To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to plugins.d/password-prompt.c
- browse files at revision 221
- compare with another revision
- download diff
- download tarball
- view history from revision 221
- Committer: Teddy Hogeborn
- Date: 2008-10-01 15:29:01 UTC
- Revision ID: teddy@fukt.bsnet.se-20081001152901-fh30whl3m4vb7m24
* debian/changelog: New Debian revision.
* debian/mandos-client.lintian-overrides: Added comments.
* debian/mandos.lintian-overrides: - '' -
* debian/mandos-client.lintian-overrides: Added comments.
* debian/mandos.lintian-overrides: - '' -
- files added:
- debian/mandos-client.config
- files removed:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- 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
* Password-prompt - Read a password from the terminal and print it
4
*
5
* Copyright © 2008-2017 Teddy Hogeborn
6
* Copyright © 2008-2017 Björn Påhlsson
3
* Passprompt - Read a password from the terminal and print it
4
*
5
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
7
6
*
8
7
* This program is free software: you can redistribute it and/or
9
8
* modify it under the terms of the GNU General Public License as
19
18
* along with this program. If not, see
20
19
* <http://www.gnu.org/licenses/>.
21
20
*
22
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
23
23
*/
24
24
25
#define _GNU_SOURCE /* getline(), asprintf() */
25
#define _GNU_SOURCE /* getline() */
26
26
27
#include <termios.h> /* struct termios, tcsetattr(),
27
#include <termios.h> /* struct termios, tcsetattr(),
28
28
TCSAFLUSH, tcgetattr(), ECHO */
29
29
#include <unistd.h> /* struct termios, tcsetattr(),
30
30
STDIN_FILENO, TCSAFLUSH,
31
tcgetattr(), ECHO, readlink() */
31
tcgetattr(), ECHO */
32
32
#include <signal.h> /* sig_atomic_t, raise(), struct
33
33
sigaction, sigemptyset(),
34
34
sigaction(), sigaddset(), SIGINT,
35
SIGQUIT, SIGHUP, SIGTERM,
36
raise() */
35
SIGQUIT, SIGHUP, SIGTERM */
37
36
#include <stddef.h> /* NULL, size_t, ssize_t */
38
#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
39
ssize_t, open() */
37
#include <sys/types.h> /* ssize_t */
40
38
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
41
getenv(), free() */
42
#include <dirent.h> /* scandir(), alphasort() */
39
getopt_long, getenv() */
43
40
#include <stdio.h> /* fprintf(), stderr, getline(),
44
stdin, feof(), fputc(), vfprintf(),
45
vasprintf() */
46
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
47
EFAULT, EFBIG, EIO, ENOSPC, EINTR
48
*/
49
#include <error.h> /* error() */
41
stdin, feof(), perror(), fputc(),
42
stdout, getopt_long */
43
#include <errno.h> /* errno, EINVAL */
50
44
#include <iso646.h> /* or, not */
51
45
#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()
55
*/
46
#include <string.h> /* strlen, rindex, strncmp, strcmp */
56
47
#include <argp.h> /* struct argp_option, struct
57
48
argp_state, struct argp,
58
49
argp_parse(), error_t,
59
50
ARGP_KEY_ARG, ARGP_KEY_END,
60
51
ARGP_ERR_UNKNOWN */
61
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
62
EX_UNAVAILABLE, EX_IOERR, EX_OK */
63
#include <fcntl.h> /* open() */
64
#include <stdarg.h> /* va_list, va_start(), ... */
65
52
66
volatile sig_atomic_t quit_now = 0;
67
int signal_received;
53
volatile bool quit_now = false;
68
54
bool debug = false;
69
55
const char *argp_program_version = "password-prompt " VERSION;
70
const char *argp_program_bug_address = "<mandos@recompile.se>";
71
72
/* Needed for conflict resolution */
73
const char plymouth_name[] = "plymouthd";
74
75
/* Function to use when printing errors */
76
__attribute__((format (gnu_printf, 3, 4)))
77
void error_plus(int status, int errnum, const char *formatstring,
78
...){
79
va_list ap;
80
char *text;
81
int ret;
82
83
va_start(ap, formatstring);
84
ret = vasprintf(&text, formatstring, ap);
85
if(ret == -1){
86
fprintf(stderr, "Mandos plugin %s: ",
87
program_invocation_short_name);
88
vfprintf(stderr, formatstring, ap);
89
fprintf(stderr, ": %s\n", strerror(errnum));
90
error(status, errno, "vasprintf while printing error");
91
return;
92
}
93
fprintf(stderr, "Mandos plugin ");
94
error(status, errnum, "%s", text);
95
free(text);
96
}
97
98
static void termination_handler(int signum){
99
if(quit_now){
100
return;
101
}
102
quit_now = 1;
103
signal_received = signum;
104
}
105
106
bool conflict_detection(void){
107
108
/* plymouth conflicts with password-prompt since both want to read
109
from the terminal. Password-prompt will exit if it detects
110
plymouth since plymouth performs the same functionality.
