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» Revision
24.1.143
(compared to revision 237.7.769)
: plugins.d/password-prompt.c
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- Committer: Björn Påhlsson
- Date: 2009-09-21 21:57:23 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@braxen-20090921215723-no1445t10clzl0e1
added documentation todo
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/tests
- debian/upstream
- dracut-module
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/password-prompt.c
2
2
/*
3
3
* Password-prompt - Read a password from the terminal and print it
4
4
*
5
* Copyright © 2008-2019 Teddy Hogeborn
6
* Copyright © 2008-2019 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
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 <mandos@fukt.bsnet.se>.
24
23
*/
25
24
26
#define _GNU_SOURCE /* getline(), asprintf() */
25
#define _GNU_SOURCE /* getline() */
27
26
28
#include <termios.h> /* struct termios, tcsetattr(),
27
#include <termios.h> /* struct termios, tcsetattr(),
29
28
TCSAFLUSH, tcgetattr(), ECHO */
30
#include <unistd.h> /* access(), struct termios,
31
tcsetattr(), STDIN_FILENO,
32
TCSAFLUSH, tcgetattr(), ECHO,
33
readlink() */
29
#include <unistd.h> /* struct termios, tcsetattr(),
30
STDIN_FILENO, TCSAFLUSH,
31
tcgetattr(), ECHO */
34
32
#include <signal.h> /* sig_atomic_t, raise(), struct
35
33
sigaction, sigemptyset(),
36
34
sigaction(), sigaddset(), SIGINT,
37
35
SIGQUIT, SIGHUP, SIGTERM,
38
36
raise() */
39
37
#include <stddef.h> /* NULL, size_t, ssize_t */
40
#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
41
ssize_t, open() */
38
#include <sys/types.h> /* ssize_t */
42
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
43
getenv(), free() */
44
#include <dirent.h> /* scandir(), alphasort() */
40
getopt_long, getenv() */
45
41
#include <stdio.h> /* fprintf(), stderr, getline(),
46
stdin, feof(), fputc(), vfprintf(),
47
vasprintf() */
48
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
49
EFAULT, EFBIG, EIO, ENOSPC, EINTR
50
*/
51
#include <error.h> /* error() */
42
stdin, feof(), perror(), fputc(),
43
stdout, getopt_long */
44
#include <errno.h> /* errno, EINVAL */
52
45
#include <iso646.h> /* or, not */
53
46
#include <stdbool.h> /* bool, false, true */
54
#include <inttypes.h> /* strtoumax() */
55
#include <sys/stat.h> /* struct stat, lstat(), open() */
56
#include <string.h> /* strlen, rindex, memcmp, strerror()
57
*/
47
#include <string.h> /* strlen, rindex */
58
48
#include <argp.h> /* struct argp_option, struct
59
49
argp_state, struct argp,
60
50
argp_parse(), error_t,
61
51
ARGP_KEY_ARG, ARGP_KEY_END,
62
52
ARGP_ERR_UNKNOWN */
63
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
64
EX_UNAVAILABLE, EX_IOERR, EX_OK */
65
#include <fcntl.h> /* open() */
66
#include <stdarg.h> /* va_list, va_start(), ... */
67
53
68
54
volatile sig_atomic_t quit_now = 0;
69
55
int signal_received;
70
56
bool debug = false;
71
57
const char *argp_program_version = "password-prompt " VERSION;
72
const char *argp_program_bug_address = "<mandos@recompile.se>";
73
74
/* Needed for conflict resolution */
75
const char plymouth_name[] = "plymouthd";
76
77
/* Function to use when printing errors */
78
__attribute__((format (gnu_printf, 3, 4)))
79
void error_plus(int status, int errnum, const char *formatstring,
80
...){
81
va_list ap;
82
char *text;
83
int ret;
84
85
va_start(ap, formatstring);
86
ret = vasprintf(&text, formatstring, ap);
87
if(ret == -1){
88
fprintf(stderr, "Mandos plugin %s: ",
89
program_invocation_short_name);
90
vfprintf(stderr, formatstring, ap);
91
fprintf(stderr, ": %s\n", strerror(errnum));
92
error(status, errno, "vasprintf while printing error");
93
return;
94
}
95
fprintf(stderr, "Mandos plugin ");
96
error(status, errnum, "%s", text);
97
free(text);
98
}
58
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
99
59
100
60
static void termination_handler(int signum){
101
61
if(quit_now){
105
65
signal_received = signum;
106
66
}
107
67
108
bool conflict_detection(void){
109
110
/* plymouth conflicts with password-prompt since both want to read
111
from the terminal. Password-prompt will exit if it detects
112
plymouth since plymouth performs the same functionality.
