/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2009 Free Software Foundation, Inc.
*
* GRUB is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* GRUB is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GRUB. If not, see .
*/
#include
#include
#include
#include
#include
#include
#include
#include
#include
GRUB_MOD_LICENSE ("GPLv3+");
static const struct grub_arg_option options[] = {
{"hash", 'h', 0, N_("Specify hash to use."), N_("HASH"), ARG_TYPE_STRING},
{"check", 'c', 0, N_("Check hashes of files with hash list FILE."),
N_("FILE"), ARG_TYPE_STRING},
{"prefix", 'p', 0, N_("Base directory for hash list."), N_("DIR"),
ARG_TYPE_STRING},
{"keep-going", 'k', 0, N_("Don't stop after first error."), 0, 0},
{"uncompress", 'u', 0, N_("Uncompress file before checksumming."), 0, 0},
{0, 0, 0, 0, 0, 0}
};
static struct { const char *name; const char *hashname; } aliases[] =
{
{"sha256sum", "sha256"},
{"sha512sum", "sha512"},
{"sha1sum", "sha1"},
{"md5sum", "md5"},
{"crc", "crc32"},
};
static inline int
hextoval (char c)
{
if (c >= '0' && c <= '9')
return c - '0';
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
return -1;
}
static grub_err_t
hash_file (grub_file_t file, const gcry_md_spec_t *hash, void *result)
{
void *context;
grub_uint8_t *readbuf;
#define BUF_SIZE 4096
readbuf = grub_malloc (BUF_SIZE);
if (!readbuf)
return grub_errno;
context = grub_zalloc (hash->contextsize);
if (!readbuf || !context)
goto fail;
hash->init (context);
while (1)
{
grub_ssize_t r;
r = grub_file_read (file, readbuf, BUF_SIZE);
if (r < 0)
goto fail;
if (r == 0)
break;
hash->write (context, readbuf, r);
}
hash->final (context);
grub_memcpy (result, hash->read (context), hash->mdlen);
grub_free (readbuf);
grub_free (context);
return GRUB_ERR_NONE;
fail:
grub_free (readbuf);
grub_free (context);
return grub_errno;
}
static grub_err_t
check_list (const gcry_md_spec_t *hash, const char *hashfilename,
const char *prefix, int keep, int uncompress)
{
grub_file_t hashlist, file;
char *buf = NULL;
grub_uint8_t expected[GRUB_CRYPTO_MAX_MDLEN];
grub_uint8_t actual[GRUB_CRYPTO_MAX_MDLEN];
grub_err_t err;
unsigned i;
unsigned unread = 0, mismatch = 0;
if (hash->mdlen > GRUB_CRYPTO_MAX_MDLEN)
return grub_error (GRUB_ERR_BUG, "mdlen is too long");
hashlist = grub_file_open (hashfilename);
if (!hashlist)
return grub_errno;
while (grub_free (buf), (buf = grub_file_getline (hashlist)))
{
const char *p = buf;
while (grub_isspace (p[0]))
p++;
for (i = 0; i < hash->mdlen; i++)
{
int high, low;
high = hextoval (*p++);
low = hextoval (*p++);
if (high < 0 || low < 0)
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid hash list");
expected[i] = (high << 4) | low;
}
if ((p[0] != ' ' && p[0] != '\t') || (p[1] != ' ' && p[1] != '\t'))
return grub_error (GRUB_ERR_BAD_FILE_TYPE, "invalid hash list");
p += 2;
if (prefix)
{
char *filename;
filename = grub_xasprintf ("%s/%s", prefix, p);
if (!filename)
return grub_errno;
if (!uncompress)
grub_file_filter_disable_compression ();
file = grub_file_open (filename);
grub_free (filename);
}
else
{
if (!uncompress)
grub_file_filter_disable_compression ();
file = grub_file_open (p);
}
if (!file)
{
grub_file_close (hashlist);
grub_free (buf);
return grub_errno;
}
err = hash_file (file, hash, actual);
grub_file_close (file);
if (err)
{
grub_printf_ (N_("%s: READ ERROR\n"), p);
if (!keep)
{
grub_file_close (hashlist);
grub_free (buf);
return err;
}
grub_print_error ();
grub_errno = GRUB_ERR_NONE;
unread++;
continue;
}
if (grub_crypto_memcmp (expected, actual, hash->mdlen) != 0)
{
grub_printf_ (N_("%s: HASH MISMATCH\n"), p);
if (!keep)
