(root)/mandos/release
» Revision
237.2.151
(compared to revision 237.7.35)
: plugins.d/password-prompt.c
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- Committer: Teddy Hogeborn
- Date: 2009-10-03 13:04:42 UTC
- mto: (24.1.146 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: teddy@fukt.bsnet.se-20091003130442-yd715ir0lbiac1fr
* mandos (daemon): Use "os.path.devnull" in the error message.
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/password-prompt.c
2
2
/*
3
3
* Password-prompt - 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 © 2008,2009 Teddy Hogeborn
6
* Copyright © 2008,2009 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
22
22
* Contact the authors at <mandos@fukt.bsnet.se>.
23
23
*/
24
24
25
#define _GNU_SOURCE /* getline(), asprintf() */
25
#define _GNU_SOURCE /* getline() */
26
26
27
#include <termios.h> /* struct termios, tcsetattr(),
27
#include <termios.h> /* struct termios, tcsetattr(),
28
28
TCSAFLUSH, tcgetattr(), ECHO */
29
29
#include <unistd.h> /* struct termios, tcsetattr(),
30
30
STDIN_FILENO, TCSAFLUSH,
31
tcgetattr(), ECHO, readlink() */
31
tcgetattr(), ECHO */
32
32
#include <signal.h> /* sig_atomic_t, raise(), struct
33
33
sigaction, sigemptyset(),
34
34
sigaction(), sigaddset(), SIGINT,
35
35
SIGQUIT, SIGHUP, SIGTERM,
36
36
raise() */
37
37
#include <stddef.h> /* NULL, size_t, ssize_t */
38
#include <sys/types.h> /* ssize_t, struct dirent, pid_t,
39
ssize_t, open() */
38
#include <sys/types.h> /* ssize_t */
40
39
#include <stdlib.h> /* EXIT_SUCCESS, EXIT_FAILURE,
41
getenv(), free() */
42
#include <dirent.h> /* scandir(), alphasort() */
40
getopt_long, getenv() */
43
41
#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() */
42
stdin, feof(), perror(), fputc(),
43
stdout, getopt_long */
44
#include <errno.h> /* errno, EINVAL */
50
45
#include <iso646.h> /* or, not */
51
46
#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
*/
47
#include <string.h> /* strlen, rindex, strncmp, strcmp */
56
48
#include <argp.h> /* struct argp_option, struct
57
49
argp_state, struct argp,
58
50
argp_parse(), error_t,
59
51
ARGP_KEY_ARG, ARGP_KEY_END,
60
52
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
53
66
54
volatile sig_atomic_t quit_now = 0;
67
55
int signal_received;
69
57
const char *argp_program_version = "password-prompt " VERSION;
70
58
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
71
59
72
/* Needed for conflict resolution */
73
const char plymouth_name[] = "plymouthd";
74
75
/* Function to use when printing errors */
76
void error_plus(int status, int errnum, const char *formatstring,
77
...){
78
va_list ap;
79
char *text;
80
int ret;
81
82
va_start(ap, formatstring);
83
ret = vasprintf(&text, formatstring, ap);
84
if (ret == -1){
85
fprintf(stderr, "Mandos plugin %s: ",
86
program_invocation_short_name);
87
vfprintf(stderr, formatstring, ap);
88
fprintf(stderr, ": ");
89
fprintf(stderr, "%s\n", strerror(errnum));
90
error(status, errno, "vasprintf while printing error");
91
return;
92
}
93
fprintf(stderr, "Mandos plugin ");
94
error(status, errnum, "%s", text);
95
free(text);
96
}
97
98
60
static void termination_handler(int signum){
99
61
if(quit_now){
100
62
return;
103
65
signal_received = signum;
104
66
}
105
67
106
bool conflict_detection(void){
107
108
/* plymouth conflicts with password-prompt since both want to read
109
from the terminal. Password-prompt will exit if it detects
110
plymouth since plymouth performs the same functionality.
