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237.2.49
(compared to revision 237.7.30)
: plugins.d/password-prompt.c
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- Committer: Teddy Hogeborn
- Date: 2009-01-26 23:47:44 UTC
- mto: (24.1.131 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- Revision ID: teddy@fukt.bsnet.se-20090126234744-c19lb7zn1qsrcwmv
* debian/control (mandos/Depends): Added "python-gobject".
- files removed:
- DBUS-API
- debian/source
- 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
3
* Password-prompt - Read a password from the terminal and print it
4
4
*
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
23
* <https://www.fukt.bsnet.se/~teddy/>.
23
24
*/
24
25
25
#define _GNU_SOURCE /* getline(), asprintf() */
26
#define _GNU_SOURCE /* getline() */
26
27
27
#include <termios.h> /* struct termios, tcsetattr(),
28
#include <termios.h> /* struct termios, tcsetattr(),
28
29
TCSAFLUSH, tcgetattr(), ECHO */
29
30
#include <unistd.h> /* struct termios, tcsetattr(),
30
31
STDIN_FILENO, TCSAFLUSH,
31
tcgetattr(), ECHO, readlink() */
32
tcgetattr(), ECHO */
32
33
#include <signal.h> /* sig_atomic_t, raise(), struct
33
34
sigaction, sigemptyset(),
34
35
sigaction(), sigaddset(), SIGINT,
35
SIGQUIT, SIGHUP, SIGTERM,
36
raise() */
36
SIGQUIT, SIGHUP, SIGTERM */
37
37
#include <stddef.h> /* NULL, size_t, ssize_t */
38
#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
39
ssize_t, open() */
38
#include <sys/types.h> /* ssize_t */
40
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
41
getenv(), free() */
42
#include <dirent.h> /* scandir(), alphasort() */
40
getopt_long, getenv() */
43
41
#include <stdio.h> /* fprintf(), stderr, getline(),
44
stdin, feof(), fputc()
45
*/
46
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
47
EFAULT, EFBIG, EIO, ENOSPC, EINTR
48
*/
49
#include <error.h> /* error() */
42
stdin, feof(), perror(), fputc(),
43
stdout, getopt_long */
44
#include <errno.h> /* errno, EINVAL */
50
45
#include <iso646.h> /* or, not */
51
46
#include <stdbool.h> /* bool, false, true */
52
#include <inttypes.h> /* strtoumax() */
53
#include <sys/stat.h> /* struct stat, lstat(), open() */
54
#include <string.h> /* strlen, rindex, memcmp */
47
#include <string.h> /* strlen, rindex, strncmp, strcmp */
55
48
#include <argp.h> /* struct argp_option, struct
56
49
argp_state, struct argp,
57
50
argp_parse(), error_t,
58
51
ARGP_KEY_ARG, ARGP_KEY_END,
59
52
ARGP_ERR_UNKNOWN */
60
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
61
EX_UNAVAILABLE, EX_IOERR, EX_OK */
62
#include <fcntl.h> /* open() */
63
53
64
volatile sig_atomic_t quit_now = 0;
65
int signal_received;
54
volatile bool quit_now = false;
66
55
bool debug = false;
67
56
const char *argp_program_version = "password-prompt " VERSION;
68
57
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
69
58
70
/* Needed for conflict resolution */
71
const char plymouth_name[] = "plymouthd";
72
73
static void termination_handler(int signum){
74
if(quit_now){
75
return;
76
}
77
quit_now = 1;
78
signal_received = signum;
79
}
80
81
bool conflict_detection(void){
82
83
/* plymouth conflicts with password-prompt since both want to read
84
from the terminal. Password-prompt will exit if it detects
85
plymouth since plymouth performs the same functionality.
