To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/passprompt.c
- browse files at revision 24.1.4
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.4
- Committer: Björn Påhlsson
- Date: 2008-07-30 02:11:33 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 30.
- Revision ID: belorn@braxen-20080730021133-q341llq93r328q5b
Added optional parameters certdir, certkey and certfile that can be iven at start in the command line.
- 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 -*- */
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Password-prompt - Read a password from the terminal and print it
4
*
5
* Copyright © 2008-2018 Teddy Hogeborn
6
* Copyright © 2008-2018 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
3
* Passprompt - Read a password from the terminal and print it
4
*
5
* Copyright © 2007-2008 Teddy Hogeborn and Björn Påhlsson.
6
*
7
* This program is free software: you can redistribute it and/or
8
* modify it under the terms of the GNU General Public License as
9
* published by the Free Software Foundation, either version 3 of the
10
* License, or (at your option) any later version.
11
*
12
* This program is distributed in the hope that it will be useful, but
16
13
* WITHOUT ANY WARRANTY; without even the implied warranty of
17
14
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18
15
* General Public License for more details.
19
16
*
20
17
* You should have received a copy of the GNU General Public License
21
* along with Mandos. If not, see <http://www.gnu.org/licenses/>.
18
* along with this program. If not, see
19
* <http://www.gnu.org/licenses/>.
22
20
*
23
* Contact the authors at <mandos@recompile.se>.
21
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
22
* <https://www.fukt.bsnet.se/~teddy/>.
24
23
*/
25
24
26
#define _GNU_SOURCE /* getline(), asprintf() */
25
#define _GNU_SOURCE /* getline() */
26
#define _FORTIFY_SOURCE 2
27
27
28
#include <termios.h> /* struct termios, tcsetattr(),
28
#include <termios.h> /* struct termios, tcsetattr(),
29
29
TCSAFLUSH, tcgetattr(), ECHO */
30
30
#include <unistd.h> /* struct termios, tcsetattr(),
31
31
STDIN_FILENO, TCSAFLUSH,
32
tcgetattr(), ECHO, readlink() */
32
tcgetattr(), ECHO */
33
33
#include <signal.h> /* sig_atomic_t, raise(), struct
34
34
sigaction, sigemptyset(),
35
35
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() */
36
SIGQUIT, SIGHUP, SIGTERM */
37
#include <stddef.h> /* NULL, size_t */
38
#include <sys/types.h> /* ssize_t */
41
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
42
getenv(), free() */
43
#include <dirent.h> /* scandir(), alphasort() */
40
getopt_long */
44
41
#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() */
42
stdin, feof(), perror(), fputc(),
43
stdout, getopt_long */
44
#include <errno.h> /* errno, EINVAL */
51
45
#include <iso646.h> /* or, not */
52
46
#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(), ... */
47
#include <string.h> /* strlen, rindex, strncmp, strcmp */
48
#include <getopt.h> /* getopt_long */
66
49
67
volatile sig_atomic_t quit_now = 0;
68
int signal_received;
50
volatile bool quit_now = false;
69
51
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
52
53
void termination_handler(__attribute__((unused))int signum){
54
quit_now = true;
55
}
229
56
230
57
int main(int argc, char **argv){
231
ssize_t sret;
232
int ret;
58
ssize_t ret;
233
59
size_t n;
234
60
struct termios t_new, t_old;
235
61
char *buffer = NULL;
238
64
struct sigaction old_action,
239
65
new_action = { .sa_handler = termination_handler,
240
66
.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;
67
68
while (true){
69
static struct option long_options[] = {
70
{"debug", no_argument, (int *)&debug, 1},
71
{"prefix", required_argument, 0, 'p'},
72
{0, 0, 0, 0} };
73
74
int option_index = 0;
75
ret = getopt_long (argc, argv, "p:", long_options, &option_index);
76
77
if (ret == -1){
78
break;
288
79
}
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);
80
296
81
switch(ret){
297
82
case 0:
298
83
break;
299
case ENOMEM:
84
case 'p':
85
prefix = optarg;
86
break;
300
87
default:
301
errno = ret;
302
error_plus(0, errno, "argp_parse");
303
return EX_OSERR;
304
case EINVAL:
305
return EX_USAGE;
88
fprintf(stderr, "bad arguments\n");
89
exit(EXIT_FAILURE);
306
90
}
307
91
}
308
309
if(debug){
92
93
if (debug){
310
94
fprintf(stderr, "Starting %s\n", argv[0]);
311
95
}
312
313
if(conflict_detection()){
314
if(debug){
315
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
316
}
317
return EXIT_FAILURE;
318
}
319
320
if(debug){
96
if (debug){
321
97
fprintf(stderr, "Storing current terminal attributes\n");
322
98
}
323
99
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
}
100
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
101
return EXIT_FAILURE;
334
102
}
335
103
336
104
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){
105
sigaddset(&new_action.sa_mask, SIGINT);
106
sigaddset(&new_action.sa_mask, SIGQUIT);
107
sigaddset(&new_action.sa_mask, SIGHUP);
108
sigaddset(&new_action.sa_mask, SIGTERM);
109
sigaction(SIGINT, NULL, &old_action);
110
if (old_action.sa_handler != SIG_IGN)
111
sigaction(SIGINT, &new_action, NULL);
112
sigaction(SIGQUIT, NULL, &old_action);
113
if (old_action.sa_handler != SIG_IGN)
114
sigaction(SIGQUIT, &new_action, NULL);
115
sigaction(SIGHUP, NULL, &old_action);
116
if (old_action.sa_handler != SIG_IGN)
117
sigaction(SIGHUP, &new_action, NULL);
118
sigaction(SIGTERM, NULL, &old_action);
119
if (old_action.sa_handler != SIG_IGN)
120
sigaction(SIGTERM, &new_action, NULL);
121
122
123
if (debug){
395
124
fprintf(stderr, "Removing echo flag from terminal attributes\n");
396
125
}
397
126
398
127
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
}
128
t_new.c_lflag &= ~ECHO;
129
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
130
perror("tcsetattr-echo");
131
return EXIT_FAILURE;
411
132
}
412
413
if(debug){
133
134
if (debug){
414
135
fprintf(stderr, "Waiting for input from stdin \n");
415
136
}
416
137
while(true){
417
if(quit_now){
418
if(debug){
419
fprintf(stderr, "Interrupted by signal, exiting.\n");
420
}
138
if (quit_now){
421
139
status = EXIT_FAILURE;
422
140
break;
423
141
}
424
142
425
143
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){
144
fprintf(stderr, "%s Password: ", prefix);
145
} else {
146
fprintf(stderr, "Password: ");
147
}
148
ret = getline(&buffer, &n, stdin);
149
if (ret > 0){
150
fprintf(stdout, "%s", buffer);
459
151
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
152
break;
506
153
}
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
}
154
// ret == 0 makes no other sence than to retry to read from stdin
155
if (ret < 0){
156
if (errno != EINTR and not feof(stdin)){
157
perror("getline");
158
status = EXIT_FAILURE;
521
159
break;
522
160
}
523
161
}
524
/* if(sret == 0), then the only sensible thing to do is to retry
525
to read from stdin */
526
162
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
163
}
533
534
free(buffer);
535
536
if(debug){
164
165
if (debug){
537
166
fprintf(stderr, "Restoring terminal attributes\n");
538
167
}
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);
168
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
169
perror("tcsetattr+echo");
170
}
171
172
if (debug){
173
fprintf(stderr, "%s is exiting\n", argv[0]);
559
174
}
560
175
561
176
return status;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0