1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
3
* Password-prompt - Read a password from the terminal and print it
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* General Public License for more details.
18
* 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/>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
25
#define _GNU_SOURCE /* getline() */
27
#include <termios.h> /* struct termios, tcsetattr(),
28
TCSAFLUSH, tcgetattr(), ECHO */
29
#include <unistd.h> /* struct termios, tcsetattr(),
30
STDIN_FILENO, TCSAFLUSH,
32
#include <signal.h> /* sig_atomic_t, raise(), struct
33
sigaction, sigemptyset(),
34
sigaction(), sigaddset(), SIGINT,
35
SIGQUIT, SIGHUP, SIGTERM,
37
#include <stddef.h> /* NULL, size_t, ssize_t */
38
#include <sys/types.h> /* ssize_t */
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
41
#include <stdio.h> /* fprintf(), stderr, getline(),
42
stdin, feof(), fputc()
44
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
45
EFAULT, EFBIG, EIO, ENOSPC, EINTR
47
#include <error.h> /* error() */
48
#include <iso646.h> /* or, not */
49
#include <stdbool.h> /* bool, false, true */
50
#include <string.h> /* strlen, rindex */
51
#include <argp.h> /* struct argp_option, struct
52
argp_state, struct argp,
53
argp_parse(), error_t,
54
ARGP_KEY_ARG, ARGP_KEY_END,
56
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
57
EX_UNAVAILABLE, EX_IOERR, EX_OK */
59
volatile sig_atomic_t quit_now = 0;
62
const char *argp_program_version = "password-prompt " VERSION;
63
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
65
static void termination_handler(int signum){
70
signal_received = signum;
73
int main(int argc, char **argv){
77
struct termios t_new, t_old;
80
int status = EXIT_SUCCESS;
81
struct sigaction old_action,
82
new_action = { .sa_handler = termination_handler,
85
struct argp_option options[] = {
86
{ .name = "prefix", .key = 'p',
87
.arg = "PREFIX", .flags = 0,
88
.doc = "Prefix shown before the prompt", .group = 2 },
89
{ .name = "debug", .key = 128,
90
.doc = "Debug mode", .group = 3 },
92
* These reproduce what we would get without ARGP_NO_HELP
94
{ .name = "help", .key = '?',
95
.doc = "Give this help list", .group = -1 },
96
{ .name = "usage", .key = -3,
97
.doc = "Give a short usage message", .group = -1 },
98
{ .name = "version", .key = 'V',
99
.doc = "Print program version", .group = -1 },
103
error_t parse_opt (int key, char *arg, struct argp_state *state){
113
* These reproduce what we would get without ARGP_NO_HELP
115
case '?': /* --help */
116
argp_state_help(state, state->out_stream,
117
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
118
& ~(unsigned int)ARGP_HELP_EXIT_OK);
119
case -3: /* --usage */
120
argp_state_help(state, state->out_stream,
121
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
122
case 'V': /* --version */
123
fprintf(state->out_stream, "%s\n", argp_program_version);
124
exit(argp_err_exit_status);
127
return ARGP_ERR_UNKNOWN;
132
struct argp argp = { .options = options, .parser = parse_opt,
134
.doc = "Mandos password-prompt -- Read and"
135
" output a password" };
136
ret = argp_parse(&argp, argc, argv,
137
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
144
error(0, errno, "argp_parse");
152
fprintf(stderr, "Starting %s\n", argv[0]);
155
fprintf(stderr, "Storing current terminal attributes\n");
158
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
160
error(0, errno, "tcgetattr");
164
return EX_UNAVAILABLE;
170
sigemptyset(&new_action.sa_mask);
171
ret = sigaddset(&new_action.sa_mask, SIGINT);
173
error(0, errno, "sigaddset");
176
ret = sigaddset(&new_action.sa_mask, SIGHUP);
178
error(0, errno, "sigaddset");
181
ret = sigaddset(&new_action.sa_mask, SIGTERM);
183
error(0, errno, "sigaddset");
186
/* Need to check if the handler is SIG_IGN before handling:
187
| [[info:libc:Initial Signal Actions]] |
188
| [[info:libc:Basic Signal Handling]] |
190
ret = sigaction(SIGINT, NULL, &old_action);
192
error(0, errno, "sigaction");
195
if(old_action.sa_handler != SIG_IGN){
196
ret = sigaction(SIGINT, &new_action, NULL);
198
error(0, errno, "sigaction");
202
ret = sigaction(SIGHUP, NULL, &old_action);
204
error(0, errno, "sigaction");
207
if(old_action.sa_handler != SIG_IGN){
208
ret = sigaction(SIGHUP, &new_action, NULL);
210
error(0, errno, "sigaction");
214
ret = sigaction(SIGTERM, NULL, &old_action);
216
error(0, errno, "sigaction");
219
if(old_action.sa_handler != SIG_IGN){
220
ret = sigaction(SIGTERM, &new_action, NULL);
222
error(0, errno, "sigaction");
229
fprintf(stderr, "Removing echo flag from terminal attributes\n");
233
t_new.c_lflag &= ~(tcflag_t)ECHO;
234
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
236
error(0, errno, "tcsetattr-echo");
240
return EX_UNAVAILABLE;
248
fprintf(stderr, "Waiting for input from stdin \n");
253
fprintf(stderr, "Interrupted by signal, exiting.\n");
255
status = EXIT_FAILURE;
260
fprintf(stderr, "%s ", prefix);
263
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
264
const char *crypttarget = getenv("CRYPTTAB_NAME");
265
/* Before cryptsetup 1.1.0~rc2 */
266
if(cryptsource == NULL){
267
cryptsource = getenv("cryptsource");
269
if(crypttarget == NULL){
270
crypttarget = getenv("crypttarget");
272
const char *const prompt1 = "Unlocking the disk";
273
const char *const prompt2 = "Enter passphrase";
274
if(cryptsource == NULL){
275
if(crypttarget == NULL){
276
fprintf(stderr, "%s to unlock the disk: ", prompt2);
278
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
282
if(crypttarget == NULL){
283
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
286
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
287
crypttarget, prompt2);
291
sret = getline(&buffer, &n, stdin);
293
status = EXIT_SUCCESS;
294
/* Make n = data size instead of allocated buffer size */
296
/* Strip final newline */
297
if(n > 0 and buffer[n-1] == '\n'){
298
buffer[n-1] = '\0'; /* not strictly necessary */
303
sret = write(STDOUT_FILENO, buffer + written, n - written);
306
error(0, errno, "write");
318
status = EXIT_FAILURE;
323
written += (size_t)sret;
325
sret = close(STDOUT_FILENO);
328
error(0, errno, "close");
343
if(errno != EINTR and not feof(stdin)){
344
error(0, errno, "getline");
347
status = EX_UNAVAILABLE;
357
/* if(sret == 0), then the only sensible thing to do is to retry to
360
if(debug and not quit_now){
361
/* If quit_now is nonzero, we were interrupted by a signal, and
362
will print that later, so no need to show this too. */
363
fprintf(stderr, "getline() returned 0, retrying.\n");
370
fprintf(stderr, "Restoring terminal attributes\n");
372
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
373
error(0, errno, "tcsetattr+echo");
377
sigemptyset(&old_action.sa_mask);
378
old_action.sa_handler = SIG_DFL;
379
ret = sigaction(signal_received, &old_action, NULL);
381
error(0, errno, "sigaction");
383
raise(signal_received);
387
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
390
if(status == EXIT_SUCCESS or status == EX_OK){
added
removed
plugins.d/password-prompt.c
