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- Committer: Teddy Hogeborn
- Date: 2009-01-15 05:27:55 UTC
- mfrom: (237.2.9 mandos-release)
- Revision ID: teddy@fukt.bsnet.se-20090115052755-luw0gjx8727p24o3
Merge from release branch.
- files removed:
- DBUS-API
- debian/source
- 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
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
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
#include <termios.h> /* struct termios, tcsetattr(),
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,
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()
45
*/
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 */
47
#include <string.h> /* strlen, rindex, strncmp, strcmp */
55
48
#include <argp.h> /* struct argp_option, struct
56
49
argp_state, struct argp,
57
50
argp_parse(), error_t,
58
51
ARGP_KEY_ARG, ARGP_KEY_END,
59
52
ARGP_ERR_UNKNOWN */
60
#include <sysexits.h> /* EX_SOFTWARE, EX_OSERR,
61
EX_UNAVAILABLE, EX_IOERR, EX_OK */
62
#include <fcntl.h> /* open() */
63
53
64
volatile sig_atomic_t quit_now = 0;
65
int signal_received;
54
volatile bool quit_now = false;
66
55
bool debug = false;
67
56
const char *argp_program_version = "password-prompt " VERSION;
68
57
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
69
58
70
/* Needed for conflict resolution */
71
const char plymouth_name[] = "plymouthd";
72
const char plymouth_alt_name[] = "plymouthd";
73
74
75
static void termination_handler(int signum){
76
if(quit_now){
77
return;
78
}
79
quit_now = 1;
80
signal_received = signum;
81
}
82
83
bool conflict_detection(void){
84
85
/* plymouth conflicts with password-prompt since both want to read
86
from the terminal. Password-prompt will exit if it detects
87
plymouth since plymouth performs the same functionality.
88
*/
89
int is_plymouth(const struct dirent *proc_entry){
90
int ret;
91
int cl_fd;
92
{
93
uintmax_t maxvalue;
94
char *tmp;
95
errno = 0;
96
maxvalue = strtoumax(proc_entry->d_name, &tmp, 10);
97
98
if(errno != 0 or *tmp != '\0'
99
or maxvalue != (uintmax_t)((pid_t)maxvalue)){
100
return 0;
101
}
102
}
103
104
char *cmdline_filename;
105
ret = asprintf(&cmdline_filename, "/proc/%s/cmdline",
106
proc_entry->d_name);
107
if(ret == -1){
108
error(0, errno, "asprintf");
109
return 0;
110
}
111
112
/* Open /proc/<pid>/cmdline */
113
cl_fd = open(cmdline_filename, O_RDONLY);
114
free(cmdline_filename);
115
if(cl_fd == -1){
116
error(0, errno, "open");
117
return 0;
118
}
119
120
char *cmdline = NULL;
121
{
122
size_t cmdline_len = 0;
123
size_t cmdline_allocated = 0;
124
char *tmp;
125
const size_t blocksize = 1024;
126
ssize_t sret;
127
do {
128
/* Allocate more space? */
129
if(cmdline_len + blocksize + 1 > cmdline_allocated){
130
tmp = realloc(cmdline, cmdline_allocated + blocksize + 1);
131
if(tmp == NULL){
132
error(0, errno, "realloc");
133
free(cmdline);
134
close(cl_fd);
135
return 0;
136
}
137
cmdline = tmp;
138
cmdline_allocated += blocksize;
139
}
140
141
/* Read data */
142
sret = read(cl_fd, cmdline + cmdline_len,
143
cmdline_allocated - cmdline_len);
144
if(sret == -1){
145
error(0, errno, "read");
146
free(cmdline);
147
close(cl_fd);
148
return 0;
149
}
150
cmdline_len += (size_t)sret;
151
} while(sret != 0);
152
ret = close(cl_fd);
153
if(ret == -1){
154
error(0, errno, "close");
155
free(cmdline);
156
return 0;
157
}
158
cmdline[cmdline_len] = '\0'; /* Make sure it is terminated */
159
}
160
/* we now have cmdline */
161
162
/* get basename */
163
char *cmdline_base = strrchr(cmdline, '/');
164
if(cmdline_base != NULL){
