lib/tpm-v2.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2018 Bootlin
   4  * Author: Miquel Raynal <[email protected]>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <tpm-common.h>
  10 #include <tpm-v2.h>
  11 #include <linux/bitops.h>
  12 #include "tpm-utils.h"
  13
  14 u32 tpm2_startup(struct udevice *dev, enum tpm2_startup_types mode)
  15 {
  16         const u8 command_v2[12] = {
  17                 tpm_u16(TPM2_ST_NO_SESSIONS),
  18                 tpm_u32(12),
  19                 tpm_u32(TPM2_CC_STARTUP),
  20                 tpm_u16(mode),
  21         };
  22         int ret;
  23
  24         /*
  25          * Note TPM2_Startup command will return RC_SUCCESS the first time,
  26          * but will return RC_INITIALIZE otherwise.
  27          */
  28         ret = tpm_sendrecv_command(dev, command_v2, NULL, NULL);
  29         if (ret && ret != TPM2_RC_INITIALIZE)
  30                 return ret;
  31
  32         return 0;
  33 }
  34
  35 u32 tpm2_self_test(struct udevice *dev, enum tpm2_yes_no full_test)
  36 {
  37         const u8 command_v2[12] = {
  38                 tpm_u16(TPM2_ST_NO_SESSIONS),
  39                 tpm_u32(11),
  40                 tpm_u32(TPM2_CC_SELF_TEST),
  41                 full_test,
  42         };
  43
  44         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
  45 }
  46
  47 u32 tpm2_clear(struct udevice *dev, u32 handle, const char *pw,
  48                const ssize_t pw_sz)
  49 {
  50         u8 command_v2[COMMAND_BUFFER_SIZE] = {
  51                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
  52                 tpm_u32(27 + pw_sz),            /* Length */
  53                 tpm_u32(TPM2_CC_CLEAR),         /* Command code */
  54
  55                 /* HANDLE */
  56                 tpm_u32(handle),                /* TPM resource handle */
  57
  58                 /* AUTH_SESSION */
  59                 tpm_u32(9 + pw_sz),             /* Authorization size */
  60                 tpm_u32(TPM2_RS_PW),            /* Session handle */
  61                 tpm_u16(0),                     /* Size of <nonce> */
  62                                                 /* <nonce> (if any) */
  63                 0,                              /* Attributes: Cont/Excl/Rst */
  64                 tpm_u16(pw_sz),                 /* Size of <hmac/password> */
  65                 /* STRING(pw)                      <hmac/password> (if any) */
  66         };
  67         unsigned int offset = 27;
  68         int ret;
  69
  70         /*
  71          * Fill the command structure starting from the first buffer:
  72          *     - the password (if any)
  73          */
  74         ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
  75                                offset, pw, pw_sz);
  76         offset += pw_sz;
  77         if (ret)
  78                 return TPM_LIB_ERROR;
  79
  80         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
  81 }
  82
  83 u32 tpm2_pcr_extend(struct udevice *dev, u32 index, u32 algorithm,
  84                     const u8 *digest, u32 digest_len)
  85 {
  86         u8 command_v2[COMMAND_BUFFER_SIZE] = {
  87                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
  88                 tpm_u32(33 + digest_len),       /* Length */
  89                 tpm_u32(TPM2_CC_PCR_EXTEND),    /* Command code */
  90
  91                 /* HANDLE */
  92                 tpm_u32(index),                 /* Handle (PCR Index) */
  93
  94                 /* AUTH_SESSION */
  95                 tpm_u32(9),                     /* Authorization size */
  96                 tpm_u32(TPM2_RS_PW),            /* Session handle */
  97                 tpm_u16(0),                     /* Size of <nonce> */
  98                                                 /* <nonce> (if any) */
  99                 0,                              /* Attributes: Cont/Excl/Rst */