111
*/
112
int is_plymouth(const struct dirent *proc_entry){
113
int ret;
114
int cl_fd;
115
{
116
uintmax_t maxvalue;
117
char *tmp;
118
errno = 0;
119
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
120
121
if(errno != 0 or *tmp != '\0'
122
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
123
return 0;
124
}
125
}
126
127
char *cmdline_filename;
128
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
129
proc_entry->d_name);
130
if(ret == -1){
131
error(0, errno, "asprintf");
132
return 0;
133
}
134
135
/* Open /proc/<pid>/cmdline */
136
cl_fd = open(cmdline_filename, O_RDONLY);
137
free(cmdline_filename);
138
if(cl_fd == -1){
139
if(errno != ENOENT){
140
error(0, errno, "open");
141
}
142
return 0;
143
}
144
145
char *cmdline = NULL;
146
{
147
size_t cmdline_len = 0;
148
size_t cmdline_allocated = 0;
149
char *tmp;
150
const size_t blocksize = 1024;
151
ssize_t sret;
152
do {
153
/* Allocate more space? */
154
if(cmdline_len + blocksize + 1 > cmdline_allocated){
155
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
156
if(tmp == NULL){
157
error(0, errno, "realloc");
158
free(cmdline);
159
close(cl_fd);
160
return 0;
161
}
162
cmdline = tmp;
163
cmdline_allocated += blocksize;
164
}
165
166
/* Read data */
167
sret = read(cl_fd, cmdline + cmdline_len,
168
cmdline_allocated - cmdline_len);
169
if(sret == -1){
170
error(0, errno, "read");
171
free(cmdline);
172
close(cl_fd);
173
return 0;
174
}
175
cmdline_len += (size_t)sret;
176
} while(sret != 0);
177
ret = close(cl_fd);
178
if(ret == -1){
179
error(0, errno, "close");
180
free(cmdline);
181
return 0;
182
}
183
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
184
}
185
/* we now have cmdline */
186
187
/* get basename */
188
char *cmdline_base = strrchr(cmdline, '/');
189
if(cmdline_base != NULL){
190
cmdline_base += 1; /* skip the slash */
191
} else {
192
cmdline_base = cmdline;
193
}
194
195
if(strcmp(cmdline_base, plymouth_name) != 0){
196
if(debug){
197
fprintf(stderr, "\"%s\" is not \"%s\"\n", cmdline_base,
198
plymouth_name);
199
}
200
free(cmdline);
201
return 0;
202
}
203
if(debug){
204
fprintf(stderr, "\"%s\" equals \"%s\"\n", cmdline_base,
205
plymouth_name);
206
}
207
free(cmdline);
208
return 1;
209
}
210
211
struct dirent **direntries;
212
int ret;
213
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
214
if (ret == -1){
215
error(1, errno, "scandir");
216
}
217
return ret > 0;
218
}
219
220
221
68
int main(int argc, char **argv){
222
ssize_t sret;
223
int ret;
69
ssize_t ret;
224
70
size_t n;
225
71
struct termios t_new, t_old;
226
72
char *buffer = NULL;
236
82
.doc = "Prefix shown before the prompt", .group = 2 },
237
83
{ .name = "debug", .key = 128,
238
84
.doc = "Debug mode", .group = 3 },
239
/*
240
* These reproduce what we would get without ARGP_NO_HELP
241
*/
242
{ .name = "help", .key = '?',
243
.doc = "Give this help list", .group = -1 },
244
{ .name = "usage", .key = -3,
245
.doc = "Give a short usage message", .group = -1 },
246
{ .name = "version", .key = 'V',
247
.doc = "Print program version", .group = -1 },
248
85
{ .name = NULL }
249
86
};
250
87
251
88
error_t parse_opt (int key, char *arg, struct argp_state *state){
252
errno = 0;
253
89
switch (key){
254
90
case 'p':
255
91
prefix = arg;
257
93
case 128:
258
94
debug = true;
259
95
break;
260
/*
261
* These reproduce what we would get without ARGP_NO_HELP
262
*/
263
case '?': /* --help */
264
argp_state_help(state, state->out_stream,
265
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
266
& ~(unsigned int)ARGP_HELP_EXIT_OK);
267
case -3: /* --usage */
268
argp_state_help(state, state->out_stream,
269
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
270
case 'V': /* --version */
271
fprintf(state->out_stream, "%s\n", argp_program_version);
272
exit(argp_err_exit_status);
96
case ARGP_KEY_ARG:
97
argp_usage(state);
98
break;
99
case ARGP_KEY_END:
273
100
break;
274
101
default:
275
102
return ARGP_ERR_UNKNOWN;
276
103
}
277
return errno;
104
return 0;
