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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
- debian/tests
- debian/upstream
- dracut-module
- 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 © 2008-2019, 2021 Teddy Hogeborn
6
* Copyright © 2008-2019, 2021 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 /* vasprintf(),
27
program_invocation_short_name,
28
asprintf(), getline() */
29
#include <sys/types.h> /* sig_atomic_t, pid_t */
1
#define _GNU_SOURCE /* getline() */
2
#define _FORTIFY_SOURCE 2
3
#include <termios.h> /* struct termios, tcsetattr(),
4
TCSAFLUSH, tcgetattr(), ECHO */
5
#include <unistd.h> /* struct termios, tcsetattr(),
6
STDIN_FILENO, TCSAFLUSH,
7
tcgetattr(), ECHO */
8
#include <signal.h> /* sig_atomic_t, raise(), struct
9
sigaction, sigemptyset(),
10
sigaction(), sigaddset(), SIGINT,
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 */
15
#include <stdio.h> /* fprintf(), stderr, getline(),
16
stdin, feof(), perror(), fputc(),
17
stdout */
18
#include <errno.h> /* errno, EINVAL */
19
#include <iso646.h> /* or, not */
30
20
#include <stdbool.h> /* bool, false, true */
31
#include <argp.h> /* argp_program_version,
32
argp_program_bug_address,
33
struct argp_option,
34
struct argp_state, argp_state_help,
35
ARGP_HELP_STD_HELP,
36
ARGP_HELP_EXIT_ERR,
37
ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,
38
argp_err_exit_status,
39
ARGP_ERR_UNKNOWN, argp_parse(),
40
ARGP_IN_ORDER, ARGP_NO_HELP */
41
#include <stdarg.h> /* va_list, va_start(), vfprintf() */
42
#include <stdio.h> /* vasprintf(), fprintf(), stderr,
43
vfprintf(), asprintf(), getline(),
44
stdin, feof(), clearerr(),
45
fputc() */
46
#include <errno.h> /* program_invocation_short_name,
47
errno, ENOENT, error_t, ENOMEM,
48
EINVAL, EBADF, ENOTTY, EFAULT,
49
EFBIG, EIO, ENOSPC, EINTR */
50
#include <string.h> /* strerror(), strrchr(), strcmp() */
51
#include <error.h> /* error() */
52
#include <stdlib.h> /* free(), realloc(), EXIT_SUCCESS,
53
EXIT_FAILURE, getenv() */
54
#include <unistd.h> /* access(), R_OK, ssize_t, close(),
55
read(), STDIN_FILENO, write(),
56
STDOUT_FILENO */
57
#include <dirent.h> /* struct dirent, scandir(),
58
alphasort() */
59
#include <inttypes.h> /* uintmax_t, strtoumax() */
60
#include <iso646.h> /* or, and, not */
61
#include <fcntl.h> /* open(), O_RDONLY */
62
#include <stddef.h> /* NULL, size_t */
63
#include <termios.h> /* struct termios, tcgetattr(),
64
tcflag_t, ECHO, tcsetattr(),
65
TCSAFLUSH */
66
#include <signal.h> /* struct sigaction, sigemptyset(),
67
sigaddset(), SIGINT, SIGHUP,
68
SIGTERM, SIG_IGN, SIG_DFL,
69
raise() */
70
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
71
EX_IOERR, EX_OSFILE, EX_OK */
72
73
volatile sig_atomic_t quit_now = 0;
74
int signal_received;
75
bool debug = false;
76
const char *argp_program_version = "password-prompt " VERSION;
77
const char *argp_program_bug_address = "<mandos@recompile.se>";
78
79
/* Needed for conflict resolution */
80
const char plymouth_name[] = "plymouthd";
81
82
/* Function to use when printing errors */
83
__attribute__((format (gnu_printf, 3, 4)))
84
void error_plus(int status, int errnum, const char *formatstring,
85
...){
86
va_list ap;
87
char *text;
88
int ret;
89
90
va_start(ap, formatstring);
91
ret = vasprintf(&text, formatstring, ap);
92
if(ret == -1){
93
fprintf(stderr, "Mandos plugin %s: ",
94
program_invocation_short_name);
95
vfprintf(stderr, formatstring, ap);
96
fprintf(stderr, ": %s\n", strerror(errnum));
97
error(status, errno, "vasprintf while printing error");
98
return;
99
}
100
fprintf(stderr, "Mandos plugin ");
101
error(status, errnum, "%s", text);
102
free(text);
103
}
104
105
static void termination_handler(int signum){
106
if(quit_now){
107
return;
108
}
109
quit_now = 1;
110
signal_received = signum;
111
}
112
113
bool conflict_detection(void){
114
115
/* plymouth conflicts with password-prompt since both want to read
116
from the terminal. Password-prompt will exit if it detects
117
plymouth since plymouth performs the same functionality.
