(root)/mandos/release
» Revision
237.2.155
(compared to revision 237.7.652)
: plugins.d/password-prompt.c
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- Committer: Teddy Hogeborn
- Date: 2009-10-22 00:05:01 UTC
- mto: (24.1.146 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 270.
- Revision ID: teddy@fukt.bsnet.se-20091022000501-g792e99q5g1wkyet
Merge from release branch.
- files added:
- initramfs-tools-hook-conf
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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 © 2008-2019 Teddy Hogeborn
6
* Copyright © 2008-2019 Björn Påhlsson
7
*
8
* This file is part of Mandos.
9
*
10
* Mandos is free software: you can redistribute it and/or modify it
11
* under the terms of the GNU General Public License as published by
12
* the Free Software Foundation, either version 3 of the License, or
13
* (at your option) any later version.
14
*
15
* Mandos is distributed in the hope that it will be useful, but
5
* Copyright © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 Björn Påhlsson
7
*
8
* This program is free software: you can redistribute it and/or
9
* modify it under the terms of the GNU General Public License as
10
* published by the Free Software Foundation, either version 3 of the
11
* License, or (at your option) any later version.
12
*
13
* This program is distributed in the hope that it will be useful, but
16
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
16
* General Public License for more details.
19
17
*
20
18
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
22
21
*
23
* Contact the authors at <mandos@recompile.se>.
22
* Contact the authors at <mandos@fukt.bsnet.se>.
24
23
*/
25
24
26
#define _GNU_SOURCE /* getline(), asprintf() */
25
#define _GNU_SOURCE /* getline() */
27
26
28
#include <termios.h> /* struct termios, tcsetattr(),
27
#include <termios.h> /* struct termios, tcsetattr(),
29
28
TCSAFLUSH, tcgetattr(), ECHO */
30
29
#include <unistd.h> /* struct termios, tcsetattr(),
31
30
STDIN_FILENO, TCSAFLUSH,
32
tcgetattr(), ECHO, readlink() */
31
tcgetattr(), ECHO */
33
32
#include <signal.h> /* sig_atomic_t, raise(), struct
34
33
sigaction, sigemptyset(),
35
34
sigaction(), sigaddset(), SIGINT,
36
35
SIGQUIT, SIGHUP, SIGTERM,
37
36
raise() */
38
37
#include <stddef.h> /* NULL, size_t, ssize_t */
39
#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
40
ssize_t, open() */
38
#include <sys/types.h> /* ssize_t */
41
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
42
getenv(), free() */
43
#include <dirent.h> /* scandir(), alphasort() */
40
getopt_long, getenv() */
44
41
#include <stdio.h> /* fprintf(), stderr, getline(),
45
stdin, feof(), fputc(), vfprintf(),
46
vasprintf() */
42
stdin, feof(), perror(), fputc(),
43
getopt_long */
47
44
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
48
45
EFAULT, EFBIG, EIO, ENOSPC, EINTR
49
46
*/
50
#include <error.h> /* error() */
51
47
#include <iso646.h> /* or, not */
52
48
#include <stdbool.h> /* bool, false, true */
53
#include <inttypes.h> /* strtoumax() */
54
#include <sys/stat.h> /* struct stat, lstat(), open() */
55
#include <string.h> /* strlen, rindex, memcmp, strerror()
56
*/
49
#include <string.h> /* strlen, rindex, strncmp, strcmp */
57
50
#include <argp.h> /* struct argp_option, struct
58
51
argp_state, struct argp,
59
52
argp_parse(), error_t,
61
54
ARGP_ERR_UNKNOWN */
62
55
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
63
56
EX_UNAVAILABLE, EX_IOERR, EX_OK */
64
#include <fcntl.h> /* open() */
65
#include <stdarg.h> /* va_list, va_start(), ... */
66
57
67
58
volatile sig_atomic_t quit_now = 0;
68
59
int signal_received;
69
60
bool debug = false;
70
61
const char *argp_program_version = "password-prompt " VERSION;
71
const char *argp_program_bug_address = "<mandos@recompile.se>";
72
73
/* Needed for conflict resolution */
74
const char plymouth_name[] = "plymouthd";
75
76
/* Function to use when printing errors */
77
__attribute__((format (gnu_printf, 3, 4)))
78
void error_plus(int status, int errnum, const char *formatstring,
79
...){
80
va_list ap;
81
char *text;
82
int ret;
83
84
va_start(ap, formatstring);
85
ret = vasprintf(&text, formatstring, ap);
86
if(ret == -1){
87
fprintf(stderr, "Mandos plugin %s: ",
88
program_invocation_short_name);
89
vfprintf(stderr, formatstring, ap);
90
fprintf(stderr, ": %s\n", strerror(errnum));
91
error(status, errno, "vasprintf while printing error");
92
return;
93
}
94
fprintf(stderr, "Mandos plugin ");
95
error(status, errnum, "%s", text);
96
free(text);
97
}
62
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
98
63
99
64
static void termination_handler(int signum){
100
65
if(quit_now){
104
69
signal_received = signum;
105
70
}
106
71
107
bool conflict_detection(void){
108
109
/* plymouth conflicts with password-prompt since both want to read
110
from the terminal. Password-prompt will exit if it detects
111
plymouth since plymouth performs the same functionality.
