lib/uuid.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright 2011 Calxeda, Inc.
   4  */
   5
   6 #include <common.h>
   7 #include <command.h>
   8 #include <efi_api.h>
   9 #include <env.h>
  10 #include <rand.h>
  11 #include <time.h>
  12 #include <uuid.h>
  13 #include <linux/ctype.h>
  14 #include <errno.h>
  15 #include <common.h>
  16 #include <asm/io.h>
  17 #include <part_efi.h>
  18 #include <malloc.h>
  19 #include <dm/uclass.h>
  20 #include <rng.h>
  21
  22 /*
  23  * UUID - Universally Unique IDentifier - 128 bits unique number.
  24  *        There are 5 versions and one variant of UUID defined by RFC4122
  25  *        specification. A UUID contains a set of fields. The set varies
  26  *        depending on the version of the UUID, as shown below:
  27  *        - time, MAC address(v1),
  28  *        - user ID(v2),
  29  *        - MD5 of name or URL(v3),
  30  *        - random data(v4),
  31  *        - SHA-1 of name or URL(v5),
  32  *
  33  * Layout of UUID:
  34  * timestamp - 60-bit: time_low, time_mid, time_hi_and_version
  35  * version   - 4 bit (bit 4 through 7 of the time_hi_and_version)
  36  * clock seq - 14 bit: clock_seq_hi_and_reserved, clock_seq_low
  37  * variant:  - bit 6 and 7 of clock_seq_hi_and_reserved
  38  * node      - 48 bit
  39  *
  40  * source: https://www.ietf.org/rfc/rfc4122.txt
  41  *
  42  * UUID binary format (16 bytes):
  43  *
  44  * 4B-2B-2B-2B-6B (big endian - network byte order)
  45  *
  46  * UUID string is 36 length of characters (36 bytes):
  47  *
  48  * 0        9    14   19   24
  49  * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
  50  *    be     be   be   be       be
  51  *
  52  * where x is a hexadecimal character. Fields are separated by '-'s.
  53  * When converting to a binary UUID, le means the field should be converted
  54  * to little endian and be means it should be converted to big endian.
  55  *
  56  * UUID is also used as GUID (Globally Unique Identifier) with the same binary
  57  * format but it differs in string format like below.
  58  *
  59  * GUID:
  60  * 0        9    14   19   24
  61  * xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
  62  *    le     le   le   be       be
  63  *
  64  * GUID is used e.g. in GPT (GUID Partition Table) as a partiions unique id.
  65  */
  66 int uuid_str_valid(const char *uuid)
  67 {
  68         int i, valid;
  69
  70         if (uuid == NULL)
  71                 return 0;
  72
  73         for (i = 0, valid = 1; uuid[i] && valid; i++) {
  74                 switch (i) {
  75                 case 8: case 13: case 18: case 23:
  76                         valid = (uuid[i] == '-');
  77                         break;
  78                 default:
  79                         valid = isxdigit(uuid[i]);
  80                         break;
  81                 }
  82         }
  83
  84         if (i != UUID_STR_LEN || !valid)
  85                 return 0;
  86
  87         return 1;
  88 }
  89
  90 static const struct {
  91         const char *string;
  92         efi_guid_t guid;
  93 } list_guid[] = {
  94 #ifdef CONFIG_PARTITION_TYPE_GUID
  95         {"system",      PARTITION_SYSTEM_GUID},
  96         {"mbr",         LEGACY_MBR_PARTITION_GUID},
  97         {"msft",        PARTITION_MSFT_RESERVED_GUID},
  98         {"data",        PARTITION_BASIC_DATA_GUID},
  99         {"linux",       PARTITION_LINUX_FILE_SYSTEM_DATA_GUID},
