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» Revision
237.2.82
(compared to revision 24.1.174)
: plugins.d/password-prompt.c
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- Committer: Teddy Hogeborn
- Date: 2009-02-15 09:28:06 UTC
- mto: (237.4.2 mandos-pipe-ipc) (24.1.137 mandos) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 252.
- Revision ID: teddy@fukt.bsnet.se-20090215092806-l0uq42v3j1rq3gmi
* INSTALL: Changed "Python 2.4" to "Python 2.5".
* mandos.lsm: - '' -
* mandos.lsm: - '' -
- 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(), vfprintf(), vasprintf()
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, strerror() */
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
#include <stdarg.h> /* va_list, va_start(), ... */
64
53
65
54
volatile sig_atomic_t quit_now = 0;
66
int signal_received;
67
55
bool debug = false;
68
56
const char *argp_program_version = "password-prompt " VERSION;
69
57
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
70
58
71
/* Needed for conflict resolution */
72
const char plymouth_name[] = "plymouthd";
73
74
/* Function to use when printing errors */
75
void error_plus(int status, int errnum, const char *formatstring, ...){
76
va_list ap;
77
char *text;
78
int ret;
79
80
va_start(ap, formatstring);
81
ret = vasprintf(&text, formatstring, ap);
82
if (ret == -1){
83
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
84
vfprintf(stderr, formatstring, ap);
85
fprintf(stderr, ": ");
86
fprintf(stderr, "%s\n", strerror(errnum));
87
error(status, errno, "vasprintf while printing error");
88
return;
89
}
90
fprintf(stderr, "Mandos plugin ");
91
error(status, errnum, "%s", text);
92
free(text);
93
}
94
95
static void termination_handler(int signum){
96
if(quit_now){
97
return;
98
}
59
static void termination_handler(__attribute__((unused))int signum){
99
60
quit_now = 1;
100
signal_received = signum;
101
}
102
103
bool conflict_detection(void){
104
105
/* plymouth conflicts with password-prompt since both want to read
106
from the terminal. Password-prompt will exit if it detects
107
plymouth since plymouth performs the same functionality.
108
*/
109
int is_plymouth(const struct dirent *proc_entry){
110
int ret;
111
int cl_fd;
112
{
113
uintmax_t maxvalue;
114
char *tmp;
115
errno = 0;
116
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
117
118
if(errno != 0 or *tmp != '\0'
119
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
120
return 0;
121
}
122
}
123
124
char *cmdline_filename;
125
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
126
proc_entry->d_name);
127
if(ret == -1){
128
error(0, errno, "asprintf");
129
return 0;
130
}
131
132
/* Open /proc/<pid>/cmdline */
133
cl_fd = open(cmdline_filename, O_RDONLY);
134
free(cmdline_filename);
135
if(cl_fd == -1){
136
if(errno != ENOENT){
137
error(0, errno, "open");
138
}
139
return 0;
140
}
141
142
char *cmdline = NULL;
143
{
144
size_t cmdline_len = 0;
145
size_t cmdline_allocated = 0;
146
char *tmp;
147
const size_t blocksize = 1024;
148
ssize_t sret;
149
do {
150
/* Allocate more space? */
151
if(cmdline_len + blocksize + 1 > cmdline_allocated){
152
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
153
if(tmp == NULL){
154
error(0, errno, "realloc");
155
free(cmdline);
156
close(cl_fd);
157
return 0;
158
}
159
cmdline = tmp;
160
cmdline_allocated += blocksize;
161
}
162
163
/* Read data */
164
sret = read(cl_fd, cmdline + cmdline_len,
165
cmdline_allocated - cmdline_len);
