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- Committer: Teddy Hogeborn
- Date: 2008-01-19 04:09:06 UTC
- Revision ID: teddy@fukt.bsnet.se-20080119040906-yjriaiqxbvzb93mq
* Makefile (client_debug): Bug fix; add quotes and / to CERT_ROOT.
* server.py (cred): Removed; no need for a global variable.
* server.py (cred): Removed; no need for a global variable.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- plugins.d
- files renamed:
- clients.conf => mandos-clients.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/password-prompt.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(),
28
TCSAFLUSH, tcgetattr(), ECHO */
29
#include <unistd.h> /* struct termios, tcsetattr(),
30
STDIN_FILENO, TCSAFLUSH,
31
tcgetattr(), ECHO, readlink() */
32
#include <signal.h> /* sig_atomic_t, raise(), struct
33
sigaction, sigemptyset(),
34
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, ssize_t */
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
40
getenv(), free() */
41
#include <dirent.h> /* scandir(), alphasort() */
42
#include <stdio.h> /* fprintf(), stderr, getline(),
43
stdin, feof(), fputc()
44
*/
45
#include <errno.h> /* errno, EBADF, ENOTTY, EINVAL,
46
EFAULT, EFBIG, EIO, ENOSPC, EINTR
47
*/
48
#include <error.h> /* error() */
49
#include <iso646.h> /* or, not */
50
#include <stdbool.h> /* bool, false, true */
51
#include <inttypes.h> /* strtoumax() */
52
#include <sys/stat.h> /* struct stat, lstat() */
53
#include <string.h> /* strlen, rindex, memcmp */
54
#include <argp.h> /* struct argp_option, struct
55
argp_state, struct argp,
56
argp_parse(), error_t,
57
ARGP_KEY_ARG, ARGP_KEY_END,
58
ARGP_ERR_UNKNOWN */
59
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
60
EX_UNAVAILABLE, EX_IOERR, EX_OK */
61
62
volatile sig_atomic_t quit_now = 0;
63
int signal_received;
64
bool debug = false;
65
const char *argp_program_version = "password-prompt " VERSION;
66
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
67
68
/* Needed for conflic resolution */
69
const char plymouthd_path[] = "/sbin/plymouth";
70
71
72
static void termination_handler(int signum){
73
if(quit_now){
74
return;
75
}
76
quit_now = 1;
77
signal_received = signum;
78
}
79
80
bool conflict_detection(void){
81
82
/* plymouth conflicts with password-promt since both want to control the
83
associated terminal. Password-prompt exit since plymouth perferms the same
84
functionallity.
85
*/
86
int is_plymouth(const struct dirent *proc_entry){
87
int ret;
88
{
89
uintmax_t maxvalue;
90
char *tmp;
91
errno = 0;
92
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
93
94
if(errno != 0 or *tmp != '\0'
95
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
96
return 0;
97
}
98
}
99
char exe_target[sizeof(plymouthd_path)];
100
char *exe_link;
101
ret = asprintf(&exe_link, "/proc/%s/exe", proc_entry->d_name);
102
if(ret == -1){
103
error(0, errno, "asprintf");
104
return 0;
105
}
106
107
struct stat exe_stat;
108
ret = lstat(exe_link, &exe_stat);
109
if(ret == -1){
110
free(exe_link);
111
if(errno != ENOENT){
112
error(0, errno, "lstat");
113
}
114
return 0;
115
}
116
117
if(not S_ISLNK(exe_stat.st_mode)
118
or exe_stat.st_uid != 0
119
or exe_stat.st_gid != 0){
120
free(exe_link);
121
return 0;
122
}
123
124
ssize_t sret = readlink(exe_link, exe_target, sizeof(exe_target));
125
free(exe_link);
126
if((sret != (ssize_t)sizeof(plymouthd_path)-1) or
127
(memcmp(plymouthd_path, exe_target,
128
sizeof(plymouthd_path)-1) != 0)){
129
return 0;
130
}
131
return 1;
132
}
133
134
struct dirent **direntries;
135
int ret;
136
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
137
if (ret == -1){
138
error(1, errno, "scandir");
139
}
140
if (ret < 0){
141
return 1;
142
} else {
143
return 0;
144
}
145
}
146
147
148
int main(int argc, char **argv){
149
ssize_t sret;
150
int ret;
151
size_t n;
152
struct termios t_new, t_old;
153
char *buffer = NULL;
154
char *prefix = NULL;
155
int status = EXIT_SUCCESS;
156
