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- 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
- 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 © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 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@fukt.bsnet.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()
45
*/
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 */
55
#include <argp.h> /* struct argp_option, struct
56
argp_state, struct argp,
57
argp_parse(), error_t,
58
ARGP_KEY_ARG, ARGP_KEY_END,
59
ARGP_ERR_UNKNOWN */
60
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
61
EX_UNAVAILABLE, EX_IOERR, EX_OK */
62
#include <fcntl.h> /* open() */
63
64
volatile sig_atomic_t quit_now = 0;
65
int signal_received;
66
bool debug = false;
67
const char *argp_program_version = "password-prompt " VERSION;
68
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
69
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
}
77
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
21
22
volatile bool quit_now = false;
23
24
void termination_handler(int signum){
25
quit_now = true;
26
}
193
27
194
28
int main(int argc, char **argv){
195
ssize_t sret;
196
int ret;
29
ssize_t ret = -1;
197
30
size_t n;
198
31
struct termios t_new, t_old;
199
32
char *buffer = NULL;
200
char *prefix = NULL;
201
33
int status = EXIT_SUCCESS;
202
34
struct sigaction old_action,
203
35
new_action = { .sa_handler = termination_handler,
204
36
.sa_flags = 0 };
205
{
206
struct argp_option options[] = {
207
{ .name = "prefix", .key = 'p',
208
.arg = "PREFIX", .flags = 0,
209
.doc = "Prefix shown before the prompt", .group = 2 },
210
{ .name = "debug", .key = 128,
211
.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
{ .name = NULL }
222
};
223
224
error_t parse_opt (int key, char *arg, struct argp_state *state){
225
errno = 0;
226
switch (key){
227
case 'p':
228
prefix = arg;
229
break;
230
case 128:
231
debug = true;
232
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);
246
break;
247
default:
248
return ARGP_ERR_UNKNOWN;
249
}
250
return errno;
251
}
252
253
struct argp argp = { .options = options, .parser = parse_opt,
254
.args_doc = "",
255
.doc = "Mandos password-prompt -- Read and"
256
" 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;
269
}
270
}
271
37
272
if(debug){
273
fprintf(stderr, "Starting %s\n", argv[0]);
274
}
275
276
if (conflict_detection()){
277
if(debug){
278
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
279
}
38
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
280
39
return EXIT_FAILURE;
281
40
}
282
41
283
if(debug){
284
fprintf(stderr, "Storing current terminal attributes\n");
285
}
286
287
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
}
297
}
298
299
42
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
*/
319
ret = sigaction(SIGINT, NULL, &old_action);
320
if(ret == -1){
321
error(0, errno, "sigaction");
322
return EX_OSERR;
323
}
324
if(old_action.sa_handler != SIG_IGN){
325
ret = sigaction(SIGINT, &new_action, NULL);
326
if(ret == -1){
327
error(0, errno, "sigaction");
328
return EX_OSERR;
329
}
330
}
331
ret = sigaction(SIGHUP, NULL, &old_action);
332
if(ret == -1){
333
error(0, errno, "sigaction");
334
return EX_OSERR;
335
}
336
if(old_action.sa_handler != SIG_IGN){
337
ret = sigaction(SIGHUP, &new_action, NULL);
338
if(ret == -1){
339
error(0, errno, "sigaction");
340
return EX_OSERR;
341
}
342
}
343
ret = sigaction(SIGTERM, NULL, &old_action);
344
if(ret == -1){
345
error(0, errno, "sigaction");
346
return EX_OSERR;
347
}
348
if(old_action.sa_handler != SIG_IGN){
349
ret = sigaction(SIGTERM, &new_action, NULL);
350
if(ret == -1){
351
error(0, errno, "sigaction");
352
return EX_OSERR;
353
}
354
}
355
356
357
if(debug){
358
fprintf(stderr, "Removing echo flag from terminal attributes\n");
359
}
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);
360
59
361
60
t_new = t_old;
362
t_new.c_lflag &= ~(tcflag_t)ECHO;
363
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
}
61
t_new.c_lflag &= ~ECHO;
62
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
63
perror("tcsetattr-echo");
64
return EXIT_FAILURE;
374
65
}
375
66
376
if(debug){
377
fprintf(stderr, "Waiting for input from stdin \n");
378
}
379
67
while(true){
380
if(quit_now){
381
if(debug){
382
fprintf(stderr, "Interrupted by signal, exiting.\n");
383
}
68
if (quit_now){
384
69
status = EXIT_FAILURE;
385
70
break;
386
71
}
387
388
if(prefix){
389
fprintf(stderr, "%s ", prefix);
390
}
391
{
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";
403
if(cryptsource == NULL){
404
if(crypttarget == NULL){
405
fprintf(stderr, "%s to unlock the disk: ", prompt2);
406
} else {
407
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
408
prompt2);
409
}
410
} else {
411
if(crypttarget == NULL){
412
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
413
prompt2);
414
} else {
415
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
416
crypttarget, prompt2);
417
}
418
}
419
}
420
sret = getline(&buffer, &n, stdin);
421
if(sret > 0){
72
fprintf(stderr, "Password: ");
73
ret = getline(&buffer, &n, stdin);
74
if (ret > 0){
75
fprintf(stdout, "%s", buffer);
422
76
status = EXIT_SUCCESS;
423
/* Make n = data size instead of allocated buffer size */
424
n = (size_t)sret;
425
/* Strip final newline */
426
if(n > 0 and buffer[n-1] == '\n'){
427
buffer[n-1] = '\0'; /* not strictly necessary */
428
n--;
429
}
430
size_t written = 0;
431
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
}
467
}
468
77
break;
469
78
}
470
if(sret < 0){
471
int e = errno;
472
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
}
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;
483
84
break;
484
85
}
485
86
}
486
/* if(sret == 0), then the only sensible thing to do is to retry
487
to read from stdin */
488
fputc('\n', stderr);
489
if(debug and not quit_now){
490
/* If quit_now is nonzero, we were interrupted by a signal, and
491
will print that later, so no need to show this too. */
492
fprintf(stderr, "getline() returned 0, retrying.\n");
493
}
494
}
495
496
free(buffer);
497
498
if(debug){
499
fprintf(stderr, "Restoring terminal attributes\n");
500
}
501
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);
513
}
514
515
if(debug){
516
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
517
status);
518
}
519
if(status == EXIT_SUCCESS or status == EX_OK){
520
fputc('\n', stderr);
87
fputc('\n', stderr);
88
}
89
90
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
91
perror("tcsetattr+echo");
521
92
}
522
93
523
94
return status;
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