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
- plugin-helpers
- 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 © 2008-2017 Teddy Hogeborn
6
* Copyright © 2008-2017 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
16
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
* General Public License for more details.
19
*
20
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
22
*
23
* Contact the authors at <mandos@recompile.se>.
24
*/
25
26
#define _GNU_SOURCE /* getline(), asprintf() */
27
28
#include <termios.h> /* struct termios, tcsetattr(),
1
#define _GNU_SOURCE /* getline() */
2
#define _FORTIFY_SOURCE 2
3
#include <termios.h> /* struct termios, tcsetattr(),
29
4
TCSAFLUSH, tcgetattr(), ECHO */
30
5
#include <unistd.h> /* struct termios, tcsetattr(),
31
6
STDIN_FILENO, TCSAFLUSH,
32
tcgetattr(), ECHO, readlink() */
7
tcgetattr(), ECHO */
33
8
#include <signal.h> /* sig_atomic_t, raise(), struct
34
9
sigaction, sigemptyset(),
35
10
sigaction(), sigaddset(), SIGINT,
36
SIGQUIT, SIGHUP, SIGTERM,
37
raise() */
38
#include <stddef.h> /* NULL, size_t, ssize_t */
39
#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
40
ssize_t, open() */
41
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
42
getenv(), free() */
43
#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 */
44
15
#include <stdio.h> /* fprintf(), stderr, getline(),
45
stdin, feof(), fputc(), vfprintf(),
46
vasprintf() */
47
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
48
EFAULT, EFBIG, EIO, ENOSPC, EINTR
49
*/
50
#include <error.h> /* error() */
16
stdin, feof(), perror(), fputc(),
17
stdout */
18
#include <errno.h> /* errno, EINVAL */
51
19
#include <iso646.h> /* or, not */
52
20
#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
*/
57
#include <argp.h> /* struct argp_option, struct
58
argp_state, struct argp,
59
argp_parse(), error_t,
60
ARGP_KEY_ARG, ARGP_KEY_END,
61
ARGP_ERR_UNKNOWN */
62
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
63
EX_UNAVAILABLE, EX_IOERR, EX_OK */
64
#include <fcntl.h> /* open() */
65
#include <stdarg.h> /* va_list, va_start(), ... */
66
67
volatile sig_atomic_t quit_now = 0;
68
int signal_received;
69
bool debug = false;
70
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
}
98
99
static void termination_handler(int signum){
100
if(quit_now){
101
return;
102
}
103
quit_now = 1;
104
signal_received = signum;
105
}
106
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
21
22
volatile bool quit_now = false;
23
24
void termination_handler(int signum){
25
quit_now = true;
26
}
229
27
230
28
int main(int argc, char **argv){
231
ssize_t sret;
232
int ret;
29
ssize_t ret = -1;
233
30
size_t n;
234
31
struct termios t_new, t_old;
235
32
char *buffer = NULL;
236
char *prefix = NULL;
237
33
int status = EXIT_SUCCESS;
238
34
struct sigaction old_action,
239
35
new_action = { .sa_handler = termination_handler,
240
36
.sa_flags = 0 };
241
{
242
struct argp_option options[] = {
243
{ .name = "prefix", .key = 'p',
244
.arg = "PREFIX", .flags = 0,
245
.doc = "Prefix shown before the prompt", .group = 2 },
246
{ .name = "debug", .key = 128,
247
.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
{ .name = NULL }
258
};
259
260
__attribute__((nonnull(3)))
261
error_t parse_opt (int key, char *arg, struct argp_state *state){
262
errno = 0;
263
switch (key){
264
case 'p':
265
prefix = arg;
266
break;
267
case 128:
268
debug = true;
269
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
case -3: /* --usage */
278
argp_state_help(state, state->out_stream,
279
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
280
case 'V': /* --version */
281
