277 lines
7.1 KiB
C
277 lines
7.1 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/dl.h>
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#include <grub/extcmd.h>
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#include <grub/file.h>
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#include <grub/disk.h>
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#include <grub/mm.h>
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#include <grub/misc.h>
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#include <grub/crypto.h>
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#include <grub/normal.h>
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#include <grub/i18n.h>
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static const struct grub_arg_option options[] = {
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{"hash", 'h', 0, N_("Specify hash to use."), N_("HASH"), ARG_TYPE_STRING},
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{"check", 'c', 0, N_("Check hash list file."), N_("FILE"), ARG_TYPE_STRING},
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{"prefix", 'p', 0, N_("Base directory for hash list."), N_("DIRECTORY"),
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ARG_TYPE_STRING},
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{"keep-going", 'k', 0, N_("Don't stop after first error."), 0, 0},
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{0, 0, 0, 0, 0, 0}
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};
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struct { const char *name; const char *hashname; } aliases[] =
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{
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{"sha256sum", "sha256"},
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{"sha512sum", "sha512"},
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{"md5sum", "md5"},
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};
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static inline int
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hextoval (char c)
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{
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if (c >= '0' && c <= '9')
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return c - '0';
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if (c >= 'a' && c <= 'f')
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return c - 'a' + 10;
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if (c >= 'A' && c <= 'F')
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return c - 'A' + 10;
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return -1;
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}
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static grub_err_t
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hash_file (grub_file_t file, const gcry_md_spec_t *hash, void *result)
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{
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grub_uint8_t context[hash->contextsize];
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grub_uint8_t readbuf[4096];
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grub_memset (context, 0, sizeof (context));
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hash->init (context);
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while (1)
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{
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grub_ssize_t r;
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r = grub_file_read (file, readbuf, sizeof (readbuf));
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if (r < 0)
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return grub_errno;
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if (r == 0)
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break;
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hash->write (context, readbuf, r);
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}
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hash->final (context);
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grub_memcpy (result, hash->read (context), hash->mdlen);
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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check_list (const gcry_md_spec_t *hash, const char *hashfilename,
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const char *prefix, int keep)
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{
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grub_file_t hashlist, file;
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char *buf = NULL;
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grub_uint8_t expected[hash->mdlen];
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grub_uint8_t actual[hash->mdlen];
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grub_err_t err;
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unsigned i;
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unsigned unread = 0, mismatch = 0;
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hashlist = grub_file_open (hashfilename);
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if (!hashlist)
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return grub_errno;
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while (grub_free (buf), (buf = grub_file_getline (hashlist)))
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{
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const char *p = buf;
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for (i = 0; i < hash->mdlen; i++)
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{
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int high, low;
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high = hextoval (*p++);
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low = hextoval (*p++);
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if (high < 0 || low < 0)
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return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid hash list");
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expected[i] = (high << 4) | low;
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}
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if (*p++ != ' ' || *p++ != ' ')
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return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid hash list");
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if (prefix)
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{
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char *filename;
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filename = grub_xasprintf ("%s/%s", prefix, p);
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if (!filename)
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return grub_errno;
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file = grub_file_open (filename);
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grub_free (filename);
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}
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else
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file = grub_file_open (p);
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if (!file)
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{
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grub_file_close (hashlist);
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grub_free (buf);
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return grub_errno;
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}
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err = hash_file (file, hash, actual);
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grub_file_close (file);
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if (err)
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{
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grub_printf ("%s: READ ERROR\n", p);
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if (!keep)
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{
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grub_file_close (hashlist);
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grub_free (buf);
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return err;
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}
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grub_print_error ();
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grub_errno = GRUB_ERR_NONE;
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unread++;
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continue;
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}
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if (grub_crypto_memcmp (expected, actual, hash->mdlen) != 0)
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{
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grub_printf ("%s: HASH MISMATCH\n", p);
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if (!keep)
