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- Committer: Teddy Hogeborn
- Date: 2009-02-25 01:31:13 UTC
- mto: (24.1.170 mandos) (237.4.29 release)
- mto: This revision was merged to the branch mainline in revision 324.
- Revision ID: teddy@fukt.bsnet.se-20090225013113-mzw86kzgqrhd9rfm
Tags: version-1.0.8-1
* Makefile (version): Changed to "1.0.8".
* NEWS (Version 1.0.8): New entry.
* debian/changelog (1.0.8-1): - '' -
* NEWS (Version 1.0.8): New entry.
* debian/changelog (1.0.8-1): - '' -
- 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
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
73
static void termination_handler(int signum){
74
if(quit_now){
75
return;
76
}
59
static void termination_handler(__attribute__((unused))int signum){
77
60
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
error(0, errno, "open");
115
return 0;
116
}
117
118
char *cmdline = NULL;
119
{
120
size_t cmdline_len = 0;
121
size_t cmdline_allocated = 0;
122
char *tmp;
123
const size_t blocksize = 1024;
124
ssize_t sret;
125
do {
126
/* Allocate more space? */
127
if(cmdline_len + blocksize + 1 > cmdline_allocated){
128
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
129
if(tmp == NULL){
130
error(0, errno, "realloc");
131
free(cmdline);
132
close(cl_fd);
133
return 0;
134
}
135
cmdline = tmp;
136
cmdline_allocated += blocksize;
137
}
138
139
/* Read data */
140
sret = read(cl_fd, cmdline + cmdline_len,
141
cmdline_allocated - cmdline_len);
142
if(sret == -1){
143
error(0, errno, "read");
144
free(cmdline);
145
close(cl_fd);
146
return 0;
147
}
148
cmdline_len += (size_t)sret;
149
} while(sret != 0);
150
ret = close(cl_fd);
151
if(ret == -1){
152
error(0, errno, "close");
153
free(cmdline);
154
return 0;
155
}
156
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
157
}
158
/* we now have cmdline */
159
160
/* get basename */
161
char *cmdline_base = strrchr(cmdline, '/');
162
if(cmdline_base != NULL){
163
cmdline_base += 1; /* skip the slash */
164
} else {
165
cmdline_base = cmdline;
166
}
167
168
if(strcmp(cmdline_base, plymouth_name) != 0){
169
if(debug){
170
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
171
plymouth_name);
172
}
173
free(cmdline);
174
return 0;
175
}
176
if(debug){
177
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
178
plymouth_name);
179
}
180
free(cmdline);
181
return 1;
182
}
183
184
struct dirent **direntries;
185
int ret;
186
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
187
if (ret == -1){
188
error(1, errno, "scandir");
189
}
190
return ret > 0;
191
}
192
61
}
193
62
194
63
int main(int argc, char **argv){
195
ssize_t sret;
196
int ret;
64
ssize_t ret;
197
65
size_t n;
198
66
struct termios t_new, t_old;
199
67
char *buffer = NULL;
209
77
.doc = "Prefix shown before the prompt", .group = 2 },
210
78
{ .name = "debug", .key = 128,
211
79
.doc = "Debug mode", .group = 3 },
212
/*
213
* These reproduce what we would get without ARGP_NO_HELP
214
*/
215
{ .name = "help", .key = '?',
216
.doc = "Give this help list", .group = -1 },
217
{ .name = "usage", .key = -3,
218
.doc = "Give a short usage message", .group = -1 },
219
{ .name = "version", .key = 'V',
220
.doc = "Print program version", .group = -1 },
221
80
{ .name = NULL }
222
81
};
223
82
224
83
error_t parse_opt (int key, char *arg, struct argp_state *state){
225
errno = 0;
226
84
switch (key){
227
85
case 'p':
228
86
prefix = arg;
230
88
case 128:
231
89
debug = true;
232
90
break;
233
/*
234
* These reproduce what we would get without ARGP_NO_HELP
235
*/
236
case '?': /* --help */
237
argp_state_help(state, state->out_stream,
238
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
239
& ~(unsigned int)ARGP_HELP_EXIT_OK);
240
case -3: /* --usage */
241
argp_state_help(state, state->out_stream,
242
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
243
case 'V': /* --version */
244
fprintf(state->out_stream, "%s\n", argp_program_version);
245
exit(argp_err_exit_status);