118
*/
119
if(access("/run/plymouth/pid", R_OK) == 0){
120
return true;
121
}
122
123
__attribute__((nonnull))
124
int is_plymouth(const struct dirent *proc_entry){
125
int ret;
126
int cl_fd;
127
{
128
uintmax_t proc_id;
129
char *tmp;
130
errno = 0;
131
proc_id = strtoumax(proc_entry->d_name, &tmp, 10);
132
133
if(errno != 0 or *tmp != '\0'
134
or proc_id != (uintmax_t)((pid_t)proc_id)){
135
return 0;
136
}
137
}
138
139
char *cmdline_filename;
140
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
141
proc_entry->d_name);
142
if(ret == -1){
143
error_plus(0, errno, "asprintf");
144
return 0;
145
}
146
147
/* Open /proc/<pid>/cmdline */
148
cl_fd = open(cmdline_filename, O_RDONLY);
149
free(cmdline_filename);
150
if(cl_fd == -1){
151
if(errno != ENOENT){
152
error_plus(0, errno, "open");
153
}
154
return 0;
155
}
156
157
char *cmdline = NULL;
158
{
159
size_t cmdline_len = 0;
160
size_t cmdline_allocated = 0;
161
char *tmp;
162
const size_t blocksize = 1024;
163
ssize_t sret;
164
do {
165
/* Allocate more space? */
166
if(cmdline_len + blocksize + 1 > cmdline_allocated){
167
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
168
if(tmp == NULL){
169
error_plus(0, errno, "realloc");
170
free(cmdline);
171
close(cl_fd);
172
return 0;
173
}
174
cmdline = tmp;
175
cmdline_allocated += blocksize;
176
}
177
178
/* Read data */
179
sret = read(cl_fd, cmdline + cmdline_len,
180
cmdline_allocated - cmdline_len);
181
if(sret == -1){
182
error_plus(0, errno, "read");
183
free(cmdline);
184
close(cl_fd);
185
return 0;
186
}
187
cmdline_len += (size_t)sret;
188
} while(sret != 0);
189
ret = close(cl_fd);
190
if(ret == -1){
191
error_plus(0, errno, "close");
192
free(cmdline);
193
return 0;
194
}
195
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
196
}
197
/* we now have cmdline */
198
199
/* get basename */
200
char *cmdline_base = strrchr(cmdline, '/');
201
if(cmdline_base != NULL){
202
cmdline_base += 1; /* skip the slash */
203
} else {
204
cmdline_base = cmdline;
205
}
206
207
if(strcmp(cmdline_base, plymouth_name) != 0){
208
if(debug){
209
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
210
plymouth_name);
211
}
212
free(cmdline);
213
return 0;
214
}
215
if(debug){
216
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
217
plymouth_name);
218
}
219
free(cmdline);
220
return 1;
221
}
222
223
struct dirent **direntries = NULL;
224
int ret;
225
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
226
if(ret == -1){
227
error_plus(1, errno, "scandir");
228
}
229
{
230
int i = ret;
231
while(i--){
232
free(direntries[i]);
233
}
234
}
235
free(direntries);
236
return ret > 0;
237
}
238
21
22
volatile bool quit_now = false;
23
24
void termination_handler(int signum){
25
quit_now = true;
26
}
239
27
240
28
int main(int argc, char **argv){
241
ssize_t sret;
242
int ret;
29
ssize_t ret = -1;
243
30
size_t n;
244
31
struct termios t_new, t_old;
245
32
char *buffer = NULL;
246
char *prefix = NULL;
247
char *prompt = NULL;
248
33
int status = EXIT_SUCCESS;
249
34
struct sigaction old_action,
250
35
new_action = { .sa_handler = termination_handler,
251
36
.sa_flags = 0 };
252
{
253
struct argp_option options[] = {
254
{ .name = "prefix", .key = 'p',
255
.arg = "PREFIX", .flags = 0,
256
.doc = "Prefix shown before the prompt", .group = 2 },
257
{ .name = "prompt", .key = 129,
258
.arg = "PROMPT", .flags = 0,
259
.doc = "The prompt to show", .group = 2 },
260
{ .name = "debug", .key = 128,
261
.doc = "Debug mode", .group = 3 },
262
/*
263
* These reproduce what we would get without ARGP_NO_HELP
264
*/
265
{ .name = "help", .key = '?',
266
.doc = "Give this help list", .group = -1 },
267
{ .name = "usage", .key = -3,
268
.doc = "Give a short usage message", .group = -1 },
269
{ .name = "version", .key = 'V',
270
.doc = "Print program version", .group = -1 },
271
{ .name = NULL }
272
};
273
274
__attribute__((nonnull(3)))
275
error_t parse_opt (int key, char *arg, struct argp_state *state){
276
errno = 0;
277
switch (key){
278
case 'p': /* --prefix */
