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f02ceb6c6e
* g13/mount.c (g13_mount_container): Do not run the first access check if syshelp is required. Signed-off-by: Werner Koch <wk@gnupg.org>
266 lines
7.0 KiB
C
266 lines
7.0 KiB
C
/* mount.c - Mount a crypto container
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* Copyright (C) 2009 Free Software Foundation, Inc.
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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 <http://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 "i18n.h"
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#include "mount.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 "mountinfo.h"
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#include "runner.h"
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#include "host2net.h"
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#include "server.h" /*(g13_keyblob_decrypt)*/
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#include "../common/sysutils.h"
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#include "call-syshelp.h"
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/* Mount the container with name FILENAME at MOUNTPOINT. */
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gpg_error_t
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g13_mount_container (ctrl_t ctrl, const char *filename, const char *mountpoint)
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{
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gpg_error_t err;
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dotlock_t lock;
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int needs_syshelp = 0;
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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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unsigned int rid;
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char *mountpoint_buffer = NULL;
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char *blockdev_buffer = NULL;
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/* Decide whether we need to use the g13-syshelp. */
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err = call_syshelp_find_device (ctrl, filename, &blockdev_buffer);
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if (!err)
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{
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needs_syshelp = 1;
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filename = blockdev_buffer;
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}
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else if (gpg_err_code (err) != GPG_ERR_NOT_FOUND)
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{
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log_error ("error finding device '%s': %s <%s>\n",
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filename, gpg_strerror (err), gpg_strsource (err));
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return err;
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}
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else
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{
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/* A quick check to see whether we can the container exists. */
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if (access (filename, R_OK))
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return gpg_error_from_syserror ();
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}
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if (!mountpoint)
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{
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mountpoint_buffer = xtrystrdup ("/tmp/g13-XXXXXX");
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if (!mountpoint_buffer)
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return gpg_error_from_syserror ();
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if (!gnupg_mkdtemp (mountpoint_buffer))
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{
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err = gpg_error_from_syserror ();
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log_error (_("can't create directory '%s': %s\n"),
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"/tmp/g13-XXXXXX", gpg_strerror (err));
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xfree (mountpoint_buffer);
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return err;
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}
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mountpoint = mountpoint_buffer;
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}
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err = 0;
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if (needs_syshelp)
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lock = NULL;
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else
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{
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/* Try to take a lock. */
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lock = dotlock_create (filename, 0);
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if (!lock)
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{
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xfree (mountpoint_buffer);
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return gpg_error_from_syserror ();
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}
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if (dotlock_take (lock, 0))
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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}
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/* Check again that the file exists. */
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if (!needs_syshelp)
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{
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struct stat sb;
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if (stat (filename, &sb))
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{
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err = gpg_error_from_syserror ();
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goto leave;
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}
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}
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/* Read the encrypted keyblob. */
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if (needs_syshelp)
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{
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err = call_syshelp_set_device (ctrl, filename);
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if (err)
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goto leave;
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err = call_syshelp_get_keyblob (ctrl, &enckeyblob, &enckeybloblen);
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}
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else
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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_mount_container (ctrl, conttype, filename, mountpoint, tuples, &rid);
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if (err)
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;
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else if (conttype == CONTTYPE_DM_CRYPT)
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g13_request_shutdown ();
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else
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{
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/* Unless this is a DM-CRYPT mount we put it into our mounttable
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so that we can manage the mounts ourselves. For dm-crypt we
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do not keep a process to monitor he mounts (for now). */
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err = mountinfo_add_mount (filename, mountpoint, conttype, rid,
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!!mountpoint_buffer);
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/* Fixme: What shall we do if this fails? Add a provisional
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mountinfo entry first and remove it on error? */
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if (!err)
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{
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char *tmp = percent_plus_escape (mountpoint);
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if (!tmp)
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err = gpg_error_from_syserror ();
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else
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{
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g13_status (ctrl, STATUS_MOUNTPOINT, tmp, NULL);
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xfree (tmp);
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}
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}
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}
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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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dotlock_destroy (lock);
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xfree (mountpoint_buffer);
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xfree (blockdev_buffer);
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return err;
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}
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/* Unmount the container with name FILENAME or the one mounted at
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MOUNTPOINT. If both are given the FILENAME takes precedence. */
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gpg_error_t
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g13_umount_container (ctrl_t ctrl, const char *filename, const char *mountpoint)
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{
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gpg_error_t err;
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char *blockdev;
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if (!filename && !mountpoint)
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return gpg_error (GPG_ERR_ENOENT);
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/* Decide whether we need to use the g13-syshelp. */
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err = call_syshelp_find_device (ctrl, filename, &blockdev);
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if (!err)
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{
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/* Need to employ the syshelper to umount the file system. */
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/* FIXME: We should get the CONTTYPE from the blockdev. */
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err = be_umount_container (ctrl, CONTTYPE_DM_CRYPT, blockdev);
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if (!err)
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{
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/* if (conttype == CONTTYPE_DM_CRYPT) */
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g13_request_shutdown ();
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}
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}
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else if (gpg_err_code (err) != GPG_ERR_NOT_FOUND)
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{
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log_error ("error finding device '%s': %s <%s>\n",
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filename, gpg_strerror (err), gpg_strsource (err));
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}
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else
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{
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/* Not in g13tab - kill the runner process for this mount. */
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unsigned int rid;
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runner_t runner;
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err = mountinfo_find_mount (filename, mountpoint, &rid);
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if (err)
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return err;
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runner = runner_find_by_rid (rid);
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if (!runner)
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{
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log_error ("runner %u not found\n", rid);
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return gpg_error (GPG_ERR_NOT_FOUND);
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}
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runner_cancel (runner);
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runner_release (runner);
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}
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xfree (blockdev);
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return err;
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}
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