GRUB2/MOD_SRC/grub-2.04/grub-core/commands/hashsum.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2009  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/dl.h>
  20 #include <grub/extcmd.h>
  21 #include <grub/file.h>
  22 #include <grub/disk.h>
  23 #include <grub/mm.h>
  24 #include <grub/misc.h>
  25 #include <grub/crypto.h>
  26 #include <grub/normal.h>
  27 #include <grub/i18n.h>
  28
  29 GRUB_MOD_LICENSE ("GPLv3+");
  30
  31 static const struct grub_arg_option options[] = {
  32   {"hash", 'h', 0, N_("Specify hash to use."), N_("HASH"), ARG_TYPE_STRING},
  33   {"check", 'c', 0, N_("Check hashes of files with hash list FILE."),
  34    N_("FILE"), ARG_TYPE_STRING},
  35   {"prefix", 'p', 0, N_("Base directory for hash list."), N_("DIR"),
  36    ARG_TYPE_STRING},
  37   {"keep-going", 'k', 0, N_("Don't stop after first error."), 0, 0},
  38   {"uncompress", 'u', 0, N_("Uncompress file before checksumming."), 0, 0},
  39   {0, 0, 0, 0, 0, 0}
  40 };
  41
  42 static struct { const char *name; const char *hashname; } aliases[] =
  43   {
  44     {"sha256sum", "sha256"},
  45     {"sha512sum", "sha512"},
  46     {"sha1sum", "sha1"},
  47     {"md5sum", "md5"},
  48     {"crc", "crc32"},
  49   };
  50
  51 static inline int
  52 hextoval (char c)
  53 {
  54   if (c >= '0' && c <= '9')
  55     return c - '0';
  56   if (c >= 'a' && c <= 'f')
  57     return c - 'a' + 10;
  58   if (c >= 'A' && c <= 'F')
  59     return c - 'A' + 10;
  60   return -1;
  61 }
  62
  63 static grub_err_t
  64 hash_file (grub_file_t file, const gcry_md_spec_t *hash, void *result)
  65 {
  66   int progress = 0;
  67   grub_uint64_t ro = 0;
  68   grub_uint64_t div = 0;
  69   grub_uint64_t total = 0;
  70   void *context;
  71   grub_uint8_t *readbuf;
  72 #define BUF_SIZE 1024 * 1024
  73   readbuf = grub_malloc (BUF_SIZE);
  74   if (!readbuf)
  75     return grub_errno;
  76   context = grub_zalloc (hash->contextsize);
  77   if (!readbuf || !context)
  78     goto fail;
  79
  80   if (file->size > 16 * 1024 * 1024)
  81     progress = 1;
  82
  83   hash->init (context);
  84   while (1)
  85     {
  86       grub_ssize_t r;
  87       r = grub_file_read (file, readbuf, BUF_SIZE);
  88       if (r < 0)
  89         goto fail;
  90       if (r == 0)
  91         break;
  92       hash->write (context, readbuf, r);
  93       if (progress)
  94       {
  95           total += r;
  96           div = grub_divmod64(total * 100, (grub_uint64_t)file->size, &ro);
  97           grub_printf("\rCalculating    %s   %d%%    ", hash->name, (int)div);
  98           grub_refresh();
  99       }
 100     }
 101   hash->final (context);
 102   grub_memcpy (result, hash->read (context), hash->mdlen);
 103
 104   grub_free (readbuf);
 105   grub_free (context);
 106   if (progress)
 107   {
 108     grub_printf("\rCalculating    %s   100%%    \n\r\n", hash->name);
 109     grub_refresh();
 110   }
 111   return GRUB_ERR_NONE;
 112
 113  fail:
 114   grub_free (readbuf);
 115   grub_free (context);
 116   return grub_errno;
 117 }
 118
 119 static grub_err_t
 120 check_list (const gcry_md_spec_t *hash, const char *hashfilename,
 121             const char *prefix, int keep, int uncompress)
 122 {
 123   grub_file_t hashlist, file;
 124   char *buf = NULL;
 125   grub_uint8_t expected[GRUB_CRYPTO_MAX_MDLEN];
 126   grub_uint8_t actual[GRUB_CRYPTO_MAX_MDLEN];
 127   grub_err_t err;
 128   unsigned i;
 129   unsigned unread = 0, mismatch = 0;
 130
 131   if (hash->mdlen > GRUB_CRYPTO_MAX_MDLEN)
 132     return grub_error (GRUB_ERR_BUG, "mdlen is too long");
 133
 134   hashlist = grub_file_open (hashfilename, GRUB_FILE_TYPE_HASHLIST);
 135   if (!hashlist)
 136     return grub_errno;
 137
 138   while (grub_free (buf), (buf = grub_file_getline (hashlist)))
 139     {
 140       const char *p = buf;
 141       while (grub_isspace (p[0]))
 142         p++;
 143       for (i = 0; i < hash->mdlen; i++)
 144         {
 145           int high, low;
 146           high = hextoval (*p++);
 147           low = hextoval (*p++);
 148           if (high < 0 || low < 0)