166
if(sret == -1){
167
error(0, errno, "read");
168
free(cmdline);
169
close(cl_fd);
170
return 0;
171
}
172
cmdline_len += (size_t)sret;
173
} while(sret != 0);
174
ret = close(cl_fd);
175
if(ret == -1){
176
error(0, errno, "close");
177
free(cmdline);
178
return 0;
179
}
180
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
181
}
182
/* we now have cmdline */
183
184
/* get basename */
185
char *cmdline_base = strrchr(cmdline, '/');
186
if(cmdline_base != NULL){
187
cmdline_base += 1; /* skip the slash */
188
} else {
189
cmdline_base = cmdline;
190
}
191
192
if(strcmp(cmdline_base, plymouth_name) != 0){
193
if(debug){
194
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
195
plymouth_name);
196
}
197
free(cmdline);
198
return 0;
199
}
200
if(debug){
201
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
202
plymouth_name);
203
}
204
free(cmdline);
205
return 1;
206
}
207
208
struct dirent **direntries;
209
int ret;
210
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
211
if (ret == -1){
212
error(1, errno, "scandir");
213
}
214
return ret > 0;
215
}
216
61
}
217
62
218
63
int main(int argc, char **argv){
219
ssize_t sret;
220
int ret;
64
ssize_t ret;
221
65
size_t n;
222
66
struct termios t_new, t_old;
223
67
char *buffer = NULL;
233
77
.doc = "Prefix shown before the prompt", .group = 2 },
234
78
{ .name = "debug", .key = 128,
235
79
.doc = "Debug mode", .group = 3 },
236
/*
237
* These reproduce what we would get without ARGP_NO_HELP
238
*/
239
{ .name = "help", .key = '?',
240
.doc = "Give this help list", .group = -1 },
241
{ .name = "usage", .key = -3,
242
.doc = "Give a short usage message", .group = -1 },
243
{ .name = "version", .key = 'V',
244
.doc = "Print program version", .group = -1 },
245
80
{ .name = NULL }
246
81
};
247
82
248
83
error_t parse_opt (int key, char *arg, struct argp_state *state){
249
errno = 0;
250
84
switch (key){
251
85
case 'p':
252
86
prefix = arg;
254
88
case 128:
255
89
debug = true;
256
90
break;
257
/*
258
* These reproduce what we would get without ARGP_NO_HELP
259
*/
260
case '?': /* --help */
261
argp_state_help(state, state->out_stream,
262
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
263
& ~(unsigned int)ARGP_HELP_EXIT_OK);
264
case -3: /* --usage */
265
argp_state_help(state, state->out_stream,
266
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
267
case 'V': /* --version */
268
fprintf(state->out_stream, "%s\n", argp_program_version);
269
exit(argp_err_exit_status);
91
case ARGP_KEY_ARG:
92
argp_usage(state);
93
break;
94
case ARGP_KEY_END:
270
95
break;
271
96
default:
272
97
return ARGP_ERR_UNKNOWN;
273
98
}
274
return errno;
99
return 0;
275
100
}
276
101
277
102
struct argp argp = { .options = options, .parser = parse_opt,
278
103
.args_doc = "",
279
104
.doc = "Mandos password-prompt -- Read and"
280
105
" output a password" };
281
ret = argp_parse(&argp, argc, argv,
282
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
283
switch(ret){
284
case 0:
285
break;
286
case ENOMEM:
287
default:
288
errno = ret;
289
error(0, errno, "argp_parse");
290
return EX_OSERR;
291
case EINVAL:
292
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;
293
110
}
294
111
}
295
112
296
113
if(debug){
297
114
fprintf(stderr, "Starting %s\n", argv[0]);
298
115
}
299
300
if (conflict_detection()){
301
if(debug){
302
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
303
}
304
return EXIT_FAILURE;
305
}
306
307
116
if(debug){
308
117