 100                 tpm_u16(0),                     /* Size of <hmac/password> */
 101                                                 /* <hmac/password> (if any) */
 102                 tpm_u32(1),                     /* Count (number of hashes) */
 103                 tpm_u16(algorithm),     /* Algorithm of the hash */
 104                 /* STRING(digest)                  Digest */
 105         };
 106         unsigned int offset = 33;
 107         int ret;
 108
 109         /*
 110          * Fill the command structure starting from the first buffer:
 111          *     - the digest
 112          */
 113         ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
 114                                offset, digest, digest_len);
 115         offset += digest_len;
 116         if (ret)
 117                 return TPM_LIB_ERROR;
 118
 119         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 120 }
 121
 122 u32 tpm2_pcr_read(struct udevice *dev, u32 idx, unsigned int idx_min_sz,
 123                   void *data, unsigned int *updates)
 124 {
 125         u8 idx_array_sz = max(idx_min_sz, DIV_ROUND_UP(idx, 8));
 126         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 127                 tpm_u16(TPM2_ST_NO_SESSIONS),   /* TAG */
 128                 tpm_u32(17 + idx_array_sz),     /* Length */
 129                 tpm_u32(TPM2_CC_PCR_READ),      /* Command code */
 130
 131                 /* TPML_PCR_SELECTION */
 132                 tpm_u32(1),                     /* Number of selections */
 133                 tpm_u16(TPM2_ALG_SHA256),       /* Algorithm of the hash */
 134                 idx_array_sz,                   /* Array size for selection */
 135                 /* bitmap(idx)                     Selected PCR bitmap */
 136         };
 137         size_t response_len = COMMAND_BUFFER_SIZE;
 138         u8 response[COMMAND_BUFFER_SIZE];
 139         unsigned int pcr_sel_idx = idx / 8;
 140         u8 pcr_sel_bit = BIT(idx % 8);
 141         unsigned int counter = 0;
 142         int ret;
 143
 144         if (pack_byte_string(command_v2, COMMAND_BUFFER_SIZE, "b",
 145                              17 + pcr_sel_idx, pcr_sel_bit))
 146                 return TPM_LIB_ERROR;
 147
 148         ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
 149         if (ret)
 150                 return ret;
 151
 152         if (unpack_byte_string(response, response_len, "ds",
 153                                10, &counter,
 154                                response_len - TPM2_DIGEST_LEN, data,
 155                                TPM2_DIGEST_LEN))
 156                 return TPM_LIB_ERROR;
 157
 158         if (updates)
 159                 *updates = counter;
 160
 161         return 0;
 162 }
 163
 164 u32 tpm2_get_capability(struct udevice *dev, u32 capability, u32 property,
 165                         void *buf, size_t prop_count)
 166 {
 167         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 168                 tpm_u16(TPM2_ST_NO_SESSIONS),           /* TAG */
 169                 tpm_u32(22),                            /* Length */
 170                 tpm_u32(TPM2_CC_GET_CAPABILITY),        /* Command code */
 171
 172                 tpm_u32(capability),                    /* Capability */
 173                 tpm_u32(property),                      /* Property */
 174                 tpm_u32(prop_count),                    /* Property count */
 175         };
 176         u8 response[COMMAND_BUFFER_SIZE];
 177         size_t response_len = COMMAND_BUFFER_SIZE;
 178         unsigned int properties_off;
 179         int ret;
 180
 181         ret = tpm_sendrecv_command(dev, command_v2, response, &response_len);
 182         if (ret)
 183                 return ret;
 184
 185         /*
 186          * In the response buffer, the properties are located after the:
 187          * tag (u16), response size (u32), response code (u32),
 188          * YES/NO flag (u8), TPM_CAP (u32).
