To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« 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 © 2008-2019 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
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
__builtin_unreachable();
278
case -3: /* --usage */
279
argp_state_help(state, state->out_stream,
280
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
281
__builtin_unreachable();
282
case 'V': /* --version */
283
fprintf(state->out_stream, "%s\n", argp_program_version);
284
exit(argp_err_exit_status);
92
case ARGP_KEY_ARG:
93
argp_usage (state);
94
break;
95
case ARGP_KEY_END:
285
96
break;
286
97
default:
287
98
return ARGP_ERR_UNKNOWN;
288
99
}
289
return errno;
100
return 0;
290
101
}
291
102
292
103
struct argp argp = { .options = options, .parser = parse_opt,
293
104
.args_doc = "",
294
105
.doc = "Mandos password-prompt -- Read and"
295
106
" output a password" };
296
ret = argp_parse(&argp, argc, argv,
297
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
298
switch(ret){
299
case 0:
300
break;
301
case ENOMEM:
302
default:
303
errno = ret;
304
error_plus(0, errno, "argp_parse");
305
return EX_OSERR;
306
case EINVAL:
307
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;
308
111
}
309
112
}
310
311
if(debug){
113
114
if (debug){
312
115
fprintf(stderr, "Starting %s\n", argv[0]);
313
116
}
314
315
if(conflict_detection()){
316
if(debug){
317
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
318
}
319
return EXIT_FAILURE;
320
}
321
322
if(debug){
117
if (debug){
323
118
fprintf(stderr, "Storing current terminal attributes\n");
324
119
}
325
120
326
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
327
int e = errno;
328
error_plus(0, errno, "tcgetattr");
329
switch(e){
330
case EBADF:
331
case ENOTTY:
332
return EX_UNAVAILABLE;
333
default:
334
return EX_OSERR;
335
}
121
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
122
perror("tcgetattr");
123
return EXIT_FAILURE;
336
124
}
337
125
338
126
sigemptyset(&new_action.sa_mask);
339
ret = sigaddset(&new_action.sa_mask, SIGINT);
340
if(ret == -1){
341
error_plus(0, errno, "sigaddset");
342
return EX_OSERR;
343
}
344
ret = sigaddset(&new_action.sa_mask, SIGHUP);
345
if(ret == -1){
346
error_plus(0, errno, "sigaddset");
347
return EX_OSERR;
348
}
349
ret = sigaddset(&new_action.sa_mask, SIGTERM);
350
if(ret == -1){
351
error_plus(0, errno, "sigaddset");
352
return EX_OSERR;
353
}
354
/* Need to check if the handler is SIG_IGN before handling:
355
| [[info:libc:Initial Signal Actions]] |
356
| [[info:libc:Basic Signal Handling]] |
357
*/
127
sigaddset(&new_action.sa_mask, SIGINT);
128
sigaddset(&new_action.sa_mask, SIGHUP);
129
sigaddset(&new_action.sa_mask, SIGTERM);
358
130
ret = sigaction(SIGINT, NULL, &old_action);
359
131
if(ret == -1){
360
error_plus(0, errno, "sigaction");
361
return EX_OSERR;
132
perror("sigaction");
133
return EXIT_FAILURE;
362
134
}
363
if(old_action.sa_handler != SIG_IGN){
135
if (old_action.sa_handler != SIG_IGN){
364
136
ret = sigaction(SIGINT, &new_action, NULL);
365
137
if(ret == -1){
366
error_plus(0, errno, "sigaction");
367
return EX_OSERR;
138
perror("sigaction");
139
return EXIT_FAILURE;
368
140
}
369
141
}
370
142
ret = sigaction(SIGHUP, NULL, &old_action);
371
143
if(ret == -1){
372
error_plus(0, errno, "sigaction");
373
return EX_OSERR;
144
perror("sigaction");
145
return EXIT_FAILURE;
374
146
}
375
if(old_action.sa_handler != SIG_IGN){
147
if (old_action.sa_handler != SIG_IGN){
376
148
ret = sigaction(SIGHUP, &new_action, NULL);
377
149
if(ret == -1){
378
error_plus(0, errno, "sigaction");
379
return EX_OSERR;
150
perror("sigaction");
151
return EXIT_FAILURE;
380
152
}
381
153
}
382
154
ret = sigaction(SIGTERM, NULL, &old_action);
383
155
if(ret == -1){
384
error_plus(0, errno, "sigaction");
385
return EX_OSERR;
156
perror("sigaction");
157
return EXIT_FAILURE;
386
158
}
387
if(old_action.sa_handler != SIG_IGN){
159
if (old_action.sa_handler != SIG_IGN){
388
160
ret = sigaction(SIGTERM, &new_action, NULL);
389
161
if(ret == -1){
390
error_plus(0, errno, "sigaction");
391
return EX_OSERR;
162
perror("sigaction");
163
return EXIT_FAILURE;
392
164
}
393
165
}
394
166
395
167
396
if(debug){
168
if (debug){
397
169
fprintf(stderr, "Removing echo flag from terminal attributes\n");
398
170
}
399
171
400
172
t_new = t_old;
401
t_new.c_lflag &= ~(tcflag_t)ECHO;
402
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
403
int e = errno;
404
error_plus(0, errno, "tcsetattr-echo");
405
switch(e){
406
case EBADF:
407
case ENOTTY:
408
return EX_UNAVAILABLE;
409
case EINVAL:
410
default:
411
return EX_OSERR;
