To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/password-prompt.c
- browse files at revision 181
- compare with another revision
- download diff
- download tarball
- view history from revision 181
- Committer: Teddy Hogeborn
- Date: 2008-09-08 18:54:47 UTC
- Revision ID: teddy@fukt.bsnet.se-20080908185447-dm2ertwxa20qbckf
* INSTALL: Even better text.
- files added:
- etc-plugins.d-README
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2007-2008 Teddy Hogeborn & Björn Påhlsson
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
16
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
15
* General Public License for more details.
19
16
*
20
17
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
22
20
*
23
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
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
29
#include <unistd.h> /* struct termios, tcsetattr(),
31
30
STDIN_FILENO, TCSAFLUSH,
32
tcgetattr(), ECHO, readlink() */
31
tcgetattr(), ECHO */
33
32
#include <signal.h> /* sig_atomic_t, raise(), struct
34
33
sigaction, sigemptyset(),
35
34
sigaction(), sigaddset(), SIGINT,
36
SIGQUIT, SIGHUP, SIGTERM,
37
raise() */
35
SIGQUIT, SIGHUP, SIGTERM */
38
36
#include <stddef.h> /* NULL, size_t, ssize_t */
39
#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
40
ssize_t, open() */
37
#include <sys/types.h> /* ssize_t */
41
38
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
42
getenv(), free() */
43
#include <dirent.h> /* scandir(), alphasort() */
39
getopt_long, getenv() */
44
40
#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() */
41
stdin, feof(), perror(), fputc(),
42
stdout, getopt_long */
43
#include <errno.h> /* errno, EINVAL */
51
44
#include <iso646.h> /* or, not */
52
45
#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
*/
46
#include <string.h> /* strlen, rindex, strncmp, strcmp */
57
47
#include <argp.h> /* struct argp_option, struct
58
48
argp_state, struct argp,
59
49
argp_parse(), error_t,
60
50
ARGP_KEY_ARG, ARGP_KEY_END,
61
51
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
52
67
volatile sig_atomic_t quit_now = 0;
68
int signal_received;
53
volatile bool quit_now = false;
69
54
bool debug = false;
70
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
55
const char *argp_program_version = "password-prompt 1.0";
56
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
57
58
static void termination_handler(__attribute__((unused))int signum){
59
quit_now = true;
60
}
229
61
230
62
int main(int argc, char **argv){
231
ssize_t sret;
232
int ret;
63
ssize_t ret;
233
64
size_t n;
234
65
struct termios t_new, t_old;
235
66
char *buffer = NULL;
245
76
.doc = "Prefix shown before the prompt", .group = 2 },
246
77
{ .name = "debug", .key = 128,
247
78
.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
79
{ .name = NULL }
258
80
};
259
260
__attribute__((nonnull(3)))
261
error_t parse_opt (int key, char *arg, struct argp_state *state){
262
errno = 0;
263
switch (key){
81
82
error_t parse_opt (int key, char *arg, struct argp_state *state) {
83
/* Get the INPUT argument from `argp_parse', which we know is a
84
pointer to our plugin list pointer. */
85
switch (key) {
264
86
case 'p':
265
87
prefix = arg;
266
88
break;
267
89
case 128:
268
90
debug = true;
269
91
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);
92
case ARGP_KEY_ARG:
93
argp_usage (state);
94
break;
95
case ARGP_KEY_END:
283
96
break;
284
97
default:
285
98
return ARGP_ERR_UNKNOWN;
286
99
}
287
return errno;
100
return 0;
288
101
}
289
102
290
103
struct argp argp = { .options = options, .parser = parse_opt,
291
104
.args_doc = "",
292
105
.doc = "Mandos password-prompt -- Read and"
293
106
" 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;
107
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
108
if (ret == ARGP_ERR_UNKNOWN){
109
fprintf(stderr, "Unknown error while parsing arguments\n");
110
return EXIT_FAILURE;
306
111
}
307
112
}
308
309
if(debug){
113
114
if (debug){
310
115
fprintf(stderr, "Starting %s\n", argv[0]);
311
116
}
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){
117
if (debug){
321
118
fprintf(stderr, "Storing current terminal attributes\n");
322
119
}
323
120
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
}
121
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
122
perror("tcgetattr");
123
return EXIT_FAILURE;
334
124
}
335
125
336
126
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
*/
127
sigaddset(&new_action.sa_mask, SIGINT);
128
sigaddset(&new_action.sa_mask, SIGHUP);
129
sigaddset(&new_action.sa_mask, SIGTERM);
356
130
ret = sigaction(SIGINT, NULL, &old_action);
357
131
if(ret == -1){
358
error_plus(0, errno, "sigaction");
359
return EX_OSERR;
132
perror("sigaction");
133
return EXIT_FAILURE;
360
134
}
361
if(old_action.sa_handler != SIG_IGN){
135
if (old_action.sa_handler != SIG_IGN){
