include/linux/tpm.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  * Copyright (C) 2004,2007,2008 IBM 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  * Debora Velarde <dvelarde@us.ibm.com>
  11  *
  12  * Maintained by: <tpmdd_devel@lists.sourceforge.net>
  13  *
  14  * Device driver for TCG/TCPA TPM (trusted platform module).
  15  * Specifications at www.trustedcomputinggroup.org
  16  */
  17 #ifndef __LINUX_TPM_H__
  18 #define __LINUX_TPM_H__
  19
  20 #include <linux/hw_random.h>
  21 #include <linux/acpi.h>
  22 #include <linux/cdev.h>
  23 #include <linux/fs.h>
  24 #include <linux/highmem.h>
  25 #include <crypto/hash_info.h>
  26
  27 #define TPM_DIGEST_SIZE 20      /* Max TPM v1.2 PCR size */
  28 #define TPM_MAX_DIGEST_SIZE SHA512_DIGEST_SIZE
  29
  30 struct tpm_chip;
  31 struct trusted_key_payload;
  32 struct trusted_key_options;
  33
  34 enum tpm_algorithms {
  35         TPM_ALG_ERROR           = 0x0000,
  36         TPM_ALG_SHA1            = 0x0004,
  37         TPM_ALG_KEYEDHASH       = 0x0008,
  38         TPM_ALG_SHA256          = 0x000B,
  39         TPM_ALG_SHA384          = 0x000C,
  40         TPM_ALG_SHA512          = 0x000D,
  41         TPM_ALG_NULL            = 0x0010,
  42         TPM_ALG_SM3_256         = 0x0012,
  43 };
  44
  45 struct tpm_digest {
  46         u16 alg_id;
  47         u8 digest[TPM_MAX_DIGEST_SIZE];
  48 } __packed;
  49
  50 struct tpm_bank_info {
  51         u16 alg_id;
  52         u16 digest_size;
  53         u16 crypto_id;
  54 };
  55
  56 enum TPM_OPS_FLAGS {
  57         TPM_OPS_AUTO_STARTUP = BIT(0),
  58 };
  59
  60 struct tpm_class_ops {
  61         unsigned int flags;
  62         const u8 req_complete_mask;
  63         const u8 req_complete_val;
  64         bool (*req_canceled)(struct tpm_chip *chip, u8 status);
  65         int (*recv) (struct tpm_chip *chip, u8 *buf, size_t len);
  66         int (*send) (struct tpm_chip *chip, u8 *buf, size_t len);
  67         void (*cancel) (struct tpm_chip *chip);
  68         u8 (*status) (struct tpm_chip *chip);
  69         void (*update_timeouts)(struct tpm_chip *chip,
  70                                 unsigned long *timeout_cap);
  71         void (*update_durations)(struct tpm_chip *chip,
  72                                  unsigned long *duration_cap);
  73         int (*go_idle)(struct tpm_chip *chip);
  74         int (*cmd_ready)(struct tpm_chip *chip);
  75         int (*request_locality)(struct tpm_chip *chip, int loc);
  76         int (*relinquish_locality)(struct tpm_chip *chip, int loc);
  77         void (*clk_enable)(struct tpm_chip *chip, bool value);
  78 };
  79
  80 #define TPM_NUM_EVENT_LOG_FILES         3
  81
  82 /* Indexes the duration array */
  83 enum tpm_duration {
  84         TPM_SHORT = 0,
  85         TPM_MEDIUM = 1,
  86         TPM_LONG = 2,
  87         TPM_LONG_LONG = 3,
  88         TPM_UNDEFINED,
  89         TPM_NUM_DURATIONS = TPM_UNDEFINED,
  90 };
  91
  92 #define TPM_PPI_VERSION_LEN             3
  93
  94 struct tpm_space {
  95         u32 context_tbl[3];
  96         u8 *context_buf;
  97         u32 session_tbl[3];
  98         u8 *session_buf;
  99 };
 100
 101 struct tpm_bios_log {
 102         void *bios_event_log;
 103         void *bios_event_log_end;
 104 };
 105
 106 struct tpm_chip_seqops {
 107         struct tpm_chip *chip;
 108         const struct seq_operations *seqops;
 109 };
 110
 111 struct tpm_chip {
 112         struct device dev;
 113         struct device devs;
 114         struct cdev cdev;
 115         struct cdev cdevs;
 116
 117         /* A driver callback under ops cannot be run unless ops_sem is held
 118          * (sometimes implicitly, eg for the sysfs code). ops becomes null
 119          * when the driver is unregistered, see tpm_try_get_ops.