278
105
}
279
106
280
107
struct argp argp = { .options = options, .parser = parse_opt,
281
108
.args_doc = "",
282
109
.doc = "Mandos password-prompt -- Read and"
283
110
" output a password" };
284
ret = argp_parse(&argp, argc, argv,
285
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
286
switch(ret){
287
case 0:
288
break;
289
case ENOMEM:
290
default:
291
errno = ret;
292
error(0, errno, "argp_parse");
293
return EX_OSERR;
294
case EINVAL:
295
return EX_USAGE;
111
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
112
if(ret == ARGP_ERR_UNKNOWN){
113
fprintf(stderr, "Unknown error while parsing arguments\n");
114
return EXIT_FAILURE;
296
115
}
297
116
}
298
117
299
118
if(debug){
300
119
fprintf(stderr, "Starting %s\n", argv[0]);
301
120
}
302
303
if (conflict_detection()){
304
if(debug){
305
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
306
}
307
return EXIT_FAILURE;
308
}
309
310
121
if(debug){
311
122
fprintf(stderr, "Storing current terminal attributes\n");
312
123
}
313
124
314
125
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
315
int e = errno;
316
error(0, errno, "tcgetattr");
317
switch(e){
318
case EBADF:
319
case ENOTTY:
320
return EX_UNAVAILABLE;
321
default:
322
return EX_OSERR;
323
}
126
perror("tcgetattr");
127
return EXIT_FAILURE;
324
128
}
325
129
326
130
sigemptyset(&new_action.sa_mask);
327
131
ret = sigaddset(&new_action.sa_mask, SIGINT);
328
132
if(ret == -1){
329
error(0, errno, "sigaddset");
330
return EX_OSERR;
133
perror("sigaddset");
134
return EXIT_FAILURE;
331
135
}
332
136
ret = sigaddset(&new_action.sa_mask, SIGHUP);
333
137
if(ret == -1){
334
error(0, errno, "sigaddset");
335
return EX_OSERR;
138
perror("sigaddset");
139
return EXIT_FAILURE;
336
140
}
337
141
ret = sigaddset(&new_action.sa_mask, SIGTERM);
338
142
if(ret == -1){
339
error(0, errno, "sigaddset");
340
return EX_OSERR;
143
perror("sigaddset");
144
return EXIT_FAILURE;
341
145
}
342
146
/* Need to check if the handler is SIG_IGN before handling:
343
147
| [[info:libc:Initial Signal Actions]] |
345
149
*/
346
150
ret = sigaction(SIGINT, NULL, &old_action);
347
151
if(ret == -1){
348
error(0, errno, "sigaction");
349
return EX_OSERR;
152
perror("sigaction");
153
return EXIT_FAILURE;
350
154
}
351
155
if(old_action.sa_handler != SIG_IGN){
352
156
ret = sigaction(SIGINT, &new_action, NULL);
353
157
if(ret == -1){
354
error(0, errno, "sigaction");
355
return EX_OSERR;
158
perror("sigaction");
159
return EXIT_FAILURE;
356
160
}
357
161
}
358
162
ret = sigaction(SIGHUP, NULL, &old_action);
359
163
if(ret == -1){
360
error(0, errno, "sigaction");
361
return EX_OSERR;
164
perror("sigaction");
165
return EXIT_FAILURE;
362
166
}
363
167
if(old_action.sa_handler != SIG_IGN){
364
168
ret = sigaction(SIGHUP, &new_action, NULL);
365
169
if(ret == -1){
366
error(0, errno, "sigaction");
367
return EX_OSERR;
170
perror("sigaction");
171
return EXIT_FAILURE;
368
172
}
369
173
}
370
174
ret = sigaction(SIGTERM, NULL, &old_action);
371
175
if(ret == -1){
372
error(0, errno, "sigaction");
373
return EX_OSERR;
176
perror("sigaction");
177
return EXIT_FAILURE;
374
178
}
375
179
if(old_action.sa_handler != SIG_IGN){
376
180
ret = sigaction(SIGTERM, &new_action, NULL);
377
181
if(ret == -1){
378
error(0, errno, "sigaction");
379
return EX_OSERR;
182
perror("sigaction");
183
return EXIT_FAILURE;
380
184
}
381
185
}
382
186
388
192
t_new = t_old;
389
193
t_new.c_lflag &= ~(tcflag_t)ECHO;
390
194
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
391
int e = errno;
392
error(0, errno, "tcsetattr-echo");
393
switch(e){
394
case EBADF:
395
case ENOTTY:
396
return EX_UNAVAILABLE;
397
case EINVAL:
398
default:
399
return EX_OSERR;
400
}
195
perror("tcsetattr-echo");
196
return EXIT_FAILURE;
401
197
}
402
198
403
199
if(debug){
404
200
fprintf(stderr, "Waiting for input from stdin \n");
405
201
}
416
212
fprintf(stderr, "%s ", prefix);
417
213
}
418
214
{
419
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
420