fprintf(stderr, "Storing current terminal attributes\n");
309
118
}
310
119
311
120
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
312
int e = errno;
313
error(0, errno, "tcgetattr");
314
switch(e){
315
case EBADF:
316
case ENOTTY:
317
return EX_UNAVAILABLE;
318
default:
319
return EX_OSERR;
320
}
121
perror("tcgetattr");
122
return EXIT_FAILURE;
321
123
}
322
124
323
125
sigemptyset(&new_action.sa_mask);
324
ret = sigaddset(&new_action.sa_mask, SIGINT);
325
if(ret == -1){
326
error(0, errno, "sigaddset");
327
return EX_OSERR;
328
}
329
ret = sigaddset(&new_action.sa_mask, SIGHUP);
330
if(ret == -1){
331
error(0, errno, "sigaddset");
332
return EX_OSERR;
333
}
334
ret = sigaddset(&new_action.sa_mask, SIGTERM);
335
if(ret == -1){
336
error(0, errno, "sigaddset");
337
return EX_OSERR;
338
}
339
/* Need to check if the handler is SIG_IGN before handling:
340
| [[info:libc:Initial Signal Actions]] |
341
| [[info:libc:Basic Signal Handling]] |
342
*/
126
sigaddset(&new_action.sa_mask, SIGINT);
127
sigaddset(&new_action.sa_mask, SIGHUP);
128
sigaddset(&new_action.sa_mask, SIGTERM);
343
129
ret = sigaction(SIGINT, NULL, &old_action);
344
130
if(ret == -1){
345
error(0, errno, "sigaction");
346
return EX_OSERR;
131
perror("sigaction");
132
return EXIT_FAILURE;
347
133
}
348
134
if(old_action.sa_handler != SIG_IGN){
349
135
ret = sigaction(SIGINT, &new_action, NULL);
350
136
if(ret == -1){
351
error(0, errno, "sigaction");
352
return EX_OSERR;
137
perror("sigaction");
138
return EXIT_FAILURE;
353
139
}
354
140
}
355
141
ret = sigaction(SIGHUP, NULL, &old_action);
356
142
if(ret == -1){
357
error(0, errno, "sigaction");
358
return EX_OSERR;
143
perror("sigaction");
144
return EXIT_FAILURE;
359
145
}
360
146
if(old_action.sa_handler != SIG_IGN){
361
147
ret = sigaction(SIGHUP, &new_action, NULL);
362
148
if(ret == -1){
363
error(0, errno, "sigaction");
364
return EX_OSERR;
149
perror("sigaction");
150
return EXIT_FAILURE;
365
151
}
366
152
}
367
153
ret = sigaction(SIGTERM, NULL, &old_action);
368
154
if(ret == -1){
369
error(0, errno, "sigaction");
370
return EX_OSERR;
155
perror("sigaction");
156
return EXIT_FAILURE;
371
157
}
372
158
if(old_action.sa_handler != SIG_IGN){
373
159
ret = sigaction(SIGTERM, &new_action, NULL);
374
160
if(ret == -1){
375
error(0, errno, "sigaction");
376
return EX_OSERR;
161
perror("sigaction");
162
return EXIT_FAILURE;
377
163
}
378
164
}
379
165
383
169
}
384
170
385
171
t_new = t_old;
386
t_new.c_lflag &= ~(tcflag_t)ECHO;
172
t_new.c_lflag &= ~ECHO;
387
173
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
388
int e = errno;
389
error(0, errno, "tcsetattr-echo");
390
switch(e){
391
case EBADF:
392
case ENOTTY:
393
return EX_UNAVAILABLE;
394
case EINVAL:
395
default:
396
return EX_OSERR;
397
}
174
perror("tcsetattr-echo");
175
return EXIT_FAILURE;
398
176
}
399
177
400
178
if(debug){
401
179
fprintf(stderr, "Waiting for input from stdin \n");
402
180
}
413
191
fprintf(stderr, "%s ", prefix);
414
192
}
415
193
{
416
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
417
const char *crypttarget = getenv("CRYPTTAB_NAME");
418
/* Before cryptsetup 1.1.0~rc2 */
419
if(cryptsource == NULL){
420
cryptsource = getenv("cryptsource");
421
}
422
if(crypttarget == NULL){
423
crypttarget = getenv("crypttarget");
424
}
425
const char *const prompt1 = "Unlocking the disk";
426
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";
427
198
if(cryptsource == NULL){
428
199
if(crypttarget == NULL){
