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» Revision
24.1.141
(compared to revision 24.1.185)
: plugins.d/password-prompt.c
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- Committer: Björn Påhlsson
- Date: 2009-09-21 13:13:47 UTC
- mfrom: (237.2.127 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 270.
- Revision ID: belorn@braxen-20090921131347-mhuf1qnwavhyd6l1
fixed incorrect include comments
- 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 */
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 = NULL;
212
int ret;
213
ret = scandir("/proc", &direntries, is_plymouth, alphasort);
214
if (ret == -1){
215
error(1, errno, "scandir");
216
}
217
free(direntries);
218
return ret > 0;
219
}
220
221
222
68
int main(int argc, char **argv){
223
ssize_t sret;
224
int ret;
69
ssize_t ret;
225
70
size_t n;
226
71
struct termios t_new, t_old;
227
72
char *buffer = NULL;
237
82
.doc = "Prefix shown before the prompt", .group = 2 },
238
83
{ .name = "debug", .key = 128,
239
84
.doc = "Debug mode", .group = 3 },
240
/*
241
* These reproduce what we would get without ARGP_NO_HELP
242
*/
243
{ .name = "help", .key = '?',
244
.doc = "Give this help list", .group = -1 },
245
{ .name = "usage", .key = -3,
246
.doc = "Give a short usage message", .group = -1 },
247
{ .name = "version", .key = 'V',
248
.doc = "Print program version", .group = -1 },
249
85
{ .name = NULL }
250
86
};
251
87
252
88
error_t parse_opt (int key, char *arg, struct argp_state *state){
253
errno = 0;
254
89
switch (key){
255
90
case 'p':
256
91
prefix = arg;
258
93
case 128:
259
94
debug = true;
260
95
break;
261
/*
262
* These reproduce what we would get without ARGP_NO_HELP
263
*/
264
case '?': /* --help */
265
argp_state_help(state, state->out_stream,
266
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
267
& ~(unsigned int)ARGP_HELP_EXIT_OK);
268
case -3: /* --usage */
269
argp_state_help(state, state->out_stream,
270
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
271
case 'V': /* --version */
272
fprintf(state->out_stream, "%s\n", argp_program_version);
273
exit(argp_err_exit_status);
96
case ARGP_KEY_ARG:
97
argp_usage(state);
98
break;
99
case ARGP_KEY_END:
274
100
break;
275
101
default:
276
102
return ARGP_ERR_UNKNOWN;
277
103
}
278
return errno;
104
return 0;
279
105
}
280
106
281
107
struct argp argp = { .options = options, .parser = parse_opt,
282
108
.args_doc = "",
283
109
.doc = "Mandos password-prompt -- Read and"
284
110
" output a password" };
285
ret = argp_parse(&argp, argc, argv,
286
ARGP_IN_ORDER | ARGP_NO_HELP, NULL, NULL);
287
switch(ret){
288
case 0:
289
break;
290
case ENOMEM:
291
default:
292
errno = ret;
293
error(0, errno, "argp_parse");
294
return EX_OSERR;
295
case EINVAL:
296
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;
297
115
}
298
116
}
299
117
300
118
if(debug){
301
119
fprintf(stderr, "Starting %s\n", argv[0]);
302
120
}
303
304
if (conflict_detection()){
305
if(debug){
306
fprintf(stderr, "Stopping %s because of conflict\n", argv[0]);
307
}
308
return EXIT_FAILURE;
309
}
310
311
121
if(debug){
312
122
fprintf(stderr, "Storing current terminal attributes\n");
313
123
}
314
124
315
125
if(tcgetattr(STDIN_FILENO, &t_old) != 0){
316
int e = errno;
317
error(0, errno, "tcgetattr");
318
switch(e){
319