 100         {"raid",        PARTITION_LINUX_RAID_GUID},
 101         {"swap",        PARTITION_LINUX_SWAP_GUID},
 102         {"lvm",         PARTITION_LINUX_LVM_GUID},
 103         {"u-boot-env",  PARTITION_U_BOOT_ENVIRONMENT},
 104 #endif
 105 #if defined(CONFIG_CMD_EFIDEBUG) || defined(CONFIG_EFI)
 106         {
 107                 "Device Path",
 108                 EFI_DEVICE_PATH_PROTOCOL_GUID,
 109         },
 110         {
 111                 "Device Path To Text",
 112                 EFI_DEVICE_PATH_TO_TEXT_PROTOCOL_GUID,
 113         },
 114         {
 115                 "Device Path Utilities",
 116                 EFI_DEVICE_PATH_UTILITIES_PROTOCOL_GUID,
 117         },
 118         {
 119                 "Unicode Collation 2",
 120                 EFI_UNICODE_COLLATION_PROTOCOL2_GUID,
 121         },
 122         {
 123                 "Driver Binding",
 124                 EFI_DRIVER_BINDING_PROTOCOL_GUID,
 125         },
 126         {
 127                 "Simple Text Input",
 128                 EFI_SIMPLE_TEXT_INPUT_PROTOCOL_GUID,
 129         },
 130         {
 131                 "Simple Text Input Ex",
 132                 EFI_SIMPLE_TEXT_INPUT_EX_PROTOCOL_GUID,
 133         },
 134         {
 135                 "Simple Text Output",
 136                 EFI_SIMPLE_TEXT_OUTPUT_PROTOCOL_GUID,
 137         },
 138         {
 139                 "Block IO",
 140                 EFI_BLOCK_IO_PROTOCOL_GUID,
 141         },
 142         {
 143                 "Simple File System",
 144                 EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_GUID,
 145         },
 146         {
 147                 "Loaded Image",
 148                 EFI_LOADED_IMAGE_PROTOCOL_GUID,
 149         },
 150         {
 151                 "Graphics Output",
 152                 EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID,
 153         },
 154         {
 155                 "HII String",
 156                 EFI_HII_STRING_PROTOCOL_GUID,
 157         },
 158         {
 159                 "HII Database",
 160                 EFI_HII_DATABASE_PROTOCOL_GUID,
 161         },
 162         {
 163                 "HII Config Routing",
 164                 EFI_HII_CONFIG_ROUTING_PROTOCOL_GUID,
 165         },
 166         {
 167                 "Load File2",
 168                 EFI_LOAD_FILE2_PROTOCOL_GUID,
 169         },
 170         {
 171                 "Random Number Generator",
 172                 EFI_RNG_PROTOCOL_GUID,
 173         },
 174         {
 175                 "Simple Network",
 176                 EFI_SIMPLE_NETWORK_PROTOCOL_GUID,
 177         },
 178         {
 179                 "PXE Base Code",
 180                 EFI_PXE_BASE_CODE_PROTOCOL_GUID,
 181         },
 182         {
 183                 "Device-Tree Fixup",
 184                 EFI_DT_FIXUP_PROTOCOL_GUID,
 185         },
 186         {
 187                 "TCG2",
 188                 EFI_TCG2_PROTOCOL_GUID,
 189                 },
 190         {
 191                 "System Partition",
 192                 PARTITION_SYSTEM_GUID
 193         },
 194         {
 195                 "Firmware Management",
 196                 EFI_FIRMWARE_MANAGEMENT_PROTOCOL_GUID
 197         },
 198         /* Configuration table GUIDs */
 199         {
 200                 "ACPI table",
 201                 EFI_ACPI_TABLE_GUID,
 202         },