91
case ARGP_KEY_ARG:
92
argp_usage(state);
93
break;
94
case ARGP_KEY_END:
246
95
break;
247
96
default:
248
97
return ARGP_ERR_UNKNOWN;
249
98
}
250
return errno;
99
return 0;
251
100
}
252
101
253
102
struct argp argp = { .options = options, .parser = parse_opt,
254
103
.args_doc = "",
255
104
.doc = "Mandos password-prompt -- Read and"
256
105
" output a password" };
257
ret = argp_parse(&argp, argc, argv,
258
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
259
switch(ret){
260
case 0:
261
break;
262
case ENOMEM:
263
default:
264
errno = ret;
265
error(0, errno, "argp_parse");
266
return EX_OSERR;
267
case EINVAL:
268
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;
269
110
}
270
111
}
271
112
272
113
if(debug){
273
114
fprintf(stderr, "Starting %s\n", argv[0]);
274
115
}
275
276
if (conflict_detection()){
277
if(debug){
278
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
279
}
280
return EXIT_FAILURE;
281
}
282
283
116
if(debug){
284
117
fprintf(stderr, "Storing current terminal attributes\n");
285
118
}
286
119
287
120
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
288
int e = errno;
289
error(0, errno, "tcgetattr");
290
switch(e){
291
case EBADF:
292
case ENOTTY:
293
return EX_UNAVAILABLE;
294
default:
295
return EX_OSERR;
296
}
121
perror("tcgetattr");
122
return EXIT_FAILURE;
297
123
}
298
124
299
125
sigemptyset(&new_action.sa_mask);
300
ret = sigaddset(&new_action.sa_mask, SIGINT);
301
if(ret == -1){
302
error(0, errno, "sigaddset");
303
return EX_OSERR;
304
}
305
ret = sigaddset(&new_action.sa_mask, SIGHUP);
306
if(ret == -1){
307
error(0, errno, "sigaddset");
308
return EX_OSERR;
309
}
310
ret = sigaddset(&new_action.sa_mask, SIGTERM);
311
if(ret == -1){
312
error(0, errno, "sigaddset");
313
return EX_OSERR;
314
}
315
/* Need to check if the handler is SIG_IGN before handling:
316
| [[info:libc:Initial Signal Actions]] |
317
| [[info:libc:Basic Signal Handling]] |
318
*/
126
sigaddset(&new_action.sa_mask, SIGINT);
127
sigaddset(&new_action.sa_mask, SIGHUP);
128
sigaddset(&new_action.sa_mask, SIGTERM);
319
129
ret = sigaction(SIGINT, NULL, &old_action);
320
130
if(ret == -1){
321
error(0, errno, "sigaction");
322
return EX_OSERR;
131
perror("sigaction");
132
return EXIT_FAILURE;
323
133
}
324
134
if(old_action.sa_handler != SIG_IGN){
325
135
ret = sigaction(SIGINT, &new_action, NULL);
326
136
if(ret == -1){
327
error(0, errno, "sigaction");
328
return EX_OSERR;
137
perror("sigaction");
138
return EXIT_FAILURE;
329
139
}
330
140
}
331
141
ret = sigaction(SIGHUP, NULL, &old_action);
332
142
if(ret == -1){
333
error(0, errno, "sigaction");
334
return EX_OSERR;
143
perror("sigaction");
144
return EXIT_FAILURE;
335
145
}
336
146
if(old_action.sa_handler != SIG_IGN){
337
147
ret = sigaction(SIGHUP, &new_action, NULL);
338
148
if(ret == -1){
339
error(0, errno, "sigaction");
340
return EX_OSERR;
149
perror("sigaction");
150
return EXIT_FAILURE;
341
151
}
342
152
}
343
153
ret = sigaction(SIGTERM, NULL, &old_action);
344
154
if(ret == -1){
345
error(0, errno, "sigaction");
346
return EX_OSERR;
155
perror("sigaction");
156
return EXIT_FAILURE;
347
157
}
348
158
if(old_action.sa_handler != SIG_IGN){
349
159
ret = sigaction(SIGTERM, &new_action, NULL);
350
160
if(ret == -1){
351
error(0, errno, "sigaction");
352
return EX_OSERR;
161
perror("sigaction");
162
return EXIT_FAILURE;
353
163
}
354
164
}
355
165
359
169
}
360
170
361
171
t_new = t_old;
362
t_new.c_lflag &= ~(tcflag_t)ECHO;
172
t_new.c_lflag &= ~ECHO;
363
173
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
364
int e = errno;
365
error(0, errno, "tcsetattr-echo");
366
switch(e){
367
case EBADF:
368
case ENOTTY:
369
return EX_UNAVAILABLE;
370
case EINVAL:
371
default:
372
return EX_OSERR;
373
}
174
perror("tcsetattr-echo");
175
return EXIT_FAILURE;
374
176
}
375
177
376
178
if(debug){
377
179
fprintf(stderr, "Waiting for input from stdin \n");
378
180
}
389
191
fprintf(stderr, "%s ", prefix);
390