111
*/
112
__attribute__((nonnull))
113
int is_plymouth(const struct dirent *proc_entry){
114
int ret;
115
int cl_fd;
116
{
117
uintmax_t proc_id;
118
char *tmp;
119
errno = 0;
120
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
121
122
if(errno != 0 or *tmp != '\0'
123
or proc_id != (uintmax_t)((pid_t)proc_id)){
124
return 0;
125
}
126
}
127
128
char *cmdline_filename;
129
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
130
proc_entry->d_name);
131
if(ret == -1){
132
error_plus(0, errno, "asprintf");
133
return 0;
134
}
135
136
/* Open /proc/<pid>/cmdline */
137
cl_fd = open(cmdline_filename, O_RDONLY);
138
free(cmdline_filename);
139
if(cl_fd == -1){
140
if(errno != ENOENT){
141
error_plus(0, errno, "open");
142
}
143
return 0;
144
}
145
146
char *cmdline = NULL;
147
{
148
size_t cmdline_len = 0;
149
size_t cmdline_allocated = 0;
150
char *tmp;
151
const size_t blocksize = 1024;
152
ssize_t sret;
153
do {
154
/* Allocate more space? */
155
if(cmdline_len + blocksize + 1 > cmdline_allocated){
156
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
157
if(tmp == NULL){
158
error_plus(0, errno, "realloc");
159
free(cmdline);
160
close(cl_fd);
161
return 0;
162
}
163
cmdline = tmp;
164
cmdline_allocated += blocksize;
165
}
166
167
/* Read data */
168
sret = read(cl_fd, cmdline + cmdline_len,
169
cmdline_allocated - cmdline_len);
170
if(sret == -1){
171
error_plus(0, errno, "read");
172
free(cmdline);
173
close(cl_fd);
174
return 0;
175
}
176
cmdline_len += (size_t)sret;
177
} while(sret != 0);
178
ret = close(cl_fd);
179
if(ret == -1){
180
error_plus(0, errno, "close");
181
free(cmdline);
182
return 0;
183
}
184
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
185
}
186
/* we now have cmdline */
187
188
/* get basename */
189
char *cmdline_base = strrchr(cmdline, '/');
190
if(cmdline_base != NULL){
191
cmdline_base += 1; /* skip the slash */
192
} else {
193
cmdline_base = cmdline;
194
}
195
196
if(strcmp(cmdline_base, plymouth_name) != 0){
197
if(debug){
198
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
199
plymouth_name);
200
}
201
free(cmdline);
202
return 0;
203
}
204
if(debug){
205
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
206
plymouth_name);
207
}
208
free(cmdline);
209
return 1;
210
}
211
212
struct dirent **direntries = NULL;
213
int ret;
214
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
215
if(ret == -1){
216
error_plus(1, errno, "scandir");
217
}
218
{
219
int i = ret;
220
while(i--){
221
free(direntries[i]);
222
}
223
}
224
free(direntries);
225
return ret > 0;
226
}
227
56
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
57
58
static void termination_handler(__attribute__((unused))int signum){
59
quit_now = true;
60
}
228
61
229
62
int main(int argc, char **argv){
230
ssize_t sret;
231
int ret;
63
ssize_t ret;
232
64
size_t n;
233
65
struct termios t_new, t_old;
234
66
char *buffer = NULL;
244
76
.doc = "Prefix shown before the prompt", .group = 2 },
245
77
{ .name = "debug", .key = 128,
246
78
.doc = "Debug mode", .group = 3 },
247
/*
248
* These reproduce what we would get without ARGP_NO_HELP
249
*/
250
{ .name = "help", .key = '?',
251
.doc = "Give this help list", .group = -1 },
252
{ .name = "usage", .key = -3,
253
.doc = "Give a short usage message", .group = -1 },
254
{ .name = "version", .key = 'V',
255
.doc = "Print program version", .group = -1 },
256
79