 203         {
 204                 "EFI System Resource Table",
 205                 EFI_SYSTEM_RESOURCE_TABLE_GUID,
 206         },
 207         {
 208                 "device tree",
 209                 EFI_FDT_GUID,
 210         },
 211         {
 212                 "SMBIOS table",
 213                 SMBIOS_TABLE_GUID,
 214         },
 215         {
 216                 "Runtime properties",
 217                 EFI_RT_PROPERTIES_TABLE_GUID,
 218         },
 219         {
 220                 "TCG2 Final Events Table",
 221                 EFI_TCG2_FINAL_EVENTS_TABLE_GUID,
 222         },
 223         {
 224                 "EFI Conformance Profiles Table",
 225                 EFI_CONFORMANCE_PROFILES_TABLE_GUID,
 226         },
 227 #ifdef CONFIG_EFI_RISCV_BOOT_PROTOCOL
 228         {
 229                 "RISC-V Boot",
 230                 RISCV_EFI_BOOT_PROTOCOL_GUID,
 231         },
 232 #endif
 233 #endif /* CONFIG_CMD_EFIDEBUG */
 234 #ifdef CONFIG_CMD_NVEDIT_EFI
 235         /* signature database */
 236         {
 237                 "EFI_GLOBAL_VARIABLE_GUID",
 238                 EFI_GLOBAL_VARIABLE_GUID,
 239         },
 240         {
 241                 "EFI_IMAGE_SECURITY_DATABASE_GUID",
 242                 EFI_IMAGE_SECURITY_DATABASE_GUID,
 243         },
 244         /* certificate types */
 245         {
 246                 "EFI_CERT_SHA256_GUID",
 247                 EFI_CERT_SHA256_GUID,
 248         },
 249         {
 250                 "EFI_CERT_X509_GUID",
 251                 EFI_CERT_X509_GUID,
 252         },
 253         {
 254                 "EFI_CERT_TYPE_PKCS7_GUID",
 255                 EFI_CERT_TYPE_PKCS7_GUID,
 256         },
 257 #endif
 258 #ifdef CONFIG_EFI
 259         { "EFI_LZMA_COMPRESSED", EFI_LZMA_COMPRESSED },
 260         { "EFI_DXE_SERVICES", EFI_DXE_SERVICES },
 261         { "EFI_HOB_LIST", EFI_HOB_LIST },
 262         { "EFI_MEMORY_TYPE", EFI_MEMORY_TYPE },
 263         { "EFI_MEM_STATUS_CODE_REC", EFI_MEM_STATUS_CODE_REC },
 264         { "EFI_GUID_EFI_ACPI1", EFI_GUID_EFI_ACPI1 },
 265 #endif
 266 };
 267
 268 /*
 269  * uuid_guid_get_bin() - this function get GUID bin for string
 270  *
 271  * @param guid_str - pointer to partition type string
 272  * @param guid_bin - pointer to allocated array for big endian output [16B]
 273  */
 274 int uuid_guid_get_bin(const char *guid_str, unsigned char *guid_bin)
 275 {
 276         int i;
 277
 278         for (i = 0; i < ARRAY_SIZE(list_guid); i++) {
 279                 if (!strcmp(list_guid[i].string, guid_str)) {
 280                         memcpy(guid_bin, &list_guid[i].guid, 16);
 281                         return 0;
 282                 }
 283         }
 284         return -ENODEV;
 285 }
 286
 287 /*
 288  * uuid_guid_get_str() - this function get string for GUID.
 289  *
 290  * @param guid_bin - pointer to string with partition type guid [16B]
 291  *
 292  * Returns NULL if the type GUID is not known.
 293  */
 294 const char *uuid_guid_get_str(const unsigned char *guid_bin)
 295 {
 296         int i;
 297
 298         for (i = 0; i < ARRAY_SIZE(list_guid); i++) {
 299                 if (!memcmp(list_guid[i].guid.b, guid_bin, 16)) {
 300                         return list_guid[i].string;
 301                 }
 302         }
 303         return NULL;
 304 }
 305
 306 /*
 307  * uuid_str_to_bin() - convert string UUID or GUID to big endian binary data.