192
}
391
193
{
392
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
393
const char *crypttarget = getenv("CRYPTTAB_NAME");
394
/* Before cryptsetup 1.1.0~rc2 */
395
if(cryptsource == NULL){
396
cryptsource = getenv("cryptsource");
397
}
398
if(crypttarget == NULL){
399
crypttarget = getenv("crypttarget");
400
}
401
const char *const prompt1 = "Unlocking the disk";
402
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";
403
198
if(cryptsource == NULL){
404
199
if(crypttarget == NULL){
405
fprintf(stderr, "%s to unlock the disk: ", prompt2);
200
fprintf(stderr, "%s: ", prompt);
406
201
} else {
407
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
408
prompt2);
202
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
409
203
}
410
204
} else {
411
205
if(crypttarget == NULL){
412
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
413
prompt2);
206
fprintf(stderr, "%s %s: ", prompt, cryptsource);
414
207
} else {
415
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
416
crypttarget, prompt2);
208
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
209
crypttarget);
417
210
}
418
211
}
419
212
}
420
sret = getline(&buffer, &n, stdin);
421
if(sret > 0){
213
ret = getline(&buffer, &n, stdin);
214
if(ret > 0){
422
215
status = EXIT_SUCCESS;
423
216
/* Make n = data size instead of allocated buffer size */
424
n = (size_t)sret;
217
n = (size_t)ret;
425
218
/* Strip final newline */
426
if(n > 0 and buffer[n-1] == '\n'){
219
if(n>0 and buffer[n-1] == '\n'){
427
220
buffer[n-1] = '\0'; /* not strictly necessary */
428
221
n--;
429
222
}
430
223
size_t written = 0;
431
224
while(written < n){
432
sret = write(STDOUT_FILENO, buffer + written, n - written);
433
if(sret < 0){
434
int e = errno;
435
error(0, errno, "write");
436
switch(e){
437
case EBADF:
438
case EFAULT:
439
case EINVAL:
440
case EFBIG:
441
case EIO:
442
case ENOSPC:
443
default:
444
status = EX_IOERR;
445
break;
446
case EINTR:
447
status = EXIT_FAILURE;
448
break;
449
}
450
break;
451
}
452
written += (size_t)sret;
453
}
454
sret = close(STDOUT_FILENO);
455
if(sret == -1){
456
int e = errno;
457
error(0, errno, "close");
458
switch(e){
459
case EBADF:
460
status = EX_OSFILE;
461
break;
462
case EIO:
463
default:
464
status = EX_IOERR;
465
break;
466
}
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;
467
232
}
468
233
break;
469
234
}
470
if(sret < 0){
471
int e = errno;
235
if(ret < 0){
472
236
if(errno != EINTR and not feof(stdin)){
473
error(0, errno, "getline");
474
switch(e){
475
case EBADF:
476
status = EX_UNAVAILABLE;
477
case EIO:
478
case EINVAL:
479
default:
480
status = EX_IOERR;
481
break;
482
}
237
perror("getline");
238
status = EXIT_FAILURE;
483
239
break;
484
240
}
485
241
}
486
/* if(sret == 0), then the only sensible thing to do is to retry
487
to read from stdin */
242
/* if(ret == 0), then the only sensible thing to do is to retry to
243
read from stdin */
488
244
fputc('\n', stderr);
489
if(debug and not quit_now){
245
if(debug and quit_now == 0){
490
246
/* If quit_now is nonzero, we were interrupted by a signal, and
491
247
will print that later, so no need to show this too. */
492
248
fprintf(stderr, "getline() returned 0, retrying.\n");
499
255
fprintf(stderr, "Restoring terminal attributes\n");
500
256
}
501
257
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
502
error(0, errno, "tcsetattr+echo");
503
}
504
505
if(quit_now){
506
sigemptyset(&old_action.sa_mask);
507
old_action.sa_handler = SIG_DFL;
508
ret = sigaction(signal_received, &old_action, NULL);
509
if(ret == -1){
510
error(0, errno, "sigaction");
511
}
512
raise(signal_received);
258
perror("tcsetattr+echo");
513
259
}
514
260
515
261
if(debug){
516
262
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
517
263
status);
518
264
}
519
if(status == EXIT_SUCCESS or status == EX_OK){
265
if(status == EXIT_SUCCESS){
520
266
fputc('\n', stderr);
521
267
}
522
268
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