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{
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grub_file_close (hashlist);
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grub_free (buf);
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return grub_error (GRUB_ERR_TEST_FAILURE,
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"hash of '%s' mismatches", p);
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}
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mismatch++;
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continue;
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}
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grub_printf ("%s: OK\n", p);
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}
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if (mismatch || unread)
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return grub_error (GRUB_ERR_TEST_FAILURE,
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"%d files couldn't be read and hash "
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"of %d files mismatches", unread, mismatch);
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return GRUB_ERR_NONE;
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}
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static grub_err_t
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grub_cmd_hashsum (struct grub_extcmd_context *ctxt,
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int argc, char **args)
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{
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struct grub_arg_list *state = ctxt->state;
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const char *hashname = NULL;
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const char *prefix = NULL;
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const gcry_md_spec_t *hash;
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unsigned i;
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int keep = state[3].set;
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unsigned unread = 0;
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for (i = 0; i < ARRAY_SIZE (aliases); i++)
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if (grub_strcmp (ctxt->extcmd->cmd->name, aliases[i].name) == 0)
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hashname = aliases[i].hashname;
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if (state[0].set)
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hashname = state[0].arg;
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if (!hashname)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "no hash specified");
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hash = grub_crypto_lookup_md_by_name (hashname);
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if (!hash)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, "unknown hash");
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if (state[2].set)
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prefix = state[2].arg;
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if (state[1].set)
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{
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if (argc != 0)
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return grub_error (GRUB_ERR_BAD_ARGUMENT,
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"--check is incompatible with file list");
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return check_list (hash, state[1].arg, prefix, keep);
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}
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for (i = 0; i < (unsigned) argc; i++)
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{
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grub_uint8_t result[hash->mdlen];
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grub_file_t file;
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grub_err_t err;
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unsigned j;
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file = grub_file_open (args[i]);
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if (!file)
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{
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if (!keep)
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return grub_errno;
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grub_print_error ();
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grub_errno = GRUB_ERR_NONE;
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unread++;
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continue;
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}
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err = hash_file (file, hash, result);
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grub_file_close (file);
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if (err)
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{
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if (!keep)
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return err;
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grub_print_error ();
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grub_errno = GRUB_ERR_NONE;
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unread++;
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continue;
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}
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for (j = 0; j < hash->mdlen; j++)
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grub_printf ("%02x", result[j]);
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grub_printf (" %s\n", args[i]);
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}
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if (unread)
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return grub_error (GRUB_ERR_TEST_FAILURE, "%d files couldn't be read.",
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unread);
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return GRUB_ERR_NONE;
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}
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static grub_extcmd_t cmd, cmd_md5, cmd_sha256, cmd_sha512;
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GRUB_MOD_INIT(hashsum)
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{
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cmd = grub_register_extcmd ("hashsum", grub_cmd_hashsum,
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GRUB_COMMAND_FLAG_BOTH,
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"hashsum -h HASH [-c FILE [-p PREFIX]] "
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"[FILE1 [FILE2 ...]]",
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"Compute or check hash checksum.",
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options);
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cmd_md5 = grub_register_extcmd ("md5sum", grub_cmd_hashsum,
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GRUB_COMMAND_FLAG_BOTH,
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N_("[-c FILE [-p PREFIX]] "
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"[FILE1 [FILE2 ...]]"),
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N_("Compute or check hash checksum."),
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options);
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cmd_sha256 = grub_register_extcmd ("sha256sum", grub_cmd_hashsum,
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GRUB_COMMAND_FLAG_BOTH,
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N_("[-c FILE [-p PREFIX]] "
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"[FILE1 [FILE2 ...]]"),
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"Compute or check hash checksum.",
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options);
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cmd_sha512 = grub_register_extcmd ("sha512sum", grub_cmd_hashsum,
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GRUB_COMMAND_FLAG_BOTH,
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N_("[-c FILE [-p PREFIX]] "
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"[FILE1 [FILE2 ...]]"),
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N_("Compute or check hash checksum."),
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options);
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}
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GRUB_MOD_FINI(hashsum)
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{
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grub_unregister_extcmd (cmd);
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grub_unregister_extcmd (cmd_md5);
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grub_unregister_extcmd (cmd_sha256);
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grub_unregister_extcmd (cmd_sha512);
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}
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