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» Revision
237.2.18
(compared to revision 237.7.492)
: plugins.d/password-prompt.c
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- Committer: Teddy Hogeborn
- Date: 2009-01-06 22:51:38 UTC
- mto: (237.4.2 mandos-pipe-ipc) (24.1.122 mandos) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 244.
- Revision ID: teddy@fukt.bsnet.se-20090106225138-0tomnv9w18qlmvnz
* Makefile (mandos.lsm): Also update file name using version number.
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files renamed:
- mandos-ctl => mandos-list
- files modified:
- .bzrignore
added
removed
plugins.d/password-prompt.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Password-prompt - Read a password from the terminal and print it
4
*
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
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.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
3
* Passprompt - Read a password from the terminal and print it
4
*
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
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.
12
*
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
23
* <https://www.fukt.bsnet.se/~teddy/>.
24
24
*/
25
25
26
#define _GNU_SOURCE /* getline(), asprintf() */
26
#define _GNU_SOURCE /* getline() */
27
27
28
#include <termios.h> /* struct termios, tcsetattr(),
28
#include <termios.h> /* struct termios, tcsetattr(),
29
29
TCSAFLUSH, tcgetattr(), ECHO */
30
30
#include <unistd.h> /* struct termios, tcsetattr(),
31
31
STDIN_FILENO, TCSAFLUSH,
32
tcgetattr(), ECHO, readlink() */
32
tcgetattr(), ECHO */
33
33
#include <signal.h> /* sig_atomic_t, raise(), struct
34
34
sigaction, sigemptyset(),
35
35
sigaction(), sigaddset(), SIGINT,
36
SIGQUIT, SIGHUP, SIGTERM,
37
raise() */
36
SIGQUIT, SIGHUP, SIGTERM */
38
37
#include <stddef.h> /* NULL, size_t, ssize_t */
39
#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
40
ssize_t, open() */
38
#include <sys/types.h> /* ssize_t */
41
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
42
getenv(), free() */
43
#include <dirent.h> /* scandir(), alphasort() */
40
getopt_long, getenv() */
44
41
#include <stdio.h> /* fprintf(), stderr, getline(),
45
stdin, feof(), fputc(), vfprintf(),
46
vasprintf() */
47
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
48
EFAULT, EFBIG, EIO, ENOSPC, EINTR
49
*/
50
#include <error.h> /* error() */
42
stdin, feof(), perror(), fputc(),
43
stdout, getopt_long */
44
#include <errno.h> /* errno, EINVAL */
51
45
#include <iso646.h> /* or, not */
52
46
#include <stdbool.h> /* bool, false, true */
53
#include <inttypes.h> /* strtoumax() */
54
#include <sys/stat.h> /* struct stat, lstat(), open() */
55
#include <string.h> /* strlen, rindex, memcmp, strerror()
56
*/
47
#include <string.h> /* strlen, rindex, strncmp, strcmp */
57
48
#include <argp.h> /* struct argp_option, struct
58
49
argp_state, struct argp,
59
50
argp_parse(), error_t,
60
51
ARGP_KEY_ARG, ARGP_KEY_END,
61
52
ARGP_ERR_UNKNOWN */
62
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
63
EX_UNAVAILABLE, EX_IOERR, EX_OK */
64
#include <fcntl.h> /* open() */
65
#include <stdarg.h> /* va_list, va_start(), ... */
66
53
67
volatile sig_atomic_t quit_now = 0;
68
int signal_received;
54
volatile bool quit_now = false;
69
55
bool debug = false;
70
56
const char *argp_program_version = "password-prompt " VERSION;
71
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
73
/* Needed for conflict resolution */
74
const char plymouth_name[] = "plymouthd";
75
76
/* Function to use when printing errors */
77
__attribute__((format (gnu_printf, 3, 4)))
78
void error_plus(int status, int errnum, const char *formatstring,
79
...){
80
va_list ap;
81
char *text;
82
int ret;
83
84
va_start(ap, formatstring);
85
ret = vasprintf(&text, formatstring, ap);
86
if(ret == -1){
87
fprintf(stderr, "Mandos plugin %s: ",
88
program_invocation_short_name);
89
vfprintf(stderr, formatstring, ap);
90
fprintf(stderr, ": %s\n", strerror(errnum));
91
error(status, errno, "vasprintf while printing error");
92
return;
93
}
94
fprintf(stderr, "Mandos plugin ");
95
error(status, errnum, "%s", text);
96
free(text);
97
}
98
99
static void termination_handler(int signum){
100
if(quit_now){
101
return;
102
}
103
quit_now = 1;
104
signal_received = signum;
105
}
106
107
bool conflict_detection(void){
108
109
/* plymouth conflicts with password-prompt since both want to read
110
from the terminal. Password-prompt will exit if it detects
111
plymouth since plymouth performs the same functionality.