 120          */
 121         struct rw_semaphore ops_sem;
 122         const struct tpm_class_ops *ops;
 123
 124         struct tpm_bios_log log;
 125         struct tpm_chip_seqops bin_log_seqops;
 126         struct tpm_chip_seqops ascii_log_seqops;
 127
 128         unsigned int flags;
 129
 130         int dev_num;            /* /dev/tpm# */
 131         unsigned long is_open;  /* only one allowed */
 132
 133         char hwrng_name[64];
 134         struct hwrng hwrng;
 135
 136         struct mutex tpm_mutex; /* tpm is processing */
 137
 138         unsigned long timeout_a; /* jiffies */
 139         unsigned long timeout_b; /* jiffies */
 140         unsigned long timeout_c; /* jiffies */
 141         unsigned long timeout_d; /* jiffies */
 142         bool timeout_adjusted;
 143         unsigned long duration[TPM_NUM_DURATIONS]; /* jiffies */
 144         bool duration_adjusted;
 145
 146         struct dentry *bios_dir[TPM_NUM_EVENT_LOG_FILES];
 147
 148         const struct attribute_group *groups[3];
 149         unsigned int groups_cnt;
 150
 151         u32 nr_allocated_banks;
 152         struct tpm_bank_info *allocated_banks;
 153 #ifdef CONFIG_ACPI
 154         acpi_handle acpi_dev_handle;
 155         char ppi_version[TPM_PPI_VERSION_LEN + 1];
 156 #endif /* CONFIG_ACPI */
 157
 158         struct tpm_space work_space;
 159         u32 last_cc;
 160         u32 nr_commands;
 161         u32 *cc_attrs_tbl;
 162
 163         /* active locality */
 164         int locality;
 165 };
 166
 167 #define TPM_HEADER_SIZE         10
 168
 169 enum tpm2_const {
 170         TPM2_PLATFORM_PCR       =     24,
 171         TPM2_PCR_SELECT_MIN     = ((TPM2_PLATFORM_PCR + 7) / 8),
 172 };
 173
 174 enum tpm2_timeouts {
 175         TPM2_TIMEOUT_A          =    750,
 176         TPM2_TIMEOUT_B          =   2000,
 177         TPM2_TIMEOUT_C          =    200,
 178         TPM2_TIMEOUT_D          =     30,
 179         TPM2_DURATION_SHORT     =     20,
 180         TPM2_DURATION_MEDIUM    =    750,
 181         TPM2_DURATION_LONG      =   2000,
 182         TPM2_DURATION_LONG_LONG = 300000,
 183         TPM2_DURATION_DEFAULT   = 120000,
 184 };
 185
 186 enum tpm2_structures {
 187         TPM2_ST_NO_SESSIONS     = 0x8001,
 188         TPM2_ST_SESSIONS        = 0x8002,
 189 };
 190
 191 /* Indicates from what layer of the software stack the error comes from */
 192 #define TSS2_RC_LAYER_SHIFT      16
 193 #define TSS2_RESMGR_TPM_RC_LAYER (11 << TSS2_RC_LAYER_SHIFT)
 194
 195 enum tpm2_return_codes {
 196         TPM2_RC_SUCCESS         = 0x0000,
 197         TPM2_RC_HASH            = 0x0083, /* RC_FMT1 */
 198         TPM2_RC_HANDLE          = 0x008B,
 199         TPM2_RC_INITIALIZE      = 0x0100, /* RC_VER1 */
 200         TPM2_RC_FAILURE         = 0x0101,
 201         TPM2_RC_DISABLED        = 0x0120,
 202         TPM2_RC_COMMAND_CODE    = 0x0143,
 203         TPM2_RC_TESTING         = 0x090A, /* RC_WARN */
 204         TPM2_RC_REFERENCE_H0    = 0x0910,
 205         TPM2_RC_RETRY           = 0x0922,
 206 };
 207