113
*/
114
if(access("/run/plymouth/pid", R_OK) == 0){
115
return true;
116
}
117
118
__attribute__((nonnull))
119
int is_plymouth(const struct dirent *proc_entry){
120
int ret;
121
int cl_fd;
122
{
123
uintmax_t proc_id;
124
char *tmp;
125
errno = 0;
126
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
127
128
if(errno != 0 or *tmp != '\0'
129
or proc_id != (uintmax_t)((pid_t)proc_id)){
130
return 0;
131
}
132
}
133
134
char *cmdline_filename;
135
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
136
proc_entry->d_name);
137
if(ret == -1){
138
error_plus(0, errno, "asprintf");
139
return 0;
140
}
141
142
/* Open /proc/<pid>/cmdline */
143
cl_fd = open(cmdline_filename, O_RDONLY);
144
free(cmdline_filename);
145
if(cl_fd == -1){
146
if(errno != ENOENT){
147
error_plus(0, errno, "open");
148
}
149
return 0;
150
}
151
152
char *cmdline = NULL;
153
{
154
size_t cmdline_len = 0;
155
size_t cmdline_allocated = 0;
156
char *tmp;
157
const size_t blocksize = 1024;
158
ssize_t sret;
159
do {
160
/* Allocate more space? */
161
if(cmdline_len + blocksize + 1 > cmdline_allocated){
162
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
163
if(tmp == NULL){
164
error_plus(0, errno, "realloc");
165
free(cmdline);
166
close(cl_fd);
167
return 0;
168
}
169
cmdline = tmp;
170
cmdline_allocated += blocksize;
171
}
172
173
/* Read data */
174
sret = read(cl_fd, cmdline + cmdline_len,
175
cmdline_allocated - cmdline_len);
176
if(sret == -1){
177
error_plus(0, errno, "read");
178
free(cmdline);
179
close(cl_fd);
180
return 0;
181
}
182
cmdline_len += (size_t)sret;
183
} while(sret != 0);
184
ret = close(cl_fd);
185
if(ret == -1){
186
error_plus(0, errno, "close");
187
free(cmdline);
188
return 0;
189
}
190
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
191
}
192
/* we now have cmdline */
193
194
/* get basename */
195
char *cmdline_base = strrchr(cmdline, '/');
196
if(cmdline_base != NULL){
197
cmdline_base += 1; /* skip the slash */
198
} else {
199
cmdline_base = cmdline;
200
}
201
202
if(strcmp(cmdline_base, plymouth_name) != 0){
203
if(debug){
204
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
205
plymouth_name);
206
}
207
free(cmdline);
208
return 0;
209
}
210
if(debug){
211
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
212
plymouth_name);
213
}
214
free(cmdline);
215
return 1;
216
}
217
218
struct dirent **direntries = NULL;
219
int ret;
220
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
221
if(ret == -1){
222
error_plus(1, errno, "scandir");
223
}
224
{
225
int i = ret;
226
while(i--){
227
free(direntries[i]);
228
}
229
}
230
free(direntries);
231
return ret > 0;
232
}
233
234
235
68
int main(int argc, char **argv){
236
ssize_t sret;
237
int ret;
69
ssize_t ret;
238
70
size_t n;
239
71
struct termios t_new, t_old;
240
72
char *buffer = NULL;
241
73
char *prefix = NULL;
242
char *prompt = NULL;
243
74
int status = EXIT_SUCCESS;
244
75
struct sigaction old_action,
245
76
new_action = { .sa_handler = termination_handler,
249
80
{ .name = "prefix", .key = 'p',
250
81
.arg = "PREFIX", .flags = 0,
251
82
.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 },
255
83
{ .name = "debug", .key = 128,
256
84
.doc = "Debug mode", .group = 3 },
257
/*
258