112
*/
113
__attribute__((nonnull))
114
int is_plymouth(const struct dirent *proc_entry){
115
int ret;
116
int cl_fd;
117
{
118
uintmax_t proc_id;
119
char *tmp;
120
errno = 0;
121
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
122
123
if(errno != 0 or *tmp != '\0'
124
or proc_id != (uintmax_t)((pid_t)proc_id)){
125
return 0;
126
}
127
}
128
129
char *cmdline_filename;
130
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
131
proc_entry->d_name);
132
if(ret == -1){
133
error_plus(0, errno, "asprintf");
134
return 0;
135
}
136
137
/* Open /proc/<pid>/cmdline */
138
cl_fd = open(cmdline_filename, O_RDONLY);
139
free(cmdline_filename);
140
if(cl_fd == -1){
141
if(errno != ENOENT){
142
error_plus(0, errno, "open");
143
}
144
return 0;
145
}
146
147
char *cmdline = NULL;
148
{
149
size_t cmdline_len = 0;
150
size_t cmdline_allocated = 0;
151
char *tmp;
152
const size_t blocksize = 1024;
153
ssize_t sret;
154
do {
155
/* Allocate more space? */
156
if(cmdline_len + blocksize + 1 > cmdline_allocated){
157
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
158
if(tmp == NULL){
159
error_plus(0, errno, "realloc");
160
free(cmdline);
161
close(cl_fd);
162
return 0;
163
}
164
cmdline = tmp;
165
cmdline_allocated += blocksize;
166
}
167
168
/* Read data */
169
sret = read(cl_fd, cmdline + cmdline_len,
170
cmdline_allocated - cmdline_len);
171
if(sret == -1){
172
error_plus(0, errno, "read");
173
free(cmdline);
174
close(cl_fd);
175
return 0;
176
}
177
cmdline_len += (size_t)sret;
178
} while(sret != 0);
179
ret = close(cl_fd);
180
if(ret == -1){
181
error_plus(0, errno, "close");
182
free(cmdline);
183
return 0;
184
}
185
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
186
}
187
/* we now have cmdline */
188
189
/* get basename */
190
char *cmdline_base = strrchr(cmdline, '/');
191
if(cmdline_base != NULL){
192
cmdline_base += 1; /* skip the slash */
193
} else {
194
cmdline_base = cmdline;
195
}
196
197
if(strcmp(cmdline_base, plymouth_name) != 0){
198
if(debug){
199
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
200
plymouth_name);
201
}
202
free(cmdline);
203
return 0;
204
}
205
if(debug){
206
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
207
plymouth_name);
208
}
209
free(cmdline);
210
return 1;
211
}
212
213
struct dirent **direntries = NULL;
214
int ret;
215
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
216
if(ret == -1){
217
error_plus(1, errno, "scandir");
218
}
219
{
220
int i = ret;
221
while(i--){
222
free(direntries[i]);
223
}
224
}
225
free(direntries);
226
return ret > 0;
227
}
228
57
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
58
59
static void termination_handler(__attribute__((unused))int signum){
60
quit_now = true;
61
}
229
62
230
63
int main(int argc, char **argv){
231
ssize_t sret;
232
int ret;
64
ssize_t ret;
233
65
size_t n;
234
66
struct termios t_new, t_old;
235
67
char *buffer = NULL;
245
77
.doc = "Prefix shown before the prompt", .group = 2 },
246
78
{ .name = "debug", .key = 128,
247
79
.doc = "Debug mode", .group = 3 },
248
/*
249
* These reproduce what we would get without ARGP_NO_HELP
250
*/
251
{ .name = "help", .key = '?',
252
.doc = "Give this help list", .group = -1 },
253
{ .name = "usage", .key = -3,
254
.doc = "Give a short usage message", .group = -1 },
255
{ .name = "version", .key = 'V',
256
.doc = "Print program version", .group = -1 },
257
80