 189          */
 190         properties_off = sizeof(u16) + sizeof(u32) + sizeof(u32) +
 191                          sizeof(u8) + sizeof(u32);
 192         memcpy(buf, &response[properties_off], response_len - properties_off);
 193
 194         return 0;
 195 }
 196
 197 u32 tpm2_dam_reset(struct udevice *dev, const char *pw, const ssize_t pw_sz)
 198 {
 199         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 200                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 201                 tpm_u32(27 + pw_sz),            /* Length */
 202                 tpm_u32(TPM2_CC_DAM_RESET),     /* Command code */
 203
 204                 /* HANDLE */
 205                 tpm_u32(TPM2_RH_LOCKOUT),       /* TPM resource handle */
 206
 207                 /* AUTH_SESSION */
 208                 tpm_u32(9 + pw_sz),             /* Authorization size */
 209                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 210                 tpm_u16(0),                     /* Size of <nonce> */
 211                                                 /* <nonce> (if any) */
 212                 0,                              /* Attributes: Cont/Excl/Rst */
 213                 tpm_u16(pw_sz),                 /* Size of <hmac/password> */
 214                 /* STRING(pw)                      <hmac/password> (if any) */
 215         };
 216         unsigned int offset = 27;
 217         int ret;
 218
 219         /*
 220          * Fill the command structure starting from the first buffer:
 221          *     - the password (if any)
 222          */
 223         ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
 224                                offset, pw, pw_sz);
 225         offset += pw_sz;
 226         if (ret)
 227                 return TPM_LIB_ERROR;
 228
 229         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 230 }
 231
 232 u32 tpm2_dam_parameters(struct udevice *dev, const char *pw,
 233                         const ssize_t pw_sz, unsigned int max_tries,
 234                         unsigned int recovery_time,
 235                         unsigned int lockout_recovery)
 236 {
 237         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 238                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 239                 tpm_u32(27 + pw_sz + 12),       /* Length */
 240                 tpm_u32(TPM2_CC_DAM_PARAMETERS), /* Command code */
 241
 242                 /* HANDLE */
 243                 tpm_u32(TPM2_RH_LOCKOUT),       /* TPM resource handle */
 244
 245                 /* AUTH_SESSION */
 246                 tpm_u32(9 + pw_sz),             /* Authorization size */
 247                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 248                 tpm_u16(0),                     /* Size of <nonce> */
 249                                                 /* <nonce> (if any) */
 250                 0,                              /* Attributes: Cont/Excl/Rst */
 251                 tpm_u16(pw_sz),                 /* Size of <hmac/password> */
 252                 /* STRING(pw)                      <hmac/password> (if any) */
 253
 254                 /* LOCKOUT PARAMETERS */
 255                 /* tpm_u32(max_tries)              Max tries (0, always lock) */
 256                 /* tpm_u32(recovery_time)          Recovery time (0, no lock) */
 257                 /* tpm_u32(lockout_recovery)       Lockout recovery */
 258         };
 259         unsigned int offset = 27;
 260         int ret;
 261
 262         /*
 263          * Fill the command structure starting from the first buffer:
 264          *     - the password (if any)
 265          *     - max tries
 266          *     - recovery time
 267          *     - lockout recovery
 268          */
 269         ret = pack_byte_string(command_v2, sizeof(command_v2), "sddd",
 270                                offset, pw, pw_sz,
 271                                offset + pw_sz, max_tries,
 272                                offset + pw_sz + 4, recovery_time,
 273                                offset + pw_sz + 8, lockout_recovery);
 274         offset += pw_sz + 12;
 275         if (ret)
 276                 return TPM_LIB_ERROR;
 277
 278         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 279 }
 280
 281 int tpm2_change_auth(struct udevice *dev, u32 handle, const char *newpw,
 282                      const ssize_t newpw_sz, const char *oldpw,