{ .name = NULL }
257
80
};
258
259
__attribute__((nonnull(3)))
260
error_t parse_opt (int key, char *arg, struct argp_state *state){
261
errno = 0;
262
switch (key){
81
82
error_t parse_opt (int key, char *arg, struct argp_state *state) {
83
/* Get the INPUT argument from `argp_parse', which we know is a
84
pointer to our plugin list pointer. */
85
switch (key) {
263
86
case 'p':
264
87
prefix = arg;
265
88
break;
266
89
case 128:
267
90
debug = true;
268
91
break;
269
/*
270
* These reproduce what we would get without ARGP_NO_HELP
271
*/
272
case '?': /* --help */
273
argp_state_help(state, state->out_stream,
274
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
275
& ~(unsigned int)ARGP_HELP_EXIT_OK);
276
case -3: /* --usage */
277
argp_state_help(state, state->out_stream,
278
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
279
case 'V': /* --version */
280
fprintf(state->out_stream, "%s\n", argp_program_version);
281
exit(argp_err_exit_status);
92
case ARGP_KEY_ARG:
93
argp_usage (state);
94
break;
95
case ARGP_KEY_END:
282
96
break;
283
97
default:
284
98
return ARGP_ERR_UNKNOWN;
285
99
}
286
return errno;
100
return 0;
287
101
}
288
102
289
103
struct argp argp = { .options = options, .parser = parse_opt,
290
104
.args_doc = "",
291
105
.doc = "Mandos password-prompt -- Read and"
292
106
" output a password" };
293
ret = argp_parse(&argp, argc, argv,
294
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
295
switch(ret){
296
case 0:
297
break;
298
case ENOMEM:
299
default:
300
errno = ret;
301
error_plus(0, errno, "argp_parse");
302
return EX_OSERR;
303
case EINVAL:
304
return EX_USAGE;
107
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
108
if (ret == ARGP_ERR_UNKNOWN){
109
fprintf(stderr, "Unknown error while parsing arguments\n");
110
return EXIT_FAILURE;
305
111
}
306
112
}
307
308
if(debug){
113
114
if (debug){
309
115
fprintf(stderr, "Starting %s\n", argv[0]);
310
116
}
311
312
if(conflict_detection()){
313
if(debug){
314
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
315
}
316
return EXIT_FAILURE;
317
}
318
319
if(debug){
117
if (debug){
320
118
fprintf(stderr, "Storing current terminal attributes\n");
321
119
}
322
120
323
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
324
int e = errno;
325
error_plus(0, errno, "tcgetattr");
326
switch(e){
327
case EBADF:
328
case ENOTTY:
329
return EX_UNAVAILABLE;
330
default:
331
return EX_OSERR;
332
}
121
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
122
perror("tcgetattr");
123
return EXIT_FAILURE;
333
124
}
334
125
335
126
sigemptyset(&new_action.sa_mask);
336
ret = sigaddset(&new_action.sa_mask, SIGINT);
337
if(ret == -1){
338
error_plus(0, errno, "sigaddset");
339
return EX_OSERR;
340
}
341
ret = sigaddset(&new_action.sa_mask, SIGHUP);
342
if(ret == -1){
343
error_plus(0, errno, "sigaddset");
344
return EX_OSERR;
345
}
346
ret = sigaddset(&new_action.sa_mask, SIGTERM);
347
if(ret == -1){
348
error_plus(0, errno, "sigaddset");
349
return EX_OSERR;
350
}
351
/* Need to check if the handler is SIG_IGN before handling:
352
| [[info:libc:Initial Signal Actions]] |
353
| [[info:libc:Basic Signal Handling]] |
354
*/
127
sigaddset(&new_action.sa_mask, SIGINT);
128
sigaddset(&new_action.sa_mask, SIGHUP);
129
sigaddset(&new_action.sa_mask, SIGTERM);
355
130
ret = sigaction(SIGINT, NULL, &old_action);
356
131
if(ret == -1){
357
error_plus(0, errno, "sigaction");