{ .name = NULL }
258
81
};
259
260
__attribute__((nonnull(3)))
261
error_t parse_opt (int key, char *arg, struct argp_state *state){
262
errno = 0;
263
switch (key){
82
83
error_t parse_opt (int key, char *arg, struct argp_state *state) {
84
/* Get the INPUT argument from `argp_parse', which we know is a
85
pointer to our plugin list pointer. */
86
switch (key) {
264
87
case 'p':
265
88
prefix = arg;
266
89
break;
267
90
case 128:
268
91
debug = true;
269
92
break;
270
/*
271
* These reproduce what we would get without ARGP_NO_HELP
272
*/
273
case '?': /* --help */
274
argp_state_help(state, state->out_stream,
275
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
276
& ~(unsigned int)ARGP_HELP_EXIT_OK);
277
case -3: /* --usage */
278
argp_state_help(state, state->out_stream,
279
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
280
case 'V': /* --version */
281
fprintf(state->out_stream, "%s\n", argp_program_version);
282
exit(argp_err_exit_status);
93
case ARGP_KEY_ARG:
94
argp_usage (state);
95
break;
96
case ARGP_KEY_END:
283
97
break;
284
98
default:
285
99
return ARGP_ERR_UNKNOWN;
286
100
}
287
return errno;
101
return 0;
288
102
}
289
103
290
104
struct argp argp = { .options = options, .parser = parse_opt,
291
105
.args_doc = "",
292
106
.doc = "Mandos password-prompt -- Read and"
293
107
" output a password" };
294
ret = argp_parse(&argp, argc, argv,
295
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
296
switch(ret){
297
case 0:
298
break;
299
case ENOMEM:
300
default:
301
errno = ret;
302
error_plus(0, errno, "argp_parse");
303
return EX_OSERR;
304
case EINVAL:
305
return EX_USAGE;
108
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
109
if (ret == ARGP_ERR_UNKNOWN){
110
fprintf(stderr, "Unknown error while parsing arguments\n");
111
return EXIT_FAILURE;
306
112
}
307
113
}
308
309
if(debug){
114
115
if (debug){
310
116
fprintf(stderr, "Starting %s\n", argv[0]);
311
117
}
312
313
if(conflict_detection()){
314
if(debug){
315
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
316
}
317
return EXIT_FAILURE;
318
}
319
320
if(debug){
118
if (debug){
321
119
fprintf(stderr, "Storing current terminal attributes\n");
322
120
}
323
121
324
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
325
int e = errno;
326
error_plus(0, errno, "tcgetattr");
327
switch(e){
328
case EBADF:
329
case ENOTTY:
330
return EX_UNAVAILABLE;
331
default:
332
return EX_OSERR;
333
}
122
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
123
perror("tcgetattr");
124
return EXIT_FAILURE;
334
125
}
335
126
336
127
sigemptyset(&new_action.sa_mask);
337
ret = sigaddset(&new_action.sa_mask, SIGINT);
338
if(ret == -1){
339
error_plus(0, errno, "sigaddset");
340
return EX_OSERR;
341
}
342
ret = sigaddset(&new_action.sa_mask, SIGHUP);
343
if(ret == -1){
344
error_plus(0, errno, "sigaddset");
345
return EX_OSERR;
346
}
347
ret = sigaddset(&new_action.sa_mask, SIGTERM);
348
if(ret == -1){
349
error_plus(0, errno, "sigaddset");
350
return EX_OSERR;
351
}
352
/* Need to check if the handler is SIG_IGN before handling:
353
| [[info:libc:Initial Signal Actions]] |
354
| [[info:libc:Basic Signal Handling]] |
355
*/
128
sigaddset(&new_action.sa_mask, SIGINT);
129
sigaddset(&new_action.sa_mask, SIGHUP);
130
sigaddset(&new_action.sa_mask, SIGTERM);
356
131
ret = sigaction(SIGINT, NULL, &old_action);
357
132
if(ret == -1){
358
error_plus(0, errno, "sigaction");