 283                      const ssize_t oldpw_sz)
 284 {
 285         unsigned int offset = 27;
 286         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 287                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 288                 tpm_u32(offset + oldpw_sz + 2 + newpw_sz), /* Length */
 289                 tpm_u32(TPM2_CC_HIERCHANGEAUTH), /* Command code */
 290
 291                 /* HANDLE */
 292                 tpm_u32(handle),                /* TPM resource handle */
 293
 294                 /* AUTH_SESSION */
 295                 tpm_u32(9 + oldpw_sz),          /* Authorization size */
 296                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 297                 tpm_u16(0),                     /* Size of <nonce> */
 298                                                 /* <nonce> (if any) */
 299                 0,                              /* Attributes: Cont/Excl/Rst */
 300                 tpm_u16(oldpw_sz)               /* Size of <hmac/password> */
 301                 /* STRING(oldpw)                   <hmac/password> (if any) */
 302
 303                 /* TPM2B_AUTH (TPM2B_DIGEST) */
 304                 /* tpm_u16(newpw_sz)               Digest size, new pw length */
 305                 /* STRING(newpw)                   Digest buffer, new pw */
 306         };
 307         int ret;
 308
 309         /*
 310          * Fill the command structure starting from the first buffer:
 311          *     - the old password (if any)
 312          *     - size of the new password
 313          *     - new password
 314          */
 315         ret = pack_byte_string(command_v2, sizeof(command_v2), "sws",
 316                                offset, oldpw, oldpw_sz,
 317                                offset + oldpw_sz, newpw_sz,
 318                                offset + oldpw_sz + 2, newpw, newpw_sz);
 319         offset += oldpw_sz + 2 + newpw_sz;
 320         if (ret)
 321                 return TPM_LIB_ERROR;
 322
 323         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 324 }
 325
 326 u32 tpm2_pcr_setauthpolicy(struct udevice *dev, const char *pw,
 327                            const ssize_t pw_sz, u32 index, const char *key)
 328 {
 329         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 330                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 331                 tpm_u32(35 + pw_sz + TPM2_DIGEST_LEN), /* Length */
 332                 tpm_u32(TPM2_CC_PCR_SETAUTHPOL), /* Command code */
 333
 334                 /* HANDLE */
 335                 tpm_u32(TPM2_RH_PLATFORM),      /* TPM resource handle */
 336
 337                 /* AUTH_SESSION */
 338                 tpm_u32(9 + pw_sz),             /* Authorization size */
 339                 tpm_u32(TPM2_RS_PW),            /* session handle */
 340                 tpm_u16(0),                     /* Size of <nonce> */
 341                                                 /* <nonce> (if any) */
 342                 0,                              /* Attributes: Cont/Excl/Rst */
 343                 tpm_u16(pw_sz)                  /* Size of <hmac/password> */
 344                 /* STRING(pw)                      <hmac/password> (if any) */
 345
 346                 /* TPM2B_AUTH (TPM2B_DIGEST) */
 347                 /* tpm_u16(TPM2_DIGEST_LEN)        Digest size length */
 348                 /* STRING(key)                     Digest buffer (PCR key) */
 349
 350                 /* TPMI_ALG_HASH */
 351                 /* tpm_u16(TPM2_ALG_SHA256)   Algorithm of the hash */
 352
 353                 /* TPMI_DH_PCR */
 354                 /* tpm_u32(index),                 PCR Index */
 355         };
 356         unsigned int offset = 27;
 357         int ret;
 358
 359         /*
 360          * Fill the command structure starting from the first buffer:
 361          *     - the password (if any)
 362          *     - the PCR key length
 363          *     - the PCR key
 364          *     - the hash algorithm
 365          *     - the PCR index
 366          */
 367         ret = pack_byte_string(command_v2, sizeof(command_v2), "swswd",
 368                                offset, pw, pw_sz,
 369                                offset + pw_sz, TPM2_DIGEST_LEN,
 370                                offset + pw_sz + 2, key, TPM2_DIGEST_LEN,
 371                                offset + pw_sz + 2 + TPM2_DIGEST_LEN,