279
prefix = arg;
280
break;
281
case 128: /* --debug */
282
debug = true;
283
break;
284
case 129: /* --prompt */
285
prompt = arg;
286
break;
287
/*
288
* These reproduce what we would get without ARGP_NO_HELP
289
*/
290
case '?': /* --help */
291
argp_state_help(state, state->out_stream,
292
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
293
& ~(unsigned int)ARGP_HELP_EXIT_OK);
294
__builtin_unreachable();
295
case -3: /* --usage */
296
argp_state_help(state, state->out_stream,
297
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
298
__builtin_unreachable();
299
case 'V': /* --version */
300
fprintf(state->out_stream, "%s\n", argp_program_version);
301
exit(argp_err_exit_status);
302
break;
303
default:
304
return ARGP_ERR_UNKNOWN;
305
}
306
return errno;
307
}
308
309
struct argp argp = { .options = options, .parser = parse_opt,
310
.args_doc = "",
311
.doc = "Mandos password-prompt -- Read and"
312
" output a password" };
313
ret = argp_parse(&argp, argc, argv,
314
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
315
switch(ret){
316
case 0:
317
break;
318
case ENOMEM:
319
default:
320
errno = ret;
321
error_plus(0, errno, "argp_parse");
322
return EX_OSERR;
323
case EINVAL:
324
return EX_USAGE;
325
}
326
}
327
37
328
if(debug){
329
fprintf(stderr, "Starting %s\n", argv[0]);
330
}
331
332
if(conflict_detection()){
333
if(debug){
334
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
335
}
38
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
336
39
return EXIT_FAILURE;
337
40
}
338
41
339
if(debug){
340
fprintf(stderr, "Storing current terminal attributes\n");
341
}
342
343
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
344
int e = errno;
345
error_plus(0, errno, "tcgetattr");
346
switch(e){
347
case EBADF:
348
case ENOTTY:
349
return EX_UNAVAILABLE;
350
default:
351
return EX_OSERR;
352
}
353
}
354
355
42
sigemptyset(&new_action.sa_mask);
356
ret = sigaddset(&new_action.sa_mask, SIGINT);
357
if(ret == -1){
358
error_plus(0, errno, "sigaddset");
359
return EX_OSERR;
360
}
361
ret = sigaddset(&new_action.sa_mask, SIGHUP);
362
if(ret == -1){
363
error_plus(0, errno, "sigaddset");
364
return EX_OSERR;
365
}
366
ret = sigaddset(&new_action.sa_mask, SIGTERM);
367
if(ret == -1){
368
error_plus(0, errno, "sigaddset");
369
return EX_OSERR;
370
}
371
/* Need to check if the handler is SIG_IGN before handling:
372
| [[info:libc:Initial Signal Actions]] |
373
| [[info:libc:Basic Signal Handling]] |
374
*/
375
ret = sigaction(SIGINT, NULL, &old_action);
376
if(ret == -1){
377
error_plus(0, errno, "sigaction");
378
return EX_OSERR;
379
}
380
if(old_action.sa_handler != SIG_IGN){
381
ret = sigaction(SIGINT, &new_action, NULL);
382
if(ret == -1){
383
error_plus(0, errno, "sigaction");
384
return EX_OSERR;
385
}
386
}
387
ret = sigaction(SIGHUP, NULL, &old_action);
388
if(ret == -1){
389
error_plus(0, errno, "sigaction");
390
return EX_OSERR;
391
}
392
if(old_action.sa_handler != SIG_IGN){
393
ret = sigaction(SIGHUP, &new_action, NULL);
394
if(ret == -1){
395
error_plus(0, errno, "sigaction");
396
return EX_OSERR;
397
}
398
}
399
ret = sigaction(SIGTERM, NULL, &old_action);
400
if(ret == -1){
401
error_plus(0, errno, "sigaction");
402
return EX_OSERR;
403
}
404
if(old_action.sa_handler != SIG_IGN){
405
ret = sigaction(SIGTERM, &new_action, NULL);
406
if(ret == -1){
407
error_plus(0, errno, "sigaction");
408
return EX_OSERR;
409
}
410
}
411
412
413
if(debug){
414
fprintf(stderr, "Removing echo flag from terminal attributes\n");
415
}
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);
416
59
417
60
t_new = t_old;
418
t_new.c_lflag &= ~(tcflag_t)ECHO;
419
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
420
int e = errno;
421
error_plus(0, errno, "tcsetattr-echo");
422
switch(e){
423
case EBADF:
424
case ENOTTY:
425
return EX_UNAVAILABLE;
426
case EINVAL:
427
default:
428
return EX_OSERR;
429
}
61
t_new.c_lflag &= ~ECHO;
62
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
63
perror("tcsetattr-echo");
64
return EXIT_FAILURE;
