grub-lakitu/grub-core/commands/hashsum.c - cos/cobble - Git at Google

 /*
  *  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 <http://www.gnu.org/licenses/>.
  */

 #include <grub/dl.h>
 #include <grub/extcmd.h>
 #include <grub/file.h>
 #include <grub/disk.h>
 #include <grub/mm.h>
 #include <grub/misc.h>
 #include <grub/crypto.h>
 #include <grub/normal.h>
 #include <grub/i18n.h>

 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, GRUB_FILE_TYPE_HASHLIST);
   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;
 	  file = grub_file_open (filename, GRUB_FILE_TYPE_TO_HASH
 				 | (!uncompress ? GRUB_FILE_TYPE_NO_DECOMPRESS
 				    : 0));
 	  grub_free (filename);
 	}
       else
 	file = grub_file_open (p, GRUB_FILE_TYPE_TO_HASH
 			       | (!uncompress ? GRUB_FILE_TYPE_NO_DECOMPRESS
 				  : 0));
       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;
       file = grub_file_open (args[i], GRUB_FILE_TYPE_TO_HASH
 			     | (!uncompress ? GRUB_FILE_TYPE_NO_DECOMPRESS
 				: 0));
       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);
 }
	/*
	* 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 <http://www.gnu.org/licenses/>.
	*/

	#include <grub/dl.h>
	#include <grub/extcmd.h>
	#include <grub/file.h>
	#include <grub/disk.h>
	#include <grub/mm.h>
	#include <grub/misc.h>
	#include <grub/crypto.h>
	#include <grub/normal.h>
	#include <grub/i18n.h>

	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, GRUB_FILE_TYPE_HASHLIST);
	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;
	file = grub_file_open (filename, GRUB_FILE_TYPE_TO_HASH
	\| (!uncompress ? GRUB_FILE_TYPE_NO_DECOMPRESS
	: 0));
	grub_free (filename);
	}
	else
	file = grub_file_open (p, GRUB_FILE_TYPE_TO_HASH
	\| (!uncompress ? GRUB_FILE_TYPE_NO_DECOMPRESS
	: 0));
	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;
	file = grub_file_open (args[i], GRUB_FILE_TYPE_TO_HASH
	\| (!uncompress ? GRUB_FILE_TYPE_NO_DECOMPRESS
	: 0));
	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);
	}