lib/tpm-v2.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2018 Bootlin
   4  * Author: Miquel Raynal <miquel.raynal@bootlin.com>
   5  */
   6
   7 #include <common.h>
   8 #include <dm.h>
   9 #include <tpm-common.h>
  10 #include <tpm-v2.h>
  11 #include "tpm-utils.h"
  12
  13 u32 tpm2_startup(enum tpm2_startup_types mode)
  14 {
  15         const u8 command_v2[12] = {
  16                 tpm_u16(TPM2_ST_NO_SESSIONS),
  17                 tpm_u32(12),
  18                 tpm_u32(TPM2_CC_STARTUP),
  19                 tpm_u16(mode),
  20         };
  21         int ret;
  22
  23         /*
  24          * Note TPM2_Startup command will return RC_SUCCESS the first time,
  25          * but will return RC_INITIALIZE otherwise.
  26          */
  27         ret = tpm_sendrecv_command(command_v2, NULL, NULL);
  28         if (ret && ret != TPM2_RC_INITIALIZE)
  29                 return ret;
  30
  31         return 0;
  32 }
  33
  34 u32 tpm2_self_test(enum tpm2_yes_no full_test)
  35 {
  36         const u8 command_v2[12] = {
  37                 tpm_u16(TPM2_ST_NO_SESSIONS),
  38                 tpm_u32(11),
  39                 tpm_u32(TPM2_CC_SELF_TEST),
  40                 full_test,
  41         };
  42
  43         return tpm_sendrecv_command(command_v2, NULL, NULL);
  44 }
  45
  46 u32 tpm2_clear(u32 handle, const char *pw, const ssize_t pw_sz)
  47 {
  48         u8 command_v2[COMMAND_BUFFER_SIZE] = {
  49                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
  50                 tpm_u32(27 + pw_sz),            /* Length */
  51                 tpm_u32(TPM2_CC_CLEAR),         /* Command code */
  52
  53                 /* HANDLE */
  54                 tpm_u32(handle),                /* TPM resource handle */
  55
  56                 /* AUTH_SESSION */
  57                 tpm_u32(9 + pw_sz),             /* Authorization size */
  58                 tpm_u32(TPM2_RS_PW),            /* Session handle */
  59                 tpm_u16(0),                     /* Size of <nonce> */
  60                                                 /* <nonce> (if any) */
  61                 0,                              /* Attributes: Cont/Excl/Rst */
  62                 tpm_u16(pw_sz),                 /* Size of <hmac/password> */
  63                 /* STRING(pw)                      <hmac/password> (if any) */
  64         };
  65         unsigned int offset = 27;
  66         int ret;
  67
  68         /*
  69          * Fill the command structure starting from the first buffer:
  70          *     - the password (if any)
  71          */
  72         ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
  73                                offset, pw, pw_sz);
  74         offset += pw_sz;
  75         if (ret)
  76                 return TPM_LIB_ERROR;
  77
  78         return tpm_sendrecv_command(command_v2, NULL, NULL);
  79 }
  80
  81 u32 tpm2_pcr_extend(u32 index, const uint8_t *digest)
  82 {
  83         u8 command_v2[COMMAND_BUFFER_SIZE] = {
  84                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
  85                 tpm_u32(33 + TPM2_DIGEST_LEN),  /* Length */
  86                 tpm_u32(TPM2_CC_PCR_EXTEND),    /* Command code */
  87
  88                 /* HANDLE */
  89                 tpm_u32(index),                 /* Handle (PCR Index) */
  90
  91                 /* AUTH_SESSION */
  92                 tpm_u32(9),                     /* Authorization size */
  93                 tpm_u32(TPM2_RS_PW),            /* Session handle */
  94                 tpm_u16(0),                     /* Size of <nonce> */
  95                                                 /* <nonce> (if any) */
  96                 0,                              /* Attributes: Cont/Excl/Rst */
  97                 tpm_u16(0),                     /* Size of <hmac/password> */
  98                                                 /* <hmac/password> (if any) */
  99                 tpm_u32(1),                     /* Count (number of hashes) */
 100                 tpm_u16(TPM2_ALG_SHA256),       /* Algorithm of the hash */
 101                 /* STRING(digest)                  Digest */
 102         };
 103         unsigned int offset = 33;
 104         int ret;
 105
 106         /*
 107          * Fill the command structure starting from the first buffer:
 108          *     - the digest
 109          */
 110         ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
 111                                offset, digest, TPM2_DIGEST_LEN);
 112         offset += TPM2_DIGEST_LEN;
 113         if (ret)
 114                 return TPM_LIB_ERROR;
 115
 116         return tpm_sendrecv_command(command_v2, NULL, NULL);
 117 }
 118
