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- Committer: Teddy Hogeborn
- Date: 2009-02-05 02:33:05 UTC
- Revision ID: teddy@fukt.bsnet.se-20090205023305-o7rkhr55e7w4pe1m
* plugins.d/password-prompt.c (quit_now): Changed type to "volatile
sig_atomic_t". All uses changed.
sig_atomic_t". All uses changed.
- 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
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
54
volatile sig_atomic_t quit_now = 0;
65
int signal_received;
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
const char plymouth_alt_name[] = "plymouthd";
73
74
75
static void termination_handler(int signum){
76
if(quit_now){
77
return;
78
}
59
static void termination_handler(__attribute__((unused))int signum){
79
60
quit_now = 1;
80
signal_received = signum;
81
}
82
83
bool conflict_detection(void){
84
85
/* plymouth conflicts with password-prompt since both want to read
86
from the terminal. Password-prompt will exit if it detects
87
plymouth since plymouth performs the same functionality.
88
*/
89
int is_plymouth(const struct dirent *proc_entry){
90
int ret;
91
int cl_fd;
92
{
93
uintmax_t maxvalue;
94
char *tmp;
95
errno = 0;
96
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
97
98
if(errno != 0 or *tmp != '\0'
99
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
100
return 0;
101
}
102
}
103
104
char *cmdline_filename;
105
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline", proc_entry->d_name);
106
if(ret == -1){
107
error(0, errno, "asprintf");
108
return 0;
109
}
110
111
/* Open /proc/<pid>/cmdline */
112
cl_fd = open(cmdline_filename, O_RDONLY);
113
free(cmdline_filename);
114
if(cl_fd == -1){
115
error(0, errno, "open");
116
return 0;
117
}
118
119
char *cmdline = NULL;
120
{
121
size_t cmdline_len = 0;
122
size_t cmdline_allocated = 0;
123
char *tmp;
124
const size_t blocksize = 1024;
125
ssize_t sret;
126
do {
127
/* Allocate more space? */
128
if(cmdline_len + blocksize + 1 > cmdline_allocated){
129
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
130
if(tmp == NULL){
131
error(0, errno, "realloc");
132
free(cmdline);
133
close(cl_fd);
134
return 0;
135
}
136
cmdline = tmp;
137
cmdline_allocated += blocksize;
138
}
139
140
/* Read data */
141
sret = read(cl_fd, cmdline + cmdline_len,
142
cmdline_allocated - cmdline_len);
143
if(sret == -1){
144
error(0, errno, "read");
145
free(cmdline);
146
close(cl_fd);
147
return 0;
148
}
149
cmdline_len += (size_t)sret;
150
} while(sret != 0);
151
ret = close(cl_fd);
152
if(ret == -1){
153
error(0, errno, "close");
154
free(cmdline);
155
return 0;
156
}
157
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
158
}
159
/* we now have cmdline */
160
161
/* get basename */
162
char *cmdline_base = strrchr(cmdline, '/');
163
if(cmdline_base != NULL){
164
cmdline_base += 1; /* skip the slash */
165
} else {
166
cmdline_base = cmdline;
167
}
168
169
if((strcmp(cmdline_base, plymouth_name) != 0)
170
and (strcmp(cmdline_base, plymouth_alt_name) != 0)){
171
free(cmdline);
172
return 0;
173
}
174
free(cmdline);
175
return 1;
176
}
177
178
struct dirent **direntries;
179
int ret;
180
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
181
if (ret == -1){
182
error(1, errno, "scandir");
183
}
184
return ret > 0;
185
}
186
61
}
187
62
188
63
int main(int argc, char **argv){
189
ssize_t sret;
190
int ret;
64
ssize_t ret;
191
65
size_t n;
192
66
struct termios t_new, t_old;
193
67
char *buffer = NULL;
203
77
.doc = "Prefix shown before the prompt", .group = 2 },
204
78
{ .name = "debug", .key = 128,
205
79
.doc = "Debug mode", .group = 3 },
206
/*
207
* These reproduce what we would get without ARGP_NO_HELP
208
*/
209
{ .name = "help", .key = '?',
210
.doc = "Give this help list", .group = -1 },
211
{ .name = "usage", .key = -3,
212
.doc = "Give a short usage message", .group = -1 },
213
{ .name = "version", .key = 'V',
214
.doc = "Print program version", .group = -1 },
215
80
{ .name = NULL }
216
81
};
217
82
218
83
error_t parse_opt (int key, char *arg, struct argp_state *state){
219
errno = 0;
220
84
switch (key){
221
85
case 'p':
222
86
prefix = arg;
224
88
case 128:
225
89
debug = true;
226
90
break;
227
/*
228