362
136
ret = sigaction(SIGINT, &new_action, NULL);
363
137
if(ret == -1){
364
error_plus(0, errno, "sigaction");
365
return EX_OSERR;
138
perror("sigaction");
139
return EXIT_FAILURE;
366
140
}
367
141
}
368
142
ret = sigaction(SIGHUP, NULL, &old_action);
369
143
if(ret == -1){
370
error_plus(0, errno, "sigaction");
371
return EX_OSERR;
144
perror("sigaction");
145
return EXIT_FAILURE;
372
146
}
373
if(old_action.sa_handler != SIG_IGN){
147
if (old_action.sa_handler != SIG_IGN){
374
148
ret = sigaction(SIGHUP, &new_action, NULL);
375
149
if(ret == -1){
376
error_plus(0, errno, "sigaction");
377
return EX_OSERR;
150
perror("sigaction");
151
return EXIT_FAILURE;
378
152
}
379
153
}
380
154
ret = sigaction(SIGTERM, NULL, &old_action);
381
155
if(ret == -1){
382
error_plus(0, errno, "sigaction");
383
return EX_OSERR;
156
perror("sigaction");
157
return EXIT_FAILURE;
384
158
}
385
if(old_action.sa_handler != SIG_IGN){
159
if (old_action.sa_handler != SIG_IGN){
386
160
ret = sigaction(SIGTERM, &new_action, NULL);
387
161
if(ret == -1){
388
error_plus(0, errno, "sigaction");
389
return EX_OSERR;
162
perror("sigaction");
163
return EXIT_FAILURE;
390
164
}
391
165
}
392
166
393
167
394
if(debug){
168
if (debug){
395
169
fprintf(stderr, "Removing echo flag from terminal attributes\n");
396
170
}
397
171
398
172
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
}
173
t_new.c_lflag &= ~ECHO;
174
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
175
perror("tcsetattr-echo");
176
return EXIT_FAILURE;
411
177
}
412
413
if(debug){
178
179
if (debug){
414
180
fprintf(stderr, "Waiting for input from stdin \n");
415
181
}
416
182
while(true){
417
if(quit_now){
183
if (quit_now){
418
184
if(debug){
419
185
fprintf(stderr, "Interrupted by signal, exiting.\n");
420
186
}
426
192
fprintf(stderr, "%s ", prefix);
427
193
}
428
194
{
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";
195
const char *cryptsource = getenv("cryptsource");
196
const char *crypttarget = getenv("crypttarget");
197
const char *const prompt
198
= "Enter passphrase to unlock the disk";
440
199
if(cryptsource == NULL){
441
200
if(crypttarget == NULL){
442
fprintf(stderr, "%s to unlock the disk: ", prompt2);
201
fprintf(stderr, "%s: ", prompt);
443
202
} else {
444
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
445
prompt2);
203
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
446
204
}
447
205
} else {
448
206
if(crypttarget == NULL){
449
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
450
prompt2);
207
fprintf(stderr, "%s %s: ", prompt, cryptsource);
451
208
} else {
452
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
453
crypttarget, prompt2);
209
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
210
crypttarget);
454
211
}
455
212
}
456
213
}
457
sret = getline(&buffer, &n, stdin);
458
if(sret > 0){
214
ret = getline(&buffer, &n, stdin);
215
if (ret > 0){
459
216
status = EXIT_SUCCESS;
460
217
/* Make n = data size instead of allocated buffer size */
461
n = (size_t)sret;
218
n = (size_t)ret;
462
219
/* Strip final newline */
463
if(n > 0 and buffer[n-1] == '\n'){
220
if(n>0 and buffer[n-1] == '\n'){
464
221
buffer[n-1] = '\0'; /* not strictly necessary */
465
222
n--;
466
223
}
467
224
size_t written = 0;
468
225
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
}
226
ret = write(STDOUT_FILENO, buffer + written, n - written);
227
if(ret < 0){
228
perror("write");
229
status = EXIT_FAILURE;
230
break;
231
}
232
written += (size_t)ret;
504
233
}
505
234
break;
506
235
}
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
}
236
if (ret < 0){
237
if (errno != EINTR and not feof(stdin)){
238
perror("getline");
239
status = EXIT_FAILURE;
521
240
break;
522
241
}
523
242
}
524
/* if(sret == 0), then the only sensible thing to do is to retry
525
to read from stdin */
243
/* if(ret == 0), then the only sensible thing to do is to retry to
244
read from stdin */
526
245
fputc('\n', stderr);
527
246
if(debug and not quit_now){
528
/* If quit_now is nonzero, we were interrupted by a signal, and
247
/* If quit_now is true, we were interrupted by a signal, and
529
248
will print that later, so no need to show this too. */
530
249
fprintf(stderr, "getline() returned 0, retrying.\n");
531
250
}
532
251
}
533
252
534
253
free(buffer);
535
254
536
if(debug){
255
if (debug){
537
256
fprintf(stderr, "Restoring terminal attributes\n");
538
257
}
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){
258
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
259
perror("tcsetattr+echo");
260
}
261
262
if (debug){
554
263
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
555
264
status);
556
265
}
557
if(status == EXIT_SUCCESS or status == EX_OK){
266
if(status == EXIT_SUCCESS){
558
267
fputc('\n', stderr);
559
268
}
560
269
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0