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 <http://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 : }
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