fprintf(state->out_stream, "%s\n", argp_program_version);
282
exit(argp_err_exit_status);
283
break;
284
default:
285
return ARGP_ERR_UNKNOWN;
286
}
287
return errno;
288
}
289
290
struct argp argp = { .options = options, .parser = parse_opt,
291
.args_doc = "",
292
.doc = "Mandos password-prompt -- Read and"
293
" output a password" };
294
ret = argp_parse(&argp, argc, argv,
295
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
296
switch(ret){
297
case 0:
298
break;
299
case ENOMEM:
300
default:
301
errno = ret;
302
error_plus(0, errno, "argp_parse");
303
return EX_OSERR;
304
case EINVAL:
305
return EX_USAGE;
306
}
307
}
308
37
309
if(debug){
310
fprintf(stderr, "Starting %s\n", argv[0]);
311
}
312
313
if(conflict_detection()){
314
if(debug){
315
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
316
}
38
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
317
39
return EXIT_FAILURE;
318
40
}
319
41
320
if(debug){
321
fprintf(stderr, "Storing current terminal attributes\n");
322
}
323
324
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
325
int e = errno;
326
error_plus(0, errno, "tcgetattr");
327
switch(e){
328
case EBADF:
329
case ENOTTY:
330
return EX_UNAVAILABLE;
331
default:
332
return EX_OSERR;
333
}
334
}
335
336
42
sigemptyset(&new_action.sa_mask);
337
ret = sigaddset(&new_action.sa_mask, SIGINT);
338
if(ret == -1){
339
error_plus(0, errno, "sigaddset");
340
return EX_OSERR;
341
}
342
ret = sigaddset(&new_action.sa_mask, SIGHUP);
343
if(ret == -1){
344
error_plus(0, errno, "sigaddset");
345
return EX_OSERR;
346
}
347
ret = sigaddset(&new_action.sa_mask, SIGTERM);
348
if(ret == -1){
349
error_plus(0, errno, "sigaddset");
350
return EX_OSERR;
351
}
352
/* Need to check if the handler is SIG_IGN before handling:
353
| [[info:libc:Initial Signal Actions]] |
354
| [[info:libc:Basic Signal Handling]] |
355
*/
356
ret = sigaction(SIGINT, NULL, &old_action);
357
if(ret == -1){
358
error_plus(0, errno, "sigaction");
359
return EX_OSERR;
360
}
361
if(old_action.sa_handler != SIG_IGN){
362
ret = sigaction(SIGINT, &new_action, NULL);
363
if(ret == -1){
364
error_plus(0, errno, "sigaction");
365
return EX_OSERR;
366
}
367
}
368
ret = sigaction(SIGHUP, NULL, &old_action);
369
if(ret == -1){
370
error_plus(0, errno, "sigaction");
371
return EX_OSERR;
372
}
373
if(old_action.sa_handler != SIG_IGN){
374
ret = sigaction(SIGHUP, &new_action, NULL);
375
if(ret == -1){
376
error_plus(0, errno, "sigaction");
377
return EX_OSERR;
378
}
379
}
380
ret = sigaction(SIGTERM, NULL, &old_action);
381
if(ret == -1){
382
error_plus(0, errno, "sigaction");
383
return EX_OSERR;
384
}
385
if(old_action.sa_handler != SIG_IGN){
386
ret = sigaction(SIGTERM, &new_action, NULL);
387
if(ret == -1){
388
error_plus(0, errno, "sigaction");
389
return EX_OSERR;
390
}
391
}
392
393
394
if(debug){
395
fprintf(stderr, "Removing echo flag from terminal attributes\n");
396
}
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);
397
59
398
60
t_new = t_old;
399
t_new.c_lflag &= ~(tcflag_t)ECHO;
400
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
401
int e = errno;
402
error_plus(0, errno, "tcsetattr-echo");
403
switch(e){
404
case EBADF:
405
case ENOTTY:
406
return EX_UNAVAILABLE;
407
case EINVAL:
408
default:
409
return EX_OSERR;
410
}
61
t_new.c_lflag &= ~ECHO;
62
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
63
perror("tcsetattr-echo");
64
return EXIT_FAILURE;
411
65
}
412
66
413
if(debug){
414
fprintf(stderr, "Waiting for input from stdin \n");
415
}
416
67
while(true){
417
if(quit_now){
418
if(debug){
419
fprintf(stderr, "Interrupted by signal, exiting.\n");
420
}
68
if (quit_now){
421
69
status = EXIT_FAILURE;
