(root)/mandos/release
» Revision
237.2.123
(compared to revision 24.1.171)
: plugins.d/password-prompt.c
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- Committer: Teddy Hogeborn
- Date: 2009-09-05 17:39:34 UTC
- mto: (24.1.140 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 264.
- Revision ID: teddy@fukt.bsnet.se-20090905173934-gs0r858omhudc71m
* plugin-runner.c (main): Move variables "tmpmax" and "tmp" into
the innermost scope possible.
the innermost scope possible.
- files removed:
- DBUS-API
- debian/source
- 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 © 2008-2010 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
36
SIGQUIT, SIGHUP, SIGTERM,
36
37
raise() */
37
38
#include <stddef.h> /* NULL, size_t, ssize_t */
38
#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
39
ssize_t, open() */
39
#include <sys/types.h> /* ssize_t */
40
40
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
41
getenv(), free() */
42
#include <dirent.h> /* scandir(), alphasort() */
41
getopt_long, getenv() */
43
42
#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() */
43
stdin, feof(), perror(), fputc(),
44
stdout, getopt_long */
45
#include <errno.h> /* errno, EINVAL */
50
46
#include <iso646.h> /* or, not */
51
47
#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 */
48
#include <string.h> /* strlen, rindex, strncmp, strcmp */
55
49
#include <argp.h> /* struct argp_option, struct
56
50
argp_state, struct argp,
57
51
argp_parse(), error_t,
58
52
ARGP_KEY_ARG, ARGP_KEY_END,
59
53
ARGP_ERR_UNKNOWN */
60
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
61
EX_UNAVAILABLE, EX_IOERR, EX_OK */
62
#include <fcntl.h> /* open() */
63
54
64
55
volatile sig_atomic_t quit_now = 0;
65
56
int signal_received;
67
58
const char *argp_program_version = "password-prompt " VERSION;
68
59
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
69
60
70
/* Needed for conflict resolution */
71
const char plymouth_name[] = "plymouthd";
72
73
61
static void termination_handler(int signum){
74
62
if(quit_now){
75
63
return;
78
66
signal_received = signum;
79
67
}
80
68
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
195
196
69
int main(int argc, char **argv){
197
ssize_t sret;
198
int ret;
70
ssize_t ret;
199
71
size_t n;
200
72
struct termios t_new, t_old;
201
73
char *buffer = NULL;
211
83
.doc = "Prefix shown before the prompt", .group = 2 },
212
84
{ .name = "debug", .key = 128,
213
85
.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
86
{ .name = NULL }
224
87
};
225
88
226
89
error_t parse_opt (int key, char *arg, struct argp_state *state){
227
errno = 0;
228
90
switch (key){
229
91
case 'p':
230
92
prefix = arg;
232
94
case 128:
233
95
debug = true;
234
96
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);
97
case ARGP_KEY_ARG:
98
argp_usage(state);
99
break;
100
case ARGP_KEY_END:
248
101
break;
249
102
default:
250
103
return ARGP_ERR_UNKNOWN;
251
104
}
252
return errno;
105
return 0;
253
106
}
254
107
255
108
struct argp argp = { .options = options, .parser = parse_opt,
256
109
.args_doc = "",
257
110
.doc = "Mandos password-prompt -- Read and"
258
111
" 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;
112
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
113
if(ret == ARGP_ERR_UNKNOWN){
114
fprintf(stderr, "Unknown error while parsing arguments\n");
115
return EXIT_FAILURE;
271
116
}
272
117
}
273
118
274
119
if(debug){
275
120
fprintf(stderr, "Starting %s\n", argv[0]);
276
121
}
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
122
if(debug){
286
123
fprintf(stderr, "Storing current terminal attributes\n");
287
124
}
288
125
289
126
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
}
127
perror("tcgetattr");
128
return EXIT_FAILURE;
299
129
}
300
130
301
131
sigemptyset(&new_action.sa_mask);
302
132
ret = sigaddset(&new_action.sa_mask, SIGINT);
303
133
if(ret == -1){
304
error(0, errno, "sigaddset");
305
return EX_OSERR;
134
perror("sigaddset");
135
return EXIT_FAILURE;
306
136
}
307
137
ret = sigaddset(&new_action.sa_mask, SIGHUP);
308
138
if(ret == -1){
309
error(0, errno, "sigaddset");
310
return EX_OSERR;
139
perror("sigaddset");
140
return EXIT_FAILURE;
311
141
}
312
142
ret = sigaddset(&new_action.sa_mask, SIGTERM);
313
143
if(ret == -1){
314
error(0, errno, "sigaddset");
315
return EX_OSERR;
144
perror("sigaddset");
145
return EXIT_FAILURE;
316
146
}
317
147
/* Need to check if the handler is SIG_IGN before handling:
318
148
| [[info:libc:Initial Signal Actions]] |
320
150
*/
321
151
ret = sigaction(SIGINT, NULL, &old_action);
322
152
if(ret == -1){
323