* These reproduce what we would get without ARGP_NO_HELP
259
*/
260
{ .name = "help", .key = '?',
261
.doc = "Give this help list", .group = -1 },
262
{ .name = "usage", .key = -3,
263
.doc = "Give a short usage message", .group = -1 },
264
{ .name = "version", .key = 'V',
265
.doc = "Print program version", .group = -1 },
266
85
{ .name = NULL }
267
86
};
268
87
269
__attribute__((nonnull(3)))
270
88
error_t parse_opt (int key, char *arg, struct argp_state *state){
271
errno = 0;
272
89
switch (key){
273
case 'p': /* --prefix */
90
case 'p':
274
91
prefix = arg;
275
92
break;
276
case 128: /* --debug */
93
case 128:
277
94
debug = true;
278
95
break;
279
case 129: /* --prompt */
280
prompt = arg;
96
case ARGP_KEY_ARG:
97
argp_usage(state);
281
98
break;
282
/*
283
* These reproduce what we would get without ARGP_NO_HELP
284
*/
285
case '?': /* --help */
286
argp_state_help(state, state->out_stream,
287
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
288
& ~(unsigned int)ARGP_HELP_EXIT_OK);
289
__builtin_unreachable();
290
case -3: /* --usage */
291
argp_state_help(state, state->out_stream,
292
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
293
__builtin_unreachable();
294
case 'V': /* --version */
295
fprintf(state->out_stream, "%s\n", argp_program_version);
296
exit(argp_err_exit_status);
99
case ARGP_KEY_END:
297
100
break;
298
101
default:
299
102
return ARGP_ERR_UNKNOWN;
300
103
}
301
return errno;
104
return 0;
302
105
}
303
106
304
107
struct argp argp = { .options = options, .parser = parse_opt,
305
108
.args_doc = "",
306
109
.doc = "Mandos password-prompt -- Read and"
307
110
" output a password" };
308
ret = argp_parse(&argp, argc, argv,
309
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
310
switch(ret){
311
case 0:
312
break;
313
case ENOMEM:
314
default:
315
errno = ret;
316
error_plus(0, errno, "argp_parse");
317
return EX_OSERR;
318
case EINVAL:
319
return EX_USAGE;
111
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
112
if(ret == ARGP_ERR_UNKNOWN){
113
fprintf(stderr, "Unknown error while parsing arguments\n");
114
return EXIT_FAILURE;
320
115
}
321
116
}
322
117
323
118
if(debug){
324
119
fprintf(stderr, "Starting %s\n", argv[0]);
325
120
}
326
327
if(conflict_detection()){
328
if(debug){
329
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
330
}
331
return EXIT_FAILURE;
332
}
333
334
121
if(debug){
335
122
fprintf(stderr, "Storing current terminal attributes\n");
336
123
}
337
124
338
125
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
339
int e = errno;
340
error_plus(0, errno, "tcgetattr");
341
switch(e){
342
case EBADF:
343
case ENOTTY:
344
return EX_UNAVAILABLE;
345
default:
346
return EX_OSERR;
347
}
126
perror("tcgetattr");
127
return EXIT_FAILURE;
348
128
}
349
129
350
130
sigemptyset(&new_action.sa_mask);
351
131
ret = sigaddset(&new_action.sa_mask, SIGINT);
352
132
if(ret == -1){
353
error_plus(0, errno, "sigaddset");
354
return EX_OSERR;
133
perror("sigaddset");
134
return EXIT_FAILURE;
355
135
}
356
136
ret = sigaddset(&new_action.sa_mask, SIGHUP);
357
137
if(ret == -1){
358
error_plus(0, errno, "sigaddset");
359
return EX_OSERR;
138
perror("sigaddset");
139
return EXIT_FAILURE;
360
140
}
361
141
ret = sigaddset(&new_action.sa_mask, SIGTERM);