const char *crypttarget = getenv("CRYPTTAB_NAME");
421
/* Before cryptsetup 1.1.0~rc2 */
422
if(cryptsource == NULL){
423
cryptsource = getenv("cryptsource");
424
}
425
if(crypttarget == NULL){
426
crypttarget = getenv("crypttarget");
427
}
428
const char *const prompt1 = "Unlocking the disk";
429
const char *const prompt2 = "Enter passphrase";
215
const char *cryptsource = getenv("cryptsource");
216
const char *crypttarget = getenv("crypttarget");
217
const char *const prompt
218
= "Enter passphrase to unlock the disk";
430
219
if(cryptsource == NULL){
431
220
if(crypttarget == NULL){
432
fprintf(stderr, "%s to unlock the disk: ", prompt2);
221
fprintf(stderr, "%s: ", prompt);
433
222
} else {
434
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
435
prompt2);
223
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
436
224
}
437
225
} else {
438
226
if(crypttarget == NULL){
439
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
440
prompt2);
227
fprintf(stderr, "%s %s: ", prompt, cryptsource);
441
228
} else {
442
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
443
crypttarget, prompt2);
229
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
230
crypttarget);
444
231
}
445
232
}
446
233
}
447
sret = getline(&buffer, &n, stdin);
448
if(sret > 0){
234
ret = getline(&buffer, &n, stdin);
235
if(ret > 0){
449
236
status = EXIT_SUCCESS;
450
237
/* Make n = data size instead of allocated buffer size */
451
n = (size_t)sret;
238
n = (size_t)ret;
452
239
/* Strip final newline */
453
if(n > 0 and buffer[n-1] == '\n'){
240
if(n>0 and buffer[n-1] == '\n'){
454
241
buffer[n-1] = '\0'; /* not strictly necessary */
455
242
n--;
456
243
}
457
244
size_t written = 0;
458
245
while(written < n){
459
sret = write(STDOUT_FILENO, buffer + written, n - written);
460
if(sret < 0){
461
int e = errno;
462
error(0, errno, "write");
463
switch(e){
464
case EBADF:
465
case EFAULT:
466
case EINVAL:
467
case EFBIG:
468
case EIO:
469
case ENOSPC:
470
default:
471
status = EX_IOERR;
472
break;
473
case EINTR:
474
status = EXIT_FAILURE;
475
break;
476
}
477
break;
478
}
479
written += (size_t)sret;
480
}
481
sret = close(STDOUT_FILENO);
482
if(sret == -1){
483
int e = errno;
484
error(0, errno, "close");
485
switch(e){
486
case EBADF:
487
status = EX_OSFILE;
488
break;
489
case EIO:
490
default:
491
status = EX_IOERR;
492
break;
493
}
246
ret = write(STDOUT_FILENO, buffer + written, n - written);
247
if(ret < 0){
248
perror("write");
249
status = EXIT_FAILURE;
250
break;
251
}
252
written += (size_t)ret;
494
253
}
495
254
break;
496
255
}
497
if(sret < 0){
498
int e = errno;
256
if(ret < 0){
499
257
if(errno != EINTR and not feof(stdin)){
500
error(0, errno, "getline");
501
switch(e){
502
case EBADF:
503
status = EX_UNAVAILABLE;
504
case EIO:
505
case EINVAL:
506
default:
507
status = EX_IOERR;
508
break;
509
}
258
perror("getline");
259
status = EXIT_FAILURE;
510
260
break;
511
261
}
512
262
}
513
/* if(sret == 0), then the only sensible thing to do is to retry
514
to read from stdin */
263
/* if(ret == 0), then the only sensible thing to do is to retry to
264
read from stdin */
515
265
fputc('\n', stderr);
516
266
if(debug and not quit_now){
517
267
/* If quit_now is nonzero, we were interrupted by a signal, and
526
276
fprintf(stderr, "Restoring terminal attributes\n");
527
277
}
528
278
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
529
error(0, errno, "tcsetattr+echo");
279
perror("tcsetattr+echo");
530
280
}
531
281
532
282
if(quit_now){
534
284
old_action.sa_handler = SIG_DFL;
535
285
ret = sigaction(signal_received, &old_action, NULL);
536
286
if(ret == -1){
537
error(0, errno, "sigaction");
287
perror("sigaction");
538
288
}
539
289
raise(signal_received);
540
290
}
543
293
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
544
294
status);
545
295
}
546
if(status == EXIT_SUCCESS or status == EX_OK){
296
if(status == EXIT_SUCCESS){
547
297
fputc('\n', stderr);
548
298
}
549
299
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