358
return EX_OSERR;
132
perror("sigaction");
133
return EXIT_FAILURE;
359
134
}
360
if(old_action.sa_handler != SIG_IGN){
135
if (old_action.sa_handler != SIG_IGN){
361
136
ret = sigaction(SIGINT, &new_action, NULL);
362
137
if(ret == -1){
363
error_plus(0, errno, "sigaction");
364
return EX_OSERR;
138
perror("sigaction");
139
return EXIT_FAILURE;
365
140
}
366
141
}
367
142
ret = sigaction(SIGHUP, NULL, &old_action);
368
143
if(ret == -1){
369
error_plus(0, errno, "sigaction");
370
return EX_OSERR;
144
perror("sigaction");
145
return EXIT_FAILURE;
371
146
}
372
if(old_action.sa_handler != SIG_IGN){
147
if (old_action.sa_handler != SIG_IGN){
373
148
ret = sigaction(SIGHUP, &new_action, NULL);
374
149
if(ret == -1){
375
error_plus(0, errno, "sigaction");
376
return EX_OSERR;
150
perror("sigaction");
151
return EXIT_FAILURE;
377
152
}
378
153
}
379
154
ret = sigaction(SIGTERM, NULL, &old_action);
380
155
if(ret == -1){
381
error_plus(0, errno, "sigaction");
382
return EX_OSERR;
156
perror("sigaction");
157
return EXIT_FAILURE;
383
158
}
384
if(old_action.sa_handler != SIG_IGN){
159
if (old_action.sa_handler != SIG_IGN){
385
160
ret = sigaction(SIGTERM, &new_action, NULL);
386
161
if(ret == -1){
387
error_plus(0, errno, "sigaction");
388
return EX_OSERR;
162
perror("sigaction");
163
return EXIT_FAILURE;
389
164
}
390
165
}
391
166
392
167
393
if(debug){
168
if (debug){
394
169
fprintf(stderr, "Removing echo flag from terminal attributes\n");
395
170
}
396
171
397
172
t_new = t_old;
398
t_new.c_lflag &= ~(tcflag_t)ECHO;
399
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
400
int e = errno;
401
error_plus(0, errno, "tcsetattr-echo");
402
switch(e){
403
case EBADF:
404
case ENOTTY:
405
return EX_UNAVAILABLE;
406
case EINVAL:
407
default:
408
return EX_OSERR;
409
}
173
t_new.c_lflag &= ~ECHO;
174
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
175
perror("tcsetattr-echo");
176
return EXIT_FAILURE;
410
177
}
411
412
if(debug){
178
179
if (debug){
413
180
fprintf(stderr, "Waiting for input from stdin \n");
414
181
}
415
182
while(true){
416
if(quit_now){
183
if (quit_now){
417
184
if(debug){
418
185
fprintf(stderr, "Interrupted by signal, exiting.\n");
419
186
}
425
192
fprintf(stderr, "%s ", prefix);
426
193
}
427
194
{
428
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
429
const char *crypttarget = getenv("CRYPTTAB_NAME");
430
/* Before cryptsetup 1.1.0~rc2 */
431
if(cryptsource == NULL){
432
cryptsource = getenv("cryptsource");
433
}
434
if(crypttarget == NULL){
435
crypttarget = getenv("crypttarget");
436
}
437
const char *const prompt1 = "Unlocking the disk";
438
const char *const prompt2 = "Enter passphrase";
195
const char *cryptsource = getenv("cryptsource");
196
const char *crypttarget = getenv("crypttarget");
197
const char *const prompt
198
= "Enter passphrase to unlock the disk";
439
199
if(cryptsource == NULL){
440
200
if(crypttarget == NULL){
441
fprintf(stderr, "%s to unlock the disk: ", prompt2);
201
fprintf(stderr, "%s: ", prompt);
442
202
} else {
443
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
444
prompt2);
203
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
445
204
}
446
205
} else {
447
206
if(crypttarget == NULL){
448
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
449
prompt2);
207
fprintf(stderr, "%s %s: ", prompt, cryptsource);
450
208
} else {
451
