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» Revision
24.1.117
(compared to revision 463.1.10)
: plugins.d/password-prompt.c
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- Committer: Björn Påhlsson
- Date: 2008-12-29 13:49:46 UTC
- mfrom: (243 mandos)
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@braxen-20081229134946-hp3dsgdz92vb8312
merge
- files added:
- debian/mandos-client.config
- files removed:
- DBUS-API
- debian/source
- files renamed:
- mandos-ctl => mandos-list
- files modified:
- .bzrignore
added
removed
plugins.d/password-prompt.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
3
* Passprompt - Read a password from the terminal and print it
4
4
*
5
* Copyright © 2008-2010 Teddy Hogeborn
6
* Copyright © 2008-2010 Björn Påhlsson
5
* Copyright © 2008 Teddy Hogeborn
6
* Copyright © 2008 Björn Påhlsson
7
7
*
8
8
* This program is free software: you can redistribute it and/or
9
9
* modify it under the terms of the GNU General Public License as
19
19
* along with this program. If not, see
20
20
* <http://www.gnu.org/licenses/>.
21
21
*
22
* Contact the authors at <mandos@fukt.bsnet.se>.
22
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
23
* <https://www.fukt.bsnet.se/~teddy/>.
23
24
*/
24
25
25
#define _GNU_SOURCE /* getline(), asprintf() */
26
#define _GNU_SOURCE /* getline() */
26
27
27
28
#include <termios.h> /* struct termios, tcsetattr(),
28
29
TCSAFLUSH, tcgetattr(), ECHO */
29
30
#include <unistd.h> /* struct termios, tcsetattr(),
30
31
STDIN_FILENO, TCSAFLUSH,
31
tcgetattr(), ECHO, readlink() */
32
tcgetattr(), ECHO */
32
33
#include <signal.h> /* sig_atomic_t, raise(), struct
33
34
sigaction, sigemptyset(),
34
35
sigaction(), sigaddset(), SIGINT,
35
SIGQUIT, SIGHUP, SIGTERM,
36
raise() */
36
SIGQUIT, SIGHUP, SIGTERM */
37
37
#include <stddef.h> /* NULL, size_t, ssize_t */
38
#include <sys/types.h> /* ssize_t, struct dirent, pid_t, ssize_t */
38
#include <sys/types.h> /* ssize_t */
39
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
40
getenv(), free() */
41
#include <dirent.h> /* scandir(), alphasort() */
40
getopt_long, getenv() */
42
41
#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() */
42
stdin, feof(), perror(), fputc(),
43
stdout, getopt_long */
44
#include <errno.h> /* errno, EINVAL */
49
45
#include <iso646.h> /* or, not */
50
46
#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 */
47
#include <string.h> /* strlen, rindex, strncmp, strcmp */
54
48
#include <argp.h> /* struct argp_option, struct
55
49
argp_state, struct argp,
56
50
argp_parse(), error_t,
57
51
ARGP_KEY_ARG, ARGP_KEY_END,
58
52
ARGP_ERR_UNKNOWN */
59
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
60
EX_UNAVAILABLE, EX_IOERR, EX_OK */
61
53
62
volatile sig_atomic_t quit_now = 0;
63
int signal_received;
54
volatile bool quit_now = false;
64
55
bool debug = false;
65
56
const char *argp_program_version = "password-prompt " VERSION;
66
57
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
67
58
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
59
static void termination_handler(__attribute__((unused))int signum){
60
quit_now = true;
61
}
147
62
148
63
int main(int argc, char **argv){
149
ssize_t sret;
150
int ret;
64
ssize_t ret;
151
65
size_t n;
152
66
struct termios t_new, t_old;
153
67
char *buffer = NULL;
163
77
.doc = "Prefix shown before the prompt", .group = 2 },
164
78
{ .name = "debug", .key = 128,
165
79
.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
80
{ .name = NULL }
176
81
};
177
178
error_t parse_opt (int key, char *arg, struct argp_state *state){
179
errno = 0;
180
switch (key){
82
83
error_t parse_opt (int key, char *arg, struct argp_state *state) {
84
/* Get the INPUT argument from `argp_parse', which we know is a
85
pointer to our plugin list pointer. */
86
switch (key) {
181
87
case 'p':
182
88
prefix = arg;
183
89
break;
184
90
case 128:
185
91
debug = true;
186
92
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);
93
case ARGP_KEY_ARG:
94
argp_usage (state);
95
break;
96
case ARGP_KEY_END:
200
97
break;
201
98
default:
202
99
return ARGP_ERR_UNKNOWN;
203
100
}
204
return errno;
101
return 0;
205
102
}
206
103
207
104
struct argp argp = { .options = options, .parser = parse_opt,
208
105
.args_doc = "",
209
106
.doc = "Mandos password-prompt -- Read and"
210
107
" 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;
108
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
109
if (ret == ARGP_ERR_UNKNOWN){
110
fprintf(stderr, "Unknown error while parsing arguments\n");
111
return EXIT_FAILURE;
223
112
}
224
113
}
225
226
if(debug){
114
115
if (debug){
227
116
fprintf(stderr, "Starting %s\n", argv[0]);
228
117
}
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){
118
if (debug){
238
119
fprintf(stderr, "Storing current terminal attributes\n");
239
120
}
240
121
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
}
122
if (tcgetattr(STDIN_FILENO, &t_old) != 0){
123
perror("tcgetattr");
124
return EXIT_FAILURE;
251
125
}
252
126
253
127
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
*/
128
sigaddset(&new_action.sa_mask, SIGINT);
129
sigaddset(&new_action.sa_mask, SIGHUP);
