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/passprompt.c
- browse files at revision 13
- compare with another revision
- download diff
- download tarball
- view history from revision 13
- Committer: Björn Påhlsson
- Date: 2008-07-20 02:52:20 UTC
- Revision ID: belorn@braxen-20080720025220-r5u0388uy9iu23h6
Added following support:
Pluginbased client handler
rewritten Mandos client
Avahi instead of udp server discovery
openpgp encrypted key support
Passprompt stand alone application for direct console input
Added logging for Mandos server
Pluginbased client handler
rewritten Mandos client
Avahi instead of udp server discovery
openpgp encrypted key support
Passprompt stand alone application for direct console input
Added logging for Mandos server
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- debian/upstream
- network-hooks.d
- files renamed:
- clients.conf => mandos-clients.conf
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/passprompt.c
1
/* -*- coding: utf-8; mode: c; mode: orgtbl -*- */
2
/*
3
* Password-prompt - Read a password from the terminal and print it
4
*
5
* Copyright © 2008-2014 Teddy Hogeborn
6
* Copyright © 2008-2014 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
14
* WITHOUT ANY WARRANTY; without even the implied warranty of
15
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16
* General Public License for more details.
17
*
18
* You should have received a copy of the GNU General Public License
19
* along with this program. If not, see
20
* <http://www.gnu.org/licenses/>.
21
*
22
* Contact the authors at <mandos@recompile.se>.
23
*/
24
25
#define _GNU_SOURCE /* getline(), asprintf() */
26
27
#include <termios.h> /* struct termios, tcsetattr(),
1
#define _GNU_SOURCE /* getline() */
2
#define _FORTIFY_SOURCE 2
3
#include <termios.h> /* struct termios, tcsetattr(),
28
4
TCSAFLUSH, tcgetattr(), ECHO */
29
5
#include <unistd.h> /* struct termios, tcsetattr(),
30
6
STDIN_FILENO, TCSAFLUSH,
31
tcgetattr(), ECHO, readlink() */
7
tcgetattr(), ECHO */
32
8
#include <signal.h> /* sig_atomic_t, raise(), struct
33
9
sigaction, sigemptyset(),
34
10
sigaction(), sigaddset(), SIGINT,
35
SIGQUIT, SIGHUP, SIGTERM,
36
raise() */
37
#include <stddef.h> /* NULL, size_t, ssize_t */
38
#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
39
ssize_t, open() */
40
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
41
getenv(), free() */
42
#include <dirent.h> /* scandir(), alphasort() */
11
SIGQUIT, SIGHUP, SIGTERM */
12
#include <stddef.h> /* NULL, size_t */
13
#include <sys/types.h> /* ssize_t */
14
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE */
43
15
#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() */
16
stdin, feof(), perror(), fputc(),
17
stdout */
18
#include <errno.h> /* errno, EINVAL */
50
19
#include <iso646.h> /* or, not */
51
20
#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
*/
56
#include <argp.h> /* struct argp_option, struct
57
argp_state, struct argp,
58
argp_parse(), error_t,
59
ARGP_KEY_ARG, ARGP_KEY_END,
60
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
66
volatile sig_atomic_t quit_now = 0;
67
int signal_received;
68
bool debug = false;
69
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
free(direntries);
219
return ret > 0;
220
}
221
21
22
volatile bool quit_now = false;
23
24
void termination_handler(int signum){
25
quit_now = true;
26
}
222
27
223
28
int main(int argc, char **argv){
224
ssize_t sret;
225
int ret;
29
ssize_t ret = -1;
226
30
size_t n;
227
31
struct termios t_new, t_old;
228
32
char *buffer = NULL;
229
char *prefix = NULL;
230
33
int status = EXIT_SUCCESS;
231
34
struct sigaction old_action,
232
35
new_action = { .sa_handler = termination_handler,
233
36
.sa_flags = 0 };
234
{
235
struct argp_option options[] = {
236
{ .name = "prefix", .key = 'p',
237
.arg = "PREFIX", .flags = 0,
238
.doc = "Prefix shown before the prompt", .group = 2 },
239
{ .name = "debug", .key = 128,
240
.doc = "Debug mode", .group = 3 },
241
/*
242
* These reproduce what we would get without ARGP_NO_HELP
243
*/
244
{ .name = "help", .key = '?',
245
.doc = "Give this help list", .group = -1 },
246
{ .name = "usage", .key = -3,
247
.doc = "Give a short usage message", .group = -1 },
248
{ .name = "version", .key = 'V',
249
.doc = "Print program version", .group = -1 },
250
{ .name = NULL }