* These reproduce what we would get without ARGP_NO_HELP
229
*/
230
case '?': /* --help */
231
argp_state_help(state, state->out_stream,
232
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
233
& ~(unsigned int)ARGP_HELP_EXIT_OK);
234
case -3: /* --usage */
235
argp_state_help(state, state->out_stream,
236
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
237
case 'V': /* --version */
238
fprintf(state->out_stream, "%s\n", argp_program_version);
239
exit(argp_err_exit_status);
91
case ARGP_KEY_ARG:
92
argp_usage(state);
93
break;
94
case ARGP_KEY_END:
240
95
break;
241
96
default:
242
97
return ARGP_ERR_UNKNOWN;
243
98
}
244
return errno;
99
return 0;
245
100
}
246
101
247
102
struct argp argp = { .options = options, .parser = parse_opt,
248
103
.args_doc = "",
249
104
.doc = "Mandos password-prompt -- Read and"
250
105
" output a password" };
251
ret = argp_parse(&argp, argc, argv,
252
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
253
switch(ret){
254
case 0:
255
break;
256
case ENOMEM:
257
default:
258
errno = ret;
259
error(0, errno, "argp_parse");
260
return EX_OSERR;
261
case EINVAL:
262
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;
263
110
}
264
111
}
265
112
266
113
if(debug){
267
114
fprintf(stderr, "Starting %s\n", argv[0]);
268
115
}
269
270
if (conflict_detection()){
271
if(debug){
272
fprintf(stderr, "Stopping %s because of conflict", argv[0]);
273
}
274
return EXIT_FAILURE;
275
}
276
277
116
if(debug){
278
117
fprintf(stderr, "Storing current terminal attributes\n");
279
118
}
280
119
281
120
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
282
int e = errno;
283
error(0, errno, "tcgetattr");
284
switch(e){
285
case EBADF:
286
case ENOTTY:
287
return EX_UNAVAILABLE;
288
default:
289
return EX_OSERR;
290
}
121
perror("tcgetattr");
122
return EXIT_FAILURE;
291
123
}
292
124
293
125
sigemptyset(&new_action.sa_mask);
294
ret = sigaddset(&new_action.sa_mask, SIGINT);
295
if(ret == -1){
296
error(0, errno, "sigaddset");
297
return EX_OSERR;
298
}
299
ret = sigaddset(&new_action.sa_mask, SIGHUP);
300
if(ret == -1){
301
error(0, errno, "sigaddset");
302
return EX_OSERR;
303
}
304
ret = sigaddset(&new_action.sa_mask, SIGTERM);
305
if(ret == -1){
306
error(0, errno, "sigaddset");
307
return EX_OSERR;
308
}
309
/* Need to check if the handler is SIG_IGN before handling:
310
| [[info:libc:Initial Signal Actions]] |
311
| [[info:libc:Basic Signal Handling]] |
312
*/
126
sigaddset(&new_action.sa_mask, SIGINT);
127
sigaddset(&new_action.sa_mask, SIGHUP);
128
sigaddset(&new_action.sa_mask, SIGTERM);
313
129
ret = sigaction(SIGINT, NULL, &old_action);
314
130
if(ret == -1){
315
error(0, errno, "sigaction");
316
return EX_OSERR;
131
perror("sigaction");
132
return EXIT_FAILURE;
317
133
}
318
134
if(old_action.sa_handler != SIG_IGN){
319
135
ret = sigaction(SIGINT, &new_action, NULL);
320
136
if(ret == -1){
321
error(0, errno, "sigaction");
322
return EX_OSERR;
137
perror("sigaction");
138
return EXIT_FAILURE;
323
139
}
324
140
}
325
141
ret = sigaction(SIGHUP, NULL, &old_action);
326
142
if(ret == -1){
327
error(0, errno, "sigaction");
328
return EX_OSERR;
143
perror("sigaction");
144
return EXIT_FAILURE;
329
145
}
330
146
if(old_action.sa_handler != SIG_IGN){
331
147
ret = sigaction(SIGHUP, &new_action, NULL);
332
148
if(ret == -1){
333
error(0, errno, "sigaction");
334
return EX_OSERR;
149
perror("sigaction");
150
return EXIT_FAILURE;
335
151
}
336
152
}
337
153
ret = sigaction(SIGTERM, NULL, &old_action);
338
154
if(ret == -1){
339
error(0, errno, "sigaction");
340
return EX_OSERR;
155
perror("sigaction");
156
return EXIT_FAILURE;
341
157
}
342
158
if(old_action.sa_handler != SIG_IGN){
343
159
ret = sigaction(SIGTERM, &new_action, NULL);
344
160
if(ret == -1){
345
error(0, errno, "sigaction");
346
return EX_OSERR;
161
perror("sigaction");
162
return EXIT_FAILURE;
347
163
}
348
164
}
349
165
353
169
}
354
170
355
171
t_new = t_old;
356
t_new.c_lflag &= ~(tcflag_t)ECHO;
172
t_new.c_lflag &= ~ECHO;
357
173
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
358
int e = errno;
359
error(0, errno, "tcsetattr-echo");
360
switch(e){
361
case EBADF:
362
case ENOTTY:
363
return EX_UNAVAILABLE;
364
case EINVAL:
365
default:
366
return EX_OSERR;
367
}
174
perror("tcsetattr-echo");
175
return EXIT_FAILURE;
368
176
}
369
177
370
178
if(debug){
371
179
fprintf(stderr, "Waiting for input from stdin \n");
372
180
}
383
191
fprintf(stderr, "%s ", prefix);
384
192
}
385
193
{
386
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
387
const char *crypttarget = getenv("CRYPTTAB_NAME");
388
/* Before cryptsetup 1.1.0~rc2 */
389
if(cryptsource == NULL){
390
cryptsource = getenv("cryptsource");
391
}
392
if(crypttarget == NULL){
393
crypttarget = getenv("crypttarget");
394
}
395
const char *const prompt1 = "Unlocking the disk";
396
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";
397
198
if(cryptsource == NULL){
398
199
if(crypttarget == NULL){
399
fprintf(stderr, "%s to unlock the disk: ", prompt2);
200
fprintf(stderr, "%s: ", prompt);
400
201
} else {
401
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
402
prompt2);
202
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
403
203
}
404
204
} else {
405
205
if(crypttarget == NULL){
406
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
407
prompt2);
206
fprintf(stderr, "%s %s: ", prompt, cryptsource);
408
207
} else {
409
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
410
crypttarget, prompt2);
208
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
209
crypttarget);
411
210
}
412
211
}
413
212
}
414
sret = getline(&buffer, &n, stdin);
415
if(sret > 0){
213
ret = getline(&buffer, &n, stdin);
214
if(ret > 0){
416
215
status = EXIT_SUCCESS;
417
216
/* Make n = data size instead of allocated buffer size */
418
n = (size_t)sret;
217
n = (size_t)ret;
419
218
/* Strip final newline */
420
if(n > 0 and buffer[n-1] == '\n'){
219
if(n>0 and buffer[n-1] == '\n'){
421
220
buffer[n-1] = '\0'; /* not strictly necessary */
422
221
n--;
423
222
}
424
223
size_t written = 0;
425
224
while(written < n){
426
sret = write(STDOUT_FILENO, buffer + written, n - written);
427
if(sret < 0){
428
int e = errno;
429
error(0, errno, "write");
430
switch(e){
431
case EBADF:
432
case EFAULT:
433
case EINVAL:
434
case EFBIG:
435
case EIO:
436
case ENOSPC:
437
default:
438
status = EX_IOERR;
439
break;
440
case EINTR:
441
status = EXIT_FAILURE;
442
break;
443
}
444
break;
445
}
446
written += (size_t)sret;
447
}
448
sret = close(STDOUT_FILENO);
449
if(sret == -1){
450
int e = errno;
451
error(0, errno, "close");
452
switch(e){
453
case EBADF:
454
status = EX_OSFILE;
455
break;
456
case EIO:
457
default:
458
status = EX_IOERR;
459
break;
460
}
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;
461
232
}
462
233
break;
463
234
}
464
if(sret < 0){
465
int e = errno;
235
if(ret < 0){
466
236
if(errno != EINTR and not feof(stdin)){
467
error(0, errno, "getline");
468
switch(e){
469
case EBADF:
470
status = EX_UNAVAILABLE;
471
case EIO:
472
case EINVAL:
473
default:
474
status = EX_IOERR;
475
break;
476
}
237
perror("getline");
238
status = EXIT_FAILURE;
477
239
break;
478
240
}
479
241
}
480
/* if(sret == 0), then the only sensible thing to do is to retry to
242
/* if(ret == 0), then the only sensible thing to do is to retry to
481
243
read from stdin */
482
244
fputc('\n', stderr);
483
if(debug and not quit_now){
245
if(debug and quit_now == 0){
484
246
/* If quit_now is nonzero, we were interrupted by a signal, and
485
247
will print that later, so no need to show this too. */
486
248
fprintf(stderr, "getline() returned 0, retrying.\n");
493
255
fprintf(stderr, "Restoring terminal attributes\n");
494
256
}
495
257
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
496
error(0, errno, "tcsetattr+echo");
497
}
498
499
if(quit_now){
500
sigemptyset(&old_action.sa_mask);
501
old_action.sa_handler = SIG_DFL;
502
ret = sigaction(signal_received, &old_action, NULL);
503
if(ret == -1){
504
error(0, errno, "sigaction");
505
}
506
raise(signal_received);
258
perror("tcsetattr+echo");
507
259
}
508
260
509
261
if(debug){
510
262
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
511
263
status);
512
264
}
513
if(status == EXIT_SUCCESS or status == EX_OK){
265
if(status == EXIT_SUCCESS){
514
266
fputc('\n', stderr);
515
267
}
516
268
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