_buf_append(buf, (u8 *) &value2, 2);
 491 }
 492
 493 static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
 494 {
 495         __be32 value2 = cpu_to_be32(value);
 496
 497         tpm_buf_append(buf, (u8 *) &value2, 4);
 498 }
 499
 500 extern struct class *tpm_class;
 501 extern dev_t tpm_devt;
 502 extern const struct file_operations tpm_fops;
 503
 504 ssize_t tpm_getcap(struct device *, __be32, cap_t *, const char *);
 505 ssize_t tpm_transmit(struct tpm_chip *chip, const char *buf,
 506                      size_t bufsiz);
 507 ssize_t tpm_transmit_cmd(struct tpm_chip *chip, void *cmd, int len,
 508                          const char *desc);
 509 extern int tpm_get_timeouts(struct tpm_chip *);
 510 extern void tpm_gen_interrupt(struct tpm_chip *);
 511 extern int tpm_do_selftest(struct tpm_chip *);
 512 extern unsigned long tpm_calc_ordinal_duration(struct tpm_chip *, u32);
 513 extern int tpm_pm_suspend(struct device *);
 514 extern int tpm_pm_resume(struct device *);
 515 extern int wait_for_tpm_stat(struct tpm_chip *, u8, unsigned long,
 516                              wait_queue_head_t *, bool);
 517
 518 struct tpm_chip *tpm_chip_find_get(int chip_num);
 519 extern struct tpm_chip *tpmm_chip_alloc(struct device *dev,
 520                                        const struct tpm_class_ops *ops);
 521 extern int tpm_chip_register(struct tpm_chip *chip);
 522 extern void tpm_chip_unregister(struct tpm_chip *chip);
 523
 524 int tpm_sysfs_add_device(struct tpm_chip *chip);
 525 void tpm_sysfs_del_device(struct tpm_chip *chip);
 526
 527 int tpm_pcr_read_dev(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
 528
 529 #ifdef CONFIG_ACPI
 530 extern void tpm_add_ppi(struct tpm_chip *chip);
 531 #else
 532 static inline void tpm_add_ppi(struct tpm_chip *chip)
 533 {
 534 }
 535 #endif
 536
 537 int tpm2_pcr_read(struct tpm_chip *chip, int pcr_idx, u8 *res_buf);
 538 int tpm2_pcr_extend(struct tpm_chip *chip, int pcr_idx, const u8 *hash);
 539 int tpm2_get_random(struct tpm_chip *chip, u8 *out, size_t max);
 540 int tpm2_seal_trusted(struct tpm_chip *chip,
 541                       struct trusted_key_payload *payload,
 542                       struct trusted_key_options *options);
 543 int tpm2_unseal_trusted(struct tpm_chip *chip,
 544                         struct trusted_key_payload *payload,
 545                         struct trusted_key_options *options);
 546 ssize_t tpm2_get_tpm_pt(struct tpm_chip *chip, u32 property_id,
 547                         u32 *value, const char *desc);
 548
 549 extern int tpm2_startup(struct tpm_chip *chip, u16 startup_type);
 550 extern void tpm2_shutdown(struct tpm_chip *chip, u16 shutdown_type);
 551 extern unsigned long tpm2_calc_ordinal_duration(struct tpm_chip *, u32);
 552 extern int tpm2_do_selftest(struct tpm_chip *chip);
 553 extern int tpm2_gen_interrupt(struct tpm_chip *chip);
 554 extern int tpm2_probe(struct tpm_chip *chip);