165
cmdline_base += 1; /* skip the slash */
166
} else {
167
cmdline_base = cmdline;
168
}
169
170
if((strcmp(cmdline_base, plymouth_name) != 0)
171
and (strcmp(cmdline_base, plymouth_alt_name) != 0)){
172
if(debug){
173
fprintf(stderr, "\"%s\" is not \"%s\" or \"%s\"\n",
174
cmdline_base, plymouth_name, plymouth_alt_name);
175
}
176
free(cmdline);
177
return 0;
178
}
179
fprintf(stderr, "\"%s\" equals \"%s\" or \"%s\"\n",
180
cmdline_base, plymouth_name, plymouth_alt_name);
181
free(cmdline);
182
return 1;
183
}
184
185
struct dirent **direntries;
186
int ret;
187
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
188
if (ret == -1){
189
error(1, errno, "scandir");
190
}
191
return ret > 0;
192
}
193
59
static void termination_handler(__attribute__((unused))int signum){
60
quit_now = true;
61
}
194
62
195
63
int main(int argc, char **argv){
196
ssize_t sret;
197
int ret;
64
ssize_t ret;
198
65
size_t n;
199
66
struct termios t_new, t_old;
200
67
char *buffer = NULL;
210
77
.doc = "Prefix shown before the prompt", .group = 2 },
211
78
{ .name = "debug", .key = 128,
212
79
.doc = "Debug mode", .group = 3 },
213
/*
214
* These reproduce what we would get without ARGP_NO_HELP
215
*/
216
{ .name = "help", .key = '?',
217
.doc = "Give this help list", .group = -1 },
218
{ .name = "usage", .key = -3,
219
.doc = "Give a short usage message", .group = -1 },
220
{ .name = "version", .key = 'V',
221
.doc = "Print program version", .group = -1 },
222
80
{ .name = NULL }
223
81
};
224
82
225
error_t parse_opt (int key, char *arg, struct argp_state *state){
226
errno = 0;
227
switch (key){
83
error_t parse_opt (int key, char *arg, struct argp_state *state) {
84
switch (key) {
228
85
case 'p':
229
86
prefix = arg;
230
87
break;
231
88
case 128:
232
89
debug = true;
233
90
break;
234
/*
235
* These reproduce what we would get without ARGP_NO_HELP
236
*/
237
case '?': /* --help */
238
argp_state_help(state, state->out_stream,
239
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
240
& ~(unsigned int)ARGP_HELP_EXIT_OK);
241
case -3: /* --usage */
242
argp_state_help(state, state->out_stream,
243
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
244
case 'V': /* --version */
245
fprintf(state->out_stream, "%s\n", argp_program_version);
246
exit(argp_err_exit_status);
91
case ARGP_KEY_ARG:
92
argp_usage(state);
93
break;
94
case ARGP_KEY_END:
247
95
break;
248
96
default:
249
97
return ARGP_ERR_UNKNOWN;
250
98
}
251
return errno;
99
return 0;
252
100
}
253
101
254
102
struct argp argp = { .options = options, .parser = parse_opt,
255
103
.args_doc = "",
256
104
.doc = "Mandos password-prompt -- Read and"
257
105
" output a password" };
258
ret = argp_parse(&argp, argc, argv,
259
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
260
switch(ret){
261
case 0:
262
break;
263
case ENOMEM:
264
default:
265
errno = ret;
266
error(0, errno, "argp_parse");
267
return EX_OSERR;
268
case EINVAL:
269
return EX_USAGE;
106
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
107
if(ret == ARGP_ERR_UNKNOWN){
108
fprintf(stderr, "Unknown error while parsing arguments\n");
109
return EXIT_FAILURE;
270
110
}
271
111
}
272
112
273
113
if(debug){
274
114
fprintf(stderr, "Starting %s\n", argv[0]);
275
115
}
276
277
if (conflict_detection()){
278
if(debug){
279
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
280
}
281
return EXIT_FAILURE;
282
}
283
284
116
if(debug){
285
117
fprintf(stderr, "Storing current terminal attributes\n");
286
118
}
287
119
288
120
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
289