case EBADF:
320
case ENOTTY:
321
return EX_UNAVAILABLE;
322
default:
323
return EX_OSERR;
324
}
126
perror("tcgetattr");
127
return EXIT_FAILURE;
325
128
}
326
129
327
130
sigemptyset(&new_action.sa_mask);
328
131
ret = sigaddset(&new_action.sa_mask, SIGINT);
329
132
if(ret == -1){
330
error(0, errno, "sigaddset");
331
return EX_OSERR;
133
perror("sigaddset");
134
return EXIT_FAILURE;
332
135
}
333
136
ret = sigaddset(&new_action.sa_mask, SIGHUP);
334
137
if(ret == -1){
335
error(0, errno, "sigaddset");
336
return EX_OSERR;
138
perror("sigaddset");
139
return EXIT_FAILURE;
337
140
}
338
141
ret = sigaddset(&new_action.sa_mask, SIGTERM);
339
142
if(ret == -1){
340
error(0, errno, "sigaddset");
341
return EX_OSERR;
143
perror("sigaddset");
144
return EXIT_FAILURE;
342
145
}
343
146
/* Need to check if the handler is SIG_IGN before handling:
344
147
| [[info:libc:Initial Signal Actions]] |
346
149
*/
347
150
ret = sigaction(SIGINT, NULL, &old_action);
348
151
if(ret == -1){
349
error(0, errno, "sigaction");
350
return EX_OSERR;
152
perror("sigaction");
153
return EXIT_FAILURE;
351
154
}
352
155
if(old_action.sa_handler != SIG_IGN){
353
156
ret = sigaction(SIGINT, &new_action, NULL);
354
157
if(ret == -1){
355
error(0, errno, "sigaction");
356
return EX_OSERR;
158
perror("sigaction");
159
return EXIT_FAILURE;
357
160
}
358
161
}
359
162
ret = sigaction(SIGHUP, NULL, &old_action);
360
163
if(ret == -1){
361
error(0, errno, "sigaction");
362
return EX_OSERR;
164
perror("sigaction");
165
return EXIT_FAILURE;
363
166
}
364
167
if(old_action.sa_handler != SIG_IGN){
365
168
ret = sigaction(SIGHUP, &new_action, NULL);
366
169
if(ret == -1){
367
error(0, errno, "sigaction");
368
return EX_OSERR;
170
perror("sigaction");
171
return EXIT_FAILURE;
369
172
}
370
173
}
371
174
ret = sigaction(SIGTERM, NULL, &old_action);
372
175
if(ret == -1){
373
error(0, errno, "sigaction");
374
return EX_OSERR;
176
perror("sigaction");
177
return EXIT_FAILURE;
375
178
}
376
179
if(old_action.sa_handler != SIG_IGN){
377
180
ret = sigaction(SIGTERM, &new_action, NULL);
378
181
if(ret == -1){
379
error(0, errno, "sigaction");
380
return EX_OSERR;
182
perror("sigaction");
183
return EXIT_FAILURE;
381
184
}
382
185
}
383
186
387
190
}
388
191
389
192
t_new = t_old;
390
t_new.c_lflag &= ~(tcflag_t)ECHO;
193
t_new.c_lflag &= ~ECHO;
391
194
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_new) != 0){
392
int e = errno;
393
error(0, errno, "tcsetattr-echo");
394
switch(e){
395
case EBADF:
396
case ENOTTY:
397
return EX_UNAVAILABLE;
398
case EINVAL:
399
default:
400
return EX_OSERR;
401
}
195
perror("tcsetattr-echo");
196
return EXIT_FAILURE;
402
197
}
403
198
404
199
if(debug){
405
200
fprintf(stderr, "Waiting for input from stdin \n");
406
201
}
417
212
fprintf(stderr, "%s ", prefix);
418
213
}
419
214
{
420
const char *cryptsource = getenv("CRYPTTAB_SOURCE");
421
const char *crypttarget = getenv("CRYPTTAB_NAME");
422
/* Before cryptsetup 1.1.0~rc2 */
423
if(cryptsource == NULL){
424
cryptsource = getenv("cryptsource");
425
}
426
if(crypttarget == NULL){
427
crypttarget = getenv("crypttarget");
428
}
429
const char *const prompt1 = "Unlocking the disk";
430
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";
431
219
if(cryptsource == NULL){
432
220
if(crypttarget == NULL){