130
sigaddset(&new_action.sa_mask, SIGTERM);
273
131
ret = sigaction(SIGINT, NULL, &old_action);
274
132
if(ret == -1){
275
error(0, errno, "sigaction");
276
return EX_OSERR;
133
perror("sigaction");
134
return EXIT_FAILURE;
277
135
}
278
if(old_action.sa_handler != SIG_IGN){
136
if (old_action.sa_handler != SIG_IGN){
279
137
ret = sigaction(SIGINT, &new_action, NULL);
280
138
if(ret == -1){
281
error(0, errno, "sigaction");
282
return EX_OSERR;
139
perror("sigaction");
140
return EXIT_FAILURE;
283
141
}
284
142
}
285
143
ret = sigaction(SIGHUP, NULL, &old_action);
286
144
if(ret == -1){
287
error(0, errno, "sigaction");
288
return EX_OSERR;
145
perror("sigaction");
146
return EXIT_FAILURE;
289
147
}
290
if(old_action.sa_handler != SIG_IGN){
148
if (old_action.sa_handler != SIG_IGN){
291
149
ret = sigaction(SIGHUP, &new_action, NULL);
292
150
if(ret == -1){
293
error(0, errno, "sigaction");
294
return EX_OSERR;
151
perror("sigaction");
152
return EXIT_FAILURE;
295
153
}
296
154
}
297
155
ret = sigaction(SIGTERM, NULL, &old_action);
298
156
if(ret == -1){
299
error(0, errno, "sigaction");
300
return EX_OSERR;
157
perror("sigaction");
158
return EXIT_FAILURE;
301
159
}
302
if(old_action.sa_handler != SIG_IGN){
160
if (old_action.sa_handler != SIG_IGN){
303
161
ret = sigaction(SIGTERM, &new_action, NULL);
304
162
if(ret == -1){
305
error(0, errno, "sigaction");
306
return EX_OSERR;
163
perror("sigaction");
164
return EXIT_FAILURE;
307
165
}
308
166
}
309
167
310
168
311
if(debug){
169
if (debug){
312
170
fprintf(stderr, "Removing echo flag from terminal attributes\n");
313
171
}
314
172
315
173
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
}
174
t_new.c_lflag &= ~ECHO;
175
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
176
perror("tcsetattr-echo");
177
return EXIT_FAILURE;
328
178
}
329
330
if(debug){
179
180
if (debug){
331
181
fprintf(stderr, "Waiting for input from stdin \n");
332
182
}
333
183
while(true){
334
if(quit_now){
184
if (quit_now){
335
185
if(debug){
336
186
fprintf(stderr, "Interrupted by signal, exiting.\n");
337
187
}
343
193
fprintf(stderr, "%s ", prefix);
344
194
}
345
195
{
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";
196
const char *cryptsource = getenv("cryptsource");
197
const char *crypttarget = getenv("crypttarget");
198
const char *const prompt
199
= "Enter passphrase to unlock the disk";
357
200
if(cryptsource == NULL){
358
201
if(crypttarget == NULL){
359
fprintf(stderr, "%s to unlock the disk: ", prompt2);
202
fprintf(stderr, "%s: ", prompt);
360
203
} else {
361
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
362
prompt2);
204
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
363
205
}
364
206
} else {
365
207
if(crypttarget == NULL){
366
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
367
prompt2);
208
fprintf(stderr, "%s %s: ", prompt, cryptsource);
368
209
} else {
369
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
370
crypttarget, prompt2);
210
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
211
crypttarget);
371
212
}
372
213
}
373
214
}
374
sret = getline(&buffer, &n, stdin);
375
if(sret > 0){
215
ret = getline(&buffer, &n, stdin);
216
if (ret > 0){
376
217
status = EXIT_SUCCESS;
377
218
/* Make n = data size instead of allocated buffer size */
378
n = (size_t)sret;
219
n = (size_t)ret;
379
220
/* Strip final newline */
380
if(n > 0 and buffer[n-1] == '\n'){
221
if(n>0 and buffer[n-1] == '\n'){
381
222
buffer[n-1] = '\0'; /* not strictly necessary */
382
223
n--;
383
224
}
384
225
size_t written = 0;
385
226
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
}
227
ret = write(STDOUT_FILENO, buffer + written, n - written);
228
if(ret < 0){
229
perror("write");
230
status = EXIT_FAILURE;
231
break;
232
}
233
written += (size_t)ret;
421
234
}
422
235
break;
423
236
}
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
}
237
if (ret < 0){
238
if (errno != EINTR and not feof(stdin)){
239
perror("getline");
240
status = EXIT_FAILURE;
437
241
break;
438
242
}
439
243
}
440
/* if(sret == 0), then the only sensible thing to do is to retry to
244
/* if(ret == 0), then the only sensible thing to do is to retry to
441
245
read from stdin */
442
246
fputc('\n', stderr);
443
247
if(debug and not quit_now){
444
/* If quit_now is nonzero, we were interrupted by a signal, and
248
/* If quit_now is true, we were interrupted by a signal, and
445
249
will print that later, so no need to show this too. */
446
250
fprintf(stderr, "getline() returned 0, retrying.\n");
447
251
}
448
252
}
449
253
450
254
free(buffer);
451
255
452
if(debug){
256
if (debug){
453
257
fprintf(stderr, "Restoring terminal attributes\n");
454
258
}
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){
259
if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
260
perror("tcsetattr+echo");
261
}
262
263
if (debug){
470
264
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
471
265
status);
472
266
}
473
if(status == EXIT_SUCCESS or status == EX_OK){
267
if(status == EXIT_SUCCESS){
474
268
fputc('\n', stderr);
475
269
}
476
270
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