362
142
if(ret == -1){
363
error_plus(0, errno, "sigaddset");
364
return EX_OSERR;
143
perror("sigaddset");
144
return EXIT_FAILURE;
365
145
}
366
146
/* Need to check if the handler is SIG_IGN before handling:
367
147
| [[info:libc:Initial Signal Actions]] |
369
149
*/
370
150
ret = sigaction(SIGINT, NULL, &old_action);
371
151
if(ret == -1){
372
error_plus(0, errno, "sigaction");
373
return EX_OSERR;
152
perror("sigaction");
153
return EXIT_FAILURE;
374
154
}
375
155
if(old_action.sa_handler != SIG_IGN){
376
156
ret = sigaction(SIGINT, &new_action, NULL);
377
157
if(ret == -1){
378
error_plus(0, errno, "sigaction");
379
return EX_OSERR;
158
perror("sigaction");
159
return EXIT_FAILURE;
380
160
}
381
161
}
382
162
ret = sigaction(SIGHUP, NULL, &old_action);
383
163
if(ret == -1){
384
error_plus(0, errno, "sigaction");
385
return EX_OSERR;
164
perror("sigaction");
165
return EXIT_FAILURE;
386
166
}
387
167
if(old_action.sa_handler != SIG_IGN){
388
168
ret = sigaction(SIGHUP, &new_action, NULL);
389
169
if(ret == -1){
390
error_plus(0, errno, "sigaction");
391
return EX_OSERR;
170
perror("sigaction");
171
return EXIT_FAILURE;
392
172
}
393
173
}
394
174
ret = sigaction(SIGTERM, NULL, &old_action);
395
175
if(ret == -1){
396
error_plus(0, errno, "sigaction");
397
return EX_OSERR;
176
perror("sigaction");
177
return EXIT_FAILURE;
398
178
}
399
179
if(old_action.sa_handler != SIG_IGN){
400
180
ret = sigaction(SIGTERM, &new_action, NULL);
401
181
if(ret == -1){
402
error_plus(0, errno, "sigaction");
403
return EX_OSERR;
182
perror("sigaction");
183
return EXIT_FAILURE;
404
184
}
405
185
}
406
186
412
192
t_new = t_old;
413
193
t_new.c_lflag &= ~(tcflag_t)ECHO;
414
194
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
415
int e = errno;
416
error_plus(0, errno, "tcsetattr-echo");
417
switch(e){
418
case EBADF:
419
case ENOTTY:
420
return EX_UNAVAILABLE;
421
case EINVAL:
422
default:
423
return EX_OSERR;
424
}
195
perror("tcsetattr-echo");
196
return EXIT_FAILURE;
425
197
}
426
198
427
199
if(debug){
428
200
fprintf(stderr, "Waiting for input from stdin \n");
429
201
}
439
211
if(prefix){
440
212
fprintf(stderr, "%s ", prefix);
441
213
}
442
if(prompt != NULL){
443
fprintf(stderr, "%s: ", prompt);
444
} else {
445
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
446
const char *crypttarget = getenv("CRYPTTAB_NAME");
447
/* Before cryptsetup 1.1.0~rc2 */
448
if(cryptsource == NULL){
449
cryptsource = getenv("cryptsource");
450
}
451
if(crypttarget == NULL){
452
crypttarget = getenv("crypttarget");
453
}
454
const char *const prompt1 = "Unlocking the disk";
455
const char *const prompt2 = "Enter passphrase";
214
{
215
const char *cryptsource = getenv("cryptsource");
216
const char *crypttarget = getenv("crypttarget");
217
const char *const prompt
218
= "Enter passphrase to unlock the disk";
456
219
if(cryptsource == NULL){
457
220
if(crypttarget == NULL){
458
fprintf(stderr, "%s to unlock the disk: ", prompt2);
221
fprintf(stderr, "%s: ", prompt);
459
222
} else {
460
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
461
prompt2);
223
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
462
224
}
463
225
} else {
464
226
if(crypttarget == NULL){
465
