Adding upstream version 2.2.40.upstream/2.2.40upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 265 insertions, 0 deletions

diff --git a/g13/mount.c b/g13/mount.c
new file mode 100644
index 0000000..45b6080
--- /dev/null
+++ b/g13/mount.c
@@ -0,0 +1,265 @@
+/* mount.c - Mount a crypto container
+ * Copyright (C) 2009 Free Software Foundation, Inc.
+ *
+ * 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 "../common/i18n.h"
+#include "mount.h"
+
+#include "keyblob.h"
+#include "backend.h"
+#include "g13tuple.h"
+#include "mountinfo.h"
+#include "runner.h"
+#include "../common/host2net.h"
+#include "server.h"  /*(g13_keyblob_decrypt)*/
+#include "../common/sysutils.h"
+#include "call-syshelp.h"
+
+
+/* Mount the container with name FILENAME at MOUNTPOINT.  */
+gpg_error_t
+g13_mount_container (ctrl_t ctrl, const char *filename, const char *mountpoint)
+{
+  gpg_error_t err;
+  dotlock_t lock;
+  int needs_syshelp = 0;
+  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;
+  unsigned int rid;
+  char *mountpoint_buffer = NULL;
+  char *blockdev_buffer = NULL;
+
+  /* Decide whether we need to use the g13-syshelp.  */
+  err = call_syshelp_find_device (ctrl, filename, &blockdev_buffer);
+  if (!err)
+    {
+      needs_syshelp = 1;
+      filename = blockdev_buffer;
+    }
+  else if (gpg_err_code (err) != GPG_ERR_NOT_FOUND)
+    {
+      log_error ("error finding device '%s': %s <%s>\n",
+                 filename, gpg_strerror (err), gpg_strsource (err));
+      return err;
+    }
+  else
+    {
+      /* A quick check to see whether we can the container exists.  */
+      if (gnupg_access (filename, R_OK))
+        return gpg_error_from_syserror ();
+    }
+
+  if (!mountpoint)
+    {
+      mountpoint_buffer = xtrystrdup ("/tmp/g13-XXXXXX");
+      if (!mountpoint_buffer)
+        return gpg_error_from_syserror ();
+      if (!gnupg_mkdtemp (mountpoint_buffer))
+        {
+          err = gpg_error_from_syserror ();
+          log_error (_("can't create directory '%s': %s\n"),
+                     "/tmp/g13-XXXXXX", gpg_strerror (err));
+          xfree (mountpoint_buffer);
+          return err;
+        }
+      mountpoint = mountpoint_buffer;
+    }
+
+  err = 0;
+  if (needs_syshelp)
+    lock = NULL;
+  else
+    {
+      /* Try to take a lock.  */
+      lock = dotlock_create (filename, 0);
+      if (!lock)
+        {
+          xfree (mountpoint_buffer);
+          return gpg_error_from_syserror ();
+        }
+
+      if (dotlock_take (lock, 0))
+        {
+          err = gpg_error_from_syserror ();
+          goto leave;
+        }
+    }
+
+  /* Check again that the file exists.  */
+  if (!needs_syshelp)
+    {
+      struct stat sb;
+
+      if (gnupg_stat (filename, &sb))
+        {
+          err = gpg_error_from_syserror ();
+          goto leave;
+        }
+    }
+
+  /* Read the encrypted keyblob.  */
+  if (needs_syshelp)
+    {
+      err = call_syshelp_set_device (ctrl, filename);
+      if (err)
+        goto leave;
+      err = call_syshelp_get_keyblob (ctrl, &enckeyblob, &enckeybloblen);
+    }
+  else
+    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_mount_container (ctrl, conttype, filename, mountpoint, tuples, &rid);
+  if (err)
+    ;
+  else if (conttype == CONTTYPE_DM_CRYPT)
+    g13_request_shutdown ();
+  else
+    {
+      /* Unless this is a DM-CRYPT mount we put it into our mounttable
+         so that we can manage the mounts ourselves.  For dm-crypt we
+         do not keep a process to monitor he mounts (for now).  */
+      err = mountinfo_add_mount (filename, mountpoint, conttype, rid,
+                                 !!mountpoint_buffer);
+      /* Fixme: What shall we do if this fails?  Add a provisional
+         mountinfo entry first and remove it on error? */
+      if (!err)
+        {
+          char *tmp = percent_plus_escape (mountpoint);
+          if (!tmp)
+            err = gpg_error_from_syserror ();
+          else
+            {
+              g13_status (ctrl, STATUS_MOUNTPOINT, tmp, NULL);
+              xfree (tmp);
+            }
+        }
+    }
+
+ leave:
+  destroy_tupledesc (tuples);
+  xfree (keyblob);
+  xfree (enckeyblob);
+  dotlock_destroy (lock);
+  xfree (mountpoint_buffer);
+  xfree (blockdev_buffer);
+  return err;
+}
+
+
+/* Unmount the container with name FILENAME or the one mounted at
+   MOUNTPOINT.  If both are given the FILENAME takes precedence.  */
+gpg_error_t
+g13_umount_container (ctrl_t ctrl, const char *filename, const char *mountpoint)
+{
+  gpg_error_t err;
+  char *blockdev;
+
+  if (!filename && !mountpoint)
+    return gpg_error (GPG_ERR_ENOENT);
+
+  /* Decide whether we need to use the g13-syshelp.  */
+  err = call_syshelp_find_device (ctrl, filename, &blockdev);
+  if (!err)
+    {
+      /* Need to employ the syshelper to umount the file system.  */
+      /* FIXME: We should get the CONTTYPE from the blockdev.  */
+      err = be_umount_container (ctrl, CONTTYPE_DM_CRYPT, blockdev);
+      if (!err)
+        {
+          /* if (conttype == CONTTYPE_DM_CRYPT) */
+          g13_request_shutdown ();
+        }
+    }
+  else if (gpg_err_code (err) != GPG_ERR_NOT_FOUND)
+    {
+      log_error ("error finding device '%s': %s <%s>\n",
+                 filename, gpg_strerror (err), gpg_strsource (err));
+    }
+  else
+    {
+      /* Not in g13tab - kill the runner process for this mount.  */
+      unsigned int rid;
+      runner_t runner;
+
+      err = mountinfo_find_mount (filename, mountpoint, &rid);
+      if (err)
+        return err;
+
+      runner = runner_find_by_rid (rid);
+      if (!runner)
+        {
+          log_error ("runner %u not found\n", rid);
+          return gpg_error (GPG_ERR_NOT_FOUND);
+        }
+
+      runner_cancel (runner);
+      runner_release (runner);
+    }
+
+  xfree (blockdev);
+  return err;
+}