251
};
252
253
__attribute__((nonnull(3)))
254
error_t parse_opt (int key, char *arg, struct argp_state *state){
255
errno = 0;
256
switch (key){
257
case 'p':
258
prefix = arg;
259
break;
260
case 128:
261
debug = true;
262
break;
263
/*
264
* These reproduce what we would get without ARGP_NO_HELP
265
*/
266
case '?': /* --help */
267
argp_state_help(state, state->out_stream,
268
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
269
& ~(unsigned int)ARGP_HELP_EXIT_OK);
270
case -3: /* --usage */
271
argp_state_help(state, state->out_stream,
272
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
273
case 'V': /* --version */
274
fprintf(state->out_stream, "%s\n", argp_program_version);
275
exit(argp_err_exit_status);
276
break;
277
default:
278
return ARGP_ERR_UNKNOWN;
279
}
280
return errno;
281
}
282
283
struct argp argp = { .options = options, .parser = parse_opt,
284
.args_doc = "",
285
.doc = "Mandos password-prompt -- Read and"
286
" output a password" };
287
ret = argp_parse(&argp, argc, argv,
288
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
289
switch(ret){
290
case 0:
291
break;
292
case ENOMEM:
293
default:
294
errno = ret;
295
error_plus(0, errno, "argp_parse");
296
return EX_OSERR;
297
case EINVAL:
298
return EX_USAGE;
299
}
300
}
301
37
302
if(debug){
303
fprintf(stderr, "Starting %s\n", argv[0]);
304
}
305
306
if(conflict_detection()){
307
if(debug){
308
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
309
}
38
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
310
39
return EXIT_FAILURE;
311
40
}
312
41
313
if(debug){
314
fprintf(stderr, "Storing current terminal attributes\n");
315
}
316
317
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
318
int e = errno;
319
error_plus(0, errno, "tcgetattr");
320
switch(e){
321
case EBADF:
322
case ENOTTY:
323
return EX_UNAVAILABLE;
324
default:
325
return EX_OSERR;
326
}
327
}
328
329
42
sigemptyset(&new_action.sa_mask);
330
ret = sigaddset(&new_action.sa_mask, SIGINT);
331
if(ret == -1){
332
error_plus(0, errno, "sigaddset");
333
return EX_OSERR;
334
}
335
ret = sigaddset(&new_action.sa_mask, SIGHUP);
336
if(ret == -1){
337
error_plus(0, errno, "sigaddset");
338
return EX_OSERR;
339
}
340
ret = sigaddset(&new_action.sa_mask, SIGTERM);
341
if(ret == -1){
342
error_plus(0, errno, "sigaddset");
343
return EX_OSERR;
344
}
345
/* Need to check if the handler is SIG_IGN before handling:
346
| [[info:libc:Initial Signal Actions]] |
347
| [[info:libc:Basic Signal Handling]] |
348
*/
349
ret = sigaction(SIGINT, NULL, &old_action);
350
if(ret == -1){
351
error_plus(0, errno, "sigaction");
352
return EX_OSERR;
353
}
354
if(old_action.sa_handler != SIG_IGN){
355
ret = sigaction(SIGINT, &new_action, NULL);
356
if(ret == -1){
357
error_plus(0, errno, "sigaction");
358
return EX_OSERR;
359
}
360
}
361
ret = sigaction(SIGHUP, NULL, &old_action);
362
if(ret == -1){
363
error_plus(0, errno, "sigaction");
364
return EX_OSERR;
365
}
366
if(old_action.sa_handler != SIG_IGN){
367
ret = sigaction(SIGHUP, &new_action, NULL);
368
if(ret == -1){
369
error_plus(0, errno, "sigaction");
370
return EX_OSERR;
371
}
372
}
373
ret = sigaction(SIGTERM, NULL, &old_action);
374
if(ret == -1){
375
error_plus(0, errno, "sigaction");
376
return EX_OSERR;
377
}
378
if(old_action.sa_handler != SIG_IGN){
379
ret = sigaction(SIGTERM, &new_action, NULL);
380
if(ret == -1){
381
error_plus(0, errno, "sigaction");
382
return EX_OSERR;
383
}
384
}
385
386
387
if(debug){
388
fprintf(stderr, "Removing echo flag from terminal attributes\n");
389
}
43
sigaddset(&new_action.sa_mask, SIGINT);
44
sigaddset(&new_action.sa_mask, SIGQUIT);
45
sigaddset(&new_action.sa_mask, SIGHUP);
46
sigaddset(&new_action.sa_mask, SIGTERM);
47
sigaction(SIGINT, NULL, &old_action);
48
if (old_action.sa_handler != SIG_IGN)
49
sigaction(SIGINT, &new_action, NULL);
50
sigaction(SIGQUIT, NULL, &old_action);
51
if (old_action.sa_handler != SIG_IGN)
52
sigaction(SIGQUIT, &new_action, NULL);
53
sigaction(SIGHUP, NULL, &old_action);
54
if (old_action.sa_handler != SIG_IGN)
55
sigaction(SIGHUP, &new_action, NULL);
56
sigaction(SIGTERM, NULL, &old_action);
57
if (old_action.sa_handler != SIG_IGN)
58
sigaction(SIGTERM, &new_action, NULL);
390
59
391
60
t_new = t_old;
392
t_new.c_lflag &= ~(tcflag_t)ECHO;
393
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
394