86
*/
87
int is_plymouth(const struct dirent *proc_entry){
88
int ret;
89
int cl_fd;
90
{
91
uintmax_t maxvalue;
92
char *tmp;
93
errno = 0;
94
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
95
96
if(errno != 0 or *tmp != '\0'
97
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
98
return 0;
99
}
100
}
101
102
char *cmdline_filename;
103
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
104
proc_entry->d_name);
105
if(ret == -1){
106
error(0, errno, "asprintf");
107
return 0;
108
}
109
110
/* Open /proc/<pid>/cmdline */
111
cl_fd = open(cmdline_filename, O_RDONLY);
112
free(cmdline_filename);
113
if(cl_fd == -1){
114
if(errno != ENOENT){
115
error(0, errno, "open");
116
}
117
return 0;
118
}
119
120
char *cmdline = NULL;
121
{
122
size_t cmdline_len = 0;
123
size_t cmdline_allocated = 0;
124
char *tmp;
125
const size_t blocksize = 1024;
126
ssize_t sret;
127
do {
128
/* Allocate more space? */
129
if(cmdline_len + blocksize + 1 > cmdline_allocated){
130
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
131
if(tmp == NULL){
132
error(0, errno, "realloc");
133
free(cmdline);
134
close(cl_fd);
135
return 0;
136
}
137
cmdline = tmp;
138
cmdline_allocated += blocksize;
139
}
140
141
/* Read data */
142
sret = read(cl_fd, cmdline + cmdline_len,
143
cmdline_allocated - cmdline_len);
144
if(sret == -1){
145
error(0, errno, "read");
146
free(cmdline);
147
close(cl_fd);
148
return 0;
149
}
150
cmdline_len += (size_t)sret;
151
} while(sret != 0);
152
ret = close(cl_fd);
153
if(ret == -1){
154
error(0, errno, "close");
155
free(cmdline);
156
return 0;
157
}
158
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
159
}
160
/* we now have cmdline */
161
162
/* get basename */
163
char *cmdline_base = strrchr(cmdline, '/');
164
if(cmdline_base != NULL){
165
cmdline_base += 1; /* skip the slash */
166
} else {
167
cmdline_base = cmdline;
168
}
169
170
if(strcmp(cmdline_base, plymouth_name) != 0){
171
if(debug){
172
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
173
plymouth_name);
174
}
175
free(cmdline);
176
return 0;
177
}
178
if(debug){
179
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
180
plymouth_name);
181
}
182
free(cmdline);
183
return 1;
184
}
185
186
struct dirent **direntries;
187
int ret;
188
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
189
if (ret == -1){
190
error(1, errno, "scandir");
191
}
192
return ret > 0;
193
}
194
59
static void termination_handler(__attribute__((unused))int signum){
60
quit_now = true;
61
}
195
62
196
63
int main(int argc, char **argv){
197
ssize_t sret;
198
int ret;
64
ssize_t ret;
199
65
size_t n;
200
66
struct termios t_new, t_old;
201
67
char *buffer = NULL;
211
77
.doc = "Prefix shown before the prompt", .group = 2 },
212
78
{ .name = "debug", .key = 128,
213
79
.doc = "Debug mode", .group = 3 },
214
/*
215
* These reproduce what we would get without ARGP_NO_HELP
216
*/
217
{ .name = "help", .key = '?',
218
.doc = "Give this help list", .group = -1 },
219
{ .name = "usage", .key = -3,
220
.doc = "Give a short usage message", .group = -1 },
221
{ .name = "version", .key = 'V',
222
.doc = "Print program version", .group = -1 },
223
80
{ .name = NULL }
224
81
};
225
82
226
error_t parse_opt (int key, char *arg, struct argp_state *state){
227
errno = 0;
228
switch (key){
83
error_t parse_opt (int key, char *arg, struct argp_state *state) {
84
switch (key) {
229
85
case 'p':
230
86
prefix = arg;
231
87
break;
232
88
case 128:
233
89
debug = true;
234
90
break;
235
/*
236
* These reproduce what we would get without ARGP_NO_HELP
237
*/
238
case '?': /* --help */
239
argp_state_help(state, state->out_stream,
240
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
241
& ~(unsigned int)ARGP_HELP_EXIT_OK);
242
case -3: /* --usage */
243
argp_state_help(state, state->out_stream,
244
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
245
case 'V': /* --version */
246
fprintf(state->out_stream, "%s\n", argp_program_version);
247
exit(argp_err_exit_status);
91
case ARGP_KEY_ARG:
92
argp_usage(state);
93
break;
94
case ARGP_KEY_END:
248
95
break;
249
96
default:
250
97
return ARGP_ERR_UNKNOWN;