433
fprintf(stderr, "%s to unlock the disk: ", prompt2);
221
fprintf(stderr, "%s: ", prompt);
434
222
} else {
435
fprintf(stderr, "%s (%s)\n%s: ", prompt1, crypttarget,
436
prompt2);
223
fprintf(stderr, "%s (%s): ", prompt, crypttarget);
437
224
}
438
225
} else {
439
226
if(crypttarget == NULL){
440
fprintf(stderr, "%s %s\n%s: ", prompt1, cryptsource,
441
prompt2);
227
fprintf(stderr, "%s %s: ", prompt, cryptsource);
442
228
} else {
443
fprintf(stderr, "%s %s (%s)\n%s: ", prompt1, cryptsource,
444
crypttarget, prompt2);
229
fprintf(stderr, "%s %s (%s): ", prompt, cryptsource,
230
crypttarget);
445
231
}
446
232
}
447
233
}
448
sret = getline(&buffer, &n, stdin);
449
if(sret > 0){
234
ret = getline(&buffer, &n, stdin);
235
if(ret > 0){
450
236
status = EXIT_SUCCESS;
451
237
/* Make n = data size instead of allocated buffer size */
452
n = (size_t)sret;
238
n = (size_t)ret;
453
239
/* Strip final newline */
454
if(n > 0 and buffer[n-1] == '\n'){
240
if(n>0 and buffer[n-1] == '\n'){
455
241
buffer[n-1] = '\0'; /* not strictly necessary */
456
242
n--;
457
243
}
458
244
size_t written = 0;
459
245
while(written < n){
460
sret = write(STDOUT_FILENO, buffer + written, n - written);
461
if(sret < 0){
462
int e = errno;
463
error(0, errno, "write");
464
switch(e){
465
case EBADF:
466
case EFAULT:
467
case EINVAL:
468
case EFBIG:
469
case EIO:
470
case ENOSPC:
471
default:
472
status = EX_IOERR;
473
break;
474
case EINTR:
475
status = EXIT_FAILURE;
476
break;
477
}
478
break;
479
}
480
written += (size_t)sret;
481
}
482
sret = close(STDOUT_FILENO);
483
if(sret == -1){
484
int e = errno;
485
error(0, errno, "close");
486
switch(e){
487
case EBADF:
488
status = EX_OSFILE;
489
break;
490
case EIO:
491
default:
492
status = EX_IOERR;
493
break;
494
}
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;
495
253
}
496
254
break;
497
255
}
498
if(sret < 0){
499
int e = errno;
256
if(ret < 0){
500
257
if(errno != EINTR and not feof(stdin)){
501
error(0, errno, "getline");
502
switch(e){
503
case EBADF:
504
status = EX_UNAVAILABLE;
505
case EIO:
506
case EINVAL:
507
default:
508
status = EX_IOERR;
509
break;
510
}
258
perror("getline");
259
status = EXIT_FAILURE;
511
260
break;
512
261
}
513
262
}
514
/* if(sret == 0), then the only sensible thing to do is to retry
515
to read from stdin */
263
/* if(ret == 0), then the only sensible thing to do is to retry to
264
read from stdin */
516
265
fputc('\n', stderr);
517
266
if(debug and not quit_now){
518
267
/* If quit_now is nonzero, we were interrupted by a signal, and
527
276
fprintf(stderr, "Restoring terminal attributes\n");
528
277
}
529
278
if(tcsetattr(STDIN_FILENO, TCSAFLUSH, &t_old) != 0){
530
error(0, errno, "tcsetattr+echo");
279
perror("tcsetattr+echo");
531
280
}
532
281
533
282
if(quit_now){
535
284
old_action.sa_handler = SIG_DFL;
536
285
ret = sigaction(signal_received, &old_action, NULL);
537
286
if(ret == -1){
538
error(0, errno, "sigaction");
287
perror("sigaction");
539
288
}
540
289
raise(signal_received);
541
290
}
544
293
fprintf(stderr, "%s is exiting with status %d\n", argv[0],
545
294
status);
546
295
}
547
if(status == EXIT_SUCCESS or status == EX_OK){
296
if(status == EXIT_SUCCESS){
548
297
fputc('\n', stderr);
549
298
}
550
299
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