112
*/
113
__attribute__((nonnull))
114
int is_plymouth(const struct dirent *proc_entry){
115
int ret;
116
int cl_fd;
117
{
118
uintmax_t proc_id;
119
char *tmp;
120
errno = 0;
121
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
122
123
if(errno != 0 or *tmp != '\0'
124
or proc_id != (uintmax_t)((pid_t)proc_id)){
125
return 0;
126
}
127
}
128
129
char *cmdline_filename;
130
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
131
proc_entry->d_name);
132
if(ret == -1){
133
error_plus(0, errno, "asprintf");
134
return 0;
135
}
136
137
/* Open /proc/<pid>/cmdline */
138
cl_fd = open(cmdline_filename, O_RDONLY);
139
free(cmdline_filename);
140
if(cl_fd == -1){
141
if(errno != ENOENT){
142
error_plus(0, errno, "open");
143
}
144
return 0;
145
}
146
147
char *cmdline = NULL;
148
{
149
size_t cmdline_len = 0;
150
size_t cmdline_allocated = 0;
151
char *tmp;
152
const size_t blocksize = 1024;
153
ssize_t sret;
154
do {
155
/* Allocate more space? */
156
if(cmdline_len + blocksize + 1 > cmdline_allocated){
157
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
158
if(tmp == NULL){
159
error_plus(0, errno, "realloc");
160
free(cmdline);
161
close(cl_fd);
162
return 0;
163
}
164
cmdline = tmp;
165
cmdline_allocated += blocksize;
166
}
167
168
/* Read data */
169
sret = read(cl_fd, cmdline + cmdline_len,
170
cmdline_allocated - cmdline_len);
171
if(sret == -1){
172
error_plus(0, errno, "read");
173
free(cmdline);
174
close(cl_fd);
175
return 0;
176
}
177
cmdline_len += (size_t)sret;
178
} while(sret != 0);
179
ret = close(cl_fd);
180
if(ret == -1){
181
error_plus(0, errno, "close");
182
free(cmdline);
183
return 0;
184
}
185
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
186
}
187
/* we now have cmdline */
188
189
/* get basename */
190
char *cmdline_base = strrchr(cmdline, '/');
191
if(cmdline_base != NULL){
192
cmdline_base += 1; /* skip the slash */
193
} else {
194
cmdline_base = cmdline;
195
}
196
197
if(strcmp(cmdline_base, plymouth_name) != 0){
198
if(debug){
199
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
200
plymouth_name);
201
}
202
free(cmdline);
203
return 0;
204
}
205
if(debug){
206
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
207
plymouth_name);
208
}
209
free(cmdline);
210
return 1;
211
}
212
213
struct dirent **direntries = NULL;
214
int ret;
215
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
216
if(ret == -1){
217
error_plus(1, errno, "scandir");
218
}
219
{
220
int i = ret;
221
while(i--){
222
free(direntries[i]);
223
}
224
}
225
free(direntries);
226
return ret > 0;
227
}
228
229
230
72
int main(int argc, char **argv){
231
ssize_t sret;
232
int ret;
73
ssize_t ret;
233
74
size_t n;
234
75
struct termios t_new, t_old;
235
76
char *buffer = NULL;
245
86
.doc = "Prefix shown before the prompt", .group = 2 },
246
87
{ .name = "debug", .key = 128,
247
88
.doc = "Debug mode", .group = 3 },
248
/*
249
* These reproduce what we would get without ARGP_NO_HELP
250
*/
251
{ .name = "help", .key = '?',
252
.doc = "Give this help list", .group = -1 },
253
{ .name = "usage", .key = -3,
254
.doc = "Give a short usage message", .group = -1 },
255
{ .name = "version", .key = 'V',
256
.doc = "Print program version", .group = -1 },
257
89
{ .name = NULL }
258
90
};
259
91
260
__attribute__((nonnull(3)))
261
92
error_t parse_opt (int key, char *arg, struct argp_state *state){
262
errno = 0;
263
93
switch (key){
264
94
case 'p':
265
95
prefix = arg;
267
97
case 128:
268
98
debug = true;
269
99
break;
270
/*
271
* These reproduce what we would get without ARGP_NO_HELP
272
*/
273
case '?': /* --help */
274
argp_state_help(state, state->out_stream,
275
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
276
& ~(unsigned int)ARGP_HELP_EXIT_OK);
277
__builtin_unreachable();
278