251
98
}
252
return errno;
99
return 0;
253
100
}
254
101
255
102
struct argp argp = { .options = options, .parser = parse_opt,
256
103
.args_doc = "",
257
104
.doc = "Mandos password-prompt -- Read and"
258
105
" output a password" };
259
ret = argp_parse(&argp, argc, argv,
260
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
261
switch(ret){
262
case 0:
263
break;
264
case ENOMEM:
265
default:
266
errno = ret;
267
error(0, errno, "argp_parse");
268
return EX_OSERR;
269
case EINVAL:
270
return EX_USAGE;
106
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
107
if(ret == ARGP_ERR_UNKNOWN){
108
fprintf(stderr, "Unknown error while parsing arguments\n");
109
return EXIT_FAILURE;
271
110
}
272
111
}
273
112
274
113
if(debug){
275
114
fprintf(stderr, "Starting %s\n", argv[0]);
276
115
}
277
278
if (conflict_detection()){
279
if(debug){
280
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
281
}
282
return EXIT_FAILURE;
283
}
284
285
116
if(debug){
286
117
fprintf(stderr, "Storing current terminal attributes\n");
287
118
}
288
119
289
120
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
290
int e = errno;
291
error(0, errno, "tcgetattr");
292
switch(e){
293
case EBADF:
294
case ENOTTY:
295
return EX_UNAVAILABLE;
296
default:
297
return EX_OSERR;
298
}
121
perror("tcgetattr");
122
return EXIT_FAILURE;
299
123
}
300
124
301
125
sigemptyset(&new_action.sa_mask);
302
ret = sigaddset(&new_action.sa_mask, SIGINT);
303
if(ret == -1){
304
error(0, errno, "sigaddset");
305
return EX_OSERR;
306
}
307
ret = sigaddset(&new_action.sa_mask, SIGHUP);
308
if(ret == -1){
309
error(0, errno, "sigaddset");
310
return EX_OSERR;
311
}
312
ret = sigaddset(&new_action.sa_mask, SIGTERM);
313
if(ret == -1){
314
error(0, errno, "sigaddset");
315
return EX_OSERR;
316
}
317
/* Need to check if the handler is SIG_IGN before handling:
318
| [[info:libc:Initial Signal Actions]] |
319
| [[info:libc:Basic Signal Handling]] |
320
*/
126
sigaddset(&new_action.sa_mask, SIGINT);
127
sigaddset(&new_action.sa_mask, SIGHUP);
128
sigaddset(&new_action.sa_mask, SIGTERM);
321
129
ret = sigaction(SIGINT, NULL, &old_action);
322
130
if(ret == -1){
323
error(0, errno, "sigaction");
324
return EX_OSERR;
131
perror("sigaction");
132
return EXIT_FAILURE;
325
133
}
326
134
if(old_action.sa_handler != SIG_IGN){
327
135
ret = sigaction(SIGINT, &new_action, NULL);
328
136
if(ret == -1){
329
error(0, errno, "sigaction");
330
return EX_OSERR;
137
perror("sigaction");
138
return EXIT_FAILURE;
331
139
}
332
140
}
333
141
ret = sigaction(SIGHUP, NULL, &old_action);
334
142
if(ret == -1){
335
error(0, errno, "sigaction");
336
return EX_OSERR;
143
perror("sigaction");
144
return EXIT_FAILURE;
337
145
}
338
146
if(old_action.sa_handler != SIG_IGN){
339
147
ret = sigaction(SIGHUP, &new_action, NULL);
340
148
if(ret == -1){
341
error(0, errno, "sigaction");
342
return EX_OSERR;
149
perror("sigaction");
150
return EXIT_FAILURE;
343
151
}
344
152
}
345
153
ret = sigaction(SIGTERM, NULL, &old_action);
346
154
if(ret == -1){
347
error(0, errno, "sigaction");
348
return EX_OSERR;
155
perror("sigaction");
156
return EXIT_FAILURE;
349
157
}
350
158
if(old_action.sa_handler != SIG_IGN){
351
159
ret = sigaction(SIGTERM, &new_action, NULL);
352
160
if(ret == -1){
353
error(0, errno, "sigaction");
354
return EX_OSERR;
161
perror("sigaction");
162
return EXIT_FAILURE;
355
163
}
356
164
}
357
165
361
169
}
362
170
363
171
t_new = t_old;
364
t_new.c_lflag &= ~(tcflag_t)ECHO;
172
t_new.c_lflag &= ~ECHO;
365
173
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
366
int e = errno;
367
error(0, errno, "tcsetattr-echo");
368
switch(e){
369
case EBADF:
370
case ENOTTY:
371
return EX_UNAVAILABLE;
372
case EINVAL:
373
default:
374
return EX_OSERR;
375
}
174
perror("tcsetattr-echo");
175
return EXIT_FAILURE;
376
176
}
377
177
378
178
if(debug){
379
179
fprintf(stderr, "Waiting for input from stdin \n");
380
180
}
391
191
fprintf(stderr, "%s ", prefix);
392
192
}
393
193
{
394
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
395
const char *crypttarget = getenv("CRYPTTAB_NAME");
396
/* Before cryptsetup 1.1.0~rc2 */