 208 enum tpm2_command_codes {
 209         TPM2_CC_FIRST                   = 0x011F,
 210         TPM2_CC_HIERARCHY_CONTROL       = 0x0121,
 211         TPM2_CC_HIERARCHY_CHANGE_AUTH   = 0x0129,
 212         TPM2_CC_CREATE_PRIMARY          = 0x0131,
 213         TPM2_CC_SEQUENCE_COMPLETE       = 0x013E,
 214         TPM2_CC_SELF_TEST               = 0x0143,
 215         TPM2_CC_STARTUP                 = 0x0144,
 216         TPM2_CC_SHUTDOWN                = 0x0145,
 217         TPM2_CC_NV_READ                 = 0x014E,
 218         TPM2_CC_CREATE                  = 0x0153,
 219         TPM2_CC_LOAD                    = 0x0157,
 220         TPM2_CC_SEQUENCE_UPDATE         = 0x015C,
 221         TPM2_CC_UNSEAL                  = 0x015E,
 222         TPM2_CC_CONTEXT_LOAD            = 0x0161,
 223         TPM2_CC_CONTEXT_SAVE            = 0x0162,
 224         TPM2_CC_FLUSH_CONTEXT           = 0x0165,
 225         TPM2_CC_VERIFY_SIGNATURE        = 0x0177,
 226         TPM2_CC_GET_CAPABILITY          = 0x017A,
 227         TPM2_CC_GET_RANDOM              = 0x017B,
 228         TPM2_CC_PCR_READ                = 0x017E,
 229         TPM2_CC_PCR_EXTEND              = 0x0182,
 230         TPM2_CC_EVENT_SEQUENCE_COMPLETE = 0x0185,
 231         TPM2_CC_HASH_SEQUENCE_START     = 0x0186,
 232         TPM2_CC_CREATE_LOADED           = 0x0191,
 233         TPM2_CC_LAST                    = 0x0193, /* Spec 1.36 */
 234 };
 235
 236 enum tpm2_permanent_handles {
 237         TPM2_RS_PW              = 0x40000009,
 238 };
 239
 240 enum tpm2_capabilities {
 241         TPM2_CAP_HANDLES        = 1,
 242         TPM2_CAP_COMMANDS       = 2,
 243         TPM2_CAP_PCRS           = 5,
 244         TPM2_CAP_TPM_PROPERTIES = 6,
 245 };
 246
 247 enum tpm2_properties {
 248         TPM_PT_TOTAL_COMMANDS   = 0x0129,
 249 };
 250
 251 enum tpm2_startup_types {
 252         TPM2_SU_CLEAR   = 0x0000,
 253         TPM2_SU_STATE   = 0x0001,
 254 };
 255
 256 enum tpm2_cc_attrs {
 257         TPM2_CC_ATTR_CHANDLES   = 25,
 258         TPM2_CC_ATTR_RHANDLE    = 28,
 259 };
 260
 261 #define TPM_VID_INTEL    0x8086
 262 #define TPM_VID_WINBOND  0x1050
 263 #define TPM_VID_STM      0x104A
 264
 265 enum tpm_chip_flags {
 266         TPM_CHIP_FLAG_TPM2              = BIT(1),
 267         TPM_CHIP_FLAG_IRQ               = BIT(2),
 268         TPM_CHIP_FLAG_VIRTUAL           = BIT(3),
 269         TPM_CHIP_FLAG_HAVE_TIMEOUTS     = BIT(4),
 270         TPM_CHIP_FLAG_ALWAYS_POWERED    = BIT(5),
 271         TPM_CHIP_FLAG_FIRMWARE_POWER_MANAGED    = BIT(6),
 272 };
 273
 274 #define to_tpm_chip(d) container_of(d, struct tpm_chip, dev)
 275
 276 struct tpm_header {
 277         __be16 tag;
 278         __be32 length;
 279         union {
 280                 __be32 ordinal;
 281                 __be32 return_code;
 282         };
 283 } __packed;
 284
 285 /* A string buffer type for constructing TPM commands. This is based on the
 286  * ideas of string buffer code in security/keys/trusted.h but is heap based
 287  * in order to keep the stack usage minimal.