case -3: /* --usage */
279
argp_state_help(state, state->out_stream,
280
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
281
__builtin_unreachable();
282
case 'V': /* --version */
283
fprintf(state->out_stream, "%s\n", argp_program_version);
284
exit(argp_err_exit_status);
100
case ARGP_KEY_ARG:
101
argp_usage(state);
102
break;
103
case ARGP_KEY_END:
285
104
break;
286
105
default:
287
106
return ARGP_ERR_UNKNOWN;
288
107
}
289
return errno;
108
return 0;
290
109
}
291
110
292
111
struct argp argp = { .options = options, .parser = parse_opt,
293
112
.args_doc = "",
294
113
.doc = "Mandos password-prompt -- Read and"
295
114
" output a password" };
296
ret = argp_parse(&argp, argc, argv,
297
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
298
switch(ret){
299
case 0:
300
break;
301
case ENOMEM:
302
default:
303
errno = ret;
304
error_plus(0, errno, "argp_parse");
305
return EX_OSERR;
306
case EINVAL:
307
return EX_USAGE;
115
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
116
if(ret == ARGP_ERR_UNKNOWN){
117
fprintf(stderr, "Unknown error while parsing arguments\n");
118
return EX_SOFTWARE;
308
119
}
309
120
}
310
121
311
122
if(debug){
312
123
fprintf(stderr, "Starting %s\n", argv[0]);
313
124
}
314
315
if(conflict_detection()){
316
if(debug){
317
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
318
}
319
return EXIT_FAILURE;
320
}
321
322
125
if(debug){
323
126
fprintf(stderr, "Storing current terminal attributes\n");
324
127
}
325
128
326
129
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
327
130
int e = errno;
328
error_plus(0, errno, "tcgetattr");
131
perror("tcgetattr");
329
132
switch(e){
330
133
case EBADF:
331
134
case ENOTTY:
338
141
sigemptyset(&new_action.sa_mask);
339
142
ret = sigaddset(&new_action.sa_mask, SIGINT);
340
143
if(ret == -1){
341
error_plus(0, errno, "sigaddset");
144
perror("sigaddset");
342
145
return EX_OSERR;
343
146
}
344
147
ret = sigaddset(&new_action.sa_mask, SIGHUP);
345
148
if(ret == -1){
346
error_plus(0, errno, "sigaddset");
149
perror("sigaddset");
347
150
return EX_OSERR;
348
151
}
349
152
ret = sigaddset(&new_action.sa_mask, SIGTERM);
350
153
if(ret == -1){
351
error_plus(0, errno, "sigaddset");
154
perror("sigaddset");
352
155
return EX_OSERR;
353
156
}
354
157
/* Need to check if the handler is SIG_IGN before handling:
357
160
*/
358
161
ret = sigaction(SIGINT, NULL, &old_action);
359
162
if(ret == -1){
360
error_plus(0, errno, "sigaction");
163
perror("sigaction");
361
164
return EX_OSERR;
362
165
}
363
166
if(old_action.sa_handler != SIG_IGN){
364
167
ret = sigaction(SIGINT, &new_action, NULL);
365
168
if(ret == -1){
366
error_plus(0, errno, "sigaction");
169
perror("sigaction");
367
170
return EX_OSERR;
368
171
}
369
172
}
370
173
ret = sigaction(SIGHUP, NULL, &old_action);
371
174
if(ret == -1){
372
error_plus(0, errno, "sigaction");
175
perror("sigaction");
373
176
return EX_OSERR;
374
177
}
375
178
if(old_action.sa_handler != SIG_IGN){
376
179
ret = sigaction(SIGHUP, &new_action, NULL);
377
180
if(ret == -1){
378
error_plus(0, errno, "sigaction");
181
perror("sigaction");
379
182
return EX_OSERR;
380
183
}
381
184
}
382
185
ret = sigaction(SIGTERM, NULL, &old_action);
383
186
if(ret == -1){
384
error_plus(0, errno, "sigaction");
187
perror("sigaction");
385
188
return EX_OSERR;
386
189
}
387
190
if(old_action.sa_handler != SIG_IGN){
388
191
ret = sigaction(SIGTERM, &new_action, NULL);
389
192
if(ret == -1){
390
error_plus(0, errno, "sigaction");
193
perror("sigaction");
391
194
return EX_OSERR;
392
195
}
393
196
}
401
204
t_new.c_lflag &= ~(tcflag_t)ECHO;
402
205
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
403
206
int e = errno;
404
error_plus(0, errno, "tcsetattr-echo");
207
perror("tcsetattr-echo");