int e = errno;
290
error(0, errno, "tcgetattr");
291
switch(e){
292
case EBADF:
293
case ENOTTY:
294
return EX_UNAVAILABLE;
295
default:
296
return EX_OSERR;
297
}
121
perror("tcgetattr");
122
return EXIT_FAILURE;
298
123
}
299
124
300
125
sigemptyset(&new_action.sa_mask);
301
ret = sigaddset(&new_action.sa_mask, SIGINT);
302
if(ret == -1){
303
error(0, errno, "sigaddset");
304
return EX_OSERR;
305
}
306
ret = sigaddset(&new_action.sa_mask, SIGHUP);
307
if(ret == -1){
308
error(0, errno, "sigaddset");
309
return EX_OSERR;
310
}
311
ret = sigaddset(&new_action.sa_mask, SIGTERM);
312
if(ret == -1){
313
error(0, errno, "sigaddset");
314
return EX_OSERR;
315
}
316
/* Need to check if the handler is SIG_IGN before handling:
317
| [[info:libc:Initial Signal Actions]] |
318
| [[info:libc:Basic Signal Handling]] |
319
*/
126
sigaddset(&new_action.sa_mask, SIGINT);
127
sigaddset(&new_action.sa_mask, SIGHUP);
128
sigaddset(&new_action.sa_mask, SIGTERM);
320
129
ret = sigaction(SIGINT, NULL, &old_action);
321
130
if(ret == -1){
322
error(0, errno, "sigaction");
323
return EX_OSERR;
131
perror("sigaction");
132
return EXIT_FAILURE;
324
133
}
325
134
if(old_action.sa_handler != SIG_IGN){
326
135
ret = sigaction(SIGINT, &new_action, NULL);
327
136
if(ret == -1){
328
error(0, errno, "sigaction");
329
return EX_OSERR;
137
perror("sigaction");
138
return EXIT_FAILURE;
330
139
}
331
140
}
332
141
ret = sigaction(SIGHUP, NULL, &old_action);
333
142
if(ret == -1){
334
error(0, errno, "sigaction");
335
return EX_OSERR;
143
perror("sigaction");
144
return EXIT_FAILURE;
336
145
}
337
146
if(old_action.sa_handler != SIG_IGN){
338
147
ret = sigaction(SIGHUP, &new_action, NULL);
339
148
if(ret == -1){
340
error(0, errno, "sigaction");
341
return EX_OSERR;
149
perror("sigaction");
150
return EXIT_FAILURE;
342
151
}
343
152
}
344
153
ret = sigaction(SIGTERM, NULL, &old_action);
345
154
if(ret == -1){
346
error(0, errno, "sigaction");
347
return EX_OSERR;
155
perror("sigaction");
156
return EXIT_FAILURE;
348
157
}
349
158
if(old_action.sa_handler != SIG_IGN){
350
159
ret = sigaction(SIGTERM, &new_action, NULL);
351
160
if(ret == -1){
352
error(0, errno, "sigaction");
353
return EX_OSERR;
161
perror("sigaction");
162
return EXIT_FAILURE;
354
163
}
355
164
}
356
165
360
169
}
361
170
362
171
t_new = t_old;
363
t_new.c_lflag &= ~(tcflag_t)ECHO;
172
t_new.c_lflag &= ~ECHO;
364
173
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
365
int e = errno;
366
error(0, errno, "tcsetattr-echo");
367
switch(e){
368
case EBADF:
369
case ENOTTY:
370
return EX_UNAVAILABLE;
371
case EINVAL:
372
default:
373
return EX_OSERR;
374
}
174
perror("tcsetattr-echo");
175
return EXIT_FAILURE;
375
176
}
376
177
377
178
if(debug){
378
179
fprintf(stderr, "Waiting for input from stdin \n");
379
180
}
390
191
fprintf(stderr, "%s ", prefix);
391
192
}
392
193
{
393
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
394
const char *crypttarget = getenv("CRYPTTAB_NAME");
395
/* Before cryptsetup 1.1.0~rc2 */
396
if(cryptsource == NULL){
397
cryptsource = getenv("cryptsource");
398
}
399
if(crypttarget == NULL){
400
crypttarget = getenv("crypttarget");
401
}
402
const char *const prompt1 = "Unlocking the disk";
403
const char *const prompt2 = "Enter passphrase";
194
const char *cryptsource = getenv("cryptsource");
195
const char *crypttarget = getenv("crypttarget");
196
const char *const prompt
197
= "Enter passphrase to unlock the disk";
404
198
if(cryptsource == NULL){
405
199
if(crypttarget == NULL){
406
fprintf(stderr, "%s to unlock the disk: ", prompt2);