 288  */
 289
 290 enum tpm_buf_flags {
 291         TPM_BUF_OVERFLOW        = BIT(0),
 292 };
 293
 294 struct tpm_buf {
 295         unsigned int flags;
 296         u8 *data;
 297 };
 298
 299 enum tpm2_object_attributes {
 300         TPM2_OA_USER_WITH_AUTH          = BIT(6),
 301 };
 302
 303 enum tpm2_session_attributes {
 304         TPM2_SA_CONTINUE_SESSION        = BIT(0),
 305 };
 306
 307 struct tpm2_hash {
 308         unsigned int crypto_id;
 309         unsigned int tpm_id;
 310 };
 311
 312 static inline void tpm_buf_reset(struct tpm_buf *buf, u16 tag, u32 ordinal)
 313 {
 314         struct tpm_header *head = (struct tpm_header *)buf->data;
 315
 316         head->tag = cpu_to_be16(tag);
 317         head->length = cpu_to_be32(sizeof(*head));
 318         head->ordinal = cpu_to_be32(ordinal);
 319 }
 320
 321 static inline int tpm_buf_init(struct tpm_buf *buf, u16 tag, u32 ordinal)
 322 {
 323         buf->data = (u8 *)__get_free_page(GFP_KERNEL);
 324         if (!buf->data)
 325                 return -ENOMEM;
 326
 327         buf->flags = 0;
 328         tpm_buf_reset(buf, tag, ordinal);
 329         return 0;
 330 }
 331
 332 static inline void tpm_buf_destroy(struct tpm_buf *buf)
 333 {
 334         free_page((unsigned long)buf->data);
 335 }
 336
 337 static inline u32 tpm_buf_length(struct tpm_buf *buf)
 338 {
 339         struct tpm_header *head = (struct tpm_header *)buf->data;
 340
 341         return be32_to_cpu(head->length);
 342 }
 343
 344 static inline u16 tpm_buf_tag(struct tpm_buf *buf)
 345 {
 346         struct tpm_header *head = (struct tpm_header *)buf->data;
 347
 348         return be16_to_cpu(head->tag);
 349 }
 350
 351 static inline void tpm_buf_append(struct tpm_buf *buf,
 352                                   const unsigned char *new_data,
 353                                   unsigned int new_len)
 354 {
 355         struct tpm_header *head = (struct tpm_header *)buf->data;
 356         u32 len = tpm_buf_length(buf);
 357
 358         /* Return silently if overflow has already happened. */
 359         if (buf->flags & TPM_BUF_OVERFLOW)
 360                 return;
 361
 362         if ((len + new_len) > PAGE_SIZE) {
 363                 WARN(1, "tpm_buf: overflow\n");
 364                 buf->flags |= TPM_BUF_OVERFLOW;
 365                 return;
 366         }
 367
 368         memcpy(&buf->data[len], new_data, new_len);
 369         head->length = cpu_to_be32(len + new_len);
 370 }
 371
 372 static inline void tpm_buf_append_u8(struct tpm_buf *buf, const u8 value)
 373 {
 374         tpm_buf_append(buf, &value, 1);
 375 }
 376
 377 static inline void tpm_buf_append_u16(struct tpm_buf *buf, const u16 value)
 378 {
 379         __be16 value2 = cpu_to_be16(value);
 380
 381         tpm_buf_append(buf, (u8 *) &value2, 2);
 382 }
 383
 384 static inline void tpm_buf_append_u32(struct tpm_buf *buf, const u32 value)
 385 {
 386         __be32 value2 = cpu_to_be32(value);
 387
 388         tpm_buf_append(buf, (u8 *) &value2, 4);
 389 }
 390
 391 static inline u32 tpm2_rc_value(u32 rc)
 392 {
 393         return (rc & BIT(7)) ? rc & 0xff : rc;
 394 }
 395
 396 #if defined(CONFIG_TCG_TPM) || defined(CONFIG_TCG_TPM_MODULE)
 397
 398 extern int tpm_is_tpm2(struct tpm_chip *chip);
 399 extern int tpm_pcr_read(struct tpm_chip *chip, u32 pcr_idx,
 400                         struct tpm_digest *digest);
 401 extern int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
 402                           struct tpm_digest *digests);
 403 extern int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen);
 404 extern int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max);
 405 extern struct tpm_chip *tpm_default_chip(void);
 406 #else
 407 static inline int tpm_is_tpm2(struct tpm_chip *chip)
 408 {
 409         return -ENODEV;
 410 }
 411
 412 static inline int tpm_pcr_read(struct tpm_chip *chip, int pcr_idx,
 413                                struct tpm_digest *digest)
 414 {
 415         return -ENODEV;
 416 }
 417
 418 static inline int tpm_pcr_extend(struct tpm_chip *chip, u32 pcr_idx,
 419                                  struct tpm_digest *digests)
 420 {
 421         return -ENODEV;
 422 }
 423
 424 static inline int tpm_send(struct tpm_chip *chip, void *cmd, size_t buflen)
 425 {
 426         return -ENODEV;
 427 }
 428 static inline int tpm_get_random(struct tpm_chip *chip, u8 *data, size_t max)
 429 {
 430         return -ENODEV;
 431 }
 432
 433 static inline struct tpm_chip *tpm_default_chip(void)
 434 {
 435         return NULL;
 436 }
 437 #endif
 438 #endif