405
208
switch(e){
406
209
case EBADF:
407
210
case ENOTTY:
428
231
fprintf(stderr, "%s ", prefix);
429
232
}
430
233
{
431
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
432
const char *crypttarget = getenv("CRYPTTAB_NAME");
433
/* Before cryptsetup 1.1.0~rc2 */
434
if(cryptsource == NULL){
435
cryptsource = getenv("cryptsource");
436
}
437
if(crypttarget == NULL){
438
crypttarget = getenv("crypttarget");
439
}
440
const char *const prompt1 = "Unlocking the disk";
441
const char *const prompt2 = "Enter passphrase";
234
const char *cryptsource = getenv("cryptsource");
235
const char *crypttarget = getenv("crypttarget");
236
const char *const prompt
237
= "Enter passphrase to unlock the disk";
442
238
if(cryptsource == NULL){
443
239
if(crypttarget == NULL){
444
fprintf(stderr, "%s to unlock the disk: ", prompt2);
240
fprintf(stderr, "%s: ", prompt);
445
241
} else {
446
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
447
prompt2);
242
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
448
243
}
449
244
} else {
450
245
if(crypttarget == NULL){
451
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
452
prompt2);
246
fprintf(stderr, "%s %s: ", prompt, cryptsource);
453
247
} else {
454
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
455
crypttarget, prompt2);
248
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
249
crypttarget);
456
250
}
457
251
}
458
252
}
459
sret = getline(&buffer, &n, stdin);
460
if(sret > 0){
253
ret = getline(&buffer, &n, stdin);
254
if(ret > 0){
461
255
status = EXIT_SUCCESS;
462
256
/* Make n = data size instead of allocated buffer size */
463
n = (size_t)sret;
257
n = (size_t)ret;
464
258
/* Strip final newline */
465
259
if(n > 0 and buffer[n-1] == '\n'){
466
260
buffer[n-1] = '\0'; /* not strictly necessary */
468
262
}
469
263
size_t written = 0;
470
264
while(written < n){
471
sret = write(STDOUT_FILENO, buffer + written, n - written);
472
if(sret < 0){
265
ret = write(STDOUT_FILENO, buffer + written, n - written);
266
if(ret < 0){
473
267
int e = errno;
474
error_plus(0, errno, "write");
268
perror("write");
475
269
switch(e){
476
270
case EBADF:
477
271
case EFAULT:
488
282
}
489
283
break;
490
284
}
491
written += (size_t)sret;
285
written += (size_t)ret;
492
286
}
493
sret = close(STDOUT_FILENO);
494
if(sret == -1){
287
ret = close(STDOUT_FILENO);
288
if(ret == -1){
495
289
int e = errno;
496
error_plus(0, errno, "close");
290
perror("close");
497
291
switch(e){
498
292
case EBADF:
499
293
status = EX_OSFILE;
506
300
}
507
301
break;
508
302
}
509
if(sret < 0){
303
if(ret < 0){
510
304
int e = errno;
511
305
if(errno != EINTR and not feof(stdin)){
512
error_plus(0, errno, "getline");
306
perror("getline");
513
307
switch(e){
514
308
case EBADF:
515
309
status = EX_UNAVAILABLE;
516
break;
517
310
case EIO:
518
311
case EINVAL:
519
312
default:
523
316
break;
524
317
}
525
318
}
526
/* if(sret == 0), then the only sensible thing to do is to retry
527
to read from stdin */
319
/* if(ret == 0), then the only sensible thing to do is to retry to
320
read from stdin */
528
321
fputc('\n', stderr);
529
322
if(debug and not quit_now){
530
323
/* If quit_now is nonzero, we were interrupted by a signal, and
539
332
fprintf(stderr, "Restoring terminal attributes\n");
540
333
}
541
334
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
542
error_plus(0, errno, "tcsetattr+echo");
335
perror("tcsetattr+echo");
543
336
}
544
337
545
338
if(quit_now){
547
340
old_action.sa_handler = SIG_DFL;
548
341
ret = sigaction(signal_received, &old_action, NULL);
549
342
if(ret == -1){
550
error_plus(0, errno, "sigaction");
343
perror("sigaction");
551
344
}
552
345
raise(signal_received);
553
346
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0