359
return EX_OSERR;
133
perror("sigaction");
134
return EXIT_FAILURE;
360
135
}
361
if(old_action.sa_handler != SIG_IGN){
136
if (old_action.sa_handler != SIG_IGN){
362
137
ret = sigaction(SIGINT, &new_action, NULL);
363
138
if(ret == -1){
364
error_plus(0, errno, "sigaction");
365
return EX_OSERR;
139
perror("sigaction");
140
return EXIT_FAILURE;
366
141
}
367
142
}
368
143
ret = sigaction(SIGHUP, NULL, &old_action);
369
144
if(ret == -1){
370
error_plus(0, errno, "sigaction");
371
return EX_OSERR;
145
perror("sigaction");
146
return EXIT_FAILURE;
372
147
}
373
if(old_action.sa_handler != SIG_IGN){
148
if (old_action.sa_handler != SIG_IGN){
374
149
ret = sigaction(SIGHUP, &new_action, NULL);
375
150
if(ret == -1){
376
error_plus(0, errno, "sigaction");
377
return EX_OSERR;
151
perror("sigaction");
152
return EXIT_FAILURE;
378
153
}
379
154
}
380
155
ret = sigaction(SIGTERM, NULL, &old_action);
381
156
if(ret == -1){
382
error_plus(0, errno, "sigaction");
383
return EX_OSERR;
157
perror("sigaction");
158
return EXIT_FAILURE;
384
159
}
385
if(old_action.sa_handler != SIG_IGN){
160
if (old_action.sa_handler != SIG_IGN){
386
161
ret = sigaction(SIGTERM, &new_action, NULL);
387
162
if(ret == -1){
388
error_plus(0, errno, "sigaction");
389
return EX_OSERR;
163
perror("sigaction");
164
return EXIT_FAILURE;
390
165
}
391
166
}
392
167
393
168
394
if(debug){
169
if (debug){
395
170
fprintf(stderr, "Removing echo flag from terminal attributes\n");
396
171
}
397
172
398
173
t_new = t_old;
399
t_new.c_lflag &= ~(tcflag_t)ECHO;
400
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
401
int e = errno;
402
error_plus(0, errno, "tcsetattr-echo");
403
switch(e){
404
case EBADF:
405
case ENOTTY:
406
return EX_UNAVAILABLE;
407
case EINVAL:
408
default:
409
return EX_OSERR;
410
}
174
t_new.c_lflag &= ~ECHO;
175
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
176
perror("tcsetattr-echo");
177
return EXIT_FAILURE;
411
178
}
412
413
if(debug){
179
180
if (debug){
414
181
fprintf(stderr, "Waiting for input from stdin \n");
415
182
}
416
183
while(true){
417
if(quit_now){
184
if (quit_now){
418
185
if(debug){
419
186
fprintf(stderr, "Interrupted by signal, exiting.\n");
420
187
}
426
193
fprintf(stderr, "%s ", prefix);
427
194
}
428
195
{
429
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
430
const char *crypttarget = getenv("CRYPTTAB_NAME");
431
/* Before cryptsetup 1.1.0~rc2 */
432
if(cryptsource == NULL){
433
cryptsource = getenv("cryptsource");
434
}
435
if(crypttarget == NULL){
436
crypttarget = getenv("crypttarget");
437
}
438
const char *const prompt1 = "Unlocking the disk";
439
const char *const prompt2 = "Enter passphrase";
196
const char *cryptsource = getenv("cryptsource");
197
const char *crypttarget = getenv("crypttarget");
198
const char *const prompt
199
= "Enter passphrase to unlock the disk";
440
200
if(cryptsource == NULL){
441
201
if(crypttarget == NULL){
442
fprintf(stderr, "%s to unlock the disk: ", prompt2);
202
fprintf(stderr, "%s: ", prompt);
443
203
} else {
444
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
445
prompt2);
204
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
446
205
}
447
206
} else {
448
207
if(crypttarget == NULL){
449
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
450
prompt2);
208
fprintf(stderr, "%s %s: ", prompt, cryptsource);
451
209
} else {
452