 149             return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid hash list");
 150           expected[i] = (high << 4) | low;
 151         }
 152       if ((p[0] != ' ' && p[0] != '\t') || (p[1] != ' ' && p[1] != '\t'))
 153         return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid hash list");
 154       p += 2;
 155       if (prefix)
 156         {
 157           char *filename;
 158
 159           filename = grub_xasprintf ("%s/%s", prefix, p);
 160           if (!filename)
 161             return grub_errno;
 162           file = grub_file_open (filename, GRUB_FILE_TYPE_TO_HASH
 163                                  | (!uncompress ? GRUB_FILE_TYPE_NO_DECOMPRESS
 164                                     : GRUB_FILE_TYPE_NONE));
 165           grub_free (filename);
 166         }
 167       else
 168         file = grub_file_open (p, GRUB_FILE_TYPE_TO_HASH
 169                                | (!uncompress ? GRUB_FILE_TYPE_NO_DECOMPRESS
 170                                   : GRUB_FILE_TYPE_NONE));
 171       if (!file)
 172         {
 173           grub_file_close (hashlist);
 174           grub_free (buf);
 175           return grub_errno;
 176         }
 177       err = hash_file (file, hash, actual);
 178       grub_file_close (file);
 179       if (err)
 180         {
 181           grub_printf_ (N_("%s: READ ERROR\n"), p);
 182           if (!keep)
 183             {
 184               grub_file_close (hashlist);
 185               grub_free (buf);
 186               return err;
 187             }
 188           grub_print_error ();
 189           grub_errno = GRUB_ERR_NONE;
 190           unread++;
 191           continue;
 192         }
 193       if (grub_crypto_memcmp (expected, actual, hash->mdlen) != 0)
 194         {
 195           grub_printf_ (N_("%s: HASH MISMATCH\n"), p);
 196           if (!keep)
 197             {
 198               grub_file_close (hashlist);
 199               grub_free (buf);
 200               return grub_error (GRUB_ERR_TEST_FAILURE,
 201                                  "hash of '%s' mismatches", p);
 202             }
 203           mismatch++;
 204           continue;
 205         }
 206       grub_printf_ (N_("%s: OK\n"), p);
 207     }
 208   if (mismatch || unread)
 209     return grub_error (GRUB_ERR_TEST_FAILURE,
 210                        "%d files couldn't be read and hash "
 211                        "of %d files mismatches", unread, mismatch);
 212   return GRUB_ERR_NONE;
 213 }
 214
 215 static grub_err_t
 216 grub_cmd_hashsum (struct grub_extcmd_context *ctxt,
 217                   int argc, char **args)
 218 {
 219   struct grub_arg_list *state = ctxt->state;
 220   const char *hashname = NULL;
 221   const char *prefix = NULL;
 222   const gcry_md_spec_t *hash;
 223   unsigned i;
 224   int keep = state[3].set;
 225   int uncompress = state[4].set;
 226   unsigned unread = 0;
 227   int len = 0;
 228   char hashsum[256];
 229
 230   for (i = 0; i < ARRAY_SIZE (aliases); i++)
 231     if (grub_strcmp (ctxt->extcmd->cmd->name, aliases[i].name) == 0)
 232       hashname = aliases[i].hashname;
 233   if (state[0].set)
 234     hashname = state[0].arg;
 235
 236   if (!hashname)
 237     return grub_error (GRUB_ERR_BAD_ARGUMENT, "no hash specified");
 238
 239   hash = grub_crypto_lookup_md_by_name (hashname);
 240   if (!hash)
 241     return grub_error (GRUB_ERR_BAD_ARGUMENT, "unknown hash");
 242
 243   if (hash->mdlen > GRUB_CRYPTO_MAX_MDLEN)
 244     return grub_error (GRUB_ERR_BUG, "mdlen is too long");
 245
 246   if (state[2].set)
 247     prefix = state[2].arg;
 248
 249   if (state[1].set)
 250     {
 251       if (argc != 0)
 252         return grub_error (GRUB_ERR_BAD_ARGUMENT,
 253                            "--check is incompatible with file list");
 254       return check_list (hash, state[1].arg, prefix, keep, uncompress);
 255     }
 256
 257   for (i = 0; i < (unsigned) argc; i++)
 258     {
 259       GRUB_PROPERLY_ALIGNED_ARRAY (result, GRUB_CRYPTO_MAX_MDLEN);
 260       grub_file_t file;
 261       grub_err_t err;
