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