3
3
* Askpass-FIFO - Read a password from a FIFO and output it
5
* Copyright © 2008-2011 Teddy Hogeborn
6
* Copyright © 2008-2011 Björn Påhlsson
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
13
* This program is distributed in the hope that it will be useful, but
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
8
* This file is part of Mandos.
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
15
* Mandos is distributed in the hope that it will be useful, but
14
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
18
* General Public License for more details.
18
20
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
22
23
* Contact the authors at <mandos@recompile.se>.
25
26
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
26
#include <sys/types.h> /* ssize_t */
27
#include <sys/types.h> /* uid_t, gid_t, ssize_t */
27
28
#include <sys/stat.h> /* mkfifo(), S_IRUSR, S_IWUSR */
28
29
#include <iso646.h> /* and */
29
30
#include <errno.h> /* errno, EACCES, ENOTDIR, ELOOP,
44
45
#include <string.h> /* strerror() */
45
46
#include <stdarg.h> /* va_list, va_start(), ... */
48
51
/* Function to use when printing errors */
49
52
__attribute__((format (gnu_printf, 3, 4)))
56
59
va_start(ap, formatstring);
57
60
ret = vasprintf(&text, formatstring, ap);
59
62
fprintf(stderr, "Mandos plugin %s: ",
60
63
program_invocation_short_name);
61
64
vfprintf(stderr, formatstring, ap);
62
65
fprintf(stderr, ": ");
63
66
fprintf(stderr, "%s\n", strerror(errnum));
64
67
error(status, errno, "vasprintf while printing error");
69
__builtin_unreachable();
67
73
fprintf(stderr, "Mandos plugin ");
68
74
error(status, errnum, "%s", text);
76
__builtin_unreachable();
86
98
error_plus(EX_OSFILE, errno, "mkfifo");
99
__builtin_unreachable();
87
100
case ENAMETOOLONG:
91
104
error_plus(EX_OSERR, errno, "mkfifo");
105
__builtin_unreachable();
93
107
/* no "/lib/cryptsetup"? */
94
108
error_plus(EX_UNAVAILABLE, errno, "mkfifo");
109
__builtin_unreachable();
96
111
break; /* not an error */
137
/* Lower group privileges */
138
if(setgid(gid) == -1){
139
error_plus(0, errno, "setgid");
142
/* Lower user privileges */
143
if(setuid(uid) == -1){
144
error_plus(0, errno, "setuid");
122
147
/* Read from FIFO */
123
148
char *buf = NULL;
124
149
size_t buf_len = 0;