 372                                TPM2_ALG_SHA256,
 373                                offset + pw_sz + 4 + TPM2_DIGEST_LEN, index);
 374         offset += pw_sz + 2 + TPM2_DIGEST_LEN + 2 + 4;
 375         if (ret)
 376                 return TPM_LIB_ERROR;
 377
 378         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 379 }
 380
 381 u32 tpm2_pcr_setauthvalue(struct udevice *dev, const char *pw,
 382                           const ssize_t pw_sz, u32 index, const char *key,
 383                           const ssize_t key_sz)
 384 {
 385         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 386                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 387                 tpm_u32(33 + pw_sz + TPM2_DIGEST_LEN), /* Length */
 388                 tpm_u32(TPM2_CC_PCR_SETAUTHVAL), /* Command code */
 389
 390                 /* HANDLE */
 391                 tpm_u32(index),                 /* Handle (PCR Index) */
 392
 393                 /* AUTH_SESSION */
 394                 tpm_u32(9 + pw_sz),             /* Authorization size */
 395                 tpm_u32(TPM2_RS_PW),            /* session handle */
 396                 tpm_u16(0),                     /* Size of <nonce> */
 397                                                 /* <nonce> (if any) */
 398                 0,                              /* Attributes: Cont/Excl/Rst */
 399                 tpm_u16(pw_sz),                 /* Size of <hmac/password> */
 400                 /* STRING(pw)                      <hmac/password> (if any) */
 401
 402                 /* TPM2B_DIGEST */
 403                 /* tpm_u16(key_sz)                 Key length */
 404                 /* STRING(key)                     Key */
 405         };
 406         unsigned int offset = 27;
 407         int ret;
 408
 409         /*
 410          * Fill the command structure starting from the first buffer:
 411          *     - the password (if any)
 412          *     - the number of digests, 1 in our case
 413          *     - the algorithm, sha256 in our case
 414          *     - the digest (64 bytes)
 415          */
 416         ret = pack_byte_string(command_v2, sizeof(command_v2), "sws",
 417                                offset, pw, pw_sz,
 418                                offset + pw_sz, key_sz,
 419                                offset + pw_sz + 2, key, key_sz);
 420         offset += pw_sz + 2 + key_sz;
 421         if (ret)
 422                 return TPM_LIB_ERROR;
 423
 424         return tpm_sendrecv_command(dev, command_v2, NULL, NULL);
 425 }
 426
 427 u32 tpm2_get_random(struct udevice *dev, void *data, u32 count)
 428 {
 429         const u8 command_v2[10] = {
 430                 tpm_u16(TPM2_ST_NO_SESSIONS),
 431                 tpm_u32(12),
 432                 tpm_u32(TPM2_CC_GET_RANDOM),
 433         };
 434         u8 buf[COMMAND_BUFFER_SIZE], response[COMMAND_BUFFER_SIZE];
 435
 436         const size_t data_size_offset = 10;
 437         const size_t data_offset = 12;
 438         size_t response_length = sizeof(response);
 439         u32 data_size;
 440         u8 *out = data;
 441
 442         while (count > 0) {
 443                 u32 this_bytes = min((size_t)count,
 444                                      sizeof(response) - data_offset);
 445                 u32 err;
 446
 447                 if (pack_byte_string(buf, sizeof(buf), "sw",
 448                                      0, command_v2, sizeof(command_v2),
 449                                      sizeof(command_v2), this_bytes))
 450                         return TPM_LIB_ERROR;
 451                 err = tpm_sendrecv_command(dev, buf, response,
 452                                            &response_length);
 453                 if (err)
 454                         return err;
 455                 if (unpack_byte_string(response, response_length, "w",
 456                                        data_size_offset, &data_size))
 457                         return TPM_LIB_ERROR;
 458                 if (data_size > this_bytes)
 459                         return TPM_LIB_ERROR;
 460                 if (unpack_byte_string(response, response_length, "s",
 461                                        data_offset, out, data_size))
 462                         return TPM_LIB_ERROR;
 463
 464                 count -= data_size;
 465                 out += data_size;
 466         }
 467
 468         return 0;
 469 }