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
466
prompt2);
227
fprintf(stderr, "%s %s: ", prompt, cryptsource);
467
228
} else {
468
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
469
crypttarget, prompt2);
229
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
230
crypttarget);
470
231
}
471
232
}
472
233
}
473
sret = getline(&buffer, &n, stdin);
474
if(sret > 0){
234
ret = getline(&buffer, &n, stdin);
235
if(ret > 0){
475
236
status = EXIT_SUCCESS;
476
237
/* Make n = data size instead of allocated buffer size */
477
n = (size_t)sret;
238
n = (size_t)ret;
478
239
/* Strip final newline */
479
if(n > 0 and buffer[n-1] == '\n'){
240
if(n>0 and buffer[n-1] == '\n'){
480
241
buffer[n-1] = '\0'; /* not strictly necessary */
481
242
n--;
482
243
}
483
244
size_t written = 0;
484
245
while(written < n){
485
sret = write(STDOUT_FILENO, buffer + written, n - written);
486
if(sret < 0){
487
int e = errno;
488
error_plus(0, errno, "write");
489
switch(e){
490
case EBADF:
491
case EFAULT:
492
case EINVAL:
493
case EFBIG:
494
case EIO:
495
case ENOSPC:
496
default:
497
status = EX_IOERR;
498
break;
499
case EINTR:
500
status = EXIT_FAILURE;
501
break;
502
}
503
break;
504
}
505
written += (size_t)sret;
506
}
507
sret = close(STDOUT_FILENO);
508
if(sret == -1){
509
int e = errno;
510
error_plus(0, errno, "close");
511
switch(e){
512
case EBADF:
513
status = EX_OSFILE;
514
break;
515
case EIO:
516
default:
517
status = EX_IOERR;
518
break;
519
}
246
ret = write(STDOUT_FILENO, buffer + written, n - written);
247
if(ret < 0){
248
perror("write");
249
status = EXIT_FAILURE;
250
break;
251
}
252
written += (size_t)ret;
520
253
}
521
254
break;
522
255
}
523
if(sret < 0){
524
int e = errno;
525
if(errno != EINTR){
526
if(not feof(stdin)){
527
error_plus(0, errno, "getline");
528
switch(e){
529
case EBADF:
530
status = EX_UNAVAILABLE;
531
break;
532
case EIO:
533
case EINVAL:
534
default:
535
status = EX_IOERR;
536
break;
537
}
538
break;
539
} else {
540
clearerr(stdin);
541
}
256
if(ret < 0){
257
if(errno != EINTR and not feof(stdin)){
258
perror("getline");
259
status = EXIT_FAILURE;
260
break;
542
261
}
543
262
}
544
/* if(sret == 0), then the only sensible thing to do is to retry
545
to read from stdin */
263
/* if(ret == 0), then the only sensible thing to do is to retry to
264
read from stdin */
546
265
fputc('\n', stderr);
547
266
if(debug and not quit_now){
548
267
/* If quit_now is nonzero, we were interrupted by a signal, and
557
276
fprintf(stderr, "Restoring terminal attributes\n");
558
277
}
559
278
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
560
error_plus(0, errno, "tcsetattr+echo");
279
perror("tcsetattr+echo");
561
280
}
562
281
563
282
if(quit_now){
565
284
old_action.sa_handler = SIG_DFL;
566
285
ret = sigaction(signal_received, &old_action, NULL);
567
286
if(ret == -1){
568
error_plus(0, errno, "sigaction");
287
perror("sigaction");
569
288
}
570
289
raise(signal_received);
571
290
}
574
293
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
575
294
status);
576
295
}
577
if(status == EXIT_SUCCESS or status == EX_OK){
296
if(status == EXIT_SUCCESS){
578
297
fputc('\n', stderr);
579
298
}
580
299
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0