3
3
* Password-prompt - Read a password from the terminal and print 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 © 2008-2019 Teddy Hogeborn
6
* Copyright © 2008-2019 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>.
27
28
#include <termios.h> /* struct termios, tcsetattr(),
28
29
TCSAFLUSH, tcgetattr(), ECHO */
29
#include <unistd.h> /* struct termios, tcsetattr(),
30
STDIN_FILENO, TCSAFLUSH,
31
tcgetattr(), ECHO, readlink() */
30
#include <unistd.h> /* access(), struct termios,
31
tcsetattr(), STDIN_FILENO,
32
TCSAFLUSH, tcgetattr(), ECHO,
32
34
#include <signal.h> /* sig_atomic_t, raise(), struct
33
35
sigaction, sigemptyset(),
34
36
sigaction(), sigaddset(), SIGINT,
73
75
const char plymouth_name[] = "plymouthd";
75
77
/* Function to use when printing errors */
78
__attribute__((format (gnu_printf, 3, 4)))
76
79
void error_plus(int status, int errnum, const char *formatstring,
82
85
va_start(ap, formatstring);
83
86
ret = vasprintf(&text, formatstring, ap);
85
88
fprintf(stderr, "Mandos plugin %s: ",
86
89
program_invocation_short_name);
87
90
vfprintf(stderr, formatstring, ap);
88
fprintf(stderr, ": ");
89
fprintf(stderr, "%s\n", strerror(errnum));
91
fprintf(stderr, ": %s\n", strerror(errnum));
90
92
error(status, errno, "vasprintf while printing error");
109
111
from the terminal. Password-prompt will exit if it detects
110
112
plymouth since plymouth performs the same functionality.
114
if(access("/run/plymouth/pid", R_OK) == 0){
118
__attribute__((nonnull))
112
119
int is_plymouth(const struct dirent *proc_entry){
119
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
126
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
121
128
if(errno != 0 or *tmp != '\0'
122
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
129
or proc_id != (uintmax_t)((pid_t)proc_id)){
128
135
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
129
136
proc_entry->d_name);
131
error(0, errno, "asprintf");
138
error_plus(0, errno, "asprintf");
154
161
if(cmdline_len + blocksize + 1 > cmdline_allocated){
155
162
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
157
error(0, errno, "realloc");
164
error_plus(0, errno, "realloc");
167
174
sret = read(cl_fd, cmdline + cmdline_len,
168
175
cmdline_allocated - cmdline_len);
170
error(0, errno, "read");
177
error_plus(0, errno, "read");
211
218
struct dirent **direntries = NULL;
213
220
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
215
error(1, errno, "scandir");
222
error_plus(1, errno, "scandir");
217
230
free(direntries);
226
239
struct termios t_new, t_old;
227
240
char *buffer = NULL;
228
241
char *prefix = NULL;
229
243
int status = EXIT_SUCCESS;
230
244
struct sigaction old_action,
231
245
new_action = { .sa_handler = termination_handler,
235
249
{ .name = "prefix", .key = 'p',
236
250
.arg = "PREFIX", .flags = 0,
237
251
.doc = "Prefix shown before the prompt", .group = 2 },
252
{ .name = "prompt", .key = 129,
253
.arg = "PROMPT", .flags = 0,
254
.doc = "The prompt to show", .group = 2 },
238
255
{ .name = "debug", .key = 128,
239
256
.doc = "Debug mode", .group = 3 },
265
286
argp_state_help(state, state->out_stream,
266
287
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
267
288
& ~(unsigned int)ARGP_HELP_EXIT_OK);
289
__builtin_unreachable();
268
290
case -3: /* --usage */
269
291
argp_state_help(state, state->out_stream,
270
292
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
293
__builtin_unreachable();
271
294
case 'V': /* --version */
272
295
fprintf(state->out_stream, "%s\n", argp_program_version);
273
296
exit(argp_err_exit_status);
301
324
fprintf(stderr, "Starting %s\n", argv[0]);
304
if (conflict_detection()){
327
if(conflict_detection()){
306
329
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
315
338
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
317
error(0, errno, "tcgetattr");
340
error_plus(0, errno, "tcgetattr");
327
350
sigemptyset(&new_action.sa_mask);
328
351
ret = sigaddset(&new_action.sa_mask, SIGINT);
330
error(0, errno, "sigaddset");
353
error_plus(0, errno, "sigaddset");
333
356
ret = sigaddset(&new_action.sa_mask, SIGHUP);
335
error(0, errno, "sigaddset");
358
error_plus(0, errno, "sigaddset");
338
361
ret = sigaddset(&new_action.sa_mask, SIGTERM);
340
error(0, errno, "sigaddset");
363
error_plus(0, errno, "sigaddset");
343
366
/* Need to check if the handler is SIG_IGN before handling:
347
370
ret = sigaction(SIGINT, NULL, &old_action);
349
error(0, errno, "sigaction");
372
error_plus(0, errno, "sigaction");
352
375
if(old_action.sa_handler != SIG_IGN){
353
376
ret = sigaction(SIGINT, &new_action, NULL);
355
error(0, errno, "sigaction");
378
error_plus(0, errno, "sigaction");
359
382
ret = sigaction(SIGHUP, NULL, &old_action);
361
error(0, errno, "sigaction");
384
error_plus(0, errno, "sigaction");
364
387
if(old_action.sa_handler != SIG_IGN){
365
388
ret = sigaction(SIGHUP, &new_action, NULL);
367
error(0, errno, "sigaction");
390
error_plus(0, errno, "sigaction");
371
394
ret = sigaction(SIGTERM, NULL, &old_action);
373
error(0, errno, "sigaction");
396
error_plus(0, errno, "sigaction");
376
399
if(old_action.sa_handler != SIG_IGN){
377
400
ret = sigaction(SIGTERM, &new_action, NULL);
379
error(0, errno, "sigaction");
402
error_plus(0, errno, "sigaction");
390
413
t_new.c_lflag &= ~(tcflag_t)ECHO;
391
414
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
393
error(0, errno, "tcsetattr-echo");
416
error_plus(0, errno, "tcsetattr-echo");
417
440
fprintf(stderr, "%s ", prefix);
443
fprintf(stderr, "%s: ", prompt);
420
445
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
421
446
const char *crypttarget = getenv("CRYPTTAB_NAME");
422
447
/* Before cryptsetup 1.1.0~rc2 */
460
485
sret = write(STDOUT_FILENO, buffer + written, n - written);
463
error(0, errno, "write");
488
error_plus(0, errno, "write");
482
507
sret = close(STDOUT_FILENO);
485
error(0, errno, "close");
510
error_plus(0, errno, "close");
488
513
status = EX_OSFILE;
500
if(errno != EINTR and not feof(stdin)){
501
error(0, errno, "getline");
504
status = EX_UNAVAILABLE;
527
error_plus(0, errno, "getline");
530
status = EX_UNAVAILABLE;
514
544
/* if(sret == 0), then the only sensible thing to do is to retry
527
557
fprintf(stderr, "Restoring terminal attributes\n");
529
559
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
530
error(0, errno, "tcsetattr+echo");
560
error_plus(0, errno, "tcsetattr+echo");
535
565
old_action.sa_handler = SIG_DFL;
536
566
ret = sigaction(signal_received, &old_action, NULL);
538
error(0, errno, "sigaction");
568
error_plus(0, errno, "sigaction");
540
570
raise(signal_received);
added
removed
plugins.d/password-prompt.c