struct sigaction old_action,
157
new_action = { .sa_handler = termination_handler,
158
.sa_flags = 0 };
159
{
160
struct argp_option options[] = {
161
{ .name = "prefix", .key = 'p',
162
.arg = "PREFIX", .flags = 0,
163
.doc = "Prefix shown before the prompt", .group = 2 },
164
{ .name = "debug", .key = 128,
165
.doc = "Debug mode", .group = 3 },
166
/*
167
* These reproduce what we would get without ARGP_NO_HELP
168
*/
169
{ .name = "help", .key = '?',
170
.doc = "Give this help list", .group = -1 },
171
{ .name = "usage", .key = -3,
172
.doc = "Give a short usage message", .group = -1 },
173
{ .name = "version", .key = 'V',
174
.doc = "Print program version", .group = -1 },
175
{ .name = NULL }
176
};
177
178
error_t parse_opt (int key, char *arg, struct argp_state *state){
179
errno = 0;
180
switch (key){
181
case 'p':
182
prefix = arg;
183
break;
184
case 128:
185
debug = true;
186
break;
187
/*
188
* These reproduce what we would get without ARGP_NO_HELP
189
*/
190
case '?': /* --help */
191
argp_state_help(state, state->out_stream,
192
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
193
& ~(unsigned int)ARGP_HELP_EXIT_OK);
194
case -3: /* --usage */
195
argp_state_help(state, state->out_stream,
196
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
197
case 'V': /* --version */
198
fprintf(state->out_stream, "%s\n", argp_program_version);
199
exit(argp_err_exit_status);
200
break;
201
default:
202
return ARGP_ERR_UNKNOWN;
203
}
204
return errno;
205
}
206
207
struct argp argp = { .options = options, .parser = parse_opt,
208
.args_doc = "",
209
.doc = "Mandos password-prompt -- Read and"
210
" output a password" };
211
ret = argp_parse(&argp, argc, argv,
212
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
213
switch(ret){
214
case 0:
215
break;
216
case ENOMEM:
217
default:
218
errno = ret;
219
error(0, errno, "argp_parse");
220
return EX_OSERR;
221
case EINVAL:
222
return EX_USAGE;
223
}
224
}
225
226
if(debug){
227
fprintf(stderr, "Starting %s\n", argv[0]);
228
}
229
230
if (conflict_detection()){
231
if(debug){
232
fprintf(stderr, "Stopping %s because of conflict", argv[0]);
233
}
234
return EXIT_FAILURE;
235
}
236
237
if(debug){
238
fprintf(stderr, "Storing current terminal attributes\n");
239
}
240
241
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
242
int e = errno;
243
error(0, errno, "tcgetattr");
244
switch(e){
245
case EBADF:
246
case ENOTTY:
247
return EX_UNAVAILABLE;
248
default:
249
return EX_OSERR;
250
}
251
}
252
253
sigemptyset(&new_action.sa_mask);
254
ret = sigaddset(&new_action.sa_mask, SIGINT);
255
if(ret == -1){
256
error(0, errno, "sigaddset");
257
return EX_OSERR;
258
}
259
ret = sigaddset(&new_action.sa_mask, SIGHUP);
260
if(ret == -1){
261
error(0, errno, "sigaddset");
262
return EX_OSERR;
263
}
264
ret = sigaddset(&new_action.sa_mask, SIGTERM);
265
if(ret == -1){
266
error(0, errno, "sigaddset");
267
return EX_OSERR;
268
}
269
/* Need to check if the handler is SIG_IGN before handling:
270
| [[info:libc:Initial Signal Actions]] |
271
| [[info:libc:Basic Signal Handling]] |
272
*/
273
ret = sigaction(SIGINT, NULL, &old_action);
274
if(ret == -1){
275
error(0, errno, "sigaction");
276
return EX_OSERR;
277
}
278
if(old_action.sa_handler != SIG_IGN){
279
ret = sigaction(SIGINT, &new_action, NULL);
280
if(ret == -1){
281
error(0, errno, "sigaction");
282
return EX_OSERR;
283
}
284
}
285
ret = sigaction(SIGHUP, NULL, &old_action);
286
if(ret == -1){
287
error(0, errno, "sigaction");
288
return EX_OSERR;
289
}
290
if(old_action.sa_handler != SIG_IGN){
291
ret = sigaction(SIGHUP, &new_action, NULL);
292
if(ret == -1){
293
error(0, errno, "sigaction");
294
return EX_OSERR;
295
}
296
}
297
ret = sigaction(SIGTERM, NULL, &old_action);
298
if(ret == -1){
299
error(0, errno, "sigaction");
300
return EX_OSERR;
301
}
302
if(old_action.sa_handler != SIG_IGN){
303
ret = sigaction(SIGTERM, &new_action, NULL);
304
if(ret == -1){
305
error(0, errno, "sigaction");