422
70
break;
423
71
}
424
425
if(prefix){
426
fprintf(stderr, "%s ", prefix);
427
}
428
{
429
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
430
const char *crypttarget = getenv("CRYPTTAB_NAME");
431
/* Before cryptsetup 1.1.0~rc2 */
432
if(cryptsource == NULL){
433
cryptsource = getenv("cryptsource");
434
}
435
if(crypttarget == NULL){
436
crypttarget = getenv("crypttarget");
437
}
438
const char *const prompt1 = "Unlocking the disk";
439
const char *const prompt2 = "Enter passphrase";
440
if(cryptsource == NULL){
441
if(crypttarget == NULL){
442
fprintf(stderr, "%s to unlock the disk: ", prompt2);
443
} else {
444
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
445
prompt2);
446
}
447
} else {
448
if(crypttarget == NULL){
449
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
450
prompt2);
451
} else {
452
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
453
crypttarget, prompt2);
454
}
455
}
456
}
457
sret = getline(&buffer, &n, stdin);
458
if(sret > 0){
72
fprintf(stderr, "Password: ");
73
ret = getline(&buffer, &n, stdin);
74
if (ret > 0){
75
fprintf(stdout, "%s", buffer);
459
76
status = EXIT_SUCCESS;
460
/* Make n = data size instead of allocated buffer size */
461
n = (size_t)sret;
462
/* Strip final newline */
463
if(n > 0 and buffer[n-1] == '\n'){
464
buffer[n-1] = '\0'; /* not strictly necessary */
465
n--;
466
}
467
size_t written = 0;
468
while(written < n){
469
sret = write(STDOUT_FILENO, buffer + written, n - written);
470
if(sret < 0){
471
int e = errno;
472
error_plus(0, errno, "write");
473
switch(e){
474
case EBADF:
475
case EFAULT:
476
case EINVAL:
477
case EFBIG:
478
case EIO:
479
case ENOSPC:
480
default:
481
status = EX_IOERR;
482
break;
483
case EINTR:
484
status = EXIT_FAILURE;
485
break;
486
}
487
break;
488
}
489
written += (size_t)sret;
490
}
491
sret = close(STDOUT_FILENO);
492
if(sret == -1){
493
int e = errno;
494
error_plus(0, errno, "close");
495
switch(e){
496
case EBADF:
497
status = EX_OSFILE;
498
break;
499
case EIO:
500
default:
501
status = EX_IOERR;
502
break;
503
}
504
}
505
77
break;
506
78
}
507
if(sret < 0){
508
int e = errno;
509
if(errno != EINTR and not feof(stdin)){
510
error_plus(0, errno, "getline");
511
switch(e){
512
case EBADF:
513
status = EX_UNAVAILABLE;
514
break;
515
case EIO:
516
case EINVAL:
517
default:
518
status = EX_IOERR;
519
break;
520
}
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;
521
84
break;
522
85
}
523
86
}
524
/* if(sret == 0), then the only sensible thing to do is to retry
525
to read from stdin */
526
fputc('\n', stderr);
527
if(debug and not quit_now){
528
/* If quit_now is nonzero, we were interrupted by a signal, and
529
will print that later, so no need to show this too. */
530
fprintf(stderr, "getline() returned 0, retrying.\n");
531
}
532
}
533
534
free(buffer);
535
536
if(debug){
537
fprintf(stderr, "Restoring terminal attributes\n");
538
}
539
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
540
error_plus(0, errno, "tcsetattr+echo");
541
}
542
543
if(quit_now){
544
sigemptyset(&old_action.sa_mask);
545
old_action.sa_handler = SIG_DFL;
546
ret = sigaction(signal_received, &old_action, NULL);
547
if(ret == -1){
548
error_plus(0, errno, "sigaction");
549
}
550
raise(signal_received);
551
}
552
553
if(debug){
554
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
555
status);
556
}
557
if(status == EXIT_SUCCESS or status == EX_OK){
558
fputc('\n', stderr);
87
fputc('\n', stderr);
88
}
89
90
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
91
perror("tcsetattr+echo");
559
92
}
560
93
561
94
return status;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0