Implement Truecrypt ISO loader.
This commit is contained in:
Vladimir Serbinenko
parent
e14d409b6f
commit
3086175489
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@ -1,3 +1,7 @@
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2013-12-17 Vladimir Serbinenko <phcoder@gmail.com>
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Implement Truecrypt ISO loader.
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2013-12-17 Vladimir Serbinenko <phcoder@gmail.com>
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* grub-core/lib/arg.c: Ensure at least a single space between commands.
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@ -1623,6 +1623,14 @@ module = {
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enable = i386_pc;
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};
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module = {
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name = truecrypt;
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i386_pc = loader/i386/pc/truecrypt.c;
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enable = i386_pc;
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};
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module = {
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name = freedos;
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i386_pc = loader/i386/pc/freedos.c;
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@ -1093,7 +1093,7 @@ inflate_window (grub_gzio_t gzio)
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}
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}
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gzio->saved_offset += WSIZE;
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gzio->saved_offset += gzio->wp;
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/* XXX do CRC calculation here! */
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}
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@ -1219,7 +1219,14 @@ grub_gzio_read_real (grub_gzio_t gzio, grub_off_t offset,
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register char *srcaddr;
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while (offset >= gzio->saved_offset)
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inflate_window (gzio);
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{
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inflate_window (gzio);
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if (gzio->wp == 0)
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goto out;
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}
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if (gzio->wp == 0)
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goto out;
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srcaddr = (char *) ((offset & (WSIZE - 1)) + gzio->slide);
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size = gzio->saved_offset - offset;
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@ -1234,6 +1241,7 @@ grub_gzio_read_real (grub_gzio_t gzio, grub_off_t offset,
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offset += size;
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}
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out:
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if (grub_errno != GRUB_ERR_NONE)
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ret = -1;
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@ -1243,7 +1251,15 @@ grub_gzio_read_real (grub_gzio_t gzio, grub_off_t offset,
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static grub_ssize_t
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grub_gzio_read (grub_file_t file, char *buf, grub_size_t len)
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{
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return grub_gzio_read_real (file->data, file->offset, buf, len);
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grub_ssize_t ret;
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ret = grub_gzio_read_real (file->data, file->offset, buf, len);
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if (!grub_errno && ret != (grub_ssize_t) len)
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{
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grub_error (GRUB_ERR_BAD_COMPRESSED_DATA, "premature end of compressed");
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ret = -1;
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}
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return ret;
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}
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/* Release everything, including the underlying file object. */
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@ -1286,10 +1302,38 @@ grub_zlib_decompress (char *inbuf, grub_size_t insize, grub_off_t off,
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ret = grub_gzio_read_real (gzio, off, outbuf, outsize);
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grub_free (gzio);
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if (!grub_errno && ret != (grub_ssize_t) outsize)
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{
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grub_error (GRUB_ERR_BAD_COMPRESSED_DATA, "premature end of compressed");
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ret = -1;
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}
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/* FIXME: Check Adler. */
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return ret;
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}
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grub_ssize_t
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grub_deflate_decompress (char *inbuf, grub_size_t insize, grub_off_t off,
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char *outbuf, grub_size_t outsize)
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{
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grub_gzio_t gzio = 0;
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grub_ssize_t ret;
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gzio = grub_zalloc (sizeof (*gzio));
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if (! gzio)
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return -1;
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gzio->mem_input = (grub_uint8_t *) inbuf;
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gzio->mem_input_size = insize;
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gzio->mem_input_off = 0;
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initialize_tables (gzio);
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ret = grub_gzio_read_real (gzio, off, outbuf, outsize);
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grub_free (gzio);
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return ret;
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}
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static struct grub_fs grub_gzio_fs =
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@ -0,0 +1,233 @@
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/* chainloader.c - boot another boot loader */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2004,2007,2009,2010 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/loader.h>
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#include <grub/file.h>
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#include <grub/err.h>
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#include <grub/device.h>
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#include <grub/disk.h>
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#include <grub/misc.h>
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#include <grub/types.h>
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#include <grub/partition.h>
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#include <grub/dl.h>
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#include <grub/command.h>
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#include <grub/machine/biosnum.h>
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#include <grub/i18n.h>
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#include <grub/video.h>
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#include <grub/mm.h>
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#include <grub/cpu/relocator.h>
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#include <grub/deflate.h>
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GRUB_MOD_LICENSE ("GPLv3+");
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static grub_dl_t my_mod;
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static struct grub_relocator *rel;
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static grub_uint32_t edx = 0xffffffff;
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static grub_uint16_t sp;
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static grub_uint32_t destaddr;
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#define GRUB_TRUECRYPT_SEGMENT 0x2000
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static grub_err_t
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grub_truecrypt_boot (void)
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{
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grub_uint16_t segment = destaddr >> 4;
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struct grub_relocator16_state state = {
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.cs = segment,
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.ds = segment,
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.es = segment,
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.fs = segment,
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.gs = segment,
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.ss = segment,
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.ip = 0x100,
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.sp = sp,
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.edx = edx,
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.a20 = 1
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};
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grub_video_set_mode ("text", 0, 0);
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return grub_relocator16_boot (rel, state);
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}
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static grub_err_t
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grub_truecrypt_unload (void)