error(0, errno, "sigaction");
324
return EX_OSERR;
153
perror("sigaction");
154
return EXIT_FAILURE;
325
155
}
326
156
if(old_action.sa_handler != SIG_IGN){
327
157
ret = sigaction(SIGINT, &new_action, NULL);
328
158
if(ret == -1){
329
error(0, errno, "sigaction");
330
return EX_OSERR;
159
perror("sigaction");
160
return EXIT_FAILURE;
331
161
}
332
162
}
333
163
ret = sigaction(SIGHUP, NULL, &old_action);
334
164
if(ret == -1){
335
error(0, errno, "sigaction");
336
return EX_OSERR;
165
perror("sigaction");
166
return EXIT_FAILURE;
337
167
}
338
168
if(old_action.sa_handler != SIG_IGN){
339
169
ret = sigaction(SIGHUP, &new_action, NULL);
340
170
if(ret == -1){
341
error(0, errno, "sigaction");
342
return EX_OSERR;
171
perror("sigaction");
172
return EXIT_FAILURE;
343
173
}
344
174
}
345
175
ret = sigaction(SIGTERM, NULL, &old_action);
346
176
if(ret == -1){
347
error(0, errno, "sigaction");
348
return EX_OSERR;
177
perror("sigaction");
178
return EXIT_FAILURE;
349
179
}
350
180
if(old_action.sa_handler != SIG_IGN){
351
181
ret = sigaction(SIGTERM, &new_action, NULL);
352
182
if(ret == -1){
353
error(0, errno, "sigaction");
354
return EX_OSERR;
183
perror("sigaction");
184
return EXIT_FAILURE;
355
185
}
356
186
}
357
187
361
191
}
362
192
363
193
t_new = t_old;
364
t_new.c_lflag &= ~(tcflag_t)ECHO;
194
t_new.c_lflag &= ~ECHO;
365
195
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
}
196
perror("tcsetattr-echo");
197
return EXIT_FAILURE;
376
198
}
377
199
378
200
if(debug){
379
201
fprintf(stderr, "Waiting for input from stdin \n");
380
202
}
391
213
fprintf(stderr, "%s ", prefix);
392
214
}
393
215
{
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";
216
const char *cryptsource = getenv("cryptsource");
217
const char *crypttarget = getenv("crypttarget");
218
const char *const prompt
219
= "Enter passphrase to unlock the disk";
405
220
if(cryptsource == NULL){
406
221
if(crypttarget == NULL){
407
fprintf(stderr, "%s to unlock the disk: ", prompt2);
222
fprintf(stderr, "%s: ", prompt);
408
223
} else {
409
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
410
prompt2);
224
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
411
225
}
412
226
} else {
413
227
if(crypttarget == NULL){
414
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
415
prompt2);
228
fprintf(stderr, "%s %s: ", prompt, cryptsource);
416
229
} else {
417
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
418
crypttarget, prompt2);
230
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
231
crypttarget);
419
232
}
420
233
}
421
234
}
422
sret = getline(&buffer, &n, stdin);
423
if(sret > 0){
235
ret = getline(&buffer, &n, stdin);
236
if(ret > 0){
424
237
status = EXIT_SUCCESS;
425
238
/* Make n = data size instead of allocated buffer size */
426
n = (size_t)sret;
239
n = (size_t)ret;
427
240
/* Strip final newline */
428
if(n > 0 and buffer[n-1] == '\n'){
241
if(n>0 and buffer[n-1] == '\n'){
429
242
buffer[n-1] = '\0'; /* not strictly necessary */
430
243
n--;
431
244
}
432
245
size_t written = 0;
433
246
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
}
247
ret = write(STDOUT_FILENO, buffer + written, n - written);
248
if(ret < 0){
249
perror("write");
250
status = EXIT_FAILURE;
251
break;
252
}
253
written += (size_t)ret;
469
254
}
470
255
break;
471
256
}
472
if(sret < 0){
473
int e = errno;
257
if(ret < 0){
474
258
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
}
259
perror("getline");
260
status = EXIT_FAILURE;
485
261
break;
486
262
}
487
263
}
488
/* if(sret == 0), then the only sensible thing to do is to retry
489
to read from stdin */
264
/* if(ret == 0), then the only sensible thing to do is to retry to
265
read from stdin */
490
266
fputc('\n', stderr);
491
267
if(debug and not quit_now){
492
268
/* If quit_now is nonzero, we were interrupted by a signal, and
501
277
fprintf(stderr, "Restoring terminal attributes\n");
502
278
}
503
279
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
504
error(0, errno, "tcsetattr+echo");
280
perror("tcsetattr+echo");
505
281
}
506
282
507
283
if(quit_now){
509
285
old_action.sa_handler = SIG_DFL;
510
286
ret = sigaction(signal_received, &old_action, NULL);
511
287
if(ret == -1){
512
error(0, errno, "sigaction");
288
perror("sigaction");
513
289
}
514
290
raise(signal_received);
515
291
}
518
294
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
519
295
status);
520
296
}
521
if(status == EXIT_SUCCESS or status == EX_OK){
297
if(status == EXIT_SUCCESS){
522
298
fputc('\n', stderr);
523
299
}
524
300
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