306
return EX_OSERR;
307
}
308
}
309
310
311
if(debug){
312
fprintf(stderr, "Removing echo flag from terminal attributes\n");
313
}
314
315
t_new = t_old;
316
t_new.c_lflag &= ~(tcflag_t)ECHO;
317
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
318
int e = errno;
319
error(0, errno, "tcsetattr-echo");
320
switch(e){
321
case EBADF:
322
case ENOTTY:
323
return EX_UNAVAILABLE;
324
case EINVAL:
325
default:
326
return EX_OSERR;
327
}
328
}
329
330
if(debug){
331
fprintf(stderr, "Waiting for input from stdin \n");
332
}
333
while(true){
334
if(quit_now){
335
if(debug){
336
fprintf(stderr, "Interrupted by signal, exiting.\n");
337
}
338
status = EXIT_FAILURE;
339
break;
340
}
341
342
if(prefix){
343
fprintf(stderr, "%s ", prefix);
344
}
345
{
346
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
347
const char *crypttarget = getenv("CRYPTTAB_NAME");
348
/* Before cryptsetup 1.1.0~rc2 */
349
if(cryptsource == NULL){
350
cryptsource = getenv("cryptsource");
351
}
352
if(crypttarget == NULL){
353
crypttarget = getenv("crypttarget");
354
}
355
const char *const prompt1 = "Unlocking the disk";
356
const char *const prompt2 = "Enter passphrase";
357
if(cryptsource == NULL){
358
if(crypttarget == NULL){
359
fprintf(stderr, "%s to unlock the disk: ", prompt2);
360
} else {
361
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
362
prompt2);
363
}
364
} else {
365
if(crypttarget == NULL){
366
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
367
prompt2);
368
} else {
369
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
370
crypttarget, prompt2);
371
}
372
}
373
}
374
sret = getline(&buffer, &n, stdin);
375
if(sret > 0){
376
status = EXIT_SUCCESS;
377
/* Make n = data size instead of allocated buffer size */
378
n = (size_t)sret;
379
/* Strip final newline */
380
if(n > 0 and buffer[n-1] == '\n'){
381
buffer[n-1] = '\0'; /* not strictly necessary */
382
n--;
383
}
384
size_t written = 0;
385
while(written < n){
386
sret = write(STDOUT_FILENO, buffer + written, n - written);
387
if(sret < 0){
388
int e = errno;
389
error(0, errno, "write");
390
switch(e){
391
case EBADF:
392
case EFAULT:
393
case EINVAL:
394
case EFBIG:
395
case EIO:
396
case ENOSPC:
397
default:
398
status = EX_IOERR;
399
break;
400
case EINTR:
401
status = EXIT_FAILURE;
402
break;
403
}
404
break;
405
}
406
written += (size_t)sret;
407
}
408
sret = close(STDOUT_FILENO);
409
if(sret == -1){
410
int e = errno;
411
error(0, errno, "close");
412
switch(e){
413
case EBADF:
414
status = EX_OSFILE;
415
break;
416
case EIO:
417
default:
418
status = EX_IOERR;
419
break;
420
}
421
}
422
break;
423
}
424
if(sret < 0){
425
int e = errno;
426
if(errno != EINTR and not feof(stdin)){
427
error(0, errno, "getline");
428
switch(e){
429
case EBADF:
430
status = EX_UNAVAILABLE;
431
case EIO:
432
case EINVAL:
433
default:
434
status = EX_IOERR;
435
break;
436
}
437
break;
438
}
439
}
440
/* if(sret == 0), then the only sensible thing to do is to retry to
441
read from stdin */
442
fputc('\n', stderr);
443
if(debug and not quit_now){
444
/* If quit_now is nonzero, we were interrupted by a signal, and
445
will print that later, so no need to show this too. */
446
fprintf(stderr, "getline() returned 0, retrying.\n");
447
}
448
}
449
450
free(buffer);
451
452
if(debug){
453
fprintf(stderr, "Restoring terminal attributes\n");
454
}
455
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
456
error(0, errno, "tcsetattr+echo");
457
}
458
459
if(quit_now){
460
sigemptyset(&old_action.sa_mask);
461
old_action.sa_handler = SIG_DFL;
462
ret = sigaction(signal_received, &old_action, NULL);
463
if(ret == -1){
464
error(0, errno, "sigaction");
465
}
466
raise(signal_received);
467
}
468
469
if(debug){
470
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
471
status);
472
}
473
if(status == EXIT_SUCCESS or status == EX_OK){
474
fputc('\n', stderr);
475
}
476
477
return status;
478
}
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