412
}
173
t_new.c_lflag &= ~ECHO;
174
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
175
perror("tcsetattr-echo");
176
return EXIT_FAILURE;
413
177
}
414
415
if(debug){
178
179
if (debug){
416
180
fprintf(stderr, "Waiting for input from stdin \n");
417
181
}
418
182
while(true){
419
if(quit_now){
183
if (quit_now){
420
184
if(debug){
421
185
fprintf(stderr, "Interrupted by signal, exiting.\n");
422
186
}
428
192
fprintf(stderr, "%s ", prefix);
429
193
}
430
194
{
431
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
432
const char *crypttarget = getenv("CRYPTTAB_NAME");
433
/* Before cryptsetup 1.1.0~rc2 */
434
if(cryptsource == NULL){
435
cryptsource = getenv("cryptsource");
436
}
437
if(crypttarget == NULL){
438
crypttarget = getenv("crypttarget");
439
}
440
const char *const prompt1 = "Unlocking the disk";
441
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";
442
199
if(cryptsource == NULL){
443
200
if(crypttarget == NULL){
444
fprintf(stderr, "%s to unlock the disk: ", prompt2);
201
fprintf(stderr, "%s: ", prompt);
445
202
} else {
446
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
447
prompt2);
203
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
448
204
}
449
205
} else {
450
206
if(crypttarget == NULL){
451
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
452
prompt2);
207
fprintf(stderr, "%s %s: ", prompt, cryptsource);
453
208
} else {
454
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
455
crypttarget, prompt2);
209
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
210
crypttarget);
456
211
}
457
212
}
458
213
}
459
sret = getline(&buffer, &n, stdin);
460
if(sret > 0){
214
ret = getline(&buffer, &n, stdin);
215
if (ret > 0){
461
216
status = EXIT_SUCCESS;
462
217
/* Make n = data size instead of allocated buffer size */
463
n = (size_t)sret;
218
n = (size_t)ret;
464
219
/* Strip final newline */
465
if(n > 0 and buffer[n-1] == '\n'){
220
if(n>0 and buffer[n-1] == '\n'){
466
221
buffer[n-1] = '\0'; /* not strictly necessary */
467
222
n--;
468
223
}
469
224
size_t written = 0;
470
225
while(written < n){
471
sret = write(STDOUT_FILENO, buffer + written, n - written);
472
if(sret < 0){
473
int e = errno;
474
error_plus(0, errno, "write");
475
switch(e){
476
case EBADF:
477
case EFAULT:
478
case EINVAL:
479
case EFBIG:
480
case EIO:
481
case ENOSPC:
482
default:
483
status = EX_IOERR;
484
break;
485
case EINTR:
486
status = EXIT_FAILURE;
487
break;
488
}
489
break;
490
}
491
written += (size_t)sret;
492
}
493
sret = close(STDOUT_FILENO);
494
if(sret == -1){
495
int e = errno;
496
error_plus(0, errno, "close");
497
switch(e){
498
case EBADF:
499
status = EX_OSFILE;
500
break;
501
case EIO:
502
default:
503
status = EX_IOERR;
504
break;
505
}
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;
506
233
}
507
234
break;
508
235
}
509
if(sret < 0){
510
int e = errno;
511
if(errno != EINTR and not feof(stdin)){
512
error_plus(0, errno, "getline");
513
switch(e){
514
case EBADF:
515
status = EX_UNAVAILABLE;
516
break;
517
case EIO:
518
case EINVAL:
519
default:
520
status = EX_IOERR;
521
break;
522
}
236
if (ret < 0){
237
if (errno != EINTR and not feof(stdin)){
238
perror("getline");
239
status = EXIT_FAILURE;
523
240
break;
524
241
}
525
242
}
526
/* if(sret == 0), then the only sensible thing to do is to retry
527
to read from stdin */
243
/* if(ret == 0), then the only sensible thing to do is to retry to
244
read from stdin */
528
245
fputc('\n', stderr);
529
246
if(debug and not quit_now){
530
/* 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
531
248
will print that later, so no need to show this too. */
532
249
fprintf(stderr, "getline() returned 0, retrying.\n");
533
250
}
534
251
}
535
252
536
253
free(buffer);
537
254
538
if(debug){
255
if (debug){
539
256
fprintf(stderr, "Restoring terminal attributes\n");
540
257
}
541
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
542
error_plus(0, errno, "tcsetattr+echo");
543
}
544
545
if(quit_now){
546
sigemptyset(&old_action.sa_mask);
547
old_action.sa_handler = SIG_DFL;
548
ret = sigaction(signal_received, &old_action, NULL);
549
if(ret == -1){
550
error_plus(0, errno, "sigaction");
551
}
552
raise(signal_received);
553
}
554
555
if(debug){
258
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
259
perror("tcsetattr+echo");
260
}
261
262
if (debug){
556
263
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
557
264
status);
558
265
}
559
if(status == EXIT_SUCCESS or status == EX_OK){
266
if(status == EXIT_SUCCESS){
560
267
fputc('\n', stderr);
561
268
}
562
269
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0