200
fprintf(stderr, "%s: ", prompt);
407
201
} else {
408
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
409
prompt2);
202
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
410
203
}
411
204
} else {
412
205
if(crypttarget == NULL){
413
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
414
prompt2);
206
fprintf(stderr, "%s %s: ", prompt, cryptsource);
415
207
} else {
416
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
417
crypttarget, prompt2);
208
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
209
crypttarget);
418
210
}
419
211
}
420
212
}
421
sret = getline(&buffer, &n, stdin);
422
if(sret > 0){
213
ret = getline(&buffer, &n, stdin);
214
if(ret > 0){
423
215
status = EXIT_SUCCESS;
424
216
/* Make n = data size instead of allocated buffer size */
425
n = (size_t)sret;
217
n = (size_t)ret;
426
218
/* Strip final newline */
427
if(n > 0 and buffer[n-1] == '\n'){
219
if(n>0 and buffer[n-1] == '\n'){
428
220
buffer[n-1] = '\0'; /* not strictly necessary */
429
221
n--;
430
222
}
431
223
size_t written = 0;
432
224
while(written < n){
433
sret = write(STDOUT_FILENO, buffer + written, n - written);
434
if(sret < 0){
435
int e = errno;
436
error(0, errno, "write");
437
switch(e){
438
case EBADF:
439
case EFAULT:
440
case EINVAL:
441
case EFBIG:
442
case EIO:
443
case ENOSPC:
444
default:
445
status = EX_IOERR;
446
break;
447
case EINTR:
448
status = EXIT_FAILURE;
449
break;
450
}
451
break;
452
}
453
written += (size_t)sret;
454
}
455
sret = close(STDOUT_FILENO);
456
if(sret == -1){
457
int e = errno;
458
error(0, errno, "close");
459
switch(e){
460
case EBADF:
461
status = EX_OSFILE;
462
break;
463
case EIO:
464
default:
465
status = EX_IOERR;
466
break;
467
}
225
ret = write(STDOUT_FILENO, buffer + written, n - written);
226
if(ret < 0){
227
perror("write");
228
status = EXIT_FAILURE;
229
break;
230
}
231
written += (size_t)ret;
468
232
}
469
233
break;
470
234
}
471
if(sret < 0){
472
int e = errno;
235
if(ret < 0){
473
236
if(errno != EINTR and not feof(stdin)){
474
error(0, errno, "getline");
475
switch(e){
476
case EBADF:
477
status = EX_UNAVAILABLE;
478
case EIO:
479
case EINVAL:
480
default:
481
status = EX_IOERR;
482
break;
483
}
237
perror("getline");
238
status = EXIT_FAILURE;
484
239
break;
485
240
}
486
241
}
487
/* if(sret == 0), then the only sensible thing to do is to retry
488
to read from stdin */
242
/* if(ret == 0), then the only sensible thing to do is to retry to
243
read from stdin */
489
244
fputc('\n', stderr);
490
245
if(debug and not quit_now){
491
/* If quit_now is nonzero, we were interrupted by a signal, and
246
/* If quit_now is true, we were interrupted by a signal, and
492
247
will print that later, so no need to show this too. */
493
248
fprintf(stderr, "getline() returned 0, retrying.\n");
494
249
}
500
255
fprintf(stderr, "Restoring terminal attributes\n");
501
256
}
502
257
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
503
error(0, errno, "tcsetattr+echo");
504
}
505
506
if(quit_now){
507
sigemptyset(&old_action.sa_mask);
508
old_action.sa_handler = SIG_DFL;
509
ret = sigaction(signal_received, &old_action, NULL);
510
if(ret == -1){
511
error(0, errno, "sigaction");
512
}
513
raise(signal_received);
258
perror("tcsetattr+echo");
514
259
}
515
260
516
261
if(debug){
517
262
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
518
263
status);
519
264
}
520
if(status == EXIT_SUCCESS or status == EX_OK){
265
if(status == EXIT_SUCCESS){
521
266
fputc('\n', stderr);
522
267
}
523
268
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