 308  *
 309  * @param uuid_str - pointer to UUID or GUID string [37B] or GUID shorcut
 310  * @param uuid_bin - pointer to allocated array for big endian output [16B]
 311  * @str_format     - UUID string format: 0 - UUID; 1 - GUID
 312  */
 313 int uuid_str_to_bin(const char *uuid_str, unsigned char *uuid_bin,
 314                     int str_format)
 315 {
 316         uint16_t tmp16;
 317         uint32_t tmp32;
 318         uint64_t tmp64;
 319
 320         if (!uuid_str_valid(uuid_str)) {
 321 #ifdef CONFIG_PARTITION_TYPE_GUID
 322                 if (!uuid_guid_get_bin(uuid_str, uuid_bin))
 323                         return 0;
 324 #endif
 325                 return -EINVAL;
 326         }
 327
 328         if (str_format == UUID_STR_FORMAT_STD) {
 329                 tmp32 = cpu_to_be32(hextoul(uuid_str, NULL));
 330                 memcpy(uuid_bin, &tmp32, 4);
 331
 332                 tmp16 = cpu_to_be16(hextoul(uuid_str + 9, NULL));
 333                 memcpy(uuid_bin + 4, &tmp16, 2);
 334
 335                 tmp16 = cpu_to_be16(hextoul(uuid_str + 14, NULL));
 336                 memcpy(uuid_bin + 6, &tmp16, 2);
 337         } else {
 338                 tmp32 = cpu_to_le32(hextoul(uuid_str, NULL));
 339                 memcpy(uuid_bin, &tmp32, 4);
 340
 341                 tmp16 = cpu_to_le16(hextoul(uuid_str + 9, NULL));
 342                 memcpy(uuid_bin + 4, &tmp16, 2);
 343
 344                 tmp16 = cpu_to_le16(hextoul(uuid_str + 14, NULL));
 345                 memcpy(uuid_bin + 6, &tmp16, 2);
 346         }
 347
 348         tmp16 = cpu_to_be16(hextoul(uuid_str + 19, NULL));
 349         memcpy(uuid_bin + 8, &tmp16, 2);
 350
 351         tmp64 = cpu_to_be64(simple_strtoull(uuid_str + 24, NULL, 16));
 352         memcpy(uuid_bin + 10, (char *)&tmp64 + 2, 6);
 353
 354         return 0;
 355 }
 356
 357 /*
 358  * uuid_bin_to_str() - convert big endian binary data to string UUID or GUID.
 359  *
 360  * @param uuid_bin:     pointer to binary data of UUID (big endian) [16B]
 361  * @param uuid_str:     pointer to allocated array for output string [37B]
 362  * @str_format:         bit 0: 0 - UUID; 1 - GUID
 363  *                      bit 1: 0 - lower case; 2 - upper case
 364  */
 365 void uuid_bin_to_str(const unsigned char *uuid_bin, char *uuid_str,
 366                      int str_format)
 367 {
 368         const u8 uuid_char_order[UUID_BIN_LEN] = {0, 1, 2, 3, 4, 5, 6, 7, 8,
 369                                                   9, 10, 11, 12, 13, 14, 15};
 370         const u8 guid_char_order[UUID_BIN_LEN] = {3, 2, 1, 0, 5, 4, 7, 6, 8,
 371                                                   9, 10, 11, 12, 13, 14, 15};
 372         const u8 *char_order;
 373         const char *format;
 374         int i;
 375
 376         /*
 377          * UUID and GUID bin data - always in big endian:
 378          * 4B-2B-2B-2B-6B
 379          * be be be be be
 380          */
 381         if (str_format & UUID_STR_FORMAT_GUID)
 382                 char_order = guid_char_order;
 383         else
 384                 char_order = uuid_char_order;
 385         if (str_format & UUID_STR_UPPER_CASE)
 386                 format = "%02X";
 387         else
 388                 format = "%02x";
 389
 390         for (i = 0; i < 16; i++) {
 391                 sprintf(uuid_str, format, uuid_bin[char_order[i]]);
 392                 uuid_str += 2;
 393                 switch (i) {
 394                 case 3:
 395                 case 5:
 396                 case 7:
 397                 case 9:
 398                         *uuid_str++ = '-';
 399                         break;
 400                 }
 401         }
 402 }
 403
 404 /*
 405  * gen_rand_uuid() - this function generates a random binary UUID version 4.
 406  *                   In this version all fields beside 4 bits of version and
 407  *                   2 bits of variant are randomly generated.
