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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
- network-hooks.d
- 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 © 2008-2013 Teddy Hogeborn
6
* Copyright © 2008-2013 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(),
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,
39
ssize_t, open() */
40
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
41
getenv(), free() */
42
#include <dirent.h> /* scandir(), alphasort() */
43
#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() */
50
#include <iso646.h> /* or, not */
51
#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
__attribute__((format (gnu_printf, 2, 3), nonnull(1)))
76
int fprintf_plus(FILE *stream, const char *format, ...){
77
va_list ap;
78
va_start (ap, format);
79
80
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
81
program_invocation_short_name));
82
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
83
}
84
85
/* Function to use when printing errors */
86
__attribute__((format (gnu_printf, 3, 4)))
87
void error_plus(int status, int errnum, const char *formatstring,
88
...){
89
va_list ap;
90
char *text;
91
int ret;
92
93
va_start(ap, formatstring);
94
ret = vasprintf(&text, formatstring, ap);
95
if (ret == -1){
96
fprintf(stderr, "Mandos plugin %s: ",
97
program_invocation_short_name);
98
vfprintf(stderr, formatstring, ap);
99
fprintf(stderr, ": %s\n", strerror(errnum));
100
error(status, errno, "vasprintf while printing error");
101
return;
102
}
103
fprintf(stderr, "Mandos plugin ");
104
error(status, errnum, "%s", text);
105
free(text);
106
}
107
108
static void termination_handler(int signum){
109
if(quit_now){
110
return;
111
}
112
quit_now = 1;
113
signal_received = signum;
114
}
115
116
bool conflict_detection(void){
117
118
/* plymouth conflicts with password-prompt since both want to read
119
from the terminal. Password-prompt will exit if it detects
120
plymouth since plymouth performs the same functionality.
121
*/
122
__attribute__((nonnull))
123
int is_plymouth(const struct dirent *proc_entry){
124
int ret;
125
int cl_fd;
126
{
127
uintmax_t proc_id;
128
char *tmp;
129
errno = 0;
130
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
131
132
if(errno != 0 or *tmp != '\0'
133
or proc_id != (uintmax_t)((pid_t)proc_id)){
134
return 0;
135
}
136
}
137
138
char *cmdline_filename;
139
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
140
proc_entry->d_name);
141
if(ret == -1){
142
error_plus(0, errno, "asprintf");
143
return 0;
144
}
145
146
/* Open /proc/<pid>/cmdline */
147
cl_fd = open(cmdline_filename, O_RDONLY);
148
free(cmdline_filename);
149
if(cl_fd == -1){
150
if(errno != ENOENT){
151
error_plus(0, errno, "open");
152
}
153
return 0;
154
}
155
156
char *cmdline = NULL;
157
{
158
size_t cmdline_len = 0;
159
size_t cmdline_allocated = 0;
160
char *tmp;
161
const size_t blocksize = 1024;
162
ssize_t sret;
163
do {
164
/* Allocate more space? */
165
if(cmdline_len + blocksize + 1 > cmdline_allocated){
166
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
167
if(tmp == NULL){
168
error_plus(0, errno, "realloc");
169
free(cmdline);
170
close(cl_fd);
171
return 0;
172
}
173
cmdline = tmp;
174
cmdline_allocated += blocksize;
175
}
176
177
/* Read data */
178
sret = read(cl_fd, cmdline + cmdline_len,
179
cmdline_allocated - cmdline_len);
180
if(sret == -1){
181
error_plus(0, errno, "read");
182
free(cmdline);
183
close(cl_fd);
184
return 0;
185
}
186
cmdline_len += (size_t)sret;
187
} while(sret != 0);
188
ret = close(cl_fd);
189
if(ret == -1){
190
error_plus(0, errno, "close");
191
free(cmdline);
192
return 0;
193
}
194
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
195
}
196
/* we now have cmdline */
197
198
/* get basename */
199
char *cmdline_base = strrchr(cmdline, '/');
200
if(cmdline_base != NULL){
201
cmdline_base += 1; /* skip the slash */
202
} else {
203
cmdline_base = cmdline;
204
}
205
206
if(strcmp(cmdline_base, plymouth_name) != 0){
207
if(debug){
208
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
209
plymouth_name);
210
}
211
free(cmdline);
212
return 0;
213
}
214
if(debug){
215
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
216
plymouth_name);
217
}
218
free(cmdline);