{
grub_file_close (hashlist);
grub_free (buf);
return grub_error (GRUB_ERR_TEST_FAILURE,
"hash of '%s' mismatches", p);
}
mismatch++;
continue;
}
grub_printf_ (N_("%s: OK\n"), p);
}
if (mismatch || unread)
return grub_error (GRUB_ERR_TEST_FAILURE,
"%d files couldn't be read and hash "
"of %d files mismatches", unread, mismatch);
return GRUB_ERR_NONE;
}
static grub_err_t
grub_cmd_hashsum (struct grub_extcmd_context *ctxt,
int argc, char **args)
{
struct grub_arg_list *state = ctxt->state;
const char *hashname = NULL;
const char *prefix = NULL;
const gcry_md_spec_t *hash;
unsigned i;
int keep = state[3].set;
int uncompress = state[4].set;
unsigned unread = 0;
for (i = 0; i < ARRAY_SIZE (aliases); i++)
if (grub_strcmp (ctxt->extcmd->cmd->name, aliases[i].name) == 0)
hashname = aliases[i].hashname;
if (state[0].set)
hashname = state[0].arg;
if (!hashname)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "no hash specified");
hash = grub_crypto_lookup_md_by_name (hashname);
if (!hash)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "unknown hash");
if (hash->mdlen > GRUB_CRYPTO_MAX_MDLEN)
return grub_error (GRUB_ERR_BUG, "mdlen is too long");
if (state[2].set)
prefix = state[2].arg;
if (state[1].set)
{
if (argc != 0)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"--check is incompatible with file list");
return check_list (hash, state[1].arg, prefix, keep, uncompress);
}
for (i = 0; i < (unsigned) argc; i++)
{
GRUB_PROPERLY_ALIGNED_ARRAY (result, GRUB_CRYPTO_MAX_MDLEN);
grub_file_t file;
grub_err_t err;
unsigned j;
if (!uncompress)
grub_file_filter_disable_compression ();
file = grub_file_open (args[i]);
if (!file)
{
if (!keep)
return grub_errno;
grub_print_error ();
grub_errno = GRUB_ERR_NONE;
unread++;
continue;
}
err = hash_file (file, hash, result);
grub_file_close (file);
if (err)
{
if (!keep)
return err;
grub_print_error ();
grub_errno = GRUB_ERR_NONE;
unread++;
continue;
}
for (j = 0; j < hash->mdlen; j++)
grub_printf ("%02x", ((grub_uint8_t *) result)[j]);
grub_printf (" %s\n", args[i]);
}
if (unread)
return grub_error (GRUB_ERR_TEST_FAILURE, "%d files couldn't be read",
unread);
return GRUB_ERR_NONE;
}
static grub_extcmd_t cmd, cmd_md5, cmd_sha1, cmd_sha256, cmd_sha512, cmd_crc;
GRUB_MOD_INIT(hashsum)
{
cmd = grub_register_extcmd ("hashsum", grub_cmd_hashsum, 0,
N_("-h HASH [-c FILE [-p PREFIX]] "
"[FILE1 [FILE2 ...]]"),
/* TRANSLATORS: "hash checksum" is just to
be a bit more precise, you can treat it as
just "hash". */
N_("Compute or check hash checksum."),
options);
cmd_md5 = grub_register_extcmd ("md5sum", grub_cmd_hashsum, 0,
N_("[-c FILE [-p PREFIX]] "
"[FILE1 [FILE2 ...]]"),
N_("Compute or check hash checksum."),
options);
cmd_sha1 = grub_register_extcmd ("sha1sum", grub_cmd_hashsum, 0,
N_("[-c FILE [-p PREFIX]] "
"[FILE1 [FILE2 ...]]"),
N_("Compute or check hash checksum."),
options);
cmd_sha256 = grub_register_extcmd ("sha256sum", grub_cmd_hashsum, 0,
N_("[-c FILE [-p PREFIX]] "
"[FILE1 [FILE2 ...]]"),
N_("Compute or check hash checksum."),
options);
cmd_sha512 = grub_register_extcmd ("sha512sum", grub_cmd_hashsum, 0,
N_("[-c FILE [-p PREFIX]] "
"[FILE1 [FILE2 ...]]"),
N_("Compute or check hash checksum."),
options);
cmd_crc = grub_register_extcmd ("crc", grub_cmd_hashsum, 0,
N_("[-c FILE [-p PREFIX]] "
"[FILE1 [FILE2 ...]]"),
N_("Compute or check hash checksum."),
options);
}
GRUB_MOD_FINI(hashsum)
{
grub_unregister_extcmd (cmd);
grub_unregister_extcmd (cmd_md5);
grub_unregister_extcmd (cmd_sha1);
grub_unregister_extcmd (cmd_sha256);
grub_unregister_extcmd (cmd_sha512);
grub_unregister_extcmd (cmd_crc);
}