 262       unsigned j;
 263       int vlnk = 0;
 264       file = grub_file_open (args[i], GRUB_FILE_TYPE_TO_HASH
 265                              | (!uncompress ? GRUB_FILE_TYPE_NO_DECOMPRESS
 266                                 : GRUB_FILE_TYPE_NONE));
 267       if (!file)
 268         {
 269           if (!keep)
 270             return grub_errno;
 271           grub_print_error ();
 272           grub_errno = GRUB_ERR_NONE;
 273           unread++;
 274           continue;
 275         }
 276       vlnk = file->vlnk;
 277       err = hash_file (file, hash, result);
 278       grub_file_close (file);
 279       if (err)
 280         {
 281           if (!keep)
 282             return err;
 283           grub_print_error ();
 284           grub_errno = GRUB_ERR_NONE;
 285           unread++;
 286           continue;
 287         }
 288       for (j = 0; j < hash->mdlen; j++)
 289           {
 290             grub_printf ("%02x", ((grub_uint8_t *) result)[j]);
 291         len += grub_snprintf(hashsum + len, sizeof(hashsum) - len, "%02x", ((grub_uint8_t *) result)[j]);
 292       }
 293       grub_printf ("  %s\n", vlnk ? grub_file_get_vlnk(args[i], NULL) : args[i]);
 294       grub_env_set("VT_LAST_CHECK_SUM", hashsum);
 295     }
 296
 297   if (unread)
 298     return grub_error (GRUB_ERR_TEST_FAILURE, "%d files couldn't be read",
 299                        unread);
 300   return GRUB_ERR_NONE;
 301 }
 302
 303 static grub_extcmd_t cmd, cmd_md5, cmd_sha1, cmd_sha256, cmd_sha512, cmd_crc;
 304
 305 GRUB_MOD_INIT(hashsum)
 306 {
 307   cmd = grub_register_extcmd ("hashsum", grub_cmd_hashsum, 0,
 308                               N_("-h HASH [-c FILE [-p PREFIX]] "
 309                                  "[FILE1 [FILE2 ...]]"),
 310                               /* TRANSLATORS: "hash checksum" is just to
 311                                  be a bit more precise, you can treat it as
 312                                  just "hash".  */
 313                               N_("Compute or check hash checksum."),
 314                               options);
 315   cmd_md5 = grub_register_extcmd ("md5sum", grub_cmd_hashsum, 0,
 316                                   N_("[-c FILE [-p PREFIX]] "
 317                                      "[FILE1 [FILE2 ...]]"),
 318                                   N_("Compute or check hash checksum."),
 319                                   options);
 320   cmd_sha1 = grub_register_extcmd ("sha1sum", grub_cmd_hashsum, 0,
 321                                    N_("[-c FILE [-p PREFIX]] "
 322                                       "[FILE1 [FILE2 ...]]"),
 323                                    N_("Compute or check hash checksum."),
 324                                    options);
 325   cmd_sha256 = grub_register_extcmd ("sha256sum", grub_cmd_hashsum, 0,
 326                                      N_("[-c FILE [-p PREFIX]] "
 327                                         "[FILE1 [FILE2 ...]]"),
 328                                      N_("Compute or check hash checksum."),
 329                                      options);
 330   cmd_sha512 = grub_register_extcmd ("sha512sum", grub_cmd_hashsum, 0,
 331                                      N_("[-c FILE [-p PREFIX]] "
 332                                         "[FILE1 [FILE2 ...]]"),
 333                                      N_("Compute or check hash checksum."),
 334                                      options);
 335
 336   cmd_crc = grub_register_extcmd ("crc", grub_cmd_hashsum, 0,
 337                                      N_("[-c FILE [-p PREFIX]] "
 338                                         "[FILE1 [FILE2 ...]]"),
 339                                      N_("Compute or check hash checksum."),
 340                                      options);
 341 }
 342
 343 GRUB_MOD_FINI(hashsum)
 344 {
 345   grub_unregister_extcmd (cmd);
 346   grub_unregister_extcmd (cmd_md5);
 347   grub_unregister_extcmd (cmd_sha1);
 348   grub_unregister_extcmd (cmd_sha256);
 349   grub_unregister_extcmd (cmd_sha512);
 350   grub_unregister_extcmd (cmd_crc);
 351 }