219
return 1;
220
}
221
222
struct dirent **direntries = NULL;
223
int ret;
224
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
225
if (ret == -1){
226
error_plus(1, errno, "scandir");
227
}
228
free(direntries);
229
return ret > 0;
230
}
231
232
233
int main(int argc, char **argv){
234
ssize_t sret;
235
int ret;
236
size_t n;
237
struct termios t_new, t_old;
238
char *buffer = NULL;
239
char *prefix = NULL;
240
int status = EXIT_SUCCESS;
241
struct sigaction old_action,
242
new_action = { .sa_handler = termination_handler,
243
.sa_flags = 0 };
244
{
245
struct argp_option options[] = {
246
{ .name = "prefix", .key = 'p',
247
.arg = "PREFIX", .flags = 0,
248
.doc = "Prefix shown before the prompt", .group = 2 },
249
{ .name = "debug", .key = 128,
250
.doc = "Debug mode", .group = 3 },
251
/*
252
* These reproduce what we would get without ARGP_NO_HELP
253
*/
254
{ .name = "help", .key = '?',
255
.doc = "Give this help list", .group = -1 },
256
{ .name = "usage", .key = -3,
257
.doc = "Give a short usage message", .group = -1 },
258
{ .name = "version", .key = 'V',
259
.doc = "Print program version", .group = -1 },
260
{ .name = NULL }
261
};
262
263
__attribute__((nonnull(3)))
264
error_t parse_opt (int key, char *arg, struct argp_state *state){
265
errno = 0;
266
switch (key){
267
case 'p':
268
prefix = arg;
269
break;
270
case 128:
271
debug = true;
272
break;
273
/*
274
* These reproduce what we would get without ARGP_NO_HELP
275
*/
276
case '?': /* --help */
277
argp_state_help(state, state->out_stream,
278
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
279
& ~(unsigned int)ARGP_HELP_EXIT_OK);
280
case -3: /* --usage */
281
argp_state_help(state, state->out_stream,
282
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
283
case 'V': /* --version */
284
fprintf(state->out_stream, "%s\n", argp_program_version);
285
exit(argp_err_exit_status);
286
break;
287
default:
288
return ARGP_ERR_UNKNOWN;
289
}
290
return errno;
291
}
292
293
struct argp argp = { .options = options, .parser = parse_opt,
294
.args_doc = "",
295
.doc = "Mandos password-prompt -- Read and"
296
" output a password" };
297
ret = argp_parse(&argp, argc, argv,
298
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
299
switch(ret){
300
case 0:
301
break;
302
case ENOMEM:
303
default:
304
errno = ret;
305
error_plus(0, errno, "argp_parse");
306
return EX_OSERR;
307
case EINVAL:
308
return EX_USAGE;
309
}
310
}
311
312
if(debug){
313
fprintf(stderr, "Starting %s\n", argv[0]);
314
}
315
316
if (conflict_detection()){
317
if(debug){
318
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
319
}
320
return EXIT_FAILURE;
321
}
322
323
if(debug){
324
fprintf(stderr, "Storing current terminal attributes\n");
325
}
326
327
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
328
int e = errno;
329
error_plus(0, errno, "tcgetattr");
330
switch(e){
331
case EBADF:
332
case ENOTTY:
333
return EX_UNAVAILABLE;
334
default:
335
return EX_OSERR;
336
}
337
}
338
339
sigemptyset(&new_action.sa_mask);
340
ret = sigaddset(&new_action.sa_mask, SIGINT);
341
if(ret == -1){
342
error_plus(0, errno, "sigaddset");
343
return EX_OSERR;
344
}
345
ret = sigaddset(&new_action.sa_mask, SIGHUP);
346
if(ret == -1){
347
error_plus(0, errno, "sigaddset");
348
return EX_OSERR;
349
}
350
ret = sigaddset(&new_action.sa_mask, SIGTERM);
351
if(ret == -1){
352
error_plus(0, errno, "sigaddset");
353
return EX_OSERR;
354
}
355
/* Need to check if the handler is SIG_IGN before handling:
356
| [[info:libc:Initial Signal Actions]] |
357
| [[info:libc:Basic Signal Handling]] |
358
*/
359
ret = sigaction(SIGINT, NULL, &old_action);
360
if(ret == -1){
361
error_plus(0, errno, "sigaction");
362
return EX_OSERR;
363
}
364
if(old_action.sa_handler != SIG_IGN){
365
ret = sigaction(SIGINT, &new_action, NULL);
366
if(ret == -1){
367
error_plus(0, errno, "sigaction");
368
return EX_OSERR;
369
}
370
}
371
ret = sigaction(SIGHUP, NULL, &old_action);
372
if(ret == -1){
373
error_plus(0, errno, "sigaction");
374
return EX_OSERR;
375
}
376
if(old_action.sa_handler != SIG_IGN){
377
ret = sigaction(SIGHUP, &new_action, NULL);
378
if(ret == -1){
379
error_plus(0, errno, "sigaction");
380
return EX_OSERR;
381
}
382
}
383
ret = sigaction(SIGTERM, NULL, &old_action);