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{
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grub_relocator_unload (rel);
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rel = NULL;
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grub_dl_unref (my_mod);
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return GRUB_ERR_NONE;
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}
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/* Information on protocol supplied by Attila Lendvai. */
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#define MAGIC "\0CD001\1EL TORITO SPECIFICATION"
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static grub_err_t
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grub_cmd_truecrypt (grub_command_t cmd __attribute__ ((unused)),
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int argc, char *argv[])
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{
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grub_file_t file = 0;
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grub_err_t err;
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void *truecrypt;
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grub_size_t truecryptsize;
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const grub_size_t truecryptmemsize = 42 * 1024;
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grub_uint8_t dh;
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grub_uint32_t catalog, rba;
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grub_uint8_t buf[128];
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char *compressed = NULL;
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char *uncompressed = NULL;
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if (argc == 0)
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return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("filename expected"));
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rel = NULL;
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grub_dl_ref (my_mod);
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file = grub_file_open (argv[0]);
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if (! file)
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goto fail;
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if (grub_file_seek (file, 17 * 2048) == (grub_size_t) -1)
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goto fail;
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if (grub_file_read (file, buf, sizeof (buf))
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!= sizeof (buf))
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goto fail;
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if (grub_memcmp (buf, MAGIC, sizeof (MAGIC)) != 0)
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{
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grub_error (GRUB_ERR_BAD_OS, "invalid eltorito signature");
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goto fail;
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}
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catalog = grub_get_unaligned32 (buf + 0x47);
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if (grub_file_seek (file, catalog * 2048) == (grub_size_t)-1)
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goto fail;
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if (grub_file_read (file, buf, sizeof (buf))
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!= sizeof (buf))
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goto fail;
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if (buf[0] != 1 || buf[1] != 0 || buf[0x1e] != 0x55
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|| buf[0x1f] != 0xaa || buf[0x20] != 0x88
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|| buf[0x26] != 1 || buf[0x27] != 0)
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{
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grub_error (GRUB_ERR_BAD_OS, "invalid eltorito catalog");
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goto fail;
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}
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rba = grub_get_unaligned32 (buf + 0x28);
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if (grub_file_seek (file, rba * 2048 + 0x1b7) == (grub_size_t) -1)
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goto fail;
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if (grub_file_read (file, &dh, 1)
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!= 1)
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goto fail;
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if (grub_file_seek (file, rba * 2048 + 512 + 2048) == (grub_size_t) -1)
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goto fail;
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compressed = grub_malloc (57 * 512);
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if (!compressed)
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goto fail;
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if (grub_file_read (file, compressed, 57 * 512)
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!= 57 * 512)
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goto fail;
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uncompressed = grub_malloc (truecryptmemsize);
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if (!uncompressed)
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goto fail;
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/* It's actually gzip but our gzip decompressor isn't able to handle
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trailing garbage, hence let's use raw decompressor. */
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truecryptsize = grub_deflate_decompress (compressed + 10, 57 * 512 - 10,
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0, uncompressed, truecryptmemsize);
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if ((grub_ssize_t) truecryptsize < 0)
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goto fail;
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if (truecryptmemsize <= truecryptsize + 0x100)
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{
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grub_error (GRUB_ERR_BAD_OS, "file is too big");
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goto fail;
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}
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rel = grub_relocator_new ();
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if (!rel)
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goto fail;
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edx = (dh << 8) | grub_get_root_biosnumber ();
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destaddr = ALIGN_DOWN (grub_min (0x90000, grub_mmap_get_lower ())
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- truecryptmemsize, 64 * 1024);
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{
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grub_relocator_chunk_t ch;
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err = grub_relocator_alloc_chunk_addr (rel, &ch, destaddr,
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truecryptmemsize);
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if (err)
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goto fail;
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truecrypt = get_virtual_current_address (ch);
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}
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grub_memset (truecrypt, 0, 0x100);
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grub_memcpy ((char *) truecrypt + 0x100, uncompressed, truecryptsize);
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grub_memset ((char *) truecrypt + truecryptsize + 0x100,
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0, truecryptmemsize - truecryptsize - 0x100);
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sp = truecryptmemsize - 4;
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grub_loader_set (grub_truecrypt_boot, grub_truecrypt_unload, 1);
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grub_free (uncompressed);
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grub_free (compressed);
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return GRUB_ERR_NONE;
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fail:
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if (!grub_errno)
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return grub_error (GRUB_ERR_BAD_OS, "bad truecrypt ISO");
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if (file)
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grub_file_close (file);
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grub_truecrypt_unload ();
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grub_free (uncompressed);
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grub_free (compressed);
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return grub_errno;
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}
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static grub_command_t cmd;
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GRUB_MOD_INIT(truecrypt)
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{
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cmd = grub_register_command ("truecrypt", grub_cmd_truecrypt,
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0, N_("Load Truecrypt ISO."));
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my_mod = mod;
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}
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GRUB_MOD_FINI(truecrypt)
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{
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grub_unregister_command (cmd);
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}
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@ -23,4 +23,8 @@ grub_ssize_t
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grub_zlib_decompress (char *inbuf, grub_size_t insize, grub_off_t off,
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char *outbuf, grub_size_t outsize);
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grub_ssize_t
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grub_deflate_decompress (char *inbuf, grub_size_t insize, grub_off_t off,
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char *outbuf, grub_size_t outsize);
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#endif
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