 408  *
 409  * @param uuid_bin - pointer to allocated array [16B]. Output is in big endian.
 410 */
 411 #if defined(CONFIG_RANDOM_UUID) || defined(CONFIG_CMD_UUID)
 412 void gen_rand_uuid(unsigned char *uuid_bin)
 413 {
 414         u32 ptr[4];
 415         struct uuid *uuid = (struct uuid *)ptr;
 416         int i, ret;
 417         struct udevice *devp;
 418         u32 randv = 0;
 419
 420         if (IS_ENABLED(CONFIG_DM_RNG)) {
 421                 ret = uclass_get_device(UCLASS_RNG, 0, &devp);
 422                 if (!ret) {
 423                         ret = dm_rng_read(devp, &randv, sizeof(randv));
 424                         if (ret < 0)
 425                                 randv = 0;
 426                 }
 427         }
 428         if (randv)
 429                 srand(randv);
 430         else
 431                 srand(get_ticks() + rand());
 432
 433         /* Set all fields randomly */
 434         for (i = 0; i < 4; i++)
 435                 ptr[i] = rand();
 436
 437         clrsetbits_be16(&uuid->time_hi_and_version,
 438                         UUID_VERSION_MASK,
 439                         UUID_VERSION << UUID_VERSION_SHIFT);
 440
 441         clrsetbits_8(&uuid->clock_seq_hi_and_reserved,
 442                      UUID_VARIANT_MASK,
 443                      UUID_VARIANT << UUID_VARIANT_SHIFT);
 444
 445         memcpy(uuid_bin, uuid, 16);
 446 }
 447
 448 /*
 449  * gen_rand_uuid_str() - this function generates UUID v4 (random) in two string
 450  *                       formats UUID or GUID.
 451  *
 452  * @param uuid_str - pointer to allocated array [37B].
 453  * @param          - uuid output type: UUID - 0, GUID - 1
 454  */
 455 void gen_rand_uuid_str(char *uuid_str, int str_format)
 456 {
 457         unsigned char uuid_bin[UUID_BIN_LEN];
 458
 459         /* Generate UUID (big endian) */
 460         gen_rand_uuid(uuid_bin);
 461
 462         /* Convert UUID bin to UUID or GUID formated STRING  */
 463         uuid_bin_to_str(uuid_bin, uuid_str, str_format);
 464 }
 465
 466 #if !defined(CONFIG_SPL_BUILD) && defined(CONFIG_CMD_UUID)
 467 int do_uuid(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 468 {
 469         char uuid[UUID_STR_LEN + 1];
 470         int str_format;
 471
 472         if (!strcmp(argv[0], "uuid"))
 473                 str_format = UUID_STR_FORMAT_STD;
 474         else
 475                 str_format = UUID_STR_FORMAT_GUID;
 476
 477         if (argc > 2)
 478                 return CMD_RET_USAGE;
 479
 480         gen_rand_uuid_str(uuid, str_format);
 481
 482         if (argc == 1)
 483                 printf("%s\n", uuid);
 484         else
 485                 env_set(argv[1], uuid);
 486
 487         return CMD_RET_SUCCESS;
 488 }
 489
 490 U_BOOT_CMD(uuid, CONFIG_SYS_MAXARGS, 1, do_uuid,
 491            "UUID - generate random Universally Unique Identifier",
 492            "[<varname>]\n"
 493            "Argument:\n"
 494            "varname: for set result in a environment variable\n"
 495            "e.g. uuid uuid_env"
 496 );
 497
 498 U_BOOT_CMD(guid, CONFIG_SYS_MAXARGS, 1, do_uuid,
 499            "GUID - generate Globally Unique Identifier based on random UUID",
 500            "[<varname>]\n"
 501            "Argument:\n"
 502            "varname: for set result in a environment variable\n"
 503            "e.g. guid guid_env"
 504 );
 505 #endif /* CONFIG_CMD_UUID */
 506 #endif /* CONFIG_RANDOM_UUID || CONFIG_CMD_UUID */