Line data    Source code

       1             : /* migrate.c - Migrate from earlier GnupG versions.
       2             :  * Copyright (C) 2014 Werner Koch
       3             :  *
       4             :  * This file is part of GnuPG.
       5             :  *
       6             :  * GnuPG is free software; you can redistribute it and/or modify
       7             :  * it under the terms of the GNU General Public License as published by
       8             :  * the Free Software Foundation; either version 3 of the License, or
       9             :  * (at your option) any later version.
      10             :  *
      11             :  * GnuPG is distributed in the hope that it will be useful,
      12             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      13             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14             :  * GNU General Public License for more details.
      15             :  *
      16             :  * You should have received a copy of the GNU General Public License
      17             :  * along with this program; if not, see <https://www.gnu.org/licenses/>.
      18             :  */
      19             : 
      20             : #include <config.h>
      21             : #include <stdio.h>
      22             : #include <stdlib.h>
      23             : #include <string.h>
      24             : #include <errno.h>
      25             : #include <unistd.h>
      26             : 
      27             : #include "gpg.h"
      28             : #include "options.h"
      29             : #include "keydb.h"
      30             : #include "util.h"
      31             : #include "main.h"
      32             : #include "call-agent.h"
      33             : 
      34             : 
      35             : #ifdef HAVE_DOSISH_SYSTEM
      36             : # define V21_MIGRATION_FNAME "gpg-v21-migrated"
      37             : #else
      38             : # define V21_MIGRATION_FNAME ".gpg-v21-migrated"
      39             : #endif
      40             : 
      41             : 
      42             : /* Check whether a default secring.gpg from GnuPG < 2.1 exists and
      43             :    import it if not yet done.  */
      44             : void
      45         240 : migrate_secring (ctrl_t ctrl)
      46             : {
      47         240 :   dotlock_t lockhd = NULL;
      48         240 :   char *secring = NULL;
      49         240 :   char *flagfile = NULL;
      50         240 :   char *agent_version = NULL;
      51             : 
      52         240 :   secring = make_filename (gnupg_homedir (), "secring" EXTSEP_S "gpg", NULL);
      53         240 :   if (access (secring, F_OK))
      54         228 :     goto leave; /* Does not exist or is not readable.  */
      55          12 :   flagfile = make_filename (gnupg_homedir (), V21_MIGRATION_FNAME, NULL);
      56          12 :   if (!access (flagfile, F_OK))
      57           9 :     goto leave; /* Does exist - fine.  */
      58             : 
      59           3 :   log_info ("starting migration from earlier GnuPG versions\n");
      60             : 
      61           3 :   lockhd = dotlock_create (flagfile, 0);
      62           3 :   if (!lockhd)
      63             :     {
      64           0 :       log_error ("can't allocate lock for '%s': %s\n",
      65             :                  flagfile, gpg_strerror (gpg_error_from_syserror ()));
      66           0 :       goto leave;
      67             :     }
      68           3 :   if (dotlock_take (lockhd, -1))
      69             :     {
      70           0 :       log_error ("can't lock '%s': %s\n",
      71             :                  flagfile, gpg_strerror (gpg_error_from_syserror ()));
      72           0 :       dotlock_destroy (lockhd);
      73           0 :       lockhd = NULL;
      74           0 :       goto leave;
      75             :     }
      76             : 
      77           3 :   if (!agent_get_version (ctrl, &agent_version))
      78             :     {
      79           3 :       if (!gnupg_compare_version (agent_version, "2.1.0"))
      80             :         {
      81           0 :           log_error ("error: GnuPG agent version \"%s\" is too old. ",
      82             :                      agent_version);
      83           0 :           log_info ("Please make sure that a recent gpg-agent is running.\n");
      84           0 :           log_info ("(restarting the user session may achieve this.)\n");
      85           0 :           log_info ("migration aborted\n");
      86           0 :           xfree (agent_version);
      87           0 :           goto leave;
      88             :         }
      89           3 :       xfree (agent_version);
      90             :     }
      91             :   else
      92             :     {
      93           0 :       log_error ("error: GnuPG agent unusable. "
      94             :                  "Please check that a GnuPG agent can be started.\n");
      95           0 :       log_error ("migration aborted\n");
      96           0 :       goto leave;
      97             :     }
      98             : 
      99           3 :   log_info ("porting secret keys from '%s' to gpg-agent\n", secring);
     100           3 :   if (!import_old_secring (ctrl, secring))
     101             :     {
     102           3 :       FILE *fp = fopen (flagfile, "w");
     103           3 :       if (!fp || fclose (fp))
     104           0 :         log_error ("error creating flag file '%s': %s\n",
     105             :                    flagfile, gpg_strerror (gpg_error_from_syserror ()));
     106             :       else
     107           3 :         log_info ("migration succeeded\n");
     108             :     }
     109             : 
     110             :  leave:
     111         240 :   if (lockhd)
     112             :     {
     113           3 :       dotlock_release (lockhd);
     114           3 :       dotlock_destroy (lockhd);
     115             :     }
     116         240 :   xfree (flagfile);
     117         240 :   xfree (secring);
     118         240 : }