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/* suspend.c - Suspend/Resume a crypto container
* Copyright (C) 2016 Werner Koch
*
* This file is part of GnuPG.
*
* GnuPG 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.
*
* GnuPG 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 this program; if not, see <https://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <assert.h>
#include "g13.h"
#include "i18n.h"
#include "suspend.h"
#include "keyblob.h"
#include "backend.h"
#include "g13tuple.h"
#include "server.h" /*(g13_keyblob_decrypt)*/
/* Suspend the container with name FILENAME. */
gpg_error_t
g13_suspend_container (ctrl_t ctrl, const char *filename)
{
gpg_error_t err;
int needs_syshelp;
/* A quick check to see whether the container exists. */
if (access (filename, R_OK))
return gpg_error_from_syserror ();
/* Decide whether we need to use the g13-syshelp because we can't
use lock files for them. This is most likely the case for device
files; thus we test for this. FIXME: The correct solution would
be to call g13-syshelp to match the file against the g13tab. */
needs_syshelp = !strncmp (filename, "/dev/", 5);
if (!needs_syshelp)
err = gpg_error (GPG_ERR_NOT_SUPPORTED);
else
err = be_suspend_container (ctrl, CONTTYPE_DM_CRYPT, filename);
return err;
}
/* Resume the container with name FILENAME. */
gpg_error_t
g13_resume_container (ctrl_t ctrl, const char *filename)
{
gpg_error_t err;
int needs_syshelp;
void *enckeyblob = NULL;
size_t enckeybloblen;
void *keyblob = NULL;
size_t keybloblen;
tupledesc_t tuples = NULL;
size_t n;
const unsigned char *value;
int conttype;
char *mountpoint_buffer = NULL;
/* A quick check to see whether the container exists. */
if (access (filename, R_OK))
return gpg_error_from_syserror ();
/* Decide whether we need to use the g13-syshelp because we can't
use lock files for them. This is most likely the case for device
files; thus we test for this. FIXME: The correct solution would
be to call g13-syshelp to match the file against the g13tab. */
needs_syshelp = !strncmp (filename, "/dev/", 5);
if (!needs_syshelp)
{
err = gpg_error (GPG_ERR_NOT_SUPPORTED);
goto leave;
}
/* Read the encrypted keyblob. */
/* Fixme: Should we move this to syshelp for dm-crypt or do we
assume that the encrypted device is world readable? */
err = g13_keyblob_read (filename, &enckeyblob, &enckeybloblen);
if (err)
goto leave;
/* Decrypt that keyblob and store it in a tuple descriptor. */
err = g13_keyblob_decrypt (ctrl, enckeyblob, enckeybloblen,
&keyblob, &keybloblen);
if (err)
goto leave;
xfree (enckeyblob);
enckeyblob = NULL;
err = create_tupledesc (&tuples, keyblob, keybloblen);
if (!err)
keyblob = NULL;
else
{
if (gpg_err_code (err) == GPG_ERR_NOT_SUPPORTED)
log_error ("unknown keyblob version\n");
goto leave;
}
if (opt.verbose)
dump_tupledesc (tuples);
value = find_tuple (tuples, KEYBLOB_TAG_CONTTYPE, &n);
if (!value || n != 2)
conttype = 0;
else
conttype = (value[0] << 8 | value[1]);
if (!be_is_supported_conttype (conttype))
{
log_error ("content type %d is not supported\n", conttype);
err = gpg_error (GPG_ERR_NOT_SUPPORTED);
goto leave;
}
err = be_resume_container (ctrl, conttype, filename, tuples);
leave:
destroy_tupledesc (tuples);
xfree (keyblob);
xfree (enckeyblob);
xfree (mountpoint_buffer);
return err;
}
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