 119 u32 tpm2_pcr_read(u32 idx, unsigned int idx_min_sz, void *data,
 120                   unsigned int *updates)
 121 {
 122         u8 idx_array_sz = max(idx_min_sz, DIV_ROUND_UP(idx, 8));
 123         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 124                 tpm_u16(TPM2_ST_NO_SESSIONS),   /* TAG */
 125                 tpm_u32(17 + idx_array_sz),     /* Length */
 126                 tpm_u32(TPM2_CC_PCR_READ),      /* Command code */
 127
 128                 /* TPML_PCR_SELECTION */
 129                 tpm_u32(1),                     /* Number of selections */
 130                 tpm_u16(TPM2_ALG_SHA256),       /* Algorithm of the hash */
 131                 idx_array_sz,                   /* Array size for selection */
 132                 /* bitmap(idx)                     Selected PCR bitmap */
 133         };
 134         size_t response_len = COMMAND_BUFFER_SIZE;
 135         u8 response[COMMAND_BUFFER_SIZE];
 136         unsigned int pcr_sel_idx = idx / 8;
 137         u8 pcr_sel_bit = BIT(idx % 8);
 138         unsigned int counter = 0;
 139         int ret;
 140
 141         if (pack_byte_string(command_v2, COMMAND_BUFFER_SIZE, "b",
 142                              17 + pcr_sel_idx, pcr_sel_bit))
 143                 return TPM_LIB_ERROR;
 144
 145         ret = tpm_sendrecv_command(command_v2, response, &response_len);
 146         if (ret)
 147                 return ret;
 148
 149         if (unpack_byte_string(response, response_len, "ds",
 150                                10, &counter,
 151                                response_len - TPM2_DIGEST_LEN, data,
 152                                TPM2_DIGEST_LEN))
 153                 return TPM_LIB_ERROR;
 154
 155         if (updates)
 156                 *updates = counter;
 157
 158         return 0;
 159 }
 160
 161 u32 tpm2_get_capability(u32 capability, u32 property, void *buf,
 162                         size_t prop_count)
 163 {
 164         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 165                 tpm_u16(TPM2_ST_NO_SESSIONS),           /* TAG */
 166                 tpm_u32(22),                            /* Length */
 167                 tpm_u32(TPM2_CC_GET_CAPABILITY),        /* Command code */
 168
 169                 tpm_u32(capability),                    /* Capability */
 170                 tpm_u32(property),                      /* Property */
 171                 tpm_u32(prop_count),                    /* Property count */
 172         };
 173         u8 response[COMMAND_BUFFER_SIZE];
 174         size_t response_len = COMMAND_BUFFER_SIZE;
 175         unsigned int properties_off;
 176         int ret;
 177
 178         ret = tpm_sendrecv_command(command_v2, response, &response_len);
 179         if (ret)
 180                 return ret;
 181
 182         /*
 183          * In the response buffer, the properties are located after the:
 184          * tag (u16), response size (u32), response code (u32),
 185          * YES/NO flag (u8), TPM_CAP (u32) and TPMU_CAPABILITIES (u32).
 186          */
 187         properties_off = sizeof(u16) + sizeof(u32) + sizeof(u32) +
 188                          sizeof(u8) + sizeof(u32) + sizeof(u32);
 189         memcpy(buf, &response[properties_off], response_len - properties_off);
 190
 191         return 0;
 192 }
 193
 194 u32 tpm2_dam_reset(const char *pw, const ssize_t pw_sz)
 195 {
 196         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 197                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 198                 tpm_u32(27 + pw_sz),            /* Length */
 199                 tpm_u32(TPM2_CC_DAM_RESET),     /* Command code */
 200
 201                 /* HANDLE */
 202                 tpm_u32(TPM2_RH_LOCKOUT),       /* TPM resource handle */
 203
 204                 /* AUTH_SESSION */
 205                 tpm_u32(9 + pw_sz),             /* Authorization size */
 206                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 207                 tpm_u16(0),                     /* Size of <nonce> */
 208                                                 /* <nonce> (if any) */
 209                 0,                              /* Attributes: Cont/Excl/Rst */
 210                 tpm_u16(pw_sz),                 /* Size of <hmac/password> */
 211                 /* STRING(pw)                      <hmac/password> (if any) */
 212         };
 213         unsigned int offset = 27;
 214         int ret;
 215
 216         /*
 217          * Fill the command structure starting from the first buffer:
 218          *     - the password (if any)
 219          */
 220         ret = pack_byte_string(command_v2, sizeof(command_v2), "s",