int e = errno;
395
error_plus(0, errno, "tcsetattr-echo");
396
switch(e){
397
case EBADF:
398
case ENOTTY:
399
return EX_UNAVAILABLE;
400
case EINVAL:
401
default:
402
return EX_OSERR;
403
}
61
t_new.c_lflag &= ~ECHO;
62
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
63
perror("tcsetattr-echo");
64
return EXIT_FAILURE;
404
65
}
405
66
406
if(debug){
407
fprintf(stderr, "Waiting for input from stdin \n");
408
}
409
67
while(true){
410
if(quit_now){
411
if(debug){
412
fprintf(stderr, "Interrupted by signal, exiting.\n");
413
}
68
if (quit_now){
414
69
status = EXIT_FAILURE;
415
70
break;
416
71
}
417
418
if(prefix){
419
fprintf(stderr, "%s ", prefix);
420
}
421
{
422
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
423
const char *crypttarget = getenv("CRYPTTAB_NAME");
424
/* Before cryptsetup 1.1.0~rc2 */
425
if(cryptsource == NULL){
426
cryptsource = getenv("cryptsource");
427
}
428
if(crypttarget == NULL){
429
crypttarget = getenv("crypttarget");
430
}
431
const char *const prompt1 = "Unlocking the disk";
432
const char *const prompt2 = "Enter passphrase";
433
if(cryptsource == NULL){
434
if(crypttarget == NULL){
435
fprintf(stderr, "%s to unlock the disk: ", prompt2);
436
} else {
437
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
438
prompt2);
439
}
440
} else {
441
if(crypttarget == NULL){
442
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
443
prompt2);
444
} else {
445
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
446
crypttarget, prompt2);
447
}
448
}
449
}
450
sret = getline(&buffer, &n, stdin);
451
if(sret > 0){
72
fprintf(stderr, "Password: ");
73
ret = getline(&buffer, &n, stdin);
74
if (ret > 0){
75
fprintf(stdout, "%s", buffer);
452
76
status = EXIT_SUCCESS;
453
/* Make n = data size instead of allocated buffer size */
454
n = (size_t)sret;
455
/* Strip final newline */
456
if(n > 0 and buffer[n-1] == '\n'){
457
buffer[n-1] = '\0'; /* not strictly necessary */
458
n--;
459
}
460
size_t written = 0;
461
while(written < n){
462
sret = write(STDOUT_FILENO, buffer + written, n - written);
463
if(sret < 0){
464
int e = errno;
465
error_plus(0, errno, "write");
466
switch(e){
467
case EBADF:
468
case EFAULT:
469
case EINVAL:
470
case EFBIG:
471
case EIO:
472
case ENOSPC:
473
default:
474
status = EX_IOERR;
475
break;
476
case EINTR:
477
status = EXIT_FAILURE;
478
break;
479
}
480
break;
481
}
482
written += (size_t)sret;
483
}
484
sret = close(STDOUT_FILENO);
485
if(sret == -1){
486
int e = errno;
487
error_plus(0, errno, "close");
488
switch(e){
489
case EBADF:
490
status = EX_OSFILE;
491
break;
492
case EIO:
493
default:
494
status = EX_IOERR;
495
break;
496
}
497
}
498
77
break;
499
78
}
500
if(sret < 0){
501
int e = errno;
502
if(errno != EINTR and not feof(stdin)){
503
error_plus(0, errno, "getline");
504
switch(e){
505
case EBADF:
506
status = EX_UNAVAILABLE;
507
break;
508
case EIO:
509
case EINVAL:
510
default:
511
status = EX_IOERR;
512
break;
513
}
79
// ret == 0 makes no other sence than to retry to read from stdin
80
if (ret < 0){
81
if (errno != EINTR and not feof(stdin)){
82
perror("getline");
83
status = EXIT_FAILURE;
514
84
break;
515
85
}
516
86
}
517
/* if(sret == 0), then the only sensible thing to do is to retry
518
to read from stdin */
519
fputc('\n', stderr);
520
if(debug and not quit_now){
521
/* If quit_now is nonzero, we were interrupted by a signal, and
522
will print that later, so no need to show this too. */
523
fprintf(stderr, "getline() returned 0, retrying.\n");
524
}
525
}
526
527
free(buffer);
528
529
if(debug){
530
fprintf(stderr, "Restoring terminal attributes\n");
531
}
532
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
533
error_plus(0, errno, "tcsetattr+echo");
534
}
535
536
if(quit_now){
537
sigemptyset(&old_action.sa_mask);
538
old_action.sa_handler = SIG_DFL;
539
ret = sigaction(signal_received, &old_action, NULL);
540
if(ret == -1){
541
error_plus(0, errno, "sigaction");
542
}
543
raise(signal_received);
544
}
545
546
if(debug){
547
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
548
status);
549
}
550
if(status == EXIT_SUCCESS or status == EX_OK){
551
fputc('\n', stderr);
87
fputc('\n', stderr);
88
}
89
90
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
91
perror("tcsetattr+echo");
552
92
}
553
93
554
94
return status;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0