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
452
crypttarget, prompt2);
209
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
210
crypttarget);
453
211
}
454
212
}
455
213
}
456
sret = getline(&buffer, &n, stdin);
457
if(sret > 0){
214
ret = getline(&buffer, &n, stdin);
215
if (ret > 0){
458
216
status = EXIT_SUCCESS;
459
217
/* Make n = data size instead of allocated buffer size */
460
n = (size_t)sret;
218
n = (size_t)ret;
461
219
/* Strip final newline */
462
if(n > 0 and buffer[n-1] == '\n'){
220
if(n>0 and buffer[n-1] == '\n'){
463
221
buffer[n-1] = '\0'; /* not strictly necessary */
464
222
n--;
465
223
}
466
224
size_t written = 0;
467
225
while(written < n){
468
sret = write(STDOUT_FILENO, buffer + written, n - written);
469
if(sret < 0){
470
int e = errno;
471
error_plus(0, errno, "write");
472
switch(e){
473
case EBADF:
474
case EFAULT:
475
case EINVAL:
476
case EFBIG:
477
case EIO:
478
case ENOSPC:
479
default:
480
status = EX_IOERR;
481
break;
482
case EINTR:
483
status = EXIT_FAILURE;
484
break;
485
}
486
break;
487
}
488
written += (size_t)sret;
489
}
490
sret = close(STDOUT_FILENO);
491
if(sret == -1){
492
int e = errno;
493
error_plus(0, errno, "close");
494
switch(e){
495
case EBADF:
496
status = EX_OSFILE;
497
break;
498
case EIO:
499
default:
500
status = EX_IOERR;
501
break;
502
}
226
ret = write(STDOUT_FILENO, buffer + written, n - written);
227
if(ret < 0){
228
perror("write");
229
status = EXIT_FAILURE;
230
break;
231
}
232
written += (size_t)ret;
503
233
}
504
234
break;
505
235
}
506
if(sret < 0){
507
int e = errno;
508
if(errno != EINTR and not feof(stdin)){
509
error_plus(0, errno, "getline");
510
switch(e){
511
case EBADF:
512
status = EX_UNAVAILABLE;
513
break;
514
case EIO:
515
case EINVAL:
516
default:
517
status = EX_IOERR;
518
break;
519
}
236
if (ret < 0){
237
if (errno != EINTR and not feof(stdin)){
238
perror("getline");
239
status = EXIT_FAILURE;
520
240
break;
521
241
}
522
242
}
523
/* if(sret == 0), then the only sensible thing to do is to retry
524
to read from stdin */
243
/* if(ret == 0), then the only sensible thing to do is to retry to
244
read from stdin */
525
245
fputc('\n', stderr);
526
246
if(debug and not quit_now){
527
/* If quit_now is nonzero, we were interrupted by a signal, and
247
/* If quit_now is true, we were interrupted by a signal, and
528
248
will print that later, so no need to show this too. */
529
249
fprintf(stderr, "getline() returned 0, retrying.\n");
530
250
}
531
251
}
532
252
533
253
free(buffer);
534
254
535
if(debug){
255
if (debug){
536
256
fprintf(stderr, "Restoring terminal attributes\n");
537
257
}
538
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
539
error_plus(0, errno, "tcsetattr+echo");
540
}
541
542
if(quit_now){
543
sigemptyset(&old_action.sa_mask);
544
old_action.sa_handler = SIG_DFL;
545
ret = sigaction(signal_received, &old_action, NULL);
546
if(ret == -1){
547
error_plus(0, errno, "sigaction");
548
}
549
raise(signal_received);
550
}
551
552
if(debug){
258
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
259
perror("tcsetattr+echo");
260
}
261
262
if (debug){
553
263
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
554
264
status);
555
265
}
556
if(status == EXIT_SUCCESS or status == EX_OK){
266
if(status == EXIT_SUCCESS){
557
267
fputc('\n', stderr);
558
268
}
559
269
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0