Line data    Source code

       1             : /* passphrase.c -  Get a passphrase
       2             :  * Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
       3             :  *               2005, 2006, 2007, 2009, 2011 Free Software Foundation, Inc.
       4             :  *
       5             :  * This file is part of GnuPG.
       6             :  *
       7             :  * GnuPG is free software; you can redistribute it and/or modify
       8             :  * it under the terms of the GNU General Public License as published by
       9             :  * the Free Software Foundation; either version 3 of the License, or
      10             :  * (at your option) any later version.
      11             :  *
      12             :  * GnuPG is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      15             :  * GNU General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU General Public License
      18             :  * along with this program; if not, see <https://www.gnu.org/licenses/>.
      19             :  */
      20             : 
      21             : #include <config.h>
      22             : #include <unistd.h>
      23             : 
      24             : #include "passphrase.h"
      25             : #include "gpgsm.h"
      26             : #include "../common/shareddefs.h"
      27             : #include "../common/ttyio.h"
      28             : 
      29             : static char *fd_passwd = NULL;
      30             : 
      31             : int
      32           0 : have_static_passphrase ()
      33             : {
      34           0 :   return (!!fd_passwd
      35           0 :           && (opt.batch || opt.pinentry_mode == PINENTRY_MODE_LOOPBACK));
      36             : }
      37             : 
      38             : /* Return a static passphrase.  The returned value is only valid as
      39             :    long as no other passphrase related function is called.  NULL may
      40             :    be returned if no passphrase has been set; better use
      41             :    have_static_passphrase first.  */
      42             : const char *
      43           0 : get_static_passphrase (void)
      44             : {
      45           0 :   return fd_passwd;
      46             : }
      47             : 
      48             : void
      49           0 : read_passphrase_from_fd (int fd)
      50             : {
      51             :   int i, len;
      52             :   char *pw;
      53             : 
      54           0 :   if (!opt.batch && opt.pinentry_mode != PINENTRY_MODE_LOOPBACK)
      55             :     { /* Not used but we have to do a dummy read, so that it won't end
      56             :          up at the begin of the message if the quite usual trick to
      57             :          prepend the passphtrase to the message is used. */
      58             :       char buf[1];
      59             : 
      60           0 :       while (!(read (fd, buf, 1) != 1 || *buf == '\n'))
      61             :         ;
      62           0 :       *buf = 0;
      63           0 :       return;
      64             :     }
      65             : 
      66           0 :   for (pw = NULL, i = len = 100; ; i++)
      67             :     {
      68           0 :       if (i >= len-1)
      69             :         {
      70           0 :           char *pw2 = pw;
      71           0 :           len += 100;
      72           0 :           pw = xmalloc_secure (len);
      73           0 :           if (pw2)
      74             :             {
      75           0 :               memcpy (pw, pw2, i);
      76           0 :               xfree (pw2);
      77             :             }
      78             :           else
      79           0 :             i = 0;
      80             :         }
      81           0 :       if (read (fd, pw+i, 1) != 1 || pw[i] == '\n')
      82             :         break;
      83           0 :     }
      84           0 :   pw[i] = 0;
      85           0 :   if (!opt.batch && opt.pinentry_mode != PINENTRY_MODE_LOOPBACK)
      86           0 :     tty_printf("\b\b\b   \n" );
      87             : 
      88           0 :   xfree (fd_passwd);
      89           0 :   fd_passwd = pw;
      90             : }