 221                                offset, pw, pw_sz);
 222         offset += pw_sz;
 223         if (ret)
 224                 return TPM_LIB_ERROR;
 225
 226         return tpm_sendrecv_command(command_v2, NULL, NULL);
 227 }
 228
 229 u32 tpm2_dam_parameters(const char *pw, const ssize_t pw_sz,
 230                         unsigned int max_tries, unsigned int recovery_time,
 231                         unsigned int lockout_recovery)
 232 {
 233         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 234                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 235                 tpm_u32(27 + pw_sz + 12),       /* Length */
 236                 tpm_u32(TPM2_CC_DAM_PARAMETERS), /* Command code */
 237
 238                 /* HANDLE */
 239                 tpm_u32(TPM2_RH_LOCKOUT),       /* TPM resource handle */
 240
 241                 /* AUTH_SESSION */
 242                 tpm_u32(9 + pw_sz),             /* Authorization size */
 243                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 244                 tpm_u16(0),                     /* Size of <nonce> */
 245                                                 /* <nonce> (if any) */
 246                 0,                              /* Attributes: Cont/Excl/Rst */
 247                 tpm_u16(pw_sz),                 /* Size of <hmac/password> */
 248                 /* STRING(pw)                      <hmac/password> (if any) */
 249
 250                 /* LOCKOUT PARAMETERS */
 251                 /* tpm_u32(max_tries)              Max tries (0, always lock) */
 252                 /* tpm_u32(recovery_time)          Recovery time (0, no lock) */
 253                 /* tpm_u32(lockout_recovery)       Lockout recovery */
 254         };
 255         unsigned int offset = 27;
 256         int ret;
 257
 258         /*
 259          * Fill the command structure starting from the first buffer:
 260          *     - the password (if any)
 261          *     - max tries
 262          *     - recovery time
 263          *     - lockout recovery
 264          */
 265         ret = pack_byte_string(command_v2, sizeof(command_v2), "sddd",
 266                                offset, pw, pw_sz,
 267                                offset + pw_sz, max_tries,
 268                                offset + pw_sz + 4, recovery_time,
 269                                offset + pw_sz + 8, lockout_recovery);
 270         offset += pw_sz + 12;
 271         if (ret)
 272                 return TPM_LIB_ERROR;
 273
 274         return tpm_sendrecv_command(command_v2, NULL, NULL);
 275 }
 276
 277 int tpm2_change_auth(u32 handle, const char *newpw, const ssize_t newpw_sz,
 278                      const char *oldpw, const ssize_t oldpw_sz)
 279 {
 280         unsigned int offset = 27;
 281         u8 command_v2[COMMAND_BUFFER_SIZE] = {
 282                 tpm_u16(TPM2_ST_SESSIONS),      /* TAG */
 283                 tpm_u32(offset + oldpw_sz + 2 + newpw_sz), /* Length */
 284                 tpm_u32(TPM2_CC_HIERCHANGEAUTH), /* Command code */
 285
 286                 /* HANDLE */
 287                 tpm_u32(handle),                /* TPM resource handle */
 288
 289                 /* AUTH_SESSION */
 290                 tpm_u32(9 + oldpw_sz),          /* Authorization size */
 291                 tpm_u32(TPM2_RS_PW),            /* Session handle */
 292                 tpm_u16(0),                     /* Size of <nonce> */
 293                                                 /* <nonce> (if any) */
 294                 0,                              /* Attributes: Cont/Excl/Rst */
 295                 tpm_u16(oldpw_sz)               /* Size of <hmac/password> */
 296                 /* STRING(oldpw)                   <hmac/password> (if any) */
 297
 298                 /* TPM2B_AUTH (TPM2B_DIGEST) */
 299                 /* tpm_u16(newpw_sz)               Digest size, new pw length */
 300                 /* STRING(newpw)                   Digest buffer, new pw */
 301         };
 302         int ret;
 303
 304         /*
 305          * Fill the command structure starting from the first buffer:
 306          *     - the old password (if any)
 307          *     - size of the new password
 308          *     - new password
 309          */
 310         ret = pack_byte_string(command_v2, sizeof(command_v2), "sws",
 311                                offset, oldpw, oldpw_sz,
 312                                offset + oldpw_sz, newpw_sz,
 313                                offset + oldpw_sz + 2, newpw, newpw_sz);
 314         offset += oldpw_sz + 2 + newpw_sz;
 315         if (ret)
 316                 return TPM_LIB_ERROR;
 317
 318         return tpm_sendrecv_command(command_v2, NULL, NULL);
 319 }