430
65
}
431
66
432
if(debug){
433
fprintf(stderr, "Waiting for input from stdin \n");
434
}
435
67
while(true){
436
if(quit_now){
437
if(debug){
438
fprintf(stderr, "Interrupted by signal, exiting.\n");
439
}
68
if (quit_now){
440
69
status = EXIT_FAILURE;
441
70
break;
442
71
}
443
444
if(prefix){
445
fprintf(stderr, "%s ", prefix);
446
}
447
if(prompt != NULL){
448
fprintf(stderr, "%s: ", prompt);
449
} else {
450
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
451
const char *crypttarget = getenv("CRYPTTAB_NAME");
452
/* Before cryptsetup 1.1.0~rc2 */
453
if(cryptsource == NULL){
454
cryptsource = getenv("cryptsource");
455
}
456
if(crypttarget == NULL){
457
crypttarget = getenv("crypttarget");
458
}
459
const char *const prompt1 = "Unlocking the disk";
460
const char *const prompt2 = "Enter passphrase";
461
if(cryptsource == NULL){
462
if(crypttarget == NULL){
463
fprintf(stderr, "%s to unlock the disk: ", prompt2);
464
} else {
465
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
466
prompt2);
467
}
468
} else {
469
if(crypttarget == NULL){
470
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
471
prompt2);
472
} else {
473
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
474
crypttarget, prompt2);
475
}
476
}
477
}
478
sret = getline(&buffer, &n, stdin);
479
if(sret > 0){
72
fprintf(stderr, "Password: ");
73
ret = getline(&buffer, &n, stdin);
74
if (ret > 0){
75
fprintf(stdout, "%s", buffer);
480
76
status = EXIT_SUCCESS;
481
/* Make n = data size instead of allocated buffer size */
482
n = (size_t)sret;
483
/* Strip final newline */
484
if(n > 0 and buffer[n-1] == '\n'){
485
buffer[n-1] = '\0'; /* not strictly necessary */
486
n--;
487
}
488
size_t written = 0;
489
while(written < n){
490
sret = write(STDOUT_FILENO, buffer + written, n - written);
491
if(sret < 0){
492
int e = errno;
493
error_plus(0, errno, "write");
494
switch(e){
495
case EBADF:
496
case EFAULT:
497
case EINVAL:
498
case EFBIG:
499
case EIO:
500
case ENOSPC:
501
default:
502
status = EX_IOERR;
503
break;
504
case EINTR:
505
status = EXIT_FAILURE;
506
break;
507
}
508
break;
509
}
510
written += (size_t)sret;
511
}
512
sret = close(STDOUT_FILENO);
513
if(sret == -1){
514
int e = errno;
515
error_plus(0, errno, "close");
516
switch(e){
517
case EBADF:
518
status = EX_OSFILE;
519
break;
520
case EIO:
521
default:
522
status = EX_IOERR;
523
break;
524
}
525
}
526
77
break;
527
78
}
528
if(sret < 0){
529
int e = errno;
530
if(errno != EINTR){
531
if(not feof(stdin)){
532
error_plus(0, errno, "getline");
533
switch(e){
534
case EBADF:
535
status = EX_UNAVAILABLE;
536
break;
537
case EIO:
538
case EINVAL:
539
default:
540
status = EX_IOERR;
541
break;
542
}
543
break;
544
} else {
545
clearerr(stdin);
546
}
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;
84
break;
547
85
}
548
86
}
549
/* if(sret == 0), then the only sensible thing to do is to retry
550
to read from stdin */
551
fputc('\n', stderr);
552
if(debug and not quit_now){
553
/* If quit_now is nonzero, we were interrupted by a signal, and
554
will print that later, so no need to show this too. */
555
fprintf(stderr, "getline() returned 0, retrying.\n");
556
}
557
}
558
559
free(buffer);
560
561
if(debug){
562
fprintf(stderr, "Restoring terminal attributes\n");
563
}
564
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
565
error_plus(0, errno, "tcsetattr+echo");
566
}
567
568
if(quit_now){
569
sigemptyset(&old_action.sa_mask);
570
old_action.sa_handler = SIG_DFL;
571
ret = sigaction(signal_received, &old_action, NULL);
572
if(ret == -1){
573
error_plus(0, errno, "sigaction");
574
}
575
raise(signal_received);
576
}
577
578
if(debug){
579
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
580
status);
581
}
582
if(status == EXIT_SUCCESS or status == EX_OK){
583
fputc('\n', stderr);
87
fputc('\n', stderr);
88
}
89
90
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
91
perror("tcsetattr+echo");
584
92
}
585
93
586
94
return status;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0