384
if(ret == -1){
385
error_plus(0, errno, "sigaction");
386
return EX_OSERR;
387
}
388
if(old_action.sa_handler != SIG_IGN){
389
ret = sigaction(SIGTERM, &new_action, NULL);
390
if(ret == -1){
391
error_plus(0, errno, "sigaction");
392
return EX_OSERR;
393
}
394
}
395
396
397
if(debug){
398
fprintf(stderr, "Removing echo flag from terminal attributes\n");
399
}
400
401
t_new = t_old;
402
t_new.c_lflag &= ~(tcflag_t)ECHO;
403
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
404
int e = errno;
405
error_plus(0, errno, "tcsetattr-echo");
406
switch(e){
407
case EBADF:
408
case ENOTTY:
409
return EX_UNAVAILABLE;
410
case EINVAL:
411
default:
412
return EX_OSERR;
413
}
414
}
415
416
if(debug){
417
fprintf(stderr, "Waiting for input from stdin \n");
418
}
419
while(true){
420
if(quit_now){
421
if(debug){
422
fprintf(stderr, "Interrupted by signal, exiting.\n");
423
}
424
status = EXIT_FAILURE;
425
break;
426
}
427
428
if(prefix){
429
fprintf(stderr, "%s ", prefix);
430
}
431
{
432
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
433
const char *crypttarget = getenv("CRYPTTAB_NAME");
434
/* Before cryptsetup 1.1.0~rc2 */
435
if(cryptsource == NULL){
436
cryptsource = getenv("cryptsource");
437
}
438
if(crypttarget == NULL){
439
crypttarget = getenv("crypttarget");
440
}
441
const char *const prompt1 = "Unlocking the disk";
442
const char *const prompt2 = "Enter passphrase";
443
if(cryptsource == NULL){
444
if(crypttarget == NULL){
445
fprintf(stderr, "%s to unlock the disk: ", prompt2);
446
} else {
447
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
448
prompt2);
449
}
450
} else {
451
if(crypttarget == NULL){
452
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
453
prompt2);
454
} else {
455
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
456
crypttarget, prompt2);
457
}
458
}
459
}
460
sret = getline(&buffer, &n, stdin);
461
if(sret > 0){
462
status = EXIT_SUCCESS;
463
/* Make n = data size instead of allocated buffer size */
464
n = (size_t)sret;
465
/* Strip final newline */
466
if(n > 0 and buffer[n-1] == '\n'){
467
buffer[n-1] = '\0'; /* not strictly necessary */
468
n--;
469
}
470
size_t written = 0;
471
while(written < n){
472
sret = write(STDOUT_FILENO, buffer + written, n - written);
473
if(sret < 0){
474
int e = errno;
475
error_plus(0, errno, "write");
476
switch(e){
477
case EBADF:
478
case EFAULT:
479
case EINVAL:
480
case EFBIG:
481
case EIO:
482
case ENOSPC:
483
default:
484
status = EX_IOERR;
485
break;
486
case EINTR:
487
status = EXIT_FAILURE;
488
break;
489
}
490
break;
491
}
492
written += (size_t)sret;
493
}
494
sret = close(STDOUT_FILENO);
495
if(sret == -1){
496
int e = errno;
497
error_plus(0, errno, "close");
498
switch(e){
499
case EBADF:
500
status = EX_OSFILE;
501
break;
502
case EIO:
503
default:
504
status = EX_IOERR;
505
break;
506
}
507
}
508
break;
509
}
510
if(sret < 0){
511
int e = errno;
512
if(errno != EINTR and not feof(stdin)){
513
error_plus(0, errno, "getline");
514
switch(e){
515
case EBADF:
516
status = EX_UNAVAILABLE;
517
break;
518
case EIO:
519
case EINVAL:
520
default:
521
status = EX_IOERR;
522
break;
523
}
524
break;
525
}
526
}
527
/* if(sret == 0), then the only sensible thing to do is to retry
528
to read from stdin */
529
fputc('\n', stderr);
530
if(debug and not quit_now){
531
/* If quit_now is nonzero, we were interrupted by a signal, and
532
will print that later, so no need to show this too. */
533
fprintf(stderr, "getline() returned 0, retrying.\n");
534
}
535
}
536
537
free(buffer);
538
539
if(debug){
540
fprintf(stderr, "Restoring terminal attributes\n");
541
}
542
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
543
error_plus(0, errno, "tcsetattr+echo");
544
}
545
546
if(quit_now){
547
sigemptyset(&old_action.sa_mask);
548
old_action.sa_handler = SIG_DFL;
549
ret = sigaction(signal_received, &old_action, NULL);
550
if(ret == -1){
551
error_plus(0, errno, "sigaction");
552
}
553
raise(signal_received);
554
}
555
556
if(debug){
557
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
558
status);
559
}
560
if(status == EXIT_SUCCESS or status == EX_OK){
561
fputc('\n', stderr);
562
}
563
564
return status;
565
}
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