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
453
crypttarget, prompt2);
210
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
211
crypttarget);
454
212
}
455
213
}
456
214
}
457
sret = getline(&buffer, &n, stdin);
458
if(sret > 0){
215
ret = getline(&buffer, &n, stdin);
216
if (ret > 0){
459
217
status = EXIT_SUCCESS;
460
218
/* Make n = data size instead of allocated buffer size */
461
n = (size_t)sret;
219
n = (size_t)ret;
462
220
/* Strip final newline */
463
if(n > 0 and buffer[n-1] == '\n'){
221
if(n>0 and buffer[n-1] == '\n'){
464
222
buffer[n-1] = '\0'; /* not strictly necessary */
465
223
n--;
466
224
}
467
225
size_t written = 0;
468
226
while(written < n){
469
sret = write(STDOUT_FILENO, buffer + written, n - written);
470
if(sret < 0){
471
int e = errno;
472
error_plus(0, errno, "write");
473
switch(e){
474
case EBADF:
475
case EFAULT:
476
case EINVAL:
477
case EFBIG:
478
case EIO:
479
case ENOSPC:
480
default:
481
status = EX_IOERR;
482
break;
483
case EINTR:
484
status = EXIT_FAILURE;
485
break;
486
}
487
break;
488
}
489
written += (size_t)sret;
490
}
491
sret = close(STDOUT_FILENO);
492
if(sret == -1){
493
int e = errno;
494
error_plus(0, errno, "close");
495
switch(e){
496
case EBADF:
497
status = EX_OSFILE;
498
break;
499
case EIO:
500
default:
501
status = EX_IOERR;
502
break;
503
}
227
ret = write(STDOUT_FILENO, buffer + written, n - written);
228
if(ret < 0){
229
perror("write");
230
status = EXIT_FAILURE;
231
break;
232
}
233
written += (size_t)ret;
504
234
}
505
235
break;
506
236
}
507
if(sret < 0){
508
int e = errno;
509
if(errno != EINTR and not feof(stdin)){
510
error_plus(0, errno, "getline");
511
switch(e){
512
case EBADF:
513
status = EX_UNAVAILABLE;
514
break;
515
case EIO:
516
case EINVAL:
517
default:
518
status = EX_IOERR;
519
break;
520
}
237
if (ret < 0){
238
if (errno != EINTR and not feof(stdin)){
239
perror("getline");
240
status = EXIT_FAILURE;
521
241
break;
522
242
}
523
243
}
524
/* if(sret == 0), then the only sensible thing to do is to retry
525
to read from stdin */
244
/* if(ret == 0), then the only sensible thing to do is to retry to
245
read from stdin */
526
246
fputc('\n', stderr);
527
247
if(debug and not quit_now){
528
/* If quit_now is nonzero, we were interrupted by a signal, and
248
/* If quit_now is true, we were interrupted by a signal, and
529
249
will print that later, so no need to show this too. */
530
250
fprintf(stderr, "getline() returned 0, retrying.\n");
531
251
}
532
252
}
533
253
534
254
free(buffer);
535
255
536
if(debug){
256
if (debug){
537
257
fprintf(stderr, "Restoring terminal attributes\n");
538
258
}
539
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
540
error_plus(0, errno, "tcsetattr+echo");
541
}
542
543
if(quit_now){
544
sigemptyset(&old_action.sa_mask);
545
old_action.sa_handler = SIG_DFL;
546
ret = sigaction(signal_received, &old_action, NULL);
547
if(ret == -1){
548
error_plus(0, errno, "sigaction");
549
}
550
raise(signal_received);
551
}
552
553
if(debug){
259
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
260
perror("tcsetattr+echo");
261
}
262
263
if (debug){
554
264
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
555
265
status);
556
266
}
557
if(status == EXIT_SUCCESS or status == EX_OK){
267
if(status == EXIT_SUCCESS){
558
268
fputc('\n', stderr);
559
269
}
560
270
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0