429
fprintf(stderr, "%s to unlock the disk: ", prompt2);
200
fprintf(stderr, "%s: ", prompt);
430
201
} else {
431
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
432
prompt2);
202
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
433
203
}
434
204
} else {
435
205
if(crypttarget == NULL){
436
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
437
prompt2);
206
fprintf(stderr, "%s %s: ", prompt, cryptsource);
438
207
} else {
439
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
440
crypttarget, prompt2);
208
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
209
crypttarget);
441
210
}
442
211
}
443
212
}
444
sret = getline(&buffer, &n, stdin);
445
if(sret > 0){
213
ret = getline(&buffer, &n, stdin);
214
if(ret > 0){
446
215
status = EXIT_SUCCESS;
447
216
/* Make n = data size instead of allocated buffer size */
448
n = (size_t)sret;
217
n = (size_t)ret;
449
218
/* Strip final newline */
450
if(n > 0 and buffer[n-1] == '\n'){
219
if(n>0 and buffer[n-1] == '\n'){
451
220
buffer[n-1] = '\0'; /* not strictly necessary */
452
221
n--;
453
222
}
454
223
size_t written = 0;
455
224
while(written < n){
456
sret = write(STDOUT_FILENO, buffer + written, n - written);
457
if(sret < 0){
458
int e = errno;
459
error(0, errno, "write");
460
switch(e){
461
case EBADF:
462
case EFAULT:
463
case EINVAL:
464
case EFBIG:
465
case EIO:
466
case ENOSPC:
467
default:
468
status = EX_IOERR;
469
break;
470
case EINTR:
471
status = EXIT_FAILURE;
472
break;
473
}
474
break;
475
}
476
written += (size_t)sret;
477
}
478
sret = close(STDOUT_FILENO);
479
if(sret == -1){
480
int e = errno;
481
error(0, errno, "close");
482
switch(e){
483
case EBADF:
484
status = EX_OSFILE;
485
break;
486
case EIO:
487
default:
488
status = EX_IOERR;
489
break;
490
}
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;
491
232
}
492
233
break;
493
234
}
494
if(sret < 0){
495
int e = errno;
235
if(ret < 0){
496
236
if(errno != EINTR and not feof(stdin)){
497
error(0, errno, "getline");
498
switch(e){
499
case EBADF:
500
status = EX_UNAVAILABLE;
501
case EIO:
502
case EINVAL:
503
default:
504
status = EX_IOERR;
505
break;
506
}
237
perror("getline");
238
status = EXIT_FAILURE;
507
239
break;
508
240
}
509
241
}
510
/* if(sret == 0), then the only sensible thing to do is to retry
511
to read from stdin */
242
/* if(ret == 0), then the only sensible thing to do is to retry to
243
read from stdin */
512
244
fputc('\n', stderr);
513
if(debug and not quit_now){
245
if(debug and quit_now == 0){
514
246
/* If quit_now is nonzero, we were interrupted by a signal, and
515
247
will print that later, so no need to show this too. */
516
248
fprintf(stderr, "getline() returned 0, retrying.\n");
523
255
fprintf(stderr, "Restoring terminal attributes\n");
524
256
}
525
257
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
526
error(0, errno, "tcsetattr+echo");
527
}
528
529
if(quit_now){
530
sigemptyset(&old_action.sa_mask);
531
old_action.sa_handler = SIG_DFL;
532
ret = sigaction(signal_received, &old_action, NULL);
533
if(ret == -1){
534
error(0, errno, "sigaction");
535
}
536
raise(signal_received);
258
perror("tcsetattr+echo");
537
259
}
538
260
539
261
if(debug){
540
262
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
541
263
status);
542
264
}
543
if(status == EXIT_SUCCESS or status == EX_OK){
265
if(status == EXIT_SUCCESS){
544
266
fputc('\n', stderr);
545
267
}
546
268
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0