397
if(cryptsource == NULL){
398
cryptsource = getenv("cryptsource");
399
}
400
if(crypttarget == NULL){
401
crypttarget = getenv("crypttarget");
402
}
403
const char *const prompt1 = "Unlocking the disk";
404
const char *const prompt2 = "Enter passphrase";
194
const char *cryptsource = getenv("cryptsource");
195
const char *crypttarget = getenv("crypttarget");
196
const char *const prompt
197
= "Enter passphrase to unlock the disk";
405
198
if(cryptsource == NULL){
406
199
if(crypttarget == NULL){
407
fprintf(stderr, "%s to unlock the disk: ", prompt2);
200
fprintf(stderr, "%s: ", prompt);
408
201
} else {
409
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
410
prompt2);
202
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
411
203
}
412
204
} else {
413
205
if(crypttarget == NULL){
414
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
415
prompt2);
206
fprintf(stderr, "%s %s: ", prompt, cryptsource);
416
207
} else {
417
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
418
crypttarget, prompt2);
208
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
209
crypttarget);
419
210
}
420
211
}
421
212
}
422
sret = getline(&buffer, &n, stdin);
423
if(sret > 0){
213
ret = getline(&buffer, &n, stdin);
214
if(ret > 0){
424
215
status = EXIT_SUCCESS;
425
216
/* Make n = data size instead of allocated buffer size */
426
n = (size_t)sret;
217
n = (size_t)ret;
427
218
/* Strip final newline */
428
if(n > 0 and buffer[n-1] == '\n'){
219
if(n>0 and buffer[n-1] == '\n'){
429
220
buffer[n-1] = '\0'; /* not strictly necessary */
430
221
n--;
431
222
}
432
223
size_t written = 0;
433
224
while(written < n){
434
sret = write(STDOUT_FILENO, buffer + written, n - written);
435
if(sret < 0){
436
int e = errno;
437
error(0, errno, "write");
438
switch(e){
439
case EBADF:
440
case EFAULT:
441
case EINVAL:
442
case EFBIG:
443
case EIO:
444
case ENOSPC:
445
default:
446
status = EX_IOERR;
447
break;
448
case EINTR:
449
status = EXIT_FAILURE;
450
break;
451
}
452
break;
453
}
454
written += (size_t)sret;
455
}
456
sret = close(STDOUT_FILENO);
457
if(sret == -1){
458
int e = errno;
459
error(0, errno, "close");
460
switch(e){
461
case EBADF:
462
status = EX_OSFILE;
463
break;
464
case EIO:
465
default:
466
status = EX_IOERR;
467
break;
468
}
225
ret = write(STDOUT_FILENO, buffer + written, n - written);
226
if(ret < 0){
227
perror("write");
228
status = EXIT_FAILURE;
229
break;
230
}
231
written += (size_t)ret;
469
232
}
470
233
break;
471
234
}
472
if(sret < 0){
473
int e = errno;
235
if(ret < 0){
474
236
if(errno != EINTR and not feof(stdin)){
475
error(0, errno, "getline");
476
switch(e){
477
case EBADF:
478
status = EX_UNAVAILABLE;
479
case EIO:
480
case EINVAL:
481
default:
482
status = EX_IOERR;
483
break;
484
}
237
perror("getline");
238
status = EXIT_FAILURE;
485
239
break;
486
240
}
487
241
}
488
/* if(sret == 0), then the only sensible thing to do is to retry
489
to read from stdin */
242
/* if(ret == 0), then the only sensible thing to do is to retry to
243
read from stdin */
490
244
fputc('\n', stderr);
491
245
if(debug and not quit_now){
492
/* If quit_now is nonzero, we were interrupted by a signal, and
246
/* If quit_now is true, we were interrupted by a signal, and
493
247
will print that later, so no need to show this too. */
494
248
fprintf(stderr, "getline() returned 0, retrying.\n");
495
249
}
501
255
fprintf(stderr, "Restoring terminal attributes\n");
502
256
}
503
257
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
504
error(0, errno, "tcsetattr+echo");
505
}
506
507
if(quit_now){
508
sigemptyset(&old_action.sa_mask);
509
old_action.sa_handler = SIG_DFL;
510
ret = sigaction(signal_received, &old_action, NULL);
511
if(ret == -1){
512
error(0, errno, "sigaction");
513
}
514
raise(signal_received);
258
perror("tcsetattr+echo");
515
259
}
516
260
517
261
if(debug){
518
262
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
519
263
status);
520
264
}
521
if(status == EXIT_SUCCESS or status == EX_OK){
265
if(status == EXIT_SUCCESS){
522
266
fputc('\n', stderr);
523
267
}
524
268
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